JP2002129509A - Expansion joint keeping up with base-isolating bridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an expansion joint keeping up with a base-isolating bridge, which can keep up with the movement of a load-carrying capacity zone and in which expansion stress is not increased, the structure of which is simplified and the cost of which can be reduced. SOLUTION: The base-isolating bridge corresponding expansion joint has openings (h) and (h) formed to the opposed surfaces of bridges H and H, a supporting beam 1 in which end sections are inserted and held in a retractable manner in the opening sections (h) and (h), and at least one movement absorbing member 2 installed between the opposed surfaces of the bridges H and H directly or through another member and slidably placed on the supporting beam 1. The movement absorbing member 2 is composed of U-shaped sectional holding members 20 is which opening sections are arranged in an opposed mode, laminates 21, in which hard boards and rubber boards are laminated and fixed alternately and which are mounted among the upper and lower boards 20a and 20b of each holding member 20, and a chevron-shaped sectional projection 22, which is supported to the left-right laminates 21 and in which a top section is faced between the mutual left-right upper boards 20a and 20a while each upper board 20a is knocked off when the upper boards collide with the projection 22.

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 base-isolated bridge capable of coping with the amount of movement in a protective jurisdiction area.

[0002]

2. Description of the Related Art An example of this type of expansion joint for a base-isolated bridge is shown in FIG.

As shown in FIG. 12, this expansion joint for seismic isolation bridges has openings h, h on the opposing surfaces of the bridges H, H, respectively.
A support beam 90 is provided between the openings h, h, and one end of the support beam 90 is pivotally supported by the wall of one of the openings h so as to be able to swing horizontally. is there. As shown in FIG. 12, a plurality of long road surface constituent members 91 are respectively attached to the support beams 91 via support members 92, and the road surface member 91 is supported via the support members 92. Beam 90
Along with the support beam 90. Further, a control mechanism (not shown) is provided so that all the road surface constituting members 91 and 91 have an equal interval when the bridges H approach and separate from each other.

Therefore, in the above-mentioned expansion joint, even if an earthquake having an amount of movement in the protection zone occurs, the road surface component member 9 can be used.
The gap U is closed in such a manner that the distance between the first and the first 91 is equal, and the vehicle can pass.

[0005] However, the above expansion joints for base-isolated bridges have the following problems A and B. A. As described above, since a control mechanism for making all the road surface components 91 and 91 have an equal interval is indispensable, the device becomes large-scale and the cost increases. B. This expansion joint is difficult to transport because the entire length of the road is made of one piece, and cannot be partially replaced in the event of damage. In order to solve this problem, a system for connecting fixed-size objects is being adopted. However, it is difficult to stop water between the fixed-size units, and no good method has been found.

Therefore, in the industry that uses this type of expansion joints for seismic isolation bridges, seismic isolation bridges that can cope with the amount of movement in the protection zone, do not increase expansion stress, are simple in structure, and can reduce costs. We look forward to the development of a corresponding expansion joint, and also look forward to the development of a seismic isolation bridge-compatible expansion joint that has a structure that connects the fixed-length ones in addition to the above and has an excellent water-blocking effect. In.

[0007]

SUMMARY OF THE INVENTION Accordingly, the present invention provides an expansion joint for a base-isolated bridge which can cope with the amount of movement in the protective zone, does not have a large expansion stress, has a simple structure, and can be reduced in cost. Another object of the present invention is to provide an expansion joint for a base-isolated bridge having a structure that connects a fixed-size object in addition to the above and having an excellent water stopping effect.

