Self-drilling RCA (recycling composite anchor) rod and construction method thereof

Abstract

The invention relates to a self-drilling RCA (recycling composite anchor) rod and a construction method thereof. The self-drilling RCA rod comprises a hollow drill rod (1), a hot-melting transmission belt (2), a high-pressure nozzle (3) and a high-pressure jet grouting pile anchor (4). Recycling of the anchor rod is realized via the hot-melting transmission belt (2). In construction, an anchor rod body is also utilized as the drill rod for constructing a high-pressure jet grouting pile. The self-drilling RCA rod has the advantages that uplift bearing capacity is higher, a main stressed component of the anchor rod is convenient to recycle, mounting efficiency and recycling efficiency are higher, construction in mounting and recycling is facilitated, production cost is low, the benefit of environmental protection is outstanding, and the problem that the anchor rod, utilized underground during urban construction, surpasses a boundary line of land is successfully solved. In addition, the self-drilling RCA rod can be widely applied to engineering fields such as foundation pit support.

Description

technical field [0001] The invention relates to the field of geotechnical anchoring engineering in the field of civil 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 the rod body, the used...

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 suffered by the steel strand along the line direction is small and uneven, and the bearing capacity of the anchor is low; second, the pulling force is large during recovery, and recovery is difficult; Third, the construction process of this technology is complicated and the cost is high

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

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