Plugging device for backfill grouting of tunnel supporting structure and using method of plugging device

Abstract

The invention relates to the technical field of tunnel construction equipment, in particular to a plugging device for backfill grouting of a tunnel supporting structure and a using method of the plugging device, and the plugging device structurally comprises a guide groove, a plugging block arranged on the guide groove in a sliding mode and a folding sliding block. The guide groove is fixedly formed in the end face of the corrugated steel supporting structure, and a locking structure used for locking the plugging block is further arranged on the guide groove. The plugging block can slide in the radial direction of the corrugated steel supporting structure relative to the guide groove so that the outward end of the plugging block can be embedded into the surrounding rock, and a gap between the corrugated steel supporting structure and the surrounding rock can be plugged. The folding sliding blocks are arranged on one sides of the plugging blocks, can slide out of the side edges of the plugging blocks and are used for plugging gaps between the adjacent plugging blocks. By means of the post-grouting plugging structure, the technical problems that an existing post-grouting plugging structure for the corrugated steel wall is not compact in grouting, tedious in operation and not reusable can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel construction equipment, and particularly to a plugging device for post-grouting behind the support structure of a tunnel and a using method thereof. Background Art

[0002] With the continuous development of assembled support structures, the application fields of assembled support structures are becoming wider and wider. Corrugated steel structures begin to be applied in tunnel engineering due to their advantages such as convenient installation, high strength, economy and environmental protection.

[0003] In the traditional arch support method, after the corrugated steel support structure is assembled, there are certain gaps between the support structure and the surrounding rock. Due to the different gaps at each position, it is a difficult problem to solve the plugging before grouting. The existing plugging methods are realized by arranging cloth bag beams, shotcrete, etc. behind the wall. These methods will cause changes in the assembly attitude of the support structure, and at the same time, there will also be problems such as non-dense grouting, low construction efficiency and non-reusability. Summary of the Invention

[0004] The purpose of the present invention is to provide a plugging device for post-grouting behind the support structure of a tunnel and a using method thereof. By setting a modular plugging structure matching the corrugated steel, the density and construction efficiency of post-grouting behind the wall are improved, the comprehensive application cost of the corrugated steel support structure is reduced, and the technical problems of non-dense grouting, cumbersome operation and non-reusability of the existing corrugated steel post-grouting plugging structure can be solved.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions.

[0006] A plugging device for post-grouting behind the support structure of a tunnel includes a guiding groove, a plugging block slidably arranged on the guiding groove, and a folding slider.

[0007] The guiding groove is fixedly arranged on the end face of the corrugated steel support structure, and a locking structure for locking the plugging block is also arranged on the guiding groove.

[0008] The plugging block can slide relative to the guiding groove along the radial direction of the corrugated steel support structure, so that the outer end of the plugging block is embedded into the surrounding rock to plug the gap between the corrugated steel support structure and the surrounding rock.

[0009] The folding slider is arranged on one side of the plugging block, and the folding slider can slide out from the side of the plugging block to plug the gap between adjacent plugging blocks.

[0010] Further, the guiding groove is fixedly connected to the end face of the corrugated steel support structure through a guiding groove screw, and a plugging block limiting groove is arranged on the guiding groove. The plugging block is slidably arranged in the plugging block limiting groove and can slide along the guiding direction of the plugging block limiting groove.

[0011] Further, grooves and protrusions are respectively provided at both ends of the guiding groove in the width direction. The guiding grooves in adjacent plugging devices can be connected through the cooperation of the grooves and protrusions, further increasing the stability of the plugging device.

[0012] Further, the locking structure includes locking bolt holes provided on the guiding groove and locking bolts provided in the locking bolt holes.

[0013] Further, one end of the plugging block in the sliding direction is provided with a wedge-shaped end for increasing the reliability of the plugging block embedded in the surrounding rock, and the other end is provided with a baffle for preventing the plugging block from disengaging from the guiding groove.

[0014] Further, a folding slider installation groove along the length direction is provided on one side of the plugging block. The folding slider is arranged in the folding slider installation groove and can slide out from the side of the plugging block.

