Evaluation of guardrails transitions (NF 058)

The process for achieving the NF marking of current section connections is based on Technical Annex No. 8 to the Certification Guide.Their NF certification is mandatory in France in accordance withthe order of 28 August 2014 modifying the order of 2 March 2009, known at the RNER(both documents can be downloaded at the bottom of the page).

This technical annex covers all systems of connections between two standard sections of defined restraint systems, including:

  • movable barriers measuring 40 metres or less in length,
  • simple junctions between two systems not consisting of a specific connector part.

The standard sections associated with the above products can have the CE mark or have formed the subject of authorisation for use in France

INITIAL ASSESSEMENT OF SYSTEMS

3 classes of assessment have been defined based on the types of system concerned: A, B and C.

CLASS A:

The systems are considered compatible. No particular assessment of the connection is carried out. There is simply an assembly test to be conducted in the initial audit.

CLASS B:

The successful conclusion of the tests defined in standard ENV 1317-4 is assessed by digital simulation.

The connection and the vehicle must be modelled in accordance with TR 16303. For connected barriers, correlation in the meaning of EN 1317-5 is not required. However, simulations allowing the behaviour and performance of the barriers in reference test conditions need to be supplied (in particular in order to validate failure modes).

In order to assess the variation in performance depending on the impact point selected, a parametric study is to be carried out for the two crash tests. The experiment plan (number and location of impact points) must first be submitted to ASCQUER [French road equipment certification body] for validation.

CLASS C:

Success in testing with a heavy vehicle as defined by ENV 1317-4 is assessed by a practical test in accordance with standards ENV 1317-1, ENV 1317-2 and ENV 1317-4.

Success in testing with a light vehicle is then assessed by digital simulation from a correlated digital model in the meaning of EN 1317-5 with the practical test carried out previously. The connection and the vehicle must be modelled in accordance with TR16303.

In order to assess the variation in performance depending on the impact point selected, a parametric study is to be carried out for the two crash tests (light test and heavy test). The experiment plan (number and location of impact points) must first be submitted to ASCQUER [French road equipment certification body] for validation.

Raccordement - Courtesy by ROUSSEAU SAS

 
The table below shows the various criteria assessed and the corresponding classes:

Family of products (1)

Restraint level

ΔD

Specific connector part (2)

Assessment classes

Identical

Identical

≤ 50 cm

No

No particular assessment

A

> 50 cm

No

Digital simulations

B

Identical

Different

(except level L)

X

Yes / No

Digital simulations

B

Different

Identical

≤ 50cm

No

No particular assessment

A

≤ 50cm

No

Digital simulations

B

> 50cm

No

Digital simulations

B

> 50cm

Yes

1 crash test in acc. with ENV 1317-4 on the heavy vehicle

+ Digital simulations for the light vehicle / parametric studies

C

Different

Different

X

Yes / No

1 crash test in acc. with ENV 1317-4 on the heavy vehicle

+ Digital simulations for the light vehicle / parametric studies

C

(1) The concept of family in accordance with para. 4.7 of EN 1317-2 for the following criteria: “ The grouping of barriers into families is only relevant in the following three cases:

  1. For barriers with one or more longitudinal elements with an identical cross-section, with a different spacing of supports or intermediate fixings in the ground;
  2. For barriers placed as wanted, differing only by their unit length;
  3. For barriers with additional height and additional parts, where the parts in contact with the vehicle during test TB 11 do not change.

The family of barriers comprises barriers which:

  1. are assembled from the same components, other than the additional parts;
  2. have the same mechanism of operation for the system and for the components."

ΔD:Absolute difference between the dynamic deflection of the two connected devices

(2) Specific connector part: particular part not belonging to either of the two systems, and intended to ensure the physical and mechanical continuity of the connection.

To request information or pricing, please contact us at contact@transpolis.fr

Created 31 Oct 2014 by NOUHAUD Alix . Last update 03 Aug 2016

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