Rainwater and sewage pipe dredging construction method

Abstract

The application discloses a rain and sewage pipeline dredging construction method, which comprises the following steps: firstly, surveying and mapping the upstream and downstream of the whole rain and sewage pipeline; secondly, adopting wall building to block the pipe openings at the head and tail of the dredging section; thirdly, carrying out pipeline dredging; fourthly, carrying out pipeline detection and acceptance; and finally, removing the wall. The method can ensure the diversion and drainage in the whole process while blocking, does not affect the normal operation and use, has high masonry efficiency, is safe in dredging, and can avoid the water level difference from washing away the diver when removing the wall, thereby ensuring the construction safety.

Description

Technical Field

[0001] This invention belongs to the field of municipal engineering construction technology, and specifically relates to a method for dredging stormwater and sewage pipes. Technical Background

[0002] Blockage in stormwater and sewage pipe networks is a significant factor contributing to water accumulation, thus requiring regular or timely dredging. Currently, dredging of stormwater and sewage pipes typically involves sealing the pipe openings with airbags or masonry walls. Using airbags for sealing presents the following problems: 1) Airbags are easily washed away by water; 2) When the pipe diameter is large, using large-volume pressurized airbags for sealing carries certain risks; 3) When pipe sections have structural defects such as deformation or misalignment, airbags are unlikely to achieve the desired water-blocking effect. Using masonry walls for sealing presents the following problems: 1) The masonry process poses safety hazards; 2) Since the drainage pipes are essentially in a water-filled state, sealing them after a blockage cannot effectively divert and drain large amounts of water or in other emergencies, affecting normal operation. Summary of the Invention

[0003] The purpose of this invention is to provide a method for dredging stormwater and sewage pipes. This method can ensure drainage throughout the entire process while sealing the pipes, without affecting normal operation and use. It has high construction efficiency, safe dredging, and can prevent divers from being swept away by water level differences when demolishing the wall, thus ensuring construction safety.

[0004] The technical solution adopted in this invention is:

[0005] A method for dredging stormwater and sewage pipes includes the following steps:

[0006] S1. Conduct a survey of the entire stormwater and sewage pipeline upstream and downstream to obtain information on water level and volume.

[0007] S2. The pipe openings at both ends of the dredging section are sealed with masonry walls: First, a high-pressure water gun and mud pump are hoisted to the bottom of the well where the pipe opening is located. Divers use the high-pressure water gun to flush the silt at the pipe opening and the bottom of the well, and use mud pumps to remove the flushed silt. Then, underwater sealing material is mixed with cement and mortar outside the well and hoisted to the bottom of the well. Bricks are also hoisted to the bottom of the well. Then, a masonry wall is built from the bottom of the pipe opening upwards. A drain pipe with a valve is installed in the middle of the masonry wall. The drain pipe is filled and fixed between the bricks and the wall with quick-setting cement. The quick-setting cement is mixed with cement and alkali in the well by divers. A water passage is left at the top of the masonry wall. The water passage is sealed after the masonry wall has solidified for a certain period of time. Then, a back support is installed on the side of the masonry wall facing inwards to resist the upstream water pressure. The back support is connected to the well wall.

[0008] S3. Pipeline dredging: Before going down into the well, ensure continuous ventilation of the pipeline and well, check the oxygen content and presence of toxic gases, and inspect emergency safety equipment; after going down into the well, maintain ventilation and begin dredging downwards from the wellhead, using a high-pressure water gun to flush away the silt on the well wall and a mud pump to remove the silt; after reaching the bottom of the well, enter the pipeline and dredge along the pipeline, using a high-pressure water gun to flush away the silt on the pipe wall and a mud pump to remove the silt;

[0009] S4. First, ensure that the water level inside the pipe is below a certain level, and then conduct pipe inspection and acceptance.

