CN218562252U - Cofferdam structure suitable for strong tidal bore area - Google Patents
Cofferdam structure suitable for strong tidal bore area Download PDFInfo
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- CN218562252U CN218562252U CN202222222854.7U CN202222222854U CN218562252U CN 218562252 U CN218562252 U CN 218562252U CN 202222222854 U CN202222222854 U CN 202222222854U CN 218562252 U CN218562252 U CN 218562252U
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Abstract
The utility model discloses a cofferdam structure suitable for strong tidal bore area, including accumulational weir heart dredger fill of coastal pond dyke foot and geotechnological tube bag cofferdam, the both sides and the top of weir heart dredger fill are located to geotechnological tube bag cofferdam, and geotechnological cloth has been laid in the outside of weir heart dredger fill, and the bottom of weir heart dredger fill is equipped with the heart geotechnological tube bag of weir, and the width of the heart geotechnological tube bag of weir is less than the width of the heart dredger fill of weir and locates the side of being close to the river of weir heart dredger fill. The utility model discloses can improve the stability of stabilizing seepage flow period and water level collapse period when not increasing cofferdam design size, reduce the engineering volume and the construction degree of difficulty, reduce engineering cost.
Description
Technical Field
The utility model belongs to the technical field of the reinforcement of pond dyke foot, especially, relate to a cofferdam structure suitable for strong tidal bore area.
Background
The hydrodynamic condition of the estuary sea pond strong tidal bore area is strong, the river channel is washed, the siltation is strong, the width of the beach outside the sea pond is different, and the elevation of the beach is changed continuously; similarly, the dike feet of the pond are severely washed by tide water, and the stability of the dike feet becomes a great hidden trouble, so that the dike feet of the estuary sea pond are always required to be periodically detected and reinforced.
The reinforcement construction of the sea pond dyke foot is greatly interfered by hydrodynamic conditions and is limited by the flood season, so that the selection of the construction method becomes a main factor influencing the construction period and the construction safety. The existing mature method for reinforcing the dike foot of the sea pond comprises construction of a wet-waiting access way under the pond, construction of a steel trestle, dry construction of a cofferdam and the like. The construction method of the steel trestle belongs to the field of edge overhead operation, the potential safety hazard problem is prominent, and the manufacturing cost is high; the construction method for waiting tide of the toilet under the pond is a construction method for man-machine withdrawal during rising tide and man-machine heavy earth during falling tide, has low work efficiency and is suitable for local small-amount embankment foot repairing engineering;
the construction method of the geotextile tube bag hydraulic fill cofferdam originates from 1995, the cofferdam is formed by stacking geotextile tube bags, the investment and seepage prevention are considered, the geotextile tube bags are not used in the center of the dam, the whole area of the center of the dam is hydraulic fill, and the center of the dam generally accounts for 23-32% of the total volume of the main dam. The geotechnical tube bag cofferdam accounts for a great proportion in the total price of the sea pond engineering, and can reach 77-80% of the temporary engineering price. The construction method is mature, high in construction efficiency and dry in land operation, and facilitates the inspection of the current situation that the dike feet are washed.
The strong tidal bore area is influenced by complicated hydrodynamic force condition, and the beach elevation outside the pond embankment foot constantly changes, and when the beach elevation reduces, in order to satisfy the scour protection and the prevention of seepage requirement of cofferdam, the cofferdam design size needs corresponding increase, need increase the packway and put the slope progression even when cofferdam size design increases, cofferdam engineering volume greatly increased and area greatly increased, this makes the construction degree of difficulty increase and engineering cost increase.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the above-mentioned technical problem that exists among the prior art, provide a cofferdam structure suitable for strong tidal bore area, can improve the stability in stable seepage flow phase and the abrupt stage of water level when not increasing cofferdam design size, reduce the engineering volume and the construction degree of difficulty, reduce engineering cost.
In order to solve the technical problem, the utility model discloses a following technical scheme:
the utility model provides a cofferdam structure suitable for strong tidal bore area, includes coastal pond dyke foot accumulational weir heart dredger fill and geotechnological tube bag cofferdam, and both sides and top of weir heart dredger fill are located to geotechnological tube bag cofferdam, its characterized in that: geotechnical cloth is laid on the outer side of the weir core dredger fill, a weir core soil engineering pipe bag is arranged at the bottom of the weir core dredger fill, and the width of the weir core soil engineering pipe bag is smaller than that of the weir core dredger fill and is arranged on the side, close to the river, of the weir core dredger fill. Through the dam core dredger fill and the geotechnical tube bag cofferdam arranged outside the dam core dredger fill, the stability of the seepage stabilization period and the water level collapse period can be improved. The geotextile can effectively prevent the dredger fill loss of the weir core dredger fill. Thereby set up the less weir heart geotechnique's tube bag of width through the bottom of weir heart dredger fill and be used for strengthening the overall stability of cofferdam under water level slump operating mode and stable seepage flow operating mode with reserving out the impervious core. The elevation of the beach outside the dike feet of the sea pond is changed continuously under the influence of complex hydrodynamic conditions in the strong tidal bore area, and the elevation of the beach which is changed continuously can be dealt with by the cofferdam structure, so that the dike feet are prevented from being washed away, the stability of the cofferdam structure is improved, and the dike feet do not need to be periodically detected and reinforced.
