Temporary arrangement of boardings, wailings and struts which is provided to give support to sides of trench is known as___________.
Timbering
Understanding Temporary Trench Support
When excavations are made, especially for trenches, the sides of the trench may not be stable and can collapse. To prevent this and ensure the safety of workers inside the trench, temporary support structures are installed. These structures are designed to hold back the soil and keep the trench sides open and stable.What is Timbering?
Timbering is the term used for the temporary support system provided to the sides of trenches and other excavations. This system typically consists of several components:
- Boardings: These are vertical or horizontal planks placed against the sides of the trench.
- Wailings (or Walings): These are horizontal members placed against the boardings to provide support and distribute the load.
- Struts: These are horizontal or inclined members placed between opposite wailings or sides of the trench to keep them apart and resist inward pressure.
The arrangement of boardings, wailings, and struts working together forms the timbering system, effectively supporting the trench sides.
Comparing Options for Temporary Support
Let's look at the other options to understand why they are not the correct term for this specific temporary support arrangement:
- Centering: This refers to temporary structures (often made of timber or steel) used to support arches, domes, or formwork for concrete until the structure is self-supporting. It is used in overhead or curved construction, not for trench sides.
- Shuttering: This is another name for formwork, which is a temporary structure used to contain concrete while it is cast and setting. While it is temporary and structural, it is specifically for shaping concrete, not supporting soil sides in a trench.
- Poling: While 'poling' can sometimes relate to using poles for support, in the context of trench support systems like those described with boardings, wailings, and struts, the comprehensive term is timbering. 'Poling boards' are a component sometimes used in timbering, but 'Poling' alone doesn't describe the entire system.
Conclusion on Trench Support Terminology
Based on the description provided – a temporary arrangement of boardings, wailings, and struts used to support the sides of a trench – the accurate technical term is Timbering. This system is crucial for preventing trench collapse and ensuring safety during excavation work.
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