JP7459343B2 - Vibration damping braces and structures - Google Patents

Description

The present invention relates to a damping brace that includes an axial member that absorbs seismic energy when an earthquake occurs and a stiffening member that stiffens the brace, and a structure that includes a damping brace, and particularly relates to a structure that includes a displacement meter. .

Conventionally, vibration damping braces are installed in building structures as vibration dampers to absorb energy that causes vibrations in building structures, such as earthquake energy, and to reduce damage to main structural members such as columns and beams of building structures. be done. The damping brace is generally a buckling restraint brace, and is composed of an axial member, a stiffening member, and a mounting member for joining the axial member to the main frame. Due to the vibration of the building structure due to an earthquake, the buckling restraint brace is compressed in the axial direction. The axial compression of the buckling restraint brace is borne by the axial member of the buckling restraint brace. The buckling restraint brace includes a stiffening member that stiffens the deflection and buckling of the axial member so that the axial member is plastically deformed in the axial direction of the brace without buckling due to axial compression. The stiffener is provided so as to cover the periphery of the axial member as a buckling restraint material for the axial member without bearing the axial force input to the buckling restraint brace. Due to the above structure, the buckling restraint brace prevents or delays the occurrence of buckling of the entire axial member even when compressive axial force is applied, and produces stable axial deformation, thereby increasing the ability to absorb earthquake energy. It is designed to increase the size of the image.

When using steel as the axial member of a damping brace, it is necessary to consider the fatigue durability due to repeated loads and the limit of maximum expansion and contraction. In other words, in the event of a major earthquake, the remaining life of the damping brace is determined based on its fatigue durability and maximum expansion/contraction limits, and it is determined whether it can be used continuously or whether it needs to be replaced. This is very important. In order to measure the remaining life of a buckling restraint brace, a displacement meter (cumulative displacement meter or maximum displacement meter) that is attached to a buckling restraint brace is known. A case where the method is applied to a vibration damper is shown (see, for example, Patent Document 1 and Patent Document 2).

JP2017-128896A Japanese Patent Application Publication No. 2017-198539

According to Patent Document 1 and Patent Document 2, a cumulative displacement meter and a maximum displacement meter are attached to a vibration damper, and one end of a stiffener and an axial force member constituting the vibration damper are connected to each other. A displacement gauge is installed between the attached mounting member and the mounting member. This measures the relative displacement between one end of the stiffener and the attachment member. However, in these vibration dampers with displacement meters, the other end of the stiffener and the mounting member on the other end are not joined, and it is difficult to measure the relative displacement between the stiffener and the mounting member. Although it is possible, there is a problem with accuracy in measuring the amount of expansion and contraction of the entire length of the axial member. Therefore, there was a problem with the accuracy of determining the remaining life of the vibration damper, which is determined by the amount of expansion and contraction of the entire length of the axial member.

The present invention meets the above-mentioned needs, and an object of the present invention is to provide a damping brace and a structure equipped with a displacement meter that accurately measures the amount of expansion and contraction of the entire length of an axial member.

The damping brace according to the present invention includes an axial member, a stiffening member into which the axial member is inserted, and a first mounting member and a second mounting member joined to both ends of the axial member in the axial direction. , a displacement meter, the displacement meter is installed between the sliding side end that is one end of the stiffener and the second attachment member, and the displacement meter is installed between the sliding side end that is one end of the stiffener and the second mounting member, and the second attachment member, the first attachment member being joined to the stiffener via an end connector, and the other end of the stiffener being fixed. The side end portion is joined to the end connecting member and fixed to the first mounting member via the end connecting member , and the fixed side end of the stiffening member and the first mounting member are connected to each other. They are connected and fixed by a connecting plate .

In the structure according to the present invention, the first mounting member and the second mounting member of the vibration damping brace are connected to a mounting portion of a frame.

According to the present invention, the displacement meter is provided to measure the relative displacement between one end of the stiffener and the second mounting member, and the other end of the stiffener is fixed to the first mounting member. Therefore, the displacement meter can accurately measure the amount of expansion and contraction of the axial member, and the accuracy of determining the remaining life of the damping brace improves.

1 is a schematic diagram of an example of a structure in which a damping brace 50 according to Embodiment 1 is used. FIG. 2 is a front view of the pier 90 of FIG. 1. FIG. 1 is a side view of a vibration damping brace 100 with a displacement meter according to Embodiment 1. FIG. 4 is a diagram showing a cross section of the damping brace 50 of FIG. 3. FIG. 4 is a cross-sectional view of a fixed end 52a of a stiffener 52 of the vibration-damping brace 50 of FIG. 3. 4 is a cross-sectional view of the second mounting member 53b of the vibration-damping brace 50 of FIG. 3. FIG. 3 is a cross-sectional view of the fixing member 21 fixed to the sliding end portion 52b of the stiffener 52 of the damping brace 50 according to the first embodiment. FIG. 3 is a cross-sectional view of the second mounting member 53b of the damping brace 50 and the displacement meter 10 according to the first embodiment. FIG. 2 is an explanatory diagram showing an example of the internal structure of the displacement meter 10 according to the first embodiment. FIG. 7 is a side view showing a modification of the damping brace with displacement gauge 100 according to the first embodiment. FIG. 7 is a side view showing a modification of the damping brace with displacement gauge 100 according to the first embodiment. FIG. 7 is a side view showing a modification of the damping brace with displacement gauge 100 according to the first embodiment. FIG. 13 is a sectional view of the vibration damping brace 100c with a displacement meter shown in FIG. 12. FIG. 13 is a sectional view of the vibration damping brace 100c with a displacement meter shown in FIG. 12. FIG. 13 is a sectional view of the vibration damping brace 100c with a displacement meter shown in FIG. 12. 13 is a cross-sectional view of the vibration-damping brace 100c with displacement gauge of FIG. FIG. 3 is a side view of a vibration damping brace 200 with a displacement meter according to a second embodiment. FIG. 18 is a sectional view of the vibration damping brace 200 with a displacement meter shown in FIG. 17. FIG. 7 is a cross-sectional view of the damping brace 200 with a displacement meter according to Embodiment 2 when the stiffener 52 is displaced due to vibration.

