CN110984160B - Underwater repair method for water seepage crack of concrete panel - Google Patents
Underwater repair method for water seepage crack of concrete panel Download PDFInfo
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- CN110984160B CN110984160B CN201911075073.6A CN201911075073A CN110984160B CN 110984160 B CN110984160 B CN 110984160B CN 201911075073 A CN201911075073 A CN 201911075073A CN 110984160 B CN110984160 B CN 110984160B
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- 239000004567 concrete Substances 0.000 title claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000008439 repair process Effects 0.000 title description 4
- 239000000463 material Substances 0.000 claims abstract description 31
- 239000002131 composite material Substances 0.000 claims abstract description 11
- 239000010881 fly ash Substances 0.000 claims description 14
- 239000004568 cement Substances 0.000 claims description 11
- 239000000565 sealant Substances 0.000 claims description 10
- 229910001220 stainless steel Inorganic materials 0.000 claims description 9
- 239000010935 stainless steel Substances 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000004576 sand Substances 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 230000001680 brushing effect Effects 0.000 claims description 4
- 239000003566 sealing material Substances 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 2
- 239000000843 powder Substances 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 17
- 238000007789 sealing Methods 0.000 abstract description 9
- 230000008569 process Effects 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000002360 preparation method Methods 0.000 abstract description 2
- 239000011440 grout Substances 0.000 description 5
- 238000003825 pressing Methods 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 206010017076 Fracture Diseases 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 208000010392 Bone Fractures Diseases 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000011268 mixed slurry Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000010412 perfusion Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000012258 stirred mixture Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/06—Placing concrete under water
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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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B7/00—Barrages or weirs; Layout, construction, methods of, or devices for, making same
- E02B7/02—Fixed barrages
- E02B7/04—Dams across valleys
- E02B7/06—Earth-fill dams; Rock-fill dams
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Environmental & Geological Engineering (AREA)
- Ocean & Marine Engineering (AREA)
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Abstract
An underwater repairing method for a water seepage crack of a concrete panel belongs to the technical field of hydraulic engineering, and particularly relates to an underwater repairing method for a water seepage crack of a concrete panel. The method comprises the processes of underwater filling of silting materials, underwater caulking and leveling, filling of water into the plugging materials, construction of an anti-seepage cover sheet, surface sealing of the composite geomembrane and the like. The method is not limited by the operating conditions of the power station, does not need flow guiding and water abandoning construction, does not influence the normal operation of the power station, and saves water resources. The preparation work in earlier stage of underwater operation is less, and the construction progress can be improved to the maximum extent. The underwater direct operation does not need to set a large cofferdam to create dry land construction conditions, and the construction cost is greatly reduced. The underwater construction technology is mature, the construction equipment is reliable, and the underwater construction equipment is advanced, safe, reliable and high in efficiency.
Description
Technical Field
The invention belongs to the technical field of hydraulic engineering, and particularly relates to an underwater repairing method for a concrete panel water seepage crack.
Background
The concrete face rockfill dam is widely adopted due to the advantages of good stability, safety, economy, convenient construction diversion and flood control, adaptability to various terrain and geological conditions, available local filling materials, divisional use of various rock excavating materials, fast progress and the like. The stone body is a main stress structure to bear the pressure of the reservoir, and a reinforced concrete panel poured from bottom to top on the upstream surface of the stone body is used as an anti-seepage structure. Although factors such as dam settlement and deformation are considered in the construction process, the requirement of settlement cannot be met by the concrete panel block pouring. After the operation time is long, the problems of cracks, breakage and the like of partial panels also occur. These problems lead to leakage, and the seepage flow takes away small particles in the rockfill, so that a gradually enlarged seepage passage is formed, and the stability of the whole dam is finally affected. Therefore, it is necessary to repair the crack and breakage problem of the concrete panel to prevent leakage.
Disclosure of Invention
The invention provides an environment-friendly and reliable underwater repairing method for a water seepage crack of a concrete panel, and solves the problems that the existing concrete panel is difficult to repair due to water seepage, poor in plugging water stopping performance and the like.
The invention relates to an underwater repairing method for a water seepage crack of a concrete panel, which comprises the following steps:
s1, underwater filling of a silting material: pouring medium coarse sand and then pouring a mixture of fine powder sand and fly ash into a crack of a damaged area on the concrete panel for pouring silting;
s2, embedding grouting pipes in the cracks and the peripheries of the cracks;
s3, pouring plugging materials: respectively pouring according to the sizes of the cracks, wherein the type I cracks are poured by adopting cement fly ash, and the type II cracks are poured by adopting PTN material;
and S4, covering an anti-seepage cover sheet on the filled damaged area, covering the composite geomembrane, brushing the quick sealant on the periphery of the cover sheet and the geomembrane, and pressurizing and fixing.
