Trench shoring and excavation shoring is used for a variety of reasons including to build new roads, bridges, and buildings. It is often needed to build a structure or land over existing water. Each and every build is different and requires special safety preparations and considerations depending on the land. Depending on the trench conditions, different trench shoring methods are considered.
Why choosing the right trench shoring method is important
You wouldn?t build a building on any type of land. You would first run a variety of tests to look at the integrity and type of land the building will sit on. This is primarily for safety reasons, but it can also affect the condition of the building. If the land is too soft, the building is at risk of collapsing. For this reasons, careful consideration is put into excavation shoring and the specific excavation support methods that should be used. For example, a bridge will require a different structure and different trench shoring methods than the build of a 20 story building will.
Understanding the importance of soil type
Soil type plays an important part in both choosing the best trench shoring methods and in deciding if a structure should even be built upon it. Unit weight of soils refers to the weight of one unit of a particular soil. The weight of soil varies with type and moisture content. One cubic foot of soil can weigh from 110 pounds to 140 pounds or more, and one cubic meter (35.3 cubic feet) of soil can weigh more than 3,000 pounds. With soil being so heavy, it is crucial to properly plan for the right type of excavation shoring design.
Knowing how deep to dig
The build of almost any structure involves digging deep into the ground. When you dig and build deep into the ground, you are able to design with more space and use the planet as a type of structural support. That is unless you dig too deep and affect the overall integrity of the land. Then, your entire structure is at risk of collapsing. Earth excavation to a depth of 2 feet (0.61 m) below the shield is permitted, but only if the shield is designed to resist the forces calculated for the full depth of the trench and there are no indications while the trench is open of possible loss of soil from behind or below the bottom of the support system. To accurately test the condition of the planet and the trench, it is best to work with a structural designer.
Implications of heavy duty shoring
The majority of build projects do not require extensive digging. The dig amount is much above the 2 feet limit and thus, do not require as much testing. However, some projects including the build of a new bridge or extremely tall building do require extensive digging. Heavy duty shoring may also be present when structures need to be built directly into a body of water, such as with a fast installation bridge. In these special circumstances, trench shoring methods are even more important. Trench boxes are used for testing in these heavy duty shoring situations. As a general rule, the bottom vertical height of the trench must not exceed 4 feet (1.2 m) for the first bench. Subsequent benches may be up to a maximum of 5 feet (1.5 m) vertical in Type A soil and 4 feet (1.2 m) in Type B soil to a total trench depth of 20 feet (6.0 m).
A lot is involved in the build of a new structure, especially one that requires excavation shoring. Excavation shoring requires careful measurements and tests to ensure the integrity of the planet is held. Ignoring these safety regulations can lead to less than sturdy buildings and can eventually affect the planet. Heavy duty shoring requires, even more, preparation and testing. Additionally, trenches and different trench shoring methods are used to further increase safety.