EP3019666B1 - Couvercle d'un regard de chaussée - Google Patents
Couvercle d'un regard de chaussée Download PDFInfo
- Publication number
- EP3019666B1 EP3019666B1 EP14747215.3A EP14747215A EP3019666B1 EP 3019666 B1 EP3019666 B1 EP 3019666B1 EP 14747215 A EP14747215 A EP 14747215A EP 3019666 B1 EP3019666 B1 EP 3019666B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cover
- frame
- leg
- manhole cover
- manhole
- 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.)
- Active
Links
- 230000002093 peripheral effect Effects 0.000 claims description 28
- 239000012530 fluid Substances 0.000 claims description 21
- 238000000926 separation method Methods 0.000 claims 1
- 238000004880 explosion Methods 0.000 description 20
- 238000006073 displacement reaction Methods 0.000 description 19
- 239000007789 gas Substances 0.000 description 9
- 239000002360 explosive Substances 0.000 description 8
- 230000000712 assembly Effects 0.000 description 4
- 238000000429 assembly Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000000116 mitigating effect Effects 0.000 description 3
- 230000003466 anti-cipated effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 230000000284 resting effect Effects 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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
- E02D29/1418—Covers for manholes or the like; Frames for covers with implements to assist in lifting, e.g. counterweights, springs
Definitions
- the present invention relates to an explosion mitigating manhole cover, and more particularly to a manhole cover configured to release pressure in a directional manner and limit movement during an explosion event.
- Manhole covers are well known from e.g. document US 6 161 984 A .
- a manhole cover is a removable plate forming the lid over an opening providing access to an underground area also known as a manhole that may include utilities, pipes, cables and passages.
- the lid may, among other things, prevent someone from falling in and keep unauthorized persons out.
- Conventional manhole covers seat on a frame installed over the manhole, sometimes flush with the surface of a road.
- the frame may provide an interface for the manhole cover to seat over the manhole opening, and often times, is secured to the manhole or surrounding structure so that the manhole cover may be removed for access while the frame remains fixed in place.
- Manhole covers often weigh more than 100 pounds, partly because the weight keeps them in place when traffic passes over them, and partly because they are often made out of cast iron, sometimes with infills of concrete. This makes them inexpensive and strong, but heavy.
- manhole covers are sometimes bolted or fastened to the frame. This configuration, however, may not relieve the pressure from an explosion event, thereby potentially causing structural damage to the underground area or to surrounding surface structure, such as the road.
- manhole cover and frame assemblies have been developed to release explosive pressure in a controlled fashion. These assemblies behave similar to a relief valve by allowing the manhole cover to rise in response to explosive pressure and to then reseat once the pressure has subsided. This way, the manhole cover may not become a projectile, or leave the manhole uncovered, in response to an explosive event.
- One type of manhole cover restraint configured to release explosive pressure in a controlled fashion is available on the market under the brand name Swiveloc.
- This manhole cover includes a locking lug and an extendable latch construction that interface with a manhole frame to restrain the manhole cover during an explosive event.
- this cover assembly is not without drawbacks.
- the locking lug appears to be a simple component
- the extendable latch includes multiple interfitting components, which add expense to the overall product and may become susceptible to failure over time.
- the present invention provides a manhole cover assembly configured to behave as a relief valve in an explosion event, enabling opening of the cover in response to such an event so that fluid, such as air or explosive gas, may vent from the area underneath the cover.
- the manhole cover assembly may include a manhole cover and a frame, and may be configured to limit movement of the manhole cover with respect to the frame in response to increased pressure on the manhole cover.
- the manhole cover assembly may be configured to allow limited vertical displacement of all or a portion of the manhole cover with respect to the frame, thereby allowing pressure to release from the underground area through the access opening.
- the manhole cover may include legs having angled surfaces adapted to guide or substantially center the manhole cover in the frame as the manhole cover displaces to release pressure.
- one or more legs may be at least one of (a) pivotable with respect to the manhole cover and (b) slidable within the manhole cover. This may enable configuring the manhole cover between a restraint mode and a removal mode, where the restraint mode may prevent complete removal of the manhole cover from the frame and the removal mode may allow complete removal.
- the legs may extend away from an underside of the manhole cover and toward an access opening of the underground area.
- Each of the legs may include a foot at a first end thereof and that extends toward a peripheral wall of the frame.
- the feet may contact the frame, limiting displacement of the manhole cover with respect to the frame in response to pressure on the underside of the frame.
- the feet may contact a flange or ridge on the peripheral wall of the frame preventing the manhole cover from further vertical displacement with respect to the frame.
- the manhole cover may include an opening through which a leg may slide in a removal mode, and within which the leg may be anchored to the manhole cover in a restraint mode.
- a lug end of the leg may be anchored to the manhole cover preventing the cover from being removed from the frame.
- the leg In the removal mode, the leg may slide freely within the opening to enable removal of the cover.
- a projection at the lug end of the leg and a pin disposed at an opposite end of the leg may prevent the leg from being decoupled from the manhole cover.
