Throughout Germany, numerous steel and composite steel bridges (of 50 to 5000 tons) have been designed, manufactured, assembled and brought to their final location by us. Building and maintaining connections from and over streets, railway tracks, waterways and supply lines is part of our day-to-day business.

In addition to repair and remediation works on historical and partly also on listed buildings, our services have also been used for reinforcement of recent steel constructions or for constructing welding seams in especially sensitive areas, and have been highly valued by our clients.

With our qualified personnel, we guarantee high quality, particularly in projects involving scheduled check intervals and production stops. It all begins in the technical office, where workshop and assembly plans are developed by our structural engineers, constructors and designers, and at our structural steel assemblies, where our employees - from fitter and welder through supervisor to the assembly manager and engineer are at work. Their extensive knowledge and years of experience, coupled with a wide inventory of in-house assembly equipment, enables us to find the perfect solution for your requirements. It goes without saying that, for us, the manufacturing of steel components in our own workshops at Nordhausen is as important as the inclusion of other production partners in Germany and abroad, whereby quality assurance is always paid particular attention. We consider ourselves as a quality-oriented, innovative and reliable partner for your structural steel engineering projects.

Structural steel components are pre-fabricated in our in-house workshops and are furnished with the necessary corrosion protection, whereby particularly heavy-duty steel plates are processed.

Thermal cutting
- up to 24.0 m x 5.0 m x 0.25 m (lxbxh)

Machining
- with modern CNC boring and milling machines
- up to 14.0 m x 2.0 m x 1.7 m (xyz)

Production
- up to 130 t unit weight
- dimensions up to 90 m x 7.60 m x 8.50 m (lxbxh)

Corrosion protection
- Surface preparation through derusting by blasting
- Surface coating by airless method, hot-spraying method, high-pressure method
Airmix and Aircombi

On the basis of the assembly plans developed in our technical office, we carry out our on-site installations with our own qualified specialist staff, whereby the processes are coordinated and monitored by experienced assembly managers and welding engineers. The necessary supporting and stiffening constructions are prepared in our own assembly yard, are adapted to particular application and, when required, are also produced according to the project.

The development of the steel and composite steel bridge construction in our company was accompanied by the demand to bring these steel constructions ourselves to their designated final locations. While, in the early days, we primarily relied on rolling and shifting track systems, nowadays, modern shifting stations or self-propelled transport modules are preferably used. In addition to modern welding equipment, we also have, in our own assembly yard, an extensive equipment inventory for our assembly processes such as:

• ifting and shifting unit (HVE), 600 t compressive force
• patented shifting module up to v6000 KN
• Launching nose with hydraulic lifting table
• Gantry crane system up to 50 t
• Hydraulic presses / stacking systems up to 5 MN
• Hydraulic drive systems
• Support tower systems up to 6 MN
• Slideways and rollways

We ensure the success of our assembly procedures with sound planning, our own assembly equipment and our own qualified personnel.

A professional and high-quality restoration of welding seams places high demands on a welding operation. High levels of satisfaction of our clients confirm that we more than lived up to these demands. The necessary documentation and welding inspections are also carried out in-house.

In order to improve the durability of the weld seams made by us, our company took part in the research project REFRESH, whose objective was to extend the lifespan of the already existing and newly welded steel constructions. The fatigue strength of the welds increased by 80 to 100% in the result by using the high-frequency peening method HIFIT (High Frequency Impact Treatment), which prompted us to continually apply this method further. It is thus possible to prolong the lifespan of the entire construction by reworking highly stressed weld details. Already completed projects in the fields of steel bridge construction, crane tracks and mechanical engineering show that the range of applications is diverse and that they can also help remedy the known problems, usually in combination with a classical weld seam repair.

• Design, manufacturing and assembly of auxiliary constructions (from 1 t)
• Leasing assembly auxiliary constructions
• Lift and shift processes
• Provision of qualified professionals

We are regularly involved in research projects in structural steel engineering, where the emphasis is on the practical implementation and deployment of our technical skills. Furthermore, in our technical office, innovative assembly technologies as well as the necessary assembly auxiliary constructions are developed, designed, and finally manufactured in our own workshops. In 2011, another in-house development, the lift-and-shift mechanism (HVE) was added to our patented shifting modules, which are characterized by their compact design. This development was prompted by the necessity to erect the central arch of the Schnettker Bridge in Dortmund, which we managed to accomplish in a very limited space without disrupting traffic. Thus, we now have a modern, compact piece of equipment, which can horizontally shift loads of up to 20,000 tonnes, or can be universally used to lift and erect heavy-duty steel components.