H-piles Have been an outgrowth of I-beams driven to fulfill a major problem: scour undermining of bridge piers and abutments in compact sand and gravel. The theory is talked over later in this e-book; the subsequent is an overview of the development of this theory with application to piles. Pushed https://maps.app.goo.gl/31Ww58sUy2HnsAqy5