砼浇筑工序交底PPT课件

1、Methodology of ConcretingFORMWORKREINFORCEMENTEMBEDDED PARTSFINISHESAGGREGATES PROCESSINGCONCRETE MIXINGCONCRETE TRANSPORTATIONCONCRETE PLACINGCONCRETE CURING第1页/共59页1. Formwork第2页/共59页Formwork Formwork shall have sufficient strength, stiffness and stability, to reliably withstand the weight of fres

2、h concrete, and pressure load during construction. Key words: strength, stiffness, stabilityInstallation第3页/共59页 Formwork shall be precisely aligned, to ensure concrete structures shape, size and location meet the requirements. Key words: precisely alignedFormworkInstallation第4页/共59页 Surface of Form

3、work shall be neat and smooth, joints of formwork shall be tight and keep from leakage, to ensure the appearance quality of concrete. Key words: neat and smooth, joints tightlyFormworkInstallation第5页/共59页FormworkTolerances第6页/共59页FormworkTolerances第7页/共59页FormworkTolerances第8页/共59页 Materials and equ

4、ipment that over weight is not allowed to stack on the formwork and its supports. During process of concreting, condensed mortar should promptly clean up to ensure the surface of formwork are smooth and neat.FormworkMaintenance第9页/共59页 In the process of concreting, supervisor shall be on site check,

5、 adjust the formwork, in case of any deformation or displacement happened. Stop pouring, if necessary and keep each pouring record.FormworkMaintenance第10页/共59页 In the process of vibrating, vibrators shall be kept from embedded anchor bar, to avoid deformation, if deformation happened, adjustment mus

6、t be done.FormworkMaintenance第11页/共59页 Removal of formwork before the specs time is prohibited, to avoid improper removal method causing damage at concrete corner and surface. Formwork removal in winter or any cold weather shall meet the temperature requirements.FormworkRemoval第12页/共59页 Removal of f

7、ormwork shall follow the principle “ remove start from the first installed”, removing shall be in order. Special tool shall be used for formwork removal, to avoid damage to formwork.FormworkRemoval第13页/共59页 Removed formwork shall not be threw casually, to avoid deformation of them. Removed form work

8、, brackets and accessories shall be promptly clean up and keep custody in category. Badly deformed or broken formwork shall not be used and FormworkRemoval第14页/共59页Formwork第15页/共59页Formwork第16页/共59页2. REINFORCEMENT第17页/共59页 Fabrication and clean. Storage of rebar. Placing of rebar. Splicing of rebar

9、.REINFORCEMENT第18页/共59页REINFORCEMENTFabrication and Clean Steel reinforcement, before being positioned, shall be free from loose mill and rust scale, oil, grease and from coatings that destroy or reduce the bond. 第19页/共59页REINFORCEMENTFabrication and Clean Reinforcement shall be accurately formed to

10、 the dimensions indicated on the Drawings. Bars with kinks or bends not shown on the Drawings, shall not be used. Reinforcement shall not be straightened or re-bent in a manner that will injure the material.第20页/共59页REINFORCEMENTStorage Reinforcement shall be stack separately and label different typ

11、es of reinforcement for positive identification of the manufacturer, size and productive run or other number which relates to the last certificate furnished by the manufacturer. 第21页/共59页REINFORCEMENTStorage All reinforcement shall be stored under cover on wooden or concrete supports at least 6 inch

12、es above the ground.第22页/共59页REINFORCEMENTPlacing of rebar Reinforcement shall be accurately positioned and secured against displacement by using annealed iron wire of No. 16 SWG and lashings at intersections, and shall be supported as required by concrete or metal supports, spacers or metal hangers

13、. 第23页/共59页REINFORCEMENTPlacing of rebar The reinforcement after placing shall have sufficient rigidity and stability.Negative example: spacing of reinforcement is not right.第24页/共59页REINFORCEMENTPlacing of rebar Setting out shall start from the center point to sides, measure out the location of the

