METHOD STATEMENTS FOR OFFSHORE PILING WORK OF ACCESS TRESTLE, COAL UNLOADING JETTY AND MOORING DOLPHIN

This method statement covers all construction aspects for offshore piling work for trestle, Coal unloading jetty and Mooring. This method statement deals with the followings Method for storage and transportation of piles to the working area. Method for connection of pile segments on barges Method for setting out of piles Method for lifting and driving of piles. Method for drilling of piles

GENERAL

INTRODUCE

The location of Van Phong 1 BOT Thermal Power Plant is chosen to be in Van Phong bay and contiguous to My Giang transshipment and petrol entrepot warehouse area

+ The length of trestle is about 1150m with the width of trestle is 12m; from axis 44 to axis

48 the width of trestle is 17m Above the trestle is technological trench with the width is 5m and from axis 44 to axis 48 is 10m

+ The dimension of coal unloading Jetty is: LxB = (297.5x27)m; crest elevation: +6.50m; bottom elevation: -18.31m

+ The dimensions of 02 mooring dolphin are: LxBxH = (12x12x2)m; crest elevation: +6.50m; bottom elevation: -18.31m

This document outlines the method statement for offshore piling operations related to the trestle, coal unloading jetty, and mooring at the Van Phong 1 BOT thermal power plant It details the processes involved in the storage, transportation, lifting, driving, and connection of all piles within the defined Scope of Work.

The piles are steel pipe piles installed by driving to the specified levels that are in accordance with approved specification and approved construction drawings

Figure 1-1 General view of Trestle and coal unloading jetty

Latest version of following documents will be referred to:

- General: From VP1-0-L4-C-UZN-05101 to VP1-0-L4-C-UZN-05103

- Drawings of Jetty: From VP1-0-L4-C-UZN-05104 to VP1-0-L4-C-UZN-05137

- Drawings of Trestle: From VP1-0-L4-C-UZN-05501 to VP1-0-L4-C-UZN-05526

- Part III-2 Exhibit B1 Tech Spec Section 8, item 8.7 Steel work

- Part III-2 Exhibit B1 Tech Spec Section 8, item 8.8.2 Piling

- Part III-2 Exhibit B1 Tech Spec Section 9, item 9.8 Piling

- QCVN 02 - 2009/BXD National technical regulation on data of natural conditions used in the construction;

- TCVN 10667:2014 About centrifugal concrete piles - Drilling and lowering piles - Construction and acceptance

- TCVN 9394:2012 About pile driving and piling - Construction and acceptance

- ASTM D1143: Standard Test Methods for Deep Foundations Under Static Axial Compressive Load

- ASTM D3689: Standard Test Methods for Deep Foundations Under Static Axial Tensile Load

- ASTM D3966: Standard Test Methods for Deep Foundations Under Lateral Load

- British Standard Code of Practice for Maritime Structures (BS 6349)

- AISC standard : American Institute of Steel Construction;

- JIS standard : Japanese Industrial Standards (Including OCDI and JRA Standard)

SCOPE OF WORK

This method statement covers all construction aspects for offshore piling work for trestle, Coal unloading jetty and Mooring This method statement deals with the followings

- Method for storage and transportation of piles to the working area

- Method for connection of pile segments

- Method for setting out of piles

- Method for lifting and driving of piles.

QUANTITY OF PILE

Summary quantity of offshore piles location of trestle is shown in the following table

No Items Quantity Diameter Thickness Length

Table 3-1 Quantities of pile location

SCHEDULE

Detail schedule shall be shown on Attachment – 02

CONSTRUCTION ORGANIZATION

MANPOWER AND EQUIPMENT MOBILIZATION PLAN FOR OFFSHORE PILING WORK

E QUIPMENT MOBILIZATION PLAN

Main equipment are shown on table as below:

No Type of equipment Technical data Name of equipment Description work

I Test Pile works and Mass pile for Trestle

1 Pile Driving Barge 1170T Phu Xuan 17 Driving Mass Pile

2 Diesel hammer 12.8T Driving Mass Pile

3 Crane on Barge 90T 1000T Phu Xuan 10 Support for pile driving work

4 Barge for load pile 1000T Truong Thanh

5 Tug boat 350CV Phu Xuan 03 Support for pile driving work

II Coal unloading jetty and Mooring Dolphin

1 Pile driving Barge 350T Phu Xuan 20 Driving Mass Pile

2 Diesel hammer 12.8T Driving Mass Pile

3 Barge for load pile 1000T Phu Xuan 07 Loading pile

4 Tug boat 650CV Hung Phu 39 Support for pile driving work

Table 6-1 List of equipment for piling work

M ANPOWER MOBILIZATION PLAN

No Description Unit Quantity Remark

1 Site manager Person 1 The manpower will be adjusted in accordance with the construction

Table 6-2 List of manpower for piling work

METHODOLOGY

P ILE PREPARATION

Piles production occurs at the manufacturer's facility, where all raw materials are rigorously tested according to established standards and procedures Throughout the production process, frequent in-process inspections ensure compliance with quality requirements Additionally, manufacturing records are meticulously updated and maintained until production is complete.

Steel pipe pile will be protected by cover painting which will be perform in factory of NPV coating

7.1.2 Stock piling and transportation of Piles for offshore pilling work

Steel pipe piles are fully manufactured at the factory and then transported to the site via barge To ensure safe transportation and prevent damage, lashing straps are applied, and wooden spacers are placed between the piles to avoid rotation and protect the paint from scratches during storage.

Before loading steel pipe piles onto the barge, they must undergo factory processing, and once they arrive at the construction site, their surfaces should be thoroughly inspected and accepted.

