EP0985770A1 - Manhole assembly for covering a well - Google Patents
Manhole assembly for covering a well Download PDFInfo
- Publication number
- EP0985770A1 EP0985770A1 EP98116949A EP98116949A EP0985770A1 EP 0985770 A1 EP0985770 A1 EP 0985770A1 EP 98116949 A EP98116949 A EP 98116949A EP 98116949 A EP98116949 A EP 98116949A EP 0985770 A1 EP0985770 A1 EP 0985770A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cover
- assembly according
- closed position
- hinge device
- manhole assembly
- 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- Withdrawn
Links
Images
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
- E02D29/1463—Hinged connection of cover to frame
-
- 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
- E02D29/149—Annular gaskets
Definitions
- the present invention relates to a manhole cover for covering a well, comprising a cover, a frame and hinge device allowing the cover to swing between an open and closed position, and to a method of controlling said movement.
- a manhole cover for covering a well of the above-mentioned type, which has a cover that can be locked in the closed position by locking means.
- the lid comprises an opening for introducing a jumper bar with which the locking means interact.
- the locking means are adapted to give way under the action, when a person attempts to open the cover with a special tool, i.e. a crowbar.
- the locking means give way to forces acting on the bottom of the cover and due to the pre-tensioned locking means, the cover will burst open when the locking means give way. Forces urging the cover to open are e.g.
- the cover is allowed to open gradually under the influence of a force or pressure from under the cover and will close by itself, when the pressure or force is not acting any longer on the cover, without the risk of the cover detaching itself from the frame.
- the manhole assembly shown in Figures 1 and 2 comprises a frame 3 with a receiving face for the cover 1 in the form of a flange 4.
- the cover 1 On its underside, the cover 1 is provided with a gasket 6 that will come into sealing contact with the flange 4, when the cover is in the closed position.
- the cover 1 On its underside, the cover 1 may be provided with stiffening ribs and the cover 1 may be provided with a hole for receiving a bar to open the cover 1.
- the cover 1 is connected to the frame 3 by a hinge device 2.
- the cover 1 can swing from a horizontal closed position to a more or less vertical open position and vice versa.
- the hinge device 2 comprises a pin 7 and pin hole 8, whereby the pin holes 8 are provided in lugs 9 that are connected and extend from the cover.
- the pin 7 can be fixed to the frame directly, or the frame 3 may also be provided with ribs or lugs which have pin holes 8 for receiving the pin 7.
- the pin and pin hole arrangement of the hinge device 2 can form a double-leaf hinge or a T-hinge or any other suitable type of hinge as easily conceived by a person skilled in the art.
- the hinge device 2 with the pin 7 and pin hole 8 arrangement provides for exact guidance of the swinging movement of the cover 1 between its open and closed position. Moreover, it secures the cover 1 non-detachably to the frame 8.
- the cover 1 When a force acting on the cover opens the cover 1, e.g. when the water level under the well cover increases and forces the cover 1 to open, the cover 1 will function as a relief valve and gradually open until the water level sinks and the pressure ceases to act on the cover whereby it will automatically fall back into its closed position.
- the cover 1 is "connected non-detachably" to the frame 3 which means that the cover 1 cannot detach itself in the normal swinging movement between the open and closed position.
- the user of the manhole can remove the cover 1, if necessary, e.g. by removing the pin 7.
- the pin holes 8 of the hinge device 2 may according to a preferred embodiment be provided with slits 11 opening to the periphery of the lug 9 extending laterally from the cover 1, in which the pin holes are located. These slits 11 are, as can be seen from Figure 5, placed such that only in the fully open position where the cover 1 comes to a rest, the user can pull the cover 1 out of the connection with the frame 3.
- the hinge device 2 is encapsulated and is filled with a lubricant in order to protect it from environmental influences.
- the manhole assembly may be provided with a latch 5 to secure the cover 1 in the open position.
- the latch 5 is connected freely swinging to the cover and extends downwards from the cover 1 from a pivot 10. In the fully open position or substantially fully open position, the latch 5 rests on the flange 4, preferably in a recess, in order to secure the cover in the closed position. By swinging the latch 5 upwards against the gravity force, a user can release the cover 1 and move it into the closed position.
- the cover may be aggrevated in particular in an area diametrically opposite to the hinge, and/or the cover may be secured with a resilient means (not shown) urging the cover into the closed position.
- the cover is secured in the closed position solely by the gravity force.
