CN103321195B - A kind of agricultural ecological interception irrigation canals and ditches and construction method thereof that adopts bulkhead tech - Google Patents

A kind of agricultural ecological interception irrigation canals and ditches and construction method thereof that adopts bulkhead tech Download PDF

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CN103321195B
CN103321195B CN201210303211.3A CN201210303211A CN103321195B CN 103321195 B CN103321195 B CN 103321195B CN 201210303211 A CN201210303211 A CN 201210303211A CN 103321195 B CN103321195 B CN 103321195B
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China
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ditches
irrigation canals
trench
ditch
furrow bank
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CN201210303211.3A
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Chinese (zh)
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CN103321195A (en
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王振旗
钱晓雍
沈根祥
郭小品
洪祖喜
陈伟
顾海蓉
郭春霞
朱英
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上海市环境科学研究院
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Abstract

The invention discloses a kind of agricultural ecological interception irrigation canals and ditches and construction method thereof that adopts bulkhead tech. This irrigation canals and ditches cross section is inverted trapezoidal, and bottom of trench is Prefabricated porous plate, and hole is " S " type interlaced arrangement, the local perennial water plant of plantation in hole; After the compacting of the furrow bank soil body, paste soil and lay three-dimensional plant net and add a cover Prefabricated porous plate, parallel uniform some holes are divided in this plate middle and upper part, plantation Bermuda grass replay rye grass in hole; Water inlet end is established grid, and controlled emptying gate is established in water side. By the Reasonable Arrangement in planting hole, and utilize the anchorage effect of root system, vegetation net to reach irrigation canals and ditches Stability Analysis of Structures. Ecological intercepting irrigation canals and ditches of the present invention, stabilized structure, its structural stability can reach the concrete irrigation canals and ditches structural strength that facility grainfield is built substantially, can effectively resist agricultural drain water erosion, can effectively tackle particularly suspension, the nitrogen phosphorus etc. in the draining of nonirrigated farmland of farmland simultaneously; And do not occupy cultivated land, construction costs is low, it is simple and easy to operate, and is suitable for large scale application.

Description

A kind of agricultural ecological interception irrigation canals and ditches and construction method thereof that adopts bulkhead tech
Technical field
The invention belongs to widespread pollution from the overuse of fertilizers and pesticides in rural area control technology field, be specifically related to a kind of collection farmland prevention waterlogging stagnant function of row and agricultural run-offPollutant interception function, in one, adopts agricultural ecological interception irrigation canals and ditches and the construction method thereof of bulkhead tech.
Background technology
In recent years, along with China's plant husbandry production modernization and intensive high speed development, be the high yield that covets, farmland chemical fertilizerUse excessive and unreasonable service condition and day by day highlight, the important body eutrophication such as Taihu Lake, Dian Chi that nitrogen phosphorus nutrient loss causesPhenomenon is on the rise. The national Pollutant source investigation communique demonstration for the first time of issuing for 2010, widespread pollution from the overuse of fertilizers and pesticides in rural area has become China's waterThe main source of the pollutants such as environment nitrogen phosphorus. Wherein, Taihu Lake basin is along with after industrial point source pollution control dynamics strengthens, agriculturalPollution of area source affects the shared proportion of river basin water quality and day by day increases, and the contribution of total nitrogen is 34~52%, and the contribution of total phosphorus exists17~54%, become the important origin cause of formation of Taihu Lake basin water body eutrophication.
With regard to the research of widespread pollution from the overuse of fertilizers and pesticides in rural area control technology aspect, artificial swamp, vegetation buffer strip, many pools system are there is both at home and abroadThe multiple technologies forms such as system, have the advantages such as profitable on ecology, operating cost is low. But above technology all needs to take large area and ploughs,Apply and be restricted in the many areas of having a large population and a few land of China. And China experts and scholars have just started ecological ditch at the beginning of 21 centuryThe research of canal and application work have obtained remarkable achievement in the research of Farmland Flow Pollution thing Interception Technology, but because the past is to ditchBody structure design is paid attention to not enough, particularly due to often large (60 ° of >) of the gradient of furrow bank, ubiquity water in later stage runningPower is washed away the problem such as bank landslip, water plant death causing, and then causes ecological canal purification efficiency greatly to reduce.
