JP7263142B2 - Damping braces and structures - Google Patents

Description

TECHNICAL FIELD The present invention relates to a vibration control brace having an axial force member for absorbing seismic energy when an earthquake occurs and a stiffener for stiffening the same, and a structure provided with the vibration control brace, and more particularly to a structure provided with a displacement gauge. .

Conventionally, vibration control braces are installed in building structures as vibration control dampers to absorb energy that vibrates building structures, such as seismic energy, and reduce damage to main structural members such as columns and beams of building structures. be done. A 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. Vibration of the building structure due to an earthquake compresses the buckling restraint brace axially. Axial compression of the buckling-restrained brace is borne by the axial members of the buckling-restrained brace. A buckling restrained brace includes stiffeners that stiffen deflection and buckling of the axial members so that axial compression causes the axial members to plastically deform in the axial direction of the brace without buckling. The stiffening member is provided so as to cover the periphery of the axial force member as a buckling restraint member of the axial force member without bearing the axial force input to the buckling restraint brace. With the above structure, the buckling restraint brace prevents or delays the occurrence of overall buckling of the axial force member even when a compressive axial force is applied, thereby producing stable axial deformation and improving the seismic energy absorption capacity. is designed to increase

When steel is used as the axial force material for damping braces, it is necessary to consider the limits of fatigue durability and maximum expansion and contraction due to repeated loads. In other words, when subjected to the action of a large earthquake, the remaining life of the damping brace is grasped with respect to the limit values of fatigue durability and maximum expansion and contraction, and it is determined whether it is possible to continue using it or whether it is necessary to replace it. This is very important. In order to measure the remaining life of a buckling restraint brace, a displacement gauge (cumulative displacement gauge or maximum displacement gauge) attached to the buckling restraint brace is known. A case of application to a vibration control damper has been shown (see, for example, Patent Documents 1 and 2).

JP 2017-128896 A JP 2017-198539 A

According to patent documents 1 and 2, a cumulative displacement gauge and a maximum displacement gauge are attached to a vibration damper, and one end of a stiffening member and an axial force member constituting the vibration damper A displacement gauge is mounted between the attached mounting member. This measures the relative displacement between one end of the stiffener and the mounting member. However, in these vibration control dampers with displacement gauges, the other end of the stiffener and the mounting member on the other end side are not joined, and the relative displacement between the stiffener and the mounting member cannot be measured. Although it is possible, there was a problem in accuracy as a measurement of the amount of expansion and contraction of the full length of the axial force material. Therefore, there is a problem with the accuracy of determining the remaining life of the vibration damper, which is grasped by the amount of expansion and contraction of the entire length of the axial force material.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a damping brace and a structure equipped with a displacement gauge for accurately measuring the amount of expansion and contraction of the axial force member over the entire length.

A damping brace according to the present invention includes an axial force member, a stiffening member into which the axial force member is inserted, and a first mounting member and a second mounting member joined to both axial ends of the axial force member. , and a displacement meter, the displacement meter being installed between the sliding side end, which is one end of the stiffener, and the second mounting member, and the one end of the stiffener and the second mounting member, the other end of the stiffener being fixed to the first mounting member , the stiffener being a steel pipe A connection plate is provided between the fixed-side end of the stiffener and the first mounting member .
Further, the vibration damping brace according to the present invention includes an axial force member, a stiffening member in which the axial force member is inserted, a first mounting member and a second mounting member that are joined to both ends of the axial force member in the axial direction. a member and a displacement gauge, wherein the displacement gauge is installed between the sliding side end, which is one end of the stiffener, and the second mounting member; Relative displacement between the end and the second mounting member is measured, and the other end of the stiffener, the fixed end, is fixed to the first mounting member, and the axial force member and the The stiffening member is configured by a plate-like member, the fixed side end of the stiffening member and the first mounting member are fixed by bolts, and the sliding side end of the stiffening member and the first mounting member are fixed to each other by bolts. The axial force member is configured to be slidable.
Further, the vibration damping brace according to the present invention includes an axial force member, a stiffening member in which the axial force member is inserted, a first mounting member and a second mounting member that are joined to both ends of the axial force member in the axial direction. a member and a displacement gauge, wherein the displacement gauge is installed between the sliding side end, which is one end of the stiffener, and the second mounting member; The relative displacement between the end and the second mounting member is measured, the first mounting member is joined to the stiffener via a fixed mouthpiece, the stiffener is a steel pipe, and the The fixed-side end, which is the other end of the stiffener, is welded to the fixed-side mouthpiece and fixed to the first mounting member via the fixed-side mouthpiece.
Further, the vibration damping brace according to the present invention includes an axial force member, a stiffening member in which the axial force member is inserted, a first mounting member and a second mounting member that are joined to both ends of the axial force member in the axial direction. a member and a displacement gauge, the displacement gauge linearly moving in the axial direction of the axial force member according to the relative displacement between the one end of the stiffener and the second mounting member. A linear motion transmission unit, a rotary motion transmission unit that converts the linear motion of the linear motion transmission unit into rotary motion, and a plurality of rotary elements, and transmits forward and reverse rotation transmitted from the rotary motion transmission unit. a unidirectional rotation converting unit that converts to unidirectional rotation; an accumulated displacement amount display unit that displays the accumulation of the relative displacement as an accumulated displacement amount using the unidirectional rotation transmitted from the unidirectional rotation converting unit; A main body portion having the rotational motion transmission portion, the one-way rotation conversion portion, and the cumulative displacement amount display portion is provided, and the sliding side end portion, which is one end portion of the stiffener, and the second mounting member. The fixed end, which is the other end of the stiffener, is positioned between and measures the relative displacement between one end of the stiffener and the second mounting member, the other end of the stiffener being located between the 1 mounting member, the main body portion is fixed to the second mounting member, and the linear motion transmission portion is connected to the sliding side end portion of the stiffener by a fixing member.

