Strengthening structure for integrated bolting with bar and wire mesh

Abstract

The invention discloses a strengthening structure for integrated bolting with bar and wire mesh. The strengthening structure is disposed on an M-shaped steel strip at metal mesh lap joint of bolting with bar and wire mesh and comprises two rows of connecting nails. The connecting nails are disposed lengthwise along the M-shaped metal mesh and symmetrically distributed on two sides of a groove on the upper surface of the M-shaped metal mesh. The lower end of each connecting nail is fixed to the upper surface of the M-shaped steel mesh. The upper end of each connecting nail is inserted into one mesh of the metal mesh at the metal mesh lap joint. The strengthening structure has the advantages that the when the metal mesh bears acting force of surrounding rock, the connecting nails keep even stress of the metal mesh connection, prevent breakage of part of the metal mesh lap joint caused by stress concentration and effectively prevent pocketing; bolts, the M-shaped steel strip and the metal mesh are integrally connected by the connecting nails, mutual action of the M-shaped steel strip and surrounding rock is enhanced, diffusion range of bolt load to the surrounding rock is increased, and overall strength and reliability of bolting with bar and wire mesh are improved.

Description

technical field [0001] The invention relates to the integrated anchor-beam-net support used in coal mine roadways, in particular to a strengthening structure for the integrated anchor-beam-net support, which is used to enhance the connection strength between metal meshes in the integrated anchor-beam-net support. Background technique [0002] my country's coal mine roadway support has experienced a long process from wood support, masonry support, steel support to bolt support. The beam-net integrated support technology has been applied in the "three soft" coal seams. Years of practical experience at home and abroad have shown that the use of anchor-beam integrated support is an economical and effective support method for roadways, which has gradually replaced miner's steel and U-shaped steel support, and has received good results. The application of this technology And promotion, it provides guarantee for the construction and development of the mining area, the cost of coal ...

AI Technical Summary

Problems solved by technology

[0010] In the net-hanging process, the interconnection between the metal meshes is usually realized by using iron wires at the overlapping points of the metal meshes. Due to the large distance between the connecting points of the iron wires and the insufficient strength of the iron wires, the connection strength at the overlapping points of the metal meshes will be reduced. Low and poor stability. When subjected to the action of surrounding rock, the metal mesh is usually broken, off-net, and wire broken due to the stress concentration at some positions at the connection, and then develops and expands, which makes the phenomenon of mesh pockets aggravated, and may also lead to The hollowing out of the roof may eventually lead to the failure of the anchor rod. At this time, roof accidents such as roof fall and roof falling off are prone to occur, which seriously threatens the personal safety of workers and the efficient and rapid development of enterprises.

Although high-strength and high-rigidity surface protection materials such as high-strength plastic mesh, steel-plastic composite belt, and cold-drawn arc mesh can help solve the net pocket phenomenon of soft broken rock mass and improve the overall stability of the support structure, but if the metal mesh connection strength Low and poor stability, often can not play the high strength and high rigidity characteristics of these surface protection materials, resulting in loose anchor and anchor failure

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