CN115492215A - Non-excavation dredging and repairing construction method for drainage pipeline - Google Patents

Abstract

The invention discloses a drainage pipeline non-excavation dredging and repairing construction method, and belongs to the technical field of pipeline repairing. The method is realized by seven steps of pipeline plugging, pipeline diversion and precipitation, pipeline temporary drainage and precipitation, pipeline dredging, special pipeline cleaning and well chamber cleaning, pipeline foreign matter cleaning and trenchless repair. The air bag plugging method of the invention installs rubber air bags on the upstream and the downstream of the cleaning area section for plugging, cuts off all water inlet sources, controls corresponding water level, reduces water head pressure and improves operation safety. According to the invention, the temporary drainage pipeline is erected, and water is pumped into the temporary pipeline by the water pump and drained into a downstream well, so that the requirement of no water or little water in the pipeline can be realized, and the pipeline detection is convenient. The invention adopts the alkali-free glass fiber hose, after being fully impregnated by resin, the hose is pulled into a pipeline to be repaired from an inspection well, the hose is expanded to be round by air pressure, and a firm and smooth new lining pipe is formed after ultraviolet light curing, thereby achieving the aim of repairing.

Description

Non-excavation dredging and repairing construction method for drainage pipeline

Technical Field

The invention belongs to the technical field of pipeline repair, and particularly relates to a non-excavation dredging and repairing construction method for a drainage pipeline.

Background

The urban drainage pipe network is an indispensable important infrastructure of the modern city and plays a role in collecting and conveying urban rainwater and sewage, is a basic industry with global and precedent influence on urban economic development, is a backbone of urban water pollution control and urban drainage and flood control, and is an important mark for measuring the level of the modern city. At present, the non-excavation dredging and repairing of drainage pipelines in China has no corresponding national standard and standard, and only has an industrial standard. Along with the continuous acceleration of the urban construction in China, the urban drainage pipeline is trenchless to remove the silt and has wide repairing prospect.

Along with the development of cities, the scale of urban underground pipe networks is continuously enlarged, large quantities of underground pipelines reach or approach the service life at times due to long laying time, and normal operation of drainage pipelines has attracted social attention, so that trenchless dredging, detection and repair of drainage pipe networks have important significance for repairing urban drainage functions.

Non-excavation desilting of drainage pipe, restoration construction site are more dispersed, and mostly are the construction in the city, consequently require construction safety protection to require high, civilized construction level is high, the construction continuity is strong, the work progress is invisible, city construction disturb characteristics such as big. Aiming at the characteristics, a flexible and changeable method according to local conditions is required to be adopted, construction operation is reasonably arranged, and construction of a branch line and a branch group is carried out. Actively and coordinately eliminating various interferences in urban construction, strengthening safety protection, ensuring field civilized construction and putting various emergency disposal measures in place; organizing a professional construction team with advanced equipment to carry out construction, and completing the construction safely, quickly and orderly; meanwhile, the collection of on-site construction images is enhanced, and the safe and civilized construction measures for the operation in the limited space are ensured to be implemented in place.

The pipeline repairing technology mainly appears along with the aging of urban infrastructure, and pipeline systems such as urban drainage, gas and the like are also like other structures for a long time and have higher and higher possibility of being damaged. The pipeline is buried deeply underground, so that the specific conditions of the underground pipeline cannot be well understood to a certain extent, the facilities are damaged without any warning, and the operation is interrupted as a result of the damage, so that the pipeline owner not only bears great economic loss, but also brings about environmental and social problems.

Disclosure of Invention

The invention aims to provide a drainage pipeline non-excavation dredging and repairing construction method aiming at the defects of the background technology.