- pivotable legs coupled to the manhole cover may be configurable between the removal mode and the restraint mode.
- the legs may pivot freely toward the peripheral wall of the frame but not in the opposite direction beyond a pivot stop. In this way, the legs may interface with the peripheral wall in the restraint mode to limit movement of the manhole cover with respect to the frame, and may enable the manhole cover to be removed from the frame when configured in the removal mode.
- the pivotable legs may rotate up to 90 degrees between the pivot stop and the underside adjacent a peripheral edge of the manhole cover.
- Two legs disposed near each other and configured to pivot in this manner may enable horizontal displacement of the manhole cover in one direction (e.g. a removal direction) while preventing such displacement in the other direction.
- a third leg being configurable to prevent horizontal displacement in the removal direction may therefore maintain the manhole cover in the restraint mode.
- This third leg may also be configurable in the removal mode to allow movement in the removal direction, thereby enabling the two legs to pivot and complete removal of the manhole cover from the frame.
- the manhole cover adapted for angular movement when acting as a relief valve.
- Such an assembly includes a cover having an upper surface, an outer peripheral edge, and first and second legs extending from the cover.
- the legs including radially outwardly extending feet aligned underneath the frame.
- One of the legs is shorter than the other legs to provide the cover with a range of angular movement.
- the cover defines an opening extending through the cover and one of the legs extends through the opening in the cover, wherein the upper end includes a lug and the lower end includes a foot extending outwardly from the leg and underneath a portion of the frame, wherein the first leg is slidably movable within the cover opening to a closed position wherein the lug engages the cover and the foot is spaced at a vertical distance below the underside of said cover with the foot extending radially outwardly underneath the frame such that in response to increased pressure a first portion of the cover has a range of movement with respect to the cover receiving flange that is capable of providing a vertical clearance between the first portion of the cover and the frame to enable the escape of fluids through the access opening, wherein the foot contacts the frame at a limit of the range to prevent the first portion of the cover from moving beyond the limit of the range.
- this embodiment may provide advantages in that it can enable the ability to limit the direction of flow of any gases, flames or fluids will
- a manhole cover assembly according to one embodiment of the present invention is shown in Figs. 1-3 and 6 and generally designated 10.
- the manhole cover assembly 10 generally includes a manhole cover 12 and frame 14 adapted to support the manhole cover 12.
- the manhole cover 12 is configured to behave as a relief valve in an explosion event, opening so that fluid, such as air, explosive gas, or another gas, may vent through the manhole cover assembly 10.
- the manhole cover 12 is configured to limit its movement with respect to the frame 14 in response to increased pressure on the manhole cover 12 and to then return to a seated position once the pressure has subsided.
- the manhole cover 12 includes legs 22, 24, 26 that, when in a locked position (e.g., a restraint mode), may engage the frame 14 to limit displacement of the manhole cover 12 with respect to the frame 14.
- a locked position e.g., a restraint mode
- the manhole cover 12 is fully open with the legs 22, 24, 26 engaged with the frame 14, preventing further vertical displacement of the manhole cover 12 along a central axis 18 of the frame 14 and allowing fluid to flow through the access opening 15.
- the manhole cover 12 is fully closed or seated with the legs 22, 24, 26 disengaged from the frame 14, enabling vertical movement of the manhole cover 12 along the central axis 18 of the frame 14.
- the legs 22, 24, 26 may be configurable from the restraint mode to a removal mode, in which one or more of the legs 22, 24, 26 are adapted to pivot, release, or a combination thereof, in order to clear the frame 14 and enable removal of the manhole cover 12 from the frame 14. Further, in the removal mode, one or more legs 22, 24, 26 may also slide partially through an opening 58 in the manhole cover 12, allowing the one or more legs to be used as a handle for removing the manhole cover 12 from the frame 14. Although described in connection with a manhole cover 12 having two legs 24, 26 capable of pivoting to clear the frame 14, and one leg 22 adapted to slide partially through the opening 58 to clear the frame 14 and to be used as a handle, it should be understood that the present invention is not limited to this configuration.
- the manhole cover 12 may have any number of legs that slide partially and any number of legs adapted to pivot. In another alternative embodiment, the manhole cover 12 may have one or more legs that slide partially through a frame opening to clear the frame 14 without legs capable of pivoting. And in other alternative embodiments, the manhole cover 12 may have one or more legs adapted to pivot to enable removal without legs that partially slide through a frame opening.
- the described embodiment may be used as a manhole cover assembly 10 to cover an access opening 15 and to provide access to an infrastructure, such as a drainage or sewer infrastructure system, underneath the opening 15.
- an infrastructure such as a drainage or sewer infrastructure system
- the manhole cover assembly 10 may be installed over any suitable hole, it will often be installed over a manhole in a street or sidewalk.
- the manhole cover assembly generally includes a frame 14 and a cover 12, each of which is described in more detail below.
