Hollow grouting anchor rod for underground powerhouse supporting and construction method

Abstract

The hollow grouting anchor rod comprises an outer rod, an inner rod and a limiting assembly, the outer rod and the inner rod are both hollow rods, the inner rod is coaxially sleeved with the outer rod, the upper ends and the lower ends of the inner rod and the outer rod are fixedly connected, and a grouting stop gasket is fixedly arranged on the outer wall of the upper end of the outer rod; a tail plug is installed at the upper end of the outer rod through threads, a hollow anchor head is installed at the lower end of the outer rod, and the limiting assembly is arranged between the inner rod and the outer rod. The limiting assembly comprises a slurry outlet hole, a round hole, a sliding piece and an elastic limiting piece. During grouting, grout in the hole enters the outer rod from the grout outlet hole to push the sliding piece to move, limiting of the sliding piece to the sharp block is relieved, the sharp block penetrates through the outer rod to penetrate into the hole wall under the action of the spring, the hollow anchor rod is stably fixed in the hole, and therefore the supporting contact face of the outer rod and the inner wall of the hole is increased, and the problem that under the high-pressure grouting condition, the hole cannot be damaged is solved. And anchor rod shaking and anchoring failure are easily caused, and reworking is caused.

Description

Technical Field

[0001] This invention relates to the field of underground powerhouse construction technology, and in particular to a hollow grouting anchor rod and its construction method for underground powerhouse support. Background Technology

[0002] Hollow grouting anchors are widely used in underground powerhouse support. They reinforce the anchor rod by injecting grout, thus strengthening the bond between the anchor rod and the surrounding soil and rock. However, existing hollow grouting anchors often encounter problems in underground powerhouse support, such as simple rod structure and unstable anchoring, especially under high-pressure grouting conditions. This can easily lead to anchor swaying and anchoring failure, resulting in rework and reduced overall construction efficiency. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides a hollow grouting anchor rod and its construction method for underground powerhouse support. By adding a limiting component to the existing hollow anchor rod, the support contact surface between the outer rod and the inner wall of the hole is increased, thus solving the problem of anchor rod swaying and anchoring failure under high-pressure grouting conditions, which leads to rework.

[0004] To solve the above-mentioned technical problems, the present invention provides a technical solution: a hollow grouting anchor rod for underground powerhouse support, comprising an outer rod, an inner rod, and a limiting component, characterized in that: both the outer rod and the inner rod are hollow rods, the outer rod is coaxially sleeved outside the inner rod, and the upper and lower ends of the inner rod and the outer rod are fixedly connected, a grout-stopping gasket is fixedly provided on the outer wall of the upper end of the outer rod, a tail plug is threadedly installed on the upper end of the outer rod, a hollow anchor head is installed on the lower end of the outer rod, and the limiting component is disposed between the inner rod and the outer rod; The limiting assembly includes a slurry outlet hole, a circular hole, a sliding plate, and an elastic limiting member. The circular hole and the slurry outlet hole are respectively disposed on the side wall of the outer rod. One end of the elastic limiting member is fixedly connected to the outer wall of the inner rod, and the other end of the elastic limiting member abuts against the top of the sliding plate and presses the sliding plate against the inner wall of the outer rod, so that the top of the sliding plate covers the circular hole and the bottom of the sliding plate covers the slurry outlet hole. The other end of the elastic limiting member corresponds to the circular hole. When the sliding plate slides down, the other end of the elastic limiting member can extend out of the outer rod through the circular hole.

[0005] Furthermore, at least two of the limiting components are evenly arranged along their axes between the inner and outer rods.

[0006] Furthermore, the elastic limiting member includes a base plate, a spring, and a pointed block, which are welded together in sequence. The base plate is welded to the outer wall of the inner rod, and the pointed block has its tip facing outward and abutting against the upper end of the sliding piece.

[0007] Furthermore, a pad is fitted onto the outer rod on the upper side of the grout stop washer, and the pad is pressed and fixed onto the grout stop washer by a nut.

[0008] Furthermore, the sliding plate includes a straight plate one, a straight plate two, and an arc-shaped plate. The straight plate one and the arc-shaped plate are vertically arranged and connected end to end by the horizontal straight plate two. The arc-shaped plate covers the discharge hole.

[0009] Furthermore, the upper part of the inner rod is funnel-shaped, and the upper end of the inner rod is welded to the upper end of the outer rod, while the lower end of the inner rod is mechanically connected to the hollow anchor head.

