CN219862610U - Scour prevention structure for large drop zone of river channel - Google Patents
Scour prevention structure for large drop zone of river channel Download PDFInfo
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- CN219862610U CN219862610U CN202320331994.XU CN202320331994U CN219862610U CN 219862610 U CN219862610 U CN 219862610U CN 202320331994 U CN202320331994 U CN 202320331994U CN 219862610 U CN219862610 U CN 219862610U
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- 230000002265 prevention Effects 0.000 title claims abstract description 44
- 239000004927 clay Substances 0.000 claims abstract description 70
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 52
- 239000002689 soil Substances 0.000 claims abstract description 32
- 238000009991 scouring Methods 0.000 claims abstract description 31
- 239000004575 stone Substances 0.000 claims abstract description 27
- 239000004576 sand Substances 0.000 claims abstract description 26
- 239000002002 slurry Substances 0.000 claims abstract description 18
- 239000002131 composite material Substances 0.000 claims abstract description 17
- 239000004746 geotextile Substances 0.000 claims abstract description 13
- 239000004744 fabric Substances 0.000 claims abstract description 6
- 238000010276 construction Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 238000000034 method Methods 0.000 description 4
- 230000003628 erosive effect Effects 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000009958 sewing Methods 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The utility model discloses an anti-scouring structure for a large drop zone of a river, which comprises a first anti-scouring structure and a second anti-scouring structure. The first scour prevention structure is constructed at the position of a low river bed and comprises a coarse sand cushion layer, a composite geomembrane, a fine soil cushion layer, geotextile and a slurry block stone layer which are sequentially arranged from bottom to top; an upstream clay layer is arranged at the bottom of the upstream end of the first scour prevention structure; the top surface of the upstream clay layer is sequentially provided with a first rear flat top surface, a first inclined top surface and a first front flat top surface from upstream to downstream; the second scour prevention structure is connected to the downstream end of the first scour prevention structure, has the same elevation and comprises a downstream clay layer, a composite geomembrane, a fine-grained soil cushion layer, geotechnical cloth and gabion layers which are sequentially arranged from bottom to top; the upstream end face of the downstream clay layer is an inclined plane, and the top face of the downstream clay layer is a second rear flat top face, a second inclined top face and a second front flat top face in sequence from upstream to downstream. The utility model has stable structure, good seepage-proofing effect and convenient construction.
Description
Technical Field
The utility model relates to an anti-scouring structure for a large drop zone of a river channel.
Background
Common scour protection structures are various forms of concrete blocks, dry masonry, wire cages, and the like. The concrete is used in large amount and high cost, and the quality of the concrete, the pouring continuity and timeliness are difficult to strictly control, so that concrete cracks are easy to generate; and the dry masonry and the lead wire cage cannot meet the seepage-proofing effect and cannot effectively store water.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art and provide an anti-scouring structure for a large drop zone of a river channel, which can reduce construction investment and construction cost.
