CN107178675B - Method and device for realizing replacement of pipe section or valve without stopping water on water supply pipeline - Google Patents

Method and device for realizing replacement of pipe section or valve without stopping water on water supply pipeline Download PDF

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Publication number
CN107178675B
CN107178675B CN201710458783.1A CN201710458783A CN107178675B CN 107178675 B CN107178675 B CN 107178675B CN 201710458783 A CN201710458783 A CN 201710458783A CN 107178675 B CN107178675 B CN 107178675B
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pipeline
pipe fitting
pipe
valve
sealed cabin
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CN107178675A (en
Inventor
吕世刚
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Shenzhen Water Technology Service Co ltd
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Shenzhen Water Technology Service Co ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
    • F16L55/1608—Devices for covering leaks in pipes or hoses, e.g. hose-menders by replacement of the damaged part of the pipe
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L23/00—Flanged joints
    • F16L23/02—Flanged joints the flanges being connected by members tensioned axially
    • F16L23/024—Flanged joints the flanges being connected by members tensioned axially characterised by how the flanges are joined to, or form an extension of, the pipes
    • F16L23/026—Flanged joints the flanges being connected by members tensioned axially characterised by how the flanges are joined to, or form an extension of, the pipes by welding
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L23/00—Flanged joints
    • F16L23/02—Flanged joints the flanges being connected by members tensioned axially
    • F16L23/032—Flanged joints the flanges being connected by members tensioned axially characterised by the shape or composition of the flanges
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/20—Hydro energy

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pipe Accessories (AREA)
  • Branch Pipes, Bends, And The Like (AREA)

Abstract

The invention provides a method and a device for realizing replacement of a pipe section or a valve on a water supply pipeline without stopping water, wherein the method comprises the following steps: installing a pipeline flange plate and a pipeline cutting beveling machine at two sides of a pipeline or a valve to be replaced, installing a pipeline sealing cabin, enabling the pipeline or the valve to be replaced to be positioned in a lower sealing cabin of the pipeline sealing cabin, cutting and beveling the pipeline to be replaced, and taking out the pipeline to be replaced and the pipeline cutting beveling machine; and (3) placing the connecting pipe fitting into the upper sealed cabin, enabling the two ends of the connecting pipe fitting to be connected with the pipeline flanges on the two sides of the pipeline respectively, removing the pipeline sealed cabin under the continuous action of the connecting pipe fitting and the pipeline flanges, and fixing the two ends of the connecting pipe fitting with the pipeline flanges on the two sides respectively. By adopting the technical scheme of the invention, the replacement of the partial pipe section or the valve without stopping water is realized, and the method can ensure uninterrupted water supply and can not open the original water supply pipeline or damage other upper structures.

Description

Method and device for realizing replacement of pipe section or valve without stopping water on water supply pipeline
Technical Field
The invention belongs to the technical field of pipeline maintenance, and particularly relates to a method and a device for replacing a pipeline section or a valve on a water supply pipeline without stopping water.
Background
The water supply pipe network is newly built, move and change the pipeline in the engineering and bump the mouth or the change of valve on the water supply pipe, also sample the detection to the tubular product on the operation water supply pipe, all can't avoid stopping water to the water supply pipe network. If the valve is not tightly closed, the water stopping range is enlarged, the water stopping time is overlong, no water is available to users, and the production of water plants is seriously influenced, so that bad social influence is caused on water plants, and even direct economic losses of residents and production enterprises are caused; if the operation is improper in the water stopping operation and the construction process, or the pipeline in the water stopping range cannot be effectively flushed when water is recovered, a certain water quality potential safety hazard is brought, and the operation for recovering water is more difficult and complicated when the water stopping pipe diameter is larger and the water stopping range is larger.
With the continuous improvement of the requirements of residents and production enterprises on water supply, from the perspective of water supply enterprise water supply stopping operation, if the water supply stopping range is minimum, the time is shortest, the water stopping scheme is optimal, little water stopping is carried out, and even no water stopping is carried out, the working efficiency and the social service quality of the water supply enterprises are greatly improved.
The existing method for replacing the partial pipe section or the valve without stopping water is as follows: through the mode of the opening without stopping water, the two sides of the pipe section and the valve to be replaced are opened and connected through the pipeline, the air bags extend into the positions of the openings, water blocking is carried out on the two sides of the part to be replaced, water diversion is carried out through the temporary connecting pipeline, and the temporary connecting pipeline is removed after the pipe section and the valve are replaced. The theoretical method damages the pipeline, a pipeline tee joint is reserved on two sides of the replaced pipeline section and the valve respectively, and in the method, the air bag has risks in overcoming the problems of water pressure and the like, and the method has the advantages of larger required operation space, higher cost and extremely large realization difficulty.
Disclosure of Invention
Aiming at the technical problems, the invention discloses a method and a device for replacing a pipe section or a valve on a water supply pipeline without stopping water, which can replace the pipe section or the valve on the water supply pipeline without stopping water and can not open the original water supply pipeline or damage other upper structures. In addition, the connecting pipe fitting can overcome the problems of out-of-roundness and borrowing angle in a certain range of the original pipeline, further ensure the replacement and continuous process, realize the reversible operation of dismounting the connecting pipe fitting and facilitate the replacement of pipe sections and valves again.
