JP2000146036A - Vertical pipe with spiral guide route - Google Patents

Abstract

PROBLEM TO BE SOLVED: To replace a spiral guide route very easily, with a good workability and in a short time, only by removing and inserting the spiral guide route provided to a shaft body together with the shaft body, to a vertical pipe main body, when the spiral guide route is damaged. SOLUTION: In this vertical pipe, a spiral guide route 23 is provided between the outer peripheral surface of a shaft body 22 provided to the axial core part of a vertical pipe main body 10, and the inner peripheral surface of the vertical pipe main body. In this case, the diameter of the spiral guide route is made smaller, toward the lower side. While a fitting part is provided to the support body 11 of the vertical pipe main body 10, an elastic body 12 is installed just at the upper side of the support body 11, that is, at the position where the outer peripheral edge of the spiral guide route 23 is abutted, and a guide body 20 furnished with the spiral guide route 23 with a rib is inserted to the vertical pipe main body 10, and the rib is fitted to the fitting part, as well as the elastic body 12 is pressure contacted to the inner peripheral surface of the vertical pipe main body 10, at the bending part.

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 sewage pipe of a free-flowing type, and internally provided with a helical guide path for guiding a fluid spirally in order to attenuate the force of the flowing fluid. Vertical pipe with a spiral guideway.

[0002]

2. Description of the Related Art In a place where the surface gradient is steep, manholes are usually provided at appropriate intervals, and a step type sewer having a step formed in a pipe between the manholes is formed. Construction of such a step type sewer is not easy,
There is a problem that the construction period is long and the construction cost increases.

For this reason, a method has been developed in which a vertical sewage pipe (drop shaft) in which sewage pipes are arranged vertically is used instead of the stepped sewage pipe. For example,
JP-A-8-41915 discloses that in such a vertical sewage pipe, in order to attenuate the force of a flowing fluid, a shaft pipe is arranged concentrically with a shaft core of a pipe main body. In addition, a configuration of a pipe with a spiral guide path is disclosed in which a spiral spiral guide path is attached to the pipe main body section and the shaft pipe section over substantially the entire length.

[0004] In this pipe with a spiral guide path, since the momentum of the fluid such as sewage flowing from the upper end thereof is attenuated while flowing down the spiral guide path, the bottom of the manhole or the like is affected by the flowing fluid. There is no danger of receiving a strong impact, and damage to the bottom of the manhole is suppressed.

[0005] However, the spiral guide path arranged in the pipe main body receives a strong impact at the upper end first due to the fluid flowing into the pipe main body, and the fluid also flows at a high speed even at the lower end of the spiral guide path. Receives a strong shock to flow down. For this reason, when used for a long period of time, the spiral guideway may be worn on its surface or may be damaged by accumulation of fatigue.

On the other hand, in a pipe with a spiral guide path, the spiral guide path and the straight pipe main body are usually formed integrally with a fiber reinforced resin. The entire pipe has to be replaced, and this replacement work becomes large and difficult. Moreover, when replacing a pipe with a spiral guideway, it is necessary to stop the flow of sewage in the vertical sewage pipe, and if the replacement takes a long time, there is a possibility that the surrounding area may be greatly affected. .

[0007]

In order to solve such a problem, the present inventors first contacted the outer peripheral edge of the spiral guideway with the inner peripheral surface of the pipe main body by pressing the spiral guideway. By installing an elastic body that supports the inside of the pipe main body, if the spiral guide path is damaged, it is possible to extract and replace only the spiral guide path, and thus the replacement work accompanying the damage of the spiral guide path can be shortened. (See Japanese Patent Application Laid-Open No. 10-73185).

However, the present inventors have further studied the pipe with a spiral guideway described in this publication,
Since the elastic body is attached to the outer peripheral edge of the spiral guide path, the surface pressure of the elastic body is applied to the spiral guide path from the start to the end of the spiral guide path, especially when the pipe is long,
Extraction of the spiral guideway from the pipe main body and insertion into the pipe main body are not easy unexpectedly, and furthermore, fixing work to the inner peripheral surface of the pipe main body after inserting the spiral guideway into the pipe main body. In some cases, it is difficult to fix the pipe from the outer peripheral surface of the pipe body (it is impossible to bury the pipe with the spiral guideway directly).

