CN107859141B - Modification method for upstream sewage pipeline of sewage station of nuclear power plant - Google Patents
Modification method for upstream sewage pipeline of sewage station of nuclear power plant Download PDFInfo
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- CN107859141B CN107859141B CN201710945915.3A CN201710945915A CN107859141B CN 107859141 B CN107859141 B CN 107859141B CN 201710945915 A CN201710945915 A CN 201710945915A CN 107859141 B CN107859141 B CN 107859141B
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F3/00—Sewer pipe-line systems
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F3/00—Sewer pipe-line systems
- E03F3/06—Methods of, or installations for, laying sewer pipes
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F3/00—Sewer pipe-line systems
- E03F3/06—Methods of, or installations for, laying sewer pipes
- E03F2003/065—Refurbishing of sewer pipes, e.g. by coating, lining
Abstract
The invention belongs to the technical field of nuclear power station pipeline reconstruction, and provides a reconstruction method of an upstream sewage pipeline of a sewage station of a nuclear power plant, which comprises the steps of firstly adopting a rubber air bag to plug the upstream and downstream of a specific pipeline, and then discharging sewage in a selected pipe section; then, carrying out dredging and primary cleaning on the selected pipe section by adopting a high-pressure water injection mode, and then respectively carrying out manual work and vacuum cleaning to realize dredging and cleaning of the pipeline; then, the endoscopic television detection device with high automation degree runs in the selected pipe section and controls the real-time shooting and data transmission of the selected pipe section so as to detect the damaged condition in the selected pipe section; then, pre-arranging a lining pipe in the selected cleaned pipe section aiming at the specific damaged area, and after the lining pipe is inflated and expanded, attaching and fixing the lining pipe on the inner wall of the original pipeline through ultraviolet curing to form the repair and reconstruction of the original pipeline; the reconstruction method can solve the problems of difficulty and high cost of the existing sewage pipeline repair.
Description
Technical Field
The invention belongs to the technical field of nuclear power plant pipeline reconstruction, and particularly relates to a method for reconstructing an upstream sewage pipeline of a sewage station of a nuclear power plant.
Background
The sewage pipeline inside the nuclear power station is used for discharging domestic sewage and treated radioactive wastewater. The chemical compositions of the sewage or the wastewater are complex, and the sewage or the wastewater is easy to corrode or damage a sewage discharge pipeline in the sewage discharge process, particularly the connection between the wall surface of the pipeline and the pipeline is easy to damage or corrode; therefore, on one hand, rainwater and the like easily enter the sewage system to cause great sewage pressure to the sewage system, and on the other hand, the damage of the sewage pipeline can cause the accumulation of sludge on the wall surface of the pipeline, so that the sewage pipeline is gradually blocked, and the sewage system cannot meet the sewage requirement; the existing treatment mode can only repair, maintain and clean periodically, but the difficulty and the cost of repairing and cleaning are high due to the complex arrangement of pipelines.
Disclosure of Invention
The invention aims to provide a method for modifying a sewage pipeline upstream of a sewage station of a nuclear power plant, and aims to solve the problems of difficulty and high cost of repairing the existing sewage pipeline.
The invention is solved as follows: a method of retrofitting an upstream sewage conduit of a sewage station for a nuclear power plant, comprising the steps of;
s1, pipeline plugging and precipitation, wherein the length of a specific section of the pipeline is selected as a selected pipe section, rubber air bags are simultaneously placed at the upstream end and the downstream end of the selected pipe section, air is injected into the rubber air bags to plug the selected pipe section, and then sewage in the selected pipe section is discharged through drainage equipment;
s2, dredging and dredging the pipeline, namely dredging the selected pipeline section by high-pressure water injection, detecting the selected pipeline section after emptying, carrying out manual dredging, and then carrying out vacuum dirt suction and dredging to ensure that the wall surface of the selected pipeline section is free of dirt;
s3, detecting the pipeline, namely, using an endoscopic television detection device to enter the selected pipe section, and moving back and forth from the upstream end to the downstream end of the selected pipe section, and recording and storing the defect position of the selected pipe section;
s4, repairing the pipeline, namely determining that the area of the pipeline to be repaired is an original pipeline, presetting a lining pipe and a light curing device, then slowly pulling the lining pipe into the original pipeline, then fully expanding the lining pipe to be close to the inner wall of the original pipeline by compressed air, then putting a plurality of ultraviolet lamps at equal intervals to cure the lining pipe and attach the lining pipe to the inner wall of the original pipeline, and finally, flatly cutting the end heads at the two ends of the lining pipe;
and S5, repeating the steps S1-S4, and performing reconstruction and repair on another downstream pipeline section.
Further, in step S1, the upstream pipeline is plugged first, and then the downstream pipeline is plugged, and the length of the selected pipe segment is less than or equal to 200 meters.
Further, in step S1, the detection of the air quality in the selected pipe section is completed before the selected pipe section is plugged, and the water pressure at the upstream plugging end is monitored in real time after the selected pipe section is plugged.
