CN220868277U - Earth-rock dam preloading structure suitable for sand gravel foundation - Google Patents
Earth-rock dam preloading structure suitable for sand gravel foundation Download PDFInfo
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- CN220868277U CN220868277U CN202322654217.1U CN202322654217U CN220868277U CN 220868277 U CN220868277 U CN 220868277U CN 202322654217 U CN202322654217 U CN 202322654217U CN 220868277 U CN220868277 U CN 220868277U
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- 239000011435 rock Substances 0.000 title claims abstract description 55
- 239000004576 sand Substances 0.000 title claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000007599 discharging Methods 0.000 claims abstract description 19
- 239000000463 material Substances 0.000 claims abstract description 16
- 239000004575 stone Substances 0.000 claims description 7
- 238000011144 upstream manufacturing Methods 0.000 claims description 6
- 239000002689 soil Substances 0.000 claims description 2
- 230000002265 prevention Effects 0.000 claims 2
- 238000010276 construction Methods 0.000 abstract description 30
- 239000002699 waste material Substances 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 9
- 238000005266 casting Methods 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003908 quality control method Methods 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000000476 body water Anatomy 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000011257 shell material Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
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Abstract
The utility model belongs to the technical field of water conservancy and hydropower engineering, and particularly provides an earth-rock dam preloading structure suitable for a sand gravel foundation. The problems that an existing preloading structure cannot achieve good connection among a preloading platform, an earth-rock dam, a water discharging tower and a runner under the dam well, structural stability and reliability are not ideal enough, construction speed is reduced, filling materials are wasted, and overall construction quantity is increased are solved. The utility model improves the filling construction speed of the earth and rockfill under the premise of ensuring the stable and reliable pivot structure of the earth and rockfill dam and the effective and reliable preloading, avoids the condition of large-area waste of filling materials and reduces the construction work amount.
Description
Technical Field
The utility model belongs to the technical field of water conservancy and hydropower engineering, and particularly relates to an earth-rock dam preloading structure suitable for a sand gravel foundation.
Background
In order to improve unfavorable characteristics such as softness and easy deformation of the sand gravel foundation, the control hub sites such as a water discharging tower are required to be loaded with pre-pressure, so that pore water in the soil body is discharged along a water discharging plate and gradually consolidated, the foundation is promoted to be settled, and meanwhile, the strength is gradually improved. Common practice in general engineering is that the site surface is cleaned and leveled, a sand cushion layer is paved, earth and stone sides are filled in layers, preloading is carried out, unloading is carried out, and construction detection is carried out. However, the existing preloading structure cannot well achieve good connection among the preloading platform, the earth-rock dam, the water discharging tower and the runner under the dam, so that inconvenience exists in actual design and construction.
The Chinese patent literature with the publication number of CN112854144A and the publication date of 2021, 5 month and 28 discloses a construction structure of an earth and rockfill dam on a deep silt layer and a construction method thereof, wherein the structure comprises an upstream dike and a downstream dike, inner side reverse filters of the dike formed by casting and filling reverse filter materials are respectively arranged at the inner sides of the upstream dike and the downstream dike, an underwater casting and filling dam body is arranged between the inner side reverse filters of the upstream and the downstream dike, and the underwater casting and filling dam body is a structure formed by casting and filling coarse sand, and fills out water surface to flood elevation; a plastic drain board is arranged in the underwater filling dam body and the dam foundation silt layer and is used for vacuum preloading and vibroflotation encryption treatment; and a plastic concrete impervious wall is arranged on the underwater backfill dam body and the dam foundation silt layer, and a dam foundation curtain is arranged on the bedrock below the plastic concrete impervious wall. The document provides a soil-rock dam construction structure for direct underwater construction and a construction method thereof, wherein foundation pits and supports in the traditional sense are not needed on a deep silt layer, the deep silt layer is not needed to be excavated; the problem that the actual design and construction are inconvenient because the existing preloading structure cannot well achieve good connection among a preloading platform, an earth-rock dam, a water discharging tower and a runner under the dam is solved.
