Pipeline structure and pipeline renewal method

Abstract

To reduce material cost and construction man-hours as compared with a pipeline of a conventional two pipeline ventilation system, and to enable application to a mid-to-high-rise building.SOLUTION: A drainage channel of one system is constituted by a combination of a vertical drainage pipe 2 and a horizontal drainage pipe 3 connected to a main drainage pipe 8, a bent part 4 is provided between the vertical drainage pipe 2 and the horizontal drainage pipe 3, a special drainage joint 5 capable of forming a ventilation space inside while passing drainage is provided in a part where drainage merges in the middle of the vertical drainage pipe 2, and a first ventilation pipe is connected to a lower part of the special drainage joint 5 positioned on a lower side while at least drainage of a building intermediate floor is passed in the drainage channel of each system. A second vent pipe 6b is connected to the lower part of a special drain joint 5 through which drain water on the lowest floor of a building is passed, a third vent pipe 6c is connected to the lower part of a bent part 4, and a pipe having a larger diameter than that before renewal is used as a horizontal drain pipe 3.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a pipeline structure and a pipeline renewal method related to the renewal of deteriorated drainage pipelines installed inside buildings such as apartment buildings. [Background technology]

[0002] For example, in buildings that have been built several decades ago, aging drainage pipes need to be replaced. In recent years, in the case of multi-story buildings (such as condominiums), special drainage joints are typically installed at the drainage junctions on each floor of newly constructed pipes. These special drainage joints, for example, use swirl vanes installed inside to create a swirling flow of the internal drainage along the inner circumferential wall, allowing the drainage to pass through while forming a ventilation space inside the joint. In pipes equipped with such special drainage joints, top ventilation is provided, allowing the drainage standpipe to be used for ventilation as well, eliminating the need for a ventilation standpipe.

[0003] However, in buildings before the commercialization of the special drainage joints, even in cases where drainage pipes were consolidated into a single pipe shaft, a two-pipe ventilation system was used, with a separate sewage standpipe for drainage from toilets and a separate gray water standpipe for other drainage, as well as a ventilation standpipe to ensure ventilation. The "two-pipe" system means that there are two pipes, with a separate ventilation pipe installed in addition to the drainage pipe. Patent Document 1, Figure 4, discloses a "two-pipe drainage pipe" that corresponds to this system.

[0004] When upgrading existing dual-pipe ventilation systems, it is possible to simply replace the existing drainage and ventilation routes with new pipes. However, there is a demand to reduce the amount of pipe material used in the upgrade, thereby reducing material costs and construction labor. There is also a need for a pipeline upgrade method that can be applied to mid- to high-rise buildings (specifically, buildings with eight or more floors). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 5-321308 (Fig. 4) Summary of the Invention [Problem to be solved by the invention]

[0006] Therefore, the present invention aims to provide a pipeline structure and pipeline renewal method that can reduce material costs and construction labor compared to conventional two-pipe ventilation system pipelines and that can be applied to mid- to high-rise buildings. [Means for solving the problem]

[0007] The present invention is a pipeline structure constructed by updating an existing pipeline, comprising a drainage standpipe extending in the vertical direction within a building and a horizontal drainpipe connected to the lower end of the drainage standpipe, the horizontal drainpipe being a larger diameter pipe than before the update, the combination of the drainage standpipe and the horizontal drainpipe forming a single vertical drainage channel, and in one or more systems of drainage channels, the downstream end of the horizontal drainpipe belonging to each system is connected to a main drainpipe, and the pipeline is divided between the drainage standpipe and the horizontal drainpipe. The pipe has a bend where the direction of extension is changed, and at the part where the wastewater meets in the middle of the vertical drainage pipe, a special drainage joint is provided that can pass the wastewater while creating an internal ventilation space, and in the drainage channel of each system, at least a first ventilation pipe is connected below the special drainage joint that is located at the bottom among the joints through which wastewater from the intermediate floors of the building is passed, a second ventilation pipe is connected below the special drainage joint through which wastewater from the lowest floor of the building that is equipped with drainage equipment is passed, and a third ventilation pipe is connected below the bend.

