The so-called licensee business of DYCKERHOFF & WIDMANN (DW) has a long tradition dating back to 1950. It was based on the sale of know-how developed by DW and was covered within DW by a separate department, the License Department.

Due to the promising growth of the license activities, DW decided in 1979 to establish DSI as an independent organization in order to take over the work of the License Department and to continue the successful worldwide marketing of the DYWIDAG systems and technical know-how.

Today the DSI Group of Companies is an internationally operating network of wholly-owned subsidiaries, associated companies and representatives held by Dyckerhoff & Widmann AG. DSI GmbH, Munich, is responsible for coordinating business within the Group.

DSI global activities report to 3 headquarters, located in Munich for Europe and the Middle East, Hong Kong for the Far East Region and Chicago-Bolingbrook for USA, Canada and Latin America.

Within the main fields of activity such as pre-stressing, geo-technics and reinforcement, DSI is distributing the following systems and techniques :

• DYWIDAG post-tensioning systems using bars or strands DYWIDAG stay cables for cable-stayed bridges DYWIDAG rock and soil anchors
• DYWIDAG bolts for mining
• DYWIDAG thread bar reinforcing systems
• DYWIDAG building techniques for bridges/tanks/towers/runways DYWIDAG heavy lifting techniques
• DYWIDAG structural maintenance & repair

In the meantime DSI has established itself as one of the leading companies specialized in construction systems and techniques for both reinforced and pre- stressed concrete structures and geo-technical projects.