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

According to the invention, a displacement gauge is provided for measuring the relative displacement between one end of the stiffener and the second mounting member, the other end of the stiffener being fixed to the first mounting member. Therefore, the displacement gauge can accurately measure the amount of expansion and contraction of the axial force member, and the accuracy of determining the remaining life of the damping brace is improved.

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 bridge pier 90 of FIG. 1; FIG. 1 is a side view of the damping brace with displacement gauge 100 according to Embodiment 1. FIG. 4 is a view showing a cross section of the damping brace 50 of FIG. 3; FIG. FIG. 4 is a cross-sectional view of a fixed side end portion 52a of a stiffener 52 of the damping brace 50 of FIG. 3; FIG. 4 is a cross-sectional view of a second mounting member 53b of the damping brace 50 of FIG. 3; FIG. 4 is a cross-sectional view of the fixing member 21 fixed to the sliding-side end portion 52b of the stiffener 52 of the damping brace 50 according to Embodiment 1; 5 is a cross-sectional view of the second mounting member 53b and the displacement gauge 10 of the damping brace 50 according to Embodiment 1. FIG. 2 is an explanatory diagram showing an example of the internal structure of the displacement meter 10 according to Embodiment 1; FIG. FIG. 4 is a side view showing a modification of the damping brace with displacement gauge 100 according to Embodiment 1; FIG. 4 is a side view showing a modification of the damping brace with displacement gauge 100 according to Embodiment 1; FIG. 4 is a side view showing a modification of the damping brace with displacement gauge 100 according to Embodiment 1; FIG. 13 is a cross-sectional view of the damping brace with displacement gauge 100c of FIG. 12; FIG. 13 is a cross-sectional view of the damping brace with displacement gauge 100c of FIG. 12; FIG. 13 is a cross-sectional view of the damping brace with displacement gauge 100c of FIG. 12; FIG. 13 is a cross-sectional view of the damping brace with displacement gauge 100c of FIG. 12; FIG. 11 is a side view of the damping brace with displacement gauge 200 according to Embodiment 2; FIG. 18 is a cross-sectional view of the damping brace 200 with a displacement gauge of FIG. 17; FIG. 10 is a cross-sectional view when the damping brace with displacement gauge 200 according to Embodiment 2 receives vibration and the stiffener 52 is displaced.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the present invention is not limited by the embodiments described below. Each figure is shown schematically, and the relative size, plate thickness, etc. of each member are not limited to the dimensions shown in the figure. Also, in the following drawings, the size relationship of each component may differ from the actual size.

Embodiment 1.
FIG. 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. FIG. 2 shows the structure of the bridge pier 90 viewed from direction M in FIG. The bridge pier 90 is erected on a foundation 92 formed on the ground 93 and supports a bridge 91 that spans the valley of the ground 93 . As shown in FIG. 2, the bridge pier 90 is formed by connecting, for example, two pillars 96 with a beam 94 extending in a direction orthogonal to the pillars 96 . A damping brace 50 is obliquely installed on the frame formed by the pillars 96 and the beams 94 . Mounting members 53 (see FIG. 3) provided at both ends of the damping brace 50 are joined to mounting portions 95 such as gusset plates provided at the central portion of the beam 94 and at the joint portion between the column 96 and the beam 94. ing.

When the bridge 91 vibrates due to an earthquake or the like and is displaced in the direction of the arrow W shown in FIG. 2, the piers 90 also vibrate and the frame is deformed. The damping brace 50 expands and contracts as indicated by the arrow V due to deformation of the frame, and absorbs energy due to vibration. Absorption of energy due to vibration is performed by plastic deformation of the axial member 51 of the damping brace 50 . The damping braces 50 absorb the energy of the vibrations, thereby damping the vibrations on the bridge piers 90 and bridges 91 .

In Embodiment 1, the bridge pier 90 is provided with eight damping braces 50 . Among them, one damping brace is a damping brace with a displacement meter 100 provided with a displacement meter 10 . By installing the vibration damping brace 100 with a displacement meter in at least one place among the vibration damping braces 50 installed on the bridge pier 90, the manager or the like who manages the vibration damping brace 50 can It is possible to know the amount of displacement or expansion/contraction that the has undergone, especially the maximum amount of displacement and the cumulative amount of displacement. The damping brace with displacement gauge 100 allows the administrator to determine the fatigue life from the maximum displacement amount and cumulative displacement amount measured by the displacement gauge 10 . For example, when at least one of the maximum displacement amount and the accumulated displacement amount is equal to or greater than a predetermined value, the damping brace 50 is replaced. Further, by determining the fatigue life of the vibration damping brace 100 with displacement gauge, the life of the other vibration damping braces 50 installed on the same bridge pier 90 can also be predicted. That is, the life of all the vibration damping braces 50 installed in the structure is predicted by the displacement gauge 10 of the vibration damping brace 100 installed in at least one location of the structure. Therefore, the replacement timing of the vibration damping brace 50 installed in the structure is properly performed, so that the safety and reliability of the structure can be properly maintained. If the displacement gauge 10 is installed on the vibration damping brace 50 having the largest displacement among all the vibration damping braces 50, the replacement timing of the vibration damping brace 50 can be predicted from the measured value of the displacement. This is because the damping braces 50 other than the damping brace 50 with the displacement gauge 10 have a smaller displacement amount and a longer fatigue life than the damping brace 50 with the displacement gauge 10, so the lifetime can be determined on the safe side. It is from.

