JP6955958B2 - Vibration displacement suppression structure of structure - Google Patents

Description

The present invention relates to a structure that suppresses vibration displacement of a structure caused by seismic motion or the like.

Conventionally, in order to improve the seismic resistance of a structure constructed on soft ground with multiple piles reaching the support layer, a solidified improved body was created by performing ground improvement around the footing of the structure. Seismic retrofitting structures are known (see, for example, Patent Document 1).
The solidified improved body in this seismic retrofitting structure is constructed in the vertical direction range to a predetermined depth, and is also constructed in the horizontal direction range to the region outside the upper outer periphery of the structure.
By creating such a solidified structure, the seismic strength of the structure can be increased, and troubles such as bridge girders and other structures supported by the structure being displaced or damaged by the earthquake can be reduced. can.

Japanese Unexamined Patent Publication No. 2013-177741

However, the seismic retrofitting structure of Patent Document 1 simply increases the resistance to seismic motion, and it is necessary to create a huge solidified improved body, which causes an increase in construction cost. ..
Therefore, the present inventors do not increase the resistance to seismic motion to increase the seismic strength of the structure, but suppress the vibration displacement of the structure due to the seismic motion to support the structure. We investigated a technology that makes it difficult for vibrations caused by earthquakes to act on the body.
If vibration due to an earthquake is less likely to act on a structure supported by a structure, the structure is less likely to be affected by the earthquake motion, and troubles caused by the earthquake motion can be reduced.

An object of the present invention is to provide a structure that suppresses vibration displacement of a structure that can suppress vibration displacement of the structure caused by seismic motion or the like.

In order to achieve the above object, the present invention is a vibration displacement suppressing structure of a structure.
A displacement suppressor that is provided in pairs in a layout that sandwiches the structure and has piles connected to it.
A sliding contact body interposed between the displacement suppressing body and the structure,
A pressing body that presses the displacement suppressing body toward the structure, and a pressing body that presses the displacement suppressing body toward the structure.
Equipped with a,
The pressing body is a cable member, and both ends of the cable member are connected to the pair of displacement suppressing bodies in a state where tension is applied.
In the case of a vibration displacement suppressing structure of a structure having such a configuration, for example, when a vibration in a direction in which a pair of displacement suppressing bodies intersect with each other acts on the structure due to a seismic motion, the structure and the displacement suppressing body Energy is absorbed by the action of frictional force between the two, and the vibration of the structure is dampened without being amplified, so that the vibration displacement of the structure can be suppressed.
In addition, by selecting the material and tension force of the sliding contact body, the frictional force acting between the structure and the displacement suppressor can be adjusted, and the vibration displacement of the structure can be efficiently suppressed. It has become.
If the vibration displacement of the structure can be suppressed in this way, for example, the bridge girder supported by the pier of the structure is less likely to be affected by the seismic motion, so that the bridge girder has uneven displacement such as corner breaks and misalignments. It becomes less likely to occur, and troubles in the bridge girder caused by earthquake motion can be reduced.
That is, the vibration displacement suppressing structure of this structure can suppress the vibration displacement of the structure caused by seismic motion or the like, and the structure (for example, the bridge girder) supported by the structure (for example, the pier) has a defect. It can be reduced.
In particular, the cable member is connected to a pair of displacement suppressors at both ends in a state where tension is applied, so that the pressing body (cable member) is connected to both ends of the displacement. By the force (tension force) that attracts the restraining bodies to each other, the paired displacement restraining bodies can be pressed toward the structure in a well-balanced manner, and a frictional force can be satisfactorily applied to both sides of the structure.

