A grouting pipe for reinforcing rock wall in micro-clearance tunnel

Abstract

The present application provides a kind of grouting pipe for small clear spacing tunnel rock wall reinforcement, including outer catheter, telescopic pipe body, grouting pipe body, cushion component and tensioning mechanism, the present application inserts into the inside of grouting hole, telescopic pipe body is inserted into the inside of grouting hole, grouting pipe body is inserted into the inside of outer catheter, when grouting pipe body is inserted into the inside of outer catheter, extrusion plate will extrude push plate to two sides, so as to drive the telescopic catheter of two sides to move to outside, let telescopic catheter be inserted into the inside of small clear spacing tunnel rock wall, it plays a good fixed effect to the whole grouting pipe, in the process of continuously pushing, when lower pressing plate is on the upper end of push plate, push plate is pushed down, at this time extrusion ring falls from unlocking hole, under the action of extrusion spring, let telescopic catheter inside be closely attached to the grouting hole of grouting catheter, when grouting, grouting is carried out through grouting catheter, grout flows into telescopic catheter along grouting hole, and grouting is carried out through grouting hole.

Description

Technical Field

[0001] This invention relates to the field of grouting pipe equipment technology, specifically a grouting pipe for reinforcing rock walls in tunnels with small clearances. Background Technology

[0002] Minimal clearance tunnels refer to a special tunnel layout where the thickness of the central rock wall is less than the minimum clearance of a separated twin-bore tunnel. They are commonly used in medium- or short tunnels with narrow entrance terrain or special requirements, as well as in local sections of long or extra-long tunnels. Because the thickness of the central rock wall in a minimal clearance tunnel is much smaller than in a typical twin-bore tunnel, the stress is more complex. Therefore, during grouting, it is necessary to ensure that the grouting pipe is firmly fixed inside the grouting hole to prevent detachment during grouting. Furthermore, due to the complex stress conditions of the central rock wall in a minimal clearance tunnel, the grout must be injected into the interior of the weak rock layer to ensure the stability of the central rock wall.

[0003] The high-pressure jet grouting pipe disclosed in CN 116770845 A uses multiple sets of nozzles to perform high-pressure jet grouting from top to bottom inside the borehole. However, this device cannot be well fixed inside the middle rock wall of a tunnel with a small clearance, and cannot directly penetrate into the interior of the weak rock layer for grouting. Therefore, the grouting effect on the middle rock wall of a tunnel with a small clearance is not good. Summary of the Invention

[0004] The purpose of this invention is to provide a grouting pipe for reinforcing rock walls in tunnels with small clearances, in order to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A grouting pipe for reinforcing rock walls in tunnels with small clearances, comprising:

[0007] The outer conduit is hollow inside, closed at the lower end, and has two sets of telescopic holes symmetrically arranged on its side.

[0008] The telescopic tube body includes a hollow telescopic conduit, the side wall of which is provided with a hollow grouting hole, the telescopic conduit is disposed in the telescopic hole, a compression ring is fixed to the outside of the telescopic conduit inside the outer conduit, and a compression spring is sleeved on the telescopic conduit, one end of the compression spring abutting against the inner side wall of the outer conduit and the other end abutting against the side of the compression ring.

[0009] The grouting pipe body includes a hollow grouting guide tube. The surface of the grouting guide tube is provided with a grout outlet hole that matches the telescopic guide tube. The grout outlet hole penetrates the side wall of the grouting guide tube. Extrusion plates are fixed on both sides of the grouting guide tube. A lower pressure plate is provided at the upper end of the extrusion plate. The width of the lower pressure plate is greater than the width of the extrusion plate. The bottom of the extrusion plate has a V-shaped structure.

[0010] A push plate is fitted on the telescopic guide tube inside the extrusion ring. The push plate is provided with a hollowed-out locking hole. A hollowed-out unlocking hole is provided at the upper end of the locking hole. The locking hole and the unlocking hole are connected, and the size of the unlocking hole is larger than the size of the extrusion ring.

