JP2717952B2 - Seismic connection structure of bridge girder - Google Patents

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 citizens' lives is supported by the rise of industry, and the development of the industry is planned nationwide, regardless of whether it is in urban or rural areas. Transportation facilities such as railroads and motorways connecting rural areas are being constructed on a network-wide basis.

[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.

[0004] In recent years, steel viaducts have been used from the viewpoints of earthquake resistance due to a large load and resource saving.
As shown in the figure, the main girders 4 and 4 of the simple girder 3 are connected to the pier 2 erected at a predetermined interval with respect to the ground 1 via 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 slab, and an expansion joint 8 is interposed in a gap 7 between the main girders 4 and 4 of the floor plate 6. A device 9 is interposed.

In this viaduct, an earthquake-resistant connecting device 9 is provided as a measure to prevent a bridge from falling down in the event of an earthquake, so that the play space 7 is prevented from expanding in the event of an earthquake, and the weight of the adjacent main girders 4, 4 is utilized. The fixed main girder 4 is used as an anchor to prevent the movable main girder 4 from dropping.

As shown in FIGS. 4 and 5, in the seismic coupling device 9, the main girder abdominal plate 10 is attached to both main girder abdominal plates 10 with the play portions 7 of the different main girder 4, 4 interposed therebetween. The connecting plate 13 is provided on the abdominal plate reinforcing plates 11 and 11 via high-strength bolts 12 and provided with a loose hole 14 on the movable side to absorb expansion and contraction of the play portion 7 due to a temperature change. It is like that.

Reference numeral 15 denotes a rib.

[0008]

However, in the prior art seismic coupling device 9 according to this aspect, although a premium factor of up to 4.0 is considered for the design horizontal seismic intensity, the case of a large earthquake or the like is considered. Has the disadvantage that brittle damage such as breakage or tearing often occurs in the high-strength bolt 12, the connecting plate 13, or the main girder plate 10 due to an impact load, and energy absorption in seismic resistance. There was a disadvantage that the performance was inferior.

[0009]

SUMMARY OF THE INVENTION An object of the invention of this application is to solve the problems of the seismic coupling device against earthquakes in viaducts based on the above-mentioned prior art, and to enlarge and reduce the gap between the basic girders adjacent to each other. To improve the seismic energy absorption performance so as to prevent brittle damage to bolts and connecting plates due to shock loads during an earthquake, and to have a simple structure. It is intended to provide an excellent seismic connection device for bridge girders that can improve the energy absorption performance without greatly changing the structure of the existing steel viaduct and which is beneficial for the field of seismic technology in the bridge construction industry. is there.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the construction of the invention of the present application, which has the above-mentioned claims and aims at solving the above-mentioned problems, is mainly applied to a bridge such as a steel viaduct. A pair of connecting plates are connected to the gap between the girders in a link manner via link bolts to form a connecting device for the two units. Further, a pair of connecting plates of the connecting device for each unit are connected to each other by the link. A wire rope is interposed and connected with a socket or the like via a bolt. At this time, a pair of connecting plates of the connecting device of each unit are connected in a link type in a direction to reduce the opening angle, or the connecting plate is Are linked in such a direction as to widen the opening angle of the wire rope, and when an impact load is applied to the connecting device when an earthquake occurs, the impact load acts on the wire rope, The impact load After a certain degree of relaxation, the impact load acts on the bolt and the connecting plate, and is finally transmitted to the main girder plate, so that the energy absorbing performance of the connecting device is improved, and the bolt, the connecting plate and the connecting Technical measures were taken to prevent brittle breakage or tearing of the reinforcing plate or abdominal plate, maintain the function as a bridge, and improve durability.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to FIGS.
This will be described below.

The illustrated embodiment is applied to a steel viaduct on a highway or the like, and the embodiment shown in FIG. 1 is applied to a case where adjacent main girders 4 and 4 receive an impact load such that they are separated from each other when an earthquake occurs. This is an applied mode, and the gap 7 between the adjacent main girders 4 and 4
The ribs 1 are vertically spaced apart from each other on the abdominal plate 10 by a predetermined distance.
5, abdominal plate reinforcing plates 11, 11 are interposed, and a pair of U-shaped connecting plates 1 are provided for the abdominal plate reinforcing plates 11, 11.
3 'and 13' are connected in a linked manner as one unit connecting device 9 'via one link bolt 12' and each connecting plate 13 'is connected to one other bolt. 12
Is connected to the abdominal plate reinforcing plate 11 by means of.

The link-type connecting plates 13 ', 13' of the connecting device 9 'of each unit are supported by link bolts 12' at the tips of the mountain-shaped ends of the connecting plates 13 ', 13'. Is connected to the socket 16 of the wire rope 17 via its bracket 16 ', so that when the adjacent main beams 4, 4 act in directions away from each other, a link-type pair of connections of the connecting device 9 of each unit. Board 1
The wire rope 17 is assisted in the direction in which the wire rope 17 extends through 3 'and 13'.

In the above configuration, a pair of connecting plates 13 ', 1 of the connecting device 9' of each unit connected independently of each other.
When an impact load acts on the connecting devices 9 'and 9' during an earthquake due to the wire rope 17 being stretched between 3 ', the impact load acts on the wire rope 17 first, and the extension of the impact load reduces the impact load. After the energy is absorbed and relaxed to some extent, it acts on the link bolt 12 ′ and the connecting plate 13 ′ and is finally transmitted to the main girder plate 10.

