Construction method of sewage collection negative pressure pipeline

Abstract

The application relates to a sewage collection negative pressure pipeline construction method, which comprises the following steps: negative pressure pipeline construction, which comprises the following steps: S3.1 excavating a groove and placing a base plate at the bottom of the groove; S3.2 the negative pressure pipeline comprises a plurality of pipe bodies connected through hot melting, a tubular protective film is pre-assembled on the pipe body, the protective film is located at the middle part of the pipe body, and the two ends of the protective film are in a rolled state; after the pipe body is connected through hot melting, the negative pressure pipeline is connected with a collector through a tee joint, then a cushion block is placed on the base plate, the pipe body is placed on the cushion block, then lubricating liquid is applied to the outer circumferential surface of the pipe body, then the protective film is unwound in the direction of the two ends of the pipe body along the length of the pipe body, so that the protective film is attached to the outer circumferential surface of the pipe body, the end parts of the protective films on the two adjacent pipe bodies are overlapped with each other, and the overlapping range of the protective film covers the adjacent pipe body, then a sealing element is fixed at the overlapping part of the protective film to fix the protective film. The application can reduce the leakage influence of the negative pressure pipeline.

Description

Technical Field

[0001] This application relates to the field of pipeline construction, and in particular to a method for constructing a negative pressure pipeline for sewage collection. Background Technology

[0002] Currently, there are two main methods for collecting rural domestic sewage: one is to use gravity flow combined with booster pumps for drainage, and the other is to use a negative pressure pipeline sewage collection system for sewage collection and treatment.

[0003] In related technologies, a negative pressure pipeline sewage collection system includes a water collection branch pipe, a collector, a negative pressure pipe, and a negative pressure station. One end of the water collection branch pipe is connected to the household facilities of residents, while the collector is connected to the water collection branch pipe to directly collect domestic sewage from residents. Each collector is connected to the negative pressure station through the negative pressure pipe. When the sewage in the collector reaches a set height, the vacuum pump on the negative pressure pipe draws a vacuum. The negative pressure acts as a driving force to open the vacuum valve in the collector and uses the negative pressure driving force to transport the sewage in the collector to the negative pressure station to complete the collection. The vacuum pump stops working when the liquid level in the collector drops to the preset minimum liquid level.

[0004] However, negative pressure pipelines are at risk of cracking under prolonged use or external force. Once cracks occur, they can easily cause leaks and affect the vacuum level of the negative pressure pipeline. Summary of the Invention

[0005] To reduce the impact of leakage from negative pressure pipelines, this application provides a construction method for sewage collection negative pressure pipelines.

[0006] This application provides a construction method for a negative pressure sewage collection pipeline, which adopts the following technical solution:

[0007] A method for constructing a negative pressure sewage collection pipeline includes the following steps:

[0008] S1. Construction preparation;

[0009] S2, Construction of water collection branch pipes and collectors;

[0010] S3. Negative pressure pipeline construction, including the following:

[0011] S3.1. Excavate a trench and place a base plate at the bottom of the trench;

[0012] S3.2 The negative pressure pipeline consists of multiple pipes connected by heat fusion. A tubular protective film is pre-fitted onto the pipe body, with the protective film located in the middle of the pipe body and both ends of the protective film in a rolled-up state. After the pipe bodies are heat-fused, the negative pressure pipeline is connected to the collector through a tee joint. Then, a pad is placed on the base plate, and the pipe body is placed on the pad. Lubricant is then applied to the outer circumference of the pipe body. The protective film is then rolled up along the length of the pipe body towards both ends so that the protective film adheres to the outer circumference of the pipe body. The ends of the protective film on two adjacent pipe bodies overlap each other, and the overlap area of ​​the protective film covers the adjacent pipe body. Finally, a sealing element is fixed at the overlap of the protective film to fix the protective film.

[0013] By adopting the above technical solution, and by setting up a protective film and lubricant, the protective film can fit the tube body more closely under tension. When the tube body cracks, the protective film will be quickly sucked in and tightly sealed to block the crack under the negative pressure inside the tube body, thereby maintaining the vacuum inside the tube body.

[0014] Furthermore, by utilizing the overlap of adjacent protective films and the fixing of seals, the airtightness between the protective film and the tube body can be ensured, thereby maintaining the vacuum level inside the tube body.

