EP0031641A2 - Couvercles amovibles et châssis correspondants - Google Patents

Couvercles amovibles et châssis correspondants Download PDF

Info

Publication number
EP0031641A2
EP0031641A2 EP80304044A EP80304044A EP0031641A2 EP 0031641 A2 EP0031641 A2 EP 0031641A2 EP 80304044 A EP80304044 A EP 80304044A EP 80304044 A EP80304044 A EP 80304044A EP 0031641 A2 EP0031641 A2 EP 0031641A2
Authority
EP
European Patent Office
Prior art keywords
cover
frame
cover unit
perimeter
barrier plate
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
EP80304044A
Other languages
German (de)
English (en)
Other versions
EP0031641B1 (fr
EP0031641A3 (en
Inventor
Clive Bowley
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.)
Dover Engineering Works Ltd
Original Assignee
Dover Engineering Works Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dover Engineering Works Ltd filed Critical Dover Engineering Works Ltd
Publication of EP0031641A2 publication Critical patent/EP0031641A2/fr
Publication of EP0031641A3 publication Critical patent/EP0031641A3/en
Application granted granted Critical
Publication of EP0031641B1 publication Critical patent/EP0031641B1/fr
Expired legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D29/00—Independent underground or underwater structures; Retaining walls
    • E02D29/12—Manhole shafts; Other inspection or access chambers; Accessories therefor
    • E02D29/14—Covers for manholes or the like; Frames for covers
    • E02D29/149—Annular gaskets
    • 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
    • E02D29/1454—Non-circular covers, e.g. hexagonal, elliptic
    • 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

