For the first time in more than a half- century, crews on various projects are using a larger, stronger iteration of steel H-shaped piles recently approved by industry groups. The piles, typically used to construct deep foundations for buildings and bridges, also can save money on column applications, according to contractors and engineers. Photo: Frank Coluccio Construction New breed of H-pile braces excavation shaft on Hawaii sewer job. For years, H-pile cross sections have measured as large as 14 in. The new piles, designated HP16 and HP18, “go up to 18-inch cross sections, so now you’ve got bigger loads you
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.