JP2001059593A - Sealing method for resin pipe having spiral ridge-shaped rib - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance sealability in a joining portion. SOLUTION: A filling member 20 of which a periphery is formed by a rubber paste 20B using a foamed material as a core 20A is filled in one portion of a ravine 12 along the ravine 12 between ridge-shaped ribs 11 located in a position narrower than an effective width of a band 2 while calculating a cross-sectional area to be brought into 0.9-2 times of a cross-sectional area of the ravine 12 between the ridge-shaped ribs 11, in this sealing method for a resin pipe 10 joined by butting the resin pipes 10 formed continuously with the spiral ridge-shaped rib 11, by joining fellow joining flanges 3, 4 of both ends in their joint line, and by fastening the band 2 to conduct the band joining. A foamed sheet 7 paste-treated in an inner side of the band 2 to coat the filling member 20 is bonded onto the joining flanges 3, 4 to be followed by fastening thereafter while interposing a thick foamed material 8 between the flanges 3, 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for sealing a resin tube having a spiral angled rib.

[0002]

2. Description of the Related Art Resin pipes of this type are widely used for civil engineering drainage pipes in lands such as golf courses because of their light weight and ease of construction. In order to join the resin pipes having such helical mountain-shaped rubbers by abutting each other, the valley between the ribs is filled with putty in a small-diameter resin pipe, and the valley in a large-diameter resin pipe is formed of soft urethane foam. Fill it with a rod of rectangular cross section or rubber with trapezoidal cross section, and cover it with putty. After filling a part of the valley in this way and overflowing from the chevron rib, cover with a sheet of polyethylene foam,
A part is wrapped and temporarily fixed with tape, and this part is fastened with a joining band. As shown in FIGS. 8 and 9, the joining band 100 has a band 101 wound on a chevron rib of a resin tube 200, and joining flanges 102 and 103 provided at both ends of the band 101. The end of the band 101 provided with the joining flange 102 is inserted under the end band 101A provided with the other joining flange 103. The end band 101A is fixed to one end of the band 101. This bonding band 1
00 is made of resin or metal, and has a protruding portion that protrudes into a valley inside, thereby preventing the joining band 100 from shifting in the axial direction. The band 101 of the joining band 100 tightens a sealing member 104 made of a sheet of polyethylene foam on the chevron rib. The joining flanges 102 and 103 are fastened with bolts 105 and nuts 106.

[0003]

However, in the conventional joining method as described above, there is an uneasiness in the sealing property. This is because the member embedded in the valley with the sealing material 104 cannot be sufficiently crushed, or the tightening band 100 is tightened due to the difference in hardness between the member embedded in the valley and the sealing material 104. This is because the sealant 104 was sometimes damaged, and the sealant 104 was moved to cause wrinkles. In the state of FIG. 9, when the bolt 105 and the nut 106 are further tightened, the gap between both ends of the band 100 is eliminated, and the tightening causes wrinkles in the seal material 104 indicated by the arrow X.
Sealing property was impaired. Further, the presence of the space indicated by the arrow X makes it impossible to transmit the compressive force at the time of band joining to the sealing material 104, thus impairing the sealing performance at this location.

[0004] Therefore, an object of the present invention is to provide a sealing method in which the sealing performance at the joint is improved.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention relates to a band formed by abutting resin pipes in which chevron-shaped ribs are continuously formed in a spiral shape, and joining the joints thereof by joining joining flanges at both ends. In a method of sealing a resin pipe to be band-tightened, a filling member formed of a foam material as a core along the valley between the chevron ribs located at a position narrower than the effective width of the band and the periphery thereof is molded with rubber glue is used as a seal between the valleys between the chevron ribs. Calculate so that it becomes 0.9 to 2 times the cross-sectional area, fill a part of the valley, apply a foam sheet glued to the inside of the band to cover this filling member, up to the joining flange, and then between the joining flanges It is tightened with a thick foam material interposed.

[0006]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a bonding band 1 at a seal location.
The joining band 1 is provided with joining flanges 3 and 4 at both ends of the band 2, and these joining flanges 3 and 4 are fastened with bolts 5 and nuts 6. Glue-processed foam sheet 7 inside band 2
The foam sheet 7 extends to the inside of the joining flanges 3 and 4. A thick foam material 8 is interposed between the joining flanges 3 and 4. The joining flange 4 is provided on the band 2 instead of the conventional end band.