[0008] According to this configuration, by connecting a vent pipe at least below the bend in one drainage channel, the drainage performance of the horizontal drainage pipe can be improved, thereby improving the drainage performance of the entire drainage channel. Therefore, the vent standpipe parallel to the drainage standpipe, which was necessary in the conventional two-pipe ventilation system, is no longer necessary. Furthermore, by using a larger diameter pipe as the horizontal drainage pipe than before the renewal, and by combining the first vent pipe, second vent pipe, and third vent pipe, it is possible to vent the drainage standpipe, which dramatically improves drainage performance.

[0009] The first ventilation pipe and the second ventilation pipe may be independent of each other and not connected to each other.

[0010] According to this configuration, it is possible to avoid providing a vent pipe between the first vent pipe and the second vent pipe, which is not necessary for improving the drainage performance.

[0011] The first ventilation pipe and the second ventilation pipe may be connected to each other and communicate with each other.

[0012] According to this configuration, by allowing ventilation between the first ventilation pipe and the second ventilation pipe, even after renewal, it is possible to increase ventilation by constructing a ventilation standpipe parallel to the drainage standpipe, making it possible to apply this configuration to even higher-rise buildings.

[0013] The second ventilation pipe may be provided above the bent portion, and the second ventilation pipe and the third ventilation pipe may be connected to each other and communicate with each other.

[0014] With this configuration, the positive and negative air pressure conditions that occur in the horizontal drain pipe can be eliminated by air that passes through the second and third ventilation pipes from the ventilation space inside the vertical drain pipe.

[0015] In addition, a fourth ventilation pipe is connected below the special drainage joint through which drainage water from the floor one floor above the lowest floor in the building is passed, and the fourth ventilation pipe is connected to the second ventilation pipe and the third ventilation pipe and is connected to each other.

[0016] According to this configuration, the provision of the fourth ventilation pipe can further improve the drainage performance.

[0017] The present invention also provides a method for updating an existing dual-pipe ventilation system pipeline, wherein the dual-pipe ventilation system pipeline has a sewage standpipe, a gray water standpipe, and a vent standpipe extending in parallel in the vertical direction, a horizontal drain pipe connected to the lower end of the sewage standpipe via a bend where the extending direction of the pipeline is changed, the horizontal drainpipe connected to a main drainpipe, and the horizontal drainpipe is configured to have an elbow just before the connection to the main drainpipe, the lower part of the vent standpipe connected to the sewage standpipe and the gray water standpipe, and the connection to the sewage standpipe is made above the bend, and the portion of the sewage standpipe that needs to be updated is replaced with a new pipe, and at the same time, a special drainage joint that can pass wastewater while forming a vent space inside is newly installed at the part where wastewater joins the sewage standpipe, and the special drainage joint This is a pipeline renewal method in which the connection between the existing sewage system and the gray water system is changed, the horizontal drain pipe is replaced with a new pipe with a larger diameter than before the renewal, the existing section of the vent standpipe that needs to be renewed is replaced with a new pipe, and if it was not connected to the horizontal drainpipe located below the bend, it is newly connected, the gray water standpipe and the section of the vent standpipe that was connected to the gray water standpipe are abolished, and all of the vent standpipe are abolished except for the sections that connect to the first vent pipe connected below the special drainage joint located at the bottom of the ventpipe through which drainage from the intermediate floors of the building is conducted, the second vent pipe connected below the special drainage joint through which drainage from the lowest floor of the building equipped with drainage equipment is conducted, and the third vent pipe connected below the bend.

[0018] According to this configuration, by connecting a vent pipe at least below the bend in one drainage channel, the drainage performance of the horizontal drainage pipe can be improved, thereby improving the drainage performance of the entire drainage channel. Therefore, a vent standpipe parallel to the drainage standpipe, which was necessary in conventional two-pipe ventilation systems, is no longer necessary. Furthermore, by combining the first vent pipe, second vent pipe, third vent pipe, and bypass vent pipe, ventilation can be provided to the drainage standpipe, dramatically improving drainage performance.

