Vertical tube with spiral guideway

Abstract

To provide a vertical pipe with a spiral guide passage that can stably hold a central cylindrical body while ensuring a hydraulic function of a liquid flowing inside, and can ensure sufficient durability and excellent maintainability.SOLUTION: A vertical pipe 10 with a spiral guide passage comprises: a vertical pipe body 100; a central cylindrical body 110 that is arranged in the vertical pipe body 100; a spiral guide passage 120 that has an upper spiral guide passage 121 and a lower spiral guide passage 125 formed around the central cylindrical body 110; a hollow space 130 that is formed between the upper spiral guide passage 121 and the lower spiral guide passage 125; and a flat plate-shaped guide member 140 that is arranged in the hollow space 130. A distance L from a lower end of the upper spiral guide passage 121 to an upper end part of the flat plate-shaped guide member 140 is one pitch or more of the upper spiral guide passage.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] As is well known, in sewerage systems, the trunk 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. As a result, the vertical pipes installed inside manholes are long, and the impact of the sewage flowing down to the bottom of the vertical pipes is large, which can cause damage to the bottom.

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

[0004] A vertical pipe with a spiral guideway (central tube rising 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 by laminating FRP in a narrow space inside the vertical pipe body, which requires technically very specialized and difficult work.

[0005] Furthermore, when the upstream horizontal pipe and the downstream horizontal pipe have a high head difference, the central cylinder becomes longer and the number of turns of the spiral that form the spiral guideway also increases, which can make it 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 center tube rising drop shaft (vertical tube with a spiral guideway), a hollow-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] JP 2017-179920 A [Patent Document 2] JP 2011-089338 A Summary of the Invention [Problem to be solved by the invention]

[0008] However, while the above-mentioned hollow-out vertical tube with a spiral guideway (center tube rising drop shaft) has economic advantages, it has the problem that there are parts that are not fixed to the central tube, making it difficult to ensure that the side tubes have sufficient durability against the water flow and vibrations within the vertical tube body.

[0009] The present invention has been made in consideration of the above circumstances, and aims to provide a vertical pipe with a spiral guideway that can stably hold a central cylinder while ensuring the hydraulic function of the liquid flowing inside, and that can ensure sufficient durability and excellent maintainability. [Means for solving the problem]

[0010] In order to solve the above problems, the present invention proposes the following means. (1) A first aspect of the present invention is a vertical pipe with a spiral guide path, the vertical pipe having a vertical pipe body made of a straight pipe, a central cylinder arranged vertically inside the vertical pipe body, and an upper spiral guide path formed in a spiral shape around the central cylinder, the upper spiral guide path being arranged on the upper side of at least a pair of the central cylinders, and a lower spiral guide path being arranged on the lower side of the upper spiral guide paths, the spiral guide path guiding a liquid flowing down between the vertical pipe body and the central cylinder in a spiral shape, the upper spiral guide path and the lower spiral guide path being at least one hollow space formed between the upper spiral guide path and the lower spiral guide path, and a flat guide member arranged in the hollow space, connecting an inner circumferential surface of the vertical pipe body and an outer circumferential surface of the central cylinder, and formed in a flat shape along the pipe axis of the vertical pipe body, wherein a distance L from a lower end of the upper spiral guide path to an upper end of the flat guide member in the pipe axis direction is one pitch or more of the upper spiral guide path.

[0011] According to the vertical pipe with a spiral guideway of this invention, a flat guide member is formed in the hollow space arranged between the upper spiral guideway and the lower spiral guideway, and the outer peripheral surface of the central cylinder is connected to the inner peripheral surface of the vertical pipe main body by the flat guide member, so that the central cylinder is fixed and supported to the vertical pipe main body. In addition, since the distance L between the lower end of the upper spiral guide path and the upper end of the flat guide member in the axial direction of the pipe is equal to or greater than one pitch of the upper spiral guide path, the liquid that has flowed in a spiral shape in the upper spiral guide path falls freely due to gravity after leaving the upper spiral guide path, and the circumferential flow velocity of the liquid as it goes around in a spiral shape is decelerated before it collides with the flat guide member. As a result, the liquid is prevented from bouncing back when it collides with the flat guide member, and the liquid is rectified downward after it collides with the flat guide member. The liquid that has been rectified by the flat guide member is guided by the lower spiral guide path, and flows downward while being guided in a spiral shape by the lower spiral guide path. As a result, the central cylinder is stably held while ensuring the hydraulic function of the liquid flowing inside the vertical tube body, and sufficient durability and excellent maintainability can be ensured.

[0012] Here, the lower end of the upper spiral guide passage refers to the lower end of the surface along which the liquid flows in the upper spiral guide passage, in other words, the lowest position in the axial direction of the flow down surface (upper surface) of the spiral plate material that constitutes the upper spiral guide passage. Similarly, the upper end of the lower spiral guideway is the lowest position in the axial direction of the flow down surface (upper surface) of the lower spiral guideway.

