Progressive segmented grouting conduit

Abstract

The application provides a gradual segmented grouting guide pipe, belonging to the technical field of tunnel water blocking construction, comprising an inner pipe (11) and an outer pipe (12) which are mutually sleeved; the inner pipe (11) and the outer pipe (12) can move along the direction of the axis; the pipe wall of the inner pipe (11) and the outer pipe (12) is respectively provided with an inner grouting hole (13) and an outer grouting hole (14); by using the gradual segmented grouting guide pipe, sectional grouting in the fissure can be realized, and the sequential sectional grouting from the small water gushing place to the large water gushing place, from the scattered water outlet point to the concentrated water outlet point, and from the side wall to the arch part is adopted. The sectional grouting can implement the restrained grouting, and the purposes of grouting water blocking and reinforcement are achieved.

Description

Technical Field

[0001] This invention belongs to the field of tunnel water plugging construction technology, and more specifically relates to a progressive segmented grouting conduit. Background Technology

[0002] Groundwater poses numerous adverse effects on tunnel construction, primarily impacting tunnel stability. High groundwater levels can reduce tunnel stability and even lead to collapse. It also increases construction difficulty, requiring continuous drainage to ensure smooth progress. This not only increases construction costs but also prolongs the construction period. Furthermore, the presence of groundwater may increase safety risks during tunnel construction, such as collapses caused by groundwater erosion and the leakage of harmful substances from the groundwater.

[0003] In existing technologies, some tunnel construction projects utilize advanced geological exploration techniques to detect geological information ahead of the construction face. In cases where groundwater is present, it is usually necessary to treat the groundwater before continuing tunnel construction. The process of treating groundwater typically involves drilling to drain the groundwater and then grouting to seal these seepage fissures.

[0004] In some existing grouting processes, cracks are sealed by injecting concrete grout into them. The current method involves inserting a pipe into the crack, with multiple through holes on the side of the pipe. Grout is injected into the pipe, and the concrete grout seeps out from these through holes, ultimately sealing the crack.

[0005] However, such grouting methods are ineffective for complex cracks, such as those with multiple diffused and concentrated water outlets, characterized by numerous outlets and large water flow rates. Conventional grouting techniques fail to effectively stop the water flow and cannot achieve the desired reinforcement. Summary of the Invention

[0006] Based on this, the purpose of the present invention is to provide a progressive segmented grouting conduit for grouting and plugging water in water-rich fissures in tunnels; the grouting conduit includes an inner pipe and an outer pipe that are nested together; the inner pipe and the outer pipe can move relative to each other along the axial direction; the inner pipe and the outer pipe are respectively provided with an inner grout outlet hole and an outer grout outlet hole on their pipe walls.

[0007] When the inner and outer pipes move relative to each other along the axis to the first slurry outlet position, a portion of the inner slurry outlets correspond to and are interconnected with the outer slurry outlets; when the inner and outer pipes move relative to each other along the axis to the second slurry outlet position, another portion of the inner slurry outlets correspond to and are interconnected with the outer slurry outlets.

[0008] The front end of the grouting conduit first extends into the fissure, and the rear end of the grouting conduit is used to inject grout into the grouting conduit; by adjusting the relative position of the inner and outer conduits, grout can be injected into one segment of the fissure, and by readjusting the relative position of the inner and outer conduits, grout can be injected into another segment of the fissure.

[0009] Preferably, when the inner and outer pipes are moved relative to each other along the axis to the first grout outlet position, the inner grout outlet hole on the front side of the grouting conduit corresponds to and is connected to the outer grout outlet hole; when the inner and outer pipes are moved relative to each other along the axis to the second grout outlet position, the inner grout outlet hole on the rear side of the grouting conduit corresponds to and is connected to the outer grout outlet hole.

[0010] Preferably, a limiting element is provided at the rear end of the inner pipe, and a limiting groove is provided at the corresponding position of the outer pipe, with the length direction of the limiting groove parallel to the axial direction of the grouting pipe.

