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https://www.haspod.com/blog/construction/excavations-and-the-1-2-m-rule
The basis of the rule is that, if a trench is under 1.2m deep, then people can enter the trench without the sides of the excavation being supported or battered back. This rule is no longer something that should be considered. 1.2m is no longer the threshold for the need to support an excavation.
https://www.safetybydesigninc.com/osha-trenching-and-excavation-safety-tips-requirements/
Sep 18, 2018 · A trained employee or contracted professional(s) must assess and identify all soil types and any potential trench excavation safety hazards. They must then select the correct protective system appropriate for maximum safety during excavation. Trenching and Excavation …
https://www.osha.gov/Publications/trench_excavation_fs.html
Excavation and trenching are among the most hazardous construction operations. OSHA defines an excavation as any man-made cut, cavity, trench, or depression in the earth’s surface formed by earth removal. A trench is defined as a narrow underground excavation that is deeper than it is wide, and is no wider than 15 feet (4.5 meters).
https://www.ccohs.ca/oshanswers/hsprograms/trenching_excavation.html
Working in trenches and excavations is hazardous to both the workers who work inside them, and to workers on the surface. The hazards include: Cave-ins or collapses that can trap workers. Equipment or excavated soil falling on workers (e.g., equipment operated or soil/debris stored too close to the excavation).
https://ronmeyerexcavating.com/excavation-terminology/
Apr 15, 2017 · An Excavation is any man-made cut, cavity, trench, or depression in an earth surface that is formed by earth removal. A Trench is a narrow excavation (in relation to its length) made below the surface of the ground. In general, the depth of a trench is greater than its width, and the width (measured at the bottom) is not greater than 15 ft (4.6 m).
https://www.pdhonline.com/courses/g111/g111.htm
Speed shores is a system where support for nearly vertical trench walls is accomplished by using hydraulic rams which force beams and sheeting against the trench wall. This can be a very efficient support …
https://www.wikihow.com/Excavate-a-Trench
Dec 29, 2019 · Benching the excavation: If you are digging in loose soil, a deep vertical trench wall is at risk of collapse. Benching involves digging the trench in steps or tiers instead, so the banks do not have to support more material than they are capable of. These benches are usually at intervals 2.5–3 feet (0.76–0.91 m) deep and twice as wide.Views: 308K
http://courses.washington.edu/cm420/Lesson5.pdf
Prefabricated trench boxes are used to maintain trench integrity during excavation and backfilling operations. These can be quickly setup and placed in a section of trench. The trench box is slid along the trench with excavation occurring just ahead of the trench box and backfilling occurring in the back half of the trench box.
https://www.youtube.com/watch?v=O3bjzxULlG0
Dec 08, 2015 · Groundforce Trench Boxes comprise a simple, robust, two-sided mechanical excavation support system. Each trench box is designed as a temporary earth retaining structure allowing the sides of the ...Author: Vp Groundforce
https://www.hse.gov.uk/construction/safetytopics/excavations.htm
Structural stability during excavations What you need to do. The law says you must prevent danger to workers in or near excavations. To maintain the required precautions, a competent person must inspect excavation supports or battering at the start of the working shift and at other specified times. No work should take place until the excavation is safe.
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