CN116411591A - Well lid of adjustable horizontality - Google Patents

Well lid of adjustable horizontality Download PDF

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Publication number
CN116411591A
CN116411591A CN202310400314.XA CN202310400314A CN116411591A CN 116411591 A CN116411591 A CN 116411591A CN 202310400314 A CN202310400314 A CN 202310400314A CN 116411591 A CN116411591 A CN 116411591A
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CN
China
Prior art keywords
base
stud
well lid
sliding
lid body
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.)
Granted
Application number
CN202310400314.XA
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Chinese (zh)
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CN116411591B (en
Inventor
章俊
翁宜宁
李迦楠
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.)
Yong Jin Municipal Facilities Co ltd
Original Assignee
Yong Jin Municipal Facilities Co ltd
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Application filed by Yong Jin Municipal Facilities Co ltd filed Critical Yong Jin Municipal Facilities Co ltd
Priority to CN202310400314.XA priority Critical patent/CN116411591B/en
Publication of CN116411591A publication Critical patent/CN116411591A/en
Application granted granted Critical
Publication of CN116411591B publication Critical patent/CN116411591B/en
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D29/00Independent underground or underwater structures; Retaining walls
    • E02D29/12Manhole shafts; Other inspection or access chambers; Accessories therefor
    • E02D29/14Covers for manholes or the like; Frames for covers
    • E02D29/1409Covers for manholes or the like; Frames for covers adjustable in height or inclination
    • 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

Abstract

The invention discloses a well lid with an adjustable horizontal state, which comprises a well lid body and a base, wherein the base is used for being installed at a well head, and the top of the base is provided with an installation groove for installing the well lid body; the base is provided with three at least high adjustment mechanism along circumference, and the base is provided with a plurality of through-holes that are used for the slip casting, and high adjustment mechanism includes: the first stud is rotationally connected to the base, a first limiting piece for limiting the axial sliding of the first stud is arranged on the first stud, and the top of the first stud extends to the surface of the base; the second stud is connected to the base in a sliding manner, the top of the second stud is in threaded fit with the bottom of the first stud, a second limiting piece for limiting the second stud to rotate circumferentially is arranged on the second stud, and the bottom of the second stud extends to the lower portion of the base; and the gasket is arranged below the base, and the top of the gasket is propped against the bottom of the second stud. The invention can realize horizontal adjustment by directly operating outside the well cover, is convenient and quick, and is convenient to maintain and adjust in the later period.

