The Cairo bulletin. [volume] (Cairo, Ill.) 1872-1878, 1878-01-25
NOTICE TO CONTRACTORS.
OFFICE OF CITY CLERK,

OFFICE OF CIIl OLHRh,
Cairo, Ills, Jan. 8, 1873.
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 one span iron bridge, together
with the approaches or abutments and
foundation, across Cache river, about one
and one. nali 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 10 the
plans and speciti cations prepared by John
p. Hely, Esq, &. E., now on tile and sub
ject to examination IN this office, the speci.
fications of which are Is follows, viz:
Said bridge and trestie work o be made
up of eighteen Qs) openings OF eighteen (lsl
feet from centre to centre OF posts, and one
span OF one hun dred 900 feet across the
river bed.
The one hundred (l00) feet span to be OF
iron, and 10 proportional thata load OF ten
10y tons distributed over twenty (20) lineal
feet at the centre OF the span, shall not
strain the iron over twelve thousand
az, OO0) pounds per square inch tensile, or
over seven thousand FIVE hundred q 5lO)
pounds per square inch Phearing strain
the strain In compression 10 DO IN at,
least In the proportion TO the ratio OF
length to diameter, by Gordon's formula.
The span OF said bridge to be one hun
drej 400 feet in the clear and the roadway
twelve az feet wide.
The door to be OF white oak plank two
and one.half (23) inches thick and not over
twelve (I2) inches wide.
| The floor beams to be OF white oak and In
proportion to the balance OF the one hun
| dfeu 400 feet span structure, and also To
| be provided with suitable axle guard.
The above to rest upon iron columns pro.
portioned TO the structure to be supported
the columns at each end Of the bent or iron
span to be placed on mud sill i2Xl2, TWEEN.
~ 10Y feet long mortified and tenoned to O
sufficient number Of white oak piles, firm.
| " driven into the river bank.
| TRRsTLE WORK.
The bents TO be formed offOur posts 10S Il
inches square, the two inner parts to stanC
perpendicular and tho two outer parts u
be framed and stand at o batter Of one In
eight. The cap and Fill OF the bents TO be
l2Xi2 inch square timber, the caps 10 BIZ
twenty (20) feet long, and the sills to pro.
ject on each end two feet past the ontel
edge of the outside posts. The posts to be
morticed aud tcnoned into the caps and stills
and each tenon to be pinned with two
tbree-quarter ~ inch square iron pins, and
each bent to be braced by two diagons
braces OF i2Xz1 inch plank, well fitted anc
spiked on.caps, posts and stills.
The bents to rest or stand upon four mut
sills 12Xl2 inches and eight (e) feet long 80
in the ground and placed on the alignmen
of the work.
be sixteen ti6) feet wide, the floor plaril
10 be three (3) inches and not over lively
u2) inches wide, and to be well spiked Oh
TO the stringers and floor beams.
The floor beams to be made up as follows
two (2) stringers Of sXi2 inches set on tn
caps and sixteen (l6) feet apart from GU,
side to outside. The space between sal,
stringers TO be equslly divided for seyel
, (7) beams Of 3Xl2 inches each, and each &c
J OF floor beams or spans to have three (s) set
OF herringbone bridging Of 2X4 inch scan,
ling.
The stringers and floor beams to rest
least six (tD inches on the caps.
Tho striDgers to connect by half JOINT
and TO be fastened TO the caps by one inc
round spikes or bolts eighteen nS) incht
long.
A railing or ballsstcrs four az feet hig
. TO be constructed on each side Of above d
= cribed trestlework. The posts to be AZ
Z AuCu SiOCb ohu uibCCu Ou tub capb h0u IbbIel
/ ed on to the stringers by two (2) one.ha
!. inch bolts. The parts TO he six (0) 10,
; apart; tho hand rail 2X4 inches, and q
. axle guard Of aka inches, all well fastens
!. on to the posts.
All OF the above timbers TO be Of viii
}, or burr oak OF best qua lily, ar
the work done In . thorough and wor
{ manlike manner, and under the supervisio
Of such person - the committee on street
= Or the city council Of the city Of Cairo mi
q designate.
4 The approaches 10 above trestlework al
: bridge TO be Of earth and with . slope
!. not more than one In ton and not lesS thu
!! sixteen (l6) feet wide on top, with q slol
y TO the bsse Of one In two, Seperste bi
VIII be received for iron span, includll
n Abutmsnts and foundation, for the wood,
. trestle portion OF said bridge, and for Il
J. earthsn approaches, or for tho emil
: The RICH, to reject any or all bids, 10 I
= served. j, b, ParLIIs.
h oto. City Clerk.
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