Flexible anchor rod

Abstract

The invention discloses a flexible anchor rod, and is applicable to the field of coal mine tunnel support engineering. The flexible anchor rod comprises a flexible anchor rod body, a tray, a fixed torque nut, an antifriction gasket and a twist-preventing self-aligning ball head; the flexible anchor rod body comprises a connecting sleeve, a steel strand, a limiting tube and a friction-increasing wire spring, a connecting sleeve and the steel strand and the wire spring achieve reliable fixation through compression, and the limiting tube sleeves the connecting sleeve; in the preloading process, the tray is clamped with the surface of a rock mass through a limiting column to prevent rotation, the twist-preventing self-aligning ball head achieves circumferential limiting with the tray through afirst protrusion and achieves circumferential limiting with the flexible anchor rod body through a second protrusion, and then the phenomenon that in the preloading process, the anchor rod body rotates along with the nut is prevented. The flexible anchor rod is not limited by the height of a tunnel, the support effect is effectively enhanced, by means of the special twist-preventing structure, the rod body twisting problem in the preloading process of the flexible anchor rod is solved, the preload is improved, the anchor rod is spirally preloaded, the construction speed is increased, and thesupport efficiency is high.

Description

technical field [0001] The invention relates to a flexible anchor rod, in particular to a flexible anchor rod used in the field of coal mine roadway support engineering. Background technique [0002] At present, bolting technology has been widely used in coal mine roadways in my country. At first, it was used in rock roadways with relatively stable surrounding rocks. Later, by improving the rigidity and strength of bolting materials, bolting technology can adapt to soft and broken surrounding rocks. Roadways, roadways affected by mining and other roadways with various harsh conditions. Bolt support mainly uses bolts to drive into the preset drilling holes in the surrounding rock of the roadway, and combines the shallow broken surrounding rock mass with the deep stable rock mass to achieve the purpose of controlling the deformation of the roadway and realizing the safety and stability of the roadway. [0003] The anchor is very important in the bolt support system, so there a...

AI Technical Summary

Problems solved by technology

However, due to the limitation of the height of the roadway, the length of the bolt can only be maintained at about 2m, and the thickness of the anchorage area of ​​the bolt can only be 2m, which is not suitable for the complex geological conditions of the current roadway.

Although the anchor cable can be long enough, compared with the anchor rod, the installation process of the anchor cable is relatively complicated, and it needs to be stretched by the pump body later, which restricts the tunneling speed of the coal roadway. The greater the tightening force, the site cannot apply a sufficient pre-tightening force, and the limited pre-tightening force cannot effectively reinforce the anchorage area of ​​the anchor cable, and the deformation of the roadway cannot be well controlled

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