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苏联研制成一批试验用气动扩孔器并进行了工业试验。该钻具在直径达155毫米的超前孔中,可用来钻进中硬和坚硬岩石的直径300毫米和更大的通风孔和其他孔。扩孔器结构不复杂,制造和操作简单。利用 M 29 T型风动冲击器
The Soviet Union developed a number of experimental pneumatic reaming tools and carried out industrial tests. The drill can be used to drill medium-hard and hard-rock vents and other holes 300 mm in diameter and larger in advanced holes up to 155 mm in diameter. Reamer structure is not complicated, easy to manufacture and operate. Use M 29 T-type pneumatic impactor