JP2015124572A - Bypass pipe and vacuum liquid collection system using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vacuum liquid collection system capable of maintaining the operation of a vacuum pipe system in a wide range while ensuring smooth flow of the liquid in two directions within a bypass pipe even when a vacuum pipe gets broken.SOLUTION: A bypass pipe 3 is connected to vacuum pipes 1a and 1b in a vacuum liquid collection system V at at least two points of the vacuum pipes 1a and 1b. The vacuum liquid collection system includes a highest point 11 in the half way and has a step-like shape in a longitudinal section, in which up-grades and down-grades are continuously formed alternately.

Description

  The present invention relates to a vacuum type liquid collection system, and more particularly to an improved bypass pipe connected to a vacuum line and a vacuum type liquid collection system including the same.

  Conventionally, there is a liquid collection system that collects liquid discharged from homes and facilities (for example, sewage such as domestic wastewater and factory wastewater). As a liquid collection system, there is a vacuum type liquid collection system including a vacuum pipe line and a vacuum station in addition to a natural flow type liquid collection system using a simple gradient (Patent Document 1).

  FIG. 6A is a diagram illustrating the overall configuration of a vacuum type liquid collection system when collecting sewage. As shown in FIG. 6 (A), the sewage discharged from each household 130 flows into the underground sewage basin 132 through the underground natural sewage pipe 131. When a certain amount of sewage collects in the lower portion of the sewage basin 132, the vacuum valve 133 attached to the upper part of the sewage basin 132 is opened, and the sewage in the sewage basin 132 is sucked into the suction pipe 134.

  The sewage sucked into the suction pipe 134 passes through the vacuum valve 133, enters the vacuum pipe 101 stretched underground, and is collected in the water collection tank 141 of the vacuum station 140. The sewage collected in the water collection tank 141 is sent to a sewage treatment plant or the like by a pressure feed pump 142. A vacuum pump 143 is connected to the water collection tank 141 in order to make the inside of the water collection tank 141 and the inside of the vacuum pipe line 101 have a negative pressure.

  FIG. 6B is a schematic view showing a connection state of the vacuum pipe line 101 used in this vacuum type liquid collection system. As shown in the figure, one or a plurality of main pipes 101-1 are attached to the water collecting tank 141, and a number of branch pipes 101-2 are connected to the main pipe 101-1, and these main pipes 101-1 are further connected. An attachment pipe 101-3, to which a vacuum valve 133 is attached, is connected to the pipe 101-1 and the branch pipe 101-2, and is laid in a tree branch shape as a whole.

  By the way, in the vacuum type liquid collection system, a section valve is installed at a merging part (or a branching part) of the vacuum pipe network in consideration of breakage of the vacuum pipe. Here, the “section valve” is an on-off valve that is arranged in the middle of the vacuum pipe line to allow or block the flow of liquid. For example, in a vacuum line with a section valve opened, a crack or a hole may occur in the middle of the vacuum line, or damage such as a vacuum leak may occur at a connection part of the vacuum line. In such a case, the section valve provided in each part is opened and closed in various combinations to identify the damaged part, and then the section valve located on the downstream side of the damaged part is closed. This makes it possible to temporarily disconnect the damaged portion and the upstream vacuum line network from the liquid collection system and repair the damaged portion while operating the liquid collection system downstream of the section valve.

Japanese Patent Laid-Open No. 3-87432

However, the above-described vacuum liquid collection system has the following problems. FIG. 7 is a schematic diagram showing a state in which the vacuum pipe line 101 is laid in the shape of a tree branch. Among these, in FIG. 7A, the vacuum pipe line 101 is not damaged and is operated normally. In FIG. 7A, the liquid normally flows in all the vacuum pipes 101.

  On the other hand, FIG. 7B shows a state in which damage has occurred at one location upstream of the vacuum pipeline network. If the damaged portion D is an upstream portion that is relatively far from the vacuum station 140 as in the illustrated example, the range R1 of the vacuum line network that is disconnected from the liquid collection system is narrowly limited, which is not a big problem. As shown in FIG. 7C, when the damaged portion D is relatively close to the vacuum station 140, the section valve 107 installed at a position close to the vacuum station 140 is closed, so that most of the vacuum pipe network is Range R2 is disconnected from the liquid collection system. As a result, there is a problem that the range of the vacuum pipe network that can be normally operated when the vacuum pipe 101 is damaged becomes extremely narrow.

