Method Statement of RC columns

CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation METHOD STATEMENT SMC Manufacturing (Viet nam) Factory-phase Project RC COLUMNS Ref No: SMC-ACS-MS-00-CCW-002 Rev 00 ACSC- CONG TY CO PHAN XAY LAP THUONG MAI SMC-Factory No.1/MS-RC Columns Page CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation Revision History Revision 00 Date of issue 17/8/2015 Purpose of issue (approved/ revision) For Review Submitted by ACSC Name Prepared by Lương Văn Lượng Reviewed by Phạm Vũ Nam Approved by Nguyễn Văn 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 Reviewed by Approved by Approved by Client Name Prepared by Reviewed by SMC-Factory No.1/MS-RC Columns Position Page Date Signature CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation Contents SMC-Factory No.1/MS-RC Columns Page CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation INTRODUCTION 1.1 GENERAL This method statement describes the methodology for Reinforced Concrete column construction Work will be executed in accordance with Technical Specification includes steel works, formworks and casting concrete The construction of column will be start from stump columns or ground beams (with Ground Floor Columns) and from 1st floor to the roof Column construction will resume at least one day after casting of concrete of floor slab 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.1 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) BUILDING DESCRIPTION: Location: SMC-Factory No.1/MS-RC Columns Page CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation Factory No.1 are located at the corner of Road No.D5 &N2-5 in Long Duc Industrial park as below Factory No Description: - Building purpose : Factory Foundation : Spun piles (D300, 350, 400 mm) Structure :RC structures + steel rafter; Slab on grade Dimensions: o Factory  140m long (14x10m); 60 (4x15m) - 69m wide  Ground Floor (FL 0.00m); 1st Floor (FL +7.25m)  Height : 11.40m o Utilities area: x (120m long, 4.5m wide) SMC-Factory No.1/MS-RC Columns Page CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation GROUND FLOOR PLAN - Floor load: o Factory Ground Floor o WC Ground Floor o Stair case o Storage/Utilities - Slab thickness: o Factory Ground floor slab : 300 mm thk o Storage/Utilities Ground Floor slab : 150 mm thk o 1st Floor slab : 140 mm thk - Area: o o : 40 KN/m2 : KN/m2 : KN/m2 : 10 KN/m2 Ground floor + Factory area + Storage/Utilities area 1st Floor SMC-Factory No.1/MS-RC Columns : 9561 m2 : 8400 m2 : 1161 m2 : 9561 m2 Page CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation GUTTER CORRIDOR ZINC ROOF SHEET DOWN SPOUT C OR R ID O R ZIN C R OO F SH EET T R.BEAM GFL+13.650 / 20 T O.BEAM GFL+11.900 750 1/ 20 CANOPY; STEEL BEAM F AC TO R Y -02 1FL GFL+7.250 3650 C ON N E C T ION C OR R ID OR 650 STEEL KICKER GFL GFL±0 800 4800 250 500 1600 LOADING BAY GUARD POST ( 100?, H=1500) 500 5000 5000 5000 0000 SMC-Factory No.1/MS-RC Columns Page 5000 500 2000 CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation TYPICAL CROSS SECTION SMC-Factory No.1/MS-RC Columns Page CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation ORGANIZATION CHART 3.1 Organization Chart Project Manager NGUYỄN VĂN TRUNG (MP: 090 330 7742) nguyenvantrung@acsc.com.vn Site Manager PHẠM VŨ NAM (MP: 093 767 6736) phamvunam@acsc.com.vn Deputy Site Manager Deputy Site Manager NGUYỄN HOÀNG TRINH (MP:090 291 1235) LƯƠNG VĂN LƯỢNG (MP: 093 734 3055) nghoangtrinh@acsc.com.vn luonglv@acsc.com.vn Site Engineers QA&QC Nguyễn Minh Tuấn (MP: 098 314 5069) Trần Văn Nghiệp (MP: 090 935 6020) tranvannghiep@acsc.com.vn Trần An Toàn (MP: 090 803 3934) Võ Công Hiếu (MP:01676211311) QS Lê Trọng Thức (MP:098 967 4457) Procurement& logistics Thái Doãn Long (MP:097 799 7711) thaidoanlong@acsc.com.vn Shop Drawings Hoàng Văn Hải (MP:908 818 1059) Safety Supervisors Nguyễn Anh Đức (MP:0986 274 758) Phạm Văn Mạnh (MP:097 235 2459) Đỗ Vũ Quyền Anh (MP:090 853 1908) Construction teams SMC-Factory No.1/MS-RC Columns Page CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation 3.2 Assignment Position Site Engineer QA&QC Engineer Safety Supervision Factory No.1 TRẦN AN TOÀN NGUYỄN MINH TUẤN LƯƠNG VĂN LƯỢNG PHẠM VĂN MẠNH Factory No.9 VÕ CÔNG HIẾU TRƯƠNG THANH VIỆT TRẦN VĂN NGHIỆP NGUYỄN VĂN TRIỂU SCHEDULE Construction Schedule of Columns is attached in Appendix-2 SPECIFIC STANDARD Reinforced Concrete Columns shall be carried out in accordance with the requirements of: - - SMC MANUFACTURING (VIET NAM) FACTORY-PHASE