JPH09264463A - Tube with spiral guide - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase strength and rigidity to avoid an early breakage by repeated impacts of flowing water by applying the constitution that a spiral guide passage has a core material clamped between a pair of resin layers. SOLUTION: A spiral guide passage 12 is formed to have a core material of expanded vinyl chloride resin clamped between a pair of polyvinyl chloride resin layers over entire length. The spiral guide passage 12 is inserted in a tube body 11 made of glass fiber reinforced unsaturated polyester resin. Then, the tube body 11 and the spiral guide passage 12 are heated and hardened, thereby forming a spiral guide passage fitted tube 10. This spiral guide passage fitted tube 10 is kept vertical and water is made to flow therein by a flowrate of 50 liters per second. As a result, the displacement of the spiral guide passage 12 at an inner side edge is found as 6mm or less. Also, no separation takes place between the external side of the spiral guide passage 12 and the internal side of the tube body 11 and the strain of the bonded part thereof is equal to or less than 0.5%. Thus. the spiral guide passage 12 is formed to have sufficient strength.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spiral used for a vertical flow-type vertical sewer pipe or the like, in which a spiral guide passage having a hollow center is attached inside a straight pipe main body. Regarding pipes with guideways.

[0002]

2. Description of the Related Art In a place where the surface gradient is steep, manholes are usually installed at appropriate intervals to form a step-type sewer for forming a step in the pipe 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, recently, in such a vertical sewer pipe, in order to reduce the fall energy and prevent the mixture of gas, a pipe with a spiral guide passage is used in the upper inflow part, and also in the lower outflow part. Vertical sewer lines using pipes with spiral guideways have been proposed.

An example of such a vertical sewer line is shown in FIG. In this vertical sewer pipe, a pipe 51 with a spiral guide passage arranged in an upper part is arranged vertically, and a pipe 53 with a spiral guide passage is arranged vertically in a lower part.
A plurality of sub-pipes 52 each having a smooth inner peripheral surface are vertically arranged between the upper pipe 51 with the spiral guide passage and the lower pipe 53 with the spiral guide passage.

In the upper tube 51 with a spiral guide path, a hollow support shaft 51b is inserted through the axial center of the pipe body 51a, and between the support shaft 51b and the inner peripheral surface of the pipe body 51a. A spiral guide path 51c is provided in the. Tube body 51
At the upper end of a, sewage flowing in the horizontal direction flows into the inside, and the sewage flows into the spiral guideway 5
It is designed to flow down in a spiral shape guided by 1c.
The sewage flowing down along the spiral guide path 51c becomes a vortex flow, the excess energy is absorbed, and the gas-liquid separation is performed. Then, the sewage flowing down the pipe with a spiral guide path 51 passes through the sub pipe 52 and flows into the lower pipe with a spiral guide path 53.

A pipe 53 with a spiral guide path provided in the lower part
Is provided with a spiral guide path 53b having a hollow axial center portion on the inner peripheral surface of the pipe body 53a. The sewage that has flowed into the lower pipe 53 with the spiral guide passage through the auxiliary pipe 52 becomes a vortex while flowing down along the spiral guide passage 53b, absorbs excess energy, and enters the cavity of the spiral guide passage 53b. The shaft center portion thus separated prevents gas from being mixed with the sewage flowing down due to gas-liquid separation.

A pipe 5 with a spiral guide path having a hollow center.
3 is, for example, a glass fiber reinforced resin in which a spiral guide path 53b made of a fiber reinforced resin such as a glass fiber reinforced resin having excellent strength or a thermoplastic polyvinyl chloride resin (PVC) is formed into a straight tube shape. Tube body 5 made of fiber-reinforced resin or polyvinyl chloride resin
A method of manufacturing by inserting the outer peripheral surface of the spiral guide passage 53b and the inner peripheral surface of the tube main body portion 53a by inserting into the 3a has been developed.