[0011] When the inner and outer pipes move relative to each other along the axis, the limiting component moves within the limiting groove; when the limiting component moves to one end of the limiting groove, the inner and outer pipes move relative to each other along the axis to the first slurry outlet position; when the limiting component moves to the other end of the limiting groove, the inner and outer pipes move relative to each other along the axis to the second slurry outlet position.

[0012] The limiting element and the limiting groove can also be used to limit the relative movement between the inner and outer pipes to relative movement along the axial direction and not relative rotation.

[0013] Preferably, the rear end of the inner pipe is provided with an inner positioning hole, and the rear end of the outer pipe is provided with two outer positioning holes, with positioning elements provided inside the inner and outer positioning holes;

[0014] When the inner and outer pipes move to the first slurry outlet position, the inner positioning hole corresponds to the position of one outer positioning hole; when the inner and outer pipes move to the second slurry outlet position, the inner positioning hole corresponds to the position of another outer positioning hole.

[0015] Passing the positioning element through the inner and outer positioning holes can restrict the relative movement between the inner and outer pipes.

[0016] Preferably, the inner grout outlet is provided with a sealing plug, which is used to seal the inner grout outlet when the positions of the inner grout outlet and the outer grout outlet do not correspond, so as to prevent concrete grout from being injected between the inner and outer pipes.

[0017] Preferably, the inner slurry outlet is a conical hole; the diameter of the inner slurry outlet on the inner side of the inner pipe is smaller than the diameter on the outer side of the inner pipe; the circumferential surface of the sealing plug is conical and matches the shape of the inner slurry outlet.

[0018] The conical sealing plug and the inner grout outlet are used to prevent the sealing plug from falling into the inner layer of the pipe. When the inner grout outlet corresponds to the outer grout outlet, grouting into the grouting pipe can push the sealing plug out of the inner grout outlet and through the outer grout outlet, and finally out of the grouting pipe with the concrete grout.

[0019] Preferably, the end of the sealing plug near the outer side of the inner pipe is an arc surface;

[0020] When the inner and outer pipes move relative to each other, the arc surface of the sealing plug contacts the inner wall of the outer pipe to reduce the friction between the sealing plug and the outer pipe.

[0021] Preferably, a sealing assembly is provided on the outer side of the outer pipe, the sealing assembly including an extension body sleeved on the outer wall of the outer pipe and a ring clamp for fixing the extension body to the outer wall of the outer pipe;

[0022] The extension body is located outside an outgoing grout hole. The outgoing grout hole inside the extension body corresponds to the position of the inner grout hole. When grout is injected outward, the concrete grout is poured into the extension body, causing the extension body to expand. The extension body can contact the inner wall of the crack at its location. The expanded extension body is used to prevent the concrete grout from flowing in the crack channel.

[0023] Preferably, the grouting conduit includes two sealing components, one sealing component is disposed in the middle of the grouting conduit, and the other sealing component is disposed at the rear end of the grouting conduit;

[0024] Grouting is performed when the inner and outer pipes move to the first grout outlet position. Grouting is performed outward from the corresponding positions of the inner grout outlet and the outer grout outlet between the middle sealing component and the front end of the grouting pipe, and the extension body of the middle sealing component expands.

[0025] Grouting is performed when the inner and outer pipes move to the second grout outlet position. The inner grout outlet and the outer grout outlet positions of the sealing component in the middle and the sealing component at the rear end of the grouting conduit correspond to the grout outlet positions and grouting outwards, and the extension body of the sealing component at the rear end of the conduit expands.

[0026] Preferably, the sealing components on the inner pipe are provided with sealing grooves at both ends, and sealing rings are provided in the sealing grooves. The sealing rings seal the gap between the inner pipe and the outer pipe to prevent the concrete slurry inside the extension body from flowing back into the space between the inner pipe and the outer pipe after the extension body expands.

