JPH0913317A - Earthquake resistant connecting device of bridge girder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the absorptive capacity of impulsive forces due to earthquakes without a large-change or a bridge girder structure, in an earthquake resistant connecting device installed in the clearance between adjacent main girders of a steel elevated bridge. SOLUTION: When a pair of connecting plates 13', 13' are connected to each other to make a link through three bolts 12', 12' 12' in the free space 7 between adjacent main girders 4, 4, a room is made between the bolt holes of the connecting plates and the bolt shafts to form a ring-shaped clearance. A buffer material like lead, aluminum, hard rubber, and laminated rubber, is interposed in the ring-shaped clearance. Since the link-form connecting plates 13', 13' are joined together through three bolts 12', 12', 12', a relative movement of adjacent main girders 4, 4 is allowed to prevent the bridge from falling. And further, the absorptive capacity of energy is increased in the breakage of the earthquake resistant connecting device against the impulsive load at an earthquake and hence, the fragile damage like rupture of bolts 12' and tear of the body plate or the reinforcing plates thereof can be prevented. Therefore, the function as a bridge beam can be sufficiently brought out and the durability can be retained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The disclosed technology belongs to the technical field of the structure of a device for connecting steel main girders of a steel viaduct in a seismic manner.

[0002]

2. Description of the Related Art As is well known, the improvement of civic life is supported by the rise of industry, and the development of the industry is nationwide regardless of whether it is urban or rural. Transportation facilities such as railways and motorways that connect rural areas are networked all over the country.

[0003] Under the terrain conditions of Japan, where many mountain forests are located close to a complicated and intricate coastline, bridges are required in mountainous areas for a railroad and motorway network connecting nationwide. In addition, even in an urban area, a viaduct is used on a highway that passes between adjacent buildings.

Recently, steel viaducts have come to be used from the viewpoints of earthquake resistance due to heavy load and resource saving.
As shown in, the main girders 4 and 4 of the simple girder 3 are connected to the bridge piers 2 which are erected at a predetermined interval with respect to the ground 1 through the shoes 5 between the piers 2. A floor plate 6 made of concrete or the like is laid on the upper surface of the base plate, and an expansion joint 8 is provided for a clearance 7 between the main girders 4 and 4 of the floor plate 6, and an earthquake-proof connecting device is used to connect the main girders 4 and 4. 9 is provided.

Further, in such an viaduct, a seismic coupling device 9 is provided as a measure for preventing a bridge from falling during an earthquake, so that the free space 7
Is prevented from spreading during an earthquake, and the weight of the adjacent main girders 4, 4 is utilized to prevent the fixed side from serving as an anchor and the movable side main girder 4 from falling.

Thus, as shown in FIG. 6, the seismic coupling device 9
In that case, the abdominal plate reinforcing plate 11 is attached to both main girder abdominal plates 10 by sandwiching the play gaps 7 of the different main girders 4 and 4, and the abdominal plate reinforcing plate 1
The connecting plates 13 are provided on the movable terminals 1 and 11 via the bolts 12 and 12 with the loose holes 14 provided on the movable side so as to absorb expansion and contraction of the clearance 7 due to temperature change.

Reference numeral 15 denotes a rib.

[0008]

However, in the seismic coupling device 9 according to the related art of the aspect, although a maximum factor of 4.0 for the design horizontal seismic coefficient is considered, a case of a great earthquake or the like is considered. Has a drawback that brittle damage such as breakage or tearing often occurs in the bolt 12, the connecting plate 13, or the main girder abdominal plate 10 due to an impact load, and it is inferior in energy absorption performance in earthquake resistance. There were difficulties.

[0009]

OBJECT OF THE INVENTION The object of the invention of this application is to solve the problems of the seismic coupling device for earthquakes in viaducts based on the above-mentioned prior art, and to expand and contract the clearance between the adjacent main girders. It is tolerable, and the seismic energy absorption performance is improved to prevent brittle damage to bolts and connecting plates due to shock loads during an earthquake. The purpose of the present invention is to provide an excellent seismic coupling device for bridge girders, which can improve the energy absorption performance without significantly changing the structure of the steel viaduct of the above, and benefit the field of utilizing seismic technology in the bridge construction industry. .

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the structure of the invention of the present application, which has the above-mentioned object as its gist, has the free space between adjacent main girders of steel viaducts. In order to integrally fasten the connecting plate to the abdominal plate of the main girder through the bolt, the bolt for the connecting plate is inserted through the ring-shaped gap, and lead and aluminum are inserted in the ring-shaped gap. , Cushioning material such as hard rubber, laminated rubber, etc. is interposed so that the shocking force can be alleviated when the shocking force of unexpected seismic intensity acts, and the energy absorption performance of the seismic coupling device is improved. Technical means for improving the durability of the viaduct, and for improving the shock absorbing performance of the seismic coupling without significantly changing the structure of the existing bridge. Was taken.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

It should be noted that the same mode parts as those in FIG.

The illustrated embodiment is a mode of seismic-resistant connection of steel viaducts for expressways, and a space 7 between adjacent main girders 4 and 4 is used.
Ribs 15, 15 facing each other in the abdominal plates 10, 10
When connecting the abdominal plate reinforcing plates 11, 11 with the bolts 12, the pair of connecting plates 13 ', 13' facing each other are connected with three bolts 12, 12, 12 in a link manner.

