Self-drilling type hollow anchor rod with connecting sleeve
By designing a self-drilling hollow anchor with a connecting sleeve, the flexible adjustment of the anchor length is achieved, the problem of high cost of existing anchors is solved, and the anchoring quality and economicality are improved.
Patent Information
- Application Number
- CN202421015914.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-11
- Publication Date
- 2025-03-04
- Estimated Expiration
- 2034-05-11
AI Technical Summary
When used in coal mines, existing self-drilling hollow anchors have high costs due to inflexible lengths, which limits their popularity and application.
A self-drilling hollow anchor with a connecting sleeve is designed, and the length of the anchor is adjusted through the detachment connection between the first anchor rod body and the second anchor rod body. The front end of the anchor body is welded with a drill bit, and the rear end is equipped with a slurry stopper, a pallet and pretighten nut to prevent grouting from overflowing and provide preloading and active support.
The length-adjusted design reduces the manufacturing cost of the anchor, the slurry stop plug prevents the resin slurry from overflowing, and the pallet and pre-tight nuts improve anchor quality.
Smart Images
Figure CN222558575U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of mine support equipment, in particular to a self-drilling hollow anchor rod with a connecting sleeve. Background Art
[0002] Anchor rods are excellent structures for reinforcing underground tunnels and surface rock and soil in coal mines. Anchor support is a reinforcement support method used in surface engineering such as slopes and deep rock and soil foundation pits, as well as underground chambers such as tunnels and mining sites. Rods are made of metal, wood, and polymer parts, and driven into pre-drilled holes in the surface rock or the rock around the chamber. The surrounding rock and the stable rock are combined together by the special structure of the head and rod body and the tail support plate, or by relying on the bonding effect to produce a suspension effect, a composite beam effect, and a reinforcement effect to achieve the purpose of support. It has the advantages of low cost, good support effect, simple operation, flexible use, and less construction clearance.
[0003] As an effective anchoring method, self-drilling hollow anchors have been used in coal mine tunnels in recent years. Pressure grouting of the anchors through the hollow rod body can quickly form support force and control the stability of the surrounding rock. Self-drilling hollow anchors require different lengths of self-drilling hollow anchors according to different working conditions, which increases the cost of anchors. Under the current situation of coal mines using a large number of anchors, the high-cost self-drilling hollow anchors are not conducive to popularization and application in coal mines. Utility Model Content
[0004] The utility model aims to overcome the deficiencies of the prior art and provide a self-drilling hollow anchor rod with a connecting sleeve to solve the technical problems mentioned in the above background technology.
[0005] The purpose of this utility model is achieved through the following technical solutions:
[0006] A self-drilling hollow anchor with a connecting sleeve comprises an anchor body, wherein the anchor body comprises a first anchor rod body and a plurality of second anchor rod bodies arranged in sequence along the length direction of the anchor body; the first anchor rod body and the second anchor rod body and adjacent second anchor rod bodies are all detachably connected via a connecting sleeve; the connecting sleeve, the first anchor rod body and the second anchor rod body are all hollow structures; a drill bit is welded to the end of the first anchor rod body at the front end of the anchor body, and a slurry stop plug is mounted on the outer wall of the second anchor rod body at the rear end of the anchor body, and the slurry stop plug is in a conical structure that is narrow at the front and wide at the rear along the length direction of the anchor body; a support plate mounted on the second anchor rod body is provided at the rear end of the slurry stop plug, and a pre-tightening nut mounted on the second anchor rod body is provided at the rear end of the support plate.
[0007] In the above-mentioned utility model, further, the outer walls of the first anchor rod body and the second anchor rod body are provided with left-handed threads, and the hollow inner wall of the connecting sleeve is provided with right-handed threads. The first anchor rod body and the second anchor rod body are both detachably connected to the connecting sleeve by threaded connection, and the inner cavity walls of the slurry stopper and the pre-tightening nut are both provided with right-handed threads that cooperate with the second anchor rod body.
[0008] In the above utility model, further, the first anchor rod body, the second anchor rod body and the connecting sleeve are all pressed from Q460 high-strength round steel pipe, with a length of 1300mm, an outer diameter of 25mm, an inner diameter of 12mm, a wall thickness of 5mm, a thread tooth height of 1.5mm, and a thread pitch of 10mm.