In this regard, the invention adopts the following technical scheme:
a method of effecting replacement of a pipe segment or valve on a water supply pipe without stopping water, comprising the steps of:
step S1, installing pipeline flanges on two sides of a pipeline or a valve to be replaced, arranging two pipeline cutting beveling machines between the pipeline flanges, and enabling the pipeline cutting beveling machines to be respectively positioned on the inner sides of the pipeline flanges on the two sides;
s2, installing a pipeline sealed cabin at a pipeline or a valve to be replaced, wherein the pipeline sealed cabin is in sealing connection with a water supply pipeline; the pipeline sealed cabin is divided into an upper sealed cabin and a lower sealed cabin through a gate valve, and the water supply pipeline passes through the lower sealed cabin and is positioned in the lower sealed cabin by a pipeline flange plate and a pipeline cutting beveling machine; installing a lifting member on a pipeline or a valve to be replaced; the lower sealed cabin is provided with a water outlet; the top of the upper sealed cabin is provided with a sealed cabin cover plate, the sealed cabin cover plate is provided with a pipeline hoisting rope, the outer side of the sealed cabin cover plate is provided with a hoisting device connected with the pipeline hoisting rope, and the hoisting device is connected with a hoisting member through the pipeline hoisting rope; the sealing cabin cover plate is provided with a power line penetrating hole for introducing a power line to provide driving force for a pipeline cutting beveling machine or a (hydraulic or pneumatic) jack.
Step S3, starting a pipeline cutting beveling machine on one side, cutting one side of a pipeline, and beveling the pipeline after cutting is completed;
s4, starting a pipeline cutting beveling machine at the other side to cut and bevel;
s5, lifting the replaced pipeline or valve to be above the gate valve through a lifting device, enabling the pipeline or valve to be positioned in the upper sealed cabin, and closing the gate valve; opening a sealing cabin cover plate, and taking out the pipe section and the pipeline cutting beveling machine;
s6, placing a connecting pipe fitting into the upper sealed cabin, wherein two ends of the connecting pipe fitting comprise a connecting interface and a limiting member corresponding to the pipeline flange plate, and the connecting pipe fitting comprises a first pipe fitting and a second pipe fitting; one end of the second pipe fitting is sleeved into the first pipe fitting and is in sliding connection with the first pipe fitting, a driving mechanism for enabling the first pipe fitting to slide relative to the second pipe fitting is arranged between the first pipe fitting and the second pipe fitting, the driving mechanism is an air pressure or hydraulic jack, and further, the driving mechanism is an air pressure or hydraulic synchronous jack; closing a sealing cabin cover plate, opening a gate valve, placing the connecting pipe fitting at an installation position through a lifting device, and opening a driving mechanism to enable the first pipe fitting to slide relative to the second pipe fitting, and enabling two ends of the connecting pipe fitting to be connected with pipeline flanges on two sides respectively; and removing the pipeline sealed cabin under the action force of the retaining driving mechanism, and fixing the two ends of the connecting pipe fitting with the pipeline flanges on the two sides respectively. The connecting interfaces of the connecting pipe fitting and the pipeline flange plate are pipe fitting flange plates.
As a further improvement of the invention, before starting the pipeline cutting beveling machine at one side, the water is injected into the pipeline sealing cabin in step S3, so that the water pressure in the pipeline sealing cabin is close to the water supply pressure of the water supply pipeline.
As a further improvement of the present invention, after step S6, welding the connection between the first pipe and the second pipe is further included.
As a further improvement of the invention, the step S6 further comprises the step of fixedly connecting the first pipe fitting and the second pipe fitting, namely, after the first pipe fitting and the second pipe fitting slide and are respectively fixed with the pipeline flanges on two sides, fixedly connecting the first pipe fitting and the second pipe fitting through bolts.
As a further development of the invention, the pipe seal compartment is sealed with the water supply pipe by means of a rubber ring or by means of a welded connection by means of a transition pipe.
As a further improvement of the present invention, in step S3 and step S4, when the pipe cutting gap is generated, the drain port of the pipe seal chamber is opened, the scrap iron is discharged, and the drain port is closed.
As a further improvement of the invention, in step S3, after cutting the single side of the pipe, the pipe or the valve to be replaced is pulled by a lifting device.
As a further improvement of the invention, the method further comprises polishing, cleaning and disinfecting the outer surfaces of the pipe section to be replaced and the peripheral pipeline before the step S1.
As a further improvement of the invention, the opening part of the first pipe fitting is provided with a first sealing ring, the tail part of the second pipe fitting is provided with a second sealing ring, the pipe wall of the second pipe fitting sleeved in the first pipe fitting is provided with a third sealing ring, and the third sealing ring is positioned between the tail part of the first pipe fitting and the opening part of the second pipe fitting. Preferably, a retainer ring is arranged at the opening of the second pipe fitting, and a third sealing ring is arranged between the retainer ring and the tail part of the first pipe fitting.
