1 scope
This technology is applicable multi-storey and high-rise buildings laminated reinforcement of floor or roof. Conditions suitable for industrial construction we can use.
2 construction preparation
2.1 materials and equipment:
2.1.1 steel: steel grade, diameter must conform to the design requirements, should be free of old rust and grease. Steel quality certificate and retest report.
2.1.2 assembling wire: wire, 20~22.
2.1.3 pads: made of cement slurry 50mmx50mm, thickness of protective layer thickness.
2.1.4 main equipment: welding machines, steel wrench, steel hooks, and so on.
2.2 operating conditions:
2.2.1 laminated slab has finished lifting, steel has finished binding, laminated layer template has been installed, the walls out of the lap bar has been renovated are checked in drawings, mud, dirt and rust and water clean up. Above have been done hidden test or inspection procedures.
2.2.2 processing the laminated layer of steel comes into play, as designed to check the size, shapes, sizes and quantities are correct, and specify locations according to the construction plan, according to specifications, location and addition of wood piled up numbers.
3 operational processes
3.1 process:
Clean panels and seams, and finishing plate thrown out of reinforced → binding seams reinforced → tie rings, bi-directional reinforced →
Binding supports negative bending → short reinforcement quality inspection
3.2 removal of laminated panels and seams of debris, print finishing laminated floor out of the bars, as shown in Figure 4-25.
Figure 4-25
3.3 straps stitching seams 5 long bars. Φ 5 flat cold-drawn low-carbon steel wire for welding of bi-steel, binding seams reinforced levels range from grade IV, design implementation, requirements of binding plate joints as shown in Figure 4-25.
3.4 Lashing rings when two-way ribs, along the direction of two of the rings are made of full length φ 8 rib two-way connection, extending into the adjacent cross-400mm, plus 180 ° hooks of the end. Rings directly through the rings, has been placed directly under the bar and banding, Figure 4-26 (third spell, for example).
Figure 4-26
3.5 fastening bearing negative moment reinforcement, its cover ensure that no larger than 20mm, and stud each buckle lashing, adding bar stool under negative moment reinforcement, negative moment reinforcement to ensure correct position.
4 quality criteria
4.1 project:
4.1.1 steel variety and quality must comply with the design requirements and the provisions of the relevant standard.
Inspection method: quality inspection certificate and test report.
4.1.2 mechanical properties of cold-drawn low-carbon steel must comply with the design requirements and the provisions of the code.
Inspection method: quality inspection certificates, test reports and cold drawn record.
4.1.3 steel surfaces must be clean, with granular or flaky old rust, rust remains after pitting of steel, according to the original specifications is strictly prohibited.
Inspection method: Visual check.
4.1.4 reinforcement sizes, shapes, sizes, quantities, anchoring length and connector sets, you must meet the requirements of specification for design and construction.
Inspection method: observation or standard checks.
4.2 Basic project:
4.2.1 short buckle, tie loose quantity does not exceed 10% of buckle, and should not be set.
Inspection method: observation and hand checks.
4.2.2 rebar hook right, binding joints, lap length comply with construction requirements.
Inspection method: observation and standard checks.
4.2.3 hook angle and straight length in line with provisions of the code.
Inspection method: observation and standard checks.
4.2.4 welding solder joint cracks and porosity defects evenly, no burning of molten metal welding point.
Test method with a small hammer, a magnifying glass to check.
4.3 allowable deviation, as shown in table 4-13.
Table 4-13
Project tolerance (mm) test method
± 10 bar spacing of 1 standard at both ends, each point in the Middle, take the maximum value
2 fastening structural rib spacing ± 20 feet three in a row, taking the maximum value
3 welding structure span ± 10 ' three in a row, taking the maximum value
Center line 5
High levels of differential +3-0
Reinforcement of 5 ± 3 ' check
5 finished product protection
5.1 after a tie bearing a negative moment reinforcement, are not allowed to step on the job or walking on, and care and repair, maintain its correct position.
5.2 when installing utility lines, shall be arbitrarily cut off the tie and displacement of steel.
6 quality problems to be noticed
6.1 supports the negative moment spatial location, product protection and set the bar stool should be strengthened, and adequate encryption. Negative moment reinforcement spacing is uneven, end is not on the line. Division of spacing marks and end of the cable tie should be strengthened.
6.2 rings bi-directional flux φ 8 bars long, into the cross long enough, or end a long, end shorter, reinforcement to the right, binding to remove all obstacles and carefully make the span in place, both ends evenly.
6.3 laminated slab thrown out of reinforced plastic no specification: joints 5 long reinforcement is not straight, banding is not in prison. According to regulations should be carefully shaped, adhere to the proper binding order.
7 quality records
This standard shall meet the following quality records:
Steel quality certificate or test report 7.1.
7.2 bars (raw materials, welding) test reports.
Steel hidden 7.3 inspection records.
7.4 steel bar sub-item project technology gives the low-down.
7.5 steel quality inspection and assessment of the project.
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