GRBCC MS CIPCP a2 EN

Noi Bai-Lao Cai Highway Construction Project Package A7: Km190+420 ~Km 218+040 Contractor: GRBCC Method Statement for Cast-in-place Concrete Pile GRBCC-MS-CIPCP-A2-EN Contents General - Quantity of Work - 3 Schedule of Work - 4 Site Organization - Equipment and Workforce 5.1 Bored Pile Work 5.2 Grouting Sonic Tube 5.3 Pile Head Treatment - 5 Materials 6.1 Bored Pile Work 6.2 Grouting Sonic Tube - 8 Construction Procedure 7.1 Bored Pile Work 7.2 Grouting Sonic Tube 7.3 Pile Head Treatment - 20 21 Quality Control - 22 Safety Control - 23 10 Environmental Control - 24 Appendixes Construction Schedule Drawing of Hanging Bar Inspection and Testing Plan Check Sheet -03 pages (A3 size) 01 page (A3 size) -03 pages (A4 size) -30 pages (A4 size) (Total 67 pages) Noi Bai-Lao Cai Highway Construction Project Package A7: Km190+420 ~Km 218+040 Contractor: GRBCC Method Statement for Cast-in-place Concrete Pile GRBCC-MS-CIPCP-A2-EN General This method statement describes the construction procedure and quality control aspects of Cast-InPlace Concrete Pile construction in accordance with General Specifications section 06210 Proposal of sub-contractor will be submitted separately The working drawing will be submitted after receipt of final design of Bored Pile such as length and location of pile This method statement contains Bored Pile Work (drilling ~ reinforcement ~ casting concrete), Pile Head Treatment and Grouting Sonic Tube, except the description of Sonic Test and Static Load Test Quantity of Work The estimated quantity is as followings Below quantity is only reference Final quantity shall be calculated in accordance with approved working drawing No Bridge Name Station No of Pile Total Pile Length Dia.1.0m (m) Tân Tiến Bridge Km209+329.70 24 322 Cảm Cọn Bridge Km209+690.65 12 96 Xóm Cam Bridge Km214+679 32 432 Schedule of Work Schedule is attached as Appendix-1 Noi Bai-Lao Cai Highway Construction Project Package A7: Km190+420 ~Km 218+040 Contractor: GRBCC Method Statement for Cast-in-place Concrete Pile GRBCC-MS-CIPCP-A2-EN Site Organization Site Organization Chart for Cast-In-Place Concrete Pile construction is as followings Noi Bai-Lao Cai Highway Construction Project Package A7: Km190+420 ~Km 218+040 Contractor: GRBCC Method Statement for Cast-in-place Concrete Pile GRBCC-MS-CIPCP-A2-EN Equipment and Workforce 5.1 Bored Pile Work The list of equipment and worker for a typical working party for Bored Pile Work is shown below Plural working parties will be provided to work at several locations simultaneously Detail of equipment and workers should be submitted separately in order to check and approve by the Engineer before commencement of bored piling work And they shall be inspected by the Engineer in accordance with Guide Form No BBMMNL.(Apendix -4) Table 5.1 List of Equipment for Bored Pile Work No Item Description Crawler Type Max Drilling Depth 61 m Max dia 2.0m 40t class crawler Boom Length 31 m Qty Remarks Drilling Machine (Base Machine) Service Crane Hydraulic Excavator 0.4~0.7 m3 Excavator no Diesel Generator 220KVA no Mud Screen 4-6 inches 7.5 KW no for cleaning bentonite liquid Cyclone inches no for cleaning bentonite liquid Submersible Pump inches nos Slime Pump inches nos Bar cutter Max 32 mm no 10 Bar bender Max 32 mm no 11 Air Compressor pressure 7kgf/cm2 no 12 Tremie pipe 10 inches - total 57m set 13 Screw auger D=1000mm each 14 Cleaning Bucket D=1000mm each 15 Steel Casing Pipe D=1100mm each 16 Bentonite Tank 25 m3 nos 17 Water Tank 15~ 20 m3 no 18 Bentonite Mixer 1.2 m3 no 19 Concrete Mixer Truck m3 nos 20 Concrete Hopper 1.0 m3 no no Equivalent Bauer – BG25 no Depend on bored pile length Length =6.0m if required for casting concrete depending on the site condition Noi Bai-Lao Cai Highway Construction Project Package A7: Km190+420 ~Km 218+040 Contractor: GRBCC Method Statement for Cast-in-place Concrete Pile GRBCC-MS-CIPCP-A2-EN 21 Dump Truck 10~15t nos 22 Welding Machine 23 KVA no 23 Bentonite Liquid Sampler L/S for testing bentonite 24 Mud Balance no for testing bentonite 25 Funnel Viscosity Meter no for testing bentonite 26 