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1、Construction Method StatementFor Beam, Column Formworks and supporting frames of 1312-STR-12001. Scope12. Material13. Construction methods and technical measures21. ScopeThe method statement herein is compiled by mainly focusing on installation of column and beam formworks of 1312-STR-1200 and their2、 supporting frames.2. Materials1)Plywood ( =15mm) shall be adopted to precast formworks of beam and column. The wooden board(50100mm) and the steel tube( 48.3 shall4.0) be used to respectively support the inner kneel and outer kneel of formworks2)The steel tube ( 48.3 4.0) shall be used to make supp3、ort of beam and column formworks and to erectscaffoldings.3) The upright monkey ladder shall be made of aluminum alloy and the planks will be made of steel.3. Construction methods and technical measures3.1.To ensure the stability of supporting frames, the concrete pouring of column and beam shall be4、 done separately by three times .The first time of pouring for column shall reach the elevation of 109000mm and the second time of pouring for column shall reach the elevation of 116850.Pouring the for the part of the column above elevation of 116850mm shall be done together with concrete pouring fo5、r the beam. The supporting frame of beam formwork shall be connected rigidly to the poured column prior to starting concrete pouring on the beam.3.2.Method of reinforcement for column formwork.C1/C1a（ sectional dimension 850750mm）、C2（ sectional dimension 750750mm）5 ways of keels inside eachside face6、 of column formwork and double steel tubes with a spacing of 500mm for column hoop. Tie bolts 12 withspacing of 500mm installed inside side face. The upper, middle and lower column hoops of column formwork shall beconnected to support outside to avoid tilting or inclinedness.3.3.Methods of reinforce7、ment and supporting for beam formwork. See table 3.1.2.Table-3.1.2Code1GX1/5/6/1GX21GX31GX4/11GY1/4/51GY21B11B27/8/9 、1B3GY3、1B4Sectional Dimensions4007007001700135001040060065010006009007509001005000Formwork ofInner keel offormwork35543444bottom of beam（ line ）Spacing between outer keels of0.450.608、.60.60.450.50.50.5formwork(m)Two sidesSpacinSupport on theof0.91.21.21.21.01.21.21.2g ofbottom of beamformwork(mposts)Span of beams (m)0.90.60.60.60.90.50.50.5Bay of posts(m)1.51.51.51.51.51.51.51.5Bearing post additionally fitted02210111on the bottom of beam （line ）SideInner keel of formworkformwor9、k（ line ）45754555of beamOuter keel of formwork(line)0.90.60.60.60.450.50.50.5Spacing （ m）TieDiameter12161612/121212BoltH （ m）0.30.50.60.5/0.40.40.4Code1GX1/5/6/1GX21GX31GX4/11GY1/4/51GY21B11B27/8/9 、1B3GY3、1B4l（m ）0.90.60.60.6/0.50.50.5Note: “ H” indicates the distance from tie bolt to the bottom of10、 beam.“ I ” indicates the spacing on the direction ofbeam spans. The upper parts and lower parts of beam formwork shall be connected to the support tightly by steel tubecouplers.3.4.Procedure and requirements for erection of supporting frame.1)Procedure of erection： Place base plate(board) with a th11、ickness of 50mm Erect base lift Connect the post andbase lift by couplersInstall the first runner and bearer and connect them to the post tightly with couplersRepeated the last stepErect cross bracingsLay steel planks.2). Lay the base plate (base support) and place the base lift as per the prioritie12、s of beam locations. The longitudinal base lift shall be fixed to the post with right angle couplers and the post shall be not more than 200mm to the bottom of steel tube. However, the transverse base lift shall be fixed to the post with right angle couplers and the post shall be close to the undern13、eath of longitudinal base lift.3) The posts shall be erected as per the sequence of positioning. The posts shall be connected and fixed to the longitudinal and transverse base lifts. For erection of posts, the joints on each lift height shall be pair joint couplers (except for the top height lift) a14、nd ensure that the pair joints on the same section shall keep some space (50% of the sectional size)4).The bearer shall be set on the inner side of the post and the length of single post shall be not less than 3 bays. The bearer shall be connected by pair joint couplers and conform to the following 15、rules: the ends for connection of two adjacent bearers shall not be set in the same bay or same lift height. Any two adjacent connection joints not in the same bay or lift height shall keep a distance of not less than 500mm on the horizontal direction. The distance fromeach joint centre to the neare16、st main joint shall be not more than 1/3 of the longitudinal spacing.5).The connection between runner and bearer on the bottom of beam formwork shall be connected to the post bydouble couplers.6).Add one bearer in the middle of two bearers on the top lift of supporting frame. The top of the bearer s17、hall be tightlyto the surrounding framed supports.7) The erection of cross bracing: the cross