[0011] When the grouting conduit is inserted inside the outer conduit, and the bottom of the conduit contacts the bottom of the outer conduit, the inner port of the telescopic conduit is located at the grout outlet, the extrusion plate is stuck between the two push plates, and the lower pressure plate is located at the upper end of the push plates;

[0012] The inner side of the push plate is fixed with a support bar. When the grouting pipe is not inserted into the outer pipe, the support bars of the two push plates provide abutment and support.

[0013] Furthermore, the outer conduit is fixed on the padding assembly, which includes an upper pad, through which the outer conduit passes. A connecting screw is fixed to the bottom of the upper pad, and a fixing nut is connected to the bottom of the connecting screw after it passes through a lower pad.

[0014] Furthermore, the bottom of the outer conduit is sealed by a tensioning mechanism, which includes a hinge rod and a moving plate that is locked inside the outer conduit. The moving plate can move up and down inside the outer conduit. A hinge seat is fixed at the bottom of the moving plate. There are four sets of hinge rods that are hinged together, with both ends hinged to the hinge seat. The four hinge rods are arranged in a diamond shape.

[0015] Furthermore, a sealing strip is provided on the side where the telescopic conduit and the grouting conduit fit together.

[0016] Furthermore, the end of the telescopic conduit extending to the outside of the telescopic hole is conical.

[0017] Furthermore, the upper end of the outer conduit is provided with a perforated groove, the shape of which matches the shape of the grouting pipe body. The upper end of the grouting conduit is open, and the lower end is sealed.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] In this invention, the outer guide tube is first inserted into the grouting hole, followed by the telescopic tube. Then, the grouting tube is inserted into the outer guide tube. As the grouting tube is inserted, the extrusion plate pushes the push plate to both sides, causing the telescopic guide tubes on both sides to move outwards. This allows the telescopic guide tubes to be inserted into the middle rock wall of the tunnel with minimal clearance, effectively fixing the entire grouting tube. During continuous pushing, when the pressure plate presses against the upper end of the push plate, it pushes the push plate downwards. At this point, the extrusion ring falls out of the unlocking hole. Under the action of the extrusion spring, the inner side of the telescopic guide tube is pressed tightly against the grout outlet of the grouting guide tube. During grouting, grout is injected through the grouting guide tube, flowing along the grout outlet into the telescopic guide tube and exiting through the grouting hole. Grouting is carried out from the weak rock layer inside the middle rock wall of the tunnel with minimal clearance, ensuring the grouting effect. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall exploded structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the external catheter structure in this invention;

[0022] Figure 3 This is a schematic diagram of the telescopic tube structure in this invention;

[0023] Figure 4 This is a schematic diagram of the push plate structure in this invention;

[0024] Figure 5 This is a schematic diagram of the connection structure between the push plate and the constricting tube body in this invention;

[0025] Figure 6 This is a schematic diagram of the connection structure between the telescopic conduit and the locking hole in this invention;

[0026] Figure 7 This is a schematic diagram of the grouting pipe body in this invention;

[0027] Figure 8 This is a schematic diagram of the connection structure between the push plate and the extrusion plate in this invention;

[0028] Figure 9 This is a schematic diagram of the tensioning mechanism in this invention;

[0029] Figure 10 This is a schematic diagram of the overall structure of the present invention.

[0030] In the diagram: outer guide tube 10, telescopic hole 11, telescopic tube body 20, telescopic guide tube 21, grouting hole 22, extrusion ring 23, extrusion spring 24, push plate 25, locking hole 26, unlocking hole 27, support strip 28, sealing strip 29, grouting tube body 30, grouting guide tube 31, grout outlet hole 32, extrusion plate 33, lower pressure plate 34, cushion layer assembly 40, upper pad plate 41, lower pad plate 42, connecting screw 43, fixing nut 44, tensioning mechanism 50, hinge rod 51, hinge seat 52, moving plate 53, outer guide tube 10, telescopic tube body 20, grouting tube body 30, cushion layer assembly 40, tensioning mechanism 50. Detailed Implementation

[0031] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0032] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0033] Example:

[0034] Please see Figures 1 to 10 The present invention provides a technical solution:

[0035] A grouting pipe for reinforcing rock walls in tunnels with small clearances includes an outer guide tube 10, a telescopic pipe body 20, a grouting pipe body 30, a cushion layer assembly 40, and a tensioning mechanism 50, wherein:

[0036] The outer conduit 10 is hollow inside, closed at the lower end, and has two sets of telescopic holes 11 symmetrically arranged on the side to penetrate the outer conduit 10.