Sand Content Meter no for checking sand content 27 Ph paper set for testing bentonite 28 Shearometer set for testing bentonite 28 Lighting Tool L/S Serving night time working Table 5.2 No List of Worker for Bored Pile Work Item Description Foreman Skilled Worker (1) Skilled Worker (2) Common Worker to transport excavated soil to control working party for drilling, casting, cleaning hole for fabrication and installation re-bar cage Qty Remarks 10 10 5.2 Grouting Sonic Tube The list of equipment and worker for Grouting Sonic Tube is shown below The detail of equipment and worker shall be inspected by the Engineer in accordance with Guide Form No BBMMNL Table 5.3 No List of Equipment for Grouting Sonic Tube Item Air Compressor Grout Pump Grout Mixer Description 7kg/cm2 m /hour pressure 5kg/cm2 150 ltr, 750W Table 5.6 No Item Qty Remarks clearing tube with 1” hose List of Worker for Grouting Sonic Tube Description Qty Foreman to control working party Skilled Worker for grouting Common Worker Remarks Noi Bai-Lao Cai Highway Construction Project Package A7: Km190+420 ~Km 218+040 Contractor: GRBCC Method Statement for Cast-in-place Concrete Pile GRBCC-MS-CIPCP-A2-EN 5.3 Pile Head Treatment The list of equipment and worker for Pile Head Treatment is shown below The detail of equipment and worker shall be inspected by the Engineer in accordance with Guide Form No BBMMNL Table 5.3 No List of Equipment for Pile Head Treatment Item Description Qty Breaker 7kg ~ 20kg no Disk Grinder 4” disk, 620W no Air Compressor 7kg/cm no Table 5.4 No Item Remarks not fix quantity as required List of Worker for Pile Head Treatment Description Qty Foreman to control working party Skilled Worker for demolish concrete 10 Common Worker Remarks Noi Bai-Lao Cai Highway Construction Project Package A7: Km190+420 ~Km 218+040 Contractor: GRBCC Method Statement for Cast-in-place Concrete Pile GRBCC-MS-CIPCP-A2-EN Materials 6.1 Bored Pile Work List of required material is shown below Table 6.1 Material Reinforcing Bar Concrete List of Material for Bored Pile Work Description Detail CB400-V, Fy(min)=400Mpa, CB240T Fy(min)=240Mpa Class Y 30Mpa in accordance with 06400(item 2.2.1) in accordance with 06100(Item 2.2.2) Bentonite Sonic Tube Remarks in accordance with 06210(item 2.2.5) Steel pipe in accordance with 06210 Proposal of Bentonite material and Steel Pipe (Sonic Tube) should be submitted separately as procedure for material approval The bentonite suspension shall satisfy the testing criteria as specified in General Specifications 06210, item 2.2.5 Actual ratio of bentonite mix shall be subject to final approval of the Engineer Material stocked on site shall be kept off the ground and covered to protect from rain and dirty 6.2 Grouting Sonic Tube List of required material is shown below Table 6.2 Material List of Material for Grouting Sonic Tube Description Cement Detail PCB30 Remarks cement milk (W/C=100%) (Remarks) For grouting, cement milk (W/C= 100%) will be used Mix proportion is as below Cement 760kg, Water 760kg (for grout 1.0m3) Trial mix and compressive strength test for grouting will be carried out with above proportion under inspection of the Engineer And report will be submitted to the Engineer for approval before commencement of grouting work Noi Bai-Lao Cai Highway Construction Project Package A7: Km190+420 ~Km 218+040 Contractor: GRBCC Method Statement for Cast-in-place Concrete Pile GRBCC-MS-CIPCP-A2-EN Construction Procedure 7.1 Bored Pile Work 7.1.1 Work Flow of Bored Pile Work Noi Bai-Lao Cai Highway Construction Project Package A7: Km190+420 ~Km 218+040 Contractor: GRBCC Method Statement for Cast-in-place Concrete Pile GRBCC-MS-CIPCP-A2-EN 7.1.2 Description of Work Sequence for Bored Pile Work (*) Trial pile and static load test According to General Specification section 06210, Item 3.6.4 and 3.6.9 Trial pile is separate from the bridge foundation, and is installed and tested prior to commencement of construction of contract piles Sequence for construction of trial pile is the same as Sequence for construction of contract piles described in this document Location of trial pile