Method for transforming and repairing pipeline system of old community

Abstract

The invention discloses an old community pipeline system transformation and repair method, and belongs to the technical field of municipal engineering construction. The method comprises the steps that checking and fixed-point paying-off are conducted on current pipelines and environments; judging whether new construction or repair conditions exist or not according to pipeline conditions; a non-excavation repairing technology is adopted for repairing the pipeline which does not have excavation and new construction conditions; a micro pipe jacking process is adopted for construction for areas which have new construction conditions but are limited by buildings or narrow road sections and cannot be excavated; as for the area with the excavation condition, groove excavation is conducted, and the current pipeline is protected through a herringbone support suspension or movable steel plate supporting technology; a rain and sewage diverter is installed at the vertical pipe to achieve source diverting. Various key technologies are comprehensively applied, the problems that underground pipelines of old communities are complex, the operation space is limited, potential safety hazards are large, and rainwater and sewage are mixed are solved, and the method has the advantages of being high in construction speed, low in potential safety hazards, capable of saving cost and the like.

Description

Technical Field

[0001] This invention relates to the field of municipal engineering construction technology, and in particular to a method for the renovation and repair of pipeline systems in old residential areas. Background Technology

[0002] Many problems exist in old urban residential communities in my country, resulting in a massive demand for renovation. The national comprehensive launch of the urban old residential community renovation plan marks a new stage in the development of my country's construction industry, emphasizing both new construction and reinforcement / renovation. For old residential communities, both rainwater and sewage have different impacts. Rainwater can be directly utilized, such as for road cleaning and plant irrigation, but sewage is different. It generally needs to be treated by relevant treatment systems to meet standards before discharge. From this perspective, the cost of treating rainwater and sewage is vastly different. Residents in old communities often discharge sewage and rainwater together. Therefore, sewage treatment is relatively difficult, and even if it is possible, the cost is high. Thus, rainwater and sewage problems remain a common challenge in old residential communities. If rainwater and sewage flow into waterways or rivers, it will have a certain impact on water quality. Many old residential communities are located near industrial areas, where industrial production discharges large amounts of sewage with even more serious impacts, contributing significantly to current environmental problems. Furthermore, this is inconsistent with my country's sustainable development philosophy. The main idea behind implementing rainwater and sewage separation renovations in older residential communities is to separate rainwater from sewage. This reduces the burden on sewage treatment systems, minimizes the environmental impact of sewage, and creates a high-quality living environment for residents of older communities.

[0003] Traditional open-cut construction faces numerous challenges: First, the underground pipelines in older residential areas are intricate and complex, making mechanical excavation highly susceptible to damage. Second, narrow roads and dense buildings in these areas prevent large machinery from accessing the sites, and deep trench excavation poses serious safety hazards. Third, traditional construction methods are time-consuming, significantly disrupting residents' travel and daily lives. Furthermore, replacing all old pipelines through open excavation is costly and generates substantial construction waste. Current conventional renovation solutions struggle to simultaneously address construction safety, efficiency, cost, and environmental impact. Therefore, a comprehensive construction method integrating trenchless repair, minimally invasive installation, pipeline protection, and efficient diversion technologies is urgently needed to overcome these technical bottlenecks. Summary of the Invention

[0004] This invention addresses the shortcomings of existing technologies by developing a method for the renovation and repair of pipeline systems in old residential communities. Through a number of targeted strategies, it reduces trench excavation, shortens the construction period, and lowers costs.