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to provide a shaft guide when a spiral guideway is damaged due to an impact of a fluid flowing down the inside. The length of the spiral guide path that can be inserted into and removed from the vertical pipe body together with the shaft body, making it possible to replace the spiral guide path very easily. Therefore, the spiral guide path replacement work can be completed in a short time with good workability and safely. It is to provide a vertical pipe with a road.

[0010]

In order to achieve the above object, according to the present invention, an outer peripheral surface of a shaft provided on a shaft core of a vertical tube main body and an inner peripheral surface of the vertical tube main body are provided. A spiral guideway provided with a spiral guideway between the surface and the spiral guideway, wherein the diameter of the spiral guideway is reduced as it goes down. Provide a vertical tube.

According to a second aspect of the present invention, a support for supporting a plurality of lower end portions of the spiral guide path extends from the inner peripheral surface of the vertical pipe main body, and extends downward from the vertical pipe main body. 2. The vertical pipe with a spiral guideway according to claim 1, wherein the overhang width of the support is widened corresponding to the diameter of the spiral guideway. 3. The present invention according to claim 3 is characterized in that an elastic body is attached to a portion of the inner peripheral surface of the vertical pipe main body to which the outer peripheral edge of the spiral guide path is to be brought into contact. 2. A vertical pipe with a spiral guideway according to item 2.

(Operation) A pipe with a spiral guide path according to the present invention is a spiral spiral guide between an outer peripheral surface of a shaft body disposed on a shaft core of a vertical pipe main body and an inner peripheral surface of the vertical pipe main body. There is a road,
Since the diameter of the spiral guide path is reduced as it goes down, in the case of breakage of the spiral guide path due to the impact of the fluid flowing down the inside, the spiral guide path is pulled out together with the shaft from the inside of the vertical pipe main body, and new By inserting a spiral guideway, the spiral guideway can be easily replaced in a short time.

According to the second aspect of the present invention, a support for supporting a plurality of lower ends of the spiral guideway extends from the inner peripheral surface of the vertical pipe main body, and extends downward from the vertical pipe main body. Since the overhang width of the support is widened in accordance with the diameter of the spiral guide path, the spiral guide path together with the shaft can be easily and easily replaced with a length that can be inserted into and removed from the pipe main body. The guideway replacement work can be completed safely and in a short time with good workability. Claim 3
According to the present invention, an elastic body is attached to a portion of the inner peripheral surface of the vertical pipe main body where the outer peripheral edge of the spiral guide path is to be brought into contact with the spiral guide path. Since the pipe is a vertical pipe, the work of replacing the spiral guide path can be completed in a short time with good workability, and the mounting of the vertical pipe main body on the inner peripheral surface becomes more reliable.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic partial longitudinal sectional view showing an example of an embodiment of a vertical pipe with a spiral guideway of the present invention. The vertical pipe with a spiral guide path has a vertical pipe main body 10 and a guide body 20 mounted in the vertical pipe main body 10. The material of the vertical pipe body 10 is not particularly limited, but is preferably high in strength, and is formed of a metal, synthetic resin, concrete, fiber reinforced resin mortar composite pipe, or the like.

The guide 20 has a shaft 22 disposed so as to pass through the shaft core of the vertical pipe main body 10, and a spiral shape between the outer peripheral surface of the shaft 22 and the inner peripheral surface of the vertical pipe main body 10. And a spiral guideway 23 provided at the center of the vehicle. Shaft 22 as shown
Is formed of a shaft tube having a circular cross section, but may be a cylindrical body having a polygonal cross section in some cases. Hereinafter, for convenience, the reference numeral 22 is also used for a shaft tube as a shaft body.

The shaft pipe 22 generally has a length substantially the same as the length of the vertical pipe main body 10.
Is integrally attached to the outer peripheral surface of the spiral guide path over its entire length, but the diameter of the spiral guide path 23 is gradually reduced toward the lower side as shown in the figure.

