Steel stand for mine supporting anchor cable and method for processing same
A technology for supporting anchor cables and processing methods, which is applied to mining equipment, earthwork drilling, and installation of anchor rods, etc., and can solve the problems of small steel strand breaking load, large diameter difference between steel strand and drill hole diameter, and mechanical effects In order to achieve the effect of reducing row spacing, improving stability and safety, and increasing tunneling speed
Inactive Publication Date: 2010-05-19
康红普 +1
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[0009] The purpose of the present invention is to provide a large elongation prestressed steel strand for mine support anchor cable and its processing method to solve the large diameter difference between the diameter of the steel strand and the diameter of the borehole in the prior art, and the The utilization rate of resin anchoring agent (drug coil) is low, and the mechanical effect is poor; the breaking load of steel strand is small; the elongation of steel strand is low, and it cannot adapt to the large deformation of surrounding rock; and the impact absorption energy of steel strand is low The problem
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[0025] see Figure 1 to Figure 6 , the basic structure of the present invention is a plurality of monofilaments that are twisted together, that is, 1×19 monofilaments are divided into three-layer twisted structures of outer layer 3, middle layer 2 and center 1, and the diameter of the monofilaments is φ3.1mm ~φ6.0mm.
[0026] figure 1 and figure 2 The monofilament diameters of the three-layer twisted structure shown are all equal in diameter, and the outer layer 3 and the middle layer 2 have the same hand direction (ie, twisting direction).
[0027] image 3 and Figure 4 The monofilament diameters of the three-layer twisted structure shown are also equal in diameter, and the twisting directions of the outer layer 3 and the middle layer 2 are opposite.
[0028] see Figure 5 , the outer layer 3 and the center 1 of the three-layer twisted structure adopt larger diameter monofilaments, and the middle gap layer between the two is filled with smaller diameter monofilaments ...
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A cable for mine support and protective tendon comprise a twisted multi-piece cable that uses 1X 19 single wire with outside, middle and center layer structure and the diameter of the single wire ranges from phi3.1mm-phi6mm. The process includes the following procedures: rod bundle->inspection->acid dipping and bonderizing->inspection->pulling->semi-finished parts inspection -> predeformation -> twisting-> postdeformation -> eliminating stress -> layered tangle -> inspection -> packing and warehouse. The mine support and protective tendon uses big elongation prestress cable with diameters of 18mm,20mm, and 22mm respectively, made of three 1X19 wires in concurrent and reverse twist, broken load reaching over 400KN,,450KN,550KN respectively and the elongation rate after broken more than 7%.Used in lane support and protect, the invention greatly improves the mine lane's stability and security and digging speed, and effectively reduces the spacing between tendon.
Description
technical field [0001] The invention relates to a large-elongation prestressed steel strand for mine support anchor cables and a processing method thereof. Background technique [0002] At present, my country's prestressed concrete components and rock-soil anchorage widely use 1×7 structural steel strands with diameters of 12.7mm and 15.24mm, and their breaking loads are 184KN and 260KN respectively, and the elongation is only ≥3.5%. Mine roadway supports are all borrowed from prestressed steel strands for construction, and the diameter, breaking load, and elongation of the steel strands cannot meet the requirements of mine support. [0003] In recent years, my country's coal mine safety accidents have occurred frequently, and gas, flood, and roof accidents are closely related to the strength and ductility of prestressed steel. At present, the main problems existing in the prestressed steel strand of mine small-aperture anchor cable are: [0004] 1. The diameter of the ste...
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IPC IPC(8): E21D21/00
Inventor 康红普李明远鲍海山金庆波毛爱菊张伟君
Owner 康红普