JP2019073886A - Vibration displacement suppressing structure of structure group - Google Patents

Abstract

To realize the vibration displacement suppressing structure of a structure group that can suppress vibration displacement of a plurality of structures caused by an earthquake motion, etc.SOLUTION: The vibration displacement structure 100 of a structure group can suppress vibration displacement of a bridge pier 1 when, for example, a swing caused by an earthquake motion operates on the bridge pier 1, because the amplitude difference and phase difference between adjoining bridge piers 1 are reduced due to transmission of vibration by a pair of underground walls 10 that are joined to the footing 1b of the bridge pier 1 and connect the adjoining bridge piers 1, so that vibration of the bridge pier 1 is not amplified but is attenuated. If vibration displacement of the bridge pier 1 which is a structure can be suppressed in this way, the bridge pier 2 supported by the bridge pier 1 is less influenced by the earthquake motion, so that uneven displacement such as corner folding and unevenness may be less likely to occur in the bridge pier 2 and the number of troubles in the bridge pier 2 caused by the earthquake motion may be decreased.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vibration displacement suppression structure of a group of structures that suppresses vibration displacement of a plurality of structures caused by earthquake motion or the like.

In the past, in order to improve the earthquake resistance of the structure built on a soft ground, which has a plurality of piles that reach the support layer, a solidified improvement body was created by applying ground improvement around the footing of the structure The seismic strengthening structure is known (for example, refer to patent documents 1).
The solidified improved body in this aseismatic reinforcing structure is constructed to a predetermined depth in the vertical range and to an area outside the upper outer periphery of the structure in the horizontal range.
By creating such a solidified improved body, it is possible to increase the seismic strength of the structure and to reduce troubles such as displacement or breakage of a structure such as a bridge girder supported by the structure due to earthquake. it can.

JP, 2013-177741, A

However, the aseismatic reinforcing structure of Patent Document 1 is a reinforcing structure of a single structure such as forming a solidifying improvement body in each structure to simply increase the resistance to earthquake motion, and a plurality of structures such as viaducts. It was not intended for a group of structures in which objects (such as bridge piers) are connected.
Therefore, the inventors of the present invention do not increase the seismic strength of individual structures, but consider a plurality of structures as a structure group to suppress vibration displacement of the structures caused by earthquake motion, and to adjacent structures. We examined the technology that makes it difficult for seismic vibration to act on the structure supported by the structure by making the displacement of the same.
If it becomes difficult for vibration due to earthquake to act on the structure supported by the structure, the structure becomes less susceptible to earthquake motion, and it is possible to reduce troubles caused by earthquake motion.

  An object of the present invention is to provide a vibration displacement suppression structure of a group of structures capable of suppressing vibration displacement of a plurality of structures caused by earthquake motion or the like.

In order to achieve the above object, the present invention is
A vibration displacement suppression structure of a group of structures in which a plurality of structures are connected,
A pair of underground walls which extend in a direction in which the plurality of structures extend and which are embedded to a predetermined depth in an arrangement sandwiching the footings of the structures;
A connecting member whose both ends are connected to the pair of underground walls so that the pair of underground walls restrains the footing, and a part of the pair of underground walls is joined to the footing of the structure When,
To have

In the case of the vibration displacement suppression structure of a group of structures having such a configuration, for example, when shaking due to earthquake motion acts on the structure, it is joined to the footings of the structure so as to sandwich and restrain the footings of the structure. The vibration of the structure is attenuated without being amplified by the vibration transmission by the pair of underground walls sandwiching and connecting the structure, so that the vibration displacement of the structure can be suppressed.
Specifically, when vibration due to earthquake motion or the like acts on a structure to vibrate the structure, if there is a difference in amplitude in the vibration of adjacent structures, a pair of grounds connecting the structures Vibration transmission by the inner wall reduces the amplitude difference, and the vibration of the adjacent structure is attenuated without being amplified, and the vibration displacement of the structure can be suppressed. In addition, even when there is a phase difference in the vibrations of adjacent structures, the phase difference is reduced by the vibration transmission by the pair of underground walls connecting the structures, and the vibration displacement of the adjacent structures is suppressed. can do.
That is, the vibration displacement suppression structure of this group of structures can suppress the vibration displacement of a plurality of structures caused by earthquake motion or the like, and a structure (for example, bridge girder) supported by the structure (for example, bridge pier) Can be reduced.

