US871076A - Reinforced steel column. - Google Patents

Description

PATENTED NOV. 12, 1907.

E. SWBNSSON.

REINFORCED STEEL COLUMN.

APPLICATION PIH'BD JUNE 17. 1907.

W/f/KiSS/SIS UNITED STATES PATENT oEEioE.

ERIC SWENSSON, OF MINNEAPOLIS, MINNESOTA, ASSIGNOR TO MINNEAPOLIS STEEL & MACHINERY COMPANY, OF MINNEAPOLIS, MINNESOTA, A CORPORATION.

REINFORCED STEEL COLUMN.

Specification of Letters Patent.

Patented Nov. 12, 1907.

Application filed June 17. 1907- Serial No. 379.863.

To all whom it may concern:

I Be it known that I, ERIC SwnNssoN, a citizen of the United States, residing at Minneapolis, Hennepin county, Minnesota, have invented certain Improvements in Reinforced Steel Columns, 01' which the following is a specification.

The object of this invention is to provide a steel column, reinforced by concrete, which two materials in combination make a column strong enough to carry the entire dead and live loads upon said column, which is to be an integral part of any structure suitable for this kind of construction. Said combination of the two materials, the steel and the concrete, are intended to provide a maximum of strength together with a minimum of material,,with certainty, ease, and facility of erection, and also intended to constitute an improved fire proof construction.

To this end the invention consists in the constructions and combinations hereinafter described and particularly pointed out in the claims.

In the accompanying drawings for oing part of this specification, Figure 1 is an elevation partly broken away, of a column embodying my invention. Fig. 2 is ahoriz ontal transverse section of the same. Fig. 3 is an elevation showing a modified column. Fig 4 is a horizontal transverse section of the column shown in Fig 3. Figs. 5 and 6 are detail views illustrating the means for rigidly securing the longitudinal rods to the I-section.

In carrying out this invention, I provide an I-section formed prel'erably of two pairs of oppositely arranged angle-irons 1 and 2 laced together by the diagonal bars 3. A single system of these bars maybe employed, or, if preferred, a double system of such bars may be arranged to lacethe angle-irons together. In any case, this web lacing is to be snflicient to provide for any web stresses in the column engendered by dead load during construction or erection, and also in conjunction with the wiring and concrete further on men tioned, .to provide for possible web stresses when the column is in full action under totaldead and live load.

For columns carrying heavy loads I may insert a system of longitudinal rods 4 extending the whole length of the column as shown in Figs. 1 and 2, but for ordinary construction a column without these rods is usually sufiicient. If these longitudinal rods are used, they-,will preferably be rigidly fastened to the I-section.

Any suitable means may be einployed for securing the rods to the l section, but I prefer to employ brackets l l l 4 bolted to the I-section and having clips 4 for clasping the rods and holding them in place on the brackets.

Outside the Isection and longitudinal rods 4 and at a small distance from the face of the concrete, as shown in Figs. 2 and 4, I provide a strong steel wiring 5. This wiring is to be circular in shape, wound the whole length of the column with a suitable pitch and is to be held to its proper pitch and place by the longitudinal spacing bars, rods or wires 6. "he purpose of this wiring is to increase the compressive resistance of the con crete and to prevent the concrete from disintegrating or flaking off the steel during stress. My experiments have shown that, if this wiring is rightly proportioned, as to size and pitch, the concrete will adhere to the steel and take its proper share of the stresses engenderedby the loads under which the column is acting, even when these loads will rupture the steel framing. This the concrete otherwise will not do. But,'in addition to thus greatly increasing the strength of the column, this wiring also greatly increases the fire prool' qualities of the construction, because even under most severe lire the concrete will crack off only until the wiring is reached and no further, thus leaving the strength of the column nearly unimpaired. lu-l'act, this wired concrete will have the same lire resistance relative to plain concrete as wire glass has to plain glass.

Thus it is to be clearly understood that this rciuforced steel construction of columns here shown and described has for its object not only the use of concrcl c as a necessary fire proofing, but also its use as a large and important factor contributing to the carrying capacity of the column, the wiring greatly augmenting the compressive strength of the concrete; said wiring also making the concrete act conjointly and harmoni ously with the steel framing, thus enabling me to obtain the same simultaneous factor of safety in both materials. all which full size tests made by me has shown to be true.

I do not limit myself to the details of the construction as these may be varied in many particulars without departing from my invention, the accompanying drawing and the above description being lnlcuded to show only fundamental essentials.

I claim as my invention:

1 A reinforced steel column, comprising, in couibina tion, an l-section formed of oppositely arranged angle-irons laced together, a steel wiring surrounding said Lsection, and a concrete filling, substantially as described.

2. A reinforced steel column comprising, in combination, an I-section formed of oppositely arranged angle-irons laced together, a steel wiring surrounding said I-section, said steel wiring being held to its proper place and pitch by longitudinal spacing bars, rods, or wires, and a-concrete filling, substantially as described.

3. A reinforced steel column comprising, in combination, an I-section formed of two pairs of oppositely arranged angie-irons, diagonal lacing straps connecting said pairs of angle-irons, a system of longitudinal rods on both sides of the I-sectlon, extending the entire length of the column and being rigidly fastened to the I-section, a steel 10 wiring surrounding said I-section and said rods and a concrete filling, substantially as described. I

In witness whereof, I have hereunto set m'yhand this 7th day of June 1907.

ERIC SWENSSON.

- Witnesses: v

- J. B. ERA,

J. H. BALnwIn

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