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Biện pháp thi công cống hộp dự án cao tốc Long Thành Dầu Giây MS for box culvert construction at Long Thanh Dau Giay Express Biện pháp thi công cống hộp dự án cao tốc Long Thành Dầu Giây MS for box culvert construction at Long Thanh Dau Giay Express Biện pháp thi công cống hộp dự án cao tốc Long Thành Dầu Giây MS for box culvert construction at Long Thanh Dau Giay Express Biện pháp thi công cống hộp dự án cao tốc Long Thành Dầu Giây MS for box culvert construction at Long Thanh Dau Giay Express
EMPLOYER : : ENGINEER : CONTRACTOR : Ho Chi Minh City - Long Thanh - Dau Giay Expressway Construction Project Package No.5 REVISION NO.: 0 PAGE: 1 OF 17 DATE: 2011.05.03 Method Statement for Construction of Box Culvert Content 1. General 2 2. Scope of Work 2 3. Reference 2 4. Quantity 3 5. Site Organization Chart 4 6. Equipment and Resources 5 6.1 Equipments 5 6.2 Materials 5 7. Drawings 5 8. Site Facilities 6 9. Work Sequence 6 9.1 Preparation 6 9.2 Setting Out 7 9.3 Box Culverts in Embankment Fill – Soft Foundation 10 9.4 Box Culverts in Embankment Fill – Firm Foundation 10 9.5 Box Culverts in Embankment Cut – Rock Foundation 10 9.6 Box Culverts in Embankment Cut – Soft Foundation 11 9.7 Final Stage 11 10. Quality Control and Quality Assurance 11 11. Risks 12 12. Safety and Environmental Measure 13 General 13 Life Saving Appliances 14 Environmental 14 1. General Method Statement for Construction of Box Culvert EMPLOYER : : ENGINEER : CONTRACTOR : Ho Chi Minh City - Long Thanh - Dau Giay Expressway Construction Project Package No.5 REVISION NO.: 0 PAGE: 2 OF 17 DATE: 2011.05.03 Method Statement for Construction of Box Culvert This method statement provides the details of the materials, the equipment, the procedure and relevant documents related to the construction of Box Culverts and related activities, including the quality control verifications, the measurement verifications, and also the safety precautions to be implemented for this. Scope of this method statement applies to Construction of Box Culverts at the locations shown in the contract drawings. Detailed design will be prepared for each location according to the invert level approved by the Engineer shall be adopted for construction purpose. The working drawing accompanied with the bar schedule, lapping arrangement and will be submitted and approval will be taken prior to commencement of site work. For all temporary diversion during construction, the contractor shall submit a formal application with the traffic diversion scheme to the appropriate local for notice and carried out accompanied with the diversion of road pavement shall be similar to the existing road pavement and throughout the construction period the diverted road shall be maintained without potholes. The placing of precast Box culvert are the option it will be implement at site with Engineer Consent. 2. Scope of Work • Preparation • Setting out • Construction of Bedding Sand and Concrete • Placing of Precast Box Culvert or In Situ casting as per the Dimensions in Drawings. • Finished the work to continuation. 3. Reference Standards The following Standards in their latest edition shall be particularly applied to the works covered by this Method Statement. ♦AASHTO M259 Precast Reinforced Concrete Box Sections for Culverts, Storm Drains, and Sewers ♦ AASHTO T11 Materials Finer than 75-µm (No.200) Sieve in Mineral Aggregates by Washing ♦ AASHTO T27 Sieve Analysis of Fine and Coarse Aggregates ♦ AASHTO T89 Determining the Liquid Limit of Soils ♦ AASHTO T90 Determining the Plastic Limit and Plasticity Index of Soils ♦ ASTM D543 Evaluating the Resistance of Plastics to Chemical Reagents ♦ ASTM D570 Water Absorption of Plastics ♦ ASTM D638 Tensile Properties of Plastics ♦ ASTM D2240 Rubber Property—Durometer Hardness Method Statement for Construction of Box Culvert EMPLOYER : : ENGINEER : CONTRACTOR : Ho Chi Minh City - Long Thanh - Dau Giay Expressway Construction Project Package No.5 REVISION NO.: 0 PAGE: 3 OF 17 DATE: 2011.05.03 Method Statement for Construction of Box Culvert 4. Quantity Estimated quantity ( bidding quantity ) is as follows. But they are only for reference. The design quantity will be made from approved working drawings. The actual construction quantity will be shown on As-built Drawing. No. Station Descripti on Length ( m ) Skew Angle (%) Element s of Pi pe Bedding Foundation No. of El e m en ts Length of ea ch El e m en ts 1 24+340 1.5mx1. 