What is micropile?
Micropiles are normally in the diameters of 60 to 300mm. They are often used for underpinning, drilling and grouting. In the middle of Micropiles are usually Threaded reinforcing bars, one piece or several.
The reinforcing bars are solid or hollow core. All thread, can be cut into any length.
METAROLLS HOLLOW THREADED RE BAR OR DRILL HOLLOW BAR SYSTEM
The hollow threaded rebar system is also known as a self-drilling hollow bar system. In this system, the hollow bar can function as a sacrificial drill bit which gets converted to a central reinforcement and can also be used to flush out the debris. This system can eliminate predrilling, frequent removal of pipes and drills, etc and can handle any condition relating to the installation of micropiles. On completing the final stage of drilling, the cement mortar is injected into the hollow core of the drill bit by an injection adaptor (ref fig) mounted with the drilling unit. The grout flushing simultaneously serves in stabilising the borehole and filling the area.