[0009] In the above utility model, further, the connecting sleeve has a length of 250 mm, an outer diameter of 32 mm, and an inner diameter of 27 mm.
[0010] In the above utility model, further, the diameter of the upper bottom surface of the slurry stopper is 26 mm, the diameter of the lower bottom surface is 60 mm, and the inner diameter of the cavity is 26 mm.
[0011] In the above utility model, further, the support plate has a square shape, a circular cavity in the center, a side length of 120 mm, and a diameter of the circular cavity of 30 mm.
[0012] In the above utility model, further, the cross-section of the pre-tightening nut is hexagonal, the vertical distance between the two parallel sides is 36 mm, and the cavity diameter is 27 mm.
[0013] The beneficial effects of the utility model are:
[0014] The utility model has a first anchor rod body connected to a second anchor rod body through a connecting sleeve to extend the length of the anchor rod body, has the characteristic of adjusting the anchor rod length according to the use conditions, and reduces the manufacturing cost. The grout stopper is installed at the tail end of the second anchor rod body of the anchor rod body to prevent the resin slurry from overflowing from the drill hole during the grouting process. The support plate and the pre-tightening nut cooperate with each other to exert the pre-tightening force and active support, and the anchoring quality is high. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a structural schematic diagram of the utility model;
[0016] Figure 2 yes Figure 1 AA cross-sectional diagram of ;
[0017] Figure 3 yes Figure 1 BB cross-sectional diagram;
[0018] Figure 4 yes Figure 1 Schematic diagram of CC cross section;
[0019] Figure 5 yes Figure 1 DD cross-sectional diagram;
[0020] Figure 6 yes Figure 1 Schematic diagram of EE cross section.
[0021] In the figure, 1-drill bit, 2-first anchor rod body, 3-connecting sleeve, 4-second anchor rod body, 5-slurry stopper, 6-support plate, 7-pre-tightening nut. DETAILED DESCRIPTION
[0022] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.
[0023] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.
[0024] Example:
[0025] A self-drilling hollow anchor with a connecting sleeve, see attached Figure 1 -Attached Figure 6 As shown, it includes an anchor body, and the anchor body includes a first anchor rod body 2 and a plurality of second anchor rod bodies 4 arranged in sequence along the length direction of the anchor body. The first anchor rod body 2 and the second anchor rod body 4 and the adjacent second anchor rod bodies 4 are all detachably connected by a connecting sleeve 3. During use, the purpose of adjusting the length of the anchor body can be achieved by connecting different numbers of second anchor rod bodies 4. A drill bit 1 is welded to the end of the first anchor rod body 2 at the front end of the anchor body, and a grouting stopper 5 is mounted on the outer wall of the second anchor rod body 4 at the rear end of the anchor body. The grouting stopper 5 is a conical structure that is narrow in front and wide in the rear along the length direction of the anchor body; a support plate 6 mounted on the second anchor rod body 4 is provided at the rear end of the support plate 6, and a pre-tightening nut 7 mounted on the second anchor rod body 4 is provided at the rear end of the support plate 6.
[0026] Specifically, the connecting sleeve 3, the first anchor rod body 2 and the second anchor rod body 4 are all hollow structures. The outer walls of the first anchor rod body 2 and the second anchor rod body 4 are provided with left-handed threads, and the hollow inner wall of the connecting sleeve 3 is provided with right-handed threads. The first anchor rod body 2 and the second anchor rod body 4 are both detachably connected to the connecting sleeve 3 by threaded connection, and the inner cavity walls of the grout stopper 5 and the pre-tightening nut 7 are both provided with right-handed threads that cooperate with the second anchor rod body 4.
[0027] In the above embodiment, preferably, the first anchor rod body 2, the second anchor rod body 4 and the connecting sleeve 3 are all pressed from Q460 high-strength round steel pipe, with a length of 1300 mm, an outer diameter of 25 mm, an inner diameter of 12 mm, a wall thickness of 5 mm, a thread profile height of 1.5 mm, and a thread pitch of 10 mm.
