CN104818765B - Negative-pressure type intelligent discharge improvement method for rainwater well cover - Google Patents
Negative-pressure type intelligent discharge improvement method for rainwater well cover Download PDFInfo
- Publication number
- CN104818765B CN104818765B CN201510125452.7A CN201510125452A CN104818765B CN 104818765 B CN104818765 B CN 104818765B CN 201510125452 A CN201510125452 A CN 201510125452A CN 104818765 B CN104818765 B CN 104818765B
- Authority
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- China
- Prior art keywords
- ponding
- catch basin
- rainwater
- basin cover
- water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000000034 method Methods 0.000 title claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 101
- 238000006073 displacement reaction Methods 0.000 claims description 10
- 238000007689 inspection Methods 0.000 claims description 10
- 238000005086 pumping Methods 0.000 claims description 3
- 238000009423 ventilation Methods 0.000 abstract description 9
- 238000012423 maintenance Methods 0.000 abstract description 5
- 230000001953 sensory effect Effects 0.000 description 18
- 230000007423 decrease Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000005273 aeration Methods 0.000 description 4
- 206010039203 Road traffic accident Diseases 0.000 description 3
- 239000002352 surface water Substances 0.000 description 3
- 230000001131 transforming effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000008447 perception Effects 0.000 description 2
- 238000013022 venting Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/04—Gullies inlets, road sinks, floor drains with or without odour seals or sediment traps
- E03F5/06—Gully gratings
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/04—Gullies inlets, road sinks, floor drains with or without odour seals or sediment traps
- E03F5/06—Gully gratings
- E03F2005/068—Gully gratings with means for enhancing water flow
Abstract
The invention discloses a negative-pressure type intelligent discharge improvement method for a rainwater well cover, and belongs to the technical field of urban road surface drainage. A ventilation system which can be automatically controlled according to the condition of accumulated water at the place of the rainwater well cover is employed. When rainwater on a road surface enables the rainwater well cover to be submerged and flows into the rainwater well cover, free-type inflowing is achieved through a self-control device, and the discharge of the rainwater on the road surface is improved automatically, or when rainwater on the road surface enables the rainwater well cover to be submerged and flows into the rainwater well cover, absorption-type negative pressure is formed automatically, and the discharge of the rainwater on the road surface is improved. The method is good in instantaneity, initiative, automation and intelligentization, and there is no need of watching. Moreover, method is wide in application range, and enables the maintenance to be convenient.
Description
The application is the divisional application of " at catch basin cover ponding intelligently increase discharge method ", and the application number of original bill application is
201410113207X, the applying date is 2014-03-25, invention and created name " ponding intelligently increases discharge method at catch basin cover ".
Technical field
The present invention relates to ponding intelligently increases discharge method at a kind of catch basin cover, specifically there are two kinds of forms：One is according to rainwater
Ponding at well lid, by rainfall sensory perceptual system, automatically controls aerating system, automatic shape when ponding is in floodage at the catch basin cover
Increase row's rainwater into free style influent stream；Two is by drainage well structure system optimization, when ponding is in floodage at the catch basin cover
Automatically form negative pressure suction rainwater and increase row；Belong to the technical field of Pavement Drainage of Cities.
Background technology
Current Pavement Drainage of Cities, mostly by the inlet opening of catch-basin cover plate as shown in Figure 1, 2, 3 by road surface
Rainwater enters urban drainage pipe network.Using the catch basin cover of this structure, often there is impeded drainage, sometimes in, small intensity rainfall
It is accomplished by cover plate is opened manually, so increases the problems such as also causing traffic accident while row's rainwater increases workman's workload, dimension
The inconvenience such as protect, keep an eye on.For this purpose, also using many methods to increase row's ponding in engineering：First, increase the aperture of inlet opening, lead to
Cross and expand into flow area to increase displacement.This can bring pavement garbage to enter and traffic safety problem；Second, increase in rainwater
Distribution density on well lid inlet opening, increases displacement.Effect on driving birds is not good in the case that the well lid gross area is certain, while cover body structure
Intensity can decline；3rd, by the thickness for reducing rainwater cover plate, the contact area of ponding stream and catch basin cover is reduced, shortens product
The time of staying of the current on catch basin cover, and then increase displacement.Cover body structure intensity can decline, and cause road surface to ask safely
Topic.In a word using the catch basin cover of said structure, it is unsatisfactory that surface gathered water increases row's effect.Accordingly, it would be desirable to a kind of new ponding
Increase discharge method.
