阅读说明：本技术 管道泄漏检测方法、检测系统及施工方法 (Pipeline leakage detection method, detection system and construction method ) 是由 郭彦明 于 2021-09-15 设计创作，主要内容包括：本发明提供了一种管道泄漏检测方法、检测系统及施工方法,涉及长输管道检测技术领域,包括获取补水管道的补水参数,当补水参数超出第一预设范围,控制器发送测温控制指令；当温度参数超出第二预设范围,获取分支管道多个点位的振动参数,并判断分支管道的初判泄漏点。本发明提供的管道泄漏检测方法,当补水参数超过第一预设范围时,可知管道出现漏水情况,控制器发送测温控制指令以获得主管道下方多个预测点位的温度参数,控制器判断上述温度参数若处于第二预设范围,可知主管道下方无高温水泄漏,之后获取分支管道的振动参数并判断分支管道的初判漏水点,上述检测方法可精准判断管道的漏水情况,提高了检测的精准度。(The invention provides a pipeline leakage detection method, a detection system and a construction method, which relate to the technical field of long-distance pipeline detection and comprise the steps of obtaining water supplement parameters of a water supplement pipeline, and sending a temperature measurement control instruction by a controller when the water supplement parameters exceed a first preset range; and when the temperature parameter exceeds a second preset range, acquiring vibration parameters of a plurality of point positions of the branch pipeline, and judging an initial judgment leakage point of the branch pipeline. According to the pipeline leakage detection method provided by the invention, when the water supplement parameter exceeds the first preset range, the water leakage condition of the pipeline can be known, the controller sends the temperature measurement control instruction to obtain the temperature parameters of the plurality of prediction points below the main pipeline, if the temperature parameters are judged to be in the second preset range, the controller can know that no high-temperature water leaks below the main pipeline, then the vibration parameters of the branch pipeline are obtained, and the initial water leakage judging point of the branch pipeline is judged.)

1. The pipeline leakage detection method is characterized by comprising the following steps:

s100, acquiring water replenishing parameters of a water replenishing pipeline, and transmitting the water replenishing parameters to a controller, wherein the controller judges whether the water replenishing parameters are in a first preset range according to a first preset program;

when the water supplementing parameter is in the first preset range, judging that the main pipeline and the branch pipeline are not leaked; when the water supplementing parameter exceeds the first preset range, the controller sends a temperature measurement control instruction;

s200, acquiring temperature parameters of a plurality of preset point positions below the main pipeline, and transmitting the temperature parameters to the controller, wherein the controller judges whether the temperature parameters are in a second preset range according to a second preset program;

when the temperature parameter is in the second preset range, judging that the main pipeline has no leakage; when the temperature parameter exceeds the second preset range, the controller sends a vibration measurement control instruction;

s300, obtaining vibration parameters of a plurality of point positions of the branch pipeline, transmitting the vibration parameters to the controller, and judging the initial leakage point of the branch pipeline by the controller according to the vibration parameters.

2. The pipe leakage detecting method according to claim 1, wherein after the step S300, the pipe leakage detecting method further comprises:

s400: acquiring noise parameters of a plurality of point positions of the branch pipeline, and transmitting the noise parameters to the controller, wherein the controller judges rechecking leakage points of the branch pipeline according to the noise parameters;

and the controller compares whether the initial judgment leakage point is consistent with the rechecking leakage point or not according to a third preset program, and if the initial judgment leakage point is consistent with the rechecking leakage point, the controller judges that the consistent point is the final leakage point of the branch pipeline.

3. The pipe leak detection method according to claim 2, wherein after completing step 400 and repairing the branch pipe, step S100 is repeated until the water replenishment parameter is within the first preset range.

4. A pipe leak detection system, comprising:

the temperature measuring optical cable is arranged below the main pipeline, extends along the axial direction of the main pipeline and is used for monitoring temperature parameters of a plurality of point positions on the main pipeline;

the vibration sensors are respectively arranged on the outer walls of the branch pipelines and used for monitoring vibration parameters of the branch pipelines;

a controller electrically connected to the thermometric optical cable and the vibration sensor, respectively, the controller being configured to perform the method of any of claims 1-3.

5. The pipeline leakage detection system of claim 4, wherein the temperature measurement optical cable comprises an optical fiber core, a threaded telescopic hose, an aramid fiber pipe, a woven mesh sleeve and an anticorrosive flame-retardant sleeve which are sequentially arranged from inside to outside, and the threaded telescopic hose and the woven mesh sleeve are stainless steel components respectively.

