| abstract |
The invention relates to a device 7 for determining the state of the superstructure 3 of railways, roads and / or earth layers. The device comprises a tube 9, 9 'and a propulsion and lifting device 8 for selectively propel the pipe 9, 9' in the superstructure 3 or the soil or lifting the tube 9, 9 'from the superstructure 3 or the soil. The tube 9, 9 'has a downwardly directed, in particular pointed, lower end section 10, which is directed downwards during the advancement or lifting, and above which a sensor unit 11, 19 is arranged. The invention further relates to a method for determining the condition of the superstructure 3 of railways or roads or earth layers by means of such a device. |