A construction method of anti-arching deformation bored pile

Abstract

The invention discloses a construction method of an anti-arching deformation bored pile, which can effectively eliminate the adverse friction resistance effect of the bored pile in an arching deformation zone, thereby saving engineering investment. The method includes the following steps: positioning the construction plane of the bored pile on the foundation; constructing the pile hole of the bored pile, using mud to protect the wall until the construction design elevation; making an outer protection pipe matching the pile diameter of the bored pile, with a length equal to The depth from the ground to the boundary line of the upper arch deformation zone; cover and fix the composite geomembrane on the inner wall of the outer protection pipe; press the outer protection pipe lined with the composite geomembrane into the pile hole of the bored pile, and the nozzle is flush with the ground; Put the reinforcement cage of the bored pile into the pile hole through the outer protection pipe; put the concrete injection pipe into the bottom of the pile hole, inject concrete from the bottom of the hole, and slowly lift the concrete injection pipe until the design pile top elevation.

Description

technical field [0001] The invention relates to geotechnical engineering, in particular to a construction method of an anti-arching deformation bored pile. Background technique [0002] When the ballastless track high-speed railway passes through the expansive rock foundation in the form of cutting, the deep excavation of the soft rock foundation and the seasonal frozen soil area, the following technical problems will occur: under the action of water, the expansive rock foundation will produce a large The upward expansion force; deep excavation of the soft rock under the action of a large unloading, the rock body will produce upward creep or rheological deformation, and the duration is very long; within the scope of the freezing depth in seasonal frozen soil areas The rock and soil undergoes cyclic frost heaving deformation. In order to ensure the operation safety of the high-speed railway, it is necessary to set up an anti-arching deformation structure. There is an arching...

AI Technical Summary

Problems solved by technology

[0002] When the ballastless track high-speed railway passes through the expansive rock foundation in the form of cutting, the deep excavation of the soft rock foundation and the seasonal frozen soil area, the following technical problems will occur: under the action of water, the expansive rock foundation will produce a large The upward expansion force; deep excavation of the soft rock under the action of a large unloading, the rock body will produce upward creep or rheological deformation, and the duration is very long; within the scope of the freezing depth in seasonal frozen soil areas The rock and soil undergoes cyclic frost heaving deformation. In order to ensure the operation safety of the high-speed railway, it is necessary to set up an anti-arching deformation structure. There is an arching deformation zone in the rock and soil, and the frictional resistance of the rock and soil mass to the pile in this affected area is upward, which is an unfavorable force. Only the frictional resistance in the non-arching deformation zone is beneficial, and the traditional bored pile construction cannot To solve the above-mentioned problems, a construction method for anti-arching bored piles is proposed, which should have the characteristics of eliminating the adverse friction effect of the arching deformation zone, convenient construction, good economy, environmental protection and promotion.

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