[0010] Furthermore, a check plate is provided on the lower outer wall of the outer rod.

[0011] Furthermore, the sliding sheet is made of polytetrafluoroethylene.

[0012] To solve the above-mentioned technical problems, the present invention provides a technical solution as follows: A construction method for a hollow grouting anchor bolt used for underground powerhouse support, as described above, comprises the following steps: S1. Insert the assembled anchor rod into the hole to be grouted, so that the hollow anchor head reaches the bottom of the hole. Confirm that the check plate is fastened to the outer wall of the hole by gently pulling the pad. Unscrew the tail plug to expose the inner rod and prepare for grouting. S2. Inject the grout into the inner rod. The grout gradually diffuses into the hole outside the outer rod through the hollow anchor head. When the grout in the hole reaches the grout outlet, the grout pressure causes the sliding plate to slide down, releasing the sharp block of the elastic limiter. The sharp block pops out under the action of the spring, passes through the round hole, and pierces the hole wall. S3. Continue grouting and repeat step S2 above until the grout overflows from the inner rod. Then, screw the tail plug back on through the thread to complete the grouting process.

[0013] Furthermore, in step S2, the process of the slurry pressure causing the sliding plate to slide down and releasing the pointed block of the elastic limiting member is as follows: Since the slurry outlet is below the round hole and the diameter of the slurry outlet is larger than that of the round hole, when the slurry in the hole enters between the inner rod and the outer rod through the slurry outlet, due to the lever principle, it pushes the bottom of the sliding plate away from the slurry outlet, causing the sliding plate to rotate around the contact point between the pointed block and the sliding plate. During the rotation, the slurry pushes the sliding plate to move with the slurry through the straight plate, thereby causing the sliding plate to separate from the pointed block. The pointed block passes through the round hole under the action of the spring.

[0014] The beneficial effects of this invention are as follows: 1. This application adds a limiting component to the existing hollow anchor rod. During grouting, the grout in the hole enters the outer rod from the grout outlet and pushes the sliding plate to move, releasing the limiting component of the pointed block. Under the action of the spring, the pointed block passes through the outer rod and pierces the hole wall, so that the hollow anchor rod is stably fixed in the hole. This increases the support contact surface between the outer rod and the inner wall of the hole, solving the problem that anchor rod shaking and anchoring failure are easy to occur under high pressure grouting conditions, resulting in rework.

[0015] 2. In this application, at least two limiting components can be uniformly arranged along the axis between the inner rod and the outer rod to increase the stability of the anchor rod.

[0016] 3. In this application, the base plate, spring and pointed block form an elastic limiting component. The spring pushes the tip of the pointed block against the sliding plate and presses the sliding plate against the inner wall of the outer rod to limit the pointed block. When the pointed block is pressed against the sliding plate, it is easy for the sliding plate to disengage from the tip and release the pointed block.

[0017] 4. The grout stop gasket in this application can seal the hole opening when the outer rod is inserted into the hole, reducing grout leakage. The gasket can be detachably installed on the outer rod by means of a nut, which facilitates operation.

[0018] 5. In this application, the bottom of the sliding plate forms a raised structure through the straight plate and the arc plate, which facilitates the movement of the sliding plate by the slurry entering the outer rod from the slurry outlet, thereby facilitating the release of the sharp block.

[0019] 6. In this application, the upper part of the inner rod is funnel-shaped to facilitate welding to the upper end of the outer rod, and the lower end of the inner rod is mechanically connected to the hollow anchor head, so that the outer rod and the inner rod are in a coaxial state; a check plate is provided on the lower outer wall of the outer rod to further increase the stability of the connection between the outer rod and the hole; the sliding plate is made of polytetrafluoroethylene, which will not react with the slurry and ensure quality.

[0020] To make the above and other objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in this invention or the prior art, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only four of the drawings in this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of this application.

[0023] Figure 2 This is a schematic diagram of the elastic limiting component.

[0024] Figure 3 This is a schematic diagram of the sliding plate.

[0025] Figure 4 This is a schematic diagram of the structure used in this application.