[0037] In this embodiment, the bottom of the outer conduit 10 is closed by a tensioning mechanism 50. The tensioning mechanism 50 includes a hinge rod 51 and a moving plate 53 that is locked inside the outer conduit 10. The moving plate 53 can move up and down inside the outer conduit 10. A limiting mechanism is provided at the bottom of the outer conduit 10. A limiting block or similar structure can be used to ensure that the moving plate 53 can move up and down inside the outer conduit 10 but cannot detach from the outer conduit 10.

[0038] The bottom of the moving plate 53 is fixed with a hinge seat 52. There are four sets of hinge rods 51, which are hinged together. Both ends are respectively hinged to the hinge seat 52. The four hinge rods 51 are arranged in a diamond shape. The hinge rods 51 can rotate freely in the hinge seat 52. When the outer guide tube 10 is inserted into the grouting hole, the end of the hinge rod 51 away from the hinge seat 52 abuts against the side wall of the grouting hole. The grouting pipe body 30 is inserted into the outer guide tube 10, pressing the moving plate 53 downward, opening the four sets of hinge rods 51, and locking them inside the grouting hole, pushing them into the soil layer to achieve the purpose of limiting the position.

[0039] The telescopic tube body 20 includes a hollow telescopic guide tube 21. The side wall of the telescopic guide tube 21 is provided with a hollow grouting hole 22. The telescopic guide tube 21 is set in the telescopic hole 11. A compression ring 23 is fixed to the outside of the telescopic guide tube 21 inside the outer guide tube 10. A compression spring 24 is sleeved on the telescopic guide tube 21. One end of the compression spring 24 abuts against the inner side wall of the outer guide tube 10, and the other end abuts against the side of the compression ring 23. The telescopic guide tube 21 can move along the telescopic hole 11 inside the telescopic hole 11. When the compression ring 23 is pushed outward, it can push the telescopic guide tube 21 to move outward and insert into the weak rock layer.

[0040] Furthermore, the end of the telescopic guide tube 21 extending to the outside of the telescopic hole 11 is conical, which facilitates the insertion of the telescopic guide tube 21 into the weak rock layer for fixation.

[0041] A push plate 25 is fitted onto the telescopic guide tube 21 inside the compression ring 23. The push plate 25 has a hollowed-out locking hole 26, and a hollowed-out unlocking hole 27 is provided at the upper end of the locking hole 26. The locking hole 26 and the unlocking hole 27 are connected, and the size of the unlocking hole 27 is larger than the size of the compression ring 23. The telescopic guide tube 21 is fitted inside the locking hole 26. When the grouting pipe body 30 is not inserted into the outer guide tube 10, pushing the push plate 25 outward can push the compression ring 23 to move outward. When the push plate 25 is pressed downward, the push plate 25 moves downward, and the telescopic guide tube 21 moves with the push plate 25 and is fitted inside the unlocking hole 27. Since the unlocking hole 27 is large, the compression ring 23 passes through the unlocking hole 27. At this time, the push plate 25 will unlock, and the push plate 25 can no longer restrict or drive the telescopic guide tube 21 to move.

[0042] The inner side of the push plate 25 is fixed with a support bar 28. When the grouting pipe 31 is not inserted into the outer pipe 10, the support bars 28 of the two push plates 25 provide abutment support. When the grouting pipe 30 is not inserted into the outer pipe 10, the two push plates 25 abut against each other through the support bars 28 under the elastic force of the compression spring 24, and make the other side of the push plate 25 fit more tightly with the compression ring 23. Under the action of friction, there is no need to slide.

[0043] The grouting pipe body 30 includes a hollow grouting conduit 31. The surface of the grouting conduit 31 is provided with a grout outlet hole 32 that matches the telescopic conduit 21. The grout outlet hole 32 penetrates the side wall of the grouting conduit 31. Extrusion plates 33 are fixed on both sides of the grouting conduit 31. A lower pressure plate 34 is provided at the upper end of the extrusion plate 33. The width of the lower pressure plate 34 is greater than the width of the extrusion plate 33.