Further, the geotechnical tube bag cofferdam is provided with a positioning frame for positioning the geotechnical tube bag cofferdam. Through the setting of locating rack, can play the positioning action when the construction of geotechnological tube bag cofferdam, make things convenient for the pile of geotechnological tube bag, after the cofferdam is built, can play certain supporting role simultaneously, improve the antiscour ability of geotechnological tube bag cofferdam.
Further, the bottom of the positioning frame is buried in the beach ground layer for fixing. The locating rack is partially embedded into the stratum, so that the locating rack is more stable and is not easy to shake.
Further, a ballast slope is arranged on the side of the foundation pit of the earthwork tube bag cofferdam. The ballast slope is used for preventing seepage and enhancing the overall stability of the cofferdam, and meanwhile, the platform part of the ballast slope can be used as a construction access road, so that construction is facilitated.
Furthermore, the side of the geotechnical pipe bags facing the river is provided with an anti-impact slope, and the anti-impact slope is formed by stacking a plurality of anti-impact geotechnical pipe bags. The scour of complex hydrodynamic force can be resisted through the scour prevention slope on the side facing the river.
The utility model discloses owing to adopted above-mentioned technical scheme, following beneficial effect has:
the utility model discloses a setting of weir heart dredger fill and weir heart bottom geotechnological tube bag cofferdam can improve the stability of stabilizing seepage flow phase and water level collapse phase in the time of not increasing cofferdam design size, has the stability height, saves cost, area little and the characteristics of being convenient for construct, and the difficult problem of cofferdam design when can solving estuary sea pond and gush tidal zone beach ground elevation constantly change guarantees the anti dashing stability of prevention of seepage of cofferdam.
Drawings
The present invention will be further explained with reference to the accompanying drawings:
fig. 1 is the utility model relates to a cofferdam structure's schematic structure suitable for strong tidal bore area.
In the figure, 1-weir center dredger fill; 2-geotextile tube bag cofferdam; 3-geotextile; 4-weir center earthwork pipe bag; 5-a positioning frame; 6-pressing the slope; 7-preventing a slope from rushing; 8-scour protection geotechnical pipe bags; 9-impervious core wall.
Detailed Description
As shown in fig. 1, for the utility model relates to a cofferdam structure suitable for strong tidal bore area, including accumulational weir heart dredger fill 1 of coastal pond dyke foot and geotechnological tube bag cofferdam 2, the both sides and the top of weir heart dredger fill 1 are located to geotechnological tube bag cofferdam 2, and geotechnological cloth 3 has been laid in the outside of weir heart dredger fill 1, and the bottom of weir heart dredger fill 1 is equipped with weir heart geotechnique's tube bag 4, and the width of weir heart geotechnological tube bag 4 is less than the width of weir heart dredger fill 1 and locates the side of being close to the river of weir heart dredger fill 1. The dam core earth tube bag 4 with smaller width is arranged at the bottom of the dam core dredger fill 1, so that the impervious core wall 9 is reserved to increase the integral impervious capability. Through the dam core dredger fill 1 and the geotechnical tube bag cofferdam 2 arranged outside the dam core dredger fill, the stability of the stable seepage period and the water level collapse period can be improved. The geotextile 3 can effectively prevent the dredger fill loss of the weir core dredger fill 1. And the quantity of the dam core soil engineering pipe bags 4 is set at the bottom of the dam core dredger fill according to the elevation change of the beach land.
The geotextile tube bag cofferdam 2 is provided with a positioning frame 5 for positioning the geotextile tube bag cofferdam 2. Through the setting of locating rack 5, can play the positioning action when geotechnological tube bag cofferdam 2 is under construction, make things convenient for the pile of geotechnological tube bag, after the cofferdam is built, can play certain supporting role simultaneously, improve the antiscour ability of geotechnological tube bag cofferdam 2.
The bottom of the positioning frame 5 is buried in the beach ground layer for fixing. The positioning frame 5 is partially embedded into the stratum, so that the positioning frame 5 is more stable and is not easy to shake.