shall be proposed by the Contractor and approved by the Engineer Method Statement for static load test of trial pile shall be made and submitted separately (1) Mobilization and Preparation Prior to commencing the drilling work, all equipment and worker shall be inspected according to Guide Form No BBMMNL with attendance of the Engineer Any obstacles at the surface or the sub-surface of the ground are to be taken out by Excavator or other drilling equipment Underground water level shall be measured before piling work by temporary well or drilled hole, which shall be made temporary with adequate depth to investigate underground water If necessary, embankment shall be applied to keep that the execution area of piling works is more than 2.0m above underground water level (2) Setting Out Pile Center The transverse line setting out: Pile center Temporary mark Reference mark The center point of each pile shall be surveyed and marked by suitable stakes After setting of casing this center point shall be re-checked to confirm the accuracy Any co-ordinations of pile shall be submitted to the Engineer to get approval Positioning shall be based on design drawings for pile layout plan and shall not deviate more than 80mm from the theoretically correct position shown on the drawing (According to General Specification, Section 6210 item 3.7) Reference marks wil be established for determination of pile centerline during construction The center of pile shall be surveyed and inspected with the Engineer’s surveyor for each pile 10 Noi Bai-Lao Cai Highway Construction Project Package A7: Km190+420 ~Km 218+040 Contractor: GRBCC Method Statement for Cast-in-place Concrete Pile GRBCC-MS-CIPCP-A2-EN before drilling (3) Setting Drilling Machine Base machine shall be set upon the pile center horizontally and vertically Offset points for pile center shall be made at least in two directions from inspected marking of pile center The centering of the machine shall be confirmed by the tip of Kelly bar or bucket Horizontal setting of machine and verticality of Kelly bar shall be checked by water level gauge or plum It is necessary to put steel plate on working ground for the foundation bed of drilling machine to keep stability of machine and bored hole (4) Pre-drilling and Setting Casing Pipe  To protect the top of hole, a casing pipe shall be installed after pre-drilling with depth less than the length of casing pipe from 0.5m to 1.0m depending on soil condition  The purpose to use casing pipe is to protect the strata below G.L from collapse caused by heavy weight of various heavy machines and also to protect the hole from mud water on the ground Inner diameter of casing pipe shall be 10~20 cm larger than designed pile diameter Length of casing pipe shall be from 6.0m to 10m depending on soil condition Casing pipe shall be inspected with attendance of the Engineer before installation  Top of casing pipe should be higher than working ground level at least 50cm and two supporters at top of casing pipe should be placed firmly on steel plates  The center of casing pipe shall be confirmed from offset marking of pile center and total station from construction point of survey, and its verticality shall be checked by water level gauge After installation of casing pipe, location of center of casing pipe and verticality shall be inspected by the Engineer’s surveyor Maximum tolerance of gradient of casing pipe is 1% 11 Noi Bai-Lao Cai Highway Construction Project Package A7: Km190+420 ~Km 218+040 Contractor: GRBCC Method Statement for Cast-in-place Concrete Pile GRBCC-MS-CIPCP-A2-EN (9) Setting Tremie Pipe The tremie pipe will be connected and lowered piece by piece until it reach to the bottom of bored hole When the tremie pipe reach to the bottom of bored hole, it shall be lifted up about 200mm in order to keep enough clearance to discharge concrete The total length of tremie pipe shall be adjusted by 1m, 2m and 3m length of pipes to adopt the level of concrete receiving hopper During installation of tremie pipe, joint of tremie such as tighten bolt and condition of gasket shall be checked strictly