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Shipping container under-structure damage

Some clients are not really aware of how serious/dangerous damaged condition are for the container under-structure, maybe just because of the underside structure is seldom to be exposed to have an inspection. In fact, underside structural members are easily damaged by various lifting operation. These photos show the damaged cross-members and tyne-side, which are resulted from the tough improper forklift operation. This type damage is hard to see, and does weaken the flooring strength integrity. If no repair occurs at the first place, it would cause much more expensive repair cost soon.

Shipping container under-structure damage


Shipping container under-structure damage _3


Shipping container under-structure damage _4


Shipping container under-structure damage _2


This box got an in-service inspection somewhere five months ago, and had a CSC updated.

It is believed that the corner casting bottom aperture has been worn-out then, apparently the client ignored such worn-out damage to put it for use continuously. From stage 1 photo, just half percentage thickness remains after worn-out. Then, it could cause stress cracking due to remaining wall thickness collapsed as shown in stage 2 photo. Finally, whole material would be gone (stage 3) and an impact-like breakage/breach happens. It is extremely dangerous condition during the transportation.



corner casting stage 1 worn out


corner casting stage 2 cracking


corner casting stage 3 breach corner casting stage 3 broken


Mezzanine Deck Failure in Side Opening Container or Taughtlier

There are some typical cases in relation with mezzanine deck failure in side opening container or taught-liner:

–          Cracking to welding joint to container frame – stress concentration

–          Cracking to longitudinal beam/member of mezzanine deck understructure – stress concentration

–          Cracking/torn at the top surface of mezzanine deck – heavy loading with tough operation

–          Mezzanine deck supporting shoes/retainer failure partially or completely – impact damage

–          Safety slide locking pins failure due to vibration moving during road/rail transport

Mezzanine Deck transverse member vertical cracking Mezzanine Deck Support Shoe broken 1 Mezzanine Deck Shoe plug missing Mezzanine Deck Shoe plug missing Mezzanine Deck falling failure 2 locking bar not in position Mezzanine Deck falling failure 1 Mezzanine Deck connection cracking 2


Stages of Structural Cracking

Photos are taken in a 48ft  container, it is clear to see that, when the structural cracking just happens it always starts from hairline cracking at the top or bottom joint of crossmember/side rail, at this stage, many clients will say put them as NO ACTION TAKEN, then the cracking would extending throughout the entire web section (see stage 3 photos), finally completely separated each other.

In this typical case, the damage is definitely NOT resulted from external impact force, a structural stress concentration is a main cause.

Stage 1

Shipping Container structural cracking

Stage 3

Shipping Container structural cracking

Stage 2

Shipping Container structural cracking

Stage 4

Shipping Container structural cracking

Cross Member Bent

Cross member bent laterally more than 50mm with top flange completely connection with floor has been totally lost.

CSC Compliance

Side Panel Hole

Hole in side panel caused by impact.

CSC Compliance

Floor broken with x-member damaged

Typical floor broken with x-member damaged due to heavy loading or rough fork truck operations. It could have no remarkable damaged appearance on top floor view, but it is a serious CSC issue.

CSC Compliance

Corner Post Bent Inward

Corner post dented inward and ISO framework dimension cannot be kept.

CSC Compliance

Corner Post Bent

Corner post dent in and distorted more than IICL 25mm criteria.

CSC Compliance

Corner casting cracking

Corner casting cracking.

CSC Compliance

Corner casting broken

Serious consequence after corner casting worn out if no repair.

CSC Compliance

Corner casting bent up

Corner casting bottom aperture bent up to impair the twist lock cone securing, which is a serious safety issue.

CSC compliance