[0019] Furthermore, the horizontal drainage pipe can be made of pipe material of the same diameter before and after the renewal.

[0020] This configuration can be used even in cases where it is not possible to increase the diameter of the horizontal drainage pipe due to the structure of the building. [Effects of the Invention]

[0021] The present invention eliminates the need for a vent standpipe, thereby reducing material costs and construction man-hours compared with the conventional two-pipe ventilation system, and furthermore, dramatically improving drainage performance, making it applicable to mid- to high-rise buildings. [Brief explanation of the drawings]

[0022] [Figure 1] FIG. 2 is a diagram illustrating a schematic structure of an upper portion of a pipeline according to an embodiment of the present invention. [Figure 2] FIG. 4 is a diagram schematically illustrating a structure of a lower portion of a pipe according to the embodiment. [Figure 3] FIG. 2 is a diagram showing a schematic structure of a drainage pipeline before renewal. [Figure 4] FIG. 2 is a diagram illustrating the structure of the pipeline according to the present embodiment, showing the abolished portion of the pipeline before renewal. DETAILED DESCRIPTION OF THE INVENTION

[0023] The present invention will be described below with reference to the drawings, taking one embodiment as an example. First, a renewal method for this embodiment, intended for an apartment building, will be described. This renewal method is a method for renewing an existing two-pipe ventilation system drainage pipeline 10, as shown in FIG. 3. For ease of explanation (to identify the type of piping), the pipes located on the ventilation route are shown as dashed lines in FIG. 3, but in reality, the pipes are continuous in the direction in which the pipeline extends (the length direction) (this is the same in other figures).

[0024] An existing dual-pipe ventilation system 10 includes, for example, a sewage standpipe 11, a gray water standpipe 12, and a vent standpipe 13 extending in a vertical direction. Horizontal drainpipes 15, 17 are connected to the lower ends of the sewage standpipe 11 and the gray water standpipe 12 via bends 14, 16, where the direction of the pipes is changed (bent). The sewage standpipe 11 is connected to a sewage system A for drainage from toilets at drainage connection points 11a on each floor, while the gray water standpipe 12 is connected to a gray water system B for drainage from kitchens and other areas on each floor. The bends 14, 16 are typically located below the first floor of a building. Each horizontal drainpipe 15, 17 extends horizontally with a piping slope that makes the downstream end lower. As shown in Figure 2, multiple horizontal drainpipes 15, 17 are connected to a large-diameter main drainpipe 8 at their downstream ends. The pipe sizes are merely examples and are not limited to these, but the sewage standpipe 11 (and the connected horizontal drain pipe 15) is 100A, the wastewater standpipe 12 (and the connected horizontal drain pipe 17) is 80A, and the ventilation standpipe 13 is 65A.

[0025] The lower part of the vent standpipe 13 branches into two and is connected to the sewage standpipe 11 and the gray water standpipe 12, respectively, above bends 14, 16 for the sewage standpipe 11 and the gray water standpipe 12. The upper parts of the sewage standpipe 11, the gray water standpipe 12, and the vent standpipe 13 are connected to form a single pipe, the end of which is open to the atmosphere through a vent port 18.

[0026] In the renewal method of this embodiment, the section of the sewage standpipe 11 that needs renewal is replaced with a new pipe, thereby providing a drainage standpipe 2 as shown in Figures 1, 2, and 4. The drainage standpipe 2 is a single standpipe that combines the sewage standpipe 11 and the miscellaneous drainage standpipe 12 before renewal. A special drainage joint 5 is then installed at the drainage connection point 11a, where drainage water joins the sewage standpipe 11. In an apartment building, the special drainage joint 5 is installed on the floor of each floor. When installing the new special drainage joint 5, the floor slab may be scraped if necessary. The materials of the old and new pipes do not need to be the same; an appropriate material can be selected at the time of renewal (the same applies to other piping besides the sewage standpipe 11). For example, if the old pipe is a metal pipe, the new pipe can be a plastic pipe. Then, the existing sewage system A and miscellaneous drainage system B are reconnected to the special drainage joint 5 (the piping of each system A, B is reconnected).

