JP2001355773A - Sealing method for resin pipe with spiral angle rib - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve sealing performance at a joint region. SOLUTION: A sealing method for resin pipes 10 is so designed that the resin pipes 10 with a continuously formed spiral angle rib 11 are butted on each other and the joint is band-joined with a band 2 tightened with joint flanges 3 and 4 at both ends being joined together. Filler members 20 molded from a foam material as a core 20A and enclosing rubber cement 20B are packed in part of and along troughs 12 between the angle ribs 11 situated in a narrower relation to the effective width of the band 2 so as to ensure a calculated area 0.9 to 2 times the sectional area of the troughs 12 between the angle ribs 11. A cemented foam sheet 7 is stuck up to the joint flanges 3 and 4 on the interior of the band 2 so as to cover the filler members 20. A thick-walled multilayer foam material 8 with a joint tape 9 glued to the resin pipes 10 side is next interposed between the joint flanges 3 and 4 prior to tightening.

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 fastening member 100 is tightened because the hardness of the sealing material 104 differs from that of the member embedded in the valley. 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 Of the foam material with the joining sheet
A multilayer foam material in which the joining sheet is stuck to the surface on the resin pipe side is interposed between the joining flanges and tightened.

[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. Note that the joining flange 4 is not provided on the end band as in the related art, but is provided on the band 2. A glued foam sheet 7 is attached to the inside of the band 2, and the foam sheet 7 extends to the inside of the joining flanges 3 and 4. A thick multi-layer foam material 8 is interposed between the joining flanges 3 and 4.

The multi-layer foam material 8 interposed between the joining flanges 3 and 4 is formed by joining a flange material 8 a provided along the joining flange 3 and a flange material 8 b provided along the joining flange 4 via a joining tape 9. It is preferable that the joining tape 9 between the foams 8a and 8b protrudes and is adhered to the bottom surface of the foam materials 8a and 8b, that is, the surface on the resin pipe side. Through the multilayer foam 8 and the resin tube 1
The sealing property with 0 is improved. That is, the joining flange 3,
The multi-layer foam material 8 (foam materials 8a, 8)
If the adhesiveness between b) and the resin pipe 10 is weak, water leaks will occur between the multilayer foam material 8 and the resin pipe 10, and the sealing property of the joint seam of the resin pipe 10 by the bonding band 1 will be reduced. Further, the sealing property between the multilayer foam material 8 and the resin tube 10 is ensured by the joining tape 9, and the occurrence of water channels is prevented.
As the bonding tape 9, a butyl rubber-based, chloroprene rubber-based, or acrylic resin-based adhesive tape may be used, and the sealing property may be secured by this adhesive force. It is preferable to use butyl rubber as the adhesive tape.

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 is 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 adhered to the joining flanges 3, 4, and then the thickness between the joining flanges 3, 4 is increased. By tightening the joining flanges 3 and 4 with the bolts 5 and the nuts 6 with the multi-layered foam material 8 interposed therebetween, the butt joint of the resin pipe 10 is sealed.

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 vinyl chloride resin), IIR, NR, NR / SBR, EPT, EPDM
Foamed rubber, PVC foam, styrene-based, urethane-based, and olefin-based elastomers. 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 of the upper end portion of the joint. The upper end of the multilayer foam material 8 is locked. That is, when the joining flanges 3 and 4 are tightened, the upper end of the multilayer foam material 8 interposed between the joining flanges 3 and 4 is locked by the projections 3a and 4a, so that the compressed multilayer foam material 8 is pressed. Is prevented from protruding from the upper end side of the joining flanges 3 and 4. As a result, pressure is applied so that the compressed multilayer foam material 8 protrudes toward the resin pipe 10, thereby increasing the adhesion between the multilayer foam material 8 and the resin pipe 10, and improving 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 becomes larger toward the resin pipe 10. It is formed as follows. By interposing a thick multi-layer foam material 8 between the joining flanges 3 and 4 and tightening it with bolts 5 and nuts 6 (see FIG. 7), the multi-layer foam material 8 can easily protrude to the resin pipe 10 side. , Compressed foam material 8 and resin tube 1
Further, the adhesion with the resin pipe 10 can be further improved, and the sealing property of the butt joint of the resin pipe 10 can be improved.

