Novel tunnel advanced grouting small guide pipe

Abstract

The invention relates to the technical field of tunnel construction equipment, and provides a novel tunnel advanced grouting small guide pipe which comprises a retaining pipe, a plurality of through grooves are formed in the rear end of the retaining pipe, a plurality of overflow blocks and spacer blocks are slidably connected into the retaining pipe, and the peripheries of the outsides of the overflow blocks and the spacer blocks are slidably connected to the inner walls of the through grooves. A plurality of overflow holes are formed in the outer walls of the overflow blocks, the sealing assembly is arranged at the rear end of the retaining pipe and used for sealing the remaining through groove part after the overflow blocks and the spacer blocks are installed, and the assembling and disassembling assembly is arranged at the rear end of the retaining pipe and used for assembling and disassembling the remaining through groove part after the overflow blocks and the spacer blocks are installed. And the assembling and disassembling assembly is used for assembling and disassembling the retaining pipe and the sealing assembly. By means of the retaining pipes, the through grooves, the overflow blocks and the spacer blocks, a worker can adjust the number of the spacer blocks between every two adjacent overflow blocks according to needs, and therefore the worker can flexibly adjust the distance between the overflow holes in the advanced grouting guide pipe according to actual needs.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel construction equipment, in particular to a novel small tunnel advance grouting guide tube. Background Art

[0002] The small duct for tunnel advance grouting, also known as advance grouting pipe, grouting duct or grouting pipeline, is a device used for advance grouting in tunnel engineering. Advance grouting is a construction technology that reinforces the surrounding rock by injecting cement slurry, chemical slurry and other materials to prevent or control problems such as groundwater gushing and fissure seepage. The small duct system is usually used to reinforce or protect the surrounding rock before tunnel excavation, and is widely used especially in weak surrounding rock, broken zones and complex hydrological conditions.

[0003] The overflow holes on the advance grouting conduit are used to control the injection flow and overflow of the slurry. Therefore, the design and construction of the overflow hole spacing of the advance grouting conduit directly affect the grouting effect and stability of underground projects. Normally, the spacing of the overflow holes of the advance grouting conduit is generally between 1.5 meters and 3 meters. The specific value depends on factors such as surrounding rock conditions and grouting pressure. For softer or fissured surrounding rocks, the spacing may need to be reduced to ensure that the slurry can penetrate evenly and fill the cracks. In hard rock formations, the overflow hole spacing can be appropriately increased. However, the position of the overflow holes on the commonly used small tunnel advance grouting conduits is usually fixed, and the position of the overflow holes cannot be flexibly adjusted according to actual use needs, resulting in low flexibility in actual use and low applicability. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a novel small conduit for tunnel advance grouting, which solves the problem that the position of the overflow hole on the small conduit for tunnel advance grouting is fixed and cannot be adjusted.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a new type of tunnel advance grouting small conduit, including a holding tube, a plurality of through grooves are opened at the rear end of the holding tube, a plurality of overflow blocks and spacer blocks are slidably connected inside the holding tube, the outer peripheries of the plurality of overflow blocks and spacer blocks are slidably connected to the inner wall of the through groove, and the outer walls of the plurality of overflow blocks are opened with a plurality of overflow holes;

[0006] A closing component, which is arranged at the rear end of the retaining tube and is used to close the remaining through groove portion after the overflow block and the spacer block are installed;

[0007] An assembly and disassembly component is arranged at the rear end of the retaining tube and is used for installing and disassembling the retaining tube and the sealing component.

[0008] Preferably, the closing assembly includes a connecting tube, which is arranged at the rear end of the retaining tube, and a chamber is opened inside the connecting tube, a plurality of springs are fixedly connected to the rear wall of the chamber, and a plurality of springs are fixedly connected to abutment tubes at the front ends, and the front end of the abutment tube passes through the front wall of the connecting tube and abuts against the rear wall of the spacer block at the rear side.

