Detection method and device for leakage point of jacking pipe

Abstract

The present invention discloses a method and device for detecting leakage points of a jacking pipe. The method comprises the following steps: filling a mixed liquid containing a radioactive isotope tracer into the jacking pipe to be detected, and draining the mixture after standing for a period of time; establishing a jacking pipe stereo model, and obtaining the relative position coordinates of each detection point relative to the center point of the jacking pipe in a certain end face in combination with the axis trajectory of the detection device in the stereo model; the detection device moves along the axis trajectory inside the jacking pipe, and when performing circumferential detection on a certain end face, obtains the radioactive energy data corresponding to each detection point in the annular face; and uploading the position coordinates and the radioactive energy data to a host computer, presenting a radioactive detection distribution position map; the host computer determines whether there is a leakage crack in the pipeline according to the radioactive detection distribution position map. The present invention solves the problem that it is difficult to accurately locate small leakage points in the functional test of jacking pipes with large burial depths, and is suitable for detecting leakage points of jacking pipes of various lengths and burial depths.

Description

Technical Field

[0001] The invention relates to the technical field of building engineering, and in particular to a method and a device for detecting leakage points of a jacking pipe. Background Art

[0002] Pipe jacking is a trenchless construction method that can be used to bury pipes across roads, railways, rivers, ground buildings, underground structures, and various underground pipelines. Pipe jacking is to overcome the friction between the pipe and the surrounding soil in the working pit with the help of the jacking force generated by the jacking equipment, push the pipe into the soil according to the designed slope, and transport the soil away.

[0003] The current technical specifications require that after the construction is completed, the pipe jacking should be tested for pipe functionality. The test medium is generally water. If the water seepage in the pipe jacking, water pressure drop, and water seepage on the outer wall of the pipe meet the requirements, the pipe jacking construction is considered qualified. If the water seepage in the pipe jacking, water pressure drop, and water seepage on the outer wall of the pipe do not meet the requirements, the pipe jacking construction is considered unqualified. For unqualified pipe jacking, it is necessary to locate the leakage point and then take the next step of repair measures.

[0004] In the prior art, there are several methods for detecting buried pipe leaks, such as noise collection method, endoscope method, and tracer gas detection method. However, there are the following disadvantages when applying the above three methods to the detection of leakage points of long-distance and deep buried pipe tops:

[0005] Noise collection method: This method has certain requirements on the decibel level of multiple noises. For deep buried pipe jacking, it is difficult to collect the sound of water flow from the ground, and most of these pipes are seeping water, and the sound of water flow generated is relatively small, which is even more difficult to collect and locate.

[0006] Endoscopic method: The endoscope in this method can only detect larger cracks, but not smaller cracks;

[0007] Tracer gas detection method: When the pipeline is buried deep, the tracer gas diffusion range is large, the error is also large, and this method can only locate the approximate location of the leak, and cannot locate the specific leak point. Summary of the invention

[0008] In order to solve the above technical problems, the present invention proposes a method and a device for detecting leakage points of jacking pipes, which solves the problem that small leakage points of jacking pipes with great burial depths are difficult to accurately locate in functional tests.

[0009] To achieve the above object, the present invention is designed to detect the leakage point of a jacking pipe, which is special in that the method comprises the following steps:

[0010] S1) Fill the pipe to be detected with a mixed solution containing a radioactive isotope tracer, and drain it after it has been left to stand for a period of time;

[0011] S2) establishing a three-dimensional model of the jacking pipe, and obtaining the relative position coordinates of each detection point relative to the center point of the jacking pipe in a certain end face in combination with the trajectory of the axis of the detection device in the three-dimensional model;

[0012] S3) the detection device moves along the axial trajectory inside the top pipe, and when performing circumferential detection on a certain end face, the radiation energy data corresponding to each detection point in the annular surface is obtained;

[0013] S4) The detection device uploads the position coordinates of each detection point in a certain end face and the radiation energy data corresponding to each detection point to the upper computer, which integrates the obtained coordinates and energy data to present a radioactive detection distribution position diagram, wherein the radioactive detection distribution position diagram takes the center of the pipeline as the coordinate origin in a certain annular surface, displays the relative position relationship between the radiation points on the inner wall of the top pipe, the cracks in the pipe wall, and the outside of the cracks and the top pipe, and indicates the intensity of the radiation energy at a certain position by the depth of color;

[0014] S5) The host computer determines whether there are leakage cracks in the pipeline according to the radioactive detection distribution position map.

