Front-supporting and rear-pulling type foundation pit support system and construction method thereof

Abstract

The invention discloses a front-supporting and rear-pulling type foundation pit support system and a construction method thereof. The foundation pit support system comprises a support pile, a capping beam, a front-supporting type grouting steel pipe pile, and a rear-pulling type grouting steel pipe pile; the support pile is vertically constructed in a soil body to form a foundation pit support; the capping beam is arranged on the support pile; the front-supporting type grouting steel pipe pile is obliquely buried in the soil body in a foundation pit, the front-supporting type grouting steel pipe pile is anchored on the capping beam, and grout is injected into a pipe section, below the elevation of the bottom of the foundation pit, of the front-supporting type grouting steel pipe pile; and the rear-pulling type grouting steel pipe pile is obliquely buried in a soil body outside the foundation pit, the rear-pulling type grouting steel pipe pile is anchored on the capping beam, grout is injected into the whole rear-pulling type grouting steel pipe pile, and the rear-pulling type grouting steel pipe pile and the front-supporting type grouting steel pipe pile are alternately distributed. According to the system and the construction method thereof, the arrangement density of the front-supporting type grouting steel pipe piles in the length direction of the support pile can be reduced, the reliability, stability, safety and overall strength of the support system are improved, and the excavation difficulty of earth beside the foundation pit is reduced.

Description

technical field [0001] The invention relates to the technical field of construction engineering, in particular to a front support and back pull type foundation pit enclosure system and a construction method thereof. Background technique [0002] In the construction process in soft soil area, the enclosure structure of the foundation pit is cast-in-place piles and the bottom plate inclined support, which has the following problems. In order to set the bottom inclined support, a certain width of passive soil needs to be reserved beside the pit. It needs to be excavated after the bottom plate is erected and the prestress is applied. The passive soil reserved at the edge of the pit has limited resistance, and the soil rheological characteristics are obvious. If the construction period of the large-scale foundation pit is too long, the foundation pit enclosure will be deformed. . The surface subsidence data is too large, which is extremely unfavorable for the protection of surrou...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a front support and rear pull type foundation pit enclosure system and its construction method, so as to overcome the influence of the front support type grouted steel pipe pile enclosure system on the excavation efficiency at the pit side, resulting in the The problem of large deformation of the system

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