CN110512652A - It is a kind of to carry the heavy ductile cast iron manhole cover for reaching F900 - Google Patents
It is a kind of to carry the heavy ductile cast iron manhole cover for reaching F900 Download PDFInfo
- Publication number
- CN110512652A CN110512652A CN201910799490.9A CN201910799490A CN110512652A CN 110512652 A CN110512652 A CN 110512652A CN 201910799490 A CN201910799490 A CN 201910799490A CN 110512652 A CN110512652 A CN 110512652A
- Authority
- CN
- China
- Prior art keywords
- manhole cover
- cover plate
- cast iron
- bracket
- ductile cast
- 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.)
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/12—Manhole shafts; Other inspection or access chambers; Accessories therefor
- E02D29/14—Covers for manholes or the like; Frames for covers
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/12—Manhole shafts; Other inspection or access chambers; Accessories therefor
- E02D29/14—Covers for manholes or the like; Frames for covers
- E02D29/1427—Locking devices
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0026—Metals
- E02D2300/0029—Steel; Iron
- E02D2300/0031—Steel; Iron in cast iron form
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
The invention discloses the heavy ductile cast iron manhole covers that a kind of carrying reaches F900, including lower water assembly A and Manhole cover assembly A, multiple groups Manhole cover assembly A is fixedly mounted on lower water assembly A, the bottom of manhole cover plate A is fixedly connected by spring fastenings with card slot, increase the positional stability of manhole cover plate A, it prevents alice and digs, gap of the surface waste water between manhole cover plate A and the inner wall of installation set flows into, it is flowed into lower flume from side permeable hole and top permeable hole again, realize the drain function of well lid, when the inflow of single well lid is less than the displacement of lower flume, water flow jacks up manhole cover plate A, again under the action of spring fastenings, manhole cover plate A is held, manhole cover plate A is caused to vibrate up and down, prevent the impurity in sewage from blocking side permeable hole and top permeable hole, multiple bracket A intersect to form network, the grid Structure setting increase manhole cover plate A bearing capacity, avoid because carry it is excessive caused by manhole cover plate A structural failure.
Description
Technical field
The present invention relates to plumbing technical fields, specially a kind of to carry the heavy ductile cast iron manhole cover for reaching F900.
Background technique
Well lid prevents people or object from falling for covering road or family's middle-deep well, by material can be divided into metal well lid,
High strength fibre cement concrete well lid and Resin man-hole cover etc., it is general using circle, it can be used for greenbelt, pavement, motor vehicle
The places such as road, harbour and lane, the drainage pipeline below well lid connect municipal drainage system, when precipitation is larger, drainpipe
Water flow inside road is larger, and the inflow of single well lid is less than the water yield that drainage pipeline conveys outward, then will lead to well lid quilt
The phenomenon that water flow jacks up uses simple clamp-close type mounting structure between existing well lid and pipeline, when well lid is jacked up, with
Water flow flow direction it is different, the position of well lid can also change, and the position of well lid often occurs after displacement retracts
Mobile or alice, seriously affects citizens' activities；Well lid is that edge engages with pipeline when installing, and is not obtained at well lid center good
Support, when well lid be pressurized it is excessive when, well lid be easy be pressurized extend cause deform so that occur crack damage, service life is not
Long, bearing capacity is not high.
Summary of the invention
The purpose of the present invention is to provide the heavy ductile cast iron manhole covers that a kind of carrying reaches F900, pass through spring fastenings
Setting, realize installation and fixation to manhole cover plate A, increase the positional stability of manhole cover plate A, reduce stolen possibility, prevent
It alice and digs；It drives manhole cover plate A to vibrate up and down by the restoring force effect of spring fastenings, prevents the impurity in sewage from blocking
Side permeable hole and top permeable hole, accelerate lower row's speed of sewage, practicability is more preferably；Well is corrected by cross one another bracket A
The micro-strain of cover board A, thus avoid because carry it is excessive caused by manhole cover plate A structural failure, covert increase manhole cover plate A's holds
Power is carried, to solve to propose in above-mentioned background technique using simple clamp-close type mounting structure between well lid and pipeline, when well lid quilt
When jack-up, as the flow direction of water flow is different, the position of well lid can also change, and the position of well lid is past after displacement retracts
Toward mobile or alice can occur, citizens' activities are seriously affected；Well lid is that edge engages with pipeline when installing, and is not had at well lid center
Good support is obtained, when well lid compression is excessive, well lid is easy to be pressurized to extend to cause to deform occurs crack damage in turn, uses
Service life is not grown, the not high problem of bearing capacity.
