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HANOI PEOPLES COMMITTEE HANOI METROPOLITAN RAILWAY MANAGEMENT BOARD (MRB) DAELIM INDUSTRIAL CO., LTD METHOD STATEMENT PROJECT: HANOI PILOT LIGHT METRO LINE Section Nhon - Hanoi Railway Station PACKAGE: LINE-ELEVATED SECTION PACKAGE NUMBER: HPLMLP/CP-01 METHOD STATEMENT FOR SHORED EXCAVATION Location: Tu Liem, Cau Giay, Dong Da and Ba Dinh – Ha Noi City PROJECT IMPLEMENTATION CONSULTANT: SYSTRA S.A January, 2015 Project Reference: DLM-IMP-PPG-WVO-J07-00001-E-1A METHOD STATEMENT PROJECT: HANOI PILOT LIGHT METRO LINE Section Nhon - Hanoi Railway Station PACKAGE: LINE-ELEVATED SECTION PACKAGE NUMBER: HPLMLP/CP-01 METHOD STATEMENT FOR SHORED EXCAVATION Location: Tu Liem, Cau Giay, Dong Da and Ba Dinh – Ha Noi City Hanoi, 03 January, 2015 HANOI METROPOLITAN RAILWAY MANAGEMENT BOARD (MRB) CONTRACTOR (DAELIM) PROJECT IMPLEMENTATION CONSULTANT (SYSTRA S.A.) Hanoi Pilot Light Metro Project Method statement for shored excavation Contractor Approval / Revision Record Sheet Revision Date Subject of issue / Revision Authors 1A 03/01/2015 First Issue Nguyen Thai Vu Revision N°: 1A Name Date Prepared by NGUYEN THAI VU 03/01/2015 Checked by OH SEUNG JONG 03/01/2015 Validated by SEO YOUNG HWA 03/01/2015 Signature Contractor specific comments: Doc N° DLM-IMP-PPG-WVO-J07-00001-E-1A Page 3/36 Hanoi Pilot Light Metro Project Method statement for shored excavation CONTENTS INTRODUCTION OF PROJECT 1.1 INTRODUCTION SCOPE OF WORK 2.1 GENERAL 2.2 SCOPE 2.3 REFERENCE 7 CONSTRUCTION PROCEDURE .8 3.1 QUANTITY OF WORK 3.2 REFERENCE TO BORE HOLE 3.3 SCHEDULE OF WORK 17 21 PERSONNEL ORGANIZATION 22 4.1 PERSONNEL ORGANIZATION FOR MAIN CONTRACTOR 4.2 PERSONNEL ORGANIZATION FOR SUB – CONTRACTOR SPECIAL BRIDGE 4.3 PERSONNEL ORGANIZATION FOR SUB – CONTRACTOR TYPICAL BRIDGE 22 23 24 MATERIALS, EQUIPMENT AND MANPOWER 25 5.1 MATERIALS 5.2 EQUIPMENT 5.3 MANPOWER 25 25 26 CONSTRUCTION METHOD 27 6.1 CONSTRUCTION FLOW CHART 27 6.2 DETAIL OF CONSTRUCTION METHOD 28 6.2.1 MOBILIZATION AND PREPARATION WORKS 28 6.2.2 CONSTRUCTION OF COFFERDAM (STEEL SHEET PILES) 28 6.2.3 CONSTRUCTION OF COFFERDAM (STEEL SHEET PILES) 29 6.2.3.1 Excavation Stage 1: About install struts and wales 29 6.2.3.2 Excavation Stage 2: Excavation by machine until design level and hauling out of excavated material 30 6.2.3.3 Excavation Stage 3: Trimming and leveling work .30 6.2.3.4 Construction for temporary drainage system (Dewatering) .30 6.2.3.5 Cleaning up site 30 QUALITY CONTROL 31 HEALTH, SAFETY AND ENVIRONMENT CONTROL 31 8.1 HEALTH AND SAFETY CONTROL 8.2 ENVIRONMENT CONTROL 8.3 HAZARD ANALYSIS 31 32 32 TRAFFIC CONTROL 33 10 APPENDIX 33 10.1 APPENDIX 1: METHOD DRAWING 34 10.1.1 SHORED EXCAVATION METHOD DRAWING FOR TYPICAL BRIDGE 34 10.1.2 SHORED EXCAVATION METHOD DRAWING FOR SPECIAL BRIDGE 34 10.2 APPENDIX 2: INSPECTION AND TESTING PLAN 35 10.3 APPENDIX 3: TYPICAL SCHEDULE FOR SHORED EXCAVATION OF 01 PILE CAP 36 Doc N° DLM-IMP-PPG-WVO-J07-00001-E-1A Page 4/36 Hanoi Pilot Light Metro Project Method statement for shored excavation Abbreviations MRB PIC DLM Hanoi Metropolitan Railway Management Board Project Implementation Consultant (SYSTRA S.A.) Daelim Industrial Co., Ltd Project References Ref N° Ref ID number DLM-IMP-PPG-WVO-J07-00001-E-1A Doc N° DLM-IMP-PPG-WVO-J07-00001-E-1A Ref description Method statement for shored excavation Page 5/36 Hanoi Pilot Light Metro Project Method statement for shored excavation INTRODUCTION OF PROJECT 1.1INTRODUCTION Hanoi Pilot Light Metro Line, section Nhon - Hanoi Railway Station is a major project fo r Hanoi City According to the Hanoi Transportation Master Plan till 2020, total length of HPLML (Line 3) shall reach 21,5km from Nhon to Hoang Mai.The first phase of this line, and part of this Contract is from Nhon to Hanoi Railway Station, with about 