A waterproof treatment method for cracks in segment lining of shield tunnel

Abstract

The present invention discloses a waterproof treatment method for cracks in segments of shield tunnels. The waterproof treatment method includes the following steps: Select a crack fastening box adapted to the size of the segment crack; Surround the segment crack with a square frame and fix the lower part of the square frame on the inner wall of the segment; Install a cover plate on the upper part of the square frame and press the crack fastening box against the inner wall of the segment by using a counter-pressure rod; Connect a pressure relief valve with a pressure gauge to the quick connector at the highest position among the quick connectors on the crack fastening box; Use the quick connectors except the quick connector connected with the pressure relief valve to inject waterproof material into the crack fastening box; Monitor the injection amount of the waterproof material in the segment crack, and after reaching the expected injection amount, let the waterproof material in the segment crack solidify; Recover the waterproof material inside the crack fastening box, and remove the crack fastening box and the counter-pressure rod. The advantages of the present invention are: It can avoid secondary damage to the segments of shield tunnels and conduct waterproof treatment for cracks in segments of shield tunnels economically, efficiently and reliably.

Description

Technical Field

[0001] The present invention relates to the technical field of waterproofing for segment cracks, and particularly to a waterproof treatment method for segment cracks in a shield tunnel. Background Art

[0002] Segment cracks in a shield tunnel may be caused by improper control of curing time, excessive stress during construction, or the influence of nearby engineering activities during the operation period. This may induce water leakage, thus affecting the service performance and durability of the shield tunnel. To solve the problem of water leakage through segment cracks, the existing methods mainly fall into two categories. One is to apply epoxy resin and stick waterproof fibers on the inner side, but its waterproof effect is poor, and water leakage is likely to occur again at high water pressure areas. The other is to inject waterproof materials into the cracks through deep holes, but this causes secondary damage to the cracks, and it is difficult for the waterproof materials to fill the entire crack. Therefore, it is crucial to economically, efficiently, and reliably treat the waterproofing of segment cracks in a shield tunnel. Summary of the Invention

[0003] The object of the present invention is to provide a waterproof treatment method for segment cracks in a shield tunnel according to the deficiencies of the above-mentioned existing technologies. By using a crack buckling box to surround the segment crack and squeezing the crack buckling box with an opposing pressure rod, and injecting waterproof materials into the crack buckling box, the repair of the segment crack is realized to achieve the purpose of waterproofing.

[0004] The object of the present invention is achieved by the following technical solutions:

[0005] A waterproof treatment method for segment cracks in a shield tunnel, characterized in that the waterproof treatment method comprises the following steps:

[0006] (S1) Select a crack buckling box adapted to the size of the segment crack. The crack buckling box includes a square box with upper and lower openings and a cover plate that mates with the upper part of the square box. The lower part of the square box fits with the inner wall of the segment, and quick connectors are provided on the four sides of the square box and on the cover plate.

[0007] (S2) Surround the segment crack with the square box, fix the lower part of the square box on the inner wall of the segment, and seal the space between the lower part of the square box and the inner wall of the segment.

[0008] (S3) Install the cover plate on the upper part of the square box, seal the space between the upper part of the square box and the cover plate, and use an opposing pressure rod to press the crack buckling box against the inner wall of the segment.

[0009] (S4) Connect a pressure relief valve with a pressure gauge to the quick connector at the highest position among the quick connectors on the crack buckling box.

[0010] (S5) Use a quick connector other than the quick connector connected to the pressure relief valve to inject waterproof material into the crack fastening box;

[0011] (S6) Monitor the injection volume of the waterproof material in the segment crack. After reaching the expected injection volume, let the waterproof material in the segment crack solidify; use the quick connector at the lowest position among the quick connectors on the crack fastening box to recover the waterproof material inside the crack fastening box, and remove the crack fastening box and the counter-pressure rod.

[0012] One lug is connected to each of the four corner positions at the lower part of the square box, and each lug is provided with an expansion bolt hole. The inner wall of the segment is provided with expansion bolt holes whose positions and numbers respectively correspond to the positions and numbers of the expansion bolt holes on the lugs. Through the cooperation of the expansion bolts with the lugs and the expansion bolt holes on the inner wall of the segment, the square box is fixed on the inner wall of the segment.

[0013] The counter-pressure rod is arranged along the radial direction of the segment. The counter-pressure rod is composed of multiple sections of steel pipes connected by flanges, and a length adjustment screw is arranged at one end of the counter-pressure rod close to the cover plate.

[0014] Glass glue is applied between the lower part of the square box and the inner wall of the segment.

[0015] A sealing ring is arranged between the upper part of the square box and the cover plate.

[0016] Reinforcing rib plates are arranged on the cover plate.

[0017] Connect a waterproof material injection pipe to the quick connector other than the quick connector connected to the pressure relief valve.

[0018] In step S5, the method of injecting waterproof material into the crack fastening box includes the following steps: open the pressure relief valve and inject waterproof material; after the air in the crack fastening box is exhausted, close the pressure relief valve and continue to inject waterproof material, wherein the slurry pressure at this time is controlled to be 2 times the externally estimated hydrostatic pressure.

[0019] In step S6, after the injection volume of the waterproof material in the segment crack reaches the expectation, control the slurry pressure at this time to be consistent with the externally estimated hydrostatic pressure, and let the waterproof material in the segment crack solidify.

[0020] The advantages of the present invention are: it can avoid secondary damage to the segments of the shield tunnel, and economically, efficiently and reliably conduct waterproof treatment for the cracks of the segments of the shield tunnel. Brief Description of the Drawings

[0021] Figure 1 It is a schematic diagram of the installation of the crack fastening box and the counter-pressure rod of the present invention;

[0022] Figure 2 This is a schematic diagram of the box structure of the present invention. Embodiment

[0023] The features of the present invention and other related features will be further described in detail below in conjunction with the accompanying drawings through embodiments for the understanding of those skilled in the same industry:

[0024] As Figure 1-2 shown, the markings 1 - 12 in the figure respectively represent: segment 1, segment crack 2, box 3, cover plate 4, quick joint 5, glass glue 6, sealing ring 7, reinforcing rib plate 8, counter - pressure rod 9, pressure gauge 10, pressure relief valve 11, lug 12.

[0025] Embodiment: As Figure 1-2 shown, this embodiment relates to a waterproof treatment method for segment cracks in a shield tunnel. The waterproof treatment method includes the following steps:

[0026] (S1) Select a crack - buckling box adapted to the size (length and shape) of the segment crack 2. Among them, the crack - buckling box includes a box 3 with upper and lower openings and a cover plate 4 that cooperates with the upper part of the box 3. The lower part of the box 3 fits with the inner wall of the segment 1, and quick joints 5 are provided on the four sides of the box 3 and the cover plate 4.

[0027] (S2) Make the box 3 surround the segment crack 2, fix the lower part of the box 3 on the inner wall of the segment 1, and seal the space between the lower part of the box 3 and the inner wall of the segment 1.

[0028] Specifically, an earpiece 12 is connected to each of the four corner positions of the lower part of the box 3. Each earpiece 12 is provided with an expansion bolt hole. The inner wall of the segment 1 is provided with expansion bolt holes whose positions and quantities respectively correspond to those of the expansion bolt holes on the earpiece 12. Through the cooperation of expansion bolts with the expansion bolt holes on the earpiece 12 and the inner wall of the segment 1, the box 3 is fixed on the inner wall of the segment 1. Glass glue 6 is applied between the lower part of the box 3 and the inner wall of the segment 1, and the glass glue 6 is in a chamfer shape.

[0029] (S3) Install the cover plate 4 on the upper part of the box 3, and seal the space between the upper part of the box 3 and the cover plate 4. Use the counter - pressure rod 9 to press the crack - buckling box against the inner wall of the segment 1. The counter - pressure rod 9 can ensure the stability of the crack - buckling box.

[0030] Specifically, a sealing ring 7 is provided between the upper part of the square box 3 and the cover plate 4. Reinforcing rib plates 8 are provided on the cover plate 4. The counter-pressure rod 9 is arranged radially along the segment 1. One end of the counter-pressure rod 9 is connected to the segment 1, and the other end presses against the cover plate 4. The counter-pressure rod 9 is formed by connecting multiple sections of steel pipes through flanges. The total length of the steel pipes of the counter-pressure rod 9 is equal to the distance from the reinforcing rib plate 8 to the inner wall of the opposite segment 1. A length adjustment screw rod is provided at one end of the counter-pressure rod 9 close to the cover plate 4. By adjusting the length of the length adjustment screw rod, the counter-pressure rod 9 presses against the cover plate 4.

[0031] (S4)Connect a pressure relief valve 11 with a pressure gauge 10 to the quick connector 5 at the highest position among the quick connectors 5 on the crack buckling box. The pressure gauge 10 is used to measure the pressure of the slurry.

[0032] (S5)Connect a waterproof material injection pipe to the quick connectors 5 except the quick connector 5 connected with the pressure relief valve 11. Inject waterproof materials into the crack buckling box through the waterproof material injection pipe and the quick connectors 5.

[0033] Specifically, the method of injecting waterproof materials into the crack buckling box includes the following steps: open the pressure relief valve 11 and inject waterproof materials; after the air in the crack buckling box is exhausted, close the pressure relief valve 11 and continue to inject waterproof materials. Among them, control the slurry pressure at this time (which can be measured by the pressure gauge 10) to be 2 times the externally estimated hydrostatic pressure.

[0034] (S6)Monitor the injection amount of the waterproof materials in the segment crack 2. After the injection amount of the waterproof materials in the segment crack 2 reaches the expectation, control the slurry pressure at this time (which can be measured by the pressure gauge 10) to be consistent with the externally estimated hydrostatic pressure and maintain it for a period of time to make the waterproof materials in the segment crack 2 solidify; utilize the quick connector 5 at the lowest position among the quick connectors 5 on the crack buckling box to recover the waterproof materials inside the crack buckling box, and remove the crack buckling box and the counter-pressure rod 9.

[0035] This embodiment also has the following beneficial effects: It can avoid secondary damage to the segments of the shield tunnel and conduct waterproof treatment for the cracks of the segments of the shield tunnel economically, efficiently and reliably.

[0036] Although the above embodiments have described in detail the concept and embodiments of the purpose of the present invention with reference to the accompanying drawings, those of ordinary skill in the art can recognize that various improvements and transformations can still be made to the present invention without departing from the scope defined by the claims. Therefore, they are not elaborated one by one here.

Claims

1. A waterproof treatment method for cracks in segment lining of shield tunnel, characterized in that The waterproof treatment method includes the following steps: S1: Select a crack snap box adapted to the size of the segment crack. The crack snap box includes a square box with upper and lower openings and a cover plate matching the upper part of the square box. The lower part of the square box fits the inner wall of the segment, and quick connectors are provided on the four sides of the square box and the cover plate. S2: Surround the segment crack with the square box, fix the lower part of the square box on the inner wall of the segment, and seal the space between the lower part of the square box and the inner wall of the segment. S3: Install the cover plate on the upper part of the square box, seal the space between the upper part of the square box and the cover plate, and press the crack snap box against the inner wall of the segment using a counter-pressure rod. S4: Connect a pressure relief valve with a pressure gauge to the quick connector at the highest position among the quick connectors on the crack snap box. S5: Inject waterproof material into the crack snap box through the quick connectors except the one connected with the pressure relief valve. S6: Monitor the injection volume of the waterproof material in the segment crack. After reaching the expected injection volume, let the waterproof material in the segment crack solidify. Recover the waterproof material inside the crack snap box through the quick connector at the lowest position among the quick connectors on the crack snap box, and remove the crack snap box and the counter-pressure rod. An ear plate is connected to each of the four corner positions of the lower part of the square box, and an expansion bolt hole is provided on each ear plate. Expansion bolt holes with corresponding positions and quantities are provided on the inner wall of the segment. The square box is fixed on the inner wall of the segment through the cooperation of expansion bolts with the ear plates and the expansion bolt holes on the inner wall of the segment. The counter-pressure rod is arranged along the radial direction of the segment. The counter-pressure rod is composed of multiple sections of steel pipes connected by flanges, and a length adjustment screw is provided at one end of the counter-pressure rod close to the cover plate.

2. The waterproof treatment method for the cracks of the segment in a shield tunnel according to claim 1, wherein: Glass glue is applied between the lower part of the square box and the inner wall of the segment.

3. The waterproof treatment method for the cracks of the segment in a shield tunnel according to claim 1, characterized in that: A sealing ring is provided between the upper part of the square box and the cover plate.

4. A waterproof treatment method for cracks in segments of shield tunnels according to claim 1, characterized in that: Reinforcing rib plates are provided on the cover plate.

5. The waterproof treatment method for the cracks of the segment in a shield tunnel according to claim 1, characterized in that: A waterproof material injection pipe is connected to the quick connectors except the one connected with the pressure relief valve.

6. The waterproof treatment method for the cracks of the segment in a shield tunnel according to claim 1, characterized in that: In step S5, the method of injecting waterproof material into the crack snap box includes the following steps: Open the pressure relief valve and inject the waterproof material. After the air in the crack snap box is exhausted, close the pressure relief valve and continue to inject the waterproof material, where the slurry pressure at this time is controlled to be 2 times the external estimated hydrostatic pressure.

7. The waterproof treatment method for cracks in segment of shield tunnel according to claim 1, characterized in that: In step S6, after the injection volume of the waterproof material in the segment crack reaches the expectation, control the slurry pressure at this time to be consistent with the external estimated hydrostatic pressure, and let the waterproof material in the segment crack solidify.

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