New Bentonite Mud and Bentonite Return Mud screen Slim Pump 22KW 90m3/h, H=100m Tremie pipe Mud sedimentation Setting of Tremie pipe Re-cleaning of the borehole (10) 2nd Cleaning by Pump or Air-lift After setting of rebar cage and tremie pipe finished the contractor shall verify specification of bentonite and sediment at the bored hole If sediment is less than 5cm and sand content is less than 6%, concrete will be carried out If failed, the bored hole have to clean again There are two methods for cleanliness Each can be chosen depending on actual conditions a) Cleaning of the bored hole by slime pump 16 Noi Bai-Lao Cai Highway Construction Project Package A7: Km190+420 ~Km 218+040 Contractor: GRBCC Method Statement for Cast-in-place Concrete Pile GRBCC-MS-CIPCP-A2-EN This method uses slime pump to clean the bored-hole by pumping bentonite slurry via tremie pipe from bottom of the bored-hole New bentonite shall be supplied from top of bored-hole This new bentonite shall replace with old bentonite and push sediments out (replacing of bentonite and cleaning of the bored hole from down to up) Old bentonite and sediment shall be disposed to temporary barrels and then to the tank and treated by sand filter rigs for the purpose of re-using Checking of sedimentation thickness at the bottom of the bored-hole as well as other properties of bentonite at bottom of bored-hole If OK The cleanliness finished b) Cleaning of bored hole by air-lift The tremie pipe and air- conducting pipe shall be laid to bottom of bore-hole Compressed air shall be conducted into air-conducting pipe and blown at the bottom of pipe Due to compressed air, bentonite and sediment at bottom of bore-hole shall be push out via the tremie pipe It had better move tremie pipe around in order to increase the efficiency of the cleaning Owing to withdraw of betonite and thus causing the deficiency of betonite It is therefore required to supplement betonite immediately to the bored hole so as to prevent bore-wall collapsing Old bentonite that pushed out of the bored-hole shall be disposed to the barrels and then to the tank and to sand filtering rigs for the re-use (11) Casting Under Water Concrete Prior to placing concrete, sample of bentonite liquid shall be taken from the hole at different depth (bottom, middle and top of bored hole) to confirm the characteristics of fluid If bentonite liquid is satisfactory to criteria that is stated in the above (5), the concrete work shall be started Prior to placing concrete, the concrete shall be checked by engineer and the installation of the ultra-sonic pipes will be checked The interval between 2nd cleaning and concreting is not more than hour Concrete shall be delivered and supplied by mixer truck from Batching plant and discharged directly to head hopper of tremie pipe in one continuous operation from tip to cut-off elevation and will be carried out in such a manner as to avoid segregation A sliding Plunger will be set within the tremie tube to prevent direct contact between the first charge of concrete and the water or Bentonite Techniques for pouring concrete are conducted in order to ensure concrete pouring continuously without interruption, to avoid concrete segregation Generally, the toe of tremie pipe shall be kept penetrated into concrete more than m for all the time during casting concrete For example, when the penetration of tremie pipe in the concrete become more than 5.0m following the raising up of concrete top, the tremie pipe will be lifted up by 3.0m and piece of tremie pipe (l=3.0m) will be cut The top level of poured concrete shall be confirmed by measuring tape prior to cutting tremie pipe The tables of “Tremie toe level control” are attached as Inspection Sheet I-13 in Appendix-4 for the guideline of controlling the penetration of tremie pipe Pouring concrete will be completed when the top of concrete has reached to the specified height The top of concrete is contaminated by bentonite liquid Therefore, surplus concrete shall be cast to ensure quality of concrete on the body of designed pile The height of surplus concrete is proposed to be more