[0015] Optionally, a scraper ring can be added in step S3.2. The scraper ring is an elastic open-ring structure with a shovel edge on its inner circumferential surface. The scraper ring elastically wraps around the outer circumferential surface of the protective film. The scraper ring moves along the length of the tube to drive the end of the protective film to unwind. At the same time, the shovel edge of the scraper ring continuously abuts against the protective film to force the protective film to adhere to the surface of the tube. The sealing element includes PTFE tape and adhesive tape. After the protective film is unwound, PTFE tape is wrapped around the overlap of the protective film, and then adhesive tape is wrapped around the PTFE tape.

[0016] By adopting the above technical solution, firstly, by using the movement of the scraper ring, the end of the protective film in the winding state can be pushed to achieve unwinding. Furthermore, during this process, the scraper ring's edge continuously abuts against the protective film, forcing the protective film to adhere to the surface of the tube body, thereby improving the adhesion.

[0017] Secondly, by using PTFE tape and adhesive tape, the overlap of the protective film can be quickly sealed and fixed, which is simple and convenient.

[0018] Optionally, the sealing element includes two conical rings and multiple tension springs. The inner diameter of the conical rings is provided with rubber rings, which are elastically fitted onto the protective film. The outer diameters of the two conical rings are separated. In step S3.2, the protective film and the conical rings are pre-fitted onto the tube. After the tube is heat-fused, the conical rings are moved along the length of the tube to unwind the end of the protective film. At the same time, the rubber rings continue to abut against the protective film to force the protective film to adhere to the surface of the tube until the rubber rings of the two conical rings abut against the two stepped grooves of the socket of the tube. Then, tension springs are installed on the two conical rings, and the elastic force of the tension springs forces the two conical rings to move closer to each other.

[0019] By adopting the above technical solution, firstly, the elastic force of the tension spring forces the two conical rings to move closer to each other, thereby causing the rubber rings on them to fit more tightly against the stepped groove of the pipe socket, thus pressing the protective film tightly to improve sealing and fixing stability.

[0020] Secondly, during the movement of the conical ring, the roll can be unwound and the protective film can be forced to adhere to the tube body, which is convenient and quick.

[0021] Optionally, the sealing element further includes force-equalizing rings corresponding to the conical rings. The conical rings include multiple first springs and multiple second springs, which are evenly staggered along the circumference. The ends of the first and second springs are fixedly connected to a third spring, which is arranged radially. The outer circumferential surface of the rubber ring has an annular slot for each of the second springs to be inserted. The force-equalizing rings abut against each of the first springs. In step S3.2, the protective film, rubber ring, conical ring, and force-equalizing rings are pre-fitted onto the tube body in sequence. Then, the rubber ring and conical ring are installed by the cooperation of the second springs and the slots. After the protective film is unwound from the conical ring, the two ends of the tension spring are hooked to the force-equalizing rings on both sides.

[0022] By adopting the above technical solution, the elastic force of the tension spring will be evenly applied to the first spring plate through the force equalizing ring, so as to force the large end edges of the two opposing conical rings to move closer to each other, so that the taper of the conical ring becomes smaller, the outer diameter of the conical ring increases, and the inner diameter of the conical ring decreases. The decrease in the inner diameter of the conical ring means that the second spring plate applies a radial force to the rubber ring. This radial force will force the rubber ring to press more tightly on the protective film, thereby further improving the sealing and fixing strength.

[0023] Optionally, the surface of the rubber ring is divided into multiple planes along the circumferential direction of the cross section, with adjacent planes transitioning through rounded corners.

[0024] By adopting the above technical solution, when the rubber ring is unwound from the protective film, multiple planes can be set to reduce the contact area between the rubber ring and the surface of the protective film, thereby reducing the generation of friction and improving the smoothness of movement.

[0025] Optionally, the diameter of the tube gradually decreases from the center to both ends of the tube, and the intersection points of the normals on the outer circumference of the tube are located inside the tube; the shape of the protective film is adapted to the tube; in step S3.2, the protective film is pre-fitted onto the middle of the tube in a rolled-up state at the ends.

[0026] By adopting the above technical solution, the tube body is shaped like a waist drum. During the process of unwinding the protective film along the axial direction, the protective film is subjected to axial tensile force. Since the tensile force is not consistent with the surface curvature of the tube body, the component of the tensile force will force the protective film to be pulled radially and more tightly adhered to the surface of the tube body, thereby improving the adhesion.

[0027] Optionally, in step S3.2, after the sealing element is fixed, an arc-shaped plate is placed on the upper side of the tube body, the arc-shaped plate covers the protective film, and the side of the arc-shaped plate abuts against the upper surface of the base plate.

