WO2008007981A1 - Couvercle d'accès - Google Patents

Couvercle d'accès

Info

Publication number
WO2008007981A1
WO2008007981A1 PCT/NZ2007/000180 NZ2007000180W WO2008007981A1 WO 2008007981 A1 WO2008007981 A1 WO 2008007981A1 NZ 2007000180 W NZ2007000180 W NZ 2007000180W WO 2008007981 A1 WO2008007981 A1 WO 2008007981A1
Authority
WO
WIPO (PCT)
Prior art keywords
structural support
structural
access cover
top plate
load bearing
Prior art date
Application number
PCT/NZ2007/000180
Other languages
English (en)
Inventor
David Edward Hill
Original Assignee
Sika Technology Limited
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 Sika Technology Limited filed Critical Sika Technology Limited
Publication of WO2008007981A1 publication Critical patent/WO2008007981A1/fr

Links

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

Definitions

  • the present invention relates to an access cover and in particular although not solely relates to an access cover to be provided for use in conjunction with a manhole, utility chamber opening or similar opening normally provided in a ground level surface.
  • Access covers are also often called manhole covers and are provided to cover or close an opening. Such an opening may for example be an access hole in a road, foot path, tarmac or the like.
  • An access cover is designed to provide a means of closing the opening when access through the opening is not necessary or undesirable.
  • the access cover can be removed from the opening to thereby allow for the opening to provide access there through and into the below ground located regions.
  • Such below ground regions may contain utilities such as for example sewage pipes, storm pipes, telecommunication pipes and connections, underground passage ways, gas connections, electrical conduits and the like. Such utilities are often contained in a below ground utility chamber and the access cover closes the opening to the utility chamber.
  • Access covers may also be provided in the form of grates which provide a restricted degree of closure to an in ground opening.
  • access covers are provided in regions where significant loading is likely to be experienced, the access covers need to have consideration strength to ensure that the cover remains intact and undamaged when loading acts onto it.
  • some access covers are provided in road ways, footpaths, runways and taxiways. They therefore need to be of sufficient strength to not failure under high repeat loading of cars, trucks, aircraft and other heavy equipment.
  • the present invention may be said to broadly consist in a load bearing access cover, assembly or components thereof, to at least in part close an opening comprising or including, a unitary cast structural support providing member (hereinafter "structural support”) defining an upper side and a lower side comprising, a) a lattice of structural webs defining a plurality of interstices, wherein at least some interstices are open to both said upper and lower sides, and b) a frame portion at least in part surround a periphery of said lattice, said frame portion connecting between at least some of said structural webs, and a top plate engaged, or engageable, to said structural support providing member from above, said top plate being at least substantially coextensive with said structural support, wherein said structural support and said top plate are engaged or engageable to form a unitary load bearing structure.
  • structural support unitary cast structural support providing member
  • said structural support is generally of a slender thickness (between said upper and lower sides) planar profile.
  • said top plate locates to the upper side of and parallel to said planar profile of said structural support.
  • said load bearing access cover is adapted in use to engage a surrounding or perimeter frame.
  • said frame portion engages in use said surrounding or perimeter frame.
  • said at least some of said interstices are at least in part bounded by an at least in part surrounding flange running between bounding said structural webs.
  • said structural support is at least predominantly of aluminium.
  • said structural support providing member is aluminium.
  • said structural support providing member is cast as a unitary item.
  • said structural support providing member is die cast.
  • said plate is aluminium.
  • said top plate is an aluminium alloy.
  • said plate is affixed to said structural support providing member.
  • said plate is welded to said structural support providing member.
  • said plate includes a major side facing said structural support providing member, and on said major side there are means to locate with at least some of said structural webs.
  • said means to locate are lugs or flanges upstanding from the major surface of said top plate and abut either side of said structural webs of said structural support providing member.
  • said top plate is engaged to said structural support by any one or more of: a) Welding, b) Threaded or similar fastening, c) Adhesives, or d) any combination thereof.
  • said plate is a tread plate and said cover is for use to engage with an in-ground access opening.
  • said top plate includes, on its upper presenting major surface, a tread or grip enhancing pattern.
  • said in-ground access opening is a manhole.
  • said access cover has locking means to releasably engage with a surrounding or perimeter frame of in-ground access opening.
  • said structural support providing member includes a frame web extending generally in a direction lateral to the planar direction of said structural support providing member.
  • said frame portion is continuous about the periphery of said lattice of structural webs.
  • said structural webs include a first plurality of structural webs extending in a first direction and a second plurality of structural webs extending in a second direction, perpendicular to said first plurality , both said first and second pluralities extending between inner edges of said frame portion.
  • said structural support is circular in shape having radial webs.
  • first direction extending structural webs extend lateral to the second direction extending structural webs.
  • surrounding flange is disposed more to the lower side of said structural webs.
  • interstices are located between at least two adjacent first direction extending structural webs are at least in part bounded by a said closure flange.
