A system and method for detecting the distribution of pipe jacking lubrication slurry fluid

Abstract

The application discloses a kind of pipe lubricating slurry fluid distribution detection systems and methods, it is related to fluid distribution detection technical field, the present application includes marking unit and acquisition unit, it is characterized in that, the output end of marking unit is connected with acquisition unit input end, marking unit is set on the slurry pump export pipeline of ground slurry mixing station, for even mixing into conductive tracer particle to injected slurry, the output end of marking unit is communicated with the detection area of acquisition unit by grouting pipeline, slurry is after flowing through the pipe section where acquisition unit is located in during injection process, enters annular gap outside pipe wall, the present application can directly obtain the volume fraction distribution image of slurry in annular gap outside pipe wall from inside pipe by mixing into conductive tracer particle in slurry and cooperating with annular electromagnetic wave array scanning, so that actual distribution state after slurry injection can be presented, so that construction personnel can directly see the distribution condition of slurry in each orientation.

Description

Technical Field

[0001] This invention belongs to the field of fluid distribution detection technology, and in particular relates to a fluid distribution detection system and method for pipe jacking lubrication mud. Background Technology

[0002] Pipe jacking is a trenchless underground pipeline laying technology. The jacking machine cuts the soil in front, and the hydraulic jacks behind push the pipe sections into the ground one by one to form a continuous underground pipeline. During the jacking process, an annular gap will be formed between the outer wall of the pipe section and the surrounding soil, and special lubricating mud needs to be injected into the gap.

[0003] In existing pipe jacking lubrication mud injection technology, the actual distribution of mud in the annular gap on the outside of the pipe wall cannot be directly known, the lubrication effect lacks quantitative evaluation indicators, and the slurry replenishment operation can only be carried out in a rough manner based on the operator's experience, and it is impossible to achieve precise positioning and quantitative slurry replenishment. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a system and method for detecting the fluid distribution of lubricating mud in pipe jacking, thus solving the aforementioned problems.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: It includes a marking unit and a collection unit. The output end of the marking unit is connected to the input end of the collection unit. The marking unit is installed on the outlet pipe of the mud pump in the ground mud mixing plant and is used to uniformly mix conductive tracer particles into the injected mud. The output end of the marking unit is connected to the detection area of ​​the collection unit through a grouting pipe. During the injection process, the mud flows through the pipe section where the collection unit is located and enters the annular gap on the outer side of the pipe wall. The marking unit includes a shell. An injection pipe is provided at the top of the shell for adding conductive tracer particles. A sieve plate is slidably connected to the inner wall of the shell. A motor is fixedly connected to one side of the shell. The output shaft of the motor is fixedly connected to an output shaft through a coupling. A disc is fixedly connected to the bottom of the output shaft. An eccentric shaft is provided at the bottom of the disc. A limit frame is fixedly connected to one side of the sieve plate, and the inner wall of the limit frame is slidably connected to the eccentric shaft.

[0006] Preferably, two outer shells are fixedly connected to the outer wall of the housing, and an electric telescopic rod is fixedly connected to the inner wall of the two outer shells. An inverted V-plate is fixedly connected to the bottom telescopic end of the electric telescopic rod.

[0007] Preferably, the acquisition unit includes a pipe, and a plurality of array sensors are arranged within a 360-degree range on the inner wall of the pipe for emitting electromagnetic waves from inside the pipe to the outside, penetrating the pipe wall and the mud layer, and receiving the reflected signals.

[0008] Preferably, the output terminal of the acquisition unit is connected to a processing unit, which includes a preprocessing module, a reconstruction module, a feature extraction module, and an output module. The preprocessing module is used to denoise the signal transmitted from the acquisition unit.

[0009] Preferably, the reconstruction module uses an image reconstruction algorithm to invert the spatial distribution of mud volume fraction. The output of the preprocessing module is connected to the input of the reconstruction module, the output of the reconstruction module is connected to the input of the feature extraction module, and the output of the feature extraction module is connected to the input of the output module.

