A concrete anti-seepage method for repairing tunnel leakage

Abstract

The present invention belongs to the field of tunnel repair, and in particular to a concrete anti-seepage method for repairing tunnel water leakage. In view of the fact that existing tunnels are prone to water leakage at village masonry cracks, construction joints and other locations, and long-term water leakage leads to aggravated lining degradation, such as enlarged lining cracks, lining corrosion and peeling, and even falling blocks, the following scheme is proposed, which includes S1, investigating the water leakage situation, finding out the water source, the leakage location and the amount of leakage, and judging whether the leakage location is in a leaking state or in a state of having cracks but not leaking. In the present invention, radial grouting is performed on the leakage location to block water, and the crack location without leakage is blocked. For cracks with a width of t≤5mm in the arch, caulking materials can be used for caulking treatment in combination with water leakage diseases. For cracks with a width of t>5mm in the arch, anchor rods, polymer-modified cement-based repair mortar, grouting and carbon fiber cloth reinforcement are used.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel repair, and in particular to a concrete anti-seepage method for repairing tunnel leakage. Background Art

[0002] Tunnels are engineering structures buried in the ground, and are a form of human use of underground space. Tunnels can be divided into traffic tunnels, hydraulic tunnels, municipal tunnels, mining tunnels, and military tunnels. In 1970, the International Economic Cooperation and Development Organization held a tunnel conference that combined various factors and defined tunnels as: "A cavern with a cross-sectional area of ​​more than 2 square meters built underground by any method in a specified shape and size for a certain purpose.

[0003] Tunnels are prone to water leakage in cracks in masonry, construction joints and other places. Long-term water leakage leads to aggravated lining degradation, such as enlarged lining cracks, lining corrosion and peeling, and even falling blocks. In some sections, the leaked water collects in the ballast bed, softening the tunnel base. Under the repeated action of train loads, mud is formed, endangering driving safety. Therefore, we propose a concrete anti-seepage method for tunnel water leakage repair to solve the above-mentioned problems. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art that water leakage is very likely to occur in the cracks in the village masonry, construction joints and other parts of the tunnel. Long-term water leakage leads to aggravated lining deterioration, such as enlargement of lining cracks, corrosion and peeling of lining, and even falling of blocks. Leakage water in some sections collects on the roadbed, softens the tunnel base, and forms mud under the repeated action of train loads, endangering driving safety. A concrete anti-seepage method for repairing tunnel water leakage is proposed.

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

[0006] A concrete anti-seepage method for repairing tunnel water leakage, comprising S1, investigating the water leakage, finding out the water source, the leakage location and the leakage amount, and judging whether the leakage location is in a leaking state or in a state with cracks but no leakage;

[0007] S2. If it is leaking, generally for the serious leakage of the arch (linear or large-area leakage), radial grouting is used to plug the water. The grouting holes are arranged in plum blossom shape, with horizontal and vertical spacing of 1.0 to 2.0m. The specific spacing can be adjusted according to the on-site leakage situation and grouting effect;

[0008] S3. If there is a crack but no water leakage, determine the width of the crack;

[0009] S31. For arch cracks with a width of t≤5mm, the cracks can be treated by using caulking materials in combination with water leakage.

[0010] S32. For arch cracks with a width of t>5mm, such as mesh cracks, crescent cracks, cross cracks, circular cracks, and longitudinal, oblique, and circumferential cracks, anchor rods, polymer-modified cement-based repair mortar, grouting, and carbon fiber cloth reinforcement are used. The specific operations are as follows:

[0011] S321, a 4m long self-propelled grouting anchor rod with a diameter of 32mm is installed at intervals of about 1m along the longitudinal direction of the crack, and the anchor rods are staggered on both sides of the crack;

[0012] S322. Chisel a 5cm wide and 5cm deep groove along the crack extension direction. The groove length extends 10cm outward from the starting and ending points of the crack. Use a brush to clean the dust in the groove.

[0013] S323. Check the crack depth. If the crack depth is greater than 5 cm, install a grouting steel pipe every 150 cm. If the crack depth is less than 5 cm, no grouting pipe is installed.

