CN206721984U - A kind of water-fetching head for preventing siphon pipe from evacuating - Google Patents
A kind of water-fetching head for preventing siphon pipe from evacuating Download PDFInfo
- Publication number
- CN206721984U CN206721984U CN201720523795.3U CN201720523795U CN206721984U CN 206721984 U CN206721984 U CN 206721984U CN 201720523795 U CN201720523795 U CN 201720523795U CN 206721984 U CN206721984 U CN 206721984U
- Authority
- CN
- China
- Prior art keywords
- cavity
- water
- pipe
- fixed
- shrouding
- 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
Landscapes
- Jet Pumps And Other Pumps (AREA)
Abstract
It the utility model is related to a kind of water-fetching head for preventing siphon pipe from evacuating.It is hollow that the invention, which includes cavity, water wing, bend pipe, destruction vacuum mechanism and enclosed mechanism composition, cavity, and cavity lower periphery surrounding is fixed with water wing, has drawstring in the upper end system of cavity;Bend pipe is provided with check-valves and the blast pipe with air bleeding valve;Destroy vacuum mechanism has the upper floating ball of transmission rope one end, the middle support for being provided with positioning hole including latch, lower part series;Enclosed mechanism includes shrouding, drive link, lower ball float, rotating shaft and locating rod.The utility model can be when liquid level drops to predeterminated position, automatically seal at the suction inlet of siphon pipe, prevent siphon pipe from continuing to aspirate, cause to evacuate, it is not required to form the condition of induction generation siphon using will pour water in siphon pipe again next time, the invention is simple to operate, it is not necessary to which the moment keeps a close watch on the change of liquid level.
Description
Technical field
The present invention relates to a kind of siphon pipe, more particularly to one kind can prevent from being used for pumping slurries mummifying pool supernatant siphon
The water-fetching head that pipe evacuates.
Background technology
At present, the processing mode that most domestic discarded slurry uses is still natural sedimentation drying technique.In city work
Journey, construction site is small, and general mud outward transport focuses on to neighbouring natural sedimentation mummifying pool;Construction work in the wild, from concentration
Processing mummifying pool has available or lease vacant lot farther out, the natural mummifying pool of the self-built discarded slurry of construction party;This desiccation
Pond is formed using soil embankment on building site, and linkage is fairly simple.Because mud natural-dehydration is slower, large area is so needed
Mummifying pool, increase rent, and desiccation speed influenceed by weather it is bigger.Accelerate the desiccation speed of mud, it is possible to reduce desiccation
The area in pond and rental period.Because piling construction is discontinuity, therefore discarded slurry is also the entrance mummifying pool of discontinuity;
After part discarded slurry enters mummifying pool, a period of time is stood, certain supernatant can be produced, now, rapidly by supernatant
Mummifying pool is completely exhausted out, is advantageous to mud upper strata internal moisture and is discharged by Influence of Evaporation, it is possible to increase the desiccation speed of mud.
At present, by the way of groove discharge supernatant is excavated on dykes and dams, if mud liquid level is low, groove needs to dig deep, such as
At pond center, supernatant is difficult that discharge is clean, and the mud in dykes and dams is easily washed away during discharge, is made in supernatant bosom in fruit pond
Draining is muddy., it is necessary to which the moment is observed when aspirating supernatant using siphon pipe, otherwise it is easy to that the phenomenon that siphon pipe evacuates occurs,
Guan Shui is caused to be evacuated, next use will will pour water in siphon pipe again, form the condition that induction produces siphon, troublesome in poeration.
The content of the invention
For above-mentioned prior art, the technical problem to be solved in the present invention is to provide a kind of water intaking for preventing siphon pipe from evacuating
Head.