Summary of the invention
The object of the invention is to: the pollution of area source feature producing according to plant husbandry, for going out in past structure ecological canal processThe problems such as existing structural stability is poor, provide one to meet structural strength requirement, the collection farmland prevention waterlogging stagnant function of row and agricultural run-off dirtDye thing interception function in one, adopt agricultural ecological interception irrigation canals and ditches and the construction method thereof of bulkhead tech.
Design of the present invention: build present situation in conjunction with the current agriculture drainage ditch of China, on the basis of forefathers' research, three-dimensional is plantedThing net bulkhead tech is applied in the construction of ecological intercepting irrigation canals and ditches, and according to irrigation canals and ditches drainage system hydraulics and engineering mechanics feature, closesRemoving the work is established planting hole, utilizes the anchorage effect between root system and three-dimensional plant net to reach irrigation canals and ditches Stability Analysis of Structures, and then fully sends outWave its ecological purification function.
Technical scheme of the present invention is as follows:
Agricultural ecological interception irrigation canals and ditches that adopt bulkhead tech, the water inlet end of irrigation canals and ditches is provided with coarse rack, and water side is provided with controlled rowSluice gate, ditch body cross section is inverted trapezoidal, bottom of trench and furrow bank have all been laid Prefabricated porous plate, the porous plate hole of bottom of trench, furrow bankInside plant water plant; It is characterized in that: furrow bank, below Prefabricated porous plate, is also close to the compacting soil body and has been laid one deck three-dimensionalPlant net; Hole on bottom of trench Prefabricated porous plate is " S " type and is staggered.
Preferred version:
Ditch body cross dimension is preferred: upper wide 1.5m, lower wide 0.5m, ditch depth 1.0m; Superelevation (press by the gallery that is irrigation canals and ditches topToplap goes out the height of field, farmland face) preferred 0.2m.
Prefabricated board perforate mode is: trench floor adopts the staggered perforate mode perforate of " S " type; Ditch wallboard is reserved one section of height (distance in bottomThe height of the about 0.45m in bottom) not perforate, adopt the perforate of parallel uniform hole mode apart from the above part of bottom 0.45m.
Bottom of trench prefabricated board is rectangle, is of a size of 500mm × 1200mm, and thickness of slab 40mm lays bar-mat reinforcement in it; Monolithic ditchOn base plate, arrange 5 and be the circular opening (D150mm) that " S " type is laid.
Furrow bank prefabricated board is rectangle, is of a size of 600mm × 1200mm, and thickness of slab 40mm lays bar-mat reinforcement in it; Monolithic ditch12 parallel uniform circular openings (D100mm) are set on wallboard.
The top of furrow bank prefabricated board has one section of reinforcing bar to exceed concrete part, and when construction, top reinforcing bar exceeds part and stretches into furrow bank topThe gallery of the portion inside of bearing down on one.
The preferred EM2 of three-dimensional plant net model, wide 1.0m, three-dimensional plant net 3 upper ends some (100mm left and right) stretched intoBelow the gallery at furrow bank top bears down on one.
In hole, water plant is local perennial water plant kind, and phytomass is large, and nitrogen phosphorus nutrient demand is high.
The water inlet end of irrigation canals and ditches arranges board plug type coarse rack, and water side arranges controlled emptying gate; Grid is placed in agricultural drain mouth, withFilter large suspension, weeds rhizome etc.; Controlled emptying gate arranges multiple height flashboard, according to farmland drainage features in season handIndustry control system. In addition, according to service farmland actual demand, the auxiliary equipment such as guidance tape, bottom of trench downflow weir, coarse rack can be set.
