Vertical pipe with spiral guideway

Abstract

To provide a vertical pipe with spiral guide passage, which can suppress increase in number of spirals and length of a center tube even if head is large, and can ensure excellent maintainability.SOLUTION: A vertical pipe with spiral guide passage 10 has a vertical pipe body 100 that is a straight pipe and disposed in a vertical direction, a center tube body 110 disposed in the vertical direction inside the vertical pipe body 100, an upper center tube body having an upper spiral guide passage 121 that is spirally formed around the center tube body 110 and disposed on upper one of at least a pair of center tube bodies 110, and a lower center tube body having a lower spiral guide passage 125 that is spirally formed around the center tube body 110 and disposed below the upper center tube body. At least one hollow space is formed between the upper center tube body and the lower center tube body. A ladder is installed between the upper center tube body and the lower center tube body.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a vertical pipe with a spiral guideway through which liquid flows downward in a spiral manner. [Background technology]

[0002] As is well known, in sewerage systems, the main lines of river basin sewerage systems are planned to be located relatively deep underground, and the connection points with related public sewerage systems are high-head junctions, and the vertical pipes installed inside manholes are long, so the impact of the sewage flowing down to the bottom of the vertical pipe is large, and there is a risk of damaging the bottom.

[0003] Therefore, a technology is becoming popular in which a vertical pipe with a spiral guideway (a drop shaft with a central tube that rises and falls) is used as a vertical pipe to connect an upstream horizontal pipe located above and a downstream horizontal pipe located below (see, for example, Patent Document 1).

[0004] A vertical pipe with a spiral guideway (a central tube lifting drop shaft) generally has a spiral guideway formed around a central tube placed inside 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.

[0005] Furthermore, when the difference in head between the upstream and downstream horizontal pipes is large, 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.

[0006] On the other hand, in order to eliminate the economic disadvantage by reducing the number of spirals in the spiral guideway in a central tube lifting drop shaft (vertical tube with spiral guideway), a hollowed-out type has been proposed in which the upper spiral and lower spiral are separated and the spiral guideway in that part is omitted (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-179920 [Patent Document 2] Japanese Patent Application Laid-Open No. 2011-089338 Summary of the Invention [Problem to be solved by the invention]

[0008] The hollow-type vertical pipe with a spiral guideway (center-tube lifting drop shaft) has a center tube only on the upper spiral. The lower spiral does not have a center tube, and only has a ladder. While the above configuration has economic advantages, it also has the following problems. In other words, the wastewater flowing down from the upper spiral falls directly onto the lower spiral, causing the ladder to get wet unintentionally. Also, there is a possibility that impurities contained in the wastewater may get caught on the ladder. This poses a problem in that the ladder may hinder the flow of water.

[0009] The present invention has been made in consideration of the above-mentioned circumstances, and aims to provide a vertical pipe with a spiral guideway that can suppress an increase in the number of spirals and the length of the central tube even in the case of a high drop, and that can ensure excellent maintainability. [Means for solving the problem]

[0010] In order to solve the above problems, the present invention proposes the following means. The vertical pipe with a spiral guideway according to the present invention comprises a vertical pipe main body made of a straight pipe and arranged in an up-down direction, a central cylinder arranged in an up-down direction inside the vertical pipe main body, an upper central cylinder formed in a spiral shape around the central cylinder and having upper spiral guideways arranged on the upper side of at least a pair of the central cylinders, and a lower central cylinder formed in a spiral shape around the central cylinder and having lower spiral guideways arranged on the lower side of the upper central cylinder, wherein at least one hollow space is formed between the upper central cylinder and the lower central cylinder, and a ladder is installed between the upper central cylinder and the lower central cylinder.

[0011] According to this invention, at least one hollow space is formed between the upper and lower central cylinders, i.e., the lower central cylinder is located below the hollow space, and a ladder is installed between the upper and lower central cylinders. By providing a hollow space, it is possible to suppress an increase in the number of spirals and the length of the central cylinder, even in the case of a high drop. Furthermore, by providing a lower central cylinder, it is possible to prevent wastewater from splashing on the ladder installed inside the lower central cylinder. This prevents the ladder from getting wet unintentionally. Furthermore, by providing a ladder, it is possible to move between the upper and lower central cylinders even if a central cylinder is not installed in the hollow space. This ensures excellent maintainability.

[0012] The lower central cylinder may be provided at its upper portion with a water inflow prevention roof and an air exhaust port.

[0013] 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 can prevent 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 will decrease. The provision of an air outlet on the upper part of the lower central cylinder allows the air contained in the wastewater that flows down through the lower central cylinder to be removed from the interior of the wastewater via the lower central cylinder. Therefore, air can be prevented from flowing downstream from the vertical pipe with the spiral guide path, improving drainage efficiency.

