JPS599828B2 - Earthquake-resistant equipment for furnace structures - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an earthquake-resistant device for furnace structures such as blast furnaces, coke dry fire extinguishing furnaces, and the like.

Regarding the seismic resistance of composite structures of furnace bodies and frames such as blast furnaces and coke dry fire extinguishing furnaces, the interaction between heavy and rigid furnace bodies and lightweight and flexible frames is a problem currently under research. According to the results of actually observing the conditions during an earthquake in a blast furnace, deformation occurs as shown in Figure 1, A.

In other words, the furnace structure composed of the furnace body 1 in FIG. Deformation as shown above occurred, and a noticeable whipping phenomenon was observed especially in the furnace top steel frame 30, and it is assumed that such a phenomenon is caused by uneven rigidity.

Regarding the peculiar phenomenon of the above-mentioned furnace structure, which consists of a rigid and heavy furnace body and a relatively lightweight and soft framework,
This is difficult to achieve with static design based on the static vibration method.

In other words, in order to change the stiffness distribution of the blast furnace, the structure of the blast furnace must be drastically changed, which is expensive and difficult. I have to be able to do it.

This invention provides an earthquake-resistant device with excellent seismic response without changing the furnace structure by a simple means to solve the problems in the prior art described above. A seismic damper in which a soft metal is arranged on the outer periphery via a plurality of rollers is provided at the point of contact with the supporting frame, and the difference in vibration displacement that occurs between the two at the time of an earthquake is converted into torque by the seismic damper, The torque is absorbed by utilizing the assisted yielding caused by the torque.

Next, the present invention will be explained with reference to examples and drawings.

2 to 6 show an embodiment of the seismic device of the present invention, in which FIG. 2 is a side view, FIG. 3 is a plan view, and FIGS. 4 and 5 are partially enlarged side views. FIG. 6 is a plan view showing another embodiment of the present invention.

In the drawing, 1 is a furnace body, 3 is a frame, and on the furnace body side of the frame 3, a plurality of pairs of brackets 4, 4' are provided around the furnace body 1.

Reference numeral 5 denotes a shaft fitted between the brackets 4 and 4', and a soft metal 7 such as lead is placed on the outer periphery of the shaft 5 via a plurality of rollers 6, forming an earthquake-resistant damper A. .

8 is an arm extending from the soft metal 7 toward the furnace body 1;
The end of the arm 8 is fixed to the furnace body 1.

As a result, when an earthquake occurs, a large shearing force Q is applied to the shaft 5 due to the separate deformation of the furnace body 1 and the framework 3, and potential energy corresponding to the shearing force Q is generated within the framework 3. However, since the seismic damper A made of soft metal 7 is interposed around the shaft 5, the shear force Q changes to torque, and the seismic damper At point A, energy absorption is achieved, and as shown in FIG. 7, stable hysteresis is shown with respect to torque T and rotation angle θ.

The one shown in FIG. 6 is another embodiment of the present invention, in which a pendulum 9 having a weight 9' is provided below the seismic damper A having the above-described structure. It is not necessary to use a material that absorbs a large amount of energy, and the pendulum 9 prevents energy transmission between the furnace body 1 and the frame 3, resulting in a seismic isolation type seismic device.

As explained above, according to the device of this invention, by using a simple seismic damper at the contact point between the furnace body and the frame structure, seismic energy can be reliably absorbed or blocked, and Without having to completely remodel things,
It is possible to create a structure with excellent earthquake resistance.

[Brief explanation of drawings]

Figure 1A is a side view showing the deformation of the reactor structure during an earthquake in the prior art; Figure 2 is a partial side view of the device of this invention;
3 is a partial plan view, FIGS. 4 and 5 are a partially enlarged side view and a plan view showing essential parts of the invention, FIG. 6 is a side view showing another embodiment of the invention, and FIG. The figure is a graph showing the hysteresis of torque and rotation angle at the contact point between the furnace and the framework. In the drawings, 1...Furnace body, 2...Base, 3...
Frame, 4... Bracket, 5... Shaft, 6... Roller, 7... Soft metal, 8... Arm, 9... Pendulum.

Claims (1)

[Claims] 1. A seismic damper, in which soft metal is arranged around the outer periphery of the furnace body through a plurality of rollers, is installed at the contact point between the furnace body and the framework that supports the furnace body, and is used to dampen the difference in vibration displacement that occurs between the two when an earthquake occurs. An earthquake-resistant device for a furnace structure, characterized in that the earthquake resistance damper converts the torque into torque, and absorbs the torque by utilizing shear yield generated by the torque.