Pre-stressed concrete structures

Details Pre-stressed concrete structures Pre-stressed concrete structures

1976-03-19

1977-11-08

Perham, Alfred C.

Static structures (e.g., buildings)

With component having discrete prestressing means

Beam, girder, or truss construction

61 87, 61100, 264 32, 264 34, 264228, E04C 310, E02B 100

Patent

active

040569055

ABSTRACT:
A method of installing a tendon in a duct in a slip-formed concrete structure including the steps of providing a tubular member which forms the uppermost part of the duct and whose upper end terminates at the level where the upper end of the tendon is to be anchored, said tubular member having outwardly extending abutment means at or adjacent its lower end, said abutment means being of such size and at such depth below the upper end of the tubular member as to enable the forces necessary to instal and support a tendon in the duct, at the time when the concrete structure reaches a height in the vicinity of the upper end of said tubular member, to be transmitted through the tubular member and distributed to the concrete structure by the abutment means at a level where the concrete has gained adequate strength for this purpose.

REFERENCES:
patent: 1489742 (1924-04-01), Davenhall
patent: 3216162 (1965-11-01), Gerber et al.
patent: 3249664 (1966-05-01), Georgii
patent: 3307310 (1967-03-01), Kourkene
patent: 3537268 (1970-11-01), Georgii
Engineering News-Record May 10, 1973, p. 39.

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