The silt blocking material is prepared by pouring the silt blocking material into cracks with serious leakage in a damaged area on a concrete panel through a pouring hopper arranged on the water surface and a pouring guide pipe communicated with the pouring hopper.
The grouting pipes are divided into two types, one type is arranged along the crack, and the other type is arranged according to the elevation level.
The plugging material is poured through a pouring funnel, a grouting guide pipe and a grouting pipe, automatically flows to reach the concrete panel leakage area to be poured, and needs to be respectively poured according to the size of a crack, and the method specifically comprises the following steps:
the type I cracks are poured by adopting cement fly ash, and on the same elevation, the first-order holes are poured firstly, then the second-order holes are poured, and then different elevations are poured in sequence;
and the II-type cracks are filled by adopting PTN materials and pressurizing the PTN materials by a grouting pump.
The anti-seepage cover plate is an SR anti-seepage cover plate, and the quick sealant is a SXM-2 surface quick sealing material A component and a B component according to the weight ratio of 1: 0.3-0.35, and mixing the mixture uniformly.
The anti-seepage cover plate and the composite geomembrane are fixed by pressure through paving stainless steel pressing strips on the periphery of the cover plate and the geomembrane and fixing the stainless steel pressing strips by expansion bolts.
The method is not limited by the operating conditions of the power station, does not need flow guiding and water abandoning construction, does not influence the normal operation of the power station, and saves water resources. The preparation work in earlier stage of underwater operation is less, and the construction progress can be improved to the maximum extent. The underwater direct operation does not need to set a large cofferdam to create dry land construction conditions, and the construction cost is greatly reduced. The underwater construction technology is mature, the construction equipment is reliable, and the underwater construction equipment is advanced, safe, reliable and high in efficiency.
Drawings
Fig. 1 is a schematic view of the self-grouting of the present invention.
Fig. 2 is a diagram of a grout hole arrangement of the present invention.
FIG. 3 is a layout view of an impermeable coversheet of the present invention.
Fig. 4 is a layout of the composite geomembrane of the present invention.
FIG. 5 is an anchoring view of the barrier flap of the present invention.
Fig. 6 is a diagram of the composite geomembrane anchoring of the present invention.
FIG. 7 is a graph of the type I fracture treatment of the present invention.
FIG. 8 is a graph of the type II crack treatment of the present invention.
In the figure, 1-pouring funnel, 2-grouting guide pipe, 3-grouting pipe, 4-first-order hole, 5-second-order hole, 6-PTN grouting hole, 7-SR anti-seepage cover sheet, 8-expansion bolt, 9-stainless steel batten, 10-composite geomembrane, 11-quick sealant, 12-PTN gap filling, 13-concrete panel, 14-cushion area, 15-vertical seam, 16-crack, 17-crushing area, 18-type I crack and 19-type II crack.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Example 1: a concrete face rockfill dam is formed by pouring a concrete face 13 on a dam bedding region 14, a vertical seam 15 is formed between the two face plates, and a damaged region including a crack 16 and a crushing region 17 is formed on the concrete face 13 after long-term use. The invention provides an underwater repairing method for a water seepage crack of a concrete panel, which comprises the following steps:
s1, underwater inspection and cleaning: and cleaning the surface of the panel in the damaged area, and checking the conditions of cracks and water stop structures of the panel in the damaged area.
S2, underwater filling of a silting material: the prepared silting material is poured into cracks with serious leakage in the damaged area on the concrete panel 13 through a pouring funnel 1 arranged on the water surface and a grouting guide pipe 2 communicated with the pouring funnel;
the underwater pouring of the silt and the plugging material adopts a pouring method of 'firstly coarse and then fine', wherein the coarse material is medium coarse sand, and the fine material is a mixture of fine sand and fly ash which are uniformly mixed according to the weight ratio of 1: 1;
the grouting guide pipe 2 adopts a phi 150 plastic pipe, and the vertical distance between the discharge hole of the guide pipe and the surface of the concrete panel 13 is not more than 10 cm.
