Report of method statement mong duong project

CONTENT CHAPTER TEMPORARY WORK & PREPARATION 1.1 GENERAL 1.2 SITE INSPECTION, ATTACHING BATTER BOARDS, SCAFFOLDING 1.3 TEMPORARY ACCESS ROAD 1.4 MATERIAL STORAGE YARDS, CONSTRUCTION SHEDS AND OTHER TEMPORARY WORKS 1.5 REMOVAL OF TEMPORARY UNITS AND OTHERS CHAPTER EARTH WORK 2.1 GENERAL REQUIREMENT 2.2 EARTH WORK SUPPORT 2.3 METHOD OF EXECUTION CHAPTER REINFORCEMENT WORKS 12 3.1 MATERIALS 12 3.2 PROCESSING AND ASSEMBLY 12 3.3 ARRANGEMENT OF BARS 13 3.4 HOLES IN BEAMS AND OTHER CASE 13 CHAPTER FORMWORKS 15 4.1 MATERIALS AND CONSTRUCTION 15 4.2 ASSEMBLY 16 4.3 FORMWORK INSTALLATION 17 4.4 FORMWORK REMOVAL 17 4.5 HEAD TREATMENT FOR FORM TIGHTENING PARTS 18 CHAPTER CONCRETE WORK 19 5.1 GENERAL 19 5.2 CONCRETE CASTING PLAN 19 5.3 MATERIALS FOR NORMAL WEIGHT CONCRETE 20 5.4 MIX PROPORTION OF ORDINARY CONCRETE 20 5.5 PRODUCTION, TRANSPORT AND PLACEMENT OF CONCRETE 21 5.6 TESTING 24 5.7 TROWEL FINISH FOR FLOOR CONCRETE 25 CHAPTER ERECTING COMPONENTS 27 6.1 GENERAL CHARACTERISTIC OF EXECUTIAT THE SITE 27 6.2 EXECUTED ORGANIZATION 28 6.3 ORGANIZING AND WORKING METHOD 29 6.4 ERECTING METHOD 31 6.5 GENERAL REGULATION 37 CHAPTER STRUCTURAL STEEL WORK 38 7.1 GENERAL 38 7.2 MATERIALS REQUIREMENTS 38 7.3 GENERAL SHOP DRAWINGS 39 7.4 ANCHOR BOLT SETTING 43 7.5 WELDED JOINTS 45 7.6 PAINTING 50 7.7 OTHER NOTICES ON FABRICATING STEEL STRUCTURES 50 CHAPTER FINISHING WORKS 52 8.1 WATERPROOFING 52 8.2 BRICK WORK 53 8.3 DOOR FRAMES INSTALLATION 53 8.4 PLASTER WORK 55 8.5 TILE WORK 57 8.6 PAINTING WORKS 61 8.7 CEILING WORK 62 8.8 METAL WORK 63 CHAPTER INTERNAL ROAD 65 9.1 ROADWAY EXCAVATION 65 9.2 METHOD APPLIED FOR CONSTRUCTION OF SUB-GRADE 65 9.3 THE METHOD APPLIED FOR CONSTRUCTION OF BASE AND SUBBASE COURSE 66 9.4 THE CONSTRUCTION METHOD OF ROAD STRUCTURE 68 CHAPTER 10 HSE PLAN 74 10.1 GENERAL 74 10.2 SAFETY ORGANIZATION: 74 10.3 SAFETY PLAN: 75 10.4 SAFETY REPORTS: 85 10.5 NOTIFICATION OF ACCIDENT: 85 CHAPTER TEMPORARY WORK & PREPARATION 1.1 GENERAL Site clearing shall consist of clearing, grubbing, removing of top soil, and removing and disposal of all vegetation and debris within the limits except such objects as are designated to remain in place or are to be removed in accordance with specifications or instruction of the Engineer Major sequence and plan for construction Temporary Access road Construction of piling Construction of foundation Construction of superstructure Finishing works M&E works 1.2 SITE INSPECTION, ATTACHING BATTER BOARDS, SCAFFOLDING, Etc 1.2.1 Checking Site Conditions and Staking Out After verifying the conditions on site, the location of the building shall be indicated by staking out or other suitable method and this shall be inspected by the Engineer 1.2.2 Benchmarks Firmly install wooden or concrete stakes as benchmarks so as to prevent any movement, and provide curing around them A fixed non-moving object may be used as a substitute Benchmarks shall be inspected by the Engineer 1.2.3 Attaching Batter Boards After staking out the site, install batter boards at the corners and other important points of the building, and provide temporary making for setting line at a place where the work will not be affected The top of the batter board shall be planed using a planer and attached horizontally to the ground stakes with nails When attaching batter boards clearly indicate the location of the building and horizontal reference and ask the Engineer to inspect the batter boards 1.2.4 Scaffolding Scaffolding, landing stages, temporary enclosures etc shall be built with appropriate materials and structures in accordance with the labor law, building standard law, requirements for public disaster prevention in construction and other relevant laws 1.3 TEMPORARY ACCESS ROAD 1.3.1 Clearing and Grubbing and Tree Removal The Contractor shall clear and/or grub, including disposal as required all surface objects and all trees, down timber, rotten wood, stumps, roots, snags, brush, other vegetation, rubbish, and other protruding obstructions not designated to remain In area under roadway embankments, from which the topsoil or unsuitable materials are to be removed or which are designated to be compacted, the Contractor shall remove all stumps and roots to a depth at least 20 cm below the original ground surface and at least 15 cm below the bottom of the lowest pavement layer In roadway cut area, all stumps and roots shall be remove to a depth of not less than 30 cm below the finished sub-grade level Voids left after removal of roots shall be filled with suitable compacted materials as approved by the Engineer 1.3.2 Topsoil Stripping The Contractor shall remove the topsoil in area under roadway embankment or where designated by the Engineer, and stockpile / dispose of it to the approved area as directed by the Engineer When the topsoil will be used for dressing of the slopes of the embankment or other area as directed by the Engineer or as indicated on the drawings, the Contractor shall place