CN115198809A - Repair structure of scoured pit and construction method for repairing scoured pit - Google Patents
Repair structure of scoured pit and construction method for repairing scoured pit Download PDFInfo
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- CN115198809A CN115198809A CN202210965588.9A CN202210965588A CN115198809A CN 115198809 A CN115198809 A CN 115198809A CN 202210965588 A CN202210965588 A CN 202210965588A CN 115198809 A CN115198809 A CN 115198809A
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- 238000010276 construction Methods 0.000 title claims abstract description 27
- 230000008439 repair process Effects 0.000 title claims abstract description 23
- 239000000945 filler Substances 0.000 claims abstract description 54
- 238000009991 scouring Methods 0.000 claims description 40
- 238000011010 flushing procedure Methods 0.000 claims description 16
- -1 polyethylene Polymers 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 239000004698 Polyethylene Substances 0.000 claims description 6
- 239000004743 Polypropylene Substances 0.000 claims description 6
- 229920000573 polyethylene Polymers 0.000 claims description 6
- 239000002861 polymer material Substances 0.000 claims description 6
- 229920001155 polypropylene Polymers 0.000 claims description 6
- 239000011435 rock Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 2
- 230000003628 erosive effect Effects 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 23
- 239000004575 stone Substances 0.000 description 17
- 239000004576 sand Substances 0.000 description 13
- 230000009471 action Effects 0.000 description 8
- 230000001788 irregular Effects 0.000 description 6
- 230000009467 reduction Effects 0.000 description 6
- 239000011148 porous material Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000010410 layer Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000004746 geotextile Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000011664 nicotinic acid Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/06—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against corrosion by soil or water
-
- 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
- E02B3/02—Stream regulation, e.g. breaking up subaqueous rock, cleaning the beds of waterways, directing the water flow
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B8/00—Details of barrages or weirs ; Energy dissipating devices carried by lock or dry-dock gates
- E02B8/06—Spillways; Devices for dissipation of energy, e.g. for reducing eddies also for lock or dry-dock gates
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/10—Placing gravel or light material under water inasmuch as not provided for elsewhere
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/52—Submerged foundations, i.e. submerged in open water
- E02D27/525—Submerged foundations, i.e. submerged in open water using elements penetrating the underwater ground
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Ocean & Marine Engineering (AREA)
- Revetment (AREA)
Abstract
The invention provides a repair structure of a scoured pit and a repair construction method of the scoured pit. The construction can adopt a ship throwing mode, and the self weight of the flexible silk type filler with the built-in counterweight body is utilized to settle in the scour pit. The invention has the advantages of simple structure, convenient construction, good restoration and protection effects, ecology, environmental protection and easy popularization.
Description
Technical Field
The invention relates to the field of underwater structure scour prevention, in particular to a scour pit repairing structure and a scour pit repairing construction method.
Background
Scouring is a common problem in a plurality of engineering fields such as ocean, water transportation, water conservancy, bridges and the like, the existence of underwater structures obviously changes the flow field state of the original water area, strong water flow or high-speed rotating vortex is often generated around the buildings, so that strong scouring capability is generated, and obvious local scouring pits are formed around the structures. Taking the form of a pier foundation on the sea as an example, the existing test and research results show that under the action of natural conditions such as waves, water flow and the like, a downflow and a horseshoe-shaped vortex are formed on the water facing side of a pile along the flow direction of the water flow, the streamline on two sides of the pile contracts, a wake vortex appears on the back water side of the pile foundation and is possibly dispersed and fallen along with the vortex, a complex and variable three-dimensional flow state is formed, the flow state of the water flow is extremely disordered, the shearing capacity and the sediment transport capacity of the water flow to a bed surface are greatly enhanced by the vortex in front of the pile and the contracted streamline on the pile side, part of sediment is carried by the continuous falling of the wake vortex and is transported to the downstream, and finally, an obvious local scouring pit is formed around a structure. The formation of scour pits will result in a reduction in the load-bearing capacity of the structural foundation, which may seriously result in overall structural instability: for example, in bridge engineering, most of the destroyed bridges are caused by the reduction of the burying depth of the bridge piers due to the local scouring of the bridge pier foundation; for another example, offshore wind power plants built in China basically have scouring phenomena of different degrees in recent years, the maximum scouring depth of a pile foundation is far beyond the designed scouring depth, and the safety of a fan is seriously threatened. Taking silty coast of Jiangsu coastal as an example, the scouring phenomenon of the offshore wind power structure of a single pile foundation is common, the scouring depth of the foundation of a single wind power foundation of part of projects exceeds 10 meters, the scouring range reaches 50 meters, the bearing capacity of the pile foundation structure is obviously reduced, and the potential safety hazard of the projects is increased.