[0009] Preferably, the assembly and disassembly component includes a fixing groove, a plurality of the fixing grooves are arranged on the outer periphery of the front end of the connecting tube, a plurality of the inner side walls of the fixing grooves are arranged with grooves, a plurality of fixing blocks are fixedly connected to the rear wall of the retaining tube, a plurality of the fixing blocks are clamped in the fixing groove, an annular groove is arranged on the outer periphery of the front side of the middle part of the connecting tube, a swivel is rotatably connected to the middle part of the annular groove, a plurality of plug-in blocks are fixedly connected to the front wall of the swivel, a plurality of the plug-in blocks are penetrated into the groove and clamped in the fixing block, a torsion spring is fixedly connected to the rear wall of the swivel, and a rear end of the torsion spring is fixedly connected to the rear wall of the annular groove.

[0010] Preferably, a tube head is fixedly connected to the front wall of the retaining tube, and a plurality of grooves are formed on the outer circumference of the tube head.

[0011] Preferably, the front and rear ends of the overflow blocks and the spacer blocks are each provided with a plurality of recessed holes, the inner front wall of the retaining tube is threadedly connected with a locking rod, and the rear ends of the plurality of locking rods pass through the plurality of recessed holes in sequence.

[0012] Preferably, a limiting ring is fixedly connected to the outer periphery of the rear end of the abutting tube, and the limiting ring is slidably connected to the inner wall of the chamber.

[0013] Preferably, a plurality of guide rods are fixedly connected to the inner rear wall of the chamber, the front ends of the plurality of guide rods all penetrate into the abutment tubes, and the plurality of springs are all arranged on the outer periphery of the guide rods.

[0014] Preferably, a sealing groove 1 is formed on both side walls of the through grooves, a sealing plate 1 is fixedly connected to both sides of the outer periphery of the overflow blocks and the spacer blocks, a plurality of sealing plates 1 are slidably connected in the sealing groove 1, a plurality of sealing grooves 2 are formed at the front and rear ends of the overflow blocks, a plurality of sealing plates 2 are fixedly connected to the front and rear ends of the spacer blocks, and a plurality of sealing plates 2 are snapped into the sealing groove 2.

[0015] Preferably, a slot is provided on the front wall of the abutting tube.

[0016] Preferably, evenly distributed anti-skid grooves are provided on the outer periphery of the swivel.

[0017] Working principle: In actual use, when it is necessary to adjust the spacing of the overflow holes 5 of the leading small catheter, the staff can slide the overflow block 3 and the spacer block 4 into the holding tube 1 in sequence, and adjust the number of the spacer blocks 4 between two adjacent overflow blocks 3 according to the needs. When the overflow block 3 and the spacer block 4 are installed, the staff can insert the connecting tube 8 into the rear end of the holding tube 1 and make the front end of the abutting tube 9 abut against the rear wall of the last overflow block 3 or the spacer block 4 in the holding tube 1. As the connecting tube 8 is inserted, the abutting tube 9 will move into the chamber 19. The spring 17 is activated and compressed, so that the spring 17 can push the abutting tube 9 to be tightened to ensure the closure of the retaining tube 1, and when the connecting tube 8 is installed, the swivel 11 can be rotated to drive the connected plug block 15 to rotate. When the plug block 15 is pulled out of the fixing groove 13 and retracted into the groove 14, the swivel 11 can be loosened when the fixing block 12 is inserted into the fixing groove 13, and under the action of the torsion spring 26, the plug block 15 is reset and stuck in the fixing block 12, so that the fixing block 12 can be limited to achieve the installation of the connecting tube 8.

[0018] The present invention provides a new type of small conduit for advanced grouting in tunnels. It has the following beneficial effects:

[0019] 1. The present invention uses the joint action of the retaining tube, the through groove, the overflow block and the spacer block. When it is necessary to adjust the spacing of the overflow holes of the advance small conduit, the staff can slide the overflow block and the spacer block into the retaining tube in sequence, and adjust the number of spacer blocks between two adjacent overflow blocks as needed, thereby facilitating the staff to flexibly adjust the spacing of the overflow holes on the advance grouting conduit according to actual needs.

[0020] 2. In the present invention, through the joint action of the connecting tube, the retaining tube, the abutting tube, the chamber and the spring, after the connecting tube is inserted into the rear end of the retaining tube, the front end of the abutting tube will abut against the rear wall of the last overflow block or the spacer block in the retaining tube, and the spring can push the abutting tube to tighten it to ensure that it can adapt to the remaining different sizes of the through groove on the retaining tube to achieve the sealing effect.