  In order to solve the above problem, as shown in FIG. 8A, a method is considered in which a bypass pipe 103 is connected between vacuum pipes 101a and 101b laid in parallel, and a section valve 108 is installed in the bypass pipe. It is done. By using the bypass pipe 103, the range separated from the liquid collection system can be limited. However, as shown in FIG. 8B, the laying heights of the two vacuum pipes 101a and 101b laid in parallel are not necessarily the same. In particular, when the distance 100L between the two vacuum pipes 101a and 101b is large, the laying height is often greatly different. For this reason, if the bypass pipe 103 is simply connected to the vacuum pipes 101a and 101b, the liquid flows smoothly in a downward gradient in the direction P1, but the liquid in the opposite direction P2 becomes an upward gradient. There was a problem that did not flow smoothly.

  FIG. 9A shows the construction of a housing estate facing the main road. When the main pipe 121 of the vacuum pipe is laid on the main road, the branch pipes 122a and 122b of the vacuum pipe in the housing estate. Is an example of laying. In FIG. 9A, three vacuum valves 125 are provided in the a system (part A → B) and the b system (part C → D), respectively. The downstream ends of the branch pipes 122a and 122b are connected to the main pipe 121 of the vacuum pipe. FIG. 9 (B) is a diagram showing the longitudinal shape of the branch pipes 122a and 122b of FIG. 9 (A), and any system has a simple downward slope. FIG. 10 shows a case where damage occurs in the vacuum pipe network shown in FIG. When the branch pipe 122a is damaged in the vicinity of the site B, when the section valve 107 is closed, all the a-system branch pipes 122a are disconnected from the liquid collection system (within the dotted line range).

  The present invention has been made in view of the above problems, and even when the vacuum line in the vacuum type liquid collection system is damaged, the operation of the vacuum line network can be maintained over a wide range, and bidirectional in the bypass pipe. Provided are a bypass pipe that enables a smooth flow of liquid and a vacuum type liquid collection system including the bypass pipe. The problem to be solved by the present invention is not limited to this, and other problems to be solved by the configuration of the present invention are also included.

  In order to solve the above-mentioned problem, the first means is a bypass pipe connected to the vacuum line of the vacuum type liquid collection system, and is connected to at least two places of the vacuum line, and the middle part is the highest level. It has a configuration in which it has a stepped vertical shape in which uphill and downhill are alternately continued. By adopting such a configuration, the bypass pipe functions as follows. That is, the direction of the liquid flow in the bypass pipe is determined in accordance with the breakage point. At this time, the height positions of both ends of the bypass pipe are not necessarily the same. However, since the bypass pipe has a stepped vertical profile, the liquid flows smoothly not only in the direction from the high position to the low position but also in the direction from the low position to the high position.

The second means adopts a configuration in which at least one section valve is provided in the bypass pipe in addition to the first means. In addition to the second means, the third means adopts a configuration in which section valves are provided in the vicinity of both ends of the bypass pipe. By adopting such a configuration, unintentional inflow of liquid from the vacuum pipe to the bypass pipe can be prevented, or when the bypass pipe is damaged, the section valve is closed so that a part of the bypass pipe can be removed from the vacuum pipe. It is possible to detach.

  The fourth means adopts a configuration in which at least one vacuum valve is provided in the bypass pipe in addition to any of the first to third means. By doing so, similarly to the vacuum pipe line, the bypass pipe can suck in liquid such as sewage from the vacuum valve and flow it through the vacuum pipe.

  The fifth means includes a vacuum pipe and a vacuum station connected to the vacuum pipe in addition to the bypass pipe of any of the first to fourth means connected to the vacuum pipe. The system is adopted. By adopting such a configuration, liquid can be collected through the bypass pipe even when damage occurs in any part of the vacuum pipe line. In particular, even when damage occurs on the downstream side in the vicinity of the vacuum station, the liquid can be collected in another vacuum pipe line via the bypass pipe, so that the range of operation stop can be limited to a narrow range.