[0014] S324, filled polymer modified cement-based repair mortar;

[0015] S325. After the polymer modified cement-based repair mortar reaches a certain strength, the reinforced TGRM cement-based special grouting material is injected through the grouting pipe, so that the grouting in the joint is full and connected, and air holes are left between the holes. When slurry is left in the air holes, it means that the slurry is full and connected;

[0016] S326. After the grouting is completed, cut off the exposed part of the grouting pipe, seal all the grouting holes with polymer-modified cement-based repair mortar, and smooth them;

[0017] S327. After the patching work is completed, a carbon fiber reinforcement layer is applied for reinforcement.

[0018] Preferably, the grouting parameters in step S2 are as follows: the drilling diameter is 50 mm, and the grouting pipe is a hot-rolled seamless steel pipe with an outer diameter of 42 mm and a thickness of 3.5 mm.

[0019] Preferably, the caulking material in step S31 is one of modified cement-based mortar and epoxy resin.

[0020] Preferably, the slurry in step S2 uses a waterproof TGRM cement-based special grouting material with a water-cement ratio of 0.6:1.

[0021] Preferably, the grouting pressure in step S2 is 0.4-0.6 MPa, and the grouting diffusion radius is 3 m.

[0022] Preferably, the front end of the steel pipe in step S2 is preferably made into a cone shape, a steel hoop is welded at the rear end, and a plum blossom-shaped overflow grout is arranged on the pipe body to facilitate the insertion of the grouting pipe into the surrounding rock.

[0023] Preferably, the water-cement ratio of the reinforced TGRM cement-based special grouting material in step S325 is 0.4:1.

[0024] Preferably, the grouting pressure in step S325 is 0.3 MPa to 0.5 MPa.

[0025] Preferably, in step S323, the diameter of the grouting steel pipe is 10 mm, the length is 9 to 11 cm, and the exposed pipe length is 2 to 3 cm.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. Radial grouting can be used to block water at the leakage location to solve the tunnel leakage problem;

[0028] 2. The cracks can be sealed to avoid water leakage.

[0029] In the present invention, the water leakage in the tunnel is solved by radially grouting the leakage position, and the crack position without leakage is sealed. For the cracks with a width of t≤5mm in the arch, the cracks can be treated by caulking materials in combination with the water leakage disease. For the cracks with a width of t>5mm in the arch, anchor rods, polymer-modified cement-based repair mortar, grouting and carbon fiber cloth reinforcement are used. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0031] Embodiment 1

[0032] A concrete anti-seepage method for repairing tunnel water leakage, comprising S1, investigating the water leakage, finding out the water source, the leakage location and the leakage amount, and judging whether the leakage location is in a leaking state or in a state with cracks but no leakage;

[0033] S2. If it is leaking, generally for linear or large-area leakage in the arch part with serious leakage, radial grouting is used to plug the water. The grouting holes are arranged in plum blossom shape, with a horizontal and vertical spacing of 1.0m. The specific spacing can be adjusted according to the on-site leakage situation and grouting effect;

[0034] S3. If there is a crack but no water leakage, determine the width of the crack;

[0035] S31. For arch cracks with a width of t≤5mm, the cracks can be treated by using caulking materials in combination with water leakage.

[0036] S32. For arch cracks with a width of t>5mm, such as mesh cracks, crescent cracks, cross cracks, circular cracks, and longitudinal, oblique, and circumferential cracks, anchor rods, polymer-modified cement-based repair mortar, grouting, and carbon fiber cloth reinforcement are used. The specific operations are as follows:

[0037] S321, a 4m long self-propelled grouting anchor rod with a diameter of 32mm is installed at intervals of about 1m along the longitudinal direction of the crack, and the anchor rods are staggered on both sides of the crack;

[0038] S322. Chisel a 5cm wide and 5cm deep groove along the crack extension direction. The groove length extends 10cm outward from the starting and ending points of the crack. Use a brush to clean the dust in the groove.

[0039] S323. Check the crack depth. If the crack depth is greater than 5 cm, install a grouting steel pipe every 150 cm. If the crack depth is less than 5 cm, no grouting pipe is installed.