[0021] 3. The present invention, through the joint action of the ring groove, the rotating ring, the insert block, the fixed groove, the groove, the fixed block and the torsion spring, can retract the insert block into the groove by rotating the rotating ring. When the fixed block is inserted into the fixed groove, the rotating ring can be loosened to allow the insert block to be reset and snapped into the fixed block, thereby achieving the effect of facilitating the assembly and disassembly of the connecting pipe. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0023] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0024] Figure 3It is a schematic cross-sectional structure diagram of the connecting pipe in the present invention;

[0025] Figure 4 It is a schematic diagram of the structure of the retaining tube in the present invention;

[0026] Figure 5 It is a schematic diagram of the connection between the overflow block and the spacer block in the present invention;

[0027] Figure 6 It is a structural schematic diagram of the overflow block in the present invention;

[0028] Figure 7 It is a schematic diagram of the structure of the spacer block in the present invention.

[0029] Among them, 1. retaining tube; 2. through groove; 3. overflow block; 4. spacer block; 5. overflow hole; 6. pipe head; 7. slot; 8. connecting tube; 9. abutment tube; 10. ring groove; 11. swivel; 12. fixing block; 13. fixing groove; 14. groove; 15. insert block; 16. guide rod; 17. spring; 18. limit ring; 19. chamber; 20. sealing groove 1; 21. sealing plate 1; 22. sealing plate 2; 23. sealing groove 2; 24. concave hole; 25. locking rod; 26. torsion spring; 27. anti-slip groove; 28. slot. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the specification of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Please see attached Figure 1 , Attachment Figure 4 and attached Figure 5 An embodiment of the present invention provides a new type of small tunnel advance grouting catheter, including a retaining tube 1, a plurality of through grooves 2 are opened at the rear end of the retaining tube 1, a plurality of overflow blocks 3 and spacer blocks 4 are slidably connected inside the retaining tube 1, the plurality of overflow blocks 3 and spacer blocks 4 are slidably connected to the inner wall of the through groove 2 on all sides outside, and a plurality of overflow holes 5 are opened on the outer wall of the plurality of overflow blocks 3.

[0032] When it is necessary to adjust the distance between the overflow holes 5 on the advance small conduit, the staff can slide the overflow block 3 and the spacer block 4 into the retaining tube 1 in turn and make the outside of the overflow block 3 and the spacer block 4 slide into the through groove 2 respectively to realize the installation of the overflow block 3 and the spacer block 4. At this time, if it is necessary to increase the distance between the overflow holes 5, the number of spacer blocks 4 can be increased between the two overflow blocks 3, thereby increasing the distance between the two overflow blocks 3 to increase the distance between the two overflow holes 5. If it is necessary to reduce the distance between the overflow holes 5, the number of spacer blocks 4 between the two overflow blocks 3 can be reduced, thereby reducing the distance between the two overflow blocks 3 to reduce the distance between the two overflow holes 5. This makes it convenient for the staff to flexibly adjust the distribution of the overflow blocks 3 and the spacer blocks 4 in the retaining tube 1 according to the actual surrounding rock conditions and grouting pressure and other factors, so as to achieve the effect of being able to adjust the distance between the overflow holes 5 on the advance grouting conduit, thereby increasing the flexibility of the device.

[0033] Please see attached Figure 1 and attached Figure 3 , a closing component, which is arranged at the rear end of the holding tube 1, and is used to close the remaining portion of the through groove 2 after the overflow block 3 and the spacer block 4 are installed;

[0034] The closing assembly includes a connecting tube 8, which is arranged at the rear end of the retaining tube 1. The size of the connecting tube 8 is the same as that of the retaining tube 1. A chamber 19 is opened inside the connecting tube 8. A plurality of springs 17 are fixedly connected to the rear wall of the chamber 19. The front ends of the plurality of springs 17 are fixedly connected to abutment tubes 9. The front end of the abutment tubes 9 passes through the front wall of the connecting tube 8 and abuts against the rear wall of the rear spacer block 4.

