. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools . Fig. 73. §171. TRESTLES. 207. ,\-^ ;(a) , o o 6 c oo oo a o o (b) Fig. 74. apply with even greater force to (6) is bent and used as shown in Fig. 74 (a). Bolts passingthrough the bolt-holes ^.T- shown secure the platesto the timbers and makea strong joint which may-be readily loosened for re-pairs. By slight modifi-cations in the design themethod may be used forinclined posts and compli-cated joints. (d) Split caps and are described in§ 161. Their advantages
. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools . Fig. 73. §171. TRESTLES. 207. ,\-^ ;(a) , o o 6 c oo oo a o o (b) Fig. 74. apply with even greater force to (6) is bent and used as shown in Fig. 74 (a). Bolts passingthrough the bolt-holes ^.T- shown secure the platesto the timbers and makea strong joint which may-be readily loosened for re-pairs. By slight modifi-cations in the design themethod may be used forinclined posts and compli-cated joints. (d) Split caps and are described in§ 161. Their advantagesframed trestles. (e) Dowels and drift-bolts. These joints facilitate cheap andrapid construction^ but renewals and repairs are very difficult, itbeing almost impossible to extract a drift-bolt, which has beendriven its full length, without splitting open the pieces contain-ing it. Notwithstanding this objection they are extensivelyused, especially for temporary work which is not expected tobe used long enough to need repairs. 171. Multiple-story construc-tion. Single-story framed trestlebents are used for heights upto 18 or 20 feet and exce
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