Cast-in-situ bored pile underwater concrete spouting and vibration construction method and device

Abstract

The invention provides a cast-in-situ bored pile underwater concrete spouting and vibration construction method and device, and relates to the technical field of underwater concrete spouting. The cast-in-situ bored pile underwater concrete vibration construction method comprises the following steps that concrete is spouted from the bottom of a pile hole to the position which is higher than an piletop design elevation by 0.8-1.0m or above by adopting a tremie method, so as to form a vibration-free underwater concrete pile body; after a tremie outside the pile hole is inserted into the vibration-free underwater concrete pile body, a vibrating device is used for carrying out first retained vibration, the tremie is lifted after the first retained vibration, then the vibrating device is used for carrying out second retained vibration, the tremie is downward reversely inserted after the second retained vibration, then the vibration device is used for third retained vibration, and the secondretained vibration and the third retained vibration are repeated until the tremie is lifted out of the top surface of the vibration-free underwater concrete pile body. According to the construction method, underwater spouted cast-in-situ bored pile concrete is effectively vibrated, and the compactness of pile body concrete is improved.

Description

technical field [0001] The invention relates to the technical field of underwater concrete pouring, in particular to a construction method and device for underwater concrete pouring and vibration of bored piles. Background technique [0002] Underwater concrete is a kind of self-compacting concrete. After pouring into the pile hole, it gradually becomes dense under the action of the mud pressure on it and the concrete's own gravity. At present, when bored piles are formed with mud retaining walls, the concrete pouring of the pile body is underwater concrete pouring. The specific steps are as follows: before pouring, the conduit is lowered into the pile hole. The lower concrete is poured into the pile hole from the conduit, and the poured concrete flows out from the bottom of the conduit and embeds the bottom of the conduit, so that the inner cavity of the conduit is isolated from the mud in the pile hole. When the concrete burying the bottom of the conduit is greater than 6m...

AI Technical Summary

Problems solved by technology

However, with the above-mentioned underwater concrete pouring process, as the conduit is gradually lifted upwards, the pressure of the newly poured mud and concrete on the concrete gradually decreases. Since the concrete of the pile body cannot be vibrated, the concrete is mainly compacted by its own weight, causing the upper pile body to The density of concrete is relatively poor, and if the strength margin of the underwater concrete mix ratio is small, the strength of the concrete on the upper part of the pile body will be lower than the design strength, resulting in quality accidents

Images