Reference numeral 11 denotes a support for projecting from the inner peripheral surface of the vertical pipe main body 10 and supporting a plurality of lower ends of the spiral guide path 23. Each support 11 is provided on the inner peripheral surface of the vertical pipe main body 10.
The spiral guide path 23 is arranged at equal intervals along the spiral direction of the spiral guide path 23.
It is gradually widened to t2... t6, and has a size capable of supporting the spiral guide path 23 provided in the shaft tube 22. In other words, for example, one third to one quarter of the ring
The inner diameter of the section-shaped support 11 becomes smaller in accordance with the diameter of the spiral guide path 23 as it goes below the vertical pipe main body.

Further, the size relationship between the spiral guide path 23 and the support 11 provided at a portion located above the spiral guide path 23 is such that the spiral guide path 23 can be pulled out of the vertical pipe main body 10 without hindrance. The inner diameter of the support 11 is slightly larger than the maximum diameter, that is, the outer diameter of the bent portion 231, that is, the overhang width is slightly narrower. Each support 11 is provided with the vertical pipe main body 1.
0 by a bolt (not shown) inserted from the outer peripheral surface
It is fixedly attached to the vertical pipe main body 10.
The periphery of each bolt supporting each support 11 is sealed in a watertight state by being filled with silicon.

In order to obtain a vertical pipe with a spiral guide path having such a configuration, when the guides 20 are inserted into the vertical pipe main bodies 10 manufactured separately, the spiral guides 23 have a diameter as they go downward. Is smaller, and the magnitude relationship with the support 11 provided at a portion located above the same is set as described above, so that the lower part of the lowermost spiral guide is blocked by the support in the middle. The lower and upper helical guides of the upper and middle stages are abutted and supported by the corresponding helical guides 11 respectively, and the lower helical guides of the lower and upper tiers are inserted into the helical guides of the lower tier. It becomes a vertical pipe with a road.

However, since the guide 20 is supported only by the length that is placed on the support 11, sewage or the like flows into the upper end of the vertical pipe with the spiral guide path, and the guide 20 is supported.
Although the momentum is attenuated when spirally flowing down along the spiral guide path 23, the entire guide body 20 may rotate in the downstream direction in some cases. Therefore, as shown in FIG. A rib 232 projecting below the bent portion 231 is provided on the lower surface of the spiral guide body 23 in the downward arrow direction.
It is preferable that the support body 11 be provided with a fitting portion 111 (see FIGS. 2 and 3) into which the rib 232 is fitted when the is inserted.

Instead of providing the rib 232 and the fitting portion 111, an elastic body may be attached to the inner peripheral surface of the vertical pipe main body at a position where the outer peripheral edge of the spiral guide path 23 is to be brought into contact. Alternatively, the spiral guide path 23 can be more reliably
In order to attach the elastic member, a rib 232 or the like may be provided and an elastic body may be attached. Further, the shape of the support 11 is not particularly limited. For example, when the support on the left side of the vertical pipe main body in FIG. 1 is observed, the cross section may be formed of an L-shaped small piece.

FIG. 4 shows a state in which the above-mentioned fitting portion (not shown) is provided on the support of the vertical pipe main body 10 in FIG. 1 and the upper edge of the support, that is, the outer peripheral edge of the spiral guide path 23 abuts. An elastic body 12 is attached to the inner peripheral surface of the vertical pipe main body 10 at a portion to be formed, and a guide body 20 having a spiral guide path 23 with a rib (not shown) is inserted into the vertical pipe main body 10. FIG. 7 is a schematic partial longitudinal sectional view of a vertical pipe with a spiral guide path in a state where the elastic body 12 is pressed against the inner peripheral surface of the vertical pipe main body 10 at the bent part 231 and at the same time the rib is fitted to the fitting part. .

