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External tendons

For external post-tensioning, the tendons lie outside the cross-section of the concrete member, but inside the envelope of the structure. These post-tensioning systems are used for prestressing concrete members made of normal weight concrete. They are largely designed in accordance with DIN EN 1992-1-1:2011-01 in conjunction with DIN EN 1992-1-1/NA:2013.

Regulatory framework

DIBt grants national technical approvals (abZ) for post-tensioning systems and their components.

European Technical Assessments (ETAs) can also be issued for post-tensioning kits.

Please note that there are no conclusive technical rules for the design and execution of structural works using prestressing systems – except for pre-tensioning at the factory in accordance with DIN EN 1992‑1‑1:2011‑01, Clause 5.10. In cases which are relevant from a regulatory point of view, a construction technique permit (aBG) is generally required. DIBt grants general construction technique permits for prestressing applications.

Note: The lists below may still include approvals for a construction technique, also called 'application approvals'. As a result of the revision of the Model Building Code (MBO) in 2016 followed by the revision of the applicable Building Codes of the federal states (LBO), these are successively being replaced by construction technique permits or will expire.

National procedure

To prepare an abZ/aBG for your construction product, we need an application from you. We recommend that you contact us prior to doing so. Feel free to send us your enquiry informally via email to dibt(at)dibt(.)de or to the competent technical contact listed in the top right.

For a first assessment, please send us the following information:

  • Description of the construction product and its intended field of use
    • e.g. material, configuration, number of sizes, variants, dimensions
    • e.g. use in walls, ceilings, interior construction, building services
  • Description of the construction technique and its field of application
    • e.g. design of walls, ceilings, elements, etc., and interaction of components
    • e.g. application in foundation engineering, reinforced concrete construction, building insulation; as load-bearing or non-load-bearing component; under static and quasi-static loading; fire exposure; other environmental exposures
  • Information regarding impact on regulatory concerns
    • in particular structural integrity, fire protection, health and environment protection, sound insulation as well as thermal performance
  • Explanation of need for an abZ/aBG
  • Contact details
    • preferably email address and/or telephone number, as well as name, organisation/company, and postal address

We will then contact you to clarify the next steps.

If you already hold a DIBt approval and/or construction technique permit and wish to apply for an amendment, supplement, or renewal, please use the form provided below.

European Technical Assessment (ETA)

To start the ETA procedure, please submit the form below. We will then check if the prerequisites for issuing an ETA are met, i.e., in particular, if the product is not fully covered by an existing harmonised standard. If the prerequisites are met, we will check whether a European Assessment Document (EAD) covering the requested assessment scope already exists or still needs to be developed. If an EAD needs to be developed or amended, a complete technical file needs to be established before the procedure can begin.

abZ+aBG

Z
new decision
E
supplement
Ä
amendment
V
renewal
G
valid until
Subject concerned Applicant Decision no. Validity
from / to
Litzenspannverfahren zur externen Vorspannung von Tragwerken mittels Vorspannsystem VT-CMM KD BBR VT International Ltd Bahnstraße 23 8603 SCHWERZENBACH/ZURICH SCHWEIZ Z-13.3-110 Z: 15.01.2026
G: 01.01.2031
BBV Externes Litzenspannverfahren Typ EW für Türme von Windenergieanlagen BBV Systems GmbH Industriestraße 98 67240 Bobenheim-Roxheim Z-13.3-133 Z: 11.01.2024
G: 21.12.2028
Litzenspannverfahren zur externen Vorspannung von Tragwerken mittels Vorspannsystem SUSPA-Monolitze DYWIDAG-Systems International GmbH Neuhofweg 5 85716 Unterschleissheim Z-13.3-135 Z: 17.04.2025
G: 03.03.2030
SUSPA-Draht EX für Windenergieanlagen DYWIDAG-Systems International GmbH Neuhofweg 5 85716 Unterschleissheim Z-13.3-141 Z: 16.04.2021
G: 25.03.2026
Litzenspannverfahren VT-CMM D/KD für Windenergieanlagen BBR VT International Ltd Ringstrasse 2 8603 SCHWERZENBACH/ZURICH SCHWEIZ Z-13.3-143 Z: 12.03.2024
G: 16.04.2029
Litzenspannverfahren zur externen Vorspannung von Spannbetontragwerken mittels Vorspannsystem BBV Typ LoE BBV Systems GmbH Industriestraße 98 67240 Bobenheim-Roxheim Z-13.3-157 Z: 29.07.2025
G: 04.07.2030
Litzenspannverfahren zur externen Vorspannung von Tragwerken mittels Vorspannsystem VT-CMM KD BBR VT International Ltd Ringstrasse 2 8603 SCHWERZENBACH/ZÜRICH SCHWEIZ Z-13.3-78 Z: 15.01.2026
G: 01.01.2031
Spannverfahren zu externen Vorspannung von Tragwerken mittels Vorspannsystem VBT 1 bis 16 extern nach ETA 10/0006 Gleitbau Ges. m.b. H. VBT-Systems Itzlinger Hauptstraße 105 5020 SALZBURG ÖSTERREICH Z-13.73-100006 Z: 16.09.2025
G: 04.09.2030
Spannverfahren zum externen Vorspannen von Tragwerken mittels Vorspannsystem 'BBV Typ E' nach ETA 11/0123 BBV Systems GmbH Industriestraße 98 67240 Bobenheim-Roxheim Z-13.73-110123 Z: 26.02.2025
G: 24.01.2030
Stabspannverfahren zum externen Vorspannen von Tragwerken mittels Vorspannsystem 'BBV 1030' nach ETA-16/0286 BBV Systems GmbH Industriestraße 98 67240 Bobenheim-Roxheim Z-13.73-160286 Z: 21.10.2025
G: 21.09.2029
Anwendungsregeln für das Spannverfahren SUSPA-Draht Ex nach ETA-20/0810 DYWIDAG-Systems International GmbH Neuhofweg 5 85716 Unterschleissheim Z-13.73-200810 Z: 08.04.2021
G: 25.03.2026
Stabspannverfahren ohne Verbund zum externen Vorspannen von Tragwerken mittels Vorspannsystem "Macalloy 1030" nach ETA-21/0054 BBV Systems GmbH Industriestraße 98 67240 Bobenheim-Roxheim Z-13.73-210054 Z: 24.10.2024
G: 15.09.2027
Anwendungsregeln für das Stabspannsystem zum Vorspannen von Tragwerken, extern nach ETA-05/0122 Stahlwerk Annahütte Max Aicher GmbH & Co. KG Max-Aicher-Allee 1-2 83404 Ainring-Hammerau Z-13.73-50122 Z: 15.11.2023
G: 15.11.2028
Anwendungsregeln für das Stabspannsystem nach ETA-05/0123 zum externen Vorspannen von Tragwerken DYWIDAG-Systems International GmbH Neuhofweg 5 85716 Unterschleißheim Z-13.73-50123 Z: 11.07.2023
G: 28.06.2028
Anwendungsregeln für das Spannverfahren SUSPA-Draht Ex nach ETA-07/0186 DYWIDAG-Systems International GmbH Neuhofweg 5 85716 Unterschleissheim Z-13.73-70186 Z: 25.03.2021
G: 25.03.2026