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This 2-storey structure of mostly tilt slab construction had suffered earthquake liquefaction and subsidence. Jet Grouti
via a fully automated Trimble monitoring system and manual assessment. The high degree of monitoring was a key contribut
and a significant void had formed under one side of the building. The body corporate arranged a geotechnical site invest
commercial building in Christchurch needed re-levelling after earthquake subsidence. Objectives. The concrete slab-on-gr
Apartment Building Extensions in Two ... whose reinforced concrete frame constructions often rival the host buildings in terms of size and function. ... provide some of the best examples of such a situation, as they ... and material sites. Still, the
Summary. The concrete slab ground floor slab of an occupied commercial building in Christchurch needed re-levelling afte
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the historic building by using STRAAM (STructural Risk Assessment And Management) real-time structural monitoring techno
This two-storey commercial building with a footprint of 510m2 had walls built of precast tilt-panels and had suffered si
The central core of the structure rested on the central raft foundation with the external columns founding on a continuo
ongoing basis, 24 hours a day, 7 days a week to ... undertaken on August 26, 2017, and continuous 24/7 monitoring commen
Multi Story Building Re-levelled by JOG continued. Z14 Y435. All injectors were connected to the central computer contro
Apartment Building Subsidence Remediated - Mainmark
Above, left: Typical JOG site control centre with computer controls, slurry tanks and pumping equipment. Above, right: A
PROJECT PROFILE Z13 Y180
Apartment Building Subsidence Remediated 1.
2.
3.
4.
INDUSTRY
Commercial STRUCTURE
Apartment building PROBLEM
Earthquake remediation LOCATION
Christchurch, New Zealand DURATION / YEAR
20 days / 2013 TECHNOLOGY
Jet Grouting & JOG ComputerControlled Grouting BUSINESS UNIT
Mainmark New Zealand Above: 1. Technicians and engineers inspect the site. 2. Jet Grout injection from very confined spaces. 3. A larger machine Jet Grouting from a more spacious area. 4. Cement batching plant: high speed mixing equipment in front and cement silo behind. This plant can produce and deliver 24m3 of cement slurry per hour.
Summary A shallow, weak soil stratum under a heavy-weight concrete six-storey apartment block in Christchurch had caused the building to suffer differential settlement of up to 70mm after the recent earthquakes. It was rectified using Jet Grouting to strengthen the foundation ground and by using JOG Computer-Controlled Grouting to raise the building back precisely to its design levels.
Objectives Firstly to strengthen the entire foundation ground and secondly, to correct the settlement and precisely re-level the whole building.
Solution 1. Jet Grouting method. Installation of 22 Jet-Crete columns under the critical load points of the building to support and transfer loads down to the gravels. (These columns are sometimes called “soil- crete”, being a mix of cementitious grout and in-situ soil). 2. JOG Computer-Controlled Grouting levelling method. The computer-controlled grout levelling system was used to level the differential settlement of the structure. 20 injection ports were installed through the concrete foundations, down to the top of the Jet-Crete columns, where the high mobility grout was introduced.
PROJECT PROFILE Z13 Y180
Apartment Building Subsidence Remediated continued
It took 10 working days to set up, install the 22 columns and then remove the Jet-Crete equipment. A further 10 working days were required to install the JOG Computer-Controlled Grouting levelling equipment, level the building back to the agreed lift requirement and then remove the equipment. The building was brought back exactly as required with the foundation ground greatly strengthened to better protect the structure from future seismic activity.
Above, left: Typical JOG site control centre with computer controls, slurry tanks and pumping equipment. Above, right: Angular insertion of JOG injector.
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