JPH11152707A - Expansible joint for bridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a durable expansible joint for a bridge without impairing the traveling characteristic of vehicles. SOLUTION: The expansible joint is provided with support bodies 2 of beams arranged in the spaces K, K opened to the opposite face sides of bridges H, H respectively, a plurality of support beams 3 laid between the bridges H, H in such a manner as the support beams are supported by the support bodies 2, 2, and at least one intermediate beam 4 arranged in such a manner as the intermediate beams orthogonally cross the longitudinal direction of the bridges between the bridges H, H and supported by a part of the support beams 3 or the whole thereof. In this case, the support bodies 2 of the beams are provided with brackets 20, external ribs 21 held by the brackets 20, and internal rings 22 fitted in the external rings 21 in a spherically contrapositive condition and provided with the through holes 23. The support beam 3 is held by the support bodies 2 so that it is freely inserted into the through hole 23 or drawn therefrom.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an expansion joint for a bridge.

[0002]

2. Description of the Related Art As an expansion joint for a bridge, for example, FIG.
As shown in FIG. 10 and FIG. 10, a box 90 buried in the opposite bridges H, H and opened to the opposite surface side,
A plurality of support beams 91 erected between the bridges H, H in such a manner that the ends are inserted into 0, 90; upper and lower elastic members 92a, 92b supporting each support beam 91 in the box 90; Support beam 91
Upper and lower intermediate beams 93 placed on the upper surface in a manner orthogonal to this
And a sealing member for closing a gap between the intermediate beams 93, 93, etc.
94.

In this joint, when the opposing bridges H, H are separated from each other, the support beam 91 and the elastic members 92a, 92b slide to absorb the same, and when a step is formed in the opposing bridges H, H, the elastic member It is absorbed by the elastic deformation of 92a and 92b.

[0004] However, in the above expansion joint for bridges,
To absorb the steps between the bridges H, H, elastic members 92a,
Since both materials 92b must be made of a material having good followability, the displacement in the vertical direction due to the wheel load increases, and a step is formed between the intermediate beams 93, 93 as shown in FIG. In this case, the traveling performance when passing the vehicle is deteriorated.

[0005] To solve the above problem, the following method can be considered. Only the elastic member 92b has high vertical rigidity. In this method, when a step is formed between the bridges H, H,
As shown in FIG. 12, the support of the support beam 91 by the elastic member 92b becomes a so-called linear support. In this case, stress concentration occurs in the wire support portion, and the life of the joint is shortened. In this method, the elastic members 92a and 92b are interposed between the box 90 and the support beam 91 while being compressed by a large force. This method increases the sliding resistance between the elastic members 92a and 92b and the support beam 91. When the bridges H move relative to each other, a large force is applied to the elastic members 92a and 92b, so that the joint life is short.

Accordingly, in recent years, there has been a demand for the development of an expansion joint for a bridge that does not significantly impair the traveling performance when passing a vehicle and has a long life.

[0007]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an expansion joint for a bridge having a long life without significantly impairing the traveling performance when passing through a vehicle.

[0008]

SUMMARY OF THE INVENTION The present invention is directed to a beam support 2 disposed in spaces K, K open to the opposing surfaces of bridges H, H, and held by the beam supports 2, 2 respectively. And a plurality of support beams 3 erected between the bridges H and H in a manner perpendicular to the longitudinal direction of the bridge between the bridges H and H and supported by all or some of the support beams 3. In a bridge expansion joint comprising at least one intermediate beam 4, the beam support 2 comprises a bracket 20;
, And an inner ring 22 fitted into the outer ring 21 in a spherical-paired state and having a through-hole 23, and the support beam 3 is inserted into the through-hole 23 so as to be able to move forward and backward. It is held on the beam support 2 in this manner.

