Construction process of dry-work hole cast-in-place pile penetrating through karst cave

Abstract

The invention discloses a construction process of a dry-work hole cast-in-place pile penetrating through a karst cave. First, a dry-work method bored cast-in-place pile construction process is used toform a hole in an overbarden layer of the karst cave; then a filling body is prepared, and the filling body includes an inner core and an outer shell wrapping around the inner core; afterwards, the filler body is placed inside the karst cave in a compression state, and rebounded and unfolded in the karst cave; afterwards, a grouting guide pipe is used to pour cement slurry into the inner core ofthe filler body, and the cement slurry permeates into the inner core through a porous structure; after the cement slurry in the inner core of the filling body is solidified, excavating is carried outfrom the top of the filling body by using the bored cast-in-place pile construction process, after the filling body is penetrated, and forming hole in the lower part continues to be carried out untilthe drilling depth reaches the design depth of a pile body, drilling is stopped; and afterwards, a reinforcement cage of the pile body is lowered, concrete pouring of the pile body is carried out, andthe pile foundation construction is completed. The construction process adopts a brand-new method to solve the problem of slurry leakage in the construction of the cast-in-situ pile in a karst cave area, the construction is easy and the cost is low, and the construction process has a large value of popularization and application.

Description

technical field [0001] The invention belongs to the technical field of pile foundation construction in civil engineering, and in particular relates to a construction technology of dry-work hole grouting piles passing through karst caves, which solves the problem of difficult construction of pile foundations that need to pass through large karst caves. Background technique [0002] my country's karst areas are vast. With the rapid development of my country's infrastructure projects, more and more projects will encounter karst geological conditions, and karst caves have caused great troubles to the progress of projects. The most commonly used foundation form in karst areas is the pile foundation. When the thickness of the upper covering layer (roof) of the karst cave does not meet the bearing capacity requirements, the pile body needs to penetrate the karst cave to meet the bearing capacity requirements of the pile foundation. The traditional construction method needs to fill ...

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Problems solved by technology

[0003] In order to solve the problems of difficult construction of pile foundations passing through large-scale karst caves, high cost, and difficult pouring of pile body concrete in karst caves, the present invention provides a dry-work method drilling (digging) hole pouring pile construction technology for crossing karst caves. The main process principle is : Utilize the light and elastic characteristics of the elastic material filling body, form a stable karst cave filling body by pouring water slurry, and then construct the pile hole through the traditional construction method to form the karst pile foundation

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