Maximum displacement recording device

Abstract

To provide a maximum displacement recording device that can record the maximum displacement of a friction damper during an earthquake.SOLUTION: A maximum displacement recording device for a friction damper 1 includes a long rod-shaped member 21, a reference member 22, a first movable portion 23 held at one end of the rod-shaped member 21 and slidable in the longitudinal direction of the rod-shaped member 21, and a second movable portion 24 held at the other end of the rod-shaped member 21 and slidable in the longitudinal direction of the rod-shaped member 21. The reference member 22 is located on a reference portion in the center of the longitudinal direction of the rod-shaped member 21, does not change its position due to the sliding of the rod-shaped member 21, and is clamped between the first movable portion 23 and the second movable portion 24. When the rod-shaped member 21 slides, the first movable portion 23 and the second movable portion 24 slide toward the end of the rod-shaped member 21 due to contact with the reference member 22, and the distance between the positions of the first movable portion 23 and the second movable portion 24 after the sliding stops and the reference portion can be recorded as the maximum displacement.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a device for recording the maximum displacement of a friction damper. [Background technology]

[0002] In Japan, where earthquakes occur frequently, damage control and restoration of buildings, bridges, and other structures during large-scale earthquakes are important issues.

[0003] For example, friction dampers have been known for some time to reduce vibrations that occur during earthquakes in structures such as buildings and bridges. Friction dampers generate frictional force due to relative displacement between two parts, and convert this frictional force into heat to absorb kinetic energy, thereby efficiently attenuating vibrations.

[0004] On the other hand, after a large earthquake occurs, it is important to quickly grasp the maximum displacement of the friction damper and determine whether traffic can pass through the bridge, how to prioritize restoration work, and whether damper maintenance is required.

[0005] Known technology relating to a device for measuring the displacement of a damper is, for example, the technology of Patent Document 1. Specifically, Patent Document 1 describes a damper displacement measuring device that includes a cylindrical rod cover in which a long hole is formed in the sliding direction of a cylinder, a pair of first movable parts provided on the rod cover so as to be slidable along the long hole, and an operating piece provided on the cylinder so as to be immovable in the sliding direction, and inserted into the long hole so as to be positioned between the pair of first movable parts. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2019-203339 A Summary of the Invention [Problem to be solved by the invention]

[0007] However, the device in Patent Document 1 is a displacement measuring device for a vibration damper. In general, a vibration damper includes a cylindrical cylinder in which a piston is slidably housed, and a rod slidably inserted into the cylinder and connected to the piston, and includes a mechanism for attenuating vibration by expansion and contraction between the cylinder and the rod. Therefore, friction dampers and vibration dampers are different in structure, operation mechanism, etc., and the structure of the displacement measuring device described in Patent Document 1 cannot be directly applied to friction dampers.

[0008] The present invention has been made in consideration of the above circumstances, and has an object to provide a maximum displacement recording device that has a simple structure and is capable of accurately recording the maximum displacement of a friction damper when an earthquake occurs. [Means for solving the problem]