Description

Well lid of adjustable horizontality
Technical Field
The invention relates to municipal supporting equipment, in particular to a well lid with an adjustable horizontal state.
Background
In urban construction, there are many underground pipelines, such as sewer, underground gas pipeline, tap water pipeline, electric pipeline, communication pipeline, national defense pipeline, etc., and every other section of these pipelines has an outlet to ground, in order to avoid that the outlet affects the normal traffic of pedestrians and vehicles, a well cover is installed at the outlet.
In the long-time use process of the well cover, the well cover can be settled under the action of pedestrians and vehicles. Therefore, how to adjust the secondary horizontal state of the well lid under the condition of well lid sedimentation is a problem to be solved by the well lid industry in the past. The invention patent with publication number of CN114411815A discloses a height-adjustable well lid, which realizes that the height of a well lid body is flush with a road surface by vertically arranging a plurality of adjusting channels and adjusting the height of an internal adjusting column through a wedge-shaped block at the bottom.
In the scheme, in the implementation process, the wedge-shaped block for adjustment is positioned at the bottom, so that in the implementation process, the well cover is required to be opened first, and a worker stretches hands into the inside to realize adjustment, so that great inconvenience is brought to the adjustment. Based on this, how to design a well lid that can be horizontally adjusted on the ground is one of the difficulties to be solved.
Disclosure of Invention
In order to solve at least one technical problem mentioned in the background art, the invention aims to provide the well lid with the adjustable horizontal state, which can be directly operated outside the well lid to realize horizontal adjustment, is convenient and quick, and is convenient to maintain and adjust in the later period.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the well lid comprises a well lid body and a base, wherein the base is used for being installed at a well mouth, and an installation groove for installing the well lid body is formed in the top of the base; the base is provided with at least three high adjustment mechanism along circumference, the base be provided with a plurality of through-holes that are used for the slip casting, high adjustment mechanism includes:
the first stud is rotationally connected to the base, a first limiting piece for limiting the axial sliding of the first stud is arranged on the first stud, and the top of the first stud extends to the surface of the base;
the second stud is connected to the base in a sliding manner, the top of the second stud is in threaded fit with the bottom of the first stud, a second limiting piece for limiting the second stud to rotate circumferentially is arranged on the second stud, and the bottom of the second stud extends to the lower portion of the base;
and the gasket is arranged below the base, and the top of the gasket is propped against the bottom of the second stud.
In some embodiments of the invention, the first stop comprises a butterfly tab circumferentially disposed on an outer wall of the first stud.
In some embodiments of the invention, the second stop comprises a plate axially disposed on an outer wall of the second stud.
In some embodiments of the invention, the top of the washer and/or the bottom of the second stud is a cambered surface.
In some embodiments of the invention, an anti-falling mechanism is arranged between the well lid body and the base, and the anti-falling mechanism comprises a first limiting block arranged on the inner wall of the base and a second limiting block arranged at the bottom of the well lid body; along with the rotation of well lid body, the second stopper moves along circumference, and when the second stopper moved to the position that overlaps in the vertical direction with first stopper, well lid body and base lock in the vertical direction.
In some embodiments of the invention, a movable connection mechanism is arranged between the well lid body and the base, and the movable connection mechanism comprises a first connection groove arranged on the base in a longitudinal direction, a second connection groove arranged on the well lid body and a connecting piece; one end of the connecting piece is in sliding connection with the first connecting groove, and the other end of the connecting piece is in rotary connection or sliding connection with the second connecting groove.
In some embodiments of the present invention, the base is provided with a sliding component, the sliding component includes a sliding rail and a sliding block, the sliding rail is circumferentially arranged on an inner wall of the base, the sliding block is in sliding fit with the sliding rail, and the first connecting groove is arranged on the sliding block.
In some embodiments of the invention, a handle is arranged at the top of the well cover body at a position opposite to the second connecting groove.
In certain embodiments of the invention, the handle is formed by a lower annular groove.
In some embodiments of the invention, a protective cover is provided on the outside of the height adjustment mechanism.
In some embodiments of the invention, the shield is an open-top pouch that encloses the gasket and the bottom of the second stud, the opening of the pouch being connected to the lower surface of the base.
In certain embodiments of the present invention, the shield is made of PVC plastic.
The horizontal well lid installing process includes the following steps:
s1, tamping and flattening the bottom surface around the wellhead;
s2, installing the height adjusting mechanism on the base;
s3, placing the base and the height adjusting mechanism at a wellhead together;
s4, screwing and sequentially screwing the first studs to enable the edge of the base to be kept at the same height with the road surface;
s5, filling the through holes with the slurry.
And (5) completing the horizontal installation of the well lid after the slurry is solidified.
In certain embodiments of the present invention, in step S2, a protective cover is also provided on the outside of the height adjustment mechanism.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the base is adjusted in the vertical direction by matching the two studs, a worker is not required to operate hands or even the inside of the base, the installation process is convenient and quick, and a large amount of manpower and material resources can be saved in the later maintenance process.