Embodiments of the present invention will be described below based on the drawings. Note that the present invention is not limited to the embodiments described below. Each figure is shown schematically, and the relative size, plate thickness, etc. of each member are not limited to the illustrated dimensions. Further, in the following drawings, the size relationship of each component may differ from the actual one.

Embodiment 1.
FIG. 1 is a schematic diagram of an example of a structure in which a vibration-damping brace 50 according to the first embodiment is used. FIG. 2 is a front view of the pier 90 in FIG. 1. FIG. 2 shows the structure of the pier 90 from the viewpoint of the M direction in FIG. 1. The pier 90 is erected on a foundation 92 formed on the ground 93, and supports a bridge 91 spanning a valley in the ground 93. As shown in FIG. 2, the pier 90 is formed, for example, by connecting a beam 94 between two columns 96 in a direction perpendicular to the columns 96. The vibration-damping brace 50 is installed diagonally on the frame formed by the columns 96 and the beam 94. The mounting members 53 (see FIG. 3) provided at both ends of the vibration-damping brace 50 are connected to mounting parts 95 such as gusset plates provided at the center of the beam 94 and at the joint between the column 96 and the beam 94.

When the bridge 91 vibrates due to an earthquake or the like and is displaced in the direction of arrow W shown in FIG. 2, the piers 90 also vibrate and the frame is deformed. The vibration damping brace 50 expands and contracts as shown by arrow V due to deformation of the frame, and absorbs energy caused by vibration. Energy due to vibration is absorbed by plastically deforming the axial member 51 of the vibration damping brace 50. The vibration damping brace 50 absorbs energy due to vibration, thereby damping vibrations affecting the piers 90 and the bridge 91.

In the first embodiment, eight damping braces 50 are installed on the pier 90. Among them, one vibration damping brace is a vibration damping brace 100 with a displacement meter in which a displacement meter 10 is provided. By installing the vibration damping brace 100 with a displacement meter in at least one location among the vibration damping braces 50 installed on the pier 90, the administrator etc. who manage the vibration damping brace 50 can control the vibration damping brace 100 with a displacement meter. It is possible to know the amount of displacement or expansion/contraction that has occurred, especially the maximum amount of displacement and the amount of cumulative displacement. The damping brace 100 with a displacement meter allows an administrator or the like to determine the fatigue life from the maximum displacement amount and cumulative displacement amount measured by the displacement meter 10. For example, if at least one of the maximum displacement amount and the cumulative displacement amount is greater than or equal to a predetermined value, the damping brace 50 is replaced. Furthermore, by determining the fatigue life of the vibration damping brace 100 with a displacement meter, the life of other vibration damping braces 50 installed on the same pier 90 can also be predicted. That is, the lifespan of all the vibration damping braces 50 installed in the structure can be predicted by the displacement meter 10 of the vibration damping brace 100 installed in at least one location of the structure. Therefore, the damping brace 50 installed in the structure is replaced at an appropriate time, so that the safety and reliability of the structure can be maintained appropriately. Note that if the displacement meter 10 is installed on the damping brace 50 that has the largest displacement among all the damping braces 50, the time to replace the damping brace 50 can be predicted based on the measured value of the displacement. This is because the damping braces 50 other than the damping brace 50 on which the displacement meter 10 is installed have a smaller displacement and longer fatigue life than the damping brace 50 on which the displacement meter 10 is installed, so the life can be determined on the safe side. It is from.

The number and positions of the vibration-damping braces 50 installed on the pier 90 shown in FIG. 2 are merely examples and can be changed as appropriate. The vibration-damping brace 100 with displacement gauge and the vibration-damping brace 50 can be applied not only to the pier 90, but also to civil engineering structures such as water gates, and architectural structures such as buildings or towers.

(vibration damping brace 50)
FIG. 3 is a side view of the damping brace 100 with a displacement meter according to the first embodiment. FIG. 4 is a cross-sectional view of the damping brace 50 of FIG. 3. As shown in FIG. FIG. 4 is a cross section taken along the line AA in FIG. 3. The vibration damping brace 100 with a displacement meter is configured by attaching a displacement meter 10 to a vibration damping brace 50. The structure of the vibration damping brace 50 other than the structure for attaching the displacement meter 10 of the vibration damping brace 100 with a displacement meter is the same as the other vibration damping brace 50 shown in FIG.

As shown in FIG. 4, the damping brace 50 includes a cylindrical axial member 51 and a cylindrical stiffener 52 that covers the outer periphery of the axial member 51. The central axis L shown in FIG. 3 is the central axis of the damping brace 50, and is the same as the central axis of the axial member 51. The center axis of the stiffener 52 is also arranged concentrically with the center axis L. That is, the axial member 51 passes through the center of the cylindrical stiffener 52 in the longitudinal direction. The outer periphery of the axial member 51 is surrounded by a stiffening member 52 to restrain deformation. One end 51a of the axial member 51 in the longitudinal direction is joined to the fixed side cap 54a. Further, a fixed side end portion 52a, which is one end in the longitudinal direction of the stiffener 52, is connected to a first attachment member 53a, which is joined to the axial member 51 by the fixing member 41 and the connecting plate 40. . Thereby, the fixed side end 52a of the stiffener 52 is fixed so as not to be displaced relative to the first attachment member 53a.

