CN116222903A - Detection method and detection device of pipe jacking leak point - Google Patents

Abstract

The invention discloses a detection method and a detection device for the leakage point of a pipe jacking. The method includes filling the mixed liquid containing radioactive isotope tracers into the pipe to be detected, and letting it stand for a period of time, then draining it; establishing a three-dimensional model of the pipe jacking, and combining the trajectory of the detection device's axis in the three-dimensional model to obtain each detection method. The relative position coordinates of the point relative to the center point of the pipe jacking in a certain end surface; the detection device moves along the axis trajectory inside the pipe jacking, and when the circular detection is performed on a certain end surface, the radiation energy corresponding to each detection point in the annulus is obtained Data; and upload the position coordinates and radiation energy data to the host computer, presenting a radiation detection distribution map; the host computer judges whether there are leakage cracks in the pipeline according to the radiation detection distribution map. The invention solves the problem that it is difficult to accurately locate small leakage points in the functional test of pipe jacking at large buried depths, and is suitable for detecting leakage points of pipe jacking with various lengths and distances and various buried depths.

Description

Detection method and detection device of pipe jacking leak point

technical field

The invention relates to the technical field of construction engineering, in particular to a detection method and a detection device for a leak point of a pipe jacking.

Background technique

Pipe jacking construction is a non-excavation construction method, which can cross roads, railways, rivers, ground buildings, underground structures and various underground pipelines. Pipe jacking construction is to use the jacking force generated by the jacking equipment in the working pit to overcome the friction between the pipeline and the surrounding soil, push the pipeline into the soil according to the designed slope, and transport the earth away.

The current technical specification requires that after the construction is completed, a functional test of the pipe jacking should be carried out. The test medium is generally water. If the indicators such as 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 judged to be qualified. If the indicators such as the amount of water seepage in the pipe jacking, the water pressure drop, and the water seepage of the outer wall of the pipe do not meet the requirements, the pipe jacking construction is judged to be unqualified. For unqualified pipe jacking, it is necessary to locate the location of the leakage point, and then take the next step of repairing measures.

In the prior art, there are noise storage method, endoscope method, tracer gas detection method, etc. for buried pipe leak detection methods, but the above three leak detection methods are applied to long-distance, large buried depth pipe jacking leakage points The detection has the following disadvantages:

Noise containment method: This method has certain requirements on the decibels of multiple noises. For pipes with large buried depths, it is difficult to collect the sound of water flow from the ground, and most of these pipes are water seepage, so the sound of water flow produced is relatively small, which is more difficult to collect position.

Endoscopic method: the endoscope in this method can only find larger gaps, but cannot find smaller gaps;

Tracer gas detection method: This method has a large spread range of tracer gas when the pipeline is buried deep, and the error is also large, and this method can only locate the approximate location of the leakage, and cannot locate the specific location of the leakage point .

Contents of the invention

In order to solve the above technical problems, the present invention proposes a detection method and detection device for pipe jacking leakage points, which solves the problem that it is difficult to accurately locate small leakage points in functional tests of pipe jacking at large buried depths.

In order to achieve the above object, a method for detecting a leakage point of pipe jacking designed by the present invention is particularly characterized in that the method includes the following steps:

S1) Fill the mixed solution containing the radioisotope tracer into the jacking pipe to be detected, let it stand for a period of time, and drain it;

S2) Establish a three-dimensional model of pipe jacking, in which the relative position coordinates of each detection point relative to the center point of pipe jacking in a certain end surface are obtained in conjunction with the trajectory of the detection device's axis of operation;

S3) The detection device moves along the axis trajectory inside the pipe jacking, and when performing circumferential detection on a certain end surface, obtains the radiation energy data corresponding to each detection point in the annulus;

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 host computer, and the host computer integrates the obtained coordinates and energy data to present a radiation detection distribution position map. The radiation detection distribution position diagram takes the center of the pipeline as the coordinate origin in a certain annulus, displays the relative positional relationship between the radiation points on the inner wall of the pipe jacking, the cracks on the pipe wall, and the radiation points outside the cracks, and the pipe jacking, and indicates the radiation energy at a certain position through the color depth strength;

S5) The host computer judges whether there is a leakage crack in the pipeline according to the radiation detection distribution position map.

Further, in step S1), the mixed solution is radioisotope tracer and test medium water, and the radioisotope tracer is hydrogen and oxygen isotope tracer.

Furthermore, in step S1), during the resting time, the pressure may also be applied to the inside of the jacking pipe up to a set threshold.

Furthermore, in step S1), the end of the pipe jacking is communicated with a working well leading to the ground.

