Tell Me About Trench Box Excavation

Trench Box Excavation | Excavation Trench Box | Trench Bedding Box

A trench box excavation is common at many construction sites and is considered one of the most dangerous construction operations. Digging a hole in the ground seems simple but it is estimated that over 100 deaths per year occur due to the cave-ins and other excavation hazards. Digging can be a major cause of concern unless you know proper techniques and the rules for excavation and trenching. Never dig until you know it is safe.

OSHA regulation applies to all open excavations made in the earth service and requires workers in trenches and excavations be protected from the hazards that can occur during the operation. Prior to any excavation for trench work, the OSHA requirements should be reviewed and followed. Companies are responsible for knowing and following current federal, state and local laws, implementing and effective help and safety program and ensuring all affected employees work safely and follow the rules and regulations.

By definition, a Trench Box Excavation is considered an excavation but there are differences between the two types have opened, an excavation is any man-made cut, cavity, trench or depression in an earth surface formed by earth removal. A trench is described as a narrow excavation made below the ground that is deeper than it is wide, trenches can be up to 15 feet wide.

Here is break down of trench box excavation processes:

  • Pre-excavate approx. 1.5 m depending on the stability of the soil; the Box-element is lowered into the pre-excavated trench,
  • Excavation is continued. A maximum of 0.5 m is advised, depending on the stability of the soil.
  • Both sides of the box are pushed independently.
  • When both sides are lowered, excavation will continue.
  • Excavation is continued. A maximum of 0.5 m is advised, depending on the stability of the soil.
  • Both sides of the Box are pushed independently.
  • After reaching full depth, pipes can be laid.

The most feared of all the hazards is the possibility of a cave-in. all excavations are hazardous because they are inherently unstable. Workers can be seriously injured or killed if the sides of a trench collapse. Unsafe trenches are the major factor in many trenching hazards. Trenches don’t have to be deep for accidents do occur. Serious injuries are also possible in shallow trenches that are less than five feet deep. Cubic yards of dirt can weigh up to 2700 pounds and are capable of moving a 25 feet per second. A cave in makes very little noise and gives very little warning. Prior to the collapse, some causes of cave-ins include:

  • vibrations from equipment or traffic in the area

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