and spread the stockpiled topsoil in such designated area After spreading, the topsoil shall be raked to form a smooth surface free from weeds, roots, sods and large stones Removal of topsoil shall be executed to the depth as directed by the Engineer, and the topsoil shall be kept separate from other excavated materials 1.3.3 Disposal of Cleared Materials All cleared material is the property of the Engineer and shall be used or disposed of as the Employer sees fit The Contractor shall haul all cleared material from the clearing and grubbing operation to locations designated by the Engineer No accumulation of debris shall remain on or adjacent to the right-of-way 1.4 MATERIAL STORAGE YARDS, CONSTRUCTION SHEDS AND OTHER TEMPORARY WORKS 1.4.1 Materials storage yards Material storage yards or construction sheds, etc shall be allocated and constructed to suit the stored material and depend on site organizing plan 1.4.2 Storehouses for explosives Storehouses for flammable materials such as paints and oil shall conform to the relevant laws and be situated as far as possible from buildings, construction sheds, material storage yards etc The roof and interior and exterior walls and ceilings shall be of fire-preventive construction or be covered with a fire protection material; each door shall be lockable, and provided with a "CAUTION: FLAMMABLES" notice and fire extinguisher 1.4.3 Contractor's Offices and other rooms The contractor's office, toilet, etc shall be provided Signboards displaying the name of the construction work, name of owner and other details shall be installed at a suitable location on the construction site 1.5 REMOVAL OF TEMPORARY UNITS AND OTHERS If a temporary construction is disturbing the progress of work or the use of other buildings within the premises, then the contractor shall negotiate with the Engineer for its removal In the event that there is no place to move the temporary construction, then part of the construction may be used if approved by the Engineer The temporary constructions should be removed, the construction area as well nearby areas cleared and cleaned and the ground surface leveled before the formal completion of the construction work CHAPTER EARTH WORK 2.1 GENERAL REQUIREMENT 2.1.1 General All necessary measures to prevent abnormal settlement, sliding of slopes and other disasters shall be taken during construction All efforts shall be made to prevent spills and scattering when carrying soil or outflow of mud due to water drainage Cleaning and washing with water shall be performed as required 2.1.2 Excavation and backfilling Excavation should be suited to the situation in surrounding areas, geology and groundwater conditions, and slope surface protection or landslide protection shall be employed in accordance with the relevant laws so as to prevent the collapse of sediment Where buildings adjacent to the excavation area are likely to be collapsed or broken, adequate measures shall be taken in advance to prevent such occurrences Where underground water supply or drain pipe, gas pipe or cables are likely to be discovered, a survey shall be conducted In the event that a buried object is found, it shall be carefully handled so as not to cause damage All necessary emergency measures shall be taken, and the final outcome shall be determined through discussing with the Engineer and/or the authority concerned All minor obstacles to construction work shall be removed The treatment of major obstacles shall be discussed with the Engineer The bottom of cutting shall be excavated without disturbing the ground, and inspected by the Engineer upon completion of the excavation 2.1.3 Drainage Rainwater, spring water, stagnant water, etc that may hinder construction shall be removed via drain ditches, catching basins or pumps Where unusual freshet is seriously affecting the execution of the work, this matter shall be brought to the attention of the Engineer Appropriate measures shall be taken before draining water from the excavated area so as not to influence the bottom of the cutting, the surface of slope, construction site or neighboring areas 2.1.4 Backfilling and Filling Prior to Backfilling, remove formwork and other objects located in the area to be backfilled Consult the Engineer in the event that formwork shall remain as they are Consult the Engineer if the excavated soils are not suited to the backfilling and fill Extra fill settlement or allowance may be required depending on the soils 2.1.5 Grading Grading (leveling) shall be performed for a width of approximately 1m around the building in order to drain away water 2.1.6 Disposal of Earth Generated during Construction Earth generated from the construction work shall be transported outside the premises and disposed of in a suitable manner in accordance with local regulations In the event that some of earth generated from the construction work can be reused, under consultation with the Engineer and/or the local authority 2.2 EARTH WORK SUPPORT