- the frame 14 is a generally peripheral structure including a base 34, and a peripheral wall 16 extending upwardly from the base 34 including an inner surface 38 and an outer surface 40.
- the inner surface 38 of the illustrated embodiment may include a cover receiving support 42 configured as a flange to support the manhole cover 12 in a seated position.
- the described frame 14 is annular and may be installed over a manhole (not shown), but it should be appreciated that the frame 14 may be any shape, including rectangular or square.
- the configuration of the top edge 44, inner surface 38, and cover receiving support 42 may be selected to interface with the cover 12 to cover the manhole opening.
- a supporting surface other than the cover receiving support 42, such as the top edge 44 of the frame 14, may support the manhole cover 12 in a seated position to cover the manhole opening 15.
- the frame 14 is installed flush with the surface of a road 8 and fastened to the manhole opening 15 using anchor bolts or angled anchor rods fastened to either the underground area or surrounding road 8.
- the frame 14 may also include cast-in bolts for securing the frame 14 to the manhole opening 15.
- the frame 14 may be a pre-existing frame already installed to cover the manhole opening 15.
- the cover 12 is depicted having a round shape to match the generally annular shape of the frame 14 and peripheral wall 16.
- the cover 12 may have a different shape to cover a variety of differently sized access openings and to interfit with a variety of differently sized frames 14.
- the cover 12 includes a peripheral edge 52, an upper surface 54 and an underside 56.
- the underside 56 may include a seating surface 53 adjacent to the peripheral edge 52 and that interfaces with a supporting surface of the frame 14, such as the cover receiving support 42, in a seated position.
- the cover 12 may include control legs 22, 24, 26 configurable between two modes: a removal mode and a restraint mode.
- the illustrated embodiment includes three control legs 22, 24, 26, but there may be more or fewer legs in alternative embodiments.
- the legs 22, 24, 26 are configured in the restraint mode such that movement of the cover 12 with respect to the frame 14 may be limited.
- the manhole cover 12 may move from a seated position as shown in Fig. 2 to an unseated position as shown in Fig. 1 .
- the illustrated embodiment of Fig. 6 shows the cover 12 configured in a removal mode, enabling the cover 12 to be removed from the frame 14.
- each of the legs 22, 24, 26 includes respectively an angled-guide surface 71, 72, 73 and a foot 74, 75, 76.
- the angled-guide surface and feet may be integrally cast as part of each leg during manufacture.
- the feet 74, 75, 76 extend outwardly toward the peripheral edge 52 of the cover 12, and each may include a frame-stop surface 77, 78, 79 that may be configured to contact the frame 14 in order to limit vertical displacement of the cover 12 with respect to the frame 14 along the central axis 18.
- the feet 74, 75, 76 may contact the underside of the frame supporting surface 47 limiting movement of the cover 12 in an explosion event.
- the legs 22, 24, 26 may not include angled-guide surfaces 71, 72, 73 in an alternative embodiment.
- the angled-guide surfaces 71, 72, 73 may not be angled.
- the cover 12 may displace vertically with respect to the central axis 18 as pressure rises on the underside 56 of the cover 12, thereby behaving as a relief valve to allow fluid through the access opening 15.
- the angled guide surfaces 71, 72, 73 may interface with the inner surface 38 of the frame 14 to guide the cover 12 toward the center of the frame 12.
- the cover 12 is capable of displacing up to 8 inches vertically along the central axis 18 from a seated position on the frame 14.
- the range over which the cover 12 is capable of moving may vary from application to application depending on the desired pressure release capability of the manhole cover assembly 10.
- the distance between the seating surface 53 and the frame-stop surfaces 77, 78, 79 may be decreased so that the cover 12 is capable of displacing up to 4 inches instead of 8 inches, decreasing the maximum allowable fluid flow.
- the vertical displacement capability of the cover 12 may be increased in order to allow greater fluid flow. The range may also vary depending on other constraints, such a displacement height limitation.
- the control legs 22, 24, 26 may be configurable between a removal mode and a restraint mode. In either mode, two of the control legs 24, 26 may be pivotally mounted to the underside 56 of the cover 12, though a greater or fewer number of control legs may be pivotally mounted in alternative embodiments.
- the underside 56 of the cover 12 may include mounting flanges 61, 63 and pins 62, 64 capable of pivotally receiving the legs 24, 26.
- the mounting flanges 61, 63 respectively include a pivot stop 65, 66 and may be configured to allow the control legs 24, 26 to rotate approximately 90 degrees between the seating surface 53 and the pivot stops 65, 66.
- the manhole cover assembly 10 may be configured to enable more or less than 90 degree rotation of the control legs 24, 26 depending on the desired configuration.
- the pivot stops 65, 66 may prevent further rotation of the control legs 24, 26 beyond 90 degrees so that, in the restraint mode, the feet 75, 76 and angled-guide surfaces 71, 72 of the control legs 24, 26 interface with the frame 14 to limit movement of the cover 12.
- control legs may be fixedly anchored to the cover 12 in the restraint mode while being slidably coupled to the cover 12 in the removal mode.
