Steel pipe column concrete casting construction method employing cavern-pile method

Abstract

The invention discloses a steel pipe column concrete casting construction method employing the cavern-pile method. The steel pipe column concrete casting construction method comprises the following steps that (1) steel pipe columns are hoisted in place and all the steel pipe columns are welded firmly; (2) plastic thin films are used for protecting the surfaces of the steel pipe columns in a wrapping mode; (3) concrete is used for conducting backfill casting on the bottoms of the peripheries of the steel pipe columns, gravels are used for backfilling the middles of the peripheries of the steel pipe columns and concrete is used for backfilling the upper portions of the peripheries of the steel pipe columns; (4) a protection limiting frame of the steel pipe columns is disassembled; (5) concrete casting is conducted on the middles of the steel pipe columns, wherein the casting process is performed continuously, if some special situations occur and the casting process cannot be performed continuously, the intermittent time cannot exceed the concrete final setting time, a layer of cement mortar with the thickness being 10-20 cm and the level the same as that of concrete is cast before concrete is casted every time, and then casting is continued. By the adoption of the construction method, the steel pipe column concrete casting construction speed can be effectively increased, the used materials can be recycled repeatedly, and therefore the cost is effectively lowered.

Description

technical field [0001] The invention relates to a construction method of a subway tunnel, in particular to a construction method for concrete pouring of a steel pipe column by a hole pile method. Background technique [0002] With the development of urbanization, municipal rail transit has become an integral part of the important traffic in the city. Various rail transit lines are arranged in a staggered manner, covering every corner of the city. Rail transit transfers have undoubtedly become the hub of various transportation lines. Although most transfers in China have realized transfers within stations, the transfer lines are long and difficult for passengers. Unnecessary trouble has been brought about; "zero-distance" transfer has become the mainstream trend in the development of urban rail transit; super-high transfer sections need to be set up for zero-distance subway transfers, which are used as transfers between two lines, and steel pipe columns are used as hole piles...

AI Technical Summary

Problems solved by technology

However, the soil excavated in the pilot tunnel has high viscosity and cannot be uniformly dispersed during the backfill process, which will easily cause the axis of the steel pipe column to deviate from the center line, affecting the pouring quality of the steel pipe column

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