[0028] By adopting the above technical solution and setting up an arc-shaped plate, the occurrence of backfill soil directly pressing down on the protective membrane can be reduced, thereby reducing damage to the protective membrane.

[0029] Optionally, there is a movable gap between two adjacent arc-shaped plates. The movable gap is provided with two opposing upper movable covers and two lower movable blocks. The upper movable covers cover the sealing element. The outer surface of the upper movable cover is a first guide slope. Multiple teeth are integrally formed on the opposing surfaces of the two upper movable covers. The teeth of the two upper movable covers are staggered. The surface of the teeth is parallel to the first guide slope of the upper movable cover. An upper abutment ring is fixed to the inner wall of the upper movable cover. The upper abutment ring is a semi-ring and abuts against the upper half of the force equalizing ring. The lower movable blocks are provided with a second guide slope. The second guide slope is parallel to the first guide slope. The lower part of the upper movable cover abuts against the second guide slope. The lower movable block is fixed with a lower abutment ring. The lower abutment ring is a semi-ring and abuts against the lower half of the force equalizing ring.

[0030] By adopting the above technical solution, and by setting up an upper movable cover and a lower movable block, under the action of backfill soil and ground pressure, the downward pressure is applied to the upper movable cover through the first guide slope, thereby forcing the two upper movable covers to move closer together. During the movement of the upper movable cover, the upper abutment ring on it will press against the force equalization ring, thereby improving the contact force between the rubber ring and the protective film.

[0031] Furthermore, the upper movable cover will move downward under the downward pressure. During the downward movement, it will be forced to move closer together by the second guide slope. The lower abutment ring on it will press against the force equalization ring, thereby improving the contact force between the rubber ring and the protective film.

[0032] Optionally, the protective membrane comprises, from the outside to the inside, a geotextile layer, a geomembrane layer, and a gas barrier layer, which are bonded together.

[0033] By adopting the above technical solutions, the geotextile layer can improve the tensile strength and damage resistance of the protective membrane, the geomembrane layer can improve the water-proofing effect, and the gas barrier membrane mainly plays the role of blocking gas.

[0034] Optionally, the negative pressure pipe is a black pipe, and the inner surface of the protective film is provided with a reflective film.

[0035] By adopting the above technical solution, when a negative pressure pipeline ruptures or cracks, a pipeline robot can be used to probe the pipeline during routine inspection. The camera light from the pipeline robot shines through the crack into the reflective film and is reflected into the camera of the pipeline robot, thereby quickly locating the crack for accurate repair.

[0036] In summary, this application includes at least one of the following beneficial technical effects:

[0037] 1. By setting up a protective film and lubricant, the protective film can fit the tube body better under tension. When the tube body cracks, the protective film will be quickly sucked up and tightly sealed to block the crack under the negative pressure inside the tube body, thereby maintaining the vacuum inside the tube body.

[0038] 2. By setting an elastic conical ring, the elastic force of the tension spring will force the conical ring to deform, increasing the outer diameter and decreasing the inner diameter of the conical ring. This converts the elastic force of the tension spring into a radial force applied to the rubber ring by the second spring plate. This radial force will force the rubber ring to press more tightly onto the protective film. The elastic force of the tension spring is also converted into an axial force applied to the rubber ring by the second spring plate. The combination of axial and radial forces further improves the pressing effect of the rubber ring on the protective film of the socket stepped groove, thereby further improving the sealing and fixing strength.

[0039] 3. By setting up an upper movable cover and a lower movable block, the pressure of the backfill soil and the ground surface is used to convert it into the resistance force of the rubber ring against the protective membrane, thereby further improving the sealing and fixing effect. Attached Figure Description

[0040] Figure 1 This is a flowchart of the construction method in Example 1.

[0041] Figure 2This is a schematic diagram of the protective film in the pre-applied state in Example 1.

[0042] Figure 3 This is a schematic diagram of the structure of the protective film in Example 1.

[0043] Figure 4 This is a schematic diagram of the scraper ring in Example 1.

[0044] Figure 5 This is a cross-sectional view of the scraper ring in Example 1.

[0045] Figure 6 This is a schematic diagram of the protective film in Example 1 in a fixed state.

[0046] Figure 7 yes Figure 6 A magnified view of a portion of point A in the middle.

[0047] Figure 8 This is a schematic diagram of the protective film in a fixed state in Example 2.

[0048] Figure 9 This is a schematic diagram of the conical ring of Example 2.

[0049] Figure 10 yes Figure 8 A magnified view of a section at point B.

