| 摘要 |
An elongated rod with an expansion shell assembly positioned on the upper end thereof is advanced into a bore hole drilled in rock formation behind a resin cartridge system. The lower end of the rod is connected by a coupling to the upper end of a bolt having a bearing plate positioned on a lower end of the bolt emerging from the bore hole. Unitary rotation of the rod and bolt in a preselected direction while maintaining the shell assembly in an unexpanded condition effects mixing of the resin components in the bore hole. Continued rotation of the rod and bolt after the resin components are mixed effects expansion of the shell into engagement with the wall of the bore hole to anchor the rod in the bore hole. Continued rotation applied to the bolt after setting of the shell shears a pin in the coupling to permit the bolt to rotate relative to the anchored rod and move the bearing plate on the end of the bolt upwardly into compressive relation with the rock formation to put the bolt and the rod under tension without interrupting the rotation to allow the mixed resin to cure.
|
