WO2007073114A1 - Apparatus and sensor for measuring strain of underground pipe - Google Patents

Apparatus and sensor for measuring strain of underground pipe Download PDF

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Publication number
WO2007073114A1
WO2007073114A1 PCT/KR2006/005652 KR2006005652W WO2007073114A1 WO 2007073114 A1 WO2007073114 A1 WO 2007073114A1 KR 2006005652 W KR2006005652 W KR 2006005652W WO 2007073114 A1 WO2007073114 A1 WO 2007073114A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical fiber
measuring
measuring optical
underground pipe
temperature
Prior art date
Application number
PCT/KR2006/005652
Other languages
French (fr)
Inventor
Ki-Tae Chang
Original Assignee
Gmg Co., Ltd.
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
Priority claimed from KR1020050128229A external-priority patent/KR100764932B1/en
Priority claimed from KR1020050128220A external-priority patent/KR100764931B1/en
Application filed by Gmg Co., Ltd. filed Critical Gmg Co., Ltd.
Publication of WO2007073114A1 publication Critical patent/WO2007073114A1/en

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Classifications

    • 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
    • G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
    • G01B11/18—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge using photoelastic elements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
    • G01D5/3537—Optical fibre sensor using a particular arrangement of the optical fibre itself
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
    • G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/08—Testing mechanical properties
    • G01M11/083—Testing mechanical properties by using an optical fiber in contact with the device under test [DUT]
    • G01M11/086—Details about the embedment of the optical fiber within the DUT
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
    • G01D3/028—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure
    • G01D3/036—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure on measuring arrangements themselves
    • G01D3/0365—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure on measuring arrangements themselves the undesired influence being measured using a separate sensor, which produces an influence related signal