Note that the number and positions of the damping braces 50 installed on the bridge pier 90 shown in FIG. 2 are an example, 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 bridge pier 90 but also to civil engineering structures such as water gates and construction structures such as buildings or towers.

(Vibration damping brace 50)
FIG. 3 is a side view of the damping brace with displacement gauge 100 according to Embodiment 1. FIG. FIG. 4 is a cross-sectional view of the damping brace 50 of FIG. FIG. 4 is a cross section taken along line AA of FIG. A damping brace with a displacement meter 100 is configured by attaching a displacement meter 10 to a damping brace 50 . The structure of the vibration damping brace 50 other than the structure for mounting the displacement gauge 10 of the vibration damping brace 100 with a displacement gauge is the same as the other vibration damping brace 50 shown in FIG.

As shown in FIG. 4 , the damping brace 50 has a cylindrical axial force member 51 and a cylindrical stiffening member 52 covering the outer circumference of the axial force member 51 . A 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 force member 51 . The central axis of the stiffener 52 is also arranged concentrically so as to be at the same position as the central axis L. That is, the axial force member 51 extends through the center of the interior of the cylindrical stiffener 52 in the longitudinal direction. The axial force member 51 is surrounded by a stiffener 52 to restrict deformation. One end 51a of the axial force member 51 in the longitudinal direction is joined to the fixed mouthpiece 54a. A fixed side end portion 52a, which is one end portion in the longitudinal direction of the stiffening member 52, is connected to a first mounting member 53a that is joined to the axial force member 51 by the fixing member 41 and the connecting plate 40. . Thereby, the fixed-side end portion 52a of the stiffener 52 is fixed so as not to be displaced relative to the first mounting member 53a.

The other longitudinal end 51b of the axial force member 51 is joined to the sliding mouthpiece 54b. A sliding side end portion 52b, which is a longitudinal end portion of the stiffening member 52, is configured to be displaceable relative to the axial force member 51 and the sliding side mouthpiece 54b. A predetermined gap is formed between the inner surface of the stiffening member 52, the outer peripheral surface of the axial force member 51, and the outer peripheral surface of the sliding side mouthpiece 54b, and the load due to the deformation of the pier 90 is applied to the damping brace 50. The stiffening member 52 is configured so that the load in the central axis L direction is not applied even if the axial force member 51 expands and contracts when it is applied.

The fixed side mouthpiece 54a and the sliding side mouthpiece 54b are joined to a mounting member 53 projecting in the opposite direction to the side to which the axial force member 51 is joined. The mounting member 53 that is joined to the fixed side mouthpiece 54a may be called a first mounting member 53a, and the side that is joined to the sliding side mouthpiece 54b may be called 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 the bridge pier 90 .

(Axial force material)
The axial force member 51 is an elongated steel member having a cylindrical cross section. In Embodiment 1, the axial force member 51, which is an elongated member made of steel and has a cylindrical cross section, is shown. 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 mouthpiece 54a is joined to one end portion 51a of the axial force member 51 in the longitudinal direction. A sliding side mouthpiece 54b is joined to the other end 51b of the axial force member 51 in the longitudinal direction.

The axial force member 51 is made of a plastically deformable material, and absorbs the energy input to the vibration damping brace 50 when the axial force member 51 plastically deforms, thereby obtaining a higher seismic resistance and effect as a vibration damper. .

(Stiffener 52)
The stiffening member 52 is, for example, a steel pipe having a cylindrical cross section, and has a structure in which the axial force 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 having a rectangular cross section may be used as long as the deflection can be restrained so that the axial force member 51 does not buckle when the axial force member 51 is deflected by the axial force. It is desirable that the longitudinal dimension of the stiffener 52 is longer than the longitudinal dimension of the axial force member 51 . Further, mortar or the like may be filled between the axial force member 51 and the stiffening member 52 for stiffening. Furthermore, a stiffening member 52 may be formed by joining a plurality of square steel pipes to restrain the deflection of the axial force member 51 . The structure of the stiffening member 52 can be appropriately changed according to the shape of the axial force member 51 and the mode of deflection.

FIG. 5 is a cross-sectional view of the stationary end 52a of the stiffener 52 of the damping brace 50 of FIG. FIG. 6 is a cross-sectional view of the first mounting 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 a bolt 42 and a nut 43 with the connecting plate 40 and the fixed-side end portion 52a of the stiffening member 52 sandwiched therebetween. A fixed side end portion 52a of the stiffening member 52 is tightened by two fixing members 41, and the fixing member 41 is fixed to the stiffening member 52 so as not to be displaced in the central axis L direction. One end of the connecting plate 40 is fixed to the fixing member 41 so as not to be displaced in the direction of the central axis L, and the other end is fixed to the first mounting member 53 a via the splicing plate 60 . As a result, the fixed side end 52a of the stiffener 52 is fixed to the first mounting member 53a so as not to be displaced in the central axis L direction.

The sliding side end portion 52b, which is the other end portion in the longitudinal direction of the stiffening member 52, has a gap in the radial direction with respect to the axial force member 51 and the sliding side mouthpiece 54b. It is configured to be displaceable relative to the side mouthpiece 54b. Therefore, even if the axial member 51 expands and contracts when a load due to the deformation of the pier 90 is applied to the damping brace 50, the stiffening member 52 is configured so that the load in the central axis L direction is not applied. That is, in the vibration damping brace 50 of Embodiment 1, no axial force (force acting in the central axis L direction of the vibration damping brace 50) is input to the stiffener 52. FIG. Since no axial force is input to the stiffening member 52, the stiffening member 52 has a plate thickness and outer diameter that can restrain the buckling of the axial force member 51 compared to the case where an axial force acts. It can be thinner and have a smaller outer diameter. As a result, the stiffening member 52 does not need to be enlarged, and the cost and weight of the damping brace 50 can be suppressed.

