Sandvik Construction is introducing a completely new tunnelling jumbo to its extensive offering: the new, fully automated, DT922i tunnelling jumbo. This will bring to customers true tunnelling quality, reliability and exceptional versatility. With a new articulated carrier, it features a next generation cabin supplying 25 percent increased visibility, and noise level of less than 69 dB at all times. Intelligent, state-of-the-art control system, and Sandvik’s iSURE excavation management tool, create a combination which, according to the company, will change the future of tunnelling.
The DT922i is a fully-automated electro-hydraulic two-boom tunnelling jumbo with a completely new articulated carrier. It offers unique intelligence, true power and ultimate versatility to handle any tunnelling job that comes along. Designed to improve the tunnelling quality through its novel automation and planning function, the DT922i has been developed for excavating cross sections up to 125m², including face drilling, bolt hole drilling, and long-hole drilling.
“If you want a jumbo that will be able to perform all different tunnelling excavation, this is the one for you,” says Tommi Salo, Product Line Manager, Tunneling, Sandvik Construction, who adds: “Our aim was to create an all-round jumbo that is high in performance, reliable in use and possesses the same intelligence like our other i-series jumbos, but at the same time is able to offer the customer the flexibility they were after in terms of new carrier and improved automation. Looking at the end result, I think we have succeeded very well.”
Maximized versatility
The DT922i comes with many new features that increase productivity simply through the machine’s genuine adaptability to different working sites. The new articulated carrier enables the jumbo to operate in tight tunnels with narrow corners. Moreover, the new optional cabin lifting system gives improved visibility, but at the same time allows to tram in low tunnels. The hydrostatic transmission system and joystick control enables very precise dynamic control of tramming speed and steering. The practical multi-voltage concept for different electric voltages allows easy and fast shift to different working sites. Combined with the efficient RD525 rock drill, intelligent drilling and boom control systems, as well as the iSURE tunnel management system, the DT922i offers an unbeatable combination for any tunnel excavation.
Advanced drilling and boom control systems
Optimized performance with amplified drilling automation, corner stones for the design of the new tunnelling jumbo, has resulted from the use of Sandvik Intelligent Control System Architecture (SICA). This is a well-proven and intelligent drilling control system with nine different hole type settings, and three alternative control methods: manual drilling control, feed percussion follow-up, and intelligent torque control. The DT922i also possesses a new easy-to-use boom control system with three different modes for manual boom control. With this new technology the accuracy of drilling is brought to a completely new level which facilitates enhanced and maximized performance.
Efficient drilling
Equipped with the powerful Sandvik RD525 rock drill which provides 17 percent higher penetration rates, 40 percent longer tool life for the shank, as well as 17 percent for the bits (when compared to its predecessors), the DT922i delivers superb performance in any conditions. Its two accurate SB100i booms are equipped with stiff square shape profile giving maximized support to the rock drills and further add to the precision in drilling.
Engine
The DT922i is available with the fuel efficient and emissions-friendly Tier 3 diesel engine (119 kW) as standard, or the optional Tier 4 Final (122 kW), which provides even greater levels of reduced emissions, with the powerpack consisting of two 75kW IE3-compliant electric motors.
Automated drill planning
Two automation levels are also offered: gold and platinum. The standard gold package facilitates drilling according to predefined drill plans. This automation level includes features such as drilling to predefined depth, drill plan visualization, rig navigation and an option for automatic long hole drilling. It also integrates the iSURE tunnel management tool for creating accurate plans for drilling, charging and blasting, as well as data collection and analysis tool for improving work cycle and process. The enhanced platinum package includes all features from the gold package, but enables full automatic face drilling with “iDATA”.
