Figure 4-25.Position of walers before placing sheetpiling for
Figure 4-27.Method of bracing when two lengths of
sheetpiling are used.
Figure 4-26.Trench shoring with trench jacks for cross
2. Bracing or shoring of trenches should be carried
along with the excavation.
3. Cross braces or trench jacks should be placed in
a true horizontal position, secured to revent sliding,
falling, or kickouts.
4. Portable trench boxes, sliding trench boxes, or
shields should be designed, constructed, and maintained Figure 4-28.Bracing with jack screws in hard soil.