WO2018230014A1

WO2018230014A1 - Elastic-plastic element, seismic tie comprising same, and boiler support structure

Info

Publication number: WO2018230014A1
Application number: PCT/JP2017/045078
Authority: WO
Inventors: 森川　昭二; 清相田; 幸太郎河村; 邦宏森下; 基規加藤; 将樹下野
Original assignee: 三菱日立パワーシステムズ株式会社
Priority date: 2017-06-12
Filing date: 2017-12-15
Publication date: 2018-12-20
Also published as: JP6805085B2; JP2019002595A

Abstract

Provided are an elastic-plastic element that ensures fatigue strength to be able to withstand repeated vibrations and that can improve durability, a seismic tie comprising same, and a boiler support structure. An elastic-plastic element (3) used in an insertion type seismic tie (110) is provided with a rhomboid opening (30A) in the body (30) and has a pair of first shoulders (31) and a pair of second shoulders (32) that extend so as to expand outward as same nears one end face (3AE) and the other end face (3BE) from both side faces along the length direction of the body (30) or from both the front and back faces in the thickness direction. The separation distance from end point positions (310) of the expansions of the first shoulder (31) and the second shoulder (32) to the one end face (3AE) and the other end face (3BE) is set to be larger than the separation distance from a first vertex (301) and a second vertex (302) to the one end face (3AE) and the other end face (3BE).

Description

Elasto-plastic element, seismic tie including the same, and boiler support structure

The present invention relates to an elastoplastic element, a seismic tie including the same, and a boiler support structure.

A boiler support structure that supports a boiler body in which a heat exchanger such as a economizer, an evaporator, and a superheater is mounted by suspending the boiler body from an upper part of a support structure formed of a plurality of support steel frames. Are known. In such a boiler support structure, for example, when a vibration such as an earthquake occurs, the boiler body repeatedly shakes so as to perform a pendulum motion, so that the relative displacement between the boiler body and the support structure is limited to the limit. Seismic ties are used as a steady rest for the purpose.

For example, in Patent Document 1 and Patent Document 2, one end of a plurality of elastoplastic elements having variable cross-sections that become iso-stressed beams is fixed to a backstay provided on the water wall of the boiler body at a predetermined interval, and the other end Is attached to a rigid binder member, and a sandwich type seismic tie is disclosed in which a support member or its extension member is sandwiched from both sides with a predetermined gap.

This seismic tie elasto-plastic element has a rectangular plate with a roughly diamond-shaped opening, and the section modulus varies depending on the position (variable section). The elastic-plastic element and each of the backstay and the binder member are fixed to each other by overlay welding.

Japanese Patent No. 3181371 JP-A-9-112805

However, in the seismic ties described in Patent Document 1 and Patent Document 2, one end of an elastic-plastic element, which is a single elastic-plastic body as a whole, is used as a backstay, and the other end is used as a binder member. For this reason, the toe portion of the build-up welded portion is formed unevenly, and stress concentrates at the toe portion. Furthermore, since the stress concentration factor changes due to the generation of residual stress due to build-up welding or the formation of a non-uniform build-up shape, the stress determined at the build-up weld is unlikely to occur, and there is a difference in strength depending on the position in the elastic-plastic element. It will come out.

Therefore, for example, when repeated vibrations such as a large earthquake occur, the build-up welded part becomes the weakest part and fatigue failure is likely to occur, and the inherent strength of the elastic-plastic member constituting the elastic-plastic element It was difficult to use until.

Accordingly, the present invention provides an elastic-plastic element capable of ensuring fatigue strength that can withstand repeated vibration and improving durability, a seismic tie including the same, and a boiler support structure. With the goal.

In order to achieve the above-mentioned object, a representative present invention is for restricting relative displacement due to vibration between a boiler body installed along a vertical direction and a support structure for supporting the boiler body. Used in a sandwich type seismic tie, one end surface along the width direction of the rectangular plate-shaped main body is welded to the boiler body side, and the other end surface along the width direction is welded to the support structure side. An elastic-plastic element, wherein a rhombus-shaped opening is provided in a central portion of the main body, a first top portion of the opening is disposed on the one end surface side, and a second top portion of the opening is disposed on the other end surface side. And a pair of first shoulders projecting outward from the both side surfaces along the length direction of the main body or both front and back surfaces in the thickness direction toward the one end surface, and the main body Length A pair of second shoulders projecting outwardly from the both side surfaces along the thickness direction or both the front and back surfaces in the thickness direction toward the other end surface, and expansion of the first shoulder portion The separation length from the end point position to the one end surface is set to be larger than the separation length from the first top portion to the one end surface, and the separation distance from the enlargement end point position to the other end surface in the second shoulder portion. The length is set larger than the separation length from the second top to the other end surface.