The elastic body 12 adhered to the inner peripheral surface of the vertical pipe main body 10 by, for example, an adhesive is made of synthetic rubber such as styrene-butadiene rubber or, in some cases, natural rubber. The thickness of the elastic body 12 is
Of the vertical pipe main body 10, the thickness from the inner peripheral surface of the vertical pipe main body 10 to slightly before the tip of each support body 11, that is, the inner circumference of the vertical pipe main body. The thickness is slightly wider than the distance from the surface to the outer peripheral surface of the spiral guide path,
When the whole is inserted, the elastic body 12 compressed in the radial direction of the vertical pipe main body by about 1 mm, for example, and pressed into contact with the inner peripheral surface of the vertical pipe main body 10 causes the spiral guide path 23 and the shaft pipe 22 to be pressed by the elastic force. Is set so as to be reliably supported in the vertical pipe main body 10.

The elastic body 12 only needs to have an elastic force capable of supporting the entire guide body 20 in the vertical pipe main body 10 by being pressed against the inner peripheral surface of the vertical pipe main body 10. Although it depends on the inner diameter of the vertical pipe main body 10, it is generally about 0.5 to 15% of the inner diameter of the vertical pipe main body 10.

Normally, the guide body 20 has substantially the same length as the vertical pipe main body 10, and the point where the spiral guide path 23 is attached over the entire length of the shaft pipe 22 is as described above. Is the length of the shaft tube 22 and thus the length of the vertical tube body 10;
It depends on the flow rate of inflow sewage, etc.
It is about eight.

When the vertical pipe main body 10 is somewhat long, for example, when the bottom of the manhole reaches several tens of meters from the ground surface in deep underground use, the guide body 20 is similar to the vertical pipe main body 10. Instead of the length, the length may be located only at the upper and lower portions of the vertical pipe main body, or in some cases only at the lower portion. When the vertical pipe main body 10 is long, even if the guide body 20 is stored only in the lower portion of the vertical pipe main body, the thickness of the guide body 20 is gradually increased toward the outer peripheral edge of the spiral guide path 23 as it goes downward. When the elastic body 12 is attached, the elastic body 12 comes into contact or is in a state of being easily contacted over a long distance from the upper end to the lower end of the inner peripheral surface of the vertical pipe main body when the guide is inserted.
Workability of construction becomes very poor.

Therefore, in such a case, if the elastic body 12 is previously attached to the lower part of the inner peripheral surface of the vertical pipe main body by, for example, an adhesive, the inner peripheral surface of the vertical pipe main body is inserted when the guide is inserted. Since no elastic body is attached to the upper side, a sufficient clearance is maintained between the outer peripheral edge of the spiral guideway 23 and the inner peripheral surface of the vertical pipe main body, and the workability of construction is good.

When a water-expandable elastic body is used as the elastic body, when the guide body is inserted into the vertical pipe main body, the water-expandable elastic body is kept in a low volume state, and the spiral of the guide body is kept. Since the outer diameter of the guide path can be made sufficiently smaller than the inner diameter of the vertical pipe main body at the portion where the elastic body is bonded, the insertion work is further facilitated. Thereafter, when it comes into contact with water, it is set so that it swells with water and is pressed against the inner peripheral surface of the vertical pipe main body 10 by elastic force.

For such a water-swellable elastic body, a rubber or resin of a type which swells with water is used. For example, a commercially available water-swellable rubber [trade name "Aqualeala 3V" manufactured by OHJ Sangyo Co., Ltd .; synthetic rubber] (Chloroprene rubber and styrene-
Consisting of a mixture of a butadiene copolymer) and a superabsorbent resin].

As the water-swellable elastic body 41, one having a volume expansion coefficient of 1.5 to 10 times that of the low volume state is preferably used, and one having a volume expansion coefficient of 2 to 5 times is more preferably used. . If the volume expansion coefficient is too small, it is necessary to narrow the interval between the inner peripheral surface of the vertical pipe main body 10 and the outer peripheral surface of the spiral guide path 23, and if it is too large, it tends to protrude laterally or deteriorate physical properties. .