  • interstices are ones not bounded by said framed perimeter.
  • interstices are ones centrally extending across said structural support providing member.
  • interstices between at least two second direction extending structural webs are at least in part bounded by a closure flange.
  • interstices are ones not bounded by said framed perimeter.
  • interstices are ones centrally extending across said structural support providing member.
  • interstices are bounded by said closure flange.
  • said access cover in plan form is square, rectangular, or of other multisided polygonal shape, including triangular and circular.
  • said structural support is circular in shape having radial webs.
  • the present invention consists in a method of forming a load bearing access cover, assembly or components thereof, said load bearing access cover to at least in part close an opening, comprising or including the steps of, a) providing, a unitary cast structural support providing member
  • structural support defining an upper side and a lower side including, i) a lattice of structural webs defining a plurality of interstices, wherein at least some interstices are open to both said upper and lower sides, and ii) a frame portion at least in part surrounding a periphery of said lattice, said frame portion connecting between at least some of said structural webs, and b) engaging a top plate to said structural support providing member from above, said top plate being at least substantially coextensive with said structural support, to form a unitary load bearing structure.
  • said top plate is engaged to said structural support by any one or more of: a) Welding b) Threaded or similar fastening, c) Adhesives, or d) any combination thereof.
  • top plate is engaged to said structural surround by welding.
  • top plate locates to the upper side of and parallel to a planar profile of said structural support.
  • said at least some of said interstices are at least in part bounded by an at least in part surrounding flange running between bounding said structural webs.
  • At least said structural support is at least predominandy of aluminium.
  • said structural support providing member is cast as a unitary item.
  • said top plate is aluminium.
  • said top plate includes a major side facing said structural support providing member, and on said major side there are means to locate with at least some of said structural webs.
  • said means to locate are lugs or flanges upstanding from the major surface of said top plate and abut either side of said structural webs of said structural support providing member.
  • said top plate includes, on its upper presenting major surface, a tread or grip enhancing pattern.
  • said method includes the step of locating locking means at least in part in said access cover releasably engage with a surrounding or perimeter frame of an in-ground access opening.
  • said access cover in plan form is square ⁇ rectangular, or of other multisided polygonal shape, including triangular and circular.
  • the present invention consists in an in situ opening cover located in or on the ground and engaged with a complementary perimeter frame, said opening cover comprising or including, a) a lattice of structural webs defining a plurality of interstices, wherein at last some interstices are open to both said upper and lower sides, and b) a frame portion at least in part surrounding a periphery of said lattice, said frame portion connecting between at least some of said structural webs, and a top plate engaged to the upper side of said structural support providing member, said plate being of a perimeter commensurate with a perimeter of said structural support, wherein said structural support and said top plate are engaged or able to be engaged to form a unitary load bearing structure.
  • said perimeter frame may be permanently located with and about ground level opening.
  • said perimeter frame is made of aluminium.
  • the present invention consists of a method of making an access cover as defined above without the use of sand casting.
  • the present invention consists of a load bearing access cover as herein described with reference to any one or more of the accompany drawings.
  • said access cover is made by die casting.
  • This invention may also be said broadly to consist in the parts, elements and features referred to or indicated in the specification of the application, individually or collectively, and any or all combinations of any two or more of said parts, elements or features, and where specific integers are mentioned herein which have known equivalents in the art to which this invention relates, such known equivalents are deemed to be incorporated herein as if individually set forth.
  • Figure 1 is a perspective top view of a plate forming part of the top cover of the present invention
  • Figure 2 is a perspective top view of the structural support for the top cover
  • Figure 3 is a perspective bottom view of the access cover frame that the access cover can fit
  • Figure 4 is a perspective top view of Figure 3
  • Figure 5 is a perspective bottom view of the structural support of Figure 2
  • Figure 6 is a perspective bottom view of the top cover of Figure 1
  • Figure 7 is a plan view of a further embodiment cover of the present invention.
  • Figure 8 is a plan view of a further embodiment cover of the present invention
  • Figure 9 is a sectional view through section AA of Figure 7 showing a cover engaged with a frame engaged to the ground to provide closure to an access opening in the ground
  • Figure 10 is a plan view of yet a further embodiment of an access cover according to the present invention
  • Figure 11 is a perspective view of an access cover fully assembled
  • Figure 12 is perspective view of the bottom of the access cover fully assembled as shown in Figure 11
  • Figure 13 shows in bottom perspective view a further embodiment wherein complementary structural webs extend from the top plate also to engage with structural webs on the structural support , and
  • Figure 14 shows a similar view to Figure 13 in section view along cutting plane AA.
  • Figure 1 illustrates a top plate 1 to form part of the access cover of the present invention.
  • the top plate 1 is preferably of a thickness which is relatively thin and of a perimeter shape which is substantially commensurate with the plan view of the final assembled access cover assembly.