Also preferably,
A rigid body is provided at the top of the underground wall,
Both ends of the connecting member are connected to the rigid body such that the rigid body is joined to the footing of the structure.

  By sandwiching the footing of the structure with a rigid body provided at the upper part of the underground wall, vibration displacements of a plurality of structures due to earthquake motion can be suitably suppressed, and the structure (for example, bridge piers) It is possible to reduce the occurrence of failure in the structure (eg, bridge girder) supported by

Also preferably,
The underground wall is buried deeper as the distance between the adjacent structures is longer.

For example, the farther the distance between adjacent structures (e.g., bridge piers), the longer (heavy) the structures (e.g., bridge beams) bridged over those structures.
The heavier the structure bridged by the structure, the larger the inertial force when shaking due to earthquake motion or the like acts on the structure, so the vibration displacement of the structure tends to be larger. Therefore, in order to suitably reduce the relatively large vibrational displacement generated in the structure, the underground wall is installed so as to relatively increase the rigidity of the underground wall installed between the relatively distantly arranged structures. Bury more deeply.

On the other hand, the closer the distance between adjacent structures (e.g., bridge piers), the shorter and lighter the structures (e.g., bridge beams) bridged over the structures.
The lighter the structure that is bridged by the structure, the smaller the inertial force when a shake caused by earthquake motion or the like acts on the structure, so that a relatively small vibrational displacement occurs in the structure. Therefore, in order to suitably reduce the relatively small vibrational displacement generated in the structure, the underground wall should be relatively lowered so as to lower the rigidity of the underground wall installed between the relatively close arranged structures. Bury relatively shallow.

  In this way, even if there is a difference in the distance between adjacent structures, vibration displacement can be suppressed according to the distance between the adjacent structures, so a plurality of connected structures can be obtained. Can be adjusted to the same degree.

Also preferably,
The footing of the above-mentioned structure is connected with a pile reaching to the support layer,
The underground wall is embedded deeper as the support layer is located deeper in the installation site of the structure.

For example, the deeper the depth to the support layer at the installation site of the structure, the longer the length of the pile connected to the footing of the structure.
The longer the pile of the structure, the larger the inertial force when shaking caused by earthquake motion or the like acts on the structure, so the vibration displacement of the structure tends to be larger. Therefore, in order to suitably reduce the relatively large vibrational displacement generated in the structure, the underground wall should be made relatively high so that the rigidity of the underground wall installed at a deep depth to the support layer is relatively high. Bury deeper.

On the other hand, the shallower the depth to the support layer at the installation site of the structure, the shorter the length of the pile connected to the footing of the structure.
The shorter the pile of the structure, the smaller the inertial force when the shaking caused by the earthquake or the like acts on the structure, so that a relatively small vibrational displacement occurs in the structure. Therefore, in order to suitably reduce relatively small vibrational displacement generated in the structure, the underground wall should be made relatively low so that the rigidity of the underground wall installed at a location where the depth to the support layer is shallow is relatively low. Bury relatively shallow.

  By doing this, even if there is a difference in the depth to the support layer at each installation location of the structure, it is possible to suppress vibration displacement according to the depth to the support layer, so a plurality of linked structures Can be adjusted to the same degree.

  According to the present invention, it is possible to obtain a structure for suppressing vibration displacement of a group of structures capable of suppressing vibration displacement of a plurality of structures caused by earthquake motion or the like.

