CN212248062U - Antifouling curtain suitable for river and lake environment-friendly dredging engineering - Google Patents
Antifouling curtain suitable for river and lake environment-friendly dredging engineering Download PDFInfo
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- CN212248062U CN212248062U CN201921384355.XU CN201921384355U CN212248062U CN 212248062 U CN212248062 U CN 212248062U CN 201921384355 U CN201921384355 U CN 201921384355U CN 212248062 U CN212248062 U CN 212248062U
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Abstract
The invention discloses an antifouling curtain suitable for river and lake environment-friendly dredging engineering, and aims to solve the problem that suspended matters generated in dredging operation are diffused outwards to cause serious environmental pollution and harm. The structure of the antifouling curtain comprises four parts, namely a malleable accessory, an antifouling curtain main body, a functional structure adsorption main body and a fixed rod. The malleable fittings included PE floats, down-links. The curtain is installed and fixed through the double-layer fixed cloth buttons at the upper end and the lower end of the curtain. The main body of the anti-fouling curtain is a high-precision non-woven fiber filtering material which is developed aiming at the river and lake environment and has a composite structure of a surface fiber web and a bottom layer fiber web, and the anti-fouling curtain is arranged along the square of a dredging area. The functional structure adsorption main body is made of activated carbon. The fixing rod is made of bamboo or iron rods according to the water depth and the flow speed. The invention develops an anti-fouling curtain suitable for the environment-friendly dredging engineering of rivers and lakes aiming at the environmental characteristics of the rivers and lakes, provides a layout method, and provides an effective anti-diffusion device for the dredging process of environment-friendly dredging sediment.
Description
Technical Field
The utility model belongs to the technical field of the engineering environmental protection is dredged, concretely relates to antifouling curtain suitable for engineering is dredged in river lake environmental protection.
Background
In recent years, the rapid economic growth and the interference of human activities accelerate the transportation of pollutants to rivers, lakes and reservoirs, so that the problem of environmental pollution of the water in the rivers, lakes and reservoirs is more and more serious, and the phenomena of water eutrophication, black and odorous water and the like are specifically shown. Research and practice for many years prove that lake and river water body restoration is a systematic and complex comprehensive project, and a systematic and comprehensive treatment mode integrating source control, pollutant interception, ecological restoration and scientific management is required to be adopted. The sources of pollutants in lakes and rivers can be divided into endogenous pollution and exogenous pollution, and the sediment is used as a main accumulation place of the pollutants in the water bodies of the lakes and rivers and is the main endogenous pollution.
Environmental dredging, which is the most direct, effective and rapid important means for removing endogenous sources, is widely applied worldwide at present. China carries out environment-friendly dredging engineering on lakes such as Taihu lake, West lake and Dian lake Erhai with the purposes of improving the water environment of river lake and controlling eutrophication. Most of the dredging projects relieve the pollution condition of water, and effectively improve the water quality and ecological conditions of rivers and lakes
However, in the process of bottom mud dredging construction, the dredging equipment disturbs the polluted bottom mud, and the sludge fine particles in the local water area around the dredging equipment are diffused, so that the pollutants attached to the fine particles are also diffused in the water body, which causes serious secondary pollution. The anti-diffusion technology in the dredging process of the existing dredging engineering is less in application, the anti-pollution curtain is more randomly used (materials and structural forms), the engineering effect is difficult to achieve in the practical engineering application, and the harm phenomena of blue algae deterioration, lake flooding and the like are caused even in a short time by the irregular dredging anti-diffusion technology. The utility model discloses just be based on the anti-diffusion device-antifouling curtain of the process pollutant is dredged to the engineering of dredging suitable for river lake environmental protection of this background under development, its aim at will effectively dredge the short range apart from the protected area, prevent by the outward diffusion of a large amount of suspended solids that the engineering arouses of dredging, reduce the region that is polluted by the engineering of dredging, reach the purpose of standard dredging operation.
SUMMERY OF THE UTILITY MODEL
To the phenomenon of removing and reamer head working process suspended solid on a large scale diffusion by the hull in the dredging engineering, for overcoming the not enough of prior art, the utility model provides an antifouling curtain suitable for engineering is dredged in river lake environmental protection, this antifouling curtain can effectively keep apart dredging district and guard space, and the pollutant of in-process diffusion is dredged in the high-efficient interception to supplementary it sinks. The device is simple and convenient, and the practicability is strong.
