JP7784296B2 - Vertical pipe with spiral guideway - Google Patents

Description

This invention relates to a vertical pipe with a spiral guideway, through which liquid flows spirally down the vertical pipe body.

As is well known, the main lines of river-basin sewer systems are planned to be located relatively deep underground, and the connection points with related public sewer systems are high-head junctions. As a result, the vertical pipes installed inside manholes are long, and the impact of sewage flowing down to the bottom of the vertical pipes is large, posing the risk of damaging the bottom.

As a result, a technology is becoming increasingly popular that uses a vertical pipe with a spiral guideway (a drop shaft with a vertically elevating central tube) to connect the upstream horizontal pipe located above with the downstream horizontal pipe located below (see, for example, Patent Document 1).

A vertical pipe with a spiral guideway (a central tube lifting drop shaft) generally has a spiral guideway formed around a central tube disposed within the vertical pipe body, with the spiral guideway continuing to the bottom.
When installing a vertical pipe with a spiral guideway inside the vertical pipe body, the spiral guide member must be fixed to the inner surface of the vertical pipe body using FRP lamination in a narrow space inside the vertical pipe body, which requires technically very specialized and difficult work.

In addition, when there is a high head difference between the upstream and downstream horizontal pipes, the central cylinder of a vertical pipe with a spiral guideway becomes longer, and the number of spiral turns forming the spiral guideway also increases, which can be economically disadvantageous in some cases.

Meanwhile, in order to eliminate the economic disadvantage of reducing the number of spirals in the spiral guideway in a central tube lift-type drop shaft (vertical tube with spiral guideway), a hollow-out type has been proposed in which the upper and lower spirals are separated and the spiral guideway in that section is omitted (see, for example, Patent Document 2).

JP 2017-179920 A JP 2011-089338 A

The sewerage design guidelines published by the Japan Sewage Works Association require that the vertical spacing of "landings (intermediate slabs, central cylinders)" be within 5m. For this reason, central cylinders are generally designed to be spaced 3-5m apart.
Furthermore, in order to prevent the vortex generated inside the vertical pipe from disappearing, the vertical spacing of the spiral guideway must be within 10 times (10D) the nominal diameter of the vertical pipe.

However, in vertical pipes installed in sewers, the 10D can be 5m or more. Therefore, installing central cylinders with spiral guideways at intervals of 3-5m in accordance with the above-mentioned design guidelines is more than necessary to prevent the vortex flow inside the vertical pipe from disappearing. This has created challenges in reducing construction costs.

The present invention was made in consideration of the above-mentioned circumstances, and aims to provide a vertical pipe with a spiral guideway that is equipped with a sufficient number of guideways, does not eliminate internal vortex flows, and is inexpensive.

In order to solve the above problems, the present invention proposes the following means.
The vertical pipe with a spiral guide path of the present invention comprises a vertical pipe main body made of a straight pipe and arranged in a vertical direction, a plurality of central cylinders arranged in a vertical direction inside the vertical pipe main body, an upper central cylinder having the central cylinder located at the top of the plurality of central cylinders and an upper spiral guide path formed in a spiral around the central cylinder, and a lower central cylinder having the central cylinder located at the bottom of the plurality of central cylinders and a lower spiral guide path arranged below the upper central cylinder, and is characterized in that the plurality of central cylinders have at least one central cylinder guide path formed between the upper central cylinder and the lower central cylinder, and ladders are installed between the upper central cylinder and the central cylinder guide path and between the central cylinder guide path and the lower central cylinder.

According to this invention, the multiple central cylinders include at least one central cylinder guideway formed between an upper central cylinder and a lower central cylinder. In other words, a central cylinder without a spiral guideway is provided between the upper and lower central cylinders. This allows the spacing between the upper and lower central cylinders to be set to a necessary and sufficient distance of 10D or less, while the spacing between the central cylinders can be set to 3 to 5 m. This makes it possible to create a vertical pipe with a spiral guideway that is sufficiently provided with spiral guideways and that does not eliminate internal vortex flows. Furthermore, not having a spiral guideway allows for a more inexpensive product. Furthermore, the weight of the product can be reduced, shortening the construction period. As a result, a vertical pipe with a spiral guideway can be created with lower costs.

