Episode 35: Book lashing or sling lashing - application and possible uses
Load securing methods are more varied than you might think.
However, the tie-down lashing method is usually used, even though it is not very efficient.
Bay lashing or strapping lashing (EN-12195-1) is a securing method that can be used simply, safely and efficiently for certain loads.
It is important to know that the securing force only works in one direction at a time.
About the author:
In a series of specialist articles from the field, on topics relating to containers and trucks, you will receive first-hand professional knowledge.
How to secure cargo correctly and what are the basics of cargo securing?
They are developed and presented by Sigurd Ehringer, owner of SE-LogCon:
- VDI certified instructor for load securing
- Reference book author
- 8 years Project Manager
- 12 years with the Bundeswehr (company commander)
- 20 years of sales experience
- since 1996 consultant/trainer in logistics
- 44 years instructor/trainer in various fields
Episode 35: Book lashing or sling lashing - application and possible uses
Suitable loads are machines, systems, equipment, etc. where the securing devices can be passed through attachment points, eyelets, openings, recesses, etc.
Care must be taken to ensure that no sharp edges can impede the distribution of clamping force or damage the securing material.
When securing long loads such as masts, prefabricated concrete parts, pipes (also bundled) etc., they can be secured as follows.
Coming from one side of the loading area, the securing equipment (blue) is looped around the load or suitable positions on the load and returned to the same side.
The belt guide (orange) is used in the same way on the opposite side.
The load is held in position after the securing devices have been tightened by hand.
The lashing angle α between the two ends on each side must be taken into account.
To take dynamic situations into account for friction, a factor of 0.75 must be used for ƒμ.
This means that the friction force is reduced by the factor and the required securing force is therefore higher.
Two lashings must always be attached at right angles to the direction of travel, one on the left and one on the right, to prevent the load from twisting.
It is advantageous if a securing device is attached to two different lashing points on the cargo bed, as this allows the LC to be used twice.
The graphic on the right is an excerpt from EN 12195-1 with the calculation example.
A variant of this lashing method is similar to direct lashing, but the connection to the load (10,000 kg) is made using belt loops.
The straps are each attached to two different points on the loading surface, doubling the LC.
This method is simple, quick to install and provides a high securing force.
Calculated roughly, a belt provides a securing force of 4,000daN. This means 8,000daN in the direction of travel. This does not take friction into account.
It almost compensates for the reduction in securing force due to the lashing angle.
When attaching the straps to the perforated strip, the spacing specifications of the body manufacturer must be observed if necessary.
In the example on the right: max. 8,000daN per meter of perforated strip.
The situation in the loading example above would therefore be correct.
In the fictitious example, the calculated securing force, taking into account the lashing angles α and β, must be 2,445daN per lashing.
In the example, 4,000daN is calculated per strap, i.e. almost 1,500daN more than required.
If the load were placed on anti-slip mats, which is always sensible, and a coefficient of friction of μ=0.6 were taken into account, the safety cushion would be even greater.
The situations described above show that, with thought and practical knowledge, load securing can be made simple and safe.
Unfortunately, practical knowledge in both the shipper and driver sectors is not yet as developed as would be desirable.
One of the things I would like to do with my contributions is to encourage people to pay more attention to this issue in the interests of general road safety and to promote internal solutions.
Your Sigurd Ehringer.
Good load securing is so much more than just classic lashing. With just a little more effort, the shipper can create much more efficient and safer restraint systems. Just give it a try 😉
On our own account:
Rothschenk. That's us.
Rothschenk is a manufacturer of load securing equipment for overseas containers. In the tranquil town of Aub in central Franconia, we develop, test and sell our own load securing equipment such as dunnage bags/padding, Lashing restraint systems, Edge Protectors, Anti-slip Mats, Lashing Straps and drum securement. You can get a small insight into our product world in our Online Shop: [R] SHOP24.
We develop for our customers, to whom also large corporations e.g. from the CHEMICALS-, BEVERAGES- and Automotive industry belong, individual load securing. Therefore we are used to come up with new products and solutions in our own research and test department.
We stand for quality "Made in Germany„. Not only in development, but also in production. Because we are the only manufacturer for load securing with our own production site in Germany. Real "Made in Germany" even.
>> Please use the comment function below for suggestions, additions and also for further questions.
We will, of course, respond promptly and professionally. Your Rothschenk Team
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