CN110485364A - A kind of antifouling curtain suitable for river and lake environmental dredging engineering - Google Patents
A kind of antifouling curtain suitable for river and lake environmental dredging engineering Download PDFInfo
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- CN110485364A CN110485364A CN201910787201.3A CN201910787201A CN110485364A CN 110485364 A CN110485364 A CN 110485364A CN 201910787201 A CN201910787201 A CN 201910787201A CN 110485364 A CN110485364 A CN 110485364A
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- 230000003373 anti-fouling effect Effects 0.000 title claims abstract description 63
- 230000007613 environmental effect Effects 0.000 title claims abstract description 19
- 239000000835 fiber Substances 0.000 claims abstract description 49
- 239000000463 material Substances 0.000 claims abstract description 33
- 238000001914 filtration Methods 0.000 claims abstract description 31
- 238000007667 floating Methods 0.000 claims abstract description 26
- 239000002344 surface layer Substances 0.000 claims abstract description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000010276 construction Methods 0.000 claims abstract description 8
- 239000000203 mixture Substances 0.000 claims abstract description 8
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 7
- 239000002131 composite material Substances 0.000 claims abstract description 7
- 238000010521 absorption reaction Methods 0.000 claims abstract description 5
- 150000001875 compounds Chemical class 0.000 claims description 9
- 238000005516 engineering process Methods 0.000 claims description 8
- 238000003754 machining Methods 0.000 claims description 8
- 238000003490 calendering Methods 0.000 claims description 7
- 230000008719 thickening Effects 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000002421 finishing Substances 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 239000004677 Nylon Substances 0.000 claims description 4
- 229920001778 nylon Polymers 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000005457 optimization Methods 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 28
- 238000000034 method Methods 0.000 abstract description 12
- 238000009792 diffusion process Methods 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 7
- 239000004744 fabric Substances 0.000 abstract description 6
- 239000013049 sediment Substances 0.000 abstract description 6
- 230000035755 proliferation Effects 0.000 abstract description 5
- 238000009826 distribution Methods 0.000 abstract description 4
- 229910052742 iron Inorganic materials 0.000 abstract description 3
- 235000017166 Bambusa arundinacea Nutrition 0.000 abstract description 2
- 235000017491 Bambusa tulda Nutrition 0.000 abstract description 2
- 241001330002 Bambuseae Species 0.000 abstract description 2
- 235000015334 Phyllostachys viridis Nutrition 0.000 abstract description 2
- 239000011425 bamboo Substances 0.000 abstract description 2
- 238000003912 environmental pollution Methods 0.000 abstract 1
- 238000009434 installation Methods 0.000 abstract 1
- 238000013461 design Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 9
- 239000010410 layer Substances 0.000 description 7
- 239000002994 raw material Substances 0.000 description 7
- 239000003344 environmental pollutant Substances 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 231100000719 pollutant Toxicity 0.000 description 6
- 238000012545 processing Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000006855 networking Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000003643 water by type Substances 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 238000000280 densification Methods 0.000 description 3
- 239000012065 filter cake Substances 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000012851 eutrophication Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 241000192700 Cyanobacteria Species 0.000 description 1
- 235000004443 Ricinus communis Nutrition 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011118 depth filtration Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000009940 knitting Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 230000002688 persistence Effects 0.000 description 1
- 230000003094 perturbing effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000003903 river water pollution Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/01—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements
- B01D29/05—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements supported
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
-
- 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
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Environmental & Geological Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Cleaning Or Clearing Of The Surface Of Open Water (AREA)
Abstract
The invention discloses a kind of antifouling curtains suitable for river and lake environmental dredging engineering, it is intended to solve the problems, such as that the suspended matter generated in dredging operation generates Heavy environmental pollution to external diffusion and endangers.The structure composition of the antifouling curtain includes ductility accessory, antifouling curtain main body, functional structure absorption main body, four part of fixed link.Ductility accessory includes PE floating body, underlying chain.It is buckled by the fixed cloth of the upper and lower ends bilayer of curtain and carries out installation fixation.Antifouling curtain main body is the high-precision non-woven fibre filtering material with surface layer fibre web, the composite construction of bottom fibre web researched and developed for river-lake environment, along the rectangular laying in dredged region.Functional structure adsorbs main body selection active carbon.Fixed link selects bamboo pole or iron rod according to the depth of water and flow condition.The present invention is directed to river-lake environment feature, develops the antifouling curtain suitable for river and lake environmental dredging engineering, proposes distribution method, provides a kind of device of effective non-proliferation for environmental dredging sediment digging process.
