UCLH Proton Beam Facility


Proton Beam Therapy (PBT) is a form of radiotherapy used to treat certain types of cancers. The PBT facility at University College London Hospital (UCLH) was the first of its kind to be developed in the UK. The role of ByrneLooby in this project was to design the diaphragm wall for this substantial project.

The project involved a standard diaphragm wall excavation but within very tight constraints. The site location is close to existing sensitive buildings and roads as well as a busy London Underground line. It was also one of the deepest excavations in London at the time at approximately 24 metres in depth.  Ground movements due to the construction were restricted to tight criteria. Discussions surrounding the number of levels of props required, the thickness of the diaphragm wall, and adequate panel reinforcement took place in order to find the best solution that would adhere to these movement guidelines. It was also necessary to preload the props to reduce movement.

A high level of care was undertaken and technical skill required in order to ensure that the design suited the client’s methodology, fabrication process and the main contractor’s construction sequence. It is an ongoing element of our culture at ByrneLooby to work in partnership with our clients, listen to their preferred construction methods and ensure our design reflects their construction preferences.



“I enjoyed working on the UCLH project as it was my first time to work on a project requiring a diaphragm wall. The design of the wall was particularly complex due to the site layout and surrounding conditions and it had to be coordinated with other temporary works designers. I gained appreciable experience in detailing multifaceted diaphragm wall cages and I look forward to utilising the knowledge I have gained on future projects.”

Christo, Senior Engineer


Project Photos