[0009] In order to solve the above problems, the following maximum displacement recording device and friction damper are provided. [1] A device for recording the maximum displacement of a friction damper, A long rod-shaped member, A reference member; A first movable part that is held on one end side of the rod-shaped member and is slidable along the longitudinal direction of the rod-shaped member; A second movable part that is held on the other end side of the rod-shaped member and is slidable along the longitudinal direction of the rod-shaped member; Equipped with The rod-shaped member has a reference portion near the center in the longitudinal direction, is disposed approximately parallel to the extension and contraction direction of the friction damper, and is capable of sliding in the extension and contraction direction of the friction damper, the reference member is located on the reference portion, does not change its position due to the sliding of the rod-shaped member, and is sandwiched between the first movable portion and the second movable portion; When the sliding of the rod-shaped member occurs, the first movable portion and the second movable portion slide toward the end of the rod-shaped member by contacting with the reference member, The distance between the positions of the first and second movable parts and the reference part after the sliding stops can be recorded as a maximum displacement amount. A device for recording the maximum displacement of a friction damper. [2] The rod-shaped member is provided with fixing parts near both ends in the longitudinal direction, which can be attached to both ends in the extension / contraction direction of the friction damper. The maximum displacement recording device according to [1] above. [3] The reference member has an opening that opens in the extension / contraction direction of the friction damper, and the rod-shaped member is inserted into the opening. The maximum displacement recording device according to claim [1] or [2]. [4] The first movable portion and the second movable portion have a shape that makes them unable to pass through the opening. The maximum displacement recording device according to [3] above. [5] The first movable portion and the second movable portion are formed with a through hole having an inner diameter corresponding to the outer diameter of the rod-shaped member, and the rod-shaped member is inserted into the through hole. The maximum displacement recording device according to any one of [1] to [4] above. [6] The rod-shaped members are connected in the longitudinal direction via a joint member provided between the first rod-shaped member and the second rod-shaped member, and the joint member has the reference portion on a surface exposed to the outside, the reference portion being colored in a color different from the colors of the first rod-shaped member and the second rod-shaped member. The maximum displacement recording device according to any one of [1] to [5] above. [7] Equipped with a maximum displacement recording device according to any one of [1] to [6] above. A friction damper characterized by: Effect of the Invention

[0010] According to the maximum displacement recording device and the friction damper equipped with the same of the present invention, the maximum displacement of the friction damper when an earthquake occurs can be accurately recorded with a simple structure. [Brief description of the drawings]

[0011] [Figure 1]FIG. 2 is a schematic diagram illustrating a state in which a maximum displacement recording device of the present invention is attached to a friction damper. [Diagram 2] 1 is a front view illustrating one embodiment of a reference member in a maximum displacement recording device of the present invention; [Diagram 3] 3 is a front view illustrating one embodiment of a reference part of a rod-shaped member in a maximum displacement recording device of the present invention. In Fig. 3, the reference member, the first movable part, and the second movable part are omitted, and their positions are indicated by dotted lines. [Figure 4] 1 is a schematic diagram illustrating a state of the maximum displacement amount recording device of the present invention when a displacement occurs in a friction damper. FIG. [Diagram 5] 1 is a schematic diagram illustrating a state of the maximum displacement amount recording device of the present invention when a displacement occurs in a friction damper. FIG. [Figure 6] FIG. 2 is a schematic diagram illustrating a state in which a maximum displacement recording device of the present invention is attached to a friction damper. [Figure 7] 1 is a schematic diagram illustrating a state of the maximum displacement amount recording device of the present invention when a displacement occurs in a friction damper. FIG. [Figure 8] FIG. 2 is a schematic diagram illustrating a state in which a maximum displacement recording device of the present invention is attached to a friction damper. [Figure 9] 1 is a schematic diagram illustrating a state of the maximum displacement amount recording device of the present invention when a displacement occurs in a friction damper. FIG. [Figure 10] FIG. 11 is a schematic diagram illustrating a form for checking the amount of displacement of a friction damper after vibration caused by an earthquake has stopped. [Figure 11] FIG. 11 is a cross-sectional view illustrating another embodiment of the reference portion. [Figure 12] FIG. 11 is a schematic diagram illustrating one embodiment for visually checking the maximum displacement amount. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, a first embodiment of a maximum displacement recording device for a friction damper according to the present invention will be described with reference to Figs. 1 to 4.

[0013] Fig. 1 is a schematic diagram illustrating a state in which the maximum displacement recording device of the present invention is attached to a friction damper. Fig. 2 is a front view illustrating an example of a reference member in the maximum displacement recording device of the present invention. Fig. 3 is a front view illustrating an example of a reference part of a rod-shaped member in the maximum displacement recording device of the present invention. Figs. 4 and 5 are schematic diagrams illustrating the state of the maximum displacement recording device of the present invention when displacement occurs in the friction damper.

