Liebherr LR 1750/2
Yew Choon
The impressive Liebherr LR 1750/2 of Yew Choon from Singapore (SG) was deployed for an impressive job in Singapore (SG). The body was delivered to the construction site by a Scania R 620.
The body with a weight of approximately 108 tonnes can unload itself from the trailer using the cylinders on the undercarriage.
With the aid of a hydraulic cylinder mounted on the gantry, the crane can lift the crawlers from a trailer itself and mount them to the body.
The crawler of the Liebherr LR 1750/2 is 11.9 metres long, 2 metres wide and 2.13 metres high. The transport weight is 55 tonnes.
At the top the crawlers are hooked in and at the bottom secured to the body with a heavy pin. These large pins are hydraulically operated which shortens the assembly time.
Quickly continuing with the second crawler. Because Yew Choon uses the crane itself to install the heavy crawlers, no large assist crane is required.
Within an hour both crawler tracks are mounted to the body and the base crane moves to another position. The booms and ballast will be installed using the Tadano ATF 180G-5.
A few days later the crane is assembled and ready for impressive lifting operations.
The undercarriage is 12.3 metres long and 10.8 metres wide. A total of 95 tonnes of central ballast is mounted on the undercarriage.
A total of 220 tonnes of ballast is mounted on the upper structure. This consists of two trays of 10 tonnes with a total of sixteen blocks of 12.5 tonnes each.
Yew Choon equipped the crawlers of the LR 1750/2 with double drives. The width of the crawlers is 2 metres.
A total of 250 tonnes of ballast is placed on the superlift tray.
The task of this day; a large tree had to be relocated.
At a large radius!
Here the crane was assembled in SXLD4B configuration. The superlift D4 is 42 metres long here, the main boom has a total length of 84 metres.
To lift the tree, two holes are drilled in the trunk into which thick pins are inserted. The rigging will later be attached to these pins. The root ball still had to be excavated.
Several hours later the root ball is excavated and wrapped so that it does not fall apart during lifting. The rigging has already been attached and is under tension.
A 200-tonne hook from the Demag CC 2800 was used here.
This tree was to be replanted elsewhere on the site. In total three trees had to be relocated; this tree was the only one lifted during daytime.
Slowly the crane begins to take the load under tension; the total weight is often difficult to determine beforehand, therefore sufficient superlift ballast was prepared. The crane can lift approximately 90 tonnes in this configuration.
The radius of the LR 1750/2 here is approximately 68 metres.
The counter radius of the tray is hydraulically adjustable between a distance of 15 and 21.8 metres. Here the ballast was positioned at the maximum counter radius.
The final weight of this tree was 37 tonnes.
After the radius was reduced the superlift ballast was removed. The placement would take place at night and I was not able to follow it further. Nevertheless, an impressive and unique deployment by Yew Choon!