CN113463741A - Double-well chamber filter well - Google Patents

Double-well chamber filter well Download PDF

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Publication number
CN113463741A
CN113463741A CN202110755859.3A CN202110755859A CN113463741A CN 113463741 A CN113463741 A CN 113463741A CN 202110755859 A CN202110755859 A CN 202110755859A CN 113463741 A CN113463741 A CN 113463741A
Authority
CN
China
Prior art keywords
well
baffle
inlet tube
pipe
lantern ring
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.)
Withdrawn
Application number
CN202110755859.3A
Other languages
Chinese (zh)
Inventor
吴帆帆
王志勇
袁涛
郭志鹏
徐丫力
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Taizhou University
Original Assignee
Taizhou University
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Taizhou University filed Critical Taizhou University
Priority to CN202110755859.3A priority Critical patent/CN113463741A/en
Publication of CN113463741A publication Critical patent/CN113463741A/en
Withdrawn legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03FSEWERS; CESSPOOLS
    • E03F1/00Methods, systems, or installations for draining-off sewage or storm water
    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03CDOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER; SINKS
    • E03C1/00Domestic plumbing installations for fresh water or waste water; Sinks
    • E03C1/12Plumbing installations for waste water; Basins or fountains connected thereto; Sinks
    • E03C1/122Pipe-line systems for waste water in building
    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03CDOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER; SINKS
    • E03C1/00Domestic plumbing installations for fresh water or waste water; Sinks
    • E03C1/12Plumbing installations for waste water; Basins or fountains connected thereto; Sinks
    • E03C1/122Pipe-line systems for waste water in building
    • E03C1/1222Arrangements of devices in domestic waste water pipe-line systems
    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03FSEWERS; CESSPOOLS
    • E03F1/00Methods, systems, or installations for draining-off sewage or storm water
    • E03F1/006Pneumatic sewage disposal systems; accessories specially adapted therefore
    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03FSEWERS; CESSPOOLS
    • E03F11/00Cesspools
    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03FSEWERS; CESSPOOLS
    • E03F3/00Sewer pipe-line systems
    • E03F3/04Pipes or fittings specially adapted to sewers
    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03FSEWERS; CESSPOOLS
    • E03F5/00Sewerage structures
    • E03F5/02Manhole shafts or other inspection chambers; Snow-filling openings; accessories
    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03FSEWERS; CESSPOOLS
    • E03F5/00Sewerage structures
    • E03F5/02Manhole shafts or other inspection chambers; Snow-filling openings; accessories
    • E03F5/021Connection of sewer pipes to manhole shaft
    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03FSEWERS; CESSPOOLS
    • E03F5/00Sewerage structures
    • E03F5/04Gullies inlets, road sinks, floor drains with or without odour seals or sediment traps
    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03FSEWERS; CESSPOOLS
    • E03F5/00Sewerage structures
    • E03F5/04Gullies inlets, road sinks, floor drains with or without odour seals or sediment traps
    • E03F5/0401Gullies for use in roads or pavements
    • E03F5/0403Gullies for use in roads or pavements with a sediment trap
    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03FSEWERS; CESSPOOLS
    • E03F5/00Sewerage structures
    • E03F5/04Gullies inlets, road sinks, floor drains with or without odour seals or sediment traps
    • E03F5/0401Gullies for use in roads or pavements
    • E03F5/0404Gullies for use in roads or pavements with a permanent or temporary filtering device; Filtering devices specially adapted therefor
    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03FSEWERS; CESSPOOLS
    • E03F5/00Sewerage structures
    • E03F5/04Gullies inlets, road sinks, floor drains with or without odour seals or sediment traps
    • E03F5/041Accessories therefor
    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03FSEWERS; CESSPOOLS
    • E03F5/00Sewerage structures
    • E03F5/14Devices for separating liquid or solid substances from sewage, e.g. sand or sludge traps, rakes or grates
    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03FSEWERS; CESSPOOLS
    • E03F7/00Other installations or implements for operating sewer systems, e.g. for preventing or indicating stoppage; Emptying cesspools
    • E03F7/10Wheeled apparatus for emptying sewers or cesspools
    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03FSEWERS; CESSPOOLS
    • E03F7/00Other installations or implements for operating sewer systems, e.g. for preventing or indicating stoppage; Emptying cesspools
    • E03F7/10Wheeled apparatus for emptying sewers or cesspools
    • E03F7/106Accessories, e.g. hose support
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00Water conservation; Efficient water supply; Efficient water use
    • Y02A20/20Controlling water pollution; Waste water treatment
    • Y02A20/208Off-grid powered water treatment
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00Adapting or protecting infrastructure or their operation
    • Y02A30/60Planning or developing urban green infrastructure

