WO2018074157A1

WO2018074157A1 - Buffer member and link-type seismic tie comprising same

Info

Publication number: WO2018074157A1
Application number: PCT/JP2017/034799
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: 2016-10-19
Filing date: 2017-09-26
Publication date: 2018-04-26
Also published as: JP6824684B2; JP2018066509A

Abstract

The purpose is to extend the service life of a link-type seismic tie. A buffer member (3a) of a seismic tie (10) comprises a shaft body (31) and a pair of link connection bodies (32a, 32b) that are provided on both ends of the shaft body (31). Each of the link connection bodies (32a, 32b) has a connecting portion (321) that extends from the shaft body (31) toward the distal end in the axial direction, and a pin coupling portion (322) that is continuous to and extends from the connecting portion (321) in the axial direction and that has a tapered portion (323) that expands in diameter from the connecting portion (321). The outer diameter (D1) in the center of the connecting portion (321) is less than or equal to the outer diameter (D2) at the boundary between the shaft body (31) and the connecting portion (321) and is less than or equal to the outer diameter (D3) at the boundary between the connecting portion (321) and the tapered portion (323). At the boundary between the shaft body (31) and the connecting portion (321) and at the boundary between the connecting portion (321) and the tapered portion (323), the outer faces thereof are connected to each other by a curved face.

Description

Buffer member and link type seismic tie including the same

The present invention relates to a buffer member and a link type seismic tie including the same.

There is known a boiler apparatus that uses a boiler body in which a heat exchanger such as a economizer, an evaporator, and a superheater is mounted, suspended from an upper part of a support structure formed of a plurality of steel members. . In this boiler apparatus, for example, when an external force such as an earthquake or strong wind is applied, the support structure bends in the horizontal direction starting from the portion embedded in the ground, and the boiler body supported by the support structure also shakes in the horizontal direction. End up. Therefore, a link type seismic tie (rest prevention structure) that is bridged in the horizontal direction between the boiler body and the support structure and suppresses the shake is provided in the boiler device.

For example, the link-type seismic tie described in Patent Document 1 includes two shock-absorbing members (pins) whose center in the axial direction is attached to the boiler body side or the supporting steel frame side, and the two shock-absorbing members. And two parallel link members (connecting members) in which the upper ends and the lower ends are connected to each other. Each of the two buffer members has a spindle-shaped portion formed so that the outer diameter gradually decreases from the central portion in the axial direction toward both ends, and extends from the end portion of the spindle-shaped portion to the distal end side in the axial direction. And a link joint portion slidably joined to each link member.

In this link type seismic tie, since the buckling strength of the connecting member is set larger than the maximum bending strength of the buffer member, the buffer member absorbs the relative displacement between the boiler body and the support structure, The horizontal shake of the boiler body can be suppressed.

JP-A-1-155104

However, in the thing of patent document 1, the connection of a spindle-shaped part and a link junction part is discontinuous, and the joint is formed between both. For this reason, for example, when an external force is applied to the link type seismic tie due to an earthquake or strong wind, the stress tends to concentrate at the joint between the spindle-shaped part and the link joint part, improving the durability of the buffer member. There is a need to extend the service life.

Therefore, an object of the present invention is to provide a buffer member capable of extending the service life and a link type seismic tie provided with the same.

In order to achieve the above object, a representative present invention is a buffer member pin-coupled to a pair of link type seismic ties, and is a shaft whose diameter decreases from the center in the axial direction toward both ends. A main body, and a pair of link connecting bodies provided at both ends of the shaft main body and slidably coupled to the pair of link members, wherein the pair of link connecting bodies are respectively end portions of the shaft main body. A connecting portion extending from the connecting portion extending in the axial direction, a pin coupling portion having a taper portion extending from the connecting portion and extending in the axial direction continuously from the end portion of the connecting portion; And the outer diameter at the central portion of the connecting portion is not more than the outer diameter at the boundary between the shaft body and the connecting portion, and is not more than the outer diameter at the boundary between the connecting portion and the tapered portion. , Boundary between the shaft body and the connecting portion Then, the outer surface of the shaft body and the outer surface of the connecting portion are connected by a curved surface, and the outer surface of the tapered portion and the outer surface of the connecting portion are connected by a curved surface at the boundary between the connecting portion and the tapered portion. It is characterized by being.

