Device for repairing cavity behind tunnel lining

Abstract

The utility model discloses a device for repairing a cavity behind a tunnel lining, which comprises an inner pipe and an outer pipe, the outer pipe is sleeved outside the inner pipe, the outer pipe and the inner pipe are fixedly connected, an annular space is formed between the outer pipe and the outer pipe, the upper end part of the inner pipe protrudes out of the outer pipe, the lower end part of the annular space is provided with an outer grouting interface, and the outer grouting interface is connected with the inner pipe. The upper end of the annular space is connected with an annular blocking bag, the upper end of the inner pipe is sleeved with the annular blocking bag, the upper end of the inner pipe is connected with a grout outlet head, and the lower end of the inner pipe is provided with an inner grouting connector. The annular plugging bag used for plugging the grouting backflow channel is arranged at the upper end of the device, so that backflow of a tunnel belt mold grouting material can be effectively prevented, the grouting efficiency is improved, the filling rate of a cavity can be well guaranteed, and the repairing quality is improved. In addition, grouting materials can be saved, only the head is left in the stratum after repairing is completed, and cost can be saved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to tunnel engineering technical field, especially relate to a device for repairing tunnel lining behind the cavity. BACKGROUND

[0002] The cavity behind the tunnel lining has concealment, and potential harm is great, the cavity can unload the load of surrounding rock around it, makes the surrounding rock pressure of adjacent range redistribution, can lead to nearby ground pressure increase, makes the tunnel structure bear eccentric load and produce stress concentration phenomenon, can cause structure bearing capacity to be insufficient, makes the cavity place become the key of lining structure damage, even leads to collapse.

[0003] In actual construction process, when the cavity appears behind the lining, at present, the repair of the cavity is mainly completed through the supplementary grouting, although the grout can play the role of repair after consolidation, but the grout consolidation needs a certain time, cannot complete the repair of the cavity behind the tunnel lining quickly, and the fullness rate of the grout into the cavity is not good, thereby leading to low repair quality. SUMMARY

[0004] The utility model discloses a device for repairing the cavity behind the tunnel lining, which can quickly and high-quality complete the repair of the cavity behind the lining.

[0005] The utility model discloses a device for repairing the cavity behind the tunnel lining, which can quickly and high-quality complete the repair of the cavity behind the lining.

[0006] The grout head is connected with the inner tube through buckle and thread.

[0007] The device is composed of three units of upper, middle and lower, the upper unit includes the inner tube head, the outer tube head, the grout head and the annular sealing bag, the middle unit includes the inner tube and the outer tube, and the lower unit includes the inner tube tail and the outer tube tail, and the pipe sections adjacent to each other are connected through buckle and thread.

[0008] The grout head is provided with a top sealing plate A and a plurality of lateral grout outlets uniformly distributed along the circumference.

[0009] The slurry outlet head is provided with a hemispherical top and a bottom and lateral slurry outlet ports which are uniformly distributed in the circumferential direction, and a downward slope is arranged below the bottom and lateral slurry outlet ports.

[0010] The slurry outlet head is provided with a top plate B and a cylindrical outer sidewall, and a plurality of slurry outlet holes are uniformly arranged on the cylindrical outer sidewall.

[0011] The utility model has the advantages and positive effects that: the annular plugging bag for plugging the grouting backflow channel is arranged at the upper end, the backflow of the tunnel with mold grouting material can be effectively prevented, the filling rate of the cavity can be ensured and the repair quality can be improved while the grouting efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a state schematic view when the utility model is inserted into the grouting hole;

[0013] Figure 2 It is a structure exploded schematic view of the utility model;

[0014] Figure 3 It is a structure schematic view of the first slurry outlet head of the utility model;

[0015] Figure 4 It is a structure schematic view of the second slurry outlet head of the utility model;

[0016] Figure 5 It is a structure schematic view of the third slurry outlet head of the utility model;

[0017] Figure 6 It is a connection schematic view between the pipe sections of the utility model;

[0018] Figure 7 It is a schematic view of the annular plugging bag of the utility model after expansion;

[0019] Figure 8 It is a schematic view of repairing the cavity by injecting the tunnel with mold grouting material by the utility model;

[0020] Figure 9 It is a state schematic view after repairing the cavity by the utility model.

[0021] Figure: 1-1, inner tube head; 1-2, outer tube head; 2-1, inner tube; 2-2, outer tube; 3-1, inner tube tail; 3-2, outer tube tail; 4, slurry outlet head; 4-1-1, top plate A; 4-1-2, lateral slurry outlet; 4-2-1, hemispherical top; 4-2-2, bottom and lateral slurry outlet; 4-2-3, downward slope; 4-3-1, top plate B; 4-3-2, cylindrical outer sidewall; 4-3-3, slurry outlet hole; 5, exhaust pipe; 6, annular sealing bag. DETAILED DESCRIPTION

[0022] In order to further understand the invention content, characteristics and effects of the present application, the following examples are given, and the detailed description is as follows in conjunction with the drawings:

[0023] Please refer to Figures 1-9 A device for repairing the cavity behind the tunnel lining, comprising an inner tube and an outer tube, the outer tube is sleeved on the outside of the inner tube, and the two are fixedly connected to form an annular space therebetween, the upper end of the inner tube protrudes from the outer tube, an external grouting interface is arranged at the lower end of the annular space, an annular sealing bag 6 is connected to the upper end of the annular space, the annular sealing bag 6 is sleeved on the upper end of the inner tube, and the upper end of the inner tube is connected with a slurry outlet head 4 and the lower end is provided with an internal grouting interface.

[0024] In the embodiment, the slurry outlet head 4 is connected with the inner tube through buckling and threading, facilitating replacement of the slurry outlet head. The device is composed of three units, i.e. an upper unit, a middle unit and a lower unit. The upper unit comprises the inner tube head 1-1, the outer tube head 1-2, the slurry outlet head 4 and the annular sealing bag 6, the middle unit comprises the inner tube 2-1 and the outer tube 2-2, and the lower unit comprises the inner tube tail 3-1 and the outer tube tail 3-2. The adjacent pipe sections are connected through buckling and threading, and the connection is reliable and easy to disassemble.

[0025] The structure of the slurry outlet head can be determined according to the specific conditions of the cavity. In the embodiment, the slurry outlet head 4 can adopt any one of the following three structures.

[0026] Please refer to Figure 3 The slurry outlet head 4 is provided with a top plate A 4-1-1 and a plurality of circumferentially distributed lateral slurry outlets 4-1-2, and the slurry is uniformly discharged with large flow.

[0027] Please refer to Figure 4 The slurry outlet head 4 is provided with a hemispherical top 4-2-1 and a plurality of circumferentially distributed bottom and lateral slurry outlets 4-2-2, and a downward slope 4-2-3 is arranged below the bottom and lateral slurry outlets 4-2-2 for preventing back seepage of the slurry. This structure has a larger slurry discharge capacity.

[0028] Please refer to Figure 5The slurry outlet head 4 is provided with a top sealing plate B4-3-1 and a cylindrical outer side wall 4-3-2, and a plurality of slurry outlet holes 4-3-3 are uniformly arranged on the cylindrical outer side wall 4-3-2, and the slurry outlet uniformity is high.

[0029] The tunnel lining back cavity repairing method is performed by using the device, and the following steps are adopted:

[0030] 1) determining the cavity position; preparing the device, and arranging a waterproof elastic protective sleeve outside the annular sealing bag 6,

[0031] 2) arranging a slurry inlet hole and an exhaust hole at the position corresponding to the cavity,

[0032] 3) inserting the exhaust pipe 5 into the exhaust hole and inserting the device into the slurry inlet hole, so that the upper end of the device penetrates out of the lining layer and enters the cavity;

[0033] 4) injecting cement mortar into the annular sealing bag 6 through the external grouting interface, so that the annular sealing bag 6 expands, breaks the waterproof elastic protective sleeve, and seals the gap between the inner pipe and the slurry inlet hole in the cavity outside the lining structure; after the cement mortar solidifies, tunnel zone mold grouting material is injected into the cavity through the internal grouting interface until the slurry overflows from the exhaust pipe 5, and the tunnel zone mold grouting material contains superfine mineral admixtures. The tunnel zone mold grouting material is a commercially available product.

[0034] 5) after the tunnel zone mold grouting material solidifies, the exposed part of the device is recovered, and the lining structure is repaired.

[0035] The recommended distance between the exhaust hole and the slurry inlet hole is 50cm-150cm.

[0036] The tunnel zone mold grouting material is used to repair the cavity, and because the tunnel zone mold grouting material is mixed with superfine mineral admixtures, the void structure of the mortar can be improved, the impermeability, durability and strength of the mortar can be improved, the grouting material is difficult to segregate and bleed water, the grouting material can quickly solidify after the slurry flows out of the exhaust hole, the grouting fullness rate is improved, the stratum is improved, and the cavity repair quality is improved.

[0037] Although the preferred embodiments of the utility model are described above in combination with the drawings, the utility model is not limited to the above-mentioned specific embodiments, the above-mentioned specific embodiments are only illustrative and are not restrictive, and those skilled in the art can make many forms under the inspiration of the utility model without departing from the purpose of the utility model and the scope protected by the claims, and these all belong to the protection scope of the utility model.

Claims

1. A device for repairing a cavity behind a tunnel lining, characterized in that The device comprises an inner tube and an outer tube, the outer tube is sleeved outside the inner tube, the two are fixedly connected, an annular space is formed between the two, the upper end of the inner tube protrudes from the outer tube, An outer grouting interface is arranged at the lower end of the annular space, and an annular sealing bag is connected to the upper end of the annular space, the annular sealing bag is sleeved on the upper end of the inner tube, the upper end of the inner tube is connected with a grouting head, and the lower end is provided with an inner grouting interface.

2. The device for repairing a void behind a tunnel lining according to claim 1, characterized in that The grouting head is connected with the inner tube through buckling and threading.

3. The device for repairing a void behind a tunnel lining according to claim 1, characterized in that, The device is composed of upper, middle and lower units, the upper unit comprises an inner tube head, an outer tube head, the grouting head and the annular sealing bag, the middle unit comprises the inner tube and the outer tube, and the lower unit comprises an inner tube tail and an outer tube tail, the adjacent tube segments are connected through buckling and threading.

4. The apparatus for repairing a void behind a tunnel lining according to claim 1, wherein The grouting head is provided with a top sealing plate A and a plurality of circumferentially distributed lateral grouting ports.

5. The apparatus for repairing a void behind a tunnel lining according to claim 1, wherein The grouting head is provided with a hemispherical top sealing plate and circumferentially distributed bottom and lateral grouting ports, and a downward slope is arranged below the bottom and lateral grouting ports.

6. The apparatus for repairing a void behind a tunnel lining according to claim 1, wherein The grouting head is provided with a top sealing plate B and a cylindrical outer side wall, and a plurality of grouting holes are uniformly arranged on the cylindrical outer side wall.

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