Secondary hole cleaning device and method of bottom of cast-in-situ bored pile

Abstract

The invention provides a secondary hole cleaning device and method of the bottom of a cast-in-situ bored pile. The secondary hole cleaning device comprises an annular nozzle, a water guide pipe, a pump, a medium tank, an air compressor and an air pipe; the air pipe and the water guide pipe are fixedly connected with a reinforcement cage along the length direction of the reinforcement cage; one end of the air pipe is connected with the air compressor; the other end of the air pipe is inserted into the bottom of a bore hole; one end of the pump is connected with the medium tank; the other end of the pump is connected with one end of the water guide pipe; the other end of the water guide pipe is connected with the annual nozzle which is fixed at the bottom of the reinforcement cage. According to the secondary hole cleaning device and method of the bottom of the cast-in-situ bored pile, the working principle of underwater concrete casting is utilized, the technical method that sediment cannot be produced at the bottom of the bore hole before first concrete is cast is adopted, and accordingly sediment is not produced at the bottom of the cast-in-situ bored pile in the end and the concept that slurry needs to be replaced in the former secondary hole cleaning is changed; the problem that a waiting time is required to form the sediment from the secondary hole cleaning to the concrete casting formerly is solved; the quality of the cast concrete pile is easy to guarantee.

Description

technical field [0001] The invention relates to a pile foundation construction method in the construction field, in particular to a device and method for secondary hole cleaning at the bottom of a bored cast-in-situ pile. Background technique [0002] With the continuous construction of urban infrastructure, such as bridges and high-rise buildings, the development of larger spans and higher heights requires higher bearing capacity of pile foundations. The bored pile is currently the most widely used form of pile foundation, and the construction of the bored pile is also constantly developing in the direction of large-diameter and ultra-deep piles. Due to the influence of geological conditions and surrounding environments, its technology is complicated. The reliability and difficulty of construction are also unprecedented. In particular, the residue at the bottom of bored piles cannot fully guarantee the control index of pile foundation settlement, and most of the bored pile...

AI Technical Summary

Problems solved by technology

However, due to its working characteristics, the effect on piles within more than 10 meters is not good; for large-diameter piles, it is necessary to move the conduit in the hole to remove the sediment. When the depth of the hole is deep, it is troublesome to move the conduit. And lifting the air supply pipe will increase the construction time. During the period between lifting the air supply pipe after stopping work and installing the hopper before pouring concrete, there may be mud and sediment due to various reasons. Therefore, it cannot be completely ruled out.

And because of a large amount of mud replacement, it is also unfavorable to the environment and cost

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