FIG. 2 shows a cross section of an abutting portion of the resin tube 10. The resin tube 10 has a chevron rib 11 continuously formed in a spiral shape. A valley 12 is formed between the chevron ribs 11. When the ends of the two resin pipes 10 are abutted to each other to join the seam to the band, the filling member 20 is moved along the valley 12 between the chevron ribs 11 at a position narrower than the effective width of the band 2. Fill the part. This filling member 20 is made of a foam material having a core 20A, and a rubber
It was molded at 0B. As the rubber paste 20B, a butyl rubber type is suitable. Note that a caulking material such as urethane or silicone may be used, or a sealing material may be used. Then, the filling member 20 is calculated to be 0.9 to 2 times the cross-sectional area of the valley 12 between the chevron ribs 11, and is filled in a part of the valley 12. When the filling member 20 has been filled in the valley 12, a foam sheet 7 glued to the inside of the band 2 so as to cover the filling member 20 is attached to the joining flanges 3 and 4, and then the thick sheet is provided between the joining flanges 3 and 4. The joining flanges 3 and 4 are fastened with the bolts 5 and the nuts 6 with the foam material 8 interposed therebetween to seal the butt joint of the resin pipe 10.

FIG. 3 is a schematic diagram showing the dimensions of a typical resin tube 10 to which the sealing method of the present invention is applied. The unit of the dimension in the drawing is mm. Such a resin tube 10 is generally formed of polyethylene and has a bore size of 3 shown in the figure.
It is applicable not only to 00 mm but also to about 1000 mm.

As the core 20A of the filling member 20, as shown in FIG. 4, a material using a hard foam material or a solid rubber material and a soft closed cell or semi-closed cell foam material around the periphery can be used. .

The density of the surrounding foam material constituting the core 20A of the filling member 20 shown in FIG. 4 is set to 0.04 to 0.3, and the JIS C hardness is 5 to 35 or JIS K6767.
50% compression hardness at 100 to 1000 gf / cm ²
It is preferable that As the core 20A of the filling member 20, CR, NBR / PVC (blended rubber in which a partially crosslinked nitrile rubber is mixed with a vinyl chloride resin), IIR, NR, NR / SBR, EPT, EPDM
For example, foamed rubber or PVC foam, styrene-based, urethane-based, or olefin-based elastomer can be used. A similar material can be used for the foam sheet 7. Further, in the present invention, there is no method in which the joining flanges 3 and 4 are abutted and one end of the band 2 is inserted into the other end.

FIGS. 5 to 7 are cross-sectional views showing another embodiment of the bonding band 1 at the above-mentioned sealing portion. In the joining band 1 shown in FIG.
The protrusions 3a, 4a are formed on the joint surface side at the upper end of the joint, and the thickness interposed between the joint flanges 3, 4 by the protrusions 3a, 4a when the joint flanges 3, 4 are tightened with bolts 5 and nuts 6. The upper end of the meat foam material 8 is locked. That is, when tightening the joining flanges 3 and 4,
The upper end of the foam material 8 interposed between the four
By this, the compressed foam material 8 is prevented from protruding from the upper end side of the joining flanges 3 and 4. As a result, the compressed foam material 8 is
Pressure is applied so as to protrude toward the zero side, the adhesion between the foam material 8 and the resin pipe 10 is increased, and the sealing property of the butt joint of the resin pipe 10 can be improved.

Further, in the joining band 1 shown in FIGS. 6 and 7, the joining flanges 3 and 4 are inclined toward the other joining flange, and the interval between the joining flanges 3 and 4 increases toward the resin pipe 10. With this configuration, when the thick foam material 8 is interposed between the joining flanges 3 and 4 and tightened with the bolts 5 and the nuts 6 (see FIG. 7), the foam material 8 becomes closer to the resin pipe 10. As a result, the adhesiveness between the pressed foam material 8 and the resin pipe 10 is further improved, and the sealing property at the joint of the resin pipe 10 can be improved.

