| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a rock bolt capable of exhibiting a sufficient fastening effect even when the rock bolt is installed at an angle with regard to an installation surface in an expansion type rock bolt.SOLUTION: An inventive rock bolt includes: a bolt body consisting of an irregular-shaped steel having an internal space, provided with a recess at least at one place in its cross-section, with the recess being plastically deformed and expanded by injecting a pressurized fluid into the internal space, and closed at one end; a fixing sleeve fixed to the other end of the bolt body and having an injection hole for the pressurized fluid communicating with the internal space of the bolt body; a washer having a contact part in contact with the installation surface of the bolt body and a through-hole in which the bolt body is inserted, the through-hole being separated from the installation surface in the axial direction; and a seat receiver fixed to the fixing sleeve and having a contact surface capable of contacting with the through-hole of the washer from a surface on the side opposite to the installation surface in an inclined state.</p> |
