How Shipping Containers are Stacked on Cargo Ships - American Trailer Rentals (2024)

FAQs

How are shipping containers stacked on ships? ›

Placing the bottom container, known as the foundation, securely on the ground or ship's deck. Each subsequent container is then hoisted and positioned onto the top of the stack, using twist locks or other interlocking mechanisms to affix them firmly to the foundation.

Each corner of the chassis features a set of pin locks/twist locks that fit into slots on the corner fittings of the container. The container is then fastened to the chassis by manually pushing in or rotating the twist locks. The size of the container will determine the proper configuration of pin locks/twist locks.

You should always stack one corner post over the other for maximum stability. The corner posts of the container above and the corner posts below should perfectly align to maintain structural stability. If you are stacking shipping containers of different sizes, the larger unit should be on top.

To secure a container to a trailer, operators use twist locks or locking pins at each container corner. These locks fit into corresponding fittings on the trailer, stabilizing the container during transport. Regular checks and maintenance of these locks are essential for safety.

Containers are secured using twist locks and a series of lashing rods between the stack and bridges or hatch covers. Incorrect or inadequate securing can significantly reduce the stability of a container stack.

One of the most common ways to connect shipping containers and make sure that the seam between the two is well-connected is via plates and caulking.

The capacity of a chassis depends mainly on its axles. The axle is the lengthy shaft connecting the wheels. A regular chassis can haul 20-foot and 40-foot containers with only two axles.

The most common way to transport a modified shipping container – and the most recommended – is by using a tractor trailer. However, there are occasions in which mounting a container on a trailer with a chassis (a frame on wheels that carries the container) is the best solution.

Top Loader. A top loader is a type of forklift that is specifically designed to lift shipping containers from the top and stack them in a single pile.

Twist locks are mechanisms that secure the four corners of a shipping container to one another as they stack.

Can empty containers be stacked? ›

Empty containers can be stacked up to about 7 containers in height, although 6 is considered safer (empty stacks are vulnerable to strong winds).

Once containers are aboard a ship, they are lashed into place. This prevents them moving or sliding when in transit. There are also twist-locks to secure them in place, but 3 can be stacked without requiring these locks. With locks, up to 7 containers can be stacked safely on top of each other.

If you are hauling a static load, such as wood, boxes, or things like that, then you want to use cargo straps across the cargo itself. You then attach it to the sides of the trailer and tighten it down. A ratcheting strap is best to achieve the tension you will need.

How High Can You Stack Shipping Containers? While traveling at sea, it's possible to stack containers around nine units high. For modified structures, it all depends on the building. If you're hoping to create an on-site office space, stacking containers two or three units high is probably best for safety.