[0040] S324, filled polymer modified cement-based repair mortar;

[0041] S325. After the polymer modified cement-based repair mortar reaches a certain strength, the reinforced TGRM cement-based special grouting material is injected through the grouting pipe, so that the grouting in the joint is full and connected, and air holes are left between the holes. When slurry is left in the air holes, it means that the slurry is full and connected;

[0042] S326. After the grouting is completed, cut off the exposed part of the grouting pipe, seal all the grouting holes with polymer-modified cement-based repair mortar, and smooth them;

[0043] S327. After the patching work is completed, a carbon fiber reinforcement layer is applied for reinforcement.

[0044] In the present invention, the grouting parameters in step S2 are as follows: the diameter of the drill hole is 50 mm, and the grouting pipe is a hot-rolled seamless steel pipe with an outer diameter of 42 mm and a thickness of 3.5 mm.

[0045] In the present invention, the caulking material in step S31 is one of modified cement-based mortar and epoxy resin.

[0046] In the present invention, the slurry in step S2 adopts a waterproof TGRM cement-based special grouting material with a water-cement ratio of 0.6:1.

[0047] In the present invention, the grouting pressure in step S2 is 0.4 MPa, and the grouting diffusion radius is 3 m.

[0048] In the present invention, the front end of the steel pipe in step S2 is preferably made into a cone shape, a steel hoop is welded at the rear end, and a plum blossom-shaped overflow grout is arranged on the pipe body, which can facilitate the insertion of the grouting pipe into the surrounding rock.

[0049] In the present invention, the water-cement ratio of the reinforced TGRM cement-based special grouting material in step S325 is 0.4:1.

[0050] In the present invention, the grouting pressure in step S325 is 0.3 MPaMPa.

[0051] In the present invention, the diameter of the grouting steel pipe in step S323 is 10 mm, the length is 9 cm, and the exposed pipe length is 2 cm.

[0052] Embodiment 2

[0053] A concrete anti-seepage method for repairing tunnel water leakage, comprising S1, investigating the water leakage, finding out the water source, the leakage location and the leakage amount, and judging whether the leakage location is in a leaking state or in a state with cracks but no leakage;

[0054] S2. If it is leaking, generally for linear or large-area leakage in the arch part with serious leakage, radial grouting is used to plug the water. The grouting holes are arranged in plum blossom shape, with a horizontal and vertical spacing of 1.0m. The specific spacing can be adjusted according to the on-site leakage situation and grouting effect;

[0055] S3. If there is a crack but no water leakage, determine the width of the crack;

[0056] S31. For arch cracks with a width of t≤5mm, the cracks can be treated by using caulking materials in combination with water leakage.

[0057] S32. For arch cracks with a width of t>5mm, such as mesh cracks, crescent cracks, cross cracks, circular cracks, and longitudinal, oblique, and circumferential cracks, anchor rods, polymer-modified cement-based repair mortar, grouting, and carbon fiber cloth reinforcement are used. The specific operations are as follows:

[0058] S321, a 4m long self-propelled grouting anchor rod with a diameter of 32mm is installed at intervals of about 1m along the longitudinal direction of the crack, and the anchor rods are staggered on both sides of the crack;

[0059] S322. Chisel a 5cm wide and 5cm deep groove along the crack extension direction. The groove length extends 10cm outward from the starting and ending points of the crack. Use a brush to clean the dust in the groove.

[0060] S323. Check the crack depth. If the crack depth is greater than 5 cm, install a grouting steel pipe every 150 cm. If the crack depth is less than 5 cm, no grouting pipe is installed.

[0061] S324, filled polymer modified cement-based repair mortar;

[0062] S325. After the polymer modified cement-based repair mortar reaches a certain strength, the reinforced TGRM cement-based special grouting material is injected through the grouting pipe, so that the grouting in the joint is full and connected, and air holes are left between the holes. When slurry is left in the air holes, it means that the slurry is full and connected;

[0063] S326. After the grouting is completed, cut off the exposed part of the grouting pipe, seal all the grouting holes with polymer-modified cement-based repair mortar, and smooth them;

[0064] S327. After the patching work is completed, a carbon fiber reinforcement layer is applied for reinforcement.