[0008]

Means for Solving the Problems (Invention of Claim 1)
The expansion joint for a seismic isolation bridge according to the present invention includes openings h, h provided on opposing surfaces of the bridges H, H, and a support beam 1 whose ends are inserted and retained in the openings h, h so that they can be inserted and removed. Bridge H,
H at least one displacement absorbing member 2 mounted directly or via another member between the opposing surfaces of the H and slidably mounted on the support beam 1.
Is formed by alternately stacking and fixing a holding member 20 having a U-shaped cross section and a hard plate and a rubber plate which are arranged in such a manner that the opening portions face each other, and attached between the upper and lower plates 20a and 20b of each holding member 20. And the upper plate 20a, which is supported by the left and right laminates 21 and has a top portion facing between the left and right upper plates 20a and 20a, and each of the upper plates 20a collides with the protrusion 22. Knock off when you do. (The invention according to claim 2) The expansion joint for a base-isolated bridge according to the present invention relates to the invention according to the above-mentioned claim 1, wherein a plurality of moving amount absorbing members 2 are integrated directly or via other members. Is attached to one bridge H side, and the rightmost movement amount absorbing member 2 is attached to the other bridge H side. (An invention according to claim 3) An expansion joint for a base-isolated bridge according to the present invention relates to the invention according to claim 1 or 2, and relates to a holding member.
20 has a knock-off structure by bolting the upper plate 20a and the vertical plate 20c. (An invention according to claim 4) An expansion joint for a base-isolated bridge according to the present invention relates to the invention according to any one of claims 1 to 3, wherein the projection 22 has an end embedded and fixed to the left and right laminated bodies 21. Is fixed on the plate member 22a. (The invention according to claim 5) The expansion joint for a seismic isolation bridge according to the present invention relates to the invention according to any one of the above-described claims 1 to 4, and the lift prevention plate 3 between the movement amount absorbing members 2 and 2 is provided.
Is provided. (The invention according to claim 6) The expansion joint for a base-isolated bridge according to the present invention relates to the invention according to any one of claims 1 to 5, and is configured by connecting a plurality of unit bodies T via a connecting body S. The longitudinal edges of the upper plate 20a, the longitudinal edges of the laminated body 21, the longitudinal edges of the lower plate 20b, and the longitudinal edges of the projections 22 are displaced, and the unit T And the connection area between the connector and the connecting body S is increased.

The functions of the expansion joint for a base-isolated bridge according to the present invention will be clarified in the following embodiments of the present invention.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the drawings showing embodiments. [Embodiment 1] FIG. 1 shows an expansion joint corresponding to a base-isolated bridge according to an embodiment of the present invention installed between bridges H, H.
FIG. 3 is a perspective view of a unit body T that constitutes the expansion joint corresponding to the seismic isolation bridge.

As shown in FIG. 1, the expansion joint for a base-isolated bridge basically includes a support beam 1, two moving amount absorbing members 2, a floating prevention plate 3, and two fixing plates 4 as shown in FIG. And two boxes 5, and are installed using the box 5 fitted in the openings h, h. Here, the expansion joint corresponding to the seismic isolation bridge is a unit type, and the unit body T shown in FIG. 2 is connected to the connecting body S (upper plate 20) shown in FIG.
a corresponding to the upper plate 20A and the laminate 21 corresponding to the laminate 21
A, consisting of a vertical plate 21C corresponding to the vertical plate 20c, a lower plate 20B corresponding to the lower plate 20b, and a protrusion 22A corresponding to the protrusion 22, the portions of which are indicated by diagonal lines). There is something to be done.

The expansion joint for a base-isolated bridge according to this embodiment is designed to absorb the amount of movement in the protection area.
The dimensional relationship is set as shown in FIG.

Hereinafter, the main members constituting the expansion joint for the seismic isolation bridge will be described in detail. (Regarding the relationship between the opening h, the fixing plate 4, and the box 5) As shown in FIG. 1, the opening h has a rectangular parallelepiped shape provided at regular intervals in the direction perpendicular to the bridge axis on the mutually facing surfaces of the bridges H, H. Things.

The box 5 and the fixing plate 4 are integrated by welding or the like, and the box 5 is fixed in the opening h by the anchor bolt AB provided in the fixing plate 4 so as not to come off. (Regarding the Structure of the Support Beam 1) As shown in FIGS. 1 and 2, the support beam 1 has a rectangular cross section formed by fixing a bearing material 10 (for example, a rubber bearing with Teflon (registered trademark)) near both ends. It is a long shape, both ends of which are the bearing material
It is inserted into the box 5 in such a manner as to be positioned vertically by 10. And this support beam 1 is a bridge H,
When the members H approach and separate from each other, the bearing member 10 is inserted and removed while sliding on the inner surface of the box 5. Here, the above-described bearing material 10 is used as the support beam 1.
Instead of being provided on the side, it may be provided on the inner surface side of the box 5.

