2.
4.
5.
Column Slab Reinforcement positioning 5.
Carry out inspection and inspection according to the specification requirements (concrete strength, thickness of reinforcement protective layer, axis deviation, floor elevation < clear height; section size, perpendicularity, flatness,), keep original records and make site identification.
Part I: Civil Engineering 1.
The effective thread length of the screw head of the standard joint shall not be less than 1 / 2 of the length of the connecting sleeve, and the allowable error is + 2p.
3.
6.
After the cast-in-place structure is accepted, the elevation, axis, positioning identification and data shall be put on the wall for the next process or working face handover..
key points of operation 1.
2、 Quality effect 7 quality control of concrete pouring process I.
When processing rebar threads, water-soluble cutting lubricant shall be used; Do not use engine oil, lubricating fluid or no lubricating fluid for threading.
When the qualified rate is less than 95%, the sampling inspection shall be doubled.
Structural column reinforcement reservation I.
Only qualified ones can be used.
The thread heads that pass the self inspection shall be randomly sampled and inspected by the quality inspector.
In order to prevent missing tightening of the joint, after each joint is tightened, it must be marked with red paint on the joint, and unqualified ones shall be marked with white for inspection.
The spacing frame is temporarily fixed between the spacing frame and the scaffold to ensure that the spacing frame is horizontal and corresponding to the column sideline.
After the joint is spliced, the two screw heads shall be pressed against each other in the center of the sleeve, and the exposed screw threads at both ends shall not exceed 2 complete screw threads.
It shall be arranged in quincunx (or horizontal ladder reinforcement shall be set, the spacing shall not be greater than 2m, and there shall be no less than 2 for each section of wall); The cushion block of the protective layer shall be evenly fixed on the reinforcement mesh, and the spacing shall not exceed 100cm.
The thread heads processed by one shift shall be taken as an acceptance batch, and the random sampling inspection shall be 10%.
Before stirrup binding, the spacing frame is used to limit the position of vertical reinforcement.
If necessary, processing measures shall be taken, and at least 2 stirrups shall be set at the top to prevent the deformation of joint bar.
Wooden squares shall be added on both sides of the upper opening, and shall be sealed and protected with wooden formwork until it is opened during concrete pouring.
key points of operation 1.
It is not allowed to cut with gas cutting.
Inspection and testing tools meet the regulations, and personnel work with certificates or have testing ability.
The upper side opening formwork of the post cast strip formwork of the cast-in-situ slab shall be consistent with the saw groove at the position of the reinforcement, and shall be firmly installed, or it shall be firmly supported with steel wire (plate) mesh.
The fabrication of concrete test blocks is standard, and the quantity meets the requirements.
2.
4.
4.
Stirrups shall be placed after the bottom reinforcement of the cast-in-situ slab is laid, the spacing shall not be greater than 500mm, and shall be firmly bound with the upper slab reinforcement.
The post cast strip concrete shall not be removed before pouring; The floor passage shall reserve the frame opening according to the specified position in the scheme, and the post cast strip plate surface shall be protected and strictly implemented in the implementation process.
5.
6.
The end of reinforcement blanking shall be flat without horseshoe shape or deflection.
5.
Quality control of delivery inspection of commercial concrete, mainly slump inspection.
The position of trapezoidal reinforcement shall avoid the overlapping length of reinforcement.
According to the building construction plan, the position of structural column shall be marked with red paint on the erected formwork.
2、 Quality Effect 2 positioning of Wall Column Slab Reinforcement I.
Protective measures for structural column reinforcement are in place.
The diameter and length of the processed steel wire head shall be checked with a thread gauge.
3.
The spacing of vertical trapezoidal reinforcement shall not be greater than 2m, and there shall be no less than 2 in each wall section.
The supervision and control of concrete vibration (the vibrator controls the moving distance of the vibration point to be no more than 1.5 times, the action radius of the vibrator < about 90cm = "" >, the vibrator enters 5cm into the lower layer, inserts and pulls out slowly, and the shift handover procedures of the vibrator shall be completed to avoid missing vibration) shall be in place.
2.
Timely curing and protection after concrete pouring (limit premature loading).
7.
A reinforcement positioning frame is added 5cm and 50cm higher than the top surface of the floor.
operation points 1.
The joint bar of structural column shall be firmly bound with the reinforcement of beam and slab.
The specification of reinforcement shall be consistent with that of the connecting sleeve, and the type, pitch and external diameter of reinforcement thread shall be matched with that of the connecting sleeve.
Straight thread connection of reinforcement I.
When connecting the reinforcement, align the axis and screw the reinforcement into the connecting sleeve.
3.
The ladder bars of wall reinforcement and trapezoidal reinforcement shall be bound and fixed.
3.
key points of operation 1.
Shear wall reinforcement positioning 4.
5.
Water retaining platform shall be added after concrete pouring on both sides of the post cast strip of the basement roof, and the post cast strip of the basement exterior wall shall be implemented according to the design scheme.
2.
When the qualified rate is still less than 95%, all thread heads shall be inspected one by one.
4.
The time and connection of two or three times of concrete surface finishing shall be controlled in place.
The key of frame column reinforcement binding is to control the vertical and relative position of longitudinal main reinforcement.
Before binding the reinforcement, the vertical reinforcement shall be straightened and corrected in place.
2、 Quality 8 fresh concrete pouring and maintenance control 9 quality inspection lot acceptance of cast-in-situ structure i.
2、 Quality effect 6 post cast strip formwork erection I.
key points of operation 1.
4.
2.
3.
The post cast strip formwork erection must adopt an independent design system, which will not affect the installation and dismantling of the full hall scaffold, and the upper and lower vertical poles are placed on the same axis.
The qualified wire head shall be protected with a protective cap.
key points of operation 1.
The disposal of quality defects of cast-in-situ structure shall be carried out according to the approved disposal scheme.
No collision is allowed during concrete pouring.
3.
And ensure that the screw thread of the reinforcement connecting sleeve is clean and intact.
After the wall reinforcement mesh is bound, the cement support and protective layer cushion block can be added.
The bottom of the embedded vertical reinforcement of the structural column cannot be directly placed on the formwork to prevent the reinforcement from being exposed.
2、 Quality effect 3.
The cement support and the wall reinforcement shall be bound firmly with binding wires, and the spacing shall not exceed 80cm.
Fabrication of bending anchor for structural column reserved reinforcement meets the requirements of drawings and specifications; The welding quality of the embedded steel plate (and reinforcement) connected to the top of the structural column is guaranteed.
It can be cut with grinding wheel saw or toothless saw on site.
According to the requirements of drawings and specifications, draw processing drawings of trapezoidal positioning reinforcement, column reinforcement positioning frame, stirrup, cement support, etc., and process and manufacture or purchase finished products after being reviewed by the technical director.
2.
The concrete shall be transported in time (the front desk feeding personnel and the backstage construction personnel shall keep the information unblocked, and the concrete discharge shall not be too concentrated).
