Self-supporting construction method for multilayer underground structure next to existing building

Abstract

The invention relates to a self-supporting construction method for a multilayer underground structure next to an existing building. When the distance between a proposed underground building and the existing building is within 15 meters, the construction method is adopted, and the method specifically comprises the following operation steps: 1, supporting pile construction; 2, developing and controlling an earthwork of a negative first layer; 3, controlling holes at a frame column position and setting a retaining wall; 4, carrying out the construction of frame columns of a negative second layer; 5, carrying out the construction of top beams and plates of the negative second layer and columns, beams and plates of the negative first layer; 6, mounting horizontal steel supports; 7, developing and digging the earthwork of the negative second layer; and 8, carrying out the construction of other structures of bottom plates, walls and the like of the negative second layer according to a conventional method. The method skillfully uses the rigidity of an underground engineering structure self to provide a supporting point for the supporting pile so that the supporting pile is changed into a three-span indeterminate member from a cantilever member, so the bending moment load effect of the supporting pile is greatly reduced, then the designed pile length and section area of the supporting pile can be greatly reduced, the construction cost is saved by about over 35 percent, and the integral construction progress of the underground structural engineering is accelerated.

Description

technical field [0001] The invention relates to a construction method for a deep foundation pit of a multi-layer underground structure adjacent to an existing building. Background technique [0002] The reform and opening up has brought about a climax of urban construction, urban land resources are increasingly scarce, and urban construction gradually extends to the sky and underground. In urban construction where every inch of land is expensive, the development and utilization of underground space has become a major development trend. For this reason, excavation of underground structures next to existing buildings is becoming more and more frequent. How to ensure the safety and stability of the existing buildings adjacent to the construction process has become an important and difficult point in the construction process. [0003] The current construction process of the prior art: first, support is carried out around the deep foundation pit to be excavated, then the founda...

AI Technical Summary

Problems solved by technology

[0022] In order to solve the problems of safety, quality, environment and cost in the construction of deep foundation pits adjacent to existing buildings, the present invention provides a deep foundation pit construction method that uses the underground structure body to provide internal support adjacent to existing buildings

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