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

Furthermore, in step S3), the mobile car is an electrically driven remote control walking device, and the mobile car control system is wirelessly connected to the host computer.

Further, in step S4), the host computer presents a radiation detection distribution location map through BIM software.

Further, in step S5), the method for the upper computer to judge whether there is a leakage crack in the pipeline is as follows:

As the detection device continues to move and detect, the host computer continuously collects detection data and finally forms a leak model of the pipe jacking. In the leakage model, the images of radioactive elements distributed on the inner wall of the pipe jacking and outside the cracks are removed, and only the pipe jacking is retained. Radioactive element images of pipe wall cracks to obtain crack paths and leak point coordinates.

The present invention also provides a detection device for the leakage point of pipe jacking, which is suitable for the detection method of the leakage point of pipe jacking. The nuclear probe, the mobile car is also fixed with an information transmitter for transmitting detection data to the host computer, the nuclear probe is electrically connected to the information transmitter, and the mobile car, the nuclear probe, and the information transmitter are respectively Connect with the host computer.

Further, the mobile car, the nuclear probe, and the information transmitter are respectively wirelessly connected to the computer.

The advantages of the present invention are:

1. The present invention uses radioactive isotope tracer mixed with water as the medium to carry out functional test on the pipe jacking. The mixed solution containing radioisotope tracer reaches the outer wall of the pipe jacking through the pipe wall crack, and leaves in the pipe wall crack. Isotopic tracer traces; the relative position coordinates of each detection point relative to the center point of the pipe jacking in a certain end surface are obtained through the established pipe jacking three-dimensional model, and the radiation energy intensity corresponding to each detection point in a certain annulus is obtained through the detection device. Weak; then upload the location coordinates of each detection point and the radiation energy data corresponding to each detection point to the host computer, presenting a map of the distribution of radiation detection, showing the relative relationship between the inner wall of the pipe jacking, the cracks in the pipe wall, and the radiation points outside the cracks and the pipe jacking. The positional relationship and the intensity of radiation energy at a certain position are indicated by the color depth, thus solving the problem that the leakage point is difficult to locate accurately in the current functional test of pipe jacking. Compared with the current underground pipeline leakage detection method on the market Close to practical application;

2. The invention continuously detects the inner wall of the pipe jacking, the cracks of the pipe wall, and the residual radioactive rays outside the cracks through the mobile trolley and the nuclear probe, and continuously uploads the position coordinates of different detection points and the corresponding radiation energy data to the host computer, and finally forms the jacking pipe. A leakage model, in which the images of radioactive elements distributed on the inner wall of the pipe jacking and outside the cracks are removed, and only the images of radioactive elements of the cracks on the wall of the pipe jacking are retained, so as to obtain the crack path and the coordinates of the leakage point;

3. The present invention promotes the penetration of the radioisotope tracer into the leakage gap on the wall of the pipe jacking by applying pressure to the pipe jacking or standing still, and solves the problem that the cracks are small and cannot be found;

4. The invention detects by moving the trolley in the pipe jacking, which is suitable for pipe jacking of various diameters and avoids the disadvantages of manual crawling in the pipe jacking;

The detection method and detection device of the pipe jacking leakage point of the present invention solve the problem that it is difficult to accurately locate the small leakage point in the functional test of the pipe jacking at a large buried depth, and are suitable for pipe jacking leakage of various lengths and distances and various buried depths point detection.

Description of drawings

Fig. 1 is the flowchart of detection method among the present invention;

Fig. 2 is the schematic diagram of detection device in the present invention during construction;

Fig. 3 is the radiation detection distribution position map on any end face of the pipe jacking in the present invention;

Fig. 4 is the seepage model of pipe jacking on any end face among the present invention;

In the figure: working well 1, pipe jacking 2, nuclear probe 3, information transmitter 4, mobile trolley 5, and host computer 6.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

In describing the present invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", The orientations or positional relationships indicated by "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than Nothing indicating or implying that a referenced device or element must have a particular orientation, be constructed, and operate in a particular orientation should therefore not be construed as limiting the invention.

As shown in Figure 1, the present invention proposes a kind of detection method of pipe jacking leak point, and described method comprises the steps:

S1) Fill the mixed solution containing the radioisotope tracer into the jacking pipe 2 to be detected, let it stand for a period of time, and drain it.

Specifically, the mixed liquid is a radioisotope tracer and test medium water, and the radioisotope tracer is a hydrogen and oxygen isotope tracer.

Preferably, during the standing time, the pressure can also be applied to the inside of the pipe jacking 2 up to a set threshold. Stand still or stabilize the pressure for a period of time according to the experimental requirements. During this period, if leakage occurs, the mixed solution containing the isotope tracer will reach the outer wall of the constructed pipeline 2 through the leakage point, leaving traces in the gap.

