A grouting expansion anchor

Abstract

The invention discloses a grouting type expansion anchor rod, comprising an anchoring end, a shell, a hollow grouting rod body and a grouting tray, wherein the anchoring end is connected to the shell, the arc section of the anchoring end has grouting holes uniformly distributed, and a large number of picks are unevenly distributed outside the arc section; the shell is composed of a grouting section and an expansion section alternately, the grouting section has a plurality of grouting holes, the expansion section comprises an anchor block and a crescent-shaped expansion device, the expansion device is hinged to the shell, and the expansion device is hinged to the inside of the shell through a one-way bearing; one end of the hollow grouting rod body passes through the center of the extrusion ball and is welded to the extrusion ball (7) as a whole, and the other end of the hollow grouting rod body is connected to a rotating block through a through hole of the grouting tray, and the rotating block drives the extrusion ball at the lower end of the hollow grouting rod body to move upward, pushes the arc-shaped baffle at the lower part of the expansion device, and expands the expansion device. The invention has uniform grouting, high anchoring strength, and provides high prestress, and is suitable for soft rock tunnels.

Description

Technical Field

[0001] The invention belongs to the technical field of soft surrounding rock stability control, and more specifically, relates to a grouting type expansion anchor rod. Background Art

[0002] Anchors have been widely used to control the stability of rock masses in mines, tunnels, bridges, and slope projects. In the current anchor support technology, grouting anchors have a certain support effect on soft rock tunnels with obvious time effect. Grouting is injected into the pipe-seam anchor to increase the shear strength of the rod body, increase the friction between the rod body and the borehole, and cement the cracks of the broken surrounding rock through the penetration of slurry, thereby improving the stability of the surrounding rock. However, in engineering practice, this method has some shortcomings: (1) The rod body is grouted once, and the contact surface between the pipe-seam anchor and the slurry is limited. During the solidification period, the slurry is easy to flow out or solidify unevenly, and fails to fully solidify into a whole, resulting in low anchor strength and easy pullout; (2) The surrounding rock is weak, there are a large number of cracks, and the rheological phenomenon is obvious. The anchor cannot apply a sufficiently large radial prestress to the surrounding rock when inserted into the borehole. During the whole grouting process, the surrounding rock continues to deform, which is easy to cause large deformation in the early stage of tunnel excavation.

[0003] Therefore, it is necessary to provide a new anchor rod suitable for soft rock tunnels to solve the above technical problems. Summary of the invention

[0004] The object of the present invention is to provide a grouting type expansion anchor rod, which has uniform grouting, high anchoring strength, provides high prestress and is suitable for soft rock tunnels.

[0005] The technical solution of the present invention is:

[0006] A grouting expansion anchor, comprising a detachable anchoring end, a shell, a hollow grouting rod body and a grouting tray, wherein the anchoring end is connected to the shell, the anchoring end is in a capsule shell shape as a whole, the anchoring end comprises a straight section and an arc section, the straight section is provided with an internal thread, the arc section has grouting holes uniformly distributed therethrough, and a large number of picks are unevenly distributed outside the arc section;

[0007] The shell is composed of alternating grouting sections and expansion sections, and the grouting sections are provided with a plurality of grouting holes; the expansion section comprises an anchor block and a crescent-shaped expansion device, the expansion device is hinged to the shell, the expansion device is hinged to the inside of the shell through a one-way bearing, the one-way bearing and the expansion device are welded into an expansion unit, and the expansion device is arc-shaped inwardly facing;

[0008] One end of the hollow grouting rod body passes through the center of the extrusion ball, and the hollow grouting rod body and the extrusion ball are welded as a whole, and the other end of the hollow grouting rod body is connected to the rotating block through the through hole of the slurry stopping tray. The rotating block drives the extrusion ball at the lower end of the hollow grouting rod body to move upward, pushing the arc baffle at the lower part of the expansion device to expand the expansion device.

[0009] Furthermore, the grouting sections and the expansion sections are alternately arranged coaxially and equidistantly, and the grouting holes are evenly and equidistantly arranged.

[0010] Furthermore, the outer shell is provided with an external thread near the anchoring end, and the outer shell and the anchoring end are connected through the external thread and the internal thread.

[0011] Furthermore, the curvature of the baffle is consistent with the curvature of the extrusion ball.

[0012] Furthermore, the one-way bearing rotates in the opposite direction along the center of the shell cross section.

[0013] Furthermore, a grouting stopper is arranged outside the hollow grouting rod body.

[0014] Furthermore, the rotating block is arranged in a hexagonal shape.

