EP2905382A1 - Concrete safety barrier and method for producing a concrete safety barrier - Google Patents

Abstract

A Betonleitwand to the roadway boundary has a concrete body (10). Within the concrete body (10) usually a plurality of reinforcing elements (16) are arranged. To avoid corrosion of the steel having reinforcing elements (16) these are provided in the region of joints (14) with a plastic sheath (20).

Description

The invention relates to a Betonleitwand for road boundary and a method for producing such a concrete guide.

In particular, between the lanes of highways or highways is reduced by the attachment of such Betonleitwände the risk that a motor vehicle, especially a truck gets on the opposite lane.

Concrete guide walls for road boundary have a concrete body. Within the concrete body usually several longitudinally extending reinforcing elements in the form of steel cables or the like are arranged. Such concrete protection walls are for example in DE 10 145 647 and DE 10 2005 030 412 described.

Water can penetrate, for example due to cracks in the concrete or at joints. This leads to corrosion of the rebar, so that the required stability and retention level of the concrete barrier are no longer guaranteed. This problem exists in particular due to the required long-term reliability of such concrete guide walls, in particular more than 20 years.

Such concrete guide walls are made, for example, as cast-in-place baffles. For this purpose, usually the first several Reinforcement elements, for example, arranged on or next to the roadway. The individual longitudinally adjoining reinforcing elements overlap one another and are usually connected to one another by welding. The production of concrete concrete wall, within which the reinforcing elements are arranged, is done by machine as a local concrete baffle. Here, the reinforcing elements are lifted by the machine to be brought into the exact later horizontal and vertical position. Subsequently, the concrete wall is made by casting by means of concrete. Since, on the one hand, shrinkage occurs during curing of the concrete and, on the other hand, temperature fluctuations have to be taken into account, joints are provided during the manufacturing process of the concrete guide wall. Such joints are usually provided at a distance of four to six meters. These joints must be filled after curing of the concrete, for example, with silicone. Despite such elastic filling of the joints leaks may occur especially after several years, leading to the ingress of water and thus to corrosion of the reinforcing elements.

To reduce the risk of corrosion, it is known to galvanize the reinforcing bars. However, because of the concrete that surrounds the reinforcing steels directly, but there is an alkaline milieu, corrosion can still occur, so that the required longevity can not be guaranteed even with such Betonleitwänden with galvanized reinforcing bars.

Furthermore, it is off US 5,685,665 known to arrange reinforcing elements of a composite of several parts concrete protective wall within a plastic tube. At the in US 5,685,665 described concrete guide wall, the reinforcing elements are biased. This is quite possible due to the plastic tube within which the reinforcement element can be moved. However, this is another type of Betonleitwand because a connection between the concrete and the reinforcement element does not occur. Furthermore, there is already the risk of the penetration of water into the plastic pipe during assembly, which can then not evaporate again, so that in the plastic pipe, a corrosion even accelerating environment can form. This construction is therefore not suitable for preventing corrosion of the reinforcement.

The object of the invention is to provide a concrete barrier to the road boundary and a method for producing a Betonleitwand having a long life.

The object is achieved according to the invention by the features of claim 1 for a concrete guide wall or by the features of claim 9 for producing a concrete guide wall.

The concrete guide wall according to the invention for roadway boundary, which is made in particular as a local concrete guide wall, has a longitudinally extending concrete body. Within the concrete body at least one, usually a plurality of reinforcing elements is arranged. The reinforcing elements are usually steel cables, which may be made of several steel strands. The reinforcing elements usually run in the longitudinal direction of the concrete body and are usually not biased, so that in particular a connection between the reinforcing element and the concrete takes place. The concrete body has several, in particular provided at a distance of four to six meters provided joints. In this respect, the concrete body is composed of several concrete elements separated by joints.

In particular, in order to reduce the penetration of water and the risk of corrosion of the at least one reinforcing element in the joints, the at least one reinforcing element is encased in the joints. For this purpose, preferably in each case a plastic sheath in Area of individual joints provided. The plastic casing preferably lies directly against the reinforcing element, in particular no gap is provided between the plastic casing and the reinforcing element, so that the plastic casing bears against the reinforcement directly, in particular without a gap. For example, the plastic sheath may be plastic applied directly to the reinforcement, for example sprayed on.

