JP2004360296A - Flood-control branch pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combined sewer system which allows sewage and rainwater to flow therein together without construction of a large-scale concrete building etc., thereby solving the problems of limitation on a construction site for the building and increase in construction costs of the same, wherein the combined sewer system has a flood-control means for preventing an overflow of sewage in a sewer main pipe when the sewage is increased caused by raining etc. without construction of a structure such as a manhole. <P>SOLUTION: There is provided a flood-control branch pipe in order to prevent an overflow of sewage in the sewer main pipe, which is formed of a sewage inflow portion, a branch portion for branching the sewage flowing from the sewage inflow portion to an intercepting sewer and an effluent pipe, an intercepting sewer outflow portion connected to the intercepting sewer, and an effluent pipe outflow portion connected to the effluent pipe. According to the structure of the flood-control branch pipe, the branch portion between the intercepting sewer outflow portion and the effluent pipe outflow portion, has an overflow weir arranged in the vicinity of an inflow port to the effluent pipe outflow portion. The overflow weir is extended from a pipe bottom to partially block a pipe line. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a water distribution branch pipe used for water separation of a combined sewer pipe that mixes and flows sewage and rainwater.
[0002]
[Prior art]
In the combined sewer pipe, sewage and rainwater are mixed and flowed to the same sewer. This sewage is treated at a sewage treatment plant to a water quality that conforms to a discharge regulation value set for each region, and discharged to public waters. Most of the sewage flowing through the combined sewer is sewage that is used for domestic drainage and the like when there is no rainfall, but the amount of water rapidly increases during rainfall because rainwater flows in. However, if the flow rate increases and exceeds the treatment capacity of the sewage treatment plant, the sewage treatment plant will not be able to completely treat the sewage treatment plant, and a part of the increased sewage may be discharged to public water bodies such as rivers. The sewage discharged is a mixture of sewage and rainwater, and the sewage is diluted with rainwater.
[0003]
Conventionally, when a part of sewage is branched from a sewer and discharged, an overflow weir is installed in the sewer and a drainage pipe is installed at the time of water increase so as to guide the sewage beyond that to a river. Is An example of such an overflow weir is shown in FIG. The overflow weir is provided with a diversion manhole (A) as a rainwater discharge chamber in the middle of the sewer pipe, and is installed therein as a reinforced concrete structure. According to this apparatus, an overflow weir (E) is provided in a diversion manhole or rainwater discharge chamber (A) provided with an inflow pipe (B), a discharge pipe (D), and a shielding pipe (C). (D) is provided on the side beyond the overflow weir (E), and the intercepting pipe (C) is provided on the same side as the inflow pipe (B) of the overflow weir (E) (for example, Non-Patent Document) 1).
[0004]
[Non-patent document 1] "Sewerage facility planning / design guideline and commentary, Part 1 ('01 edition)", edited by Japan Sewer Association, 8th storm drainage room (pages 262 to 265)
[0005]
[Problems to be solved by the invention]
[0006]
However, when the diversion manhole of Non-patent Document 1 is installed as a diversion means, since a large-scale structure such as reinforced concrete is constructed, not only the equipment becomes large, but also a large installation place is required. However, there are certain restrictions and the number of construction days is recommended so that it is desirable to select a location that is as close to the discharge area as possible and that, in principle, should be able to discharge water sufficiently even at unplanned water levels. There is a problem that the construction cost is high.
[0007]
The present invention solves the problems of the above-mentioned conventional water diversion means, that is, the problem that the construction site is restricted by constructing a large-scale concrete structure or the like, and the construction cost is increased. In the case of a combined sewer sewer that simultaneously feeds water, if the sewage increases due to rainfall, etc., there is a water diversion means to prevent the sewage increased during rainfall from overflowing to the sewage main without constructing structures such as human holes. It was made for the purpose of providing.
[0008]
[Means for Solving the Problems]
A water diversion pipe according to claim 1 of the present invention for solving the above-mentioned problem (Invention 1) is a water diversion pipe for diverting sewage and flowing out to a shielding pipe and a discharge pipe, The diversion branch pipe is connected to the sewage inflow section, the branch section that diverts the sewage flowing from the sewage inflow section and flows out to the interception pipe and the discharge pipe, respectively, and the interception pipe and the discharge pipe. A pipe having an intercepting pipe outflow section and a discharge pipe outflow section, and a pipe from the pipe bottom near the inlet to the outflow pipe outflow section of the branch section between the intercepting pipe outflow section and the outflow pipe outflow section. An overflow weir is provided so as to partially block the road.