Earthwork shall be supported safely and securely in accordance with the local regulations and/or the Engineer’s directions Earthwork supporting system shall be submitted to the Engineer for approval with calculation sheet During execution due attention should be given to the stress and deformation with a view to potential disasters When installing earthwork support works, constantly check and measure the adjacent ground for potential landslides Should any abnormal state be detected, adequate steps shall be immediately taken and a report made to the Engineer Removal of earthwork support structures shall be performed in a careful manner after verifying the safety level The holes left after steel sheet piles are pulled out shall be immediately backfilled with sand or other suitable material directed by the Engineer, thereby preventing deformation of the ground 2.3 METHOD OF EXECUTION 2.3.1 Excavation All excavation shall be carried out to the required lengths, depths, inclinations and curvatures as may be necessary for the constructions of the work or as shown on the drawings in whatever material that may be found, including top soil and the surplus soil shall be disposed of as VINACONEX E&C engineers may instruct Excavation for foundation shall extend a sufficient distance from the footing (approximately 50 cm) to create appropriate space for placing and removal of forms The bottoms of all excavation shall be leveled carefully, unless otherwise on the drawing or by VINACONEX E&C engineers’ instructions 2.3.2 Excavation Process - Machine Excavation The purpose of machine excavation is to speed up the process Follow this procedure, excavation machine can not break the underground soil structure which according to the design of foundation Excavator will not be able to excavate the small space, but that soil will be excavated by hand Anyway, after excavator has finished its work, the excavation pit is to be repaired by hand Pump The excavator will excavate each pilecap, the surplus soil will be transported by dumptruck to the disposal areas - Hand Excavation Hand-excavation can keep the ground surface of excavation pit evenly and the underground soil not to be broken Hand excavation is the only choice in the areas where excavator could not work The purpose of hand excavation is to make the surface of excavation pit to be smooth with small tolerance Checking-level pole will be used to correct the level of ground during excavation by hand 2.3.3 Inspection of Excavations All excavations are to be inspected and must be approved by VINACONEX E&C engineer before gravel and lean concrete is laid (in case the work is carried out by a sub contractor of VINACONEX E&C) The sub contractor shall inform VINACONEX E&C engineer in time to allow VINACONEX E&C’s inspector to make the visual inspection of the excavation works 2.3.4 Additional Excavation If it is necessary for any reason to form, extend and/or deepen foundations under or around any part of the work, the additional excavation shall be processed 2.3.5 Inspection before Filling No filling in shall be commenced until the concrete foundations have been inspected by VINACONEX E&C engineer in charge 2.3.6 Upholding Sides of Excavation When it is necessary, upholding the sides of excavations shall be processed to prevent any damage to adjacent structure and buildings caused by collapsing of sides and embankments of excavations 2.3.7 Timber, etc Left in Excavations Timbering, dust, debris, rubbish, etc Shall not be left in when excavations are being filled 2.3.8 Removal of Surplus Soil All surplus excavated material, rubbish and waste matter shall be removed from the site The place for disposal shall be selected by site manager or by sub contractor 2.3.9 Keeping Excavation Free From Water Powered pumping, drainage or otherwise shall be used to keep the whole of 10 - Fire alarm centre must be earthed Earthing must satisfy requirements of current earthing regulations 97 11.2 MACHINICAL WORKS 11.2.1 Fan installation process No Description Technical requirement Related technical document Identify position and fan type for installation Direction and connecting position must be compatible with installed ducting Shop drawings, Identify type and location of vibration absorber set sheets Mark fan positions, check position, dimension and of fan Cover to protect fans before transporting Surrounding working area must be free with warning signs Transport fans from construction site warehouse to installation position Hanging bolts must be in straight position Ensure vibration absorber to be stand freely and firmly Install hanging bolts and vibration absorber set Free space around vibration absorber must be > 10 98 technical data Install fans mm All surfaces of fans must be flat Position of connection must be suitable with installed fan ducting Check and adjust position After readjustment, each fan hanging bolts must be tightened with two nuts Fans freely rotating obstruction without Use nylon sheet to cover