[0027] The configuration of the special drainage joint 5 is well known, so to briefly explain, it is a joint that can form a ventilation space inside the joint while passing the wastewater, for example by using a swirl vane installed inside to make the wastewater inside swirl along the inner peripheral wall. With this special drainage joint 5, even if a drainage standpipe 2 of the same size as the pre-renewal sewage standpipe 11 is installed and the gray water standpipe 12 is abolished, the wastewater from the sewage system A and the gray water system B can be drained without any problems using a single drainage standpipe 2 equivalent to the pre-renewal sewage standpipe 11.

[0028] The new horizontal drain pipe 3 is then installed by replacing the sections of the horizontal drain pipes 15, 17 that need to be replaced with new pipes. The horizontal drain pipe 3 uses a larger diameter pipe than the previous one. For example, if the previous horizontal drain pipe 15 was 100A, the new horizontal drain pipe 3 is 125A below (downstream of) the bend 4. The reason for this will be explained later. The new ventilation standpipe 6 is then installed by replacing the existing section of the ventilation standpipe 6 that needs to be replaced with a new pipe. An upper connecting ventilation pipe 6a is installed as a first ventilation pipe below the special drainage joint located at the lower end of the intermediate floor, specifically, the special drainage joint that connects the ventilation standpipe 6 to the new drainage standpipe 2, from the top floor (e.g., the 8th floor) to the floor one floor below (the 7th floor in the above case) or two floors below (the 6th floor in the above case). In other words, the upper connecting ventilation pipe 6a is installed on the top two to three floors of the building. This upper connecting vent duct 6a can eliminate negative pressure that occurs in the drainage standpipe 2 due to running water. In Fig. 1, the solid line indicates the case where the upper connecting vent duct 6a is installed corresponding to the top floor (8th floor) and the second floor below (6th floor), and the dashed line indicates the case where the upper connecting vent duct 6a is installed corresponding to the floor below (7th floor). For example, when applied to a high-rise building (e.g., 12 floors or more), it is possible to install multiple upper connecting vent ducts 6a.

[0029] In addition, a lower connecting vent pipe 6b is provided as a second vent pipe below the special drain joint through which drainage from the lowest floor (e.g., the second floor) equipped with drainage facilities (specifically, sewage system A and miscellaneous drainage system B) passes. If the vent standpipe and the horizontal drainpipe 3 located below the bent section 4 are not yet connected, the vent standpipe and the horizontal drainpipe 3 are newly connected via a third vent pipe, a relief vent pipe 6c, and a lower connecting pipe 6d connected to the relief vent pipe 6c. The connection point is located at the upper part of the horizontal drainpipe 3, and the distance L (see FIG. 2) from the start point of the bend at the bent section 4 along the extension direction of the horizontal drainpipe 3 is set within a range of 1.5 to 3 m. In this embodiment, the distance L is set to 1.5 m. Therefore, the vent standpipe 6 is bent appropriately to connect to the connection point. In addition, if the existing pipeline 10 has a vent standpipe 13 connected to the horizontal drain pipe 15, the part that needs to be updated will be replaced with a new pipe. The vent port 18 in the existing two-pipe vent system pipeline 10 will be updated as necessary to become a new vent port 7. A vent cap can be provided on the vent port 7.

[0030] The positive pressure generated in the upper parts of the horizontal drainage pipe 3 and the bent section 4 can be eliminated by the aforementioned lower connecting vent line 6b, relief vent line 6c, lower connecting line 6d, and the second floor connecting line 6e (if provided) described below.

