Construction method for combined supporting of deep foundation pits under complex environments

Abstract

The invention discloses a construction method for combined supporting of deep foundation pits under complex environments, and relates to the technical field of building construction. The constructionmethod for combined supporting of the deep foundation pits under the complex environments is characterized by comprising the following steps: a waterproof curtain of a high pressure jet grouting pileis constructed through a two-tube method, and according to an adopted two-tube method high pressure jet grouting construction process, two media of high pressure cement paste and compressed air are conveyed to the design depth to be cut, stirred and replaced to form a cement soil impermeable wall to reinforce a foundation and stop water. According to the construction method for combined supportingof the deep foundation pits under the complex environments, rainfall around the foundation pits can be reduced and avoided, negative influences such as sedimentation and cracking caused by rainfall to surrounding buildings are prevented, meanwhile the occupied area of foundation pit excavation is small, excavation can be conducted without sloping, the I-shaped steel waterproof curtain is additionally inserted in the adopted high pressure jet grouting pile, the water stopping effect is achieved, the purpose of reinforcing slopes of the foundation pits is also achieved, at present, mature implementation processes and equipment exist, a technology is feasible, and economical and practical effects are achieved.

Description

technical field [0001] The invention relates to the technical field of building construction, in particular to a construction method for combined support of deep foundation pits in complex environments. Background technique [0002] With the development of economy and society, more and more super high-rise buildings stand in the center of the city, and the higher the superstructure, the deeper the depth of the lower foundation pit. In addition, when the surrounding environment is complex, the construction site is narrow, the groundwater level is high, When the foundation pit is deep, the construction of the construction project is more difficult. [0003] Traditional support often adopts tube well dewatering around the foundation pit, grading, anchor shotcrete and other schemes for construction operations. If you encounter a deep foundation pit project with high construction density in urban planning areas, complex surrounding environment, narrow construction site, and high ...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a construction method for deep foundation pit joint support in a complex environment, which solves the problem that traditional support often uses schemes such as tube well dewatering around the foundation pit, grading, anchor shotcrete, etc. to carry out construction operations. If you encounter deep foundation pit engineering support construction in the urban planning area with high construction density, complex surrounding environment, narrow construction site, and high groundwater level, it is difficult to meet the needs of vertical excavation of foundation pit slope and foundation and underground engineering. Due to the demand for construction, the safety and stability of the foundation pit slope is not good, and the construction cost and energy consumption are relatively high.

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