CN111441311B - Underwater repair method for leakage of old dam structure seam - Google Patents
Underwater repair method for leakage of old dam structure seam Download PDFInfo
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- CN111441311B CN111441311B CN202010302989.7A CN202010302989A CN111441311B CN 111441311 B CN111441311 B CN 111441311B CN 202010302989 A CN202010302989 A CN 202010302989A CN 111441311 B CN111441311 B CN 111441311B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/16—Sealings or joints
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Abstract
The invention discloses an underwater repairing method for leakage of a structure joint of an old dam, and belongs to the technical field of hydraulic engineering. The invention punches a hole between the copper water stop and the plastic water stop of the original dam body structure joint to fill the flexible grouting material, a new water stop is formed from the bedrock to the dam top, the filled flexible grouting material can also block the leakage channel around the original copper water stop and the plastic water stop, the water stop formed by the flexible grouting material not only forms three waterproof systems together with the copper water stop and the plastic water stop, but also forms a complete three closed water stop system together with the water stop formed by the flexible grouting material, the copper water stop and the plastic water stop, so that the water stop system of the original structure joint is recovered and perfected, and the leakage is completely stopped.
Description
Technical Field
The invention relates to the technical field of hydraulic engineering, in particular to an underwater repairing method for leakage of a structure joint of an old dam.
Background
The dam has the functions of flood control, irrigation, power generation, shipping, water supply and the like. In the construction process of the concrete dam, the water stopping periphery of a structural joint has the defects of incompact concrete vibration and poor combination of a water stopping belt and concrete, so that leakage channels such as honeycombs, holes and the like appear on the periphery of the concrete; these problems and defects are one of the main causes of leakage at the joints of concrete dam structures. In addition, in the construction process of the structural joint, the problems of poor treatment of the water stop joint, damage of the water stop, poor quality of the water stop and the like can directly cause the leakage of the structural joint. Leakage can cause a series of safety problems, which seriously affect the safety of people's lives and properties.
Therefore, a new seepage-proofing panel is added between the old panel and the new panel, and if the new seepage-proofing panel can reach the bedrock and be made into a closed body, the dam can be stopped. However, due to the existence of the underwater stone-masonry slope, water sealing of the seam of the dam face cannot penetrate into the bedrock, a channel is formed between the new water sealing structure and the old water sealing structure, the seam of the new structure and the seam of the old structure cannot be sealed, the possibility of seepage of water flow exists, and the risk of dam seepage is increased.
Therefore, in order to solve the problem that the old dam cannot be ill due to the penetration of the old dam and the leakage of the structural joint exists in the operation process, the underwater repairing method adopted in the field at present comprises the following steps: grouting curtains, impervious walls, underwater joint water stop, grouting of water leakage pipes and guide pipes and the like. However, for older dams, the seepage-proofing panels cannot extend to bedrock, so that the structural joints cannot be closed, and therefore, the traditional leakage repairing method has potential risks and causes larger leakage.
Disclosure of Invention
The invention aims to provide an underwater repairing method for leakage of an old dam structure seam, which aims to solve the problem that the existing traditional leakage repairing method has potential risks and can cause larger leakage.
The technical scheme for solving the technical problems is as follows:
an underwater repairing method for leakage of old dam structure seams comprises the following steps:
s1: at the position, close to the top of the slope, of the straight surface of the upstream surface of the old dam, a grouting hole is drilled by riding a structural joint, and the bottom of the grouting hole is close to the copper water stop;
s2: a blocking piece is adopted to tightly block a structural seam below the grouting hole;
s3: injecting an underwater adhesive into the grouting hole, and adopting an embedding material to densely embed and tightly fill a structural joint between the grouting hole and the blocking piece;
s4: mounting a T-shaped water stop in a structural joint above the grouting hole;
s5: and (4) extending the grouting pipe into the grouting hole, and pouring flexible grouting material into the grouting hole.
The invention punches a hole between the copper water stop and the plastic water stop of the original dam body structure joint to fill the flexible grouting material, a new water stop is formed from the bedrock to the dam top, the filled flexible grouting material can also block the leakage channel around the original copper water stop and the plastic water stop, the water stop formed by the flexible grouting material not only forms three waterproof systems together with the copper water stop and the plastic water stop, but also forms a complete three closed water stop system together with the water stop formed by the flexible grouting material, the copper water stop and the plastic water stop, so that the water stop system of the original structure joint is recovered and perfected, and the leakage is completely stopped.
