1865 Formation of the company Lang & Cie, Karlsruhe, Germany
1869 Gottlieb Widmann (left) & Eugen Dyckerhoff (right)
Change of name to Dyckerhoff & Widmann AG
1882 Water Reservoir, Wiesbaden, Germany
Rammed concrete, capacity: 4.300m3 (5,600 cu. Yds.)
1904 Railway Bridges near Kempten, Germany
Rammed concrete, longest span: 64,5m (212ft.)
1913 Dipl. Ing. Franz Dischinger
joins Dyckerhoff & Widmann AG
1923 Dipl. Ing. Ulrich Finsterwalder
joins Dyckerhoff & Widmann AG
1925-1927 Construction of planetaria
Zeiss-DYWIDAG system, in Mannheim, Nuremberg, Dresden, and Berlin, Germany
1927 Construction of Saale bridge Alsleben
Special feature: prestressed iron tie by Dipl. Ing. Franz Dischinger, a predecessor of today’s prestressing technique
Longstreth Medal in Philadelphia, USA for the world’s greatest technical achievement
Thanks to the growing worldwide recognition of DYWIDAG systems and construction projects
DYWIDAG begins licensee business.
1953 First prestressed concrete bridge over the Rhine river:
Nibelungen Bridge, maximum span: 114m, Worms, Germany
Several post-tensioned prestressed concrete bridges are built in Austria, Sweden, Denmark, Finland, Norway and the Netherlands
Sumitomo obtains a license for manufacturing and distributing DYWIDAG's Post-Tensioning System and for applying DYWIDAG's Free Cantilever Construction Method in Japan and the Far East
1964 Bendorf Bridge
A new world record in prestressed concrete, Germany, Length: 524,70m
DYWIDAG's Post-Tensioning System is exclusively used for DYWIDAG's own projects or partner projects
The decision is made to market the DYWIDAG Post-Tensioning System outside the group. The License Department is founded within DYWIDAG
Systematic development of additional DYWIDAG systems such as bar, ground and rock anchors using 16mm Ø threabars and stay cable systems.
DYWIDAG subsidiaries are founded in Austria, USA, Canada and Italy.
Creation of an international network of companies for the global distribution of DYWIDAG systems and know-how
Second Main Bridge (135 + 135m spans), Frankfurt, Germany. First significant application of DYWIDAG rock anchors with double corrosion protection in Waldeck II cavern near Kassel, Germany. First tests are carried out on GEWI® Piles for subsequent distribution. Development of the DYWIDAG Strand Post-Tensioning System
1970 Water tower Riyadh, Saudi Arabia
Main reservoir: 12.000m3; hydraulic lifting by 44m into the final position
First Canadian Application of Segmental Form Traveler Construction in Vancouver, Canada
1972 BMW office building in Munich, Germany
100m high cylinders that are suspended on a support tower with a useable surface of 72.000m2. Construction of the stories on the ground and subsequent lifting into their final position using the DYWIDAG Bar Post-Tensioning System
First US Application of Segmental Form Traveler Construction in San Diego, California, USA
Intensified activities as a general contractor in turnkey construction, structural design, industrial construction, and underground projects as well as production of precast segments.
1975 Construction of the CN Tower, Toronto, Canada
550m high television tower, platform with restaurant, upper tower shaft made of prestressed DYWIDAG concrete
DYWIDAG establishes the DSI Company Group as an independent organization in order to take over the work of the Licensee Department and continue the successful worldwide marketing of DYWIDAG systems and technical know-how
DSI companies founded in the Netherlands, South Africa, UK, Korea, Taiwan, Thailand, Venezuela and France. DSI agencies founded in Turkey, Iran, Saudi Arabia, United Arab Emirates, Qatar and Oman
1988 Olympic Bridge, Seoul, Korea
Development, production, supply and installation of DYWIDAG Stay Cable Systems
DSI committed to total quality;
DIN EN ISO 9001 since 1994
New DSI companies in Portugal and Indonesia. New DSI representatives in Lebanon, Czech Republic, Latin America, Croatia, Bosnia, Herzegovina and Malaysia
1997 <i>GEWI</i>® Piles secure Berlin's largest underground project against uplift - Lehrter Bahnhof, Germany
6,500 GEWI® Piles, 63.5mm Ø, were driven 17.5m to 26.4m deep into the ground from floating platforms to counteract hydraulic uplift
1997 Offshore oil platform Hibernia, Newfoundland, Canada
Production, supply and installation of 7,000t DYWIDAG Strand Tendons for the oil platform, height 111m
Plus Austrian and French affiliates into a single DSI GmbH with European branches
