Novel expansion grouting anchor rod

Abstract

The utility model relates to a novel expansion grouting anchor rod which comprises a rod body, an expansion rod sleeve, a grouting hole, a grout outlet hole, a communicating pipe and a grouting channel. A protruding structure is arranged on the rod body and serves as a bearing part, a seam is formed in the expansion rod sleeve of the bearing part in the axial direction, and the seam part can be opened along with upward movement of the expansion rod sleeve along the rod body. The grouting hole is formed in the cavity in the bottom end of the rod body, and second grout outlet holes are formed in the periphery of the expansion rod sleeve and communicated with the cavity of the rod body through a communicating pipe. The expansion grouting anchor rod is characterized in that when the expansion grouting anchor rod is installed, a rod sleeve on the periphery of a rod body is moved, so that an open seam of the expansion rod sleeve is opened, the size of a protruding part on the upper portion of the rod body is increased, the protruding part and surrounding rock are fully extruded to form lateral friction resistance, and a rock-soil body gap and a contact gap between the rod body and the rock-soil body are filled through grouting; and full-length anchoring is achieved through grouting, the anchoring force is large, and the anchoring effect is good. The anchor rod is ingenious in design, safe and practical, and the anchoring problem of the anchor rod is well solved.

Description

Technical Field

[0001] The utility model relates to the technical field of anchor support for coal mine lanes, tunnels and the like, in particular to a novel expansion grouting anchor. Background Art

[0002] Anchor rods are anchoring systems that transfer tension to stable rock layers or soil. They are used in geotechnical engineering to reinforce broken rock, loose rock or sliding rock, thereby increasing the bearing capacity and stability of the rock. Various anchor rods used in mine tunnels, road tunnels, and water conservancy culverts mainly play the role of combined arches, combined beams, and suspensions to support and reinforce the surrounding rock, thereby increasing the strength of the surrounding rock to withstand pressure. It is an active support form. As an effective tunnel support method, anchor rod support can significantly improve tunnel support, enhance the stability of surrounding rock, and reduce tunnel deformation. Therefore, anchor rod support has become a major support method for tunnel support.

[0003] During the anchoring process of traditional expansion anchors, the expansion contact area between the expansion anchor and the surrounding rock is small, and the full-length grouting anchoring effect cannot be achieved. The limited friction force generated on the contact surface between the anchor and the anchor body cannot support the deformation of the surrounding rock mass, which can easily cause the anchor to slip, thereby making the anchor failure. The anchoring effect of the anchor cannot be effectively exerted, causing hazards such as tunnel deformation, and the practicality is poor.

[0004] Therefore, it is necessary to improve the existing expansion anchor rod so that it has an expansion grouting anchoring structure. While it is expanding and anchoring, grouting is injected into other areas outside the expansion area of ​​the anchor rod, and the grouting is uniform to achieve the effect of full-length anchoring. Utility Model Content

[0005] The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide a new expansion grouting anchor rod with reliable fixation and full-length anchoring.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a new type of expansion grouting anchor rod is composed of a rod body, a nut, a grouting hole, a rod sleeve, and a pad. There is a grouting hole at the raised part of the rod body, which is connected to the central grouting channel in the rod body, and a grouting port is provided at the bottom end of the rod body.

[0007] The utility model has evenly opened slits on the rod sleeve to expand with the rod body. A grout outlet hole is provided on the upper part of the rod body, so that the grout can fully fill the cracks in the surrounding rock, increase the integrity of the surrounding rock, reduce the deformation of the surrounding rock, and thus increase the expansion force of the anchor rod on the surrounding rock.

[0008] A hole is opened on the rod sleeve to expand the grouting area, achieve full-length anchoring, and increase its anchoring capacity. The upper part of the rod body is a convex structure, so that when the expansion rod sleeve moves forward, the rod body gradually squeezes the upper part of the expansion rod sleeve, so that the axial slit gap gradually becomes larger, and the upper part of the rod sleeve expands outward until it is close to the borehole wall, increasing the friction between the anchor rod and the hole wall.

