Pile foundation construction method capable of three-dimensional expansion

Abstract

The invention discloses a pile foundation construction method capable of three-dimensional expansion. The pile foundation construction method comprises the following steps: firstly treating a construction field, and boring upper part coverage layer of a limestone cave by adopting a drilling machine and adopting a slurry-free boring construction technology; after boring the upper part coverage layer of the limestone cave, flattening bottom rock layer of the limestone cave; lowering a pile foundation containment apparatus capable of adjusting the height at a folded state to a flat area of the bottom rock layer of the limestone cave by using a hoisting device; adjusting the height of the pile foundation containment apparatus, fixing the height of the pile foundation containment apparatus by virtue of an expansion material, so that the top of the pile foundation containment apparatus is flush with a pile hole of a top rock layer of the limestone cave; boring the bottom rocker layer of thelimestone cave in the pile foundation containment apparatus, and completing the construction of the pile hole; and cleaning the pile hole, then lowering a reinforcement cage, pouring concrete, completing the construction of a pile body, and curing to obtain a poured pile. The pile foundation construction method is simple in construction process, and has the advantages of low cost, high bearing capacity, small disturbance for a geological environment of the limestone cave, simplicity in construction and the like.

Description

technical field [0001] The invention belongs to the technical field of pile foundation construction in civil engineering, and in particular relates to a three-dimensionally expandable pile foundation construction method, which solves the problem that concrete is not easy to pour when a pile body penetrates a large karst cave. Background technique [0002] The karst area in my country is vast, accounting for about 1 / 3 of the country's land area. Therefore, it is inevitable to encounter karst landforms during project construction. Pile foundation is the most commonly used foundation form in karst areas. How to safely and quickly complete pile foundation construction in karst areas has become the primary problem to be solved. In the existing construction technology, the karst cave that the pile foundation needs to penetrate is usually filled with gravel, mud, or the material steel casing follow-up method is used for construction. Both construction methods are less economical....

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Problems solved by technology

[0003] In order to solve the problem that the pile body of the pile foundation penetrating through the karst cave is not easy to be poured into shape, the problem of the original geological disturbance of the karst cave during the backfilling construction of the traditional karst cave is greatly disturbed, and the difficulty in lowering the steel casing in the follow-up construction method of the steel casing is solved. It solves the problem of material waste and high cost of traditional construction methods. It provides a pile foundation construction method that can be expanded in three dimensions. The construction is easy, the original geological disturbance of the cave is small, and the cost is low.

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