CN110593200B - Anti-seepage structure for construction joint of rock-fill concrete dam and construction method thereof - Google Patents
Anti-seepage structure for construction joint of rock-fill concrete dam and construction method thereof Download PDFInfo
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- CN110593200B CN110593200B CN201910749742.7A CN201910749742A CN110593200B CN 110593200 B CN110593200 B CN 110593200B CN 201910749742 A CN201910749742 A CN 201910749742A CN 110593200 B CN110593200 B CN 110593200B
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- 239000004567 concrete Substances 0.000 title claims abstract description 114
- 238000010276 construction Methods 0.000 title claims abstract description 112
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 74
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 15
- 238000007788 roughening Methods 0.000 claims description 4
- 238000005056 compaction Methods 0.000 claims description 3
- 238000004080 punching Methods 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 10
- 229910052742 iron Inorganic materials 0.000 abstract description 5
- 230000002265 prevention Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 3
- 238000004134 energy conservation Methods 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 3
- 239000010410 layer Substances 0.000 description 72
- 239000011435 rock Substances 0.000 description 6
- 239000011376 self-consolidating concrete Substances 0.000 description 6
- 239000011229 interlayer Substances 0.000 description 5
- 238000011282 treatment Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
- 238000003908 quality control method Methods 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 229920002396 Polyurea Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011284 combination treatment Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
Classifications
-
- 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
Abstract
The invention provides an impermeable structure for a construction joint of a rock-fill concrete dam, which comprises lower rock-fill concrete and a lower impermeable area arranged on one side of the lower rock-fill concrete. According to the invention, the water stop belt is arranged in the middle of the upstream seepage prevention area of each layer of construction joint surface of the rock-fill concrete dam, and is embedded in the lower layer of concrete and the upper layer of concrete, so that water seepage between the layers of construction joint surfaces of the rock-fill concrete dam can be effectively prevented, the influence on the durability and engineering appearance quality of dam concrete due to water seepage between the layers is avoided, a foundation is laid for building a water-tight dam, the phenomenon of water seepage between the layers on the downstream surface of the dam after water is stored in the reservoir is avoided, and the problem of water seepage of the construction joint surface is solved; on the premise of achieving the same effect, the invention has the advantages of simple structure, simple construction process, high construction speed, no need of special materials, low cost of galvanized iron sheet, light weight, energy conservation and environmental protection, and saves engineering investment compared with the traditional process.
Description
Technical Field
The invention relates to an impermeable structure for a construction joint of a rock-fill concrete dam and a construction method thereof, and belongs to the technical field of rock-fill concrete dams.
Background
The rock-fill concrete is a novel concrete proposed by Qinghua university, and is a novel large-volume concrete construction mode developed on the basis of self-compacting concrete technology. The method comprises the steps of firstly directly putting large-grain-size rock piles into a bin to form rock piles with gaps, then pouring specially developed low-hydration-heat low-cost self-compacting concrete from the upper part of the rock piles, and filling the self-compacting concrete into the gaps of the rock piles by utilizing the high-flow segregation-resistant performance of the self-compacting concrete by virtue of self weight to form complete, compact, high-strength, low-hydration-heat and low-shrinkage-deformation mass concrete.
The rock-fill concrete adopts a construction mode of rock block layered stacking and self-compacting concrete layered filling, and the layered height is generally controlled to be 1.5-2 m, so that a horizontal construction joint exists. The quality of the joint surface combination treatment of the construction is related to the seepage prevention, stability, durability and the like of the dam after the reservoir is filled, and is the key point of the dam construction quality control.