Definitions

  • This invention relates to removable covers (particularly, but not exclusively, manhole covers) for openings and frames in which such covers are supported.
  • a cover unit for a pit opening comprising a frame for bounding the mouth of the opening, a cover seated in the frame to close off the opening, and a gas impervious barrier plate which is supported by the frame to extend across the opening beneath the cover and which is urged by the weight of the cover into making a gas-tight seal with the cover to inhibit the passage to the cover of any gaseous material passing up the opening.
  • the cover unit comprises a cast iron frame defining a well having an open base and a perimeter around the base, a cast iron cover mounted in the frame well to be supported on the base and close off the opening therein and fit against the perimeter of the frame, the mating surfaces of the cover and the frame having a machined finish so that there is metal-to-metal contact therebetween, and a barrier plate which is impervious to gas and which is not subject to corrosion by effluent gases from sewerage supported by the base of the frame below the cover and spanning the opening in the open base, the weight of the cover pressing the plate downwardly upon the frame base by which the plate will provide a gas impervious barrier between the underside of the cover and effluent gases from sewerage when the cover unit is used in a sewerage system.
  • a manhole cover unit 1 comprises a cover 2 seated in a frame 3. Also seated in the frame 3 is a plate 4 which seals against the frame as by the interposition between the two of a sealing gasket 5. Whilst the weight of the cover 2 is mainly taken by the frame 3, the cover bears against the plate 4 so ensuring a seal as between the gasket 5 and the frame.
  • the frame 3 is set in a rebate 6 around the mouth of the pit opening 7 in the floor 8 or the like whose surface is referenced 9.
  • the rebate 6 would have a concrete infill C to bed down and firmly secure the frame 3 around the mouth of the pit opening 7. As such, it would only be the interior surfaces of the frame which would be exposed to the effluent gases and the like emitted up the pit opening 7 when the manhole cover unit 1 is used in a sewerage system.
  • the purpose of the plate 4 which overlies the base of the frame 3 and which is sealed thereagainst by the gasket 5 is primarily to provide a gas impervious barrier as between the effluent gases from the pit opening 7 and the underside of the cover 2.
  • the cover 2 is of cast iron, there can be a tendency for its underside to be subject to corrosion upon exposure to sewerage effluent gases.
  • the internal surfaces of the frame 3 are largely also isolated by the barrier plate 4 from the effluent gases and hence when the frame also is of cast iron it too is saved by the plate from corroding.
  • the cover 2 makes sealing contact with the frame 3 such that much of the frame would be sealed oil by tne cover itself from exposure to the effluent gases, but the barrier plate 4 ensures that there is little or no escape of those gases from the pit opening so that there results only the minimal amount of gas at most which could escape past the cover to the frame.
  • a suitable non-corrosive material for the barrier plate 4 would be a glass reinforced synthetic plastics material, but other materials may be equally as suitable.
  • the gasket 5 may be of neoprene suitably bonded all round the margin of the barrier plate 4. Although not preferred, the gasket 5 could be separate from the barrier plate 4 and, perhaps, bonded to the frame 3.
  • the manhole cover unit 1 there is also a need where sand is present for the manhole cover unit 1 to be so constructed as to inhibit the ingress of sand into the pit opening 7.
  • the sealing contact, which has been briefly referred to, made by the cover 2 within the frame 3 is sufficient in itself to prevent effectively sand from infiltrating between the cover and the frame into the pit opening.
  • the barrier plate 4 will make for a completely sand proof unit since any sand which may manage to penetrate the unit will simply collect on top of the barrier plate.
  • the barrier plate 4 serves the dual purpose of sealing off the pit opening 7 both to prevent the passage of effluent gases out of the opening and into contact with the cover 2, and to prevent the passage of sand from the environment into the opening (the latter in conjunction with the sealing contact between the cover and its frame 3.)
  • the base of the frame 3 is an effectively continuous horizontal flange 10 running completely around its inside.
  • the flange 10 is rebated at 11 to provide a ledge 12. It is on that ledge 12 that the barrier plate 4 seats with its gasket 5 making a seal with the ledge.
  • the ledge 12 is immediately adjacent the mouth of the pit opening 7 so that the seal is effected actually at the pit opening with the result that a minimal area of the frame 3 will be subject to the corrosion attack of the effluent gases. More particularly, it is the inner vertical perimeter face 13' of the ledge 12 which is the only part of the frame 3 not isolated by the barrier plate 4 from the noxious gases.
  • the thickness of the barrier plate 4 with its sealing gasket 5 relative to the depth of the flange rebate 11 is important. If the plate is too thin, the cover 2 will not actually contact it, and it is the weight of the cover which presses the gasket 5 into sealing engagement with the ledge 12. If the plate 4 is too thick, the plate will hold the cover 2 off the flange 10, and the cover and the frame are fashioned so that the cover should make continuous horizontal sealing contact with the flange. In practice, the barrier plate is deformable and is made slightly oversize in thickness to an extent such that the weight of the cover 2 will compress the plate sufficiently to allow the cover to seat on the frame 3.
  • the frame is constituted by four perimeter bars, namely (and these are terms of the art) a front end bar 13, a back end bar 14, a left hand side bar-15 and a right hand side bar 16, which are bolted together at 17 at the corners of the frame so as together to form a rigid structural unit.
  • the side bars 15 and 16 are of similar construction, each being of generally L cross-section with the base of the L being constituted by one run of the flange 10.
