| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide drilling equipment for enabling compact construction while eliminating the need for a rotation driving device special for a ground construction tool. <P>SOLUTION: The drilling equipment includes a tube rotating device 1 for pushing a casing tube 4 down to a ground GR while rotating it. It further includes a drilling bucket 51 and a bottom enlarged bucket 52 as ground construction tools capable of being inserted into the casing tube 4, and of being rotated to construct the ground GR in the state of being connected to the front end of a shaft-like kelly-bar 6, and a speed increasing gear 2 connected to the casing tube 4 for shifting the rotation of the casing tube 4 and transmitting it to the kelly-bar 6 being inserted into the casing tube 4. <P>COPYRIGHT: (C)2013,JPO&INPIT |
