A construction method for replacing a water supply pipeline without stopping the water supply

Abstract

This application relates to the technical field of pipeline replacement construction, and proposes a construction method for replacing a water supply pipeline without stopping water, including the following steps: S1: Lay a temporary pipe on the ground beside the damaged pipe section of the water supply pipe; S2: Weld and install a water supply interface pipe and a water cut-off interface pipe on the normal pipe sections at both ends of the damaged pipe section of the water supply pipe; S3: Connect both the water supply interface pipe and the water cut-off interface pipe to the water supply pipe; S4: Connect the two ends of the temporary pipe to the water supply interface pipes at both ends of the damaged pipe section of the water supply pipe respectively; S5: Install a water cut-off device on the water cut-off interface pipes at both ends of the damaged pipe section of the water supply pipe; S6: Cut off and transfer the damaged pipe section and reinstall a new pipe section in place; S7: Remove the water cut-off devices on the two water cut-off interface pipes; S8: Remove the temporary pipe. This application has the effect of reducing the impact of the replacement of the water supply pipe section on the normal production and domestic water use of residents.

Description

Technical Field

[0001] The present application relates to the field of pipeline replacement construction, and in particular to a construction method for replacing a water supply pipeline without stopping the water supply. Background Art

[0002] As the service life of water supply pipes in urban water supply networks increases, the inner and outer walls of the pipes are prone to corrosion and damage, which can easily cause leaks during daily use, affecting the normal water supply of the water supply network. In order to ensure the normal operation of the water supply network, it is necessary to regularly inspect the network pipes and replace the corroded and damaged water supply pipe sections in a timely manner.

[0003] The traditional construction plan for replacing a water supply pipe section is to lay a new pipe section on one side of the damaged section of the water supply pipe; after pressure testing, disinfecting and flushing the new pipe section, the water supply pipe is shut off and the new pipe section is connected to the normal section of the water supply pipe. At the same time, the damaged section of the water supply pipe is dismantled, transferred or grouted.

[0004] With regard to the above-mentioned related technologies, the construction plan for replacing the water supply pipe section requires stopping the water supply of the water supply pipe during the actual construction process, which may easily cause large-scale water outages in the surrounding areas, seriously affecting the normal production and life of residents; and the laying of the new pipe section requires re-excavation of the installation position; the overall excavation volume of the construction is large; therefore, there is room for improvement. Summary of the invention

[0005] In order to reduce the impact of the replacement of damaged sections of water supply pipes on the normal water supply of the water supply pipes, the present application provides a construction method for replacing water supply pipelines without stopping water supply.

[0006] This application provides a construction method for replacing a water supply pipeline without stopping water, which adopts the following technical solution:

[0007] A construction method for replacing a water supply pipeline without stopping water supply, comprising the following steps:

[0008] S1: Temporary pipe in place: lay temporary pipes on the ground next to the damaged section of the water supply pipe;

[0009] S2: Interface pipe installation: Weld and install the water supply interface pipe and the water cut-off interface pipe on the normal pipe sections at both ends of the damaged pipe section of the water supply pipe. The water cut-off interface pipe is installed close to the damaged pipe section of the water supply pipe;

[0010] S3: Pipeline drilling: drilling holes on the water supply interface pipe and the water cut-off interface pipe by using a drilling device, so that the water supply interface pipe and the water cut-off interface pipe are connected to the water supply pipe;

[0011] S4: Temporary pipe connection construction: connect the two ends of the temporary pipe to the water supply interface pipes at both ends of the damaged pipe section of the water supply pipe, so that the damaged pipe section of the water supply pipe and the temporary pipe can supply water at the same time;

[0012] S5: Treatment of the damaged pipe section plugging: Install water cut-off devices on the water cut-off interface pipes at both ends of the damaged pipe section of the water supply pipe, and use the water cut-off devices to plug the two ends of the damaged pipe section of the water supply pipe;

[0013] S6: Pipe section replacement: Cut off and transfer the damaged pipe section, and reinstall the new pipe section in situ;

[0014] S7: Connecting the new pipe section to supply water: Remove the water cut-off devices on the two water cut-off interface pipes, and seal the water cut-off interface pipes. The water supply pipe supplies water to the new pipe section;

[0015] S8: Removal of the temporary pipe: Seal the water supply interface pipe and remove the temporary pipe. The water supply pipe supplies water to the new pipe section alone.

[0016] By adopting the above technical solution, by laying out the temporary pipe and connecting the temporary pipe to the water supply interface pipes at both ends of the damaged pipe section of the water supply pipe, the double-pipe water supply state of the water supply pipe and the temporary pipe is realized. Then, install water cut-off devices on the water cut-off interface pipes at both ends of the damaged section of the water supply pipe, and use the water cut-off devices to plug the damaged pipe section of the water supply pipe to limit the water supply of the water supply pipe to the damaged pipe section, which is convenient for cutting and removing the damaged pipe section; after the damaged pipe section is removed and the new pipe section is reinstalled in place, then remove the water cut-off device and the temporary pipe, and seal the water supply interface pipe and the water cut-off interface pipe to restore the water supply to the new pipe section. The whole process of pipe section replacement construction does not require stopping the water supply treatment of the water supply pipe, which is beneficial to maintaining the normal operation of the whole water supply pipe, greatly reducing the impact of the pipe section replacement construction process on the normal domestic and production water use of the surrounding residents; and compared with the traditional method of excavating and paving the new pipe section on one side of the damaged pipe section of the water supply pipe, the new pipe section of the present application is reinstalled in situ, reducing the overall excavation volume during the construction process. At the same time, the temporary pipe can be reused after subsequent removal, which is beneficial to reducing the overall construction cost.