In order to achieve the above object, the present invention is a vibration displacement suppressing structure of a structure.
A displacement suppressor that is provided in pairs in a layout that sandwiches the structure and has piles connected to it.
A sliding contact body interposed between the displacement suppressing body and the structure,
A pressing body that presses the displacement suppressing body toward the structure, and a pressing body that presses the displacement suppressing body toward the structure.
With
On the side surface of the structure, a movement restricting portion is provided so as to be arranged alongside the displacement suppressing body at a predetermined interval in a direction in which the pair of displacement suppressing bodies intersect with each other.
In the case of a vibration displacement suppressing structure of a structure having such a configuration, for example, when a vibration in a direction in which a pair of displacement suppressing bodies intersect with each other acts on the structure due to a seismic motion, the structure and the displacement suppressing body Energy is absorbed by the action of frictional force between the two, and the vibration of the structure is dampened without being amplified, so that the vibration displacement of the structure can be suppressed.
In addition, by selecting the material and tension force of the sliding contact body, the frictional force acting between the structure and the displacement suppressor can be adjusted, and the vibration displacement of the structure can be efficiently suppressed. It has become.
If the vibration displacement of the structure can be suppressed in this way, for example, the bridge girder supported by the pier of the structure is less likely to be affected by the seismic motion, so that the bridge girder has uneven displacement such as corner breaks and misalignments. It becomes less likely to occur, and troubles in the bridge girder caused by earthquake motion can be reduced.
That is, the vibration displacement suppressing structure of this structure can suppress the vibration displacement of the structure caused by seismic motion or the like, and the structure (for example, the bridge girder) supported by the structure (for example, the pier) has a defect. It can be reduced.
Then, for example, when the structure is shaken in the direction in which the paired displacement suppressors intersect with each other and the basic structure vibrates significantly, the movement restricting portion hits the displacement suppressor and the movement is restricted. By doing so, the vibration of the structure is not amplified any more, so that the vibration displacement of the structure can be suitably suppressed.

Also, preferably
The displacement suppressor is provided so as to sandwich the footing of the structure.

In this way, if a frictional force is applied to the footing on the lower side of the structure to absorb energy, the vibration displacement of the structure can be efficiently suppressed.

Also, preferably
The displacement suppressor is provided so as to sandwich the structure main body at a position above the footing of the structure.

If the displacement suppressor is embedded in a relatively shallow place so that a frictional force is applied to the structure body located above the footing of the structure, the amount of excavation when installing the displacement suppressor Therefore, it is possible to construct a structure that suppresses vibration displacement of the structure with good workability.

Also, preferably
The structure is formed with through holes in the direction in which the pair of displacement suppressors face each other.
The cable member is inserted into the through hole.

For example, when a pair of displacement suppressors sways in a direction that intersects with the opposite direction acts on the structure and the basic structure sways significantly, the cable member (pressing body) is pushed against the inner peripheral surface of the through hole. Since the cable member is stretched in such a manner, the vibration of the structure is dampened by the tension restored by the cable member, and the vibration displacement of the structure can be suitably suppressed.

Also, preferably
The structure is a pier that supports the bridge girder.
The paired displacement suppressors are arranged so as to face each other along the extending direction of the bridge girder and sandwich the pier.

In the case of a vibration displacement suppressing structure of a structure having such a structure, for example, when a shaking in a direction intersecting the extending direction of the bridge girder acts on the pier due to an earthquake motion, a frictional force acts between the pier and the displacement suppressing body. By doing so, energy is absorbed and the vibration of the pier is attenuated without being amplified, so that the vibration displacement of the pier can be suppressed.
If the vibration displacement of the pier can be suppressed in this way, the bridge girder supported by the pier is less likely to be affected by the earthquake motion, so that the bridge girder is less likely to undergo uneven displacement such as corner breaks and misalignment, which is caused by the earthquake motion. It is possible to reduce the trouble of the bridge girder.

According to the present invention, it is possible to obtain a structure that suppresses vibration displacement of a structure that can suppress vibration displacement of the structure caused by seismic motion or the like.

It is the schematic which shows the vibration displacement suppression structure of the structure of Embodiment 1, and is the front view (a), the side view (b), and the top view (c). It is the schematic which shows the vibration displacement suppression structure of the structure of Embodiment 2, and is the front view (a), the side view (b), and the top view (c). It is the schematic which shows the vibration displacement suppression structure of the structure of Embodiment 3, and is the front view (a), the side view (b), and the top view (c). It is the schematic which shows the vibration displacement suppression structure of the structure of Embodiment 4, and is the front view (a), the side view (b), and the top view (c).

Hereinafter, embodiments of the vibration displacement suppressing structure of the structure according to the present invention will be described in detail with reference to the drawings. However, although the embodiments described below are provided with various technically preferable limitations for carrying out the present invention, the scope of the present invention is not limited to the following embodiments and illustrated examples.