In the present invention, ditch body section size is according to agricultural drain feature and the design of engineering structure mechanics, and preferred size is: upper wide 1.5m,Lower wide 0.5m and ditch depth 1.0m, guaranteeing, in giving full play to the stagnant function of irrigation canals and ditches prevention waterlogging row, significantly increases its stabilized structureProperty and service life, mentality of designing is as follows:
(1) ditch depth
Designing requirement according to China about escape canal, reference farm irrigation facility project construction experience in the past, controls stagnant drainerJourney should be arranged the stagnant degree of depth as Engineering Control standard taking the maximum that meets crops requirement in the time of infertility, and rice workspace is at dry field phase 3~5dPlanted agent guarantees that bury of groundwater is down to 0.4~0.6m. Therefore, in conjunction with District of Shanghai field irrigation canals and ditches spacing (100~250m), ditchCanal adopts flat, according to flow inclination, and the stagnant degree of depth 0.6m of the row of choosing, the daily depth of water 0.1 ~ 0.2m, superelevation 0.2m, thus determineDitch depth is 1.0m.
(2) cross sectional dimensions
The ecological canal of planning and designing is dual-purpose for the water drainage of row's stain, and cross sectional dimensions is checked according to water drainage design discharge. The present invention's water drainageFunction meets 1~3d heavy rain, the 3~5d meeting for 10 years and drains into the dark requirement of resistance to waterflooding. What met for 10 years one District of Shanghai falls on the 1stRainfall is 176mm left and right, and water drainage design modulus is pressed 2.0m3/km2.s meter, under this flow flow velocity should meet do not rush do not become silted up wantAsk.
Canal bottom width degree minimum of a value is generally 0.5m, and slope coefficient is got 0.25 o'clock, upper wide 1m, and by flow capacity checking, flow velocity can meetCode requirement. But consider channel volume that ecological intercepting irrigation canals and ditches water plant takies and local usual practice, slope coefficient is suitableWork as amplification, ecological intercepting irrigation canals and ditches slope coefficient gets 0.4. To sum up, design ecological intercepting irrigation canals and ditches cross section is inverted trapezoidal, cross section chiVery littlely be: ditch depth 1.0m, bottom width 0.5m, upper wide 1.5m.
In addition, prefabricated board specification, concrete grade, reinforcing bar model all can the actual choose reasonable of incorporation engineering. Prefabricated board specificationWhat choose main consideration is that structural strength and construction are convenient, but thickness can not to subtract (be that bottom of trench, furrow bank prefabricated board thickness should be not less than40mm). Void shape and size Selection are also mainly considered cost of manufacture, solid native ability etc. Planting different water plants can rootBy experience, aperture is set according to its phytomass size, in view of hole is offered the structure influence to cement plate, the preferably warp of specific area maximumAllusion quotation circular port.
In the present invention, irrigation canals and ditches size is determined according to being mainly to reach the anti-stagnant requirement of water drainage, and for the way of structural stability designMainly that perforate mode and three-dimensional plant net laying are established. The design of whole ecological canal should be carried out according to such main line: first fullFoot drainage requirement: determine cross dimensions; Secondly consider steadiness: boring method, laying plant net etc.; The 3rd considers ecological property:The parameters such as the plantation of bottom of trench water plant " S " type, plant variety, spacing in the rows are selected.
A kind of construction method of the agricultural ecological interception irrigation canals and ditches that adopt bulkhead tech: first according to the anti-stagnant requirement of water drainage, agricultural drainFeature and engineering structure mechanics design, and determine the cross sectional dimensions of irrigation canals and ditches, and trimming or the body of newly ditching, in the water inlet end setting of irrigation canals and ditchesGrid, water side arranges controlled emptying gate; Secondly consider the steadiness of ditch body: furrow bank, on the basis of soil body compacting, is adjacent toLay one deck three-dimensional plant net, add a cover Prefabricated porous plate on the net at three-dimensional plant; Trench floor adopts the staggered perforate mode perforate of " S " type;Ditch wallboard is reserved not perforate of one section of height (apart from the height of the about 0.45m in bottom) in bottom, adopts apart from the above part of bottom 0.45mThe perforate of parallel uniform hole mode; The 3rd considers the ecological property of irrigation canals and ditches: on trench floor, be planting plants in the hole that " S " type arrangesThe perennial water plant in this locality that amount is large, demanding volume of nitrogen and phosphorus is large; Planting aquatic plants in parallel uniform hole on ditch wallboard.