[0015] Furthermore, in step S1), the mixed solution is a radioactive isotope tracer and a test medium water, and the radioactive isotope tracer is a hydrogen and oxygen isotope tracer.

[0016] Furthermore, in step S1), during the static time, pressure may be applied to the top pipe to a set threshold.

[0017] Furthermore, in step S1), the end of the jacking pipe is connected to a working well leading to the ground.

[0018] Further, in step S3), the detection device includes a mobile cart, on which is fixed a nuclear probe for detecting residual radioactive rays, and on which is fixed an information transmitter for transmitting detection data to a host computer, the nuclear probe and the information transmitter are electrically connected, and the mobile cart, the nuclear probe, and the information transmitter are respectively connected to the host computer.

[0019] Furthermore, in step S3), the mobile vehicle is an electrically driven remote-controlled walking device, and the mobile vehicle control system is wirelessly connected to the host computer.

[0020] Furthermore, in step S4), the host computer presents a radioactive detection distribution location map through BIM software.

[0021] Further, in step S5), the host computer determines whether there is a leakage crack in the pipeline by:

[0022] As the detection device continues to move and detect, the host computer continuously collects detection data and eventually forms a leakage model of the top pipe. In the leakage model, the radioactive element images distributed on the inner wall of the top pipe and the outside of the crack are removed, and only the radioactive element images of the cracks on the top pipe wall are retained, thereby obtaining the crack path and the coordinates of the leakage point.

[0023] The present invention also provides a device for detecting leakage points of a jacking pipe, which is suitable for the above-mentioned method for detecting leakage points of a jacking pipe. The device is special in that it includes a mobile trolley, on which a nuclear probe for detecting residual radioactive rays is fixed, and on which an information transmitter for transmitting detection data to a host computer is also fixed, and the nuclear probe and the information transmitter are electrically connected, and the mobile trolley, the nuclear probe, and the information transmitter are respectively connected to the host computer.

[0024] Furthermore, the mobile vehicle, the nuclear probe, and the information transmitter are wirelessly connected to the computer respectively.

[0025] The advantages of the present invention are:

[0026] 1. The present invention uses a mixture of radioactive isotope tracer and water as a medium to perform a functional test on the top pipe. The mixed liquid containing the radioactive isotope tracer reaches the outer wall of the top pipe through the cracks in the pipe wall, and leaves traces of the isotope tracer in the cracks in the pipe wall. The relative position coordinates of each detection point relative to the center point of the top pipe in a certain end face are obtained by establishing a top pipe three-dimensional model, and the intensity of the radioactive energy corresponding to each detection point in a certain annular surface is obtained by a detection device. Then, the position coordinates of each detection point and the radioactive energy data corresponding to each detection point are uploaded to a host computer, and a radioactive detection distribution position diagram is presented, showing the relative position relationship between the inner wall of the top pipe, the cracks in the pipe wall, and the radioactive points outside the cracks and the top pipe, and the intensity of the radioactive energy at a certain position is indicated by the depth of color, thereby solving the problem that the leakage point is difficult to accurately locate in the current top pipe functional test, and is closer to practical application than the current underground pipeline leakage detection method on the market;

[0027] 2. The present invention continuously detects the inner wall of the top pipe, the cracks in the pipe wall and the residual radioactive rays outside the cracks by using a mobile car in conjunction with a nuclear probe, and continuously uploads the position coordinates of different detection points and the corresponding radiation energy data to a host computer, and finally forms a leakage model of the top pipe. In the leakage model, the radioactive element images distributed on the inner wall of the top pipe and the outside of the cracks are removed, and only the radioactive element images of the cracks in the top pipe wall are retained, thereby obtaining the crack path and the coordinates of the leakage point;