[0015] Further, the folding slider includes slider Ⅰ and slider Ⅱ. A folding slider limiting block is provided on slider Ⅰ. A transverse folding slider ejection guiding groove is provided in the folding slider installation groove. The folding slider limiting block cooperates with the folding slider ejection guiding groove to limit the position of slider Ⅰ in the folding slider installation groove along the length direction of the plugging block.

[0016] Slider Ⅱ is slidably connected to slider Ⅰ for adjusting the length of the folding slider. A folding slider adjustment viewing window for adjusting the length of the folding slider is also provided on the plugging block at the position where the folding slider installation groove is provided.

[0017] Further, a spring for ejecting the folding slider from one side of the plugging block is provided at the bottom of the folding slider installation groove.

[0018] Further, the plugging device further includes a connecting rod. The connecting rod includes a rod base, rod body Ⅰ and rod body Ⅱ. The rod base is provided with a rotating shaft hole. The rod base is rotationally connected to the connecting rod rotating shaft provided on the plugging block through the rotating shaft hole and is arranged on the plugging block. One ends of rod body Ⅰ and rod body Ⅱ are both connected to the rod base through ball joints. The free end of rod body Ⅰ is provided with internal threads, and the free end of rod body Ⅱ is provided with external threads for connecting to the rod body in an adjacent plugging device.

[0019] A method for using a plugging device for post-grouting behind the wall of a tunnel support structure includes the following steps.

[0020] Step 1, after the tunnel corrugated steel support structure is assembled, the guiding groove is fixedly installed on the end face of the corrugated steel support structure through the guiding groove screw rod and the bolt hole on the end face of the corrugated steel support structure. Multiple guiding grooves are arranged in sequence and densely distributed along the end face of the corrugated steel support structure.

[0021] Step 2: Install the plugging block into the plugging block limiting groove of the guiding groove, and push the plugging block to slide radially outward along the corrugated steel support structure, so that the wedge-shaped end of the plugging block is embedded into the surrounding rock, and lock the plugging block and the guiding groove with the locking bolts.

[0022] Step 3: Connect the rod I and rod II on the plugging blocks in adjacent plugging devices in sequence through the internal thread at the free end of rod I and the external thread at the free end of rod II to reinforce the plugging surface formed by the plugging blocks.

[0023] Step 4: Adjust the length of the folding slider through the folding slider adjusting window so that it can completely cover the gap between the corrugated steel support structure and the surrounding rock. The folding slider is pushed out from the side of the plugging block under the action of the spring, and the outer end of the folding slider abuts against the side of the adjacent plugging block without the folding slider installation groove under the elastic force of the spring to block the gap between adjacent plugging blocks.

[0024] Step 5: After the front-end plugging of the post-grouting behind the corrugated steel support structure is completed, grout behind the wall through the grouting hole. After the grouting is completed, remove the plugging device and reinstall it during the next post-grouting behind the wall.

[0025] After adopting the above technical solutions, the present invention has the following beneficial effects: 1. The present invention can realize the front-end plugging of the corrugated steel support structure, improve the density of the post-grouting behind the wall, increase the bonding strength between the structure and the surrounding rock, and solve the problem of partial void between the surrounding rock and the structure existing in the plugging method of the cloth bag beam; 2. The present invention is a modular plugging structure, which can improve the plugging construction efficiency and plugging effect, and can be removed after grouting for multiple uses, reducing the comprehensive construction cost; 3. The present invention realizes the reinforcement of the plugging section and the filling of the gap between adjacent plugging blocks by setting the connecting rod and the folding slider, improving the post-grouting effect behind the wall. Description of the Drawings

[0026] Figure 1 is the overall structure schematic diagram of the present invention.

[0027] Figure 2 is Figure 1 the explosion structure schematic diagram of

[0028] Figure 3 is the overall structure schematic diagram (one ring) of the corrugated steel support structure.

[0029] Figure 4 is the overall structure schematic diagram of the guiding groove in the present invention.

[0030] Figure 5 is the overall structure schematic diagram of the plugging block in the present invention.

[0031] Figure 6 This is a schematic diagram of the overall structure of the folding slider in the present invention.

[0032] Figure 7 This is a schematic sectional view of the plugging block in the present invention.

