CN100458031C - City rainwater osmotic sewerage installation - Google Patents
City rainwater osmotic sewerage installation Download PDFInfo
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- CN100458031C CN100458031C CNB2006100483820A CN200610048382A CN100458031C CN 100458031 C CN100458031 C CN 100458031C CN B2006100483820 A CNB2006100483820 A CN B2006100483820A CN 200610048382 A CN200610048382 A CN 200610048382A CN 100458031 C CN100458031 C CN 100458031C
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Abstract
The present invention provides a city rainwater seepage drainage installation. It includes main pipe culvert, branch pipe, joint pipe and manhole, one end of said joint pipe is connected with water inlet, its another end is communicated with main pipe culvert by means of manhole, one end of the branch pipe is communication with said manhole, and another end of the branch pipe is communicated with main pipe culvert by means of manhole, under the manhole a seepage well is added, and the shaft body of said seepage well is formed from plastic disordered network frame.
Description
Technical field
The present invention relates to a kind of urban road storm-water drainage facility, especially a kind of city rainwater osmotic sewerage installation of below the urban road underground drainage facility, setting up negative well.
Background technology
In rainy season, particularly in flood season, the requirement of urban road rainwater subsurface disposal facility incompatibility heavy rain and heavy rain discharging is usually attacked by rainwater, and infringement urban facilities and resident living are disturbed normal working and learning.On the other hand, the urban water shortage of the northern area of China is comparatively serious, and growing urban population and limited urban size are enlarging, reduced the permeable area of urban surface, make to can not get effectively control after the underground water extraction and replenish, caused the underground lack of water in city and land subsidence.With regard to the storm-water drainage facility in its existing city, layout is reasonable inadequately, facility is aging to be stopped up, the requirement of incompatibility Modern Urban Development, and the main duct of its storm-water drainage facility, arm and connection pipe all adopt brick mix structure, have only discharge function, rainwater all directly is discharged among the rivers and lakes, the manhole that it disposed only is very shallow clear mud pit.This urban rainwater discharging facility is not that rainwater is all drained, and floods and the city owing to stopping up exactly, does not utilize rainwater resource well, comes supply urban groundwater source unable to make ends meet.Patent that CN2761722Y has invented a kind of " infiltration type urban rainwater discharging facility ", this patent is provided with groundwater reservoir, first sedimentation basin, second sedimentation basin and filtering ponds, and carry out disinfection, deodorizing, processing such as fine filtering, can directly supply the fire-fighting in city, environmental sanitation, water such as urban construction and gardens, it is a kind of urban sewerage and drainage flood control, the feasible method of groundwater recharge, but, this invention is at the underground groundwater reservoir that is provided with, first sedimentation basin, facilities such as second sedimentation basin and filtering ponds carry out water treatment, underground installation is comparatively complicated, inconvenient operation, and only depend on the bottom surface of negative well to seep water, unreasonable, the inventor designs a kind of urban rainwater discharging facility according to the layout setting of existing urban rainwater discharging facility.
Summary of the invention
The problem to be solved in the present invention is the infiltration emission problem of existing urban rainwater discharging facility, and purpose provides a kind of city rainwater osmotic sewerage installation.
The infiltration emission problem that the present invention solves above-mentioned urban rainwater discharging facility is on the basis of existing urban rainwater discharging facility, according to urban geology structure and underground water source situation, to set up the infiltration facility of infiltration function, a large amount of rainwater are stored in the negative well, replenish underground water source, its concrete technical scheme comprises main duct, arm, connection pipe and manhole, and an end of connection pipe is communicated with catch pit, and the other end is communicated with arm or main duct by manhole; One end of arm is communicated with manhole, and the other end is connected with the main duct by manhole, and its facility is that the motorway catch pit is connected with arm, drainage channel and main duct by negative well or manhole by the connection pipe; Its negative well be arranged on manhole below, its cylindrical shell is to be made of the unordered mesh skeleton of plastics; The cylindrical shell of its drainage channel and main duct is to be made of the unordered mesh skeleton of plastics.
Above-mentioned city rainwater osmotic sewerage installation, the cylindrical shell of described negative well, drainage channel and main duct are to be made of the unordered mesh skeleton of modified polypropene, polyethylene or igelite.
