I. Raw materials
Before the steel bar enters the site and is unloaded, check the factory certificate, test report, steel bar identification plate, the identification on the steel bar and the appearance quality of the steel bar. The name of the supplier, the brand of rebar, the grade, the heat number (batch number), the specification, the weight, etc. should be consistent.
The brand of steel bar should meet the requirements of the contract, and the specific contract should be subject to the project contract, and the use of brand steel bars outside the contract must have approval documents.
After the steel bar enters the site, it must be completed within 24 hours of inspection, witness sampling, witness inspection, and shall not be used before the inspection results are out, and the raw materials shall be sealed on the spot.
The steel bar can be used only after passing the inspection; The unqualified steel bar raw materials should be processed with image records and written information.
All steel bars used in the main structure must be processed on site, and off-site processing is not allowed (off-site processing must be approved by the supervisor and Party A, and regularly sampled for inspection).
Strip strapping delivery form
Disc delivery form
Measured and accepted strip steel
Disc steel measurement and acceptance
Second, construction equipment
3. Site and transportation
Raw materials are stacked separately from semi-finished products
Material identification plate, 600*450mm (different from material stacking identification plate)
Fourth, steel bar processing
1. The semi-finished steel bar processing workshop must hang the steel bar processing material list to ensure that the steel bar processing is accurate and the anchorage meets the requirements;
2. The position of the column head that cannot be tied manually must be processed and welded into a reinforcement cage as shown in the figure, and the beam reinforcement must be sunk to the predetermined position together when the beam reinforcement binding is completed.
5. Standard Practice
1. The wall column reinforcement binding requires drawing line binding, the horizontal (stirrups) steel bar spacing meets the design requirements, and the horizontal bar or stirrups are tied in place at the intersection of each main reinforcement, and it is strictly forbidden to jump and tie them.
2. Ladder bars can be used for the binding of the steel bars between the shear wall and the frame column to control the spacing, position and thickness of the steel bar.
3. Before pouring concrete, the main reinforcement is protected from pollution with PVC pipes.
4. Set ladder bars or stirrups at a distance of 500mm from the pouring plate surface to fix the main bar of the column to prevent deviation.
5. The diameter of the wall and column reinforcement ≥ 25mm, and it is advisable to use mechanical joints.
6. The diameter of the wall and column reinforcement is 12m≤d≤22mm, and electroslag pressure welding is adopted.
7. The spacing of the main reinforcement of the beam reinforcement binding is evenly distributed, and the stirrups are tied in place (the intersection of the stirrups and each main reinforcement must be effectively tied firmly).
8. The diameter of the main reinforcement ≥25mm, and the mechanical joint is adopted; The main reinforcement of the beam ≤20mm adopts lap welding or lashing lap joint.
9. When the steel bar is cut, it should be cut by a toothless saw, and its end section should be perpendicular to the axis of the steel bar and should not be warped.
10. The number of complete teeth of the steel bar thread matches the diameter and meets the requirements of the specification, and the installation must be done with a torque wrench, and the exposed complete thread buckle shall not be greater than 2P.
11. At the junction of the main and secondary beams, the stirrups in the direction of the main beam are tied at the junction position according to the spacing of the design drawings
12. Schematic diagram of concrete pouring at beam-column nodes
13. Beam and column node reinforcement binding
14. Set up a quick and easy steel wire mesh at the junction of beams and columns, and pour high-grade concrete first, so as to prevent low-grade concrete from flowing into high-grade components
15. The first row of reinforcement and the second row of reinforcement of the beam reinforcement are separated by separating reinforcements, and the diameter of the separation reinforcement ≥ the diameter of the main reinforcement or 25mm; The separator bar is set 500mm away from the support side, and every 3m in the middle.
16. When the plate gluten is anchored on the side support, it must be bent down directly to the inner side of the outermost steel bar of the beam beyond the central axis of the beam
17. The plate reinforcement adopts double-layer two-way + separated reinforcement, and the continuous reinforcement form is canceled
18. The gluten anchor end is firmly tied with the beam stirrup (main reinforcement) and the main reinforcement (horizontal reinforcement) of the wall, and the gluten binding should be fully tied
19. Before the bottom rib of the plate is tied, draw a line to control the spacing, and it is recommended to use elastic line control
20. The plate gluten is fully tied (the vertical and horizontal steel bar handover positions must be tied), and there shall be no 'one tied one by one' jump binding form
