Roadway safety barrier
Road safety barrier comprising: concrete bottom parts ( 1 ); concrete top parts ( 2 ) coupled on the bottom parts ( 1 ), and attaching means ( 3, 31 ) of the successive top parts ( 2 ) at their opposite ends. The bottom parts ( 1 ) have an upper surface provided with a longitudinal channel ( 11 ) for coupling in the longitudinal direction and with the possibility of limited vertical displacement of a longitudinal extension ( 21 ) protruding from a lower surface of the top parts ( 2 ); the channel ( 11 ) and the extension ( 21 ) have similar cross-sections and dimensions calculated so that the top part performs a lateral rotation of a determined amplitude, in the event of a vehicle impact, and absorbs a significant part of its kinetic energy.
1. A road safety barrier comprising a series of prefabricated concrete parts, of constant cross-section, facing each other at their longitudinal ends, which include: bottom parts ( 1 ), forming a barrier base, and top parts ( 2 ), forming a barrier body, supported and coupled on the bottom parts ( 1 ); characterised in that the bottom parts ( 1 ) have an upper surface provided with a longitudinal channel ( 11 ) for coupling in the longitudinal direction and with the possibility of limited vertical displacement of a longitudinal extension ( 21 ) protruding from a lower surface of the top parts ( 2 ); said longitudinal channel ( 11 ) of the bottom part ( 1 ) and said longitudinal extension ( 21 ) of the top part ( 2 ) having similar cross-sections, and with calculated dimensional differences so that, in the event of an impact of a vehicle, the top part maintains its integrity and performs, with respect to the vertical median plane (p) of the bottom part ( 1 ), a lateral rotation of an amplitude determined and limited by the coupling means of the top and bottom parts, the coupling means comprising the longitudinal channel ( 11 ) of the bottom part ( 1 ) and the longitudinal extension ( 21 ) of the top part ( 2 ); the longitudinal channel ( 11 ) and the longitudinal extension ( 21 ) each comprise at least: an upper segment (a) of decreasing overall width towards a lower area, and a lower segment (b) of a width between the greater width and the lesser width of the upper segment (a).
2. The barrier, according to claim 1 , characterised in that the successive top parts ( 2 ) are connected by attaching means ( 3 , 31 ) that cooperate with the coupling of the extension ( 21 ) and the channel ( 11 ) in limiting the lateral rotation of the top parts ( 2 ), in the event of an impact of a vehicle against the barrier.
3. The barrier, according to claim 1 , characterised in that the longitudinal channel ( 11 ) of the bottom part ( 1 ) and the longitudinal extension ( 21 ) of the top part ( 2 ) have rounded longitudinal edges.
4. The barrier, according to claim 1 , characterised in that the bottom parts ( 1 ) are anchored to the ground, with no possibility of displacement.
5. The barrier, according to, claim 1 , characterised in that the bottom parts ( 1 ) and the top parts ( 2 ) have the same length and are vertically aligned in pairs; or mutually displaced in a longitudinal direction, in a staggered way.