The support beam 1 is formed of a steel material. (Regarding the configuration of the moving amount absorbing member 2) The moving amount absorbing member 2
As shown in FIGS. 1 and 2, the fixing members 4, 4 are provided between the fixing plates 4, 4 fixed to the surfaces of the bridges H, H facing each other by anchor bolts AB. It is movably mounted.

Here, in this embodiment, the two moving amount absorbing members 2 absorb the moving amount of approaching / separating between the bridges H, H.
2 are bolted to each other via a lift prevention plate 3. The left moving amount absorbing member 2 is bolted to the left fixed plate 4, and the right moving amount absorbing member 2 is bolted to the right fixed plate 4, respectively.

As shown in FIGS. 1 and 2, each of the movable absorbing members 2 has a holding member 20 having a U-shaped cross section and an upper and lower plate 20a of each holding member 20. , 20b
It is composed of a laminated body 21 attached therebetween, and a projection 22 having a mountain-shaped cross section supported by the left and right laminated bodies 21 and having a top portion between the left and right upper plates 20a, 20a.

The holding member 20, as shown in FIGS. 1 and 2,
It is composed of upper and lower plates 20a, 20b and a vertical plate 20c,
As shown in FIG. 4, the upper plate 20a and the upper end of the vertical plate 20c
The lower plate 20b and the vertical plate 20c are fixedly integrated. In this embodiment, as shown in FIGS. 1 and 2, between the vertical plate 20c and the fixed plate 3, between the lower plate 20b and the support beam 1, and between the vertical plate 20c and the lift prevention plate 3. In the meantime,
In each case, a rubber sheet g is interposed. This is a vertical plate
This is to ensure the sealing performance between the lower plate 20b and the support beam 1 and between the lower plate 20b and the support beam 1 in order to ensure the sealability between the lower plate 20b and the support beam 1. is there. In this embodiment, as shown in FIG. 3, the longitudinal edge of the upper plate 20a, the longitudinal edge of the laminate 21, the longitudinal edge of the lower plate 20b, and the longitudinal direction of the protrusion 22 are provided. The edge and the edge are displaced, and the area of contact with each connecting body S is increased (the contact surface is a thick line portion indicated by the symbol W) to improve the water stopping effect.

The laminate 21 is formed by alternately laminating and fixing a hard plate and a rubber plate. The upper surface of the laminate 21 is bolted to the upper plate 20a, and the lower surface thereof is bolted to the lower plate 20b. The reason why the laminated body 21 and the upper plate 20a are fixed by the bolts B together with the above-described bolting structure of the upper plate 20a and the vertical plate 20c is that the upper plate 20a collides with the projection 22. Upper plate
This is to knock off 20a.

The projections 22 are basically as described above, but more specifically, as shown in FIG. 1, the right and left ends are fixed on a plate material 22a embedded and fixed in the left and right laminates 21. The lower part has a gentle slope, and the upper part has a steeply inclined slope. The projection 22 has such a cross-sectional shape because the inner end of the upper plate 20a and the projection 11
This is to increase the distance between the oblique sides.

The above-mentioned holding member 20 and projection 22 are
Both are made of steel. (Regarding the structure of the lifting prevention plate 3) As shown in FIG. 1 and FIG.
The bearing member 10 for receiving the support beam 1 is disposed on the lower side of the opening 30.

The lift prevention plate 3 is made of steel. (Regarding the Structure of the Fixing Plate 4) As shown in FIGS. 1 and 2, the fixing plate 4 is formed by forming an opening 40 through the support beam 1 in a plate material, and a lower side of the opening 40. Is provided with a bearing member 10 for receiving the support beam 1.