[0014] The friction damper 1 of the embodiment shown in FIG. 1 includes a body portion 11, an expandable portion 12, and a contact portion 13.

[0015] The body 11 includes a flat base 11a and an upright portion 11b that stands up from the center of the base 11a. The base 11a is fixed to a part of a structure such as a building or a bridge.

[0016] The stretchable portion 12 includes a first stretchable portion 12a and a second stretchable portion 12b extending laterally from the standing portion 11b of the body portion 11. The first stretchable portion 12a and the second stretchable portion 12b face each other across the standing portion 11b and are provided in the same straight line.

[0017] The expandable portion 12 is structured to expand and contract while absorbing vibrations during an earthquake. Specifically, the first expandable portion 12a and the second expandable portion 12b expand simultaneously, and the first expandable portion 12a and the second expandable portion 12b expand simultaneously.

[0018] The internal structure of the expandable portion 12 is not particularly limited, and may include various structures known as the friction damper 1. More specifically, although not shown, an example of the structure may include a structure in which a metal die (ring) and rod (core rod) are provided inside the expandable portion 12. An example of the structure may include a structure in which a rod that is slightly thicker than the inner diameter of the die is fitted into the die, generating a clamping force on the outer periphery of the rod, and when the rod is pushed or pulled in the axial direction, a frictional force is generated on the contact surface between the die and the rod.

[0019] The contact portions 13 are provided at both ends of the expandable portion 12 in the expansion and contraction direction (the direction of the arrow A) of the friction damper 1, and come into contact with a part of a structure such as a building or a bridge.

[0020] The maximum displacement recording device 2 includes a rod-shaped member 21, a reference member 22, a first movable part 23, and a second movable part 24.

[0021] The rod-shaped member 21 has a long shape, and the material is not particularly limited. Specifically, the rod-shaped member 21 can be, for example, a steel rod or a wire. The length of the rod-shaped member 21 is also not particularly limited, but it is preferable that the length is approximately the same as the distance between the contact portions 13 located at both ends of the friction damper 1.

[0022] The rod-shaped member 21 is disposed approximately parallel to the extension / retraction direction (direction of arrow A) of the friction damper 1. In addition, near both ends of the rod-shaped member 21 in the longitudinal direction, fixed parts 21a are provided which are fixed to a pair of abutment parts 13 of the friction damper 1. The rod-shaped member 21 is fixed to the upper surface of the abutment part 13 of the friction damper 1 via the fixed parts 21a. Furthermore, the rod-shaped member 21 is provided with a string-like holding part 21b which extends downward and supports the extension / retraction part 12. The holding part 21b is provided on each of the first extension / retraction part 12a side and the second extension / retraction part 12b side. Since the waterproof cover C of the extension / retraction part 12 is supported from below by the holding part 21b, it is possible to prevent the waterproof cover C from sagging.

[0023] The rod-shaped member 21 is capable of sliding in the expansion / contraction direction (direction of arrow A) of the friction damper 1, following the expansion / contraction of the friction damper 1. Specifically, when an earthquake occurs, the expansion / contraction part 12 of the friction damper 1 expands and contracts to reduce vibration, but since the rod-shaped member 21 slides following the expansion / contraction of the friction damper 1, its positional relationship relative to the body part 11 may change.

[0024] In this embodiment, one reference portion 25 is provided near the center in the longitudinal direction of rod-shaped member 21. Here, reference portion 25 is preferably a region visually indicated on the outer circumferential surface of rod-shaped member 21. The width of reference portion 25 (the length in the longitudinal direction of rod-shaped member 21) can be designed as appropriate.

[0025] The reference member 22 is normally located on the reference portion 25 of the rod-shaped member 21. In this embodiment, the reference member 22 is fixed to the upper surface of the upright portion 11b of the body portion 11 of the friction damper 1.

