| Concrete grade beams spanning between the caissons were used to accommodate external envelope conditions and elevator pits. |
| The buttresses rise from caisson caps, each covering six concrete caissons. |
| The caissons, with concrete compressive strengths of 5000 to 6000 psi, were in good condition and are being reused. |
| The caissons were huge hollow reinforced concrete blocks that were floated across the channel and then sunk when in position. |
| Our company did the white, ivory and mignonette green paintwork on the staff caissons in the rotunda and the south-east gallery. |
| In 1996 the log shafts had been replaced by concrete caissons, but the mine was essentially dormant. |