In order to achieve the purpose, the invention adopts the following technical scheme:

a drainage pipeline non-excavation dredging and repairing construction method comprises the following steps:

1) Pipeline plugging: when the upstream water flow is small and the water level in the well is low, sand bags can be used for plugging, and bricklaying plugging is matched with an air bag for use;

2) Guiding water and lowering water in the pipeline: before pipeline construction, plugging the pipe orifice of an initial end inspection well, arranging a water pump and a water belt in the inspection well upstream of the inspection well, and guiding water to the other section of pipeline;

3) And (3) temporarily discharging and dewatering the pipeline: the pipeline is blocked in sections, the blocking distance is 100-200m, a temporary drainage pipeline is erected, and water is pumped into the temporary pipeline by a water pump and drained into a downstream well;

4) Clearing and dredging pipelines:

(1) high-pressure cleaning: starting construction from a downstream wellhead, placing a nozzle and a hose into a pipeline, and placing a spray head at the tail end of the pipeline before turning on a pump;

(2) sewage suction of a sewage suction truck: filling the sludge such as the cleaned sludge and garbage into a woven bag, transporting the woven bag to a designated place, and providing a waste discharge treatment place;

5) Special cleaning of pipelines and cleaning of well chambers: sand and stones are deposited in the pipeline, which cannot be cleared by a sewage suction truck and a cleaning truck, are cleared by a method of manually pulling cattle by a hinging machine, and are manually cleared, bagged, abandoned and transported;

6) Removing foreign matters in the pipeline: cutting off tree roots, cement blocks and exposed reinforcing meshes in the drainage pipeline by using milling cutters of different types;

7) Trenchless repair

(1) The method comprises the steps of (1) overall repairing of a pipeline, namely ultraviolet curing repairing, wherein ultraviolet curing and UV-CIPP repairing are adopted;

(2) ultraviolet light curing construction

1.1, detecting toxic and harmful gases in the pipeline;

1.2, dragging into a basement membrane;

1.3, pulling in a CIPP lining hose;

1.4, installing a binding head and placing the binding head into a lamp holder;

1.5, curing the hose;

1.6, post-processing;

1.7, and checking and accepting the repaired UV-CIPP lining.

In some examples, the pipeline plugging in step 1) adopts air bag plugging, the lower bag position of the pipeline plugging adopts 1 air bag at the upper and lower openings of the wellhead at the upstream and downstream of the pipe section to be cleaned, and stainless steel baffle walls are added at two sides of the construction pipe section to support the plugging air bags.

In some examples, the pipeline plugging in step 3) is performed by using a balloon plugging device.

In some examples, the flushing efficiency interval in the step (1) of clearing the pipeline is that the back-falling speed is controlled to be 100-200 mm/s.

In some examples, the step 1.3 includes the steps of:

1) Before the hose enters the pipeline to be repaired, a rope pulled in the pipeline along with the bottom film is used for pulling a steel wire rope of the winch to the other end of the pipeline to be repaired;

2) Before the hose enters the pipeline to be repaired, rollers or fixed pulleys are arranged at all direction-changing well mouths and pipe orifices of the pipeline where the hose enters the pipeline, the rollers or the fixed pulleys are fixed by using a lead screw, and the hose is directly contacted with other objects to be repaired to be provided with a liner plastic cloth;

3) The hose is connected with a traction steel wire rope of a winch, the two sides of one end of the hose are folded inwards by one third respectively, then a hoisting belt is placed at the bottom of the folding line and then the hose is folded by 0.4-0.5 m in a longitudinal mode, then the end part of the hose is fastened by a binding belt, the end part of the hose before fastening is provided with a protective bottom film, and finally a universal U-shaped hoisting ring is used for connecting the hoisting belt with a steel wire rope sleeve of the winch;

4) Starting the winch to pull the hose into the pipeline to be repaired, wherein the connection between the winch and personnel at the hose section is kept smooth, and the pulling speed is controlled within 0.6 m/s;

5) When the length of the outer hose of the wellhead is close to the depth of the well, the winch is stopped, the tail of the hose and the rope are tightened by the binding belt, then counter force is applied, and the winch is started again to pull the hose until the front end of the hose exceeds the pipeline to be repaired by 0.5 m.

In some examples, the step 1.5 comprises the steps of:

1) The hose curing should turn on the indicating switch of the ultraviolet lamp on the control console first, turn on the ultraviolet lamp sequentially at the buttons 1-8 on the control console, the turn-on interval between each lamp is 30s, and finally turn on the cable reel rotary switch and its indicating switch dragging the ultraviolet lamp holder to walk;

2) The curing of the hose is started after the ultraviolet lamp is completely started, the running speed of the ultraviolet lamp is controlled, the rotating speed of the cable reel is adjusted according to different time periods, and the running speed of the ultraviolet lamp is controlled to be 0.2-0.3 m/min in the initial curing stage.

