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New Zealand
Sub-industry
Office Building
Problems
Earthquake Remediation
Location
Christchurch, NZ
Year
2014
Solutions
Ground Improvement
Technology
Deep Injection, JOG Computer-Controlled Grouting
Large Building Re-levelled by JOG & UDI
Summary
This two-storey commercial building with a footprint of 510m² had walls built of precast tilt-panels and had suffered significant earthquake subsidence.
In three weeks, Mainmark rectified the settlement, by applying JOG integrated computer grouting and injections of Uretek expanding structural resins.
Objectives
To raise and re-level the building precisely. It was essential to avoid any disturbance to the neighbouring building which was only 200mm from the rear wall.
Solution
A continuous JOG circuit of 64 injection ports was installed. We proceeded with a sustained sequence of injections of JOG cementitious grout. And over 14 days of very careful lifting the building was gradually raised and re-levelled.Continuously monitored and computer-controlled, the lifting of this heavy structure was uniform and gentle. The average total lift was 59mm and the maximum lift in one location was 82mm.
Uretek Deep-injection was then undertaken to fill any voids in the foundations and to ensure full support for the floor slabs. Injections were made to a depth of 4,000mm; this part of the project taking 16 days, partly overlapping with the JOG work. The project was completely successful. The building was raised and re-levelled to the client’s complete satisfaction. There was no disturbance to the neighbouring building.
Resources
Download a pdf version of this project here
Large Building Re-levelled by JOG & UDI
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Large Christchurch House Re-levelled by JOG
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Mainmark Ground Engineering (NZ) Ltd