[0017] Preferably, interface flanges are coaxially connected to the ends of both the water supply interface pipe and the water cut-off interface pipe that are far from the water supply pipe;

[0018] In step S2, after welding the water supply interface pipe and the water cut-off interface pipe to the normal pipe section of the water supply pipe, install gate valves on the interface flanges of the water supply interface pipe and the water cut-off interface pipe;

[0019] In step S3: After the water supply interface pipe and the water cut-off interface pipe open holes in the water supply pipe through the hole-opening equipment, seal the water supply interface pipe and the water cut-off interface pipe respectively through the gate valves installed on both the water supply interface pipe and the water cut-off interface pipe.

[0020] By adopting the above technical solution, by installing a gate valve on the interface flanges of both the water supply interface pipe and the water cut-off interface pipe, the opening and closing of the corresponding water supply interface pipe or water cut-off interface pipe can be controlled by the gate valve. Subsequently, during the construction process, after completing construction steps such as opening the water supply pipe and removing the temporary pipe, the water supply interface pipe and the water cut-off interface pipe can be timely blocked by the gate valve to restrict the water in the water supply pipe from flowing out from the water supply interface pipe and the water cut-off interface pipe.

[0021] Preferably, the water cut-off device includes a first support cylinder with one end open and the other end closed. A first connection flange is coaxially arranged at the open end of the first support cylinder. A plugging airbag is also arranged inside the first support cylinder, and the plugging airbag is communicated with an air pipe. The air pipe coaxially penetrates through the closed end of the first support cylinder. The first support cylinder is provided with a first lifting driving member corresponding to the air pipe, and the first lifting driving member is drivingly connected with the air pipe for driving the air pipe to drive the plugging airbag to move radially along the first support cylinder.

[0022] In step S2, the water supply pipe is subjected to water cut-off treatment by the water cut-off device. After connecting the first connection flange at the open end of the first support cylinder to the end flange of the gate valve on the water cut-off interface pipe, the first lifting driving member is used to drive the air pipe to drive the plugging airbag to move radially along the first support cylinder towards the direction close to the water supply pipe until the plugging airbag enters the water supply pipe through the gate valve and the cut part of the water supply pipe. The plugging airbag is inflated through the air pipe so that the plugging airbag expands and blocks the inner cavity of the water supply pipe.

[0023] By adopting the above technical solution, when plugging the water supply pipe, after the first lifting driving member drives the air pipe to drive the plugging airbag into the inner cavity of the water supply pipe, the plugging airbag is inflated to make the plugging airbag expand, and thus the plugging of the water supply pipe can be realized. When the water cut-off device is subsequently removed, the gas in the plugging airbag is released, and then the first lifting driving member drives the air pipe to drive the airbag to retract into the first support cylinder, so as to block the water cut-off interface pipe through the gate valve and restrict the situation that the water in the water supply pipe overflows through the water cut-off interface pipe after the first support cylinder is removed from the gate valve subsequently.

[0024] Preferably, a protection cylinder is also coaxially supported inside the first support cylinder. The protection cylinder has one end open and the other end closed. The open end of the protection cylinder is close to the open end of the first support cylinder. The plugging airbag is located inside the protection cylinder, and the air pipe coaxially penetrates through the closed end of the protection cylinder. The first support cylinder is provided with a second lifting driving member corresponding to the protection cylinder, and the second lifting driving member is drivingly connected with the protection cylinder for driving the protection cylinder to move radially along the first support cylinder.

[0025] In step S2, when the plugging airbag is driven by the first lifting driving member to move radially along the first support cylinder towards the water supply pipe, the protection cylinder is driven by the second lifting driving member to move synchronously with the plugging airbag; after the plugging airbag completely enters the inner cavity of the water supply pipe, the protection cylinder is driven by the second lifting driving member to retract into the first support cylinder.

[0026] By adopting the above technical solution, the cut of the water supply pipe is usually rough and sharp. In the process of directly driving the plugging airbag to enter the inner cavity of the water supply pipe through the cut of the water supply pipe by the first lifting driving member, affected by the water flow impact, the plugging airbag is extremely easy to rub against the cut of the water supply pipe or be hooked on the cut; resulting in the plugging airbag being cut by the cut of the water supply pipe. Through the setting of the protection cylinder and the second lifting driving member, the protection cylinder is driven by the second lifting driving member to move synchronously with the plugging airbag, so that the plugging airbag can always be located inside the protection cylinder during the process of entering the inner cavity of the water supply pipe, and the protection cylinder is used to limit the contact between the plugging airbag and the cut of the water supply pipe during the contact process, thereby effectively limiting the situation that the plugging airbag is cut by the cut of the water supply pipe.

