| 摘要 |
A barrier, which is intended to intercept a crashing airplane before it reaches a target, comprises an array of spaced towers. Each tower is several hundred feet tall. Each tower comprises a trusswork including three steel tubes, which are filled with a cementitious material, such as grout, in a triangular array wherein one tube is closer to the target. Guys interconnect the towers to one another and to ground anchors. Each tube comprises plural sections having end flanges, at which those sections are bolted to one another, and gaskets to prevent the cementitious material, as it is being pumped, from being extruded between the flanges before it has cured.
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