8.5 km elevated section and 4.0 km underground section This line includes 12 stations (with elevated and underground stations) The Depot is located at Nhon with area of 150,550m2 The CP01 Contract’s work scope is Viaduct Line at Elevated Section, including the construction of viaduct structures which link along the National Road No32, Ho Tung Mau, Xuan Thuy, Cau Giay and interfaces with underground section at the beginning of Kim Ma Street The contract shall be completed and within 30 months from the date of the Commencement Date Both metro and structure alignment follow the current and/or planned median road Viaduct structures are divided into standard viaducts which cover most of the elevated section and special viaducts where long or special spans are required to pass over major constraints (2nd Ring Road, 3rd Ring Road, Nhue River) Other non-typical structure consists in Cross Over (metro line requires switches), ramps to depot and underground sections and Y-bridge (branches off to depot) The overview of the project is shown in photo below: Overview of project SCOPE OF WORK 2.1GENERAL Structure excavation work of Project will be carried out within the narrow area and with the great depth of excavated hole Therefore, Shored excavation method will be applied to ensure stability of excavation hole for structure construction Shored Excavation shall be undertaken in accordance with clause “3.4 - Shored excavation, Part II, Chapter II-2” of Technical Requirement This method is generally applied to Shored excavation to the design bottom elevation for all pile caps using shoring system Doc N° DLM-IMP-PPG-WVO-J07-00001-E-1A Page 6/36 Hanoi Pilot Light Metro Project Method statement for shored excavation This method also includes disposal of unsuitable excavated material, dewatering works and related works to be free from the accumulation of ground water and artificial runoff water inside excavated area Shored Excavation shall be done in accordance with the perimeters and slope as indicated on the approved working drawing 2.2SCOPE The Contractor shall set up and submit method of shored excavation The Contractor can adjust method for shored excavation in accordance with the actual condition on the site or at the direction of Consultant Engineer All adjustments will be reviewed and approved by the Consultant Engineer, Employer After obtaining consent from the Consultant Engineer, Employer, the Contractor will carry out shored excavation Shored excavation part including: • Shored excavation for pilecap type I (Standard pile cap) • Shored excavation for pilecap type II (Cantilever pile cap) • Shored excavation for pilecap type III (Special pile cap) The Contractor will use method of excavation works of foundation pit by excavator and manpower 2.3REFERENCE Reference document: - Contract Package 04/2014/HD-TCXD, PART II - Chapter II-2, Section Earthwork - Contract Package 04/2014/HD-TCXD, PART II - Chapter II-2, Sub-Section 3.4.Shored excavation -Contract Package 04/2014/HD-TCXD, PART II - Chapter II-2, Sub-Section 3.3.Common excavation - Contract Package 04/2014/HD-TCXD, PART II - Chapter II-2, Sub-Section 3.5 Preparation and inspection of foundations - Contract Package 04/2014/HD-TCXD, PART II - Chapter II-2, Sub-Section 3.8 Grade preparation - Contract Package 04/2014/HD-TCXD, PART II - Chapter II-2, Sub-Section 3.9 Water Control - Construction Management Plan, document No : DLM – IMP – PPG – ZCO – J00 – 00001 – E - Quality Plan, document No : DLM – IMP – PPG – ZPQ – J00 – 00001 – E - Delivery Management Plan, document No: DLM – IMP – PPG – ZPO – J00 – 00001 – E - Traffic Management Plan, document No: DLM – IMP – PPG – ZPO – J00 – 00004 – E - H&S Management Plan, document No: DLM – IMP – PPG – ZSO – J00 – 00003 – E - Environment Management Plan, document No: DLM – IMP – PPG – ZSO – J00 – 00002 – E - Security Management Plan, document No: DLM – IMP – PPG – ZSO – J00 – 00001 – E Doc N° DLM-IMP-PPG-WVO-J07-00001-E-1A Page 7/36 Hanoi Pilot Light Metro Project Method statement for shored excavation CONSTRUCTION PROCEDURE 3.1QUANTITY OF WORK The estimated quantity is as followings table Below quantity is only reference Final quantity shall be calculated in accordance with approved working drawing Topographic survey of original ground which had been approved shall be applied to calculate the quantity for structure excavation Doc N° DLM-IMP-PPG-WVO-J07-00001-E-1A Page 8/36 Hanoi Pilot Light Metro Project Method statement for shored excavation Dimension of Excavation No Type of bridge Pier 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical P21 P35 P36 P37 P38 P39 P40 P41 P42 P43 P44 P45 P46 P47 P48 P49 P50 P51 P52 P53 P54 P55 P56 P57 P58 P59 P60 P61 P62 P63 P64 P65 P66 P67 P68 P69 P70 P79 P80 P81 Length (m) 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 No Type of bridge Pier Dimension of Excavation Doc N° DLM-IMP-PPG-WVO-J07-00001-E-1A Width (m) 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 Depth of Excavation (m) Excavation Volume (m3) 1.75 2.49 2.35 2.25 1.99 1.90 1.93 2.11 2.23 2.39 2.40 2.30 2.47 2.54 2.50 2.53 2.29 2.46 2.45 2.19 1.95 2.01 2.04 2.12 2.12 2.11 1.88 1.61 1.48 1.78 1.96 1.99 1.97 2.04 2.07 2.07 2.17 2.32 2.28 2.09 80.69 114.91 108.43 103.81 91.79 87.62 89.01 97.34 102.88 110.28 110.74 106.12 113.98 117.22 115.37 116.76 105.66 113.52 113.06 101.03 89.94 92.71 94.10 97.80 97.80 97.34 86.70 74.22 68.20 82.08 90.40 91.79 90.86 94.10 95.49 95.49 100.11 107.05 105.20 96.46 Depth of Excavation (m) Excavation Volume (m3) Page 9/36 Hanoi Pilot Light Metro Project 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical Typical P82 P83 P84 P85 P86 P87 P88 P89 P90 P91 P92 P93 P94 P95 P96 P97 P98 P99 P100 P101 P102 P103 P104 P105 P106 P107 P108 P109 P110 P111 P112 P113 P114 P115 P116 P117 P118 P119 P120 P129 No Type of bridge Pier Method statement for shored excavation Length (m) 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 Width (m) 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 Dimension of Excavation Length (m) Doc N° DLM-IMP-PPG-WVO-J07-00001-E-1A Width (m) 1.91 2.18 2.18 2.18 2.18 2.18 2.18 2.18 2.18 2.18 2.18 2.18 2.18 2.18 2.18 2.18 2.18 2.18 2.18 2.18 2.18 2.18 2.18 2.18 2.18 2.18 2.18 2.18 2.18 2.18 2.18 2.18 2.18 2.18 2.18 2.18 2.36 2.16 2.19 1.76 88.09 100.57 100.57 100.57 100.57 100.57 100.57 100.57 100.57 100.57 100.57 100.57 100.57 100.57 100.57 100.57 100.57 100.57 100.57 100.57 100.57 100.57 100.57 100.57 100.57 100.57 100.57 100.57 100.57 100.57 100.57 100.57 100.57 100.57 100.57 100.57 108.90 99.65 101.03 81.15 Depth of Excavation (m) Excavation Volume (m3) Page 10/36 Hanoi Pilot Light Metro Project Method statement for shored excavation PERSONNEL ORGANIZATION 4.1PERSONNEL ORGANIZATION FOR MAIN CONTRACTOR Doc N° DLM-IMP-PPG-WVO-J07-00001-E-1A Page 22/36 Hanoi Pilot Light Metro Project Method statement for shored excavation 4.2PERSONNEL ORGANIZATION FOR SUB – CONTRACTOR SPECIAL BRIDGE GIÁM ĐỐC ĐIỀU HÀNH DỰ ÁN Mr.Lê Lệnh Bắc Phone: 0913253582 Construction Manager/ Chỉ Huy Trưởng Mr Lê Thảo Tâm Phone: 0987.520.820 Designer/ Thiết kế Mr Lê Minh Trà Phone: 0912-337-176 Mr Bùi Trần Hà Phone: 0983-718-345 Design Team/ Tổ Thiết kế Construction Team/ Bộ phận thi công Mr Trần Hữu Thắng Phone: 0983-899-315 QA, QC/ Quản lý chất lượng Mr Ngô Thế Quỳnh Phone: 0916-042-060 QA, QC Team/ Tổ quản lý chất lượng Mr Cấn Mạnh Hùng Mr Lê Văn Long Phone: 0947-211-268 Doc N° DLM-IMP-PPG-WVO-J07-00001-E-1A Sheet pile Team/ Tổ cọc ván thép Excavation Team/ Tổ thi công đào Planning,QS Team/ Bộ phận Kế hoạch, khối lượng Mr Lê Thăng Quân Phone: 01683-636-867 Drainage Team/ Tổ thi công thoát nước tạm Mechanical