In order to solve the above technical problems, the present invention it is a kind of prevent siphon pipe evacuate water-fetching head, including cavity, water wing,
Bend pipe, destroy vacuum mechanism and enclosed mechanism composition.Cavity is hollow, and cavity lower periphery surrounding is fixed with water wing, in cavity
Upper end system have drawstring.Bend pipe is made up of upper horizontal tube, lower horizontal tube, VERTICAL TUBE, upper elbow and lower elbow, and horizontal positioned is upper
Horizontal tube passes through cavity top, and the one end of upper horizontal tube outside cavity can pass through pipe collar connection flexible pipe water inlet end, upper horizontal tube
One end of elbow in other end connection in cavity, the other end of upper elbow connect the one of lower elbow by vertical VERTICAL TUBE
End, the other end of lower elbow are connected to one end of horizontal positioned lower horizontal tube, and the other end of lower horizontal tube is water inlet, perpendicular
The check-valves for only allowing the current flowed up to pass through is provided with straight tube, upper elbow is provided with air bleeding valve vertically upward
Blast pipe.
Above-mentioned lower horizontal tube top outer tube wall is sticked in raised platforms bottom, and raised platforms upper surface is plane, and projection is flat
Platform and lower horizontal tube outer tube wall by same perforation through.
Above-mentioned destruction vacuum mechanism includes latch, lower part series have the upper floating ball of transmission rope one end, centre to be provided with positioning hole
Support, latch is made up of inserted link and pole cap, and pole cap lower end sets cushion film, and the diameter of pole cap and cushion film is more than the straight of perforation
Footpath, elastic threads one end is fixed with pole cap, the elastic threads other end is fixed in lower horizontal pipe outer wall, and the transmission rope other end is through fixed
Position hole is fixed at the top of pole cap, and positioning hole is in the surface of pole cap, and support is fixed on cavity inner wall, and inserted link diameter, which is less than, to be worn
Bore dia, inserted link is through perforation, and when elastic threads are in maximum tension state, inserted link is still in perforation.
Above-mentioned enclosed mechanism includes shrouding, drive link, lower ball float, rotating shaft and locating rod, and one layer of cushion is posted on shrouding surface
The diameter of layer, shrouding and cushion course is more than the diameter of water inlet, and hollow annulus is set among drive link, is fixed with annulus short
One end of bar and one end of stock, at grade, quarter butt is shorter than stock for quarter butt, stock and annulus, and the other end of quarter butt is consolidated
Due on shrouding, the extended line of quarter butt center line passes through the shrouding center of circle, and the other end of stock is fixed on lower ball float, rotating shaft both ends
It is fixed on cavity inner wall, is set in rotating shaft two locating pieces, annulus are placed in two locating pieces through rotating shaft, shrouding is tight
During by water inlet, cushion course is between shrouding and water inlet, and the tube hub line of lower horizontal tube is through the shrouding center of circle and vertical
In shrouding plane, locating rod both ends are fixed on cavity inner wall, and locating rod is parallel to rotating shaft and deviates the vertical direction of rotating shaft, locates
In the vertical direction of stock.
The permeable hole communicated is provided with above-mentioned water wing and cavity.
It is of the invention to be relative to the beneficial effect of prior art:The present invention can be when liquid level drops to predeterminated position, certainly
It is dynamic to seal at the suction inlet of siphon pipe, prevent siphon pipe from continuing to aspirate, cause to evacuate, being not required to next use will be again by siphon pipe
Pour water and form the condition that induction produces siphon, it is simple to operate, it is not necessary to which that the moment keeps a close watch on the change of liquid level.
Brief description of the drawings
Fig. 1 is that liquid level highest and stock are positioned sectional schematic diagram when pole spacing is lived in the cavity of the present invention.
Fig. 2 is sectional view when being used in mummifying pool of the present invention.
Fig. 3 is the sectional schematic diagram during liquid level decline in the cavity of the present invention.
Fig. 4 is sectional schematic diagram when liquid level is minimum and shrouding blocks lower horizontal tube water inlet in the cavity of the present invention.
Fig. 5 is the sectional schematic diagram that liquid level highest destroys vacuum mechanism work in shift position rear chamber of the present invention.
Fig. 6 is the sectional view of the raised platforms of the present invention.
Fig. 7 is the top view of the raised platforms of the present invention.
Fig. 8 is the profile of A-A in Fig. 4 of the invention.
Embodiment
The embodiment of the present invention is further described below in conjunction with the accompanying drawings, referring to Fig. 1-8.