Upon receipt of the steel pipe piles from the supplier, the contractor must notify the owner and consultant to conduct an inspection of the piles' quality and specifications, including length, diameter, and thickness Any piles that fail to meet the technical requirements will be promptly rejected and removed from the construction site Conversely, all piles that comply with the specifications will be appropriately marked following the technical instructions.

The Manufacturer's Certificate must include detailed information of the pile as required by the Technical Instructions

The pile will be marked with paint to indicate its length, with a marking range of 10 cm for every 5 m of the pile head segment and 0.5 m for the remaining pile segment.

After being inspected by owner and owner’s engineer, the qualified piles shall be transported to the pile driving position

Figure 7-2 Diagram of pile inspection of the manufacture

+ The SSP shall stocked at storage barge

+ The pile segments shall be transferred from the transportation barge to the storage barge as shown in the diagram of pile loading below

Figure 7-3 Diagram of pile loading from the transportation barge to the storage barge

S ETTING OUT THE COORDINATE

7.2.1 Setting out the coordinate by GPS system:

The advanced GPS technology will be employed to precisely determine the pile locations before installation, ensuring accuracy for each driven pile Additionally, it will facilitate the verification and calculation of the pile's top elevation.

The position of pile will be surveyed following the below step:

The GPS fixed station will be established at the origin coordinates on the designated land area It is essential that this location is positioned within 15 degrees above the horizontal plane, ensuring minimal obstruction for optimal performance.

+ Secondly: Without any power full electromagnetic wave source within 200m

+ Thirdly: This place shall be in a higher location to ensure the GPS system can work efficiency

After establishing a fixed station, a mobile station can be configured using existing control benchmarks Parameters are transferred using a static method and then input into the GPS system By employing the Real Time Kinematic (RTK) operation method, the control reference point is calculated and compared with existing data to verify parameter accuracy The measurement sequence is as follows:

Deliver to site Pile Reject

Inspection by owner and conssultant

To accurately install a pile, it is essential to measure the distance between the main working point and the GPS location By considering the pile body slope ratio, the distance between pile centers, the elevation at the top of the pile, and the coordinates of the pile location, the precise positioning of the pile relative to the working point can be determined.

The pile elevation and set also can be controlled and calculated by GPS system

The contractor will conduct a survey to determine the location of the piles, specifically at the locating point and the cut-off pile head For this process, GPS technology will be utilized during floating pile driving to ensure accurate positioning Additionally, the survey team will verify the cut-off pile head's position using GPS measurements.

The achievable accuracy of GPS is 2cm

For the Raked pile with angle 

The rotation angle (γ) of a raked pile is calculated using the formula γ = arc tan(1/n), where n represents the slope of the pile body To mitigate the effects of angle deviation, tilt sensors are installed on the pile rack to accurately measure and correct the final angle The angle γ significantly influences the distance from the pile to the longitudinal axis of the pile ship; when slope angles are positive, they are considered as such, and negative when otherwise.

7.2.2 Setting out the coordinate by total station:

Using total station and gradient to determine coordinates, the elevation of the pile head and follow during the driving process

To ensure accurate placement of vertical piles, the pile's center must be determined using two total stations, which aim at the concave mirror positioned at the pile wall Throughout the pile driving process, it is essential to monitor the coordinates of the pile by utilizing multiple reference points along its axis.

Figure 7-5 Position of vertical pile

For the raked pile with the rotation angle:

The hammer rig, mounted on the pile driving barge, ensures that the barge's rotation directly corresponds to the pile's rotation To accurately position the center of the raked pile, two total stations are employed: one for locating and controlling the pile's center, and the other for adjusting the pile's rotation.

To adjust the rotation of the pile during driving, a fixed picket must be welded at the aft section of the pile driving barge, aligning it with the barge's longitudinal axis The distance from this picket to the hammer axis, or pile center, is a measured constant The coordinates of the picket are determined based on the design coordinates of each steel pile using AutoCAD, and this preparation should be completed in advance to ensure efficient pile driving progress.

The sequence of locating raked pile:

To accurately locate the center of the raked pile, Total Station 1 is utilized as detailed in the accompanying drawing Once the pile's center is established at the designated coordinates and rake angle, the pile driving barge is maneuvered using a six-winches system, rotating around the pile's center until the picket aligns with the direction of Total Station 2 Subsequently, the pile is rotated to the specified angle as required.

When rotating the pile driving barge around the pile's center axis, the pile may shift from its original coordinates To correct this, both total stations must be used to reposition the pile accurately Effective communication is essential during this process, utilizing a walkie-talkie system with an operational radius exceeding 1000 meters.

Figure 7-6 Position of raked pile

M OVING AND MOORING TOWER DRIVING BARGE TO PILLING LOCATION

Pile driving barge will be moved to piling location by using tug boat And then 06 anchors of barge will be dropped about 150m ~ 250m far from the barge as Figure below

Figure 7-7 Fixing barge by mooring

P ILE RIGGING AND HOISTING

In order to avoid the stress concentration while loading the piles, the cable must be arranged at 2 points as below:

Figure 7-8 Diagram of loading pile from storage barge to piling rig

The crane barge utilizes its winch and anchor system to maneuver backwards, creating sufficient space for the pile splicing barge to enter Once the area is clear, the winch system is employed to accurately position the barge in front of the pile driving barge.

The winch system on the pile driving barge is utilized to transfer piles from the carrying barge to the hammer rig, positioning them close to the rig Concurrently, the winch system returns the pile carrying barge to its original location Once in place, the hammer is lowered onto the pile head, and workers secure the pile to the trestle shaft using a shackle Subsequently, the rake of the pile driving barge is adjusted to align with the designed specifications, particularly for raked pile driving This entire process of pile erection is executed by the pile driving barge, adhering to the specific fabrication requirements.

