Semi-rigid abnormal beam anchor cable truss roadway supporting system

Abstract

The invention relates to a semi-rigid abnormal beam anchor cable truss roadway supporting system. A metal net is paved on the surface of a roadway, a semi-rigid abnormal beam anchor cable truss is arranged at a coal-rock roof or a roadway side, the semi-rigid abnormal beam anchor cable truss is formed by abnormal beams with semi-rigid nodes and anchor cables or anchor rods, and each abnormal beam is provided with a plurality of anchor cables or anchor rods; the anchor cables and anchor rods are anchored into a rock layer by passing through the abnormal beams and the metal net and apply a prestress to form an extrusion and annular protection function on surrounding rocks; and outer anchor ends of the anchor cables and anchor rods are provided with trays and locks, the trays and the locks make the end heads of the anchor cables or anchor rods tightly matched with the abnormal beams. The invention has the advantages that: (1), the protective surface area is large, the rigidity is high, stability is not easy to loss, and the integrality of the supporting system is ensured; (2), a steel material is saved, the cost is reduced, and the efficiency is increased; (3), the strength is high, and the regulation space of the whole supporting performance is large; and (4) the semi-rigid nodes can play a role of better flexible yield, and the stability and the safety of the whole supporting system are ensured.

Description

technical field [0001] The invention relates to the field of mine roadway support, in particular to a semi-rigid special-shaped beam anchor cable truss roadway support system. Background technique [0002] At present, coal mine roadway support technology is a key technology in coal mining. Maintaining the stability of the surrounding rock and preventing excessive deformation and damage of the roadway is a necessary condition for safe and efficient mine production. With the development of the depth and breadth of the mine, the problem of roadway support becomes more and more prominent. [0003] At present, the bolting technology of coal roadway is becoming more and more mature, and the range of bolting has been gradually applied from the surrounding rocks of grades I, II and III to the surrounding rocks of grades IV and V. However, under these complex conditions, especially for deep, high-in-situ stress and long-span roadways, the deformation of the roadway roof separation ...

AI Technical Summary

Problems solved by technology

However, under these complex conditions, especially for deep, high-in-situ stress and long-span roadways, the deformation of the roadway roof separation layer is particularly serious, and the current use of bolts and cables alone cannot effectively support the roof. In addition, due to the high stress, the side of the coal seam roadway is also deformed greatly, which often causes the roadway to shrink and deform, making the roadway unusable

Especially for gob-side entry, the currently used high-performance bolt combination support technology is also powerless

The deformation of the side of the roadway, especially the side of the coal pillar, has obvious deformation at the beginning of the roadway excavation. In the mining stage, the deformation usually reaches more than 70% of the total deformation, and the section shrinks by nearly 2 / 3. The roadway cannot be used. even cause safety accidents

Many working faces have to stop production to renovate the roadway or dig another roadway. Not only the support cost is high, the driving speed is low, but also many safety hazards are brought, which seriously restricts the rapid advancement of the coal mining face and the improvement of mine production and efficiency.

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