CN212248090U - Waterproof horizontal water leakage structure for roller compacted concrete dam intermittent layer in severe cold area - Google Patents
Waterproof horizontal water leakage structure for roller compacted concrete dam intermittent layer in severe cold area Download PDFInfo
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- CN212248090U CN212248090U CN202020949433.2U CN202020949433U CN212248090U CN 212248090 U CN212248090 U CN 212248090U CN 202020949433 U CN202020949433 U CN 202020949433U CN 212248090 U CN212248090 U CN 212248090U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 239000011382 roller-compacted concrete Substances 0.000 title claims abstract description 16
- 239000004567 concrete Substances 0.000 claims abstract description 44
- 239000004927 clay Substances 0.000 claims abstract description 23
- 239000004746 geotextile Substances 0.000 claims description 15
- 239000011178 precast concrete Substances 0.000 claims description 4
- 230000002265 prevention Effects 0.000 claims description 4
- 230000003044 adaptive effect Effects 0.000 claims description 3
- 238000005336 cracking Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 239000010419 fine particle Substances 0.000 claims description 3
- 238000005266 casting Methods 0.000 abstract description 5
- 238000010276 construction Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 239000004744 fabric Substances 0.000 abstract description 3
- 235000006040 Prunus persica var persica Nutrition 0.000 description 1
- 240000006413 Prunus persica var. persica Species 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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Abstract
The utility model discloses a severe cold area roller compacted concrete dam intermittent type layer is waterproof flat hourglass structure, including the lower floor cast in advance the concrete layer, cast in advance the concrete layer after the upper strata that lower floor cast in advance concrete layer upper portion was pour in advance, cast in advance the concrete layer and the upper strata at the lower floor and pour in advance the horizontal drawing crack of possibility that exists between the concrete layer, the preformed groove that sets up before casting in advance the concrete layer after the upper strata on lower floor cast in advance the concrete layer, the preformed groove is inside to set up geotechnological cloth near the downstream side, backfill clay in the preformed groove inside. The structure effectively prevents the water leakage of the dam body when water flat opening cracks exist through clay backfilled in the reserved groove, and has the advantages of convenient construction, small investment and good effect.
Description
Technical Field
The utility model relates to a severe cold area roller compacted concrete dam intermittent type layer is waterproof to leak water structure.
Background
When a roller compacted concrete gravity dam is built in a severe cold area, cracks often appear due to severe weather conditions, such as cold, hot, wind and dry. The cold is that the average temperature per year in a severe cold area is very low, the average temperature per month in winter is below-10 ℃, the cold tide is frequent all the year round, and the temperature difference between day and night is large; "Hot" means that the temperature is high in summer, and the average temperature is about 20 ℃ in summer; wind refers to severe cold areas with strong wind power, strong wind speed and easy evaporation of water; the term "dry" refers to the climate dryness in spring and autumn in alpine regions, and these climate characteristics are extremely unfavorable for the temperature control and crack prevention of roller compacted concrete. The stable temperature of the dam body is low due to low annual average temperature, and the highest temperature of concrete poured in summer is high, so that the temperature difference of the dam foundation is large (often exceeding the specification), and foundation penetrating cracks are often generated due to large temperature difference of the foundation; the cold tide is frequent all the year round, the temperature difference between day and night is large, and the concrete poured first and the concrete poured later form large temperature difference due to the existence of the intermission period, so that horizontal cracks appear, and the water leakage of the dam body is further caused. Research shows that the tensile strength between horizontal layers is only 41-86% of that of the original concrete, so that the horizontal cracking phenomenon is easy to form. In engineering practice, horizontal cracks appear in an upper static dam of the United states, a Yuchuan dam of Japan, a Guanyin pavilion dam of Liaoning, a Songyue dam, a Manchentai dam, a Hebei peach forest mouth dam, a Chinese iris river mouth dam, a Xinjiang Duoli dam and the like, and water leakage of a dam body is caused, so that the problems are urgently solved.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a cold area roller compacted concrete dam intermittent type layer is waterproof flat water leakage structure is provided, through at the lower floor at the last preformed groove of earlier casting concrete layer, lay geotechnological cloth, fill and build the clay, the production of dam body percolating water when effectively preventing water flat opening crack to exist.
The technical scheme of the utility model:
a waterproof horizontal water leakage structure of an intermittent layer of a roller compacted concrete dam in a severe cold region comprises a lower layer cast-in-advance concrete layer 1, an upper layer cast-in-advance concrete layer 2, a horizontal cracking seam 3, a reserved groove 4, clay 5 and geotextile 6;
a reserved groove 4 is formed in the lower precast concrete layer 1, geotextile 6 is laid in the reserved groove 4 and filled with clay 5, and the geotextile 6 is used for preventing fine particles in the clay 5 from being taken away to play a role in reverse filtration protection; the upper part of the lower layer cast-in-advance concrete layer 1 is an upper layer cast-in-advance concrete layer 2, and a horizontal opening crack 3 exists between the upper layer cast-in-advance concrete layer and the lower layer cast-in-advance concrete layer; the clay 5 adapts to temperature stress expansion and deformation between the upper post-cast concrete layer 2 and the lower pre-cast concrete layer 1 due to good plasticity and adaptive deformation capability, so that the function of seepage prevention is achieved.
The utility model has the advantages that: the structure effectively prevents the water leakage of the dam body when water flat opening cracks exist through clay backfilled in the reserved groove, and has the advantages of convenient construction, small investment and good effect.