To achieve the above object, the invention provides the following technical scheme: a kind of carry the heavy spheroidal graphite cast-iron for reaching F900
Well lid, including lower water assembly A and Manhole cover assembly A, multiple groups Manhole cover assembly A is fixedly mounted on lower water assembly A, and lower water assembly A includes
Multiple groups are arranged in lower flume, intercept net and mounting hole, intercept net, and multiple groups intercept net is equidistantly fixedly mounted on the inside of lower flume, under
The top surface of sink equidistantly processes multiple mounting holes, and Manhole cover assembly A is fixedly mounted in the inside of mounting hole；
Manhole cover assembly A includes installation set, card slot, spring fastenings, manhole cover plate A, side permeable hole, top permeable hole, bracket A
With connection shaft A, the outer wall of installation set is fixedly connected with mounting hole, the card slot of the inner wall fixed setting annular of installation set, card slot
Engage with the bottom of manhole cover plate A, multiple spring fastenings, the side wall of manhole cover plate A is fixedly mounted in the junction of card slot and manhole cover plate A
Multiple groups side permeable hole is angularly processed, the top surface of manhole cover plate A processes multiple top permeable holes, the equal manhole cover plate A's in the both ends of bracket A
On inner wall, bracket A setting is multiple, and multiple bracket A intersect to form network, and the infall of the network is living
Dynamic suit connection shaft A.
Preferably, the installation set and manhole cover plate A are disposed as circular configuration, and the outer diameter of manhole cover plate A is less than installation
The internal diameter of set.
Preferably, the spring fastenings are fixed on the inside of card slot.
Preferably, the manhole cover plate A and bracket A is all made of ductile cast iron material and is made.
Preferably, the flush on the surface of the manhole cover plate A and lower flume.
Compared with prior art, the beneficial effects of the present invention are:
1, a kind of carrying provided by the invention reaches the heavy ductile cast iron manhole cover of F900, and the bottom of manhole cover plate A passes through bullet
Spring connector is fixedly connected with card slot, realizes installation and fixation to manhole cover plate A, increases the positional stability of manhole cover plate A, is reduced
Stolen possibility, prevents alice and digs.
2, a kind of carrying provided by the invention reaches the heavy ductile cast iron manhole cover of F900, when the inflow of single well lid is small
When the displacement of lower flume, rapid stream can jack up manhole cover plate A in lower flume, achieve the purpose that pressure release, but in bullet
Under the restoring force effect of spring connector, manhole cover plate A is held and is sprung back, and and so on leads to the vibration of manhole cover plate A or more back and forth,
It prevents the impurity in sewage from blocking side permeable hole and top permeable hole, accelerates lower row's speed of sewage, practicability is more preferably.
3, a kind of carrying provided by the invention reaches the heavy ductile cast iron manhole cover of F900, and multiple bracket A intersect
Network is formed, which is fixed on the inside of manhole cover plate A, and when manhole cover plate A stress is larger, which is set
The bearing capacity for increasing manhole cover plate A is set, and larger in stress so that the network can when micro-strain occurs for manhole cover plate A
Correct manhole cover plate A micro-strain, thus avoid because carry it is excessive caused by manhole cover plate A structural failure, covert increase well lid
The bearing capacity of plate A.
Detailed description of the invention
Fig. 1 is the overall structure diagram of the embodiment of the present invention one；
Fig. 2 is the Manhole cover assembly A structural schematic diagram of the embodiment of the present invention one；
Fig. 3 is the manhole cover plate A internal structure stereoscopic schematic diagram of the embodiment of the present invention one；
Fig. 4 is the bracket A original state schematic top plan view of the embodiment of the present invention one；
Fig. 5 is the bracket A variable condition schematic top plan view of the embodiment of the present invention one；
Fig. 6 is the overall structure diagram of the embodiment of the present invention two；
Fig. 7 is part A component enlarged diagram in attached drawing 6 of the present invention；
Fig. 8 is the Manhole cover assembly B structure schematic diagram of the embodiment of the present invention two；
Fig. 9 is the manhole cover plate B schematic diagram of internal structure of the embodiment of the present invention two.
