In-situ repair construction process for trenchless large-diameter composite pipe

Abstract

The application discloses a kind of trenchless large-diameter composite pipe in-situ repair construction technology, specifically related to municipal pipe network trenchless repair engineering technical field, comprising the following steps: step S1: target large-diameter composite pipe is detected in whole, and the position of pipeline cracking, misplacement, corrosion, settlement disease is marked, and according to deformation amount, slight deformation section, moderate deformation section and severe deformation section are divided;Step S2: water-blocking air bag is respectively installed in the inspection well at the both ends of the pipe section to be repaired, temporary diversion pipeline is built, and water flow in the pipe is completely cut off;Step S3: double-layer glass fiber geotextile is used as reinforcing matrix, and double-layer glass fiber cloth is completely immersed in mortar to make inner lining blanket.The application effectively solves the problems of large-diameter pipe lining sagging, hollowing cracking and pipe mouth water seepage, and the repaired pipe has high structural strength and good anti-seepage effect.The whole construction is trenchless, with small construction interference and lower cost, which can meet the long-term structural repair use requirements of large-diameter composite pipe.

Description

Technical Field

[0001] This invention relates to the field of trenchless repair engineering technology for municipal pipelines, and more specifically, to a trenchless in-situ repair construction process for large-diameter composite pipes. Background Technology

[0002] Large-diameter composite water supply and drainage pipelines in urban built-up areas generally have a service life exceeding 15 years. Long-term exposure to groundwater corrosion, vehicle loads, and uneven soil settlement makes them highly susceptible to structural defects such as pipe wall cracking, misalignment, large-area leakage, and localized deformation and collapse. Traditional open-cut repair requires extensive road surface demolition and relocation of densely packed surrounding pipelines, resulting in long construction periods, traffic disruptions, severe dust and noise pollution, and extremely high overall construction costs. Therefore, trenchless in-situ repair has become the mainstream technical approach.

[0003] In existing technologies, conventional UV-cured flexible tube linings have relatively small wall thicknesses and insufficient overall structural rigidity, failing to meet the structural reinforcement requirements of large-diameter pipelines under high soil loads. Ordinary mortar spraying repairs can only achieve surface corrosion protection, resulting in poor overall lining integrity and a high risk of cracking and detachment, thus failing to repair structural defects in the pipeline. Furthermore, large-diameter pipelines have large internal spaces, making it prone to problems such as lining sagging, loose pipe wall adhesion, and interface delamination after lining installation. In addition, inadequate sealing of pipe openings allows groundwater to easily seep in through gaps, leading to overall lining peeling and failure.

[0004] To address the aforementioned problems, a technical solution is provided. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the embodiments of the present invention provide a trenchless large-diameter composite pipe in-situ repair construction process to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A trenchless in-situ repair process for large-diameter composite pipes includes the following steps:

[0008] Step S1: Perform endoscopic inspection of the entire target large-diameter composite pipe, mark the locations of pipe cracks, misalignments, corrosion, and settlement defects, and divide the pipe into slightly deformed, moderately deformed, and severely deformed sections based on the amount of deformation.

[0009] Step S2: Install water-stopping airbags at both ends of the inspection wells of the pipe section to be repaired, and build a temporary diversion pipeline to completely cut off the water flow in the pipe;

[0010] Step S3: Use double-layer fiberglass geotextile as the reinforcing matrix, completely impregnate the double-layer fiberglass geotextile with mortar to make an inner lining blanket, send the inner lining blanket into the pipe, and use air pressure to evenly expand the inner lining blanket so that the inner lining blanket fits the inner wall of the pipe.

[0011] Step S4: Maintain constant air pressure inside the pipeline for pressure stabilization and shaping, and allow the inner mortar to initially set and form under sealed conditions at room temperature.

[0012] Step S5: After depressurizing the water-sealing airbag, cut off the excess inner lining material at both ends of the pipe, seal the pipe ends with waterproof mortar, and allow it to cure naturally in a sealed manner.

