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Package ADB-HNPC-TCTD-P01: Designing, supplying, installing and operating underground cable 110kV Component : Underground cable 110kV Thanh Cong - Thuong Dinh Project : Hanoi and Ho Chi Minh City Power Grid Development CHAPTER I BASES FOR PROJECT FORMULATION AND IMPLEMENTATION Construction method of this project is prepared on the following bases: Applicable standards: No 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 Name of Codes and Standards Symbol Code on Electric Facility 11TCN-19-2006 National Technical Codes for Installation of Power Network: QCVN QTĐ-7:2009 BCT enclosed with the Decision No 54/2008/QĐ-BCT dated December 30, 2008 Quality management in installating & building works TCVN 5637: 1991 Basic principles Acceptance of construction quality of construction works TCXDVN 371: 2006 Acceptance of construction works TCVN 4091: 1985 Handover of construction work – Basic principles TCVN 5640: 1991 Construction method TCVN 4055: 1985 Procedures for formulation of the building organization TCVN 4252: 1988 design and the building work design National regulations on construction and acceptance Regulations on construction supervision and acceptance of Overhead power line with voltage up to 500kV – Enclosed with Decision No 908/QD-EVN dated May 28, 2008 of Vietnam Electricity Foundation works – Construction and acceptance TCXD 9361: 2012 Technical safety regulations in construction work TCVN 5308: 1991 Earthwork – Specifications for construction and acceptance TCVN 4447: 2012 Monlithic concrete and reinforced concrete structures TCVN 4453:1995 Specifications for construction and acceptance Concrete and reinforced concrete structures TCVN 5574: 2012 Concrete – Requriements on natural moisture curing TCVN8828: 2012 Aggregates for concrete and motar Technical requirements TCVN 7570: 2006 Aggregates for concrete and motar Test methods TCVN 7572: 2006 Heavy weight concrete - Method for determination of TCVN 3118: 1993 compressive strength Heavyweight concrete -Method for determination of flexural TCVN 3119: 1993 tensile strength Heavy weight concrete compounds - Slump test TCVN 3106: 1993 Specifications for Portland cement TCVN 2682: 2009 TCVN 6260: 2009 Cements – Standards for testing cement TCVN 4029: 1995 Water for mixing Concrete and Mortar - Technical TCXDVN 302: 2004 Specification Chemical addictives of concrete TCXDVN 325: 2004 Bored pile – specifications for construction and acceptance TCVN 9395: 2012 Hot-rolled steel for reinforcement of concrete TCVN 1651: 2008 CONSTRUCTION METHOD PAGE Package ADB-HNPC-TCTD-P01: Designing, supplying, installing and operating underground cable 110kV Component : Underground cable 110kV Thanh Cong - Thuong Dinh Project : Hanoi and Ho Chi Minh City Power Grid Development No Name of Codes and Standards 27 Carbon steel for normal concrete structure Steel grades and technical requirements Tensile and bending test of reinforcement 28 29 30 Symbol TCVN1765: 1975 TCVN 197: 2002; TCVN 198: 1985 TCXD 227: 1999 TCVN 3223: 2000 32 33 Reinforcement in concrete Welding arc Covered electrodes for manual arc welding of mild steel and low alloy steel - Symbol dimension and general technical requirement Covered electrodes for manual arc welding of mild steel and low alloy steel - Test method Manual arc welding Specifications for steel shape and plate 34 Steel grades 35 36 Hot dipped galvanized Bolts and nuts 37 Steel structure – Fabrication, assembly and acceptance – Technical requirements Decree No.15/2013/NĐ-CP dated 06/02/2013 of the Government on quality management of construction work Circular No 10/2013/TT-BXD dated 25/7/2013 detailing some articles of construction quality management; Circular No 09/2014/TT-BXD dated 10/07/2014 amending and supplementing some articles of Circulars providing guidance on Decree No 15/2013/NĐ-CP Procedures for electrical safety issued by Vietnam Electricity enclosed with Decision No 1157/QD0EVN dated December 19, 2014 of the General Director of Vietnam Electricity Regulations on acceptance of bolt linked steel structure for voltage class up to 500kV enclosed with Decision No 82/QĐ-EVN-QLXD-TĐ dated 07/01/2003 of EVN Regulations on hot dipped galvanized steel of Vietnam Electricity enclosed with Decision No 2982/QĐ-EVN-TĐ dated 10/09/2003 Applicable regulations on occupational safety, urban traffic safety, environmental protection and other relevant documents And some other relevant regulations and standards 31 38 39 40 41 42 43 CONSTRUCTION METHOD TCVN 3909: 2000 TCVN1691: 1975 JISG3101, 3106/3192 ΓOCT8509-72; TCVN 1656: 1993 SS400, CT38, SS540, S490 18TCN 04: 1992 TCVN 1876: 1976; TCVN1896: 1976; TCVN 1889: 1976; TCVN 1897: 1976; TCXD 170-1989 PAGE Package ADB-HNPC-TCTD-P01: Designing, supplying, installing and operating underground cable 110kV Component : Underground cable 110kV Thanh Cong - Thuong Dinh Project : Hanoi and Ho Chi Minh City Power Grid Development The Bidding document prepared by the Hanoi Power Development Project Management Board (Hanoi DPMB) – Hanoi Power Corporation on “Package ADB-HNPC-TCTD-P01: Design, providing, installing and operating underground cable network of 110kV - Subproject:Underground cable network of 110kV Thanh Cong – Thuong Dinh – Project: Development of Hanoi and Ho Chi Minh Electric Grids” Construction experiences on electrical works of Power Industry Construction Joint Stock Company CHAPTER II GENERAL INFORMATION ON THE PROJECT I PROJECT LOCATION: The project is designed in the urvan traffic road area of two districts as Dong Da and Thanh Xuan, Hanoi City II PROJECT CHARACTERISTICS: Key specifications: CONSTRUCTION METHOD PAGE Package ADB-HNPC-TCTD-P01: Designing, supplying, installing and operating underground cable 110kV Component : Underground cable 110kV Thanh Cong - Thuong Dinh Project : Hanoi and Ho Chi Minh City Power Grid Development 1.1 110kV Underground cable