Non-excavation treatment method for leakage of sewage pipe network based on grouting technology

Abstract

The invention provides a non-excavation treatment method for leakage of a sewage pipe network based on grouting leakage stoppage. The non-excavation treatment method comprises the following steps: constructing a pipe network leakage treatment model; pipeline defect information and pipe periphery soil cavity information are obtained and recognized in a multi-sensor fusion mode; generating a pipe network leakage actual model based on three-dimensional point cloud modeling according to the obtained pipeline defect information and the pipe periphery soil cavity information; performing defect grade analysis and evaluation on the actual pipe network leakage model through the pipe network leakage treatment model, and designing a drilling scheme according to an analysis and evaluation result; in the grouting process, the grouting speed is dynamically adjusted according to the grouting pressure, the grouting amount information and the grout diffusion radius information which are obtained in real time. Multi-source sensing data are fused, closed-loop control of detection, scheme design, grouting and evaluation is achieved, grout is non-toxic and resistant to corrosion, the bonding strength with a pipeline and a soil body after solidification is high, pipeline leakage is synchronously blocked, the soil body around the pipeline is reinforced, and the method has the advantages of being rapid in construction, low in cost and environmentally friendly.

Description

Technical Field

[0001] The present invention relates to the field of pipeline network leakage treatment, and particularly to a trenchless treatment method for sewage pipeline network leakage based on grouting plugging. Background Art

[0002] At present, most of the urban drainage pipeline networks in China have been in use for more than ten years. Due to the effects of sewage corrosion, erosion, scouring, sedimentation, and ground load, the problem of serious damage to sewage pipelines is widespread in Chinese cities.

[0003] For the repair of sewage pipeline network leakage, the traditional method is to carry out excavation treatment, that is, it is necessary to dig the road surface to expose the pipeline and then carry out repair treatment. This method not only has a long construction period and high cost, but also has a great impact on traffic and the environment. The current mainstream trenchless technology is mainly the CIPP lining method. A non-woven lining pipe or fiberglass is pre-treated and then dragged into the pipeline. After the lining is completely installed in the main pipeline, it is heated with water, or steam, or ultraviolet UV to cause the resin to undergo a chemical reaction and cure. After the lining is cured, a new continuous pipeline with full structural strength will be formed in the original pipeline. However, the CIPP lining method has poor adaptability to pipeline deformation and cannot repair the voids in the surrounding soil of the pipe. The existing grouting technology is mostly used for soil reinforcement, and there is a lack of precise control means for the dynamic leakage treatment of sewage pipeline networks. The slurry is easy to flow away and the curing effect is poor. Summary of the Invention

[0004] In order to solve the problems existing in the background art, the present invention proposes a trenchless treatment method for sewage pipeline network leakage based on grouting plugging.

[0005] A trenchless treatment method for sewage pipeline network leakage based on grouting plugging includes the steps of: S100. Construct a pipeline network leakage treatment model; S200. Obtain and identify pipeline defect information and surrounding soil void information of the pipe through a multi-sensor fusion method; S300. Based on the obtained pipeline defect information and surrounding soil void information of the pipe, generate an actual model of pipeline network leakage based on three-dimensional point cloud modeling; S400. Analyze and evaluate the defect level of the actual model of pipeline network leakage through the pipeline network leakage treatment model, and design a drilling scheme according to the analysis and evaluation results; S500. Dynamically adjust the grouting speed according to the grouting pressure, grouting volume information, and slurry diffusion radius information obtained in real time during the grouting process.

[0006] Based on the above, it includes step S600. Detect and obtain the plugging information of the reinforced area after grouting, and evaluate the repair effect through the pipeline network leakage treatment model.

[0007] Based on the above, in step S200, pipeline defect information and soil cavity information around the pipe are obtained through a CCTV pipeline inspection robot, a sonar imaging sensor, and / or a fiber Bragg grating sensor.

