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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://civilconstructiontips.blogspot.com/2011/06/support-for-foundation-trenches.html
Jun 12, 2011 · The sides of trenches in clay soil do not usually require support for some depth, say up to 1.5 m, particularly in dry weather. In rainy weather, if the bottom of the trench in clay soil gets filled with water, the water may wash out the clay from the sides at the bottom of the trench …
https://www.vpgroundforce.com/gb/shoring-equipment/
Excavation Support. Groundforce Shorco's equipment portfolio includes a full range of Trenching Equipment and Shoring Equipment including: Trench Boxes, Trench Sheets and Piles, light and heavy duty hydraulic bracing, hydraulic struts and other related products.
http://courses.washington.edu/cm420/Lesson5.pdf
CM 420 – TEMPORARY STRUCTURES LESSON 5: EXCAVATIONS AND EXCAVATION SUPPORTS Page 4 of 14 Figure 1b - Use of plastic sheets for slope protection in a shallow excavation Shallow Trenches The primary function of any trench support method is to protect people from caving ground. The secondary function is to provide support to nearby structures and allow equipment access
https://www.designingbuildings.co.uk/wiki/Trench_support
A trench is defined as an excavation when its length greatly exceeds its depth. Shallow trenches are usually considered to be less than 6 m deep and deep trenches greater than 6 m. Depending on the dimensions of a trench, excavation can either be carried out by hand or using a mechanical digger.
https://www.pdhonline.com/courses/g111/g111.htm
6. Trench Support selection 7. Design of trench slopes 8. Course summary. This course includes a multiple choice quiz at the end. Learning Objective. The purpose of this course is to show the reader the importance of considering the various options of excavation and trench support methods.
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.designingbuildings.co.uk/wiki/Types_of_excavation
Trench, or footing, excavation is typically used to form strip foundations, buried services, and so on. The choice of technique and plant for excavating , supporting and backfilling the trench depends on factors such as; the purpose of the trench , the ground conditions , the trench location , the number of obstructions, and so on.
https://www.hse.gov.uk/construction/safetytopics/excavations.htm
the support system itself, eg using trench box extensions or trench sheets longer than the trench depth. Inspection A competent person who fully understands the dangers and necessary precautions should inspect the excavation at the start of each shift.
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