EP0427911B1 - Cast iron and concrete circular manhole cover with ventilation slots - Google Patents

Cast iron and concrete circular manhole cover with ventilation slots Download PDF

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Publication number
EP0427911B1
EP0427911B1 EP90111781A EP90111781A EP0427911B1 EP 0427911 B1 EP0427911 B1 EP 0427911B1 EP 90111781 A EP90111781 A EP 90111781A EP 90111781 A EP90111781 A EP 90111781A EP 0427911 B1 EP0427911 B1 EP 0427911B1
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EP
European Patent Office
Prior art keywords
cover
concrete
peripheral wall
manhole cover
flange
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.)
Expired - Lifetime
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EP90111781A
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German (de)
French (fr)
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EP0427911A1 (en
Inventor
Dieter Dipl.-Ing. Kunz
Alfred Dipl.-Ing. Fuchs
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.)
ACO Ahlmann SE and Co KG
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Passavant Werke AG and Co KG
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Publication of EP0427911A1 publication Critical patent/EP0427911A1/en
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    • 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 manhole cover of the type specified in the preamble of claim 1.
  • a ring of circular ventilation openings arranged at equal angular intervals is provided, each of which is delimited by an annular wall shaped like a tower or a shaft from the bottom of the shell, which is connected to the circumferential wall of the cover by a radial rib is.
  • the concrete filling can extend anywhere up to the relatively thin cover peripheral wall.
  • This previously known cover already has a favorable ratio of the cast iron portion to the concrete portion, in particular since the concrete is also radially outward and in part fills areas of the lid shell lying over the contact surface.
  • the aim is to further reduce the cast iron content without impairing the strength of the lid.
  • a disadvantage of the known cover is that the surface of the concrete filling is not continuous, but is interrupted by the ring walls of the ventilation openings. As a result, the introduction and hardening of the concrete, in particular hardening by means of a compacting tool, is made more difficult. With less solidification, however, the contribution of the concrete filling to the strength of the cover is less, which must be compensated for by more extensive dimensioning of the cast iron content.
  • the well-known manhole cover lacks exposed cast iron surfaces of sufficient width on its top side to be able to affix the markings provided in accordance with the standard, such as manufacturer and product designation, as well as quality, standard and class information.
  • FR-OS 2 450 912 a circular manhole cover made of cast iron and concrete is known, the ventilation openings of which are not circumferential, but are arranged in two diametrically opposed segment-shaped groups, directly adjoining the peripheral wall of the cover and are separated from each other by radial ribs.
  • the cast iron content of this lid is, however, relatively high, not only because of the accumulation of cast iron material in the area of the grouped ventilation openings, but above all because the concrete filling is not exposed upwards, but is covered by a cast iron cover plate that is screwed to the bottom of the bowl is and forms a supporting part of the lid.
  • the concrete must be poured through a central bottom opening in the cover shell, which interrupts the continuous shell bottom and thus reduces its load-bearing capacity, and compacting the concrete with a pressing tool is not possible.
  • This lid also does not have a favorable attachment option for a removal tool. It is also disadvantageous with this cover that the ventilation openings are located radially so far outside that surface water running into them runs down the shaft wall and cannot get into a dirt trap which is suspended in the shaft and is at a distance from the shaft wall.
  • the invention has for its object to provide a manhole cover of the type mentioned in such a way that it allows for a simple introduction and compaction of the concrete filling with a consistently favorable or even further improved weight ratio between cast iron and concrete content and offers a good possibility of engagement for a removal tool.
  • the cast iron shell 1 of the lid shown has an upwardly concave dish bottom 3, which runs within the nominal diameter D of the lid with a substantially constant wall thickness and a substantially constant radius of curvature, that is to say spherically curved, and merges into the approximately perpendicular circumferential wall 5, which approximately has the same wall thickness as the shell bottom 3.
  • the slightly downwardly projecting bearing surface 7, which determines the nominal diameter D and is sufficient is broadly designed to optionally provide a dovetail groove for receiving an elastic damping insert 9 (cf. FIG. 3).
  • the shell 1 formed by the shell bottom 3 and the peripheral wall 5 contains a concrete filling 11 which is flush with the upper edge of the peripheral wall 5 and preferably consists of concrete compacted by shaking and pressing.
  • the shell bottom 3 can be provided on its inside with radially extending flat (indicated by dashed lines) stiffening ribs 13.
  • each ventilation opening 17 has the shape of an elongated hole, the center line of which can be concentrically curved to the center of the cover.
  • the dimensions, in particular the width, of each ventilation opening 17 are chosen so that the safety standards are not exceeded.
  • each ventilation opening 17 can have a width of 28 mm and a length of 200 mm.
  • each ventilation opening 17 the peripheral wall 5 'is made so thick that its thickness corresponds to the width of the bearing surface 7. From this solid outer wall 5, a flange 19 projects inwards on the top side of the lid, which flange forms the outer boundary of the ventilation opening 17.
  • the upper surface of the peripheral wall 5 'and / or the flange 19 can be formed as a labeling field, in which a lettering molded into the cast iron, for example with manufacturer and product designation, quality mark, as well as specification of norms and classes, can be provided .
  • the ventilation opening 17 is set radially inward from the circumference of the cover so that the ventilation opening is located within the diameter of a strainer basket arranged in the shaft below the cover.
  • an air gap of at least 30 mm width is provided between the outer edge of the basket and the inner edge of the shaft frame, which is necessary for effective ventilation of the shaft. Since the ventilation openings 17 are correspondingly offset radially inward, the surface water flowing in through them with the dirt contained therein nevertheless reaches the dirt trap.
  • a drip bead 23 prevents the water from flowing out along the underside of the flange 19 and thereby the Bypasses mud flaps. The drip bead 23 also prevents the lifting tool from slipping off.
  • the top of the concrete filling forms a uniform uninterrupted surface, so that it is very easy to compact the concrete with a pressing or vibrating compacting tool acting from above. It is also advantageous that the thickening of the circumferential wall 5 'above the support surface 7 prevents the support surface 7 from forming an undercut in the pocket 13 formed in the shell base 3. No casting core is therefore required to form the pocket 15 in the shell bottom.
  • Ventilation openings 17 can also be provided at corresponding angular intervals.
  • Each ventilation opening can also be designed as a straight, non-curved elongated hole.
  • labeling can also be provided on the upper side of the flange 19.