PROJECT Specification for Column works Current Vietnamese Construction Standards + 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) + TCVN 4453 – 1995 Vietnamese standard 4453-1995 (Concrete structures- codes for construction, check and acceptance) + TCXDVN 371 - 2006 Vietnamese standard 371-2006 (Acceptance of constructional quality of building works) Related Materials approved by KAJIMA & Owner SMC-Factory No.1/MS-RC Columns Page 10 CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation - On 1st floor, there are 92 RC columns with section vary from 30x30 (cm) to 50x50 (cm) Their heights vary from 3.99 to 5.81 m (from st floor GFL+7.250 to the bottom of rafter) Hereafter is the list of columns from 1st floor to the roof: SMC-Factory No.1/MS-RC Columns No Column CA1 CA2 CA3 CA4 CA5 CA6 CA7 Dimension (mm) 300x300 500x500 500x500 500x500 500x500 500x500 500x500 Grand Total Page 12 Total 13 26 33 10 92 CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation FLOW CHART AND DIRECTION OF WORK The work sequence of construction the RC Columns is shown at the following flow chart Preparation concrete surface and starter bars Installation scaffolding & platform Rebar fabrication Installation steel rebar Formwork fabrication Installation of form work Casting concrete Install anchor bolts For columns from 1FL to the roof only Final casting concrete Removing formwork Curing concrete SMC-Factory No.1/MS-RC Columns Page 13 CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation PREPARATION WORKS - - Scaffolding preparation: + Scaffolding will be installed aside the column and be propped/braced securely + Install platform and handrail on each story of scaffolding + Provide the ladder on scaffolding from the ground to the working level Surface preparation + Chip out and remove all debris, loose material on top surface of stump columns/ground beams + Cleaning the surface on the top of stump columns/ground beams with water + Cleaning any laitance, dirt, dust on the starter bars - Pre-fabricate formwork + Plywood are cut in compliance with design width + The reinforced steel boxes 4x8 (cm) are fixing to plywood to result the formwork panels + The formwork panels will be transported to site near the construction area + To ensure the fair-face formwork, the plywood will be used with maximum cycles - Pre-Fabricate Steel rebar + Obtain approved shop drawings and Bar Bending Schedule + Manufacturing steel rebar + Casting concrete block for spacer + Deliver steel rebar to site and stock near construction area - Concrete work + Cover starter rebar by PVC sheet before casting + Prepare bucket or chute for casting from top to bottom + Order the concrete SMC-Factory No.1/MS-RC Columns Page 14 CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation CONSTRUCTION METHOD 9.1 Preparation: - - - Concrete surface preparation and column starter bars shall be done first before proceed to the reinforcing bar installation With Ground floor, the concrete surface are on top of Ground beams or stump columns With 1st Floor, the concrete surfaces are on concrete slab All laitance and loose material at column location at the top of concrete shall be removed; this will be served as construction joint between concrete slab and RC column Dust and loose material will be cleaned by means of air compressor or water Make sure that starter bars for column are free from concrete laitance before start the installation of reinforcing bars The gridlines and column perimeters will be marked directly on finished concrete surface to locate and shape the columns Before any use, all the plywood surface will be applied the release agent 9.2 Installation of working platform - Scaffolding shall be installed at every column location, this will serve as casting concrete platform SAFETY BODY HANESS STEEL HANDRAIL STEEL PLATFORM SCAFOLDING FOR WORKER STEEL LADDER STEEL SUPPORT TRANSOM SCA FOL DIN G INST ALL FRO M GRO UND FLO @50 @50 @50 @50 OUTSIDE SUPPORT STEEL PROP D49 INSIDE ANCHOR STEEL REBAR (SET UP BEFORE CASTING SLAB) SMC-Factory No.1/MS-RC Columns Page 15 CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation 9.3 Installation of steel bars - - Fabrication and Installation of rebars shall be done according to the approved working drawings and project specification, conforming to the specified splicing length, splicing location and standard concrete covering Starter reinforcing bar of column will be checked based on the survey layout, plumbness of this starter bars shall be