JP3535020B2 - Vertical pipe with spiral guideway - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical pipe having a spiral guideway which is suitable for use in a natural sewer type vertical sewer pipe. [0002] When flowing sewage into a manhole,
In order to attenuate the sewage flowing into the manhole, for example, as described in Japanese Utility Model Laid-Open No. 8-41915, a vertical sewage pipe (drop shaft) is provided in the manhole.
A method of placing has been implemented. For vertical sewer pipes,
A vertical pipe with a spiral guide path provided with a spiral guide path for guiding sewage to flow downward in a spiral state is used inside a vertically arranged straight tubular pipe body. In addition, an air core tube is provided at the shaft core of the spiral guide path in order to eliminate upwardly the air contained in the sewage guided by the spiral guide path. [0003] In such a vertical pipe with a spiral guide path, the sewage flowing into the upper end thereof is attenuated while flowing down along the spiral guide path. Therefore, there is no possibility that the bottom of the manhole is subjected to a strong impact due to the sewage flowing down, and wear of the bottom of the manhole is suppressed. [0004] However, depending on the amount of sewage water, the sewage deenergizing effect may not be sufficient only by flowing down the spiral guide path. An object of the present invention is to solve such a conventional problem and to provide a vertical pipe with a spiral guideway which has a large effect of reducing the sewage. SUMMARY OF THE INVENTION The present invention is directed to a vertical pipe having an internal spiral guide path in which a spiral guide path is provided in a straight vertical pipe main body, wherein the vertical pipe main body has an inner surface. This is a vertical tube with a spiral guide path in which a groove, a ridge or a step is provided along the axial direction in a section where the spiral guide path is provided. In the present invention, examples of the material forming the vertical pipe main body and the spiral guide path include metals and plastics. Examples of the plastic include thermoplastic resins, including polyvinyl chloride, polyethylene, polypropylene, and methacrylic resins.Thermosetting resins include unsaturated polyester resins, vinyl ester resins,
Examples of the resin include epoxy resins and reactive resins such as polyurethane and polydicyclopentadiene, and can be used as reinforced with inorganic fibers such as glass fibers, and organic fibers such as carbon fibers, aramid fibers, and vinylon fibers.
Further, a particle-reinforced plastic containing silica sand or the like can also be used. The spiral guide path does not need to be provided in the entire vertical pipe body in the axial direction. The height of the flow path of the spiral guide path is preferably about 1/20 to 5/12 of the diameter of the vertical pipe. The thickness of the spiral guide path varies depending on the diameter, but is usually preferably about 1/20 to 15/100 of the inner diameter of the vertical pipe. The spiral pitch of the spiral guide path is preferably about 1 to 10. The vertical pipe with a spiral guide path according to the present invention is provided with a groove, a ridge or a step along the axial direction in a section of the inner surface of the vertical pipe body where the spiral guide path is provided. By having
The sewage that has flowed in from the inflow pipe is further deenergized due to resistance when it collides with the concave groove, the ridge, or the step, so that the sewage that has been sufficiently attenuated can flow down from the outflow pipe. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing an example of a vertical pipe with a spiral guideway of the present invention, and FIG. 2 is a cross-sectional view along the line AA. As shown in FIG. 1 and FIG. 2, the vertical pipe 1 with a spiral guide path includes an upper vertical pipe 11, an intermediate vertical pipe 12, and a lower vertical pipe 13 connected in series. The upper vertical tube 11 has an air core tube 113 having a hollow inside standing upright at a substantially central portion in the upper vertical tube main body 111. An inflow pipe 14 is connected to an upper portion of the upper vertical pipe main body 11. A spiral guide path 112 is provided between an inner peripheral surface of the upper vertical pipe main body 111 below the bottom of the inflow pipe 14 and an outer peripheral surface of the air core cylinder 113. On the inner surface of the upper vertical pipe main body 11, in a section where the spiral guide path 112 is provided, one concave groove 114 is provided along the axial direction other than a portion intersecting with the spiral guide path 112. In the intermediate vertical pipe 12, no air core tube, spiral guide path and concave groove are provided. In the lower vertical pipe 13, the outflow pipe 15 is connected to a lower part of the lower vertical pipe main body 131. A spiral guideway 132 is provided in the lower vertical pipe main body 131 so that a spiral hole 132 is formed upward at the center by the top of the outflow pipe 15. Lower vertical pipe body 1
On the inner surface of 31, in the section where the spiral guide path 132 is provided, one concave groove 133 is provided along the axial direction other than the portion intersecting with the spiral guide path 132. In the vertical pipe 1 having the spiral guideway, an inflow pipe 1 is provided.
