TRY-A Pre-stressed yield bolt
Damping through the nut in the casting resin anchor agent precisely
To the role of stirring, and then pre-stressed.
Let presseure device in a high pressure situation, so that yield tube can be deformed to the pressure, buffer and release the pressure of surrounding rock in order to protect against damage to the role of anchor. In order to get a safety of the laneway supporting.
With spherical washers and coil bolts
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