JPH1181433A - Riverbed piping structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow sewage to flow down while effectively damping the energy of the sewage by connecting sewers arranged in both sides of a riverbed to sewers arranged across the bottom of the riverbed via pipes with spiral guide paths, respectively. SOLUTION: Sewers with spiral guide paths 3, 7 having spiral guide paths 32, 34, 72, 74 which allow sewer to flow down in such a state as bending inward are provided. Sewers 1, 5 arranged both sides of a riverbed K are connected to sewers 4, 8 arranged across the bottom of the riverbed K via the pipes with the spiral guide paths 3, 7, respectively. Then, the energy of the sewage flowing down the sewers 1, 5 arranged in the both sides of the riverbed K is effectively damped by the spiral guide paths 32, 34, 72, 74. Damage in the bottom walls of manholes 2, 6 caused by the falling impact of the sewage can be thus prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a riverbed piping structure for piping under a riverbed.

[0002]

2. Description of the Related Art Conventionally, as described in, for example, Japanese Utility Model Laid-Open Publication No. 4-53842, the upper end of a vertical pipe is connected to one end of an inflow pipe protruding into a manhole from a side wall of the manhole via a bent pipe. It is known that the lower end of the vertical pipe is installed at the bottom in the manhole, and the sewage flowing into the manhole by the inflow pipe is introduced into the bottom of the manhole by the vertical pipe.

[0003] However, when the vertical pipe provided in the manhole is long as described above, the bottom wall of the manhole may be damaged due to a large impact of sewage draining from the lower end of the vertical pipe. In addition, there is a disadvantage that the scattered scum adheres or stays on the side wall of the manhole and generates hydrogen sulfide, which causes deterioration of the concrete wall of the manhole.

[0004] Therefore, a sewage piping structure having a head crossing a river requires a sewage that has been once started up through a pump-up facility in front of the river and allowed to flow down the piping along a bridge over the river. The above-mentioned disadvantages are particularly problematic because it is necessary to adopt a piping structure in which the pipe is later dropped into the sewer pipe and discharged.

In addition, it is necessary to maintain the pump-up equipment so as not to cause a failure. At a high flow rate, the pump capacity and the piping become large, and the equipment becomes large.

[0006]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned conventional problems, and makes it possible to effectively use sewage flowing down a sewer pipe provided on both sides of a riverbed without increasing the size of facilities. The purpose of the present invention is to provide a riverbed piping structure capable of discharging water to a sewer while reducing the energy.

[0007]

SUMMARY OF THE INVENTION According to the present invention, a sewer pipe is piped across a riverbed, and the sewer pipes piped on both sides of the riverbed are each bent to the inner surface to drain the sewer. This is a riverbed piping structure connected via a pipe with a spiral guide path provided with a spiral guide path to be flowed down.

In the present invention, examples of the material forming the spiral guide path include metals and plastics. Examples of plastics include thermoplastic resins such as polyvinyl chloride, polyethylene, polypropylene, and methacrylic resins, and examples of thermosetting resins include unsaturated polyester resins, vinyl ester resins, and epoxy resins. And reinforced with organic fibers such as inorganic fibers, carbon fibers, aramid fibers, and vinylon fibers.

[0009] The height of the spiral guide path is one of the diameter of the vertical pipe.
/ 20 to 5/12 is preferred. The thickness of the spiral guideway varies depending on the diameter, but is usually 1/20 to 1 of the diameter.
About 5/100 is preferable. The starting point of the spiral guide path is preferably provided at a portion where the head from the inflow pipe is small (within a range of 0.3 to 2 times the inner diameter of the inflow pipe from the lower end of the inflow pipe). The spiral pitch of the spiral guide path is preferably about 1 to 10.

In the present invention, the material forming the vertical pipe includes the same material as the material forming the spiral guide path.