[0050] Figure 11 yes Figure 8 A magnified view of a section at point C.

[0051] Figure 12 This is a schematic diagram of the arc-shaped plate in Example 3.

[0052] Figure 13 This is a schematic diagram of the protective film in Example 3 in a fixed state.

[0053] Figure 14 This is a side view of the upper protective cover of Embodiment 3.

[0054] Figure 15 This is a top view of the two upper protective covers in Embodiment 3.

[0055] Figure 16 yes Figure 13 A magnified view of a section at point D.

[0056] Figure 17 yes Figure 13 A magnified view of a section at point E in the middle.

[0057] Figure 18 This is a cross-sectional view of the tube body in Example 4.

[0058] Explanation of reference numerals in the attached drawings: 1. Pipe body; 2. Protective membrane; 3. Scraper ring; 5. Sealing element; 6. Arc-shaped plate; 7. Upper movable cover; 8. Lower movable block; 11. Socket; 12. Base plate; 13. Pad block; 21. Geotextile layer; 22. Geomembrane layer; 23. Air barrier layer; 31. Edge scraper; 51. Raw material tape; 52. Adhesive tape; 53. Conical ring; 531. First spring; 532. Second spring; 533. Third spring; 54. Rubber ring; 541. Slot; 542. Plane; 55. Force equalizing ring; 56. Tension spring; 71. First guide slope; 72. Insert tooth; 73. Support leg; 74. Upper abutment ring; 81. Second guide slope; 82. Lower abutment ring. Detailed Implementation

[0059] The following is in conjunction with the appendix Figure 1-18 This application will be described in further detail.

[0060] Embodiment 1 of this application discloses a construction method for a negative pressure pipeline for sewage collection.

[0061] Reference Figure 1 The construction method for negative pressure sewage collection pipelines includes the following steps:

[0062] S1. Construction preparation, including the following:

[0063] S1.1 Investigate the existing underground pipelines in the construction area and preliminarily clear obstacles along the pipeline construction route to provide better construction conditions for subsequent surveying, setting out, and positioning.

[0064] S1.2 Before construction begins, conduct surveys of each village and draw a plan of the sewage pipeline based on the terrain of each village.

[0065] S1.3. Transport the negative pressure pipeline, water collection branch pipe and collector to the site, inspect whether the pipeline is damaged, and check whether the factory quality certificate or test report is complete. The quality certificate must be delivered to the site with the materials and the record and acceptance procedures must be completed.

[0066] S2. Construction of water collection branch pipes and collectors: The water collection branch pipes are made of PE pipes and are laid underground in the villagers' courtyards to handle the drainage from the villagers' kitchens, bathhouses and flush toilets, with an average burial depth of 300mm.

[0067] Collectors are installed at the end of the water collection branch pipes. Specifically, buried collectors are installed at the end of the water collection branch pipes for land residents, and wall-mounted collectors are installed at the end of the water collection branch pipes for the banks of water villages. The collectors are used to collect the sewage discharged by each household, and the outlet of the collector is used to connect to the negative pressure pipe.

[0068] S3. Negative pressure pipeline construction, including the following:

[0069] S3.1 Trench excavation: First, lay out the trench centerline according to the design. Take measurements as you excavate, and leave a safety margin above the design trench bottom elevation for manual excavation. Place a base plate 12 on the cleaned trench bottom. The base plate 12 is made of plastic and is laid out along the length of the trench.

[0070] S3.2, such as Figure 2 , Figure 3 As shown, the negative pressure pipeline includes multiple pipe bodies 1 connected by heat fusion. A tubular protective film 2 is pre-fitted onto each pipe body 1. The protective film 2 is pre-positioned in the middle of the pipe body 1, and both ends of the protective film 2 are in a rolled-up state. The protective film 2 can be a PET film. In this embodiment, the protective film 2 includes, from the outside to the inside, a geotextile layer 21, a geomembrane layer 22, and a gas barrier layer 23. The geotextile layer 21, the geomembrane layer 22, and the gas barrier layer 23 are bonded together, thereby giving the protective film 2 high strength and high water and air barrier properties.

[0071] The pipes 1 are connected by heat fusion, with the negative pressure pipe and the collector connected by a tee joint.