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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)
  • Building Environments (AREA)
  • Toys (AREA)
  • Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)

Abstract

A cast-iron and concrete circular manhole with a concrete-filled, trough-shaped shell (1) which merges into a peripheral wall (5) with a bottom bearing surface (7) has a number of air openings designed as elongated holes or slots which are each arranged near the edge and are connected to the peripheral wall (5) by a flange (19) at the top of the manhole, an engagement pocket for a lifting tool which can be inserted through the air openings (17) being formed beneath the flange. <IMAGE>

Description

Die Erfindung betrifft einen Schachtdeckel von der im Oberbegriff des Anspruchs 1 angegebenen Art.The invention relates to a manhole cover of the type specified in the preamble of claim 1.

Bei einem aus DE-PS 28 57 528 bekannten Schachtdeckel dieser Art ist ein Kranz von in gleichen Winkelabständen angeordneten, kreisrunden Lüftungsöffnungen vorgesehen, von denen jede durch eine vom Schalenboden türmchen- oder schachtartig hochgeformte Ringwand begrenzt ist, die mit der Deckelumfangswand durch eine Radialrippe verbunden ist. Um die Lüftungsöffnungen herum kann sich die Betonfüllung überall bis an die relativ dünne Deckelumfangswandung erstrecken.In a manhole cover of this type known from DE-PS 28 57 528, a ring of circular ventilation openings arranged at equal angular intervals is provided, each of which is delimited by an annular wall shaped like a tower or a shaft from the bottom of the shell, which is connected to the circumferential wall of the cover by a radial rib is. Around the ventilation openings, the concrete filling can extend anywhere up to the relatively thin cover peripheral wall.