The purpose of the utility model is realized in the following way: an anti-scouring structure for a large drop zone of a river comprises a first anti-scouring structure and a second anti-scouring structure, wherein,
the first scour prevention structure is constructed at the position of a low river bed and comprises a coarse sand cushion layer, a composite geomembrane, a fine soil cushion layer, geotextile and a slurry block stone layer which are sequentially arranged from bottom to top; the bottom of the upstream end of the first anti-scouring structure is provided with an anti-seepage structure; the seepage-proofing structure comprises an upstream clay layer, a composite geomembrane, a fine soil cushion layer, geotextile and a slurry block stone layer which are sequentially arranged from bottom to top; the bottom surface of the upstream clay layer is lower than the river bed surface, the upstream end surface and the downstream end surface of the upstream clay layer are vertical surfaces, and the top surface of the upstream clay layer is a first rear flat top surface, a first inclined top surface and a first front flat top surface with the same elevation as that of the coarse sand cushion layer of the first anti-scouring structure, wherein the elevation of the first rear flat top surface, the first inclined top surface and the elevation of the coarse sand cushion layer of the first anti-scouring structure are lower than that of the river bed surface from upstream to downstream;
the second scour prevention structure is connected to the downstream end of the first scour prevention structure, the downstream end face of the second scour prevention structure is a vertical face, and the second scour prevention structure comprises a downstream clay layer, a composite geomembrane, a fine-grained soil cushion layer, geotechnical cloth and gabion layers which are sequentially arranged from bottom to top; the bottom surface of the downstream clay layer is lower than the river bed surface, the elevation of the bottom surface is the same as that of the bottom surface of the upstream clay layer, the upstream end surface of the downstream clay layer is an inclined surface, the downstream end surface of the downstream clay layer is a vertical surface, and the top surface of the downstream clay layer is sequentially a second rear flat top surface, a second inclined top surface and a second front flat top surface, wherein the elevation of the second rear flat top surface is the same as that of the coarse sand cushion layer of the first anti-scouring structure, the elevation of the second front flat top surface is lower than that of the river bed surface, and the elevation of the second front flat top surface is the same as that of the first front flat top surface of the upstream clay layer;
the elevation of the first scour prevention structure is the same as the elevation of the second scour prevention structure.
The anti-scouring structure for the river channel large drop area, wherein the thickness of the upstream clay layer and the thickness of the downstream clay layer are 0.8-1.5 m, and the compactness is more than or equal to 0.97; the length of the upstream clay layer is 2m; the length of the downstream clay layer is 7m; the slope ratio of the first inclined top surface of the upstream clay layer, the slope ratio of the upstream end surface of the downstream clay layer and the slope ratio of the second inclined top surface of the downstream clay layer are all 1:1.
the anti-scouring structure for the river channel large drop area, wherein the thickness of the coarse sand cushion layer is 9-11 cm; the thickness of the fine-grained soil cushion layer is 25-35 cm; the thickness of the slurry block stone layer of the first scour prevention structure is 50cm; the thickness of the gabion layer is 1m.
According to the scour prevention structure for the river channel large drop area, the fineness modulus of the coarse sand cushion layer is 3.6-3.2, and coarse sand with the mud content less than or equal to 5% is paved.
The anti-scouring structure for the river channel large drop area is characterized in that the fine-grained soil cushion layer is paved by fine-grained soil with the grain diameter less than or equal to 4cm, and the compactness of the fine-grained soil cushion layer is more than or equal to 0.97.
The scour prevention structure for the river channel large drop area has the following characteristics:
1) The materials such as clay, fine soil, composite geomembranes and the like are adopted as the seepage-proofing structure at the bottoms of the river channels at the two ends, so that the seepage-proofing effect is effectively achieved, and water can be effectively stored;
2) The top of the scour prevention structure adopts the slurry block stone layer and the gabion stone layer respectively, so that the stability is good, the service life is long, the hydraulic scour can be effectively resisted, and the influence on the flood discharge function caused by the damage of the hydraulic power to the river structure is avoided;
3) The scour prevention structure of the utility model can be obtained locally, has low cost, simple process and convenient construction.
Drawings
FIG. 1 is a cross-sectional view of an anti-scour structure for large drop zones of a river of the present utility model;
fig. 2 is a plan view of the erosion preventing structure for a large drop zone of a river according to the present utility model.
Detailed Description
The utility model will be further described with reference to the accompanying drawings.
Referring to fig. 1 and 2, the anti-scouring structure for a large drop zone of a river according to the present utility model includes a first anti-scouring structure 10 and a second anti-scouring structure 20.