Above-mentioned city rainwater osmotic sewerage installation, the raw material proportioning of the unordered netted cylindrical shell of described modified polypropene is by weight: PP:80～120, HDPE:10～20, antioxidant 1010: 0.15～0.5, DLTP:0.1～0.3.
Above-mentioned city rainwater osmotic sewerage installation, the raw material proportioning of the unordered netted cylindrical shell of described modified poly ethylene is by weight: LDPE:88～116, DLTP:0.3～0.7, CaCO
3: 38～62, antioxidant 1010: 0.3～0.65.
Above-mentioned city rainwater osmotic sewerage installation, the raw material proportioning of the unordered netted cylindrical shell of described modified polyvinyl chloride is by weight: PVC:83～126, DOP:4～8, three salt: 2～6, PbSt:0.8～1.5, BaSt:0.6～1.2, paraffin: 0.6～0.8.
City rainwater osmotic sewerage installation of the present invention, the moulding technique of the unordered netted cylindrical shell of its modified polypropene, the unordered netted cylindrical shell of polyethylene or the unordered netted cylindrical shell of polyvinyl chloride is;
(1) sizing in the cylindrical shell: select the interior sizing tube of seamless steel pipe as the unordered netted cylindrical shell of plastics;
(2) the outer sizing of cylindrical shell: select greater than the seamless steel pipe of sizing in the cylindrical shell outer sizing tube as the unordered netted cylindrical shell of plastics;
(3) molding space of the unordered netted cylindrical shell of formation plastics between the interior sizing seamless steel pipe of cylindrical shell and the outer sizing seamless steel pipe, the one end is by the thread screw sizing on bikini and the outer sizing seamless steel pipe body, and the other end connects the extruder head sizing.
(4) in interior sizing seamless steel pipe, be set with to contract and move back and forth wind through rotation, this device be by have a constant pitch can undergauge the winding cover in the sizing seamless steel pipe, the undergauge mandrel, power transmission shaft constitutes, power transmission shaft is connected with the reducer main shaft, drive is contracted apart from mandrel, twines sizing tube rotation in the cover.
(5) adopt extruding-out process, with modified polypropene, polyethylene or polyvinyl chloride raw material, respectively by weight ratio, mix, add feed bin, under the hot melting temperature state, through the head of certain pore size orifice plate, extrude circular strip, be connected in the cylindrical shell then, on the body of the interior sizing tube between the seamless steel pipe of outer sizing, move back and forth the applying of wind intersection according to rotation and be wrapped on the body of interior sizing tube, again by the draw-gear traction, by the calibration sleeve sizing, the cooling system cooling and shaping constitutes the unordered netted cylindrical shell of plastics that unordered netted overlapping twines;
(6) with the demoulding of inside and outside sizing seamless steel sleeve and the cutting of the unordered netted cylindrical shell of intercellar layer plastics of above-mentioned steps (4) moulding, be shaped to void content and be 50%～70% the city rainwater osmotic sewerage installation of negative well, drainage channel or main duct cylindrical shell.
The present invention is according to city subsurface geologic structures and underground water source situation, on the basis of existing city underground drainage facility, set up infiltration facility and infiltration function, be stored in a large amount of rainwater in flood season underground, the flood control of not only having alleviated heavy rain heavy rain in the flood season problem of drainning off floodwaters, and improved the fight-flood disaster reduction ability in city effectively.
The technical solution used in the present invention and enforcement means are reality comparatively, below each manhole, set up negative well, and negative well, drainage channel and main duct cylindrical shell all adopt modified polypropene, polyethylene and igelite are made into unordered network architecture cylindrical shell, void content reaches 50%～70%, and be stored in the water of negative well and in the drainage procedure of drainage channel and main duct, under the effect of hydraulic pressure, water is penetrated in the stratum, underground water source after purifying through the geology natural filtration again, not only make underground water source obtain effective supply, and solved the water shortage problem in city.
