JPS63156103A - Expansion joint - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an expansion joint used for connecting bridges such as road bridges.

[Conventional technology]

Conventionally, various types of expansion joints of this type have been devised, but most of these are installed at right angles to the axial direction of the road bridge, that is, in the lateral direction. That is, as shown in Fig. 3, the expansion joint (1) connects the adjacent road bridge (
2), the vehicle passes over it orthogonally to the expansion joint (1).

Incidentally, in recent years, there have been many cases in which the road width of existing road bridges is expanded or when highways are constructed to connect main road G or rampways, and in these cases, expansion joints are used to connect road bridges. It is necessary to install it on the side edge along the bridge axis direction. Figure 4 shows a case where the road width is expanded. A road bridge (4) for widening is installed on one side edge of the existing road bridge (3), and an expansion joint (5) is installed between them. Such a vertically installed expansion joint (5) requires different performance and characteristics from a horizontally installed expansion joint (1). At the lateral expansion joint (1), the time during which the weight of the vehicle acts directly is very short, and at the road bridge (2)
The force acting on the expansion joint (1) due to expansion and contraction due to temperature changes is mostly only a force in a direction perpendicular to the expansion joint (1).

On the other hand, when the expansion joint (5) is installed in the longitudinal direction, the vehicle almost never crosses the expansion joint (5) at right angles, but runs diagonally across or parallel to it. Therefore, not only is the time that the weight of the vehicle directly acts on the expansion joint (5) relatively long and a large force acts on the expansion joint (5), but the way in which it acts is also very different from that of the lateral expansion joint (1). It will be different. In addition, road bridges (3
) (4) The force acting due to the displacement of the expansion joint (5)
The shear force is parallel to the longitudinal direction, the bending force is perpendicular to the longitudinal direction, and the compression/tensile force is perpendicular to the horizontal direction, and this point is also completely different from the lateral expansion joint (1).

Even though the performance and characteristics required of expansion joints are very different, conventionally, even when installing an expansion joint in the vertical direction, the existing expansion joint that should be installed in the horizontal direction can be used as is. Was. As a result, they often break due to insufficient strength, and even if they do not break, their lifespan is short and there are problems with durability.

[Problem that the invention seeks to solve]

This invention was made in view of the above circumstances, and its purpose is to provide a structure that can be installed between the side edges of a road bridge along the axial direction, withstands large relative displacements, and is durable. Our goal is to provide excellent expansion joints.

Another object of the present invention is to provide an expansion joint that has a simple structure, is replaceable, and is easy to install and replace.

[Means for solving problems]

In this invention, a pair of base plates (22) each fixed to adjacent side edges of two bridges that are connected to each other, an elastic member (28) installed between the pair of base plates (22), Rigid cover plate 1 that is slidably supported by the pair of base plates (22) via elastic support members (25) fixed to each of the base plates (22) and covers the gap between both base plates (22). - (27) is provided. The base plate (22) has a horizontal portion (22a), a hanging portion (22b) formed downward on one side edge thereof, and an upstanding portion (22c) formed upward on the other side edge. There is.

The support member (25) is provided in the horizontal part (22a) and the upright part (22c), and the horizontal part (22a)
The cover plate (27) is slidably supported by the portion located at the erected portion (22c), and the portion located at the upright portion (22c) is brought into contact with the side edge of the cover plate (27).

The elastic member (28) is connected to the pair of hanging parts (22b).
One end is fixed to each, and the cover plate (27) is connected to the cover plate (27) approximately at the center thereof.

[Effect]

A pair of base plays 1- (22) interconnecting 2
Since the rigid cover plate (27) is fixed to the adjacent side edges of two bridges and covers the gap between both base plates (22), the gap between the both side edges is closed and the vehicle There will be no hindrance to traffic between the two.

Furthermore, when a relative displacement occurs in the axial direction of the bridge, the elastic member (28) deforms in the same direction, thereby preventing the action of shearing force. Also, at this time, the bridge and cover plate (
27) is also subjected to a relative displacement, but this displacement is easily carried out since the cover plate (27) is slidable on the support member (25).

When a relative displacement occurs in the horizontal direction perpendicular to the bridge axis direction of the bridge, the elastic member (28) is tensed or compressed and deforms,
It is possible to prevent the effects of compressive and tensile forces. at the same time,
When compressed, the portion of the support member (25) on the upright portion (22c) deforms, and when tensioned, the cover plate (27) deforms.
can slide on the support member (25) to absorb the displacement. Therefore, no large force acts on the cover plate (27).