The first scour prevention structure 10 is built at the position of a low river bed and comprises a coarse sand cushion layer 2, a composite geomembrane 3, a fine soil cushion layer 4, geotextile 5 and a grouted block stone layer 6 which are sequentially arranged from bottom to top; the bottom of the upstream end of the first anti-scouring structure is provided with an anti-seepage structure; the seepage-proofing structure comprises an upstream clay layer 1A, a composite geomembrane 3, a fine-grained soil cushion layer 4, geotextiles 5 and a grouted block stone layer 6 which are sequentially arranged from bottom to top; the bottom surface of the upstream clay layer 1A is lower than the river bed surface, the upstream end surface and the downstream end surface of the upstream clay layer 1A are vertical surfaces, and the top surface of the upstream clay layer 1A is a first rear flat top surface, a first inclined top surface and a first front flat top surface with the same elevation as that of the coarse sand cushion 2 of the first anti-scouring structure 10, wherein the elevation of the first rear flat top surface is lower than that of the river bed surface from upstream to downstream; the slope ratio of the first inclined top surface is 1:1, a step of;
the thickness of the coarse sand cushion layer 2 in the first scour prevention structure 10 is 9-11 cm, the coarse sand cushion layer 2 is paved by coarse sand with the fineness modulus of 3.6-3.2 and the mud content of less than or equal to 5%; the thickness of the fine-grained soil cushion layer 4 is 25-35 cm; the fine-grained soil cushion layer 4 is paved by fine-grained soil with the grain diameter less than or equal to 4cm, and the compactness is more than or equal to 0.97; the composite geomembrane 3 has a three-layer structure, namely a two-cloth one-membrane structure; the thickness of the slurry block stone layer 6 is 50cm; the upstream clay layer 1A has a length of 2m and a thickness of 0.8 to 1.5m.
The second scour prevention structure 20 is connected to the downstream end of the first scour prevention structure 10, the downstream end surface of the second scour prevention structure 20 is a vertical surface, and the second scour prevention structure 20 comprises a downstream clay layer 1B, a composite geomembrane 3, a fine-grained soil cushion layer 4, geotechnical cloth 5 and gabion layers 7 which are sequentially arranged from bottom to top; the bottom surface of the downstream clay layer 1B is lower than the river bed surface and the elevation of the bottom surface is the same as that of the bottom surface of the upstream clay layer 1A, the upstream end surface of the downstream clay layer 1B is an inclined surface, the downstream end surface of the downstream clay layer 1B is a vertical surface, and the top surface of the downstream clay layer 1B is a second rear flat top surface with the elevation same as that of the coarse sand cushion 2 of the first anti-scouring structure 10, a second inclined top surface and a second front flat top surface with the elevation same as that of the first front flat top surface of the upstream clay layer 1A, wherein the elevation of the second rear flat top surface is lower than that of the river bed surface; the slope ratio of the upstream end face of the downstream clay layer 1B and the slope ratio of the second sloping top face are both 1:1.
the thickness of the coarse sand cushion layer 2 in the second scour prevention structure 20 is 9-11 cm, the coarse sand cushion layer 2 is paved by coarse sand with the fineness modulus of 3.6-3.2 and the mud content of less than or equal to 5%; the thickness of the fine-grained soil cushion layer 4 is 25-35 cm; the fine-grained soil cushion layer 4 is paved by fine-grained soil with the grain diameter less than or equal to 4cm, and the compactness is more than or equal to 0.97; the composite geomembrane 3 is of a three-layer structure, namely, is formed by compositing two layers of geotextiles and a layer of geomembrane which is sandwiched between the two layers of geotextiles; the thickness of the gabion layer 7 is 1m; the downstream clay layer 1B has a length of 7m and a thickness of 0.8 to 1.5m.
The elevation of the first erosion preventing structure 10 is the same as the elevation of the second erosion preventing structure 20.
The slurry block stone layer 6 is formed by building a plurality of stones; gabion 7 is formed by a plurality of stones piled up in a cage made of wire-knitted angular mesh.