S3, underwater caulking and leveling: after the underwater perfusion clogging is finished, drilling holes at staggered platform cracks and damaged panels around the cracks and embedding grouting pipes 3, wherein the cracks are filled with an underwater rapid sealant 11 around the pipes to seal the cracks, so that the cracks are flush with the surfaces of the panels in the non-peeling areas;
the quick sealant 11 is prepared from a component A and a component B of an SXM-2 surface quick sealing material according to a weight ratio of 1: 0.3-0.35 preparing a uniformly stirred mixture;
the embedded grouting pipe 3 is embedded by a diver drilling by adopting underwater hydraulic drilling;
the grout pipe 3 adopts two forms, DN20 seamless steel pipe and DN10 seamless steel pipe, wherein:
DN20 seamless steel tube is arranged according to 1.5m of horizontal distance, 1.5m of height difference interval, the grouting tube stretches into 50cm of lower part of the panel, the same row is divided into two-order holes of cement fly ash grouting, namely a first-order hole 4 and a second-order hole 5, and the rows are not divided into orders;
DN10 seamless steel tube is arranged along the crack 16 with height difference interval of 0.8m, and the grouting tube extends into the lower part of the panel by 10 cm.
S4, pouring the plugging materials, and pouring according to the sizes of the cracks, specifically:
the type I cracks 18 are filled with cement fly ash, the cement fly ash mixed slurry is communicated with a grouting pipe 3 through a filling funnel 1 and a grouting guide pipe 2, and the slurry flows automatically from the filling funnel 1 through the grouting guide pipe 2 and the grouting pipe 3 and finally reaches a leakage area of the concrete panel 13, so that the plugging and seepage-proofing effects are achieved;
the type I cracks are poured from the cement fly ash grouting first-order holes 4 and the second-order holes 5, the first-order holes 4 are poured at the same elevation, then the second-order holes 5 are poured, and then different elevations are poured in sequence;
the class ii fractures 19 are infused with PTN material from the PTN grout holes 6. The novel PTN joint material is a mixture of a two-component material A and a two-component material B which are mixed according to the mass ratio of 1: 2. After being uniformly stirred, the mixture is pressurized and poured into cracks by a grouting pump to form PTN joint filling 12 which is firmly adhered with the side walls and the bottoms of the cracks into a whole to play the functions of sealing, water proofing, seepage prevention, frost heaving resistance, foreign matter embedding prevention and deformation adaptation;
the grouting pressure is controlled to be not more than 0.05MPa at the outlet of the grouting pump;
after the pouring is finished, cutting off the grouting pipe 3, and sealing a grouting hole formed after cutting off;
wherein, when the width delta of the crack is less than or equal to 0.5mm, the crack is a type I crack; when the width of the crack is larger than delta and larger than 0.5mm, the crack is a type II crack;
in the grouting process, if the groutability is better, the grouting is carried out until the grouting pipe discharges the grout; and if a grouting pump is adopted for grouting, finishing when the grout suction amount is less than 10L/min.
S5, constructing the underwater anti-seepage cover plate: polishing and cleaning the repaired damaged area, uniformly and flatly brushing the adhesive on the surface of the damaged area, pasting an SR anti-seepage cover sheet 7, uniformly pressing to tightly paste the cover sheet and a panel base plane, paving stainless steel battens 9 on the periphery of the cover sheet, fixing the SR anti-seepage cover sheet 7 and the stainless steel battens 9 by expansion bolts 8 at an interval of 80cm, and finally brushing an underwater quick sealant 11 on the periphery of the cover sheet for edge sealing;
wherein, the adhesive adopts HK elastic edge sealing agent;
the cover plate is an SR anti-seepage cover plate 7 with the width of 1m, when the damaged area of the panel exceeds 1m, the panel is formed by overlapping a plurality of SR anti-seepage cover plates 7, the overlapping width between the two cover plates is 5cm, and the overlapping end is sealed by adopting an underwater rapid sealant 11;
the stainless steel pressing strip 9 is 4cm wide and 3mm thick;
the expansion bolt 8 employs M8.
S6, sealing the surface of the composite geomembrane: the SR anti-seepage cover sheet 7 is integrally covered with a composite geomembrane 10 for sealing, the periphery of the SR anti-seepage cover sheet is coated with an underwater rapid sealant 11 for sealing, and stainless steel battens 9 are arranged around the composite geomembrane 10 and fixed by expansion bolts 8 to play a role in anti-seepage sealing. The specification and arrangement of the compression strips and the expansion bolts are the same as S5.
The technical solution of the present invention is not limited to the above-mentioned specific embodiments, and all modifications and variations made according to the technical solution of the present invention are included in the scope of the present invention.
