Why not learn more about Trenching?

How to Use Trench Boxes Safely Trenches are quite common in many engineering and construction sites. They’re used for laying telephone lines, pipes as well as many other constructions. While some are quite deep, others may be extremely shallow. Depending on the quality of soil, trench walls won’t support themselves for a long time. An aluminum or steel trench box secures the trench walls to make it safe to work there without the risk of walls collapsing on people or equipment. Trench boxes are also called manhole boxes, tap boxes, sewer boxes, or trench shields. Pre-installation Before excavation starts, the location must go through a comprehensive risk assessment to identify any potential risks, the equipment needed as well as the employees needed. The need for additional access is also looked at.
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Then the trench will have to be looked at. How deep should it be? How large should it be? Trenches that over 5 ft need support from one of these: trench box, sloping, or shopping. But if it’s more than 20 feet deep, a registered engineer is required to design the trench’s support. How is the trench going to be accessed? It is by steps, ladders or a ramp? The trench should always have safe access for workers within 25 feet , in case of emergency. The atmosphere of the trench may also require testing for low levels of oxygen or poisonous gases. Trench boxes are made to be simple to install but it’s unsafe to stack boxes over each other.
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Looking after the trench Check for any signs of movement or damage by inspecting the trench box/trench support daily. All workers on the location must wear protective gear, high visibility clothing, hard hats, steel-toed boots, etc. Ensure that all heavy tools as well as equipment are kept far from the trench’s edge. Excavation It is probably more difficult to extract a trench box than install it because of the earth’s movement around the trench. It’s best to extract using a chain sling, through any of these 3 ways. Straight pull–this simply involves attaching a sling to two lifting/extraction points and lifting it out. Half pull–this involves attaching a sling to the side of a manhole box, lifting it as high as possible, switching the sling to the other side and repeating the action until the manhole box is removed. Single pull–this involves attaching a single chain sling leg to an extraction/lifting point and raising the panel corners in turns; once the manhole box moves easily, it’s taken out with the straight pull. To summarize, trenches save lives. It’s a legal requirement to use them and they need to be planned for. As long as they’re properly maintained and used, they make work a lot safer and easier.