JP2001059592A - 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 1 wherein a rubber paste 1B is formed in a periphery of a slightly rigid foamed material 1A having closed cells or semi- closed cells is filled in one portion of a ravine 201 between ridge-shaped ribs 202 located in a position narrower than an effective width of a band while calculating a cross-sectional area thereof to be brought into 0.9-2 times of a cross-sectional area of the ravine 201 between the ridge-shaped ribs 202, and a foamed sheet 2 paste-treated (2A) in its inner face to coat the filling member 1 is wrapped to conduct band joining thereafter, in this sealing method for a resin pipe 200 joined by butting the resin pipes 200 formed continuously with the spiral ridge-shaped rib 202, by joining fellow joining flanges of both ends in their joint line, and by fastening the band to conduct the band joining.

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 chevron ribs by abutting each other, the valley between the chevron ribs is filled with putty in a small diameter resin pipe, and as shown in FIG. The narrow valley 201 is filled with a rod-shaped body or a trapezoidal cross-section rubber (that is, a filling member) of a soft urethane foam, and the periphery thereof is covered with a putty. As described above, a part of the valley 201 is filled and overflowed from the chevron rib 202, then covered with a sheet of polyethylene foam (sealant 104), partially wrapped and temporarily fixed with tape, and this part is joined with a bonding band. Tightening. As shown in FIGS. 9 and 10, the bonding band 100 is a band 101 wound on a chevron rib 202 of a resin tube 200.
And joining flanges 1 provided at both ends of the band 101
02, 103, and the end of the band 101 provided with one joining flange 102 is connected to the other joining flange 103.
Is inserted under the end band 101A provided with the. The end band 101A is fixed to one end of the band 101. As this bonding band 100,
It is made of resin or metal, and has a protruding portion that protrudes into a valley inside to prevent the joining band 100 from shifting in the axial direction. The band 101 of the bonding band 100 tightens a sealing member 104 made of a sheet of polyethylene foam on the chevron rib 202. Joining flange 102,
103 is tightened with a bolt 105 and a nut 106.

[0003]

The above-mentioned sealing material 104
Almost no sealability can be expected. This is because the use of a polyethylene foam sheet and the selection of a filling member that can seal the gap between the valleys are problematic. Polyethylene foam is the cheapest and water-resistant material among foam materials. However, since the surface is hard, it is most unsuitable for a sealing material used for wrapping. Further, it is a material that has poor adhesion to the surface to be sealed, does not easily adhere to the adhesive, and easily leaks. Putting a putty in a valley and deforming it with the tightening force of the bonding band may be successful depending on the hardness of the putty.However, putty exhibits a sealing effect by bonding, and softer ones tend to have stronger adhesive strength. There is. But,
The softer the object, the more deformed by external force and the easier it is to flow. It is difficult to maintain sealing performance with a putty-like material. Further, in the method of using urethane foam and putty together with a large diameter, the urethane foam is too soft and a soft putty is selected in order to crush the putty. Further, water flows through the inside of the urethane foam due to the open cells. If hard foam with closed cells is used in combination with putty instead of urethane foam, the putty will be pushed by the polyethylene sheet. As described above, the currently used materials have various disadvantages, and the sealing performance is not sufficiently exhibited. FIG.
When the bolt 105 and the nut 106 were further tightened in the state of 0, the gap at both ends of the band 100 was eliminated, and the tightening wrinkled the seal member 104 indicated by the arrow X, thereby impairing the sealing performance.

[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 the method of sealing resin pipes that are tightened and joined with a band, filling with closed or semi-closed cells around a slightly harder foam material along a valley between chevron ribs located at a position narrower than the effective width of the band. The member has a sectional area of 0.9 or more than the sectional area of the valley between the chevron ribs.
バ ン ド 2 times, preferably 1.1 to 1.5 times, filled into a part of the valley, and banded after wrapping by winding and wrapping a foam sheet glued to the inner surface to cover this filling member It is to join.

[0006]

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

FIG. 1 shows an enlarged cross section of a joining portion of a resin pipe 200, and a foam material 1 slightly harder along a valley 201 located at a position narrower than the effective width of the band 101 (see FIG. 7).
The filling member 1 in which the rubber paste 1B is formed around A is calculated so that the cross-sectional area thereof is 0.9 to 2 times, preferably 1.1 to 1.5 times the cross-sectional area of the valley 201. 201
Is filled in a part of. The filling member 1 has an inverted trapezoidal cross section, and uses a slightly hard foam material 1A extruded with closed cells or semi-closed cells. As the resin pipe 200 to be applied, a polyethylene bore of 300 to 10
The one of 00 mm is preferable. Valley 20 of resin tube 200
After filling the filling member 1 with the filling member 1, a foam sheet 2 having an inner surface subjected to glue processing 2A is wound around the filling member 1 and wrapped. At this time, the surface of the glue processing 2A is adhered to the upper surface of the filling member 1 and the chevron rib 202, and wound while slightly applying tension, and the ends are overlapped. Next, band bonding is performed in the same manner as shown in FIG.

In FIG. 2, a plate-like, slightly hard foam material 1A is used as the filling member 1, and a rubber paste 1B is formed around the foam material 1A.
The two-folded state is filled in the valley 201 as the filling member 1.

The foam material 1A shown in FIG.
It can be extruded according to the cross-sectional shape, but the cost increases due to the mold cost, so it is formed into a rectangular cross-section, and the valleys 201 of various sizes due to the difference in diameter by cutting and other processing methods. The cost can be reduced by roughly adjusting to the cross-sectional shape. A foam material 1A shown in FIG.
The filling is performed according to the shape of the valley 201 from the beginning, and the cost can be reduced as compared with the one formed by extrusion molding according to the shape of the valley 201 from the beginning. Can be handled. It is not sufficient to simply fill the shape of the foam material 1 in accordance with the shape of the valley 201, so that the sealing property is not sufficient. Therefore, the foam material 1A is covered with the rubber paste 1B over the entire circumference, and the sealing property is secured by the rubber paste 1B. . Alternatively, a sealing property may be ensured by a liquid sealing material, and silicone-based and urethane-based sealing materials may be used. As the rubber paste 1B, use of a butyl rubber type is preferable. Butyl rubber-based rubber paste 1B has a low viscosity unlike putty,
Excellent adhesion to adherends. A compressive force is applied to the joint portion of the resin pipe 200 by the band joining, and even when this joint portion is deformed, the rubber glue is formed by the elastic force of the foam material 1A (filled in the valley 201 in a compressed state). It is pressed against the wall of 201 and does not impair the sealing performance.

The foam sheet 2 has a density of 0.04 to 0.04.
0.4, preferably 0.08 to 0.4, according to JIS
C hardness 5-40, or 5 in JIS K6767
It is a closed-cell foam that satisfies the condition of 0% compression hardness of 100 to 1000 gf / cm ² , and EPDM foam is preferable to polyethylene or polypropylene foam. In particular, the closed cell type of EPDM foam having a cell number of 30 to 100 and a density of 0.1 has a large water stopping effect because the deformation due to the tightening force at the time of band joining is large. Density of EPDM foam body having closed cells
In the vicinity of 1, the degree of deformation due to the tightening force is large, and by performing glue processing 2A on the inner surface, sufficient sealing performance is exhibited by hand-tightening. Although the tightening force of the bonding band 100 has an effect in terms of the bonding strength, there is also a portion where an effective force is not transmitted as a seal. Rather, the bonding band 100
Are more effective in protecting the joint. EPDM foam (foam sheet 2) is solely responsible for the sealing performance. The wrapped portion of the EPDM foam is better adapted to its low rebound even when wrapped, and enhances the sealing effect.

In the embodiment shown in FIG.
C, a foam material 1D provided around the C, and a rubber paste 1B formed around the foam material 1D are shown. As the core 1C, a hard foam material or a solid rubber material was used, and as the foam material 1D, a material softer than the foam material 1A shown in FIGS. 1 and 2 was used. The filling member 1 has a sectional area 0.9 to 2 times larger than the sectional area of the valley 201.
It is calculated so as to be twice, preferably 1.1 to 1.5 times, and a part of the valley 201 is filled. When a hard foam material is used as the core 1C of the filling member 1, the density is 0.1 to 0.1.
4, JIS C hardness 5-40, or J
50% compression hardness in IS K6767 100 to 10
A closed cell or semi-closed cell satisfying the performance of 00 gf / cm ² is used. Foam material 1D around core 1C
Is within the range of 0.04 to 0.3, preferably 0.04 to 0.2, and has a JIS C hardness of 5
A closed-cell or semi-closed-cell foam that satisfies the performance of 100 to 1000 gf / cm ² in 50% compression hardness according to JIS K6767.

Each of the embodiments shown in FIG. 4 to FIG.
FIG. 6 shows an example in which the foam material 1D is not formed all around the core 1C, and the upper surface of the core 1C is not covered with the foam material 1D in FIG. In the filling member having the shape shown in FIG. 5, a foam material 1D around the core 1C has a low density and is easily compressed and deformed.

The filling member 1 has a cross-sectional shape of a valley 20.
A high-density material can be used when it substantially matches the cross-sectional shape of No. 1, but a low-density material having a rectangular cross-section is preferably used.

Preferably, a polyolefin-based sheet is adhered to the outer surface of the foam sheet 2. By adhering such a sheet, it is possible to prevent the foam sheet 2 from being damaged at the X locations shown in FIG. As such a polyolefin sheet, a sheet of polyethylene or polypropylene can be used.

