EP1690987A1 - Cover for a drainage device or a manhole - Google Patents

Cover for a drainage device or a manhole Download PDF

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Publication number
EP1690987A1
EP1690987A1 EP05020908A EP05020908A EP1690987A1 EP 1690987 A1 EP1690987 A1 EP 1690987A1 EP 05020908 A EP05020908 A EP 05020908A EP 05020908 A EP05020908 A EP 05020908A EP 1690987 A1 EP1690987 A1 EP 1690987A1
Authority
EP
European Patent Office
Prior art keywords
cover
weighting means
natural stone
manhole
cover according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP05020908A
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German (de)
French (fr)
Inventor
Wilfried Neuber
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.)
Hydrotec Technologies & Co KG GmbH
Original Assignee
Hydrotec Technologies & Co KG GmbH
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 Hydrotec Technologies & Co KG GmbH filed Critical Hydrotec Technologies & Co KG GmbH
Publication of EP1690987A1 publication Critical patent/EP1690987A1/en
Withdrawn legal-status Critical Current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

Definitions

  • the invention relates to a cover of a drainage device or a shaft structure, in particular cover of a manhole cover, with a body and at least one weighting means disposed on the body. Furthermore, the invention relates to a drainage device or a shaft structure with such a cover.
  • Covers of the type mentioned are known and are widely used to cover a drainage device and to close. Such a cover is mainly intended for ventilation of manholes and pipe systems and therefore has corresponding openings. Usually, the cover rests on a frame which, like the cover, also forms part of the drainage device.
  • a drainage device or a manhole structure in particular covers of a manhole cover, with a body and at least one weighting means arranged on the body, characterized in that the weighting means comprises natural stone.
  • the weighting means comprises natural stone or consists of natural stone.
  • the invention makes use of the knowledge that natural stone not only has a particularly high specific gravity, but is also particularly weather-resistant, robust and low-wear. Due to its weather resistance, natural stone does not change its appearance, so that the visual impression of the cover remains unchanged over a very long time. Finally, natural stone can be obtained particularly cheaply, at least in certain areas, whereby the cost of coverage can be kept low.
  • the weighting means consists of a preferably plate-shaped and preferably mechanically machined or laser or high pressure water cut natural stone block, whereby a particularly simple use as weighting means can be realized.
  • the natural stone used should be granite and / or marble, since these two types of stone are characterized by a particular robustness and good appearance.
  • the weighting means is adhered to the body, resulting in a particularly simple attachment.
  • the body has a, preferably tub-shaped, receptacle in which the weighting means is arranged.
  • This design provides a particularly safe and at the same time inconspicuous possibility of the arrangement of the weighting means.
  • the weighting means should be designed and arranged on the body such that the surface of the weighting means in the installed in a traffic surface state of Entskysser mecanicseinrichrung or the shaft structure substantially with the traffic surface.
  • a circular disk-shaped cover 2 is shown for a manhole cover, not shown.
  • the lid 2 has a body 4, which is usually made of cast iron.
  • the cover 2 is placed on a frame, not shown, of the manhole cover so that the surface 4a of the body 4 is aligned with the traffic surface also not shown in the figures, in which the manhole cover is inserted.
  • the body 4 is provided with a flange-like edge 4b, with which the body 4 rests on an annular circumferential bearing surface on the frame of the manhole cover in the closed state.
  • Adjacent to the flange-like edge 4b, the body 4 of the lid 2 is provided on the inside with ventilation openings 6, which allow a ventilation.
  • the body 4 has a concentric trough section 8, which forms a depression towards the surface 4a of the body 4 and is open towards the top.
  • This trough-shaped trough portion 8 receives a plate-shaped block of natural stone 10, which serves as a weighting agent due to its high specific gravity and preferably consists of granite or marble.
  • the natural stone 10 has in the illustrated embodiment a disc shape that is complementary to the shape of the trough-shaped portion 8 is formed.
  • the natural stone 10 completely fills the trough-shaped section 8, the surface 10 a of the natural stone block 10 being flush with the surface 4 a of the body 4.
  • the natural stone block 10 is extracted from recovered natural stone, in particular by laser or high-pressure water, and / or sawed and reworked by means of grinding, in particular on its surface 10a.
  • the thus completed natural stone block 10 is placed in the upwardly open trough-shaped portion 8 of the body 4 and preferably adhered to a secure locking on the inside of the trough-shaped section 8.
  • other types of attachment of the natural stone block 10 on the trough-shaped portion 8 are conceivable.

