Static structures (e.g. – buildings) – With component having discrete prestressing means – Beam – girder – or truss construction
Patent
1986-01-06
1988-02-16
Murtagh, John E.
Static structures (e.g., buildings)
With component having discrete prestressing means
Beam, girder, or truss construction
52741, 29452, 264229, E04C 508
Patent
active
047246391
ABSTRACT:
A prestressing anchor is embedded in concrete in part of a concrete structural component, and after setting of the concrete, a prestressing element extending through the prestressing anchor is prestressed and held by clamping wedges disposed in a frustoconical portion of a passage running through the prestressing anchor. Thereafter, a spacer element and an associated or integral further prestressing anchor provided with clamping wedges are pulled onto the prestressing element. With the aid of screws passing through flanges of the prestressing anchors, the further prestressing anchor is held to the first prestressing anchor, the spacer element resting snugly against the end faces of the clamping wedges. The second phase of construction is then carried out, at which time the further prestressing anchor is also embedded in concrete. After setting of the concrete, the following section of the prestressing element is prestressed to about the same value as the preceding section. In this intermediate anchor arrangement, only the clamping wedges of the prestressing anchor first embedded in concrete exert their full clamping action upon the prestressing element, whereas the clamping wedges of the further prestressing anchor exert only a slight clamping action. If the prestressing in the following section suddenly gives way in the event of trouble, the prestressing in the preceding section is maintained thanks to the clamping wedges in the prestressing anchor first embedded in concrete. In case of sudden release of the prestressing in the preceding section, the clamping wedges of the prestressing anchor first embedded in concrete are pulled out of the latter, this movement of displacement being transferred by the spacer element to the clamping wedges of the further prestressing anchor. The clamping wedges of the further prestressing anchor are thereby brought into their clamping position, and the prestressing in the following section of the prestressing element is maintained.
REFERENCES:
patent: 2180866 (1939-11-01), Cryer
patent: 3033600 (1962-05-01), Drysdale
patent: 3573346 (1971-04-01), Appleby
patent: 3590474 (1971-07-01), Beghi
patent: 3844697 (1974-10-01), Edwards
patent: 4307550 (1981-12-01), Behar
patent: 4368607 (1983-01-01), Boonman
Murtagh John E.
Rudy Andrew J.
VSL International AG
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