DE102009026005A1 - Bridge lining renewal method, involves roughening concrete layer by high-pressure water jet or by fine milling, applying mat reinforcement on roughened concrete layer, and applying new pavement on bridge - Google Patents

Abstract

The method involves removing an existing covering and/or an existing lining applied on a concrete layer (4). The concrete layer is roughened by a high-pressure water jet or by fine milling, and a mat reinforcement (3) is applied on the roughened concrete layer, where an adhesive strength of about 2 Newton per square mm is produced between the mat reinforcement and the mat reinforcement by roughening the concrete layer. A new pavement (2) is applied on the bridge, where the mat reinforcement is applied on the roughened concrete layer without a primer.

Description

The The invention relates to a method for renewing a coating an existing bridge.

Out In practice, it is known in renewing a coating on an existing bridge the Old flooring as well as the old seal up to an existing layer to remove from old concrete.

Subsequently, will in practice, a mesh reinforcement arranged on the layer of old concrete. These Mesh reinforcement must be fixed. Regulation are in Germany currently eight dowels per square meter for fixing this net reinforcement.

Since a bridge usually has a very large bridge area, a plurality of dowels is to be arranged at eight dowels per square meter. In a 500 m long bridge, which is 15 m wide, you get an area of 7,500.00 m ² . With eight anchors per square meter, 60,000 dowels have to be inserted. This means that a hole has to be drilled for each dowel and then cleaned again after drilling. Then the dowel has to be inserted.

In order to This method known from practice is extremely complex and so expensive.

The The problem underlying the invention is a method to indicate renewal of a deposit on an existing bridge, which cost feasible is.

This technical problem is solved by a method having the features according to claim 1 solved.

• a) Entfernen eines Altbelages und/oder einer alten Abdichtung bis zu einer Schicht aus Altbeton,
• b) Aufrauen der Schicht aus Altbeton mittels Wasserstrahlung und/oder Feinfräsung,
• c) Anordnen einer Netzbewehrung auf der aufgerauten Schicht aus Altbeton,
• d) Aufbringen eines neuen Fahrbahnbelages.

The inventive method for renewing a coating on an existing bridge comprises the following method steps:

• a) removal of an old lining and / or an old seal up to a layer of old concrete,
• b) roughening the layer of old concrete by means of water radiation and / or fine milling,
• c) placing a mesh reinforcement on the roughened layer of old concrete,
• d) Applying a new road surface.

In addition, can also a leveling of the surface can be performed.

Thereby, that the layer of old concrete, that is, the concrete of the superstructure is removed and in that then the surface water blasted is, the old concrete is roughened.

By the roughening is no longer necessary to a primer use to place a net reinforcement on the old concrete. The Adjustment of the mesh reinforcement with eight anchors per square meter is also omitted.

With the method according to the invention it is sufficient to use a maximum of two dowels per square meter. In most cases even becomes a dowel rich or it is at all no dowels or for example only one dowel per two square meters required.

According to a particularly preferred embodiment of the invention, an adhesive tensile strength of at least 2 N / mm ^{2 is} produced by the roughening of the layer of old concrete between the mesh reinforcement and the layer of old concrete. This ensures that the small number of dowels sufficient.

By the roughening of the layer of old concrete is also possible on to dispense with the previously used primer, which is also a Further cost savings and labor savings, namely the Time required to apply the primer brings.

in the Framework of the method according to the invention is it according to one another embodiment of the Invention possible, compensate for a structural gradient (level) for road surfaces. It is possible, too, a change of one Transverse or longitudinal inclination perform. About that In addition, according to other embodiments the invention a gain of roadway plates, in particular of orthotropic roadway plates carried out become.

Further Features and advantages of the invention will become apparent from the accompanying drawings, in the several embodiments a renewed coating are shown only by way of example. In the drawing demonstrate:

1 a cross section through a structure (bridge) with renewed coating;

2 a cross section through a structure.

1 shows a structure 1 in the form of a bridge. On the bridge is a layer 2 arranged, which consists of a reinforced sealing, wear and reinforcing concrete. The reinforcement is with 3 characterized. The layer 2 , that is, the structural reinforcement and the wear concrete have been produced in one operation. This is the old concrete of the structure 1 roughened by water jets, so that in one operation, the structural reinforcement and the wear concrete could be applied.

When repairing the bridge according to 2 becomes the surface of the old concrete 4 of the structure 1 milled about five centimeters. Subsequently, a high pressure water jets. This is followed by a recording of the level and ceiling calculation. Subsequently, a layer 2 with an attached reinforcement 3 on the processed old concrete 4 arranged. Thereafter, a new concrete in the form of the layer 5 applied.

Finished parts can be found in the edge area of the structure 6 be arranged from steel, fiber concrete or the like.

In 2 are exemplary dowels 7 for fixing the net reinforcement 3 shown, and a maximum of two dowels 7 per square meter.

1

Structure

2

layer made of reinforced sealing, wear and reinforcing concrete

3

reinforcement

4

layer made of old concrete

5

new topping

6

precast made of steel, fiber concrete or similar

7

dowel

Claims (8)

Method of renewing a coating on an existing bridge ( 1 ) with the following process steps: a) removal of an old covering and / or an old seal up to a layer ( 4 ) of old concrete, b) roughening of the layer ( 4 ) from old concrete by means of water radiation and / or fine milling, c) arranging a network reinforcement ( 3 ) on the roughened layer ( 4 ) of old concrete, d) application of a new road surface ( 2 . 5 ). Method according to claim 1, characterized in that by the roughening of the layer ( 4 ) of old concrete between the mesh reinforcement ( 3 ) and the layer ( 4 ), an adhesive tensile strength of at least 2.0 Newton per square millimeter is produced from old concrete. Method according to claim 1 or 2, characterized in that the mesh reinforcement ( 3 ) without primer on the roughened layer ( 4 ) is arranged from old concrete. Method according to one of the preceding claims, characterized in that per square meter bridge surface maximum two dowels ( 7 ) are arranged for anchoring the network reinforcement. Method according to one of the preceding claims, characterized characterized in that a compensation of a structural gradient for road surfaces carried out becomes. Method according to one of the preceding claims, characterized marked that a change a transverse and / or pitch carried out becomes. Method according to one of the preceding claims, characterized characterized in that a reinforcement carried out by road plates becomes. Method according to one of the preceding claims, characterized characterized in that a reinforcement is carried out by orthotropic carriageway panels.