Further, in the step S2, the high-pressure water jet is ejected through a plurality of nozzles with an aperture of 0.5-2.5 mm, and the water outlet speed of the high-pressure water jet is 300-600 m/S.
Further, in the step S2, the high pressure water injection is stopped when the depth of the sludge in the selected pipe section is less than or equal to 1/5 of the pipe diameter of the selected pipe section.
Further, in step S3, the endoscopic tv detection apparatus includes a driving assembly, a camera assembly connected to the driving assembly, and a control assembly for controlling the driving assembly to crawl and control the camera assembly to take images and feed back the images in real time.
Further, the driving assembly comprises a driving trolley, a supporting bracket connected to the driving trolley and a lamp connected to the supporting bracket and used for lighting, and the control assembly comprises a console used for data processing and a cable connected to the driving trolley and used for transmitting signals and calculating the length.
Further, in step S4, the material of the lining tube includes chemical-resistant glass fiber, thermosetting resin, and a photo-curing trigger, and the photo-curing trigger cures the thermosetting resin under the irradiation of ultraviolet light.
Further, in step S4, the lining pipe is a semi-structural lining pipe partially attached to the original pipeline.
Further, the wall thickness of the semi-structural liner is calculated according to the formula;
in the formula: t-lining tube wall thickness (mm);
p is the underground water pressure (MPa) at the top of the pipe;
c-ovality reduction factor;
q is the ovality (%) of the original pipeline, and the ovality of the lining pipe is taken by an inserting method; if the ovality of the original pipeline cannot be measured or the ovality of the lining pipe is unknown, taking 2 percent;
DE-the average internal diameter (mm) of the original pipe;
Dmin-minimum internal diameter (mm) of the original pipe;
Dmax-maximum internal diameter (mm) of the original pipe;
n is a safety factor, and the recommended value is 2.0;
EL-the long-term elastic modulus (MPa) of the lined pipe, either the factory value or 50% of the short-term modulus;
k is the circumferential support rate, and the recommended value is 7.0;
mu-Poisson's ratio, 0.3 is taken as the lining pipe in the in-situ curing method, and 0.45 is taken as the lining pipe in the polyethylene material.
Further, when the percentage of ovality q of the lining pipe is not zero, the wall thickness t of the lining pipe should satisfy the formula (1) and be greater than the calculation result of q in the following formula;
in the formula: sigmaLThe long-term bending strength (MPa) of the lining tube is referred to the factory setting;
SDR-Standard size ratio of pipes (DO/t).
Further, in step S4, the lining pipe is a structural lining pipe that is completely independent of the original pipe and independently bears internal and external pressures.
Further, the wall thickness of the structural liner is calculated according to the formula;
in the formula: q. q.st-total external pressure (MPa) of the pipe;
Rw-a water buoyancy factor, minimum 0.67;
Hw-the groundwater level above the pipe roof is high (m);
h, the thickness (m) of the pipe top covering soil;
γ -Severe (kN/m 3);
WS-dynamic load (MPa);
b' -elastic support coefficient;
ES' -comprehensive deformation modulus (MPa) of soil on the pipe side.
EL-the long-term elastic modulus (MPa) of the lined pipe, either the factory value or 50% of the short-term modulus;
n is a safety factor, and the recommended value is 2.0;
c-ovality reduction factor;
k is the circumferential support rate, and the recommended value is 7.0.
DO-inner liner outside diameter (mm);
further, the ratio of the overflowing capacity of the repaired pipeline to the overflowing capacity of the pipeline before repair at full flow is calculated according to the following formula;
in the formula: b-the ratio of the overflowing capacity before and after pipeline repair;
neroughness factor of the original pipe
nlRoughness factor of the liner tube.
DI-repairing the internal diameter of the pipe;
DE-the original pipe internal diameter;
further, in step S4, before the lining pipe is pulled into the original pipeline, a pad film is laid in the pipeline, the pad film is placed at the bottom of the original pipeline, and the pad film covers a circumference of the original pipeline which is greater than 1/3.
Further, in step S4, when the liner pipe is pulled into the original pipe, the pulling speed is less than 5m/min, and the pulling force for pulling is less than 122 KN.
Further, in step S4, when the liner tube is expanded, the pressure of the air is uniformly increased to 100mbar at a rate of 10mbar/min, then increased from 100mbar to 150mba at a rate of 50mba/min at maximum to fully expand the liner tube, and then the pressure of the air is slowly increased to 450mbar and maintained for at least 10 min.
Further, in step S4, after the inner liner tube is fully expanded, a lamp holder connected with a plurality of ultraviolet lamps is quickly placed into the inner liner tube, and a time interval for sequentially turning on the plurality of ultraviolet lamps is set.
Further, the lamp holder is slowly drawn in and linearly arranged in the axial direction of the lining pipe, and in the drawing-in process of the lamp holder, the lining pipe is always tightly attached to the inner wall of the original pipeline under the action of pressure.
