CN220101310U - Active yielding anchor rod for surrounding rock support - Google Patents
Active yielding anchor rod for surrounding rock support Download PDFInfo
- Publication number
- CN220101310U CN220101310U CN202321467938.5U CN202321467938U CN220101310U CN 220101310 U CN220101310 U CN 220101310U CN 202321467938 U CN202321467938 U CN 202321467938U CN 220101310 U CN220101310 U CN 220101310U
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- Prior art keywords
- rod body
- yielding
- rod
- active
- anchor
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- 239000011435 rock Substances 0.000 title claims abstract description 35
- 238000005553 drilling Methods 0.000 claims abstract description 10
- 239000011440 grout Substances 0.000 claims abstract description 7
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 238000009825 accumulation Methods 0.000 abstract description 2
- 238000010276 construction Methods 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 229910000914 Mn alloy Inorganic materials 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000004636 vulcanized rubber Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Piles And Underground Anchors (AREA)
Abstract
The utility model provides an active yielding anchor rod for surrounding rock support, which comprises a rod body, a self-drilling bit arranged at one axial end of the rod body and an active yielding structure arranged at the other axial end of the rod body; the rod body is a hollow drill rod with continuous threads on the surface; the active yielding structure comprises a grout stop plug, an anchor backing plate, a yielding backing plate, an elastic piece and a nut which are sequentially sleeved on the rod body. According to the utility model, a mode of actively yielding the anchor rod is adopted to provide a deformation space for the rock mass of soft rock and karst geological sections, so that the surrounding rock pressure is released, the deformation energy pile accumulation is reduced, and the service effect of the support structure is better realized.
Description
Technical Field
The utility model relates to the technical field of tunnel construction, in particular to an active yielding anchor rod for surrounding rock support.
Background
Under the prior art, when tunnel engineering construction is carried out in soft rock and karst geological broken zone areas, the surrounding rock support basically adopts a passive strong support mode, namely, a hanging net is adopted to anchor rods and jet concrete for primary support, a steel frame is erected, and secondary lining is constructed to complete tunnel body construction. Under the construction method, the supporting structure can play a role in supporting only after the rock mass is deformed, so that the supporting structure is called a passive supporting mode. And after tunnel excavation, rock mass creep deformation is carried out along with the time after a certain of soft rock and karst geological fracture zone areas, so that larger deformation is accumulated, larger internal force is generated on the supporting structure, the existing supporting structure is likely to be damaged, the tunnel body is deformed, the supporting structure is cracked and water is leaked, and the tunnel body is more seriously likely to collapse.
Disclosure of Invention
The utility model aims to provide an active yielding anchor rod for surrounding rock support, which is used for solving the problem that the support structure is damaged by internal force generated by deformation of soft rock and karst geological section rock mass in the background technology.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
an active yielding anchor rod for surrounding rock support comprises a rod body, a self-drilling bit arranged at one axial end of the rod body and an active yielding structure arranged at the other axial end of the rod body; the rod body is a hollow drill rod with continuous threads on the surface; the active yielding structure comprises a grout stop plug, an anchor backing plate, a yielding backing plate, an elastic piece and a nut which are sequentially sleeved on the rod body.
Further, the rod body is made of high-strength alloy steel, the section of the rod body is a hollow circle, the surface of the rod body is of a rough tooth full thread structure, and the nut can be locked with the thread of the nut in a matching manner.
Further, the elastic piece adopts a rubber spring.
According to the technical scheme, the deformation space is provided for the rock mass of the soft rock and the karst geological section by adopting the mode of actively yielding the anchor rod, so that the surrounding rock pressure is released, the accumulation of deformation energy piles is reduced, the yielding stroke is provided for the rock mass deformation by the rubber spring, and the huge internal force caused by the extrusion of the rock mass deformation to the supporting structure is reduced, so that the service effect of the supporting structure is better realized.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present utility model;
FIG. 2 is a schematic diagram of an active yielding structure according to the present utility model;
in the figure: 1. a rod body; 2. self-drilling drill bit; 3. a grout stop plug; 4. an anchor backing plate; 5. letting the backing plate press; 6. an elastic member; 7. and (3) a nut.
Detailed Description
A preferred embodiment of the present utility model will be described in detail with reference to the accompanying drawings.
The detection device for the active yielding anchor rod for surrounding rock support shown in fig. 1 comprises a rod body 1, a self-drilling bit 2 arranged at one axial end of the rod body 1 and an active yielding structure arranged at the other axial end of the rod body 1; the rod body 1 is a hollow drill rod with continuous threads on the surface; the active yielding structure comprises a grout stop plug 3, an anchor backing plate 4, a yielding backing plate 5, an elastic piece 6 and a nut 7 which are sequentially sleeved on a rod body.
