CN110593200A - Seepage-proofing structure for construction joint of rockfill concrete dam and construction method thereof - Google Patents
Seepage-proofing structure for construction joint of rockfill concrete dam and construction method thereof Download PDFInfo
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- CN110593200A CN110593200A CN201910749742.7A CN201910749742A CN110593200A CN 110593200 A CN110593200 A CN 110593200A CN 201910749742 A CN201910749742 A CN 201910749742A CN 110593200 A CN110593200 A CN 110593200A
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- 239000004567 concrete Substances 0.000 title claims abstract description 113
- 238000010276 construction Methods 0.000 title claims abstract description 97
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 70
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 15
- 239000011376 self-consolidating concrete Substances 0.000 claims description 9
- 238000003860 storage Methods 0.000 claims description 9
- 230000002265 prevention Effects 0.000 claims description 5
- 230000001680 brushing effect Effects 0.000 claims description 2
- 239000010410 layer Substances 0.000 abstract description 52
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 8
- 239000011229 interlayer Substances 0.000 abstract description 8
- 229910052742 iron Inorganic materials 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract description 2
- 239000004575 stone Substances 0.000 description 4
- 238000009499 grossing Methods 0.000 description 3
- 238000011282 treatment Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 2
- 238000003908 quality control method Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 238000007788 roughening Methods 0.000 description 2
- 238000004381 surface treatment Methods 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
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000002344 surface layer Substances 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
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
- Building Environments (AREA)
Abstract
The invention provides a construction joint seepage-proofing structure of a rockfill concrete dam, which comprises lower rockfill concrete and a lower seepage-proofing area arranged on one side of the lower rockfill concrete. According to the invention, the water stop belt is arranged in the middle of the upstream seepage-proofing area of each layer of construction joint surface of the rockfill concrete dam, and is embedded in the lower layer concrete and the upper layer concrete, so that the interlayer seepage of the construction joint surface of the rockfill concrete dam can be effectively prevented, the influence on the durability and the engineering appearance quality of dam concrete due to the interlayer seepage is avoided, a foundation is laid for constructing a water-tight dam, the phenomenon of interlayer seepage on the downstream surface of the dam after water is stored in a reservoir is avoided, and the problem of the 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 the galvanized iron sheet, light weight, energy conservation and environmental protection, and saves the engineering investment compared with the traditional process.
Description
Technical Field
The invention relates to a construction joint seepage-proofing structure of a rockfill concrete dam and a construction method thereof, belonging to the technical field of rockfill concrete dams.
Background
The rock-fill concrete is a novel concrete provided by Qinghua university, and is a novel large-volume concrete construction mode developed on the basis of a self-compacting concrete technology. The method comprises the steps of firstly directly putting the rockfill with large particle size into a warehouse to form a rockfill body with a gap, then pouring specially-developed low-hydration-heat low-cost self-compacting concrete from the upper part of the rockfill body, and filling the self-compacting concrete into the gap of the rockfill by means of self-weight by utilizing the high-flow segregation resistance of the self-compacting concrete to form the complete and compact large-volume concrete with higher strength, low hydration-heat and low shrinkage deformation.
The rock-fill concrete adopts the construction mode of stacking the rock blocks in a layered mode and filling the self-compacting concrete in a layered mode, and the layered height is generally controlled to be 1.5-2 m, so that a horizontal construction joint exists. The quality of the construction joint surface combination treatment relates to seepage prevention, stability, durability and the like of the dam after reservoir water storage, and is the key point of dam construction quality control.
In construction practice, the layered rockfill concrete cannot avoid that stone powder and broken stone fall on a horizontal construction joint surface when the rock blocks collide and are smashed in the rockfill process, and the smashed stone powder and the broken stone are located at the bottom of the rockfill and cannot be cleaned, so that the construction joint surface after concrete pouring is not well combined. In addition, in the concrete pouring process, concrete is forced to stop pouring due to other reasons, the bin surface treatment can only be carried out on the concrete chiseling or scouring treatment of the upstream and downstream side seepage-proofing areas, the middle rockfill concrete area cannot be treated, the possibility of water seepage among the layers of the concrete construction joints is increased, and therefore the phenomenon of water seepage among the layers of the downstream surface of the dam after the reservoir stores water sometimes occurs. The interlayer water seepage phenomenon is difficult to treat after the dam is built, the ideal effect is difficult to achieve even the treatment is carried out at high cost, and meanwhile, the durability of concrete is reduced due to the interlayer water seepage, and the appearance quality of the project is also seriously affected. The water seepage between the treatment layers of the traditional rockfill concrete dam adopts a method of arranging impermeable layers on the upstream and downstream surfaces of a dam body, the impermeable layers are polyurea elastomer impermeable layers obtained by a rotary spraying membrane method or other construction methods, however, the construction process of the impermeable layers is complex, the comprehensive manufacturing cost is high, the on-site quality control requirement is high, and the impermeable layers are often difficult to adopt in engineering construction.