Dieser vorbekannte Deckel weist bereits ein günstiges Verhältnis des Gußeisenanteils zum Betonanteil auf, insbesondere, da der Beton auch radial weit außen und teilweise über der Auflagefläche liegende Bereiche der Deckelschale ausfüllt. Das Bestreben geht aber dahin, den Gußeisenanteil noch weiter zu senken, ohne die Festigkeit des Deckels zu beeinträchtigen. Ein Nachteil des bekannten Deckels besteht darin, daß die Oberfläche der Betonfüllung nicht durchgehend, sondern von den Ringwänden der Lüftungsöffnungen unterbrochen ist. Hierdurch wird das Einbringen und Verfestigen des Betons, insbesondere ein Verfestigen mittels eines Verdichtungswerkzeugs, erschwert. Bei geringerer Verfestigung ist aber der Beitrag der Betonfüllung zur Festigkeit des Deckels geringer, was durch reichlichere Bemessung des Gußeisenanteils kompensiert werden muß. Ein weiterer Nachteil des bekannten Deckels besteht darin, daß er keinen brauchbaren Angriffspunkt für ein Aushebewerkzeug bietet, mit dem der Deckel von der Schachtöffnung abgehoben oder in sie eingesetzt werden kann. Schließlich fehlen bei dem bekannten Schachtdeckel an seiner Oberseite freiliegende Gußeisenflächen von ausreichender Breite,um die nach der Norm vorgesehenen Beschriftungen wie z.B. Hersteller- und Produktbezeichnung sowie Güte-, Norm- und Klassenangaben anzubringen.This previously known cover already has a favorable ratio of the cast iron portion to the concrete portion, in particular since the concrete is also radially outward and in part fills areas of the lid shell lying over the contact surface. However, the aim is to further reduce the cast iron content without impairing the strength of the lid. A disadvantage of the known cover is that the surface of the concrete filling is not continuous, but is interrupted by the ring walls of the ventilation openings. As a result, the introduction and hardening of the concrete, in particular hardening by means of a compacting tool, is made more difficult. With less solidification, however, the contribution of the concrete filling to the strength of the cover is less, which must be compensated for by more extensive dimensioning of the cast iron content. Another disadvantage of the known cover is that it does not offer a usable point of attack for a removal tool with which the cover can be lifted off the shaft opening or inserted into it. Finally, the well-known manhole cover lacks exposed cast iron surfaces of sufficient width on its top side to be able to affix the markings provided in accordance with the standard, such as manufacturer and product designation, as well as quality, standard and class information.

Aus FR-OS 2 450 912 ist ein kreisrunder Schachtdeckel aus Gußeisen und Beton bekannt, dessen Lüftungsöffnungen nicht kranzförmig umlaufend, sondern in zwei einander diametral gegenüberliegenden segmentförmigen Gruppen angeordnet sind, wobei sie unmittelbar an die Umfangswandung des Deckels angrenzen und voneinander durch radiale Rippen getrennt sind. Der Gußeisenanteil dieses Deckels ist allerdings relativ hoch, nicht allein wegen der im Bereich der gruppenförmig zusammengefaßten Lüftungsöffnungen vorhandenen Anhäufung von Gußeisenmaterial, sondern vor allem deshalb, weil die Betonfüllung nicht nach oben freiliegt, sondern von einer gußeisernen Deckscheibe abgedeckt ist, die mit dem Schalenboden verschraubt ist und einen mittragenden Bestandteil des Deckels bildet. Das Einfüllen des Betons muß durch eine zentrale Bodenöffnung der Deckelschale erfolgen, die den durchgehenden Schalenboden unterbricht und somit dessen Belastbarkeit herabsetzt, und ein Verdichten des Betons mit einem Preßwerkzeug ist nicht möglich. Eine günstige Ansetzmöglichkeit für ein Aushebewerkzeug weist dieser Deckel ebenfalls nicht auf. Auch ist bei diesem Deckel nachteilig, daß die Lüftungsöffnungen radial so weit außen liegen, daß in sie einlaufendes Oberflächenwasser an der Schachtwandung herabläuft und nicht in einen in den Schacht eingehängten, mit Abstand zur Schachtwandung angeordneten Schmutzfänger gelangen kann.From FR-OS 2 450 912 a circular manhole cover made of cast iron and concrete is known, the ventilation openings of which are not circumferential, but are arranged in two diametrically opposed segment-shaped groups, directly adjoining the peripheral wall of the cover and are separated from each other by radial ribs. The cast iron content of this lid is, however, relatively high, not only because of the accumulation of cast iron material in the area of the grouped ventilation openings, but above all because the concrete filling is not exposed upwards, but is covered by a cast iron cover plate that is screwed to the bottom of the bowl is and forms a supporting part of the lid. The concrete must be poured through a central bottom opening in the cover shell, which interrupts the continuous shell bottom and thus reduces its load-bearing capacity, and compacting the concrete with a pressing tool is not possible. This lid also does not have a favorable attachment option for a removal tool. It is also disadvantageous with this cover that the ventilation openings are located radially so far outside that surface water running into them runs down the shaft wall and cannot get into a dirt trap which is suspended in the shaft and is at a distance from the shaft wall.

