JPH0514777U - Rubber ring for pipe joint seal with rib - Google Patents

Abstract

(57) [Summary] [Purpose] A ribbed tube that maintains the cross-sectional area and hardness of the rubber ring as it is to ensure sufficient waterproofness, and that can be easily expanded in diameter to ensure good mounting workability. A rubber ring for joining seal is provided. A rubber ring that is compressed between an inter-rib annular groove of a ribbed pipe insertion port having an annular rib on the outer surface and a pipe receiving port,
It is characterized in that the inner peripheral surface in contact with the bottom surface of the inter-rib annular groove is provided with a large number of cuts perpendicular to the circumferential direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rubber ring for a pipe joining seal with ribs, which is used when a pipe with ribs having a large number of annular ribs at predetermined intervals is joined to the outer surface by a receiving / inserting method via a rubber ring. is there.

[0002]

[Prior Art]

 As underground pipes such as sewage pipes, there may be used synthetic resin pipes with ribs that form a large number of annular ribs on the outer surface at predetermined intervals. As shown in FIG. 3, a rubber ring 5'is attached to the inter-rib annular groove 20 'of the pipe insertion port 4', and then the rubber ring attachment pipe insertion port 4'is inserted into the pipe receiving port 3'and the rubber ring 5'is inserted. 'Is compressed on the inner surface of the port 3'.

In this case, the waterproofness of the joint depends on the compression reaction force of the rubber ring 5 ′. If this compression reaction force is insufficient, a water leakage accident cannot be avoided, and the thickness of the rubber ring 5 ′ is usually set between the ribs. It is necessary to make the cross-sectional area of the rubber ring 5 ′ considerably large by setting the depth of the annular groove 20 ′ to 1.2 to 1.5 times.

[0004]

[Problems to be solved by the device]

 To attach the rubber ring 5'to the inter-rib annular groove 20 'in the pipe insertion port 4', it is necessary to expand the diameter of the rubber ring 5'to overcome the annular rib 2 '. Since the cross-section area of the rubber ring 5'is large, a large circumferential tensile reaction force acts on the diameter expansion, and it is difficult to expand the diameter of the rubber ring 5'by hand.

However, in civil engineering works such as sewer pipe work, a standard length pipe (for example, 4 m) of the product is required according to the distance between the pipe laid up before the manhole and the manhole. It is necessary to cut it to length and to join this cutting pipe with the above-mentioned laying pipe. In this case, it is necessary to install a rubber ring on the site, and as described above, the diameter of the rubber ring becomes large. If force is required, the installation work becomes very troublesome, and if the rubber ring is forcibly installed, water leakage accidents due to damage to the pipe, twisting of the rubber ring, or other damage are often unavoidable. .

[0006] In the above, if the hardness of the rubber ring is lowered in order to facilitate the mounting of the rubber ring or the cross-sectional area of the rubber ring is simply reduced, the compression repulsion force of the rubber ring becomes insufficient, and the waterproofing is stopped. A decline in sex is unavoidable.

The object of the present invention is to provide a ribbed tube that maintains the cross-sectional area and hardness of the rubber ring as it is to ensure sufficient water-stopping property and can easily expand the diameter to ensure good mounting workability. It is to provide a rubber ring for a joint seal.

[0008]

[Means for Solving the Problems]

 A rubber ring for a pipe joint seal with ribs according to the present invention is a rubber ring which is compressed between an annular groove between ribs of a ribbed tube insertion port having an annular rib on the outer surface and a pipe receiving port. This structure is characterized in that a large number of cuts are formed on the inner peripheral surface in contact with the bottom surface in a direction perpendicular to the peripheral direction.

[0009]

[Action]

 When a circumferential tensile force is applied to a rubber ring, the cross-sectional area of the rubber ring where tensile stress acts on this tensile force is substantially reduced due to the notch on the inner surface side. Since the tensile stress at and becomes large and the rubber ring expands to that extent, the rubber ring can be sufficiently expanded even with a relatively low circumferential tensile force, and the rubber ring can be easily mounted in the annular groove between the ribs.

Further, with respect to the compression of the rubber ring by the inner surface of the pipe receiving port, since the cross-sectional area of the rubber ring can be substantially maintained, a sufficient compression reaction force can be generated, and excellent water stopping performance can be guaranteed.

[0011]

Embodiments Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 (a) is a vertical cross-sectional view of an embodiment of the present invention, showing a state in which the embodiment product is mounted in the annular groove between ribs of the ribbed pipe insertion opening, and the pipe insertion opening is still inserted into the pipe receiving opening. Not yet done.

FIG. 1B is a cross-sectional view taken along the line of FIG. 1A. In (a) and (b) of FIG. 1, 1 is a rib-equipped synthetic resin pipe having a large number of annular ribs 2, ... At predetermined intervals on its outer surface, 3 is a pipe receiving port, 4 is a pipe insertion port, Reference numerals 5 denote the rubber rings of the present invention, and the rubber rings 5 are mounted in the inter-rib annular groove 20.

Reference numeral 51 denotes a seal portion provided on the outer periphery of the rubber ring, which is projected in a mountain shape. Reference numerals 52 and 52 denote seal portions provided on both sides of the rubber ring at positions near the outer periphery of the rubber ring, and have a pleated shape having a lip seal action. Denoted by 53, ... are notches formed in the inner peripheral surface of the rubber ring in a direction perpendicular to the circumferential direction thereof, and reach just below the side surface seal portion 52.

