Progressive sectional type grouting guide pipe

Abstract

The invention provides a progressive sectional type grouting guide pipe, which belongs to the technical field of tunnel water plugging construction and comprises an inner-layer pipeline (11) and an outer-layer pipeline (12) which are sleeved with each other. The inner-layer pipeline (11) and the outer-layer pipeline (12) can relatively move in the axis direction; the pipe walls of the inner layer pipeline (11) and the outer layer pipeline (12) are respectively provided with an inner slurry outlet hole (13) and an outer slurry outlet hole (14); by means of the gradual sectional type grouting guide pipe, sectional grouting can be conducted in a crack, and sectional grouting is conducted from the small water gushing position to the large water gushing position, from the apron water outlet point to the concentrated water outlet point and from the side wall to the arch part in sequence. Constraint type grouting can be implemented through sectional type grouting, and the purposes of grouting, water plugging and reinforcing are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of tunnel water blocking construction, and more specifically relates to a progressive segmented grouting conduit. Background Art

[0002] Groundwater can have many adverse effects on tunnel construction, mainly on tunnel stability. Groundwater can affect the stability of tunnels. If the groundwater level is too high, the stability of the tunnel may be reduced, and even the collapse of the tunnel may occur. It will also increase the difficulty of construction. Groundwater will increase the difficulty of tunnel construction. During the construction process, drainage needs to be carried out continuously to ensure the normal progress of construction. This will not only increase the cost of construction, but also prolong the construction time. In addition, the presence of groundwater may increase the safety risks of tunnel construction, such as collapse caused by groundwater scouring, leakage of harmful substances in groundwater, etc.

[0003] In the prior art, some tunnel construction uses advanced geological exploration technology to detect geological information ahead of the construction surface. In some cases where groundwater exists, it is usually necessary to treat the groundwater before continuing the tunnel construction. The process of treating groundwater is usually to drill holes to drain the groundwater and then perform grouting to seal the gaps where water seeps.

[0004] In some existing grouting processes, the cracks are sealed by pouring concrete slurry into the cracks. The existing means is to extend a pipe into the cracks, and a plurality of through holes are arranged on the side of the pipe. Grouting is injected into the pipe, and the concrete slurry seeps out from the through holes to finally seal the cracks.

[0005] However, such grouting means has poor water blocking effect and cannot achieve the purpose of reinforcement for some complex cracks, such as those with multiple scattered water outlets and concentrated water outlets, which have the characteristics of many water outlets and large water flow. Summary of the invention

[0006] Based on this, the object of the present invention is to provide a progressive segmented grouting conduit for grouting and water blocking construction of water-rich fissures in tunnels; the grouting conduit comprises an inner layer pipe and an outer layer pipe which are sleeved with each other; the inner layer pipe and the outer layer pipe can move relative to each other along the axis direction; the inner layer pipe and the outer layer pipe are respectively provided with inner slurry outlet holes and outer slurry outlet holes on their walls;

[0007] When the inner layer pipe and the outer layer pipe move relatively to the first slurry outlet position along the axis, a part of the inner slurry outlet holes correspond to the outer slurry outlet holes and are connected to each other; when the inner layer pipe and the outer layer pipe move relatively to the second slurry outlet position along the axis, another part of the inner slurry outlet holes correspond to the outer slurry outlet holes and are connected to each other;

[0008] The front end of the grouting conduit is first extended into the crack, and the rear end of the grouting conduit is used to inject grout into the grouting conduit; by adjusting the relative positions of the inner pipe and the outer pipe, grouting can be injected into one section of the crack, and by adjusting the relative positions of the inner pipe and the outer pipe again, grouting can be injected into another section of the crack.

[0009] Preferably, when the inner layer pipe and the outer layer pipe move relatively to the first slurry outlet position along the axis, the inner slurry outlet hole on the front side of the grouting conduit corresponds to the outer slurry outlet hole and they are interconnected; when the inner layer pipe and the outer layer pipe move relatively to the second slurry outlet position along the axis, the inner slurry outlet hole on the rear side of the grouting conduit corresponds to the outer slurry outlet hole and they are interconnected.

