US1318870A

US1318870A - canada

Info

Publication number: US1318870A
Authority: US
Publication date: 1919-10-14
Anticipated expiration: 1936-10-14

Description

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REINFORCED CONCRETE (5mm, APPLICATION FILED JUNE 5,1919

1,318,870. Patented Oct. 14,1919.

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UNITED STATES PA ENT onnron.

JAMES EARLE HEBER, 0E WALKERVILLE, ONTARIO, CANADA, ASSIGNOB. T0. TRUSSED CONCRETE STEEL COMPANY OF CANADA, LIMITED, OF WALKERVILLE, ONTARIO,

CANADA, A CORPORATION.

REINFORCED-CONCRETE GIRDER.

Application filed June 5,1919. Serial No. euaoea' I To all whom it may concern:

Be it known that I, JAMns EARLE HEBER, a citizen of the United States, and residing at Valkerville, in the county of Essex and Province of Ontario, Dominion of Canada, have invented a new and Improved Reinforced-Concrete Girder, of which the following is a specification.

This invention relates to the construction of reinforced concrete beams and girders and its object is to provide a structural member which will contain a minimum amount of concrete, cost of erection being considered. It further consists in a reinforced concrete floor carried by posts, which floor embodies a girder extending between posts, joists at an angle to the girder, and forms or tiles between the joists, the width of the girder between the ends of the forms adjacent the posts being less than its width at its middle portion, and a floor slab extending over the forms and joists.

In the accompanying drawing, Figure 1 is a plan of a partly completed floor. Figs. 2 and 3 are sections on the lines 22 and 33 of Fig. 1.

Similar reference characters refer to like parts throughout the several views.

In ordinary reinforced concrete floors supported primarily by means of girders extending between and integral with posts,

the girders are usually T-shaped in cross section and beam reinforcements are embedded in the bottoms of these girders and cantaliver reinforcements extend through the posts in those parts ofthe girders above the neutral axis which are subject to tension stresses. Such cantaliver reinforcements usually extend from the posts to just beyond the line of contra-flexure.

In the drawings, the posts 1 are connected by girders 2 from which the floor 3 extends laterally. On the section line-3-3 of Fig. 1, the girder is Tshaped, the depth of the head 4 of the T being that of the floor, the amount ofconcrete in the upper half of the beam being sufficient to withstand the crushing stresses above the neutral axis at the middle, of the girder, the tension stresses below the neutral axis being resisted by the reinforcing bars 5. This T-shaped structure extends each way from the middle of the girder about one-fourth its length to the line of contra-fiexure where it narrows doWn to the width shown in Fig. 2, and its tension zones above'the neutral axls are .re-

inforoed by the bars 6 which pass through the posts. The width of the head of the girder at both the lines 2-2 and 33 may be determined by the forms 7 and the caps 8 over their ends. While these air-space forming-devices may be of any desired character, I prefer those shown in the United States patent to Kane, No. 1,065,449, dated I June 24, 1913.

.Extending laterally between the forms 7 are concrete joists which are reinforced by means of

tension bars

9 and 10 in the usual manner, the latter extending across the girder above the neutral axis of the joists, and above these forms and connecting with the upper portion of the girder are the slabs 12 of concrete.

For example, a girder twenty-seven inches deep supporting a twelve inch floor and having a head thirty inches wide at the middle and for one-half its length may be twelve inches wide below the floor and near the tionate lessening of the load on the posts The saving of concrete and labor is enormous in large buildings without any loss of load carrying capacity.

The details and proportions of these gird- .ers and floor constructions may all be varied by civil engineers without departing from the spirit of my invention as set forth in the following claims.

I claim V 1. A reinforced concrete girder, and posts supporting the same and integral therewith, said girder comprising a" concrete body which is T-shaped in cross section between lines of contra-flexure and rectangular for the remainder of its length, reinforcing rods lying below the neutral axis of the girder, and other reinforcing rods extendingfrom the posts into said girder above the neutral axis. I

2.. A reinforced concrete girder and posts supporting the same and integral therewith, said girder comprising a concrete body which is T-shaped in cross section between lines of contra-flexure and rectangular for the remainder of its'len 'th; reinforcing rods lying below the neutral axis of the girder, and other reinforcing rods extending from the posts into said girder above the neutral axis, the width of the girder between the posts and the lines of contra-flexure being substantially the width of the lower portion of the T-shaped central portion of the girder.

3. A reinforced concrete floor construction comprising posts and continuous girders supported thereby, arallel lines of forms extending from sale glrder, 101sts extending between the forms, and a slab extending over the forms and uniting the 15 JAMES EARLE HEBER.

Copies of this patent may be obtained for five cents each, by addressing the Gommissioner of Patent Washington, D. O.