[0013] In addition, it is possible to arbitrarily set whether or not the flat guide member connects the vertical tube body and the central cylinder over the entire length in the tube axial direction, and the flat guide member and the vertical tube body, and the flat guide member and the central cylinder may be configured so as not to be connected over part of the tube axial direction. In addition, it is preferable that the lower end of the flat guide member is formed forward of the upper end of the lower spiral guide path by a (1 / 4) rotation in the circumferential direction when the liquid flows from upstream to downstream, i.e., about 90° around the axis. Note that the pitch is the vertical dimension (height direction) when the spiral guide path goes around a virtual cylinder extending in the vertical direction, and is the height of one revolution of the spiral guide path.

[0014] (2) A second aspect of the present invention is In the vertical pipe with a spiral guideway of the first aspect, The vertical pipe has an inner diameter D, and L is set to be equal to or greater than 0.8D.

[0015] In the vertical pipe with a spiral guideway of the present invention, when the distance from the lower end of the upper spiral guideway in the axial direction of the pipe to the upper end of the flat guide member is L and the inner diameter of the vertical pipe body is D, L is set to be greater than or equal to 0.8D. Therefore, the liquid that has flowed spirally through the upper spiral guideway falls freely due to gravity after leaving the upper spiral guideway, and its circumferential flow velocity as it travels around in a spiral manner is decelerated before it collides with the flat guide member. As a result, the central cylinder is stably held while ensuring the hydraulic function of the liquid flowing inside the vertical tube body, and sufficient durability and excellent maintainability can be ensured.

[0016] In addition, it is possible to arbitrarily set whether or not the flat guide member connects the vertical tube body and the central cylinder body over the entire length in the tube axial direction. In addition, it is preferable that the lower end of the flat guide member is formed approximately (1 / 4) of a rotation forward of the upper end of the lower spiral guide path in the circular direction when the liquid flows from upstream to downstream.

[0017] (3) A third aspect of the present invention is characterized in that it comprises a vertical pipe body made of a straight pipe and arranged in the vertical direction, a central cylinder arranged in the vertical direction inside the vertical pipe body, a spiral guide path formed in a spiral shape around the central cylinder and arranged on the upper side of at least a pair of the central cylinders, and a lower spiral guide path arranged on the lower side of the upper spiral guide paths, and which spirally guides a liquid flowing down between the vertical pipe body and the central cylinder, at least one hollow space formed between the upper spiral guide path and the lower spiral guide path, and a flat guide member arranged in the hollow space, connecting an inner circumferential surface of the vertical pipe body and an outer circumferential surface of the central cylinder, formed in a flat shape along a pipe axis of the vertical pipe body, and extending from a lower end of the upper spiral guide path along the pipe axis.

[0018] By providing a flat guide member extending downward from the lower end of the upper spiral guide passage, its function as a guide plate that guides flowing water downward can be enhanced, and the configuration is also effective in terms of supporting the central cylinder.

[0019] (4) In the vertical pipe with a spiral guideway described in any one of (1) to (3) above, the flat guide member may be arranged, when viewed in a plane, at the same circumferential position around the pipe axis as the lower end of the upper spiral guideway.

[0020] In the vertical pipe with a spiral guide path of the present invention, in which the spacing L is one pitch or more of the upper spiral guide path, the flat guide member is positioned at the same circumferential position (directly below in the vertical direction) as the lower end of the upper spiral guide path when viewed in a plane, so that the liquid coming out of the upper spiral guide path reliably goes around the pipe axis before colliding with the flat guide member. As a result, the circumferential flow velocity and centrifugal force of the liquid are sufficiently reduced before the liquid collides with the flat guide member.

[0021] (5) The vertical pipe with a spiral guideway according to any one of (1) to (4) above may include a central cylinder fixing support member for fixing the central cylinder to the vertical pipe main body.

[0022] According to the vertical pipe with a spiral guideway of the present invention, a central cylinder fixing support member is provided, and the central cylinder is fixed and supported to the vertical pipe main body. Therefore, even if a hollow space is formed, even if the liquid flowing down the vertical pipe main body collides with the flat guide member, the occurrence of vibration, etc. in the central cylinder can be suppressed.

[0023] (6) In the vertical pipe with a spiral guideway described in (5) above, the central cylinder fixing support member has a tubular portion that holds the central cylinder and a support arm portion that connects the tubular portion to the vertical pipe main body, and when viewed in a plane, the support arm portion is connected to the tubular portion at the upstream side of the liquid flowing down the spiral guideway and to the vertical pipe main body at the downstream side of the flowing liquid, and may extend along the tangent direction of the outer peripheral surface of the tubular portion.

[0024] According to the vertical pipe with a spiral guideway of the present invention, the central cylinder fixing support member has a cylindrical section that holds the central cylinder, and a support arm section that connects the cylindrical section to the vertical pipe body, and in a plan view, the support arm section is connected to the cylindrical section on the upstream side of the liquid flowing down the spiral guideway and to the vertical pipe body on the downstream side of the flowing liquid, and extends along the tangential direction of the outer circumferential surface of the cylindrical section, so that hydraulic jumps are suppressed when the flowing liquid collides with the central cylinder. Also, it is possible to suppress the application of a large force to the central cylinder fixing support member when the flowing liquid collides with the central cylinder. As a result, the central cylinder can be stably supported with respect to the vertical pipe body by the central cylinder fixing support member. Effect of the Invention

[0025] According to the vertical pipe with a spiral guideway of the present invention, the central cylinder is stably supported while ensuring the hydraulic function of the liquid flowing inside, and sufficient durability and excellent maintainability can be ensured. [Brief description of the drawings]

