Method statement of Underground Water Tank

CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation METHODSTATEMENT SMC Manufacturing (Vietnam) Factory-Phase Project SUB BUILDING 1- UNDERGROUND WATER TANKS Ref No: SMC-ACS-MS-22A-CCW-001 Rev 00 ACSC- CONG TY CO PHAN XAY LAP THUONG MAI SC-MS- Sub-building 1/Underground Water Tanks, Page CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation Revision History Revision 00 Date of issue 31-Jan-2016 Purpose of issue (approved/ revision) For Approval Submitted by ACSC Prepared by Reviewed by Approved by Name Le Long Hau Nguyen Hoang Trinh Nguyen Van Trung Position Deputy Site Manager Site Manager Project Manager Date Signature Approved by KOA Checked by QA-QC QA-QC HSE KDA Position Date Signature Date Signature Reviewed by Approved by Approved by Client Name Prepared by Reviewed by SC-MS- Sub-building 1/Underground Water Tanks, Position Page CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation Contents INTRODUCTION 1.1 PURPOSE The purpose of this Method Statement is to set up a policy for construction procedures and quality according to Contract Specifications Besides, it’s also outline the work instruction by which subbuilding (including underground water tank, trench line and cooling water tank) by mentioning typical structures such as bottom slab, wall and top slab of tank 1.2 DEFINITIONS: PROJECT PARTICULARS: Project name : SMC MANUFACTURING (VIET NAM) FACTORY-PHASE PROJECT Address : Long Duc Industrial Park, Long Duc Ward, Long Thanh District, Dong Nai Province, Viet Nam PARTY: Client/ Owner : SMC MANUFACTURING VIETNAM CO., LTD Contractor : KAJIMA OVERSEAS ASEA PTE LTD Responsible for the supervision of Contractors who will construct the podium and all related activities as outlined in this procedure SCOPE OF WORK The works to be carried out by Sub-Contractor (ACSC) and shall apply for works at Factory No.9 of SMC MANUFACTURING (VIET NAM) FACTORY-PHASE PROJECT Construction Reinforcement Concrete Structure works included: a Pile head treatment b Earth work c Formwork d Reinforcement Steel Rebar work e Concrete work Finishing works included: a Brick work b Plaster work c Painting work d Tiling work (Wall & Floor) Sub-building included: a Underground water tank, trench line, cooling water tank SC-MS- Sub-building 1/Underground Water Tanks, Page CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation BUILDING DESCRIPTION: Location: Underground Water Tank is located under Sub building No.1, next to Factory No.9 at the corner of Road No.D5 &N2-5 in Long Duc Industrial park as below Sub Building No.1 SC-MS- Sub-building 1/Underground Water Tanks, Page CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation Sub Building No.1 54000 A1 D B 22A-AR-201 500 6500 3000 1/20 EL+42.70 1/20 3000 EL+42.55 B AW AW SD AW SS AW SD AW AW SD AW SS AW SD Ø 10000 EL+42.55 10000 EL+42.55 A 22A-AR-201 AW AW AW AW AW AW A 22A -A R-201 LSD AW AW AW AW AW AW A 8500 EL+42.55 10000 10000 10000 10000 10000 10000 60000 B 22A-AR-201 3700~4200 3700~4200 E ? GFL±0 ? ? 3500 2800 150 42.55 150 ? GFL±0 10000 10000 10000 10000 10000 10000 60000 SC-MS- Sub-building 1/Underground Water Tanks, Page 42.55 CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation Underground water treatment tank + Dimension : L x W x H : 10 x 10 x 4.1 (m) + Structure : Reinforced concrete RC Concrete Volume (m3): Structure Dimension (m) Length 10.4 10.4 10.4 Bottom slab Walls Cover slab Wide 10.4 0.3 10.4 Concrete Volume (m3) Height 0.35 3.5 0.25 37.86 43.68 27.04 ORGANIZATION CHART 3.1 Organization Chart Project Manager NGUYỄN VĂN TRUNG (MP: 090 330 7742) nguyenvantrung@acsc.com.vn Site Manager NGUYỄN HOÀNG TRINH (MP: 090 291 1235) nghoangtrinh@acsc.com.vn Deputy Site Manager Deputy Site Manager NGUYỄN TRÍ KHOA (MP: 093 722 9680) LÊ LONG HẬU (MP: 093 232 5944) ngtrikhoa@acsc.com.vn haull@acsc.com.vn Site Engineer QC engineer NGUYỄN MINH TUẤN (MP: 098 314 5069) SC-MS- Sub-building 1/Underground Water Tanks, NGUYỄN VĂN HÀO (MP: 093 872 2730) PHAN QUỐC TRƯỜNG (MP: 098 314 5069) Page quoctruong@acsc.com.vn CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation Safety Supervisor Shop Drawing