check prior to the overlapping of the next main bar TYPICAL PLAN SMC-Factory No.1/MS-RC Columns Page 16 40D 20D 40D 200 ±0.000 Staggered splicing MAIN COLUMN START REBARS Staggered splicing CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation GROUND BEAM B1 B1 B - Start lapping of column main bars by tie wires to the embedded starter bars on slab following required lapping length and approved staggered splicing location After completely installed the column main bars, stirrups spacing shall be marked on the column main bars prior to the stirrups installation Then tie bars will also be provided based on the design spacing PLAN SMC-Factory No.1/MS-RC Columns Page 17 CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation - Concrete blocks will be used as spacer for side in order to keep the appropriate concrete covering 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 Sand Fine stone (dmax=10mm) Water - : 50 kg : 49 liter : 99 liter : 22.8 liter In some cases where the column size is design to be reduced in upper floor level the rebars will be slightly bended and some rebars need to embed considering the embedment requirement Basically, design of rebars for column reduce in the upper floor level, therefore some rebars also need to cut at designated level Please refer to the figure below for sample case of Reinforced Concrete column design 9.4 Formwork installation: - - In general, the maximum height of column is on Ground floor heights from 6.15m to 6.45m Reinforcing bar inspection shall be carried out first prior to close column formworks Using pre-fabricated formwork panels which have the width varies from 300mm to 500 mm Design sizes of columns will be met by combining different width of panels These panels will be assembled with tie rod on sides and steel bracing boxes on two other sides Basically this supports will be applied to bear the lateral concrete pressure The distance of tie rod and steel bracing boxes is determined via calculation in the Appendix No.3 The distance of tie rods will vary depend on the height of casting concrete From the bottom to the height 1,5m (from the ground), the distance of tie rods is 250mm From the height of 1.5m to 3.0m, this distance is 0.4m From the height of 3.0m to the top, this distance is 0.5m SMC-Factory No.1/MS-RC Columns Page 18 CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation - At the corners of columns formwork, the triangular wood strips will be nailed into the plywood to form the chamfers 15x15 (mm) of columns SMC-Factory No.1/MS-RC Columns Page 19 CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation - - Using steel pipes supports to horizontally and vertically straighten the formwork panels will be provided, this will be installed up to top of formwork The bottom of steel props will be fixed and supported by timber blocks, which are fixed on the ground with stake or on the finished RC slab with nails See figure as typical formwork elements below At the height above 3.0m, the cable D10mm and turnbuckle will be used to fix and adjust the plumpness of formwork system Apply the sealant or similar material around the bottom of formwork to prevent the leakage COLUMN START REBAR SAFETY BODY HANESS STEEL HANDRAIL STEEL PLATFORM SCAFOLDING FOR WORKER VERTICAL SUPPORT BAR STEEL BOX 50X50X2 SUPPORT STEEL PROP D49 STEEL LADDER @5 00 @5 00 @5 00 @5 00 @5 00 OPENING HOLD SIZE: 150X300 CABLE D10 SCAFOLDING FOR WORKER TURN BUCKLE FIXED STAKE STUMP COLUMN & FOUNDATION FIXED STAKE CONSTRUCTION METHOD FOR COLUMN - Using theodolite and plumb bob, the shape and alignment of formworks will be checked Column formwork panels will be propped and adjusted with steel propping combining with cable and turnbuckle 9.5 Concrete work - Concrete will be transported from batching plant to site by mixer truck, the slump of concrete must be within 12 ± 2.0 (cm) Ready mixed concrete from mixer truck will be then discharge to concrete pump which is set-up near the construction area how its boom can reach to the casting columns Concrete will be poured through the hose system moving at every column location In case the pump hose is not long enough, a canvas hose will be connected to extend the hose At each cast, SMC-Factory No.1/MS-RC Columns Page 20 CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation - - 9.6 the pump hose will be placed inside column formwork and moved up to ensure the drop height from bottom of hose to concrete surface smaller than 50 cm Concrete will be cast layer by