Sandvik launches DT1132i tunnelling jumbo

Sandvik Mining and Rock Technology has introduced its latest development for tunnelling excavation, the DT1132i jumbo. The machine is equipped with the company’s new high frequency RD535 rock drill, robust booms and advanced drill string guides, making it a complete high-speed drilling solution.

The DT1132i three-boom, electro-hydraulic jumbo has been designed for fast and accurate drilling in tunnelling and cavern excavation. This computer-controlled underground rig possesses both operator-controlled boom positioning and full-face automatic drilling functions.

All Sandvik DTi tunnelling jumbos feature a special modular design for high flexibility and versatility. They use advanced automated drilling solutions, such as iSURE tunnel management software and SICA intelligent control system.

With the RD535 rock drill automated drilling features and new rock tools, Sandvik said the DT1132i can deliver the results required but with 40% less exhaust particles, up to 20% higher penetration rate and with 25% more side coverage (3 x SB160i 190 sq m - 19,400 m x 12,200 m).

The rig design is also intended to maximise operator safety and ergonomics, with improved fleet standardisation (high parts commonality) enabling extended rig usage across different jobsites.

The new 3-m TB160i telescopic boom is optimised with a front wrist structure that provides 1 m additional side coverage as standard, and 4-m side coverage with telescopic adjustment. The boom also employs 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.

An ergonomic vibration-dampened cabin provides the operator with excellent all-round visibility, low noise level inside the cab thanks to its acoustic windows, a filtration system to minimise 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 minimise any disturbance for the operator, whilst safety has been maximised with a FOPS-compliant cabin.

To further boost the efficiency of the rig and the operator, 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.

High power and efficiency

The RD535 is a high performance and high frequency rock drill. It has maximised power transfer capabilities, leading to a high drilling speed without compromising hole quality. It also offers an efficient and powerful percussion mechanism, as well as a tool-saving, efficient and stabiliser structure for increased reliability. These features, together with improved flushing and efficient cooling, deliver an uninterrupted high-speed drilling.

The DT1132i is powered by a Cummins B6.7 (168 kW) diesel engine (Stage 5), which can be operated up to 5,000 m above sea level without any modifications. Sandvik said the drill rig is also available with a Stage 3 engine.

The rig utilises a new carrier, which has 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 offers 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, thus 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.

Automated drilling

The DT1132i is available with some of the most recent developments in automation, including the 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 (measurement while drilling).

As ‘Gold’ standard, the DT1132i is fitted 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 visualisation and rig navigation are also included. Apart from these standard features, the rig is also available as part of the ‘Platinum’ package with automatic long hole drilling and fully automatic face drilling.

For face drilling, the DT1132i comes with the new Sandvik Alpha 360 drilling system for the RD535 rock drill. This provides features such as an optimised 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 offers 50% less deviation and increased service life.