[0065] In the present invention, the grouting parameters in step S2 are as follows: the diameter of the drill hole is 50 mm, and the grouting pipe is a hot-rolled seamless steel pipe with an outer diameter of 42 mm and a thickness of 3.5 mm.

[0066] In the present invention, the caulking material in step S31 is one of modified cement-based mortar and epoxy resin.

[0067] In the present invention, the slurry in step S2 adopts a waterproof TGRM cement-based special grouting material with a water-cement ratio of 0.6:1.

[0068] In the present invention, the grouting pressure in step S2 is 0.5 MPa, and the grouting diffusion radius is 3 m.

[0069] In the present invention, the front end of the steel pipe in step S2 is preferably made into a cone shape, a steel hoop is welded at the rear end, and a plum blossom-shaped overflow grout is arranged on the pipe body, which can facilitate the insertion of the grouting pipe into the surrounding rock.

[0070] In the present invention, the water-cement ratio of the reinforced TGRM cement-based special grouting material in step S325 is 0.4:1.

[0071] In the present invention, the grouting pressure in step S325 is 0.4 MPa.

[0072] In the present invention, in step S323, the diameter of the grouting steel pipe is 10 mm, the length is 10 cm, and the exposed pipe length is 2 cm.

[0073] Embodiment 3

[0074] A concrete anti-seepage method for repairing tunnel water leakage, comprising S1, investigating the water leakage, finding out the water source, the leakage location and the leakage amount, and judging whether the leakage location is in a leaking state or in a state with cracks but no leakage;

[0075] S2. If it is leaking, generally for linear or large-area leakage in the arch part with serious leakage, radial grouting is used to plug the water. The grouting holes are arranged in plum blossom shape, with a horizontal and vertical spacing of 2.0m. The specific spacing can be adjusted according to the on-site leakage situation and grouting effect;

[0076] S3. If there is a crack but no water leakage, determine the width of the crack;

[0077] S31. For arch cracks with a width of t≤5mm, the cracks can be treated by using caulking materials in combination with water leakage.

[0078] S32. For arch cracks with a width of t>5mm, such as mesh cracks, crescent cracks, cross cracks, circular cracks, and longitudinal, oblique, and circumferential cracks, anchor rods, polymer-modified cement-based repair mortar, grouting, and carbon fiber cloth reinforcement are used. The specific operations are as follows:

[0079] S321, a 4m long self-propelled grouting anchor rod with a diameter of 32mm is installed at intervals of about 1m along the longitudinal direction of the crack, and the anchor rods are staggered on both sides of the crack;

[0080] S322. Chisel a 5cm wide and 5cm deep groove along the crack extension direction. The groove length extends 10cm outward from the starting and ending points of the crack. Use a brush to clean the dust in the groove.

[0081] S323. Check the crack depth. If the crack depth is greater than 5 cm, install a grouting steel pipe every 150 cm. If the crack depth is less than 5 cm, no grouting pipe is installed.

[0082] S324, filled polymer modified cement-based repair mortar;

[0083] S325. After the polymer modified cement-based repair mortar reaches a certain strength, the reinforced TGRM cement-based special grouting material is injected through the grouting pipe, so that the grouting in the joint is full and connected, and air holes are left between the holes. When slurry is left in the air holes, it means that the slurry is full and connected;

[0084] S326. After the grouting is completed, cut off the exposed part of the grouting pipe, seal all the grouting holes with polymer-modified cement-based repair mortar, and smooth them;

[0085] S327. After the patching work is completed, a carbon fiber reinforcement layer is applied for reinforcement.

[0086] In the present invention, the grouting parameters in step S2 are as follows: the diameter of the drill hole is 50 mm, and the grouting pipe is a hot-rolled seamless steel pipe with an outer diameter of 42 mm and a thickness of 3.5 mm.

[0087] In the present invention, the caulking material in step S31 is one of modified cement-based mortar and epoxy resin.