Preferably, the sum of the thicknesses of the first sealing ring and the second sealing ring is not greater than the thickness of the third sealing ring.
As a further improvement of the invention, when the sealing ring is not added, the maximum distance between the first pipe fitting and the second pipe fitting after relative sliding can be larger than the distance between the pipeline flanges, can be equal to the distance between the pipeline flanges, and can be slightly smaller than the distance between the pipeline flanges. When the maximum distance between the first pipe fitting and the second pipe fitting after relative sliding can be larger than the distance between the pipeline flanges, the thickness of the third sealing ring is larger than the sum of the thicknesses of the first sealing ring and the second sealing ring. If the maximum distance between the first pipe fitting and the second pipe fitting after relative sliding is equal to the distance between the pipeline flanges, the thickness of the third sealing ring is equal to the sum of the thicknesses of the first sealing ring and the second sealing ring. If the maximum distance between the first pipe fitting and the second pipe fitting after relative sliding is smaller than the distance between the pipeline flanges, the thickness of the third sealing ring is smaller than the sum of the thicknesses of the first sealing ring and the second sealing ring.
As a further improvement of the invention, the tail part of the first pipe fitting is provided with a first pipe fitting flange, the tail part of the second pipe fitting is provided with a second pipe fitting flange, when two ends of the connecting pipe fitting are respectively connected with the pipe flanges on two sides, one side of the third sealing ring is contacted with the check ring, and the other side is contacted with the inner wall of the first pipe fitting flange.
As a further improvement of the invention, when the two ends of the connecting pipe fitting are respectively connected with the pipeline flanges on the two sides, the first pipe fitting flange is connected with the pipeline flange close to the first pipe fitting flange, and the second pipe fitting flange is connected with the pipeline flange close to the second pipe fitting flange. Preferably, the first pipe flange is connected with the adjacent pipe flange through bolts, and the first pipe flange is connected with the adjacent pipe flange through bolts.
Preferably, the first pipe flange is connected with the check ring through bolts.
As a further improvement of the invention, the inner diameter of the two ends of the connecting pipe is larger than the outer diameter of the original water supply pipeline.
The invention also provides a device for realizing the replacement of the pipe section or the valve without stopping water on the water supply pipeline, which comprises a connecting pipe fitting, wherein the inner diameter of the two ends of the connecting pipe fitting is not smaller than the outer diameter of the original water supply pipeline; the connecting pipe fitting comprises a first pipe fitting, a second pipe fitting and a limiting member, one end of the second pipe fitting is sleeved in the first pipe fitting, the first pipe fitting and the second pipe fitting are connected in a sliding mode, and the structure of the limiting member is matched with a pipeline flange plate; and the connecting pipe fitting is provided with a hanging ring. The inner diameters of the two ends of the connecting pipe fitting are not smaller than the outer diameter of the original water supply pipe, and because after the pipe is cut into grooves, a certain margin is reserved on the inner side of the pipe flange welded on the pipe, namely the pipe cannot be cut with the flange, the inner diameters of the two ends of the connecting pipe fitting are larger than the outer diameter of the original water supply pipe, and the second effect of the inner diameter ratio is to overcome the out-of-roundness and the angle borrowing problems of the original pipe. The method for replacing the pipe section or the valve without stopping water on the water supply pipeline is adopted.
As a further improvement of the invention, the opening of the second pipe fitting is provided with a check ring, the opening of the first pipe fitting is provided with a first sealing ring, the tail part of the second pipe fitting is provided with a second sealing ring, and a third sealing ring is arranged between the check ring and the tail part of the first pipe fitting; the sum of the thicknesses of the first sealing ring and the second sealing ring is the same as the thickness of the third sealing ring; the total length of the first pipe fitting and the second pipe fitting after sliding is equal to the distance between the inner sides of two pipeline flanges arranged on the pipeline.
As a further improvement of the invention, the device for realizing the replacement of the pipe section or the valve without stopping water on the water supply pipeline comprises a pipeline sealed cabin, wherein the pipeline sealed cabin is in sealed connection with the water supply pipeline; the pipeline sealed cabin is divided into an upper sealed cabin and a lower sealed cabin through a gate valve, and the water supply pipeline passes through the lower sealed cabin; the upper sealed cabin is connected with the lower sealed cabin through an upper cabin connecting pipe and a lower cabin connecting pipe; and a water outlet is arranged at the lower part of the pipeline sealed cabin.
Preferably, the upper sealed cabin and the lower sealed cabin are both provided with water outlets.
Furthermore, the pipeline sealed cabin and the water supply pipeline are sealed through a rubber ring or welded through a transition pipe fitting.
Further, a visual flange window is arranged on the pipeline sealed cabin; convenient observation, convenient observation in the time of the hoist and mount, simultaneously the installation is connected the pipe fitting, convenient observation position.
Further, a water outlet is arranged at the bottom of the pipeline sealed cabin.
Furthermore, a lifting hand wheel is further arranged at the top of the pipeline sealed cabin.
As a further improvement of the invention, the upper part of the pipeline sealed cabin is provided with a water injection pressure test port and an exhaust port.
Further, a sealed cabin cover plate is arranged at the top of the upper sealed cabin, and a power line penetrating hole is formed in the sealed cabin cover plate.