The cylindrical shell of negative well of the present invention, drainage channel and main duct, anti-crowded anti-pressure ability is strong, and its compressive strength is: flat ratio was 50KP at 5% o'clock
a, flat ratio was 60KP at 10% o'clock
a, flat ratio was 80KP at 15% o'clock
a, flat ratio was 100KP at 20% o'clock
aReach application life more than 50 years, with low cost, effective, be a kind of existing city one of effective ways of retaining that drain off floodwaters flood season that solve, also be the effective city rainwater osmotic sewerage installation of a kind of flood fighting water conservation.
Description of drawings
Fig. 1 is the block construction schematic diagram of drainage of the present invention
Fig. 2 is the structural representation of the unordered netted cylindrical shell of plastics of negative well of the present invention
Fig. 3 is the structural representation of the unordered netted cylindrical shell of plastics of drainage channel of the present invention
Fig. 4 is the structural representation of the unordered netted cylindrical shell of plastics of main duct of the present invention
Fig. 5 is the structural representation that is used for city of the present invention underground drainage facility
Fig. 6 is the structural representation of the moulding form of the unordered netted cylindrical shell of plastics of the present invention
Fig. 7 is the left TV structure schematic diagram of the moulding form of the unordered netted cylindrical shell of plastics of the present invention
Among the figure: 1: car lane 2: stratum 3: gully 4: draining saliva castor 5: union 6: isolation flower pond 7: inspection shaft 8: filter well 9: arm 10: bicycle lane 11: discharge outlet dividing plate 12: draining saliva castor 13: pavement 14: gully dividing plate 15: water seepage hole 16: discharge outlet 17: drainage channel 18: main duct 19: outer sizing seamless steel pipe 20: interior sizing seamless steel pipe 21: undergauge mandrel 22: undergauge mechanism 23: rubber stopper
The specific embodiment
Provide the specific embodiment below in conjunction with accompanying drawing and can further describe the present invention in detail, present embodiment is to explanation of the present invention, does not limit the present invention and makes any restriction.
1. embodiment
(1) the present invention is on the basis of existing urban rainwater discharging facility, below each manhole, set up negative well, the cylindrical shell of its negative well adopts the unordered netted framework cylindrical shell of plastics, use original main duct instead plastics unordered netted framework main duct, constitute first kind of embodiment of city rainwater osmotic sewerage installation like this.
(2) among embodiment Fig. 1, comprise main duct 18, arm 9, connection pipe 5 and manhole 7, the catch pit 3 of motorway 1 is provided with the catch pit dividing plate 14 of the draining well water castor 4 and the connection mouth of pipe; Manhole 7 and following negative well 8 thereof be arranged on isolate flower pond 6 below; The outfall 16 of nonmotorized vehicle lane 10 is provided with draining saliva castor 12 and outfall dividing plate 11; The catch pit 3 of motorway 1 is connected with arm 9, drainage channel 17 and main duct 18 by negative well 8 or manhole 7 by connection pipe 5; The outfall 16 of nonmotorized vehicle lane 10 is connected by arm 9, comb passage 17 and main duct 18.Constitute second kind of embodiment of city rainwater osmotic sewerage installation like this.
(3) be used for embodiments of the invention Fig. 5, promptly in the facility of CN2761722Y patent, comprising main duct, arm, connection pipe and manhole, an end of connection pipe is communicated with catch pit, and the other end is communicated with arm or main duct by manhole; One end of arm is communicated with manhole, and the other end is connected with the main duct by manhole.Below water inlet, manhole etc., set up negative well, cylindrical shells such as negative well adopt the unordered netted framework cylindrical shell of plastics, original main duct used instead be the unordered netted framework main duct of plastics, constitute the third embodiment of city rainwater osmotic sewerage installation like this.
2. the cylindrical shell of negative well 8, drainage channel 17 and main duct 18 in above-mentioned three kinds of embodiments adopts modified polypropene, polyethylene or polyvinyl chloride raw material to be made into the unordered netted framework cylindrical shell of polypropylene plastics, the unordered netted framework cylindrical shell of vinyon or the unordered netted framework cylindrical shell of igelite, and its concrete raw material proportioning is by weight:
(1) modified polypropene
First kind of proportioning is: polypropylene PP:83, and high density polyethylene: 10, antioxidant 1010: 0.15, dilauryl thiodipropionate DLTP:0.1.
Second kind of proportioning is: polypropylene PP:95, and high density polyethylene: 13, antioxidant 1010: 0.2, dilauryl thiodipropionate DLTP:0.2.