Therefore, the energy absorption performance of the connecting device 9 'at the time of breakage due to an impact load during an earthquake is improved, so that the link bolt 12' breaks sharply or the connecting plate 13 '.
The brittle tearing of the slab, abdominal plate reinforcing plate 11 and the main girder abdominal plate 10 is avoided, so that the function as a bridge is maintained over time and the durability is maintained.

In the embodiment shown in FIG. 2, the energy absorption of the impact load by utilizing the elongation of the wire rope 17 when the opening angle of the connecting plates 13 ', 13' is widened is different from the above embodiment. In this embodiment, the connecting plates 13 ', 13' are linked to the link bolts 12 ', 13', 13 'so that the opening angle of each unit is reduced.
12 ', the set of connecting plates 13', 1
In this embodiment, a socket 16 is suspended from the 3 'via a bracket 16' so as to have an energy absorbing function of an impact load due to the extension action of the wire rope 17.

In this embodiment, when an impact load is applied by an earthquake such that the main girders 4 and 4 move in mutually converging directions, the main girders 4 and 4 become narrower as indicated by arrows. Mutually interposed, and in this case, the main girder 4,
(4) There is a possibility that the ends of the unit collide with each other, causing serious damage. However, the impact load causes the wire rope 17 of the connecting device 9 'of each unit to be connected to the pair of connecting plates 13', 13 'by a link type. By acting to reduce the opening angle, and also when an impact load is applied, the wire rope 17
Is subjected to an elongation action in the same manner as in the above-described embodiment, and after the impact load is relieved to some extent by breaking, the connecting plate 1
3 'and the abdominal plate reinforcing plate 11 and the abdominal plate 10, so that the sudden application of a shocking load is reduced, and the energy absorbing performance of the connecting device 9' is improved. No brittle damage occurs as in the conventional embodiment. Therefore, no buffering occurs due to a collision due to an impact load at the edges of the main girders 4 and 4, and the function as a bridge is maintained and its durability is improved. Is achieved.

The embodiment of the invention of this application is not limited to the above-mentioned embodiment. For example, the anti-seismic connecting device interposed in the play area is of an expanding type with an open angle of the connecting plate, and Various modes can be adopted, such as arranging the reduced type in series at appropriate intervals.

[0019]

As described above, according to the invention of this application, a pair of connecting plates are basically linked in an earthquake-resistant connecting device structure provided for a gap between adjacent main girders in a bridge such as a steel viaduct. Connected to the formula via one lock bolt,
Also, by connecting the connecting plate to the abdominal plate reinforcing plate via other bolts, and by interposing a wire rope at the center of the pair of connecting plates of each unit, the main girders can be separated from each other. When doing, expanding the open angle of the link type connecting plate, or
The wire rope is subjected to an elongation effect through the reduction, and therefore, the impact load at the time of an earthquake is reduced by the elongation effect of the wire rope and the impact load to some extent, and the bolt and the connecting plate In addition, the impact load at the time of the earthquake is not immediately transmitted to the connecting plate, so that brittle damage such as tearing of the connecting plate or breakage of bolts is avoided, and the bridge functions as a bridge. An excellent effect that can be maintained is achieved.

In addition, when the expansion and contraction of the thermal behavior due to the temperature change of the adjacent main girder is reduced, the thermal behavior is absorbed by the pair of connecting plates of each unit being connected in a link manner. The effect that can be performed is produced.

[Brief description of the drawings]

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

FIG. 2 is an enlarged side view of a main part of another embodiment.

FIG. 3 is an enlarged schematic side sectional view of an upper portion of a bridge.

FIG. 4 is an enlarged side view of the top of the conventional coupling device.

FIG. 5 is a partial sectional view taken along line VV of FIG. 4;

[Explanation of symbols]

 4 Main girder 7 Free space 10 Belly plate 12 Other bolts 9 'Connecting device 12' Link bolt 17 Wire rope 13 'Connecting plate

Claims (3)

(57) [Claims] 1. A bridge girder seismic connection device structure in which a connecting plate is connected to an abdominal plate of a main girder via a bolt with respect to a play portion between adjacent main girders, wherein a pair of connecting plates are connected via a link bolt. the Joint Gap portion the pair of connecting plates connected to the web plate reinforcing plate of the main beam through another bolt with interconnects the Te
The coupling device 2 units and reams, of the each unit Thus
A seismic connection device for a bridge girder, wherein a wire rope is interposed and connected between a pair of link bolts of the connection device. 2. The method according to claim 1, wherein the pair of connecting plates include a link bolt and another bolt.
2. The structure according to claim 1 , wherein the connecting plates are connected in a link manner by wire ropes via the link bolts so as to reduce the opening angle between the connecting plates between the bridges. 3. The connecting plate according to claim 1, wherein the connecting plate is a link bolt.
And among the other bolts connecting plate mutual opening angle via the <br/> link bolt so as to be widened to a girder according to claim 1, characterized in that it is connected to the link type by wire rope Seismic connection device structure.