The fixing plate 4 is made of a steel material. (Regarding Configuration of Box 5) As shown in FIG. 1, the box 5 is formed in a rectangular parallelepiped shape having only one surface open, and is made of steel. (About the basic functions of this expansion joint for seismic isolation bridges)
The seismic isolation bridge-compatible expansion joint functions as follows with respect to the amount of movement assumed at all times, at the time of seismic intensity method, and at the time of the maintenance method. Normal movement This is movement due to approach / separation between the bridges H, H due to a change in ambient temperature. The movement in the bridge axis direction is ± 100 mm or less, and the movement in the direction perpendicular to the bridge axis is ± 50 mm or less.

In summer, the temperature of the atmosphere rises, and the bridge H grows accordingly. Therefore, the expansion joints corresponding to the seismic isolation bridge approach each other from the state shown in FIG. 1 in such a manner that the holding members 20, 20 of the respective moving absorbing members 2 cause the laminates 21, 21 to undergo small shear deformation as shown in FIG. 6. In this state,
The inner end of the upper plate 20a and the projection 22 are separated from each other at a large interval.

In winter, the ambient temperature decreases, and the bridge H shrinks accordingly. Therefore, the expansion joint corresponding to the seismic isolation bridge is moved from the state of FIG.
Are separated from each other in such a manner that the laminates 21 are slightly sheared. Movement assumed during seismic intensity method The amount of movement in the bridge axis direction is ± 200 mm or less, and the amount of movement in the direction perpendicular to the bridge axis is ± 100 mm or less.

In the case of movement in the direction of the bridge axis, the expansion joint corresponding to the seismic isolation bridge is changed from the state of FIG. 1 to the holding members 20 of each movement absorbing member 2 as shown in FIGS. It approaches and separates in a manner that causes large shear deformation. In the state where the holding members 20, 20 approach each other, the inner end of the upper plate 20a and the projection 22 are very close to each other.

In the case of movement in the direction perpendicular to the bridge axis, the movement absorbing members 2 and 2 do not approach or separate from each other. The same applies to the following. Movement assumed at the time of the Conservation Act The movement in the bridge axis direction is ± 201 mm or more, and the movement in the direction perpendicular to the bridge axis is ± 101 mm or more.

In this case, the expansion joints corresponding to the seismic isolation bridges are changed from the state shown in FIG. 1 to the holding members 20, 20 of the respective moving absorbing members 2 as shown in FIGS. Approach / separate in a manner that causes The holding member 20,
20 are so close to each other that the inner end of the upper plate 20a collides with the side wall of the projection 22, and the bolt B shown in FIG. It will be in a floating state. In this state, even if the upper plate 20a flies to another place, the upper surface of the stacked body 21 and the upper end of the projection 22 face the road surface, so that an emergency vehicle or the like can pass. As described above, this expansion joint for a base-isolated bridge can absorb not only the amount of movement at all times or at the seismic intensity method, but also the amount of movement at the time of the durability method. (Other functions of this expansion joint for seismic isolation bridge) With the expansion joint for seismic isolation bridge of this form, the control mechanism described in the section of the prior art is unnecessary, and the structure becomes very simple and cost can be reduced. .

Further, since the expansion joint for a seismic isolation bridge of this embodiment is constructed by connecting the unit bodies T, T via the connecting body S, it is easy to transport, and in the event of breakage. Can be replaced at least for each unit T.

Further, the structure in which the bonding area between the unit T and the connector S is increased has an excellent water stopping effect. [Other Embodiments] In the above embodiment, two moving amount absorbing members 2 are provided. However, the present invention is not limited to this. It is assumed that the moving amount absorbing member 2 includes one and three moving amount absorbing members. be able to.

In the above embodiment, the two moving amount absorbing members 2 are integrated by bolts or the like via the lifting prevention plate 3, but the two moving amount absorbing members 2 may be integrated directly by bolts or the like. Good.

In the above embodiment, the movable absorbing member 2 is attached to the bridge H via the fixing plate 4, but the movable absorbing member 2 may be attached directly to the bridge H.

[0033]

The present invention has the following effects since it has the above-described configuration.

As is clear from the description of the embodiment of the present invention, an expansion joint for a base-isolated bridge which can cope with the amount of movement in the protective zone, does not increase expansion stress, has a simple structure and can reduce the cost. Can be provided, and
In addition to this, it was possible to provide an expansion joint for seismic isolation bridges that has a structure that connects fixed-length bridges and has an excellent water blocking effect.