[0009]
In the invention (invention 2) according to claim 2, the pipe diameters of the sewage inflow section and the discharge pipe outflow section are substantially the same, and the height of the overflow weir is at least half the pipe diameter of the interceptor pipe. The diversion branch pipe according to Invention 1, characterized in that the pipe diameter is not more than two thirds of the pipe diameter of the discharge pipe outlet part.
[0010]
The invention according to claim 3 (invention 3) is the water distribution branch pipe according to invention 1 or 2, wherein the overflow weir is made of a fiber-reinforced synthetic resin.
[0011]
The diversion branch pipe in the combined sewerage system includes an inflow pipe and an outflow pipe in at least two directions. In other words, the outflow pipes are normally intercepting pipes for flowing sewage to a sewage treatment plant, and discharge pipes for flowing water increased during rainfall to public water bodies. The intercepting pipe is provided on the same side of the overflow weir as the inflow pipe, and the discharge pipe is provided on the side beyond the overflow weir to allow the overflowed sewage to flow.
[0012]
The branching pipe main body, that is, the inflow pipe, the intercepting pipe or the discharge pipe, is usually a synthetic resin such as vinyl chloride resin, polyethylene, or polypropylene; FRP (fiber reinforced synthetic resin), FRPM (fiber reinforced resin concrete), or the like. Composite resins; made of reinforced concrete or the like. In addition, the overflow weir may be made of the same material, and other metals such as stainless steel, anticorrosive iron, aluminum, and copper may be used.
[0013]
In particular, the use of synthetic resins avoids the problem of low corrosion resistance of the diversion manhole, which was a conventional reinforced concrete structure. In addition, since the shape of the branch pipe and the overflow weir is determined according to the design of each pipe, the FRP that is easily formed into a free shape at the time of molding is particularly suitable. With FRP, a pipeline having excellent corrosion resistance and wear resistance can be formed.
[0014]
The flow rate of the sewage is a pipe diameter that can satisfy the design guess determined by the number of residents in the area that uses the sewer. Therefore, usually, the inlet pipe or the discharge pipe has a large diameter, and the interceptor pipe has a diameter determined by the designed sewage amount. Therefore, the inlet pipe or the discharge pipe has a smaller diameter than the inlet pipe or the discharge pipe.
[0015]
The overflow weir is provided upward from below the bottom of the pipe cross section of the branch outflow portion of the discharge pipe so as to partially block the pipe. The sewage flow is guided to the sewage treatment plant when the sewage does not overflow the overflow weir, that is, in a steady state. You.
[0016]
The height is preferably not less than one-half the pipe diameter of the interceptor pipe and not more than two-thirds of the pipe diameter of the discharge pipe outlet. Normally, the amount of sewage that fills about half of the diameter of the interceptor pipe may flow in. Therefore, if the overflow weir height is less than half of the diameter of the interceptor pipe, a small amount There is a problem that even in the rainfall, the sewage flows over the overflow weir to the discharge pipe side and is discharged to the public waters. Since most of the pipe diameter at the pipe inflow section is blocked by the overflow weir, there is a problem that a large amount of rainwater flows to the interceptor pipe side.
[0017]
In sewage pipes that adopt a general inner diameter, the overflow weir height is often about the same as the inner diameter of the interceptor pipe. That is, the amount of sewage in the steady state is much smaller than that in the rainfall, and the inner diameter of the sewer pipe and its gradient are calculated and designed based on the maximum instantaneous rainfall in some regions. The inside diameter of the collecting pipe is smaller than the inside diameter of the discharge pipe, and therefore the inside diameter of the discharge pipe is designed to be substantially the same as the inside diameter of the inflow pipe.
[0018]
The pipe axis direction of the inflow pipe, the pipe axis direction of the intercepting pipe, and the pipe axis direction of the discharge pipe may be arbitrary directions. However, at the time of construction, for example, it must be constructed so that the pipe axis direction of the inflow pipe is on the same plane as the plane between the intercepting pipe and the pipe axis direction of the discharge pipe, or faces upward from that plane. Needless to say.