[0010] Preferably, a limiting member is provided at the rear end of the inner layer pipe, and a limiting groove is provided at a corresponding position of the outer layer pipe, and the length direction of the limiting groove is parallel to the axial direction of the grouting conduit;

[0011] When the inner layer pipe and the outer layer pipe move relatively along the axis, the limiting member moves in the limiting groove; when the limiting member moves to one end of the limiting groove, the inner layer pipe and the outer layer pipe move relatively along the axis to the first slurry outlet position; when the limiting member moves to the other end of the limiting groove, the inner layer pipe and the outer layer pipe move relatively along the axis to the second slurry outlet position;

[0012] The limiting member and the limiting groove can also be used to limit the relative movement between the inner layer pipe and the outer layer pipe to only relative movement along the axial direction but not relative rotation.

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

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

[0015] Passing the positioning piece through the inner positioning hole and the outer positioning hole can limit the relative movement between the inner layer pipe and the outer layer pipe.

[0016] Preferably, a sealing plug is provided on the inner slurry outlet hole, and the sealing plug is used to seal the inner slurry outlet hole when the positions of the inner slurry outlet hole and the outer slurry outlet hole do not correspond to each other, so as to prevent concrete slurry from being injected between the inner layer pipe and the outer layer pipe.

[0017] Preferably, the inner slurry outlet hole is a tapered hole; the diameter of the inner slurry outlet hole on the inner side of the inner layer pipe is smaller than the diameter of the outer side of the inner layer pipe; the circumferential surface of the sealing plug is a cone that matches the shape of the inner slurry outlet hole;

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

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

[0020] When the inner layer pipe and the outer layer pipe move relatively, the arc surface of the sealing plug contacts the inner wall of the outer layer pipe, so as to reduce the friction between the sealing plug and the outer layer pipe.

[0021] Preferably, a plugging assembly is provided on the outer side of the outer layer pipe, and the plugging assembly comprises an extension body sleeved on the outer wall of the outer layer pipe and a hoop fixing the extension body on the outer wall of the outer layer pipe;

[0022] The extension body is arranged on the outside of an outgoing slurry hole. The outgoing slurry hole in the extension body corresponds to the position of the inner slurry hole. When grouting outward, concrete slurry is poured into the extension body to expand the extension body. The extension body can contact the inner wall of the crack at the location. The extension body in the expanded state is used to prevent the concrete slurry from flowing in the crack channel.

[0023] Preferably, the grouting conduit comprises two plugging components, one plugging component is arranged at the middle part of the grouting conduit, and the other plugging component is arranged at the rear end of the grouting conduit;

[0024] When the inner layer pipeline and the outer layer pipeline move to the first grouting position, grouting is performed, and the inner grouting hole and the outer grouting hole between the middle plugging component and the front end of the grouting conduit are grouted outwardly corresponding to the positions of the inner grouting hole and the outer grouting hole, and the extension body of the middle plugging component expands;

[0025] When the inner and outer pipes move to the second slurry outlet position, grouting is performed, and the inner slurry outlet hole between the middle plugging component and the plugging component at the rear end of the grouting conduit corresponds to the position of the outer slurry hole and grouting is performed outwardly, and the extension body of the plugging component at the rear end of the conduit expands.

[0026] Preferably, sealing grooves are provided at both ends of corresponding positions of the sealing assembly on the inner pipe, 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 elongation body from flowing back into the space between the inner pipe and the outer pipe after the elongation body expands.