Definitions

  • the present invention relates to an underground pipe deformation measuring apparatus, a method of installing and using the same, and a measuring sensor used in the same, and, more particularly, to an underground pipe deformation measuring apparatus that is capable of quickly measuring the deformation of an underground pipe on the ground without damaging the underground pipe, a method of installing and using the same, and a measuring sensor used in the same.
  • underground pipes are pipes used to deliver fluids.
  • Underground pipes are classified depending upon kinds of used fluids they carry.
  • underground pipes may be classified into commercial pipes such as water supply and drainage pipes related to living, and industrial pipes such as oil pipes used to deliver petroleum, industry-related pipes, and chemical substance delivery pipes.
  • the conventional measuring method is characterized in that an optical fiber, which exhibits the change of transmitted light depending upon the deformation of a pipe, is integrally attached to the pipe over the total length of the pipe along regions where the optical fiber is not in contact with fluid flowing through the pipe, and light passing through the optical fiber is reflected from the end point of the optical fiber. Consequently, the conventional measuring method is capable of measuring the deformation amount of the pipe based on the reflected light.
  • the conventional measuring apparatus includes an optical fiber integrally attached to a pipe over the total length of the pipe along regions where the optical fiber is not in contact with fluid flowing through the pipe, the optical fiber reflecting light from the end point thereof, a light source generator for irradiating light to the start point of the optical fiber, and a measuring unit for receiving light reflected from the end point of the optical fiber. Consequently, the conventional measuring apparatus is capable of measuring the deformation amount of the pipe based on the reflected light.
  • the present invention has been made in view of the above problems, and it is an object of the present invention to provide an underground pipe deformation measuring apparatus that is capable of quickly analyzing the deformation of the underground pipe and the leakage from the underground pipe on the ground without damaging the outer portion of the underground pipe through the use of a measuring sensor disposed below the underground pipe for measuring the deformation and the temperature of the underground pipe, thereby taking a step for preventing the damage to the underground pipe, and a measuring sensor used in the same . It is another object of the present invention to provide an underground pipe deformation measuring apparatus that is capable of accurately analyzing the deformation of the underground pipe and the leakage from the underground pipe by sections, and a measuring sensor used in the same.
  • an underground pipe deformation measuring apparatus comprising: a measuring sensor including at least one displacement measuring optical fiber and at least one temperature measuring optical fiber which are disposed below an underground pipe buried under the ground in the same direction of the underground pipe; and a measuring unit including a light source generator connected to one end of the at least one displacement measuring optical fiber and one end of the at least one temperature measuring optical fiber for irradiating light, a deformation measurement analyzer for measuring the wavelength of the light reflected from the at least one displacement measuring optical fiber in real time to analyze the change of the at least one displacement measuring optical fiber, thereby analyzing the deformation of the underground pipe, and a temperature measurement analyzer for measuring the wavelength of the light reflected from the at least one temperature measuring optical fiber in real time to analyze the change of the at least one temperature measuring optical fiber, thereby analyzing the leakage from the underground pipe.
  • a measuring sensor disposed below an underground pipe buried under the ground for measuring the deformation of the underground pipe through a measuring unit, the measuring sensor comprising: at least one displacement measuring optical fiber and at least one temperature measuring optical fiber which are disposed below the underground pipe buried under the ground in the same direction of the underground pipe; and a belt-type case having a plurality of insertion holes in which the at least one displacement measuring optical fiber and the at least one temperature measuring optical fiber are inserted.
  • FIG. 1 is a perspective view illustrating the entire construction of an underground pipe deformation measuring apparatus according to a first preferred embodiment of the present invention
  • FIG. 2 is a sectional view taken along line A-A of FIG. 1;
  • FIG. 3 is a cross-sectional view illustrating the measuring apparatus according to the first preferred embodiment of the present invention buried under the ground;
  • FIG. 4 is a sectional view taken along line B-B of FIG. 3;
  • FIG. 5 is a cross-sectional view illustrating a modification of the measuring apparatus according to the first preferred embodiment of the present invention buried under the ground;
  • FIG. 6 is a sectional view taken along line C-C of FIG. 5;
  • FIG. 7 is a perspective view illustrating the entire construction of an underground pipe deformation measuring apparatus according to a second preferred embodiment of the present invention.
  • FIG. 8 is a sectional view taken along line D-D of FIG. 7;
  • FIG. 9 is a cross-sectional view illustrating the measuring apparatus according to the second preferred embodiment of the present invention buried under the ground;
  • FIG. 10 is a sectional view taken along line E-E of FIG. 9;
  • FIG. 11 is a cross-sectional view illustrating a modification of the measuring apparatus according to the second preferred embodiment of the present invention buried under the ground;
  • FIG. 12 is a sectional view taken along line F-F of FIG. 11.
  • FIG. 1 is a perspective view illustrating the entire construction of an underground pipe deformation measuring apparatus according to a first preferred embodiment of the present invention
  • FIG. 2 is a sectional view taken along line A-A of FIG. 1
  • FIG. 3 is a cross-sectional view illustrating the measuring apparatus according to the first preferred embodiment of the present invention buried under the ground
  • FIG. 4 is a sectional view taken along line B-B of FIG. 3.
  • the underground pipe deformation measuring apparatus comprises a measuring sensor 4 including at least one displacement measuring optical fiber 41 and at least one temperature measuring optical fiber 42 which are disposed below an underground pipe 1 buried under the ground in the same direction of the underground pipe 1, and a measuring unit 3 connected to one end of the displacement measuring optical fiber 41 and one end of the temperature measuring optical fiber 42 for irradiating light to measure the wavelength of the light reflected from the displacement measuring optical fiber 41 and the temperature measuring optical fiber 42 in real time and for analyzing the change of the displacement measuring optical fiber 41 and the temperature measuring optical fiber 42 to analyze the deformation of the underground pipe 1 and the leakage from the underground pipe 1.
  • the measuring sensor 4 further includes a belt-type case 43 having a plurality of insertion holes 431 in which the displacement measuring optical fiber 41 and the temperature measuring optical fiber 42, which are disposed below the underground pipe 1 buried under the ground in the same direction of the underground pipe 1, are inserted.
  • the belt-type case 43 which constitutes the measuring sensor 4, is made of a material whose shape can be changed when the underground pipe 1 is deformed.
