Patent ID: 7654768

Claim:
A security wall comprising: a) a row of coupled barriers, each barrier comprising respectively: i) a mass of solid material that comprises two opposite sides, two cavities with one in each of the two opposite sides, and a tunnel through the mass of solid material between the two cavities, and ii) a tie-bar that extends through the tunnel and has two end-portions each of which penetrates at least a portion of a respective one of the two cavities; wherein each barrier is aligned side-against-side with another of the multiple barriers to form an adjacent pair; and b) for each adjacent pair an instance of means for coupling the tie-bar of one of the barriers of that adjacent pair to the tie-bar of the other barrier of that adjacent pair, and for each adjacent pair at least one instance of means for retaining in one of the cavities between the barriers of that adjacent pair for retaining the instance of means for coupling from entry into the tunnel that opens into said one of the cavities; whereby said coupled barriers have 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 at least some of the coupled barriers to slide across a supporting surface, and can cause breakage of solid material where the solid material interferes with rotation between adjacent barriers.