[0026] It is preferable that the reference member 22 has an opening 22a that opens in the extension / contraction direction (the direction of the arrow A) of the friction damper 1. For example, as illustrated in Fig. 2, the reference member 22 may be a flat plate-like member having an opening 22a that is a horizontally long oval.

[0027] The rod-shaped member 21 is inserted into the opening 22a of the reference member 22. As described above, when an earthquake occurs, the rod-shaped member 21 can slide in the expansion / contraction direction (the direction of arrow A) following the expansion / contraction of the friction damper 1, but since the rod-shaped member 21 is inserted into the opening 22a of the reference member 22, the sliding of the rod-shaped member 21 does not cause a position change of the reference member 22.

[0028] The first movable portion 23 is disposed on one end side of the rod-shaped member 21 (indicated by an arrow A R The second movable portion 24 is held at the other end side (arrow A) of the rod-shaped member 21. L That is, the first movable part 23 and the second movable part 24 are located on one end side and the other end side of the rod-shaped member 21, and the reference member 22 is sandwiched between the first movable part 23 and the second movable part 24.

[0029] As illustrated in FIG. 3, the reference portion 25 includes a position in the longitudinal direction of the rod-shaped member 21 that corresponds to a first contact surface F1 that is a contact surface between the reference member 22 and the first movable portion 23 (the end portion 23a on the central side in the extension / contraction direction (arrow A direction) of the friction damper 1). The reference portion 25 also includes a position in the longitudinal direction of the rod-shaped member 21 that corresponds to a second contact surface F2 that is a contact surface between the reference member 22 and the second movable portion 24 (the end portion 24a on the central side in the extension / contraction direction (arrow A direction) of the friction damper 1). That is, the reference portion 25 includes an area that includes a first portion 25a that is a part of the rod-shaped member 21 located on a plane including the first contact surface F1, and a second portion 25b that is a part of the rod-shaped member 21 located on a plane including the second contact surface F2.

[0030] The first movable part 23 and the second movable part 24 preferably have a shape that prevents them from passing through the opening 22a of the reference member 22. Specifically, in this embodiment, the first movable part 23 and the second movable part 24 are substantially cylindrical, and a through hole having an inner diameter corresponding to the outer diameter of the rod-shaped member 21 (preferably an inner diameter substantially equal to the outer diameter of the rod-shaped member 21) is formed in the center of the cylinder. The rod-shaped member 21 is inserted into this through hole.

[0031] The first movable part 23 and the second movable part 24 are slidable along the longitudinal direction of the rod-shaped member 21. Furthermore, it is preferable that the first movable part 23 and the second movable part 24 do not slide (are in a stopped state) when no force is applied to the first movable part 23 and the second movable part 24 in the extension / contraction direction of the friction damper 1 (the direction of the arrow A).

[0032] When an earthquake occurs, the displacement of the friction damper 1 (expansion and contraction of the expandable portion 12) due to vibration can cause the rod-shaped member 21 to slide in the expansion and contraction direction of the friction damper 1 (direction of arrow A).

[0033] For example, as shown in Figure 4, arrow A R The amount of displacement of the friction damper 1 in the direction (the amount of extension of the first expandable portion 12a) is σ R In this case, the rod member 21 also R The slide is in the direction, and the amount of movement due to this slide is σ RWhen the rod-shaped member 21 slides, the second movable portion 24 comes into contact with the reference member 22 and moves in the direction of the end of the rod-shaped member 21 (A L The second movable part 24 is pushed out in the direction (the direction of the arrow A) and slides. The distance that the second movable part 24 slides is a movement amount σ R is the distance equal to

[0034] For example, as shown in FIG. L The amount of displacement of the friction damper 1 in the direction (the amount of extension of the second expansion and contraction portion 12b) is σ L In this case, the rod-shaped member 21 also L The slide is in the direction, and the amount of movement due to this slide is σ L When the rod-shaped member 21 slides, the first movable portion 23 comes into contact with the reference member 22 and moves in the direction of the end of the rod-shaped member 21 (A R The distance that the first movable part 23 slides is a movement amount σ L is the distance equal to

[0035] The first movable part 23 and the second movable part 24 slide toward the end direction according to the amount of displacement of the friction damper 1. Therefore, during repeated vibrations, the first movable part 23 and the second movable part 24 stop at the position where the maximum displacement occurs in the friction damper 1 (the position where the extension of the first expandable part 12a and the second expandable part 12b becomes maximum). In other words, for example, after a vibration that gives the maximum displacement to the friction damper 1, the first movable part 23 and the second movable part 24 do not slide due to other vibrations that give a displacement smaller than that.

