Cast-in-situ bored pile constructing method for cleaning sediment by gas lift reverse circulation method

Abstract

The invention relates to a cast-in-situ bored pile constructing method for cleaning sediment by a gas lift reverse circulation method. The cast-in-situ bored pile constructing method comprises the following steps: measuring and arranging a pile position, arranging a steel casing at an upper opening of a pile hole, and placing a drilling machine; drilling the pile hole by using the drilling machine, cleaning the pile hole, and installing a reinforcing cage; installing a concrete pipe at the inner lower part of the reinforcing cage; installing a sediment discharging pipe at the top end of the concrete pipe, installing a rubber pipe at a preserved port in the sediment discharging pipe, and enabling the rubber pipe to stretch into the pile hole from the interior of the sediment discharging pipe; connecting the other end of the rubber pipe to an air compressor; connecting the sediment discharging pipe to a slurry purifying device by using a soft pipe; starting up the air compressor, and starting to clean the hole through gas lift reverse circulation; after hole cleaning, pulling the rubber pipe out of the sediment discharging pipe, detaching the sediment discharging pipe, and casting concrete into the pile hole. Before sediment cleaning, construction can be performed only by installing the sediment discharging pipe at the top end and putting down the rubber pipe and by taking out the sediment discharging pipe and the rubber pipe before concrete casting, so that the sediment treatment time is reduced and the sediment treatment effect is very good.

Description

technical field [0001] The invention belongs to the technical field of bored cast-in-situ pile construction, in particular to a bored-in-place pile construction method for cleaning sediment by using an air-lift reverse circulation method. Background technique [0002] In recent years, bored piles have been widely used in the field of foundation pit support and pile foundation construction because of their advantages such as convenient construction and low cost. During the construction of bored piles, in order to prevent the hole wall from collapsing, clay mud or bentonite mud is generally used to protect the wall. The gravel and gravel generated during drilling cannot be completely discharged out of the hole with the mud, and some will slowly settle to the bottom of the hole. , forming sediment. Sediment is an important factor affecting the bearing capacity of pile foundations. If the cleaning fails to meet the specification requirements, it will seriously affect the bearin...

AI Technical Summary

Problems solved by technology

Sediment is an important factor affecting the bearing capacity of the pile foundation. If the cleaning fails to meet the specification requirements, it will seriously affect the bearing capacity of the pile foundation

The traditional method of cleaning sediment is gas lift reverse circulation method. This method uses a special sediment pipe to cooperate with an air compressor to clean the hole. Very cumbersome and labor cost is high

2. The effect of sediment treatment is general

After the sediment is cleaned, it needs to be disassembled section by section. During this process, some suspended particles in the mud will slowly deposit on the bottom of the sediment, which may make the thickness of the sediment that meets the specification requirements unqualified again.

3. The use and discharge of mud is large, polluting the environment, and also increasing the construction cost

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