Electric heating – Metal heating – Wire – rod – or bar bonding
Patent
1990-01-16
1991-10-01
Lateef, Marvin M.
Electric heating
Metal heating
Wire, rod, or bar bonding
B23K 1100
Patent
active
050535978
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method of fabricating double-layer, welded grid bodies which are bent in a circular-arc shape and which consist of grids located opposite one another comprising longitudinal and cross wires crossing one another and welded at the intersections and of straight web wires which hold the grids apart at a predetermined mutual distance and are welded at each end to a wire of one of the two grids, in which method the grids are bent and are arranged at a distance from one another, whereupon the web wires are inserted from the outside of the grids into the intermediate space between the grids, and each web wire is welded to the adjacent wires of the grids. Furthermore, the invention relates to an installation for performing the method.
BACKGROUND OF THE INVENTION
German Offenlegungsschrift 3,148,939 discloses a method of fabricating reinforcement bodies for concrete structural parts, in which method cylindrical wire baskets for reinforcing ferroconcrete pipes are connected to one another by web wires. The cylindrical wire baskets are first supported with a horizontal axis in such a way that the axes of the wire baskets first of all do not coincide and the wire baskets are thus not concentric. A spacer is then fed horizontally in the direction of the theoretical centre point of the reinforcement body to be fabricated and is welded to the wires of the cylindrical wire baskets. After the wire baskets have been appropriately turned upwards, the following spacers are welded in one after the other. In the process, the two wire baskets move further and further apart from their initial position, which is characterized by a common contact point, until the concentricity of the two wire baskets is obtained. In this fabricating method, the concentricity is obtained only after a sufficiently large number of spacers have been welded in, since only a large number of spacers distributed at the periphery are able to carry the weight of the inner or outer wire basket not supported by the rollers or the drum. This known procedure is not only relatively complicated but has in particular the disadvantage that the spacers as well as their weld locations on the wire baskets are subjected to considerable bending stress. In addition, the known procedure can only be applied to wire baskets which consist of complete circles but not to grid bodies of annular sections, for only wire baskets of complete circles are dimensionally stable in such a way that they can be worked without workpiece-dependent mechanisms and can be moved into a concentric position by simple turning after the spacers have been welded in.
SUMMARY OF THE INVENTION
The object of the invention is to create a method of the type specified at the beginning and an installation for performing the method with which double-layer, welded grid bodies bent in a circular-arc shape can be fabricated in a simple manner in a continuous operation, which grid bodies consist of annular sections and their spacers are stress-free.
The method according to the invention has the features from that, to fabricate grid bodies in the form of annular sections, the two grids, at a mutual distance corresponding to the desired thickness of the grid body, are moved forwards concentrically to one another and in a vertical position along concentric circular feed paths, and that, after the web wires have been welded, preferably in pairs, to the grids, the finished grid body is removed from the outside of the path.
This procedure enables grid bodies of annular sections having stress-free spacers and weld locations to be satisfactorily fabricated in a continuous operation. According to the invention, the concentricity of the grids is accurately defined from the beginning in particular as a result of the circular feed to which the grids and the grid body are subjected in a definite manner.
The grids are preferably fed in the form of prefabricated grid mats which, before they are arranged on the circular feed paths, are bent in accordance with the path radius.
The subject-matter of
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Lassbacher Anton
Ritter Gerhard
Ritter Klaus
Schmidt Gerhard
EVG Entwicklungs-u Verwertungs-Gesellschaft m.b.H.
Lateef Marvin M.
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