[0026] [Figure 1] 5 is a schematic configuration diagram seen from a side view indicated by an arrow II in FIG. 4, illustrating the schematic configuration of the vertical pipe with a spiral guideway according to the first embodiment of the present invention. FIG. [Diagram 2] 5 is a schematic configuration diagram seen from a side view indicated by arrows II-II in FIG. 4, illustrating the schematic configuration of the vertical pipe with a spiral guideway according to the first embodiment. FIG. [Diagram 3] 5 is a side view taken along line II-II in FIG. 4, illustrating a main portion of the vertical pipe with a spiral guideway according to the first embodiment. FIG. [Figure 4] 4 is a conceptual diagram illustrating a schematic configuration of a vertical pipe with a spiral guideway according to the first embodiment, taken along line IV-IV in FIG. 1 as viewed from above. [Diagram 5] FIG. 2 is a plan view for explaining a schematic configuration of a central cylinder fixing and supporting member in the vertical pipe with a spiral guideway according to the first embodiment. [Figure 6] FIG. 2 is a side view for explaining a schematic configuration of a central cylinder fixing and supporting member in the vertical pipe with a spiral guideway according to the first embodiment. [Figure 7] FIG. 2 is a side view illustrating an example of a schematic configuration of a bolt fixing portion of a central cylinder fixing support member in the vertical pipe with a spiral guideway according to the first embodiment. [Figure 8] 4 is a side view illustrating an example of a schematic configuration of a receiving fitting of a central cylinder fixing support member in the vertical pipe with a spiral guideway according to the first embodiment. FIG. [Figure 9] FIG. 2 is a side view showing a central cylinder joint in the vertical pipe with a spiral guideway according to the first embodiment. [Figure 10] FIG. 2 is a partial cross-sectional view showing a central cylinder joint in a vertical pipe with a spiral guideway according to the first embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] First Embodiment 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, as 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, as viewed from the side as indicated by arrows II-II in Fig. 4. Fig. 3 is a schematic diagram of a vertical pipe with a spiral guideway, as 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. In Figs. 1 to 8, dashed lines and cross sections may be used only where necessary.

[0028] In Figures 1 to 4, reference numeral 10 denotes a vertical pipe with a spiral guideway, reference numeral 100 denotes a vertical pipe body, reference numeral 110 denotes a central cylinder, reference numeral 120 denotes a spiral guideway, reference numeral 121 denotes an upper spiral guideway, reference numeral 125 denotes a lower spiral guideway, reference numeral 130 denotes a hollow space, reference numeral 140 denotes a flat guide member, reference numeral 150 denotes a central cylinder fixing support member, reference numeral O denotes a pipe axis of the vertical pipe body, and reference numeral P denotes a 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. Also, some dimensional relationships are emphasized.

[0029] 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 110 have the same pipe axis O.

[0030] The vertical pipe 10 with the 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 arranged so as to be aligned on the same straight line when viewed in a plan view.

[0031] Manhole 11 is made of concrete or the like, and has a cylindrical wall portion arranged so that its axis runs vertically, and an upper wall portion (not shown) formed on the upper side of the cylindrical wall portion, and a concrete bottom surface is formed on the lower surface. An opening (not shown) is formed in the upper wall, and a manhole entrance (not shown) leading to the ground is connected to the opening. Also, for example, the manhole 11 may be formed to have an inner diameter of about several meters, and may be of a prefabricated type formed by stacking a plurality of pipes, or may be formed of cast-in-place concrete.

[0032] As shown in Figures 1 to 4, the vertical pipe body 100 is formed of a cylindrical straight pipe with a vertical pipe hollow portion 101 formed therein, and is arranged in the manhole 11 along the pipe axis O in the vertical direction. The material for forming the vertical pipe body 100 can be set arbitrarily, but in this embodiment, it is formed of, for example, FRP (Fiber Reinforced Plastics).

[0033] 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.

[0034] As shown in Figures 1 to 4, the central tube 110 is formed of a cylindrical straight tube with a central tube hollow portion 111 formed therein, and is arranged in the manhole 11 in the vertical direction along the tube axis O. Furthermore, the material for forming the central cylinder 110 can be set arbitrarily, but in this embodiment, it is formed of, for example, FRP (Fiber Reinforced Plastics).

[0035] A plurality of inspection ladders 115 are arranged at intervals in the vertical direction inside the central cylinder 110. An inclined inspection ladder 116 is arranged below the inspection ladders 115. Furthermore, steps 114 are formed between the inspection ladders 115 and near the upper end of the inclined inspection ladder 116 .

[0036] As shown in FIGS. 1 to 4, the spiral guide path 120 is connected to the outer circumferential surface 110A of the central cylinder 110, and is formed in a counterclockwise spiral shape with the tube axis O as the center when viewed in a plan view. The material forming the spiral guide path 120 can be set arbitrarily, but in this embodiment, it is formed of, for example, FRP (Fiber Reinforced Plastics). Moreover, the spiral guide passage 120 is connected by, for example, applying FRP lamination to the inner peripheral surface 100B of the vertical pipe body 100.