[0011]

According to the riverbed piping structure of the present invention, a sewage pipe is laid under the riverbed, and the sewage pipes piped on both sides of the riverbed are bent to the inner surface of the sewage pipe to drain the sewage. Since the spiral guideway is connected via the pipe with the spiral guideway provided, unlike a conventional sewage piping structure with a head work that crosses over a river, it does not become a large facility, and The sewage flowing down the sewage pipes provided on both sides of the riverbed can be discharged to the sewage pipes while effectively reducing the power.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an example of the riverbed piping structure of the present invention. Sewage pipe 1 on one side of Kawadoko K
The sewage pipe 1 is introduced into a first manhole 2 buried on one side of the riverbed K, and the inflow of the pipe 3 with the first spiral guideway installed in the first manhole 2 is performed. Tube 3
11 are connected.

The first pipe 3 with a spiral guide is a vertical pipe 31
, An air core tube 33, an upper spiral guideway 32, and a lower spiral guideway 34. The vertical pipe 31 has an inflow pipe 311 provided at the upper end from a substantially horizontal direction, and an outflow pipe 31 at the lower end.
2 are provided. An air core cylinder 33 having a hollow inside is provided upright at an upper portion of a substantially central portion inside the vertical pipe 31.

An upper spiral guide path 32 that bends and allows sewage to flow down is provided in the upper part of the vertical pipe 31. The outer peripheral edge of the upper spiral guide path 32 is adhered to the inner peripheral surface of the vertical pipe 31,
The inner peripheral surface is bonded to the outer peripheral surface of the air core cylinder 33.

A lower spiral guide path 34 that bends and allows sewage to flow down is provided in the lower part of the vertical pipe 31. The outer peripheral edge of the lower spiral guide path 34 is adhered to the inner peripheral surface of the vertical pipe 31, and no air core tube is provided.

No spiral guide path is provided between the upper spiral guide path 32 and the lower spiral guide path 34 in the vertical pipe 31. One end of a sewer pipe 4 is connected to the lower end of the first manhole 2, and the outlet pipe 31 of the first pipe 3 with a spiral guideway is provided.
The sewage discharged from the drain 2 is discharged to the drain 4. The sewage pipe 4 is provided so as to extend from one side of the riverbed K to cross the lower side of the riverbed K and reach the other side of the riverbed K.

A sewage pipe 5 is provided on the other side of the riverbed K. The sewage pipe 5 is introduced into a second manhole 6 buried on the other side of the side floor K, and is inserted into the second manhole 6. It is connected to the inflow pipe 731 of the installed pipe 7 with the second spiral guide path.

The pipe 7 with the second spiral guide path is a vertical pipe 71
, An air core tube 73, an upper spiral guideway 72, and a lower spiral guideway 74. The vertical pipe 71 has an inflow pipe 711 at the upper end from a substantially horizontal direction, and an outflow pipe 71 at the lower end.
2 are provided. An air core tube 73 having a hollow inside is provided upright at an upper portion of a substantially central portion inside the vertical tube 71.

An upper spiral guide path 72 that bends and allows sewage to flow down is provided in the upper part of the vertical pipe 71. The outer peripheral edge of the upper spiral guide path 72 is bonded to the inner peripheral surface of the vertical pipe 71,
The inner peripheral surface is bonded to the outer peripheral surface of the air core tube 73.

A lower spiral guide path 74 that bends and allows sewage to flow downward is provided in the lower portion of the vertical pipe 71. The outer peripheral edge of the lower spiral guide path 74 is adhered to the inner peripheral surface of the vertical pipe 71, and no air core tube is provided.

No spiral guide path is provided between the upper spiral guide path 72 and the lower spiral guide path 74 in the vertical pipe 71. The lower end of the second manhole 6 is connected to the other end of the sewage pipe 4 laid across the riverbed K and one end of a sewage pipe 8.

The second manhole 6 is provided with an invert 61 at the bottom, and the sewer pipe 4 is connected to the sewer pipe 8 by the invert 61 so that the sewage flowing down the sewer pipe 4 is passed through the invert 61. After that, it is discharged to the sewer pipe 8.

The second pipe 7 with a spiral guideway, which is installed in the first manhole 7, is placed on the invert 61, and discharges the sewage discharged from the outflow pipe 712 to the sewage pipe 8. It has become.