[0027] According to an embodiment of the present invention, a progressive segmented grouting conduit can be used to perform segmented grouting in the cracks, using a sequence of segmented grouting from small water gushing places to large water gushing places, from scattered water outlets to concentrated water outlets, and from side walls to arches. The segmented grouting can implement constrained grouting to achieve the purpose of grouting water blocking and reinforcement. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present disclosure includes drawings, which should be considered to be included in and constitute a part of the specification, and together with the specification, illustrate various exemplary embodiments, features and aspects of the present disclosure, and are used to explain the principles of the present disclosure. The present invention will be more fully understood through the following detailed description in conjunction with the drawings. Among them:

[0029] Figure 1 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 partial enlarged view of the middle A;

[0031] Figure 3 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 partial enlarged view of the middle A;

[0033] Figure 5 yes Figure 3 A partial enlarged view of point B in the middle;

[0034] Among them: inner layer pipeline 11, outer layer pipeline 12, inner slurry outlet hole 13, outer slurry outlet hole 14, tip 15, adjustment ring 16, limiter 21, limiter groove 22, positioning hole 23, positioning member 24, sealing plug 31, extension body 32, hoop 33, sealing ring 34. DETAILED DESCRIPTION

[0035] The technical solution of the present invention is 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, advanced geological exploration technology is used to detect geological information in front of the construction surface. In some cases where groundwater exists, it is usually necessary to treat the groundwater before continuing tunnel construction. The process of treating groundwater is usually to drill holes to drain the groundwater and then inject grouting to seal the gaps that leak water. In some existing grouting processes, these cracks are sealed by pouring concrete slurry into the cracks. The existing means is to extend a pipe into the cracks, and multiple through holes are set on the side of the pipe. Grouting is injected into the pipe, and concrete slurry seeps out from these through holes, and finally the cracks are sealed.

[0037] However, such grouting means has poor water blocking effect and cannot achieve the purpose of reinforcement for some complex cracks, such as those with multiple scattered water outlets and concentrated water outlets, which have the characteristics of many water outlets and large water flow.

[0038] In order to solve the above problems, the object of the present invention is to provide a progressive segmented grouting conduit for grouting and water blocking construction of water-rich fissures in tunnels; the grouting conduit comprises an inner layer pipe 11 and an outer layer pipe 12 which are sleeved with each other; the inner layer pipe 11 and the outer layer pipe 12 can move relative to each other along the axis direction; the inner layer pipe 11 and the outer layer pipe 12 are respectively provided with an inner slurry outlet hole 13 and an outer slurry outlet hole 14 on the pipe wall;

[0039] When the inner layer pipe 11 and the outer layer pipe 12 are relatively moved along the axis to the first pulp outlet position, a part of the inner pulp outlet holes 13 correspond to the outer pulp outlet holes 14 and are connected to each other; when the inner layer pipe 11 and the outer layer pipe 12 are relatively moved along the axis to the second pulp outlet position, another part of the inner pulp outlet holes 13 correspond to the outer pulp outlet holes 14 and are connected to each other;

[0040] The front end of the grouting tube is first extended into the crack, and the rear end of the grouting tube is used to inject grout into the grouting tube; by adjusting the relative positions of the inner pipe 11 and the outer pipe 12, grouting can be injected into one section of the crack, and by adjusting the relative positions of the inner pipe 11 and the outer pipe 12 again, grouting can be injected into another section of the crack.

[0041] The front end of the outer catheter is provided with a tip 15, and the tip 15 can be easily extended into the crack.

[0042] In this embodiment, Figure 1 , Figure 3 As shown, it includes an inner layer pipe 11 and an outer layer pipe 12 which are sleeved with each other, and both the inner layer pipe 11 and the outer layer pipe 12 are hollow cylinders. The grouting conduit includes a front end and a rear end, the front end is the end which first extends into the crack, and the rear end is used for grouting into the cavity of the inner layer pipe 11, and grouting refers to injecting concrete slurry.

[0043] In some embodiments, the grouting catheter is disposable and cannot be reused. The grouting catheter is placed in the crack, and the grouting catheter is not removed after grouting into the crack, and the grouting catheter remains inside the rock wall.

