From the outset of the project, the Board had considered installing screw piles through the cast iron shells of the tunnels that would be secured to the solid bedrock underneath the silt ...

Helical piers (aka helical piles, screw piles and ground anchors ... helical piers work well in unstable soil conditions. They install quickly with minimal disturbance. However, Powell says ...

German inventor Klaus Krinner, who created a Christmas tree stand that bears his surname in 1987, was given the humble task ...