USRE4172E - Improvement in corrugated iron bridges - Google Patents

Description

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Letters Patent No. 25,210, dated August 23,1859 reissue No. 4,172, dated November 1, 1870.

IMPROVEMENT IN CORRUGATED IRON BRIDGES.

The Schedule referred to in these Letters Patent and making part of the same.

I RICHARD MONTGOMERY, ofthe city, county, and kState of New York, haveinvented new and. useful Iin provements in the Construction of Corrugated Iron Bridges, Roofs, tir-c., of. which the vfollowing is a specition.

lMy invention yrelates to the con'ibination ot two o r more superimposed longitndinally-corrugated or tinted metallic beams, curved upon arcs-of different radii to form a double arch of a single span; and also to the combination of grooved saddles` and bearers with the corrugated beams constituting said double arch and with suitable tie-.bolts and, rods to support, stay, and strengthen the same y l The object of my invention being to obtain with the least weight of metal the strongest possible support for bridges, roofs, doors, and similar structures spanning wide, open intervals.

In the accompanying drawing Figure l1 represents a perspective -view of a bridge constructed on my improved plan.

Figure 2, a cross-section through the blocks or saddles C Q C parallel with and immediately in front of the bolts I I I, illustrating the same enlai-ged.

- Figure 3, a cross-section through lthe arches of the bridge passing through the' blocks or saddles C C C' parallel with and immediately in front ofthe bolts E E lil.

Figure 4 is a cross-section through one' of thc- .curved upon arcs of different radii, placed one lupon the `other, the curve of the upper beam M being greater than that of the lower one B.l

rlhe peculiar corrngation of these bezims is clearly shown in igs. 2, 3, and 4, and is such as that their ends will t into cach other andinterfold when brought together.

lhe ends of each of the double arches B M rest on bearers or socket-plates F, secured in the l abutments J J, and projecting slightly above the same.

A rlhese bearers or socket-plates F are corrugated or deeply grooved onthou-.Supper side, (sec fig. 5,) so as to form the counterpart of the under side of the beams of the arches to fit therein, and give lateral support-to their folds, thereby preventing a widening or spreading thereof.

Similar blocks orsaddlesG groored to tit over and.

uponthe upper-side of said corrugated beams, are also provided and placed upon the upper' beams of ,thel arches, as shown `in figs. 1, 2, and 3, .at each end of the arches, and at intermediate'points along their length.

The ends of /tlle arches are secured and the beams in each united by means of transverse bolts I', which pass through the saddle-blocks C, the ends of the Iarches B M, and the socket-platesF, into the abutmcnts J J.- y

The intermediate blocks C', grooved and formed like the blocks 0, are placed at equal distance-s apart upon the upper curve of the double arches, and correslmnding bottom plates or bearers G Gr, grooved like the socket-plates or bearers F to itvupon the under side of the beams, areplaced unde." the lower beams'of the double arches beneath each block C.

Suspension -bolts E are inserted through the blocks C', and through the flanges ot' both beams B and M ofthe arches, and the bottom plates G, to iirmly tie the double arches,.the.bolt-heads H heilig1 below the betteln-plates G, all as represented in iigs'.V l and 3.

lhe double. arches B M are thus united in such a way that their relative position is unchangeable, and so that they form a superstructure 'of great strength.

rlhc series of arches represented in the drawing i, are connected by corrugated cross-beams L L, which rest with their ends upon the iianges of the lower beams M of the double arches4 B M, immediately over the intermediate bottoni-plates .G,so that the bolts E shall pass and vengage theircnds, as will be seen in gs. ldand 3.

These cross-beams may be used'to support the flooring ofthe bridge; while, at lthe same time,

they tend to steadyand hold the ditferentarches togetlier.

I prefer to make. the arched or curved portion of each corrugated beam thickerthan its sides so that the greatest strength is obtained 'with a given weight of' metal. v In forming the single arches 1S or M to be combined in pairs so as -to fonn double arches B M, as described, two or more beams may be united 4longiv tudinally to form. a continuous curved arch of the required length, where the requiredspan is too great for the length of'a single beam.

I claim as my invention-- 1. The within-described double arch, formed, substantially as herein set forth, of arches B M, oi' longitudinallylcorrugated metal describing curves of different ladius.

2.' Bearers or socket-,plates F or G, grooved te t the under side of the corrugated curved beams B M, in combination with blocks or saddles O or C', groove-d to fit upon the upper side of said beams, whensaid-bearers andV blocks are placed in pairs, upon opposite sides of 1the superimposed beams B M, and are connected and secured by transverse tie-bolts I or E, substantially in the manner and for the purpose herein set forth.

Witnesses: R. MONTGOMERY.

DAVID A. Bunn, H. H. YOUNG.

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