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🌉 Engineering Focus: Precast Portals, Uneven Backfill and Skewed Installations

At ABM Precast Solutions, we often work on projects where ground conditions are far from ideal. A recent project showcased two common challenges: uneven backfill and a skewed portal installation.

Why does this matter?

🔸 Uneven Backfill:

• Creates asymmetric loading on the portal structure

• Can cause differential settlement, especially in the centre rings

• May result in some units being supported only by the shear key over time

• Requires careful design and installation sequencing

🔸 Skewed Installations:

• Further complicates load distribution

• Increases design complexity, often needing extra reinforcement or thicker slabs

• May require bespoke stitching between head walls and portal units
How did we solve it?

✅ Collaborated closely with the contractor to understand site constraints

✅ Designed a bespoke precast portal to accommodate both the uneven backfill and the skew

✅ Delivered a solution that met both structural and programme requirements
If you are facing similar technical challenges, our team is ready to help with practical, engineered solutions.

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