A hydraulic jack applies load to a high-tensile steel tendon grouted deep into the ground — that is the core of an active anchor. In Christchurch, the equipment moves from site to site across the Port Hills or the flatlands of Addington, but the principle remains the same: transfer structural forces into competent ground. We set up the hollow-core drill, advance through gravel lenses and silty layers, and monitor the injection pressure at every stage. The anchor head assembly, complete with bearing plate and locking nut, gets proof-tested to 133% of the design load before we sign off. For projects requiring lateral restraint in post-quake settings, this is not a theoretical exercise — it is a field operation calibrated to the Canterbury soil profile.
A well-designed anchor bond zone in Riccarton Gravel can transfer 250 kN per linear meter — but only if the grout injection pressure is held above the overburden stress during placement.