[0010] Preferably, the output of the processing unit is connected to an execution unit, which includes a receiving module, a driving module, a flow regulation module, and a status monitoring module. The input of the receiving module is connected to the output of the output module, the input of the driving module is connected to the output of the receiving module, the input of the flow regulation module is connected to the output of the driving module, and the input of the status monitoring module is connected to the output of the flow regulation module.

[0011] This invention also discloses a method for detecting the fluid distribution of lubricating mud in pipe jacking, specifically including the following steps: S1. By setting a marking unit at the outlet of the mud pump, a very small amount of conductive tracer particles are continuously mixed into the injected mud, so that the mud, air and soil exhibit different signal characteristics under electromagnetic waves, thus making them identifiable. S2. Then, the acquisition unit emits electromagnetic waves that penetrate the pipe wall and mud layer, receives the reflected signals, and simultaneously senses the pressure exerted by the mud on the outside of the pipe wall. S3. The processing unit processes the data collected by the acquisition unit to generate a color cross-sectional diagram of the mud distribution, and then the execution unit controls the grouting holes in the corresponding positions to perform fixed-point grouting.

[0012] Preferably, after the execution unit in step S3 completes its execution, it automatically jumps back to step S2 to repeat. If the target is met, the slurry replenishment is completed; if the target is not met, steps S2-S3 are repeated until the target is met.

[0013] The present invention has the following beneficial effects: 1. The pipe jacking lubrication mud fluid distribution detection system and method, by adding conductive tracer particles to the mud and cooperating with circumferential electromagnetic wave array scanning, can directly obtain the volume fraction distribution image of the mud in the annular gap on the outside of the pipe wall from the inside of the pipe, so that the actual distribution state of the mud after injection can be presented, and the construction personnel can intuitively see the distribution of mud in all directions.

[0014] 2. The pipe jacking lubrication mud fluid distribution detection system and method converts the detection data into specific values ​​of mud film thickness in each direction through the acquisition unit, so as to objectively reflect whether the lubrication effect meets the standard in a numerical way.

[0015] 3. The pipe jacking lubricating mud fluid distribution detection system and method locates the mud deficiency location through the execution unit, automatically calculates the amount of grout to be added, and drives the corresponding grouting holes to perform independent and precise grouting. After the grouting is completed, the grouting effect is automatically retested and verified, avoiding material waste and the risk of over-grouting, and effectively improving the quality and efficiency of pipe jacking construction.

[0016] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the processing unit structure of the present invention; Figure 3 This is a schematic diagram of the execution unit structure of the present invention; Figure 4 This is a schematic diagram of the mechanical structure of the marking unit of the present invention; Figure 5 This is a schematic diagram of the internal structure of the housing of the present invention; Figure 6 This is a schematic diagram of the pipeline structure of the present invention.