Der Erfindung liegt die Aufgabe zugrunde, einen Schachtdeckel der eingangs genannten Art so auszubilden, daß er bei gleichbleibend günstigem oder sogar weiter verbessertem Gewichtsverhältnis zwischen Gußeisen- und Betonanteil ein einfaches Einbringen und Verdichten der Betonfüllung ermöglicht und eine gute Eingriffsmöglichkeit für ein Aushebewerkzeug bietet.The invention has for its object to provide a manhole cover of the type mentioned in such a way that it allows for a simple introduction and compaction of the concrete filling with a consistently favorable or even further improved weight ratio between cast iron and concrete content and offers a good possibility of engagement for a removal tool.

Diese Aufgabe wird erfindungsgemäß durch die Merkmale des Anspruchs 1 gelöst. Die Unteransprüche beziehen sich auf vorteilhafte weitere Ausgestaltungen der Erfindung.This object is achieved by the features of claim 1. The subclaims relate to advantageous further refinements of the invention.

Eine Ausführungsform der Erfindung wird anhand der Zeichnungen näher erläutert. Es zeigt:

  • Fig. 1 eine Draufsicht auf eine Hälfte des Schachtdeckels,
  • Fig. 2 einen Schnitt durch den Schachtdeckel nach der Linie II-II von Fig. 1,
  • Fig. 3 eine perspektivische Detailansicht im Bereich einer Lüftungsöffnung.
An embodiment of the invention is explained in more detail with reference to the drawings. It shows:
  • 1 is a plan view of one half of the manhole cover,
  • 2 shows a section through the manhole cover along the line II-II of FIG. 1,
  • Fig. 3 is a detailed perspective view in the region of a ventilation opening.

Die gußeiserne Schale 1 des dargestellten Deckels hat einen nach oben konkav gewölbten Schalenboden 3, der innerhalb des Nenndurchmessers D des Deckels mit im wesentlichen konstanter Wandstärke und im wesentlichen konstantem Krümmungsradius, also sphärisch gewölbt, verläuft und in die annähernd lotrechte Umfangswandung 5 übergeht, die annähernd gleiche Wandstärke wie der Schalenboden 3 hat. Unter der Umfangswandung 5 und deren Übergangsbereich zum Schalenboden 3 liegt die etwas nach unten vorstehende Auflagefläche 7, die den Nenndurchmesser D bestimmt und genügend breit ausgebildet ist, um wahlweise eine Schwalbenschwanznut zur Aufnahme einer elastischen Dämpfungseinlage 9 anzubringen (vgl. Fig. 3). Die vom Schalenboden 3 und der Umfangswand 5 gebildete Schale 1 enthält eine Betonfüllung 11, die mit der Oberkante der Umfangswand 5 bündig liegt und vorzugsweise aus durch Rütteln und Pressen verdichtetem Beton besteht. Der Schalenboden 3 kann an seiner Innenseite mit radial verlaufenden flachen (gestrichelt angedeuteten) Versteifungsrippen 13 versehen sein.The cast iron shell 1 of the lid shown has an upwardly concave dish bottom 3, which runs within the nominal diameter D of the lid with a substantially constant wall thickness and a substantially constant radius of curvature, that is to say spherically curved, and merges into the approximately perpendicular circumferential wall 5, which approximately has the same wall thickness as the shell bottom 3. Under the peripheral wall 5 and its transition area to the shell bottom 3 is the slightly downwardly projecting bearing surface 7, which determines the nominal diameter D and is sufficient is broadly designed to optionally provide a dovetail groove for receiving an elastic damping insert 9 (cf. FIG. 3). The shell 1 formed by the shell bottom 3 and the peripheral wall 5 contains a concrete filling 11 which is flush with the upper edge of the peripheral wall 5 and preferably consists of concrete compacted by shaking and pressing. The shell bottom 3 can be provided on its inside with radially extending flat (indicated by dashed lines) stiffening ribs 13.