The vibration displacement suppressing structure of the structure of the present embodiment is constructed for the existing pier 1 (structure) in order to suppress the vibration displacement of the pier 1 which is a structure.
The reinforced concrete pier 1 is configured to include a pier body 1a which is a structure main body and a footing 1b provided at the lower part of the pier 1, and the footing 1b of the pier 1 has a plurality of piles reaching the support layer S. 1c is combined.
A bridge girder 2 is installed on the pier 1 via a shoe 3, and the pier 1 supports the bridge girder 2.
In the bridge girder 2 supported by the pier 1, for example, a railroad track is laid along the extending direction thereof.

(Embodiment 1)
The vibration displacement suppressing structure 100 of the structure of the first embodiment is, for example, as shown in FIGS. A sliding contact body 20 interposed between the displacement suppressing body 10 and the pier 1 and a pressing body 30 for pressing the displacement suppressing body 10 toward the pier 1 are provided.

The displacement restraining body 10 is, for example, a block made of reinforced concrete, which is buried in the ground and is provided so as to sandwich the footing 1b of the pier 1.
In particular, the paired displacement suppressors 10 are provided so as to face each other along the extending direction of the bridge girder 2, and sandwich the pier 1 (footing 1b) along the extending direction of the bridge girder 2.
A pile body 11 reaching to the support layer S is coupled to the displacement suppressing body 10.
By burying the displacement suppressing body 10 in the ground, the land under the bridge girder 2 can be maintained flat, so that the land under the bridge girder 2 can be utilized.

The sliding contact body 20 is sandwiched between the displacement suppressing body 10 and the footing 1b of the pier 1, and is arranged in a state where one surface is in contact with the displacement suppressing body 10 and the other surface is in contact with the footing 1b of the pier 1. It is a plate-shaped member.
The sliding contact body 20 is arranged to adjust so that an appropriate frictional force acts between the displacement suppressing body 10 and the pier 1 (footing 1b).
As the sliding contact body 20, for example, a concrete plate-shaped member, a metal plate-shaped member, or a resin plate-shaped member can be used. By selecting the material of the sliding contact body 20, the frictional force acting between the pier 1 and the displacement suppressing body 10 can be adjusted.
In the present embodiment, one sliding contact body 20 is installed between the displacement suppressing body 10 and the bridge pier 1 (footing 1b), but two or more sliding contact bodies 20 are installed to reduce the frictional force. Adjustments may be made. At that time, the sliding contact bodies 20 made of different materials may be stacked and installed.

The pressing body 30 has a function of bringing the sliding contact body 20 into close contact with the displacement suppressing body 10 and the footing 1b of the pier 1 by pressing the displacement suppressing body 10 toward the footing 1b of the pier 1.
The pressing body 30 here is a cable member having one end connected to one displacement suppressing body 10 and the other end connected to the other displacement suppressing body 10, and the cable member has displacement suppressing connected to both ends. The tension that attracts the bodies 10 to each other is applied. In other words, the pressing body 30 is connected to a displacement suppressing body 10 whose ends are paired with each other in a state where tension is applied.
With such a cable-shaped pressing body 30, the paired displacement suppressing bodies 10 can be pressed toward the footing 1b of the pier 1 in a well-balanced manner.
A fixing plate 31 is fixedly provided at the end of the pressing body 30 (cable member) to connect the pressing body 30 and the displacement suppressing body 10.
Further, the tension force here is determined by the material and tension force of the sliding contact body 20 according to the required frictional force.

In the case of the vibration displacement suppressing structure 100 of the structure configured as described above, for example, when the vibration in the direction intersecting the extending direction of the bridge girder 2 acts on the pier 1, the pier 1 (footing 1b) and the pier 1 (footing 1b). Since the vibration of the pier 1 is dampened without being amplified by the frictional force acting between the displacement suppressing body 10 and the displacement suppressing body 10, the vibration displacement of the pier 1 can be suppressed.

If the vibration displacement of the pier 1 can be suppressed in this way, the bridge girder 2 supported by the pier 1 is less likely to be affected by the seismic motion, so that the bridge girder 2 is less likely to undergo uneven displacement such as corner breaks and misalignments. It is possible to reduce the trouble of the bridge girder 2 caused by the earthquake motion.
That is, the vibration displacement suppressing structure 100 of the structure of the first embodiment can suppress the vibration displacement of the pier 1 due to seismic motion or the like, and reduce the defects that occur in the bridge girder 2 supported by the pier 1. Can be done.