In some examples, the step 1.6 includes the steps of:

1) After the ultraviolet lamp is removed, the rope tightener and the binding head are firstly removed, and then a cutting machine is used for cutting off the redundant lining pipe after curing, wherein the cutting operation is carried out so that the lining pipe exceeds the pipe to be repaired by 20mm;

2) After cutting off the redundant lining pipe, pulling out the inner film remained in the lining pipe from the curing starting well by using a high-temperature resistant rope originally pulling a lamp holder in the lining pipe, and simultaneously pulling in another rope to enter the lining pipe;

3) After the inner membrane is pulled out, smearing a quick-setting type quick-stopping water substance in a gap between the pipe orifice of the lining and the pipe orifice to be repaired;

4) Cleaning site garbage and tools, and carrying out recovery treatment on the well chamber.

Compared with the prior art, the invention has the beneficial effects that:

1) The air bag plugging method of the invention installs rubber air bags respectively at the upstream and the downstream of the cleaning area section for plugging, cuts off all water inlet sources, controls the corresponding water level, reduces the water head pressure and improves the operation safety.

2) The invention can realize the requirement of no water or little water in the pipe by erecting the temporary drainage pipeline and pumping the water into the temporary pipeline by the water pump to be discharged into a downstream well, thereby being convenient for detecting the pipe.

3) The invention pumps the mixture of sewage and the like cleaned in the inspection well by using the sewage suction truck or the mud pump, so that the silt and the sewage cleaned by the high-pressure spray head can be continuously and smoothly discharged out of the pipeline.

4) The images automatically generated by the CCTV endoscopic system can be automatically stored on a hard disk of a computer, and data optical disks and text reports are manufactured according to the internal conditions of the pipelines, so that a construction unit and a construction party can jointly analyze and evaluate the conditions of the pipelines, the damaged or leaked parts can be accurately positioned, and scientific and visual bases are provided for future maintenance schemes.

5) The invention adopts the alkali-free glass fiber hose, after being fully impregnated by resin, the alkali-free glass fiber hose is pulled into a pipeline to be repaired from an inspection well, the hose is expanded to be round by air pressure, and a firm and smooth new lining pipe is formed after ultraviolet curing, thereby achieving the aim of repairing.

Drawings

FIG. 1 is a flow chart of a non-excavation dredging and repairing construction method for a drainage pipeline.

FIG. 2 is a schematic view of the pipeline diversion and water regulation of the present invention.

Fig. 3 is a schematic diagram of plugging and temporary drainage according to the present invention.

Fig. 4 is a schematic diagram of the collection and release of the CCTV detection device of the present invention.

FIG. 5 is a flow chart of the UV curing construction method of the present invention.

Detailed Description

Embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While embodiments of the invention are illustrated in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Persons skilled in the art may derive alternatives from the following description without departing from the spirit and scope of the invention.

Examples

A drainage pipeline non-excavation dredging and repairing construction method comprises the following steps:

1. pipeline plugging: when the upstream water flow is small and the water level in the well is low, sand bags can be used for blocking, and bricklaying blocks are used in cooperation with air bags; the pipeline plugging adopts air bag plugging, the lower air bag position of the pipeline plugging adopts 1 air bag at the upper and lower openings of the wellhead of the upper and lower stream of the pipe section to be cleaned, and stainless steel baffle walls are added at the two sides of the construction pipe section to support the plugging air bags.

2. Guiding water and lowering water in the pipeline: before pipeline construction, the pipe mouth of the starting end inspection well is plugged, a water pump and a water belt are arranged in the inspection well at the upstream of the inspection well, and water is guided to the other section of pipeline.

3. Draining water on the pipeline: the pipeline is blocked in sections, the blocking distance is 100-200m, a temporary drainage pipeline is erected, and water is pumped into the temporary pipeline by a water pump and drained into a downstream well; the pipeline plugging adopts an air bag plugging device for plugging.

