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CN-224228699-U - Double-anchor-head anchor rod device suitable for supporting thin-layer rock body anchor spraying net

CN224228699UCN 224228699 UCN224228699 UCN 224228699UCN-224228699-U

Abstract

The utility model relates to a double-anchor-head anchor rod device suitable for supporting a lamellar rock body anchor spraying net, which comprises a rod body, a first anchor head assembly and a second anchor head assembly, wherein the first anchor head assembly and the second anchor head assembly are arranged on the rod body, the first anchor head assembly comprises a first base plate and a limiting nut used for limiting the first base plate to move outwards, the second anchor head assembly comprises a second base plate and a double-nut locking structure used for pressing the second base plate, one side, far away from the double-nut locking structure, of the second base plate is provided with a plurality of spring base plates, and each spring base plate is connected with the second base plate through a spring. The utility model has convenient use, and the double-nut locking structure is arranged to apply active pretightening force to the rock wall, so that the thin-layer rock body anchor spraying net support ensures the short-term safety and stability of the thin-layer rock body by applying pretightening force through the second anchor head assembly after the double-anchor head anchor rod support is applied and before the re-spraying concrete construction, and can ensure the long-term safety and stability of the thin-layer rock body after the reinforcing steel bar net is hung at the first anchor head assembly and the concrete is re-sprayed.

Inventors

  • ZHANG SUI
  • Wang Yuangeng
  • CAO YANGBING
  • HU QIHANG
  • Shen Hongqian

Assignees

  • 福州大学
  • 贵州省地质矿产勘查开发局一〇三地质大队

Dates

Publication Date
20260512
Application Date
20250626

Claims (7)

  1. 1. The utility model provides a two anchor head stock devices suitable for thin layer form rock body anchor spouts net support, its characterized in that includes the body of rod and sets up first anchor head subassembly and second anchor head subassembly on the body of rod, first anchor head subassembly includes first backing plate and is used for restricting the outwards limit nut who removes of first backing plate, second anchor head subassembly includes the second backing plate and is used for compressing tightly the double nut locking structure of second backing plate, one side that the double nut locking structure was kept away from to the second backing plate is provided with a plurality of spring backing plates, through spring coupling between every spring backing plate and the second backing plate.
  2. 2. A double anchor head bolt apparatus for use in a sheet rock body bolting net according to claim 1, wherein said double nut locking structure comprises a main nut and a secondary nut which are tightened on the main nut and form a mutual pretension.
  3. 3. The double-anchor-head anchor rod device suitable for the anchor spraying net support of the lamellar rock body according to claim 1, wherein a first through hole is formed in the middle of the first base plate for penetrating a rod body.
  4. 4. The double-anchor-head anchor rod device suitable for the anchor spraying net support of the lamellar rock body according to claim 1, wherein a sinking groove is arranged in the middle of the second base plate, and a second through hole is arranged in the middle of the sinking groove and used for penetrating a rod body.
  5. 5. A double anchor head stock device suitable for use in sheet rock anchor net support as claimed in claim 4, wherein locking washers are provided in the countersink.
  6. 6. A double anchor head stock device suitable for use in sheet rock mass anchor grid support according to claim 1, wherein the thickness of the first and second backing plates is not less than 10mm.
  7. 7. A double anchor head bolt apparatus for use in sheet rock anchor net support according to claim 1, wherein adjacent spring pads are spaced 5mm apart.

Description

Double-anchor-head anchor rod device suitable for supporting thin-layer rock body anchor spraying net Technical Field The utility model relates to a double-anchor-head anchor rod device suitable for supporting a thin-layer rock body anchor spraying net. Background Underground engineering such as mine roadways, stopes, traffic tunnels, oil gas storage cave reservoirs and the like often encounter lamellar rock masses, and the rock masses are subjected to cutting and excavation unloading effects of dense structural surfaces, so that surrounding rock bending, sliding or falling and other damage phenomena easily occur on the cave walls, and the safe and efficient construction of the underground engineering is seriously influenced. In order to avoid the construction disasters of the excavation of the lamellar surrounding rock, the stability control of the surrounding rock is generally carried out by adopting an anchor spraying net supporting mode, and the site construction sequence of the anchor spraying net supporting mode is that after the excavation, firstly, the primary spraying concrete is carried out on the wall of the hole, then the hole is drilled and the anchor rod is installed, then, the reinforcing steel bar net is hung, and finally, the re-spraying concrete is carried out. However, after the anchor rod is installed to the completion of the re-spraying concrete, the time interval is generally several hours to several days, at this time, the anchor rod cannot better play a supporting role, the risk of instability of surrounding rock is large, and how to improve the stability of the surrounding rock at this stage is a difficult problem of very important importance of researchers and engineers. Currently, intensive research on anchor rods has been carried out at home and abroad, and important progress has been made. In the aspect of the anchor rod material, a novel anchor rod material such as titanium alloy, aluminum alloy, glass fiber reinforced plastic, carbon fiber and the like, and a cement grouting material such as fiber reinforcement, micro-expansion early strength and the like are provided. In the aspect of the anchor rod structure, the structural forms of a yielding energy-absorbing anchor rod, a detachable anchor rod, an expanding anchor rod and the like are developed. In the aspect of the anchor rod construction process, the precise drilling control technology, the sectional pressure grouting technology, the anchor injection integrated technology and the like are well developed. In the aspect of anchor rod monitoring technology, the fiber bragg grating anchor rod and intelligent monitoring and early warning technology are current development trend. Importantly, novel anchor rods or construction processes such as short anchor section anchor rods, prestress adjustable anchor rods and the like are also provided for lamellar rock mass at present, but the anchor rods are too high in cost and inconvenient to construct, or the stability of the rock mass after construction of anchor rod support and before construction of re-spraying concrete cannot be guaranteed. It is therefore necessary and desirable to provide a new type of rock bolt apparatus suitable for use in the support of thin layer rock body anchoring nets. Disclosure of utility model The utility model improves the problems, namely the technical problem to be solved by the utility model is a double-anchor-head anchor rod device suitable for the anchor spraying net support of the lamellar rock body, and solves the problems that after the anchor rod support is applied and before the concrete is sprayed again, the pulling resistance generated by the solidification of slurry around the lamellar rock body anchor rod of the cave wall is insufficient to support the dead weight of the lamellar rock body, the anchor rod cannot better play a supporting role at the moment, the instability risk of surrounding rock is extremely high, and meanwhile, the active pretightening force cannot be applied to the lamellar rock body of the underground engineering during the ordinary mortar anchor rod support is applied, so that the stability of the surrounding rock cannot be effectively controlled. The utility model is composed in such a way that the utility model comprises a rod body, a first anchor head assembly and a second anchor head assembly, wherein the first anchor head assembly and the second anchor head assembly are arranged on the rod body, the first anchor head assembly comprises a first backing plate and a limiting nut used for limiting the first backing plate to move outwards, the second anchor head assembly comprises a second backing plate and a double-nut locking structure used for pressing the second backing plate, one side of the second backing plate far away from the double-nut locking structure is provided with a plurality of spring backing plates, and each spring backing plate is connected with the second backing plate through a spring. Further,