In addition, ladders are installed between the upper center cylinder and the center cylinder guideway, and between the center cylinder guideway and the lower center cylinder. This allows movement between the upper center cylinder and the center cylinder guideway, and between the center cylinder guideway and the lower center cylinder, using the ladders. This ensures excellent maintainability.

The upper part of the lower central cylinder may be provided with a water inflow prevention roof and an air exhaust port.

According to this invention, a water inflow prevention roof and an air outlet are provided on the upper part of the lower central cylinder. The provision of the water inflow prevention roof prevents water from entering the interior of the lower central cylinder. Here, the wastewater that flows down the lower spiral guide path may contain air. If this air flows downstream from the vertical pipe with the spiral guide path, drainage efficiency decreases. By providing an air outlet on the upper part of the lower central cylinder, air contained in the wastewater that flows down through the lower central cylinder is removed from the interior of the drainage via the lower central cylinder. This prevents air from flowing downstream from the vertical pipe with the spiral guide path, improving drainage efficiency.

Furthermore, the lower end of the lower central cylinder may be located above the downstream horizontal pipe connected to the lower side of the vertical pipe body.

According to this invention, the lower end of the lower center cylinder is located above the downstream horizontal duct located on the lower side of the vertical pipe body. This prevents water from entering through the downstream horizontal duct from the lower end of the lower center cylinder.

The present invention makes it possible to provide a vertical pipe with a spiral guideway that is equipped with a sufficient number of guideways, does not cause the internal vortex flow to disappear, and is inexpensive.

5 is a schematic diagram illustrating the schematic configuration of the vertical pipe with a spiral guideway according to the first embodiment of the present invention, as viewed from the side indicated by arrows II in FIG. 4. [0023]FIG. 5 is a schematic configuration diagram of the vertical pipe with a spiral guideway according to the first embodiment, viewed from the side indicated by arrows II-II in FIG. 4. [0023]FIG. 5 is a side view taken along the line II-II in FIG. 4, illustrating a main part of the vertical pipe with a spiral guideway according to the first embodiment. FIG. 4 is a conceptual plan view taken along arrows IV-IV in FIG. 1 , illustrating the schematic configuration of the vertical pipe with a spiral guideway according to the first embodiment. FIG. FIG. 10 is an enlarged view of the lower upper end slab according to the first embodiment. FIG. 6 is a plan view of the lower top slab shown in FIG. 5 . This is a modified example in which a vertical tube with a spiral guideway has an intermediate central cylinder.

A first embodiment of the present invention will be described below with reference to FIGS.
FIG. 1 is a schematic diagram of a vertical pipe with a spiral guideway according to a first embodiment of the present invention, viewed from the side as indicated by arrows I-I in FIG. 4 . FIG. 2 is a schematic diagram of a vertical pipe with a spiral guideway according to a first embodiment of the present invention, viewed from the side as indicated by arrows II-II in FIG. 4 . FIG. 3 is a side view of a vertical pipe with a spiral guideway according to a first embodiment of the present invention, viewed from the side as indicated by arrows II-II in FIG. 4 . FIG. 4 is a conceptual plan view of a vertical pipe with a spiral guideway according to a first embodiment of the present invention, viewed from the side as indicated by arrows IV-IV in FIG. 1 . FIG. 5 is an enlarged view of a lower upper end slab according to the first embodiment. FIG. 6 is a plan view of the lower upper end slab shown in FIG. 5 . FIG. 7 shows a modified vertical pipe with a spiral guideway having an intermediate central cylinder. Note that in FIGS. 1 to 7 , dashed lines and cross sections may be used only where necessary.

In Figures 1 to 7, reference numeral 10 denotes a vertical pipe with a spiral guideway, 100 denotes the vertical pipe body, 110 denotes the central cylinder, 120 denotes the spiral guideway, 121 denotes the upper spiral guideway, 125 denotes the lower spiral guideway, 130 denotes the hollow space, 140 denotes a flat guide member, 150 denotes the central cylinder fixing support member, 160 denotes the central cylinder guideway, O denotes the pipe axis of the vertical pipe body, and P denotes the pitch. Reference numerals R1 and R2 conceptually indicate the direction of movement of sewage (liquid) in the upper and lower spiral guideways. Dimensional relationships are exaggerated in some places.