[0005] The technical solution of this invention to solve the technical problem is: a method for renovating and repairing pipeline systems in old residential areas, comprising the following steps: S1. On-site pipeline survey and location: Detect and verify the existing drainage pipes, water supply pipes, power pipes and gas pipes in the construction area, and determine the location of wells and pipelines. S2. Construction plan decision-making: Based on the extent of pipeline damage and the site environment, determine whether the pipeline should be repaired or newly built. If new construction is required, further determine whether the conditions for excavation are met. S3. Classified construction: If the pipeline is damaged and there is no condition for new construction, the existing pipeline is repaired in situ using trenchless repair technology. If a new pipeline needs to be built but the ground does not have the conditions for excavation, the micro-pipe jacking process is used for underground laying. If a new pipeline needs to be built and the conditions for excavation are available, trench excavation is carried out, and the existing pipeline is suspended for protection or supported during the excavation process. S4. Rainwater and sewage separation renovation: Install rainwater and sewage separators at the building's riser to separate rainwater and sewage into the corresponding pipes; S5. Connection and backfilling: After completing the pipeline installation and manhole connection, backfilling is carried out in layers after passing the water tightness test.

[0006] In S3, the non-excavation repair technology specifically includes: When the pipeline defect ranges to the entire line or the number of defect points is three or more, ultraviolet light curing repair technology is used. A glass fiber hose is pulled into the pipeline to be repaired and cured by ultraviolet light to form an inner lining. When a pipe has local ruptures or deformations and the pipe diameter is less than 1 meter, point-based in-situ curing repair technology is used, which uses airbags to press resin-impregnated glass fiber fabric onto the defect and cure it. When there are local defects in the pipeline and the pipe diameter is greater than or equal to 1 meter, the stainless steel double expansion ring repair technology is adopted, which uses a hydraulic device to expand and fix the stainless steel inner lining plate to the inside of the pipe wall.

[0007] In S3, the specific steps of the micro-jacking process are as follows: the prefabricated working well is sunk, and the guide hole is used for guidance. Each time the hole is enlarged, the height is raised according to the design elevation to eliminate the influence of the drill bit sinking. After the pipeline is in place, the method of first jacking and then pulling is adopted. First, the hydraulic device is used to jack the pipeline to make the interface connection tight, and then the drilling rig is used to drag the pipeline forward. Finally, the bottom of the caisson is sealed and the opening is sealed.

[0008] In S3, the protective measures implemented for existing pipelines during the excavation process include: A-frame suspension protection: After the test pit is excavated, an A-frame is erected using steel pipes or square timber, and the exposed existing pipelines are suspended and fixed by slings; Mobile steel plate support: When the working height is limited or the trench width changes, mobile steel plate supports with adjustable width are used for temporary retaining support.

[0009] In S4, the rainwater and sewage separator is connected to the combined riser and is equipped with a buoyancy ball linkage device inside. Small flow sewage is discharged through the lower sewage outlet. When a large flow of water enters, the buoyancy ball rises with the water level and drives the linkage device to close the sewage outlet, so that the water flow is switched to the rainwater outlet.

[0010] In S5, the connection between the pipeline and the inspection well adopts the saddle joint anti-leakage technology; the specific operation is as follows: select the saddle joint with the corresponding curvature according to the outer diameter of the branch pipe and the diameter of the well, open the hole on the well using a hole opener, put the saddle seat and washer into the well, place the pressure ring on the outside of the well, and tighten the connection by external screwing structure.

[0011] During the installation of fiberglass flexible hoses, a pipe support tool is used for internal support. The pipe support tool includes a main body and a support assembly. The main body has through holes on both sides, and the support assembly is telescopically connected to the through holes. The length of the support assembly can be adjusted to accommodate pipes of different diameters.

[0012] During the backfilling process in S5, manual backfilling is used within 50cm above the pipe top foundation, combined with compaction by a small impact rammer. The thickness of the backfill material is controlled by the scale layer control method. The thickness of the first layer is controlled within 25cm, and the thickness of each subsequent layer is no more than 20cm.