- the control leg 22 may include a projection 23, or lug, having a hole 25 capable of being fastened with an anchor bolt 27 to the cover 12 so that the control leg 22 is fixedly anchored to the cover 12.
- the control leg 22 need not be fixedly anchored to the cover 12 in order to limit movement of the cover 12 with respect to the frame 14 in response to increased pressure. If the anchor bolt 27 or a fastener for the control leg 22 is misplaced, damaged or defective, the cover 12 and the control leg 22 may remain inherently capable of limiting movement of the cover 12.
- the cover 12 may be in the removal mode but still configured for limited movement during an explosion event.
- the projection 23 may interface with the cover 12 to enable the cover 12 to behave as a relief valve.
- the cover 12 may include a control leg anchor opening 58 defining an opening through the cover 12 from the upper surface 54 to the underside 56.
- the control leg 22 may slide within this opening 58 in the removal mode so that the control leg 56 can be slid up and away from the frame 14, thereby enabling removal of the cover 12 from the frame 14.
- the control legs 24, 26 may rotate toward the seating surface 53, thereby freeing the cover 12 from the frame 14 so that it can be removed.
- the control leg 22 may include a pin 21 that prevents the control leg 22 from sliding completely through the opening 58 in the removal mode. This pin 21 may be installed during manufacture after the control leg 22 is inserted through the opening 58.
- the cover 12 of the illustrated embodiment may be configured between two modes: a restraint mode and a removal mode.
- the cover 12 In the restraint mode, the cover 12 may behave as a relief valve, displacing vertically in response to a pressure on the underside 56 exceeding a threshold and enabling fluid to vent through the access opening 15.
- the cover 12 may return to a seated position on the frame 14 after the pressure has subsided. In this way, if an explosion event occurs, damage to the manhole cover assembly 10 and surrounding structure, such as the road 8 or the underground area, may be prevented or mitigated.
- the pressure threshold resulting in displacement of the cover 12 may vary from application to application, generally depending on the weight of the cover 12, and to the extent there are other fluid paths from the underground area.
- the pivotable control legs 24, 26 may be placed within the access opening 15 such that they hang, possibly resting against the pivot stops 65, 66.
- the seating surface 53 of the underside 56 may be positioned to rest on the cover receiving support 42 of the frame 14.
- the control leg 22 may slide within the control leg anchor opening 58 until the projection 23 of the control leg 22 contacts the upper surface 54 of the cover 12.
- An anchor bolt 27 may fasten the control leg 22 to the cover 12 so that the control leg 22 is stationary. It should be appreciated that fastening systems other than an anchor bolt 27 may be used to anchor the control leg 22 to the cover 12, and that the present invention is not limited to using an anchor bolt 27.
- the anchor bolt 27 or other fastener may be configured to be tamper resistant so that the cover 12 may be considered an unauthorized access deterrent.
- the bolt may be a penta-head bolt or another bolt type capable of deterring unauthorized access.
- the cover 12 may have a limited range of movement with respect to the frame 14 such that it may behave as a relief valve.
- the cover 12 may not be removed completely from the frame 14 without being reconfigured into the removal mode.
- the feet 74, 75, 76 may interfere with a portion of the frame 14 preventing vertical movement of the cover 12 beyond a certain point with respect to the frame 14.
- a portion of the peripheral wall 16 of frame 14, such as a flange, may be circular, and the feet 74, 75, 76 may be arranged such that a circle circumscribed about the feet 74, 75, 76 has a diameter larger than an inner diameter of the peripheral wall 16.
- a circle circumscribed about the angled-guide surfaces 71, 72, 73 may have a diameter less than that of the peripheral wall 16.
- the angled-guide surfaces 71, 72, 73 may enable the manhole to move vertically with respect to the frame, while the feet 74, 75, 76 limit this vertical movement by contacting the peripheral wall.
- Removal of the cover 12 may be enabled by configuring the cover into the removal mode. In this mode, any fastener holding the control leg 22 in place may be loosened or removed so that the control leg 22 may clear the frame 14.
- the pivotable control legs 24, 26 may pivot toward the seating surface, shown for example in Fig. 6 , in order to clear the frame as well. With the legs 22, 24, 26 in this configuration, the cover 12 may be removed from the frame 14 in order to access the manhole or underground area.
- FIG. 7-15 A second embodiment of the explosion mitigating manhole cover is shown in Figs. 7-15 and generally designated 100.
- the manhole cover assembly 100 generally includes a manhole cover 112 and frame 114 adapted to support the manhole cover 112.
- the manhole cover 112 is configured to behave as a relief valve in an explosion event, opening so that fluid, such as air, explosive gas, or another gas, may vent through the manhole cover assembly 100.
- the manhole cover assembly 100 varies from the first embodiment in that upon the pressure under the manhole cover 112 reaching a threshold, the manhole cover 112 lifts angularly - rather than strictly vertically - with respect to the frame 114.