Disclosure of utility model
The utility model provides an earth-rock dam preloading structure suitable for a sand gravel foundation, which aims to solve the problems that the preloading structure in the prior art cannot better realize good connection among a preloading platform, an earth-rock dam, a water discharging tower and a runner under the dam, is not ideal in structural stability and reliability, reduces construction speed, wastes filling materials and increases overall construction amount.
The utility model provides an earth-rock dam preloading structure suitable for a sand gravel foundation, which comprises a permanent preloading platform, a temporary preloading platform, a water discharging tower, a runner under the dam and an earth-rock dam, wherein the temporary preloading platform is filled in the middle of the permanent preloading platform, the water discharging tower and the runner under the dam are sequentially filled in the middle of the temporary preloading platform from top to bottom, and the earth-rock dam is filled outside the permanent preloading platform and the temporary preloading platform.
Preferably, the filling materials of the permanent preloading platform and the temporary preloading platform are the same, and the filling materials are earth and rockfill dam filling materials.
Preferably, the permanent preloading platform is connected with the earth-rock dam, the side slope ratio of the connection is 1:m, and m is one of the upstream slope ratio 1:m1 and the downstream slope ratio 1:m2 of the earth-rock dam, and the numerical values of m1 and m2 are larger.
Preferably, the slope ratio of the temporary preloading platform is 1:m.
Preferably, the maximum dam height of the earth-rock dam is not more than 30m.
Preferably, the earth-rock dam is impermeable in form of a full basin.
Preferably, the length of the earth-rock dam is the sum of horizontal projections of the permanent preloading platform and the temporary preloading platform.
Preferably, the drainage tower and the under-dam runner are constructed after the temporary preloading platform is removed.
The utility model has the beneficial effects that:
1. The utility model provides an earth-rock dam preloading structure suitable for a sand gravel foundation, which comprises a permanent preloading platform, a temporary preloading platform, a water discharging tower, a dam lower runner and an earth-rock dam, wherein the temporary preloading platform is filled in the middle of the permanent preloading platform, the permanent preloading platform is filled, the water discharging tower and the dam lower runner are sequentially filled in the middle of the temporary preloading platform from top to bottom, and the earth-rock dam is filled outside the permanent preloading platform and the temporary preloading platform; the structure improves the filling construction speed of the earth and stone block under the premise of ensuring the stable and reliable pivot structure of the earth and stone dam and the effective and reliable preloading, avoids the large-area waste of filling materials and reduces the construction engineering quantity.
2. The earth-rock dam preloading structure suitable for the sand gravel foundation provided by the utility model has good reliability and stability as a part of dam body water retaining while realizing preloading effect by reasonably setting the preloading platform (the permanent preloading platform and the temporary preloading platform) filling parameters (compacting dry density requirement, preloading time and the like).
3. The earth-rock dam preloading structure suitable for the sand gravel foundation provided by the utility model can ensure reasonable and reliable connection of the earth-rock dam, the water discharging tower, the under-dam runner and the preloading platform structure and reduce the construction engineering quantity of the whole earth-rock dam junction by reasonably setting the preloading platform structure dimensions (dam height, length and the like).
Drawings
The present utility model will be described in further detail with reference to the accompanying drawings.
FIG. 1 is a top plan view of the structure of the present utility model;
FIG. 2 is a cross-sectional view of the structure of FIG. 1-1;
Fig. 3 is a cross-sectional view of the structure of fig. 1, 2-2.
Reference numerals illustrate: 1. a permanent preloading platform; 2. a temporary preloading platform; 3. a water discharge tower; 4. a flow passage under the dam; 5. earth and rockfill dams.
Detailed Description
Example 1:
As shown in fig. 1-3, the earth-rock dam preloading structure suitable for the sand gravel foundation comprises a permanent preloading platform 1, a temporary preloading platform 2, a water discharging tower 3, an under-dam runner 4 and an earth-rock dam 5, wherein the temporary preloading platform 2 is filled in the middle part of the permanent preloading platform 1, the water discharging tower 3 and the under-dam runner 4 are sequentially filled in the middle part of the temporary preloading platform 2 from top to bottom, and the earth-rock dam 5 is filled outside the permanent preloading platform 1 and the temporary preloading platform 2.