More than 50 subsidiaries, licensees and agents
2000 DSI tunneling products secure various tunnels for ICE high speed railway, Germany
DSI acquires ANI Strata Products and establishes a new business in the underground mining industry as well as in Australia
2002 Stay Cable Bridge over the Paraná River, Argentina
Production, supply and installation of 128 DYNA® Grip Stay Cables with a total weight of 740t
DSI opens new facility for mining products in Salt Lake City / USA and in Johannesburg / South Africa
Integration of SUSPA GmbH activities into the German business of the DSI Group. Merger creates SUSPA-DSI GmbH
DSI's global network consists of more than 75 subsidiaries, licensees and agents
2004 "Snøhvit" project, Melkøya, Norway
"Snøhvit" is the "northernmost industrial plant in the world". DSI supplies 1,650t of cryogenic DYWIDAG Multistrand Tendons for the construction of four LNG (Liquefied Natural Gas) Tanks
DSI strengthens its mining business by acquiring Celtite Pty Ltd (Celtite), Australia
2005 Golden Gate Bridge, CA, USA
Retrofit using DYWIDAG Geotechnical & Post Tensioning systems. Supply, installation, stressing and grouting of DYWIDAG Post-Tensioning Tendons.
DSI acquires Underground companies in North America
DSI acquires Stewart Mining in Canada. This acquisition establishes DSI as the market leader for mining products in Canada
The European private equity firm Industry Kapital acquires DSI
DSI acquires Artéon SA in France. This step strengthens DSI's market position in France and its market leadership for geotechnical and form tie systems in Europe
DSI acquires the leading supplier of mining products Mexicana de Anclas Mineras in Zapopan, Jalisco, Mexico
DSI acquires Galaxy SA with its subsidiaries Technique Béton SAS and Mandelli-Sétra SAS. The Galaxy Group is a leading manufacturer and distributor of formwork accessories, special mortars, lifting and fastening tools in construction industry.
2006 DYWIDAG Multistrand Anchors tie down Gilboa Dam, NY, USA
For strenghtening Gilboa Dam, DSI produces and supplies 83 DYWIDAG Multistrand Anchors in lengths of 50-70m. The stressing operation is carried out using a 15,000kN stressing jack that was specially developed by DSI
2006 Woodrow Wilson Bridge, Washington D.C., USA
The bridge consists of two parallel, 1,850m long bridges in each direction. Each bridge accommodates 6 lanes of traffic plus shoulders. DSI supplies the post-tensioning material and related equipment in compliance with the strict quality requirements for three independent contracts
DSI strengthens its tunneling division by acquiring ALWAG Tunnelausbau Ges.m.b.H. in Pasching, Austria
DSI further strengthens its tunneling and mining activities in North America by acquiring the shares of American Commercial Incorporated (ACI), Bristol, VA, USA
DSI USA acquires Fasloc, Inc., a premier producer of Resin Cartridges for mining and tunneling in the USA
DSI expands its mining activities in South America by acquiring Soprofint SA, headquartered in Santiago, Chile
DSI acquires 100% of the shares of the German contec Bausysteme GmbH.
Headquartered in Porta Westfalica, Germany, contec is a leading specialist supplier of formwork and sealing systems on the domestic market
2007 Customized Products for Wastewater Treatment Plant, Marseille, France
Technique Béton, a 100% subsidiary of DSI, produces and supplies its special repair mortar Ravalchoc, mould release agents and other Concrete Accessories to one of the largest sewage plants in France
DSI acquires all outstanding shares of the Italian company DYWIT SPA, Milan, Italy
DSI is sold by Industri Kapital to CVC Capital Partners. CVC Capital Partners is a leading international private equity company with a total of 11.6 billion Euros in equity capital
September 2007
DSI acquires Idéaplast in France. Idéaplast produces accessories for the construction, aviation and automotive industries
The acquisition of MET-TECH Industries Ltd., USA extends DSI's market leadership in the supply of mining products in North America
2008 DSI supplies special products for Australia's longest road tunnel in Brisbane, Australia
For the construction of the 5,000m long double tunnel, DSI supplies the AT-76 injection system used for the first time in Australia in addition to many other products and systems. The injection system protects the TBM in advance from water damage and ensuing failure
December 2008