network - Voltage class: 110kV - Number of circuits: - Beginning terminal: 110kV Busway of Thanh Cong 220kV transformer station - End terminal: Circuit 1: 110 kV Busbar of Existing Thuong Dinh 110kV Transformer station Circuit 2: 110kV Busway of Expanded Thuong Dinh 110kV Transformer station - Length: 3.728 km - Type of cable: Single phase underground cable Cu/XLPE-1x1200mm2-110kV - Earthing: Using TT Grounding system - Installation of cable joint and cable ends must be compliant with techncial standards of cable - Optical cable: using non-metal optical cable (NMOC) + Method of cable placing: - The section burried directly on the ground, pressure cable is covered by HDPE D200 conduit and protected by concrete blocks Optical cable is placed in HDPE D50 tube - In the scope of transformer station, cable is placed on the rack of internal cable trench 1.2 Expanded area of Thanh Cong 220kV Transformer station - Thanh Cong 220kV Transformer station is located in the end of Dang Tien Dong Street, Dong Da District, Hanoi City under management and operation of Power Transmission Company No.1 – National Power Transmission Corporation - Thanh Cong 220kV Transformer station is a in-house GIS transformer station (Gas insulated switchgears by SF6 gas) with permanent scope including 02 transformers of 220/110/22kV-250MVA and 03 transformers of 110/22/10kV-63MVA - In this period, Thanh Cong 220kV Transformer station has been making design and construction investment: 01 220/110/22kV-250MVA transformer, 02 110/22/10kV-63MVA transformers and 22kV-25MVAr resistance band - Scope and scale of expanded items of Thanh Cong 220kV Transformer station is to install 02 GIS dividers for Thuong Dinh 110kV Transformer station along with solutions of construction, control, protection, contact information and power self-supply, etc., for 02 line dividers Description of cable route: + Thanh Cong – Thuong Dinh 100kV underground cable route starts from 110kV Busway of Thanh Cong 220kV Transformer station (located in Dong Da District, Hanoi City) and ends at 110kV Busbar of Thuong Dinh 100kV Transformer station (located in Thanh Xuan District, Hanoi City) The underground cable route goes over some streets: CONSTRUCTION METHOD PAGE Package ADB-HNPC-TCTD-P01: Designing, supplying, installing and operating underground cable 110kV Component : Underground cable 110kV Thanh Cong - Thuong Dinh Project : Hanoi and Ho Chi Minh City Power Grid Development + Section designed in Hoang Cau – Thai Thinh 2: From Thanh Cong 220kV Transformer station, going over the right side of road bed towards Hoang Cau – Thai Thinh In this section, the cable route goes parrallel with Ha Dong – Thanh Cong 110kV, 220kV underground cable network + Section designed in Nguyen Ngoc Vu – new Khuong Dinh: After crossing to the end of Thai Thinh 2, the cable route goes across Lang Street, crossing To Lich River at position of Moc bridge, then the route turns left and goes cross Nguyen Ngoc Vu to Nguyen Trai Street, then to new Khuong Dinh Street In this section, the cable goes cross the road bed along the left sidewalk + Section designed Khuong Dinh Street: To the end of new Khuong Dinh, the cable continues to Khuong Dinh Street, and in this section, the cable goes cross the road bed along the right sidewalk, then turns to Lane 282 to Thuong Dinh 110kV Transformer station + Section designed in expanded Thuong Dinh 110kV Transformer station: In the expanded Thuong Dinh 110kV Transformer station, the cable route is placed on the cable trench of the Transformer station Circuit No.2 will connect to E09 compartment of expanded station Circuit No.1 continues to go inside the cable trench to the existing station and connect to E04 compartment + These are main streets with high populuation and vehicle desity with the peak hours lasting from 6.00am to 22pm These streets are quite narrow + The cable route has big angles in turning positions: Thanh Cong 220kV Transformer station – Hoang Cau, Lang – Moc Bridge – Nguyen Ngoc Vu, and the beginning of Thuong Dinh 110kV Transformer station Some obstacles crossing with cable route: - Crossing with water supply, drainage conduitlines and power lines: 24 times - Road across : time - Intersection : times III DESCRIPTION OF KEY WORKS OF THE PACKAGE This package include the following items: - Provision of materials and supplies to the package - Construction of cable trench, joining tunnel and cable hangers crossing To Lich River - Placement of HDPE conduit - Inspection, acceptance and handover of the completed work Description of key works of the Package 2.1 Construction work CONSTRUCTION METHOD PAGE Package ADB-HNPC-TCTD-P01: Designing, supplying, installing and operating underground cable 110kV Component : Underground cable 110kV Thanh Cong - Thuong Dinh Project : Hanoi and Ho Chi Minh City Power Grid Development - The Contractor shall take full responsibility for making agreements on temporary land borrowing, temporary roads and compensation for construction work with managing agencies and local authorities based on the Contractor’s measures - To carry out leveling work, cable trench, cable joint tunnel , cable hanger, installation of HDPE conduit, accessories, earthings and other related works as shown in the design document and specifications of bidding document 2.2 Supply of materials, equipment and transportation of materials to the site foot - All HDPE piple, building materials and cable hanger crossing Nhue River, cable signal board, cable signal pole, grounding copper wire along the route are supplied by the Contractor - The Contractor shall be responsible for transporting materials and equipment to the site Cost of transport shall be included in the Contractor’s breakdown quotation IV CONSTRUCTION SEQUENCES 1, To receive design document provided by the Employer 2, To read and check the design document 3, To prepare bill of quantity 4, To make concrete tests and