Accident Investigation Summary |
Summary Nr: 963926 |
Event: 11/20/1991 | Employee Hospitalized When Mixer Overturns Into Excavation |
On November 20, 1991, Employee #1 backed a loaded concrete mixer truck, containing 9 yards of concrete weighing about 62,000 lb, into a 15 ft wide access area between the edge of a 7 ft deep excavation and its 10 to 15 ft high spoil pile. He was preparing to pour concrete into the formwork of a house foundation that was installed in the excavation. The soil was type D (granular-gravel-sand). The sides around the perimeter of the formwork were almost vertical and were not supported in any manner. Employee #1 positioned the mixer about 3 to 4 ft from the edge of the excavation to allow for the concrete chute to reach the formwork. Before he had a chance to dismount from the mixer, the ground under the mixer caved in, causing the mixer to fall into the excavation and overturn. Employee #1 was hospitalized. The employer did not provide specific instructions in hazard recognition regarding the working environment for off-highway work sites.
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Keywords:
excavation, concrete truck, work rules, concrete mixer, shoring, sloping, cave-in, untrained, overturn
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Inspection |
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Degree |
Nature |
Occupation |
1 |
104416599 |
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Hospitalized injury |
Bruise/Contus/Abras |
Motor transportation occuputions n.e.c. |