As shown in Figures 1 to 4, the vertical pipe 10 with a spiral guide path includes, for example, a vertical pipe main body 100, a central cylinder 110, a spiral guide path 120, a hollow space 130, a flat guide member 140, a central cylinder fixing support member 150, and a central cylinder guide path 160.
In this embodiment, the vertical pipe body 100 and the central cylinder body 110 have the same pipe axis O.

The vertical pipe 10 with a spiral guideway is arranged vertically within a concrete underground structure (e.g., a manhole) 11 formed vertically in the ground G, and connects an upstream horizontal pipeline 12 and a downstream horizontal pipeline 13 vertically within the manhole 11.
In this embodiment, the upstream horizontal pipe 12 and the downstream horizontal pipe 13 are formed in directions perpendicular to each other when viewed from above.

The manhole 11 is made of concrete or the like, and has a cylindrical wall portion arranged so that its axis runs vertically, an upper wall portion (not shown) formed on the upper side of the cylindrical wall portion, and a concrete bottom surface formed on the lower surface.
An opening (not shown) is formed in the upper wall, and a manhole entrance (not shown) that leads to the ground is connected to it.
Furthermore, for example, the manhole 11 may have an inner diameter of several meters and may be an assembly type formed by stacking multiple pipes, or may be formed from cast-in-place concrete.

As shown in Figures 1 to 4, the vertical pipe body 100 is formed from a cylindrical straight pipe with a vertical pipe cavity 101 formed inside, and is arranged in the vertical direction along the pipe axis O inside the manhole 11.
The material for forming the vertical pipe body 100 can be set arbitrarily, but in this embodiment, it is formed from, for example, FRP (Fiber Reinforced Plastics).

An upper opening 102 is formed on the upper side surface of the vertical pipe body 100, and the upstream horizontal pipe 12 is connected to this upper opening 102.
A lower opening 103 is formed on the lower side surface of the vertical pipe body 100, and the downstream horizontal pipe 13 is connected to this lower opening 103. In other words, the downstream horizontal pipe 13 is disposed on the lower side surface of the vertical pipe body 100.

A plurality of central cylinders 110 are arranged in the vertical direction inside the vertical pipe main body 100. Specifically, as shown in Figures 1 to 4, the central cylinders 110 are formed of cylindrical straight pipes with central cylinder hollow portions 111 formed inside, and are arranged in the vertical direction along the pipe axis O inside the manhole 11.
In this embodiment, the uppermost of the multiple central cylinders 110 is referred to as the upper central cylinder 110a. The lowermost of the multiple central cylinders 110 is referred to as the lower central cylinder 110b. The central cylinder between the upper central cylinder 110a and the lower central cylinder 110b is referred to as the intermediate central cylinder 110c. Hereinafter, when there is no need to distinguish between the upper central cylinder 110a, the lower central cylinder 110b, and the intermediate central cylinder 110c, they will all be referred to as the central cylinder 110.
The material for forming the central cylinder 110 can be set arbitrarily, but in this embodiment, it is formed from, for example, FRP (Fiber Reinforced Plastics).

A plurality of inspection ladders 115 are arranged at intervals along the vertical direction inside the central cylinder 110. A retractable hook ladder 116 is also arranged below the inspection ladders 115.
Furthermore, steps 114 are formed between the inspection ladders 115 and near the upper end of the retractable hook ladder 116 .

The spiral guide path 120 guides the flow direction of the wastewater that flows down the vertical pipe body 100. Specifically, by making the wastewater flow down the inside of the vertical pipe body 100 in a spiral shape, the wastewater forms a vortex. This serves to increase the efficiency of drainage. In order for the wastewater to form a vortex, it is preferable that the spiral guide path 120 form at least three spirals from the top to the bottom.

As shown in FIGS. 1 to 4, the spiral guide path 120 is connected to the outer peripheral surface 110A of the central cylinder 110, and is formed in a counterclockwise spiral shape around the tube axis O when viewed in plan.
The spiral guide path 120 can be made of any material, but in this embodiment, it is made of, for example, FRP (Fiber Reinforced Plastics).
The spiral guide path 120 is connected to the inner peripheral surface 100B of the vertical pipe body 100 by, for example, applying FRP lamination thereto.

