Sandvik jumbo for Helsinki cavern excavation 05 Aug 2016

A Sandvik tunnelling jumbo is meeting the underground challenges associated with excavation of a car park cavern for one of the largest current commercial developments in Helsinki, Finland.

Underground handover of the Sandvik DT1131i jumbo

Contractor SRV Infra ordered a Sandvik computer-controlled three-boom electo-hydraulic DT1131i for the underground works on the REDI project, which includes construction of a shopping centre and eight high-rise towers as part of a wider redevelopment of the entire Kalasatama district of Helsinki.

When it opens in 2018, REDI will be Helsinki’s largest downtown shopping centre with an estimated 12 million visitors expected in its first year. A critical part of the development is the construction of extensive underground car parking facilities for 1,100 cars.

SRV maintains a fleet of Sandvik tunneling vehicles, with the new DT1131i recently delivered to site to assist in completion of ongoing cavern excavation work. The computer-controlled three-boom electro-hydraulic drilling jumbo is designed for tunnelling and cavern excavations with cross sections of 20–183m². This includes face drilling, bolt hole drilling, and mechanized long-hole drilling.

Three-boom Sandvik jumbo has a reach of 183m²

Sandvik’s DTi jumbos are equipped with the iSURE tunnel management program, intelligent iDATA control system, high frequency RD525 drills, robust booms and advanced drill string guides. A Sandvik maintenance technician is based on-site to train SRV operators, and to support the jumbo’s operation to ensure peak performance at all times.

Sami Korhonen, for SRV, said: “The new jumbo will supplement our existing fleet and help maintain our competitiveness in the market place.”