JPH10168986A - Screw pipe for steep-slope section sewage pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the execution of works by bending and forming a sewage pipe in a spiral type. SOLUTION: The front end of an upper section is extended linearly on the tangent of the screw pipe, the inclination and spiral diameter of the whole screw pipe are determined, and the pipe is machined. A lower-section front end is elongated linearly on the tengent of the screw pipe, and the screw pipe 1 for steep-slope sewage is prepared. Flow velocity in the pipe is controlled by changing the number of the stage of the winding of a spiral or altering the diameter of the spiral when the inside diameter of the pipe is kept constant. Or sewage can be flowed down naturally from a vertical section to a steep slope section while holding required flow velocity because flow velocity can be adjusted by varying the axial angle of the whole spiral. Accordingly, a sewage pipeline on a precipice place or the steep slope section can be laid only by the spiral pipeline, the laying is executed easily, and construction cost is also reduced by a section, in which no manhole is needed in an intermediate section. Since a joining section by conventional stepped sections is removed and the flowing-down of sewage is brought to a continuous and uniform-flow state, solid bodies are flowed down simultaneously and smoothly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spiral drainage pipe for sewage in a steeply inclined section having a sewage pipe spiral.

[0002]

2. Description of the Related Art Conventionally, a sewage pipe having a steep slope portion is provided with a slope in a straight pipe so as to maintain an appropriate flow velocity under a sewage flow, and has a stair-like laying. In addition, the step portion has a limit of about 1.5 m in order to smoothly flow under the solid flow in the sewage.
For this reason, it was necessary to take measures such as laying pipes in small pieces, installing many manholes, or taking a gentle slope detour route avoiding steep slopes. Therefore, steep slopes have increased construction difficulties and construction costs.

[0003]

SUMMARY OF THE INVENTION Accordingly, the present invention has been invented in order to meet the demand for the sewage flowing down only by the pipes of the steep slope, which could not be constructed conventionally.

[0004]

Means for Solving the Problems Now, the structure will be described. (A) The upper end is straightly extended on the tangent line of the spiral tube. (B) Determine the inclination and spiral diameter of the entire spiral tube and process the tube. (C) Extend the lower tip straight on the tangent line of the spiral tube. The configuration is as described above.

[0005]

Next, the operation of the present invention will be described. In the case where the inner diameter of the pipe is kept constant for controlling the flow velocity in the pipe, (a) the number of spiral turns is changed. (B) changing the diameter of the helix. (C) Change the axis angle of the entire helix. Since the flow velocity can be adjusted by the above method, the sewage can flow naturally from the vertical to the steep slope part while maintaining the required flow velocity.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS If the shape of the spiral tube is circular, oval, horseshoe, or square, it can be designed according to the amount of sewage. Also, if the pipe material is changed to synthetic resin such as vinyl chloride, concrete, porcelain, steel, or cast iron, a sewer can be installed from a vertical to a steep slope without human holes according to the construction conditions.

[0007]

As described above, the sewage pipeline can be laid only on a cliff or a steep slope by using only a spiral pipeline.
Since there is no need for manholes in the middle, construction costs are also low.
In addition, since the conventional joint due to the step is eliminated and the sewage flows down continuously and uniformly, the solids simultaneously flow down smoothly.

[Brief description of the drawings]

FIG. 1 is a perspective view of a spiral tube of the present invention formed into a circular tube.

FIG. 2 is a cross-sectional view in which a spiral pipe of the present invention is formed into a circular pipe and used on a steep slope.

FIG. 3 is a cross-sectional view in which a spiral tube of the present invention is formed into a circular tube and used for a vertical cliff.

[Explanation of symbols]

 1. Is a spiral pipe for sewerage in steep slopes

Claims (1)

[Claims] 1. A spiral drainage pipe for sewerage in a steeply sloped section formed by spirally bending a sewerage pipe.