When manufacturing the spiral guide path 53b and the tube main body 53a made of fiber reinforced resin, a hand lay-up method is usually employed in which resin-impregnated fibers are sequentially laminated on the inner mold. . When the spiral guide path 53b is manufactured from polyvinyl chloride resin, the polyvinyl chloride resin is usually formed into a plate shape and then shaped into a predetermined spiral shape.

[0009]

When the pipe main body 53a and the spiral guide path 53b are made of fiber reinforced resin or polyvinyl chloride resin, respectively, the pipe main body 5 is
When the diameter of 3a is small, there is no particular problem, but when the diameter of the pipe body 53a is 2 m or more, the amount of flowing water in the pipe body 53a increases, and the spiral guide passage 53b is prevented from being damaged by water pressure. It is necessary to increase the wall thickness.
However, in order to increase the wall thickness of the spiral guide path 53b made of fiber reinforced resin, a large number of resin-impregnated fibers must be laminated in the inner mold, which requires a lot of time. In addition, since a large amount of fiber reinforced resin is required, the spiral guide path 53b to be manufactured becomes heavy and the economy is impaired.

Similarly, a spiral guideway 5 made of polyvinyl chloride.
When the wall thickness of 3b is increased, a large force is required to shape the plate-shaped vinyl chloride resin into a predetermined spiral shape. Therefore, in order to form the predetermined spiral shape. It takes a long time and a large amount of material is required, so that the weight is increased and the economical efficiency is deteriorated.

Further, the spiral guide path 53b has a thickness of 5 mm.
If it becomes the above, a crack will become easy to generate inside resin. The cracks generated inside the resin are
It also occurs due to the change over time in b. In particular, when the fiber reinforced resin layer is laminated by the hand layup method, cracks are likely to occur between the layers. When a crack is generated inside the resin, the spiral guide passage 53b does not exhibit predetermined design strength and rigidity, and the pipe with spiral guide passage 50 does not exhibit predetermined pressure resistance and durability. Moreover, the spiral guideway 53
Since the impact of the flowing water is repeatedly applied to b, the fatigue load is repeatedly applied due to the impact, and the crack propagates and spreads in a short time from the void (void) existing in the spiral guide path 53b. As a result, the spiral guide path 53b may be damaged early.

The present invention solves such a problem, and its purpose is to facilitate manufacture and, in addition, because of its excellent strength and rigidity, it can be damaged early even if repeated impacts of running water are applied. (EN) Provided is a tube with a spiral guide path having a spiral guide path that does not cause

[0013]

In a pipe with a spiral guide path according to the present invention, a resin spiral guide path having a hollow axial center is attached to an inner peripheral surface of a resin straight tube main body. A pipe with a spiral guide path, characterized in that the spiral guide path is formed by sandwiching a core material between a pair of resin layers.

The core material is preferably a resin elastic body, and more preferably the resin elastic body is also a foam.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a sectional view of a tube with a spiral guideway according to the present invention. The pipe 10 with a spiral guide path includes a straight tubular pipe body 11 made of resin, and the pipe body 11
And a spiral guide path 12 made of resin spirally provided along the inner peripheral surface of the.

As described above, such a pipe 10 with a spiral guide passage is arranged in a vertical state below the vertical sewer pipe, for example.
No. 0 is connected to a pipe with a spiral guide path provided in the vertical state on the upper side through a plurality of sub-pipes in the vertical state in which the inner peripheral surface is smooth.

The spiral guideway 1 of the tube 10 with the spiral guideway
2 has a core material 12f sandwiched between a pair of resin layers 12e, the thickness of which is the same as the diameter of the pipe body 11.
It is about 0.5 to 15%.

The spiral guide path 12 of the tube 10 with the spiral guide path
Is in a state of projecting inward over about 1/20 to 5/12 of the inner diameter of the pipe body 11, and the axial center portion is hollow over the entire length. Therefore, the axial center of the pipe body 11 is also hollow over the entire length.