Description
Technical field
The invention belongs to dredging work environmental protection technical fields, and in particular to one kind is suitable for river and lake environmental dredging engineering
Antifouling curtain.
Background technique
In recent years, the interference of economic rapid growth and mankind's activity accelerates pollutant transporting to rivers and lakes, leads
Cause river and lake library water environment pollution problem be on the rise, be embodied in water eutrophication, it is black smelly phenomena such as.Years of researches and
It was verified that lake, river water reparation are the comprehensive engineerings of a system and complexity, it is necessary to take control source, cut dirty, ecology
Repair the governance model of the system being integrated with scientific management and synthesis.The source of the pollutant in lake river can be divided into endogenous dirt
Dye and external source pollution, main accumulation place of the bed mud as lake River Water Pollution object, is main endogenous pollution.
Endogenous important means --- environmental dredging is removed as most direct, most effective, the fastest, at present in world's model
It has obtained comparing in enclosing and be widely applied.China is for the purpose of improving river and lake library water environment and control eutrophication, successively too
The lakes such as lake, the West Lake, Dian Chi Erhai have carried out environmental dredging engineering.These dredging work majorities alleviate the pollution situation of water,
River, lake water quality and ecological ragime are effectively improved
However, forming disturbance during sediment digging construction operation to polluted bed mud due to dredging equipment work, excavating
Local waters sludge fine grained diffusion, spreads the pollutant being attached on fine grained also in water body around equipment, causes tight
The secondary pollution of weight should adopt an effective measure to prevent fine grained from spreading.Non-proliferation technology during existing dredging work is dredged
Using it is less, in the use (material, structure type) of antifouling curtain also more arbitrarily, work is extremely difficult in practical engineering application
Cheng Xiaoguo, nonstandard dredging non-proliferation technology even cause that the deterioration of cyanobacteria, lake are general etc. to endanger phenomenon in the short time.This hair
It is bright to be based on the river and lake environmental dredging engineering that is suitable for developed under this background to dredge process contaminant non-proliferation device-anti-
Dirty curtain prevents a large amount of as caused by dredging work its object is to effectively isolate in dredging short distance area with protection zone
Suspended matter reduces the region polluted by dredging work, achievees the purpose that specification dredging operation to external diffusion.
Summary of the invention
For in dredging work by hull is mobile and the reamer head course of work in suspended matter long range diffusion the phenomenon that, for gram
The deficiencies in the prior art are taken, the present invention provides a kind of antifouling curtain suitable for river and lake environmental dredging engineering, the antifouling curtains
It can be effectively isolated dredged area and protection zone, efficiently intercept the pollutant spread in Dredging Process, and assist its sinking.Device letter
Just, exploitativeness is strong.
The present invention is to solve the technical issues of proposing in background technique, the technical solution adopted is that a kind of be suitable for river and lake ring
The antifouling curtain for protecting dredging work adsorbs main body, four part of fixed link by ductility accessory, antifouling curtain main body, functional structure
Composition；The ductility accessory includes floating body, underlying chain；Using steel wire by thickening convergence hole for antifouling curtain main body and floating body
Center-pole linking；Underlying chain is evenly distributed on curtain bottom end, is engaged linking, iron chains two by the counterweight ring of bottom end Compound Machining
It holds and is connected with the nylon rope thickeied above convergence hole.
The antifouling curtain main body is the height with antifouling curtain surface layer fibre web, the composite construction of antifouling curtain bottom fibre web
Precision non-woven fibre filtering material.Its filtering accuracy is 1.75 μm and 6.25 μm of two gradients.Filtering accuracy is 1.75 μm
Non-woven material, it is the fibrous raw material of 0.8-2.5D that fiber, which selects fineness, and length 38mm, thin/crude fibre percentage is 60/
40 are uniformly mixed, and are processed through shredding, uniformly mixed and networking, Compound Machining are carried out according to design structure, finally again through heat
It is formed, singes and any surface finish such as calendering arrange, form any surface finish, densification and uniform material.Filtering accuracy is 6.25 μm
Filtering material select the fibrous raw material of 1.5-3.5D it is thin/crude fibre percentage is 65/35 to carry out shredding, be uniformly mixed and networking
Processing, finally carry out Compound Machining, then through thermal finalization, singe and any surface finish such as calendering arrange.Finally by the two Compound Machining
It arranges.
