JPS5923046Y2 - road expansion joint device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a road expansion joint member used for joints of expressways and other viaducts.

On expressways and other viaducts, joint spacing is provided for each unit length of the roadbed to absorb expansion and contraction of the roadbed due to temperature changes in the climate, but expansion joints are usually used for these joint spacings, which can cause obstructions to vehicle traffic. This also prevents damage to the roadbed, such as chipping of the end face of the roadbed.

Recently, elastic materials such as synthetic rubber (chloroprene type, etc.), which have good elasticity and watertightness, have been frequently used for such joint members.

However, joint members made of this type of elastic material have the disadvantage that they are susceptible to abrasion from vehicles and the like, and their surfaces wear out relatively quickly.

The present invention solves the above-mentioned drawbacks of joint members made of elastic bodies, and is characterized by forming a special wear-resistant layer on the surface layer.

The following description will be made based on the illustrated embodiment.

FIG. 1A shows a cross section of the expansion joint device 1 at the joint interval between the unit roadbeds 2, 2, and the expansion joint member, generally indicated by the symbol 5, is provided with a wear-resistant layer 6 on the surface layer.

The expansion joint member 5 is fixed to opposite end portions of the roadbed by anchors 3, 3'' on both sides, spanning the joint interval between the unit roadbeds.

It goes without saying that this expansion joint member 5 has a predetermined length smaller than the length of the joint interval, and can be used singly or in a plurality of pieces joined together.

The expansion joint device 1 shown in FIG. 1 is basically the same as that shown in FIG.

Now, as shown in FIG. 2, the expansion joint member 5 of the present invention has a cross section consisting of a base layer 4 and a wear-resistant layer 6 integrally molded thereon, and the wear-resistant layer 6 further includes an upper layer 7 and a lower layer. It consists of 8.

The base layer is formed of an elastic material such as vulcanized natural rubber or chloroprene rubber, and the upper layer 7 of the wear-resistant layer 6 is made of a similar elastic material with woven or knitted fabric parallel to the upper surface and covering the entire surface. The lower layer 8 has a structure in which fiber flocks are evenly mixed into a similar elastic body.

These layers 4, 8.7 are formed integrally or separately from the beginning of molding, and then integrally molded under pressure using an adhesive or the like.

The structure of FIG. 3 is similar to that of FIG. 2, but the layer 7 (upper layer) in which woven or knitted fabric is embedded is also arranged in the flock layer of the lower layer 8 in two stages.

With the above configuration, the upper surface of the base layer 4, which forms the main body of the expansion joint member 5, is protected by the wear-resistant layer.

Since the upper layer 7 of the wear-resistant layer 6 is embedded with woven or knitted fabric, it has strong resistance to the force that acts to tear it along the surface, and the surface layer 7 due to such force when the wheel passes through it. Fatigue of the elastic body is suppressed, and the flock layer in the lower layer 8 maintains the cushioning properties of the elastic body while resisting forces in all directions due to the flock mixed in, which alleviates the deformation fatigue of the elastic body due to the load when the vehicle passes through it. .

At this time, it is preferable to use the layer 7 in which woven or knitted fabric is embedded as the upper layer in view of the effect when the vehicle passes through.

The operation and effect of the one in Fig. 3 is almost the same, but when the expansion joint member becomes larger in both width and length and the area of the upper surface becomes larger, the third It is preferable to have a two-layer structure as shown in the figure.

In this way, the fatigue of the elastic body, which is the main material constituting the expansion joint member 5, is alleviated, and the wear resistance effect is increased, especially in the surface layer portion.

The results of a wear loss test on the expansion joint member of the present invention are as follows.

In general, it is difficult to measure and evaluate the loss of wear due to rubber.
The test was carried out by mounting on JISG 3101.2 class 5S-41 material under a constant pressure and measuring the amount of wear due to a constant number of sliding frictions.

■ Conventional road expansion joint device 100 (unreinforced) ■ Approximately 20 as shown in Figure 2 Approximately 25 as shown in Figure 3 As described above, the wear resistance of the expansion joint member of the present invention is superior to that of conventional elasticity. This is 4 to 5 times that of a joint member.

[Brief explanation of the drawing]

Figure 1A is a sectional view, Figure 1 is a sectional view of another embodiment, Figure 2 is a sectional view showing the basic structure of a joint member, and Figure 3 is a sectional view showing the basic structure of another embodiment. . 1... Expansion joint device, 2... Unit roadbed, 3... Anchor, 4... Base layer, 5...
...Expansion joint member, 6...Wear-resistant layer, 7
...Top layer, 8...Bottom layer.

Claims (1)

[Claims for Utility Model Registration] An expansion joint member having a width spanning the interval between joints and a predetermined length shorter than the length of the joint, the cross-sectional structure of which includes a base layer made of an elastic body and an upper surface thereof. An expansion joint member characterized in that the wear-resistant layer is further composed of an upper layer in which woven or knitted fabric is embedded in an elastic body and a lower layer in which fiber flock is mixed. .