[0031] The gray water standpipe 12 and the portion of the vent standpipe 13 connected to the gray water standpipe 12 are then removed (the portion indicated by "x" in FIG. 4). Note that a portion of the existing vent standpipe 13, indicated by "6g" in FIG. 4, may be removed in some cases, resulting in the configuration shown in FIGS. 1 and 2. In this embodiment, the section of the existing vent standpipe 13 to be removed is the section indicated by "6h" between the upper connecting vent duct 6a and the lower connecting vent duct 6b (or the second-floor connecting duct 6e, if a second-floor connecting duct 6e is installed, as described below) (indicated by "x" in FIG. 4). The gray water standpipe 12, which will no longer be used to carry wastewater, can be removed. However, if no adverse effects are expected, it can be left in the building (in the pipe shaft) as a remaining pipe. This reduces the cost of disposing of waste pipe material.

[0032] On the other hand, as mentioned above, it is also possible to renew the structure by intentionally leaving the section indicated by the symbol "6h" in Figure 4 and creating a vertically connected ventilation standpipe 6f. In this case, ventilation is also possible between the first ventilation standpipe 6a and the second ventilation standpipe 6b through the ventilation standpipe 6. Therefore, even after renewal, by constructing a ventilation standpipe 6 parallel to the drainage standpipe 2, it is possible to increase ventilation by the amount of this ventilation standpipe 6, and the drainage performance of the drainage standpipe 2 can be improved accordingly, making it applicable to even higher-rise buildings.

[0033] Here, the manufacturer of the special drainage joint 5 requires that the horizontal drainage pipe be one size larger than the vertical pipe as a construction condition. The reason for this is that when the water flow direction changes at the bend 4, water splashes up in the pipe downstream of the bend 4, creating an air layer inside the horizontal drainage pipe (upper side), which impairs the flow inside the pipe and prevents it from becoming full. Therefore, when determining the size of the horizontal drainage pipe during design, a "half-pipe calculation" is performed, assuming that water flows through half of the pipe. In accordance with the construction conditions, the renewal method of this embodiment uses a larger diameter pipe material (e.g., 125A) for the horizontal drainage pipe 3 than before renewal (e.g., 100A). Such a larger diameter for the horizontal drainage pipe 3 during renewal is possible, for example, when the main drainage pipe 8 is configured as a ceiling pipe on the first floor. Since the beam penetration (part marked "C") of the horizontal drainage pipe 3 is a steel sleeve, there is a certain amount of radial clearance (e.g., it can penetrate up to approximately 150A).

[0034] Furthermore, the aforementioned renovation method involved replacing the entire ventilation standpipe 13 with the ventilation standpipe 6. However, replacing the entire ventilation standpipe 13, 6 is not a requirement; only the ventilation pipes required to address the air layer generated in the horizontal drainpipe 3 are required. Therefore, the ventilation standpipe 13 can be eliminated except for the upper connecting ventilation pipe 6a, which connects to the drainage standpipe 2 above the bend 4; the relief ventilation pipe 6c, which connects to the horizontal drainpipe 3 below the bend 4; and the lower connecting pipe 6d, which connects the upper connecting ventilation pipe 6a and the relief ventilation pipe 6c. In this case, the unnecessary portion can be removed. Furthermore, if the unnecessary portion of the ventilation standpipe 13 is not expected to have any adverse effects, it can be left in place in the building (within the pipe shaft) as a remaining pipe. Alternatively, the entire ventilation standpipe 13 can be replaced without removing any of the remaining pipes.

[0035] With the above-described renewal method, by connecting a vent pipe at least below the bend 4 in one drainage channel, the drainage performance of the horizontal drainage pipe 3 can be improved, thereby improving the drainage performance of the entire drainage channel. Therefore, the vent standpipe 13 (before renewal) parallel to the drainage standpipe 2, which was necessary in the conventional two-pipe ventilation system pipeline 10, is no longer necessary. Furthermore, since the parts of the vent standpipe 13 that will continue to be used as the vent standpipe 6 even after renewal (mainly the upper connecting vent pipe 6a, the relief vent pipe 6c, and the lower connecting pipe 6d) can be eliminated, material costs and construction man-hours can be reduced compared to the conventional two-pipe ventilation system pipeline 10.