[0072] After the connection is completed, a pad 13 is placed on the base plate 12 beforehand, and then the tube 1 is placed on the pad 13. At this time, the pad 13 supports the protective film 2 in the middle of the tube 1. Then, lubricant is applied to the outer circumferential surface of the tube 1. Then, the protective film 2 is rolled up simultaneously along the length of the tube 1 towards both ends of the tube 1 so that the protective film 2 is attached to the outer circumferential surface of the tube 1. Furthermore, with the help of the lubricant, the protective film 2 adheres more closely to the tube 1 under tension.

[0073] The unwinding operation can be performed by hand to flatten the protective film 2, or by using a scraper ring 3 to assist in unwinding. Specifically, as follows: Figure 4 , Figure 5 As shown, the scraper ring 3 is made of elastic plastic, and the scraper blade has a notch, making the scraper ring 3 an open-ring structure. The inner circumferential surface of the scraper ring 3 is integrally formed with an inclined shovel edge 31. In use, the scraper ring 3 is fitted onto the protective film 2 by elastic deformation. At this time, the scraper ring 3 elastically wraps around the outer circumferential surface of the protective film 2. Pushing the scraper ring 3 causes it to move along the length direction of the tube body 1, thereby pushing the end of the protective film 2 to unwind. During this process, the shovel edge 31 of the scraper ring 3 continuously abuts against the protective film 2, thereby forcing the protective film 2 to adhere to the surface of the tube body 1.

[0074] After unwinding, as follows Figure 6 , Figure 7 As shown, the ends of the protective films 2 on two adjacent pipe bodies 1 will overlap each other, and the overlap range of the protective films 2 will cover the socket 11 of the adjacent pipe body 1.

[0075] Then, a sealing element 5 is fixed at the overlap of the protective film 2 to fix the protective film 2. Specifically, the sealing element 5 includes a PTFE tape 51 and an adhesive tape 52. First, the PTFE tape 51 is wrapped around the overlap of the protective film 2, and then the adhesive tape 52 is wrapped around the PTFE tape 51.

[0076] At the tee joint, the end of the protective film 2 overlaps the tee joint, while the PTFE tape 51 and the adhesive tape 52 are also wrapped around the tee joint.

[0077] In other embodiments, the connected negative pressure pipeline can also be pressure tested, that is, the pressure of the negative pressure pipeline can be tested and the sealing performance can be checked by using a pressure testing device.

[0078] S4. After the negative pressure pipeline construction is completed and passes inspection, the trench should be backfilled in a timely manner. Before backfilling, the construction waste, stagnant water, silt and debris on the base should be cleaned up, and measures should be taken to prevent surface water from flowing into the backfill area.

[0079] The implementation principle of Example 1 is as follows: by setting a protective film 2, when the tube body 1 cracks, the protective film 2 will be quickly sucked up and tightly sealed to block the crack under the action of negative pressure inside the tube body 1, thereby maintaining the vacuum inside the tube body 1.

[0080] The lubricant allows the protective film 2 to fit more closely to the tube body 1 under tension, thereby reducing the gap between the protective film 2 and the tube body 1. Furthermore, the lubricant reduces the frictional force of the protective film 2 relative to the tube body 1. Thus, when the protective film 2 is deformed by negative pressure adsorption, the reduced friction causes the protective film 2 to quickly shift and deform, thereby quickly sealing the crack in the tube body 1.

[0081] Example 2

[0082] The difference between Example 2 and Example 1 is that, as Figure 8 , Figure 9 As shown, the sealing element 5 includes two rubber rings 54, two conical rings 53, two force-equalizing rings 55, and multiple tension springs 56. The conical rings 53 are conical structures and include multiple first spring pieces 531 and multiple second spring pieces 532. The first spring pieces 531 and the second spring pieces 532 are evenly staggered along the circumference. The ends of the first spring pieces 531 and the ends of the second spring pieces 532 are fixedly connected to a third spring piece 533. The third spring piece 533 is arranged radially. The first spring pieces 531 are located at the outer diameter of the conical rings 53, and the second spring pieces 532 are located at the inner diameter of the conical rings 53. The outer diameters of the two conical rings 53 are separated, and the inner diameters of the two conical rings 53 are close to each other.

[0083] like Figure 10As shown, the surface of the rubber ring 54 is divided into multiple planes 542 along the circumferential direction of the cross section, and adjacent planes 542 are connected by rounded corners; the outer circumferential surface of the rubber ring 54 is provided with an annular slot 541, and each of the second spring pieces 532 of the conical ring 53 is inserted into the slot 541.

