Recoverable composite anchor rod and construction method thereof

Abstract

The invention relates to a recoverable composite anchor rod and a construction method thereof in the field of geotechnical engineering anchoring. The recoverable composite anchor rod comprises a hot melt force transfer strip (2), a steel bar or a steel stranded wire (3), a heater (4) and a cement-soil anchor body (1), wherein the cement-soil anchor body (1) is connected with a rock-soil body (5) and provides anti-pulling bearing force; and the anti-pulling bearing force of the anchor rod is transferred through the gripping action of the hot melt force transfer strip (2), and the anchor rod is recovered by melting the hot melt force transfer strip (2). The anti-pulling bearing force of the anchor rod is improved, and the main stressed members of the anchor rod are convenient to recover simultaneously; and the anchor rod has a high recovery rate, is convenient to recover and construct, has low manufacturing cost and prominent environmental-friendly benefits, successfully solves the problem that the anchor rod exceeds a property line underground in cities during construction, can be widely applied to the fields of foundation pit enclosure engineering and the like, and can be popularized in soft soil areas.

Description

technical field [0001] The invention relates to the field of civil engineering, in particular to the field of design geotechnical anchoring engineering. Background technique [0002] With the rapid development of engineering construction, especially the development of underground space, the demand for anchor rods in engineering construction such as foundation pit enclosure and slope support is increasing day by day. It is difficult to develop the underground space of adjacent sites, which limits the application of anchor rods to a large extent. In order to realize the recovery of the bolt body, the existing recyclable bolts mainly include construction techniques such as various bolts connected by mechanical threads, U-shaped detachable bolts, and the like. The recent comparative literature of retrievable bolts is Chinese patent 01234117.7. This technology and other retrievable bolt technologies all use a thread-like connection technology. Through the mechanical movement of ...

AI Technical Summary

Problems solved by technology

The recent comparative literature of retrievable bolts is Chinese patent 01234117.7. This technology and other retrievable bolt technologies all use a thread-like connection technology. Through the mechanical movement of the rod body, the used bolt can be recovered as a force-bearing body. From the non-recyclable body, so as to achieve the purpose of recycling the rod body, this technology has the following defects: first, the prior art connects the recyclable body and the non-recyclable body through mechanical connection, and the manufacturing process is complicated and the cost is high; After the bolt is constructed, it is difficult to maintain the original straight line state of the bolt during drilling construction, self-weight and stress, so it is difficult to realize the rotation and other movement modes when the bolt is recovered. Engineering experience has proved that when the bolt is relatively For a long time (such as the soil nails in the current soil nail wall foundation pit support), it is difficult to achieve the purpose of recycling, so it is difficult for this type of recyclable anchor to be widely used in the field of civil engineering

The disadvantages of this technology are: first, during the use of this technology, the distribution force on the steel strand along the direction is small and uneven; second, the pulling force is large during recovery, and recovery is difficult; third, the construction process complex and expensive

Due to the above defects, although this technology has appeared for many years, it is still difficult to promote

Images