[0019]
The pipe bottom height of the interceptor pipe after the diversion branch pipe of the present invention is implemented must not be higher than the pipe bottom height of the inflow pipe. This is because the sewage needs to flow smoothly in a steady state. The same applies to the relationship between the pipe bottom height of the discharge pipe and the pipe bottom height of the inflow pipe.
[0020]
The shape of the overflow section of the overflow weir may be straight or saw-toothed. In the case of the saw type, the overflow water amount is easily and reliably adjusted by adjusting the saw waveform pitch and the saw tooth height.
[0021]
Further, the shape of the plate portion of the overflow weir is not limited to a flat plate shape, and may be a curved surface shape so that the flow of sewage to the interceptor pipe is smooth. Furthermore, when the outer diameter of the interceptor is smaller than the overflow weir height, a through hole is provided in the plate portion where the interceptor is fitted, and the interceptor is inserted and fitted into the through hole and fixed. You may. Further, since the inflow sewage flow collides with the overflow weir and a load is applied thereto, a fixing portion between the pipe and the weir may be reinforced with a rib or the like.
[0022]
An example of a method for obtaining such a water branching pipe will be described below. That is, the water branching pipe main body may be appropriately selected and manufactured depending on the material to be applied, and the manufacturing method is not particularly limited. Normally, the water distribution branch pipe is often made of the same material as the inflow pipe, the intercepting pipe, and the discharge pipe. However, for example, when the pipe is made of FRP, for example, the same method as a general branch pipe manufacturing method is used. It should just be manufactured in.
[0023]
For example, as an example, a through hole is provided in the back wall of a curved tube made of a normal FRPM curved tube, and an intercepting tube is connected and fixed to the through hole by, for example, an FRP hand lay-up method. What is necessary is just to fix the board to the branch part of the discharge pipe and the intercepting pipe by adjusting the height of the weir and fix it by the FRP hand lay-up method. As a material of the FRP, a composite resin of general reinforcing fibers such as glass fiber and carbon fiber and a synthetic resin such as an unsaturated polyester resin, a vinyl ester resin and an epoxy resin is preferably used. When glass fibers are used, those having acid resistance such as ECR glass and C glass are desirable in order to increase corrosion resistance due to sewage.
[0024]
The method of attaching the overflow weir to the diversion branch pipe may be the most appropriate method, taking into account the material of the overflow weir and the material of the diversion branch pipe, and if it is a general method, such a method is used. Method may be used. For example, when the water branch pipe is made of FRPM and the overflow weir is a metal plate made of stainless steel or the like, it may be attached by the FRP hand lay-up method, screwing, or the like. When the water distribution branch pipe is made of a precast product made of (reinforced) concrete, the overflow weir may be made of the same material as the water distribution branch pipe, and may be integrally formed simultaneously with the formation of the water distribution branch pipe. .
[0025]
The connection between the water distribution branch pipe and the sewer pipe, i.e., the inflow pipe and the upstream sewer pipe, the intercepting pipe and the downstream sewer pipe, and the discharge pipe and the discharge sewer pipe are each a seismic joint using a normal rubber ring. It is not necessary that the shape or connection method be limited in particular. Therefore, at the water diversion point, the operation is the same as in the case of connecting and connecting a normal pipe joint.
[0026]
In addition, in the event that inspection or cleaning of the inside of the diversion pipe is required, if a human hole or the like reaching the inside of the diversion pipe from the ground surface is provided, A through hole may be provided in the through hole, and a vertical pipe made of, for example, FRPM may be connected to the through hole to form a human hole, and a ladder or the like may be provided therein as necessary. There is no.
[0027]
(Action)
In the present invention, the combined sewage is separated by a separation branch pipe. The water branch pipe is made of synthetic resin, fiber reinforced synthetic resin, precast reinforced concrete, or the like, and is carried into a sewer construction site, and can be provided by the same operation as that for constructing a normal sewer. . Therefore, there is no need to construct the diversion hole as a concrete building at the sewer construction site. In particular, if synthetic resins and reinforced synthetic resins are excellent in corrosion resistance, no anticorrosion measures are required, and the renewal of the conventional human hole is not required.