  • the displacement measuring optical fiber 41 and the temperature measuring optical fiber 42 are communication- purpose optical fibers constructed such that, when light is irradiated to one end of each optical fiber, the wavelength of the light is reflected from the other end of each optical fiber.
  • the measuring unit 3 includes a light source generator 31 connected to one end of the displacement measuring optical fiber 41 and one end of the temperature measuring optical fiber 42 for irradiating light, a deformation measurement analyzer 32 for measuring the wavelength of the light reflected from the displacement measuring optical fiber 41 in real time to analyze the change of the displacement measuring optical fiber 41, thereby analyzing the deformation of the underground pipe 1, and a temperature measurement analyzer 33 for measuring the wavelength of the light reflected from the temperature measuring optical fiber 42 in real time to analyze the change of the temperature measuring optical fiber 42, thereby analyzing the leakage from the underground pipe 1.
  • the measuring unit 3 is constructed such that the wavelength of the light reflected from the displacement measuring optical fiber 41 and inputted thereto is analyzed to analyze the change of the displacement measuring optical fiber 41, thereby analyzing the deformation of the underground pipe 1, and the wavelength of the light reflected from the temperature measuring optical fiber 42 and inputted thereto is analyzed to analyze the change of the temperature measuring optical fiber 42, thereby analyzing the leakage from the underground pipe 1.
  • the light source generator 31 of the measuring unit 3 is constructed to irradiate light to one end of the displacement measuring optical fiber 41 and one end of the temperature measuring optical fiber 42.
  • Several kinds of light source generators are well known.
  • the deformation measurement analyzer 32 of the measuring unit 3 analyzes the wavelength of the light reflected from the displacement measuring optical fiber 41 and inputted to the deformation measurement analyzer 32 to analyze the change of the displacement measuring optical fiber 41, thereby analyzing the deformation of the underground pipe 1. Also, the temperature measurement analyzer 33 of the measuring unit 3 analyzes the wavelength of the light reflected from the temperature measuring optical fiber 42 and inputted to the temperature measurement analyzer 33 to analyze the change of the temperature measuring optical fiber 42.
  • an underground depression in which the underground pipe 1 is to be buried is dug, and then the displacement measuring optical fiber 41 and the temperature measuring optical fiber 42 connected to the measuring unit 3 are positioned at the lower part of the underground depression, as shown in FIGS. 1 to 4. Subsequently, the underground depression is partially filled with soil such that the displacement measuring optical fiber 41 and the temperature measuring optical fiber 42 are covered with the soil, and then the underground pipe 1 is laid . on the soil covering the displacement measuring optical fiber 41 and the temperature measuring optical fiber 42, whereby the process for installing the underground pipe deformation measuring apparatus according to the present invention is completed.
  • the installed underground pipe deformation measuring apparatus is operated as follows: when the ground sinks due to external causes, and therefore, the underground pipe 1 moves downward, the displacement measuring optical fiber 41 disposed below the underground pipe 1 is deformed as shown in FIGS. 1 to 4.
  • the position of the wavelength of light reflected from the displacement measuring optical fiber 41 changes, and the position change of the wavelength of the reflected light is analyzed by the deformation measurement analyzer 32 constituting the measuring unit 3 to quickly confirm the deformation of the underground pipe 1. Consequently, it is possible to quickly confirm the deformation of the underground pipe 1 in the initial stage in which the underground pipe 1 is deformed, thereby taking a step for preventing the damage to the underground pipe 1.
  • the temperature of the temperature measuring optical fiber 42 disposed below the underground pipe 1 changes due to the leakage as shown in FIGS. 1 to 4.
  • the amplitude of the wavelength of light reflected from the temperature measuring optical fiber 42 changes, and the amplitude change of the wavelength of the reflected light is analyzed by the temperature measurement analyzer 33 constituting the measuring unit 3 to quickly confirm the leakage from the underground pipe 1.
  • FIG. 5 is a cross-sectional view illustrating a modification of the measuring apparatus according to the first preferred embodiment of the present invention buried under the ground
  • FIG. 6 is a sectional view taken along line C-C of FIG. 5.
  • the modification of the measuring apparatus according to the first preferred embodiment of the present invention includes the same components as the measuring apparatus according to the first preferred embodiment of the present invention.
  • a heating wire 35 is disposed on the belt-type case 43 above the insertion hole 431 in which the temperature measuring optical fiber 42 is inserted while the heating wire 35 is in tight contact with the belt-type case 43, and the measuring unit 3 further includes a power supply 34 for supplying power to the heating wire 35 to increase the temperature of the temperature measuring optical fiber 42.
  • the medium of the optical fiber is changed.
  • the variation width of the temperature increases.
  • the amplitude of the wavelength of the reflected light is increased.
  • the temperature of the optical fiber decreases or increases, the variation width of the temperature at the optical fiber is changed as compared to the surroundings.
  • FIG. 7 is a perspective view illustrating the entire construction of an underground pipe deformation measuring apparatus according to a second preferred embodiment of the present invention
  • FIG. 8 is a sectional view taken along line D-D of FIG. 7
  • FIG. 9 is a cross-sectional view illustrating the measuring apparatus according to the second preferred embodiment of the present invention buried under the ground
  • FIG. 10 is a sectional view taken along line E-E of FIG. 9.
  • the underground pipe deformation measuring apparatus comprises a measuring sensor 4 including at least one displacement measuring optical fiber 41 and at least one temperature measuring optical fiber 42 which are disposed below an underground pipe 1 buried under the ground in the same direction of the underground pipe 1, and a measuring unit 3 connected to one end of the displacement measuring optical fiber 41 and one end of the temperature measuring optical fiber 42 for irradiating light to measure the wavelength of the light reflected from the displacement measuring optical fiber 41 and the temperature measuring optical fiber 42 in real time and for analyzing the change of the displacement measuring optical fiber 41 and the temperature measuring optical fiber 42 to analyze the deformation of the underground pipe 1 and the leakage from the underground pipe 1.
  • the measuring sensor 4 according to the second preferred embodiment of the present invention is identical in construction to the measuring sensor 4 according to the previous embodiment of the present invention except the displacement measuring optical fiber 41 and the temperature measuring optical fiber 42.
  • the displacement measuring optical fiber 41 and the temperature measuring optical fiber 42 are distribution-type (lattice-type) optical fibers constructed such that, when a plurality of lights having different frequencies are irradiated to one end of each optical fiber, the lights are reflected by sections.
