Discrete piles are installed at a predetermined spacing with horizontal lagging. Whether an open or low headroom site, Keller has the equipment and experience to design and construct the optimal solution.
- Support excavations
Typically cast-in-situ piles are drilled at regular intervals along the planned excavation perimeter. In low headroom or difficult drilling conditions, micropiles may be used. Lagging consisting of wood, steel or precast concrete panels is inserted behind the front pile flanges as the excavation continues. Additionally lagging, shotcrete, or a formed wall may be applied. The lagging efficiently resists the load of the retained soil and transfers it to the piles. The walls can be designed as cantilever walls or receive additional lateral support from anchors or bracing. They can also be designed as temporary walls or permanent walls when beams are coated and permanent wall facing is used. This wall type is not suitable where high water pressures or flows exist in the soil to be retained. This is usually the simplest, fastest and cheapest type of embedded retaining wall in relatively stable soils.