[0036] By performing the above-described renewal method, a pipeline 1 structure such as that shown in FIGS. 1 and 2 can be constructed. This structure includes a drainage standpipe 2 extending vertically within the building and a horizontal drainpipe 3 connected to the lower end of the drainage standpipe 2. A ventilated standpipe 6 is installed so as to extend vertically parallel to the drainage standpipe 2. The piping sizes are merely an example and are not limited to these. The drainage standpipe 2 is 100A (the same size as the sewage standpipe 11 before renewal), the horizontal drainpipe 3 connected to the drainage standpipe 2 is 125A (one size larger than before renewal), and the ventilated standpipe 6 is 65A (the same size as before renewal). In this embodiment, the drainage standpipe 2 and the horizontal drainpipe 3 are installed along the route where the sewage standpipe 11 was located before renewal. Therefore, if the pipe supports have no problems in terms of strength and there is no change in the support method, those used for the sewage standpipe 11 can be reused without replacement.

[0037] A single drainage channel is formed in the vertical direction by combining the vertical drainage pipe 2 and the horizontal drainage pipe 3. Between the vertical drainage pipe 2 and the horizontal drainage pipe 3, a bend 4 is provided, which changes (bends) the direction of the pipe, just as it was before the upgrade. A special drainage joint 5 is provided at the point in the vertical drainage pipe 2 where the wastewater meets.

[0038] In addition, in one drainage channel, a ventilation pipe (ventilation standpipe 6) is connected at least below the bent portion 4. In this embodiment, in one drainage channel, in addition to being connected below the bent portion 4, a ventilation pipe is connected above the bent portion 4 and below the special drainage joint 5 located at the lowest part. With this type of connection, it is difficult to obtain a ventilation effect in the drainage standpipe 2 below the special drainage joint 5 located at the lowest part, so by connecting a ventilation pipe to this part, the drainage performance of the entire drainage channel can be further improved.

[0039] More specifically, the ventilation pipe connected above the bent portion 4 is connected to the ventilation pipe connected below the bent portion 4. This allows the positive and negative air pressure conditions generated in the horizontal drain pipe 3 to be resolved by air from the ventilation space inside the vertical drain pipe 2.

[0040] In this embodiment, the vent pipe connected above the bent portion 4 (the upper connecting vent pipe 6a of the vent standpipe 6) and the vent pipe connected below the bent portion 4 (the relief vent pipe 6c of the vent standpipe 6) are arranged in communication (communication via the lower connecting pipe 6d of the vent standpipe 6), thereby forming the entire vent standpipe 6. As a result, in addition to ventilation via the drainage standpipe 2 using the special drainage joint 5, ventilation can also be achieved in parallel via the vent standpipe 6, allowing sufficient ventilation to ensure drainage performance.

[0041] In this embodiment, the combination of the upper connecting vent pipe 6a as the first vent pipe, the lower connecting vent pipe 6b as the second vent pipe, the relief vent pipe 6c and the lower connecting pipe 6d as the third vent pipe, and the larger-diameter horizontal drain pipe 3 allows ventilation to the drainage stand pipe 2, thereby preventing both negative and positive pressure in each pipe and dramatically improving drainage performance. This makes the system applicable to mid- to high-rise (eight or more stories) apartment buildings, where drainage conditions are more severe than in low-rise buildings. The inventors of this application have confirmed (in a laboratory) that the required drainage performance can be achieved even in 12-story buildings.

[0042] Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications are possible without departing from the spirit of the present invention.

