FALL 2017

ASPIRE is a quarterly magazine published by PCI in cooperation with the associations of the National Concrete Bridge Council. The editorial content focuses on the latest technology and key issues in the Concrete Bridge Industry.

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and a rise of 12 ft, that sits on cast-inplace concrete walls. The tunnel length was set to accommodate headwalls located just outside the concrete barrier along ramp M, resulting in a total length of 268 ft. To provide sufficient clearance (16.5 ft minimum vertical) for traffic through the structure, the three-sided precast concrete structure sits on top of castin- place concrete walls that are approximately 19 ft high. A 3-in.-deep groove is formed into the top of the cast-in-place concrete walls, about 6 in. wider than the leg of the three-sided unit. The precast concrete section is set in the groove and grouted in place. There are no anchors or reinforcement attaching the precast concrete unit to the cast-in-place concrete walls, so it is a hinged connection. The walls are 3 ft thick to accommodate the base of the precast concrete section. The structure is supported on spread footings founded on bedrock. Approximately half the length of the structure is on a 5-degree 45-minute curved alignment to match the roadway passing through the structure; the remainder is on a tangent alignment. The roadway through the structure consists of two 12-ft lanes with 10- and 4-ft shoulders. The tunnel was constructed by the open-excavation method. The sides of the excavation were laid back where possible, with only a short length of temporary sheet piles used where necessary to protect an adjacent parking lot. The end sections were supported temporarily during construction due to the weight of the headwalls along the outside edge of the section. The headwalls were detailed in the plans as cast-in-place concrete; however, the contractor elected to use precast concrete headwalls. The two headwalls varied greatly in height due to the extreme skew, ranging from 13 ft 3 in. to 1 ft 0 in. This made design and fabrication of the precast concrete headwalls more challenging. Three of the wingwalls for the tunnel were designed using mechanically stabilized earth walls because a new embankment was being placed behind these walls. The walls varied in height from 3 ft to 33 ft. The fourth wingwall, which varied in height from 8 ft to over 20 ft, was designed using a soldierpile wall with hardwood lagging to support an existing parking lot drive and building. To enhance the aesthetics of the structure, a concrete facade was added to the soldier piles when the excavation was completed. OHIO DEPARTMENT OF TRANSPORTATION, OWNER BRIDGE DESCRIPTION: A 268-ft-long precast concrete three-sided arch culvert sections with 48-ft-long clear span and 12-ft-high rise on cast-in-place concrete walls STRUCTURAL COMPONENTS: 69 precast concrete arch sections, 708 yd3 of concrete in walls, 948 yd3 of concrete in wall footings BRIDGE CONSTRUCTION COST: $2.5 million on a 28-month construction schedule, which was completed in September 2015

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