This historic book may have numerous typos and missing text.
Purchasers can download a free scanned copy of the original book
(without typos) from the publisher. Not indexed. Not illustrated.
1919 Excerpt: ...rapidly if piles are distributed on the ground in
advance. After driving the piles, the ties are respaced as well as
is possible and guard timbers are relaid, cutting out the spacers
where necessary. When the bridge crew arrives at a bridge where the
piles have been driven as above, the first step is to straighten
and line up the piles. This may be done with jacks and steamboat
ratchets and the piles should be held in position. If badly out of
line this work should be done with the pile driver before it is
moved from the job. After marking the grade, usually obtainable
from the track, and attaching a guide board the piles are cut off.
The stringers and deck are then raised about two inches on the old
caps to permit the placing of new caps. The cap is brought in,
swung off the deck on to the top of the piles and drifted in place.
Sway bracing is next put on and bolted up. With high bents, say
over 20 ft., some longitudinal bracing should be put on as the
stringers are placed. As soon as two or more caps are in place
measurements for the length of the stringers are obtained and the
framing of stringers can be started. This should be done on a level
stretch of ground as near the bridge as possible and consists in
cutting to length, sizing to depth over the caps, and boring for
drift bolts where they are used. Holes may also be bored through
one line of stringers in each chord for packing bolts. Methods of
assembling stringers into chords are varied. In most cases one
chord is changed out completely before the other one is disturbed.
Information in regard to the methods described below was furnished
by E. M. Grime, supervisor of bridges and buildings of the Northern
Pacific at Dilworth, Minnesota, and applies to chords with three
stringers. All bolts are remove...
|Country of origin:
American Railway Association
||246 x 189 x 4mm (L x W x T)
||Paperback - Trade
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