[Brief description of the drawings]

FIG. 1 is a front view of an expansion joint for a base-isolated bridge according to an embodiment of the present invention.

FIG. 2 is a perspective view of a unit body constituting the expansion joint corresponding to the seismic isolation bridge.

FIG. 3 is an explanatory view of a water leakage path, a unit body, and a connecting body of the expansion joint for the seismic isolation bridge.

FIG. 4 is an explanatory view of a main part of a moving amount absorbing member constituting the expansion joint corresponding to the seismic isolation bridge.

FIG. 5 is a view showing dimensions of the expansion joint for the seismic isolation bridge.

FIG. 6 is a cross-sectional view showing a state in which a movement amount caused by approach of bridges at all times is absorbed.

FIG. 7 is a cross-sectional view showing a state in which a movement amount caused by separation of bridges at all times is absorbed.

FIG. 8 is a cross-sectional view showing a state in which a movement amount caused by the approach between bridges during the seismic intensity method is absorbed.

FIG. 9 is a cross-sectional view showing a state in which a movement amount caused by separation of bridges during the seismic intensity method is absorbed.

FIG. 10 is a cross-sectional view showing a state in which a movement amount caused by the approach between bridges during the protection method is absorbed.

FIG. 11 is a cross-sectional view illustrating a state in which a movement amount caused by separation of bridges during a protection method is absorbed.

FIG. 12 is a partial cross-sectional view of a prior art expansion joint for a base-isolated bridge.

[Explanation of symbols]

 H Bridge h Opening 1 Support beam 2 Movement absorption member 3 Lift-up prevention plate 20 Holding member 20a Upper plate 20b Lower plate 21 Laminate 22 Projection

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Keiichi Hamasa 172 Ikezawa-cho, Yamatokoriyama-shi, Nara Prefecture Nita Corporation Nara Factory F-term (reference) 2D051 FA06 FA10 FA21 2E001 DA01 DH31 DH39 FA01 FA30 FA53 GA01 GA10 GA12 GA47 GA63 GA66 HB02 HD01 HE01 LA18

Claims (6)

[Claims] 1. An opening h, h provided on a facing surface of a bridge H, a support beam 1 having an end inserted and inserted into the opening h, h so as to be able to be inserted and removed, and an opposition of the bridge H, H. At least one movement absorbing member 2 attached directly or via another member between the surfaces and slidably mounted on the support beam 1, wherein the moving amount absorbing member 2 has an open portion. A holding member 20 having a U-shaped cross section arranged in an opposed manner, and a laminate 21 formed by alternately laminating and fixing hard plates and rubber plates and attached between upper and lower plates 20a and 20b of each holding member 20; The projections 22 are supported by the left and right laminates 21 and have a mountain-shaped cross section whose tops face between the left and right upper plates 20a, 20a. Each of the upper plates 20a is knocked off when colliding with the projection 22. An expansion joint for seismic isolation bridges. 2. A plurality of moving amount absorbing members 2 are integrated directly or via another member, the leftmost moving amount absorbing member 2 is connected to one bridge H side, and the rightmost moving amount absorbing member 2 is connected to one bridge H side. The expansion joint for a base-isolated bridge according to claim 1, wherein the expansion joint is attached to the other bridge H side. 3. The expansion joint for a seismic isolation bridge according to claim 1, wherein the holding member 20 has a knock-off structure by bolting the upper plate 20a and the vertical plate 20c. 4. The support for a base-isolated bridge according to claim 1, wherein an end of the projection 22 is fixed on a plate 22a embedded and fixed to the left and right laminates 21. Expansion joints. 5. The expansion joint for a base-isolated bridge according to claim 1, wherein a lifting prevention plate 3 is provided between the movement absorbing members 2 and 2. 6. A structure in which a plurality of unit bodies T are connected via a connecting body S, and a longitudinal edge of the upper plate 20a and a laminated body
21, the longitudinal edge of the lower plate 20b,
The expansion joint for a base-isolated bridge according to any one of claims 1 to 5, wherein the longitudinal edges of the 22 are displaced to increase the bonding area between the unit body T and the connection body S.