MC-Injekt GL-95 ensures construction progress

• Name

  Excavation pit in Toronto stabilised

• Country

  Canada, 2024

• Categories

  Injection Systems

• Products

  MC-I 710
  MC-Injekt GL-95

At the Dupont Street site in Toronto, soil stability problems were encountered in parts of the shoring wall. The main problem was that the soil collapsed into the pit during the excavation, which led to settlement movements at the surrounding surface that had to be prevented due to the presence of adjacent site equipment. The aim was therefore to stabilise the soil in such a way that the excavation work could be continued, with the lagging work then following. The special feature of this task lay in the confined space conditions on the construction site, which made conventional injection methods impossible. The renowned and MC-certified special foundation engineering contractor EBS Geostructural Inc. from Breslau, Canada, was commissioned by the clients to carry out the injection work to secure the subsoil in the affected area.

Efficient and minimally invasive injection method

EBS got to know the Canadian MC team and the injection systems of MC at a technology presentation where, among other methods, acrylate gel-based injection was presented. EBS’s interest in this technology was further strengthened by a compelling presentation by MC at a geotechnical symposium, which the client and the main designer also attended. EBS and the client were convinced of the method’s effectiveness and used MC’s solution in their Toronto excavation.

Securing the excavation quickly and efficiently

The injections with MC-Injekt GL-95 were minimally invasive and could be carried out on a narrow strip along the shoring wall, as no bulky drilling equipment was required. The acrylate gel MC-Injekt GL-95 impressed with its low viscosity and the ability to adjust the reaction time to precisely control penetration into the sandy-silty, partial gravelly subsoil. During the first three days of application, the MC team trained the applicator on-site to use the complete injection system. This consisted of the acrylate gel MC-Injekt GL-95, the pneumatic injection pump MC-I 710, and an easy-to-handle ram lance system, with which the site team then successfully stabilised the entire excavation area in just two weeks. The injection area extended over a length of approximately 32 m and reached a depth of 5.5 m. Apart from an unexpected cavity, which was also backfilled, the measure went smoothly.

Accelerated construction process

Thanks to MC-Injekt GL-95 and the on-site service provided by the MC team, EBS Geostructural Inc. was able to overcome the challenges of soil stability on the site effectively and on time. Acrylic-based injection proved to be a cost-effective, minimally invasive alternative to conventional cement-based injection methods and significantly accelerated the overall construction process of the modern office and residential building on Dupont Street. A remarkable success for all involved!