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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
Large House Re-levelled by JOG and Uretek Resin
Summary
This large residential property in Christchurch was subsided and tilted, due to earthquake liquefaction. With a combination of the JOG computer controlled grout and Uretek expanding structural resin injection, the house was back up to level in 18 days.
Objectives
The Earthquake-induced, differential subsidence of as much as 58mm, had occured right across the raft slab construction of this home.
Solution
JOG injection was carried out via 55 injectors installed under the load bearing footprint of this large house. Under the floor slab, Uretek expanding resin was injected to bring those areas up at the same time as the structural load-bearing elements. This Mainmark treatment complemented very fine controlled lifting of defined areas as well as undersealing the slabs and filling the voids created by the JOG lifting.
The two-technology lifting process was completely successful. The property was raised very gently back to the required level.
Resources
Download a pdf version of this project here
Large House Re-levelled by JOG and Uretek Resin
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Christchurch House Raised 60mm & Re-supported
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Mainmark Ground Engineering (NZ) Ltd
