Contractors building two segments of a 13-mile-long sewage conveyance tunnel near Seattle have devised plans to fix in place two stalled tunnel-boring machines that had been working in poor soils and high groundwater pressure. The tunnel is a key portion of King County, Wash.’s $1.8-billion Brightwater wastewater treatment project. The rims of the cutter heads on the 17.5-ft-dia Herrenknecht slurry machines were damaged, allowing rock and boulders to get stuck, says Gunars Sreiders, King County project manager. The general contractor, the joint venture Vinci/Parsons RCI/Frontier-Kemper, first stopped tunneling in May and laid off about 160 employees. The second machine was
The growing need to collect, store and analyze the huge volumes of data collected from infrastructure project stakeholders is generating a new growth area for construction-sector firms, IT vendors and professionals.