EP2995723B1 - Shaft cover frame - Google Patents

Description

The invention relates to a frame of a manhole cover for manholes, as installed in squares or streets.

Such manhole covers must withstand high static and dynamic traffic loads. In addition, the connection between the frame and the surrounding pavement must be permanently solid or at least even, so that no paving of the pavement in the transition area can take place.

Well-known frames for manhole covers usually consist of a cast iron top, on which a surrounding concrete ring is cast (such as from document DE-A1-101 30 082 known). The frames provide for the storage of the manhole cover. In addition, the frames (especially the tops) have a textured surface to increase the skid resistance of the frame and lid.

As cast iron corrodes, there is a visual deterioration of the frame and possibly the lid. In addition, the corrosion radiates to the surrounding surfaces or road surfaces, if rusty particles of polluted water overflow the adjacent coverings. The rust particles penetrate into the pores of the surfaces or surface coverings and there is a clear optical disadvantage. By remedying such damages high costs arise.

Corrosion-resistant cast iron frames have not gained acceptance, as the stresses on the road wear and tear off the applied coatings, which in turn leads to corrosion.

The invention is based on the object to show a frame of a manhole cover to the effect that a high durability after installation is ensured at low production costs. By "durability" is meant in particular the avoidance of all the above disadvantages.

This object is achieved by a frame according to claim 1.

• ein Oberteil aus Kunststoff mit angeformten und nach unten ragenden Verankerungsrippen und mit einer nach unten kragenden Außenschürze und/oder einer nach unten kragenden Innenschürze, die mindestens einen Teil eines Außenumfangs bzw. eines Innenumfangs des Rahmens bilden, und
• ein Unterteil aus Beton, das an das Oberteil unter Einschluss der Verankerungsrippen und unter Freilassung von Außenoberflächen der Außenschürze und der Innenschürze angegossen ist.

In particular, this object is achieved by a frame of a manhole cover comprising:

• a plastic top with molded and downwardly projecting anchoring ribs and with a downwardly cantilevered outer skirt and / or a downwardly cantilevered inner skirt forming at least part of an outer periphery and an inner periphery of the frame, and
• a lower part of concrete, which is molded to the upper part including the anchoring ribs and leaving free outer surfaces of the outer skirt and the inner skirt.

A first essential point of the invention lies in the fact that the entire outwardly open or externally accessible part of the frame is made of plastic, but the vertical loads are passed through the molded base of concrete directly into the shaft structure. Corrosion is thus safely avoided even when attacking de-icing agents. The plastic parts in turn are protected from distortion by the concrete of the base.

Furthermore, in the production of the frame, the upper part with its outer / inner skirt, which are each formed circumferentially, protected against distortion during concreting of the lower part. In turn, the downwardly projecting aprons improve the adhesion to the lower part of the concrete and thus prevent the edge of the plastic upper part from becoming detached from the concrete.

After installation, the outer skirt is supported in the adjacent pavement of the traffic area and thus additionally prevents the release of the plastic upper part of the concrete base of the frame.

Preferably, the substantially radially outwardly projecting anchoring ribs are formed at least in pairs to each other in the direction of the outside of the frame diverging. This results in improved adhesion of the upper part of the lower part.

Likewise, there is an improvement in the adhesion of the upper part of the lower part, when the anchoring ribs are arcuately curved.

The outer skirt and / or the inner skirt have at their lower edges sealing portions for sealing a concrete mold. These seals are pressed (with deformation) so firmly onto the concrete casting mold that, during concreting, the seam between the concrete mold and the plastic part is closed in a liquid-tight manner. This avoids that the plastic part is contaminated by leaking concrete vat. These sealing portions are preferably designed as circumferential sealing lugs with a height of 0.5 and 2 mm (preferably 1 mm). In cross section, these sealing noses can be formed rectangular, triangular or trapezoidal.

The lower part is preferably reinforced by a reinforcement. As reinforcement suitable here in particular a reinforcing ring, which is cast in the concrete base. In order for the production to be particularly simple, the anchoring ribs preferably have holding devices for holding the reinforcing ring (or else several reinforcing rings) before casting on the lower part. If at least some of the anchoring ribs are formed in a staircase, then these steps can form the holding means for the reinforcing ring (or several reinforcing rings), without having to provide separate parts.