[0013] In a preferred embodiment, in step S1, a CCTV robot is used for continuous scanning imaging to record the depth of the lesion and the length of the circumferential crack, and to determine the lining thickness parameters for different regions.

[0014] It should be noted that pipeline defects should be classified and treated in advance, and the lining thickness should be matched to different areas to avoid material waste caused by uniform thickness lining, while adapting to the stress requirements of pipelines with different deformations.

[0015] In a preferred embodiment, in step S2, the pressure resistance rating of the water-sealing airbag is ≥0.3MPa, and the outer wall of the water-sealing airbag is provided with a wear-resistant and anti-slip rubber layer.

[0016] It should be noted that the high-pressure airbag can adapt to fluctuations in water pressure inside the pipeline, preventing the airbag from slipping and leaking during construction; the anti-slip rubber layer on the outer wall increases the friction between the airbag and the pipe wall, ensuring the stability of the sealing.

[0017] In a preferred embodiment, in step S3, the inner lining blanket is fed in using a wet pneumatic method with a wellhead turning drum. The turning inflation pressure is 0.08–0.12 MPa, and the turning speed is 1.2–1.8 m / min.

[0018] It should be noted that the low-pressure slow-speed turning process is suitable for construction conditions of large-diameter pipelines and large spaces, avoiding problems such as wrinkles, displacement, and local accumulation during the turning process of the inner lining blanket, and ensuring that the thickness of the entire inner lining blanket is uniform.

[0019] In a preferred embodiment, in step S3, the mortar used for impregnation is a micro-expansion impermeable inorganic mortar, and the initial setting time of the mortar is controlled at 45-60 minutes.

[0020] It should be noted that micro-expansion mortar can offset the shrinkage of mortar during curing, preventing the lining itself from shrinking and cracking; the moderate initial setting time takes into account both the on-site construction operation time and the speed of early shaping.

[0021] In a preferred embodiment, in step S4, the pressure is stabilized and maintained at 0.06 MPa, the ambient temperature is controlled at 15–30°C, and the initial pressure stabilization and curing time is not less than 4 hours.

[0022] It should be noted that the constant low pressure supports the inner lining blanket throughout the entire process, offsetting the weight of the inner lining itself.

[0023] In a preferred embodiment, in step S4, the air pressure inside the pipe is monitored in real time during the maintenance process, and the pressure is immediately replenished if the pressure drop exceeds 0.01 MPa.

[0024] In a preferred embodiment, in step S5, the waterproof mortar sealing the pipe opening is mixed with a quick-setting waterproofing agent, and the thickness of a single sealing is not less than 50mm; the entire pipe is sealed and naturally cured for 72 hours before water can be used for testing.

[0025] The technical effects and advantages of the trenchless in-situ repair construction process for large-diameter composite pipes of this invention are as follows:

[0026] Compared to traditional light-cured hoses and ordinary sprayed mortar, the inner lining has higher overall ring stiffness, can directly bear the load of external soil, and has the dual functions of pipe wall corrosion protection and structural reinforcement. It can completely repair severe structural defects such as pipe cracking, misalignment, and settlement, and is suitable for complex working conditions of large-diameter pipelines with high soil cover.

[0027] The lining is firmly bonded to the original pipe wall, and the overall molding quality is excellent. The entire process is trenchless, relying only on existing manholes, resulting in minimal construction disturbance, short construction period, low overall repair cost, and strong municipal adaptability. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of an in-situ repair construction process for a large-diameter composite pipe without excavation, according to the present invention. Detailed Implementation

[0029] 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.

[0030] Example 1

[0031] Figure 1 This invention provides a trenchless in-situ repair process for large-diameter composite pipes, which includes the following steps:

[0032] Step S1: Perform endoscopic inspection of the entire target large-diameter composite pipe, mark the locations of pipe cracks, misalignments, corrosion, and settlement defects, and divide the pipe into slightly deformed, moderately deformed, and severely deformed sections based on the amount of deformation.