Furthermore, the lamp-on interval of two adjacent ultraviolet lamps is 60s, and the advancing speed of the lamp holder is 70-80 cm/min.
Compared with the existing repairing method, the method for modifying the sewage pipeline upstream of the sewage station of the nuclear power plant has the technical effects that: the original pipeline is plugged by the rubber air bag, so that the pipeline to be modified can be divided into a plurality of independent pipeline sections, the plugging does not affect the pollution discharge use of surrounding residents, meanwhile, the plugging mode is simple and effective and can be used repeatedly, the dredging and desilting processes are simpler and more efficient, the safety is better, after the original pipeline is cleaned, the video recording detection is carried out through an automatic endoscopic television detection device, the detection efficiency can be higher, and meanwhile, the determination of different defect positions is more accurate; the restoration of former pipeline part adopts interior bushing pipe cooperation photocuring device to realize the overlay type restoration, and its restoration mode degree of automation is high, and the repair efficiency is high, has saved a large amount of manual works and material cost simultaneously, and the corrosion-resistant effectual of interior bushing pipe in addition, and then more durable after former pipeline restoration.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a flowchart of a modification method according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Referring to fig. 1, in an embodiment of the present invention, there is provided a method for modifying a sewage pipe upstream of a sewage station of a nuclear power plant, including the steps of;
s1, pipeline plugging and precipitation, wherein the length of a specific section of the pipeline is selected as a selected pipe section, rubber air bags are simultaneously placed at the upstream end and the downstream end of the selected pipe section, air is injected into the rubber air bags to plug the selected pipe section, and then sewage in the selected pipe section is discharged through drainage equipment;
in the step, before plugging operation, the running condition and the water flow information of the selected pipe section are investigated and mastered, the proper length of the pipeline is selected according to the actual pipeline condition and the water flow intensity in the pipeline, certain threat to downstream constructors due to the water pressure generated by the accumulated water at the upstream caused by overlong plugging time is avoided, the plugging distance is carried out according to the actual condition, plugging is carried out according to the water inlets of the upstream and intersection wells, and the guardrails or the striking marks are opened and placed on the well covers in the range of the road section to be constructed before plugging.
The length of the selected pipe section is preferably selected to be 3-4 well positions for construction, the distance between wells is 50 meters of the standard, and of course, if the distance is a non-standard road section, the distance is not more than 200 meters.
In this embodiment, the rubber airbag is preferably an inflatable airbag, and the rubber airbag is preferably a cylindrical airbag, which is also beneficial to avoiding incomplete drainage caused by a height difference of a part of well locations, and meanwhile, the inflatable rubber airbag has better safety, and can be recycled, thereby avoiding waste of maintenance cost.
And simultaneously, after plugging is finished, the water level in the selected pipe section is timely drained and lowered, and water in the selected pipe section is drained to a downstream pipeline isolated by plugging by using drainage equipment, preferably a submersible sludge pump. Meanwhile, in some areas with high utilization rate of sewage pipes, in order to ensure that the construction of the pipes does not influence the use of sewage discharge, a high-power sludge pump can be used to stride over a selected pipe section, connect the upstream and the downstream, and discharge upstream drainage into a downstream pipe network.
Meanwhile, the selected pipe section needs to be judged in advance before the selected pipe section is plugged, when the water level in the selected pipe section is more than 30% of the pipe diameter, the selected pipe section needs to be plugged and pumped, and if the water level is less than 30%, the subsequent steps are directly carried out. Before plugging, toxic and harmful gas detection needs to be carried out on the selected pipe section; the detection method is that the inspection well cover of the selected pipe section is opened, after slight ventilation, the concentration of the toxic explosive gas in the selected pipe section is measured by adopting a hydrogen sulfide detector, and the concentration does not exceed the specified standard and the next operation can be carried out later. Certainly, if the toxic gas exceeds the standard, the ventilation equipment is required to be adopted for blowing and ventilating, and the well descending operation can be started after the safety is confirmed again.
Dredging and dredging the pipeline, namely dredging the selected pipeline section by high-pressure water injection, detecting emptying, then carrying out manual dredging, and then carrying out vacuum dirt suction and dredging to ensure that the wall surface of the selected pipeline section is free of dirt;
in the step, the dredging process of the pipeline adopts a high-pressure water jetting technology of a high-pressure water jetting vehicle to carry out dredging and dredging on the selected pipe section, the sediment and the obstacles in the selected pipe section can be effectively removed, the high-pressure water jetting cleaning technology is that ordinary tap water is pressurized by hundreds of or even thousands of atmospheric pressures and then passes through a plurality of special nozzles, the aperture of each nozzle is preferably 0.5-2.5 mm, one or more water flows with highly concentrated energy are jetted at a high speed, the speed of the water flow is preferably 300-600 m/s, and the water flow continuously acts on the cleaned surface of the selected pipe section with strong impact kinetic energy, so that the dirt is peeled off; simultaneously, the dirt in the selected pipe section is lifted out of the selected pipe section and then is removed by the thrust of water flow, so that the cleaning purpose is achieved.
