The Method of Reinforcement and Correction of Building Foundation by Combined Grouting

Abstract

The invention discloses a method for reinforcing and deviation correcting of building foundation through combined grouting. According to the method, polyurethane grouting and cement grouting are combined organically, polyurethane grouting drill holes are formed in the area where the maximal sedimentation occurs of the building foundation, the polyurethane reaction raw material slurry is grouted into the drill holes, the chemical reaction expansion is generated, so that the area where the maximal sedimentation occurs of the building foundation can be reinforced and lifted, meanwhile, cement grouting drill holes are formed in the periphery of the polyurethane grouting drill holes in a certain density, the pre-existing pores, pre-existing gaps and gaps generated after the polyurethane grouting foundation is lifted in the reinforced foundation are filled and reinforced through the cement grouting method, and a cement-reinforced body is formed. The method has the advantages the reinforcing and lifting of the building foundation through the polyurethane grouting are quick and precise; the building foundation is evenly and comprehensively reinforced through the cement grouting; the construction process is simple, convenient and fast, and the cost is low.

Description

technical field [0001] The invention relates to a treatment method for building foundations, in particular to a method for reinforcing and correcting building foundations by adopting joint grouting. Background technique [0002] For buildings and structures built on weak foundations, if effective foundation treatment measures are not considered or taken during the design or construction phase, large-area land subsidence will easily occur after completion. If the foundation soil is weak and uneven, excessive differential settlement will occur. Cracks are generated in the building structure, which endangers the safety of the structure. [0003] At present, there are many ways to strengthen the built buildings, but the following are commonly used: [0004] Grouting reinforcement is a foundation reinforcement technology for weak foundations, foundation cavity defects, foundation settlement, correction of buildings and building deflection. Some defects in the foundation cause t...

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Problems solved by technology

[0007] ① The viscosity of polyurethane reaction raw materials is high, and the radius of liquid reinforcement is limited, which is easy to cause unevenness of filling. The grouting points are relatively dense and uniform, and there are reinforcement blank areas between grouting points, and the foundation soil has large gaps;

[0008] ②According to previous engineering practice experience, due to the relatively dense polyurethane near the grouting point, the resulting polyurethane has a higher density, greater strength and stiffness, and a greater stiffness difference with the surrounding soil. Under the action of the upper load , resulting in secondary cracking of the foundation of the building near the grouting point;

[0009] ③High cost of polyurethane grouting

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