Method and device for controlling subsidence of caisson in weak soil layer

Abstract

The invention discloses a soft soil layer open caisson sinking control method. The method comprises the steps that when an open caisson sinks to a soft soil layer, sealing plates are arranged in the position, located on the soft soil layer, in holes of the open caisson, so that a plurality of confined spaces are formed by the wall of the open caisson, inner partition walls, the surface of the soft soil layer and the sealing plates, and the sinking speed and gesture of the open caisson are adjusted by adjusting the air pressures of the confined spaces. The invention further discloses a soft soil layer open caisson sinking control device. The device comprises the sealing plates which are arranged on the soft soil layer, so that the multiple confined spaces are formed by the wall of the open caisson, the inner partition walls, the surface of the soft soil layer and the sealing plates. All the sealing plates are provided with air inlets and air outlets, inflation devices which communicate with the air inlets, and deflation devices which communicate with the air outlets. The soft soil layer open caisson sinking control method and device can rapidly regulate and control the sinking gesture of the open caisson, sudden sinking of the open caisson in the deep soft soil layer is effectively prevented, and the effect that the open caisson is sunk to the preset sinking position stably and accurately is ensured.

Description

technical field [0001] The invention relates to the field of highway bridge caisson foundation construction. More specifically, the invention relates to a method and device for controlling the subsidence of caissons in weak soil layers. Background technique [0002] The caisson is to excavate the soil in the well, rely on its own gravity to overcome the friction of the well wall and sink to the design elevation, and then seal the bottom with concrete and fill the well hole, making it a gravity foundation for bridge piers or other structures. Applied to soft soil stratum, sandy soil stratum or alluvial zone with thick overburden. The partition wall in the large caisson is divided into multiple compartments and well holes. The caisson sinking construction under ordinary geological conditions generally adopts the method of draining or undrained mud suction sinking, and the posture adjustment and deviation correction during the caisson sinking process can adopt asymmetric load...

AI Technical Summary

Problems solved by technology

However, for the sinking construction of caissons under the geological conditions of deep and weak soil layers such as silt and muddy soil, due to the poor bearing capacity of the soil, based on safety and quality considerations, the sinking of caissons in this soil layer cannot use dredging. The sinking method generally adopts the non-drainage and non-sucking sinking method. Due to the poor soil mechanical properties of soft soil layers such as silt and muddy soil, when the caisson sinks in such soil layers, it is prone to deviation, Due to the phenomenon of excessive inclination and excessive sinking speed, since the attitude control cannot be performed by asymmetric mud suction, the adjustable range of attitude control only by asymmetric loading is limited, and it is impossible to ensure that the caisson sinks stably and accurately to the design position

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