The Cairo bulletin. [volume] (Cairo, Ill.) 1872-1878, 1878-02-01
NOTICE TO CONTRACTORS.
OFFICE OF CITY CLERK, |
trn tle Ian q 1919

Sealed proposals " I'll be received ut this
odice, directed 10 the city council Of CslrO,
Illinois, until 3 o'clock Tuesday evening,
February 9th, A. ID. 1878, tor the coDstTuc-
tion OF q one span iron bridge, together
with The approaches or sbntrnents anu
ioWadatiOn, across Cache river, about one
and one. all miles from Mound City raj.
road depot, aGd four miles north OF the city
Of Cairo, iD the counties Of Alexander and
Pulaski, state OF Limos, sccorcing 10 The
plans unt specifications prepared by J ,bn
=. HeIy, ESQ.,, q. f., now Ons tie and sub
100. TO examination IN this Oiice, tue spect.
6c,tions of which are a. follows, viz:
Said bridge and trestle work lie made
up Of eighteen iiS) op ninga OF eight en- tlSl
feet irom centre 10 centre OF Pc IL, and one
span OF one hun lrsd ,lV0) feet acro.s the
river bed.
The one hundred COO ieot span +, be OF
ron, aud 50 proportional tina. losi o! ten
(lOl tens dist ihuted over twenty tl0l linea!
leet At the centre Of the span, shall no.
strain the iron over twelve thousand
IA UO0) pounds per square inch tensile, or
over seven thousand i've hundred Il 5i0)
pounds per square inch sheariDg strain
the strain in compies ion TO be IN az,
lea / In the proportion 20 the ratio OF
length TO diameter. 10y GordOn's formula.
Tue span OF said bridge to be one hun
dred (l0Dl teet in the clear and the roadway
twelve u2) feet wide.
The floor to bo Of white oak PLANK two
and oae-hali en- inches thick and not over
twelve ti2) inches vide.
Tbs floor beams TO be OF white oak and Ia
| prOpOr,ion 10 the bslsnc, Of TIC one hun.
Dire. lll0) feet span structure, and also 10
be provided with a suitable axle guard.
The a0 We TO rest upon iron Columns pro-
pJitioned 10 the structure to be supported,
| the columns at each end OF the bent or IRON
| span 10 be- placed on q mud sill 'yNl2, TWEEN.
| ~ COY feet long mOrticed ard teuonon :, Q
suiicielt number Of white OAK Plies, firm.
| iy driven into the river bank.
1REsTLE WORK.
| The bents to b. formed Vi tour p0s.s l0Yl0
INCHES square, the TWO inner parts TO stand
| perpendicular and the Two outer part u
| Ds framed and stand a. batter OF one in
eight. The cap aad sill OF the bsnts to be
| I2Ai2 inca square timber, tlo caps to be
| twenty (2Jl feet long, and the stills to pro-
Gsl pp. elAasJp ysRa Twp iast rne' b6sa.qD'ds
MOI ticed and tenoned into the caps and stills
and each tenon TO be pinned with two
| tbree-quarter y inch square iron pirs, and
| each bent to be braced By two diagonal
braces OF l2X2i inch plank, well fitted and
spiked on caps, posts and sils.
The bents 10 rest or stand Il pom four mad
| sills loXl2 Inches and eight ts) feet long set
| in the ground and placed on the alignment
| Of the work.
The carriage way Of the ::trestlework 10
be sixteen (lb) feet wide, the door plank
be three t3j inches and not over twelve
| Q2) inches wide, and TO be well spiked on
to the stringers aud ilO0r beams.
! The floor beams to he made up as follows
two t2) stringers Of 8Xl2 inches set on the
caps and sixteen (l6) ieet apart from out
| side to outside. The space between said
stringers TO DO equslly divided for sever
| (7) beams of Okla inches each and each se
OF floor beams or spans TO have three ts) sets
orheringbons bridging OF AKA inch scant
| hing.
The stringers and soor beams to rest q
! least Xix l6) inches On The caps.
| The striDgsrs to connect by half joints
and 10 be fastened to the caps by one inch
round spikes or bolts eighteen (1S) inche.
long.
A raiiog or ballss,ers four ~ feet hizl
n no constructed Oh each side OF above dis,
cribed trestlework. lhs POSTS to be AXE
inch clees and brseed on the caps and faste1,
ed on TO the 81, ingers by two ~ one. bali
Inch bots. The parts TO DO six (6) tee,
apr; the hand rail Ak inches, and ar
axle guard OF TX inches, ali we'll taste neC
Oh TO the posts.
All OF the above tinbers to be OF white
| or burr oak OF hes. qua itty. Ant,
the work done In thorough and work
manlike N inner, and upder the supervision
| OF suoh rsrs0n IS the committee on streets
or tho city council OF tho city O! Cairo NAV
| designate.
Tho approaches to above trestle work and
bridge to DO OF earth and with o sop, OF
NOT more than one In ten and not le than
sixteen Q6) teet wide on Top, with q slope
TO the base Of one in two, seper ito bid.
VIII be received for iron span, including
abutlnents an foundation, for The wood n
ucstle portion OF said bridge, and for the
earthen approaches, or FIR the entire
! work.
Tho RICH, to reject any or all hlds, IL re-.
setved' Il. PRILIIs,
uIu. CT v Gle K