It is preferable that the joining surface of the thick foam material 8 with the joining flanges 3 and 4 is inclined in accordance with the inclination of the joining flanges 3 and 4, so that the foam material 8 is formed in a tapered shape. By interposing the tapered foam material 8 corresponding to the inclination of the joining flanges 3 and 4 between the joining flanges 3 and 4, the fastening of the joining flanges 3 and 4 by the bolts 5 and the nuts 6 is ensured, and the foam is formed. Since the thickness of the material 8 is increased toward the resin pipe 10, the foam material 8 is likely to protrude toward the resin pipe 10. That is, the fastening of the joining band resin tube 10 adjusted by the bolts 5 and the nuts 6 is assured, the tightness between the pressed foam material 8 and the resin tube 10 is further improved, and the butt joint of the resin tube 10 is sealed. Performance can be improved.

[0015]

As described above, according to the present invention, a filling member formed of a foam material as a core and formed of rubber glue around the valley between the chevron ribs located at a position narrower than the effective width of the band is chevron. It is calculated to be 0.9 to 2 times larger than the cross-sectional area of the valley between the ribs, filling a part of the valley, pasting a foam sheet glued to the inside of the band to cover this filling member up to the joining flange, Then, since a thick foam material is interposed between the joining flanges, the deformation of the foam material acts on the resin pipe due to the tightening force of the joining flange, so that the sealing property is ensured. In addition, a soft closed cell or semi-closed cell foam material is used as the core of the filling member, and the surrounding area is wrapped with rubber glue, urethane type, silicone type caulking material, sealing material, etc. The filling member is filled to ensure the sealing property, and the butyl rubber paste has a low viscosity unlike conventional putty, and has excellent adhesiveness to the adherend. Furthermore,
By attaching the foam sheet to the joining flange, the attachment of the joining band is also performed by winding the foam sheet around the outer peripheral surface of the resin pipe, and the workability is also improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a joint flange.

FIG. 2 is a cross-sectional view of a butted portion of a resin tube.

FIG. 3 is a simplified diagram of a commonly used resin tube.

FIG. 4 is a sectional view showing another example of a filling member.

FIG. 5 is a cross-sectional view showing another example of a joint flange portion in FIG. 1;

FIG. 6 is a cross-sectional view showing a still further embodiment of the joining flange portion in FIG. 1 (state before fastening).

FIG. 7 is a sectional view showing a state after fastening of the joining flange in FIG. 6;

FIG. 8 is a front view of a joint portion showing a conventional example.

FIG. 9 is a cross-sectional view of a joint flange portion in FIG.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 joining band 2 band 3, 4 joining flange 7 foam sheet 8 foam material 10 resin pipe 11 chevron rib 12 valley 20 filling member 20A core 20B rubber glue

Claims (7)

[Claims] 1. A method for sealing a resin pipe in which a resin pipe formed by continuously forming helical helical ribs in a helical shape and joining a joint thereof by joining joining flanges at both ends to tighten a band is used. A filling member formed of a foam material as a core and formed of rubber paste around the valley between the chevron ribs at a narrower position is calculated so that the cross-sectional area between the valleys between the chevron ribs becomes 0.9 to 2 and the valley. A spiral-shaped foam sheet is formed by filling a part of the sheet, pasting a foam sheet glued to the inside of the band so as to cover the filling member to the joining flange, and then interposing a thick foam material between the joining flanges. Sealing method for resin pipes with chevron ribs. 2. The core of the filling member according to claim 1, wherein a soft closed cell or semi-closed cell foam material is used around a hard foam material or solid rubber material. A method for sealing resin pipes with spiral chevron ribs. 3. The JI according to claim 2, wherein the density of the surrounding foam material constituting the core of the filling member is 0.04 to 0.3.
A method for sealing a resin tube having a helical chevron rib, wherein the SC hardness is 5 to 35 or the 50% compression hardness in JIS K6767 is 100 to 1000 gf / cm ² . 4. The method according to claim 1, wherein the periphery of the filling member is formed of rubber glue or a sealing material. 5. The spiral according to claim 1, wherein an upper end portion of the thick foam material is locked by a convex portion formed on an upper end joining surface side of the joining flange. Sealing method for resin pipes with chevron shaped ribs. 6. The connecting flange according to claim 1, wherein the joining flanges are inclined toward the other joining flange, and the interval between the joining flanges is increased toward the resin pipe.
6. The method for sealing a resin tube having a helical chevron rib according to any one of the above items 5. 7. The resin pipe seal having a helical chevron rib according to claim 6, wherein the thickness of the thick foam material interposed between the joining flanges increases toward the resin pipe. Method.