Drawings
Fig. 1 is a perspective view of an embodiment of the present invention.
Fig. 2 is an exploded view of a manhole cover according to an embodiment of the invention.
Fig. 3 is a top view of an embodiment of the present invention.
Fig. 4 is a cross-sectional view A-A of fig. 3.
Fig. 5 is a partial enlarged view of fig. 4 at C.
FIG. 6 is a schematic view of a height adjustment mechanism according to an embodiment of the present invention.
Fig. 7 is a partial schematic view of the tilting state of the present invention.
FIG. 8 is a partial schematic view of the present invention readjusted to horizontal.
Fig. 9 is a sectional view D-D of fig. 5.
Fig. 10 is a partial schematic view of a height adjustment mechanism of another embodiment.
Fig. 11 is a schematic view of a base structure according to an embodiment of the invention.
Fig. 12 is a schematic view of the bottom of the manhole cover body according to an embodiment of the invention.
Fig. 13 is a schematic structural view of a connector according to an embodiment of the invention.
Fig. 14 is a B-B cross-sectional view of fig. 3.
Fig. 15 is a schematic view of the open state of the manhole cover body according to the present invention.
Fig. 16 is a schematic view of the engagement of the anti-disengaging mechanism of the present invention.
Fig. 17 is a partial enlarged view at E of fig. 16.
In the figure:
1. a base; 11. a mounting groove; 12. a through hole;
2. a manhole cover body; 21. a handle;
3. a height adjusting mechanism; 31. a first stud; 311. a first limiting member; 32. a second stud; 321. a second limiting piece; 33. a gasket; 34. a protective cover;
4. an anti-drop mechanism; 41. a first limiting block; 42. a second limiting block;
5. a movable connecting mechanism; 51. a first connection groove; 52. a second connecting groove; 53. a connecting piece;
6. a sliding assembly; 61. a slide rail; 62. a sliding block.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Embodiment one:
referring to fig. 1 to 3, the present embodiment provides a manhole cover with an adjustable horizontal state, which includes a base 1 and a manhole cover body 2, wherein the base 1 is used for being installed at a wellhead, and an installation groove 11 for installing the manhole cover body 2 is provided at the top of the base 1.
In order to realize the horizontal arrangement of the whole manhole cover, as shown in fig. 3, the base 1 is provided with at least three height adjusting mechanisms 3 along the circumferential direction. Local height adjustment is achieved through the height adjusting mechanism 3, and the four height adjusting mechanisms 3 are adopted in the implementation, so that the whole well lid is kept stable in a horizontal state. On this basis, the base 1 is provided with a plurality of through holes 12 for grouting, when all height adjusting mechanisms adjust to the well lid and keep horizontal position, the through holes 12 are filled with slurry, and after the slurry is solidified, the horizontal state of the well lid can be stably kept.
As shown in figures 4, 5 and 6, the height adjusting mechanism 3 includes:
the first stud 31 is rotatably connected to the base 1, a first limiting piece 311 for limiting the first stud 31 to axially slide is arranged on the first stud 31, the top of the first stud 31 extends to the surface of the base 1, and a clamping groove is formed in the top of the first stud 31, so that tools such as a screwdriver can conveniently extend into the first stud to realize screwing. As shown in fig. 6, the first limiting member 311 includes a butterfly-shaped piece circumferentially disposed on an outer wall of the first stud 31. Correspondingly, the base 1 is provided with a corresponding groove body. It should be noted that, in order to implement the installation of the first limiting member 311, a part of the base 1 may be designed as a separate structure.
The second stud 32 is slidably connected to the base 1, the top of the second stud 32 is in threaded fit with the bottom of the first stud 31, a second limiting part 321 for limiting the second stud 32 to rotate circumferentially is arranged on the second stud 32, and the bottom of the second stud 32 extends to the lower portion of the base 1. As shown in fig. 6 and 9, the second limiting member 321 includes a flat plate disposed on an outer wall of the second stud 32 along an axial direction. Correspondingly, the base 1 is also provided with a corresponding groove body. Because the second limiting piece is limited by the circumference, when the first stud 31 is screwed, the second stud 32 realizes axial sliding due to the threaded fit of the first stud 31 and the second stud 32.
A spacer 33 for mounting under the base 1, the top of the spacer 33 abutting against the bottom of the second stud 32. When installed, the spacer is in contact with the bottom surface at the wellhead, so that a partial vertical height adjustment of the base 1 can be achieved by sliding the second stud 32. Through the height adjustment in a plurality of positions, finally realize the holistic horizontality of well lid, then pour into thick liquids to full in the through-hole 12, after the thick liquids solidify, just can stably keep the horizontality of well lid.
As shown in fig. 6, the abutment between the second stud 32 and the spacer 33 is stabilized, and the top of the spacer 33 and/or the bottom of the second stud 32 are/is cambered.
As shown in fig. 7, in the case where the inclination occurs during the installation process or after the use, the inclination of the base 1 and the spacer 33 may occur. In this state, the adjustment is performed externally, and the adjustment of the lower spacer 33 is not performed, and only the entire base 1 can be adjusted to the horizontal state as shown in fig. 8. As is evident from a comparison of fig. 7 and 8, the second stud 32 will slip horizontally with respect to the spacer 33, and the direction of this horizontal slip is not controlled by the direction of inclination of the base. This is also the root cause of the present embodiment when designed to use the second stud 32 and washer 33 in abutment. If the second stud 32 and the spacer 33 are fixedly connected, the spacer 33 is limited by the slurry solidified in the spacer 33 during the adjustment process, and the adjustment cannot be performed, and the height adjustment mechanism 3 may be damaged partially.