The content of the invention
It is an object of the invention to provide ponding intelligently increases discharge method at a kind of catch basin cover, specifically there are two kinds of forms：One
It is, according to ponding at catch basin cover, by rainfall sensory perceptual system, to automatically control aerating system, ponding is in floodage at the catch basin cover
When automatically form free style influent stream increase row rainwater；Two is that, by drainage well structure system optimization, ponding is in flooding at the catch basin cover
Negative pressure suction rainwater is automatically formed when not having state and increases row；With real-time, initiative, automation, intellectuality, need not keep an eye on, with
And use range is wide, the advantages of easy to maintenance.
The purpose of the present invention realizes that by two categories below technical scheme ponding intelligently increases discharge method at catch basin cover,
Surface gathered water is discharged including the inlet opening by arranging on the catch basin cover on inspection shaft, discharge method is increased using intelligent aeration type, when
At catch basin cover on inspection shaft ponding compared with deep into flood influent stream when, by ponding water yield sensory perceptual system module start catch basin cover under
Machine driven system module, further start aerating system module, by the breather pipe in aerating system module by inspection shaft
Chamber and atmosphere, form draining free style influent stream faster at catch basin cover, increase catch basin cover water inlet flow, quickly
Venting surface gathered water.
Further, the intelligent aeration type increases discharge method and includes：Perception is compared by ponding water yield sensory perceptual system module
The magnitude relationship of inflow and water yield, influent stream form at automatic discrimination catch basin cover, when catch basin cover is flooded by ponding in device
When ning, catch basin cover inlet opening water inlet is submerged influent stream, is intake in ponding water yield sensory perceptual system module perception sensing device
Aerating system module is started by machine driven system module by amount more than water yield, ponding water yield sensory perceptual system module, rainwater
Open to atmosphere free style influent stream is formed at well lid, increases water inlet flow；When surface gathered water is reduced, the water inlet of catch basin cover inlet opening
When mouth is in free style influent stream, during ponding water yield sensory perceptual system module perceives sensing device, inflow is less than water yield, the ponding water yield
Aerating system module is closed by sensory perceptual system module by machine driven system module.
Further, water yield sensing device is provided with the ponding water yield sensory perceptual system module, the device is by turnover, water
Amount balance is operated.
Further, pulley, pulley fixed frame are provided with the machine driven system module, pulley passes through pulley fixed frame
The catch basin cover back side is arranged on, pulley is provided with the advance decline line of connection ponding water yield sensing device and the breather pipe.
Further, it is provided with the machine driven system module including lever, lever fixed support, lever fixing axle,
Lever fixed support is arranged on the catch basin cover back side, and lever is arranged on lever fixed support by lever fixing axle, lever two ends
The ponding water yield sensing device and the breather pipe are set.
Further, breather pipe bascule is provided with the aerating system module, breather pipe bascule is arranged on institute
State below breather pipe, the inlet opening of the corresponding catch basin cover in the breather pipe upper end.
The present invention also has another kind of technical scheme realized, at catch basin cover, ponding intelligently increases discharge method, including by basement
Surface gathered water is discharged in the inlet opening that catch basin cover on well is arranged, and increases discharge method using intelligent negative pressure, when the catch-basin on inspection shaft
At lid ponding compared with deep into flood influent stream when, by catch basin cover suction type border generate system module, catch basin cover intake
Negative pressuren zone is formed at mouthful, and then forms vertical water outflowing jet, as ponding forms necked-down section in inlet opening, entering at necked-down section
Water hole edge forms negative pressuren zone, and ponding on the vacuum auto-pumping catch basin cover that negative pressuren zone is produced increases inlet opening displacement；It is logical
Crossing, water inlet edge right angle in inlet opening is increased the vacuum of negative pressuren zone, further increases road surface drainage amount.