[0037] As shown in Figs. 1 to 4, the spiral guide path 120 includes an upper spiral guide path 121 disposed on the upper side in the direction of the tube axis O, and a lower spiral guide path 125 disposed on the lower side. Furthermore, the spiral guide path 120 is not arranged between the upper spiral guide path 121 and the lower spiral guide path 125 in the direction of the pipe axis O, and a hollow space 130 is formed through which liquids such as sewage can fall freely due to gravity.

[0038] The hollow space 130 is disposed between the upper spiral guideway 121 and the lower spiral guideway 125, and in this embodiment, for example, one hollow space 130 is formed.

[0039] For example, the upper end 122 of the upper spiral guideway 121 is 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 downward in a spiral shape (in the direction of arrow R1) around the central cylinder 110 along the upper spiral guide passage 121, and then discharges it from the lower end 123 into the hollow space 130.

[0040] 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 shape around the central cylinder 110 along the lower spiral guide path 125, and then discharge it from the lower end 127. The lower end 127 of the lower spiral guide path 125 can be set at a height of, for example, about 2 m above the bottom surface portion 100c. Setting it at this height can prevent water from entering the central cylinder 110 from below. For example, even if a drain pipe 14 with a large pipe diameter is arranged outside the downstream horizontal pipe 13 as shown by the two-dot chain line in FIG. 2, water intrusion into the central cylinder 110 can be suppressed.

[0041] Centrifugal force causes liquid such as sewage to flow along the inner circumferential surface 100B of the vertical pipe 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 flows downward in a spiral shape (in the direction of arrow R2) along the upper spiral guide path 120 while attenuating its flow energy, and is prevented from strongly colliding with the bottom surface portion 110C of the vertical pipe body 100. The sewage (liquid) that has flowed down to the bottom surface portion 110C is discharged through the downstream horizontal pipe 13.

[0042] The flat guide member 140 is, for example, a rectangular flat plate member, and is disposed in the hollow space 130 along the tube axis O direction. The material from which the flat guide member 140 is made can be selected arbitrarily, but in this embodiment, it is made of, for example, stainless steel.

[0043] Further, 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 (1 / 2 the difference in inner diameter). When viewed in a plan view, the flat guide member 140 has an outer peripheral edge 140A connected to an inner peripheral surface 100B of the vertical pipe main body 100, and an inner peripheral edge 140B connected to an 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 body 100 .

[0044] In addition, when the inner diameter of the vertical pipe body 100 is D, the upper end 141 of the flat guide member 140 has a distance L in the direction of the pipe axis O from the lower end 123 of the upper spiral guide passage 121, which is set to distance L = 1.0D. As another example, the upper end 141 of the flat guide member 140 may be disposed directly below the lower end 123 of the upper spiral guide path 121 . In Figure 1, a structure in which the upper end 141 of a flat guide member 140 is located at a position with a distance L = 1.0D is shown by a solid line, and a structure in which the upper end 141' of a flat guide member 140' is located immediately below the lower end 123 of the upper spiral guide path 121 is shown by a dotted line.

[0045] The position of the upper end 141 of the flat guide member 140 in the direction of the tube axis O may be set arbitrarily within the range of the distance L≧0.8D. In this configuration, setting the distance L from the lower end 123 of the upper spiral guide path 121 to the upper end 141 of the flat guide member 140 in the direction of the pipe axis O 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, and the circumferential speed of the liquid flowing down can be sufficiently decelerated. Also, distance L ≧ 0.8D means that the distance L is lower than 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 . In addition, when the upper end 141' of the flat guide member 140' is installed directly below the lower end 123 of the upper spiral guide passage 121, the sewage flowing out of the upper spiral guide passage 121 will circle slightly around the central cylinder 110 before colliding with the flat guide member 140.

[0046] Further, the flat guide members 140, 140' are disposed at the same position in the circumferential direction with respect to the lower end 123 of the upper spiral guide path 121 when viewed in a plan view. In other words, the flat guide members 140, 140' are disposed directly below the lower end 123 of the upper spiral guide path 121.

[0047] A lower end 142 of the flat guide member 140 is disposed to correspond to an upper end 126 of the lower spiral guide path 125 in the tube axis O direction. That is, the flat guide member 140 is formed in the range from a position spaced apart by 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 tube axis O direction. In addition, the flat guide member 140' is formed in the direction of the pipe axis O from just below the lower end 123 of the upper spiral guide path 121 to a midpoint between the lower end 123 of the upper spiral guide path 121 and the upper end 126 of the lower spiral guide path 125.

[0048] Specifically, the lower end 142 of the flat guide member 140 is formed about 1 / 4 turn forward (downstream) from the upper end 126 of the lower spiral guide passage 125 in the circular direction when the sewage (liquid) flows from upstream to downstream, in other words, about 90° forward around the axis O. The circumferential position of the lower end 142 of the flat guide member 140 is not limited to being ¼ turn forward of the upper end 126 of the lower spiral guide path 125, but may be set arbitrarily.