[0019] The attached diagram lists the components represented by each number as follows: 1. Marking unit; 2. Acquisition unit; 3. Processing unit; 4. Execution unit; 5. Preprocessing module; 6. Reconstruction module; 7. Feature extraction module; 8. Output module; 9. Receiving module; 10. Drive module; 11. Flow regulation module; 12. Status monitoring module; 201. Housing; 202. Injection pipe; 203. Sieve plate; 204. Motor; 205. Output shaft; 206. Disc; 207. Limiting frame; 208. Outer shell; 209. Electric telescopic rod; 210. Inverted V-plate; 211. Pipe; 212. Array sensor. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] This invention discloses a system and method for detecting the fluid distribution of lubricating mud in pipe jacking, and provides the following three technical solutions: Figures 1-6 The first embodiment is shown: a pipe jacking lubrication mud fluid distribution detection system, including a marking unit 1 and a collection unit 2. The output end of the marking unit 1 is connected to the input end of the collection unit 2, and is installed on the mud pump outlet pipeline of the ground mud mixing plant. It is used to uniformly mix conductive tracer particles into the injected mud. The output end of the marking unit 1 is connected to the detection area of ​​the collection unit 2 through a grouting pipeline. During the injection process, the mud flows through the pipe section where the collection unit 2 is located and enters the annular gap on the outer side of the pipe wall. The marking unit 1 includes a housing 201, the inner cavity of which serves as a temporary storage space for conductive tracer particles. An injection pipe 202 is provided at the top of the housing 201 for adding conductive tracer particles. It is vertically fixed to the top feed inlet of the housing 201. An openable sealing cover is provided at the top of the pipe. A gap is provided between the sealing cover and the injection pipe 202. Equipped with a rubber sealing ring, the sealing cover remains sealed when not feeding. A screen plate 203 is slidably connected to the inner wall of the housing 201. A motor 204 is fixedly connected to one side of the housing 201. The motor 204 is a variable frequency speed control motor, and its power cord is connected to an external power source through a waterproof cable connector. The output shaft of the motor 204 is fixedly connected to an output shaft 205 through a coupling. A disc 206 is fixedly connected to the bottom of the output shaft 205. An eccentric shaft is provided at the bottom of the disc 206. A limit frame 207 is fixedly connected to one side of the screen plate 203. The inner wall of the limit frame 207 is slidably connected to the eccentric shaft. The eccentric shaft extends into the limit groove of the limit frame 207. When the eccentric shaft moves in a circular motion with the disc 206, the eccentric shaft slides back and forth in the limit groove along the width direction of the limit groove, while simultaneously driving the limit frame 207 to move back and forth in a linear motion along the sliding direction of the screen plate 203.

[0022] Figures 1-6 The second embodiment is shown. The main difference from the first embodiment is that: two outer shells 208 are fixedly connected to the outer wall of the housing 201. The two outer shells 208 are symmetrically fixedly connected to the front and rear of the housing 201, respectively. An electric telescopic rod 209 is fixedly connected to the inner wall of the two outer shells 208. An inverted V plate 210 is fixedly connected to the bottom telescopic end of the electric telescopic rod 209.

[0023] The acquisition unit 2 includes a pipe 211, and several array sensors 212 are installed within a 360-degree range on the inner wall of the pipe 211. These sensors are used to emit electromagnetic waves from inside the pipe to the outside, penetrating the pipe wall and the mud layer, and to receive the reflected signals.

[0024] Figures 1-6 The third implementation is shown, and its main difference from the first two implementations is that the output of the acquisition unit 2 is connected to the processing unit 3. The processing unit 3 includes a preprocessing module 5, a reconstruction module 6, a feature extraction module 7, and an output module 8. The preprocessing module 5 is located in the industrial control computer in the ground control room. Its input is connected to the shielded cable of the acquisition unit 2 through a data acquisition card. The preprocessing module 5 has built-in wavelet threshold denoising algorithm and moving average filtering algorithm, which are used to denoise and filter the original electromagnetic wave signal and pressure signal transmitted from the acquisition unit 2. The output of the preprocessing module 5 is connected to the input of the reconstruction module 6 through the PCIe data bus inside the industrial control computer. The preprocessing module 5 is used to denoise the signal transmitted from the acquisition unit.

[0025] The reconstruction module 6 uses an image reconstruction algorithm to invert the spatial distribution of mud volume fraction. The output of the preprocessing module 5 is connected to the input of the reconstruction module 6, the output of the reconstruction module 6 is connected to the input of the feature extraction module 7, and the output of the feature extraction module 7 is connected to the input of the output module 8.

[0026] The output of processing unit 3 is connected to execution unit 4. Execution unit 4 includes receiving module 9, drive module 10, flow regulation module 11, and status monitoring module 12. Receiving module 9 is an industrial Ethernet communication module located in the PLC control cabinet in the ground control room. The input of receiving module 9 is connected to the output of output module 8 of processing unit 3 via Ethernet cable. Receiving module 9 has a built-in Modbus TCP / IP communication protocol stack, which is used to receive the slurry replenishment instruction data packets transmitted from output module 8 and to perform integrity verification and parsing of the data packets. The output of receiving module 9 is connected to the input of drive module 10 via PLC backplane bus. The input of receiving module 9 is connected to the output of output module 8. The input of drive module 10 is connected to the output of receiving module 9. The input of flow regulation module 11 is connected to the output of drive module 10. The input of status monitoring module 12 is connected to the output of flow regulation module 11.