[0035] When the overflow block 3 and the spacer block 4 are installed, the staff can install the connecting tube 8 at the rear end of the retaining tube 1. During the installation of the connecting tube 8, the abutting tube 9 will be inserted into the inner rear part of the retaining tube 1 first and the front end of the abutting tube 9 will abut the rear wall of the last overflow block 3 or the spacer block 4 in the retaining tube 1. When the front end of the abutting tube 9 abuts the rear wall of the overflow block 3 or the spacer block 4, as the connecting tube 8 is inserted, the abutting tube 9 will move toward the rear side of the chamber 19. When the abutting tube 9 moves backward, the spring 17 will be compressed. When the spring 17 is compressed, it will provide a reverse force, so that the spring 17 can push the abutting tube 9 to move forward and tighten to ensure that part of the through groove 2 at the rear of the retaining tube 1 is closed, thereby achieving the effect of closing the remaining part of the through groove 2 on the retaining tube 1 after an appropriate number of overflow blocks 3 and spacer blocks 4 are installed in the retaining tube 1 through the connecting tube 8 and the abutting tube 9.

[0036] Please see attached Figure 1 , Attachment Figure 2 and attached Figure 3, an assembly and disassembly component, which is arranged at the rear end of the holding tube 1 and is used to install and disassemble the holding tube 1 and the closing component;

[0037] The assembly and disassembly assembly includes a fixing groove 13, and multiple fixing grooves 13 are all opened on the outer periphery of the front end of the connecting tube 8. The multiple fixing grooves 13 are evenly distributed. The inner side walls of the multiple fixing grooves 13 are provided with grooves 14. The rear wall of the holding tube 1 is fixedly connected with multiple fixing blocks 12 matching the fixing grooves 13. One side of the fixing block 12 is provided with a notch suitable for the plug-in block 15. The multiple fixing blocks 12 are all engaged in the fixing groove 13. The outer periphery of the front side of the middle part of the connecting tube 8 is provided with an annular groove 10, and the annular groove 10 is connected with the multiple grooves 14. A swivel 11 is rotatably connected to the middle part of the annular groove 10, and a plurality of plug-in blocks 15 are fixedly connected to the front wall of the swivel 11. The number of the plug-in blocks 15 corresponds to the number of the fixed blocks 12, and the sizes of the plurality of plug-in blocks 15 match the size of the groove 14. The plurality of plug-in blocks 15 penetrate into the groove 14 and are engaged in the fixed block 12. A torsion spring 26 is fixedly connected to the rear wall of the swivel 11, and the rear end of the torsion spring 26 is fixedly connected to the rear wall of the annular groove 10. When the torsion spring 26 is in the initial pullable state, the plug-in block 15 is in the fixed groove 13.

[0038] By turning the swivel 11, the swivel 11 can be rotated in the annular groove 10. When the swivel 11 rotates, it can drive the connected multiple plug-in blocks 15 to rotate, so that the plug-in blocks 15 can be pulled out of the fixed groove 13 and moved into the groove 14. At the same time, when the swivel 11 rotates, it will also pull the connected torsion spring 26. When the torsion spring 26 is compressed and tensile, it will provide an opposite force. Therefore, after the swivel 11 is released, the torsion spring 26 will lose its tension. Therefore, under the action of the torsion spring 26, the swivel 11 can be pulled to rotate in the opposite direction, thereby driving the connected plug-in blocks 15 to reset.

[0039] The insert block 15 can be rotated to move out of the groove 14, and the limit of the fixing block 12 can be cancelled, so that the connecting tube 8 can be disassembled, thereby achieving the effect of facilitating the installation of the connecting tube 8.

[0040] Please see attached Figure 1A pipe head 6 is fixedly connected to the front wall of the holding pipe 1. The pipe head 6 is a conical head, and a plurality of grooves 7 are formed on the outer periphery of the pipe head 6.

[0041] The pipe head 6 with a conical head can facilitate the workers to insert the advanced grouting conduit, and the groove 7 can make the slurry entering the retaining pipe 1 flow out from the groove 7.

[0042] Please see attached Figure 5 , Attachment Figure 6 and attached Figure 7 A plurality of concave holes 24 are provided at the front and rear ends of the plurality of overflow blocks 3 and the spacer blocks 4, and a locking rod 25 is threadedly connected to the front wall of the retaining tube 1. The rear end size of the plurality of locking rods 25 is larger than the size of the rest of the locking rods 25, and the rear ends of the plurality of locking rods 25 pass through the plurality of concave holes 24 in sequence.