[0028] 3. The present invention promotes the penetration of radioactive isotope tracer into the leakage gap on the top pipe wall by applying pressure to the top pipe or leaving it still, thus solving the problem that small cracks cannot be found;

[0029] 4. The present invention uses a mobile trolley to move inside the jacking pipe for inspection, which is applicable to jacking pipes of various calibers and avoids the disadvantages of manual crawling inside the jacking pipe for inspection;

[0030] The method and device for detecting leakage points of jacking pipes of the present invention solve the problem that small leakage points of jacking pipes with great burial depths are difficult to accurately locate in functional tests, and are suitable for detecting leakage points of jacking pipes of various lengths, distances and burial depths. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a flow chart of the detection method of the present invention;

[0032] Figure 2 It is a schematic diagram of the detection device of the present invention during construction;

[0033] Figure 3 A distribution position diagram of radioactivity detection on any end surface of the jacking pipe in the present invention;

[0034] Figure 4 is the leakage model of the jacking pipe on any end face in the present invention;

[0035] In the figure: working well 1, jacking pipe 2, nuclear probe 3, information transmitter 4, mobile vehicle 5, host computer 6. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0037] In the description of the present invention, it is necessary to understand that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the invention.

[0038] like Figure 1 As shown, the present invention proposes a method for detecting a leakage point of a jacking pipe, and the method comprises the following steps:

[0039] S1) Fill the top pipe 2 to be detected with a mixed liquid containing a radioactive isotope tracer, and drain it after leaving it to stand for a period of time.

[0040] Specifically, the mixed liquid is a radioactive isotope tracer and test medium water, and the radioactive isotope tracer is a hydrogen and oxygen isotope tracer.

[0041] Preferably, during the static time, pressure can be applied to the top pipe 2 to a set threshold. The top pipe 2 is static or pressure-stabilized for a period of time according to the experimental requirements. If leakage occurs during this period, the mixed liquid containing the isotope tracer will reach the outer wall of the constructed pipeline 2 through the leakage point, leaving traces at the gap.

[0042] The pressure setting threshold is the required value of the pipeline functional test. In this embodiment, the threshold is set to 0.5 MPa, and the static time is 0.5 h after the leakage is found.

[0043] The invention promotes the radioactive isotope tracer to penetrate into the leakage point gap on the top pipe wall by applying pressure to the top pipe or leaving it still, thereby solving the problem that small cracks cannot be found.

[0044] Preferably, the end of the jacking pipe 2 is connected to a working well 1 leading to the ground. Figure 2 As shown, a section of the jacking pipe 2 has been constructed, and the functional test of the constructed pipeline 2 is carried out according to the current specification requirements, and the corresponding facilities refer to the conventional process. When injecting the experimental medium, hydrogen and oxygen isotope tracers that are easily soluble in water are mixed with the test water and injected together.

[0045] S2) establishing a three-dimensional model of the top pipe 2, and obtaining the relative position coordinates of each detection point relative to the center point of the top pipe 2 in a certain end face in the three-dimensional model in combination with the trajectory of the axis line of the detection device.

[0046] S3) The detection device moves along the axial trajectory inside the top pipe 2, and when performing circumferential detection on a certain end face, the radiation energy data corresponding to each detection point in the annular surface is obtained.

[0047] Specifically, the detection device includes a mobile cart 5, on which is fixed a nuclear probe 3 for detecting residual radioactive rays. The mobile cart 5 is also fixed with an information transmitter 4 for transmitting detection data to a host computer 6. The nuclear probe 3 and the information transmitter 4 are electrically connected, and the mobile cart 5, the nuclear probe 3, and the information transmitter 4 are respectively connected to the host computer 6.

[0048] Preferably, the mobile vehicle 5 is an electrically driven remote-controlled walking device, and the control system of the mobile vehicle 5 is wirelessly connected to the host computer 6 .

[0049] The mobile cart 5 is placed into the top pipe 2 and moves along the bottom of the top pipe 2. The forward movement and the return movement are regarded as one detection. During the detection process, the nuclear probe 3 fixed on the mobile cart 5 continuously detects the residual radioactive rays and tracks the coordinate position and radiation energy of the radioactive elements on the inner wall, outer wall and leakage point gap of the top pipe 2.

