Delta Modular Steel Bridge

The Delta Modular Steel Bridge is a long-span, high-load-capacity truss bridge characterized by its deep triangular truss structure. This triangular web configuration is not merely an aesthetic choice; it is the key to achieving exceptionally long spans, allowing the bridge to span great distances using only a compact, easily transportable set of components. For single-lane truck loading, the bridge can span between 50 and 80 meters without the need for intermediate piers-a capability typically associated only with permanent steel truss bridges.

This bridge is specifically designed for engineering teams and organizations that need to cross wide rivers, valleys, or railways-scenarios where traditional Bailey bridges would otherwise require multiple rows of temporary intermediate supports. The Delta Modular Steel Bridge combines the rapid installation advantages of a modular truss system with a spanning capacity that rivals permanent structures. It serves as an ideal solution for temporary or semi-permanent applications, meeting the requirements for long spans while avoiding both the high costs of permanent bridges and the complexities of construction within water bodies.

Deep delta-truss geometry delivers long single spans from compact panels. The delta modular steel bridge makes this practical.

S460 steel keeps component weights manageable even at full depth.

No intermediate piers needed for wide rivers and valleys.

Standard launching erection avoids in-water crane work.

Duplex coating and permanent abutments give a long service life.

Compatible with standard bailey accessories and trestle systems.

Ships as a repeatable, compact component set your crew can re-run site to site.

Here's where the Delta earns its name. The web members form a series of triangles - that delta arrangement - and triangles are the most efficient shape you can build a truss from. Load flows cleanly along each diagonal, so the truss resists bending with surprisingly low chord forces for its depth. The deeper 2.5–3.0 m panel profile stretches the lever arm between the top and bottom chords, which means a given moment is carried with less steel than a shallow truss would need. The delta modular steel bridge is built for this.

On the deck, a vehicle's weight runs through the floor beams into the paired longitudinal trusses. The triangular web then spreads that load as axial tension and compression, keeping every member working near its efficient limit. Cross-bracing and wind ties hold the deep lines steady against side loads.

Erection is the familiar modular routine: we build the truss on one abutment and launch it out with a launching nose, cantilevering over the gap until it seats on the far side. When the crossing runs past 150 m, intermediate bailey trestle piers chop it into simply supported segments that are easy to handle.

We can tailor our Delta Modular Steel Bridge to meet your specific crossing requirements. The deck width can be configured as 4.2 meters (single-lane) or 7.3 meters (double-lane). For the span, you may opt for a single-span structure of 60–80 meters, or achieve a total span exceeding 150 meters by incorporating intermediate piers. The load-bearing capacity will be determined based on your anticipated traffic composition, and we will provide suitable abutment and bearing solutions tailored to your site's foundation conditions. The bridge components are galvanized in accordance with the ISO 1461 standard and finished with a standard polyurethane topcoat; additional surface treatment options are available for more demanding environmental conditions. We can construct the bridge based on your provided drawings or offer our own custom designs. All components are designed to fit into standard shipping containers, and we can dispatch on-site engineers to assist with the planning and execution of the bridge erection process.

The Delta is a deep through-truss girder whose triangular web members form the efficient delta shape that gives the bridge its name. Paired longitudinal trusses carry the load, with reinforced top and bottom chords and heavy shear connectors passing the forces between deck and web. Transverse floor beams pick up vehicle weight and feed it into the trusses, while cross-bracing and wind ties keep the deep lines steady against side loads. At each end, fixed, guided, and rocker bearings sit on concrete abutments and let the span move with temperature. Continuous steel deck panels - with an optional asphalt wearing course - form the running surface on top of the floor beams.

Typical uses include single-span crossings over wide rivers without in-stream piers; bypass bridges during major permanent-bridge replacement; crossings over railway corridors, highways, or dense urban areas; emergency long-span bridges after floods, earthquakes, or storm damage; and access bridges for dams, reservoirs, ports, and industrial sites where intermediate piers would obstruct operations or navigation.