  The sixth means adopts a configuration in which, in addition to the fifth means, the bypass pipe is connected to two vacuum pipe lines laid in parallel. By adopting such a configuration, it is possible to continue liquid collection using either one of the two vacuum pipes via the bypass pipe even when the vacuum pipe is damaged.

  In addition to the fifth means, the seventh means adopts a configuration in which the bypass pipe is connected to two different places of the vacuum pipe to form a loop-like pipe. By adopting such a configuration, liquid can be collected via the bypass pipe even when damage occurs in any part of the loop-shaped pipe line, so that liquid collection is performed at a part other than the damaged part. Can be continued.

  In addition to any of the fifth to seventh means, the eighth means adopts a configuration in which the vacuum pipe has a stepped longitudinal shape in which an upward gradient and a downward gradient are alternately continued. Yes. By adopting such a configuration, even if it is necessary to flow the liquid from below to above in the vacuum pipe, it is possible to smoothly flow the liquid as in the above-described bypass pipe.

  In addition to any of the fifth to eighth means, the ninth means adopts a configuration in which the inner diameter of the bypass pipe is equal to or smaller than the inner diameter of the vacuum pipe to be connected. In the connection with the bypass pipe, the liquid from the upstream side of the vacuum pipe and the liquid from the bypass pipe join together in the vacuum pipe. By adopting such a configuration, the inner diameter of the bypass pipe is less than the inner diameter of the vacuum pipe. Therefore, the liquid from the upstream side of the vacuum line and the liquid flowing from the bypass pipe can be smoothly flowed together.

  The tenth means adopts a configuration in which, in addition to any of the fifth to ninth means, the bypass pipe is connected to two locations having the same inner diameter in the vacuum line. By adopting such a configuration, even if the flow direction of the liquid in the bypass pipe is reversed according to the damaged part of the vacuum pipe, the pipe diameter of the vacuum pipe and the bypass pipe can be made the same in any direction. It is possible to make the flow of the same conditions.

In addition to any of the fifth to ninth means, the eleventh means adopts a configuration in which a section valve is provided on the downstream side of the connection portion with the bypass pipe in the vacuum pipe line. . By adopting such a configuration, even if the vacuum pipe line is damaged downstream of the connecting part, the section valve is closed and only the downstream side is disconnected from the liquid collecting system, and the remaining part is liquid via the bypass pipe. Collection can continue.

It is the schematic which shows the bypass pipe and vacuum-type liquid collection system provided with the same concerning one embodiment of the present invention, and Drawing 1 (A) shows a normal operation state, and Drawing 1 (B) is a part of vacuum line Indicates that damage has occurred. 2A and 2B are diagrams for explaining the longitudinal shape of the bypass pipe disclosed in FIG. 1, FIG. 2A is a schematic view showing a vacuum type liquid collection system, and FIG. 2B is disclosed in FIG. FIG. 2C is an enlarged view of a part of the bypass pipe. FIG. 3 is a schematic diagram for explaining various operating states of the vacuum type liquid collection system disclosed in FIG. 1, FIG. 3 (A) shows a case of normal operation, and FIG. 3 (B) is an upstream of a vacuum line of system a. 3 (C) shows the case where damage occurs in the downstream part of the vacuum line of the a system, and FIG. 3 (D) shows the case where damage occurs in the downstream part of the vacuum line of the b system. Shows when it occurs. FIG. 4A is a diagram showing a vacuum type liquid collection system in which a loop-like branch pipe is connected to the main pipe of the vacuum pipe line, and a bypass pipe is connected to the branch pipe, and FIG. FIG. 4B shows the longitudinal shape of the branch pipe and the bypass pipe. FIGS. 5A and 5B are schematic views showing an operating state of the vacuum type liquid collection system disclosed in FIG. 4, and FIG. 5A shows a case where damage occurs in the vicinity of the part A, and FIG. This is when damage occurs. FIG. 6 is a view showing a conventional example of a vacuum type liquid collection system, FIG. 6A is a schematic view of the entire liquid collection system, and FIG. 6B is a schematic perspective view showing a configuration in the vicinity of a vacuum station. FIG. 7A is a schematic view showing various operating states in a vacuum type liquid collecting system having a conventional tree-like vacuum pipe network, FIG. 7A shows a normal operation case, and FIG. FIG. 7C shows a case where damage has occurred in the downstream portion near the vacuum station. It is a figure explaining the general laying structure of a bypass pipe, Drawing 8 (A) is a schematic diagram of a vacuum type liquid collection system containing a bypass pipe, and Drawing 8 (B) was indicated in Drawing 8 (A). The vertical profile of the bypass pipe is shown. It is a figure which shows the conventional vacuum-type liquid collection system provided with the branch pipe of a vacuum pipe line, FIG. 9 (A) is a schematic diagram, FIG.9 (B) shows the vertical shape of the vacuum pipe line of each system | strain. FIG. 10 is a schematic view showing a case where damage occurs in the downstream portion of the branch pipe of the a-system vacuum conduit in the vacuum type liquid collection system shown in FIG.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In addition, the said embodiment is an example of this invention to the last, and this invention is not limited to the said embodiment. Further, in the following description according to the present embodiment, various components will be described individually. However, as long as the invention can be realized by each component alone or in any combination, the technical idea of the present invention. Are all included. For this reason, even if it is the individual component respectively described in different embodiment, the invention formed by combining them is included in the scope of the present invention.

