Static structures (e.g. – buildings) – Machine or implement
Patent
1974-04-15
1976-03-23
Ridgill, Jr., James L.
Static structures (e.g., buildings)
Machine or implement
249 23, 52319, E04B 120, E04C 330
Patent
active
039451682
ABSTRACT:
A steel joist formwork and a composite steel and concrete floor structure provided with a top chord, a bottom chord and a web joining the top and bottom chords with the top chord being serpentine shaped like an S or Z and including top and bottom, generally horizontal portions and an intermediate portion integrally connecting opposite edges of the top and bottom portions with the top and intermediate portions substantially being adapted to be embedded in the concrete floor to cause the floor and steel joists to act structurally as a composite beam. Either the web or a leg depends vertically from the free end of the bottom portion of the top chord, and the web joining the top and bottom chords is substantially solid or is, an open web formed of a zigzag bar member. There is also disclosed a building system and erecting method utilizing steel joists spaced apart by spanner bars which also support rigid panels which act as formwork for the pouring of concrete. The spanner bars and the joists are so arranged to cooperate that the spanner bars may be removed together with the rigid panels after the concrete has been poured, and the spanner bars, the rigid panels and if desired the steel joists may be reused for formwork for additional poured concrete construction. Alternatively the joists may be left in place either with the top chords embedded in the poured concrete to provide a composite action, or merely supporting the concrete slab in the conventional fashion. A novel cold rolled sheet steel joist may be advantageously used to form a particularly economical composite system. This steel joist is shaped in an I-beam configuration with an upper top chord bent to have the appearance of the letter Z in cross-section for bonding with the concrete floor.
REFERENCES:
patent: 827268 (1906-07-01), Stieper
patent: 1924096 (1933-08-01), Adams
patent: 1974730 (1934-09-01), Zollinger
patent: 2169253 (1939-08-01), Kotrbaty
patent: 2202096 (1940-05-01), Dell et al.
patent: 2508635 (1950-05-01), Badt
patent: 2511584 (1950-06-01), Hill
Butts Ernest O.
Hall John S.
Hambro Structural Systems Limited
Ridgill, Jr. James L.
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