[0084] In step S3.2, the protective film 2, rubber ring 54, conical ring 53 and force equalizing ring 55 are pre-fitted onto the tube body 1 in sequence. At this time, the rubber ring 54 elastically wraps around the middle of the protective film 2. Then, the installation of the rubber ring 54 and the conical ring 53 is completed by the cooperation of the second spring piece 532 and the slot 541.

[0085] Then, the conical ring 53 is moved axially along the tube body 1 to drive the end of the protective film 2 to unwind. At the same time, the rubber ring 54 continues to abut against the protective film 2 to force the protective film 2 to adhere to the surface of the tube body 1 until the rubber rings 54 of the two conical rings 53 abut against the two stepped grooves of the socket 11 of the tube body 1.

[0086] like Figure 11 As shown, the force equalizing ring 55 is moved so that it abuts against each of the first spring pieces 531. Then, using the hook at the end of the tension spring 56, the hook passes through the gap between two adjacent third spring pieces 533 and hooks the force equalizing ring 55, so that both ends of the tension spring 56 are hooked to the force equalizing rings 55 on both sides, thereby completing the fixing of the seal 5.

[0087] First, under the elastic force of the tension spring 56, it is converted into an axial force that forces the two conical rings 53 to move closer to each other. This axial force will cause the rubber ring 54 to abut more tightly against the stepped groove of the socket 11 of the pipe body 1, thereby pressing the protective film 2 tightly to improve sealing and fixing stability.

[0088] Secondly, the elastic force of the tension spring 56 will force the conical ring 53 to deform, that is, the taper of the conical ring 53 will decrease, the outer diameter of the conical ring 53 will increase, and the inner diameter of the conical ring 53 will decrease. In other words, the elastic force of the tension spring 56 will be converted into a radial force applied to the rubber ring 54 by the second spring plate 532. This radial force will force the rubber ring 54 to press more tightly onto the protective film 2. At the same time, the radial force combined with the axial force mentioned above will further improve the pressing effect of the rubber ring 54 on the protective film 2 of the stepped groove of the socket 11, thereby further improving the sealing and fixing strength.

[0089] Example 3

[0090] The difference between Example 3 and Example 2 is that, as Figure 12As shown, the upper side of the pipe body 1 is covered with an arc-shaped plate 6. The arc-shaped plate 6 is set one-to-one with the pipe body 1. At the same time, the arc-shaped plate 6 covers the protective film 2. The side of the arc-shaped plate 6 abuts against the upper surface of the base plate 12. The arc-shaped plate 6 plays a protective role to reduce the occurrence of backfill soil directly pressing down on the protective film 2, thereby reducing damage to the protective film 2.

[0091] like Figure 13 , Figure 14 , Figure 15 As shown, there is a movable gap between two adjacent arc-shaped plates 6, and the seal 5 is located exactly at the movable gap. The movable gap is provided with two upper movable covers 7 and two lower movable blocks 8 arranged opposite to each other.

[0092] like Figure 14 , Figure 15 , Figure 16 As shown, the upper movable cover 7 is located above the tube body 1. The bottom of the upper movable cover 7 has two vertical support legs 73 integrally formed. The tube body 1 is located between the two support legs 73. The top surface of the upper movable cover 7 is set as the first guide slope 71. The side of the upper movable cover 7 facing the other tube body 1 has multiple insert teeth 72 integrally formed. The insert teeth 72 of the two upper movable covers 7 are staggered. The surface of the insert teeth 72 is parallel to the first guide slope 71 of the upper movable cover 7. The inner wall of the upper movable cover 7 is fixed with an upper abutment ring 74. The upper abutment ring 74 is a half ring with an opening facing downward. The upper abutment ring 74 abuts against the upper half of the force equalizing ring 55.

[0093] like Figure 13 , Figure 17 As shown, the lower movable block 8 is located below the tube body 1. The side of the lower movable block 8 away from the seal 5 is provided with a second guide slope 81. The second guide slope 81 is parallel to the first guide slope 71. The support leg 73 of the upper movable cover 7 abuts downward on the second guide slope 81. The lower movable block 8 is fixed with a lower abutment ring 82. The lower abutment ring 82 is a semi-ring with the opening facing upward. The lower abutment ring 82 abuts against the lower half of the force equalizing ring 55.

[0094] After the sealing element 5 is installed, the upper movable cover 7 and the lower movable block 8 can be added, and then the backfilling construction can be carried out. Under the action of the backfill soil and the ground pressure, the downward pressure is applied to the upper movable cover 7 through the first guide slope 71, thereby forcing the two upper movable covers 7 to move closer together. During the movement of the upper movable cover 7, the upper abutment ring 74 on it will press against the force equalization ring 55, thereby improving the contact force between the rubber ring 54 and the protective film 2.

