A pretreatment device for repairing tunnel structure in soft and water-rich strata

Abstract

The present invention relates to the technical field of tunnel structure repair, and specifically discloses a pretreatment device for repairing a tunnel structure in a soft and water-rich stratum, comprising a base pipe, one end of the base pipe is threadedly connected to an end plate, one side of the end plate is rotatably connected to a center pipe, one end of the center pipe is detachably connected to a fixed pipe, one end of the fixed pipe is hinged to a plurality of swing arms through a spring hinge, one end of each swing arm is equipped with a cutter head, and the plurality of swing arms are fixedly connected to a flexible shielding member. The advantages of the present invention are: a pretreatment device for repairing a tunnel structure in a soft and water-rich stratum provided by the present invention forms a temporary partition plate in a cavity, and the partition plate can be used to temporarily block water, and the width of the partition plate is particularly small, and will not block irregular deep cracks, and slurry can easily enter the irregular deep cracks, and the filling effect is significantly improved compared with the prior art, and the filling and repair is safer and more reliable than the prior art.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel structure repair, and in particular to a pretreatment device for repairing a tunnel structure in a soft and water-rich stratum. Background Art

[0002] In the field of tunnel engineering, the construction of support structures (primary support and lining) is often affected by geological conditions, construction equipment, construction technology and management standards, and local defects may occur. Especially when water seepage occurs in soft and water-rich strata, if the water pressure is high or there are caves, it is likely to cause water and sand gushing, resulting in stratum loss and forming cavities behind the support structure, and then enter a vicious cycle of "water and sand gushing - stratum loss forming cavities - hydraulic channel expansion - water and sand gushing increases - stratum loss increases and cavities expand", which eventually causes stratum instability and endangers structural safety.

[0003] In this regard, CN202011347563.X discloses a pretreatment device and method for repairing a tunnel structure in a soft and water-rich stratum, see Fig. 9 As shown, when a cavity appears, a swimming ring type plugging capsule is placed in the cavity and filled with slurry to expand. After the slurry inside it quickly solidifies into a stone body, the breach is covered from the cavity outside the support structure to temporarily stop the gushing of water and sand, thereby preventing it from being washed away by the water flow before the slurry solidifies. However, in actual use of this method, since the cavity is irregular in shape, when the irregular deep crack is exactly at the position of the plugging capsule, the plugging capsule just blocks the irregular deep crack. In this way, during the later grouting process, the slurry cannot enter the space of this irregular deep crack. Although this will not temporarily affect the repair effect, after the repair, this irregular deep crack will directly form a hollow, so it is easy for water and sand to burst out with the hollow as the center in the later stage. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings existing in the prior art and to propose a pretreatment device for repairing a tunnel structure in a soft and water-rich stratum, thereby solving the problems existing in the prior art.

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

[0006] A pretreatment device for repairing a tunnel structure in a soft and water-rich stratum comprises a base pipe, one end of which is threadedly connected to an end plate, one side of which is rotatably connected to a central pipe, one end of the central pipe is detachably connected to a fixed pipe, one end of the fixed pipe is hinged to a plurality of swing arms via a spring hinge, one end of each swing arm is provided with a cutter head, and the plurality of swing arms are fixedly connected together to a flexible shielding member.

[0007] Preferably, the shielding member includes two coaxial and spaced-apart flexible rings, a sandwich is formed between the two flexible rings, the outer ring surfaces of the two flexible rings are commonly fixedly connected to the elastic ring, the two fixed rings are fixedly connected to the outside of the fixed tube, and the outer ring surfaces of the two fixed rings are fixedly connected to the inner ring surfaces of the two flexible rings in a one-to-one correspondence.

[0008] Preferably, a threaded sleeve is provided between the central tube and the fixed tube, and both the central tube and the fixed tube are threadedly connected to the threaded sleeve, so that the central tube and the fixed tube can be detachably fixed by the threaded sleeve.

[0009] Preferably, a grouting pipe is provided in the central pipe, one end of the grouting pipe is connected to the grouting interface, the other end of the grouting pipe extends into the fixed pipe and penetrates the pipe wall of the fixed pipe and extends out of the fixed pipe, and the end of the grouting pipe extending out of the fixed pipe is connected to the interlayer through a hose.

