Construction method for open caisson on soft soil layer

Abstract

The invention discloses a construction method for an open caisson on a soft soil layer. According to the construction method, cement mixing piles are arranged at the bottom of the edge of the open caisson, drilling and grouting are carried out on the periphery of the open caisson before the open caisson is sunk, uniform and controllable self-sinking of the open caisson can be guaranteed along withthe fact that earthworks are excavated and transported out in the sinking process of the open caisson by adopting a drainage method, so that the problems of excess sinking and sudden sinking of the open caisson in the sinking process can be solved, when the open caisson sinks to the tops of the cement mixing piles, the mixing piles are uniformly broken at intervals layer by layer, large sand bagsare synchronously and uniformly arranged, unloading self-sinking is carried out by utilizing the sand bags filled with sands, namely sandboxes, and therefore safe and uniform controlled sinking of the open caisson can be realized, and sharp sinking and inclination of the open caisson can be prevented. The construction method for the open caisson on the soft soil layer has the advantages that a construction technology is convenient to use and reliable, materials are convenient to obtain, the construction process is safe and reliable, and therefore the problem that the safety quality risk is caused due to the fact that an open caisson is constructed in the soft soil layer can be solved in a targeted mode, the construction quality and safety of the open caisson are guaranteed, the construction cost is effectively lowered, and the method conforms to the national energy conservation and environment protection requirements.

Description

technical field [0001] The invention relates to a caisson construction method in soft soil layer. Background technique [0002] The caisson structure is on the ground and pit where the caisson is built, and the open reinforced concrete shaft is made first to achieve the full height or partial height (when segmented), and after reaching a certain strength, the shaft is continuously layered manually or mechanically When excavating and transporting soil, as the soil surface in the well gradually decreases, the caisson body will use its own weight (or under the action of an external load) to overcome the friction between the soil wall and the resistance of the soil under the blade foot, and the soil will continue to cut and sink. When adopting segmental production, during the sinking process of the shaft or in each stage of the sinking, the shaft is raised section by section, and the soil is continued to sink, and so on. After the edge of the shaft reaches the design elevation, ...

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Problems solved by technology

[0004] Aiming at the quality problems that may occur in the construction of large-diameter caissons in soft soil layers, the present invention proposes a construction method for caissons in soft soil layers, with the purpose of avoiding caisson inclination when large-diameter caissons sink in soft soil layers and over-sinking and other quality problems, so that the caisson can be smoothly sank to the design elevation position

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