About
TechSpan precast arches, a versatile solution for durable infrastructure
TechSpan, Geoquest’s signature precast arch solution, delivers unmatched versatility and performance for buried structures across a wide range of civil and environmental application. Engineered for strength, resilience, and durability, TechSpan offers a modular, precast solution that adapts to the challenges of modern infrastructure. Whether you are building a cut-and-cover tunnel, a buried bridge, or designing for resilient flood control, TechSpan provides the flexibility to meet demanding specifications with ease.
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Why choose TechSpan?

  • Custom geometry optimized to each site and load condition,

  • Accelerated installation with precast segments and minimal on-site formwork,

  • Reduced excavation and backfill, minimizing environmental and community impact,

  • Long design life with minimal requirements,

  • Engineered resilience for live loads, hydraulic forces, and seismic activity.

Applications of TechSpan precast arches

Cut-and-cover tunnels

TechSpan is ideal for cut-and-cover tunnel construction where speed and safety are critical. Its modular design allows for fast installation in confined urban or environmentally sensitive areas, reducing disruption to traffic, communities, or ecosystems.
Whether for roadways, rail corridors, or mining hauling or conveyors, TechSpan provides a robust tunnel shell that simplifies waterproofing and backfilling operations.

Flood control and hydraulic applications

TechSpan excels in flood-prone environments, offering engineered resilience in culverts, stream crossings, and river conveyance structures. With high flow capacity and customizable openings, it provides a strong, low-profile solution that withstands hydraulic forces while blending into the natural landscape.
Paired with erosion control or formed concrete mattresses, TechSpan structures support integrated flood mitigation strategies.

Buried bridge structures

When conventional bridge decks aren’t practical or cost-effective, buried arch bridges using TechSpan provide an efficient alternative. These structures are especially suited to crossings with high fill embankments or where a visually unobtrusive solution is preferred.
TechSpan arches distribute loads naturally through soil-structure interaction, allowing for longer service life and reduced long-term maintenance compared to traditional bridges.
Design your TechSpan arch online, in minutes
Quickly define the optimal TechSpan precast arch solution for your project. Enter your project data, refine your design in an interactive 3D environment, and export professional deliverables, all from your browser and with no software to install.
1Select the optimal arch profile
Enter your project requirements, including geometry, loading conditions, and foundation type (strip footing, pedestal, or slab), and instantly identify the most suitable arch profile.
2Customize your design in 3D
Configure arch length, add Reinforced Earth® headwalls and wingwalls, create special cuts and custom endings, and visualize your structure in real time. Concrete quantities and estimated carbon footprint are updated automatically as you refine your design.
3Export your pre-design
Download a complete pre-design package, including a 3D model (.OBJ) and a detailed PDF drawing set with general arrangement views, dimensions, quantities, and key technical specifications.
Your pre-designs are saved to your Geoquest Design account and can be shared with our engineers whenever you need a full design review.