. Railroad construction. Theory and practice . t, which tends to make the total cost per footconstant. Specifications generally say that the piling will bepaid for per lineal foot of piling left in the work. The wastageof the tops of piles salved off is always something, and is fre-quently very large. Sometimes a small amount per foot ofpiling sawed off is allowed the contractor as compensation forhis loss. This reduces the contractors risk and possibly reduceshis bid by an equal or greater amount than the extra amountactually paid him. FRAMED TRESTLES. 135. Typical design. A typical design fo
. Railroad construction. Theory and practice . t, which tends to make the total cost per footconstant. Specifications generally say that the piling will bepaid for per lineal foot of piling left in the work. The wastageof the tops of piles salved off is always something, and is fre-quently very large. Sometimes a small amount per foot ofpiling sawed off is allowed the contractor as compensation forhis loss. This reduces the contractors risk and possibly reduceshis bid by an equal or greater amount than the extra amountactually paid him. FRAMED TRESTLES. 135. Typical design. A typical design for a framed trestlebent is given in Fig. 69. This represents, with slight variationsof detail, the plan according to AA^hich a large part of the framedtrestle bents of the country have been built—, of those lessthan 20 or 30 feet in height, not requiring multiple story con-struction. 136. Joints, (a) The mortise-and-tenon joint is illustrated in 158 RAILROAD CONSTRUCTION. § 136. Fig. 69 and also in Fig. 66 (a). The tenon should be about. FiCx. 69. AA/\^ \\^
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