Layered inner lifting unloading type ground pulling anchor rod and construction method

Abstract

The invention discloses a layered inner lifting unloading type ground anchor rod structure and a construction method thereof, and belongs to the field of supporting and retaining engineering. The layered inner lifting unloading type ground anchor rod support structure comprises lifting unloading steel pipes, anchor rods and an outer tension anchor structure. The lifting unloading steel pipes are composed of first type sleeves, second type sleeves and circular ring steel sheets. The anchor rods are composed of free sections, anchoring sections and stop grouting plugs. The outer tension anchor structure is composed of steel strands, a fixed pulley, a concrete pit, an anchorage pier and twine tighteners. The end, with the circular ring steel sheets, of the lifting unloading steel pipes are arranged on the free sections of the anchor rods in a sleeving mode, and are placed in a stable soil layer. The other ends of the lifting unloading steel pipes are connected with the outer tension anchor structure through the steel strands, and are fixed to the outer surface of a side slope (or a foundation pit). The layered inner lifting unloading type ground anchor rod structure has a simple structure and high bearing capacity, can fully utilize the stable soil layer and the free sections of the anchor rods, and solves the problems that a support structure is difficult to construct and the support structure is prone to crossing a building restriction line due to the face that an current high slope or certain special foundation pits cannot be subjected to piling or pore-forming.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering anchoring, and in particular relates to a layered internal lifting and unloading ground pull anchor, which is suitable for slope and foundation pit support projects. Background technique [0002] In the field of geotechnical engineering support, bolt support is one of the most commonly used support technologies. After years of development, bolt support technology has become relatively mature. How to improve the bearing capacity of bolts is an important issue in solving the waste of bolt materials. factor. In the existing support technology, the simple frame anchor structure cannot be used for higher slopes or deep foundation pits. It is usually combined with row piles as the main structural type of deep foundation pit or high slope support. The structural bearing capacity is high and the construction technology is mature, but the cost is relatively high and uneconomical. For exam...

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Problems solved by technology

[0003] In view of the deficiencies of the above-mentioned support structure and based on the principle of protecting the underground environment and saving resources, the main purpose of the present invention is to provide an internal lifting and unloading ground pull anchor and a construction method to solve the problem that the current high slope or some special foundation pits cannot Difficulty in the construction of the support structure caused by piling or hole formation and the problem that the support structure easily crosses the red line of the building

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