[0049] Hereinafter, the central cylinder fixing and supporting member will be described with reference to FIGS. Fig. 5 and Fig. 6 are a plan view and a side view for explaining the schematic configuration of the central cylinder fixing support member in the vertical pipe with a spiral guideway. Fig. 7 is a side view for explaining an example of the schematic configuration of the bolt fixing part of the central cylinder fixing support member, and Fig. 8 is a side view for explaining the schematic configuration of the vertical pipe connecting part of the central cylinder fixing support member. Fig. 9 is a side view of the central cylinder joint part, and Fig. 10 is a partial cross-sectional view showing the central cylinder joint part. In the figure, reference numeral 151 denotes a support member, reference numeral 151S denotes a cylindrical portion, reference numeral 154 denotes a support arm portion, reference numeral 157 denotes a vertical pipe connecting portion, and reference numeral 159 denotes a relative position adjustment portion.

[0050] The central cylinder 110 is formed, for example, by joining together a plurality of cylinders 110a having the same inner and outer diameters. As an example of the joint between the cylinders 110a, a joint structure can be adopted in which a flange portion 110b is provided at the end of one of the cylinders 110a to be joined, a flange portion 110b is provided at the end of the other cylinder 110a, and the flange portions 110b are butted together, as shown in Figures 6 and 9. As shown in FIGS. 6 and 9, the cylindrical bodies 110a are joined to each other by a plurality of bolts 112 which pass through the butted portions of the flange portions 110b and nuts 113 which screw onto these bolts 112. If the flange portion 110b is used to join the cylindrical bodies 110a, 110a, the joint between the cylindrical bodies 110a can be made strong.

[0051] As shown in Fig. 5, the central cylinder fixing support member 150 includes, for example, three support members 151 arranged to surround the central cylinder 110 in the circumferential direction. The three support members 151 are provided at positions that do not interfere with the position of the flange portion 110b. For example, as shown in Fig. 6, the three support members 151 are provided slightly below the flange portion 110b. Note that the positions at which the support members 151 are provided are not limited to the positions shown in Fig. 6, and may be any positions that do not interfere with the flange portion 110b. The position in the tube axis O direction (vertical position) at which the central cylinder fixing support member 150 is positioned can be set arbitrarily within the hollow space 130, but it is preferable to position it in a part where the flat guide members 140, 140' are not positioned in order to maximize the fixing effect.

[0052] In the case of the flat guide member 140 shown by solid lines in Figure 1, for example, it is positioned at the middle position in the vertical direction of the hollowed out space 130, in other words, at the middle position between the lower end 123 of the upper spiral guide path 121 and the upper end 141 of the flat guide member 140 (for example, the center in the vertical direction). The position at which the central cylinder fixing support member 150 is placed can be set arbitrarily, and when the vertical dimension of the hollow space 130 is set to be long, it is preferable to place multiple central cylinder fixing support members 150 in the hollow space 130 so that their mutual vertical dimensions are within 4 m, for example.

[0053] As shown in FIG. 5 , the support member 151 includes, for example, an arc-shaped holding portion 152, a support arm portion 154 extending from the arc-shaped holding portion 152 toward the outer periphery (the vertical pipe body 100 side), a vertical pipe connecting portion 157 connected to a first end portion (outer periphery side end portion) 154A of the support arm portion 154 and connected to the inner periphery surface 100B of the vertical pipe body 100, and a relative position adjustment portion 159.

[0054] The arc-shaped holding portion 152 is formed, for example, in an arc shape with a radius of curvature corresponding to the radius of curvature of the outer circumferential surface of the central cylinder 110. In addition, this arc shape is set to a central angle of 120° with the tube axis O as the center.

[0055] The arc-shaped holding portion 152 also has, at both ends of the arc shape, connecting flange portions 152F that are bent toward the outer periphery in plan view and formed into a substantially L-shape. Further, the coupling flange portion 152F is formed with a through hole (not shown) for inserting a fastening member (for example, a bolt and a nut) 152T therethrough.

[0056] Then, as shown in FIG. 5, three central cylinder fixing support members 150 are arranged around the central cylinder 110, and adjacent flange portions 152F are joined together by fastening members 152T, whereby a substantially cylindrical tubular portion 151S is formed by these three arc-shaped holding portions 152. The outer circumferential surface 110A of the central cylinder 110 can be held by the cylindrical portion 151S.

[0057] As shown in Figure 5, when viewed in a plane, the support arm portion 154 has a second end (inner circumference end) 154B located on the upstream side of the liquid flowing down the spiral guide path 120, which is connected to the outer circumference surface 152A of the arc-shaped holding portion 152, and a first end (outer circumference end) 154A located on the downstream side, which is connected to the inner circumference surface 100B of the vertical pipe main body 100 via the vertical pipe connection portion 157. As a result, the support arm portion 154 is disposed along the spiral flow in the direction of the arrow R1.

[0058] 6, the support arm portion 154 is set to have the same height as the arc-shaped holding portion 152, for example. Moreover, the support arm portion 154 is configured, for example, by an H-shaped member whose cross section when viewed along the longitudinal direction is formed into a substantially H-shape.

[0059] 7, the support arm portion 154 has a through hole 154H for connection to the vertical pipe connection portion 157 formed in a first end portion (end portion on the outer circumferential side) 154A, for example. Specifically, three through holes 154H are formed along the longitudinal direction of the support arm portion 154 at the upper and lower portions of the two flange portions F arranged opposite each other with the web W of the mold material therebetween, penetrating in the thickness direction of the flange portions F.

