Anchor rod

Abstract

The utility model discloses an anchor rod which comprises a hollow anchor rod body, an anchor rod end, an FRP bullet and a detonating unit. Wherein the anchor rod end head is of a hollow conical structure, the anchor rod end head is arranged at one end of the anchor rod body, a plurality of cracks are formed in the side wall of the anchor rod end head, and the cracks are arranged in the axial direction of the anchor rod end head; the FRP elastic head is arranged in the anchor rod body and is close to one end of the anchor rod end head; the detonating unit comprises a detonator and a blasting fuse which are arranged in the anchor rod body, the detonator is arranged close to the FRP bullet, one end of the blasting fuse is connected with the detonator, the other end of the blasting fuse penetrates out of the anchor rod body, and the FRP bullet can be rushed into the anchor rod end after the detonator is detonated, so that the anchor rod end cracks at the crack and expands; therefore, the anchoring strength of the anchor rod can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of anchor rods, and in particular relates to an anchor rod with reliable anchoring. Background Art

[0002] FRP (Fiberglass Reinforced Plastic) anchors are reinforced anchors made from a mixture of glass fiber and resin, offering high strength. FRP anchors are widely used in mining, tunneling, civil engineering, and underground projects. They are favored for their excellent corrosion resistance, lightweight, high strength, durability, and good elasticity.

[0003] The existing FRP anchor includes an anchor body and an anchor head, wherein the anchor head is an important component of drilling and anchoring force, and the anchor head bears a large tensile force or shear force at the connection part. The anchor head of the existing FRP anchor is generally a solid conical structure.

[0004] Under the stress conditions of drilling and anchoring, the conical structure of the anchor rod with a conical end may produce stress concentration at the top and bottom of the cone, leading to local failure. Therefore, the anchor rod with a conical end is prone to anchor rod prestress attenuation. Especially in soil anchoring, the existing anchor rod is prone to anchor force relaxation, thereby affecting the reliability of anchoring. Utility Model Content

[0005] The utility model aims to provide an anchor rod, which solves the problem that the existing FRP anchor rod is prone to loosening of anchoring force.

[0006] The technical solution adopted by the utility model is an anchor rod, comprising:

[0007] The anchor rod body is a hollow rod body;

[0008] The anchor rod end is a hollow conical structure, and the anchor rod end is arranged at one end of the anchor rod body. A plurality of cracks are arranged on the side wall of the anchor rod end, and the plurality of cracks are arranged along the axial direction of the anchor rod end.

[0009] The FRP bullet is conical in shape and is disposed in the anchor body and close to one end of the anchor end;

[0010] The detonating unit is arranged in the anchor body. The explosive of the detonating unit is industrial explosive. After the detonating unit is detonated, the FRP bullet can be rushed into the interior of the anchor end, thereby causing the anchor end to crack at the crack and expand.

[0011] The outer contour size of the FRP bullet is larger than the inner wall size of the anchor rod end.

[0012] There are four cracks, which are symmetrically distributed along the axis of the anchor rod end, and the ends of the four cracks extend to the tip of the anchor rod end.

[0013] Industrial explosives use emulsion explosives.

[0014] The detonating unit includes explosives, detonators and fuses which are sequentially arranged in the anchor body. The explosives are arranged in the anchor body and one end of the explosives is in contact with the FRP warhead. The detonator is arranged close to the explosives. One end of the fuse is connected to the detonator, and the other end of the fuse passes through the anchor body.

[0015] The explosive is semi-enclosed in the anchor rod body through a copper shell, and both sides of the shell facing the FRP warhead and the detonator are opened.

[0016] A plug is also provided in the anchor body. The FRP bullet, explosives, detonator and fuse are sequentially arranged in a closed space surrounded by the anchor end and the plug. One end of the fuse passes through the plug and then out of the anchor body.

[0017] The plug is fixed inside the anchor body with epoxy resin.