[0033] Figure 8 This is a schematic diagram of the overall structure of the connecting rod in the present invention.

[0034] Description of the drawings: 1. Guide groove, 11. Guide groove screw, 12. Plugging block limit groove, 13. Groove, 14. Protrusion, 15. Locking bolt hole, 2. Plugging block, 21. Wedge-shaped end, 22. Baffle, 23. Folding slider installation groove, 231. Folding slider ejection guide groove, 232. Folding slider adjustment window, 233. Spring, 24. Connecting rod rotation shaft, 25. Connecting rod hidden groove, 3. Folding slider, 31. Slider Ⅰ, 311. Folding slider limit block, 32. Slider Ⅱ, 4. Connecting rod, 41. Rod base, 42. Rod body Ⅰ, 43. Rod body Ⅱ, 44. Ball hinge, 5. Corrugated steel support structure, 51. Bolt hole. Detailed implementation manners

[0035] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the features and performances of a plugging device for post-grouting behind the wall of a tunnel support structure and its usage method in the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0036] Embodiment 1 As Figure 1 As originally intended to be shown, a plugging device for post-grouting behind the wall of a tunnel support structure includes a guide groove 1, a plugging block 2 slidably arranged on the guide groove 1, and a folding slider 3.

[0037] The guide groove 1 is fixedly arranged on the end face of the corrugated steel support structure 5, and a locking structure for locking the plugging block 2 is further arranged on the guide groove 1.

[0038] The plugging block 2 can slide radially with respect to the guide groove 1 along the corrugated steel support structure 5, and is used to embed the outer end of the plugging block 2 into the surrounding rock to plug the gap between the corrugated steel support structure 5 and the surrounding rock.

[0039] The folding slider 3 is arranged on one side of the plugging block 2, and the folding slider 3 can slide out from the side of the plugging block 2 to plug the gap between adjacent plugging blocks 2.

[0040] Further, the guide groove 1 is fixedly connected to the end face of the corrugated steel support structure 5 through a guide groove screw 11, and a plugging block limit groove 12 is arranged on the guide groove 1. The plugging block 2 is slidably arranged in the plugging block limit groove 12 and can slide along the guiding direction of the plugging block limit groove 12.

[0041] Further, grooves 13 and protrusions 14 are respectively provided at both ends of the guiding groove 1 in the width direction. The guiding grooves 1 in adjacent plugging devices can be connected through the cooperation of the grooves 13 and protrusions 14, further increasing the stability of the plugging device.

[0042] Further, the locking structure includes a locking bolt hole 15 provided on the guiding groove 1 and a locking bolt provided in the locking bolt hole 15.

[0043] Further, a wedge-shaped end 21 is provided at one end of the plugging block 2 in the sliding direction for increasing the reliability of the plugging block 2 embedded in the surrounding rock, and a baffle 22 for preventing the plugging block 2 from disengaging from the guiding groove 1 is provided at the other end.

[0044] Further, a folding slider installation groove 23 along the length direction is provided on one side of the plugging block 2. The folding slider 3 is arranged in the folding slider installation groove 23 and can slide out from the side of the plugging block 2.

[0045] Further, the folding slider 3 includes a slider I 31 and a slider II 32. A folding slider limiting block 311 is provided on the slider I 31. A transverse folding slider ejection guiding groove 231 is provided in the folding slider installation groove 23. The folding slider limiting block 311 cooperates with the folding slider ejection guiding groove 231 to limit the position of the slider I 31 in the folding slider installation groove 23 along the length direction of the plugging block 2.

[0046] The slider II 32 is slidably connected to the slider I 31 for adjusting the length of the folding slider 3. A folding slider adjustment viewing window 232 for adjusting the length of the folding slider 3 is further provided on the plugging block 2 at the position where the folding slider installation groove 23 is provided.

[0047] Further, a spring 233 for ejecting the folding slider 3 from one side of the plugging block 2 is provided at the bottom of the folding slider installation groove 23.

