CN1080354C - Water drainage method and belt drainage component used therein - Google Patents
Water drainage method and belt drainage component used therein Download PDFInfo
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- CN1080354C CN1080354C CN 97115515 CN97115515A CN1080354C CN 1080354 C CN1080354 C CN 1080354C CN 97115515 CN97115515 CN 97115515 CN 97115515 A CN97115515 A CN 97115515A CN 1080354 C CN1080354 C CN 1080354C
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- discharge member
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The present invention relates to a draining method. A draining belt of which at least one surface has a plurality of minor-diameter water collection and draining slots is buried and arranged an earth layer about to discharge water, wherein the minor-diameter water collection and draining slots are arrayed in parallel in a density mode and extend along the full length of a belt body, and the slot openings form capillary gaps; the capillary function of the slot openings is utilized for sucking the moisture in soil into the minor-diameter water collection and draining slots, and the moisture is absorbed, collected and discharged by siphon force generated by the fall of the water level of both ends or any section of the slots; the material of a used draining member is a flaky long belt body, a plurality of narrow water collection and draining slots which are densely arrayed at intervals along the direction of the belt width and extend along the direction of the belt length by full length are formed on at least one surface of the flaky long belt body, the shape of each slot opening forms a capillary gap, and each ditch part forms an expanded cross section of a small circular hole.
Description
Technical field
The present invention relates to a kind of novel water discharge method, particularly a kind of water and soil conservation that is applicable to hillside, the water discharge method of the drainage system of agro-industrial, civil engineering and be used in the high compressive resistance of having of this and the laminar draining band of flexibility of high suction water efficient.
Background technology
The existing water and soil conservation that is used for hillside, the sub-irrigation draining in farming garden, the tunnel roadbed, permeable and the water discharge member material of the draining of civil engineerings such as retaining wall etc., the most frequently used is tubulose, be so-called water-permeable pipe or gutter, its basic structure is to be offered many tiny seams hole at the above circumference of the first half at least two of pipe body/one and gathers as guiding principle eye shape, arrive the water collecting part of managing interior Lower Half atresia in order to the seepage water of assembling in the earthing, flow out along the pipe longitudinally again, because infiltration is the Lower Half that the gravity of utilized head and water makes the downward flow ipe of water, must relatedly bring tiny sandy loam particle into the guiding principle eyelet, accumulate over a long period, must seal the guiding principle eye gradually and result in blockage then, simultaneously, the sandy loam particle that enters in the pipeline no doubt partly can discharge with the water that penetrates in the pipe, but because of collecting water from runoff in managing is few, outflow velocity is low, most of sandy loam particle will be deposited on the pipeline Lower Half, permanent accumulation also causes in the pipe and stops up, the drawback that displacement reduces.For preventing the obstruction of guiding principle eye, have and be coated with adhesive-bonded fabric coating or synthetic fibers gauze etc. in the outside of gutter and constitute multiple field water-permeable pipe or gutter as filtration beds, therefore in fact also can only reach the effect of life-saving, wait that filtration beds is for years still can be stopped up.In addition, this kind gutter adopts hard plastic to make more, and is inconvenient in the burial and construction operation.Moreover the total area ratio caliber basal area (water flowing basal area) of the set guiding principle eyelet as the inlet opening of gutter side face unit area differs greatly, and actual displacement is less than 1/3rd of its basal area, so can not there be siphonage to produce in the gutter; If with the close guiding principle eyelet of establishing of the side face of pipe, then the compressive resistance of gutter subtracts greatly, and hard to bear soil pressure and vehicle weight easily cause distortion even crushed, and cause guiding principle eye or line clogging.
Flexible flexible for gutter is had with convenient construction, disclosed and used PVC lining helical spring guiding principle line, the soft flexibility water-permeable pipe that multiple materials such as adhesive-bonded fabric pipe and nylon yarn are made, but above-mentioned guiding principle eye stops up and the problem of compressive resistance still exists.
Other also have the periphery that is disclosed in the hard plastic gutter to form spiral goove, and the guiding principle eye then is located in the ditch, by means of this with intensity that increases body and the water-taking efficiency that promotes the guiding principle eye.
Also disclose a kind of draining sheets of non-tubular shape, having only this kind draining band is to be coated with felt shape non-woven cloth layer on the concavo-convex support surface with the hard plastic moulding and to constitute.Support also has the two sides to form groove, has only the notch of its groove to be wider than bottom land.