[0044] In some embodiments, the axes of the inner slurry outlet holes 13 and the outer slurry outlet holes 14 on the 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 inner slurry outlet holes 13 and outer slurry outlet holes 14 may be provided on the axial cross-section of the inner layer pipe 11 and the outer layer pipe 12. When the inner slurry outlet holes 13 and the outer slurry outlet holes 14 are staggered, the concrete slurry inside the inner layer pipe 11 cannot be output to the outside of the grouting conduit. When the grouting conduit is inserted into the crack, the inner slurry outlet holes 13 and the outer slurry outlet holes 14 may be staggered. After the grouting conduit is inserted in place, it is adjusted to the first slurry outlet position, and then grouting is performed.

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

[0047] In the specific implementation process, a hydraulically driven tool can be installed between the adjustment ring 16 and the end of the outer layer pipe 12 to adjust the relative position of the inner layer pipe 11 and the outer layer pipe 12. If the crack size is large, the grouting conduit can be directly inserted into the crack. If the crack size is small, the hole can be drilled and expanded before the grouting conduit is inserted into the hole.

[0048] Furthermore, when the inner layer pipe 11 and the outer layer pipe 12 move relatively to the first slurry outlet position along the axis, the inner slurry outlet hole 13 and the outer slurry outlet hole 14 on the front side of the grouting pipe correspond to each other and are interconnected; when the inner layer pipe 11 and the outer layer pipe 12 move relatively to the second slurry outlet position along the axis, the inner slurry outlet hole 13 and the outer slurry outlet hole 14 on the rear side of the grouting pipe correspond to each other and are interconnected.

[0049] This embodiment proposes a method for arranging the inner grouting holes 13 and the outer grouting holes 14 for segmented grouting through a grouting conduit, such as Figure 3 As shown, Figure 3 The grouting conduit in is in the initial state. In the initial state, the inner slurry outlet hole 13 and the outer slurry outlet hole 14 are staggered. The outer slurry outlet hole 14 on the front side of the grouting conduit is arranged on the front side of the inner slurry outlet hole 13; the outer slurry outlet hole 14 on the rear side of the grouting conduit is arranged on the rear side of the inner slurry outlet hole 13. The inner layer pipe 11 is pushed forward to the first slurry outlet position. At this time, the inner slurry outlet hole 13 and the outer slurry outlet hole 14 on the front side of the grouting conduit correspond to each other and are interconnected, and the concrete slurry of the inner layer pipe 11 can be output from the front side of the grouting conduit. The inner layer pipe 11 is pushed backward to the second slurry outlet position. At this time, the inner slurry outlet hole 13 and the outer slurry outlet hole 14 on the rear side of the grouting conduit correspond to each other and are interconnected, and the concrete slurry of the inner layer pipe 11 can be output from the rear side of the grouting conduit.

[0050] In the specific implementation process, the order of grouting is determined according to the actual situation. Grouting can be performed from the back side of the grouting conduit first, or from the front side of the grouting conduit first.

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

[0052] When the inner layer pipe 11 and the outer layer pipe 12 move relatively along the axis, the limiting member 21 moves in the limiting groove 22; when the limiting member 21 moves to one end of the limiting groove 22, the inner layer pipe 11 and the outer layer pipe 12 move relatively 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 layer pipe 11 and the outer layer pipe 12 move relatively 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 layer pipe 11 and the outer layer pipe 12 to only relative movement along the axial direction and not relative rotation.

[0054] In this embodiment, Figure 2 As shown, the limiting member 21 can be a positioning pin. The limiting member 21 of this embodiment is a bolt. A matching threaded hole is provided on the inner layer pipe 11. The bolt is screwed into the threaded hole and passes through the limiting groove 22 on the outer layer pipe 12. The limiting groove 22 of this embodiment is a waist-shaped hole. The limiting member 21 can be moved in the limiting groove 22 by moving the inner layer pipe 11 and the outer layer pipe 12. The limiting member 21 moves to the two ends of the limiting groove 22 corresponding to the first slurry outlet position and the second slurry outlet position respectively.

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

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

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

[0058] In this embodiment, the inner positioning hole 23 and the outer positioning hole 23 are used to fix the relative position 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 member 24 in this embodiment is a bolt, the inner positioning hole 23 is a threaded hole matching the bolt, and the outer positioning hole 23 is a through hole matching 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 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 outer positioning hole 23 on the rear side.