[0015] Furthermore, the grout-stopping tray is a high-strength detachable tray. After the grouting is completed, the grout-stopping tray is removed, the hollow grouting rod body and the squeezing ball are taken out, and the grouting is blocked with a grout-stopping cap.

[0016] Beneficial effects of the present invention:

[0017] 1. By equidistantly and alternately setting the grouting section and the expansion section, the anchor strength and the surrounding rock prestress can be evenly increased, thereby improving the overall integrity of the surrounding rock;

[0018] 2. When the extrusion ball moves to each anchor unit baffle, each baffle can form a closed small area with the anchor end space, and grouting is performed in a small area through the diversion hole of the hollow grouting rod body. Therefore, multiple small area groutings can make the slurry solidify evenly and improve the integrity of the grouting anchor rod;

[0019] 3. After the grouting process is completed, the stop grouting tray is removed, the hollow grouting rod and the extrusion ball are recovered and reused to improve economic benefits;

[0020] 4. The squeezing ball pushes the expansion unit to expand together with the anchor block. The cooperation between the expansion unit and the anchor block greatly increases the anchoring force.

[0021] 5. The anchoring end is detachable, which makes it easy to insert the hollow grouting rod and the extrusion ball into the shell. A large number of irregular picks are distributed on the outer surface of the arc surface, which can destroy the broken rock during insertion and facilitate entry into the bottom of the borehole. The slurry flows out through the grouting hole, and the rough protrusions can also increase the anchoring force of the anchoring end. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present invention;

[0023] Figure 2 It is a schematic diagram of the expansion section structure of the present invention;

[0024] Figure 3It is a schematic diagram of the anchoring end structure of the present invention.

[0025] Figure markings: 1-anchoring end; 101-cutting tooth; 102-internal thread; 2-housing; 3-grouting section; 4-expansion section; 401-anchoring block; 402-expansion device; 403-baffle; 404-one-way bearing; 5-grouting hole; 6-hollow grouting rod body; 7-squeezing ball; 8-grouting stop tray; 9-rotating block; 10-external thread; 11-grouting stop plug; 12-grouting stop cap. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings and implementation modes.

[0027] See also Figure 1-3 A grouting expansion anchor, comprising a detachable anchoring end 1, a shell 2, a hollow grouting rod body 6 and a grouting tray 8, wherein the anchoring end 1 is connected to the shell 2, the anchoring end 1 is in the shape of a capsule shell, the anchoring end comprises a straight section and an arc section, the straight section is provided with an internal thread 102, the arc section has grouting holes 5 evenly distributed, and a large number of picks 101 are unevenly distributed outside the arc section;

[0028] The housing 2 is composed of grouting sections 3 and expansion sections 4 alternately, and a plurality of grouting holes 5 are provided on the grouting sections 3; the expansion sections 4 include anchor blocks 401 and crescent-shaped expansion devices 402, and the expansion devices 402 are hinged to the housing 2; the expansion devices 402 are hinged to the inside of the housing 2 through a one-way bearing 404, and the one-way bearing 404 and the expansion devices 402 are welded into an expansion unit, and the expansion devices 402 are arc-shaped and face inward;

[0029] One end of the hollow grouting rod body 6 passes through the center of the squeezing ball 7 and completely passes through the entire squeezing ball 7. The hollow grouting rod body 6 and the squeezing ball 7 are welded as a whole. The anchoring end 1 is opened to insert the hollow grouting rod body 6 and the squeezing ball 7 as a whole near the anchoring end 1 of the shell axis, and then the anchoring end 1 is closed; the other end of the hollow grouting rod body 6 is connected to the rotating block 9 through the through hole of the grouting stop tray 8. The rotating block 9 drives the squeezing ball 7 at the lower end of the hollow grouting rod body 6 to move upward, thereby pushing the arc-shaped baffle 403 at the lower part of the expansion device 402 to expand the expansion device 402.

[0030] The grouting sections 3 and the expansion sections 4 are alternately arranged coaxially and equidistantly, and the grouting holes 5 are evenly and equidistantly arranged.

[0031] The outer shell 2 is provided with an external thread 10 near the anchoring end, and the outer shell 2 and the anchoring end 1 are connected through the external thread 10 and the internal thread 102 .

[0032] The curvature of the baffle 403 is consistent with that of the squeezing ball 7 .

[0033] The one-way bearing 404 rotates in the opposite direction along the center of the shell cross section, and rotates toward the center of the shell cross section with greater damping, so that the expansion device 402 is expanded outward, and the expansion of the expansion device 402 can also push the anchor block 401 to expand.

[0034] A grouting stopper 11 is disposed outside the hollow grouting rod body 6 .