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  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Structural Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Sewage (AREA)

Abstract

The invention discloses a double-well chamber filter well. The device comprises two well chambers, a well cover and a filter barrel, wherein the well chambers are provided with a water inlet pipe, an overflow pipe and a drain pipe, and the drain pipe is communicated with the overflow pipe; the manhole cover is provided with a hole and a baffle with a through hole, a support rod is fixed on the side edge of the baffle, a lantern ring is fixed on the support rod, a vertical rod penetrates through the lantern ring, a stop block is arranged on the vertical rod and is arranged at the lower part of the lantern ring, a floating ball is arranged at the lower end of the vertical rod, and the baffle is arranged between a water inlet pipe and an overflow pipe; the inlet tube has skew part, has the constant head tank of two concave arc recess of "W" type on the baffle, and the ring lower extreme is fixed with the vertical slide of fluting, and the one end of dog is passed the fluting and is set up by the swash plate of last to the baffle slope down, and the swash plate is in between constant head tank and the inlet tube export and in the inlet tube below. According to the invention, the floating ball, the vertical rod and the flexible circular truncated cone can effectively and continuously remind a user of cleaning trapped matters in the filter barrel, and meanwhile, the double well chambers can delay the time of overflowing sewage.

Description

Double-well chamber filter well
Technical Field
The invention relates to a filtering and settling well, in particular to a double-well chamber filtering well for kitchen sewage.
Background
Before the sewage enters a pipe network or an oil separation tank, most of solid matters in the kitchen sewage need to be separated. However, the current method is that after kitchen sewage is discharged from home, an inspection well with a falling bottom is arranged, and after the sewage passes through the inspection well, a large amount of solid matters still flow out along with the sewage. The inconvenient clearance of the solid matter of sediment department to falling to the end because the well lid is covering, the inside condition of unable observation well leads to in time drawing clearly, and a large amount of solid matter flow. At present, the filter vat is arranged in the inspection well, the condition in the filter vat can not be observed in time by a user due to the existence of the well lid, the liquid level indication in the well can not be observed in real time and can not be cleaned in time, and the sewage overflow can be easily caused by the capacity of a single well chamber and the filter vat.
Disclosure of Invention
Aiming at the prior art, the invention aims to provide a double-well chamber filter well which can be used at the front end of a sewage system to remove solid impurities in kitchen sewage.
In order to solve the technical problem, the invention discloses a double-well chamber filter well which comprises two well chambers separated by a middle partition plate, two corresponding well covers and a filter barrel which can move in the well chambers. And a water inlet pipe is arranged on the wall of the well on the upper part of the well chamber, an overflow pipe is arranged on the wall of the well chamber, and a water drainage pipe is arranged on the wall of the well on the lower part of the well chamber and is communicated with the overflow pipe. The manhole cover is arranged in the well room upper end, is provided with the trompil on the well lid, sets up below the well lid and has a fenestrate baffle, and the baffle side is fixed with the bracing piece, is fixed with the lantern ring on the bracing piece, has the montant to pass in the lantern ring, is provided with the dog on the montant, and the lantern ring lower part is arranged in to the dog, and the montant lower extreme is provided with the floater, and the baffle is arranged in between inlet tube and the overflow pipe. The upper end of the filter barrel is lower than the lower end of the baffle plate, and filter holes are formed in the filter barrel. The inlet tube of two well rooms is same root inlet tube, inlet tube part pipeline section is flexible material's skew part, the baffle upper end is provided with the constant head tank of two concave arc recesses of "W" type, the inlet tube can arrange the recess on the constant head tank in, the constant head tank is below the pipeline section between skew part and the inlet tube export, the lantern ring lower extreme is fixed with the vertical slide of fluting, the one end of dog is passed the fluting and is set up by the swash plate to the baffle slope from top to bottom, the swash plate is in between constant head tank and the inlet tube export and in the inlet tube below.
Further, a circular table made of flexible materials is arranged at the top end of the vertical rod, the diameter of the upper end of the circular table is smaller than that of the opening, and the diameter of the lower end of the circular table is larger than that of the opening.
Furthermore, the outlet of the water inlet pipe is provided with a 90-degree elbow, and the partition plate below the outlet of the elbow is lower than the height of the outlet of the elbow.
