JP2000129629A - Steel damper device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steel damper device capable of being easily manufactured and controlling cost. SOLUTION: A damper device 1 provided between a girder 2 and a pier 3 is constituted of a first fixture 5A with an interlocking bar 5 fixed to the lower surface of the girder 2, a second fixture 6 fixed to the upper surface of a bridge 3, a mild steel pipe 7 with both ends borne on the second fixture 6 and a transferring member 8 fixed to a middle part of the steel pipe 7 and holding the interlocking bar 5. Then, when a severe earthquake occurs, the steel pipe 7 is deformed by strong vibration, the vibration transferred to the girder 2 is damped, and the falling of the girder 2 is controlled. Since vibration impact absorption is made by the mild steel pipe 7, a manufacturing cost can be controlled. The steel pipe 7 is provided to the second fixture 6 and transferring member 8 in a detachable manner, and the steel pipe 7 can be easily changed after the deformation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damper device which is deformed during an earthquake and suppresses the transmission of shaking to a support, thereby suppressing damage to the support.

[0002]

2. Description of the Related Art In general bridges such as road bridges and railway bridges, bridge supports using steel shoes have been used. However, since the Great Hanshin-Awaji Earthquake, the development of a damper device that reduces shaking in response to a rare strong earthquake and suppresses damage to a supporting object has been actively developed. As a developed damper device, a device using a lead column is known. In the case of using a lead column, when strong shaking occurs, the lead column is deformed to suppress the shaking transmitted to the support.

[0003]

The lead column is made by pouring molten lead into a mold. Lead is harmful and has the drawback that it can only be manufactured at pollution-manufacturing sites. In addition, the cost required for pollution control is added to the manufactured lead column, and as a result, the manufacturing cost of the damper device is increased.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a damper device which is easy to manufacture and can reduce the cost.

[0005]

The present invention employs the following technical means to achieve the above object. [Claim 1] A steel damper device is disposed between a first structure and a second structure.
A first fixed object fixed to a structure, a second fixed object fixed to the second structure, a soft iron steel pipe fixed to the second fixed object, the second fixed object and the steel pipe And a transmission member that is fixed to the steel pipe at a position distant from the fixing part and locks the first fixed object. In addition,
The first structure indicates one of the support and the load, and the second structure indicates the other of the support and the load.

According to a second aspect of the present invention, in the steel damper device of the first aspect, the second fixed member and the steel pipe, and the steel pipe and the transmission member are provided detachably. .

According to a third aspect of the present invention, in the steel damper device according to the second aspect, the second fixed member and the steel pipe are detachably provided by fastening means, and the steel pipe and the transmission member are fitted by fitting. It is characterized by being provided detachably by the engagement means.

According to a fourth aspect of the present invention, in the steel damper device according to any one of the first to third aspects, the transmission member has a substantially wrench head shape that sandwiches the first fixed object. The first fixed object sandwiched between the transmission members exhibiting a horizontal shape has a rod-like shape, and a portion sandwiched between the transmission members is provided in an R shape.

[0009]

[Operation and Effect of the Invention] The steel damper device comprises a first fixed member fixed to the first structure and a second fixed member fixed to the second structure. Is connected through a soft iron steel pipe that is relatively easy to deform, so that a strong shake is generated by the earthquake, and a difference due to the shake is generated between the first structure and the second structure. If
The steel pipe is deformed to attenuate the swing between the first structure and the second structure.

[0010] The steel pipe, which attenuates the shaking by deformation, is made of soft iron and therefore is harmless to the human body, and can be manufactured even at a production site where no measures against pollution are in place. In other words, a steel damper device can be easily created in an ordinary ironworks or the like that can weld or cut an iron material. In addition, since the steel damper device does not suffer from the problem of adding the cost required for pollution control, the manufacturing cost can be reduced.

[Functions and Effects of Claims 2 and 3]
Since the second fixed object and the steel pipe and the steel pipe and the transmission member are provided detachably, when the steel pipe is deformed due to an earthquake or the like, the deformed steel pipe can be easily replaced. In other words, when it is not possible to attach and detach the steel pipe, it is necessary to replace the deformed steel pipe together with the second fixed object, which increases the cost and is heavy and poor in workability. By adopting this, the replacement cost can be reduced and maintenance workability is improved.

