DE10249582A1 - Modular central crash barrier system for roads has two lines concrete edging blocks separated by ballast blocks - Google Patents

Abstract

A modular central crash barrier system for roads has the outer edges of the two fast lanes marked out by lines of concrete edging blocks. The space between the blocks is filled with concrete ballast blocks which provide a retarding system for the edging blocks and prevent vehicles crossing over to the other carriageway. The ballast blocks can be rectangular with one edge having a similar height to the edging blocks when stood on edge. The ballast blocks can also have a stepped profile to interlock with similar stepped blocks to cater for different spacing of the edging blocks.

Description

Roadside protective walls for Stopping vehicles when high demands are made on breakthrough security - such as in the median of motorways - made of in-situ concrete or from precast concrete parts in double row with backfill (as Plant trough). Such wall systems work in the event of a vehicle collision as rigid obstacles that stop heavy trucks but for light passenger cars generate high loads. If on backfill such double rows are dispensed with, when the vehicle collides to expect displacements of individual wall elements. Through this local yielding extreme vehicle loads can be avoided as well as in the Standard DIN EN 1317 test method for the Approval of such walls fulfill; however, such a compromise compromises breakthrough security heavy truck.

A balanced compromise is supposed to for passenger cars Avoid extreme loads and yet breakdown security for trucks guarantee. It is advantageous to have the properties of a portable Wall system made of prefabricated parts to spatial and, if necessary also adapt to changing traffic conditions in individual cases to be able to. Therefore it is proposed to use wall systems instead of the usual ones backfill individual prefabricated filler pieces, for example made of Concrete, to be used in different numbers and arrangements (picture 1). By suitable shaping of such filler pieces, as well as by their Combination with deformable elements, wall systems are optimized Impact behavior enabled. This Wall systems can be easily set up using hoists, repair and change - if necessary also open at short notice.

effect

The one immediately behind a wall arranged fill pieces effect in the event of a vehicle collision, an increase in the wall mass encountered; additionally they cause increased friction and in the appropriate arrangement on gap of the wall elements relieve their connection. By the number the one arranged behind the wall within a section of the route Filler is the effective wall mass can be changed within wide limits in the event of an impact (Figure 2, schematic). With a positive arrangement of the pieces between the both walls a double row (picture 3) also carries the opposite Wall to enlarge the Mass at. So that the total mass of a wall system is not already If light vehicles impact, the impact side can (First) wall to be allowed a certain shift until the support on fillers or on the second wall (picture 4). In the median of motorways it serves to improve road safety, a shift of the averted (second) wall to avoid oncoming traffic. It follows as important feature of the proposed wall system: at the end of a for permissible or The displacement deemed necessary is the remaining impact energy of a pick up or redirect heavy vehicle without further displacement. To be aware of in the course of a violent impact process when inserting one delayed support the other jerky ones Dampen loads, can deformable elements between filler and wall be arranged. Through several layers of stacked fillers not just an enlargement of the Mass but also an adaptation to profiled walls achievable (Photo 5). If necessary, the vertical arrangement of suitable fillers (Fig 6) a protective effect against glare and against accidental loss Charge can be achieved; at the same time there is a further increase the wall mass in relation to the section of the route.

basic version

For easy manufacturing, warehousing and The basic version of the filler has the application Shape of a cuboid, its length and its mass approximately reach the values of half a wall element; the heights of cuboids and wall element are the same (picture 1). If necessary, the Dimensions of the cuboid are advantageously chosen so that by combining individual cuboids the usual distances between barriers positive in the median or in the desired one Scope to be filled. Dependent cuboids of different dimensions can be expedient from different wall elements.

Variant 1 (grooved)

• a) durch den Werkstoff, zum Beispiel Stahl oder Beton,
• b) durch die Wanddicke des Rohres,
• c) durch die Füllung des Rohres, z. B. mit weiteren Rohren, und auf diese Weise wechselnden Anforderungen angepasst werden.

Filling pieces with a groove make it possible to fill different distances between two walls in connection with pipes of different deformability and different outside diameters (Figures 7.1, 7.2, 7.3). The ductility of the tube can be determined

• a) by the material, for example steel or concrete,
• b) by the wall thickness of the tube,
• c) by filling the tube, e.g. B. with additional pipes, and in this way changing requirements.

Variant 2 (graded)

With a multi-step filler in pairs Arrangement (Figure 8.1) the filling extend in several stages (Figure 8.2) or shorten it (Figure 8.3) so that different distances between two walls are form-fitting or are to be filled with an opening intended as a displacement path. A shortened order is a further possibility for shortening after rotation by 90 degrees (Figure 8.4) available. The dimensions of a stepped filler can be changed of length and width as well as step height and step depth (Figures 9.1 and 9.2) to suit different requirements.

Variant 3 (wedge-shaped)

When replacing the described step through an oblique Plane as sliding surface (Figures 10.1 and 10.2) is a stepless adjustability Wedge effect achieved. This allows depending on the angular position of the sliding surfaces and arrangement of the filling pieces (pictures 11.1, 11.2, 11.3) in the event of an impact, additional friction and (longitudinal) displacement of fillers to the energy consumption or mass effect of the bulkhead system to increase.

Claims (8)

Protective wall system with filler pieces in a special arrangement and execution preferably to influence the deformability and breakthrough security in the median of motorways, the filler pieces between two rows Prefabricated wall elements are arranged so that they are by number and location to the different impact conditions of people and trucks and easily adapt to changing traffic conditions if necessary adjust. Protective wall system according to claim 1, with at least a form-fitting used filler each behind elements of a row. Protective wall system according to claim 1, with at least a form-fitting insert used between two opposite each other Elements of both rows. Protective wall system according to claim 1, with at least a filler inserted at a certain distance behind elements in a row. Filler after claims 1 and 3 in the form of a cuboid, the same height as a Element of half its length and has half the mass. Filler after claims 1 and 3 with at least one groove for receiving additional, preferably round components of different outside diameters. Filler after claims 1 and 3 in a stepped form, so that when used in pairs graded in different arrangement, result in different distances. Filler after claims 1 and 3 with a sliding surface, so that when used in pairs in different arrangement stepless, different distances and if necessary impact forces be broken down into components.