Low-prestress hollow anchor rod

Abstract

The utility model provides a low-prestress hollow anchor rod, and mainly relates to the technical field of anchor rod fixing. The low-prestress hollow anchor rod comprises an anchor rod body and a hollow rod body, one end of the anchor rod body is coaxially connected with the hollow rod body through a connecting sleeve, an anchor head is fixedly arranged at the other end of the hollow rod body, blades are symmetrically hinged to the outer ring of the anchor head, an anchoring agent cartridge is arranged in the hollow rod body, and a piston is arranged at the position, close to the anchor rod, in the hollow rod body. The anchor head has the advantages that the anchor head stirs the anchoring agent in the hole channel in the rotating process, the phenomena of bias flow and aggregation of the anchoring agent caused by gravity are effectively avoided, and it is guaranteed that the anchoring agent evenly fills the whole hole space; the blades are arranged in an arc shape and matched with the elastic pieces, it is guaranteed that the blades are always in an open state in the tensioning process, the step faces on the outer sides of the blades make close contact with the hole wall, the friction force between the blades and the hole wall is increased, and stable and reliable temporary anchoring force is provided for the anchor rod before an anchoring agent is solidified.

Description

Technical Field

[0001] This utility model mainly relates to the field of anchor bolt fixing technology, specifically a low-prestress hollow anchor bolt. Background Technology

[0002] In geotechnical engineering, such as tunnel excavation, slope protection, and mining, anchor bolt support is a crucial means of ensuring project stability. When traditional anchor bolts are installed in holes with large elevation angles, gravity makes it difficult for the bolts to remain stably in their intended positions within the hole. Especially in the initial stage before the anchoring agent has solidified, the anchor bolts are prone to slippage, severely impacting construction efficiency and progress. Simultaneously, poor mixing of the anchoring agent by the anchor head results in uneven distribution of the anchoring agent within the hole, failing to fully exert its bonding and anchoring effect and reducing the anchoring strength between the anchor bolt and the rock mass. To address these problems, this application provides a low-prestress hollow anchor bolt. Utility Model Content

[0003] To achieve the above objectives, this utility model employs the following technical solution:

[0004] A low-prestress hollow anchor bolt includes an anchor bolt and a hollow rod body. One end of the anchor bolt is coaxially connected to the hollow rod body via a connecting sleeve. An anchor head is fixedly installed at the other end of the hollow rod body. The outer ring of the anchor head is symmetrically hinged with blades. An anchoring agent cartridge is installed inside the hollow rod body. A piston is installed inside the hollow rod body near the anchor bolt.

[0005] The anchor head has a groove inside, and chemical holes are symmetrically formed on the anchor head. The chemical holes are located at the bottom of the blade, and a stepped surface is formed on the outer side of the blade near the end. The blade is arc-shaped.

[0006] The piston is symmetrically fixed with spikes on one side near the anchoring agent cartridge, and the other side of the anchoring agent cartridge abuts against the end of the anchor rod.

[0007] The other end of the anchor rod is connected in sequence to a grout stop plug, an anchor plate, and a locking nut.

[0008] Compared with the existing technology, the beneficial effects of this utility model are:

[0009] This invention features a simple structure, facilitating installation and use. During rotation, the anchor head stirs the anchoring agent within the duct, effectively preventing flow deviation and aggregation caused by gravity, ensuring the agent evenly and fully fills the entire cavity. The arc-shaped blades, combined with elastic elements, ensure the anchor remains in an open state during tensioning. The stepped surface on the outer side of the blades is in close contact with the borehole wall, increasing friction and providing a stable and reliable temporary anchoring force before the anchoring agent solidifies. The prestress can be flexibly adjusted by rotating the locking nut, allowing the anchor to better adapt to anchoring requirements under different geological conditions. Attached Figure Description

[0010] Appendix Figure 1 This is a cross-sectional structural schematic diagram of the present invention;

[0011] Appendix Figure 2 This is a schematic diagram of the anchor head structure of this utility model.

[0012] The following are the labels in the attached diagram: 1. Anchor bolt; 2. Hollow rod body; 3. Connecting sleeve; 4. Anchor head; 5. Blade; 6. Anchoring agent cartridge; 7. Piston; 8. Agent hole; 9. Grout stop plug; 10. Anchor plate; 11. Locking nut. Detailed Implementation

[0013] The present invention will be further described in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the present invention, and these equivalent forms also fall within the scope defined in this application.

