Pneumatic anti-settling circulation system for bored pile mud and its application method

Abstract

The invention relates to a drilled-pile mud pneumatic anti-settling circulatory system and an application method thereof. The drilled-pile mud pneumatic anti-settling circulatory system is structurally characterized in that an air compressor is mounted on a construction platform, a tee-joint connector is connected with a main air supply pipeline formed by a holed high-pressure air duct, a high-pressure ventilation steel tube, two to three high-pressure ventilation hoses and high-pressure air hose counterweights are arranged in a drill hole, the high-pressure ventilation steel tube and a steel reinforcement cage are fixed on the construction platform, the high-pressure ventilation steel tube is connected with the tee-joint connector, the main air supply pipeline and the air compressor, the spacing between the high-pressure ventilation flexible tubes and the hole wall is not less than 50cm, the spacing between the high-pressure ventilation flexible tubes and the hole bottom is kept between 40cm to 50cm. The drilled-pile mud pneumatic anti-settling circulatory system has the advantages that the problem that pile foundation concrete quality is affected due to the fact that part of the particles of mud sink to the hole bottom because of gravity under the stationary state of the mud is solved; the drilled-pile mud pneumatic anti-settling circulatory system is small in system investment, simple to operate and capable of greatly improving pile foundation concrete pouring quality.

Description

technical field [0001] The invention relates to a pneumatic anti-settling circulation system for bored pile mud and its use method, which belongs to the technical field of bridge bored pile construction, and is particularly suitable for bridges with high silt content in the mud and fast silt sedimentation after hole cleaning Bored pile construction. Background technique [0002] In bridge construction, when the geology of the borehole is a rocky rock formation, fine particles are easily produced after the rock is broken; or when the grouting material of the bored pile is affected by the region and construction environment, it is impossible to use high-quality grouting materials, and the grouting When the clay contains very fine silt particles, these fine particles often cannot be completely replaced or cleaned in the cleaning hole. Therefore, during the period from the completion of hole cleaning to concrete pouring, the fine particles in the mud gradually precipitated, res...

AI Technical Summary

Problems solved by technology

[0002] In bridge construction, when the geology of the borehole is a rocky rock formation, fine particles are easily produced after the rock is broken; or when the grouting material of the bored pile is affected by the region and construction environment, it is impossible to use high-quality grouting materials, and the grouting When the clay contains very fine silt particles, these fine particles are often not completely replaced or cleaned in the cleaning hole

Therefore, during the period from the completion of hole cleaning to concrete pouring, the fine particles in the mud gradually precipitated, resulting in an increase in the thickness of the ballast at the bottom of the hole.

The increase in the thickness of the ballast not only increases the flow resistance of the concrete at the bottom of the hole, but also causes the phenomenon that the concrete pouring is not smooth after the ball is pulled out

On the other hand, the ballast will also be pushed by the concrete to a certain point at the bottom of the pile foundation, resulting in local concrete pouring quality defects at the bottom of the pile and affecting the bearing capacity of the pile foundation.

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