steel tests 5, To assign works to construction team 6, To make plan for manufacture and contracts for purchase of materials and supplies 7, Gia công cốt thép, tiếp địa To fabricate reinforcement and earthing work 8, To organize working team for receiving land mark, foundation position with the Employer and Design Consultant 9, To organize working team for inspection of route, distances and centre line positioning, direction stake, protection stake, route as-buitl and making comparison with design scheme 10, To set up management board office, material warehouse and yards 11, To prepare and submit construction method to the Employer 12, To settle outstanding issues on temporary roads, material yards, etc., 13, To make application for cutting road permit and prepare traffic safety assurance measures 14, To execute underground cable trench, dig cable joint tunnel, manholes, cable hanger foundation crossing rivers 15, To install cable hanger crossing rivers, underground cable earthing and cable rack 16, To make acceptance and handover to put the work into operation CONSTRUCTION METHOD PAGE Package ADB-HNPC-TCTD-P01: Designing, supplying, installing and operating underground cable 110kV Component : Underground cable 110kV Thanh Cong - Thuong Dinh Project : Hanoi and Ho Chi Minh City Power Grid Development CONSTRUCTION METHOD PAGE Package ADB-HNPC-TCTD-P01: Designing, supplying, installing and operating underground cable 110kV Component : Underground cable 110kV Thanh Cong - Thuong Dinh Project : Hanoi and Ho Chi Minh City Power Grid Development CHAPTER III SITE PREPARATION I SITE ORGANIZATION: For execution of “Package ADB-HNPC-TCTD-P01: Design, providing, installing and operating underground cable network of 110kV - Sub-project:Underground cable network of 110kV Thanh Cong – Thuong Dinh – Project: Development of Hanoi and Ho Chi Minh Electric Grids”, the Contractor shall set up a Site Management Board and the Site Manager, on behalf of the Contractor shall manage construction work The Site Management Board office is located in Dong Da District (near construction location of 110kV underground cable route) and equipped full modern equipment and facilities for production management and control as well as making acceptance between the Contractor, the Employer’s Representative, the Design consultance and managing agencies Site Organization chart: CONTRACTOR: POWER INDUSTRY CONSTRUCTION JOINT STOCK COMPANY EMPLOYER’S REPRESENTATIVE: HANOI DPMB SUPERVISION CONSULTANT SITE MANAGEMENT BOARD ADMINISTRATIVE OFFICE, STORE KEEPER, SECURITY GUARD SUPPLY OF MATERIALS, MECHANICAL CONSTRUCTION AND SURVEY WORK SUPERVISION OF TECHNICAL QUALITY AND SAFETY CONSTRUCTION TEAM NO CONSTRUCTION METHOD CONSTRUCTION TEAM NO.2 CONSTRUCTION TEAM NO.3 PAGE Package ADB-HNPC-TCTD-P01: Designing, supplying, installing and operating underground cable 110kV Component : Underground cable 110kV Thanh Cong - Thuong Dinh Project : Hanoi and Ho Chi Minh City Power Grid Development Notes to Site organization chart The Contractor shall sign the Construction work with Hanoi DPMB The Company’s Director shall be responsible to the Government and the Employer for quality, progress and HSE of the work * Responsibility for organization and implementation - The Director and functional departments & boards shall communicate with the Employer’s departments & boards during construction work To direct and assign specific tasks of each work item to Departments of Planning, Supplies, Technical, Labor Organization, Finance Accounting to assist the Site Management Board to complete the work in accordance with the construction schedule, technical requirements and absolutely occupational safety as well as to perform management of construction quality - The Director shall direct to set up the Site Management Board and assign specific tasks to 04 construction teams * Site Management Board Organization and responsibilities of the Site Management Board The Site Management Board shall be under direction and management of the Director and shall report Director all construction activities (once per week) The Site Management Board shall make direct communication with A Technical Supervisor, Design consultant, Land Acquisition Board members of the Employer, local authorities and other relevant agencies related to construction work The Site Management Board shall directly receive and maintain materials for supply to construction teams The Site Management Baord shall directly guide, instruct, supervise in techniques, HSE and shall assign and push construction teams to accelerate the construction work + To take part in weekly meeting with the Employer in the site + To make partial acceptance of completed work for shifting to next construction stage and acceptance for completed work The Site Management Board’s responsibilities are to direct construction teams to complete the work in accordance with construction schedule, technical requirements, quality, safety and environmental hygiene after completion of the work Key personnel of Site Management Board - Site Manager: 01 + Mr Tran Văn Bo – a Construction engineer with more than 15 years of being site manager of underground cable works - Technical team: 02 Engineers, including: 01 Electrical engineer and 01 Construction engineer with more than 05 years of being site supervisor of underground cable works CONSTRUCTION METHOD PAGE Package ADB-HNPC-TCTD-P01: Designing, supplying, installing and operating underground cable 110kV Component : Underground cable 110kV Thanh Cong - Thuong Dinh Project : Hanoi and Ho Chi Minh City Power Grid Development + Mr Tran Viet Thuong – Construction engineer + Mr Le Duc Tan – Electrical engineer - Environmental Controller Team: Mr Tran Thong Phan – Environmental technology engineer with more than 05 years in construction work and environmental supervision shall be responsible for daily supervising the Environmental operation (EO) of the Contractor - Safety and occupational hygiene: Mr Do Danh Hung, a staff attended and granted the HSE training certificate in construction works shall be in charge of supervising safety operations during construction work - Bộ phận Kế hoạch, vật tư: gồm 01 người Planning & Supplies Team: 01 people - Occupational safety – industrial hygiene: 01 people - Administrative and medical team: 01 people * Construction teams: In order to complete the work in accordance with the construction quality, progress and occupational safety – industrial hygiene, the Contractor shall arrange 03 construction teams (02 construction teams for underground cable route and 01 for construction of station) with 10 – 15 workers and 01 technical engineer for each team Total technical workers taking part in the project is 50 skilled ones with grade 4/7 and upwards (as for some common works which are not required workmanship, we shall sign short-term contracts with local common labor with the number of 10 – 15 people subject to construction progress) Construction team No 1&2: to execute cable trench, building cable trench, joint tunnel, manhole, cable hanger crossing rivers, earthing Construction tem No.2: To execute renovation work of Thanh Cong station Tasks of construction teams To execute complete works from digging and backfilling cable trench, installation of cable rack, construction of joint tunnel, bending tunnel, cable hanger crossing river, eathing; to execute renovation work in Thanh Cong 220kV station completely and take responsbility for making acceptance with the Employer untill completion of work handover To be under direction and assignment of construction work and to receive, use and preserve materials and equipment from the Site Management Board To prepare and submit weekly construction schedule to the Site Management Board To direct, organize and execute construction work in accordance with the approved design drawings, procedures and regulations as well as according to construction schedule and requirements on quality, occupational safety and industrial hygiene To take care the living standards of staff and employees working in the site To prepare daily report on all construction activities to the Site Management Board The construction teams shall be under direction and assignment of construction work and to receive, use and preserve materials and equipment from the Site Management Board CONSTRUCTION METHOD PAGE 10 Package ADB-HNPC-TCTD-P01: Designing, supplying, installing and operating underground cable 110kV Component : Underground cable 110kV Thanh Cong - Thuong Dinh Project : Hanoi and Ho Chi Minh City Power Grid Development Fire fighting measures 2.1 Fire alarm System: Using gongs or any other sound devices to beat repeatedly Notifying the nearest police fire brigade to know location of the fire 2.2 Preparing the fighting agent: Fighting agents are mainly water and sand, often checked by fire calculation In the M & E workshop, if there is a gasoline pump, need to be equipped with fire extinguisher spraying foam or inert gas sprayer for fire fighting 2.3 Fire fighting tools and equipment: In inflammable areas on the site must be equipped with rudimentary tools such as ladder, hook, bucket, sand shovel, water sprinkler, sack, portable sprayers These tools must be in the designated places, can be painted red to attract attention and easy to find when needed and not used in other porposes 2.4 Organization of Fire brigade: All members present in the fire area are Fire brigade under the State's ordinance In addition to learning about labor safety, it is necessary to disseminate and guide basic fire fighting techniques for everyone 2.5 Insurrance: In addition to the insurance purchased by the owner, the joint venture of contractors shall fulfill all types of insurance according to the Bidding document and comply with current regulations of the State, including: Insurance of supplies, equipment and assets of joint venture of contractors Insurance of goods, supplies and equipment in the course of transportation from the place of receipt of goods to the construction site Insurance for injury and death for human of the joint venture of contractors Coverage includes liability to third parties IV ENVIRONMENTAL, LABOR SANITATION Labor sanitation 1.1 Micro-climate sanitation on the site: To avoid sunlight, solar radiation and take advantage of the wind direction, auxiliary production factories are built with reasonable design, sky door, creating good ventilation CONSTRUCTION METHOD PAGE 70 Package ADB-HNPC-TCTD-P01: Designing, supplying, installing and operating underground cable 110kV Component : Underground cable 110kV Thanh Cong - Thuong Dinh Project : Hanoi and Ho Chi Minh City Power Grid Development At the field, there is a sunshade for people who work outdoors or shingled roof to protect the sunlight when constructing the foundation or roof floor Improving technique, mechanizing construction process to reduce Labor force Using personal protective equipment: clothing, gloves, respirator Creating conditions for rest and fostering in kind for workers, providing sufficient drinking water Ensuring adequate bathing facilities for workers to wash after working 1.2 Dust prevention on site: Laying out material yard such as sand, stone, mortar mixer away from other workplaces and at the end of mainstream wind direction Sprinkling with water to moisten the materials during construction will generate dust such as sprinkling sand when transporting, spraying water when unloading camp Workers working on the site must use labor protection devices such as clothing, hat, in particularly dusty places, they need to use mask, glass, mask, etc to prevent dust 1.3 Construction machinery and technique must be selected to minimize noise: Construction machinery and equipment used for construction are mainly machines with capacity is not large (such as