According to the present invention, the above characteristics can ensure fatigue strength that can withstand repeated vibrations and improve durability. Problems, configurations, and effects other than those described above will be clarified by the following description of the embodiments.

It is the schematic which shows an example of the structure of the boiler apparatus with which this invention is applied. It is a perspective view which shows one structural example of the seismic tie which concerns on 1st Embodiment. It is a top view which shows one structural example of the elastic-plastic element which concerns on 1st Embodiment. The elastic plastic element which concerns on 1st Embodiment shows the state joined to each of a backstay and a binder member, an upper figure is a top view, a center figure is a side view, and a lower figure is the AA line in an upper figure It is sectional drawing. FIG. 5A is a graph showing the relationship of stress to the position in the length direction of the elastic-plastic element according to the first embodiment, and FIG. 5B is a graph showing the relationship of stress to the position in the length direction of the elastic-plastic element of the conventional structure. It is. The elastic plastic element which concerns on 2nd Embodiment shows the state joined to each of a backstay and a binder member, an upper figure is a top view, a center figure is a side view, a lower figure is the BB line in an upper figure It is sectional drawing. It is a figure which shows the example of 1 structure of the seismic tie which concerns on 3rd Embodiment.

<First Embodiment>
A first embodiment of the present invention will be described with reference to FIGS.

(Configuration of boiler device 1)
First, the whole structure of the boiler apparatus 1 to which this invention is applied is demonstrated with reference to FIG.

FIG. 1 is a schematic diagram showing an example of the structure of a boiler apparatus 1 to which the present invention is applied. In the following description, a direction parallel to the ground on which the boiler device 1 is installed is referred to as a “horizontal direction”, and a direction orthogonal to the horizontal direction is referred to as a “vertical direction”.

The boiler device 1 is a large boiler device installed in a thermal power plant, for example. The boiler device 1 includes a boiler body 10 installed along the vertical direction and a support structure 11 for supporting the boiler body 10.

The boiler body 10 includes a furnace for burning fuel such as fossil fuel, and a heat exchanger such as a economizer, an evaporator, and a superheater, and surrounds it with a water wall 101 (see FIG. 2). It has a housing structure.

The support structure 11 is suspended by a support steel 111 as a plurality of support pillars that support the boiler body 10 and a support steel 111 arranged at an upper portion of the plurality of support steels 111 in the vertical direction, and the boiler body 10 is suspended. A plurality of suspending members 112 to be lowered and a plurality of sandwich type seismic ties 110 for limiting relative displacement due to vibration between the boiler body 10 and the support structure 11 are provided.

When a plurality of seismic ties 110 cause horizontal relative displacement between the boiler body 10 and the support structure 11 (support steel 111) due to vibration such as an earthquake, for example, vibration energy corresponding to the amount of displacement is obtained. Is a steadying device for protecting pipes and ducts connected to the boiler body 10.

(Configuration of Seismic Tie 110)
Next, a specific configuration of seismic tie 110 will be described with reference to FIGS.

FIG. 2 is a perspective view showing a configuration example of the seismic tie 110 according to the first embodiment. FIG. 3 is a plan view showing a configuration example of the elastic-plastic element 3. FIG. 4 shows a state in which the elastoplastic element 3 is joined to each of the backstay 102 and the binder member 2, the upper view is a plan view, the center view is a side view, and the lower view is AA in the upper view. It is line sectional drawing. FIG. 5A is a graph showing the relationship of stress to the position in the length direction in the elastic-plastic element 3 according to the first embodiment, and FIG. 5B is the relationship of stress to the position in the length direction in the elastic-plastic element having the conventional structure. It is a graph which shows. In FIG. 5A and FIG. 5B, the nominal nominal stress is indicated by a two-dot chain line (thick solid line in the portion overlapping with the stress of the actual machine shape), and the stress of the actual machine shape is indicated by a thick solid line.

As shown in FIG. 2, the water wall 101 of the boiler body 10 has a horizontal direction parallel to the water wall 101 and intersecting (orthogonal to) the vertical direction (in FIG. 2, the front-rear direction of the boiler body 10). A backstay 102 as a reinforcing member extending in the direction is fixed. A seismic tie 110 is provided in the vicinity of the center of the water wall 101 of the boiler body 10 so as to connect the backstay 102 and the supporting steel frame 111.