[0027] This invention also discloses a method for detecting the fluid distribution of lubricating mud in pipe jacking, specifically including the following steps: First, the marking unit 1 mixes conductive tracer particles into the injected mud. The conductive tracer particles are added into the interior of the housing 201 through the injection pipe 202 at the top of the housing 201 and fall onto the screen plate 203. Then, the motor 204 starts, and its output shaft drives the output shaft 205 and the bottom disc 206 to rotate synchronously through the coupling. The eccentric shaft at the bottom of the disc 206 then performs a circular motion. The eccentric shaft slides within the limiting frame 207 and reciprocates to push the limiting frame 207, thereby causing the screen plate 203 to slide back and forth along the inner wall of the housing 201, screening the conductive tracer particles that fall onto the screen plate 203. This allows the particles to fall evenly into the mud pipe below the housing 201 and be injected into the outer wall of the jacking pipe along with the mud. The annular gap allows the mud to acquire conductive tags that can be recognized by electromagnetic waves. At this time, the acquisition unit 2 starts to work. Several array sensors 212 installed on the inner wall of the pipe 211 within a 360-degree range are distributed along the circumference of the pipe. Electromagnetic waves are emitted from the inside of the pipe outward. After penetrating the pipe wall and the mud layer on the outside of the pipe wall, the electromagnetic waves are reflected back through the soil interface and received by the array sensors 212. Because the mud contains conductive tracer particles, the response characteristics of the mud to electromagnetic waves are significantly different from those of air and soil. Based on this, the array sensors 212 collect the amplitude and phase signals of the electromagnetic waves containing information about the mud distribution. The acquisition unit 2 transmits the collected signals to the processing unit 3. The processing unit 3... The preprocessing module 5 first performs noise reduction on the received signal, removing vibrations and electromagnetic interference generated during pipe jacking construction to obtain clean signal data. The reconstruction module 6 receives the preprocessed signal and uses a built-in image reconstruction algorithm to retrieve the spatial distribution data of mud volume fraction in each direction around the outer wall of the pipe. Based on the output data of the reconstruction module, the feature extraction module 7 extracts the mud film thickness features in each direction and calculates the mud ring uniformity index. The output module 8 converts the feature extraction results into a color cross-sectional image of the mud distribution and generates a slurry replenishment command containing the location of mud loss and the amount of replenishment. The output module 8 transmits the slurry replenishment command to the execution unit 4, and the receiving module 9 of the execution unit 4 receives the command. The system receives and parses the grouting command to determine the location and amount of grouting required. The drive module 10 outputs drive power to the grouting hole control valve at the target location based on the parsing result of the receiving module, opening the corresponding valve. The flow regulation module 11 adjusts the grouting flow rate in real time during the grouting process to control the grouting speed. The status monitoring module 12 continuously monitors the pressure and cumulative flow during the grouting process. When the cumulative grouting amount reaches the target value or the pressure changes abnormally, it sends a grouting completion signal or an abnormal alarm signal to the processing unit 3. After receiving the feedback signal from the execution unit 4, the processing unit 3 re-measures the grouting area through the acquisition unit 2 to confirm whether the mud distribution status meets the standard, forming a complete closed loop.

[0028] Furthermore, all content not described in detail in this specification is existing technology known to those skilled in the art, and the model parameters of each electrical component are not specifically limited; conventional equipment can be used.