[Overview]
Hereinafter, this embodiment will be described with reference to FIGS. 1 to 3. FIG. 1 is a schematic diagram showing a vacuum type liquid collection system V including a vacuum line 1. The invention according to this embodiment is a bypass pipe 3 connected to the vacuum pipes 1a and 1b of the vacuum type liquid collection system V. The bypass pipe 3 is connected to at least two locations of the vacuum pipes 1a and 1b, has a highest point in the middle, and has a stepped vertical profile in which uphill and downhill are alternately continued. .

[Each component]
As shown in FIG. 1 (A), in the vacuum type liquid collection system V according to the present embodiment, a-system vacuum conduit 1a and b-system vacuum conduit 1b are laid in parallel. Each vacuum line 1a, 1b is connected to a vacuum station 5, and a negative pressure created by the vacuum station 5 allows liquid to flow from the upstream side to the downstream side of the vacuum line 1a, 1b. A bypass pipe 3 is connected between the two vacuum pipes 1a and 1b. In the present embodiment, one bypass pipe 3 is shown as an example, but the present invention is not limited to this. That is, by providing a plurality of bypass pipes in one vacuum type liquid collection system, each bypass pipe can be flexibly used according to the position of the damaged portion.

  In each of the vacuum pipes 1a and 1b, section valves 7a1, 7a2, 7b1 and 7b2 are provided in the vicinity of the connection portion with the bypass pipe 3 and in the vicinity of the vacuum station 5, respectively. These section valves 7a1, 7a2, 7b1, and 7b2 allow or block the flow of liquid in the vacuum pipes 1a and 1b by an external operation. The section valves 7a2 and 7b2 are installed on the downstream side (vacuum station side) with respect to the connection portion between the vacuum pipes 1a and 1b and the bypass pipe 3. Further, section valves 8a and 8b are also provided in the vicinity of both end portions of the bypass pipe 3 (in the vicinity of the connection portion with the vacuum pipe lines 1a and 1b). This is to prevent liquid from flowing into the bypass pipe 3 from the vacuum pipes 1a and 1b during normal operation. For this reason, these section valves 8a and 8b of the bypass pipe 3 have the same functions as the section valves 7a1, 7a2, 7b1 and 7b2 installed in the vacuum pipe lines 1a and 1b. Furthermore, a section valve 8 c may be provided in the middle part of the bypass pipe 3. This is for allowing or blocking the flow of the liquid in the bypass pipe 3 according to the damaged part when the bypass pipe 3 itself is damaged.

  FIG. 1B shows a case where a part of the b-system vacuum conduit 1b is damaged. In this example, the vacuum line 1b between the section valves 7b1 and 7b2 is damaged. The term “damage” as used herein is a typical example where a vacuum pipe is cracked or perforated and air is sucked in from the outside. In addition, the vacuum leak at the connecting portion between the vacuum pipes or the vacuum leak due to the failure of the vacuum valve to be closed when the vacuum valve is connected to the section of the section valves 7b1 to 7b2 is also referred to as damage here. include. When such damage occurs, if no measures are taken, a large amount of air is sucked from the damaged part of the b system, and the collection performance for the liquid in the upstream part from the damaged part is deteriorated.

