OUR PROJECTS /grand_arcade_nbs remediation /

Grand Arcade NBS Remediation Works

This building has eleven floors and lift shafts that all require strengthening work.


  • Currently over 40 different bracket types being used
  • Over 1000 individual brackets fabricated and installed
  • Cable system used as backup to concrete panel fixings


This job is similar to a number of Seismic Strengthening projects we have completed in Wellington City Buildings. Problems requiring a bracket design change are common and a number of the brackets have been designed, site measured and fabricated with minimal lead time. Some brackets are turned around from design to installation within a week.

Cable Backup System

On this job, we installed some unique brackets with features that we haven’t seen before.

The brackets that secured the concrete tilt slab panels had a secondary safety feature. Should the primary fixings fail in a large seismic event, an attached steel cable stops the panels from falling out completely. This gives contractors time to either reattach the panels or lower them to the ground.

It is not uncommon to see innovative solutions like this used to resolve the type of problems that come up in seismic strengthening. This is the advantage of using people experienced in this type of work; they have on-site experience and know the range of potential solutions to the unique problems that are common when strengthening an existing structure.

Client: Hawkins 2017 Ltd
Location: Willis Street, Wellington Central
Consultant: DTE Consulting Engineers


Read more about our other signature projects

Petone Engineering is a leading provider of structural steel and seismic strengthening, having delivered an impressive portfolio of projects across the lower North Island and beyond.