[0048] Further, the plugging device further includes a connecting rod 4. The connecting rod 4 includes a rod base 41, a rod body I 42, and a rod body II 43. The rod base 41 is provided with a rotating shaft hole 411. The rod base 41 is rotatably connected to a connecting rod rotating shaft 24 provided on the plugging block 2 through the rotating shaft hole 411. One ends of the rod body I 42 and the rod body II 43 are both connected to the rod base 41 through a ball joint 44. The free end of the rod body I 42 is provided with an internal thread, and the free end of the rod body II 43 is provided with an external thread for connecting to the rod body in an adjacent plugging device.

[0049] In specific implementation, a plugging device for post-grouting behind the lining of a tunnel support structure includes a guiding groove 1, a plugging block 2, a folding slider 3, and a connecting rod 4. The plugging device adopts a modular device to solve the problem of plugging at the front end of a corrugated steel support structure 5.

[0050] The plugging device includes a guiding groove 1, a plugging block 2, a folding slider 3 and a connecting rod 4. The guiding groove 1 is installed on the front end face of the corrugated steel support structure 5. The plugging block 2 can slide along the guiding groove 1 so that part of it is embedded in the surrounding rock. The void is plugged and the plugging surface is reinforced through the folding slider 3 and the connecting rod 4, providing conditions for grouting behind the wall.

[0051] The guiding groove 1 includes a guiding groove screw 11, a plugging block limiting groove 12, a groove 13, a convex groove 14 and a locking bolt hole 15. The guiding groove screw 11 is matched with a preset bolt hole 51 of the corrugated steel support structure 5 to fix the guiding groove 1 on the front end face of the corrugated steel support structure 5. The groove 13 and the convex groove 14 are matching structures to ensure the connection effect of adjacent guiding grooves 1. The plugging block limiting groove 12 defines the sliding direction of the plugging block 2, and the function of the locking bolt hole 15 is to lock the plugging block 2 on the guiding groove 1 with a locking bolt.

[0052] The plugging block 2 includes a wedge-shaped end 21, a baffle 2, a folding slider installation groove 23, a folding slider ejection guiding groove 231, a folding slider adjustment window 232, a spring 233, a connecting rod rotating shaft 24, and a connecting rod hidden groove 25. After the wedge-shaped end 21 is embedded in the surrounding rock, the plugging block 2 is locked with a bolt through the locking bolt hole 15. The connecting rod 4 is taken out from the connecting rod hidden groove 25, and the connecting rods 4 between adjacent plugging blocks 2 are connected end to end. The length of the folding slider 3 is adjusted through the folding slider adjustment window 232, and then the folding slider 3 is ejected along the folding slider ejection guiding groove 231 by the spring 233 to plug the void between adjacent plugging blocks 2.

[0053] The connecting rod 4 includes a rod base 41, a rod body I 42, a rod body II 43 and a ball joint 44. The rod base 41 is matched with the connecting rod rotating shaft 24 through a rotating shaft hole 411. After the plugging blocks 2 are locked, the rod body I 42 and the rod body II 43 on adjacent plugging blocks 2 are sequentially connected through internal and external thread fittings on the rod to reinforce the plugging surface formed by the locked plugging blocks 2.

[0054] The folding slider 3 includes a slider I 31 and a slider II 32. The slider I 31 and the slider II 32 are slidably connected to adjust the length of the folding slider 3. The folding slider 3 pops out from the side of the plugging block 2 to plug the void between adjacent plugging blocks 2.

[0055] Embodiment 2 A method for using a plugging device for grouting behind the wall of a tunnel support structure includes the following steps.

[0056] Step 1, after the tunnel corrugated steel support structure 5 is assembled, the guiding groove 1 is fixedly installed on the end face of the corrugated steel support structure 5 through the guiding groove screw 11 and the bolt hole on the end face of the corrugated steel support structure 5. Multiple guiding grooves 1 are arranged in sequence and cover the end face of the corrugated steel support structure 5.

[0057] Step 2: Install the plugging block 2 into the plugging block limiting groove 12 of the guiding groove 1, and push the plugging block 2 to slide radially outward along the corrugated steel support structure 5, so that the wedge-shaped end 21 of the plugging block 2 is embedded into the surrounding rock, and lock the plugging block 2 and the guiding groove 1 with locking bolts.