The other end 51b of the axial member 51 in the longitudinal direction is joined to the sliding mouthpiece 54b. A sliding side end portion 52b, which is an end portion in the longitudinal direction of the stiffening member 52, is configured to be able to be displaced relative to the axial member 51 and the sliding side cap 54b. A predetermined gap is formed between the inner surface of the stiffener 52, the outer circumferential surface of the axial member 51, and the outer circumferential surface of the sliding side cap 54b, so that the load due to the deformation of the pier 90 is not applied to the vibration damping brace 50. Even if the axial force member 51 expands and contracts when a load is applied, the stiffener 52 is configured so that no load is applied in the direction of the central axis L.

The fixed side cap 54a and the sliding side cap 54b are joined to a mounting member 53 that protrudes in the opposite direction to the side to which the axial member 51 is joined. The mounting member 53 that is joined to the fixed side cap 54a may be referred to as a first mounting member 53a, and the one joined to the sliding side cap 54b may be referred to as a second mounting member 53b. The mounting member 53 serves as a joint for joining the damping brace 50 to a mounting portion 95 such as a gusset plate provided on a structure such as a bridge pier 90.

(Axial material)
The axial member 51 is an elongated steel member with a cylindrical cross section. In the first embodiment, the axial force member 51 is shown as a long steel member with a cylindrical cross section, but the axial force member 51 may be, for example, a steel bar or a flat plate joined to have a cross section. The cross-sectional shape of the damping brace 50 taken along a plane perpendicular to the central axis L is not limited. A fixed side cap 54a is joined to one end 51a of the axial member 51 in the longitudinal direction. Further, a sliding side cap 54b is joined to the other end 51b of the axial member 51 in the longitudinal direction.

The axial member 51 is formed of a plastically deformable material, and absorbs the energy input to the vibration damping brace 50 when the axial member 51 plastically deforms, thereby achieving higher earthquake resistance and a vibration damper effect. .

(Stiffener 52)
The stiffener 52 is, for example, a steel pipe with a cylindrical cross section, and has a structure in which the axial member 51 is passed through the inside of the pipe. Note that the stiffener 52 is not limited to a cylindrical shape. For example, a square tube with a rectangular cross section may be used as long as the deflection of the axial member 51 can be restrained so that it does not buckle when the axial member 51 is deflected by the axial force. The longitudinal dimension of the stiffener 52 is desirably longer than the longitudinal dimension of the axial member 51. Further, mortar or the like may be filled between the axial member 51 and the stiffening member 52 for stiffening. Furthermore, the stiffening member 52 may be formed by joining a plurality of square steel pipes to restrain the deflection of the axial member 51. The structure of the stiffener 52 can be changed as appropriate depending on the shape and deflection mode of the axial member 51.

FIG. 5 is a cross-sectional view of the fixed end 52a of the stiffener 52 of the damping brace 50 of FIG. FIG. 6 is a sectional view of the first attachment member 53a of the damping brace 50 of FIG. As shown in FIG. 5, the stiffener 52 is surrounded by two fixing members 41 from the outer periphery of the fixed end 52a. The two fixing members 41 are fastened and fixed to each other by bolts 42 and nuts 43 with the fixed side ends 52a of the connecting plate 40 and the stiffening member 52 sandwiched therebetween. The fixed side end portion 52a of the stiffener 52 is tightened by the two fixing members 41, and the fixing members 41 are fixed to the stiffening member 52 so as not to be displaced in the central axis L direction. The connecting plate 40 has one end fixed to the fixing member 41 so as not to be displaced in the direction of the central axis L, and the other end fixed to the first attachment member 53a via the attachment plate 60. Thereby, the fixed side end portion 52a of the stiffener 52 is fixed to the first attachment member 53a so as not to be displaced in the central axis L direction.

The sliding side end 52b, which is the other longitudinal end of the stiffener 52, has a gap in the radial direction with respect to the axial force member 51 and the sliding side cap 54b. It is configured to be able to be displaced relative to the side cap 54b. Therefore, even if the axial member 51 expands or contracts when a load due to the deformation of the pier 90 is applied to the damping brace 50, the stiffener 52 is configured so that no load is applied in the direction of the central axis L. That is, in the damping brace 50 of the first embodiment, no axial force (force acting in the direction of the central axis L of the damping brace 50) is input to the stiffener 52. Since no axial force is input to the stiffener 52, the stiffener 52 has a thickness and outer diameter that can restrain the buckling of the axial member 51, compared to the case where axial force is applied. The thickness can be reduced and the outer diameter can be made smaller. Thereby, there is no need to increase the size of the stiffener 52, and the cost and weight of the vibration damping brace 50 can be reduced.

(Displacement meter 10)
FIG. 3(a) shows a normal state where no load is applied to the vibration-damping brace 50 in the direction of the central axis L. FIG. 3(b) shows a state where a load is applied to the vibration-damping brace 50 such that the vibration-damping brace 50 expands in the direction of the central axis L. FIG. 3(c) shows a state where a load is applied to the vibration-damping brace 50 such that the vibration-damping brace 50 contracts in the direction of the central axis L. As described above, the vibration-damping brace 50 is configured such that the stiffener 52 does not undergo deformation because no axial force is applied, whereas the axial force member 51 can expand and contract under axial force. Therefore, the sliding side end 52b of the stiffener 52 is displaced in the direction of the central axis L relative to the second mounting member 53b to which the axial force member 51 is joined. In other words, when the axial force member 51 is deformed so as to expand by a distance δ as shown in FIG. 3(b), the sliding side end 52b of the stiffener 52 is displaced so as to move away from the second mounting member 53b by a distance δ. Furthermore, when the axial force member 51 is deformed so as to contract by a distance δ as shown in FIG. 3( c ), the sliding side end portion 52 b of the stiffening member 52 is displaced so as to approach the second mounting member 53 b by a distance δ.

The displacement meter 10 is attached to the damping brace 50 so as to be able to detect the relative displacement distance δ between the sliding end 52b of the stiffener 52 and the second attachment member 53b.

FIG. 7 is a sectional view of the fixing member 21 fixed to the sliding side end 52b of the stiffener 52 of the damping brace 50 according to the first embodiment. FIG. 8 is a sectional view of the second mounting member 53b of the damping brace 50 and the displacement meter 10 according to the first embodiment. The displacement meter 10 includes a main body 13 having a linear motion transmitting section 11, a rotational motion transmitting section 8 (see FIG. 9), a one-way rotation converting section 9 (see FIG. 9), and a cumulative displacement display section 12. , is provided. The linear motion transmitting section 11 moves linearly in the direction of the central axis L relative to the main body section 13. The rotary motion transmitting section 8 and the one-way rotation converting section 9 built into the main body part 13 convert the linear motion of the linear motion transmitting section 11 into one-way rotation. The cumulative displacement amount display section 12 displays the cumulative displacement of the linear motion transmitting section 11 by moving the pointer 32 (see FIG. 9) around the display rotation axis 31 (see FIG. 9) by rotating in one direction.

In other words, the displacement meter 10 displays the cumulative value of the relative displacement between the linear motion transmitting section 11 and the main body section 13. In the first embodiment, in order to determine the fatigue life of the damping brace 50, the relative displacement between the linear motion transmitting section 11 and the main body section 13 of the displacement meter 10 needs to match the amount of expansion and contraction of the axial member 51. be. Therefore, the main body portion 13 of the displacement meter 10 is fixed to the second attachment member 53b, and the linear motion transmission portion 11 is fixed to the sliding side end portion 52b of the stiffener 52. Thereby, the relative displacement between the second mounting member 53b and the sliding end portion 52b of the stiffener 52 matches the relative displacement between the linear motion transmitting portion 11 and the main body portion 13 of the displacement meter 10. The displacement meter 10 can display the cumulative amount of expansion and contraction of the axial member 51.

As shown in FIG. 7, the linear motion transmission part 11 is fixed to the sliding end part 52b of the stiffener 52. The sliding end part 52b of the stiffener 52 is surrounded on its outer periphery by a fixing member 21 composed of two members. The two members of the fixing member 21 sandwich the stiffener 52 and are fastened to each other by a bolt 42 and a nut 43, thereby being fixed to the sliding end part 52b of the stiffener 52. The linear motion transmission part 11 is fixed so as not to be displaced relative to the fixing member 21 in the direction of the central axis L. In other words, the linear motion transmission part 11 moves linearly in the direction of the central axis L together with the sliding end part 52b of the stiffener 52.

As shown in FIG. 8(a), the main body portion 13 includes a displacement meter fixing plate 16 formed to protrude from the housing. The displacement meter fixing plate 16 is sandwiched between the two displacement meter fixing attachment plates 20 from the plate surface direction, and is connected and fixed to the second mounting member 53b. In other words, the displacement meter fixing plate 20 is assembled with the displacement meter fixing plate 16 and the second mounting member 53b by sandwiching both the displacement meter fixing plate 16 and the second mounting member 53b and tightening the bolts 42 and nuts 43. 2 mounting member 53b are integrated. Further, as shown in FIG. 3, the displacement meter fixing attachment plate 20 connects the second attachment member 53b and an attachment portion 95 formed on the structure. That is, the displacement meter fixing attachment plate 20 also has the function of the attachment plate 60.

FIGS. 8(b) and 8(c) are cross-sectional views showing a modification of the structure of the joint portion between the displacement meter fixing plate 16 and the second mounting member 53b. As shown in FIG. 8(b), the displacement meter fixing splice plate 20 is used only on one side of the displacement meter fixing plate 16, and one displacement meter fixing splice plate 20 and one splice plate 60 are used. The displacement meter fixing plate 16 and the second mounting member 53b may be connected by. That is, the displacement meter fixing plate 16 and one displacement meter fixing attachment plate 20 are connected and fixed, and the one attachment plate 60 and displacement meter fixing attachment plate 20 are connected and fixed to the second mounting member 53b. , connects the displacement meter fixing plate 16 and the second mounting member 53b. At this time, one displacement meter fixing attachment plate 20 and one attachment plate 60 have a function of connecting the second attachment member 53b and the attachment part 95 of the pier 90. According to this configuration, the displacement meter 10 can be installed or removed from the damping brace 50 while the displacement meter fixing attachment plate 20 is fixed to the second attachment member 53b.

As shown in FIG. 8(c), the displacement meter fixing plate 16 may be directly attached to the second attachment member 53b. At this time, the displacement meter fixing plate 16 is directly fixed to the plate surface of the second mounting member 53b by bolts 42 and nuts 43. With this configuration, the number of parts at the joint between the displacement meter fixing plate 16 and the second attachment member 53b can be reduced, and the work of attaching the displacement meter 10 can also be facilitated. At this time, the displacement meter fixing plate 16 has the functions of the displacement meter fixing attachment plate 20 and the attachment plate 60. That is, the displacement meter fixing plate 16 is joined to both the second mounting member 53b and the mounting portion 95 of the pier 90. The displacement meter fixing plate 16 fixes the second mounting member 53b to the mounting portion 95 together with the attachment plate 60 that faces each other with the second mounting member 53b interposed therebetween.

(Cumulative Displacement Measurement by Displacement Gauge 10)
9 is an explanatory diagram showing an example of the internal structure of the displacement gauge 10 according to embodiment 1. As shown in Fig. 3, the relative displacement between the stiffener 52 and the second mounting member 53b is caused by the axial expansion and contraction displacement of the axial force member 51. The axial expansion and contraction displacement of the axial force member 51 is caused by the compressive and tensile axial loads acting in the axial direction of the vibration-damping brace 50.