Furthermore, the lower part of the pipeline sealed cabin is provided with a positioning screw rod and a positioning hand wheel.
Further, the upper cabin connecting pipe and the lower cabin connecting pipe are provided with ball valves.
Compared with the prior art, the invention has the beneficial effects that:
according to the technical scheme, the pipeline underwater operation cutting beveling machine is adopted, the special-designed connecting pipe fitting is adopted, the replacement of a partial pipe section or a valve without stopping water is realized in the pipeline sealed cabin by mechanical means, and the method can not open an original water supply pipeline or damage other upper structures while guaranteeing uninterrupted water supply, so that the efficiency is improved, and the cost is reduced. If the pipe section is replaced longer, or facilities such as a valve are replaced, only the sealed cabin with the corresponding length is customized, and the special connecting pipe fitting is connected with the valve. The invention is suitable for replacing the partial pipe section when water is stopped; old pipeline facilities such as valves or replacement valves are additionally arranged without stopping water; the pipeline is not cut off the water opening, similar to the replacement of a local pipe section without cutting off the water, a new pipe fitting is customized into a pipeline tee joint, and a valve is additionally arranged; a temporary pipeline blocking plate is additionally arranged without stopping water. And the reverse operation is conveniently realized, so that the replacement of the pipe section and the valve is convenient to be carried out again.
Drawings
Fig. 1 is a perspective view of a connecting tube according to an embodiment of the present invention.
Fig. 2 is a front view of a connecting tube according to an embodiment of the present invention.
Fig. 3 is a side view of a connecting tube according to one embodiment of the invention.
Fig. 4 is a cross-sectional view in the direction I-I of fig. 2.
FIG. 5 is a cross-sectional view taken along the direction II-II of FIG. 4.
Fig. 6 is a schematic structural view of a pipe seal box according to an embodiment of the present invention.
Fig. 7 is a schematic view of a machine for installing a pipe flange and pipe cutting and beveling in accordance with one embodiment of the present invention.
Fig. 8 is a schematic view of a connecting pipe fitting installation jack according to an embodiment of the present invention.
Fig. 9 is a schematic view of a structure of a connection pipe according to an embodiment of the present invention when the connection pipe is inserted.
Fig. 10 is a schematic view of a connection pipe fitting and a pipe flange according to an embodiment of the present invention.
The reference numerals include: 1-connecting pipe fittings, 11-first pipe fittings, 12-second pipe fittings, 13-limiting members, 14-hanging rings, 15-retainer rings, 16-first sealing rings, 17-second sealing rings, 18-third sealing rings, 19-pipe fitting flanges, 191-first pipe fitting flanges and 192-second pipe fitting flanges; the device comprises a 2-pipeline sealed cabin, a 21-upper sealed cabin, a 22-lower sealed cabin, a 23-water outlet, a 24-visible flange window, a 25-lifting hand wheel, a 26-water injection pressure test port, a 27-air outlet, a 28-positioning screw, a 29-positioning hand wheel, a 30-sealed cabin top cover plate, a 31-upper and lower cabin connecting pipe, a 3-pipeline flange plate, a 4-pipeline cutting beveling machine, a 41-blade assembly, a 5-power line interface, a 6-pipeline lifting ring, a 7-jack, an 8-gate valve, a 9-power line penetrating port and a 100-pipeline.
Detailed Description
Preferred embodiments of the present invention are described in further detail below.
The device for realizing the replacement of the pipe section or the valve without stopping water on the water supply pipeline comprises a special connecting pipe fitting 1, a pipeline sealing cabin 2 and other equipment and components, as shown in fig. 1-10, and is described one by one below.
1. Connecting pipe fitting
The connecting pipe fitting 1 is a core component for replacing a pipe section and a valve without stopping water, and the inner diameters of the two ends of the connecting pipe fitting 1 are larger than the outer diameter of the original pipeline 100, so that the pipeline connection requirement can be met under the condition that the original pipeline 100 has certain non-roundness and borrowing rotation angle.
As shown in fig. 1 to 5, the inner diameter of the two ends of the connecting pipe fitting 1 is not smaller than the outer diameter of the original water supply pipeline 100; the connecting pipe fitting 1 comprises a first pipe fitting 11, a second pipe fitting 12, a limiting member 13 and a hanging ring 14, one end of the second pipe fitting 12 is sleeved in the first pipe fitting 11, the first pipe fitting 11 and the second pipe fitting 12 are connected in a sliding manner, and the structure of the limiting member 13 is matched with the pipeline flange 3; the connecting pipe fitting 1 is provided with a hanging ring 14. The longest length of the first pipe fitting 11 and the second pipe fitting 12 after sliding is equal to the distance between the pipeline flange plates 3, a retainer ring 15 is arranged at the opening of the second pipe fitting 12, a first sealing ring 16 is arranged at the opening of the first pipe fitting 11, a second sealing ring 17 is arranged at the tail of the second pipe fitting 12, and a third sealing ring 18 is arranged between the retainer ring 15 and the tail of the first pipe fitting 11; the sum of the thicknesses of the first sealing ring 16 and the second sealing ring 17 is the same as the thickness of the third sealing ring 18; preferably, the first sealing ring 16, the second sealing ring 17 and the third sealing ring 18 are respectively connected with the connecting pipe fitting 1 by adopting an adhesive bonding or a firmer connection mode. The limiting members 13 are respectively arranged on the front part of the first pipe fitting 11 and the tail part of the second pipe fitting 12. The stop member 13 acts to engage the welded pipe flange 3 on the pipe 100 when the connection fitting 1 is docked with the pipe 100 to ensure bolt hole alignment. The lifting ring 14 is used for installing, lifting and transporting the connecting pipe fitting 1. The tail parts of the first pipe fitting 11 and the second pipe fitting 12 are respectively provided with a pipe fitting flange 19. The positions of the fixing holes on the pipe flange 19 correspond to the positions of the fixing holes on the pipe flange 3 on the corresponding side. The tail of the first pipe fitting 11 is provided with a first pipe fitting flange 191, and the tail of the second pipe fitting 12 is provided with a second pipe fitting flange 192.
