Kingpost retaining walls

Kingpost retaining wall design and UK price calculations: A quick overview

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A Kingpost retaining wall is a cantilever design. The posts are normally made from steel universal columns and are embedded into the ground.

The first step is to have the king post designed by a structural engineer. Learn more about the design process.

The soil information determines the size of the section and the embedment depth of the king post.

The technique for installing the posts is either to drive them or to vibrate them into the ground. If they’re going to be vibrated, the ground needs to be suitable for vibration.

Alternatively, the posts can be drilled in using an auger. The posts are put into the hole and then concreted in. In all cases, a piling contractor is required to carry out the post-installation work.

Once all the posts are installed, the panels are dropped into the channels of the steel posts.

The panels can be concrete or timber. Concrete panels can be plain concrete, textured, and colour textured.

Plain concrete panels are mostly used in industrial situations.

Kingposts are very handy for reinstating, repairing, or renewing existing retaining walls. Kingposts can be built very close to the existing retaining wall and don’t take up too much space. For an example, go to this case study.

The video includes a design table for the Kingpost retaining wall. They are approximate designs only. The actual section size and embedment design are carried out by a structural engineer using special software that analyses the soil data and load case. Learn more about wall engineering and design.

Kingpost retaining walls are very effective at low levels but become very expensive, over 3.5m in height, due to the section size and depth of embedment. For example, for a 3.5 metres height, the post length is 9 metres long with an embedment depth of 5.5 metres.

Every design is different. We highly recommend that you go to the retaining wall design page to learn more about the design process.

Head over to our King post wall type info page to learn more.