According to the present invention, the service life can be extended by the above features. Problems, configurations, and effects other than those described above will be clarified by the following description of the embodiments.

It is a schematic structure figure showing an example of a boiler device provided with a seismic tie concerning an embodiment of the present invention. It is a schematic block diagram which shows an example of the seismic tie which concerns on embodiment of this invention. FIG. 3A is a schematic plan view showing a configuration example of a buffer member of a seismic tie according to an embodiment of the present invention, and FIG. 3B is a schematic plan view showing a buffer member of a seismic tie according to a comparative example. It is a graph which shows notionally the relation between the value of L2 / L1 and the ratio of the amount of energy absorption to the conventional structure. It is a graph which shows notionally the relationship between the value of L2 / L1 and the ratio of the lifetime with respect to the conventional structure.

A link type seismic tie 10 (hereinafter simply referred to as seismic tie 10) according to an embodiment of the present invention will be described below with reference to FIGS.

<Configuration of boiler device 1>
First, the whole structure of the boiler apparatus 1 is demonstrated with reference to FIG.

FIG. 1 is an overall configuration diagram illustrating an example of a boiler device 1 including a seismic tie 10 according to an embodiment. 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 11, a support structure 12 that supports the boiler body 11, and a plurality of seismic ties 10 disposed between the boiler body 11 and the support structure 12.

The boiler body 11 includes a furnace that burns fuel such as fossil fuel, and a heat exchanger such as a economizer, an evaporator, and a superheater, and is surrounded by a heat conductive wall. have. The boiler body 11 is supported by the support structure 12 in a state of being suspended in the vertical direction from the upper part of the support structure 12 toward the ground side.

The support structure 12 is formed by combining a plurality of columnar members 120. For each of the plurality of columnar members 120, for example, a steel member or the like can be used.

The plurality of seismic ties 10 are for suppressing horizontal shake of the boiler body 11 and the support structure 12 when an earthquake occurs, for example. Each of the plurality of seismic ties 10 is a link type seismic tie that connects the boiler body 11 and the columnar member 120 in the horizontal direction. In this link type seismic tie 10, when horizontal relative displacement due to vibration occurs between the boiler body 11 and the support structure 12, vibration energy corresponding to the amount of displacement can be absorbed.

<Configuration of Seismic Thai 10>
Next, a specific configuration of seismic tie 10 will be described with reference to FIGS.

FIG. 2 is a schematic configuration diagram illustrating an example of the seismic tie 10 according to the embodiment. FIG. 3A is a schematic plan view illustrating a configuration example of the

buffer members

3a and 3b of the seismic tie 10 according to the embodiment, and FIG. 3B is a schematic plan view illustrating the buffer member 9 of the seismic tie according to the comparative example. It is. FIG. 4 is a graph conceptually showing the relationship between the value of L2 / L1 and the ratio of energy absorption to the conventional structure (comparative example). FIG. 5 is a graph conceptually showing the relationship between the value of L2 / L1 and the ratio of the lifetime to the conventional structure (comparative example).

As shown in FIG. 2, the seismic tie 10 includes a pair of link members 2 a and 2 b extending along the horizontal direction and a pair arranged such that its own axial direction faces along a direction orthogonal to the horizontal direction.

Buffer members

3a and 3b. In FIG. 2, the axial directions of the pair of

buffer members

3 a and 3 b are arranged along a direction (vertical direction) orthogonal to the horizontal direction, but the present invention is not limited to this, and at least intersects the horizontal direction. What is necessary is just to arrange | position along a direction.

Each of the pair of link members 2a and 2b is formed by integrating two steel members such as a steel plate as one set. Specifically, one end portions and the other end portions in the longitudinal direction (stretching direction) of the two steel materials are welded and integrated through a connecting plate inserted between the two steel materials. In addition, about the formation method of a pair of link member 2a, 2b, it is not necessarily restricted to this.

The pair of link members 2a and 2b are arranged side by side in the vertical direction as shown in FIG. And the one ends 201a and 201b in the extending direction of the pair of link members 2a and 2b are pin-coupled to one buffer member 3a by the connecting pin 4a, and the

other ends

202a and 202b of the pair of link members 2a and 2b are connected to each other. The other buffer member 3b is pin-connected by the connecting pin 4b. Accordingly, the pair of

buffer members

3a and 3b connect the pair of link members 2a and 2b, respectively. In FIG. 2, the left side in the horizontal direction is “one side” and the right side in the horizontal direction is “the other side”.