Furthermore, when a relative displacement occurs in the circumferential direction around the bridge axis of the bridge, the action of bending force can be prevented by upward or downward curving deformation of the elastic member (28). The relative displacement between the cover plate (27) and the base plate (22) that occurs at this time is absorbed by the deformation of the support member (25) and the sliding of the cover plate (27) on the support member (25).

In addition, since the cover plate (27) is connected to the elastic member (28), the supporting member (
25) [Embodiments] Hereinafter, embodiments of the present invention will be described based on the attached drawings.

Figures 1 and 2 show the expansion joint according to the present invention installed, where (11) is an existing road bridge, (12) is an existing road bridge;
) is a road bridge for widening. The road bridge (11) has support pads (14) on the upper end surfaces of a plurality of piers (13) installed in parallel.
A girder (15) is installed through the girder (15), and a support pad (16) is installed on the upper end surface of the girder (15).

Similarly, for the road bridge (12), girders (19) are attached via support pads (18) to the upper end surfaces of a plurality of piers (17) arranged in parallel near the side edges of the road bridge (11). is installed on the upper end surface of this girder (19) via a support pad (20).

An expansion joint (21) according to the present invention is installed between the adjacent side edges of the two road bridges (11) and (12), and this expansion joint (21) has the structure described below. It is.

(22) is a pair of base plates, and in this case 1, they are formed by bending a band-shaped metal plate in a stepwise manner along the longitudinal direction.
22) consists of a horizontal part (22a), a hanging part (22b) formed downward on one side edge, and an upstanding part (22c) formed upward on the other side edge, and includes a base plate (22). The adjacent side edges (lla
) (12a), respectively. The horizontal portion (22) of this side edge (lla) (12a)
Anchors (2) made of multiple reinforcing bars are attached to the surface in contact with
3) are buried at regular intervals with their tips protruding.

For this reason, the base plate (22) has a plurality of through holes in the horizontal part (2) so that these anchors (23) can be inserted therethrough.
2a), and through this hole, the horizontal part (2a) is installed.
A naso l-(24) is screwed onto the tip of the anchor (23) protruding from 2a) to hold and fix the base plate (22).

A pair of elastic support members (25) (26) are provided on the surface of the horizontal portion (22a) of each base plate (22).
) is fixed. The outer support member (25) has a rod shape with a cross section, and its bent outer surface is connected to the upright portion (22c).
) and the surface of the horizontal portion (22a). The inner support member (26) is rod-shaped with a rectangular cross section and is provided in parallel with the outer support member (25), and the nut (24) is arranged in parallel between both support members (25) and (26). That's what I do. In addition, the base plate (22
), the upper end surface of the upright part (22c) is each road bridge (11)
(12) installed at the same height as the road surface,
Further, the support member (25) also has an upright portion (22c) on its upper end surface.
), so the upper end surfaces of the upright portion (22c) and the support member (25) are flush with the road surface.

(27) is the side edge of both road bridges (11) and (12) (
This is a cover plate to cover the gap between 11a) and 12a, and since the vehicle passes directly over it, it is necessary to use a rigid plate with high strength. In this embodiment, a thick belt-shaped steel plate is used. This cover plate (27
) includes a pair of inner support members (26) and a pair of outer support members (26) attached to the base plate (22).
The horizontal part of the supporting member (25) is supported by the horizontal part (22a), and both side edges thereof are in contact with the vertical part (the part located in the upright part (22C)) of the support member (25).

Note that the cover plate (27) is the supporting member (25).
(26) When placed on top of both road bridges (1
1) The thickness is set so that it is flush with the road surface (12).

(28) is an elastic member installed between both base plates (22), and in this embodiment, it is made up of a pair of rod-shaped elastic members (28a) with a rectangular cross section and a band-shaped plate (28b) whose upper end is bent at right angles. It is configured. Each elastic body (28
One of the left and right sides of a) is base play 1- (
22), and the other is fixed to the left and right side surfaces of the strip plate (28b). A plurality of through holes are arranged in parallel at the bent upper end of the strip plate (28b) at positions corresponding to the through holes arranged in parallel along the longitudinal direction at approximately the center of the cover plate (27). ,
Poles (29) are inserted into these holes from the surface of the cover plate (27), and nuts (30) are screwed onto the bolts (29) from below. In this way, the end of each elastic body (28a) from the center is connected to the cover plate (27).
) is connected.