Figure 9(a) shows the operation of the accumulated displacement display unit 12 when the axial force member 51 is displaced in the tensile direction, and Figure 9(b) shows the operation of the accumulated displacement display unit 12 when the axial force member 51 is displaced in the compressive direction. In Figures 9(a) and (b), R1 indicates clockwise rotation from the perspective of arrow R, and R2 indicates counterclockwise rotation.

When the axial force member 51 is displaced in the tensile direction, as shown in FIG. 9(a), the forward movement of the linear motion transmission unit 11 causes the pinion 70 meshing with the rack teeth to rotate forward, and the rotation of this pinion 70 is transmitted to the worm gear 71 via the worm 81 as rotation in the R1 direction.

The rotation in the R1 direction transmitted to the worm gear 71 is transmitted as rotation in the R2 direction to the first branch gear 74 via the first one-way clutch 72 and the first clutch gear 73. The rotation in the R2 direction transmitted to the first branch gear 74 is transmitted to the composite gear 76 as rotation in the R1 direction via the second branch gear 75.

Then, the rotation in the R1 direction transmitted to the composite gear 76 is transmitted to the display rotating shaft 31 via the output shaft 77, so that the pointer 32 of the cumulative displacement amount display section 12 indicates that the axial member 51 is in the tensile direction. It rotates clockwise by a predetermined angle as the cumulative amount of displacement when it is displaced.

Further, when the axial member 51 is displaced in the compression direction, the pinion 70 meshing with the rack teeth rotates in the opposite direction due to the return operation of the linear motion transmission section 11, as shown in FIG. 9(b). The rotation is transmitted to the worm gear 71 via the worm 81 as rotation in the R2 direction.

The rotation in the R2 direction transmitted to the worm gear 71 is transmitted as rotation in the R1 direction to the third branch gear 80 via the second one-way clutch 78 and the second clutch gear 79. The rotation in the R1 direction transmitted to the third branch gear 80 is transmitted to the composite gear 76 coaxially fixed to the output shaft 77 as rotation in the R1 direction.

Then, the rotation in the R1 direction transmitted to the composite gear 76 is transmitted to the display rotation shaft 31 via the output shaft 77, so that the pointer 32 of the cumulative displacement amount display section 12 indicates that the axial member 51 is in the compression direction. It rotates clockwise by a predetermined angle as the cumulative amount of displacement when it is displaced.

Here, the portion from the pinion 70 to the worm 81 that meshes with the linear motion transmitting section 11 constituted by a rack is referred to as the rotational motion transmitting section 8. Further, a portion from the worm gear 71 to the composite gear 76 via the first one-way clutch 72 or the second one-way clutch 78 is referred to as a one-way rotation conversion section 9. The one-way rotation converting section 9 converts the rotational motion of the rotational motion transmitting section 8, which rotates in both forward and reverse directions, into one-way rotation.

By having the mechanism described above, the displacement meter 10 can measure the cumulative displacement due to the reciprocating linear motion due to the expansion and contraction of the axial member 51, and display it on the cumulative displacement amount display section 12.

(Maximum displacement measurement using displacement meter 10)
The displacement meter 10 includes a compression side displacement display member 14 and a tension side displacement display member 15. The compression-side displacement display member 14 is slidably engaged with the side surface of the linear motion transmitting portion 11 on the stiffener 52 side, which passes through the main body portion 13, and the rack teeth. The compression side displacement display member 14 is a gate-shaped or ring-shaped member that is stopped on the linear motion transmitting portion 11 when not in contact with the main body portion 13 . When the axial member 51 is displaced in the compression direction, the compression-side displacement display member 14 hits a part of the side surface of the main body 13 facing the stiffener 52, as shown in FIG. 3(c). It slides on the linear motion transmitting part 11 toward the end while touching it.

The tension side displacement display member 15 is slidably engaged with the side surface and rack teeth of the linear motion transmitting section 11 that protrudes toward the free end side of the linear motion transmitting section 11 passing through the main body section 13 . Further, the tension-side displacement display member 15 is a gate-shaped or ring-shaped member that stops on the linear motion transmitting portion 11 when not in contact with the main body portion 13 . When the axial force member 51 is displaced in the tensile direction, the tension-side displacement display member 15 is in contact with a part of the side surface 17b of the main body 13 on the opposite side to the side surface 17a described above. It slides toward the free end of the.

The compression side displacement display member 14 and the tension side displacement display member 15 do not transmit linear motion even after returning to the normal state shown in FIG. 3(a) after going through the states of FIGS. 3(b) and 3(c). The position on section 11 is maintained as it is. Therefore, the moving distance from the initial positions of the compression side displacement display member 14 and the tension side displacement display member 15, that is, the positions of the compression side displacement display member 14 and the tension side displacement display member 15 shown in FIG. The maximum value of expansion and contraction of the axial member 51 is shown. That is, the displacement meter 10 includes a maximum displacement display section that displays the maximum value of relative displacement using the compression side displacement display member 14 and the tension side displacement display member 15.

(Effect of vibration damping brace 100 with displacement meter)
As described above, the damping brace 100 with a displacement meter according to the first embodiment includes the axial force member 51, the stiffener 52 into which the axial force member 51 is inserted, and the axial direction of the axial force member 51. The first mounting member 53a and the second mounting member 53b are respectively joined to both ends of the stiffener 52, and the displacement meter 10 is installed on the sliding side end 52b of the stiffener 52 and the second mounting member 53b. The fixed end 52a of the stiffener 52 is fixed so as not to be displaced relative to the first attachment member 53a.
Further, the stiffener 52 is a steel pipe, and the fixed end 52a of the stiffener 52 and the first attachment member 53a are connected and fixed by a connecting plate 40.
With this configuration, the stiffener 52 is fixed so as not to be displaced relative to the first attachment member 53a at one end of the damping brace 50. Therefore, by measuring the relative displacement between the second attachment member 53b at the other end of the damping brace 50 and the stiffening member 52, the expansion and contraction of the axial member 51 can be measured with high accuracy.

