Measuring device for monitoring material affecting corrosion of steel reinforcement in concrete part, has sensor arranged inside concrete part in area of steel reinforcement

[0001] The invention concerns a measuring device for the monitoring of the Stoffe.

affecting the corrosion of a Stahlarmierung in a concrete part A such measuring device is well-known from the DE 20 2006 009,541 U1. It covers a sensor anordenbaren within the concrete part within the range of the Stahlarmierung and an external electronic evaluation mechanism anordenbare outside of the concrete part. The sensor exhibits a housing from an electrically not leading material, on whose housing wall outer-laterally a sensor is arranged, which consists of a material, which corresponds to the corrosion characteristics of the Stahlarmierung. The sensor is connected with an electronic mechanism arranged in the housing, which determines the corrosion condition of the sensor in temporal distances given in advance and which measured values with the help of Sendeund receipt mechanism wirelessly to the external electronic evaluation mechanism übermittelt.

It is unfavorable during this well-known measuring device that a corrosion already entered, but made no forecast about the process or the speed of the corrosion is only determined kann.

From the DE 3,834,624 A1 likewise a measuring device is well-known for the monitoring of the materials affecting the corrosion of a Stahlarmierung in a concrete part, with which the sensor essentially consists of two sensors (electrodes), from each other arranged in the distance. A sensor of normal reinforcing steels and a sensor consist of a nobler metal, which is protected against corrosion also in a karbonisierten or chloridhaltigen concrete. These sensors are connected by electrical feeder lines with the evaluation mechanism anordenbaren outside of the concrete part, those the occurrence itself of an electric current training between the sensors with beginning of corrosion of the reinforcing steel electrode erfasst.

In order to determine the progressive process of the corrosion front more exactly, in this block letters is suggested measuring the corrosion intensity in different depths of the concrete layer whereby in different depths several beabstandete from each other, made of reinforcing steels existing sensors are arranged, which the surface arranged sensors made of nobler metal, close over conductions with one, electrically connected sind.

Thus electro-chemical tension elements in different depths are formed, so that with beginning of corrosion of the respective sensor the river training consisting of reinforcing steels between the sensors itself ändert.

Unfavorably during this well-known measuring device it is among other things that the holding wires must be led out from the concrete layer and that the measured values are not only dependent on the pollutants in the concrete, but likewise by the density of the concrete at the measuring points as well as by the temperature, from there during the evaluation of the measured values to be considered müssen.

On the basis of the DE 20 2006 009,541 U1 the invention the task is the basis to be indicated one simply and sturdily developed measuring device be won as reliable measured values about a corrosion process within a concrete part provided with a Stahlarmierung können.

This task is solved according to invention by the characteristics of the requirement 1. Further one, particularly favourable arrangements of the invention reveal the Unteransprüche.

The invention it is been based essentially on the thought that on the exterior of the housing wall of the sensor at least two axially from each other beabstandete, loop-shaped around the housing wrapped drahtförmige sensors arranged, which exhibit a different distance from that to Stahlarmierung which can be supervised, so that the course of the corrosion of the external electronic evaluation mechanism, progressing in the direction of the Stahlarmierung, determinable ist.

Preferably thereby its own electronic mechanism is assigned to each of the two sensors in the housing of the sensor for example consisting of plastic, which in each case with the external electronic evaluation mechanism wirelessly in connection steht.

The respective electronic mechanism is favourable-proves in such a manner developed that with reaching a given limit value of the corrosion of the respective sensor assigned electronic mechanism sends a signal to this sensor to the external evaluation mechanism. It can be planned that the limit value defines by the destruction of the respective sensor by corrosion wird.

The sensor should preferably consist of a material, that the corrosion characteristics of the Stahlarmierung in the respective pollutant environment entspricht.

During the external electronic evaluation mechanism it can itself around a handhold reader or around a measuring station handeln.

In addition the external electronic evaluation mechanism and the electronic mechanisms of the sensor can co-operate in such a manner that the corrosion condition of the sensor in given time intervals conveys by means of a telemetry signal called up and to a measuring station wird.

Further details and advantages of the invention result from the following, on the basis a figure described Ausführungsbeispiel.

CH699695A2 in the figure is marked with 1 a measuring device according to invention, which serves the corrosion of a Stahlarmierung 2 in a concrete part 3 for the monitoring. The measuring device 1 covers within the concrete part 3 a sensor 4 and an external electronic evaluation mechanism 5. in the remark example, represented arranged within the range of the Stahlarmierung 2, anordenbare outside of the concrete part 3, in the figure acts it during the external evaluation mechanism 5 around a handhold reader, which the determined corrosion values on a screen darstellt.

The sensor 4 covers from an electrically not leading material, e.g. plastic, existing cylindric housing 6, which fastens with its lower face 7 to reinforcing 2 by means of wire-clammy 7 ' ist.

On the exterior of the housing wall 8 of the sensor 4 two are axially from each other beabstandete, loop-shaped around the housing 6 wrapped drahtförmige sensors 9, 9 ' arranged, which exhibit a different distance of the Stahlarmierung 2 which can be supervised, so that the course of the corrosion of the external electronic evaluation mechanism 5, progressing in the direction of the Stahlarmierung 2, determinable ist.

The two sensors 9, 9 consist ' of a material, that the corrosion characteristics of the Stahlarmierung 2 in the respective pollutant environment entspricht.

In addition to everyone of the two sensors 9, 9 ' its own electronic mechanism is assigned 10, 10 ' in the housing 6 of the sensor 4, which with the external electronic evaluation mechanism 5 wirelessly in connection steht.

The two electronic mechanisms 10, 10 are in such a manner developed ' that during destruction of the respective sensor 9, 9 ' by corrosion this sensor 9, 9 ' assigned electronic mechanism 10.10 ' a signal to the external evaluation mechanism 5 sendet.

Reference symbol list 1 measuring device 2 Stahlarmierung 3 concrete part 4 sensor (external) evaluation mechanism of 6 housings 7 face 7 ' Drahtklammer 8 housing wall of 9.9 ' sensors 10.10 ' electronic mechanism