Method for surveying drill holes, drilling arrangement, and borehole survey assembly

摘要

The invention relates to a method for surveying drill holes and to a drilling arrangement and to a borehole survey assembly. The method comprises a first providing step for providing a drill tool (1) comprising at least one drill rod (2) and a drill bit assembly (3), and a second providing step for providing a borehole survey tool (4) comprising sensor means (5) for measuring a borehole (6). In the method a drill tool (1) comprising a central flushing channel (8) for conducting flushing fluid to the drill bit assembly (3) is used, and the borehole survey tool (4) is arranged in the arranging step in the central flushing channel (8) so that flushing fluid can flow in the central flushing channel (8) past the borehole survey tool (4).