A kind of water-fetching head 1 for preventing siphon pipe from evacuating of the present invention, including cavity 2, water wing 3, bend pipe 4, destruction vacuum machine
Structure 5 and enclosed mechanism 6 form.Cavity 2 is hollow, and the lower periphery surrounding of cavity 2 is fixed with water wing 3, has in the upper end system of cavity 2
Drawstring 11.Bend pipe 4 is made up of upper horizontal tube 41, lower horizontal tube 42, VERTICAL TUBE 43, upper elbow 44 and lower elbow 45, horizontal positioned
Upper horizontal tube 41 pass through the top of cavity 2, the one end 411 of upper horizontal tube 41 outside cavity 2 can pass through the connection flexible pipe of pipe collar 412
7 water inlet ends 71, one end of upper horizontal tube 41 elbow 44 in the other end connection in cavity 2, the other end of upper elbow 44 pass through
One end of the lower elbow 45 of the vertical connection of VERTICAL TUBE 43, the other end of lower elbow 45 are connected to horizontal positioned lower horizontal tube 42
One end, the other end of lower horizontal tube 42 is water inlet 421, and the current that being provided with VERTICAL TUBE 43 only allows to flow up pass through
Check-valves 431, the blast pipe 442 of air bleeding valve 441 is provided with upper elbow 44 vertically upward.
The above-mentioned top outer tube wall of lower horizontal tube 42 is sticked in the bottom of raised platforms 421, and the upper surface of raised platforms 421 is flat
Face, raised platforms and the lower outer tube wall of horizontal tube 42 are passed through by same perforation 422.
Above-mentioned destruction vacuum mechanism 5 includes latch 51, lower part series have the upper floating ball 53 of the one end of transmission rope 52, centre to be provided with
The support 55 of positioning hole 54, latch 51 are made up of inserted link 56 and pole cap 57, and the lower end of pole cap 57 sets cushion film 58, pole cap 57 and soft
The diameter of pad 58 is more than the diameter of perforation 422, is fixed with the one end of elastic threads 59 on pole cap 57, the other end of elastic threads 59 is fixed on
On the lower outer wall of horizontal tube 42, the other end of transmission rope 52 is fixed on the top of pole cap 57 through positioning hole 54, and positioning hole 54 is in pole cap
57 surface, support 55 are fixed on the inwall of cavity 2, and the diameter of inserted link 56 is less than 422 diameters of perforation, and inserted link 56 passes through perforation
422, when elastic threads 59 are in maximum tension state, inserted link 56 is still in perforation 422.
Above-mentioned enclosed mechanism 6 includes shrouding 61, drive link 62, lower ball float 63, rotating shaft 64 and locating rod 65, the surface of shrouding 61
Post one layer of cushion course 66, the diameter of shrouding 61 and cushion course 66 is more than the diameter of water inlet 421, in being set among drive link 62
Empty annulus 67, one end of quarter butt 68 and one end of stock 69 is fixed with annulus 67, quarter butt 68, stock 69 and annulus 67 are same
In one plane, quarter butt 68 is shorter than stock 69, and the other end of quarter butt 68 is fixed on shrouding 61, and the extended line of the center line of quarter butt 68 is worn
The center of circle of shrouding 61 is crossed, the other end of stock 69 is fixed on lower ball float 63, and the both ends of rotating shaft 64 are fixed on the inwall of cavity 2, rotating shaft
Set on 64 two locating pieces 641, annulus 67 are placed in two locating pieces 641 through rotating shaft 64, shrouding 61 is against intaking
During mouth 421, cushion course 66 is between shrouding 61 and water inlet 421, and the tube hub line of lower horizontal tube 42 is justified through shrouding 61
The heart is simultaneously fixed on the inwall of cavity 2 perpendicular to the plane of shrouding 61, the both ends of locating rod 65, and locating rod 65 is parallel to rotating shaft 64 and deviates
The vertical direction of rotating shaft 64, the vertical direction in stock 69.
The permeable hole 23 communicated is provided with above-mentioned water wing and cavity.
The use process of the present invention is as follows.
The one end 411 of upper horizontal tube 41 outside cavity 2 passes through the water inlet end 71 of 412 connection flexible pipe of pipe collar 7, the water side of flexible pipe 7
72 are nearby provided with gate valve 73, along some floating blocks 74 of the bottom fixed and arranged of flexible pipe 7.
