JP5520665B2 - Dynamic vibration absorber mounting structure - Google Patents

Description

  The present invention relates to a dynamic vibration absorber mounting structure for mounting a dynamic vibration absorber to a structure to reduce the vibration of the structure.

  Conventionally, it is known to fix a dynamic vibration absorber on a bridge as a technique for reducing vibration of a structure such as a bridge. In this method, in order to reliably transmit vibration from the bridge to the dynamic vibration absorber, drilling is performed on the bridge housing, and the dynamic vibration absorber and the bridge are firmly fixed by bolting or the like. (For example, refer to Patent Document 1).

JP 2001-065079 A

  However, according to the conventional method, since it is necessary to perform large-scale processing such as drilling on the bridge, there is a problem that the load bearing capacity of the bridge may be reduced depending on the processing.

  Therefore, an object of the present invention is to provide an attachment structure for a dynamic vibration absorber that attaches a dynamic vibration absorber to a bridge structure while reducing processing on the structure.

The dynamic vibration absorber mounting structure according to the present invention includes a dynamic vibration absorber attached to a structure having a pair of girders whose upper flange portions are connected to each other and extending downward to reduce the vibration of the structure. The structure is an I-type girder having a lower flange portion, which is disposed between opposing spar and has an attachment member fixed to the girder by an axial force caused by lateral stretching. Is formed with an inclined surface inclined obliquely downward toward the opposite I-shaped girder, and the mounting member is stretched and fixed between the inclined surfaces of the opposed I-shaped beam , Is fixed to the mounting member.

  According to the present invention, the mounting member disposed between the pair of opposed girders is fixed in such a manner that it is stretched laterally between the opposed girders and is sandwiched between the opposed girders by an axial force. And since a dynamic vibration absorber is fixed to a structure by fixing to this attachment member, it becomes possible to reduce the process with respect to a structure and to fix a dynamic vibration absorber to a structure.

Since the inclined surfaces of the opposing I-shaped girders face each other and face obliquely upward, the attachment member that is stretched and fixed to the inclined surface is prevented from moving downward. For this reason, even if a heavy dynamic vibration absorber is fixed to the attachment member, the attachment member can maintain the fixation with the I-shaped girder without shifting or dropping downward, and the dynamic vibration absorber can be more reliably secured. It can be fixed to the structure.

  Moreover, it is preferable to further include a restraining member that is disposed between the inclined surface and the upper flange portion and restrains the attachment member from moving upward by an axial force caused by the longitudinal stretching. According to the mounting structure of the dynamic vibration absorber, the restraining member can be stretched in the vertical direction between the inclined surface and the upper flange portion, and restrained from moving upward by the axial force. For this reason, the attachment member can more reliably maintain the fixing with the I-shaped girder without coming off between the inclined surfaces, and the dynamic vibration absorber can be more reliably fixed to the structure.

A dynamic vibration absorber mounting structure according to the present invention is a dynamic vibration absorber mounting structure in which a dynamic vibration absorber is attached to a structure having a hollow box girder to reduce vibration of the structure, and is opposed to the structure. The first mounting member that fixes the dynamic vibration absorber placed on the inner bottom surface to the box-type girder by the axial force caused by the lateral tension between the inner side surfaces, and the vertical tension between the inner upper surface and the inner bottom surface And a second mounting member for fixing the dynamic vibration absorber to the box-type girder by the axial force generated by.

  According to the present invention, the first mounting member stretches in the lateral direction inside the box-type beam and presses and fixes the dynamic vibration absorber to the box-type beam by the axial force so as to be sandwiched between the opposed inner side surfaces. For this reason, it becomes possible to reduce the process with respect to a structure and to fix a dynamic vibration absorber to a structure.

