They can be used under the following circumstances:
- When walls bulge out
- When walls crack due to unequal settlement of foundation and repairs are to be carried out to the cracked wall.
- When an adjacent structure needs pulling down.
- When openings are to be newly made or enlarged in a wall.
Types of shoring
- Raking shores (figure 1 to 3)
- Flying shores (figure 4 and 5)
- Dead shores (figure 6 and 7)
In this method, inclined members known as rakers are used to give lateral supports to walls. A raking shore consists of the following components:
- Rakers or inclined member
- Wall plate
- Sole plate
The following points are to be kept in view for the use of the raking shores:
- Rakers are to be inclined in the ground at. However the angle may be between and .
- For tall buildings, the length of the raker can be reduced by introducing rider raker.
- Rakers should be properly braced at intervals.
- The size of the rakers is to be decided on the basis of anticipated thrust from the wall.
- The centre line of a raker and the wall should meet at floor level.
- Shoring may be spaced at 3 to 4.5m spacing to cover longer length of the bar.
- The sole plate should be properly embedded into the ground on an inclination and should be of proper section and size.
- Wedges should not be used on sole plates since they are likely to give way under vibrations that are likely to occur.