of the clip is bolted by means of two 2 spaced cap screws to hilti anchors which are installed in drilled holes in the concrete of the airport apron near its upper end the rib or channel 12 is rigidly bolted to the upper end of an upright main strut or structural member 16 at its lower end the strut or post 16 is bolted to the vertical leg of a rear clip 18 the horizontal leg of the rear clip 18 is bolted to the apron by means of two 2 spaced cap screws that mate with hilti expansion anchors that have been installed in drilled holes in the concrete apron the strut 16 is comprised of angle iron a second concave curved rib or channel or structural member 20 located to the rear of the rib 12 is pivotally secured at its lower end to a front clip 22 the horizontal leg of the clip 22 is bolted to the apron by means of spaced cap screws mated to hilti anchors installed in drilled holes in the apron near its upper end the rib 20 is bolted to the strut 16 angle iron cross braces 24 and 26 are added to the support frames when the blast deflector is used to deflect the blast from high thrust airplanes such.