In order to ensure the engineering safety, the structure needs to be scoured and repaired. At present, the conventional mode mainly adopts a mode of backfilling block stones or sand to fill and recover the scour pit, and special anti-scour measures such as bottom protection block stones, soft body rows and the like are arranged on the scour pit. According to different forms of structures, forms and sizes of scouring pits at the periphery of the structures are different, peripheral flow field conditions are complex and severe, the scouring pits are difficult to repair, and the traditional repairing mode has more problems:
the sand particles are tiny, and under the action of water flow, the loose particle form cannot be backfilled and positioned, and construction sinking is generally needed after bagging. The throwing of sand in bags is also difficult to implement, if throw the packing at random and lead to arranging in disorder between the sand bag, it is great to produce the hole easily between sand bag and the hole wall, wash out for rivers provides the passageway, can't form better protection to foundation soil, cause the secondary to wash out easily, the layering rule is built and can reduce the hole, receive near the whirlpool rivers influence boats and ships equipment of washing out near the hole and be difficult for being close to and wash out the hole, difficult location, the layering rule is built and build the realization under water, also difficult adaptation various irregular washing out hole forms. The block stone backfilling can be used for relieving the construction difficulty of the bagged sand, but under the action of water flow, the block stones are different in size, the discrete materials are easy to run off or deviate from the position of the flushing pit in the process of throwing and filling, and the ship machine is difficult to position, so that the non-flushing area around the flushing pit is prone to scattering more backfilling block stones, on one hand, the backfilling engineering quantity is greatly increased, on the other hand, the surrounding flow field forms of the block stones which are higher than the original mud surface and scattered around the pit can be continuously changed to form new flushing, and the flushing range is continuously enlarged. The backfill engineering quantity of the sand and stone fillers is large, the cost of the repair scheme is high, and the development modes of sand and stone materials such as mountain digging, sand digging and the like can also generate adverse influence on the environment. In some cases, anti-scouring measures such as bottom protection block stones, geotextiles or soft body rows with certain grading and layering are paved on the surface of the filler according to the calculation condition, so that the additional manufacturing cost is increased, and the construction process of the whole repair scheme is more complicated.
In the face of the above situation, a novel mode is urgently needed to be searched in the process of repairing the flushing pit, and the problems existing in the traditional flushing pit repairing mode are solved.
Disclosure of Invention
The invention aims to provide a repair structure of a scoured pit and a construction method for repairing the scoured pit, and overcomes the defects in the prior art.
In order to solve the technical problems, the invention adopts the technical scheme that: the utility model provides a repair structure of scouring pit, includes a plurality of flexible silk type fillers that will scour the pit and fill up, attach the counter weight body in the flexible silk type filler, the counter weight body wrap up in the flexible silk type filler, the flexible silk type filler is the random silk form entity that has compressibility.
Optionally, the flexible silk filler is made of a high polymer material.
Optionally, the polymer material is polyethylene or polypropylene, or a mixture of the foregoing materials.
Optionally, the device further comprises a flattening body pressed on the flexible silk type filler.