5m 36.37 90 36 1m t=0.1 gravel t=0.3 Conc C20 2 26+420 1.5mx1. 5m 33.36 90 33 1m t=0.1 gravel t=0.3 Conc C20 3 26+820 2x(1.5m x1.5m) 31.34 90 31 1m t=0.1 gravel t=0.3 Conc C20 4 27+330 3x(1.5m x1.5m) 32.35 90 32 1m t=0.1 gravel t=0.3 Conc C20 5 27+842 3x(2.0m x2.0m) 48.21 101 48 1m t=0.1 gravel t=0.3 Conc C20 6 29+820 2x(1.5m x1.5m) 41.44 90 44 1m t=0.1 gravel t=0.3 Conc C20 7 30+120 4x(2.0mx2. 5m) 35.38 90 35 1m t=0.1 gravel t=0.3 Conc C20 Method Statement for Construction of Box Culvert EMPLOYER : : ENGINEER : CONTRACTOR : Ho Chi Minh City - Long Thanh - Dau Giay Expressway Construction Project Package No.5 REVISION NO.: 0 PAGE: 4 OF 17 DATE: 2011.05.03 Method Statement for Construction of Box Culvert 8 31+040 1.5mx1.5m 31.34 90 31 1m t=0.1 gravel t=0.3 Conc C20 9 31+352 1.5mx2.0m 37.4 90 37 1m t=0.1 gravel t=0.3 Conc C20 10 32+980 4x(2.0mx2. 5m) 31.34 90 31 1m t=0.1 gravel t=0.3 Conc C20 11 34+218 1.5mx2.0m 32.31 90 32 1m t=0.1 gravel t=0.3 Conc C20 12 35+070 1.5mx2.0m 32.35 90 32 1m t=0.1 gravel t=0.3 Conc C20 13 36+060 2.0mx2.0m 61.6 130 61 1m t=0.1 gravel t=0.3 Conc C20 14 36+700 1.5mx1.5m 43.46 90 43 1m t=0.1 gravel t=0.3 Conc C20 This shall be carried out in accordance with 07950 in Part 2 section 6 as specified in the Employer’s requirements. 5. Site Organization Chart The site organization chart is shown as below. Method Statement for Construction of Box Culvert Project Director Construction Manager QA/QC Manager / Site Manager Site Engineer Surveyor QC Engineer EMPLOYER : : ENGINEER : CONTRACTOR : Ho Chi Minh City - Long Thanh - Dau Giay Expressway Construction Project Package No.5 REVISION NO.: 0 PAGE: 5 OF 17 DATE: 2011.05.03 Method Statement for Construction of Box Culvert 6. Equipment and Resources 6.1 Equipments No Machine Qty 1 Excavator/or Backhoe 02 2 Mobile Crane (Box Laying) 01 3 Dump Trucks 01 4 Rammer / Plate Compactor 04 5 Water Bowser 01 6 Water Pumps 02 7 Rock Drilling Machine (If trench involves rock excavation){If Required} 01 8 Concrete Vibrators As required 9 Concrete Truck Mixers As required 10 Concrete Pump car As required Note: above stated quantity of equipments could be changed if any required and necessary 6.2 Materials Method Statement for Construction of Box Culvert Sub-contractor Project Manager Site Manager Site Engineer Foremen Operator Worker EMPLOYER : : ENGINEER : CONTRACTOR : Ho Chi Minh City - Long Thanh - Dau Giay Expressway Construction Project Package No.5 REVISION NO.: 0 PAGE: 6 OF 17 DATE: 2011.05.03 Method Statement for Construction of Box Culvert No. Category Quantity 1 R/C s Box Culverts. As required 2 Backfilling Soil Material As required 3 Bedding Sand As required 4 Concrete C-20 for lean Bedding As required 5 Plastic Water Stop As required 6 Mastic Bitumen As required 7 Bituminous sheet As required 8 Cement Mortar C-10 As required 9 Steel Plates(steel shape and Plate) As required Note: Samples of materials shall be submitted separately. 