Almost full

Ever wondered what 90,000 pounds looks like?

Today’s CSC testing focused on load and stacking tests. The load trials consisted of spot and balanced loading to stress the folding floor. Initially 45,000 pounds of balanced load was placed upon the floor followed by a second balanced load of 90,000 pounds on the container floor. After determining that this very well used box was still intact – stacking tests were initiated on the front end of the vertical folding container.

CSC Staxxon day 2 half load
While the container did not experience any failures during load testing, we will be making some design modifications to further reduce floor deflection under load. The commercial standard is that the floor under load should not deflect more than 1/4″ below the corner blocks. In a few instances, where there were no Staxxon vertical folding container horizontal support beams, the container floor was deflecting slightly beyond the target range.

With the container fully loaded with 90,000 pounds of balanced loading, the vertical stacking test applies pressure on the corner posts to determine deflection rating for a container. This test held special interest for the Staxxon team for two reasons: a previously mentioned, this is a 10+ year old container that has seen some “non-standard equipment” use including damage to the corner posts; and, since the Staxxon design adds steel reinforcement to the container, we wanted to determine if the new steel components would allow the original stacking height rating to be achieved.

Nearly one half million pounds stacking force

Today’s test applied a total of nearly 500,000 pounds of pressure to the corner posts at the front end (front panel end) of the container. Gauges measured flexing and deflection at each corner posts.

Dial meters front right load bearing post

The next test tomorrow will measure vertical stacking behavior at the back end (back doors) of the container. The container was left fully loaded (90,000 pounds) over night.

We’re not going to declare a positive or negative outcome to the vertical stacking test until the back end testing is done tomorrow. We will say that today’s vertical stacking results were much better than we expected. The back end of the container has a slightly different sill and header design than the front.

Tomorrow’s test activities will also include additional racking tests on the header and sill components.

We’ll also make a decision tomorrow about whether to “test to failure” or stop short of failure. We see each Staxxon prototype as a teaching and learning opportunity. Destructive testing is part of the education at certain stages.

We learned today that the yellow box probably spent the last part of its commercial life working in the Caribbean making transits to and from Barbados. Any readers who have experience with that service geography are welcome to offer speculation in comments about how the container corner posts and side rails were damaged.