[0035] The rotating block 9 is hexagonal in shape. The rotating block 9 rotates to drive the hollow grouting rod 6 and the squeezing ball 7 to move toward the grouting stop tray 8. When the squeezing ball 7 pushes each baffle 403, a relatively closed small area can be formed between the anchor end 1. When each small area is formed, grouting is performed, and the squeezing ball 7 continues to be moved after solidification for one hour.

[0036] The grout-stopping tray 8 is a high-strength detachable tray. After grouting is completed, the grout-stopping tray 8 is first removed, and then the hollow grouting rod body 6 and the squeezing ball 7 are taken out, and finally the grouting is blocked by the grout-stopping cap 12.

[0037] The present invention can evenly increase the anchor strength and the surrounding rock prestress by equidistantly and alternately arranging the grouting sections and the expansion sections, thereby improving the overall integrity of the surrounding rock; when the squeezing ball moves to each anchor unit baffle, each baffle can form a closed small area with the anchor end space, and small area grouting is performed through the guide holes of the hollow grouting rod body, so multiple small area groutings are performed, so that the slurry solidifies evenly and the integrity of the grouting anchor is improved; after the grouting process is completed, the grouting stop tray is removed, the hollow grouting rod body and the squeezing ball are recovered and reused, thereby improving economic benefits; the squeezing ball pushes the expansion unit to unfold together with the anchor block, and the mutual cooperation between the expansion unit and the anchor block greatly increases the anchoring force; the anchor end is detachable, which is convenient for inserting the hollow grouting rod body and the squeezing ball into the shell, and a large number of irregular picks are distributed on the outer surface of the arc surface, which destroy the broken rock during insertion and facilitate entering the bottom of the borehole, and the slurry flows out through the grouting holes, and the rough protrusions can also increase the anchoring force of the anchor end.

[0038] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the technical solution of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. A grouting expansion anchor, characterized in that: The invention comprises a detachable anchoring end (1), an outer shell (2), a hollow grouting rod body (6) and a grouting stop tray (8); the anchoring end (1) is connected to the outer shell (2); the anchoring end (1) is in the shape of a capsule shell as a whole; the anchoring end comprises a straight section and an arc section; the straight section is provided with an internal thread (102); the arc section has grouting holes (5) uniformly distributed therethrough; and a large number of picks (101) are unevenly distributed outside the arc section; The shell (2) is composed of grouting sections (3) and expansion sections (4) alternately, and the grouting sections (3) are provided with a plurality of grouting holes (5); the expansion sections (4) include an anchor block (401) and a crescent-shaped expansion device (402), the expansion device (402) is hinged to the shell (2), the expansion device (402) is hinged to the inside of the shell (2) via a one-way bearing (404), the one-way bearing (404) and the expansion device (402) are welded to form an expansion unit, and the expansion device (402) is arc-shaped and faces inward; One end of the hollow grouting rod body (6) completely passes through the entire squeezing ball (7), and the hollow grouting rod body (6) and the squeezing ball (7) are welded as a whole. The anchoring end (1) is opened, and the hollow grouting rod body (6) and the squeezing ball (7) are inserted as a whole near the anchoring end (1) of the shell axis, and the anchoring end (1) is closed; the other end of the hollow grouting rod body (6) is connected to the rotating block (9) through the through hole of the grouting stop tray (8), and the rotating block (9) drives the squeezing ball (7) at the lower end of the hollow grouting rod body (6) to move upward, pushing the arc-shaped baffle (403) at the lower part of the expansion device (402), so that the expansion device (402) and the anchoring block (401) are unfolded together; when the squeezing ball moves to each anchoring unit baffle, each baffle can form a closed small area with the anchoring end space, and grouting of the small area is performed through the guide hole of the hollow grouting rod body; The grouting sections (3) and the expansion sections (4) are alternately arranged at equal distances and coaxially, and the grouting holes (5) are evenly arranged at equal distances; The curvature of the baffle (403) is consistent with the curvature of the squeezing ball (7); The one-way bearing (404) rotates in the opposite direction along the center of the shell cross section; A grouting stopper (11) is arranged outside the hollow grouting rod body (6); The grout-stopping tray (8) is a high-strength detachable tray. After grouting is completed, the grout-stopping tray (8) is removed, the hollow grouting rod body (6) and the squeezing ball (7) are taken out, and the grout-stopping cap (12) is used to block the grouting.

2. A grouting type expansion anchor as claimed in claim 1, characterized in that: The outer shell (2) is provided with an external thread (10) near the anchoring end, and the outer shell (2) and the anchoring end (1) are connected via the external thread (10) and the internal thread (102).

3. A grouting type expansion anchor as claimed in claim 1, characterized in that: The rotating block (9) is hexagonal.

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