. Electric railway journal . ■4^ - ji- ■- □□□*□ ET ! I CONCRETE AREA CONOUIT >■ CONCRETE REG 0 PER DUCT FT. CU F7. Fig. 2—Cross Sectionsof Multiple Tile andMonolithic Duct are shown by curves in Fig. curves were plotted fromresults obtained in actually lay-ing a considerable quantity ofeach type of conduit under thesame supervision and by thesame men. The multiple-ducttile was laid with a 3-in. armorof concrete and with the inter-stices between the tiles filledwith fine concrete, while themonolithic conduit was provid-ed with 2^/2 in. of concrete be-tween the
. Electric railway journal . ■4^ - ji- ■- □□□*□ ET ! I CONCRETE AREA CONOUIT >■ CONCRETE REG 0 PER DUCT FT. CU F7. Fig. 2—Cross Sectionsof Multiple Tile andMonolithic Duct are shown by curves in Fig. curves were plotted fromresults obtained in actually lay-ing a considerable quantity ofeach type of conduit under thesame supervision and by thesame men. The multiple-ducttile was laid with a 3-in. armorof concrete and with the inter-stices between the tiles filledwith fine concrete, while themonolithic conduit was provid-ed with 2^/2 in. of concrete be-tween the ducts and the bottomand sides of the trench, witha cover or top 3 in. thick. Theitems of trenching, refilling andrepaving are nearly constantfor each type of conduit, ex-cept a small differential ofabout y2 cent per duct-foot infavor of monolithic conduit, due to the smaller trench andconsequent reduced excavation and hauling of displacedearth required by the monolithic construction. Typicalcross-sections of multiple-duct tile and monolithic conduitare shown in Fig. 2. The construction of monolithic conduit involves only thecomparat
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkmcgrawhillp
