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GB2429783A - Stress free temperature variation monitor for railway tracks - Google Patents

Stress free temperature variation monitor for railway tracks Download PDF

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Publication number
GB2429783A
GB2429783A GB0518049A GB0518049A GB2429783A GB 2429783 A GB2429783 A GB 2429783A GB 0518049 A GB0518049 A GB 0518049A GB 0518049 A GB0518049 A GB 0518049A GB 2429783 A GB2429783 A GB 2429783A
Authority
GB
United Kingdom
Prior art keywords
rail
stress
stress free
free temperature
temperature variation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB0518049A
Other versions
GB0518049D0 (en
Inventor
Brian Gibbens
Keith Huxley
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB0518049A priority Critical patent/GB2429783A/en
Publication of GB0518049D0 publication Critical patent/GB0518049D0/en
Publication of GB2429783A publication Critical patent/GB2429783A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61K—AUXILIARY EQUIPMENT SPECIALLY ADAPTED FOR RAILWAYS, NOT OTHERWISE PROVIDED FOR
    • B61K9/00—Railway vehicle profile gauges; Detecting or indicating overheating of components; Apparatus on locomotives or cars to indicate bad track sections; General design of track recording vehicles
    • B61K9/08—Measuring installations for surveying permanent way
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61K—AUXILIARY EQUIPMENT SPECIALLY ADAPTED FOR RAILWAYS, NOT OTHERWISE PROVIDED FOR
    • B61K9/00—Railway vehicle profile gauges; Detecting or indicating overheating of components; Apparatus on locomotives or cars to indicate bad track sections; General design of track recording vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L1/00—Devices along the route controlled by interaction with the vehicle or train
    • B61L1/02—Electric devices associated with track, e.g. rail contacts
    • B61L1/06—Electric devices associated with track, e.g. rail contacts actuated by deformation of rail; actuated by vibration in rail
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
    • G01B11/026—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness by measuring distance between sensor and object
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
    • G01S1/70—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using electromagnetic waves other than radio waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/88—Lidar systems specially adapted for specific applications

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Automation & Control Theory (AREA)
  • Machines For Laying And Maintaining Railways (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

A measuring and monitoring device, which is fitted as a temporary or permanent fixture on to continuous welded rails. The device measures the linear expansion or contraction in the rail and compares the movement to a calibrated length. This process enables the rail stress and the Stress Free Temperature to be calculated. The main embodiment consists of a laser range finder and a reflector placed at two separate points along the rail. Distance is measured and the stress state is calculated.

Description

PAGE (1) I. TITLE Stress Free Temperature Variation Monitor
2. BACKGROUND
When continuously welded rails are installed on the rail network, they are stretched to a length, before welding, which they would be if the temperature were 27 degrees C. Thus the rails are always in tension provided that the rail temperature does not exceed 27 degrees C. If the latter temperature exceeds 27 degrees C then the rails, pass the stress free point and go into compression, and ultimately a buckle situation will occur. Once a rail is installed with an SFT of 27 degrees C., the tension in the rail will fall with the passage of time, and other influences. Thus the SFT will fall, reducing the stability in the rail.
Both events described will create dangerous conditions for rail traffic, and Rail Engineers are always keen to know what the stress free temperature of any rail is to ensure safe running of trains.
3. STATEMENT OF INVENTION
To overcome the above problems, the present invention proposes to monitor the amount of linear expansion or contraction in the rail, by using a laser range finder, or other measuring device. The changes in rail length can be measured accurately and compared with the original calibration length taken, which was recorded at a known temperature on installation. The change in length caused by changes in temperature will enable the rail stress & S.F.T. to be calculated.
PAGE (2) 4. ADVANTAGES The holes in the rail, which are required for mounting the measuring equipment, can be put in the rail during manufacture, during installation, or after installation. The equipment can be installed and left to monitor SFT permanently, or SFT checks can be made on any time intervals deemed necessary by engineers without disrupting trains, or requiring a full possession.
5. EXAMPLE
An example of the invention will now be described by referring to the accompanying drawing.
Figure 1. shows a typical installation
6. DESCRIPTiON
The first procedure is to drill two precision holes in a rail at a given distance apart when the rail is at constant temperature. The rail temperatures are measured by using temperature sensors inserted part way through each hole in the web of the rail. On the opposite side of each hole a steel pin is inserted.
One pin carries a reflector plate, whose surface is exactly on the centre line of the pin.
The second pin carries plates, which support a laser range finder head, which measures the exact distance between the centres of each pin in the rail. The distance between the two pins, at constant temperature are recorded in a data logger. As rail temperatures change the rail will expand or contract, thus enabling the change in distance between the pins to be measured. By knowing the co efficient of linear expansion, the rail temperature and length and the PAGE (3) change in distance between the pins, the stress free temperature, and stress levels in the rail can be calculated, automatically and displayed. The laser equipment can be mounted vertically above the rail as in figure 1, or it can be mounted horizontally, i.e. at 90 degrees to the rail, which would allow the passage of trains during monitoring. Information from the laser range finder may be retrieved through a hand held data logger and computer, or it can be fed by cable to a lineside box, for constant monitoring and transmission back to a nominated signal box or control room, via an auto dial telemetry link.

