Hadlee & Brunton have a custom-built 175T Maxi-rig from Herrenknecht which is one of the most advanced pieces of equipment for horizontal directional drilling in the world today. It is the only European Maxi-rig in New Zealand and can drill up to 1 km in length and up to 2 m in diameter (dependant on ground conditions and length). This rig is used for large bore pipe installations in the utilities sector throughout the country. The technology of this rig far exceeds anything else currently available in New Zealand.
The maxirig has 70,000Nm of torque and 440,000lbs of pullback and thrust!
Unlike a lot of cheaper or Chinese rigs that claim various tonnages of thrust and pullback forces Herrenknecht had Hadlee and Brunton fly to Germany to witness the thrust and pullback tests in the factory to show that the rig is indeed capable of what they claim. The results from these tests proved that the rig well exceeded its 175T rating. This came as no surprise to the Germans as the Hadlee and Brunton rig is built on a 250T rig platform. Throughout the design and build phases representatives of Hadlee and Brunton made several trips to Schwanau in Germany to be part of the process. This resulted in a truly customised machine with the Germans embracing and incorporating suggestions and modifications to the rig throughout the build.