  • the top plate 1 is for example of a quadrilateral shape but may alternatively be of anyi-number of sides: Shown also is a circular shape where it is to be used in a manner to provide a circular closure to an opening in the ground.
  • the top plate 1 is preferably made from an aluminium material such as an aluminium alloy but may alternatively be made from a steel material such as a cast iron steel or rolled steel. However to take advantage of reduced weight of the overall assembly of the access cover of the present invention, aluminium is preferred.
  • the top plate 1 is to engage with a structural support 2.
  • the structural support 2 is made from aluminium such as a castable aluminium alloy. In this embodiment the join between the top plate 1 and the structural support 2 is toward the upper surface of the assembly of the two.
  • the top plate 1 may have structural webs 5' and 6' extending from its underside complimentary to those 5 and 6 extending up from die structural support 2.
  • the join line is no longer at the upper surface of the assembly but may be towards the middle of the resultant assembly of the top plate 1 and structural support 2. The attachment of the two may still be by methods as herein described.
  • the structural support 2 is die cast in a mould.
  • the particular construction of the structural support 2 is such that it can be released from the die cast mould by a two part separation of the mould in which the structural support 2 is cast.
  • the configuration of the structural support includes no undercut or recessed features which, as will be appreciated by a person skilled in moulding technology would result in much more complex moulding equipment needing to be utilised.
  • the structural support 2 of die present invention is able to be released from a two part separation of a die cast mould.
  • the structural support 2 includes a frame portion 3 which preferably extends continuously to define a framed perimeter of the structural support 2.
  • the frame portion 3 is preferably a flange which extends in a direction parallel to the load direction to be received on top of the access cover or top plate 1. As such the frame portion 3 extends substantially in a direction parallel to the normal of the top plate 1.
  • the frame portion 3 is substantially circular in shape to define the frame to the structural support 2 of such a circular cover. Whilst the frame portion 3 is preferably continuous it need not be of a constant cross sectional shape or be continuous to define a fully framed perimeter of the structural support 2. In some instances also it may have a tapered dross section that has reduced thickness from top to bottom Extending inwardly from the frame portion 3 is a plurality of structural webs
  • the lateral and longitudinal webs 5, 6 preferably extend at 90 degrees to each other to create a lattice like structure. In the configuration as shown in Figures 2 and 5, there are two longitudinal webs and 6 transverse webs.
  • the number of webs will vary depending on the required load rating of the access cover.
  • each of the interstices 7 may be have an opening from top side to bottom side of the structural support 2. However at least a selection of the interstices 7 are partially enclosed by a closure flange 8. In the most preferred form there is an array of interstices 7 which extend between opposed edges of the frame portion 3 which are at least in part bounded by a closure flange 8.
  • array A of the structural support 2 defined between the two longitudinal webs 6 are partially enclosed by the closure flanges 8.
  • three arrays B, C, D extending between adjacent lateral webs 5 include such closure flanges 8 extending from side to side of the frame portion 3.
  • closure flanges 8 extending substantially across all or at least most of both the width and the length of the structural support will enhance the structural rigidity of the structural support 2 as far as the bending moment of the structural support 2 is concerned. Even with the inclusion of the closure flanges 8, there is still no undercutting occurring to the structural support. As such a two part mould release can still be conveniently achieved for a structural support 2 as shown in Figures 2 and 5.
  • the webs 5, 6 preferably extend also in a direction substantially normal to the plate 1 and the closure flanges 8 extend substantially parallel to or possibly at a slight angle to the plane of the plate 1.
  • closure flanges do not provide a complete closure to the interstices. It can be seen that the closure flanges still include an opening 12 but there is sufficient size in the closure flanges to be able to enhance the bending moment of the structural support.
  • the top plate 1 subsequent to the forming of the unitary cast structural support 2, engaged to the upper side of the structural support 2.
  • the engaging surface 10, in this case the lower surface of the top plate 1 may include locating features 13 where it mates to the top plate 1 which can engage with the upper edges of the webs 5, 6.
  • the locating features 13 are channels to accept the upper edges of the webs 5 and 6.
  • the top plate 1 can then be attached to the structural support 2 or otherwise fastened thereto to create a cover assembly 14.
  • the attaching of the top plate 1 to the structural support 2 can be by welding, fasteners (whether threaded or otherwise, eg rivets), adhesives or any combination of these.
  • the top plate 1 is welded to the structural support 2.
  • the openings 12 of the closure flanges 8 still allow for access to be obtained to the mating surface of the top plate 1 and the webs 5, 6 for the purposes of such welding
  • the perimeter frame can be permanently or semi-permanently affixed to or in the ground or material located in the ground, e.g. a concrete surround frame or capping.
  • the resulting cover in aluminium measuring 1200mm x 600mm weighs 38 kg and has a rating of 210 kN.
  • the weight saving of the present invention can therefore be seen.
  • Locks 11 or apertures for locks may be present to fasten the access cover 14 to the perimeter frame 15 may be provided.
  • the perimeter frame 15 allows for the cover 14 to engage therewith and preferably sit flush with the upper surface 16 of the surrounding ground, road or footpath, or capping with which the cover is to provide a closure to the utility chamber 17 or similar below, access opening 17.

