Closed enclosure system comprising supporting piles with specially-shaped sections and construction method thereof

Abstract

The invention discloses a closed enclosure system comprising supporting piles with specially-shaped sections and a construction method thereof. According to the system, a water-soil pressure is born by cast-in-place piles with cross-shaped or T-shaped sections, a space among the supporting piles with the cross-shaped or T-shaped sections is closed by cement-soil piles, and bearing and water stopping are integrated; the cast-in-place piles with the cross-shaped or T-shaped sections and high flexural rigidities are used as the supporting piles, and compared with the traditional supporting piles with circular sections, the overall rigidity of a supporting system can be remarkably increased, the displacement of a foundation pit can be reduced, and the engineering cost can be decreased; the space among the supporting piles is closed by the cement-soil piles, and a closed water-stopping curtain does not need to be additionally arranged, so that the engineering cost can be remarkably decreased; in the enclosure system, the piles with the cross-shaped sections or the piles with the T-shaped sections are engaged with the cement-soil piles at flanges, and compared with the engagement between the existing cast-in-place piles with circular sections and cement-soil piles, each lap-joint part has a long rounded flowing path and a good water-stopping effect; and the enclosure system disclosed by the invention is capable of obtaining a supporting effect which is similar to the supporting effect of an underground diaphragm wall enclosure structure, and low in construction difficulty and engineering cost.

Description

technical field [0001] The invention relates to a closed foundation pit enclosure system and a construction method thereof, in particular to a special-shaped cross-section support pile enclosure system with relatively high bending rigidity and a construction method thereof. Background technique [0002] The current deep foundation pit engineering is mostly based on deformation control. The section bending stiffness and bearing capacity of the envelope structure are important factors that restrict the support performance of the support structure system, and are also important factors that affect the project cost. Increasing the bending stiffness of the enclosure structure can reduce the deformation of the support system, which is beneficial to the environmental protection around the foundation pit. Under the condition of the overall rigidity requirements of the specific support system, the increase of the bending stiffness of the enclosure structure is to reduce the support an...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a closed enclosure system of special-shaped cross-section support piles and its construction method. waste and other technical problems, and also solved the defects of high cost of closed water-stop curtain engineering

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