4, when the high-speed sewage M flows in, first, the upper vertical pipe 1
1, the high-speed sewage M flows down along the spiral guide path 112 as a spiral turning inflow and flows down.
The energy is reduced by the resistance at the time of colliding with the side wall 14. The sewage M that has passed through the upper vertical pipe 11 flows down in the intermediate vertical pipe 12 while maintaining a swirling inflow in a state of being somewhat deenergized. The sewage M that has passed through the intermediate vertical pipe 12 flows downward in the lower vertical pipe 13 as a spiral swirling inflow along the spiral guide path 132 and collides with the side wall of the concave groove 133. Is further reduced by the resistance. The sewage M sufficiently deenergized in this manner flows down from the outflow pipe 15. FIG. 3 is a sectional view showing another example of a vertical pipe with a spiral guideway according to the present invention. As shown in FIG. 3, in the case of the vertical pipe 2 with a spiral guide path, the concave groove 114 provided on the inner surface of the upper vertical pipe main body 11 described with reference to FIGS.
Instead, a ridge 214 is provided along the axial direction other than the portion intersecting the spiral guide path. Although not particularly shown, the lower vertical pipe main body 1 described with reference to FIGS.
Instead of the concave groove provided on the inner surface of No. 3, a ridge is provided along the axial direction other than the portion intersecting the spiral guide path. Other structures are the same as those shown in FIGS. Also in the vertical pipe 2 with the spiral guide path, the inflow pipe 14
When the high-speed sewage M flows in from above, the high-speed sewage M forms a spiral swirl inflow along the spiral guideway 212 and the like and flows down. Is done. FIG. 4 is an explanatory view showing still another example of a vertical pipe with a spiral guideway according to the present invention, wherein (a) is a schematic view thereof.
(B) is a plan view, and (c) is a perspective view showing only the ridge. As shown in FIG. 4, in the case of the vertical pipe 3 with the spiral guide path, the spiral guide path 332 is provided in the lower vertical pipe main body 331.
Is provided on the inner surface of the lower vertical pipe main body 331 for each section where the one-pitch spiral guide path 332 is provided. The cross-sectional area gradually decreases along the axial direction other than the portion intersecting with the spiral guide path. Protrusions 333 that become smaller are provided. Although not particularly shown, even within the section where the spiral guideway in the upper vertical pipe is provided, the inner surface of the upper vertical pipe in each section where the spiral guideway of one pitch is provided also intersects with the spiral guideway. In addition to the portion, a ridge having a gradually decreasing cross-sectional area as it goes downward along the axial direction is provided. Also in the vertical pipe 3 with the spiral guide path, when the high-speed sewage flows from the inflow pipe, the high-speed sewage flows as a spiral swirling inflow along the spiral guide path 332 and the like. Although the force is further reduced by the resistance when colliding with the side wall of the ridge 333, the spiral guide path 33 for one pitch
The upper part of each pair 2 is set to a damping state in which the damping force is increased or decreased so as to increase the damping force. FIG. 5 is a perspective view of a vertical pipe with a spiral guideway according to another embodiment of the present invention. In the case of this example, on the inner surface of the lower vertical pipe main body for each section where the one-pitch spiral guide path is provided, along the axial direction other than the portion intersecting with the spiral guide path, as it goes downward halfway. A ridge 433 is provided in which the cross-sectional area gradually decreases, and the cross-sectional area gradually increases from the middle to the bottom. In this case, the resistance is further reduced by the resistance when the sewage collides with the side wall of the ridge 433, but the damping force is particularly increased in the upper portion and the lower portion of each spiral guide path for one pitch. It is designed to be in an attenuated state as if it had great strength. FIG. 6 is a schematic view showing another example of a vertical pipe with a spiral guideway according to the present invention. In the case of this example, the lower vertical pipe main body 5 for each section provided with the spiral guide path of one pitch is provided.