ĐỖ VŨ QUYỀN ANH (MP: 090 853 1908) HOÀNG VĂN HẢI (MP: 0122 761 2260) hoangvanhai@acsc.com.vn Construction Team PHƯƠNG PHƯƠNG VIỆT COMPANY 3.2 Assignment Position Deputy Site manager Site Engineer QA&QC Engineer Safety Supervision Factory No.1 NGUYỄN TRÍ KHOA Factory No.9 TRẦN AN TOÀN NGUYỄN MINH TUẤN NGUYỄN VĂN HÀO PHAN QUỐC TRƯỜNG ĐỖ VŨ QUYỀN ANH LÊ VĂN TUẤT BÙI CÔNG HUYNH NGUYỄN ANH ĐỨC PHẠM VĂN MẠNH FLOW CHART AND DIRECTION OF WORK The sequence of construction is shown at the following flowchart Excavation foundation Lean concrete RC Bottom slab RC Walls Formwork installation Steel rebar installation Casting concrete SC-MS- Sub-building 1/Underground Water Tanks, Page CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation Backfilling excavation Formwork installation Steel rebar installation Casting concrete RC Cover slab Removal of formwork Waterproofing work SCHEDULE Construction Schedule of water tanks is attached in Appendix-2 SPECIFIC STANDARD Reinforced Concrete Footings shall be carried out in accordance with the requirements of: - SMC MANUFACTURING (VIET NAM) FACTORY-PHASE PROJECT Specification for Footing works Current Vietnamese Construction Standards + TCVN 4447-2012 Vietnamese standard 4447-2012 (Earth works - construction, check and acceptance) + TCVN 5593 : 1991 Vietnamese standard 5593-1991 (Building engineering work - Permissible tolerances in geometry) + TCVN 1651-2008 Vietnamese standard 1651-2008 (Steel for the reinforcement concrete, part1+2) SC-MS- Sub-building 1/Underground Water Tanks, Page CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation - + TCVN 4453 – 1995 Vietnamese standard 4453-1995 (Concrete structures- codes for construction, check and acceptance) + TCXDVN 371 - 2006Vietnamese standard 371-2006 (Acceptance of constructional quality of building works) Related Materials approved by KAJIMA & Owner SC-MS- Sub-building 1/Underground Water Tanks, Page CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation TOOL & EQUIPMENT The equipment to be used for the construction of Footings is listed below Description Unit Q’t y Dump Truck 10 tons capacity Nos Transport the excavated soil Backhoe L= 4.5m, 0.70m3 capacity ea Excavation and backfill Submersible Pump inches, H=24m minimum Nos Stand by pump for dewatering Rammer Nos Compacting backfilled soil Plate compactor Nos Compacting for lean concrete Nos Vibrate concrete Concrete cutter Nos Use for cutting surplus pile head Portable steel cutter Nos Use for cutting steel bar Straightening machine Nos Use for reinforcing steel work Diameter 10mm : SD390, B15-B35 c/ Formwork: - Plywood, 18mm thickness reinforced with steel boxes 40x80x1.8 (mm) MATERIALS HANDLING, STORAGE AND DELIVERY - Concrete: Ready- mixed concretes are transported from batching plant to site in concrete truck (6 to 12 m3 capacity) The concrete must be delivered to site within maximum 60 minutes depend on the mix design of concrete supplier - Formwork: Formwork will be pre-fabricated then stocked on yard with protection of plastic cover Before installing, the formwork will be transported to site and placed near the excavation The surface of formwork must be clean of dirt, loose concrete and to be applied the release agent, if needed - Steel rebar: Delivered reinforcement bars are to be stored in stockyard nearby fabrication shop for convenient moving to the shop for cutting and bending Fabricated bars will be separately stored in the next area in the fabrication yard with tagged bundles to avoiding steel scraps mix-up Steel bars are stored on the steel platform or concrete blocks to prevent the contact of steel rebar with the ground All steel rebar are stocked in the steel yard with roofing and cover with plastic sheet to protect them with rain water Unloading reinforcement from trailer will be carried out by a suitable crane for lifting up reinforcement bundles Prior to fabrication of reinforcement, samples shall be taken from each batch of each size of each delivery and tested for compliance in accordance with Quality Control procedures - Other materials are keeping in storage and they are transported to the site work when they are in used 