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I have some questions about beam guard blocks.
|Date||June 10, 2009|
Traditionally, wood and plastic blockouts have extended both above and below the W-beam guardrail element. The blockouts have been either 14 or 14.25 in. long. As such, up to 1 in. of blockout may be exposed above and below the rail. For these situations, upper and lower surfaces are either cut to be horizontal or sloped inward as one moves to the back of the block. For thrie beam systems, we have used shortened blockouts or tapered blockouts to allow the lower corrugation to fold back some to reduce wheel/rim loading or to remain vertical when the rail deflects, thus reducing the potential for vehicle climb up the rail face.
Therefore, we do allow blockouts to extend above and below the rail element. For specific designs, we have modified blockouts to improve barrier performance. For your situations, the blockout size should correspond to those blocks approved for use with the guardrail systems in question.
|Date||June 11, 2009|
130 Whittier Research Center
2200 Vine Street
Lincoln, NE 68583-0853
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