In construction practice, rock-fill concrete layering rock-fill can't avoid rock block collision to smash stone dust and rubble to fall on horizontal construction joint face in the rock-fill process, smash stone dust and rubble to lie in the rock-fill bottom, can not clear up, causes the concrete placement back construction joint face to combine poorly. In addition, in the concrete pouring process, the concrete is forced to stop pouring due to other reasons, the treatment of the bin surface can only be carried out on the roughening or the scouring treatment of the concrete in the seepage-proofing areas on the upstream side and the downstream side, and the middle rockfill concrete area cannot be treated, so that the possibility of interlayer water seepage of the concrete construction joints is increased, and the phenomenon of interlayer water seepage on the downstream side of the dam after water storage of the reservoir sometimes occurs. The interlayer water seepage phenomenon after the dam is built is difficult to treat, so that the dam is difficult to treat at high cost, the ideal effect is difficult to achieve, and meanwhile, the durability of the concrete is reduced due to the interlayer water seepage, and the engineering appearance quality is seriously influenced. The traditional interlayer water seepage of the rockfill concrete dam treatment adopts a method of arranging an impermeable layer on the upstream and downstream surfaces of the dam body, wherein the impermeable layer is a polyurea elastomer impermeable layer obtained by adopting a spin-spray film construction method or other construction methods, however, the impermeable layer construction process is complex, the comprehensive cost is high, and the field quality control requirement is high, so that the impermeable layer is difficult to adopt in engineering construction.
Disclosure of Invention
In order to solve the technical problems, the invention provides the anti-seepage structure of the construction joint of the rock-fill concrete dam and the construction method thereof, and the anti-seepage structure of the construction joint of the rock-fill concrete dam and the construction method thereof have the advantages of simple structure, simple construction process, high construction speed, no need of special materials, low cost of galvanized iron sheet, light weight, energy conservation and environmental protection, and saving of engineering investment compared with the traditional process.
The invention is realized by the following technical scheme.
The invention provides an impermeable structure for a construction joint of a rock-fill concrete dam, which comprises lower rock-fill concrete and a lower impermeable area arranged on one side of the lower rock-fill concrete; the method is characterized in that: the upper end face of the lower-layer rock-fill concrete is provided with an upper-layer rock-fill concrete, one side of the upper-layer rock-fill concrete is provided with an upper-layer seepage-proofing area, and the positions of the upper-layer seepage-proofing area and the lower-layer seepage-proofing area correspond to each other; the same construction joint surface exists between the lower layer rock-fill concrete and the upper layer rock-fill concrete and between the lower layer seepage-proofing area and the upper layer seepage-proofing area; and a water stop belt is arranged on the vertical construction joint surface, one end of the water stop belt is arranged in the upper impermeable zone, and the other end of the water stop belt is arranged in the lower impermeable zone.
The water stop belt is horizontally arranged on the whole dam surface along the axial direction of the dam.
The lower impermeable zone is positioned on the upstream surface of the lower rockfill concrete, and the upper impermeable zone is positioned on the upstream surface of the upper rockfill concrete.
One end of the water stop belt is positioned in the middle of the lower impermeable zone, and the other end of the water stop belt is positioned in the middle of the upper impermeable zone.
The construction joint surface is provided with a plurality of layers, and the water stop belt is arranged on each layer of construction joint surface below the normal water storage level of the rock-fill concrete dam.
The construction method based on the seepage-proofing structure of the construction joint of the continuous rock-fill concrete dam comprises the following steps:
(1) constructing lower-layer rock-fill concrete, constructing a lower-layer seepage-proofing area on one side of the lower-layer rock-fill concrete, and forming a construction joint surface at the tops of the lower-layer rock-fill concrete and the lower-layer seepage-proofing area after construction is completed;
(2) after the self-compaction concrete pouring of the lower anti-seepage area is finished, before the initial setting of the concrete, horizontally arranging a water stop belt at the middle position in the lower anti-seepage area at the upstream of the construction joint surface along the axial direction of the dam, wherein one end of the water stop belt is embedded into the lower anti-seepage area at the upstream surface, and the other end of the water stop belt is exposed;
(3) manually finishing and trowelling concrete in the seepage-proofing area of the lower layer, and punching or roughening the construction joint surface;
(4) on the construction joint surface, constructing upper-layer rock-fill concrete corresponding to the position of the lower-layer rock-fill concrete and constructing an upper-layer seepage-proofing area corresponding to the position of the lower-layer seepage-proofing area;
(5) after the construction of the upper rock-fill concrete and the upper impermeable zone is completed, the exposed section of the water stop belt is embedded into the upper impermeable zone of the upstream surface.
