Trenchless repair method and system for lining buried water supply and drainage pipelines

Abstract

The present invention discloses a trenchless repair method and system for the lining of buried water supply and drainage pipelines. The adjacent interfaces of the lining short pipes are connected by internal and external threads for water-bearing operation, which greatly shortens the construction period and reduces the impact of water interruption during repair. The quick-thread interface becomes tighter as the jacking force increases, and there is no phenomenon of stretching and loose sleeve. Circumferential rubber rings that expand upon contact with water are provided on both end faces of the threads to achieve zero leakage throughout the process. The lining construction adopts the combination method of "pulling from the front and pushing from the back" to reduce the frictional resistance along the way and overcome the problem of offset obstacles, realizing smooth insertion and accelerating the construction speed. The construction accuracy is guaranteed by using laser-guided axial measurement control technology to accurately control the elevation of the lining pipe section routing. The gap layer between the inner and outer pipe walls for pipe stabilization grouting adopts the method of observing grouting through observation holes and layered perfusion to ensure the thickness and density of the grout layer. During the construction process, the pipeline bottom mud and construction slurry water dredged are treated in-situ by a vehicle-mounted integrated device for treating sludge and sewage, eliminating the need for sludge transportation and saving the consumption of water for sewage dredging.

Description

Technical Field

[0001] The present invention belongs to the field of urban buried water supply and drainage pipelines, and relates to a trenchless repair method and system for lining buried water supply and drainage pipelines. Background Art

[0002] As an important public infrastructure, urban water supply and drainage pipelines play a significant role in ensuring water supply, eliminating waterlogging, flood control and disaster reduction, and reducing pollution. Taking buried drainage pipelines as an example, during the operation process, various internal and external factors such as long-term dynamic and static loads applied by road vehicles, reduced compaction degree of the backfill soil on the pipe top, poor toughness of plastic pipes, corrosion by polluted gases in water, aging and embrittlement of the interface rubber rings, and softening and settlement of the pipe bottom foundation will cause various structural defects such as corrosion and cracking of the pipe wall, structural cracks and deformation of the pipe wall, disconnection and dislocation of the pipe joints, and uneven settlement of the pipe foundation resulting in pipeline undulation. Compared with functional defects such as dirt deposition at the pipe bottom, scaling on the pipe wall, and floating scum on the water surface, structural defects will accelerate the aging and structural damage of the pipeline, forming potential safety hazards such as groundwater leakage pollution, road cavity diseases, and road surface subsidence and collapse. Seriously, the collapse and cavity of the road surface will cause road vehicles and pedestrians to suddenly fall in, resulting in life safety accidents.

[0003] If most of the buried defective pipelines are located in areas with heavy traffic, sensitive environment, limited construction space, etc., it is preferably to use trenchless repair technology. During the construction process of various trenchless methods, the biggest problem encountered is the overall structural repair of the pipeline. The inner wall of the pipeline is severely corroded and cracked, or the pipeline is deformed greatly under long-term pressure, and the pipeline structure is damaged, with large defects in stiffness, toughness and structural stability. It can no longer bear the external soil pressure, dynamic load, groundwater level pressure and internal flowing water pressure for a long time. To avoid the traffic impact and site impact caused by trenching and burying pipes and in-situ drainage, using trenchless methods to conduct overall structural renewal or replacement is called overall structural repair. The repair objects are mostly old and cracked reinforced concrete pipelines with a pipe age close to or exceeding 20 years. For such repairs, the construction process is numerous, the process is complex, the material grade and pipeline interface sealing requirements are high, and it is required that the formed lining pipe after repair does not affect the original water passing area and flow rate.

[0004] When the diameter of the old defective pipeline is greater than 800mm, the operator can enter the pipe, level the dislocation defects, and use artificial repair methods such as wall lining. However, for the repair of small and medium-sized pipelines with a diameter of less than 800mm, the operator cannot enter. If the resin in-situ curing method or spraying method is used, the structural thickness is limited (less than 16mm), and it is impossible to achieve a stable self-sustaining structural layer on the inner wall of the old defective pipeline. The structural repair of such pipelines has always been a difficult problem in the industry. For pipelines of this caliber, traditional overall structural repair methods mostly use pipeline lining reinforcement technology. Lining pipes are mostly made of high-density polyethylene (HDPE) winding structural wall pipes, glass fiber reinforced plastic sand-filled pipes (continuous winding, centrifugal casting, fixed-length winding), resin concrete pipes, polyethylene (PE) solid wall pipes for water supply, polyethylene (PE) solid wall pipes for water supply, SS316 stainless steel sleeves and other lightweight thin-walled short pipes; the lining method is to continuously follow up and insert multiple short pipes in series to form a connected whole; the interface method mostly uses traditional elastic rubber ring sealing interfaces. The lining formed by connecting multiple short lining pipes is used to reinforce a certain part of the old defective pipeline or the entire length, and independently bear all the pressure inside and outside the original pipeline.

[0005] Limited to the traditional liner short pipe interface method, the insertion method mostly uses a small hydraulic jack in the well to push and push. If the route encounters the dislocation and disconnection of the interface of the old and defective pipeline, the jacking will be blocked, and there is no axial measurement control during the jacking process, and the deviation is large. Whether it is a socket joint, a full-width sleeve joint, or a fusion welding joint, in order to protect the interface structure and avoid the formation of an interface gap that is too large to cause stretching and disconnection, the jacking method is generally used. During the route, if the old and defective pipeline interface is dislocated or disconnected, the liner section will be subject to the jacking force of the dislocated part and cannot continue to push. For old pipelines with an inner diameter greater than 800mm, construction personnel can enter to treat the obstructed part to make it smooth and easy to push in; for the case of an inner diameter less than 800mm, due to the size of the pipe diameter, construction personnel cannot enter to level the obstructed interface, which will cause delays in the construction period and fail to complete the repair normally. In addition, the traditional jacking construction method does not have accurate axial measurement and control means, and it is easy to form horizontal and height deviations between the designed central axis of the old pipeline and the central axis of the liner section. This deviation not only causes the slope of the liner pipe to be uneven, but also causes the thickness of the annular gap between the outer wall of the liner pipe and the inner wall of the old pipe to be uneven. After the jacking is completed, when cement mortar needs to be injected into this annular gap, it cannot be guaranteed to be filled evenly and densely. If it cannot be filled densely, the unbalanced pressure of the liner section during the operation stage will cause the pipeline to stretch and deform axially, and the operation quality cannot be guaranteed. Summary of the invention

[0006] Based on this, in view of the deficiencies in the prior art, the object of the present invention is to provide a method and system for trenchless repair of the lining of buried water supply and drainage pipes.

[0007] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] On the one hand, the present invention provides a trenchless repair method for lining buried water supply and drainage pipelines, which repairs the drainage pipeline located between two manholes. Among them, the two manholes are divided into an upstream manhole and a downstream manhole according to the fluid flow direction, and the method includes:

[0009] Step S1: Temporarily cut off the water and block the water outlet pipeline of the manhole in front of the upstream manhole and the water inlet pipeline of the manhole behind the downstream manhole. Lead the sludge water in the manhole in front of the upstream manhole to the rear end of the manhole behind the downstream manhole through the temporary drainage equipment to ensure the normal flow of upstream water during the pipeline repair;

[0010] Step S2: After completing the above temporary water cut-off measures, on the premise of ensuring the dry pipe of the drainage pipeline to be repaired, conduct a wired closed-circuit television inspection on it through a pipeline robot. A line camera and a searchlight lamp that make up the pipeline inspection closed-circuit television system are mounted on the pipeline robot, and it travels in the pipeline to be repaired and records the inner wall image, and identifies and records the structural defect parts such as cracks, deformations, dislocations, disconnections, leaks, and corrosion detected;

[0011] Step S3: Pretreat the defect parts such as interface dislocation, disconnection, and leakage points detected on the inner wall of the pipeline;

[0012] Step S4: According to the "Technical Specification for Inspection and Assessment of Urban Drainage Pipelines", judge the types, quantities, and grades of defects in the entire pipeline to be repaired, so as to determine whether overall structural repair is required;

[0013] Step S5: If it is judged that structural repair is required, set a lining tubular structure in the pipeline to be repaired. When setting it, the lining tubular structure enters the pipeline to be repaired in the form of several lining short pipes. The two ends of the lining short pipe are respectively provided with internal threads and external threads. The front and rear lining short pipes are quickly screwed together through these threads and are assisted by a water-swellable circumferential rubber ring to increase the water-stop sealing performance. The wall thickness at the thread interface is relatively thick, and its ring stiffness and ring flexibility are not less than those of the pipeline body to be repaired, which can achieve zero leakage. The pipe diameter at the thread connection part does not shrink and is completely straight and smooth;

[0014] Step S6: During the construction process, the whole-process laser-guided axis measurement and control technology is adopted to strictly control the horizontal and vertical displacement deviations of the lined pipeline, accurately control the axial trajectory of the pipeline to control the routing elevation and the bottom slope of the pipeline of the lined pipe section, ensure that the smooth slope-direction gravity flow state is maintained after the repair, and the "pulling from the front and pushing from the back" combined construction method is adopted for the insertion of the short lined pipe. The jacking cylinder at the rear end provides the thrust, and the soft rope of the winch at the front end provides the traction force. Under the combined action of the two, the resistance of the misalignment at the interface along the way can be overcome to achieve smooth insertion of the lining. The special biting method of the thread will make the thread connection tighter and more reliable under the influence of the rear-end jacking force during the "pulling from the front and pushing from the back" process, and there will be no axial tensile disconnection;

[0015] Step S7: After the short lined pipe is jacked into place, its axis and the center axis of the pipeline to be repaired are kept within the preset error range. After pipe stabilization and positioning, a uniform gap of 3 - 5 cm is provided between the outer wall of the newly lined pipeline and the inner wall of the repaired old pipe, which is convenient for forming a circumferential void grouting pipe stabilization layer with a uniform thickness. The circumferential void between the inner and outer walls of the new and old pipelines is grouted by the layered grouting method, and the circumferential void grouting pipe stabilization layer uses high-strength quick-drying cement mortar grouting material;

[0016] Step S8: The pipeline bottom sludge and construction mud water dredged during the construction process are treated in-situ by a vehicle-mounted integrated dredging sludge treatment device, eliminating the need for sludge transportation and saving the consumption of dredging water sources. The vehicle-mounted integrated dredging sludge treatment device separates the mud and water, screens out gravel and large particle suspended solids for reuse as building materials, and the separated supernatant is reused as water for dredging and hydraulic cleaning. The treatment process is fully enclosed and has zero emissions, ensuring no greenhouse gas emission and resource recycling throughout the process.

[0017] In Step S1, the temporary water cut-off plugging is configured to set a plugging airbag integrated device at the outlet of the previous well chamber upstream of the upstream well chamber and at the outlet of the subsequent well chamber downstream of the downstream well chamber. Among them, the plugging airbag integrated device includes a vehicle-mounted oil-free screw air compressor, an air storage tank, an air inflation hose nylon rope, and a plugging airbag with a diversion hole for air supply. The vehicle-mounted oil-free screw air compressor is connected to the air storage tank to provide a compressed air source. The air storage tank supplies air to the plugging airbag through the air inflation hose nylon rope. After the airbag is inflated, it expands and tightly adheres to the inner wall of the pipeline to be repaired to achieve the water-stop and sealing effect. When the on-line pressure gauge on the air inflation hose nylon rope shows a working pressure of 1.0 MPa, the injection of compressed air is stopped. After the installation of the airbag temporary plugging is completed, the water can still flow through the diversion hole in the middle of the plugging airbag at the outlet of the previous well chamber upstream, and its water level will not be too high to increase; after the operator sets up the temporary drainage equipment, the diversion hole in the middle of the plugging airbag with a diversion hole is closed, and the operator returns to the ground from the well chamber.

[0018] Select plugging air bags of different specifications according to the inner diameter of the pipeline to be repaired; when the inner diameter of the pipeline < φ600mm, select air bags with a length of 800 - 1000mm and a diameter of 200 - 280mm in the deflated state; when φ600mm < inner diameter of the pipeline < φ1200mm, select air bags with a length of 1000 - 1700mm and a diameter of 280 - 480mm in the deflated state; when the inner diameter of the pipeline > φ1200mm, select air bags with a length of 1700 - 3200mm and a diameter of 480 - 1250mm in the deflated state.