As shown in Figures 1 to 4, the spiral guide path 120 includes an upper spiral guide path 121 arranged in the upper central cylinder 110a and a lower spiral guide path 125 arranged in the lower central cylinder 110b.
The upper spiral guide path 121 is formed in a spiral shape around the upper central cylinder 110a. In this embodiment, the upper spiral guide path 121 has at least three spiral turns from the top to the bottom. Hereinafter, the configuration including the upper central cylinder 110a and the upper spiral guide path 121 will be referred to as the upper central cylinder 121a.
The lower spiral guide path 125 is formed in a spiral shape around the lower central cylinder 110b. In this embodiment, the lower spiral guide path 125 has at least three spiral turns from the upper end to the lower end. Hereinafter, the configuration including the lower central cylinder 110b and the lower spiral guide path 125 will be referred to as the lower central cylinder 125a.

As shown in FIG. 3 , in the upper center cylinder 121a, the lower end of the upper spiral guideway 121 and the lower end of the upper center cylinder 110a are located at the same position in the direction of the tube axis O. Alternatively, the lower end of the upper center cylinder 110a may be located lower than the lower end of the upper spiral guideway 121. An upper end slab 121S is installed inside the upper center cylinder 110a near the lower end. An extension ladder 117 is installed on the upper end slab 121S. The extension ladder 117 can be extended or retracted within a range of 3 to 5 meters. When the extension ladder 117 is extended, it is located between the upper center cylinder 121a and the lower center cylinder 125a. In other words, the extension ladder 117 extends downward from the upper end slab 121S.

A lower upper end slab 125S is provided above the lower central cylinder 110b. A safety fence 125f to prevent falls is also installed around the periphery of the lower upper end slab 125S, as shown in Figure 5. As shown in Figure 5, the lower upper end slab 125S is provided with a water inflow prevention roof 125r and an air exhaust port 125d.

The water inflow prevention roof 125r prevents water from entering the lower center cylinder 110b from above in the direction of the pipe axis O. The lower center cylinder 110b and the water inflow prevention roof 125r are connected by beams B. Specifically, the connection is made as follows: First, the underside of the water inflow prevention roof 125r is connected to the first flange frame F1 shown in FIG. 5 by welding or the like. Next, the first flange frame F1 is connected to the second flange frame F2 provided at the upper end of the lower center cylinder 110b by flange bolts FB. The second flange frame F2 is preferably provided on the lower center cylinder 110b in advance before construction. The second flange frame F2 may be attached to the lower center cylinder 110b by welding, or may be integrally formed during the manufacture of the lower center cylinder 110b.

As shown in Figures 5 and 6, a lid 125c is provided on the water inflow prevention roof 125r. The lid 125c is fixed to the water inflow prevention roof 125r with fixing bolts 125b. The lid 125c is opened when an operator enters the interior of the lower central cylinder 125a. This keeps the upper end of the lower central cylinder 110b closed while the vertical pipe 10 with spiral guideway is in use, and opens it to allow entry during inspection. FRP is preferably used for the lid 125c.

5, the air outlet 125d is provided between the lower center cylinder 110b and the water inflow prevention roof 125r. The air outlet 125d is a gap between the lower center cylinder 110b and the water inflow prevention roof 125r that opens in a direction perpendicular to the tube axis O.
When wastewater flows down inside the vertical pipe 10 with the spiral guide path, air may be entrained in the wastewater (entrained air). If this entrained air flows down into the downstream horizontal pipe 13, it will cause a decrease in the efficiency of the wastewater. The air discharge port 125d serves to discharge the entrained air contained in the wastewater through the lower central cylinder 110b.

3, water may splash from the bottom of the spiral guideway-equipped vertical pipe 10 when draining water. This may cause the drainage water to enter the interior of the lower central cylinder 125a from below. To prevent this, the lower end of the lower central cylinder 125a is positioned above the upper end of the downstream horizontal pipe 13.
It is preferable that the lower end of the lower central cylinder 125a be at a height that allows an operator to stand upright at the bottom of the vertical pipe 10 with a spiral guide path and facilitates maintenance. From this perspective, it is preferable that the lower end of the lower central cylinder 125a be located approximately 2 m above the bottom of the vertical pipe 10 with a spiral guide path in the direction of the pipe axis O. The lower end of the lower spiral guide path 125 and the lower end of the lower central cylinder 110b are located at the same position in the direction of the pipe axis O.
The upper end of the lower spiral guide path 125 and the upper end of the lower central cylinder 110b are provided at the same position in the direction of the tube axis O. Alternatively, without being limited to this, the upper end of the lower central cylinder 110b may be located above the upper end of the lower spiral guide path 125.

