JP2554245Y2 - Sealing material for concrete products - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing material for concrete products which seals a plurality of horizontally connected concrete box-shaped short cylinders in a watertight manner.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 6, a plurality of concrete box-shaped short cylinders 1 are connected in a horizontal direction, and as shown in FIGS. 9 attached to the sponge rubber S via butyl rubber 12 or FIG.
And a sealing member made of butyl rubber 12 containing sponge rubber S as shown in FIG.
The surface is sealed.

[0003] However, there is a problem that it is difficult to maintain the sealing function for a long period of time from the viewpoint of compression set and the like.

[0004]

The problem to be solved is that it is difficult for conventional sealing materials to maintain a long-term sealing function.

[0005]

According to a first aspect of the present invention, as shown in FIGS. 1 to 3, a rubber-like elastic body is extruded into a shape along the center line of a connecting end face 1a of a short box-shaped concrete cylinder 1. An anchor 2 comprising a molded annular strip 2 which is embedded along the center line of the connecting end surface 1a when the short tubular body 1 is formed.
A pair of seal lips 2b, 2b are branched and projected in a Y-shape from both ends in the width direction of the connecting end surface 1a of the short cylindrical body 1 from the front end of the short cylindrical body 1,
Further, between the seal lips 2b, 2b and the anchor 2a
At the position where the connection end surfaces 1a, 1a of the adjacent short cylinders 1, 1 are drawn together for connection, the projection 2c is projected to the opposite side to the connection short surface 1a of the opposing short cylinder 1, The seal lips 2b, 2b abut on the projection 2c at three points.

In the second invention, in addition to the structure of the first invention, as shown in FIG. 4, the outer surfaces of the sealing lips 2b, 2b are covered with a film T made of ethylene tetrafluoride or polyethylene. , 2b and a notch N formed near the anchor 2a.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the first invention will be described with reference to FIGS. 1 to 3, 5 and 6, wherein 1 is a plurality of concrete box-shaped short cylinders connected in the horizontal direction, and 1a is the short cylinder thereof. The connecting end face 2 of the body 1 is a ring-shaped strip formed by extruding a rubber-like elastic body into a shape along the center line of the connecting end face 1a of the box-shaped short tubular body 1, and the connecting end face 1a is formed when the short tubular body 1 is formed. A pair of seal lips 2b, 2b are attached to both ends in the width direction of the connecting end face 1a of the short cylinder 1 from the tip of the anchor 2a embedded along the center line.
Branch lip in the shape of a letter, and furthermore, both seal lips 2b, 2b
A projection 2c is formed between the short cylinders 1 and 1 on the opposite side to the anchor 2a. The two seal lips 2b, 2b abut on the projection 2c at three points.

In the second invention, in addition to the structure of the first invention, as shown in FIG. 4, the outer surfaces of the sealing lips 2b, 2b are covered with a film T of ethylene tetrafluoride or polyethylene, and the sealing lip 2b , 2b and a notch N formed near the anchor 2a.

The operation will be described. As shown in FIG. 1, before the short cylinder 1 is connected, the two seal lips 2b, 2b branch and project in a Y-shape on both sides in the width direction of the connection end surface 1a of the short cylinder 1. However, when the connecting short surface 1a of the adjacent short cylinder 1 is pulled and connected, it is pushed down as shown in FIG. Therefore, the load applied to the seal lips 2b, 2b is remarkably reduced as compared with the conventional one, and the sealing function is maintained for a long time.

[0010] In a second aspect of the present invention, as shown in Fig. 4, the connecting short surface 1a of the short cylindrical body 1 with which the sealing lips 2b and 2b face each other.
Abuts with the connecting short surface 1a of the opposite short cylinder body 1 because it is easy to open due to the notch N through the film T made of ethylene tetrafluoride or polyethylene having a small coefficient of friction. The load applied to the lips 2b, 2b is dispersed over a wide range to prevent an excessive load from being applied locally, and the sealing function is maintained for a longer period.

[0011]

[Effect of the Invention] Since the present invention is configured as described above,
The seal lips 2b, 2b abut on the connecting short surface 1a of the adjacent short cylindrical body 1 at the three ends of the front end portions on both sides and the projections 2c, so that the load applied to the seal lips 2b, 2b is dispersed,
It is significantly smaller than the conventional one, and the sealing function is maintained for a long time.

[Brief description of the drawings]

FIG. 1 is a sectional view taken along the line AA of FIG. 5, showing a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG. 5 showing a state before construction of the first embodiment of the present invention.

FIG. 3 is a cross-sectional view taken along the line AA of FIG. 5, showing a state after construction of the first embodiment of the present invention.

FIG. 4 is a sectional view taken along the line AA of FIG. 5, showing a state before construction of the second embodiment of the present invention.

FIG. 5 is a BB diagram of FIG. 6 showing a concrete box-shaped short cylinder.
It is a partial sectional view.

FIG. 6 is a perspective view of a plurality of short box-shaped concrete cylinders.

FIG. 7 is a sectional view taken along the line AA of FIG. 5, showing a state before construction of Conventional Example 1.

FIG. 8 is a sectional view taken along the line AA of FIG. 5, showing a state after construction of Conventional Example 1.

FIG. 9 is a sectional view taken along the line AA of FIG. 5, showing a state before construction of Conventional Example 2.

FIG. 10 is a view showing a state after the construction of the conventional example 2 taken along the line AA in FIG. 5;
It is sectional drawing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Short box body made of concrete 1a Connection end surface 2 Annular strip 2a Anchor 2b Seal lip 2c Projection 12 Butyl rubber N Notch S Sponge rubber T Film of tetrafluoroethylene, polyethylene, etc.

Continuing on the front page (72) Inventor Keisuke Kawahara 1351 Uefu, Shingu-cho, Kasuya-gun, Fukuoka Pref. (JP, U) Japanese Utility Model Hei 2-58075 (JP, U) Japanese Utility Model Application Showa 60-195373 (JP, U)

Claims (2)

(57) [Scope of request for utility model registration] 1. A ring-shaped strip (2) formed by extruding a rubber-like elastic body into a shape along the center line of a connecting end surface (1a) of a concrete box-shaped short cylinder (1). 2)
Are a pair of seals from the tip of the anchor (2a) buried along the center line of the connecting end face (1a) at the time of molding the short cylindrical body (1) to both sides in the width direction of the connecting end face (1a) of the short cylindrical body (1). The lips (2b, 2b) are branched and protruded in a Y-shape, and the lips (2b, 2b) are further provided between the sealing lips (2b, 2b) and the anchor (2b).
a) Ri Na is protruded projections (2c) on the side opposite to the adjacent
The connecting end surface (1a, 1a) of the short cylindrical body (1, 1)
In the connected position, the short cylinder (1)
End face (1a), both seal lips (2b, 2b) and projection
Concrete products sealing material for you contact at three points (2c). 2. An outer surface of the sealing lip (2b, 2b) is coated with a film (T) of ethylene tetrafluoride or polyethylene, and also on an inner surface of the sealing lip (2b, 2b) and near the anchor (2a). The sealing material for concrete products according to claim 1, wherein a notch (N) is formed.