Apartment built using tilt-up technique
By Christian Shelton18 September 2019
Canadian construction company Tilt Wall Ontario, which specialises in the tilt-up construction technique, has built a new apartment block using the technique at the luxury Muskoka Bay Resort in Ontario, Canada.
The tilt-up construction technique is where concrete panels are cast either on or off-site and then hoisted up and tilted into position. These panels then become the building’s load-bearing structural components, eliminating the need for perimeter columns.
The Muskoka Bay Resort apartment building was constructed using 381 precast tilt-up concrete panels. The panels’ width ranged from 1.5m (5ft) to over 18m (60ft) with weights between one tonne (3,000lb) to 58 tonnes (128,000lb). These formed a five storey multi-unit residential apartment with a sixth storey on three stair towers.
To lift the precast panels into position Canadian construction specialist Surespan provided crane services. Surespan utilised its 750 tonne capacity Liebherr LG 1750 lattice boom mobile crane, with a 350 tonne capacity mobile crane as an assist crane.
Tilt Wall Ontario also sourced the spreader beams to facilitate the lifting of the panels. For this it turned to Canadian equipment sales and rental company Equipment Corps which supplied two modular spreader beams from UK-headquartered spreader and lifting beam manufacturer Modulift: the MOD 50 and MOD 110. They were used to even the load distribution and to facilitate proper angles on the lifting slings and hardware.
Tilt Wall Ontario project manager Ken VanCasteren elaborated, “We utilised two different sized beams and, between the two, they were used for about 80 to 85 per cent of the picks. We did not adjust the lengths of the beams during the lifting process but instead used the two different beam sizes to allow for quicker rigging changes. For the MOD 110 we used an eight-point pick for load distribution and on the MOD 50 we used a four-point lifting setup.”
The LG 1750 lifted the panels horizontally to the required height and then tilted them upright into place by sliding the wire rope links through the snatch blocks attached to the spreader beam. According to Modulift, the spreader beams are designed to be particularly stable and trusted for this type of manoeuvre and are compatible with snatch blocks. The Tilt Wall Ontario team then braced the panels until the permanent structural connections were completed.
Ken VanCasteren added, “It was a pleasure to work with Equipment Corps on this project. When issues or concerns came up regarding the loading and safe working loads of the rigging on some of the heavier lifts, Equipment Corps was quick to respond and review all of the loading calculations to ensure everything was rated properly. The Modulift beams were versatile and easy to get the required spreads needed. The beams assembled easily and were user friendly throughout the project duration.”