[0036] Therefore, after vibration caused by an earthquake has stopped, the stop positions of the first movable part 23 and the second movable part 24 indicate the maximum displacement of the friction damper 1. For this reason, the maximum displacement recording device 2 can record the distance between the positions of the first movable part 23 and the second movable part 24 after sliding has stopped and the reference part 25 as the maximum displacement. In this case, it is preferable to use the first part 25a and the second part 25b of the reference part 25 as references and record the distance to the end 23a of the first movable part 23 and the end 24a of the second movable part 24 located on the central side in the extension / contraction direction (arrow A direction) of the friction damper 1 as the maximum displacement.

[0037] The maximum displacement of the friction damper 1 can be understood as the maximum displacement toward the first movable part 23 (first maximum displacement) and the maximum displacement toward the second movable part 24 (second maximum displacement). Furthermore, when the positions of the reference part 25 and the reference member 22 are aligned after the vibration caused by the earthquake has stopped, the distance between the positions of the first movable part 23 and the second movable part 24 and the position of the reference member 22 can actually be visually confirmed as the maximum displacement.

[0038] Furthermore, even if a residual displacement occurs in the structure due to an earthquake, the position of the reference part 25 is less likely to be affected by the residual displacement, so the maximum displacement recording device 2 can record the distance between the positions of the first movable part 23 and the second movable part 24 after they stop sliding and the reference part 25 as the maximum displacement.

[0039] As described above, the maximum displacement recording device 2 of the first embodiment can accurately record the maximum displacement of the friction damper 1 when an earthquake occurs with a simple structure.

[0040] A second embodiment of the maximum displacement recording device of the present invention will be described with reference to Figures 6 and 7. Descriptions of parts common to the first embodiment will be omitted.

[0041] Fig. 6 is a schematic diagram illustrating a state in which the maximum displacement recording device of the present invention is attached to a friction damper. Fig. 7 is a schematic diagram illustrating a state in which the maximum displacement recording device of the present invention is in a state in which a displacement occurs in the friction damper.

[0042] In the maximum displacement recording device 2 of this embodiment, the upright portion 11b of the friction damper 1 serves as the reference member 22. That is, the maximum displacement recording device 2 of this embodiment includes the upright portion 11b as the reference member 22.

[0043] In this embodiment, an opening 22a is provided in the standing portion 11b (reference member 22) located below the extension / retraction portion 12, penetrating in the extension / retraction direction (arrow A direction) of the friction damper 1, and a rod-shaped member 21 is inserted into this opening 22a. In the event of an earthquake, the rod-shaped member 21 can slide in the extension / retraction direction (arrow A direction) following the extension / retraction of the friction damper 1, but since it is inserted into the opening 22a of the standing portion 11b (reference member 22), the sliding of the rod-shaped member 21 does not cause a position change of the standing portion 11b (reference member 22).

[0044] The standing portion 11b (reference member 22) is sandwiched between a first movable portion 23 and a second movable portion 24. The first movable portion 23 and the second movable portion 24 are slidable along the longitudinal direction of the rod-shaped member 21.

[0045] In this embodiment, the reference portion 25 includes a first reference portion 251 and a second reference portion 252. The first reference portion 251 includes an abutment surface between the standing portion 11b (reference member 22) and the first movable portion 23 in the longitudinal direction of the rod-shaped member 21. The second reference portion 252 includes an abutment surface between the standing portion 11b (reference member 22) and the second movable portion 24 in the longitudinal direction of the rod-shaped member 21. In other words, the standing portion 11b (reference member 22) is located on the reference portion 25 (first reference portion 251, second reference portion 252).

