A non-powered, high-flow-rate siphon drainage auxiliary device and method for main pipelines

Abstract

This invention provides a non-powered, high-flow-rate siphon drainage auxiliary device and method for main pipelines, including a drainage pipe. One end of the drainage pipe is bent to form an outlet pipe, which extends into the interior of an outlet well. The other end of the drainage pipe is bent to form an inlet pipe, which extends into the interior of an inlet well. Both ends of the pipe section to be inspected and repaired between the outlet well and the inlet well are sealed by a sealing device. An exhaust device for venting is installed on the drainage pipe. A water storage tank is located at the bottom of the inlet well, directly below the inlet pipe. This device utilizes the siphon effect to achieve drainage with almost no energy consumption, and it offers large drainage capacity, convenient installation, low maintenance workload, and low drainage cost.

Description

Technical Field

[0001] This invention relates to the field of municipal engineering, specifically to a non-powered, high-flow-rate siphon drainage auxiliary device and method for main pipelines. Background Technology

[0002] During the operation of sewage pipe networks, some defects inevitably occur. The detection and repair of these defects generally require dewatering operations. In order not to affect the operation of the sewage system, the sewage upstream of the section to be inspected and repaired needs to be diverted downstream during dewatering operations. However, the sewage flow in the main pipe is generally large, requiring large-scale diversion equipment, which leads to high diversion costs, and there are even cases where the existing diversion equipment cannot meet the diversion requirements. Summary of the Invention

[0003] To solve the above technical problems, the present invention provides a non-powered high-flow siphon drainage auxiliary device and method for main pipelines. This device can achieve drainage with almost no energy consumption by utilizing the siphon effect, and has a large drainage capacity, is easy to install, requires little maintenance, and has low drainage cost.

[0004] To achieve the above-mentioned technical features, the present invention aims to provide a main pipe non-powered high-flow siphon drainage auxiliary device, comprising a drainage pipe, one end of which is bent to form an outlet pipe extending into the interior of an outlet well, and the other end of which is bent to form an inlet pipe extending into the interior of an inlet well; both ends of the pipe section to be inspected and repaired between the outlet well and the inlet well are sealed by a sealing device; an exhaust device for venting is installed on the drainage pipe; and a water storage tank is provided at the bottom of the inlet well and directly below the inlet pipe.

[0005] The guide pipe is a transparent flexible tube with steel wire embedded inside, and the diameter of the guide pipe is smaller than the inner diameter of the outlet well and the inlet well; the guide pipe can be extended as needed, and the joint is sealed to prevent air leakage.

[0006] The outlet well and inlet well are inspection wells selected from different locations. The specific selection of outlet well and inlet well is based on the location of the pipe section to be inspected and repaired that actually needs to be inspected and repaired.

[0007] The sealing device includes an upstream airbag and a downstream airbag. The upstream airbag is located downstream of the outlet well, and the downstream airbag is located upstream of the inlet well.

[0008] The exhaust device is installed on a section of lightweight, corrosion-resistant metal pipe. Both sides of the metal pipe are connected to the guide pipe, and the interface is sealed to prevent air leakage. The exhaust device has a large exhaust volume, which can quickly remove the air in the guide pipe. The exhaust device is equipped with a probe that automatically monitors the liquid level in the guide pipe. When the liquid level is lower than the set value, the exhaust device can automatically start.

[0009] The water storage tank is an inverted frustum-shaped hollow container without a lid. The bottom surface of the water storage tank is smaller than the cross-section of the inlet well. The bottom surface has high strength and is not easily deformed. Two or three circular rings are symmetrically arranged at a certain angle on the bottom surface so that a long rod can be used to place the water storage tank into the inlet well and fix it.

[0010] The sides of the water tank are made of a flexible material that can deform when subjected to external force. At least three tightening rings are symmetrically arranged at certain angles on the upper part of the side. Tightening ropes are threaded through the tightening rings, which can tighten the upper opening of the water tank for easy removal. After the tightening ropes are released, the sides of the water tank can be unfolded.

