This contractor replaced traditional PE100 pipes with Glass Reinforced Plastic (GRP) pipes in steel viaducts. GRP is a newly emerging material that offers superior structural performance, allowing for longer unsupported spans.
As a result, the number of pipe hangers required has been reduced from 211 to 102, with supports now only needed at the level of the transoms (transversal beams) within the viaduct. This change significantly reduces embedded carbon associated with hanger manufacturing and simplifies installation due to the lighter weight of GRP pipes. Additionally, GRP pipes are expected to require less maintenance over their lifespan, contributing to long-term operational efficiency.
This demonstrates a proactive approach to reducing carbon emissions in construction by optimising design and material selection. Implementing GRP pipes at a late stage in the project shows adaptability and commitment to environmental responsibility.
Manufacturer studies indicate that GRP pipes can withstand the expected stress conditions and may exceed the originally planned 60-year design life. This extended durability translates to fewer repairs and lower maintenance demands, further minimizing the environmental impact of the HS2 project.
The reduction in steel usage and embedded carbon through fewer hangers is a direct result of the material’s improved span capability, which is not achievable with PE100 pipes.
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