Sandvik Introduces New Tunneling Jumbo

Sandvik Construction is introducing a completely new tunneling jumbo to its extensive offering: the DT922i tunneling jumbo. The DT922i is a fully-automated electro-hydraulic two-boom tunneling jumbo with a completely new articulated carrier. It offers intelligence, power and versatility to handle any tunneling job that comes along. Designed to improve the tunneling 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 tunneling 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.”

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.

Optimized performance with amplified drilling automation, corner stones for the design of the new tunneling 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.

Equipped with the powerful Sandvik RD525 rock drill, which provides 17% higher penetration rates, 40% longer tool life for the shank and 17% 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.

The DT922i’s brand new cabin comes with improved ergonomics and maximized safety. The new design delivers 25% greater visibility sector, reduced dust levels and provides more operator space. With noise levels under 69 dB at all times, it thus supplies a comfortable and safe working environment for the operator. Additionally the new state-of-the-art user interface, with touchscreen, is easy to work displaying comprehensive diagnostics with all drilling and carrier parameters split into logical subsystems and shown on one display.

Environmental, health and safety issues have not been forgotten in the design of the new DT922i. All lights of the new jumbo are based on LED-technology, which when compared to the more commonly used High Intensity Discharge (HID) lights, have  up to 500% increased lifetime,  and consume 50% less energy. In addition, the laser scanner access detection system optimizes personnel safety. 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. These being just examples of the new jumbo’s EHS-features, which enable the DT922i to be a trailblazer in modern underground drilling, not just from a productivity perspective but also an EHS one.

The new DT922i tunneling jumbo is being introduced at several local customer focused events around the world.

 

 

TECHNICAL SPECIFICATION IN BRIEF	SANDVIK DT922i
Hydraulic rock drill	Sandvik RD525
Drill feed	Sandvik TF5i (14’ to 20’)
Boom	Sandvik SB100i
Control system	Sandvik SICA
Automation levels	Gold (standard) / Platinum (optional) packages
Coverage area	14 800 x 9 000 mm (125m²)
Hole length	Up to 5 880 mm
Turning width (T-section)	5 300 mm
Transport / drilling width	2 500 mm* / 3 500 mm
Transport height	3 190 mm** / 3 590 mm
Transport length	14 990 mm
Total weight	30 000 kg (depending on options)