[0027] Preferably, the following steps are further included:

[0028] S9: Install a sealing plate on the interface flanges of both the water supply interface pipe and the water cut-off interface pipe through a sealing member installation device to block the interface flanges;

[0029] S10: Remove the gate valves on the water supply interface pipe and the water cut-off interface pipe;

[0030] S11: Install a fixed flange cover at the end of the interface flange.

[0031] By adopting the above technical solution, the gate valves can be recycled repeatedly, which is beneficial to reducing the overall construction cost.

[0032] Preferably, threaded holes are circumferentially formed around the outer periphery of the interface flange, and the threaded holes communicate with the inner periphery of the interface flange; stud bolts are threadedly connected in the threaded holes;

[0033] The specific steps of step S9 are as follows:

[0034] S9.1: Install a sealing member installation device at the flange at the end of the gate valve;

[0035] S9.2: Open the gate valve, and insert a sealing plate for blocking the interface flange into the inner periphery of the interface flange through the sealing member installation device;

[0036] S9.3: Turn the stud bolts on the outer periphery of the interface flange until the stud bolts abut against the outer periphery of the sealing plate inside the interface flange to temporarily block the interface flange through the sealing plate;

[0037] S9.4: Remove the sealing member installation device on the gate valve.

[0038] By adopting the above technical solution, the stud pre-installed on the interface flange is used to fix and limit the sealing plate inside the interface flange, so as to cooperate with the sealing plate to block the interface flange and restrict the water in the water supply pipe from flowing out of the water supply interface pipe and the water intercepting interface pipe, which is convenient for smoothly removing the gate valves on the water supply interface pipe and the water intercepting interface pipe subsequently.

[0039] Preferably, the sealing member installation device includes a second support cylinder with one end open and the other end closed; a second connecting flange is coaxially connected to the open end of the second support cylinder; a driving rod is coaxially supported inside the second support cylinder; one end of the driving rod passes through the closed end of the second support cylinder, and the other end of the driving rod is threadedly connected to the sealing plate;

[0040] In step S9.2, connect the second connecting flange at the open end of the second support cylinder to the flange end of the gate valve; after opening the gate valve, move the driving rod radially towards the water supply pipe along the second support cylinder until the sealing plate moves to the inner circumference of the interface flange;

[0041] In step S9.3, after the stud abuts against the outer circumference of the sealing plate, rotate the driving rod to make the driving rod disengage from the sealing plate.

[0042] By adopting the above technical solution, by threadedly connecting the end of the driving rod to the sealing plate, on the one hand, during the installation stage of the sealing plate, it is convenient for the operator to insert the sealing plate into the connecting flange by moving the driving rod; on the other hand, after the sealing plate is limited and fixed by several studs at the connecting flange, by rotating the driving rod, the separation of the driving rod and the sealing plate can be realized, which is convenient for subsequently removing the sealing member installation device from the gate valve.

[0043] Preferably, a support ring is also coaxially connected to the inner circumference of the interface flange for the sealing plate to abut against;

[0044] When the bottom of the sealing plate abuts against the support ring, the threaded hole is disposed opposite to the outer circumference of the sealing plate.

[0045] By adopting the above technical solution, the support ring can support and position the sealing plate to limit the displacement of the support ring inside the interface flange, which is convenient for the studs on the outer circumference of the interface flange to better abut against the outer circumference of the sealing plate subsequently.

[0046] In summary, the present application includes at least one of the following beneficial technical effects:

[0047] 1. By connecting both ends of the temporary pipe to the normal sections at both ends of the damaged section of the water supply pipe respectively, after forming simultaneous water supply from the water supply pipe and the temporary pipe, perform cut-off treatment on both ends of the damaged section of the water supply pipe, and reinstall a new pipe section in-situ to complete the replacement construction of the damaged pipe section of the water supply pipe. During the construction period, the water supply pipe can maintain a normal water supply state through the temporary pipe, without the need to cut off the water supply to the water supply pipe, effectively reducing the impact of the replacement construction of the water supply pipe section on the normal production and life of residents.

[0048] 2. When the first lifting drive member drives the air pipe to drive the plugging airbag into the inner cavity of the water supply pipe, the second lifting drive member drives the protective cylinder to move together with the plugging airbag, which is beneficial to restricting the situation where the plugging airbag is cut or scratched by the water supply pipe when passing through the cut of the water supply pipe.

[0049] 3. Through the threaded connection between the drive rod of the seal installation device and the seal plate, when installing the seal plate, the seal plate can be moved into the interface flange by moving the drive rod; subsequently, by screwing the stud on the outer periphery of the interface flange so that the stud abuts against the outer periphery of the seal plate, the drive rod can be rotated to make the drive rod disengage from the seal plate, facilitating the removal of the seal installation device. Description of the Drawings

[0050] Figure 1 is a schematic diagram of the present application for showing the state of installing the water supply interface pipe and the water cut-off interface pipe.

[0051] Figure 2 is a schematic diagram of the present application for showing the state of installing a gate valve on the water supply interface pipe and the water cut-off interface pipe.