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  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Underground Structures, Protecting, Testing And Restoring Foundations (AREA)

Abstract

The cover has a body (4) with a tub shaped admission in which a loading component (10) is arranged, where the component has a natural stone. The component is arranged and formed at the body in such a manner that the surface of the component aligns with a contact surface. The body is provided with a rim with which the body is rest on a ring shaped supporting surface and with ventilation openings. An independent claim is also included for a drainage mechanism and/or a manhole construction with a cover.

Description

Die Erfindung betrifft eine Abdeckung einer Entwässerungseinrichtung oder eines Schachtbauwerkes, insbesondere Deckel einer Schachtabdeckung, mit einem Körper und mindestens einem am Körper angeordneten Beschwerungsmittel. Femer betrifft die Erfindung eine Entwässerungseinrichtung oder ein Schachtbauwerk mit einer solchen Abdeckung.The invention relates to a cover of a drainage device or a shaft structure, in particular cover of a manhole cover, with a body and at least one weighting means disposed on the body. Furthermore, the invention relates to a drainage device or a shaft structure with such a cover.

Abdeckungen der eingangs genannten Art sind bekannt und befinden sich vielfältig im Einsatz, um eine Entwässerungseinrichtung abzudecken und zu verschließen. Eine solche Abdeckung ist hauptsächlich zur Be- und Entlüftung von Schächten und Rohrsystemen vorgesehen und weist deshalb entsprechende Öffnungen auf. Gewöhnlich liegt die Abdeckung auf einem Rahmen auf, der ebenfalls wie die Abdeckung einen Bestandteil der Entwässerungseinrichtung bildet.Covers of the type mentioned are known and are widely used to cover a drainage device and to close. Such a cover is mainly intended for ventilation of manholes and pipe systems and therefore has corresponding openings. Usually, the cover rests on a frame which, like the cover, also forms part of the drainage device.

Um eine feste und stabile sowie verwacklungssichere Auflage der Abdeckung zu gewährleisten, ist in Abhängigkeit von ihrem Einsatzzweck bei bestimmten Abdeckungen an deren Körper ein Beschwerungsmittel vorgesehen bzw. angeordnet. Insbesondere für den Deckel einer Schschtabdeckung wird gewöhnlich als Beschwerungsmittel Beton verwendet. Beton besitzt jedoch die nachteilige Eigenschaft, aufgrund von Witterungseinflüssen, denen die Abdeckung regelmäßig ausgesetzt ist, im Laufe der Zeit zu verschleißen, wodurch nicht nur dessen optischer Eindruck, sondem auch dessen Zusammensetzung und Festigkeit leidet.In order to ensure a firm and stable and anti-shaking overlay of the cover, depending on its application in certain covers on the body of a weighting means provided or arranged. In particular, for the cover of a Schschtabdeckung is usually used as a weighting concrete. However, concrete has the disadvantageous property of being worn over time due to weather conditions to which the cover is exposed on a regular basis, which suffers not only its visual appearance but also its composition and strength.

Es ist Aufgabe der vorliegenden Erfindung, für eine Abdeckung der eingangs genannten Art ein Beschwerungsmittel vorzuschlagen, das gegenüber Witterungseinflüssen weitgehend resistent ist.It is an object of the present invention to provide for a cover of the type mentioned a weighting agent, which is largely resistant to weathering.

