What is open timbering?
The usual method of setting timber or steel supports in mines–they are spaced from 2 to 5 ft (0.6 to 1.5 m) apart, with laggings and struts to secure the ground between each set. The method is used in ground that does not crumble or flow. See Also: close timbering.
What is close timbering in trenches?
The setting of timber sets and lagging very close together when shaft sinking or tunneling through very loose ground or crushed coal in thick seams.
What are different methods of timbering?
There are five main methods for timbering: Stay Bracing. Box Sheeting. Vertical Sheeting.
What is timbering and strutting?
A method of giving the temporary support to the side of deep trench or when subsoil is loose or very soft is known as timbering (i.e. shoring) and strutting. It consists of timber planks and strut to give temporary support to the side of trench.
What does timbering mean?
Definition of timbering : a set or arrangement of timbers.
What is timbering in civil engineering?
Timber denotes wood which is suitable for building or carpentry and for various engineering and other purposes. The word timber is derived from an old English word ‘timbrian’ which means to build.
What is timbering in excavation?
This is the process whereby temporary support are provided to the sides of an excavation so that the trench will remain open for easy access. Timbering is also called planking or strutting.
In which type of soil timbering is required?
This method is used in loose soil and when the depth of excavation does not exceed 4.0 m.
What is shoring and timbering?
Timbering of trenches, sometimes also known as shoring consists of providing timber planks or boards and struts to give temporary support to the sides of the trench.
Why should timbering be used when excavating?
to prevent damage to adjacent property which may occur if trenches are got out too close to structures such as boundary walls, etc.; if the trench bottom is below the foundation the wall may become unsafe and will possibly overturn.
When timbering in loose dry soils How should the sheeting be place?
The method consists of placing vertical sheets (called sheathing) or polling boards opposite each other against the two walls of the trench and holding them in position by one or two rows of struts. The sheets are placed at an interval of 2 to 4 metres and generally, they extend to the full height of the trench.