The function of the expansion joint of the present invention will be described in the following embodiments of the present invention.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an expansion joint for a bridge according to an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a state in which a bridge expansion joint J according to an embodiment of the present invention is installed between ends of bridges H, H facing each other. [Overall configuration of expansion joint J for bridge ] This expansion joint J for bridge
As shown in FIGS. 1 and 2, a box 1 buried to be open to the opposite surface side of the bridge H, H, and a beam support 2 arranged in the space K, K of the box 1 respectively. A plurality of support beams 3 erected between the bridges H, H while being held by the beam supports 2, 2, and arranged in a manner orthogonal to the longitudinal direction of the bridge between the bridges H, H; Two intermediate beams 4 supported by support beams 3 of the
And a sealing member 5 that closes the gap between the upper end and the intermediate beam 4 and the gap between the intermediate beams 4 and 4. [Structure of Box 1 ] As shown in FIG. 1, the box 1 comprises a thick upper piece 10, a thin lower piece 11, and upper and lower pieces.
It has a U-shaped cross section composed of a connecting piece 12 connecting the parts 10 and 11, and a groove 13 is formed at an edge of the upper piece 10.

The box 1 is welded and fixed to anchors (not shown) embedded in the bridges H, H. [Structure of Beam Support 2 ] Beam support 2 is shown in FIGS.
As shown in FIG. 5, a bracket 20 having a large number of holes 20a,
An annular rubber member 24 for cushioning shock provided along the component wall of the hole 20a, an outer ring 21 fitted in the annular rubber member 24, and a through hole 23 fitted in the outer ring 21 in a spherical paired state. And an inner ring 22 having The inner ring 22 is configured to rotate with a relatively small force with respect to the outer ring 21, and the support beam 3 can be advanced and retracted with a relatively small force with respect to the inner ring 22. And
The annular rubber member 24 is made of a relatively hard material so that the vertical displacement due to the wheel load does not increase. [Configuration of Support Beam 3 ] As shown in FIG. 1, the support beam 3 is formed of a shaft having a circular cross section, and has a diameter corresponding to the diameter of the through hole 23 of the inner ring 22 described above. [Structure of the Intermediate Beam 4 ] As shown in FIGS. 1 and 2, the intermediate beam 4 includes a main body 40 having the same configuration as the beam support 2 and upper and lower pieces 41 and 42 provided above and below the main body 40. And is composed of
Grooves 43 are provided on both edges of the upper piece 41. [Structure of Seal Member 5 ] As shown in FIG. 1, the seal member 5 has a substantially V-shaped cross section formed of an elastic member, and is forcibly inserted into the above-mentioned grooves 13 and 43 at both edges. The projection 50 is provided. [Others] In this expansion joint J for bridges, although not shown in FIGS. 1 to 7, the intermediate beams 4 and the like operate as shown below with the relative movement of the opposing bridge girders H, H. ing. When the bridge girders H and H approach and separate from each other, the interval between the beam support 2 and the intermediate beam 4 and the interval between the intermediate beams 4 and 4 become narrower and wider while maintaining the same parallelism. . When a step is formed between the bridge girders H, H, the perpendicular posture of the intermediate beam 4 with respect to the support beam 3 is maintained. When the bridge girders H, H move relative to each other in a direction perpendicular to the longitudinal direction thereof, the support beams 3 are inclined with respect to the bridge girder longitudinal direction line, but the beam support 2 and the intermediate beams 4 are maintained parallel. Has become.

Here, as the configuration for operating the intermediate beam 4 and the like as described above, a known configuration to which a link mechanism or the like is applied can be used, but a new configuration (an example) shown in FIG. 8 can also be adopted. That is, as shown in FIG. 8, stop plates 60 are fixed to both ends of the support beam 3, between the stop plate 60 and the beam support 2, between the beam support 2 and the intermediate beam 4, and the intermediate beams 4 and 4. The structure is such that coil springs 61 and 62, which have been preloaded, are attached to the support beam 3 between the four beams. [Materials of each component] Box 1: Hard metal such as steel Beam support 2 Bracket 20: Hard metal such as steel Outer ring 21: Hard metal such as steel Inner ring 22: Hard metal such as steel Ring rubber member 24: Rubber etc. The inner and outer peripheral surfaces of the inner ring 22 are coated with, for example, fluorocarbon resin or Duracon.