The pressure setting threshold is the value required by the pipeline functional test. In this embodiment, the setting threshold is 0.5 MPa, and the standing time is 0.5 hours after leakage is found.

The invention promotes the penetration of the radioactive isotope tracer into the gaps of the leakage points on the wall of the pipe jacking by applying pressure to the pipe jacking or standing still, and solves the problem that the cracks are small and cannot be found.

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

S2) Establish a three-dimensional model of the pipe jacking 2, in which the relative position coordinates of each detection point relative to the central point of the pipe jacking 2 within a certain end surface are obtained in combination with the trajectory of the detection device's running axis.

S3) The detection device moves along the axis trajectory inside the pipe jacking 2, and when the circular detection is performed on a certain end surface, the radiation energy data corresponding to each detection point in the circular surface is obtained.

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

Preferably, the mobile trolley 5 is an electrically driven remote control walking device, and the control system of the mobile trolley 5 is wirelessly connected to the host computer 6 .

Put the mobile trolley 5 into the jacking pipe 2, travel along the bottom of the jacking pipe 2, take the forward and return as a detection, during the detection process of the mobile trolley 5, the nuclear probe 3 fixed on the mobile trolley 5 continuously detects the residual radioactivity The ray traces the coordinate position and radiant energy of the radioactive elements on the inner wall, outer wall of the jacking pipe 2, and the gap of the leakage point.

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

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 host computer 6, and the host computer 6 integrates the obtained coordinates and energy data to present a radiation detection distribution position map, The radiation detection distribution position map takes the center of the pipeline as the coordinate origin in a certain annulus, displays the relative positional relationship between the inner wall of the pipe jacking 2, the cracks in the pipe wall, and the radiation points outside the cracks, and the pipe jacking 2, and expresses a certain position through the color depth. The radiation energy of the location is strong or weak.

Preferably, the host computer 6 presents a radiation detection distribution map through BIM software.

BIM (English name: Building Information Modeling) building information model is a building or building engineering information model that is composed of sufficient information to support new product development management and can be directly interpreted by computer applications, that is, the life of the building environment supported by digital technology. cycle management.

After the information is collected and processed on the inner wall of the pipe jacking 2, the cracks on the pipe wall, and the residual radioactive rays outside the cracks, the real-time position of the moving car 5 is transmitted to the host computer 6, and a screen as shown in Figure 3 is formed on any end surface of the jacking pipe 2 , that is, a radioactive element distribution model is presented on either end surface of the jack pipe 2 .

S5) The host computer 6 judges whether there is a leakage crack in the pipeline according to the radiation detection distribution map.

Specifically, the host computer 6 judges whether there is a method for leaking cracks in the pipeline as follows:

With the continuous movement and detection of the detection device, the host computer 6 continuously collects detection data and finally forms a leakage model of the pipe jacking 2. In the leakage model, the images of radioactive elements distributed on the inner wall of the pipe jacking 2 and the outside of the crack are removed, and only The radioactive element images of the cracks in the pipe wall of pipe jacking 2 are preserved, so as to obtain the crack path and the coordinates of the leakage point.

The nuclear probe 3 continuously detects the β-rays emitted by the residual isotope tracer on the inner wall, outer wall, and gaps of the pipe jacking 2, and at the same time generates continuous detection data corresponding to a certain point on the axis of the pipe 2 in combination with the travel position of the mobile car 5. The information transmitter 4 sends it to the host computer 6 after identifying the preprocessing.

Preferably, the computer 6 is integrated with BIM software to form a leakage model of the entire detection pipeline. Remove the images of radioactive elements distributed on the inner and outer walls of the pipe jacking 2, and only keep the images of radioactive elements within the wall thickness of the pipe jacking 2, and finally form a real-time picture of any end face of the pipe jacking 2 as shown in Figure 4, and accurately locate the leakage point locations and crack paths,

In this way, the inspection of the entire section of pipelines with various lengths and buried depths can be realized, and the mobile car 5 can also be used to collect information multiple times depending on the inspection situation, and finally a more reasonable leakage model can be obtained.

As shown in Figure 2, the present invention also designs a detection device for the leakage point of pipe jacking, which is suitable for the above-mentioned detection method of leakage point of pipe jacking, and includes a mobile trolley 5, which is fixed with a The nuclear probe 3 of radioactive rays, the mobile trolley 5 is also fixed with an information transmitter 4 for transmitting detection data to the host computer 6, the nuclear probe 3 is electrically connected to the information transmitter 4, and the mobile trolley 5 , the nuclear probe 3 and the information transmitter 4 are connected to the host computer 6 respectively.