6. The pipe leak detection system of claim 4, further comprising:

noise detection optic fibre, with the controller electricity is connected with transmission noise signal extremely in the controller, noise detection optic fibre's tip is equipped with first sensing interface, is equipped with the second sensing interface on the periphery wall, noise detection optic fibre follows the periphery wall of lateral conduit extends.

7. A construction method for laying and installing the pipe leak detection system according to any one of claims 4 to 6, comprising the steps of:

excavating a main groove and branch grooves, wherein the excavation depth of the main groove is greater than the buried depth of the main pipeline by 0.1-0.3 m;

laying a temperature measuring optical cable to the main groove, and backfilling sand grains with the thickness of 0.1-0.3 m to the main groove to form a sand grain layer;

laying the main pipeline to the position above the sand layer;

mounting a plurality of vibration sensors to the peripheral wall of the branch pipe and electrically connecting the vibration sensors and the controller;

and laying the branch pipeline into the branch trench.

8. The construction method according to claim 7, wherein in the step of mounting the vibration sensors on the peripheral wall of the branch pipe, a plurality of the vibration sensors are sequentially arranged at equal intervals in the axial direction of the branch pipe, and adjacent two of the vibration sensors are staggered at right-angle angles in the circumferential direction.

9. The construction method according to claim 8, wherein after mounting a plurality of vibration sensors to the peripheral wall of the branch pipe, vibration optical fibers extending in the axial direction of the branch pipe are mounted to the bottom of the branch pipe, and branch optical fibers for connecting the vibration sensors and the branch pipe are provided in the circumferential direction of the branch pipe, the branch optical fibers corresponding to the vibration sensors one-to-one.

10. The construction method according to claim 9, wherein a noise detecting optical fiber is installed to an upper portion of the branch pipe before the step of laying the branch pipe into the branch trench, the noise detecting optical fiber extending in an axial direction of the branch pipe.

Technical Field

The invention belongs to the technical field of long-distance pipeline detection, and particularly relates to a pipeline leakage detection method, a detection system and a construction method.

Background

At present, a lot of cities use the waste heat of power stations to carry out heating and heat supply of the cities, and long-distance conveying pipelines need to be arranged. The pipeline in general pipe network is in the underground of city, and the external environment is relatively complicated, when carrying out the ground excavation operation, the leakage accident that the mistake was dug and is caused appears easily. In addition, erosion of the external environment also easily causes leakage of individual points of the heat supply pipeline, which not only affects heat supply of related areas, but also causes great influence on the surrounding environment.

In the prior art, a thermal inspection chamber is mostly adopted to monitor certain positions of a pipeline, but the mode can only monitor local point positions and is difficult to monitor the whole network without blind areas, so that the leakage detection of the pipeline is always a difficult point in the safe operation process of the pipeline.

Disclosure of Invention

The invention aims to provide a pipeline leakage detection method, a pipeline leakage detection system and a pipeline leakage construction method, which can effectively and comprehensively monitor a heat supply pipeline and improve the safety of pipeline operation.

In order to achieve the purpose, the invention adopts the technical scheme that: provided is a pipeline leakage detection method, comprising the following steps:

s100, acquiring water replenishing parameters of a water replenishing pipeline, transmitting the water replenishing parameters to a controller, and judging whether the water replenishing parameters are in a first preset range by the controller according to a first preset program;

when the water replenishing parameters are in a first preset range, judging that the main pipeline and the branch pipelines are not leaked; when the water replenishing parameter exceeds a first preset range, the controller sends a temperature measurement control instruction;

s200, acquiring temperature parameters of a plurality of preset point positions below the main pipeline, transmitting the temperature parameters to a controller, and judging whether the temperature parameters are in a second preset range by the controller according to a second preset program;

when the temperature parameter is in a second preset range, judging that the main pipeline has no leakage; when the temperature parameter exceeds a second preset range, the controller sends a vibration measurement control instruction;

s300, obtaining vibration parameters of a plurality of point positions of the branch pipeline, transmitting the vibration parameters to the controller, and judging the initial leakage point of the branch pipeline by the controller according to the vibration parameters.

In a possible implementation manner, concurrently with the step S300, the method for detecting a pipeline leakage further includes:

s400: acquiring noise parameters of a plurality of point positions of the branch pipeline, transmitting the noise parameters to a controller, and judging rechecking leakage points of the branch pipeline by the controller according to the noise parameters;

and the controller compares whether the initial judgment leakage point is consistent with the rechecking leakage point or not according to a third preset program, and if the initial judgment leakage point is consistent with the rechecking leakage point, the consistent point is judged to be the final leakage point of the branch pipeline.

