The leader., 1898-11-16
NEW STEEL BRIDGE.

Plans and Specifications Adopted by the
Board of Supervisors for the Proposed
steel Bridge Across Homochitto River
on the Brookhaven and Union Church
Road.
At their meeting last Thursday the
Board of Supervisors adopted the
plans and specifications drawn by f.
P. Alsbury & Son, agents of the New
Jersey Steel and Iron Co, Houston,
Tex, for new steel bridge over the
Homochitto river on the Brookhaven
and Union Church road. 1t is propos-
ed to let the contract on the first Tues
day in January, the Board reserving
the right to reject any and all bids.
PLANS AND SPECIFICATIONS.
The proposed structure will consist
of one fixed steel high truss span of
225 feet between centers of end pins,
and one 30 foot steel span, and one 10
foot wood apron approach at each end.
The width of roadway shall be 16 feet
in the clear from end to end of bridge.
The capacity of the spans and the sec
tions required in their construction,
etc, are shown on plans which said
plans are hereby made part of these
specifications. The floor joists and
hand shall be of long leaf heart
pine lumber of sizes and dimensions
as given on plans.
The sub structure shall consist of
steel cylinder piers under main span,
and the pier at end of 30 foot span
shall be a steel column pier. The
steel cylinder piers shall consist of
two steel tubes to each pier, 80 feet
long, tubes to be feet in diameter
throughout and of a inch plate steel
tubes to be made up in sections firmly
riveted together with % inch rivets
spaced four inches apart, centers on
both vertical and horizontal joints.
Tops of tubes will be covered with
steel plate caps IS inch thick, and 4.6
in diameter, caps to be firmly con-
nected to tubes with 215 X 3 angle riv-
eted to caps and tubes. Top strut will
be one y | beam steel at 81 pounds
per foot Bottom strut between cyl
inders shall be composed of two 7 inch
channels latticed together with Ok Il
bars, single laced at 60 degrees with
the axis of the member; struts to be
firmly connected to the tubes by suit
able lugs Wherever the struts are
connected to tubes an extra reinforc-
ing plate 3-16 in thickness shall be riv-
eted to inside of tubes and such plate
will cover the entire connection
Diagonal sway rods will consist of
bars II square with upset screw ends
and standard sleeve nut adjustment.
The piers shall be sunk to a depth
floor to top of bluff bank on east side
will have to piling driven inside
each tube to firm and solid founda-
ton. Said piles shall project up into
the tubes not more than Il to IA feet.
All tubes will be solidly filled with
concrete composed of one part of
Louisville cement or its equal, three
parts of clean sharp sand, and five
parts of broken stone or gravel.
The cement, sand and gravel will be
thoroughly mixed dry on boards or in
box and wet with sufficient water to
form a stiff paste. The concrete shall
be we'll rammed as the tubes are being
filled.
The whole operation of mixing and
laying the concrete must be perform
ed as quickly as possible and no por-
ton of it will be allowed to be used
after it has begun to set.
All metal shall receive one coat of
good metallic paint at shops and one
after erection, and all surfaces that
are inaccessible after erection shall be
thoroughly covered before being erect
ed No painting will be allowed in
rainy weather The contractor will
furnish all materials and complete the
entire structure ready for travel.
The main span shall have neat de-
sign of ornamental cresting over the
portals at each end of span, and a
large cast iron name plate shall be
placed in the centre of each portal
with the names of the supervisors, the
clerk and sheriff cast in large raised
letters.
The finished structure must have a
neat and attractive appearance and
the line of trusses must be adjusted
to perfectly perpendicular position.
The steel column pier under end of
small span will be composed of steel
channel legs eight feet long, 2-6 at 8
fbs, channels latticed together with
11sx1 bars. The to strut of beam
shall be one 10 inch at 25ib | beam.
This pier will rest on concrete pedes-
tails and be secured thereto by means
of anchor bolts and plates.
Each bid must be accompanied by
certified check in the sum of $4,000
to secure the execution of the con-
tract.