[0028]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an example of the water distribution branch pipe of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of one example of the water distribution branch pipe of the present invention. FIG. 2 is a longitudinal sectional view of the water distribution branch pipe of FIG. FIG. 3A is an overflow partial side view of an example of an overflow weir in which an overflow portion has a linear shape, and FIG. 3B is an overflow partial side view of an example of an overflow weir in which an overflow portion has a sawtooth shape. FIG. FIG. 4 is a longitudinal sectional view of another example of the water distribution branch pipe (an example in which the intercepting pipe is connected downward). FIG. 5 is a longitudinal sectional view of an example in which vertical tubes are connected. FIG. 6A is a cross-sectional view of an example in which an interceptor tube is connected to a weir plate, and FIG. 6B is a front view of the weir plate of FIG. 6A.
[0029]
The water distribution branch pipe 1 includes an inflow pipe 2 connected to an upstream sewage pipe in which sewage water and rainwater and the like flow, and an intercepting pipe 3 connected to a downstream sewage pipe toward a sewage treatment plant. A discharge pipe 4 connected to a discharge-side sewage pipe toward a public water area, and an overflow weir 5 separating the intercepting pipe 3 and the discharge pipe.
[0030]
The inflow pipe 2, the interception pipe 3, or the discharge pipe 4 is made of FRPM, and the overflow weir is formed by fixing a flat plate made of FRP to the discharge pipe branch portion by a hand lay-up method.
[0031]
The caliber of the inflow pipe 2 is a water quantity (hereinafter, referred to as a design sewage quantity) that allows for a safety factor of about three times as much as the sewage quantity calculated from the expected future number of local residents and the unit water usage of the sewage pipe. , And the amount of water calculated from the rainfall in the area (hereinafter referred to as the combined sewage). The diameter of the intercepting pipe 3 is set to a diameter capable of connecting a downstream sewer pipe designed based on the designed amount of sewage, and the diameter of the discharge pipe 4 is set to be the same as the diameter of the inflow pipe 2.
[0032]
The connection between the upstream sewer pipe and the inflow pipe 2, the connection between the downstream sewer pipe and the interceptor pipe 3, and the connection between the discharge sewer pipe and the discharge pipe 4 have the same structure as the connection of the sewer pipe. Just do it. For example, the same receiving port or insertion port structure as a general joint with a rubber ring may be used.
[0033]
The mounting position of the overflow weir 5 may be provided anywhere in the inflow pipe 2 as long as the sewage is separated into the intercepting pipe 3 and the discharge pipe 4. For example, as an example, if the inflow pipe 2 is a discharge pipe branch opening of a branch part divided into the intercepting pipe 3 and the discharge pipe 4, at this position, the shape of the weir plate may be flat, The method of fixing the sewage from the pipe 2 to the discharge pipe 4 to the branch pipe while preventing leakage of sewage is relatively easy.
[0034]
The height of the overflow weir 5 is set to a height at which the overflowing weir 5 overflows the weir 5 and flows toward the discharge pipe 4 when the inflow sewage amount exceeds the design water amount. The overflow portion shape of the overflow weir may be a straight shape (see FIG. 3A) or a saw-like shape (see FIG. 3B). The overflow section is provided as a plate-like member separate from the plate of the weir main body, and is provided with an elongated hole or the like. May be attached so that it can be fixed at the position. In this way, when the water distribution branch pipe is constructed, even if the horizontal position of the overflow portion slightly shifts, the correction becomes easy.
[0035]
It is desirable that the tube axis direction of the intercepting tube 3 be on the same line as the tube axis direction of the inflow tube 2 when viewed from above. This makes it easier for the sewage to flow smoothly in normal times. However, in an area where the amount of rainwater is extremely large, the pipe axis direction of the discharge pipe 4 may be on the same line as the pipe axis of the inflow pipe 2 when viewed from above in order to smoothly flow the increasing water quantity. Of course, when viewed from above, it goes without saying that both the pipe axis of the intercepting pipe 3 and the pipe axis of the discharge pipe 4 may be different from the pipe axis of the inflow pipe 2.
[0036]
As shown in FIG. 4, the pipe axis directions of the inflow pipe 2, the interception pipe 3, and the discharge pipe 4 correspond to the plane formed by the respective pipe axes of the inflow pipe 2 and the interception pipe 3, and When arranged substantially horizontally, the discharge pipe 4 may be arranged so that the pipe axis thereof is oriented substantially horizontally or downward.