[0060] In addition, the support arm portion 154 has, for example, a first end (outer peripheral end) 154A, a rib-like protrusion 154G that is positioned on the extension line of the web W and protrudes outward on the outer surfaces of the two flange portions F. 5, the support arm portion 154 extends in a tangential direction to the outer circumferential surface 152A of the arc-shaped holding portion 152 when viewed in a plan view. As a result, the support arm portion 154 is formed, for example, generally along a direction approximately tangential to the outer circumferential surface 110A of the central cylinder 110.

[0061] As shown in FIG. 8, the vertical pipe connecting portion 157 is formed, for example, by processing a channel-shaped member 158 having a bottom wall portion 158A and rising wall portions 158B rising upward from both widthwise ends of the bottom wall portion 158A. The second end 154B of the support arm portion 154 is inserted into the space formed by the bottom wall portion 158A and the rising wall portion 158B, thereby forming a connecting member that connects the support arm portion 154 and the vertical pipe main body 100.

[0062] Specifically, as shown in FIG. 8, for example, an attachment wall 157F is connected to the end face of a first end (outer peripheral end) 157A of a channel-shaped profile 158, and an approximately triangular stay wall 157S is connected along the longitudinal direction of the channel-shaped profile 158 from the underside of the bottom wall 158A to the attachment wall 157F.

[0063] Further, the mounting wall portion 157F is formed with a through hole 157J penetrating in the thickness direction. Then, a fastening bolt 151T is inserted into the through hole 157J, and the mounting wall portion 157F is attached to the inner peripheral surface 100B of the vertical pipe main body 100 by inserting the fastening bolt 151T into the through hole 157J, whereby the central cylinder fixing support member 150 is fixed to the vertical pipe main body 100. The number of central cylinder fixing support members 150 and the intervals at which they are installed can be set arbitrarily, but it is preferable that they are installed within an interval of, for example, about 2 m. In this embodiment, one central cylinder fixing support member 150 is provided.

[0064] Further, in the rising wall portion 158B, at a position corresponding to the through hole 154H of the support arm portion 154, a long hole 157H is formed which penetrates the channel-shaped member 158 in the thickness direction along the longitudinal direction thereof. Further, the rising wall portion 158B is formed with a guide groove 157G extending along the longitudinal direction, for example, penetrating in the thickness direction and into which the stripe-like protrusion 154G can be inserted.

[0065] Then, the support arm portion 154 is inserted into the channel-shaped member 158 of the vertical pipe connecting portion 157 while the strip-like protrusion portion 154G is guided by the guide groove 157G. Then, the support arm portion 154 and the vertical pipe connecting portion 157 are connected by inserting and fastening a fastening member (e.g., a bolt or a nut) 157T into the long hole 157H and the through hole 154H.

[0066] In this embodiment, the long hole 157H constitutes a relative position adjustment portion 159 for adjusting the relative position between the central cylinder 110 and the vertical pipe body 100. Specifically, when the fastening member (e.g., a bolt or nut) 157T is inserted into and connected to the support arm portion 154 and the vertical pipe connection portion 157, the relative position of the central cylinder 110 and the vertical pipe main body 100 is adjusted by adjusting the fastening member (e.g., a bolt or nut) 157T to any position in the long hole 157H.

[0067] 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 of, for example, stainless steel. Forming the central cylinder fixing support member 150 from stainless steel is preferable because it prevents the central cylinder fixing support member 150 from corroding even when it comes into contact with sewage or the like inside the vertical pipe 10 with the spiral guideway. The central cylinder fixing support member 150 may be made of a material other than stainless steel, or may be made of a plurality of materials.

[0068] 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 flows 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 thereon also increases. At this time, the liquid flows due to centrifugal force along the inner circumferential surface 100B of the vertical pipe main body 100. Then, the air is collected on the inner circumferential side (the pipe axis O side) and moves upward through the vertical pipe hollow portion 101.

[0069] (4) The liquid is then discharged from the lower end 123 of the upper spiral guideway 121 into the hollow space 130 . In the case of the flat guide member 140 shown by the solid line in Fig. 1, the liquid discharged from the upper spiral guide path 121 may break up in the hollow space 130 as its falling speed is accelerated by gravity and its circumferential speed is decelerated by the upper spiral guide path 121. This broken up liquid makes one revolution around the central cylinder 110 and then collides with the flat guide member 140. This makes it possible to prevent the broken up liquid from becoming misty or granular. The spiral flow is guided downward by dimension L (0.8D) from lower end 123 of upper spiral guide path 121, so that the circumferential flow velocity is sufficiently decelerated. Here, 1P (pitch) of upper spiral guide path 121 in the vertical direction is approximately 0.8D. Note that pitch refers to the vertical (height) dimension when upper spiral guideway 121 goes around an imaginary cylinder extending in the vertical direction, and the height of one revolution of upper spiral guideway 121 is 1P (pitch). In the case of the flat guide member 140' indicated by the two-dot chain line in Figure 1, the liquid discharged into the hollow space 130 circles slightly around the central cylinder 110 before colliding with the flat guide member 140', and the circumferential flow velocity is decelerated.