Specifically comprising the steps: of said method
(1) determine that ditch body cross dimension is preferred: upper wide 1.5m, lower wide 0.5m, ditch depth 1.0m, the preferred 0.2m of superelevation;By size trimming or the body of newly ditching, and build plain concrete bed course in lower end, bottom of trench both sides;
(2) according to irrigation canals and ditches length and the furrow bank both sides gross area, calculate and buy required three-dimensional plant net;
(3) bottom of trench prefabricated board customized, preferably: rectangle, size 500mm × 1200mm, thickness of slab 40mm, lays in itBar-mat reinforcement, leaves 5 and is the circular opening (D150mm) that " S " type is laid on plate; Furrow bank prefabricated board customized, preferably: rectangle,Be of a size of 600mm × 1200mm, thickness of slab 40mm, lays bar-mat reinforcement in it, and the reserved one section of reinforcing bar in top bears down on one and is connected with galleryWith, separating 12 parallel uniform circular openings (D100mm) apart from the above portion of bottom 0.45m;
(4) furrow bank, on the basis of soil body compacting, is adjacent to and lays one deck three-dimensional plant net, and three-dimensional plant is held some on the net(100mm left and right) stretched on the gallery at furrow bank top;
(5), at the online bedding furrow bank of three-dimensional plant Prefabricated porous plate, ditch wallboard bottom is placed on plain concrete bed course; Ditch wallboard top is pre-The reinforcing bar staying stretches on the gallery on the ditch ridge, and lays vertical reinforcement, then at gallery upper cement, forms gallery and bears down on one, ditchThe reserved reinforcing bar in wallboard top stretches into the gallery inside of bearing down on one; (the part that exceeds of the online end of three-dimensional plant stretches under gallery bears down on oneFace; )
(6) lay bottom of trench Prefabricated porous plate at bottom of trench, furrow bank prefabricated board lower end has a bit of below trench floor;
(7) on trench floor, be in the hole that " S " type arranges and plant wild rice stem or yellow flag; Parallel uniform hole on ditch wallboardInterior employing turf transplanting mode plantation bermudagrass grass, the rye grass of replaying winter.
The present invention is on the basis of original " whole concrete prefabricated board " type and simple and easy soil property irrigation canals and ditches, carry out engineered accordingly,Make it have draining and ecological functions concurrently. Application by three-dimensional plant net bulkhead tech and bottom of trench, furrow bank prefabricated board hole rationallyArrange, utilize the anchorage effect of root system and plant net to strengthen its structural stability, firmly degree approaches the coagulation that facility grainfield is builtThe requirement of soil irrigation canals and ditches. In bottom plate hole, plant local perennial water plant, the good oxygen system of secreting that root can form, strengthens micro-lifeThing activity, and then by effects such as interception, absorption, absorptions, the pollutant such as nitrogen phosphorus in runoff is removed.
For making agricultural run-off draining flow velocity slow down, increase its hydraulic detention time in channel, the present invention utilizes sewage disposal skillGallery principle in art, bottom plate hole adopts " S " type to be laid staggeredly. " S " type by bottom plate hole is laid, and it is ripe that water plant reachesAfter date, by plant blocking function, can effectively promote particle precipitation, and then greatly increase the removal of ADSORPTION STATE nitrogen phosphorus, and haveEffect ground has coordinated plant root to secrete the absorption of oxygen system, absorption, aerobic-anaerobic effect. In addition, reasonably furrow bank, bottom of trench are aquaticPlants configuration, can also form good ecoscape, and can produce corresponding economic well-being of workers and staff according to kind difference.
Beneficial effect of the present invention:
A kind of agricultural ecological interception irrigation canals and ditches that adopt bulkhead tech of the present invention, ditch body structure stability substantially can reach facility grainfield and buildIf concrete irrigation canals and ditches structural strength, can effectively tackle particularly suspension, the nitrogen phosphorus etc. in the draining of nonirrigated farmland of farmland simultaneously. ThisBrightly have that Stability Analysis of Structures, pollutant interception result are good, construction costs and the advantage such as maintenance cost is low, landscape effect is good, have goodGood application value.