[0011] The method for siphon drainage using the aforementioned auxiliary equipment for non-powered high-flow siphon drainage of main pipelines includes the following steps:

[0012] Step 1: In advance, consult and communicate with the operating unit to schedule the influent pumps of upstream and downstream pumping stations or sewage treatment plants in advance to lower the water level of the pipe section to be inspected and repaired and the upstream and downstream sections, so as to buy more time for subsequent pump shutdown.

[0013] Step 2: Based on the sewage pipeline topology diagram and on-site survey analysis, determine the outlet and inlet wells of the drainage system, and determine the sealing locations;

[0014] Step 3: Select a suitable diameter conduit pipe, lay the conduit pipe and exhaust device on the ground, and assemble them. Seal the joints to prevent air leakage, and make sure to leave room for subsequent operations.

[0015] Step 4: Notify the operating unit to temporarily shut down the upstream and downstream pumping stations or the inlet pumps of the sewage treatment plant to make the water flow in the sewage pipeline more gradual.

[0016] Step 5: Install the sealing device to complete the sealing process.

[0017] First, install the upstream airbag and inflate it; then install the downstream airbag and inflate it; finally, use ropes to pull and fix the upstream and downstream airbags to complete the sealing of the pipe section to be inspected and repaired.

[0018] Step 6: Place the water storage tank.

[0019] Use multiple long rods with hooks to hook onto the rings on the water storage tank, and place the water storage tank at the bottom of the inlet well. Set up fixed brackets at or around the well opening of the inlet well to fix the long rods, thereby fixing the water storage tank. Loosen the tightening rope on the water storage tank to allow the water storage tank to unfold.

[0020] Step 7: Install the corresponding outlet pipe and inlet pipe in the outlet well and inlet well, and connect them to the drainage pipe laid on the ground. The interface should be sealed to prevent air leakage. Special attention should be paid to ensuring that the inlet of the inlet pipe in the inlet well is lower than the side of the water storage tank, so that the inlet of the inlet pipe is submerged in the water in the water storage tank. At the same time, it should be a certain distance from the bottom of the water storage tank to avoid obstruction of water flow from the inlet of the inlet pipe.

[0021] Step 8: Due to the shutdown of the upstream and downstream pumping stations or sewage treatment plant influent pumps, the water level in the pipeline is already very high. The water in the outlet well submerges the outlet pipe opening, and the water in the inlet well submerges the inlet pipe opening and the water storage tank. Furthermore, the upstream water level is higher than the downstream water level, meaning the water level in the outlet well is higher than the water level in the inlet well. The venting device is then activated to expel the air from the drainage pipe. As the air is expelled, the water level in the drainage pipe continues to rise. When the water level exceeds the elevation of the highest point of the drainage pipe bottom, the water begins to flow through the drainage pipe from the outlet well into the downstream inlet well. The venting device continues to vent until the air in the drainage pipe is basically exhausted, and the drainage pipe is full of drainage. At this point, the venting device is turned off. As drainage continues, some air will inevitably mix into the drainage pipe. When the amount of air in the drainage pipe increases and the water level drops to the set position, the venting device will automatically start venting until the air in the pipe is basically exhausted, and the drainage pipe is full of drainage. The venting device will then be turned off again. If the water level in the outlet well and inlet well does not meet the above requirements, the venting device can only be turned on after the water level meets the above requirements.

[0022] Step 9: Start the upstream and downstream pumping stations or the influent pumps of the sewage treatment plant. The downstream pumping station should be operated at full capacity as much as possible to reduce the water level in the inlet well to the greatest extent. The upstream pumping station should be started gradually. The water level in the outlet well should be increased as much as possible without causing the upstream pipeline to overflow, so as to maximize the liquid level difference between the outlet well and the inlet well and maximize the discharge capacity.

[0023] Step 10: When the upstream water flow decreases, the water level in the outlet well also gradually decreases, the liquid level difference between the outlet well and the inlet well decreases, and the drainage volume also decreases; when the upstream water flow increases, the water level in the outlet well also gradually rises, the liquid level difference between the outlet well and the inlet well increases, and the drainage volume also increases.

[0024] Step 11: After carrying out step 8, we can begin dewatering and inspection / repair work on the pipe section to be inspected and repaired.

