Overview 

Mainmark delivered ground improvement works at a new Next retail retail unit in Canterbury to enable the installation of a new mezzanine floor to extend their floor space.

With 60 columns designed to bear directly onto the existing slab, Teretek® resin injection was used to improve the bearing capacity of underlying soils to depths of up to 2m. The works were completed within a single 7-day mobilisation, with minimal disruption to ongoing construction activities.

Challenges

• Increasing capacity bearing beneath 60 column locations

• No provision for new foundations

• Made ground present to ~2m depth

• Working within a live construction environment

• Restricted access area (<150m²)

• Coordination with services and drainage

• Requirement for validation testing

Solution 

Mainmark implemented Teretek® resin injection to strengthen and densify the ground beneath each load point.

Technical approach:

• Service detection and CCTV drain monitoring

• Pre- and post-treatment DCP testing (Pagani DPM30)

• Installation of 16–20mm injection points through the slab

• Resin injection to depths up to 2m

• Real-time digital monitoring of injection data

Ground improvement achieved through:

• Void filling and soil densification

• Increased stiffness and cohesion

• Formation of a composite resin-soil matrix

Outcome

Completed within programme, the works delivered:

• Improved ground at 60 column locations

• Increased load-bearing capacity for mezzanine installation

• Uniform treatment to ~2m depth

• Minimal disruption and no excavation

• Efficient delivery within a compact footprint

Validation via dynamic probing results, recorded injection data and controlled ground response during treatment

David Hedley, Infrastructure Lead says:

'This project highlights the value of our Teretek® solution as a fast, cost effective alternative to traditional foundation methods. We were able to complete the works with minimal impact on the wider programme, while maintaining flexibility within a constrained environment. The fully monitored nature of our process also gives clients confidence in the performance and reliability of the outcome .”

Sustainability and  Asset Performance

• No spoil or excavation

• Reduced materials and carbon impact

• Efficient reuse of existing slab

• Long-term ground performance

Client benefitted from a fast, cost-effective alternative to new foundations, with minimal impact on programme and other trades. This flexible approach for constrained environments

Planning on adding a mezzanine level to your warehouse, office or retail unit?

Talk to our team about how our ground strengthening solutions can help reduce risk, improve programme certainty, and deliver long-term performance. Call 0800 975 0507