(Displacement meter 10)
FIG. 3(a) shows a normal state in which no load is applied to the damping brace 50 in the central axis L direction. FIG. 3B shows a state in which a load extending in the central axis L direction is applied to the damping brace 50 . FIG. 3(c) shows a state in which a load that compresses the vibration damping brace 50 in the central axis L direction is applied. As described above, the damping brace 50 is configured so that the stiffening member 52 is not deformed without being subjected to an axial force, whereas the axial force member 51 can be expanded and contracted by receiving the axial force. Therefore, the sliding side end portion 52b of the stiffening member 52 is relatively displaced in the central axis L direction with respect to the second mounting member 53b to which the axial force member 51 is joined. That is, when the axial force member 51 is deformed so as to extend by a distance δ as shown in FIG. is displaced as follows. Further, when the axial force member 51 is deformed so as to shrink by a distance δ as shown in FIG. is displaced to

The displacement meter 10 is attached to the damping brace 50 so as 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 cross-sectional view of the fixing member 21 fixed to the sliding-side end portion 52b of the stiffener 52 of the damping brace 50 according to Embodiment 1. As shown in FIG. FIG. 8 is a cross-sectional view of the second mounting member 53b and the displacement gauge 10 of the damping brace 50 according to the first embodiment. The displacement gauge 10 includes a linear motion transmission section 11, a rotary motion transmission section 8 (see FIG. 9), a one-way rotation conversion section 9 (see FIG. 9), and a body section 13 having a cumulative displacement amount display section 12 therein. , provided. The linear motion transmitting portion 11 linearly moves in the central axis L direction with respect to the main body portion 13 . Then, the rotary motion transmitting portion 8 and the unidirectional rotation converting portion 9 incorporated in the body portion 13 convert the linear motion of the linear motion transmitting portion 11 into unidirectional rotation. The cumulative displacement amount display unit 12 displays the cumulative displacement of the linear motion transmission unit 11 by moving the pointer 32 (see FIG. 9) around the display rotating shaft 31 (see FIG. 9) by one-way rotation.

In other words, the displacement gauge 10 displays the cumulative value of the relative displacement between the linear motion transmission 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 portion 11 and the main body portion 13 of the displacement meter 10 needs to match the amount of expansion and contraction of the axial force member 51. be. Therefore, the body portion 13 of the displacement meter 10 is fixed to the second mounting member 53b, and the linear motion transmission portion 11 is fixed to the sliding side end portion 52b of the stiffener 52. As shown in FIG. As a result, 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 body portion 13 of the displacement meter 10. FIG. The displacement meter 10 can display the cumulative amount of expansion and contraction of the axial force member 51 .

As shown in FIG. 7, the linear motion transmission part 11 is fixed to the sliding side end 52b of the stiffener 52. As shown in FIG. The sliding-side end 52b of the stiffener 52 is surrounded by a fixing member 21 composed of two members. The two members of the fixed member 21 sandwich the stiffener 52 and are fixed to the sliding side end portion 52b of the stiffener 52 by fastening and fixing each other with the bolt 42 and the nut 43 . The linear motion transmission part 11 is fixed to the fixed member 21 so as not to be relatively displaced in the central axis L direction. That is, the linear motion transmitting portion 11 linearly moves in the central axis L direction together with the sliding side end portion 52 b of the stiffener 52 .

As shown in FIG. 8A, the main body 13 has a displacement meter fixing plate 16 that protrudes from the housing. The displacement gauge fixing plate 16 is sandwiched between the two displacement gauge fixing splicing plates 20 in the plate surface direction, and is connected and fixed to the second mounting member 53b. In other words, the displacement gauge fixing splicing plate 20 sandwiches both the displacement gauge fixing plate 16 and the second mounting member 53b, and the bolts 42 and nuts 43 are tightened, whereby the displacement gauge fixing plate 16 and the second mounting member 53b are fastened. 2 is integrated with the mounting member 53b. Further, as shown in FIG. 3, the displacement gauge fixing splicing plate 20 connects the second mounting member 53b and the mounting portion 95 formed on the structure. In other words, the displacement gauge fixing splice plate 20 also has the function of the splice plate 60 .

8B and 8C are cross-sectional views showing modifications of the structure of the joint between the displacement gauge fixing plate 16 and the second mounting member 53b. As shown in FIG. 8B, the displacement gauge fixing splice plate 20 is used only on one side of the displacement gauge fixing plate 16, and one displacement gauge 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. That is, the displacement gauge fixing plate 16 and one displacement gauge fixing splicing plate 20 are connected and fixed, and the one splicing plate 60 and the displacement gauge fixing splicing plate 20 are connected and fixed to the second mounting member 53b. , connect the displacement gauge fixing plate 16 and the second mounting member 53b. At this time, one displacement gauge fixing splicing plate 20 and one splicing plate 60 have the function of connecting the second mounting member 53 b and the mounting portion 95 of the bridge pier 90 . According to this configuration, the displacement gauge 10 can be installed or removed from the damping brace 50 while the displacement gauge fixing splice plate 20 is fixed to the second mounting member 53b.

As shown in FIG. 8(c), the displacement gauge 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 the bolts 42 and the nuts 43. As shown in FIG. With this configuration, the number of parts in the joint portion between the displacement meter fixing plate 16 and the second mounting member 53b can be reduced, and the work of mounting the displacement meter 10 can be facilitated. At this time, the displacement gauge fixing plate 16 has the functions of the displacement gauge fixing splicing plate 20 and the splicing 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 bridge pier 90. As shown in FIG. The displacement gauge fixing plate 16 fixes the second mounting member 53b to the mounting portion 95 together with the splicing plate 60 facing each other across the second mounting member 53b.