[0013] The effects described in the invention are merely those of the embodiments, and not all the effects of the invention. The above technical solutions have the following advantages or beneficial effects: 1. This invention solves the safety hazards and foundation disturbance problems associated with traditional open-cut construction in confined spaces. Traditional renovations of old residential areas often employ large-scale excavation, which, due to narrow roads, dense buildings, and shallow foundations, easily leads to trench collapse and even causes foundation settlement or cracking of surrounding buildings. Furthermore, underground water, electricity, and gas pipelines are intricately intertwined due to long-term construction, making mechanical excavation prone to severing existing pipelines and causing safety accidents. This invention comprehensively utilizes micro-jacking technology and trenchless repair technology, completely avoiding road surface damage and foundation disturbance in areas where excavation is not feasible, thus eliminating the safety hazards of deep trench operations. Simultaneously, in complex road sections where excavation is necessary, the introduction of A-frame suspension protection and mobile steel plate support technology enables in-situ protection of existing pipelines and on-site support of the trench during excavation, effectively preventing pipeline breakage and soil collapse, fundamentally ensuring construction safety. 2. This invention overcomes the challenges of high-altitude operations in riser pipe renovation, achieving low-cost and high-efficiency source separation. Existing rainwater and sewage separation renovations typically require the demolition and reconstruction of building risers, involving extensive high-altitude work. This is not only difficult and risky, but also causes significant disturbance to residents, has a long construction period, and extremely high labor costs. This invention utilizes building diverter technology, eliminating the need for large-scale high-altitude modifications to existing risers; a diverter is simply installed at the bottom of the riser. This device uses a buoyancy ball linkage principle to automatically switch the rainwater and sewage discharge paths according to flow rate. This method completely eliminates the safety hazards of high-altitude operations, significantly shortens the construction period, and substantially reduces construction costs. 3. This invention overcomes the common quality problems of leakage and deformation in traditional pipe connection and backfilling processes. In traditional construction, gaps often appear at the connection between pipes and manholes due to uneven settlement or rough construction, leading to leakage. In micro-jacking construction, the pipe joints are often not tight enough due to simple jacking. Furthermore, large-diameter flexible pipes lack internal support during backfilling and are easily deformed under pressure. This invention addresses connection leakage by using a leak-proof saddle joint, utilizing mechanical opening and a spiral clamping structure to ensure a tight connection between the branch pipe and the manhole, effectively preventing groundwater infiltration or sewage leakage. For the jacking pipe joint, a micro-jacking first-jacking-then-pulling process is proposed, using hydraulic jacking to ensure a tight joint before pulling, solving the problem of loose joints in traditional pipe pulling processes. Regarding pipe deformation, adjustable and simple support tools are introduced in the construction of flexible pipes, and the scale layer control method and manual compaction process are strictly implemented during the backfilling stage, effectively preventing the flexible pipes from flattening and deforming under the pressure of the backfill soil, ensuring the flow capacity and service life of the pipes. 4. This invention achieves a dual improvement in construction efficiency and social benefits. Traditional excavation and repair methods cause prolonged traffic disruptions in residential areas, and the resulting noise and dust severely impact residents' daily lives. Furthermore, the need to treat mixed wastewater not only increases the burden on wastewater treatment plants but also raises government expenditures. The integrated construction method of this invention features rapid construction and a small footprint, minimizing the impact on residents' lives and traffic. Simultaneously, through precise rainwater and wastewater separation, it achieves clear water and wastewater separation, significantly reducing the treatment load on wastewater treatment plants, resulting in significant environmental and long-term economic benefits. 5. This invention addresses the problem of insufficient guiding accuracy in complex geological conditions for micro-jacking. In old residential areas with complex geological conditions, the drill bit is prone to sinking due to gravity or geological formations, leading to water accumulation in the pipeline and affecting the drainage slope. This invention proposes a control method combining geophysical exploration, two boreholes, and pre-raising of the guiding elevation. By predicting a 5-6cm elevation increase with each borehole enlargement, the drill bit sinking is effectively offset, ensuring that the drainage slope after pipe completion accurately meets design requirements and guarantees smooth drainage. Attached Figure Description

[0014] Figure 1 This is a flowchart illustrating the construction process of the present invention. Figure 2 This is a structural diagram of the pipe support tool; Figure 3 Diagram showing the usage status of pipe support tools; Figure 4 A schematic diagram of the cantilever protection construction of the A-frame scaffold.