[0025] Step 12: After the dewatering and inspection and repair work of the pipeline section to be inspected and repaired is completed, remove the drainage pipe; tighten the rope of the water storage tank and remove the water storage tank with a long pole; deflate and remove the airbags on the upstream and downstream sides.

[0026] In step three, if there are steps in the outlet well and the inlet well, remove the steps to facilitate the installation of a larger diameter guide pipe.

[0027] The presence of the water storage tank ensures that the inlet of the inlet pipe in the inlet well is always submerged, regardless of changes in the downstream water level, thus acting as a water seal to prevent a large amount of air from entering the drainage pipe and causing the drainage to be interrupted, thereby enabling the drainage auxiliary equipment to achieve stable and continuous drainage.

[0028] If long-term drainage is required, a semi-blocking wall of a certain height should be built at the downstream pipe opening of the inlet well to replace the water storage tank. The water level in the inlet well is maintained by the blocking wall, so that the pipe opening of the inlet pipe in the inlet well is always buried and plays a water seal role, and the flow of the pipeline will not be significantly affected.

[0029] The beneficial effects of this invention are as follows:

[0030] 1. The device of this invention utilizes the siphon effect to achieve drainage with almost no energy consumption, and has a large drainage capacity, is easy to install, requires little maintenance, and has low drainage cost.

[0031] 2. The water storage tank ensures that the inlet pipe in the inlet well remains submerged regardless of downstream water level changes, acting as a water seal to prevent excessive air from entering the drainage pipe and interrupting drainage. This, in turn, allows the drainage auxiliary equipment to achieve stable and continuous drainage.

[0032] 3. The aforementioned drainage pipe can be used for drainage and can be lengthened as needed.

[0033] 4. The arrangement of the above-mentioned outlet wells and inlet wells facilitates the formation of a waterless environment inside the pipe section to be inspected and repaired.

[0034] 5. The sealing device facilitates sealing at both ends of the pipe section to be inspected and repaired.

[0035] 6. The exhaust device facilitates the exhaust of air from the guide pipe, thereby facilitating the formation of a siphon.

[0036] 7. The aforementioned water storage tank facilitates its lowering into the inlet well. Attached Figure Description

[0037] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0038] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0039] In the diagram: 1. Upstream airbag, 2. Outlet well, 3. Outlet pipe, 4. Upstream pipeline, 5. Pipe section to be inspected and repaired, 6. Downstream airbag, 7. Water tank, 8. Exhaust device, 9. Drainage pipe, 10. Inspection well, 11. Inlet well, 12. Inlet pipe, 13. Downstream pipeline. Detailed Implementation

[0040] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0041] Example 1:

[0042] Please see Figure 1 A non-powered, high-flow-rate siphon drainage auxiliary device for main pipelines includes a drainage pipe 9. One end of the drainage pipe 9 is bent to form an outlet pipe 3, which extends into the interior of an outlet well 2. The other end of the drainage pipe 9 is bent to form an inlet pipe 12, which extends into the interior of an inlet well 11. Both ends of the pipe section 5 to be inspected and repaired between the outlet well 2 and the inlet well 11 are sealed by a sealing device. An exhaust device 8 for venting is installed on the drainage pipe 9. A water storage tank 7 is located at the bottom of the inlet well 11, directly below the inlet pipe 12. By employing the above-mentioned drainage auxiliary device, drainage can be achieved with almost no energy consumption through the siphon effect. It also offers large drainage capacity, convenient installation, low maintenance workload, and low drainage cost. In specific operation, it utilizes the liquid level difference between the outlet well 2 and the inlet well 11, and vents air using the exhaust device 8, ultimately forming a siphon effect to achieve the drainage effect.

[0043] Furthermore, the guide pipe 9 is a transparent flexible tube with steel wire embedded inside, and the diameter of the guide pipe 9 is smaller than the inner diameter of the outlet well 2 and the inlet well 11; the guide pipe 9 can be lengthened as needed, and the joint is sealed to prevent air leakage. The guide pipe 9 described above can be used for drainage and can be lengthened as needed.

[0044] Furthermore, the outlet well 2 and inlet well 11 are inspection wells located at different positions. The specific selection of outlet well 2 and inlet well 11 is based on the location of the pipe section 5 to be inspected and repaired. Through the above-mentioned arrangement of outlet well 2 and inlet well 11, it is possible to facilitate the formation of a waterless environment inside the pipe section 5 to be inspected and repaired.