Between the upper central cylinder 121a and the lower central cylinder 125a in the direction of the tube axis O, the spiral guide path 120 and the central cylinder 110 are not arranged, and a hollow space 130 is formed into which liquids such as sewage can fall freely due to gravity. In this embodiment, at least one hollow space 130 is formed. When moving through the hollow space 130 in the direction of the tube axis O, i.e., when moving between the upper central cylinder 110a and the lower central cylinder 110b, an extendable ladder 117 is used for movement. For this reason, the dimension of the hollow space 130 in the direction of the tube axis O is preferably 3 to 5 m.

As shown in FIG. 3 , the upper spiral guide path 121 has, for example, an upper end 122 disposed below the bottom surface of the upstream horizontal pipe 12 .
The upper spiral guide passage 121 receives liquid such as sewage that flows into the vertical pipe body 100 from the upstream horizontal pipe 12, and causes it to flow down along the upper spiral guide passage 121 in a spiral shape (in the direction of arrow R1) around the central cylinder 110, and then discharges it from the lower end 123 into the hollow space 130.

The lower spiral guideway 125 has a lower end 127 positioned above the downstream horizontal pipe 13 .
The lower spiral guide path 125 is configured to receive liquid such as sewage that has flowed down the hollow space 130, and cause it to flow down in a spiral around the central cylinder 110 along the lower spiral guide path 125, and then discharge it from the lower end 127.

Centrifugal force causes liquids such as sewage to flow along the inner surface 100B of the vertical pipe body 100. Air is collected on the inner periphery (towards the pipe axis O) and moves upward through the vertical pipe cavity 101. As the sewage flows downward in a spiral (in the direction of arrow R2) along the upper spiral guide path 121, its flow energy is attenuated, preventing it from strongly colliding with the bottom surface 100C of the vertical pipe body 100. The sewage (liquid) that has flowed down to the bottom surface 100C is then discharged through the downstream horizontal pipe 13.

As described above, the spiral guide path 120 increases the efficiency of drainage by causing the drainage water to form a vortex. In this case, if the distance between the lower end of the upper spiral guide path 121 and the upper end of the lower spiral guide path 125 is 10 times (10D) or less the inner diameter D of the vertical pipe body 100, the vortex formed by the upper spiral guide path 121 does not disappear and moves to the lower spiral guide path 125. Therefore, in the direction of the pipe axis O of the vertical pipe body 100, the area without the spiral guide path 120 can be up to 10D.

When the above-mentioned 10D exceeds 5 m, that is, when the dimension in the direction of the tube axis O from the lower end of the upper center cylinder 110a to the upper end of the lower center cylinder 110b exceeds 5 m, an intermediate center cylinder 110c is provided between the upper center cylinder 110a and the lower center cylinder 110b, as shown in Figure 7. In this case, the dimension in the direction of the tube axis O between the lower end of the upper center cylinder 110a and the upper end of the intermediate center cylinder 110c, and between the lower end of the intermediate center cylinder 110c and the upper end of the lower center cylinder 110b, is preferably 3 m to 5 m.

A lower upper end slab 125S is provided at the upper end of the intermediate central cylinder 110c, similar to the lower central cylinder 110b. An inspection ladder 115 and a retractable hook ladder 116 are arranged inside the intermediate central cylinder 110c, similar to the upper central cylinder 110a and lower central cylinder 110b. Furthermore, an upper terminal slab 121S is installed at the lower end of the intermediate central cylinder 110c, similar to the upper central cylinder 110a. An extension ladder 117 is installed on the upper terminal slab 121S.

Multiple intermediate central cylinders 110c may be provided at intervals of 3 to 5 m in the direction of the tube axis O. In this case, if the dimension in the direction of the tube axis O from the lower end of the upper spiral guide path 121 to the upper end of the lower spiral guide path 125 exceeds 10D, the vortex formed by the upper spiral guide path 121 will disappear. In this case, to prevent the vortex from disappearing, a middle spiral guide path (not shown) is provided between the upper spiral guide path 121 and the lower spiral guide path 125.