And a ballast slope 6 is arranged on the foundation pit side of the geotextile tube bag cofferdam 2. The ballast slope 6 is used for preventing seepage and enhancing the overall stability of the cofferdam, and meanwhile, the platform part of the ballast slope 6 can be used as a construction access road, so that construction is facilitated. The side, close to the river, of the geotextile tube bag cofferdam 2 is provided with an anti-impact slope 7, and the anti-impact slope 7 is formed by stacking a plurality of anti-impact geotextile tube bags 8. The erosion of complex hydrodynamic force can be resisted through the erosion-prevention slope 7 on the side facing the river. The anti-scour geotechnical pipe bag 8 slope setting of 7 front ends on scour protection slope, the anti-scour geotechnical pipe bag 8 leans on river one end downward sloping to make the anterior of anti-scour geotechnical pipe bag 8 bury in the stratum, play certain water conservancy diversion effect, reduce rivers to the impact of anti-scour geotechnical pipe bag 8.
The geotechnical tube bag cofferdam 2 is characterized in that geotechnical tube bags are made of geotextile woven by 200g/m & lt 2 & gt filaments, the radial breaking strength is larger than or equal to 50kN/m, the latitudinal breaking tensile strength is larger than or equal to 35kN/m, the soil in the geotechnical tube bag cofferdam 2 is sandy silt, the upper layer and the lower layer and the adjacent tube bags are arranged in a staggered mode, and through seams are not allowed. And the earthwork tube bag cofferdam 2 is positioned by a positioning frame 5 during construction. The geotextile 3 adopts 400g/m < 2 > filament non-woven geotextile, and the breaking strength is 15kN/m. Clay is adopted as the weir core dredger fill 1 in the geotextile 3, layered dredger fill is required, a period of time is required to be arranged after each layer of dredger fill is finished, and the next layer of dredger fill is required to be carried out after the initial drainage consolidation of the dredger fill. The used material of weir heart geotechnical pipe bag 4 is with geotechnological pipe bag cofferdam 2, and weir heart geotechnological pipe bag 4 need set up in the weir heart bottom, can increase and decrease the quantity of weir heart geotechnological pipe bag 4 according to the change of beach ground elevation, and the width of weir heart geotechnological pipe bag 4 should be less than the width of weir heart to guarantee cofferdam overall stability and seepage flow stability. Scour protection geotechnique's pipe bag 8 sets up 3 layers, and every layer of geotechnique's pipe bag overlap joint length 10m, extension length 10m for prevent the erodeing of complicated hydrodynamic force condition. The width of a dredger fill ballasting slope 6 platform is 6m, the height of the dredger fill ballasting slope is 5m, clay dredger fill is adopted for seepage prevention, and meanwhile, a ballast layer platform can be used as a construction access way.
The above is only a specific embodiment of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions or modifications made on the basis of the present invention to solve the same technical problems and achieve the same technical effects are all covered by the protection scope of the present invention.
Claims (6)
1. A cofferdam structure suitable for strong tidal bore area, includes accumulational weir heart dredger fill of coastal pond dyke foot and geotechnological tube bag cofferdam, the geotechnological tube bag cofferdam is located the both sides and the top of weir heart dredger fill, its characterized in that: geotechnical cloth has been laid in the outside of weir heart dredger fill, the bottom of weir heart dredger fill is equipped with weir heart geotechnique's pipe bag, the width of weir heart geotechnique's pipe bag is less than the width of weir heart dredger fill is located the river side of being close to of weir heart dredger fill.
2. The cofferdam structure for strong tidal bore area according to claim 1, wherein: the geotechnical pipe bag cofferdam is provided with a positioning frame for positioning the geotechnical pipe bag cofferdam.
3. The cofferdam structure for strong tidal bore area according to claim 2, wherein: the bottom of the positioning frame is buried in the beach ground layer for fixing.
4. The cofferdam structure for strong tidal bore area according to claim 1, wherein: and a ballast slope is arranged on the side of the foundation pit of the geotextile tube bag cofferdam.
5. The cofferdam structure for strong tidal bore area according to claim 1, wherein: the side of the geotechnical pipe bag cofferdam facing the river is provided with an anti-impact slope, and the anti-impact slope is formed by stacking a plurality of anti-impact geotechnical pipe bags.
6. The cofferdam structure of claim 5, wherein the cofferdam structure is applied to strong tidal bore area, and is characterized in that: the scour protection geotechnical pipe bag of scour protection slope front end the slope sets up, scour protection geotechnical pipe bag leans on river one end downward sloping.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222222854.7U CN218562252U (en) | 2022-08-22 | 2022-08-22 | Cofferdam structure suitable for strong tidal bore area |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222222854.7U CN218562252U (en) | 2022-08-22 | 2022-08-22 | Cofferdam structure suitable for strong tidal bore area |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218562252U true CN218562252U (en) | 2023-03-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222222854.7U Active CN218562252U (en) | 2022-08-22 | 2022-08-22 | Cofferdam structure suitable for strong tidal bore area |
Country Status (1)
| Country | Link |
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| CN (1) | CN218562252U (en) |
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2022
- 2022-08-22 CN CN202222222854.7U patent/CN218562252U/en active Active
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