Compared with the prior art, the invention has the beneficial effects that: 1. the water level condition in the well chamber can be fed back in time through the floating ball, the vertical rod and the flexible circular truncated cone, and the flexible circular truncated cone cannot fall once protruding out of the well cover, so that a user is effectively and continuously reminded of clearing trapped objects in the filter barrel; 2. when a well chamber is not cleared up in time, the stop block on the vertical rod can move the water inlet pipe, and the outlet of the water inlet pipe is positioned in another standby well chamber, so that the sewage is prevented from overflowing.
Drawings
FIG. 1 is a schematic cross-sectional view of a twin well filtration well according to the present invention.
Fig. 2 is a schematic view of the section a-a in fig. 1.
Fig. 3 is a schematic view of section B-B in fig. 1.
FIG. 4 is a schematic cross-sectional view of the outlet of the water pipe being moved into one chamber after the chamber is filled with solids trapped therein.
FIG. 5 is a schematic cross-sectional view of two well chambers of the present invention after the chambers are filled with solids.
FIG. 6 is a schematic sectional view showing the construction of the sewage when it flows out from the overflow pipe in the present invention.
Detailed Description
The invention is further described in the following with specific embodiments in conjunction with the accompanying drawings.
Referring to fig. 1 to 3, a double well filter well includes two well chambers 100, 200 separated by a middle partition 300, corresponding two well lids 400, 500, and filter buckets 600, 700 movable inside the well chambers 100, 200. The water inlet pipe 800 is arranged on the upper well wall of the well chamber 100, 200, the overflow pipe 101, 201 is arranged on the well chamber 100, 200, the water outlet pipe 102, 202 is arranged on the lower well wall of the well chamber 100, 200, and the water outlet pipe 102, 202 is communicated with the overflow pipe 101, 201. The well lid 400, 500 is arranged at the upper end of the well chamber 100, 200, the well lid 400, 500 is provided with an opening 401, 501, a baffle 403, 503 with a through hole 402, 502 is arranged under the well lid 400, 500, the side of the baffle 403, 503 is fixed with a support rod 404, 504, the support rod 404, 504 is fixed with a lantern ring 405, 505, a vertical rod 406, 506 penetrates through the lantern ring 405, 505, the vertical rod 406, 506 is provided with a stop block 407, 507, the stop block 407, 507 is arranged at the lower part of the lantern ring 405, 505, the lower end of the vertical rod 406, 506 is provided with a floating ball 408, 508, and the baffle 403, 503 is arranged between the water inlet pipe 800 and the overflow pipe 101, 201. The upper ends of the filter barrels 600 and 700 are lower than the lower ends of the baffles 403 and 503, and the filter barrels 600 and 700 are provided with filter holes 601 and 701.
The water inlet conduits 800 of both chambers 100, 200 are the same water inlet conduit 800, and a portion of the length of the water inlet conduit 800 is an offset section 801 of flexible material. The upper end of the baffle 300 is provided with a W-shaped positioning groove 301 with two concave arc grooves, the water inlet pipe 800 can be arranged in the groove on the positioning groove 301, and the positioning groove 301 is arranged below the pipe section between the offset component 801 and the outlet of the water inlet pipe 800. The lower ends of the collars 405 and 505 are fixed with vertical sliding plates 410 and 510 with slots 409 and 509, one ends of the stoppers 407 and 507 penetrate through the slots 409 and 509 and are provided with inclined plates which are inclined from top to bottom towards the partition 300, and the inclined plates are positioned between the positioning grooves 301 and the outlet of the water inlet pipe 800 and below the water inlet pipe 800.
The top ends of the vertical rods 406 and 506 are provided with round tables 411 and 511 made of flexible materials, the diameters of the upper ends of the round tables 411 and 511 are smaller than those of the openings 401 and 501, and the diameters of the lower ends of the round tables 411 and 511 are larger than those of the openings 401 and 501.
The outlet of the inlet pipe 800 is provided with a 90-degree elbow 802, and the baffle 300 below the outlet of the elbow 802 is lower than the outlet of the elbow 802.
The following describes the use of the present invention in detail.
First well filtration process: when the outlet of the water inlet pipe 800 is in the first well 100, the water inlet pipe 800 is in the first groove of the positioning groove 301. After the water inlet pipe 800 enters the waste water containing kitchen waste solids, the free water flows through the filtering holes 601, flows into the gap between the outer wall of the filtering barrel 600 and the inner wall of the well chamber 100, then enters the drain pipe 102, and flows into the sewage pipe network system. Large particles of solid matter are trapped inside the filter tub 600 by the filter holes 601. When the solid matters are deposited more, only a small amount of filtrate will flow out of the filter vat 600 through the filter holes 601 covered by the filtrate, and most of the filtrate will flow out through the filter holes 601 of the filter vat 600 which are not covered by the solid matters.