In some embodiments, after completing step 400 and repairing the branch pipeline, step S100 is repeated until the water supplement parameter is within the first preset range.

The invention also provides a pipeline leakage detection system, comprising:

the temperature measuring optical cable is arranged below the main pipeline, extends along the axial direction of the main pipeline and is used for monitoring temperature parameters of a plurality of point positions on the main pipeline;

the vibration sensors are respectively arranged on the outer walls of the branch pipelines and used for monitoring vibration parameters of the branch pipelines;

and the controller is electrically connected with the temperature measuring optical cable and the vibration sensor respectively and is used for executing the pipeline leakage detection method.

In a possible implementation mode, the temperature measuring optical cable comprises an optical fiber core, a threaded telescopic hose, an aramid fiber pipe, a woven net sleeve and an anti-corrosion flame-retardant sleeve which are sequentially arranged from inside to outside, wherein the threaded telescopic hose and the woven net sleeve are stainless steel components respectively.

In one possible implementation, the pipe leak detection system further includes:

the noise detection optical fiber is electrically connected with the controller to transmit a noise signal to the controller, a first sensing interface is arranged at the end part of the noise detection optical fiber, a second sensing interface is arranged on the peripheral wall of the noise detection optical fiber, and the noise detection optical fiber extends along the peripheral wall of the branch pipeline.

The invention also provides a construction method for the distributed and installed pipeline leakage detection system, which is characterized by comprising the following steps:

excavating a main groove and branch grooves, wherein the excavation depth of the main groove is greater than the buried depth of the main pipeline by 0.1-0.3 m;

laying a temperature measuring optical cable to the main groove, and backfilling sand grains with the thickness of 0.1-0.3 m to the main groove to form a sand grain layer;

laying a main pipeline to the position above the sand grain layer;

mounting a plurality of vibration sensors on the peripheral wall of the branch pipeline, and electrically connecting the vibration sensors and the controller;

and laying branch pipelines into the branch trenches.

In one possible implementation manner, in the step of mounting the vibration sensors on the peripheral wall of the branch pipe, the plurality of vibration sensors are sequentially arranged at equal intervals in the axial direction of the branch pipe, and two adjacent vibration sensors are staggered by a right-angle included angle in the circumferential direction.

In some embodiments, after mounting the plurality of vibration sensors to the circumferential wall of the branch pipe, a vibration optical fiber extending in the axial direction of the branch pipe is mounted at the bottom of the branch pipe, and branch optical fibers for connecting the vibration sensors and the branch pipe are provided in the circumferential direction of the branch pipe, the branch optical fibers corresponding to the vibration sensors one-to-one.

In some embodiments, before the step of laying the branch pipe into the branch trench, a noise detection optical fiber is installed to an upper portion of the branch pipe, the noise detection optical fiber extending in an axial direction of the branch pipe.

The scheme shown in the embodiment of the application, compared with the prior art, the scheme shown in the embodiment of the application, when moisturizing parameter surpasss first preset scope, can know that the condition of leaking appears in the pipeline, the controller sends the temperature measurement control command in order to obtain the temperature parameter of a plurality of prediction positions in trunk line below, the controller judges above-mentioned temperature parameter if be in the second preset scope, can know that the trunk line below does not have the high-temperature water to leak, need further to acquire the vibration parameter of lateral conduit, and judge the initial water leakage point of lateral conduit according to this, so that carry out the pertinence and repair, above-mentioned detection method can accurately judge the condition of leaking of trunk line and lateral conduit, the effectual precision that has improved the detection.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

FIG. 1 is a schematic flow chart of a method for detecting pipeline leakage according to an embodiment of the present invention;

fig. 2 is a schematic cross-sectional structural diagram of a laying state of a main pipeline provided by an embodiment of the invention;

FIG. 3 is a schematic left-side sectional view of the temperature measuring cable in FIG. 2 according to the embodiment of the present invention

FIG. 4 is a schematic structural diagram of a branch pipe according to an embodiment of the present invention;

fig. 5 is a schematic partial enlarged structure diagram of fig. 4.

