The first Manitowoc Model 1015 foundation crane in South Korea has been assigned to excavate 50m (164ft) deep foundations for a high-rise construction project on land reclaimed from the sea.
Manitowoc claimed that the crane had adapted to this duty-cycle application thanks to having 30t (33 USt) of continuous line pull at all rope layers on the drum.
The company added: “A unique performance feature of the Model 1015 is that each winch has two hydraulic motors powering it, and the option to divert the pump flow to one winch at a time for faster line speeds. This design provides a more elastic winch power curve in the form of higher combinations of line pull and line speed. Winch performance is crucial in foundation and duty-cycle work, and the Model 1015 achieves higher production rates under demanding conditions.”
The machine was delivered in June 2005 to Busan-based foundation contractor, Daewang E&C Co Ltd. It is the first of two units purchased by the company, and was immediately put to work at the No 1 World Commercial & Residential Building construction project near the city of Incheon, on South Korea’s northwestern coast.
The crane is installing the foundations for a 64-storey apartment building, as part of the New Songdo City development. Foundation work began in July and will finish in October.
Daewang has been contracted to place 304 foundations on the project, averaging two to three per day. The piles need to be 3m (10ft) in diameter, so the Model 1015 was fitted with a locally supplied casing oscillator attached to the undercarriage.
Excavation within the casings is performed using a single rope hammer grab suspended from the boom. The total weight of the grab, when fully loaded, does not exceed 15t (16.5 USt). However, said Manitowoc, it had to be hoisted quickly from deep inside the shaft, “which is where the Model 1015’s extra winch power becomes a key differentiator”.
