Process for producing a double-walled drilling rod, and double-walled drilling rod produced by the process

摘要

The invention relates to a process for producing a double-walled drilling rod, the interspace between the outer and the inner tubes being filled by a sealant, characterised in that, for this purpose, use is made of a compressible sealant which can set under occlusion conditions and consists of additives and inorganic binders.