Optionally, the leveling body is a rock block or a concrete block.
Optionally, the counterweight body may be a single block or a single stone block, or may be a soft row of block bodies formed by connecting the single blocks in series.
The construction method for repairing the scoured pit by adopting the repair structure of the scoured pit adopts a ship throwing mode, throws the flexible silk type filler layer by layer for multiple times, and settles into the scoured pit by utilizing the self weight of the flexible silk type filler internally attached with the counterweight body until the scoured pit is filled.
According to the construction method for repairing the scoured pit by adopting the repair structure of the scoured pit, a plurality of flexible silk fillers are connected in series or in parallel by using a rope, the rope is dragged by a ship, and the flexible silk fillers are laid in the scoured pit in layers until the scoured pit is filled.
Optionally, individual said flexible silk type fillings are wrapped with a mesh string.
Optionally, after the flushing pit is filled, the surface of the area protruding too high from the flushing pit is properly leveled by the leveling body.
The invention has the advantages and positive effects that: the method comprises the steps of extruding or drawing high polymer materials such as polyethylene or polypropylene into filaments at high temperature, forming large-volume flexible random filament type fillers after the processes of hot melting, compression, agglomeration and the like, filling and sinking to a scouring pit after being supplemented with a balance weight, and properly arranging a leveling body on the surface of an area protruding over-height to level after the pit is filled, so as to finally realize the repair and protection of the scouring pit at the periphery of the structure. The disorder shape of the flexible silk type filler forms a porous structure, has the functions of energy dissipation, flow reduction and silt promotion, improves the flow field environment, effectively protects the foundation of a structure, and provides living space for benthos. The flexible silk type filler is a flexible structure with compressibility, the overall dimension can be flexibly adjusted, the filler is compressed and compacted under the action of the pressure of the counterweight, and the filler is tightly attached to the shapes of the scouring pit wall and the structure, so that the filler is suitable for various irregular scouring pit shapes and scouring pit dimensions. High-molecular polymer materials such as polyethylene or polypropylene are not easy to corrode, have good durability and low cost, and can be used as wastes. Compared with the traditional sand and stone scouring pit repairing mode, the flexible silk type filler has the function of flow reduction protection, the surface layer of the flexible silk type filler does not need extra anti-scouring measures such as a soft row, the flexible silk type filler is large in size, can guarantee self stability under the action of an attached counterweight body, the throwing and filling construction procedures are greatly reduced, the filler loss and secondary scouring in the construction period can be avoided, the construction is more convenient, the using amount of sand, stone and other materials which need to be driven on a large scale is greatly reduced, the construction cost is reduced, and the ecological environment is protected.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
in the figure: 1-flexible silk type fillers; 2-a counterweight body; 3-ballast.
Detailed Description
The present invention will be described in further detail with reference to specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention. In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, and the two components can be communicated with each other. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
As shown in fig. 1, the present invention provides a repair structure for a scoured pit, which includes a plurality of flexible filament fillers 1 filling the scoured pit, wherein the flexible filament fillers 1 can be made of polyethylene or polypropylene, and are formed into filaments by extrusion or drawing at high temperature, and the filaments are hot-melted, compressed, and agglomerated to form a messy filament-type large-volume solid with certain compressibility. Irregular pores are formed in the entity, water flows into the entity through the pores, under the action of disorder wire obstruction, complex flow states such as contraction, streaming and vortex are generated along the disordered and irregular pores, and the energy reduction of the water flow in the pores is realized like the water flow flowing into the field with the weeds growing in the field and the thorns densely distributed, so that the flow speed of the water flow is reduced, the foundation around the structure is protected from further scouring, the sedimentation of suspended silt particles in water is promoted, the underwater flow field environment is improved, the bionic effect is formed, a friendly living space is provided for marine benthos, and the ecological benefit is good; because the anti-scouring device has the functions of flow reduction and anti-scouring, compared with a stone filler, the anti-scouring device can further avoid secondary scouring of a foundation in construction;
in order to increase the self weight, a counterweight body 2 is additionally arranged in the flexible silk type filler 1, and the counterweight body 2 is wrapped in the flexible silk type filler 1. The flexible silk type filler 1 has self-stability under the action of water flow, is prevented from floating and being taken away by the water flow, has certain strength, can resist the impact force of the water flow, and is prevented from being broken. Compare traditional sand, stone filler repair methods, because flexible silk type filler 1 self possesses stable and scour protection function, the scour protection measure can no longer be laid after the completion is restoreed in the filling of scour protection hole, has reduced engineering cost, has reduced construction process. Certainly, under the condition of severe water flow, the surface layer of the filler can be attached with an anti-scouring measure to jointly protect the structure foundation, and the anti-scouring capability of the repair scheme is further enhanced.
