Steel flower tube pile enclosure structure suitable for upper-soft lower-hard stratum and construction method

Abstract

The invention provides a steel flower tube pile enclosure structure suitable for an upper-soft lower-hard stratum. The steel flower tube pile enclosure structure comprises a top beam. high-pressure jet grouting piles are arranged along the top beam in an overlapping mode, and steel flower tubes are arranged in the high-pressure jet grouting piles; a steel reinforcement cage is inserted into each steel flower tube and comprises steel flower tube inner insertion main reinforcements which are vertically arranged along the steel flower tube and steel flower tube inner insertion stirrups which are arranged perpendicular to the steel flower tube; the tops of the steel flower tubes extend into the top beam, and the steel flower tubes, the top beam stirrups and tie bars are arranged on a plane in a staggered manner; the steel flower tube inner insertion main reinforcements extend out of the steel flower tubes and are bent towards the horizontal direction at the tops of the steel flower tubes; the steel flower tube inner insertion main reinforcements which are horizontally bent on the adjacent steel flower tubes are mutually welded and connected and are mutually vertically staggered on horizontal bending planes; and the horizontal bending planes of the steel flower tube inner insertion main reinforcements are positioned in the top beam. On the basis of ensuring the strength and rigidity of the enclosure structure, the structure has the advantages of low comprehensive manufacturing cost, small occupied space and the like.

Description

technical field [0001] The invention relates to the technical field of infrastructure construction, in particular to an enclosure structure of steel flower pipe piles, which is suitable for shallow foundation pit projects where the upper soft soil base is located in medium and slightly weathered rock layers. Background technique [0002] The foundation pit enclosure structure mainly includes underground diaphragm wall, bored pile, SMW pile, steel sheet pile, grading + soil nail wall and other forms. [0003] The underground diaphragm wall is a concrete wall in the underground soil formed by excavating a deep groove under the mud retaining wall with special digging equipment before excavating the foundation pit, and then pouring concrete into the reinforcement cage. The disadvantage is that the cost is high, and mud wall protection is required during construction, and the mud must be properly disposed of, otherwise it will affect the environment. [0004] Bored pile is a wid...

AI Technical Summary

Problems solved by technology

[0011] The object of the present invention is to provide an enclosure structure of steel flower pipe piles suitable for upper and lower hard strata, so as to solve the problem of high cost of enclosure structures such as ground connection walls and bored piles, limited construction sites without grading conditions, and hard rock conditions. There are many problems such as difficulty in setting up ground steel sheet piles or SMW piles

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