[0015] The components include: 1. Main body; 2. Supporting components; 3. Existing pipelines; 4. New pipelines. Detailed Implementation

[0016] To clearly illustrate the technical features of this solution, the invention will be described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0017] Example 1 See Figures 1 to 4 A method for renovating and repairing the pipeline system of an old residential community includes the following steps: S1. On-site pipeline survey and location: When implementing rainwater and sewage separation pipeline network renovation in existing old residential areas, a comprehensive survey and verification of existing drainage pipes, water supply pipes, power pipes, telecommunications pipes, and gas pipes is required. Special attention should be paid to verifying the horizontal position, elevation, and cross-sectional dimensions of pipes connecting upstream and downstream to the pipelines in this design. Before laying the interceptor sewer pipe, surveyors should determine the location of its upstream pipe and other data, and determine the location of the interceptor well and interceptor sewer pipe on-site. Based on the designed well location coordinates, the locations of the inspection wells and pipelines are marked out using measuring instruments. At the same time, the trench excavation depth and cross-sectional width are calculated based on the pipe bottom elevation and slope coefficient requirements.

[0018] S2. Construction plan decision-making: Based on the extent of pipeline damage and the site environment, determine whether the pipeline should be repaired or newly built. If new construction is required, further determine whether the conditions for excavation are met. S3. Categorized construction: If the pipeline is damaged and new construction is not feasible, trenchless repair technology is used to repair the existing pipeline in situ. Trenchless repair technology includes UV curing repair technology, point-based in-situ curing repair technology, and stainless steel double expansion ring repair technology. When the pipeline defect covers the entire line or the number of defect points is three or more, UV curing repair technology is used. UV curing repair technology involves pulling the rolled glass fiber flexible tubing into the pipeline to be repaired, curing it with UV light, and completing the repair. This eliminates the need for scaffolding, turning, and water usage, achieving the advantages of environmental protection, economy, and 100% trenchless repair. During the construction of glass fiber pipelines, a flexible pipeline simple support tool is used, including a main body 1 and a support component 2. Through holes are provided on two sides, connecting to the other side of the main body 1. The support component 2 can be telescopically connected to the through holes on both sides. Adjustable support component 2 is suitable for supporting flexible pipes of different diameters. Point-based in-situ curing repair technology is used for pipes with minor defects such as cracks, deformations, disconnections, and corrosion, and whose diameter is <DN1000. First, fiberglass fabric is impregnated with resin, then wrapped around a pipe lining repair device and sent to the damaged area. Under monitoring, the repair device is inflated with air to adhere it to the pipe wall. After curing, it reinforces the original pipe. Stainless steel double expansion ring repair technology is used for pipes with minor defects such as cracks, deformations, disconnections, and corrosion, and whose diameter is ≥DN1000. This technology involves first cleaning the sewage pipe, then sending a special stainless steel lining plate to the damaged area, manually installing it, and adhering it to the pipe wall. After successful installation, it reinforces the original pipe.

[0019] If a new pipeline needs to be constructed but the ground conditions are not suitable for excavation, a micro-jacking process is used for underground laying. The specific steps of the micro-jacking process are as follows: a prefabricated working shaft is sunk, and the pipeline is guided by a directional borehole. Each time the borehole is enlarged, the elevation is raised by a predetermined height according to the design elevation to eliminate the impact of drill bit sinking. After the pipeline is in place, a jacking-then-pulling method is adopted. First, the pipeline is jacked in using a hydraulic device to ensure a tight connection at the joint, and then the pipeline is pulled forward by a drilling rig. Finally, the bottom of the caisson is sealed and the opening is enclosed. During the operation: according to geological conditions and experimental results, raising the elevation by 5-6 cm according to the design elevation each time the directional borehole is enlarged can effectively eliminate the impact of drill bit sinking, allowing the pipeline to smoothly enter the opening position when jacked and pulled. During the drilling of the guide rod, the straight section must first enter the two openings of the working well to ensure the straightness of the drill rod and avoid curves. The elevation of the drill rod is controlled in real time using geophysical instruments to ensure the slope of the water flow. To prevent the rubber ring from being damaged by compression during the pipe jacking process, lubricant must be applied to the pipe joint when the pipe is lowered. To prevent the pipe joint from being loose when pulling the pipe, a jacking-then-pulling method is adopted, that is, after the pipe is in place, a hydraulic device is used to jack the pipe to make the pipe joint connection tight, and then the drilling rig pulls the pipe forward. The sealing of the working well opening is an important quality control point. To prevent water leakage at the opening, the prefabricated assembly process of the inspection well is used to seal the inside of the working well to ensure the airtightness of the opening.