Carried out outside mummifying pool 8 and induce the generation siphon condition preparation of flexible pipe 7.Gate valve 73 and air bleeding valve 441 are opened, from
The water side 72 of flexible pipe 7 pours into water, and gas is discharged by water from blast pipe 442 in flexible pipe 7, and the water in flexible pipe 7 is kept off by check-valves 431
In flexible pipe 7.After water being full of in flexible pipe 7, closing gate valve 441 and air bleeding valve 442.Such as Fig. 2, the water side 72 of flexible pipe 7 is put into clearly
In pond 9, the inner flexible tube 7 of clear water reserviors 9 is arranged into U-shaped 75, and upward, the highest liquid level of clear water reserviors 8 is less than mummifying pool to the water side 72 of flexible pipe 7
Bottom.Flexible pipe 7 bypasses dykes and dams 81, moves water-fetching head 1 to mummifying pool 8 center with drawstring 11 on dykes and dams 82 over there.
The position fixing process of water-fetching head 1 of the present invention is as follows:Such as Fig. 2, mummifying pool 8 continuously enters former mud within a period of time
When, flexible pipe 7 and water-fetching head 1 float on former mud liquid level all the time in the presence of floating block 74 and water wing 3.Stop into former mud
Supernatant 83 and precipitation mud 84 are formed after starching a period of time, in mummifying pool 8.Water-fetching head 1 is moved to tool using drawstring 11
There is supernatant 83 to cheat on innermost liquid level, during flexible pipe 7 and water-fetching head 1 is pulled, flexible pipe 7 and water-fetching head 1 by
Buoyancy and all the time on the supernatant 83, will not disturb supernatant 83 and precipitate mud 84 below causes supernatant 83 to become muddy
It is turbid.
Now, such as Fig. 1, under the buoyancy of water wing 3, water-fetching head 1 is swum on the face of supernatant 83, in upper floating ball 53
Buoyancy under, by the pull-up latch 51 of transmission rope 52, elastic threads 59 are in extended state, in the buoyancy of lower ball float 63
Under, drive link 62 64 rotates around the shaft, and stock 69 abuts locating rod 65, and quarter butt 68 and shrouding 61 64 turn to lower level around the shaft
The top of pipe 42.
The course of work of the present invention is as follows:Such as Fig. 2, open gate valve 73, under gravity in flexible pipe 7 water from flexible pipe 7
Water side 72 is flowed out, and vacuum is formed in flexible pipe 7, and supernatant 83 is pressed into the water inlet end 71 of flexible pipe 7 by atmospheric pressure from check-valves 431,
Clear water reserviors 9 are being flowed into by flexible pipe 7, flexible pipe 7 is internally formed siphonage.In the case of without additionaling power, by supernatant 83
Clear water reserviors 9 are discharged to, precipitation mud 84 surface is gradually exposed in air, is so advantageous to precipitate the surface moisture of mud 84 as early as possible
Evaporation, and be extruded using the internal moisture of mud 84 is precipitated and form new supernatant 83.When cavity 2 and the bottom of water wing 3 contact
When on to precipitation mud 84 face, supernatant 83 can only be passed through in cavity 2 from permeable hole 23.Such as Fig. 3, liquid level 22 in cavity 2
During decline, upper floating ball 53 drops on positioning hole 54, is no longer influenced by the pulling force of drawstring 52 on latch 51, and elastic threads 59 are by pole cap
57 are withdrawn into raised platforms 421, and cushion film 58 will the closure of perforation 422;Lower ball float 63 with cavity 2 liquid level 22 decline and under
Drop, drive link 62 64 rotate around the shaft under gravity.Such as Fig. 4, until shrouding 61 abuts the lower water inlet of horizontal tube 42
421, cushion course 66 blocks water inlet 421, and the water inlet end 71 of flexible pipe 7 in suction supernatant 83, does not prevent flexible pipe 7 from evacuating.In flexible pipe 7
Middle formation vacuum, arranged in the inner flexible tube 7 of clear water reserviors 9 into U-shaped 75, it is soft can effectively to prevent that air from entering from the water side 72 of flexible pipe 7
Pipe 7 and destroy vacuum state in flexible pipe 7, avoiding water side, nearby water flows completely out and destroys and induce flexible pipe 7 and produce rainbow in flexible pipe 7
The condition of suction.Otherwise the above-mentioned condition preparation done outside mummifying pool 8 and induce the siphonage of flexible pipe 7 will be carried out, to operation
Make troubles.Now, closing gate valve 72, vacuum state is still within flexible pipe 7.
