EXPANDABLE ROCK BOLT TUBE

摘要

The present invention relates to a rock bolt used for rock reinforcement work, particularly to an expandable rock bolt tube in which: a folding part is formed in a "1" shape inside an expansion part to divide the inner space of the expansion part into two semicircular spaces, an inlet part in which hydraulic fluid is injected is formed in a pipe shape, and the tip of the pipe-shaped inlet part is used as an inlet hole to inject hydraulic fluid so that high pressure fluid can be quickly and easily injected into the expansion part during installation of the rock bolt to reduce installation time thereof. In addition, corrosion of the rock bolt due to residual hydraulic fluid can be prevented by completely draining the hydraulic fluid remaining in the rock bolt through natural drainage after completion of the rock bolt installation.