Expandable grouting anchor rod for tunnel construction

Abstract

The utility model relates to grouting anchor rod technical field discloses a kind of expandable grouting anchor rods for tunnel construction, comprising: anchor rod body, hollow setting and two ends are set grouting mouth and cone head respectively;Expansion part, setting in the one end of anchor rod body close to cone head, and expansion part is set in anchor wing, anchor wing is unfolded outside anchor rod body;Grouting part, setting between the grouting mouth and expansion part of anchor rod body, grouting part is evenly distributed with grout hole on it.The utility model sets up independent expansion part in the terminal of anchor rod body, and anchor force is enhanced by unfoldable anchor wing, to reduce the structural coupling between expansion part and grouting part as far as possible, reduce construction difficulty, while guarantee the grout hole quantity on grouting part, make slurry even into anchor hole and soil layer, compatible with the advantages of adhesive type anchoring and mechanical type anchoring, improve anchoring effect.

Description

Technical Field

[0001] This utility model relates to the field of grouting anchor technology, and more specifically, to an expandable grouting anchor for tunnel construction. Background Technology

[0002] During tunnel construction, anchor bolts are required for fixation. Current technologies primarily employ two methods: mechanical anchoring and adhesive anchoring. Mechanical anchoring utilizes the friction or support force generated by mechanical components against the borehole wall or the tail of the bolt to provide anchoring force; examples include expansion-shell anchor bolts and wedge-type anchor bolts. Adhesive anchoring uses injected bonding materials (such as cement grout or resin anchoring agents) to bond the anchor bolt body to the borehole soil, transferring load through the adhesive force; examples include grouting anchor bolts.

[0003] In the prior art, such as Chinese Patent Publication No. CN220336931U, a grouting anchor bolt device for tunnel construction is disclosed. Multiple anchor bolt holes are provided axially on the pipe wall of the anchor bolt body. An anchor bolt is screwed into each anchor bolt hole. One end of the anchor bolt has a pointed tip, and the other end has an anchor bevel gear. By rotating the anchor bevel gear, the anchor bolt passes through the anchor bolt body and is anchored in the stratum. A grout outlet hole is provided on the anchor bolt body corresponding to the anchor bolt hole. This anchor bolt device uses a combination of mechanical and adhesive anchoring, solving the problem of poor anchoring effect in existing hollow grouting anchor bolts.

[0004] However, this device has the following problems: when the screw drives the anchor pin to unfold and move the bevel gear outward, a small deviation can cause interference with the anchor pin bevel gear; the initial extension length of the anchor pin is not easy to control, which puts forward strict requirements on assembly and construction; the anchor pin occupies the position of the grout outlet hole, resulting in poor grout output and grout uniformity, which affects the anchoring effect.

[0005] Therefore, it is necessary to propose an expandable grouting anchor for tunnel construction to at least partially solve the problems existing in the prior art. Utility Model Content

[0006] To address the aforementioned problems, this utility model discloses an expandable grouting anchor bolt for tunnel construction, comprising: The anchor bolt body is hollow and has a grouting port and a cone at each end; An expansion section is provided at one end of the anchor bolt body near the cone head, and an anchoring wing is provided inside the expansion section, which extends outward from the outside of the anchor bolt body. The grouting section is located between the grouting port and the expansion section of the anchor bolt body, and grout outlet holes are evenly distributed on the grouting section.

[0007] Preferably, a partition is provided between the expansion section and the grouting section, and the partition is slidably connected to the inner wall of the cavity of the anchor bolt body.

[0008] Preferably, the expansion portion includes: The base is located inside the anchor bolt body cavity and connected to the cone head; The elastic telescopic rod is connected to the side of the base body near the grouting part; The drive board is connected to the telescopic end of the elastic telescopic rod; The connecting rod is hinged at one end to the edge of the drive plate and extends out of the anchor rod body at the other end. The two ends of the anchoring wing are respectively hinged to the connecting rod and the seat.

[0009] Preferably, a first magnetic plate and a second magnetic plate with the same magnetic properties are respectively provided on the opposite side of the partition and the drive plate, and there is a gap between the two under the action of magnetic force.