[0014] The lower end of the lower central cylinder may be located above the downstream horizontal pipe.

[0015] According to this invention, the lower end of the lower center cylinder is located above the downstream horizontal pipe, which prevents water from entering through the downstream horizontal pipe from the lower end of the lower center cylinder. [Effects of the Invention]

[0016] According to the present invention, it is possible to provide a vertical pipe with a spiral guideway that can suppress an increase in the number of spirals and the length of the central tube even in the case of a high drop, and that can ensure excellent maintainability. [Brief explanation of the drawings]

[0017] [Figure 1] 5 is a schematic configuration diagram seen from the side indicated by arrow II in FIG. 4, illustrating the schematic configuration of the vertical pipe with a spiral guide path according to the first embodiment of the present invention. FIG. [Figure 2] 5 is a schematic configuration diagram seen from the side indicated by arrows II-II in FIG. 4, illustrating the schematic configuration of the vertical pipe with a spiral guide path according to the first embodiment. FIG. [Figure 3] 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. [Figure 4]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. [Figure 5] FIG. 2 is an enlarged view of the lower upper end slab according to the first embodiment. [Figure 6] FIG. 6 is a plan view of the lower top slab shown in FIG. 5. [Figure 7] This is a modified example in which a vertical tube with a spiral guideway has an intermediate central cylinder. DETAILED DESCRIPTION OF THE INVENTION

[0018] 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 arrow II in FIG. 4, and 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 diagram of a main portion of the vertical pipe with a spiral guideway, viewed from the side as indicated by arrows II-II in FIG. 4, and FIG. 4 is a conceptual diagram of a plan view 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 example in which a vertical pipe with a spiral guideway has an intermediate central cylinder. In FIGS. 1 to 7, dashed lines and cross sections may be used only where necessary.

[0019] 1 to 7, reference numeral 10 denotes a vertical pipe with a spiral guideway, reference numeral 100 denotes the vertical pipe body, reference numeral 110 denotes a central cylinder, reference numeral 120 denotes the spiral guideway, reference numeral 121 denotes the upper spiral guideway, reference numeral 125 denotes the lower spiral guideway, reference numeral 130 denotes a hollow space, reference numeral 140 denotes a flat guide member, reference numeral 150 denotes a support member for fixing the central cylinder, reference numeral O denotes the pipe axis of the vertical pipe body, and reference numeral P denotes the pitch. Reference numerals R1 and R2 conceptually indicate the direction of movement of sewage (liquid) in the upper spiral guideway and the lower spiral guideway. Dimensional relationships are exaggerated in some places.

[0020] 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, and a central cylinder fixing support member 150. In this embodiment, the vertical pipe body 100 and the central cylinder body 110 have a pipe axis O that is coaxial with each other.

[0021] 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 duct 12 and the downstream horizontal duct 13 are formed in directions perpendicular to each other when viewed from above.

[0022] 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 above the cylindrical wall portion, and a concrete bottom surface formed on the underside. An opening (not shown) is formed in the upper wall, and a manhole entrance (not shown) that leads to the ground is connected to the opening. Furthermore, for example, the manhole 11 may have an inner diameter of about several meters, and may be an assembly type formed by stacking a plurality of pipes, or may be formed from cast-in-place concrete.

[0023] As shown in Figures 1 to 4, the vertical pipe body 100 is formed from a cylindrical straight pipe with a vertical pipe hollow portion 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).

[0024] 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.

[0025] The central cylinder 110 is disposed in the vertical direction inside the vertical pipe main body 100. Specifically, as shown in Figs. 1 to 4, the central cylinder 110 is formed of a cylindrical straight pipe having a central cylinder cavity 111 formed therein, and is disposed in the manhole 11 along the pipe axis O in the vertical direction. The central cylinders 110 are arranged in at least one pair. In this embodiment, the central cylinders 110 are arranged in a pair, an upper central cylinder 110a and a lower central cylinder 110b. The upper central cylinder 110a refers to the central cylinder 110 that is particularly located at the upper side of the pair of central cylinders 110. The lower central cylinder 110b refers to the central cylinder 110 that is particularly located at the lower side of the pair of central cylinders 110. An intermediate central cylinder 110c is arranged between the upper central cylinder 110a and the lower central cylinder 110b. 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 be referred to as the central cylinder 110. Furthermore, 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).

[0026] Furthermore, a plurality of inspection ladders 115 are arranged at intervals along the vertical direction inside the central cylinder 110. Furthermore, a retractable hook ladder 116 is arranged below the inspection ladders 115. Furthermore, steps 114 are formed between the inspection ladders 115 and near the top end of the retractable hook ladder 116 .