Further, the displacement meter 10 includes a linear motion transmission section 11 , a rotational motion transmission section 8 , a one-way rotation conversion section 9 , and a cumulative displacement amount display section 12 . The linear motion transmitting section 11 moves linearly in the axial direction of the axial member 51 according to the relative displacement between the sliding end 52b of the stiffening member 52 and the second mounting member 53b, and the rotary motion transmitting section 8 moves linearly in the axial direction of the axial force member 51. , converts the linear motion of the linear motion transmission section 11 into rotational motion, and the one-way rotation conversion section 9 is composed of a plurality of rotating elements, and converts the rotation in the forward and reverse directions transmitted from the rotational motion transmission section 8 into one-way rotation. Convert to The cumulative displacement amount display section 12 displays the accumulation of relative displacements as a cumulative displacement amount using the unidirectional rotation transmitted from the unidirectional rotation conversion section 9.
Further, the displacement meter 10 includes a main body 13 having a rotational motion transmission section 8, a one-way rotation conversion section 9, and a cumulative displacement amount display section 12, and is fixed to the second mounting member 53b. The linear motion transmitting portion 11 is connected to the sliding end portion 52b of the stiffening member 52 by the fixing member 21.
With the above configuration, the displacement meter 10 is fixed to the second mounting member 53b connected to the mounting portion 95 of a structure such as the bridge pier 90. Therefore, the displacement meter 10 is installed in a relatively stable part even when the pier 90 vibrates, and damage and erroneous measurements due to vibration can be suppressed. In particular, since the stiffener 52 is joined only at one end in the longitudinal direction, the sliding end 52b is easily affected by vibration.

In the first embodiment, the displacement meter 10 is attached to the vibration damping brace 50 by fixing the displacement meter fixing plate 16 to the second mounting member 53b, so that the displacement meter 10 is attached to the vibration damping brace 50 after the vibration damping brace 50 is installed on the structure. Even in this case, the displacement meter 10 can be installed on the damping brace 50. Therefore, the vibration damping brace 50 can be manufactured, procured, and installed in advance before the specifications of the displacement meter 10 are determined. Therefore, the construction period for installing the damping brace 100 with a displacement meter can be shortened. Further, after installing a plurality of damping braces 50 on a structure such as the pier 90, it is possible to determine which damping brace 50 the displacement meter 10 is attached to. Furthermore, by fixing the second mounting member 53b and the displacement meter fixing plate 16 by bolt connection, there is an advantage that inspection, repair, and replacement of the displacement meter 10 becomes easier. The second mounting member 53b of the vibration damping brace 50 is fixed to a mounting portion 95 such as a gusset plate of the pier 90 using an attachment plate 60. By simply changing to the contact plate 20, it can be installed on the second mounting member 53b.

In addition, as shown in FIG. 2, by installing the vibration damping brace 100 with a displacement meter on the structure so that the side where the displacement meter 10 is installed is located downward, it is possible to inspect the vibration damping brace 50 and There is an advantage that the operator can easily check the displacement meter 10 even when replacing it. In addition, by placing the vibration damping brace 50 with the displacement meter 10 side facing down, the sliding side end 52b of the stiffener 52 that is open faces downward, so rainwater can flow onto the stiffener 52. It is difficult to penetrate and prevents stagnation. Thereby, corrosion of each member constituting the vibration damping brace 50 can be suppressed.

(Modification of vibration-damping brace 100 with displacement meter)
10 is a side view showing a modified example of the vibration-damping brace with displacement gauge 100 according to embodiment 1. The vibration-damping brace with displacement gauge 100a according to the modified example is a vibration-damping brace 50a with a displacement gauge 10 installed thereon. The vibration-damping brace 50a has the same mounting structure between the sliding side end 52b of the stiffening material 52 and the displacement gauge 10 as the vibration-damping brace 50, but differs in that the fixed side end 52a of the stiffening material 52 is fixed to the fixed side mouthpiece 54a by a joining means such as welding 44.

FIG. 11 is a side view showing a modification of the damping brace with displacement gauge 100 according to the first embodiment. A vibration damping brace with a displacement meter 100b according to a modified example is one in which a displacement meter 10 is installed on a vibration damping brace 50b. The damping brace 50b has the same mounting structure between the sliding end 52b of the stiffener 52 and the displacement meter 10 as the damping brace 50, but the fixed end 52a of the stiffener 52 is the same as the damping brace 50. The difference is that it is joined to the first mounting member 53a via a connecting member 45. The end connecting member 45 is joined to the opening of the fixed end 52a of the cylindrical stiffener 52 by means such as welding. A first mounting member 53a is fixed to the end connecting member 45 by a joining means such as welding 44.

As shown in FIGS. 10 and 11, the vibration damping brace 100 with a displacement meter according to the first embodiment can fix the stiffener 52 not by the connecting plate 40 but also by a joining means such as welding. You can get the same effect as.

