The Cairo bulletin., 1909-07-26

ginning at the manhole located at the
intersection OF Seventeenth street
and Walnut street, In the Seven.
teenth street sewer at an elevation Of
| nine and ninety-one hundredths (99ll
feet below the top surface Of the
stone monument at the southwest
lcorner of Commercial avenue and
Sixth street. in the said City of Cairo
and from thence the said sewer shall
be laid in a northerly direction. on a
straight line. and shall rise at the
rate of twotenths t2-10) of a foot
per centum to a manhole to be CON
Istructed in the said Walnut street at
point twenty-four (24) feet north of
the south line of Twentieth street,
where the said sewer shall terminate,
and where the elevation of the sail
sewer shall be seven and ninety-eight
one ,hundredths (7.9S) feet below the
top surface of said stone monument
hereinbefore specified.
Section 90. The sewer trenches
shall be carefully and evenly excavat-
ed and with such slants or inclina-
tions In the sides thereof as viii leave
no risk Of caving or falling in, and
where such risk cannot otherwise be
: lavoided, proper snoring must be re-
! sorted to. To enable the workmen to
4, do the work to the best advantage.
both as to the matter of securing a
, proper foundation and for laying the
J pipe, the bottoms Of the trenches
shall be made at least one "a foot
! wider than the external diameter of
the sewer pipe and wider If found
necessary or best and they shall be
, curved or shaped to the form and size
of the lower half of the sewer pipe to
be laid thereon, so that the hubs or
bells as we'll as the body of the pipe
, may be carefully embedded AMI have
an even bearing on the bottom of the
trenches.
Whenever the ground, at the bot
tom OF the sewer trench, .shall not be
found to be sufficiently firm or solid
for the laying Of the sewer pipe, the
same shall be put IN proper and suit
able condition by the contractor by
the use OF such materials as will
make a safe and permanent founIa.
tlon for the work.
Section q. The sewer pipe, housa
connection pipe and inlet pipe shal
be OF the best grade and quality of
vitrified tile sewer pipe, salt glazed
and free from cracks, flaws. bisters
Jumps or other defects or blemishes
and shall be of the hub and spigot
pattern. Both the body and the bell
shall be Of double strength and have
twelfth 1-12l OF the internal diane
ter Of the pipe and the Joint connec.
tions of the pipe shall be fitted tight
and close and laid In the best quality
OF Portland cement mortar, com
posed OF one ti) part OF cement and
one ~ part OF clean sand with cnl-
enough water to give consistency to
the mortar, which shall be used as
soon as made, and before lowering
the joints or pieces Of pipe into
|
fully examined and inspected and
those not meeting the foregoing
requirements shall be rejected and ro
moved from the work The pipes
shall he so laid In the trenches that
after the sewer is completed the into.
rlor surface thereof shall conform ac.
Icurately TO the grade herein given for
the laying of the sewer, and all ad.
liustments to line and grade of pipe,
laid directly upon the bottom OF the
Trench, must be done by scraping
away or filling in with earth and com.
patcing the same under the the body
of the pipe and not by blocking OF
wedging up. Before laying the inte-
rior of the bell shall be carefully
wiped smooth and clean and
The annular space shall he free
from dirt or mortar mar
row gasket of packing shall be proper.
ly calked into each joint after which
Portland cement mortar, composed OF
one % part of cement and one GD
part Of clean sand. shall be introduce
therein, and such gasket shall be OF
one piece of sufficient length to reach
entirely around the pipe and of suff-
cent thickness to bring the bottoms
of the two pipes to the same level
No Joint shall be cemented until the
gaskets of the next two joints in al
vance are properly inserted. Special
care must be taken to fill with mortar
the annular space at the bottoms and
sides as well as at the tops of the
joints. After such space has been
filled, the cement having been com
pacted with a wooden or iron calking
tool, neat finish shall be given to tho
Joint by the further application Of
similar mortar to the face of the hubs,
so as to- form a continuous and even
beveled surface from the exterior OF |
the hub TO the exterior of the spigoi |
all around As soon as the cement of |
any joint has been compacted, tn |
bell hole under the hub must be care
fully and compactly filled with sand |
or fine earth so as 10 hold the exto
rior mortar finish of said Joints So |