DE20004987U1 - Manhole cover - Google Patents

Description

BUDERUS HEATING TECHNOLOGY GMBH

G 2111 TE-P F/JS

Manhole cover

The innovation concerns a manhole cover in which a cast-iron frame with a lower cylinder neck is mounted in a height-adjustable guide ring resting on the manhole cone and rolled directly into the asphalt layer of the road surface.

Usually, a manhole cover is mortared onto the cone of a manhole, possibly using compensation rings. This creates a rigid, settlement-free unit that protrudes above the road level if the road surface settles. This disrupts traffic and, in the long term, requires repair work.

Since the manhole structure cannot follow the settlement movements of the roadway, the only solution to prevent a height difference between the top edge of the frame and the road level is for the manhole cover not to sit rigidly on the manhole structure, but to be arranged directly in the road surface and supported by it.

For this purpose, it is known to mortar a support ring onto the shaft. In this ring, the cast-iron frame is guided in a height-adjustable manner via a cast-on lower cylinder socket. The frame is set to exactly the right height and rolled into the bituminous road surface when it is being laid. The frame follows any change in the road level as a result of settling movements, as it is guided freely in the support ring. The problem of a possible height difference between the upper edge of the frame and the road level is solved in this way.

On frames with molded mud flap pockets, these sit on the ring at the lowest position of the frame. In this case, the height adjustment is reduced by the height of the mud flap pockets.

G2111 07.03.2000

The innovation is based on the task of increasing the vertical adjustability of the frame and reducing the overall height.

According to the innovation, this is achieved by a guide ring having recesses/depressions in its vertical extension that correspond to the outer contours of the mud flap pockets.

The frame is guided both horizontally and vertically in the guide ring via the lower cylinder neck. When the frame is in its lowest position, it can be lowered so far that the mud flap pockets engage in the recesses/depressions on the guide ring. This means that the lowering dimension is increased by the depth of the recesses/depressions, as the pockets can be lowered not only to the top edge of the guide ring, but also to the bottom of the recesses/depressions.

The recesses/depressions in the guide ring could be pulled down so far that the mud flap pockets still have free play downwards even when in the lowest position. The frame would then rest directly on the guide ring in the lowest position. It is also possible to define the lowest position of the frame by assigning the recesses/depressions to the mud flap pockets, with the pockets resting on the lower edge of the recesses/depressions.

The guide ring can be made of a suitable material. If it is made of concrete, it would have a block-like cross-section in which the recesses/depressions are made on the inner circumference. If it is made of cast iron or plastic, an H-shaped or L-shaped cross-section or another cross-section would be recommended, in the contours of which the recesses/depressions are formed. The decisive factor is that the height of the guide ring is used to enable the mud flap pockets to engage in the recesses/depressions and to allow the frame to be lowered further.

G2111 07.03.2000

The drawing shows an example of the innovation. It shows:

Fig. 1: The assignment of the frame to the guide ring in the highest position and

Fig. 2 The assignment of the frame to the guide ring in the lowest position.

The guide ring 1, in the case shown a block-shaped concrete body, is mortared onto the shaft cone. It has recesses/depressions 2 into which the dirt trap pockets 4 cast onto the frame 3 can be lowered. The frame 3 itself is guided in a height-adjustable manner via a cast-on cylinder socket 5 in the guide ring 1. It is rolled into the road surface and freely follows the settling movements. The lowering is not yet limited by the fact that the lower surfaces 6 of the dirt trap pockets 4 rest on the surface 7 of the guide ring 1, but only by the fact that they reach the contact surfaces 8 of the recesses/depressions 2. The adjustability of the frame 3 is increased by this amount and the required construction height is reduced.

G 2111 07.03.2000: :

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Claims (3)

1. Manhole cover with a guide ring (1) resting on the manhole cone and a cast-iron frame (3) with cast-on dirt trap pockets (4) which is guided in a height-adjustable manner via a lower cylinder socket (5) and is to be rolled into the asphalt layer of the road surface, characterized in that the guide ring (1) has recesses/depressions (2) in its vertical extension which correspond to the outer contours of the dirt trap pockets (4). 2. Manhole cover according to claim 1, characterized in that the recesses/depressions (2) have lower support surfaces (8) for the dirt trap pockets (4) and thus for a defined lowest position of the frame (3). 3. Manhole cover according to claim 1, characterized in that the guide ring consists of a suitable material such as concrete, cast iron or plastic with a corresponding edgewise cross-section.