[0019] During the process of repairing the pipeline, through the visualization platform of the vehicle-mounted control system, the whole process of pre-treatment, axial positioning control, jacking route, and completion quality monitoring is digitally controlled. All engineering materials during the construction period and acceptance stage form platform big data, which is uploaded to the urban public pipeline comprehensive information management platform, and this data record is reflected on the inlaid QR code on the inspection well cover of the repaired pipeline. The pipeline maintenance personnel can scan this QR code to know all the historical records of pipeline repair on-site, helping to build the digital foundation during the digital transformation stage of urban public pipeline operation and maintenance.

[0020] After step S1, it also includes: after completing the above temporary water cut-off measures, use the hydraulic flushing method or / and supplemented with cleaning agents to clean the pipeline to be repaired for trench dredging and hydraulic cleaning. The cleaning water can come from the outlet of the centrifugal submersible sewage pump, be pumped into the storage tank of the special high-pressure cleaning vehicle, and after being pressurized by the vehicle-mounted high-pressure water pump, only high-pressure water jet cleaning is carried out on the inner wall of the pipeline to be repaired through the trench lining rubber hose.

[0021] In step S3, when it is detected that the dislocation width or joint height difference on the inner wall of the pipeline > 3cm, combined with the ground penetrating radar technology of the road surface, further detection of cavity judgment is carried out on the soil layer under the road surface. If there are large cavities in the soil layer under the road surface, in order to prevent further settlement caused by the remaining soil cavities after the pipeline repair is completed, local compaction grouting reinforcement pretreatment should be carried out on the interface part. Depending on the inner diameter of the pipeline to be repaired, the dislocation width or joint height difference, ground grouting or in-pipe grouting methods are adopted. For the grouting pipe, interval staggered layered grouting is adopted during local grouting. The grouting pipe is lifted 50cm each time. During the grouting process, it is necessary to ensure that the grout can reach the position without leakage and overflow. After the grouting is completed, the grouting pipe is pulled out after the grout has initially set. At the same time, the interface gap part is blocked and repaired.

[0022] The scope of the local compaction grouting is 1m before and after the interface of the pipeline to be repaired, 1.5m on both sides, 0.5m above the pipe top, and 2m below the pipe bottom. The grouting liquid uses 42.5 grade cement, the addition ratio of fine fly ash is 50 - 70%, the addition ratio of water glass is 0.8 - 1.2%, and it is mixed into double-fast cement. The grouting pressure is 0.2 - 0.5MPa.

[0023] Regarding the inner diameter size, misalignment width or disconnection height difference of the pipeline to be repaired, ground grouting or in-pipe grouting methods are adopted, including:

[0024] ① When 3 cm < interface misalignment width or disconnection height difference < 1 / 2 pipeline wall thickness, that is, in the case of medium structural defects:

[0025] If the diameter of the pipeline to be repaired > 800 mm, the operator enters the pipe. At the defective interface, the in-pipe grouting local soil reinforcement method is adopted. Grout is injected from the pipe to the surrounding soil outside the pipe to form a waterproof curtain, filling and reinforcing the cavities in the surrounding soil. After the grouting is completed, the interface crack is locally repaired with polyurethane water-swelling foam adhesive. At the same time, the inner wall of the pipeline interface misalignment or disconnection part is leveled to facilitate the smooth insertion of the short lining pipe;

[0026] If the diameter of the pipeline to be repaired < 800 mm, at the defective interface position, the ground grouting local soil reinforcement method is adopted. The spacing of the ground grouting pipes can be controlled within 50 cm around the interface position; after the grouting is completed, the interface crack is locally repaired with in-situ resin-cured lining. The pipeline robot drags in a glass fiber cloth impregnated with unsaturated polyester resin + heat / light curing additives, and the airbag is pressurized and pasted. The resin is cured by hot steam or ultraviolet light irradiation to form a local smooth resin-cured lining layer. The curing width is not less than 400 m, and the curing thickness is 3 - 4 mm. The purpose is to repair the interface gap and the inner wall of the smooth defect and facilitate the smooth insertion of the short lining pipe.

[0027] ② When 1 / 2 pipeline wall thickness < interface misalignment width or disconnection height difference < pipeline wall thickness, that is, in the case of serious structural defects:

[0028] If the diameter of the pipeline to be repaired > 800 mm, the local soil reinforcement method: the operator enters the pipe. At the defective interface, the in-pipe grouting local soil reinforcement method is adopted. Grout is injected from the pipe to the surrounding soil outside the pipe to form a waterproof curtain, filling and reinforcing the cavities in the surrounding soil. After the grouting is completed, the interface crack is locally repaired with polyurethane water-swelling foam adhesive. At the same time, the inner wall of the pipeline interface misalignment or disconnection part is leveled to facilitate the smooth insertion of the short lining pipe; the local repair method for the interface crack part: when a glass fiber cloth impregnated with unsaturated polyester resin + heat / light curing additives is manually dragged in, the airbag is pressurized and pasted, and the resin is cured by hot steam or ultraviolet light irradiation. On the basis of the original polyurethane water-swelling foam adhesive crack filling, 1 - 2 layers of resin-cured lining layers are added to form a local enhanced lining;

[0029] When the diameter of the pipeline to be repaired is greater than 800mm, glass fiber cloth impregnated with unsaturated polyester resin + heat / light curing additives is manually dragged in, and the airbag is pressurized and pasted. The resin is cured by hot steam or ultraviolet light. On the basis of the original polyurethane water-swellable foam crack filling, 1 to 2 layers of resin-cured lining are added to form a local reinforced lining; when the diameter of the pipeline to be repaired is less than 800mm, a pipeline robot drags in glass fiber cloth impregnated with unsaturated polyester resin + heat / light curing additives, and the airbag is pressurized and pasted. The resin is cured by hot steam or ultraviolet light. On the basis of the original single-layer resin-cured lining, a single or double-layer resin-cured lining is added to form a local reinforced lining. The purpose is also to repair the interface gaps and the inner wall of the smooth defects, and to facilitate the smooth insertion of the short lining pipe.

[0030] The short lined pipe adopts two types of liner wall structures. When the inner wall space of the old defective pipeline has enough liner diameter margin, the conventional high-rib high-density polyethylene (HDPE) wrapped structure wall liner pipe is adopted; if there is not enough liner diameter margin, the inner and outer wall coated reinforced, thin-rib high-density polyethylene (HDPE) wrapped structure wall liner pipe is adopted, which does not occupy too much of the original pipeline inner wall diameter to maintain the original flow area.

[0031] On the other hand, the present invention also provides a system for implementing the above-mentioned trenchless repair method for the inner lining of a buried water supply and drainage pipe, comprising:

[0032] A temporary drainage device, comprising a centrifugal submersible sewage pump, an underwater cable and a temporary drainage pipe, wherein the centrifugal submersible sewage pump has a pump seat placed on the bottom plate of an upstream well chamber, the underwater cable is temporarily fixed to the side wall of the upstream well chamber through a hanger or an expansion bolt, the centrifugal submersible sewage pump is used to be electrically connected to a vehicle-mounted centralized control system and a visual operation digital platform through the underwater cable, one end of the temporary drainage pipe is fixedly connected to the outlet pipe clamp of the centrifugal submersible sewage pump, and the other end extends out of the upstream well chamber and is laid along the ground to a well chamber behind the downstream well chamber, and is discharged into the well chamber along the wellbore;

[0033] The robot with pipeline inspection CCTV system is equipped with wired cameras and searchlights. It moves inside the pipeline to be repaired and records the inner wall images and uploads them to the vehicle-mounted centralized control system and visual operation digital platform for storage and processing.

[0034] The integrated plugging airbag device includes a vehicle-mounted oil-free screw air compressor, a gas storage tank, an inflation hose nylon rope, and a plugging airbag with a diversion hole for air supply. The vehicle-mounted oil-free screw air compressor is connected to the gas storage tank to provide a compressed air source. The gas storage tank supplies air to the plugging airbag through the inflation hose nylon rope. The plugging airbag is used to be set on the inner wall of the pipeline to be repaired. When the airbag is inflated, it expands and tightly adheres to the inner wall of the pipeline to be repaired to achieve a water-stop and sealing effect. After the operator sets up the temporary drainage equipment, the diversion hole in the middle of the plugging airbag with a diversion hole is closed;

[0035] A laser measuring instrument for measuring the axial and radial runout is used to strictly control the horizontal and vertical displacement deviations of the lined pipeline and accurately control the axial trajectory of the pipeline;

[0036] The integrated vehicle-mounted dredging sludge treatment device installed in a container-type equipment vehicle includes a rubber-lined nylon pipe, a vehicle-mounted sludge suction vacuum pump, a suction pump outlet pipe, an equipment integrated water tank, a chain-driven multi-scraper coarse grille, a screw-type solid-liquid separator, a drum fine grille, a sewage discharge pump, a sewage outlet pipe, a cyclone grit chamber, and a sand-water separator. The inlet of the vehicle-mounted sludge suction vacuum pump sucks sludge in vacuum through the rubber-lined nylon pipe. The outlet of the vehicle-mounted sludge suction vacuum pump is connected to one end of the suction pump outlet pipe. The other end of the suction pump outlet pipe is located above the chain-driven multi-scraper coarse grille and is pressure-transported through the suction pump outlet pipe to the chain-driven multi-scraper coarse grille to conduct coarse screening on the sludge. The intercepted coarse-screened grid residues fall into the screw-type solid-liquid separator by gravity. The screw-type solid-liquid separator vibrates to intercept the coarse-screened grid residues. The sewage after the chain-driven multi-scraper coarse grille flows through the drum fine grille. The drum fine grille conducts fine filtration on the small organic fibers contained in the water. The filtered water after the drum fine grille is pressurized and lifted by the sewage discharge pump and discharged through the sewage outlet pipe. The sewage outlet pipe has at least two branch pipes. One-way filtered water flows into the equipment integrated water tank through the reuse water valve to use the recycled water resources; the other-way filtered water flows through the pipeline through the grit chamber outlet valve, the cyclone grit chamber, and the sand-water separator to conduct fine sand recovery on the outlet water.

[0037] Preferably, the inflation hose nylon rope is equipped with a pressure gauge, and the pressure gauge sends a pressure sensing signal to the vehicle-mounted centralized control device and the visual operation digital platform. When the pressure gauge shows that the compressed air pressure is less than the preset value, the vehicle-mounted centralized control device and the visual operation digital platform control the vehicle-mounted oil-free screw air compressor and the gas storage tank to replenish air to keep the pipeline plugging tight.

[0038] Preferably, the temporary drainage pipe is temporarily fixed in the well or on the ground by a pipe clamp or a pipe hoop.

[0039] Preferably, the laser measuring instrument for measuring the axial and radial runout is an Omega LSG-2030 laser diameter gauge for measuring the diameter width runout.

[0040] Preferably, the centrifugal submersible pump is provided with a float switch, and the float switch is configured to start the pump when the well chamber is at a high level and stop the pump when the well chamber is at a low level.

[0041] Preferably, it further includes a liquid level gauge arranged in the well chamber. The liquid level gauge is used to measure the change of the liquid level in the well chamber and feedback it to the vehicle-mounted centralized control device and the visual operation digital platform. The vehicle-mounted centralized control device and the visual operation digital platform are electrically connected to the centrifugal submersible pump to control the working frequency and rotation speed of the centrifugal submersible pump according to the liquid level.