than one diameter of pile from cut-off level basically Especially for the pile of diameter 1.0 m and the pile which head is located in the temporary casing pipe, the top of 17 Noi Bai-Lao Cai Highway Construction Project Package A7: Km190+420 ~Km 218+040 Contractor: GRBCC Method Statement for Cast-in-place Concrete Pile GRBCC-MS-CIPCP-A2-EN concrete after removal of temporary casing pipe shall be kept to be 150cm above from cut-off level in consideration of settlement of concrete after removal of casing pipe and other affect of removal of casing pipe Therefore before removal of temporary casing pipe, the height of surplus concrete is proposed to be 2.0m from cut-off level or to be overflowed equivalent volume from casing top depending on the site condition However this may be adjusted by instruction of the Engineer in consideration of site condition The in-situ testing for delivered concrete such as slump and temperature shall be carried out for each delivery truck Allowable maximum slump of concrete for bored pile is 200mm Sampling for compressive test shall be carried out in accordance with General Specifications S06100 The detail is described in Inspection and Testing Plan attached in Appendix-3 In case actual volume of casing concrete from bottom of pile to cut-off level is less than concrete volume calculated by the designed dimensions of bored pile, immediately report by the Contractor is required within one day to clarify the reason and propose countermeasures to get the Engineer’s approval before commencing construction of next pile (12) Removal of Casing Pipe After completion of casting concrete from 15 to 20 minutes, casing pipe shall be removed straightly and gradually by crane or vibration hammer Principally, after removal of casing pipe from 2~3 hours, bored hole shall be backfilled by excavated soil In case that backfilling is delayed with some reason, bored hole shall be covered by steel plate or marked by stakes and rope/ wire to prevent the accident such as falling down to hole *Other Particular Description  Typical layout and Sequence of bored piling work in abutment and pier is shown on Figure 7.1 for reference  It is necessary to consider avoiding the affect of drilling to the pile which has been cast concrete already Generally newly drilling cannot be allowed to commence within distance three times of diameter of bored pile between surface of drilling pile and that of completed pile within 48hours after casting concrete  Sampling of concrete for compressive testing shall be taken at a random from top, middle and bottom section of bored pile as directed by the Engineer  Each specimen will be attached the label with signature of the Engineer for specifying  Compressive strength test will be carried out at the approved laboratory under witness of the Engineer  Clear water shall be supplied from the top of sonic tube during installation of re-bar cage and closed by steel plate with welding to avoid sonic tube being lifted up  The depth of bored hole after excavation, after 2nd clearing bottom of hole by bucket and final checking before casting concrete shall be measured by tape with weight at points including center and sonic tube points These data shall be recorded on “Pile Construction Record at Site (I-17: 1/3~3/3)” attached in Appendix-4  All excavated soil shall be disposed as waste to outside of construction site It is not suitable 18 Noi Bai-Lao Cai Highway Construction Project Package A7: Km190+420 ~Km 218+040 Contractor: GRBCC Method Statement for Cast-in-place Concrete Pile GRBCC-MS-CIPCP-A2-EN to use earthwork such as embankment or structure backfilling due to content of much bentonite Figure 7.1 Illustration of Sequence of Bored Pile Work ABUTMENT ABUTMENT 1000 1000 11750 3@3250=9750 8000 7500 3 PILE P5 1000 10 8000 3000 5000 1000 1000 15001500 1000 b1 1000 3000 3000 1000 1000 3000 1000 1000 8000 3000 1000 3000 5000 1500 CAM CON BRIDGE Abutment 2 10 11 12 19 Noi Bai-Lao Cai Highway Construction Project Package A7: Km190+420 ~Km 218+040 Contractor: GRBCC Method Statement for Cast-in-place Concrete Pile GRBCC-MS-CIPCP-A2-EN XOM CAM