[0052] Figure 3 is a schematic diagram of the present application for showing an electric pipe pressure tapping machine.

[0053] Figure 4 is a schematic diagram of the present application for showing the state of connecting the temporary pipe.

[0054] Figure 5 is a schematic diagram of the present application for showing the state of performing cut-off treatment on both ends of the damaged pipe section.

[0055] Figure 6 is a schematic diagram of the present application for showing the installation of the water cut-off device.

[0056] Figure 7 is a schematic diagram of the present application for showing the plugging of the water supply pipe through the water cut-off device.

[0057] Figure 8 is Figure 6 an enlarged schematic diagram of part A in

[0058] Figure 9 is a schematic diagram of the present application for showing the cutting and removing of the damaged pipe section.

[0059] Figure 10 This is a schematic diagram of the present application for indicating the reset installation of a new pipe section.

[0060] Figure 11 This is a schematic diagram of the present application for indicating the installation of a sealing plate through a sealing element installation device.

[0061] Figure 12 is Figure 11 an enlarged schematic diagram of part B in

[0062] Figure 13 This is a schematic diagram of the present application for indicating the installation of a flange cover on an interface flange.

[0063] Figure 14 This is a schematic diagram of the present application for indicating the water supply pipe after the replacement construction of the new pipe section is completed.

[0064] Explanation of reference numerals:

[0065] 1. Water supply pipe; 10. Temporary pipe; 11. Water supply interface pipe; 12. Water cut-off interface pipe; 13. Gate valve; 14. Interface flange; 141. Threaded hole; 142. Stud; 143. Support ring; 15. Electric pipeline pressure tapping machine; 151. Frame; 152. Main shaft; 155. Cutting tool; 153. Rotary drive mechanism; 154. Feed drive mechanism; 2. Water cut-off device; 21. First support cylinder; 211. First connection flange; 20. Sealing airbag; 22. Air pipe; 23. First lifting oil cylinder; 24. Casing; 240. Water permeable hole; 241. Connecting rod; 25. Second lifting oil cylinder; 3. Sealing element installation device; 30. Sealing plate; 31. Second support cylinder; 311. Second connection flange; 32. Drive rod; 321. Holding handle; 4. Flange cover. Specific embodiments

[0066] The following is a further detailed description of the present application in conjunction with the attached Figure 1-13 drawings.

[0067] The embodiment of the present application discloses a construction method for replacing a water supply pipeline without stopping water, including the following steps:

[0068] S1: Placement of the temporary pipe 10: Refer to Figure 1 , and lay the temporary pipe 10 on the ground of the damaged pipe section of the water supply pipe 1; the temporary pipe 10 is a self-anchored pipeline, which is convenient for subsequent installation, and is simple and convenient to remove later and can be reused.

[0069] S2: Installation of the interface pipe: Refer to Figure 1 and Figure 2 , and the specific steps are as follows:

[0070] S2.1: Weld and install a water supply interface pipe 11 and a water cut-off interface pipe 12 on the normal pipe sections at both ends of the damaged pipe section of the water supply pipe 1. The water cut-off interface pipe 12 is arranged close to the damaged pipe section of the water supply pipe 1.

[0071] At one end of both the water supply interface pipe 11 and the water cut-off interface pipe 12 away from the water supply pipe 1, an interface flange 14 is coaxially connected.

[0072] S2.3: Install a gate valve 13 at the interface flange 14 at the ends of both the water supply interface pipe 11 and the water cut-off interface pipe 12.

[0073] S3: Pipe opening: Refer to Figure 2 and Figure 3 , and use an opening device to open a hole in the water supply pipe 1 on the water supply interface pipe 11 and the water cut-off interface pipe 12, so that both the water supply interface pipe 11 and the water cut-off interface pipe 12 are communicated with the water supply pipe 1.

[0074] The opening device adopts an existing electric pipeline pressure - maintaining hole - opening machine 15; the electric pipeline pressure - maintaining hole - opening machine 15 includes a frame 151, a main shaft 152, a rotary drive mechanism 153 and a feed drive mechanism 154; a flange structure is arranged at the end of the frame 151; the main shaft 152 is installed in the frame 151, and a cutting tool 155 is connected to the end of the main shaft 152; the rotary drive mechanism 153 is drivingly connected to the main shaft 152 to drive the main shaft 152 to rotate; the feed drive mechanism 154 is drivingly connected to the main shaft 152 to drive the main shaft 152 to feed along its own axis.

[0075] The specific steps of step S3 are as follows:

[0076] S3.1: Installation and fixation of the electric pipeline pressure - maintaining hole - opening machine 15: Connect and fix the flange structure at the end of the frame 151 of the electric pipeline pressure - maintaining hole - opening machine 15 to the flange structure at the end of the gate valve 13;

[0077] S3.2: Open the gate valve 13;

[0078] S3.3: The rotary drive mechanism 153 and the feed drive mechanism 154 cooperate to drive the main shaft 152 to drive the cutting tool 155 to move towards the pipe body of the water supply pipe 1 to cut an opening in the pipe body of the water supply pipe 1;

[0079] S3.4: The rotary drive mechanism 153 and the feed drive mechanism 154 cooperate to drive the main shaft 152 to drive the cutting tool 155 to retract into the frame 151;

[0080] S3.5: Close the gate valve 13;

[0081] S3.6: Remove the frame 151 of the electric pipeline pressure - maintaining hole - opening machine 15 from the gate valve 13.