Claims (6)
1. The underwater repairing method for the water seepage crack of the concrete panel is characterized by comprising the following steps:
s1, underwater filling of a silting material: pouring medium coarse sand and then pouring a mixture of fine powder sand and fly ash into a crack of a damaged area on the concrete panel for pouring silting;
s2, embedding grouting pipes in the cracks and the peripheries of the cracks; the method comprises the following steps:
grouting pipes embedded at the periphery of the crack are DN20 seamless steel pipes and are arranged at a horizontal interval of 1.5m and a height difference interval of 1.5m, the grouting pipes extend into the lower part of the panel by 50cm, the grouting pipes are divided into two-sequence holes for cement fly ash grouting in the same row, namely a first-sequence hole and a second-sequence hole, and the rows are not divided into sequences;
the crack outlet grouting pipe is a DN10 seamless steel pipe and is arranged along the crack height difference at intervals of 0.8m, and the grouting pipe extends into the lower part of the panel by 10 cm;
s3, pouring plugging materials: respectively pouring according to the sizes of the cracks, wherein the type I cracks are poured by adopting cement fly ash, and the type II cracks are poured by adopting PTN material; wherein:
pouring cement fly ash into the class I cracks, and pouring the cement fly ash from the first-order hole and the second-order hole; firstly, filling the first-order holes, then filling the second-order holes and then sequentially filling different elevations on the same elevation;
the II-type cracks are poured from grouting pipes arranged at the cracks by adopting a PTN material;
and S4, covering an anti-seepage cover sheet on the filled damaged area, covering the composite geomembrane, brushing the quick sealant on the periphery of the cover sheet and the geomembrane, and pressurizing and fixing.
2. The method for underwater repairing a water seepage crack in a concrete panel as claimed in claim 1, wherein the silting material is prepared by pouring the prepared silting material into the crack where the leakage of the damaged area is severe on the concrete panel through a pouring hopper arranged on the water surface and a pouring conduit communicated with the pouring hopper.
3. The method for underwater repairing a concrete panel permeable fracture according to claim 1, wherein said grouting pipes are divided into two types, one type being arranged along the fracture and the other type being arranged at an elevated level.
4. The underwater repairing method for the water seepage crack of the concrete panel as claimed in claim 1, wherein the plugging material is poured to automatically flow to the concrete panel seepage area through a pouring funnel, a grouting conduit and a grouting pipe, and is poured according to the size of the crack, specifically:
the type I cracks are poured by adopting cement fly ash, and on the same elevation, the first-order holes are poured firstly, then the second-order holes are poured, and then different elevations are poured in sequence;
and the II-type cracks are filled by adopting PTN materials and pressurizing the PTN materials by a grouting pump.
5. The underwater repairing method for the water seepage crack of the concrete panel as claimed in claim 1, wherein the anti-seepage covering sheet is an SR anti-seepage covering sheet, and the quick sealant is an SXM-2 surface quick sealing material A component and a B component which are mixed according to a weight ratio of 1: 0.3-0.35, and mixing the mixture uniformly.
6. The underwater repairing method for the water seepage crack of the concrete panel as claimed in claim 1, wherein the pressure fixing of the impermeable cover sheet and the composite geomembrane is realized by laying stainless steel battens around the cover sheet and the geomembrane and fixing the stainless steel battens by expansion bolts.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911075073.6A CN110984160B (en) | 2019-11-06 | 2019-11-06 | Underwater repair method for water seepage crack of concrete panel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911075073.6A CN110984160B (en) | 2019-11-06 | 2019-11-06 | Underwater repair method for water seepage crack of concrete panel |
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| CN110984160A CN110984160A (en) | 2020-04-10 |
| CN110984160B true CN110984160B (en) | 2022-01-07 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111535253A (en) * | 2020-06-05 | 2020-08-14 | 长江勘测规划设计研究有限责任公司 | Underwater rapid repair construction method and repair structure for seepage crack of concrete faced rockfill dam |
| CN111910697A (en) * | 2020-07-14 | 2020-11-10 | 四川轻化工大学 | Device and method for quickly repairing geomembrane |
| CN113106976A (en) * | 2021-05-11 | 2021-07-13 | 中科鼎实环境工程有限公司 | Movable sealant filling device and method for flexible vertical impervious wall |
| CN116024979B (en) * | 2023-03-31 | 2023-06-27 | 水利部交通运输部国家能源局南京水利科学研究院 | Panel dam leakage repairing equipment and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107012832A (en) * | 2017-04-06 | 2017-08-04 | 长江勘测规划设计研究有限责任公司 | Plugging structure and method under a kind of CFRD percolating water |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107012832A (en) * | 2017-04-06 | 2017-08-04 | 长江勘测规划设计研究有限责任公司 | Plugging structure and method under a kind of CFRD percolating water |
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