[0027] According to an embodiment of the present invention, a progressive segmented grouting conduit is capable of segmented grouting in cracks, employing a sequential grouting approach from small water inflow points to large water inflow points, from diffused water outlets to concentrated water outlets, and from sidewalls to arches. Segmented grouting enables constrained grouting, achieving the purpose of grouting to plug water and reinforce the structure. Attached Figure Description

[0028] This disclosure includes accompanying drawings, which are to be considered included in and form part of the specification, and together with the specification illustrate various exemplary embodiments, features, and aspects of the disclosure and serve to explain the principles of the disclosure. The invention will be more fully understood from the following detailed description taken in conjunction with the accompanying drawings. Wherein:

[0029] Figure 1 This is a schematic diagram of a progressive segmented grouting conduit according to an embodiment of the present invention;

[0030] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0031] Figure 3 This is a cross-sectional view of a progressive segmented grouting conduit according to an embodiment of the present invention;

[0032] Figure 4 yes Figure 3 A magnified view of a section at point A in the middle;

[0033] Figure 5 yes Figure 3 A magnified view of a section at point B in the middle;

[0034] Among them: inner pipe 11, outer pipe 12, inner slurry outlet 13, outer slurry outlet 14, tip 15, adjusting ring 16, limiting component 21, limiting groove 22, positioning hole 23, positioning component 24, sealing plug 31, extension body 32, ring hoop 33, sealing ring 34. Detailed Implementation

[0035] The technical solution of the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings, but the present invention is not limited to the following embodiments.

[0036] In some tunnel construction projects, advanced geological exploration technology is used to detect geological information ahead of the construction face. In cases where groundwater is present, it is usually necessary to treat the groundwater before continuing tunnel construction. The process of treating groundwater typically involves drilling to drain the groundwater and then grouting to seal these seepage fissures. Some existing grouting techniques seal these fissures by injecting concrete grout into them. Current methods involve inserting a pipe into the fissure, with multiple through-holes on the side of the pipe. Grout is injected into the pipe, and the concrete grout seeps out through these through-holes, ultimately sealing the fissure.

[0037] However, such grouting methods are ineffective for complex cracks, such as those with multiple diffused and concentrated water outlets, characterized by numerous outlets and large water flow rates. Conventional grouting techniques fail to effectively stop the water flow and cannot achieve the desired reinforcement.

[0038] To address the aforementioned problems, the present invention aims to provide a progressive segmented grouting conduit for grouting and plugging water in water-rich fissures of tunnels. The grouting conduit includes an inner pipe 11 and an outer pipe 12 that are nested together. The inner pipe 11 and the outer pipe 12 are capable of moving relative to each other along the axial direction. The inner pipe 11 and the outer pipe 12 are respectively provided with an inner grout outlet hole 13 and an outer grout outlet hole 14 on their pipe walls.

[0039] When the inner pipe 11 and the outer pipe 12 move relative to each other along the axis to the first slurry outlet position, a portion of the inner slurry outlet holes 13 correspond to and communicate with the outer slurry outlet holes 14; when the inner pipe 11 and the outer pipe 12 move relative to each other along the axis to the second slurry outlet position, another portion of the inner slurry outlet holes 13 correspond to and communicate with the outer slurry outlet holes 14.

[0040] The front end of the grouting conduit extends into the fissure first, and the rear end of the grouting conduit is used to inject grout into the grouting conduit; by adjusting the relative position of the inner pipe 11 and the outer pipe 12, grout can be injected into one segment of the fissure, and by adjusting the relative position of the inner pipe 11 and the outer pipe 12 again, grout can be injected into another segment of the fissure.

[0041] The outer conduit has a tip 15 at its front end, which allows it to easily penetrate into the fissure.

[0042] In this embodiment, as Figure 1 , Figure 3 As shown, it includes an inner pipe 11 and an outer pipe 12 that are nested together. Both the inner pipe 11 and the outer pipe 12 are hollow cylindrical shapes. The grouting conduit includes a front end and a rear end. The front end is the end that first extends into the crack, and the rear end is used to inject grout into the cavity of the inner pipe 11. Grouting refers to injecting concrete slurry.

[0043] In some embodiments, the grouting conduit is for single use only and cannot be reused. The grouting conduit is placed into the fissure, and after grouting is injected into the fissure, the grouting conduit is not removed and remains inside the rock wall.