In figure: 1, lower water assembly A；11, lower flume；12, intercept net；13, mounting hole；2, Manhole cover assembly A；21, installation set；
22, card slot；23, spring fastenings；24, manhole cover plate A；25, side permeable hole；26, permeable hole is pushed up；27, bracket A；28, connection turns
Axis A；3, lower water assembly B；31, sewer；32, strainer；33, mounting groove；4, Manhole cover assembly B；41, draw runner；42, manhole cover plate B；
43, water-carrying groove；44, bracket；45, bracket B；46, shaft B is connected.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Embodiment one:
Referring to Fig. 1, a kind of carry the heavy ductile cast iron manhole cover for reaching F900, including lower water assembly A1 and Manhole cover assembly
Multiple groups Manhole cover assembly A2 is fixedly mounted on A2, lower water assembly A1, lower water assembly A1 includes lower flume 11, intercept net 12 and mounting hole
13, multiple groups are arranged in intercept net 12, and multiple groups intercept net 12 is equidistantly fixedly mounted on the inside of lower flume 11, the top surface etc. of lower flume 11
Away from multiple mounting holes 13 are processed, Manhole cover assembly A2 is fixedly mounted in the inside of mounting hole 13.
Please refer to Fig. 2-5, Manhole cover assembly A2 includes that installation set 21, card slot 22, spring fastenings 23, manhole cover plate A24, side are saturating
Water hole 25, top permeable hole 26, bracket A27 and connection shaft A28, the outer wall of installation set 21 are fixedly connected with mounting hole 13, are pacified
The card slot 22 of the inner wall fixed setting annular of encapsulation 21, card slot 22 engage with the bottom of manhole cover plate A24, card slot 22 and manhole cover plate
Multiple spring fastenings 23 are fixedly mounted in the junction of A24, and the side wall of manhole cover plate A24 angularly processes multiple groups side permeable hole 25,
The top surface of manhole cover plate A24 processes multiple top permeable holes 26, on the inner wall of the equal manhole cover plate A24 in the both ends of bracket A27, bracket
A27 setting is multiple, and multiple bracket A27 intersect to form network, the equal movable sleeve load of the infall of the network
Switch through axis A28, installation set 21 and manhole cover plate A24 are disposed as circular configuration, and the outer diameter of manhole cover plate A24 is less than installation set 21
Internal diameter, spring fastenings 23 are fixed on the inside of card slot 22, and manhole cover plate A24 and bracket A27 are all made of spheroidal graphite cast-iron
Material is made, the surface of manhole cover plate A24 and the flush of lower flume 11.
Manhole cover plate A24: being fastened on the inside of card slot 22 by working principle, and the bottom of manhole cover plate A24 passes through spring fastenings
23 are fixedly connected with card slot 22, realize installation and fixation to manhole cover plate A24, increase the positional stability of manhole cover plate A24, reduce
Stolen possibility, prevents alice and digs, and the outer diameter of manhole cover plate A24 is less than the internal diameter of installation set 21, so well lid
There are gap between plate A24 and the inner wall of installation set 21, surface waste water first flows into the gap, then from side permeable hole 25 and pushes up permeable
It is flowed into hole 26 in lower flume 11, lower flume 11 accesses municipal drainage system, the drain function of well lid is realized, when single well lid
Inflow when being less than the displacement of lower flume 11, rapid stream can jack up manhole cover plate A24 in lower flume 11, reach pressure release
Purpose, but the restoring force of spring fastenings 23 effect under, manhole cover plate A24 is held and is sprung back, and well is and so on caused
The vibration of cover board A24 or more back and forth prevents the impurity in sewage from blocking side permeable hole 25 and top permeable hole 26, accelerates under sewage
Speed is arranged, more preferably, multiple bracket A27 intersect to form network practicability, which is fixed on manhole cover plate A24
Inside, when manhole cover plate A24 stress is larger, the setting of the network increases the bearing capacity of manhole cover plate A24, and in stress
It is larger so that manhole cover plate A24 occur micro-strain when, which can correct the micro-strain of manhole cover plate A24, to keep away
Exempt from because carry it is excessive caused by manhole cover plate A24 structural failure, the bearing capacity of covert increase manhole cover plate A24.