The third proportioning is: polypropylene PP:116, and high density polyethylene: 15, antioxidant 1010: 0.35, dilauryl thiodipropionate DLTP:0.3.
(2) modified poly ethylene
First kind of proportioning is: low density polyethylene: 90, and dilauryl thiodipropionate DLTP:0.35, calcium carbonate CaCO
3: 40, antioxidant 1010: 0.35.
Second kind of proportioning is: low density polyethylene: 105, and dilauryl thiodipropionate DLTP:0.4, calcium carbonate CaCO
3: 45, antioxidant 1010: 0.4.
The third proportioning is: low density polyethylene: 115, and dilauryl thiodipropionate DLTP:0.55, calcium carbonate CaCO
3: 60, antioxidant 1010: 0.5.
(3) modified polyvinyl chloride
First kind of proportioning is: polyvinylchloride: 85, and dioctyl phthalate DOP:4.5, tribasic lead sulfate (three salt): 2.5, lead stearate PbSt:0.8, barium stearate BaSt:0.6, paraffin: 0.7.
Second kind of proportioning is: polyvinylchloride: 105, and dioctyl phthalate DOP:6, tribasic lead sulfate (three salt): 4.5, lead stearate PbSt:1.0, barium stearate BaSt:0.9, paraffin: 0.7.
The third proportioning is: polyvinylchloride: 120, and dioctyl phthalate DOP:7.5, tribasic lead sulfate (three salt): 5.5, lead stearate PbSt:1.3, barium stearate BaSt:1.2, paraffin: 0.8.
City rainwater osmotic sewerage installation of the present invention, the optimization proportioning of its concrete raw material is by weight:
Modified polypropene: low density polyethylene (LDPE) PP:100, high density polyethylene: 15, antioxidant 1010: 0.3, dilauryl thiodipropionate DLTP:0.2.
Modified poly ethylene: low density polyethylene: 100, dilauryl thiodipropionate DLTP:0.5, calcium carbonate CaCO
3: 50, antioxidant 1010: 0.5.
Modified polyvinyl chloride: polyvinylchloride: 100, dioctyl phthalate DOP:6, tribasic lead sulfate (three salt): 4, lead stearate PbSt:1, barium stearate BaSt:1, paraffin: 0.8.
3. city rainwater osmotic sewerage installation of the present invention, the making of the unordered netted cylindrical shell of its modified polypropene, the unordered netted cylindrical shell of polyethylene or the unordered netted cylindrical shell of polyvinyl chloride is by the plastic extruding forming main frame, subsidiary engine (head, calibrator, cooling unit, draw-gear and cutter sweep) is formed, its moulding technique carries out according to plastics extrusion and moulding process, and the specific embodiment is undertaken by following moulding technique:
(1), selects the sizing tube of the bright and clean seamless steel pipe of the one-tenth die face of existing format diameter for use as the unordered netted cylindrical shell of plastics in the inside and outside footpath of negative well 8, drainage channel 17 or main duct 18 according to the diameter of required negative well 8, drainage channel 17 or main duct 18;
(2) molding space of the unordered netted cylindrical shell of formation plastics between the interior sizing seamless steel pipe of the unordered netted cylindrical shell of plastics and the outer sizing seamless steel pipe, the one end is by the thread screw sizing on bikini and the outer sizing seamless steel pipe body, and the other end connects the head sizing.
(3) in interior sizing tube, be set with undergauge rotation and move back and forth wind, this device be by have pitch can the winding cover of undergauge in the sizing seamless steel pipe, the undergauge mandrel, power transmission shaft constitutes, power transmission shaft is connected with the reducer main shaft, drives to contract apart from mandrel, twines sizing seamless steel pipe rotation in the cover.