An vier, einander paarweise gegenüberliegenden Stellen des Deckels ist der Schalenboden vor Erreichen der Umfangswand schachtartig hochgeformt, so daß nach unten offene Taschen 15 gebildet werden, die an der Deckeloberseite in Lüftungsöffnungen 17 münden. Jede Lüftungsöffnung 17 hat die Form eines Langlochs, dessen Mittellinie zum Deckelmittelpunkt konzentrisch gekrümmt verlaufen kann. Die Abmessungen, insbesondere die Breite jeder Lüftungsöffnung 17, sind so gewählt, daß die Sicherheitsnormen nicht überschritten werden. Beispielsweise kann jede Lüftungsöffnung 17 eine Breite von 28 mm und eine Länge von 200 mm aufweisen.At four points of the lid which are opposite one another in pairs, the tray bottom is formed in a shaft-like manner before reaching the peripheral wall, so that open pockets 15 are formed which open into ventilation openings 17 on the top side of the lid. Each ventilation opening 17 has the shape of an elongated hole, the center line of which can be concentrically curved to the center of the cover. The dimensions, in particular the width, of each ventilation opening 17 are chosen so that the safety standards are not exceeded. For example, each ventilation opening 17 can have a width of 28 mm and a length of 200 mm.

Im Bereich jeder Lüftungsöffnung 17 ist die Umfangswand 5′ so dick ausgeführt, daß ihre Dicke der Breite der Auflagefläche 7 entspricht. Von dieser massiven Außenwand 5 springt an der Deckeloberseite nach innen ein Flansch 19 vor, der die äußere Begrenzung der Lüftungsöffnung 17 bildet. Die Unterseite des Flansches 19 zwischen den ihn begrenzenden Wandbereichen des Schalenbodens 3 bildet eine Eingrifftasche für ein durch die Lüftungsöffnung 17 von oben her einführbares Aushebewerkzeug, mit dem der Deckel ergriffen und entweder von Hand oder mit einem Hebezeug angehoben werden kann. Im Bereich jeder Lüftungsöffnung 17 kann die obere Fläche der Umfangswandung 5′ und/oder des Flansches 19 als Beschriftungsfeld ausgebildet sein, in welchem eine in das Gußeisen eingeformte Beschriftung, z.B. mit Hersteller- und Produktbezeichnung,Gütezeichen, sowie Norm- und Klassenangabe vorgesehen sein kann.In the area of each ventilation opening 17, the peripheral wall 5 'is made so thick that its thickness corresponds to the width of the bearing surface 7. From this solid outer wall 5, a flange 19 projects inwards on the top side of the lid, which flange forms the outer boundary of the ventilation opening 17. The underside of the flange 19 between the wall regions of the shell bottom 3 delimiting it forms an insertion pocket for a lifting tool which can be inserted from above through the ventilation opening 17 and with which the lid can be gripped and lifted either by hand or with a lifting device. In the area of each ventilation opening 17, the upper surface of the peripheral wall 5 'and / or the flange 19 can be formed as a labeling field, in which a lettering molded into the cast iron, for example with manufacturer and product designation, quality mark, as well as specification of norms and classes, can be provided .