[0009] The lower part of the rod body is respectively provided with a push nut, a pad and a fixing nut from top to bottom.

[0010] The beneficial effects of the utility model are as follows: as a new type of expansion grouting anchor rod, it realizes expansion first and then grouting during the construction process, effectively increasing the friction between the anchor rod and the surrounding rock, further improving the anchoring force of the anchor rod, and staggering the grouting outlets outside the expansion area of ​​the rod body to make the grouting more uniform, so that other areas outside the expansion area of ​​the anchor rod can be fully adhered to the surrounding rock, thereby achieving the effect of full-length anchoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structural section of the utility model;

[0012] Figure 2 It is a cross-sectional schematic diagram of the structure of the utility model when working;

[0013] Figure 3 This is a schematic diagram of the anchor rod of the utility model;

[0014] Figure 4 It is a schematic diagram of the anchor rod of the utility model when working;

[0015] Figure 5 It is a plan view of the bottom end of the rod body of the utility model;

[0016] Figure 6 It is a schematic diagram of the connecting pipe of the utility model.

[0017] like Figures 1 to 6 As shown, the utility model mainly includes an anchor rod body 1, an expansion rod sleeve 2, a grouting hole 3, a grouting hole 1 4-1, a grouting hole 2 4-2, an axial slit 5, a fixing nut 6, a pad 7, an inclined portion 8, a rod body raised portion 9, a connecting pipe 10, an expansion combination portion 11, a grouting channel 12, a push nut 13, and a rod sleeve raised platform 14. DETAILED DESCRIPTION

[0018] See also Figures 1 to 6The expansion grouting anchor rod of the utility model comprises a rod body 1 and an expansion rod sleeve 2. A convex portion is provided along the axial direction of the upper part of the rod body 1. The expansion rod sleeve 2 is provided with a bearing portion that cooperates with the convex portion. A push nut 13 is provided at the lower end of the rod body 1. The push nut 13 is rotated, and the nut 13 moves the expansion rod sleeve 2 upward through the rod sleeve convex platform 14. The bearing portion is provided with an axial slit 5. The axial slit 5 can be radially opened with the axial movement of the expansion rod sleeve. When it moves to a certain distance, the connecting pipe 10 is connected with the slurry outlet hole 4-2 on the expansion rod sleeve 2, so as to achieve grouting. The purpose of grouting; there are nuts 6 and pads 7 at the bottom of the rod body, which can be fixed in the rock mass by the nuts 6, and the pads 7 and nuts 6 can be set as a connected structure; the grouting hole 3 is arranged at the bottom cavity of the rod body 1, and the grouting hole 1 4-1 is arranged around the raised part of the rod body and connected with the cavity, and a grouting hole 2 4-2 is also arranged around the expansion rod sleeve 2 and connected with the cavity of the rod body 1 through a connecting pipe 10; grouting is carried out through the grouting hole 3 at the bottom end of the rod body 1, and the slurry is transported to other areas outside the expansion area through the grouting channel 12, the connecting pipe 10 and the grouting hole 2 4-2, so as to achieve the effect of full-length anchoring.

[0019] The rod body 1 and the expansion rod sleeve 2 are both columnar; the expansion rod sleeve 2 has a certain thickness, so it has an outer wall and an inner wall, and correspondingly also has an outer diameter and an inner diameter; the axial slit 5 is an opening formed by cutting along the axial direction of the expansion rod sleeve 2, and of course its length needs to take into account actual needs and the material of the expansion rod sleeve 2; the protruding structure cooperates with the bearing part, which means that the protruding structure and the bearing part constitute an expansion area, and the bearing part is separated by the axial slit 5 and has radial elasticity. When the protruding structure moves axially, it will squeeze the corresponding bearing part, push the bearing part to open radially and form friction resistance with the surrounding rock; the slurry outlet hole 4-1 is at the protruding part 9 of the rod member and around the expansion rod sleeve 2, evenly distributed around the protruding part of the rod body 1 and the expansion rod sleeve 2, and is connected to the grouting channel 12; the slurry passes through the inner cavity of the rod body 1 from the slurry outlet hole 4-1 into the gaps in the rock and soil body and the contact gap between the rod body and the rock and soil body, so that the rock and soil body and the rod body form an integral structure, which greatly enhances the tensile strength and support effect. It ensures that when the surrounding rock is deformed due to factors such as tectonic stress, the expansion anchor rod can still play an anchoring role.

