Space Creation – Masonry Vaults and Arches

On numerous occasions we have used a ‘Pynford’ stooling technique to create an opening through a wall between two adjacent arches. This can be combined with a project to lower the ground to create useable space. This would usually involve the use of underpinning techniques using conventional techniques or alternatively by use of further sacrificial stools.

Occasionally we are asked to form an opening above the existing arch springing level. Depending on the circumstances surrounding the project, this can sometimes be achieved by use of ‘Pynford’ stools adapted to accept a balanced load from the existing masonry arches either side of the dividing wall. When access is available to the upper side of the wall, it is possible to form an RC beam to maintain the lateral thrust of the retained arch masonry. The following series of photographs illustrate this technique.