[0018] A conical cavity for accommodating the FRP bullet is arranged at one end of the anchor rod body close to the anchor rod end, and the taper of the conical cavity is the same as that of the FRP bullet.

[0019] The side wall of the anchor rod end is also provided with a plurality of cutting edges, which are respectively arranged between two adjacent cracks, and the plurality of cutting edges are arranged along the axial direction of the anchor rod end.

[0020] The beneficial effects of the utility model are:

[0021] The utility model discloses an anchor rod, which is constructed by embedding an FRP bullet into the end of the anchor rod body and providing a crack on the side wall of the hollow anchor rod end. After the anchor rod is anchored, the industrial explosives in the detonation unit are controlled to explode. The explosives can push the FRP bullet into the interior of the anchor rod end at the moment of explosion. Then, under the impact force of the FRP bullet, the anchor rod end is cracked at the crack and expanded. The expanded anchor rod end can increase the contact area with the surrounding structural rock or soil. The increased contact area can more effectively transmit the anchoring force, thereby improving the anchoring strength of the anchor rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is an overall schematic diagram of an anchor rod of the utility model;

[0023] Figure 2 This is a diagram of the anchoring state of an anchor rod after detonation of the utility model.

[0024] In the figure, 1. anchor rod body, 2. anchor rod end, 3. FRP warhead, 4. detonator, 5. fuse, 6. plug, 7. explosive. DETAILED DESCRIPTION

[0025] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are not intended to limit the protection scheme of the present invention.

[0026] FRP (Fiberglass Reinforced Plastic) anchors are reinforced anchors made from a mixture of glass fiber and resin, offering high strength. FRP anchors are widely used in mining, tunneling, civil engineering, and underground projects. They are favored for their excellent corrosion resistance, lightweight, high strength, durability, and excellent elasticity. FRP anchors consist of an anchor body and an anchor head. The anchor head is a crucial component in drilling and anchoring, bearing significant tensile or shear forces at the connection point.

[0027] The anchor rod end of the existing FRP anchor rod is generally tapered.

[0028] Under the stress conditions of drilling and anchoring, the conical structure of the anchor rod with a conical end may produce stress concentration at the top and bottom of the cone, leading to local failure. Therefore, the anchor rod with a conical end is prone to anchor rod prestress attenuation. Especially in soil anchoring, the existing anchor rod is prone to anchor force relaxation, thereby affecting the reliability of anchoring.

[0029] This kind of anchor rod of the present invention, such as Figure 1-Figure 2 As shown, it includes a hollow anchor body 1, an anchor end 2, an FRP bullet 3 and a detonating unit; the anchor end 2 is a hollow conical structure, the anchor end 2 is arranged at one end of the anchor body 1, and a plurality of cracks are arranged on the side wall of the anchor end 2, and the plurality of cracks are arranged along the axial direction of the anchor end 2; the FRP bullet 3 is conical in shape, the FRP bullet 3 is arranged in the anchor body 1 and close to one end of the anchor end 2, and the FRP bullet 3 is a conical FRP FRP bullet; the detonating unit is arranged in the anchor body 1, and the explosive of the detonating unit is an industrial explosive. After the detonating unit is detonated, the FRP bullet 3 can be rushed into the interior of the anchor end 2, so that the anchor end 2 cracks at the crack and the anchor end 2 expands, thereby improving the anchoring strength of the anchor.

[0030] To ensure that the cracks in the anchor end 2 open the moment the FRP bullet 3 enters the anchor end 2, the outer dimensions of the FRP bullet 3 disclosed in this embodiment are larger than the inner dimensions of the anchor end 2. Therefore, the moment the FRP bullet 3 enters the anchor end 2, the FRP bullet 3 is larger than the inner dimensions of the anchor end 2. As a result, under the compressive action of the FRP bullet 3, the anchor end 2 can open along the cracks, thereby expanding the volume of the anchor end 2. This expansion increases the contact area between the anchor end and the surrounding structural rock or soil. This increased contact area allows for more effective transmission of anchoring force, thereby improving the anchoring strength of the anchor.