In the following description, the link member positioned on the upper side in the vertical direction is appropriately referred to as the upper link member 2a, and the link member positioned on the lower side in the vertical direction is appropriately referred to as the lower link member 2b.

One of the buffer members 3a is formed with an insertion hole 31a extending in a direction perpendicular to the axial direction (horizontal direction in FIG. 2) in the central portion in the axial direction. The bracket 121 protruding from the side surface of the columnar member 120 toward the other side in the horizontal direction is inserted into the insertion hole 31a, so that one of the buffer members 3a is connected to the columnar member 120 (support structure 12). Yes.

Similarly, the other buffer member 3b is formed with an insertion hole 31b extending in a direction perpendicular to the axial direction (horizontal direction in FIG. 2) in a central portion in the axial direction. And the other buffer member 3b is connected with the backstay 110 (boiler main body 11) by inserting a part of the backstay 110 attached to the outer surface of the boiler main body 11 through the insertion hole 31b.

In this way, the seismic tie 10 is connected to each of the boiler body 11 and the support structure 12 so as to be bridged in the horizontal direction between the boiler body 11 and the columnar member 120 of the support structure 12. Yes.

The pair of link members 2a and 2b are set so that the buckling strength (buckling strength) is larger than the maximum bending strength of each of the pair of

buffer members

3a and 3b. Therefore, when vibration due to an earthquake or the like occurs, the pair of

buffer members

3a and 3b are bent by the external force received from the boiler body 11 and the support structure 12 to absorb vibration energy. Since the pair of link members 2a and 2b has a tensile strength larger than the buckling strength, the strength comparison between the pair of

buffer members

3a and 3b only needs to be compared with the buckling strength. .

As shown in FIG. 2, each of the pair of

buffer members

3 a and 3 b includes a shaft body 31 and a pair of

link connectors

32 a and 32 b provided at both ends of the shaft body 31 in the axial direction. . Since the pair of

buffer members

3a and 3b have the same configuration, the following description will be given by taking one buffer member 3a as an example.

The shaft body 31 is formed of an elastic-plastic member. As shown in FIG. 3A, the outer diameter of the shaft main body 31 is largest at the center CL in the axial direction (indicated by a one-dot chain line in FIG. 3A), and gradually decreases toward both ends in the axial direction. That is, the shaft main body 31 has a spindle shape with a diameter decreasing from the center CL in the axial direction toward both ends.

The pair of

link connectors

32a and 32b includes a connecting portion 321 extending from the end portion of the shaft main body 31 to the distal end side in the axial direction, and a pin extending continuously from the end portion of the connecting portion 321 in the axial direction. And a coupling portion 322. The connecting portion 321 serves as a so-called adjuster between the shaft body 31 and the pin coupling portion 322.

Since the pair of

link connectors

32a and 32b have the same configuration, the lower link connector 32b located on the lower side in the vertical direction in one buffer member 3a shown in FIG. The following will be described by taking the side as an example.

The pin coupling portion 322 is formed of an elastic member, and is pin-coupled to the one end 201b of the lower link member 2b via the connecting pin 4a. Thereby, the lower link connecting body 32b and the lower link member 2b of one buffer member 3a are slidably coupled around the connecting pin 4a.

A pin hole 325 for inserting the connection pin 4a is formed in the pin coupling portion 322. In the present embodiment, the pin hole 325 penetrates in the direction orthogonal to the axial direction (the front and back direction of the paper surface in FIG. 3A), and is one form of a through hole that penetrates in the direction intersecting the axial direction.

The pin coupling portion 322 includes a tapered portion 323 that increases in diameter from the end portion of the coupling portion 321 toward the distal end side in the axial direction, an extending portion 324 that continuously extends from the end portion of the tapered portion 323 to the distal end, have. In the present embodiment, the extending portion 324 is formed such that its outermost diameter is constant in the axial direction.

In the present embodiment, the pin coupling portion 322 is formed with a smooth surface 326 in which the periphery of the pin hole 325 is a plane perpendicular to the penetrating direction of the pin hole 325. The smooth surface 326 is optional and does not necessarily have to be formed in the pin coupling portion 322.

