Common problems and construction measures of reserved hole in wall?

Due to the requirements of vertical transportation, horizontal transportation, feeding, inter-unit transportation and heavy equipment installation, it is generally necessary to set reserved holes in the wall during construction, such as feeding holes, crossing points and equipment installation holes. It will not be sealed one by one until the later stage of construction. Today, let's take a look at the common problems and correct construction measures of the reserved hole in the wall!

Frequently asked questions (1): The masonry wall is not braced, and the reserved hole is not provided with lintels, which causes the brick wall to be skewed, and the masonry brick joints on the hole are of different sizes, and the horizontal mortar joint is a dragon. (2) If the construction channel between residential units is in the deformation joint, there is no shelter, and a large amount of construction waste falls, which may reduce the deformation function of the deformation joint. (3) If the floor slab is a prefabricated hollow floor slab, because the hopper car pours concrete, the feed inlet is easy to bear concentrated load, which leads to the cracking of the hollow floor slab. (4) The reserved hole is in the late stage of construction when plugging, and the workload of plugging and plastering is small, so it is often anxious for success. For example, the mortar joint is not clean, the mortar joint is not sealed, and the decorative layer is applied too thick at one time. The hole part is easy to leak, empty drum and crack in the future. (5) The reserved hole decoration project is in the later stage of the large-scale decoration project of the house. If the same batch of original decorative materials is not left enough, it is easy to have obvious color difference and reduce the quality impression. (6) The sealing and plastering of the reserved holes will be carried out in the later stage of construction, and the drying shrinkage of the plastering surface will take quite a while. If the painting project is in a hurry, the coating is easy to bubble, crack and change color. (7) The area where bamboo scaffolding is used is still reserved. In the later stage of construction, if the external scaffold is only removed from the entrance, the Rachel between the entrance scaffold and the wall will be removed due to the renovation project, and the entrance scaffold will become an isolated high-risk structure; In addition, bamboo and wood may have decayed in the later stage of construction, and residual deposits such as lime sand have not been removed, and too many piles have been piled up during frame sealing, leading to instability and collapse accidents.

Correct construction measures

0 1 The reserved hole is provided with lintels, the brick wall is laid with stay wires, and Rachel steel bars with a diameter of 6 are arranged every 500mm along the wall height.

If the reserved hole is at the deformation joint, it should be shielded to prevent the construction waste from falling.

When the entrance is a prefabricated hollow floor slab, a top brace should be set under it, and the top brace should be from the first floor to the top floor.

When plugging reserved holes, don't rush for success, which can't reduce the quality requirements of masonry and plastering. If the joints are connected, more attention should be paid to the tightness of grouting, and layered plastering should be adhered to, leaving no gaps, cracks, leakage and other hidden dangers.

05 The reserved holes should be decorated with the original batch of decorative materials (enough) in advance to avoid repairing the color difference.

06 For the reserved hole facing project, anti-crack fibers should be added to the leveling layer and the mortar for the cover, and the intermittent and curing time of the plastering base should not be less than 14 ~ 2 1d (the time should be extended in wet and low temperature seasons or in southern areas). Only the primary quality assurance of the previous process can ensure the painting quality of the subsequent projects.

07 Decoration construction shall not dismantle Rachel of external wall and scaffold without permission. No matter what kind of material is used, the scaffolding at the entrance should be prevented from collapsing in the later stage of construction. Remarks: This content comes from Zhu Long Supervision.

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