[0044] When the grouting pipe 30 is used, it is inserted into the outer guide tube 10. At this time, the squeezing plate 33 squeezes the pushing plate 25 to both sides. The pushing plate 25 moves the telescopic guide tube 21 outward, allowing the telescopic guide tube 21 to be inserted into the side walls on both sides of the grouting hole. When the grouting pipe 30 is continuously inserted into the outer guide tube 10, the lower pressure plate 34 touches the upper end of the pushing plate 25 and presses the pushing plate 25 downward. The squeezing ring 23 passes through the unlocking hole 27. At this time, the pushing plate 25 will unlock, and the pushing plate 25 can no longer restrict or drive the telescopic guide tube 21 to move.

[0045] Furthermore, the upper end of the outer conduit 10 is provided with a perforated groove, the shape of which matches the shape of the grouting pipe body 30. The upper end of the grouting conduit 31 is open and the lower end is sealed. When the grouting pipe body 30 is inserted into the interior of the outer conduit 10, the grouting conduit 31, the extrusion plate 33, and the lower pressure plate 34 are all inserted into the interior of the outer conduit 10 along the perforated groove. Since the extrusion plate 33 and the lower pressure plate 34 need to be inserted at the same time, the perforated groove also plays a limiting role to ensure that the grouting conduit 31 will not rotate or deviate.

[0046] When the grouting conduit 31 is inserted inside the outer conduit 10, and the bottom of the conduit 31 contacts the bottom of the outer conduit 10, that is, when the moving plate 53 is pushed to the point where it can no longer move, the inner port of the telescopic conduit 21 is located at the grout outlet 32, and at this time the telescopic conduit 21 and the grouting conduit 31 are connected internally.

[0047] Furthermore, the bottom of the extrusion plate 33 has a V-shaped structure, which facilitates the insertion of the extrusion plate 33 between the two push plates 25.

[0048] Furthermore, a sealing strip 29 is provided on the side where the telescopic conduit 21 and the grouting conduit 31 fit together, so that the telescopic conduit 21 and the grouting conduit 31 fit together more tightly.

[0049] The outer conduit 10 is fixed on the padding assembly 40. The padding assembly 40 includes an upper pad 41. The outer conduit 10 passes through the upper pad 41. A connecting screw 43 is fixed at the bottom of the upper pad 41. The bottom of the connecting screw 43 passes through the lower pad 42 and is connected to a fixing nut 44.

[0050] When in use, pre-drilled holes in the middle rock wall, insert the grouting pipe into the grouting holes in the middle rock wall, and connect the bolt 43 through the pre-drilled holes. After placing the upper and lower pads 42 on the other side of the middle rock wall, tighten the fixing nut 44. At this time, the upper pad 41 and the lower pad 42 are located on both sides of the middle rock wall, providing support for the middle rock wall from both sides.

[0051] The working principle of this invention is as follows: Before use, pre-set holes and grouting holes are drilled in the middle rock wall. The grouting pipe body 30 is inserted into the grouting hole, and the connecting screw 43 passes through the pre-set hole. After placing the upper and lower pads 42 on the other side of the middle rock wall, the fixing nut 44 is tightened.

[0052] The grouting pipe 30 is inserted into the outer guide tube 10 along the perforation groove. At this time, the extrusion plate 33 extrudes the push plate 25 to both sides. The push plate 25 moves the telescopic guide tube 21 outward, allowing the telescopic guide tube 21 to be inserted into the side walls on both sides of the grouting hole. When the grouting pipe 30 continues to be inserted into the outer guide tube 10, the lower pressure plate 34 touches the upper end of the push plate 25 and presses the push plate 25 downward. The extrusion ring 23 passes through the unlocking hole 27, and the push plate 25 will be unlocked.

[0053] The grouting pipe 30 is inserted into the outer guide tube 10, and the moving plate 53 is pressed down to open the four sets of hinged rods 51, which are then stuck inside the grouting hole and pushed into the soil layer to achieve the purpose of limiting the position.