Zur Lösung dieser Aufgabe wird vorgeschlagen eine Abdeckung einer Entwässerungseinrichtung oder eine Schachtbauwerkes, insbesondere Deckel einer Schachtabdeckung, mit einem Körper und mindestens einem am Körper angeordneten Beschwerungsmittel, dadurch gekennzeichnet, dass das Beschwerungsmittel Naturstein aufweist.To solve this problem, it is proposed to cover a drainage device or a manhole structure, in particular covers of a manhole cover, with a body and at least one weighting means arranged on the body, characterized in that the weighting means comprises natural stone.

Demnach weist efindungsgemäß das Beschwerungsmittel Naturstein auf oder besteht aus Naturstein. Dabei macht sich die Erfindung die Erkenntnis zu Nutze, dass Naturstein nicht nur ein besonders hohes spezifisches Gewicht besitzt, sondern auch besonders witterungsfest, robust und verschleißarm ist. Aufgrund seiner Witterungsbeständigkeit verändert Naturstein auch nicht sein Aussehen, so dass der optische Eindruck der Abdeckung über sehr lange Zeit unverändert erhalten bleibt. Schließlich lässt sich Naturstein zumindest in bestimmten Gegenden besonders günstig gewinnen, wodurch die Kosten der Abdeckung niedrig gehalten werden können.Accordingly, according to the invention the weighting means comprises natural stone or consists of natural stone. The invention makes use of the knowledge that natural stone not only has a particularly high specific gravity, but is also particularly weather-resistant, robust and low-wear. Due to its weather resistance, natural stone does not change its appearance, so that the visual impression of the cover remains unchanged over a very long time. Finally, natural stone can be obtained particularly cheaply, at least in certain areas, whereby the cost of coverage can be kept low.

Bevorzugte Ausführungen und Weiterbildungen sind in den abhängigen Ansprüchen angegeben.Preferred embodiments and further developments are specified in the dependent claims.

Zweckmäßigerweise besteht das Beschwerungsmittel aus einem, vorzugsweise plattenförmigen sowie vorzugsweise mechanisch bearbeiteten oder laser- oder hochdruckwassergeschnittenen Natursteinblock, wodurch sich eine besonders einfache Verwendung als Beschwerungsmittel realisieren lässt.Conveniently, the weighting means consists of a preferably plate-shaped and preferably mechanically machined or laser or high pressure water cut natural stone block, whereby a particularly simple use as weighting means can be realized.

Vorzugsweise sollte es sich bei dem verwendeten Naturstein um Granit und/oder Marmor handeln, da sich diese beiden Steinarten durch eine besondere Robustheit und gutes Aussehen auszeichnen.Preferably, the natural stone used should be granite and / or marble, since these two types of stone are characterized by a particular robustness and good appearance.

Zweckmäßigerweise ist das Beschwerungsmittel am Körper angeklebt, wodurch sich eine besonders einfache Befestigung ergibt.Appropriately, the weighting means is adhered to the body, resulting in a particularly simple attachment.

Bei einer weiteren bevorzugten Ausführung weist der Körper eine, vorzugsweise wannenförmige, Aufnahme auf, in der das Beschwerungsmittel angeordnet ist. Diese Konstruktion bietet eine besonders sichere und zugleich unauffällige Möglichkeit der Anordnung des Beschwerungsmittels.In a further preferred embodiment, the body has a, preferably tub-shaped, receptacle in which the weighting means is arranged. This design provides a particularly safe and at the same time inconspicuous possibility of the arrangement of the weighting means.

Vorzugsweise sollte das Beschwerungsmittel so ausgebildet und am Körper derart angeordnet sein, dass die Oberfläche des Beschwerungsmittels im in einer Verkehrsfläche eingebauten Zustand der Entwässerungseinrichrung oder des Schachtbauwerkes im wesentlichen mit der Verkehrsfläche fluchtel.Preferably, the weighting means should be designed and arranged on the body such that the surface of the weighting means in the installed in a traffic surface state of Entwässererungseinrichrung or the shaft structure substantially with the traffic surface.