In another embodiment, in order to avoid that the slurry flows around the second stud 32 and the spacer 33 along the top of the spacer 33 before setting, the latter adjustment is affected, on the other hand, also in order to achieve the height adjustment mechanism 3. As shown in fig. 10, the present invention is provided with a protection cover 34 on the outer side of the height adjusting mechanism 3. Preferably, the protective cover 34 is a bag body with an open top, the bag body wraps the gasket 33 and the bottom of the second stud 32, the opening of the bag body is connected to the lower surface of the base 1, and an installation groove matched with the opening of the bag body is formed in the bottom of the base 1 so that the opening is clamped in to realize installation; the shield is preferably made of PVC plastic, having a certain flexibility to accommodate stretching of the base 1 during local height adjustment of the base 1.
In order to prevent the manhole cover body 2 from being detached from the base 1 during use. As shown in fig. 2 and 16, an anti-falling mechanism 4 is disposed between the manhole cover body 2 and the base 1, and the anti-falling mechanism 4 includes a first limiting block 41 disposed on an inner wall of the base 1 and a second limiting block 42 disposed at a bottom of the manhole cover body 2. As shown in fig. 11, the first limiting block 41 is specifically a fixed block with a concave middle position; as shown in fig. 12, the second limiting block 42 is specifically a fixing block with a convex middle part, the convex shape is adapted to the concave shape of the first limiting block 41, and the second limiting block 42 is fixed at the bottom of the manhole cover body 2 through an arc-shaped connecting plate.
As shown in fig. 17, the second stopper 42 moves synchronously in the circumferential direction with the rotation of the manhole cover body 2. When the second stopper 42 moves to a position overlapping the first stopper 41 in the vertical direction, the manhole cover body 2 and the base 1 are locked in the vertical direction, and the manhole cover body 2 cannot be taken out. In another state, when the second limiting block 42' moves to a position separated from the first limiting block 41 in the vertical direction, the well lid body 2 and the base 1 are unlocked in the vertical direction, and the well lid body 2 can be easily taken out.
In the above scheme, the well lid body 2 can be easily moved by unlocking, so that in certain extreme weather, if the well lid body 2 is continuously flushed by water in the well, the rotation of the well lid body 2 is possibly caused, and the unlocking is caused. And with the flushing of heavy rain, the well lid body 2 may be flushed away. In order to avoid this, as shown in fig. 2 and 14, a movable connection mechanism 5 is disposed between the manhole cover body 2 and the base 1. The movable connecting mechanism 5 comprises a first connecting groove 51 which is arranged on the base 1 and longitudinally arranged, a second connecting groove 52 which is arranged on the well cover body 2, and a connecting piece 53. One end of the connecting piece 53 is slidably connected to the first connecting groove 51, and the other end is rotatably connected or slidably connected to the second connecting groove 52. As shown in fig. 13, the connecting members 53 are provided at both ends thereof with connecting shafts for realizing a rotational or sliding connection, respectively. As shown in fig. 12, the second connecting groove 52 is formed by surrounding two L-shaped plates, one end of which is closed and the other end of which is open. When the connecting piece 53 is installed, one end of the connecting piece 53 is placed into the second connecting groove 52 along the opening, and the opening is closed by screwing the bolt into the opening, so that the connecting piece 53 and the second connecting groove 52 are connected, and the connecting piece 53 and the second connecting groove 52 are not easy to separate. Even in the unlocked state of the anti-release mechanism 4, the manhole cover body 2 can be locked near the base 1 by the action of the connector 53.
When the well lid body 1 needs to be opened, only the well lid body 1 needs to be lifted up vertically to the state of fig. 15, and then the well lid body 2 is rotated along the arrow of the connection part of the second connecting groove 52, so that the well lid body 2 can be opened. In order to facilitate lifting of the manhole cover body 1, as shown in fig. 3 and 14, a handle 21 formed by a lower annular groove is disposed at a position opposite to the second connecting groove 52 at the top of the manhole cover body 2.
In the above embodiment, the self-locking mechanism 4 and the movable connecting mechanism 5 are mutually formed, so that the opening of the manhole cover body is difficult. Based on this, the invention further improves the articulating mechanism 5. As shown in fig. 2 and 11, the base 1 is provided with a sliding assembly 6, the sliding assembly 6 includes a sliding rail 61 disposed on an inner wall of the base 1 along a circumferential direction and a sliding block 62 slidably engaged with the sliding rail 61, and the first connecting grooves 52 are disposed on the sliding block 62. Through the above setting, at the in-process of anticreep mechanism 4 unblock, well lid body 2 can drive slider 62 synchronous motion to avoid anticreep mechanism 4 and swing joint mechanism 5 to take place mutual interference. It should be noted that, in order to avoid the sliding block 62 from separating from the sliding rail 61, two ends of the sliding rail 61 are provided with anti-falling portions, the anti-falling portions may be specifically bumps, the section of which is larger than that of the sliding rail, and the bumps on at least one side are detachably connected with the sliding rail 61.
Embodiment two:
the embodiment provides a horizontal installation method of a well lid, which comprises the following steps:
s1, tamping and flattening the bottom surface around the wellhead;
s2, installing the height adjusting mechanism in the first embodiment on a base;
s3, placing the base and the height adjusting mechanism at a wellhead together;
s4, screwing and sequentially screwing the first studs to enable the edge of the base to be kept at the same height with the road surface;
s5, filling the through holes with the slurry.
And (5) after the slurry is solidified, the well lid is installed.
In certain embodiments of the present invention, in step S2, a protective cover is also provided on the outside of the height adjustment mechanism.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims (10)