[0042] Due to the adoption of the above technical solutions, the beneficial effects obtained by the present invention include:

[0043] (1) The inner lining short pipe preferably adopts high-density polyethylene (HDPE) material which is green, low-carbon, recyclable, and the type can be a wound structure wall or a solid wall short pipe. It adopts a quick-thread interface processed by special equipment. During the inner lining construction, the requirements for the construction site and environment are loose, and it can work with water and electric welding. There are no processes such as underground work, fusion welding, and rubber ring splicing, which greatly shortens the construction period and reduces the impact of water interruption during the repair period;

[0044] (2) The wall thickness of the quick-thread interface part is relatively thick, and its ring stiffness and ring flexibility are not less than those of the pipeline body. The two form an integral stress structure. The overall stiffness is large, the toughness is high, and the axial tensile resistance performance is good. It can independently bear the ground rigid load pressure and internal water pressure without relying on the old and defective pipelines on the periphery, achieving self-sustaining stress in the complete sense. As the jacking force increases, this thread interface becomes tighter and tighter, and there is no phenomenon of tensile loose sleeve. A 5mm water-swellable circumferential rubber ring is arranged on both end faces to assist in increasing the water stop sealing performance, and zero leakage can be achieved throughout the later operation period. The pipe diameter of the threaded connection part is completely straight and smooth with the short pipe body. It does not occupy the inner diameter of the old and defective pipeline and does not affect the flow rate after repair. Two inner lining pipe wall structure forms are adopted. When there is enough inner lining pipe diameter allowance in the inner wall space of the old and defective pipeline, high-density polyethylene (HDPE) wound structure wall inner lining pipes with conventional rib height are adopted; if there is not enough inner lining pipe diameter allowance, high-density polyethylene (HDPE) wound structure wall inner lining pipes with enhanced inner and outer wall coating and thin rib height are adopted, which do not occupy too much of the inner diameter of the original pipeline wall to maintain the original flow area;

[0045] (3) Different from the traditional jacking method of the inner lining short pipe, a construction method combining "pulling from the front and pushing from the back" is adopted. The rear jacking cylinder provides thrust, and the front winch soft rope provides traction force. Under the combined action of the two, the frictional resistance along the way is reduced and the dislocation obstacle at the interface part of the old and defective pipeline is overcome, realizing smooth insertion of the inner lining and accelerating the construction speed;

[0046] (4) By adopting the precise laser-guided axial measurement control technology, the elevation of the inner liner pipe section routing and the bottom slope of the pipeline are precisely controlled to ensure a smooth gravity flow state in the slope direction after repair. At the same time, a uniform gap of 3 - 5 cm between the outer wall of the new inner liner pipe and the inner wall of the repaired old pipe is reliably guaranteed, which is convenient for forming a stable pipe grouting layer with a uniform thickness for the inner liner pipe section and facilitating subsequent grouting operations;

[0047] (5) The pipe-stabilizing grouting method for the gap layer between the inner and outer pipe walls is improved. Multiple grouting observation holes are set at the end of jacking. By using the grouting observation through the observation holes and the layered perfusion method, the pipe-stabilizing grouting layer is maintained with sufficient thickness and reliable compactness, thereby ensuring the position stability of the inner liner pipe and the uniformity of the stress transfer surface, ensuring that it can independently bear internal and external stresses and better play its structural self-supporting role;

[0048] (6) The pipeline bottom mud and construction mud water dredged during the construction process can be transported to the centralized treatment and disposal site for dredged sludge, or the mud-water separation and treatment can be carried out on the construction site.

[0049] (7) During the repair process, the whole process of pre-treatment, axial positioning control, jacking routing, and completion quality monitoring is digitally controlled through the visualization platform of the vehicle-mounted control system. All engineering materials during the construction period and acceptance stage form platform big data, which is uploaded to the urban public pipeline comprehensive information management platform, and this data record is reflected on the QR code inlaid on the inspection well cover of the repaired pipeline. By scanning this QR code, the network maintenance personnel can know all the historical records of pipeline repair on-site, which helps the construction of the digital base during the digital transformation stage of urban public pipeline operation and maintenance. Description of the Drawings

[0050] Figure 1 It is the construction flow chart of an embodiment of the present invention.

[0051] Figure 2 It is the composition diagram of the vehicle-mounted integrated treatment device for dredged sludge in the embodiment of the present invention.

[0052] Figure 3 It is Figure 2 the structural schematic diagram of the vehicle-mounted integrated treatment device for dredged sludge shown.

[0053] Figure 4 It is Figure 2 the position diagram of the discharge port of the vehicle-mounted integrated treatment device for dredged sludge shown. Detailed Embodiment

[0054] The present invention belongs to the non-excavation integral structural repair technology for drainage pipelines. Specifically, it uses multiple plastic short pipes for interpenetrating lining to carry out non-excavation structural repair construction technology for the overall circumferential and longitudinal lengths of pipelines with structural damage.

[0055] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0056] The present invention is applicable to the overall structural repair of buried water supply and drainage pipelines with different materials within the range of 200 mm to 1000 mm in inner diameter of the pipeline. Taking a circular buried drainage pipeline made of steel-concrete material, socket and spigot joint, rubber ring seal, and having relatively large structural defects that require overall structural repair as an example, the repair method is described as follows:

[0057] (1) Composition and function description of each part of the old and defective pipeline to be repaired, inspection well structures along the line route, temporary plugging and temporary drainage equipment before repair, threaded interface lining short pipe assembly, and supporting devices / equipment

[0058] (a) Old and defective pipeline to be repaired and inspection well structures along the line route

[0059] Please refer to Figure 1 , the pipeline (1.5) that needs overall structural repair is located between the upstream inspection well and starting well (1) and the downstream inspection well and receiving well (3), and the pipeline length (L) is generally between 30 and 200 m. Before implementing structural repair, prior discrimination should be carried out through conventional preventive detection and evaluation means. The pipeline (1.5) is an old and defective pipeline, and the defect level belongs to the category of overall structural repair. One inspection well (2) is found upstream of the upstream inspection well and starting well (1) through line inspection, and one inspection well and receiving well (4) is found downstream of the downstream inspection well. Temporary water cut-off plugging is carried out on these two inspection wells to facilitate the repair operation of the old and defective pipeline (1.5) to be repaired. The inspection wells (1) to (4) can be brick structures, steel-concrete structures or plastic integrated structures. The compositions and accessory facilities of the above four inspection wells (1 to 4) are respectively: well chambers (1.1, 2.1, 3.1, 4.1), well shafts (1.2, 2.2, 3.2, 4.2), manhole covers (1.3, 2.3, 3.3, 4.3), fiberglass ladders inside the inspection wells (1.4, 2.4, 3.4, 4.4), and 1.0 t mobile hand-pulled chain hoists (1.6) required for daily maintenance of the inspection wells. It should be noted that the above different inspection wells have the same composition structure: well chamber, well shaft, manhole cover, fiberglass ladder inside the inspection well, but they are different components.

[0060] The well chamber (1.1, 2.1, 3.1, 4.1) can be circular or rectangular. For inspection wells of pipelines with a diameter of less than φ400 mm, the diameter of the circular well or the single side dimension of the square well is not less than 1200 m; for inspection wells of pipelines with a diameter of more than φ400 mm and less than φ600 mm, the diameter of the circular well or the single side dimension of the square well is not less than 1200 m; for inspection wells of pipelines with a diameter of more than φ600 mm and less than φ1000 mm, the diameter of the circular well or the single side dimension of the square well is not less than 1500 m. The well shaft (1.2, 2.2, 3.2, 4.2) is circular or rectangular, and the circular diameter or the single side dimension of the square is not less than 1000 m.

[0061] (b) Pre-repair temporary sealing and temporary drainage equipment

[0062] Please refer to Figure 1 , the pre-repair temporary sealing facility includes an upstream plugging airbag integrated device (2.6) installed at the water outlet of the inspection well (2) and the position of the outlet pipeline (2.5), and a downstream plugging airbag integrated device (4.6) installed at the water inlet of the inspection well (4) and the position of the inlet pipeline (3.5). The upstream plugging airbag integrated device (2.6) consists of a remotely controlled plugging airbag with a diversion hole (2.6.1), an inflatable hose nylon rope with a three-way valve (inflation, air supply, deflation) and a pressure gauge (2.6.2), a vehicle-mounted oil-free screw air compressor and air storage tank (2.6.3), a comprehensive equipment vehicle (2.6.4), a vehicle-mounted centralized control device and a visual operation digital platform (2.7.3), etc. The comprehensive equipment vehicle (2.6.4) is equipped with a diesel generator set and also loads equipment such as a vehicle-mounted oil-free screw air compressor and air storage tank (2.6.3), a vehicle-mounted centralized control device and a visual operation digital platform (2.7.3), and a hydraulic station (6.7). The distribution box is integrally installed in the vehicle-mounted centralized control device and visual operation digital platform (2.7.3) to supply power to the electromechanical equipment, instruments, automatic control equipment, on-site lighting fixtures, etc. required for the repair. The downstream plugging airbag integrated device (4.6) has the same specifications and composition as the upstream plugging airbag integrated device (2.6), and consists of a remotely controlled plugging airbag with a diversion hole (4.6.1), an inflatable hose nylon rope with an electromagnetic three-way valve (inflation, air supply, deflation) and an on-line pressure gauge (4.6.2), etc. The vehicle-mounted oil-free screw air compressor and air storage tank (2.6.3), the comprehensive equipment vehicle (2.6.4), and the centralized control device and visual operation digital platform (2.7.3) are shared by the two.

[0063] The remotely controlled plugging airbag with a diversion hole (2.6.1) and (4.6.1) has a three-layer structure. The inner layer is composed of low-vulcanized natural rubber with a relatively large tensile strength. The middle layer is a metal warp reinforcement layer. The outer layer is a high-vulcanized, structurally dense, wear-resistant and anti-slip high-vulcanized natural rubber sealing layer. It can be folded and placed at 90°, and the working pressure > 1.0 MPa. Depending on the inner diameter of the old and defective pipeline to be plugged, different specifications of plugging airbags are selected. The plugging airbag with a diversion hole can be the Xingchen W43466 plugging airbag. When the inner diameter of the pipeline < φ600 mm, an airbag with a length of 800 - 1000 mm and a diameter of 200 - 280 mm in the deflated state is selected; when φ600 mm < inner diameter of the pipeline < φ1200 mm, an airbag with a length of 1000 - 1700 mm and a diameter of 280 - 480 mm in the deflated state is selected; when the inner diameter of the pipeline > φ1200 mm, an airbag with a length of 1700 - 3200 mm and a diameter of 480 - 1250 mm in the deflated state is selected. The vehicle-mounted oil-free screw air compressor and air storage tank (2.6.3) provide a compressed air source, and supply air to the plugging airbag (2.6.1) and the plugging airbag (2.6.1) respectively through the inflatable hose nylon rope (2.6.2) and the inflatable hose nylon rope (4.6.2). After the airbag is inflated, it expands and tightly adheres to the inner wall of the pipeline to be repaired, achieving a water-stop and sealing effect. The nominal diameter of the inflatable hose nylon rope (2.6.2) and the inflatable hose nylon rope (4.6.2) is 25 - 50 mm, the tensile force is not less than 1 t, and the length depends on the well depth and is in the range of 9 - 20 m. In addition to providing compressed air, the inflatable hose nylon rope (2.6.2) and the inflatable hose nylon rope (4.6.2) can also pull the airbag to the ground after the airbag deflates during plugging, acting as a towing rope. During the plugging process, if air leakage occurs and the airbag pressure decreases, the on-line pressure gauges on the inflatable hose nylon rope (2.6.2) and the inflatable hose nylon rope (4.6.2) will transmit the pressure drop signal to the centralized control device and visual operation digital platform (2.7.3). The device issues an instruction to automatically start the vehicle-mounted oil-free screw air compressor and air storage tank (2.6.3) for air replenishment, and automatically stops after replenishing to the rated pressure of 1.0 MPa.

[0064] After the downstream outlet of the inspection well (2) is blocked, a temporary drainage device (2.7) is installed in the well. The facility consists of a centrifugal submersible sewage pump (2.7.1), an underwater cable (2.7.2), a temporary drainage pipe (2.7.4), etc. The centrifugal submersible sewage pump (2.7.1) increases the water flow rate of the water inlet pipe (2.5.1) in the well chamber (2.1). After the upstream water inlet of the inspection well (4) is blocked, it is driven into the well chamber of the inspection well (4) through the temporary drainage pipe (2.7.4) and then to the downstream pipeline through the outlet pipe (4.5). During the pipeline repair period, the upstream water can be guaranteed to flow normally. The power of the centrifugal submersible sewage pump (2.7.1) comes from the diesel generator set of the integrated equipment vehicle (2.6.4), and is powered by the distribution box of the centralized control device and visual operation digital platform (2.7.3). The water pump adopts a wide channel, anti-blocking, low specific speed, speed regulation and frequency conversion type, and is made of stainless steel. The water pump is equipped with a float switch. According to the amount of water coming from the water inlet pipe (2.5.1) of the inspection well (2), the centrifugal submersible sewage pump (2.7.1) is automatically started and stopped through the float switch. The centralized control device and the visual operation digital platform (2.7.3) optimizes the working frequency and speed of the centrifugal submersible sewage pump (2.7.1) through machine learning to ensure smooth water discharge and save operating power consumption. The pump is configured with appropriate flow and head according to the diameter of the water inlet pipe (2.5.1) and the normal operating water volume statistics. The usual configuration is as follows:

[0065] Inlet pipe (2.5.1) diameter: φ200mm, equipped with Q=30~40m3 / hr, H=10~12m, P=3.0kw mobile variable speed submersible sewage pump

[0066] Inlet pipe (2.5.1) diameter: φ300mm, equipped with Q=40~100m3 / hr, H=10~12m, P=4.0kw mobile variable speed submersible sewage pump

[0067] Inlet pipe (2.5.1) diameter: φ400mm, equipped with Q=100~250m3 / hr, H=10~12m, P=11kw mobile variable speed submersible sewage pump

[0068] Inlet pipe (2.5.1) diameter: φ500mm, equipped with Q=250~450m3 / hr, H=10~12m, P=15kw mobile variable speed submersible sewage pump

[0069] Inlet pipe (2.5.1) diameter: φ600mm, equipped with Q=450~600m3 / hr, H=10~12m, P=22kw mobile variable speed submersible sewage pump

[0070] If the diameter of the water inlet pipe (2.5.1) exceeds φ600mm, or the power of the centrifugal submersible sewage pump (2.7.1) exceeds 22kw, additional temporary drainage pump installation points shall be set at multiple inspection well positions upstream of the inspection well (2) to disperse the single-point pumping pressure. The underwater cable (2.7.2) is matched with the centrifugal submersible sewage pump (2.7.1), with a length of 10 - 20m, and is in the form of an armored waterproof sleeve. The temporary drainage pipe (2.7.4) is selected according to the outlet diameter of the centrifugal submersible sewage pump (2.7.1), with a suitable diameter and material selected. When the diameter of the temporary drainage pipe (2.7.4) is less than 200mm, a rubber-lined braided nylon hose material is selected; when the diameter is greater than 200mm, a steel pipe with a clamp joint is selected, and the wall thickness > 3mm.