The functional structure absorption main body selects active carbon.
The floating body every 20 are one group of linking.
The floating body uses PE material, and having a size of radius 20cm, the cylindrical body of long 100cm is constructed using novel floating body.
The structure composition of the antifouling curtain includes ductility accessory, antifouling curtain main body, functional structure absorption main body, fixation
Four part of bar composition.
Beneficial effects of the present invention:
1. antifouling curtain main body of the invention is based on before river-lake environment Sediment Composition, geometry, distribution of particles analysis
Put determination.Therefore specificity curtain (fineness of raw material) can be optimized, be suitable for through analysis of experiments for different river-lake environments
River and lake dredging engineering, it is with strong points.
2. the fiber filter material (polypropylene fibre) filtered out small, moderate strength, excellent spring, wearability with matrix density
Good, the advantages that hygroscopicity is minimum, chemical corrosion resistance, application environment is relatively broad, and engineering effort is more obvious.
3. the antifouling curtain in the present invention is the non-woven fibre of high-precision with surface layer fibre web, the composite construction of bottom fibre web
Dimensional filter material.1.75 μm and 6.25 μm of double gradient filtration precision structures can be widely used in river and lake dredging engineering, simultaneously
Good both surface filtration environment has been built, and has improved backwash cleaning performance.
It is said that 4. curtain under varying environment lay form, counterweight etc. can based on river and lake hydrodynamic force comprehensive function power it is bright in
Mechanics calculating formulae is accurately calculated.
5. ductility accessory, antifouling curtain main body, functional structure flocculation main body, four part of fixed link by buckle, ring, rope,
The linking of the forms such as hook, while each interception unit can connect flexible in application, convenient disassembly from beginning to end on demand.Device is flexible in application,
It is convenient for disassembly and assembly.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the antifouling curtain of the present invention.
Fig. 2 is that operating condition blocks dirty schematic diagram.
Fig. 3 is antifouling curtain double-layer structure figure: the surface layer sectional view of a- filtering material；B- filtering material obtains bottom section
Figure；C- double-layer structure schematic diagram.
Fig. 4 is functional structure adsorbent material figure.
Wherein: 1, antifouling curtain main body, 1-1, antifouling curtain surface layer fibre web, 1-2, antifouling curtain bottom fibre web, 2, function
Structure adsorbs main body, 3, floating body, 4, underlying chain, 5, convergence hole, 6, thickening convergence hole, 7, chain splicing, 8, counterweight ring, 9, fixation
Bar, 10, bed mud, 11, stabilized zone
Specific embodiment:
Below with reference to embodiment and attached drawing, invention is further described in detail.The embodiment of the present invention is in order to more preferable
Ground makes those skilled in the art more fully understand the present invention, but does not make any limitation to the present invention.
Such as Fig. 1, the structural schematic diagram of antifouling curtain, including antifouling curtain main body 1, functional structure adsorb main body 2, ductility
Accessory is made of floating body 3 and underlying chain 4,9 four part of fixed link.Antifouling curtain main body is to be researched and developed for river-lake environment with anti-
The high-precision non-woven fibre filtering material of the composite construction of dirty curtain surface layer fibre web 1-1, antifouling curtain bottom fibre web 1-2, respectively
Independent curtain is used in series with nylon rope by the linking of convergence hole 5 according to actual needs, and part is overlapped；Functional structure adsorbs main body
2 are fixed on surface fibre bottom (dredging side) using 53 type sewage treatment active carbons in Fig. 4, by geotechnological Gridding needle bundle；
PE floating body 3 every 20 are one group of linking, using steel wire by thickening convergence hole 6 for the antifouling curtain main body 1 of 20m long and PE floating body
3 center-pole linking.Underlying chain 4 is evenly distributed on curtain bottom end, is engaged linking, iron by the counterweight ring 8 of bottom end Compound Machining
Chain both ends are connected with the nylon rope thickeied above convergence hole；Fixed link 9 be inserted vertically into river and lake bottom 0.5-1.5m depth, river-lake environment because
Hydrodynamic condition is relatively stable, and curtain curtain is set has certain distance apart from dredger ship, can be considered static dredging, big for mobility
River and lake, according to the actual situation using anchor block be fixed on bottom end thicken fixation hole 6 at.