The core material 12f of the spiral guide path 12 is made of a material having a large elongation such as a resin elastic body, natural wood, or a processed product thereof. In particular, it has excellent workability, and
A resin elastic body having excellent adhesiveness to each resin layer 12e is suitable.

Examples of the resin elastic body used as the core material include rubber resins such as urethane resin, SBR, NBR, and EPDM, foams thereof, and polyvinyl chloride resin (P
VC), polyethylene (PE) and polypropylene (P
P) and other olefin resins, acrylic resins and other thermoplastic resins, and foams thereof. In particular, the foam is
It is preferable because it is lightweight and economical. Heartwood 12
The foam used as f preferably has an expansion ratio of about 1.5 to 25 times.

As the resin layer 12e of the spiral guide path 12,
Thermoplastic resins and thermosetting resins are used. Examples of the thermoplastic resin include polyvinyl chloride resin and olefin resins such as polyethylene and polypropylene.

When polyvinyl chloride resin is used as the resin layer 12e, polyvinyl chloride foam is preferably used as the core material 12f, and the core material 12f made of polyvinyl chloride foam is made of polyvinyl chloride resin. It is adhered to the resin layer 12e with an adhesive or integrated with a selka structure. When a polyvinyl chloride resin is used as the resin layer 12e, it is formed into a plate shape by extrusion and then formed into a spiral shape, or is directly formed into a spiral shape by extrusion molding.

When an olefin resin is used as the resin layer 12e, a foam of the olefin resin is a core material 12f.
Is preferably used as. In this case, a resin layer 12e made of an olefin resin such as polyethylene or polypropylene is fused or adhered to both surfaces of a foam of an olefin resin such as polyethylene or polypropylene prepared in advance as the core material 12f.

Examples of the thermosetting resin used for the resin layer 12e include unsaturated polyester resin, vinyl ester resin and epoxy resin. Furthermore, these resins are used for inorganic fibers, glass fibers, organic fibers, carbon fibers,
Those reinforced with fibers such as aramid fibers and vinylon fibers can also be used.

When a thermosetting resin is used as the resin layer 12e, the core material 12f is made of expanded polystyrene, styrene-polyethylene copolymer, urethane foam, polyethylene foam, polypropylene foam, acrylic foam, polychlorinated material. Vinyl foam or the like is used. When a styrene foam is used, it is desirable to interpose a solvent resistant layer such as a urethane foam layer between the styrene foam and the resin layer 12e in order to dissolve the styrene in the solvent. Also, the core material 12f
When polyethylene foam or polypropylene foam is used as the material, interposing a surface mat or the like with each resin layer 12e made of a thermosetting resin improves adhesiveness with each resin layer 12e, which is preferable. . Furthermore, it is preferable that the foam used as the core material 12f is reinforced with fibers such as glass fibers, because the strength of the core material 12f is improved.

The tube body 11 is made of a thermoplastic resin, a thermosetting resin or the like. As the thermoplastic resin, vinyl chloride resin, olefin resin (polyethylene, polypropylene, etc.), methacrylic resin, etc. are used. Further, as the thermosetting resin, unsaturated polyester resin,
A vinyl ester resin, an epoxy resin, or the like is used, and those obtained by reinforcing these resins with fibers such as inorganic fibers, glass fibers, organic fibers, carbon fibers, aramid fibers, and vinylon fibers can also be used.

When the tube body 11 is manufactured from a fiber reinforced resin, a fiber reinforced polyvinyl chloride resin or an unsaturated polyester resin is used as the resin layer 12e of the spiral guide path 12, and a core material 12f is used. It is economical and particularly preferable to use urethane foam.

A tube 10 with a spiral guideway having such a structure
Is, for example, after the spiral guide path 12 is manufactured, the pipe body 1 is
Manufactured by inserting into 1.