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)

Abstract

L'invention concerne un couvercle d'accès portant, un ensemble ou des composants de celui-ci, destiné à fermer une ouverture, par exemple une chambre utilitaire de terre ou analogue. Le couvercle d'accès comprend un support structurel moulé en une seule pièce qui définit un côté supérieur et un côté inférieur. Le support structurel comporte un réseau de bandes structurelles définissant plusieurs interstices; au moins certaines de ces interstices sont ouvertes aux côtés supérieur et inférieur. Le support structurel comprend également une partie de cadre encadrant au moins en partie la périphérie du réseau. La partie de cadre est connectée entre au moins certaines bandes structurelles. Une plaque supérieure est au moins co-extensible avec le support structurel. Ce support et la plaque supérieure sont couplés ou peuvent être couplés afin de former une structure support à charge unitaire.
PCT/NZ2007/000180 2006-07-12 2007-07-12 Couvercle d'accès WO2008007981A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NZ54848706A NZ548487A (en) 2006-07-12 2006-07-12 Access cover
NZ548487 2006-07-12

Publications (1)

Publication Number Publication Date
WO2008007981A1 true WO2008007981A1 (fr) 2008-01-17

Family

ID=38923467

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NZ2007/000180 WO2008007981A1 (fr) 2006-07-12 2007-07-12 Couvercle d'accès

Country Status (2)

Country Link
NZ (1) NZ548487A (fr)
WO (1) WO2008007981A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2113609A3 (fr) * 2008-04-30 2009-11-18 Hailo-Werk Rudolf Loh GmbH & Co. KG Couvercle pour regard chaussée
ES2602231A1 (es) * 2015-08-20 2017-02-20 Pere JULIÀ DORCA Cerramientos estancos y herméticos con tapas intercambiables, fabricados mediante el proceso de fundido de metal
DE102020120203A1 (de) 2020-07-30 2022-02-03 FAUDI Aviation GmbH Hydrantendeckel

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2194221A (en) * 1936-03-27 1940-03-19 Elkington Vivian Manhole cover and frame
US5529431A (en) * 1995-02-24 1996-06-25 Alfred T. Francis Temporary manhole cover and method
AU2355799A (en) * 1998-04-03 1999-10-14 Farnell & Thomas Limited Improved access cover support frame and members

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2194221A (en) * 1936-03-27 1940-03-19 Elkington Vivian Manhole cover and frame
US5529431A (en) * 1995-02-24 1996-06-25 Alfred T. Francis Temporary manhole cover and method
AU2355799A (en) * 1998-04-03 1999-10-14 Farnell & Thomas Limited Improved access cover support frame and members

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2113609A3 (fr) * 2008-04-30 2009-11-18 Hailo-Werk Rudolf Loh GmbH & Co. KG Couvercle pour regard chaussée
ES2602231A1 (es) * 2015-08-20 2017-02-20 Pere JULIÀ DORCA Cerramientos estancos y herméticos con tapas intercambiables, fabricados mediante el proceso de fundido de metal
DE102020120203A1 (de) 2020-07-30 2022-02-03 FAUDI Aviation GmbH Hydrantendeckel
DE102020120203B4 (de) 2020-07-30 2022-09-22 FAUDI Aviation GmbH Hydrantendeckel

Also Published As

Publication number Publication date
NZ548487A (en) 2008-10-31

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