Open caisson pressing sinking method construction method

Abstract

The invention discloses an open caisson pressing sinking method construction method. The open caisson pressing sinking method construction method comprises construction preparing work, foundation pitexcavating, sand cushion layer and plain concrete cushion layer manufacturing, foundation pit excavating, sand cushion layer and plain concrete cushion layer manufacturing, open caisson first joint, second joint and third joint manufacturing, open caisson first-time sinking, open caisson fourth joint and fifth joint manufacturing and open caisson second-time sinking. The water-discharge-free sinking technology is adopted in an open caisson, the soil sampling manner is cooperation of air mud suction and divers, and pressing sinking method sinking and thixotropic mud resistance reduction sinkingassisting are adopted in the sinking assisting manner. Open caisson underwater plain concrete bottom sealing, open caisson bottom plate manufacturing and pipeline buttress, mud discharging well and tail work construction are conducted. The pressing sinking method is adopted in the open caisson pressing sinking method construction method so that the open caisson posture can be conveniently controlled, the open caisson sinking precision is high, the depth of penetration into a soil layer through an open caisson blade foot is larger through a counter force system, the enough sinking coefficientis achieved, the open caisson sinking speed can be greatly increased, disturbance on an outer soil body is little, differential settlement, deformation, cracking and other phenomena are not likely tohappen to structures, and in the sinking process, the phenomenon of humping cannot happen to a soil bin in a well grid.

Description

technical field [0001] The invention relates to the technical field of caisson construction, in particular to a construction method of caisson sinking method. Background technique [0002] The sinking of the caisson mainly passes through the soil layers, which are plain fill soil layer, silt layer, silty clay layer, and silty sand layer. Among them, the silt layer and silty clay layer have low strength, low permeability, high water content, high compressibility, high sensitivity, thixotropy and rheology. Compared with the silty sand layer, the borehole friction resistance and bearing capacity of the silt layer and silty clay layer are greatly reduced. After the caisson sinks through the silty sand layer and enters the silty clay layer, it is prone to the unfavorable phenomenon of caisson inclination and sudden settlement, which is likely to bring great disturbance to the external soil, and the structure is prone to uneven settlement and deformation , cracking and other phe...

AI Technical Summary

Problems solved by technology

After the caisson sinks through the silty sand layer and enters the silty clay layer, it is prone to the unfavorable phenomenon of caisson inclination and sudden settlement, which is likely to bring great disturbance to the external soil, and the structure is prone to uneven settlement and deformation , cracking and other phenomena; at the same time, the anti-uplift coefficient of the caisson is small, and the soil bin in the well cell will be uplifted to a certain extent during the sinking process

The traditional caisson sinking process has disadvantages such as difficulty in correcting the posture of the caisson, slow sinking, long construction period, and large soil disturbance outside the well. Attitude deflection during the sinking stage, which is difficult to control

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