A flexible lining repair construction method for a large curvature sewer

Abstract

The application discloses a flexible inner lining repair construction method for a large-curvature drainage pipeline, and comprises the following steps: defect positioning of the drainage pipeline is carried out through a visual pipeline detection tool, and pipeline laying trend conditions are obtained through analysis; the drainage pipeline at a large-curvature curve section is modeled, and parameters of the large-curvature curve section of the drainage pipeline are determined; according to the modeling data of the drainage pipeline and the parameters of the large-curvature curve section, the position of a principal point of the large-curvature curve section of the drainage pipeline and the coordinates of the position of the principal point are determined; according to the parameters of the large-curvature curve section of the drainage pipeline, a corresponding flexible inner lining is processed and formed, and the flexible inner lining is arranged at the position of the principal point; a jacking equipment is arranged at the position of the principal point to change the bending angle of the flexible inner lining, so that the large-curvature curve section of the drainage pipeline is repaired. The flexible inner lining is closely attached to the curve section of the repaired pipeline, the service life of the inner lining is prolonged, and the quality and safety of pipeline repair construction are important.

Description

Technical Field

[0001] This invention belongs to the field of municipal pipeline damage repair construction, specifically involving a flexible lining repair construction method for drainage pipelines with large curvature. Background Technology

[0002] With the development of science and technology and people's increasing demands for a better living environment, horizontal directional drilling technology has been widely used in municipal engineering projects such as water supply, gas, electricity, and communications to avoid damage to the urban environment and traffic congestion during pipeline construction. A key technical characteristic of this process is the presence of vertical curves in the resulting pipelines. Although the minimum allowable bending radius for steel pipes is 1500 times the outer diameter, and polyethylene pipes have different standards depending on the pipe diameter, in actual construction, the technical capabilities of the construction unit and workers can sometimes lead to uncontrolled arc shapes in the final pipeline, potentially resulting in irregular or highly curved pipelines.

[0003] Meanwhile, during road construction, in order to adapt well to the terrain, avoid obstacles, and create a constantly changing driving experience, keeping drivers alert and increasing driving safety, circular curves and transition curves may be included in the road design. Although regulations require that the minimum radius of horizontal curves meet the road design turning speed requirements to ensure the safety and comfort of vehicles, urban planning influences during municipal road construction may still result in some continuous or excessively curved horizontal curve sections. Consequently, horizontal curve sections will also be created during the construction of underground municipal drainage pipelines. Therefore, it is evident that municipal pipelines in actual engineering projects exist in both vertical and horizontal curve forms, and as underground engineering projects, their curved sections are often difficult to control due to limitations in construction technology.

[0004] The flexible lining in-situ curing technology uses a composite fiber-reinforced flexible tube with impermeability and corrosion resistance as a carrier. This tube is impregnated with epoxy resin or unsaturated resin and then used as the lining material. The resin-impregnated fiberglass tube is pulled into the pre-treated drainage pipe through a manhole. Air pressure is used to expand the tube, pressing it tightly against the old pipe. Ultraviolet light is then used to cure the tube, forming a fiberglass-like composite lining layer on the inner wall of the original pipe. Although the lining material is flexible and can fit most curved pipes with small curvatures, in cases involving irregular or large curved pipes, poor fit and wrinkles may still occur. These common quality defects not only affect the water flow rate after repair but also cause stress concentration in the cured pipe lining at those locations, shortening the service life of the repaired lining. Summary of the Invention

[0005] The purpose of this invention is to provide a flexible lining repair construction method for drainage pipes with large curvature, which allows the flexible lining to fit tightly into the curved section of the pipe being repaired, thereby extending the service life of the lining and playing an important role in ensuring the quality and safety of pipe repair construction.

[0006] To solve the above-mentioned technical problems, the technical solution of the present invention is: a construction method for repairing flexible linings of drainage pipes with large curvature, comprising the following steps:

[0007] Visual pipeline inspection tools are used to locate defects in drainage pipelines and analyze the pipeline laying direction.

[0008] Model the drainage pipe at the large curvature curve segment and determine the parameters of the drainage pipe at the large curvature curve segment; the parameters should include at least the curve radius, curve length, and transition section length;

[0009] Based on the modeling data of the drainage pipeline and the parameters at the large curvature curve segment, determine the location of the principal point and the coordinates of the principal point at the large curvature curve segment of the drainage pipeline;

[0010] Based on the parameters of the large curvature section of the drainage pipe, a corresponding flexible liner is formed and placed at the main point position.

[0011] A jacking device is installed at the main point to change the bending angle of the flexible liner, thereby repairing the large curvature section of the drainage pipe.

[0012] When locating defects in drainage pipes using visual pipe inspection tools, the smaller the curve radius, the greater the curvature, and the more curved the pipe. If the curve radius is less than or equal to 500m, it is determined that a defect has occurred.

[0013] The drainage pipes at the high curvature curve section were modeled using BIM software.