Further, after the step S5, the method further includes a step S6: and a plurality of anti-seepage panels are arranged on the straight surface of the upstream surface of the dam, anti-seepage panel water stops are adhered between adjacent anti-seepage panels at positions corresponding to the structural joints, and the anti-seepage panel water stops are connected with the T-shaped water stops in a sealing manner from the bottoms of the anti-seepage panels by adopting an underwater sealant.
The water stop belt of the newly added seepage-proofing panel is closed with the T-shaped water stop belt at the original dam surface, the T-shaped water stop belt at the original dam surface is closed with the copper water stop belt in the structural joint, the copper water stop belt, the plastic water stop belt and the flexible grouting material form a closed water stop system, and the water stop belt of the newly added seepage-proofing panel is closed, so that the water stop system of the original structural joint is recovered and is more perfect, and the leakage is completely stopped.
Further, in the step S6, after the construction of the impermeable panels is completed, the impurities in the structural joints between the impermeable panels are cleaned up by using high-pressure water.
Further, in the step S6, the impermeable panel is connected to the dam body by anchor bars, the diameter of the anchor bars is greater than or equal to 20mm, and the anchoring depth of the anchor bars is greater than or equal to 300 mm.
The invention can stably and durably support the gravity of the anti-seepage panel by increasing the diameter of the anchor bar and the anchoring depth of the anchor bar.
Further, in step S1, the distance between the bottom of the grouting hole and the copper seal is 60mm or more.
The distance between the bottom of the grouting hole and the copper water stop can ensure that the copper water stop is not damaged in the drilling process.
Further, between the above steps S1 and S2, the method further includes step S11: and cleaning up impurities in the structural joint and the grouting hole at the upstream of the copper water stop by adopting high-pressure water.
Further, in the step S5, after the grouting pipe extends into the grouting hole, the opening of the grouting hole is sealed by using an underwater sealant; after the flexible grouting material is initially set, removing the underwater sealant and the grouting pipe, embedding and filling the inside of the grouting hole tightly by using an embedding material and an underwater adhesive, and adhering a cover plate to the hole opening of the grouting hole for sealing.
According to the invention, the opening of the grouting hole is compacted before grouting, and the grout flows in the structural joint and the leakage channel around the copper water stop and the plastic water stop, so that the grout is prevented from overflowing from the grouting hole, and the misjudgment of whether grouting is finished or not can be avoided.
Further, the flexible grouting material is a mixture of water-soluble polyurethane HW, water-soluble polyurethane LW and bentonite or a mixture of water-soluble polyurethane HW, water-soluble polyurethane LW and superfine cement.
Further, the embedding material is rubber.
Further, the underwater sealant is an SXM underwater sealant.
The invention has the following beneficial effects:
the invention punches a hole between the copper water stop and the plastic water stop of the original dam body structure joint to fill the flexible grouting material, a new water stop is formed from the bedrock to the dam top, the filled flexible grouting material can also block the leakage channel around the original copper water stop and the plastic water stop, the water stop formed by the flexible grouting material not only forms three waterproof systems together with the copper water stop and the plastic water stop, but also forms a complete three closed water stop system together with the water stop formed by the flexible grouting material, the copper water stop and the plastic water stop, so that the water stop system of the original structure joint is recovered and perfected, and the leakage is completely stopped.
Drawings
FIG. 1 is a schematic cross-sectional view of a dam along a structural joint as grouting pipe installation is completed according to the present invention;
FIG. 2 is a schematic cross-sectional view of a dam along a structural seam with the completion of cover sheet installation in accordance with the present invention;
FIG. 3 is a schematic cross-sectional view of a dam along a structural joint as the installation of an impermeable panel waterstop of the present invention is completed.
