Construction method of large-diameter open caisson in deep and thick soft soil stratum

Abstract

The invention discloses a construction method of a large-diameter open caisson in deep and thick soft soil stratum. The method comprises the following construction steps: performing construction preparation including material preparation and equipment preparation; arranging a cement mixing pile, and driving a deep layer cement mixing pile along the wall of the open caisson, so as to ensure that the deep and thick soft soil stratum forms a composite foundation; arranging a grouting hole, and forming the grouting hole in the exterior of the cement mixing pile; performing foundation pit excavation, and excavating a foundation pit in the composite foundation according to drawings; manufacturing the open caisson; performing open caisson excavation sinking, and adopting a secondary excavation mode to perform segmented sinking; performing bottom sealing, and performing bottom sealing on the bottom of the open caisson after the open caisson sink to a designed elevation. The method can preventsituations of excess of sinking of the open caisson and tilting of the open caisson, and has the advantages of low construction cost and construction difficulty, high safety and reliability and good construction quality which are not belong to the existing prior art.

Description

Technical field [0001] The invention relates to an engineering construction method, in particular to a large-diameter caisson construction method in a deep and thick soft soil layer. Background technique [0002] The caisson is an underground structure in the shape of a shaft. During construction, a shaft-shaped structure is generally made on the surface first, and then under the protection of the shaft wall, the earth is continuously excavated from the shaft, and the caisson structure is used under its own weight (or under the action of an external load). ) Overcoming the friction between the soil wall and the resistance of the soil under the blade foot, the caisson gradually sinks; after reaching the predetermined design elevation, the bottom is sealed to build the internal structure. Caissons are usually used in the construction of foundation pits of large bridge piers, sewage pumping stations, large equipment foundations, air defense shelters, shield assembly wells, pipe jack...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiencies of the prior art, the present invention provides a construction method for large-diameter caissons in deep soft soil strata, which solves the difficulty in controlling the subsidence of caissons in the prior art during the construction of deep soft soil strata and the magnitude of subsidence. Too large, and technical problems such as caisson tilt correction difficulties

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