The ridges 5 do not communicate with each other along the axial direction on the inner surface of the base 31 except for the portion that intersects the spiral guide path.
33, 534, and 535 are provided. In this case, the sewage is ridges 533, 534,
Although the power is further reduced by the resistance at the time of colliding with the side wall of the 535, the damping force can be adjusted comprehensively by shifting the colliding position every spiral guide path for one pitch. The present invention will be described below with reference to examples. Example 1 A vertical pipe 1 with a spiral guideway shown in FIGS. 1 and 2 was produced.
The vertical pipe main body 111 of the upper vertical pipe 11, the vertical pipe main body 131 of the intermediate vertical pipe 12 and the lower vertical pipe 13 has a thickness of 8.5 mm,
A transparent acrylic resin tube having an inner diameter of 252 mm was used. The section of the inner surface of the vertical pipe main body 111 of the upper vertical pipe 11 where the spiral guide path 112 is provided and the vertical pipe main body 131 of the lower vertical pipe 13
In the section of the inner surface where the spiral guide path 132 is provided, concave grooves 114 and 133 each having a depth and a width of 5 mm are provided, and the head from the bottom of the inflow pipe 14 to the bottom of the outflow pipe is about 7 m. The vertical tube 1 with a spiral guideway was manufactured. 5 liters / second of water is flowed into the vertical pipe 1 with a spiral guide from the inflow pipe 14 and the flow velocity when passing through the third and fourth stages of the spiral guide of the lower vertical pipe 13 is measured. did. The flow rate was measured by mixing a float having a length of about 50 mm in water and taking a video of the speed. as a result,
The flow rate was 1.98 m / sec. COMPARATIVE EXAMPLE The inner surface of the vertical pipe main body 111 of the upper vertical pipe 11 and the lower vertical pipe 13
The flow velocity was measured in the same manner as in Example except that no concave groove was provided on the inner surface of the vertical pipe main body 131. As a result, the flow velocity was 2.08 m / sec. Example 2 A vertical pipe 2 having a spiral guideway shown in FIG. 3 was manufactured. The height and width of the section where the spiral guide path 212 on the inner surface of the vertical pipe main body 211 of the upper vertical pipe 21 is provided and the section where the spiral guide path on the inner surface of the vertical pipe main body of the lower vertical pipe 21 is provided, respectively. The vertical pipe 2 with a spiral guideway was produced in the same manner as in Example 1 except that a ridge 214 of 5 mm was provided. The flow velocity of this vertical pipe 2 with a spiral guideway was measured in the same manner as in Example 1 and found to be 1.92 m / sec. As described above, the vertical pipe with a spiral guideway of the present invention has a great effect of reducing the sewage flowing down.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial longitudinal sectional view showing an example of a vertical pipe with a spiral guideway of the present invention. FIG. 2 is a cross-sectional view of the example shown in FIG. 1, taken along line AA. FIG. 3 is a cross-sectional view showing another example of a vertical pipe with a spiral guideway of the present invention. 4A and 4B are explanatory views showing another example of a vertical pipe with a spiral guideway according to the present invention, wherein FIG. 4A is a longitudinal sectional view, FIG. 4B is a transverse sectional view, and FIG. It is a perspective view which shows only a part. FIG. 5 is a perspective view showing only a protruding portion of still another example of the vertical pipe with a spiral guideway of the present invention. FIG. 6 is a schematic diagram illustrating still another example of a vertical pipe with a spiral guideway of the present invention. [Description of Signs] 1, 2, 3, 5 Vertical pipes 11, 21 with spiral guide path Upper vertical pipe 12, Middle vertical pipes 13, 33 Lower vertical pipes 111, 131, 211, 331 Vertical pipe main bodies 112, 212, 332 Spiral guideway

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-8-41915 (JP, A) JP-A-59-210115 (JP, A) JP-A-8-152081 (JP, A) 70633 (JP, U) Japanese Utility Model Showa 60-40537 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16L 9/18 F16L 11/12

Claims (1)

(57) [Claim 1] A vertical pipe with an internal spiral guide path provided with a spiral guide path in a straight tubular vertical pipe main body, wherein the spiral guide on the inner surface of the vertical pipe main body. A vertical pipe with a spiral guide path, characterized in that a groove, a ridge or a step is provided along the axial direction in a section where the path is provided.