Construction Of Wll Tank Traps


I was walking along a Norfolk beach when I came across these Wll tank traps.
Having no knowledge in the construction of such things, I was wondering what part the pieces of slate, in the corner junction between the base and the top, played/play in the construction?
Can anybody shed any light on their purpose?

My guess:

I assume the block and base were made separately and then cemented together. If so, when placing the block on top of the base, I’d guess there was a reasonable risk of damage at the corners, so pieces of slate were used to spread the load and protect the base at those locations.

1 Like

I assumed something similar.No knowledge but it looks as though they could have been used a ‘skids’ while positioning the blocks.

1 Like

Or maybe to stop a block wobbling while mortar is packed into the joint between the block and the foundation, or between the block and another one?

All seem feasible.

My suggestion is the base is cast remotely or in situ.
The large block is cast in situ, using a wooden mould, placed on the base.
By positioning the slates in the base before the concrete sets, level pads would be created onto which the large block mould would be located.

Raising the mould slightly on the slates, might aid the removal of the mould. If it was being re-used.

1 Like

This topic was automatically closed 60 days after the last reply. New replies are no longer allowed.