The shaft pipe 22, the spiral guide path 23, the rib 232 of the guide body 20, and the support body 11 of the vertical pipe main body 10 are usually made of a material having high strength such as hard synthetic resin, fiber reinforced resin, and metal. However, a fiber reinforced resin is preferably used in consideration of the total including the weight and the corrosiveness. Among the hard synthetic resins, examples of the thermoplastic resin include a vinyl chloride resin, an olefin resin (eg, polyethylene and polypropylene), and methacrylic resin. Examples of the thermosetting resin include an unsaturated polyester resin, a vinyl ester resin, and the like. Epoxy resins and the like can be mentioned. Examples of the fiber-reinforced resin include those obtained by reinforcing these resins with fibers such as inorganic fibers, glass fibers, organic fibers, carbon fibers, aramid fibers, and vinylon fibers. Examples of the metal include aluminum and a stainless alloy.

If a through hole is provided on the peripheral surface of the shaft 22 of the guide body 20 so as to be located between the pitches of the spiral guide path 23, the sewage flowing down along the spiral guide path 23 is provided. Even if the air between the pitches of the spiral guideway 23 is compressed, the air is discharged from each through hole into the shaft pipe 22 as a shaft, so that the sewage is smoothly drained along the spiral guideway 23. Can flow down.

(Embodiment 1) Referring to FIG.
2 is provided on the support body, and the elastic body 12 is bonded in advance to the inner peripheral surface of the vertical pipe main body 10 at the portion where the outer peripheral edge of the spiral guide path 23 is to be contacted. The guide body 20 having the spiral guide path 23 formed with the rib 232 is inserted into the vertical pipe main body 10, and the elastic body 12 is pressed against the inner peripheral surface of the vertical pipe main body 10 at the bent portion 231, and Was fitted to the fitting portion to obtain a vertical pipe with a spiral guide path as shown in FIG.

The inflow pipe 3 shown in FIG. 6 connected to the vertical pipe main body 10 and the upper side thereof is a fiber-reinforced resin mortar composite pipe, both of which have an inner diameter of 1,000 mm. The support 11 was integrally formed at a predetermined position on the inner peripheral surface of the vertical pipe main body 10 by a hand lay-up method using a fiber reinforced resin. The guide body 20 has a length of 2.5 m and an outer diameter of 32.
A spiral guideway 23 was integrally formed on a 5-mm shaft tube 22 by a hand lay-up method using a fiber-reinforced resin. The spiral guide path 23 had a pitch of 820 mm, a maximum outer diameter of the first pitch was 990 mm, a maximum outer diameter of the second pitch was 980 mm, and a maximum outer diameter of the third pitch was 970 mm.

The elastic body 12 is formed of a continuous body made of styrene-butadiene rubber having a trapezoidal cross section, and as shown in FIG. 5, is formed by notches into which ribs 232 can be fitted at three places per pitch of the spiral guide path. A fitting portion is provided, and the thickness is made thicker down to the lower portion of the vertical pipe main body 10 according to the diameter of the spiral guide path 23, and when the guide body 20 is inserted and pressed by the bent portion 231, the first
6 mm thick at the pitch, 11 m thick at the second pitch
m, the third pitch portion was set to have a thickness of 16 mm.

The vertical pipe main body 10 having a length of 5 m is provided with the guide 2
0 is carried in by a crane, and the bent portion 231 of the spiral guideway 23 is
The lower portion of the elastic body 12 is placed on the support body 11 while pressing the elastic body 12, and the rib 232 formed in the spiral guide path 23 is fitted to the fitting portion 111 so that the guide body 20 is fixed. Completed. Further, by holding the upper end of the shaft pipe 22 and lifting it upward, the spiral guide path 23 was easily separated from the support 11 and the guide 20 could be pulled out from the vertical pipe main body 10. The drawing length was 2.5 m.

Next, sewage is caused to flow into the inlet pipe 3 connected to the pipe with the spiral guide path, and from the upper end of the pipe with the spiral guide path, spirally along the spiral guide path 23 of the guide 20. When the sewage was allowed to flow down, it was confirmed that the sewage was in a state of attenuated during the spiral flow. Therefore, there is no possibility that a strong impact is applied to the bottom of the manhole by the sewage flowing down.