As shown in FIG. 3A with a part thereof enlarged, at the boundary B1 between the shaft main body 31 and the connecting portion 321, the outer surface 31s of the shaft main body 31 and the outer surface 321s of the connecting portion 321 are connected by a curved surface. Similarly, at the boundary B2 between the connecting portion 321 and the tapered portion 323, the outer surface 321s of the connecting portion 321 and the outer surface 323s of the tapered portion 323 are connected by a curved surface.

The outer diameter D1 (hereinafter simply referred to as the outer diameter D1) at the center of the connecting portion 321 is greater than the outer diameter D2 (hereinafter simply referred to as the outer diameter D2) at the boundary B1 between the shaft body 31 and the connecting portion 321. Is smaller (D1 <D2) and smaller than an outer diameter D3 (hereinafter simply referred to as an outer diameter D3) at the boundary B2 between the connecting portion 321 and the tapered portion 323 (D1 <D3). Therefore, the outer surface 31s of the shaft body 31, the outer surface 321s of the connecting portion 321 and the outer surface 323s of the tapered portion 323 are smoothly continuous so as to draw an arc.

On the other hand, as shown in FIG. 3B, in the buffer member 9 according to the comparative example, which is an example of the conventional structure, the link connector 92 does not have a connecting portion unlike the configuration of the buffer member 3a according to the present embodiment. Accordingly, the tapered portion 923 extends from the end portion of the shaft main body 91 toward the distal end side in the axial direction.

As shown in an enlarged view in FIG. 3B, a joint J is formed between the shaft body 91 and the tapered portion 923. The outer surface 91s of the shaft body 91 and the outer surface 923s of the tapered portion 923 are: It is clearly divided at the joint J. In this case, when an external force due to vibration is applied to the buffer member 9, stress concentrates on the joint J, and for example, a crack may occur from the joint J as shown in FIG. 3B.

However, in the buffer member 3a according to the present embodiment, the connecting portion 321 is provided between the shaft body 31 and the tapered portion 323, and the outer surface 31s of the shaft body 31, the outer surface 321s of the connecting portion 321 and the connecting portion 321 are provided. Since the outer surface 321 s is smoothly continuous, no joints that lead to breakage are formed. As a result, for example, the shock absorbing member 3a is less likely to be damaged by vibrations such as repeated earthquakes, and the service life can be extended.

The outer diameter D1 is not necessarily smaller than the outer diameter D2 (D1 <D2) and smaller than the outer diameter D3 (D1 <D3). For example, the outer diameter D1, the outer diameter D2, and the outer diameter D1 are not necessarily required. The diameters D3 may all be the same size (D1 = D2 = D3). That is, at least the outer diameter D1 may be equal to or smaller than the outer diameter D2 (D1 ≦ D2) and equal to or smaller than the outer diameter D3 (D1 ≦ D3).

Further, as shown in FIG. 3A, the axial distance between the center of the pin hole 325 and the center CL of the shaft body 31 is L1 (hereinafter simply referred to as distance L1), and the axial length of the connecting portion 321 is obtained. When the thickness is L2 (hereinafter simply referred to as length L2), it is desirable that the relationship L2 / L1 ≦ 0.42 holds between the distance L1 and the length L2.

As shown in the graph of FIG. 4, in the buffer member 3a in which the distance L1 and the length L2 are set so that L2 / L1 ≦ 0.42, vibration energy is absorbed by the buffer member 9 having the conventional structure shown in FIG. 3B. The quantity ratio is between 0.9 and 1.0. Therefore, even if it has a connection part 321 like the buffer member 3a which concerns on this embodiment, the absorption amount of the vibration energy which the buffer member 3a absorbs falls significantly compared with the buffer member 9 of a conventional structure. There is no.

In this case, as shown in the graph of FIG. 5, in the buffer member 3a according to the present embodiment, the ratio of the life to the buffer member 9 having the conventional structure is 1.0 or more. Therefore, the service life of the buffer member 3a according to the present embodiment is longer than the service life of the buffer member 9 having the conventional structure.

In addition, it is more desirable that the relationship of 0.03 ≦ L2 / L1 ≦ 0.46 is established between the distance L1 and the length L2. In this case, in the buffer member 3a according to the present embodiment, the ratio of the absorption amount of vibration energy to the buffer member 9 having the conventional structure shown in the graph of FIG. 4 becomes a value close to 1.0, and the conventional technology shown in the graph of FIG. The life ratio of the structure to the buffer member 9 is 2.0 or more.