[0010] Preferably, multiple anchoring wings are evenly arranged along the circumference of the anchor rod body, and multiple connecting rods are evenly arranged along the circumference of the drive plate, with each connecting rod corresponding to one of the anchoring wings.

[0011] Preferably, the side wall of the anchor bolt body is provided with a side groove for the connecting rod and the anchoring wing to pass through, and the anchoring wing is partially or completely housed in the side groove.

[0012] Preferably, the outer side of the anchoring wing is provided with several anti-slip tips.

[0013] Preferably, the expandable grouting anchor for tunnel construction further includes a pressure rod, which extends from the grouting port of the anchor body and presses against the partition plate.

[0014] Preferably, the cone head is provided with a cavity structure and its outer wall is provided with multiple cone head grout outlet holes. A grout guide pipe is provided in the anchor rod body. One end of the grout guide pipe is connected to the cone head, and the other end extends through the partition to the grouting part.

[0015] Preferably, the inner wall of the anchor bolt body is provided with a protrusion for limiting the position of the partition.

[0016] Compared with the prior art, the expandable grouting anchor bolt for tunnel construction provided by this utility model has at least the following beneficial effects: an independent expansion section is set at the end of the anchor bolt body, the anchoring force is enhanced by the expandable anchoring wings, the structural coupling between the expansion section and the grouting section is reduced as much as possible, the construction difficulty is reduced, and the number of grout outlet holes on the grouting section is guaranteed, so that the grout enters the anchoring hole and the soil layer evenly. It combines the advantages of adhesive anchoring and mechanical anchoring and improves the anchoring effect.

[0017] The expandable grouting anchor bolt for tunnel construction described in this utility model has other advantages, objectives and features that will be partly apparent from the following description, and partly understood by those skilled in the art through research and practice of this utility model. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a three-dimensional structural schematic diagram of an expandable grouting anchor bolt for tunnel construction according to the present invention; Figure 2 This is a cross-sectional structural diagram of the anchor bolt body of this utility model (anchor wing retracted). Figure 3 This is a cross-sectional structural diagram of the anchor bolt body of this utility model (anchor wing deployed). Figure 4 This is a schematic diagram of the grouting section in this utility model.

[0020] In the diagram: 1. Anchor bolt body; 2. Grouting port; 3. Cone head; 4. Anchoring wing; 5. Grout outlet hole; 6. Partition plate; 10. Expansion section; 20. Grouting section; 11. Seat; 12. Drive plate; 13. Connecting rod; 14. First magnetic plate; 15. Second magnetic plate; 16. Elastic telescopic rod; 17. Side groove; 18. Anti-slip tip; 19. Pressure rod; 21. Cone head grout outlet hole; 22. Grout guide pipe; 23. Protrusion. Detailed Implementation

[0021] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0022] Example: Figures 1-4 As shown in the figure, this embodiment provides an expandable grouting anchor for tunnel construction, comprising: The anchor bolt body 1 is hollow and has a grouting port 2 and a cone head 3 at each end; An expansion section 10 is provided at one end of the anchor bolt body 1 near the cone head 3, and an anchoring wing 4 is provided inside the expansion section, with the anchoring wing 4 extending outward from the outside of the anchor bolt body 1. The grouting section 20 is located between the grouting port 2 and the expansion section 10 of the anchor body 1, and the grouting section 20 has grout outlet holes 5 evenly distributed on it.

[0023] The working principle and beneficial effects of this utility model are as follows: This embodiment provides an expandable grouting anchor for tunnel construction. During tunnel anchoring, an anchoring hole is drilled inside the tunnel, and the anchor body 1 is inserted into the anchoring hole. The end of the anchor body 1 is designed with a cone for easy insertion. An independent expansion section 10 is provided at the end of the anchor body 1, and a mechanically expandable anchoring wing 4 is provided inside the expansion section 10. By applying pressure to the expansion section 10, the anchoring wing 4 is unfolded and anchored in the soil layer, enhancing the anchoring force of the anchor. Then, grout is injected into the grouting section 20. The grout flows out from the grout outlet 5 and solidifies, bonding the anchor to the anchoring hole.