When hoisting steel pipe piles from a transport barge to a stockpile barge and subsequently to a piling rig, it is essential to load the piles from the center towards both sides of the stockpile barge The unloading sequence on the floating barge should mirror the loading process to ensure stability and safety during operations.

S ELECT THE HAMMER

Pilling hammer is selected based on analyzing results from the pile load test

The driving operation will utilize a 12.8T single-acting diesel hammer, designed to prevent damage to the piles It is crucial to monitor and control the driving process to avoid excessive tensile stresses on the piles To establish safe driving criteria and prevent damage, dynamic pile testing equipment will be employed.

PILE DRIVING FOR ACCESS TRESTLE AND COAL JETTY

G ENERAL FOR PILE DRIVING

Figure 8-1 Sequence of pile driving

Figure 8-2 Direction of pile driving for Access Trestle

Figure 8-3 Direction of pile driving for Mooring Dolphin and Jetty

Drawing of construction method for piling work are shown in “Attachment 02: Drawing of pile driving method statement”

D RIVING PILE

Process of driving pile as below:

Moving the driving barge to piling location

The pile shall be attached to lead system by 02 clamps After that, releasing the lower shackle

Figure 8-4 Installing the pile clamp

To properly install the D1000 steel pipe pile according to design specifications, adjust the driving rig accordingly Lower the pile slowly using the winch to ensure it is fully settled before driving Once settled, gradually increase the energy applied to the pile until the required design energy is achieved.

Use diesel hammer 12.8T to drive the steel pipe pile D1000

To ensure precise pile head elevation during driving work, utilize a level machine for control Mark the pile head elevation by painting, and monitor the painted line until it aligns with the level machine's indicator, at which point you should stop the operation.

Pile driving work is stopped when the actual rebounded is less than or equal to the design rebound

During piling work the actual rebound will be check by following methods:

- Check rebound by total station or level machine:

The rebound paper will be installed to the pile head and using total station or leveler to check the penetration after 10 blows

Figure 8-5 Check rebound by total station or level machine

The rebound paper will be positioned at the pile head, with a pencil secured to a steel bar attached to the piling rig The rebound measurement is calculated as the average of the last 10 blows.

Figure 8-6 Check rebound by hand

 Step 3: Splicing pile and continue driving pile

Pile splicing work is carried out in following cases:

- Actual rebound is similar or smaller than design rebound and pile head level is lower than design level

When the drive pile head reaches the operational limit of the piling equipment and is positioned at least 3.0 meters above the designated level, but the actual rebound exceeds the design specifications, it is necessary to splice an additional segment to the main steel pipe pile fabricated at the factory The driving process should continue until the actual rebound aligns with or falls below the design rebound criteria.

Pile splicing work can only commence when specific conditions are met: the axis of the pile segment must be corrected in at least two directions, the axis of the second pile segment must align with the axis of the first, and the surfaces of the two pile heads must make tight contact with one another.

Method of pile connection as shown in figure below:

Figure 8-7: Steps of pile splicing

Preparation work includes: Preparation of equipment, manpower, pile materials and joint welding materials

+ Equipment: Crawler crane, generator, welding machine, welding kits, gas , oxygen , cutting machine, grinding blades, cinder cleaning brush, levelling instrument

+ Manpower: Foreman, barge operator, welders, workers (Certificated of welder as shown on

+ Welding procedure specification (WPS) is shown on Attachment 04

The project utilizes SPP piles and joint welding materials, as outlined in Table 3.1, to ensure that the pile heads achieve the designated design level However, it has been observed that the actual rebound exceeds the anticipated design rebound The welding wire employed in this process is Hyundai SF-71, which is certified as per the specifications detailed in Attachment 05.

- Cleaning the pile head prior to welding

The workers will use a grinding machine to clean the entire flange of 2 pile segments;

- Locating the pile prior to welding

The workers will locate 2 pile heads and fixing 02 pile segment by steel plate

- Welding to join the pile segments

+ The workers will perform measures to stop the winds during welding process

+ The welders will perform welding when the pre-welding heating temperature is excessive of the minimum rate of 20°C

+ While carrying out welding, the foreman will control the welding temperature so as not to exceed the limit of 200°C

Welders will perform multi-layer welding, specifically three layers, ensuring meticulous control over each layer Throughout the welding process, they will utilize a grinding machine and brush to remove slag and clean the joints to meet quality standards before advancing to the next layer This careful approach continues until the welding is fully completed.

After finishing driving pile, bracing derived pile head by I steel system

To prevent oil spills during pile driving, a buoy guard will be installed around the piling area to contain any oil leakage and prevent it from spreading into the sea Additionally, specialized chemicals or oil absorbent paper will be utilized to effectively manage any oil spills that may occur from the hammer.

COMPLETION WORK

B RACING DERIVED PILE HEAD

After completing the driving of piles, it is essential to brace the head of the derived piles using an I steel system, ensuring a minimum of three piles per group This bracing is crucial to prevent oscillation of the pile head caused by waves or currents.

- Step 1: Install bracing support (clamp)

The elements of bracing system shall be constructed by crawler crane stand on barge with support of chain tackle and workers

The supports are pre-fabricated steel structures made of two halves of a round pipe with a diameter of 1.00m, secured to the pile shaft using eight M22 bolts Each support features a rubber washer installed internally, and two I300 beam brackets are symmetrically welded to the exterior The installation of the supports ensures that the I300 beam brackets are positioned perpendicular to the edge of the coal unloading jetty.

Along with the pile, two rows of I300 beam be installed parallels and placed on I300 beam brackets

Figure 9-1 Detail of pile head bracing for Jetty

Figure 9-2 Detail of bracing supporting (clamp)

To enhance safety, all head piles will be covered with plywood plates, preventing accidental falls into the steel pile holes The plywood covering is securely attached to the pile head using plywood panels that are fixed beneath the covering and inside the pile.