The portion 50 having the notches 53, ... Functions as a ground portion of the rubber ring for a seal, and the width thereof is substantially equal to the width of the inter-rib annular groove 20. The thickness of the rubber ring 5 is 1.2 to 1.5 times the depth of the inter-rib annular groove 20, and the inner diameter of the rubber ring 5 is 0. It is set to 95 times to 1.0 times. The number of the above-mentioned notches 53 varies depending on the inner diameter of the rubber ring 5, but is usually 30 to 100.

In FIG. 1A, when the rubber ring 5 is mounted in the inter-rib annular groove 20, the rubber ring 5 is passed over several annular ribs 2, while maintaining its expanded state. It is necessary to fit it in the inter-rib annular groove 20 at a predetermined position. However, at the cut portion 53, there is no effect of tensile stress on the above-mentioned radial expansion tensile force in the cross-sectional area portion up to the cut depth, and the remaining small breakage. Since the entire area expanding tensile force is borne by the area portion, the tensile stress becomes large and the rubber ring 5 is stretched as much under the same expanding tensile force, so that the diameter expanding can be easily performed.

In FIG. 1A, when the pipe insertion port 4 is inserted into the pipe receiving port 3, the rubber ring 5 is compressed by the inner surface of the pipe receiving port 3 in the thickness direction, and the Poisson's ratio deformation is caused by the compression. It is also deformed in the pipe axis direction, and the seal portion 51 on the outer peripheral surface of the rubber ring and the inner surface of the pipe receiving port 3 are arranged side by side with the seal portion 52 on the side surface of the rubber ring and the inner surface of the inter-rib annular groove 20. The space is compressed with sufficient compression force.

The compressive stress is determined by the ratio of the width of the gland portion of the rubber ring to the width of the annular groove between the ribs and the ratio of the thickness of the rubber ring to the gap size between the pipe insertion port and the pipe receiving port. Since the gland portion 50 of the rubber ring 5 can be sufficiently compressed even in the presence of the above, the seal portion 51 on the outer peripheral surface of the rubber ring and the inner surface of the pipe receiving port 3 and the seal portion 52 on the side surface of the rubber ring are provided. A sufficient compressive stress can be applied between the inner surface of the inter-rib annular groove 20 and a sufficient water pressure can be ensured.

As the material of the rubber ring 5, styrene / butadiene rubber (SBR), chloroprene rubber (CR), ethylene / propylene rubber (EPR), natural rubber (NR) or the like can be used.

In order to manufacture the rubber ring 5, a rubber ring without a notch is formed by injection or pressurizing, and after the forming, a notch is formed by machining, (a) of FIG. 2 and FIG. (B) [Side view of FIG. 2 (a)], the inner and outer reversals have seal portions 51 and 52, 52 on the inner side, and notch gaps 530, ... on the outer side, respectively. It is possible to use a method in which a rubber ring is molded by injection or pressurizing, and the inner and outer surfaces are reversed when mounted on the tube insertion port.

According to the latter method, even if there is a relatively large gap at the cut before reversing, the gap at the notch can be made small by reversing when mounting, so the rubber ring similar to the former method can be used. The compressive repulsion force can be increased, and the thickness of the notch forming protrusion of the mold can be made sufficiently thick, so that the mold strength can be well guaranteed.

In the embodiment shown in (a) and (b) of FIG. 1 above, water is stopped between the pipe insertion port 4 and the rubber ring 5 also by the seal portion 52 on the side surface of the rubber ring. Under compression of the rubber ring 5, even if a gap is left at the cut portion 53, the waterproofness can be sufficiently retained.

In contrast to the above embodiment, the seal portion 52 on the side surface of the rubber ring may be provided on only one side surface. In the above, if the compression ratio of the rubber ring is increased, it is possible to completely prevent the remaining of the gap of the notch 53 under the compression of the rubber ring and to strongly press the faces of the gap strongly. In this case, It is also possible to omit the pleated seal 52 on the side.

[0023]

[Effect of the device]

 The rubber ring for a pipe joint seal with ribs of the present invention is constructed as described above, and since the diameter expansion is easy, it can be easily mounted in the annular groove between the ribs of the ribbed pipe, and it is sufficiently compressed. Since the repulsive force can be generated, sufficient waterproofness can be guaranteed. Therefore, according to the present invention, it is possible to easily join the ribbed pipes by the receiving / inserting method and with excellent waterproofness.

[Brief description of drawings]

FIG. 1 (a) is a partial vertical cross-sectional view of a use state of an embodiment of the present invention, and FIG. 1 (b) is a sectional view of FIG. 1 (a).
FIG.

2 (a) is a partial vertical cross-sectional view of the example product shown in FIG. 1 immediately after molding, in which the inner and outer peripheral surfaces are reversed with respect to the example product. 2B is a partial side view of FIG.

FIG. 3 is a vertical cross-sectional view showing a joint portion of a ribbed tube by a receiving / inserting method.

[Explanation of symbols]

 1 Pipe with rib 2 Annular rib 20 Annular groove between ribs 3 Pipe receiving port 4 Pipe insertion port 5 Rubber ring 51 Seal part 52 Seal part 53 Notch

Claims (1)

[Scope of utility model registration request] 1. A rubber ring which is compressed between an inter-rib annular groove of a ribbed tube insertion opening having an annular rib on its outer surface and a tube receiving opening, the inner ring surface being in contact with the bottom surface of the inter-rib annular groove. A rubber ring for a pipe joint seal with ribs, characterized in that a number of cuts are provided at right angles to the circumferential direction.