[0046] As shown in Figure 7, when an earthquake occurs, arrow A R The amount of displacement of the friction damper 1 in the direction (the amount of extension of the first expandable portion 12a) is σ R In this case, the rod-shaped member 21 also R The slide is in the direction, and the amount of movement due to this slide is σ R When the rod-shaped member 21 slides, the second movable portion 24 comes into contact with the reference member 22 and moves in the direction of the end of the rod-shaped member 21 (A L The object is pushed out in the direction indicated by arrow A and slides. L The displacement of the friction damper 1 in the direction is the same as in the first embodiment, and the first movable part 23 moves in the direction of the end of the rod-shaped member 21 (A R The actuator is pushed out in the opposite direction and slides.

[0047] Since the first movable part 23 and the second movable part 24 slide toward the end direction in accordance with the displacement amount of the friction damper 1, the first movable part 23 and the second movable part 24 stop at the position where the maximum displacement occurs in the friction damper 1. Therefore, after the vibration caused by the earthquake stops, the stop positions of the first movable part 23 and the second movable part 24 indicate the maximum displacement amount of the friction damper 1.

[0048] Therefore, the maximum displacement recording device 2 can record the distance between the positions of the first movable part 23 and the second movable part 24 after the sliding stops and the reference part 25 (first reference part 251, second reference part 252) as the maximum displacement (first maximum displacement, second maximum displacement). If the standing part 11b (reference member 22) has returned to the predetermined position before the earthquake occurs (the positions of the reference part 25 and the reference member 22 are the same) after the vibration caused by the earthquake stops, the distance between the first movable part 23 and the second movable part 24 after the sliding stops and the standing part 11b can be visually confirmed as the maximum displacement.

[0049] As described above, the maximum displacement recording device 2 of the second embodiment can accurately record the maximum displacement of the friction damper 1 when an earthquake occurs with a simple structure.

[0050] A maximum displacement recording device according to a third embodiment of the present invention will be described with reference to Figures 8 to 10. Descriptions of parts common to the first embodiment will be partially omitted.

[0051] Fig. 8 is a schematic diagram illustrating a state in which the maximum displacement recording device of the present invention is attached to a friction damper. Fig. 9 is a schematic diagram illustrating a state in which the maximum displacement recording device of the present invention is in a state in which a displacement occurs in the friction damper. Fig. 10 is a schematic diagram illustrating a form for checking the displacement of the friction damper after vibration caused by an earthquake has stopped.

[0052] In the maximum displacement recording device 2 of this embodiment, the standing part 11b of the friction damper 1 functions as the reference member 22, and the rod D arranged inside the expansion and contraction part 12 of the friction damper 1 functions as the bar-shaped member 21. That is, the maximum displacement recording device 2 of this embodiment includes the standing part 11b as the reference member 22 and the rod D as the bar-shaped member 21.

[0053] The standing portion 11b (reference member 22) is sandwiched between a first movable portion 23 and a second movable portion 24. The first movable portion 23 and the second movable portion 24 are slidable along the longitudinal direction of the rod D (rod-shaped member 21).

[0054] In this embodiment, the reference portion 25 includes a first reference portion 251 and a second reference portion 252. The first reference portion 251 includes an abutment surface between the standing portion 11b (reference member 22) and the first movable portion 23 in the longitudinal direction of the rod-shaped member 21. The second reference portion 252 includes an abutment surface between the standing portion 11b (reference member 22) and the second movable portion 24 in the longitudinal direction of the rod-shaped member 21. In other words, the standing portion 11b (reference member 22) is located on the reference portion 25 (first reference portion 251, second reference portion 252).

