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Prestressed Grouting Bolt
Prestressed Grouting Bolt

 

 

Large quantity of tunnel construction shows that rock loosing and displacement mainly takes place in the surrounding rock of hard rock tunnels, with the characters of small deformation and abruptness. So it's difficult to solve the problems existed in tunnel support of hard tunnel only by hollow grouting anchor, especially in the hard tunnel at jointed fractured zone.
 
Excavated in jointed fractured hard rock results in rock loosing and friction reducing between rocks and thus causes rock loosing in large area, finally collapsing. In this case it is impossible to produce enough axial force to support surrounding rock through rock deformation before rock loosing with ordinary hollow grouting anchor. Prestress must be applied to retain tunnel stability. Therefore MAXDRILL prestressed grouting anchor is developed upon this requirement.

 

Prestressed Grouting Bolt

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