[0043] For example, in the above embodiment, it is assumed that an existing two-pipe ventilation type pipeline 10 is to be updated. However, this is not limited to this, and the structure of the pipeline 1 of the above embodiment can also be newly installed in a newly constructed building. Even in the case of a new construction, there is an advantage in that material costs and construction man-hours can be reduced compared to the conventional two-pipe ventilation type pipeline 10, because there is no need to install the gray water standpipe 12 and there is no need to install all of the ventilation standpipes 6, thereby reducing the cost of constructing the new pipeline 1.

[0044] Furthermore, in the existing pipeline 10 described in relation to the above embodiment, the sewage standpipe 11 and the gray water standpipe 12 are arranged separately in parallel, as shown in Fig. 3. However, this is not limited to this, and the sewage system A and the gray water system B may be joined on each floor of the building and connected to a single standpipe.

[0045] Furthermore, the order of the renewal construction methods is not limited to the order described above, and the order may be reversed as appropriate.

[0046] In the above embodiment, the upper connecting vent pipe 6a as the first vent pipe is provided below the special drain joint located at the bottom of the drainage passages from the top floor (for example, the 8th floor) to the floor one floor below (the 7th floor in the above case) or two floors below (the 6th floor in the above case). However, the first vent pipe (upper connecting vent pipe 6a) may also be provided below the special drain joint of an intermediate floor other than the above.

[0047] Furthermore, the drainage standpipe 2 and the ventilating standpipe 6 can be connected for ventilation purposes at a location other than the upper connecting vent duct 6a (for example, above the upper connecting vent duct 6a or above the special drain joint 5 located at the bottom). The configuration shown in FIG. 4 is one example, showing an example in which, in addition to the first floor (upper connecting vent duct 6a) of the building, a second-floor connecting duct 6e is provided on the second floor of the building as a fourth vent pipe, connecting the drainage standpipe 2 and the ventilating standpipe 6. This further facilitates ventilation, thereby further improving the drainage performance of the entire drainage system. The fourth vent pipe is not limited to being provided on the second floor of the building, as in the second-floor connecting duct 6e described above, but can also be provided on another floor of the building (such as the third floor).

[0048] In addition, in the above embodiment, the upper connecting vent pipe 6a, the relief vent pipe 6c, and the connecting pipe 6d are connected to each other, but for example, only the relief vent pipe 6c may be provided and its end may be open near the horizontal drain pipe 3 to allow ventilation. Alternatively, the upper connecting vent pipe 6a and the relief vent pipe 6c may be provided, with the upper connecting vent pipe 6a having its end open near the vertical drain pipe 2 and the relief vent pipe 6c having its end open near the horizontal drain pipe 3 to allow ventilation.

[0049] In the above embodiment, the sewage standpipe 11 before renewal was replaced with a drainage standpipe 2 (see FIGS. 3 and 4). That is, the renewed drainage standpipe 2 was placed in the position of the sewage standpipe 11 before renewal. However, the positional relationship of the renewed piping relative to the pre-renewal piping is not limited to this, and can be flexibly changed depending on the usage status of the pipe shaft before renewal work was carried out, etc. For example, the position of the renewed drainage standpipe 2 may be the position of the pre-renewal gray water standpipe 12 or vent standpipe 13. Furthermore, the position of the renewed vent standpipe 6 may be the position of the pre-renewal gray water standpipe 11 or gray water standpipe 12. Furthermore, the renewed piping may be placed in a position where no piping existed before renewal. [Explanation of symbols]