The contact surfaces of the multi-layer foam material 8 formed by laminating (joining) the foam materials 8a and 8b via the joining tape 9 with the joining flanges 3 and 4 are adjusted to the inclination of the joining flanges 3 and 4. It is preferable to incline and form the multilayer foam material 8 in a tapered shape. That is, by interposing the tapered multilayer foam material 8 corresponding to the inclination of the joining flanges 3 and 4 between the joining flanges 3 and 4, the resin pipe 10 is formed by the joining band 1 adjusted by the bolts 5 and the nuts 6. The tightening is ensured, and the thickness of the multilayer foam material 8 is increased toward the resin pipe 10, so that the multilayer foam material 8 easily protrudes toward the resin pipe 10, and the compressed foam material 8 is further compressed. The adhesion between the layer foam material 8 and the resin tube 10 is further improved, and the resin tube 10
Can improve the sealing property of the butt joint.

[0016]

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, Next, since a thick multi-layer foam material is interposed between the joining flanges, the deformation of the multi-layer foam material acts on the resin pipe due to the tightening force of the joining flange, so that the sealing property is ensured. . This effect is further enhanced by inclining the joining flange or by tapering the multi-layer foam material. In addition, by improving the sealing property between the multilayer foam material and the resin pipe with the bonding tape attached to the surface of the multilayer foam material on the resin pipe side, the resin foam side of the multilayer foam material interposed between the joining flanges is improved. It is possible to prevent the occurrence of water channels on the contact surface, and to ensure the sealing performance.
Also, using a soft closed-cell or semi-closed-cell foam material for the core of the filling member, butyl rubber glue around the periphery,
By wrapping it with a caulking material such as urethane or silicone, or a sealing material, the space between the valleys is filled with a filling material to ensure the sealability, and the butyl rubber paste has a lower viscosity than conventional putty, Excellent adhesion to adherends. Furthermore, by attaching the foam sheet to the joining flange, the attachment of the joining band also causes the foam sheet to be wound around the outer peripheral surface of the resin pipe, thereby improving workability.

[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 tightening).

FIG. 7 is a sectional view showing a state after tightening of a joining flange portion 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]

 DESCRIPTION OF SYMBOLS 1 Joining band 2 Band 3, 4 Joining flange 7 Foam sheet 8 Multilayer foam material 9 Joining tape 10 Resin tube 11 Angle rib 12 Valley 20 Filling member 20A core 20B Rubber glue

Claims (8)

[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 along the valley between the chevron ribs at a narrower position and molded around with rubber glue is calculated to be 0.9 to 2 times the cross-sectional area of the valley between the chevron ribs. Fill a part of the valley, apply a foam sheet glued to the inside of the band so as to cover the filling member, up to the joining flange, and then, between the joining flanges, a plurality of thick foam materials arranged along the joining flange surface Resin tubes having spiral chevron ribs, which are overlapped with each other via a bonding tape, and tightened by interposing a multilayer foam material in which the bonding tape is stuck to the surface on the resin tube side. Sealing method. 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 multi-layer foam material having a large thickness is engaged with an upper end portion of the joining flange by a convex portion formed on a joining surface side of an upper end portion of the joining flange. For sealing resin pipes with spiral ribs. 6. The method according to claim 1, wherein the joining flanges are inclined toward the other joining flange, and an 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 items 5 to 5. 7. The resin pipe having a helical chevron rib according to claim 6, wherein the thickness of the thick multilayer foam material interposed between the joining flanges increases toward the resin pipe. Sealing method. 8. The method according to claim 1, wherein a rubber-based adhesive tape is used as the joining tape.