The utility model aims to solve the technical problems in the background art, adopts the technical scheme that the antifouling curtain is suitable for the river and lake environment-friendly dredging engineering and consists of four parts, namely a ductile accessory, an antifouling curtain main body, a functional structure adsorption main body and a fixed rod;
the ductile fitting comprises a floating body and an underlying chain; connecting the antifouling curtain main body with the central rod of the floating body through the thickened connecting hole by using a steel wire; the lower chains are uniformly distributed at the bottom end of the curtain and are buckled and connected through a balance weight ring compositely processed at the bottom end, and two ends of the iron chain are connected with the nylon ropes on the thickened connecting holes.
The main body of the anti-fouling curtain is a high-precision non-woven fiber filtering material with a composite structure of an anti-fouling curtain surface fiber web and an anti-fouling curtain bottom layer fiber web.
The functional structure adsorption main body is made of activated carbon.
The floating bodies are connected in groups of 20.
The floating body is made of PE materials, is a cylinder with the size of 20cm in radius and 100cm in length, and is of a novel floating body structure.
The structure of the antifouling curtain comprises four parts, namely a malleable accessory, an antifouling curtain main body, a functional structure adsorption main body and a fixed rod.
The utility model has the advantages that:
1. the utility model discloses an antifouling curtain main part is based on and confirms under river lake environment sediment composition, geometry, the granule distribution analysis prerequisite. Therefore, specific curtains (the fineness of raw materials) can be preferably selected by test analysis aiming at different river and lake environments, and the curtain is suitable for river and lake dredging engineering and has strong pertinence.
2. The screened fiber filtering material (polypropylene) has the advantages of small base material density, moderate strength, excellent elasticity, good wear resistance, extremely small hygroscopicity, chemical corrosion resistance and the like, and has wide application environment and obvious engineering effect.
3. The utility model provides an antifouling curtain is for having the high accuracy non-woven fiber filtering material of the composite construction of top layer fibre web, bottom fibre web. The dual-gradient filtering precision structure with the diameter of 1.75 mu m and the diameter of 6.25 mu m can be widely applied to river and lake dredging engineering, simultaneously creates a good surface layer filtering environment and improves the back washing cleaning performance.
4. The curtain layout form, the balance weight and the like under different environments can be accurately calculated based on a mechanical calculation formula in the river and lake water power comprehensive acting force explanation.
5. The ductility accessory, the antifouling curtain main part, the functional structure flocculation main part and the fixed rod are connected in the form of buckles, rings, ropes, hooks and the like, and meanwhile, each intercepting unit can be flexibly connected end to end according to needs and is convenient to detach. The device is flexible in application and convenient to disassemble and assemble.
Drawings
Fig. 1 is a schematic structural view of the anti-fouling curtain of the present invention.
Fig. 2 is a working condition trash holding principle diagram.
FIG. 3 is a view showing a structure of a double layer of the antifouling curtain a-a cross section of a surface layer of a filter material; b-obtaining a bottom layer section of the filter material; c-schematic of the bilayer structure.
Wherein: 1. antifouling curtain main body, 1-1 antifouling curtain surface fiber web, 1-2 antifouling curtain bottom fiber web, 2 functional structure adsorption main body, 3 floating body, 4 lower chain, 5 joining hole, 6 thickening joining hole, 7 linking rope, 8 counterweight ring, 9 fixing rod, 10 bottom mud, 11 stabilizing layer
The specific implementation mode is as follows:
the present invention will be described in further detail with reference to the following examples and drawings. The embodiments of the present invention are provided to better enable those skilled in the art to better understand the present invention, but do not limit the present invention.
Referring to fig. 1, the structure of the anti-fouling curtain comprises an anti-fouling curtain body 1, a functional structure adsorption body 2, and a malleable fitting composed of a floating body 3, a lower chain 4 and a fixed rod 9. The main body of the antifouling curtain is a high-precision non-woven fiber filtering material which is developed aiming at river and lake environments and has a composite structure of a surface fiber web 1-1 and a bottom fiber web 1-2 of the antifouling curtain, and each independent curtain is connected in series through a connecting hole 5 by a nylon rope according to actual needs and is partially overlapped; the functional structure adsorption main body 2 adopts 53-type sewage treatment activated carbon and is fixed at the bottom (dredging side) of surface layer fiber by geotextile grid needling;
every 20 PE floats 3 are connected in a group, and a 20 m-long antifouling curtain main body 1 is connected with a central rod of the PE float 3 through a thickening connecting hole 6 by using steel wires. The lower chains 4 are uniformly distributed at the bottom end of the curtain and are buckled and connected through a balance weight ring 8 compositely processed at the bottom end, and two ends of the iron chain are connected with nylon ropes on the thickened connecting holes; the fixed rod 9 is vertically inserted into the bottom of a river or lake to be 0.5-1.5m deep, the river or lake environment is stable due to hydrodynamic conditions, a curtain is arranged at a certain distance from a dredger and can be considered as static dredging, and for the river or lake with high fluidity, the fixed rod is fixed at the position of the bottom thickening fixed hole 6 by using an anchor block according to actual conditions.
