Commitment at Darmstadt: 320-ton bridge brought in

Commitment in Darmstadt: 320-ton bridge brought in

320 t bridge replacement carried out especially efficiently

For the entire operation click here to see the film.

On behalf of IHT Ingenieur-, Hoch- und Tiefbau GmbH / Arge Ersatzneubau EÜ Mainzer Straße in Darmstadt, Riga Mainz replaces outdated railway bridges of the Deutsche Bundesbahn. SPMT axle lines from SCHEUERLE and a very special lifting system allows Riga Mainz, the crane company and heavy goods transporter, to work particularly economically and quickly.

Replacing a railway bridge in need of renovation with a new, 320 tonne concrete structure in just one weekend without removing the overhead lines, was the very special task for Riga Mainz. The bridge is just one of eight that run parallel to each other and cross Mainzer Strasse in Darmstadt. The crane and heavy-duty company from Mainz is to gradually replace them all. The catch: While the first bridge is still close to the road, each subsequent overpass moves six meters deeper into the track bed. "We could still lift the first few bridges from the road with a mobile crane. But we can't reach the bridges further behind the road. At least the use of a crane with the appropriate reach would be very complicated and expensive. That is why we were looking for a more economical solution," explains Uwe Langer, Managing Director of Riga Mainz.

SPMT enables Riga Mainz to work particularly efficiently 
The Mainz-based company had one year to develop an economical solution for this complex combination of transport, demolition and assembly. SPMT (Self Propelled Modular Transporter) from SCHEUERLE are an important component of this application. A side girder bridge between the two, electronically connected transport platforms serves as a support for the new concrete bridge. A total of 20 SPMT axle lines are required to carry the total load of 570 tonnes. Riga Mainz installed a self-developed process technology with a lifting capacity of 500 tonnes on the side girder bridge, which according to the company is unique in Germany. A further advantage of the lifting system (patent pending) is its relatively low overall height. The transport including the load can therefore pass safely under the overhead lines. This saves the client a lot of time and significant costs.

Multi-way steering enables the bridge to be driven in laterally 
The approach of Riga Mainz is just as well thought-out as transport modules and lifting technology. "We drive the two SPMT platforms on the road under the old bridge, separate them from their anchorages and then push them out, using the lifting equipment. Afterwards we can drive the old bridge out of the track bed on the SPMT. Subsequently, we suspend the new bridge in the side girder bridge and bring it into the track bed via one of the other bridges. As soon as it reaches the right height, we maneuver it sideways under the catenary wires with the aid of electronic multidirectional steering and insert it into the resulting gap," explains Langer. Riga Mainz repeats this procedure until all eight bridges have been replaced.