Wall construction system with interlocking prefabricated wall sections, uses wheel and groove arrangement to guide wall sections into position

A guide arrangement is provided for horizontally guiding the wall sections (2, 2a) into the correct position during construction of the wall (1). The arrangement comprises a wheel (5) protruding from a first horizontal side of the wall section and a groove (7) on the opposite second horizontal side of the wall section for locating a wheel on an adjacent vertical wall section. The wall sections are joined together by interlocking tongues. An independent claimS are also included for a method for constructing a wall using this system by positioning a first prefabricated wall section, applying mortar to one side of this wall section and placing a second wall section on top of the first wall section and using a guide arrangement in between the two wall sections to guide the second wall section into the correct interlocking position.