[0031] The present embodiment discloses four cracks, which are symmetrically distributed along the axis of the anchor ladder 1. Therefore, when the anchor end 2 is cracked along the four cracks, the anchor end 2 expands evenly along the positions of the four cracks, thereby achieving a better anchoring effect.

[0032] Furthermore, the anchor rod end 2 is a conical structure, and the ends of the four cracks extend to the tip of the anchor rod end 2. At the same time, the four cracks overlap at the tip. Therefore, at the moment when the FRP bullet rushes into the anchor rod end 2, it can ensure that the anchor rod end quickly cracks and expands.

[0033] Furthermore, the detonation unit disclosed in this embodiment includes an explosive 7, a detonator 4, and a fuse 5, which are sequentially arranged within the anchor body 1. The explosive 7 is arranged within the anchor body 1 with one end of the explosive 7 in contact with the FRP bullet 3. The detonator 4 is positioned adjacent to the explosive 7. One end of the fuse 5 is connected to the detonator 4, and the other end of the fuse 5 extends beyond the anchor body 1. Therefore, after the fuse 5 detonates the detonator 4 and the explosive 7, the FRP bullet 3 can be driven into the interior of the anchor end 2.

[0034] The anchor bolt 1 disclosed in this embodiment also includes a plug 6. The FRP bullet 3, explosive 7, detonator 4, and fuse 5 are sequentially arranged within the enclosed space between the anchor bolt end 2 and the plug 6. One end of the fuse 5 passes through the plug 6 and out of the anchor bolt body 1. The plug 6 is simultaneously secured to the interior of the anchor bolt 1 with epoxy resin. Once the plug is secured with epoxy resin, the anchor bolt end 2 and the plug 6 are within the enclosed space, ensuring that the detonator 4 generates sufficient force when it explodes, forcing the FRP bullet 3 into the anchor bolt end 2.

[0035] A conical cavity, designed to house the FRP bullet 3, is located within the anchor body 1 near the end of the anchor tip 2. The conical cavity has the same taper as the FRP bullet 3. The tight fit between the conical FRP bullet and the conical cavity effectively guides the FRP bullet in a predetermined direction during launch or impact, minimizing the possibility of deviation from its trajectory. This ensures that the bullet enters the anchor tip smoothly and causes the anchor tip 2 to crack and expand.

[0036] In order to further improve the anchoring effect of the anchor rod, the side wall of the anchor rod end 2 disclosed in this embodiment is also provided with multiple cutting edges. The multiple cutting edges are respectively arranged between two adjacent cracks, and the cutting edges are arranged along the axial direction of the anchor rod end 2. The number of cutting edges is consistent with the number of splits of the anchor rod end after the explosion, which facilitates cutting the soil during the anchor rod jacking and facilitates the positioning and installation of the anchor rod. At the same time, the expansion of the anchor rod end can squeeze the lateral soil, increase the lateral constraint of the soil on the anchoring end, and improve the soil density. The side cutting edges can coordinate the force to anchor the soil, thereby significantly improving the anchoring force and anchoring reliability of the FPR anchor rod.

[0037] The advantages of the FRP anchor bolt end based on industrial emulsion explosives in this utility model are:

[0038] (1) A conical FRP bullet is introduced into the anchor body, and the expansion of the anchor end is achieved through the propulsion of the conical FRP bullet;

[0039] (2) The explosive 7 in the detonator is made of emulsion explosive, which has stable physical properties, low raw material cost, low forming performance, and moderate explosive power. Reasonable control of the charge amount can ensure that the FRP anchor and the conical FRPFRP warhead are not destroyed;

[0040] (3) The emulsion explosive is semi-enclosed, with the head fitted with the conical FRPFRP warhead and a small hole at the tail to install an electronic detonator for detonating the explosive;

[0041] (4) The detonator and the conical FRP bullet are installed in the center hole of the FRP anchor body. The taper of the center hole of the anchor body is the same as that of the FRP bullet, which ensures the stability of the installation of the emulsion explosive and the conical FRP bullet in the anchor body.