The extensible fittings comprise PE floating bodies 3 and underlying chains 4, and the extensible fittings are used for keeping the transverse and longitudinal extensibility of the antifouling curtain under the working condition. The body adopts the PE material, and the size is radius 20cm, long 100 cm's cylinder, adopts novel body structure, can both keep sufficient stability under various waters environment, and the buoyancy is stable difficult for losing. The buoyancy of the single floating body is 80kg/m, the single floating bodies are connected in series through the central rod, the integrity and the stability of the single floating body in a water body are ensured, and the buoyancy margin coefficient is 0.3. The lower chain is selected from a cheap and easily-obtained iron chain, the counterweight ring at the bottom of the curtain is connected with the curtain, the uniformity and the ductility of the vertical stress of the curtain are ensured, and the quality of the iron chain is obtained according to the balance of different hydrodynamic conditions.
The main body of the anti-fouling curtain is a high-precision non-woven fiber filter material which is developed aiming at river and lake environments and has a composite structure of a surface fiber web and a bottom layer fiber web, and the anti-fouling curtain has the function of isolating a dredging area from a protection area and preventing suspended matters caused by dredging from further diffusing. And determining the polypropylene fiber as the raw material of the main body of the anti-fouling curtain through the analysis of the working conditions of the river and lake environment and the optimization of the material performance. The fine fibers on the surface layer are compact in cross, small in pore size, compact and uniform in distribution, meet the filtering precision and realize the surface layer filtering effect, and face the water area of the dredging area; the coarse fibers at the bottom layer can form larger aperture and higher porosity, and mainly provide larger filtering flux, reduce filtering resistance, improve the dirt-containing performance of the filtering material and increase the back-washing effect of the material, thereby realizing the recycling of the material and facing the water area of a protected area.
The calculation is carried out by applying the formula (1) of the Simmonds theory to different river and lake environments: dmean-mean pore diameter (μm) of the nonwoven Material, Dmeanf-fiber diameter (μm), -porosity, ρ -fiber density (g/cm3), De-fiber fineness (D), m-web grammage (g/m2), σ -web thickness (mm)
Wherein D ise(fineness of fiber) is of fixed length. m (web gram weight): refers to the weight in grams per square meter of web. (porosity): refers to the percentage of void volume in the web as a whole web volume. From the above formula D can be derivedfAnother expression:
the utility model determines the filtration precision to be two gradients of 1.75 μm and 6.25 μm according to the analysis of the bottom mud components in the river and lake. Designing a non-woven filter material meeting the requirement of a filter gradient, determining a non-woven material with the filter precision of 1.75 mu m, selecting a fiber raw material with the fineness of 0.8-2.5D, the length of 38mm, the percentage of fine/coarse fibers of 60/40, uniformly mixing, opening, uniformly mixing, processing a net, carrying out composite processing according to a designed structure, and finally carrying out surface finish finishing such as heat setting, singeing, calendaring and the like to form a material with a smooth, compact and uniform surface. The filtering material with filtering precision of 6.25 μm is prepared by selecting 1.5-3.5D fiber raw material with fine/coarse fiber percentage of 65/35, opening, mixing, forming web, performing composite processing, and performing surface finishing such as heat setting, singeing and calendaring. Then the two are combined and processed. The production process of the optimized needle-punched non-woven filter material comprises the following steps: the pre-needling depth is 13mm, the main needling depth is 12.1mm, and the pre-needling density is 60 needling/cm2The main needling density is 240 needling/cm2And after-finishing technologies such as heat setting, calendaring, singeing and the like are adopted, the surface layer of the non-woven fiber filtering material is smooth and compact by adopting the after-finishing technology, filtered particles can be accumulated into a filter cake on the filtering material layer, the phenomenon that a large amount of filtering particles enter the filtering material layer to form irreversible accumulation is relieved, and the non-woven fiber filtering material has good surface layer filtering and back washing cleaning performances. A thickening layer of 3cm is reserved at the bottom end of the curtain and used for connecting the counterweight ring 8, and the arrangement mode is square surrounding arrangement or vertical river bank intercepting arrangement.
