Security barrier posts, security barriers and methods of building security barriers

A method of building a security barrier comprising a plurality of security barrier posts and a concrete bed in which said underground footings of said security barrier posts are received;

• each said security barrier post comprising:
• an underground footing comprising:
• a substantially vertical shaft having an impact facing side which is positioned to receive an impact, a rear facing side opposite to the impact facing side, a spring steel back plate and a spring steel foot plate both arranged substantially perpendicular to said shaft and extending to at least one side thereof, wherein:
• said footing is configured to be at least partially buried, said back plate is attached to said rear facing side of said shaft and said back plate is configured to be buried below a surface when said footing is at least partially buried such that said back plate is flush with or slightly below said surface, and said foot plate is located towards the lower end of said shaft, at a position vertically spaced from said back plate such that, under impact, the joints between said front plate and said shaft, and between said back plate and said shaft, are compressed;
• and a barrier post that extends above said surface comprising a plurality of vertical spring steel elements, that are not joined together at their upper ends, said plurality of vertical spring steel elements aligned between said impact facing side of said shaft and said rear facing side of said shaft;
• and wherein said concrete bed includes a plurality of reinforcement cages, each said reinforcement cage comprising a plurality of cross members and a plurality of longitudinal members, said longitudinal members extending outwardly from at least one side of said cross members of each said cage;
• wherein said longitudinal cross members of one said reinforcement cage overlap with said longitudinal cross members of an adjacent said reinforcement cage;
• the method comprising the steps of:
• excavating a shallow trench,
• locating said plurality of said post footings within said trench such that said footing is at least partially within said trench;
• inserting said reinforcement cages to either side of said at least one barrier post footing such that adjacent said reinforcement cages overlap one another in the region of, or adjacent to, said footing;
• and
• filling said trench with concrete to form said concrete bed such that said back plate of said footing is located at a position that is flush with or slightly below a surface of said concrete.