[0033] Step S2: Install water-stopping airbags at both ends of the inspection wells of the pipe section to be repaired, and build a temporary diversion pipeline to completely cut off the water flow in the pipe;

[0034] Step S3: Use double-layer fiberglass geotextile as the reinforcing matrix, completely impregnate the double-layer fiberglass geotextile with mortar to make an inner lining blanket, send the inner lining blanket into the pipe, and use air pressure to evenly expand the inner lining blanket so that the inner lining blanket fits the inner wall of the pipe.

[0035] Step S4: Maintain constant air pressure inside the pipeline for pressure stabilization and shaping, and allow the inner mortar to initially set and form under sealed conditions at room temperature.

[0036] Step S5: After depressurizing the water-sealing airbag, cut off the excess inner lining material at both ends of the pipe, seal the pipe ends with waterproof mortar, and allow it to cure naturally in a sealed manner.

[0037] In step S1, continuous scanning imaging using a CCTV robot is employed to record the depth of the defects and the length of circumferential cracks, and to determine the lining thickness parameters for different regions. In step S2, the pressure resistance of the water-sealing airbag is ≥0.3 MPa, and a wear-resistant, anti-slip rubber layer is installed on the outer wall of the water-sealing airbag. In step S3, the lining blanket is inserted using a wet pneumatic inversion method with a wellhead inversion drum, with an inversion inflation pressure of 0.08 MPa and an inversion speed of 1.2 m / min. In step S3, the mortar used for impregnation is a micro-expansion impermeable inorganic mortar, and the initial setting time is controlled at 45 min. In step S4, the pressure is maintained at 0.06 MPa for pressure stabilization and shaping, the ambient temperature is controlled at 15℃, and the initial pressure stabilization and curing time is no less than 4 hours. In step S4, the internal pressure is monitored in real time during the curing process, and pressure is immediately replenished if the pressure drop exceeds 0.01 MPa. In step S5, the waterproof mortar sealing the pipe opening is mixed with a quick-setting waterproofing agent, and the thickness of a single sealing is not less than 50mm; the entire pipe is sealed and naturally cured for 72 hours before water can be used for testing.

[0038] Example 2

[0039] Figure 1 This invention provides a trenchless in-situ repair process for large-diameter composite pipes, which includes the following steps:

[0040] Step S1: Perform endoscopic inspection of the entire target large-diameter composite pipe, mark the locations of pipe cracks, misalignments, corrosion, and settlement defects, and divide the pipe into slightly deformed, moderately deformed, and severely deformed sections based on the amount of deformation.

[0041] Step S2: Install water-stopping airbags at both ends of the inspection wells of the pipe section to be repaired, and build a temporary diversion pipeline to completely cut off the water flow in the pipe;

[0042] Step S3: Use double-layer fiberglass geotextile as the reinforcing matrix, completely impregnate the double-layer fiberglass geotextile with mortar to make an inner lining blanket, send the inner lining blanket into the pipe, and use air pressure to evenly expand the inner lining blanket so that the inner lining blanket fits the inner wall of the pipe.

[0043] Step S4: Maintain constant air pressure inside the pipeline for pressure stabilization and shaping, and allow the inner mortar to initially set and form under sealed conditions at room temperature.

[0044] Step S5: After depressurizing the water-sealing airbag, cut off the excess inner lining material at both ends of the pipe, seal the pipe ends with waterproof mortar, and allow it to cure naturally in a sealed manner.

[0045] In step S1, CCTV robots are used for continuous scanning imaging to record the depth of the defects and the length of the circumferential cracks, and the lining thickness parameters are determined for each region. In step S2, the pressure resistance of the water-sealing airbag is ≥0.3MPa, and a wear-resistant and anti-slip rubber layer is installed on the outer wall of the water-sealing airbag. In step S3, the lining blanket is inserted using a wet pneumatic inversion method with a wellhead inversion drum, with an inversion inflation pressure of 0.09MPa and an inversion speed of 1.3m / min. In step S3, the mortar used for impregnation is a micro-expansion impermeable inorganic mortar, and the initial setting time of the mortar is controlled at 48min. In step S4, the pressure is maintained at 0.06MPa for pressure stabilization and shaping, the ambient temperature is controlled at 18℃, and the initial pressure stabilization and curing time is no less than 4 hours. In step S4, the air pressure inside the pipe is monitored in real time during the curing process, and pressure is immediately replenished if the air pressure drops by more than 0.01MPa. In step S5, the waterproof mortar sealing the pipe opening is mixed with a quick-setting waterproofing agent, and the thickness of a single sealing is not less than 50mm; the entire pipe is sealed and naturally cured for 72 hours before water can be used for testing.