fans All ducts connected to fans must have flexible jointing All junctions must be tightened Clean and cover fans All air duct junctions must be sealed with silicon Connect electric 10 ducting and Use electric holes to connect fan motor Check and adjust connecting mission Technical completion report Hand over to inspection division 11.2.2 Grille / Diffuser installation process No Description Technical requirement 99 Related technical document Identify position and type of - Locate diffuser/grille position to be erected Drawing of diffuser/ diffuser / grille to be Diffuser / grille must be straight to directions grille, detailed All junctions must be sealed combination with light All outdoorinstalled diffuser / fittings and other grilles must waterproof equipment (fire installed Determine exact position for installation Install diffuser/grille Wall- mounted type 3.1 3.2 Erect grille frame diffuser / Erect diffuser grilles into frames / Type erected in ducting - Create holes in ducting be The front of diffuser / grille must installation drawings in detector) be covered with nylon to avoid scratch and dust Use nylon cover the front grille to of - Erect diffuser / grille 3.3 Ceiling mounted type - Erect hanging bolt - Erect diffuser / grille Check and adjust Clean and cover diffuser / - Technical completion report grille Hand over to inspection division 11.2.3 Ducting installation process No Description Technical requirement 100 Related technical document Determine positions that fan passing through floor (wall) - Sleeve must be suitable with floor (wall) Mark and drill holes (wall) Gap between sleeve and wall must be sealed with silicone Gap between sleeve and ducting must be sealed with Erect sleeve pipe into floor (wall) Mark and supporting erect rock wool Supports must be painted Supports must be aligned straightly, gap between two holder supports must conform with tender document Prepare ducting -Clean installation before invitation Ducting junctions must be sealed with silicon - Cover insulation (if any) Install ducting supporting into - Connect ducting with other ducting Cover insulation Check ducting and clean place to avoid scratches or damages holder Ducting must be placed in junction Ducting must be aligned straightly on the same height - Technical completion report adjust positions Hand over to inspection Division 101 Shop drawings, tender invitation document 11.2.4 Concealed FCU (Fan Coil Unit) Installation No Description Technical requirement Related technical document Mark FCU’s position to be All inlet pipes of FCU must installed conform to drawings Move FCU to location to be Do not dismantle packing Shop drawings, tender invitation before installing Hanging must be straight Install FCU installed required bolts and ensure dimensions Clean and cover FCU than 10 mm Connect ducting, water pipe direction and electric lines Erect supplementary drainage Check and adjust FCU Anti vibration mount must be located in isolated and stable place Space surrounding anti vibration mount must be higher Ensure condensed water drains of FCU have 1% slope toward water drainage Use carton box to cover it Welded joints (if any) must be Hand over to inspection division and test run clean and protected with paint Electric connections must be tightened Ducting connected to FCU 102 document must have sleeve flexible Return air grille must have hole to allow repairing and Intervention Auxiliary must have 1% drains drains and connect water slope toward water drainage drainage pipes direction Water reservoir (if any) must have U shape and a differential pressure > TSP ( mm H20) + 15mm After Adjustment, each hanging bolt is required to tighten with two nuts to avoid selfdismantling -Technical completion report/ Certificate 11.2.5 Plumbing installation Domestic water supply piping execution for the Works currently is required very high standards To met the technical requirements and standards, with the supply of full package of equipment and equipped with high quality tools, the staff of qualified engineers and skilled workers should be carefully trained on the project Large roofed warehouse to store pipes Check pipe quality during the transportation to construction site Well keeping pipes in dry and cool place Connect pipes with fittings, pipes with pipes: depending on types of used pipes, specific connection method should be used Pipe GI: There are methods of connecting pipes Welding method  Check tools (welder and cutting machine, power supply source, 103 CO fire extinguishers)  Check labour safety instruments  Clean pipes  Check execution drawings, pipe installation position  Transport pipes to execution location and put pipes into holder or plat surface  Avoid scraps going to pipes when cutting and sharping  Lay pipe to be connected on a pwell prepared flat surface (Fig and 4)  After checking safety, start connecting pipes  If the pipe is too long, anti-expansion soft joints should be used  Clean iron rust by using iron brush before