[0042] (5) An FRP plug is added to the rear of the detonator and fixed to the FRP anchor with epoxy resin to offset the recoil of the explosive;

[0043] (6) The conical FRP bullet is made of the same material as the anchor rod, which has good compatibility with the FRP anchor rod and high durability;

[0044] (7) The expansion of the anchor bolt end can squeeze the lateral soil, significantly improving the anchoring force and anchoring reliability of the FPR anchor bolt;

[0045] (8) Reliable anchoring of the anchor rod end can improve the interface shear lag effect of the FRP anchor rod and enhance the anchoring force of the FRP anchor rod.

[0046] The embodiments described above are only preferred specific implementation methods of the present invention, and the protection scope of the present invention is not limited thereto. Any simple changes or equivalent replacements of the technical solutions that can be obviously obtained by any technician familiar with the field within the technical scope disclosed in the present invention fall within the protection scope of the present invention.

Claims

1. An anchor rod, characterized in that: include: The anchor rod body (1) is a hollow rod body; The anchor rod end (2) is a hollow conical structure, the anchor rod end (2) is arranged at one end of the anchor rod body (1), and a plurality of cracks are arranged on the side wall of the anchor rod end (2), and the plurality of cracks are arranged along the axial direction of the anchor rod end (2); An FRP bullet (3), the FRP bullet (3) being conical in shape and being arranged in the anchor rod body (1) and close to one end of the anchor rod end (2); A detonating unit is arranged in the anchor rod body (1). The explosive of the detonating unit is industrial explosive. After the detonating unit is detonated, the FRP bullet (3) can be rushed into the interior of the anchor rod end (2), thereby causing the anchor rod end (2) to crack at the crack and causing the anchor rod end (2) to expand.

2. An anchor rod according to claim 1, characterized in that: The outer contour size of the FRP bullet (3) is larger than the inner wall size of the anchor rod end (2).

3. An anchor rod according to claim 1, characterized in that: There are four cracks, which are symmetrically distributed along the axis of the anchor rod end (2), and the ends of the four cracks extend to the tip of the anchor rod end (2).

4. An anchor rod according to claim 1, characterized in that: The industrial explosive is emulsion explosive.

5. The anchor rod according to claim 1, characterized in that: The detonation unit comprises an explosive (7), a detonator (4) and a fuse (5) which are sequentially arranged in the anchor rod body (1); the explosive (7) is arranged in the anchor rod body (1) and one end of the explosive (7) is in contact with the FRP warhead (3); the detonator (4) is arranged close to the explosive (7); one end of the fuse (5) is connected to the detonator (4); and the other end of the fuse (5) passes through the anchor rod body (1).

6. An anchor rod according to claim 5, characterized in that: The explosive (7) is semi-enclosed in the anchor rod body (1) through a copper shell, and both sides of the shell facing the FRP warhead (3) and the detonator (4) are opened.

7. An anchor rod according to claim 5, characterized in that: A plug (6) is also provided in the anchor rod body (1); the FRP bullet (3), explosive (7), detonator (4) and fuse (5) are sequentially arranged in a closed space surrounded by the anchor rod end (2) and the plug (6); one end of the fuse (5) passes through the plug (6) and then out of the anchor rod body (1).

8. An anchor rod according to claim 7, characterized in that: The plug (6) is fixed inside the anchor rod body (1) by epoxy resin.

9. The anchor rod according to claim 1, characterized in that: A conical cavity for accommodating the FRP bullet (3) is provided inside the anchor rod body (1) at one end close to the anchor rod end head (2), and the taper of the conical cavity is the same as that of the FRP bullet (3).

10. The anchor rod according to claim 1, characterized in that: A plurality of cutting edges are also provided on the side wall of the anchor rod end (2), and the plurality of cutting edges are respectively provided between two adjacent cracks, and the plurality of cutting edges are provided along the axial direction of the anchor rod end (2).

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