Then, the second mounting member stretches in the vertical direction between the inner upper surface and the inner bottom surface, and presses and fixes the dynamic vibration absorber to the box girder by the axial force so as to be sandwiched between the inner upper surface and the inner bottom surface. . For this reason, it can suppress that a dynamic vibration absorber floats from an inner bottom face, and it becomes possible to fix a dynamic vibration damper to an inner bottom face more reliably.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to reduce the process with respect to a structure and to attach a dynamic vibration absorber to a bridge structure.

It is a side view which shows the attachment structure of the dynamic vibration damper which concerns on 1st Embodiment. It is a side view which shows the attachment structure of the dynamic vibration damper which concerns on 2nd Embodiment. It is a figure which shows the attachment structure of the dynamic vibration absorber of a reference form , (a) is a front view of a bridge, (b) is a left view of a bridge.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the present embodiment, as an example of a structure for attaching a dynamic vibration absorber, a case where the dynamic vibration absorber is attached to a bridge in which a track on which a train runs is laid on the upper surface will be described. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a side view showing a dynamic vibration absorber mounting structure according to the first embodiment. As shown in the figure, the bridge 1 includes a pair of I-type girders 2 and 3 supported by being supported by a plurality of piers (not shown). Is laid with a track on which the train runs.

  Each I-type girder 2 and 3 includes upper flange portions 4 and 5 connected to the other I-type girder 3 and 2, and each I-type girder 2 and 3 is connected to the upper flange portions 4 and 5, respectively. The body parts 6, 7 extending downward and the lower flange parts 8, 9 formed at the lower part of the body parts 6, 7 are provided. And the trunk | drum 6 and the trunk | drum 7, and the lower flange part 8 and the lower flange part 9 are arrange | positioned so that it may each oppose.

  The lower flange portions 8 and 9 are formed with inclined surfaces 10 and 11 which are inclined obliquely downward toward the other I-shaped girders 3 and 2 and directed obliquely upward so as to face each other. The inclined surfaces 10 and 11 are in contact with triangular prism-shaped receiving members 12 and 13, respectively.

  The receiving member 12 has a first surface 12 a that contacts the inclined surface 10, and a second surface that faces the inclined surface 11 of the other I-shaped girder 3 in a state where the first surface 12 a contacts the inclined surface 10. This is a rigid member in which a surface 12b and a third surface 12c facing the upper flange portion 4 in a state where the first surface 12a is in contact with the inclined surface 10 are formed. The receiving member 13 faces the inclined surface 10 of the other I-shaped girder 2 in a state where the first surface 13 a is in contact with the inclined surface 11 and the first surface 13 a is in contact with the inclined surface 11. This is a rigid member in which a second surface 13b and a third surface 13c facing the upper flange portion 5 in a state where the first surface 13a is in contact with the inclined surface 11 are formed. An attachment member 15 for fixing the dynamic vibration absorber 14 is fixed between the inclined surfaces 10 and 11 via the receiving members 12 and 13.

  The attachment member 15 is composed of a beam provided with a giraffe jack 16 whose length can be adjusted by rotating around an axis. The length of the mounting member 15 is adjusted by the giraffe jack 16 so as to be slightly longer than the length from the second surface 12b of the receiving member 12 to the second surface 13b of the receiving member 13 in an unloaded state. One end of which is in contact with the second surface 12 b of the receiving member 12, and the other end of which is in contact with the second surface 13 b of the receiving member 13. And the attachment member 15 presses the inclined surface 10 and the inclined surface 11 via the receiving member 12 and the receiving member 13 by the axial force due to the lateral tension between the inclined surface 10 and the inclined surface 11, It is fixed to the I-type girder 2 and 3 so as to be sandwiched between the I-type girder 2 and the I-type girder 3.

  On the other hand, between the inclined surface 10 and the inclined surface 11 and the upper flange portion 4 and the upper flange portion 5, a restraining member 17 and restraint for restraining the receiving member 12 and the receiving member 13 from moving upward, respectively. The member 18 is fixed.