Claims (1)

  1. PAGE (4)
    We claim the Patent Rights to the principle of measuring the variations in expansion and contraction of welded rails (however this may be measured) to determine the stress in the rails and the Stress Free Temperature.
GB0518049A 2005-09-06 2005-09-06 Stress free temperature variation monitor for railway tracks Withdrawn GB2429783A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0518049A GB2429783A (en) 2005-09-06 2005-09-06 Stress free temperature variation monitor for railway tracks

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0518049A GB2429783A (en) 2005-09-06 2005-09-06 Stress free temperature variation monitor for railway tracks

Publications (2)

Publication Number Publication Date
GB0518049D0 GB0518049D0 (en) 2005-10-12
GB2429783A true GB2429783A (en) 2007-03-07

Family

ID=35220880

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0518049A Withdrawn GB2429783A (en) 2005-09-06 2005-09-06 Stress free temperature variation monitor for railway tracks

Country Status (1)

Country Link
GB (1) GB2429783A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103043079A (en) * 2012-12-21 2013-04-17 江苏睿励信息科技研究院有限公司 Online stress and temperature monitoring system of chain-net type seamless steel rail
CN104176091A (en) * 2014-08-28 2014-12-03 华东交通大学 Real-time continuous welded rail temperature and temperature stress monitoring system
CN104596426A (en) * 2015-01-19 2015-05-06 内蒙古包钢钢联股份有限公司 Bridge crane span measuring device
CN105182354A (en) * 2015-07-16 2015-12-23 山东钢铁股份有限公司 Continuously-casted slab measuring device and use method thereof
US20160054445A1 (en) * 2013-01-25 2016-02-25 The Chugoku Electric Power Co., Inc. Distance measurement system and distance measurement method
CN105784269A (en) * 2016-04-21 2016-07-20 温州大学 Laser ultrasonic method-based steel rail temperature stress calibration platform
EP3118647A1 (en) * 2014-03-12 2017-01-18 The Chugoku Electric Power Co., Inc. Distance measuring apparatus and distance measuring method
CN108423031A (en) * 2018-03-27 2018-08-21 株洲时代电子技术有限公司 A kind of gapless track microdisplacement measurement method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115839668B (en) * 2023-02-16 2023-04-25 山西仲测计量研究院有限公司 Mechanical part hole spacing measuring device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1518359A (en) * 1977-02-02 1978-07-19 Strainstall Ltd Force measurement
US4526039A (en) * 1983-06-23 1985-07-02 The United States Of America As Represented By The Secretary Of Transportation Removable strain gauge fixture and method for measuring accumulated strain in a material
WO1994020847A1 (en) * 1993-03-03 1994-09-15 Herzog Contracting Corp. Dynamic rail longitudinal stress measuring system
JP2001108414A (en) * 1999-10-14 2001-04-20 Nagoya Railroad Co Ltd Rail variation quantity measuring method and its measuring instrument
GB2362471A (en) * 2000-01-19 2001-11-21 James Eric Turner Rail stress measurement
WO2004077003A1 (en) * 2003-02-25 2004-09-10 Aea Technology Plc Measurement of residual and thermally-induced stress in a rail

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1518359A (en) * 1977-02-02 1978-07-19 Strainstall Ltd Force measurement
US4526039A (en) * 1983-06-23 1985-07-02 The United States Of America As Represented By The Secretary Of Transportation Removable strain gauge fixture and method for measuring accumulated strain in a material
WO1994020847A1 (en) * 1993-03-03 1994-09-15 Herzog Contracting Corp. Dynamic rail longitudinal stress measuring system
JP2001108414A (en) * 1999-10-14 2001-04-20 Nagoya Railroad Co Ltd Rail variation quantity measuring method and its measuring instrument
GB2362471A (en) * 2000-01-19 2001-11-21 James Eric Turner Rail stress measurement
WO2004077003A1 (en) * 2003-02-25 2004-09-10 Aea Technology Plc Measurement of residual and thermally-induced stress in a rail

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103043079A (en) * 2012-12-21 2013-04-17 江苏睿励信息科技研究院有限公司 Online stress and temperature monitoring system of chain-net type seamless steel rail
US20160054445A1 (en) * 2013-01-25 2016-02-25 The Chugoku Electric Power Co., Inc. Distance measurement system and distance measurement method
EP2950041A4 (en) * 2013-01-25 2016-10-19 Chugoku Electric Power Distance measurement system and distance measurement method
US9766058B2 (en) * 2013-01-25 2017-09-19 The Chugoku Electric Power Co., Inc. Distance measurement system and distance measurement method
EP3118647A1 (en) * 2014-03-12 2017-01-18 The Chugoku Electric Power Co., Inc. Distance measuring apparatus and distance measuring method
EP3118647A4 (en) * 2014-03-12 2017-03-29 The Chugoku Electric Power Co., Inc. Distance measuring apparatus and distance measuring method
CN104176091A (en) * 2014-08-28 2014-12-03 华东交通大学 Real-time continuous welded rail temperature and temperature stress monitoring system
CN104596426A (en) * 2015-01-19 2015-05-06 内蒙古包钢钢联股份有限公司 Bridge crane span measuring device
CN105182354A (en) * 2015-07-16 2015-12-23 山东钢铁股份有限公司 Continuously-casted slab measuring device and use method thereof
CN105784269A (en) * 2016-04-21 2016-07-20 温州大学 Laser ultrasonic method-based steel rail temperature stress calibration platform
CN105784269B (en) * 2016-04-21 2018-08-28 温州大学 Railroad's Temperature Stress calibrating platform based on laser-ultrasound method
CN108423031A (en) * 2018-03-27 2018-08-21 株洲时代电子技术有限公司 A kind of gapless track microdisplacement measurement method

Also Published As

Publication number Publication date
GB0518049D0 (en) 2005-10-12

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Legal Events

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)