The utility model relates to an anti-scouring structure for a large drop zone of a river, which comprises the following steps:
firstly, performing surface soil cleaning on an original river channel at the bottom of a first scour prevention structure 10 and a second scour prevention structure 20, performing earthwork shaping on the river channel through earthwork excavation and earthwork backfill, ensuring that the substrates of an upstream clay layer 1A and a downstream clay layer 1B reach the design elevation requirement, and shaping the upstream end face of the downstream clay layer 1B into a slope ratio of 1:1, a step of;
step two, at the upstream clay layer 1A and the downstream clay layer 1B of the shaped river channel substrate, clay of the upstream clay layer 1A and clay of the downstream clay layer 1B are filled back in layers according to the thickness of 30cm, and are rolled in layers by a road roller, wherein the compaction degree is more than or equal to 0.97, and finally the thickness of the upstream clay layer 1A and the downstream clay layer 1B is 0.8m;
step three, paving a coarse sand cushion layer 2 with the thickness of 9cm on the substrate of the first scour prevention structure 10;
step four, paving composite geomembranes 3 on the top surface of the upstream clay layer 1A, the top surface of the coarse sand cushion layer 2 and the top surface of the downstream clay layer 1B respectively, and adopting a seam welder for double-sided hot-melt welding between the membranes to ensure tight and airtight connection;
paving fine soil with the grain diameter less than or equal to 4cm on the top surface of the composite geomembrane 3, and then rolling and tamping by adopting a 20T road roller to form a fine soil cushion layer 4 with the thickness of 30 cm;
step six, laying geotextile 5 on the top surface of the fine-grained soil cushion layer 4, connecting the cloth by adopting a sewing method, and pressing the end part of the geotextile 5 into the fine-grained soil cushion layer 4;
step seven, a slurry block stone layer 6 is laid on the top surface of the geotextile 5 of the first scour prevention structure 10, and a gabion layer 7 is arranged on the top surface of the geotextile 5 of the second scour prevention structure 20; the slurry block stone layer 6 is constructed by a block stone through a slurry setting method, and the strength of the slurry is M1; when the slurry block stone layer 6 is constructed, an expansion joint with the width of 2cm is arranged at intervals of 40cm, a rubber water stop belt and a closed-pore foam board are pre-embedded in the expansion joint in advance, epoxy resin is filled in the expansion joint after the construction of the slurry block stone layer 6 is completed, so that the waterproof effect is improved, the expansion deformation is resisted, the thickness of the final slurry block stone layer 6 is 50cm, and the outer surface is subjected to joint pointing treatment; the gabion layer 7 is a rectangular box-type gabion which is made by adopting an angular net woven by metal wires, large stones are filled in the gabion, and then small stones are used for filling the rest space, so that the gabion is fully filled, the final filling height is 1m, and the surface is reinforced and covered by using net wires.
The flow velocity of water is high due to the fact that the river topography fall is large, and the anti-scouring structure for the large-fall area of the river can effectively slow down the flow velocity of water by arranging the first anti-scouring structure 10 with the grouted block stone layer 6 at the top. After the water flow passes through the first scour prevention structure 10, the flow speed is still larger, and the rest water pressure needs to be counteracted by the stones of the gabion layer 7 at the top of the second scour prevention structure 20, so that the water flow speed is further slowed down, and the water flow passing through the gabion layer 7 does not scour and damage the river base.
The scour prevention structure for the river channel large drop area has the following characteristics:
1) The materials such as clay, fine soil, composite geomembranes and the like are adopted at the bottoms of the riverways at the two ends to serve as an anti-seepage structure, so that an anti-seepage effect is effectively achieved, and water can be effectively stored.
2) The top of the scour prevention structure adopts the slurry block stone layer and the gabion stone layer respectively, has good stability and long service life, can effectively resist the hydraulic scour, and avoids the influence of the hydraulic damage on the river structure on the flood discharge function.
3) The scour prevention structure of the utility model can be obtained locally, has low cost, simple process and convenient construction.
The above embodiments are provided for illustrating the present utility model and not for limiting the present utility model, and various changes and modifications may be made by one skilled in the relevant art without departing from the spirit and scope of the present utility model, and thus all equivalent technical solutions should be defined by the claims.