14、 vertical bars, setting out of horizontal bar can be placed in vertical reinforcing steel or on the formwork.第25页/共59页REINFORCEMENTPlacing of rebar Prior to place of rebar, erection bar shall be installed. Placing of rebar shall be in order, first erection bar then normal bar, to avoid rework.第26页/共

15、59页REINFORCEMENTPlacing of rebar All support and connectors shall not exposed outside of the concrete, and cause any damage of concrete either.第27页/共59页REINFORCEMENTPlacing of rebar If any rebar rusted due to prolonged exposure, the rust must be promptly removed by using steel brush. Prior to placin

16、g concrete, inspection shall be took by supervisor and take notes(records).第28页/共59页REINFORCEMENTSplicing of rebar Method of welding for splicingOverlap welding- 2 sides weldingOverlap welding- 1 side weldingRod welding- 2 sides weldingRod welding- 1 side welding第29页/共59页REINFORCEMENTSplicing of reb

17、ar Method of welding for splicingSleeve ( casing/ threaded coupler )第30页/共59页REINFORCEMENTTolerances第31页/共59页3. CONCRETE PLACING第32页/共59页Concrete Placing Block Preparation Concrete Placing Spreading and Vibrating Defects Treatment第33页/共59页Concrete Placing Keep blocks from water.Block PreparationBloc

18、k to be concretingWater bund第34页/共59页Concrete Placing Label different concrete partitions to avoid error placing.Block Preparation3000 psi 1500 psi第35页/共59页Concrete Placing Label concrete layer control line and top line.Block PreparationControl lines第36页/共59页Concrete Placing Use high pressure water

19、to clean up the block and remove stagnant water. Prior to placing of concrete, inside of block shall not have any debris, all joints shall be moistened but free of stagnant water. Prior to placing of concrete in summer sunny days, blocks shall be sprayed water for cooling.Block Preparation第37页/共59页C

20、oncrete Placing Method of placingPlacing of concreteTile Methodwidthflow第38页/共59页Concrete Placing Method of placingPlacing of concreteStairs MethodbermWidth123456789101112131415161718192021flow第39页/共59页Concrete Placing Concrete free falling height shall not more than 1.5m.Placing of concrete1.5m1.5m

21、Positive ExampleNegative Example第40页/共59页Concrete Placing Concrete shall be promptly spread and vibrated, to avoid stacking. Special parts such as reserved slots and embedded instruments shall be carried out by manual.spreading and vibrating第41页/共59页Concrete Placing Time for vibrating shall take the

22、 significant of no longer sinking of concrete, no large bubbles escaping and mortar coming out.spreading and vibrating第42页/共59页Concrete Placing Arrangement for vibrating when placing bulk area concrete spreading and vibrating1.5R1.5R1.5R4 3 2 15 6 7 8rectanglequincunx32 154 3 2 15 6 7 4Positive Exam

23、pleNegative Example第43页/共59页Concrete Placing Vibrating rod shall be vertically inserted into concrete as possible, or slightly tilted, but the incline angle shall be less than 45, and keep the direction for each time vibrating.spreading and vibratingVerticallyTiltedError4545 第44页/共59页Concrete Placin

24、g Vibrating rod shall be quickly inserted and slowly raised up, in order to get sufficient vibrating. When placing concrete on the slope, vibrating rod shall be inserted vertically, and lower portion shall be vibrated firstly.spreading and vibrating第45页/共59页Concrete Placing If segregation happened,

25、the part of material shall be removed, and shift concrete from beside to fill in. spreading and vibrating第46页/共59页Concrete Placing Slip tube/ Chute shall be straight and smooth, each section shall be connected securely. At the end of chute, bezel and vertical hopper shall be added, to reduce the seg

26、regation of concrete.Slip tube / Chute pipe / Chute 第47页/共59页Concrete PlacingSlip tube / Chute pipe / Chute Chute/ Slip tube2.0mThe outlet of chute shall be vertical to ground, and the length shall be more than 2 meters, to reduce segregation of concrete Positive exampleNegative example第48页/共59页4. CONCRETE CURING第49页/共59页Concrete CuringAll concrete surface shall