It should be noted that the spiral guideway thrust tube 10 of the present invention only needs to have a hollow shaft center portion of the pipe main body portion 11. Therefore, a hollow support shaft is provided at the shaft center portion of the pipe main body portion 11. A spiral guide path 12 may be provided on the support shaft.

[0031]

【Example】

<Embodiment 1> A tube 10 with a spiral guide path according to the present invention shown in FIG.
Was manufactured as follows. First, as shown in FIG. 2A, for example, a core material 12f made of a polyvinyl chloride foam (foaming ratio: 20 times) having a thickness of 10 mm is provided between a pair of polyvinyl chloride resin layers 12e having a thickness of 5 mm. Rectangular plate 1 with a sandwich
2a was prepared, and an annular plate 12b was cut out in an annular shape from this rectangular plate 12a. FIG. 2B shows the cut out annular plate 12b, which has a thickness of 20 mm and an outer diameter of 100.
It has a diameter of 0 mm and an inner diameter of 300 mm. Then, on the annular plate 12b, one cut 12c along the radial direction is formed.
Disconnected by.

Next, the annular plate 12b is blown with hot air having a temperature of 80 to 100 ° C. by a blower to be in a molten state, and as shown in FIG. 2 (c), each end portion adjacent to the cut 12c is closed. The spiral plate 12d was manufactured by pressing in a direction away from each other to form a spiral shape. Thereafter, as shown in FIG. 2D, the spiral plates 12d were arranged concentrically along the axial direction, and the ends of the spiral plates 12d adjacent to each other were welded to each other. As a result, the shaft center is hollow, and
A spiral guideway 12 with an axial length of 600 mm per 5 pitches was produced. The manufactured spiral guide path 12 is entirely in a state in which a core material 12f made of a vinyl chloride resin foam is sandwiched between a pair of polyvinyl chloride resin layers 12e.

The spiral guideway 12 manufactured in this way
On the outer peripheral surface thereof, a primer for adhesion of vinyl chloride resin (Mitsui Toatsu Chemicals, Inc., trade name "OP-2017"),
Epoxy resin adhesive is applied in order, and the spiral guide path 12 is inserted in the tube body 11 (thickness 6 mm) made of glass fiber reinforced unsaturated polyester resin (glass fiber volume content 55%). did. Then, the tube body 11 and the spiral guide path 12 were heated and cured to manufacture the tube 10 with the spiral guide path.

When the manufactured pipe 10 with a spiral guide path was made vertical and water was flowed at a flow rate of 50 L / sec, the displacement at the side edge portion on the inner peripheral side of the spiral guide path 12 was 6 mm or less. It was In addition, the outer peripheral surface of the spiral guide path 12 and the pipe body 1
No peeling from the inner peripheral surface of No. 1 occurred, the distortion of the bonded portion between both was 0.5% or less, and the spiral guide path 12 had sufficient strength.

<Embodiment 2> In this embodiment, as shown in FIG. 3 (a), an inner mold 30 for a guide path is prepared in which a spiral guide path forming portion 32 is provided on a support shaft 31 in a protruding state. . The guide path inner mold 30 is used to mold the spiral guide path 12 by the hand lay-up molding method, and has a size and a shape corresponding to the spiral guide path 12 to be molded.

At the same time, an unsaturated polyester resin was prepared, and 450 g / m ² of glass cloth and 330
A g / m ² chopped strand mat was prepared, respectively. Then, the roving and the glass cloth are respectively impregnated with the unsaturated polyester resin, and the spiral guideway forming portion 32 of the guideway inner mold 30 has a thickness of 5 m.
Then, roving and glass cloth were sequentially laminated by hand to obtain m (hand lay-up method) to form one resin layer 12e. Next, a urethane foam having a foaming ratio of 20 times and a thickness of 10 mm is laminated on the resin layer 12e to form a core material 12f, and then the core material 12f is formed.
Again, the roving and the glass cloth were laminated manually to form the other resin layer 12e having a thickness of 5 mm.