[0071] (c) Threaded interface lined short pipe assembly

[0072] Please refer to Figure 1 , the lined short pipe (5.1) preferably uses high-density polyethylene (HDPE) material that is green, low-carbon, recyclable, and the type can be a wound structure wall or a solid wall short pipe, with a nominal pipe diameter in the range of 200 - 1200mm. Taking the high-density polyethylene (HDPE) wound structure wall short pipe assembly (5) as an example, the equipment components include the lined short pipe body (5.1), the pipe head cross brace (5.2) installed at the front of the first short pipe, the pipe tail cross brace (5.3) installed at the inner wall of the inlet of the receiving well (3), the grouting pipe stabilizing layer (5.4) between the inner wall of the pipeline (1.5) that needs to be structurally repaired as a whole and the outer wall of the lined short pipe body (5.1), the grouting observation hole (5.5) on the water inlet side of the receiving well (3), the container truck (5.6) loading the lined short pipe body (5.1), etc.

[0073] The length of the lined short pipe body (5.1) depends on the space size of the shaft chamber (1.1) of the launching well (1) and can be in the range of 200 - 1000mm. The type is a high-density polyethylene (HDPE) wound structure wall pipe, with both ends being flat joint threaded internal screw sockets and flat joint threaded external screw sockets respectively, and the ring stiffness ≥ 8000N / m2. It is formed by secondary processing after cutting the qualified finished pipeline in the market. In the plastic pipeline production workshop, the finished pipeline is cut into fixed-length short pipes in the range of 200 - 1000mm, and two methods are used to form the threaded interfaces at both ends. One method is to send the fixed-length finished short pipe after cutting offline into an injection molding machine, which has molds with internal screw sockets and external screw sockets. The linear low-density polyethylene (LLDPE) hot melt resin particles form threaded interfaces at both ends in the mold and are welded to the two ends of the fixed-length short pipe sent into the machine to form threaded interfaces at both ends. Another method is to use the high-density polyethylene (HDPE) material of the lined short pipe body (5.1) to extrude and form a fixed-length solid wall small short pipe. The flat joint threaded internal screw socket and the flat joint threaded external screw socket are respectively machined on a lathe, and then the two threaded ends are welded to the fixed-length finished short pipe offline to form threaded interfaces at both ends.

[0074] Two types of inner lining short pipe wall structures are adopted. When there is enough inner diameter allowance in the inner wall space of the old and defective pipeline, a conventional high-rib high-density polyethylene (HDPE) wound structured-wall inner lining pipe is used; if there is not enough inner diameter allowance, an inner and outer wall coated and reinforced, thin-rib high-density polyethylene (HDPE) wound structured-wall inner lining pipe is used, which does not occupy too much of the inner diameter of the original pipeline to maintain the original flow area.

[0075] Specifications of the conventional high-rib high-density polyethylene (HDPE) wound structured-wall inner lining pipe:

[0076] It is a short pipe with a ring stiffness of not less than 8000 N / m2, and the height of the screw threads at both ends is about 1 / 3 of the thickness of the wound structured-wall pipe. Under this condition, for a wound structured-wall pipe with a nominal diameter of 200 mm, the wall thickness is not less than 11 mm, and the height of the screw threads is not less than 3.7 mm; for a wound structured-wall pipe with a nominal diameter of 300 mm, the wall thickness is not less than 17 mm, and the height of the screw threads is not less than 5.7 mm; for a wound structured-wall pipe with a nominal diameter of 400 mm, the wall thickness is not less than 22 mm, and the height of the screw threads is not less than 7.3 mm; for a wound structured-wall pipe with a nominal diameter of 600 mm, the wall thickness is not less than 32 mm, and the height of the screw threads is not less than 10.7 mm; for a wound structured-wall pipe with a nominal diameter of 800 mm, the wall thickness is not less than 47 mm, and the height of the screw threads is not less than 15.7 mm; for a wound structured-wall pipe with a nominal diameter of 1000 mm, the wall thickness is not less than 60 mm, and the height of the screw threads is not less than 20.0 mm; for a wound structured-wall pipe with a nominal diameter of 1200 mm, the wall thickness is not less than 66 mm, and the height of the screw threads is not less than 22 mm. The pitch of the screw threads and the tapered size of the threads depend on the pipe diameter.

[0077] Specifications of the inner and outer wall coated and reinforced, thin-rib high-density polyethylene (HDPE) wound structured-wall inner lining pipe:

[0078] It is a short pipe with a ring stiffness of not less than 12,000 N / m2, and the height of the screw threads at both ends is about 1 / 3 of the thickness of the winding structure wall pipe. Under this condition, for a thin-ribbed winding structure wall pipe with a nominal diameter of 200 mm, the wall thickness is not less than 8 mm, and the height of the screw threads is not less than 2.7 mm; for a thin-ribbed winding structure wall pipe with a nominal diameter of 300 mm, the wall thickness is not less than 13 mm, and the height of the screw threads is not less than 4.4 mm; for a thin-ribbed winding structure wall pipe with a nominal diameter of 400 mm, the wall thickness is not less than 17 mm, and the height of the screw threads is not less than 5.8 mm; for a thin-ribbed winding structure wall pipe with a nominal diameter of 600 mm, the wall thickness is not less than 25 mm, and the height of the screw threads is not less than 8.4 mm; for a thin-ribbed winding structure wall pipe with a nominal diameter of 800 mm, the wall thickness is not less than 36 mm, and the height of the screw threads is not less than 12 mm; for a thin-ribbed winding structure wall pipe with a nominal diameter of 1000 mm, the wall thickness is not less than 41 mm, and the height of the screw threads is not less than 13.8 mm; for a thin-ribbed winding structure wall pipe with a nominal diameter of 1200 mm, the wall thickness is not less than 48 mm, and the height of the screw threads is not less than 16 mm. The pitch of the screw threads and the taper size of the threads depend on the pipe diameter.

[0079] The pipe head cross brace (5.3) installed at the front of the first section of the inner lining short pipe (5.1) is composed of 4 retractable and limited stainless steel pipe brackets (5.3.1), 1 toughened glass light target disc (5.3.2), 4 support rubber pads at the ends of the brackets (5.3.3), etc. The stainless steel pipe brackets (5.3.1) are fixed to the inner wall of the inner lining short pipe (5.1) at one end through the rubber pads (5.3.3) and support the toughened glass light target disc (5.3.2) at the other end. The center of the first section of the inner lining short pipe (5.1) and the center of the toughened glass light target disc (5.3.2) are adjusted to be centered with each other. The pipe head cross brace (5.3) moves towards the receiving well (3) as the subsequent inner lining short pipes are jacked in sequence.

[0080] The composition of the pipe tail cross brace (5.2) is similar to that of the pipe head cross brace (5.3), and it is also composed of retractable and limited stainless steel pipe brackets (5.2.1), toughened glass light target disc (5.2.2), support rubber pads at the ends of the brackets (5.2.3), etc. The material of the toughened glass light target disc (5.2.2) at the pipe tail is different from that of the toughened glass light target disc (5.2.2) at the pipe head, and its type is an enlarged prism.

[0081] The circumferential void grouting pipe stabilizing layer (5.4) uses high-strength quick-drying cement mortar grouting material. It is made with high-strength cement as the main cementitious material, adding a fluidization accelerator (sodium carboxymethyl cellulose) and other functional materials.

[0082] The grouting observation holes (5.5) are set at the circumferential void between the new and old pipes at the end of the pipeline in the receiving well (3). Looking at this circumferential void from the front view angle, 4 stainless steel short pipes with a diameter of 10 - 15 mm are set as the observation holes, which are respectively placed at 0 o'clock, 3 o'clock, 6 o'clock, and 9 o'clock.

[0083] The container truck (5.6) transports the lining short pipe body (5.1) required for construction.

[0084] (d) Supporting devices / equipment

[0085] Please refer to Figures 1-4 , the supporting devices / equipment include the hydraulic jacking equipment (6) installed in the launching shaft (1), the soft rope traction and pulling-in device (7) in the receiving shaft (3), the laser-guided axial measurement and control device (8) in the launching shaft (1), and the vehicle-mounted integrated sewage treatment device (9).

[0086] The hydraulic jacking equipment (6) consists of a rear backplate steel plate (6.1), a hydraulic cylinder (6.2), an annular or horseshoe-shaped plywood top plate (6.3), the guiding and supporting steel rails (6.4) required to support the jacking of the lining short pipe (5.1), the steel rail supporting square sleepers (6.5), the oil pipe (6.6), and the vehicle-mounted hydraulic station (6.7). The hydraulic jacking equipment (6) provides the jacking thrust for the lining short pipe, which is mainly completed by the hydraulic cylinder (6.2). After the temporary water cut-off in the launching shaft (1), a rear backplate steel plate (6.1) with a thickness of 5 - 15 cm made of Q235B carbon steel or SS316 stainless steel is set on the water inlet side in the shaft. The fixed end of the hydraulic cylinder (6.2) is locked on the rear backplate steel plate (6.1) through a steel bracket, and its thrust end is provided with 3 or 4 thrust oil rods, which act on the outer threaded socket pipe wall of the flat joint of the lining short pipe (5.1) through the annular or horseshoe-shaped plywood top plate (6.3) with a thickness of 2 - 5 cm. The inner and outer diameters of the annular or horseshoe-shaped plywood top plate (6.3) match and fit tightly with the outer diameter, inner diameter, and thread height of the outer threaded socket of the lining short pipe (5.1). Two guiding and supporting steel rails (6.4) are set below the lining short pipe (5.1) to be jacked, and the height of the steel rails is 10 - 20 cm, providing jacking support force and axial guidance. Several steel rail supporting square sleepers (6.5) are set below it.

[0087] The soft rope traction and pulling-in device (7) includes a vehicle-mounted electric winch (7.1), a nylon wide belt traction rope (7.2), a lower guiding and tensioning guiding shaft (7.3) installed in the receiving shaft (3), an upper guiding and tensioning guiding shaft (7.4) installed on the ground, a diesel-powered tool vehicle (7.5) loaded with the electric winch (7.1), etc.

[0088] The laser-guided axial measurement and control device (8) consists of a laser theodolite (8.1), a four-corner adjustable horizontal support steel plate (8.2) set on the bottom plate of the launching shaft (1), a launching shaft leveling staff (8.3), a receiving shaft leveling staff (8.4), etc. The laser-guided axial measurement and control device (8) can also be a laser measuring instrument for measuring axial and radial runout, such as the Omega LSG-2030 laser diameter gauge for measuring diameter width runout.

[0089] An in-vehicle integrated treatment device for dredged sludge (9) is adopted to separate, treat and dispose of the dredged sludge at the bottom of pipeline and construction mud water dredged during the construction process on the construction site. The in-vehicle integrated treatment device for dredged sludge (9) includes a container-type equipment vehicle (9.1), a rubber-lined nylon pipe for sucking dredged sludge (9.2), an in-vehicle sludge suction vacuum pump (9.3), a water outlet pipe of the suction pump (9.4), an equipment integrated water tank (9.5), a chain-driven multi-scraper coarse grille (9.6) arranged in the water tank, a screw-type solid-liquid separator (9.7), a drum fine grille (9.8), a sewage discharge pump (9.9), a sewage outlet pipe (9.10), a cyclone grit chamber (9.11), a sand-water separator (9.12), etc.