Nachfolgend wird ein bevorzugtes Ausführungsbeispiel der Erfindung anhand der beiliegenden Zeichnungen näher erläutert. Es zeigen:

Figur 1
im Querschnitt eine bevorzugte Ausführung des Deckels einer Schachtabdeckung; und
Figur 2
in Draufsicht den Deckel von Figur 1.
Hereinafter, a preferred embodiment of the invention will be explained in more detail with reference to the accompanying drawings. Show it:
FIG. 1
in cross-section, a preferred embodiment of the cover of a manhole cover; and
FIG. 2
in plan view, the lid of Figure 1.

In den Figuren ist ein kreisscheibenförmiger Deckel 2 für eine nicht näher dargestellte Schachtabdeckung gezeigt. Der Deckel 2 weist einen Körper 4 auf, der gewöhnlich aus Gusseisen besteht. Der Deckel 2 ist auf einen nicht dargestellten Rahmen der Schachtabdeckung so aufsetzbar, dass die Oberfläche 4a des Körpers 4 mit der in den Figuren ebenfalls nicht dargestellten Verkehrsfläche fluchtet, in die die Schachtabdeckung eingesetzt ist. Entlang seines Umfanges ist der Körper 4 mit einem flanschartigen Rand 4b versehen, mit dem der Körper 4 auf eine ringförmig umlaufende Lagerfläche am Rahmen der Schachtabdeckung im geschlossenen Zustand aufliegt. Benachbart zum flanschartigen Rand 4b ist der Körper 4 des Deckels 2 innenseitig mit Belüftungsöffnungen 6 versehen, die eine Be- und Entlüftung ermöglichen.In the figures, a circular disk-shaped cover 2 is shown for a manhole cover, not shown. The lid 2 has a body 4, which is usually made of cast iron. The cover 2 is placed on a frame, not shown, of the manhole cover so that the surface 4a of the body 4 is aligned with the traffic surface also not shown in the figures, in which the manhole cover is inserted. Along its circumference, the body 4 is provided with a flange-like edge 4b, with which the body 4 rests on an annular circumferential bearing surface on the frame of the manhole cover in the closed state. Adjacent to the flange-like edge 4b, the body 4 of the lid 2 is provided on the inside with ventilation openings 6, which allow a ventilation.

Wie insbesondere Figur 1 femer erkennen lässt, weist der Körper 4 einen konzentrischen Wannenabschnitt 8 auf, der gegenüber der Oberfläche 4a des Körpers 4 eine Vertiefung nach unten bildet und nach oben offen ist. Dieser wannenförmige Wannenabschnitt 8 nimmt einen plattenförmigen Natursteinblock 10 auf, der aufgrund seines hohen spezifischen Gewichtes als Beschwerungsmittel dient und vorzugsweise aus Granit oder Marmor besteht. Der Naturstein 10 hat in der dargestellten Ausführung eine Scheibenform, die komplementär zur Form des wannenförmigen Abschnittes 8 gebildet ist. Somit füllt im dargestellten Ausführungsbeispiel der Naturstein 10 den wannenförmigen Abschnitt 8 vollständig aus, wobei die Oberfläche 10a des Natursteinblockes 10 mit der Oberfläche 4a des Körpers 4 fluchtet.As can also be seen in particular from FIG. 1, the body 4 has a concentric trough section 8, which forms a depression towards the surface 4a of the body 4 and is open towards the top. This trough-shaped trough portion 8 receives a plate-shaped block of natural stone 10, which serves as a weighting agent due to its high specific gravity and preferably consists of granite or marble. The natural stone 10 has in the illustrated embodiment a disc shape that is complementary to the shape of the trough-shaped portion 8 is formed. Thus, in the illustrated embodiment, the natural stone 10 completely fills the trough-shaped section 8, the surface 10 a of the natural stone block 10 being flush with the surface 4 a of the body 4.

