Double-wall hollow open caisson foundation and sinking construction method thereof

Abstract

The invention discloses a double-wall hollow caisson foundation and a sinking construction method thereof. The double-wall hollow caisson foundation is characterized in that a double-wall hollow shaftwith an annular cavity is formed by an inner wall of the shaft and an outer wall of the shaft, so that mud suction equipment can be lowered through the annular cavity, and a mud suction head of the mud suction equipment reaches the bottom foot of the shaft, the bottom foot of the shaft is a blade foot, and the blade foot is arranged on the inner side wall of the bottom foot of the shaft in an integral ring mode; in the process of shaft sinking, an open caisson using the mud suction equipment keeps balance due to internal and external earth pressures and lateral earth pressures, and sinking iscarried out accurately in the vertical direction; under the influence of a cavity below the blade foot, a soil body in the open caisson continuously collapses and vertically sinks under the action ofgravity, thus a vertical downward negative friction is formed on a wall of the open caisson and the vertical force is increased when the open caisson sinks; the process is simple, the construction isconvenient, rapid and accurate sinking is realized, the sinking construction efficiency of the open caisson is improved, and the double-wall hollow caisson foundation and the sinking construction method thereof are suitable for the open caisson construction on land and in water.

Description

technical field [0001] The invention relates to a caisson and a sinking construction method thereof applied in projects such as bridges, house construction, municipal administration, mines, water conservancy and oceans. Background technique [0002] The caisson is made on the ground, open up and down, in the shape of a hollow shaft, with blade feet at the bottom. By removing the soil in the well and the well barrel, it sinks by its own weight or with sinking aids to achieve the underground setting. The depth becomes an underground structure, which is widely used in bridges, housing construction, municipal, mining, water conservancy and marine projects. [0003] The construction of caisson sinking requires structural safety, smooth sinking, and deflection prevention. During the sinking process of the wellbore, not only the frontal resistance from the blade foot must be overcome, but also the frictional resistance between the well wall and the soil must be overcome. With the...

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Problems solved by technology

However, this method uses a special trenching machine, which is expensive and large in size, and is not suitable for small caissons; temporary mud wall protection is required to form the trench, and there are problems such as mud preparation, recycling, mud replacement behind the wall, and potential environmental pollution risks. , material consumption is high, the cost is high, and it cannot be used for water construction

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