EP2150654B1 - Upper part for a shaft - Google Patents

Description

The invention relates to an upper part for a shaft.

Shaft tops are known from the prior art and usually have an outwardly curved shape. Due to this shape, these shaft tops have a good resistance to compressive forces exerted by the underground surrounding the shaft.

In the area of the transition from shaft cone and shaft access part, however, there are always deformations. In this area, radially inwardly directed force components can cause the shaft top part to bend inwards at this point or to be pressed in over the tolerance range.

Out EP 0 906 477 B1 an upper part for a shaft is known with an access part and a shaft cone, which is connected to the access part and can be placed with a peripheral edge on the side opposite the access part of the shaft cone on a shaft ring, the shaft cone has a substantially outwardly arched basic shape, wherein in the region of the transition from the access part to the shaft cone a substantially parallel to the plane in which the peripheral edge is located aligned reinforcing rib is provided on the outer surface of the shaft cone, which extends over the entire circumference.

Out WO 2007/000299 A1 Is shaft top known for a shaft having an access part and a shaft cone, which is connected to an access part and with a connecting element on the access part opposite side of the shaft cone can be placed on another shaft element, wherein the shaft cone has a substantially outwardly arched basic shape, wherein the shaft cone has at least 3 sections in which substantially mutually parallel stiffening elements are arranged.

CONFIRMATION COPY

These shaft systems are either only to be produced by expensive tools or due to the large wall thicknesses very heavy and also have no optimal load capacity.

The object of the invention was to provide a shaft top with the lowest possible wall thickness, but great stability, which is easy to produce even with simple tools and allows a homogeneous compression of the backfill material.

The subject of the invention is therefore an upper part for a shaft according to claim 1.

The shaft top according to the invention has the same wall thickness as the prior art higher load capacity. With significantly reduced wall thickness same load capacity is achieved.

Furthermore, a connecting element is provided by means of which the shaft top according to the invention can be placed sealingly on other shaft parts.

The stiffening structures of the shaft upper part according to the invention allow the resulting loads (for example, traffic load, pressure load) to be reliably reduced.

The internal stiffening structures can be considered in cross-section as a rib, bead, bead, trapezoidal, diamond-shaped or I-beam semicircular, elliptical, square, triangular or optimized depending on the application polygonal structure, so that the stiffness of the curved basic shape of the shaft cone optimized becomes.

The distances between the stiffening structures and the dimension of the stiffening structures are also optimized and executed depending on the geometry and load requirements.

The internal stiffening structures are protected against damage by the filling material (earth, gravel, gravel and the like) or by manipulation (for example during installation).
Therefore, a stable stability of the shaft top is guaranteed. The substantially smooth outer side also allows a more homogeneous compaction of the filling material than in known shaft tops.

The arrangement of the stiffening structures in the interior of an efficient tool production is possible. Due to the substantially smooth outside, therefore, the outer shells of the tools can be made much simpler.

In one embodiment, the shaft top may include further internal stiffening structures that may extend over the inner circumference.
These elements can be viewed in cross-section as a rib, bead, bead, trapezoidal, diamond-shaped or I-beam semicircular, elliptical, square, triangular or designed as depending on the application optimized polygonal structure. They may be concentric, eccentric radial, or angular around an imaginary point inside or outside the dome.

In a particular embodiment, the upper part of the shaft may have, on its outer side, optionally circumferentially extending buoyancy securing elements, which may be in the form of ribs, webs, segments, tabs, knobs, tips and the like. In this case, these buoyancy securing elements can be arranged continuously or not continuously, depending on the shape, for example, in the form of concentric circles (from an imaginary center, which may be the same or different to the imaginary point from which the stiffening extend).

The shape of the buoyancy protection elements can be optimized depending on the backfill material used.

In another embodiment, other functional structures such as hoists and the like may be freely positioned on the outside.

The access part can be arranged eccentrically or centrally, optionally holding elements can be provided inside.

In a particular embodiment, a device may be provided on the ring of the shaft top, which allows a centering of the upper part of a Schachtmittel- or -unterteil. This device can be designed as an optical marking or as a mechanical guide aid (for example as a guide pin or fork or the like).

The upper shaft part according to the invention is preferably produced from thermoplastically processable plastics, preferably in an injection molding process.

The shaft top according to the invention is, for example, for sewage shafts, water pump shafts, safety shafts, one-man bunkers, Water storage tanks, pellet storage tanks, geothermal storage tanks, service shafts (eg for electric cables).

The shaft top according to the invention is in the FIGS. 1 to 3 shown. 1, the upper part of the shaft, 2 the stiffening structures extending downwards over the arched shape of the shaft cone or shaft dome, 3 the lifting securing elements, 4 retaining elements.

Claims (7)

1. Top part (1) for a shaft, having an access part and a shaft cone which is connected to an access part and, with a connecting element on that side of the shaft cone that lies opposite the access part, can be mounted onto a further shaft element, the shaft cone having a substantially convex basic shape, wherein, in the region of the shaft dome, stiffening structures (2) are disposed on the inner surface of this shaft dome, which extend substantially radially or parallelly, angularly or concentrically from one or more imaginary points or lines within or outside the dome downwards over the curved shape of the shaft cone, wherein the outer surface has lift prevention elements (3) and/or lifting aids, wherein, thanks to the arrangement of the stiffening structures (2) in the inner region, the outer side of the top part is substantially smooth in that the outer surface has only the lift prevention elements (3) and/or the lifting aids (4).
2. Shaft top part according to Claim 1, characterized in that the stiffening structures (2) are realized as a rib, bulge, bead, trapezoidally, rhombically, or as an I-beam.
3. Shaft top part according to Claim 1 or 2, characterized in that the lift prevention elements (3) are realized in the form of ribs, webs, segments, lugs, knobs and/or spikes.
4. Shaft top part according to one of Claims 1 to 3, characterized in that it has further further internal stiffening structures if need be over the periphery, which can extend over the inner periphery and are arranged concentrically, eccentrically radially, or angularly about an imaginary point within or outside the dome.
5. Shaft top part according to one of Claims 1 to 4, characterized in that on the ring of the shaft top part an apparatus is provided for centring the shaft top part on a shaft middle part or bottom part.
6. Shaft top part according to one of Claims 1 to 5, made from thermoplastically workable plastics by means of an injection moulding process.
7. Use of a shaft top part according to one of Claims 1 to 6 for sewage shafts, water pump shafts, safety shafts, one-man bunkers, water stores, pellet tanks, buffer stores for geothermal heat, service shafts, for example for electric cables.

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