10 PREPARATION WORKS - Excavation foundation + Receiving the construction area transited by KOA + Receiving the coordinate, benchmark system from main Contractor (KOA) + Clearing the ground and remove any obstruction on the ground + Set up drainage system for rainwater and underground water inside and outside pit + Prepare internal road from the excavation to the stock yard of surplus soil + Setting out excavations with their center lines, dimension and marking on the ground - Casting lean concrete + Completing the excavation above design level about 100mm high + Drainage and pump water regularly, keep the pit dry + Trimming the surplus soil by hand to the design elevation + Compacting the base of foundation and testing, if required SC-MS- Sub-building 1/Underground Water Tanks, Page 11 CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation - Installation of form work + Completing lean concrete + Setting out and marking the gridlines and dimensions of footings on lean concrete surface + Pre-fabricate formwork + Cleaning and applying release agent on formwork surface, if required - Installation of rebar + Shape and dimension of rebar + Machine for fabricate rebar + Obtaining the approved Shop drawings - Casting concrete + Inspecting of rebar and formwork (record, pictures) + Prepare internal road for delivery concrete + Cleaning formwork, lean concrete's surface, pump water out of pit + Check finishing level of concrete + Covered starter rebar by PVC sheet before casting + Prepare bucket or slide for casting from top to bottom + Order the concrete SC-MS- Sub-building 1/Underground Water Tanks, Page 12 CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation 11 CONSTRUCTION METHOD 11.1 Excavation • Step 1: Survey and mark the foundation boundary on the ground included: Hand over & Take over Coordinate markers, Level markers, Gridlines, Survey Point & Temporary Benchmarks Set up Perimeter of area to be excavated and temporary access to excavations • Step 2: Excavate the soil: Using backhoe machines (0.7 m3) to excavate the soil Excavate with backhoe to the level 100mm higher than the design levels The slope of excavation is generally 75o The dimensions of excavation generally ≥ 500mm wider on each side of footing for worker operation and installation of formwork • Step 3: The remaining soil will be trimmed by hand to the design level • Step 4: Transportation and disposal surplus soil to designated location a Stocked soil: Surplus soil will be transported to the soil reservation location on the site designated by KOA For the back filling process, the soil is gathered as masses which less than 1.5m height and more than 1.5m distance far from the edge of opening hole It is temporary covered by canvas to prevent the dust and used for back filling process later The volume of soil stocked on construction area (for backfilling) are based on the excavated soil subtract the volume of casting concrete The volume of excavating soil, casting concrete are shown in table below: Excavated Soil volume (m3) No Excavation Waste water tank SC-MS- Sub-building 1/Underground Water Tanks, Level -4.35m Page 13 Q’ty Volume 60,41x13,27 Total (m3) 801,64 CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation The surplus soil will be transported by truck to the stock yard (≈2000 m2) designated by KOA Remaining soil will be leveled at height of 0.5m from existing ground level ACSC Soil stock area b De-watering excavation: Because of construction in dry season, the dewatering work is not critical However a standby pump will be prepared 11.2 Lean concrete • • • Step 1: Trimming the soil: This work is carried out by digging by hand to form an even and firm base at the right bottom levels of foundation Step 2: Using the rammer and plate compactor to compact the soil to get the level K >= 0.95 Step 3: Using steel box 40x80 (mm) to manufacture the form work for foundation lean concrete layer The dimensions of lean concrete will be 100mm wider on each side to facilitate the installation of formwork later SC-MS- Sub-building 1/Underground Water Tanks, Page 14 CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation • 11.3 