bracings shall be erected along with the scaffolding structure. The bracingson the bottom liftshall be all supported by the base plate.The method of lapjoint shallbe adopted forbracings,connection. The leng18、th of lap joint shall not be less than 1m and fixed by 3 rotating couplers. The distance from theedge coupler?s cover on the top to the top of the post shall be not less than 100mm.The bracings shall be fixed to theextended part of runner or the post by rotating couplers. The central line of rotary 19、coupler shall keep a distance of notmore than 150mm to the main joint.8). Rigid connection shall be done in every 3 meters vertically between the formwork support, scaffolding and thecolumn of the frame around which the construction work has been completed.9). Cross bracings shall be erected respect20、ively on the ends of outer sides , corners and the central vertical face with adistance of less than 15m of the scaffoldings .The sequence of cross bracing erection shall be from the bottom to thetop. The width of cross bracing is 6m, which makes an angle of 4560with the ground.10) .The wall fastene21、rs of the scaffoldings shall be laid out horizontally close to the main jointas per the rule of“ two liftheights and threebays ” . The distance between fasteners and main joints shall be not more than 300mmm.11) .Planks shall be fully laid on the working platform with sound firmness and tied with st22、eel wire #14 on three runners.Both ends of the scaffolding planks shall be reliable and fixed so as to prevent capsizing.12) .Guardrails: Erect two-line guardrails above the working platform and the upper line of guardrails (top rail) shall be 1.2m tall while the mid rail shall be set in the middle 23、line of the lift height. Toe boards shall be erected with a height of 180mm to the platform.1) Access for going up and down ：Place 1 set of upright monkey ladder respectively on the southwest corner and northeast corner of scaffoldings. A rest platform shall be erected at the height of 4.5m of the u24、pright monkey ladder.3.5.Dismantling of supporting frame.1).The technician shall conduct a technical disclosure for all the working crew members who are going to perform dismantling work prior to commencement of dismantling work and all the attendees are required to sign on the written form of this 25、said technical disclosure.2). Arrange the power cables properly before dismantling the supporting frame. For the cables that cannot be dismantled or put aside, they shall be buried by soil.3). Barricade the area with rope or warning tape prior to starting dismantling work. The work can be started on26、ly in the presence of watchman, HSE personnel and foreman.4) During dismantling the scaffoldings, the workers must wear harness and be equipped with tool bag. The workersshall not hold the steel tube and wrenches simultaneously .The tools shall be kept in the tool bag after use.5).The procedure for 27、dismantling scaffoldings: From the top to the bottom, opposite to the sequence of erection. Thegeneral sequence for dismantling: guardrails scaffolding planks cross bracings runner bearer postpassed onto the ground couplers removing dismantled parts stacking and storing as per the specifications.6) 28、Someoneshall be appointedfor monitoringthe dismantlingwork for structuralform of scaffoldings .Thecrewmembersshallacknowledgedwiththeirrespectivegivendutiesand work underunitedinstruction .Theworkingpostsplatform shall be with enough space7) It is not allowed to dismantle a vertical platform from 2 29、different points or from 2 different lift heights at the same time .Do not move to the next one until the last one has been completely dismantled. If the dismantling is being done at 2 different positions of the scaffolding system, the height different shall be within 2 lift heights so that the stab30、ility ofthe structural form will not be destroyed.8) The wall fasteners shall be dismantled along with the scaffoldings lift by lift. It is not allowed to dismantle the wall fasteners of the whole lift before dismantling the scaffoldings. When the dismantling of scaffoldings has come to the height o31、f last post remaining (Approximately 6.5m), the wall fasteners shall be dismantled when temporary bracings have been erected and strengthened at suitable locations.9) The dismantling work of long post or runner (bearer) shall be done by two workers in case any undesirable incident occurs10) The work32、ers cannot sit on the scaffolding platform being dismantled or any unsafe place during taking the break. Horseplay is also strictly forbidden during dismantling the scaffoldings.11).The dismantled post or any component part shall not be thrown causally .Instead, the dismantled parts shall be dropped down with being tied to the solid rope and stacked as per their categories.12).The workers can be permitted to leave the workplace only when it has been confirmed by appointed personnel that this workplace is free from any potential hazard.