2. Pipeline sealed cabin 2
As shown in fig. 6, the pipeline sealing cabin 2 is an operation main body for replacing pipe sections and valves without stopping water, and has the function of wrapping the position to be replaced of the pipeline 100 in the pipeline sealing cabin 2 and realizing cutting and connecting work of the pipeline 100 in the cabin through operation outside the cabin. The sealing cabin 2 of the pipeline and the pipeline 100 are sealed by adopting rubber rings, or welded by utilizing transition pipe fittings so as to ensure the connection strength. The specific explanation about the capsule is as follows:
the pipeline sealed cabin 2 is divided into an upper sealed cabin 21 and a lower sealed cabin 22 through a gate valve 8, and the strength of the gate valve 8 meets the corresponding thickness and pressure-bearing requirements according to specific length and width dimensions. The pipe 100 passes through the lower capsule 22; the upper sealed cabin 21 and the lower sealed cabin 22 are connected through an upper cabin connecting pipe 31 and a lower cabin connecting pipe 31, and the upper cabin connecting pipe 31 and the lower cabin connecting pipe are controlled through ball valves, so that water injection of a new pipe fitting into the front upper cabin and water pressure balance of the upper sealed cabin 21 and the lower sealed cabin 22 are facilitated, smooth opening of the gate valve 8 is ensured, and the gate valve 8 cannot be opened due to a large water pressure difference between the upper sealed cabin 21 and the lower sealed cabin 22.
The bottom of the pipe capsule 2 is provided with a drain opening 23 which serves to drain scrap iron and other drainage requirements from the cutting of the pipe 100. The pipeline sealed cabin 2 is sealed with the pipeline 100 through a rubber ring seal or through a transition pipe fitting in a welding mode.
A visual flange window 24 is arranged on the pipeline sealed cabin 2; the visible flange window 24 is made of transparent pressure-resistant materials such as quartz glass, and is mounted on the pipeline sealed cabin 2 by being pressed under the flange piece. The window is arranged on the sealed cabin to be beneficial to observing the cutting position of the pipeline 100 and the connecting position of the pipeline 100.
The lower part of the pipe seal cabin 2 is provided with a water outlet 23 which is used for discharging scrap iron and other water discharge requirements generated by pipe cutting. The top of the pipeline sealed cabin 2 is provided with a sealed cabin top cover plate 30. And a lifting hand wheel 25 is further arranged on the sealing cabin top cover plate 30, the lifting hand wheel 25 is connected with a rope below the sealing cabin top cover plate 30 and is used for lifting the cut pipe section and the new pipe fitting, and a screw rod of the lifting hand wheel is used for driving pulley-like components in the cabin through gears. The upper part of the pipeline sealed cabin 2 is provided with a water injection pressure test port 26 and an exhaust port 27, the sealed cabin cover plate 30 is provided with a power line penetrating hole 9, and the water injection pressure test port 26 of the pipeline sealed cabin 2 can also be connected with a pressure gauge to monitor the water pressure in the sealed cabin.
The lower part of the pipeline sealed cabin 2 is provided with a positioning screw 28 and a positioning hand wheel 29, the principle of the positioning screw is similar to that of a rising stem valve, and the screw can enter and exit the pipeline sealed cabin 2 through the rotation of the hand wheel, so that the cut pipeline 100 can be lifted smoothly and new pipe fittings can be put in smoothly under the condition of water flow disturbance.
3. Apparatus and fittings for mounting on pipes
As shown in fig. 7, the pipeline cutting and beveling machine comprises pipeline flanges 3, a pipeline cutting and beveling machine 4, a power line connector 5 and pipeline hanging rings 6, wherein the total number of the pipeline flanges 3 is 2, and the size of the pipeline flanges corresponds to that of a pipe flange 19 on a special connecting pipe fitting 1. The pipeline cutting beveling machine 4 is provided with a blade assembly 41, and each pipeline cutting beveling machine is provided with 2 groups of blades. When the pipeline cutting beveling machine 4 is opened and closed, the stay positions of the blades are symmetrical to the two sides of the pipeline 100.
