Defects in track subgrade, particularly in a rail bed and railway track substructure body are detected by the radar control of subgrade, by continuously recording the permitivity of subgrade materials, while radar beams are transmitted into subgrade at least in two directions and reflected beams are received at least in two points after these beams in track subgrade have travelled different distances. The apparatus for detecting the defects contains the radar antenna system (7), carried by a railway track recording car, including the transmitting and detecting radar antennas (7a, 7b) and another detecting radar antenna (7b) for the reception of reflected signals travelling in different inclined trajectory than the reflected signals returning to the first radar antenna (7a). Radar antennas (7a, 7b) are connected with a radar control and recording unit (6) for recording a time lag between both of the reflected signals and for detecting anomalies in a rail bed and railway track substructure body.

A method of detecting defects in track subgrade and an apparatus for carrying out the method

The invention refers to a machine and a method used to level, align and stabilise the track and compact the ballast bed, producing controlled lifting, so that the load used in the settlement of the rail in its theoretical position falls within the established range, working in an uninterrupted manner. The machine is constituted by two bogies with traction capacity, and front, back and centre control cabins and a rear and frontal measuring tensioner trolleys. The machine has an additional lifting unit whose relative movement with the rest of the machine in controlled by total longitudinal cylinder. The alignment cylinders generate a transversal movement to cause track alignment. Behind this unit according to the direction of work a stabilising unit is situated which consists of two stabilising trolleys. The ground-penetrating radar is situated at the machine front.

Machine and method for railway track maintenance, for track levelling, alignment, compaction and stabilisation, capable of operating without interrupting the forward movement thereof

The system has at least one detector unit for receiving the intensity modulated output radiation reflected from the objects to be detected. An evaluation unit for processing distance measurements. At least one distance value storage (57) is provided, controlled with a pulse transmitter (31). With which a sequence of distance values can be stored. The or each distance value storage is connected to a determination unit (63,64) with which from the distance values stored in the or each distance value storage. A minimum distance value can be determined corresp. to a minimum distance.

System for non-contact detection of objects with at least one beam transmitter

The method involves scanning the line building by a measuring vehicle with a gauge device, transferring data memory captured by the gauge device to a central data memory device and determining the geographical position of the gauge device along the line building. The data with a reference data, which are in a reference database are determined with the gauge device before geological layer compositions and put down by a digital data processing. The determined geological layer compositions are compared and then assigned. An independent claim is also included for a condition detecting device for line construction.

Method and device for detecting the condition of track way

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum Erfassen des Zustands von Linienbauwerken, mit den Schritten Abtasten des Linienbauwerks mittels einer an einem Messfahrzeug befestigten Abtastvorrichtung, Ubertragen und Speichern der von der Abtastvorrichtung erfassten Daten zu bzw. in einer zentralen Datenspeichervorrichtung und Ermitteln der geographischen Position der Radarvorrichtung entlang des Linienbauwerks, und verbessert dieses Verfahren bzw. eine Vorrichtung zur Durchfuhrung dieses Verfahrens, indem die Abtastvorrichtung zumindest eine Sensorvorrichtung umfasst, die mittels einer Antennenvorrichtung mit einem elektrischen Dipol eine elektromagnetische Schwingung erzeugt und die mittels eines Hohlleiters, dessen Querschnittsflache sich quer zur Ausbreitungsrichtung der elektromagnetischen Schwingung vom Dipol zu einer Austrittsoffnung hin vergrosert, die elektromagnetische Schwingung an die Umgebungsluft koppelt.

GPS gestütztes, kontinuierliches Trassenerkundungssystem mit Multisensorik

A transmission and reception antenna of a georadar are moved continuously or discontinuously along the track at a speed of from 3 to 50 km/h. The recorded radar graph is calibrated using calibration trials. The georadar is used as an indirect method in combination with a conventional direct method to achieve comprehensive and substantially non-destructive state determination with a high geotechnical safety level. Combined transmitter/receiver antennas, one transmitter per receiver antenna, or one transmitter per several receiver antennas may be used.

Detecting the state of superstructure, foundations and foundation soil of railway track

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Detecting the state of superstructure, foundations and foundation soil of railway track