[0028] In the above embodiment, preferably, the connecting sleeve 3 has a length of 250 mm, an outer diameter of 32 mm, and an inner diameter of 27 mm.
[0029] In the above embodiment, preferably, the diameter of the upper bottom surface of the slurry stopper 5 is 26 mm, the diameter of the lower bottom surface is 60 mm, and the inner diameter of the cavity is 26 mm.
[0030] In the above embodiment, as a preference, the support plate 6 has a square shape with a circular cavity in the center, a side length of 120 mm, and a diameter of 30 mm.
[0031] In the above embodiment, preferably, the cross section of the pre-tightening nut 7 is hexagonal, the vertical distance between the two parallel sides is 36 mm, and the cavity diameter is 27 mm.
[0032] During use of the utility model, different numbers of second anchor rod bodies 4 are selected according to the use conditions to thread and assemble the anchor body. During drilling, the anchor is delivered through the hollow structure of the connecting sleeve 3, the first anchor rod body 2 and the second anchor rod body 4. The left-handed threads on the first anchor rod body 2 and the second anchor rod body 4 can be used for slag removal during drilling. After drilling is completed, the grouting plug 5 is embedded in the borehole to prevent the anchor resin slurry from overflowing from the borehole during grouting. Finally, the pre-tightening nut 7 is tightened, and the support plate 6 and the pre-tightening nut 7 cooperate with each other to exert pre-tightening force and active support.
[0033] The above-mentioned embodiments only express the specific implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model.
Claims
1. A self-drilling hollow anchor with a connecting sleeve, characterized in that: The invention comprises an anchor body, wherein the anchor body comprises a first anchor rod body and a plurality of second anchor rod bodies which are arranged in sequence along the length direction of the anchor body; the first anchor rod body and the second anchor rod body as well as adjacent second anchor rod bodies are all detachably connected via a connecting sleeve; the connecting sleeve, the first anchor rod body and the second anchor rod body are all hollow structures; a drill bit is welded on the end of the first anchor rod body at the front end of the anchor body, and a slurry stop plug is mounted on the outer wall of the second anchor rod body at the rear end of the anchor body, and the slurry stop plug is in a conical structure which is narrow at the front and wide at the rear along the length direction of the anchor body; a supporting plate which is mounted on the second anchor rod body is provided at the rear end of the slurry stop plug, and a pre-tightening nut which is mounted on the second anchor rod body is provided at the rear end of the supporting plate.
2. A self-drilling hollow anchor with a connecting sleeve according to claim 1, characterized in that: The outer walls of the first anchor rod body and the second anchor rod body are provided with left-handed threads, and the hollow inner wall of the connecting sleeve is provided with right-handed threads. The first anchor rod body and the second anchor rod body are both detachably connected to the connecting sleeve by threaded connection, and the inner cavity walls of the slurry stopper and the pre-tightening nut are provided with right-handed threads that cooperate with the second anchor rod body.
3. A self-drilling hollow anchor with a connecting sleeve according to claim 2, characterized in that: The first anchor rod body, the second anchor rod body and the connecting sleeve are all pressed from Q460 high-strength round steel pipe, with a length of 1300mm, an outer diameter of 25mm, an inner diameter of 12mm, a wall thickness of 5mm, a thread profile height of 1.5mm, and a thread pitch of 10mm.
4. A self-drilling hollow anchor with a connecting sleeve according to claim 3, characterized in that: The connecting sleeve has a length of 250 mm, an outer diameter of 32 mm and an inner diameter of 27 mm.
5. A self-drilling hollow anchor with a connecting sleeve according to claim 3, characterized in that: The diameter of the upper bottom surface of the slurry stopper is 26 mm, the diameter of the lower bottom surface is 60 mm, and the inner diameter of the cavity is 26 mm.
6. A self-drilling hollow anchor with a connecting sleeve according to claim 3, characterized in that: The support plate is square in shape, with a circular cavity in the center, a side length of 120 mm, and a diameter of 30 mm.
7. A self-drilling hollow anchor with a connecting sleeve according to claim 3, characterized in that: The cross section of the pre-tightening nut is hexagonal, the vertical distance between two parallel sides is 36mm, and the cavity diameter is 27mm.