Wherein, in the figures, the respective reference numerals:

1. a main pipeline; 11. a sand layer; 2. a branch pipe; 3. a temperature measuring optical cable; 31. an optical fiber core; 32. a threaded flexible hose; 33. aramid fiber tubes; 34. weaving a net sleeve; 35. an anticorrosive flame-retardant sleeve; 4. a vibration sensor; 41. vibrating the optical fiber; 42. a branched optical fiber; 5. a noise detection optical fiber; 51. a first sensing interface; 52. a second sensing interface.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or be indirectly on the other element. It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be constructed in a particular operation, and are therefore not to be considered limiting. The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or several of that feature. In the description of the present invention, "a number" means two or more unless specifically limited otherwise.

Referring to fig. 1, a method, a system and a method for detecting pipeline leakage according to the present invention will now be described. The pipeline leakage detection method comprises the following steps:

s100, acquiring water replenishing parameters of a water replenishing pipeline, transmitting the water replenishing parameters to a controller, and judging whether the water replenishing parameters are in a first preset range by the controller according to a first preset program;

when the water supplementing parameter is in a first preset range, judging that the main pipeline 1 and the branch pipelines 2 have no leakage; when the water replenishing parameter exceeds a first preset range, the controller sends a temperature measurement control instruction;

s200, acquiring temperature parameters of a plurality of preset point positions below the main pipeline 1, transmitting the temperature parameters to a controller, and judging whether the temperature parameters are in a second preset range by the controller according to a second preset program;

when the temperature parameter is in a second preset range, judging that the main pipeline 1 has no leakage; when the temperature parameter exceeds a second preset range, the controller sends a vibration measurement control instruction;

s300, obtaining vibration parameters of a plurality of point positions of the branch pipeline 2, transmitting the vibration parameters to the controller, and judging the initial leakage point of the branch pipeline 2 by the controller according to the vibration parameters.

Compared with the prior art, the pipeline leakage detection method provided by the embodiment comprises the steps that when water supplement parameters exceed a first preset range, the situation of water leakage of a pipeline can be known, the controller sends a temperature measurement control instruction to obtain temperature parameters of a plurality of prediction point positions below a main pipeline 1, the controller judges whether the temperature parameters are in a second preset range, it can be known that high-temperature water does not leak below the main pipeline 1, the vibration parameters of a branch pipeline 2 need to be further obtained, and accordingly the initial water leakage point of the branch pipeline 2 is judged, so that targeted repair can be carried out, the detection method can accurately judge the water leakage situations of the main pipeline 1 and the branch pipeline 2, and the detection accuracy is effectively improved.

In a possible implementation manner, concurrently with the step S300, the method for detecting a pipeline leakage further includes:

s400: acquiring noise parameters of a plurality of point positions of the branch pipeline 2, transmitting the noise parameters to a controller, and judging rechecking leakage points of the branch pipeline 2 by the controller according to the noise parameters;

and the controller compares whether the initial-judgment leakage point is consistent with the recheck leakage point or not according to a third preset program, and if the initial-judgment leakage point is consistent with the recheck leakage point, the consistent point is judged to be the final leakage point of the branch pipeline 2.

And after the step 400 is completed and the branch pipeline is repaired, repeating the step S100 until the water supplementing parameter is within a first preset range.

When it is determined that the branch pipe 2 leaks water, in order to further confirm the water leakage of the branch pipe 2, the vibration parameter of the branch pipe 2 is measured, and then the noise parameter of the branch pipe 2 is measured. When the rechecking leakage point of noise parameter feedback and the initial leakage point of vibration parameter feedback are consistent, the specific position of the leakage point of the branch pipeline 2 is determined, the detection accuracy can be effectively improved by the operation, the working hour loss caused by detection errors is avoided, meanwhile, the influence of road excavation on the trip of urban residents is also reduced, the repair of the leakage point is convenient to timely carry out, and the accident handling speed is effectively improved.

When the initial leakage point and the rechecking leakage point are inconsistent, the vibration parameter and the noise parameter are repeatedly acquired until the initial leakage point and the rechecking leakage point are consistent, the final leakage point is judged, the misjudgment caused by detection errors is avoided, and the accurate detection effect is achieved.

And after the branch pipeline 2 is repaired, the step S100 is carried out again to recheck that the whole pipeline has no leakage problem and ensure the thoroughness of maintenance.