- This securing by the gravity force only has the advantage that the cover cannot burst open upon a pressure exercised on it.
- the commonly used securing means such as jumpers, latches or hooks cause an initial force to be overcome, whereafter the cover will open abruptly.
- the cover By allowing the cover to open under pressures from under the cover, the cover functions as a relief valve for the pressure that can build up under it.
- the gradual opening of the cover 1 will not pose a serious hazard and the opening might be so small that vehicles can still pass over the cover thereby pushing the lid down for a short time so that the main function of the cover, i.e. to secure a well-hole, is always provided.
Landscapes
- 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
Description
- The present invention relates to a manhole cover for covering a well, comprising a cover, a frame and hinge device allowing the cover to swing between an open and closed position, and to a method of controlling said movement.
- From EP-A-0,533,533 there is known a manhole cover for covering a well of the above-mentioned type, which has a cover that can be locked in the closed position by locking means. For this purpose the lid comprises an opening for introducing a jumper bar with which the locking means interact. The locking means are adapted to give way under the action, when a person attempts to open the cover with a special tool, i.e. a crowbar. In practice, however, the locking means give way to forces acting on the bottom of the cover and due to the pre-tensioned locking means, the cover will burst open when the locking means give way. Forces urging the cover to open are e.g. created when the water level of the well increases due to heavy rain falls in a short period of time and the water level in the canalisation rises quickly, thereby urging the cover to burst open. When the cover bursts open, it can cause damage to nearby vehicles or persons and the cover itself may also be damaged by the enegy that is set free. Moreover, because the known cover is detachable from the frame, since the hinge device does not connect the cover to the frame, the cover is likely to separate itself from the frame. The hole over the well is thereafter not covered any longer and presents a potential hazard to traffic, such as pedestrians and all kinds of vehicles.
- It is the object of the present invention to provide an assembly for covering a well of the kind referred to above, with which it is possible to allow the cover to open upon forces acting on the bottom of the cover without the disadvantages as described above, and this object is achieved with a cover of said kind, which according to the present invention also comprises the features set forth in the characterizing clause of
claim 1. With this arrangement, the cover is allowed to open gradually under the influence of a force or pressure from under the cover and will close by itself, when the pressure or force is not acting any longer on the cover, without the risk of the cover detaching itself from the frame. - In the following detailed part of the present description, the invention will be described in more detail with reference to the exemplary embodiments of a Manhole assembly according to the invention shown in the drawings, in which
- Figure 1 shows a vertical section through a manhole assembly according to the invention, with the cover placed in the closed position,
- Figure 2 shows the manhole frame assembly in a view from above,
- Figure 3 shows a detail of the hinge device and the latch with the cover in the closed position,
- Figure 4 shows the same view as Figure 3, but with the cover in the open position, and
- Figure 5 shows a detail of a preferred embodiment of the hinge device.
-
- The manhole assembly shown in Figures 1 and 2 comprises a
frame 3 with a receiving face for thecover 1 in the form of aflange 4. On its underside, thecover 1 is provided with agasket 6 that will come into sealing contact with theflange 4, when the cover is in the closed position. On its underside, thecover 1 may be provided with stiffening ribs and thecover 1 may be provided with a hole for receiving a bar to open thecover 1. Thecover 1 is connected to theframe 3 by ahinge device 2. Thecover 1 can swing from a horizontal closed position to a more or less vertical open position and vice versa. Thehinge device 2 comprises apin 7 and pin hole 8, whereby the pin holes 8 are provided inlugs 9 that are connected and extend from the cover. Thepin 7 can be fixed to the frame directly, or theframe 3 may also be provided with ribs or lugs which have pin holes 8 for receiving thepin 7. The pin and pin hole arrangement of thehinge device 2 can form a double-leaf hinge or a T-hinge or any other suitable type of hinge as easily conceived by a person skilled in the art. Thehinge device 2 with thepin 7 and pin hole 8 arrangement provides for exact guidance of the swinging movement of thecover 1 between its open and closed position. Moreover, it secures thecover 1 non-detachably to the frame 8. - When a force acting on the cover opens the
cover 1, e.g. when the water level under the well cover increases and forces thecover 1 to open, thecover 1 will function as a relief valve and gradually open until the water level sinks and the pressure ceases to act on the cover whereby it will automatically fall back into its closed position. - The
