A drillable bolt device and construction method capable of realizing cross anchorage

Abstract

The invention discloses a drillable anchor rod device capable of being anchored in a crossed mode and a construction method. The drillable anchor rod device capable of being anchored in the crossed mode comprises a transmission rod, a tray, a hollow anchor rod, a transmission gear, a fixing rod, bearings, an anchor rod drill and telescopic drills. The transmission rod is connected with a driving gear in the hollow anchor rod. The tray is installed at the rear end of the hollow anchor rod, and the drill rod drill is installed at the front end of the hollow anchor rod. The multiple telescopic drills are installed on the lateral wall of the hollow anchor rod through the bearings. The multiple telescopic drills are arranged on the lateral wall of the hollow anchor rod of the drillable anchor rod device capable of being anchored in the crossed mode, the telescopic drills can drill holes in surrounding rock, crossed anchoring is achieved, the anchoring quality is good, the anchoring length is effectively reduced, and supporting cost is reduced.

Description

technical field [0001] The invention relates to a drillable bolt device and a construction method capable of realizing cross anchorage. Background technique [0002] With the continuous development of modern economy and science and technology, underground engineering construction, especially shaft engineering, continues to develop deep. At the same time, the phenomenon of large deformation of shafts and chambers under complex stress environments can be seen everywhere. Reasonable support for excavated roadways, chambers, and tunnel surrounding rocks is an important means to prevent deformation of surrounding rocks. The current support is based on bolt support and the combination of bolt support and bolt support, which has become a main support method in today's shaft engineering and tunnel construction. [0003] The development of anchors has undergone several changes. Steel structure anchors have high shear and tensile strength, remarkable construction effects, and low co...

AI Technical Summary

Problems solved by technology

However, for the hollow resin anchor, due to its complicated construction technology, it not only prolongs the support time of the anchor, but also increases the safety hazards of the construction workers; Determine the anchoring position at the end of the anchor rod, but the expected anchoring effect cannot be achieved

In addition, due to the harsh construction environment of the anchor bolt, the anchoring agent and the injected cement slurry are often corroded and oxidized by groundwater and air rich in various chemical components, resulting in a greatly reduced anchorage strength; and the anchoring agent has a certain fluidity, A certain degree of overflow will also occur during the installation of the anchor bolt and after the installation is affected by the disturbance of the adjacent working area, and the grouting anchor bolt is also often not full during the grouting process.

Due to the existence of these problems, a large area of ​​deformation and cracking will be formed on the support part in the long run, which will increase the maintenance cost in the later period

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