(Cumulative displacement measurement by displacement meter 10)
FIG. 9 is an explanatory diagram showing an example of the internal structure of the displacement gauge 10 according to the first embodiment. As shown in FIG. 3, the relative displacement between the stiffening member 52 and the second mounting member 53b is caused by the axial expansion and contraction displacement of the axial force member 51. As shown in FIG. The axial expansion/contraction displacement of the axial force member 51 is caused by compressive and tensile axial loads acting in the axial direction of the damping brace 50 .

FIG. 9(a) shows the operation of the accumulated displacement amount display unit 12 when the axial force member 51 is displaced in the tension direction, and FIG. The operation of the displacement amount display unit 12 is shown. In FIGS. 9A and 9B, R1 indicates clockwise rotation from the point of view of arrow R, and R2 indicates counterclockwise rotation.

When the axial force member 51 is displaced in the pulling direction, as shown in FIG. Rotation in the R1 direction is transmitted to the worm gear 71 via the worm 81 .

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

Then, the rotation in the R1 direction transmitted to the synthetic 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 unit 12 is moved in the direction in which the axial force member 51 is pulled. It rotates clockwise by a predetermined angle as the cumulative amount of displacement when it is displaced.

Further, when the axial force member 51 is displaced in the compression direction, as shown in FIG. Rotation is transmitted through the worm 81 to the worm gear 71 as rotation in the R2 direction.

The rotation in the R2 direction transmitted to the worm gear 71 is transmitted to the third branch gear 80 via the second one-way clutch 78 and the second clutch gear 79 as rotation in the R1 direction. The rotation in the R1 direction transmitted to the third branch gear 80 is transmitted to the compound 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 synthetic gear 76 is transmitted to the display rotation shaft 31 via the output shaft 77, so that the indicator 32 of the accumulated displacement amount display unit 12 moves in the compression direction of the axial force member 51. 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 transmission portion 11 constituted by a rack is called a rotary motion transmission portion 8 . 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 called a one-way rotation converting portion 9 . The unidirectional rotation conversion section 9 converts the rotational motion of the rotary motion transmission section 8 rotating in both forward and reverse directions into unidirectional rotation.

By providing 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 force member 51 and display it on the cumulative displacement amount display section 12 .

(Maximum displacement measurement by displacement meter 10)
The displacement gauge 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 stiffener 52 side side surface of the linear motion transmission portion 11 passing through the body portion 13 and the rack teeth. The compression-side displacement display member 14 is a gate-shaped or ring-shaped member that stops on the linear motion transmission portion 11 when not in contact with the body portion 13 . When the axial force member 51 is displaced in the compression direction, the compression side displacement display member 14 contacts a part of the side surface of the main body 13 facing the stiffener 52 side, as shown in FIG. 3(c). While being in contact with each other, it slides on the linear motion transmission section 11 toward the end.

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

Even if the compression side displacement display member 14 and the tension side displacement display member 15 return to the normal state shown in FIG. 3(a) after going through the states shown in FIGS. The position on the part 11 remains unchanged. Therefore, the movement 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 force member 51 is shown. In other words, the displacement gauge 10 has a maximum displacement display section that displays the maximum value of relative displacement by the compression-side displacement display member 14 and the tension-side displacement display member 15 .

(Effect of damping brace 100 with displacement gauge)
As described above, the damping brace with displacement gauge 100 according to Embodiment 1 includes the axial force member 51, the stiffening member 52 in which the axial force member 51 is inserted, and the axial force member 51. a first mounting member 53a and a second mounting member 53b respectively joined to both ends of the stiffener 52; A fixed-side end portion 52a of the stiffener 52 is fixed so as not to be displaced relative to the first mounting member 53a.
The stiffening member 52 is a steel pipe, and a connecting plate 40 connects and fixes the fixed side end portion 52a of the stiffening member 52 and the first mounting member 53a.
With this configuration, the stiffener 52 is fixed to the first mounting member 53a at one end of the damping brace 50 so as not to move relative to it. Therefore, by measuring the relative displacement between the second mounting member 53b at the other end of the damping brace 50 and the stiffener 52, the expansion and contraction of the axial force member 51 can be measured with high accuracy.

The displacement gauge 10 also includes a linear motion transmission section 11 , a rotary motion transmission section 8 , a one-way rotation conversion section 9 , and an accumulated displacement amount display section 12 . The linear motion transmission portion 11 linearly moves in the axial direction of the axial force member 51 according to the relative displacement between the sliding side end portion 52b of the stiffening member 52 and the second mounting member 53b. , the linear motion of the linear motion transmission section 11 is converted into rotary motion, and the one-way rotation conversion section 9 is composed of a plurality of rotary elements, and converts the forward and reverse rotation transmitted from the rotary motion transmission section 8 into one-way rotation. Convert to The cumulative displacement amount display unit 12 uses the one-way rotation transmitted from the one-way rotation conversion unit 9 to display the cumulative relative displacement as the cumulative displacement amount.
Further, the displacement gauge 10 includes a body portion 13 having a rotary motion transmission portion 8, a one-way rotation conversion portion 9, and an accumulated displacement amount display portion 12, and is fixed to the second mounting member 53b. The linear motion transmission portion 11 is connected to the sliding side end portion 52b of the stiffener 52 by the fixing member 21 .
With the above configuration, the displacement gauge 10 is fixed to the second mounting member 53b connected to the mounting portion 95 of the structure such as the bridge pier 90. As shown in FIG. Therefore, the displacement meter 10 is installed in a relatively stable portion even when the bridge pier 90 vibrates, and damage and erroneous measurement due to vibration can be suppressed. In particular, the stiffening member 52 is only joined at one longitudinal end, and the sliding end 52b is susceptible to vibration.

