Static structures (e.g. – buildings) – With synthetic resinous component – With nonresinous component
Patent
1981-05-28
1983-12-13
Machado, Reinaldo P.
Static structures (e.g., buildings)
With synthetic resinous component
With nonresinous component
52378, 52699, E04C 100
Patent
active
044198523
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for preserving connecting bars which is fastened into the shuttering during the production of steel concrete structures and which exhibits an elongated preserving element in which the end sections of the connecting bars, to be bent out for connecting a concrete structural member to be connected later, but first bent approximately at right angles, are inserted.
In the production of concrete structures a distinction is made between space joints (also called expansion joints) and construction joints. Whereas the former form a permanent delimitation of one structural member relative to another, the latter are necessary only for technical reasons of execution; they are supposed to guarantee later on a force-locking connection largely corresponding to the monolithically cast members.
It is customary to make connecting bars a party to such a connection. In order not to have to provide for holes in the shuttering of the construction joint, through which holes such connecting bars extend, the portions of the connecting bars projecting from the structural member to be first concreted are first bent approximately at right angles and are fastened to the shuttering or near the shuttering in such a way that they can be be bent out or back again after removal of the shuttering. In order at the same time to keep the bent portions of the connecting bars free of concrete and to facilitate the mentioned bending out and back, a device for preserving connecting rods is sometimes used, which device is inserted in the shuttering and fastened and guarantees during concreting the formation of a cavity around the end sections of the connecting bars to be bent out.
Such preserving devices are already known in various designs, among others from DE Patent Specification No. 2,307,073 and from CH Patent Specification No. 562,376. The former of these prior publications discloses a preserving device which consists of preserving pieces, preserving front, and spacing strips lying between and is made of an elastically deformable material. The fabrication of this device is very expensive, but has the advantage of easy stripping off the first-concreted structural member. According to the second of the above-mentioned two publications the preserving element consists of a foam material body in which the end sections of the connecting bars to be bent out are embedded. This solution has found wide application; however, the scraping-out of the foam material necessary after stripping of the first-concreted structural member is time-consuming and involves the risk that residues, which disturb the force-locking connection of the following concrete member, remain stuck in the construction joint.
The task underlying the invention is to indicate for a preserving device of the above-described kind a formation which retains the advantages of the previously known embodiments without their disadvantages being inherent therein. Production should not only be economical, but also the removal of the device, no longer needed after stripping of the first-concreted structural member, should be able to take place quickly and effortlessly.
The task is solved in that the preserving element consists mainly of a thin-walled mould part formed of thermoplastic synthetic material (produced by the press-mould or deep-drawing method), in which preserving troughs open towards the flat side, receiving the end sections, are otherwise filled with an embedding mass, brittle in the hardened state, adhering neither to the connecting bars nor to the synthetic material mould part, the device as a whole forming a rigid structural unit of permanent shape.
As the embedding mass, silicate-base mixtures are used to advantage, as for example plaster-sawdust mixture or aeroconcrete, the desired properties of which are widely controllable through additives, as for example bentonite. The adhesion of the embedding mass to the concrete of the structural member can also be easily avoided by a coat of parting compound, as for example white lime. For laying bare t
REFERENCES:
patent: 1715743 (1929-06-01), Duggan
patent: 1742883 (1930-01-01), Venzie
patent: 1798134 (1931-03-01), Danielson
patent: 4010586 (1977-03-01), Brechbuhler
Losinger AG
Machado Reinaldo P.
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