Patent ID: 8152408

Claim:
A method of installing a barrier wall against a terrorist threat selected from the group consisting of a speeding vehicle and an explosive blast, the method comprising the steps of: a) placing a second barrier on a ground surface and flat up against a first barrier, wherein the first and second barriers comprise first and second tunnels respectively, and wherein a first rectangular steel bar has been removably positioned within the first tunnel; b) placing a second rectangular steel bar so it extends through the second tunnel, wherein the second bar has a length that is longer than the second barrier, and wherein an end of the first bar overlaps against a first end of the second bar; c) coupling the first and second bars together where they overlap against one-another; and d) installing a first retainer element at the second end of the second bar to prevent the second end of the second bar from being pulled completely into the second tunnel; whereby the first and second barriers are coupled with sufficient strength to remain coupled throughout a terrorist event that is one selected from the group consisting of a colliding terrorist's vehicle and a terrorist's explosive blast; and whereby forces from said terrorist event can be strong enough to cause the first and second barriers to slide across the ground surface and cause breakage of the first and second barriers where they interfere with rotation relative to one-another.