Durch den Flansch 19 ist es möglich, die Lüftungsöffnung 17 so weit vom Deckelumfang radial nach innen zu setzen, daß sich die Lüftungsöffnung innerhalb des Durchmessers eines im Schacht unterhalb des Deckels angeordneten Schmutzfängerkorbes befindet. Bei einem genormten Schmutzfängerkorb ist zwischen dem Korbaußenrand und der Innenkante des Schachtrahmens ein Luftspalt von mindestens 30 mm Breite vorgesehen, der für eine wirkungsvolle Belüftung des Schachtes notwendig ist. Da die Lüftungsöffnungen 17 entsprechend weit radial nach innen versetzt sind, gelangt das durch sie einströmende Oberflächenwasser mit darin enthaltenem Schmutz trotzdem in den Schmutzfänger. Ein Abtropfwulst 23 verhindert, daß das Wasser an der Unterseite des Flansches 19 entlang nach außen fließt und dadurch den Schmutzfänger umgeht. Der Abtropfwulst 23 verhindert gleichzeitig ein Abrutschen des Aushebewerkzeugs.Through the flange 19, it is possible to set the ventilation opening 17 radially inward from the circumference of the cover so that the ventilation opening is located within the diameter of a strainer basket arranged in the shaft below the cover. In the case of a standardized dirt trap basket, an air gap of at least 30 mm width is provided between the outer edge of the basket and the inner edge of the shaft frame, which is necessary for effective ventilation of the shaft. Since the ventilation openings 17 are correspondingly offset radially inward, the surface water flowing in through them with the dirt contained therein nevertheless reaches the dirt trap. A drip bead 23 prevents the water from flowing out along the underside of the flange 19 and thereby the Bypasses mud flaps. The drip bead 23 also prevents the lifting tool from slipping off.

Bei dem erfindungsgemäßen Schachtdeckel bildet die Oberseite der Betonfüllung eine einheitliche ununterbrochene Fläche, so daß es sehr einfach ist, den Beton mit einem von oben her wirkenden pressenden oder vibrierenden Verdichtungswerkzeug zu verdichten. Vorteilhaft ist auch, daß durch die Verdickung der Umfangswand 5`oberhalb der Auflagefläche 7 vermieden wird, daß die Auflagefläche 7 eine Hinterschneidung der in den Schalenboden 3 eingeformten Tasche 13 bildet. Zur Formung der Tasche 15 in den Schalenboden ist deshalb kein Gießkern erforderlich.In the manhole cover according to the invention, the top of the concrete filling forms a uniform uninterrupted surface, so that it is very easy to compact the concrete with a pressing or vibrating compacting tool acting from above. It is also advantageous that the thickening of the circumferential wall 5 'above the support surface 7 prevents the support surface 7 from forming an undercut in the pocket 13 formed in the shell base 3. No casting core is therefore required to form the pocket 15 in the shell bottom.

Änderungen der beschriebenen Ausführungsformen sind im Rahmen der Erfindung möglich. So können anstelle von vier auch drei oder fünf Lüftungsöffnungen 17 in entsprechenden Winkelabständen vorgesehen sein. Jede Lüftungsöffnung kann auch als ein gerades, nicht gekrümmtes Langloch ausgebildet sein. Anstatt oder zusätzlich zu dem Beschriftungsfeld 21 über dem Umfangsrand 5 kann auch eine Beschriftung an der Oberseite des Flansches 19 vorgesehen sein.Changes to the described embodiments are possible within the scope of the invention. Instead of four, three or five ventilation openings 17 can also be provided at corresponding angular intervals. Each ventilation opening can also be designed as a straight, non-curved elongated hole. Instead of or in addition to the labeling field 21 above the peripheral edge 5, labeling can also be provided on the upper side of the flange 19.

Claims (4)

1. A circular manhole cover composed of concrete and cast iron, comprising a trough-shaped upwardly open cast-iron dish (1) whose dish base (3), which extends with approximately constant edge thickness and approximately constant curvature, merges into the peripheral wall of the cover in the edge zone and on the underside of which is formed the annular support surface (7) of the cover, and also comprising an upwardly exposed concrete filling (11) filling the trough of the dish, wherein a number of ventilation apertures (17) are formed in the cover at a radial distance from the support surface (7), which apertures are disposed angularly spaced apart and which are each bounded by a cast-iron wall (5) rising from the dish base to the upper surface of the cover, characterised in that each ventilation aperture (17) is in the form of a slot, the longitudinal extension of which extends in the peripheral direction, in that the total number of ventilation apertures is between two and six, preferably four, in that the distance between the outer edge of each ventilation aperture (17) and the peripheral wall (5′) of the cover is bridged by a cast-iron flange (19) disposed horizontally on the upper side of the cover, and in that an engagement pocket (15), which is free of concrete filling, is formed under the flange (19) for a lifting implement which can be inserted through the ventilation aperture (17).
2. A manhole cover according to Claim 1, characterised in that in the angular zone of each ventilation aperture (17) the thickness of the peripheral wall (5′) is increased to the width of the support surface (7) and the engagement pocket (15) is formed open towards the underside of the cover and free of undercuts.
3. A manhole cover according to Claim 1 or 2, characterised in that the upper surface of the peripheral wall (5′) and/or of the flange (19) is formed as an inscription panel.
4. A manhole cover according to Claim 1, characterised in that the concrete filling (11) is composed of concrete compacted by compression.
EP90111781A 1989-11-06 1990-06-21 Cast iron and concrete circular manhole cover with ventilation slots Expired - Lifetime EP0427911B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3936929A DE3936929C1 (en) 1989-11-06 1989-11-06
DE3936929 1989-11-06