[0054] After unlocking, the inner side of the telescopic guide tube 21 is pressed tightly against the grout outlet 32 ​​of the grouting guide tube 31 under the action of the compression spring 24. During grouting, grout is injected through the grouting guide tube 31. The grout flows into the telescopic guide tube 21 along the grout outlet 32 ​​and is discharged through the grouting hole 22. Grouting is carried out from the soft rock layer inside the middle rock wall of the tunnel with a small clearance.

[0055] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A grouting pipe for reinforcing rock walls in tunnels with small clearances, characterized in that, include: The outer conduit (10) is hollow inside, closed at the lower end, and has two sets of telescopic holes (11) symmetrically arranged on the side. Telescopic tube body (20), the telescopic tube body (20) includes a hollow telescopic conduit (21), the side wall of the telescopic conduit (21) is provided with a hollow grouting hole (22), the telescopic conduit (21) is set in the telescopic hole (11), the telescopic conduit (21) inside the outer conduit (10) is fixed with a compression ring (23), the telescopic conduit (21) is fitted with a compression spring (24), one end of the compression spring (24) abuts against the inner side wall of the outer conduit (10), and the other end abuts against the side of the compression ring (23); Grouting pipe body (30), the grouting pipe body (30) includes a hollow grouting conduit (31), the surface of the grouting conduit (31) is provided with a grout outlet hole (32) that matches the telescopic conduit (21), the grout outlet hole (32) penetrates the side wall of the grouting conduit (31), the grouting conduit (31) is fixed with extrusion plates (33) on both sides, the upper end of the extrusion plate (33) is provided with a lower pressure plate (34), the width of the lower pressure plate (34) is greater than the width of the extrusion plate (33), the bottom of the extrusion plate (33) has a V-shaped structure; A push plate (25) is fitted on the telescopic guide tube (21) inside the compression ring (23). The push plate (25) is provided with a hollowed-out locking hole (26). The upper end of the locking hole (26) is provided with a hollowed-out unlocking hole (27). The locking hole (26) and the unlocking hole (27) are connected, and the size of the unlocking hole (27) is larger than the size of the compression ring (23). When the grouting conduit (31) is inserted into the outer conduit (10), when the bottom of the conduit (10) is in contact with the bottom of the outer conduit (10), the inner port of the telescopic conduit (21) is located at the grout outlet (32), the extrusion plate (33) is stuck between the two push plates (25), and the lower pressure plate (34) is located at the upper end of the push plate (25); The inner side of the push plate (25) is fixed with a support strip (28). When the grouting conduit (31) is not inserted into the outer conduit (10), the support strip (28) of the two push plates (25) provides abutment support.

2. A grouting pipe for reinforcing rock walls in tunnels with small clearances according to claim 1, characterized in that: The outer conduit (10) is fixed on the padding assembly (40). The padding assembly (40) includes an upper pad (41). The outer conduit (10) passes through the upper pad (41). A connecting screw (43) is fixed at the bottom of the upper pad (41). The bottom of the connecting screw (43) passes through the lower pad (42) and is connected to a fixing nut (44).

3. A grouting pipe for reinforcing rock walls in tunnels with small clearances according to claim 1, characterized in that: The bottom of the outer conduit (10) is closed by a tensioning mechanism (50). The tensioning mechanism (50) includes a hinge rod (51) and a moving plate (53) that is locked inside the outer conduit (10). The moving plate (53) can move up and down inside the outer conduit (10). A hinge seat (52) is fixed at the bottom of the moving plate (53). There are four sets of hinge rods (51) that are hinged together. Both ends are respectively hinged to the hinge seat (52). The four hinge rods (51) are arranged in a diamond shape.

4. A grouting pipe for reinforcing rock walls in tunnels with small clearances according to claim 1, characterized in that: A sealing strip (29) is provided on the side where the telescopic conduit (21) and the grouting conduit (31) fit together.

5. A grouting pipe for reinforcing rock walls in tunnels with small clearances according to claim 1, characterized in that: The telescopic conduit (21) extends to one end outside the telescopic hole (11) and is conical.

6. A grouting pipe for reinforcing rock walls in tunnels with small clearances according to claim 1, characterized in that: The upper end of the outer conduit (10) is provided with a perforated groove, the shape of which matches the shape of the grouting pipe body (30). The upper end of the grouting conduit (31) is open and the lower end is sealed.

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