[0008] Based on the above, according to the obtained pipeline defect information and soil cavity information around the pipe, combined with the GIS geographic information system, a practical model of pipeline network leakage is generated based on three-dimensional point cloud modeling, including a pipeline defect model, a soil cavity model around the pipe, and a land model corresponding to the pipeline defect.

[0009] Based on the above, a defect level evaluation method and a corresponding drilling strategy are preset in the pipeline network leakage treatment model. The pipeline network leakage treatment model is used to grade the defects of the practical model of pipeline network leakage and automatically design a drilling plan. After manual review and revision, the drilling plan is determined.

[0010] Based on the above, the grouting slurry includes liquid A and liquid B. The components of liquid A include 40%-60% by volume of modified epoxy resin, 5%-10% of nano-silica, 3%-5% of a water repellent, and 2% of a plasticizer; the components of liquid B include 30%-50% by volume of a polyurethane curing agent, 5%-8% of a thixotropic regulator, and 10%-15% of a silicate activator; the volume ratio of liquid A to liquid B is 2:1 - 4:1.

[0011] Based on the above, a preset threshold for grouting pressure fluctuation, a threshold for grouting volume, and a threshold for slurry diffusion radius are set. When the grouting pressure fluctuation exceeds the preset threshold, the grouting volume per unit time drops to the preset threshold, or the slurry diffusion radius reaches the preset threshold, the grouting is stopped and an alarm is given.

[0012] Based on the above, after grouting, the density information of the reinforced area is obtained through geological radar scanning, and the plugging effect of the leakage point is verified and evaluated through a pipeline endoscope.

[0013] The present invention has outstanding substantive features and remarkable progress compared with the prior art. Specifically, the present invention realizes closed-loop control of detection - scheme design - grouting - evaluation by integrating multi-source sensing data. The slurry is non-toxic, corrosion-resistant, has a high bonding strength with the pipeline and the soil after curing, synchronously plugs pipeline leakage and reinforces the soil around the pipe, and has the advantages of fast construction, low cost, and environmental friendliness. Brief Description of the Drawings

[0014] Figure 1 is a flowchart of the present invention. Detailed Embodiments

[0015] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0016] As Figure 1 shown, a trenchless treatment method for sewage pipe network leakage based on grouting plugging includes the steps of: S100, constructing a pipe network leakage treatment model; S200, obtaining and identifying pipeline defect information and soil cavity information around the pipe through multi-sensor fusion; S300, generating an actual pipe network leakage model based on three-dimensional point cloud modeling according to the obtained pipeline defect information and soil cavity information around the pipe; S400, analyzing and evaluating the defect level of the actual pipe network leakage model through the pipe network leakage treatment model, and designing a drilling plan according to the analysis and evaluation results; S500, dynamically adjusting the grouting speed according to the grouting pressure, grouting volume information and slurry diffusion radius information obtained in real time during the grouting process.

[0017] During use, pipeline defect information and soil cavity information around the pipe are obtained through a CCTV pipeline inspection robot, a sonar imaging sensor or / and a fiber Bragg grating sensor, etc., so as to locate the defect position, distribution, etc., and locate and master the position, size, etc. of the soil cavity information around the pipe. Through the fusion of detection data of multiple sensors, combined with the GIS geographic information system based on three-dimensional point cloud modeling, an actual pipe network leakage model is generated in the constructed pipe network leakage treatment model. The actual pipe network leakage model includes a pipeline defect model, a soil cavity model around the pipe and a land model corresponding to the pipeline defect. The pipeline defect model is used to construct the size, shape, position, distribution, etc. of the pipeline defect. The soil cavity model around the pipe is used to construct the size, relative position, distribution, etc. of the soil cavity caused by leakage or settlement of the soil around the pipe. The land model is used to construct information such as the soil type corresponding to the defect collected on the artificial ground, the depth from the defect, and the ground obstacles.

