|Photo of the month – May 2006
Figure 1 [Achim Kock]
Nice cab, shame about the load
On its trailer, the truck is carrying a mobile container for flammable liquids, a hydraulic breaker and a pulverizer.
Figure 2 [Achim Kock]
The load securing measures taken (friction securing and tie-downs) are virtually without effect either horizontally or laterally. A close look at Figures 3 through 5 below gives rise to the following list of deficiencies:
Figure 3 [Achim Kock]
|Figure 3 clearly shows that the loading area is heavily contaminated with sand. For the combination of wood on loading area, a coefficient of friction of µ = 0.3 can normally be assumed. The sand on the surface would probably reduce this to µ = 0.15. This is compounded by the fact that the hazardous goods container is secured by just one tie-down; at least two should be used. The securing effect of the belt will not be more than 75 daN. It is only to be hoped that the container does not weigh more than 115 kg with or without contents.
Figure 4 [Achim Kock]
|Figure 4 shows the hydraulic breaker resting on wooden boards and tied down with two belts. One of the hooks of one of the tie-downs is attached to the chassis of the trailer, and only the tip of the hook engages the chassis. This means that the hook is no longer subjected to a tensile load, but to a bending load. The following calculation shows that the securing force of the tie-downs is not sufficient to secure the load.
Figure 5 [Achim Kock]
|The load weight of the pulverizer (Figure 5) was in all probability more than 2 metric tons and was secured in the same way as the hydraulic breaker. The load does not appear to be liable to tip, but calculations carried out in the same way as above quickly show that the load securing measures were wholly inadequate.
Figure 6 [Achim Kock]
|Increase the friction by cleaning the loading area and using friction-enhancing materials (nonslip mats).
|Securing of the load by means of a tight fit (direct securing), e.g. lashings to the sides, lashings or head loops to the front and back or direct securing using wooden bracing against the borders of the loading area or against stanchions. To achieve this, however, a suitable vehicle would have to be used.
Deficient load securing can be a potentially fatal hazard, as the articles for the months November 2002, November 2003 and November 2005 strikingly illustrate.
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