[0010] Preferably, the center of the end disc is fixedly connected to a rotating sleeve, and the central tube is rotatably connected inside the rotating sleeve.

[0011] Preferably, a plurality of grooves and protrusions are provided on the outer side of the swing arm.

[0012] The advantages of the present invention are as follows: a soft and water-rich stratum tunnel structure repair pretreatment device provided by the present invention forms a temporary partition plate in the cavity, which can temporarily block water, and the width of the partition plate is particularly small, which will not block the irregular deep cracks, and the slurry can easily enter the irregular deep cracks, and the filling effect is significantly improved compared with the existing technology, and the filling repair is safer and more reliable than the existing technology. The fixed pipe and the swing arm are permanently retained in the cavity, and the swing arm and the slurry form a whole after grouting. The swing arm can also serve as a skeleton, which greatly enhances the strength after repair. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a basic structural schematic diagram of the present invention;

[0014] Figure 2 It is a basic structural diagram when the swing arm is unfolded;

[0015] Figure 3 is a schematic diagram of the structure of the shielding member when the swing arm is unfolded;

[0016] Figure 4 is a structural cross-sectional view of the shielding member;

[0017] Figure 5 yes Figure 4 A magnified image of point A;

[0018] Figure 6 yes Figure 4 Schematic diagram of working status;

[0019] Figure 7It is a usage state diagram of the present invention;

[0020] Figure 8 It is a state diagram after the repair of the present invention is completed;

[0021] Fig. 9 It is a basic structural diagram of the prior art. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0023] like Figure 1-8 As shown, this embodiment discloses a pretreatment device for repairing a tunnel structure in a soft and water-rich stratum, comprising a base pipe 1, one end of the base pipe 1 is threadedly connected to an end plate 11, a rotating sleeve 12 is fixedly connected to the center of the end plate 11, a central pipe 13 is rotatably connected inside the rotating sleeve 12, one end of the central pipe 13 is detachably connected to a fixed pipe 2, a threaded sleeve 14 is provided between the central pipe 13 and the fixed pipe 2, the central pipe 13 and the fixed pipe 2 are both threadedly connected to the threaded sleeve 14, and the central pipe 13 and the fixed pipe 2 are detachably fixed by the threaded sleeve 14. The threaded connection method is a prior art and will not be repeated here.

[0024] One end of the fixed tube 2 is hinged to multiple swing arms 3 through a spring hinge. The spring hinge is a prior art. When the spring hinge is in a free state, the angle between the swing arm 3 and the fixed tube 2 is 60°. A cutter head 4 is installed at one end of each swing arm 3. Multiple swing arms 3 are fixedly connected to a flexible shielding member 5. When the swing arms 3 are fully unfolded, see Figure 3 As shown, the shielding member 5 is also fully unfolded, and when all the swing arms 3 are in contact with the fixed tube 2, the shielding member 5 is folded and contracted.

[0025] The shielding member 5 includes two coaxial and spaced flexible rings 51, a sandwich 54 is formed between the two flexible rings 51, the outer ring surfaces of the two flexible rings 51 are fixedly connected to the elastic ring 52, the outer side of the fixed pipe 2 is fixedly connected to the two fixed rings 53, and the outer ring surfaces of the two fixed rings 53 are fixedly connected to the inner ring surfaces of the two flexible rings 51 in a one-to-one correspondence. A grouting pipe is arranged in the central pipe 13, one end of the grouting pipe is connected to the grouting interface 15, and the other end of the grouting pipe extends into the fixed pipe 2 and penetrates the pipe wall of the fixed pipe 2 and extends out of the fixed pipe 2, and the end of the grouting pipe extending out of the fixed pipe 2 is connected to the sandwich 54 through the hose 6.