The first fixed object has a rod shape extending in the horizontal direction, and the transmission member has a substantially wrench head shape and employs a structure for sandwiching the first fixed object. The device is configured to swing in a direction orthogonal to the longitudinal direction of the first fixed object (difference between the first structure and the second structure).
Can only be attenuated.

The first fixed object sandwiched between the transmission members is R
By providing the shape, even when the steel pipe is deformed and the transmission member rotates, the increase in the gap between the first fixed object and the transmission member can be suppressed. When this gap increases, the first fixing member and the transmission member collide with each other due to the gap and generate an impact when a strong earthquake occurs. However, since the increase in the gap is suppressed, the collision between the first fixed object and the transmission member can be suppressed and the impact can be suppressed when a strong earthquake occurs.

[0014]

Next, embodiments of the present invention will be described based on examples and modifications. [Structure of Embodiment] An embodiment will be described with reference to FIGS. 1 is a front view and a bottom sectional view showing an arrangement state of a steel damper device, FIG. 2 is an exploded perspective view of a lower structure of the damper device, FIG. 3 is a front sectional view of the damper device, and FIG.
FIG. 5 is a side view of the damper device, and FIG. 5 is an operation explanatory view of the damper device.

The steel damper device 1 is for seismically isolating and supporting a girder 2 (an example of a load, corresponding to a first structure).
A girder 2 and a pier 3 supporting the girder 2 (an example of a support,
(Corresponding to the second structure). The damper device 1 is disposed separately from the rubber bearing 4 that receives the load of the spar 2, and includes a first fixed object 5 fixed to the spar 2,
A second fixed member 6 fixed to the pier 3;
Steel tube 7 made of soft iron and fixed to the second fixed object 6 and steel tube 7
And a transmission member 8 which is fixed to the steel pipe 7 at a position distant from the fixing part and which is locked to the first fixed object 5, and the surface of which is subjected to rust prevention treatment.

The fixation between the second fixed object 6 and the steel pipe 7 and the fixation between the steel pipe 7 and the transmission member 8 can be released and can be detachably provided. Specifically, as shown in FIG. 2 and FIG.
The steel plate 6A welded to the fixed object 6 and the steel plate 7A welded to the outer end of the steel pipe 7 are connected by fastening means 9 using bolts and nuts.
It is provided detachably. Further, the steel pipe 7 and the transmission member 8 are engaged by fitting a rectangular convex insertion member 7B welded to the inner end of the steel pipe 7 with a rectangular hole insertion hole 8A provided in the transmission member 8. It is provided detachably by the combining means 10.

The first fixed member 5 is a steel member firmly fixed to the lower surface of the spar 2 by an anchor bolt 11 or the like, and has an engaging bar 5A oriented in a horizontal direction orthogonal to the spar axis. The engagement bar 5A is provided with an R-shaped portion sandwiched between the transmission members 8, so that even if the steel pipe 7 is deformed and the transmission member 8 is rotated (see FIG. 5), the first engagement bar 5A can be used. The increase in the gap between the fixed object 5 and the transmission member 8 is suppressed. The second fixed member 6 is a steel member firmly fixed to the upper surface of the pier 3 by an anchor bolt 12 or the like, and firmly supports both ends of the steel pipe 7 oriented in the horizontal direction orthogonal to the girder axis by welding.

The steel pipe 7 is made of a soft iron (specifically, a very low yielding steel having a high shear deformation capacity) provided in a cylindrical shape, and has a deformation capacity depending on the thickness, thickness and length of the pipe. Is set. The transmission member 8 is located at an intermediate portion of the steel pipe 7 (at a position away from a portion where the second fixed member 6 and the steel pipe 7 are fixed).
The fixing member is firmly fixed by a welding technique, and has a substantially spanner head shape sandwiching the engagement bar 5A of the first fixed object 5.

[Operation of the Embodiment] When a strong earthquake of the Great Hanshin-Awaji Earthquake class occurs, the steel pipe 7 made of extremely low yielding steel plate is deformed, and the shaking in the girder axial direction transmitted from the pier 3 to the girder 2 is attenuated. As a result, damage to the girder 2 such as the girder 2 falling from the pier 3 is suppressed, and occurrence of a secondary disaster due to damage to the girder 2 can be suppressed. Further, after the steel pipe 7 is deformed, by removing the fastening means 9, the deformed steel pipe 7 can be easily removed, and a new steel pipe 7 can be easily replaced.

