Sandvik Mining and Rock Technology has launched its latest development for tunneling excavation, the DT1132i jumbo. The new Sandvik DT1132i tunneling jumbo itself is a three-boom, electro-hydraulic jumbo that has been purpose-designed for fast and accurate drilling in tunneling and cavern excavation. The computer-controlled rig possesses both operator-controlled boom positioning and full-face automatic drilling functions. As well as incorporating some of Sandvik’s latest developments in digital solutions, the new rig uses Sandvik’s new high frequency RD535 rock drill, robust booms and advanced drill string guides.
New Rig, New Features
The RD535 rock drill, automated drilling features and new rock tools mean that that the DT1132i delivers the results required, but with 40 % less exhaust particles, up to 20 % higher penetration rate and with 25 % more side coverage.
The essential premise behind the development of the new DT1132i is to provide users with increased drilling performance and accuracy, thanks to its fast and adaptive drilling control capabilities, able to account for changing rock conditions. The rig design also maximizing operator safety and ergonomics, with improved fleet standardization (high parts commonality) enabling extended rig usage across different work sites.
Amongst the new features on the new rig is a 3 m telescopic TB160i boom, optimized with a front wrist structure that provides 1 m additional side coverage as standard, and 4 m side coverage with telescopic adjustment. The new boom also uses a new fully proportional boom control for accurate and fast manual boom handling (automated boom controls come with the optional Platinum package), with intelligent compensation models to give accuracy in all operating conditions.
New Cabin for Safety and Comfort
An ergonomic vibration-dampened cabin has been designed for the new rig. This provides the operator with excellent all-round visibility, low noise level inside the cab thanks to its acoustic windows, a filtration system to minimize dust inside the cab (according to standard EU6/7) and an open and spacious operator environment. Doorways have been located in the rear of the cab to minimize any disturbance for the operator, whilst safety has been maximized with a FOPS-compliant cabin.
Comprehensive diagnostics information is integrated into one display. These include drilling diagnostics for boom instrumentation, drilling control system and shank lubrication, together with carrier diagnostics for electric motors, pumps (hydraulics and water), transmission system, diesel engines, brake system, jacks and cable reels.
Power and Efficiency
The new RD535 is a high frequency rock drill wih maximized power transfer capabilities, leading to a high drilling speed without compromising hole quality. It has a powerful patented percussion mechanism, as well as a tool-saving, efficient and patented stabilizer structure for increased reliability. These features, together with improved flushing and efficient cooling, provide uninterrupted high-speed drilling.
The DT1132i possesses a highly powerful transmission system with a Cummins B6.7, 168 kW diesel engine (stage 5)
which can be operated up to 5000 m above sea level without any modifications. The new engine provides up to a 90% reduction in NOx emissions (when compared to stage 3 engines), with more than 90% mass reduction for DPM. The rig utilizes a new carrier which uses more efficient hydraulic and water systems. These include separate circuits for both drilling and tramming hydraulics, proportional flushing valves to adjust the flushing flow and inlet/outlet pressure monitoring.
The rig steers by hydraulic rear wheel steering and its electric current reducer unit provides electric reactive power element (kVar) from an onboard capacitor, reducing electric current draw by up to 20%. The 3 x 90 kW IE3 electric motors require 2.5 % less energy, with all working lights based on LED technology, automatically controlled based on tramming direction and with directional lights available where needed.
A new feed – TF535i – also provides increased feed force for high power drilling, whilst a saving hose reel structure gives longer service life for the hoses which are of an increased size. A hose support structure enables the independent tightening of every single hose, thereby reducing any pressure drop. An integrated accurate linear sensor ensures accurate rock drill positioning and a new slide piece design enables 50% less wear and friction.
The DT1132i is available with some of the latest developments in automation, including a SICA control system for intelligent torque control/feed percussion, with monitoring and fleet management for My Sandvik. To further improve the excavation process, remote access via WLAN can be chosen which allows web-based data transfer as well as online MWD.
As ‘Gold’ standard, the DT1132i comes with torque based semi-automated drilling, manual boom control and rod handling, all enabling drilling to a predefined depth with feed angle measurement and drill bit location measurement. Drill plan visualization and rig navigation are also included. In addition to these standard features, the rig is also available as part of the ‘Platinum’ package with automatic long hole drilling and fully automatic face drilling.
New Drilling Tools
An underground drill rig is only as effective as the rock tools, rock drills and bits it uses. For face drilling, the DT1132i comes with the new Sandvik Alpha 360 drilling system for the RD535 rock drill. This delivers features such as an optimized rod diameter with increased flushing hole size, increased flushing and higher penetration rates, as well as a new Sandvik Alpha 360 connection. The latter possesses a new larger bit thread for increased drilling power and straighter holes which gives higher advance rate per blast. For grouting, the GT38 system provides 50 % less deviation and increased service life.