and after welding  Seal ends of pipes with covers, test pressure (invite consultants/supervisors/supervisore to inspect)  Check pipe height (according to execution drawing), direct pipes in straight direction (invite consultants to inspect) (See figures 1.5 and 1.6)  Check pressure according to technical requirements (invite consultants to inspect) 104  Prepare acceptance document (invite consultants to inspect)  Seal pipe ends tightly with nylon or glue and sticking plaster  Tighten pipe clamp (Refer figure 1.6)  Equip pipe with paints and anti- rust paints for welded joints Threaded connection  Check thread device and thread tool  Cut, sharpen and polish pipes  Wire or spread sealant glue and sticking plaster before connecting  Connect pipes (Refer figure 1b)  Other operation steps are in sequences as connecting by welding method PPR pipes For PPK pipes connection between pipes and pipes, pipes and fittings are required to have specialized welder (thermal welding) supplying 220V power source to weld pipe at 260oC Steps are as follows: 105  Check positions (Refer execution drawings)  Check execution tools and place pipes into plane ( Refer figure 2.1)  Mark the pipe part contacting with Fitting (equal to Fitting’s depth)  Contact welded joint ends with pipes and Fittings  After thermal treatment sucess, withdraw pipes and fittings out of the device then compress pipes with fittings, hold tightly in regulated time (Refer figure 2.4 and time schedule)  For pipes of 50 diameter, compress by compressor machine not conducted by hand  For 110 diameter pipes, weld ends to ends directly and compress by steam 106  After finishing pipe connection, remaining steps are carried out as GI pipe connection method PVC pipes:  Transport pipes to location to be installed  Check installation position (Refer execution drawing)  Clean pipes and fittings need to connect  Cut, sharpen and polish pipes  Spread glue and glue and sticking plaster into pipe sections contacting with fittings  Press pipes and fitting need to connect, hold tightly for one minute  Remaining steps are carried out as GI connection methods Copper alloy pipes:  Prepare welder, oxygen reserve device, acetylen, solder stick  Cutting tool of copper alloy pipes  Polish pipes after cutting  Remaining steps are done as GI connection method  Inox pipes:  Prepare specialized welder to weld inox  Remaining steps are done as GI connection method 11.2.6 Method of connecting pipe with fittings Method of connecting pipes with lavabo, WC, Sinic, BathTub, Shower: - Prepare execution instruments - Check installation position (execution drawings) - Check equipment holders - Check fittings, place fittings into positions need to install (Refer execution drawings) 107 - Check pipe pressure test documents - Fix and adjust fittings (Refer detail installation drawings) in holders or floor, wall - Check and clean pipes, determine water chilling piping - Connect pipes with fittings (Refer particular installation figure) - Check and adjust (invite consultants to inspect) - Test pressure in accordance with technical requirements (invite consultants to inspect) - Cover the fittings with nylon - Prepare Testing document (invite consultant to inspect) - Conduct training course - Prepare hand over and acceptance documents (invite consultants to inspect) Connect pipes with seal surface (flanges), valves, hole joints with filter, pump, pressure meter - Check fittings (invite consultant to inspect) - Transport fittings to location need to install - Check installation position (refer execution drawing) - Check pipe pressure Test documents(certified by consultants) - Clean fittings - Clean pipes - Prepare and check device holders (refer detail installation drawing) - Place fittings into needy installed position - Connect pipes with fittings (refer illustration drawing) 108 109 - Adjust fittings (invite consultants to inspect) - Check altitude (refer execution drawing) - Seal ends of pipe to test pressure in accordance with technical requirements (invite consultants to inspect) - Check acceptance documents - Cover fittings with nylon 11.2.7 PIPE- EQUIPMENT AND AUX EQUIPMENT HOLDER Pipe holder: - Manufacture holders (refer execution drawing) - Paint holders - Manufacture pipe clamps - Check holder, two head screws, hanging bolts according to pipe size - See execution drawing and position by drilling to capture holders 110 111 ... backing of ordinary roof waterproof layers Type Number of trowel finishes Wooden trowels Metal trowels Type A Type B 1 Types of Trowel Finishing 5.7.3 Methods Leveling method: - Determine origin of. .. to achieve high quality of concrete work, steel form will be used for the project Our amount of steel form is enough to meet requirement of the project In case of lack of form, additional form... safety of project - Arrange and manage the staff to study all the technical, quality, material, technological requirements so as ensuring the quality of project - Set up working method of project