BRIDGE 7.2 Grouting Sonic Tube 7.2.1 Work Flow of Grouting Sonic Tube General working flow of grouting sonic tube is as followings 7.2.2 Description of Work Sequence for Grouting Sonic Tube After completion of bored pile work, sonic test shall be carried out to confirm the homogeneous of concrete of pile Grouting sonic tube shall be carried out after confirmation and approval of result of sonic test or/and core test by the Engineer Sonic test or/and core test and grouting sonic tube will be carried out per pier basically The timing of grouting work will be two cases, one is before structure excavation and before pile head treatment, and another is after structure excavation and after pile head treatment depending on the site condition Proportion of grout shall be submitted and got approval from the Engineer Trial mix for grout shall be carried out before commencement of grouting work 20 Noi Bai-Lao Cai Highway Construction Project Package A7: Km190+420 ~Km 218+040 Contractor: GRBCC Method Statement for Cast-in-place Concrete Pile GRBCC-MS-CIPCP-A2-EN The description of sequence of work is as followings (1) Inspection for mobilization by the Engineer in accordance with Guide Form No BBMMNL (2) Cleaning inside tube shall be carried out by air (compressor) with confirmation of depth of tube After cleaning tube, water inside tube shall be removed by air (compressor) (3) Grout shall be mixed according to above proportion (4) Grout hose shall be installed down to bottom of sonic tube The depth (length) of hose shall be confirmed (5) Grouting shall be carried out by grout pump Tip of grout hose shall be kept at bottom of tube until grout overflow from top of tube After grout overflow, grout hose shall be raise up and removed from tube slowly by manual Finally, condition of filling up in tube shall be confirmed by view at top of tube 7.3 Pile Head Treatment 7.3.1 Work Flow of Pile Head Treatment After structure excavation, surplus concrete at pile head shall be demolished and removed General working flow of grouting sonic tube is as followings 7.3.2 Description of Work Sequence for Pile Head Treatment (1) Inspection for mobilization by the Engineer in accordance with Guide Form No BBMMNL (2) Survey and marking shall be carried out at designed cut-off elevation on pile (3) Cutter shall be installed at above cut-off elevation Depth of cutter is approximately 3cm During cutting, special care to prevent damage re-bar of bored pile shall be paid (4) Surplus concrete above cut-off elevation shall be demolished by breaker as shown blow illustration During demolishing concrete, special care to prevent damage and bending re21 Noi Bai-Lao Cai Highway Construction Project Package A7: Km190+420 ~Km 218+040 Contractor: GRBCC Method Statement for Cast-in-place Concrete Pile GRBCC-MS-CIPCP-A2-EN bar of bored pile Loose concrete on cut-off surface and on re-bar above cut-off shall E.L shall be remove manually by Breaker 7~20kg weight Marking 20cm above cut-off level Install cutter 3cm depth at cut-off level Cut-Off Level by Breaker 7kg weight or less (5) As built inspection survey such as cut-off E.L and eccentricity shall be carried out with attendance of the Engineer’s surveyor Condition of concrete surface shall be inspected by the Engineer The tolerance of cast-in place concrete pile is as followings  Cut-off elevation of pile head: +20mm  Eccentricity: 80mm After completion of all scope of work for Cast-in-place Concrete Piling such as Bored Piling Work, Sonic Test, Grouting Sonic Tube and Pile Head Treatment, acceptance committee will be carried out per pier Quality Control “Inspection and Testing Plan” is attached in Appendix-3 “Check List” is attached in Appendix-4 Check List to be used for inspection with the Engineer will be replaced to ones provided by the Engineer, which is one of the as built document for acceptance committee 8.1 Quality control of construction bored pile The quality of the work of bored piles were constructed from the test material inputs All steps in the construction process should be checking and accepting by supervision consultants The quality