[0020] Grouting is carried out from the grouting hole 3 at the bottom end of the rod body 1, and reaches the upper raised structure of the rod body 1 along the central grouting channel 12 of the rod body 1. The diameter of the grouting channel at the raised structure is increased to ensure that the slurry can flow out smoothly, reach the slurry outlet hole 4-1, and flow out from the slurry outlet hole 4-1 evenly without being easily blocked.

[0021] The expansion rod sleeve 2 moves upward, generates radial force along the bearing portion, and expands radially to contact the surrounding rock to increase friction resistance.

[0022] In this embodiment, an inclined portion 8 is provided to match the generatrix of the protruding structure; the consistency of the inclination makes the protruding structure move more smoothly and has a better expansion performance.

[0023] In this embodiment, there are multiple axial slits 5, which are evenly arranged around the expansion rod sleeve 2; Figure 3 As shown, the axial slit 5 divides the bearing part into a plurality of bearing blocks.

[0024] In this embodiment, the rod body 1 and the protruding structure are integrally formed, which makes the structure more stable and simplifies the production process. The pulp outlet holes 1-4-1 are distributed at intervals, which can better improve the pulp outlet speed.

[0025] The connecting pipes 10 are arranged symmetrically and staggered along the 90° direction to facilitate uniform slurry discharge. After the expansion rod sleeve 2 moves upward to a specified distance, the slurry discharge hole 4-2 on the expansion rod sleeve 2 is connected to the connecting pipe 10, and the slurry flows out from the slurry discharge hole 4-2 through the connecting pipe.

[0026] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any reference numerals in the claims should not be regarded as limiting the claims involved.

[0027] In addition, it should be understood that although the present specification is described in accordance with implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form a person skilled in the art.

Claims

1. A novel expansion grouting anchor rod, comprising a rod body (1), an expansion rod sleeve (2), a grouting hole (3), a grouting hole 1 (4-1), a grouting hole 2 (4-2) and a connecting pipe (10), characterized in that: A raised portion (9) is provided along the axial direction of the rod body (1); a raised structure is provided on the rod body (1) as a bearing portion; a slit (5) is provided along the axial direction on the expansion rod sleeve of the bearing portion; the slit portion can be opened as the expansion rod sleeve (2) moves upward along the rod body (1); the grouting hole (3) is provided at the bottom cavity of the rod body (1); a slurry outlet hole (4-1) is provided around the raised portion of the rod body and communicates with the cavity; and a slurry outlet hole (4-2) is also provided around the expansion rod sleeve (2) and communicates with the cavity of the rod body (1) through a connecting pipe (10).

2. The expansion grouting anchor rod according to claim 1, characterized in that: The raised portion (9) is a raised structure at the top end of the rod body (1), and the bearing portion is an expansion assembly portion (11) formed by the matched raised portion (9) and the axial slit (5) on the expansion rod sleeve (2).

3. The expansion grouting anchor rod according to claim 1, characterized in that: There are a plurality of axial slits (5) which are evenly arranged around the expansion rod sleeve (2); the rod body (1) and the raised portion (9) are integrally formed; the expansion rod sleeve (2) and the axial slits (5) are integrally formed; and the grouting hole (3) is located at the bottom end of the rod body (1).

4. The expansion grouting anchor rod according to claim 1, characterized in that: The grouting holes (4-1) are located at the convex part (9) of the rod member and around the expansion rod sleeve (2), and are evenly distributed around the convex part of the rod body (1) and the expansion rod sleeve (2) and are connected to the grouting channel (12).

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