| 摘要 |
An apparatus for drilling annulus ring hole, comprising: a down-the-hole (DTH) percussion hammer assembly, the DTH percussion hammer assembly comprising one or more DTH percussion hammers, an annulus ring structural housing having an outer diameter (OD) and an inner diameter (ID) for accommodating the DTH percussion hammers within space between the OD and the ID of the annulus ring structural housing; one or more drill pipes being connected serially with each other forming a string of drill pipes, the string of serially connected drill pipes being connected to the DTH percussion hammer assembly; a top pipe with one or more exhaust openings being connected to the string of serially connected drill pipes; an air or fluid distributor being connected to the top pipe; and a rotary head providing rotational turning motion for the apparatus, and the rotary head being connected to the air distributor. |