[0026] In the diagram: 1-outer rod, 2-grout outlet, 3-round hole, 4-inner rod, 5-elastic limiting component, 6-sliding plate, 7-pad, 8-grout stop washer, 9-nut, 10-tail plug, 11-hollow anchor head, 12-check valve; 501 - Base plate, 502 - Spring, 503 - Pointed block; 601-Straight Plate 1, 602-Straight Plate 2, 603-Curved Plate. Detailed Implementation

[0027] Embodiments of the invention will now be described in detail with reference to the accompanying drawings. While some embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the invention. It should be understood that the drawings and embodiments of the invention are for illustrative purposes only and are not intended to limit the scope of protection of the invention.

[0028] The names of messages or information exchanged between the various devices, systems, equipment, and modules in the embodiments of this invention are for illustrative purposes only and are not intended to limit the scope of these messages or information. Example 1

[0029] like Figure 1-4As shown, a hollow grouting anchor bolt for underground powerhouse support includes an outer rod 1, an inner rod 4, and a limiting assembly. The outer rod 1 and inner rod 4 are both hollow rods. The outer rod 1 is coaxially sleeved around the inner rod 4, and the upper and lower ends of the inner rod 4 and outer rod 1 are fixedly connected. A grout-stopping gasket 8 is fixedly installed on the upper outer wall of the outer rod 1. A tail plug 10 is threaded onto the upper end of the outer rod 1, and a hollow anchor head 11 is installed at the lower end of the outer rod 1. The limiting assembly is located between the inner rod 4 and the outer rod 1. The limiting assembly includes a grout outlet hole 2, a circular hole 3, a sliding piece 6, and an elastic limiting element 5. The circular hole 3 and the grout outlet hole 2 are correspondingly positioned on the side wall of the outer rod 1. One end of the elastic limiting element 5 is fixedly connected to the outer wall of the inner rod 4, and the other end of the elastic limiting element 5 abuts against the sliding piece 6. The top of the sliding plate 6 is pressed against the inner wall of the outer rod 1, so that the top of the sliding plate 6 covers the round hole 3 and the bottom of the sliding plate 6 covers the grout outlet hole 2. The other end of the elastic limiting member 5 corresponds to the round hole 3. When the sliding plate 6 slides down, the other end of the elastic limiting member 5 can extend out of the outer rod 1 through the round hole 3. During grouting, the grout in the hole enters the outer rod 1 from the grout outlet hole 2 and pushes the sliding plate 6 to move, releasing the limiting of the elastic limiting member 5 by the sliding plate 6. The end of the elastic limiting member 5 passes through the outer rod 1 and contacts the hole wall, so that the hollow anchor rod is stably fixed in the hole. This increases the support contact surface between the outer rod 1 and the inner wall of the hole, solving the problem that the anchor rod is prone to shaking and anchoring failure under high pressure grouting conditions, resulting in rework. Example 2

[0030] This embodiment is obtained by adding technical features such as limiting components based on embodiment one. The remaining technical features are the same as those in embodiment one, and the similarities will not be repeated here. The difference between this embodiment and embodiment one is that at least two limiting components are evenly arranged along the axis between the inner rod 4 and the outer rod 1.

[0031] In this embodiment, depending on the actual situation and the length of the outer rod 1, at least two limiting components can be uniformly arranged along the axis between the inner rod 4 and the outer rod 1 to increase the stability of the anchor rod. Example 3

[0032] like Figure 1-2 As shown, this embodiment is obtained by describing the technical features of the elastic limiting member 5 in detail based on the second embodiment. The other technical features are the same as those in the second embodiment, and the similarities will not be repeated here. The difference between this embodiment and the second embodiment is that the elastic limiting member 5 includes a base plate 501, a spring 502 and a pointed block 503. The base plate 501, the spring 502 and the pointed block 503 are welded together in sequence. The base plate 501 is welded to the outer wall of the inner rod 4. The tip of the pointed block 503 faces outward and abuts against the upper end of the sliding piece 6.

[0033] The sliding plate 6 is made of polytetrafluoroethylene. The sliding plate 6 includes a straight plate 601, a straight plate 602, and an arc plate 603. The straight plate 601 and the arc plate 603 are vertically arranged and connected end to end by the horizontal straight plate 602. The arc plate 603 covers the discharge hole.