[0082] S4: Construction of the access of the temporary pipe 10: Refer toFigure 1 and Figure 4 , the specific steps are as follows:

[0083] S4.1: Connect both ends of the temporary pipe 10 to the gate valves 13 on the two water supply interface pipes 11 respectively;

[0084] S4.2: Open the gate valves 13 on the water supply interface pipes 11 to supply water to the temporary pipe 10 through the water supply pipe 1; form double-pipe simultaneous water supply to the damaged pipe section of the water supply pipe 1 and the temporary pipe 10;

[0085] S4.3: Disconnect the connection between the branch pipe of the damaged pipe section of the water supply pipe 1 and the user water pipe, connect the temporary pipe 10 to the user water pipe, and supply water to the user water pipe through the temporary pipe 10.

[0086] S5: Plugging treatment for the damaged pipe section: Refer to Figure 5 , install the water intercepting device 2 on the water intercepting interface pipes 12 at both ends of the damaged pipe section of the water supply pipe 1, and intercept and seal both ends of the damaged pipe section of the water supply pipe 1 through the water intercepting device 2.

[0087] Refer to Figures 6 to 8 , the water intercepting device 2 includes a first support cylinder 21; one end of the first support cylinder 21 is open and the other end is closed; a first connection flange 211 is coaxially connected to the end of the open end of the first support cylinder 21. A plugging airbag 20 is arranged in the first support cylinder 21; an air pipe 22 is communicated with the plugging airbag 20; the air pipe 22 is made of a metal pipe fitting; one end of the air pipe 22 away from the plugging airbag 20 coaxially penetrates through the closed end of the first support cylinder 21. The first support cylinder 21 is provided with a first lifting driving member corresponding to the air pipe 22. The first lifting driving member includes a first lifting oil cylinder 23, the first lifting oil cylinder 23 is located on the outer periphery of the first support cylinder 21 and the axis directions of the first lifting oil cylinder 23 and the first support cylinder 21 are parallel, the bottom end of the first lifting oil cylinder 23 is connected to the outer periphery of the first support cylinder 21; the top end of the piston rod of the first lifting oil cylinder 23 is connected to one end of the air pipe 22 away from the plugging airbag 20 through a connecting block, so as to realize that the first lifting driving member drives and connects to the air pipe 22, and subsequently, the air pipe 22 can be driven by the first lifting oil cylinder 23 to drive the plugging airbag 20 to move along the axis direction of the first support cylinder 21.

[0088] A protection cylinder 24 is also coaxially supported inside the first support cylinder 21. One end of the protection cylinder 24 is open, and the other end is closed. The open end of the protection cylinder 24 is arranged close to the open end of the first support cylinder 21. The plugging airbag 20 is received inside the protection cylinder 24, and the air pipe 22 coaxially penetrates through the closed end of the protection cylinder 24. A plurality of water permeable holes 240 are evenly formed in the closed end of the protection cylinder 24. A connecting rod 241 is also connected to the closed end of the protection cylinder 24. The connecting rod 241 and the first support cylinder 21 are arranged parallel to each other in the axial direction. One end of the connecting rod 241 away from the protection cylinder 24 penetrates through the closed end of the first support cylinder 21. The first support cylinder 21 is provided with a second lifting driving member corresponding to the protection cylinder 24. The second lifting driving member includes a second lifting oil cylinder 25. The second lifting oil cylinder 25 is located outside the first support cylinder 21, and the second lifting oil cylinder 25 and the first support cylinder 21 are arranged parallel to each other in the axial direction. The bottom end of the second lifting oil cylinder 25 is connected to the outside of the first support cylinder 21. The top end of the piston rod of the second lifting oil cylinder 25 is connected to one end of the connecting rod 241 away from the protection cylinder 24 through a connecting block, so that the second lifting driving member drives and connects to the protection cylinder 24. Subsequently, the protection cylinder 24 can be driven by the second lifting oil cylinder 25 to move along the axial direction of the first support cylinder 21.

[0089] Refer to Figures 6 to 8 , the specific steps of step S5 are as follows:

[0090] S5.1: Installation of the water cut-off device 2: Connect and fix the first connection flange 211 at the open end of the first support cylinder 21 to the end flange of the gate valve 13 on the water cut-off interface pipe 12:

[0091] S5.2: Open the gate valve 13;

[0092] S5.3: Drive the air pipe 22 by the first lifting oil cylinder 23 to drive the plugging airbag 20 to move towards the inner cavity of the water supply pipe 1; at the same time, drive the protection cylinder 24 to move synchronously with the plugging airbag 20 by the second lifting oil cylinder 25;

[0093] S5.4: After the plugging airbag 20 completely enters the inner cavity of the water supply pipe 1, drive the protection cylinder 24 to retract into the first support cylinder 21 by the second lifting oil cylinder 25;

[0094] S5.5: Inflate the plugging airbag 20 through the air pipe 22 so that the plugging airbag 20 expands and plugs the inner cavity of the water supply pipe 1, restricting the water supply of the water supply pipe 1 to the damaged pipe section.