[0055] As shown in Figure 9, when an earthquake occurs, arrow A R The amount of displacement of the friction damper 1 in the direction (the amount of movement due to the sliding of the rod D (rod-shaped member 21)) is σ R In this case, when the rod D (rod-shaped member 21) slides, the second movable part 24 moves in the end direction (A L The object is pushed out in the direction indicated by arrow A and slides. L The same is true for the displacement of the friction damper 1 in the direction, and the first movable part 23 moves in the end direction (A R The actuator is pushed out in the opposite direction and slides.

[0056] Since the first movable part 23 and the second movable part 24 slide toward the end direction according to the displacement amount of the friction damper 1 (the movement amount due to the sliding of the rod D (rod-shaped member 21)), the first movable part 23 and the second movable part 24 stop at the position where the maximum displacement occurs in the friction damper 1. Therefore, after the vibration caused by the earthquake stops, the stop positions of the first movable part 23 and the second movable part 24 indicate the maximum displacement amount of the friction damper 1. Therefore, the maximum displacement amount recording device 2 can record the distance between the positions of the first movable part 23 and the second movable part 24 after the sliding stops and the reference part 25 (first reference part 251, second reference part 252) as the maximum displacement amount (first maximum displacement amount, second maximum displacement amount).

[0057] Furthermore, after the vibration caused by the earthquake has stopped, if the standing part 11b (reference member 22) has returned to the specified position before the earthquake occurred (the positions of the reference part 25 and the reference member 22 are the same), then, for example, as shown in Figure 10, a part of the extension part 12 (for example, a waterproof cover) can be opened and the distance between the first movable part 23 and the second movable part 24 and the standing part 11b after the sliding has stopped can be visually confirmed as the maximum displacement amount.

[0058] As described above, the maximum displacement recording device 2 of the third embodiment can accurately record the maximum displacement of the friction damper 1 when an earthquake occurs with a simple structure.

[0059] The friction damper 1 of the present invention includes the maximum displacement recording device 2 of the present invention including the above-mentioned embodiment. The friction damper 1 of the present invention has a simple structure and can accurately record the maximum displacement when an earthquake occurs.

[0060] The maximum displacement recording device and the friction damper of the present invention are not limited to the above-mentioned embodiments. For example, the following embodiments are exemplified as the form of the reference portion and the form for visually confirming the maximum displacement.

[0061] (Another form of the reference part) The reference portion can be formed by a known method, for example, coloring, processing to give a shape change, scribing (lines, holes, etc.), etc. Examples of the coloring method include painting, attaching a colored tape, etc.

[0062] Further, as another embodiment of the reference portion, the embodiment shown in FIG. 11 can be exemplified. In this embodiment, a colored joint member 26 is incorporated into a part of the rod-shaped member 21. Specifically, the rod-shaped member 21 includes a first rod-shaped member 211 and a second rod-shaped member 212. Furthermore, at least an end 211a of the first rod-shaped member 211 located on the joint member 26 side and an end 212a of the second rod-shaped member 212 located on the joint member 26 side have an internal gap. The first rod-shaped member 211 and the second rod-shaped member 212 are parallel to the extension / contraction direction of the extension / contraction portion, and the first rod-shaped member 211 and the second rod-shaped member 212 are connected in the longitudinal direction via the joint member 26.

[0063] The joint member 26 has a pair of engagement parts 26a and a reference part 25. One of the engagement parts 26a is inserted into the end part 211a of the first rod-shaped member 211, and the other of the engagement parts 26a is inserted into the end part 212a of the second rod-shaped member 212, thereby connecting the first rod-shaped member 211 and the second rod-shaped member 212 in the longitudinal direction. The reference part 25 of the joint member 26 is located between the first rod-shaped member 211 and the second rod-shaped member 212 and is exposed to the outside. In other words, the joint member 26 has a reference part 25 on a surface exposed to the outside that is colored in a color different from the first rod-shaped member 211 and the second rod-shaped member 212. Moreover, the reference portion 25 is substantially flush with the first rod-shaped member 211 and the second rod-shaped member 212, and is colored in a color different from the first rod-shaped member 211 and the second rod-shaped member 212, so that the sliding of the first movable portion and the second movable portion is not hindered, and the reference portion 25 of the joint member 26 is easily visible. Therefore, the distance between the first movable portion (not shown in FIG. 11) and the second movable portion (not shown in FIG. 11) and the reference portion 25 after the sliding stops can be visually confirmed as the maximum displacement amount. Furthermore, compared to the case where the reference portion 25 is formed by sticking a tape, there is no risk of the tape falling off, so the maximum displacement amount can be reliably confirmed over a long period of time.