  • the measuring unit 3 includes a light source generator 31 connected to one end of the displacement measuring optical fiber 41 and one end of the temperature measuring optical fiber 42 for irradiating lights having different frequencies, a deformation measurement analyzer 32 for measuring the wavelengths of the sectional lights reflected from the displacement measuring optical fiber 41 in real time to analyze the change of the displacement measuring optical fiber 41, thereby analyzing the deformation of the underground pipe 1, and a temperature measurement analyzer 33 for measuring the wavelengths of the sectional lights reflected from the temperature measuring optical fiber 42 in real time to analyze the change of the temperature measuring optical fiber 42, thereby analyzing the leakage from the underground pipe 1.
  • the at least one displacement measuring optical fiber 41 comprises a plurality of displacement measuring optical fibers 41.
  • the measuring sensor 4 further includes a belt-type case 43 having a plurality of insertion holes 431 in which the displacement measuring optical fibers 41 and the temperature measuring optical fiber 42 are inserted.
  • the insertion holes 431 in which the displacement measuring optical fibers 41 are inserted have different diameters such that the displacement measuring optical fibers 41 can be linearly inserted in the corresponding insertion holes 431 with different lengths of the measurement sections.
  • the measuring unit 3 is constructed such that the wavelengths of the lights having different freguencies irradiated to the respective displacement measuring optical fibers 41, reflected sectionally from the respective displacement measuring optical fibers 41, and inputted thereto are analyzed to analyze the sectional change of the respective displacement measuring optical fibers 41, thereby analyzing the sectional deformation of the underground pipe 1. Also, the measuring unit 3 is constructed such that the wavelengths of the lights reflected sectionally from the at least one temperature measuring optical fiber 42 and inputted thereto are analyzed to analyze the sectional change of the temperature measuring optical fiber 42, thereby analyzing the leakage from the underground pipe 1.
  • the light source generator 31 of the measuring unit 3 is constructed to irradiate a plurality of lights having different frequencies to the respective displacement measuring optical fibers 41 and to irradiate a plurality of lights having different frequencies one end of the at least one temperature measuring optical fiber 42.
  • Several kinds of light source generators are well known.
  • the deformation measurement analyzer 32 of the measuring unit 3 analyzes the wavelengths of the lights having different frequencies reflected sectionally from the respective displacement measuring optical fibers 41 and inputted to the deformation measurement analyzer 32 to analyze the sectional change of the respective displacement measuring optical fibers 41, thereby analyzing the deformation of the underground pipe 1. Also, the temperature measurement analyzer 33 of the measuring unit 3 analyzes the wavelengths of the lights having different frequencies reflected from the at least one temperature measuring optical fiber 42 and inputted to the temperature measurement analyzer 33 to analyze the sectional change of the temperature measuring optical fiber 42.
  • a process for installing the underground pipe deformation measuring apparatus with the above-stated construction according to the second preferred embodiment of the present invention and the operation of the installed underground pipe deformation measuring apparatus will be described.
  • an underground depression in which the underground pipe 1 is to be buried is dug, and then the displacement measuring optical fibers 41 and the temperature measuring optical fiber 42 connected to the measuring unit 3 are positioned at the lower part of the underground depression, as shown in FIGS. 7 to 10. Subsequently, the underground depression is partially filled with soil such that the displacement measuring optical fibers 41 and the temperature measuring optical fiber 42 are covered with the soil, and then the underground pipe 1 is laid on the soil covering the displacement measuring optical fibers 41 and the temperature measuring optical fiber 42, whereby the process for installing the underground pipe deformation measuring apparatus according to the present invention is completed.
  • the installed underground pipe deformation measuring apparatus is operated as follows: when the ground sinks due to external causes, and therefore, the underground pipe 1 moves downward, the lattice-type displacement measuring optical fibers 41 disposed below the underground pipe 1 are deformed as shown in FIGS. 7 to 10.
  • the positions of the wavelengths of lights reflected sectionally from the displacement measuring optical fibers 41 change, and the position changes of the wavelengths of the sectionally reflected lights are analyzed by the deformation measurement analyzer 32 constituting the measuring unit 3 to quickly confirm the sectional changes of the respective displacement measuring optical fibers 41.
  • the amplitudes of the wavelengths of lights reflected sectionally from the distribution-type temperature measuring optical fiber 42 change, and the amplitude changes of the wavelengths of the reflected lights are analyzed by the temperature measurement analyzer 33 constituting the measuring unit 3 to quickly confirm the leakage from the underground pipe 1.
  • the distribution-type displacement measuring optical fiber 41 In the case of the distribution-type displacement measuring optical fiber 41 inserted in the large-diameter insertion hole 431, on the other hand, the distribution-type displacement measuring optical fiber 41 is not brought into contact with the inner surface of the insertion hole 431 when the belt-type case 43 is slightly bent. Only when the belt- type case 43 is severely bent, the distribution-type displacement measuring optical fiber 41 is deformed.
  • FIG. 11 is a cross-sectional view illustrating a modification of the measuring apparatus according to the second preferred embodiment of the present invention buried under the ground
  • FIG. 12 is a sectional view taken along line F-F of FIG. 11.
  • the modification of the measuring apparatus according to the second preferred embodiment of the present invention includes the same components as the measuring apparatus according to the second preferred embodiment of the present invention.
  • a heating wire 35 is disposed on the belt-type case 43 above the insertion hole 431 in which the at least one lattice-type temperature measuring optical fiber 42 is inserted while the heating wire 35 is in tight contact with the belt-type case 43, and the measuring unit 3 further includes a power supply 34 for supplying power to the heating wire 35 to increase the temperature of the temperature measuring optical fiber 42.
  • the medium of the optical fiber is changed.
  • the variation width of the temperature increases.
  • the amplitude of the wavelength of the reflected light is increased.
  • the temperature of the optical fiber decreases or increases, the variation width of the temperature at the optical fiber is changed as compared to the surroundings.
  • the present invention is capable of quickly analyzing the deformation of the underground pipe and the leakage from the underground pipe on the ground without damaging the outer portion of the underground pipe and thus preventing the strength of the underground pipe from decreasing. Consequently, the present invention has the effect of preventing the occurrence of a disaster due to the deformation of the underground pipe and the leakage from the underground pipe.
  • the present invention is capable of accurately analyzing the deformation of the underground pipe and the leakage from the underground pipe by sections. Consequently, the present invention has the effect of minimizing time necessary for repairing the underground pipe,