[0043] By providing a locking rod 25, after multiple overflow blocks 3 and spacer blocks 4 are inserted into the retaining tube 1, the locking rod 25 can be inserted into the recessed hole 24 on the rearmost overflow block 3 or spacer block 4, and then penetrate through the recessed holes 24 on the remaining overflow blocks 3 and spacer blocks 4 in turn and be screwed into the inner front wall of the retaining tube 1, thereby limiting the positioning of the overflow blocks 3 and spacer blocks 4 in the retaining tube 1.

[0044] Please see attached Figure 3 A limit ring 18 is fixedly connected to the outer periphery of the rear end of the abutment tube 9, and the limit ring 18 is slidably connected to the inner wall of the chamber 19.

[0045] The limiting ring 18 can be provided to limit the movement of the abutment tube 9 in the chamber 19 , thereby preventing the abutment tube 9 from being withdrawn from the chamber 19 .

[0046] Please see attached Figure 3 A plurality of guide rods 16 are fixedly connected to the rear wall of the chamber 19 , and the front ends of the plurality of guide rods 16 all penetrate into the abutment tube 9 . The interior of the abutment tube 9 is provided with a hole groove matching the size of the abutment tube 9 , and a plurality of springs 17 are arranged on the periphery of the guide rods 16 .

[0047] The guide rod 16 can limit the abutment tube 9 to ensure the stability of the movement of the abutment tube 9. At the same time, the guide rod 16 can also limit the spring 17 to prevent the spring 17 from bending when it is compressed, so as to ensure the normal use function of the spring 17.

[0048] Please see attached Figure 4 , Attachment Figure 6 and attached Figure 7A sealing groove 20 is formed on both side walls of the through grooves 2, a sealing plate 21 is fixedly connected to both sides of the outer periphery of the overflow blocks 3 and the spacer blocks 4, and the sealing plates 21 are slidably connected in the sealing groove 20, a plurality of sealing grooves 23 are formed at the front and rear ends of the overflow blocks 3, a plurality of sealing plates 22 are fixedly connected to the front and rear ends of the spacer blocks 4, and the plurality of sealing plates 22 are snapped into the sealing grooves 23.

[0049] By providing a sealing plate 21 and a sealing groove 20 in cooperation, when the overflow block 3 and the spacer block 4 are inserted into the retaining tube 1 in sequence, the sealing plate 21 corresponding to the overflow block 3 and the spacer block 4 will also slide into the sealing groove 20 to perform sealing treatment between the overflow block 3, the spacer block 4 and the through groove 2; by providing a sealing plate 22 and a sealing groove 23 in cooperation, after the overflow block 3 and the spacer block 4 slide into the retaining tube 1, the sealing plate 22 on the spacer block 4 will be inserted into the sealing groove 23 on the overflow block 3 and the spacer block 4 to increase the sealing between the spacer block 4 and the overflow block 3, thereby increasing the overall sealing of the tunnel advance grouting conduit and preventing the slurry from flowing out from the contact gap after injection.

[0050] Please see attached Figure 3 A slot 28 is provided on the front wall of the abutment tube 9 .

[0051] By providing a slot 28, when the abutting tube 9 abuts against the rear wall of the spacer block 4, the sealing plate 22 fixed on the rear wall of the spacer block 4 can be accommodated to ensure that the abutting tube 9 closes the through groove 2 on the retaining tube 1. At the same time, when the last block in the retaining tube 1 is the overflow block 3, the front wall of the abutting tube 9 can also make normal contact with the rear wall of the overflow block 3.

[0052] Please see attached Figure 1 and attached Figure 3 The outer periphery of the rotating ring 11 is provided with evenly distributed anti-skid grooves 27 .

[0053] By providing an anti-slip groove 27 on the outer periphery of the rotating ring 11, the friction force when the staff turns the rotating ring 11 can be increased, so that the staff can better adjust the rotating ring 11 for rotation, thereby improving the convenience of use.