[0095] Drive the protection cylinder 24 to move synchronously with the plugging airbag 20 by the second lifting oil cylinder 25, so that the plugging airbag 20 can always be located inside the protection cylinder 24 during the process of moving towards the water supply pipe 1. The protection cylinder 24 is used to wrap and protect the plugging airbag 20, thereby effectively restricting the situation that the plugging airbag 20 is cut and damaged by the cut of the water supply pipe 1 when passing through the cut of the water supply pipe 1.

[0096] By arranging a number of water-permeable holes 240 at the closed end of the casing 24, when the casing 24 moves synchronously with the plugging airbag 20, the water in the water supply pipe 1 can enter and exit the casing 24 through the water-permeable holes 240, which is beneficial to reducing the resistance when the casing 24 moves.

[0097] S6: Pipe section replacement: Refer to Figure 9 and Figure 10 , the specific steps are as follows:

[0098] S6.1: Cut off and transfer the damaged pipe section, and reinstall the new pipe section in place;

[0099] S6.2: Connect the branch pipe on the new pipe section to the user water pipe.

[0100] S7: Connect the new pipe section to supply water: Refer to Figures 6 to 8 , remove the water cut-off device 2 on the two water cut-off interface pipes 12, block the water cut-off interface pipes 12, and supply water to the new pipe section by the water supply pipe 1.

[0101] The specific steps of step S7 are as follows:

[0102] S7.1: Release the gas in the plugging airbag 20 through the air pipe 22;

[0103] S7.2: Drive the casing 24 to move through the second lifting oil cylinder 25 until the casing 24 enters the inner cavity of the water supply pipe 1;

[0104] S7.3: Drive the air pipe 22 to drive the plugging airbag 20 to move upward through the first lifting oil cylinder 23 until the plugging airbag 20 enters the casing 24;

[0105] S7.4: Drive the plugging airbag 20 and the casing 24 to retract into the first support cylinder 21 synchronously through the first lifting oil cylinder 23 and the second lifting oil cylinder 25 respectively;

[0106] S7.5: Close the gate valve 13 on the water cut-off interface pipe 12 to block the water cut-off interface pipe 12;

[0107] S7.6: Remove the first support cylinder 21 from the gate valve 13.

[0108] When removing the water cut-off device 2, by first making the plugging airbag 20 enter the casing 24 and then making the plugging airbag 20 and the casing 24 retract into the first support cylinder 21 synchronously, it is beneficial to reduce the contact between the plugging airbag 20 and the cut of the water supply pipe 1 during the movement of the plugging airbag 20, resulting in the situation that the plugging airbag 20 is cut and scratched.

[0109] S8: Remove the temporary pipe 10: Refer to Figure 10 , block the water supply interface pipe 11 and remove the temporary pipe 10, and supply water to the new pipe section by the water supply pipe 1 alone; the specific steps are as follows:

[0110] S8.1: Close the gate valve 13 on the water supply interface pipe 11;

[0111] S8.2: Disconnect the temporary pipe 10 from the user water pipe;

[0112] S8.3: Disconnect the temporary pipe 10 from the gate valve 13 on the water supply interface pipe 11;

[0113] S8.4: Remove the temporary pipe 10.

[0114] S9: Refer to Figures 11 to 12 , and install a sealing plate 30 on the interface flange 14 of both the water supply interface pipe 11 and the water cut-off interface pipe 12 through the seal installation device 3 to seal the interface flange 14.

[0115] The outer contour of the sealing plate 30 is adapted to the inner circumferential contour of the interface flange 14. A plurality of threaded holes 141 are provided on the outer circumference of the interface flange 14; the plurality of threaded holes 141 are evenly distributed around the axis direction of the interface flange 14; and the threaded holes 141 communicate with the inner circumference of the interface flange 14; stud bolts 142 are threadedly connected in the threaded holes 141. A support ring 143 is coaxially welded to the bottom of the inner circumference of the interface flange 14, and the support ring 143 is used for the sealing plate 30 to abut against to support and position the sealing plate 30. When the sealing plate 30 abuts against the support ring 143, the outer circumference of the sealing plate 30 is opposite to the plurality of threaded holes 141 on the inner circumference of the interface flange 14.

[0116] The seal installation device 3 includes a second support cylinder 31, one end of the second support cylinder 31 is open and the other end is blocked. A second connecting flange 311 is coaxially connected to the end of the open end of the second support cylinder 31. A driving rod 32 is coaxially supported in the second support cylinder 31; one end of the driving rod 32 is threadedly connected to the sealing plate 30. The driving rod 32 away from the sealing plate 30 passes through the closed end of the second support cylinder 31, and a holding handle 321 is further connected to the end of the driving rod 32 away from the sealing plate 30.

