JPH08109985A - Rubber seal member for concrete pipe coupling part - Google Patents

Abstract

PURPOSE: To facilitate the fitting work of the coupling part of a concrete pipe and prevent the water leak. CONSTITUTION: A ring-shaped rubber seal member 1 which is fitted with the projection part having a taper surface on the projection side of an unevenly fitted coupling part of a concrete pipe is formed to a nearly L-shaped section, and at the end part on the starting-up side of a core part 2 consisting of a solid rubber member 2, the Y-shaped first lip part 3 and an arrowhead-shaped part 4 at the horizontally directed side end part of the core part 2 are formed. Further, the inside and outside surfaces between the first lip part 3 of the core part 2 and the arrowhead-shaped part 4, are covered by the water-swelled sponge rubbers 5, and further, the second lip part 6 is formed on the water- swelled sponge rubber part 5 on the horizontally directed side on the outer surface side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ring-shaped rubber seal member used in a concrete pipe joint.

[0002]

2. Description of the Related Art A conventional rubber seal member of this type is shown in FIG.
As shown in Fig. 4A, the concrete pipe is fitted into the projection T on the convex side of the joint J that is fitted in the concavo-convex shape, and the sectional shape is shown in Fig. 4A.
Solid rubber simple substance 7 or 8 as shown in FIG. 5B, water-expanded solid rubber single substance 9 as shown in FIGS. 5A and 5B, or a hybrid of water-expanded solid rubber and solid rubber There are ten.

[0003]

However, at the time of concavo-convex fitting of the concrete pipe joint portion J, the above-mentioned conventional rubber seal members 7 to 10 have relatively large hardness and thrust force in the fitting direction shown by the arrow A in FIG. Because of the structure of the member, the entire thickness width H shown in FIGS. 4 and 5 is applied, so that the resistance at the time of fitting becomes extremely large, and the fitting work becomes difficult. Further, as shown in FIG. 8, a bolt B fastening method is required. Further, since the rubber seal member S has a space which is fitted only to the tapered portion t of the joint portion J projection portion T and is not sealed to the vertical end face portion E, a shift Z is likely to occur due to the inclination K at the time of fitting as shown in FIG. However, there was a problem that water leakage occurred from the side where it was greatly revealed. Therefore, in view of the conventional problems, it is an object of the present invention to provide a rubber seal member for a concrete pipe joint which facilitates fitting work of the joint and prevents water leakage.

[0004]

In order to achieve such an object, the structure of the present invention is, as shown in FIG. 1, a projection having a tapered surface t on the convex side of a joint portion J of a concrete pipe into which projections and recesses are fitted. The ring-shaped rubber seal member 1 fitted in the portion T is
A Y-shaped first lip portion 3 and a barbed portion 4 are formed on the rising side end of the core 2 made of a solid rubber material and having a substantially L-shaped cross section, and on the lateral side end of the core 2. The inner and outer surfaces of the core portion 2 between the first lip portion 3 and the barbed portion 4 are covered with a water-expandable sponge rubber portion 5, and the water-expandable sponge rubber on the outer surface side and the lateral side is further formed. The second lip portion 6 is formed on the portion 5.

[0005]

Embodiments of the present invention will now be described in detail with reference to the drawings. In FIG. 1, reference numeral 1 denotes a ring-shaped rubber seal member having a substantially L-shaped cross section, which is fitted to a protruding portion T having a tapered surface t on the convex side of a joint portion J of a concrete pipe to be recessed and fitted shown in FIG. It is what is done. The rubber seal member 1 has a Y-shaped first lip portion 3 and a barbed portion 4 formed at a lateral side end portion of a core material 2 made of solid rubber at a rising side end portion and a barbed portion 3 at the side end portion. The water-expanded sponge rubber portion 5 is coated on both the inner and outer surfaces between the water-filled portion 4 and the groove 4. Further, a second lip portion 6 is projectingly provided on the outer surface side and the lateral side of the water-expanded sponge rubber portion 5.

However, when the concrete pipe on the concave side of the joint portion J is fitted into the concave and convex portions by the thrust in the direction of the arrow A as shown in FIG. 2, the intervening rubber seal member 1 has a highly flexible water-expandable sponge rubber portion 5. Since it is received at, the contact is weak and the fitting work becomes easy. Further, unlike the conventional case, the sealing range extends not only to the tapered surface t of the projection T but also to the vertical end surface E, so that the first lip portion 3 abuts on the vertical end surface E and the second lip on the tapered surface t. The part 6 abuts. Therefore, the sealing property is improved, and even if the fitting portion is largely displaced Z due to the variation in the force during the fitting work, as shown in FIG. 3, those forces are applied to the first and second lip portions 3 and 6.
Each of them can be absorbed to prevent deviation. Further, by using a water-expandable sponge rubber that expands with water, it is possible to reliably prevent water leakage from a small gap.

[0007]

As described above, since the rubber seal member of the concrete pipe joint portion of the present invention is formed in a substantially L-shaped cross section, not only the projection portion of the joint portion but also the vertical end face portion as in the conventional case is formed. Can be contacted with each other, the sealing property is improved, and even if there are variations in the force during the fitting work, they are absorbed and it is possible to prevent the fitting part from being largely displaced.

[Brief description of drawings]

FIG. 1 is a sectional view of a rubber seal member of a concrete pipe joint portion of the present invention.

FIG. 2 is a cross-sectional view showing a state in which the same rubber seal member is fitted in the joint portion.

FIG. 3 is a cross-sectional view showing a state in which the same joint portion is largely displaced.

4 (a) and 4 (b) are sectional views of a conventional rubber seal member of a concrete pipe joint.

5 (a) and 5 (b) are sectional views of another rubber seal member of the above.

FIG. 6 is a side view showing a state in which a conventional rubber seal member is fitted in a joint portion.

FIG. 7 is a side view showing a state in which uneven fitting of the joint portion is largely deviated.

FIG. 8 is a side view showing a state of a conventional joint portion bolt fastening method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 rubber seal member 2 core material 3 first lip portion 4 arrowhead portion 5 water-expandable sponge rubber portion 6 second lip portion A arrow E vertical end face portion J joint portion T projection portion t tapered surface

Claims (1)

[Claims] 1. A ring-shaped rubber seal member, which is fitted to a protrusion having a tapered surface on the convex side of a joint portion of a concrete pipe into which concave and convex portions are fitted, is formed into a substantially L-shaped cross section and is made of a solid rubber material. A Y-shaped first lip portion is formed at the rising end of the core portion, and a barbed portion is formed at the lateral side end portion of the core portion, and the first lip portion and the barbed portion of the core portion are formed. A rubber seal member for a concrete pipe joint portion, characterized in that both the inner and outer surfaces of the space are covered with a water-expandable sponge rubber portion, and further a second lip portion is formed on the outer surface side and the laterally-expanded water-expandable sponge rubber portion.