Trench safety is non-negotiable on any excavation site. Cave-ins are a serious hazard, making reliable protective systems a legal and practical requirement. Two of the most common methods used across Australian worksites are shoring and trench boxes (shielding).
While both systems aim to prevent injuries from trench collapses, they work in different ways and serve distinct purposes. In this guide, we explore trench boxes versus shoring, breaking down their key differences, functions, and the right situations to use each to maintain compliance and site safety.
Trench box vs shoring
Let’s understand the basic difference between trench boxes and shoring because, as they both protect from cave-in, they do it in different ways.
Shoring
Shoring is a preventive measure against cave-ins. Engineers design this support system to hold the trench walls in place and actively reinforce them to prevent collapses.
It stabilises the surrounding ground by applying pressure against the trench walls. For example, hydraulic shoring uses hydraulics to apply an outward pressure to the soil on the trench walls.
Learn more about shoring, its types and installation in our guide to what is shoring.
Shielding (Trench boxes)
As the name suggests, shielding is a protective mechanism against cave-ins. It doesn’t hold the trench walls back; rather, it protects the workers in case the trench collapses.
The most popular method for shielding is using trench or shoring boxes. It’s a sturdy steel or aluminium structure placed inside the trench where workers operate. It acts like a protective barrier, absorbing the pressure of falling soil, allowing the workers to safely operate.
Comparative chart of shoring vs shielding
| Trench box (shielding) | Shoring | |
| Purpose | Prevents trench walls from collapsing by supporting the soil. | Protects workers inside the trench in case a collapse occurs. |
| Protection type | Preventive | Protective |
| How it works | Applies pressure against trench walls to keep them stable. | Creates a safe enclosure for workers inside the trench. |
| Setup time | Takes longer to install and remove. | Faster to set up and relocate. |
| Mobility | Usually fixed in place until work is done. | It can be lifted and moved along the trench as work progresses. |
| Cost | Generally higher due to materials and labour. | More cost-effective for short-term or linear projects. |
When to use shoring vs shielding
Although shoring and shielding are both trench safety systems, they serve different purposes and are used under different site conditions.
Use shoring when:
Shoring is used in loose or unstable soil that can easily shift and cause cave-ins. If you are working in proximity to structures, roads and utilities where a cave-in can cause damage to the surroundings, shoring is a better option to ensure overall site protection. Similarly, in high-pressure surroundings, the cave-ins are likely to happen, hence shoring is the safer option.
Another application of shoring is irregularly shaped excavations where sturdy trench boxes don’t fit in. Shoring fits perfectly with any trench shape. Its flexibility allows it to adapt to varying widths, shapes, and curves, ensuring consistent protection throughout the trench.
Use shielding (trench boxes) when:
Crews install trench boxes when the soil is stable, the risk of cave-ins is low, and the excavation isn’t too deep. They can easily relocate these boxes within the trench as work progresses, making them a more mobile solution. It’s ideal for shallow excavations and small projects due to its cost-effectiveness.
Moreover, they are popular for repetitive excavation and everyday civil and construction projects due to their easy installation and relocation.
We have a separate article on installing trench boxes. Check it out to see the easy installation process of trench boxes.
Legend Hire’s shoring/trench boxes for hire
Legend Hire provides a wide range of trench boxes for hire across Australia. Our trench boxes are available in both steel and aluminium and are built to meet the demands of Australian worksites while keeping your crew protected.
Steel Trench Boxes: They are ideal for deeper and heavy-duty excavations. These shoring boxes provide high strength and stability in demanding ground conditions. They’re designed to handle higher loads and offer long-term durability, making them a trusted choice for large-scale projects.
Aluminium Trench Boxes: Our aluminium trench boxes are lightweight yet sturdy. They are perfect for smaller excavations or sites with frequent setup changes. Their lighter build makes them easier to transport and install without compromising worker safety.
Besides trench boxes, Legend Hire offers a full range of shoring and trench safety equipment for hire. We also provide shoring services where our engineers guide you on the right trench safety method and install it on your site, making it a no-brainer task for you. Reach out to get our expert advice on excavation safety.