[0018] In the pipeline network leakage treatment model, a defect level evaluation method and the corresponding drilling strategy are preset respectively. The pipeline network leakage treatment model is used to evaluate the defects of the actual pipeline network leakage model and automatically design the drilling plan. After manual review and revision, the drilling plan is determined. In this embodiment, the first-level defect and the second-level defect are taken as examples for illustration. The crack width of the first-level defect is >5 mm, and the corresponding drilling strategy preferably adopts concentric circular hole layout, with a hole diameter of 60 mm and a hole spacing of 0.8 m. The crack width of the second-level defect is ≤5 mm, and the corresponding drilling strategy preferably adopts cross-grid hole layout, with a hole diameter of 40 mm and a hole spacing of 1.2 m. According to the information analysis of the land model, the corresponding drilling depth and angle are calculated, such as an inclination angle of 15°-30° to avoid damaging the pipe wall. After model analysis, the analysis results and the designed drilling plan are obtained. After manual review or adjustment, drilling is carried out to penetrate the loose soil around the pipe to the stable layer.

[0019] During grouting, in this embodiment, the grouting slurry includes liquid A and liquid B. The components of liquid A include 40%-60% by volume of modified epoxy resin, 5%-10% of nano-silica, 3%-5% of water repellent, and 2% of plasticizer. The components of liquid B include 30%-50% by volume of polyurethane curing agent, 5%-8% of thixotropic regulator, and 10%-15% of silicate activator. In this embodiment, the use of nano-materials enhances the anti-seepage property of the slurry, and the permeability coefficient is ≤1×10⁻ 8cm / s, the hydrophobic agent improves the anti-erosion performance. During use, liquid A and liquid B are mixed in a volume ratio of 2:1 - 4:1. After mixing, the initial setting time is 5 - 20 minutes, and the compressive strength after curing is ≥18 MPa. During the grouting process, a high-pressure grouting pump (pressure range 0.5 - 5.0 MPa) and a multi-channel grouting pipe are used, and the grouting parameters are monitored in real time, including grouting pressure (through a pressure sensor), flow rate (through a flow meter), slurry diffusion radius (through resistivity CT imaging), etc. In this embodiment, preset grouting pressure fluctuation threshold, grouting volume threshold, and slurry diffusion radius threshold are set. When the grouting pressure fluctuation exceeds the preset threshold, the grouting volume per unit time drops to the preset threshold, or the slurry diffusion radius reaches the preset threshold, the grouting stops and an alarm is given. The grouting parameters are dynamically adjusted based on the fuzzy PID algorithm, and the grouting stops when the following conditions are met: the pressure fluctuation ≤ ±0.2 MPa, the diffusion radius reaches the design value R = 1.5 × the diameter of the cavity, or the grouting volume per unit time drops to 10% of the initial value. When the threshold is exceeded, an alarm is given, and manual inspection and adjustment of the plan are carried out. Taking the repair of a DN1200 concrete sewage pipe in a certain city as an example, 2 circumferential cracks (length 3 m, width 8 mm) and soil cavities around the pipe (volume 2.5 m³) are found through defect detection; according to the layout design for first-level defects, 18 grouting holes are arranged in two inner and outer circles (inner circle hole diameter 60 mm, outer circle hole diameter 50 mm); the grouting parameter A / B liquid volume ratio is 3:1, the initial grouting pressure is 1.8 MPa, and the peak pressure is 3.5 MPa; the total grouting volume is 2.2 m³, and the grouting time is 45 minutes. After the repair effect is evaluated, the slurry filling rate is 98%, the soil bearing capacity is increased from 80 kPa to 220 kPa; the pipeline leakage volume is reduced from 12 L / min before repair to 0.05 L / min. In this embodiment, the construction efficiency is increased by 50%, and the comprehensive cost is reduced by 30%; the service life of the repaired pipe network can be extended by 10 - 15 years; after optimizing the grouting parameters, the slurry utilization rate ≥90% is achieved, reducing material waste. The slurry is non-toxic and harmless, and there is no leaching substance after curing, reducing environmental pollution.