The rod body 1 according to the preferred embodiment is made of high manganese alloy steel, which is a wear-resistant and high-strength metal material having excellent corrosion resistance, impact resistance and heat resistance; the hardness can reach the hardness of HRC 50-60. In addition, the material has good mechanical properties, and the fatigue strength and bending hardness of the material are in the first place of those of the same kind of materials; therefore, the high manganese alloy steel has very high wear resistance and damage resistance, and can effectively improve the supporting performance of the integral anchor rod. Meanwhile, the section of the rod body 1 is a hollow circle, a grouting channel is formed, and three functions of self-drilling, grouting and yielding are integrated; secondly, the surface of the rod body 1 is of a rough tooth full thread structure, the anchoring capability of an anchor rod and a rock mass can be improved, and the nut 7 can be locked with the screw thread in a matching way.
In the concrete use, the anchor rod is connected with a drilling machine, the anchor rod is driven into a rock mass or soil mass to be reinforced through the drilling machine, slurry is pressed into a drill hole from a drill bit through a hollow rod body 1 through the communication of the anchor rod and a grouting machine, cracks and the drill hole of a stratum around the anchor rod are filled, the whole anchor rod body and the surrounding rock mass are solidified into a whole, and the rock mass or soil mass is better reinforced; the grout stop plug 3 can prevent grout from flowing back out of the hole along the drill hole during grouting. Specifically, the rod body 1 is a Gao Meng alloy steel rod with the length of 3 meters, and the length of the rod body 1 is shortened according to the designed drilling depth of construction or a plurality of rod bodies are spliced through a sleeve. If when the construction of a certain tunnel karst fracture area section is performed, the depth of a drilling hole is designed to be 5m, the whole length of a single rod body of the yielding anchor rod is 3m, a connecting sleeve is arranged in the middle of the yielding anchor rod to enable the length of the yielding anchor rod to reach 6m, and the tail of the yielding anchor rod is exposed out of surrounding rock by 40cm and used for installing yielding anchors and reserving yielding space.
The elastic member 6 in the preferred embodiment adopts a rubber spring, specifically as shown in fig. 2, the active yielding structure adopts a composite structure of a nut 7, the rubber spring and a yielding pad plate 5, after the installation is completed, the rubber spring is fastened with a rod body and does not displace, the rubber spring can provide yielding stroke and deformation space for rock mass deformation, and huge internal force caused by extrusion of the rock mass deformation to a supporting structure is reduced; the anchor backing plate 4 and the yielding backing plate 5 mainly ensure that the yielding anchor is uniformly stressed in the rock mass deformation stage.
The rubber spring in the preferred embodiment is a high-elastic body, and the manufacturing material is common rubber; the elastic modulus of the rubber spring is small, and the rubber spring has larger elastic deformation after being loaded, thereby absorbing impact and vibration and being capable of receiving multidirectional load at the same time; the composite rubber spring is composed of a metal spiral spring and high-quality vulcanized rubber wrapped outside the metal spiral spring; the metal spring and the rubber spring are integrated, the defects of high rigidity, high working noise, small bearing capacity of the rubber spring, poor shape and mechanical property stability and the like of the metal spring are overcome, and the metal spring has the advantages of higher load and deformation, better vibration and noise reduction effect, stable working, short resonance interval and the like. In specific use, the maximum yielding stroke of the rubber spring can be combined with parameters such as geological exploration results of the rock mass, surrounding rock grade, physical properties and the like to adjust the specification size and the elastic modulus of the rubber spring.
The above embodiments are merely illustrative of the preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model, and various modifications and improvements made by those skilled in the art to the technical solution of the present utility model should fall within the protection scope defined by the claims of the present utility model without departing from the design spirit of the present utility model.
Claims (3)
1. An active yielding anchor for a surrounding rock support, comprising:
the rod body is a hollow drill rod with continuous threads on the surface;
the self-drilling bit is arranged at one axial end of the rod body;
the active yielding structure is arranged at the other axial end of the rod body; the active yielding structure comprises a grout stop plug, an anchor backing plate, a yielding backing plate, an elastic piece and a nut which are sequentially sleeved on the rod body.
2. The active yielding anchor rod for surrounding rock support according to claim 1, wherein the rod body is made of high-strength alloy steel, the cross section of the rod body is a hollow circle, the surface of the rod body is a rough-tooth full-thread structure, and the nut can be locked with the thread of the nut in a matching manner.
3. An active yielding anchor for a rock surround according to claim 2, wherein the elastic member is a rubber spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321467938.5U CN220101310U (en) | 2023-06-09 | 2023-06-09 | Active yielding anchor rod for surrounding rock support |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321467938.5U CN220101310U (en) | 2023-06-09 | 2023-06-09 | Active yielding anchor rod for surrounding rock support |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220101310U true CN220101310U (en) | 2023-11-28 |
Family
ID=88847109
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321467938.5U Active CN220101310U (en) | 2023-06-09 | 2023-06-09 | Active yielding anchor rod for surrounding rock support |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220101310U (en) |
-
2023
- 2023-06-09 CN CN202321467938.5U patent/CN220101310U/en active Active
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