  For this reason, in the present embodiment, the section valve 7b2 near the upstream of the vacuum station 5 and the section valve 7b2 near the downstream of the connection portion between the bypass pipe 3 are closed. Thereby, the section valve 7b1 and the section valve 7b2 are separated from the liquid collection system (dotted line portion in the figure). At the same time, the section valves 8a, 8b, 8c installed in the bypass pipe 3 are opened. As a result, the liquid flowing from the upstream side of the b-system vacuum tube 1 b can flow into the bypass tube 3. Accordingly, not only the a-system vacuum conduit 1a but also the upstream portion of the b-system vacuum conduit 1b is not disconnected from the liquid collection system, and a wide range of the vacuum conduit network can be maintained in the operating state.

  FIG. 2 is a view for explaining a longitudinal shape of the bypass pipe 3 disclosed in FIG. 1. As shown in FIG. 2A, the bypass pipe 3 is connected between two vacuum pipes 1a and 1b laid in parallel. FIG. 2B shows the overall longitudinal shape of the bypass pipe 3. FIG. 2B is an example in which the a-system vacuum conduit 1a is laid at a higher position than the b-system vacuum conduit 1b. As shown in FIG. 2B, the bypass pipe 3 is not laid at a constant gradient but is stairs. Here, the “stepped shape” means a shape in which an ascending gradient and a descending gradient appear alternately. However, even if a part of the horizontal portion is included, it is included in the scope of the technical idea of the present invention.

  More specifically, as shown in FIG. 2 (C), “stepped shape” means 0.1% or more (0.1%) from the connection with the a-system vacuum pipe 1a toward the highest point 11. And a descending head (H1) that extends by a certain distance (L) with a descending slope equal to or greater than the slope. Next, a drop (H2) having a steep ascending gradient (about 45 ° with respect to the horizontal) called lift is provided, which is larger than the drop (H1). As a result, ascending down and ascending descending, the highest point 11 is reached. The same applies to the direction from the connection with the b-system vacuum pipe 1b toward the highest point 11. From the above, the ascending gradient is generally formed from the vacuum line 1a of the a system to the highest point 11, and conversely, the gradient from the highest level 11 to the vacuum line 1b of the b system is generally decreased. In the section from the vacuum line 1a of system a to the highest point 11, the relationship between the heads only needs to be H1 <H2, and the value of each head may be determined in accordance with the topographic conditions. Further, the lengths of the pipes constituting the downward slope and the upward slope are arbitrary, and may be set appropriately according to the horizontal distance from each end of the bypass pipe 3 to the highest point 11 or the like.

  As described above, by configuring the bypass pipe 3 in a step shape, the following advantages can be obtained. That is, as shown in FIG. 2C, the position at which the downward gradient and the upward gradient are switched is the intermediate lowest point 12. For this reason, even if the liquid stays at the intermediate lowest point 12, if the liquid is drawn by the vacuum from the ascending gradient side, the liquid surely rises the ascending gradient and flows down the next descending gradient. it can. This means that the liquid can be reliably pulled up from the vacuum line 1a of the a system to the highest point 11. On the other hand, from the highest point 11 to the vacuum system 1b of the b system, the liquid flows smoothly because it has a downward slope as a whole. The above description is a case where the liquid flows from the vacuum line 1a of the system a toward the vacuum line 1b of the system b.

  Conversely, when a liquid is flowed from the vacuum line 1b of the b system toward the vacuum line 1a of the a system, a downward gradient and an upward gradient are alternately provided from the vacuum line 1b of the b system toward the highest point 11. Therefore, similarly to the above description, the liquid can be reliably pulled up to the highest point 11. Furthermore, the liquid flows smoothly because it has a downward slope as a whole from the highest point 11 to the vacuum line 1a of the a system. Therefore, in this method, even if it flows in both directions in the bypass pipe 3, the liquid can flow smoothly.