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

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

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

[0063] Further, the inner slurry outlet hole 13 is a tapered hole; the diameter of the inner slurry outlet hole 13 on the inner side of the inner layer pipe 11 is smaller than the diameter of the outer side of the inner layer pipe 11; the circumferential surface of the sealing plug 31 is a cone that matches the shape of the inner slurry outlet hole 13;

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

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

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

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

[0068] In some embodiments, Figure 4 , Figure 5 As shown, the end of the sealing plug 31 close to the outer side of the inner layer pipe 11 is an arc surface, and the arc surface of the sealing plug 31 is in point contact with the inner wall of the outer layer pipe 12, so the arc surface of the sealing plug 31 can reduce the friction between the sealing plug 31 and the outer layer pipe 12

[0069] Furthermore, a plugging assembly is provided on the outer side of the outer layer pipe 12, and the plugging assembly includes an extension body 32 sleeved on the outer wall of the outer layer pipe 12 and a hoop 33 fixing the extension body 32 on the outer wall of the outer layer pipe 12;

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

[0071] In this embodiment, Figure 5 As shown, the extension body 32 can be a flexible film, and the concrete slurry is injected into the extension body 32 through the inner slurry outlet hole 13 and the outer slurry outlet hole 14. The extension body 32 expands and contacts the rock wall of the fissure or the inner wall of the manually drilled drainage hole. The pressure of grouting can keep the extension body 32 in an expanded state. The expansion state of the extension body 32 is used to prevent the concrete slurry from flowing in the fissure channel. The flow of the concrete slurry output by the grouting conduit in the fissure can be blocked by the expansion state of the extension body 32, so that the grouting can only be carried out within a range, realizing segmented grouting.

[0072] The hoop 33 of this embodiment can be a metal wire wound around the two ends of the extension body 32 , or can be an elastic rope that ties the extension body 32 to the outer pipe 12 .

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

[0074] Furthermore, the grouting conduit comprises two plugging components, one plugging component is arranged at the middle part of the grouting conduit, and the other plugging component is arranged at the rear end of the grouting conduit;

[0075] When the inner layer pipe 11 and the outer layer pipe 12 move to the first grouting position, grouting is performed, and the inner grouting hole 13 and the outer grouting hole 14 between the middle plugging component and the front end of the grouting conduit are grouted outwardly corresponding to the positions, and the extension body 32 of the middle plugging component expands;

[0076] When the inner pipe 11 and the outer pipe 12 move to the second slurry outlet position, grouting is performed, and the inner slurry outlet hole 13 and the outer slurry hole 14 between the middle plugging component and the plugging component at the rear end of the grouting conduit are grouted outwardly correspondingly, and the extension body 32 of the plugging component at the rear end of the conduit expands.

[0077] The grouting conduit of this embodiment is provided with two grouting sections, one of which is the front side grouting section corresponding to the first grouting position. The other grouting section is the rear side grouting section corresponding to the second grouting position. The grouting conduit with two grouting sections is provided with two plugging assemblies, one plugging assembly is arranged at the middle position of the two grouting sections, and the other plugging assembly is arranged at the rear end of the rear side grouting section.

[0078] The first plugging component is used to allow the concrete slurry to flow to the rear slurry outlet segment when the front slurry outlet segment is grouting. The second plugging component is used to allow the concrete slurry to flow to the outside of the crack when the rear slurry outlet segment is grouting.

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

[0080] In this embodiment, Figure 5 As shown, the sealing ring 34 can be a rubber ring. The grouting pressure of the inner slurry outlet hole 13 and the outer slurry outlet hole 14 to which the expanded extension body 32 belongs is very large, and the concrete slurry may flow between the inner layer pipe 11 and the outer layer pipe 12. The sealing ring 34 is used to seal the gap between the inner layer pipe 11 and the outer layer pipe 12.

