Transcription of TRENCHING & SHORING GUIDELINES - TAMUC
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TRENCHING & SHORING GUIDELINES - TAMUC
TRENCHING & SHORING GUIDELINES DEPARTMENT OF RISK MANAGEMENT AND SAFETY CREATED JUNE 2009 Table of Contents Introduction .. 1 Requirements .. 1 Excavations .. 2 SHORING Types .. 2 Hydraulic SHORING .. 2 Pneumatic SHORING .. 2 Screw Jacks .. 2 Single-Cylinder Hydraulic Shores .. 3 Underpinning .. 3 Shielding Types .. 3 Trench Boxes .. 3 Combined Use .. 3 slope and Shield Configurations.. 4 Sloping and Benching .. 4 Sloping .. 4 slope Configurations .. 5 5 Determination of soil Type .. 6 Stable Rock .. 6 Type A Soils .. 6 Type B Soils .. 6 Type C Soils .. 6 soil Testing Methods .. 7 Visual Test .. 7 Manual Tests .. 7 soil Mechanics .. 8 Safety and Health Considerations .. 9 Competent Person .. 9 Surface Crossing of Trenches .. 9 Ingress and Egress .. 9 Exposure to Vehicles .. 10 Exposure to Falling Loads .. 10 Warning Systems for Mobile Equipment .. 10 Hazardous Atmospheres and Confined Spaces.
compressive strength or cementation requirements of Type A soils but are fissured or subject to vibration; dry unstable rock; and layered systems sloping into the trench at a slope less than 4H:1V (only if the material would be classified as a Type B soil). Type C Soils
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