[0024] Through the above structural design, an independent expansion section 10 is set at the end of the anchor body 1. The anchoring force is enhanced by the deployable anchoring wing 4. The structural coupling between the expansion section 10 and the grouting section 20 is reduced as much as possible, reducing the construction difficulty. At the same time, the number of grout outlet holes 5 on the grouting section 20 is guaranteed, so that the grout enters the anchoring hole and the soil layer evenly. It combines the advantages of adhesive anchoring and mechanical anchoring and improves the anchoring effect.

[0025] In one embodiment, a partition 6 is provided between the expansion section 10 and the grouting section 20, and the partition 6 is slidably connected to the inner wall of the cavity of the anchor body 1.

[0026] The working principle and beneficial effects of the above technical solution are as follows: The expansion section 10 and the grouting section 20 are separated by a partition 6, which solves the problem of grout entering the expansion section 10 and flowing out from the side groove 17 during the grouting process, and ensures that the grout flow rate and pressure are within a controllable range.

[0027] In one embodiment, the expansion portion 10 includes: The seat 11 is located inside the cavity of the anchor bolt body 1 and is connected to the cone head 3; The elastic telescopic rod 16 is connected to the side of the base 11 near the grouting part 20; The drive plate 12 is connected to the telescopic end of the elastic telescopic rod 16; The connecting rod 13 is hinged at one end to the edge of the drive plate 12 and extends out of the anchor rod body 1 at the other end. The two ends of the anchoring wing 4 are respectively hinged to the connecting rod 13 and the seat 11.

[0028] On the opposite side of the partition 6 and the drive plate 12, there are a first magnetic plate 14 and a second magnetic plate 15 with the same magnetic properties, and there is a gap between them under the action of magnetic force.

[0029] The expandable grouting anchor bolt for tunnel construction also includes a pressure rod 19, which extends from the grouting port 2 of the anchor bolt body 1 and presses against the partition plate 6.

[0030] The working principle and beneficial effects of the above technical solution are as follows: When the anchoring wing 4 is deployed, the pressure rod 19 extends into the grouting port 2 of the anchor body 1. The outer end of the pressure rod 19 is connected to a power source, such as a hydraulic cylinder, and the inner section of the pressure rod 19 abuts against the partition plate 6. There is a repulsive force between the first magnetic plate 14 on the partition plate 6 and the second magnetic plate 15 on the drive plate 12, which in turn pushes the drive plate 12 to move towards the cone head 3 and overcomes the elastic force of the elastic telescopic rod 16. The drive plate 12 pushes the end of the anchoring wing 4 upward through the connecting rod 13 to deploy it, forming an umbrella-shaped structure and anchoring it in the soil layer. After the anchoring wing 4 is deployed, the pressure rod 19 is removed, and grout is injected into the grouting part 20. As the grout pressure increases, it squeezes the partition plate 6, further reinforcing the deployment of the anchoring wing 4 and increasing its stability.

[0031] The elastic force of the elastic telescopic rod 16 keeps the drive plate 12 moving toward the grouting port 2. When not squeezed by the pressure rod 19, the anchoring wing 4 can be retracted to both sides of the anchor body 1, reducing the resistance of the anchor body 1 entering the anchoring hole. Moreover, the elastic force is too small to overcome the soil resistance and automatically pull out the anchoring wing 4 after anchoring.

[0032] Driven by magnetic force, the mechanical structure coupling is reduced, which can reduce the risk of structural jamming when the pressure bar 19 is tilted or there is a large difference in pressure between the upper and lower soil layers, and reduce the difficulty of operation.

[0033] In one embodiment, multiple anchoring wings 4 are evenly arranged along the circumference of the anchor body 1, and multiple connecting rods 13 are evenly arranged along the circumference of the drive plate 12, with each connecting rod 13 corresponding to one of the anchoring wings 4.

[0034] The side wall of the anchor body 1 is provided with a side groove 17 for the connecting rod 13 and the anchoring wing 4 to pass through, and the anchoring wing 4 is partially or completely housed in the side groove 17.

[0035] The working principle and beneficial effects of the above technical solution are as follows: Multiple evenly arranged anchoring wings 4 help ensure that the anchoring force around the anchor body 1 is similar. The anchoring wings 4 can be partially or completely housed on both sides of the anchor body 1, reducing the exposed size of the anchoring wings 4 and reducing the resistance of the anchor body 1 entering the anchoring hole.