Team/ Bộ phận máy thi công Mr Cao Tiến Sơn Phone: 0985-320-691 Clinic Team/ Tổ Y tế Surveyor Team/ Đội Trắc đạc Mr Khuất Hữu Thuận Phone: 0972-796-481 S.H.E/ Bộ phận An tòan, Sức khỏe, Môi trường Mr Nguyễn Quang Hiếu Phone: 0919-780-066 Mr Nguyễn Thanh Thản Phone: 0913-560-427 Safety Team/ Tổ An toàn Mr Phạm Ngọc Tiến Phone: 01686-539-171 Traffic Assurance Team/ Tổ Đảm bảo giao thông Page 23/36 Hanoi Pilot Light Metro Project Method statement for shored excavation 4.3PERSONNEL ORGANIZATION FOR SUB – CONTRACTOR TYPICAL BRIDGE GIÁM ĐỐC ĐIỀU HÀNH DỰ ÁN Mr.Nguyễn Tuấn Anh Phone: 0989059379 Email: tuananhsd73@gmail.com PHÓ GIÁM ĐỐC BAN ĐIỀU HÀNH Phụ trách quản lý thi công, ATLĐ, đảm bảo giao thông Mr: Trần Ngọc Quý Phone: 0979267723 Email: ngocquyc14@gmail.com PHÓ GIÁM ĐỐC BAN ĐIỀU HÀNH Phụ trách kế hoạch, toán, kỹ thuật Mr: Đào Đức Huynh Phone: 0913060752 THIẾT KẾ Mr Nguyễn Thắng An Phone:0989643926 Mr Lê Văn Tuấn Phone:0972405191 QUẢN LÝ CHẤT LƯỢNG Mr Phạm Xuân Nghĩa Phone: 0912774678 Mr Đàm Quang Chiến Phone:0984322270 BỘ PHẬN THI CÔNG Mr Nguyễn Trung Kiên Phone: 0979898568 Mr Nguyễn Văn Đô Phone:0918488598 BỘ PHẬN KẾ HOẠCH, KHỐI LƯỢNG Mr Bùi Quang Vinh Phone: 0949393492 Mr Trần Văn Cường Phone:0972405191 BỘ PHẬN MÁY THI CÔNG Mr Đỗ Đường Tú Phone: 0974112422 ĐỘI TRẮC ĐẠC Mr Trương Quốc Ninh Phone: 0904545744 Mr Nguyễn Văn Hùng Phone:0936672916 NHÓM AN TOÀN SỨC KHỎE , MÔI TRƯỜNG Mr Trương Công Thịnh Phone: 0979032579 Mr Nguyễn An Quang Phone:01689615196 Mr Nguyễn Sỹ Thường Phone:016689912487 Doc N° DLM-IMP-PPG-WVO-J07-00001-E-1A Page 24/36 Hanoi Pilot Light Metro Project Method statement for shored excavation MATERIALS, EQUIPMENT AND MANPOWER The list of equipment and worker for one team of shored excavation is shown as followings Detail of equipment and workers should be submitted separately in order to be checked and approved by the Engineer before commencement of bored piling work 5.1MATERIALS List of Materials for one team of shored excavation No Items Qty Description Sheet pile 01 Set Larsen IV, L=6~8m Frame strut and wale 01 Set H400x400 & H250x250 Remark Driving of sheet pile work (profile of sheet pile, wales and struts will be submitted before constructing) 5.2EQUIPMENT List of equipment are shown as below (for one team of shored excavation) That equipment will be submitted to the Engineer for approval before construction List of Equipment for one team of shored excavation No Items Qty Description Excavator 01 Pc 0.6~1.2m3 bucket 01 Pc 40 ton 01 Set KGK-130 or equivalent Crane Static sheet machine Dump truck 01 Pc 10~25m3 Diesel Generator 01 Pc 100~250 KVA Pump 01 Pc 20~50 m3/hours Total station/ leveling machine 01 Set Lighting systems 01 Set Welding machine 01 Set 10 Bar cut machine 01 Set 11 Ladder 01 Set pile compression Remark Above stated schedule of equipment shall be increased in quantity if required and necessary Above equipment could be replaced by equivalent equipment depend on condition of the Contractor or site condition Doc N° DLM-IMP-PPG-WVO-J07-00001-E-1A Page 25/36 Hanoi Pilot Light Metro Project Method statement for shored excavation 5.3MANPOWER List of worker for one team of shored excavation No Teams Q’ty Description Remarks Foreman To control working party Skilled Worker (1) To survey, excavation, skill worker Skilled Worker (2) To driver dump truck Common Worker To excavation Indirect manpower No Position No.of person Duty Remarks Construction manager, Deputy Construction manager General management Divided to shifts Site engineer Incharge of technical, supervision Divided to shifts Planning, QS Incharge planning, QS QC Quality control Divided to shifts Surveyor Surveying Divided to shifts Geological engineer Geological matters S.H.E staff S.H.E Medical staff Health care Equipment engineer Equipment management 10 Design Engineer 11 Traffic