[0090] The vehicle-mounted sludge suction vacuum pump (9.3) installed on the containerized equipment vehicle (9.1) sucks the dredged sludge in a vacuum through the rubber-lined nylon pipe (9.2) and injects it into the stainless-steel equipment integrated water tank (9.5) under pressure through the water outlet pipe (9.4) of the suction pump. First, it flows through the 100-mm-gap stainless-steel grid bar chain-driven multi-scraper coarse grille (9.6) installed on the upper part to conduct a coarse screening of the sludge. The intercepted coarse-screened grid residues fall by gravity into the subsequent screw-type solid-liquid separator (9.7), and the sewage after the grille enters the equipment integrated water tank (9.5). The intercepted coarse-screened grid residues are vibrated and screened in the screw-type solid-liquid separator (9.7). The selected large-particle lightweight fiber-like organic matters are transported to the outer wall of the containerized equipment vehicle (9.1) through the shaftless screw conveyor (9.7.2). There is a coarse-screened grid residue discharge port (9.7.3) on the outer wall, and the initially screened large-particle lightweight fiber-like organic matter grid residues are transported to the sanitary landfill of the landfill site. The filtered sewage after screening also enters the equipment integrated water tank (9.5) through the post-filtration pipe (9.7.1). The mixed sewage in the equipment integrated water tank (9.5) flows through the drum fine grille (9.8) with an inner inflow gap of 5 mm to conduct a fine filtration of the fine organic fibers contained in the water. The post-filtration grid residues are transported to the outer wall of the equipment vehicle (9.1) through the shaftless screw conveyor (9.8.1). There is a fine-filtration grid residue discharge port (9.8.2) on the outer wall, and the fine organic fiber fine-filtration grid residues are also transported to the sanitary landfill of the landfill site. The water after filtration by the drum fine grille (9.8) is pressurized and lifted by the sewage discharge pump (9.9) and discharged through the sewage outlet pipe (9.10). The sewage outlet pipe (9.10) is divided into three paths. One path of the filtered water is reused through the reclaimed water valve (9.10.1) to conduct dredging and hydraulic cleaning of the pipeline to be repaired (1.5) or discharged to the urban sewage collection network; one path of the filtered water passes through the grit chamber effluent valve (9.10.2) and passes through the hydrocyclone grit chamber (9.11) to recover fine sand from the effluent; one path of the filtered effluent passes through the in-vehicle reclaimed water valve (9.10.3) to backwash the screening equipment such as the stainless-steel grid bar chain-driven multi-scraper coarse grille (9.6), the vehicle-mounted screw-type solid-liquid separator (9.7), and the drum fine grille (9.8). The hydrocyclone grit chamber (9.11) conducts sand-water separation on the incoming water through the high-speed centrifugal separator (9.11.1) at the top. The separated supernatant water flows into the equipment integrated water tank (9.5) through the outlet pipe (9.11.2). The separated sand and gravel are transported by the sand-water separator (9.12), and the dehydrated sand and gravel are transported to the outer wall of the equipment vehicle (9.1) through the shaftless screw conveyor (9.12.1). There is a sand and gravel discharge port (9.12.2) on the outer wall, and the sand and gravel are reused as building materials.

[0091] The whole set of devices operates in a closed manner, properly ensuring the safety and reliability of on-site bottom sludge treatment and disposal. At the same time, it conducts resource utilization of the bottom sludge and prevents the escape of greenhouse gases such as methane contained in the bottom sludge, achieving pollution reduction and carbon emission reduction throughout the process. During the treatment process, plant extract deodorants can be sprayed to eliminate local odor spills.

[0092] (2) Implementation process of the repair method

[0093] (a) Pretreatment - Temporary water cut-off measures before and after the pipeline to be repaired

[0094] Please refer to Figure 1 , before the overall structural repair of the pipeline (1.5), it is necessary to conduct a wired closed-circuit television inspection (CCTV) on it through temporary water cut-off to judge the types and grades of its defects, so as to determine whether structural repair is required. After determining to carry out structural repair, before implementing the repair construction, it is also necessary to conduct temporary water cut-off on it to create construction conditions. The temporary water cut-off measures include temporary airbag plugging, temporary water drainage by pump and temporary discharge of the pipeline.

[0095] At the position of 1 inspection well (2) in front of the upstream inspection well and launching shaft (1), open the manhole cover (2.3). According to the maintenance requirements of urban drainage pipelines, prepare for safe operation in the limited underground space for the wellbore (2.2) and the well chamber (2.1). After the safety ventilation, lighting detection and discrimination operations are safe, the operator wears diving equipment and a breathing mask and enters the well chamber (2.1) along the fiberglass ladder (2.4), while dragging in the plugging airbag (2.6.1) and the inflatable hose nylon rope (2.6.2). Place the plugging airbag (2.6.1) with a diversion hole at the nozzle position of the outlet pipe (2.5), and temporarily fix the inflatable hose nylon rope (2.6.2) on the well wall through a hanging piece or an expansion bolt. Connect the inflatable hose nylon rope (2.6.2) on the ground to the vehicle-mounted oil-free screw air compressor and air storage tank (2.6.3), and connect it to the plugging airbag (2.6.1) with a diversion hole underground. Similarly, conduct temporary airbag plugging for the downstream inspection well (4) of the receiving well (2). It consists of a plugging airbag (4.6.1) with a diversion hole and an inflatable hose nylon rope (4.6.2). The installation and connection methods are the same as those of the upstream inspection well (2), and the operation method is the same as above. 2 sets of plugging airbags share 1 set of vehicle-mounted oil-free screw air compressor and air storage tank (2.6.3). The ground routing of the inflatable hose nylon rope (4.6.2) is relatively long, and it is fixed on the ground with temporary pipe clamps. Through the vehicle-mounted centralized control device and the visual operation digital platform (2.7.3), start the vehicle-mounted oil-free screw air compressor and air storage tank (2.6.3), and inject compressed air into the plugging airbag (2.6.1) and the plugging airbag (4.6.1). After the airbag expands, the wear-resistant and anti-slip natural rubber sealing layer on the outer wall tightly adheres to the inner wall of the original pipeline. When the in-line pressure gauges on the inflatable hose nylon rope (2.6.2) and the inflatable hose nylon rope (4.6.2) show a working pressure of 1.0 MPa, stop injecting compressed air. After the installation of the temporary airbag plugging is completed, the inspection well (2) can still pass water through the diversion hole in the middle of the plugging airbag (2.6.1), and it is discharged normally through the outlet pipe (2.5) of the inspection well (2), the upstream inspection well and launching shaft (1), the pipeline (1.5) that needs overall structural repair, the downstream inspection well and receiving well (3), the outlet pipe of the receiving well (3) and the inlet pipe (3.5) of the inspection well (4), and the inspection well (4). The water level in the well chamber (2.1) will not be too high and increase.

[0096] The centrifugal submersible sewage pump (2.7.1), underwater cable (2.7.2) and temporary drainage pipe (2.7.4) are placed from the ground. The centrifugal submersible sewage pump (2.7.1) is placed on the bottom plate of the well chamber (2.1) by the pump seat provided by the equipment, and the underwater cable (2.7.2) is temporarily fixed to the well wall by hanging parts or expansion bolts. One end of the underwater cable (2.7.2) is connected to the centrifugal submersible sewage pump (2.7.1), and the other end is connected to the vehicle-mounted centralized control device and visual operation digital platform (2.7.3). One end of the temporary drainage pipe (2.7.4) is fixedly connected to the outlet of the centrifugal submersible sewage pump (2.7.1), and the other end is laid along the ground to the wellhead of the inspection well (4) behind the downstream inspection well and receiving well (2), and then goes down along the wellbore (4.2) and discharged into the well chamber (4.1). When the temporary drainage pipe (2.7.4) is less than 200mm in diameter, a rubber-lined braided mesh nylon hose material is selected, and the pipe clamps in the well and on the ground are temporarily fixed; when the diameter is greater than 200mm, a clamp interface steel pipe material is selected, and the pipe wall thickness is greater than 3mm. The pipe clamp is fixed to the well wall, and the ground route is fixed with a pipe clamp. The above steps are for temporary drainage of the water pump and temporary drainage of the pipeline.

[0097] After the operator has checked the above steps and found them to be correct, he will seal the diversion holes between the plugging airbag with diversion holes (2.6.1) and the plugging airbag (4.6.1), and return the water from the well chamber (2.1) and the well chamber (4.1) to the ground. The vehicle-mounted centralized control device and visual operation digital platform (2.7.3) will start the centrifugal submersible sewage pump (2.7.1) to temporarily lift the water from the upstream pipeline (2.5.1) of the inspection well (2), surpassing the starting well (1) and the receiving well (2), and directly flowing into the inspection well (4).

[0098] During this period, the inflatable hose nylon rope (2.6.2) and the inflatable hose nylon rope (4.6.2) are equipped with online pressure gauges. If the compressed air pressure is displayed to be less than 1.0MPa, the pressure sensor signal is sent to the vehicle-mounted centralized control device and the visual operation digital platform (2.7.3). The vehicle-mounted centralized control device and the visual operation digital platform can be a server, especially automatically starting the vehicle-mounted oil-free screw air compressor and the air storage cabinet (2.6.3) to replenish air to keep the pipeline tightly sealed. The centrifugal submersible sewage pump (2.7.1) is equipped with a float switch. According to the amount of water coming from the water inlet pipe (2.5.1) of the inspection well (2), the centrifugal submersible sewage pump (2.7.1) is automatically started and stopped through the float switch setting of the high-position pump start and low-position pump stop.

[0099] The temporary drainage equipment also includes a liquid level gauge installed in the well chamber. The liquid level gauge is used to measure the change of the liquid level in the well chamber and feedback it to the vehicle-mounted centralized control device and the visual operation digital platform. The vehicle-mounted centralized control device and the visual operation digital platform are signal-connected to the centrifugal submersible pump to control the working frequency and rotation speed of the centrifugal submersible pump according to the liquid level. The centralized control device and the visual operation digital platform (2.7.3) also optimize the working frequency and rotation speed of the centrifugal submersible pump (2.7.1) through machine learning method, so as to save the electricity consumption of the temporary pump operation during construction on the premise of ensuring the safe and smooth temporary drainage of the incoming water.

[0100] (b) Pretreatment - Dredging and hydraulic cleaning of the pipeline to be repaired

[0101] After the above temporary water cut-off measures are completed, the pipeline to be repaired (1.5) is dredged and hydraulically cleaned by the hydraulic cleaning method. The cleaning water can come from the outlet of the centrifugal submersible pump (2.7.1), be pumped into the storage tank of the special high-pressure cleaning vehicle, and after being pressurized by the vehicle-mounted high-pressure water pump, the inner wall of the pipeline to be repaired (1.5) is only cleaned by high-pressure water jet through a rubber-lined hose for pipeline dredging. Cleaning agents can be supplemented if necessary. After dredging and cleaning, there are no sediments, garbage and other obstacles in the original pipeline, there is no accumulated water affecting the construction in the pipeline, the inner surface of the pipeline is clean, without attachments, sharp burrs and protrusions.

[0102] The sewage generated by cleaning is also sucked into the vehicle-mounted integrated pipeline dredging and sludge treatment device (9) for centralized treatment. During cleaning, damage and destruction of the pipeline caused by high-pressure water jet should be avoided.

[0103] (c) Pretreatment - Structural defect detection of the pipeline to be repaired by closed-circuit television (CCTV)

[0104] After the above temporary water cut-off measures are completed, on the premise of ensuring the dry pipe of the pipeline to be repaired (1.5), it is detected by closed-circuit television (CCTV). A wired camera and a searchlight are mounted on the pipeline robot to form a pipeline detection closed-circuit television device, which travels in the pipeline to be repaired and records the inner wall images, mainly for identifying and recording structural defect parts such as rupture, deformation, dislocation, disconnection, leakage, and corrosion. Two methods are used for detection:

[0105] Method 1: Manual image recognition. The pipeline robot transmits the recorded images of the inner wall of the pipeline during the travel route to the centralized control device and the visual operation digital platform (2.7.3), and the operator manually calibrates the defect location (mileage stake number) and identifies the defect type and quantity;

[0106] Method 2: Intelligent image recognition. The centralized control device and digital platform for visual operation (2.7.3) uploads the image of the pipeline robot, uses the defect library accumulated in the platform's large database to intelligently identify the defect, determine the defect type, and mark the location and quantity of the defect; it should be noted that the image intelligent recognition technology is an existing technology.

