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Receptacle having a circumferentially pre-stressed peripheral wall composed of concrete slabs
| Details |
Inventors: Moldrup, Soren J.;
Assignee: A/S Dansk Spaendbeton (DK)
Primary Examiner: Ridgill, Jr.; James L.
Assistant Examiner:
Attorney, Agent or Firm: Lane, Aitken & Ziems
In a large size receptacle, e.g. for a mixture of liquid and solid manure, the peripheral wall comprises a circular series of reinforced concrete slabs having a plain external surface and presenting, at each vertical joint between successive slabs, groove shaped recesses or notches for receiving circumferentially extending pre-stressing wires. |
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DETAILED DESCRIPTION From this prior art the receptacle according to the invention differs in that the concrete slabs have plain external surfaces and, adjacent their vertical joint edges, a groove shaped recess for each of the wires, the depth of said recesses increasing towards the edge faces.
By the elimination of the horizontal and vertical strengthening ribs, the strengthening duty of which may be undertaken by an ordinary reinforcement within the slabs, the production costs of these slabs may be reduced but, at the same time, provisions must be made to ensure that the circumferential pre-stressing wires are sufficiently localized during and after erection, and that no undue strain concentrations are created in the wires or between the wires and the concrete elements.
For this purpose, groove shaped recesses are provided which, with a view to holding the wires during erection, may have a width such that the wires are held by friction against the side faces of the recesses and, with regard to the strain distribution, prevent the creation of more or less sharp bends in the wires over a joint between two adjacent slabs.
A further effect is that at the joints the wires will be positioned close to the neutral plane of the slab elements which not only improves the distribution of the compressive strain in the concrete elements but also reduces the risk of a total or partial collapse of the wall of the receptacle in case of an external force, e.
g.
caused by a colliding vehicle.
In order that identical elements may be used for receptacles of varying diameters while maintaining the advantages referred to above, it is preferred, according to the invention, that the bottom of the recess merges tangentially into the external slab surface and that the depth increases progressively towards the edge face.
In such case the wires will be more deeply positioned in the recesses, the more the angle between the elements, or the diameter of the receptacle, is reduced.
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Screen Walls 