PDA (P ILE D YNAMIC A NALYZER ) TEST PILE

Due to Test pile work No VP1-0-L4-C-UZR-05700, Quantity of PDA test shall be carry as mention in table as below:

No Items Quantity Diameter Thickness

Table 9-1 Quantity of PDA test

P ILE HEAD TREATMENT

- Determination of pile cut-off elevation

+ Prior to the construction of pile head cut-off, the contractor shall use a level machine to determine the elevation of the pile cap

+ The pile head cut-off

To ensure precise pile cut-off elevation, the contractor must clearly mark and indicate the cut plan elevation based on the outer circumference of the pile.

- Construction of pile head cut-off shall be conducted by skilled workers Workers will cut around the outside diameter of the pile by heat cutting according to the marking

During the pile head cut-off construction, it is essential to use a crane on the barge to securely hold the upper part of the pile with a hook and cable This setup ensures stability at the pile head while a rope is utilized at the bottom of the upper section to prevent any accidental hitching that could endanger workers.

- After completion of pile head cut-off by heat cutting the cutting surface shall be grinding by grinding machine Elevation and flatness of the pile head shall be rechecked

If the piling work is completed but the pile head level is below the design level, an additional pile segment of appropriate length will be spliced to the existing pile This pile splicing procedure follows the guidelines outlined in Section 8.2 – Step 3.

REPAIR AND TOUCH-UP PROCEDURE

S URFACE PREPARATION

High-pressure fresh water cleaning effectively eliminates salt, dirt, and other contaminants from surfaces It is essential to remove any oil and grease contamination following SSPC-SP1 standards before proceeding with surface preparation.

For damaged areas up to 100mm down to bare metal, perform mechanical cleaning to at least St.3 according to ISO 8501-1:2007 standards Use disc sanders or 3M strip clean products for this process, as wire brushes are not suitable; they can polish the surface and weaken the mechanical bond of the coating system.

Feather edge the adjacent to sound coating to ensure coating overlapping continuity

Remove all surface contaminants dust, from the entire prepared surfaces including intact coating adjacent to the prepared areas

Care shall be taken to avoid contaminating prepared surfaces with fingertips or from impurities on worker clothing and/ or shoes

Surface preparation must be completed in areas that can be effectively coated with primer to prevent re-oxidation It is crucial to avoid any visible oxidation or condensation on the surface before applying the coating To ensure optimal conditions, the surface temperature should be maintained at least 30°C above the dew point to prevent oxidation.

On damaged areas over 100mm to bare metal, carry out surface preparation as main specification

Superficial coating damage not to bare metal, prepare by means of sand paper.

P AINTING APPLICATION

Brush application is acceptable only for touch-up but using airless spray equipment to be preferred

Paint mixing shall always be carried using mechanical means to ensure proper mixing of two components paint

It is not allowed to mix paint by hand

Overlap of painting at least 50mm on surface of 02 painting times

Recoating intervals shall be strictly followed in accordance with indications on the relevant product data sheets.

QUALITY CONTROL

Q UALITY C ONTROL OF M ATERIALS

Piles, welding electrodes, and other consumable materials are purchased in accordance with the approval documentations but not limited to the following:

- Manufacturer’s certificate of production and tests

- Materials endorsement for approved usage

- Material storage and control procedure

Q UALITY C ONTROL OF M ATERIALS HANDLING & D ELIVERIES

- Acknowledgment on the materials to be delivered

- Piles will be mark to make it easy identification for survey works

- All handling points use for lifting materials will be checked by competent site supervisor.

Q UALITY C ONTROL OF M ATERIALS S TORAGE

- Materials shall be laid down on horizontal position and ensure that the piles are secured against rolling

- Not allowed the materials stacked on top of each other

- Marked every Piles accordingly to avoid any mistake in type, length, segments

- Consumable welding materials shall be stored according to Material storage and control procedure

Q UALITY C ONTROL OF P ILE D RIVING P ROCESS

The Inspection and Test Plan for pile driving and testing outlines essential characteristics to be verified during the process The Site Engineer is tasked with ensuring compliance at each stage of the operation, while the Site QAQC Engineer conducts quality control checks and documents the inspection findings.

Joint welding must adhere to the specified technical processes, and upon completion, each welded joint should be meticulously inspected to ensure it is free of defects.

The joint welding shall be carried out by the qualified and experienced welders which have been approved by the Engineer before inspection of their testing welds

All welded joint of pile shall be tested by Ultra sonic test (UT) in accordance with ASTM E164 will be applied for quality

Welding method shall comply with the basic requirements of the technical instructions and respective standards

Joint individual pile lengths into the full lengths so that pile driving can be done by full penetration grooved butt welds

Electrodes for welding shall be compatible with the grade of steel to be welded and produce a weld equivalent in strength to the parent metal of the tubular steel pile

Surfaces to be welded shall be dry, free from rust, loose scale, grease and paint

Particular care shall be taken to ensure the smoothness of finished welds, which shall be smooth and flush with the adjoining surfaces of the metal

Welding sequences shall be such that distortion is reduced to a minimum, and local distortion is rendered negligible in the finished work

Each pile shall be accurately installed in the position shown on Contractor’s Construction Drawings

Forcible corrections to the position or rake of piles shall not be made unless approved in writing by Owner’s Engineer/Owner

The following table provides standard installation tolerances for piles

Plan position for piles at design elevation of top of the pile Not more than 150mm

Inclination of the vertical pile and raked pile under 5:1 2%

Table 11-1 Standard installation tolerances a) Controlling of pile’s coordinates

During the pile driving construction process, the contractor utilizes theodolites and the long-base angular method to accurately control the center of the piles Additionally, they ensure precise management of the pile's top elevation for optimal results.