Compared with prior art, the invention has the advantages that：
First, increase the aerating system device automatically turned on according to rainwater on road surface amount, this dress on existing drainage manhole cover
Put and can ensure that draining enters stream mode in free style all the time at catch-basin grid lid；Increasing can be according to the situation of rainwater on road surface amount certainly
The dynamic increasing arranging device for increasing draining opened, close, during in surface gathered water so that influent stream is in floodage at grid lid, increases arranging device
Automatic, aerating system form free style influent stream, increase displacement；When surface gathered water is reduced, and import is in free style influent stream,
Increase vent system on arranging device to be automatically switched off；The present invention can reach the cover plate water inlet of guarantee catch-basin using pulley, lever principle
Mouth is in free style influent stream automatically；The present invention can according to surface gathered water amount and its at the catch-basin cover plate influent stream situation, automatic shape
Into water inlet free style influent stream, this device can be automatically opened up according to the road surface water yield, be closed；
Second, existing drainage manhole cover water inlet edge is optimized and can be improved into flow, accelerate drainage speed, increased
Displacement, is a kind of method of the Pavement surface drainage for keeping optimal draining efficiency；
3rd, the invention enables Pluvial catch-basin draining is easy to maintenance；Stretch out air-breather and adopt plastic material, have
While ventilation forms free style influent stream function, rainy day water inlet mark is also used as, plastic material ventilation is desirably prevented
Traffic accident；Corollary apparatus are simple, can use on existing catch-basin, without the need for transforming to catch-basin, greatly facilitate and send out
Bright application and popularizations.
4th, catch-basin cover plate new structure of the present invention using hydraulics vertical water outflowing jet principle design can be according to road surface
Water accumulating volume and its at the catch-basin cover plate influent stream situation, automatically form water inlet ozzle influent stream, increase road surface drainage.
5th, the invention enables Pluvial catch-basin draining is easy to maintenance；Corollary apparatus are simple, can be on existing catch-basin
Use, without the need for transforming to catch-basin, greatly facilitate the application and popularizations of invention.
Description of the drawings
Fig. 1 is the structural representation of existing catch basin cover；
Fig. 2 is the cross section structure diagram in A-A directions in Fig. 1；
Fig. 3 is the cross section structure diagram in B-B directions in Fig. 1；
Fig. 4 is the schematic flow sheet that ponding intelligently increases discharge method at catch basin cover of the present invention；
Fig. 5 is the structural representation of the increasing arranging device of embodiment middle pulley balanced type；
Fig. 6 is the sectional view in A-A directions in Fig. 5；
Fig. 7 is the structural representation of lever balance-type increasing arranging device in embodiment；
Fig. 8 is the cross section structure diagram in A-A directions in Fig. 7；
Fig. 9 is the structural representation of suction type catch basin cover in embodiment；
Figure 10 is the cross section structure diagram in A-A directions in Fig. 9；
Figure 11 is the cross section structure diagram in B-B directions in Fig. 9；
In figure：1 catch basin cover；2 water inlets；3 pulleys；4 advance decline lines；5 breather pipes；6 rainfall perceive cup；7 apopores；8 slide
Wheel fixed mount；9 breather pipe balance weights；10 breather pipe fixing holders；11 breather pipe fixing axles；12 breather pipe fixed supports；13 lead to
Tracheae counterweight messenger wire；14 breather pipe counterweights；15 levers；16 lever fixing axles；17 lever fixed supports；18 rainfall are perceived
Bucket；Ponding on 19 catch-basin cover plates；The rainwater let out under 20 water inlets；21 negative pressuren zones；22 water inlet negative pressure produce frame.
Specific embodiment
At catch basin cover, ponding intelligently increases discharge method, has two categories below technical method.
