New tunnelling jumbo for limestone applications 04 May 2016

Sandvik News Release

Tunnelling equipment manufacturer Sandvik introduces a completely new jumbo to its extensive offering: the DT912D.

The versatile Sandvik DT912D tunnelling jumbo
The versatile Sandvik DT912D tunnelling jumbo

Designed especially for limestone applications, this new high reach, single boom jumbo is completely self-contained, powered with a fuel efficient and environmentally friendly Tier 4 Final diesel engine, and equipped with on board compressor and water-tank for air-mist flushing. With the new Intelligent control system it offers increased productivity for both tunneling and underground mine applications.

Offering fast and accurate drifting and production drilling across a of 12–125m2 (130–1345 ft2) cross sections, the 24-tonne jumbo combines Sandvik’s novel technology with experience gained over the decades in the business.

The DT912D features a 25kW (33.5HP) high frequency RD525 rock drill for superior drilling and long-life performance, as well as the most powerful engine ever installed on a diesel-hydraulic jumbo: the 205kW (275HP) Cummins Tier 4 Final. The jumbo has an electric-controlled drilling system fitted as standard, with added automatic functions including one-hole automatics. It is equipped with an SB150 universal boom for large, optimally shaped coverage and full automatic parallelism. In addition to face drilling, the versatile boom can also be used for cross-cutting, bolt-hole drilling and extension drilling.

High reach, single boom DT912D for limestone applications
High reach, single boom DT912D for limestone applications

The unit boasts an efficient 4m3 (141ft3) onboard compressor and an extra-large 1,000 litre (265 gallon) water tank for air-mist flushing, enabling the DT912D to operate independently from the tunnel or mine infrastructure, and guaranteeing longer drilling periods from a single setup. The DT912D also offers rapid, safe and balanced tramming thanks to its powerful, four-wheel drive centally articulated carrier. As an extra option the cabin is available with a lifting system that allows even better visibility for tramming and drilling. The well-proven Sandvik Intelligent Control system Architecture (SICA) – with comprehensive built-in diagnostics and user-friendly controls – ensures ease of use and maintenance.

To ensure best performance, the DT912D offers different instrumentation levels to choose from, thereby optimising its performance in accordance with specific needs. These include the silver package for drilling angles and depth monitoring; the gold package offering semi-automatic drilling according to drill plan; and the platinum package, which has the advantage of automatic boom movements and drilling cycle.

The gold and platinum packages are integrated with the Sandvik iSURE® tunnel management tool for accurate drilling, charging and blasting plans. In addition, the iSURE® provides useful data collection and analysis reports for improving the work cycle and process, and can also be complemented with the new geoSURE rock mass analysis and visualisation system.


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