Construction method for excavating foundation pit close to existing shallow foundation protection structure

Abstract

The invention relates to a construction method for excavating a foundation pit close to an existing shallow foundation protection structure. The construction method is characterized by comprising the steps that firstly, during construction, a foundation strengthening and reinforcing body and a lateral deformation soldier pile are arranged on the lower portion of an existing building foundation and the side, close to the foundation pit, of the outside of the foundation correspondingly; secondly, a cemented soil curing waterstop belt is arranged between the building foundation and the lateral deformation soldier pile, and a counter-force cross beam is arranged on the upper portion of the cemented soil curing waterstop belt; thirdly, a prestress oblique anchoring body is arranged on the lower portion of the foundation in a hit mode, and prestressing force is applied; and finally, soil bodies on the lower portion and the outer side portion of the building foundation are taken out, and then a vertical deformation adjustment structure and a transverse deformation adjustment structure are installed. In the excavation process of the foundation pit, the vertical deformation and transverse deformation of a building are controlled dynamically in real time; a gap around the building foundation is backfilled after excavation of the foundation pit is completed, and an anchor rod recovery section is recovered. According to the construction method, the construction technique is simple, deformation of the building foundation can be dynamically controlled in the vertical direction and the lateral direction, and the safety performance of the building foundation can be improved.

Description

technical field [0001] The invention relates to a construction method of a foundation pit excavation adjacent to an existing shallow foundation protection structure, in particular to a construction method capable of dynamically controlling the lateral and vertical deformation of a building foundation and improving the stability of an existing shallow foundation foundation, belonging to construction engineering field. Background technique [0002] The excavation process of the foundation pit is relatively complicated. The excavation process is often accompanied by engineering problems such as soil stress release, groundwater drainage, and settlement deformation around the foundation pit. These engineering problems may cause lateral deformation and vertical deformation of the buildings around the foundation pit. This will lead to the continuous deterioration of the safety state of the building, especially the impact on the safety state of shallow foundations. [0003] In actu...

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Problems solved by technology

Although these engineering measures can greatly improve the stability of the foundation pit and enhance the safety of adjacent buildings, but because these measures mainly focus on maintaining the stability of the side walls of the foundation pit, it is difficult to fundamentally solve the problem of existing adjacent buildings. Due to the lateral deformation and lateral deformation during the excavation of the foundation pit, it is impossible to realize the dynamic control of the deformation of the existing building

[0004] In terms of correction of existing buildings, there are clay correction methods, water immersion correction methods, precipitation correction methods, surcharged pressure correction methods, and anchor pile pressure correction methods. The foundation stiffness and the overall stiffness of the building are high, it is difficult to realize the dynamic control of the building correction, and the improvement of the bearing capacity of the foundation soil is not considered

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