[0010] S5. Demolition of the masonry wall: Divers chisel away the masonry wall from top to bottom. When there is a large difference in water level on both sides of the masonry wall, first open the valve of the drain pipe on the upstream masonry wall, then make a hole in the downstream masonry wall to reduce pressure. After the water flow slows down, enlarge the hole. After the water level drops significantly and the upstream and downstream water levels are balanced, demolish the entire masonry wall and pack all the bricks and transport them outside the well.

[0011] Preferably, dredging is carried out in sections of three or two well sites, and when dredging is carried out in sections of three well sites, the dredging work is carried out from the middle well site.

[0012] Preferably, in step S1, when the upstream water flow of the dredging section is large, a barrier is installed at the downstream pipe opening to prevent the rapid current from sweeping away the divers.

[0013] Preferably, in step S2, the time from mixing to solidification of the fast-setting cement is less than 1 minute, so as to prevent cement segregation caused by water flow and thus affect the sealing effect.

[0014] Preferably, in step S4, for large-diameter pipelines laid along the river, when it is detected that water in the river will leak into the pipeline or sewage in the pipeline will leak into the river, the soil around the leak point is first grouted and solidified to form a water-proof curtain, and then the pipeline joint is sealed with a sealing material.

[0015] The beneficial effects of this invention are:

[0016] This method ensures drainage throughout the entire process while sealing off the blockage, without affecting normal operation and use. It has high construction efficiency, safe dredging, and can prevent divers from being swept away by water level differences when demolishing the wall, thus ensuring construction safety. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the wall installation in an embodiment of the present invention.

[0018] In the diagram: 1-brick wall; 2-drain pipe; 3-valve; 4-quick-setting cement; 5-back support. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] A method for dredging stormwater and sewage pipes includes the following steps:

[0021] S1. Conduct a survey of the entire stormwater and sewage pipeline upstream and downstream to obtain information on water level and volume.

[0022] S2. The pipe openings at both ends of the dredging section are sealed using masonry wall 1: First, a high-pressure water gun and mud pump are lowered to the bottom of the well where the pipe opening is located. Divers use the high-pressure water gun to flush away the silt at the pipe opening and the bottom of the well, and then use mud pumps to remove the flushed silt. Next, underwater sealing material is mixed with cement and mortar outside the well and lowered to the bottom. Bricks are also lowered to the bottom. Then, masonry wall 1 is built from the bottom of the pipe opening upwards. A drain pipe 2 with a valve 3 is installed in the middle of masonry wall 1 (generally according to the pipe diameter). Two to three drain pipes are set up according to the diameter and water level inside the pipe. The drain pipe 2 is fixed between the bricks and the surrounding area with quick-setting cement 4. The quick-setting cement 4 is mixed with cement and alkali in the well by divers. A water passage (20-30cm high) is left at the top of the masonry wall 1. After the masonry wall 1 has solidified for a certain period of time (12 hours), the water passage is sealed. Then, a back support 5 is set on the side of the masonry wall 1 facing the well to resist the upstream water pressure. The back support 5 is connected to the well wall.

[0023] S3. Pipeline dredging: Before going down into the well, ensure continuous ventilation of the pipeline and well, check the oxygen content and presence of toxic gases, and inspect emergency safety equipment; after going down into the well, maintain ventilation and begin dredging downwards from the wellhead, using a high-pressure water gun to flush away the silt on the well wall and a mud pump to remove the silt; after reaching the bottom of the well, enter the pipeline and dredge along the pipeline, using a high-pressure water gun to flush away the silt on the pipe wall and a mud pump to remove the silt;

[0024] S4. First, ensure that the water accumulation in the pipe is below a certain level (not exceeding 15% of the pipe diameter), and then conduct pipe inspection and acceptance.

[0025] S5. Demolition of wall 1: Divers chisel away wall 1 from top to bottom. When there is a large difference in water level on both sides of wall 1, first open valve 3 of the drain pipe 2 on the upstream wall 1, then make a hole in the downstream wall 1 to reduce pressure. After the water flow slows down, enlarge the hole. After the water level drops significantly and the upstream and downstream water levels are balanced, demolish all of wall 1 and pack all the bricks and transport them outside the well.

