| SR-519 Project, Seattle, WA
The State Route 519 is a crucial connection from I-5
and I-90 to the waterfront for cars and freight. The
project will rechannel, widen and improve the First
Avenue and South Atlantic Street intersection in Seattle.
An elevated ramp will be constructed that connects westbound
I-90 to the South Atlantic Street overpass and rechannel
South Royal Brougham Way Railroad Overpass between Fourth
Avenue South and First Avenue South. In addition, they
will close the at-grade Burlington Northern Santa Fe
(BNSF) railroad crossing on South Royal Brougham Way
and construct a grade separating structure that will
cross over the BNSF railroad tracks and connect Third
Avenue South to South Royal Brougham Way Railroad Overpass.
For this project Malcolm constructed 26 total large
diameter oscillator fully cased drilled shafts along
Royal Brougham and Atlantic Street in Seattle. Along
Royal Brougham 10 total 2.8 meter shafts were installed
to depths in upwards of 100 feet deep. 5 total 4 foot
OD shafts by 70 feet long were also installed along
Royal Brougham for their parking and stairway structures.
Along Atlantic Street 11 total 3 meter shafts were installed
in upwards of 100 feet deep. Permanent slip in casing
shoring ranging from 20 feet to 38 feet long was also
installed in all shafts along Royal Brougham and Atlantic
Street to facilitate the General Contractors column
transition pours.
5 drilled shafts along Royal Brougham were installed
directly in between (within inches) of a live 72 in
water main and a live 96 in sewer main. The utilities
were between 4 feet and 7 feet below ground. These utilities
were still in use so it was crucial that no damage was
done while we were constructing the drilled shafts at
these locations. The 3 meter oscillator is capable of
producing a maximum of 1.8 million foot pounds when
extracting the temp casing, so to ensure we did not
crush or damage the two utilities while installing the
shafts we installed 4 micro piles at each location,
each being 8 in OD by 90 feet in length. After the micro
pile installation was complete we set a steel reaction
frame on the micro piles. Our oscillator was then set
on top of the reaction frame. By doing this we able
to displace the weight of the equipment and the reaction
force of the oscillator below the utilities thus ensuring
that no damage was done.
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