Step 4: Casting lean concrete grade B10, stone 1x2 with ready-mixed concrete from the concrete truck via the chute Finishing the concrete surface using straight bar and level machine Formwork of bottom slab • • • • • • Step 1: Setting out the gridline and perimeter of foundation on the surface of lean concrete using theodolite machine Step 2: Install the pre-fabricated formwork at the locations and dimensions, which are marked before Step 3: Fix the bottom of formwork with steel box, nails Step 4: Adjust the formwork to be plumb and straight with steel propping and adjusting jack Step 5: Fix the corners of formwork with nails and secure the formwork with adjusting jack against the stake on ground Step 6: Fill any gap of formwork with lean concrete with mortar ELEVATION OF WASTE WATER TANK SC-MS- Sub-building 1/Underground Water Tanks, Page 15 CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation LAYOUT OF FONDATION FORMWORK 11.4 Steel work of bottom slab • • • • • • Step 1: Cleaning rebar surface Step 2: Fabricate the steel rebar by cutting, bending in compliance with approved shop drawings Tagging the steel rebar Step 3: Transport the fabricated steel rebar to site Step 4: Marking the positions of rebars on lean concrete surface and place the rebars in sequence bottom first and then top Position for lap and lap length as direction Step 5: Tie the steel rebar strongly with wire in correct positions and distance For water bar, we also carry out same way Step 6: Insert spacer under and outside of steel cage to form the concrete cover Spacers will be pre-made with fine aggregate concrete, grade B20 They are shaped by casting in PVC mould D42- D49 (mm) Their heights are depended on the thickness of concrete cover determined in Technical Specification for each kind of structures The concrete proportion is proposed for one mix as below: Cement SC-MS- Sub-building 1/Underground Water Tanks, : 50 kg Page 16 CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation Sand : 49 liter Fine stone (dmax=10mm) : 99 liter Water : 22.8 liter 11.5 Concrete work of bottom slab • • • • • • Step 1: Delivered ready-mixed concrete will be checked of slump as regulation, slump for foundation should be 8÷10 cm Step 2: Concrete will be poured to formwork with chute or concrete pump, depend on the distance from the concrete truck to the footings Step 3: Casting concrete should be performed outside to inside, around edge, then coming center Using vibrator for compaction of concrete Duration of each vibration is not less than 10 second Step 4: Check the finished top level of concrete surface and remove surplus concrete Step 5: Finishing the concrete surface with troweling Step 6: Curing concrete After 12 hours casting concrete, the surface of RC footing is covered by a hessian Spraying water at least times per day (sunny day) Curing concrete is not less than 05 days CURING CONCRETE FOR BOTTOM SLAB 11.6 Formwork of walls • • • • Step 1: the procedure of installing show in picture below Wall formwork and column formwork will install at the same time Step 2: Install the pre-fabricated formwork at the locations and dimensions, which are marked before Normally, install outside wall first, then install wall rebar completely Finally, install the inside wall formwork Step 3: Fix the bottom of formwork with steel box, nails The formwork of columns and wall will be braced with the tie rods D10 as illustrated Step 4: Adjust the formwork to be plumb and straight with steel propping and adjusting jack SC-MS- Sub-building 1/Underground Water Tanks, Page 17 CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation • • 11.7 Step 5: Fix the corners of formwork with nails and secure the formwork with adjusting jack against the stake on ground Step 6: Fill any gap of formwork with sealant Steel work of walls • • • • • • Step 1: Cleaning rebar surface Step 2: Fabricate the steel rebar by cutting, bending in compliance with approved shop drawings Tagging the steel rebar Step 3: Transport the fabricated steel rebar to site after installing outside formwork completely Step 4: Marking the positions of rebars on lean concrete surface and place