Gewöhnlich wird der Natursteinblock 10 aus gewonnenem Naturstein, insbesondere durch Laser oder Hochdruckwasser, herausgeschnitten und/oder - gesägt und mittels Schleifen, insbesondere an dessen Oberfläche 10a, nachbearbeitet. Bei der Herstellung des Deckels 2 wird der so fertiggestellte Natursteinblock 10 in den nach oben offenen wannenförmigen Abschnitt 8 des Körpers 4 gelegt und für eine sichere Arretierung vorzugsweise an der Innenseite des wannenförmigen Abschnittes 8 angeklebt. Selbstverständlich sind aber auch andere Arten der Befestigung des Natursteinblockes 10 am wannenförmigen Abschnitt 8 denkbar.Usually, the natural stone block 10 is extracted from recovered natural stone, in particular by laser or high-pressure water, and / or sawed and reworked by means of grinding, in particular on its surface 10a. In the production of the cover 2, the thus completed natural stone block 10 is placed in the upwardly open trough-shaped portion 8 of the body 4 and preferably adhered to a secure locking on the inside of the trough-shaped section 8. Of course, other types of attachment of the natural stone block 10 on the trough-shaped portion 8 are conceivable.

Schließlich sei an dieser Stelle der guten Vollständigkeit halber noch angemerkt, dass die zuvor beschriebene Konstruktion und die Verwendung eines Natursteinblockes als Beschwerungsmittel auch an Deckeln und Abdeckungen mit anderen Formen und für andere Arten von Entwässerungseinrichtungen wie z. B. Entwässerungsrinnen oder auch für Schachtbauwerke realisiert werden können und somit nicht auf die zuvor beschriebene konzentrische Schachtabdeckung beschränkt ist. In diesem Zusammenhang kann der Natursteinblock auch eine andere Form als die in den Figuren dargestellte Plattenform aufweisen.Finally, it should be noted at this point for the sake of completeness, that the construction described above and the use of a natural stone block as weighting means on lids and covers with other shapes and for other types of drainage devices such. As drainage channels or for manhole structures can be realized and thus is not limited to the concentric manhole cover described above. In this context, the natural stone block may also have a different shape than the plate shape shown in the figures.

Claims (7)

Abdeckung einer Entwässerungseinrichtung oder eines Schachtbauwerkes, insbesondere Deckel einer Schachtabdeckung, mit einem Körper (4) und mindestens einem am Körper (4) angeordneten Beschwerungsmittel (10),
dadurch gekennzeichnet, dass das Beschwerungsmittel (10) Naturstein aufweist.Covering a drainage device or a manhole structure, in particular cover of a manhole cover, with a body (4) and at least one weighting means (10) arranged on the body (4),
characterized in that the weighting means (10) comprises natural stone. Abdeckung nach Anspruch 1,
dadurch gekennzeichnet, dass das Beschwerungsmittel aus einem, vorzugsweise plattenförmigen sowie vorzugsweise mechanisch bearbeiteten oder geschnittenen, Natursteinblock (10) besteht.Cover according to claim 1,
characterized in that the weighting means consists of a, preferably plate-shaped and preferably mechanically machined or cut, natural stone block (10). Abdeckung nach Anspruch 1 oder 2,
dadurch gekennzeichnet, dass es sich bei dem Naturstein um Granit und/oder Marmor handelt.Cover according to claim 1 or 2,
characterized in that it is the natural stone is granite and / or marble. Abdeckung nach mindestens einem der vorangegangenen Ansprüche,
dadurch gekennzeichnet, dass das Beschwerungsmittel (10) am Körper (4) angeklebt ist.Cover according to at least one of the preceding claims,
characterized in that the weighting means (10) is adhered to the body (4). Abdeckung nach mindestens einem der vorangegangenen Ansprüche,
dadurch gekennzeichnet, dass der Körper (4) eine, vorzugsweise wannenförmige, Aufnahme (8) aufweist, in der das Beschwerungsmittel (10) angeordnet ist.Cover according to at least one of the preceding claims,
characterized in that the body (4) has a, preferably trough-shaped receptacle (8) in which the weighting means (10) is arranged. Abdeckung nach mindestens einem der vorangegangenen Ansprüche,
dadurch gekennzeichnet, dass das Beschwerungsmittel (10) so ausgebildet und am Körper (4) derart angeordnet ist, dass die Oberfläche (10a) des Beschwerungsmittels im in einer Verkehrsfläche eingebauten Zustand der Entwässerungseinrichtung oder des Schachtbauwerkes im wesentlichen mit der Verkehrsfläche fluchtet.Cover according to at least one of the preceding claims,
characterized in that the weighting means (10) is formed and disposed on the body (4) such that the surface (10a) of the weighting means is substantially flush with the traffic area in the dewatering device or manhole structure installed in a traffic area. Entwässerungseinrichtung oder Schachtbauwerk mit einer Abdeckung nach mindestens einem der vorangegangenen Ansprüche.Drainage device or shaft structure with a cover according to at least one of the preceding claims.
EP05020908A 2004-10-06 2005-09-26 Cover for a drainage device or a manhole Withdrawn EP1690987A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200420015574 DE202004015574U1 (en) 2004-10-06 2004-10-06 Covering a drainage facility or a shaft structure