The upper parts are formed with their anchoring ribs such that two upper parts with mutually facing anchoring ribs under the engagement of the anchoring ribs in spaces between the anchoring ribs can be placed into each other to save space. This results in a considerable Space saving during transport between the place where the upper part made and the place where the lower part is cast.

The tops can be designed as closed rings. In a further embodiment of the invention, the upper parts consist of at least two, but preferably of four identical segments, each having at the end connecting means for fixed connection to another segment. As a result, a plurality of segments can be cast with a single injection mold of a certain outer dimension.

The upper part preferably has recesses and / or depressions for receiving and / or attaching additional parts, e.g. of mud flaps or securing devices for a cover. This results in an increased range of use of the frame.

In particular, at least some of the recesses are closed upwards and open at the bottom. As a result, the opening is covered by the frame itself and it can engage bars or the like securing means of a manhole cover. These recesses can be aligned with corresponding recesses formed in the lower part, which is the case in particular when the recesses are open inwards, so that slots are formed continuously from the upper part to the lower part.

Fig. 1

eine perspektivische Ansicht von schräg oben auf einen vollständigen Rahmen,

Fig. 2

einen Ansicht von schräg unten auf den Rahmen nach Fig. 1,

Fig. 3

eine Ansicht ähnlich der nach Fig. 1 jedoch unter Fortlassung des Unterteils,

Fig. 4

eine Ansicht entsprechend der nach Fig. 2 jedoch unter Fortlassung des Unterteils,

Fig. 5

einen Schnitt entlang der Linie V-V aus Fig. 4,

Fig. 6

eine Ansicht des in Fig. 5 mit VI bezeichneten Bereiches,

Fig. 7

eine Ansicht ähnlich der nach Fig. 6 jedoch unter Fortlassung des Armierungsringes und in einem etwas anderen Winkel,

Fig. 8

eine Unteransicht des Oberteils gemäß Fig. 4,

Fig. 9

den Bereich IX aus Fig. 8 in einer vergrößerten Darstellung und

Fig. 10

zwei ineinander gestapelte Oberteil-Segmente.

Hereinafter, preferred embodiments of the invention will be explained in more detail with reference to drawings. Show here

Fig. 1

a perspective view obliquely from above on a complete frame,

Fig. 2

a view from diagonally below on the frame Fig. 1 .

Fig. 3

a view similar to the one after Fig. 1 but omitting the lower part,

Fig. 4

a view according to the Fig. 2 but omitting the lower part,

Fig. 5

a section along the line VV Fig. 4 .

Fig. 6

a view of the in Fig. 5 VI area,

Fig. 7

a view similar to the one after Fig. 6 but omitting the reinforcing ring and at a slightly different angle,

Fig. 8

a bottom view of the upper part according to Fig. 4 .

Fig. 9

the area IX Fig. 8 in an enlarged view and

Fig. 10

two nested top segments.

In the following description, the same reference numerals are used for the same and like parts.

As in the Fig. 1 and 2 illustrated, the embodiment of the frame shown here comprises an upper part 10 made of plastic and a lower part 30 which is molded onto the upper part 10. The upper part 10 consists of four segments 1 to 4, as in particular in the Fig. 1 and 3 is shown. These segments 1 to 4 are firmly connected to each other by connecting means not described in detail herein.

From the top 10 projecting down anchoring ribs 20, which together with a reinforcing ring 14 (see Fig. 4 ) are poured into concrete to form the lower part 30.

The upper part 10 furthermore has an outer skirt 12 and an inner skirt 13. The outer skirt 13 and the inner skirt 14 extend with their outer surfaces flush with the corresponding outer surfaces of the (concrete) lower part 30.

Furthermore, the outer skirt 12 and the inner skirt 13 sealing portions 15 and 16, as in Fig. 6 is shown. These sealing portions 15 and 16 come into play when a concrete base 30 is cast on a top 10. For then seal the sealing portions 15, 16, the outer skirt 12 and the inner skirt 13 against a (not shown here) Shape which is filled with concrete. The contact pressure is in this case made so strong that the sealing portions 15, 16 deform slightly and ensure an absolute tightness between the upper part 10 and the (not shown) mold. This ensures that no concrete septic tank contaminates the outside of the outer skirt 12 or the inner skirt 13.