In the step (2), the water stop is arranged on the whole dam face and is mutually perpendicular to the construction joint face.
The construction joint surface is provided with a plurality of layers, and the water stop belt is arranged on each layer of construction joint surface below the normal water storage level of the rock-fill concrete dam.
The invention has the beneficial effects that: arranging a water stop belt in the middle of an upstream seepage prevention area of each layer of construction joint surface of the rock-fill concrete dam, wherein the water stop belt is embedded in lower layer concrete and upper layer concrete, so that water seepage between the layers of construction joint surfaces of the rock-fill concrete dam can be effectively prevented, the influence on the durability and engineering appearance quality of dam concrete due to water seepage between the layers is avoided, a foundation is laid for building a water-tight dam, the phenomenon of water seepage between the layers on the downstream surface of the dam after water is stored in a reservoir is avoided, and the problem of water seepage of the construction joint surfaces is solved; on the premise of achieving the same effect, the invention has the advantages of simple structure, simple construction process, high construction speed, no need of special materials, low cost of galvanized iron sheet, light weight, energy conservation and environmental protection, and saves engineering investment compared with the traditional process.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
in the figure: 1-lower layer rock-fill concrete, 2-upper layer rock-fill concrete, 3-lower layer seepage-proofing area, 4-upper layer seepage-proofing area, 5-construction joint surface and 6-water stop.
Detailed Description
The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the above.
As shown in fig. 1, the impermeable structure for the construction joint of the rockfill concrete dam comprises lower rockfill concrete 1 and a lower impermeable zone 3 arranged on one side of the lower rockfill concrete 1; the method is characterized in that: the upper end face of the lower-layer rock-fill concrete 1 is provided with an upper-layer rock-fill concrete 2, one side of the upper-layer rock-fill concrete 2 is provided with an upper-layer impermeable zone 4, and the upper-layer impermeable zone 4 corresponds to the lower-layer impermeable zone 3 in position; the same construction joint surface 5 exists between the lower layer rock-fill concrete 1 and the upper layer rock-fill concrete 2, and between the lower layer seepage-proofing area 3 and the upper layer seepage-proofing area 4; and a water stop belt 6 is arranged on the vertical construction joint surface 5, one end of the water stop belt 6 is arranged in the upper impermeable zone 4, and the other end is arranged in the lower impermeable zone 3.
The water stop belt 6 is horizontally arranged on the whole dam surface along the axial direction of the dam.
The lower impermeable zone 3 is positioned on the upstream surface of the lower rockfill concrete 1, and the upper impermeable zone 4 is positioned on the upstream surface of the upper rockfill concrete 2.
One end of the water stop 6 is positioned in the middle of the lower impermeable zone 3, and the other end is positioned in the middle of the upper impermeable zone 4.
The construction joint surface 5 is provided with a plurality of layers, and the water stop belt 6 is arranged on each layer of construction joint surface 5 below the normal water storage level of the rockfill concrete dam.
The construction method based on the seepage-proofing structure of the construction joint of the continuous rock-fill concrete dam comprises the following steps:
(1) constructing a lower-layer rock-fill concrete 1, constructing a lower-layer seepage-proofing area 3 on one side of the lower-layer rock-fill concrete 1, and forming a construction joint surface 5 at the tops of the lower-layer rock-fill concrete 1 and the lower-layer seepage-proofing area 3 after construction is completed;
(2) after the self-compaction concrete pouring of the lower anti-seepage area 3 is finished, before the initial setting of the concrete, horizontally arranging a water stop belt 6 along the axial direction of the dam at the middle position inside the lower anti-seepage area 3 at the upstream of the construction joint surface 5, wherein one end of the water stop belt 6 is embedded into the lower anti-seepage area 3 at the upstream surface, and the other end is exposed;
(3) manually finishing and trowelling the concrete of the lower impermeable zone 3, and punching or roughening the construction joint surface 5;
(4) on the construction joint surface 5, the upper layer rock-fill concrete 2 is constructed corresponding to the position of the lower layer rock-fill concrete 1, and the upper layer seepage-proofing area 4 is constructed corresponding to the position of the lower layer seepage-proofing area 3;
(5) after the construction of the upper layer rock-fill concrete 2 and the upper layer seepage-proofing area 4 is completed, the exposed section of the water stop 6 is embedded into the upper layer seepage-proofing area 4 on the upstream surface.