Abstract

Disclosed herein is an underground pipe deformation measuring apparatus comprising a measuring sensor including at least one displacement measuring optical fiber and at least one temperature measuring optical fiber which are disposed below an underground pipe, and a measuring unit including a light source generator connected to one end of the at least one displacement measuring optical fiber and one end of the at least one temperature measuring optical fiber for irradiating light, a deformation measurement analyzer for measuring the wavelength of the light reflected from the at least one displacement measuring optical fiber in real time to analyze the change of the at least one displacement measuring optical fiber, and a temperature measurement analyzer for measuring the wavelength of the light reflected from the at least one temperature measuring optical fiber in real time to analyze the change of the at least one temperature measuring optical fiber.

Description

APPARATUS AND SENSOR FOR MEASURING STRAIN OF UNDERGROUND PIPE
BACKGROUND OF THE INVENTION
Field of the Invention
The present invention relates to an underground pipe deformation measuring apparatus, a method of installing and using the same, and a measuring sensor used in the same, and, more particularly, to an underground pipe deformation measuring apparatus that is capable of quickly measuring the deformation of an underground pipe on the ground without damaging the underground pipe, a method of installing and using the same, and a measuring sensor used in the same.
Description of the Related Art
Generally, underground pipes are pipes used to deliver fluids. Underground pipes are classified depending upon kinds of used fluids they carry. For example, underground pipes may be classified into commercial pipes such as water supply and drainage pipes related to living, and industrial pipes such as oil pipes used to deliver petroleum, industry-related pipes, and chemical substance delivery pipes.
It is required to replace or repair an underground pipe when a leakage occurs from the underground pipe or cracks occur in the underground pipe. However, the underground pipe is buried under the ground with the result that it is very- difficult to confirm a leakage from the underground pipe or cracks in the underground pipe . In order to solve the above-mentioned problem, there have been developed apparatuses for measuring the deformation of an underground pipe or the damage to the underground pipe without the observation by the naked eye. An example thereof is disclosed in Korean Patent Registration No. 339634 entitled "a measuring method and apparatus using an optical fiber," which was filed in the name of the applicant of the present patent application and registered as a patent.
Specifically, the conventional measuring method is characterized in that an optical fiber, which exhibits the change of transmitted light depending upon the deformation of a pipe, is integrally attached to the pipe over the total length of the pipe along regions where the optical fiber is not in contact with fluid flowing through the pipe, and light passing through the optical fiber is reflected from the end point of the optical fiber. Consequently, the conventional measuring method is capable of measuring the deformation amount of the pipe based on the reflected light.
Also, the conventional measuring apparatus includes an optical fiber integrally attached to a pipe over the total length of the pipe along regions where the optical fiber is not in contact with fluid flowing through the pipe, the optical fiber reflecting light from the end point thereof, a light source generator for irradiating light to the start point of the optical fiber, and a measuring unit for receiving light reflected from the end point of the optical fiber. Consequently, the conventional measuring apparatus is capable of measuring the deformation amount of the pipe based on the reflected light.
By using the above-described measuring method and apparatus, therefore, it is possible to measure the deformation of an underground pipe or the damage to the underground without the observation by the naked eye.
However, when manufacturing a pipe on which the optical fiber is wound, it is necessary to form a spiral groove along the outer surface of the pipe over the total length of the pipe and securely locate the optical fiber in the grooves. Otherwise, it is necessary to apply a bonding agent, such as epoxy, to the outer surface of the pipe and wind the optical fiber on the pipe. As a result, it is very difficult to manufacture such a pipe.
Specifically, when the pipe is manufactured by forming the spiral groove in the pipe and locating the optical fiber in the groove as described above, a great deal of cost and man power is necessary in the process for forming the spiral groove in the pipe. In addition, as the groove is formed in the pipe along the outer surface of the pipe, the total strength of the pipe decreases, whereby the pipe is easily damaged.
On the other hand, when the pipe is manufactured by applying the bonding agent, such as epoxy, to the outer surface of the pipe and winding the optical fiber on the pipe, a great deal of cost and man power is necessary in the process for applying the bonding agent to the outer surface of the pipe and winding the optical fiber on the pipe.
SUMMARY OF THE INVENTION
Therefore, the present invention has been made in view of the above problems, and it is an object of the present invention to provide an underground pipe deformation measuring apparatus that is capable of quickly analyzing the deformation of the underground pipe and the leakage from the underground pipe on the ground without damaging the outer portion of the underground pipe through the use of a measuring sensor disposed below the underground pipe for measuring the deformation and the temperature of the underground pipe, thereby taking a step for preventing the damage to the underground pipe, and a measuring sensor used in the same . It is another object of the present invention to provide an underground pipe deformation measuring apparatus that is capable of accurately analyzing the deformation of the underground pipe and the leakage from the underground pipe by sections, and a measuring sensor used in the same. In accordance with one aspect of the present invention, the above and other objects can be accomplished by the provision of an underground pipe deformation measuring apparatus comprising: a measuring sensor including at least one displacement measuring optical fiber and at least one temperature measuring optical fiber which are disposed below an underground pipe buried under the ground in the same direction of the underground pipe; and a measuring unit including a light source generator connected to one end of the at least one displacement measuring optical fiber and one end of the at least one temperature measuring optical fiber for irradiating light, a deformation measurement analyzer for measuring the wavelength of the light reflected from the at least one displacement measuring optical fiber in real time to analyze the change of the at least one displacement measuring optical fiber, thereby analyzing the deformation of the underground pipe, and a temperature measurement analyzer for measuring the wavelength of the light reflected from the at least one temperature measuring optical fiber in real time to analyze the change of the at least one temperature measuring optical fiber, thereby analyzing the leakage from the underground pipe.
In accordance with another aspect of the present invention, there is provided a measuring sensor disposed below an underground pipe buried under the ground for measuring the deformation of the underground pipe through a measuring unit, the measuring sensor comprising: at least one displacement measuring optical fiber and at least one temperature measuring optical fiber which are disposed below the underground pipe buried under the ground in the same direction of the underground pipe; and a belt-type case having a plurality of insertion holes in which the at least one displacement measuring optical fiber and the at least one temperature measuring optical fiber are inserted.
BRIEF DESCRIPTION OF THE DRAWINGS
The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a perspective view illustrating the entire construction of an underground pipe deformation measuring apparatus according to a first preferred embodiment of the present invention; FIG. 2 is a sectional view taken along line A-A of FIG. 1;
FIG. 3 is a cross-sectional view illustrating the measuring apparatus according to the first preferred embodiment of the present invention buried under the ground;
FIG. 4 is a sectional view taken along line B-B of FIG. 3;
FIG. 5 is a cross-sectional view illustrating a modification of the measuring apparatus according to the first preferred embodiment of the present invention buried under the ground;
FIG. 6 is a sectional view taken along line C-C of FIG. 5;
FIG. 7 is a perspective view illustrating the entire construction of an underground pipe deformation measuring apparatus according to a second preferred embodiment of the present invention;
FIG. 8 is a sectional view taken along line D-D of FIG. 7; FIG. 9 is a cross-sectional view illustrating the measuring apparatus according to the second preferred embodiment of the present invention buried under the ground;
FIG. 10 is a sectional view taken along line E-E of FIG. 9; FIG. 11 is a cross-sectional view illustrating a modification of the measuring apparatus according to the second preferred embodiment of the present invention buried under the ground; and
FIG. 12 is a sectional view taken along line F-F of FIG. 11.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Now, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings .
FIG. 1 is a perspective view illustrating the entire construction of an underground pipe deformation measuring apparatus according to a first preferred embodiment of the present invention, FIG. 2 is a sectional view taken along line A-A of FIG. 1, FIG. 3 is a cross-sectional view illustrating the measuring apparatus according to the first preferred embodiment of the present invention buried under the ground, and FIG. 4 is a sectional view taken along line B-B of FIG. 3.
