. Text-book on roads & pavements . Fig. 39. The best method is to place a bed of concrete under it.This construction is. shown in Fig. 39, which repre-sents the method used in setting granite curb in Wash-. FiG. 40. ington, D. C. The curb is held firmly in place by theconcrete foundation, which joins it rigidly to the road-way pavement. Where the concrete foundation is not used under 312 A TEXT-BOOK ON ROADS AND PAVEMENTS. the curb a deeper curbstone is necessary, usually from18 to 24 inches in good work. Curbs are very com-monly set in the natural ground, the pavement comingagainst it on one
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. Text-book on roads & pavements . Fig. 39. The best method is to place a bed of concrete under it.This construction is. shown in Fig. 39, which repre-sents the method used in setting granite curb in Wash-. FiG. 40. ington, D. C. The curb is held firmly in place by theconcrete foundation, which joins it rigidly to the road-way pavement. Where the concrete foundation is not used under 312 A TEXT-BOOK ON ROADS AND PAVEMENTS. the curb a deeper curbstone is necessary, usually from18 to 24 inches in good work. Curbs are very com-monly set in the natural ground, the pavement comingagainst it on one side; but it is usually found advan-tageous to lay them upon a bed of gravel or brokenstone, with gravel filled in the trench about them.The ordinary method of setting curbs is shown inFig. 40. The Washington specifications for ordinary workrequire that a bed of gravel 4 inches deep be usedunder the curb, and that the trench be filled withgravel placed in layers 3 or 4 inches deep, each layerbeing thoroughly raimned before adding the next. CONCRETE CURBS. Concrete curbs are extensively used, and their use israpidly increasing, particularly in those sections wheresuitable natural stone does not occur