The Cairo bulletin. [volume] (Cairo, Ill.) 1872-1878, 1878-01-27
NOTICE TO CONTRACTORS.
OFFICE OF CITY CLERK,
Cairo. Ills. Jan. 4. 1873.

NoiAo, aiis., Jan. q, iOic' !
Sealed proposals will be received at this
office, directed to the city council of Cairo,
Illinois, until O'Clock Tuesday evening,
February 9th. A. ID. 1878, for the construc'
ton OF q one span iron bridge, together
with the approaches or abutments and
foundation. across Cache river, about one
and one. ,ali miles from Mound City raj
road depot, and four miles north OF the city
Of Cairo, In the counties Of Alexander and
Pulaski, state OF Illinois, according 10 the
plans ind specifications prepared by John
2. Hely, Esq, Z. E., now on file and sub
ject to examination IN this office, the speci.
ticatious of which are a. follows. viz:
Said bridge and trestie work 10 be made
up of eighteen iis) optD ings OF eight EN- 49,
feet from centre TO centre OF posts, and one
span OF one hun ired 900 feet across the
river bed.
The one hundred 1907 feet span T., be of
iron, and 80 proportloned that a load OF ten
ll0) tons dist ibuted over twenty (20) lfneal
feet ut the centre OF the span, shall not
strain the iron over twelve thousand
~. 600 pounds per square inch tensile, or
over seven thousand five hundred & 5lWJ
pounds per square inch shearing strain
the strain in compression TO be in at,
least in the proportion - the ratio OF
length to diameter, by Gordon's formula
The span OF sal bridge to be one hun
dred llOU) feet in the clear and the roadway
twelve az feet wide.
The floor to be OF white oaE papL two
and one-hslt i2!l inches thick and not over
twelve 49, inches wide.
The moor beams TO be OF white osk and ia
proportion TO the balance Of the one hun.
| drea ilCOJ feet span structure, and also 10
| be provided with a suitable axle guard.
har 20 irrn onl,
portioned 10 the structure to be supported.
! the columns at each end OF the bent OF iron
span TO be placed on a mud ill l2Xl2, TWEEN.
| ~ 90 feet long mOrtlced and tenOned 10 a
sufficient number OF white oak piles, lirm.
| IL driven into the river bank.
IREsVLE WORK.
| The bents 10 he formed oifOur posts i0N 0
| Inches square, the Two inner psrts TO stand
perpeGdlcuiir and the two outer parts TO
| be framed and stand at batter OF Ole in
| eight. The cap and sill OF the bents TO be
| l2Nl2 inc1 square timber, t10 caps 10 be
twenty i2>) feet long, and the sllls 10 pro-
ject on each end two feet past the outer
edge of the outside posts. The posts to he
mofticed and ten0ncd into the caps and sili-,
and each tenon to be pinned With two
| tbree.quarter CD inch square iron pirs, and
each ben. 10 be braced by two diagonal
| spiked on caps, posts and sils.
! The bents to rest or stand upon four mud
sills l2Xl2 inches and eight Isl feet long set
in the ground and placed on the alignment
! Of the work.
The carriage way Of the ,tres,lework to
| be sixteen (lGJ feet wide, the floor plank
10 be three (3j inches and not over twelve
| az inches wide, and to be we'll spiked on
TO the stringers and floor beams.
The floor beams TO be made up as follows
two ~ stringers of SXl2 inches set on the
caps and sixteen (l9) feet apart from out.
side TO outside. The space between said
stringers to be equally divided for seven
| O. beams of 3X12 inches each, and each set
of floor beams or spans to have three (S) sets
o. herfinsbons bridging OF PA inch Scant-
ling.
| The stIipgers and floor beams to rest at
least six l6l inches on the caps.
| The stringers to connect by half JOINTS
| and TO be fastened TO the caps by one inch
round spikes OF bolts eighteen u.s. inches
long.
A railing or ballasters four a. feet high
to be constructed on each side of above dis
cribed trestlework. The posts to DO 4X6
inch clees and braced on the caps and fasten.
cd on to the striDgers by two ~ one.half
inch bolts. The parts TO be six l6) feet
apart: the nanu rail- I'M lnches, ana an
axle guard 2Xl2 inches, all we'll fastened
on to the posts.
All OF the above timbers to be OF white
or bur oak Of bes. qua lity, and
the work done in thorough and work
manliks manner, and under the supervision
Of such person as the committee on streets,
or the city council OF the city Of Cairo may
designate.
The approaches to above trestlework and
bridge to be Of earth and with q slope oil
not more than one in ten and not less than
sixteen (l8) feet wide Oh top, with q slope
10 the base OF one In two. Separate bids
will be- received for iron span, including
abutments and foundation, for the wooden
treste portion Of said bridge, and for the
earthen approaches, or for the entire
work.
The right to reject any or all bids, is re.
fterved. j. .. PHILLIs,
dtd. City Clerk.