(Embodiment 2)
Next, the second embodiment of the vibration displacement suppressing structure of the structure according to the present invention will be described. The same parts as those in the first embodiment are designated by the same reference numerals, and only different parts will be described.

As shown in FIGS. 2A, 2B, and 2C, for example, the vibration displacement suppressing structure 100 of the structure of the second embodiment is provided in pairs in an arrangement sandwiching the pier body 1a of the pier 1. It includes a displacement suppressing body 10, a sliding contact body 20 interposed between the displacement suppressing body 10 and the pier body 1a of the pier 1, a pressing body 30 that presses the displacement suppressing body 10 toward the pier 1, and the like. ..

The displacement restraining body 10 is, for example, a block made of reinforced concrete, which is embedded so as to partially expose the ground surface and is provided so as to sandwich the pier body 1a of the pier 1.
In particular, the paired displacement suppressors 10 are provided so as to face each other along the extending direction of the bridge girder 2, and the pier body 1a (structure body) of the pier 1 is provided along the extending direction of the bridge girder 2. Is sandwiched between them.

The sliding contact body 20 is sandwiched between the displacement suppressing body 10 and the pier body 1a of the pier 1, and is arranged in a state where one surface is in contact with the displacement suppressing body 10 and the other surface is in contact with the pier body 1a of the pier 1. It is a plate-shaped member provided.
The sliding contact body 20 is arranged so as to adjust so that an appropriate frictional force acts between the displacement suppressing body 10 and the pier 1 (pier body 1a).

The pressing body 30 has a function of pressing the displacement suppressing body 10 toward the pier body 1a of the pier 1 to bring the sliding contact body 20 into close contact with the displacement suppressing body 10 and the pier body 1a of the pier 1. It is a member.

Even with the vibration displacement suppression structure 100 of a structure having such a configuration, for example, when a sway in a direction intersecting the extending direction of the bridge girder 2 acts on the pier 1 due to an earthquake motion, the pier 1 (pier body 1a). By the frictional force acting between the displacement suppressing body 10 and the displacement suppressing body 10, the vibration of the pier 1 is dampened without being amplified, so that the vibration displacement of the pier 1 can be suppressed.
As described above, the vibration displacement suppressing structure 100 of the structure of the second embodiment can suppress the vibration displacement of the pier 1 due to the seismic motion or the like, and reduces the defects that occur in the bridge girder 2 supported by the pier 1. can do.

Further, in the case of a structure such as the vibration displacement suppressing structure 100 of the structure of the second embodiment, in which the displacement suppressing body 10 is shallowly buried so as to be exposed on the ground surface, the amount of excavation when installing the displacement suppressing body 10 is increased. Since the number can be reduced, the vibration displacement suppressing structure 100 of the structure can be constructed with good workability.

(Embodiment 3)
Next, the third embodiment of the vibration displacement suppressing structure of the structure according to the present invention will be described. The same parts as those in the second embodiment (first embodiment) are designated by the same reference numerals, and only different parts will be described.

As shown in FIGS. 3A, 3B, and 3C, for example, the vibration displacement suppressing structure 100 of the structure of the third embodiment is provided in pairs in an arrangement sandwiching the pier body 1a of the pier 1. A cable member or the like as a displacement suppressing body 10, a sliding contact body 20 interposed between the displacement suppressing body 10 and the pier body 1a of the pier 1, and a pressing body 30 for pressing the displacement suppressing body 10 toward the pier 1. Is equipped with.
The pressing body 30 (cable member) is connected to a displacement suppressing body 10 whose ends are paired with each other in a state where tension is applied.
Further, in the pier body 1a of the pier 1, a through hole 1d is formed in the direction in which the paired displacement restraining bodies 10 face each other and along the extending direction of the bridge girder 2.

The pressing body 30 which is a cable member is arranged so as to be inserted through a through hole 1d formed in the pier body 1a (pier 1), and presses the displacement suppressing body 10 toward the pier body 1a of the pier 1. Therefore, it has a function of bringing the sliding contact body 20 into close contact with the displacement suppressing body 10 and the pier body 1a of the pier 1.

