Figure 27a. Subsidence
pit under the corner of a house. The beam, drilled pier and jack hold the
house in position and level the building. Figure 27a. Subsidence
pit under the corner of a house. The beam, drilled pier and jack hold the
house in position and level the building.
Figure 27b. Close up of
a beam, drilled pier and jack. (photos courtesy of L. Floyd, Office
of Surface Mining)