The Cairo bulletin. [volume] (Cairo, Ill.) 1872-1878, 1878-02-05
NOTICE TO CONTRACTORS.
OFFICE or CITY CLERK,
CAirn. Ills Ian z. 1919.

SahoS ailoss vuus O, iOtc, j
Sealed proposals will be received at this
office, directed to the city council Of Cairo,
Illinois, until D O'Clock Tuesday evening,
February 5th. A. ID. 1878, for the construc-
ton OF one span iron bridge, together
with the approaches or abutments and
foundation, across Cache river, about one
and one ,af miles from Mound City rail-
road depot, and four miles north OF the city
of Cairo, in the counties of Alexander and
Pulaski, state OF Illinois, according to the
plans lnd specifications prepared by John
i. Hely, Esq, Z. f., now on file and sub
ject to examination in this Office, the speci.
icalions of which are a. follows. viz:
Said bridge and trestle work 10 be made
up Of eighteen tisl ope nings OF eight en- tisl
feet from centre to centre OF 20 IL, and one
span OF one ntred tl00) feet across the
river bed.
The one hundred (ioO) feet span N DO of
iron, and 30 proporhoned that load OF ten
(1O) tons dist ibuted over twepty (2O) linesi
feet at the centre o. the span, shall not
strain the iron over twelve thousand
| ~ 000) POUNDS per square inch tensile, or
over seven thousand i've hundred Il 5n0)
pounds per square inch shsaring strain
tho strain in compression TO be In AZ,
lest In the proportion to the ratio Of
length to diameter, by GordOn's formula.
The span OF sai d bridge to DO one hun
drei tl0O) feet In the clear and the roadway
twelve ll2) feet wide.
The door to be OF white oak plank two
and oLe.half (2i) inches thick and not over
| twelve (i2) inches vide.
| The floor beams TO be OF white oak and In
| proportion TO the balance of the one hun.
dre1 IL o. feet span structure, and also to
| be provided with a suitable axle guard.
The alb We to rest upon iron columns pro-
porti0ned 10 the structure to he supported,
| the columns at each end OF the bent or iron
span to BIZ placed on mud sill .2Xl2, twen-
" (20) teet long mortlced aud teDOned t. a
sufficient number Of waite oak plies, firm.
ly driven into the river tank.
1REsTLE WORK.
The bents TO be- formed OF four posts l0Xla
inches square, the Two inner parts TO stand
perpendicular and the Two outer parts to
Oe framed and stand at batter Of one in
eight. The cap and ell Of the bents to be
| l2Xi2 inca square timber, TIE caps " DO
twenty COY feet long, and the stills 10 pro-
ject on each end two feet past the outer
edge Of the outside posts. The posts to be
mo ticed aud tenoned into the caps and stills,
and each tenon 10 be pinned with two
tbree.quarter % inch sQusre iron pirs, and
each bent tn be braced ny two diagonal
braces OF l2X2A inch plank, well ftte and
spiked on caps, posts and sllls.
The bents to rest or stand u pom four mud
sills l2X12 inches and eight 49, feet long set
In the ground and placed on the alignment
Of the WORK.
The carriage way Of the :trestlework to
be sixteen (lH) feet wide, the floor plank
70 be three t3) inches and not over twelve
(12) inches wide, and to be well spiked on
10 the striDgers and floor beams.
l Tha floor hpama In hQ MI do n N fo llnCa .
two (2) stringers Of 8Xl2 inches set on the
caps and sixteen (l8) ieet apart from out
side to Outside. The space between said
stringers to be equsily divided for seven
(7) beams of 3Xl2 inches each and each set
Of floor beams or spans to have three (S) sets
OF berhngbons bridging OF 2X4 inch scsnt-
ling.
The stringers and floor beams to rest ut
least Xix (8) inches on the caps.
The stringers to connect by half joints
and 10 be fastened to the caps by one inch
round spikes or bolts eighteen (l6) inches
long.
A railing or ballasters four (4) feet high
to be constructed on each side OF above dis
cribed trestlework. The posts to be Axe
inch clees and braced on the caps and fasten-
ed on to the tIingers by two (2) one.hslf
inch bolts. The parts to be six 10y tset
apart; the hand rail 2X4 inches, and an
axle guard Of 2X'2 inches, all well fastened
on TO the posts.
All Of the above timbers to be OF white
or burr oak Of bos. qua lily. and
the work done In thorough and work
manlike m inner, and under the supervision
Of such person as the committee on streets,
or the city oouncil Of the city OF Cairo may
designate.
| The approaches TO above trestlework and
bridge to be OF earth and with Q slope OF
not more than one In ten and not les than
sixteen (l6) feet wide on top, with slope
10 the base Of one In two. Separate bids
Will be received for iron span, including
abutments and foundation, for The wOode n
trestle portion Of said bridge, and for the
earthen approaches, or for tho entire
work.
The right to reject any or all bids, Is 70.
served. j. B. PHILLIs,
| dtu. Civ Clerk