Method for waterproof leakage of building exterior wall

In recent years, due to the implementation of wall reforms and the wide-scale promotion and application of new wall waterproof sealing materials (such as concrete hollow blocks, hollow clay bricks, ceramsite or slag hollow blocks, aerated concrete blocks, etc.) The leakage rate of the exterior wall of the building is on the rise. In particular, every time during the rainy season or typhoon season, the leakage of water from the exterior wall of the building is particularly serious, which seriously affects the decorative effect, durability and function of the building. According to the actual situation of leakage of water on the external wall surface, timely research and development and application of polymer cement mortar or polymer cement composite waterproof plugging coating with integrated functions such as bonding, waterproof plugging and crack resistance The new waterproof material is combined to waterproof the external wall surface. At the same time, effective waterproofing measures should be taken for the masonry and construction of the external wall, and the joint between the external wall and the window frame should be reserved. The elastoplastic sealing material is tightly closed, so that the outer wall surface is well waterproofed. The following is my own experience in construction management for many years, focusing on measures to prevent leakage of external walls of buildings:

First, ensure the construction quality of the screed

1. Work before leveling the plaster:

Attention should be paid to the wetting of the front surface of the masonry batch, the spraying water is sufficient, and the outer wall surface of the intersection of the masonry part and the concrete part should be covered with a 200 mm wide 16# steel mesh before the plastering and fixed to resist the difference. Cracking caused by different expansion coefficients of the waterproof plugging material. For the floating wall of the concrete wall, residual template wood chips, the exposed steel bars and iron wires must be cleaned to ensure that the plaster mortar is firmly bonded to the base layer.

2, should pay attention to leveling plaster: (1) mortar should be strictly in accordance with the ratio, strict measurement, control of water-cement ratio, it is strictly prohibited to mix water during construction; (2) plastering mortar should be layered plaster, especially high-rise buildings, Partial exterior wall plastering is thicker, which requires layered batch ash. The thickness of each layer of plaster should not exceed 2cm. If the thickness is too large, a steel mesh should be provided at the layering; (3) the batch of mortar can be waterproofed with polymer. Mortar; (4) External wall plastering scaffolding pull ribs, etc., should be cut, the bell mouth is smeared and flattened, after the slurry is fixed, it can be cut into ruthenium with iron trowel, and then brush a plain cement slurry.

Second, wall inspection and treatment

1. Inspection and treatment of wall holes: Before the ash is to be inspected, the wall holes should be inspected, and various holes such as the wall body should be sealed. The unevenness should be leveled with 1:3 cement mortar. If it is too thick, it should be layered and leveled. Or hang the steel mesh, bonding cloth and other batch ash, and the hole left in the outer wall of the scaffolding, tower crane, construction elevator, etc. should be clean and moist, use the cement slurry to sweep the slurry fully, and then use the dry hard 砼 2 The second half is blocked, first inside and then outside, fully tamping and compacting, the water drop pipe clamp is inclined downward by 3°-5°, the expansion sleeve of the expansion sleeve is brushed with epoxy resin, and the wooden wedge is strictly prohibited. The screw hole on the wall of the waterproof plugging concrete shearing wall should be chiseled into a bell mouth, filled with expanded cement mortar, and then sealed with polymer waterproof slurry to seal tightly. 3. A small amount of rising mold and honeycomb surface phenomenon appeared on the outer wall of the external wall. The following methods were used to repair the surface of the concrete: 1 Remove and clean, then wash the base with a wire brush or pressurized water, then level with 1:2 or 1:2.5 cement mortar, and finally sprinkle water for 14 days. 2 Honeycomb repair (all found honeycomb hemp surface area is small and no deep hole phenomenon), first of all, the water-proof plugging loose stone and swarf on the surface of the shovel is cut and cleaned. Secondly, before repairing, the water on the surface to be repaired should be washed with water to keep the base of the repaired surface moist, and then leveled with water mortar of 1:2 or 1:2.5, and finally watered for 14 days.

2. External wall masonry requirements: avoid wall weight joints and light transmission during masonry, mortar mortar joints should be uniform, wall and beam-column interface should be cleaned and cleaned, and brick masonry should be wet, masonry wall Do not reach the top once, should be completed in two or three times to prevent the mortar from shrinking, so that the wall is fully solid, and pay attention to the flatness detection of the wall to prevent the water from being too thick or too thin.  

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