Ductility accessory includes PE floating body 3, underlying chain 4: its role is to keep the transverse and longitudinal under antifouling curtain operating condition to prolong
Malleability.Floating body uses PE material, and having a size of radius 20cm, the cylindrical body of long 100cm is constructed using novel floating body, in various water
Enough stability can be kept under the environment of domain, and buoyancy stabilization is not easy to lose.Single floating body buoyancy is 80kg/m, is led to each other
Center-pole series connection is crossed, guarantees its globality and stability in water body, buoyancy surplus coefficient is 0.3.Underlying chain is selected cheap
The iron chains being easy to get is connected by the counterweight ring of curtain bottom with curtain, guarantees the uniformity and extension of curtain vertical applied force
Property, iron chains quality is accounted according to different hydrodynamic condition to be obtained.
Antifouling curtain main body be for river-lake environment research and develop have surface layer fibre web, bottom fibre web composite construction it is high-precision
It spends non-woven fibre filtering material: its role is to which dredged area to be isolated with protection zone, preventing suspended matter caused by dredging into one
Step diffusion.It is preferred through river-lake environment performance analysis and material property, determine raw material of the polypropylene fibre as antifouling curtain main body.Surface layer is thin
Intersect that close, aperture is small, fine and close and be evenly distributed, meet filtering accuracy and realize both surface filtration effect between fiber, towards dredging
The waters Jun Qu；Bottom crude fibre can form biggish aperture, higher porosity, mainly provide biggish filtration flux, reduction
Filtration resistance improves filtering material pollutant energy and increases the backwash effect of material, recycling for material is realized, towards guarantor
The waters Hu Qu.
Different river-lake environments are calculated with Simmonds theoretical formula (1): D is average-the average hole of non-woven material
Diameter (μm), Df- fibre diameter (μm), ε-porosity, ρ-fibre density (g/cm3), De-fibre fineness (D), m-fibre web
Grammes per square metre (g/m2), σ-web caliper (mm)
Wherein, De(fibre fineness) belongs to direct system.M (fibre web grammes per square metre): refer to the weight grams of every square meter fibre web.(the hole ε
Gap rate): refer to that fibre web void volume accounts for the percentage of whole Web volume.D can be released according to above-mentioned formulafAnother kind expression
Formula:
The invention is analyzed according to river and lake Sediment Composition, determines that filtering accuracy is 1.75 μm and 6.25 μm of two gradients.
Design meets the non-woven filter material of filter gradient requirement, determines that filtering accuracy is 1.75 μm of non-woven material, fiber
Select fineness for the fibrous raw material of 0.8-2.5D, length 38mm, thin/crude fibre percentage is uniformly mixed for 60/40, is passed through
Shredding is uniformly mixed and networking processing, carries out Compound Machining according to design structure, finally again through thermal finalization, singe and calendering etc.
Any surface finish arranges, and forms any surface finish, densification and uniform material.The filtering material that filtering accuracy is 6.25 μm selects 1.5-
The fibrous raw material of 3.5D is thin/and crude fibre percentage is 65/35 to carry out shredding, be uniformly mixed and networking processing, it finally carries out compound
Processing, then through thermal finalization, singe and any surface finish such as calendering arrange.The two Compound Machining is arranged again.Optimize needling non-woven
The production technology of filtering material are as follows: pre-needling depth selects 13mm, and main depth of needling selects 12.1mm, and pre-needling density selects 60
Thorn/cm2, main needling density selection 240 thorns/cm2, and using thermal finalization, calendering, the final finishings technology such as singe, using final finishing skill
Art makes the bright and clean densification in non-woven fibre filtering material surface layer, can make to be filtered particle and is piled into filter cake in filtering material layer, subtracts
Slow filtering particle, which largely enters, forms irreversible deposit inside filtering material, have good both surface filtration and backwash cleaning
Performance.Curtain bottom end is standby to stay 3cm thickening layer, and for being connected counterweight ring 8, laying form is blocked to be rectangular around laying or vertical riverbank
It cuts and lays.
