Lashing systems with tensioning devices
Lashing safety for road vehicles
On account of the strict requirements in road safety procedures, the proper lashing of the loads has achieved an essential importance.
The different forces (longitudinal, trasverse and vertical) involved in the transport generate the effects on the load requiring the same to be secured by means of lashing elements to the chassis of the vehicle. As a consequence the vehicle has to be equipped with proper clamping elements.
The conclusion of the studies regarding the forces involved on the lashing items during transport are resumed by European Standard Specifications EN 12195 - Load restraint assemblies on road vehicles:
• Part 2 - Web lashing made from man-made fibres
• Part 1 - Calculation of lashing forces.
The EN Specifications describe the different ways of lashing and explain the formulas in order to calculate the forces involved.
Please find here below an example (always see as complete reference the Specification EN 12195 Part 1 and Part 2).
G load mass: 10.190 Kgs (equal to 10.000 daN weight)
Here below the maximum acceleration force in different conditions:
• During the braking: 0,8 x 10.000 daN = 8.000 daN
• During the acceleration: 0,5 x 10.000 daN = 5.000 daN
• In curve: 0,5 x 10.000 daN = 5.000 daN
The EN Specifications define that the admissible tension force of the web lashing has to be declared maximum the 50% of the working load limit.
The minimum breaking load of the web lashing capacity must be two times of the tension force.
With reference to the admissible tension force of the web lashing, it is important to make sure the way it is used: straight lashing or loop lashing. In the loop lashing the force is two times higher.
Note: See the European Standard Specification EN 12195 - Part 1 and 2 for any kind of information and lashing force calculation.