DT1231i Tunneling jumbo

Sandvik DT1231i Tunneling Jumbo for underground mining

Sandvik DT1231i three-boom, electro-hydraulic jumbo is designed for fast and accurate drilling in tunneling and cavern excavation. The computer-controlled rig has automatic drilling functions and operator-controlled boom positioning. It drills holes with a diameter of 45 to 64 millimeters (1 ¾ to 2 ½ inches) with a depth of up to 6.1 meters (20 feet).

Sandvik DTi jumbos are fast, accurate and user-friendly. Together with the iSURE tunnel management program, intelligent iDATA control system, newly launched high frequency Sandvik RD525 drills, robust booms and advanced drill string guides, they offer an excavation result of the highest quality with a low operating cost.

To further improve the excavation process, remote access via WLAN can be chosen. This allows web-based data transfer as well as online MWD. The DTi design also offers ease of service, allowing you to minimize maintenance downtime. The components are damage-protected, and all daily service points are accessible from the ground level.


  • Advanced, user-friendly iDATA control system
  • Automatic boom movements, pre-planned drilling patterns and data collection offer productivity control
  • Noise and vibration-insulated cabin offers comfort and excellent visibility
  • RD525 series rock drills deliver superior performance with high consumable life
  • Dynamic correcting redirects drilling during boom movement and helps keeping the hole bottom in place
  • Lock-to-target: Helps finding the hole position quickly and accurately
Technical data
Tunnel size 11,900 - 19,100 mm (468.5 - 752 in.)
Coverage area 20 - 211 m² (215 - 2,271 ft²)
Hole diameter 45 - 64 mm (1 ¾ - 2 ½ in.)
Hole length Up to 6,085 mm
Rock drill RD525, 25 kW (33.5 hp)
Control system iDATA
Boom 3 x SB150i
Elevating boom support YES
Feed 3 x TF5i, 12 - 21 ft
Length 17,780 mm (58 ft) with default feed
Width 3,860 mm (12.7 ft) drilling
3,050 mm (10 ft) tramming
3,050 mm (10 ft) transportation
Height 4,670 mm (15.30 ft) drilling
3,670 mm (12 ft) tramming
Weight (depending on options) 45,500 kg (100,310 lbs) basic
49,500 kg (109,128 lbs) with utility boom