1. The well lid comprises a well lid body and a base, wherein the base is used for being installed at a well mouth, and an installation groove for installing the well lid body is formed in the top of the base; the utility model provides a high adjustment mechanism of at least three, the through-hole that is used for the slip casting is provided with to the base along circumference to its characterized in that, the base, high adjustment mechanism includes:
the first stud is rotationally connected to the base, a first limiting piece for limiting the axial sliding of the first stud is arranged on the first stud, and the top of the first stud extends to the surface of the base;
the second stud is connected to the base in a sliding manner, the top of the second stud is in threaded fit with the bottom of the first stud, a second limiting piece for limiting the second stud to rotate circumferentially is arranged on the second stud, and the bottom of the second stud extends to the lower portion of the base;
and the gasket is arranged below the base, and the top of the gasket is propped against the bottom of the second stud.
2. The well lid of claim 1, wherein the first stop comprises a butterfly tab circumferentially disposed on an outer wall of the first stud.
3. The well lid of claim 1 or 2, wherein the second limiting member comprises a plate axially disposed on an outer wall of the second stud.
4. The well lid of claim 1, wherein the top of the spacer and/or the bottom of the second stud is a cambered surface.
5. The well lid with the adjustable horizontal state according to claim 1, wherein an anti-falling mechanism is arranged between the well lid body and the base, and the anti-falling mechanism comprises a first limiting block arranged on the inner wall of the base and a second limiting block arranged at the bottom of the well lid body; along with the rotation of well lid body, the second stopper moves along circumference, and when the second stopper moved to the position that overlaps in the vertical direction with first stopper, well lid body and base lock in the vertical direction.
6. The well lid with the adjustable horizontal state according to claim 1 or 5, wherein a movable connecting mechanism is arranged between the well lid body and the base, and comprises a first connecting groove arranged on the base in a longitudinal direction, a second connecting groove arranged on the well lid body and a connecting piece; one end of the connecting piece is in sliding connection with the first connecting groove, and the other end of the connecting piece is in rotary connection or sliding connection with the second connecting groove.
7. The well lid with the adjustable horizontal state according to claim 6, wherein the base is provided with a sliding assembly, the sliding assembly comprises a sliding rail and a sliding block, the sliding rail is circumferentially arranged on the inner wall of the base, the sliding block is in sliding fit with the sliding rail, and the first connecting groove is formed in the sliding block.
8. The well lid of claim 6, wherein the top of the well lid body is provided with a handle at a position opposite to the second connecting groove.
9. The adjustable level manhole cover of claim 8, wherein the handle is formed from a lower annular groove.
10. The well lid of claim 1, wherein a protective cover is provided on the outside of the height adjustment mechanism.
CN202310400314.XA 2023-04-14 2023-04-14 Well lid of adjustable horizontality Active CN116411591B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310400314.XA CN116411591B (en) 2023-04-14 2023-04-14 Well lid of adjustable horizontality