[0014] The method for setting up a flexible liner is as follows: a top support device is installed inside the flexible liner, and a traction device is installed on the ground above the end point of one end of the large curvature curve section of the drainage pipe. The flexible liner is pulled from the ground above the other end point of the large curvature curve section of the drainage pipe by the steel wire rope tied to the traction device until the top support device reaches the main point position.

[0015] The traction speed of the flexible liner is less than 6 m / min.

[0016] The selection of flexible liners includes, but is not limited to, resin-impregnated hoses.

[0017] The selection of support equipment includes, but is not limited to, airbags.

[0018] The airbag is set up as follows: after the airbag reaches the main position, it is inflated. First, the inflation rate is increased evenly at 1 kPa / min. When the pressure inside the airbag reaches 10 kPa, the inflation rate is adjusted to 5 kPa / min. Then, the pressure inside the airbag is maintained at 25 kPa for ≥10 minutes.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] 1. For underground pipelines such as municipal pipelines, trenchless pipeline repair technology can repair underground drainage pipes without excavating the ground, minimizing the impact on traffic and the environment. It can also make the load distribution on buried pipelines more uniform, thereby reducing pipeline deformation.

[0021] 2. In the face of existing pipelines that may have curved sections that need repair, this technology solves the common quality problems that may occur when using the in-situ curing technology of flexible lining to repair pipe sections, such as poor fit and wrinkles.

[0022] 3. After the pipeline dredging is completed, a CCTV robot is used to visually inspect the pipeline, which can promptly detect whether there are curved sections in the underground pipeline and collect data on those curved sections.

[0023] 4. Using BIM software, the curved pipe section is modeled based on the collected data, and its curved features are formed. This allows for early observation of the pipe's shape and characteristics, facilitates the production of flexible linings by the manufacturer, and simplifies subsequent repair operations.

[0024] 5. Secure the airbag to the flexible liner and pull it into the main position inside the curved pipe. After the airbag is inflated, the flexible liner will fit tightly against the damaged area on the inner wall of the curved pipe, preventing air pockets or wrinkles. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the operation process of an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of a high-curvature drainage pipe in an embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram showing the placement of the flexible liner and airbag in an embodiment of the present invention;

[0028] Figure 4 This is an example diagram of an "S"-shaped horizontal curve pipe in an embodiment of the present invention;

[0029] Figure 5 This is a schematic diagram illustrating the arrangement of the flexible liner in an embodiment of the present invention;

[0030] Figure 6 This is a schematic diagram of the airbag in its inflated state in an embodiment of the present invention;

[0031] Figure 7 This diagram illustrates the problems that easily arise in the flexible lining of snakes in the prior art of this invention. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be 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 and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0033] The technical solution of this invention is: a construction method for repairing flexible linings of drainage pipes with large curvature, comprising the following steps:

[0034] Visual pipeline inspection tools are used to locate defects in drainage pipelines and analyze the pipeline laying direction.

[0035] Model the drainage pipe at the large curvature curve segment and determine the parameters of the drainage pipe at the large curvature curve segment; the parameters should include at least the curve radius, curve length, and transition section length;

[0036] Based on the modeling data of the drainage pipeline and the parameters at the large curvature curve segment, determine the location of the principal point and the coordinates of the principal point at the large curvature curve segment of the drainage pipeline;

[0037] Based on the parameters of the large curvature section of the drainage pipe, a corresponding flexible liner is formed and placed at the main point position.

[0038] A jacking device is installed at the main point to change the bending angle of the flexible liner, thereby repairing the large curvature section of the drainage pipe.

[0039] like Figure 2 As shown, when locating defects in drainage pipes using a visual pipe inspection tool, a smaller curve radius indicates a greater curvature and a more tortuous pipe. A curve radius less than or equal to 500 mm is considered a defect. Figure 2 and Figure 4 The unit of the radius R of the curve is meters (m).

[0040] The drainage pipes at the high curvature curve section were modeled using BIM software.

[0041] The method for setting a flexible liner is as follows: (e.g., ...) Figure 5As shown, a top-support device is installed inside the flexible liner. A traction device is installed on the ground above one end of the large curvature section of the drainage pipe. The flexible liner is pulled from the ground above the other end of the large curvature section of the drainage pipe by a steel wire rope tied to the traction device until the top-support device reaches the main point position. Figure 3 As shown.

[0042] The traction speed of the flexible liner is less than 6 m / min.

[0043] The selection of flexible liners includes, but is not limited to, resin-impregnated hoses.

[0044] The selection of support equipment includes, but is not limited to, airbags.

[0045] like Figure 6 As shown, the airbag is set up as follows: after the airbag reaches the main position, it is inflated. First, the inflation rate is increased evenly at 1 kPa / min. When the pressure inside the airbag reaches 10 kPa, the inflation rate is adjusted to 5 kPa / min until the pressure inside the airbag reaches 25 kPa. Then, this pressure value is maintained for ≥10 min.