As shown in figure 4, ponding intelligently increases discharge method at catch basin cover, including by arranging on the catch basin cover on inspection shaft
Surface gathered water is discharged in inlet opening, increases discharge method using intelligent aeration type, at the catch basin cover on inspection shaft ponding compared with deep into flooding
When not having influent stream, the machine driven system module under catch basin cover is started by ponding water yield sensory perceptual system module, further started logical
Gas system module, by the breather pipe in aerating system module by inspection shaft inner chamber and atmosphere, the row of being formed at the catch basin cover
Water free style influent stream faster, increases catch basin cover water inlet flow, quick venting surface gathered water.Ponding water yield sensory perceptual system mould
Block connects aerating system module by machine driven system module.
Intelligent aeration type increases discharge method to be included：By ponding water yield sensory perceptual system module compare in sensing device inflow with
The magnitude relationship of water yield, influent stream form at automatic discrimination catch basin cover, when catch basin cover is flooded by ponding, catch basin cover enters
Water hole water inlet is submerged influent stream, and during ponding water yield sensory perceptual system module perceives sensing device, inflow is more than water yield, product
Aerating system module is started by water water yield sensory perceptual system module by machine driven system module, and logical air is formed at catch basin cover
Free style influent stream, increase water inlet flow；When surface gathered water is reduced, catch basin cover inlet opening water inlet is in free style influent stream
When, during ponding water yield sensory perceptual system module perceives sensing device, inflow is less than water yield, and ponding water yield sensory perceptual system module is led to
Cross machine driven system module to close aerating system module.
As shown in Figure 5,6, in ponding water yield sensory perceptual system module, sensing device is that rainfall perceives cup 6, and rainfall perceives cup bottom
Portion is provided with apopore 7.In machine driven system module, device includes pulley 3, advance decline line 4, pulley fixed frame 8.Aerating system mould
In block, device includes breather pipe 5 and breather pipe balance weight 9.Pulley is arranged on catch basin cover water inlet bottom by pulley fixed frame
Portion, pulley are provided with advance decline line.Advance decline line one end arranges rainfall and perceives cup, and the advance decline line other end arranges breather pipe.Under breather pipe
End is arranged on advance decline line by geometrical clamp, and advance decline line bottom arranges breather pipe balance weight, the breather pipe upper end correspondence rainwater
The water inlet of well lid.Rainfall perceives cup in free style influent stream, and in cup, inflow is equal to water yield, and breather pipe is located at catch basin cover
Lower section.Rainfall perceives cup in submerged influent stream, and in cup, inflow is more than water yield, and rainfall is perceived cup and declined, connected by pulley
The breather pipe for connecing is stretched out outside the ponding above water inlet, it is ensured that influent stream is the free style influent stream of ventilation, increases water inlet flow.
As shown in Figure 7,8, in ponding water yield sensory perceptual system module, sensing device is that rainfall perceives bucket 18, and rainfall perceives bucket 18
Bottom is provided with apopore 7.In machine driven system module, device includes lever 15, lever fixed support 17, lever fixing axle 16.
In aerating system module, device includes breather pipe 5, breather pipe counterweight 14.Lever passes through lever fixed support, lever fixing axle
Catch basin cover water inlet bottom is arranged on, lever one end arranges the rainfall and perceives bucket, and the lever other end arranges breather pipe.Ventilation
Breather pipe counterweight, breather pipe upper end correspondence water inlet are connected by messenger wire 13 below pipe.In free style influent stream, rainfall is perceived
In bucket, inflow is equal to water yield, and breather pipe is located at below catch basin cover.In submerged influent stream, rainfall perceives inflow in bucket
More than water yield, rainfall perceives bucket and declines, and the breather pipe connected by lever is stretched out outside the ponding above water inlet, it is ensured that influent stream
For the free style influent stream of ventilation, increase water inlet flow.