[0045] Furthermore, the sealing device includes an upstream airbag 1 and a downstream airbag 6. The upstream airbag 1 is positioned downstream of the location of the outlet well 2, and the downstream airbag 6 is positioned upstream of the location of the inlet well 11. The sealing device facilitates the sealing of both ends of the pipe section 5 to be inspected and repaired.

[0046] Furthermore, the exhaust device 8 is installed on a section of lightweight, corrosion-resistant metal pipe, with both sides of the metal pipe connected to the guide pipe 9, and the interfaces are sealed to prevent air leakage. The exhaust device 8 has a large exhaust volume, which can quickly remove the air from the guide pipe 9. The exhaust device 8 is equipped with a probe that automatically monitors the liquid level in the guide pipe 9, and can automatically start the exhaust when the liquid level is lower than a set value. The exhaust device 8 facilitates the exhaust of the guide pipe 9, thereby facilitating the formation of a siphon.

[0047] Furthermore, the water storage tank 7 is an inverted frustum-shaped hollow, lidless container. The bottom surface of the water storage tank 7 is smaller than the cross-section of the inlet well 11, and the bottom surface has high strength and is not easily deformed. Two or three circular rings are symmetrically arranged at certain angles on the bottom surface so that a long rod can be used to place the water storage tank 7 into the inlet well 11 and fix it. The water storage tank 7 described above facilitates its lowering into the inlet well 11.

[0048] Furthermore, the sides of the water storage tank 7 are made of a flexible material that can deform when subjected to external force. At least three tightening rings are symmetrically arranged at certain angles on the upper part of the side, and tightening ropes are threaded through the tightening rings. The upper opening of the water storage tank 7 can be tightened by tightening ropes so that it can be taken out. After the tightening ropes are loosened, the sides of the water storage tank 7 can be unfolded.

[0049] Example 2:

[0050] A method for siphon drainage using a non-powered, high-flow-rate siphon drainage auxiliary device for a main pipeline includes the following steps:

[0051] Step 1: In advance, consult and communicate with the operating unit to lower the water level of the pipe section to be inspected and repaired and the upstream and downstream sections by scheduling the influent pumps of the upstream and downstream of the upstream and downstream pumps of the sewage treatment plant in advance, so as to buy more time for subsequent pump shutdown.

[0052] Step 2: Based on the sewage pipeline topology diagram and on-site survey analysis, determine the outlet well 2 and inlet well 11 of the drainage system, and determine the sealing location;

[0053] Step 3: Select a suitable diameter guide pipe 9, lay the guide pipe 9 and exhaust device 8 on the ground, and assemble them. Seal the joints to prevent air leakage, and pay attention to leaving operating space for subsequent operations.

[0054] Step 4: Notify the water plant operator to temporarily shut down the upstream and downstream pumping stations or the sewage treatment plant inlet pumps to make the water flow in the sewage pipes more gradual.

[0055] Step 5: Install the sealing device to complete the sealing process.

[0056] First, install the upstream airbag 1 and inflate it; then install the downstream airbag 6 and inflate it; use ropes to pull and fix the upstream airbag 1 and the downstream airbag 6, and finally complete the sealing of the pipe section 5 to be tested and repaired.

[0057] Step 6, place the water storage tank 7:

[0058] Use multiple long rods with hooks to hook the rings on the water storage tank 7, and place the water storage tank at the bottom of the inlet well 11. Set up fixed brackets at the wellhead or around the inlet well 11 to fix the long rods, thereby fixing the water storage tank 7. Loosen the tightening rope on the water storage tank 7 to allow the water storage tank 7 to unfold.

[0059] Step 7: Install outlet pipe 3 and inlet pipe 12 in outlet well 2 and inlet well 11 respectively, and connect them to the drainage pipe 9 laid on the ground. The interface should be sealed to prevent air leakage. Special attention should be paid to ensuring that the inlet of inlet pipe 12 in inlet well 11 is lower than the side of water storage tank 7, so that the inlet of inlet pipe 12 is submerged in water in water storage tank. At the same time, it should be a certain distance from the bottom of water storage tank to avoid obstruction of water flow from the inlet of inlet pipe 12.