[0026] Dredging is carried out in sections of three or two wells. When dredging is carried out in sections of three wells, the dredging work starts from the middle well.

[0027] In step S1, when the upstream water flow is large in the dredging section, a barrier is installed at the downstream pipe opening to prevent the rapid current from sweeping away the divers.

[0028] In step S2, the time from mixing to solidification of the quick-setting cement 4 is less than 1 minute, which prevents cement segregation caused by water flow and thus affects the sealing effect.

[0029] In step S4, for large-diameter pipelines laid along the river, when it is detected that water in the river will seep into the pipeline or sewage in the pipeline will seep into the river, the soil around the seepage point is first grouted and solidified to form a water-proof curtain, and then the pipeline joint is sealed with a sealing material.

[0030] This method ensures drainage throughout the entire process while sealing off the blockage, without affecting normal operation and use. It has high construction efficiency, safe dredging, and can prevent divers from being swept away by water level differences when demolishing the masonry wall, thus ensuring construction safety.

[0031] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A method for dredging stormwater and sewage pipes, characterized in that: Including steps, S1. Conduct a survey of the entire stormwater and sewage pipeline upstream and downstream to obtain information on water level and volume. S2. The pipe openings at both ends of the dredging section are sealed with masonry walls: First, a high-pressure water gun and mud pump are hoisted to the bottom of the well where the pipe opening is located. Divers use the high-pressure water gun to flush the silt at the pipe opening and the bottom of the well, and use mud pumps to remove the flushed silt. Then, underwater sealing material is mixed with cement and mortar outside the well and hoisted to the bottom of the well. Bricks are also hoisted to the bottom of the well. Then, a masonry wall is built from the bottom of the pipe opening upwards. A drain pipe with a valve is installed in the middle of the masonry wall. The drain pipe is filled and fixed between the bricks and the wall with quick-setting cement. The quick-setting cement is mixed with cement and alkali in the well by divers. A water passage is left at the top of the masonry wall. The water passage is sealed after the masonry wall has solidified for a certain period of time. Then, a back support is installed on the side of the masonry wall facing inwards to resist the upstream water pressure. The back support is connected to the well wall. S3. Pipeline dredging: Before going down into the well, ensure continuous ventilation of the pipeline and well, check the oxygen content and presence of toxic gases, and inspect emergency safety equipment; after going down into the well, maintain ventilation and begin dredging downwards from the wellhead, using a high-pressure water gun to flush away the silt on the well wall and a mud pump to remove the silt; after reaching the bottom of the well, enter the pipeline and dredge along the pipeline, using a high-pressure water gun to flush away the silt on the pipe wall and a mud pump to remove the silt; S4. First, ensure that the water level inside the pipe is below a certain level, and then conduct pipe inspection and acceptance. S5. Demolition of the masonry wall: Divers chisel away the masonry wall from top to bottom. When there is a large difference in water level on both sides of the masonry wall, first open the valve of the drain pipe on the upstream masonry wall, then make a hole in the downstream masonry wall to reduce pressure. After the water flow slows down, enlarge the hole. After the water level drops significantly and the upstream and downstream water levels are balanced, demolish the entire masonry wall and pack all the bricks and transport them outside the well. In step S1, when the upstream water flow is large in the dredging section, a barrier is installed at the downstream pipe opening to prevent the rapid current from sweeping away the divers. In step S2, the time from mixing to solidification of the quick-setting cement is less than 1 minute, which prevents cement segregation caused by water flow and thus affects the sealing effect.

2. The method for dredging stormwater and sewage pipes as described in claim 1, characterized in that: Dredging is carried out in sections of three or two wells. When dredging is carried out in sections of three wells, the dredging work starts from the middle well.

3. The method for dredging stormwater and sewage pipes as described in claim 1, characterized in that: In step S4, for large-diameter pipelines laid along the river, when it is detected that water in the river will seep into the pipeline or sewage in the pipeline will seep into the river, the soil around the seepage point is first grouted and solidified to form a water-proof curtain, and then the pipeline joint is sealed with a sealing material.

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