[0027] The spiral guide path 120 guides the flow direction of the wastewater that flows down the vertical pipe body 100. Specifically, the spiral guide path 120 allows the wastewater to flow down the inside of the vertical pipe body 100 in a spiral shape, causing the wastewater to form 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 upper end to the lower end.

[0028] 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.

[0029] 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 upper end to the lower end. 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.

[0030] As shown in FIG. 3 , in the upper central cylinder 121a, the lower end of the upper spiral guide path 121 and the lower end of the upper central cylinder 110a are located at the same position in the direction of the tube axis O. Alternatively, the lower end of the upper central cylinder 110a may be located lower than the lower end of the upper spiral guide path 121. An upper end slab 121S is installed inside the upper central cylinder 110a near the lower end. An extension ladder 117 is installed on the upper end slab 121S. The extension ladder 117 can extend and retract within a range of 3 to 5 meters. When the extension ladder 117 is extended, it is located between the upper central cylinder 121a and the lower central cylinder 125a. In other words, the extension ladder 117 extends downward from the upper end slab 121S.

[0031] A lower upper end slab 125S is provided on the upper part of the lower central cylinder 110b. A safety fence 125f for preventing falls is provided on the outer periphery of the lower upper end slab 125S, as shown in Fig. 5. As shown in Fig. 5, the lower upper end slab 125S is provided with a water inflow prevention roof 125r and an air exhaust port 125d.

[0032] The water inflow prevention roof 125r prevents water from entering the lower center cylinder 110b from above in the direction of the tube 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 manufacturing of the lower center cylinder 110b.

[0033] 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 spiral guideway-equipped vertical pipe 10 is in use, and opens it to allow an operator to enter the interior during inspection. FRP is preferably used for the lid 125c.

[0034] 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 a 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 drainage. The air discharge port 125d serves to discharge the entrained air contained in the wastewater through the lower central cylinder 110b.

[0035] 3, water may splash from the bottom of the vertical pipe 10 with a spiral guideway 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 makes maintenance easy. 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.

[0036] Between the upper central cylinder 121a and the lower central cylinder 125a in the direction of the pipe axis O, the spiral guide path 120 and the central cylinder 110 are not arranged, and a hollow space 130 is formed into which liquid such as sewage can freely fall 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 pipe axis O, that is, 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 pipe axis O is preferably 3 to 5 m.

[0037] As shown in FIG. 3, the upper spiral guide path 121 has an upper end 122 disposed below the bottom surface of the upstream horizontal pipe 12, for example. The upper spiral guide path 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 path 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.

[0038] The lower spiral guideway 125 has a lower end 127 disposed 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.

[0039] Centrifugal force causes liquid such as sewage to flow along the inner circumferential surface 100B of the vertical pipe main body 100. Air is collected on the inner circumferential side (the pipe axis O side) and moves upward through the vertical pipe hollow portion 101. The sewage also attenuates its flow energy while flowing downward in a spiral shape (in the direction of arrow R2) along the upper spiral guide path 121, thereby preventing it from strongly colliding with the bottom surface portion 100C of the vertical pipe main body 100. The sewage (liquid) that has flowed down to the bottom surface portion 100C is then discharged through the downstream horizontal pipe 13.

[0040] As described above, the spiral guide path 120 has the role of increasing 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 pipe axis O direction of the vertical pipe body 100, a region not having the spiral guide path 120 can be provided up to 10D.

[0041] 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 Fig. 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.

[0042] 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 the lower central cylinder 110b. Furthermore, an upper terminal slab 121S is provided at the lower end of the intermediate central cylinder 110c, similar to the upper central cylinder 110a. An extension ladder 117 is provided on the upper terminal slab 121S.

[0043] A plurality of intermediate central cylinders 110c may be provided at intervals of 3 m 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, in order 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.

[0044] The middle spiral guide path is provided on the outer periphery of the middle central cylinder 110c. The middle spiral guide path has the same configuration as the upper spiral guide path 121 and the lower spiral guide path 125. In this embodiment, the middle spiral guide path has at least three spiral turns from the upper end to the lower end. Hereinafter, a configuration including the middle central cylinder 110c and the middle spiral guide path will be referred to as a middle central cylinder. One or more middle central cylinders may be provided in the direction of the tube axis O. When multiple middle center cylinders are provided, it is preferable that the middle center cylinder and the middle central cylinder 110c without the middle spiral guide path are provided alternately.

[0045] The flat guide member 140 is, for example, a rectangular flat plate member. The flat guide member 140 is arranged along the direction of the tube axis O. The material from which the flat guide member 140 is made can be set arbitrarily, but in this embodiment, it is made of, for example, stainless steel. The flat guide member 140 is provided on the outer circumferential 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.

[0046] 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 intermediate central cylinder 110c that does not have a central spiral guide path. 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.

[0047] The flat guide member 140 is formed, for example, so that its width corresponds to the radial distance between the vertical pipe main body 100 and the central cylinder 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 .