Before installing the pipeline sealed cabin 2, the pipeline flange 3 and the pipeline hanging ring 6 are welded on corresponding parts of the pipeline 100, and the pipeline cutting beveling machine 4 is installed and debugged.
4. Connection of connecting tube 1 to pipe 100
As shown in fig. 8 to 10, the connection of the connection pipe fitting 1 and the pipe 100 is achieved by a synchronous hydraulic (pneumatic) jack 7. The synchronous hydraulic (pneumatic) jack 7 is arranged between two pipe fitting flanges 19 on the connecting pipe fitting 1, the number of the synchronous hydraulic (pneumatic) jack is determined according to the pipe diameter (generally, half of the number of flange bolt holes), and the synchronous hydraulic (pneumatic) jack is symmetrically arranged at intervals with the bolt holes of the pipe fitting flanges 19 of the connecting pipe fitting 1.
By opening the synchronous jack 7, the synchronous jack slowly runs, and the first pipe fitting 11 and the second pipe fitting 12 of the connecting pipe fitting 1 slowly slide. The total length of the connecting pipe fitting 1 after sliding is equal to the distance between the inner sides of two pipe flanges 3 installed on the pipe 100; and the sum of the thicknesses of the first sealing ring 16 and the second sealing ring 17 at the two ends of the special connecting pipe fitting 1 is equal to the thickness of the middle third sealing ring 18. After the special connecting pipe fitting 1 slides in place, the flange bolts are installed under the acting force of the synchronous jack 7. When the two ends of the connecting pipe fitting 1 are respectively connected with the pipe flanges 3 on the two sides, one side of the third sealing ring 18 is contacted with the check ring 15, and the other side is contacted with the inner wall of the first pipe fitting flange 191; and the first pipe flange 191 is connected with the adjacent pipe flange 3 through bolts, and the second pipe flange 192 is connected with the adjacent pipe flange through bolts.
The first pipe flange 191 and the second pipe 12 are welded to each other in an annular manner at the X-position. The first pipe flange 191 and the retainer 15 may be provided with corresponding bolt holes in advance, and they may be connected by bolts.
The main steps of replacing a partial pipe section of the water supply pipeline without cutting off water by adopting the device for replacing the pipe section or the valve without cutting off water on the water supply pipeline are as follows: pipeline polishing, cleaning and disinfecting, welding accessories such as flanges, installing a cutting beveling machine and a sealed cabin, cutting a pipeline, taking out an old pipe section, putting in a new pipe fitting and connecting the pipeline. The specific operation is as follows:
1. pipeline polishing, cleaning and disinfecting
Because the whole process of replacing the subsequent pipe section is carried out in a closed space under the condition of continuous water supply, in order to ensure the water quality safety of the water supply and ensure the stable installation and welding of equipment and pipe fittings, the outer surfaces of the pipe section to be replaced and the peripheral pipe are required to be polished, cleaned and disinfected in advance.
2. Pipe out-of-roundness and pipe borrowing angle measurement
After finishing polishing and cleaning and disinfecting work of the construction operation part, carrying out measurement work of out-of-roundness of the pipeline of the construction operation part and borrowing and rotating angles of the pipeline so as to ensure that equipment such as a follow-up cutting machine and the like are installed smoothly; and according to the measurement result, checking the size of the flange and the special connecting pipe fitting 1, and ensuring that the out-of-roundness of the original pipeline and the borrowing angle are within the allowable deviation of the installation of the original pipeline. In general, it is considered that the smaller diameter pipe (proposed DN400 and below) does not need to be measured for out-of-roundness and angle by rotation, and only needs to ensure that the installation meets the following requirements when welding the pipe flange 3.
3. Welding of fittings such as pipe flange 3 and mounting of pipe cutting beveling machine
The welding position of the two pipeline flanges 3 is determined by the size and the length of a new pipe section finally installed, the welding is carried out after the position is determined strictly according to the related length requirement, and the two planes of the two welded flange plates are parallel to each other so as to ensure that the subsequent screws and nuts are aligned; the welding positions of the two pipeline hanging rings 6 are arranged on the principle of conveniently lifting the pipeline to be replaced, and the welding positions are required to be symmetrical as much as possible.
The two pipeline cutting beveling machines 4 need to select corresponding types according to the diameter and the wall thickness of the pipeline, and adjust the cutting blades according to the out-of-roundness of the pipeline. The installation parts of the cutting beveling machine are required to be respectively close to the two welded flanges as much as possible so as to ensure that the new pipe section is installed smoothly.
4. Installation of a pipe seal cabin 2
(1) Before the pipeline sealed cabin 2 is installed, the welding, the installation position and the strength of the pipeline flange plate 3 and the pipeline cutting beveling machine 4 are required to meet the requirements respectively.
(2) The components of the pipeline capsule 2 should be installed piece by piece in a bottom-top order.
(3) Before the top cover plate of the pipeline sealing cabin 2 is installed, a power line and a pipeline hoisting rope of a hydraulic (pneumatic) jack of the pipeline cutting beveling machine 4 are required to be installed, the power line is connected with a power station outside the sealing cabin through a power line penetrating opening 9 on the sealing cabin cover plate, the power line penetrating opening 9 is provided with a sealing member, and the inner wall of the sealing cabin cover plate is provided with a corresponding connecting interface of the hoisting rope, so that installation and connection fastening are ensured during installation.