Summary of the invention
The present invention aim to provide a kind of on structure, shape and principle the different novel water discharge members that give above-mentioned various gutter and draining sheets, have the big displacement of high water absorbing capacity, and withstand voltage, never stop up, be suitable for various drainage systems.
Main purpose of the present invention is to provide a kind of water discharge method, utilization be embedded in the earthing on the thin ribbon shaped water discharge member surface the close finedraw shape notch setation spy of institute who establishes the path collection draining slotted eye that extends longitudinally in order to contained humidity in the earthing is sucked in the slotted eye, and by means of the height of water Duan Suosheng siphon power of the two ends of slotted eye or arbitrary section to promote suction and to be compiled and discharge from an end of slotted eye.
Another object of the present invention is to provide a kind of above-mentioned water discharge method, the notch faced downwards of the collection draining slotted eye of its water discharge member, slotted eye not only capillarity can be intake on the one hand, can not return leakage with the hydraulic pressure in the supporting slotted eye by means of the surface tension of water that thin narrow notch produces on the other hand, simultaneously by means of by drop Duan Suosheng siphon power, water is compiled discharge, stop up the slotted eye drawback because of gravity sinks to assembling because notch, can effectively prevent the sand particulate down.
Another purpose of the present invention is to provide a kind of water discharge method, between earthing or stratum and permeability structure wall or metope, bury underground so that one side is close and be provided with longitudinally that total length is extended and notch can produce the banded water discharge member of capillary fine pore collection draining slotted eye, making it have the one side that collects the draining slotted eye connects airtight in earthing or stratum, another side does not promptly have the one side that collects the draining slotted eye and then connects airtight in structure wall or metope, and enter in the slotted eye by means of capillarity moisture in notch suction soil layer, and give birth to siphon power by means of the height of water at slotted eye two ends and the water in the slotted eye is compiled and discharge, do not penetrate into structure wall or metope by means of the face that does not have collection draining slotted eye with the water in the isolated soil simultaneously.
A further object of the present invention is to provide a kind of water discharge method, the long belt body of thin slice that it adopts weatherability, thermoplastic synthetic resin moulding to form, its at least mask multiple tracks is arranged along bandwidth direction at interval dense arrangement and the tiny collection draining slotted eye that extends along belt length direction total length, its notch forms can produce capillary thin narrow slot completely, the ditch portion of the small sircle hole section that then form to enlarge in the hole is in order to compiling and discharging water in the inlet hole.
Another purpose of the present invention is to provide a kind of water discharge method, and water discharge member wherein can use as the water-proof film of basement, the construction of tunnel water discharge member of holding concurrently.
Another object of the present invention is to provide a kind of water discharge method, water discharge member wherein, and its one side of not establishing collection draining slotted eye is the plane that forms tabular surface or have multiple tracks reinforcement rib.
Another purpose of the present invention is to provide a kind of water discharge method, water discharge member wherein, and it forms smooth one side is to be provided with one in order to the anti-soil pressure of increase water discharge member and the reinforcement members of shape-retaining ability.
A further object of the present invention is to provide a kind of water discharge method, water discharge member wherein, and its one side with slotted eye is to be covered with the adhesive-bonded fabric filter material.
Another purpose of the present invention is to provide a kind of water discharge method, and water discharge member wherein is easy to use, and material stores transportation and do not take up space, and of many uses, and can anti-long-term use.
Summary of the invention
A kind of water discharge method, be used for the moisture absorption in the soil layer is compiled and discharged the outside of soil layer, it is characterized in that: it is a capillarity of utilizing the close finedraw notch of establishing the many tiny bore collection draining slotted eye that gos deep into water discharge member inside and longitudinally extend in parallel of at least one surface institute of the banded water discharge member be embedded in the earthing to be produced, so that the moisture in the earthing is sucked in the slotted eye, and give birth to siphon power by means of the two ends of collection draining slotted eye or arbitrary section the height of water, the water that sucks compiled when promoting suction low side discharge from slotted eye.
Other purposes of the present invention, effect and characteristics can be aided with accompanying drawing and can be obtained further understanding by following specific embodiment explanation.