Referring to fig. 4, when the solid matters deposited in the filtering barrel 600 cover all the filtering holes 601, the solid particles in the influent wastewater continue to be trapped by the deposited solid matters, and the upper wastewater is blocked by the deposited solid matters and slowly permeates through the deposited solid matters and the filtering holes 601 under the action of gravity. When more and more solid matters are deposited on the upper part of the filter barrel 600, the sewage is not ready to be discharged out of the filter barrel 300, the water level rises and exceeds the floating ball 408, so that the floating ball 408 floats upwards, the vertical rod 406 limited by the lantern ring 405 is pushed upwards by the floating ball 408 to move upwards, and the round platform 411 can be deformed under pressure, so that the upper end and the lower end of the round platform can pass through the open hole 401.
The stopper 407 also moves upward, the sloping plate on the stopper 407 pushes the water inlet pipe 800 upward at the same time, the water inlet pipe 800 moves upward around the offset component 801, and simultaneously under the action of gravity, the water inlet pipe 800 slides downward along the sloping plate until the water inlet pipe 800 turns over the convex part between the two concave grooves of the positioning groove 301, the water inlet pipe 800 breaks away from the stopper 407 and slides into the second concave groove on the positioning groove 301, and the outlet of the water inlet pipe 800 is located in the second well 200.
Water does not enter the first well chamber 100, water in the well chamber 100 can slowly seep out, the liquid level is lowered, the floating ball 408 is lowered until the lower end of the circular truncated cone 411 is abutted to the upper surface of the well cover 400 and does not fall any more.
First well 100 filter vat 600 cleaning process: the user rises the well lid 400 through observing the round platform 411 on the montant 406 in the first well room 100, opens the well lid 400 in time, through the lift member such as the bail or the lifting rope on the filter vat 600, takes out the filter vat 600, pours and properly handles the material in the filter vat 600 to wash the filtration pore 601 on the filter vat 600, guarantee the unblocked of filtration pore 601. The filter barrel 600 is placed back into the well chamber 100 and covered back to the well lid 400, and the lower end of the circular truncated cone 411 is pressed to enable the diameter of the circular truncated cone to be smaller than the diameter of the opening 401 and is lowered to the position below the well lid 400 to be used next time.
When the water inlet pipe 800 feeds water into the second well 200, the second well 200 is filtered in the same way as the first well 100. The cleaning process of the filter basket 700 of the second well 200 and the cleaning process of the filter basket 600 of the first well 100 are also the same.
Referring to fig. 5, if the filter barrel 600 in the first well chamber 100 is not cleaned when the liquid level in the second well chamber 200 exceeds the floating ball 508, at this time, the circular truncated cone 511 is above the well cover 500, and the sloping plates on the stoppers 507 lift the water inlet pipe 800, so that the water inlet pipe 800 is positioned between the sloping plates on the stoppers 407 and 507 on both sides, and the outlet of the water inlet pipe 800 is above the partition 300. The water inlet pipe 800 will simultaneously feed water to both chambers 100, 200.
Referring to fig. 6, when the user does not observe in time that the bosses 411, 511 on the vertical rods 406, 506 have risen, more and more solid matter is deposited in the filter vat 600, 700 and in the upper part of the well 100, 200. When the water inflow is large, the water level of the upper part in the well chamber 100, 200 rises sharply and exceeds the top end of the filter barrel 600, 700. The water level rises and exceeds the lower end of the baffle 403, 503, and at this time, the sewage flows to the overflow pipe 101, 201 through the perforation 402, 502 on the baffle 403, 503 and then enters the drain pipe 102, 202 through the overflow pipe 101, 201, and the solid matters can not pass through the perforation 402, 502 and are trapped, so that the sewage can be discharged in time. At this time, as long as the user finds that the round tables 411 and 511 on the vertical rods 406 and 506 are lifted out of the well lids 400 and 500 in time and clean the well lids in time, no sewage overflows from the well lids 400 and 500 to cause pollution.
When the user still does not find the circular truncated cones 411 and 511 on the vertical rods 406 and 506 to be lifted out of the manhole covers 400 and 500 in time, the space of the manhole chambers 100 and 200 between the water inlet pipe 800 and the baffle plates 403 and 503 is gradually filled with solid materials, and the through holes 402 and 502 capable of passing water are less and less. When the sewage has not come to the overflow pipe 101, 201 from the through hole 402, 502, the liquid level in the well chamber 100, 200 rises and overflows from the well lid 400, 500.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims (3)

