Post-grouting pressure type anchor rod and construction method thereof

Abstract

The invention discloses a post-grouting pressure type anchor rod which comprises a pull rod (1). The tail end of the pull rod (1) is provided with a threaded joint which penetrates through a pull rod hole in a bearing plate (3) and is fixed through a threaded casing pipe (4). The lower portion of the pull rod (1) is provided with a grouting body (2). The post-grouting pressure type anchor rod has the advantages that due to the fact that a post-grouting body has the functions of permeating, separating, filling, compacting and solidifying the bottom end and the side wall of the grouting body, the compressive strength of the bottom end of the grouting body is improved; due to the fact that the post-grouting body is made of macromolecule material polymer concrete (mortar) which is high in strength and binding force and resistant to water permeating, the problem that the bearing force of the bottom end of the grouting body is insufficient is solved; due to the fact that the shearing bond stress between the macromolecule material polymer concrete (mortar) and a peripheral soil (rock) layer is larger than that of a common grouting material, under the same design bearing force condition, the length of the anchor rod is reduced, and construction cost is reduced.

Description

technical field [0001] The invention relates to the technical field of engineering, in particular to a post-grouting pressure anchor rod and a construction method thereof. Background technique [0002] In the foundation pit and slope engineering, underground engineering, mining engineering, and building uplift design involved in geotechnical engineering, a main support technology for strengthening the stratum is the use of bolts. According to the different stress states during grouting, anchors can be divided into tension anchors and pressure anchors. [0003] The steel bars (steel strands) of the tension anchor are directly bonded to the grouting body, and the grouting body in the anchorage section is in a state of tension during work, which is prone to tensile cracks and has poor anti-corrosion performance. [0004] The steel bar (steel strand) of the pressure type anchor is not bonded to the grouting body. When the anchor is under tension, the tension is directly transm...

AI Technical Summary

Problems solved by technology

However, due to its special structure, this type of pressure anchor makes the grouting process and tension locking process more complicated than ordinary anchors, and the construction quality is difficult to guarantee and the total price is higher.

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