4. Clearing and dredging pipelines:

(1) high-pressure cleaning: starting construction from a downstream wellhead, placing a nozzle and a hose into a pipeline, and placing a spray head at the tail end of the pipeline before turning on a pump; when the spray head is below the water surface, the construction performance of the low pressure spraying machine is greatly reduced, and therefore, the water flow in the pipeline needs to be controlled. The nozzle is sent into a pipeline to be cleaned, then sundries in the pipeline are washed into a downstream working well in the pulling-back process, the sundries are removed, and the washing efficiency interval is that the falling-back speed is controlled to be 100-200 mm/s.

(2) Sewage suction of a sewage suction truck: filling the sludge such as the cleaned sludge and garbage into a woven bag, transporting the woven bag to a designated place, and providing a waste discharge treatment place;

5. special cleaning of pipelines and cleaning of well chambers: sand and stones are deposited in the pipeline, which cannot be cleaned out by a sewage suction truck and a cleaning truck, are cleaned out by a method of manually pulling cattle by a reaming machine, and are cleaned out, bagged, abandoned and transported manually;

6. removing foreign matters in the pipeline: cutting off tree roots, cement blocks and exposed reinforcing meshes in the drainage pipeline by using milling cutters of different models; monitoring is carried out by adopting CCTV detection.

Sludge disposal and outward transportation:

1) Sludge outward transport flow: the sludge mainly comes from a drainage pipeline, the upstream sludge is diluted and washed to a downstream specified inspection well through high-pressure washing and other dredging modes in site construction, garbage, sludge, sundries and the like in the well are drained (or separated by mud and water of a sewage suction truck) and then loaded into a muck truck through a mode of combined operation of manual cleaning and fishing and mechanical mud grabbing (or sewage suction truck), dehydration treatment is carried out at a specified place, and dust raising and the like are reduced during transportation.

2) The muck transportation is carried out according to relevant regulations of local muck transportation, and vehicles with good performance, better carriage sealing and complete certificates are selected and run according to specified lines. The transport vehicle is not overloaded, the upper part of the carriage is completely covered by the tarpaulin, and the slag soil is prevented from scattering to pollute the road and the surrounding environment in the transport process.

3) And (3) preventing disorderly and disorderly abandoning measures: in order to prevent the problems of random dumping and random abandonment of the muck in the transportation process, a method of bidirectional ticket signing between an excavation site and a waste soil site is adopted in the construction process, the random dumping and random abandonment of the muck are firmly avoided, and the muck is guaranteed to be transported to a specified waste soil site.

4) And (4) environmental protection measures: in order to ensure that the environment formed around is not influenced when the dredging and muck transporting work is carried out, cleaning work is carried out in the dredging and transporting process, and a specially-assigned person is responsible for the cleaning work. In order to ensure that the vehicle transportation does not cause pollution to the environment, a service rack is arranged at an entrance and an exit of a construction site, and a specially-assigned person is arranged to clean the vehicle, so that each earth-moving vehicle can be released after being cleaned. Cleaning personnel are arranged in the slag soil transportation section to clean soil blocks and mud blocks scattered by vehicles at any time, and specially-assigned people are arranged to patrol, watch and organize intersection traffic.

Dismantling water plugging facilities:

and strictly forbidding to dismantle the two water plugging facilities at the upstream and the downstream simultaneously according to the principle of first downstream and then upstream.

Detecting a pipeline:

after the pipeline is repaired, the detection personnel immediately carry out CCTV detection on the pipeline section. Further understanding the overall condition of pipeline repair, recording carefully and submitting CCTV detection report.

Requirements for field testing:

1) In order to guarantee the detection quality, a temporary pipeline needs to be erected, an original pipeline is plugged by an air bag plugging device after the temporary pipeline is erected, and sewage in a detection section is discharged to the downstream or the upstream or to a temporary pit and depression. The temporary pipeline is planned to be erected for about 200 meters at one time, the influence on traffic is reduced, and interface leakage is reduced.

2) And cleaning the detected pipeline if necessary according to the field condition before structural detection, wherein the inner wall of the cleaned pipeline is not covered by dirt or impurities.

3) The CCTV detection can be carried out when the water level in the pipeline is not higher than 10 cm (the best state is no water). The workers who go into the well must wear portable gas detecting instruments, safety protective belts, gas masks and the like to go into the well.

