ISC 526 Mark Clark Expressway over US 17 & SC 7 Charleston Co, SC
Client Name / Address:
SCDOT,
PO Box 191,
Columbia, SC 29201
Project Description:
Triplett-King participated in the first ever SCDOT Value-Engineering/ Design-Build project in Charleston, with Banks Construction, United Contractors, and F&ME Consultants. Our team redesigned this entire interchange eliminating high earth embankments and roadway approach fills and costly retaining walls. The value-engineered design also provides considerable savings by eliminating 27-foot high roadway embankments for planned future phases.
Using the longest concrete beam spans ever designed or erected in South Carolina at a length of 153 feet, Triplett-King designed the 755 foot, horizontally curved, five span, two lane bridge with 74 inch, modified bulb tee prestressed concrete beams made continuous for live load. Upon Triplett-King’s evaluation of bridge types with regards to cost and constructability, preliminary and final plans were prepared on an accelerated schedule with close coordination with the contractor. The interior bent foundations consist of concrete columns on steel pile footings. The end bents are supported on Mechanically Stabilized Earth (MSE) walls. This bridge project was featured in ENR Magazine for reaching new lengths with prestressed concrete bulb tee beams. Triplett-King also designed an additional 132 foot, single span, single lane bridge (Line 6 Ramp) consisting of the same 74 inch bulb tee prestressed concrete beam over SC Route 7. End bents for this bridge are supported by Mechanically Stabilized Earth (MSE) walls.
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