The underground pipe deformation measuring apparatus according to the first preferred embodiment of the present invention comprises a measuring sensor 4 including at least one displacement measuring optical fiber 41 and at least one temperature measuring optical fiber 42 which are disposed below an underground pipe 1 buried under the ground in the same direction of the underground pipe 1, and a measuring unit 3 connected to one end of the displacement measuring optical fiber 41 and one end of the temperature measuring optical fiber 42 for irradiating light to measure the wavelength of the light reflected from the displacement measuring optical fiber 41 and the temperature measuring optical fiber 42 in real time and for analyzing the change of the displacement measuring optical fiber 41 and the temperature measuring optical fiber 42 to analyze the deformation of the underground pipe 1 and the leakage from the underground pipe 1.
The measuring sensor 4 further includes a belt-type case 43 having a plurality of insertion holes 431 in which the displacement measuring optical fiber 41 and the temperature measuring optical fiber 42, which are disposed below the underground pipe 1 buried under the ground in the same direction of the underground pipe 1, are inserted.
The belt-type case 43, which constitutes the measuring sensor 4, is made of a material whose shape can be changed when the underground pipe 1 is deformed.
The displacement measuring optical fiber 41 and the temperature measuring optical fiber 42 are communication- purpose optical fibers constructed such that, when light is irradiated to one end of each optical fiber, the wavelength of the light is reflected from the other end of each optical fiber.
The measuring unit 3 includes a light source generator 31 connected to one end of the displacement measuring optical fiber 41 and one end of the temperature measuring optical fiber 42 for irradiating light, a deformation measurement analyzer 32 for measuring the wavelength of the light reflected from the displacement measuring optical fiber 41 in real time to analyze the change of the displacement measuring optical fiber 41, thereby analyzing the deformation of the underground pipe 1, and a temperature measurement analyzer 33 for measuring the wavelength of the light reflected from the temperature measuring optical fiber 42 in real time to analyze the change of the temperature measuring optical fiber 42, thereby analyzing the leakage from the underground pipe 1.
That is, the measuring unit 3 is constructed such that the wavelength of the light reflected from the displacement measuring optical fiber 41 and inputted thereto is analyzed to analyze the change of the displacement measuring optical fiber 41, thereby analyzing the deformation of the underground pipe 1, and the wavelength of the light reflected from the temperature measuring optical fiber 42 and inputted thereto is analyzed to analyze the change of the temperature measuring optical fiber 42, thereby analyzing the leakage from the underground pipe 1.
Hereinafter, the measuring unit with the above-stated construction will be described in more detail.
The light source generator 31 of the measuring unit 3 is constructed to irradiate light to one end of the displacement measuring optical fiber 41 and one end of the temperature measuring optical fiber 42. Several kinds of light source generators are well known.
The deformation measurement analyzer 32 of the measuring unit 3 analyzes the wavelength of the light reflected from the displacement measuring optical fiber 41 and inputted to the deformation measurement analyzer 32 to analyze the change of the displacement measuring optical fiber 41, thereby analyzing the deformation of the underground pipe 1. Also, the temperature measurement analyzer 33 of the measuring unit 3 analyzes the wavelength of the light reflected from the temperature measuring optical fiber 42 and inputted to the temperature measurement analyzer 33 to analyze the change of the temperature measuring optical fiber 42.
Hereinafter, a process for installing the underground pipe deformation measuring apparatus with the above-stated construction according to the first preferred embodiment of the present invention and the operation of the installed underground pipe deformation measuring apparatus will be described.
When installing the underground pipe deformation measuring apparatus according to the present invention, an underground depression in which the underground pipe 1 is to be buried is dug, and then the displacement measuring optical fiber 41 and the temperature measuring optical fiber 42 connected to the measuring unit 3 are positioned at the lower part of the underground depression, as shown in FIGS. 1 to 4. Subsequently, the underground depression is partially filled with soil such that the displacement measuring optical fiber 41 and the temperature measuring optical fiber 42 are covered with the soil, and then the underground pipe 1 is laid . on the soil covering the displacement measuring optical fiber 41 and the temperature measuring optical fiber 42, whereby the process for installing the underground pipe deformation measuring apparatus according to the present invention is completed.
The installed underground pipe deformation measuring apparatus is operated as follows: when the ground sinks due to external causes, and therefore, the underground pipe 1 moves downward, the displacement measuring optical fiber 41 disposed below the underground pipe 1 is deformed as shown in FIGS. 1 to 4.
As a result, the position of the wavelength of light reflected from the displacement measuring optical fiber 41 changes, and the position change of the wavelength of the reflected light is analyzed by the deformation measurement analyzer 32 constituting the measuring unit 3 to quickly confirm the deformation of the underground pipe 1. Consequently, it is possible to quickly confirm the deformation of the underground pipe 1 in the initial stage in which the underground pipe 1 is deformed, thereby taking a step for preventing the damage to the underground pipe 1.
In addition, when a portion of the underground pipe 1 is damaged due to internal pressure or ground sinkage, and therefore, a leakage occurs from the underground pipe 1, the temperature of the temperature measuring optical fiber 42 disposed below the underground pipe 1 changes due to the leakage as shown in FIGS. 1 to 4. As a result, the amplitude of the wavelength of light reflected from the temperature measuring optical fiber 42 changes, and the amplitude change of the wavelength of the reflected light is analyzed by the temperature measurement analyzer 33 constituting the measuring unit 3 to quickly confirm the leakage from the underground pipe 1.
Consequently, it is possible to quickly confirm the leakage from the underground pipe 1 in the initial stage in which the leakage occurs from the underground pipe 1, thereby minimizing the spread of the leakage from the underground pipe 1. FIG. 5 is a cross-sectional view illustrating a modification of the measuring apparatus according to the first preferred embodiment of the present invention buried under the ground, and FIG. 6 is a sectional view taken along line C-C of FIG. 5.
The modification of the measuring apparatus according to the first preferred embodiment of the present invention includes the same components as the measuring apparatus according to the first preferred embodiment of the present invention. In addition, a heating wire 35 is disposed on the belt-type case 43 above the insertion hole 431 in which the temperature measuring optical fiber 42 is inserted while the heating wire 35 is in tight contact with the belt-type case 43, and the measuring unit 3 further includes a power supply 34 for supplying power to the heating wire 35 to increase the temperature of the temperature measuring optical fiber 42.
When the temperature of the optical fiber increases, the medium of the optical fiber is changed. When analyzing a signal reflected at this time, the variation width of the temperature increases. When increasing the temperature of the temperature measuring optical fiber 42, therefore, the amplitude of the wavelength of the reflected light is increased. As a result, when the leakage occurs from the underground pipe, and therefore, the temperature of the optical fiber decreases or increases, the variation width of the temperature at the optical fiber is changed as compared to the surroundings.
Consequently, it is possible to accurately analyze the leakage from the underground pipe based on the temperature change of the temperature measuring optical fiber 42.
FIG. 7 is a perspective view illustrating the entire construction of an underground pipe deformation measuring apparatus according to a second preferred embodiment of the present invention, FIG. 8 is a sectional view taken along line D-D of FIG. 7, FIG. 9 is a cross-sectional view illustrating the measuring apparatus according to the second preferred embodiment of the present invention buried under the ground, and FIG. 10 is a sectional view taken along line E-E of FIG. 9.
The underground pipe deformation measuring apparatus according to the second preferred embodiment of the present invention comprises a measuring sensor 4 including at least one displacement measuring optical fiber 41 and at least one temperature measuring optical fiber 42 which are disposed below an underground pipe 1 buried under the ground in the same direction of the underground pipe 1, and a measuring unit 3 connected to one end of the displacement measuring optical fiber 41 and one end of the temperature measuring optical fiber 42 for irradiating light to measure the wavelength of the light reflected from the displacement measuring optical fiber 41 and the temperature measuring optical fiber 42 in real time and for analyzing the change of the displacement measuring optical fiber 41 and the temperature measuring optical fiber 42 to analyze the deformation of the underground pipe 1 and the leakage from the underground pipe 1.
The measuring sensor 4 according to the second preferred embodiment of the present invention is identical in construction to the measuring sensor 4 according to the previous embodiment of the present invention except the displacement measuring optical fiber 41 and the temperature measuring optical fiber 42.
