- What is the safest way to get into and out of a deep excavation?
- How close can you excavate next to a tree?
- What type of soil Cannot be benched?
- How can the hazard of open excavations be eliminated?
- At what depth must an excavation be supported?
- What is considered a deep excavation?
- What needs to be done before you start to excavate?
- What are the three methods of excavation?
- Why is shoring needed?
- At what depth is trench support required?
- When should Trench Shoring be used?
- How do you protect deep excavation?
- What are 3 main protection methods against cave-ins?
- What are some dangers of excavations?
- Why do trenches collapse?
- Why excavation can cause landslide?
- What are the types of shoring?
- How long does it take to excavate a trench?
- What is benching in excavation?
- What is the difference between shoring and shielding?
What is the safest way to get into and out of a deep excavation?
Prevent people and materials falling in – with barriers strong enough not to collapse if someone falls against them.
Keep plant and materials away from the edge.
Avoid underground services – use relevant service drawings, service locating devices and safe digging practice.
Provide ladder access to get in and out..
How close can you excavate next to a tree?
A 7-foot diameter tree such as yours has roots that should not be disturbed closer than 84 to 126 feet from the trunk of the tree. (7 feet diameter X 12 inches/foot X 1.0 or 1.5 = 84 or 126 feet) This means that you should stay at least 84 feet to 126 feet from the trunk when excavating.
What type of soil Cannot be benched?
Examples include granular soils such as gravel, sand and loamy sand; submerged soil or soil from which water is freely seeping; and submerged rock that is not stable. Benching Type C soil is unacceptable and shall not be done.
How can the hazard of open excavations be eliminated?
Examples of reducing risk during excavation work Isolation—for example use concrete barriers to separate pedestrians and powered mobile plant to reduce the risk of collision. Engineering controls—for example benching, battering or shoring the sides of the excavation to reduce the risk of the ground collapsing.
At what depth must an excavation be supported?
The 1.2m rule for trenches used to be in older health and safety regulations and is often still quoted today. The basis of the rule is that, if a trench is under 1.2m deep, then people can enter the trench without the sides of the excavation being supported or battered back.
What is considered a deep excavation?
Shallow excavations are defined as being anything less than 1.5 metres deep, which really is not very deep at all; a relatively short person could comfortably see over the top. Deep excavations, on the other hand, are defined as being any excavation which is more than 4.5 metres in depth – a considerable height indeed.
What needs to be done before you start to excavate?
What you should do before you begin an excavation?Identify the soil type(s) related to the excavation or trench you are going to dig. … Look for the legislative requirements that apply in your jurisdiction and the type of protective measures to be taken.Locate all buried services.More items…•Dec 21, 2016
What are the three methods of excavation?
Types of excavation3.1 Cut and fill excavation.3.2 Trench excavation.3.3 Basement excavation.3.4 Road excavation.3.5 Bridge excavation.3.6 Dredging.3.7 Over excavation.Oct 5, 2020
Why is shoring needed?
Shoring, form of prop or support, usually temporary, that is used during the repair or original construction of buildings and in excavations. … Temporary support may be required, for example, to relieve the load on a masonry wall while it is repaired or reinforced.
At what depth is trench support required?
1.5 m deep3.6 Securing the work area. a trench at least 1.5 m deep, must ensure, so far as is reasonably practicable, that the work area is secured from unauthorised access (including inadvertent entry).
When should Trench Shoring be used?
6.2 Shoring. Shoring is a positive ground support system that can be used when the location or depth of an excavation makes battering and/or benching impracticable. It should always be designed for the specific workplace conditions by a competent person (for example an engineer).
How do you protect deep excavation?
Those methods are sloping, benching, and shoring or shielding. Sloping: Sloping is a viable option as a protective system. Sloping is often the most cost-effective way to protect employees from potential trenching and excavation hazards.
What are 3 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.
What are some dangers of excavations?
Top 5 excavation safety hazardsCave-ins. Trench collapses kill an average of two workers every month, making this a serious threat to worker safety. … Falls and falling loads. Workers and work equipment can fall into an excavated area. … Hazardous atmospheres. … Mobile equipment. … Hitting utility lines.Feb 12, 2018
Why do trenches collapse?
A trench collapse happens for a number of reasons. Sometimes, the fact that the soil around the trench is dry or is of a material that just does not naturally hold together well can lead to an unexpected collapse. Wet weather and the vibrations from nearby construction equipment can also cause a collapse.
Why excavation can cause landslide?
If the landslide is divided into the sliding and the anti-sliding sections, the more the anti-sliding section of the sliding body is excavated, the more the anti-sliding force will be reduced, resulting in a more unstable landslide. Therefore, unreasonable excavation will cause a landslide.
What are the types of shoring?
Types of shoringRaking shoring.Flying shoring.Dead shoring.
How long does it take to excavate a trench?
about 12 hoursIt takes about 12 hours to dig 100 linear feet of trench. Measure the number of linear feet you need to dig and multiply that by 0.12 for an approximate labor period.
What is benching in excavation?
“Benching (Benching system)” means a method of protecting employees from cave-ins by excavating the sides of an excavation to form one or a series of horizontal levels or steps, usually with vertical or near-vertical surfaces between levels.
What is the difference between shoring and shielding?
Shoring should not be confused with shielding by means of trench shields. Shoring is designed to prevent collapse, whilst shielding is only designed to protect workers should collapse occur. Most professionals agree that shoring is the safer approach of the two.