(57) 9 A wall comprising a number of building blocks or elements (2) is formed by laying
successive courses next to and on each other. The blocks or elements (2) are provided,
at least at their horizontal contact faces, with connection means comprising for each
block or element at least one longitudinal groove (3) in at least one of the two horizontal
surfaces, at least one recess having a vertical centre line disposed in the vertical
central plane of the groove and leading out into the other horizontal surface, together
with a pin (5) which fits into the recess. If the pin (5) is fitted into the recess
it has an outwardly projecting part which fits into the groove (3) of an adjoining
block or element (1). The blocks or elements (1) are in addition joined together by
mortar.
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