Water inlet edge is circular arc.It is radiused to existing drainage manhole cover water inlet edge, increase flow-in coefficient, improve into
Flow, accelerates drainage speed, increases displacement, is a kind of method of the Pavement surface drainage for keeping optimal draining efficiency.
Breather pipe can be plastic tube, and ventilation pipe outer wall scribbles traffic warning mark.Air-breather is stretched out using plasticity material
Material, while forming free style influent stream function with ventilation, is also used as rainy day water inlet mark, and plastic material ventilation is favourable
In trying to forestall traffic accidents.
Increase the aerating system device automatically turned on according to rainwater on road surface amount on existing drainage manhole cover, this device can be protected
Draining at card catch-basin grid lid enters stream mode in free style all the time；Increase can be beaten automatically according to the situation of rainwater on road surface amount
The increasing arranging device of the increase draining that open and close are closed, during in surface gathered water so that influent stream is in floodage at grid lid, increases arranging device automatic
Start, aerating system forms free style influent stream, increase displacement；
When surface gathered water is reduced, and import is in free style influent stream, increase vent system on arranging device and be automatically switched off；The present invention
Guarantee catch-basin cover plate water inlet is reached using pulley, lever principle be in automatically free style influent stream；
The present invention can according to surface gathered water amount and its at the catch-basin cover plate influent stream situation, automatically form water inlet freedom
Formula influent stream, the device in the inventive method can be automatically opened up according to the road surface water yield, be closed.
As shown in Fig. 4,9,10,11, at catch basin cover, ponding intelligently increases discharge method, can also be by following Equations of The Second Kind technology
Method is realized：I.e. at catch basin cover, ponding intelligent negative pressure increases discharge method, at the catch basin cover that the method includes on inspection shaft ponding compared with
Deep into flood influent stream when, by catch basin cover new structure suction type border generate system module, in catch basin cover water inlet
Place forms negative pressure（Vacuum）Area, and then vertical water outflowing jet is formed, as ponding forms necked-down section in inlet opening, at necked-down section
Water inlet bore edges formed negative pressuren zone, negative pressuren zone produce vacuum auto-pumping catch basin cover on ponding, increase inlet opening draining
Amount；By by inlet opening water inlet edge right angle, increasing the vacuum of negative pressuren zone, further increase road surface drainage amount.
Catch-basin cover plate new structure of the present invention using hydraulics vertical water outflowing jet principle design, can be according to surface gathered water amount
And its at the catch-basin cover plate influent stream situation, automatically form water inlet ozzle influent stream, increase road surface drainage.On catch-basin cover plate
Ponding 19 is formed when flooding stream, due to the nozzle arrangement that the well lid depth for adopting inlet opening is 3-4 times of water inlet width, is intake
Mouth is formed, and the water inlet edge at necked-down section forms negative pressure（Vacuum）Area 21,
I.e. water inlet edge is that water inlet negative pressure produces frame 22, and the vacuum that negative pressuren zone is produced is automatically increased the rainwater 20 let out under water inlet
Displacement, water inlet edge right angle increase the vacuum of negative pressuren zone, so as to increase road surface drainage amount；When surface gathered water is reduced,
When water inlet is in free style influent stream, negative pressuren zone disappears, and forms aperture influent stream.
The invention enables Pluvial catch-basin draining is easy to maintenance；Corollary apparatus are simple, can use on existing catch-basin,
Without the need for transforming to catch-basin, the application and popularizations of invention are greatly facilitated.