[0054] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A novel small conduit for advanced tunnel grouting, comprising a retaining tube (1), characterized in that: The rear end of the retaining tube (1) is provided with a plurality of through grooves (2), the interior of the retaining tube (1) is slidably connected with a plurality of overflow blocks (3) and spacer blocks (4), the exteriors of the plurality of overflow blocks (3) and spacer blocks (4) are slidably connected to the inner wall of the through groove (2), and the outer walls of the plurality of overflow blocks (3) are provided with a plurality of overflow holes (5); A closing component, the closing component being arranged at the rear end of the retaining tube (1), and being used to close the portion of the through groove (2) remaining after the overflow block (3) and the spacer block (4) are installed; An assembly and disassembly component is arranged at the rear end of the retaining tube (1), and is used to assemble and disassemble the retaining tube (1) and the sealing component.

2. A new type of tunnel advance grouting small conduit according to claim 1, characterized in that: The sealing component comprises a connecting tube (8), the connecting tube (8) being arranged at the rear end of the retaining tube (1), the connecting tube (8) being provided with a chamber (19) inside, a plurality of springs (17) being fixedly connected to the rear wall inside the chamber (19), the front ends of the plurality of springs (17) being fixedly connected to abutment tubes (9), the front ends of the abutment tubes (9) penetrating the front wall of the connecting tube (8) and abutting against the rear wall of the spacer block (4) at the rear side.

3. A new type of tunnel advance grouting small conduit according to claim 1, characterized in that: The assembly and disassembly component comprises a fixing groove (13), wherein a plurality of the fixing grooves (13) are arranged on the outer periphery of the front end of the connecting tube (8), and a plurality of grooves (14) are arranged on the inner side walls of the fixing grooves (13). A plurality of fixing blocks (12) are fixedly connected to the rear wall of the retaining tube (1), and the plurality of fixing blocks (12) are all engaged in the fixing groove (13). An annular groove (10) is arranged on the outer periphery of the front side of the middle part of the connecting tube (8), and a rotating ring (11) is rotatably connected to the middle part of the annular groove (10). A plurality of insert blocks (15) are fixedly connected to the front wall of the rotating ring (11), and the plurality of insert blocks (15) are all inserted into the groove (14) and engaged in the fixing block (12). A torsion spring (26) is fixedly connected to the rear wall of the rotating ring (11), and the rear end of the torsion spring (26) is fixedly connected to the inner rear wall of the annular groove (10).

4. A new type of tunnel advance grouting small conduit according to claim 1, characterized in that: A tube head (6) is fixedly connected to the front wall of the retaining tube (1), and a plurality of slots (7) are formed on the outer circumference of the tube head (6).

5. The novel small conduit for advanced tunnel grouting according to claim 1 is characterized in that: A plurality of concave holes (24) are provided at the front and rear ends of the plurality of overflow blocks (3) and the spacer blocks (4); a locking rod (25) is threadedly connected to the inner front wall of the retaining tube (1); and the rear ends of the plurality of locking rods (25) pass through the plurality of concave holes (24) in sequence.

6. A new type of tunnel advance grouting small conduit according to claim 2, characterized in that: A limiting ring (18) is fixedly connected to the outer periphery of the rear end of the abutting tube (9), and the limiting ring (18) is slidably connected to the inner wall of the chamber (19).

7. The novel small conduit for advanced tunnel grouting according to claim 2 is characterized in that: A plurality of guide rods (16) are fixedly connected to the inner rear wall of the chamber (19), the front ends of the plurality of guide rods (16) all penetrate into the abutment tube (9), and the plurality of springs (17) are all arranged on the outer periphery of the guide rods (16).

8. The novel small conduit for advanced tunnel grouting according to claim 1 is characterized in that: The inner side walls of the plurality of through grooves (2) are each provided with a sealing groove (20); the outer sides of the plurality of overflow blocks (3) and the spacer blocks (4) are each fixedly connected with a sealing plate (21); the plurality of sealing plates (21) are each slidably connected in the sealing groove (20); the front and rear ends of the plurality of overflow blocks (3) are each provided with a plurality of sealing grooves (23); the front and rear ends of the plurality of spacer blocks (4) are each fixedly connected with a plurality of sealing plates (22); the plurality of sealing plates (22) are each snap-fitted in the sealing grooves (23).

9. The novel small conduit for advanced tunnel grouting according to claim 2 is characterized in that: A slot (28) is provided on the front wall of the abutment tube (9).

10. The novel small conduit for advanced tunnel grouting according to claim 3 is characterized in that: The outer periphery of the rotating ring (11) is provided with evenly distributed anti-slip grooves (27).

Images