The garage has only 1 floor, and the foundation is sunken, and cracks in the walls are remedied

It is not ruled out that it is a problem with the soil. The cracks in the corners of the windows on the ground floor are mostly caused by the uneven settlement of the foundation, but it is normal for new buildings to produce settlement, only the settlement is not too large, and the expansion of wall cracks is not more and more serious, nor is it a big problem. In addition, the influence of temperature and shrinkage of materials may also cause cracks in the wall.

Any ground floor such as 1 storey and 6 floors, and multi-storey buildings will have the phenomenon of foundation sinking. Because the foundation and the ground have a load of heavy objects acceptance process (specific professional language, I can't remember), as long as it is uniform sinking is very normal range, if the diagonal, or one side and the other side are not equal to the sinking, it means that there is a problem with the construction, and there are other problems. There will be crooked buildings, cracked buildings, kneeling and other well-known real estate accidents last year.

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1) For the general fine cracks that are not large in settlement difference and have not been developed, because it will not affect the safety and use of the structure, it is enough to wipe with mortar.

2) For the situation that the uneven settlement is still developing, the cracks are serious and continue to be carried out, it should be carried out in line with the principle of reinforcing the foundation first and then treating the cracks. Generally, the pile foundation underpinning reinforcement method can be used to reinforce, that is, the cast-in-place piles are arranged along both sides of the foundation, and the lifting beam is set up on the original foundation ring beam to prevent the foundation from continuing to sink.

Then, according to the severity of the cracks in the wall, the grouting filling method (1:2 cement mortar) was used respectively. Reinforcement mesh reinforcement method (250mm 250mm 4-6 reinforcement mesh, fixed on both sides of the wall with through-wall reinforcement, plastered with 35mm thick M10 cement mortar or C20 fine stone concrete); Demolition and rebuilding (removing part of the brick wall and rebuilding it with a mortar higher than the original strength grade).

A ring of cracks in the wall of the underground garageCauses and solutions:

1. GroundA ring of cracks in the wall of the lower garageIt is mainly caused by excessive tightening and bonding and the control of the curing process of the concrete mixture. Large, thin shapes lead to large shrinkage, and thin, narrow rebar is dense, forcing large slumps and concrete mixtures.

2. Improper maintenance or lack of attention, excessive fly ash does not meet the standard, There is a thorough analysis of the cause of the crack, and the technology is not perfect, so the cracks in the basement wall are somewhat common.

A ring of cracks in the wall of the underground garageIt is caused by the shrinkage of the concrete itself, and the cracks will also become uneven, and the cracks are mainly caused by the action of temperature, mainly in the yin and yang areas affected by temperature. The more concentrated sections, especially the steps that significantly change the temperature, become more and more apparent.

4. Carefully observe the cracks that have occurred, and do not deal with them immediately. If the crack no longer occurs, various stresses are released. The surface of the crack can be lightly cut and inspected with a magnifying glass.

If a crack occurs only in the protective layer (and not through a crack), then the quality can be treated according to the general principle of the problem and the necessary treatment. However, if the crack extends through the protective layer, quality verification is required. If severe, a specific plan should be developed at the end of the test report and reviewed and approved by a supervisory body after the design review is passed, before the specific design is completed.

A ring of cracks in the wall of the underground garageAppropriately select the proportion of cement mortar for exterior wall plastering, generally 1: mortar, do not use 1:1 or 1:

2. Cement mortar. If the amount of cement is too large, the mortar has a large shrinkage and is prone to cracking. In order to facilitate construction, or the mortar can be added to the corresponding fly ash, or the adhesive mortar cracks, the consistency of the gypsum mortar is increased to improve the adhesion of the wall and can prevent air pocketing.

6. The doped structure of adhesive fiber cement mortar improves the crack property of the effective mortar layer, which can improve ductility, crack resistance and enhancement, and the increased cost is not large. According to strict rules and external stucco construction methods, dust, dirt, grease and brick walls, etc., should be carefully removed from the surface of the base layer.

A ring of cracks in the wall of the underground garageThe connection of bricks and concrete beamsA simple method of cracking is to prevent cracks from occurring, and the mortar in the cracks is reinforced through the reinforcement mesh. In order to prevent scratching of the re-slurry mixing elements using cement, cracks, in order to increase the bonding capacity of the mortar. Prevent cracks in underground wall panels

In order to reduce the shrinkage stress of concrete, it is treated according to the design requirements.

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