Some of the most important work on a project happens where nobody can see it.
At our District Docklands project, we’ve commenced micropiling works to strengthen the foundations of an existing building while the facility remains fully operational above. It’s a critical stage of the project, designed to increase the structure’s load capacity and support future demands without interrupting day-to-day operations.
Over the coming weeks, our team and Keller will install 30-metre-deep micropiles beneath the building in a highly constrained environment. The challenge isn’t just the depth. It’s delivering the work safely and accurately within limited access zones, low head heights and around live services, all while business continues as usual above ground.
Projects like this show why planning, coordination and quality assurance in building construction matter long before a building starts to take shape.
The biggest constraint was the one we couldn’t change. The building had to remain operational throughout the works, so every aspect of the piling strategy was built around maintaining business as usual above us.
Limited access, low head heights and a complex network of live services meant conventional piling methods weren’t practical. Instead, we partnered with Keller to deliver a micropiling solution capable of working within those constraints while still achieving the required structural outcomes.
It’s the type of work that demands constant coordination. Every pile location, access route and work sequence needs to be carefully planned before drilling begins. When you’re strengthening an existing structure from below, there’s very little room for adjustment once work is underway.
Micropiles, sometimes called minipiles, are small-diameter drilled piles used where conventional foundations aren’t practical, particularly on constrained or live sites.
At District Docklands, each micropile is drilled precisely to its design depth, reinforced with steel and grouted to transfer structural loads safely into the ground. Depending on project requirements, micropiles can provide significant load capacity while requiring far less space than traditional piling systems.
The ability to install them within restricted access zones makes them particularly effective for foundation strengthening works beneath existing buildings.
For this project, specialist rigs and tooling allow works to proceed safely and efficiently despite the tight working conditions on site.
Success on a project like this starts well before the piling rig arrives.
Extensive planning and 3D modelling allowed our team to coordinate pile locations, understand existing conditions and carefully manage interfaces with live services. Identifying potential conflicts early meant we could sequence works appropriately and reduce risk before construction began.
It’s a practical example of the benefits of digital engineering on complex projects. Detailed modelling gives teams a clearer understanding of constraints, helping inform decisions around access, staging and constructability.
Many of the same principles used in BIM in construction apply here. The more certainty we can create before work reaches site, the better positioned the team is to deliver safely and efficiently.
Foundation strengthening only works if every pile performs exactly as intended.
That’s why quality control isn’t something checked at the end of the process. It’s built into every stage of construction.
Daily drilling and grouting records are maintained throughout the works, capturing information such as pile identification, location, soils encountered, grout volumes and grout pressures. Reinforcing steel is installed before high-strength grout is placed, creating the load transfer mechanism required by the design.
Grout samples are also collected and tested in accordance with applicable Australian Standards to verify strength requirements have been achieved.
These records provide traceability throughout construction and form a critical part of quality control in building construction, particularly for structural elements that will remain hidden once the project progresses.
Construction records tell part of the story. Testing confirms the result.
Following installation, load testing is performed to verify pile performance against the design requirements. In many cases, test piles are loaded to twice their design load to confirm capacity.
Instrumentation can also be used to measure how loads transfer through the ground and how the pile behaves under testing conditions. The result is measurable evidence that the foundation system is performing as intended.
That combination of planning, documentation and verification gives clients, consultants and project teams confidence that the work below ground will continue performing long after construction is complete.
Micropiling may not be the most visible stage of a project, but it’s one of the most important.
At District Docklands, these works are creating the foundation capacity needed for the next stages of construction while allowing the facility to remain fully operational throughout the process.
It’s a good example of how detailed planning, digital coordination and specialist expertise come together to solve complex construction challenges. By understanding the constraints early, coordinating closely with our partners and maintaining a strong focus on quality, we’re strengthening the building from the ground up while business as usual continues above us.
