Concrete palisade of rectangular blocks, to form a fence wall, has tongues and grooves at opposite end surfaces to lock neighboring blocks together

摘要

The concrete palisade (1) is composed of rectangular blocks joined together by tongues and grooves, to form a fence wall. At least one vertical tongue (4) is at one side surface (2) and at least one vertical groove (5) is at the other side surface (3). The tongues and grooves extend from the foot to the head of each block, and are arranged in a mirror image in relation to the center symmetrical axis (16). In cross section, the tongue depth (9) is deeper than the groove depth (10).