management staff Control traffic 12 Experimental staff Testing Doc N° DLM-IMP-PPG-WVO-J07-00001-E-1A Divided to shifts Divided to shifts Page 26/36 Hanoi Pilot Light Metro Project Method statement for shored excavation CONSTRUCTION METHOD 6.1CONSTRUCTION FLOW CHART Sequence of Work Preparation, mobilization Description of checking and Inspection * Confirm approved construction design drawing for cofferdam system * Acceptance utility works and temporary works * Acceptance of equipment, material and manpower Establish limit of work * Confirm the topographic survey of original ground (trial pit, remove curb, tree….) * Setting survey marking poitns Driving sheet pile for cofferdam * Checking location of sheet pile * Checking the elevation of bottom and top of cofferdam Excavation 1st stage : to about install strut and wale Install strut and wale Excavation 2nd stage : Excavation by machine until design level and hauling out of excavated material Excavation 3rd stage : Trimming and leveling work Temporary drainage construction Structure work Doc N° DLM-IMP-PPG-WVO-J07-00001-E-1A * Checking the working condition and the excavation deep * Checking the elevation and the instalation work according with working drawing * Checking joint strut and wale * Inspection for grade preparation * Checking elevation of excavation * Checking stability of struts and wales * Acceptance dimension and elevation of bottom excavation * Checking the location of pump pit and drainage * Method will be submitted separately Page 27/36 Hanoi Pilot Light Metro Project Method statement for shored excavation 6.2DETAIL OF CONSTRUCTION METHOD 6.2.1 MOBILIZATION AND PREPARATION WORKS a) Mobilization of equipment and manpower shall be approved by the Consultant in according with section 1.1 Part II, Chapter II-2 “Mobilization” of Employer’s Requirement b) Working drawing and design calculation of cofferdam shall be approved by the Consultant c) Temporary drainage shall be mentioned in the working drawing and approved by the Consultant to prevent flooding of excavation hole d) Notify the Engineer sufficiently in advance of the beginning of any excavation so that cross sectional elevations and measurements can be taken of the undisturbed ground The existing ground adjacent to the structure shall not be disturbed without the permission of the Engineer e) The ground level and road structure shall be inspected by Engineer in topographic survey and shall be mentioned in report of topographic survey 6.2.2 CONSTRUCTION OF COFFERDAM (STEEL SHEET PILES) a) Establish limit of cofferdam system by survey marking: Firstly, The contractor will establish the limit of cofferdam system Limit of cofferdam system will be carried out with minimum 1m clearance from each side of the structure to keep enough area for formwork and mobility of the workers as well as the arrangement of drain and canal and pumping pit However, in cases where the cofferdam is to be constructed on narrow area and not enough space for construction, near existing structures, where area is limited, less than 1m clearance of steel sheet piles from the side of structure shall be proposed Before driving steel sheet pile, asphalt concrete layer of existing road shoulder be removed Survey marking PLAN VIEW Survey marking Guide frame Interior edge of sheet pile Edge of pile cap Survey marking Survey marking Survey marking PLAN VIEW Survey marking Guide frame Interior edge of sheet pile Edge of pile cap Survey marking Survey marking b) Construction of cofferdam shall be carried out step by step Doc N° DLM-IMP-PPG-WVO-J07-00001-E-1A Page 28/36 Hanoi Pilot Light Metro Project Installing reaction stand counter weight and silent piler Driving 3rd steel sheet pile Method statement for shored excavation Driving 1st steel sheet pile Driving 2nd steel sheet pile Next driving