[0095] At the same time, the upper movable cover 7 moves downward under the action of downward pressure. During the downward movement, it will pass through the second guide slope 81 to force the two lower movable blocks 8 to move close together. The lower abutment ring 82 on it will press against the force equalization ring 55, thereby increasing the contact force between the rubber ring 54 and the protective film 2.

[0096] Example 4

[0097] The difference between Example 4 and Example 1 is that, as Figure 18 As shown, the diameter of the tube 1 gradually decreases from the center of the tube 1 to both ends of the tube 1, and the intersection points of the normals on the outer circumference of the tube 1 are located inside the tube 1, so that the tube 1 is shaped like a waist drum, and the shape of the protective film 2 is adapted to the tube 1, that is, the protective film 2 is also shaped like a waist drum.

[0098] Meanwhile, in order to facilitate the pre-installation of the protective film 2, the end of the protective film 2 can be rolled up in advance. At this time, the diameter of the middle part of the protective film 2 is relatively large, and it can be easily fitted onto the middle part of the tube body 1.

[0099] By defining the shape of the tube body 1, the protective film 2 is subjected to an axial tensile force during the unwinding process along the axial direction. Since the tensile force is not consistent with the surface curvature of the tube body 1, the component of the tensile force will force the protective film 2 to be pulled radially and more tightly adhered to the surface of the tube body 1, thereby improving the adhesion.

[0100] Example 5

[0101] The difference between Example 5 and Example 1 is that the negative pressure pipe is set to a black pipe, and the inner surface of the protective film 2 is provided with a reflective film, which can be an aluminum foil layer, a silver coating layer, or a glass microsphere layer.

[0102] The purpose of this system is that when a negative pressure pipeline ruptures or cracks, if a pipeline robot is used for inspection, the camera light from the pipeline robot shines through the crack into the reflective film and is reflected into the camera of the pipeline robot, thereby quickly locating the crack for accurate repair.

[0103] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A method for constructing a negative pressure sewage collection pipeline, characterized in that: Includes the following steps: S1. Construction preparation; S2, Construction of water collection branch pipes and collectors; S3. Negative pressure pipeline construction, including the following: S3.

1. Excavate a trench and place a base plate (12) at the bottom of the trench; S3.2 The negative pressure pipeline includes multiple heat-fused pipe bodies (1). A tubular protective film (2) is pre-fitted on the pipe body (1). The protective film (2) is located in the middle of the pipe body (1). The two ends of the protective film (2) are in a rolled-up state. After the pipe body (1) is heat-fused, the negative pressure pipeline and the collector are connected through a three-way connector. Then, a pad (13) is placed on the base plate (12). The pipe body (1) is placed on the pad (13). Then, lubricant is applied to the outer circumferential surface of the pipe body (1). Then, the protective film (2) is rolled up along the length of the pipe body (1) towards both ends of the pipe body (1) so that the protective film (2) covers the outer circumferential surface of the pipe body (1). The ends of the protective films (2) on two adjacent pipe bodies (1) overlap each other, and the overlap range of the protective film (2) covers the adjacent pipe body (1). Then, a sealing element (5) is fixed at the overlap of the protective film (2) to fix the protective film (2).

2. The construction method for sewage collection negative pressure pipeline according to claim 1, characterized in that: In step S3.2, a scraper ring (3) is added. The scraper ring (3) is an elastic open-ring structure. The inner circumferential surface of the scraper ring (3) has a shovel edge (31). The scraper ring (3) elastically wraps around the outer circumferential surface of the protective film (2). The scraper ring (3) moves along the length direction of the tube (1) to drive the end of the protective film (2) to unwind. At the same time, the shovel edge (31) of the scraper ring (3) continuously abuts against the protective film (2) to force the protective film (2) to adhere to the surface of the tube (1). The sealing element (5) includes PTFE tape (51) and adhesive tape (52). After the protective film (2) is unwound, PTFE tape (51) is wrapped around the overlap of the protective film (2), and then adhesive tape (52) is wrapped around the PTFE tape (51).

