King Post Walls, also known as Soldier Piles, are some of the oldest forms of retaining systems used in deep excavations. King Post Walls have successfully been used since the late 18th Century in metropolitan cities like New York, Berlin, and London. Aarsleff has a wealth of experience installing king post walls across the UK and we’ve broken down your top five questions about this retaining wall technique.
King Posts are isolated steel columns that are installed along the line of the proposed retaining wall typically at centres between 1 and 3m. The space between the posts is filled, over the retained height, using a variety of different solutions but most commonly a precast concrete panel. King Post Walls can be designed to Eurocode 7 or British standards and can be analysed in the temporary or permanent conditions. The design life of a King Post Wall is generally 50 years or more depending on the requirements.
King Post Walls may be used for different retention applications and heights in different ground conditions, including rock. They are suitable for most earth retaining requirements, including retention of embankments and flood alleviation. Check out our project at Jewsons, Chesterfield to see a large scale use.
King Post Walls are installed first by drilling a hole using an Insitu piling rig which is then filled with concrete at the base and a steel H-beam. Prestressed concrete panels, or steel sheets, are then inserted between these H-beams to form a wall and the earth around is excavated to leave the finished, embedded retaining wall.
King post walls are most typically formed of steel H-beam piles and prestressed concrete panels. Steel sheets can, however, be used in place of the concrete panels if required. If tiebacks are needed, this can be achieved through ground anchors – such as Aarsleff installed at Sunderland Strategic Transport Corridor.
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