Embodiment two:
Fig. 6-7 is please referred to, it is a kind of to carry the heavy ductile cast iron manhole cover for reaching F900, including lower water assembly B3 and well lid group
Multiple groups Manhole cover assembly B4 is fixedly mounted in top surface on part B4, lower water assembly B3, and lower water assembly B3 includes sewer 31,32 and of strainer
Mounting groove 33, strainer 32 are fixedly mounted on the inside of sewer 31, and the top two sides of sewer 31 process mounting groove 33, installation
Slot 33 is fixedly connected with Manhole cover assembly B4；
Fig. 8-9 is please referred to, Manhole cover assembly B4 includes draw runner 41, manhole cover plate B42, water-carrying groove 43, bracket 44, bracket B45
With connection shaft B46, draw runner 41 engages with mounting groove 33, and draw runner 41 is fixed on the two sides of manhole cover plate B42, the top of manhole cover plate B42
Face equidistantly processes multiple water-carrying grooves 43, the bottom surface mounting bracket 44 of manhole cover plate B42, bottom and the sewer 31 of bracket 44
Bottom surface is in close contact, and the side wall of bracket 44 is fixedly connected with strainer 32, and multiple brackets are fixedly installed in the inner wall of sewer 31
B45, multiple bracket B45 intersect to form network, and the equal movable set of the infall of the network connects shaft
B46, manhole cover plate B42 are set as square plate structure, and the top surface of sewer 31 is spliced two-by-two by manhole cover plate B42 to be covered, well lid
Plate B42, bracket 44 and bracket B45 are all made of ductile cast iron material and are made, the surface of manhole cover plate B42 and the surface of sewer 31
Concordantly.
Working principle: it by the engaging of draw runner 41 and mounting groove 33, realizes the installation of square manhole cover plate B42, passes through muti-piece
The well lid installation of bar shaped drainage ditch is realized in the splicing of manhole cover plate B42, and surface waste water is flowed into sewer 31 by water-carrying groove 43,
The setting of bracket 44 increases the mounting stability of manhole cover plate B42, and latticed bracket B45 is arranged in the inside of manhole cover plate B42,
Deformation of extending caused by manhole cover plate B42 compression is excessive is prevented, increases the bearing capacity of manhole cover plate B42, extends making for manhole cover plate B42
With the service life, practicability is more preferably.
In summary: a kind of carry provided by the invention reaches the heavy ductile cast iron manhole cover of F900, the bottom of manhole cover plate A24
Portion is fixedly connected by spring fastenings 23 with card slot 22, realizes installation and fixation to manhole cover plate A24, increases manhole cover plate A24
Positional stability, reduce stolen possibility, prevent alice and dig, the outer diameter of manhole cover plate A24 is less than installation set 21
Internal diameter, so there are gap between manhole cover plate A24 and the inner wall of installation set 21, surface waste water first flows into the gap, then from
It is flowed into lower flume 11 in side permeable hole 25 and top permeable hole 26, lower flume 11 accesses municipal drainage system, realizes well lid
Drain function, when the inflow of single well lid is less than the displacement of lower flume 11, rapid stream can be by well in lower flume 11
Cover board A24 is jacked up, and achievees the purpose that pressure release, but under the effect of the restoring force of spring fastenings 23, manhole cover plate A24 is held simultaneously
Rebound, and so on leads to the vibration of manhole cover plate A24 or more back and forth, prevents the impurity in sewage from blocking side permeable hole 25 and top thoroughly
Water hole 26 accelerates lower row's speed of sewage, and more preferably, multiple bracket A27 intersect to form network practicability, the grid
Structure is fixed on the inside of manhole cover plate A24, and when manhole cover plate A24 stress is larger, the setting of the network increases manhole cover plate A24
Bearing capacity, and it is larger in stress so that manhole cover plate A24 occur micro-strain when, which can correct manhole cover plate
The micro-strain of A24, thus avoid because carry it is excessive caused by manhole cover plate A24 structural failure, covert increase manhole cover plate A24's
Bearing capacity.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (5)
1. a kind of carry the heavy ductile cast iron manhole cover for reaching F900, including lower water assembly A (1) and Manhole cover assembly A (2), it is lauched
On component A (1) be fixedly mounted multiple groups Manhole cover assembly A (2), it is characterised in that: the lower water assembly A (1) include lower flume (11),
Multiple groups are arranged in intercept net (12) and mounting hole (13), intercept net (12), and multiple groups intercept net (12) is equidistantly fixedly mounted on lower flume
(11) inside, the top surface of lower flume (11) equidistantly process multiple mounting holes (13), and well is fixedly mounted in the inside of mounting hole (13)
Cap assemblies A (2)；
The Manhole cover assembly A (2) includes that installation set (21), card slot (22), spring fastenings (23), manhole cover plate A (24), side are permeable
Hole (25), top permeable hole (26), bracket A (27) and connection shaft A (28), the outer wall of installation set (21) and mounting hole (13) are solid
Fixed connection, the card slot (22) of the inner wall fixed setting annular of installation set (21), the bottom card of card slot (22) and manhole cover plate A (24)
It closes, multiple spring fastenings (23), the side wall of manhole cover plate A (24) is fixedly mounted in the junction of card slot (22) and manhole cover plate A (24)
Multiple groups side permeable hole (25) angularly are processed, the top surface of manhole cover plate A (24) processes multiple top permeable holes (26), bracket A (27)
The equal manhole cover plate A (24) in both ends inner wall on, bracket A (27) setting it is multiple, multiple bracket A (27) intersect to form net
Lattice structure, equal movable set connection shaft A (28) of the infall of the network.
