The evening telegraph. [volume] (Philadelphia [Pa.]) 1864-1918, 1870-03-02

SOUTH STREET BRIDGE.
lescrivtIsn q the Proposed Structure.


Mr. John W. Murphy, TO whom the contratt
toT the construction Of bridge over the Schuyl-
Kill river at South street has been awarded,
will, as soon as his securities are approved pro-
eeed to the erection of the proposed structure,
which Is TO extend from the intersection of
Chippewa street with South street upon the
eastern side, to the high ground of the Aims
house property beyond the junction and West
Chester Railroads on the west side of the river.
IL will be composed of seven hundred feet rough
rubble retaining walls; two hundred and fifteen
feet of irregular range retaining walls; six hum
dred and eighty-fve feet of brick arches with
stone rings; one hundred and sixty-nine feet
of iron girder bridge over railroads. seventy
four feet of main abutments standing five hum
dred and seventy-six feet apart; with five hun
ared and eighty-four feet superstructure, con-
sisting of two permanent spans of one hundred
and eighty-five feet each, and pivot draw, with
two openings of seventy-seven feet each, sup
ported upon cast-iron PIERS From Chippewa
street, for distance of four hundred and
seventy-three feet, the roadway will be sup
ported by retaining walls, connected at their
western end by an abutment for four prick seq
mental fue arches, with stone rings, backing,
spandrils, and coping, to be erected between
the retaining walls and the eastern main abut-
ment upon a curve of two hundred and twenty
seven feet radius, the spans TO be thlrty-tour
feet on the north and forty feet on the south
side, with versed sines relatively of nine, eleven,
thirteen, and fifteen feet The piers to be five
and one-half feet thick; located with their centre
lines upon lines ST radii to the curve, tangential
to the line of South street at face of abutment
connecting retaining walls, and to the diverted
line of bridge crossing the river, at the back
of the main eastern abutment. The width of the
approach will be fiftyfve feet from face to face,
with carriage way thirty-fve feet, and ten feet
wide foOtway upon each side. The main abut-
ment will be thirty-seven feet from back to face,
with width of sixty feet The western abut-
ment of main bridge will correspond in size and
architecture with the eastern, and between its
western face and the Junction Railroad a dis
tance of five hundred and fourteen feet, there
will be ten arches, built of brick, having spans
of forty-ive and eight-tenths feet each, and
twelve feet versed sine; with piers five and one
half feet thick, and an abutment at the junction
Railroad eleven feet thick. At the crossing of
the railroads there will be three spans of
wrought-iron girders, fifty-six and four-tenths
feet long, giving clear headway of sixteen feet,
supported by two lines of wrought-iron columns
placed between the tracks of the railroad. From
the abutment upon the western side of the rail-
roads, the approach will be supported by retain
ing walls. The width from face to face of
retaining walls, and of approach arch ways, will
be the same as on eastern side of the river.
All the masonry of the bridge below high
water is to be laid In hydraulic cement, and
above that level in mortar composed of wood
lime and sand Cor screened graveD, in such pro-
portions as the engineer may specify. The piers
In the river to sustain the main bridge super
structure will consist of cast-iron columns
Those for the permanent spans Zone on each
side of draw will be of two columns, eight feet
exterior diameter, with ice-breakers at each
end composed of a column four feet diameter
with top at datum line. The pivot pier, to sus-
cast-iron columns, the centre column to be six
feet diameter, and the outside line four feet
diameter, placed at distances of twelve and five
tenths feet from centre to centre, so that they
shall form circle with diameter to their out
side of thirty-siX feet. The columns, for per-
manent spans, will be sunk at the distance of
thirty-six feet from centre to centre. The two
permanent spans will be each one hundred and
ntratx faaf and
iron, excepting the Jost and panking
of roadway and footway. There will
be two trusses for each span twenty-five feet in
height and thirty-six feet from centre to centre
outside of which will be footways six feet wide
in the clear The draw is to be twenty-three
feet in width from centre to centre OF truss, with
outside footways six feet in the clear. The
turning of the draw shall be effected by means
of rack, secured to and around the entire
circle of the twelve inch beams forming the
lower tread of travelling-wheels, into which
shall work ten inch pinion, having such addi-
tional gearing as may, in the Judgment of the
engineer, be requisite to enable two men, with
out undue exertion, to swing the draw. The
gearing to have an upright shaft extending to
within six inches OF the top hoor OF draw, upon
which lever with socket head can readily be
placed, and to which the necessary power for
turning can be applied.
All materials provided shall be of the best
description subject to the approval of the Chief
Engineer and Surveyor, or, in his absence, by
the engineer in charge. And If any materials
which the engineer may deem of inferior quality
or untitled to be used are brought to the work,
the same shall be forthwith removed and If the
directions of the engineer are not complied with
within twentY-four hours after written notice,
he shall be at liberty to remove the same at the
expense of the contractor.
The time fixed for the completion of this work
is thirty months from the date of the Chief
Engineer and Surveyors order to commence
And the contractor shall pay as liquidated
damages 5000 for every day that any part of the
said work, by his default shall remain unfn-
ished after that time.
AS stated in yesterdays TELEGRAPH, Mr.. Muir
ply contracts to build the bridge above described
for the sum of $770000.