. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools, and a hand-book for the use of engineers in field and office . (]::.-^^-.::„ J-==^ FiQ. 73. §171. TRESTLES. ^07. o o b c oo o o o a a Fig. 74.—Joint Plates. (6) is bent and used as shown in Fig, 74 (a). Bolts passingthrough the bolt - holes .--■T7l shown secure the platesto the timbers and makea strong joint Avhich maybe readily loosened for re-pairs. By slight modifi- ^^cations in the design the f~method may be used for | ,-inclined posts and compli-cated joints. (d) Split caps
. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools, and a hand-book for the use of engineers in field and office . (]::.-^^-.::„ J-==^ FiQ. 73. §171. TRESTLES. ^07. o o b c oo o o o a a Fig. 74.—Joint Plates. (6) is bent and used as shown in Fig, 74 (a). Bolts passingthrough the bolt - holes .--■T7l shown secure the platesto the timbers and makea strong joint Avhich maybe readily loosened for re-pairs. By slight modifi- ^^cations in the design the f~method may be used for | ,-inclined posts and compli-cated joints. (d) Split caps and are described in§ 161. Their advantages apply with even greater force toframed 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 fe
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Keywords: ., bookauthorwebbwalt, bookcentury1900, bookdecade1920, bookyear1922