sheet piles c) During driving sheet pile, guide frame shall be used to keep alignment (that guide frame will be fabricated by steel bar or rope for establish the limit of cofferdam system and direction for silent piler during carry out driving steel sheet pile) and to use the plumb or theodolite machine with two direction 90 degree for vertical of sheet pile 6.2.3 CONSTRUCTION OF COFFERDAM (STEEL SHEET PILES) 6.2.3.1 Excavation Stage 1: About install struts and wales a) After driving sheet pile is finished, excavation work shall be carried out by excavator in according with working drawing which approved by the Consultant b) Excavation shall be carried out layer by layer to have sufficient time for the installation and setting of wales and struts to support inside cofferdam Depths of excavation shall be carefully checked following the criteria and sequence for the construction of cofferdam as defined by design calculation Wale and struts shall be installed as shown on working drawing c) Excavation on each layer shall be temporarily stopped below the elevation of the struts and wales in accordance with the design calculation Excavation shall only proceed to the next level after installation of wales and struts d) During excavation work, excavated materials shall be removed immediately at the area to maintain space for the mobility of the equipment Excavated materials found to be suitable for backfilling shall be hauled to a designated stock pile area Unsuitable material shall be Doc N° DLM-IMP-PPG-WVO-J07-00001-E-1A Page 29/36 Hanoi Pilot Light Metro Project Method statement for shored excavation disposed by dump truck as well to specified disposal area And the dump truck shall be cleaned at washing area before go out to prevent dirty on the frontage road e) Signal man shall be assigned to support operator to avoid any accident due to narrow working area 6.2.3.2 Excavation Stage 2: Excavation by machine until design level and hauling out of excavated material a) Excavation shall only proceed to the next level after installation of wales and struts and get approved by Engineer according with approved working drawing b) In case the Excavation on the next level cannot be carried out by Excavator located outside the cofferdam, a small excavator shall be hoisted down inside the Cofferdam to carry out the excavation inside cofferdam c) During excavation work, excavated materials shall be removed immediately at the area to maintain space for the mobility of the equipment Excavated materials found to be suitable for backfilling shall be hauled to a designated stock pile area Unsuitable material shall be disposed by dump truck as well to specified disposal area And the dump truck shall be cleaned at washing area before go out to prevent dirty on the frontage road d) Signal man shall be assigned to support operator to avoid any accident due to narrow working area e) Pumping pit shall be provided at one or two corners A drain ditch with slope toward the pumping pit shall be provided around perimeter of the excavation pit Drain shall be constructed outside the perimeter of the lean concrete Location of pump pit shall be shown on approved working drawing Sufficient quantity of water pump shall be installed to prevent the accumulation of water inside cofferdam during excavation f) The drawing of process and sequence for shored excavation and installation of the sheet pile attached in item 10.1 for the detail 6.2.3.3 Excavation Stage 3: Trimming and leveling work a) After completion of excavation by machine, handwork is carried out to level of design pit bottom b) After completion of excavation, all loose and displaced material shall be removed, leaving a neatly and solid finished bed for construction of other structures Neatly and solid finished bed for construction of other structures