21. The size of the reserved opening on the floor is 200~800mm, and the hole is reinforced.
22. Increase the radial steel bar with the same diameter as the plate gluten at the positive angle in the plate (the diameter and length are subject to the design)
23. Column and wall reinforcement cushion block: the wall and column are made of finished plastic inner braces, and the vertical and horizontal spacing is ≤ 600mm; The main reinforcement cushion block of the column is made of finished plastic cushion block, which is set ≤ 600mm along the corner of the column, and the vertical and horizontal spacing of the wall is ≤600mm
24. Plate (beam) bottom reinforcement cushion block: prefabricated cushion block is used, and the plate spacing is 1000*1000mm; The bottom of the beam is arranged 2 out of every 500mm and placed at the corner reinforcement position
25. Plate gluten cushion block: H-type prefabricated cushion block is adopted. The pitch is 600*600mm
26. Lap welding of steel bars: the surface is smooth and smooth, without quality defects such as depressions, welding nodules, cracks, pores, undercuts, slag inclusions, etc., and it is strictly forbidden to operate in rainy days.
27. Electroslag pressure welding: the protruding surface of the welding ladle shall not be less than 4mm, and there shall be no eccentricity, pores, cracks, undercuts, slag inclusions and other defects, and it is strictly forbidden to operate in rainy days
28. The buried pipe on the wall is welded and fixed with steel bars
29. The reserved hole on the reinforced concrete wall adopts the steel mold embedded positioning (the four sides are at a certain angle to facilitate the removal of the mold)
30. The broken stirrups are welded with the waterproof steel plate
31. Pre-embedded PVC waterproof joints are used in reinforced concrete.
32. The embedded wire box is reinforced with steel bars, and the cross position is firmly welded with the steel bars of the wall
33. The pipes that pass through the floor slab such as downpipes and floor drains are made of finished PVC water-stopping joints, and the double control lines on the template are used for accurate positioning
34. Steel bar processing and forming hanging identification (use part, specification, quantity, etc.)
35. Set up the process acceptance card on site
36. After the beam binding is completed, the bottom of the beam is cleaned by a vacuum cleaner and the beam is sunk.
37. Effect after the completion of plate reinforcement binding (cleaning up the garbage on the board surface)
6. Material stacking
The raw material yard of strip bundling steel bars requires the site to harden the ground and not accumulate water, and different types of steel bars are separated by channel steel, and each type of steel bar is hung with eye-catching identification plates, and the stacking height limit is ≤ 1.2 meters
Requirements for stacking identification of raw materials for strip bundled steel bars: clearly mark the manufacturer, model, specification, furnace (batch) number, production date, purchase date, inspection date, inspection number, inspection status, and responsible person; The stacking height limit ≤ 1.2 meters.
The disc steel bar yard requires the site to harden the ground and not accumulate water, and each type of steel bar is hung with eye-catching signs.
Disc steel bar raw material stacking identification plate requirements: clearly mark the manufacturer, model, specification, furnace (batch) number, production date, purchase date, inspection date, inspection number, inspection status, responsible person; The stacking height limit is: one roll high.
The steel bar centralized processing site hardens the ground and does not accumulate water, and the raw materials and semi-finished products are set up next to the centralized processing site, and the steel bars of different types or specifications are hung up eye-catching signs
Requirements for stacking signs of semi-finished steel products: clearly mark the stacking length, stacking width, stacking limit≤ 1.2 meters, model, and specification
The stacking of semi-finished steel products requires the site to harden the ground and not accumulate water, and the semi-finished steel products of different types and specifications are stacked separately, respectively, and the eye-catching signs are hung respectively, and the stacking height limit is ≤ 1.2 meters
The requirements for the stacking of semi-finished steel bars on the floor working surface are classified and stacked, and the stacking height limit is ≤ 1.2 meters
The site is cleared after the work is completed
7. Manage actions
Requirements for the management of the construction unit
1. The construction unit inspects the stacking of materials on a daily basis, and records the inspection situation with photos and text descriptions; The project department that does not meet the standard practices supervises the team to rectify immediately.
2. When the construction unit gives the bottom to each process team, it is clear that the special person of each process team is responsible for the completion of the site clearance, and sets up full-time management personnel for safety and civilization and finished product protection, and completes the site clearance work on the same day.
Supervision and management action requirements
1. After the vertical wall column reinforcement is tied, the supervision engineer can only seal the mold after 100% acceptance;
2. After the beam reinforcement binding is completed, the supervision engineer must carry out the intermediate process acceptance before the beam is sunk;
3. After the slab reinforcement binding is completed, the concrete pouring is allowed only after the supervision engineer is 100% accepted;
4. All stoppage points and witness points should retain image data (to reflect the overall construction situation) and written records during supervision and acceptance.
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