Support beam 3: Hard metal such as steel Intermediate beam 4: Basically the same as beam support 2 Seal member 5: Elastic member such as rubber [Function of this expansion joint J for bridge ] Expansion joint for bridge J
Is installed in the manner shown in FIG. 1 and performs the following functions in this installed state. The support beam 3 is supported by an inner ring 22 fitted in an outer ring 21 held by a bracket 20 in a spherical pair, and the annular rubber member 24 is made of a relatively hard material. Vertical displacement due to wheel load hardly occurs between the beams 4. Therefore, it is possible to suppress the deterioration of the traveling performance when passing the vehicle. The posture of the support beam 3 can be freely and freely changed in the three-dimensional direction by the movement of the inner ring 22 with respect to the outer ring 21, so that the life of the joint is long. The approach / separation of the opposing bridges H, H is shown in FIG. 5 and FIG.
As shown in FIG. 6, the slip can be absorbed by the sliding between the inner ring 22 and the support beam 3. The step between the opposing bridges H, H can be absorbed by the change in the attitude of the support beam 3 due to the movement of the inner ring 22 with respect to the outer ring 21 and the slip between the inner ring 22 and the support beam 3 as shown in FIG. Although not shown, the deviation between the opposing bridges H, H in the direction orthogonal to the longitudinal direction of the bridge is not shown,
The movement can be absorbed by the change in the posture of the support beam 3 due to the movement of the inner ring 22 and the slip between the inner ring 22 and the support beam 3. [Other Embodiments] Instead of the above embodiment, the fitting between the inner ring of the beam support 2 and the intermediate beam 4 and the support beam 3 may be of a spline type.

Instead of the above embodiment, the intermediate beam 4 may be supported by a part of the support beam 3. In this case, a circular hole or a horizontally long hole larger than the support beam 3 may be provided in a portion of the intermediate beam 4 not supported by the support beam 3, and the support beam 3 may be loosely inserted into these holes. .

In place of the above embodiment, the number of the intermediate beams 4 may be one, or three or more.

Instead of the above embodiment, the spaces K, K open to the opposing surfaces of the bridges H, H may be formed without burying the box 1.

Instead of the above embodiment, box 1
As shown in (1), a form embedded in the bridge H may be adopted.

Instead of the above embodiment, the intermediate beam 4 may be of a type mounted on the support beam 3 as shown in FIG.

[0020]

According to the description of the embodiments of the present invention, it is possible to provide an expansion joint for a bridge having a long life without significantly impairing the traveling performance when passing through a vehicle.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a state in which a bridge expansion joint according to an embodiment of the present invention is installed between facing bridge girders.

FIG. 2 is a perspective view of the expansion joint for a bridge.

FIG. 3 is an explanatory view of a beam support of the expansion joint for a bridge.

FIG. 4 is an explanatory view of a beam support of the expansion joint for bridges.

FIG. 5 is a cross-sectional view showing a state of a bridge expansion joint when opposing bridges approach each other.

FIG. 6 is a cross-sectional view showing a state of a bridge expansion joint when opposing bridges are separated from each other.

FIG. 7 is a cross-sectional view showing a state of a bridge expansion joint when a step is formed between opposing bridges.

FIG. 8 is an explanatory diagram of a moving mechanism for an intermediate beam and the like provided in the bridge expansion joint.

FIG. 9 is a cross-sectional view showing a state in which a conventional expansion joint for bridges is installed between opposing bridge girders.

FIG. 10 is a perspective view of a conventional expansion joint for a bridge.

FIG. 11 is a sectional view showing a state of a conventional expansion joint for bridges when a wheel load is applied.

FIG. 12 is a cross-sectional view illustrating a state of a conventional expansion joint for bridges when a step is formed between opposing bridges.

[Explanation of symbols]

 H Bridge K Space 1 Box 2 Beam support 3 Support beam 4 Intermediate beam 20 Bracket 21 Outer ring 22 Inner ring 23 Through hole

Claims (1)

[Claims] A beam support (2) arranged in spaces (K) open to the opposing surfaces of the bridges (H), (H), and the bridges (H) and (H) being held by the beam supports (2). A plurality of support beams 3 laid therebetween, and at least one intermediate beam 4 disposed between the bridges H and H in a manner orthogonal to the longitudinal direction of the bridge and supported by all or some of the support beams 3; In the expansion joint for bridges comprising: a beam support 2 comprises: a bracket 20; an outer ring 21 held by the bracket 20;
An inner ring 22 fitted in the outer ring 21 in a spherical-paired state and having a through-hole 23; and the support beam 3 is held by the beam support 2 in such a manner as to be inserted into the through-hole 23 so as to be movable forward and backward. An expansion joint for a bridge, characterized in that the expansion joint is for a bridge.