DSI acquires Fosminas Ancoragens Ltda., a leading producer of mining products in Brazil
DYWIDAG-Systems International (DSI) acquires business from AGRHIMERC S.A.C., Peru and establishes DSI Peru S.A.C.
Extension of DSI's market presence in South America by acquisitions
December 2009
DSI acquires the remainder of the shares of DYWIDAG Sistemas Constructivos (DSC) in Spain. DSC is now a wholly-owned subsidiary of the DSI Group
DSI acquires the remaining 38% of shares of PROTENDIDOS DYWIDAG Ltda., Brazil
Significant investments in EMEA's production capabilities in Austria for Geotechnics, Tunneling & Mining
The acquisition of DYWIDAG-Systems International (DSI) by Triton is closed on June, 15th, 2011. Triton, a highly respected European private equity house, is now the owner of DSI
2011 DSI South Africa strengthens Export Activities in Botswana and Zimbabwe
DSI is one of the largest and leading producers of products and systems for mining in South Africa. DSI plans to strategically expand its export activities into the important neighboring countries such as Botswana and Zimbabwe. Clients include BHB Billiton, Xstrata, Exxaro, De Beers, Anglo American Thermal Coal, Anglo American Platinum, Bombela Construction, Sasol, CMI Joint Venture and a large number of small and medium sized mining operations
February 2012 DSI acquires a majority stake in UK specialist mining contractor Drill Tek Injection Systems Ltd.
Drill Tek is a mining services contractor offering both contracting services such as roof bolt installation and resin injection as well as product supply for roof support and reinforcement in underground mines. Additionally, the UK based company provides specialist services for tunneling and civil infrastructure construction. The acquisition represents a strategic investment for the future of DSI’s business and is the first acquisition undertaken since Triton Partners acquired DSI in June 2011.
March 2012 The Harbor Drive Pedestrian Bridge, San Diego, CA, USA
DSI supplied DYWIDAG-Post-Tensioning Systems for one of the world’s longest Self-Anchored Pedestrian Suspension Bridges
This project won the Engineering News Record (ENR) “Best of the Best” award.
The JFP 95 Blue Anti-Static Dust Suppressant marks DSI’s continuing expansion into chemical products for the Underground industry. DSI plans to use the existing distribution network that was established by WB Mining along with its own global sales network to market and sell the JFP product line worldwide.
April 2013
DSI enters Russian Mining market: Foundation of the new entity “DSI Techno” in Kemerovo, Kuzbass region.
Strategic investment in line with DSI’s growth strategy for the Mining segment
DSI opens a new International Purchasing Office in Shanghai, China.
The new office coordinates the co-operation with DSI’s Far East suppliers and all internal procurement divisions
May 2013
DSI receives five awards of the Post-Tensioning Institute (PTI) in Arizona, USA
Five major projects that DSI significantly contributed to receive 3 “Awards of Merit“, 1 “Project of the Year Award“ and 1 „Award of Excellence“ 
February 2014
DSI acquires Schaum-Chemie Mikołów Sp. z o.o. The company acts as DSI Schaum Chemie on the market.
  • Acquisition of 100% of JENNMAR Canada strengthens DSI’s mining capabilities in Canada
  • Acquisition of 49% in J-LOK® Resins allows DSI to have own manufacturing of resin capsules in Australia
  • Establishment of a bolt and resin joint venture with JENNMAR in South Africa
November 2014 DYWIDAG-Systems International (DSI) acquires Post-Tensioning business in Brazil
  • Acquisition of 100% of shares of Prepron Group
  • Establishment of a strong presence in the Brazilian Post-Tensioning market
December 2014 PT DSI Underground Indonesia opens new Manufacturing Facility for Mining Products in Indonesia
The new, 3,000m2 manufacturing facility in Gresik, Surabaya, East Java primarily produces friction bolts for mining. 
Foundation of the Joint Venture DSI-Bridgecon in India consisting between the partners DSI and Bridgecon India Private Ltd. focusing in the business areas of Stay Cable Technology, Post-Tensioning and Geotechnics.
August 2015
Acquisition of the Intellectual Property and manufacturing assets for the “OneStep“ mining bolt from Hilti AG. OneStep is a self-drilling mining bolt which combines the drill head, drill steel, bolt and adhesive resin in a single unit.
August 2015
