Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1996-05-07
1999-06-29
Friedman, Carl D.
Metal working
Method of mechanical manufacture
Assembling or joining
52693, 52694, 527302, 5274519, B21D 2810
Patent
active
059157453
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a grid-shaped reinforcement strip adapted for reinforcing horizontal masonry joints. Grid-shaped here means a mesh structure of steel wires of any cross-sectional shape whatsoever which are welded to one another.
BACKGROUND, OBJECTS AND SUMMARY OF THE INVENTION
In masonry construction, consecutive horizontal rows of building stones are laid on top of one another. After a row is completed in this process, a layer of binding cement, such as mortar or adhesive, is spread over its top side. A reinforcement strip is then laid on top of this layer, and then a layer of binding cement is again spread over the top side of this reinforcement strip such that the two layers then flow into one another through the mesh of the grid, which results in the creation of one single layer of binding cement with the reinforcement strip imbedded in it. The following row of building stones is then laid on top of this, such that a horizontal joint is created between the previous and the subsequent row of building stones. This joint is thus reinforced against the development of vertical cracks which would tend to run through this joint. If the row of building stones is longer than the length of one reinforcement strip, then of course more reinforcement strips are laid end to end with a certain amount of overlapping to assure the continuity of the reinforcement. Care is then taken that the breaks in the reinforcement strips in successive joints be then situated so as to be staggered in relation to one another.
In order to be adapted for the reinforcement of such horizontal masonry joints, such strips have a breadth of approximately 0.6 to 0.9 times the thickness of the wall they are intended to reinforce, which means a breadth on the order of between 3 cm and 30 cm, and usually between 5 cm and 18 cm. A practical length for ease of handling on the work site is in the range between 2 and 7 meters. In general, they are completely flat, but this does not mean they cannot contain indentations projecting outside this flat plane, which could then fit into the cavity of the wall or into vertical openings in or between the building stones. Further, in order to be adapted for the reinforcement of horizontal masonry joints, the mesh structure of the strip needs to be open enough to permit the mortar, adhesive or other binding cement sufficiently to flow through the grid when the building stones are laid, in such a manner that, in the joint between the two adjacent rows of building stones, a single layer of binding cement can be formed, that joins the two rows of building stones with one another and in which the structure is embedded. And finally, in order to be adapted for the reinforcement of horizontal masonry joints, a number of the steel wires which are part of the mesh structure, must each run straight in the longitudinal direction from the one longitudinal end of the strip to the other, have a cross-section ranging between 6 and 20 mm.sup.2 and a steel tensile strength of more than 450 N/mm.sup.2. These are the reinforcement wires. The remaining wires of the grid then serve to join together these longitudinally running reinforcement wires into a single piece in the form of a grid-shaped strip. The whole of these remaining wires is here called the steel wire connecting structure. This connecting structure can take on a great variety of different forms, for example consisting of a number of separate cross-wires which are welded to the reinforcement wires on both sides to form a ladder structure or, by preference, consisting of one single zigzag wire, as will be given as an example below. Viewed separately, without the reinforcement wires, this connecting structure can thus in and of itself form either a number of interconnected units, or a collection of separate wires. The invention will not be limited to any specific embodiment of this connecting structure, although the embodiment as one single zigzag wire will be the preferred embodiment.
A usual embodiment for such a grid-shaped reinfo
REFERENCES:
patent: 1646974 (1927-10-01), Moyer
patent: 3183628 (1965-05-01), Smith
patent: 3961738 (1976-06-01), Ollman
patent: 4227359 (1980-10-01), Schlenker
patent: 4869038 (1989-09-01), Catani
Looverie Alois
Timperman Paul
Friedman Carl D.
Kang Timothy B.
N.V. Bekaert S.A.
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