A construction method of cast-in-place piles passing through karst caves

Abstract

The invention discloses a construction method of a cast-in-place pile penetrating through a solution cavity. The construction method of the cast-in-place pile penetrating through the solution cavity comprises the steps of firstly, carrying out drilling construction, and punching a pile hole required by the cast-in-place pile to penetrate through the solution cavity; after drilling the hole, arranging a liquid nitrogen reflowing device in the pile hole of a solution cavity area, arranging a liquid nitrogen supplying system on the ground, and connecting the liquid nitrogen supplying system withan access hole of the liquid nitrogen reflowing device through a pipeline; filling water into the solution cavity of the pile hole, starting the liquid nitrogen supplying system at the same time, exchanging heat through the liquid nitrogen reflowing device, and cooling water to form an ice layer; after forming the ice layer, cleaning the ice layer in the pile hole area, and forming a complete pilehole; and pouring a concrete, disassembling the liquid nitrogen supplying system, and accomplishing the casting of the cast-in-place pile. During drilling construction, a conventional method is adopted for constructing the pile hole in a non-karst area on an upper layer of the solution cavity; and a rotary drilling rig is adopted for constructing the pile hole in a karst area on the upper part ofthe solution cavity. The construction method of the cast-in-place pile penetrating through the solution cavity provided by the invention is convenient to operate, simple in structure, low in cost, free of damaging a surrounding environment, and convenient in site construction. Particularly, when being used for pouring the concrete, the construction method is not only material-saving but also environmental-friendly aiming at a solution cavity problem.

Description

technical field [0001] The invention belongs to the field of engineering pile construction, and relates to a construction method of cast-in-situ piles, in particular to a construction method of cast-in-situ piles passing through karst caves. Background technique [0002] As an unfavorable geological hazard, karst is ubiquitous in limestone areas. It is common to encounter karst problems in the construction of bored cast-in-place piles in the mountainous areas of Southwest my country. When the cast-in-place piles pass through karst caves, it will bring a lot of inconvenience to the construction. For karst caves, concrete and other waste residues are usually used for landfill during the construction of cast-in-place piles. These measures waste a lot of materials during construction, increase a lot of engineering costs, and cause damage to the surrounding environment. Therefore be necessary to design a kind of construction method that better handles through small and medium k...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a simple construction process, low cost, low carbon and ecological new construction method of bored piles passing through small and medium-sized karst caves in order to solve the problems of environmental pollution and material waste.

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