STANDARD SPECIFICATION
Bar
Deformed type 2, high yield bar to BS 4449: 2005 (grade 460).
Available in diameters of 16mm, 20mm, 25mm, 32mm and 40mm.
Length of thread 150mm.
Plate
Dished plate and hemispherical washer to BS EN 10025: 2004
grade S275 JR.
Plates available in sizes 150 x 150 x 8 thick or 200 x 200 x 10 thick.
TYPICAL HOLLOW THREAD BAR
ROMTECH's Hollow Bar system is a continuously threaded left hand steel bar which can be drilled and grouted into loose, unstable and collapsing ground. The steel is a hollow configuration to allow for simultaneous drilling and grouting, a technique designed for eliminating the need for pre-casing, therefore increasing the installation rate.
Produced from hollow steel tubular raw material, the bar is cold rolled into a standard ISO rope thread during which the formation of steel is enhanced, providing the yield strength. The rope thread provides an appropriate surface between the bar and the grout, therefore enabling a strong, resilient bond to be created.
ROMTECH Self Drill Hollow Bar provides effective solutions for rock bolting, ground anchoring, micro piling, soil nailing and spiles applications
Hollow Bar Technical Data
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