The expansion joint (21) configured as described above is partitioned into appropriate lengths in the longitudinal direction, and when installed, a plurality of expansion joints (21) are installed in parallel with both ends touching. It turns out.

This expansion joint (21) connects a cover plate (27) made of a rigid material to support members (25) (26) having elasticity.
27
) can be absorbed by the elasticity of the support members (25, 26), and no large force is applied to a part of the cover plate 1- (27).

When road a (11) (12) expands or shortens due to temperature changes, a relative displacement occurs in the bridge axis direction, and a shearing force acts on the expansion joint (21) along the longitudinal direction, but this force is The members (24) (25) and the elastic body (
28a) and the cover plate (27)
No large force acts on it. That is, shear force is generated when the two roads fi (11) (12) have different degrees of expansion and contraction, but the cover plate (27)
25) This shearing force does not act on the cover plate (27) because it can be slid on (26) and the pair of elastic bodies (28a) can be deformed in the longitudinal direction. Further, the relative displacement between the road JFD (11) (12) and the cover plate (27) is performed without any problem because the cover plate (27) slides on the support members (25) (26).

In addition, when the distance between the road bridges (11) and (12) changes and there is relative displacement in the horizontal direction perpendicular to the bridge axis direction, the elastic member (28) and the support member (25) are compressed and tensile deformed. This power can be absorbed. Furthermore, road bridge (1)
(12) is relatively displaced in the circumferential direction around the bridge axis and a bending force is applied to the expansion joint (21), this force is
In the same manner as in the above case, the supporting members (25) (26
) and the deformation of the elastic member (28). Further, the relative displacement between the cover plate (27) and the base plate (22) that occurs at this time is such that the cover plate (27) can slide on the support members (25) and (26), and the support member (25) Since it can be elastically deformed, it can be carried out without any problems.

Note that the cover plate (27) is attached to the support member (25) (2
Although it is not held in any way by the strip plate (2)
Since it is connected to the elastic body (28a) by the support member (25) (8b), it will not float or separate from the support member (25) (26).

〔Effect of the invention〕

As is clear from the above description, the expansion joint (21) according to the present invention is installed between the side edges (lla) (12a) of the road bridge (11) (12) along the bridge axis direction. The road bridge (11) (12) can be connected, and even if the relative displacement due to temperature change of the road bridge (11) (12) is quite large, the action of the force caused by it can be sufficiently absorbed, Moreover, it has excellent durability. Further, the structure is simple because the only necessary parts are the pair of base plates (22), support members (25) (26), cover plate (27), and elastic member (28).

Furthermore, the installation of this expansion joint (21) is similar to that of a road bridge (11) that interconnects a pair of base plates (22).
After fixing to the side edges (lla) (12a) of (12), the cover plate (27) is placed on the support members (24) (25), and then the elastic member (28) is placed on the cover plate (27). ).

Therefore, the installation work is not only easy, but also nut (2
4) Remove the bolt (29) and Nando (30)
It can be replaced by unscrewing it, and it also has the advantage of being easy to replace.

[Brief explanation of the drawing]

FIG. 1 is a partially enlarged perspective view showing the expansion joint according to the present invention installed on a road bridge. FIG. 2 is a perspective view of the whole. FIG. 3 is a plan view of a road bridge equipped with conventional lateral expansion joints. FIG. 4 is a plan view of a road bridge equipped with vertical expansion joints.

Claims (1)

[Claims] 1. A pair of base plates (22) each fixed to the adjacent side edges of two interconnecting bridges, and an elastic member (22) installed between the pair of base plates (22).
28), and is slidably supported by the pair of base plates (22) via elastic support members (25) fixed to each of the base plates (22), and covers the gap between both base plates (22). Rigid cover plate (27)
The base plate (22) further includes a horizontal part (22a), a hanging part (22b) formed downward on one side edge thereof, and an upstanding part (22b) formed upward on the other side edge.
22c), and the support member (25) is provided in the horizontal part (22a) and the upright part (22c), and the part in the horizontal part (22a) is provided with the cover plate (22c).
27) is slidably supported, and the upright portion (22c
) is in contact with the side edge of the cover plate (27), and the elastic member (28) has one end fixed to each of the pair of hanging parts (22b), and has a substantially central portion thereof in contact with the side edge of the cover plate (27). A bridge expansion joint characterized by being connected to a cover plate (27).