[0107] Focus on measuring the size of the straight line deformation and the interface dislocation position, especially the interface dislocation width or the dislocation height difference > 3cm. For pipes with a diameter of ≥ 800mm, operators can enter the pipe to measure the inner diameter of the deformation and interface dislocation reduction position; for pipes with a diameter of < 800mm, CCTV image size recognition measurement is used. The purpose is to reasonably determine the outer wall diameter of the lining pipe and the interface dislocation treatment method in the next step.

[0108] After completing the above two methods of structural defect detection, the type, quantity and level of defects shall be determined in accordance with the "Technical Regulations for Inspection and Evaluation of Urban Drainage Pipelines" to determine whether overall structural repair is required.

[0109] (d) Pretreatment: Pretreatment of the inner wall of the pipeline to be repaired, reinforcement of the surrounding soil, and treatment of interface dislocation and disjointed gaps

[0110] If the interface misalignment, disconnection and leakage points are detected on the inner wall of the pipeline, especially when the misalignment width or disconnection height difference is greater than 3cm, there will be a risk of groundwater infiltration into the pipe around the soil of the pipeline, causing soil cavitation, which will in turn cause road collapse. At this time, the road bottom penetrating radar technology (GPR) can be combined to further detect the cavitation of the lower layer of the road surface. If there is a large soil cavity under the road surface, in order to prevent the residual soil cavity from further causing settlement after the pipeline repair is completed, the interface should be pre-treated with local compaction grouting reinforcement. Depending on the inner diameter of the pipeline to be repaired, the misalignment width or the height difference of the disconnection, ground grouting or in-pipe grouting is used. The compaction grouting range is 1m before and after the interface of the pipeline to be repaired, 1.5m on both sides, 0.5m above the top of the pipe, and 2m below the bottom of the pipe. The grouting liquid uses 42.5 grade cement, the addition ratio of fine fly ash is 50-70%, and the addition ratio of water glass is 0.8-1.2%, which is made into double-fast cement. The grouting pressure is 0.2~0.5MPa. Grouting pipe. When grouting locally, staggered and layered grouting is used. The grouting pipe is lifted 50cm each time. During the grouting process, it is necessary to ensure that the slurry can reach the right place without leakage and overflow. After the grouting is completed, the grouting pipe is pulled out after the slurry has initially solidified, and the grouting hole is sealed in time to ensure that the grouting hole does not leak. At the same time, the gaps in the interface are blocked and repaired. The specific treatment methods are divided into the following two situations:

[0111] ①3cm<interface misalignment width or disconnection height difference<1 / 2 pipe wall thickness, i.e. medium structural defect

[0112] When the diameter of the pipeline to be repaired is > 800 mm, the operator enters the pipe. At the defective joint part, the local soil reinforcement method of grouting inside the pipe is adopted. Grout is injected from the inside of the pipe to the surrounding outside to form a waterproof curtain to fill and reinforce the cavities in the surrounding soil. After the grouting is completed, the crack part of the joint is locally repaired by using polyurethane water-swelling foaming glue to fill the cracks. At the same time, the inner wall of the misaligned or disjointed part of the pipeline joint is leveled to facilitate the smooth insertion of the short liner pipe. When the diameter of the pipeline to be repaired is < 800 mm, at the mileage stake number of the defective joint, the local soil reinforcement method of ground grouting is adopted. The spacing of the ground grouting pipes can be controlled within 50 cm around the joint position. After the grouting is completed, the part with interface cracks is locally repaired by using in-situ resin cured lining. The pipeline robot drags in a glass fiber cloth impregnated with unsaturated polyester resin + heat / light curing additives, and is pasted under airbag pressure. The resin is cured by heat steam or ultraviolet light irradiation to form a locally smooth resin cured lining layer. The curing width is ≥ 400 m, and the curing thickness is 3 - 4 mm. The purpose is to repair the interface gap and the inner wall of the defective part smoothly and facilitate the smooth insertion of the short liner pipe.

[0113] ② 1 / 2 pipeline wall thickness < interface misalignment width or disjoint height difference < 1.0 pipeline wall thickness, namely the case of serious structural defects

[0114] The local soil reinforcement method is the same as that in case ①. For the local repair method of the interface crack part, on the basis of case ①, 1 - 2 layers of resin cured lining are added to the defective part of the interface to form a reinforced lining. When the diameter of the pipeline to be repaired is > 800 mm, a glass fiber cloth impregnated with unsaturated polyester resin + heat / light curing additives is manually dragged in, pasted under airbag pressure, and the resin is cured by heat steam or ultraviolet light irradiation. On the basis of the original polyurethane water-swelling foaming glue crack filling, 1 - 2 layers of resin cured lining (single layer thickness is 3 - 4 mm, double layer thickness is 6 - 8 mm) are added to form a local reinforced lining; when the diameter of the pipeline to be repaired is < 800 mm, the pipeline robot drags in a glass fiber cloth impregnated with unsaturated polyester resin + heat / light curing additives, pasted under airbag pressure, and the resin is cured by heat steam or ultraviolet light irradiation. On the basis of the original single-layer resin cured lining, a single layer or double layer of resin cured lining (single layer thickness is 3 - 4 mm, double layer thickness is 6 - 8 mm) is added to form a local reinforced lining. The purpose is also to repair the interface gap and the inner wall of the defective part smoothly and facilitate the smooth insertion of the short liner pipe.

[0115] (e) Connection of the short liner pipe in the well

[0116] After the pretreatment process is completed, the inner lining short pipe body (5.1) is suspended from the container transport truck (5.6) into the upstream inspection well and launching well (1) by a mobile 1.0t hand-pulled suspension chain hoist (1.6). Depending on the operation space size of the well chamber (1.1), the diameter of the inner lining short pipe (5.1) ranges from 200 to 1200 mm, and the single root length ranges from 200 to 1000 mm. The inner diameter of the pipeline to be repaired should preferably range from 200 to 1200 mm. After the interface misalignment and disconnection gap treatment process is completed, according to the retest results of the wired closed-circuit television inspection (CCTV), find the part with the smallest inner diameter of the pipeline to be repaired, and match the inner lining short pipe (5.1) by reducing 3 cm according to this smallest inner diameter. If the diameter reduction of the part with the smallest inner diameter is less than 10% of the original pipeline inner diameter, use a conventional high rib high-density polyethylene (HDPE) wound structured wall inner lining pipe with a ring stiffness of not less than 8000 N / m2; if the diameter reduction of the part with the smallest inner diameter is greater than 10% of the original pipeline inner diameter, use an inner and outer wall coated and reinforced, thin rib high-density polyethylene (HDPE) wound structured wall inner lining pipe with a ring stiffness of not less than 12000 N / m2.

[0117] In the well chamber (1.1), the inner lining short pipes (5.1) are quickly connected in a threaded manner in the direction of the upstream external thread socket and the downstream internal thread socket, and are sent into the inner wall of the pipeline to be repaired. The threaded part can be lubricated with a detergent solution without phosphate to facilitate tightening. A pipe head cross brace (5.3) is installed at the front of the first pipe section at the start, and a pipe tail cross brace (5.2) is installed at the tail of the last pipe section at the end. The pipe head cross brace (5.2) travels all the way to the receiving well (3) as the jacking process progresses. After the pipe tail cross brace (5.2) is jacked into this section of the pipe, it is immediately disassembled and reinstalled at the tail of the next pipe section. This disassembly process is rotated as the pipe sections are continuously jacked in.

[0118] To facilitate the insertion and process guidance inside the pipe, high-density polyethylene (HDPE) guide rails with a height of 1 to 2 cm can be welded on-site at the bottom of the inner lining short pipe (5.1). The guide rails are distributed at intervals along the length of the pipeline. After the single root or multiple inner lining short pipes (5.1) are quickly connected in a threaded manner, in addition to installing the pipe tail cross brace (5.3), a 2 to 5 cm thick annular or horseshoe-shaped plywood roof plate (6.3) is placed at the external thread socket at the tail of the last inner lining short pipe (5.1). Three or four thrust oil rods act on the plywood roof plate (6.3) at the thrust end of the hydraulic cylinder (6.2), and the inner lining short pipes (5.1) connected quickly in a threaded manner are pushed into the pipeline to be repaired along the guide rails at the bottom of the pipe.

[0119] (f) Jacking the rear end and pulling the front end of the inner lining short pipe (pushing from the front and pulling from the back)

[0120] During the process of pushing in multiple connected liner short pipes (5.1), in order to better adjust the trajectory posture and reduce the pushing force, a nylon wide band traction rope (7.2) is connected to the center of the pipe head cross brace (5.2) installed at the front of the first section of the first pipe, forming a "pull in front and push in back" mode to reduce the friction resistance of pushing in. The nylon wide band traction rope (7.2) is provided with pulling force by the ground electric winch (7.1), and the axial force is transmitted through the lower guide tension guide shaft (7.3) and the upper guide tension guide shaft (7.4). The nylon wide band traction rope (7.2) is always kept in a tensioned state, and the tension force is adjusted by the guide shafts (7.4) and (7.4). The pulling speed provided by the ground electric winch (7.1) is consistent with the pushing speed of the hydraulic cylinder in the well acting on (6.2), and is uniformly controlled by the vehicle-mounted centralized control device and visual operation digital platform (2.7.3).

[0121] (g) Laser guided axial measurement control

[0122] The absolute elevation is introduced to the bottom plate of the well chamber (1.1) through the ground elevation device, and the absolute elevation of the bottom plate is measured. The absolute elevation of the original pipeline center at the entrance of the well chamber (1.1) is measured by a steel tape measure through the starting well tower scale (8.3). Similarly, the absolute elevation of the original pipeline center at the exit of the well chamber (3.1) is measured through the receiving well tower scale (8.4). The connecting line of these two points is the center axis of the pipeline to be repaired (1.5). The laser theodolite (8.1) emits a laser axis that is consistent with the center axis of the pipeline to be repaired (1.5), and projects it from near to far onto the tempered glass optical target disk (5.2.2) at the end of the pipe and the tempered glass optical target disk (5.3.2) at the head of the pipe, and forms a light spot. The distance between the light spot and the cross center of the target disk (horizontally and vertically) is the axial deviation of the jacking. During the jacking process of each section of the pipe, the jacking is measured and corrected as it is measured. The deviation between the jacking axis and the static laser axis is constantly checked by dynamic measurement. The horizontal and vertical offset between the cross center of the optical target plate and the laser spot is tracked, and the image is magnified through the prism structure of the optical target plate tempered glass, so that the operator can clearly observe the deviation. If there is a deviation, the rear hydraulic cylinder acts on (6.2) and the front nylon wide band traction rope (7.2), and they cooperate with each other to correct and calibrate. Ensure that the central axial error between the liner short pipe (5.1) and the pipe to be repaired (1.5) is within ±2mm.

[0123] (h) How to deal with process obstruction

[0124] If there is a large dislocation or disconnection during the process, and the height difference is greater than 5cm, the jacking will be blocked. The front nylon wide band traction rope (7.2) is used to raise or lower the pipe section to stagger the height. When the pipeline to be repaired (1.5) is ≥800mm, retract one section of the lining pipe, and the operator enters the pipe to lubricate the blocked part with a phosphate-free washing liquid to facilitate continued jacking.

[0125] (i) Grouting of the circumferential gap between the inner and outer walls after short positioning of the inner liner pipe

[0126] After the short inner liner pipe (5.1) is jacked in place, its axis and the center axis of the pipeline to be repaired (1.5) are kept within a reasonable error range. After pipe stabilization and positioning, a uniform gap of 3 - 5 cm can be ensured between the outer wall of the new inner liner pipe and the inner wall of the old pipe to be repaired, facilitating the formation of a circumferential void grouting pipe stabilization layer (5.4) with a uniform thickness.

