Mitsubishi Hitachi Power Systems, Ltd.

Masaki Shimono

Motoki Kato

Kunihiro Morishita

Yuji Kuroda

Keiichi Moritsuka

Tatsuya Amano

The boiler () according to an aspect of the present invention is provided with a boiler main body () and a steel support frame () that suspends and supports the boiler main body (). The boiler main body () is provided with: a furnace wall () composed of water pipes () and plate-like fins () arranged in an alternating manner; an internal element () housed inside the furnace wall (); and a buffering mechanism () configured to attenuate vibration energy when relative displacement, of the internal element () with respect to the furnace wall (), occurs that exceeds a predetermined value. The buffering mechanism () is disposed between the furnace wall () and the internal element () in the main vibration direction of the internal element (), and the load on the buffering mechanism () caused by interference is transmitted to the fins ().

Boiler

A structure for seismic isolationprovided on a structure planeincluding a pair of left and right columnsspaced apart in a horizontal direction, and a pair of upper and lower beamsA,B spaced apart in a vertical direction, wherein the structure for seismic isolation comprises: a seismic isolation deviceprovided in a middle of each of the columnto be displaced toward the beamA; and a horizontal rigid bearing element that is provided between an area in which the seismic isolation deviceis provided and the beamB and that includes a connection beamconnecting the pair of columnsand vertical bracesL,R.

Structure for seismic isolation, steel support structure, and method for seismic isolation of existing steel support structures

In a boiler support structure in which certain seismic isolators are provided with a pullout countermeasure, the seismic isolators to be provided with the pullout countermeasure are individually identified according to whether the seismic isolator satisfies Formula (1): N+N&#x3e;N. . . Formula (1), where N(N&#x3c;0) is a compressive load occurring on each of the seismic isolators and calculated on the basis of a permanent load imposed on the boiler support structure; N(N&#x3e;0) is a pullout force occurring on each of the seismic isolators and calculated on the assumption that an earthquake has occurred; and N(N&#x3e;0) is an allowable pullout force of each of the seismic isolators and calculated using an allowable pullout stress of each of the seismic isolators.

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Tokyo, Japan

Masaki Shimono