[0048] In addition, in this embodiment, as shown in FIG. 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, L = 1.0D when the inner diameter of the vertical pipe body 100 is D.

[0049] 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 interval 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 down to be sufficiently reduced. Furthermore, distance L ≧ 0.8D means that the distance 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 .

[0050] Furthermore, when viewed from above, the flat guide member 140 is disposed at the same position in the circumferential direction as the lower end 123 of the upper spiral guide path 121. In other words, the flat guide member 140 is disposed directly below the lower end 123 of the upper spiral guide path 121.

[0051] A lower end portion 142 of the flat guide member 140 is disposed so as to correspond to an upper end 126 of the lower spiral guide path 125 in the pipe axis O direction.

[0052] 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 pipe axis O.

[0053] Specifically, the lower end 142 of the flat guide member 140 is formed about a quarter turn forward (downstream) from the upper end 126 of the lower spiral guide path 125 in the circular direction when 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.

[0054] The central cylinder fixing support member 150 supports the upper central cylinder 121a, the lower central cylinder 125a, and the intermediate central cylinder 110c 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 a 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.

[0055] Next, the operation of the vertical pipe 10 with the spiral guideway will be described. (1) First, 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 has flowed into the vertical pipe body 100 falls 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 the periphery of 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 circumferential surface 100B of the vertical pipe main 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.

[0056] (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 in 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 dimension L (1.0D) from the lower end 123 of the upper spiral guide path 121, so that the circumferential flow velocity is sufficiently reduced. Here, the vertical pitch 1P of the upper spiral guide path 121 is approximately 0.8D. The pitch refers to the vertical (height) dimension when the upper spiral guide path 121 goes around an imaginary cylinder extending in the vertical direction, and the height of one round of the upper spiral guide path 121 is 1P (pitch).

[0057] (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 flat guide member 140 brings the scattered liquid together. 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 surface portion 100C is then discharged through the downstream horizontal pipe 13.

[0058] As described above, in the vertical pipe 10 with a spiral guideway according to this embodiment, at least one hollow space is formed between the upper central cylinder 121a and the lower central cylinder 125a. In other words, the lower central cylinder 125a is located below the hollow space. Furthermore, a ladder is installed between the upper central cylinder 121a and the lower central cylinder 125a. By providing the hollow space, it is possible to suppress an increase in the number of spirals and the length of the central cylinder, even in the case of a high drop. Furthermore, by providing the lower central cylinder 125a, it is possible to prevent wastewater from splashing on the ladder installed inside the lower central cylinder 125a. Therefore, it is possible to prevent the ladder from getting wet unintentionally. Furthermore, by providing the ladder, it is possible to move between the upper central cylinder 121a and the lower central cylinder 125a even if the central cylinder 110 is not installed in the hollow space. Therefore, excellent maintainability is ensured.

[0059] Additionally, 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. Here, the wastewater flowing down the lower spiral guide path 125 may contain air. If this air flows downstream from 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 the 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 from the vertical pipe 10 with a spiral guide path, improving drainage efficiency.

[0060] In addition, the lower end of the lower central cylinder 125a is located above the downstream horizontal pipe 13. This prevents water from entering through the downstream horizontal pipe 13 from the lower end of the lower central cylinder 125a.

[0061] 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.

[0062] 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 guideway is described as sewage or the like, but the liquid flowing into the vertical pipe 10 with a spiral guideway is not limited to sewage and can be set arbitrarily.

[0063] In addition, within the scope of the spirit of the present invention, the components in the above-described embodiments may be replaced with well-known components as appropriate, and the above-described modifications may be combined as appropriate. [Explanation of symbols]

[0064] 10 Vertical pipe 13 Downstream horizontal pipe 100 Vertical pipe body 110 Center cylinder 121 Upper spiral guideway 121a Upper center cylinder 125 Lower spiral guideway 125a Lower center cylinder 125d Air outlet 125r Water-proof roof

Claims

1. a vertical pipe body made of a straight pipe and arranged in the vertical direction; a central cylinder disposed vertically inside the vertical pipe body; an upper central cylinder having an upper spiral guideway formed spirally around the central cylinder and disposed on the upper side of at least one pair of the central cylinders; a lower central cylinder having a lower spiral guideway formed spirally around the central cylinder and disposed below the upper central cylinder; Equipped with At least one hollow space is formed between the upper central cylinder and the lower central cylinder, a ladder is installed between the upper central cylinder and the lower central cylinder; The upper part of the lower central cylinder is A water-resistant roof, An air outlet; characterized in that Vertical pipe with spiral guideway.

2. a lower end of the lower central cylinder being located above the downstream horizontal pipe; The vertical pipe with a spiral guideway according to claim 1 .

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