[0034] In this embodiment, the base plate 501, spring 502 and pointed block 503 form an elastic limiting member 5. The spring 502 pushes the tip of the pointed block 503 against the sliding plate 6 and presses the sliding plate 6 against the inner wall of the outer rod 1 to limit the pointed block 503. When the pointed block 503 is pressed against the sliding plate 6, it is easy for the sliding plate 6 to disengage from the tip and release the pointed block 503 when the sliding plate 6 rotates around the tip. It is also easy for the pointed block 503 to be inserted into the side wall of the hole under the action of the spring force of the spring 502. The sliding plate 6 is made of polytetrafluoroethylene, which will not react with the slurry and ensures quality. The bottom of the sliding plate 6 forms a raised structure through the straight plate 2 602 and the arc plate 603. The arc plate 603 is designed to facilitate the movement of the sliding plate 6 by the slurry entering the outer rod 1 from the slurry outlet 2, so that the sliding plate 6 rotates around the tip of the pointed block 503. The straight plate 2 602 is perpendicular to the straight plate 1 601. During the rotation, the straight plate 2 602 gradually becomes perpendicular to the outlet, which facilitates the slurry to push the sliding plate 6, thereby facilitating the release of the pointed block 503. Example 4

[0035] like Figure 1 As shown, this embodiment is obtained by adding technical features such as the pad 7 on the basis of embodiment three. The other technical features are the same as those in embodiment three. The similarities will not be repeated here. The difference between this embodiment and embodiment three is that the pad 7 is fitted on the outer rod 1 on the upper side of the grout stop pad 8, and the pad 7 is pressed and fixed on the grout stop pad 8 by the nut 9; the upper part of the inner rod 4 is funnel-shaped, and the upper end of the inner rod 4 is welded to the upper end of the outer rod 1, and the lower end of the inner rod 4 is mechanically connected to the hollow anchor head 11.

[0036] In this embodiment, the grout-stopping gasket 8 can seal the hole opening when the outer rod 1 is inserted into the hole, reducing grout leakage. The gasket 7 is detachably mounted on the outer rod 1 via the nut 9, which facilitates operation. The upper part of the inner rod 4 is funnel-shaped, which facilitates welding to the upper end of the outer rod 1. The lower end of the inner rod 4 is mechanically connected to the hollow anchor head 11, so that the outer rod 1 and the inner rod 4 are in a coaxial state. Example 5

[0037] like Figure 1 As shown, this embodiment is obtained by adding technical features such as a check plate 12 on the basis of embodiment 3. The other technical features are the same as those in embodiment 3. The similarities will not be repeated here. The difference between this embodiment and embodiment 3 is that a check plate 12 is provided on the lower outer wall of the outer rod 1.

[0038] In this embodiment, a check plate 12 is provided on the lower outer wall of the outer rod 1 to further increase the stability of the connection between the outer rod 1 and the hole.

[0039] The overall technical solution formed by the above-mentioned technical features is another technical solution disclosed in this application, which is: a construction method for hollow grouting anchor rods used for underground powerhouse support, the steps of which are: S1. Insert the assembled anchor rod into the hole to be grouted, so that the hollow anchor head 11 reaches the bottom of the hole. Confirm that the check plate 12 is fastened to the outer wall of the hole by gently pulling the pad 7. Unscrew the tail plug 10 to expose the inner rod 4 and prepare for grouting. S2. The grout is injected into the inner rod 4. The grout gradually diffuses into the hole outside the outer rod 1 through the hollow anchor head 11. When the grout in the hole reaches the grout outlet 2, the grout pressure causes the sliding plate 6 to slide down, releasing the tip 503 of the elastic limiting member 5. The tip 503 is ejected under the action of the spring 502, passes through the round hole 3 and pierces the hole wall. S3. Continue grouting and repeat step S2 above until the grout overflows from the inner rod 4. Then, screw the tail plug 10 back on through the thread to complete the grouting process.

[0040] In step S2, the slurry pressure causes the sliding plate 6 to slide down, and the process of releasing the tip 503 of the elastic limiting member 5 is as follows: Since the slurry outlet 2 is below the circular hole 3 and the diameter of the slurry outlet 2 is larger than that of the circular hole 3, when the slurry in the hole enters between the inner rod 4 and the outer rod 1 through the slurry outlet 2, due to the lever principle, it pushes the bottom of the sliding plate 6 away from the slurry outlet 2, so that the sliding plate 6 rotates around the contact point between the tip 503 and the sliding plate 6. During the rotation, the slurry pushes the sliding plate 6 to move with the slurry through the straight plate 602, so that the sliding plate 6 separates from the tip 503, and the tip 503 passes through the circular hole 3 under the action of the spring 502.