Functional structure absorption main body selects active carbon: its role is to adsorb bottom diffusion suspended matter in Dredging Process and prevent
The suspended matter that dirty curtain main body 1 and the contact process of bed mud 10 raise.Make full use of that activated carbon adsorption capacity is big, adsorption rate
Fastly, the advantages that mechanical strength is good adsorbs pollutant and forms barrier in the bottom end of antifouling curtain, and then persistence is intercepted because antifouling
Curtain contacts not close, hydrodynamic force with river and lake bottom and evokes suspended matter caused by the factors such as bottom end curtain.It determines and selects 53 type sewage
Active carbon is handled, usage amount 2-5kg/m, size is between 8-30 mesh, 200 mesh percent of pass >=90% of granularity.Pass through breathable cloth
It is processed as latticed (single size of mesh opening is 5cm*5cm), processes the smooth surface that knitting is fixed on curtain together with curtain final finishing
At (dredged area side) bottom end 5cm, it is allowed to form a main body with curtain.By solid along the sealing of front end cloth under antifouling curtain main body
It is fixed.
Fixed link selects bamboo pole or iron rod according to the depth of water and flow conditions situation.Its role is to fix the position of curtain,
Main flow dynamic is shared, damages it because instantaneous force is excessive.Fixed shank diameter is about 5-15cm, is about 2-
5m, diameter can suitably increase according to hydrodynamic condition, and length is determined according to different water depth.Pass through up and down the two of antifouling curtain
The rectangular rope for thickening cloth carrying of end 3cm*3cm and steel wire are attached thereto.
Cloth is thickeied by part, steel wire carries out extension accessory, functional structure is flocculated between main body and four part of fixed link
Linking guarantees ductility of the antifouling curtain when intercepting and blocks dirty functionality.
According to the handling characteristics of antifouling curtain and its application site in non-proliferation technique in the present invention, applied at it
Consider there is following factor (referring to infrastructure projects such as harbour, oceans) in journey: 1. considering the mechanics shadow that water flow, wind generate device
It rings；2. consider device attribute itself, counterweight, fixed function caused by anchor pulling force, laid in practical engineering application follow it is following
Mechanics Calculation, the basis such as corresponding counterweight, floating body are calculated.
(1) load calculates
(1) W1 lake current load: W1=0.5 × ρw×Cd×Dr×u2×Kc (1)
Wherein, ρwWater density；CdResistance coefficient；DrCurtain height；U water velocity；KcEquivalent coefficient；
(2) W2 wind load: W2=0.5 × ρa×Cd×Fr×v2(2)
Wherein, ρaAtmospheric density；CdResistance coefficient；FrFloating body diameter；V wind speed；
(3) W3 ripples load: W3=0.5 × ρw×Cd×[(π×H/T)×(1/sinh(2×π×h/L))]2×(L/8
π)×[sinh(4×π×h/L)-sinh[4×π×(h-Dr×Kc)/L]+4×π×Dr×Kc/L](3)
Wherein: ρwWater density；DrCurtain height；H ripples height；The T period；L wavelength；H water depth；KcEquivalent coefficient
(4) design surface load: W=W1+W2+W3 (4)
(2) anchor cable pulling force calculates
(1)TrAnchor cable pulling force
Tr=A × W/cos θ (5)
Wherein, θ anchor cable horizontal inclination angle；A spacing
(2)TaDesign anchor cable pulling force: Ta=Tr×SFa(6)
SFaAnchor cable safety coefficient
(3)LarAnchor cable length
Lar=α (h+H/2)/sin θ (7)
Wherein, α redundancy；The h depth of water；H ripples height；θ anchor cable horizontal inclination angle
(4)WaAnchor block gravity
Wa=SFa×[Tr×cosθ/(αK)+Tr×sinθ]×γc/(γc-1)(8)
Wherein, SFaAnchor cable safety coefficient；θ anchor cable horizontal inclination angle；α redundancy takes 1.05；K anchor cable tension coefficient；γcAnchor
Block specific gravity；
(3) antifouling curtain tension calculates
(1)P1Water flow pressure: P1=0.5 × ρw×Cd×u2×Kc(9)
Wherein, ρwWater density；CdResistance coefficient；U water velocity；KcEquivalent coefficient takes 0.7
(2)P2Ripples pressure
P2=0.5 × ρw×Cd×[(π×H/T)×(1/sinh(2×π×h/L))]2×(L/8π)×[sinh(4×π
×
h/L-sinh4×π×h-1/L+4×π/L(10)
Wherein, ρwWater density；CdResistance coefficient；H ripples height；The T ripples period；L wavelength；H water depth
(3)TsCurtain tension
Wherein, a=0.5 × A a；A anchor block spacing；δmaxMaximum horizontal deviation；P=P1+P2
(4) buoyancy calculations
F=Tr×sinθ/A(12)
θ anchor cable horizontal inclination angle；A spacing
Floating body buoyancy is calculated by water body half is sunk to, and discriminates whether the buoyancy requirement for meeting device.