  The restraining member 17 is composed of a columnar object provided with a giraffe jack 19 whose length can be adjusted by rotating around the axis, and one end of the restraining member 17 is brought into contact with the third surface 12c of the receiving member 12, The other end is in contact with the upper flange portion 4. The length of the restraining member 17 is adjusted by the giraffe jack 19 so as to be slightly longer than the length from the third surface 12c of the receiving member 12 to the upper flange portion 4 in an unloaded state. The member 18 is composed of a columnar member provided with a giraffe jack 20 whose length can be adjusted by rotating around the axis, one end of which is abutted against the third surface 13c of the receiving member 13, and the like. The end is in contact with the upper flange portion 5. The length of the restraining member 18 is adjusted by the giraffe jack 20 so as to be slightly longer than the length from the third surface 13c of the receiving member 13 to the upper flange portion 5 in an unloaded state.

  Then, the restraining members 17 and 18 are acted on by an axial force due to a longitudinal tension pressing the receiving members 12 and 13 and the upper flange portions 4 and 5 between the inclined surfaces 10 and 11 and the upper flange portions 4 and 5. Thus, the receiving members 12 and 13 are pressed and fixed to the inclined surfaces 10 and 11.

  In this way, the dynamic vibration absorber 14 is firmly fixed to the upper surface of the attachment member 15 fixed to the I-shaped girder 2 by bolting or the like.

  Next, a method for attaching the dynamic vibration absorber 14 to the bridge 1 in the dynamic vibration absorber mounting structure according to the first embodiment will be described.

  First, the first surfaces 12a and 13a of the receiving members 12 and 13 are brought into contact with the inclined surfaces 10 and 11 of the pair of I-shaped girders 2 and 3, respectively. At this time, the receiving members 12 and 13 may be prevented from falling by bonding between the inclined surfaces 10 and 11 and the first surfaces 12a and 13a.

  Then, the giraffe jack 16 of the mounting member 15 is rotated so that the length of the mounting member 15 is shorter than the length from the second surface 12b of the receiving member 12 to the second surface 13b of the receiving member 13. Then, the mounting member 15 is inserted between the receiving member 12 and the receiving member 13.

  Similarly, by rotating the giraffe jacks 19 and 20 of the restraining members 17 and 18, the lengths of the restraining members 17 and 18 are changed from the third surfaces 12b and 13b of the receiving members 12 and 13 to the upper flange portions 4 and 13, respectively. The restraining members 17 and 18 are inserted between the receiving members 12 and 13 and the upper flange portions 4 and 5 so as to be shorter than the length up to 5.

  And when it is a no-load state, it is a giraffe jack until the length of the attachment member 15 becomes slightly longer than the length from the 2nd surface 12b of the receiving member 12 to the 2nd surface 13b of the receiving member 13 16 is rotated, and the attachment member 15 is fixed to the I-type girders 2 and 3 by lateral stretching between the inclined surface 10 of the I-type beam 2 and the inclined surface 11 of the I-type beam 3.

  Similarly, in a no-load state, the lengths of the restraining members 17 and 18 are slightly shorter than the lengths from the third surfaces 12b and 13b of the receiving members 12 and 13 to the upper flange portions 4 and 5, respectively. The giraffe jacks 19 and 20 are rotated until they become long, and the receiving members 12 and 13 are made to be I-shaped girders 2 and 3 by vertical stretching between the inclined surfaces 10 and 11 and the upper flange portions 4 and 5, respectively. To fix.

  Thereafter, the dynamic vibration absorber 14 is placed on the upper surface of the attachment member 15, and the dynamic vibration absorber 14 is fixed to the attachment member 15 by bolting or the like.