[0081] The various embodiments disclosed in the present invention have been described above. The above description is exemplary and not exhaustive, and the scope of the present invention is not limited to the above embodiments. Many modifications and changes are obvious to those of ordinary skill in the art without departing from the spirit and scope of the present invention. In other words, those of ordinary skill in the art can make various changes and improvements to the present invention in form and detail, and these are considered to fall within the scope of protection of the present invention. The choice of terms used herein is intended to best explain the principles of the various embodiments, practical applications, or improvements to the technology in the market, or to enable those of ordinary skill in the art to understand the various embodiments disclosed herein.

Claims

1. A progressive segmented grouting conduit, used for grouting and water blocking construction of water-rich fissures in tunnels; characterized by: The grouting conduit comprises an inner layer pipe (11) and an outer layer pipe (12) which are sleeved with each other; the inner layer pipe (11) and the outer layer pipe (12) can move relative to each other along the axis direction; inner slurry outlet holes (13) and outer slurry outlet holes (14) are respectively arranged on the pipe walls of the inner layer pipe (11) and the outer layer pipe (12); When the inner layer pipe (11) and the outer layer pipe (12) are relatively moved along the axis to a first pulp outlet position, a portion of the inner pulp outlet holes (13) correspond to the outer pulp outlet holes (14) and are interconnected; when the inner layer pipe (11) and the outer layer pipe (12) are relatively moved along the axis to a second pulp outlet position, another portion of the inner pulp outlet holes (13) correspond to the outer pulp outlet holes (14) and are interconnected; The front end of the grouting conduit is first extended into the fissure, and the rear end of the grouting conduit is used to inject grout into the grouting conduit; by adjusting the relative positions of the inner layer conduit (11) and the outer layer conduit (12), grouting can be injected into one segment in the fissure, and by adjusting the relative positions of the inner layer conduit (11) and the outer layer conduit (12) again, grouting can be injected into another segment in the fissure.

2. A progressive segmented grouting conduit according to claim 1, characterized in that: When the inner layer pipe (11) and the outer layer pipe (12) are relatively moved along the axis to the first slurry outlet position, the inner slurry outlet hole (13) and the outer slurry outlet hole (14) on the front side of the grouting pipe correspond to each other and are interconnected; when the inner layer pipe (11) and the outer layer pipe (12) are relatively moved along the axis to the second slurry outlet position, the inner slurry outlet hole (13) and the outer slurry outlet hole (14) on the rear side of the grouting pipe correspond to each other and are interconnected.

3. A progressive segmented grouting conduit according to claim 1 or 2, characterized in that: A limiting member (21) is provided at the rear end of the inner layer pipe (11), and a limiting groove (22) is provided at a corresponding position of the outer layer pipe (12), wherein the length direction of the limiting groove (22) is parallel to the axial direction of the grouting conduit; When the inner layer pipe (11) and the outer layer pipe (12) move relatively along the axis, the limiting member (21) moves in the limiting groove (22); when the limiting member (21) moves to one end of the limiting groove (22), the inner layer pipe (11) and the outer layer pipe (12) move relatively along the axis to a first slurry outlet position; when the limiting member (21) moves to the other end of the limiting groove (22), the inner layer pipe (11) and the outer layer pipe (12) move relatively along the axis to a second slurry outlet position; The limiting member (21) and the limiting groove (22) can also be used to limit the relative movement between the inner layer pipe (11) and the outer layer pipe (12) to only 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 rear end of the inner layer pipe (11) is provided with an inner positioning hole (23), the rear end of the outer layer pipe (12) is provided with two outer positioning holes (23), and positioning pieces (24) are provided inside the inner positioning hole (23) and the outer positioning holes (23); When the inner layer pipe (11) and the outer layer pipe (12) move to a first slurry discharge position, the inner positioning hole (23) corresponds to the position of an outer positioning hole (23); when the inner layer pipe (11) and the outer layer pipe (12) move to a second slurry discharge position, the inner positioning hole (23) corresponds to the position of another outer positioning hole (23); Passing the positioning member (24) through the inner positioning hole (23) and the outer positioning hole (23) can limit the relative movement between the inner layer pipe (11) and the outer layer pipe (12).