The surface of the flexible silk type filler 1 is paved with a ballast body 3 formed by rock blocks or concrete blocks.
Under the pressure action of the internal counterweight body 2, the pores between the flexible silk filler 1 and the wall of the scouring pit are compressed and compacted, so that the flexible silk filler 1 is in close contact with the wall of the scouring pit, and the scouring pit can adapt to various irregular scouring pit forms. Compared with the block stone, the flexible silk type filler 1 has larger volume, and when the flushing pit is filled and repaired, the throwing and filling times are far less than that of the filling with the block stone, so that the construction steps are greatly simplified, and the modification efficiency is improved. In addition, the shape of the large-volume flexible silk filler 1 is irregular, the external dimension can be flexibly adjusted, and the size of the flushing pit can adapt to different sizes. Compared with the traditional sand and stone filler repairing mode, the invention has more advantages in the face of scouring pits and buildings with individual shapes and different sizes.
The counterweight body 2 can be a single body of a block body or a rock block, and can also be a soft block row formed by connecting the single bodies in series.
The repair construction mode of the scour pit is as follows: the construction can adopt ship throwing, and under the effect of the counterweight body 2, the large-volume flexible silk type filler 1 can sink into the scouring pit by itself, and the self stability of the filler under the effect of water flow is ensured.
Under the conditions that construction conditions are severe and the operation is not good when the flexible silk type filler 1 is thrown and thrown independently, a net rope can be wrapped around the flexible silk type filler 1, so that the integrity of the single flexible silk type filler 1 is better and the single flexible silk type filler 1 is not easy to scatter, the flexible silk type filler 1 is dragged and taken into a pit by the rope, and the throwing and filling positioning accuracy is ensured. In the construction, layered and repeated throwing filling can be adopted, and a plurality of flexible silk fillers 1 can be connected in series and in parallel by using ropes to be laid and arranged.
The embodiments of the present invention have been described in detail, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (10)
1. The utility model provides a repair structure of scouring pit which characterized in that: the flexible silk type filling material filling method comprises a plurality of flexible silk type filling materials for filling a scouring pit, wherein a counterweight body is attached to each flexible silk type filling material, the counterweight body is wrapped in each flexible silk type filling material, and each flexible silk type filling material is a random silk-shaped entity with compressibility.
2. A repair structure for a scour pit according to claim 1, wherein: the flexible silk type filler is made of high polymer materials.
3. A repair structure for a flush pit according to claim 2, wherein: the high polymer material is polyethylene or polypropylene and a mixture of the polyethylene or the polypropylene.
4. A repair structure of a flush pit according to any one of claims 1 to 3, wherein: also comprises a flattening body pressed on the flexible silk type filler.
5. Repair structure for scoured pits according to claim 4, characterized in that: the leveling body is a rock block or a concrete block.
6. A repair structure for a scour pit according to claim 3, wherein: the counterweight body can be a single body of a block body or a rock block, and can also be a soft block row formed by serially connecting the single bodies.
