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New Zealand
Sub-industry
Office Building
Problems
Earthquake induced differential settlement
Location
Christchurch, NZ
Year
2014
Solutions
Ground Improvement
Technology
JOG Computer-Controlled Grouting
Residence Re-levelled by JOG & USL
Summary
This residential property was located in one the areas of Christchurch hardest hit by the earthquakes of 2010-2011. The foundation soil was mainly non- cohesive silty-sand and the watertable in the area was generally just a metre or less below ground level.
Mainmark rectified the substantial settlement, with JOG Computer-Controlled Grouting under the load- bearing elements and Uretek Slab Lifting expanding resin injection under the floor slabs
The structure was raised an average 33mm back to its design grade.
Objectives
The whole house was to be brought back up as close as possible to the design grade and re-levelled.
Solution
28 JOG injectors were installed to inject beneath the load-bearing elements of the building.
Different injector were also installed through the non- load-bearing floor slabs to to raise them by means of Uretek expanding resin injection.
The two injection processes were applied at the same time. This way the entire building was brought up, very gradually, without placing any uneven stress on the structure.
The average lift was 33mm and the greatest was 44mm.
The JOG process was completely successful, as was the Uretek Slab Lifting of the non-load-bearing floor areas.
An average lift of 33mm was achieved, as required to bring the structure back to its design grade.
Resources
Download a pdf version of this project here
Residence Re-levelled by JOG & USL
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Supermarket Raised 180mm & Re-levelled
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Mainmark Ground Engineering (NZ) Ltd