The middle spiral guideway is provided on the outer periphery of the intermediate center cylinder 110c. The middle spiral guideway has a configuration similar to the upper spiral guideway 121 and the lower spiral guideway 125. In this embodiment, the middle spiral guideway has at least three spiral turns from the upper end to the lower end. Hereinafter, the configuration including the intermediate center cylinder 110c and the middle spiral guideway will be referred to as the middle center cylinder. Furthermore, the intermediate center cylinder 110c that does not have a middle spiral guideway will be referred to as the center cylinder guideway 160.

The central center cylinder may be provided at one location in the direction of the tube axis O, or multiple locations may be provided. When multiple central center cylinders are provided, it is preferable that the central center cylinders and the central cylinder guide paths 160 are provided alternately. However, this does not apply when the distance between the central center cylinders in the vertical direction is 10D or less. Specifically, multiple central center cylinder guide paths 160 may be arranged between the central center cylinders.
At least one central cylinder guide path 160 is formed between the upper central cylinder 121 a and the lower central cylinder 125 a as one of the plurality of central cylinders 110. The central cylinder guide path 160 may be provided at one location in the tube axis O direction, or multiple locations may be provided.

The flat guide member 140 is, for example, a rectangular flat plate member. The flat guide member 140 is arranged along the tube axis O. The flat guide member 140 can be made of any material, but in this embodiment, it is made of stainless steel, for example. The flat guide member 140 is provided on the outer peripheral surface of the central cylinder 110 in a portion where the spiral guide path 120 is not provided. Specifically, the flat guide member 140 is arranged in the following manner.

For example, when the lower end of the upper central cylinder 110a is located lower than the lower end of the upper spiral guide path 121, the flat guide member 140 is provided in a portion of the upper central cylinder 110a where the upper spiral guide path 121 is not provided.
Alternatively, when the upper end of the lower central cylinder 110b is located above the upper end of the lower spiral guide path 125, the flat guide member 140 is provided in a portion of the lower central cylinder 110b where the lower spiral guide path 125 is not provided.
Alternatively, the flat guide member 140 is provided on the outer peripheral surface of the central tube guide path 160 .
In this embodiment, the flat guide member 140 is provided in a portion of the lower central cylinder 110b where the lower spiral guide path 125 is not provided.

The flat guide member 140 is formed, for example, so that its width corresponds to the radial distance between the vertical pipe body 100 and the central cylinder body 110 (half the difference in inner diameter).
When viewed in a plane, the flat guide member 140 has an outer peripheral edge 140A connected to the inner peripheral surface 100B of the vertical pipe main body 100, and an inner peripheral edge 140B connected to the outer peripheral surface 110A of the central cylinder 110.
As a result, the flat guide member 140 has the function of fixing and supporting the central cylinder 110 and the vertical pipe main body 100 .

In addition, in this embodiment, as shown in Figure 3, the distance L from the upper end 141 of the flat guide member 140 to the lower end of the upper spiral guide path 121 is set to, for example, 1.0D, where D is the inner diameter of the vertical pipe body 100.

The position of the upper end 141 of the flat guide member 140 in the direction of the tube axis O is determined by the distance L
It may be set arbitrarily within the range of ≧0.8D.
Setting the distance L from the lower end 123 of the upper spiral guide path 121 in the direction of the pipe axis O of the upper end 141 of the flat guide member 140 within the range of distance L ≧ 0.8D is preferable because the distance L is lower than one revolution of the spiral guide path 120, allowing the circumferential velocity of the liquid flowing downward to be sufficiently reduced. In addition, distance L ≧ 0.8D means that the distance L is lower by 1P (pitch) or more in the upper spiral guide path 121.
With this configuration, the sewage flowing out of the upper spiral guide path 121 makes one circuit around the central cylinder 110 before colliding with the flat guide member 140 .

Furthermore, when viewed from above, the flat guide member 140 is positioned at the same circumferential position as the lower end 123 of the upper spiral guide path 121. In other words, the flat guide member 140 is positioned directly below the lower end 123 of the upper spiral guide path 121.