  As described above, according to the mounting structure of the dynamic vibration absorber according to the first embodiment, the mounting member 15 is laterally stretched between the pair of I-shaped girders 2 and 3, and the pair of I-shaped girders 2 by the axial force. , 3 are pressed and fixed so as to be sandwiched between them. Then, by fixing the dynamic vibration absorber 14 to the attachment member 15, the dynamic vibration absorber 14 is fixed to the bridge 1, so that processing on the bridge 1 can be reduced and the dynamic vibration absorber 14 can be fixed to the bridge 1. It becomes possible.

  Moreover, according to the attachment structure of the dynamic vibration absorber according to the first embodiment, the inclined surfaces 10 and 11 of the pair of I-shaped girders 2 and 3 face each other and face obliquely upward. The attachment member 15 that is stretched and fixed to 11 is prevented from moving downward. For this reason, even if the heavy dynamic vibration absorber 14 is placed and fixed on the attachment member 15, the attachment member 15 can maintain the fixation with the I-shaped girders 2 and 3 without being displaced downward or dropping. The dynamic vibration absorber 14 can be reliably fixed by the bridge 1.

  Moreover, according to the attachment structure of the dynamic vibration absorber according to the first embodiment, the restraining members 17 and 18 are stretched in the vertical direction between the inclined surfaces 10 and 11 and the upper flange portions 4 and 5, and are caused by the axial force. It is possible to restrain the receiving members 12 and 13 from moving upward. For this reason, the attachment member 15 can more reliably maintain the fixing with the I-shaped girder 2 without coming off between the inclined surfaces 10 and 11, and the dynamic vibration absorber 14 can be reliably fixed by the bridge 1. It becomes possible.

  Next, a second embodiment according to the present invention will be described. FIG. 2 is a side view showing a dynamic vibration absorber mounting structure according to the second embodiment. As shown in the figure, the bridge 21 includes a box girder 22 that is supported by being supported by a plurality of piers (not shown). On the upper surface of the box girder 22, a track on which a train travels is provided. It is laid.

  The box girder 22 is formed in a cylindrical hollow structure. The hollow interior includes an inner bottom surface 23 that is a substantially horizontal surface and a pair of inner sides that extend upward from both ends of the inner bottom surface 23 in the lateral direction. The side surfaces 24 and 25 and the inner upper surface 26 that is connected to the upper ends of the pair of inner side surfaces 24 and 25 and is substantially parallel to the inner bottom surface 23 are surrounded.

  Two dynamic vibration absorbers 27 and 28 are placed side by side in the short direction on the inner bottom surface 23 of the box girder 22. The dynamic vibration absorber 27 is located closer to the inner side surface 24 than the dynamic vibration absorber 28, and the dynamic vibration absorber 28 is located between the dynamic vibration absorber 27 and the inner side surface 25.

  A non-stretchable support beam 29 is disposed between the dynamic vibration absorber 27 and the inner side surface 24, and a non-stretchable support beam 32 is disposed between the dynamic vibration absorber 27 and the dynamic vibration absorber 28. ing.

  An attachment member 33 is disposed between the dynamic vibration absorber 28 and the inner side surface 25. The attachment member 33 is composed of a beam provided with a giraffe jack 34 whose length can be adjusted by rotating around the axis. The length of the mounting member 33 is adjusted by the giraffe jack 34 so as to be slightly longer than the length from the side surface on the inner side surface 25 side to the inner side surface 25 of the dynamic vibration absorber 28 in the no-load state. One end is in contact with the side surface on the inner side surface 25 side of the dynamic vibration absorber 28, and the other end is in contact with the inner side surface 25. The mounting member 33 causes the dynamic vibration absorber 28 and the dynamic vibration absorber 27 to be connected to the inner bottom surface 23 side via the support beams 29 and 32 by an axial force caused by a lateral tension between the inner side surface 24 and the inner side surface 25. The dynamic vibration absorber 27 and the dynamic vibration absorber 28 are fixed to the box girder 22 so as to be sandwiched between the inner side surface 24 and the inner side surface 25.

