Tensioning device and operation method for high prestressed bolt support in deep roadway

Abstract

The invention discloses a tensioning device for deep roadway high-prestress anchor bolt support and an operation method thereof. The tensioning device comprises a hydraulic oil pump, a hydraulic jack, a connector, and a nut fastening device. The hydraulic oil pump is connected to the hydraulic jack through a hydraulic pipe. The hydraulic jack is composed of a cylinder, a piston, and a piston rod. The outer end of the piston rod is connected with the tail of an anchor bolt through the connector. The nut fastening device sleeves a nut at the tail of the anchor bolt. A pretress can be accurately applied to the anchor bolt, anchor bolt damage or breakage caused by too large prestress is avoided, and the construction cost is greatly saved. Moreover, the tensioning device is simple in structure, reasonable in design, convenient to operate and easy to carry, and is of high practicability in deep roadway high-prestress anchor bolt support engineering.

Description

technical field [0001] The invention relates to a tensioning device for bolt support, in particular to a tensioning device for high prestressed bolt support in deep roadways and an operating method thereof. Background technique [0002] With the gradual development of coal resource development from shallow to deep, the geomechanical environment existing in deep underground projects such as roadways and chambers has become more and more complex, and the deformation of surrounding rocks is generally large, and even large areas of roof caving and collapse have occurred Under such difficult conditions, high prestressed bolt support technology provides an effective way for the stability control of surrounding rock in deep underground engineering, and has been widely used in China . The main mechanism of high prestress bolt support technology to control the large deformation of surrounding rock in deep engineering is to apply high prestress to high strength bolt, thereby promotin...

AI Technical Summary

Problems solved by technology

[0003] However, at present, the application of bolt prestress in deep roadway engineering is mainly realized by ordinary bolt drills, artificial wrench torsion nuts or special bolt installation machines, but these methods of applying bolt prestress have many defects, one of which is The limitation of equipment capacity and personnel operation makes the applied prestress level too low to reach the support design value, which seriously affects the support quality and surrounding rock control effect; the second is that although the installed equipment can provide higher or higher High prestress, but there are still deficiencies in the accuracy of controlling the applied value, it is easy to cause the applied prestress to be much higher than the design predetermined value, causing damage or even breakage of the anchor rod, thus greatly reducing the support effect

The third is that the application efficiency of high prestress is not high enough, which affects the progress of roadway construction

It can be seen that the existing bolt prestressing equipment and methods are difficult to meet the needs of deep large-deformation roadway support engineering. A device that can quickly and accurately provide high prestress is urgently needed in the field implementation of bolt support technology

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