do not work in excavations where there are signs of

accumulating water, which may weaken the side walls

Struts adjusted manually Worker must be in the trench for adjustment No uniform preloading Weight creates handling difficulties

trench shields or boxes must

extend 18 inches above the top of excavation walls, protect against collapsing soil, but they do not prevent cave ins

Sloping & Benching – Type B Soil

Type B soils – Most common soil encountered In a simple slope, 45-degree angle of repose Rise and run of each bench will be equal

Sloping – Type C soils

Poorest quality, but Sloping is still possible Angle of repose is very low (34 degrees) Safety Tip: In type C soil, for every foot down, the slope must extend 1.5 feet from the toe.

Protective Systems Sloping – Type A

Strongest and most cohesive, most sloping and benching options; Simple slope of ¾ to 1: every 1 foot down, soil must be excavated ¾ of a foot out from the toe slope of an excavation is measured from toe of slope to top edge. toe where slope meets bottom

1. Identify your workspace. 2. Look for hazards. 3. Use a checklist to identify hazards. 4. Discuss problems and corrections with supervisor.

With general work practices at excavations best practices are

Regular inspections of site, soils by competent person. No working alone.

a cut in the earth that is deeper and longer than it is wide, but not wider than 15 feet

any man-made cut, cavity, trench, or depression in an earth surface, formed by earth removal

What are the Major Types of excavation Hazards in Construction?

A. Unprotected edges B. Fall hazards C. Improper sloping or benching D. Spoils mismanagement E. Not properly classifying soils F. Improper shoring systems

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intro to industrial

safety

Question	Answer
when dusts, fumes, mists, vapors or gases are produced, they must be handled to prevent a hazardous situation in the trench . - Heavy gasses displace oxygen	false
Employees shall not work in a trench where water is standing or accumulating, unless there is a system to remove the water, or the employee uses a safety harness and lifeline.	false
Structural ramps at excavations much be designed by a competent person and constructed in accordance with the design.	false
The spoils of an excavation must be kept at least two feet from the edge of the excavation.	false
The competent person has authority to evacuate an excavation site if it is exposing employees to unsafe conditions such as a possible cave-in or hazardous air	true
do not work in excavations where there are signs of	accumulating water, which may weaken the side walls
excavations deeper than 20 feet require	an engineered design
screw jack systems	Struts adjusted manually Worker must be in the trench for adjustment No uniform preloading Weight creates handling difficulties
trench shields or boxes must	extend 18 inches above the top of excavation walls, protect against collapsing soil, but they do not prevent cave ins
Sloping & Benching – Type B Soil	Type B soils – Most common soil encountered In a simple slope, 45-degree angle of repose Rise and run of each bench will be equal
Sloping – Type C soils	Poorest quality, but Sloping is still possible Angle of repose is very low (34 degrees) Safety Tip: In type C soil, for every foot down, the slope must extend 1.5 feet from the toe.
Protective Systems Sloping – Type A	Strongest and most cohesive, most sloping and benching options; Simple slope of ¾ to 1: every 1 foot down, soil must be excavated ¾ of a foot out from the toe slope of an excavation is measured from toe of slope to top edge. toe where slope meets bottom
trench cave ins =	greatest risk
worksite analysis	1. Identify your workspace. 2. Look for hazards. 3. Use a checklist to identify hazards. 4. Discuss problems and corrections with supervisor.
spoil should be	2 foot setback from edge
With general work practices at excavations best practices are	Regular inspections of site, soils by competent person. No working alone.
trench	a cut in the earth that is deeper and longer than it is wide, but not wider than 15 feet
excavation	any man-made cut, cavity, trench, or depression in an earth surface, formed by earth removal
What are the Major Types of excavation Hazards in Construction?	A. Unprotected edges B. Fall hazards C. Improper sloping or benching D. Spoils mismanagement E. Not properly classifying soils F. Improper shoring systems

Created by: paigewurdeman

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