Upon the completion of the working platforms, the Sub-Contractor will assess the elevation of the shaped beam within the bracing system This evaluation will allow for the determination of the distance from the working platform to the top of the designated pile.

The Contractor will apply red paint to mark 5 cm vertical scale-division dashes along the Hammer body, serving as indicators for monitoring progress in subsequent stages These red markings will signal when to stop driving the pile upon reaching the desired top elevation.

During the execution of the piling works and testing The competent supervisor shall make sure that the documents listed here below are prepared and properly filled up

Proper support must be ensured for the pile section, with all welding performed in compliance with AWS D1.1 and D1.1M standards The acceptance criteria for weld quality on-site will be consistent with those applied to shop welds.

When selecting electrodes for welding, it is essential to ensure compatibility with the specific grade of steel being welded The chosen electrodes must also produce a weld that matches the strength of the parent metal in the tubular steel casting.

ENVIRONMENT , HEALTH AND SAFETY ORGANIZATION

G ENERAL S AFETY P ROCEDURES

The contractor must adhere to all relevant statutory regulations and safety procedures to protect shipping operations, public welfare, personnel, and equipment This includes strict compliance with established rules for the proper mooring and anchoring of vessels to ensure safe practices.

When crossing between vessels, it is crucial to follow safe procedures and use only well-constructed and secure gangways Additionally, all open sides of barges and pontoons at risk of falls will be equipped with safety railings or barricades to enhance safety.

All necessary navigational warning systems, marker buoys and other facilities will be correctly installed in accordance with the relevant regulations and will be properly maintained

12.1.2 Inspection of life-saving and safety equipment

The captain must regularly organize an inspection of all life-saving and safety equipment, according to the list contained in the safety plan, and take corrective action as appropriate

During this inspection, the following equipment must be checked at least once month

 Safety lamp, signal lamps, etc …

 All life rafts and lifeboats and the equipment mentioned on the inventory list; engines of motor lifeboats must be in good working order

 All lifebuoys and attachment, e.g flares and smock signal, etc…

 Navigation lights, signaling lights, etc…

All navigational warning systems, marker buoys, and related facilities will be installed and maintained in compliance with applicable regulations Only authorized and qualified personnel will operate the winches during piling operations.

During pilling operations, all workers will be stationed at their designated work areas, equipped with protective clothing and safety gear, ensuring they are thoroughly informed about its proper use Additionally, all barges involved in the pilling work will be securely moored to prevent drifting and will remain in designated mooring areas to avoid interfering with other vessels in the vicinity.

To ensure safety at workplaces near water, all areas with a fall risk will be equipped with guardrails Additionally, lifebuoys attached to a sufficiently long buoyant rope will be strategically placed at regular intervals along the water's edge.

At the commencement of working shift the area will be checked to ensure that lifebuoys are in position and that the ropes are in satisfactory condition

To ensure safety, the platform must remain free of unnecessary materials, with clear passageways maintained at all times A rescue boat will be available if needed, equipped with spare life jackets, lifebuoys, ropes, and fitted with spotlights for nighttime operations.

S ITE S ITUATION R ESPONSE AND E MERGENCY R ESPONSE

Before starting the work, the Subcontractor must assess and report on the condition of existing houses, waste materials, farms, and any cultivation activities to the Contractor and relevant local authorities.

The VP1 initiative aims for zero incidents and accidents to ensure the safety and well-being of individuals Any incident detected on-site must be promptly reported to the EHS officer and manager While it is acknowledged that incidents may happen, management is committed to investigating each occurrence and issuing a report The ultimate goal remains clear: to achieve zero harm to people and prevent future incidents.

In the event of an incident or accident, the reporting line follows this sequence: EHS officer and manager, then the site manager, and finally the owner For minor accidents occurring in the field, a medical kit is readily available in the container field office However, for injuries that exceed normal severity, affected individuals are directed to the appropriate hospital based on the severity of the incident.

Emergency DHI contractor EHS MANAGER DHI

Ms Pham Thi Phuong Thoai:

VP1 TPP Project site First Aid Team

When an incident/ accident happened, witness or injured person should call

- Nature of injury, victim conscious

Note: If Site Manager is not present at site, The emergency coordinator will take role place as controller

Figure 12-1 Emergency response flow chart

ATTACHMENT

 ATTACHMENT 01: DRAWING OF MS FOR PILE DRIVING

 ATTACHMENT 02: SCHEDULE OF PILLING WORK

 ATTACHMENT 04: PERSONEL FOR PILE JOINT WELDING

 ATTACHMENT 05: CERTIFICATION OF WELDING WIRE SF-71

 ATTACHMENT 06: COUNTERMEASURE TO PREVENT OIL LEAKS DURING DRIVING PILES

 ATTACHMENT 08: EXPERIENCE PERSONNEL FOR PILING WORKS

15 5.1 Fabrication Precast Pile Caps, Fender Beams, Beams and

20 5.2 Construction of Pile Foundation 193 days 5/4/20 11/12/20

22 5.2.1.1 Test pile for Trestle 40 days 5/7/20 6/15/20

27 5.2.1.2 Test pile for Coal Jetty 17 days 5/4/20 5/20/20

32 5.2.2 Fabrication and Delivery Piles Works 150 days 6/16/20 11/12/20

33 5.2.2.1 Fabrication of Steel Pipe Pile Pile 630 120 days 6/16/20 10/13/20

34 5.2.2.2 Delivery Steel Pipe Pile from Factory to Site Pile 630 135 days 7/1/20 11/12/20

35 5.2.3 Pile Driving for Mass Piles 112 days 7/1/20 10/20/20

36 5.2.3.1 Pile Driving for Jetty Trestle Pile 259 112 days 7/1/20 10/20/20

37 5.2.3.2 Pile Driving for Coal Jetty Pile 371 62 days 8/20/20 10/20/20

39 5.3.1 Construction Axis 24 to Axis 97 211 days 7/26/20 2/21/21

73 5.5 Construction of Accessory Installation 105 days 6/30/21 10/12/21

88 7 Approval of Permit for Navigation and Operation 60 days 11/1/21 12/30/21

Duration-only Manual Summary Rollup

ATTACHMENT – 3 at Risk Adverse Effect Mobilization of equipment & personel

Mobilization of Personal Site personnel

'- Lack of training to workers

'- Fatality, serious injuries, property damage scope of works 4 4 16

All personnel must undergo mandatory training, including induction, working over water, and confined space protocols, along with any other job-specific training Adherence to project PPE regulations is essential, and life jackets must be equipped with high visibility strips and waterproof features for safety.