[0044] In some embodiments, the axes of the inner slurry outlet 13 and the outer slurry outlet 14 on the pipe walls of the inner pipe 11 and the outer pipe 12 are parallel to the radial direction of the inner pipe 11 or the outer pipe 12; the axes of the inner pipe 11 and the outer pipe 12 are collinear.

[0045] One or more internal grout outlet holes 13 and external grout outlet holes 14 can be provided on the axial cross-section of the inner pipe 11 and the outer pipe 12. When the internal grout outlet holes 13 and external grout outlet holes 14 are staggered, the concrete grout inside the inner pipe 11 cannot be output to the outside of the grouting pipe. When the grouting pipe is inserted into the crack, the internal grout outlet holes 13 and external grout outlet holes 14 can be staggered. After the grouting pipe is inserted into place, it is adjusted to the first grout outlet position, and then grouting is performed.

[0046] In this embodiment, as Figure 2 As shown, the end of the inner pipe 11 at the rear end of the grouting conduit protrudes beyond the end of the outer pipe 12. An adjusting ring 16 is fixedly connected to the protruding inner pipe 11. The function of the adjusting ring 16 is to facilitate the adjustment of the relative position of the inner pipe 11 and the outer pipe 12.

[0047] In practice, a hydraulically driven tool can be installed between the adjusting ring 16 and the end of the outer pipe 12 to adjust the relative position of the inner pipe 11 and the outer pipe 12. If the crack size is large, the grouting pipe can be directly inserted into the crack. If the crack size is small, a hole can be drilled and enlarged before inserting the grouting pipe into the hole.

[0048] Furthermore, when the inner pipe 11 and the outer pipe 12 are moved relative to each other along the axis to the first grout outlet position, the inner grout outlet 13 on the front side of the grouting conduit corresponds to and communicates with the outer grout outlet 14; when the inner pipe 11 and the outer pipe 12 are moved relative to each other along the axis to the second grout outlet position, the inner grout outlet 13 on the rear side of the grouting conduit corresponds to and communicates with the outer grout outlet 14.

[0049] This embodiment proposes a method for arranging the internal grout outlet 13 and the external grout outlet 14 in a segmented grouting manner using a grouting conduit, such as... Figure 3 As shown, Figure 3 The grouting conduit is in its initial state. In the initial state, the inner grout outlet 13 and the outer grout outlet 14 are staggered. The outer grout outlet 14 on the front side of the grouting conduit is located in front of the inner grout outlet 13; the outer grout outlet 14 on the rear side of the grouting conduit is located behind the inner grout outlet 13. When the inner conduit 11 is pushed forward to the first grout outlet position, the inner grout outlet 13 and the outer grout outlet 14 on the front side of the grouting conduit are positioned correspondingly and interconnected, allowing concrete grout from the inner conduit 11 to exit from the front side. When the inner conduit 11 is pushed backward to the second grout outlet position, the inner grout outlet 13 and the outer grout outlet 14 on the rear side of the grouting conduit are positioned correspondingly and interconnected, allowing concrete grout from the inner conduit 11 to exit from the rear side.

[0050] In the actual implementation process, the order of grouting is determined according to the actual situation. Grouting can be started from the rear side of the grouting pipe or from the front side of the grouting pipe.

[0051] Furthermore, a limiting member 21 is provided at the rear end of the inner pipe 11, and a limiting groove 22 is provided at the corresponding position of the outer pipe 12. The length direction of the limiting groove 22 is parallel to the axial direction of the grouting pipe.

[0052] When the inner pipe 11 and the outer pipe 12 move relative to each other along the axis, the limiting member 21 moves within the limiting groove 22; when the limiting member 21 moves to one end of the limiting groove 22, the inner pipe 11 and the outer pipe 12 move relative to each other along the axis to the first slurry outlet position; when the limiting member 21 moves to the other end of the limiting groove 22, the inner pipe 11 and the outer pipe 12 move relative to each other along the axis to the second slurry outlet position.