[0046] Specific implementation plan and operational procedures:

[0047] like Figure 1 As shown,

[0048] 1. Dredging and sealing of old municipal pipelines, removing accumulated sludge from the pipes to be repaired. This lays a solid foundation for subsequent defect location and pipeline repair work.

[0049] 2. Use visual pipeline inspection tools to collect data on pipeline routing while locating defects. If vertical or horizontal curves are found, report them immediately and collect data. Record parameters such as coordinates and points of intersection, and create drawings. Instruct the personnel before proceeding with repairs.

[0050] 3. Use BIM software to model the drainage pipes with confirmed large curvature curves, and determine the detailed parameters of the curves and the layout of the pipe processing dimensions.

[0051] 4. Compile the data for this curve segment, contact the flexible lining manufacturer, and customize the flexible lining for this construction section according to the curve parameters. For example... Figure 4 As shown, the example "S"-shaped horizontal curve pipe has two circular curve segments.

[0052] 5. Determine the principal points of the pipeline curve based on the pipeline modeling data, and then proceed with the lining installation. After CCTV inspection, bring back a rope to pull in the protective membrane. The protective membrane's function is to protect the outer membrane from being torn during the material installation process.

[0053] After pulling in the protective membrane, simultaneously pull back a rope. Alternatively, use a steel wire rope to pull the inner lining. Ensure both ends are properly aligned, and pull the steel wire rope forward with some force. The pulling ends should be symmetrical; otherwise, the steel wire rope may slip under the protective membrane.

[0054] Secure the protective membrane inside the inspection well with expansion bolts to prevent it from being pulled into the pipe along with the inner lining. After threading the steel wire rope, position the tractor and pull in the inner lining, controlling the lining insertion and release speed to be less than 6 m / min.

[0055] 6. After the liner is installed, place airbags at the main points of the curve according to the distance. These airbags will inflate during the pneumatic expansion operation, allowing the customized liner to fit the curved section of the pipeline. After the airbags are in place and the liner ropes are connected, secure the knots. If there are inspection wells in the construction section, wrap them with white cloth before starting the inflation process. The white cloth should extend at least 20cm into the pipe at both ends.

[0056] 7. When inflating, strictly follow the inflation procedure. Inflate evenly at a rate of 1 kPa / min until a pressure of 10 kPa is reached. Then adjust the inflation rate to 5 kPa / min and increase the pressure evenly to 25 kPa, maintaining this pressure for at least 10 minutes. Do not inflate to the full pressure in one go, otherwise it will lead to... Figure 7 The hose shown is not expanding evenly and has wrinkles.

[0057] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for repairing the flexible lining of a drainage pipe with large curvature, characterized in that, Includes the following steps: Visual pipeline inspection tools are used to locate defects in drainage pipelines and analyze the pipeline laying direction. Modeling of the drainage pipe at the large curvature curve segment involves using BIM software to model the drainage pipe at the large curvature curve segment and determine the parameters of the drainage pipe at the large curvature curve segment; the parameters include at least the curve radius, curve length, and transition section length; Based on the modeling data of the drainage pipeline and the parameters at the large curvature curve segment, determine the location of the principal point and the coordinates of the principal point at the large curvature curve segment of the drainage pipeline; The flexible liner is formed according to the parameters of the large curvature curve section of the drainage pipe, and the flexible liner is set at the main point position. The method of setting the flexible liner is as follows: a top support device is set inside the flexible liner, and a traction device is set on the ground above the end point of one end of the large curvature curve section of the drainage pipe. The flexible liner is pulled from the ground above the other end point of the large curvature curve section of the drainage pipe by the steel wire rope tied to the traction device until the top support device reaches the main point position. A jacking device is installed at the main point to change the bending angle of the flexible liner, thereby repairing the large curvature section of the drainage pipe.

2. The method for repairing a flexible lining of a large-curvature drainage pipe according to claim 1, characterized in that, When locating defects in drainage pipes using a visual pipe inspection tool, a defect is identified if the curve radius is less than or equal to 500m.

3. The method for repairing a flexible lining of a large-curvature drainage pipe according to claim 1, characterized in that, The traction speed of the flexible liner is less than 6 m / min.

4. The method for repairing a flexible lining of a large-curvature drainage pipe according to claim 1, characterized in that, The flexible inner liner is selected as the resin-impregnated hose.

5. The method for repairing a flexible lining of a large-curvature drainage pipe according to claim 1, characterized in that, The support device chosen is an airbag.

6. The method for repairing a flexible lining of a large-curvature drainage pipe according to claim 5, characterized in that, The airbag is set up as follows: after the airbag reaches the main position, it is inflated. First, the inflation rate is increased evenly at 1 kPa / min. When the pressure inside the airbag reaches 10 kPa, the inflation rate is adjusted to 5 kPa / min. Then, the pressure inside the airbag is maintained at 25 kPa for ≥10 minutes.

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