[0060] Step 8: Due to the upstream and downstream pumping stations or sewage treatment plant influent pumps, the water level in the pipeline is already very high. The water in outlet well 2 submerges the inlet of outlet pipe 3, and the water in inlet well 11 submerges the inlet of inlet pipe 12 and the water storage tank 7. Furthermore, the upstream water level is higher than the downstream water level, meaning the water level in outlet well 2 is higher than the water level in inlet well 11. The venting device 8 is activated to expel the air from the drainage pipe 9. As the air is expelled, the water level in drainage pipe 9 continues to rise. When the water level exceeds the bottom elevation of the drainage pipe, water begins to flow through the drainage pipe from outlet well 2 into the downstream drainage well. When entering well 11, the venting device 8 continues to vent until the air in the guide pipe 9 is basically exhausted, and the guide pipe 9 is fully vented. At this point, the venting device 8 is closed. As venting continues, some air will inevitably mix into the guide pipe. When the amount of air in the guide pipe increases and causes the water level to drop, the venting device is restarted to vent until the air in the pipe is basically exhausted, and the guide pipe is fully vented. The venting device is then closed again. If the water level in the outlet well 2 and the inlet well 11 does not meet the above requirements, the venting device 8 can only be opened after the water level meets the above requirements.

[0061] Step 9: Start the pumps of the upstream and downstream pumping stations. The downstream pumping station should be operated at full load as much as possible to reduce the water level of the inlet well 11 to the greatest extent. The upstream pumping station should be started gradually. The water level of the outlet well 2 should be increased as much as possible without causing the upstream pipeline to overflow, so as to maximize the liquid level difference between the outlet well 2 and the inlet well 11 and maximize the discharge capacity.

[0062] Step 10: When the upstream water flow decreases, the water level in outlet well 2 gradually decreases, the liquid level difference between outlet well 2 and inlet well 11 decreases, and the drainage volume also decreases; when the upstream water flow increases, the water level in outlet well 2 gradually rises, the liquid level difference between outlet well 2 and inlet well 11 increases, and the drainage volume also increases.

[0063] Step 11: During step 8, dewatering and inspection / repair work can be carried out on the pipe section 5 to be inspected and repaired.

[0064] Step 12: After the dewatering and inspection and repair work of the pipeline section to be inspected and repaired is completed, remove the drainage pipe 9; tighten the tightening rope of the water storage tank 7 and remove the water storage tank through the long pole; deflate the upstream airbag 1 and the downstream airbag 6 and remove them.

[0065] In step three, if there are steps in the outlet well 2 and the inlet well 11, the steps are removed to facilitate the installation of a larger diameter guide pipe 9.

[0066] The presence of the water storage tank 7 ensures that the inlet of the inlet pipe 12 in the inlet well 11 is always submerged, regardless of the changes in the downstream water level, thus playing a water seal role and preventing a large amount of air from entering the drainage pipe and causing the drainage to be interrupted, thereby enabling the drainage auxiliary equipment to achieve stable and continuous drainage.

[0067] If long-term drainage is required, a semi-blocking wall of a certain height is built at the downstream pipe opening of the inlet well 11 to replace the water storage tank 7. The water level in the inlet well 11 is maintained by the blocking wall, so that the pipe opening of the inlet pipe 12 in the inlet well 11 is always buried and plays a water seal role, and will not significantly affect the flow of the pipeline.

Claims

1. A non-powered, high-flow-rate siphon drainage auxiliary device for main pipelines, characterized in that, The system includes a guide pipe (9), with one end of the guide pipe (9) bent to form an outlet pipe (3), which extends into the outlet well (2). The other end of the guide pipe (9) is bent to form an inlet pipe (12), which extends into the inlet well (11). The two ends of the pipe section (5) to be inspected and repaired between the outlet well (2) and the inlet well (11) are sealed by a sealing device. An exhaust device (8) for exhausting air is installed on the guide pipe (9). A water storage tank (7) is provided at the bottom of the inlet well (11) and directly below the inlet pipe (12). The guide pipe (9) is a transparent flexible tube with steel wire embedded inside, and the diameter of the guide pipe (9) is smaller than the inner diameter of the outlet well (2) and the inlet well (11); The exhaust device (8) has a large exhaust volume, which can quickly remove the air in the guide pipe (9). The exhaust device (8) is equipped with a probe that automatically monitors the liquid level in the guide pipe (9). When the liquid level is lower than the set value, the exhaust can be automatically turned on. The water storage tank (7) is an inverted frustum-shaped hollow container without a lid.