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EP0427911A1 EP0427911A1 (en) 1991-05-22
EP0427911B1 true EP0427911B1 (en) 1992-05-20

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EP (1) EP0427911B1 (en)
AT (1) ATE76460T1 (en)
DD (1) DD296724A5 (en)
DE (2) DE3936929C1 (en)
DK (1) DK0427911T3 (en)
ES (1) ES2031399T3 (en)
GR (1) GR3004662T3 (en)

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DE4332968C2 (en) * 1993-09-28 1997-06-05 Buderus Guss Gmbh Round manhole cover
FR2789097B1 (en) * 1999-02-03 2001-04-06 Cahors App Elec MANHOLE HAVING A WATERPROOF WATERPROOF HOUSING WITH INTEGRATED VENT AND QUICK OPENING
FR2789098B1 (en) * 1999-02-03 2001-04-06 Cahors App Elec LOOK WITH A WATERPROOF WATERPROOF HOUSING WITH INTEGRATED VENT AND QUICK OPENING
ES2169659B1 (en) * 1999-05-05 2003-11-01 Manuf D App Electr De Cahors S REGISTRATION THAT INCLUDES A BOX UNDERSTANDED, WITH INTEGRATED BREATHER AND QUICK OPENING.
DE10351078A1 (en) * 2003-10-31 2005-07-28 betopur Kabeleinführungssysteme GmbH Air ventilation pipe socket for air ventilating ports of cover, has twelve ring shaped sockets coupled to each other by connecting parts to form socket package and arranged parallel to each other at distances relating to distances of ports
CN102409594A (en) * 2011-09-16 2012-04-11 无锡市政设计研究院有限公司 Method for carrying out compaction on pavement around well through rolling and transitional well cover for compaction

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DE730158C (en) * 1940-01-27 1943-01-07 Hoernemann & Co Manhole cover made of pressed sheet steel
AT228722B (en) * 1960-02-12 1963-08-12 Buderus Eisenwerk Cast iron manhole cover
FR1364022A (en) * 1963-05-06 1964-06-19 Improvements to the manhole covers
AT277088B (en) * 1966-06-03 1969-12-10 Wallner & Neubert Manhole cover
US4013374A (en) * 1975-10-16 1977-03-22 Passavant-Werke Michelbacher Hutte Cover for manhole structures
FR2335655A1 (en) * 1975-12-18 1977-07-15 Pont A Mousson FILLING PAD, ESPECIALLY FOR PAVEMENT GUARD
DE2857528C2 (en) * 1978-08-02 1984-06-28 Passavant-Werke AG & Co KG, 6209 Aarbergen Circular manhole cover made of cast iron and concrete
DE8633386U1 (en) * 1986-12-13 1988-01-14 Richter, Falk, 6477 Limeshain, De
DE8807335U1 (en) * 1988-06-04 1988-07-21 Eichelmann, Horst, Dipl.-Ing., 6209 Aarbergen, De

Also Published As

Publication number Publication date
DE59000131D1 (en) 1992-06-25
EP0427911A1 (en) 1991-05-22
ATE76460T1 (en) 1992-06-15
ES2031399T3 (en) 1992-12-01
DD296724A5 (en) 1991-12-12
DE3936929C1 (en) 1991-04-25
GR3004662T3 (en) 1993-04-28
DK0427911T3 (en) 1992-08-24

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