. Engineering and Contracting . that the public gets adequateservice, rendered at a fair price and compensatory remuner-? atipn. Methods and Costs of Constructing Tunnel for Heating and Power Lines Several years ago a tunnel about ft. long was con-structed from the power plant on the campus of the Univer-sity of Colorado, Boulder. Colo., to the northwest corner ofthe old engineering building. This tunnel carries steammains and returns for heating the buildings and electric linesfor light and power. During the summer of 1919 the tunnel system was prac-tically doubled in length by the addi
. Engineering and Contracting . that the public gets adequateservice, rendered at a fair price and compensatory remuner-? atipn. Methods and Costs of Constructing Tunnel for Heating and Power Lines Several years ago a tunnel about ft. long was con-structed from the power plant on the campus of the Univer-sity of Colorado, Boulder. Colo., to the northwest corner ofthe old engineering building. This tunnel carries steammains and returns for heating the buildings and electric linesfor light and power. During the summer of 1919 the tunnel system was prac-tically doubled in length by the addition of ft. of tun-nel. The location of the old and new tunnels is showTi inFig. la. The tunnel extension was designed by W. C. Hunt-ington, Professor of Civil Engineering, and W. E. Brockway,Instructor in Civil Engineering, of the University of Col-orado, and was constructed by force account under theirdirection. The work is described by Messrs. Huntington andBrockway, in Vol. XVI. No. 1, of the University of Colorado. Figs. 1a and lb—Map Showing Location of Tunnel and Profile. Journal of Engineering, from which the matter in this articleis abstracted. The Old Tunnel.—The old tunel was built in 1909. Theform of cross section is shown in Fig. 2a. It was not rein-forced, the roof was not waterproofed and the drain underthe floor was only 6 in. in diameter. For these reasons thetunnel has been unsatisfactory on account of cracking, leak-mg of the roof and insufficient drainage capacity. It is, how-ever, serving its purpose fairly well, and except for one sec-tion will probably never need to be replaced. The sectionwhich will have to be replaced at an early date is near theeast end. Here the part of the tunnel section rested on filledground which has since settled, causing dangerous condition would have been much better today if reinforce-ment had been provided, but even then cracking woulddoubtless have occurred unless precautions had been takento prevent set
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