US1734358A

US1734358A - Structural floor

Info

Publication number: US1734358A
Application number: US252524A
Authority: US
Inventors: Roy V Yeager
Original assignee: Individual
Current assignee: Individual
Priority date: 1928-02-07
Filing date: 1928-02-07
Publication date: 1929-11-05
Anticipated expiration: 1946-11-05

Description

Nov. 5, 1929. R, v, YEAGER STRUCTURAL moon Filed Feb. 7, 1928 if js J4 19 Patented Nov. y5, 1929 UNITED STATES ROY v. YEAGER, or uns MOINES, IOWA STRUCTURAL Broca Application filed. February 7, 1928. Serial No. 252,524.

My invention relates to that class of structural floors in which structural metal joists are employed, and the concrete floor is supported upon said joists, with all or part of 5 the joists ext-ended below the floor and fircproofed.

The object of my invention is to provide a structural floor of this character to which fireproofing material, such gypsum, may be readily and easilyl moulded about the lower portions of the joists, before the joists are placed in position, and this -tireproofing material will furnish a temporary support for the plaster boards between the joists.

In this connection, a further object is to provide a structural joist which may be adequately fireproofed with a minimum thickness of fireproofingfmaterial. These plaster boards resting upon the fireprooiing material will form an adequate temporary Support for the concrete licor in plastic condition, and when the floor has setand hardened, it will become bonded with the plaster board.

A further object of my invention is to provide a structural joist in which the top chord is made of two relatively small members spaced apart, and the lower ychord made of a single member, and whereby when the upper chord has become embedded in the set and hardened concrete, it will be prevented from buckling due to compression strains by't1 il() action of the concrete in which the spaced apart upper chords are embedded. In this connection it should be explained that the or dinary structural joints now in use are made with the cross sectional area of the upper chord much greater'than the cross sectional area of the lower chord, whereas with my improved floor construction these structural joists are preferably made with the cross sec tional area of the upper chords the same as, or less than, the cross sectional area of the lower chord, thus effecting a substantial saving in structural metal for the joists.

My invention consists in the construction, arrangement and combination of the various parts of the device, whereby the objects contemplated are attained, as hereinafter more fully set forth, pointed out in my claim, and

illustrated in the accompanying in which: f

Figure 1 shows a side elevation of a portion of a floor structure with firejgn'ooiing material applied to the lower portion of the jcists, part of which is broken yaway to show the lower rchord member and with plaster board supported upon the fireproofing material, and shown in section, and with a concrete floor moulded upon the plaster board and about the upper chord member, and shown in section.

Figure 2 shows a transverse sectional view on the line 2 2 of Figure 1; and

Figure 3 shows a transverse sectional view on the line 3 3 of Figure 1. k

Referring to the accompanying drawings, it will be seen that my improved joist comprises a lower chord made of one piece of metal, preferably round in cross section. This chord comprises a horizontally arranged end member 10 designed to rest on the structural beams or walls, a part 11 eX- tending downwardly therefrom at an angle of about 415, and a horizontally arranged central portion 12.y Resting on top of the end members 10 are reinforcing blocks 13, and resting against the sides of these reinforcing blocks are theupper chord members le and l5. Bracing members 16 are provided to connect the upper and lower chord members at intervals, and they are preferably welded to the top of the lower chord member and extended between and welded to the upper chord members.

The cross sectional area of the upper chord members 14 is the same as, or less than, the

, cross sectional area of the lower chord member.

When a floor is being constructed, a suitable mould is provided and the lower chord member of each joist is placed centrally in the mould. Then there is applied in the mould gypsum fireproobfing material, or the like, in plastic condition, which very soon sets and hardens, and when the joist is removed from the mould, the fireproofing material is bonded and anchored to it and forms an adequate fireproofing for the lower chord member. The upper end of the ireprooing drawings,

material forms a horizontal shoulder which is spaced apart a considerable distance from the top chord member, which ireprooting material is indicated by the numeral 1'?.

After the joists have been laid in position, layers of plaster board 18 are placed in position between the joists and resting upon the top ofthe iireproofing material 17. Then the concrete floor 19 in plastic condition is placed on the plaster board and surrounds and, extends above the top of the upper chord members, and after the floor has set andl hardened.

the plaster board becomes bonded with the concrete floor.

In practical use, it is obvious with my improved' oor structure there isv eiiected an economy in the amount of structural metal necessary for the joists, because the lower chord has applied to it in use only tension strains, and the upper chord member-has appliedto it only compression strains, and hence the upper chord members are embedded in rigid concrete that cannot buckle, and hence can be made with much less metal than could properly be used heretofore in iioor structures in which theA concrete floor was placed above the upper chords.

t willbe noted also that with my improved structural floor there is an economy in the amountfot1 fireproofingnecessary for the lower chord, because since the lower' chord is made ofy one piece of metal only, it is or" less diameter tromsideto side than if it were made of twoA members side by side, and hence the amount of lireproofing material necessary to adequately iireproof it isvgreatly reduced.

1 claim as my invention:

In a structural floor, the combination of a number of structural oists, each comprising a top chord made of two parallel chord members spacedfapart laterally, a single lower chord member connected at its ends to the upper chord member with its central portion spaced below the upper chord member, braces secured to the lower chord member and projected between and secured to the upper chord members, the transverse dimensions of the two upper chord members being,` much greater than the transverse diameter of the single lower chord member, a body ot' tireproof materialfor each beam moulded about and bonded to and completely surrounding the lower portion of each beam, and having at its upper portion supporting shoulders ez:- tended laterally, plaster boards supported upon said shoulders and extended from one beam to the other, and a concrete ioor supported upon the plaster boards and completely surrounding and bonding` the upper portions of the beams.

Des Moines, IoWa,.J`anuary 20, 1928.

ROY V. YEAGER.