A seismic tie 110 shown in FIG. 2 includes a support steel 111 (for example, support steel 111V) extending in the vertical direction among the plurality of support steels 111 shown in FIG. 1 and a backstay extending in the front-rear direction of the boiler body 10. 102.

Seismic tie 110 includes a backstay between a pair of binder members 2 that sandwich support steel frame 111 with a predetermined gap from the extending direction (front-rear direction) of backstay 102, and backstay 102 and a pair of binder members 2. A plurality of (eight in the present embodiment) elasto-plastic elements 3 arranged at predetermined intervals along the extending direction 102 and a tie plate 4 for connecting the pair of binder members 2 are provided. .

In the present embodiment, each of the pair of binder members 2 sandwiches the supporting steel frame 111 with a predetermined gap from the extending direction of the backstay 102, but this is not always necessary, and a binder member having another configuration is used. The configuration of the seismic tie will be described in a third embodiment described later.

The elastic-plastic element 3 has a rectangular plate-shaped main body 30 formed of an elastic-plastic member such as a steel material. Between the boiler main body 10 and the support steel 111 (support structure 11) due to vibration such as an earthquake. When a relative displacement occurs, it is bent into a shear type and elastically deforms to absorb vibration energy.

As shown in FIG. 4, the elastic-plastic element 3 has an end surface 3AE (one end portion 3A) along the width direction of the main body 30 on the backstay 102 (boiler main body 10 side) and the other along the width direction of the main body 30. End face 3BE (other end part 3B) is joined to a pair of binder members 2 (support structure 11 side), respectively, by overlay welding.

As shown in FIG. 2, in this embodiment, four of the eight elastoplastic elements 3 are joined together to one binder member 2 and the remaining four elastoplastic elements 3 are joined together. The binder members 2 are joined together.

Each of the pair of binder members 2 has such rigidity that the opposing surfaces can be kept parallel to the backstay 102 even when the elastic-plastic element 3 is deformed by vibration such as an earthquake.

As described above, in the present embodiment, the pair of binder members 2 sandwich the supporting steel frame 111 from the horizontal direction (front-rear direction) and are connected to each other by the tie plate 4, so that the boiler body 10 is in the horizontal direction. Even when a relative displacement is generated between the pair of binder members 2 and the supporting steel frame 111 due to vibration to the supporting steel frame 111, a relative displacement exceeding a predetermined gap formed in advance may occur. Absent. Therefore, the pair of binder members 2 and the supporting steel frame 111 can be regarded as an integral body, and most of the relative displacement between the boiler body 10 and the supporting steel frame 111 is the amount of deformation of the elastic-plastic element 3. The amount of deformation is the same in all of the plurality of elastic-plastic elements 3.

The elastic-plastic element 3 includes a pair of first shoulder portions 31 projecting from the both side surfaces along the length direction of the main body 30 toward the one end surface 3AE, and both side surfaces along the length direction of the main body 30. And a pair of second shoulder portions 32 projecting so as to expand toward the other end surface 3BE. The “length direction” of the main body 30 indicates a direction that intersects (orthogonally) the width direction and the thickness direction in the main body 30.

In the present embodiment, the first shoulder 31 has a curved surface so as to draw an arc from the start point 311 to the end point 312 of the enlargement and from the start point 321 to the end point 322 of the second shoulder 32. linked.

It should be noted that the pair of first shoulder portions 31 and the pair of second shoulder portions 32 are not necessarily formed so as to protrude outward from both side surfaces along the length direction of the main body 30. Other examples will be described in a second embodiment to be described later.

The main body 30 is formed with a rhombus-shaped opening 30 </ b> A penetrating in the thickness direction at the center for forming a variable cross section to be an iso-stress beam. In the present embodiment, all of the four top portions 301 to 304 of the opening 30A are curved in an arc shape.

The four top portions 301 to 304 are such that the first top portion 301 and the second top portion 302 are opposed to each other in the length direction at the center in the width direction of the main body 30, and the third top portion 303 and the fourth top portion are the length of the main body 30. It arrange | positions facing the width direction in the center part of the direction. In addition, the 1st top part 301 is arrange | positioned at the one end surface 3AE side, and the 2nd top part 302 is arrange | positioned at the other end surface 3BE side.