  FIG. 2C shows an example of specific numerical values of the longitudinal shape of the bypass pipe 3 from the a-system vacuum pipe 1a to the highest point 11. In this example, the distance in the horizontal direction from the a-system vacuum pipe 1a to the highest point 11 is about 100 m. And it extends about 50 m in the horizontal direction with a 0.1% downward gradient from the connection with the vacuum line 1a. For this reason, the downward drop H1 is 5 cm. On the other hand, the head H2 of the rising slope is 10 cm. For this reason, it will rise 5 cm with a set of downward gradient and upward gradient. In the present embodiment, another set of descending and ascending gradients is provided, and the total rises by 10 cm. The highest point 11 is at a height of 10 cm. The above numerical values are merely examples, and are not intended to limit the present invention to these numerical values. Further, the dimensional ratio between the horizontal direction and the vertical direction in FIG. 2C is for convenience of explanation, and the dimension in the vertical direction is emphasized compared to the horizontal direction.

The bypass pipe 3 at the highest point 11 is laid in the horizontal direction in this embodiment. However, this horizontal laying is not essential for the present invention. That is, the highest point 11 of the bypass pipe 3 may be configured by a pipe having an ascending slope or a descending slope. A vacuum valve 25 may be connected in the middle of the bypass pipe 3. The vacuum valve 25 is a valve that is opened when discharging liquid (sewage or the like) discharged from a home or the like. In that case, it is preferable to install one or more section valves 8 c in the middle part of the bypass pipe 3. By closing the section valve 8c, the bypass pipe 3 can be divided into two and sewage can flow toward each end. However, the section valve 8c is not essential to the present invention.

  The vacuum pipes 1a and 1b and the bypass pipe 3 of the vacuum type liquid collection system V as in the present invention generally have a diameter of 75 mm, 100 mm, 150 mm, 200 mm, 250 mm, or the like. In this regard, in the present embodiment, the pipe diameter of the bypass pipe 3 is the same as the pipe diameter of each of the vacuum pipe lines 1a and 1b. This is because the flow direction of the liquid in the bypass pipe 3 may be reversed depending on the damaged part of the vacuum pipes 1a and 1b. That is, for example, depending on the state of breakage of the vacuum pipe 1a, the liquid flows from the a-system vacuum pipe 1a through the bypass pipe 3 to the b-system vacuum pipe 1b, and conversely, from the b-system vacuum pipe 1b to the bypass pipe 3 In some cases, the liquid flows through the a-system vacuum tube 1a. By making the pipe diameters of the vacuum pipes 1a and 1b and the bypass pipe 3 the same, it is possible to make the flow in any direction the same condition. However, even if the tube diameters of the vacuum pipes 1a and 1b and the bypass pipe 3 are different, it does not function as the vacuum type liquid collection system V. Therefore, the pipe diameters of the bypass pipes 1a and 1b and the vacuum pipe 3 It is not an essential condition for the present invention to have the same tube diameter.

  In addition, when the bypass pipe 3 is connected to the vacuum pipes 1a and 1b of each system, the pipe diameters in the vacuum pipes 1a and 1b are connected at the same two points. This is because, for example, when the pipe diameter of the a-system vacuum pipe 1a and the pipe diameter of the b-system vacuum pipe 1b at the connection portion are different, the flow conditions change depending on the direction in which the liquid flows in the bypass pipe 3. Because. However, even if the pipe diameters of the two vacuum pipes 1a and 1b in the connecting portion are different from each other, it does not mean that the vacuum type liquid collection system V does not function. Connecting the bypass pipe is not an essential condition for the present invention.

  An air suction valve 13 may be provided in the middle of the bypass pipe 3. The air suction valve 13 is a valve unit that sucks only air, and is used for flushing the liquid or the like remaining in the bypass pipe 3. By opening the air suction valve 13, the air sucked in vigorously flushes the inside of the bypass pipe 3, and the liquid staying in the bypass pipe 3 can surely flow to the vacuum pipe line 1 a or 1 b. .

[Function of bypass pipe]
Next, the operation of the bypass pipe 3 and the vacuum liquid collection system V according to the present embodiment will be described based on FIG. FIG. 3A shows a state where the vacuum type liquid collection system V is operating normally and the bypass pipe 3 is not used. This is realized by closing the section valves 8a, 8b, 8c provided in the bypass pipe 3. As shown in FIG. 3A, the a-system vacuum conduit 1a and the b-system vacuum conduit 1b collect liquid independently.