[0026] When in use, first make the swing arms 3 close to the fixed pipe 2, so that the overall volume of the soft water-rich stratum tunnel structure repair pretreatment device of this embodiment can be reduced, and the soft water-rich stratum tunnel structure repair pretreatment device can be inserted into the cavity from the hole as a whole, and then the swing arm 3 is opened, so that the cutter head on the swing arm 3 contacts the inner wall of the cavity, and the central tube 13 is rotated by the external rotating device, so that the fixed pipe 2 rotates with it, and the swing arm 3 also rotates accordingly, so that the inner wall of the cavity is cut by the cutter head on the swing arm 3, thereby cutting an annular groove in the inner wall of the cavity, and as the cutting proceeds, the angle between the swing arm 3 and the fixed pipe 2 is exactly 60°, and the width of the cut annular groove is also greater than the width of the cutter head. Grouting is performed along the grouting pipe and the hose 6 into the interlayer through the grouting interface 15. After the slurry is injected into the interlayer, an extrusion force will be generated on the elastic ring 52. Under the action of this extrusion force, the elastic ring 52 will expand and deform outward, so that the elastic ring 52 just contacts the inner wall of the annular groove. After the slurry reaches the strength, a temporary partition board is formed in the cavity. The partition board can temporarily block water, and the width of the partition board is particularly small, and the irregular deep cracks will not be blocked. Then, grouting is performed on the front and back sides of the partition board through the central tube 13 and the fixed tube 2, respectively, so that the slurry can easily enter the irregular deep cracks, and the filling effect is significantly improved compared with the prior art, and the filling repair is safe and reliable compared with the prior art. In addition, after the repair is completed, the fixed tube 2 is separated from the central tube, and the central tube is taken out. The fixed tube 2 and the swing arm 3 are permanently retained in the cavity. After grouting, the swing arm 3 and the slurry form a whole. The swing arm 3 can also serve as a skeleton, which greatly enhances the strength after repair. A plurality of grooves and protrusions are provided on the outer side of the swing arm 3, and the contact area between the swing arm 3 and the slurry can be increased through the grooves and the protrusions, thereby further improving the repair strength.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pretreatment device for repairing tunnel structure in soft and water-rich strata, characterized by: It comprises a base tube (1), one end of the base tube (1) is threadedly connected to an end plate (11), one side of the end plate (11) is rotatably connected to a center tube (13), one end of the center tube (13) is detachably connected to a fixed tube (2), one end of the fixed tube (2) is hingedly connected to a plurality of swing arms (3) via a spring hinge, one end of each swing arm (3) is provided with a cutter head (4), and the plurality of swing arms (3) are commonly fixedly connected to a flexible shielding member (5); The shielding member (5) comprises two coaxial and spaced-apart flexible rings (51), a sandwich (54) is formed between the two flexible rings (51), the outer ring surfaces of the two flexible rings (51) are fixedly connected to an elastic ring (52), the outer side of the fixed tube (2) is fixedly connected to two fixed rings (53), and the outer ring surfaces of the two fixed rings (53) are fixedly connected to the inner ring surfaces of the two flexible rings (51) in a one-to-one correspondence.

2. The pretreatment device for repairing a tunnel structure in a soft and water-rich stratum according to claim 1 is characterized by: A threaded sleeve (14) is provided between the central tube (13) and the fixed tube (2); the central tube (13) and the fixed tube (2) are both threadedly connected to the threaded sleeve (14); and the central tube (13) and the fixed tube (2) are detachably fixed via the threaded sleeve (14).

3. The pretreatment device for repairing a tunnel structure in a soft and water-rich stratum according to claim 2 is characterized by: A grouting pipe is provided in the central pipe (13), one end of the grouting pipe is connected to the grouting interface (15), the other end of the grouting pipe extends into the fixed pipe (2) and penetrates through the pipe wall of the fixed pipe (2) to extend out of the fixed pipe (2), and the end of the grouting pipe extending out of the fixed pipe (2) is connected to the interlayer (54) via a hose (6).

4. The pretreatment device for repairing a tunnel structure in a soft and water-rich stratum according to claim 1 is characterized by: The center of the end plate (11) is fixedly connected to a rotating sleeve (12), and the center tube (13) is rotatably connected inside the rotating sleeve (12).

5. The pretreatment device for repairing a tunnel structure in a soft and water-rich stratum according to claim 1 is characterized by: A plurality of grooves and protrusions are provided on the outer side of the swing arm (3).

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