Specifically, the displacement measuring optical fiber 41 and the temperature measuring optical fiber 42 are distribution-type (lattice-type) optical fibers constructed such that, when a plurality of lights having different frequencies are irradiated to one end of each optical fiber, the lights are reflected by sections. The measuring unit 3 includes a light source generator 31 connected to one end of the displacement measuring optical fiber 41 and one end of the temperature measuring optical fiber 42 for irradiating lights having different frequencies, a deformation measurement analyzer 32 for measuring the wavelengths of the sectional lights reflected from the displacement measuring optical fiber 41 in real time to analyze the change of the displacement measuring optical fiber 41, thereby analyzing the deformation of the underground pipe 1, and a temperature measurement analyzer 33 for measuring the wavelengths of the sectional lights reflected from the temperature measuring optical fiber 42 in real time to analyze the change of the temperature measuring optical fiber 42, thereby analyzing the leakage from the underground pipe 1. Also, the at least one displacement measuring optical fiber 41 comprises a plurality of displacement measuring optical fibers 41. In this case, the measuring sensor 4 further includes a belt-type case 43 having a plurality of insertion holes 431 in which the displacement measuring optical fibers 41 and the temperature measuring optical fiber 42 are inserted. The insertion holes 431 in which the displacement measuring optical fibers 41 are inserted have different diameters such that the displacement measuring optical fibers 41 can be linearly inserted in the corresponding insertion holes 431 with different lengths of the measurement sections.
Specifically, the measuring unit 3 is constructed such that the wavelengths of the lights having different freguencies irradiated to the respective displacement measuring optical fibers 41, reflected sectionally from the respective displacement measuring optical fibers 41, and inputted thereto are analyzed to analyze the sectional change of the respective displacement measuring optical fibers 41, thereby analyzing the sectional deformation of the underground pipe 1. Also, the measuring unit 3 is constructed such that the wavelengths of the lights reflected sectionally from the at least one temperature measuring optical fiber 42 and inputted thereto are analyzed to analyze the sectional change of the temperature measuring optical fiber 42, thereby analyzing the leakage from the underground pipe 1.
Hereinafter, the measuring unit with the above-stated construction will be described in more detail.
The light source generator 31 of the measuring unit 3 is constructed to irradiate a plurality of lights having different frequencies to the respective displacement measuring optical fibers 41 and to irradiate a plurality of lights having different frequencies one end of the at least one temperature measuring optical fiber 42. Several kinds of light source generators are well known.
The deformation measurement analyzer 32 of the measuring unit 3 analyzes the wavelengths of the lights having different frequencies reflected sectionally from the respective displacement measuring optical fibers 41 and inputted to the deformation measurement analyzer 32 to analyze the sectional change of the respective displacement measuring optical fibers 41, thereby analyzing the deformation of the underground pipe 1. Also, the temperature measurement analyzer 33 of the measuring unit 3 analyzes the wavelengths of the lights having different frequencies reflected from the at least one temperature measuring optical fiber 42 and inputted to the temperature measurement analyzer 33 to analyze the sectional change of the temperature measuring optical fiber 42. Hereinafter, a process for installing the underground pipe deformation measuring apparatus with the above-stated construction according to the second preferred embodiment of the present invention and the operation of the installed underground pipe deformation measuring apparatus will be described.
When installing the underground pipe deformation measuring apparatus according to the present invention, an underground depression in which the underground pipe 1 is to be buried is dug, and then the displacement measuring optical fibers 41 and the temperature measuring optical fiber 42 connected to the measuring unit 3 are positioned at the lower part of the underground depression, as shown in FIGS. 7 to 10. Subsequently, the underground depression is partially filled with soil such that the displacement measuring optical fibers 41 and the temperature measuring optical fiber 42 are covered with the soil, and then the underground pipe 1 is laid on the soil covering the displacement measuring optical fibers 41 and the temperature measuring optical fiber 42, whereby the process for installing the underground pipe deformation measuring apparatus according to the present invention is completed.
The installed underground pipe deformation measuring apparatus according to the second preferred embodiment of the present invention is operated as follows: when the ground sinks due to external causes, and therefore, the underground pipe 1 moves downward, the lattice-type displacement measuring optical fibers 41 disposed below the underground pipe 1 are deformed as shown in FIGS. 7 to 10.
As a result, the positions of the wavelengths of lights reflected sectionally from the displacement measuring optical fibers 41 change, and the position changes of the wavelengths of the sectionally reflected lights are analyzed by the deformation measurement analyzer 32 constituting the measuring unit 3 to quickly confirm the sectional changes of the respective displacement measuring optical fibers 41.
Consequently, it is possible to quickly confirm the sectional deformation of the underground pipe 1 in the initial stage in which the underground pipe 1 is deformed, thereby preventing the damage to the underground pipe 1. In addition, when a portion of the underground pipe 1 is damaged due to internal pressure or ground sinkage, and therefore, a leakage occurs from the underground pipe 1, the temperature of the at least one temperature measuring optical fiber 42 disposed below the underground pipe 1 changes due to the leakage as shown in FIGS. 7 to 10.
As a result, the amplitudes of the wavelengths of lights reflected sectionally from the distribution-type temperature measuring optical fiber 42 change, and the amplitude changes of the wavelengths of the reflected lights are analyzed by the temperature measurement analyzer 33 constituting the measuring unit 3 to quickly confirm the leakage from the underground pipe 1.
Consequently, it is possible to quickly confirm the leakage from the underground pipe 1 in the initial stage in which the leakage occurs from the underground pipe 1, thereby minimizing the spread of the leakage from the underground pipe 1.
Meanwhile, when the distribution-type displacement measuring optical fibers 41 are inserted linearly in the corresponding insertion holes 431, having different sizes, formed in the deformable belt-type case 43 as shown in FIGS.
7 and 8, the following phenomenon occurs.
In the case of the distribution-type displacement measuring optical fiber 41 inserted in the small-diameter insertion hole 431, the contact between the distribution-type displacement measuring optical fiber 41 and the inner surface of the insertion hole 431 increases even when the belt-type case 43 is slightly bent with the result that the distribution-type displacement measuring optical fiber 41 is severely bent at each section.
In the case of the distribution-type displacement measuring optical fiber 41 inserted in the large-diameter insertion hole 431, on the other hand, the distribution-type displacement measuring optical fiber 41 is not brought into contact with the inner surface of the insertion hole 431 when the belt-type case 43 is slightly bent. Only when the belt- type case 43 is severely bent, the distribution-type displacement measuring optical fiber 41 is deformed.
Consequently, when the distance between the inner surfaces of the insertion holes and the corresponding distribution-type displacement measuring optical fibers 41 are changed, it is possible to measure the initial displacement (to a break point of the optical fiber) of the underground pipe through the sectional wavelength changes of the distribution-type displacement measuring optical fiber 41 inserted in the small-diameter insertion hole. Also, it is possible to measure the displacement of the underground pipe beyond the measurement range of the distribution-type displacement measuring optical fiber 41 inserted in the small-diameter insertion hole through the sectional wavelength changes of the distribution-type displacement measuring optical fiber 41 inserted in the large-diameter insertion hole, thereby measuring the large deformation of the underground pipe 1 and thus measuring more accurately the deformation of the underground pipe 1.
FIG. 11 is a cross-sectional view illustrating a modification of the measuring apparatus according to the second preferred embodiment of the present invention buried under the ground, and FIG. 12 is a sectional view taken along line F-F of FIG. 11.
The modification of the measuring apparatus according to the second preferred embodiment of the present invention includes the same components as the measuring apparatus according to the second preferred embodiment of the present invention. In addition, a heating wire 35 is disposed on the belt-type case 43 above the insertion hole 431 in which the at least one lattice-type temperature measuring optical fiber 42 is inserted while the heating wire 35 is in tight contact with the belt-type case 43, and the measuring unit 3 further includes a power supply 34 for supplying power to the heating wire 35 to increase the temperature of the temperature measuring optical fiber 42.
When the temperature of the optical fiber increases, the medium of the optical fiber is changed. When analyzing a signal reflected at this time, the variation width of the temperature increases. When increasing the temperature of the temperature measuring optical fiber 42, therefore, the amplitude of the wavelength of the reflected light is increased. As a result, when the leakage occurs from the underground pipe, and therefore, the temperature of the optical fiber decreases or increases, the variation width of the temperature at the optical fiber is changed as compared to the surroundings.
Consequently, it is possible to accurately analyze the leakage from the underground pipe based on the temperature change of the temperature measuring optical fiber 42.
As apparent from the above description, the present invention is capable of quickly analyzing the deformation of the underground pipe and the leakage from the underground pipe on the ground without damaging the outer portion of the underground pipe and thus preventing the strength of the underground pipe from decreasing. Consequently, the present invention has the effect of preventing the occurrence of a disaster due to the deformation of the underground pipe and the leakage from the underground pipe.
Furthermore, the present invention is capable of accurately analyzing the deformation of the underground pipe and the leakage from the underground pipe by sections. Consequently, the present invention has the effect of minimizing time necessary for repairing the underground pipe,

