Anchor rod drawing device and method

Abstract

The invention relates to the technical field of anchor rod pre-tightening devices and discloses an anchor rod drawing device and method. The anchor rod drawing device comprises an anchor rod, a tray, a lockset and a tensioning mechanism. The anchor rod comprises an anchoring part and an unoccupied part, wherein the anchoring part is fixed into an anchor rod hole in coal and rock mass through an anchoring body, and the unoccupied part is exposed outside the anchor rod hole. The tray is mounted on an outer end port of the anchor rod hole. The lockset is mounted on the unoccupied part and presses against the outer side of the tray. The tensioning mechanism is connected with the unoccupied part, draws the anchor rod outwards and presses against the lockset. The anchor rod drawing device is simple in structure, existing tools are utilized fully, a construction method is simple and convenient to implement, and the anchor rod drawing device has the advantages that the anchor rod can be tensioned rapidly and effectively, the pre-tightening force of the anchor rod is increased, thread torque is eliminated, and combined stress concentration of the anchor rod is reduced.

Description

Technical field [0001] The invention relates to the technical field of anchor rod pre-tightening equipment, in particular to an anchor rod pulling device and a method thereof. Background technique [0002] Nowadays, bolt support technology is commonly used in coal mine roadway support. Bolt pre-tightening force is the main indicator of the stiffness of coal mine roadway support. Increasing the bolt pre-tightening force can effectively improve the overall stiffness of the support. The existing anchor rod pre-tightening force mainly uses the method of increasing the bolt nut torque to increase the pre-tightening force. This method has no obvious effect on the increase of the anchor rod pre-tightening force. At the same time, additional torsion is added to the root of the bolt thread, resulting in compound stress concentration, which is easy to Damage to the anchor rod, and even often leads to the fracture and damage of the high-torque stressed anchor rod along the thread root. [00...

AI Technical Summary

Problems solved by technology

The existing pre-tightening force of the anchor mainly uses the method of increasing the torque of the anchor nut to increase the pre-tightening force. This method has no obvious effect on increasing the pre-tightening force of the anchor. Damage the anchor, and often even cause the anchor to be broken and damaged along the root of the thread under high torque force

[0003] With the demand for high-stress roadway support and large-section roadway support in deep mining, the pre-tightening force requirements for bolt support are increasing. The existing method of increasing the pre-tightening force of the bolt by rotating the pre-tightening bolt nut Can no longer meet the needs of the site

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