After the high-pressure water injection is finished, when sediments with larger volume still exist in the selected pipe section, manual cleaning and fishing are required to be arranged under the condition that the quality of air in the selected pipe section is detected to be qualified; and finally, cleaning and fishing the sludge part which cannot be cleaned and fished by a vacuum sewage suction truck, thereby finally realizing the condition that the inner wall surface of the selected pipe section is clean and free of scale.
In the process of vacuum sewage suction, a novel environmental sanitation vacuum sewage suction truck is adopted, the vacuum sewage suction truck collects, transfers and cleans the transported sludge and sewage, the novel environmental sanitation vehicle avoids secondary pollution, the sewage suction truck can self-suck and self-discharge, the working speed is high, the capacity is large, the transportation is convenient, and the vacuum sewage suction truck is suitable for collecting and transporting liquid substances such as excrement, slurry, crude oil and the like.
S3, detecting the pipeline, namely, using an endoscopic television detection device to enter the selected pipe section, and moving back and forth from the upstream end to the downstream end of the selected pipe section, and recording and storing the defect position of the selected pipe section;
in this step, the endoscopic television detection device comprises a driving assembly, a camera assembly connected to the driving assembly, and a control assembly for controlling the driving assembly to crawl and control the camera assembly to shoot and feed back in real time. The driving assembly comprises a driving trolley, a supporting bracket connected to the driving trolley and a lamp connected to the supporting bracket and used for lighting, and the control assembly comprises a console used for data processing and a cable connected to the driving trolley and used for transmitting signals and calculating the length. The camera shooting assembly can perform image processing, and the control assembly can record the rotation and the positioning of the camera. Has high-quality image recording and character editing functions. According to different pipe diameters, different types of endoscopic television detection devices can be selected. The condition in the pipeline can be listed completely through the pipeline information processing device. A
In the detection process, firstly, the inspection lens of the remote control endoscopic television detection device is sent into the cleaned selected pipe section, and the condition in the selected pipe section is simultaneously transmitted to the television monitoring screen and the computer. The special record of operating personnel can check the whole detection process one by one and record the digital image file into the computer hard disk, if abnormal phenomena occur in the detection process, the operating personnel can operate the equipment to rotate, and the details of the defect point can be checked in detail. In order to facilitate the analysis of the inspection result in the later period, when the inspection device of the peeping television is used for inspection, the abnormal point stays for a moment to obtain a clear image; in which defects such as pipe leaks, pipe branch joints, etc., which may affect the increase in pipe flow, need to be recorded in detail and carefully observed by operating the equipment at the time of inspection. After the detection of the endoscopic television detection device is finished, all files (such as image files and the like) generated in the detection process are converted into a file format which can be browsed and played on a client computer, and are carved into an optical disk for a user to use.
S4, repairing the pipeline, namely determining that the area of the pipeline to be repaired is an original pipeline, presetting a lining pipe and a light curing device, then slowly pulling the lining pipe into the original pipeline, then fully expanding the lining pipe to be close to the inner wall of the original pipeline by compressed air, then putting a plurality of ultraviolet lamps at equal intervals to cure the lining pipe and attach the lining pipe to the inner wall of the original pipeline, and finally, flatly cutting the end heads at the two ends of the lining pipe;
in this step, the in situ curing process can be selected according to the conditions of the original pipeline and the actual needs of the owner, and the curing process comprises designing the liner into a structural liner, a semi-structural liner and a non-structural liner. Wherein, the structural liner tube is completely independent of the original pipeline and can independently bear the internal pressure and the external pressure; the semi-structural liner tube can be partially supported on the original pipeline and can independently bear the internal pressure and the underground water pressure; the non-structural liner tube can independently bear internal pressure and external pressure depending on the original pipeline.
Meanwhile, regarding the selection of the inner liner tube, in this embodiment, the main materials of the inner liner tube are ECR (E-Glass of Chemical Resistance) Glass fiber, thermosetting resin, and photo-curing initiator. The ECR glass fiber is based on E glass component, 1-4% of TiO2 and ZnO are added, B2O3 and F2 are not contained, and the ECR glass fiber is environment-friendly in production. The corrosion resistance of the ECR glass fiber is the best among all glass fibers, is the first choice of composite materials in harsh environments, and is mainly applied to environmental protection equipment, chemical storage tanks, boats, chemical pipelines, desulfurizing towers, electrical equipment and the like. The thermosetting resin in the lined pipe is Unsaturated Polyester (UP), which has good corrosion resistance. The photo-initiator is added to the synthetic resin and reacts only to the irradiation of ultraviolet light. These photonic triggers generate radicals upon exposure to ultraviolet light, thereby triggering the polymerization process. That is, polyester or polyvinyl ester chain clusters are cross-linked with styrene in the chain clusters present in the resin, resulting in the formation of a cured resin matrix.
In this embodiment, the initial elastic modulus of the glass fiber lining material after curing can reach 12000MPa, while the elastic modulus of the common polyethylene material tube is 800MPa, which is only equal to 1/15 of the glass fiber lining material.