Even with the vibration displacement suppression structure 100 of a structure having such a configuration, for example, when a sway in a direction intersecting the extending direction of the bridge girder 2 acts on the pier 1 due to an earthquake motion, the pier 1 (pier body 1a). Energy is absorbed by the action of frictional force between the displacement suppressor 10 and the displacement suppressor 10, and the vibration of the pier 1 is dampened without being amplified, so that the vibration displacement of the pier 1 can be suppressed.
In particular, when the pier 1 shakes significantly in the direction intersecting the extending direction of the bridge girder 2, the pressing body 30 (cable member) is stretched so as to be pushed by the inner peripheral surface of the through hole 1d. The vibration of the pier 1 is also attenuated by the tension force restored by the cable member), and the vibration displacement of the pier 1 can be suitably suppressed.
As described above, the vibration displacement suppressing structure 100 of the structure of the third embodiment can suppress the vibration displacement of the pier 1 due to the seismic motion or the like, and reduces the defects that occur in the bridge girder 2 supported by the pier 1. can do.

(Embodiment 4)
Next, the fourth embodiment of the vibration displacement suppressing structure of the structure according to the present invention will be described. The same parts as those in the first embodiment are designated by the same reference numerals, and only different parts will be described.

The vibration displacement suppressing structure 100 of the structure of the fourth embodiment is, for example, as shown in FIGS. The restraint body 10, the sliding contact body 20 interposed between the displacement restraint body 10 and the footing 1b of the pier 1, the pressing body 30 that presses the displacement restraint body 10 toward the pier 1 (footing 1b), and the displacement. A movement restricting unit 1e or the like provided on the side surface of the pier 1 (footing 1b) is provided in an arrangement in which the restraining body 10 is arranged side by side at a predetermined interval.

The movement control unit 1e is, for example, a block made of reinforced concrete, and is fixed to the side surface of the footing 1b of the pier 1 by post-installed anchors 1f.
In the present embodiment, a pair of movement restricting portions 1e are fixed to both side surfaces of the footing 1b so as to form a pair in the direction along the extending direction of the bridge girder 2.
Specifically, the movement restricting unit 1e is a displacement suppressing body at a predetermined interval in a direction in which the paired displacement suppressing bodies 10 intersect the opposite directions and intersect with the extending direction of the bridge girder 2. It is provided in the same arrangement as 10.

The displacement restraining body 10 is, for example, a block made of reinforced concrete, which is buried in the ground and is provided so as to sandwich the footing 1b of the pier 1.
In the present embodiment, two sets of displacement restraining bodies 10 are provided so as to form a pair in a direction along the extending direction of the bridge girder 2. Then, displacement suppressing bodies 10 are provided on both sides of the movement restricting portion 1e on one side surface of the footing 1b at predetermined intervals, and displacement suppressing is performed on both sides of the movement restricting portion 1e on the other side surface of the footing 1b at predetermined intervals. A body 10 is provided.

The pressing body 30 has a function of bringing the sliding contact body 20 into close contact with the displacement suppressing body 10 and the footing 1b of the pier 1 by pressing the displacement suppressing body 10 toward the footing 1b of the pier 1.
One end of the pressing body 30 according to the fourth embodiment is fixed to the movement restricting portion 1e, and the fixing plate 31 is fixedly attached to the other end portion. Tension is applied to draw towards.
Then, the fixing plate 31 is pulled toward the displacement suppressing body 10 so that the pressing body 30 pulls the fixing plate 31 toward the movement restricting portion 1e, and the displacement suppressing body 10 is pressed toward the footing 1b of the pier 1. It has become like.
In particular, the sliding contact body 20 is also interposed between the fixing plate 31 and the displacement suppressing body 10, and is designed so that an appropriate frictional force acts between the displacement suppressing body 10 and the fixing plate 31.