In Embodiment 1, the displacement gauge 10 is attached to the vibration damping brace 50 by fixing the displacement gauge fixing plate 16 to the second mounting member 53b. However, the displacement meter 10 can be installed on the damping brace 50 . Therefore, it is possible to manufacture, procure, and install the damping brace 50 prior to determining the specifications of the displacement gauge 10 . Therefore, the construction period for installing the damping brace 100 with displacement gauge can be shortened. Also, after installing a plurality of damping braces 50 on a structure such as a bridge pier 90, it is possible to determine which damping brace 50 to attach the displacement gauge 10 to. Furthermore, by fixing the second mounting member 53b and the displacement gauge fixing plate 16 by bolting, there is an advantage that inspection, repair, and replacement of the displacement gauge 10 are facilitated. The second mounting member 53b of the damping brace 50 is fixed to a mounting portion 95 such as a gusset plate of the bridge pier 90 using a splicing plate 60. Only by changing to the contact plate 20, it can be installed on the second mounting member 53b.

Also, as shown in FIG. 2, by installing the vibration damping brace 100 with a displacement meter on the structure so that the side on which the displacement meter 10 is installed is positioned downward, the vibration damping brace 50 can be inspected and There is an advantage that the operator can easily check the displacement gauge 10 even during replacement. In addition, since the damping brace 50 has the displacement gauge 10 side facing downward, the sliding side end 52b of the stiffening member 52 that is open faces downward, so that rainwater does not reach the stiffening member 52. It is difficult to infiltrate and can prevent retention. Corrosion of each member constituting the damping brace 50 can thereby be suppressed.

(Modification of damping brace 100 with displacement gauge)
FIG. 10 is a side view showing a modification of the damping brace with displacement gauge 100 according to the first embodiment. A damping brace with a displacement meter 100a according to a modification is obtained by installing a displacement meter 10 on a damping brace 50a. The vibration damping brace 50a has the same mounting structure as the sliding side end 52b of the stiffener 52 and the displacement gauge 10, but the fixed side end 52a of the stiffener 52 is fixed. It differs in that it is fixed to the side mouthpiece 54a by joining means such as welding 44. FIG.

FIG. 11 is a side view showing a modification of the damping brace with displacement gauge 100 according to the first embodiment. A damping brace with a displacement meter 100b according to a modification is obtained by installing a displacement meter 10 on a damping brace 50b. The damping brace 50b has the same attachment structure as the sliding side end 52b of the stiffener 52 and the displacement gauge 10, but the fixed side end 52a of the stiffener 52 is the end. It differs in that it is joined to the first mounting member 53a via the connecting member 45. FIG. The end connecting member 45 is joined to the opening of the fixed side end 52a of the cylindrical stiffening member 52 by means of welding or the like. A first mounting member 53 a is fixed to the end connecting member 45 by a joining means such as welding 44 .

As shown in FIGS. 10 and 11, the damping brace 100 with displacement gauge according to the first embodiment can fix the stiffening member 52 not by the connecting plate 40 but by 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, 14, 15, and 16 are cross-sectional views of the damping brace with displacement gauge 100c of FIG. 13 shows cross sections of the PP part of FIG. 12, FIG. 14 shows the QQ part of FIG. 12, FIG. 15 shows the RR part of FIG. 12, and FIG. 16 shows the SS part of FIG. there is A damping brace with a displacement meter 100c according to a modification is obtained by installing a displacement meter 10 on a damping brace 50c. Unlike the damping braces 50, 50a, and 50b, the damping brace 50c is made of a plate-like member. As shown in FIG. 13, the axial force member 151 of the vibration damping brace 50c is made of a plate-shaped steel material, and is sandwiched between two stiffeners 152 from the surface direction of the plate, resulting in buckling deformation due to expansion and contraction. is suppressed. The stiffening member 152 is a member having a T-shaped cross section, and has high rigidity in a surface direction facing the surface of the axial force member 151 . Two spacers 57 are sandwiched in parallel with the axial force member 151 between two stiffeners 152 arranged symmetrically with the axial force member 151 interposed therebetween. The two stiffeners 152 and the spacer 57 are fastened and fixed by bolts 42 and nuts 43 . The axial force member 151 is surrounded by the stiffener 152 and the spacer 57, is arranged with a gap, and is arranged so as to be able to expand and contract in the central axis L direction.

As shown in FIG. 14, the fixed side end portion 152a of the stiffener 152 is fixed by a bolt 42 and a nut 43 to a first mounting member 53a integrally formed with the axial force member 151. As shown in FIG. A fixed-side end portion 152a of the stiffener 152 is fixed to the first mounting member 53a so as not to be relatively displaced in 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 slide pin 56 protrudes in the plane direction. The slide pin 56 is inserted through an elongated hole 55 provided in the stiffener 52 and is configured to be movable in the central axis L direction. That is, the second mounting member 53b is configured to be movable in the central axis L direction with respect to the sliding side end portion 52b of the stiffener 52. As shown in FIG. That is, even if the axial force member 151 receives a load in the central axis L direction and expands and contracts, the load is not transmitted to the stiffening member 52 .