problems in the construction process of interest as follows: - Locate the correct position looking pile, before, during and after the construction process - During the drill, Tremie tube should be checked regularly to ensure always stay upright - During the drill, if discovered geological drilling big difference with the design, it should immediately inform the consultation process to take measures - The level and quality bentonite fluid levels should be checked regularly to ensure no power drop caused drill hole wall - The process outsourcing to lower cage reinforced done by machine, the quality test before fully 22 Noi Bai-Lao Cai Highway Construction Project Package A7: Km190+420 ~Km 218+040 Contractor: GRBCC Method Statement for Cast-in-place Concrete Pile GRBCC-MS-CIPCP-A2-EN lowered - The concrete must be conducted continuously and rapidly Absolutely not pour concrete, and security links are down - The process of maintenance must be done immediately after the concrete is finished - The opinion of the consultant directing the field work, to consider implementing immediately to ensure the quality of work 8.2 Quality control mortar tube pump Sonic Sonic mortar tube pump work to be done by consulting and taking the field before moving onto the next phase of construction Any incidents should be reported immediately to the consultant to treatment measures 8.3 Control the quality of Pile Head Treatment Construction process handling the pile must be supervised by consultants Construction process must not disrupt other structures not related to the broken part Absolutely not be constructed by manual methods Safety Control Safety control shall conform to submitted “Project safety control plan” Prior and during the execution of Cast-In-Place Concrete Pile Work, basic safety precautions shall be implemented to work efficiently and to prevent any accident or casualty In additional, Safety control must conform to Chapter 8:” Safety measurement during executing bored piles” – Specification 22TCN 257-2000 Particular item for safety control is as follows Anticipated Accident No Preventive Action  Prior to starting of piling work, a joint meeting with relevant General staffs has to be held for the purpose of general explanation on whole contents of works as well as mutual implementation of efficient work  Safety guard will be set around the bored hole to prevent the Downfall Accident falling accident after drilling machine shifting from hole  The safety belt must be used for the working at high elevation such as on the boom of crane or drilling machine 23 Noi Bai-Lao Cai Highway Construction Project Package A7: Km190+420 ~Km 218+040 Contractor: GRBCC Method Statement for Cast-in-place Concrete Pile GRBCC-MS-CIPCP-A2-EN  The weight of material to be lifted shall be confirmed  The working radius and nominal lifting capacity of crane must be checked as well  Sling tool such as wire and shackle shall be checked daily Capacity of each tool shall be instructed to worker and Accident by crane (lifting material) and Drilling Machine confirmed before using  Stability of base of equipment shall be ensured, if necessary with steel plate  When the Drilling Machine does not work, excavation bucket will be put on the ground for safety  “Keep Out under lifting material” shall be instructed at site  To keep limit of speed (20km) at site Traffic Accident  A vehicle shall be moved with assistance by signal in case it moves backward  Setting signalman at entrance of site  Adequate earthing shall be installed for electric equipment such as welding machine and generator Electric Accident  Welding work shall be carried out with adequate P.P.E such as facemask, rubber boots, rubber grove, especially at wet area  Daily checking for equipment shall be carried out to confirm the condition of equipment Others  Proper lighting system shall be provided for night time working 10 Environmental Control Environmental control shall conform to the submitted “Environment control and protection plan” Responsibility for surrounding environment shall be implemented during work and in compliance to the Condition