Post-tensioning of Structures

In 1932 Eugene Freyssinet developed the first theory of post-tensioned concrete. The development of this technology has made it possible to advance in structures of greater length, greater slenderness and with a better optimisation of resources.

The use of the technique of post-tensioning steel in concrete began in the first half of the 20th century, and has evolved along with the most modern construction technologies, providing designers with tools that allow them to build the most complex structures, such as those currently being built all over the world.

As a result of the effort and the search for the achievement of its objective of specialisation and structural technification. The ORION Group has signed a collaboration agreement with the firm MK4, founded in 1971, which enables it to install the MK4 system. The MK4 system has the CE marking and the ETA (European Technical Assessment) technical suitability document, as required by current regulations.

Post-tensioning of Structures in Civil Works

The use of the post-tensioning system in civil works began 50 years ago, and its development has allowed the construction of lighter structures with longer spans, with a more rational use of the materials employed.

The ORION Group, through the MK4 patent, offers these services as a company specialised in the execution of post-tensioned steel, installing from the classic passive and active anchors and couplers, to the most modern ones with anti-corrosion electrical protection or retestable in bridges and viaducts of the most diverse complexity, with highly qualified trained personnel and the most modern and efficient machinery on the market.

Post-tensioning in Buildings

In addition to its use in civil works, this type of system solves the architectural problem of the large open spaces that are currently being planned. It solves the required stresses generated by the large spans with the minimum thickness of the slabs.

The MK4 system allows the tensioning of slabs or floor slabs of buildings through the placement of the typical single-strand anchorage up to the anchorage with five strands thanks to the use of oval sheaths.

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