cover 1 is "connected non-detachably" to theframe 3 which means that thecover 1 cannot detach itself in the normal swinging movement between the open and closed position. The user of the manhole can remove thecover 1, if necessary, e.g. by removing thepin 7. The pin holes 8 of thehinge device 2 may according to a preferred embodiment be provided withslits 11 opening to the periphery of thelug 9 extending laterally from thecover 1, in which the pin holes are located. Theseslits 11 are, as can be seen from Figure 5, placed such that only in the fully open position where thecover 1 comes to a rest, the user can pull thecover 1 out of the connection with theframe 3. - According to a preferred embodiment, the
hinge device 2 is encapsulated and is filled with a lubricant in order to protect it from environmental influences. - According to another preferred embodiment, the manhole assembly may be provided with a
latch 5 to secure thecover 1 in the open position. Thelatch 5 is connected freely swinging to the cover and extends downwards from thecover 1 from apivot 10. In the fully open position or substantially fully open position, thelatch 5 rests on theflange 4, preferably in a recess, in order to secure the cover in the closed position. By swinging thelatch 5 upwards against the gravity force, a user can release thecover 1 and move it into the closed position. - In order to make sure that the
cover 1 does not open upon influences like heavy vehicles driving over the cover, the cover may be aggrevated in particular in an area diametrically opposite to the hinge, and/or the cover may be secured with a resilient means (not shown) urging the cover into the closed position. - According to another preferred embodiment, the cover is secured in the closed position solely by the gravity force. This securing by the gravity force only has the advantage that the cover cannot burst open upon a pressure exercised on it. The commonly used securing means such as jumpers, latches or hooks cause an initial force to be overcome, whereafter the cover will open abruptly.
- By allowing the cover to open under pressures from under the cover, the cover functions as a relief valve for the pressure that can build up under it. The gradual opening of the
cover 1 will not pose a serious hazard and the opening might be so small that vehicles can still pass over the cover thereby pushing the lid down for a short time so that the main function of the cover, i.e. to secure a well-hole, is always provided. -
- 1
- cover
- 2
- hinge device
- 3
- frame
- 4
- flange
- 5
- latch
- 6
- gasket
- 7
- pin
- 8
- pinhole
- 9
- lug
- 10
- pivot
- 11
- slit
Claims (17)
- Manhole assembly for covering a well, comprising a cover (1), a frame (3) and a hinge device (2) allowing the cover (1) to swing between an open position and a closed position,
characterised in that the cover (1) is in a non-detachable connection to the frame (3) through the hinge device (2), whereby the hinge device (2) controls the swinging movement of the cover (1) between the open position and the closed position accurately so that the cover (1) will fall correctly into a secure closed position by itself. - Manhole assembly according to claim 1, characterised in that the hinge device (2) comprises a pin and pin-hole assembly.
- Manhole assembly according to claim 2, characterised in that the hinge device (2) comprises at least one lug (9) connected to the cover (1) and extending substantially lateral therefrom, said lug (9) being provided with a pin-hole (8) through which the pin (7) extends.
- Manhole assembly according to claim 3, characterised in that at least one rib or lug (9) is extending from the frame (3), whereby the hinge device (2) forms a double-leaf hinge or a T-hinge.
- Manhole assembly according to claim 3 or 4, characterised in that the pin-hole (8) on the at least one lug (9) extending from the cover (1) is provided with a slit (11) opening to the periphery of the at least one lug (9).
- Manhole assembly according to any of the claims 1-5, characterised in that the pivot axis defined by the hinge device (1) is located at the frame (3) or adjacent to the frame (3).
- Manhole assembly according to any of the claims 1 to 6, characterised in that the hinge device (2) is at least partially encapsulated in the flange (3) in order to protect it from environmental influences.
- Manhole assembly according to claim 7, characterised in that the encapsulated space is filled with a lubricant.
- Manhole assembly according to any of the claims 1 to 8, characterised in that the frame (3) comprises a flange (4) for the cover (1) to rest on in the closed position.
- Manhole assembly according to any of the claims 1 to 9, characterised in that a free swinging latch (10) is connected to the cover (1), the latch (10) securing the cover (1) in the open position.
- Manhole assembly according to claim 10, characterised in that the latch (10) rests on the flange (4) in order to secure the cover (1) in the closed position.
- Manhole assembly according to any of the claims 1 to 11, characterised in that the assembly is of circular shape.