It is particularly preferred to use a tubular plastic jacket, in particular a shrink sleeve, i. to provide a hose that contracts when exposed to heat.

By providing a sheath designed in particular as a shrink tubing in the region of joints between concrete elements of the concrete body of the concrete guide wall, the risk of corrosion can also be reduced, in particular completely avoided, when water penetrates into these joints. Furthermore, the provision of such plastic sheaths has the advantage that the risk of cracking is reduced. Such cracks occur in particular in the production of the local concrete guide wall due to the shrinkage process of the concrete. By providing the plastic sheathing in the area of the joints, the bond between the concrete and the reinforcement is lower, so that the risk of cracking during shrinkage is reduced.

The plastic sheaths, which are in particular designed as heat-shrinkable tubes, preferably have a length of 20 cm to 80 cm, in particular 40 cm to 70 cm and particularly preferably 50 cm to 70 cm. Depending on the distance between the joints, the reinforcing elements are sheathed over a length of 10% to 30% of the total length, in particular 10% to 20% and particularly preferably 10% to 15% with a plastic casing, in particular in the form of a heat-shrinkable tube. Here, the joint is made in the State of the concrete guide wall preferably arranged approximately in the middle of the plastic casing, so that each protrudes about half into two adjacent concrete elements.

It is particularly preferred that the sheathing is a plastic sheath. This has the particular advantage that it can be produced in a simple manner. Furthermore, it is preferred that the plastic coating comprises polyolefins, in particular polypropylenes, polyethylenes, mixtures thereof or copolymers.

The at least one reinforcing element may be a reinforcing element having a plurality of strands. The plurality of strands are connected by twisting, braiding or the like to a reinforcing element, for example.

The reinforcing elements, in particular having a plurality of strands, preferably comprise steel and, in a particularly preferred embodiment, are made of structural steel.

Furthermore, the invention relates to a method for producing a concrete guide wall for road boundary, wherein in particular the concrete guide wall described above is produced in the preferred embodiments.

To produce the concrete guide wall, at least one reinforcing element is initially arranged in an installed position. For this purpose, the at least one reinforcing element is arranged, for example, on the road surface or next to the road surface in the position in which later the concrete wall is located. During the concreting of the concrete diaphragm baffle, the usually several reinforcing elements are raised so that they are in a horizontal and a vertical final installation position. The first lying on the road or next to the road Usually several reinforcing elements usually have a length of several meters, wherein the longitudinally adjacent reinforcing elements can be arranged overlapping and joined together by welding.

In a further step, plastic sheathings are arranged on the at least one reinforcing element in the region of the joints to be produced later. This is done with long composite reinforcement elements in particular before assembly or welding of the reinforcing elements. The plastic sheathings may be, for example, windings of the individual regions with a band-shaped plastic material such as an adhesive tape. Preference is given to the provision of tubular sleeves which are inserted over the at least one reinforcing element, wherein the tubular sleeves are in particular heat shrink tubing. It is particularly preferred that a gap-free connection between the plastic casing and the reinforcing element is produced by the plastic casing.

Subsequently, the local concrete guide wall is produced by casting, wherein the joints are produced during or immediately after the casting process.

Since the plastic sheaths are preferably heat-shrinkable hoses, it is further preferred to fix the plastic sheathings, in particular by heating, to the reinforcing elements.

Preferably, the method, as described above with reference to the concrete guide according to the invention, according to the invention further developed.

Grouting or closing the joints, in particular with silicone, may be omitted in the case of the concrete guide wall according to the invention, since the penetration of moisture no longer causes any damage to the reinforcing elements.

The invention will be explained in more detail with reference to a preferred embodiment with reference to the accompanying drawings.

Fig. 1

eine schematische Seitenansicht eines Abschnitts einer Betonleitwand,

Fig. 2

eine schematische Schnittansicht entlang der Linie II-II in Fig. 1,

Fig. 3

eine schematische Vergrößerung eines mit einem Schrumpfschlauch ummantelten Bewehrungselements vor dem Erwärmen des Schrumpfschlauchs und

Fig. 4

den in Fig. 3 dargestellten, mit dem Schrumpfschlauch ummantelten Bereich des Bewehrungselements nach dem Erwärmen des Schrumpfschlauchs.

