Double reinforced laminated plate reinforcement construction process?

This technology standard applies to multi-storey and high-rise civil buildings of various kinds of stacked floor or roof plate reinforcing steel binding. The conditions are suitable for industrial buildings can also be used.

2.1 Materials and main equipment:

2.1.1 Reinforcing steel: reinforcing steel level, diameter must meet the design requirements, should be free of old rust and oil. Reinforcing steel should have factory quality certificate and retest report.

2.1.2 Tying wire: No. 20-22 fire wire.

2.1.3 Matting block: made of cement paste 50mm × 50mm, thickness equal to the design thickness of the protective layer.

2.1.4 Main equipment: welding machine, rebar wrench, rebar hooks and so on.

2.2 Operating conditions:

2.2.1 The laminated plate has been lifted, the beam reinforcement has been tied, the laminated layer template has been installed, and the lapping tendons of the wall have been inspected and repaired in accordance with the requirements of the drawings and cleaned up of the rust skin and cement paste and other dirt. The above items have been done respectively hidden inspection or pre-inspection procedures.

2.2.2 Processing and molding of the laminated layer of reinforcement into the field, according to the design requirements to check its specifications, shape, size and number of the correct, and according to the construction plan of the designated location, according to the specifications, parts and number of the matting stacked separately.

3.1 Process:

Clean up the surface of the board and the board joints, and organize the tendons thrown out of the board → Tie the board joints tendons → Tie the two-way tendons of the ring → Tie the short tendons of the negative bending of the bearing → Quality inspection

3.2 Clean up the debris on the surface of the laminated board and the board joints, and organize the tendons thrown out of the laminated base plate according to the requirements of the drawings, see Fig. 4-25 (omitted).

3.3 Tie spliced plate seam 5 through-length bars. For φ5 cold-drawn low carbon steel wire flat welding molding of double steel bars, tied plate seam reinforcement level is divided into Ⅳ, according to the drawings design implementation, tied patchwork plate seam requirements see Figure 4-25.

3.4 Tying ring bidirectional tendons, along the two directions of the hanging ring are used through the length of the φ8 tendons bi-directionally connected to the neighboring span of 400mm, the end of the hook with 180 °. Directly intersecting with the ring through the ring, the other one is placed directly under the bar and tied with it, as shown in Figure 4-26 (omitted) (three splices as an example).

3.5 Tie the negative moment bar of the support, its protective layer is guaranteed to be not more than 20mm, and every buckle with the frame reinforcement are tied, the negative moment bar under the addition of reinforcing steel bench to ensure the correct spatial position of the negative moment bar.

4.1 Guarantee items:

4.1.1 The variety and quality of reinforcing steel must comply with the design requirements and relevant standards.

Inspection method: check the factory quality certificate and test report.

4.1.2 Cold-drawn low carbon steel bar mechanical properties must comply with the design requirements and construction specifications.

Inspection method: check the factory quality certificate, test report and cold drawing records.

4.1.3 The surface of the steel bar must be clean, with granular or flaky old rust, after removing the rust is still left with pockmarked steel, is strictly prohibited to use in accordance with the original specifications.

Inspection method: observation and inspection.

4.1.4 The specification, shape, size, quantity, anchorage length and joint setting of reinforcement steel must be in accordance with the design requirements and construction specifications.

Inspection method: observation or foot check.

4.2 Basic items:

4.2.1 The number of missing buckles and loose buckles is not more than 10% of the number of tied buckles, and should not be concentrated.

Inspection method: observation and hand wrenching inspection.

4.2.2 Reinforcing steel bending hooks in the right direction, tied joints, lap length in accordance with the requirements of the construction specification.

Inspection method: observation and foot check.

4.2.3 Angle of the hook and straight length in accordance with the provisions of the construction specification.

Inspection method: observation and foot check.

4.2.4 Spot welding joints without cracks and porous defects, welded joints at the molten metal uniformity, no burns.

Inspection method; check with a small hammer, magnifying glass.

4.3 Allowable deviation items, see Table 4-13 (omitted).

5.1 After the negative moment tendon of the support is tied, it is not allowed to step on it to work or walk on it, and send someone to watch and fix it to keep its correct spatial position.

5.2 When installing water and electricity pipes and lines, do not cut off and displace the tied reinforcement at will.

6.1 The space position of the negative moment of the support is not allowed, should strengthen the protection of the finished product and set the steel bench, appropriate amount of encryption. Negative moment bar spacing is uneven, the end is not in a straight line. It should strengthen the spacing marking division and the end of the line tying.

6.2 Hanger ring bidirectional through-length φ8 tendons, into the span length is insufficient, or one end of the long, one end of the short, the reinforcement should be correct, tying to remove obstacles, and conscientiously make the length into the span is in place, and the ends are even.

6.3 The laminated plate dumping tendon shaping is not standardized: the plate seam 5 through the long tendon is not straight, and the tying is not secure. It should be carefully shaped according to the regulations and adhere to a reasonable order of tying.

This process standard should have the following quality records:

7.1 Steel quality certificate or test report form.

7.2 Reinforcing steel (raw material, welding) test report.

7.3 Reinforcing steel hidden inspection records.

7.4 Reinforcing steel sub-project technical submission.

7.5 Steel sub-project quality inspection assessment.

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