[0046] Example 3

[0047] Figure 1 This invention provides a trenchless in-situ repair process for large-diameter composite pipes, which includes the following steps:

[0048] Step S1: Perform endoscopic inspection of the entire target large-diameter composite pipe, mark the locations of pipe cracks, misalignments, corrosion, and settlement defects, and divide the pipe into slightly deformed, moderately deformed, and severely deformed sections based on the amount of deformation.

[0049] Step S2: Install water-stopping airbags at both ends of the inspection wells of the pipe section to be repaired, and build a temporary diversion pipeline to completely cut off the water flow in the pipe;

[0050] Step S3: Use double-layer fiberglass geotextile as the reinforcing matrix, completely impregnate the double-layer fiberglass geotextile with mortar to make an inner lining blanket, send the inner lining blanket into the pipe, and use air pressure to evenly expand the inner lining blanket so that the inner lining blanket fits the inner wall of the pipe.

[0051] Step S4: Maintain constant air pressure inside the pipeline for pressure stabilization and shaping, and allow the inner mortar to initially set and form under sealed conditions at room temperature.

[0052] Step S5: After depressurizing the water-sealing airbag, cut off the excess inner lining material at both ends of the pipe, seal the pipe ends with waterproof mortar, and allow it to cure naturally in a sealed manner.

[0053] In step S1, CCTV robots are used for continuous scanning imaging to record the depth of the defects and the length of circumferential cracks, and the lining thickness parameters are determined for different areas. In step S2, the pressure resistance of the water-sealing airbag is ≥0.3MPa, and a wear-resistant and anti-slip rubber layer is installed on the outer wall of the water-sealing airbag. In step S3, the lining blanket is inserted using a wet pneumatic inversion method with a wellhead inversion drum, with an inversion inflation pressure of 0.10MPa and an inversion speed of 1.6m / min. In step S3, the mortar used for impregnation is a micro-expansion impermeable inorganic mortar, and the initial setting time of the mortar is controlled at 55min. In step S4, the pressure is maintained at 0.06MPa for pressure stabilization and shaping, the ambient temperature is controlled at 25℃, and the initial pressure stabilization and curing time is no less than 4 hours. In step S4, the air pressure inside the pipe is monitored in real time during the curing process, and pressure is immediately replenished if the air pressure drops by more than 0.01MPa. In step S5, the waterproof mortar sealing the pipe opening is mixed with a quick-setting waterproofing agent, and the thickness of a single sealing is not less than 50mm; the entire pipe is sealed and naturally cured for 72 hours before water can be used for testing.

[0054] Example 4

[0055] Figure 1 This invention provides a trenchless in-situ repair process for large-diameter composite pipes, which includes the following steps:

[0056] Step S1: Perform endoscopic inspection of the entire target large-diameter composite pipe, mark the locations of pipe cracks, misalignments, corrosion, and settlement defects, and divide the pipe into slightly deformed, moderately deformed, and severely deformed sections based on the amount of deformation.

[0057] Step S2: Install water-stopping airbags at both ends of the inspection wells of the pipe section to be repaired, and build a temporary diversion pipeline to completely cut off the water flow in the pipe;

[0058] Step S3: Use double-layer fiberglass geotextile as the reinforcing matrix, completely impregnate the double-layer fiberglass geotextile with mortar to make an inner lining blanket, send the inner lining blanket into the pipe, and use air pressure to evenly expand the inner lining blanket so that the inner lining blanket fits the inner wall of the pipe.