Former mud uneven precipitation in mummifying pool 8, multiple supernatants 83 can be formed in mummifying pool 8 and cheated.Use drawstring
Water-fetching head 1 is moved to another supernatant 83 by 11 cheats on innermost liquid level.Under the buoyancy of water wing 3, water intake
Portion 1 is swum on the face of supernatant 83.Now, such as Fig. 5, under the buoyancy of upper floating ball 53, the pull-up latch of transmission rope 52 is passed through
51, elastic threads 52 are in extended state, and cushion film 58 departs from raised platforms 421, and water enters lower horizontal tube 42 through perforation 422
In, so as to flow in flexible pipe 7, the inner vacuum state of flexible pipe 7 is destroyed, pressure difference suffered by shrouding 61 reduces, in lower ball float 63
Under buoyancy, drive link 62 64 rotates around the shaft.Such as Fig. 1, until stock 69 abut locating rod 65, quarter butt 68 and shrouding 61 around
Rotating shaft 64 turns to the top of lower horizontal tube 42, and the entrance point 421 of lower horizontal tube 42 is opened.So repeat the work of the invention described above
Make process.
The position fixing process of the invention described above water-fetching head 1 and the course of work of the present invention are so repeated, until desiccation
The supernatant 83 that all supernatants 83 are cheated in pond 8 is discharged.Next period is waited continuously to enter former mud, will using the present invention
Supernatant is discharged into mummifying pool again.
Above-described embodiment is only presently preferred embodiments of the present invention, is not limited the scope of the invention according to this, therefore:It is all according to
The equivalence changes that structure, shape, the principle of the present invention is done, all should be covered by within protection scope of the present invention.
Claims (2)
1. a kind of water-fetching head for preventing siphon pipe from evacuating, including cavity, water wing, bend pipe, destruction vacuum mechanism and enclosed mechanism
Composition, the cavity are hollow, and cavity lower periphery surrounding is fixed with water wing, has drawstring in the upper end system of cavity;The bend pipe
It is made up of upper horizontal tube, lower horizontal tube, VERTICAL TUBE, upper elbow and lower elbow, horizontal positioned upper horizontal tube passes through cavity top,
By pipe collar connection flexible pipe water inlet end, upper horizontal tube is curved in the other end connection in cavity for the one end of upper horizontal tube outside cavity
One end of head, the other end of upper elbow connect one end of lower elbow by vertical VERTICAL TUBE, and the other end of lower elbow is connected to
One end of horizontal positioned lower horizontal tube, the other end of lower horizontal tube is water inlet, and being provided with VERTICAL TUBE only allows upwards
The check-valves that the current of flowing pass through, upper elbow are provided with the blast pipe of air bleeding valve vertically upward;It is characterized in that:It is described
Lower horizontal tube top outer tube wall is sticked in raised platforms bottom, and raised platforms upper surface is plane, raised platforms and lower horizontal tube
Outer tube wall by it is same perforation through;It is described destroy vacuum mechanism include latch, lower part series have transmission rope one end upper floating ball, in
Between be provided with the support of positioning hole, latch is made up of inserted link and pole cap, and pole cap lower end sets cushion film, pole cap and cushion film it is straight
Footpath is more than the diameter of perforation, and elastic threads one end is fixed with pole cap, and the elastic threads other end is fixed in lower horizontal pipe outer wall, transmission
The rope other end is fixed at the top of pole cap through positioning hole, and positioning hole is in the surface of pole cap, and support is fixed on cavity inner wall,
Inserted link diameter is less than penetration hole diameter, and inserted link is through perforation, and when elastic threads are in maximum tension state, inserted link is still in perforation
It is interior;The enclosed mechanism includes shrouding, drive link, lower ball float, rotating shaft and locating rod, and one layer of cushion course is posted on shrouding surface, envelope
The diameter of plate and cushion course is more than the diameter of water inlet, and hollow annulus is set among drive link, quarter butt is fixed with annulus
One end and one end of stock, at grade, quarter butt is shorter than stock for quarter butt, stock and annulus, and the other end of quarter butt is fixed on
On shrouding, the extended line of quarter butt center line passes through the shrouding center of circle, and the other end of stock is fixed on lower ball float, and rotating shaft both ends are fixed
On cavity inner wall, set in rotating shaft two locating pieces, annulus are placed in two locating pieces through rotating shaft, shrouding abut into
During the mouth of a river, cushion course is between shrouding and water inlet, and the tube hub line of lower horizontal tube is through the shrouding center of circle and perpendicular to envelope
Plate plane, locating rod both ends are fixed on cavity inner wall, and locating rod is parallel to rotating shaft and deviates the vertical direction of rotating shaft, in length
The vertical direction of bar.