[0058] Step 3: Connect the rod body I 42 and the rod body II 43 on the plugging block 2 in adjacent plugging devices in sequence through the internal thread at the free end of the rod body I 42 and the external thread at the free end of the rod body II 43 to reinforce the plugging surface formed by the plugging block 2.

[0059] Step 4: Adjust the length of the folding slider 3 through the folding slider adjustment window 232 so that it can completely cover the gap between the corrugated steel support structure 5 and the surrounding rock. The folding slider 3 is pushed out from the side of the plugging block 2 under the action of the spring 233, and the outer end of the folding slider 3 facing outward abuts against the side of the adjacent plugging block 2 without the folding slider installation groove 23 under the elastic force of the spring 233 to plug the gap between the adjacent plugging blocks 2.

[0060] Step 5: After the front-end plugging of the post-grouting behind the corrugated steel support structure 5 is completed, grout the area behind the wall through the grouting hole. After the grouting is completed, remove the plugging device and reinstall it during the next post-grouting behind the wall.

[0061] Specifically in implementation, a method for using a plugging device for post-grouting behind the tunnel support structure includes the following steps.

[0062] After the tunnel corrugated steel support structure 5 is assembled, first install the guiding groove 1. The guiding groove 1 is provided with a guiding groove screw rod 11 that matches the preset bolt hole 51 of the corrugated steel support structure 5, and can be connected to the front end face of the corrugated steel support structure 5.

[0063] Then install the plugging block 2 along the guiding groove 1. After the wedge-shaped end 21 is embedded into the surrounding rock, lock the plugging block 2 through the locking bolt hole 15 with bolts.

[0064] After the plugging block 2 is locked, connect the rod body I 42 and the rod body II 43 on the adjacent plugging blocks 2 in sequence through the internal and external threads on the rod members to reinforce the plugging surface formed by the locked plugging blocks 2.

[0065] Adjust the length of the folding slider 3 through the folding slider adjustment window 232, and then the spring 233 pops the folding slider 3 out of the folding slider pop-up guiding groove 231 to plug the gap between the adjacent plugging blocks 2.

[0066] After the front-end plugging before the post-grouting behind the corrugated steel support structure 5 is achieved, grout the area behind the wall through the grouting hole. After the grouting is completed, remove the plugging device and reinstall it during the next post-grouting behind the wall.

[0067] It should be noted that the parts not described in detail in this solution are all prior arts. The above embodiments are only used to illustrate the present invention, but the present invention is not limited to the above embodiments. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention all fall within the protection scope of the present invention.

Claims

1. A plugging device for back grouting of a tunnel support structure wall, characterized in that: It comprises a guide groove (1), a blocking block (2) slidably arranged on the guide groove (1), and a folding slide block (3). The guide groove (1) is fixedly arranged on the end surface of the corrugated steel support structure (5), and a locking structure for locking the blocking block (2) is also arranged on the guide groove (1). The blocking block (2) can slide relative to the guide groove (1) along the radial direction of the corrugated steel support structure (5), so as to embed the outward end of the blocking block (2) into the surrounding rock, thereby blocking the gap between the corrugated steel support structure (5) and the surrounding rock. The folding slider (3) is arranged on one side of the blocking block (2), and the folding slider (3) can slide out from the side of the blocking block (2) to block the gap between adjacent blocking blocks (2).

2. A plugging device for post-grouting of a tunnel support structure wall according to claim 1, characterized in that: The guide groove (1) is fixedly connected to the end surface of the corrugated steel support structure (5) via a guide groove screw (11); a blocking block limiting groove (12) is provided on the guide groove (1); and the blocking block (2) is slidably arranged in the blocking block limiting groove (12) and can slide along the guide direction of the blocking block limiting groove (12).

3. A plugging device for post-grouting of a tunnel support structure wall according to claim 2, characterized in that: A groove (13) and a convex groove (14) are respectively provided at both ends of the guide groove (1) in the width direction; the guide grooves (1) in adjacent blocking devices can be connected through the cooperation of the groove (13) and the convex groove (14), thereby further increasing the stability of the blocking device.

4. A plugging device for post-grouting of a tunnel support structure wall according to claim 3, characterized in that: The locking structure comprises a locking bolt hole (15) provided on the guide groove (1) and a locking bolt provided in the locking bolt hole (15).