(4) the main and auxiliaries assembling is installed, adopt extruding-out process, on extruder, adopt the porous head, with modified polypropene, polyethylene or polyvinyl chloride raw material, respectively by above-mentioned weight portion proportioning, mix, add feed bin, under the hot melting temperature state, by the head of certain aperture orifice plate, extrude the viscous state circle strip of specified diameter, enter the molding space of the unordered netted pipe of intercellar layer plastics then, be connected to be equipped with and contract on rotating the body that moves back and forth sizing seamless steel pipe in the wind, the strip fused raw material of extruding by head enter diameter-setting equipment in, between the body of outer seamless steel pipe, Yi Bian slowly rotate, Yi Bian pulsed moves back and forth, the carefully round bar of the strip viscous state of extruding, move back and forth the applying of wind intersection according to rotation and be wrapped on the body of interior sizing seamless steel pipe, again by the draw-gear traction, by the calibration sleeve sizing, the cooling system cooling and shaping constitutes the unordered netted framework of plastics that unordered netted overlapping twines;
(5) with the inside and outside calibration sleeve demoulding of the unordered netted pipe of intercellar layer plastics of moulding, cutting, be shaped to void content and be 50%～70% the city rainwater osmotic sewerage installation of negative well, a tube passage and main duct cylindrical shell.
Claims (7)
1. city rainwater osmotic sewerage installation, it contains main duct, arm, connection pipe and manhole, and an end of connection pipe is communicated with catch pit, and the other end is communicated with arm or main duct by manhole; One end of arm is communicated with manhole, the other end is connected with the main duct by manhole, it is characterized in that motorway catch pit (3) is connected with arm (9), drainage channel (17) and main duct (18) by negative well (8) or manhole (7) by connection pipe (5); Described negative well (8) be arranged on manhole (7) below, its cylindrical shell is to be made of the unordered mesh skeleton of plastics; The cylindrical shell of described drainage channel (17) and main duct (18) is to be made of the unordered mesh skeleton of plastics.
2. city rainwater osmotic sewerage installation as claimed in claim 1, the cylindrical shell that it is characterized in that negative well (8), drainage channel (17) and main duct (18) are to be made of modified polypropene, modified poly ethylene or the unordered mesh skeleton of modified polyvinyl chloride alkene plastics.
3. city rainwater osmotic sewerage installation as claimed in claim 2, the raw material proportioning that it is characterized in that the unordered netted cylindrical shell of modified polypropene is by weight: low density polyethylene (LDPE) PP:80～120, high density polyethylene: 10～20, antioxidant 1010: 0.15～0.5, dilauryl thiodipropionate DLTP:0.1～0.3.
4. city rainwater osmotic sewerage installation as claimed in claim 2 is characterized in that the raw material proportioning of the unordered netted cylindrical shell of modified poly ethylene is by weight: low density polyethylene: 88～116, and dilauryl thiodipropionate DLTP:0.3～0.7, CaCO
3: 38～62, antioxidant 1010: 0.3～0.65.
5. city rainwater osmotic sewerage installation as claimed in claim 2, the raw material proportioning that it is characterized in that the unordered netted cylindrical shell of modified polyvinyl chloride is by weight: polyvinylchloride: 83～126, dioctyl phthalate DOP:4～8, tribasic lead sulfate: 2～6, lead stearate PbSt:0.8～1.5, barium stearate BaSt:0.6～1.2, paraffin: 0.6～0.8.
6. as claim 3,4 or 5 described city rainwater osmotic sewerage installations, it is characterized in that the moulding technique of the unordered netted cylindrical shell of modified polypropene, the unordered netted cylindrical shell of modified poly ethylene or the unordered netted cylindrical shell of modified polyvinyl chloride is:
(1) sizing in the cylindrical shell: select the interior sizing tube of seamless steel pipe as the unordered netted cylindrical shell of plastics;
(2) the outer sizing of cylindrical shell: select greater than the seamless steel pipe of sizing in the cylindrical shell outer sizing tube as the unordered netted cylindrical shell of plastics;
(3) molding space of the unordered netted cylindrical shell of formation plastics between the interior sizing seamless steel pipe of cylindrical shell and the outer sizing seamless steel pipe, the one end is by the thread screw sizing on bikini and the outer sizing seamless steel pipe body, and the other end connects the extruder head sizing.
(4) in interior sizing seamless steel pipe, be set with the undergauge rotation and move back and forth wind, this device be by have a constant pitch can undergauge the winding cover in the sizing seamless steel pipe, the undergauge mandrel, power transmission shaft constitutes, power transmission shaft is connected with the reducer main shaft, drives to contract apart from mandrel, the interior sizing tube rotation of winding cover.
