JP3387737B2 - Pipe with spiral guideway - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used, for example, in a vertical flow-type vertical sewer pipe or the like, in which a spiral guide path for guiding a fluid in a spiral shape is provided in order to damp the flowing-down fluid. A pipe with a spiral guideway.

[0002]

2. Description of the Related Art In a place with a steep surface gradient, manholes are usually installed at appropriate intervals to form a step-type sewer channel in which a step is formed in a pipe line between the manholes. However, such a step-type sewer has a problem that the construction cost is high because the construction is not easy and the construction period is long.

For this reason, a method of using a vertical sewer pipe (drop shaft) in which the sewer pipes are arranged vertically has been developed in place of such a step type sewer pipe. Further, in Japanese Patent Laid-Open No. 8-41915, in order to attenuate the fluid flowing down in such a vertical sewer pipe,
A configuration is disclosed in which a spiral guide path for guiding a fluid in a spiral shape is provided inside.

In a pipe with a spiral guide path used for a vertical sewer pipe, a hollow tubular shaft tube portion is concentrically arranged at the axial center portion of a straight tubular pipe body portion. A spiral spiral guide path is provided between the pipe section and substantially the entire length. The outer peripheral surface and the inner peripheral surface of the spiral guide path are attached to the inner peripheral surface of the pipe main body portion and the outer peripheral surface of the shaft pipe portion, respectively.

In such a pipe with a spiral guide path, a fluid such as sewage flowing from the upper end portion thereof is in a damping state while flowing down along the spiral guide path. Therefore, the bottom portion of the manhole is not likely to be strongly impacted by the flowing fluid, and the wear of the bottom portion of the manhole is suppressed.

[0006]

However, in the spiral guide passage arranged in the pipe main body, the upper end is strongly impacted by the fluid flowing into the pipe main body, and the fluid flows at high speed even at the lower end. It receives a strong shock as it flows down. For this reason, after long-term use, the surface of the spiral guideway may be worn or damaged due to accumulated fatigue. In a tube with a spiral guide path, the spiral guide path and the straight pipe main body are usually integrally formed of a fiber reinforced resin. Therefore, if the spiral guide path is damaged, the entire tube with a spiral guide path must be replaced. It requires a long time for replacement work. Moreover, when replacing the tube with the spiral guideway,
The flow of sewage in the vertical sewer pipe must be stopped, and the replacement work takes a long time, which may have a great influence.

The present invention solves such a problem, and an object thereof is to easily replace the spiral guide path even if the spiral guide path is damaged due to an impact of a fluid flowing through the inside. It is an object of the present invention to provide a pipe with a spiral guide path that can finish the work in a short time.

[0008]

DISCLOSURE OF THE INVENTION A pipe with a spiral guide path according to the present invention comprises a straight tubular insertion tube main body, and a tubular shaft tube portion arranged so as to pass through the axial center portion thereof. intubation body portion and a spiral guide in with passage intubation and a spiral guide path provided in a spiral manner between the shaft tube portion, which is supported fitted to the outer tube of the straight tube which is perpendicular state, the With spiral guideway
The inner tube is attached to the inner surface of the lower end of the outer tube.
Is supported on a support plate, which supports the outer circumference of the outer tube.
Fixed in the outer tube with multiple bolts inserted from the surface
Around each bolt where the support plate is supported.
Is filled with silicon,
It is characterized by being installed .

[0009] Further, the pipe with the spiral guideway of the present invention is a straight pipe.
Insert the inserted inner tube body and its axial center
The tubular shaft portion disposed in the
Screw having a spiral guide path spirally provided between
Straight tubular outer casing with a vertical guideway
Of the insertion tube with the spiral guide path, which is fitted and supported in the tube.
The inner tube is not bolted to the outer tube.
Then, in the upper end of the outer tube, an annular seal member,
It is fitted so as to be pressed against the inner peripheral surface of the outer tube,
This seal member is pressed against the upper end surface of the interior pipe body.
This seal member allows the inside of the outer tube to
Between the peripheral surface and the outer peripheral surface at the upper end of the inner pipe body
However, it is characterized by being sealed in a watertight state.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG . 1 is a vertical sectional view showing an example of an embodiment of a tube with a spiral guide path according to the present invention. This tube with a spiral guide path has a straight tubular outer tube 10 and an insertion tube 20 with a spiral guide path that is mounted in the outer tube 10 concentrically.

The outer tube 10 is formed of, for example, a reinforced plastic composite tube and has an inner diameter of 500 mm.