Disclosure of Invention
In order to solve the technical problems, the invention provides a construction joint seepage-proofing structure of a rockfill concrete dam and a construction method thereof.
The invention is realized by the following technical scheme.
The invention provides a construction joint seepage-proofing structure of a rockfill concrete dam, which comprises lower rockfill concrete and a lower seepage-proofing area arranged on one side of the lower rockfill concrete; the method is characterized in that: the upper end surface of the lower rock-fill concrete is provided with upper rock-fill concrete, one side of the upper rock-fill concrete is provided with an upper anti-seepage area, and the upper anti-seepage area corresponds to the lower anti-seepage area in position; the same construction joint surface exists between the lower rock-fill concrete and the upper rock-fill concrete and between the lower seepage-proofing area and the upper seepage-proofing area; and a water stop is arranged perpendicular to the construction joint surface, one end of the water stop is arranged in the upper-layer seepage-proofing area, and the other end of the water stop is arranged in the lower-layer seepage-proofing area.
And the water stop belt is horizontally arranged on the whole dam surface along the axis direction of the dam.
The lower seepage-proofing area is located on the upstream surface of the lower rock-fill concrete, and the upper seepage-proofing area is located on the upstream surface of the upper rock-fill concrete.
One end of the water stop is positioned in the middle of the lower anti-seepage area, and the other end of the water stop is positioned in the middle of the upper anti-seepage area.
The construction joint surface is provided with a plurality of layers, and the water stop belts are arranged on each layer of construction joint surface below the normal water storage level of the rockfill concrete dam.
The construction method of the seepage-proofing structure based on the construction joint of the straight rockfill concrete dam comprises the following steps:
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 on the top of the lower-layer rock-fill concrete and the top of the lower-layer seepage-proofing area after construction is finished;
after the self-compacting concrete is poured in the lower anti-seepage area and before the concrete is initially set, a water stop is horizontally arranged in the middle position inside the lower anti-seepage area at the upstream of the construction joint surface along the axis direction of the dam, one end of the water stop is embedded into the lower anti-seepage area at the upstream surface, and the other end of the water stop is exposed;
thirdly, manually finishing and smoothing the concrete in the lower anti-seepage area, and roughening or chiseling the construction joint surface;
fourthly, constructing upper-layer rock-fill concrete on the construction joint surface corresponding to the position of the lower-layer rock-fill concrete, and constructing an upper-layer anti-seepage area corresponding to the position of the lower-layer anti-seepage area;
fifthly, after the upper rock-fill concrete and the upper seepage-proofing area are constructed, the exposed section of the water stop is embedded into the upper seepage-proofing area on the upstream surface.
And in the second step, the water stop belt is arranged on the whole dam surface and is vertical to the construction joint surface.
The construction joint surface is provided with a plurality of layers, and the water stop belts are arranged on each layer of construction joint surface below the normal water storage level of the rockfill concrete dam.
The invention has the beneficial effects that: the water stop belt is arranged in the middle of the upstream seepage-proofing area of each layer of construction joint surface of the rockfill concrete dam, and is embedded in the lower-layer concrete and the upper-layer concrete, so that the interlayer seepage of the construction joint surface of the rockfill concrete dam can be effectively prevented, the influence on the durability and the engineering appearance quality of dam concrete due to the interlayer seepage is avoided, a foundation is laid for constructing a water-tight dam, the phenomenon of interlayer seepage on the downstream surface of the dam after water is stored in a reservoir is avoided, and the problem of the 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 the galvanized iron sheet, light weight, energy conservation and environmental protection, and saves the engineering investment compared with the traditional process.
Drawings
FIG. 1 is a schematic structural view of the present invention;
in the figure: 1-lower rock-fill concrete, 2-upper rock-fill concrete, 3-lower seepage-proofing zone, 4-upper seepage-proofing zone, 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 described.