2. The auxiliary equipment for a main pipeline without power and with a large flow rate siphon drainage system according to claim 1, characterized in that, The guide pipe (9) can be extended as needed, and the interface is sealed to prevent air leakage.

3. The auxiliary device for a main pipeline without power and with a large flow rate siphon drainage as described in claim 2, characterized in that, The outlet well (2) and the inlet well (11) are inspection wells selected from different locations. The specific selection of outlet well (2) and inlet well (11) is based on the location of the pipe section (5) to be inspected and repaired that actually needs to be inspected and repaired.

4. The auxiliary device for a main pipeline without power and with a large flow rate siphon drainage as described in claim 1, characterized in that, The sealing device includes an upstream airbag (1) and a downstream airbag (6). The upstream airbag (1) is located downstream of the outlet well (2), and the downstream airbag (6) is located upstream of the inlet well (11).

5. The auxiliary device for a main pipeline with non-powered high-flow siphon drainage according to claim 1, characterized in that, The exhaust device (8) is installed on a section of lightweight, corrosion-resistant metal pipe. Both sides of the metal pipe are connected to the exhaust pipe (9), and the interface is sealed to prevent air leakage.

6. The auxiliary device for a main pipeline with non-powered high-flow siphon drainage according to claim 1, characterized in that, The bottom surface of the water storage tank (7) is smaller than the cross-section of the inlet well (11). The bottom surface has high strength and is not easily deformed. Two or three circular rings are symmetrically arranged at a certain angle on the bottom surface so that the water storage tank (7) can be placed in the inlet well (11) and fixed by using a long rod.

7. The auxiliary device for a main pipeline without power and with a large flow rate siphon drainage as described in claim 6, characterized in that, The side of the water tank (7) is made of flexible material and can deform when subjected to external force. At least three tightening rings are symmetrically arranged at a certain angle on the upper part of the side. Tightening ropes are threaded on the tightening rings, which can tighten the upper opening of the water tank (7) so that it can be taken out. After the tightening ropes are loosened, the side of the water tank (7) can be unfolded.