7. A construction method for repairing a scoured pit using the repair structure for a scoured pit according to any one of claims 1 to 6, characterized by: and throwing a plurality of flexible wire type fillers in a ship throwing mode in a layered and repeated mode, and settling the flexible wire type fillers into the flushing pit by utilizing the self weight of the flexible wire type fillers internally attached with the counterweight body until the flushing pit is filled.
8. A construction method for repairing a scoured pit using the structure for repairing a scoured pit as claimed in claim 7, wherein: and connecting a plurality of flexible silk fillers in series or in parallel by using a rope, dragging the rope by using a ship, and paving the flexible silk fillers in the scouring pit in layers until the scouring pit is filled.
9. The construction method for repairing a flushing pit according to claim 8, characterized in that: the individual flexible silk type fillings are wrapped with a mesh rope.
10. The construction method for erosion pit restoration according to any one of claims 7 to 9, characterized by: after the flushing pit is filled, the surface of the area protruding too high from the flushing pit is properly leveled by the leveling body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210965588.9A CN115198809B (en) | 2022-08-12 | 2022-08-12 | Repair structure of flushing pit and construction method for repairing flushing pit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210965588.9A CN115198809B (en) | 2022-08-12 | 2022-08-12 | Repair structure of flushing pit and construction method for repairing flushing pit |
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| Publication Number | Publication Date |
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| CN115198809A true CN115198809A (en) | 2022-10-18 |
| CN115198809B CN115198809B (en) | 2024-03-15 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101892673A (en) * | 2010-07-01 | 2010-11-24 | 宝钢工程技术集团有限公司 | Erosion protection processing method for offshore wind turbine foundation |
| CN102297289A (en) * | 2011-08-08 | 2011-12-28 | 胜利油田龙玺石油工程服务有限责任公司 | Method for treating suspension of submarine pipeline by covering of bionic aquatic weeds |
| CA2898649A1 (en) * | 2013-02-18 | 2014-08-21 | Swan Net-Gundry Limited | A scour remediation and mitigation apparatus |
| CN205822279U (en) * | 2016-07-25 | 2016-12-21 | 福建永福电力设计股份有限公司 | A kind of marine structure anti-scouring system |
| CN208219676U (en) * | 2018-04-09 | 2018-12-11 | 北京华夏绿洲生态环境工程有限公司 | A kind of ecological slope protection structure |
| CN215052630U (en) * | 2021-02-05 | 2021-12-07 | 新乡黄河河务局原阳黄河河务局 | Lead wire mesh and geotextile composite earth-rock overlong pillow root fixing structure for yellow river emergency |
-
2022
- 2022-08-12 CN CN202210965588.9A patent/CN115198809B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101892673A (en) * | 2010-07-01 | 2010-11-24 | 宝钢工程技术集团有限公司 | Erosion protection processing method for offshore wind turbine foundation |
| CN102297289A (en) * | 2011-08-08 | 2011-12-28 | 胜利油田龙玺石油工程服务有限责任公司 | Method for treating suspension of submarine pipeline by covering of bionic aquatic weeds |
| CA2898649A1 (en) * | 2013-02-18 | 2014-08-21 | Swan Net-Gundry Limited | A scour remediation and mitigation apparatus |
| CN205822279U (en) * | 2016-07-25 | 2016-12-21 | 福建永福电力设计股份有限公司 | A kind of marine structure anti-scouring system |
| CN208219676U (en) * | 2018-04-09 | 2018-12-11 | 北京华夏绿洲生态环境工程有限公司 | A kind of ecological slope protection structure |
| CN215052630U (en) * | 2021-02-05 | 2021-12-07 | 新乡黄河河务局原阳黄河河务局 | Lead wire mesh and geotextile composite earth-rock overlong pillow root fixing structure for yellow river emergency |
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| CN115198809B (en) | 2024-03-15 |
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