4) The images automatically generated by the CCTV endoscopic system can be automatically stored on a hard disk of a computer, and data optical disks and character reports are manufactured according to the internal conditions of the pipelines, so that a construction unit and a construction party can jointly analyze and evaluate the conditions of the pipelines, the damaged or leaked parts can be accurately positioned, and scientific and visual bases are provided for future maintenance schemes.

5) And (4) according to the CCTV detection evaluation result, combining pipe network information, geographic information, traffic information, owner requirements and the like to make a pipeline repair design or scheme.

7. Trenchless repair

(1) The method comprises the steps of (1) overall repairing of a pipeline, namely ultraviolet curing repairing, wherein ultraviolet curing and UV-CIPP repairing are adopted;

the ultraviolet light curing technology UV-CIPP is one of in-situ curing methods, and is an in-situ curing method for weaving glass fiber into hose impregnating resin, then drawing the hose impregnating resin into an original pipeline, inflating and expanding the hose impregnating resin to be close to the original pipeline, and curing the resin under the action of ultraviolet light to form a lining pipe with certain strength.

The method adopts a UV resin system, the hose material is glass fiber, and the cured lining layer has high strength, is corrosion resistant and improves the water flow condition. The UV-CIPP has the following characteristics:

1) The drainage pipeline can be integrally repaired by only utilizing the inspection well without excavation, and structural defects of breakage, stagger, disjointing, tree root invasion, leakage and the like of the drainage pipeline can be repaired.

2) The inner liner is smooth and continuous, the inner liner is 3-15mm, the surface roughness of the pipeline is reduced, and the conveying capacity of the pipeline is improved.

3) The lining pipe has good substrate toughness, high strength and good fusibility with composite resin impregnation, the short-term bending modulus of the lining layer after curing can reach more than 6500MPa, the lining layer is tightly attached to the original pipeline to isolate the corrosive environment, and the effects of leaking stoppage, seepage prevention and the like are achieved.

4) Is suitable for repairing various pipelines with the pipe diameters of 150-1500 mm.

5) Short construction period (5-8 h of single-section curing repair), small environmental impact, no influence on traffic, good construction safety and the like.

6) The high-risk equipment such as a boiler and the like is not needed to be involved in construction, and the whole process is digital and can be monitored.

7) The method is completely trenchless repairing method without breaking inspection well.

(2) Ultraviolet light curing construction

1.1, detecting toxic and harmful gases in the pipeline; before entering the inspection well, constructors firstly measure toxic and harmful gases (H2S, CH4, CO and the like) in the pipeline, and when the toxic and harmful gases reach the safety standard, the constructors can go down the well for operation; when the toxic and harmful gas is higher than the safety standard, personnel can not be arranged to carry out the well descending operation. When people go down the well, forced ventilation measures must be taken, the people must be tied with safety ropes, at least one person at the well head monitors the safety ropes, otherwise, the people cannot go down the well for operation.

1.2, dragging into a bottom film: and after the pipeline dredging detection is finished, laying a basement membrane, firstly placing a basement membrane roll support on a well mouth of the curing well, and then placing a basement membrane roll on the support. Stay in intraductal rope with when detecting and tie up basement membrane one end and another rope one end, pull basement membrane and subsidiary rope side by side together to the solidification start well. The laid basement membrane is arranged at the bottom of the original pipeline. The length of the bottom film is controlled to be about 800mm beyond the tail end of the pipeline to be repaired, and the rest part is cut off.

1.3, pulling-in CIPP liner hose:

1) Before the hose enters the pipeline to be repaired, a rope pulled in along with the bottom film in the pipeline is used for pulling a steel wire rope of the winch to the other end of the pipeline to be repaired;

2) Before the hose enters the pipeline to be repaired, rollers or fixed pulleys are arranged at all the wellhead and pipe orifice positions of the pipeline, which change the direction, of the hose entering the pipeline, the rollers or the fixed pulleys are fixed by using a lead screw, and the hose is directly contacted with other objects to be repaired by arranging a liner plastic cloth;

3) The hose is connected with a traction steel wire rope of a winch, the two sides of one end of the hose are folded inwards by one third respectively, then a hoisting belt is placed at the bottom of the folding line and then the hose is folded by 0.4-0.5 m in a longitudinal mode, then the end part of the hose is fastened by a binding belt, the end part of the hose before fastening is provided with a protective bottom film, and finally a universal U-shaped hoisting ring is used for connecting the hoisting belt with a steel wire rope sleeve of the winch;

4) Starting a winch to pull the hose into the pipeline to be repaired, wherein the winch is kept to be smoothly connected with personnel in the hose section, and the pulling speed is controlled within 0.6 m/s;

5) When the length of the outer hose of the wellhead is close to the depth of the well, the winch is stopped, the tail of the hose and the rope are tightened by the binding belt, then counter force is applied, and the winch is started again to pull the hose until the front end of the hose exceeds the pipeline to be repaired by 0.5 m.