generator, concrete mixer ) Construction unit will reduce the noise emitted by machinery and motor to a minimum by adjusting the balance of the machine to reduce the inertia force causing noise; In surface vibrators can cover the machine with vibration-reducing materials such as felt sheet impregnated bitum, rubber, plastics Personal protective equipment should be provided to protect workers in the presence of noise and vibration, such as dressing, plastic buttons sealing the ears to reduce the noise; using anti-vibration shoes with rubber soles or rubber boots; using special gloves with lining in palm made of foam rubber and thickness when handling compactor or boring machine Selecting construction methods so that environmental impact is minimal: In the detailed construction method, the contractor presented the construction plan using modern machines with less environmental impact as well as the choice of Manual construction method combined mechanical method for each item Construction equipment must be properly maintained: CONSTRUCTION METHOD PAGE 71 Package ADB-HNPC-TCTD-P01: Designing, supplying, installing and operating underground cable 110kV Component : Underground cable 110kV Thanh Cong - Thuong Dinh Project : Hanoi and Ho Chi Minh City Power Grid Development Equipment for construction on the site is maintained periodically, according to the operation cycle of equipment to ensure that the machinery does not pollute the environment around the construction site The contractor takes full advantage of the existing roads to serve the construction, restricts the construction of new roads to avoid costing a lot and affecting the cultivated area of the households that have crossed the road Temporary drainage system, drainage canal (if any) is not allowed to contaminate surface water during construction of column foundation or other items Minimizing the tree clearing activity on the access corridor or construction item on the land with many trees in the harvest The clearing of trees will follow the permissible rules of the works Species of special trees are retained or removed to locations outside the power grid safety corridor Workers at the site absolutely not cut down plants indiscriminately without the permission of the local authority, not cultivate on land around the accommodation or harvest plants illegally Cutting down trees and clearing or pruning trees are proposed so that plants owner can understand the benefits or harms of cutting trees on the route corridor Clearing trees on the passing line only covers parts of felling trees to the required level in the power grid safety corridor or pruning the tree to the suitability and will remove the cut parts out of the field to not affect the area of cultivated land in the area near the site Excessive soil and stone from filling the footing will be leveled up on roads or neighboring houses after approved by the local community or landowner Flammable and explosive fuels and fuels easily spreading on water are stored safely and highly above flood level Construction activities are only carried out after sent the notification to the local commune people's committee, the population group, and the specific time program, the construction of the works can only take place daytime unless progress should be urgent construction at night then must have agreement and permission of local government The contractor uses a self-contained rental scheme (built solidly and has domestic waste treatment system with electricity and water) used as construction executive headquarter to serve the work timely and effectively to limit the lease of land to build a new operating building is costly and detrimental to the environment The land occupied permanently when the construction, Constructor must ensure the construction as designed CONSTRUCTION METHOD PAGE 72 Package ADB-HNPC-TCTD-P01: Designing, supplying, installing and operating underground cable 110kV Component : Underground cable 110kV Thanh Cong - Thuong Dinh Project : Hanoi and Ho Chi Minh City Power Grid Development Roads to be used for construction on the site must be repaired or embellished (if needed) to meet the standard for vehicles transporting materials to access It is necessary to collect immediately fallen materials on the road and return the construction road immediately after the completion of the column erection The soil discharged from digging the soil from the footings, cable tunnels will be disposed in locations allowed by local government Construction waste will be removed from the construction site and cleaned up the construction area 1.4 Lighting on site: In both cases of natural lighting and artificial lighting must ensure that light is evenly distributed in the work area and throughout the field of view, enough brightness and there is no glare, no dark shadow and the difference in luminance of the foundation and the object When night-time construction, if the normal headlights are not guaranteed, lighting headlamps must be arranged When constructing deep pits, with many steels or other underground structures, special lights must be used to ensure safety In places where there are explosive substances, must use battery-operated lights, flashlights Construction sanitation: Construction sanitation is to create a good working environment, ensure the health and safety for workers, contribute to increase labor productivity and shorten construction time Field clearing and cleanup work must be done immediately after completion of the work Contractor must clean all the plants, buildings, construction equipment, waste materials, concrete formwork and other surrounding materials Unused materials must be burned or replaced in place without causing the annoyance and opposition from the people After the completion of the cleaning work, the Contractor shall invite the Investor to inspect the site and certify the completion to the Contractor 2.1 