Micropiles are small diameter grouted piles (typically less than 300 mm in diameter) transferring compressive, tensile or alternating loads into the surrounding ground. Dependent on the ground conditions, Self Drilling Micropiles are designed either as end-bearing or friction piles.
Self Drilling Micropiles are typically installed via simultaneous drilling and grouting using cement grout as the flushing medium. Particularly in cohesionless or unstable ground conditions e.g. sand, clay or gravel, this is the fastest and most efficient installation method for micropile systems.
Drill bit adapters increase flexibility by allowing the use of drill bits designed for other dimensions of hollow bars.
Spacers are used to centre the hollow bars within the borehole and to ensure the correct grout cover of the load-bearing element according to the relevant standards and as specified in the approvals.
The grout swivels consist of a grout body and a swivel shaft and are attached to the shank adapter. A large variety of grout swivels for all standard types of shank adapters is available. The grout swivels are suitable for simultaneous drilling and grouting.
Coupling boxes (crossover couplers) must be installed between the shank adapter and the hollow bar during the drilling operation.
A CE-approved pull tester is available to test the self-drilling nails and piles after installation of the system and curing of the grout body.
We recommend the use of the M400NT grout pump to produce a grout mixture with a controlled water/cement ratio.
For geotechnical applications, we recommend M440GE pump to produce a grout mixture with a controlled water/cement ratio.
SRNs are typically grouted along their entire length. In geotechnical engineering, they are used to stabilise natural or artificial slopes or to support structures e.g. retaining walls. To further stabilise the surface of the slope or rock, various support systems e.g. flexible reinforcing meshes or geotextiles may be installed that are held in place by the head plates of the nails.
This product was designed to improve the productivity of ground support installation in underground mining and tunnelling applications. Using the pumpable resin enables the load to be taken up in minutes rather than the typical 24 hours from cementitious grouted systems. Typical applications of CarboThix™ include grouting of cable bolts, solid steel or GFRP bolts, self-drilling anchors and one-step bolting operations in automated mode or for consolidation injection works in direct overburden.