[0127] The circumferential gap between the new and old pipelines is grouted using a layered grouting method. The circumferential void grouting pipe stabilization layer (5.4) uses a high-strength quick-drying cement mortar grouting material. It is made with high-strength cement as the main binder, adding a fluidization accelerator (sodium carboxymethyl cellulose) and other functional materials to form a quick-drying and quick-hardening grouting material. This grouting material has good fluidity, can flow quickly within the grouting layer (5.4) without creating grouting dead angles. It has a fast drying and hardening speed and excellent physical and mechanical properties. It has good compressive and flexural properties, ensuring the stable position of the long inner liner pipe formed after the connection of the short inner liner pipe (5.1) without deviation, and can fully withstand the upper ground load and the complete deformation of the original pipeline foundation at the lower part without uneven settlement. The main performance indicators are as follows:

[0128] Compressive strength (MPa): ≥20 after 1 day of drying; ≥40 after 3 days of drying; ≥60 after 28 days of drying;

[0129] Flexural strength (MPa): ≥3 after 1 day of drying; ≥5 after 3 days of drying; ≥10 after 28 days of drying;

[0130] Vertical expansion rate (%): 3hr = 0.1 - 3.5; Expansion value deviation between 24hr and 3hr = 0.02 - 0.5

[0131] The grouting observation holes (5.5) are arranged at the circumferential void between the new and old pipelines at the end of the pipeline on the outlet side of the receiving well chamber (3.1). Looking at this circumferential void from the front view, 4 stainless steel short pipes with a diameter of 10 - 15 mm are set as observation holes, which are respectively placed at 0 o'clock, 3 o'clock, 6 o'clock, and 9 o'clock. The stainless steel short pipes of the grouting observation holes (5.5) are closed and fixed with annular steel plates, and the annular steel plates are lapped and fixed on the inner wall of the chamber (3.1).

[0132] On the entrance side of the launching shaft chamber (1.1), the circumferential gap between the pipeline to be repaired (1.5) and the lining short pipe (5.1) is sealed with a circular steel plate, and several grouting holes are opened on this steel plate. Open the 4 observation holes in the receiving shaft chamber (3.1), and pump high-strength quick-drying cement mortar grouting material into the grouting holes of the launching shaft chamber (1.1) with a mud pump, and the grouting pressure shall not exceed 0.2 MPa. When slurry emerges from the observation hole at the 6 o'clock direction, it can be verified that the routing of the circumferential void grouting pipe-stabilizing layer (5.4) is smooth and the exhaust is unobstructed, then close this hole; continue grouting. When slurry emerges from the observation holes at the 3 o'clock and 9 o'clock directions, stop grouting and close these two holes, and wait for the slurry to precipitate and solidify in the gap for about 30 min to 1.0 hr to reduce the buoyancy on the lining pipe and drain the previously grouted water; continue grouting. When slurry emerges from the observation hole at the 0 o'clock direction at the top, stop grouting and close this hole, and wait for the slurry to finally solidify.

[0133] If the diameter of the pipeline to be repaired (1.5) is > 1000 mm, grouting can also be carried out by opening holes at the inner top of the lining short pipe (5.1), with a hole spacing of about 2 m, and injecting grout hole by hole.

[0134] (j) Treatment of the front and rear ports of the repaired pipeline

[0135] After the circumferential void grouting is completed, remove the circular closing steel plates set on the entrance side of the launching shaft chamber (1.1) and the exit side of the receiving shaft chamber (3.1), and fill the gap with two-component polysulfide sealant, and embed and seal it firmly.

[0136] (k) Detection of water seepage in the lined pipeline and closed water test

[0137] After the repair is completed, conduct a quality inspection of the inner wall of the lined pipeline by wired closed-circuit television detection (CCTV) to observe whether there are water seepage parts.

[0138] The closed water test of the lined pipeline is carried out by the water replenishment method, and the test procedure shall be implemented in accordance with the provisions of the current national standard "Code for Construction and Acceptance of Water Supply and Drainage Pipeline Engineering". The water seepage volume (L / 24hr.m) within 24 hours per unit running meter shall not be greater than 0.0046D (D is the inner diameter of the lined pipeline).

[0139] (L) Selection of green and low-carbon repair materials, treatment and disposal of "three wastes" (drainage sludge), and pollution reduction and carbon reduction measures (resource recovery and utilization)

[0140] The lining short pipe shall preferably be made of green, low-carbon and recyclable high-density polyethylene (HDPE) material, and the type can be a wound structural wall or a solid wall short pipe.

[0141] (m) Digital management means and big data formation during the repair process

[0142] During the repair process, the whole process digital control of the pre-treatment, axis positioning control, jacking route, and completion quality monitoring is realized through the on-vehicle centralized control device and visual operation digital platform (2.7.3). During the construction period and the acceptance stage, all engineering materials form platform big data, which is uploaded to the urban public pipeline comprehensive information management platform, and this data record is reflected on the QR code inlaid on the inspection well cover of the repaired pipeline. The information reflected by the information QR code is as follows:

[0143] Facility name: Overall structural repair of drainage pipeline Facility number:

[0144] Sewerage system (separate / confluent): Affiliated drainage device:

[0145] Transport medium (sewage / rainwater / confluent): Ground elevation: Well depth (m):

[0146] Original pipeline attributes:

[0147] Pipe diameter: Pipe material: Pipe center elevation:

[0148] Inner lining pipeline attributes:

[0149] Pipe diameter: Pipe material: Pipe center elevation:

[0150] Repair method: Repair time: Repair process: Treatment and disposal of three wastes during the process:

[0151] Project completion time / Construction unit / Design unit / Construction unit / Management and maintenance unit::

[0152] Daily maintenance record: Time and photo record of daily maintenance photos: Others:

[0153] By scanning this QR code, the network maintenance personnel can check all the historical records of pipeline repair on-site.

[0154] Due to the adoption of the above construction method, its beneficial effects include:

[0155] (1) The inner lining short pipe preferably uses high-density polyethylene (HDPE) material that is green, low-carbon, and recyclable. The type can be a wound structural wall or a solid wall short pipe. A fast thread interface processed by special equipment is adopted. During the inner lining construction, the construction site and environment have loose requirements, and it can operate with water, without underground electric welding, fusion welding, rubber ring splicing and other processes, greatly shortening the construction period and reducing the impact of water interruption during the repair;

[0156] (2) The wall thickness of the quick-thread interface part is relatively thick, and its ring stiffness and ring flexibility are not less than those of the pipe body. The two form an integral stress-bearing structure. It has a large overall stiffness, high toughness, and good axial tensile resistance, and can independently bear the ground rigid load pressure and internal water pressure without relying on the old and defective pipes on the periphery, achieving self-sustaining stress in a complete sense. As the jacking force increases, this thread interface becomes tighter and tighter during jacking, and there is no phenomenon of tensile loose sleeve. There is a 5-mm water-swellable circumferential rubber ring on both end faces to assist in increasing the water-stop sealing performance, and zero leakage can be achieved throughout the later operation period. The pipe diameter of the threaded connection part is completely straight and smooth with the short pipe body. It does not occupy the inner diameter of the old and defective pipes and does not affect the flow rate after repair. Two types of inner lining pipe wall structures are adopted. When there is enough inner lining pipe diameter allowance in the inner wall space of the old and defective pipes, high-density polyethylene (HDPE) wound structured wall inner lining pipes with a conventional rib height are used; if there is not enough inner lining pipe diameter allowance, high-density polyethylene (HDPE) wound structured wall inner lining pipes with enhanced inner and outer wall cladding and a thin rib height are used, which do not occupy too much of the inner diameter of the original pipe wall to maintain the original flow area;

[0157] (3) Different from the traditional jacking method of the inner lining short pipe, the construction method of "pulling in the front and pushing in the back" is adopted. The rear jacking cylinder provides thrust, and the front winch soft rope provides traction force. Under the combined action of the two, the frictional resistance along the way is reduced and the offset obstacle at the interface part of the old and defective pipes is overcome, realizing smooth insertion of the inner lining and accelerating the construction speed;

[0158] (4) The precise laser-guided axial measurement control technology is adopted to accurately control the elevation of the inner lining pipe section routing and the pipe bottom slope, ensuring that the smooth slope gravity flow state is maintained after repair. At the same time, it reliably guarantees a uniform gap of 3 - 5 cm between the outer wall of the newly lined pipe and the inner wall of the repaired old pipe, facilitating the formation of a stable pipe grouting layer with a uniform thickness for the inner lining pipe section and facilitating subsequent grouting operations;

[0159] (5) The pipe-stabilizing grouting method for the gap layer between the inner and outer pipe walls is improved. Multiple grouting observation holes are set at the end of jacking. The grouting observation through the observation holes and the layered perfusion method are adopted to maintain a sufficient thickness and reliable compactness of the pipe-stabilizing grouting layer, thereby ensuring the position stability of the inner lining pipe and the uniformity of the stress transfer surface, ensuring that it can independently bear the internal and external stresses and better play its structural self-sustaining role;

[0160] (6) The pipe bottom mud and construction slurry water dredged during the construction process can be transported to the centralized treatment and disposal site for dredged sludge, or the mud-water separation and treatment can be carried out on the construction site.

[0161] (7) During the repair process, the vehicle-mounted control device visualization platform realizes full digital control over the pre-treatment, axial positioning control, jacking routing, and completion quality monitoring in the early stage. All engineering materials during the construction period and acceptance stage form platform big data, which is uploaded to the urban public pipeline comprehensive information management platform, and this data record is reflected on the inlaid two-dimensional code of the inspection well cover of the repaired pipeline. The network maintenance personnel can scan this two-dimensional code to know all the historical records of pipeline repair on-site, which helps the construction of the digital foundation in the digital transformation stage of the urban public pipeline network operation and maintenance.

[0162] The above relevant descriptions and the description of the embodiments are for the convenience of those of ordinary skill in the art to understand and apply the present invention. It is obvious that those skilled in the art can easily make various modifications to these contents and apply the general principles described herein to other embodiments without creative labor. Therefore, the present invention is not limited to the above relevant descriptions and the description of the embodiments, and the improvements and modifications made by those skilled in the art according to the disclosure of the present invention without departing from the scope of the present invention should be within the protection scope of the present invention.

Claims

1. A trenchless repair method for lining buried water supply and drainage pipelines, which repairs the drainage pipeline located between two well chambers. Among them, The two well chambers are divided into an upstream well chamber and a downstream well chamber according to the fluid flow direction, and it is characterized in that it includes: Step S1: Temporarily cut off the water and block the water outlet pipeline of the well chamber in front of the upstream well chamber and the water inlet pipeline of the well chamber behind the downstream well chamber. Guide the sludge water in the well chamber in front of the upstream well chamber to the rear end of the well chamber behind the downstream well chamber through temporary drainage equipment to ensure the normal flow of upstream water during the pipeline repair. Step S2: After completing the temporary water cut-off measure, on the premise of ensuring the main pipe of the drainage pipeline to be repaired, use a pipeline robot to conduct a wired closed-circuit television inspection of the drainage pipeline. A line camera and a searchlight fixture that make up the pipeline inspection closed-circuit television system are mounted on the pipeline robot. Travel in the pipeline to be repaired and record the inner wall images, and identify and record the structural defect parts such as cracks, deformations, displacements, disconnections, leaks, and corrosion detected. Step S3: Pretreat the defects such as interface displacement, disconnection, and leakage points detected on the inner wall of the pipeline. Step S4: Judge the types, quantities, and grades of defects in the entire pipeline to be repaired, and determine whether overall structural repair is required. Step S5: If it is determined that structural repair is required, when setting a lining tubular structure in the pipeline to be repaired, the lining tubular structure enters the pipeline to be repaired in the form of several lining short pipes. The two ends of the lining short pipe are respectively provided with internal threads and external threads. The front and rear lining short pipes are quickly screwed together through threads and are assisted by a water-swellable ring rubber seal to increase the water-stop sealing performance. The wall thickness at the thread interface position is relatively thick, and the ring stiffness and ring flexibility of the lining short pipe are not less than those of the pipeline body to be repaired. Step S6: During the construction process, adopt the whole-process laser-guided axis measurement and control technology to strictly control the horizontal and vertical displacement deviations of the lining pipeline, accurately control the pipeline axial trajectory to control the routing elevation and pipeline bottom slope of the lining pipeline, and the insertion method of the lining short pipe adopts the "pulling from the front and pushing from the back" method. The rear jack cylinder provides thrust, and the front winch soft rope provides traction. Step S7: After the lining short pipe is jacked in place, the axis of the lining short pipe and the center axis of the pipeline to be repaired are kept within the preset error range. After pipe stabilization and positioning, there is a uniform gap of 3-5 cm between the outer wall of the new lining pipeline and the inner wall of the repaired old pipe, forming a circumferential void grouting pipe stabilization layer with a uniform thickness. Adopt a layered grouting method to grout the circumferential gap between the inner and outer walls of the new and old pipelines. The circumferential void grouting pipe stabilization layer uses a high-strength quick-drying cement mortar grouting material. Step S8: During the construction process, the pipeline bottom mud and construction mud water dredged are treated in-situ by a vehicle-mounted integrated device for treating sludge and sewage, eliminating the need for sludge transportation and saving the consumption of sewage for trench cleaning. The vehicle-mounted integrated device for treating sludge and sewage separates the mud and water in the pipeline, screens out gravel and large particle suspended solids for reuse as building materials, and recycles the separated supernatant for trench cleaning and hydraulic cleaning.