For example, it is possible to modify the existing seismic coupling device 9 in the conventional manner shown in FIG. 6 in the following manner.

That is, when a bolt 12 'having an outer diameter of the bolt shank 17 smaller than that of the existing bolt 12 is used, the bolt shank 17 of the bolt 12' has a smaller diameter than the bolt hole of the connecting plate 13 '. Therefore, in the ring-shaped gap between the connecting plate 13 'and the bolt hole of the abdominal plate reinforcing plate 11' and the bolt shaft portion 17 of the bolt 12 ', short cylindrical lead, aluminum, hard rubber, laminated rubber, etc. The cushioning material 16 of 1 is fitted.

It should be noted that a high strength material is used as the material of the bolt 12 'to reduce the outer diameter of the bolt shaft portion 17 of the bolt 12' to ensure breaking strength.

Then, the bolt 12 'is inserted through the cushioning material 16 and connected by the nut 12''.

In the above structure, when the bridge girder seismic coupling device 9 ″ of the invention of this application is used to connect adjacent main girders 4 and 4 through the play gap 7, one main girder 4 on the fixed side is connected. On the other hand, even when the movable main girder 4 behaves thermally due to a temperature change and the play gap 7 expands and contracts, the connecting plates 13 'and 13' are fixed to the bolt 1
By being connected in a link manner via 2 ', 12', 12 ', the expansion and contraction thereof is allowed and the introduction of temperature stress and the like can be avoided.

Even if a shocking load is applied to the connecting device 9'when an earthquake occurs, the buffer material 16 absorbs energy, and in this case, hard rubber is mixed with lead or aluminum. As a result, seismic isolation is improved, and therefore there is no possibility that the bolt 12 ', the abdominal plate reinforcing plate 11, and the main girder 4 will be broken or torn, and therefore the durability of the steel viaduct is guaranteed. The function as a bridge is fully maintained.

Of course, the embodiment of the invention of this application is not limited to the above-mentioned embodiment. For example, the cushioning material is lead, aluminum, hard rubber, laminated rubber, or a mixture thereof. Of course, it is possible to use any of the above.

Further, instead of using the above-mentioned small-diameter bolts, the bolt holes of the connecting plate 13 'and the abdominal plate reinforcing plate 11' are appropriately enlarged so that there is a margin between the bolt shaft portion and the bolt hole. It is also possible to connect with the nut 12 ″ by using the bolt 12.

Furthermore, in terms of design modification, various modes can be adopted such that the cushioning material can be interposed only on the outside of the bolt between the bolt hole of the connecting plate.

[0023]

As described above, according to the invention of this application, basically, the clearance between the adjacent main girders of a steel viaduct is integrally connected to the abdominal plate of the main girder via the connecting plate. In the seismic connection device for bridge girders, bolts connecting the connecting plates are inserted through a ring-shaped gap, and a cushioning material such as lead, aluminum, laminated rubber or hard rubber is inserted in the ring-shaped gap. As a result, it is possible to improve the performance of absorbing the energy of breakage due to a shocking load of the connecting device during an earthquake, and therefore brittle breaking of the connecting plate or breakage of the bolts does not occur. Excellent effect is achieved.

Further, when the seismic coupling device of the invention of this application is provided in the free space between the adjacent main girders, the bolt shaft portion of the bolt is not changed to the existing existing structure without largely changing the structure of the existing bridge. By making it smaller than the bolt shaft of the bolt, or increasing the diameter of the bolt hole of the connecting plate etc. to create a margin between the bolt and the bolt hole, it is possible to insert a cushioning material in the ring-shaped gap. The excellent effect that the existing bridge connecting device can be used and the earthquake resistance can be improved is exhibited.

Therefore, there is also an advantage that the cost is low.

[Brief description of the drawings]

FIG. 1 is a partially enlarged side view of an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II-II of FIG.

FIG. 3 is a partially enlarged side sectional view of FIG. 2;

FIG. 4 is a half cross-sectional plan view of the connection between the bolt and the cushioning material.

FIG. 5 is a side view of a main part of a steel viaduct.

FIG. 6 is a partially enlarged side view of the bridge girder seismic connection device based on the conventional mode.

FIG. 7 is a side sectional view taken along the line VII-VII of FIG. 6;

[Explanation of symbols]

 4 main girder 7 play space 9 belly plate 13 connection plate 12 bolt 16 cushioning material 9'seismic connection device

Claims (3)

[Claims] 1. A seismic bridge connecting device for bridge girders, wherein a connecting plate is integrally connected to a web plate of the main girder via bolts to a free space between adjacent main girders of a steel viaduct. A seismic coupling device for a bridge girder characterized in that a bolt is inserted through a ring-shaped gap, and a buffer material is interposed in the ring-shaped gap. 2. The seismic coupling device for bridge girders as set forth in claim 1, wherein the ring-shaped gap is formed by making the bolt hole of the connecting plate larger than the bolt shaft portion. 3. The seismic resistance of the bridge girder according to claim 1, wherein the ring-shaped gap is formed by making the outer diameter of the shank of the bolt smaller than the inner diameter of the bolt hole of the connecting plate. Coupling device.