the rebars in sequence bottom first and then top Position for lap and lap length as direction Step 5: Tie the steel rebar strongly with wire in correct positions and distance For water bar, we also modify position and then fix into rebar by wire Step 6: Place the spacers on both side of formwork, spacing 1m for vertical and horizontal direction SC-MS- Sub-building 1/Underground Water Tanks, Page 18 CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation 11.8 Concrete work for wall and column • • • • • • • Step 1: Delivered ready-mixed concrete will be checked of slump test Slump of concrete for wall/column should be 12±1 (cm) Step 2: Concrete will be poured to formwork with chute or concrete pump, depend on the distance from the concrete truck to the footings Step 3: Casting concrete should be separated layer by layer, with thickness less than 0.5m Step 3: Using vibrator for compaction of concrete Duration of each vibration is not less than 10 second Step 4: Check top level of wall concrete while casting and remove surplus concrete Step 5: Finishing the concrete surface with troweling Step 6: Curing concrete Spraying water at least times per day (sunny day) Curing concrete is not less than 05 days SC-MS- Sub-building 1/Underground Water Tanks, Page 19 CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation CURING CONCRETE FOR TANK WALL 11.9 Formwork of cover slab • • • • • 11.10 Step 1: Install scaffolding, steel tube Ø49, steel box 40x80mm… as illustrated below Step 2: Install the pre-fabricated formwork at the locations and dimensions, which are marked before Step 3: Re-check level of formwork before casting, each 4m 2/ point Step 4: Modify base/top jacks to get required level before casting Step 5: Fill any gap of formwork with tape Steel work of cover slab • • • Step 1: Cleaning rebar surface, chipping surplus concrete of wall Step 2: Fabricate the steel rebar by cutting, bending in compliance with approved shop drawings Tagging the steel rebar Step 3: Transport the fabricated steel rebar to site after installing formwork completely SC-MS- Sub-building 1/Underground Water Tanks, Page 20 CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation • • • Step 4: Marking the positions of rebars on formwork surface and place the rebars in sequence bottom to top Note lap length and reinforce around opening as spec.drawing Step 5: Tie the steel rebar securely with wire in correct positions and distance Step 6: Insert the spacer on slab formwork, spacing 0.6x0.6 (m) SC-MS- Sub-building 1/Underground Water Tanks, Page 21 CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation 11.11 Concrete work of top slab • • • • • • • Step 1: Prepare concrete slump, concrete grade similar bottom slab Step 2: Concrete will be poured to formwork with chute or concrete pump, depend on the distance from the concrete truck to top slab Step 3: Casting concrete should be performed outside to inside, around edge, then coming center Step 3: Using vibrator for compaction of concrete Duration of each vibration is not less than 10 second Step 4: Check the finished top level of concrete surface and remove surplus concrete Step 5: Finishing the concrete surface with troweling Step 6: Curing concrete After 12 hours casting concrete, the surface of RC slab is covered by a hessian Spraying water at least times per day (sunny day) Curing concrete is not less than 05 days 11.12 Back filling + Marking the height on tank wall The thickness of each layer should not exceed 0.5m/ layer + Backfill the excavation with excavated soil, using excavator, workers and rammer + Spray water before compacting + Compacting the soil using rammer to reach the designed compaction K≥ 0.95 + The testing will be carried out for each 300 m2 of each layer + Repeat the backfill and compaction until reach to the finished level 12 QUALITY CONTROL With regards to the quality control, all works shall be carried out following the established Project Quality Control Plan Method to treat mistake or defect during constructing: - Excavation: + Locate position of project by survey machine + Determine the level of bottom slab by leveling machine SC-MS- Sub-building 