A kind of agricultural ecological interception irrigation canals and ditches that adopt bulkhead tech of the present invention, have following features: the one, and structure is comparatively firm, canEffectively resist the water erosion that rainfall and the draining of irrigation canals and ditches bottom cause, and then greatly reduce later maintenance administrative expenses; The 2nd, diameterStream draining pollutant can play effective interception function, and the interception rate of nitrogen is about 45-55%, and the interception rate of phosphorus is 50-65%,Especially can reach more than 90% particle in water (SS) interception rate; The 3rd, because this invention is based on original farmland ditch transformation,Reached the object not occupying cultivated land, engineering cost is low, it is simple and easy to operate, and is particluarly suitable for Taihu Lake basin and even east China PlainRiver Network large scale application.
Brief description of the drawings
Fig. 1 is the schematic cross-sectional view of agricultural ecological interception irrigation canals and ditches of the present invention;
Fig. 2 is the trench floor structural representation of agricultural ecological interception irrigation canals and ditches of the present invention;
Fig. 3 is the schematic diagram of the ditch wall panel structure of agricultural ecological interception irrigation canals and ditches of the present invention;
Fig. 4 is the gallery of the agricultural ecological of the present invention interception irrigation canals and ditches schematic diagram that bears down on one;
Fig. 5 is the controlled flashboard schematic diagram of water outlet of agricultural ecological interception irrigation canals and ditches of the present invention;
Fig. 6 is the section design sketch of agricultural ecological interception irrigation canals and ditches of the present invention.
In figure: 1, ditch wallboard 2, trench floor 3, three-dimensional plant net 4, emptying gate 5, bar-mat reinforcement6, ditch wallboard top reinforcing bar exceed that part 7, gallery bear down on one 8, field face 9, plain concrete bed course10, farmland soil 11, compacting soil 12, circular opening
Detailed description of the invention
Embodiment 1
This application test engineering is positioned at Jing Hua village, Lian Tang town, Qingpu district (E120.998 °, N30.963 °), coupling farmlandFor rice terrace, the degree of non-point source pollution is comparatively serious, and original escape canal is simple and easy Tu Gou, has impeded drainage, dry field difficultyEtc. outstanding problem. Thus, based on the requirement of the blue or green western Farmland water drainage prevention against water-logging of Upper Reaches of Huangpu River, the technology providing according to the design ginsengNumber is transform as the agricultural ecological interception irrigation canals and ditches that have the prevention waterlogging stagnant function of row and ecological intercepting function concurrently.
As shown in Figure 1, the ditch body cross section of agricultural ecological interception irrigation canals and ditches is inverted trapezoidal, and ditch wallboard 1 and the trench floor 2 of both sides are equalFor Prefabricated porous plate, between ditch wallboard and the soil body, set up one deck three-dimensional plant net 3, the destruction of causing to reduce water erosion, increasesStrong ditch body structure stability. Ditch body cross dimension is: upper wide 1.5m, and lower wide 0.5m, ditch depth 1.0m, superelevation 0.2m is (The gallery at irrigation canals and ditches top 7 height that exceed field, farmland face 8 that bear down on one). Three-dimensional plant net model is EM2, wide 1.0m, and three-dimensional is plantedThe gallery that when thing net 3 is laid, its upper end some (about 100mm) stretches into furrow bank top bears down on one below 7.
As shown in Figure 2, bottom of trench prefabricated board is rectangle, and concrete (C20) system, is of a size of 500mm × 1200mm, thickness of slab40mm, lays HPB300 level hot-rolled reinforced bar net (Φ 4mm) in it. Circular base plate hole on trench floor is " S " type to be laid, singlePlate arranges 5 circular opening 12(D150mm), plantation wild rice stem in hole, it is large that this plant has phytomass, and nitrogen phosphorus absorbsEfficiency advantages of higher.