As shown in fig. 1, an anti-seepage structure for a construction joint of a rockfill concrete dam comprises lower rockfill concrete 1 and a lower anti-seepage area 3 arranged on one side of the lower rockfill concrete 1; the method is characterized in that: the upper end surface of the lower rock-fill concrete 1 is provided with an upper rock-fill concrete 2, one side of the upper rock-fill concrete 2 is provided with an upper anti-seepage area 4, and the upper anti-seepage area 4 corresponds to the lower anti-seepage area 3; the same construction joint surface 5 is arranged between the lower-layer rock-fill concrete 1 and the upper-layer rock-fill concrete 2 and between the lower-layer impervious area 3 and the upper-layer impervious area 4; and a water stop belt 6 is arranged perpendicular to the construction joint surface 5, one end of the water stop belt 6 is arranged in the upper anti-seepage area 4, and the other end of the water stop belt 6 is arranged in the lower anti-seepage area 3.
And the water stop belt 6 is horizontally arranged on the whole dam surface along the axis direction of the dam.
The lower seepage-proofing area 3 is positioned on the upstream surface of the lower rock-fill concrete 1, and the upper seepage-proofing area 4 is positioned on the upstream surface of the upper rock-fill concrete 2.
One end of the water stop belt 6 is positioned in the middle of the lower anti-seepage zone 3, and the other end of the water stop belt is positioned in the middle of the upper anti-seepage zone 4.
The construction joint surface 5 has a plurality of layers, and the water stop belts 6 are arranged on each layer of construction joint surface 5 below the normal water storage level of the rock-fill concrete dam.
The construction method of the seepage-proofing structure based on the construction joint of the straight rockfill concrete dam comprises the following steps:
firstly, constructing 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 finished;
after the self-compacting concrete is poured in the lower anti-seepage area 3 and before the concrete is initially set, a water stop 6 is horizontally arranged in the middle position inside the lower anti-seepage area 3 at the upstream of the construction joint surface 5 along the axis direction of the dam, one end of the water stop 6 is embedded into the lower anti-seepage area 3 at the upstream, and the other end is exposed;
thirdly, manually finishing and smoothing the concrete in the lower anti-seepage area 3, and brushing or chiseling the construction joint surface 5;
fourthly, constructing upper-layer rock-fill concrete 2 on the construction joint surface 5 corresponding to the position of the lower-layer rock-fill concrete 1, and constructing an upper-layer anti-seepage area 4 corresponding to the position of the lower-layer anti-seepage area 3;
fifthly, after the construction of the upper rock-fill concrete 2 and the upper seepage-proofing area 4 is completed, the exposed section of the water stop belt 6 is embedded into the upper seepage-proofing area 4 on the upstream surface.
In the second step, the water stop belt 6 is arranged on the whole dam surface and is perpendicular to the construction joint surface 5.
The construction joint surface 5 has a plurality of layers, and the water stop belts 6 are arranged on each layer of construction joint surface 5 below the normal water storage level of the rock-fill concrete dam.
Preferably, the water stop belt 6 is broken when meeting the structural seam of the dam body and is respectively arranged inside the lower seepage-proofing zone 3 and the upper seepage-proofing zone 4.
Preferably, the water stop belt 6 is made of galvanized iron sheet with the thickness of 0.5mm, the width of the water stop belt is 40cm, the water stop belt is embedded in the lower anti-seepage area 3 by 20cm, and the water stop belt is embedded in the upper anti-seepage area 4 by 20 cm.
Examples
As described above, the seepage-proofing structure for the construction joint of the rockfill concrete dam is characterized in that the lower rockfill concrete 1 and the lower seepage-proofing area 3 at the upper part of the lower seepage-proofing area are constructed firstly, the construction joint face 5 is formed after the construction is finished, after the self-compacting concrete of the lower seepage-proofing area 3 is poured, before the concrete is initially set, namely the middle position inside the lower seepage-proofing area at the upper part of the construction joint face 5, the water stop belts 6 are horizontally arranged along the axial direction of the dam, the water stop belts 6 are arranged on the whole dam face, are perpendicular to the construction joint face 5, and break when meeting the structural joint of the dam.
Furthermore, the water stop belt 6 is made of galvanized iron sheet with the thickness of 0.5mm, the width of the water stop belt is 40cm, the water stop belt is embedded into the lower anti-seepage area 3 for 20cm, and the water stop belt leaks out of the surface of the construction joint surface for 5 cm.
Secondly, after the water stop belt 6 is installed, manually finishing and smoothing the concrete of the lower anti-seepage area 3 on the upstream surface, and roughening or chiseling the construction joint surface 5 according to a conventional construction joint surface treatment method.