2. the heavy ductile cast iron manhole cover that a kind of carrying as described in claim 1 reaches F900, it is characterised in that: the installation
Set (21) and manhole cover plate A (24) are disposed as circular configuration, and the outer diameter of manhole cover plate A (24) is less than the internal diameter of installation set (21)
Size.
3. the heavy ductile cast iron manhole cover that a kind of carrying as described in claim 1 reaches F900, it is characterised in that: the spring
Connector (23) is fixed on the inside of card slot (22).
4. the heavy ductile cast iron manhole cover that a kind of carrying as described in claim 1 reaches F900, it is characterised in that: the well lid
Plate A (24) and bracket A (27) are all made of ductile cast iron material and are made.
5. the heavy ductile cast iron manhole cover that a kind of carrying as described in claim 1 reaches F900, it is characterised in that: the well lid
The surface of plate A (24) and the flush of lower flume (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910799490.9A CN110512652B (en) | 2019-08-28 | 2019-08-28 | Heavy nodular cast iron well lid capable of bearing F900 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910799490.9A CN110512652B (en) | 2019-08-28 | 2019-08-28 | Heavy nodular cast iron well lid capable of bearing F900 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110512652A true CN110512652A (en) | 2019-11-29 |
| CN110512652B CN110512652B (en) | 2021-04-30 |
Family
ID=68627253
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910799490.9A Active CN110512652B (en) | 2019-08-28 | 2019-08-28 | Heavy nodular cast iron well lid capable of bearing F900 |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110512652B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113718857A (en) * | 2021-09-03 | 2021-11-30 | 湖南东泉铸造有限公司 | Double-hole double-cover nodular cast iron well lid and assembling device thereof |
Citations (7)
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|---|---|---|---|---|
| CN2622254Y (en) * | 2003-05-24 | 2004-06-30 | 戴禄春 | Lifting conjugated theft-proof cover of manhole |
| JP2006077392A (en) * | 2004-09-07 | 2006-03-23 | Tomisu:Kk | Iron-cover connecting structure |
| CN201116371Y (en) * | 2007-10-22 | 2008-09-17 | 杨大学 | Integrated well cover steel skeleton |
| JP2008285845A (en) * | 2007-05-16 | 2008-11-27 | Railway Technical Res Inst | Lid with internal excessive-high pressure release valve |
| CN102852162A (en) * | 2012-08-29 | 2013-01-02 | 中国民航大学 | Water discharging manhole cover capable of automatically hoisting |
| CN106149759A (en) * | 2015-04-08 | 2016-11-23 | 无锡百科知识产权有限公司 | A kind of special corrugated tube of inspection well cover |
| CN109296007A (en) * | 2018-09-12 | 2019-02-01 | 郭俊桦 | A kind of pressure relief device of the spheroidal graphite circle well cover for sewer for waterlogging anticreep |
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2019
- 2019-08-28 CN CN201910799490.9A patent/CN110512652B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2622254Y (en) * | 2003-05-24 | 2004-06-30 | 戴禄春 | Lifting conjugated theft-proof cover of manhole |
| JP2006077392A (en) * | 2004-09-07 | 2006-03-23 | Tomisu:Kk | Iron-cover connecting structure |
| JP2008285845A (en) * | 2007-05-16 | 2008-11-27 | Railway Technical Res Inst | Lid with internal excessive-high pressure release valve |
| CN201116371Y (en) * | 2007-10-22 | 2008-09-17 | 杨大学 | Integrated well cover steel skeleton |
| CN102852162A (en) * | 2012-08-29 | 2013-01-02 | 中国民航大学 | Water discharging manhole cover capable of automatically hoisting |
| CN106149759A (en) * | 2015-04-08 | 2016-11-23 | 无锡百科知识产权有限公司 | A kind of special corrugated tube of inspection well cover |
| CN109296007A (en) * | 2018-09-12 | 2019-02-01 | 郭俊桦 | A kind of pressure relief device of the spheroidal graphite circle well cover for sewer for waterlogging anticreep |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113718857A (en) * | 2021-09-03 | 2021-11-30 | 湖南东泉铸造有限公司 | Double-hole double-cover nodular cast iron well lid and assembling device thereof |
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| Publication number | Publication date |
|---|---|
| CN110512652B (en) | 2021-04-30 |
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