During construction of the inner liner pipe, the pulling direction of the inner liner pipe is preferably determined according to site conditions, the inner liner pipe is prevented from being in a closed wooden box, the ultraviolet curing vehicle is put in place, then the sunshade tent is set up to shield the wooden box and the well position of the inner liner pipe, then the guide pulleys are installed, the inner liner pipes at two ends of the pipeline are provided with the binding heads, and the water stop belts are bound at two ends of the binding heads.
Then, the lining pipe is slowly pulled into the original pipeline, a cushion film is paved in the original pipeline before the lining pipe is pulled, the cushion film is placed at the bottom of the original pipeline and covers the circumference of the pipeline which is larger than 1/3, and the cushion film is paved to reduce the friction force during the pulling process of the lining pipe and avoid scratching the lining pipe. When the lining pipe is pulled in, the lining pipe impregnated with the resin is smoothly, flatly and slowly pulled into the original pipeline along the pad film at the bottom of the pipeline, the pulling speed is not more than 5m/min, and the pulling force is not more than 122 KN. Therefore, the lining pipe can be ensured to be more uniformly arranged in the original pipeline.
After the lining pipe is pulled in, the lining pipe is fully expanded and expanded to be tightly attached to the inner wall of the original pipeline through compressed air, the pressure is increased to 100mbar at the speed of 10mbar/min, then the pressure is increased from 100mbar to 150mba at the speed of 50mba/min at most to fully expand the lining pipe, and then the pressure is slowly increased to the working pressure of 450mbar and is kept for at least 10 min. This allows the liner tube to expand sufficiently and uniformly.
Then, stopping inflating, opening a binding head close to one end of the ultraviolet lamp curing vehicle, quickly putting 8 ultraviolet lamp brackets with 1000W ultraviolet light into the binding head, firstly opening a first ultraviolet lamp on the lamp brackets, and then opening an ultraviolet lamp on a second lamp bracket after a certain lamp opening time interval, wherein the lamp opening time interval is preferably 60 s.
And then drawing the lamp holder into the lining pipe, wherein the drawing speed of the lamp holder is determined by combining the pipe diameter, the wall thickness and the lamp holder of the original pipe, the drawing speed of the lamp holder is controlled to be half of the preset speed within the front 0.5m range of the solidification starting end, then the drawing speed is increased to the preset speed, and when the drawing speed reaches 1.0m of the solidification end, the drawing speed is reduced to be half of the preset speed until the end point. This may result in a more uniform curing process of the liner tube. Here, the predetermined speed of the lamp holder is preferably 70cm to 80 cm/min.
In addition, the pressure inside the lining pipe should be kept during the curing process so that the lining pipe is tightly contacted with the original pipeline.
After the liner tube is cured, the pressure in the tube should be slowly reduced to atmospheric pressure. And (4) removing the station head after curing, pulling out the bottom film, and cutting the end of the lining pipe to be flat. In the whole process, the smooth surface of the repaired lining pipe is required to be ensured, and obvious wrinkles and bulges do not exist; the wall thickness and the strength of the lining pipe meet the design requirements; the inner surface of the lining pipe has no water leakage and seepage signs; the lining pipe meets the requirements of a water-closing test.
And S5, repeating the steps S1-S4, and performing reconstruction and repair on another downstream pipeline section. Until all the pipelines needing to be modified are repaired.
Specifically, in the embodiment of the present invention, according to actual needs, the structure of the lining pipe may be designed as a semi-structural lining pipe, the semi-structural lining pipe depends on the structure of the original pipeline, and only needs to bear external hydrostatic pressure within the designed life, and the external soil pressure and dynamic load are still supported by the original pipeline.
The wall thickness of a particular non-structural liner tube is preferably calculated by the following formula:
in the formula: t-lining tube wall thickness (mm);
p is the underground water pressure (MPa) at the top of the pipe;
c-ovality reduction factor;
q is the ovality (%) of the original pipeline, and the ovality of the lining pipe is taken by an inserting method; if the ovality of the original pipeline cannot be measured or the ovality of the lining pipe is unknown, taking 2 percent;
DE-the average internal diameter (mm) of the original pipe;
Dmin-minimum internal diameter (mm) of the original pipe;
Dmax-maximum internal diameter (mm) of the original pipe;
n is a safety factor, and the recommended value is 2.0;
EL-the long-term elastic modulus (MPa) of the lined pipe, either the factory value or 50% of the short-term modulus;
k is the circumferential support rate, and the recommended value is 7.0;
mu-Poisson's ratio, 0.3 is taken as the lining pipe in the in-situ curing method, and 0.45 is taken as the lining pipe in the polyethylene material.
When the percentage of ovality q of the lining tube is not zero, the wall thickness t of the lining tube should, in addition to satisfying formula (1), be greater than the calculation of q in the following formula:
in the formula: sigmaLThe long-term bending strength (MPa) of the lining tube is referred to the factory setting;
SDR-Standard size ratio of pipes (DO/t).
