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Project Profile Z3010

Christchurch House Raised & Re-supported

Sub-industry
Office Building
Problems
Earthquake induced differential settlement
Location
Christchurch, NZ
Year
2014
Solutions
Ground Improvement
Technology
JOG Computer-Controlled Grouting

Entire House Raised 60mm & Re-supported

Summary

This large residence in Christchurch suffered differential settlement of an average 55mm from the 2010 & 2011 earthquakes. Set on a raft concrete slab, the whole house had subsided and tilted.

It was rectified by Mainmark using JOG integrated computer grouting to raise the building back to within 10mm of its design levels.

Objectives

The house was built adjacent to a creek and there was a high water table in the area. The sandy foundation had liquefied causing subsidence to the house.

Solution

JOG integrated computer grouting was used to raise the floor slab and to even up the differences in settlement across the structure.

Access was difficult, across a light timber bridge over a creek and along a lane shared with neighbours. So the JOG batching & pumping equipment and the project control centre had to be incrementally installed in the garage.

At 56 locations right across the slab, penetrations were cored and injection ports were installed through the concrete slab, for injection of the high mobility grout.

With continuous monitoring by laser level and theodolite, the injection sequence and volumes were controlled to effect an average lift of 55mm. The maximum lift, at the most subsided location, was 66mm.

The project, including establishment and equipment removal, took eleven days. As required, the floor slab was lifted to within specification.

Resources

Download a pdf version of this project here

Entire House Raised 60mm & Re-supported
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