5. The progressive segmented grouting conduit according to claim 1, characterized in that: The inner slurry outlet hole (13) is provided with a sealing plug (31), and the sealing plug (31) is used to seal the inner slurry outlet hole (13) when the positions of the inner slurry outlet hole (13) and the outer slurry outlet hole (14) do not correspond to each other, so as to prevent concrete slurry from being injected between the inner layer pipe (11) and the outer layer pipe (12).

6. The progressive segmented grouting conduit according to claim 5, characterized in that: The inner slurry outlet hole (13) is a tapered hole; the diameter of the inner slurry outlet hole (13) on the inner side of the inner layer pipe (11) is smaller than the diameter of the outer side of the inner layer pipe (11); the circumferential surface of the sealing plug (31) is a tapered shape matching the shape of the inner slurry outlet hole (13); The conical sealing plug (31) and the inner slurry outlet hole (13) are used to prevent the sealing plug (31) from falling into the inner layer pipe (11). When the inner slurry outlet hole (13) corresponds to the outer slurry outlet hole (14), grouting into the grouting conduit can push the sealing plug (31) out of the inner slurry outlet hole (13) and through the outer slurry outlet hole (14), and finally to the outside of the grouting conduit along with the concrete slurry.

7. A progressive segmented grouting conduit according to claim 5 or 6, characterized in that: One end of the sealing plug (31) close to the outer side of the inner layer pipe (11) is an arc surface; When the inner layer pipe (11) and the outer layer pipe (12) move relative to each other, the arc surface of the sealing plug (31) contacts the inner wall of the outer layer pipe (12), so as to reduce the friction between the sealing plug (31) and the outer layer pipe (12).

8. The progressive segmented grouting conduit according to claim 1, characterized in that: A plugging assembly is arranged on the outer side of the outer layer pipe (12), and the plugging assembly comprises an extension body (32) sleeved on the outer wall of the outer layer pipe (12) and a hoop (33) fixing the extension body (32) on the outer wall of the outer layer pipe (12); The extension body (32) is arranged outside an outgoing grout hole (14); the outgoing grout hole (14) in the extension body (32) corresponds to the position of the inner grout hole (13); when grouting is injected outward, concrete grout is poured into the extension body (32) to expand the extension body (32); the extension body (32) can contact the inner wall of the crack at the location; the extension body (32) in the expanded state is used to prevent the concrete grout from flowing in the crack channel.

9. The progressive segmented grouting conduit according to claim 8, characterized in that: The grouting conduit comprises two plugging components, one plugging component is arranged at the middle part of the grouting conduit, and the other plugging component is arranged at the rear end of the grouting conduit; Grouting is performed when the inner layer pipe (11) and the outer layer pipe (12) move to the first grouting position, and the inner grouting hole (13) and the outer grouting hole (14) between the middle plugging component and the front end of the grouting conduit are grouting-performed outwardly at positions corresponding to those of the inner grouting hole (13) and the outer grouting hole (14), and the extension body (32) of the middle plugging component expands; When the inner layer pipe (11) and the outer layer pipe (12) move to the second grouting position, grouting is performed, and the inner grouting hole (13) and the outer grouting hole (14) between the middle plugging component and the plugging component at the rear end of the grouting conduit are grouted outwardly corresponding to the positions, and the extension body (32) of the plugging component at the rear end of the conduit expands.

10. A progressive segmented grouting conduit according to claim 8 or 9, characterized in that: Sealing grooves are arranged at both ends of the corresponding positions of the sealing assembly on the inner layer pipe (11), and sealing rings (34) are arranged in the sealing grooves. The sealing rings (34) seal the gap between the inner layer pipe (11) and the outer layer pipe (12), thereby preventing the concrete slurry inside the extension body (32) from flowing back into the space between the inner layer pipe (11) and the outer layer pipe (12) after the extension body (32) expands.

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