Claims (5)
1. An anti-scouring structure for a large drop zone of a river course comprises a first anti-scouring structure and a second anti-scouring structure, and is characterized in that,
the first scour prevention structure is constructed at the position of a low river bed and comprises a coarse sand cushion layer, a composite geomembrane, a fine soil cushion layer, geotextile and a slurry block stone layer which are sequentially arranged from bottom to top; the bottom of the upstream end of the first anti-scouring structure is provided with an anti-seepage structure; the seepage-proofing structure comprises an upstream clay layer, a composite geomembrane, a fine soil cushion layer, geotextile and a slurry block stone layer which are sequentially arranged from bottom to top; the bottom surface of the upstream clay layer is lower than the river bed surface, the upstream end surface and the downstream end surface of the upstream clay layer are vertical surfaces, and the top surface of the upstream clay layer is a first rear flat top surface, a first inclined top surface and a first front flat top surface with the same elevation as that of the coarse sand cushion layer of the first anti-scouring structure, wherein the elevation of the first rear flat top surface, the first inclined top surface and the elevation of the coarse sand cushion layer of the first anti-scouring structure are lower than that of the river bed surface from upstream to downstream;
the second scour prevention structure is connected to the downstream end of the first scour prevention structure, the downstream end face of the second scour prevention structure is a vertical face, and the second scour prevention structure comprises a downstream clay layer, a composite geomembrane, a fine-grained soil cushion layer, geotechnical cloth and gabion layers which are sequentially arranged from bottom to top; the bottom surface of the downstream clay layer is lower than the river bed surface, the elevation of the bottom surface is the same as that of the bottom surface of the upstream clay layer, the upstream end surface of the downstream clay layer is an inclined surface, the downstream end surface of the downstream clay layer is a vertical surface, and the top surface of the downstream clay layer is sequentially a second rear flat top surface, a second inclined top surface and a second front flat top surface, wherein the elevation of the second rear flat top surface is the same as that of the coarse sand cushion layer of the first anti-scouring structure, the elevation of the second front flat top surface is lower than that of the river bed surface, and the elevation of the second front flat top surface is the same as that of the first front flat top surface of the upstream clay layer;
the elevation of the first scour prevention structure is the same as the elevation of the second scour prevention structure.
2. The scour protection structure for a large drop zone of a river according to claim 1, wherein the thickness of the upstream clay layer and the thickness of the downstream clay layer are both 0.8-1.5 m, and the compactness is not less than 0.97; the length of the upstream clay layer is 2m; the length of the downstream clay layer is 7m; the slope ratio of the first inclined top surface of the upstream clay layer, the slope ratio of the upstream end surface of the downstream clay layer and the slope ratio of the second inclined top surface of the downstream clay layer are all 1:1.
3. the scour protection for large drop zones of a river according to claim 1, wherein the thickness of the coarse sand bedding layer is 9-11 cm; the thickness of the fine-grained soil cushion layer is 25-35 cm; the thickness of the slurry block stone layer of the first scour prevention structure is 50cm; the thickness of the gabion layer is 1m.
4. The scour prevention structure for a large drop area of a river course according to claim 1 or 3, wherein the fineness modulus of the coarse sand cushion layer is 3.6-3.2, and coarse sand with a mud content of less than or equal to 5% is paved.
5. The scour protection for large drop zone of river according to claim 1 or 3, wherein the fine-grained soil cushion layer is paved with fine-grained soil with grain diameter less than or equal to 4cm, and the compactness of the fine-grained soil cushion layer is more than or equal to 0.97.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320331994.XU CN219862610U (en) | 2023-02-27 | 2023-02-27 | Scour prevention structure for large drop zone of river channel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320331994.XU CN219862610U (en) | 2023-02-27 | 2023-02-27 | Scour prevention structure for large drop zone of river channel |
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| Publication Number | Publication Date |
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| CN219862610U true CN219862610U (en) | 2023-10-20 |
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| CN202320331994.XU Active CN219862610U (en) | 2023-02-27 | 2023-02-27 | Scour prevention structure for large drop zone of river channel |
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