As shown in FIG. 16 , the sliding side end portions 152 b of the stiffeners 152 sandwich the fixing member 21 between the stiffeners 152 and fix them with bolts 42 and nuts 43 . The linear motion transmission section 11 is fixed to the fixed member 21 . Since the displacement gauge 10 is fixed to the second mounting member 53b in the same manner as the vibration damping brace 100 with a displacement gauge according to the first embodiment, the expansion and contraction of the axial force member 151 causes the displacement gauge 10 to move in a straight line with the body portion 13 of the displacement gauge 10. The motion transmitting portion 11 is relatively displaced. Thereby, the displacement gauge 10 can measure the accumulated displacement due to the expansion and contraction of the axial force member 151 .

According to the vibration damping brace with displacement gauge 100c according to the modification, the axial force member 151 and the stiffener 152 are formed of plate-like members, and the fixed side end 152a of the stiffener 152 and the first mounting member 53a is fixed by the bolt 42, and the sliding side end portion 152b of the stiffening member 152 and the axial force member 151 are configured to be slidable. Even with such a configuration, the same effect as in the first embodiment can be obtained.

Embodiment 2.
Embodiment 2 is different from the vibration damping brace with displacement meter 100 according to Embodiment 1 in that the fixed member 21 attached to the linear motion transmission portion 11 of the displacement meter 10 and the sliding side end portion 52b of the stiffener 52 is It is a modification of the connection structure with In the second embodiment, changes from the first embodiment will be mainly described.

FIG. 17 is a side view of the damping brace with displacement gauge 200 according to the second embodiment. FIG. 18 is a cross-sectional view of the damping brace 200 with displacement gauge of FIG. FIG. 18 is a cross section taken along line GG of FIG. A fixed member 221 attached to the sliding side end portion 52b of the stiffener 52 of the damping brace 50 according to Embodiment 2 is formed with an elongated hole 222 having a major diameter in a direction perpendicular to the central axis L. . A linear motion transmission part 211 provided in the displacement meter 10 is provided with a motion transmission pin 223 at its end, and is configured to be movable in the elongated hole 222 in the direction perpendicular to the central axis L. As shown in FIG. Further, the motion transmission pin 223 and the long hole 222 are formed with a small gap in the central axis L direction. Therefore, when the sliding-side end 52b of the stiffener 52 and the first mounting member 53a are displaced relative to each other due to the expansion and contraction of the axial force member 51, the motion transmission pin 223 and the long hole 222 come into contact with each other. The linear motion transmission part 211 is configured to move by

FIG. 19 is a cross-sectional view when the damping brace with displacement gauge 200 according to Embodiment 2 receives vibration and the stiffener 52 is displaced. FIG. 19 is a cross section taken along line GG of FIG. The damping brace 50 has a gap between the stiffener 52 and the axial force member 51 . As shown in FIG. 17, the stiffener 52 is fixed to the first mounting member 53a at the fixed side end 52a, but the sliding side end 52b is the free end of the cantilever beam. Therefore, the sliding-side end portion 52b of the stiffening member 52 is likely to be displaced in the direction perpendicular to the central axis L of the axial force member 51 due to the vibration of the pier 90 . Therefore, between the linear motion transmitting portion 211 of the displacement gauge 10 fixed to the second mounting member 53b and the fixed member 221 fixed to the sliding side end portion 52b, there is a displacement in the direction perpendicular to the central axis L. occurs.

When the fixed member 221 and the linear motion transmission portion 211 are fixed so as not to be displaced relative to each other, the relative displacement between the sliding side end portion 52b of the stiffener 52 and the second mounting member 53b causes the linear motion transmission portion 211 to move. Alternatively, a load may be applied to the internal structure of the displacement meter 10, which may result in damage to parts, erroneous measurement of displacement, or the like. For example, if the linear motion transmission part 211 is configured by a rack member, the rack member may be bent in a direction perpendicular to the central axis L, and the rack member may be damaged, or the rack may become damaged inside the main body 13 of the displacement meter 10 . Damage and malfunction of the meshing portion with the pinion 70 are caused. However, according to the damping brace with displacement gauge 200 according to Embodiment 2, since the fixed member 221 and the linear motion transmission part 211 are structured to be relatively displaceable in the direction perpendicular to the central axis L, the bridge pier Accumulated displacement and maximum displacement of the damping brace 50 can be accurately measured without being affected by vibrations of structures such as 90, and damage to the displacement gauge 10 can be suppressed.

8 rotary motion transmission unit 9 unidirectional rotation conversion unit 10 displacement meter 11 linear motion transmission unit 12 cumulative displacement amount display unit 13 body unit 14 compression side displacement display member 15 tension side displacement display member 16 displacement gauge fixing plate 17a side surface 17b side surface 20 displacement gauge fixing splicing plate 21 fixing member 31 display rotating shaft 32 pointer 40 connecting plate 41 fixing member 42 bolt 43 nut 45 end connecting member 50 damping brace, 50a damping brace, 50b damping brace, 50c damping brace, 51 axial force member, 51a end, 51b other end, 52 stiffener, 52a fixed side end, 52b sliding side End 53 Mounting member 53a First mounting member 53b Second mounting member 54a Fixed side mouthpiece 54b Sliding side mouthpiece 55 Long hole 56 Slide pin 57 Spacer 60 Splice 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 second 3-branch gear, 81 worm, 90 pier, 91 bridge, 92 foundation, 93 ground, 94 beam, 95 mounting portion, 96 column, 100 vibration damping brace with displacement gauge, 100a vibration damping brace with displacement gauge, 100b system with displacement gauge Swing brace 100c Damping brace with displacement gauge 151 Axial force member 152 Stiffening member 152a Fixed side end 152b Sliding side end 200 Damping brace with displacement gauge 211 Linear motion transmission part 221 Fixed Member, 222 slot, 223 motion transmission pin, L central axis, R arrow, V arrow, W arrow, δ distance.

