Tensioning device suitable for underground construction defective anchor rod

Abstract

The invention discloses a tensioning device suitable for an underground construction defective anchor rod. The tensioning device comprises a hollow oil cylinder, an oil cylinder fixing arm, an angle adjusting device, a round table support, a drawing connecting rod and a hydraulic power source. The drawing angle of the drawing connecting rod can be changed through the angle adjusting device so thatthe drawing connecting rod and the construction defective anchor rod can be in a coaxial position, then the drawing connecting rod is connected to the defective anchor rod through a connecting sleeve, and after the position of the angle adjusting device is fixed, radial tension detection is performed on the construction defective anchor rod through the extension of the hollow oil cylinder; and after the detection is completed, the defective anchor rod can be fastened by using a tray and bolts under the condition that the defective anchor rod is under high pre-tightening force. The tensioningdevice can perform a tensile test on the construction defective anchor rod coaxially, thereby effectively detecting the anchoring force of the construction defective anchor rod and applying high pre-tightening force to the construction defective anchor rod.

Description

technical field [0001] The invention relates to a tensioning device for anchor rods, in particular to a tensioning device suitable for defective anchor rods in underground construction. Background technique [0002] With the rapid development of my country's economy and society and the increasing demand for energy, land, transportation, etc., the scale and quantity of underground geotechnical engineering in my country are increasing day by day. Bolt support technology is widely used in geotechnical engineering, mining engineering, railway tunnels, highway tunnels, underground In the construction of surrounding rock reinforcement in various fields such as structural caverns and hydraulic engineering support. The supporting forms of anchor bolts mainly include anchor shotcrete net, anchor shotcrete, and anchor bolt cable. The anchoring agent bears various loads imposed on the overall support structure through the joint action of the grip force between the anchor rod and the ...

AI Technical Summary

Problems solved by technology

However, in the anchoring project, due to the influence of factors such as the surrounding rock conditions of the underground engineering, irregular construction, and professional technical level and experience, the anchor rod is not perpendicular to the rock surface and does not meet the support requirements, that is, there are defects in the anchor rod construction.

In this case, because the anchor has been anchored and cannot be easily removed, it is still necessary to perform a pull-out test and apply a pre-tightening force to this type of anchor so that it can achieve the required support strength, but if Using the existing anchor rod pulling device to tension such defective anchor rods, there are several problems in the following aspects: ①The tensioning device cannot be directly connected to the end of the anchor rod, and different special connectors need to be processed, It makes the device and operation more complicated; ②When performing pull-out detection or applying pre-tightening force, the pull-out cannot be performed coaxially with the anchor rod body, which will cause the tail of the anchor rod to bend or even break easily, and eventually damage the anchor rod ③Because the pulling device and the anchor rod cannot be pulled coaxially, it is impossible to accurately apply high pre-tightening force and detect the anchoring force

Engineering practice shows that with the wide application of bolt anchorage technology in underground engineering, surrounding rock damage and instability, roof accidents and economic losses caused by poor anchorage quality and effect on site are also increasing. Therefore, research and development A device for tensioning anchor rods with construction defects in underground engineering has become an urgent problem to be solved at present

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