Glossary

French: écran/diaphragme

German: Scheibe, Abschlußwand, flexible Dichtung

Spanish: diafragma, pantalla

Italian: diaframma

Portuguese: diafragma

Dutch: membraan (diepwand)

A watertight concrete cut-off wall or a combination concrete structural cut-off wall tremie poured in an excavated and fluid (bentonite slurry) filled trench. See also Slurry Structural Wall, and Cutoff Wall

French: rideau souterrain

A structure made of steel sheet piles with each of the inner and outer walls consisting of a series of arc segments, which are connected at their intersections with diaphragms that extend through the cofferdam to form a series of cells. The cells are fil

A pile hammer, which carries its own diesel fuel to generate power internally.

French: marteau diesel

A diesel pile hammer in which the upward flight of the ram is arrested by compressing air, above the ram to form an “air spring.” Also called Double Acting Diesel Hammer.

A diesel pile hammer in which the upward flight of the ram is arrested by gravity. Also called Single-Acting Diesel Hammer.

Undesirable precombustion of the fuel in a diesel pile hammer (usually due to overheating or improper fuel). Also called Prefiring, Preignition.

French: cognement comme un diesel

French: tassement différentiel

German: Setzungsdifferenz, ungleichmäßiges Setzen

Spanish: asiento diferencial

Italian: cedimento differenziale

Portuguese: assentamento diferencial

Dutch: verschilzetting

A fluid -powered hammer in which fluid lifts the ram on the up stroke and is exhausted into and combined with additional fluid entering over the piston to take advantage of differential piston areas to accelerate the ram and to act in concert with gravity

An impervious barrier to control movement of water.

French: digue/barrage