Brief description
Fig. 1 is the phantom drawing of water discharge member first embodiment of the present invention;
Fig. 2 is the phantom drawing of water discharge member second embodiment of the present invention;
Fig. 3 is the phantom drawing of water discharge member the 3rd embodiment of the present invention;
Fig. 4 (a) and (b), (c) are the modified example elevations of the additional reinforcement section bar of water discharge member of the present invention;
Fig. 5 is the elevation of water discharge member the 4th embodiment of the present invention;
Fig. 6 is the device schematic diagram of water discharge member experimental example 1 of the present invention and 2;
Fig. 7 is the device schematic diagram of water discharge member experimental example 3 of the present invention;
Fig. 8 (A) and the slotted eye portion that (B) represents water discharge member respectively upwards and the partial enlarged drawing when downward illustrate its suction water principle.
The specific embodiment
Fig. 1 blocks the phantom drawing of a joint for an embodiment's of water discharge member of the present invention with regard to length direction; Symbol 1 is the long band shape water discharge member of tabular for section, this water discharge member 1 adopts the flexual belt body that has that the thermoplasticity molding synthetic resin of tool weatherabilities such as PVC, PE, PP forms, the one mask has multiple tracks along horizontal cross direction dense arrangement and the tiny collection draining slotted eye 2 that extends along the parallel total length of longitudinally at interval, the notch 21 of slotted eye 2 forms and can produce capillary thin narrow slot completely, toward the small sircle hole ditch portion 22 that interior connection section enlarges; Another side then forms smooth surface 3.So, integral body is to form a slice two sides in fact all to be the plane and can be rolled into winding as a cloth, and can be cut to suitable length according to need and use.By notch 21 is to form to utilize the water entering section of capillarity with suction, and then formation is in order to catchment and the channel of draining in ditch portion 22, and its action principle describes in detail hereinafter.
Fig. 2 is second embodiment of water discharge member of the present invention, the long belt body of tabular that this water discharge member 1A still adopts the thermoplastic synthetic resin moulding to form with first embodiment basically equally has only its upper and lower surface all to be formed with first embodiment and constructs identical collection drain hole 2.In the present embodiment, the collection drain hole 2 on draining band 1A two sides keeps same pitch (pitch) relative up and down, but as adopts the shape that staggers up and down also can.
Fig. 3 has high anti-soil pressure intensity for the 3rd embodiment of water discharge member of the present invention for making soft flexibility water discharge member, is pasted with the reinforcement section bar 4 of hard plastics moulding at the tabular surface 3 of the water discharge member 1 shown in the 1st figure.This section bar 4 adopts simple U section bar in the present embodiment, but also can adopt the U section bar 4A that has many ribs in the U type groove for example, or type tubing 4B, or other section bar 4C that are fit to, shown in Fig. 4 (a) and (b), (c).
Fig. 5 is the 4th embodiment of water discharge member of the present invention, and the one side of water discharge member 1 is pasted with hard plastic system reinforcement section bar 4 in the 3rd embodiment, but present embodiment is then direct and water discharge member 1 is one-body molded with the reinforcement part.The reinforcement part that shows among the figure is divided into many high and low ribs 41,42 that extend along lengthwise, but can do many variations.And the one side with collection drain hole 2 of above-mentioned draining band 1 also can add in case of necessity and cover adhesive-bonded fabric, nylon yarn etc. as filter material.(experimental example 1)
Draining band 1 with above-mentioned first embodiment, get a length of a film 35cm * wide 5cm * wide 0.3cm one mask pitch-row 1.2mm is arranged, totally 40 road notches 21 width 0.15mm, the collection drain hole 2 of slotted eye 22 diameter 0.9mm, sealing back, the inner of draining band 1 with one side with slotted eye upwards and the inner be embedded in the interior bottom of acryl perspex container made 5 of wide 30cm * long 30cm * high 20cm with being higher than the about 1cm in outer end, make the outer end of draining band expose about 6cm as shown in Figure 6, be equipped with in the container 5 that earth and river sand mix with 2 to 1 ratio and the sand that flattens slightly to the 15cm height, 5cm height on the remaining native face, on the remaining native face with high topped up with water 30 * 30 * 5=4500cc of 5cm, through 2 minutes (permeability rate on earth is decided), water promptly flowed out from the draining band port of export.