[0088] In the present invention, the slurry in step S2 adopts a waterproof TGRM cement-based special grouting material with a water-cement ratio of 0.6:1.

[0089] In the present invention, the grouting pressure in step S2 is 0.6 MPa, and the grouting diffusion radius is 3 m.

[0090] In the present invention, the front end of the steel pipe in step S2 is preferably made into a cone shape, a steel hoop is welded at the rear end, and a plum blossom-shaped overflow grout is arranged on the pipe body, which can facilitate the insertion of the grouting pipe into the surrounding rock.

[0091] In the present invention, the water-cement ratio of the reinforced TGRM cement-based special grouting material in step S325 is 0.4:1.

[0092] In the present invention, the grouting pressure in step S325 is 0.5 MPa.

[0093] In the present invention, in step S323, the diameter of the grouting steel pipe is 10 mm, the length is 11 cm, and the exposed pipe length is 3 cm.

[0094] Embodiment 4

[0095] A concrete anti-seepage method for repairing tunnel water leakage, comprising S1, investigating the water leakage, finding out the water source, the leakage location and the leakage amount, and judging whether the leakage location is in a leaking state or in a state with cracks but no leakage;

[0096] S2. If it is leaking, generally for linear or large-area leakage in the arch part with serious leakage, radial grouting is used to plug the water. The grouting holes are arranged in plum blossom shape, with a horizontal and vertical spacing of 2.0m. The specific spacing can be adjusted according to the on-site leakage situation and grouting effect;

[0097] S3. If there is a crack but no water leakage, determine the width of the crack;

[0098] S31. For arch cracks with a width of t≤5mm, the cracks can be treated by using caulking materials in combination with water leakage.

[0099] S32. For arch cracks with a width of t>5mm, such as mesh cracks, crescent cracks, cross cracks, circular cracks, and longitudinal, oblique, and circumferential cracks, anchor rods, polymer-modified cement-based repair mortar, grouting, and carbon fiber cloth reinforcement are used. The specific operations are as follows:

[0100] S321, a 4m long self-propelled grouting anchor rod with a diameter of 32mm is installed at intervals of about 1m along the longitudinal direction of the crack, and the anchor rods are staggered on both sides of the crack;

[0101] S322. Chisel a 5cm wide and 5cm deep groove along the crack extension direction. The groove length extends 10cm outward from the starting and ending points of the crack. Use a brush to clean the dust in the groove.

[0102] S323. Check the crack depth. If the crack depth is greater than 5 cm, install a grouting steel pipe every 150 cm. If the crack depth is less than 5 cm, no grouting pipe is installed.

[0103] S324, filled polymer modified cement-based repair mortar;

[0104] S325. After the polymer modified cement-based repair mortar reaches a certain strength, the reinforced TGRM cement-based special grouting material is injected through the grouting pipe, so that the grouting in the joint is full and connected, and air holes are left between the holes. When slurry is left in the air holes, it means that the slurry is full and connected;

[0105] S326. After the grouting is completed, cut off the exposed part of the grouting pipe, seal all the grouting holes with polymer-modified cement-based repair mortar, and smooth them;

[0106] S327. After the patching work is completed, a carbon fiber reinforcement layer is applied for reinforcement.

[0107] In the present invention, the grouting parameters in step S2 are as follows: the diameter of the drill hole is 50 mm, and the grouting pipe is a hot-rolled seamless steel pipe with an outer diameter of 42 mm and a thickness of 3.5 mm.

[0108] In the present invention, the caulking material in step S31 is one of modified cement-based mortar and epoxy resin.

[0109] In the present invention, the slurry in step S2 adopts a waterproof TGRM cement-based special grouting material with a water-cement ratio of 0.6:1.

[0110] In the present invention, the grouting pressure in step S2 is 0.6 MPa, and the grouting diffusion radius is 3 m.

[0111] In the present invention, the front end of the steel pipe in step S2 is preferably made into a cone shape, a steel hoop is welded at the rear end, and a plum blossom-shaped overflow grout is arranged on the pipe body, which can facilitate the insertion of the grouting pipe into the surrounding rock.