layer with the thickness not greater than 50cm then be vibrated with concrete vibrator inside Using the poking vibrator with the rod at least 8m long to ensure the poking reach to the bottom of columns (first cast) At each 3.0m high of column concrete, the casting will be paused at least 30 minutes before resume to allow concrete consolidation, consequently there will be casts of each columns 6m high The time for each cast 3.0m is approximately 30 minutes Total the time to complete each column is about 30 + 30 + 30 = 90 minutes Columns finish level of concrete at desired levels With the columns of Ground floor, the concrete of columns will be finished at the bottom levels of slab beams With the columns of st floor, the casting concrete will be temporarily stopped at the bottom of anchor bolts of rafter After the anchor bolts are set, the remaining concrete will be cast to the design levels (bottom of rafter) The additional stage will facilitate the casting and vibration of concrete without the obstruction of anchor bolts and their template Curing: - - The formwork of columns will be removed after 24hrs The concrete will be cured with Antisol E- a curing agent produced by SIKA with density 46m2/liter (See Appendix 7) An alternative is using canvas fabric to wrap the columns and water twice every day The curing will long at least days SMC-Factory No.1/MS-RC Columns Page 21 CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation 10 TOOL & EQUIPMENT The equipment to be used for the construction of Columns is listed below Unit Q’t y set 80 For platform Concrete pump ea Pumping concrete Steel prop set 240 Support formwork Item Scaffolding Description 1.7m high Remarks Cable & turnbuckle D10mm set 160 Adjust formwork Concrete Vibrator Gasoline Nos Vibrate concrete Hammer machine Nos For roughening concrete surface Portable steel cutter Nos For cutting steel bar Straightening machine Nos Use for reinforcing steel work Diameter 10mm : SD390, B15-B35 c/ Form work: - Plywood, 18mm thk reinforced with steel boxes 40 x 80 x 2.0 (mm) Wooden strip to form chamfer 15x15 (mm) d/ Curing agent: - SIKA Antisol-S 12 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 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 13 QUALITY CONTROL With regards to the quality control, all works shall be carried out following the established Project Quality Control Plan SMC-Factory No.1/MS-RC Columns Page 23 CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation Installation of form work + Check by leveling machine, tape + 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 + Lap length: Rebar SD390 Ribbed bar: 40d (tensile), 15d (compressive) The tolerance of works related to columns will comply with KOA ITP shown in Appendix SMC-Factory No.1/MS-RC Columns Page 24 CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation 14 RISK ASSESSMENT See attached Appendix No.5 15 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 Working at height Hazards +Falling accident during installation rebar, formwork + Accident during casting concrete +Falling object from the height Hazard events Injury or death to workers or operators Form and Re-bar Installation and Concreting Works Injury of people/worker High scaffolding Fall down of concrete equipment accessories worker hit by these falling objects + Scaffolding collapse Removal or dismantling forms or any temporary structures Unsanitary Site Condition Workers struck or hit by falling fill materials or any objects Scattering of dirt/garbage and some chemicals Injury of people/worker Injury of people/worker Damage to neighborhood inhabitants Preventive measures + Install scaffolding to provide sufficient working area on platform + Install the ladder for escalation + Install handrail around platform + Install warning tape, barrier to stop person enter the working area + Workers must alert when installation of heavy steel materials + Wear protective equipment during + Installation and concreting works + Scaffolding must be installed on firm and secure base + Using base jack to adjust the level of scaffolding base + Using steel prop to support the scaffolding + Bracing the single scaffolding together + Provide qualified personnel to and supervise the job Action by Forman / Supervisor / Worker + Avoid leaking of chemicals and other solution Forman / Supervisor / Worker Forman / Supervisor / Worker Forman / Supervisor / Worker Forman / Supervisor + Keep the site clean before stop working Machinery & Other Equipment Oil spillage to earth SMC-Factory No.1/MS-RC Columns Damage to neighborhood inhabitants Page 25 + 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 CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI Architects & Construction Service Corporation Safety check sheet is attached in Appendix No.6 16 APPENDIX Appendix-1: Working Drawing Appendix-2: Construction Schedule Appendix 3: Calculation of Formwork Appendix 4: KOA’ ITP for related works Appendix 5: Risk assessment Appendix 6: Safety check sheet Appendix 7: Catalog of SIKA Antosol-S Appendix 8: Catalog of TEKCOM Plywood product END SMC-Factory No.1/MS-RC Columns Page 26 [...]