A large-scale support method and support device for roadway truss anchor cables

Abstract

The invention discloses a large-range supporting method for roadway truss anchor cables and a supporting device. The large-range supporting method for the roadway truss anchor cables comprises the steps that the vertical anchor cable and the multiple inclined anchor cables are anchored in a vertical drilled hole and a plurality of inclined drilled holes in a roadway roof correspondingly; multiplepairs of telescopic trusses are connected in a combined mode through a truss combining member, and the truss combining member is anchored through the vertical anchor cable, and the multiple pairs of telescopic trusses are anchored through the multiple inclined anchor cables correspondingly, so that large-range supporting of the roadway roof is formed; and in the supporting process, horizontal extrusion stress of each pair of telescopic trusses can be adjusted by controlling extending and retracting of the telescopic trusses according to the magnitude of horizontal applied force generated by horizontal motion of the roadway roof, and the horizontal extrusion stress is made to balance the horizontal applied force so as to adapt to or restrain horizontal extrusion dislocation or loosening expansion deformation of the roadway roof. A large-range extrusion stress area can be formed above the surface of the roadway roof, and large-range stable supporting of the roadway roof is achieved.

Description

technical field [0001] The invention relates to the technical field of roadway roof support, in particular to a large-scale support method and a support device for roadway truss anchor cables. Background technique [0002] In recent years, with the continuous improvement of coal mining technology and the continuous improvement of the level of mechanical equipment, large mining height fully mechanized caving mining has become the main coal mining method for 10 million-ton mines to achieve high production and high efficiency. The expansion of mining space will inevitably lead to the intensification of mining disturbance and mine pressure activities. Affected by the complex mining geological environment and severe excavation disturbance, large-section roadways may experience severe subsidence of the roadway roof, even roof collapse, and damage to the support body, thereby inducing large deformations of the surrounding rock of the roadway. Especially when encountering weak and ...

AI Technical Summary

Problems solved by technology

However, for roadways with high levels of stress, complex mining geological environments, severe mining disturbances, and weak and broken roadways, the roadway roof is prone to horizontal extrusion displacement or loosening and expansion deformation due to horizontal movement, resulting in extensive damage to surrounding rocks, which in turn induces roof fall, which is not conducive to Roadway long-term maintenance

The traditional support method cannot effectively control the deformation of this kind of roadway to a certain extent, which is mainly reflected in the following three aspects: ① The single anchor (cable) support method is "point load" support, and the support range is small. Weak jacking capacity, unable to transmit prestress

②Anchor-beam combined support mode is "line load" support. When the roof of the roadway deforms in a large range, the steel belt or steel beam is easily sheared and damaged, and phenomena such as tearing and twisting occur, and the roof protection effect is significantly reduced

However, the current truss support structure is arranged in parallel, which can only provide one-way horizontal extrusion stress. During the horizontal movement of the roof of the roadway, the trusses often loosen and the anchors (cables) fall off and fail, resulting in the trusses not being close to each other. The roof of the roadway weakens the extrusion stress, the support effect drops sharply and the risk of roof fall greatly increases

The horizontal extrusion displacement or loose expansion and large deformation of the roadway roof due to horizontal movement have seriously affected the high production and high efficiency of the mine.

Images