  • the upright 18 of the L is slightly inclined to the vertical so that the spacing between the opposite uprights is greater at the top than at their junctions witft the respective flanges 10.
  • the internal surface 19 of each upright 18 is relieved along its length at 20 as also is the corner 21 between the upright and the respective flange 10. Apart from that relieving, the internal surface 19 and the upper surface 22 of the flange 10 has a machined finish, the purpose of which is to effect the described sealing contact with the cover 2.
  • Each side bar 15, 16 is strengthened by an interrupted external horizontal rib 23 integral with and running the length of the upright 18, and by two spaced external intermediate vertical flanges 24. Finally, the opposite ends of each side bar 15, 16 terminate in deeper flanges 25, and it is at those flanges that the side bars are bolted to the adjacent end bars 13 and 14.
  • the rib 23 and flanges 24 not only strengthen the side bar but also serve as a key with respect to the concrete infill C.
  • the front end bar 13 (see also Figures 5 and 6) is also of generally L cross-section with the base of the L being again constituted by one run of the flange 10.
  • the upright, referenced 26, of the L is slightly inclined to the vertical in a like manner to the sloping of the side bar upright 18.
  • the upright 26 has integral strengthening vertical flanges 27 and an interrupted horizontal rib 28, which extends substantially its length.
  • the bolting 17 of the two side bar flanges 25 to the front end bar 13 is to the opposite ends of the upright 26.
  • the internal surface 29 of the upright 26 is relieved at 30 as also is the junction 31 between that upright and the flange 10 integral with it, and apart from that relieving, the internal surface 29 and the upper surface 32 of that same flange is given a machined finish.
  • the back end bar 14 is generally similar in construction to the front end bar 13 apart from the distinction that the upright of its L-section, although sloping at the same angle as the upright of the bar 13, does so in the opposite direction. The result is that instead of the spacing between the opposite uprights of the front and back end bars being greater at the top than at the bottom, the spacing is of constant dimension.
  • the upright of the back end bar 14 is denoted by reference 26a but its other components have like references to those identifying their counterparts in the front end bar 13.
  • the faces which abut when the bars are bolted together are each recessed and the mating such recesses are filled with a sealing material, preferably molten lead.
  • a sealing material preferably molten lead.
  • the construction is shown in Figures 4 and 5, the lead recess 33 in the end face 34 of the flange 25 of the side bar 15 (or 16) being similar in shape to the mating lead recess 35 in the internal face 29 at each of the opposite ends of the front end bar 13 (or back end bar 14).
  • the bolting 17 is through registering holes 36 in the perimeter bars.
  • the frame 3 essentially is constituted by a generally L perimeter section which provides a well into which the cover 2 is sunk to seat on the base of the well and seal both on that base and against the upstanding side faces of the well.
  • the cover 2 would have a perimeter conforming to that of the well to ensure such seating and sealing.
  • the opposite inclination of the sides of the well assists the entry and guidance of the cover into the well, and the same inclination of the ends of the well assists the removal of the cover from the well. The latter is because the cover would be removed by lifting up its forward end, seating that end against the front end bar and sliding the cover forwardly with its underside supported on the side bar flanges 10.
  • cover 2 is a one-piece or unitary member having a solid top plate 37 from which depend a plurality of mutually intersecting longitudinal and lateral ribs 38 and 39, respectively, which form a honeycomb bracing structure on the underside of the top plate to give the cover the necessary dimensional stability and strength.
  • the opposite end surfaces, all referenced 41, of the longitudinal ribs 38 and the lateral ribs 39 also follow the inclinations of and mate with the corresponding surfaces of the frame perimeter bars, and are also machined for the same reason.
  • the base surfaces, all referenced 42, of the longitudinal ribs 38 and the lateral ribs 39 are machined to make good sealing contact at their opposite longitudinal terminal portions with the base flange of the frame periphery bars.
  • Jackscrew lifting keyholes 43 are provided in the upper surface of the solid top plate 37 at its front end, and guide keyholes 44 in the same upper surface at its sides near to its rear end. Inwardly of the margin 45 of the plate 37, its upper surface is recessed at 46 and gripping lozenges 47 are upstanding over the whole general area of that recessed region.
  • cover 2 Whilst a solid top plate construction of cover 2 is shown, other cover structures could be equally as suitable. For example, a cast iron cover with an open top formed by a honeycomb rib structure upstanding from a bottom plate could be used, the open spaces between the ribs being filled in with concrete on site to give the cover the necessary rigidity and strength.
  • the barrier plate 4 may be provided with a pair of straps 48 at its opposite sides which are secured to the top surface of the plate as by screws 49 engaging in elongated slots 50 in the strapso Thereby, the straps 48 can lie flat against the plate 4, as indicated at 48a, or be raised, as shown at 48b, when the plate is to be lifted and removed from the frame 30 Alternatively and preferably each of the straps could have its ends immovably fixed to the top surface of the plate and be curved so as to stand at its centre proud of the plate. Such a strap could be of glass reinforced synthetic plastics material with its ends glassed on to the plate.
  • cover and frame are shown as rectangular in plan view, other configurations are, of course, feasible, and the barrier plate could be shaped to suit.
  • the use of the sealed barrier plate means that covers can be protected against corrosion caused by the pit gases without actually having to either alter their structure or adapt for them a material which is itself not prone to corrosion or provide a coating of that material on the underside of the cover.
  • the barrier plate provides a simple, inexpensive but yet highly effective means of ensuring long life covers.