Referring to fig. 2 to 5, the present invention further provides a pipeline leakage detection system, which includes a temperature measuring optical cable 3, a plurality of vibration sensors 4 and a controller; the temperature measuring optical cable 3 is arranged below the main pipeline 1, extends along the axial direction of the main pipeline 1 and is used for monitoring temperature parameters of a plurality of point positions on the main pipeline 1; the vibration sensors 4 are respectively arranged on the outer wall of the branch pipeline 2 and used for monitoring vibration parameters of the branch pipeline 2; the controller is respectively and electrically connected with the temperature measuring optical cable 3 and the vibration sensor 4, and the controller is used for executing the pipeline leakage detection method.

The temperature measuring optical cable 3 is arranged below the main pipeline 1, and the temperature measuring optical cable 3 extends along the axial direction of the main pipeline 1 and keeps the same walking path with the main pipeline 1. Temperature measurement optical cable 3 can record the temperature parameter of a plurality of positions in trunk line 1 below to accurate discernment temperature variation exceeds the temperature difference abnormal point position of the second predetermined scope, and then carries out effectual discernment to trunk line 1 upper leakage point, with the effectual locking of leakage point behind trunk line 1, can omit follow-up detection to branch pipeline 2.

When the temperature parameters measured by the temperature measuring optical cable 3 are all in the second preset range, it is proved that the main pipeline 1 has no leakage point, and the vibration condition of the branch pipeline 2 needs to be monitored by the vibration sensor 4 at the moment. The plurality of vibration sensors 4 arranged on the outer wall of the branch pipeline 2 can effectively monitor the vibration parameters of the branch pipeline 2, judge the leakage condition of high-temperature water at each point position of the branch pipeline 2 through the controller and judge the initial judgment leakage point.

The vibration that rivers disturbance produced can appear when having high temperature water to leak on the lateral conduit 2, but the vibration sensor 4 set up the vibration condition of 2 each positions of accurate detection lateral conduit, and then the accurate leakage condition of judging lateral conduit 2 to the processing is repaired to the pertinence.

In some possible implementations, the temperature measuring cable 3 with the above-mentioned characteristics adopts the structure shown in fig. 3. Referring to fig. 3, the temperature measuring optical cable 3 includes an optical fiber core 31, a threaded flexible tube 32, an aramid fiber tube 33, a woven mesh 34 and an anticorrosive flame-retardant sleeve 35, which are sequentially arranged from inside to outside, and the threaded flexible tube 32 and the woven mesh 34 are stainless steel members respectively.

The optical fiber core body 31 of the temperature measurement optical cable 3 is used for monitoring the temperature parameter below the main pipeline 1, the threaded telescopic hose 32 has certain flexibility, and can be matched with the lifting of a soil layer to bend to a certain extent so as to effectively protect an optical fiber body. Anticorrosive fire-retardant sleeve pipe 35 can be with the effectual isolation of optical fiber core 31 and external environment, when contacting with moist soil, also can keep good dry state, guarantees optical fiber core 31's normal condition, avoids external environment's harmful effects.

The aramid fiber tube 33 is made of aramid fiber material, which is originally named as poly-p-phenylene terephthalamide, and has the advantages of low density, high strength, good toughness, high temperature resistance, easy processing and forming, the strength of the aramid fiber tube is 5 times of that of steel with the same mass, and the density of the aramid fiber tube is only one fifth of that of the steel. The tough and wear-resistant material can play a good role in protecting the optical fiber core 31.

In some possible implementations, the characteristic noise detection fiber 5 is configured as shown in fig. 4 and 5. Referring to fig. 4 and 5, the pipe leakage detecting system further includes a noise detecting optical fiber 5, the noise detecting optical fiber 5 is electrically connected to the controller to transmit a noise signal to the controller, a first sensing port 51 is provided at an end of the noise detecting optical fiber 5, a second sensing port 52 is provided on an outer circumferential wall of the noise detecting optical fiber 5, and the noise detecting optical fiber 5 extends along the outer circumferential wall of the branch pipe 2.

The first sensing interface 51 is located at the end of the noise detection optical fiber 5, the second sensing interface 52 is located at the side of the noise detection optical fiber 5, a noise disturbance signal caused by pipeline leakage can generate an interference signal to the noise detection optical fiber 5, the interference signal is transmitted through the first sensing interface 51 or the second sensing interface 52 and is transmitted to the controller, the controller can identify and judge the occurrence point of noise, and then the leakage point is determined according to the noise position.

