perpendicularly to the plane ofj^he bridge seat, and the 
anchor bolts shall be se " 
SPECIFICATIONS FOR STEEL HIGHWAY BRIDGES. 13 
The results obtained in the field assembling and rivet- 
ing of the members of a stiTicture shall conform to the 
requirements for shop assembling and riveting. Field- 
driven rivets shall be inspected and accepted before being 
painted. 
Field riveting shall be done before the falsework is 
removed, unless special permission to the contrary is 
given by the engineer. 
Railings shall not be riveted until the falsework has 
been removed. 
All nuts on pins shall be thoroughly tightened and the ^so. Adjustment 
pins so located in the holes that the members shall take ° ^'^ °" ^' 
full and even bearing upon them. 
Anchor bolt holes shall be drilled in correct locations J>'^- s®"i°s an- 
chorage bolts. 
set in Portland cement mortar 
therein. The mortar shall consist of one part cement to 
one part clean, fine-grained sand mixed sufficiently wet 
to flow freely. 
Anchor bolts shall first be dropped into the dry holes 
to assure their proper fit after setting. They shall then 
be set as follows: Fill the hole about two-thirds full of 
mortar and by a uniform, even pressure or by light blows 
with a hammer (flogging and ramming will not be per- 
mitted) force the bolt down until the mortar rises to the 
top of the hole and the anchor bolt nut rests firmly 
against the metal shoe*.or pedestal. Remove aU excess 
mortar which may have flushed out of the hole, to permit 
proper field painting of the metal surfaces. 
The location of the anchor bolts in relation to the 
slotted holes in expansion shoes shall be varied with the 
prevailing temperature. The nuts on anchor bolts at 
the expansion ends of spans shall permit the free move- 
ment of the span. 
Anchor bolts which are to be set in the masonry prior 
to the erection of the superstructm-e shall be carefully 
set to proper location and elevation with templets or by 
other suitable means. 
MEASUREMENTS AND PAYMENTS. 
The con ract price for fabrication and erection of struc- 52. b a s i s of 
tural steel shall include all labor, material, transportation P^y^^nt. 
and painting necessary for the proper completion of the 
work. 
Payment will be made on a pound-price or a lump-sum 
basis, as required by the terms of the contract. For the 
pm'pose of payment, such minor items as bearing plates, 
pedestals, etc., shall, unless otherwise provided, be con- 
sidered as structural steel even though made of other 
materials. 
Payment for all material used in full-sized tests shall be 
made on a pound-price basis for pound-price contracts 
and, unless otherwise provided, on a basis of actual cost 
plus 10 per cent for lump-sum contracts. The scrap 
