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THE BERLIN IRON BRIDGE COMPANY,
CONCRETE BRIDGES—Continued.
T^ ERE WE have a construction equal to the best stone arch for spans of over 25 feet, and giving unlimited water-way—a plan which
1^7 commends itself to the careful consideration of towns in want of something more permanent than an ordinary iron highway
bridge with a wooden floor.
On page 53 we show the details of construction of a concrete bridge, such as we would use in spans of from 30 to 60 feet. The
main girders are placed lengthways of the bridge, resting directly upon the abutments, and between these are placed floor beams, about
every 12 or 15 feet apart, upon which rest the stringers, which carry on their lower flanges the corrugated iron arches. Upon these
corrugated iron arches we put the concrete, with asphalt covering, the same as noted on page 50.
For locations where there is a walk on one or both sides, we extend the girders at the curb line up through the concrete, in such a
way as to form a curb line between the roadway and the sidewalks, raising the sidewalks from six to twelve inches, as required. In some
cases we put a lattice railing between the roadway and the sidewalk, but it is very seldom that this condition is required.
We have built over 30,000 square feet of these concrete bridges in the last twenty years, at Bangor, Me., Norfolk, Conn., Westerly,
R. I., Stonington, Conn., Enfield, Conn., Taunton, Mass., New Britain, Conn., Castletown, Vt., Bristol, Conn., Torrington, Conn ,
Brockton, Mass., Berlin, Conn., and several at Waterbury, Conn. All of these are in continual use for heavy traffic, and every one is
giving entire satisfaction. We do the whole work ourselves, including the concrete filling and the asphalt covering, with our own
men and our own tools. After an experience extending over the past twenty years, and a long series of expensive experiments, we
are satisfied that we have arrived at a correct mixture of concrete and asphalt for this class of work, which will stand all time.
When.desired, instead of using an asphalt covering over the concrete, we can put on a granite block pavement, the concrete
being arranged to receive this. One of the bridges which we have built at Brockton, Mass., is completed in this way.
EAST BERLIN, CONNECTICUT, U. S. A. |