(5) adopt extruding-out process, with modified polypropene, modified poly ethylene or modified polyvinyl chloride raw material, respectively by weight ratio, mix, add feed bin, under the hot melting temperature state, extruder head through the certain pore size orifice plate, extrude circular strip, connect then in cylindrical shell, on the body of the interior sizing tube between the seamless steel pipe of outer sizing,, rotation is wrapped on the body of interior sizing tube along with moving back and forth the applying of wind intersection, draw by draw-gear again, by the calibration sleeve sizing, the cooling system cooling and shaping constitutes the unordered netted cylindrical shell of plastics that unordered netted overlapping twines;
(6), be shaped to the cylindrical shell of negative well (8), drainage channel (17) or the main duct (18) of city rainwater osmotic sewerage installation with the demoulding of inside and outside seamless steel pipe calibration sleeve, the cutting of the unordered netted cylindrical shell of intercellar layer plastics of above-mentioned steps (4) moulding
7. city rainwater osmotic sewerage installation as claimed in claim 6 is characterized in that the void content of the cylindrical shell of negative well (8), drainage channel (17) and main duct (18) is 50%～70%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100483820A CN100458031C (en) | 2006-09-29 | 2006-09-29 | City rainwater osmotic sewerage installation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100483820A CN100458031C (en) | 2006-09-29 | 2006-09-29 | City rainwater osmotic sewerage installation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1932176A CN1932176A (en) | 2007-03-21 |
| CN100458031C true CN100458031C (en) | 2009-02-04 |
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ID=37878190
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100483820A Expired - Fee Related CN100458031C (en) | 2006-09-29 | 2006-09-29 | City rainwater osmotic sewerage installation |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103015460A (en) * | 2011-12-16 | 2013-04-03 | 山东科技大学 | Method for preventing water storage in strong or weak current well |
| CN102635157B (en) * | 2012-03-22 | 2015-02-25 | 杭州洞庭科技有限公司 | Siphoning type rainwater drainage and recovery system |
| CN103452183A (en) * | 2013-02-01 | 2013-12-18 | 河南省佰腾电子科技有限公司 | Method for preventing garbage from entering sewer from sewer manhole cover |
| CN103319770A (en) * | 2013-06-20 | 2013-09-25 | 吴江市董鑫塑料包装厂 | Valve plastic |
| CN103319771A (en) * | 2013-06-20 | 2013-09-25 | 吴江市董鑫塑料包装厂 | Plastic for hard tube |
| CN103613851B (en) * | 2013-10-22 | 2016-03-02 | 安徽省忠宏管业科技有限公司 | A kind of PPR pipe of high anti-ageing and manufacture method thereof |
| CN110522563A (en) * | 2018-05-23 | 2019-12-03 | 文宜平 | Baby's dung urine pants |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2042489U (en) * | 1988-06-02 | 1989-08-09 | 赵石珠 | Closed rain-water draining outlet |
| JPH08144355A (en) * | 1994-11-22 | 1996-06-04 | Mitsuhiro Fujiwara | Outflow restrainer for rainfall |
| DE19500171A1 (en) * | 1995-01-05 | 1996-07-11 | Hilco Tunnelvortriebstechnik G | Drainage system with rain water ground disposal |
| CN2761722Y (en) * | 2004-09-29 | 2006-03-01 | 郭润楼 | Penetration type city rainwater drainage installation |
-
2006
- 2006-09-29 CN CNB2006100483820A patent/CN100458031C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2042489U (en) * | 1988-06-02 | 1989-08-09 | 赵石珠 | Closed rain-water draining outlet |
| JPH08144355A (en) * | 1994-11-22 | 1996-06-04 | Mitsuhiro Fujiwara | Outflow restrainer for rainfall |
| DE19500171A1 (en) * | 1995-01-05 | 1996-07-11 | Hilco Tunnelvortriebstechnik G | Drainage system with rain water ground disposal |
| CN2761722Y (en) * | 2004-09-29 | 2006-03-01 | 郭润楼 | Penetration type city rainwater drainage installation |
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| CN1932176A (en) | 2007-03-21 |
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Granted publication date: 20090204 Termination date: 20110929 |