The Rock Island Argus and daily union. (Rock Island, Ill.) 1920-1923, 1920-04-17
esntlnusd from preceding pase).

Nsntinued from preceding pase).
concrete from pouring ont beneath
the forms when poured and ram
med in the forms.
Il Forms shall not be removed until |
concrete receives its initial set and |
shall be sprinkled befort concrete
b poured.
Al concrete used IN the construc- !
ton Of said manhOles shall be mix
ed In the same manner and with !
the same mix as hereinbefore de-
scribed In this ordinance for the |
construction OF wingwalls and head |
er walls.
Section vi.
All OF said concrete manholes
herein outlined are to be covered
with q cast iron cover, made OF
strong gray cast iron OF close
grained structure weighing not
less than four hundred fifty (450)
pounds per cubic foot.
The cast iron sholl be tough and
even grain and shall possess ten
sile strength OF not less than eigh-
teen thousand $4,000 pounds per
square inch. All cast iron covers
shall bee lean and perfect without
blow or sand holes or defections Of
any kind and said metal shall be
uniform in quality. soft enough to
permit drilling and cutting and cap
able OF showing indentations from
. sharp blow Of hammer without
talking.
The covers shall be made in two
(2) parts. The outer or ring part
Of the cover shall be six t6) inches
wide and not less, than three
fourths (X) inch thick with an in
side plate two ~ feet in diameter.
The plate or removable part Of the
cover shall be two f2) feet in
diameter and not less than one and
one-half uh) inches thick. All
these manhole covers shall be of
the same size and made in the
same manner as the manhole COW
ers now in use in the sanitary sew
ers in the city of East Moline. A
blue print Of this manhOle cover
is on file in the city clerks Office,
East Moline, Illinois. The outer
part of said manhole cover shall be
securely fastened to the walls OF
said manholes by means of two GU
one-half Oh inch bolts, four a.
inches long with heads above the
cover extending down through two
GU one-half (H) inch holes in said
cover with the bolts firmly fastened
in the concrete, said bolts to be
placed on opposite sides of the
manhole. This part Of the cover
shall be placed on top of the man
hole and the bolts shall be put in
place before the concrete is set.
The manhole covers shall be
strengthened by means of two 90
reinforcing ribs of the same ma
terial as the manhole covers. The
ribs shall be one-half 90 inch
thick and twenty-five t22) inches
long and extend below the manholt
cover one "a inch at distance Of
eleven u1) inches from center O.
manhole cover and distance o
two CD inches at center of manholt
cover and the two (2) ribs shall b.
constructed as an integral part o
the manhole cover and al RICH
angles to each other, both rib
passing through vertical axis o
manhole cover, which is also tn
vertical axis of both ribs.
Two ~ Tugs shall be con
strutted as All integral part of tn
plate or removable part OF tn
nanhole cover, on the bottom of III
same and next to the outside OF sal
y plate at opposite side Of the same
and Tugs shall be one and three
iourths la4) inches long, aud on
E III inch wide and one % inc
thick. with an l. or otngue at tn
end OF same. Said l. is fivc-eight
ia inches long, five-oighths t5s
inches wide and fve-eiehths t *
inches thick. Two slots one u
\ inch wide and one and one-ha
ulaD inches long shall he cut i
the outer ring of malnoie cover
so that when the plate or remoV
able part of cover is set on I'll
outer part, the Tugs will will pas
through the slot SO that the pla,
when turned on its vertical Ak
will be locked TO outer ring /
means OF the l. or tongue on Ii
Tugs being directly under the outt
ring. The manhole covers sha
be roughened by means of knoll
made OF the same material as til
manhole covers and made an il
tegral part therecf. The knot
shall extend Is inch above the sui
face of the manhole cover, shall
one-half (la) inch wide and tw
~ inches in length except tha
knobs next to the outside Of til
plate or ring shall be shortene
where necessary to keep the knob
within one-half % inch of til
said outside OF plate and ring.
The knobs shall be formed
rows, each knob being at rigf
angles to the adjacent knob, on
row passing through the yertics
axis of manhole cover, the remain
ing rows parallel with first row an
two t2) inches apart. center to Ger
ter.
All segment block shall be of til
1 best quality Of vitrifed clay wal
thoroughly burned and salt glaze
and true to form known q
"Streator Segment block" or otht
segment block of as good a grac
/ and quality, and shall be free fro
checks or fire cracks. They sha
be made in two (2) rings so tn;
the blocks of one "a ring will il
terlock with those of the ad;oin!r
\ ring and the longitudinal joints
the one ring will break joints wi,
/ those OF the other ring. The wea
ing surface Of longitudinal join
in the inner ring shall not be le
Than two and one-half i2h) tim,
he thickness of the wearing su
-