In the figure: 10-upstream surface of the dam; 20-straight surface; 30-slope; 40-grouting holes; 50-copper water stop; 60-plastic water stopping; 70-a blocking member; 80-T type water stop belts; 90-grouting pipes; 100-flexible grouting material; 110-an impermeable panel; 120-impermeable panel water stop; 130-cover slip.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
Examples
Referring to fig. 1 to 3, an underwater repairing method for leakage of a seam of an old dam structure is characterized by comprising the following steps:
s1: in the position that the straight surface 20 of the upstream surface 10 of the dam is close to the top of the slope 30, the grouting holes 40 are drilled by riding structural joints, the hole bottoms of the grouting holes 40 are close to the copper water stop 50, the hole diameter of each grouting hole 40 is 150mm, in order to ensure that the copper water stop 50 cannot be damaged in the drilling process, the distance between the hole bottom of each grouting hole 40 and the copper water stop 50 is more than or equal to 60mm, and in the embodiment, the distance between the hole bottom of each grouting hole 40 and the copper water stop 50 is 60 mm;
s2: cleaning up sundries in the structural joint at the upstream of the copper water stop 50, namely the sundries in the structural joint at the side of the copper water stop 50 close to the upstream face 10 of the dam and the sundries in the grouting holes 40 by adopting high-pressure water;
s3: a blocking piece 70 is adopted to tightly block a structural seam 100mm below the grouting hole 40; in this embodiment, the blocking member 70 is a rubber rod, the diameter of which depends on the particular width of the structural slot;
s4: injecting underwater adhesive into the grouting hole 40, placing embedding materials in the grouting hole 40, and tightly embedding the structural joint between the grouting hole 40 and the blocking piece 70 through the underwater adhesive and the embedding materials so as to prevent the flexible grouting material 100 from leaking from the structural joint between the grouting hole 40 and the blocking piece 70;
s5: a T-shaped water stop belt 80 is arranged in a structural joint above the grouting hole 40, the T-shaped water stop belt 80 extends to the top side of the grouting hole 40, and the flexible grouting material 100 is prevented from leaking from the structural joint above the grouting hole 40;
s6: the grouting pipe 90 extends into the grouting hole 40, the pipe orifice of the grouting pipe 90 is close to the hole bottom of the grouting hole 40, the orifice of the grouting hole 40 is sealed by adopting an underwater sealant, and the flexible grouting material 100 is prevented from leaking from the orifice of the grouting hole 40;
s7: the flexible grouting material 100 is poured into the dam through the grouting pipe 90, after the flexible grouting material 100 is solidified, a new water stop is formed from the bedrock to the top of the dam, and the flexible grouting material 100 can also block the leakage channels around the original copper water stop 50 and the plastic water stop 60; the water stop formed by the flexible grouting material 100 not only forms a 3-channel waterproof system together with the copper water stop 50 and the plastic water stop 60, but also forms a complete water stop system together with the water stop formed by the flexible grouting material 100, the copper water stop 50 and the plastic water stop 60, so that the water stop system of the original structural joint is recovered and perfected, and the leakage is completely prevented;
s8: after the flexible grouting material 100 is initially set, removing the underwater sealant and the grouting pipe 90 exposed outside the dam;
s9: pasting a cover plate 130 at the orifice of the grouting hole 40, and sealing the grouting hole 40;
s10: installing a plurality of anti-seepage panels 110 on the straight surface 20 of the upstream surface 10 of the dam, wherein the anti-seepage panels 110 are connected with the dam through anchor bars; in order to stably and durably support the gravity of the impervious panel 110, the diameter of the anchor bar is more than or equal to 20mm, and the anchoring depth of the anchor bar is more than or equal to 300 mm; in the embodiment, the diameter of the anchor bar is 20mm, and the anchoring depth of the anchor bar is 300 mm;
s11: after the construction of the anti-seepage panels 110 is finished, cleaning up sundries of structural joints between the anti-seepage panels 110 by adopting high-pressure water;
s12: and (3) adhering an impermeable panel water stop strip 120 at the position corresponding to the structural seam between the adjacent impermeable panels 110, wherein the impermeable panel water stop strip 120 extends to the bottom of the impermeable panel 110 and is connected with the T-shaped water stop strip 80 in a sealing manner by adopting an underwater sealant.