The mode of use of the riverbed piping structure shown in FIG. 1 will be described below with reference to FIG. The sewage A flowing down into the manhole 3 from the sewage pipe 1 arranged on one side of the riverbed K flows from the inflow pipe 311 into the vertical pipe 31 of the first helical guide pipe 3, and flows through the vertical pipe 31. After flowing down spirally along the upper spiral guide path 32, the section where the spiral guide path is not provided flows down while maintaining the spiral shape by inertia force, and again spirally along the lower spiral guide path 34. Flow down. In the meantime, the sewage is in an attenuated state.

The sewage that has reached the lower end of the vertical pipe 31
After leaving the manhole 3 from 12, the water is discharged to the sewer pipe 4, flows down the sewer pipe 4 traversed below the riverbed k to the other side of the riverbed k, and then discharged to the sewer pipe 8 via the invert 61. Is done.

On the other hand, the sewer pipe 5 laid on the other side of the riverbed K
The sewage B flowing down into the manhole 6 is supplied to the inflow pipe 711.
And flows into the vertical pipe 71 of the pipe 7 with the first spiral guide path,
After spirally flowing down the vertical pipe 71 along the upper spiral guide path 72, it flows down while maintaining the spiral shape by inertia in the section where the spiral guide path is not provided, and again the lower spiral guide path 7.
It flows down spirally along 4. In the meantime, the sewage is in an attenuated state.

The sewage that has reached the lower end of the vertical pipe 71 is discharged from the outflow pipe 7.
The manhole 6 leaves the manhole 6 and is discharged to the sewer pipe 8.

[0028]

The present invention will be described below with reference to examples. EXAMPLES As pipes 3 and 7 with spiral guide paths, fiber reinforced resin mortar, 20 mm thick, 300 mm inner diameter Upper part of vertical pipe 11 made of fiber reinforced resin, 12 mm thick, 300 mm outer diameter, 100 mm inner diameter Upper spiral guideway 32 is 3
Lower spiral guide paths 34, 74, which are arranged at a pitch and made of a fiber reinforced resin at the lower portion and have a thickness of 12 mm and an outer diameter of 300 mm.
Are arranged at 6 pitches, and the head from the inflow pipes 311 and 711 to the outflow pipes 312 and 712 has a head of about 16 m.

The sewage was discharged as described with reference to FIG. 2 under the conditions that the head from the ground surface to the bottom of the sewer pipes 4 and 8 was 25 m and the planned flow rate was 1.0 ton / sec. as a result,
The noise level indicating the magnitude of the impact in the first spiral guide pipe 3 and the second spiral guide pipe 7 is about 80 dB, and the noise level from the sewage discharged from the outflow pipes 312 and 712 ( Mist) was small.

COMPARATIVE EXAMPLE A vertical pipe having an inner diameter of 400 mm made of the same material as that of the embodiment without the spiral guide path was provided with a head of 6 m and a flow rate of 0.1.
The sewage was discharged under the condition of ton / second. At that time, the noise level near the outflow pipe was very large at 93 dB.
The area near the outflow pipe was filled with mist caused by the impact of sewage fall, and there were some places where the concrete in the manhole near the outlet of the outflow pipe was partially exfoliated.

[0031]

As described above, the riverbed piping structure of the present invention is constructed as described above, so that the sewage flowing down the sewer pipes provided on both sides of the riverbed can be effectively reduced without requiring large facilities. It can be discharged into the sewer while energizing.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of a riverbed piping structure of the present invention.

FIG. 2 is a cross-sectional view illustrating a use mode of the riverbed piping structure shown in FIG.

[Explanation of symbols]

 1, 4, 5, 8 Sewage pipe 2 First manhole 3 First pipe with spiral guideway 6 Second manhole 7 Pipe with second spiral guideway 31, 71 Vertical pipe 32, 72 Upper spiral guideway 33 , 73 Air core tube 34, 74 Lower spiral guideway 311, 711 Inflow pipe 312, 712 Outflow pipe

Claims (1)

[Claims] 1. A sewage pipe is laid across a riverbed, and a sewage pipe provided on both sides of the riverbed is provided with a spiral guideway which is bent to an inner surface and flows down the sewage. A riverbed piping structure characterized by being connected via a pipe with a spiral guideway.