Construction method of a double-pipe inclined support deep foundation pit

Abstract

The invention relates to the technical field of deep foundation pit support construction methods, the invention discloses a construction method of a double-pipe inclined support deep foundation pit. The two long steel pipes are arranged side by side, the method comprises the following steps of 1, reserving counter-pressure soil on the foundation pit; 2, marking the mounting position of the long steel pipe; 3, arranging a lattice column, wherein the lattice column is provided with a fixing structure; 4, a waist beam part is arranged at the upper end part of the supporting pile, a support is arranged at the bottom of the foundation pit; 5, the plurality of sections of steel pipes are in butt joint to form a long steel pipe, according to requirements, the long steel pipes are connected witha plurality of sections of connecting pipes, and the connecting pipes are fixed on the waist beam parts; 6, prestress is applied for multiple times, after the prestress is applied in place, the movable end is fixed; 7, the construction and acceptance are carried out, and the counter-pressure soil is excavated to reach the designed elevation. Under the action of the lattice columns, the partial length-to-thin ratio of the long steel pipes is reduced, and the arrangement stability of the long steel pipes is improved, the two long steel pipe combinations and the lattice column are matched for supporting the foundation pit, the supporting stability of the deep foundation pit is enhanced, and the support of the deep foundation pit is guaranteed.

Description

technical field [0001] The invention relates to the technical field of construction methods for supporting deep foundation pits, in particular to a construction method for supporting deep foundation pits with double-pipe oblique braces. Background technique [0002] Deep foundation pit support often adopts various foundation pit support forms according to the surrounding environmental conditions and use requirements of the site, so as to meet the safety and economic requirements of the foundation pit. [0003] At present, the oblique cast support system has the characteristics of flexible layout and convenient earthwork excavation. When the soil pressure around the foundation pit is inconsistent and cannot be supported by horizontal supports, the oblique cast support can be used as a support form; or deep foundation pits If the displacement, settlement and other deformations exceed the standard, it is an efficient and convenient treatment method to adopt diagonal throwing re...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a construction method for supporting deep foundation pits with double-tube diagonal braces, aiming at solving the problem of inconsistencies in the earth pressure around the deep foundation pits in the prior art, or when the deformation of the deep foundation pits exceeds the standard. The problem of poor stability

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