As shown in FIG. 2, the inner tube 20 with a spiral guide path includes a straight tube-shaped inner tube body portion 21 fitted in the outer tube 10 and an axial center portion in the inner tube body portion 21. A hollow shaft tube portion 22 arranged so as to be inserted, and the shaft tube portion 22.
And a spiral guide path 23 provided in a spiral shape between the inner peripheral surface of the insertion tube main body 21 and.

The inner tube main body portion 21 has an outer diameter slightly smaller than the inner diameter of the outer tube 10 so as to be completely fitted inside the outer tube 10, and has a length smaller than the entire length of the outer tube 10. It has a slightly shorter axial length. Shaft tube part 2
2 has the same length as the main body 21 of the intubation tube. The outer peripheral surface of the spiral guide path 23 is integrally attached to the inner peripheral surface of the insertion tube main body portion 21 over its entire length,
The inner peripheral surface of the spiral guide path 23 is integrally attached to the outer peripheral surface of the shaft tube portion 22 over the entire length thereof.

The inner tube main body 21, the shaft tube 22, and the spiral guide path 23 are made of, for example, fiber reinforced plastic, and the outer diameter of the inner tube main body 21 is 490 mm.
Has an outer diameter of 200 mm and the pitch of the spiral guideway 23 is 250
It is integrally molded by the hand lay-up method so as to have a size of mm.

The insertion tube 20 inserted into the exterior tube 10 is
The lower end surface is supported by an annular support plate 11 attached to the inner peripheral surface of the outer tube 10. This support plate 1
1 is made of, for example, stainless steel, and has an outer diameter that comes into contact with the inner peripheral surface of the outer tube 10 and an inner diameter slightly smaller than the inner diameter of the insertion tube main body portion 21. The support plate 11 is fixed in the exterior pipe 10 by a plurality of bolts 12 inserted from the outer peripheral surface of the exterior pipe 10. The circumference of each bolt 12 on which the support plate 11 is supported is filled with silicon to be sealed in a water-tight state.

When manufacturing the pipe with the spiral guide path having the above-mentioned structure, the outer tube 10 and the insertion tube 20 with the spiral guide path are manufactured.
And are manufactured separately. Then, an annular support plate 11 is fitted into the lower end portion of the manufactured outer tube 10, and each support plate 11 is supported by a plurality of bolts 12, and silicon is injected around each bolt 12, respectively. To seal. When the outer tube 10 is in such a state, the inner tube 2 with a spiral guide path is provided in the outer tube 10.
0 is inserted, and the lower end portion of the insertion tube 20 with the spiral guide path is
It is in a state of being supported by a support plate 11 attached by each bolt 12. This gives a tube with a spiral guideway.

[0018] Such a spiral guide path with a tube, for example,
As a vertical pipe for sewerage, a plurality of pipes are vertically arranged in a manhole and are coaxially joined to each other.
The sewage entering the manhole flows into the upper end portion of the pipe with the spiral guide passage and sequentially flows down along the spiral guide passage 23 of each of the insertion pipes 20 with the spiral guide passage. Spiral guideway 23
The sewage flowing down along the sewage is in a state of being attenuated during the flowing down, so that the bottom of the manhole is not subject to a strong impact by the sewage.

The material of the outer tube 10 is not particularly limited, but it is preferable that the outer tube 10 has high strength, and it is formed of metal, synthetic resin, concrete or the like.

The insertion tube 20 with a spiral guide path is preferably formed of thermoplastic resin, thermosetting resin, or the like. As the thermoplastic resin, vinyl chloride resin, olefin resin (polyethylene, polypropylene, etc.), methacrylic resin, etc. are used. As the thermosetting resin, unsaturated polyester resin, vinyl ester resin, epoxy resin and the like are used, and further, these resins are used as fibers such as inorganic fiber, glass fiber, organic fiber, carbon fiber, aramid fiber and vinylon fiber. Those strengthened by can also be used. It can also be formed of metal.

If the through holes are provided in the peripheral surface of the shaft tube portion 22 which passes through the axial center portion of the inner insertion tube 20 so as to be positioned between the pitches of the spiral guide path 23, the spiral guide path is formed. Even if the sewage flowing down along 23 compresses the air between the pitches of the spiral guide path 23, the air is discharged into the shaft tube portion 22 from each through hole, so that along the spiral guide path 23, Sewage can be made to flow smoothly.

In the tube with the spiral guide path, only the inner insertion tube 20 with the spiral guide path is replaceable with respect to the outer tube 10. Further, the inner tube 20 with the spiral guide path is the outer tube. Since the pipe 10 only needs to be attached to and detached from, the replacement work is significantly facilitated. Therefore, even if the spiral guide path 23 is damaged, the time required for replacement is significantly shortened.

