Profiled bar freezing wall foundation ditch combined enclosure method and its structure

Abstract

The invention discloses a method for combination enclosure protection of profiled bar frozen wall pit, and a structure thereof, belonging to the technical field of the building construction. The method comprises the steps as follows: according to the excavation limit specified in the construction drawing, the frozen wall construction and the insertion position of the profiled bar are determined; a guide trough is excavated at the insertion position of the profiled bar; a guideway is arranged right above a guide ditch; the profiled bar is pressed in soil by the self-gravity of the profiled bar and the external load; the soil layer is frozen by an indirect cooling type (the salt water is cooled by a freezing machine; subsequently, the low-temperature salt water is circulated in a liquid inlet pipe, a freezing pipe and a liquid returning pipe). A top-pressing beam is constructed along the circumference of the pit at the position where the profiled bar is inserted, so as to improve the whole stiffness of the frozen wall; after the basement structure is completed, the freezing is released immediately and the profiled bar and the freezing pipe are recycled. The invention has the advantages of high strength and good load-bearing capability and can be suitable for various soil layers and various underground engineering.

Description

technical field [0001] The invention relates to a foundation pit enclosure method and structure, in particular to a foundation pit combined enclosure method and structure using section steel frozen walls. Background technique [0002] In recent years, the foundation pit protection project has developed into a new period characterized by deep, large and complex, especially in the major cities along the southeast coast of my country, the foundation is weak, often accompanied by silt and quicksand, the groundwater level is high, and the soil quality The conditions are complex, the soil quality is poor, and water stop has become a major problem. At this time, when large-scale foundation pits are excavated, the foundation pit enclosure is becoming more and more difficult and the cost is getting higher and higher. Although some combined enclosures can achieve certain results , but its impact on the surrounding environment and high costs are often unacceptable. For this reason, it i...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of the existing frozen wall foundation pit enclosure. The primary purpose of the present invention is to provide a kind of high strength, excellent mechanical performance, good water sealing effect, which can adapt to various soil layers and various underground projects. Combined Enclosure Method of Section Steel Frozen Wall Foundation Pit

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