| 摘要 |
<p>A metallic guardrail barrier of the type comprising a sustaining post (1), a spacing member (2) extending parallel to the ground, secured at one side to the said sustaining post and carrying at the other side the rail (N), said spacing member being in the form of a substantially flat vertical plate (102) presenting a front portion (502) and a rear portion, in which the said spacing member (2) is connected to said sustaining post (1) by its rear portion so as to be swingable about a fulcrum (7) under the control of a shock absorbing means including a weakened region (9) on said rear portion of the spacing member at a location above and spaced from said fulcrum (7) and a pin (8) which connects said spacing member (2) and said sustaining post (1), and passes through said weakened portion (9), such that said pin (8) causes a tearing of said weakened region (9) when said rail (N) is impacted by a vehicle and said spacing member (2) moves about said fulcrum (7). The spacing member (2) presents at its front portion (502) a weakened region (4, 5) progressively increasing from the top to the bottom of the said front portion. <IMAGE></p> |
