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Problems encountered in the construction of aluminum formwork and their solutions
Feb 01, 2019


1. Due to the irregular installation of the starting board, the position of the starting board of the outer wall is not flat, which causes the horizontal elevation to be uncontrollable, the overall unevenness, and the wall panel to be displaced.

2. The vertical steel bars are biased, resulting in the wall panels not being assembled or the template mounting axis offset.

3. The positioning ribs were not welded as required. After the wall panels were installed, they were not measured and corrected in time. The verticality of the wall was not enough and uneven, which affected the surface quality and decoration quality of the main structure.

4. The wall positioning steel is drilled, which causes the pipeline in the floor to be damaged, which seriously affects the installation of the pipeline in the later stage.

5. The wall formwork and the ground gap are large, the concrete is not vibrated in place, the root of the wall is leaking, honeycomb, pockmark, and bubble holes.

6. The wall support strip is longer than the width of the wall, and some of the wall support strips are inclined, which does not function well to control the protective layer of the steel and the cross-sectional dimensions of the wall.

7. The wall bracing is not set according to the requirements. The verticality of the wall formwork installation is not adjusted in time when it does not meet the requirements.

8. The pin, the pin missing or the pin, the pin is not installed as required, resulting in the template reinforcement not in place, the inspection and inspection is too formal, and the mold is not tight when the concrete is poured, and the expansion of the mold occurs in some places, causing the surface of the wall to be uneven.

9. The PVC sleeve of the pull screw is not installed in place, and the wall can not be pulled out by the pull screw, which affects the recycling of the material and needs to be cut at a later stage.

10. The concrete level elevation has not been reviewed, the flatness of the floor is deviated, and the floor elevation has gradually increased, which has an impact on the project acceptance.

11. The wrong layer balcony area is improperly erected, and the support rods are directly erected on the outer frame. The safety construction is not guaranteed, which may lead to deformation of the outer frame and structural instability.


Countermeasures:

1. The installation personnel are required to install in strict accordance with the requirements. The starting board installation must be fixed with the starting board screws.

2. It is necessary to pre-seat the wall of the building in advance, and adjust some of the partial rebars in time according to the requirements after stakeout.

3. Start (about 20cm off the ground) welding positioning steel bars, the spacing is not more than 60cm. The cement positioning strip (support strip) is placed on the upper part; the oblique support is adjusted to the exact position; the vertical deviation of the wall panel is adjusted to be adjusted by the manual hoist.

4. Positioning steel bars must be in the form of pre-buried or welded, and it is strictly forbidden to use after hitting.

5. The root of the wall is made of mortar to make the angled caulking and caulking to avoid leakage; when the concrete is poured, the vibrating rod vibrates in place, and the wall should be layered.

6. Install the wall width to add the corresponding wall support strip; adjust the wall aluminum mold installation to ensure that the steel protective layer and width meet the requirements of the specification;

7. It is necessary to add wall bracing according to the requirements, especially the outer wall; if the vertical deviation of the template installation is large, the iron hoist can be used for correction.

8. Clean up the scattered pins on the site; check the formwork before pouring: the general wall ends (corners) must be fully filled, with a spacing of 300mm, the length of the beam is 1.2m long and at least 3, and the short beams and plates are 1.2m long. At least 2; send a special person to see the mold when pouring, and take reinforcement measures in case of problems.

9. Before sealing the wall body, strengthen the inspection of the pull screw bushing, replace the unqualified bushing, and cut the screw in time.


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