FIG . 3 is a longitudinal sectional view showing another embodiment of the pipe with the spiral guide path according to the present invention. In this embodiment, the outer tube 10 is formed of cast iron to have an outer diameter of 315 mm and an inner diameter of 300 mm, and the inner guide tube 20 with a spiral guide path inserted into the outer tube 10 is also formed of cast iron. The outer diameter of the portion 21 is 300 mm, the outer diameter of the shaft tube portion 22 is 100 mm, the pitch of the spiral guide path 23 is 150 mm,
The entire thickness is 4 mm.

The insertion tube 20 with the spiral guide path has a shaft tube portion 22.
And the spiral guide path 23 is integrally formed by cast iron,
Manufactured by inserting and welding the integrated shaft tube section 22 and spiral guide path 23 into the cast iron insertion tube body section 21 manufactured separately from the shaft tube section 22 and spiral guide path 23. To be done. The surfaces of the inner tube main body portion 21, the shaft tube portion 22 and the spiral guide path 23 are coated with an epoxy resin in order to prevent corrosion.

The insertion tube 20 with a spiral guide path inserted into the outer tube 10 is inserted through the outer tube 10 and the inner tube main body portion 21 is inserted.
Bolts 13 made of stainless steel screwed onto the peripheral surface of
Installed by. Each bolt 13 is located between the pitches of the spiral guide path 23 so as not to contact the spiral guide path 23. An annular seal member 14 made of butyl rubber is fitted in the upper end of the outer tube 10 so as to be pressed against the inner peripheral surface of the outer tube 10.
The seal member 14 is pressed against the upper end surface of the insertion tube main body 21. Therefore, with this seal member 14,
A watertight seal is provided between the inner peripheral surface of the outer tube 10 and the outer peripheral surface at the upper end of the inner tube main body 21.

In the tube with the spiral guide path, the tube with the spiral guide path should be replaced only when the spiral guide path 23 is damaged. By attaching and detaching each bolt 13, it is possible to easily attach and detach from the outer tube 10. Therefore, the working time required for replacing the insertion tube 20 with the spiral guide path is significantly shortened.

[0027]

As described above, the pipe with the spiral guide path according to the present invention is constructed by inserting the insertion tube with the spiral guide path into the outer tube in this manner, and therefore, even when the spiral guide path is damaged. It is possible to easily replace only the insertion tube with the spiral guide path. Therefore, the replacement work of the pipe with the spiral guide path is remarkably facilitated, and the working time for the replacement is remarkably shortened.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an example of an embodiment of a pipe with a spiral guideway according to the present invention.

FIG. 2 is a perspective view of the insertion tube with a spiral guide path used in the tube with the spiral guide path, with the insertion tube main body part removed.

FIG. 3 is a vertical cross-sectional view showing another example of the embodiment of the pipe with the spiral guideway according to the present invention.

[Explanation of symbols]

10 Exterior tube 11 Support plate 12 volt 13 volt 14 Seal member 15 Elastic body 20 Insertion tube with spiral guideway 21 Main body of intubation 22 Shaft tube 23 spiral guideway

─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-8-41914 (JP, A) JP-A-8-41915 (JP, A) Actual development 60-53882 (JP, U) Actual development Sho-59- 188579 (JP, U) Actual exploitation Sho 49-98145 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) E03F 5/02 F16L 37/00

Claims (2)

(57) [Claims] 1. A straight tube-shaped insertion tube main body, a tubular shaft tube section arranged so as to pass through the axial center section thereof, and a spiral shape between the insertion tube main body section and the shaft tube section. helical guideway with intubation and a provided helical guideway is supported fitted to the outer tube of the straight tube which is perpendicular state, the helical
Insert the guide tube with a guideway on the inner peripheral surface of the lower end of the outer tube.
Supported on a support plate attached to the support plate,
The outer pipe is formed by a plurality of bolts inserted from the outer peripheral surface of the pipe.
Of the bolts that are fixed in the
The surroundings are filled with silicon so that water is not
A pipe with a spiral guideway, which is characterized by being sealed at . 2. A straight tube-shaped insertion tube main body and its shaft
A tubular shaft tube part that is placed so as to pass through the core part
A spiral provided in a spiral shape between the tube body and the shaft tube.
The insertion tube with a spiral guideway that has
Is fitted and supported in the straight tube-shaped outer tube, the main body of the inner tube of the inner tube having the spiral guide path is bolted to the outer tube, and an annular shape is formed in the upper end of the outer tube.
So that the seal member of is pressed against the inner peripheral surface of the outer tube.
This seal member is fitted, and the seal member is
By being pressed against the upper end surface of the
On the inner surface of the outer tube and the upper end of the inner tube body.
The outer peripheral surface of the
Characteristic tube with spiral guideway.