A 2,200-tonne bridge span, one weekend, and 176 axle lines of SPMTs in Budapest
Mammoet installed the first 2,200-tonne span of Budapest's new Közvágóhíd railway bridge over Soroksári út in a single weekend, using self-propelled modular transporters to keep the arterial road's closure to a minimum.
Between Friday morning and Monday morning rush hour, the Dutch engineering firm Mammoet installed the first of two 2,200-tonne, 108-metre-long bridge structures forming the new Közvágóhíd railway bridge over Soroksári út in Budapest, Hungary, rolling the span into position on self-propelled modular transporters (SPMTs) and handing the road back in time for the Monday commute. The closure was held to a single weekend rather than weeks or months, and the engineering was arranged around that fact.
The new bridge is part of the Ferencváros–Kelenföld railway line capacity expansion project, and Soroksári út is a main arterial route — the kind of road a city cannot simply hand over to a construction site for the duration. Heavy work beside live traffic is normally a negotiation between two budgets: how long the ground stays occupied, and how much of the job can be completed somewhere else first. Fixing the first number in advance, at a single weekend, meant the second number had to absorb nearly everything else — a constraint that shaped the method at least as much as the load itself did.
Inside that window, the span travelled on 176 axle lines of SPMTs working in a rotation system. The arrangement avoided the need for temporary support towers and 20-metre piles drilled into the road — works whose construction would have kept the main arterial route closed far beyond a weekend. Support towers and piles are not weekend-sized work: they have to be built before the span arrives and taken down after it has gone, and the road stays shut for all of it.
The equipment choice shows up in the rest of the logistics too: installing the span on SPMTs rather than a skidding system minimized the civil works required and streamlined the bridge launch. The bridge sections were fabricated close to the installation site, keeping the disruptive movement of large components to a minimum. None of it is glamorous — it reads as a schedule being defended one decision at a time.
The second span — the same 2,200 tonnes and the same 108 metres — is still to come before the new bridge stands complete. However that move is staged, this first weekend has set the template: do the slow work somewhere else, and occupy the road only for the hours that genuinely need it.
The eye-catching figure in this story is 2,200 tonnes. The figure that actually shaped the engineering, though, is the width of the closure window — the difference between occupying a main arterial route for weeks or months and surrendering it for a single weekend. The SPMT fleet, the rotation system and the fabrication kept close to the site are all complexity accepted up front so that the time the city loses stays small. Spend engineering to buy back days: that bargain is how heavy construction fits into a city that has to keep moving.