An unloadable pile-anchor multi-stage support structure and construction method

Abstract

The invention discloses an unloading piled anchor multi-stage support structure and a construction method, and belongs to the technical field of geotechnical engineering anchoring. The unloading piledanchor multi-stage support structure comprises a framed anchor and a piled anchor combination structure. The framed anchor is composed of a frame and anchor rods, and the anchor rods are anchored tothe frame by anchorage devices. The piled anchor combination structure is composed of anchor rods, cast-in-situ bored piles, unloading grouting bearing steel pipes and a crown beam. Enlarge heads arepoured at the bottoms of the cast-in-situ bored piles, and the crown beam is poured at the tops of the cast-in-situ bored piles. The unloading grouting bearing steel pipes penetrate through a reservedpassage on the crown beam to drive into a stable soil body. The ends, penetrating through the unloading grouting bearing steel pipes, of the anchor rods are anchored in the stable soil body, and theother ends of the anchor rods are fixed to the crown beam. Stand columns on the lower portion of the framed anchor are poured on the crown beam. The unloading piled anchor multi-stage support structure and the construction method can fully utilize the lifting action of the unloading grouting bearing steel pipes and the free sections of the anchor rods between an unstable soil body and piles for unloading, the soil pressure acting on pile bodies is reduced, and the problems of the embedded depth, diameter and reinforcement of support piles in row and the length of the anchor rods working with the frame are solved.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering anchoring, and in particular relates to an unloadable pile-anchor multi-stage support structure, which is suitable for slope and foundation pit support projects. Background technique [0002] In recent years, with the rapid development of the economy, the scale of my country's infrastructure construction has continued to expand, and pipeline projects such as roads, railways, and oil and gas transmission have continued to expand, resulting in a large number of support projects, and the proportion of projects under special terrain conditions has also increased year by year. , slope engineering is an important factor restricting engineering construction and normal operation in these areas. At present, the supporting forms of deep foundation pits are mainly row piles and pile-anchor structures. Generally, the stability of the foundation pit slope is ensured by adjusting the diameter of...

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Problems solved by technology

[0003] The main purpose of the present invention is to provide an unloadable pile-anchor multi-stage support structure and construction method to solve the problems of pile body size, large reinforcement and waste of materials in row pile support

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