c) Substructure and Base foundation limit shall be marked with survey stakes for setting up boundaries of lean concrete and pile cap d) Completed Excavation shall be Inspected and Approved by the Engineer prior to construction of lean concrete or permanent structure 6.2.3.4 Construction for temporary drainage system (Dewatering) a) Pumping pit shall be provided at one or two corners b) A drain ditch with slope toward the pumping pit shall be provided around perimeter of the excavation pit c) Drain shall be constructed outside the perimeter of the lean concrete d) Location of pump pit shall be shown on working drawing Sufficient quantity of water pump shall be installed to prevent the accumulation of water inside cofferdam during excavation e) Each Station will arranged the pit for gathering all the water which will be connected to public drainage system All Water from Excavated hole will be discharged to there 6.2.3.5 Cleaning up site After completion of shored excavation, all excess materials and rubbish shall be removed and disposed to specified disposal area, and clean the site Doc N° DLM-IMP-PPG-WVO-J07-00001-E-1A Page 30/36 Hanoi Pilot Light Metro Project Method statement for shored excavation QUALITY CONTROL The quality control during construction of shored excavation need to following QA&QC Management Plan: DLM – IMP – PPG – ZPO – J00 – 00001 – E “Inspection and Testing Plan” is attached in Item 10.2 HEALTH, SAFETY AND ENVIRONMENT CONTROL 8.1HEALTH AND SAFETY CONTROL The quality control during construction of shored excavation need to following H&S Management Plan, document No: DLM – IMP – PPG – ZSO – J00 – 00003 – E Prior and during the execution of Structure excavation work, basic safety precautions shall be implemented to work efficiently and to prevent any accident or casualty Particular item for safety control is as follows No Potential Risk Preventive Action • Prior to starting of excavation work, a joint meeting with relevant staffs has to be held for the purpose of general General explanation on whole contents of works as well as mutual implementation of efficient work • Safety Barricade will be set around excavation hole to prevent the falling accident Fall Accident • The safety belt must be used for the working at height such as on the boom of crane • 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 Accident by crane (lifting Capacity of each tool shall be instructed to worker and material) and Excavator confirmed before using • Stability of base of equipment shall be ensured, if necessary use steel plate • “Keep Out under lifting material” shall be instructed at site • To keep limit of speed (20km) at site • A vehicle shall be moved with assistance by signal in case it Traffic Accident moves backward • Setting signalman at entrance of site • Adequate earthling shall be installed for electric equipment such as welding machine and generator • Do not use machinery have working current over maximum loading of cable and CB • Suitable connection for outside electrical source Electric Accident • Welding work shall be carried out with adequate P.P.E such as facemask, glove, and apron • Do not perform welding job outside under the rain without cover • 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 Doc N° DLM-IMP-PPG-WVO-J07-00001-E-1A Page 31/36 Hanoi Pilot Light Metro Project Method statement for shored excavation 8.2ENVIRONMENT CONTROL Environmental control shall conform to the “Environment Management Plan” and is a part of this method statement 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 a) Excavated surplus soil will be removed completely from the site, and disposed at specified dispose area b) Waste Bentonite slurry shall be collected, safely handled and disposed to the designated disposal area arranged which is approved by the