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Completed work

Step 3: Inspecting the lock

After a sixty year soak

Examples of 'honeycombed' concrete Examples of 'honeycombed' concrete

After clearing out the silt and rubbish, we spent November inspecting the metalwork and concrete along the walls and making any repairs that were needed. 

To do this we put scaffolding down into the lock so we could get right up to the walls to see if sixty years underwater had done damage. Where the concrete was stained, it meant that water had seeped through to the metal reinforcing bars inside and started rusting them. We cut back into the concrete until we reach the rebar, checked it, treated it for rust, and filled in the gaps.

In other locations we found that the surface of the concrete was a bit rough, where the cement had eroded. This is called 'honeycombed' concrete and is a potential point of weakness. We filled in any gaps with modern repairing materials.

Generally we found that most of the concrete was in good condition - a sign that the original workmen back in 1934 had done a good job.


This page is part of The restoration playbook