Publications (1)

Publication Number Publication Date
EP1690987A1 true EP1690987A1 (en) 2006-08-16

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ID=35510991

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05020908A Withdrawn EP1690987A1 (en) 2004-10-06 2005-09-26 Cover for a drainage device or a manhole

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EP (1) EP1690987A1 (en)
DE (1) DE202004015574U1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7588392B2 (en) 2006-04-24 2009-09-15 Zurn Industries, Llc Removable grate
DE202020101621U1 (en) 2020-03-26 2020-05-07 Hans-Jürgen Trauthwein Manhole cover for a manhole cover of a sewage rainwater sewer and manhole cover

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE454014C (en) * 1927-12-22 Franz Sengbusch Manhole cover filling
DE1956898U (en) * 1967-01-04 1967-03-09 Streicher Fa M MANHOLE COVER WITH FRAME AND LID.
EP0287798A1 (en) * 1987-03-25 1988-10-26 Silo Verfahrens AG Covering for large-diameter receptacles and welding device for the production of metal sheets for such a covering
CH674034A5 (en) * 1987-03-17 1990-04-30 Cewag Duedingen Tree trunk base surrounding slab - comprises concrete or stone panels with recesses for trunk and air circulation-water drain holes
GB2243177A (en) * 1990-04-17 1991-10-23 Frederick Jones And Son Support for an access cover
EP0631015A1 (en) * 1993-06-25 1994-12-28 TONCELLI, Marcello Reinforced product consisting of a slab of natural stone or conglomerate material
JPH09296467A (en) * 1996-05-08 1997-11-18 Kawasaki Tetsumou Kk Pit cover
DE19617747A1 (en) * 1996-05-03 1998-07-02 Hans Juergen Koegler Frame for groups of paving stones laid on ground

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE454014C (en) * 1927-12-22 Franz Sengbusch Manhole cover filling
DE1956898U (en) * 1967-01-04 1967-03-09 Streicher Fa M MANHOLE COVER WITH FRAME AND LID.
CH674034A5 (en) * 1987-03-17 1990-04-30 Cewag Duedingen Tree trunk base surrounding slab - comprises concrete or stone panels with recesses for trunk and air circulation-water drain holes
EP0287798A1 (en) * 1987-03-25 1988-10-26 Silo Verfahrens AG Covering for large-diameter receptacles and welding device for the production of metal sheets for such a covering
GB2243177A (en) * 1990-04-17 1991-10-23 Frederick Jones And Son Support for an access cover
EP0631015A1 (en) * 1993-06-25 1994-12-28 TONCELLI, Marcello Reinforced product consisting of a slab of natural stone or conglomerate material
DE19617747A1 (en) * 1996-05-03 1998-07-02 Hans Juergen Koegler Frame for groups of paving stones laid on ground
JPH09296467A (en) * 1996-05-08 1997-11-18 Kawasaki Tetsumou Kk Pit cover

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 03 27 February 1998 (1998-02-27) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7588392B2 (en) 2006-04-24 2009-09-15 Zurn Industries, Llc Removable grate
DE202020101621U1 (en) 2020-03-26 2020-05-07 Hans-Jürgen Trauthwein Manhole cover for a manhole cover of a sewage rainwater sewer and manhole cover

Also Published As

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