7. Drawings: After obtaining the approval for Construction drawings, base on the contract shall be carry out the scope of work. 8. Site Facilities • Available access roads will be used for the necessary machinery and Equipment to delivering. • Provide access (Service/Temporary roads) as accepted by engineer for public beyond ROW. 9. Work Sequence Flow Chart Method Statement for Construction of Box Culvert Step 1 – Preparation and Setting out Step 2 – Construction of Bedding Step 3 – Placing of Precast Box Culvert or Cast Insitu at Site as per Engineer’s Consent EMPLOYER : : ENGINEER : CONTRACTOR : Ho Chi Minh City - Long Thanh - Dau Giay Expressway Construction Project Package No.5 REVISION NO.: 0 PAGE: 7 OF 17 DATE: 2011.05.03 Method Statement for Construction of Box Culvert 9.1. Preparation The Contractor will maintain an adequate number of trained and experienced supervisors and foremen at the site to supervise and control work. Adequate number of labours will be maintained for all construction activity including skilled masons, skilled carpenters and skilled person to operate the vibrators.' All construction other than concrete will be confirmed to the requirements prescribed in other sections of the specification for the several items of work entering into complete structure. Prior to commencement of the work, the Engineer will be requested to participate for a joint site visit & to confirm the location of the Drainage Box Culverts as given on the drawing (Plan & Profile). Where possible the Engineer will confirm the foundation applicable at each particular location as specified in drawings. The length/ width/section type of the Box Culverts will be requested in embankment filling or cutting for purpose of Box Culverts constructions. The preparation of construction drawings will then proceed in consideration of the ground conditions and above data to ensure that the steps of the procedure are fully complied with during the activities as per section 7950 clause 3.1 of technical specification such as setting out, excavation, embankment filling, formwork, reinforcement, concreting, backfilling and other activities etc. certain inspections and verifications will be carried out as outlined in the attached Inspection & Test Plan Measurements relative to construction Drainage Box Culverts will be taken off from the approved drawings. Variations if will be recorded during the course of the works, the relevant drawings will be revised accordingly and obtain approval from the Engineer. 9.2. Setting out • Setting out will be carried out with the help of the survey data provided in the drawings. • If required, the existing stream flow will be diverted so that the new construction works will not be affected by the water flow • Survey Records for joint measurements all Excavation works • Survey Records for joint measurements all filling works Method Statement for Construction of Box Culvert Step 4 – Backfilling EMPLOYER : : ENGINEER : CONTRACTOR : Ho Chi Minh City - Long Thanh - Dau Giay Expressway Construction Project Package No.5 REVISION NO.: 0 PAGE: 8 OF 17 DATE: 2011.05.03 Method Statement for Construction of Box Culvert • Site measurements for pipe length • Tolerances Horizontal and Vertical Control. Staking Phase Horizontal Vertical Control points ± 5 mm ± 3 mm Centerline points (a) – (PoC), (PoT) ,(PoT) and (PoC ) including references thereto ± 5 mm ± 3 mm Other center line points ± 10 mm ± 10 mm Cross-Section points, slope stakes, and slope stake reference (b) ± 20 mm ± 10 mm Culverts, ditches, and minor drainage structures ± 10 mm ± 10 mm Retaining walls ± 10 mm ± 10 mm Railroad crossing structures ± 3 mm ± 3 mm Bridge Substructure ± 5 mm ± 5 mm Bridge Superstructures ± 3 mm ± 3 mm Clearing and grubbing limits ± 200 mm Roadway subgrade finish stakes ± 10 mm ± 10 mm Roadway finish grade stakes ± 3 mm ± 3 mm Note : (a): Center line points are point of curve ( PoC), point of Tangent (PoT) and point on curve ( PoC) (b): Take the cross sections normal to centerline within ± 1 degree (0.02 rad) • Acceptance Criteria The finished dimensions of box culverts shall be as follows; Dimension Tolerances Box Culvert Wing wall Apron Approach Slab Center Position ±5 mm Top Level ±5 mm Method Statement for Construction of Box Culvert EMPLOYER : : ENGINEER : CONTRACTOR : Ho Chi Minh City - Long Thanh - Dau Giay Expressway Construction Project Package