Prefabricated high-pressure airbag isolation pile structure with grouting function and construction method

Abstract

The invention relates to a prefabricated high-pressure airbag isolation pile structure with a grouting function and a construction method. The structure comprises a prefabricated high-pressure airbagpile body, an automatic adjusting system and a grouting system. The structure has the following beneficial effects: the prefabricated high-pressure airbag isolation pile is adopted to replace a traditional isolation pile; a high-pressure airbag is distributed in soil near the bottom of a foundation pit by a certain depth range, high-pressure gas is injected in the high-pressure airbag to form expansion pressure to change a peripheral stress field to cut off a stress transfer path, so that the horizontal traction effect of the rigid isolation pile is eliminated, and the displacement deformationgenerated by self deformation of the traditional isolation pile is made up; and the inflation expansion of the prefabricated high-pressure airbag is used for assisting the prefabricated pile to resist the deformation of the soil to realize real-time adjustment of the displacement of deep soil, so that the effect is better compared with the traditional isolation pile, the displacement deformationof the traditional isolation pile due to insufficient rigidity is made up, and the displacement of the deep soil on the outer side of an active area is reduced.

Description

technical field [0001] The invention relates to a structure and a construction method of a prefabricated high-pressure airbag isolation pile with a grouting function for protecting surrounding buildings during the excavation of a deep foundation pit, and belongs to the technical field of civil engineering construction. Background technique [0002] With the massive development of underground space and the shortage of urban land, there are more and more large-scale foundation pit projects, and the environmental conditions around foundation pits have become more and more complex, and a large number of large-scale foundation pits adjacent to structures have appeared. The impact of foundation pit excavation on the surrounding environment is not only reflected in the impact on the deformation of the surface outside the pit, but also in the overall displacement and deformation of the soil within a certain depth range below the surface outside the pit due to the unloading effect in ...

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Problems solved by technology

At the same time, there are many uncontrollable factors in the grouting reinforcement method. This method cannot accurately determine the direction of the grout in the soil and the corresponding reinforcement area. Only blind grouting can prevent the displacement of underground structures, but the effect is not ideal. , and even improper pressure control may increase the deformation of surrounding structures

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