2. The trenchless repair method for lining buried water supply and drainage pipelines according to claim 1, Characterized in that, In step S1, the temporary water cut-off plugging is configured to set a plugging airbag integrated device at the outlet of the previous well chamber of the upstream well chamber and the outlet of the subsequent well chamber of the downstream well chamber. Among them, the plugging airbag integrated device includes a vehicle-mounted oil-free screw air compressor, a gas storage tank, an inflation hose nylon rope, and a plugging airbag with a diversion hole. The vehicle-mounted oil-free screw air compressor is connected to the gas storage tank to provide compressed air. The gas storage tank supplies air to the plugging airbag through the inflation hose nylon rope. After the airbag is inflated, it expands and tightly adheres to the inner wall of the pipeline to be repaired to achieve a water stop and sealing effect. When the online pressure gauge on the inflation hose nylon rope shows the preset working pressure, the injection of compressed air is stopped. After the temporary installation of the airbag plugging is completed, the water can still pass through the diversion hole in the middle of the plugging airbag at the outlet of the previous well chamber of the upstream well chamber, and the water level of the previous well chamber of the upstream well chamber will not increase too high. After the operator sets up the temporary drainage equipment, the diversion hole in the middle of the plugging airbag with a diversion hole is closed, and the operator returns to the ground from the well chamber.

3. The trenchless repair method for lining buried water supply and drainage pipelines according to claim 2, characterized in that, plugging airbags of different specifications are selected according to the inner diameter size of the pipeline to be repaired; When the pipeline inner diameter < φ600mm, select an airbag with a deflated state length of 800 - 1000mm and a diameter of 200 - 280mm; When φ600mm < pipeline inner diameter < φ1200mm, select an airbag with a deflated state length of 1000 - 1700mm and a diameter of 280 - 480mm; When the pipeline inner diameter > φ1200mm, select an airbag with a deflated state length of 1700 - 3200mm and a diameter of 480 - 1250mm.

4. The trenchless repair method for lining buried water supply and drainage pipelines according to claim 1, characterized in that, During the process of repairing the pipeline, through the visualization platform of the vehicle-mounted control system, the whole process of pre-treatment, axial positioning control, jacking route, and completion quality monitoring is digitally controlled. All engineering materials during the construction period and acceptance stage form platform big data, which is uploaded to the urban public pipeline comprehensive information management platform, and the data records are reflected on the inlaid QR code on the inspection well cover of the repaired pipeline. The pipeline maintenance personnel can scan this QR code to know all the historical records of the pipeline repair on-site.

5. The trenchless repair method for lining buried water supply and drainage pipelines according to claim 1, characterized in that, After step S1, it further includes: after completing the temporary water cut-off measures, the pipeline to be repaired is dredged and hydraulically cleaned by using the hydraulic cleaning method supplemented with a cleaning agent. The cleaning water comes from the outlet of the centrifugal submersible sewage pump. The pump sends the water to the storage tank of the special high-pressure cleaning vehicle. After being pressurized by the vehicle-mounted high-pressure water pump, only high-pressure water jet cleaning is carried out on the inner wall of the pipeline to be repaired through the rubber hose.

6. The trenchless repair method for lining buried water supply and drainage pipelines according to claim 1, characterized in that, In step S3, when the misalignment width or disconnection height difference on the inner wall of the pipeline is detected to be > 3 cm, combined with the pavement ground penetrating radar technology, further detection and judgment of cavities in the lower layer of the road pavement soil are carried out. If there are large soil cavities under the road surface, in order to prevent the remaining soil cavities from further causing settlement after the pipeline repair is completed, local compaction grouting reinforcement pretreatment is carried out on the interface part. Depending on the inner diameter of the pipeline to be repaired, the misalignment width or disconnection height difference, ground grouting or in-pipe grouting methods are adopted. When carrying out local grouting, interval staggered layered grouting is used, the grouting pipe is lifted 50 cm each time, and after the grouting is completed, the grouting pipe is pulled out after the slurry begins to set. At the same time, the interface gap part is blocked and repaired.

7. The trenchless repair method for the internal lining of buried water supply and drainage pipelines according to claim 6, characterized in that the scope of the local compaction grouting is 1 m in front of and behind the interface of the pipeline to be repaired, 1.5 m on both sides, 0.5 m above the pipe top, and 2 m below the pipe bottom. The grouting liquid uses 42.5 grade cement, the addition ratio of fine fly ash is 50 - 70%, and the addition ratio of water glass is 0.8 - 1.2%, which is mixed into double-fast cement, and the grouting pressure is 0.2 - 0.5 MPa.

8. The trenchless repair method for the internal lining of buried water supply and drainage pipelines according to claim 6, characterized in that the adoption of ground grouting or in-pipe grouting methods depending on the inner diameter of the pipeline to be repaired, the misalignment width or disconnection height difference, includes: ① When 3 cm < the misalignment width or disconnection height difference of the interface < 1 / 2 of the pipeline wall thickness, that is, in the case of medium structural defects: If the inner diameter of the pipeline to be repaired > 800 mm, the operator enters the pipe, and at the defective interface part, the in-pipe grouting local soil reinforcement method is adopted, and grouting is carried out from the inside of the pipe to the surrounding outside to form a waterproof curtain, and the cavities in the surrounding soil are filled and reinforced. After the grouting is completed, the interface crack part is locally repaired by using polyurethane water-swelling foaming glue for crack filling. At the same time, the inner wall of the misaligned or disconnected part of the pipeline interface is leveled to facilitate the smooth insertion of the short lining pipe; If the inner diameter of the pipeline to be repaired < 800 mm, at the defective interface position, the ground grouting local soil reinforcement method is adopted, and the spacing arrangement of the ground grouting pipes can be controlled within 50 cm around the interface position; after the grouting is completed, the interface crack part is locally repaired by using in-situ resin cured lining. The pipeline robot drags in a glass fiber cloth impregnated with unsaturated polyester resin and heat / light curing additives, and the airbag is pressurized and pasted, and the resin is cured by hot steam or ultraviolet light irradiation to form a local smooth resin cured lining layer, and the cured thickness is 3 - 4 mm; ② When 1 / 2 of the pipeline wall thickness < the misalignment width or disconnection height difference of the interface < the pipeline wall thickness, that is, in the case of serious structural defects: If the diameter of the pipeline to be repaired is greater than 800mm, the local soil reinforcement method is as follows: the operator enters the pipe and adopts the method of grouting inside the pipe to reinforce the local soil at the defective interface. Grouting is injected from the inside of the pipe to the outside of the pipe to form a waterproof curtain to fill and reinforce the holes in the surrounding soil. After the grouting is completed, the interface cracks are partially repaired by using polyurethane water-swellable foam to fill the cracks. At the same time, the inner wall of the dislocated or disconnected part of the pipeline interface is leveled to facilitate the smooth insertion of the lining short pipe; Local repair method for interface cracks: When glass fiber cloth impregnated with unsaturated polyester resin and heat / light curing additives is manually dragged in, the air bag is pressurized and pasted, and the resin is cured by hot steam or ultraviolet light. 1~2 layers of resin-cured lining are added to form a locally reinforced lining.

9. The trenchless repair method for the lining of buried water supply and drainage pipes according to claim 1, It is characterized in that The short lined pipe adopts two types of liner wall structures. When the inner wall space of the old defective pipeline has enough liner diameter margin, the conventional high-rib high-density polyethylene (HDPE) wrapped structure wall liner pipe is adopted; when there is not enough liner diameter margin, the inner and outer wall coated reinforced, thin-rib high-density polyethylene (HDPE) wrapped structure wall liner pipe is adopted, which does not occupy too much of the original pipeline inner wall diameter to maintain the original flow area.

10. A system for implementing the trenchless repair method for the lining of buried water supply and drainage pipes according to any one of claims 1 to 9, It is characterized in that include: Temporary drainage equipment, including a centrifugal submersible sewage pump, an underwater cable, a temporary drainage pipe, and a vehicle-mounted centralized control system and a visualized operation digital platform. The centrifugal submersible sewage pump has a pump seat placed on the bottom plate of the upstream well chamber, and the underwater cable is temporarily fixed to the side wall of the upstream well chamber through a hanger or an expansion bolt. The centrifugal submersible sewage pump is used to be electrically connected to the vehicle-mounted centralized control system and a visualized operation digital platform through the underwater cable. One end of the temporary drainage pipe is connected to the outlet of the centrifugal submersible sewage pump, and the other end extends out of the upstream well chamber and is laid along the ground to the well chamber behind the downstream well chamber, and is discharged into the well chamber along the wellbore; The robot with pipeline inspection CCTV system is equipped with wired cameras and searchlights. It moves inside the pipeline to be repaired and records the inner wall images and uploads them to the vehicle-mounted centralized control system and visual operation digital platform for storage and processing. The plugging airbag integrated device comprises a vehicle-mounted oil-free screw air compressor, an air storage tank, an air-filling hose nylon rope and a plugging airbag with a diversion hole. The vehicle-mounted oil-free screw air compressor is connected to the air storage tank to provide compressed air. The air storage tank supplies air to the plugging airbag through the air-filling hose nylon rope. The plugging airbag is used to be set on the inner wall of the pipeline to be repaired. When the airbag is inflated, it expands and tightly adheres to the inner wall of the pipeline to be repaired to achieve a water-stopping sealing effect. After the operator sets up the temporary drainage equipment, the diversion hole in the middle of the plugging airbag with the diversion hole is closed; Laser measuring instrument for measuring axial and radial runout, which is used to strictly control the horizontal and vertical displacement deviation of the lined pipe and accurately control the axial trajectory of the pipe; A vehicle-mounted integrated treatment device for dredging sludge, which is installed on a containerized equipment vehicle. The vehicle-mounted integrated treatment device for dredging sludge includes a rubber-lined nylon pipe, a vehicle-mounted sludge suction vacuum pump, a suction pump outlet pipe, an equipment integrated water tank, a chain-driven multi-scraper coarse grille, a screw-type solid-liquid separator, a drum fine grille, a sewage discharge pump, a sewage outlet pipe, a cyclone grit chamber, and a sand-water separator. The inlet of the vehicle-mounted sludge suction vacuum pump sucks sludge in vacuum through the rubber-lined nylon pipe. The outlet of the vehicle-mounted sludge suction vacuum pump is connected to one end of the suction pump outlet pipe. The other end of the suction pump outlet pipe is located above the chain-driven multi-scraper coarse grille and conveys the sludge to the chain-driven multi-scraper coarse grille under pressure for coarse screening. The intercepted coarse screening grid residues fall into the screw-type solid-liquid separator by gravity. The screw-type solid-liquid separator vibrates to intercept the coarse screening grid residues. The sewage flowing through the chain-driven multi-scraper coarse grille flows to the drum fine grille. The drum fine grille finely filters the fine organic fibers contained in the water. The water filtered by the drum fine grille is discharged through the sewage outlet pipe after being pressurized and lifted by the sewage discharge pump. The sewage outlet pipe has at least two branch pipes. One way of the filtered water flows into the equipment integrated water tank through the reuse water valve to use the recycled water resources. The other way of the filtered water flows through the pipe, the grit chamber outlet valve, the cyclone grit chamber, and the sand-water separator to recover the fine sand in the effluent.

11. The trenchless rehabilitation system for lining buried water supply and drainage pipelines according to claim 10, characterized in that the inflatable hose nylon rope is equipped with a pressure gauge, and the pressure gauge sends a pressure sensing signal to the vehicle-mounted centralized control device and the visual operation digital platform. When the pressure gauge shows that the compressed air pressure is less than the preset value, the vehicle-mounted centralized control device and the visual operation digital platform control the vehicle-mounted oil-free screw air compressor and the gas storage tank to replenish air to keep the pipeline plugging tight.

12. The trenchless rehabilitation system for lining buried water supply and drainage pipelines according to claim 10, characterized in that the temporary drainage pipe is temporarily fixed in the well or on the ground by a pipe clamp or a pipe hoop.

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