The functional structure adsorption main body is made of active carbon and has the functions of adsorbing bottom layer diffused suspended matters in the dredging process and suspended matters raised in the contact process of the antifouling curtain main body 1 and the bottom mud 10. The advantages of large adsorption capacity, high adsorption speed, good mechanical strength and the like of the activated carbon are fully utilized to adsorb pollutants and form a barrier at the bottom end of the antifouling curtain, so that suspended matters caused by factors such as untight contact between the antifouling curtain and the bottom of a river or lake and hydrodynamic force stimulation of the bottom curtain are intercepted durably. The 53-type sewage treatment activated carbon is determined and selected, the using amount is 2-5kg/m, the size is 8-30 meshes, and the passing rate of the particle size of 200 meshes is more than or equal to 90%. The breathable cloth is processed into a grid shape (the size of a single grid is 5cm x 5cm), and the breathable cloth and the curtain are processed and knitted together to be fixed at the position of 5cm at the bottom end of the smooth surface (the side of the dredging area) of the curtain, so that the breathable cloth and the curtain form a main body. Is sealed and fixed by the front cloth at the lower edge of the main body of the anti-pollution curtain.
The fixing rod is made of bamboo or iron rod according to the conditions of water depth and flow speed. The function of the device is to fix the position of the curtain and share the main water flow power, so that the device is not damaged by overlarge instantaneous acting force. The diameter of the fixed rod is about 5-15cm, the length of the fixed rod is about 2-5m, the diameter can be properly increased according to hydrodynamic conditions, and the length of the fixed rod is determined according to different water depths. The rope and the steel wire which are born by the square thickening cloth with 3cm x 3cm at the upper end and the lower end of the anti-fouling curtain are connected with the anti-fouling curtain.
The extension accessories, the functional structure flocculation main body and the fixing rod are connected through the locally thickened cloth and the steel wire, and the extensibility and the dirt blocking functionality of the anti-fouling curtain during interception are guaranteed.
The utility model discloses in according to the characteristics of use of antifouling curtain and its application position in the diffusion preventing technology, consider (refer to capital construction projects such as harbour, ocean) in its application process as follows: mechanical influence of water flow and wind on the device is considered; secondly, considering the fixing effect generated by the property of the device, the balance weight and the anchor tension, the layout follows the following mechanical calculation in the practical engineering application, and the corresponding balance weight, the floating body and the like are obtained according to the calculation.
(one) load calculation
(1) W1 lake load: w1 ═ 0.5 × ρw×Cd×Dr×u2×Kc (1)
Where ρ iswWater density; cdA coefficient of drag; drThe height of the curtain; u water flow speed; kcAn equivalent coefficient;
(2) w2 wind load: w2 ═ 0.5 × ρa×Cd×Fr×v2 (2)
Where ρ isaThe density of the air; cdA coefficient of drag; frThe diameter of the floating body; v, wind speed;
(3) w3 water wave load:
W3＝0.5×ρw×Cd×[(π×H/T)×(1/sinh(2×π×h/L))]2×(L/8π)×[sinh(4×π× h/L)-sinh[4×π×(h-Dr×Kc)/L]+4×π×Dr×Kc/L] (3)
wherein: rhowWater density; drThe height of the curtain; h water wave height; a period T; l wavelength; h water depth; kcCoefficient of equivalence
(4) Designing surface load: w ═ W1+W2+W3 (4)
(II) calculation of anchor cable tension
(1)TrAnchor cable tension
Tr＝A×W/cosθ (5)
Wherein, the horizontal inclination angle of the theta anchor cable is; distance A
(2)TaDesigning the tensile force of the anchor cable: t isa＝Tr×SFa (6)
SFaAnchor cable safety factor
(3)LarLength of anchor cable
Lar＝α(h+H/2)/sinθ (7)
Wherein, alpha surplus coefficient; h, water depth; h water wave height; horizontal inclination angle of theta anchor cable
(4)WaAnchor block gravity
Wa＝SFa×[Tr×cosθ/(αK)+Tr×sinθ]×γc/(γc-1) (8)
Wherein, SFaThe safety factor of the anchor cable; theta anchor cable horizontal inclination angle; taking 1.05 as alpha surplus coefficient; k, anchor cable tension coefficient; gamma raycAnchor block specific gravity;
(III) antifouling curtain tension calculation
(1)P1Water flow pressure: p1＝0.5×ρw×Cd×u2×Kc (9)
Where ρ iswWater density; cdA coefficient of drag; u water flow speed; kcThe equivalent coefficient is 0.7
(2)P2Pressure of water wave
P2＝0.5×ρw×Cd×[(π×H/T)×(1/sinh(2×π×h/L))]2×(L/8π)×[sinh(4×π×h/L)- sinh[4×π×(h-1)/L]+4×π/L]
(10)
Where ρ iswWater density; cdA coefficient of drag; h water wave height; t water wave period; l wavelength; depth of h water
(3)TsCurtain tension
Wherein a is 0.5 × Aa; a, anchor block spacing;maxmaximum horizontal deviation; p ═ P1+P2
(IV) buoyancy calculation
F＝Tr×sinθ/A (12)
Theta anchor cable horizontal inclination angle; and (4) spacing A.