[0053] The limiting member 21 and the limiting groove 22 can also be used to limit the relative movement between the inner pipe 11 and the outer pipe 12 to relative movement along the axial direction and not relative rotation.

[0054] In this embodiment, as Figure 2 As shown, the limiting member 21 can be a positioning pin. In this embodiment, the limiting member 21 is a bolt. The inner pipe 11 is provided with a matching threaded hole. The bolt is screwed into the threaded hole and passes through the limiting groove 22 on the outer pipe 12. In this embodiment, the limiting groove 22 is a slotted hole. Moving the inner pipe 11 and the outer pipe 12 allows the limiting member 21 to move within the limiting groove 22. The two ends of the limiting groove 22 correspond to the first slurry outlet position and the second slurry outlet position, respectively.

[0055] Furthermore, the rear end of the inner pipe 11 is provided with an inner positioning hole 23, and the rear end of the outer pipe 12 is provided with two outer positioning holes 23. Positioning elements 24 are provided inside the inner positioning hole 23 and the outer positioning hole 23.

[0056] When the inner pipe 11 and the outer pipe 12 move to the first slurry outlet position, the inner positioning hole 23 corresponds to the position of one outer positioning hole 23; when the inner pipe 11 and the outer pipe 12 move to the second slurry outlet position, the inner positioning hole 23 corresponds to the position of another outer positioning hole 23.

[0057] Passing the positioning element 24 through the inner positioning hole 23 and the outer positioning hole 23 can restrict the relative movement between the inner pipe 11 and the outer pipe 12.

[0058] In this embodiment, the inner positioning hole 23 and the outer positioning hole 23 are used to fix the relative positions of the inner pipe 11 and the outer pipe 12 after the inner pipe 11 and the outer pipe 12 are adjusted into place. The positioning element 24 in this embodiment is a bolt, the inner positioning hole 23 is a threaded hole that matches the bolt, and the outer positioning hole 23 is a through hole that matches the bolt.

[0059] When the inner pipe 11 and the outer pipe 12 move to the first slurry outlet position, the inner positioning hole 23 corresponds to the position of the outer positioning hole 23 on the front side; when the inner pipe 11 and the outer pipe 12 move to the second slurry outlet position, the inner positioning hole 23 corresponds to the position of the outer positioning hole 23 on the rear side.

[0060] In the specific implementation process, before the grouting begins, the relative position between the inner pipe 11 and the outer pipe 12 can be fixed by the positioning component 24, so that the grouting generates pressure and thus causes the relative position between the inner pipe 11 and the outer pipe 12 to move.

[0061] Furthermore, a sealing plug 31 is provided on the inner grout outlet 13. The sealing plug 31 is used to seal the inner grout outlet 13 when the positions of the inner grout outlet 13 and the outer grout outlet 14 do not correspond, so as to prevent concrete grout from being injected between the inner pipe 11 and the outer pipe 12.

[0062] In this embodiment, as Figure 3 , Figure 4 as well as Figure 5 As shown, the sealing plug 31 is used to occupy the space of the inner grout outlet 13 to prevent concrete grout from blocking the inner grout outlet 13. In addition, the sealing plug 31 can also be used to seal the inner grout outlet 13 when the positions of the inner grout outlet 13 and the outer grout outlet 14 do not correspond, to prevent concrete grout from being injected between the inner pipe 11 and the outer pipe 12.

[0063] Furthermore, the inner slurry outlet 13 is a conical hole; the diameter of the inner slurry outlet 13 inside the inner layer pipe 11 is smaller than the diameter outside the inner layer pipe 11; the circumferential surface of the sealing plug 31 is a cone shape that matches the shape of the inner slurry outlet 13.

[0064] The conical sealing plug 31 and the inner grout outlet 13 are used to prevent the sealing plug 31 from falling into the inner pipe 11. When the inner grout outlet 13 corresponds to the outer grout outlet 14, grouting into the grouting pipe can push the sealing plug 31 out of the inner grout outlet 13 and through the outer grout outlet 14, and finally out of the grouting pipe with the concrete grout.

