. Electric railway review . Slop&JZ lYooc/ orF/f,/fings Elgin-Belvidere Construction—High-Tension Wall Insulator In Sub-station. placed in position. As the concrete was applied the archadjusted itself gradually to its final form, the joints betweenthe sections were closed up and properly pointed and theconcrete was left to set. The superstructure was next com-pleted in the usual manner by using wooden forms for thespandrel and cross-walls and floor slab. In order to observe the settlement of the arch ribs causedby the dead weight of the structure elevations were taken. Elgln-Belvidere Construc
. Electric railway review . Slop&JZ lYooc/ orF/f,/fings Elgin-Belvidere Construction—High-Tension Wall Insulator In Sub-station. placed in position. As the concrete was applied the archadjusted itself gradually to its final form, the joints betweenthe sections were closed up and properly pointed and theconcrete was left to set. The superstructure was next com-pleted in the usual manner by using wooden forms for thespandrel and cross-walls and floor slab. In order to observe the settlement of the arch ribs causedby the dead weight of the structure elevations were taken. Elgln-Belvidere Construction—Method of Anchoring Trolley Polesin Soft Ground. the walls and floor were concreted the uniform settlementwas but .34 inches, which corresponded in effect to a live loadof 3,200 pounds per lineal foot. It was also observed that thesettlement occurred immediately after the concrete wasplaced and before it had set. No settlement was observed atthe piers and abutments. Although the method of erecting the arch ribs wasemployed here for the first time, the entire superstructureof the bridge, including walls and floor, was completed inthe course of 30 days, notwithstanding the fact that there wasserious delay in getting sufficient labor. It is not probablethat this result could have been obtained with the ordinarymethod of building arches by means of wooden centering. The bridge was designed for a live load of 1,800 poundsper lineal foot and will carry a train of two 40-ton cars witha factor of safety of five. The track over this bridge is bal-lasted with 6 in
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectstreetr, bookyear1906
