A bolt support device for large-section rapid excavation roadway

Abstract

The invention discloses a large-section fast driving roadway and anchor rod supporting device, and relates to the technical field of anchor rod supporting. Two positioning rods of the large-section fast driving roadway and anchor rod supporting device are inserted into cutting grooves in the inner side of an anchored drill hole simultaneously, thus an anchor rod does not move, and the situation that an anchor rod body slides towards the outer side due to soft rock loosening or pre-tightening force and thus a danger occurs is prevented. The design is novel, the structure is simple, using is convenient, springs can achieve a damping effect, are prevented from breaking the anchor rod body in a pressing mode due to the overlarge instantaneous pressure in the process of stretching into the anchored drill hole, and support and protect the inside anchor rod body, the springs can only move in the axial direction through an outer circular pipe and an inner circular pipe, and thus the positionsof the springs are not skewed; and a gas detecting sensor can send the detected concentration to a centralized management center so as to control gas, and safety of workers is improved.

Description

technical field [0001] The invention relates to the technical field of bolt support, in particular to a bolt support device for a large-section rapid excavation roadway. Background technique [0002] Anchor is the most basic part of roadway support in contemporary coal mines. It binds the surrounding rock of the roadway together so that the surrounding rock can support itself. The other end goes deep into the formation, and the whole bolt is divided into a free section and an anchor section. The free section refers to the area where the tension at the head of the anchor is transmitted to the anchor body, and its function is to apply prestress to the anchor; the anchor section refers to The area where the cement paste bonds the prestressed tendons to the soil layer has the function of increasing the bonding friction between the anchor body and the soil layer, increasing the pressure bearing effect of the anchor body, and transmitting the tensile force of the free section to t...

AI Technical Summary

Problems solved by technology

[0003] However, the existing bolt support is generally sent into the borehole and before grouting and anchoring, once the formation pressure is too large, the bearing capacity of the bolt itself cannot withstand the impact of the formation pressure at all. The impact pressure causes the position of the anchor rod to move, and even after the anchor rod is anchored, it is easy to cause axial movement and the prestress applied to the free section becomes smaller, resulting in a reduction in the fastening effect of the anchor rod, especially Especially for roadways with large cross-sections and rapid excavation, due to the period of time after anchoring and grouting, the pre-tightening force is too large, this phenomenon is more likely to occur, which will lead to the collapse of surrounding rocks, resulting in irresistible safety accidents, and, for some In the anchoring of soft rock, the position of the bolt may move due to the looseness of the soft rock, causing the bolt to break away from the formation and unable to play a pressure-bearing role, resulting in danger

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