In this embodiment, the underwater adhesive is an SXM underwater adhesive, and the embedded material and the cover sheet 130 are made of rubber; the flexible grouting material 100 is a mixture of water-soluble polyurethane HW, water-soluble polyurethane LW and bentonite. In other embodiments of the present invention, the flexible grouting material 100 may also be a mixture of water-soluble polyurethane HW, water-soluble polyurethane LW and ultra-fine cement.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. An underwater repairing method for leakage of an old dam structure seam is characterized by comprising the following steps:
s1: at the position, close to the top of the slope (30), of the straight surface (20) of the upstream surface (10) of the old dam, a grouting hole (40) is drilled by riding a structural seam, and the bottom of the grouting hole (40) is close to the copper water stop (50);
s2: a blocking piece (70) is adopted to tightly block the structural seam below the grouting hole (40);
s3: injecting an underwater adhesive into the grouting hole (40), and adopting an embedded material to densely and compactly fill a structural joint between the grouting hole (40) and the blocking piece (70);
s4: a T-shaped water stop (80) is arranged in a structural seam above the grouting hole (40);
s5: the grouting pipe (90) is stretched into the grouting hole (40), the opening of the grouting hole (40) is sealed by adopting an underwater sealant, and the flexible grouting material (100) is poured into the grouting hole (40); after the flexible grouting material (100) is initially set, removing the underwater sealant and the grouting pipe (90) exposed outside the old dam, and adhering a cover plate (130) to the opening of the grouting hole (40) for sealing.
2. The underwater repair method for leakage of old dam structural joint according to claim 1, wherein after step S5, there is further step S6: a plurality of anti-seepage panels (110) are installed on the straight surface (20) of the upstream surface (10) of the old dam, anti-seepage panel water stops (120) are pasted between the adjacent anti-seepage panels (110) corresponding to the positions of the structural seams, and the anti-seepage panel water stops (120) are connected with the T-shaped water stops (80) in a sealing mode from the bottoms of the anti-seepage panels (110) by adopting an underwater sealant.
3. The underwater repair method for the leakage of the structural joint of the old dam according to claim 2, wherein in step S6, after the construction of the impervious panels (110) is completed, the sundries in the structural joint between the impervious panels (110) are cleaned up by high-pressure water.
4. The underwater repair method for the leakage of the old dam structure seam according to claim 3, wherein in step S6, the seepage-proofing panel (110) is connected with the dam body by anchor bars, the diameter of the anchor bars is more than or equal to 20mm, and the anchoring depth of the anchor bars is more than or equal to 300 mm.
5. The underwater repair method for leakage of old dam structure seam according to any of claims 1 to 4, characterized in that in step S1, the distance between the bottom of the grouting hole (40) and the copper water stop (50) is greater than or equal to 60 mm.
6. The underwater repair method for leakage of old dam structure seam according to claim 5, wherein between the steps S1 and S2, further comprising the steps S11: and (3) cleaning up sundries in the structural joint and the grouting hole (40) at the upstream of the copper water stop (50) by adopting high-pressure water.
7. The underwater repair method for leakage of old dam structure joint according to claim 6, characterized in that said flexible grouting material (100) is a mixture of water-soluble polyurethane HW, water-soluble polyurethane LW and bentonite or a mixture of water-soluble polyurethane HW, water-soluble polyurethane LW and ultra-fine cement.
8. The underwater repair method for leakage of old dam structural joint according to claim 7, wherein said infill material is rubber.
9. The underwater repair method for leakage of old dam structural joints according to claim 8, characterized in that the underwater sealant is SXM underwater sealant.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010302989.7A CN111441311B (en) | 2020-04-17 | 2020-04-17 | Underwater repair method for leakage of old dam structure seam |
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| CN202010302989.7A CN111441311B (en) | 2020-04-17 | 2020-04-17 | Underwater repair method for leakage of old dam structure seam |
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| CN111441311A CN111441311A (en) | 2020-07-24 |
| CN111441311B true CN111441311B (en) | 2021-01-26 |
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| CN112813926B (en) * | 2021-01-06 | 2021-12-31 | 四川省水利科学研究院 | Hydraulic engineering seam-crossing rear-mounted built-in water stop assembly structure and construction method |
| CN117211235B (en) * | 2023-11-09 | 2024-02-06 | 水利部交通运输部国家能源局南京水利科学研究院 | Panel dam impervious wall leakage disease repairing method |
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| JPH08232240A (en) * | 1995-02-24 | 1996-09-10 | Fujita Corp | Soil sealing structure of embankment joint |
| CN207469188U (en) * | 2017-11-17 | 2018-06-08 | 中国电建集团成都勘测设计研究院有限公司 | The impervious reparation structure of cushion pool structural joint |
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