SI24396A - Steel road restraint with a trapezoidal reinforcement - Google Patents

Abstract

The object of the invention is a trapezoidal reinforcement steel road safety barrier that substantially increases the flexural rigidity of the bumpers of the steel road safety barrier of any cross-section with the use of sheet longitudinal reinforcement elements with a transverse profile of an open trapezoidal shape which, due to mutual match, prevent the deformation of buffers and trapezoidal reinforcing elements and thereby ensuring the maintenance of increased flexural rigidity even in the process of deformation of a steel road safety fence when a vehicle is encountered. This achieves a higher level of vehicle retention in the reduced dynamic cross-strain of the steel road safety fence, which contributes to increased road safety.

Description

Steel road safety barrier with trapezoidal reinforcement

The subject of the invention is the reinforcement of the steel road safety fence, which is used to ensure road safety in the collision of vehicles. Reinforcement according to the invention reduces the deflection of the safety barrier upon collision with the vehicles, thereby ensuring a higher level of vehicle restraint. The invention belongs to the field of fixed building structures.

The use of additional longitudinal reinforcing elements of the special shape of the invention increases the bending stiffness of the buffers, which are the main longitudinal load-bearing elements of the safety barrier, while ensuring increased flexural stiffness of the safety barrier even when it is deformed upon impact of the vehicle. By increasing the flexural rigidity of the safety fence buffers, its dynamic transverse deformation is reduced upon impact of vehicles.

Known solutions are based on the use of additional longitudinal reinforcements of safety fence buffers made of sheet steel, whose transverse profile is consistent with the transverse profile of the buffers partly over their entire height or only part of the height. This means that the shape of the reinforcement follows the shape of the buffer. Where the transverse profile of the buffer is convex / convex, the transverse profile of the reinforcement is convex / convex. This ensures a partial increase in the flexural rigidity of the guard rail bumper, but does not preserve its deformation during vehicle collision or minimize its dynamic transverse deformation. In patent application no. EP2108742 shows a reinforcement where the shape of the reinforcement follows the shape of the buffer.

A technical problem that is not satisfactorily solved by such consistent reinforcement of the buffer is that when the vehicles encounter the solutions described above, due to the consistency of the shape, they also result in consistent deformation of the buffer and reinforcement. Both the bumper and the corresponding reinforcement are partially or fully flattened in the cross-section during the deformation of the vehicle, resulting in a significant reduction in the flexural rigidity of the reinforced bumper thus leading to a greater dynamic transverse deformation of the safety barrier.

The object and object of the invention is to substantially increase the flexural rigidity of the safety fence buffers, wherein the transverse profile of the safety fence bumper is usually in the form of double or triple v, that is, in the form of waves with rounded or sharp edges. This is achieved by the use of specially designed sheet metal longitudinal reinforcement elements whose transverse profile does not correspond to the transverse profile of the safety fence bumper. This means that the shape of the transverse profile of the reinforcing element does not formally follow the shape of the cross profile of the buffer of the security fence. In this way, the harmonic deformation of the buffers and reinforcement elements is prevented, thus ensuring the preservation of increased flexural rigidity even in the process of deformation of the safety barrier upon collision of vehicles.

According to the invention, the problem is solved by the optimum shape of the longitudinal reinforcement elements of the guardrail, made of sheet steel, having the longitudinal edges curved so that the transverse profiles of the reinforcing elements form an open trapezoid whose vertices correspond to the transverse shape of the buffers. Mechanical matching prevents the free deformation of the transverse profile of the buffers as well as of the reinforcing elements, thus ensuring an increase in the flexural rigidity of the safety barrier and its preservation during vehicle collision.