- the manhole cover 112 is configured to limit the movement of the cover 112 with respect to the frame 114 in response to increased pressure on the manhole cover 112 and to then return the opened portion of the cover 112 to a seated position once the pressure has subsided.
- the manhole cover 112 includes legs 122 and 124 that, when in a locked position (e.g., a restraint mode), may engage the frame 114 to limit displacement of the manhole cover 112 with respect to the frame 114.
- the leg 122 may be longer than the leg 124, causing the cover 112 to displace angularly.
- a locked position e.g., a restraint mode
- the manhole cover 112 is fully open with the legs 122 and 124 engaged with the frame 114, preventing further angular displacement of the manhole cover 112 about an axis that generally extends through the support flange of the frame 114, about which the leg 124 rotates. This position allows fluid to flow through the access opening 115 and directs such flow in a particular direction defined by the positioning of the leg 122. And, in the illustrated embodiment of Fig. 12 , the manhole cover 112 is fully closed or seated with the leg 122 disengaged from the frame 114, enabling angular movement of the manhole cover 112.
- the legs 122 and 124 may be configurable from the restraint mode to a removal mode, in which one or more of the legs 122, 124 are adapted to pivot, release, or a combination thereof, in order to clear the frame 114 and enable removal of the manhole cover 112 from the frame 114. Further, in the removal mode, one or more legs 122, 124 may also slide partially through an opening 158 in the manhole cover 112, allowing the one or more legs to be used as a handle for removing the manhole cover 112 from the frame 114.
- the frame 114 of the second embodiment is substantially similar to the frame 14 of the first embodiment and thus will not be described again in detail.
- the frame 114 includes a base 134, and a peripheral wall 116 extending upwardly from the base 134 including an inner surface 138 and an outer surface 140.
- the inner surface 138 of the illustrated embodiment may include a cover receiving support 142 configured as an inwardly extending flange to support the manhole cover 112 in a seated position with the underside of the cover 112 resting on the support flange 142.
- the described frame 114 is annular and may be installed over a manhole (not shown), it should be appreciated that the frame 114 may be any shape, including rectangular or square.
- the configuration may be selected to interface with the cover 112 to cover the manhole opening.
- a supporting surface other than the cover receiving support 142 such as the top edge 144 of the frame 114, may support the manhole cover 112 in a seated position to cover the manhole opening 115.
- the frame 114 as described is for illustrative purposes only, as the cover 112 may be designed to retrofit onto many different types of frames 114 to convert those manhole cover assemblies into explosion mitigation assemblies.
- the cover 112 is generally similar to that depicted in the first embodiment, having a round shape to match the generally annular shape of the frame 114 and peripheral wall 116. Alternatively, the cover 112 may have a different shape to cover a variety of differently sized access openings and to interfit with a variety of differently sized frames 114.
- the cover 112 includes a peripheral edge 152, an upper surface 154 and an underside 156.
- the underside 156 may include a seating surface 153 adjacent to the peripheral edge 152 that interfaces with a supporting surface of the frame 114, such as the cover receiving support 142, in a seated position.
- the cover 112 includes a pair of legs 122, 124.
- the legs 122, 124 may be configurable between two modes: a removal mode and a restraint mode.
- the legs 122, 124 are configured in the restraint mode such that movement of the cover 112 with respect to the frame 114 may be limited.
- the manhole cover 112 may move from a seated position as shown in Fig. 12 to an unseated position as shown in Fig. 10 .
- the illustrated embodiment of Fig. 13 shows the cover 112 configured in a removal mode, enabling the cover 112 to be removed from the frame 114.
- each of the legs 122, 124 includes a foot 174, 175 respectively.
- the feet may be integrally cast as part of each leg during manufacture.
- the feet 174, 175 may extend radially outwardly toward the peripheral edge 152 of the cover 112, and each may include a frame-stop surface 177, 178 that may be configured to contact the frame 114 in order to limit displacement of the cover 112 with respect to the frame 114.
- the feet 174, 175 may project radially outwardly beyond the peripheral edge 152 of the cover 112 in order to be aligned underneath the frame 114.
- the feet 174, 175 are thus aligned vertically underneath the frame 114, at least when the cover 112 is in the restraint mode.
- the feet 174, 175 may contact the underside of the frame supporting surface 142 limiting movement of the cover 112 in an explosion event.
- at least one of the legs 122 may include an angled guide surface 172; however, the angled guide surface of the leg 122 may be provided with a generally curved, convex shape. This shape may aid in holding the cover 112 tightly against the frame 114, particularly in the area of the second leg 124, as the cover 112 moves through an angular range of motion.
- leg 122 may be the same as or similar to the leg 22 of the first embodiment, wherein it can be fixedly anchored to the cover 112 in the restraint mode while being slidably coupled to the cover 112 in the removal mode. This leg thus determines whether or not the cover 112 is in the restraint mode or the removal mode.
- the control leg 122 may include a projection 123, or lug, having a hole 125 capable of being fastened with an anchor bolt 127 to the cover 112 so that the control leg 122 is fixedly anchored to the cover 112. This fastens the leg 122 to the cover 112 and prevents the unwanted movement of the leg 122.