According to above-mentioned calculated result, in conjunction with on-site actual situations, determine that the antifouling curtain design parameter of every group of unit is as follows: anti-
Dirty curtain length, width；Floating body proportion；Iron chains counterweight, anchor laying etc..
Placement position is determined under the guidance such as Practical Project requirement, analog result.One end is first fixed when launching water body to fix
Bar, while good part floating body being installed, then will slowly launch water body with counterweight chain curtain one end, fixed link is installed when launching,
Ensure antifouling curtain bottom end contact river and lake, is finished until laying.
Such as Fig. 2, during environmental dredging, when carrying object passes through antifouling curtain surface layer fibre web 1-1, antifouling curtain from dredged area
When curtain bottom fibre web 1-2, by the meeting under the physical factors effects such as interception, inertia diffusion, sedimentation of the suspended particulate of carrying object entrainment
It is detached from carrying object streamline, and then close to the surface layer surface fibre web 1-1.The effect of molecular force and physical and chemical adsorption power between substance
Under, suspended particulate can be adsorbed on the surface of filtering material or be adsorbed on the particle surface for having formed " filter cake ", realize surface layer mistake
Filter effect, on antifouling curtain surface layer, fibre web is formed about higher concentration, due to bonding journey between filtering material and suspended particulate
Degree is not too strong, and the suspended particulate that a part has been adhered will be peeled off from " filter cake " surface, and then bring bottom by carrying object
Layer fibre web 1-2, is adsorbed retention again, realizes in-depth filtration effect；When bottom carrying object moves to curtain periphery, because native
The active carbon that work cloth is wrapped up has stronger suction-operated, and the suspended matter on periphery can be adsorbed to active carbon periphery, in activity
Fine and close suspended matter ball is formed around charcoal, is formed fine and close suspension nitride layer and is allowed outstanding to fill the gap between curtain and bottom
Floating object is sufficiently trapped in this side of dredged area.With the passage of dredging, dredged area suspended substance sedimentation to river and lake bottom is intended to surely
Given layer 11 simultaneously reaches balance, to achieve the purpose that environmental dredging sediment digging suspended matter non-proliferation.Finally according to the dredging period
And the sedimentation period of suspended matter, transfer device is dismantled, is recycled.
Embodiment, the present invention analyze the antifouling curtain application of Baiyang Lake environmental dredging engineering.In March, 2018 extremely
Sampling and hydrodynamic condition observation, are analyzed according to winter in summer Sediment Composition as a result, summer particle size distribution range during in March, 2019
It is concentrated mainly on 0.3-10 μm, bed mud winter particle size distribution range is concentrated mainly on 1-20 μm, determines using anti-in the present invention
The composite construction of dirty curtain surface layer fibre web, antifouling curtain bottom fibre web.Fibrous raw material parameter is calculated by design, and length is selected
38mm, fineness select 0.8-2.5D and 1.5-3.5D, fibre web grammes per square metre 500-750g/m2, it can be achieved that 1.75 μm of filtering accuracy and
6.25 μm of two steps.Optimized production process is that pre-needling depth selects 13mm, and main depth of needling selects 12.1mm, and pre-needling is close
Degree selects 60 thorns/cm2, main needling density selection 240 thorns/cm2, and using thermal finalization, calendering, the final finishings technology such as singe processing
Curtain out.According to hydrodynamic condition observed result, during which multi-point flow rate of water flow is between 0.02-0.04m/, and wind direction frequency is most
Big is warm season swbs wind (SSW), mean wind speed 2.6m/s, cold season northeast by north wind (NNE), mean wind speed
2.7m/s, while quasi- 1200 type cutter suction dredger of dredger ship castor belongs to Fixed Point Operation.Generally speaking the hydrodynamic(al) in Dredging Process
Power condition is more faint, relatively small to the horizontal applied force of antifouling curtain.According to the method in invention, vehicle is burnt for Baiyang Lake
Shallow lake waters determines that the antifouling curtain design parameter of every group of unit is as follows: antifouling curtain length is 20m, width 3m；PE floating body 10
(being individually 1m, 80kg/m), radius 0.2m；Iron chains counterweight 60kg does not use anchor.