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Application Number Priority Date Filing Date Title
CN202310400314.XA CN116411591B (en) 2023-04-14 2023-04-14 Well lid of adjustable horizontality

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CN116411591A true CN116411591A (en) 2023-07-11
CN116411591B CN116411591B (en) 2023-09-12

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2445721A1 (en) * 1974-09-25 1976-04-08 Winfried Rathgeber Manhole cover with adjustable height - has split frame with bolts for lifting cover level with road surface
DE3441786A1 (en) * 1984-03-31 1985-10-10 Wilhelm 7971 Aichstetten Wiedenmann Manhole cover for street manholes
CN1163962A (en) * 1996-03-26 1997-11-05 阎乃京 Potential difference type self-lock manhole cover device
KR100604449B1 (en) * 2006-04-13 2006-07-28 주식회사 한국종합기술 A water supply and drainage manhole to be able to regulating the height of it
CN205875220U (en) * 2016-06-30 2017-01-11 福州万润建材有限公司 Inspection well cover
CN207646760U (en) * 2017-09-28 2018-07-24 胡娅婷 A kind of anti-stealing manhole cover
CN211057863U (en) * 2019-11-04 2020-07-21 傅卫江 Municipal administration prevents subsiding well lid
CN307237335S (en) * 2022-04-05

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN307237335S (en) * 2022-04-05
DE2445721A1 (en) * 1974-09-25 1976-04-08 Winfried Rathgeber Manhole cover with adjustable height - has split frame with bolts for lifting cover level with road surface
DE3441786A1 (en) * 1984-03-31 1985-10-10 Wilhelm 7971 Aichstetten Wiedenmann Manhole cover for street manholes
CN1163962A (en) * 1996-03-26 1997-11-05 阎乃京 Potential difference type self-lock manhole cover device
KR100604449B1 (en) * 2006-04-13 2006-07-28 주식회사 한국종합기술 A water supply and drainage manhole to be able to regulating the height of it
CN205875220U (en) * 2016-06-30 2017-01-11 福州万润建材有限公司 Inspection well cover
CN207646760U (en) * 2017-09-28 2018-07-24 胡娅婷 A kind of anti-stealing manhole cover
CN211057863U (en) * 2019-11-04 2020-07-21 傅卫江 Municipal administration prevents subsiding well lid

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Inventor after: Zhang Jun

Inventor after: Weng Yining

Inventor after: Li Jianan

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Inventor before: Weng Yining

Inventor before: Li Jianan