The invention is described in the embodiment and in the drawings showing:

Figure 1: Steel road safety fence with trapezoidal reinforcement element Figure 2: Steel road safety fence with spacer and trapezoidal reinforcement element

Figure 3: Trapezoidal reinforcement of the steel road safety fence of different profiles shown in cross section

Figure 4: Trapezoidal reinforcement element of a steel road safety barrier

The reinforced steel road safety barrier consists of the main elements, namely the bumper 1, the pillar 2 and the reinforcing element 3, as shown in Figure 1. The buffers 1 and the reinforcing elements 3 are interconnected by the overlap screw connections and fixed to the columns 2 at specified intervals. Reinforcement elements 3 extend over the entire length of the bumper 1. The reinforced guardrail can also be implemented with spacers 4, as shown in

Fig. 2. The basic function of spacers 4 is to connect buffers 1 and trapezoidal reinforcement elements 3 to the pillar 2, thereby ensuring the positioning of the buffer 1 and trapezoidal reinforcement element 3 at a certain distance from the pillar 2 and height above the carriageway.

The reinforcing element 3 is made of sheet steel of selected thickness and length equal to the length of the buffer 1 and having curved longitudinal edges 5 and 6 to form, in cross-section, the shape of an open, uniform trapezoid, as shown in Figure 3 and Figure 4. The curved edges 5 and 6 are adapted to the respective shape of the transverse profile of the buffer 1, profile A or profile B in length and size of the sharp internal angles of curvature 11.12, such that their peaks 7, 8 correspond to the inner radius 9, 10 of the curvature of the waveform peaks buffers 1 as shown in Figure 3. Both the curved edges of the trapezoidal reinforcement element 3, which correspond to the inner radius of curvature of the peaks of the buffer waveforms, make it impossible for the transverse profile of both the buffer 1 and the reinforcing element 3 to deform freely due to the mutual mechanical matching. the bending stiffness of the bumper 1 and the reinforcing element 3 during the whole process is deformed the road safety rails when they hit the vehicle. Increasing the flexural stiffness of the bumper 1 of the steel road safety barrier, in addition to selecting the appropriate size of the inner sharp angles 11, 12 of the curvature of the edges 5, 6 of the reinforcing element 3, the choice of the appropriate size of the inner sharp angles defined by the shape of the profile of the bumper 1 is also controlled by the choice of the steel Sheets of different quality and thickness from which the reinforcing element 3 is made. By choosing a greater thickness and higher quality of the steel sheet, the bending stiffness is also proportionally increased.

The invention provides a substantial increase in the flexural stiffness of the steel road safety fence buffers of the various profiles used and, in particular, the preservation of their flexural stiffness upon vehicle collision. This helps to reduce the dynamic transverse deformation of the road safety barrier in the event of a vehicle collision and to increase road safety.

Claims (3)

PATENT APPLICATIONS 1. Trapezoidal steel road railing consisting of a buffer (1), a pillar (2) and a reinforcing element (3) with or without a spacer (4), characterized in that the reinforcing element (3) has longitudinal edges (1). 5, 6) are curved so as to form, in cross-section, the shape of an open, uniformly-shaped trapezoid, the curved edges (5, 6) being adapted to the respective shape of the transverse profile of the buffer (1) by the length and size of the sharp internal angles of curvature (11, 12). , that their peaks (7, 8) correspond to the inner radius (9, 10) of the curvature of the peaks of the bumper waveforms (1). Steel road safety fence according to claim 1, characterized in that the curved edges (5, 6) of the reinforcing element (3) are mechanically matched to the inner radius (9, 10) of the curvature of the bumper waveforms, thereby preventing free deformation the transverse profile of both the bumper (1) and the reinforcing element (3), thereby permanently ensuring the flexural rigidity of the bumper (1) and the reinforcing element (3) during the whole process of deformation of the road safety barrier upon impact of the vehicle. Steel road safety fence according to claims 1 and 2, characterized in that the increase in the flexural rigidity of the steel road safety fence buffer (1) is controlled by selecting the appropriate size of the inner sharp angles of curvature of the edges of the reinforcing element (3), the choice being appropriate the size of the inner sharp angles defined by the shape of the bumper profile (1), and by selecting the steel sheet from which the reinforcing element (3) is made.