  An attachment member 30 is disposed between the dynamic vibration absorber 27 and the inner upper surface 26. This attachment member 30 is comprised by the columnar object provided with the giraffe jack 31 which can adjust length by rotating around an axis | shaft. The length of the mounting member 30 is adjusted by a giraffe jack 31 so as to be slightly longer than the length from the upper surface of the dynamic vibration absorber 27 to the inner upper surface 26 in an unloaded state. The other end is in contact with the inner upper surface 26. Then, the attachment member 30 presses the dynamic vibration absorber 27 toward the inner bottom surface 23 side by the axial force caused by the vertical tension between the inner bottom surface 23 and the inner upper surface 26, so that the inner bottom surface 23 and the inner upper surface 26 are pressed. The dynamic vibration absorber 27 is fixed to the box girder 22 so as to be sandwiched.

  An attachment member 35 is disposed between the dynamic vibration absorber 28 and the inner upper surface 26. The attachment member 35 is constituted by a columnar object including a giraffe jack 36 whose length can be adjusted by rotating around an axis. The length of the mounting member 35 is adjusted by a giraffe jack 36 so as to be slightly longer than the length from the upper surface of the dynamic vibration absorber 28 to the inner upper surface 26 in an unloaded state, and one end of the mounting member 35 is a dynamic vibration absorber. The other end is in contact with the inner upper surface 26. Then, the attachment member 35 presses the dynamic vibration absorber 28 toward the inner bottom surface 23 side by the axial force caused by the vertical tension between the inner bottom surface 23 and the inner top surface 26, and thereby the inner bottom surface 23 and the inner top surface 26 are pressed. The dynamic vibration absorber 28 is fixed to the box girder 22 so as to be sandwiched.

  The support beam 29, the support beam 32, and the mounting member 33 are respectively disposed between the inner side surface 24 and the dynamic vibration absorber 27, between the dynamic vibration absorber 27 and the dynamic vibration absorber 28, and between the dynamic vibration absorber 28 and the inner side surface 25. However, it is not necessary to float on the inner bottom surface 23, and they may be placed on the inner bottom surface 23.

  Next, a method of attaching the dynamic vibration absorber 27 and the dynamic vibration absorber 28 to the bridge 21 in the dynamic vibration absorber mounting structure according to the second embodiment will be described.

  First, the dynamic vibration absorber 27 is placed on the inner bottom surface 23 of the box-shaped girder 22, and the support beam 29 is sandwiched between the inner side surface 24 and the dynamic vibration absorber 27. The dynamic vibration absorber 28 is placed on the inner bottom surface 23 between the dynamic vibration absorber 27 and the inner side surface 25, and the support beam 32 is interposed between the dynamic vibration absorber 27 and the dynamic vibration absorber 28. At this time, the support beam 29 and the support beam 32 may be temporarily fixed by adhesion or the like in order to prevent the beam from falling.

  Then, the giraffe jack 34 of the mounting member 33 is rotated so that the length of the mounting member 33 is shorter than the length from the side surface on the inner side surface 25 side to the inner side surface 25 of the dynamic vibration absorber 28. The member 33 is inserted between the dynamic vibration absorber 28 and the inner side surface 25.

  Similarly, when the giraffe jacks 31 and 36 of the mounting members 30 and 35 are rotated, the lengths of the mounting members 30 and 35 become shorter than the length from the upper surface of the dynamic vibration absorbers 27 and 28 to the inner upper surface 26, respectively. Thus, the mounting members 30 and 35 are inserted between the dynamic vibration absorbers 27 and 28 and the inner upper surface 26.

  And when it is in a no-load state, the giraffe jack 34 is rotated until the length of the mounting member 33 becomes slightly longer than the length from the side surface on the inner side surface 25 side to the inner side surface 25 in the dynamic vibration absorber 28. Thus, the attachment member 33 is fixed to the box girder 22 by lateral stretching between the inner side surface 24 and the inner side surface 25.

