| 摘要 |
One or more breakable cartridges containing a two component resin system are inserted in a bore hole drilled in a rock formation by an elongated roof bolt. An expansion shell assembly is positioned on the end of the bolt and includes a shell formed by a plurality of bendable fingers surrounding a camming plug. The camming plug is threadably engaged to the end of the bolt. A clip member is non-rotatably secured to the shank of the bolt and extends into one of the longitudinal slots that separates the fingers of the shell. After the cartridges and bolt are advanced into the bore hole, the cartridges are compressed between the end of the bore hole and the end of the bolt and fractured to release the resin components. The clip member non-rotatably secures the shell to the bolt and prevents relative rotation between the camming plug and the bolt so that the bolt may be rotated in a counterclockwise direction to effect mixing of the resin components in the bore hole before the shell is expanded without threading the plug off the end of the bolt. The mixed resin flows downwardly in the bore hole and fills the voids between the shell and the wall of the bore hole. Before the resin hardens the bolt is rotated in a clockwise direction to disengage the clip member from the shell to permit downward advancement of the camming plug on the bolt to expand the shell. The cured resin filler increases the engagement of the shell with the wall of the bore hole and thereby reduces the slippage of the expanded shell in the bore hole to thus maintain the tension on the bolt.
|