The first top portion 301 is located closer to the one end surface 3AE than the expansion end point position 312 in each of the pair of first shoulder portions 31, and the second top portion 302 is expanded in each of the pair of second shoulder portions 32. Is located closer to the other end surface 3BE than the end point position 322.

That is, as shown in FIG. 3, the separation length D12 from the enlargement end point 312 to the one end surface 3AE in the first shoulder 31 is set to be larger than the separation length D11 from the first top portion 301 to the one end surface 3AE. (D12> D11). Similarly, the separation length D22 from the enlargement end point position 322 to the other end surface 3BE in the second shoulder portion 32 is set larger than the separation length D21 from the second top portion 302 to the other end surface 3BE (D22>). D21).

Therefore, the shaded portion shown in FIG. 3 (the region having distances D11 and D21 in the length direction) is defined as a “rigid region” with respect to an “elasto-plastic region” where stress for forming an equal strength beam is generated. Can be considered. The stress generated in the “rigid body region” is sufficiently smaller than the stress generated in the “elastic-plastic region”. The “elastic-plastic body region” in the elasto-plastic element 3 corresponds to the white portion shown in FIG.

And as shown in FIG. 4, the toe part 41E of the build-up welding part 41 of the one end part 3A and the backstay 102 is located between one end surface 3AE and the 1st top part 301 in the length direction. The toe end portion 42E of the build-up weld portion 42 between the other end portion 3B and the binder member 2 is located between the other end surface 3BE and the second top portion 302 in the length direction. That is, the build-up

welds

41 and 42 are formed in a “rigid region” corresponding to the hatched portion shown in FIG.

In the elastic-plastic element having a rectangular shape in which the pair of first shoulder portions 31 and the pair of second shoulder portions 32 are not formed, as shown in FIG. A large stress peak occurs with respect to the nominal stress. Therefore, in the elasto-plastic element having a conventional structure, damage tends to concentrate on the build-up weld with the toe portion as a base point.

On the other hand, in the elastic-plastic element 3 according to the present embodiment, as shown in FIG. 5A, the stress peaks at the toe portions 41 </ b> E and 42 </ b> E of the build-up

welds

41 and 42 are relative to the nominal stress. small. That is, in the built-up

welds

41 and 42 that are structurally discontinuous portions, the magnitude of the value obtained by multiplying the stress generated in the “elastic-plastic region” by the stress concentration factor is generated in the “elastic-plastic region”. Under the stress, the build-up

welds

41 and 42 do not become the weakest part in the elastic-plastic element 3.

Thereby, for example, fatigue failure due to repeated vibration due to a large earthquake or the like is not concentrated on the build-up

welds

41 and 42 but is distributed in the “elasto-plastic region”. It is possible to use up to the strength inherent in the elastic-plastic member (steel material) constituting the. Therefore, the elasto-plastic element 3 can ensure fatigue strength that can withstand repeated vibrations, improve the durability of the seismic tie 110, and extend the life.

In this embodiment, as shown in the lower diagram of FIG. 4, the elastic-plastic element 3 is chamfered on the side surface from the outside in the width direction and from one end to the other end in the length direction. In the lower diagram of FIG. 4, the center C in the width direction is indicated by a two-dot chain line. In this way, by chamfering the side surface of the elastic-plastic element 3, it becomes difficult for stress to concentrate on the expansion start point position 311 in the first shoulder portion 31 and the expansion start point position 321 in the second shoulder portion 32. Thereby, the stress which generate | occur | produces in the starting point position 311 of the expansion in the 1st shoulder part 31 and the starting point position 321 of the expansion in the 2nd shoulder part 32 can further be suppressed, and the improvement of the reliability of the elastic-plastic element 3 can be aimed at. .

In addition, the length L1 of each of the chamfered portions is preferably 3 [mm] or more and less than half the thickness H1 [mm] of the elastic-plastic element 3 (3 [mm] ≦ L1 <H1 / 2 [mm]). In the lower diagram in FIG. 4, the chamfered portion is formed in a flat shape, but it is not always necessary, and for example, it may be formed in a curved shape.

Second Embodiment
Next, the structure of the elastic-plastic element 5 which concerns on 2nd Embodiment of this invention is demonstrated with reference to FIG. In the present embodiment and the third embodiment described later, the same components as those described in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

FIG. 6 shows a state in which the elastic-plastic element 5 according to the second embodiment is joined to each of the backstay 102 and the binder member 2, the upper view is a plan view, the center view is a side view, and the lower view is shown. It is a BB line sectional view in the above figure.