  Similarly, when the load members 30 and 35 are in an unloaded state, the lengths of the attachment members 30 and 35 are slightly longer than the lengths from the upper surfaces of the dynamic vibration absorbers 27 and 28 to the inner upper surface 26, respectively. 36 is rotated, and the attachment members 30 and 35 are fixed to the box girder 22 by vertical stretching between the inner bottom surface 23 and the inner upper surface 26.

  Thus, according to the mounting structure of the dynamic vibration absorber according to the second embodiment, the mounting member 33 is laterally stretched between the inner side surface 24 and the inner side surface 25, and the inner side surface 24 and the inner side by the axial force. The dynamic vibration absorber 27 and the dynamic vibration absorber 28 are fixed to the box girder 22 of the bridge 21 via the support beam 29 and the support beam 32 so as to be sandwiched between the side surface 25 and the side surface 25. For this reason, it becomes possible to fix the dynamic vibration absorber 27 and the dynamic vibration absorber 28 to the bridge 21 by reducing the processing on the bridge 21.

  Furthermore, the dynamic vibration absorber 27 is applied by the axial force so that the attachment member 30 and the attachment member 35 are vertically stretched between the inner bottom surface 23 and the inner upper surface 26 and are sandwiched between the inner bottom surface 23 and the inner upper surface 26. The dynamic vibration absorber 28 is pressed and fixed to the inner bottom surface 23. For this reason, the dynamic vibration absorber 27 and the dynamic vibration absorber 28 can be prevented from floating from the inner bottom surface 23, and the dynamic vibration absorber 27 and the dynamic vibration absorber 28 can be more reliably fixed to the inner bottom surface 23.

Next, a reference form will be described. FIGS. 3A and 3B are diagrams showing a mounting structure of a dynamic vibration absorber according to a reference embodiment, where FIG. 3A is a front view of the bridge, and FIG. 3B is a front view of the bridge as a left side view of the bridge as viewed from the longitudinal direction. . As shown in the figure, the bridge 41 is provided with a pair of I-type girders 2 and 3 supported on a plurality of bridge piers (not shown) as in the first embodiment. Tracks on which the train runs are laid on the top surfaces of the second and third trains.

  A PC cable 43 composed of a plurality of piano wires and the like is stretched along the longitudinal direction of the I-type girders 2 and 3 on the lower surface side of the I-type girders 2 and 3. Dynamic vibration absorbers 46 and 47 are sandwiched between the beams 2 and 3. The PC cable 43 is fixed to a hook 44 and a hook 45 that are locked at both ends in the longitudinal direction of the I-shaped girders 2 and 3 and at the center in the short direction where the upper flange portions 4 and 5 overlap each other. A predetermined tensile tension is applied and an axial force is applied. In FIG. 3 (a), the dynamic vibration absorbers 46 and 47 are shown larger than FIG. 3 (b) for easy understanding.

Next, a method for attaching the dynamic vibration absorber 46 and the dynamic vibration absorber 47 to the bridge 41 in the dynamic vibration absorber mounting structure of the reference embodiment will be described.

  First, the hooks 44 and 45 are locked to both ends in the longitudinal direction of the I-shaped girders 2 and 3 and the center portions in the short direction where the upper flange portions 4 and 5 are overlapped with each other. Hang over the hooks 44 and 45 so as to pass the lower surface side of the second and third sides.

  Then, the dynamic vibration absorbers 46 and 47 are inserted on the lower surface side of the I-shaped beams 2 and 3 so as to be sandwiched between the PC cable 43 and the I-shaped beams 2 and 3. Temporarily fixed to the lower surfaces of the girders 2 and 3 by bonding or the like.

  Thereafter, the PC cable 43 and the hooks 44 and 45 are fixed by applying a predetermined tensile tension to the PC cable 43 laid over the hooks 44 and 45. In this manner, the dynamic vibration absorbers 46 and 47 are fixed to the I-type girders 2 and 3 by the clamping force of the PC cable 43 with respect to the I-type girders 2 and 3.