The lower end 142 of the flat guide member 140 is positioned to correspond to the upper end 126 of the lower spiral guide path 125 in the direction of the pipe axis O.

In other words, the flat guide member 140 is formed in the range from a position spaced a distance L from the lower end 123 of the upper spiral guide path 121 to the upper end 126 of the lower spiral guide path 125 in the direction of the tube axis O.

Specifically, the lower end 142 of the flat guide member 140 is formed about a quarter turn forward (downstream) relative to the upper end 126 of the lower spiral guide path 125 in the circular direction in which the sewage (liquid) flows from upstream to downstream, in other words, about 90° forward around the pipe axis O.
The circumferential position of the lower end 142 of the flat guide member 140 is not limited to being a quarter turn forward of the upper end 126 of the lower spiral guide path 125, and may be set arbitrarily.

The central cylinder fixing support member 150 supports the upper central cylinder 121 a, the lower central cylinder 125 a, and the intermediate central cylinder 110 c inside the vertical pipe main body 100 .
The material for forming the central cylinder fixing support member 150 can be set arbitrarily, but in this embodiment, the central cylinder fixing support member 150 is formed from, for example, stainless steel. Forming the central cylinder fixing support member 150 from stainless steel is preferable because it prevents corrosion of the central cylinder fixing support member 150 even when it comes into contact with sewage or the like inside the vertical pipe 10 with the spiral guideway.
The central cylinder fixing and supporting member 150 may be made of a material other than stainless steel, or may be made of a plurality of materials.

Next, the operation of the vertical pipe 10 with the spiral guideway will be described.
(1) First, a liquid such as sewage flows into the vertical pipe 10 with a spiral guideway. Specifically, the liquid flows from the upstream horizontal pipe 12 into the vertical pipe body 100.
(2) The liquid that flows into the vertical pipe body 100 falls down inside the vertical pipe body 100 and flows into the upper spiral guide path 121.
(3) The liquid that has flowed into the upper spiral guide path 121 is guided by the upper spiral guide path 121, and flows downward in a spiral shape in the direction of arrow R1 while circling around the central cylinder 110.
Then, the liquid flows through the upper spiral guide path 121 at an increased circumferential flow rate, and the centrifugal force increases.
At this time, the liquid flows along the inner peripheral surface 100B of the vertical pipe body 100 due to centrifugal force.
The air is then collected on the inner circumferential side (the tube axis O side) and moves upward through the vertical tube cavity 101.

(4) The liquid is then discharged from the lower end 123 of the upper spiral guideway 121 into the hollow space 130 .
The liquid discharged from the upper spiral guide path 121 breaks up within the hollow space 130 as its falling speed is accelerated by gravity and its circumferential speed is slowed by the upper spiral guide path 121. The broken up liquid makes one revolution around the central cylinder 110 and then collides with the flat guide member 140. This prevents the broken up liquid from becoming mist or granular.
The spiral flow is guided downward by a distance L (1.0D) from the lower end 123 of the upper spiral guide path 121, so that the flow velocity in the circumferential direction is sufficiently reduced. Here, the pitch 1P of the upper spiral guide path 121 in the vertical direction is approximately 0.8D.
The pitch refers to the vertical (height) dimension when the upper spiral guide path 121 goes around a virtual cylinder extending in the vertical direction, and the height of one revolution of the upper spiral guide path 121 is 1P (pitch).

(5) The liquid that collides with the flat guide member 140 is rectified downward (substantially vertically, in the direction of arrow V) along the flat guide member 140. In other words, the dispersed liquid is collected by the flat guide member 140.
The liquid rectified by the flat guide member 140 flows into the lower spiral guide path 125 at the lower end 142 of the flat guide member 140 .
(6) The liquid that has flowed into the lower spiral guide path 125 flows downward in a spiral shape while circling the periphery of the central cylinder 110 along the lower spiral guide path 125. The behavior of the liquid at this time is the same as that in the upper spiral guide path 121.
The liquid that flows spirally down along the lower spiral guide path 125 in the direction of arrow R2 has a small vertical flow velocity, and is therefore prevented from strongly colliding with the bottom surface 100C of the vertical pipe main body 100. Furthermore, noise, vibration, and splashes caused by the liquid colliding are suppressed.
The sewage (liquid) that has flowed down to the bottom portion 100C is then discharged through the downstream horizontal pipe 13.

