Haslach Installs Giant 98t Prestressed Concrete Trusses with Tandem Lifts

After a lot of planning Kranverleih Haslach achieved successful deployment several prestressed concrete trusses weighing 98t were installed in the Austrian town of Bludenz for the construction of a new hall at the Getzner textile factory. The hall floor with full cellar running underneath and the limited footprint made the deployment a considerable challenge.

Well supported: the hall floor had cellar running all the way underneath it and was stabilised with ceiling supports after thorough testing and many calculations.

Getzner’s deliveries also had to continue uninterrupted. Tobias Haslach, owner of Kranverleih Haslach GmbH, recalls: “After extensive planning and many detailed calculations, we were able to come up with a solution for the installation work in conjunction with the other companies involved. We stabilised the cellar ceiling from underneath with ceiling supports in order to achieve the support strength required to allow our LTM 1300-6.3 to work on this cellar ceiling.” Alongside the 6-axle mobile crane, the special transport also drove onto the cellar ceiling to unload the 98t concrete truss.

Two Liebherr mobile cranes from Kranverleih Haslach erected a total of ten prestressed concrete trusses for the construction of a new hall in Bludenz. The hall floor with cellar made the job a challenge.

Haslach used an LTM 1230-5.1 as the second crane for the tandem hoist. Tobias Haslach recounts the challenges: “We set up the 5-axle vehicle on a specially filled embankment outside the hall. Due to the positioning behind a concrete wall, we were only able to coordinate with the work team via radiotelephony. The truss also had to be guided around the LTM 1300-6.3.

” When lifting the truss from the truck, both mobile cranes were working at maximum capacity with a load of 51t each and a radius of 13m and 15m respectively. Two reinforced concrete trusses were installed in one day. With a length of 47.3m and a total weight of 148t, the transport required a special permit and was only allowed to travel at night. After each installation, both mobile cranes were moved with all their equipment including ballast and positioned for the lifting of the subsequent reinforced concrete trusses.

Poor visibility: the LTM 1230-5.1 had to be positioned behind a wall. The coordination via radio worked smoothly.

“The cooperation on the construction site was excellent. Operations at the Getzner textile factory continued virtually undisturbed. Our two crane operators were also delighted with the collaboration of everyone involved on site,” says Tobias Haslach. The family-run company Kranverleih Haslach is based in Wertach in southern Germany and relies entirely on Liebherr for its nine mobile cranes.

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