Therefore, the seismic tie 10 including the pair of

buffer members

3a and 3b satisfying 0.03 ≦ L2 / L1 ≦ 0.46 greatly reduces the amount of vibration energy absorbed by the pair of

buffer members

3a and 3b. It is possible to extend the service life without this.

Note that the present invention is not limited to the above-described embodiment, and includes various 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.

2a,

2b Link member

3a, 3b Buffer member 10 Seismic tie (link type seismic tie)
DESCRIPTION OF SYMBOLS 11 Boiler main body 12 Support structure 31 Shaft

main body

31s, 321s, 323s Outer surface 32 Link connection body 120

Columnar member

201a, 201b One

end part

202a, 202b The other end part 321 Connection part 322 Pin coupling part 323 Taper part 325 Pin hole (through hole) )
B1, B2 boundary D1, D2, D3 Outer diameter

Claims

A buffer member pin-coupled to a pair of link seismic ties,
A shaft main body that decreases in diameter from the center in the axial direction toward both ends;
A pair of link connectors provided at both ends of the shaft main body and slidably coupled to the pair of link members;
Each of the pair of link connectors is respectively
A connecting portion extending from the end portion of the shaft main body to the tip end side in the axial direction;
A pin coupling portion having a taper portion extending continuously from the end portion of the coupling portion in the axial direction and having a diameter increased from the coupling portion;
The outer diameter at the central portion of the connecting portion is not more than the outer diameter at the boundary between the shaft body and the connecting portion, and is not more than the outer diameter at the boundary between the connecting portion and the tapered portion,
The outer surface of the shaft body and the outer surface of the connecting portion are connected by a curved surface at the boundary between the shaft body and the connecting portion, and the outer surface of the tapered portion and the outer surface of the tapered portion are connected at the boundary between the connecting portion and the tapered portion. A buffer type seismic tie cushioning member characterized in that the outer surface of the connecting portion is connected by a curved surface.
The shock absorber of the link type seismic tie according to claim 1,
An outer diameter at the central portion of the connecting portion is smaller than an outer diameter at a boundary between the shaft body and the connecting portion, and is smaller than an outer diameter at a boundary between the connecting portion and the tapered portion. The link type seismic tie cushioning member.
The shock absorber of the link type seismic tie according to claim 1,
The pin coupling portion is formed with a through hole penetrating in a direction intersecting the axial direction,
When the axial distance between the center of the through hole and the center of the shaft body is L1, and the axial length of the connecting portion is L2, L2 / L1 ≦ 0.42. A shock absorber of a link type seismic tie.
The link type seismic tie cushioning member according to claim 3,
The relationship between the axial distance L1 between the center of the through hole and the center of the shaft main body and the axial length L2 of the connecting portion is 0.03 ≦ L2 / L1 ≦ 0.46. A link type seismic tie cushioning member characterized by being:
It is arranged between a support structure formed by combining a plurality of columnar members and a boiler body suspended from the upper part of the support structure, and the horizontal swing of the support structure and the boiler body is prevented. Link type seismic tie to suppress,
A pair of link members extending along the horizontal direction;
A pair of buffer members having an axial direction in a direction intersecting the horizontal direction and pin-bonding one end portions and the other end portions in the extending direction of the pair of link members;
The pair of buffer members are respectively
A shaft main body that decreases in diameter from the center in the axial direction toward both ends,
A pair of link connectors provided at both ends of the shaft body and slidably coupled to the pair of link members;
Each of the pair of link connectors is respectively
A connecting portion extending from the end portion of the shaft main body to the tip end side in the axial direction;
A pin coupling portion having a taper portion extending continuously from the end portion of the coupling portion in the axial direction and having a diameter increased from the coupling portion;
The outer diameter at the central portion of the connecting portion is not more than the outer diameter at the boundary between the shaft body and the connecting portion, and is not more than the outer diameter at the boundary between the connecting portion and the tapered portion,
The outer surface of the shaft body and the outer surface of the connecting portion are connected by a curved surface at the boundary between the shaft body and the connecting portion, and the outer surface of the tapered portion and the outer surface of the tapered portion are connected at the boundary between the connecting portion and the tapered portion. Link type seismic tie, characterized in that the outer surface of the connecting part is connected by a curved surface.