[Effects of the Embodiment] The damper device 1 is made of iron (the first and second fixed members 5, 6 and the transmission member 8 are made of steel.
Since the steel pipe 7 is made of soft iron), it can be manufactured even at a production site where pollution control measures are not prepared. That is, the damper device 1 can be easily created by a normal ironworks or the like that can perform welding and cutting. Since the damper device 1 does not suffer from the problem of adding the cost required for pollution control, the manufacturing cost of the damper device 1 can be suppressed lower than that using a conventional lead column. In addition, since a very low yielding steel plate having high shear deformation performance is used for the steel pipe 7 that dampens shaking, a high damping effect can be obtained, and high durability and reliability can be obtained.

When the steel pipe 7 is deformed due to an earthquake or the like, by removing the fastening means 9, the deformed steel pipe 7 can be easily removed and a new steel pipe 7 can be easily replaced. Steel pipe 7
Only the steel plate (including the steel plate 7A and the insertion member 7B) can be replaced, so that the replacement cost can be reduced and
Work weight can be made relatively light and workability is excellent.

The engaging bar 5A of the first fixed member 5 has a rod shape extending in the horizontal direction orthogonal to the girder axis, and the transmission member 8 has a substantially spanner head shape and employs a structure that sandwiches the engaging bar 5A. For this reason, the damper device 1 does not act in the direction orthogonal to the girder axis, attenuates only shaking in the girder axis direction, and can prevent the girder 2 from dropping when an earthquake occurs.

Since the engagement bar 5A of the first fixed object 5 sandwiched between the transmission members 8 is provided in an R shape, even if the transmission member 8 rotates (see FIG. 5), the first fixed object 5 and the first fixed object 5 are transmitted. An increase in the gap with the member 8 is suppressed. When this gap increases, the first fixed object 5 and the transmission member 8 collide with each other due to the gap and generate a strong impact when a strong earthquake occurs. However,
When a strong earthquake occurs, the first
The collision between the fixed object 5 and the transmission member 8 can be suppressed, and the impact can be suppressed.

[Modification] In the above embodiment, an example was shown in which the first fixed object 5 was fixed to the mounted object, and the second fixed object 6 was fixed to the support object. The second fixed object 6 may be fixed to a supporting object while being fixed to a supporting object. Although the pier 3 is shown as an example of the support, it may be applied to another lower support such as an abutment. Although the girder 2 is shown as an example of the mounted object, the present invention may be applied to other building structures, civil engineering structures, and the like, such as buildings and steel towers. In the above embodiment, an example in which a cylinder is used as the steel pipe 7 has been described. However, a steel pipe 7 having another shape such as a rectangular pipe may be used.

[Brief description of the drawings]

FIGS. 1A and 1B are a front view and a cross-sectional view as viewed from below, showing an arrangement state of a damper device.

FIG. 2 is an exploded perspective view of a lower structure of the damper device.

FIG. 3 is a front sectional view of the damper device.

FIG. 4 is a side view of the damper device.

FIG. 5 is an operation explanatory view of the damper device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Damper apparatus 2 Girder (1st structure) 3 Bridge pier (2nd structure) 5 1st fixed object 5A Locking bar (1st fixed object sandwiched between transmission members) 6 2nd fixed object 7 Steel pipe 8 Transmission member 9 Fastening means 10 Engaging means

Claims (4)

[Claims] 1. A steel damper device disposed between a first structure and a second structure, wherein the first structure is fixed to the first structure, and the second structure is fixed to the second structure. A fixed second fixed object, a soft iron steel pipe fixed to the second fixed object, and fixed to the steel pipe at a position away from a fixing portion of the second fixed object and the steel pipe, And a transmission member for locking the first fixed object. 2. The steel damper device according to claim 1, wherein the second fixed member and the steel pipe, and the steel pipe and the transmission member are provided detachably. 3. The steel damper device according to claim 2, wherein said second fixed object and said steel pipe are detachably provided by fastening means, and said steel pipe and said transmission member are attached and detached by engaging means by fitting. A steel damper device provided so as to be capable of being provided. 4. The transmission member according to claim 1, wherein the transmission member has a substantially spanner head shape sandwiching the first fixed object, and the transmission member has a spanner head shape. The steel damper device, wherein the first fixed object to be sandwiched has a rod shape extending in a horizontal direction, and a portion to be sandwiched by the transmission member is provided in an R shape.