Installation technology of prestressed solid whole floor

Prestressed solid whole floor installation

1 scope

This technology is applicable to multi-layer and high-rise brick internal and external structures such as internal model of prestressed solid whole floor installation process.

2 construction preparation

2.1 materials and equipment:

2.1.1 building Board: no cracks, warping, and other defects. Widget factory certificate.

2.1.2 cement: numbered No. 425, Portland cement and ordinary Portland cement and slag Portland cement. The factory certificate. According to the provisions of the second interview.

2.1.3 sand: sand.

2.1.4 main tools: steel Board, crowbar, casing, pipe supports, 100mmx100mm wood and so on.

2.2 operating conditions.

2.2.1 according to the construction plan requires piling yard repair flat solid, first Board below the long wood, each plate pad short mat wood. When building slab width ≤ 3170mm, the wood length 400mm, width 3770mm, wood 500mm. Wood thickness ≥ 50mm, wood placed parallel long sides. As shown in Figure 4-41. Wood to align, pad gasket shall not be void in a corner. Duo piled up, each up to 9 blocks. Stacked on the floor during transportation in the car should also be the same.

Figure 4-41

2.2.2 checking floor whether it is a factory certificate. And then check the appearance quality of slab, who do not meet the quality

Requirements shall be used, such as building plate or raised key cracked or damaged, shall be used.

2.2.3 check wall axis and elevation control lifting figure check large floor models and specifications. Ascertain the hole on the plate with the drawings of the building are the same.

2.2.4 repair in-situ concrete wall height, wall height should be less than the elevation at the end of 10~20mm, such as when a low concrete wall height, you should fill concrete leveling; plus high slab of concrete wall elevation should tick, and to ensure that the upper surface of the floor levels to meet the requirements. Excessive axial-inclination of wall, should be adjusted to ensure that the Board take the wall length to meet the requirements of the building.

3 operational processes

3.1 process:

Mortar screed or hoisting large slabs of hard frame formwork → → adjust → finishing binding reinforcement

3.2 mortar screed or rigid frame formwork: before installing the floor, according to the elevation at the top of wall concrete screed, screed mortar mix for 1:3. When using rigid frame formwork, concrete wall elevation should pound drop 1~2cm.

3.3 the hoisting building Board: find out first before lifting floor entrance location (including heating and plumbing, gas, electrical line opening) and floor direction sign control design drawings to identify each room with large floor models are correct. Installation plate-side against the wall while slowly reducing, fell again after the hook.

3.4 adjust position: adjust plate edges lap length of the building to comply with the design requirements and of two adjacent plates 6 φ 12 tie bar welded to each other, should weld length ≥ 90mm, shall conform to the specification for welding of welding quality requirements.

3.5 organize lashing bars: out of the four weeks of the prestressing steel bent into a circular shape and spread them on the slab, beam or wall, not straight bending hard turn, as shown in Figure 4-42.

Internal wall thickness

D1 internal longitudinal wall thickness

D2 on the wall

A vertical wall

B on the Gables

c

Multilayer 140 160 5 10 15

The top 160 160 15 10 15

Figure 4-42

4 quality criteria

4.1 project:

4.1.1 concrete strength when lifting components must comply with the design requirements and the provisions of the code. Check the widget factory certificate.

4.1.2 floor joints of concrete mix must be accurate, pouring dense, careful conservation, which must meet the design requirements or provisions of the code. Experimental report on inspection of concrete blocks.

4.1.3 floor models, location, point anchoring must comply with the design requirements and no damage. Check the lifting records.

4.2 Basic project:

4.2.1 floor elevation, paste code for design and construction requirements.

4.2.2 shall ensure that two adjacent plates welded lap length, surface should be smooth and weld no dents, no crack, blowhole, slag, welding tumor and undercut.

4.3 allowable deviation, as shown in table 4-38.

5 finished product protection

5.1 Installing the building Board, cast walls concrete strength reached more than 4MPa installation.

Floor installation tolerances in table 4-38

Project tolerance (mm) test method

Axis offset 5-foot check

High level or standard for ± 10 check

Floor shelving ± 10 feet in length check

Surface height difference on the same axis of adjacent 5-foot check

5.2 shall not be arbitrarily picking holes in the floor.

5.3 lifting floor shall be arbitrarily hit touch in-situ walls.

6 quality problems to be noticed

6.1 failed building plates on the wall: the appearance detailed inspection before installation.

6.2 floor installation direction signs and drawings do not conform to the following: due to large slabs of sign drawing requirements are not met, causing holes and drawings do not comply with, feel free to pick your cut damaged floors. Should be checked carefully before installation.

6.3 Board ends frame a wall long enough: hoisting without alignment line the walls, or no serious adjustments, resulting in side frame a wall too little.

6.4 Installing the floor plate end out of steel are not allowed to shut off should not scrape off the keyways nor the bar out on the adjacent Panel below.

6.5 installation when building using rigid frame formwork or screed, its elevation, the design requirements, support shall have sufficient rigidity, promise not to sink.

7 quality records

This standard shall meet the following quality records;

7.1 component factory certificate.

7.2 steel quality certificate or test report.

7.3 steel mechanics performance test report.

7.4 wall concrete, slab concrete testing reports.

7.5 prefabricated lifting records.

7.6 components install section for quality inspection and assessment records.

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