[0020] If new pipelines are to be constructed and excavation conditions are met, trench excavation will be carried out. During the excavation process, existing pipeline 3 will be suspended for protection or support. A-frame cantilever protection is implemented after the exploratory pit is excavated, using a rigid suspension method to protect the existing pipeline and reinforce it. During construction, steel pipes or square timber will be used to construct A-frame supports for suspension to ensure that existing pipeline 3 does not sink. Mobile steel plate support technology is used for shallow trenches within the community, with retaining plates for support. For deeper road trenches, Larssen steel sheet piles will be used for support. When the working height is limited, movable retaining plates will be used for temporary support. The movable steel plates will be manufactured according to the trench width to prevent trench collapse and ensure operational safety.

[0021] S4. Rainwater and sewage separation renovation: Rainwater and sewage separators are installed at the building's risers to separate rainwater and sewage into corresponding pipes. The application of building separators changes the traditional method of high-altitude construction of outdoor drainage risers in old residential areas, eliminating the safety hazards of high-altitude work. Construction is fast, the construction period is short, and the cost is low. The building separator connects to the combined riser and automatically switches modes based on the inflow rate to achieve the purpose of separating rainwater and sewage. On sunny days, the sewage pipe mainly contains balcony wastewater, and the volume is small. After passing through the building separator, it enters the sewage pipe. On rainy days, the inflow is larger, the water level in the separator rises, and the float in the separator rises due to buoyancy, which drives the linkage device to close the sewage outlet, and the rainwater enters the rainwater pipe. S5. Connection and Backfilling: After completing the pipeline installation and manhole connection, and passing the water tightness test, backfilling is carried out in layers. The connection between the pipeline and the manhole adopts the saddle joint leak-proof technology. The specific operation is as follows: select the saddle joint with the corresponding curvature according to the outer diameter of the branch pipe and the diameter of the manhole. Use a hole opener to open the hole in the manhole, put the saddle seat and washer into the manhole, place the pressure ring on the outside of the manhole, and tighten the connection by external screwing. Before backfilling, check the pipeline for damage or deformation. Damaged pipelines should be repaired or replaced. The backfill material is controlled by the scale layer control method to control the backfill thickness. Manual backfilling must be used, and small impact tampers must be used to ensure compaction. Mechanical bulldozing and compaction with road rollers are strictly prohibited.

[0022] Although the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Based on the technical solutions of the present invention, various modifications or variations that can be made by those skilled in the art without creative effort are still within the scope of protection of the present invention.

Claims

1. A method for renovating and repairing pipeline systems in old residential communities, characterized in that, Includes the following steps: S1. On-site pipeline survey and location: Detect and verify the existing drainage pipes, water supply pipes, power pipes and gas pipes in the construction area, and determine the location of wells and pipelines. S2. Construction plan decision-making: Determine the construction plan based on the extent of pipeline damage and the site environment; S3. Classified construction, and implement at least one of the following construction methods: If the pipeline is damaged and there is no new construction condition, use non-excavation repair technology to repair the existing pipeline in situ; if a new pipeline needs to be built but the ground does not have the conditions for excavation, use micro-jacking technology to lay underground; if a new pipeline needs to be built and there are the conditions for excavation, carry out trench excavation, and implement suspension protection or support for the existing pipeline (3) during the excavation process. S4. Rainwater and sewage separation renovation: Install rainwater and sewage separators at the building's riser to separate rainwater and sewage into the corresponding pipes; S5. Connection and backfilling: After completing the pipeline installation and manhole connection, backfilling is carried out in layers after passing the water tightness test.