Drawings
FIG. 1 is a structural diagram of horizontal water leakage prevention of an intermittent layer of a roller compacted concrete dam in a severe cold area.
In the figure: 1, firstly pouring a concrete layer on the lower layer; 2, casting a concrete layer on the upper layer; 3 horizontal opening crack; 4, reserving a groove; 5, clay; 6, geotextile.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, a severe cold region roller compacted concrete dam intermittent layer waterproof flat water leakage structure, including lower floor cast in advance concrete layer 1, the upper strata cast in advance concrete layer 2 that the intermittent type was poured in advance concrete layer 1 upper portion of lower floor for a period of time, the horizontal opening crack 3 that probably exists between lower floor cast in advance concrete layer 1 and upper strata cast in advance concrete layer 2, reserve groove 4 that sets up before lower floor cast in advance concrete layer 1 cast in advance concrete layer 2 of upper strata, reserve groove 4 inside sets up geotechnological cloth 6 near the downstream side, backfill clay 5 in reserve groove 4 inside.
The upper layer cast-before-casting concrete layer 2 cast on the upper part of the lower layer cast-before-casting concrete layer 1 is intermittently cast for a period of time, and the intermittent time is more than or equal to 7 days;
the size of the reserve tank 4 is 30cm multiplied by 60cm (height multiplied by width), and the width can be properly adjusted according to the dam front water head;
the clay backfilled in the preformed groove 4 has a clay content of more than or equal to 20 percent and a plasticity index of more than or equal to 20 percent, and is preferably heavy loam or heavy silty clay;
the height of the post-cast concrete layer 2 is more than or equal to 30cm by arranging geotextile 6 near the downstream side in the reserved groove 4 and burying the geotextile 6 in the upper layer.
In the present embodiment, the construction is performed according to the following steps: after the lower layer of the first-cast concrete layer is poured, a reserved groove is formed in the lower layer of the first-cast concrete layer, geotextile is laid in the reserved groove, clay is backfilled, and the geotextile is used for preventing fine particles in the clay from being taken away to play a role in reverse filtration protection. The cohesive soil can adapt to the temperature stress expansion deformation between the upper post-cast concrete layer and the lower newly-cast concrete layer due to the good plasticity and the adaptive deformation capability, so that the anti-seepage effect is achieved, and the whole construction is completed.
The above-mentioned examples are only for illustrating the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the same, and the scope of the present invention should not be limited by the examples, i.e. all equivalent changes or modifications made by the spirit of the present invention are still within the scope of the present invention.
Claims (6)
1. A waterproof horizontal water leakage structure of an intermittent layer of a roller compacted concrete dam in a severe cold area is characterized by comprising a lower layer cast-in-advance concrete layer (1), an upper layer cast-in-advance concrete layer (2), a horizontal cracking seam (3), a reserved groove (4), clay (5) and geotextile (6);
the lower precast concrete layer (1) is provided with a reserved groove (4), geotextile (6) is laid in the reserved groove (4) and filled with clay (5), and the geotextile (6) is used for preventing fine particles in the clay (5) from being taken away to play a role in reverse filtration protection; the upper part of the lower layer cast-in-advance concrete layer (1) is an upper layer cast-in-advance concrete layer (2), and a horizontal opening crack (3) exists between the upper layer cast-in-advance concrete layer and the upper layer cast-in-advance concrete layer; the clay (5) adapts to temperature stress expansion deformation between the upper post-cast concrete layer (2) and the lower pre-cast concrete layer (1) due to good plasticity and adaptive deformation capability, so that the function of seepage prevention is achieved.
2. The severe cold region roller compacted concrete dam intermittent layer waterproof horizontal water leakage structure according to claim 1, wherein the height x width of the reserve tank (4) is 30cm x 60 cm.
3. The severe cold region roller compacted concrete dam intermittent layer waterproof horizontal water leakage structure as claimed in claim 1 or 2, wherein clay (5) has a clay content of not less than 20% and a plasticity index of not less than 20%.
4. The severe cold region roller compacted concrete dam intermittent layer waterproof horizontal water leakage structure according to claim 3, wherein the clay (5) is heavy loam or heavy silty clay.
5. The severe cold region roller compacted concrete dam intermittent layer waterproof horizontal water leakage structure according to claim 1, 2 or 4, characterized in that a geotextile (6) is arranged near the downstream side in the reserved groove (4), and the height of the cast-in-place concrete layer (2) after the geotextile (6) is embedded into the upper layer is more than or equal to 30 cm.
6. The severe cold region roller compacted concrete dam intermittent layer waterproof horizontal water leakage structure is characterized in that geotextile (6) is arranged in the reserved groove (4) close to the downstream side, and the height of the poured concrete layer (2) after the geotextile (6) is buried in the upper layer is more than or equal to 30 cm.
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| CN202020949433.2U CN212248090U (en) | 2020-05-29 | 2020-05-29 | Waterproof horizontal water leakage structure for roller compacted concrete dam intermittent layer in severe cold area |
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| CN202020949433.2U CN212248090U (en) | 2020-05-29 | 2020-05-29 | Waterproof horizontal water leakage structure for roller compacted concrete dam intermittent layer in severe cold area |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111549725A (en) * | 2020-05-29 | 2020-08-18 | 大连理工大学 | Waterproof horizontal water leakage structure for roller compacted concrete dam intermittent layer in severe cold area |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111549725A (en) * | 2020-05-29 | 2020-08-18 | 大连理工大学 | Waterproof horizontal water leakage structure for roller compacted concrete dam intermittent layer in severe cold area |
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