- Manhole assembly according to any of the claims 1 to 12, characterised in that the cover (1) is aggravated, in particular in the area diametrically opposite to the hinge device (2).
- Manhole assembly according to any of the claims 1-13, characterised in that the assembly is provided with resilient means that urge the cover (1) into the closed position.
- Manhole assembly according to any of the claims 1-13, characterised in that the cover (1) is secured in the closed position solely by the gravity force.
- Manhole assembly according to any of the claims 1 to 15, characterised by comprising a gasket (6) attached to the cover (1), said gasket (6) being in sealing contact with the flange (4) when the cover (1) is in the closed position.
- Method of controlling the opening of a cover of a manhole for covering a well comprising the steps of providing a cover (1), providing a frame (3) and providing a hinge device (2) allowing the cover to swing between an open position and a closed position,
characterised by the hinge device (2) connecting the cover (1) non-detachably to the frame (3) and the hinge device (2) providing exact guidance for the movement of the cover (1) between the open position and the closed position so that the cover (1) will fall correctly into a secure closed position by itself, secured by the gravity force, and by the step of allowing the cover to open gradually upon forces acting on the bottom of the cover generated by fluid coming up from the well and thereby relieving fluid coming up from the well.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98116949A EP0985770A1 (en) | 1998-09-08 | 1998-09-08 | Manhole assembly for covering a well |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98116949A EP0985770A1 (en) | 1998-09-08 | 1998-09-08 | Manhole assembly for covering a well |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0985770A1 true EP0985770A1 (en) | 2000-03-15 |
Family
ID=8232593
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98116949A Withdrawn EP0985770A1 (en) | 1998-09-08 | 1998-09-08 | Manhole assembly for covering a well |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP0985770A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1243705A1 (en) * | 2001-03-23 | 2002-09-25 | Societe De Transformation Industrielle De Materiels Orthopediques, Medicaux Plastiques Sigle "Trioplast" | Safety cover for closing openings at waste water purification plants |
CN102888857A (en) * | 2012-10-23 | 2013-01-23 | 四川省电力公司西昌电业局 | Pressure-tolerant well cover |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2163467A (en) * | 1984-07-13 | 1986-02-26 | Turner Bros | Manhole cover with torsion spring hinge to facilitate opening |
EP0451064A1 (en) * | 1990-04-05 | 1991-10-09 | Societe Anonyme Dite : Sodif | Manhole road covering with hinged lid, damping joint and overturning closure |
EP0507708A1 (en) * | 1991-04-05 | 1992-10-07 | Societe Anonyme Dite : Sodif | Safety device for hinged manhole cover |
EP0533533A1 (en) | 1991-09-16 | 1993-03-24 | Pont-A-Mousson S.A. | Locked manhole cover |
EP0741208A1 (en) * | 1995-05-05 | 1996-11-06 | Riccardo Lamperti | Device for closing road wells in vehicle and pedestrian areas |
-
1998
- 1998-09-08 EP EP98116949A patent/EP0985770A1/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2163467A (en) * | 1984-07-13 | 1986-02-26 | Turner Bros | Manhole cover with torsion spring hinge to facilitate opening |
EP0451064A1 (en) * | 1990-04-05 | 1991-10-09 | Societe Anonyme Dite : Sodif | Manhole road covering with hinged lid, damping joint and overturning closure |
EP0507708A1 (en) * | 1991-04-05 | 1992-10-07 | Societe Anonyme Dite : Sodif | Safety device for hinged manhole cover |
EP0533533A1 (en) | 1991-09-16 | 1993-03-24 | Pont-A-Mousson S.A. | Locked manhole cover |
EP0741208A1 (en) * | 1995-05-05 | 1996-11-06 | Riccardo Lamperti | Device for closing road wells in vehicle and pedestrian areas |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1243705A1 (en) * | 2001-03-23 | 2002-09-25 | Societe De Transformation Industrielle De Materiels Orthopediques, Medicaux Plastiques Sigle "Trioplast" | Safety cover for closing openings at waste water purification plants |
FR2822481A1 (en) * | 2001-03-23 | 2002-09-27 | Transformation Ind De Materiel | SAFETY HATCH WHICH CAN BE USED IN PARTICULAR FOR SEALING THE ACCESS HOSES TO PURIFICATION STATIONS |
CN102888857A (en) * | 2012-10-23 | 2013-01-23 | 四川省电力公司西昌电业局 | Pressure-tolerant well cover |
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