2. The method for renovating and repairing pipeline systems in old residential areas according to claim 1, characterized in that, In S3, the non-excavation repair technology specifically includes: When the pipeline defect range is the entire line or the number of defect points is 3 or more, ultraviolet light curing repair technology is used. The fiberglass hose is pulled into the pipeline to be repaired and cured by ultraviolet light to form an inner lining. When a pipe has local ruptures or deformations and the pipe diameter is less than 1 meter, point-based in-situ curing repair technology is used, which uses airbags to press resin-impregnated glass fiber fabric onto the defect and cure it. When there are local defects in the pipeline and the pipe diameter is greater than or equal to 1 meter, the stainless steel double expansion ring repair technology is adopted, which uses a hydraulic device to expand and fix the stainless steel inner lining plate to the inside of the pipe wall.

3. The method for renovating and repairing pipeline systems in old residential areas according to claim 1, characterized in that, In S3, the specific steps of the micro-jacking process are as follows: the prefabricated working well is sunk, and the guide hole is used for guidance. Each time the hole is enlarged, the height is raised according to the design elevation to eliminate the influence of the drill bit sinking. After the pipeline is in place, the method of first jacking and then pulling is adopted. First, the hydraulic device is used to jack the pipeline to make the interface connection tight, and then the drilling rig is used to drag the pipeline forward. Finally, the bottom of the caisson is sealed and the opening is sealed.

4. The method for renovating and repairing pipeline systems in old residential areas according to claim 1, characterized in that, In S3, the protective measures implemented for the existing pipeline (3) during the excavation process include: A-frame suspension protection: After the exploratory pit is excavated, an A-frame is erected using steel pipes or square timber, and the exposed existing pipeline (3) is suspended and fixed by slings; Mobile steel plate support: When the working height is limited or the trench width changes, mobile steel plate supports with adjustable width are used for temporary retaining support.

5. The method for renovating and repairing pipeline systems in old residential areas according to claim 1, characterized in that, In S4, the rainwater and sewage separator is connected to the combined riser and is equipped with a buoyancy ball linkage device inside; sewage is discharged through the lower sewage outlet; when water enters, the buoyancy ball rises with the water level and drives the linkage device to close the sewage outlet, so that the water flow is switched to the rainwater outlet.

6. The method for renovating and repairing pipeline systems in old residential areas according to claim 1, characterized in that, In S5, the connection between the pipeline and the inspection well adopts the saddle joint anti-leakage technology; the specific operation is as follows: select the saddle joint with the corresponding curvature according to the outer diameter of the branch pipe and the diameter of the well, open the hole on the well using a hole opener, put the saddle seat and washer into the well, place the pressure ring on the outside of the well, and tighten the connection by external screwing structure.

7. A method for renovating and repairing pipeline systems in old residential areas according to claim 2, characterized in that, During the installation of the fiberglass hose, a pipe support tool is used for internal support. The pipe support tool includes a main body (1) and a support component (2). The main body (1) has through holes on both sides, and the support component (2) can be telescopically connected to the through holes. The length of the support component (2) can be adjusted to accommodate pipes of different diameters.

8. The method for renovating and repairing pipeline systems in old residential areas according to claim 1, characterized in that, In the backfilling process described in S5, manual backfilling is used within 50cm above the pipe top foundation, combined with compaction by a small impact rammer. The thickness of the backfill material is controlled by the scale layer control method, with the first layer loosely laid to a thickness of no more than 25cm, and each subsequent layer not exceeding 20cm in thickness.

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