Committed to high standards and quality

How are Capping Beams formed?

November 8, 2020

Capping beams form the top of the constructed piles, providing an additional structural support to tie the top of the piles together and form a solid wall.

Capping Beam

What is the function of a Capping Beam? 

  • Prevents or inhibits lateral displacement of the installed retaining piles or columns during the excavation process
  • Transfers vertical structural loads from the building when constructed to the piles, columns or retaining structures, which can include shotcrete
  • Capping Beams are also suitable for distributing the weight of a load-bearing wall or of close-centred columns to a line of piles.

The last function of the Capping beams differs it from the Ground Beam which is provided between adjacent Capping Beam as a structural element to improve to a line of piles.

Capping Beam

What are Capping Beams and how are they formed? 

Capping beams are structural elements made of steel and concrete. Capping beams create the foundation for the slab and helps hold the earth and the neighbouring houses back.

There are two ways of constructing Capping Beams:

  • In-situ using a mould with plywood and
  • Steel, where most of the strength comes from

The steel reinforcement bars are placed over the top of the piling cages with logs designed to the engineers specifications. The concrete is sprayed onto it, once the steel reinforcement is complete. This is how the capping beam is formed. Once the concrete is dry the formwork can be removed, and the basement excavation can start. This is a ground preparation phase for pouring the capping beam.

Capping Beam

The Capping Beam should be kept clear of the ground where the purpose of the piles is to overcome the problem of the subsoil shrinkage. This can be done by casting the capping beam on polystyrene or other compressive material, allowing an upward ground movement without damage to the beam.

A construction method using concrete block walls can be used as an economical way of construction. First the wall is backfilled with soil and then the space can be filled with concrete. This way the formwork and extra excavation required to position the formwork it is not needed.

Roniak Piling delivers the Capping Beam on site to install in position. The rear face of the Capping Beam is formed to the set-out lines and when ready concrete is sprayed to the Capping Beam.

Roniak Piling uses top to bottom concrete spraying method, so the concrete is only sprayed ¾ of the width of the Capping Beam leaving the front ¼ exposed. This way the shotcrete wall is sprayed continuously from top to bottom, eliminating a construction joints on the wall face. Find out more about the advantages of this methodology of designing Capping Beams here.

Want to get more advices and solutions for your building projects? 



Or follow us on:

To organise a quote send us an enquiry via our Enquiry Form or call us on 0412 209 069

 We would love to hear from you! 

Go back