1. The utility model provides a twin-well room filtering well, includes by two well rooms that intermediate bottom is divided, two well lids that correspond and the inside mobilizable filter vat of well room, be provided with the inlet tube on the wall of a well on well room upper portion, be provided with the overflow pipe on the wall of a well room, be provided with the drain pipe on the wall of a well room lower part wall of a well, the well room upper end is arranged in to the drain pipe, is provided with the trompil on the well lid, sets up below the well lid and has fenestrate baffle, and the baffle side is fixed with the bracing piece, is fixed with the lantern ring on the bracing piece, has the montant to pass in the lantern ring, is provided with the dog on the montant, and the lantern ring lower part is arranged in to the dog, and the montant lower extreme is provided with the floater, and the baffle is arranged in between inlet tube and the overflow pipe, the filter vat upper end is less than the lower extreme of baffle, is provided with filtration pore, its characterized in that: the inlet tube of two well rooms is same root inlet tube, inlet tube part pipeline section is flexible material's skew part, the baffle upper end is provided with the constant head tank of two concave arc recesses of "W" type, the inlet tube can arrange the recess on the constant head tank in, the constant head tank is below the pipeline section between skew part and the inlet tube export, the lantern ring lower extreme is fixed with the vertical slide of fluting, the one end of dog is passed the fluting and is set up by the swash plate to the baffle slope from top to bottom, the swash plate is in between constant head tank and the inlet tube export and in the inlet tube below.
2. A twin well filter well according to claim 1 wherein: the top end of the vertical rod is provided with a round table made of flexible materials, the diameter of the upper end of the round table is smaller than that of the opening, and the diameter of the lower end of the round table is larger than that of the opening.
3. A twin well filter well according to claim 1 wherein: the outlet of the water inlet pipe is provided with a 90-degree elbow, and the partition plate below the outlet of the elbow is lower than the height of the outlet of the elbow.
CN202110755859.3A 2021-07-05 2021-07-05 Double-well chamber filter well Withdrawn CN113463741A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110755859.3A CN113463741A (en) 2021-07-05 2021-07-05 Double-well chamber filter well

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110755859.3A CN113463741A (en) 2021-07-05 2021-07-05 Double-well chamber filter well

Publications (1)

Publication Number Publication Date
CN113463741A true CN113463741A (en) 2021-10-01

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ID=77878002

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110755859.3A Withdrawn CN113463741A (en) 2021-07-05 2021-07-05 Double-well chamber filter well

Country Status (1)

Country Link
CN (1) CN113463741A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117306670A (en) * 2023-11-28 2023-12-29 青岛新世纪预制构件有限公司 Prefabricated drainage well

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117306670A (en) * 2023-11-28 2023-12-29 青岛新世纪预制构件有限公司 Prefabricated drainage well
CN117306670B (en) * 2023-11-28 2024-02-23 青岛新世纪预制构件有限公司 Prefabricated drainage well

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WW01 Invention patent application withdrawn after publication

Application publication date: 20211001

WW01 Invention patent application withdrawn after publication