[0059] Step S4: Maintain constant air pressure inside the pipeline for pressure stabilization and shaping, and allow the inner mortar to initially set and form under sealed conditions at room temperature.

[0060] Step S5: After depressurizing the water-sealing airbag, cut off the excess inner lining material at both ends of the pipe, seal the pipe ends with waterproof mortar, and allow it to cure naturally in a sealed manner.

[0061] In step S1, continuous scanning imaging using a CCTV robot is employed to record the depth of the defects and the length of circumferential cracks, and to determine the lining thickness parameters for different areas. In step S2, the pressure resistance rating of the water-sealing airbag is ≥0.3MPa, and a wear-resistant and anti-slip rubber layer is installed on the outer wall of the water-sealing airbag. In step S3, the lining blanket is inserted using a wet pneumatic inversion method with a wellhead inversion drum, with an inversion inflation pressure of 0.11MPa and an inversion speed of 1.7m / min. In step S3, the mortar used for impregnation is a micro-expansion impermeable inorganic mortar, and the initial setting time of the mortar is controlled at 55min. In step S4, the pressure is maintained at 0.06MPa for pressure stabilization and shaping, the curing environment temperature is controlled at 25℃, and the initial pressure stabilization curing time is no less than 4 hours. In step S4, the air pressure inside the pipe is monitored in real time during the curing process, and pressure is immediately replenished if the air pressure drops by more than 0.01MPa. In step S5, the waterproof mortar sealing the pipe opening is mixed with a quick-setting waterproofing agent, and the thickness of a single sealing is not less than 50mm; the entire pipe is sealed and naturally cured for 72 hours before water can be used for testing.

[0062] Example 5

[0063] Figure 1 This invention provides a trenchless in-situ repair process for large-diameter composite pipes, which includes the following steps:

[0064] Step S1: Perform endoscopic inspection of the entire target large-diameter composite pipe, mark the locations of pipe cracks, misalignments, corrosion, and settlement defects, and divide the pipe into slightly deformed, moderately deformed, and severely deformed sections based on the amount of deformation.

[0065] Step S2: Install water-stopping airbags at both ends of the inspection wells of the pipe section to be repaired, and build a temporary diversion pipeline to completely cut off the water flow in the pipe;

[0066] Step S3: Use double-layer fiberglass geotextile as the reinforcing matrix, completely impregnate the double-layer fiberglass geotextile with mortar to make an inner lining blanket, send the inner lining blanket into the pipe, and use air pressure to evenly expand the inner lining blanket so that the inner lining blanket fits the inner wall of the pipe.

[0067] Step S4: Maintain constant air pressure inside the pipeline for pressure stabilization and shaping, and allow the inner mortar to initially set and form under sealed conditions at room temperature.

[0068] Step S5: After depressurizing the water-sealing airbag, cut off the excess inner lining material at both ends of the pipe, seal the pipe ends with waterproof mortar, and allow it to cure naturally in a sealed manner.

[0069] In step S1, CCTV robots are used for continuous scanning imaging to record the depth of the defects and the length of the circumferential cracks, and the lining thickness parameters are determined for each region. In step S2, the pressure resistance of the water-sealing airbag is ≥0.3MPa, and a wear-resistant and anti-slip rubber layer is installed on the outer wall of the water-sealing airbag. In step S3, the lining blanket is inserted using a wet pneumatic inversion method with a wellhead inversion drum, with an inversion inflation pressure of 0.12MPa and an inversion speed of 1.8m / min. In step S3, the mortar used for impregnation is a micro-expansion impermeable inorganic mortar, and the initial setting time of the mortar is controlled at 60min. In step S4, the pressure is maintained at 0.06MPa for pressure stabilization and shaping, the ambient temperature is controlled at 30℃, and the initial pressure stabilization and curing time is no less than 4 hours. In step S4, the air pressure inside the pipe is monitored in real time during the curing process, and pressure is immediately replenished if the air pressure drops by more than 0.01MPa. In step S5, the waterproof mortar sealing the pipe opening is mixed with a quick-setting waterproofing agent, and the thickness of a single sealing is not less than 50mm; the entire pipe is sealed and naturally cured for 72 hours before water can be used for testing.

