They are formed by installing steel H-beams, Universal Columns (UC’s), or sometimes universal channel sections into rotary bored, CFA or SFA piles and can be used with and without anchors.
Concrete precast, prestressed or timber panels are subsequently installed between them to allow for earth retention.
King post retaining walls are suitable for most earth retaining structures, typically used for basements, the retention of embankments and slopes and for flood defence walls. Suitable for both permanent and temporary retention conditions.
The construction of a kingpost wall begins with the drilling of a hole typically at 1-3m centres using a variety of drilling and piling rigs from large rotary to high powered CFA to restricted access piling rigs. The option of piling rig will depend upon local ground conditions and access constraints. Site constraints permitting, the steel H piles can be driven directly into the ground depending on soil conditions
King post walls are installed by drilling a hole using the Continuous Flight Auger (CFA) technique, rotary bored, or SFA installing piles along the line of the wall, with spacing dictated by the width of the wall panels.
Isolated steel H-beams are then installed within the concreted hole to level and height as dictated by the design. Timber sleepers, beams, sheet piles, steel panels, pre-stressed and precast concrete panels or timber panels are subsequently installed between the webs of the H sections as excavation proceeds forming an embedded retaining structure.