1.4, installing a binding head, and placing a lamp bracket:

1) The binding heads are respectively arranged at two ends of the hose. Before the binding head is installed, tubular binding head cloth matched with the specification of the hose is installed outside the two ends of the hose, and preparation work for inserting the binding head and replacing the special black high-temperature-resistant rope with the white replacement rope in the hose is required.

2) Before the ultraviolet lamps enter the hose, the number of the ultraviolet lamps and the specification of the lamps are determined according to the inner diameter of the pipeline to be repaired, and the assembly, connection and adjustment of the ultraviolet lamps, the ultraviolet lamp holder, the lamp holder wheels, the cables of the lamp holder and the black high-temperature-resistant ropes for drawing the lamp holder are completed.

1.5, curing the hose:

1) The hose curing is to turn on an indicating switch of an ultraviolet lamp on a control console, turn on the ultraviolet lamp sequentially by buttons 1-8 on the control console, the turn-on interval between each lamp is 30s, and finally turn on a cable reel rotary switch and an indicating switch thereof dragging an ultraviolet lamp bracket to move;

2) The hose is cured after the ultraviolet lamp is completely started, the running speed of the ultraviolet lamp is controlled, the rotating speed of the cable reel is adjusted according to different time periods, and the running speed of the ultraviolet lamp is controlled to be 0.2-0.3 m/min in the initial curing stage.

1.6, post-processing:

1) After the ultraviolet lamp is removed, the rope tightener and the binding head are firstly removed, and then a cutting machine is used for cutting off the redundant lining pipe after curing, wherein the cutting operation is carried out so that the lining pipe exceeds the pipe to be repaired by 20mm;

2) After cutting off the redundant lining pipe, pulling out the inner film remained in the lining pipe from the curing starting well by using a high-temperature resistant rope of the original traction lamp bracket in the lining pipe, and simultaneously pulling in another rope to enter the lining pipe;

3) After the inner membrane is pulled out, smearing a quick-setting type quick-stopping water substance in a gap between the pipe orifice of the lining and the pipe orifice to be repaired;

4) Cleaning field garbage and tools, and carrying out recovery treatment on the well chamber.

1.7, and checking and accepting the repaired UV-CIPP lining.

The principle of the repair method by the dotted in-situ curing method is as follows:

the in-situ curing spot repairing technology for underground pipeline is also called local resin curing method. The method is characterized in that a special pipeline repairing air bag expansion method is adopted at an original pipeline to-be-repaired position, glass fiber fabrics evenly impregnated with curable resin are tightly attached to the pipeline repairing position, and after the glass fiber fabrics are cured at normal temperature, a local short pipe lining is formed.

In-situ curing spot repair construction process of underground pipelines:

1) Coating protective film

A polyethylene PE protective film with the thickness of 0.5mm is covered on the surface of the repair air bag, the protective film is required to be completely covered, omission is avoided, and the repair material is prevented from being stuck on the air bag.

2) Dispensing repair resin

And respectively measuring the A/B component resin by adopting a measuring cup according to the volume ratio of 1. The volume of resin is required to be sufficient to fill the entire space of the nominal thickness and diameter of the glass fiber cloth hose

3) Stirring the resin

After the resin components are post-mixed, they must be rapidly and uniformly stirred, and stirring with an electric stirring tool is recommended.

4) Coating resin

And uniformly coating the resin mixed solution on the glass fiber cloth by adopting a scraper, and folding to enable the repair material to reach the designed thickness. The resin is required to be applied once per fold to ensure that the resin has completely impregnated the fiberglass cloth.