[0050] In addition, the concentration of the mixed liquid is determined according to the volume ratio to meet the detection requirements of the nuclear probe 3.

[0051] S4) The detection device uploads the position coordinates of each detection point in a certain end face and the radiation energy data corresponding to each detection point to the upper computer 6, and the upper computer 6 integrates the obtained coordinates and energy data to present a radioactive detection distribution position diagram. The radioactive detection distribution position diagram takes the center of the pipeline as the coordinate origin in a certain annular surface, displays the relative position relationship between the radiation points on the inner wall of the top pipe 2, the cracks in the pipe wall, and the outside of the cracks and the top pipe 2, and indicates the intensity of the radiation energy at a certain position by the depth of color.

[0052] Preferably, the host computer 6 presents a radioactive detection distribution location map through BIM software.

[0053] BIM (Building Information Modeling) is a building information model that consists of sufficient information to support new product development management and can be directly interpreted by computer applications. It is the life cycle management of the building environment supported by digital technology.

[0054] The radioactive rays remaining on the inner wall of the top pipe 2, the cracks in the pipe wall and the outside of the cracks are collected and processed, and then transmitted to the host computer 6 together with the real-time position of the mobile car 5, forming a signal on any end face of the top pipe 2. Figure 3 The picture shown is a radioactive element distribution model presented on any end surface of the top pipe 2.

[0055] S5) The host computer 6 determines whether there is leakage crack in the pipeline according to the radioactive detection distribution position map.

[0056] Specifically, the method for the host computer 6 to determine whether there is a leakage crack in the pipeline is:

[0057] As the detection device continues to move and detect, the host computer 6 continuously collects detection data and eventually forms a leakage model of the top pipe 2. In the leakage model, the radioactive element images distributed on the inner wall of the top pipe 2 and the outside of the crack are removed, and only the radioactive element images of the cracks in the wall of the top pipe 2 are retained, thereby obtaining the crack path and the coordinates of the leakage point.

[0058] The nuclear probe 3 continuously detects the beta rays emitted by the residual isotope tracer on the inner wall, outer wall and gap of the top pipe 2, and at the same time generates continuous detection data corresponding to a certain point on the axis of the pipeline 2 in combination with the travel position of the mobile car 5. The data is identified and pre-processed by the information transmitter 4 and then sent to the host computer 6.

[0059] Preferably, the computer 6 integrates the leakage model of the whole section of the detection pipeline through BIM software. The radioactive element images distributed on the inner and outer walls of the top pipe 2 are removed, and only the radioactive element images within the thickness range of the top pipe 2 are retained, and finally the following is formed: Figure 4The real-time picture of any end face of the top pipe 2 shown can accurately locate the leakage point and crack path.

[0060] Thereby, the whole section detection of pipelines of various lengths and buried depths can be realized. Depending on the detection situation, the mobile vehicle 5 can be made to go back and forth for multiple times to collect information, and finally a more reasonable leakage model can be obtained.

[0061] like Figure 2 As shown, the present invention also designs a detection device for a top pipe leakage point, which is suitable for the above-mentioned top pipe leakage point detection method, including a mobile trolley 5, on which a nuclear probe 3 for detecting residual radioactive rays is fixed, and on which an information transmitter 4 for transmitting detection data to a host computer 6 is also fixed, and the nuclear probe 3 and the information transmitter 4 are electrically connected, and the mobile trolley 5, the nuclear probe 3 and the information transmitter 4 are respectively connected to the host computer 6.

[0062] Specifically, the mobile vehicle 5 , the nuclear probe 3 , and the information transmitter 4 are wirelessly connected to the computer 6 , respectively.

[0063] The invention performs detection by moving a small mobile vehicle inside the jacking pipe, is applicable to jacking pipes of various calibers, and avoids the disadvantage of manual crawling inside the jacking pipe for detection.