Claims (15)

axial force material;
a stiffening member into which the axial force member is inserted;
a first mounting member and a second mounting member joined to both axial ends of the axial force member;
a displacement meter;
The displacement meter is
It is installed between the sliding side end, which is one end of the stiffener, and the second mounting member, and controls the relative displacement between the one end of the stiffener and the second mounting member. measure and
The fixed side end, which is the other end of the stiffener,
fixed to the first mounting member ;
The stiffener is a steel pipe,
Between the fixed side end of the stiffener and the first mounting member,
A damping brace that is connected and fixed by a connecting plate . axial force material;
a stiffening member into which the axial force member is inserted;
a first mounting member and a second mounting member joined to both axial ends of the axial force member;
a displacement meter;
The displacement meter is
It is installed between the sliding side end, which is one end of the stiffener, and the second mounting member, and controls the relative displacement between the one end of the stiffener and the second mounting member. measure and
The fixed side end, which is the other end of the stiffener,
fixed to the first mounting member ;
The axial force member and the stiffener are
Consists of a plate-like member,
The fixed side end of the stiffener and the first mounting member are
fixed by bolts
The sliding side end of the stiffener and the axial force member are
A damping brace that is slidably configured . axial force material;
a stiffening member into which the axial force member is inserted;
a first mounting member and a second mounting member joined to both axial ends of the axial force member;
a displacement meter;
The displacement meter is
It is installed between the sliding side end, which is one end of the stiffener, and the second mounting member, and controls the relative displacement between the one end of the stiffener and the second mounting member. measure and
The first mounting member is
It is joined to the stiffener via the fixed side mouthpiece,
The stiffener is a steel pipe,
The fixed side end, which is the other end of the stiffener,
A damping brace that is welded to the fixed-side mouthpiece and fixed to the first mounting member via the fixed-side mouthpiece . The displacement meter is
a linear motion transmission unit, a rotary motion transmission unit, a one-way rotation conversion unit, and a cumulative displacement amount display unit;
The linear motion transmission part is
linearly moving in the axial direction of the axial force member according to the relative displacement between the one end of the stiffener and the second mounting member;
The rotational motion transmission part is
converting the linear motion of the linear motion transmission unit into rotary motion;
The one-way rotation conversion unit is
It is composed of a plurality of rotating elements, and converts forward and reverse rotation transmitted from the rotational motion transmission unit into unidirectional rotation,
The cumulative displacement amount display unit
The damping brace according to any one of claims 1 to 3, wherein the unidirectional rotation transmitted from the unidirectional rotation converter is used to display the cumulative relative displacement as an accumulated displacement amount. The displacement meter is
a main body portion having the rotational motion transmission portion, the one-way rotation conversion portion, and the cumulative displacement amount display portion;
The main body is
fixed to the second mounting member;
The linear motion transmission part is
5. The vibration damping brace according to claim 4, wherein the stiffener is connected to the sliding end of the stiffener by a fixing member. axial force material;
a stiffening member into which the axial force member is inserted;
a first mounting member and a second mounting member joined to both axial ends of the axial force member;
a displacement meter;
The displacement meter is
a linear motion transmission part that linearly moves in the axial direction of the axial force member according to the relative displacement between the one end of the stiffening member and the second mounting member;
a rotary motion transmission unit that converts the linear motion of the linear motion transmission unit into rotary motion;
a unidirectional rotation conversion unit configured by a plurality of rotating elements and configured to convert forward and reverse rotation transmitted from the rotary motion transmission unit into unidirectional rotation;
a cumulative displacement amount display unit for displaying the cumulative relative displacement as a cumulative displacement amount using the unidirectional rotation transmitted from the unidirectional rotation converting unit;
a main body portion having the rotational motion transmission portion, the one-way rotation conversion portion, and the cumulative displacement amount display portion;
It is installed between the sliding side end, which is one end of the stiffener, and the second mounting member, and the relative displacement between the one end of the stiffener and the second mounting member. to measure
The fixed side end, which is the other end of the stiffener,
fixed to the first mounting member ;
The main body is
fixed to the second mounting member;
The linear motion transmission part is
A damping brace connected to the sliding end of the stiffener by a fixing member . The linear motion transmission part is
movably connected to the fixed member in a direction perpendicular to the axial direction of the axial force member;
7. The damping brace according to claim 5 or 6 , wherein the axial force member is connected to be displaceable along with the fixing member in the axial direction. The fixing member is
A long hole having a major diameter in a direction perpendicular to the axial direction of the axial force member,
The linear motion transmission part is
8. A damping brace according to claim 7 , comprising a motion transmission pin inserted through said slot. The main body of the displacement meter is
A displacement gauge fixing plate protruding from the main body,
The displacement meter fixing plate is
The damping brace according to any one of claims 5 to 8 , fixed to the second mounting member. The displacement meter fixing plate is
10. The damping brace according to claim 9 , fixed to said second mounting member via a displacement gauge fixing splice plate. The displacement meter is
The damping brace according to any one of claims 4 to 10 , further comprising a maximum displacement display section for displaying the maximum value of said 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 11 are connected to mounting portions of a frame. The displacement meter fixing plate is
13. The structure according to claim 12 , which is formed integrally with a splicing plate that joins the second mounting member and the mounting portion. The displacement gauge fixing splice plate is
13. The structure according to claim 12 , which is formed integrally with a splicing plate that joins the second mounting member and the mounting portion. The damping brace is
15. The structure according to any one of claims 12 to 14 , wherein said second mounting member having said displacement gauge is positioned downward.

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