Construction method for reconstructing anti-floating layer from waterproof bottom plate of existing building

Abstract

The invention relates to the technical field of anti-floating reconstruction design and construction of waterproof bottom plates of existing buildings, in particular to a reconstructed anti-floating layer of a waterproof bottom plate of an existing building and a construction method of the reconstructed anti-floating layer. The method comprises the following steps: calculating the thickness of a reconstructed anti-floating layer; an anti-floating layer grouting pressure balance system is arranged; constructing a waterproof bottom plate reconstructed anti-floating layer; and recovering the basement ground. According to the method, the key technical problem that the existing building waterproof bottom plate bulges, cracks, leaks and the like which are difficult to cure due to the fact that underground water exceeds the anti-floating protection water level or the rain period water level is solved, the construction operation is simple and easy to implement, and the transformation cost is only 1 / 10 of the reworking and repairing cost. The method is suitable for anti-floating failure transformation design and construction of existing building basement waterproof bottom plates without underground water level fortification and with underground water level fortification.

Description

technical field [0001] The invention provides a construction method for rebuilding an anti-floating layer of an existing building waterproof floor, which belongs to the technical field of anti-floating renovation design and construction of an existing building waterproof floor, and is suitable for the anti-floating basement of existing buildings without groundwater level fortification and with groundwater level fortification. Reconstruction design and construction of floating failure. Background technique [0002] According to the statistics of geological exploration data in recent years, the groundwater level has risen by 2m to 3m, resulting in about 80% of the existing buildings with no groundwater level fortification and about 15% of the existing buildings with groundwater level fortification. Functional and structural durability has become a national key technical problem that is difficult to cure. [0003] Chinese patent CN104863188A discloses a self-pressured anti-flo...

AI Technical Summary

Problems solved by technology

[0002] According to the statistics of geological survey data in recent years, the groundwater level has risen by 2m~3m, resulting in about 80% of the existing buildings without groundwater level fortification and about 15% of the existing buildings with groundwater level fortification. Functional and structural durability has become an intractable national key technical problem

[0003] Chinese patent CN104863188A discloses a self-pressurized anti-floating construction method, which is only applicable to new construction, such as figure 1 As shown, there is only a schematic diagram of drilling, intubation, and rotary jet grouting around the foundation to form a vertical water barrier, but there is no schematic diagram of densely distributed drilling, intubation, and rotary jet grouting in the foundation pit, which cannot be used by grouting. The foundation soil forms the monolithic floor

[0004] If the foundation pit is densely covered with drilling, intubation and rotary jet grouting to form a 250mm thick cement-soil integral floor, it will not be able to meet the minimum anti-seepage thickness requirement of the anti-floating concrete floor thickness of not less than 350mm in the "Technical Standards for Anti-floating of Construction Engineering"

Therefore, the groundwater pressure can easily break through the weak bottom cement-soil water barrier and penetrate under the foundation to generate buoyancy, so the soil under the foundation cannot play the anti-floating function

Images