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

The invention detects by moving a trolley in the pipe jacking, is suitable for pipe jacking of various calibers, and avoids the disadvantage of artificial crawling in the pipe jacking detection.

The detection method and detection device of the pipe jacking leakage point of the present invention solve the problem that it is difficult to accurately locate the small leakage point in the functional test of the pipe jacking at a large buried depth, and are suitable for pipe jacking leakage of various lengths and distances and various buried depths point detection.

Obviously, those skilled in the art can make various changes and modifications to the application without departing from the spirit and scope of the application. In this way, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these modifications and variations.

Claims (10)

1. a detection method of pipe jacking leak point, is characterized in that, described method comprises the steps: S1) Fill the mixed solution containing the radioisotope tracer into the jacking pipe (2) to be detected, and let it stand for a period of time before draining; S2) Establishing a three-dimensional model of the pipe jacking (2), in which the relative position coordinates of each detection point relative to the center point of the pipe jacking (2) in a certain end surface are obtained in combination with the running axis trajectory of the detection device; S3) The detection device moves along the axis trajectory inside the jacking pipe (2), and when performing circumferential detection on a certain end surface, obtains the radiation energy data corresponding to each detection point in the annulus; S4) The detection device uploads the position coordinates of each detection point in a certain end surface and the radiation energy data corresponding to each detection point to the host computer (6), and the host computer (6) integrates the obtained coordinates and energy data to present a radiation detection The distribution position map, the radiation detection distribution position map takes the pipeline center as the coordinate origin in a certain annulus, and shows the relative position of the pipe jacking (2) inner wall, pipe wall cracks and radiation points outside the cracks and the pipe jacking (2) relationship and express the intensity of radiated energy at a certain position through the depth of the color; S5) The upper computer (6) judges whether there is a leakage crack in the pipeline according to the radiation detection distribution position map. 2. the detection method of pipe jacking leak point according to claim 1, is characterized in that: in step S1), described mixed solution is radioisotope tracer and test medium water, and described radioisotope tracer is Hydroxygen isotope tracers. 3. The method for detecting leakage points of pipe jacking according to claim 2, characterized in that: in step S1), during the standing time, pressure can also be applied to the pipe jacking (2) to a set threshold. 4. The method for detecting leakage points of pipe jacking according to claim 3, characterized in that in step S1), the end of the pipe jacking (2) is connected to a working well (1) leading to the ground. 5. The detection method of the pipe jacking leak point according to claim 1, characterized in that: in step S3), the detection device comprises a mobile trolley (5), on which a mobile trolley (5) is fixed with a The nuclear probe (3) of residual radioactive rays, the mobile trolley (5) is also fixed with an information transmitter (4) for transmitting detection data to the host computer (6), and the nuclear probe (3) and the information transmitter (4) are electrically connected, and the mobile car (5), the nuclear probe (3), and the information transmitter (4) are connected to the host computer (6) respectively. 6. The method for detecting leakage points of pipe jacking according to claim 5, characterized in that: in step S3), the mobile trolley (5) is an electric-driven remote control walking device, and the mobile trolley (5) controls the system Connect wirelessly with the host computer (6). 7. The method for detecting leakage points of pipe jacking according to claim 1, characterized in that: in step S4), the host computer (6) presents a radiation detection distribution position map through BIM software. 8. the detection method of pipe jacking leak point according to claim 1, is characterized in that, in step S5), the method that host computer (6) judges whether there is leakage crack in pipeline is: As the detection device continues to move and detect, the host computer (6) continuously collects detection data and finally forms a leakage model of the pipe jacking (2). Only the radioactive element images of the pipe wall cracks of the pipe jacking (2) are kept, so as to obtain the crack path and the coordinates of the leakage point. 9. A detection device for a leak point of pipe jacking, suitable for the detection method of a leak point of pipe jacking as claimed in any one of claims 1 to 8, characterized in that: it includes a moving trolley (5), the moving A nuclear probe (3) for detecting residual radioactive rays is fixed on the trolley (5), and an information transmitter (4) for transmitting detection data to the host computer (6) is also fixed on the mobile trolley (5). The nuclear probe (3) is electrically connected to the information transmitter (4), and the mobile cart (5), the nuclear probe (3) and the information transmitter (4) are respectively connected to the host computer (6). 10. The detection device for the leakage point of pipe jacking according to claim 9, characterized in that: the mobile trolley (5), the nuclear probe (3), and the information transmitter (4) are wirelessly connected to the computer (6) respectively .

Images