[0020] Preferably, the trenchless treatment method for sewage pipe network leakage based on grouting plugging further includes step S600, detecting and obtaining the plugging information of the reinforced area after grouting, and evaluating the repair effect through the pipe network leakage treatment model. Specifically, after grouting, the density information of the reinforced area is obtained by geological radar scanning, and the relative dielectric constant ≤8 is required, and the plugging effect of the leakage point is verified and evaluated through a pipeline endoscope, and the leakage volume ≤0.1 L / min is required.

[0021] It is obvious to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, in any respect, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Accordingly, all changes that fall within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

Claims

1. A trenchless treatment method for sewage pipe network leakage based on grouting plugging, characterized in that: Includes steps: S100, build a pipe network leakage control model; S200, acquiring and identifying pipeline defect information and soil cavity information around the pipeline by multi-sensor fusion; S300, generating an actual model of pipeline network leakage based on three-dimensional point cloud modeling according to the acquired pipeline defect information and soil cavity information around the pipeline; S400, analyzing and evaluating the defect level of the actual pipeline network leakage model through the pipeline network leakage control model, and designing a drilling plan based on the analysis and evaluation results; S500, during the grouting process, dynamically adjust the grouting speed according to the grouting pressure, grouting volume information and slurry diffusion radius information obtained in real time.

2. The trenchless treatment method for sewage pipe network leakage based on grouting plugging according to claim 1 is characterized by: The method comprises step S600, detecting and obtaining the plugging information of the reinforced area after grouting, and evaluating the repair effect through the pipeline network leakage control model.

3. The trenchless treatment method for sewage pipe network leakage based on grouting plugging according to claim 1 is characterized by: In step S200, pipeline defect information and soil cavity information around the pipeline are obtained by using a CCTV pipeline inspection robot, a sonar imaging sensor and / or a fiber grating sensor.

4. The trenchless treatment method for sewage pipe network leakage based on grouting plugging according to claim 1 is characterized by: According to the acquired pipeline defect information and the void information of soil around the pipe, the actual model of pipeline network leakage is generated based on 3D point cloud modeling in combination with GIS geographic information system, including pipeline defect model, void model around the pipe and land model corresponding to the pipeline defect.

5. The trenchless treatment method for sewage pipe network leakage based on grouting plugging according to claim 1 is characterized by: The defect grade assessment method and the corresponding drilling strategy are preset in the pipeline leakage control model. The actual pipeline leakage model is rated for defects and the drilling plan is automatically designed through the pipeline leakage control model. The drilling plan is determined after manual review and revision.

6. The trenchless treatment method for sewage pipe network leakage based on grouting plugging according to claim 1 is characterized by: The grouting slurry includes liquid A and liquid B. Liquid A includes 40%-60% by volume of modified epoxy resin, 5%-10% of nano-silicon dioxide, 3%-5% of hydrophobic agent and 2% of plasticizer; liquid B includes 30%-50% by volume of polyurethane curing agent, 5%-8% of thixotropic regulator and 10%-15% of silicate activator; the volume ratio of liquid A to liquid B is 2:1-4:

1.

7. The trenchless treatment method for sewage pipe network leakage based on grouting plugging according to claim 1 is characterized by: The grouting pressure fluctuation threshold, grouting volume threshold and slurry diffusion radius threshold are preset. When the grouting pressure fluctuation exceeds the preset threshold, the grouting volume per unit time drops to the preset threshold, or the slurry diffusion radius reaches the preset threshold, the grouting is stopped and an alarm is issued.

8. The trenchless treatment method for sewage pipe network leakage based on grouting plugging according to claim 2 is characterized by: After grouting, the density information of the reinforced area is obtained through geological radar scanning, and the sealing effect of the leakage point is verified and evaluated through the pipeline endoscope.

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