(4) In order to avoid secondary pollution to the water quality of the water supply in the replacement process, ensure the safety of the water quality of the water supply, the inside of the cabin and the top cover plate are washed and disinfected again before the top cover plate of the sealed cabin is installed, and the washing water is discharged by utilizing the drain outlet 23 at the bottom of the sealed cabin.
(5) After closing the drain opening 23 and installing the sealing cabin cover plate, water injection and pressure tests are performed on the sealing cabin, wherein the test pressure is greater than the water pressure of the water supply pipeline, and the water pressure of the water supply pipeline is recommended to be 1.5 times. And after the pressure test of the sealed cabin is qualified, the pressure is relieved until the water pressure in the sealed cabin is close to the water supply pressure of the pipeline. And the next step, cutting the pipeline.
5. Cutting and removal of pipes
After the rope connected to the pipeline hanging ring 6 is tensioned by operating the sealed cabin lifting hand wheel 25, a pipeline cutting beveling machine 4 on one side of the pipeline is started, the pipeline is cut on one side, and after the cutting is completed, the beveling of the pipeline is continued, namely the width of a pipeline cutting gap on the side is increased. When the pipe cutting gap is generated, the side water outlet 23 at the bottom of the sealed cabin should be slowly opened to discharge the scrap iron to the greatest extent.
After the pipeline on one side of the pipeline cutting beveling machine 4 is cut and beveled, the lifting hand wheel 25 is operated again to tighten the pipeline, and then the other pipeline cutting beveling machine 4 is started to cut and beveled on the other side of the pipeline. At the same time, all the water outlets 23 at the bottom of the sealed cabin should be slowly opened to discharge the scrap iron.
After the pipe is cut, the cutter blades are stopped at two sides of the pipe, and the cut pipe section can be taken out smoothly by operating the lifting hand wheel 25.
When the cut pipe section is lifted by the lifting hand wheel 25, if the situation that the pipe section is blocked with the original pipeline due to water flow flushing occurs, the hand wheel of the 4 positioning screws 28 on the sealed cabin is used for adjusting, so that the cut pipe section is smoothly lifted above the gate valve 8, the gate valve 8 is closed, and the top cover plate 30 of the sealed cabin can be opened at the moment to take out the pipe section and the pipeline cutting beveling machine 4.
6. Insertion of new tubular elements, i.e. connecting tubular elements 1
The connection pipe 1 is put in the reverse process of taking out the pipe section, and the concrete steps are as follows:
(1) The synchronous hydraulic (pneumatic) jack 7 is arranged on the special connecting pipe fitting 1 in advance, a power transmission line penetrates into the lower part of the sealing cabin cover plate from the power line penetrating opening 9, the power line penetrating opening 9 is sealed, the jack and the corresponding interfaces of the power station are connected, and the special connecting pipe fitting 1 is suspended at the corresponding position of the top cover plate of the pipeline sealing cabin 2 through a rope.
(2) The top cover plate 30 of the sealed cabin is installed, and water is injected into the upper cabin of the sealed cabin through the connecting pipes 31 of the upper cabin and the lower cabin, so that the water pressure of the upper cabin and the lower cabin is the same.
(3) And opening the gate valve 8 of the sealed cabin, operating the lifting hand wheel 25 to slowly put down the new pipe fitting, and adjusting the position-adjusting screws 28 to enable the limiting member 13 on the new pipe fitting to be matched with the pipeline flange 3 on the pipeline so as to ensure that the new pipe fitting is successfully butted with the original pipeline in the next step.
6. Connection of pipes
(1) The synchronous hydraulic (pneumatic) jack 7 is slowly opened and is observed through the capsule-viewing flange window 24. When the pressure of the synchronous jack 7 acting on the special connecting pipe fitting 1 reaches a specified value, the first pipe fitting 11 slides relative to the second pipe fitting 12, the total length of the first pipe fitting 11 and the second pipe fitting 12 after sliding is equal to the distance between the inner sides of two pipe flanges 3 installed on the pipe, the pipe flanges 19 on the first pipe fitting 11 and the second pipe fitting 12 correspond to the positions of the pipe flanges 3 installed on the pipe, and the supporting force of the jack 7 is maintained.
(2) Slowly opening a water outlet 23 on the pipeline sealed cabin 2, observing the pressure change in the pipeline sealed cabin 2, and rapidly reducing the water pressure to 0 at the moment; the water in the pipe sealed cabin 2 is drained, the pipe sealed cabin 2 is removed, and at the same time, a sealed cabin top cover plate 30 is suspended (at this time, the power transmission line is also connected to the cover plate), 4 flange bolts are installed, and the installation and fastening of the bolts are ensured.
(3) The jacks 7 are detached one by one, and meanwhile, 4 flange bolts are installed one by one; after the bolts are fastened, all devices are removed.
(4) In order to prevent the X part from leaking water due to expansion and contraction of the pipeline in the future, the X part is welded.