of Contract and Vietnam’s National Law on Protection of Environment and other relevant legislation such as: Government Decree No.175/CP, Government Decree on providing Guidance for the Implementation of the Law on Environmental Protection, 1994 Particular Item to be controlled is as follows  Excavated surplus soil will be removed completely from the site, and disposed at specified dispose area  Waste Bentonite slurry shall be collected, safely handled and disposed to the designated disposal area arranged which is approved by the Engineer  In case of slime truck, seal condition of tank will be checked carefully to prevent any leakage on the public road  Working time for bored pile work will be made by 24 hours operation Special care for noise 24 Noi Bai-Lao Cai Highway Construction Project Package A7: Km190+420 ~Km 218+040 Contractor: GRBCC Method Statement for Cast-in-place Concrete Pile GRBCC-MS-CIPCP-A2-EN and vibration shall be taken If any other problems occurred in the site, applicable counter measures or prevention action would be considered immediately and executed as soon as possible Theses matters should be controlled on management stage by respective Construction Manager and on actual activity stage by respective Engineer 25 Noi Bai-Lao Cai Highway Construction Project Package A7: Km190+420 ~Km 218+040 Contractor: GRBCC Method Statement for Cast-in-place Concrete Pile GRBCC-MS-CIPCP-A2-EN Appendix-1 (Construction Schedule) * sheet is attached 26 Noi Bai-Lao Cai Highway Construction Project Package A7: Km190+420 ~Km 218+040 Contractor: GRBCC Method Statement for Cast-in-place Concrete Pile GRBCC-MS-CIPCP-A2-EN Appendix-2 (Drawing of hanging bar) 27 Noi Bai-Lao Cai Highway Construction Project Package A7: Km190+420 ~Km 218+040 Contractor: GRBCC Method Statement for Cast-in-place Concrete Pile GRBCC-MS-CIPCP-A2-EN * 01 sheets is attached 34 Noi Bai-Lao Cai Highway Construction Project Package A7: Km190+420 ~Km 218+040 Contractor: GRBCC Method Statement for Cast-in-place Concrete Pile GRBCC-MS-CIPCP-A2-EN Appendix-3 (Inspection and Testing Plan) * sheets are attached 36 Appendix-4 (Check Sheet) Inspection Sheet for Acceptance Document of Construction Works  Responsibility for Signing Acceptance Documents…: (2 sheets)  BBMM Minutes of benchmark hand-over (1 sheet)  Check List for Acceptance of Construction Work (DMNTC-I): (1 sheet) I-1.Acceptance Minutes of Completed Work Item: (1 sheet) I-2.Acceptance Minutes of Construction Work: (1 sheet) BBMMNL Checking Record of Equipment and Labour at Site: (3 sheets) I-3.Checking Record of Bored Pile Co-ordinates: (1 sheet) I-4.Checking Position of Drilled Holebefore casting concrete (1 sheet) I-4a Checking Position of Drilled Hole before drilling (1 sheet) I-5.Drilled-Hole Logging: (1 sheet) I-6.Checking Report of Drilled-Hole for Bored Pile (1 sheet) I-7.Bored Pile Record: (2 sheets) I-8.Checking Report of Steel Cage Section: (1 sheet) I-9.Checking Report of Combination and Joint of Steel Cage (1 sheet) I-10 Checking Report of Steel, General (1 sheet) I-11 Checking Report of Duct Installation for Bored Pile Testing (1 sheet) I-11a Bentonite Testing (1 sheet) I-12 Checking of Construction Preparation work (1 sheet) I-13 Report on Concrete Placing (2 sheets) I-14 Concrete Compressive Strength Test (1 sheet) I-14a Record of Sonic Logging Test (1 sheet) I-15 Report on Grouting The Sonic Tube (1 sheet) I-16 Summary of Bored Pile Work (1 sheet) I-17 Pile Construction Record at Site (2 sheets) Total 30 sheets attached ... 218+040 Contractor: GRBCC Method Statement for Cast-in-place Concrete Pile GRBCC- MS- CIPCP- A2- EN 5.3 Pile Head Treatment The list of equipment and worker for Pile Head Treatment is shown below... 218+040 Contractor: GRBCC Method Statement for Cast-in-place Concrete Pile GRBCC- MS- CIPCP- A2- EN to use earthwork such as embankment or structure backfilling due to content of much bentonite Figure... Contractor: GRBCC Method Statement for Cast-in-place Concrete Pile GRBCC- MS- CIPCP- A2- EN and vibration shall be taken If any other problems occurred in the site, applicable counter measures or prevention