5) Repair material positioning installation

The repair material is installed within the indicated range of positions on the repair balloon to prevent it from slipping or falling off. It is recommended to flush a small amount of gas slightly into the air bag before installation to allow it to swell slightly.

6) Anti-drop protection

The repair material is bound by an adhesive tape or a thin iron wire, so that the material is prevented from falling or sliding in the process of entering the pipeline, and the binding material is required to have proper strength to be capable of firmly binding the material and be broken by the inflated silica gel sleeve.

7) The repairing air bag is sent to the position to be repaired:

and pushing the repairing air bag wrapped with the repairing material into the pipe section to be repaired, and monitoring the position of the repairing equipment in real time by using a crawler at the front end. The repair material is required not to slip or fall off the lamp holder and should not contact the edge of the pipe orifice when being fed into the pipe.

8) Inflation

And opening the inflation valve to inflate the air bag so that the repair material is tightly attached to the pipe wall. The inflation pressure is required to be strictly in accordance with the pressure indicated by the airbag manufacturer.

9) Curing

And (4) keeping the air pressure in the air bag, waiting for more than 45 minutes, and taking out the air pressure in the air bag to restore the air bag after the material is completely cured.

10 Dot-like partial repair method illustration.

Construction example

A drainage pipe network rain and sewage diversion reconstruction project in Taian city-Mingtang river partition design range: north to the mountain, south to taixin high speed, east to bosyang, west to tianzifeng and live in the two districts of shang cheng city and yang village. Total service area 29.1km ² (not including western sides of Tianzhufeng roads, mingtang roads and Mingtang river governance). Wherein various rain and sewage pipelines are newly built for about 12.6km; and dredging and repairing the pipeline (channel) for about 25.85km, wherein the dredging is about 21.15km, and the repairing is about 4.7km.

The construction method is applied to the unit, according to the actual situation of the site, under the conditions of short construction period and heavy task, the construction is reasonably organized and elaborately carried out, and the expected target is obtained.

The above description is only for the specific embodiments of the present disclosure, but the scope of the embodiments of the present disclosure is not limited thereto, and any person skilled in the art can easily conceive of changes, substitutions or combinations within the technical scope of the embodiments of the present disclosure or under the spirit of the embodiments of the present disclosure, and all such changes, substitutions or combinations are included in the scope of the embodiments of the present disclosure.

Claims (7)

1. A drainage pipeline non-excavation dredging and repairing construction method is characterized by comprising the following steps:

1) Pipeline plugging: when the upstream water flow is small and the water level in the well is low, sand bags can be used for blocking, and bricklaying blocks are used in cooperation with air bags;

2) Guiding water and lowering water in the pipeline: before pipeline construction, plugging the pipe orifice of an initial end inspection well, arranging a water pump and a water belt in the inspection well upstream of the inspection well, and guiding water to the other section of pipeline;

3) Draining water on the pipeline: the pipeline is blocked in sections, the blocking distance is 100-200m, a temporary drainage pipeline is erected, and water is pumped into the temporary pipeline by a water pump and drained into a downstream well;

4) Clearing and dredging pipelines:

(1) high-pressure cleaning: starting construction from a downstream wellhead, placing a nozzle and a hose into a pipeline, and placing a spray head at the tail end of the pipeline before turning on a pump;

(2) sewage suction of a sewage suction truck: filling the sludge such as the cleaned sludge and garbage into a woven bag, transporting the woven bag to a designated place, and providing a waste discharge treatment place;

5) Special cleaning of pipelines and cleaning of well chambers: sand and stones are deposited in the pipeline, which cannot be cleaned out by a sewage suction truck and a cleaning truck, are cleaned out by a method of manually pulling cattle by a reaming machine, and are cleaned out, bagged, abandoned and transported manually;

6) Removing foreign matters in the pipeline: cutting off tree roots, cement blocks and exposed reinforcing meshes in the drainage pipeline by using milling cutters of different types;

7) Trenchless repair

(1) The method comprises the steps of (1) overall repairing of a pipeline, namely ultraviolet curing repairing, wherein ultraviolet curing and UV-CIPP repairing are adopted;

(2) ultraviolet light curing construction

1.1, detecting toxic and harmful gases in the pipeline;

1.2, dragging into a basement membrane;

1.3, pulling in a CIPP lining hose;

1.4, installing a binding head and placing the binding head into a lamp holder;

1.5, curing the hose;

1.6, post-processing;

1.7, and checking and accepting the repaired UV-CIPP lining.