5. A plugging device for post-grouting of a tunnel support structure wall according to claim 4, characterized in that: The blocking block (2) is provided with a wedge-shaped end (21) at one end in the sliding direction, which is used to increase the reliability of the blocking block (2) being embedded in the surrounding rock, and a baffle (22) is provided at the other end to prevent the blocking block (2) from falling out of the guide groove (1).

6. A plugging device for post-grouting of a tunnel support structure wall according to claim 5, characterized in that: A folding slider installation groove (23) is provided on one side of the blocking block (2) along the length direction, and the folding slider (3) is arranged in the folding slider installation groove (23) and can slide out from the side of the blocking block (2).

7. A plugging device for post-grouting of a tunnel support structure wall according to claim 6, characterized in that: The folding slider (3) comprises a slider I (31) and a slider II (32). The slider I (31) is provided with a folding slider limiting block (311). The folding slider installation groove (23) is provided with a transverse folding slider pop-up guide groove (231). The folding slider limiting block (311) cooperates with the folding slider pop-up guide groove (231) to limit the position of the slider I (31) in the folding slider installation groove (23) along the length direction of the blocking block (2). The slider II (32) is slidably connected to the slider I (31) and is used to adjust the length of the folding slider (3). The blocking block (2) is also provided with a folding slider adjustment window (232) for adjusting the length of the folding slider (3) at a location where the folding slider installation groove (23) is provided.

8. A plugging device for post-grouting of a tunnel support structure wall according to claim 7, characterized in that: A spring (233) for ejecting the folding slider (3) from one side of the blocking block (2) is provided at the bottom of the folding slider installation groove (23).

9. A plugging device for post-grouting of a tunnel support structure wall according to claim 8, characterized in that: The blocking device further comprises a connecting rod (4), the connecting rod (4) comprising a rod base (41), a rod body I (42) and a rod body II (43), the rod base (41) being provided with a rotation axis hole (411), the rod base (41) being rotatably connected to a connecting rod rotation axis (24) provided on the blocking block (2) via the rotation axis hole (411) and being provided on the blocking block (2), one end of the rod body I (42) and the rod body II (43) being connected to the rod base (41) via a ball joint (44), the free end of the rod body I (42) being provided with an internal thread, and the free end of the rod body II (43) being provided with an external thread, for connection with a rod body in an adjacent blocking device.

10. A method for using a plugging device for post-grouting of a tunnel support structure wall according to claim 9, characterized in that: The following steps are included: Step 1: After the tunnel corrugated steel support structure (5) is assembled, the guide groove (1) is fixedly installed on the end surface of the corrugated steel support structure (5) through the guide groove screw (11) and the bolt hole on the end surface of the corrugated steel support structure (5), and multiple guide grooves (1) are arranged in sequence along the end surface of the corrugated steel support structure (5). Step 2: insert the blocking block (2) into the blocking block limit groove (12) of the guide groove (1), and push the blocking block (2) to slide radially outward along the corrugated steel support structure (5) so that the wedge-shaped end (21) of the blocking block (2) is embedded in the surrounding rock, and the blocking block (2) and the guide groove (1) are locked with a locking bolt. Step 3: Connect the rod body I (42) and the rod body II (43) on the blocking block (2) in the adjacent blocking device in sequence through the internal thread of the free end of the rod body I (42) and the external thread of the free end of the rod body II (43), so as to reinforce the blocking surface formed by the blocking block (2). Step 4: The length of the folding slider (3) is adjusted through the folding slider adjustment window (232) so that it can completely cover the gap between the corrugated steel support structure (5) and the surrounding rock. The folding slider (3) is pushed out from the side of the blocking block (2) under the action of the spring (233). The outward end of the folding slider (3) is pressed against the side of the adjacent blocking block (2) without the folding slider installation groove (23) under the elastic force of the spring (233) to block the gap between the adjacent blocking blocks (2). Step 5: After the front end of the corrugated steel support structure (5) is sealed after the grouting is completed, grouting is performed on the back of the wall through the grouting hole. After the grouting is completed, the sealing device is removed and installed again when the next grouting is performed on the back of the wall.

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