Observe its water outlet situation, nearly 2/3rds slotted eye flows out water, and its current situation is the continuous or interrupted water column shape in tankful hole, the water that this expression sucks by means of capillarity from notch, owing to the difference of soil property each several part density and permeability rate have before and after and the part enter and discharge after catchmenting into one section water column in the slotted eye, when this moment, water column flowed toward the port of export by means of head fall, its rear produces the vacuum draw effect, and another section water column that catchments in the rear portion is also driven forward, promptly produce siphonage, and the water that will enter in the slotted eye constantly aspirates, and then promotes capillarity and reach high water absorbing capacity and good drainage effect.Slotted eye as for about 1/3rd only flows out and promptly stops on a small quantity or do not flow out water, this is to suck discharge because infiltrate into the penetration quantity not sufficient of lower floor from the earth upper strata for the whole conduits of this draining band, in other words, because of the water absorption rate of draining band excellent, this is tested the used sand and the water yield, only use draining band promptly more than sufficient with 25～30 road collection draining slotted eyes.(experimental example 2)
With draining band 1 reverse side of experimental example 1, be about to one of grooved hole 2 and face down and be embedded in the same position of container 5, other conditions are identical with experimental example 1.After the container topped up with water 4500cc, after about two minutes 5 seconds, water promptly flows out from the draining band port of export.Current still are continuous or interrupted water column shape as experimental example 1 and carry about 2/3rds slotted eye 1 and flow out.Observe its water outlet situation than the situation of experimental example 1 continuously and flow velocity very fast, this can be when filling with the container of 500cc and 1000cc capacity after beginning water outlet certainly, experimental example 2 required time t2 wanted short number ten seconds to several minutes than experimental example 1 required time t1, can know this by inference is because draining band reverse side is when using, because slotted eye top is airtight, not with the siphonage effect of the air communication De Gengjia in sand gap.(experimental example 3)
The draining band 1 of experimental example 1 is prepared two 1a, 1b and existing one section of gutter 1c (diameter 2cm * length 32cm), 2/3 side face of gutter is provided with many apertures, water permeable area is 70cm/m, be embedded in the said vesse 5 with same gradient (1/30) respectively, draining band 1a faced downwards, 1b faces the top, then atresia portion is below for gutter 1c, as shown in Figure 7, topped up with water approximately after 2 minutes water promptly flow out from draining band 1a, 1b and gutter 1c respectively, observe its flow velocity, draining band 1a, 1b are than gutter 1c rapidly.From beginning water outlet after 2 minutes, the water outlet of gutter 1c decrescence, just stop to 3 fens its flowing water of half, but draining band 1a, 1b then still keep identical water outlet, but draining band 1b water yield is also decrescence after 3 fens halfs, to 4 fens halfs, stop water outlet, draining band 1a then continues water outlet, stops water outlet after about 30 minutes, this moment, earth reached saturation moisture content substantially, and the earth top has not had water level.
Can find out that by above-mentioned experimental result draining band of the present invention has powerful water absorption rate and drainage effect, therefore after head pressure gradually falls, percolating water has the tendency of gradually past draining band 1a, the particularly ventricumbent draining band of 1b 1a side seepage flow in the sand, through deduction be because of the water absorption rate of traditional gutter lower, percolating water toward because of having the high draining band seepage flow of capillary and siphonage water absorption rate, supplies the particle gap of percolating water seepage flow gradually to form due to the percolating water stream that easily is guided to the draining band and make naturally in the sand.In a single day this kind water route forms, and the major part of percolating water will be toward this flowing water, and therefore after head pressure lowered, the gutter 1c that water-taking efficiency is low promptly stopped draining, and that continue is draining band 1b, just is draining band 1a at last.
The suction water efficient of draining band 1a of the present invention, 1b is run well than traditional draining, same again draining band 1a, the 1b person of facing down be counter to be understood the specific surface person of making progress water absorption rate and will get well, this is surprising maximum discovery the in this experiment, and the modern partial enlarged drawing that reaches (B) by means of Fig. 8 (A) is illustrated.Shown in figure (A), because the notch 21 of collection draining slotted eye 2 upwards, the sandy loam P1 that has larger particles unavoidably builds up gradually above notch 21 parts, cause the local obstruction of notch, but because of notch is a longitudinal extension, the indivedual guiding principle eyelets that suitable spacing is arranged like general gutter easily do not stop up, so still have suitable length or many notches that is connected to draw percolating water by means of capillarity, simultaneously by means of institute's siphonage that produces promotion draining in the slotted eye, the result has excellent suction water efficient than the gutter of gravity feed that only depends on head and water and draining.Enter fine particle sandy loam P2 in the slotted eye 22 from thin narrow notch 21 again, because of the space increase suddenly and because of institute's siphonage of giving birth in the hole very easily with water outflow, unlikely obstruction.