Specifically, in the embodiment of the invention, when the lining pipe needs to be arranged to be a structural lining pipe, the structural lining pipe has the performance of independently bearing the actions of external hydrostatic pressure, soil pressure and dynamic load without depending on the original pipeline structure.
The wall thickness of the particular structural liner tube is preferably calculated using the following formula, which is required for semi-structural repairs:
in the formula: q. q.st-total external pressure (MPa) of the pipe;
Rw-a water buoyancy factor, minimum 0.67;
Hw-the groundwater level above the pipe roof is high (m);
h, the thickness (m) of the pipe top covering soil;
γ -Severe (kN/m 3);
WS-dynamic load (MPa);
b' -elastic support coefficient;
ES' -comprehensive deformation modulus (MPa) of soil on the pipe side.
EL-the long-term elastic modulus (MPa) of the lined pipe, either the factory value or 50% of the short-term modulus;
n is a safety factor, and the recommended value is 2.0;
c-ovality reduction factor;
k is the circumferential support rate, and the recommended value is 7.0.
DO-inner liner outside diameter (mm);
specifically, in the embodiment of the present invention, the ratio of the flow capacity of the pipeline after the repair to the flow capacity of the pipeline before the repair at the full flow is calculated according to the following formula;
in the formula: b-the ratio of the overflowing capacity before and after pipeline repair;
neroughness factor of the original pipe
nlRoughness factor of the liner tube.
DI-repairing the internal diameter of the pipe;
DE-the original pipe internal diameter;
by the method for transforming the upstream sewage pipeline of the sewage station of the nuclear power plant, the original pipeline is blocked by the rubber air bag, the pipeline to be transformed can be divided into a plurality of independent pipeline sections, the blockage does not influence the pollution discharge use of surrounding residents, the blocking mode is simple, effective and reusable, the dredging and dredging processes are simpler and more efficient, the safety is better, after the original pipeline is cleaned, the automatic endoscopic television detection device is used for shooting and recording detection, the detection efficiency is higher, and the determination of different defect positions is more accurate; the restoration of former pipeline part adopts interior bushing pipe cooperation photocuring device to realize the overlay type restoration, and its restoration mode degree of automation is high, and the repair efficiency is high, has saved a large amount of manual works and material cost simultaneously, and the corrosion-resistant effectual of interior bushing pipe in addition, and then more durable after former pipeline restoration.
The quality of engineering can be effectively improved by adopting the modification method; the pipeline lining repairing material meets the requirements of China, industry and specifications, is suitable for concrete structure pipelines, can be completely fixed on a concrete structure, forms bridge connection on pipeline cracks and has reliable strength, the pipeline lining material is a high-molecular resin material, has stable performance, can ensure the safe and lasting sealing performance of a product even in a severe environment through scientific configuration, and has outstanding chemical corrosion resistance, excellent wear resistance and long service life; good tear resistance and good heat deformation resistance, can adapt to secondary deformation, and has high impact strength and excellent shearing resistance; excellent compression resistance and high-density anti-seepage performance, remarkable anti-seepage effect, smooth lining surface and capability of improving drainage capacity.
Meanwhile, the construction progress can be accelerated, and the construction period is ensured; the novel trenchless lining repairing construction technology for the sewage pipeline reconstruction engineering pipeline reduces the steps of not dismantling upper components of the pipeline and protecting the repairing of an upper structure by trenching the road, and reduces the trenching repairing time. From the processing of the lining material, preparation of a construction site, ultraviolet curing and secondary detection only take about 4 hours. The non-excavation creates good conditions for construction, and greatly accelerates the construction progress.
In addition, the environment can be protected, the resources are saved, the construction cost is reduced, and the economic benefit is remarkable; the novel trenchless lining repairing construction technology for the sewage pipeline reconstruction engineering pipeline reduces the steps of not dismantling upper components of the pipeline and not excavating the road, protects the repairing of an upper structure, does not generate garbage and does not block traffic. The excavation repair cost is reduced, and the economic benefit is remarkable.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (18)
1. A modification method of an upstream sewage pipeline of a sewage station for a nuclear power plant is characterized by comprising the following steps: comprises the following steps;
s1, pipeline plugging and precipitation, wherein the length of a specific section of the pipeline is selected as a selected pipe section, rubber air bags are simultaneously placed at the upstream end and the downstream end of the selected pipe section, air is injected into the rubber air bags to plug the selected pipe section, and then sewage in the selected pipe section is discharged through drainage equipment;
s2, dredging and dredging the pipeline, namely dredging the selected pipeline section by high-pressure water injection, detecting the selected pipeline section after emptying, carrying out manual dredging, and then carrying out vacuum dirt suction and dredging to ensure that the wall surface of the selected pipeline section is free of dirt;
s3, detecting the pipeline, namely, using an endoscopic television detection device to enter the selected pipe section, and moving back and forth from the upstream end to the downstream end of the selected pipe section, and recording and storing the defect position of the selected pipe section;
s4, repairing the pipeline, namely determining that the area of the pipeline to be repaired is an original pipeline, presetting a lining pipe and a light curing device, arranging tie heads on the lining pipes at two ends of the pipeline, binding water stop belts at two ends of the tie heads, slowly pulling the lining pipe into the original pipeline, then compressing air to fully expand the lining pipe to be close to the inner wall of the original pipeline, then putting a plurality of ultraviolet lamps at equal intervals to cure the lining pipe and attach the lining pipe to the inner wall of the original pipeline, and finally flatly cutting two end heads of the lining pipe; after the inner lining pipe is fully expanded, opening a binding head close to one side of the ultraviolet lamp curing vehicle, quickly putting a lamp holder connected with a plurality of ultraviolet lamps into the inner lining pipe, and setting the time interval for sequentially turning on the ultraviolet lamps; the lamp holder is slowly pulled in and linearly arranged in the axial direction of the lining pipe, and in the process of pulling in the lamp holder, the lining pipe is always tightly attached to the inner wall of the original pipeline under the action of pressure; the drawing speed of the lamp holder is controlled to be half of the preset speed within the first 0.5m of the curing starting end, then the speed is increased to the preset speed, and when the speed reaches the curing end, the speed is reduced to be half of the preset speed until the end.