[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0030] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pipe jacking lubrication mud fluid distribution detection system, comprising a marking unit (1) and a data acquisition unit (2), characterized in that, The output end of the marking unit (1) is connected to the input end of the acquisition unit (2). The marking unit (1) is set on the mud pump outlet pipe of the ground mud mixing station and is used to uniformly mix conductive tracer particles into the injected mud. The output end of the marking unit (1) is connected to the detection area of ​​the acquisition unit (2) through the grouting pipe. During the injection process, the mud flows through the pipe section where the acquisition unit (2) is located and enters the annular gap on the outside of the pipe wall. The marking unit (1) includes a shell (201) and an injection pipe (202) is provided on the top of the shell (201). The shell (201) is used to add conductive tracer particles. A sieve plate (203) is slidably connected to the inner wall of the shell (201). A motor (204) is fixedly connected to one side of the shell (201). An output shaft (205) is fixedly connected to the output shaft (204) through a coupling. A disc (206) is fixedly connected to the bottom of the output shaft (205). An eccentric shaft is provided at the bottom of the disc (206). A limit frame (207) is fixedly connected to one side of the sieve plate (203). The inner wall of the limit frame (207) is slidably connected to the eccentric shaft.

2. The pipe jacking lubrication mud fluid distribution detection system according to claim 1, characterized in that, Two outer shells (208) are fixedly connected to the outer wall of the housing (201), and an electric telescopic rod (209) is fixedly connected to the inner wall of the two outer shells (208). An inverted V plate (210) is fixedly connected to the bottom telescopic end of the electric telescopic rod (209).

3. The pipe jacking lubrication mud fluid distribution detection system according to claim 2, characterized in that, The acquisition unit (2) includes a pipe (211), and a number of array sensors (212) are provided within a 360-degree range on the inner wall of the pipe (211) for transmitting electromagnetic waves from inside the pipe to outside, penetrating the pipe wall and mud layer, and receiving the reflected signals.

4. The pipe jacking lubrication mud fluid distribution detection system according to claim 3, characterized in that, The acquisition unit (2) is connected to a processing unit (3) at its output end. The processing unit (3) includes a preprocessing module (5), a reconstruction module (6), a feature extraction module (7), and an output module (8). The preprocessing module (5) is used to denoise the signal transmitted from the acquisition unit.

5. The pipe jacking lubrication mud fluid distribution detection system according to claim 4, characterized in that, The reconstruction module (6) uses an image reconstruction algorithm to invert the spatial distribution of mud volume fraction. The output of the preprocessing module (5) is connected to the input of the reconstruction module (6). The output of the reconstruction module (6) is connected to the input of the feature extraction module (7). The output of the feature extraction module (7) is connected to the input of the output module (8).

6. The pipe jacking lubrication mud fluid distribution detection system according to claim 5, characterized in that, The output of the processing unit (3) is connected to the execution unit (4). The execution unit (4) includes a receiving module (9), a driving module (10), a flow regulation module (11), and a status monitoring module (12). The input of the receiving module (9) is connected to the output of the output module (8). The input of the driving module (10) is connected to the output of the receiving module (9). The input of the flow regulation module (11) is connected to the output of the driving module (10). The input of the status monitoring module (12) is connected to the output of the flow regulation module (11).

7. A method for detecting the distribution of lubricating mud fluid in pipe jacking, implemented using the pipe jacking lubricating mud fluid distribution detection system according to any one of claims 1-6, characterized in that, Specifically, the following steps are included: S1. By setting a marking unit (1) at the outlet of the mud pump, a very small amount of conductive tracer particles are continuously mixed into the injected mud, so that the mud, air and soil exhibit different signal characteristics under electromagnetic waves, and thus can be identified. S2. Then, the electromagnetic waves emitted by the acquisition unit (2) penetrate the pipe wall and mud layer, receive the reflected signals, and at the same time sense the pressure applied by the mud on the outside of the pipe wall. S3. The processing unit (3) processes the data collected by the acquisition unit (2) to generate a color cross-sectional diagram of the mud distribution, and then the execution unit (4) controls the grouting holes in the corresponding directions to perform fixed-point grouting.

8. A method for detecting the fluid distribution of pipe jacking lubrication mud according to claim 7, characterized in that, After the execution unit (4) in step S3 is completed, it automatically jumps back to step S2 to repeat. If the standard is met, the grouting is completed. If the standard is not met, step S2-step S3 is repeated until the standard is met.

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