[0036] In one embodiment, the outer surface of the anchoring wing 4 is provided with a plurality of anti-slip tips 18. The anti-slip tips 18 are inserted into the soil layer to further improve the anchoring effect.

[0037] In one embodiment, the cone head 3 is provided with a cavity structure and a plurality of cone head grout outlet holes 21 are arranged on its outer wall. A grout guide pipe 22 is provided inside the anchor bolt body 1. One end of the grout guide pipe 22 is connected to the cone head 3, and the other end extends through the partition plate 6 into the grouting part 20.

[0038] The inner wall of the anchor bolt body 1 is provided with a protrusion 23 for limiting the position of the partition plate 6.

[0039] The working principle and beneficial effects of the above technical solution are as follows: To ensure the anchoring effect at the end of the anchor body 1, the cone head 3 can be made into a hollow structure with a grout outlet 21. Grout enters the cavity of the cone head 3 through the grout guide pipe 22 and then flows out through the grout outlet 21, bonding and anchoring the cone head 3 to the soil layer. A protrusion 23 is provided inside the anchor body 1 to limit the partition plate 6, preventing the partition plate 6 from moving and separating from the grout guide pipe 22, which would prevent the grout from entering the cone head 3.

[0040] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0041] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. An expandable grouting anchor rod for tunnel construction, characterized by, include: The anchor body (1) is hollow and has a grouting port (2) and a cone head (3) at both ends respectively. An expansion section (10) is provided at one end of the anchor body (1) near the cone (3), and an anchoring wing (4) is provided inside the expansion section, which unfolds on the outside of the anchor body (1). The grouting part (20) is located between the grouting port (2) and the expansion part (10) of the anchor body (1), and the grouting part (20) has grout outlet holes (5) evenly distributed on it. A partition (6) is provided between the expansion section (10) and the grouting section (20), and the partition (6) is slidably connected to the inner wall of the cavity of the anchor body (1); The expansion section (10) includes: The seat (11) is located inside the cavity of the anchor body (1) and connected to the cone head (3); An elastic telescopic rod (16) is connected to the side of the base (11) near the grouting part (20); The drive plate (12) is connected to the telescopic end of the elastic telescopic rod (16); The connecting rod (13) is hinged at one end to the edge of the drive plate (12) and extends out of the anchor rod body (1) at the other end. The anchoring wing (4) is hinged at both ends to the connecting rod (13) and the seat body (11) respectively.

2. The expandable grouting anchor rod for tunnel construction according to claim 1, characterized in that, On the opposite side of the partition (6) and the drive plate (12), there are a first magnetic plate (14) and a second magnetic plate (15) with the same magnetic properties, and there is a gap between them under the action of magnetic force.

3. The expandable grouting anchor rod for tunnel construction according to claim 1, characterized in that, Multiple anchoring wings (4) are evenly arranged along the circumference of the anchor body (1), and multiple connecting rods (13) are evenly arranged along the circumference of the drive plate (12). The connecting rods (13) are connected to the anchoring wings (4) one by one.

4. The expandable grouting anchor bolt for tunnel construction according to claim 1, characterized in that, The side wall of the anchor body (1) is provided with a side groove (17) through which the connecting rod (13) and the anchor wing (4) pass, and the anchor wing (4) is partially or completely contained in the side groove (17).

5. The expandable grouting anchor bolt for tunnel construction according to claim 1, characterized in that, The outer side of the anchoring wing (4) is provided with several anti-slip tips (18).

6. The expandable grouting anchor bolt for tunnel construction according to claim 1, characterized in that, It also includes a pressure bar (19), which extends from the grouting port (2) of the anchor body (1) and presses against the partition plate (6).

7. The expandable grouting anchor bolt for tunnel construction according to claim 1, characterized in that, The cone (3) is set with a cavity structure and multiple cone grout outlet holes (21) are arranged on its outer wall. A grout guide pipe (22) is set inside the anchor body (1). One end of the grout guide pipe (22) is connected to the cone (3), and the other end extends through the partition (6) into the grouting part (20).

8. The expandable grouting anchor bolt for tunnel construction according to claim 7, characterized in that, The inner wall of the anchor body (1) is provided with a protrusion (23) for limiting the position of the partition (6).

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