Unlike the configuration of the elastoplastic element 3 according to the first embodiment, the elastoplastic element 5 according to the present embodiment is arranged so that the pair of first shoulder portions 51 move outward from the front and back surfaces in the thickness direction of the main body 50 toward the one end surface 5AE. The pair of second shoulder portions 52 are formed so as to extend outward from the front and back surfaces in the thickness direction of the main body 50 toward the other end surface 5BE.

In the elastic-plastic element 5 according to this embodiment, the enlargement start point position 511 to the end point position 512 in the first shoulder portion 51 and the enlargement start point position 521 to the end point position 522 in the second shoulder portion 52 are respectively provided. , Connected by curved surfaces to draw an arc.

Also in the elastoplastic element 5 according to the present embodiment, the first top portion 501 of the opening 50A is located closer to the one end surface 5AE than the enlargement end point position 512 in each of the pair of first shoulder portions 51, The second top portion 502 is located closer to the other end surface 5BE than the enlargement end point position 522 in each of the pair of second shoulder portions 52.

Thereby, a “rigid region” is formed in each of the one end portion 5A and the other end portion 5B of the elastic-plastic element 5, and the build-up

welds

41 and 42 are formed in the “rigid region”.

Therefore, as in the first embodiment, the build-up

welds

41 and 42 do not become the weakest part in the elastoplastic element 5, and fatigue failure due to repeated vibrations occurs in the "elastoplastic body region". . Therefore, it is possible to use the elastic plastic member (steel material) constituting the elastic-plastic element 5 up to its original strength, and it is possible to ensure the fatigue strength that can withstand repeated vibrations and improve the reliability.

In the present embodiment, the pair of first shoulder portions 51 and the pair of second shoulder portions 52 are formed so as to protrude from the main body 50 in the thickness direction, and the dimensions in the width direction are not different from the conventional structure. For example, it can be used even when the installation location is restricted.

Also in the present embodiment, as shown in the lower diagram of FIG. 6, the elastic-plastic element 5 is chamfered on the side surface from the outer side in the width direction and from one end to the other end in the length direction. In the lower diagram of FIG. 6, the center C in the width direction is indicated by a two-dot chain line. Thereby, the stress which generate | occur | produces in the expansion starting point position 511 in the 1st shoulder part 51 and the expansion starting point position 521 in the 2nd shoulder part 52 can further be suppressed, and the improvement of the reliability of the elastic-plastic element 5 can be aimed at. .

Also in the present embodiment, the length L2 of each of the chamfered portions is preferably 3 [mm] or more and less than half the thickness H2 [mm] of the elastic-plastic element 5 ( 3 [mm] ≦ L2 <H2 / 2 [mm]).

<Third Embodiment>
Next, the configuration of seismic tie 110A according to the third embodiment of the present invention will be described with reference to FIG.

FIG. 7 is a diagram illustrating a configuration example of seismic tie 110A according to the third embodiment.

The seismic tie 110 </ b> A according to the present embodiment includes a support steel 111 (for example, a support steel 111 </ b> H) that extends in the left-right direction of the boiler body 10 among the plurality of support steels 111 illustrated in FIG. 1 and a left-right along the support steel 111. A backstay 102 extending in the direction is disposed so as to face the front-rear direction of the boiler body 10. The plurality of elasto-plastic elements 3 are arranged between the backstay 102 and the supporting steel frame 111 at a predetermined interval in the left-right direction.

Each of the plurality of elasto-plastic elements 3 has a first binder member 201 joined to a surface facing the backstay 102 and a second binder member 202 joined to a surface facing the support steel 111. In the present embodiment, the plurality of elastic-plastic elements 3, the first binder member 201, and the second binder member 202 are joined by welding.

Therefore, in the seismic tie 110A according to the present embodiment, a pair of binder members (the first binder member 201 and the first binder member 201 and the first binder member 201) are sandwiched between the backstay 102 and the supporting steel frame 111 from the front-rear direction. Two binder members 202) are provided.

The first binder member 201 disposed on the backstay 102 side is disposed between the pair of stoppers 6 joined to the backstay 102. The pair of stoppers 6 are arranged facing each other so as to sandwich the first binder member 201 from the left-right direction.