[0112] In the present invention, the water-cement ratio of the reinforced TGRM cement-based special grouting material in step S325 is 0.4:1.

[0113] In the present invention, the grouting pressure in step S325 is 0.5 MPa.

[0114] In the present invention, in step S323, the diameter of the grouting steel pipe is 10 mm, the length is 11 cm, and the exposed pipe length is 2 cm.

[0115] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A concrete anti-seepage method for repairing tunnel leakage, characterized in that: The following steps are involved: S1. Investigate the water leakage, find out the water source, leakage location and leakage amount, and determine whether the leakage is in a leaking state or in a cracked state without leakage; S2. If the water is leaking, radial grouting is used to plug the water in the arch with serious water leakage. The grouting holes are arranged in a plum blossom shape, with a horizontal and vertical spacing of 1.0 to 2.0 m. The specific spacing can be adjusted according to the on-site water leakage and the grouting effect. The grouting parameters in step S2 are as follows: the borehole diameter is 50 mm, the grouting pipe adopts a hot-rolled seamless steel pipe with an outer diameter of 42 mm and a thickness of 3.5 mm, and the slurry in step S2 adopts a waterproof TGRM cement-based special grouting material with a water-cement ratio of 0.6:1; S3. If there is a crack but no water leakage, determine the width of the crack; S31, for the cracks of the arch part with a width of t≤5mm, the cracks can be treated by using a caulking material in combination with water leakage. The caulking material in step S31 is one of modified cement-based mortar and epoxy resin; S32. For arch cracks with a width of t>5mm, such as mesh cracks, crescent cracks, cross cracks, circular cracks, and longitudinal, oblique, and circumferential cracks, anchor rods, polymer-modified cement-based repair mortar, grouting, and carbon fiber cloth reinforcement are used. The specific operations are as follows: S321, a 4m long self-propelled grouting anchor rod with a diameter of 32mm is installed at intervals of about 1m along the longitudinal direction of the crack, and the anchor rods are staggered on both sides of the crack; S322. Chisel a 5cm wide and 5cm deep groove along the crack extension direction. The groove length extends 10cm outward from the starting and ending points of the crack. Use a brush to clean the dust in the groove. S323. Check the crack depth. If the crack depth is greater than 5 cm, install a grouting steel pipe every 150 cm. If the crack depth is less than 5 cm, no grouting pipe is installed. S324, filled polymer modified cement-based repair mortar; S325. After the polymer modified cement-based repair mortar reaches a certain strength, the reinforced TGRM cement-based special grouting material is injected through the grouting pipe, so that the grouting in the joint is full and connected, and air holes are left between the holes. When slurry is left in the air holes, it means that the slurry is full and connected; S326. After grouting is completed, cut off the exposed part of the grouting pipe, seal all grouting holes with polymer-modified cement-based repair mortar, and smooth them; S327. After the patching work is completed, a carbon fiber reinforcement layer is applied for reinforcement.

2. A concrete anti-seepage method for repairing tunnel leakage according to claim 1, characterized in that: The grouting pressure in step S2 is 0.4-0.6 MPa, and the grouting diffusion radius is 3 m.

3. A concrete anti-seepage method for repairing tunnel leakage according to claim 1, characterized in that: The front end of the steel pipe in step S2 is preferably made into a cone shape, a steel hoop is welded at the rear end, and a plum blossom-shaped overflow grout is arranged on the pipe body to facilitate the insertion of the grouting pipe into the surrounding rock.

4. A concrete anti-seepage method for repairing tunnel leakage according to claim 1, characterized in that: The water-cement ratio of the reinforced TGRM cement-based special grouting material in step S325 is 0.4:

1.

5. The concrete anti-seepage method for repairing tunnel leakage according to claim 1, characterized in that: The grouting pressure in step S325 is 0.3 MPa to 0.5 MPa.

6. A concrete anti-seepage method for repairing tunnel leakage according to claim 1, characterized in that: In step S323, the diameter of the grouting steel pipe is 10 mm, the length is 9-11 cm, and the exposed pipe length is 2-3 cm.