| 摘要 |
safety fence of highways. SUBSTANCE: barrier fence has vertical hollow posts 1 of variable or fixed sectional area along vertical line. Closed-section horizontal beams 2, 3, 4 of rectangular or C-shape in cross section are fixed in three decks on posts 1. Buffer inserts 5 are placed between horizontal beams 2, 3 of lower and intermediate decks and vertical posts 1. Beams 2, 3, 4 are installed at distance of 140 to 300 mm, 390 to 550 mm, and 800 to 1050 mm from foot through height for beams of 2, 3, and 4 of lower, intermediate, and upper decks, respectively. Beams 2 and 3 of lower and intermediate decks have small overhang from vertical post in comparison with upper-deck beam 4. Buffer inserts 5 are rectangular box-section structures; their length is from 40 to 120 mm. EFFECT: increased impact-energy absorption time. 3 cl, 4 dwg
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