[0117] The specific steps of step S9 are as follows:

[0118] S9.1: Installation of the seal installation device 3: Fix the second connecting flange 311 at the open end of the second support cylinder 31 to the end flange of the gate valve 13;

[0119] S9.2: Open the gate valve 13;

[0120] S9.3: Move the driving rod 32 in the direction towards the interface flange 14 of the water cut-off interface pipe 12 until the sealing plate 30 connected to the end of the driving rod 32 is moved into the interface flange 14 and abuts against the support ring 143;

[0121] S9.4: Turn the stud 142 in the threaded hole 141 on the outer circumference of the interface flange 14 until the stud 142 abuts against the outer circumference of the sealing plate 30;

[0122] S9.5: Retract the drive rod 32 into place: Rotate the drive rod 32 until the drive rod 32 separates from the sealing plate 30;

[0123] S9.6: Remove the seal installation device 3: Remove the second support cylinder 31 from the gate valve 13.

[0124] Through the cooperation of a number of studs 142 on the interface flange 14 and the sealing plate 30, the temporary plugging of the interface flange 14 is realized, which facilitates the removal of the gate valve 13 from the interface flange 14 and is conducive to the reuse of the gate valve 13.

[0125] By circumferentially arranging a support ring 143 on the inner circumference of the interface flange 14, when the sealing plate 30 is subsequently inserted into the inner circumference of the interface flange 14 by lowering the drive rod 32, the support ring 143 can support and position the sealing plate 30 inserted into the inner circumference of the interface flange 14, so that the sealing plate 30 can be accurately moved into the inner circumference of the interface flange 14, enabling the stud 142 to better abut against the outer circumference of the sealing plate 30.

[0126] By threadedly connecting the end of the drive rod 32 to the sealing plate 30, on the one hand, when installing the sealing plate 30 into the interface flange 14, the drive rod 32 can stably drive the sealing plate 30 to move. On the other hand, after the sealing plate 30 is fixed in the interface flange 14 by a number of studs 142 on the interface flange 14, the drive rod 32 can be separated from the sealing plate 30 by rotating the drive rod 32, facilitating the recovery and removal of the drive rod 32.

[0127] S10: Refer to Figures 13 to 14 , remove the gate valve 13 on the interface flanges 14 of both the water supply interface pipe 11 and the water cut-off interface pipe 12;

[0128] S11: Install a fixed flange cover 4 at the end of the interface flange 14.

[0129] During the replacement of the damaged pipe section of the water supply pipe 1 in this application, the water supply pipe 1 does not need to be shut down for treatment, effectively reducing the impact of the pipe section replacement construction on the normal production and life of the surrounding residents. Moreover, the new pipe section is reinstalled in place of the original damaged pipe section, effectively reducing the overall excavation workload of the construction, facilitating better saving of construction time and reducing the overall construction cost.

[0130] The above are all the preferred embodiments of this application. The protection scope of this application is not limited by this. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A construction method for replacing a water supply pipeline without stopping water, characterized in that: The following steps are involved: S1: Temporary pipe (10) in place: a temporary pipe (10) is laid on the ground next to the damaged pipe section of the water supply pipe (1); S2: Interface pipe installation: welding and installing a water supply interface pipe (11) and a water cut-off interface pipe (12) on the normal pipe sections at both ends of the damaged pipe section of the water supply pipe (1), wherein the water cut-off interface pipe (12) is arranged close to the damaged pipe section of the water supply pipe (1); S3: Pipeline drilling: drilling holes in the water supply pipe (1) through a drilling device on the water supply interface pipe (11) and the water cut-off interface pipe (12), so that the water supply interface pipe (11) and the water cut-off interface pipe (12) are both connected to the water supply pipe (1); S4: temporary pipe (10) connection construction: the two ends of the temporary pipe (10) are respectively connected to the water supply interface pipes (11) at the two ends of the damaged pipe section of the water supply pipe (1), so that the damaged pipe section of the water supply pipe (1) and the temporary pipe (10) can supply water simultaneously; S5: Damaged pipe section plugging treatment: installing water cut-off devices (2) on the water cut-off interface pipes (12) at both ends of the damaged pipe section of the water supply pipe (1), and using the water cut-off devices (2) to cut off and plug the two ends of the damaged pipe section of the water supply pipe (1); S6: Pipe segment replacement: remove the damaged pipe segment and reinstall the new pipe segment in situ; S7: connecting the new pipe section to water: removing the water cut-off devices (2) on the two water cut-off interface pipes (12), and sealing the water cut-off interface pipes (12), and supplying water to the new pipe section through the water supply pipe (1); S8: Removal of the temporary pipe (10): plugging the water supply interface pipe (11) and removing the temporary pipe (10), and supplying water to the new pipe section solely through the water supply pipe (1); The water supply interface pipe (11) and the water cut-off interface pipe (12) are both coaxially connected with an interface flange (14) at one end away from the water supply pipe (1); In step S2, after the water supply interface pipe (11) and the water cut-off interface pipe (12) are welded to the normal pipe section of the water supply pipe (1), the gate valve (13) is installed on the interface flanges (14) of the water supply interface pipe (11) and the water cut-off interface pipe (12); In step S3: after the water supply interface pipe (11) and the water cut-off interface pipe (12) are perforated in the water supply pipe (1) by the perforating device, the water supply interface pipe (11) and the water cut-off interface pipe (12) are respectively blocked by gate valves (13) installed on both the water supply interface pipe (11) and the water cut-off interface pipe (12); The water cut-off device (2) comprises a first support tube (21), one end of the first support tube (21) is open and the other end is closed; a first connecting flange (211) is coaxially arranged at the open end of the first support tube (21), a blocking airbag (20) is also arranged inside the first support tube (21), the blocking airbag (20) is connected to an air pipe (22), and the air pipe (22) is coaxially penetrated through the closed end of the first support tube (21); the first support tube (21) is provided with a first lifting drive member corresponding to the air pipe (22), the first lifting drive member is drivingly connected to the air pipe (22), and is used to drive the air pipe (22) to drive the blocking airbag (20) to move radially along the first support tube (21); In step S2, the water supply pipe (1) is subjected to water cut-off treatment by means of the water cut-off device (2), and after the first connecting flange (211) at the open end of the first support tube (21) is connected to the end flange of the gate valve (13) on the water cut-off interface pipe (12), the air pipe (22) is driven by the first lifting drive member to drive the blocking airbag (20) to move along the radial direction of the first support tube (21) toward the water supply pipe (1) until the blocking airbag (20) passes through the incision between the gate valve (13) and the water supply pipe (1) and enters the water supply pipe (1); air is inflated into the blocking airbag (20) through the air pipe (22) so that the blocking airbag (20) expands and blocks the inner cavity of the water supply pipe (1).