Technical measures a) Construction sanitation in the construction site: Performing the spraying methodor covering canvas method to prevent dust in the building is under construction Arranging the toilet (WC) at the end of the wind direction, in the corners, ensuring the beauty of the site CONSTRUCTION METHOD PAGE 73 Package ADB-HNPC-TCTD-P01: Designing, supplying, installing and operating underground cable 110kV Component : Underground cable 110kV Thanh Cong - Thuong Dinh Project : Hanoi and Ho Chi Minh City Power Grid Development b) Construction sanitation outside the site: On road sections near the site, it is possible to spray water on dry or sunny days or periodically clean the road if the production of the site caused dirty 2.2 Organizational measures Putting the construction sanitation into the internal labor regulations of the construction site After every working day, all workers must self-clean their working place, machinery and equipment On weekend, the workers conduct general cleaning throughout the site Combining responsibility and motivating workers to perform the labor sanitation through bonus to encourage Frequently educating and propagating all workers on the construction site that the sense of hygiene construction for the site means to ensure sanitation for the community After the construction is complete, must clean equipment, materials and people outside the construction site V TRAFFIC SAFETY MEASURES The supplies, equipment such as cable lot, steel cable bridge, electrical equipment will be transported to the site by truck, requiring vehicles to be ensure when entering the roundabout, the components are not leveled or twisted to spill material or equipment causing unsafety The speed of the vehicles when transporting materials - equipment to the site is about 35km / hour In the narrow road, the supply, the road must turn down must turn down speed to 10 km / hour It is necessary to arrange and lay out the number of trips so that the equipment is not bulky, ensure not to break or chip materials and equipment The driver is a person who has long experience in the transportation of electrical supplies, equipment and must have detailed instructions on rules and instructions during transportation Cars must meet the conditions for traffic safety inspection When loading and unloading supplies, this equipment must use a crane with sufficient load, the cables must be firm and balanced Before lifting, must test the load, try to lift to make sure the crane is balanced Motorcycles, vehicles transporting materials into and out of the site must cover the canvas carefully, not make dirt the street or off-site areas Garbage trucks, plant peeling layer must be transported by trolley, or containers covered with canvas CONSTRUCTION METHOD PAGE 74 Package ADB-HNPC-TCTD-P01: Designing, supplying, installing and operating underground cable 110kV Component : Underground cable 110kV Thanh Cong - Thuong Dinh Project : Hanoi and Ho Chi Minh City Power Grid Development When working on site at locations closed to traffic roads or near the transportation location of construction motorcycles of other construction items must have a construction sign site Do not park your motorbike and equipment on the road, in the end of work shift must be gathered to the parking lot specified * Traffic safety when installing cable bridge, Lifting and lowering the cable lot by crane: In order to ensure the safety when constructing, it is necessary to ensure the following requirements: Making the procedures for permission of the Department of Transport for crane can circulate on national highways where the crane had to move over or stop to perform the erection of the column - Making the procedures with local authorities to get permission for the crane to access the roads managed by local authorities for construction - When conducting the construction, erection, lifting should: + Placing traffic signs (according to the Ministry of Transport); Appointing person of the regular attendance and traffic guidance to avoid congestion, ensure smooth traffic + Placing signboard, sign of speed limit in construction area, placing plastic signal (according to the Ministry of Transport regulations) in construction area and parking crane area to perform column erection + Do not to erect, lift and lower the equipment in places near traffic roads (if the road was occupied by the crane) during the peak traffic + When working in the night, it is necessary to equip the signal lights (red color) in the construction area and the places where the crane parked + In the end of working day, crane must be brought to the gathering yard as prescribed + Cleaning up to return the traffic ground VI EARTHING FOR PREVENTION OF INDUCED CURRENT Earthing for prevention of induce current must comply with Circular 03/2010/TTBCT providing on a number of requirements on protecting the high voltage power grid works, Decree 81/2009/ND-CP dated October 12, 2009 of the Government amending and supplementing a number of articles of Decree No 106/2005/ND-CP Earthing for prevention of induced current is performed as follow: Scope of work: 25m long from the power grid’s security corridor to external edge of wires CONSTRUCTION METHOD PAGE 75 Package ADB-HNPC-TCTD-P01: Designing, supplying, installing and operating underground cable 110kV Component : Underground cable 110kV Thanh Cong - Thuong Dinh Project : Hanoi and Ho Chi Minh City Power Grid Development Requirements on earthing work: - Houses and buildings with metal roofs: Earthing work is performed for only roofs and not for metal structures located below roofs - Houses and buildings without metal roofs: Earthing work is performed for all metal structures such as partitions, enclosing walls, beams, girders, door frames - Earthing work is performed for metal structures located outside houses and buildings such as iron frames, sheet metals, TV antennas, clothes