The buoyancy of the floating body is calculated according to half of the submerged water body, and whether the buoyancy requirement of the device is met or not is judged.
According to the calculation result, determining the design parameters of each group of unit antifouling curtains by combining with the actual situation of the site as follows: length and width of the anti-fouling curtain; proportioning a floating body; iron chain counterweight, anchor arrangement and the like.
And determining the release position under the guidance of actual engineering requirements, simulation results and the like. When the water body is put in, the fixing rod at one end is fixed firstly, part of the floating body is installed, then the water body is slowly put in with one end of the curtain with the counterweight chain, the fixing rod is installed while the water body is put in, and the bottom end of the antifouling curtain is ensured to contact with rivers and lakes until the arrangement is finished.
Referring to fig. 2, in the environment-friendly dredging process, when a carrier fluid passes through a surface fiber web 1-1 of an antifouling curtain and a bottom fiber web 1-2 of the antifouling curtain from a dredging area, suspended particles carried by the carrier fluid are separated from a carrier fluid streamline under the action of physical factors such as interception, inertial diffusion and sedimentation, and then approach the surface of the surface fiber web 1-1. Under the action of molecular force among substances and physical and chemical adsorption force, suspended particles can be adsorbed on the surface of a filtering material or on the surface of particles forming a filter cake, so that surface layer filtering effect is realized, high concentration is formed near a surface layer fiber web of the antifouling curtain, and because the adhesion degree between the filtering material and the suspended particles is not firm, a part of adhered suspended particles can be peeled off from the surface of the filter cake, and then are brought into a bottom layer fiber web 1-2 by a carrier fluid to be adsorbed and trapped again, so that deep layer filtering effect is realized; when the bottom layer carrier fluid moves to the periphery of the curtain, because the activated carbon wrapped by the geotextile has a strong adsorption effect, peripheral suspended matters can be adsorbed to the periphery of the activated carbon, compact suspended matter balls are formed around the activated carbon, and a compact suspended matter layer is formed, so that a gap between the curtain and the bottom is filled, and the suspended matters are fully intercepted on the side of the dredging area. Along with the dredging, the suspended matters in the dredged area are settled to the bottom of the river or lake and tend to a stable layer 11 to reach the balance, thereby achieving the aim of preventing the suspended matters from being dispersed during the dredging of the environment-friendly dredged sediment. And finally, disassembling the transfer device according to the dredging period and the settling period of the suspended matters, and recycling.