Test is filtered to the curtain in invention in laboratory, filter result is shown in Table 1, the results showed that 0.3-10 μm of partial size
Suspended matter interception rate in range is 91.95%；Simulation Baiyang Lake water environment carries out interception test, and analog result is shown in Table 2, knot
Fruit shows the suspended matter interception rate of 1000r/min up to 99.59%, and perturbing area suspended matter (at source strength 15cm, is flowed up to 10400mg/L
Speed is 0.14m/s), for suspended matter turbidity interception rate up to 99.93%, interception effect is preferable.
Table 1
Table 2
The above is only a preferred embodiment of the present invention, is not intended to limit the present invention in any form, In
In range of the technology design of the invention, a variety of equivalents can be carried out to technical solution of the present invention, these equivalents are equal
It belongs to the scope of protection of the present invention.
Claims (6)
1. a kind of antifouling curtain suitable for river and lake environmental dredging engineering, which is characterized in that by ductility accessory, antifouling curtain master
Body, functional structure absorption main body, four part of fixed link composition；
The ductility accessory includes floating body, underlying chain；Using steel wire by thickening convergence hole for antifouling curtain main body and floating body
Center-pole linking；Underlying chain is evenly distributed on curtain bottom end, is engaged linking, iron chains two by the counterweight ring of bottom end Compound Machining
It holds and is connected with the nylon rope thickeied above convergence hole.
2. a kind of antifouling curtain suitable for river and lake environmental dredging engineering according to claim 1, which is characterized in that described
Antifouling curtain main body is the non-woven fibre of high-precision with antifouling curtain surface layer fibre web, the composite construction of antifouling curtain bottom fibre web
Dimensional filter material.
3. the production technology of the optimization needling non-woven filtering material of the antifouling curtain in claim 1 are as follows: the choosing of pre-needling depth
With 13mm, main depth of needling selects 12.1mm, and pre-needling density selects 60 thorns/cm2, and main needling density selects 240 thorns/cm2, and
Using thermal finalization, calendering, the final finishings technology such as singe.
4. a kind of antifouling curtain suitable for river and lake environmental dredging engineering according to claim 1, which is characterized in that described
Functional structure adsorbs main body selection active carbon.
5. a kind of antifouling curtain suitable for river and lake environmental dredging engineering according to claim 1, which is characterized in that described
Floating body every 20 are one group of linking.
6. a kind of antifouling curtain suitable for river and lake environmental dredging engineering according to claim 1, which is characterized in that described
Floating body uses PE material, and having a size of radius 20cm, the cylindrical body of long 100cm is constructed using novel floating body.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104131413A (en) * | 2014-07-22 | 2014-11-05 | 中交天津港航勘察设计研究院有限公司 | Non-woven material with self-cleaning function for liquid filtering |
| CN104141284A (en) * | 2014-08-13 | 2014-11-12 | 江苏省南京市航道管理处 | Antifouling method for dredged mud in construction of water dredging engineering |
| CN212248062U (en) * | 2019-08-25 | 2020-12-29 | 天津大学 | Antifouling curtain suitable for river and lake environment-friendly dredging engineering |
-
2019
- 2019-08-25 CN CN201910787201.3A patent/CN110485364A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104131413A (en) * | 2014-07-22 | 2014-11-05 | 中交天津港航勘察设计研究院有限公司 | Non-woven material with self-cleaning function for liquid filtering |
| CN104141284A (en) * | 2014-08-13 | 2014-11-12 | 江苏省南京市航道管理处 | Antifouling method for dredged mud in construction of water dredging engineering |
| CN212248062U (en) * | 2019-08-25 | 2020-12-29 | 天津大学 | Antifouling curtain suitable for river and lake environment-friendly dredging engineering |
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