The noise detection optical fiber 5 can effectively detect the noise condition of the branch pipeline 2, and the first sensing interface 51 and the second sensing interface 52 arranged on the noise detection optical fiber 5 are respectively connected with the controller, so that the noise parameters can be conveniently conveyed into the controller. The noise detection optical fiber 5 is located at the periphery of the upper part of the branch pipeline 2, can effectively detect the noise condition of the peripheral wall of the branch pipeline 2, further confirms the position of the leakage point on the branch pipeline 2, rechecks the position of the leakage point with the position of the initial judgment leakage point judged according to the vibration parameter, and further judges the final leakage point, and has good accuracy.

The noise detection optical fiber 5 adopts an optical fiber sensing technology, which is a new sensing technology along with the development of optical fiber and optical fiber communication technology, and the optical fiber sensing technology directly uses optical fiber as a sensor. The vibration sensor 4 is essentially different from an electrical-based sensor, and the vibration sensor 4 uses light as a carrier of sensitive information and optical fiber as a medium for transmitting the sensitive information. The combination of two detection means of dielectric medium and light medium has been realized to the combined use of vibration sensor 4 and noise detection optic fibre 5, can effectual improvement detect the precision, avoids judging the too much interference that the mistake caused the municipal administration because of the leakage point.

The invention also provides a construction method for the distributed and installed pipeline leakage detection system, which is characterized by comprising the following steps:

excavating a main groove and branch grooves, wherein the excavation depth of the main groove is 0.1-0.3 m greater than the burial depth of the main pipeline 1;

laying a temperature measuring optical cable 3 to the main groove, and backfilling sand grains with the thickness of 0.1-0.3 m to the main groove to form a sand grain layer 11;

laying the main pipeline 1 to the position above the sand grain layer 11;

mounting a plurality of vibration sensors 4 to the peripheral wall of the branch pipe 2, and electrically connecting the vibration sensors 4 and the controller;

laying the branch pipes 2 into the branch trenches.

In some possible implementations, the characteristic vibration sensor 4 is configured as shown in fig. 4. Referring to fig. 4, in the step of mounting the vibration sensors 4 to the circumferential wall of the branch pipe 2, the plurality of vibration sensors 4 are sequentially arranged at equal intervals in the axial direction of the branch pipe 2, and two adjacent vibration sensors 4 are staggered at right-angle angles in the circumferential direction.

After mounting the plurality of vibration sensors 4 to the circumferential wall of the branch pipe 2, a vibration optical fiber 41 extending in the axial direction of the branch pipe is mounted at the bottom of the branch pipe 2, and branch optical fibers 42 for connecting the vibration sensors 4 and the branch pipe 2 are provided in the circumferential direction of the branch pipe 2, the branch optical fibers 42 corresponding one-to-one to the vibration sensors 4.

The vibration sensor 4 is connected with the vibration optical fiber 41 through the branch optical fiber 42, the detected vibration parameter data is transmitted to the vibration optical fiber 41, the vibration optical fiber 41 is connected with the controller, the continuity of signal transmission is ensured, and the connection effect is more reliable compared with wireless transmission.

When the temperature parameter detected by the temperature measuring optical cable 3 is in a second preset range, the main pipeline 1 is proved to have no leakage point. At this moment, the controller passes through vibration sensor 4 and acquires vibration parameter, and vibration parameter reflects the vibration frequency of lateral conduit 2, and vibration parameter surpasss normal scope and also is the great position of vibration amplitude for just judging the leak point, and above-mentioned detection mode can be effectual on the monitoring lateral conduit 2 just judge the leak point, and the precision of effectual improvement detection is convenient for accurately judge the leak point to carry out the maintenance of pertinence.

In some embodiments, the characteristic noise detection fiber 5 may be configured as shown in fig. 4. Referring to fig. 4, before the step of laying the branch pipe 2 into the branch trench, a noise detecting optical fiber 5 is installed onto the branch pipe 2, the noise detecting optical fiber 5 extending in the axial direction of the branch pipe 2. After the step of attaching the noise detection optical fiber 5 to the branch pipe 2, the branch optical fibers 42 respectively extending toward the vibration sensors 4 are connected to the noise detection optical fiber 5, and the branch optical fibers 42 correspond one-to-one to the vibration sensors 4.

Noise detection optical fiber 5 can carry out further detection to the noise condition of lateral conduit 2, and noise detection optical fiber 5 is located the upper portion of lateral conduit 2, and radiates to the different positions of lateral conduit 2 periphery wall through branch optic fibre 42, keeps the state that sets up with vibration sensor 4 one-to-one and adjacent, is convenient for realize that follow-up just judges the uniformity ratio between leakage point and the recheck leakage point, guarantees the accuracy nature of final leakage point.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.