Direct lashing.
There are two basic load securing methods: tie-down lashing and direct lashing. While in tie-down lashing the load is pressed onto the loading surface, in direct lashing it is held in position by tensioning straps. In contrast to tie-down lashing, direct lashing is a form-fit load securing method.
Direct lashing can be divided into different types:
- Direct lashing
- Diagonal lashing
- Bay/head lashing
For direct lashing, the required permissible lashing force of the lashing equipment depends on the following parameters:
- Lashing angle α (should be in the range between 20° and 65°)
- Horizontal angle β (should be in the range between 6° and 55°)
- Coefficient of sliding friction μ
- Load weight m
Another decisive factor is whether the load must be secured lengthways (x-direction) or crossways (y-direction) to the direction of travel, as different acceleration coefficients must be taken into account.
Additional measures such as positive locking, wedging, nailing or securing the load increase safety to a high degree.
Four lashing-straps are always used for diagonal lashing. There are three possibilities:
1. The lashing-straps are tensioned from the corners of the load to the nearest corner at the front and rear.
2. The lashing-straps cross over at the front and rear.
3. The lashing-straps cross over each other on the long sides.
The diagonal lashing.
In diagonal lashing, eight lashing belts are normally tensioned at right angles (β = 90°) to the loading surface. As standard, diagonal lashing is used either only in the longitudinal or only in the transverse direction, as the tight fit (e.g. due to blocking or other load units) secures the other direction.
The Dolezych-Einfach-Methode© for diagonal lashing.
Diagonal lashing
Calculation formulas for a free-standing, stable load unit with four lashing devices in accordance with VDI 2700 Sheet 2.
| Abbreviation | Definition / Explanation according to VDI 2700 | ||
| FiH | Restraining force in the lashing equipment | ||
| fl | Longitudinal acceleration coefficient = 0,8 | ||
| fq | Transverse acceleration coefficient = 0,5 | ||
| fv | Vertical acceleration value downwards = 1,0 | ||
| LC | Lashing Capacity of a lashing device | ||
| g |
| ||
| m | Mass of the load; mass of the laod to be secured | ||
| n | Number of lashing devices | ||
| α |
| ||
| βl |
| ||
| βq |
| ||
| μ |
|
Dolezych-Einfach-Methode©
for diagonal lashing
Your advantage: Simply and quickly select the required LC of the lashing equipment!
For the angle ranges
- α from 20° to 65° and
- β from 6° to 55°
the most unfavorable angle pairing was always used to calculate the securing force LC. The LC values in the table are rounded up so that they correspond to the respective LC of the available lashing equipment. Rounding up means you are “simple” and “safe”.
Prerequisite for the Dolezych Simple Method© direct lashing according to VDI 2700
- Center of gravity position
- Lashing equipment must have the same elongation
- The lashing equipment must be tensioned evenly (usually 10% of the LC)
- With four lashing devices with two lashing devices per side (n = 2)
- The attachment points on the load and loading area must have the appropriate strength
- Acceleration due to gravity g = 9.81 m/s2
Important: The coefficients of friction according to VDI 2700 Sheet 2, for example for Euro pallets (wood) on plywood (screen structure), can be found on our page about load securing. Friction coefficients can be increased with anti-slip mats.