And S5, repeating the steps S1-S4, and performing reconstruction and repair on another downstream pipeline section.
2. The method of retrofitting a sewer pipe upstream of a sewage station for a nuclear power plant of claim 1, wherein: in step S1, the upstream pipeline is plugged first, and then the downstream pipeline is plugged, and the length of the selected pipe segment is less than or equal to 200 meters.
3. The method of retrofitting a sewer pipe upstream of a sewage station for a nuclear power plant of claim 1, wherein: in step S1, the quality of the air in the selected pipe section is detected before the selected pipe section is plugged, and the water pressure at the upstream plugging end is monitored in real time after the selected pipe section is plugged.
4. The method of retrofitting a sewer pipe upstream of a sewage station for a nuclear power plant of claim 1, wherein: in the step S2, the high-pressure water jet is ejected through a plurality of nozzles with an aperture of 0.5-2.5 mm, and the water outlet speed of the high-pressure water jet is 300-600 m/S.
5. The method of retrofitting a sewer pipe upstream of a sewage station for a nuclear power plant of claim 1, wherein: in step S2, the high pressure water injection is stopped when the depth of the sludge in the selected pipe section is less than or equal to 1/5 of the pipe diameter of the selected pipe section.
6. The method of retrofitting a sewer pipe upstream of a sewage station for a nuclear power plant of claim 1, wherein: in step S3, the endoscopic tv detection apparatus includes a driving assembly, a camera assembly connected to the driving assembly, and a control assembly for controlling the driving assembly to crawl and control the camera assembly to take images and feed back the images in real time.
7. The method of retrofitting a sewer pipe upstream of a sewage station for a nuclear power plant of claim 6, wherein: the driving assembly comprises a driving trolley, a supporting bracket connected to the driving trolley and a lamp connected to the supporting bracket and used for lighting, and the control assembly comprises a console used for data processing and a cable connected to the driving trolley and used for transmitting signals and calculating the length.
8. The method of retrofitting a sewer pipe upstream of a sewage station for a nuclear power plant of claim 1, wherein: in step S4, the material of the lining tube includes chemical-resistant glass fiber, thermosetting resin, and photo-curing trigger, and the photo-curing trigger cures the thermosetting resin under the irradiation of ultraviolet light.
9. The method of retrofitting a sewer pipe upstream of a sewage station for a nuclear power plant of claim 1, wherein: in step S4, the lining pipe is a semi-structural liner pipe partially attached to the original pipe.
10. The method of retrofitting a sewer pipe upstream of a sewage station for a nuclear power plant of claim 9, wherein: the wall thickness calculation formula of the semi-structural liner tube is as follows;
In the formula: t-lining tube wall thickness (mm);
p is the underground water pressure (MPa) at the top of the pipe;
c-ovality reduction factor;
q is the ovality (%) of the original pipeline, and the ovality of the lining pipe is taken by an inserting method; if the ovality of the original pipeline cannot be measured or the ovality of the lining pipe is unknown, taking 2 percent;
DE-the average internal diameter (mm) of the original pipe;
Dmin-minimum internal diameter (mm) of the original pipe;
Dmax-maximum internal diameter (mm) of the original pipe;
n is a safety factor, and the recommended value is 2.0;
EL-the long-term elastic modulus (MPa) of the lined pipe, either the factory value or 50% of the short-term modulus;
k is the circumferential support rate, and the recommended value is 7.0;
mu-Poisson's ratio, 0.3 is taken as the lining pipe in the in-situ curing method, and 0.45 is taken as the lining pipe in the polyethylene material.