Thus, according to the mounting structure of the dynamic vibration absorber of the reference form, the dynamic vibration absorbers 46 and 47 are sandwiched between the girders 2 and 3 by the cable that is stretched between the hooks 44 and 45 under tensile tension. Therefore, it is possible to fix the dynamic vibration absorbers 46 and 47 to the bridge 41 by reducing processing on the bridge 41.

  The present invention has been specifically described above based on the embodiment. However, the present invention is not limited to the above embodiment. For example, in the first embodiment and the second embodiment, the mounting member is I. In order to place the girder and box girder, the giraffe jack was rotated to lengthen the mounting member. However, any method can be used if it can be arranged so that the axial force caused by the tension acts on the mounting member. The members may be arranged in an I-type girder and a box-type girder. Therefore, for example, widen the I-type and box-type girders with a jack or the like, insert a rigid mounting member slightly longer than the installation space of the mounting member, It is also possible to return to the above state and fix to the I-type girder and the box-type girder. In addition, the mounting member has a structure that can be elastically expanded and contracted, such as a tension rod, and has a natural length longer than the dimensions of the I-type girder and the box-type girder. Then, it may be arranged in the I-type girder and the box-type girder, and then the reduction of the mounting member may be released and fixed to the I-type girder and the box-type girder.

  In the first embodiment and the second embodiment, when adjusting the length of the mounting member with the giraffe jack, the length in the no-load state is used as a reference, but the torque applied to rotate the giraffe jack The giraffe jack may be rotated until a predetermined torque is obtained.

  In addition, when a clearance gap arises between the axial direction of an attachment member and a support beam, and an attachment member and a support beam, a clearance gap can be filled by driving a wedge etc. in this clearance gap.

DESCRIPTION OF SYMBOLS 1 ... Bridge (structure), 2, 3 ... I type girder, 8, 9 ... Lower flange, 10, 11 ... Inclined surface, 14 ... Dynamic vibration absorber, 15 ... Mounting member, 16 ... Restraint member, 21 ... Bridge ( Structure), 22 ... box girder, 23 ... inner bottom surface, 24, 25 ... inner side surface, 26 ... inner upper surface, 27, 28 ... dynamic vibration absorber, 30, 35 ... mounting member (second mounting member), 33 ... attachment member (first attachment member), 41 ... bridge (structure), 43 ... PC cable (cable), 46, 47 ... dynamic vibration absorber.

Claims (3)

A dynamic vibration absorber is attached to a structure having a pair of girders that are connected to each other with the upper flange portions extending downward to reduce the vibration of the structure,
It has a mounting member that is disposed between the beams facing each other and is fixed to the beam by an axial force caused by lateral stretching.
The girder is an I-type girder having a lower flange portion, and the lower flange portion is formed with an inclined surface that is inclined obliquely downward toward the opposite I-type girder,
The mounting member is stretched and fixed between the inclined surfaces of the facing I-shaped girder,
The dynamic vibration absorber mounting structure, wherein the dynamic vibration absorber is fixed to the mounting member. Wherein disposed between the inclined surface and the upper flange portion, wherein the axial force produced by the longitudinal struts to claim 1, wherein the mounting member and further comprising a restraining member for restraining the movement upwards Mounting structure of dynamic vibration absorber. A dynamic vibration absorber mounting structure for reducing vibration of the structure by attaching the dynamic vibration absorber to the structure having a hollow box girder,
A first attachment member for fixing the dynamic vibration absorber placed on the inner bottom surface to the box-shaped girder by an axial force caused by a lateral tension between the opposite inner side surfaces ;
A dynamic vibration absorber mounting structure , comprising: a second mounting member that fixes the dynamic vibration absorber to the box-shaped girder by an axial force caused by a vertical stretching between the inner upper surface and the inner bottom surface. .

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