Bridges – Suspension – Cables and cable clamps
Patent
1990-12-10
1992-02-18
Britts, Ramon S.
Bridges
Suspension
Cables and cable clamps
14 18, E01D 1900, E01D 1100
Patent
active
050881426
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a device for fastening a guy to a concrete deck of a bridge, especially of a bridge with so-called "radiating" guying, in which a series of guys connects uniformly spaced points of the deck to the top of a supporting mast.
According to the conventional techique, a guy is fastened to the deck by ensuring that the guy passes through the deck, usually in the region of a longitudinal boom, in order to carry, on the opposite face of the deck, end retention means which bear on this lower face of the deck.
When the deck is made of reinforced concrete, the presence of the tubes containing the guys, which are at inclinations varying uniformly from one end of the bridge to the other, the angle with the horizontal decreasing in proportion to the distance from the mast, disturbs the reinforcing device to a considerable extent, thus making it necessary to produce the latter with particular care which is incompatible with high-speed production or with prefabrication on a relatively industrial scale.
The object of the invention is to overcome this disadvantage and to provide a fastening device which does not make it necessary to change the reinfoarcing planes in the region of each fastening of the guy and which consequently makes it possible to achieve faster construction less liable to risks of error.
To achieve this result, the invention provides a device for fastening a guy to a concrete deck of a bridge which comprises:
a metal plate, one face of which is designed to come up against a plane bearing surface of the deck, this face carrying at least one projection capable of penetrating into a cavity of the deck, to prevent the plate and the said plane bearing surface from sliding one relative to the other,
means for fastening the end of the guy, these means being carried by mountings fixed to the face of the plate opposite that designed to come to bear against the deck, and
prestressing cables or ties capable of keeping the plate bearing against the plane surface of the deck, these cables or ties bearing on the side of the deck opposite that carrying the said plane surface.
Preferably, the projection and/or the cavity have a form of revolution about an axis perpendicular to the plane of the plate of the plane bearing surface, to allow the device to be oriented according to the direction of the guy.
In an advantageous embodiment, the projection contains retention means for one of the said prestressing cables or ties.
According to a first embodiment, the fastening means are intended to make it possible to maintain the guy at a non-zero inclination relative to the plate. This arrangement is used advantageously ii the said plane bearing surface of the deck is a horizontal surface and if the prestressing cables or ties pass downwards through the deck so as to come to bear on a horizontal surface extending in the opposite direction of the said deck.
According to another embodiment, the anchoring means are intended to make it possible to keep the guy in a plane parallel to that of the plate. This second embodiment is especially advantageous if the plane bearing surface of the deck is carried by one of the edges of the deck and has, relative to the vertcal, the same angle as the sheet of which the guy which the device is to hold forms part, and if the prestressing cable or tie passes through the deck in a direction which as a whole is transverse and approximately horizonta..
The invention also provides a guyed bridge which is equipped with devices such as those described above, and the particular feature of which is that the deck carries, at regular intervals, plane bearing surfaces oriented parallel to one another, and the plane bearing surfaces support fastening devices which maintain the cables at different directions from one another.
The invention will now be explained in more detail with reference to practical examples illustrated by means of the drawings of which:
FIG. 1 is an elevation view of a guyed bridge for which the device according to the present invention is suitable.
FIG. 2 is
REFERENCES:
patent: 3414924 (1968-12-01), Perkey
patent: 3491393 (1970-01-01), Neeld et al.
patent: 3953980 (1976-05-01), Bennet
patent: 4648147 (1987-03-01), Zimmerman et al.
patent: 4987629 (1991-01-01), Muller
Britts Ramon S.
Connolly Nancy
Societe Anonyme Dite Societe Centrale d'Etudes et de Realisation
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