JPS5854287A - Earthquake-proof device for ceramics member - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a seismic isolation device suitable for constructing a long ceramic material such as a ceramic pipe.

Although the applications of ceramics are limitless, one drawback that often limits their use is that they are brittle materials. In particular, long ceramic members are extremely weak against bending force.

As an example of long ceramics, there are many applications in which long ceramic tubes are used, and specific examples include fluid transportation and heat exchanger tubes. In other words, furnace core tubes for atmosphere adjustment in electric furnaces and gas furnaces that transport high-temperature fluids may be required to have a length of 2 m or more, and heat exchange heat transfer tubes for heat recovery may be required. The same applies to the use as

When using these pipes, compensation for relative thermal displacement between the two ends can be determined relatively easily, but the relative displacement between the pipe and its support during rapid vibrations such as earthquakes can be determined relatively easily. Almost no effective measures have been taken to deal with such displacement. In particular, if the ceramic tube is long or large, the tube itself including the attached members has a considerable mass, so it is difficult to react in the same manner to vibrations of the structure supporting the ceramic tube. (Both ends cannot be fixed in order to compensate for the relative displacement caused by heat between the tube and the support.) In fact, if a ceramic tube is as long as 8 m, it is usually
Sentence for bending between both ends of about 6 pieces! It is often destroyed.

The present invention was discovered as a result of various studies in view of these points, and has succeeded in developing a seismic isolation device that does not generate large bending stress in ceramics or requires very little bending stress even during earthquakes. It is.

That is, the present invention provides an arrangement in which a ceramic member is framed on a structure, a hydraulic cylinder device is provided fixed to the framed structure, and the ceramic member is directly attached to one end of the piston of the hydraulic cylinder device. Or, it can be connected indirectly, and the chambers on both sides of the piston in the hydraulic chamber of the hydraulic cylinder device are connected with a conduit having a thin tube or a small hole.
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The present invention will be explained below with reference to the drawings.

In FIGS. 1 and 2, the heat transfer iF1.1' made of elongated ceramic has one end 1a.

1'a is the lower structure 2 (sometimes a flue,
It may also be the frame of a heat exchanger. ) with a communication duct 8 and fixed, and the other end 1 b , 1'b
An elastic heat insulating material 4 is interposed in the upper structure 2' to form a support frame that can be freely expanded and contracted.

In the drawing, the gas to be heated flows in the direction indicated by the arrow, and is heated and heat-exchanged in the flue 5 through which the high-temperature gas passes.

In the method of using such long ceramic tubes, the present invention provides a hydraulic cylinder device in a structure 2' that frames the ceramic tubes 1b, 1'b.

This hydraulic cylinder device is fixed to a structure at a position where the tip of a piston rod C can be connected to a ceramic tube.

The hydraulic cylinder device will be explained with reference to FIG. The hydraulic cylinder device 8 includes a main body 10 having a hydraulic chamber 9 therein, a piston 11, a piston rod 6, and a conduit section 12.
In the conduit portion 12, a thin tube 18 through which liquid moves is formed so as to communicate with the chambers ga, gb on both sides of the piston 11. (Instead of the thin tube 18, the same purpose as 6 can be achieved by forming a small hole corresponding to the thin tube in a part of the conduit. Also, the cross-sectional shape and diameter of the thin tube and orifice (This is determined by the mass of the ceramic tube including the attached parts, the cylinder diameter and number of hydraulic cylinders, etc.)・Here, we will explain the effect of installing such a hydraulic cylinder device. . First, if a sudden force such as an earthquake is applied to the structure and, for example, the structure 2' shakes in the direction of arrow B in FIG. As shown in the figure, it swings in the direction of arrow B.

On the other hand, ceramic tubes have difficulty responding to the vibrations immediately due to their inertia, so they would normally be subject to bending stress, but with the addition of this device, a piston acts, and the ceramic tube is the same as the structure. Since it is possible to give a sway in the direction, the stress on the ceramic tube can be alleviated.

That is, if the piston 11 remains stationary even when the cylinder device 8 swings in the direction of the arrow, the liquid in the hydraulic chamber 9b will be rapidly sent into the hydraulic chamber 9a through the thin tube 18 or the orifice. However, 1. The thin tube or orifice has an extremely small diameter calculated from the design, so it can be
When the flow velocity is very high, the differential pressure between the two hydraulic pressure chambers is very large, and the hydraulic pressure chamber 9b instantly becomes like a rigid body.

Therefore, the piston is moved in the direction of arrow B, and the structure and the ceramic tube swing together as one with almost no relative displacement.

In this way, the piston acts in this way for sudden relative displacements such as earthquakes, but for less sudden relative displacements of the upper and lower part of the flue, in such hydraulic cylinders, the piston acts in a thin tube or orifice. Since the velocity of flow is small, almost no differential pressure is generated between the two hydraulic pressure chambers, and almost no stress is generated in the ceramic tube.

As described above, in the present invention, even if the ceramic member is long, sudden relative displacement does not occur and excessive bending stress is not generated in the ceramic, so durability and
Safety is improved and the use of ceramics can be expanded, and its industrial value is enormous.

In order to alleviate such a sudden displacement of the ceramic member in the horizontal plane in both the x and y axes, the head of the hydraulic cylinder device must be rotated at an angle of X as shown in Fig. 2.

This can be solved by providing an appropriate number of devices with appropriate capabilities at appropriate positions, such as attaching them to both the Y-axis.

[Brief explanation of the drawing]

FIG. 1 is a partially cross-sectional front view illustrating an example of the device of the present invention, FIG. 2 is a plan view illustrating an example of the arrangement of the cylinder device, and FIG. 8 is a longitudinal sectional view illustrating the cylinder device. . In the drawings, 1 is a ceramic tube, 2 is a structure, 4 is a heat insulating buffer block, and 8 is a hydraulic cylinder device. sai fq sai 27i4 sai 3 drawings

Claims (1)

[Claims] L: In a device in which a ceramic member is framed on a structure, a hydraulic cylinder device is provided fixed to the framed structure, and a ceramic member is attached to one end of a piston of the hydraulic cylinder device. A seismic isolation device for ceramic members, in which the members can be connected directly or indirectly, and the chambers on both sides of the piston in the hydraulic chamber of a hydraulic cylinder device are connected by a conduit having a thin tube or a small hole. 2. The ceramic member is made of long ceramics,
The other end of the ceramic is fixed at one end and supported with a degree of freedom at the other end, and is supported with a degree of conspicuousness when the fruit parts to which both ends are fixed or supported are subjected to sudden vibrations at the same time. 2. The seismic isolation device according to claim 1, wherein a hydraulic cylinder device is fixed to the other end of the elongated ceramic so that the other end of the elongated ceramic vibrates in the same direction as the structure.