[0070] In-situ repair of large-diameter composite pipes was performed through Examples 1-5. The repair effect was tested, and the results are shown in the table below:

[0071] Example 1 1.62 19.3 Example 2 1.77 20.5 Example 3 1.95 24.8 Example 4 1.82 22.6 Example 5 1.78 19.8

[0072] The bonding strength is the bonding strength between the lining and the original pipe wall; the ring stiffness is the overall ring stiffness of the composite pipe after repair. As can be seen from the table above, the bonding strength and ring stiffness of the lining are optimal under the process parameters of Example 3, which is the optimal embodiment of the present invention.

[0073] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0074] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A trenchless in-situ repair construction process for large-diameter composite pipes, characterized in that, Includes the following steps: Step S1: Perform endoscopic inspection of the entire target large-diameter composite pipe, mark the locations of pipe cracks, misalignments, corrosion, and settlement defects, and divide the pipe into slightly deformed, moderately deformed, and severely deformed sections based on the amount of deformation. Step S2: Install water-stopping airbags at both ends of the inspection wells of the pipe section to be repaired, and build a temporary diversion pipeline to completely cut off the water flow in the pipe; Step S3: Use double-layer fiberglass geotextile as the reinforcing matrix, completely impregnate the double-layer fiberglass geotextile with mortar to make an inner lining blanket, send the inner lining blanket into the pipe, and use air pressure to evenly expand the inner lining blanket so that the inner lining blanket fits the inner wall of the pipe. Step S4: Maintain constant air pressure inside the pipeline for pressure stabilization and shaping, and allow the inner mortar to initially set and form under sealed conditions at room temperature. Step S5: After depressurizing the water-sealing airbag, cut off the excess inner lining material at both ends of the pipe, seal the pipe ends with waterproof mortar, and allow it to cure naturally in a sealed manner.

2. The in-situ repair construction process for large-diameter composite pipes without excavation according to claim 1, characterized in that: In step S1, CCTV robots are used for continuous scanning imaging to record the depth of the disease and the length of the circumferential crack, and the lining thickness parameters are determined for different regions.

3. The in-situ repair construction process for large-diameter composite pipes without excavation according to claim 2, characterized in that: In step S2, the pressure resistance rating of the water-sealing airbag is ≥0.3MPa, and the outer wall of the water-sealing airbag is provided with a wear-resistant and anti-slip rubber layer.

4. The in-situ repair construction process for trenchless large-diameter composite pipes according to claim 3, characterized in that: In step S3, the inner lining blanket is fed into the wellhead using a wet pneumatic method with a rotating drum. The rotating air pressure is 0.08-0.12 MPa, and the rotating speed is 1.2-1.8 m / min.

5. The in-situ repair construction process for trenchless large-diameter composite pipes according to claim 4, characterized in that: In step S3, the mortar used for impregnation is a micro-expansion impermeable inorganic mortar, and the initial setting time of the mortar is controlled at 45-60 minutes.

6. The in-situ repair construction process for trenchless large-diameter composite pipes according to claim 5, characterized in that: In step S4, the pressure is stabilized and maintained at 0.06 MPa, the ambient temperature is controlled at 15-30℃, and the initial pressure stabilization and curing time is no less than 4 hours.

7. The in-situ repair construction process for large-diameter composite pipes without excavation according to claim 6, characterized in that: In step S4, the air pressure inside the pipe is monitored in real time during the maintenance process. If the air pressure drops by more than 0.01 MPa, the pressure is immediately replenished.

8. The in-situ repair construction process for trenchless large-diameter composite pipes according to claim 7, characterized in that: In step S5, the waterproof mortar sealing the pipe opening is mixed with a quick-setting waterproofing agent, and the thickness of a single sealing is not less than 50mm; the entire pipe is sealed and naturally cured for 72 hours before water can be used for testing.

Images