Even in the vibration displacement suppressing structure 100 of the structure having such a configuration, for example, when the pier 1 is shaken in the direction intersecting the extending direction of the bridge girder 2 due to the earthquake motion, the pier 1 (footing 1b) and the pier 1 (footing 1b). Energy is absorbed by the action of frictional force with the displacement suppressing body 10, and the vibration of the pier 1 is dampened without being amplified, so that the vibration displacement of the pier 1 can be suppressed.
In particular, when the pier 1 sways significantly in the direction intersecting the extending direction of the bridge girder 2, the movement restricting unit 1e hits the displacement restraining body 10 and its movement is restricted, so that the vibration of the pier 1 is not amplified any more. Therefore, the vibration displacement of the pier 1 can be suppressed.
As described above, the vibration displacement suppressing structure 100 of the structure of the fourth embodiment can suppress the vibration displacement of the pier 1 due to the seismic motion or the like, and reduces the defects that occur in the bridge girder 2 supported by the pier 1. can do.

As described above, the vibration displacement suppressing structure 100 of the structure of the present embodiment (Embodiments 1 to 4) can suppress the vibration displacement of the pier 1 due to seismic motion or the like, and the pier 1 supports it. It is possible to reduce the occurrence of defects in the existing bridge girder 2.

In the above embodiment, the suppression of the vibration displacement of the pier 1 of the pile foundation structure in which the pile 1c is connected to the footing 1b has been described as an example, but the present invention is not limited to this. The present invention can also be applied to the suppression of the vibration displacement of the pier 1 of the caisson foundation structure and the suppression of the vibration displacement of the pier 1 of the direct foundation structure.

Further, in the above embodiment, the frictional force acting between the pier 1 and the displacement suppressing body 10 is adjusted by the sliding contact body 20 interposed between the pier 1 and the displacement suppressing body 10. However, the present invention is not limited to this, and the vibration displacement of the pier 1 is suppressed by the frictional force of directly sliding the pier 1 and the displacement suppressing body 10 without using the sliding contact body 20. You may try to do it.

Further, in the above embodiment, the pile body 11 coupled to the displacement suppressing body 10 is arranged in the vertical direction, but the present invention is not limited to this, and the pile body 11 is not limited to this. , It may be an oblique pile arranged in an inclined posture.

In addition, it goes without saying that the specific detailed structure and the like can be changed as appropriate.

1 Pier (structure)
1a Pier body (structure body)
1b Footing 1c Pile 1d Through hole 1e Movement regulation part 1f Post-installed anchor 2 Bridge girder 3 沓 10 Displacement suppression body 11 Pile body 20 Sliding body 30 Pressing body (cable member)
31 Fixed plate 100 Vibration displacement suppression structure of structure S Support layer

Claims (6)

A displacement suppressor that is provided in pairs in a layout that sandwiches the structure and has piles connected to it.
A sliding contact body interposed between the displacement suppressing body and the structure,
A pressing body that presses the displacement suppressing body toward the structure, and a pressing body that presses the displacement suppressing body toward the structure.
Equipped with a,
The pressing body is a cable member, and the vibration displacement suppressing structure of the structure is characterized in that both ends of the cable member are connected to the paired displacement suppressing bodies in a state where tension force is applied. A displacement suppressor that is provided in pairs in a layout that sandwiches the structure and has piles connected to it.
A sliding contact body interposed between the displacement suppressing body and the structure,
A pressing body that presses the displacement suppressing body toward the structure, and a pressing body that presses the displacement suppressing body toward the structure.
Equipped with a,
A movement restricting portion is provided on the side surface of the structure so as to be aligned with the displacement restraint body at a predetermined interval in a direction in which the pair of displacement restraint bodies intersect with each other. Vibration displacement suppression structure of the structure. The structure is formed with through holes in the direction in which the pair of displacement suppressors face each other.
The vibration displacement suppressing structure of the structure according to claim 1, wherein the cable member is inserted through the through hole. The vibration displacement suppressing structure of a structure according to any one of claims 1 to 3, wherein the displacement suppressing body is provided in an arrangement that sandwiches the footing of the structure. The structure according to any one of claims 1 to 3, wherein the displacement suppressor is provided so as to sandwich the structure main body at a position higher than the footing of the structure. Vibration displacement suppression structure. The structure is a pier that supports the bridge girder.
The vibration of the structure according to any one of claims 1 to 5 , wherein the paired displacement suppressors face each other along the extending direction of the bridge girder and are arranged to sandwich the pier. Displacement suppression structure.

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