[0070] (5) The liquid that collides with the flat guide members 140, 140' is rectified downward (substantially vertically, in the direction of arrow V) along the flat guide members 140, 140'. In other words, if any scattered liquid is generated, it is collected by the flat guide members 140, 140'. The liquid, which has been rectified by the flat guide members 140, 140', flows into the hollow space 130 or the lower spiral guide path 125 from the lower ends 142, 142' of the flat guide members 140, 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 in the upper spiral guide path 121. The liquid that flows down in a spiral shape in the direction of the arrow R2 along the lower spiral guide path 125 has a small vertical flow velocity, and is therefore prevented from colliding strongly with the bottom surface portion 110C of the vertical pipe main body 100. In addition, noise, vibration, and splashes caused by the collision of the liquid are suppressed. The sewage (liquid) that has flowed down to the bottom portion 110C is discharged through the downstream horizontal pipe 13.

[0071] In the vertical pipe 10 with a spiral guide path according to the first embodiment, when a flat guide member 140 is formed in the hollow space 130, an upper end 141 of the flat guide member 140 is disposed below a lower end 123 of the upper spiral guide path 121 in the pipe axis O direction at a distance L≧1.0D (D: inner diameter of the vertical pipe main body 100). Therefore, the spiral flow in the upper spiral guide path 121 collides with the flat guide member 140 after the circumferential flow velocity and centrifugal force are reduced, so that rebounding upon collision with the flat guide member 140 is suppressed and the flow is rectified into a downward flow by the flat guide member 140. In the first embodiment, when the upper end 141' of the flat guide plate 140' is provided directly below the lower end 123 of the upper spiral guide path 121, the liquid flowing in in a spiral shape is straightened by the flat guide plate 140, thereby obtaining a good straightening effect. Furthermore, by providing a flat guide member 140' extending downward from the lower end of the upper spiral guide passage 121, the function of the guide plate that guides the flowing water downward can be enhanced, and this is also an effective configuration from the viewpoint of supporting the central cylinder 110.

[0072] The liquid rectified by the flat guide members 140, 140' is guided by the lower spiral guide path 125 and flows substantially downward. As a result, the central cylinder 110 is stably held while ensuring the hydraulic function of the liquid flowing within the vertical pipe body 100, and the vertical pipe 10 with the spiral guideway can be ensured to have sufficient durability and excellent maintainability.

[0073] Furthermore, according to the vertical pipe 10 with a spiral guideway, the flat guide member 140 is positioned at the same circumferential position (directly below in the vertical direction) as the lower end 123 of the upper spiral guideway 121 when viewed in a plane, so that liquid such as sewage emerging from the upper spiral guideway 121 reliably makes a full circle around the pipe axis 0 before colliding with the flat guide member 140. As a result, the circumferential flow velocity of the liquid is sufficiently reduced before it collides with the flat guide member 140 .

[0074] Furthermore, according to the vertical pipe 10 with a spiral guideway, the central cylinder 110 is fixed and supported to the vertical pipe main body 100 by the central cylinder fixing support member 150, so that even if a hollow space 130 is formed and the liquid flowing down inside the vertical pipe main body 100 collides with the flat guide member 140, the occurrence of vibrations or the like in the central cylinder 110 can be suppressed.

[0075] Furthermore, according to the vertical pipe 10 with a spiral guideway, when viewed in a plane, the central cylinder fixing support member 150 is connected to the central cylinder 110 on the upstream side of the spiral flow and is connected to the vertical pipe main body 100 on the downstream side, and the support arm portion 154 is formed along the tangential direction of the outer peripheral surfaces of the tubular portion 151S and the central cylinder 110, thereby suppressing hydraulic jumps when flowing liquids collide.

[0076] In addition, the vertical pipe 10 with the spiral guide path can prevent a large force from being applied to the central cylinder fixing support member 150 when the flowing liquid collides with the central cylinder fixing support member 150. As a result, the central cylinder 110 can be stably held.

[0077] Furthermore, according to the vertical pipe 10 with a spiral guideway, the central cylinder fixing support member 150 is provided with a relative position adjustment portion 159, so that the relative position of the central cylinder 110 and the vertical pipe main body 100 can be easily and efficiently adjusted. As a result, the vertical pipe 10 with the spiral guideway can be installed on-site.

[0078] The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention.

[0079] For example, in the above embodiment, the vertical pipe 10 with the spiral guide path is provided with one hollow space 130, but it may be configured to have two or more (plural) hollow spaces. Furthermore, when multiple hollowed-out spaces are arranged, it is possible to arbitrarily set whether or not to arrange flat guide members 140 or flat guide members 140' in all of the hollowed-out spaces, and flat guide members 140 or flat guide members 140' may be arranged in some of the hollowed-out spaces.

[0080] In addition, in the above embodiment, a case has been described in which one flat guide member 140 or flat guide member 140' is arranged for one hollow space 130. However, for example, multiple flat guide members 140 or flat guide members 140' may be arranged at circumferential positions of the tube axis O of the central tube 110 in the hollow space 130.

[0081] In addition, in the above embodiment, the case has been described where the flat guide members 140, 140' are formed by connecting the central cylinder 110 and the vertical pipe body 100, but a configuration in which the flat guide member 140 or the flat guide member 140' is not connected to the central cylinder 110 or the vertical pipe body 100 in a part of the direction of the pipe axis O may also be used.

