Method for forming cast-in-place pile in karst development area

Abstract

The invention relates to the technical field of cast-in-place piles, and discloses a method for forming a cast-in-place pile in a karst development area. The method comprises the following construction steps that (1) a full-slewing drilling machine is used for driving a sleeve to rotate and press downwards, and a pile hole is formed in the sleeve;(2) a slag removal barrel is put into the sleeve for primary hole cleaning, and sediment at the bottom of the pile hole falls into a containing cavity of the slag removal barrel from top to bottom;(3) a reinforcement cage is arranged below the interior of the pile hole, the periphery of the reinforcement cage is wrapped with a metal outer wire net, and the periphery of the metal outer wire net is wrapped with a dense-mesh nylon net;(4) a slag removing head is put into the pile hole for secondary hole cleaning, and the sediment is driven to upwards surge to be in a suspended state;(5) concrete is poured into the pile hole through a pouring pipe, and meanwhile the sleeve is upwards and longitudinally pulled out; the method for forming the cast-in-place pile in the karst development area has the following advantages that (1) drilling efficiency is high;(2) a problem of diffusion and loss of concrete towards a karst cave after the sleeve is pulled out is solved;(3) loss of the concrete is effectively controlled; and (4) on-site civilized construction condition is good.

Description

Technical field [0001] The present invention patent relates to the field of pile, in particular, it relates to pile into the pile region Karst method. Background technique [0002] In karst area, the general geological structure is complicated, caves and fissures common development. Cave generally have a single, multi-layer (beaded) cave, a small cave (hole ≤3m high), a large cave (high-dong> 3m), a full-filled, semi-filled, unfilled cave; showed fissures solution groove, lyocell, stalagmites, stone bud development, in particular wherein the rock surface is inclined larger. [0003] Pile construction in karst area, generally the most common use of impact and Rotary Drilling hole technology, Rotary Drilling into the hole in the process, the process requires the use of partial holes filled with concrete, since the surface is inclined rock drill often causes uneven stress uniform, easily inclined holes occur, sticking, out drill, impact drill requires repeated backfill stone, cla...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a pile-forming method for cast-in-place piles in karst development areas, aiming to solve the problem in the prior art that when the pile body concrete is poured through the pouring pipe, the concrete is easily filled along the karst cave, resulting in a large amount of concrete overfilling

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