FIG. 12 is a side view showing a modification of the damping brace with displacement gauge 100 according to the first embodiment. 13, FIG. 14, FIG. 15, and FIG. 16 are cross-sectional views of the damping brace with displacement gauge 100c of FIG. 12. 13 shows a section taken along the line PP in FIG. 12, FIG. 14 shows a section taken along a line QQ in FIG. 12, FIG. 15 shows a section taken along a line RR in FIG. 12, and FIG. There is. A vibration damping brace with a displacement meter 100c according to a modified example is one in which a displacement meter 10 is installed in a vibration damping brace 50c. The damping brace 50c is different from the damping braces 50, 50a, and 50b and is composed of a plate-shaped member. The axial member 151 of the damping brace 50c is made of a plate-shaped steel material as shown in FIG. 13, and is sandwiched between two stiffeners 152 from the surface direction of the plate, thereby causing buckling deformation due to expansion and contraction. is suppressed. The stiffener 152 is a member having a T-shaped cross section, and has high rigidity in the direction of the surface facing the surface of the axial member 151. Two spacers 57 are sandwiched between two stiffening members 152 that are arranged symmetrically with the axial member 151 in between, in parallel with the axial member 151. The two stiffeners 152 and the spacer 57 are fastened and fixed with bolts 42 and nuts 43. The axial member 151 is surrounded by the stiffening member 152 and the spacer 57 and arranged with a gap between them, and is arranged so as to be able to expand and contract in the direction of the central axis L.

As shown in FIG. 14, the fixed end 152a of the stiffener 152 is fixed to a first mounting member 53a formed integrally with the axial member 151 with bolts 42 and nuts 43. The fixed side end 152a of the stiffener 152 is fixed to the first mounting member 53a so as not to be displaced relative to the central axis L direction.

As shown in FIG. 15, the second mounting member 53b formed integrally with the axial member 151 is installed so that the sliding pin 56 protrudes in the surface direction. The sliding pin 56 is inserted into a long hole 55 provided in the stiffener 52, and is configured to be movable in the direction of the central axis L. In other words, the second attachment member 53b is configured to be movable in the direction of the central axis L relative to the sliding end 52b of the stiffener 52. In other words, even if the axial member 151 expands or contracts under load in the direction of the central axis L, the structure is such that the load is not transmitted to the stiffening member 52.

As shown in FIG. 16, the sliding end portion 152b of the stiffener 152 sandwiches the fixing member 21 between the stiffeners 152 and fixes it with bolts 42 and nuts 43. The linear motion transmitting section 11 is fixed to the fixed member 21 . Similar to the damping brace 100 with a displacement meter according to the first embodiment, the displacement meter 10 is fixed to the second mounting member 53b, so that the displacement meter 10 is aligned with the main body 13 of the displacement meter 10 in a straight line due to the expansion and contraction of the axial member 151. The motion transmitting section 11 is displaced relative to the motion transmitting section 11. Thereby, the displacement meter 10 can measure the cumulative displacement due to expansion and contraction of the axial member 151.

According to the vibration damping brace 100c with a displacement meter according to the modified example, the axial force member 151 and the stiffener 152 are constituted by plate-shaped members, and the fixed side end 152a of the stiffener 152 and the first mounting member 53a is fixed by a bolt 42, and the sliding side end 152b of the stiffening member 152 and the axial member 151 are configured to be slidable. Even with this configuration, the same effects as in the first embodiment can be obtained.

Embodiment 2.
Embodiment 2 differs from the vibration damping brace 100 with a displacement meter according to Embodiment 1 in that a fixing member 21 attached to the linear motion transmitting section 11 of the displacement meter 10 and the sliding side end 52b of the stiffener 52 is used. The connection structure has been changed. In the second embodiment, changes to the first embodiment will be mainly described.

FIG. 17 is a side view of a damping brace 200 with a displacement meter according to the second embodiment. FIG. 18 is a sectional view of the vibration damping brace 200 with a displacement meter shown in FIG. 17. FIG. 18 is a cross section taken along line GG in FIG. 17. A long hole 222 having a long diameter in the direction perpendicular to the central axis L is formed in the fixed member 221 attached to the sliding side end 52b of the stiffener 52 of the damping brace 50 according to the second embodiment. . The linear motion transmitting section 211 included in the displacement meter 10 is provided with a motion transmitting pin 223 at its end, and is configured to be movable within the elongated hole 222 in a direction perpendicular to the central axis L. Further, the motion transmission pin 223 and the elongated hole 222 are configured to have a small gap in the direction of the central axis L. Therefore, when a relative displacement occurs between the sliding end portion 52b of the stiffening member 52 and the first mounting member 53a due to expansion and contraction of the axial member 51, the motion transmission pin 223 and the elongated hole 222 will come into contact with each other. The linear motion transmitting section 211 is configured to move as the linear motion transmitting section 211 moves.

FIG. 19 is a cross-sectional view of the damping brace 200 with a displacement meter according to the second embodiment when the stiffener 52 is displaced due to vibration. FIG. 19 is a cross section taken along line GG in FIG. 17. The damping brace 50 has a gap between the stiffening member 52 and the axial member 51. As shown in FIG. 17, the stiffener 52 is fixed to the first mounting member 53a at the fixed end 52a, but the sliding end 52b is the free end of the cantilever. Therefore, the sliding end portion 52b of the stiffener 52 is likely to be displaced in the direction perpendicular to the central axis L of the axial member 51 due to the vibration of the pier 90. Therefore, there is a displacement in the direction perpendicular to the central axis L between the linear motion transmitting part 211 of the displacement meter 10 fixed to the second mounting member 53b and the fixed member 221 fixed to the sliding side end 52b. occurs.

If the fixed member 221 and the linear motion transmission unit 211 are fixed so that they cannot be displaced relative to each other, the relative displacement between the sliding end 52b of the stiffener 52 and the second mounting member 53b may cause a load to be applied to the internal structure of the linear motion transmission unit 211 or the displacement meter 10, resulting in damage to parts and erroneous measurement of displacement. For example, if the linear motion transmission unit 211 is composed of a rack member, the rack member may be bent in a direction perpendicular to the central axis L, causing damage to the rack member or damage and malfunction of the meshing portion between the rack and the pinion 70 inside the main body 13 of the displacement meter 10. However, according to the vibration-damping brace 200 with displacement meter according to embodiment 2, the fixed member 221 and the linear motion transmission unit 211 are structured so that they can be displaced relative to each other in a direction perpendicular to the central axis L, and therefore the cumulative displacement and maximum displacement of the vibration-damping brace 50 can be measured with high accuracy without being affected by the vibration of structures such as the pier 90, and damage to the displacement meter 10 can be suppressed.

