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New Zealand
Sub-industry
Residential Apartments
Problems
Earthquake induced differential settlement
Location
Christchurch, NZ
Year
2020
Solutions
Ground Improvement
Technology
JOG Computer-Controlled Grouting
Shopping & Office Complex Re-levelled
Summary
Due to siesmic events, this pair of buildings, that make up a small shopping and office complex, had each subsided, tilting backwards quite markedly.
Mainmark rectified the settlement, with JOG integrated computer grouting, lifting the load-bearing elements, with Uretek expanding resin injection, undersealing and re-levelling the floor slabs.
The two buildings were raised simultaneously, the project taking 22 days.
Objectives
The rear of the building pictured on the left subsided and tilted 153mm, and the one on the right sunk 67mm, in the earthquakes of 2010-2011.
The building structures themselves were not substantially damaged but the subsidence was reasonably severe.
Solution
84 JOG injection ports were installed to inject beneath the load-bearing elements of both buildings.
Different injectors were also installed to raise the non-load-bearing floor slabs by means of Uretek expanding resin iniection.
The two injection processes were applied at the same time, beneath both buildings. This way the entire complex was brought up, very gradually, and without placing any uneven stress on the structures.
The preparation and establishment plus the final disassembly and removal took approximately 4 days and the iniection took 18 davs.
The combined JOG and Uretek processes were successful in raising and re-levelling the entire building complex.
Substantial saving of time and cost was achieved by raising the two buildings simultaneously.
Resources
Download a pdf version of this project here
Shopping & Office Complex Re-levelled
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Warehouse Earthquake Damage Remediated
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Mainmark Ground Engineering (NZ) Ltd