[0064] (One way to visually confirm the maximum displacement) As illustrated in FIG. 12, the first movable member 23 and the second movable member 24 can be used, each having a predetermined width W (length in a direction parallel to the longitudinal direction of the rod-shaped member 21) suitable for visual confirmation of the maximum displacement. Specifically, by making the width W of the first movable member 23 and the second movable member 24 a multiple of 10 mm (10 mm×n (n is a natural number)), it can be used as a scale in centimeters when visually checking from a distance or taking a photograph. For example, in the embodiment illustrated in FIG. 12, the first movable member 23 with a width W of 10 mm has slid two times, so that it can be confirmed that the distance from the reference part 25 is 20 mm (2 cm). Therefore, the distance (maximum displacement) between the first movable part 23 and the second movable part 24 and the reference part 25 after the sliding stops can be easily confirmed. [Explanation of symbols]

[0065] 1 Friction Damper 11 Body part 12 Telescopic part 13 Contact part 2. Maximum displacement recording device 21 Rod-shaped member 211 First rod-shaped member 212 Second rod-shaped member 22 Reference material 23 First movable member 24 Second movable member 25 Reference section 26 Joint members

Claims

1. A device for recording maximum displacement of a friction damper, A long rod-shaped member, A reference member; a first movable portion held at one end of the rod-shaped member and slidable along a longitudinal direction of the rod-shaped member; a second movable portion held on the other end side of the rod-shaped member and slidable along the longitudinal direction of the rod-shaped member; Equipped with The rod-shaped member has a reference portion near the center in the longitudinal direction, is disposed approximately parallel to the extension and contraction direction of the friction damper, and is capable of sliding in the extension and contraction direction of the friction damper, the reference member is located on the reference portion of the rod-shaped member, does not change its position due to the sliding of the rod-shaped member, and is sandwiched between the first movable portion and the second movable portion; When the sliding of the rod-shaped member occurs, the first movable portion and the second movable portion slide toward the end of the rod-shaped member by contacting the reference member, The distance between the positions of the first and second movable parts and the reference part after the sliding stops can be recorded as a maximum displacement amount. A device for recording the maximum displacement of a friction damper.

2. The rod-shaped member is provided with fixing parts near both ends in the longitudinal direction thereof that can be attached to both ends in the extension / contraction direction of the friction damper.

2. The maximum displacement recording device according to claim 1.

3. The reference member has an opening that opens in the extension / contraction direction of the friction damper, and the rod-shaped member is inserted into the opening.

2. The maximum displacement recording device according to claim 1.

4. The first movable portion and the second movable portion have a shape that prevents them from passing through the opening.

4. The maximum displacement recording device according to claim 3.

5. The first movable portion and the second movable portion are formed with a through hole having an inner diameter corresponding to the outer diameter of the rod-shaped member, and the rod-shaped member is inserted into the through hole.

2. The maximum displacement recording device according to claim 1.

6. The rod-shaped members are connected in the longitudinal direction via a joint member provided between the first rod-shaped member and the second rod-shaped member, and the joint member has the reference portion colored in a color different from the colors of the first rod-shaped member and the second rod-shaped member on a surface exposed to the outside.

2. The maximum displacement recording device according to claim 1.

7. The maximum displacement recording device according to claim 1 is provided. A friction damper characterized by:

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