Mobilization of equipment Site personnel

'- Not inspection equipment before mobilized to the site by DHI's EHS department

- Lack inspection by third party

'- Fatality, serious injuries, property damagescope of works

All equipment must undergo inspection and approval by DOOSAN, along with obtaining third-party certification Additionally, marine equipment requires work permit approval from the relevant authority It is essential to have a banksman to manage the movement of plants and equipment, and to conduct toolbox talks and START meetings to address hazards and controls Finally, ensure that only trained operators handle the plants and equipment.

'- Person falls down into water during boarding

'- Life Vest shall be worn at all time during the Work

- Any personnel is not allowed to carry-out the work alone, partner system is complusory

- Daily Toolbox meeting" outlining the task and hazards of drowning and falling into the sea shall be made

- Working tools and equipment falls down into water during bringing on- board

'-Never carry heavy load on-board manually Heavy equipment such as drilling rig shall be transferred on-board by crane or other appropriate means

- If necessary, use a safe gangway with guardrails during transfering

Towing Equipment and pipe to pile Driving are

'- Out of control speed in navigation area

'- Collision with other vessels on the channel

'- Schedule of vessels navigating on the channel will be updated regularly.

- The towing boat's operator shall be aware of the risk of collision whenever towing in high density marine traffic

- Towing in foggy weather will be prohibited Only allowed whenever vision is clear

- When need to cross of other vessel, cross behind it, not in front of

'- Person and/or equipment falls down into water during towing

'- Life Vest shall be worn at all time during the Work

- During towing, everybody shall stay on towing boat, VHF shall be use all time

- Tools and equipment which is kept on barge shall be lashing tightly and clearly

'- Lacking of lifting & rigging's training

- Lacking of provide of communication equipment

'- Finger caught between object during pile loading and unloading.

'- Assign trained signal man and riggers.

- Wear leather gloves and PPE 2 1 2

'- Not checking of Lifting equipment before start the work

- Not provide of hard barricade

'- Struck by falling object during lifting:

'- Check lifting gear before working

- Assign trained signal man and riggers.

- Before starting works Tool box meeting and TBM are to be - carried out to remind risk of this works

- Conduct a routine visual inspection on lifting gear and material condition

- Checking the safety radius before lifting

- Keep the gap between piles.

Control measures will be regularly reviewed and monitored to assess their suitability and improvements made if required

Any modifications to working conditions or operations, such as changes in sequencing, the introduction of new plant or equipment, or the involvement of new workers, will necessitate a new risk assessment Subsequently, additional control measures will be implemented to align with the updated operation.

RRN >6 for this activity therefore a Job Safety and Environmental Analysis (JSEA) shall be conducted.

Any modifications to working conditions or operations—such as changes in sequencing, the introduction of new equipment, or the involvement of new workers—will necessitate a new risk assessment, followed by the implementation of additional control measures tailored to the specific operation.

Any modifications to working conditions or operations, such as changes in sequencing, the introduction of new equipment, or the involvement of new workers, will trigger a new risk assessment This assessment will ensure that appropriate control measures are implemented to align with the updated operations.

Getting on-board Site personnel

Moving to the site at Risk Adverse Effect

'- Worker/s Fall down overboard and Drowned

'- Provide/wear for personnel working near the water edge with life Jacket

- Avoid any kind of Jokes threatening Worker/s to fall down and drowning during the work

- Regular safety reminder, advised, warning, notice, instruction during the work

- Worker/s under influence of liquor is prohibited to do the work

- Bad weather '- Not compliance with lifting plan

- Not re-inspection lifting equipment before start the work

- Not conduct TBM before start the work

'-Make sure that the crane's foot is placed / standing on the stable ground

Follow proper lifting plan Toolbox Meeting before lifting work Everyone involved in lifting activity must go through training.

Check the color code of the lifting gear Operators and signalman must unity signals and use them expertly.

Crane operator must be well familiar with his Crane Load Chart lifting capacity.

- Lack of provide of communication equipment

'- Capsized flat barge hit with driven pile and other obstacle and landing and seabed.

'- Conduct TBM to remaind hazard.

Provide communication tools (HF) and make good comunication and assign trained signal man.

Provide proper plan with close monitoring by supervisor.

Wear enuugh PPE required all the time 1 2 2

- No have handrail around the barge

'- Person hit by object, Failure of winch wire or mooring rope

'- Conduct toolbox meeting to remind hazard on the risk of this work

- Conduct a routine inspection of mooring rope and winch

- Do not stand in snapback zone

- Conduct a routine inspection of mooring rope and winch.

- Lack of provide of communication equipment

'- Capsized flat barge hit with driven pile and other obstacle and landing on seabed.

- Conduct TBM to remaind hazard.

- Provide communication tools (HF) and make good comunication and assign trained signal man.

- Provide proper plan with close monitoring by supervisor.

