JPH0139761Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an expansion joint for a bridge. Conventionally, expansion joints for bridges have had expansion grooves on the top of the main body, which could become clogged with pebbles, impairing expansion and contraction, and accelerating wear and tear, resulting in a lack of durable use. In order to eliminate this drawback, the present invention embeds a rigid substrate with a stretchable groove in the center of the back surface in an elastic stretchable member to increase its strength against pressure from the top surface. A stop groove is provided to prevent slipping.

An embodiment of the present invention will now be described with reference to the drawings.

In the figure, 1 is an elastic elastic member. 2, 2 has a vertically rising piece a at one end and an inclined rising piece b with a through hole c at the other end, bends the extended part horizontally, overlaps this part vertically, and has an expansion groove in the center of the back side. A pair of rigid substrates 4 are formed, and by providing empty chambers 3, 3 on the extension of their tips, the rigid substrates 2, 2 can be expanded and contracted from side to side within the elastic extensible member 1 without receiving large resistance. ing. This rigid substrate 2, 2
As shown in FIG. 2 of the drawings, the bottom surfaces of the bases d, d between the vertically rising piece a and the inclined rising piece b are exposed from the elastic elastic member 1 and buried, or as shown in FIG. 3 of the drawings. There are two ways of use: embedding in the elastic elastic member 1;

In the former case, through holes c...c are formed at intervals in the inclined rising piece b of the rigid substrate 2, and the elastic elastic members 1 on the upper and lower sides of the rigid substrates 2, 2 are integrated. There is.

Numerals 6, 6, . . . 6 are several thin and shallow anti-slip grooves provided at intervals on the upper surface of the elastic elastic member 1. 7,7…7
are screw holes, which are provided at intervals on both sides of the elastic elastic member 1, and mounting screw holes 8 are formed in the base d of the rigid substrate 2 exposed at the bottom of the screw holes 7, 7...7, respectively. There is. Incidentally, FIG. 4 shows the construction state of the product of the present invention, in which numeral 9 indicates an anchor bolt buried in the bridge girder 10, and numeral 11 indicates a tightening nut.

Since the present invention is constructed as described above, if the present invention is installed between the bridge girders 10 and 10 as shown in Figure 4 of the drawing, it will be able to cope with the expansion and contraction caused by vibrations and temperature changes of the bridge. The elastic extensible member 1 expands and contracts as the substrate 2 slides.

Since the expansion joint for bridges of the present invention has an expansion groove provided in the center of the back surface of the rigid substrate, there is no possibility that stones, dirt, etc. will become clogged with it and deteriorate the elasticity or accelerate wear. The rigid substrate is embedded over almost the entire width in the elastic extensible member, and since the empty chambers 3, 3 are provided on the extension of the rigid substrates 2, 2, the rigid substrates 2, 2 are buried in the elastic extensible member 1. Since it can be moved from side to side without experiencing significant internal resistance, it can be used for a long period of time without getting damaged. Furthermore, since several anti-slip grooves are provided on the top surface, there is no risk of slipping for passersby or passing vehicles.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the product of the present invention, showing a continuous body with the center cut out. Figure 2 is a sectional view of the same as above. FIG. 3 is a sectional view showing another embodiment. FIG. 4 is a sectional view showing an example of construction of the product of the present invention. In the figure, 1 is an elastic elastic member. 2 is a rigid board. Room 3 is vacant. 4 is an expansion groove. 6 is a non-slip groove.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A vertically rising piece is provided at one end and an inclined rising piece with a through hole is provided at the other end, the extensions of which are bent horizontally and stacked one on top of the other, and the central part of the back surface An expansion joint for a bridge, in which a pair of rigid substrates with expansion grooves formed therein are embedded in an elastic expansion and contraction member, a vacant chamber is provided on the extension of the tip of the rigid substrate, and screw holes are provided at intervals on both sides. (2) The expansion joint for a bridge according to claim 1, which is a utility model registered claim, wherein several anti-slip grooves are provided at intervals on the upper surface of an elastic member covering a rigid member.