As shown in Figure 3, furrow bank prefabricated board is rectangle, and concrete (C20) system, is of a size of 600mm × 1200mm, thickness of slab40mm, lays HPB300 level hot-rolled reinforced bar net (Φ 4mm) in it. Ditch wallboard adopts parallel apart from the above part of bottom 0.45mUniform hole mode, veneer arranges 12 circular openings (D100mm), and when construction, ditch wallboard lower end has one section to want dark by bottomEnter below trench floor, as shown in Figure 1, ditch wallboard bottom rides against on plain concrete bed course 9, the rear ditch wallboard basecoat of having constructedHole is 0.25m apart from the vertical range of bottom of trench. In the circular opening 12 of bottom, adopt the plantation of turf transplanting mode at ditch wallboardBermudagrass grass, and the rye grass of replaying in the winter time.
As shown in Figure 3, Figure 4, it is 100mm left and right that ditch wallboard top have one section of reinforcing bar to exceed partly to exceed concrete length,Ditch wallboard top reinforcing bar exceeds gallery that part 6 stretches into furrow bank top 7 inside of bearing down on one.
As shown in Figure 5, the emptying gate 4 of manual controlled different water levels is set in the water side of irrigation canals and ditches, when controlling different rainfallThe holdup time of section agricultural run-off draining in ecological intercepting irrigation canals and ditches, and simple to operate, be convenient to promote.
In addition, be provided with board plug type coarse rack at the water inlet end of ecological intercepting irrigation canals and ditches, be of a size of 500mm × 900mm. In addition alsoBe provided with other auxiliary equipment such as guidance tape, bottom of trench downflow weir.
The present embodiment is applied the effect that agricultural ecological interception irrigation canals and ditches of the present invention reach: one, structure is comparatively firm, can effectively resistThe water erosion that rainfall and the draining of irrigation canals and ditches bottom cause, reduces later maintenance administrative expenses greatly; Two, to runoff draining pollutantCan play effective interception function, agricultural drain pollutant load has a larger difference according to crop growth period is different, the blocking of nitrogenThe rate of cutting is 45-55%, and the interception rate of phosphorus is 50-65%, but in draining, particle (SS) interception rate all can reach more than 90%; ThreeBe based on the transformation of original farmland ditch, reached the object not occupying cultivated land, engineering cost is low, it is simple and easy to operate.
Embodiment 2
This application test engineering is positioned at Modern Agricultural Park, Qingpu, Shanghai City (E121.029 °, N30.966 °), and coupling farmland isRice terrace, the degree of non-point source pollution is comparatively serious, and original escape canal is to damage serious " three light " whole concrete irrigation canals and ditches, nothingEcological purification function. Thus, based on the requirement of the blue or green western Farmland water drainage prevention against water-logging of Upper Reaches of Huangpu River, the technology providing according to the designParameter is transform as has the stagnant agricultural ecological interception irrigation canals and ditches with ecological intercepting function of prevention waterlogging row concurrently.
As shown in Figure 1, the ditch body cross section of agricultural ecological interception irrigation canals and ditches is inverted trapezoidal, and ditch wallboard 1 and the trench floor 2 of both sides are equalFor Prefabricated porous plate, between ditch wallboard and the soil body, set up one deck three-dimensional plant net 3, to strengthen ditch body stability. Ditch body cross sectionBe of a size of: upper wide 1.5m, lower wide 0.5m, ditch depth 1.0m, superelevation 0.15m. Three-dimensional plant net model is EM3, wide 1.0mThe gallery that furrow bank top is stretched in the upper end of three-dimensional plant net 3 some (100mm left and right) bears down on one below 7.
As shown in Figure 2, Figure 3, Figure 4, material, size and the laying method of bottom of trench, furrow bank prefabricated board, and perforate on plateMode, pore quantity, big or small the same manner as in Example 1. Trench floor circular opening " S " type is laid staggeredly, plantation yellow flag in hole,Have phytomass large, nitrogen phosphorus absorbs the advantages such as pipette is large, and landscape effect is good. Ditch wallboard is (more than the 0.45m of bottom) in middle and upper partParallel uniform circular opening, adopts turf transplanting mode plantation bermudagrass grass, and the rye grass of replaying in the winter time.