(Example 2) A tube with a spiral guideway having the same configuration as in Example 1 was obtained except that the following points were changed in Example 1. The length of the vertical pipe main body 10 was 12.4 m, the inner diameter was 700 mm, and the inner diameter of the inlet pipe 3 was 600 mm. The guide body 20 is a shaft pipe 22 having a length of 2.0 m and an outer diameter of 221 mm.
6 is provided with a spiral guide path 23 of 6 pitches, the lower end of which is shown in FIG.
Is disposed on the support 11 of the vertical pipe main body 10 so as to be located substantially at the upper end of the outlet pipe 4. The drawing length was 12 m. The maximum outer diameter of the first pitch of the spiral guide path 23 is 59
The maximum outer diameter of 5 mm and the sixth pitch was 570 mm.

As the elastic body, a water-swellable rubber (OHJI
Aqueous sealer 3V (trade name, manufactured by Sangyo Co., Ltd.), which is set to have a thickness of 7 mm at the first pitch of the spiral guideway 23 when the water expands (free state). What was done was used.

It was easy to insert and remove the guide 20 from the vertical pipe main body 10. In particular, when inserting, since the water-swellable elastic body did not expand, the outer peripheral edge of the spiral guide path 23 did not come into contact at all. In the case of pulling out,
There was some resistance because the elastic body was expanded, but because of the elastic body, there was no problem in lifting the guide body 20.
After the portion where the elastic body was adhered, the lifting could be completed without any problem.

[0041]

The pipe with a spiral guideway according to the present invention is constructed as described above, and the diameter of the spiral guideway is reduced as it goes down. Pull out the spiral guide path together with the shaft from inside the vertical pipe body,
By inserting a new spiral guideway, the spiral guideway can be easily replaced in a short time.

According to the second aspect of the present invention, the support is extended from the inner peripheral surface of the vertical pipe main body, and the extending width of the support is reduced toward the lower part of the vertical pipe main body. The spiral guideway, together with the shaft body, can be replaced very easily with the length that can be inserted and removed from the pipe body, so that the replacement work of the spiral guideway can be performed easily and safely. It can be completed in a short time. According to a third aspect of the present invention, a portion of the inner peripheral surface of the vertical pipe main body to which the outer peripheral edge of the spiral guide path is to be contacted,
Since the elastic body is attached, the replacement work of the spiral guide path can be completed in a very short time with good workability, and the attachment of the vertical pipe main body to the inner peripheral surface is more reliable.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional perspective view of a main part for explaining an inserted state of a spiral guide path in another embodiment of the vertical pipe with a spiral guide path of the present invention.

FIG. 3 is a schematic plan view of a vertical pipe main body to which a support is attached in FIG. 2;

FIG. 4 is a schematic vertical sectional view of the vertical pipe with a spiral guide path according to the first embodiment of the present invention, in which only a part of the vertical pipe is appropriately cross-sectioned.

FIG. 5 is a schematic plan view of the vertical pipe main body.

FIG. 6 is an explanatory diagram showing a positional relationship between a vertical pipe with a spiral guideway of the present invention and a connected inlet pipe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Vertical pipe main body 11 Support body 111 Fitting part 12 Elastic body 20 Guide body 22 Shaft body 23 Spiral guideway 231 Bending part 232 Rib

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2D063 BA01 BA20 3H111 AA01 CA57 CB14 CB22 DA26 DB05

Claims (3)

[Claims] 1. A vertical pipe with a spiral guide path, wherein a spiral spiral guide path is provided between an outer peripheral surface of a shaft body disposed on a shaft core portion of the vertical pipe main body and an inner peripheral surface of the vertical pipe main body. A vertical pipe with a spiral guide path, wherein the diameter of the spiral guide path is reduced as it goes down. 2. A support for supporting a plurality of lower end portions of the spiral guide path extends from an inner peripheral surface of the vertical pipe main body, and the extending width of the support increases toward the lower part of the vertical pipe main body. The vertical pipe with a spiral guideway according to claim 1, wherein the vertical pipe is widened according to the diameter of the spiral guideway. 3. The spiral according to claim 2, wherein an elastic body is attached to a portion of the inner peripheral surface of the vertical pipe main body which is to be brought into contact with an outer peripheral edge of the spiral guide path. Vertical pipe with guideway.