JPS6330141B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a resin pipe having a flange at its end made of a shell made of fiber-reinforced resin and mortar.

Conventionally, the flanges formed at the ends of resin pipes to connect them have all been made of fiber-reinforced resin containing glass fibers or the like. This conventional structure is suitable because it is made of fiber-reinforced resin and has strong surface stress, but on the other hand, fiber-reinforced resin is expensive and increases the overall price, and the flange needs to be made more rigid. Even though it is a material, sufficient rigidity could not be expected.
Therefore, as a flange, a laminate of a fiber-reinforced resin skin and mortar has been considered, and according to this,
Although the skin can be expected to provide the same strong surface stress as before, the mortar can be expected to provide higher rigidity and lower costs.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing a resin pipe with end flanges, which allows the above-mentioned flanges to be obtained easily, reliably, and efficiently.

In order to achieve the above object, the method for manufacturing a resin pipe with an end flange according to the present invention includes forming a V-shaped inclined surface on the outer surface of the intermediate portion of the resin pipe, and making the innermost part of the V-shaped inclined surface face opposite to the innermost part of the V-shaped inclined surface. A medium size consisting of at least one of a fiber-reinforced resin end skin and a separator is disposed, and at least one of a fiber-reinforced resin inner skin and a separator is arranged so as to face both outer sides of the V-shaped inclined surface. Place the outer molds consisting of
At that time, at least one of the end face skin and the inner skin is placed, and a cylindrical spacer is interposed between the middle mold and the outer mold, and a fixture passing through the spacer is used to hold both molds together. Integrate, then attach an outer mold between the outer peripheral surfaces of both molds, inject mortar into the space formed by each mold and let it harden, then remove the outer mold,
Remove the fixture and remove the separator, then
The innermost part of the V-shaped inclined surface is cut.

According to the method of the present invention, it is possible to obtain a resin pipe having a flange at the end, which is made of at least one of an end skin and an inner skin, and mortar laminated thereon, and moreover, it is possible to obtain a resin pipe having a flange at the end, which is made of at least one of an end face skin and an inner skin, and mortar laminated thereon. You will get it.

An embodiment of the present invention will be described below based on the drawings. First, as shown in FIG. 1, a resin tube 2 is placed on a wheel 1 that is linked to a drive device, and the resin tube 2 is made rotatable around a tube axis 3. Here, the resin pipe 2 may be made of fiber-reinforced resin containing glass fiber or the like, or may be made of ordinary resin without any interior therein. Furthermore, a corrosion-resistant layer 4 is laminated on the inner surface of the resin tube 2. First, while rotating the resin tube 2, a V-shaped inclined surface 5 is formed on the outer surface of the intermediate portion thereof. This shaping is performed by operating a polishing device (grinder) 8 consisting of a motor 6 and a polishing body 7, and bringing the polishing body 7 into contact with the outer surface of the intermediate portion of the resin tube 2. At that time, one polishing device 8
Since only one sloped surface can be formed by 2.
A stand of polishing devices 8 may be prepared, or one polishing device 8 may be displaced by 180 degrees and used twice.
Simultaneously with forming the V-shaped inclined surface 5, a plurality of annular recesses 9 are formed as shown in FIG. Next, as shown in FIGS. 3 to 5, the middle mold 10 is placed so as to face the innermost part of the V-shaped inclined surface 5. This medium size 10
consists of a separator 11 located at the center, and end face skins 12 made of fiber-reinforced resin attached to both sides of the separator 11. The separator 11
is ring-shaped as a whole, and is divided into a plurality of parts (four in the embodiment) in the circumferential direction. Therefore, each divided body is applied to the innermost part from the outside to form a ring shape, and the connecting member 13 is inserted between the adjacent outer circumferential parts, and the connecting member 13 is divided by bolts 14. It is integrated by being fixed to the body. The separator 11 has through holes 15 formed at a plurality of locations in the circumferential direction. The end surface skin 12 is an annular thin plate as a whole, and is arranged so that its outer periphery is perpendicular to the tube axis 3.
An annular recess 16 is formed into which a ring is inserted. The end face skin 12 is manufactured by incorporating short glass fibers (chopped strands) into a resin, and is divided into a plurality of pieces in the circumferential direction. Note that a through hole 17 that matches the through hole 15 of the separator 11 is formed in the end surface cover 12 . Outer molds 18 are disposed facing each other on both outer sides of the V-shaped inclined surface 5. These outer molds 18
consists of an inner skin 19 made of fiber-reinforced resin similar to the end face skin 12, which is integrally formed in an annular shape, and whose inner end is curved and extends along the outer surface of the resin tube 2. Similarly, the inner skin 19 has through holes 2.
0 is formed. Between the end face skin 12 and the inner skin 19, through holes 17 and 20 are formed inside thereof.
A cylindrical spacer 21 that matches the spacer 21 is interposed, and the molds 10 and 18 are integrated by means of fixing devices (bolts, nuts, etc.) 22 passing through the through holes 15, 17, 20 and the spacer 21. Then each type 10,
An outer circumferential mold 23 is attached between the outer circumferential surfaces of 18. This outer peripheral mold 23 is formed by wrapping vinylon film, unstretched film, or the like, for example. An air vent (gas vent) 24 is provided at the upper part of the outer peripheral mold 23, and a mortar supply pipe 26 from a pressurized tank 25 is connected to the lower part. Mortar 27 is placed inside the pressurized tank 25.
A pneumatic or water pressure pump 28 is connected to the upper part. Therefore, the outer circumferential type 2
After installing the mortar 2, the pump 28 is operated to pressurize the pressure tank 25.
7 is connected to each mold 10, 1 through the mortar supply pipe 26.
The air is injected into the space formed by the resin tube 8 and the resin tube 2, and the internal air is exhausted from the air vent 24 at this time. The mortar 27 is made of sand and resin,
If the sand is 100%wt, the ratio is 20~20% of the resin.
It is set at 40% wt. In addition, 100% wt of sand is mixed with 60% wt of large silica sand (silica sand No. 2 to 4), 30% wt of medium silica sand (silica sand No. 5 to 8), and 10% wt of small silica sand (tankal). ing. After the injected mortar 27 is solidified, the outer mold 23 is removed, and
Remove the fixture 22 and remove the separator 11,
The state shown in FIG. 6 is now established. At this time, spacer 2
1 is left in the mortar 27. Next, a cutting blade is inserted through the space created between the end surface skins 12 to cut the innermost part of the V-shaped inclined surface 5. This allows the flange 2 to be attached to the end as shown in Figures 7 and 8.
Two resin tubes 2 with 9 can be manufactured.