As described above, the spiral guideway-equipped vertical pipe 10 according to this embodiment has multiple central cylinders 110, each of which has at least one central cylinder guideway 160 formed between the upper central cylinder 121a and the lower central cylinder 125a. In other words, a central cylinder 110 without a spiral guideway 120 is provided between the upper central cylinder 121a and the lower central cylinder 125a. This allows the spacing between the central cylinders 110 to be set at 3 to 5 m, while maintaining a necessary and sufficient distance of 10D or less between the upper central cylinder 121a and the lower central cylinder 125a. This allows for a spiral guideway-equipped vertical pipe 10 that is provided with a sufficient number of spiral guideways 120 and that does not lose its internal vortex flow. Furthermore, the absence of a spiral guideway 120 allows for a more inexpensive product. Furthermore, the weight of the product is reduced, shortening the construction period. These factors contribute to a more cost-effective spiral guideway-equipped vertical pipe 10.

In addition, ladders are installed between the upper central cylinder 121a and the central cylinder guide path 160, and between the central cylinder guide path 160 and the lower central cylinder 125a. This allows movement between the upper central cylinder 121a and the central cylinder guide path 160, and between the central cylinder guide path 160 and the lower central cylinder 125a using the ladders. This ensures excellent maintainability.

In addition, a water inflow prevention roof 125r and an air outlet 125d are provided on the upper part of the lower central cylinder 125a. The provision of the water inflow prevention roof 125r prevents water from entering the interior of the lower central cylinder 125a. The wastewater flowing down the lower spiral guide path 125 may contain air. If this air flows downstream of the vertical pipe 10 with a spiral guide path, drainage efficiency will decrease. The provision of the air outlet 125d on the upper part of the lower central cylinder 125a allows air contained in the wastewater flowing down through the lower central cylinder 125a to be removed from the interior of the wastewater via the lower central cylinder 125a. This prevents air from flowing downstream of the vertical pipe 10 with a spiral guide path, improving drainage efficiency.

In addition, the lower end of the lower central cylinder 125a is located above the downstream horizontal duct 13, which is arranged on the lower side of the vertical pipe body 100. This prevents water from entering through the downstream horizontal duct 13 from the lower end of the lower central cylinder 125a.

The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, although the central cylinders 110 are described as being arranged in pairs, this is not limiting, and for example, three or more central cylinders 110 may be provided.

Furthermore, the lower end 142 of the lower spiral guide path and the lower end 142 of the lower central cylinder 110b do not have to be located at the same position in the tube axis O direction.
Furthermore, in the above embodiment, the liquid flowing into the vertical pipe 10 with a spiral guide path is described as sewage or the like, but the liquid flowing into the vertical pipe 10 with a spiral guide path is not limited to sewage and can be set as desired.

In addition, the components in the above embodiments may be replaced with well-known components as appropriate, and the above-described modifications may be combined as appropriate, without departing from the spirit of the present invention.

10 Vertical pipe 13 Downstream horizontal pipe 100 Vertical pipe main body 110 Center cylinder 121 Upper spiral guide path 121a Upper center cylinder 125 Lower spiral guide path 125a Lower center cylinder 125d Air outlet 125r Water inflow prevention roof

Claims (2)

a vertical pipe body made of a straight pipe and arranged in the vertical direction;
a plurality of central cylinders arranged in the vertical pipe body in the up-down direction;
an upper central cylinder having the central cylinder located at the top of the plurality of central cylinders and an upper spiral guide path formed in a spiral shape around the central cylinder;
a lower central cylinder having the central cylinder located at the lowest position among the plurality of central cylinders and a lower spiral guideway disposed below the upper central cylinder;
and
The plurality of central cylinders include at least one central cylinder guide path formed between the upper central cylinder and the lower central cylinder,
a ladder is installed between the upper central cylinder and the central cylinder guideway, and between the central cylinder guideway and the lower central cylinder ;
A water inflow prevention roof and an air exhaust port are provided on the upper part of the lower central cylinder.
Vertical pipe with spiral guideway. a lower end of the lower central cylinder body being located above a downstream horizontal pipe line arranged on a lower side surface of the vertical pipe body;
The vertical pipe with a spiral guideway according to claim 1 .