Harrisburg telegraph. [volume] (Harrisburg, Pa.) 1879-1948, 1916-09-28
BUILDING OF c. v.
BRIDGE GREAT FEAT
(Continued From First Page1

on Island Park. The greater part of
the two-track arch structure Is being
built under traffic movement, with the
aid of two cranes. three dinkeys. the
concrete plant, eleven half-arch forms
and one-third mile of trestle. The
ficient height with turnouts, beneath
feet in length and contain $4,000 cubic
yards of concrete above water.
Concrete Arches Replace Steel
Two concrete arches replace each of
the old steel spans, which were first
moved eight and one-half feet up
stream on the old double track piers
and kept in service while the south
half of the new bridge was built. Traf-
flc was then transferred to the new
structure and the old steel bridge re-
moved. With the exception of the
two spans on the west shore and bank
all the concrete is placed by the pneu-
matte method from a plant located on
the lower end of Island Park.
The main concrete plant on the Is
land is supplied with material by rail.
The level of the old bridge enabled
the construction of a trestle of suf-
ficient height with turouts, beneath
which are the stone and sand bins
with a capacity of $50 tons; and
cement shed holding about 200 bar
! rels. Sand and stone are delivered in
hopper bottom cars. and cement is
dropped down a wooden chute to the
level of the charging platform.
Use Small Mixer
Under the platform are located the
sand and stone bins, and three meas
| uring hoppers emptying into chutes
| which feed the one-half yard Haines
mixer suspended over the track for
the concrete cars. Two of the hop
| pers are for measuring stone. one be-
! ing filled as the other is emptied, and
| the third is for sand. The concrete
is turned out at the rate OF 30 yards
per hour. 1t is dumped into two
| large buckets on q platform car and
hauled over the narrow gauge tracks
on the low trestle work. to the point
where 1t Is placed in the moulds for
the arches and piers.
The work on the lower half of the
bridge was completed late last No
vember, two weeks ahead of time.
| This year the contractors were held
up by high water and floods which
washed away a large portion of the
| trestle work. This nccessitated doing
| over again much of the important
work, but to-day the upper half of
the bridge between the Harrisburg
shores and Island Park is about COM
| pleted; and work is we'll underway
on the west side of the Island.
Ready on Schedule Time
In spite of the six weeks delay
caused by the foods, and barring ac-
cidents or further trouble from high
water the big bridge will be completed
on schedule time. Arch forms are
usually concreted in eight hours Re-
, Gently one arch, containing 275 cubic
yards, and located 1000 feet from the
mixing plant, was completed in seven
and one-half hours. The contractors
have forces of men working night and
day, and in good and bad weather.
There is always something that can
be done and some time saved. There
remain 2S arches to be completed.
The bridge is being built by the
Robert Grace Contracting Company
for the Cumberland Valley Railroad
Company, of which T. b. Kennedy is
chief engineer. Crosby Tappan, of
Chambersburg. is engineer in charge
of construction. A. f. Byers is chief
inspector and S. +. Bloyer, resident
engineer for the railroad. Superin-
tendent F. P. Kemen is in charge for
the contractors.