2. The method for replacing a water supply pipeline without stopping water supply according to claim 1, characterized in that: A protective tube (24) is coaxially supported in the first support tube (21), one end of the protective tube (24) is open and the other end is closed, the open end of the protective tube (24) is close to the open end of the first support tube (21), the blocking airbag (20) is located in the protective tube (24), and the trachea (22) is coaxially penetrated through the closed end of the protective tube (24); the first support tube (21) is provided with a second lifting drive member corresponding to the protective tube (24), the second lifting drive member is drivingly connected to the protective tube (24) and is used to drive the protective tube (24) to move radially along the first support tube (21); In step S2, when the blocking airbag (20) is driven by the first lifting drive member to move radially toward the water supply pipe (1) along the first support tube (21), the protective tube (24) is driven by the second lifting drive member to move synchronously with the blocking airbag (20); after the blocking airbag (20) completely enters the inner cavity of the water supply pipe (1), the protective tube (24) is driven by the second lifting drive member to retract into the first support tube (21).

3. The method for replacing a water supply pipeline without stopping water supply according to claim 1, characterized in that: The following steps are also included: S9: Installing a sealing plate (30) on the interface flanges (14) of the water supply interface pipe (11) and the water cutoff interface pipe (12) by means of a sealing member installation device (3) to seal the interface flanges (14); S10: Remove the gate valves (13) on the water supply interface pipe (11) and the water cutoff interface pipe (12); S11: Install the fixed flange cover (4) at the end of the interface flange (14).

4. The method for replacing a water supply pipeline without stopping water supply according to claim 3, characterized in that: The interface flange (14) is provided with threaded holes (141) around its outer periphery, and the threaded holes (141) are all connected to the inner periphery of the interface flange (14); and studs (142) are threadedly connected in the threaded holes (141); The specific steps of step S9 are as follows: S9.1: Install the seal mounting device (3) at the end flange of the gate valve (13); S9.2: Open the gate valve (13), and insert the sealing plate (30) for sealing the interface flange (14) into the inner circumference of the interface flange (14) through the sealing member installation device (3); S9.3: Tighten the studs (142) on the outer periphery of the interface flange (14) until the studs (142) are tightly pressed against the outer periphery of the sealing plate (30) in the interface flange (14), so as to temporarily seal the interface flange (14) through the sealing plate (30); S9.4: Remove the seal mounting device (3) from the gate valve (13).

5. The method for replacing a water supply pipeline without stopping water supply according to claim 4, characterized in that: The sealing member installation device (3) comprises a second support tube (31), wherein one end of the second support tube (31) is open and the other end is closed; the open end of the second support tube (31) is coaxially connected to a second connecting flange (311); a driving rod (32) is coaxially supported inside the second support tube (31); one end of the driving rod (32) is inserted into the closed end of the second support tube (31), and the other end of the driving rod (32) is threadedly connected to the sealing plate (30); In step S9.2, the second connecting flange (311) at the open end of the second support tube (31) is connected to the flange end of the gate valve (13); after the gate valve (13) is opened, the driving rod (32) is moved radially along the second support tube (31) toward the water supply pipe (1) until the sealing plate (30) moves to the inner periphery of the interface flange (14); In step S9.3, after the stud (142) is tightly pressed against the outer periphery of the sealing plate (30), the driving rod (32) is rotated to separate the driving rod (32) from the sealing plate (30).

6. A construction method for replacing a water supply pipeline without stopping water supply according to claim 5, characterized in that: A support ring (143) is coaxially connected to the inner circumference of the interface flange (14), and the support ring (143) is used for abutting against the sealing plate (30); When the bottom of the sealing plate (30) abuts against the supporting ring (143), the threaded hole (141) is arranged opposite to the outer periphery of the sealing plate (30).

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