The structure improves the filling construction speed of the earth and stone block under the premise of ensuring the stable and reliable pivot structure of the earth and stone dam and the effective and reliable preloading, avoids the large-area waste of filling materials and reduces the construction engineering quantity.
Example 2:
On the basis of the embodiment 1, the permanent preloading platform 1 and the temporary preloading platform 2 are filled synchronously.
On the premise of ensuring the stable and reliable structure of the permanent preloading platform 1 and the temporary preloading platform 2, the construction speed is accelerated.
Preferably, the filling materials of the permanent preloading platform 1 and the temporary preloading platform 2 are the same, and are earth and rockfill dam filling materials.
The filling materials are the same, so that reasonable and reliable connection between the permanent preloading platform 1 and the temporary preloading platform 2, between the permanent preloading platform 1 and the earth-rock dam 5 and between the temporary preloading platform 2 and the earth-rock dam 5 is ensured, the construction quantity increased by various selected materials is avoided, and the construction cost is increased.
Preferably, the permanent preloading platform 1 is connected with the earth-rock dam 5, the side slope ratio of the connection is 1:m, and m is one of the upstream slope ratio 1:m1 and the downstream slope ratio 1:m2 of the earth-rock dam 5, and the numerical values of m1 and m2 are larger.
The stability is better, and the structure is more reliable.
Preferably, the slope ratio of the temporary preloading platform 2 is 1:m.
Namely, the slope ratio is the same, and the pile load slope stability under each level of load is improved.
Preferably, the water discharging tower 3 and the under-dam runner 4 are constructed after the temporary preloading platform 2 is removed.
The water discharging tower 3 and the under-dam runner 4 are not constructed before the temporary preloading platform 2 is removed, and are constructed after the temporary preloading platform 2 is removed, so that the space is fully utilized.
Example 3:
on the basis of embodiment 2, the maximum dam height of the earth-rock dam 5 is not more than 30m. The earth-rock dam 5 in this range has better structural stability.
Preferably, the earth and rockfill dam 5 is impermeable in the form of a full basin. The seepage-proofing effect of the earth-rock dam 5 is improved.
Preferably, the length of the earth-rock dam 5 is the sum of horizontal projections of the permanent preloading platform 1 and the temporary preloading platform 2.
Specifically, the earth-rock dams 5 are located at two sides of the permanent preloading platform 1, the lengths of the earth-rock dams are L, and the L is the sum of horizontal projections of the permanent preloading platform 1 and the temporary preloading platform 2. The earth-rock dam 5 is not constructed before the completion of the water discharge tower 3 and the under-dam runner 4, and is constructed and filled after the completion of the water discharge tower 3 and the under-dam runner 4. The construction amount and the construction engineering amount are reduced, the construction speed is improved, and the stability and the reliability of the whole structure are improved.
Preferably, the compaction dry density requirements of the permanent preloading platform 1 and the temporary preloading platform 2 are controlled according to the sand and gravel dam shell material on-site rolling quality control curve calculated by the earth and gravel dam rolling test, so as to achieve the target requirements. In the field detection test, the maximum dry density and the minimum dry density of gravel stones in the same pilot hole are respectively measured by adopting a preloading platform (a permanent preloading platform 1 and a temporary preloading platform 2), and rolling quality control curves are compared.
The construction method of the utility model comprises the following steps:
When the hydraulic and hydroelectric engineering is constructed, firstly, a permanent preloading platform 1 and a temporary preloading platform 2 are filled simultaneously, wherein the temporary preloading platform 2 is positioned in the filling permanent preloading platform 1; then, the temporary preloading platform 2 is dismantled, and a water discharging tower 3 and an under-dam runner 4 are built at the position of the temporary preloading platform 2 before the dismantling; and finally, filling the earth-rock dam 5 on the outer side of the filling permanent preloading platform 1 to finish the construction.