[0064] The method and device for detecting leakage points of jacking pipes of the present invention solve the problem that small leakage points of jacking pipes with great burial depths are difficult to accurately locate in functional tests, and are suitable for detecting leakage points of jacking pipes of various lengths, distances and burial depths.

[0065] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A method for detecting leakage points of jacking pipes, It is characterized in that The method comprises the following steps: S1) Filling the mixed liquid containing the radioactive isotope tracer into the top pipe (2) to be detected, and draining it after it is left to stand for a period of time; S2) establishing a three-dimensional model of the jacking pipe (2), and obtaining the relative position coordinates of each detection point relative to the center point of the jacking pipe (2) in a certain end face in combination with the trajectory of the axis line of the detection device in the three-dimensional model; S3) the detection device moves along the axial trajectory inside the top pipe (2) to perform circumferential detection on a certain end face, thereby obtaining radiation energy data corresponding to each detection point in the annular face; The detection device comprises a mobile trolley (5), a nuclear probe (3) for detecting residual radioactive rays is fixed on the mobile trolley (5), an information transmitter (4) for transmitting detection data to a host computer (6) is also fixed on the mobile trolley (5), the nuclear probe (3) and the information transmitter (4) are electrically connected, and the mobile trolley (5), the nuclear probe (3), and the information transmitter (4) are respectively connected to the host computer (6); S4) the detection device uploads the position coordinates of each detection point in a certain end face and the radiation energy data corresponding to each detection point to the upper computer (6), and the upper computer (6) integrates the obtained coordinates and energy data to present a radioactive detection distribution position map, wherein the radioactive detection distribution position map takes the center of the pipeline as the coordinate origin in a certain annular surface, displays the relative position relationship between the radiation points on the inner wall of the top pipe (2), the cracks in the pipe wall, and the outside of the cracks and the top pipe (2), and indicates the intensity of the radiation energy at a certain position by the depth of color; S5) The host computer (6) determines whether there is leakage crack in the pipeline according to the radioactive detection distribution position map; The method for the host computer (6) to determine whether there is leakage crack in the pipeline is: As the detection device continues to move and detect, the host computer (6) continuously collects detection data and eventually forms a leakage model of the top pipe (2). In the leakage model, the radioactive element images distributed on the inner wall of the top pipe (2) and the outside of the cracks are removed, and only the radioactive element images of the cracks in the wall of the top pipe (2) are retained, thereby obtaining the crack path and the coordinates of the leakage point.

2. The method for detecting a leakage point of a jacking pipe according to claim 1, Features: In step S1), the mixed solution is a radioactive isotope tracer and a test medium, water, and the radioactive isotope tracer is a hydrogen and oxygen isotope tracer.

3. The method for detecting a leakage point of a jacking pipe according to claim 2, Features: In step S1), during the static time, pressure can also be applied to the top pipe (2) to a set threshold value.

4. The method for detecting a leakage point of a jacking pipe according to claim 3, Features: In step S1), the end of the jacking pipe (2) is connected to a working well (1) leading to the ground.

5. The method for detecting a leakage point of a jacking pipe according to claim 4, Features: In step S3), the mobile vehicle (5) is an electrically driven remote-controlled walking device, and the control system of the mobile vehicle (5) is wirelessly connected to the host computer (6).

6. The method for detecting a pipe jacking leakage point according to claim 1, Features: In step S4), the host computer (6) presents a radioactive detection distribution location map through BIM software.

7. A device for detecting a leakage point of a jacking pipe, suitable for the method for detecting a leakage point of a jacking pipe as claimed in any one of claims 1 to 6, Features: The invention comprises a mobile trolley (5), on which a nuclear probe (3) for detecting residual radioactive rays is fixed, and on which an information transmitter (4) for transmitting detection data to a host computer (6) is also fixed, wherein the nuclear probe (3) and the information transmitter (4) are electrically connected, and the mobile trolley (5), the nuclear probe (3), and the information transmitter (4) are respectively connected to the host computer (6).

8. The device for detecting leakage points of jacking pipe according to claim 7, Features: The mobile vehicle (5), the nuclear probe (3), and the information transmitter (4) are respectively wirelessly connected to the computer (6).

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