3. The construction method for sewage collection negative pressure pipeline according to claim 1, characterized in that: The sealing element (5) includes two conical rings (53) and multiple tension springs (56). The inner diameter of the conical rings (53) is provided with rubber rings (54), which are elastically fitted onto the protective film (2). The outer diameters of the two conical rings (53) are separated. In step S3.2, the protective film (2) and the conical rings (53) are pre-fitted onto the tube (1). After the tube (1) is heat-fused, the conical rings (53) are folded along the length of the tube (1). The direction is moved to drive the end of the protective film (2) to unwind. At the same time, the rubber ring (54) continues to abut against the protective film (2) to force the protective film (2) to adhere to the surface of the tube body (1) until the rubber ring (54) of the two conical rings (53) abuts against the two stepped grooves of the socket (11) of the tube body (1). Then, tension springs (56) are installed on the two conical rings (53). The elastic force of the tension springs (56) forces the two conical rings (53) to move closer to each other.

4. The construction method for sewage collection negative pressure pipeline according to claim 3, characterized in that: The sealing element (5) further includes force-equalizing rings (55) corresponding one-to-one with the conical ring (53). The conical ring (53) includes a plurality of first spring pieces (531) and a plurality of second spring pieces (532). The first spring pieces (531) and second spring pieces (532) are evenly staggered along the circumference. The ends of the first spring pieces (531) and the ends of the second spring pieces (532) are fixedly connected to a third spring piece (533). The third spring piece (533) is arranged radially. The outer circumferential surface of the rubber ring (54) is provided for each of the second spring pieces (532). The common insertion ring slot (541) and the force equalizing ring (55) abut against each of the first spring pieces (531); in step S3.2, the protective film (2), rubber ring (54), conical ring (53) and force equalizing ring (55) are pre-fitted onto the tube body (1) in sequence, and then the rubber ring (54) and conical ring (53) are installed by the cooperation of the second spring piece (532) and the slot (541); after the conical ring (53) has finished unwinding the protective film (2), the two ends of the tension spring (56) are hooked to the force equalizing rings (55) on both sides respectively.

5. The construction method for sewage collection negative pressure pipeline according to claim 4, characterized in that: The surface of the rubber ring (54) is divided into multiple planes (542) along the circumferential direction of the cross section, and adjacent planes (542) are transitioned by rounded corners.

6. The construction method for sewage collection negative pressure pipeline according to claim 4, characterized in that: The diameter of the tube (1) gradually decreases from the center of the tube (1) to both ends of the tube (1), and the intersection points of the normals of the outer circumferential surface of the tube (1) are located inside the tube (1); the shape of the protective film (2) is adapted to the tube (1); in step S3.2, the protective film (2) is pre-fitted onto the middle part of the tube (1) in a rolled-up state at the end.

7. The construction method for sewage collection negative pressure pipeline according to claim 4, characterized in that: In step S3.2, after the sealing element (5) is fixed, an arc-shaped plate (6) is placed on the upper side of the tube body (1), the arc-shaped plate (6) covers the protective film (2), and the side of the arc-shaped plate (6) abuts against the upper surface of the base plate (12).

8. The construction method for sewage collection negative pressure pipeline according to claim 7, characterized in that: There is a movable gap between two adjacent arc-shaped plates (6). The movable gap is provided with two opposing upper movable covers (7) and two lower movable blocks (8). The upper movable covers (7) cover the sealing member (5). The outer surface of the upper movable cover (7) is a first guide slope (71). Multiple insert teeth (72) are integrally formed on the opposing surfaces of the two upper movable covers (7). The insert teeth (72) of the two upper movable covers (7) are staggered. The surface of the insert teeth (72) is parallel to the first guide slope (71) of the upper movable cover (7). The inner wall of the upper movable cover (7) An upper abutment ring (74) is fixed, and the upper abutment ring (74) is a semi-ring. The upper abutment ring (74) abuts against the upper half of the force equalizing ring (55). The lower movable block (8) is provided with a second guide slope (81), and the second guide slope (81) is parallel to the first guide slope (71). The lower part of the upper movable cover (7) abuts against the second guide slope (81). The lower movable block (8) is fixed with a lower abutment ring (82), and the lower abutment ring (82) is a semi-ring. The lower abutment ring (82) abuts against the lower half of the force equalizing ring (55).

9. The construction method for a negative pressure sewage collection pipeline according to claim 1, characterized in that: The protective membrane (2) consists of a geotextile layer (21), a geomembrane layer (22), and a gas barrier layer (23) from the outside to the inside. The geotextile layer (21), the geomembrane layer (22), and the gas barrier layer (23) are bonded together.

10. The construction method for a negative pressure sewage collection pipeline according to claim 1, characterized in that: The negative pressure pipe is a black pipe, and the inner surface of the protective film (2) is provided with a reflective film.

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