  FIG. 3B shows a case where damage has occurred in the upstream portion of the vacuum line 1a of the a system. In this case, the section valve 7a2 installed in the vicinity of the downstream of the connection part between the a-system vacuum pipe 1a and the bypass pipe 3 and the section valves 8a, 8b, 8c of the bypass pipe 3 remain closed. As a result, only the upstream portion of the a-system vacuum conduit 1a is disconnected from the liquid collection system, and liquid collection is normally performed in other areas.

  FIG. 3C shows a case where damage occurs in the downstream portion of the vacuum line 1a of the a system. In this case, the section valves 7a1, 7a2 are closed and the section valves 8a, 8b, 8c of the bypass pipe 3 are opened. As a result, the liquid flowing from the upstream side of the a system vacuum pipe 1 a flows into the bypass pipe 3, joins the b system vacuum pipe 1 b, and is collected in the vacuum station 5. That is, only the downstream portion of the a-system vacuum pipe 1a is disconnected from the liquid collection system (the dotted line portion in FIG. 3C), and the operation of the other portions is continued.

  FIG. 3D shows a case where damage has occurred in the downstream portion of the b-system vacuum pipe 1b. In this case, the section valves 7b1, 7b2 are closed and the section valves 8a, 8b, 8c of the bypass pipe 3 are opened. As a result, the liquid that has flowed from the upstream of the b-system vacuum pipe 1 b flows into the bypass pipe 3, joins the a-system vacuum pipe 1 a, and is collected in the vacuum station 5. That is, only the downstream portion of the b-system vacuum pipe 1b is disconnected from the liquid collection system (the dotted line portion in FIG. 3D), and the collection operation is continued for the other portions.

  In the state of FIG. 3C and FIG. 3D described above, the directions of the liquid flowing inside the bypass pipe 3 are opposite to each other. That is, in the case of FIG. 3C, the direction is from the a-system vacuum pipe 1a to the b-system vacuum pipe 1b. On the other hand, in the case of FIG. 3D, the direction is from the b-system vacuum pipe 1b to the a-system vacuum pipe 1a. Thus, although the flow direction of the liquid inside the bypass pipe 3 is opposite depending on the damaged part, the longitudinal shape of the bypass pipe 3 is stepped as shown in FIGS. As a result, the liquid flows smoothly in any direction.

[Bypass pipe used for looped vacuum pipes]
FIG. 4 shows a vacuum type liquid collection system V2 including loop-like branch pipes 22a and 22b connected to the main pipe 21 of the vacuum pipe line. This vacuum type liquid collection system V2 is different from the conventional liquid collection system shown in FIG. 9 in that a bypass pipe 23 is provided between the part A and the part C. This embodiment is applied to the case where the main pipe 21 is laid on the main road and the branch pipes 22a and 22b in the housing estate are formed in a loop shape in the creation of a housing estate facing the main road. Can do.

  The branch pipes 22a and 22b and the bypass pipe 23 are connected to a plurality of sets of vacuum valves 25 and take-out pipes 26 corresponding to each dwelling unit, and section valves 27 and 28 are respectively provided between the connecting portions. .

  FIG. 4B is a diagram illustrating the longitudinal shapes of the branch pipes 22 a and 22 b and the bypass pipe 23. In the example shown in FIG. 4B, the highest point is between the part A and the part C. A zone valve 28 is also provided at the highest point, and the zone valve 28 at the highest point is closed during normal operation. This is because the branch pipes 22a and 22b are divided into a-type branch pipes 22a extending from the part A to the part B and b-type branch pipes 22b extending from the part C to the part D, respectively. This is because A downward gradient and an upward gradient appear alternately in both directions from the vicinity of the highest point, and are finally connected to the main pipe 21 of the vacuum line. In FIG. 4B, the section valves 27 of the branch pipes 22a and 22b are omitted for the convenience of illustration.