line Earthing fittings: - Earthing rods are made from round bars with a diameter of more than 16 mm (or square iron with a similar cross section) or angle iron with 40x40x4mm; 1,0m in length Rods are vertically driven into the ground, rod heads exposed to the air are 0.1-0.15 m long (note: the location of driven rods must not impact owners and users of houses and buildings) Eathing rods must not be coated with insulations At places vulnerable to corrosion, earthing rods must be plated with zinc or copper - Earthing conductors are made from round bars with a diameter of more than 6mm; strip steel of 24x4mm; flexible copper wires with cross section of more than 16mm2; the earthing conductors made from steel must be plated with zinc or coated with anti-corrosive paint; they are connected with air-exposed earthing rods and metal structures to be grounded, using bolts and by welding - Earthing rods may be replaced with natural earth electrode such as metal structures situated under the ground of houses and buildings Cost of earthing work: The Contractor performs surveying and determining detailed volume of earthing work items for prevention of induced current and for safe implementation Such cost is included in the bid price CONSTRUCTION METHOD PAGE 76 Package ADB-HNPC-TCTD-P01: Designing, supplying, installing and operating underground cable 110kV Component : Underground cable 110kV Thanh Cong - Thuong Dinh Project : Hanoi and Ho Chi Minh City Power Grid Development CONSTRUCTION METHOD PAGE 77 Package ADB-HNPC-TCTD-P01: Designing, supplying, installing and operating underground cable 110kV Component : Underground cable 110kV Thanh Cong - Thuong Dinh Project : Hanoi and Ho Chi Minh City Power Grid Development CHAPTER VII ENVIRONMENTAL MONITORING AND MANAGEMENT PLAN For preventing negative impacts on the environment and local community and mitigating the same on the environment during construction and service, the Contractor shall strictly perform mitigation measures During work execution, the Contractor shall implement the environmental monitoring and management plan by using mitigation measures against work items to be surveyed and assessing the environmental impact mitigation in certain places Details of environmental monitoring and management and report are as follow: A MONITORING SCHEDULE Internal monitoring Stage/ environmental NO issue Works item to be surveyed and environmental impact mitigation method Location Method Cost Responsible party Acquisition of route corridor Site acquisition complies with Along Article 5, Decree106/2005/ND-CP route dated August 17, 2005 of the Government Once a month Included in Contractor the bid price Temporary road Using the existing road and working Along the Observation Once a month with the local authority and agency transport and discussion to obtain permission for road use road with the local and performing improvements authority and against it to be in original state after agency construction and reporting Site Included in Contractor the bid price CONSTRUCTION METHOD the Observation Periodicity PAGE 78 Package ADB-HNPC-TCTD-P01: Designing, supplying, installing and operating underground cable 110kV Component : Underground cable 110kV Thanh Cong - Thuong Dinh Project : Hanoi and Ho Chi Minh City Power Grid Development Stage/ environmental NO issue Works item to be surveyed and environmental impact mitigation method Location Method Periodicity Cost Responsible party Manager Landslide Detailed construction method for cable trenches, cable joint pits, antilandslide must be approved by the Site manager according to ambient conditions before construction Surplus soil and stone and waste Waste solid and stone arising out of Waste site construction of foundations and columns must be transported and disposed according to local requirements Observation Once a month and discussion with the local authority Included in Contractor the bid price Air pollution Construction registered Observation Before and register vehicles permit operate Site Included in Contractor the bid price vehicles must Location of construction and along the transport road be On Site Observation Once a month Included in Contractor and based on and after a the bid price work survey heavy rain data Observation Materials trucks (sand, stone, etc.) Departure must be covered with canvas to and arrival avoid falling materials Regularly location watering the area with dust At storage Observation Open storages are covered with yard canvas and nylon CONSTRUCTION METHOD PAGE 79 on Every week In dry season and strong wind Package ADB-HNPC-TCTD-P01: Designing, supplying, installing and operating underground cable 110kV Component : Underground cable 110kV Thanh Cong - Thuong Dinh Project : Hanoi and Ho Chi Minh City Power Grid Development Stage/ environmental NO issue Obstructing traffic Security order and environmental hygiene Works item to be surveyed and environmental impact mitigation method Location Method Periodicity Cost Preparing the construction method Location of Observation for passing obstacles, working with obstacles And the road governing agency, etc discussion reporting Party A’s division to with obtain a construction permit governing agency Only construction within permitted Adjacent ditch and Site, no temporary encroachment channel area At cable Included in Contractor stretching the bid price Working with the local authority to Location of Observation carry out register of temporary residence residence against staffs and workers for hygiene and landscape assurance Once a week At excavation and backfilling of cable trench, site leveling Included in Contractor the bid price B REPORTING PROCEDURE Environmental monitoring and management is carried out upon the Employer’s request as follow: - This work must comply with the Government’s Decrees + Decree 59/2015/ND-CP of the Government on construction project management dated