No.5 REVISION NO.: 0 PAGE: 9 OF 17 DATE: 2011.05.03 Method Statement for Construction of Box Culvert Invert Level ±5 mm Dimension Inner & Outer 10 to +20 mm* Verticality 1 in 300 Top Grade Irregularities ±2.5 mm • Construction of Box Culvert. Bedding • Sand bedding shall be arrange the detail given in drawings as 100 mm thick, Material as specified in 2.2 of Section 07950 .Sand PI ,LL and Gradation as specified. • Lean Concrete Bedding • C-20 lean concrete bedding as specified in drawings and Concrete as per section 07100 in technical specification. • Cut off Plates (water Stop) • As per drawings and specified in 2.2.2 in technical specification. Method Statement for Construction of Box Culvert EMPLOYER : : ENGINEER : CONTRACTOR : Ho Chi Minh City - Long Thanh - Dau Giay Expressway Construction Project Package No.5 REVISION NO.: 0 PAGE: 10 OF 17 DATE: 2011.05.03 Method Statement for Construction of Box Culvert (A) Installation of Box Culvert Contractor used the pre cast box culvert from approved sources and place by segments (pre cast boxes) as specified in drawing as consent given by the Engineer. It will be place in the required ground stipulated after the given below treatment for foundation. Used Mobile crains for this matter and will evaluate the relevant dimension and detail for measurements. (B) Cast in Place of Box Culvert Formwork, false work and Centering Formwork will be included temporary and permanent moulds for forming concrete and tight and rigid enough to maintain the concrete in position during placing, compaction, setting and hardening. The design calculation with typical sketches showing the thickness of molding plates, details and intervals of struts and side supports shall be submitted for verifications. Engineer's approval will be taken before placing concrete for all formwork, false work and centering. For detailed information regarding inspection requirement of formwork, all the approval of the material quality shall be obtained from the Engineer reasonably before commencement of work. Reinforcement All reinforcement will be placed, supported and secured in accordance with the requirement of section 07500 reinforcement and approval from the Engineer will be taken before beginning of concrete operation. An experienced steel fixer will be present while all concrete is placed to ensure that no reinforcement becomes displaced. Before placing the bars shall be cleaned with wire brushes to remove rust. Placing Concrete All concrete will be placed within the times specified. (Concrete Structures) in such a manner as to avoid segregation and the displacement of reinforcement bars. Ready mixed concrete and concrete truck mixer will be used ' Chute /skip bucket 1 , Concrete pump car will be used when concrete to be placed with vertical distance of more .Concrete will be thoroughly compacted by concrete vibrator during the operation of placing. Adequate working condition concrete vibrators will be available prior to the concrete pour with one or two reserve vibrators. Before initiate placing concrete PVC ducts will be placed for lighting and other services as stated in drawings. Method Statement for Construction of Box Culvert [...]... the Site Office ♦ 11 Risks • Human damages when Pre-cast Box Culvert laying: Solution: Method Statement for Construction of Box Culvert EMPLOYER : : ENGINEER : CONTRACTOR: Ho Chi Minh City - Long Thanh - Dau Giay Expressway Construction Project Package No.5 Method Statement for Construction of Box Culvert Allocate Provide safety equipment skill REVISION NO.: 0 PAGE: 14 OF 17 DATE: 2 011 .05.03 people •... Statement for Construction of Box Culvert Ho Chi Minh City - Long Thanh - Dau Giay Expressway Construction Project Package No.5 EMPLOYER : : ENGINEER : Method Statement for Construction of Box Culvert CONTRACTOR: REVISION NO.: 0 PAGE: 13 OF 17 DATE: 2 011 .05.03 An inspection sheet will be forwarded to the Engineer to receive the Engineer's