11. The method of retrofitting a sewer pipe upstream of a sewage station for a nuclear power plant of claim 10, wherein: when the percentage of the ovality q of the lining pipe is not zero, the wall thickness t of the lining pipe is larger than the calculation result of q in the following formula except that the wall thickness t satisfies the formula (1);
in the formula: sigmaLThe long-term bending strength (MPa) of the lining tube is referred to the factory setting;
SDR-Standard size ratio of pipes (DO/t).
12. The method of retrofitting a sewer pipe upstream of a sewage station for a nuclear power plant of claim 1, wherein: in step S4, the lining pipe is a structural lining pipe that is completely independent of the original pipe and independently bears internal and external pressures.
13. The method of retrofitting a sewer pipe upstream of a sewage station for a nuclear power plant of claim 12, wherein: the wall thickness of the structural liner tube is calculated according to the formula;
in the formula: q. q.st-total external pressure (MPa) of the pipe;
Rw-a water buoyancy factor, minimum 0.67;
Hw-the groundwater level above the pipe roof is high (m);
h, the thickness (m) of the pipe top covering soil;
γ -Severe (kN/m 3);
WS-dynamic load (MPa);
b' -elastic support coefficient;
ES' -pipe side soil comprehensive deformation modulus (MPa);
EL-the long-term elastic modulus (MPa) of the lined pipe, either the factory value or 50% of the short-term modulus;
n is a safety factor, and the recommended value is 2.0;
c-ovality reduction factor;
k is the circumferential support rate, and the recommended value is 7.0;
DOinner liner outside diameter (mm).
14. The method of retrofitting a sewer pipe upstream of a sewage station for a nuclear power plant of claim 1, wherein: the ratio of the overflowing capacity of the repaired pipeline to the overflowing capacity of the pipeline before repair at full flow is calculated according to the following formula;
in the formula: b-the ratio of the overflowing capacity before and after pipeline repair;
neroughness factor of the original pipe
nlRoughness factor of the liner tube.
DI-repairing the internal diameter of the pipe;
DEoriginal pipe inner diameter.
15. The method of retrofitting a sewer pipe upstream of a sewage station for a nuclear power plant of claim 1, wherein: in step S4, before the lining pipe is pulled into the original pipeline, a pad film is laid in the original pipeline, the pad film is placed at the bottom of the original pipeline, and the pad film covers a circumference of the original pipeline larger than 1/3.
16. The method of retrofitting a sewer pipe upstream of a sewage station for a nuclear power plant of claim 1, wherein: in step S4, when the liner pipe is pulled into the original pipe, the pulling speed is less than 5m/min, and the pulling force is less than 122 KN.
17. The method of retrofitting a sewer pipe upstream of a sewage station for a nuclear power plant of claim 1, wherein: in step S4, when the liner tube is inflated, the pressure of the air is uniformly increased to 100mbar at a rate of 10mbar/min, then the liner tube is fully expanded by increasing the pressure from 100mbar to 150mba at a rate of 50mba/min at maximum, and then the pressure of the air is slowly increased to 450mbar and maintained for at least 10 min.
18. The method of retrofitting a sewer pipe upstream of a sewage station for a nuclear power plant of claim 1, wherein: the lamp-on interval of two adjacent ultraviolet lamps is 60s, and the advancing speed of the lamp holder is 70-80 cm/min.
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| CN108597631A (en) * | 2018-04-27 | 2018-09-28 | 三门核电有限公司 | A kind of water source partition method of nuclear power plant's Coolant Pump |
| CN109237198A (en) * | 2018-11-12 | 2019-01-18 | 上海辉拓市政工程有限公司 | A kind of urban underground water drainage pipe road profession restorative procedure |
| CN109237197A (en) * | 2018-11-12 | 2019-01-18 | 上海辉拓市政工程有限公司 | A kind of reinforcement and repair method based on ultraviolet light solidification pipeline |
| CN110185133B (en) * | 2019-05-05 | 2021-04-06 | 上海信立生态环境工程有限公司 | Method for cleaning sewage pipeline |
| CN112524390A (en) * | 2019-09-17 | 2021-03-19 | 浙江长兴市政建设有限公司 | Municipal pipeline UV lining method in-situ curing repair construction method |
| CN111926907A (en) * | 2020-06-28 | 2020-11-13 | 宁波宏川环境科技有限公司 | Pipeline dredging and dredging method |
| CN113175069A (en) * | 2021-04-29 | 2021-07-27 | 北京市政建设集团有限责任公司 | Detection method and equipment for sewage pipeline |
| CN117172023A (en) * | 2023-09-21 | 2023-12-05 | 上海管康技术有限公司 | Water supply pipeline restoration structure design method and device |
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| CN101900239B (en) * | 2010-05-26 | 2011-11-02 | 林永志 | Method for repairing drainage pipeline without water supply suspended |
| CN102486247B (en) * | 2010-12-02 | 2014-04-09 | 杨兵 | Water supply and drainage pipeline repair technique adopting size film lining method |
| CN106678492A (en) * | 2016-12-27 | 2017-05-17 | 广州市市政集团有限公司 | Construction method for repairing collapsing pipeline in non-excavation manner |
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