Lifting of beams by Bok Seng
Bok Seng from Singapore (SG) deployed two large cranes for the installation of heavy concrete bridge beams. These are the Kobelco SL6000 and the Liebherr LTM 1750-9.1.
Each beam is approximately 39 meters long and weighs 122.3 tonnes. The beams are used for a bridge over a canal and two lower pedestrian walkways.
The transport of the beams was also carried out by Bok Seng. For this purpose, among other equipment, a MAN TGS 40.540 with two six-axle Scheuerle K25 modules with turntables was deployed.
The LTM 1750-9.1 has extended its main boom here to a length of 43.7 meters, the SL6000 is operating with a 66-meter main boom.
The second beam was also picked up relatively quickly and positioned above the bearings.
The transport of the beams can only take place at night; the following day the lifting operations and installation of the beams continue.
Because the beams can only be delivered alongside the LTM 1750-9.1, it is necessary for the SL6000 to pick up the beam at a large radius. The SL6000 is lifting a total of 66.16 tonnes here at a radius of 56.5 meters. The LTM 1750-9.1 is also lifting 66.16 tonnes, but at a maximum radius of 24 meters.
The use of 250 tonnes of superlift counterweight at a 16-meter radius was necessary to pick up the beams at a large radius.
The SL6000 then luffs to a radius between 13 and 21.4 meters. The superlift counterweight is first disconnected so that the crane can slew.
The LTM 1750-9.1 places the beams at a radius between 17.1 and 24 meters.
Relatively quickly, the fourth beam is already hanging above the bearings. Bok Seng is highly experienced in such operations.
Beam number five is installed here.
At the time, this was the most powerful crawler crane in the Bok Seng fleet; today that is a Liebherr LR 1750/2.
The LTM 1750-9.1 is still the most powerful mobile crane at Bok Seng.
The superlift counterweight is only used for picking up the beam at a large radius. The heavy stack remains in the same position during the operation.
The sixth beam was also installed relatively quickly.
The next beam is already positioned next to the LTM 1750-9.1.
An impressive and robust operation carried out by the specialists of Bok Seng.