June 18, 2015 CONSTRUCTION METHOD Responsible party PAGE 80 Package ADB-HNPC-TCTD-P01: Designing, supplying, installing and operating underground cable 110kV Component : Underground cable 110kV Thanh Cong - Thuong Dinh Contractor records activities in the log of environmental Project - The construction : Hanoi and Ho Chi Minh City Power Grid Development monitoring and management plan according to the above schedule, in which management of machinery and equipment must be included - The log of environmental monitoring and management plan must indicate achievements attributable to implementation of such plan - The supervision must be performed with the periodicity as stated in the environmental monitoring and management plan and submitted to the Project Management Unit before the 15th of each month The Contractor shall report the environmental monitoring according to the following report form: CONSTRUCTION METHOD PAGE 81 Package ADB-HNPC-TCTD-P01: Designing, supplying, installing and operating underground cable 110kV Component : Underground cable 110kV Thanh Cong - Thuong Dinh Project REPORT FORM : Hanoi Ho Chi Minh City Power GridMONITORING Development OF and ENVIRONMENTAL AND MANAGEMENT AT THE STAGE OF CONSTRUCTION Report on environmental monitoring and management Project name : …………………………………………………………………………………………………………… Location: …………………………………………………………………………………………………………… Contractor’s name : …………………………………………………………………………………………………………… Monthly report (yes/no) : ………………………………………………………………………………………………… Report of independent Supervising Consultant (yes/no): ………………………………………………………………………… Monitoring time: ………………………………………………………………………………………………………… Location of monitoring: ………………………………………………………………………………………………………… Person-in-charge’s assessment/Feedback of the community NO Item Application of mitigation measures influences vegetation and habitat due to land acquisition Application of mitigation measures influences the residential area when land is acquired Situation of cutting down trees across the transmission line’s corridor Pollution caused by dust, vehicle exhaust, construction machines running on the transport route and on Site Noise and vibration generated from the Site and the surrounding area Collection and treatment of solid waste generated from worker’s activities and construction solid waste Erosion, washing, sedimentation and landslide caused by excavation and back-filling CONSTRUCTION METHOD PAGE 82 Remark/Proposal Package ADB-HNPC-TCTD-P01: Designing, supplying, installing and operating underground cable 110kV Component : Underground cable 110kV Thanh Cong - Thuong Dinh Project : Hanoi and Ho Chi Minh City Power Grid Development NO Item Soil, air and water pollution due to oil leak from construction machinery and equipment Collection and treatment of solid waste generated from worker’s activities and construction wastewater 10 Damage degree of traffic system due to transport of materials and equipment 11 Health and safety measures for construction and workers’ camps 12 Risk of fire in Site and application of precautions 13 Performance of labor safety measures 14 Management of equipment and construction materials 15 Collection and cleaning of waste upon completion of work items at each location of construction 16 Environmental impacts caused by construction workers Person-in-charge’s assessment/Feedback of the community Remark/Proposal 17 Other Preparing unit: …………………………………………………………………………………………………………… Preparing person: ………………………………………………Position: ………………………………………………… CONSTRUCTION METHOD PAGE 83 Package ADB-HNPC-TCTD-P01: Designing, supplying, installing and operating underground cable 110kV Component : Underground cable 110kV Thanh Cong - Thuong Dinh Project : Hanoi and Ho Chi Minh City Power Grid Development CHAPTER VII ACCEPTANCE FOR PAYMENT AND DELIVERY OF THE WORKS I ACCEPTANCE OF WORK ITEMS - Upon completion of each work item at each construction stage, we carry out acceptance and seek the approval from the Employer’s Engineering Supervisor on moving to other item according to each part of work item - The Contractor shall make an acceptance schedule for each stage and submit the Employer for setting up an accpetance committee as required - Contractors, Party A’s Engineering Supervisor, Design Consultant shall monitor work items through the construction daily log during the whole construction process - Actual volume completed is presented on as-built drawings, construction log, completed volume acceptance minutes with certification of Party A’s Engineering Supervisor and Design Consultant as a basis for future final accounting - Completed volume acceptance documents are written according to Decree No 15/2013/ND-CP dated February 06, 2013 of the Government on project quality management and Circular No 10/2013/TT-BXD dated July 25, 2013 of Ministry of Construction detailing a number of articles of project quality management and applicable provisions II ACCEPTANCE FOR DELIVERY OF THE WORKS: - Upon completion of the works and eligibality to power supply, the Employer, together with the Contractor, the designing firm, the operational management firm shall carry out acceptance and write the minutes of completion and final acceptance for service - Perform delivery of project documents - Provide final accounting CONSTRUCTION METHOD PAGE 84 ... pavement in the original condition *Treatment of cross intersection in the cross intersections: Make layout of the construction site, appropriate traffic division Place signs and prohibition signs... Thuong Dinh Project : Hanoi and Ho Chi Minh City Power Grid Development - - Depth of pile driving, number of pile sections and pile connectors Pile driver, driving capacity, driving journey, piston... authorities for the technical characteristics of the equipment For hydraulic pile driver, the following technical specifications are required: + Oil pumping flow + Maximum oil pumping pressure + Piston