- control leg 122 need not be fixedly anchored to the cover 112 in order to limit movement of the cover 112 with respect to the frame 114 in response to increased pressure. If the anchor bolt 127 or a fastener for the control leg 122 is misplaced, damaged or defective, the cover 112 and the control leg 122 may remain inherently capable of limiting movement of the cover 112. In other words, without the control leg 122 fixedly anchored to the cover 12, the cover 112 may be in the removal mode but still configured for limited movement during an explosion event. For instance, if the anchor bolt 127 is not present, the projection 123 may interface with the cover 112 to enable the cover 112 to behave as a relief valve.
- the leg 122 may be inserted through a control leg anchor opening 158 defined in the cover 112 from the upper surface 154 to the underside 156.
- the control leg 122 may slide within this opening 158 so that the control leg 122 can be slid up and away from the frame 114, thereby enabling removal of the cover 112 from the frame 114.
- the movement of the leg 122 is similar to that of the first embodiment, wherein the leg 122 can move vertically, such that the upper end of the leg including the lug 123 extends out of the upper surface 154 of the cover 112, as well as pivotally, wherein the foot 174 moves radially inwardly so that it is no longer aligned vertically underneath the frame 114.
- the second leg 124 may rotate about the frame 114 to a position where the cover 112 is freed from the frame 114 so that it can be removed.
- the control leg 122 may include a pin 121 that prevents the control leg 122 from sliding completely through the opening 158 in the removal mode. This pin 121 may be installed during manufacture after the control leg 122 is inserted through the opening 158.
- the second leg 124 is spaced from the control leg 122 and also shorter in length than the control leg 122.
- the second leg is positioned diametrically opposite the control leg 122.
- the second leg 124 may be spaced in a different location, and the cover 112 may include multiple second legs 124 to aid retaining the cover 112.
- One result of this variation is that the cover 112 - upon experiencing a threshold level of pressure on the underside - will be displaced to open in an angular fashion with respect to the frame 114.
- the portion 200 of the cover 112 proximate the longer control leg 122 is capable of a range of movement determined by the length of the control leg 122, which in the illustrated embodiment may be 8". This portion 200 of the cover thus is capable of clearing the frame 114 - with the underside 156 of the cover 112 above the upper edge 140 of the frame 114.
- the portion 202 of the cover 112 proximate the shorter second leg 124 has a smaller range of movement than the portion 200.
- the length of the second leg 124 is controlled such that the foot 175 of the second leg 124 contacts the frame 114 when the cover 112 is closed. More particularly, as shown in Fig.
- the foot 175 may include a curved contact surface 178, such that a distal portion 179 contacts the frame 114 when the cover is closed.
- This configuration enables the portion 202 of the cover 112 to rotate about the frame mount flange 142, which extends between the foot 175 and the underside 156 of the cover 112.
- the curved surface 178 may provide clearance that enables such rotation.
- the portion 202 of the cover 112 proximate the second leg 124 undergoes essentially no vertical movement when the portion 200 is displaced, and the portion 202 of the cover 112 proximate the second leg 124 does not clear the frame 114.
- the second leg 124 may be longer than that shown in the illustrated embodiment, for example, to interfit with a different frame 114 that may have a wider support flange 142, or to provide some degree of vertical displacement for the second leg 124 and the portion 202 of the cover 112 proximate thereto.
- the angular displacement of the cover 112 can be advantageous in that it limits the direction in which exiting fluids can flow. Instead of allowing fluids to escape through a 360 degree range, the angular displacement of the cover reduces the circumferential range that exiting fluids can flow. In addition, it is possible to orient the cover 112 during installation to direct any gases or flames that may exit the cover assembly 100 during an explosion event.
- the cover 112 may be keyed, for example, by cooperating structure on the frame and cover, such that the longer leg 122 must face the building, such that when the cover 112 is displaced angularly upon the pressure under the cover reaching a threshold, escaping gases, fluids and flames will be directed toward the building rather than toward the open sidewalk which may be likely to contain people.
- the cover 112 of the second embodiment may be configured between two modes: a restraint mode and a removal mode.
- the cover 112 may behave as a relief valve, displacing angularly in response to a pressure on the underside 156 exceeding a threshold and enabling fluid to vent through the access opening 115.
- the cover 112 may return to a seated position on the frame 114 after the pressure has subsided. In this way, if an explosion event occurs, damage to the manhole cover assembly 100 and surrounding structure, such as the road or the underground area, may be prevented or mitigated.
- the pressure threshold resulting in displacement of the cover 112 may vary from application to application, generally depending on the weight of the cover 112, and to the extent there are other fluid paths from the underground area.
- the second leg 124 may be placed within the access opening 115 and interfitted with the frame 114 such that the foot 175 extends underneath a portion of the frame 114.
- the control leg 122 may slide within the control leg anchor opening 158 until the projection 123 of the control leg 122 contacts the upper surface 154 of the cover 112.