[0014] Referring to the accompanying drawings, a low-prestress hollow anchor bolt includes an anchor bolt 1 and a hollow rod body 2. One end of the anchor bolt 1 is coaxially connected to the hollow rod body 2 via a connecting sleeve 3. The connecting sleeve 3 is coaxially threadedly connected to the anchor bolt 1 and the hollow rod body 2. An anchor head 4 is fixedly installed at the other end of the hollow rod body 2. The outer ring of the anchor head 4 is symmetrically hinged with blades 5. An anchoring agent cartridge 6 is installed inside the hollow rod body 2. A piston 7 is installed inside the hollow rod body 2 near the anchor bolt 1.

[0015] The anchor head 4 has a groove inside, and symmetrical chemical holes 8 are formed on the anchor head 4. The chemical holes 8 are located at the bottom of the blade 5. The outer side of the blade 5 has a stepped surface near the end. This structural design increases the friction between the blade 5 and the hole in the shelter. The blade 5 is arc-shaped. In order to ensure that the blade 5 is always in an open state during the backward tensioning process, an elastic element is connected to the inner wall of the blade 5. The elastic element can be connected to the blade 5 at one end and to the anchor head 4 at the other end. The elastic element can be a helical spring, a leaf spring, an air spring, or a rubber spring.

[0016] The piston 7 is symmetrically fixed with spikes on one side near the anchoring agent cartridge 6. This structural design pierces the outer skin of the anchoring agent cartridge 6, and the other side of the anchoring agent cartridge 6 abuts against the end of the anchor rod 1.

[0017] The other end of the anchor rod 1 is sequentially connected to a grout stop plug 9, an anchor plate 10, and a locking nut 11. The locking nut 11 is threaded to the anchor rod 1. The grout stop plug 9 abuts against the anchor plate 10 to prevent grout from flowing out. The locking nut 11 abuts against the other side of the anchor plate 10. The force-bearing area can be changed by rotating the locking nut 11.

[0018] When using this device, after drilling holes in the rock mass as required, the device is assembled and pressed to the bottom of the duct. One end of the anchor head 4 is first inserted into the duct, and then the anchor rod 1 is rotated to drive the piston 7 forward. This causes the spikes on the piston 7 to cut open the outer skin of the anchoring agent cartridge 6. As the piston 7 continues to move forward, the anchoring agent is squeezed out through the agent hole 8. After the blade 5 opens, it has a certain anchoring effect on the inner wall of the borehole through the step surface. Before the anchoring agent solidifies, it can effectively prevent the anchor rod 1 from falling off. As the anchor head 4 rotates, it stirs the anchoring agent in the duct to ensure the mixing effect.

[0019] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A low prestressed hollow anchor rod comprising an anchor rod (1), a hollow shaft (2), characterized in that: The anchor rod (1) is coaxially connected with the hollow rod body (2) through the connecting sleeve (3) at one end, the other end of the hollow rod body (2) is fixedly provided with the anchor head (4), the outer ring of the anchor head (4) is symmetrically hinged with the blade (5), the inside of the hollow rod body (2) is provided with the anchoring agent cartridge (6), and the inside of the hollow rod body (2) is provided with the piston (7) close to the position of the anchor rod (1).

2. A low prestressed hollow anchor rod as claimed in claim 1, characterized in that: The anchor head (4) is internally provided with a groove, the anchor head (4) is symmetrically provided with the medicament holes (8), the medicament holes (8) are located at the bottom of the blade (5), the outer side of the blade (5) is provided with a stepped surface close to the end, and the blade (5) is arranged in an arc shape.

3. A low prestressed hollow anchor rod as claimed in claim 1, wherein: The piston (7) is symmetrically fixedly provided with the sharp on one side close to the anchoring agent cartridge (6), and the other side of the anchoring agent cartridge (6) abuts against the end of the anchor rod (1).

4. A low prestressed hollow anchor rod as claimed in claim 1, wherein: The other end of the anchor rod (1) is sequentially connected with the stop plug (9), the anchor pad (10) and the anchor locking nut (11).

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