[0041] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A hollow grouting anchor for underground powerhouse support, comprising an outer rod, an inner rod, and a limiting assembly, characterized in that: Both the outer rod and the inner rod are hollow rods. The outer rod is coaxially sleeved on the outside of the inner rod, and the upper and lower ends of the inner rod and the outer rod are fixedly connected. A grout-stopping gasket is fixedly installed on the outer wall of the upper end of the outer rod. A tail plug is threaded on the upper end of the outer rod. A hollow anchor head is installed on the lower end of the outer rod. The limiting component is set between the inner rod and the outer rod. The limiting assembly includes a slurry outlet hole, a circular hole, a sliding plate, and an elastic limiting member. The circular hole and the slurry outlet hole are respectively disposed on the side wall of the outer rod. One end of the elastic limiting member is fixedly connected to the outer wall of the inner rod, and the other end of the elastic limiting member abuts against the top of the sliding plate and presses the sliding plate against the inner wall of the outer rod, so that the top of the sliding plate covers the circular hole and the bottom of the sliding plate covers the slurry outlet hole. The other end of the elastic limiting member corresponds to the circular hole. When the sliding plate slides down, the other end of the elastic limiting member can extend out of the outer rod through the circular hole.

2. A hollow grouting anchor bolt for underground powerhouse support according to claim 1, characterized in that: At least two of the limiting components are evenly arranged along their axis between the inner and outer rods.

3. A hollow grouting anchor for underground powerhouse support according to claim 1 or 2, characterized in that: The elastic limiting component includes a base plate, a spring, and a pointed block. The base plate, spring, and pointed block are welded together in sequence. The base plate is welded to the outer wall of the inner rod, and the pointed block has its tip facing outward and abutting against the upper end of the sliding plate.

4. A hollow grouting anchor bolt for underground powerhouse support according to claim 3, characterized in that: A pad is fitted onto the outer rod on the upper side of the grout stop gasket, and the pad is pressed and fixed onto the grout stop gasket by a nut.

5. A hollow grouting anchor bolt for underground powerhouse support according to claim 4, characterized in that: The sliding plate includes a straight plate one, a straight plate two, and an arc plate. The straight plate one and the arc plate are vertically arranged and connected end to end by the horizontal straight plate two. The arc plate covers the discharge hole.

6. A hollow grouting anchor for underground powerhouse support according to claim 3, characterized in that: The upper part of the inner rod is funnel-shaped, and the upper end of the inner rod is welded to the upper end of the outer rod. The lower end of the inner rod is mechanically connected to the hollow anchor head.

7. A hollow grouting anchor for underground powerhouse support according to claim 1, characterized in that: The lower end of the outer rod is provided with a check plate.

8. A hollow grouting anchor for underground powerhouse support according to claim 1, characterized in that: The sliding piece is made of polytetrafluoroethylene.

9. A construction method for a hollow grouting anchor bolt for underground powerhouse support according to any one of claims 1-8, comprising the following steps: S1. Insert the assembled anchor rod into the hole to be grouted, so that the hollow anchor head reaches the bottom of the hole. Confirm that the check plate is fastened to the outer wall of the hole by gently pulling the pad. Unscrew the tail plug to expose the inner rod, ready for grouting; S2. Inject the grout into the inner rod. The grout gradually diffuses into the hole outside the outer rod through the hollow anchor head. When the grout in the hole reaches the grout outlet, the grout pressure causes the sliding plate to slide down, releasing the sharp block of the elastic limiter. The sharp block pops out under the action of the spring, passes through the round hole, and pierces the hole wall. S3. Continue grouting and repeat step S2 above until the grout overflows from the inner rod. Then, screw the tail plug back on through the thread to complete the grouting process.

10. The construction method according to claim 9, characterized in that: In step S2, the process of the slurry pressure causing the sliding plate to slide down and releasing the pointed block of the elastic limiting member is as follows: Since the slurry outlet is below the round hole and the diameter of the slurry outlet is larger than that of the round hole, when the slurry in the hole enters between the inner rod and the outer rod through the slurry outlet, due to the lever principle, it pushes the bottom of the sliding plate away from the slurry outlet, causing the sliding plate to rotate around the contact point between the pointed block and the sliding plate. During the rotation, the slurry pushes the sliding plate to move with the slurry through the straight plate, thereby causing the sliding plate to separate from the pointed block. The pointed block passes through the round hole under the action of the spring.

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