Nicholson Construction was recently awarded a secant pile wall contract for the Maline Creek combined sewer overflow (CSO) project in St Louis, Missouri. Their scope of work will include 78 880-mm (~3-ft) piles to depths of 40 to 50 feet, 114 880-mm secant piles to approximately the same depth that will form a braced excavation. They will also install 4 seven foot diameter jet grout columns beneath an existing sewer to support it during excavation. [Source: More about the project at NicholsonConstruction.com. Image: Nicholson Construction]
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PITTSBURGH, PA – Nicholson Construction recently completed emergency repair work to an unstable pier supporting a bridge on INDOT’s Interstate 65. These repairs enabled a 37-mile section of the highway’s northbound lanes to be reopened after a four-week closure.
The highway was in the process of being rehabilitated and widened when the pier was damaged by steel piles driven into the water tight ground below it. The pier began to settle and eventually rotated ten inches.
Nicholson developed a design-build solution that used micropiles to transfer the loads to more stable soils and low-mobility grouting to fill voids and densify the upper subsurface layer.
[Editor] Read on to hear more about Nicholson’s fix of this unstable bridge pier. [/Editor]