Robit Oyj

Jussi Rautiainen

Jori Montonen

Harri Sjoholm

Mikko Mattila

Mikko Heinonen

Harri SJÖHOLM

A method is disclosed for surveying drill holes with a drilling arrangement and borehole survey assembly. The method can include providing a drill tool having at least one drill rod and a drill bit assembly, and providing a borehole survey tool having a sensor) for measuring a borehole. In the method a drill tool having a central flushing channel for conducting flushing fluid to the drill bit assembly is used, and the borehole survey tool is arranged in the central flushing channel so that flushing fluid can flow in the central flushing channel past the borehole survey tool.

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Valkeakoski, Finland

Jussi Rautiainen