As shown in Figure 5, be provided with board plug type coarse rack at the water inlet end of ecological intercepting irrigation canals and ditches, be of a size of 500mm × 920mm,Water side is provided with the emptying gate 4 of manual controlled different water levels, and other is auxiliary to be also provided with guidance tape, bottom of trench downflow weir etc. in additionHelp facility.
The present embodiment is applied the effect that agricultural ecological interception irrigation canals and ditches of the present invention reach: one, structure is comparatively firm, can effectively resistWater erosion, and then greatly reduce later maintenance administrative expenses; Two, can play effective interception to runoff draining pollutant doesHave larger difference according to crop growth period is different with, agricultural drain pollutant load, the interception rate of nitrogen is 45-55%, the blocking of phosphorusThe rate of cutting is 50-65%, but particle (SS) interception rate all can reach more than 90%; Three, based on original farmland ditch transformation, reachThe object not occupying cultivated land, engineering cost is low, it is simple and easy to operate.

Claims (10)

1. agricultural ecological interception irrigation canals and ditches that adopt bulkhead tech, the water inlet end of irrigation canals and ditches is provided with grid, and water side is provided with controlled rowSluice gate, ditch body cross section is inverted trapezoidal, it is characterized in that: it is to transform and form on the basis of original simple and easy soil property irrigation canals and ditches;Bottom of trench and furrow bank have all been laid Prefabricated porous plate, in the porous plate hole of bottom of trench, furrow bank both sides, have planted water plant; Furrow bank twoSide, below Prefabricated porous plate, is also close to the compacting soil body and has been laid one deck three-dimensional plant net; Utilize the gallery in sewage disposal technologyPrinciple, the hole on bottom of trench Prefabricated porous plate adopts " S " type to be laid staggeredly; Furrow bank Prefabricated porous plate is reserved one section highly not in bottomPerforate, on it, part adopts the mode perforate of parallel uniform hole; In the porous plate hole of bottom of trench, furrow bank both sides, plantation is aquaticPlant, select phytomass large, to the perennial water plant in the large this locality of demanding volume of nitrogen and phosphorus.
2. the agricultural ecological of employing bulkhead tech as claimed in claim 1 interception irrigation canals and ditches, is characterized in that: described ditch body is cross-sectionFace is of a size of: upper wide 1.5m, lower wide 0.5m, ditch depth 1.0m.
3. the agricultural ecological of employing bulkhead tech as claimed in claim 1 or 2 interception irrigation canals and ditches, is characterized in that: bottom of trench, ditchWall prefabricated board thickness is all not less than 40mm, lays bar-mat reinforcement in it; Furrow bank Prefabricated porous plate is apart from the above part of bottom 0.45mAdopt parallel equal mode for cloth perforate.
4. the agricultural ecological of employing bulkhead tech as claimed in claim 3 interception irrigation canals and ditches, is characterized in that: furrow bank prefabricated board topEnd has one section of reinforcing bar to exceed part to stretch into the gallery inside of bearing down on one; There are a bit of going deep into below trench floor, furrow bank in furrow bank prefabricated board lower endPlate bottom is placed on the plain concrete bed course below trench floor; The gallery that three-dimensional plant holds some to stretch into furrow bank top on the net bears down on oneBelow.
5. the agricultural ecological of employing bulkhead tech as claimed in claim 4 interception irrigation canals and ditches, is characterized in that: in trench floor holeThe perennial water plant wild rice stem in this locality or yellow flag that planting plants amount is large, demanding volume of nitrogen and phosphorus is large; Furrow bank plate holes adopts turf to moveThe mode of planting is planted bermudagrass grass, the rye grass of replaying winter.
6. the agricultural ecological of employing bulkhead tech as claimed in claim 5 interception irrigation canals and ditches, is characterized in that: bottom of trench prefabricated board isRectangle, is of a size of 500mm × 1200mm; Furrow bank prefabricated board is rectangle, is of a size of 600mm × 1200mm.
