. Railroad structures and estimates . -ft- •• I to — -3 c - _ 5-, S §~ ? =-i i d -- f iii? » ■ — ( — - ^ « -J- -_ ^ UJ en _! TURNTABLES. 543 The C. C. & 0. Ry. standard turntable pit is shown in Fig. turntable is one hundred feet in length of the plate girdert3rpe. The entire foundation is built of concrete reinforced withold rails. Two kinds of center pier foundations are given, type^A for firm earth and type B where piles are floor of pit is finished with paving brick laid on -edge andgrouted in cement. Drainage is provided by grading the floor ofthe pit to a
. Railroad structures and estimates . -ft- •• I to — -3 c - _ 5-, S §~ ? =-i i d -- f iii? » ■ — ( — - ^ « -J- -_ ^ UJ en _! TURNTABLES. 543 The C. C. & 0. Ry. standard turntable pit is shown in Fig. turntable is one hundred feet in length of the plate girdert3rpe. The entire foundation is built of concrete reinforced withold rails. Two kinds of center pier foundations are given, type^A for firm earth and type B where piles are floor of pit is finished with paving brick laid on -edge andgrouted in cement. Drainage is provided by grading the floor ofthe pit to a catch-water basin near the center, which connectswith the drain. Where piles are used they must be below waterlevel, or creosoted. The Virginia Ry. standard pit is shown in Fig. 260. The turn-table is a plate girder design one hundred feet in length. Thefoundations throughout are built of concrete and are supportedon piles where the engineer so directs. The concrete is reinforcedwith one-inch round steel rods, when the foundations extend torock the rods are omitted. The floor of the pit is finished in con-crete dished to dra
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