[0082] In the above embodiment, the flat guide member 140 has a distance L from the lower end 123 of the upper spiral guide member 121 to the flat guide member 140, and the inner diameter of the vertical pipe body 100 is D. In the above embodiment, the distance L is set to 1.0D, but the distance L may be set to any value within the range of 1.0 pitch or more or L≧0.8D. The distance L is more preferably 1.2 pitch or more or L≧0.8D. If the distance L is too large, it becomes difficult to rectify the scattered liquid, so it is preferable that the distance L is 2.4 (pitch) or less or L≦2.0D.

[0083] In addition, in the above embodiment, the case where the central cylinder fixing support member 150 is positioned at the middle position in the vertical direction of the hollow space 130 has been described, but the number of central cylinder fixing support members 150 and their vertical positions may be set arbitrarily. For example, when the vertical dimension of the hollow space 130 exceeds 4 m, it is preferable to arrange a plurality of central cylinder fixing support members 150 in the hollow space 130.

[0084] In the above embodiment, the central cylinder fixing support member 150 is made of stainless steel, but the material for forming the central cylinder fixing support member 150 can be set arbitrarily, and the central cylinder fixing support member 150 may be made of, for example, a metal other than stainless steel or a resin material. The central cylinder fixing support member 150 may be made of a plurality of materials.

[0085] In addition, in the above embodiment, the case has been described in which the relative position adjustment portion 159 is configured by a long hole 157H formed in the vertical pipe connecting portion 157, but the relative position adjustment portion 159 may also be configured by a long hole formed on the support arm portion 154 side, or the relative position adjustment portion 159 may be configured by other well-known means.

[0086] In addition, in the above embodiment, the case where the liquid flowing into the vertical pipe 10 with a spiral guideway is sewage or the like has been described, but the liquid flowing into the vertical pipe 10 with a spiral guideway is not limited to sewage and can be set arbitrarily.

[0087] In addition, within the scope of the invention, it is possible to replace the components in the above-described embodiments with well-known components, and the above-described embodiments may be combined as appropriate. [Explanation of symbols]

[0088] O tube shaft 10 Vertical pipe with spiral guideway 100 Vertical pipe body 110 Center cylinder 120 Spiral Guideway 121 Upper Spiral Guideway 125 Lower Spiral Guideway 130 Hollow Space 140 Flat guide member 140' Flat guide member 150 Center cylinder fixing support member 159 Relative position adjustment unit

Claims

1. A vertical pipe body made of a straight pipe and arranged in the vertical direction; A central cylinder body arranged in the vertical pipe body in the vertical direction; a spiral guide path that is formed in a spiral shape around the central cylinder, and includes at least a pair of upper spiral guide paths disposed on the upper side of the central cylinder, and a lower spiral guide path disposed on the lower side of the upper spiral guide paths, and that spirally guides the liquid flowing down between the vertical pipe body and the central cylinder; At least one hollow space formed between the upper spiral guideway and the lower spiral guideway; a flat guide member disposed in the hollow space, connecting an inner peripheral surface of the vertical pipe body and an outer peripheral surface of the central cylinder body, and formed in a flat plate shape along a pipe axis of the vertical pipe body; Equipped with A distance L from a lower end of the upper spiral guideway to an upper end of the flat guide member in the tube axial direction is equal to or greater than one pitch of the upper spiral guideway. A vertical pipe with a spiral guideway.

2. When the inner diameter of the vertical pipe body is D, 2. The vertical pipe with a spiral guideway according to claim 1, wherein L is set to be greater than or equal to 0.8D.

3. A vertical pipe body made of a straight pipe and arranged in the vertical direction; A central cylinder body arranged in the vertical pipe body in the vertical direction; a spiral guide path that is formed in a spiral shape around the central cylinder, and includes at least a pair of upper spiral guide paths disposed on the upper side of the central cylinder, and a lower spiral guide path disposed on the lower side of the upper spiral guide paths, and that spirally guides the liquid flowing down between the vertical pipe body and the central cylinder; At least one hollow space formed between the upper spiral guideway and the lower spiral guideway; a flat guide member disposed in the hollow space, connecting an inner peripheral surface of the vertical pipe body and an outer peripheral surface of the central cylinder, the flat guide member being formed in a flat shape along a pipe axis of the vertical pipe body, and extending from a lower end of the upper spiral guide path along the pipe axis; A vertical pipe with a spiral guideway, comprising:

4. A vertical pipe with a spiral guideway according to any one of claims 1 to 3, The flat guide member is When viewed in a plan view, the upper spiral guideway is disposed at the same circumferential position around the tube axis as the lower end of the upper spiral guideway. A vertical pipe with a spiral guideway.

5. A vertical pipe with a spiral guideway according to any one of claims 1 to 4, A central cylinder fixing support member is provided for fixing the central cylinder to the vertical pipe body. A vertical pipe with a spiral guideway.

6. 6. The vertical pipe with a spiral guideway according to claim 5, The central cylinder fixing support member is A cylindrical portion that holds the central cylinder; A support arm portion that connects the cylindrical portion and the vertical pipe main body; having When viewed in plan view, The support arm portion is connected to the cylindrical portion at an upstream side of the liquid flowing down the spiral guide path and to the vertical pipe main body at a downstream side of the liquid flowing down, and extends along a tangential direction of the outer circumferential surface of the cylindrical portion. A vertical pipe with a spiral guideway.

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