|Drill-through pilot bit
This Symmetrix system is ideal for making short rock sockets with the pilot bit. This is available in retrievable and non-retrievable versions.
This specialized Symmetrix system is made for horizontal and break-through drilling. The ring bit is recoverable. Available for drilling 139 to 1220 mm (5 1/2” to 48”) casings.
|Skin friction piles
In this method, drilled casings are pulled out after concrete is poured in. The pile is caseless utilising the uneven contact between the ground and the poured cement slurry. Retrievable Symmetrix with ring bit sets are used for casings from 89 to 1220 mm (3 1/2” to 48”).
A common method of piling where the casing is drilled into a rock socket using Symmetrix with non-retrievable ring bits. Ideal for drilling 114 to 1220 mm (4 1/2” to 48”) casings. A welding ring option is availible from 219 mm casings while ring bit sets are availible from 139 to 194 mm (5 1/2” to 7 5/8”) casings.