8. A method for siphon drainage using the auxiliary equipment for non-powered high-flow siphon drainage of a main pipeline as described in any one of claims 1-7, characterized in that, Includes the following steps: Step 1: In advance, consult and communicate with the operating unit to schedule the influent pumps of upstream and downstream pumping stations or sewage treatment plants in advance to lower the water level of the pipe section to be inspected and repaired (5) and the upstream and downstream, so as to buy more time for subsequent pump shutdown. Step 2: Based on the sewage pipeline topology diagram and on-site survey analysis, determine the outlet well (2) and inlet well (11) of the drainage system, and determine the sealing location; Step 3: Select a suitable diameter guide pipe (9), lay the guide pipe (9) and exhaust device (8) on the ground, and assemble them. Seal the joints to prevent air leakage, and pay attention to leaving room for subsequent operations. Step 4: Notify the operating unit to temporarily shut down the upstream and downstream pumping stations or the inlet pumps of the sewage treatment plant to make the water flow in the sewage pipeline more gradual. Step 5: Install the sealing device to complete the sealing process. First, install the upstream side airbag (1) and inflate it; then install the downstream side airbag (6) and inflate it; use ropes to pull and fix the upstream side airbag (1) and the downstream side airbag (6) to complete the sealing of the pipe section (5) to be tested and repaired. Step 6, place the water storage tank (7): Use multiple long rods with hooks to hook the rings on the water storage tank (7) and place the water storage tank at the bottom of the inlet well (11). Set up a fixed bracket at the wellhead or around the inlet well (11) to fix the long rods, thereby fixing the water storage tank (7). Loosen the tightening rope on the water storage tank (7) to allow the water storage tank (7) to unfold. Step 7: Install outlet pipe (3) and inlet pipe (12) in outlet well (2) and inlet well (11) respectively, and connect them to the drainage pipe (9) laid on the ground. The interface should be sealed to prevent air leakage. Special attention should be paid to ensuring that the pipe opening of inlet pipe (12) in inlet well (11) is lower than the side of water storage tank (7) to ensure that the pipe opening of inlet pipe (12) is submerged in water in water storage tank. At the same time, it should be a certain distance from the bottom of water storage tank to avoid poor water flow from the pipe opening of inlet pipe (12). Step 8: Due to the shutdown of the upstream and downstream pumping stations or sewage treatment plant influent pumps, the water level in the pipeline is already very high. The water in the outlet well (2) submerges the outlet pipe (3) opening, and the water in the inlet well (11) submerges the inlet pipe (12) opening and the water storage tank (7). Moreover, the upstream water level is higher than the downstream water level, that is, the water level in the outlet well (2) is higher than the water level in the inlet well (11). The venting device (8) is turned on to expel the air in the drainage pipe (9). As the air is expelled, the water level in the drainage pipe (9) continues to rise. When the water level is higher than the elevation of the bottom of the highest drainage pipe, the water begins to flow through the drainage pipe from the outlet well (2) into the pipeline. Downstream inlet well (11), the venting device (8) continues to vent until the air in the drainage pipe (9) is basically exhausted and the drainage pipe (9) is fully drained. At this time, the venting device (8) is closed. As the drainage continues, some air inevitably mixes into the drainage pipe. When the air in the drainage pipe increases and the water level drops to the set position, the venting device automatically starts to vent until the air in the pipe is basically exhausted and the drainage pipe is fully drained. The venting device is then closed again. If the water level in the outlet well (2) and inlet well (11) does not meet the above requirements, the venting device (8) can only be opened after the water level meets the above requirements. Step 9: Start the upstream and downstream pumping stations or the influent pumps of the sewage treatment plant. The downstream pumping station should be operated at full load as much as possible to reduce the water level in the inlet well (11) to the greatest extent. The upstream pumping station should be started gradually. The water level in the outlet well (2) should be increased as much as possible without causing the upstream pipeline to overflow, so as to maximize the liquid level difference between the outlet well (2) and the inlet well (11) and maximize the discharge volume. Step 10: When the upstream water flow decreases, the water level of the outlet well (2) also gradually decreases, the liquid level difference between the outlet well (2) and the inlet well (11) decreases, and the drainage volume also decreases; when the upstream water flow increases, the water level of the outlet well (2) also gradually rises, the liquid level difference between the outlet well (2) and the inlet well (11) increases, and the drainage volume also increases. Step 11: When carrying out step 8, the dewatering and inspection and repair construction of the pipe section (5) to be inspected and repaired can be carried out. Step 12: After the dewatering and inspection and repair work of the pipe section (5) is completed, remove the drainage pipe (9); tighten the rope of the water storage tank (7) and remove the water storage tank through the long pole; deflate the upstream airbag (1) and the downstream airbag (6) and remove them.

9. A method for siphon drainage using a non-powered, high-flow-rate siphon drainage auxiliary device for a main pipeline according to claim 8, characterized in that, In step three, if there are steps in the outlet well (2) and the inlet well (11), remove the steps to facilitate the installation of a larger diameter guide pipe (9).

10. The method for siphon drainage using a non-powered high-flow-rate siphon drainage auxiliary device for a main pipeline according to claim 8, characterized in that, The presence of the water storage tank (7) ensures that the inlet of the inlet pipe (12) in the inlet well (11) is always buried, regardless of the change in the downstream water level, thus playing a water seal role and preventing a large amount of air from entering the drainage pipe and causing the drainage to be interrupted, thereby enabling the drainage auxiliary equipment to achieve stable and continuous drainage. If long-term drainage is required, a semi-blocking wall of a certain height is built at the downstream pipe opening of the inlet well (11) to replace the water storage tank (7). The water level in the inlet well (11) is maintained by the blocking wall, so that the pipe opening of the inlet pipe (12) in the inlet well (11) is always buried and plays a water seal role, and will not significantly affect the flow of the pipeline.

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