In the step (2), the water stop 6 is arranged on the whole dam surface and is mutually perpendicular to the construction joint surface 5.
The construction joint surface 5 is provided with a plurality of layers, and the water stop belt 6 is arranged on each layer of construction joint surface 5 below the normal water storage level of the rockfill concrete dam.
Preferably, the water stop 6 is disconnected when meeting the dam body structural joint and is respectively arranged in the lower impermeable zone 3 and the upper impermeable zone 4.
Preferably, the water stop 6 is made of galvanized iron sheet with the thickness of 0.5mm, the width of 40cm, and is embedded into the lower impermeable zone 3 for 20cm and the upper impermeable zone 4 for 20cm.
Examples
As described above, in the construction joint seepage-proofing structure of the rockfill concrete dam, the lower rockfill concrete 1 and the lower seepage-proofing area 3 on the upstream thereof are firstly constructed, the construction joint surface 5 is formed after construction is completed, the water stop belt 6 is horizontally arranged along the axial direction of the dam at the middle position inside the lower seepage-proofing area on the upstream of the construction joint surface 5 before initial setting of concrete after the self-compacting concrete pouring of the lower seepage-proofing area 3 is completed, and the water stop belt 6 is arranged on the whole dam surface and is perpendicular to the construction joint surface 5 and is disconnected when meeting the structural joint of the dam body.
Further, the water stop 6 is made of galvanized iron sheet with the thickness of 0.5mm, the width is 40cm, the water stop is embedded into the lower impermeable zone 3 for 20cm, and the water stop leaks out of the surface of the construction joint surface 5 for 20cm.
Secondly, after the water stop 6 is installed, the lower seepage-proofing area 3 of the upstream surface is smoothed by manually finishing the surface, and the construction joint surface 5 is punched or roughened according to a conventional construction joint surface treatment method.
Finally, after the construction of the upper-layer rockfill concrete 2 and the upper-layer seepage-proofing area 4 on the upper side of the upper-layer rockfill concrete 2 is completed, the water stop belt 6 is embedded into the upper-layer seepage-proofing area 4 of the upper-layer rockfill concrete 2 by 20cm, and finally, the seepage-proofing and water stop structure of the construction joint surface is formed.
Furthermore, the seepage prevention structure is arranged on each layer of construction joint surface 5 below the normal water storage level of the rock-fill concrete dam, namely, the seepage prevention structure can be arranged in a plurality of layers below the normal water storage level of the rock-fill concrete dam, and can effectively prevent water seepage between the construction joint surfaces of the rock-fill concrete dam.