The specific operation method comprises the following steps:
Before filling the earth-rock dam preloading structure suitable for the sand gravel foundation, stripping large-particle boulders on the surface layer, filling nearby earth materials in layers, and after each layer of filling, carrying out bulldozing, leveling and compacting, carrying out next preloading to ensure the preloading slope stability under each level of load; and then the construction is completed according to a construction method.
When the temporary preloading platform 2 is dismantled, the slope line is strictly dismantled according to the design, the excavation slope ratio and the pavement elevation are controlled, and the permanent preloading platform in the design dismantling line cannot be damaged. The preloading time should be not less than the design requirement during and after the preloading is completed, and the unloading time of the temporary preloading platform 2 should be calculated and determined according to the sedimentation observation data, in principle not less than 2 months. The instrument and the original elements for observing the dam foundation are buried before the construction of the preloading structure.
In the description of the present utility model, it should be understood that, if any, the terms "outer," "inner," and the like indicate an orientation or a positional relationship based on that shown in the drawings, rather than indicate or imply that the devices or elements being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus the terms describing the positional relationship in the drawings are merely for illustration and are not to be construed as limiting the utility model.
The foregoing examples are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model, and all designs that are the same or similar to the present utility model are within the scope of the present utility model.
Claims (8)
1. The utility model provides a soil stone dam preloading structure suitable for sand gravel basis which characterized in that: the device comprises a permanent preloading platform (1), a temporary preloading platform (2), a water discharging tower (3), an under-dam runner (4) and an earth-rock dam (5), wherein the temporary preloading platform (2) is filled in the middle of the permanent preloading platform (1), the water discharging tower (3) and the under-dam runner (4) are sequentially built from top to bottom in the middle of the temporary preloading platform (2), and the earth-rock dam (5) is filled in the outer sides of the permanent preloading platform (1) and the temporary preloading platform (2).
2. The earth-rock dam preloading structure suitable for sand-gravel foundations of claim 1, wherein: the filling materials of the permanent preloading platform (1) and the temporary preloading platform (2) are the same, and are earth and rockfill dam filling materials.
3. The earth-rock dam preloading structure suitable for sand-gravel foundations of claim 1, wherein: the permanent preloading platform (1) is connected with the earth-rock dam (5), the connected side slope ratio is 1:m, and m is one of the upstream slope ratio 1:m1 and the downstream slope ratio 1:m2 of the earth-rock dam (5), wherein the values of m1 and m2 are larger.
4. The earth-rock dam preloading structure suitable for sand-gravel foundations of claim 3, wherein: the side slope ratio of the temporary preloading platform (2) is 1:m.
5. The earth-rock dam preloading structure suitable for sand-gravel foundations of claim 1, wherein: the maximum dam height of the earth-rock dam (5) is not more than 30m.
6. The earth-rock dam preloading structure suitable for sand-gravel foundations of claim 1, wherein: the seepage prevention mode of the earth-rock dam (5) is full-reservoir basin seepage prevention.
7. The earth-rock dam preloading structure suitable for sand-gravel foundations of claim 1, wherein: the length of the earth-rock dam (5) is the sum of horizontal projections of the permanent preloading platform (1) and the temporary preloading platform (2).
8. The earth-rock dam preloading structure suitable for sand-gravel foundations of claim 1, wherein: and the water discharging tower (3) and the under-dam runner (4) are constructed after the temporary preloading platform (2) is removed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322654217.1U CN220868277U (en) | 2023-09-28 | 2023-09-28 | Earth-rock dam preloading structure suitable for sand gravel foundation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322654217.1U CN220868277U (en) | 2023-09-28 | 2023-09-28 | Earth-rock dam preloading structure suitable for sand gravel foundation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220868277U true CN220868277U (en) | 2024-04-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322654217.1U Active CN220868277U (en) | 2023-09-28 | 2023-09-28 | Earth-rock dam preloading structure suitable for sand gravel foundation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220868277U (en) |
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2023
- 2023-09-28 CN CN202322654217.1U patent/CN220868277U/en active Active
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