BRIDGE OVER THE RIVER ADIGE, AT VERONA.

BRIDGE OVER THE RIVER ADIGE, AT VERONA.

The iron bridge which spans the Adige at Verona, of which we publish illustrations, has been recently completed to replace an old masonry bridge built in the fourteenth century, and which was destroyed by the celebrated flood of 1882. In designing the new work two leading conditions had to be fulfilled, namely, that there should be a single opening of 291 ft. between abutments, and that this width should be left quite unobstructed, for the river is subject to floods, which are frequent, and very violent and sudden. For this latter reason an ordinary form of arch, with the roadway above it, was inadmissible, since the waterway would be seriously obstructed; the special form illustrated was, therefore, carried into execution. The bridge, as will be seen from Figs. 1, 2, 3, and 7, consists of two main arched girders, with two vertical sides in lattice work; these arches spring below the level of the roadway and rise to a considerable height above it, in the center. The horizontal girders carrying the roadway, are connected to the arches by verticals of the form and section shown in the drawings.

The longitudinal girders are of double trellis, as will be seen by reference to Figs. 1, 12, and 16. The following are the principal dimensions of the bridge:

 Ft. In.

Clear opening between abutments 291 4

Rise of arch 32 9¾

Width of bridge 37 4¾

Depth of arched girders 4 7 

The arched girders are connected together, in the central portion, by a system of diagonal bracing, as is shown on Figs. 2 and 7. The carriage road on the platform consists of buckled plates resting on transverse girders spaced 6 ft. 6 in. apart, and covered with road metal, and for the sidewalks checkered plates are used. The ironwork in the bridge weighs 400 tons, and cost 8,400 l.; the abutments cost 3,600l., making the total outlay on the structure 12,000l. The bridge was tested by a uniformly distributed load of 82 lb. per sq. ft., and under this stress the arched girders deflected 1.06 in. The horizontal and vertical oscillation of the bridge, which were carefully observed and graphically recorded by special instruments, were very slight. The engineer of the work was Mr. G.B. Biadego, of Genoa. - Engineering.

BRIDGE OVER THE RIVER ADIGE, AT VERONA.

BRIDGE OVER THE RIVER ADIGE, AT VERONA.