Since the first binder member 201 and the pair of stoppers 6 are not joined by welding or the like, they are in an unconstrained relationship with each other in the vertical direction. On the other hand, the second binder member 202 is joined to the support steel frame 111. Therefore, in the present embodiment, the plurality of elastoplastic elements 3 are fixed to the support steel 111 side, and need not be fixed to the backstay 102 side as in the first embodiment.

Also, a pair of links 7 extending in the front-rear direction are provided side by side in the left-right direction between the first binder member 201 and the second binder member 202. Each of the pair of links 7 has one end in the extending direction attached to the first binder member 201 and the other end in the extending direction attached to the second binder member 202 via the pin 8.

The pair of links 7 play a role of a parallel operation link mechanism in the horizontal direction (left-right direction), and when a horizontal relative displacement occurs between the boiler body 10 and the supporting steel frame 111 due to vibration such as an earthquake. A situation in which excessive deformation occurs in some of the plurality of elastic-plastic elements 3 can be suppressed.

As described above, the binder member may be at least a beam-like member provided between the backstay 102 and the support steel 111. For example, the backstay 102 is not limited to the configuration of the first embodiment or the present embodiment. The structure which provided the one binder member extended along the side of the support steel frame 111 may be sufficient, and there is no restriction | limiting in particular about the number and arrangement | positioning relationship.

In the first embodiment, the elastic-plastic element 3 has one end surface 3AE joined to the backstay 102 and the other end surface 3BE joined to the pair of binder members 2 by overlay welding. In this embodiment, the elastic-plastic element 3 is elastic-plastic. The element 3 has one end surface 3AE (end surface on the backstay 102 side) joined to the first binder member 201 and the other end surface 3BE (end surface on the support steel frame 111 side) joined to the second binder member 202 by overlay welding. Yes.

Note that the present invention is not limited to the above-described embodiment, and includes various other modifications. For example, the above-described embodiment has been described in detail for easy understanding of the present invention, and is not necessarily limited to one having all the configurations described.

2, 201, 202

Binder member

3, 5 Elasto-plastic element 3AE, 5AE One end face 3BE, 5BE The other end face 6 Stopper 7 Link 8 Pin 10 Boiler body 11

Boiler support structure

30, 50

Body

30A,

50A Opening

31, 51 First 1

shoulder

32,52 2nd shoulder 101 water wall 102 back stay (reinforcing member)
110 Seismic tie 111 Support steel frame (support column)
112 Hanging member 301,501 First top 302,502 Second top

Claims

A rectangular plate-shaped body used for a sandwich type seismic tie for limiting relative displacement due to vibration between a boiler body installed along a vertical direction and a support structure for supporting the boiler body. An elastic-plastic element in which one end face along the width direction is welded to the boiler body side and the other end face along the width direction is welded to the support structure side,
A rhombus-shaped opening is provided in the center of the main body, the first top of the opening is disposed on the one end surface side, and the second top of the opening is disposed on the other end surface side,
A pair of first shoulders that project outwardly from both side surfaces along the length direction of the main body or both front and back surfaces in the thickness direction toward the one end surface;
A pair of second shoulders projecting outwardly from the both side surfaces along the length direction of the main body or both the front and back surfaces in the thickness direction toward the other end surface;
The separation length from the end point of enlargement at the first shoulder to the one end surface is set to be larger than the separation length from the first top to the one end surface, and the end point of enlargement at the second shoulder. An elastic-plastic element characterized in that a separation length from a position to the other end surface is set larger than a separation length from the second top to the other end surface.
The elastic-plastic element according to claim 1,
The four apexes including the first apex and the second apex in the opening are all curved in an arc shape.
The elastic-plastic element according to claim 1 or 2,
An elastic-plastic element, wherein the first shoulder portion is connected by a curved surface from an enlargement start point position to an end point position, and the second shoulder portion is enlarged from the start point position to the end point position.
A sandwich type seismic tie for limiting relative displacement due to vibration between a boiler body installed along a vertical direction and a support structure for supporting the boiler body,
A binder member provided between the reinforcing member provided on the boiler body side and extending in the horizontal direction and the support structure;
The elastic-plastic element according to any one of claims 1 to 3, wherein a plurality of elements are arranged at predetermined intervals along the extending direction of the reinforcing member between the reinforcing member and the binder member.
Seismic tie characterized by having
A plurality of support columns for supporting the boiler body installed along the vertical direction;
A plurality of suspension members suspended from and supported by the support columns disposed in the upper part of the vertical direction among the plurality of support columns,
A seismic tie according to claim 4;
A boiler support structure characterized by comprising: