Mud anti-drag sink-assisting device in open caisson sinking construction

Abstract

The invention relates to a mud anti-drag sink-assisting device in open caisson sinking construction. A plurality of vertical main mud delivery pipes and rows of horizontal mud pouring pipes are pre-buried in a well wall of an open caisson. A continuous mud pouring pipe is inserted in each vertical main mud delivery pipe and connected with each horizontal mud pouring pipe. Thixotropic mud is poured to the outer side of the well wall in a pressing mode through pre-burying the mud pouring pipes in the well wall, so that friction resistance on an outer well wall is remarkably reduced and sink-assisting effect is achieved. The thixotropic mud depends on two factors to maintain a soil body to be stable. One factor is static force action of the thixotropic mud to the soil body and the static force action is fundamentally distributed along a triangle. The other factor is a gel state of the thixotropic mud, namely, molecular arrangement of the thixotropic mud forms a certain mesh-shaped structure frame and the value of the frame is related to static shearing force of the thixotropic mud and a certain pressure. Therefore, the thixotropic mud plays roles of reducing the friction resistance and maintaining soil wall stability in sinking process of the open caisson. Meanwhile, due to the fact that pouring and pressing the mud is in branch control on the ground, pressure falling amount of each branch can be adjusted so that auxiliary deviation correction can be conducted on the open caisson.

Description

technical field [0001] The invention relates to a caisson sinking construction equipment and process, in particular to a device and a process for reducing lateral frictional resistance of caisson sinking by arranging grouting pipes for grouting outside the well wall. Background technique [0002] During the sinking process of the caisson, the sinking resistance is generally composed of the reaction force of the foundation at the bottom and the frictional resistance between the well wall and the soil. When the sinking depth of the caisson is relatively deep, the side friction resistance may become an important factor hindering the smooth sinking of the caisson. At the same time, the existence of side friction resistance also leads to the subsidence of the surrounding soil during the sinking process of the caisson, causing the settlement of the surrounding soil. Such methods as adopting conventional surcharge ballast to aid sinking, drilling to destroy the soil outside the we...

AI Technical Summary

Problems solved by technology

At the same time, the existence of side friction resistance also causes the sinking process of the caisson to drive the surrounding soil to sink, causing the surrounding soil to settle.

Such as adopting conventional surcharge ballast to help sinking, drilling to destroy the soil outside the well to reduce the side friction of the caisson, etc., it is inconvenient to operate, and the sinking effect is not obvious

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