CN210827336U - Rockfill concrete dam construction joint seepage prevention structure - Google Patents
Rockfill concrete dam construction joint seepage prevention structure Download PDFInfo
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- CN210827336U CN210827336U CN201921316240.7U CN201921316240U CN210827336U CN 210827336 U CN210827336 U CN 210827336U CN 201921316240 U CN201921316240 U CN 201921316240U CN 210827336 U CN210827336 U CN 210827336U
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Abstract
The utility model provides a rockfill concrete dam construction joint seepage prevention structure, including lower floor's rockfill concrete and the lower floor's seepage prevention district of setting in lower floor's rockfill concrete one side. The utility model discloses arrange one waterstop in the middle of the seepage prevention district of every layer of construction joint face upper reaches of rockfill concrete dam, the waterstop is inlayed in lower floor concrete and upper concrete, can effectively prevent rockfill concrete dam construction joint face interlaminar infiltration, avoids influencing dam concrete's durability and engineering appearance quality because of interlaminar infiltration, lays the basis for building the watertight dam, lets behind the reservoir retaining dam downstream face appear the phenomenon of interlaminar infiltration no longer take place, has solved the problem of construction joint face infiltration; under the prerequisite that reaches equal effect, the utility model discloses simple structure, construction process is simple, construction speed is fast, does not need special material, and used galvanized iron cost is low, light in weight, energy-concerving and environment-protective, practices thrift the engineering investment than traditional technology.
Description
Technical Field
The utility model relates to a rockfill concrete dam construction joint seepage prevention structure belongs to rockfill concrete dam technical field.
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.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a rockfill concrete dam construction joint seepage prevention structure, this rockfill concrete dam construction joint seepage prevention structure and construction method simple structure, construction process is simple, construction speed is fast, does not need special material, and used galvanized iron sheet cost is low, light in weight, energy-concerving and environment-protective, can also practice thrift the engineering investment than traditional technology.
The utility model discloses a following technical scheme can realize.
The utility model provides a construction joint seepage-proofing structure of a rock-fill concrete dam, which comprises lower rock-fill concrete and a lower seepage-proofing area arranged at one side of the lower rock-fill 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 beneficial effects of the utility model reside in 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; under the prerequisite that reaches equal effect, the utility model discloses simple structure, construction process is simple, construction speed is fast, does not need special material, and used galvanized iron cost is low, light in weight, energy-concerving and environment-protective, practices thrift the engineering investment than traditional technology.
Drawings
Fig. 1 is a schematic structural diagram 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 utility model discloses a construction method, including following step:
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;
③, 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;
⑤, 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 step ②, 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.
Furtherly, every layer of construction seam face 5 all arranges below the normal retaining position of rockfill concrete dam seepage prevention structure, this structure can set up a plurality of below the normal retaining position of rockfill concrete dam promptly, can effectively prevent infiltration between rockfill concrete dam construction seam face layer.
Claims (5)
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921316240.7U CN210827336U (en) | 2019-08-14 | 2019-08-14 | Rockfill concrete dam construction joint seepage prevention structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921316240.7U CN210827336U (en) | 2019-08-14 | 2019-08-14 | Rockfill concrete dam construction joint seepage prevention structure |
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| CN210827336U true CN210827336U (en) | 2020-06-23 |
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| CN201921316240.7U Active CN210827336U (en) | 2019-08-14 | 2019-08-14 | Rockfill concrete dam construction joint seepage prevention structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110593200A (en) * | 2019-08-14 | 2019-12-20 | 中国电建集团贵阳勘测设计研究院有限公司 | Seepage-proofing structure for construction joint of rockfill concrete dam and construction method thereof |
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2019
- 2019-08-14 CN CN201921316240.7U patent/CN210827336U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110593200A (en) * | 2019-08-14 | 2019-12-20 | 中国电建集团贵阳勘测设计研究院有限公司 | Seepage-proofing structure for construction joint of rockfill concrete dam and construction method thereof |
| CN110593200B (en) * | 2019-08-14 | 2024-03-19 | 中国电建集团贵阳勘测设计研究院有限公司 | Anti-seepage structure for construction joint of rock-fill concrete dam and construction method thereof |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20221102 Address after: 550000 No. 16 Xingqian Road, Guanshan Lake District, Guiyang City, Guizhou Province Patentee after: China water resources and hydropower construction engineering consulting Guiyang Co.,Ltd. Address before: 550081 Xingshan Lake District, Guiyang, Guizhou Province, No. 16 Patentee before: CHINA POWER CONSRTUCTION GROUP GUIYANG SURVEY AND DESIGN INSTITUTE Co.,Ltd. |
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| TR01 | Transfer of patent right |