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)
  • Sewage (AREA)
EP80304044A 1979-12-28 1980-11-12 Couvercles amovibles et châssis correspondants Expired EP0031641B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7944480A GB2066335B (en) 1979-12-28 1979-12-28 Manhole covers
GB7944480 1979-12-28

Publications (3)

Publication Number Publication Date
EP0031641A2 true EP0031641A2 (fr) 1981-07-08
EP0031641A3 EP0031641A3 (en) 1981-09-09
EP0031641B1 EP0031641B1 (fr) 1983-05-18

Family

ID=10510074

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80304044A Expired EP0031641B1 (fr) 1979-12-28 1980-11-12 Couvercles amovibles et châssis correspondants

Country Status (8)

Country Link
EP (1) EP0031641B1 (fr)
KR (1) KR830004504A (fr)
AU (1) AU528746B2 (fr)
BE (1) BE886723A (fr)
DE (1) DE3063373D1 (fr)
FR (1) FR2472632A1 (fr)
GB (1) GB2066335B (fr)
IT (1) IT8026970A0 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2492867A1 (fr) * 1980-10-27 1982-04-30 Dover Eng Works Ltd Procede de fabrication de cadres de couvercle de trou de visite et cadres realises selon ledit procede
FR2559229A1 (fr) * 1984-02-07 1985-08-09 Merlin Gerin Dispositif d'etancheite d'un couvercle
US4662777A (en) * 1983-11-26 1987-05-05 Newton John R Composite article
EP0204278A3 (en) * 1985-06-07 1987-10-28 Hunziker & Cie. Ag Grating for a drainage channel
US4726707A (en) * 1983-11-26 1988-02-23 Newton John R Composite article
ES2179788A1 (es) * 2001-07-02 2003-01-16 Administradora Patrimonial De Tapa para arquetas de registro.
ES2642935A1 (es) * 2016-05-19 2017-11-20 Manufacturas Y Transformados Ab, S.L. Tapa para su uso en vías públicas
CN111779032A (zh) * 2020-07-08 2020-10-16 国网江苏省电力有限公司连云港供电分公司 一种装配式组合八角形电缆井及其建造方法

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2156882A (en) * 1984-04-05 1985-10-16 Stanton & Staveley Ltd Manhole cover
GB2199357B (en) * 1986-12-23 1990-11-07 Brickhouse Dudley Mfg Cover and frame assembly
US6007270A (en) 1993-07-02 1999-12-28 Bowman; Harold M. Manhole frame assembly
US5628152A (en) 1995-08-16 1997-05-13 Bowman; Harold M. Adjustable manhole cover support with shield
DE29608961U1 (de) * 1996-05-18 1996-08-14 Dyckerhoff & Widmann AG, 81902 München Tagwasserdichte Schachtabdeckung
GB2375132A (en) * 2001-05-01 2002-11-06 Stephen Kielty Cover bearing cushion
DE102018120623A1 (de) * 2018-08-23 2020-02-27 ACO Severin Ahlmann GmbH & Co Kommanditgesellschaft Rahmensystem und Schachtabdeckung

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB394036A (en) * 1932-01-08 1933-06-22 Gen Electric Co Ltd Improvements in covers for cable boxes
GB1186860A (en) * 1968-01-04 1970-04-08 Dover Eng Works Ltd Improvements relating to manhole and like covers and frames
IL34132A0 (en) * 1969-04-11 1970-05-21 Downes A Apparatus for temporarily closing an opening formed at the top of vertical walls of a catch basin,manhole or the like
GB1397554A (en) * 1971-08-21 1975-06-11 Herbert E B Manhole covers and frames therefor
GB1484141A (en) * 1974-09-02 1977-08-24 Naka H Floor hatch
GB1571824A (en) * 1977-02-25 1980-07-23 British Steel Corp Manhole assemblies

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2492867A1 (fr) * 1980-10-27 1982-04-30 Dover Eng Works Ltd Procede de fabrication de cadres de couvercle de trou de visite et cadres realises selon ledit procede
EP0050928A1 (fr) * 1980-10-27 1982-05-05 The Dover Engineering Works Limited Fabrication de cadres pour couvercle de trou d'homme
US4662777A (en) * 1983-11-26 1987-05-05 Newton John R Composite article
US4726707A (en) * 1983-11-26 1988-02-23 Newton John R Composite article
FR2559229A1 (fr) * 1984-02-07 1985-08-09 Merlin Gerin Dispositif d'etancheite d'un couvercle
EP0204278A3 (en) * 1985-06-07 1987-10-28 Hunziker & Cie. Ag Grating for a drainage channel
ES2179788A1 (es) * 2001-07-02 2003-01-16 Administradora Patrimonial De Tapa para arquetas de registro.
ES2642935A1 (es) * 2016-05-19 2017-11-20 Manufacturas Y Transformados Ab, S.L. Tapa para su uso en vías públicas
WO2017198888A1 (fr) * 2016-05-19 2017-11-23 Manufacturas Y Transformados Ab, S.L. Couvercle destiné à un usage sur des voies publiques
CN111779032A (zh) * 2020-07-08 2020-10-16 国网江苏省电力有限公司连云港供电分公司 一种装配式组合八角形电缆井及其建造方法

Also Published As

Publication number Publication date
FR2472632A1 (fr) 1981-07-03
GB2066335A (en) 1981-07-08
AU528746B2 (en) 1983-05-12
KR830004504A (ko) 1983-07-13
IT8026970A0 (it) 1980-12-24
AU6450380A (en) 1981-07-02
DE3063373D1 (en) 1983-07-07
BE886723A (fr) 1981-04-16
GB2066335B (en) 1983-06-02
EP0031641B1 (fr) 1983-05-18
EP0031641A3 (en) 1981-09-09

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