[0065] In some embodiments, the inner grout outlet 13 and the sealing plug 31 are conical. The conical sealing plug 31 will not fall into the inner pipe 11, but can only be pushed to the outside of the grouting conduit by the pressure generated by the concrete grout. When the inner grout outlet 13 and the outer grout outlet 14 are not aligned, even if the concrete grout generates pressure, the sealing plug 31 will be blocked by the outer pipe 12 and will not be pushed to the outside of the grouting conduit.

[0066] Furthermore, the end of the sealing plug 31 near the outer side of the inner pipe 11 is an arc surface;

[0067] When the inner pipe 11 and the outer pipe 12 move relative to each other, the arc surface of the sealing plug 31 contacts the inner wall of the outer pipe 12 to reduce the friction between the sealing plug 31 and the outer pipe 12.

[0068] In some embodiments, such as Figure 4 , Figure 5 As shown, the end of the sealing plug 31 near the outer side of the inner pipe 11 is an arc surface. The arc surface of the sealing plug 31 is in point contact with the inner wall of the outer pipe 12. Therefore, the arc surface of the sealing plug 31 can reduce the friction between the sealing plug 31 and the outer pipe 12.

[0069] Furthermore, a sealing assembly is provided on the outer side of the outer pipe 12. The sealing assembly includes an extension body 32 sleeved on the outer wall of the outer pipe 12 and a ring 33 that fixes the extension body 32 to the outer wall of the outer pipe 12.

[0070] The extension body 32 is located outside an outgoing grout hole 14. The outgoing grout hole 14 inside the extension body 32 corresponds to the position of the inner grout hole 13. When grout is injected outward, the concrete grout is poured into the extension body 32, causing the extension body 32 to expand. The extension body 32 can contact the inner wall of the crack at its location. The expanded extension body 32 is used to prevent the concrete grout from flowing in the crack channel.

[0071] In this embodiment, as Figure 5 As shown, the extended body 32 can be a flexible film. Concrete grout is injected into the extended body 32 through the inner grout outlet 13 and the outer grout outlet 14. The extended body 32 expands and contacts the rock wall of the fissure or the inner wall of a manually drilled drainage hole. The grouting pressure keeps the extended body 32 in an expanded state. The expanded extended body 32 prevents the concrete grout from flowing within the fissure channel. The flow of concrete grout output from the grouting conduit within the fissure is blocked by the expanded extended body 32, thus grouting can only be carried out within a certain range, achieving segmented grouting.

[0072] In this embodiment, the hoop 33 can be a metal wire wrapped around both ends of the extension body 32, or it can be an elastic rope that binds the extension body 32 to the outer pipe 12.

[0073] In the specific implementation process, the extension body 32 does not need to retract after expansion. After the grouting conduit is placed in place and grouting begins, the outer pipe 12 cannot be moved. The grouting position can be switched by moving the inner pipe 11.

[0074] Furthermore, the grouting conduit includes two sealing components, one sealing component is located in the middle of the grouting conduit, and the other sealing component is located at the rear end of the grouting conduit;

[0075] When the inner pipe 11 and the outer pipe 12 move to the first grout outlet position, grouting is performed. The inner grout outlet 13 between the middle sealing component and the front end of the grouting pipe corresponds to the outer grout outlet 14 position and grouting is performed outward. The extension body 32 of the middle sealing component expands.

[0076] When the inner pipe 11 and the outer pipe 12 move to the second grout outlet position, grouting is performed. The inner grout outlet 13 and the outer grout outlet 14 between the middle sealing component and the sealing component at the rear end of the grouting conduit are positioned to grout outwards, and the extension body 32 of the sealing component at the rear end of the conduit expands.

[0077] In this embodiment, the grouting conduit has two grout outlet sections. One grout outlet section is located at the front of the grouting conduit corresponding to the first grout outlet position. The other grout outlet section is located at the rear of the grouting conduit corresponding to the second grout outlet position. Two sealing assemblies are provided for the grouting conduit with the two grout outlet sections. One sealing assembly is located in the middle of the two grout outlet sections, and the other sealing assembly is located at the rear end of the rear grout outlet section.

