Lifting a building is not a straightforward task as many variables come into play. Often, structural engineers opt for traditional concrete underpinning, as a way to mitigate the risk of ‘over-lifting’ which can be damaging. To re-level a building accurately and safely, engineers need a precise degree of control.
Mainmark implements its highly precise and effective JOG Computer-Controlled Grouting technology, which makes it possible to substantially lift a building’s foundations, back to level, while not impacting the surrounding area, this degree of accuracy is crucial. To achieve this, multiple small injection ports are installed throughout the foundations of a building and along the structural pads of the subsided section. Through these ports, JOG high mobility cementitious grout is injected slowly, under precise monitoring. Injection takes place via multiple ports a few seconds at a time, to gently raise the structure in a uniform and incremental way, effectively “floating” the structure, a millimetre at a time.
The monitoring data from the manual or robotic system is fed back to the controller who alters the program in the computer and directs the flow of grout to the individual injection ports.
In some cases, to successfully lift a building safely and accurately, a two-pronged approach may be needed. Mainmark’s proprietary Teretek resin injection solution can be used to fill any voids, raise the floor level or provide additional ground improvement below or around the JOG injection area. Teretek is unique in that it delivers both ground improvement and re-levelling with a fast, non-invasive process likened to key-hole surgery. As with JOG, constant monitoring of the process ensures that it is successful.