The newly established DSI Company DYWIDAG-Systems International Saudi Arabia, LLC in Riyadh-Olaya becomes fully operational. The new company strengthens DSI’s presence in Saudi Arabia and the Middle East.
September 2015
Formation of the Wind Tower Technologies strategic business unit. The new business unit focuses on the future development and sales strategies for the wind tower business in Europe.
Acquisition of the Jennmar Mining businesses outside the US, sale of the US Mining business to Jennmar. The acquisition allows DSI’s customers to profit from the most comprehensive portfolio in ground support products.
February 2016
Acquisition of shares of license partner QACS and establishment of DSI Middle East W.L.L.
Strategic partnership and strengthening of DSI’s market position in Qatar and the Middle East Region.
February 2016
Reorganization of the DSI Group. Effective March 2016, DSI Construction and DSI Underground operate as two separate divisions. DSI Construction continues to trade under “DYWIDAG Systems International” with the traditional company logo. DSI Underground adopts a new logo that goes into effect immediately.
July 2016
DSI Underground and Northern Mining Products (NMP) Sweden, sign an exclusive agreement to manufacture and sell the Dynamic OMEGA-BOLT®. The innovative rock bolt is based on the well-known expandable OMEGA-BOLT® friction bolt and is equipped with an internal additional steel element having a “C” profile that can absorb a significant amount of elastic energy.
Establishment of the new company DSI Underground Mongolia LLC in Ulaanbaatar, Mongolia.
Change of name of the US American DSI Underground unit located in Louisville, KY, USA to DSI Tunneling LLC. All sales activities in Tunneling North America are concentrated at this location.
Establishment of DSI Underground Nordic AB in Skellefteå, Sweden. The new logistics center can efficiently supply some of the largest underground metal mines in Europe with high quality ground support products on short notice.
December 2017
Acquisition of Heintzmann Australia Pty Ltd in Australia. The acquisition enables DSI Underground to enter the standing support market including steel props or roadway repair.
March 2018
DSI Underground acquires Mining World S.A. in Buenos Aires, Argentina. The company operates as DSI Underground S.A., offering high quality and innovative solutions that make the underground industry safer and more efficient.
April 2018
DSI Underground Australia and Fero Group Pty Ltd sign an agreement under which DSI Underground Australia acquires 100 per cent of Fero. The acquisition completes DSI Underground’s product offer in galvanizing and mesh manufacturing. The completion of the acquisition is conditional on approval from the Australian anti-trust authority, the ACCC.
May 2018
Inauguration of the global Center of Competence for chemical products and of a new production facility for injection chemicals in Mikolow, Poland.
December 2018

DSI Underground opened the new Production Facility for Resin Capsules in Mikołów, Poland in order to be able to meet every demand, including urgent and highvolume orders.

January 2019

Independent market presence of DSI Underground after completion of the separation from DYWIDAG-Systems International in January 2019.

February 2019

Opening of a new manufacturing plant in Buenos Aires, Argentina. The plant has more than 2,000 square meters and generates new jobs in consolidating local production and support the customers in short term with high-quality products.

April 2019

In April 2019 the production of galvanized mesh for the mining industry in Gresik Surabaya was successfully started. This is an important milestone in the expansion of local production in Indonesia.

October 2019

In October 2019 DSI Underground acquired Mansour Mining Technologies Inc. The acquisition complements DSI Underground's product portfolio in Canada and also strengthens the customer service network and R&D resources.

December 2019

First delivery and installation of Injection Chemicals in Mexico (Tunnel Toluca de Valle de Mexico). The DSI Underground team supported the customer with supervision and installation know-how.

September 2020

Foundation of the joint venture DSI Underground Ventilation in Chile consisting of the partners DSI Underground and ABC Ventilation Canada. The new company produces and supplies complete ventilation systems for mining and tunneling in Latin America.

DSI Underground Australia

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