Then, the entire inner mold 30 for the guideway is heated to 70 ° C.
Each of the resin layers 12 made of glass fiber reinforced resin laminated on the spiral guide path forming portion 32 by heating at a temperature of 1 hour for 1 hour.
e was cured. Each resin layer 12 made of glass fiber reinforced resin
When e is hardened, each hardened resin layer 12e
The resin layer 12e and the core material layer 12f in the laminated state were released from the guide path inner mold 30 by rotating the guide path inner mold 30 together with the guide path f. As a result, FIG.
As shown in, a pair of resin layers 1 made of glass fiber reinforced resin
A spiral guide path 12 having a urethane foam core material 12f sandwiched between 2e was obtained.

The obtained spiral guideway 12 has a thickness of 20 m.
m, and the outer diameter is 1000 m as in the first embodiment.
m, the inner diameter is 300 mm, and the spiral shape has an axial length of 1.5 pitch of 600 mm.

When the spiral guide path 12 is manufactured in this manner, a tube main body portion 11 similar to that of the first embodiment is prepared, and the spiral guide path 12 is inserted into the pipe main body portion 11 to form the pipe main body portion. 11 and the spiral guide path 12 were adhered to each other and heated and cured to manufacture the tube 10 with the spiral guide path.

In the manufactured pipe 10 with spiral path, 50 L
When water was flowed at a flow rate of / sec, the displacement at the inner peripheral side edge of the spiral guide path 12 was 5 mm or less. Also,
The outer peripheral surface of the spiral guide passage 12 and the inner peripheral surface of the pipe body 11 were not separated from each other, and the strain at the bonded portion between the two was 0.5% or less, which was sufficient strength.

Further, the sand slurry (mixture of No. 1 silica sand and water) at a flow rate of 2 m / sec was used for the tube 1 with the spiral guide path.
When flowed in 0, spiral guideway 1 after 100 hours
The wear amount of the resin layer 12e on the upper surface in No. 2 is 1% of the whole.
It was about.

For comparison, a spiral guideway made only of glass fiber reinforced plastic was used in a tube with a spiral guideway provided inside a glass fiber reinforced plastic tube body, and the sand slurry was used under the same conditions. As a result, the impact of the sand slurry was hardly absorbed by the spiral guideway, and the wear amount after 100 hours was 4% of the total.
It was about%.

[0043]

As described above, since the pipe with the spiral guide path of the present invention has the spiral guide path constituted by the core material sandwiched between the pair of resin layers, the flow rate increases. In addition, the core material can absorb the impact and suppress the occurrence of cracks. As a result, there is no risk of early damage and stable use over a long period of time is possible. Further, by using the core material, the weight can be reduced and the manufacturing is easy.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of a pipe with a spiral guideway according to the present invention.

2 (a) to 2 (d) are schematic views respectively showing manufacturing steps of the spiral guide passage in the embodiment 1 of the pipe with the spiral guide passage of the present invention.

3 (a) and 3 (b) are schematic views respectively showing a manufacturing process of the spiral guide passage in the embodiment 2 of the tube with the spiral guide passage of the present invention.

FIG. 4 is an exploded front view of the sewer pipe showing a usage state of the pipe with the spiral guide passage.

[Explanation of symbols]

 10 Pipe with spiral guide path 11 Pipe body 12 Spiral guide path 12a Rectangular plate 12b Annular plate 12c Cut 12d Spiral plate 12e Resin layer 12f Core material 30 Inner mold for guide path 31 Support shaft 32 Spiral guide path forming part

Claims (3)

[Claims] 1. An inner peripheral surface of a resin-made straight tube main body,
A pipe with a spiral guide path, to which a resin spiral guide path having a hollow axial center is attached, the spiral guide path having a core material sandwiched between a pair of resin layers. A pipe with a spiral guideway. 2. The tube with a spiral guide path according to claim 1, wherein the core material is a resin elastic body. 3. The resin elastic body is a foam.
The pipe with a spiral guideway described in.