Claims (1)
1. at catch basin cover, ponding suction type intelligently increases discharge method, including the inlet opening row arranged by the catch basin cover on inspection shaft
Except surface gathered water, it is characterized in that, intelligently increase discharge method using suction type, the well lid depth at the inlet opening is water inlet width
3-4 times, water inlet edge right angle, when the rainwater on inspection shaft at well lid ponding compared with deep into flood influent stream when, catch basin cover
Water inlet automatically forms negative pressuren zone, and then forms vertical water outflowing jet, as ponding forms necked-down section in inlet opening, shrinks disconnected
Water inlet bore edges at face form negative pressuren zone, and ponding on the vacuum auto-pumping catch basin cover that negative pressuren zone is produced increases inlet opening
Displacement；By by the water inlet edge right angle of inlet opening, increasing the vacuum of negative pressuren zone, further increasing road surface drainage
Amount.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510125452.7A CN104818765B (en) | 2014-03-25 | 2014-03-25 | Negative-pressure type intelligent discharge improvement method for rainwater well cover |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410113207.XA CN103882937B (en) | 2014-03-25 | 2014-03-25 | Method for intelligently facilitating discharging of accumulated water on rain water well lid |
| CN201510125452.7A CN104818765B (en) | 2014-03-25 | 2014-03-25 | Negative-pressure type intelligent discharge improvement method for rainwater well cover |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410113207.XA Division CN103882937B (en) | 2014-03-25 | 2014-03-25 | Method for intelligently facilitating discharging of accumulated water on rain water well lid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104818765A CN104818765A (en) | 2015-08-05 |
| CN104818765B true CN104818765B (en) | 2017-03-22 |
Family
ID=50952037
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510125452.7A Expired - Fee Related CN104818765B (en) | 2014-03-25 | 2014-03-25 | Negative-pressure type intelligent discharge improvement method for rainwater well cover |
| CN201410113207.XA Active CN103882937B (en) | 2014-03-25 | 2014-03-25 | Method for intelligently facilitating discharging of accumulated water on rain water well lid |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410113207.XA Active CN103882937B (en) | 2014-03-25 | 2014-03-25 | Method for intelligently facilitating discharging of accumulated water on rain water well lid |
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| Country | Link |
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| CN (2) | CN104818765B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105735423B (en) * | 2016-02-26 | 2018-04-13 | 江苏博阳智慧电气股份有限公司 | A kind of fire water-supply drainage system |
| CN105625547B (en) * | 2016-02-26 | 2017-10-10 | 江苏博阳智慧电气股份有限公司 | A kind of sewerage system |
| CN105839490A (en) * | 2016-03-24 | 2016-08-10 | 孙啸 | Road drainage system based on Internet of things |
| CN109137991B (en) * | 2018-08-11 | 2020-10-09 | 湖南城市学院 | Intelligent inspection well cover |
| CN110485537B (en) * | 2019-09-28 | 2020-03-31 | 磐安秀吉新能源科技有限公司 | Pneumatic-based anti-blocking drainage well cover |
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| CN2093869U (en) * | 1991-06-12 | 1992-01-22 | 唐皓 | Float-type sewer odour device |
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| KR100982338B1 (en) * | 2009-04-29 | 2010-09-15 | 배석동 | System for bad smell removal of sewerage |
| KR20120012903A (en) * | 2010-08-03 | 2012-02-13 | 주식회사 동호 | Sewerage structure having ventilator with a function of deodorization |
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- 2014-03-25 CN CN201510125452.7A patent/CN104818765B/en not_active Expired - Fee Related
- 2014-03-25 CN CN201410113207.XA patent/CN103882937B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1138126A (en) * | 1995-06-15 | 1996-12-18 | 何纯提 | Nozzle mud pipe |
| CN2653021Y (en) * | 2003-10-21 | 2004-11-03 | 陈涛 | Automatic closing type rain drainage well grid for road |
| CN1598520A (en) * | 2004-07-02 | 2005-03-23 | 浙江大学 | Porthole mouthpiece tester with movable contact |
| CN2783299Y (en) * | 2004-07-02 | 2006-05-24 | 浙江大学 | Hole mouth test device with moveable contact |
| CN202658711U (en) * | 2011-03-22 | 2013-01-09 | 王海芳 | Permeable filler cover plate for ditch |
| KR101172026B1 (en) * | 2012-01-12 | 2012-08-07 | 주식회사 삼안 | Drainage device for shoulder of road |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103882937B (en) | 2015-04-22 |
| CN103882937A (en) | 2014-06-25 |
| CN104818765A (en) | 2015-08-05 |
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