8 rotational motion transmission section, 9 one-way rotation conversion section, 10 displacement meter, 11 linear motion transmission section, 12 cumulative displacement amount display section, 13 main body section, 14 compression side displacement display member, 15 tension side displacement display member, 16 displacement meter fixing plate, 17a side surface, 17b side surface, 20 displacement meter fixing attachment plate, 21 fixing member, 31 display rotating shaft, 32 pointer, 40 connecting plate, 41 fixing material, 42 bolt, 43 nut, 45 end connecting material, 50 damping brace, 50a damping brace, 50b damping brace, 50c damping brace, 51 axial member, 51a end, 51b other end, 52 stiffening material, 52a fixed side end, 52b sliding side End, 53 mounting member, 53a first mounting member, 53b second mounting member, 54a fixed side cap, 54b sliding side cap, 55 long hole, 56 sliding pin, 57 spacer, 60 splicing plate, 70 pinion, 71 worm gear, 72 first one-way clutch, 73 first clutch gear, 74 first branch gear, 75 second branch gear, 76 composite gear, 77 output shaft, 78 second one-way clutch, 79 second clutch gear, 80 th 3-branch gear, 81 Worm, 90 Pier, 91 Bridge, 92 Foundation, 93 Ground, 94 Beam, 95 Mounting part, 96 Column, 100 Vibration damping brace with displacement meter, 100a Vibration damping brace with displacement meter, 100b System with displacement meter Vibration brace, 100c Vibration damping brace with displacement gauge, 151 Axial member, 152 Stiffener, 152a Fixed side end, 152b Sliding side end, 200 Vibration damping brace with displacement gauge, 211 Linear motion transmission part, 221 Fixed Member, 222 Long hole, 223 Motion transmission pin, L Central axis, R Arrow, V Arrow, W Arrow, δ distance.

Claims (13)

An axial member,
a stiffener into which the axial member is inserted;
a first mounting member and a second mounting member joined to both ends of the axial member in the axial direction;
Equipped with a displacement meter,
The displacement meter is
The stiffener is installed between the sliding side end, which is one end of the stiffener, and the second mounting member, and is configured to prevent relative displacement between the one end of the stiffener and the second mounting member. measure,
The first mounting member is
joined to the stiffening material via an end connecting material,
The other end of the stiffener, the fixed side end, is
joined to the end connecting material and fixed to the first mounting member via the end connecting material ;
Between the fixed end of the stiffener and the first mounting member,
A vibration damping brace that is connected and fixed by a connecting plate . The axial force member and the stiffener are
The plate-shaped member is
The fixed end of the stiffener and the first attachment member are
It is fixed by bolts,
The sliding side end portion of the stiffener and the axial force member are
The vibration-damping brace according to claim 1 , which is configured to be freely slidable. The displacement meter is
comprising a linear motion transmission section, a rotational motion transmission section, a one-way rotation conversion section, and a cumulative displacement amount display section,
The linear motion transmission section is
linearly moving in the axial direction of the axial member in response to the relative displacement between the one end of the stiffener and the second attachment member;
The rotational motion transmission section is
converting the linear motion of the linear motion transmitting unit into rotational motion;
The one-way rotation converter is
It is composed of a plurality of rotating elements, and converts rotation in forward and reverse directions transmitted from the rotational motion transmission section into unidirectional rotation,
The cumulative displacement amount display section is
The damping brace according to claim 1 or 2 , wherein the unidirectional rotation transmitted from the unidirectional rotation converter is used to display the accumulation of the relative displacement as a cumulative displacement amount. The displacement meter is
comprising a main body having the rotational motion transmission section, the one-way rotation conversion section, and the cumulative displacement amount display section,
fixed to the second mounting member,
The linear motion transmission section is
The damping brace according to claim 3 , wherein the damping brace is connected to the sliding end of the stiffener by a fixing member. The linear motion transmission section is
connected to the fixed member so as to be movable in a direction perpendicular to the axial direction of the axial member;
The damping brace according to claim 4 , wherein the damping brace is connected to be displaced together with the fixed member in the axial direction of the axial member. The fixing member is
A long hole having a long diameter in a direction perpendicular to the axial direction of the axial member,
The linear motion transmission section is
The damping brace according to claim 5 , comprising a motion transmission pin inserted into the elongated hole. The main body portion of the displacement meter is
comprising a displacement meter fixing plate protruding from the main body,
The displacement meter fixing plate is
The damping brace according to any one of claims 4 to 6 , which is fixed to the second mounting member. The displacement meter fixing plate is
The damping brace according to claim 7 , wherein the damping brace is fixed to the second mounting member via a displacement meter fixing attachment plate. The displacement meter is
The vibration-damping brace according to any one of claims 3 to 8 , further comprising a maximum displacement display unit that displays the maximum value of the relative displacement. A structure, wherein the first mounting member and the second mounting member of the damping brace according to any one of claims 1 to 9 are connected to a mounting portion of a frame. The displacement meter fixing plate is
11. The structure according to claim 10 , which is integrally formed with a joining plate that joins the second mounting member and the mounting portion. The displacement meter fixing attachment plate is
11. The structure according to claim 10 , which is integrally formed with a joining plate that joins the second mounting member and the mounting portion. The vibration damping brace is
The structure according to any one of claims 10 to 12 , wherein the structure is installed so that the second mounting member on which the displacement gauge is located is located below.

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