  FIG. 5 is a schematic view showing a case where the branch pipe 22a disclosed in FIG. In particular, FIG. 5A shows a case where damage has occurred in the vicinity of the upstream of the part A. Even in this case, the area of the damaged part (dotted line part) can be separated from the liquid collection system by closing the section valve 27 in the vicinity of the upstream and downstream sides of the damaged part and opening the highest section valve 28. . At this time, the liquid taken in from the vacuum valve 25 near the upstream of the part A flows from the left to the right at the highest point. Further, the liquid taken in from the vacuum valve 25 in the vicinity of the upstream of the site B flows from the upper side to the lower side in the drawing. For this reason, the vacuum valve 25 which cannot be used is limited to one, and normal operation is maintained for the other parts.

FIG. 5B shows a case where damage has occurred in the vicinity of the upstream side of the portion D of the branch pipe 22b. Even in this case, by closing the zone valve 27 on both sides of the damaged part and opening the zone valve 28 at the highest point, the region only in the vicinity of the portion D (dotted line portion) can be separated from the liquid collection system. Then, the liquid is taken in from the vacuum valve 25 connected to the section from the part B to the vicinity of the part C, the liquid flows from the right to the left at the highest point, and joins the vacuum line 21 in the vicinity of the part B. At that time, since the branch pipes 22a and 22b and / or the bypass pipe 23 are stepped so that a downward gradient and an upward gradient are alternately shown, the liquid smoothly flows in the direction from the portion D side toward the portion C. In this respect, as shown in FIG. 10, there is a great advantage compared to the conventional example in which all parts of the a system cannot be used.

  The present invention can be used for a bypass pipe connected to a vacuum line of a vacuum sewage collection system. The liquid to be collected is not limited to sewage, but applies to all types of vacuum liquid collection systems that use vacuum lines, such as liquid collection systems that contain hazardous substances such as factory wastewater and experimental wastewater. can do.

1, 1a, 1b Vacuum line 3, 23 Bypass line 5 Vacuum station 7a1, 7a2, 7b1, 7b2 Section valve 8a, 8b, 8c, 27, 28 Section valve 11 Highest point 13 Air suction valve 21 Vacuum line (main pipe)
22a, 22b Vacuum pipe (branch pipe)
25 Vacuum valve 101, 101a, 101b Vacuum pipe 101-1 Main pipe 101-2 Branch pipe 101-3 Mounting pipe 103 Bypass pipe 107, 108 Section valve 121 Vacuum pipe (main pipe)
122a, 122b Vacuum pipe (branch pipe)
125 Vacuum valve 130 Each household 131 Sewage pipe 132 Sewage maser 133 Vacuum valve 134 Suction pipe 140 Vacuum station 141 Catchment tank 142 Pumping pump D Damaged part R1, R2 Range V, V2 separated from vacuum type liquid collection system Vacuum type liquid collection system

Claims (11)

A bypass pipe connected to the vacuum line of the vacuum liquid collection system,
A bypass pipe which is connected to at least two places of the vacuum pipe line, has a stepped longitudinal shape in which an intermediate portion is a highest point, and an upward gradient and a downward gradient are alternately continued.   The bypass pipe according to claim 1, wherein at least one section valve is provided.   The bypass pipe according to claim 2, wherein a section valve is provided in the vicinity of both ends.   The bypass pipe according to any one of claims 1 to 3, wherein at least one vacuum valve is provided.   A vacuum type liquid collection system comprising: a vacuum line; a vacuum station connected to the vacuum line; and at least one bypass pipe according to any one of claims 1 to 4 connected to the vacuum line. .   The vacuum type liquid collection system according to claim 5, wherein the bypass pipe is connected to two vacuum pipe lines laid in parallel.   The vacuum type liquid collection system according to claim 5, wherein the bypass pipe is connected to two different places of the vacuum pipe to form a loop-like pipe.   The vacuum type liquid collection system according to any one of claims 5 to 7, wherein the vacuum pipe line has a stepped longitudinal shape in which an upward gradient and a downward gradient are alternately continued.   The vacuum type liquid collection system according to any one of claims 5 to 8, wherein an inner diameter of the bypass pipe is equal to or smaller than an inner diameter of the vacuum pipe to be connected.   The vacuum type liquid collection system according to any one of claims 5 to 9, wherein the bypass pipe is connected to two places having the same inner diameter in the vacuum pipe line.   The vacuum type liquid collection system according to any one of claims 5 to 10, wherein a section valve is provided in the vacuum line on the downstream side of a connection part with the bypass pipe.

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