Placing concrete with concrete pump: Concrete shoots out end of elephant trunk in a stream of concrete directed by the worker at the left into wood forms, where it joins with the reinforcing steel to create horizontal foundation beams. To the right a second worker inserts and withdraws a flexible concrete vibrator that helps consolidate the concrete. Behind him a worker carries on his back the motor that drives the vibrator.
In background is temporary support wall, consisting of vertical steel soldier piles/beams that support wood breast boards that support the soil of the vertical soil embankment at the edge of the excavation. Soldier beams are supported at mid-height against lateral movement of soil by steel rod tiebacks, shown here with orange steel plates. Colorado Street, Denver, Colorado, December 4, 2006.

Placing concrete with concrete pump: Concrete shoots out end of elephant trunk in a stream of concrete directed by the worker at the left into wood forms, where it joins with the reinforcing steel to create horizontal foundation beams. To the right a second worker inserts and withdraws a flexible concrete vibrator that helps consolidate the concrete. Behind him a worker carries on his back the motor that drives the vibrator.
In background is temporary support wall, consisting of vertical steel soldier piles/beams that support wood breast boards that support the soil of the vertical soil embankment at the edge of the excavation. Soldier beams are supported at mid-height against lateral movement of soil by steel rod tiebacks, shown here with orange steel plates. Colorado Street, Denver, Colorado, December 4, 2006.