1/Underground Water Tanks, Page 22 CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation + Check dimension of pit by tape + Tolerance for border, center line, dimension of pit: ± 50mm - Lean concrete: + Check the surface by survey machine, tolerance ±1cm - Installation of form work + Check by leveling machine, tape: Axis tolerance ±8mm; Tolerance for the whole foundation height ±20mm + Check tightness of formwork by visual + Check rigidity and stability of bracing - Installation of rebar + Checking material: certificate, check dimension by caliper,take the sample for checking physical-mechanical + Check the length, number, position, anchor length, joint by visual and ruler + Thickness of protection: checking by tape + Tolerance for installation: Spacing among main rebars:20mm, Stirrups spacing: 10mm + Tolerance for protection layer: Foundation: 10mm + Tolerance for fabrication: the whole length: 20mm, bending: 20mm + Lap length: Rebar SD390 Ribbed bar: 40d(tensile), 15d(compressive) - Casting concrete + Level tolerance on surface: 20mm + Horizontal tolerance of section:± 8mm Back filling + Inspect each layer after compacting + Testing compaction factor as technical requirements and method of owner - 13 RISK ASSESSMENT See attached Appendix No.4 14 SAFETY PLAN With regard to health and safety control, all the works shall be carried out following KOA Safety regulations Some of safety measures are shown as below: No Description of job Hazards Hazard events Injury or death to workers or operators +Traffic accident during mobilization/dem obilization Excavation works + Accident during excavation and transportation the soil SC-MS- Sub-building 1/Underground Water Tanks, Page 23 Preventive measures + Security standby and control public traffic Mobilization/demobilization should not carry out during heavy traffic jam (morning time/evening time) + Excavator should observe roads speed limits + Follow strictly the method to prevent the landslide Heavy objects must stand by at least 1.5m from the edge of opening excavation Action by Forman / Supervisor / Worker CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation +Apply the barrier, ribbon & signboard to prevent the workers fall down to the pit + Excavator driver must has license, excavator must be verify certificate and good active status + The soil around of foundation can be slide Form and Re-bar Installation and Concreting Works Removal or dismantling forms or any temporary structures Backfilling works Unsanitary Site Condition Machinery & Other Equipment Fall down of concrete equipment accessories worker hit by these falling objects Injury of people/worker Workers struck or hit by falling fill materials or any objects Workers struck or hit by falling fill materials or equipment Injury of people/worker Scattering of dirt/garbage and some chemicals Oil spillage to earth Injury of people/worker Damage to neighborhood inhabitants Damage to neighborhood inhabitants Safety check sheet is attached in Appendix No.5 15 APPENDIX Appendix-1: Working Drawing Appendix-2: Construction Schedule Appendix 3: KOA’ ITP for related works SC-MS- Sub-building 1/Underground Water Tanks, Page 24 + Workers must alert when installation of heavy steel materials and during welding works + Wear protective equipment during installation and concreting works + Provide qualified personels to and supervise the job Provide proper equipment platform and qualified signal man for dump trucks unloading backfill materials + Avoid leaking of chemicals and other solution + Keep the site clean before stop working + To make sure all machinery free of oil leak + Repairing/maintenance of machine and other equipment should be done with proper way to avoid oil spillage to earth/ drain Forman / Supervisor / Worker Forman / Supervisor Forman / Supervisor Forman / Supervisor / Worker Forman / Supervisor / Worker CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation Appendix 4: Formwork calculation Appendix 5: Risk assessment Appendix 5: Safety checksheet END SC-MS- Sub-building 1/Underground Water Tanks, Page 25 [...]