- Wear enough PPE required all the time 2 2 4

'- Person hit by capsized piling barge, OverLoad Unstable Condition

'- Conduct toolbox meeting to remind hazard on the risk of this work

- Conduct a routine inspection of mooring rope and winch

- Do not stand in snapback zone

- Conduct a routine inspection of mooring rope and winch.

- Assign trained signal man and riggers.

- Conduct toolbox meeting to remind hazard on overloading

- Checking the safety radius before lifting, water condition, wind, lifting gear.

- Control ballast water of barge and keep good stability Assign trained signal man and riggers

Pile unloading from flat barge to crane barge

Flat barge positioned to in front of piling barge

Anchoring of piling barge at Risk Adverse Effect

- Collisions between people and plant

'-Struck by falling object during lifting:

'- Before starting works Tool box meeting and TBM are to be carried out to remind risk of this works.

- Collisions between people and equipment

Finger caught between object during pile loading and unloading

'- Assign trained signal man and riggers.

- Wear leather gloves and PPE

'Provide/wear for personnel working near the water edge with life Jacket

Avoid any kind of Jokes threatening Worker/s to fall down and drowning during the work

Regular safety reminder, advised, warning, notice, instruction during the work

Worker/s under influence of liquor is prohibited to do the work

Slotting of pile into the hammer cap at Risk Adverse Effect

'- Not conduct TBM before start the work

'- Falling from height during checking the hammer head condition.

'- Provide the barricade and/or use safety harness

- Conduct toolbox meeting to remind hazard on the risk of this work.

- Provide communication tools(radio etc.) or make good communication 1 1 1

'- Person hit by capsized piling barge,OverLoad Unstable Condition

- Segregation of working area while lifting in progress

- Only competent authorized persons with the relevant certificates and license, to operate machinery and conduct lifting operations

- All lifting operations to have a banksman at all times

- Warning signage displayed notifying of lifting operations

- Regular inspections and maintenance of equipment undertaken by competent persons

- Records and registers of all equipment to be maintained on site

- Suitable and sufficient training given to all operatives

- Lifting plan to be developed and distributed to relevant parties

- PPE shall be worn at all times

- Full implementation 333 for Safety for lifting operation:

- Use of green lifting rard by all rigger prior start of any normal lifting operation

- No person shall be on the load during lifting operation

- In case of critical lift mandatory supervision of Subcontractor Safety, Doosan Construction Manager, and Doosan EHS representative

'-Struck by falling object during lifting:

'- Before starting works Tool box meeting and TBM are to be carried out to remind risk of this works

'- Ear Injury during percussion the pile by "Loud Noise"

'- Conduct toolbox meeting to remind hazard on the risk of this work.

- Provide proper PPE/ Ear plug

'- Provide/wear for personnel working near the water edge with life Jacket

- Avoid any kind of Jokes threatening Worker/s to fall down and drowning during the work

- Regular safety reminder, advised, warning, notice, instruction during the work

- Worker/s under influence of liquor is prohibited to do the work

Pile Driving Work at Risk Adverse Effect

'- Not compliance with lifting plan

- Not re-inspection lifting equipment before start the work

'- Make sure that the crane's foot is placed / standing on the stable ground

- Toolbox Meeting before lifting work

- Everyone involved in lifting activity must go through training.

- Check the color code of the lifting gear

- Operators and signalman must unity signals and use them expertly.

- Crane operator must be well familiar with his Crane Load Chart lifting capacity.

'- Equipment disordered, sliding while assembling to hit people

'- Falling objects piles drop and hit to people nearby resulted in fatality or serious injuries

'- Site Supervisor must always at site to remind and guide to work safely.Use proper tools and equipment.

'- wear safety belt/harness, use proper access, keep workplace clear of obstructed objects

Chain block released; mis-alignment

Chains or linners fly to hit people - resulted in head impact and body injuries - Seriuos injuries, medical treatment 1 2 2

When adjusting pipes, ensure that no one stands too close and avoid being positioned at tension points of chains and adjusting devices Always inspect equipment before beginning daily tasks and promptly remove or replace any damaged tools Steer clear of blocked areas and avoid working between piles It is essential to have a competent supervisor overseeing the work for safety and efficiency.

Finger cut - medical treatment, first aids 3 3 9

'- Need to conduct START and need to make sure all hazreds related with activity communicate to workers clearly 2 1 2

Welding, grinding, cutting - Eyes injuries, skin burn

Seriuos injuries - medical treatment, first aids

'- Wear proper PPE for hot hot works (long sleave leather gloves, clear faceshield for grinding; welding hard Burn prevention cloths 2 1 2

'- Oxygen/accetelene cylinder need to put cylinder storage area after use.Remove flammable materials away from hot work.Ensure good housekeeping.Ensure sufficient portable fire extinguishers at working areas.

Any modifications to working conditions or operations, such as changes in sequencing, the introduction of new equipment, or the involvement of new personnel, will necessitate a fresh risk assessment Subsequently, additional control measures will be implemented to align with the updated operational requirements.

Others at Risk Adverse Effect

Cut-off pile head hit to the workers

During the pile head cut-off construction, a crane must be positioned on the barge to securely hold the upper section of the pile using a hook and cable, ensuring stability Additionally, a rope should be attached to the bottom of the upper part to prevent any accidental entanglement with workers.

'- Lacking of harness '- Lacking of cover protection

'- Falling down into the hole of SPP

'- All head pile will be cover by plywood plate to prevent people falling down into the hole of steel pile.

- Safety harness must be worn during the work

'- Falling down into the water

'- Life vest must be worn during the work

- Safety harness must be worn during the work

Community Sea water undersea creature

'- During pile driving, oil of diesel hammer fall down to the sea

'- Check, clean the hammer and auxiliary equipment to avoid sticking to oil and lubricant before driving pile.

- Use lubricating grease instead of lubricating oil at locations where lubrication is required on hammers and hammer auxiliary equipment.

