US757804A - Bridge. - Google Patents

Description

PATENTED APR. 19, 1904.

E. L. 6: J. G. DILDINE.

BRIDGE.

APPLICATION nun no. 21, 1903.

2 SHEETS-SHEET 1.

K0 MODEL.

rig w snvenl'ow ,Erncat 2.21"]4'7776 4 Jmcs C ,priama Wihwaoeo No. 757,804. 7 PATENTBD APR. 19, 1904;

E. L. &. J. G. DILDINE.

BRIDGE.

APPLICATION FILED DBO. 21. 1903. N0 MODEL. 2 SHEETS-SHEBT 2.

hm "m mum flu mm F0115 wihwoaea I fa/775$ v v ttoznug UNITED STATES Patented April 19, 1904:.

PATENT OFFICE.

ERNEST LESLIE DILDINE AND JAMES CHAUNCEY DILDINE, OF CAMERON,

MISSOURI.

BRIDGE.

SPECIFICATION forming part of Letters Patent No. 757,804, dated April 19, 1904.

Application filed December 21, 1903. Serial No. 186,065. (No model.)

Too/ll whom it may concern:

Be it known that we, ERNEST LESLIE DIL- DINE and J AMES CHAUNoEY DILDINE, citizens of the United States, residing at Cameron, in the county of Clinton and State of Missouri, have invented certain new and useful Improvements in Bridges; and We do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to metal bridges, more particularly of the type constructed on what is known as the triangular-truss principle.

An object of the invention is the production of an improved bridge of this character which by reason of its extreme simplicity of structure possesses relatively great strength and durability and may be constructed at a comparatively very low cost from standard structural shapes, such as channel-bars, I- beams, angle-irons, T- bars, and plates.

In the construction and erection of existing bridges of the type named, so far as We are aware, the specifications invariably call for structural shapes of metal which are not standard products of the roller-mill, but which, on the contrary, require more or less bridge-shop work of an expensive nature to fit them for their place in the bridge structure. Such special work includes cutting to exact lengths, forging, beveling, mitering, bending, facing, and assembling and riveting together girder parts preparatory to shipment to the bridge site. In bridges having pin-connected trusses further special work is required to provide the pin-holes, and, more over, special connecting-pins must be fashioned to insure accuracy of assemblage. Further, the comparative complication of construction of existing bridges is at the expense of strength, which, as is Well known, increases with simplification in frame structures.

The improved bridge structure is built of parts furnished standard by the roller-mill and not necessarily of exact lengths, the parts being shipped direct from the mill to the site of erection without special preparation, thus eliminating the bridge-shop and materially reducing the cost of construction, which sav- Ing may, if deslred, be expended in obtaining parts containing relatively more metal than is present in the parts of existing bridges.

The nature of the invention will be readily comprehended in all of its details, reference being had to the following description, and to the accompanying drawings, in which Figure 1 is a side elevationof a truss-bridge 1 Fig. 3 is a horizontal section above Figs. 4 and 5 are enlarged detail 2 3, flanking the end posts 4. 5 and the intermediate posts 6 7 8. Obviously the number of intermediate posts will depend upon the length of the bridge structure. The bars 2 3 have their recessed sides outermost and are secured to the posts by bolts or rivets 9 9 without the use of interposed plates. In lieu of channel-bars, angle-irons may be employed, as will be understood.

The top chord 10 may, as shown in Figs. 2 and 7 consist of an I-beam 11 or, as shown in Figs. 4 and 5, may be built up of three channel- bars 12, 13, and 14 or two channel-bars 15 and 16 and an I-beam 17. The top chordbeams are so arranged and are of such sizes that connection may be made with the other 1 parts of the truss Withoutbeing Initered and without the use of forged or bent connectingplates or other devices necessitating special Work in the bridge-shop.

The end posts are each built up of three channel-bars 18 19 20 or two channel-bars and a connecting I-beam, and the-intermediate posts each consist of a channel-bar bolted or riveted at its lower end to the bottom chord member 2 and bolted or riveted at its upper end to a plate 21, which is in turn bolted or riveted to the outer side of the top chord.

chord member 2 and to a plate 25, bolted or riveted to the outer side of the top chord. Theend tie-bars 26 each consist of an angleiron bolted at its ends, respectively, to the member 2 and to the inner side of plate 22,. and to add further strength and rigidity each end tie-bar rests against shoulders 27 28, which are short angle-irons secured to the member 2 and the plate 22.

The floor-beams 29 each consist of a channel-bar or I-beam or a channel-bar and an angle-iron. The floor-beams rest on the tops of the bottom chord members and are bolted or riveted to the intermediate posts and to said members without the interposition of connecting-plates. By so connecting these parts kneebraces are provided to strengthen the truss and also the post connection with the bottom chord. The lateral crossed bars 30 each con,- sist of angle-irons bolted or riveted at their ends to the bottom chords, the connections being made with the flanges of the members 2 3 without the use ofconnecting plates or forgings. The sway-braces 31, which consist of angle-irons, are bolted or riveted directly to the end posts, and the strut, consisting of two channel-bars 32 32, is bolted or riveted to the end posts near the bases thereof, the strut members being secured to the inner and outer sides of said pair of posts. In Figs.- 6 and 7 the bridge structure is shown as supported on a stone or like foundation 33 in lieu of the metal foundation shown in Figs. 1 and 2.

1n the application of our invention to atrussbridge resting at its ends upon stone or other walls we dispense with the necessity for expensively-constructed end shoes by attaching the bottom chords directly to the end posts, which construction provides a shoe having greater efficiency than can be obtained from a shoe designed and built with the most expensive' shopwork.

From the foregoing it is apparent that the present bridge structure is composed entirely of parts furnished standard by the roller-mill, the parts being shipped directly from said mill to the bridge site and requiring no work'such as can be performed only in aregular bridgeshop. By such structure not only is the cost of construction and erection of this type of bridge material reduced, but the work can be done in a much shorter time than heretofore. Further, the saving in cost by reason of the elimination of the bridge-shop may be applied to the purchase of parts containing relatively more metal than is now employed in bridge parts, thus adding to the strength and durability of the bridge.

We claim as our invention 1. A triangular truss-bridge structure made .throughout of standard parts and comprising end posts, bottom chords each consisting of two channel-bars bolted or riveted directly to opposite sides of said end posts, top chords composed of flanged beams resting on the end posts, flat end plates connecting the top chords and end posts, intermediate flanged bar-posts secured directly to the bottom chords and connected to the top chords by flat plates, end and intermediate tie bars each consisting of a flanged bar secured to the top chord by a flat plate and secured directly to the outer bottom chord member independentlyof the connection between the latter and the intermediate posts, and floor-beams secured directly to the bottom chord members and to the' posts.

2. A triangular truss-bridge structure made throughout of standard parts and comprising end posts, bottom chords each consisting of two channel-bars bolted or riveted directly to opposite sides of said end posts, top chords composed of flanged beams resting on the end posts, flat end plates connecting the top chords and end posts, intermediate flangedbar-posts secured directly to the bottom chords and connected to the top chords'by flat plates, end and intermediate tiebars each consisting of a flanged bar secured to the top chord by aflat plate and secured directly to the outer bottom chord member independently of the connection between the latter and the intermediate posts, floor-beams secured directly to the bot tom chord members and to the posts, and horizontally-crossed bars secured directly to the bottom chordmembers.

In testimony whereof we aflix our signatures in presence of two witnesses.

' ERNEST LESLIE DILDINE.

JAMES CHAUNCEY DILDlNE. Witnesses:

M. B. SMITH, OSCAR D. KOoHONQ

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