- An anchor bolt 127 may fasten the control leg 122 to the cover 112 so that the control leg 122 is stationary. It should be appreciated that fastening systems other than an anchor bolt 127 may be used to anchor the control leg 122 to the cover 112, and that the present invention is not limited to using an anchor bolt 127.
- the anchor bolt 127 or other fastener may be configured to be tamper resistant so that the cover 112 may be considered an unauthorized access deterrent.
- the anchor bolt 127 is a bolt
- the bolt may be a penta-head bolt or another bolt type capable of deterring unauthorized access.
- the cover 112 may have a limited range of movement with respect to the frame 114 such that it may behave as a relief valve.
- the cover 112 may not be removed completely from the frame 114 without being reconfigured into the removal mode.
- the feet 174, 175 may be aligned underneath the frame 114 and thus interfere with a portion of the frame 114 preventing vertical movement of the cover 112 beyond a certain point with respect to the frame 114.
- a portion of the peripheral wall 116 of frame 114 such as a flange, may be circular, and the feet 174, 175 may be arranged such that a circle circumscribed about the feet 174, 175 has a diameter larger than an inner diameter of the peripheral wall 116.
- a circle circumscribed about the angled-guide surfaces 171, 172 may have a diameter less than that of the peripheral wall 116.
- Removal of the cover 112 may be enabled by configuring the cover into the removal mode. In this mode, any fastener holding the control leg 122 in place may be loosened or removed so that the control leg 122 may clear the frame 114. The cover may be pivoted open until the second leg 124 is capable of clearing the frame 114. With the legs 122, 124 in this configuration, the cover 112 may be removed from the frame 114 in order to access the manhole or underground area.
- the disclosed embodiments include a plurality of features that are described in concert and that might cooperatively provide a collection of benefits.
- the present invention is not limited to only those embodiments that include all of these features or that provide all of the stated benefits, except to the extent otherwise expressly set forth in the issued claims. Any reference to claim elements in the
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)
- Pressure Vessels And Lids Thereof (AREA)
Claims (10)
- Plaque d'égout adaptée pour se comporter comme une soupape de sûreté pour relâcher de la pression, ladite plaque d'égout étant mobile d'une position assise à une position non assise par rapport à un cadre, le cadre ayant une paroi périphérique définissant une ouverture d'accès, ladite plaque d'égout comprenant :une partie de couvercle (112) ayant une surface supérieure, un bord périphérique extérieur, et une côté inférieur en vis-à-vis de ladite surface supérieure, caractérisée en ce queune jambe de commande (122) s'étendant à partir dudit côté inférieur de ladite partie de couvercle et comportant un pied (174) s'étendant radialement vers l'extérieur à partir de ladite jambe de commande (122) jusqu'à une position sous ledit cadre, ledit pied (174) étant espacé verticalement au-dessous dudit cadre pour permettre à au moins une partie dudit couvercle à proximité de ladite jambe de commande d'avoir une plage de déplacement, de telle sorte que ladite partie dudit couvercle est capable de se déplacer à l'intérieur de ladite plage de déplacement lorsqu'un niveau de pression sur ledit côté inférieur atteint un seuil, ledit pied (174) étant en contact avec ledit cadre à une limite de ladite plage de déplacement dans laquelle ladite partie dudit couvercle dégage ledit cadre pour permettre à un fluide de s'écouler à partir de ladite ouverture d'accès ; etune première jambe (124) s'étendant à partir dudit côté inférieur de ladite partie de couvercle (112), ladite première jambe (124) étant espacée de ladite jambe de commande (122), ladite première jambe (124) comprenant un pied (175) s'étendant radialement vers l'extérieur à partir de ladite première jambe (124) jusqu'à une position au-dessous dudit cadre, ledit pied (175) sur ladite première jambe (124) venant au contact dudit cadre pour empêcher qu'une partie dudit couvercle à proximité de ladite première jambe ne dégage ledit cadre.
- Plaque d'égout selon la revendication 1 comprenant en outre :une ouverture (158) à travers la partie de couvercle allant de ladite surface supérieure audit côté inférieur ;ladite jambe de commande (122) est couplée à ladite partie de couvercle (112) et peut être configurée entre un mode de retenue et un mode de retrait, ladite jambe de commande (122) étant adaptée pour coulisser à l'intérieur de ladite ouverture (158) dans ledit mode de retrait et adaptée pour se fixer à ladite partie de couvercle (112) dans ledit mode de retenue de telle sorte que ladite jambe de commande (122) est verrouillée en place dans ledit mode de retenue.
- Plaque d'égout selon la revendication 1, dans laquelle ladite jambe de commande (122) comprend une surface convexe inclinée configurée pour servir d'interface avec la paroi périphérique du cadre afin d'empêcher la séparation entre ladite première jambe (124) et ledit cadre lorsque ledit couvercle se déplace dans ladite plage de déplacement lorsqu'un fluide est évacué à partir de l'ouverture d'accès dans ladite position non assise.