Show it:

Fig. 1

a schematic side view of a portion of a concrete guide wall,

Fig. 2

a schematic sectional view taken along the line II-II in Fig. 1 .

Fig. 3

a schematic enlargement of a sheathed with a heat shrink tubing element before heating the shrink tubing and

Fig. 4

the in Fig. 3 represented, coated with the shrink tubing portion of the reinforcing element after heating the shrink tube.

A concrete guide wall 10, which is produced as a stationary concrete guide wall, has a plurality of concrete elements 12 arranged one behind the other in the longitudinal direction. The concrete elements 12 are each separated by a joint 14 from each other. In the illustrated embodiment, three reinforcing elements 16, designed in particular as steel cables, extend in the longitudinal direction of the concrete guide wall. These have, for example, a length of approximately twelve meters, so that the longitudinally adjoining reinforcing elements 16 partially overlap and are connected to one another by a weld 18.

In the illustrated embodiment, the three reinforcing elements 16 are arranged in the upper region of the concrete guide wall 10, wherein it is of course also possible to provide in the foot region in particular horizontally arranged side by side reinforcing elements.

In the area of the joints 14, the reinforcing elements 16 are surrounded by sheaths 20. In the preferred embodiment, the casings 20 are heat-shrinkable tubing having a length of 40 to 100 cm, wherein the joints 14 are each arranged approximately in the middle.

The sleeve-like heat shrink tubing 20 are pushed in particular before joining mutually adjacent reinforcing elements 16 by welds 18 on the individual reinforcing elements 16 and in the corresponding areas, in which joints are provided after producing the local concrete baffle 14, connected to the reinforcing elements 16. When providing shrink tubing 20, a simple connection or fixing of the shrink tubing 20 in the corresponding areas of the reinforcing elements 16 can be carried out by heating. This results in a contraction or shrinkage of the shrink tube 20, as shown schematically in FIG Fig. 4 shown. Of course, other connection options such as gluing or the like are conceivable.

In the illustrated embodiment, the individual reinforcing elements 16 strands 22, which are, for example, twisted against each other.

Claims (11)

Concrete guide wall for road boundary, with
one, a plurality of concrete elements (12) having concrete body (10), wherein between the concrete elements (12) joints (14) are provided, and
at least one reinforcing element (16) arranged within the concrete body (10),
characterized in that
the at least one reinforcing element (16) is encased in the region of the joints (14). Concrete guide wall according to claim 1, characterized in that the at least one reinforcing element (16) in the region of the joints (14) each having a plastic sheath (20). Concrete guide wall according to claim 2, characterized in that the plastic coating comprises polyolefins, in particular polypropylenes, polyethylenes, mixtures thereof or copolymers. Concrete guide wall according to claim 2 or 3, characterized in that the plastic casing (20) is tubular and is in particular designed as a shrink tube. Concrete guide wall according to one of claims 2 to 4, characterized indicates that the plastic casing (20) the Reinforcement element (16) on a length of 20 cm to 80 cm, in particular 40 cm to 70 cm and particularly preferably 50 cm to 70 cm surrounds. Concrete guide wall according to one of claims 1 to 5, characterized indicates that several, in particular all a reinforcing element (16) forming strands (22) have a common sheath (20). Concrete guide wall according to one of claims 1 to 6, characterized in that the reinforcing element (16) comprises steel. Concrete guide wall according to one of claims 1 to 7, characterized in that the concrete body (10) is designed as a local concrete guide wall. Method for producing a concrete guide wall for the roadway boundary, in particular a concrete guide wall according to one of claims 1 to 8, with the steps: Arranging at least one reinforcing element (16) in an installed position, Arranging plastic sheathing (20) on the at least one reinforcing element (16) in areas where joints (14) are made, and Pouring the concrete protective wall (10) as a local concrete guide wall to produce joints (14). The method of claim 9, wherein the plastic sheaths (20) are fitted onto the at least one reinforcing element (16). The method of claim 9 or 10, wherein the plastic sheaths (20) for fixing to the at least one reinforcing element (16) are heated.

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