Claims (6)
1. The construction method of the anti-seepage structure of the construction joint of the rockfill concrete dam comprises lower-layer rockfill concrete (1) and a lower-layer anti-seepage area (3) arranged on one side of the lower-layer rockfill concrete (1); the method is characterized in that: the upper end face of the lower-layer rock-fill concrete (1) is provided with an upper-layer rock-fill concrete (2), one side of the upper-layer rock-fill concrete (2) is provided with an upper-layer seepage-proofing area (4), and the positions of the upper-layer seepage-proofing area (4) and the lower-layer seepage-proofing area (3) correspond; the same construction joint surface (5) exists between the lower-layer rock-fill concrete (1) and the upper-layer rock-fill concrete (2) and between the lower-layer seepage-proofing area (3) and the upper-layer seepage-proofing area (4); a water stop belt (6) is arranged on the vertical construction joint surface (5), one end of the water stop belt (6) is arranged in the upper impermeable zone (4), and the other end is arranged in the lower impermeable zone (3);
the construction method comprises the following steps:
(1) constructing a lower-layer rock-fill concrete (1), constructing a lower-layer seepage-proofing area (3) on one side of the lower-layer rock-fill concrete (1), and forming a construction joint surface (5) at the tops of the lower-layer rock-fill concrete (1) and the lower-layer seepage-proofing area (3) after construction is completed;
(2) after the self-compaction concrete pouring of the lower anti-seepage area (3) is finished, before the initial setting of the concrete, a water stop belt (6) is horizontally arranged at the middle position inside the lower anti-seepage area (3) at the upstream of the construction joint surface (5) along the axial direction of the dam, one end of the water stop belt (6) is embedded into the lower anti-seepage area (3) at the upstream surface, and the other end of the water stop belt is exposed;
(3) manually finishing and trowelling the concrete of the lower impermeable zone (3), and punching or roughening the construction joint surface (5);
(4) on the construction joint surface (5), constructing an upper-layer rock-fill concrete (2) corresponding to the position of the lower-layer rock-fill concrete (1) and constructing an upper-layer seepage-proofing area (4) corresponding to the position of the lower-layer seepage-proofing area (3);
(5) after the construction of the upper rock-fill concrete (2) and the upper impermeable zone (4) is completed, the exposed section of the water stop belt (6) is embedded into the upper impermeable zone (4) on the upstream surface;
in the step (2), the water stop belt (6) is arranged on the whole dam surface and is mutually perpendicular to the construction joint surface (5).
2. The construction method of the rockfill concrete dam construction joint seepage-proofing structure according to claim 1, wherein the construction method comprises the following steps: the water stop belt (6) is horizontally arranged on the whole dam surface along the axial direction of the dam.
3. The construction method of the rockfill concrete dam construction joint seepage-proofing structure according to claim 1, wherein the construction method comprises the following steps: the lower impermeable area (3) is positioned on the upstream surface of the lower rockfill concrete (1), and the upper impermeable area (4) is positioned on the upstream surface of the upper rockfill concrete (2).
4. The construction method of the rockfill concrete dam construction joint seepage-proofing structure according to claim 1, wherein the construction method comprises the following steps: one end of the water stop belt (6) is positioned in the middle of the lower impermeable zone (3), and the other end of the water stop belt is positioned in the middle of the upper impermeable zone (4).
5. The construction method of the rockfill concrete dam construction joint seepage-proofing structure according to claim 1, wherein the construction method comprises the following steps: the construction joint surface (5) is provided with a plurality of layers, and the water stop belt (6) is arranged on each layer of construction joint surface (5) below the normal water storage level of the rock-fill concrete dam.
6. The construction method of the rockfill concrete dam construction joint seepage-proofing structure according to claim 1, wherein the construction method comprises the following steps: the construction joint surface (5) is provided with a plurality of layers, and the water stop belt (6) is arranged on each layer of construction joint surface (5) below the normal water storage level of the rock-fill concrete dam.
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| CN201910749742.7A CN110593200B (en) | 2019-08-14 | 2019-08-14 | Anti-seepage structure for construction joint of rock-fill concrete dam and construction method thereof |
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| CN112962536B (en) * | 2021-02-09 | 2022-08-30 | 中国水电基础局有限公司 | Seepage-proofing structure for construction joint of rockfill concrete dam and construction method thereof |
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| CN210827336U (en) * | 2019-08-14 | 2020-06-23 | 中国电建集团贵阳勘测设计研究院有限公司 | Rockfill concrete dam construction joint seepage prevention structure |
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2019
- 2019-08-14 CN CN201910749742.7A patent/CN110593200B/en active Active
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| WO2006026888A1 (en) * | 2004-07-29 | 2006-03-16 | Lichen Yang | An incline bed and horizontal push method for constructing a dam with rolled concrete |
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