Project numberPA-2399LocationMount Nebo, west of BrisbaneDate2022-06-21
← Project registerConcrete placement to a ridge-top slab
Sixty-two skip cycles of concrete flown to a ridge-top slab a pump could not reach.
01
The constraint
The last 1.9 km of access was a single-lane track with switchbacks a truck-mounted pump could not negotiate.
The pour had to be continuous to avoid a cold joint in a structural slab.
Trucks could only reach a batching turnaround at the base of the ridge.
02
The lift
- Load weight
- 1,100 kg
- Aircraft
- Airbus H125
- Line length
- 30 m
- Crew
- 6
- Exclusion zone
- 45 m
- Lift cycles
- 62
01A dedicated skip station was set at the turnaround with two agitators rotating.
02Skips were flown on a 30 m line on a fixed 4 minute cycle to hold the pour rate.
03Placement crews worked the slab continuously; the pour closed without a joint.
03
The numbers
- Time on site
- 4.4 hrs
- Flight time
- 3.2 hrs
- Crane alternative
- Pump not achievable · road upgrade $240,000
- Road closures
- 0
04
On site
05
Client record
“Continuous pour on a ridge with no pump access. On paper it should not have happened.”