Materials used for the foam materials 1A and 1D and the core 1C include CR (chloroprene rubber), NBR / PV
C (blend type rubber obtained by mixing partially crosslinked nitrile rubber with vinyl chloride resin), IIR (butyl rubber), EPDM (ethylene propylene rubber), NR (natural rubber), NR / SB (natural rubber / styrene butadiene rubber) ), Foamed rubber or PVC foam, styrene-based, urethane-based, olefin-based elastomers and the like can be used.

[0016]

As described above, according to the present invention, the rubber around the slightly hard foam material of closed cells or semi-closed cells along the valley between the chevron ribs located at a position narrower than the effective width of the band. The filling member formed with the paste is calculated so that the cross-sectional area thereof is 0.9 to 2 times, preferably 1.1 to 1.5 times the cross-sectional area of the valley between the chevron ribs, and is filled in a part of the valley. Then, a foam sheet, which has been paste-processed on the inner surface, is wound around the filling member so as to cover the filling member, and then band-bonded. The glue can be pressed against the wall of the valley to improve the sealing performance. In addition, by wrapping the filling member with a foam sheet that has been glued on the inner surface so as to cover the filling member, the filling member filled in the valley can be temporarily fixed, and then the foam sheet is tightened by the band-joining force. It deforms and increases the degree of adhesion of the filling member to the joint of the rubber paste, thereby improving the sealing performance. Sufficient sealing performance can be obtained only by manually winding the foam sheet.

In the case where the filling member is made of a hard foam material or a solid rubber material as a core, a soft foam material is provided around the core, and a rubber paste is formed around the foam material. It is suitable for filling in a particularly large valley, and the strength of the filling member can be improved. When a large fastening force due to band joining acts, the filling member needs to have a certain strength or more.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a preferred embodiment of the present invention.

FIG. 2 is a sectional view showing another embodiment.

FIG. 3 is a cross-sectional view illustrating an embodiment in which a core is provided in a filling member.

FIG. 4 is a sectional view showing a modification of FIG. 3;

FIG. 5 is a sectional view showing still another modification of FIG. 3;

FIG. 6 is a sectional view showing an example in which the upper surface of the core is not covered with a foam material or rubber paste.

FIG. 7 is a schematic perspective view of a joint.

FIG. 8 is a schematic diagram showing a chevron rib and a valley of a resin pipe.

FIG. 9 is a front view showing a conventional example.

FIG. 10 is an enlarged cross-sectional view of a joint flange portion of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Filling member 1A, 1D Foam material 1B Rubber glue 1C Core 2 Foam sheet 2A Glue processing 100 Joining band 101 Band 102, 103 Joining flange 200 Resin pipe 201 Valley 202 Angle-shaped rib

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F16L 21/06

Claims (6)

[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 in which rubber glue is formed around a slightly harder foam material of closed cells or semi-closed cells along a valley between the chevron ribs located at a narrower position, has a cross-sectional area smaller than that of the valley between the chevron ribs. The spiral shape is calculated so that it becomes 9 to 2 times, fills a part of the valley, and wraps and wraps a foam sheet whose inner surface is glued to cover the filling member, and then joins the band. Sealing method for resin tubes with chevron ribs. 2. A method for sealing a resin pipe in which a chevron rib is formed by continuously joining spirally formed resin pipes, joining the joint flanges at both ends thereof, and tightening the band to join the band. A hard foam material or solid rubber material is used as the core along the valley between the angled ribs located at a narrower position, and a soft foam material is provided around the core, and a filling member formed with rubber paste around the foam material is provided. It is calculated so that the cross-sectional area is 0.9 to 2 times the cross-sectional area between the valleys between the chevron ribs, fills a part of the valley, and wraps a foam sheet that has been glued on the inner surface to cover this filling member. A method of sealing a resin pipe having a spiral-shaped angled rib, which is performed by band bonding after lapping. 3. The core of the filling member has a density of 0.1 to 0.1.
0.4, a JIS C hardness of 5 to 40, or a 50% compression hardness of 100 to 100 in JIS K6767.
The method for sealing a resin tube having a spiral chevron rib according to claim 2, wherein a closed-cell or semi-closed-cell foam material satisfying a performance of 1000 gf / cm ² is used. 4. A foam material around a core of a filling member having a density within a range of 0.04 to 0.3 and JIS
C hardness 5 to 35 or 50 in JIS K6767
% Compression hardness of the resin tube having a helical chevron rib according to claim 2 or 3, characterized in that using a foam of closed cell or semi-closed cell satisfies the performance of 100~1000gf / cm ² Sealing method. 5. A foam sheet having a density of 0.04 to 0.04.
0.4, JIS C hardness 5-40, or JIS
50% compression hardness in K6767 100 to 1000
5. The method for sealing a resin pipe having a helical chevron rib according to claim 1, wherein a foam body satisfying the performance of gf / cm ² is used. 6. A polyolefin sheet is adhered to an outer surface of a foam sheet.
The method for sealing a resin tube having a helical chevron rib according to any one of the above.