- Plaque d'égout selon la revendication 1, dans laquelle ladite plaque d'égout est adaptée pour évacuer un fluide en déplaçant ladite partie dudit couvercle à proximité de ladite jambe de commande (122) entre 2 et 8 pouces verticalement par rapport au cadre.
- Plaque d'égout selon la revendication 1, dans laquelle ledit pied (175) sur ladite première jambe (124) vient au contact dudit cadre tout au long de ladite plage de déplacement de ladite partie dudit couvercle à proximité de ladite jambe de commande (122).
- Plaque d'égout selon la revendication 1, dans laquelle ladite première jambe (124) et ladite jambe de commande (122) sont diamétralement opposées sur ledit couvercle.
- Plaque d'égout selon la revendication 6, dans laquelle une partie dudit pied (175) sur ladite première jambe (124) met en prise le cadre lorsque ledit couvercle est dans ladite position assise.
- Plaque d'égout selon la revendication 7, dans laquelle ledit pied (175) de ladite première jambe (124) tourne autour d'une partie du cadre lorsque ladite partie dudit couvercle à proximité de ladite jambe de commande (122) se déplace dans ladite plage de déplacement.
- Plaque d'égout selon la revendication 8, dans laquelle ledit couvercle définit une ouverture (158) et ladite jambe de commande (122) peut être retirée de manière coulissante dudit couvercle en soulevant un crochet (123) sur ladite jambe de commande (122) afin de faire pivoter ladite jambe de commande (122) dans ladite ouverture (158) et en tirant ladite jambe de commande (122) à travers ladite ouverture (158).
- Plaque d'égout selon la revendication 9, dans laquelle une longueur de ladite jambe de commande (122) est au moins quatre fois supérieure à une longueur de ladite première jambe (124).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/940,698 US8784000B2 (en) | 2012-12-13 | 2013-07-12 | Explosion mitigating cover |
PCT/US2014/046148 WO2015006559A1 (fr) | 2013-07-12 | 2014-07-10 | Couvercle de trou d'homme |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3019666A1 EP3019666A1 (fr) | 2016-05-18 |
EP3019666B1 true EP3019666B1 (fr) | 2017-11-15 |
Family
ID=51263516
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14747215.3A Active EP3019666B1 (fr) | 2013-07-12 | 2014-07-10 | Couvercle d'un regard de chaussée |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP3019666B1 (fr) |
CA (1) | CA2855200C (fr) |
ES (1) | ES2660066T3 (fr) |
TR (1) | TR201802138T4 (fr) |
WO (1) | WO2015006559A1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111546284A (zh) * | 2020-05-25 | 2020-08-18 | 重庆水泵厂有限责任公司 | 组合式人孔工装与内压式人孔安装方法 |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2543642B (en) | 2015-09-17 | 2021-01-20 | Neenah Foundry Company | Manhole cover assembly |
GB2542506B (en) | 2015-09-17 | 2021-03-24 | Neenah Foundry Company | Manhole cover assembly |
US10233609B2 (en) | 2017-04-19 | 2019-03-19 | Neenah Foundry Company | Floating manhole cover assembly |
US11414829B2 (en) | 2019-10-07 | 2022-08-16 | Neenah Foundry Company | Hybrid manhole cover |
CN112095672B (zh) * | 2020-09-15 | 2022-03-18 | 北华大学 | 一种道路井盖更换用装置 |
CN115367324B (zh) * | 2022-07-14 | 2023-04-11 | 阳春市中聚机械科技有限公司 | 一种平移式可视人孔盖装置 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6161984A (en) * | 1999-08-12 | 2000-12-19 | Sinclair; David Brent | Manhole or catch basin assembly |
-
2014
- 2014-06-25 CA CA2855200A patent/CA2855200C/fr active Active
- 2014-07-10 WO PCT/US2014/046148 patent/WO2015006559A1/fr active Application Filing
- 2014-07-10 EP EP14747215.3A patent/EP3019666B1/fr active Active
- 2014-07-10 ES ES14747215.3T patent/ES2660066T3/es active Active
- 2014-07-10 TR TR2018/02138T patent/TR201802138T4/tr unknown
Non-Patent Citations (1)
Title |
---|
None * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111546284A (zh) * | 2020-05-25 | 2020-08-18 | 重庆水泵厂有限责任公司 | 组合式人孔工装与内压式人孔安装方法 |
CN111546284B (zh) * | 2020-05-25 | 2021-06-22 | 重庆水泵厂有限责任公司 | 组合式人孔工装与内压式人孔安装方法 |
Also Published As
Publication number | Publication date |
---|---|
ES2660066T3 (es) | 2018-03-20 |
CA2855200A1 (fr) | 2015-01-12 |
TR201802138T4 (tr) | 2018-03-21 |
WO2015006559A1 (fr) | 2015-01-15 |
EP3019666A1 (fr) | 2016-05-18 |
CA2855200C (fr) | 2016-12-06 |
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