[0078] The first sealing component is used to allow concrete grout to flow to the rear grouting section during grouting at the front grouting section. The second sealing component is used to allow concrete grout to flow to the outside of the crack during grouting at the rear grouting section.

[0079] Furthermore, sealing grooves are provided at both ends of the sealing component on the inner pipe 11 at the corresponding positions, and sealing rings 34 are provided in the sealing grooves. The sealing rings 34 seal the gap between the inner pipe 11 and the outer pipe 12 to prevent the concrete slurry inside the extension body 32 from flowing back into the space between the inner pipe 11 and the outer pipe 12 after the extension body 32 expands.

[0080] In this embodiment, as Figure 5 As shown, the sealing ring 34 can be a rubber ring. The grouting pressure of the inner grout outlet 13 and the outer grout outlet 14 of the extended body 32 in the expanded state is very high. The concrete grout may flow between the inner pipe 11 and the outer pipe 12. The sealing ring 34 is used to seal the gap between the inner pipe 11 and the outer pipe 12.

[0081] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, and the scope of the present invention is not limited to the embodiments described above. Many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. That is, those skilled in the art can make various changes and improvements to the present invention in form and detail, and all of these are considered to fall within the protection scope of the present invention. The terminology used herein is chosen to best explain the principles, practical applications, or improvements to the technology in the market of the various embodiments, or to enable those skilled in the art to understand the embodiments disclosed herein.

Claims

1. A progressive segmented grouting conduit for grouting and plugging water in water-rich fissures of tunnels; characterized in that: The grouting conduit includes an inner pipe (11) and an outer pipe (12) that are nested together; the inner pipe (11) and the outer pipe (12) can move relative to each other along the axial direction; the inner pipe (11) and the outer pipe (12) are respectively provided with an inner grout outlet (13) and an outer grout outlet (14) on their pipe walls. When the inner pipe (11) and the outer pipe (12) move relative to each other along the axis to the first slurry outlet position, a portion of the inner slurry outlet (13) corresponds to and is connected to the outer slurry outlet (14); when the inner pipe (11) and the outer pipe (12) move relative to each other along the axis to the second slurry outlet position, another portion of the inner slurry outlet (13) corresponds to and is connected to the outer slurry outlet (14). The front end of the grouting conduit first extends into the crack, and the rear end of the grouting conduit is used to inject grout into the grouting conduit; by adjusting the relative position of the inner pipe (11) and the outer pipe (12), grout can be injected into one segment of the crack, and by adjusting the relative position of the inner pipe (11) and the outer pipe (12) again, grout can be injected into another segment of the crack; The inner grout outlet (13) is provided with a sealing plug (31). The sealing plug (31) is used to seal the inner grout outlet (13) when the positions of the inner grout outlet (13) and the outer grout outlet (14) do not correspond, so as to prevent concrete grout from being injected between the inner pipe (11) and the outer pipe (12). The inner slurry outlet (13) is a conical hole; the diameter of the inner slurry outlet (13) inside the inner layer pipe (11) is smaller than the diameter outside the inner layer pipe (11); the circumferential surface of the sealing plug (31) is a cone shape that matches the shape of the inner slurry outlet (13); The conical sealing plug (31) and the inner grout outlet (13) are used to prevent the sealing plug (31) from falling into the inner pipe (11). When the inner grout outlet (13) corresponds to the outer grout outlet (14), grouting into the grouting pipe can push the sealing plug (31) out of the inner grout outlet (13) and through the outer grout outlet (14), and finally out of the grouting pipe with the concrete grout.

2. The progressive segmented grouting conduit according to claim 1, characterized in that: When the inner pipe (11) and the outer pipe (12) move relative to each other along the axis to the first grout outlet position, the inner grout outlet (13) on the front side of the grouting conduit corresponds to and is connected to the outer grout outlet (14); when the inner pipe (11) and the outer pipe (12) move relative to each other along the axis to the second grout outlet position, the inner grout outlet (13) on the rear side of the grouting conduit corresponds to and is connected to the outer grout outlet (14).

