Mould bed for manufacturing pre-stressed concrete elements

Details Mould bed for manufacturing pre-stressed concrete elements Mould bed for manufacturing pre-stressed concrete elements

1998-11-17

2000-12-05

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

Distinct means to feed, support or manipulate preform stock...

And means to apply stress to preform and uniting in stressed...

264228, 264229, B28B 702

Patent

active

061558109

DESCRIPTION:

BRIEF SUMMARY
FIELD OF INVENTION

The present invention relates to a mould bed for manufacturing pre-stressed concrete elements.
SE-A-7705021 and SE-A-7812505 (both in the name of A-Betong) and U.S. Pat. No. 4,201,711 (Thomsen, et al) and U.S. Pat. No. 4,290,991 (Thim) disclose examples of mould beds for the manufacture of pre-stressed concrete elements of considerable lengths, often lengths exceeding 100 m, which are then cut into shorter elements to provide railway sleepers.
The strong tension forces in the reinforcing ropes or lines are partially taken up by anchoring the tensioning heads at the ends of the mould, although the actual mould bed frame will also be subjected to compression forces that act along the full length of the mould.
With the intention of taking up these compression forces, hitherto known beds have included I-beams or H-beams, which result in comparatively large and cumbersome frame constructions that, in turn, make access to the actual mould bed--in which different elements to be moulded in the pre-stressed concrete elements are placed--difficult to achieve.


DESCRIPTION OF THE BACKGROUND ART

In addition to the aforementioned publications, reference can be made to German Patent Specification 223 011 (Carl Grahn) which describes a mould bed that is delimited by longitudinally extending beam elements that include triangular reinforcements.
DE-A-2 303 487 (Eduard Seidner Maschinenfabrik) describes a steel frame for fabricating pre-stressed, rod-like concrete elements, in which pressure elements extend along the mould with the intention of supporting the reinforcement ropes as they are tensioned. These pressure elements have the form of round beams that are braced by legs that extend at right angles from the mould and include round beam-receiving holes. These leg parts are spaced relatively far apart along the mould bed. It is not certain therefore that the leg parts will be able to prevent the round pressure-absorbing beams from buckling or fracturing as a result of sideways acting forces, particularly when the reinforcement lines or ropes are heavily tensioned.


OBJECTS OF THE INVENTION

One object of the present invention is to provide a more slender and less expensive pressure-relieved mould frame while eliminating the aforesaid drawbacks and other drawbacks related to known mould beds.
Another object of the invention is to provide a pressure-relieved mould bed that can be accessed more readily than known mould beds, i.e. a mould bed in which different elements and devices to be cast in the pre-stressed concrete elements can be placed more readily in the bed.


SUMMARY OF THE INVENTION

Because the inventive bed utilizes long rods or bars of an uncomplicated profile, e.g. a rectangular or round profile instead of the aforesaid I-beams or H-beams for relieving pressure in the bed, and because the sleeve elements prevent the rods from buckling or snapping sideways as a result of said pressure, there is obtained a more slender and less expensive mould frame.
The reduced dimensions of the mould frame in relation to known mould frames enables access to be achieved more readily, for instance for manually placing different types of devices and elements that are to be cast in the pre-stressed concrete elements.
The sleeve elements per se are conveniently stiffened through the medium of anchoring devices that grip in the underlying supporting surface, e.g. a concrete floor.
There may be disposed between the rods and the sleeve elements means that will facilitate relative movement therebetween. The means may, for instance, be comprised of a layer of low-friction material, e.g. nylon or Teflon, applied to the rods and/or to the sleeve elements.
The sleeve elements may extend either continuously or discontinuously along the mould bed. When the sleeve elements are discontinuous, one or more wheels or rollers for supporting a pressure-absorbing bar may be disposed in the spaces between mutually adjacent sleeve elements.
The sleeve elements need not, in practice, tightly embrace the uncomplicated bars that

REFERENCES:
patent: 3568274 (1971-03-01), Hidden et al.
patent: 4758393 (1988-07-01), Cazenave et al.
patent: 5404827 (1995-04-01), Baltz et al.
Merriam-Websters Collegiate Dictionary, 10th Edition. 1999. Merriam-Webster Inc. p. 1103.

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