... consequently there will be 2 casts of each columns 6m high The time for each cast 3.0m is approximately 30 minutes Total the time to complete each column is about 30 + 30 + 30 = 90 minutes Columns finish level of concrete at desired levels With the columns of Ground floor, the concrete of columns will be finished at the bottom levels of slab beams With the columns of 1 st floor, the casting concrete... the bottom of rafter) Hereafter is the list of columns from 1st floor to the roof: SMC-Factory No.1/MS -RC Columns No Column 1 2 3 4 5 6 7 CA1 CA2 CA3 CA4 CA5 CA6 CA7 Dimension (mm) 300x300 500x500 500x500 500x500 500x500 500x500 500x500 Grand Total Page 12 Total 13 26 0 33 10 6 4 92 CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI 2 Architects & Construction Service Corporation 7 FLOW CHART AND DIRECTION OF WORK The... sequence of construction the RC Columns is shown at the following flow chart Preparation concrete surface and starter bars Installation scaffolding & platform Rebar fabrication Installation steel rebar Formwork fabrication Installation of form work Casting concrete Install anchor bolts For columns from 1FL to the roof only Final casting concrete Removing formwork Curing concrete SMC-Factory No.1/MS -RC Columns. .. distance of tie rod and steel bracing boxes is determined via calculation in the Appendix No.3 The distance of tie rods will vary depend on the height of casting concrete From the bottom to the height 1,5m (from the ground), the distance of tie rods is 250mm From the height of 1.5m to 3.0m, this distance is 0.4m From the height of 3.0m to the top, this distance is 0.5m SMC-Factory No.1/MS -RC Columns. .. SMC-Factory No.1/MS -RC Columns Page 18 CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI 2 Architects & Construction Service Corporation - At the corners of columns formwork, the triangular wood strips will be nailed into the plywood to form the chamfers 15x15 (mm) of columns SMC-Factory No.1/MS -RC Columns Page 19 CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI 2 Architects & Construction Service Corporation - - Using steel pipes supports...CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI 2 Architects & Construction Service Corporation 6 SCOPE OF WORKS: - On Ground Floor, there are total 123 columns with section vary from 30x30 (cm) to 50x50 (cm) Their heights vary from 6.15m to 6.45m high (from top of ground beams/stump columns to the bottom of 1st floor beams GFL+ 6.15) Hereafter is the list of columns from ground floor to 1st floor: No 1... 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 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... SMC-Factory No.1/MS -RC Columns Page 15 CÔNG TY CỔ PHẦN XÂY LẮP THƯƠNG MẠI 2 Architects & Construction Service Corporation 9.3 Installation of steel bars - - Fabrication and Installation of rebars shall be done according to the approved working drawings and project specification, conforming to the specified splicing length, splicing location and standard concrete covering Starter reinforcing bar of column will... case of Reinforced Concrete column design 9.4 Formwork installation: - - In general, the maximum height of column is on Ground floor heights from 6.15m to 6.45m Reinforcing bar inspection shall be carried out first prior to close column formworks Using pre-fabricated formwork panels which have the width varies from 300mm to 500 mm Design sizes of columns will be met by combining different width of panels... casting concrete will be temporarily stopped at the bottom of anchor bolts of rafter After the anchor bolts are set, the remaining concrete will be cast to the design levels (bottom of rafter) The additional stage will facilitate the casting and vibration of concrete without the obstruction of anchor bolts and their template Curing: - - The formwork of columns will be removed after 24hrs The concrete will