The IHT Ingenieur- Hoch- und Tiefbau GmbH / Arge Ersatzneubau EÜ Mainzer Straße in Darmstadt commissioned Riga Mainz to replace several aging Deutsche Bahn railway bridges. SPMT axle lines from SCHEUERLE along with a very special lifting system allowed the crane company and heavy-load haulier to carry out the assignments very cost-effectively and quickly.

Riga Mainz was required to realise this very special task for the first bridge during the course of only one weekend, thereby replacing a railway bridge in need of refurbishment with a new, 320-ton concrete structure, and without removing the overhead lines. The bridge is one of eight that run parallel to each other and cross the Mainzer Strasse in Darmstadt. The crane and heavy-load haulier from Mainz had been tasked to gradually replace all of them. There was, however, just one catch: while the first bridge is located close to the road, every other bridge is positioned six metres deeper in the direction of the track bed.

“We could lift the first bridges while parked on the road to their designated positions using a mobile crane. But we couldn´t reach the remaining structures in this way at all. At the very least, the use of a crane with a corresponding reach would be very complex and expensive. That is why we were looking for a more economical solution,” explained Uwe Langer, Managing Director of Riga Mainz.

SPMTs provide Riga Mainz with a very efficient working method
The Mainz-based company had one year to develop an economical solution for the complex combination of transport, demolition, and assembly. An important part of this assignment was the SPMT (Self Propelled Modular Transporter) from SCHEUERLE. A side girder deck between the two electronically connected transport platforms served to accommodate the new concrete bridge. Altogether, 20 SPMT axle lines were required to carry the total load of 570 tonnes. On the side girder deck, Riga Mainz installed a certain process technology that it had developed itself and which, according to the company, is unique in Germany and provides a lifting capacity of 500 tons. Another advantage of the lifting system, for which a patent application has been filed, is the relatively low overall height. As a result, the transport including the cargo could pass safely under the overhead lines. This saved the client a lot of time and considerable cost.

SPMTs from SCHEUERLE help Riga Mainz carry out exceptionally efficient bridge replacement

Team performance: For the Darmstadt assignment, 20 SPMT axle lines from SCHEUERLE together with a special lifting system from Riga Mainz were used. The side girder deck between the two transport platforms was rented by Riga Mainz from Kübler.
With the help of the SPMT modules, Riga Mainz positioned the new concrete bridge into the gap whilst keeping below the overhead lines. Photo: Riga Manz

Multi-directional steering facilitated lateral bridge installation
The Riga Mainz approach was as well thought-out as the transport modules and lifting technology. “We drive the two SPMT platform vehicles on the road under the old bridge, separate it from the anchorage and then push it out using the lifting system. Subsequently, we could move the old structure from the track bed onto the SPMT. Following this, we suspended the new bridge in the side girder deck and swung it over one of the other bridges onto the track bed. As soon as it reached the correct height, we carefully manoeuvred it sideways under the overhead lines into the resulting gap with the help of the electronic multi-directional steering and brought it into position there,” explained Langer. Riga Mainz repeated this procedure until all of the eight bridges had been replaced.

Riga Mainz plans purchase of additional SPMT axle lines
"We couldn't have completed the assignment without SCHEUERLE's self-propelled transport modules," reported the CEO. "The SPMT is the best tool available for this! As a result, we will be purchasing additional SPMT axle lines from SCHEUERLE." The company had acquired its first SPMT axle lines back in 2001 and has continuously added to its fleet since then. Riga Mainz mainly uses SPMTs in order to move columns in refineries and the chemical industry.

SPMTs from SCHEUERLE help Riga Mainz carry out exceptionally efficient bridge replacement

Riga Mainz: Lifting & transporting specialist
Headquartered in Mainz with branches in Frankfurt and Ludwigshafen, Riga Mainz is one of the largest crane companies in the Rhine-Main region and specialises in lifting and transporting large and heavy loads. In addition, it carries out industrial plant erection, machine relocation and clean room assembly. The company also has a lot of experience in the areas of power plant construction, wind energy, tunnel construction and has had numerous assignments in complex industrial installations. Since a project planning department develops a tailor-made, economical and reliably implementable solution for every crane or transport task, so, where appropriate, Riga Mainz also develops its own transport and lifting equipment. This includes a spreader beam system that facilitates enormous flexibility when attaching loads.

SPMTs from SCHEUERLE help Riga Mainz carry out exceptionally efficient bridge replacement

TII Group: Solution provider for complex transport tasks
The TII Group is a manufacturer of heavy-duty and special vehicles. It is comprised of the Scheuerle, Nicolas, Kamag and TIIger brands, and provides innovative vehicles for logistics yards, public roads and industrial areas. Its heavy-duty vehicles with hydraulic pendulum axles support its customers from transport and logistics, building industry, plant engineering, air and space travel, and shipbuilding to energy, steel and mining – for realising a wide range of complex transport tasks. Transport assignments include construction machinery, wind turbine facilities, ships, antennas as well as entire factory plant. In addition to locations in Germany, France and India, the group has a global sales and service organisation.
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