Highway Construction in Wisconsin.

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1903 Excerpt: ... layer covering Bent combined curb.,'nict the curb and gutjhould be reversed It is a fundamental /jt our most experienced I do not believe, however, that all of the streets should be covered with the same thickness of broken stone. In many places a thickness of ten or twelve inches is unnecessary and entails upon property holders an undue expense. The telford pavement on West Washington avenue was made the same thickness on the top of the hill as it was on the low ground near the railroad tracks. It is evident, however, that the avenue between Carroll and Henry streets did not require a telford foundation. Further, if nine inches of macadam is considered sufficient for the soft ground between Bassett and the Illinois Central Railway tracks, it is reasonable to suppose that a less thickness would be sufficient between Carroll and Henry streets. The thickness of a macadam pavement should be regulated according to the location of the street, the kind of subsoil and the amount of traffic. Third.--The screenings with which a macadam pavement is finished should be spread to a thickness of at least one half inch. This is not usually done in constructing Madison pavements. Sufficient screenings should be used to fill the interstices in the layers of coarse, broken stone, and leave a thin layer covering the surface. Fourth.--Since the city adopted the cement combined curb and gutter, it has been the policy to construct the curb and gutter before laying the macadam. This order should be reversed if it is expected to obtain the best results. It is a fundamental principle in street construction, taught by our most experienced engineers, that gutters should always be constructed after a macadam pavement is completed. The street should not be made to conform to the line ...