The situation that Fig. 8 (B) expression notch 21 is downward, in this case, notch 21 can be by means of head pressure and capillarity water inlet, because above the draining band 1 is airtight, and downward because of notch 21, big or small sandy loam particle P1, P2 be because of the downward sedimentation of gravity, unlikely gathering and enter notch and stop up, only have TDS to enter in the slotted eye 22 with water, this TDS is then water-soluble and discharge with water.Very narrow because of notch again, under static state, surface tension do not return leakage by means of can supporting the hydraulic pressure in the slotted eye completely, and the airtight air of end face is difficult to enter, and more is easy to generate the vacuum state that siphonage is given birth to slotted eye inside, so inhale, the drainage efficiency inverse ratio notch person of making progress is good.In addition,, cause the sandy loam inter-granular porosity bigger, further increase the permeability rate of sandy loam, and cause and be easy to water wave or the permeation pathway compiled toward the draining band, and improve drainage efficiency biglyyer because TDS is constantly discharged with water.Same experiment is carried out under the condition of different soil properties, the water yield and different existing gutter, also obtains akin result, and draining band promptly of the present invention is better than traditional gutter, and the downward person of notch is better than notch upwards or to other direction persons.
Again, when the water content of sandy loam reaches capacity and the draining band has stopped the situation of draining, when exerting pressure on sandy loam, water is discharged again, and sandy loam humidity is reduced, and hardness increases.If when imposing vibration, situation is also identical.
In sum, water discharge member of the present invention not only utilizes capillarity to add siphonage and can reach high suction and drainage effect; Also, make things convenient for transportation, construction and withstand voltage, allow, save construction cost having only thin earthing or not having gravity spreading under the situation of earthing because of constituting flexual bandlet shape; Again under soil reaches situation more than the saturation moisture content, if through gravity pressurization or roll extrusion (as pedestrian or vehicle etc.), promptly can make soil liquefaction and become mud, but use this water discharge member then still can continue draining and soil is hardened immediately, so be very beneficial for constructing; Simultaneously, this water discharge member is made with complete fluid-tight plastic cement, if the one side that it is smooth is affixed on the wall surface that contacts with soil of basement or construction of tunnel by means of adhesive, then can be as the waterproof film draining band of holding concurrently, and reach the dual purpose of when preventing to penetrate into the wall inner face water in the soil being discharged.Can be rated as one and have novelty and can be for the water discharge member of agro-industrial, building drainage system and other drainings use of many uses.
More than be illustrated with regard to specific embodiments of the invention, under the situation of not violating the present invention's spirit and principle, ripely be skilled in this skill person and still can do all modifications and change, all this when being considered as belonging in the scope that this case claim comprised, give statement this spy.
Claims (10)
1. water discharge method, be used for the moisture absorption in the soil layer is compiled and discharged the outside of soil layer, it is characterized in that: the capillarity of utilizing the close finedraw notch of establishing the many tiny bore collection draining slotted eye that gos deep into water discharge member inside and longitudinally extend in parallel of at least one surface institute of the banded water discharge member be embedded in the earthing to be produced, moisture in the earthing is sucked in the slotted eye, and give birth to siphon power by means of the two ends of collection draining slotted eye or arbitrary section the height of water, the water that sucks compiled when promoting suction low side discharge from slotted eye.
2. water discharge method according to claim 1, it is characterized in that: the banded water discharge member that is embedded in the earthing is to bury underground towards the below of earthing with the close one side that is provided with collection draining slotted eye, and suck moisture in the earthing from bottom to top by means of the capillarity of notch, and by means of advancing the hydraulic pressure of water in the slotted eye in the surface tension of the water that notch produced with supporting and do not return leakage, utilize the drop of slotted eye to give birth to siphon power simultaneously and water is compiled and discharge.
3. water discharge method according to claim 1, it is characterized in that: banded water discharge member is to connect airtight in earthing or stratum with the close one side that collects the draining slotted eye that is provided with, another side promptly do not have establish the one side that collects the draining slotted eye then connect airtight in structure wall or metope be embedded between earthing or stratum and permeability structure wall or the metope, and enter in the slotted eye by means of capillarity moisture in notch suction soil layer, and give birth to siphon power by means of the height of water at slotted eye two ends and the water in the slotted eye is compiled and discharge, do not penetrate in the structure wall with the water in the isolated soil by means of the face that does not have collection draining slotted eye simultaneously.
4. water discharge method according to claim 1, it is characterized in that: used banded water discharge member is the thin slice ribbon-shaped members that adopts weatherability thermoplastic synthetic resin forming materials to form, the small-bore collection draining slotted eye that its at least one mask has multiple tracks to be spaced and to extend along belt length direction total length along bandwidth direction, the notch formation of the sensible outer gas of slotted eye is less than the slotted eye aperture and can produce capillary thin narrow slot.
5. water discharge method according to claim 4 is characterized in that: the one side of not establishing collection draining slotted eye of banded water discharge member forms tabular surface.
6. water discharge method according to claim 5 is characterized in that: the one side of not establishing collection draining slotted eye of banded water discharge member forms has many reinforcement ribs that extend longitudinally that are spaced.
7. water discharge method according to claim 5 is characterized in that: the one side of not establishing collection draining slotted eye of described banded water discharge member is pasted with the U type reinforcement section bar that has in the groove by the hard plastics moulding or do not have the reinforcement rib.
8. water discharge method according to claim 5 is characterized in that: the one side of not establishing collection draining slotted eye of described banded water discharge member is pasted with square type tubing by the hard plastics moulding as reinforcement members.
9. water discharge method according to claim 4 is characterized in that: described banded water discharge member has flexibility.
10. water discharge method according to claim 4 is characterized in that: the one side at least that described banded water discharge member is provided with collection draining slotted eye is coated with the adhesive-bonded fabric filtration members.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97115515 CN1080354C (en) | 1997-07-18 | 1997-07-18 | Water drainage method and belt drainage component used therein |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97115515 CN1080354C (en) | 1997-07-18 | 1997-07-18 | Water drainage method and belt drainage component used therein |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1206058A CN1206058A (en) | 1999-01-27 |
| CN1080354C true CN1080354C (en) | 2002-03-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97115515 Expired - Lifetime CN1080354C (en) | 1997-07-18 | 1997-07-18 | Water drainage method and belt drainage component used therein |
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| CN (1) | CN1080354C (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102182200A (en) * | 2011-01-11 | 2011-09-14 | 叶勇 | Draining prevention coiled material with ribbing hair |
| GB201113608D0 (en) * | 2011-08-05 | 2011-09-21 | Tarapaski William E | Apparatus and method for channelling groundwater |
| CN103088790B (en) * | 2011-10-27 | 2015-07-01 | 河南省电力勘测设计院 | Steel outlet for power plant circulating water and construction method thereof |
| CN102561280A (en) * | 2012-02-06 | 2012-07-11 | 古欣 | Quick drainage system utilizing capillary water permeating and draining belts and drainage method thereof |
| CN104594228A (en) * | 2015-01-14 | 2015-05-06 | 古辰智 | Water drain pipe and water drainage system comprising same |
| CN104831744A (en) * | 2015-04-14 | 2015-08-12 | 成都聚智工业设计有限公司 | Drain board structure |
| CN108797559A (en) * | 2018-07-23 | 2018-11-13 | 刘亚丁 | The active efficient discharging water blind pipe system in underground |
| CN111517573A (en) * | 2020-04-29 | 2020-08-11 | 贵州金农富平生态农牧科技有限公司 | Method and system for treating livestock breeding wastewater |
| CN112227504A (en) * | 2020-10-12 | 2021-01-15 | 湖南凡工建筑工程有限公司 | Connecting device for capillary permeable and drainage belt of asphalt highway |
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1997
- 1997-07-18 CN CN 97115515 patent/CN1080354C/en not_active Expired - Lifetime
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| Publication number | Publication date |
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| CN1206058A (en) | 1999-01-27 |
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