- In the process of driving piles, contractors regularly check with check list (daily) and monitor to promptly handle the environmental problems that arise.

- Track hammer activity during pile driving to detect early any risks of oil leakage.

Before initiating pile driving operations, the contractor will provide comprehensive training for engineers, safety personnel, workers, and operators involved in offshore work This training will focus on essential countermeasures to prevent oil leaks during the pile driving process, ensuring safety and environmental protection.

'- During driving pile, a buoy guard anti leaking oil will be installed around piling area to ensure collect oil spread to the sea in case of oil spill

'- Regular maintenance and changed Oil

- Turn off the engine when standby 1 2 2

'- Excess garbage (like plastic, steel, glass, oil, etc ) that could be detrimental to water pollution should be properly put in trash bin/boxes for proper disposal.

- Throwing of excess garbage in the water is strictly prohibited (forewarn workers regularly and install signages/warning sign).

- Food leftover containing plastics (styrofoam) and biodegradable should be segregated in a separate container (trash box/plastic).

Any modifications to working conditions or operations, such as changes in sequencing, the introduction of new plant or equipment, or the involvement of new workers, will necessitate a new risk assessment Subsequently, appropriate control measures will be implemented to align with the updated operational requirements.

Any modifications to working conditions or operations, such as changes in sequencing, the introduction of new plant or equipment, or the involvement of new workers, will necessitate a new risk assessment This assessment will lead to the implementation of additional control measures tailored to the specific operation.

Others at Risk Adverse Effect

'- Provide separate storage/disposal of excess wooden block/cut steel rebar/ construction debris.

- Remove and disposed excess concrete debris after every concrete casting.

- Practice Regular Housekeeping in the working area.

- Electrical equipment register containing all electrical equipment on site as well as relevant documentation

- Temporary power supply, portable electrical tools, cables will be tested and inspected every three months by competent persons, and tagged to certifying it is safe for use

- All defective items reported immediately, if defect renders equipment unsafe to use it will be removed from site until repaired

- Double insulated cables to be used on hand held tools

- All cable routes shall be designated so that to not obstructed access/egress walkways

- PPE must be worn at all times

- Use of industrial plug 44 for all power tools at site

'- Generation of noise and vibration

- Generation of hazardous dust from wood saw and concrete grinding

'- Effect on health due to noise and vibration

- Effect on health due to hazardous dust emission into air

'- Control of noise and vibration through inspection of tools and equipment before entering to site

- Segregation of wood cutting area from other activities

- Control of concrete dust by using dust suckers

- Use of appropriate PPE (ear plug respiratory protection)

- Only competent persons authorized to work

- Supervision of work by competent person

- Atmospheric monitoring used to monitor environment

- Development of suitable and sufficient emergency procedures

- Confined space signages, warning and contact numbers posted on the access / egress of confined space

- Proper lighting illumination on work areas (if needed)

- Forced mechanical ventilation on confined space (if needed)

- Any kind of cylinder not allowed inside a confined space

- Uncontrolled access to confined spaces

- Strict control of confined space entry access

- Adherence to all precautions of Permit to Work

- Physical barriers to restrict unauthorized entry

- Medical and health surveillance initiated where necessary

- Designation of qualified and certified hole watchman on access / egress of confined space

Any modifications to working conditions or operations, such as changes in sequencing, the introduction of new equipment, or the involvement of new workers, will necessitate a new risk assessment This assessment will ensure that appropriate control measures are implemented to align with the updated operations.

Use of electrical tools - Drills,

Any modifications to working conditions or operations, such as changes in sequencing, the introduction of new plants or equipment, or the involvement of new workers, will necessitate a new risk assessment This assessment will lead to the implementation of additional control measures tailored to the specific operations.

- Life provisions located within the area

- Work undertaken and supervised by competent persons

- Development of emergency rescue procedures

- Emergency safety boat provided with trained operator

- Inspections of all equipment before entering to site to ensure no oil leakage or spill

- Emergency oil spill kits and oil barriers shall be available at location

- Oil screens shall be installed on all discharge points of storm water channel

- Safe working area provided with the following hierarchy of fall protection in place:

To ensure safety in the workplace, it is essential to provide properly constructed working platforms equipped with toe boards and guardrails, which must be erected, inspected, and approved by competent individuals When feasible, collective fall protection measures such as guard rails, nets, or bags should be implemented and regularly inspected by qualified personnel If collective measures are impractical, individual fall protection systems, including harnesses, lanyards, or inertia reels, must be utilized Ladders and step ladders should only be considered as a last resort when none of the other safety options are applicable.

- Only competent people authorized to working at height

- Only competent authorized persons allowed to erect any working at height equipment

- Regular inspections of working at height equipment to be undertaken by competent persons

- Segregation of area below using signage and barriers warning of restricted access

- PPE must be worn at all times

- Practice 100% tie-off when working at height

- Installation of canopy specially on the access way

- Effect on people health due to dust emission into air

- Effect on people health due to excessive noise

- Exposure of general public to the work areas

- Control of dust emissions through regular water sprays

- Control of noise through strict inspection of all equipment before entering to site and provision of acoustic barriers where noise exceeds the allowable limits

- Establishing fence and security system to restrict the unauthorized entry to work site

Any modifications to working conditions or operations, such as changes in sequencing, the introduction of new equipment, or the involvement of new workers, will necessitate a new risk assessment This assessment will lead to the implementation of additional control measures tailored to the specific operations.

Tiêu đề	Method Statements For Offshore Piling Work Of Access Trestle, Coal Unloading Jetty And Mooring Dolphin
Trường học	Van Phong 1 BOT Thermal Power Plant Project
Thể loại	for approval
Năm xuất bản	2020

Định dạng
Số trang	114
Dung lượng	11,27 MB