Expanded head anchor cable/rod construction device and method

Abstract

The invention belongs to the technical field of deep foundation pit supporting, and relates to an expanded-head anchor cable / rod construction device and method. Hollow gaskets on the two sides are in threaded connection with a gear through connecting strips, round holes are formed in the middles of the hollow gaskets on the two sides, a control line is wound around a drill rod and rotates along with the drill rod, and a controller is connected with an electric device through the control line; the cutting knives are evenly distributed on the hollow gaskets on the two sides and used for cutting soil in the drilling onrushing process, buckles are arranged on the inner wall of the round hole and the outer side of the drill rod, the buckle on the inner wall of the round hole is fixedly connected with the buckle on the outer side of the drill rod, and the drill bit is arranged at the end of the drill rod. The overall structure and process are simple, operation is convenient, construction efficiency is improved, the construction period is shortened, the construction process is improved, waste of cement paste is reduced, grouting materials are saved, cost is reduced, economic benefits are high, after construction is finished, the whole device can be carried out through the drill rod, and cyclic utilization is achieved.

Description

technical field [0001] The invention belongs to the technical field of deep foundation pit support, and relates to a construction device and method for expanding an anchor cable / rod in the process of hole reaming and anchor cable / rod placement. Background technique [0002] With the rapid development of the economy, the scale of the city is also getting larger and larger, making the buildings extend deeper and deeper underground, the utilization rate of the urban underground space is gradually increasing, and there are more and more deep foundation pit projects in urban construction. Because the anchor cable / rod support system has the advantages of fast construction speed, low cost and applicable to various complex geological conditions, it is widely popularized and applied in urban underground engineering construction. [0003] Compared with ordinary anchor cables, the enlarged head anchor cable solves the problem of small single uplift bearing capacity of ordinary anchor c...

AI Technical Summary

Problems solved by technology

[0004] At present, the construction method of expanding the anchor cable is mostly high-pressure jet spraying. This method is relatively expensive and cannot accurately control the diameter of the reaming hole. In addition, it is extremely difficult to center the anchor cable during the installation process, forming an eccentric tension member, which affects the anchor cable. pull-out capacity

In recent years, few technologies have been disclosed about the construction of anchor cables with enlarged heads. The patent (CN 106592588 A) discloses a method for constructing anchor cables with mechanically reamed enlarged heads. Cable hole, after drilling to the design depth, withdraw the drill pipe, remove the original drill bit, and replace it with a mechanical reaming bit to expand the hole forward, but the wall is not protected during the drilling and reaming process, and the hole wall is easy to collapse; the anchor cable The installation is to install an expansion head anchor cable centering bracket at the end of the anchor cable, or add a guide steel pipe in the middle of the anchor cable

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