3. A progressive segmented grouting conduit according to claim 1 or 2, characterized in that: A limiting element (21) is provided at the rear end of the inner pipe (11), and a limiting groove (22) is provided at the corresponding position of the outer pipe (12). The length direction of the limiting groove (22) is parallel to the axial direction of the grouting pipe. When the inner pipe (11) and the outer pipe (12) move relative to each other along the axis, the limiting member (21) moves within the limiting groove (22); when the limiting member (21) moves to one end of the limiting groove (22), the inner pipe (11) and the outer pipe (12) move relative to each other along the axis to the first slurry outlet position; when the limiting member (21) moves to the other end of the limiting groove (22), the inner pipe (11) and the outer pipe (12) move relative to each other along the axis to the second slurry outlet position. The limiting element (21) and the limiting groove (22) can also be used to limit the relative movement between the inner pipe (11) and the outer pipe (12) to relative movement along the axial direction and not relative rotation.

4. A progressive segmented grouting conduit according to claim 1 or 2, characterized in that: The inner pipe (11) has an inner positioning hole (23) at its rear end, and the outer pipe (12) has two outer positioning holes (23) at its rear end. Positioning elements (24) are provided inside the inner positioning hole (23) and the outer positioning hole (23). When the inner pipe (11) and the outer pipe (12) move to the first slurry outlet position, the inner positioning hole (23) corresponds to the position of one outer positioning hole (23); when the inner pipe (11) and the outer pipe (12) move to the second slurry outlet position, the inner positioning hole (23) corresponds to the position of another outer positioning hole (23). Passing the positioning element (24) through the inner positioning hole (23) and the outer positioning hole (23) can restrict the relative movement between the inner pipe (11) and the outer pipe (12).

5. A progressive segmented grouting conduit according to claim 1, characterized in that: The end of the sealing plug (31) near the outer side of the inner pipe (11) is an arc surface; When the inner pipe (11) and the outer pipe (12) move relative to each other, the arc surface of the sealing plug (31) contacts the inner wall of the outer pipe (12) to reduce the friction between the sealing plug (31) and the outer pipe (12).

6. The progressive segmented grouting conduit according to claim 1, characterized in that: A sealing assembly is provided on the outside of the outer pipe (12). The sealing assembly includes an extension body (32) sleeved on the outer wall of the outer pipe (12) and a ring clamp (33) that fixes the extension body (32) to the outer wall of the outer pipe (12). The extension body (32) is located outside an outgoing grout hole (14). The outgoing grout hole (14) inside the extension body (32) corresponds to the position of the inner grout hole (13). When grout is injected outward, the concrete grout is injected into the extension body (32), causing the extension body (32) to expand. The extension body (32) can contact the inner wall of the crack at its location. The expanded extension body (32) is used to prevent the concrete grout from flowing in the crack channel.

7. A progressive segmented grouting conduit according to claim 6, characterized in that: The grouting conduit includes two sealing components, one of which is located in the middle of the grouting conduit and the other is located at the rear end of the grouting conduit. Grouting is performed when the inner pipe (11) and outer pipe (12) move to the first grout outlet position. The inner grout outlet (13) between the middle sealing component and the front end of the grouting pipe corresponds to the outer grout outlet (14) position and grout is injected outward. The extension body (32) of the middle sealing component expands. When the inner pipe (11) and the outer pipe (12) move to the second grout outlet position, grouting is performed. The inner grout outlet (13) between the middle sealing component and the sealing component at the rear end of the grouting conduit corresponds to the outer grout outlet (14) position and grouting is performed outward. The extension body (32) of the sealing component at the rear end of the conduit expands.

8. A progressive segmented grouting conduit according to claim 6 or 7, characterized in that: The inner pipe (11) has sealing grooves at both ends of the sealing component at the corresponding position. A sealing ring (34) is provided in the sealing groove. The sealing ring (34) seals the gap between the inner pipe (11) and the outer pipe (12) to prevent the concrete slurry inside the extension body (32) from flowing back into the space between the inner pipe (11) and the outer pipe (12) after the extension body (32) expands.

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