Claims

WHAT IS CLAIMED IS:
1. An underground pipe deformation measuring apparatus comprising: a measuring sensor including at least one displacement measuring optical fiber and at least one temperature measuring optical fiber which are disposed below an underground pipe buried under the ground in the same direction of the underground pipe; and a measuring unit including a light source generator connected to one end of the at least one displacement measuring optical fiber and one end of the at least one temperature measuring optical fiber for irradiating light, a deformation measurement analyzer for measuring the wavelength of the light reflected from the at least one displacement measuring optical fiber in real time to analyze the change of the at least one displacement measuring optical fiber, thereby analyzing the deformation of the underground pipe, and a temperature measurement analyzer for measuring the wavelength of the light reflected from the at least one temperature measuring optical fiber in real time to analyze the change of the at least one temperature measuring optical fiber, thereby analyzing the leakage from the underground pipe.
2. The measuring apparatus according to claim 1, wherein the at least one displacement measuring optical fiber and the at least one temperature measuring optical fiber are communication-purpose optical fibers constructed such that, when light is irradiated to one end of each optical fiber, the wavelength of the light is reflected from the other end of each optical fiber.
3. The measuring apparatus according to claim 2, wherein the measuring sensor further includes a belt-type case having a plurality of insertion holes in which the at least one displacement measuring optical fiber and the at least one temperature measuring optical fiber are inserted.
4. The measuring apparatus according to claim 2 or 3, wherein the measuring unit analyzes the wavelength of the light reflected from the at least one displacement measuring optical fiber and inputted thereto to analyze the deformation of the underground pipe, and the measuring unit analyzes the wavelength of the light reflected from the at least one temperature measuring optical fiber and inputted thereto to analyze the leakage from the underground pipe.
5. The measuring apparatus according to claim 4, further comprising: a heating wire disposed on the belt-type case above the insertion hole in which the at least one temperature measuring optical fiber is inserted while the heating wire is in tight contact with the belt-type case; and a power supply included in the measuring unit for supplying power to the heating wire to increase the temperature of the at least one temperature measuring optical fiber.
6. The measuring apparatus according to claim 1, wherein the at least one displacement measuring optical fiber and the at least one temperature measuring optical fiber are lattice-type optical fibers constructed such that, when a plurality of lights having different frequencies are irradiated to one end of each optical fiber, the lights are reflected by sections.
7. The measuring apparatus according to claim 6, wherein the at least one displacement measuring optical fiber comprises a plurality of displacement measuring optical fibers, the measuring sensor further includes a belt-type case having a plurality of insertion holes in which the plurality of displacement measuring optical fibers and the at least one temperature measuring optical fiber are inserted, and the insertion holes in which the displacement measuring optical fibers are inserted have different diameters such that the displacement measuring optical fibers can be linearly inserted in the corresponding insertion holes with different lengths of the measurement sections .
8. The measuring apparatus according to claim 6 or 7, wherein the measuring unit analyzes the wavelengths of the lights having different frequencies irradiated to the respective displacement measuring optical fibers, reflected sectionally from the respective displacement measuring optical fibers, and inputted thereto to analyze the sectional deformation of the underground pipe, and the measuring unit analyzes the wavelengths of the lights reflected sectionally from the at least one temperature measuring optical fiber and inputted thereto to analyze the sectional leakage from the underground pipe 1.
9. The measuring apparatus according to claim 8, further comprising: a heating wire disposed on the belt-type case above the insertion hole in which the at least one temperature measuring optical fiber is inserted while the heating wire is in tight contact with the belt-type case; and a power supply included in the measuring unit for supplying power to the heating wire to increase the temperature of the at least one temperature measuring optical fiber.
10. A measuring sensor disposed below an underground pipe buried under the ground for measuring the deformation of the underground pipe through a measuring unit, the measuring sensor comprising: at least one displacement measuring optical fiber and at least one temperature measuring optical fiber which are disposed below the underground pipe buried under the ground in the same direction of the underground pipe; and a belt-type case having a plurality of insertion holes in which the at least one displacement measuring optical fiber and the at least one temperature measuring optical fiber are inserted.
11. The measuring sensor according to claim 10, wherein the at least one displacement measuring optical fiber and the at least one temperature measuring optical fiber are communication-purpose optical fibers constructed such that, when light is irradiated to one end of each optical fiber, the wavelength of the light is reflected from the other end of each optical fiber.
12. The measuring sensor according to claim 12, further comprising: a heating wire disposed on the belt-type case above the insertion hole in which the at least one temperature measuring optical fiber is inserted while the heating wire is in tight contact with the belt-type case, the heating wire emitting heat when the heating wire is energized.
13. The measuring sensor according to claim 10, wherein the at least one displacement measuring optical fiber and the at least one temperature measuring optical fiber are lattice-type optical fibers constructed such that, when a plurality of lights having different frequencies are irradiated to one end of each optical fiber, the lights are reflected by sections.
14. The measuring sensor according to claim 13, wherein the at least one displacement measuring optical fiber comprises a plurality of displacement measuring optical fibers , the measuring sensor further includes a belt-type case having a plurality of insertion holes in which the plurality of displacement measuring optical fibers and the at least one temperature measuring optical fiber are inserted, and the insertion holes in which the displacement measuring optical fibers are inserted have different diameters such that the displacement measuring optical fibers can be linearly inserted in the corresponding insertion holes with different lengths of the measurement sections .
15. The measuring sensor according to claim 14, further comprising: a heating wire disposed on the belt-type case above the insertion hole in which the at least one temperature measuring optical fiber is inserted while the heating wire is in tight contact with the belt-type case, the heating wire emitting heat when the heating wire is energized.
PCT/KR2006/005652 2005-12-22 2006-12-22 Apparatus and sensor for measuring strain of underground pipe WO2007073114A1 (en)

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KR10-2005-0128229 2005-12-22
KR1020050128229A KR100764932B1 (en) 2005-12-22 2005-12-22 Deformation and temperature sensor of underground pipe-line
KR1020050128220A KR100764931B1 (en) 2005-12-22 2005-12-22 Apparatus of deformation measurement for underground pipe-line
KR10-2005-0128220 2005-12-22

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CN102346016B (en) * 2010-07-28 2013-11-06 中国石油天然气股份有限公司 Mined-out subsidence area soil horizontal deformation monitoring method and system thereof
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CN103383243B (en) * 2012-05-04 2016-12-14 中国石油天然气股份有限公司 A kind of permafrost region oil and gas pipes displacement monitoring method and system
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CN105257293A (en) * 2015-09-24 2016-01-20 中国矿业大学 Method for mining pressed coal below shallow buried gas delivery pipelines

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