[0037]
In FIG. 5, when cleaning or inspection of the inside of the water distribution branch pipe 1 is required, a vertical pipe 6 may be provided as shown in FIG. The vertical pipe 6 may be a pipe made of FRP, FRPM, or the like having a diameter that can be inserted by a person, and may be any pipe provided with a step 61 such as a ladder on its inner wall. The vertical pipe 6 has a through hole having the same diameter as the vertical pipe 6 at an appropriate position on the upper pipe wall of the water distribution branch pipe 1, and the vertical pipe 6 is connected and fixed. The connection and fixing method may be a conventional method. For example, as an example, a flange 62 along the outer shape of the water distribution branch pipe 1 is fixed to the vertical pipe 6, and the flange 62 is connected and fixed to the water separation branch pipe 1. Or a method in which the vertical pipe 6 is inserted into the through hole and the vertical pipe 6 and the water distribution branch pipe 1 are connected and fixed by the FRP hand lay-up method (the hand laid-up FRP layer is not shown). No. Usually, these connecting portions are reinforced by winding concrete 63 or the like.
[0038]
FIG. 6 shows another example of a method of attaching the interceptor tube 3 when the outer diameter of the interceptor tube 3 is equal to or less than half the inner diameter of the discharge pipe 4. In this example, a through hole is provided in the main body of the weir plate 5, and the discharge pipe 4 is connected and fixed to the through hole. The discharge pipe 4 protrudes through the pipe wall of the water splitting joint 1, is provided with a connection port, and is connected to the discharge-side sewer pipe. The discharge pipe 4 and the main body of the weir plate 5 or the pipe wall of the water splitting branch pipe 1 are fixed by the FRP hand lay-up method or the like so as not to leak water.
[0039]
【The invention's effect】
As described above, the diversion branch pipe of the present invention can be used in a combined sewer pipe in which sewage and rainwater flow simultaneously, when sewage increases due to rainfall or the like, without constructing a structure such as a human hole. At the same time, it serves as a diversion means to prevent the sewage that has increased during rainfall from overflowing into the sewage mains.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an example of a water distribution branch pipe of the present invention.
FIG. 2 is a longitudinal sectional view of the water distribution branch pipe of FIG. 1;
FIG. 3A is a side view of an example in which an overflow section of an overflow weir has a linear shape.
(B) It is a side view of an example in which the overflow portion of the overflow weir has a sawtooth shape.
FIG. 4 is a longitudinal sectional view of another example of the water distribution branch pipe (an example in which the intercepting pipe is connected downward).
FIG. 5 is a longitudinal sectional view of an example in which vertical tubes are connected.
FIG. 6 (a) is a cross-sectional view of an example in which an interceptor tube is connected to a weir plate.
(B) It is a front view of a dam board. [FIG. 7] It is a top view of an example of the conventional diversion manhole.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Water distribution branch pipe 2 Inflow pipe 3 Interception pipe 4 Discharge pipe 5 Overflow weir 6 Vertical pipe 61 Step 62 Flange 63 Reinforced concrete A Water diversion manhole (rainwater discharge chamber)
B Inflow pipe C Interceptor pipe D Discharge pipe E Overflow weir

Claims (3)

A diversion branch pipe for diverting sewage and flowing out to intercepting pipes and discharge pipes,
The diversion branch pipe, a sewage inflow section, and a branch section that diverts the sewage flowing from the sewage inflow section and flows out to the intercepting pipe and the discharge pipe,
It has an interceptor outlet and an outlet outlet connected to the interceptor and the outlet respectively,
In addition, an overflow weir is provided near the inlet to the outlet of the discharge pipe in the branch portion of the outlet of the intercepting pipe and the outlet of the discharge pipe so as to partially block the pipe from the pipe bottom. A water branching pipe characterized by the following. The pipe diameters of the sewage inflow section and the discharge pipe outflow section are substantially the same,
2. The diversion branch according to claim 1, wherein the height of the overflow weir is not less than one half of the diameter of the interceptor and not more than two thirds of the diameter of the outlet of the discharge pipe. tube. 3. The diversion branch pipe according to claim 1, wherein the overflow weir is made of a fiber-reinforced synthetic resin.

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