In order to realize the whole process of replacing the partial pipe section on the water supply pipeline without stopping water, if the pipe section is longer or facilities such as a valve are replaced, only the sealed cabin with corresponding length is customized, and the special connecting pipe fitting is connected with the valve.
The foregoing is a further detailed description of the invention in connection with the preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the invention, and these should be considered to be within the scope of the invention.

Claims (6)

1. A method for realizing replacement of a pipe section or a valve on a water supply pipeline without stopping water, characterized in that: which comprises the following steps:
step S1, installing pipeline flanges on two sides of a pipeline or a valve to be replaced, arranging two pipeline cutting beveling machines between the pipeline flanges, and enabling the pipeline cutting beveling machines to be respectively positioned on the inner sides of the pipeline flanges on the two sides;
s2, installing a pipeline sealed cabin at a pipeline or a valve to be replaced, wherein the pipeline sealed cabin is in sealing connection with a water supply pipeline; the pipeline sealed cabin is divided into an upper sealed cabin and a lower sealed cabin through a gate valve, and the water supply pipeline passes through the lower sealed cabin and is positioned in the lower sealed cabin by a pipeline flange plate and a pipeline cutting beveling machine; installing a lifting member on a pipeline or a valve to be replaced; the lower sealed cabin is provided with a water outlet; the top of the upper sealed cabin is provided with a sealed cabin cover plate, the sealed cabin cover plate is provided with a power line penetrating hole, the sealed cabin cover plate is provided with a pipeline hoisting rope, the outer side of the sealed cabin cover plate is provided with a hoisting device connected with the pipeline hoisting rope, and the hoisting device is connected with a hoisting member through the pipeline hoisting rope; step S3, starting a pipeline cutting beveling machine on one side, cutting one side of a pipeline, and beveling the pipeline after cutting is completed;
s4, starting a pipeline cutting beveling machine at the other side to cut and bevel;
s5, lifting the replaced pipeline or valve to be above the gate valve through a lifting device, enabling the pipeline or valve to be positioned in the upper sealed cabin, and closing the gate valve; opening a sealing cabin cover plate, and taking out the pipe section and the pipeline cutting beveling machine;
s6, placing a connecting pipe fitting into the upper sealed cabin, wherein two ends of the connecting pipe fitting comprise a connecting interface and a limiting member corresponding to the pipeline flange plate, and the connecting pipe fitting comprises a first pipe fitting and a second pipe fitting; one end of the second pipe fitting is sleeved into the first pipe fitting and is in sliding connection with the first pipe fitting, a driving mechanism for enabling the first pipe fitting to slide relative to the second pipe fitting is arranged between the first pipe fitting and the second pipe fitting, and the driving mechanism is an air pressure or hydraulic jack; closing a sealing cabin cover plate, opening a gate valve, placing the connecting pipe fitting at an installation position through a lifting device, and opening a driving mechanism to enable the first pipe fitting to slide relative to the second pipe fitting, and enabling two ends of the connecting pipe fitting to be connected with pipeline flanges on two sides respectively; and removing the pipeline sealed cabin under the action force of the retaining driving mechanism, and fixing the two ends of the connecting pipe fitting with the pipeline flanges on the two sides respectively.
2. The method of effecting replacement of a pipe segment or valve on a water supply pipe without stopping the water as claimed in claim 1, wherein: step S3, before a pipeline cutting beveling machine at one side is started, water is injected into the pipeline sealing cabin, so that the water pressure in the pipeline sealing cabin is close to the water supply pressure of the water supply pipeline; after the step S6, the method further comprises the step of fixedly connecting the joint of the first pipe fitting and the second pipe fitting.
3. The method of effecting replacement of a pipe segment or valve on a water supply pipe without stopping the water as claimed in claim 1, wherein: the pipeline sealed cabin and the water supply pipeline are sealed through a rubber ring or welded and sealed through a transition pipe fitting.
4. The method of effecting replacement of a pipe segment or valve on a water supply pipe without stopping the water as claimed in claim 1, wherein: in the step S3 and the step S4, when a pipeline cutting gap is generated, a water outlet of a pipeline sealed cabin is opened, scrap iron is discharged, and the water outlet is closed; in step S3, after cutting and beveling the single side of the pipeline, the method further comprises tensioning the pipeline or the valve to be replaced through a lifting device.
5. The method of effecting replacement of a pipe segment or valve on a water supply pipe without stopping the water as claimed in claim 1, wherein: before the step S1, the method further comprises polishing, cleaning and disinfecting the outer surface of the pipe section to be replaced and the outer surface of the peripheral pipeline.
6. The method for realizing replacement of a pipe section or a valve on a water supply pipeline without stopping water according to any one of claims 1 to 5, wherein: the opening part of the first pipe fitting is provided with a first sealing ring, the tail part of the second pipe fitting is provided with a second sealing ring, the pipe wall of the second pipe fitting sleeved in the first pipe fitting is provided with a third sealing ring, and the third sealing ring is positioned between the tail part of the first pipe fitting and the opening part of the second pipe fitting; the sum of the thicknesses of the first sealing ring and the second sealing ring is not larger than the thickness of the third sealing ring.
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