At that time, both the through holes 17 and 20 and the inside of the spacer 21 form a bolt insertion hole for connection.

In the embodiment, the middle size 10 is replaced by a separator 11.
Although it is configured by a combination of the end surface cover 12 and the end surface cover 12, it may be either one of them. Also, the outer mold 18
Although the inner skin 19 is shown as a separator, this may be replaced with a separator or a combination of both. What is required is that the final product has both skin bodies 1
At least one of 2 and 19 constitutes a part of flange 29.

According to the method for manufacturing a resin pipe with an end flange according to the present invention described above, the resin pipe has a flange at the end, which is made of at least one of an end skin and an inner skin, and mortar laminated thereon. A tube can be obtained easily, reliably, and efficiently.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a partially cutaway side view showing a state in which a V-shaped inclined surface is formed, FIG. 2 is a longitudinal sectional side view of a V-shaped inclined surface, and FIG. 3 is a mold arrangement state. FIG. 4 is a cross-sectional view taken along line AA in FIG. 3, FIG. 5 is a cross-sectional view taken along line B-B in FIG. 7 is a side view of the product, and FIG. 8 is a vertical sectional side view of the main parts in FIG. 7. 2... Resin pipe, 3... Tube axis, 5... V-shaped inclined surface, 8... Polishing device, 10... Medium size, 11... Separator, 12... Skin for end face, 18... Outer mold ,
19... Inner skin, 21... Spacer, 22...
...Fixing tool, 23...Perimeter mold, 27...Mortar,
29...Flange.

Claims (1)

[Claims] 1 Forming a V-shaped inclined surface on the outer surface of the intermediate part of the resin pipe,
A medium mold made of at least one of a fiber-reinforced resin end face cover and a separator is placed facing the innermost part of the V-shaped slope, and a medium mold made of fiber-reinforced resin is placed facing both outer sides of the V-shaped slope. An outer mold made of at least one of an inner skin and a separator made of reinforced resin is placed, and at least one of the end face skin and the inner skin is placed, and the middle mold and the outer mold are arranged. A cylindrical spacer is interposed between the two molds, and a fixture passing through the spacer is used to integrate both molds, and then an outer peripheral mold is attached between the outer circumferential surfaces of both molds. An end portion characterized by injecting mortar into the space and solidifying it, then removing the outer mold, removing the fixture and removing the separator, and then cutting the innermost part of the V-shaped inclined surface. Method for manufacturing flanged resin pipes.