And finally, after the upper-layer rockfill concrete 2 and the upper-layer seepage-proofing area 4 at the upstream of the upper-layer rockfill concrete are constructed, 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-stopping structure of the construction joint surface is formed.
Furthermore, the seepage-proofing structure is uniformly arranged on each layer of construction joint surface 5 below the normal water storage level of the rockfill concrete dam, namely, a plurality of seepage-proofing structures can be arranged below the normal water storage level of the rockfill concrete dam, so that the water seepage between the construction joint surface layers of the rockfill concrete dam can be effectively prevented.
Claims (8)
1. An anti-seepage structure for a construction joint of a rockfill concrete dam comprises lower rockfill concrete (1) and a lower anti-seepage area (3) arranged on one side of the lower rockfill concrete (1); the method is characterized in that: the upper end surface of the lower rock-fill concrete (1) is provided with an upper rock-fill concrete (2), one side of the upper rock-fill concrete (2) is provided with an upper anti-seepage area (4), and the upper anti-seepage area (4) corresponds to the lower anti-seepage area (3); the same construction joint surface (5) is arranged between the lower-layer rock-fill concrete (1) and the upper-layer rock-fill concrete (2) and between the lower-layer impervious area (3) and the upper-layer impervious area (4); a water stop (6) is arranged perpendicular to the construction joint surface (5), one end of the water stop (6) is arranged in the upper anti-seepage area (4), and the other end is arranged in the lower anti-seepage area (3).
2. The seepage prevention structure for construction joints of rockfill concrete dams of claim 1, wherein: and the water stop (6) is horizontally arranged on the whole dam surface along the axis direction of the dam.
3. The seepage prevention structure for construction joints of rockfill concrete dams of claim 1, wherein: the lower seepage-proofing area (3) is located on the upstream surface of the lower rock-fill concrete (1), and the upper seepage-proofing area (4) is located on the upstream surface of the upper rock-fill concrete (2).
4. The seepage prevention structure for construction joints of rockfill concrete dams of claim 1, wherein: one end of the water stop (6) is positioned in the middle of the lower anti-seepage area (3), and the other end of the water stop is positioned in the middle of the upper anti-seepage area (4).
5. The seepage prevention structure for construction joints of rockfill concrete dams of claim 1, wherein: the construction joint surface (5) is provided with a plurality of layers, and the water stop belts (6) are arranged on each layer of construction joint surface (5) below the normal water storage level of the rockfill concrete dam.
6. A construction method of a seepage-proofing structure of a construction joint of a rockfill concrete dam is characterized by comprising the following steps: the method comprises the following steps:
constructing 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 finished;
after the self-compacting concrete is poured in the lower-layer seepage-proofing area (3), before the concrete is initially set, a water stop (6) is horizontally arranged in the middle position inside the lower-layer seepage-proofing area (3) at the upstream of the construction joint surface (5) along the axis direction of the dam, one end of the water stop (6) is embedded into the lower-layer seepage-proofing area (3) at the upstream, and the other end is exposed;
thirdly, manually finishing and screeding the concrete in the lower anti-seepage area (3) and brushing or chiseling the construction joint surface (5);
fourthly, constructing upper-layer rock-fill concrete (2) on the construction joint surface (5) corresponding to the position of the lower-layer rock-fill concrete (1), and constructing an upper-layer anti-seepage area (4) corresponding to the position of the lower-layer anti-seepage area (3);
fifthly, after the upper rock-fill concrete (2) and the upper seepage-proofing area (4) are constructed, the exposed section of the water stop (6) is embedded into the upper seepage-proofing area (4) on the upstream surface.
7. The construction method of the seepage-proofing structure of the construction joint of the rockfill concrete dam as claimed in claim 6, wherein: in the second step, the water stop belt (6) is arranged on the whole dam surface and is vertical to the construction joint surface (5).
8. The construction method of the seepage-proofing structure of the construction joint of the rockfill concrete dam as claimed in claim 6, wherein: the construction joint surface (5) is provided with a plurality of layers, and the water stop belts (6) are arranged on each layer of construction joint surface (5) below the normal water storage level of the rockfill concrete dam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| 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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| CN110593200A true CN110593200A (en) | 2019-12-20 |
| CN110593200B CN110593200B (en) | 2024-03-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112962536A (en) * | 2021-02-09 | 2021-06-15 | 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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| 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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| CN112962536A (en) * | 2021-02-09 | 2021-06-15 | 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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| CN110593200B (en) | 2024-03-19 |
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