Unbonded tendons
For internal unbonded post-tensioning, the prestressing tendons are arranged in a duct filled with a special corrosion protection system. 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
- Do you significantly deviate from the Technical Building Rules?
- Or do neither Technical Building Rules nor generally recognised technical rules exist?
- 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.
- pdf-Datei Application for amendment / supplementation / renewal of a national technical approval and/or construction technique permit (4 pages ) Last updated: 10 April 2024; Application form
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.
- pdf-Datei Form for requesting a European Technical Assessment (ETA) (2 pages ) Last updated: 11 March 2025
| Subject concerned | Applicant | Decision no. |
Validity
from / to |
|---|---|---|---|
| SUSPA-Drahtspannverfahren intern ohne Verbund | DYWIDAG-Systems International GmbH Neuhofweg 5 85716 Unterschleissheim | Z-13.2-109 |
Z:
03.07.2024 G: 02.04.2029 |
| VBT-Monolitzenspannverfahren ohne Verbund nach DIN EN 1992-1-1 und DIN EN 1992-2 | VBT Vorspann- und Brückentechnologie GmbH Brookstraße 27 49497 Mettingen | Z-13.2-124 |
Z:
06.07.2022 G: 02.07.2027 |
| SUSPA-Monolitzenspannverfahren für Ringspannglieder nach DIN EN 1992-1-1 | DYWIDAG-Systems International GmbH Neuhofweg 5 85716 Unterschleißheim | Z-13.2-40 |
Z:
07.07.2022 G: 03.07.2027 |
| BBV Litzenspannverfahren Typ Lo ohne Verbund und Anwendungsbestimmungen | BBV Systems GmbH Industriestraße 98 67240 Bobenheim-Roxheim | Z-13.2-70 |
Z:
29.11.2023 G: 14.06.2027 |
| Litzenspannverfahren zur internen Vorspannung ohne Verbund von Tragwerken mittels Vorspannsystem SUSPA-Monolitze | DYWIDAG-Systems International GmbH Neuhofweg 5 85716 Unterschleissheim | Z-13.2-95 |
Z:
17.04.2025 G: 03.03.2030 |
| Litzenspannverfahren zum internen Vorspannen von Tragwerken mittels Vorspannsystem VBT-BI ohne Verbund nach ETA-10/0308 | Gleitbau Ges. m.b. H. VBT-Systems Itzlinger Hauptstraße 105 5020 SALZBURG ÖSTERREICH | Z-13.72-100308 |
Z:
14.06.2024 G: 22.12.2028 |
| Spannverfahren zur internen, verbundlosen Vorspannung von Tragwerken mittels Vorspannsystem 'BBV Typ L1 P' nach ETA-13/0810 | BBV Systems GmbH Industriestraße 98 67240 Bobenheim-Roxheim | Z-13.72-130810 |
Z:
26.02.2025 G: 08.02.2030 |
| Monolitzen-Spannverfahren ohne Verbund zum internen Vorspannen von Tragwerken mittels des Vorspannsystems DYWIDAG-Einzelmonolitzenverankerung nach ETA-13/0814 | DYWIDAG-Systems International GmbH Neuhofweg 5 85716 Unterschleissheim | Z-13.72-130814 |
Z:
04.10.2024 G: 18.07.2029 |
| Stabspannverfahren zum internen, verbundlosen Vorspannen von Tragwerken mittels Vorspannsystem 'BBV 1030' nach ETA-16/0286 | BBV Systems GmbH Industriestraße 98 67240 Bobenheim-Roxheim | Z-13.72-160286 |
Z:
21.02.2025 G: 21.09.2029 |
| Litzenspannverfahren ohne Verbund zur internen Vorspannung von Onshore-Spannbetontürmen mittels AF-Verankerung des Vorspannsystems VSL AF nach ETA 18/0531 | VSL (Schweiz) AG Wankdorfallee 5 3014 BERN SCHWEIZ | Z-13.72-180531 |
Z:
21.01.2025 G: 01.01.2030 |
| Monolitzenspannverfahren ohne Verbund zum internen Vorspannen von Tragwerken mittels des Vorspannsystems DSI L1-L7 mit Gussankern nach ETA-19/0077 | DYWIDAG-Systems International GmbH Neuhofweg 5 85716 Unterschleissheim | Z-13.72-190077 |
Z:
14.01.2025 G: 10.12.2029 |
| Stabspannverfahren intern ohne Verbund zum Vorspannen von Tragwerken mittels Vorspannsystem "Macalloy 1030" nach ETA-21/0054 | BBV Systems GmbH Industriestraße 98 67240 Bobenheim-Roxheim | Z-13.72-210054 |
Z:
11.11.2024 G: 21.12.2027 |
| Anwendungsregeln für das SUSPA/DSI Monolitzenspannverfahren ohne Verbund mit 1 bis 5 Monolitzen nach ETA-03/0036 | DYWIDAG-Systems International GmbH Neuhofweg 5 85716 Unterschleissheim | Z-13.72-30036 |
Z:
19.06.2023 G: 16.06.2028 |
| Anwendungsregeln für das Stabspannsystem zum Vorspannen von Tragwerken, intern ohne Verbund nach ETA-05/0122 | STAHLWERK ANNAHÜTTE Max-Aicher GmbH & Co. KG Max-Aicher-Allee 1+2 83404 Ainring - Hammerau | Z-13.72-50122 |
Z:
15.11.2023 G: 15.11.2028 |
| Anwendungsregeln für das Stabspannsystem nach ETA-05/0123 zum internen Vorspannen von Tragwerken ohne Verbund | DYWIDAG-Systems International GmbH Neuhofweg 5 85716 Unterschleißheim | Z-13.72-50123 |
Z:
11.07.2023 G: 28.06.2028 |
| Litzenspannverfahren zur internen verbundlosen Vorspannung von Onshore-Spannbetontürmen mittels Vorspannsystem VSL Post-Tensioning System nach ETA 06/0006 | VSL (Schweiz) AG Wankdorfallee 5 3014 BERN SCHWEIZ | Z-13.72-600061 |
Z:
22.07.2025 G: 22.07.2030 |
| Anwendungsregeln für das BBR VT CONA CMM - Spannverfahren ohne Verbund mit 01, 02 und 04 Litzen nach ETA-06/0165 vom 22.07.2016 | BBR VT International Ltd Ringstrasse 2 8603 SCHWERZENBACH/ZURICH SCHWEIZ | Z-13.72-60165 |
Z:
17.12.2021 G: 21.10.2026 |