2. The trenchless dredging and repairing construction method for the drainage pipeline according to claim 1, wherein the pipeline plugging in the step 1) adopts air bag plugging, the lower air bag of the pipeline plugging is respectively plugged at the upper and lower openings of the wellheads at the upstream and downstream of the pipeline section to be cleaned, and stainless steel baffle walls are additionally arranged at two sides of the pipeline section to support the plugging air bags.

3. The trenchless dredging and repairing construction method for the drainage pipeline according to claim 1, wherein the pipeline plugging in the step 3) is performed by plugging with an air bag plugging device.

4. The trenchless dredging and repairing construction method for the drainage pipeline according to claim 1, wherein the flushing efficiency interval in the step (1) of dredging the pipeline is controlled to be 100-200 mm/s of backward speed.

5. The trenchless dredging and repairing construction method for the drainage pipeline according to claim 1, wherein the step 1.3 comprises the following steps:

1) Before the hose enters the pipeline to be repaired, a rope pulled in the pipeline along with the bottom film is used for pulling a steel wire rope of the winch to the other end of the pipeline to be repaired;

2) Before the hose enters the pipeline to be repaired, rollers or fixed pulleys are arranged at all direction-changing well mouths and pipe orifices of the pipeline where the hose enters the pipeline, the rollers or the fixed pulleys are fixed by using a lead screw, and the hose is directly contacted with other objects to be repaired to be provided with a liner plastic cloth;

3) The hose is connected with a traction steel wire rope of a winch, two sides of one end of the hose are folded inwards by one third respectively, a hoisting belt is placed at the bottom of the folding line and then the hose is longitudinally folded by 0.4-0.5 m, then the end part of the hose is fastened by a binding belt, a protective bottom film is arranged at the end part before fastening, and finally a universal U-shaped hoisting ring is used for connecting the hoisting belt with a steel wire rope sleeve of the winch;

4) Starting the winch to pull the hose into the pipeline to be repaired, wherein the connection between the winch and personnel at the hose section is kept smooth, and the pulling speed is controlled within 0.6 m/s;

5) When the length of the outer hose of the wellhead is close to the depth of the well, the winch is stopped, the tail of the hose and the rope are tightened by the binding belt, then counter force is applied, and the winch is started again to pull the hose until the front end of the hose exceeds the pipeline to be repaired by 0.5 m.

6. The trenchless dredging and repairing construction method for the drainage pipeline according to claim 1, wherein the step 1.5 comprises the following steps:

1) The hose curing should turn on the indicating switch of the ultraviolet lamp on the control console first, turn on the ultraviolet lamp sequentially at the buttons 1-8 on the control console, the turn-on interval between each lamp is 30s, and finally turn on the cable reel rotary switch and its indicating switch dragging the ultraviolet lamp holder to walk;

2) The curing of the hose is started after the ultraviolet lamp is completely started, the running speed of the ultraviolet lamp is controlled, the rotating speed of the cable reel is adjusted according to different time periods, and the running speed of the ultraviolet lamp is controlled to be 0.2-0.3 m/min in the initial curing stage.

7. The trenchless dredging and repairing construction method for the drainage pipeline according to claim 1, wherein the step 1.6 comprises the following steps:

1) In the post-treatment after the ultraviolet lamp is removed, the rope tightener and the binding head are firstly removed, and then a cutting machine is used for cutting off the redundant lining pipe after curing, wherein the cutting operation is carried out to ensure that the lining pipe exceeds the pipe to be repaired by 20mm;

2) After cutting off the redundant lining pipe, pulling out the inner film remained in the lining pipe from the curing starting well by using a high-temperature resistant rope originally pulling a lamp holder in the lining pipe, and simultaneously pulling in another rope to enter the lining pipe;

3) After the inner membrane is pulled out, smearing a quick-setting type quick-stopping water substance in a gap between the pipe orifice of the lining and the pipe orifice to be repaired;

4) Cleaning site garbage and tools, and carrying out recovery treatment on the well chamber.

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