Shoring for Underground Victorian Garage Using Steel Frames Positioned on Temporary Foundation
Older buildings often move out of plumb and square position because they have sustained settlement or earthquake shocks. By using the appropriate shoring, a builder can level the building and, with the aid of chains and pulley assemblies, bring the building back into a plumb position. Advanced laser technology can ensure that the building becomes completely plumb and level.
Shoring systems for excavated ground
Often, during excavation operations, such as removing a section of a hillside, the remaining soil needs to be outfitted with temporary shoring until new retaining walls are built.
Shoring excavated ground for soil retention is a highly specialized operation that requires engineering knowledge as well as substantial experience. How and to what extent the ground needs to be shored is very dependent on soil properties. Every type of soil presents its own set of unique challenges: sandy soil, rocky soil or expansive clay. The grade of the hillside, the type of permanent retaining wall that is designed and the available access for equipment also need to be taken into consideration.
Examples of shoring mechanisms that are commonly used to shore excavated ground are: soldier pile and lagging, soil nails & shotcrete, and pressure grouting.
Soldier pile and lagging holds soil in place by using vertical steel piles with horizontal lagging (heavy wood boards, steel or concrete panels) to line the sides of the excavation. H-piles are drilled or driven at regular intervals along the excavation perimeter, and lagging is inserted as the excavation proceeds. The lagging resists the load of the retained soil and transfers it to the piles.
Soil nails & shotcrete is often used on excavated soil where high unsupported cuts are produced. Bars are installed at regularly spaced points across the slope face and then reinforced with soil nail head plates. Flexible reinforcing mesh may be also held against the soil face beneath the head plates for extra strength.