A kind of 2. water-fetching head for preventing siphon pipe from evacuating according to claim 1, it is characterised in that:The water wing and chamber
The permeable hole communicated is provided with body.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201720523795.3U CN206721984U (en) | 2017-05-04 | 2017-05-04 | A kind of water-fetching head for preventing siphon pipe from evacuating |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201720523795.3U CN206721984U (en) | 2017-05-04 | 2017-05-04 | A kind of water-fetching head for preventing siphon pipe from evacuating |
Publications (1)
Publication Number | Publication Date |
---|---|
CN206721984U true CN206721984U (en) | 2017-12-08 |
Family
ID=60510095
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN201720523795.3U Expired - Fee Related CN206721984U (en) | 2017-05-04 | 2017-05-04 | A kind of water-fetching head for preventing siphon pipe from evacuating |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN206721984U (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107142998A (en) * | 2017-05-04 | 2017-09-08 | 台州学院 | A kind of water-fetching head for preventing siphon pipe from evacuating |
-
2017
- 2017-05-04 CN CN201720523795.3U patent/CN206721984U/en not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107142998A (en) * | 2017-05-04 | 2017-09-08 | 台州学院 | A kind of water-fetching head for preventing siphon pipe from evacuating |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN105804059B (en) | Drilling pouring pile hole device and method | |
CN106320353B (en) | A kind of construction method of basement construction Yield rainfall relation device | |
WO2021097937A1 (en) | Long tunnel water drainage system | |
CN206438486U (en) | A kind of greening side slope drainage system | |
CN207568570U (en) | Water drainage gas production device | |
WO2021097936A1 (en) | River bank slope water drainage system | |
CN104963322A (en) | Hydraulic junction facility | |
CN206721984U (en) | A kind of water-fetching head for preventing siphon pipe from evacuating | |
WO2011162620A1 (en) | Liquid flow system | |
CN206408667U (en) | A kind of backwater gate bottom Accrete clearing device | |
CN105926661B (en) | The negative pressure cylinder base of the offshore wind farm of soil plug can be eliminated | |
CN205296100U (en) | Husky equipment is arranged in reservoir segmentation | |
WO2021097939A1 (en) | Coastal slope drainage system | |
CN106759757A (en) | Turbine power drawing-in type toilet | |
CN107142998A (en) | A kind of water-fetching head for preventing siphon pipe from evacuating | |
CN105297673B (en) | Bank self-circulation type aeration Accrete clearing device and control method for Landscape River lake | |
CN110820776A (en) | Siphon drainage system for blind ditch of foundation pit | |
CN207452926U (en) | A kind of instrument for improving Application of light well point precipitation efficiency | |
CN206681105U (en) | Turbine power drawing-in type closestool | |
CN106968326A (en) | A kind of movable siphonal water decanter | |
CN206647046U (en) | A kind of PHC pipe piles core device native clearly | |
KR200450997Y1 (en) | Apparatus for carrying mass liquid by the difference in elevation between two obstacles | |
CN206693376U (en) | A kind of movable siphonal water decanter | |
CN108442970A (en) | A kind of inflation dredged tunnel drainage system and method | |
JP2004000885A (en) | Clogging prevention apparatus for water collecting pipe for ground water removal facility |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
GR01 | Patent grant | ||
GR01 | Patent grant | ||
CF01 | Termination of patent right due to non-payment of annual fee | ||
CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171208 Termination date: 20180504 |