7. the agricultural ecological of employing bulkhead tech as claimed in claim 6 interception irrigation canals and ditches, is characterized in that: on monolithic trench floorArrange 5 and be the circular opening that " S " type is laid, each Circularhole diameter is 150mm; On monolithic ditch wallboard, arrange 12 parallel allThe circular opening of cloth, each Circularhole diameter is 100mm.
8. the agricultural ecological of employing bulkhead tech as claimed in claim 7 interception irrigation canals and ditches, is characterized in that: three-dimensional plant net typeNumber be EM2; The grid of the water inlet end setting of irrigation canals and ditches is board plug type coarse rack.
9. a construction method for the agricultural ecological interception irrigation canals and ditches of the employing bulkhead tech as described in as arbitrary in claim 1-8, its spyLevy and be: first according to the anti-stagnant requirement of water drainage and local agricultural drain feature, determine the cross sectional dimensions of irrigation canals and ditches, rebuild or newly openDitch body, arranges grid at the water inlet end of irrigation canals and ditches, and water side arranges controlled emptying gate; Secondly want according to the design of engineering structure mechanicsPoint, guarantees the steadiness of ditch body: furrow bank, on the basis of soil body compacting, is adjacent to and lays one deck three-dimensional plant net, at three-dimensional plantAdd a cover Prefabricated porous plate on the net; Utilize the gallery principle in sewage disposal technology, trench floor adopts the staggered perforate mode perforate of " S " type;Ditch wallboard is reserved one section of highly not perforate in bottom, and on it, above part adopts the perforate of parallel uniform hole mode; The 3rd considers ditchThe ecological property of canal: be this locality unboiled water for many years that in the hole of " S " type arrangement, planting plants amount is large, demanding volume of nitrogen and phosphorus is large on trench floorRaw plant; Planting aquatic plants in parallel uniform hole on ditch wallboard.
10. the construction method of the agricultural ecological of employing bulkhead tech as claimed in claim 9 interception irrigation canals and ditches, is characterized in that:Comprise the steps:
(1) determine that ditch body cross dimension is: upper wide 1.5m, lower wide 0.5m, ditch depth 1.0m; Rebuild or newly ditch by sizeBody, and build plain concrete bed course in lower end, bottom of trench both sides;
(2), according to irrigation canals and ditches length and the furrow bank both sides gross area, calculate and buy required three-dimensional plant net E2;
(3) bottom of trench prefabricated board customized: rectangle, be of a size of 500mm × 1200mm, thickness of slab 40mm, lays reinforcing bar in itNet, opens 5 and is the circular opening diameter 150mm that " S " type is laid on plate; Furrow bank prefabricated board customized: rectangle, is of a size of600mm × 1200mm, thickness of slab 40mm, lays bar-mat reinforcement in it, and the reserved one section of reinforcing bar in top bears down on one and is connected use with gallery,Apart from separately 12 parallel uniform circular opening diameter 100mm of the above portion of bottom 0.45m;
(4) furrow bank, on the basis of soil body compacting, is adjacent to and lays one deck three-dimensional plant net, and three-dimensional plant holds some to stretch on the netEnter on the gallery at furrow bank top;
(5), at the online bedding furrow bank of three-dimensional plant Prefabricated porous plate, ditch wallboard bottom is placed on plain concrete bed course; Ditch wallboard top is pre-The reinforcing bar staying stretches on the gallery on the ditch ridge, and lays vertical reinforcement, then at gallery upper cement, forms gallery and bears down on one, ditchThe reserved reinforcing bar in wallboard top stretches into the gallery inside of bearing down on one;
(6) lay bottom of trench Prefabricated porous plate at bottom of trench, furrow bank prefabricated board lower end has a bit of below trench floor;
(7) on trench floor, be in the hole that " S " type arranges and plant wild rice stem or yellow flag; Parallel uniform hole on ditch wallboardInterior employing turf transplanting mode plantation bermudagrass grass, the rye grass of replaying winter.
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