... Fix the corners of formwork with nails and secure the formwork with adjusting jack against the stake on ground Step 6: Fill any gap of formwork with lean concrete with mortar ELEVATION OF WASTE WATER TANK SC-MS- Sub-building 1 /Underground Water Tanks, Page 15 CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI 2 Architects & Construction Service Corporation LAYOUT OF FONDATION FORMWORK 11.4 Steel work of bottom slab... thickness of concrete cover determined in Technical Specification for each kind of structures The concrete proportion is proposed for one mix as below: Cement SC-MS- Sub-building 1 /Underground Water Tanks, : 50 kg Page 16 CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI 2 Architects & Construction Service Corporation Sand : 49 liter Fine stone (dmax=10mm) : 99 liter Water : 22.8 liter 11.5 Concrete work of bottom... during constructing: - Excavation: + Locate position of project by survey machine + Determine the level of bottom slab by leveling machine SC-MS- Sub-building 1 /Underground Water Tanks, Page 22 CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI 2 Architects & Construction Service Corporation + Check dimension of pit by tape + Tolerance for border, center line, dimension of pit: ± 50mm - Lean concrete: + Check the surface... from the edge of opening hole It is temporary covered by canvas to prevent the dust and used for back filling process later The volume of soil stocked on construction area (for backfilling) are based on the excavated soil subtract the volume of casting concrete The volume of excavating soil, casting concrete are shown in table below: Excavated Soil volume (m3) No Excavation Waste water tank SC-MS- Sub-building... 1 /Underground Water Tanks, Level -4.35m Page 13 Q’ty 1 Volume 60,41x13,27 Total (m3) 801,64 CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI 2 Architects & Construction Service Corporation The surplus soil will be transported by truck to the stock yard (≈2000 m2) designated by KOA Remaining soil will be leveled at height of 0.5m from existing ground level ACSC Soil stock area b De-watering excavation: Because of. .. to prevent the contact of steel rebar with the ground All steel rebar are stocked in the steel yard with roofing and cover with plastic sheet to protect them with rain water Unloading reinforcement from trailer will be carried out by a suitable crane for lifting up reinforcement bundles Prior to fabrication of reinforcement, samples shall be taken from each batch of each size of each delivery and tested... soil by hand to the design elevation + Compacting the base of foundation and testing, if required SC-MS- Sub-building 1 /Underground Water Tanks, Page 11 CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI 2 Architects & Construction Service Corporation - Installation of form work + Completing lean concrete + Setting out and marking the gridlines and dimensions of footings on lean concrete surface + Pre-fabricate formwork... the bottom of formwork with steel box, nails The formwork of columns and wall will be braced with the tie rods D10 as illustrated Step 4: Adjust the formwork to be plumb and straight with steel propping and adjusting jack SC-MS- Sub-building 1 /Underground Water Tanks, Page 17 CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI 2 Architects & Construction Service Corporation • • 11.7 Step 5: Fix the corners of formwork... level of wall concrete while casting and remove surplus concrete Step 5: Finishing the concrete surface with troweling Step 6: Curing concrete Spraying water at least 2 times per day (sunny day) Curing concrete is not less than 05 days SC-MS- Sub-building 1 /Underground Water Tanks, Page 19 CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI 2 Architects & Construction Service Corporation CURING CONCRETE FOR TANK WALL... formwork surface, if required - Installation of rebar + Shape and dimension of rebar + Machine for fabricate rebar + Obtaining the approved Shop drawings - Casting concrete + Inspecting of rebar and formwork (record, pictures) + Prepare internal road for delivery concrete + Cleaning formwork, lean concrete's surface, pump water out of pit + Check finishing level of concrete + Covered starter rebar by PVC