Why are hydraulic shores frequently used?

Why are hydraulic shores frequently used?

Reasons for the popularity of hydraulic shoring: It is more safe than timber shoring. The workers need not go into the trench to install or to remove hydraulic shoring. Hydraulic systems can be easily installed by a worker as they are light.

What is the maximum depth that you can use shoring?

Trenches 5 feet (1.5 meters) deep or greater require a protective system unless the excavation is made entirely in stable rock. If less than 5 feet deep, a competent person may determine that a protective system is not required.

Which type of soil Cannot be benched?

Type C soil cannot be benched.

What is the greatest danger associated with excavations?

• The greatest risk in an excavation is a cave-in.
• Employees can be protected through sloping, shielding, and shoring the excavation.
• A competent person is responsible to inspect the excavation.
• Other excavation hazards include water accumulation, oxygen deficiency, toxic fumes, falls, and mobile equipment.

What is OSHA Type C soil?

Type C soil is the least stable type of soil. Type C includes granular soils in which particles don’t stick together and cohesive soils with a low unconfined compressive strength; 0.5 tons per square foot or less. Examples of Type C soil include gravel, and sand.

What is the most expensive and difficult method of shoring?

The most expensive trench support methods are shoring methods such as soldier piles, sheet pile, or modular shoring. 3. Soil conditions: Open cut can be made in most soil conditions where ground water can be handled. If obstructions are common the trench production will be slowed for any support system.

Is shoring better than trenching?

Shoring is the most economical and safest method of protecting trench workers. Cave-ins are the biggest hazard faced by the trench workers. An unstable trench can collapse and kill or injure the workers at any time.

Is shoring always better than trenching?

Today, however, there is a better choice. The more modern method is known as trench shoring or shielding. Upon first glance, construction managers will often opt for sloping. Trenching, however, done properly can actually cost much less and is less time consuming.

What are the three main protection methods against cave-ins?

To prevent cave-ins:

• SLOPE or bench trench walls.
• SHORE trench walls with supports, or.
• SHIELD trench walls with trench boxes.

How can we protect excavation?

Loose materials – may fall from spoil heaps into the excavation. Edge protection should include toeboards or other means, such as projecting trench sheets or box sides to protect against falling materials. Head protection should be worn.

How can employers prevent cave-ins?

Such precautions can include special Page 17 Trenching and Excavation Safety 1 1 support or shield systems to prevent cave-ins, water removal to control the water level, or the use of a safety harness and lifeline.

What is cave in excavation?

A cave-in occurs when walls of an excavation collapse. Cave-ins can be deadly. Wall failures often occur suddenly, with little or no time for the worker to react.

What causes cave-ins?

When Cave-ins Occur A cave-in occurs anytime the strength of the soil is overcome by the weight of the soil. This causes the soil near the bottom of the trench to bulge inward as a result of the weight of the soil above it. When this happens the lip of the trench wall will move downward.

Are trenches considered confined space?

A trench isn’t considered a confined space except in these circumstances. A confined space has limited or restricted means of entry or exit and is not designed for continuous occupancy by a worker. Examples include tanks, underground vaults, manholes, tunnels, equipment housings, ductwork and pipelines.

When a trench is 4 feet or more in depth?

In the United States, any pit or trench with a depth equal to or greater than 4 feet is classified as a permit-required confined space. A permit-required confined space has to have one or more specific characteristics, the first being that it contains hazardous gases or has the potential to be a hazardous space.

How deep can you Excavation without shoring?

How Deep Can a Trench Be Without Shoring? Trenches with a depth of 5 feet (1.5 meters) or greater need a protective system unless the entire excavation is in stable rock. If there is anything less than 5 feet, it is up to a competent person’s discretion to determine if there is a need for a protective system.