certification for completion of backfilling and compaction for. .. Expressway Construction Project Package No.5 Method Statement for Construction of Box Culvert REVISION NO.: 0 PAGE: 12 OF 17 DATE: 2 011 .05.03 9.5 Box Culverts in Embankment Cut - Rock Foundation Excavate the trench by blasting in accordance with the blasting pattern approved by the Engineer This additional excavation will be backfilled with approval material Rock excavation will be performed as mentioned... Giay Expressway Construction Project Package No.5 Method Statement for Construction of Box Culvert REVISION NO.: 0 PAGE: 17 OF 17 DATE: 2 011 .05.03 immediately returned to agricultural use If any other problems occurred in the site, applicable counter measures or prevention action shall be considered immediately and executed as soon as possible Method Statement for Construction of Box Culvert ... throughout the Box culvert Construction operations shall comply with general safety standards to be adopted at a construction site Safety arrangement according to the project safety plans Risk assessment will be enclosed this method statement Life-Saving Appliances Method Statement for Construction of Box Culvert EMPLOYER : : ENGINEER : Ho Chi Minh City - Long Thanh - Dau Giay Expressway Construction. .. Package No.5 Method Statement for Construction of Box Culvert CONTRACTOR: REVISION NO.: 0 PAGE: 16 OF 17 DATE: 2 011 .05.03 The Pumyang and Sungjee shall provide and maintain on the Site sufficient, proper and efficient life-saving appliances to the approval of the Engineer The appliances must be conspicuous and available for use at all times Environmental During the process of construction, installation,... Before starting the works, operators and labors should memorize the method, contents, scope of work • The team will be mixed experts and with beginners Method Statement for Construction of Box Culvert EMPLOYER : : ENGINEER : CONTRACTOR: Ho Chi Minh City - Long Thanh - Dau Giay Expressway Construction Project Package No.5 Method Statement for Construction of Box Culvert REVISION NO.: 0 PAGE: 15 OF 17 ... mentioned in the Method Statement for Earthwork and the Construction Procedure for Rock Blasting works Dimension of the trench varies in accordance with the drawings Then the procedure mentioned above will be adopted to perform the task as Method 1 and Method 2 9.6 Box Culverts in Embankment Cut - Soft Foundation If the ground material observes soft, spongy or unstable, seek for Engineers approval to remove... each Drainage Box Culverts in prior to commence the adjacent Embankment filling 10 .Quality Control and Quality Assurance Material Materials shall be submitted for Engineer’s approval prior to delivery onsite ( sample, supplier, material sources…etc ) The major materials used for the construction of Box culverts include, but are not limited to the following ♦ ♦ ♦ ♦ ♦ ♦ Reinforced Concrete box (Pre-Cast)... the Method Statement for Earth Work Compaction testing will be done as specified in the technical specifications An inspection sheet will be forwarded to the Engineer to receive the engineer's certification for completion of the work instructed by the Engineer Then the procedure mentioned above will be adopted to perform the task as Method 1 and Method 2 9.4 Box Culverts in Embankment cut - Firm Foundation . Foundation 10 9.6 Box Culverts in Embankment Cut – Soft Foundation 11 9.7 Final Stage 11 10 . Quality Control and Quality Assurance 11 11 . Risks 12 12 . Safety and Environmental Measure 13 General 13 Life. 2 011 .05.03 Method Statement for Construction of Box Culvert 8 31+ 040 1. 5mx1.5m 31. 34 90 31 1m t=0 .1 gravel t=0.3 Conc C20 9 31+ 352 1. 5mx2.0m 37.4 90 37 1m t=0 .1 gravel t=0.3 Conc C20 10 . 32+980 4x(2.0mx2. 5m) 31. 34 90 31 1m t=0 .1 gravel t=0.3 Conc C20 11 34+ 218 1. 5mx2.0m 32. 31 90 32 1m t=0 .1 gravel t=0.3 Conc C20 12 35+070 1. 5mx2.0m 32.35 90 32 1m t=0 .1 gravel t=0.3 Conc C20 13 36+060