[0050] 1 Pipeline (after update) 2 Drainage pipe 3 Traverse drain pipe (after update) 4 Bending section 5 Special drainage joints 6 Ventilation pipe, vertical ventilation pipe (after renewal) 6a First ventilation pipe, upper connecting ventilation pipe 6b Second ventilation pipe, lower connecting ventilation pipe 6c Third ventilation pipe, relief ventilation pipe 6d. Connecting pipes for vertical ventilation pipes 6e No. 4 ventilation pipe, 2nd floor connecting pipe 6f Vertically connected ventilation vertical pipe 7 Ventilation hole (after update) 8 Main drain pipe 10 Pipeline (before update) 11 Sewage vertical pipe 11a Drainage connection point 12 Gray water vertical pipe 13 Ventilation vertical pipe (before renewal) 14 Bending section (for sewage vertical pipes) 15 Horizontal drainage pipe (connected to vertical sewage pipe) 16 Bending section (compatible with grey water vertical pipe) 17 Horizontal drainage pipe (connected to grey water vertical pipe) 18 Ventilation hole (before update) A Sewage system B Gray water system C. Beam penetration part of horizontal drainage pipe L: Distance from the bend to the connection point

Claims

1. A pipeline structure constructed by updating an existing pipeline, A drainage standpipe extending vertically within the building, and a horizontal drainpipe connected to the lower end of the drainage standpipe, The horizontal drainage pipes used are larger in diameter than before the upgrade. The combination of the vertical drainage pipe and the horizontal drainage pipe forms a single drainage channel in the vertical direction, In the drainage channel of one system or multiple systems, the downstream end of the transverse drainage pipe belonging to each system is connected to a main drainage pipe, A bend is provided between the vertical drainage pipe and the horizontal drainage pipe at which the extending direction of the pipe is changed, A special drainage joint is provided at the part of the drainage vertical pipe where the drainage meets, allowing the drainage to pass through while forming an air vent space inside. In the drainage channels of each system, at least A first vent pipe is connected below the special drainage joint located at the bottom among the drainage pipes through which the intermediate floors of the building are passed, A second vent pipe is connected below the special drainage joint through which drainage from the lowest floor of the building equipped with drainage equipment is passed, A pipeline structure in which a third ventilation pipe is connected below the bent portion.

2. 2. The pipeline structure according to claim 1, wherein the first vent pipe and the second vent pipe are not connected to each other and are independent of each other.

3. 2. The pipeline structure according to claim 1, wherein the first ventilation pipe and the second ventilation pipe are connected and communicate with each other.

4. 2. The pipeline structure according to claim 1, wherein the second vent pipe is provided above the bent portion, and the second vent pipe and the third vent pipe are connected to each other and communicate with each other.

5. 5. The pipeline structure of claim 4, wherein a fourth vent pipe is connected below the special drainage joint through which drainage from the floor one floor above the lowest floor in the building is passed, and the fourth vent pipe is connected to the second vent pipe and the third vent pipe and is in communication with each other.

6. 1. A method for upgrading an existing dual-pipe ventilation system, comprising: The two-pipe ventilation system has a sewage standpipe, a miscellaneous drainage standpipe, and a ventilation standpipe extending in parallel in the vertical direction, and a horizontal drainpipe connected to the lower end of the sewage standpipe via a bend where the direction of extension of the pipes is changed, a lower portion of the vent standpipe is connected to the sewage standpipe and the gray water standpipe, and the connection to the sewage standpipe is made above the bent portion; The part of the sewage standpipe that needs to be updated is replaced with a new pipe, and at that time, a special drainage joint is newly installed at the part where the wastewater joins the sewage standpipe, which can pass the wastewater while forming an air space inside, The special drainage joint is used to connect and change the existing sewage system and miscellaneous drainage system, The horizontal drainage pipe is replaced with a new pipe with a larger diameter than before the renewal, The existing parts of the vertical ventilation pipe that need to be updated are replaced with new pipes, and if they were not connected to the horizontal drainage pipe located below the bend, they are newly connected; The wastewater standpipe and the portion of the ventilation standpipe that was connected to the wastewater standpipe were abolished, A pipeline renewal method in which all of the ventilation vertical pipes except for the sections connected to the first ventilation pipe connected below the special drainage joint located at the bottom of the intermediate floors of the building through which drainage water is passed, the second ventilation pipe connected below the special drainage joint through which drainage water is passed from the lowest floor of the building equipped with drainage equipment, and the third ventilation pipe connected below the bend are eliminated.

Images