Anchoring ribs 20 have - as in particular in the 8 and 9 shown - curved portions 21 and 22, which - seen in the radial direction outward - diverge and merge into a connecting portion 23. The curvature of the sections 21, 22 and the divergent construction lead to an improved anchoring of the lower part 30 on the upper part 10.

In a direction perpendicular to the surface of the frame, some of the anchoring ribs 20 have steps 24, as shown in FIG Fig. 10 is shown. When casting a lower part 30 to an upper part 10, in which the upper part 10 is "upside down", the anchoring ribs 20 are thus up, a reinforcing ring 14 can be inserted so that it lies in the inner corner of the steps 24 of the anchoring ribs 20 thus formed comes, as for example in Fig. 4 is shown. As a result, the reinforcing ring is fixed in the radial and vertical directions when casting the lower part 30.

The upper part 10 also has closed recesses 17 and open recesses 18 (see in particular Fig. 3 ). The closed recesses 17 are also aligned with corresponding recesses 31 of the lower part 30, as the open recesses 18. The closed recesses 17 are therefore not visible from above, in the installed state of the frame. They can engage with bolts that hold a manhole cover on the frame. The open recesses 18 are intended in this example for inserting a commercially available mud flaps.

LIST OF REFERENCE NUMBERS

1

segment

2

segment

3

segment

4

segment

10

top

12

outer skirt

13

inside apron

14

reinforcing ring

15

sealing portion

16

sealing portion

17

Closed recess

18

Open recess

20

anchoring rib

21

Curved section

22

Curved section

23

connecting portion

24

step

30

lower part

31

recess

Claims (11)

1. A shaft cover frame, comprising

   - an upper part (10) made of plastics having anchoring ribs (20) that are molded on and protrude downward, and having an outer skirt (12) protruding downward and/or an inner skirt (13) protruding downward which form at least a part of an outer circumference or an inner circumference of the frame, and

   - a lower part (30) made of concrete which is cast on the upper part while including the anchoring ribs (20) and leaving the outer surfaces of the outer skirt (12) and the inner skirt (13) free.
2. The frame according to claim 1,
   characterized in that
   the anchoring ribs (20) are formed at least in pairs to be mutually diverging in the direction toward an exterior of the frame (sections 21 and 22).
3. The frame according to any one of the preceding claims,
   characterized in that
   the anchoring ribs (20) are curved in an arch shape (21, 22).
4. The frame according to any one of the preceding claims,
   characterized in that
   the outer skirt (12) and/or the inner skirt (13) comprise sealing portions (15, 16) at their lower edges for sealing a concrete casting mold.
5. The frame according to any one of the preceding claims,
   characterized by
   at least one reinforcement ring (14) cast into the lower part (30).
6. The frame according to any one of the preceding claims, in particular according to claim 5,
   characterized in that
   the anchoring ribs (20) exhibit holding means (24) for at least one reinforcement ring (14) prior to casting the lower part (30) on, the holding means (24) in particular comprise e.g. stepped gradations of the anchoring ribs (20).
7. The frame according to any one of the preceding claims,
   characterized in that
   the upper parts (10) with their anchoring ribs (20) are formed such that two upper parts (10) having mutually facing anchoring ribs (20) may be set into each other between the anchoring ribs (20) in a space-saving manner while the anchoring ribs (20) engage into clearances.
8. The frame according to any one of the preceding claims,
   characterized in that
   the upper parts (10) are constituted from at least two, preferably four identical segments (1 to 4) each comprising end side connecting means for firmly connecting to a further segment.
9. The frame according to any one of the preceding claims,
   characterized in that
   the upper part (10) has recesses and/or depressions (17, 18) for receiving and/or attaching additional parts, e.g. dirt traps or securing means of a lid.
10. The frame according to any one of the preceding claims, in particular according to claim 9,
    characterized in that
    the recesses comprise recesses that are closed to the top (17) and open to the bottom (18).
11. The frame according to any one of the preceding claims, in particular according to any one of claims 9 or 10,
    characterized in that
    the recesses (17, 18) are arranged to be aligned with corresponding recesses (31) formed in the lower part (30).

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