Example, the utility model discloses analyze white ocean lake environmental protection dredging engineering antifouling curtain application. Sampling and hydrodynamic condition observation are carried out between 3 months and 2019 months in 2018, according to the analysis result of the components of the sediment in summer and winter, the particle size distribution range in summer is mainly concentrated on 0.3-10 mu m, the particle size distribution range in winter of the sediment is mainly concentrated on 1-20 mu m, and the composite structure of the surface fiber web and the bottom fiber web of the anti-fouling curtain is determined to be used. The fiber raw material parameters are designed and calculated, the length is 38mm, the fineness is 0.8-2.5D and 1.5-3.5D, and the gram weight of the fiber web is 500-2Two steps of filtering accuracy of 1.75 μm and 6.25 μm can be realized. The optimized production process comprises selecting 13mm for pre-needling depth, 12.1mm for main needling depth, and 60 needling/cm for pre-needling density2The main needling density is 240 needling/cm2And the curtain is processed by adopting post-finishing technologies such as heat setting, calendaring, singeing and the like. According to the observation result of hydrodynamic conditions, the flow velocity of the multi-point water flow is 0.02-0.04 m/period, the maximum wind direction frequency is southwest wind (SSW) in warm season, average wind speed is 2.6m/s, northeast southeast wind (NNE) in cold season, average windThe speed is 2.7m/s, and meanwhile, the beaver 1200 type cutter suction dredger of the pseudo dredging ship belongs to fixed-point operation. On the whole, the hydrodynamic force condition in the dredging process is weak, and the horizontal acting force on the anti-fouling curtain is relatively small. According to the method in the utility model, to the white lake waters, determine each group unit antifouling curtain design parameter as follows: the length of the antifouling curtain is 20m, and the width of the antifouling curtain is 3 m; 10 PE floating bodies (the single PE floating body is 1m and 80kg/m) with the radius of 0.2 m; the iron chain weighs 60kg, and no anchor is used.
The curtain in the utility model is subjected to filtration test in a laboratory, the filtration result is shown in table 1, and the result shows that the interception rate of suspended matters in the particle size range of 0.3-10 mu m is 91.95%; the interception test is carried out by simulating the environment of the lake water area, the simulation result is shown in Table 2, the result shows that the interception rate of suspended matters at 1000r/min reaches 99.59%, the suspended matters in a disturbance area reach 10400mg/L (the source strength is 15cm, the flow speed is 0.14m/s), the interception rate of suspended matters turbidity reaches 99.93%, and the interception effect is good.
TABLE 1
TABLE 2
The above is only a preferred embodiment of the present invention, not to the limit of the present invention in any form, the technical concept of the present invention can be to the technical solution of the present invention can be transformed in multiple equivalent ways, and these equivalent transformations all belong to the protection scope of the present invention.
Claims (4)
1. An antifouling curtain suitable for river and lake environment-friendly dredging engineering is characterized by comprising four parts, namely a ductile accessory, an antifouling curtain main body, a functional structure adsorption main body and a fixing rod;
the ductile fitting comprises a floating body and an underlying chain; connecting the antifouling curtain main body with the central rod of the floating body through the thickened connecting hole by using a steel wire; the lower chains are uniformly distributed at the bottom end of the curtain and are buckled and connected through a balance weight ring compositely processed at the bottom end, and two ends of the iron chain are connected with the nylon ropes on the thickened connecting holes.
2. The anti-fouling curtain suitable for the environmental-friendly river and lake dredging engineering, which is characterized in that the anti-fouling curtain body is a high-precision non-woven fiber filtering material with a composite structure of an anti-fouling curtain surface fiber web and an anti-fouling curtain bottom layer fiber web.
3. The anti-fouling curtain suitable for the environmental-friendly river and lake dredging engineering according to claim 1, wherein the main adsorption body of the functional structure is activated carbon.
4. The anti-fouling curtain suitable for the environmental-friendly river and lake dredging engineering according to claim 1, wherein the floating bodies are connected in a group of 20 floating bodies;
the floating body is made of PE materials, and is a cylinder with the size of 20cm in radius and 100cm in length.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921384355.XU CN212248062U (en) | 2019-08-25 | 2019-08-25 | Antifouling curtain suitable for river and lake environment-friendly dredging engineering |
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| CN201921384355.XU CN212248062U (en) | 2019-08-25 | 2019-08-25 | Antifouling curtain suitable for river and lake environment-friendly dredging engineering |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110485364A (en) * | 2019-08-25 | 2019-11-22 | 天津大学 | A kind of antifouling curtain suitable for river and lake environmental dredging engineering |
| CN116623625A (en) * | 2023-07-11 | 2023-08-22 | 中交第四航务工程局有限公司 | Antifouling structure for DCM pile ship construction and use method thereof |
-
2019
- 2019-08-25 CN CN201921384355.XU patent/CN212248062U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110485364A (en) * | 2019-08-25 | 2019-11-22 | 天津大学 | A kind of antifouling curtain suitable for river and lake environmental dredging engineering |
| CN116623625A (en) * | 2023-07-11 | 2023-08-22 | 中交第四航务工程局有限公司 | Antifouling structure for DCM pile ship construction and use method thereof |
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