Engineer c) In case of slime truck, seal condition of tank will be checked carefully to prevent any leakage on the public road d) Working time for bored pile work will be made by 24 hours operation Special care for noise 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 These matters should be controlled on management stage by respective Construction Manager and on actual activity stage by respective Engineer 8.3HAZARD ANALYSIS Item Activity Preparation work - Make Schedule -Mobilisation equipment, labour and material - Assembly of silent piler and electric system Potential Hazards - Third party enter to the construction site and injury for third party -Violations and Risks, due to new labour did not have knowledge of EHS rules -Machinery, Equipment did not meet safety requirements - Accidents can happen during installation: + Pour + Slide + Plucking, cable broken Doc N° DLM-IMP-PPG-WVO-J07-00001-E-1A Preventive Measure Remark - Install the fence, gate, warning signs, safety board around working area All equipments shall be checked after mobilization to site, pay attention to warning device, lighting system, brake system - Everyone must be joint safety introduction and training before start work -Everyone follow Safety regulations and use PPE during working time -Ensure that all Equipment meet requirement before used (Not over 10year old, full safety protection, enough Documentation) - Arrange signal man during mobilization of equipment and during working time - All operator should have operating equipment licence - Checking load and capacity of crane before Page 32/36 Hanoi Pilot Light Metro Project Item Activity Method statement for shored excavation Potential Hazards + Thrilling - Electric shock - Common excavation - Driving Construction sheet pile sequence - Excavation Emergency respond Fire and Explosion Incident, accidental - Landslides, slide, flip during excavation - Electric shock and injury during operation of silent piler - People, material fall down to excavation hole There is no approach way for rescue the victim There is no effective method of fires fighting Victims are not timely provided Fist Aid or Medic Preventive Measure Remark start work - Check Ground condition and Lifting Gear before Lift Ascertain the standing position of the Equipment and excavation limit before digging -Check the electrical system before starting the job Barricade and warning signs around the pit, -The signal man take responsible for notice -Setup safety walk way and design access for Fire, ambulance - Have first aid station and medical kit bag at site - Have telephone number of nearest hospital and other agency: police, fire fighting TRAFFIC CONTROL The traffic control during construction of shored excavation need to following General traffic management plan: DLM – IMP – PPG – ZPO – J00 – 00004 – E Shore Excavation work will carry out in side of fence system of site Therefore, that activity will not affect to the traffic The contractor will be arranged flag man for control the traffic when mobilization and demobilization of equipment or material go out or in site 10 APPENDIX Doc N° DLM-IMP-PPG-WVO-J07-00001-E-1A Page 33/36 Hanoi Pilot Light Metro Project 10.1 Method statement for shored excavation APPENDIX 1: METHOD DRAWING 10.1.1 SHORED EXCAVATION METHOD DRAWING FOR TYPICAL BRIDGE 10.1.2 SHORED EXCAVATION METHOD DRAWING FOR SPECIAL BRIDGE Doc N° DLM-IMP-PPG-WVO-J07-00001-E-1A Page 34/36 Hanoi Pilot Light Metro Project 10.2 Method statement for shored excavation APPENDIX 2: INSPECTION AND TESTING PLAN 01 page attached Doc N° DLM-IMP-PPG-WVO-J07-00001-E-1A Page 35/36 Hanoi Pilot Light Metro Project 10.3 CAP Method statement for shored excavation APPENDIX 3: TYPICAL SCHEDULE FOR SHORED EXCAVATION OF 01 PILE 01 page attached Doc N° DLM-IMP-PPG-WVO-J07-00001-E-1A Page 36/36