It is the schematic which shows the vibrational displacement suppression structure of the structure group of Embodiment 1, and is a side view (a), a top view (b), and a front view (c). It is the schematic which shows the modification of the vibrational displacement suppression structure of a structure group, and is a side view (a), a top view (b), and a front view (c). It is the schematic which shows the modification of the vibrational displacement suppression structure of a structure group, and is a side view (a), a top view (b), and a front view (c). It is explanatory drawing regarding the connection structure of the footing of a bridge pier and a rigid body, and is a connection structure (a) which can be slid, a connection structure (b) using a post construction anchor, and a connection structure (c) using a damping body. is there. It is the schematic which shows the modification of the vibrational displacement suppression structure of the structure group of Embodiment 1, and is a side view (a), a top view (b), and a front view (c). It is a schematic side view which shows the vibrational displacement suppression structure of the structure group of Embodiment 2. FIG. It is a schematic side view which shows the vibrational displacement suppression structure of the structure group of Embodiment 3. FIG.

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

The vibration displacement suppression structure of the structure group of the present embodiment is constructed for the existing bridge pier 1 (structure) in order to suppress the vibration displacement of the bridge pier 1 which is the structure. In particular, it is constructed for a group of structures in which a plurality of bridge piers 1 are connected.
The reinforced concrete bridge pier 1 comprises a bridge pier main body 1a which is a structural body, and a footing 1b provided at the lower part of the bridge pier 1, and a plurality of piles reaching the support layer S in the footing 1b of the bridge pier 1 1c is coupled.
A bridge girder 2 is installed on the bridge pier 1 via a gutter 3 and the bridge pier 2 supports the bridge girder 2.
Note that, for example, a railway track is laid along the extending direction of the bridge girder 2 supported by the bridge pier 1.

(Embodiment 1)
For example, as shown in FIGS. 1 (a), (b) and (c), the vibration displacement suppression structure 100 of the structure group of the first embodiment extends in the direction in which a plurality of bridge piers 1 are connected. The both ends are connected to the pair of underground walls 10 so that the footing 1b is restrained by the pair of underground walls 10 embedded to a predetermined depth in a sandwiching arrangement and a pair of underground walls 10, It has a connecting member 20 etc. which joins a part of the underground wall 10 to the footing 1 b of the bridge pier 1.

The underground wall 10 is, for example, a wall formed by connecting a plurality of steel sheet piles 11 (sheet piles) in a row.
In the present embodiment, a plurality of steel sheet piles 11 are provided in a row on both sides of the bridge pier 1 so as to form a pair of underground walls 10 in an arrangement sandwiching the footing 1b of the bridge pier 1, It is formed.
Here, the underground wall 10 is formed such that the lower end of the steel sheet pile 11 reaches, for example, a half depth of the length of the pile 1 c of the bridge pier 1.

In addition, a rigid body 12 is provided at the top of the underground wall 10.
The rigid body 12 is, for example, a concrete coping formed by rolling up an upper portion of a wall formed of a plurality of steel sheet piles 11 and placing a concrete material.
The rigid body 12 is coupled to the upper portions of the plurality of steel sheet piles 11 and constitutes a part of the underground wall 10.

Both ends of the connecting member 20 are connected to the pair of underground walls 10, and the pair of underground walls 10 is maintained so as not to spread at a predetermined interval.
The connecting member 20 is, for example, an H-shaped steel, and both ends thereof are embedded in the rigid body 12 and connected to the upper portion of the underground wall 10.
The connecting member 20 is installed, for example, in the direction orthogonal to the wall body consisting of a plurality of steel sheet piles 11 formed on both sides of the bridge pier 1, and both ends thereof are fixed to the rigid body 12 in the process of forming the rigid body 12. It is embedded and installed.
That is, both ends of the connecting member 20 are connected to the rigid body 12 forming the upper part of the underground wall 10, and the rigid body 12 of the underground wall 10 is joined to the footing 1 b of the bridge pier 1 by the connecting member 20.
The rigid bodies 12 of the pair of underground walls 10 connected to both ends of the connecting member 20 are joined to the footings 1b of the bridge pier 1 to restrain the footings 1b.

A pair of underground walls 10 joined to restrain footing 1b of bridge pier 1 by connecting member 20 connect adjacent bridge piers 1 and transmit the vibration of one bridge pier 1 to the other bridge pier 1 And the vibration of the other bridge 1 can be transmitted to the one bridge 1.
As described above, a pair of underground walls 10 connecting adjacent bridge piers 1 has a function of acting as a medium in which the bridge piers 1 on both sides act on each other's vibration and synchronizing the behavior of the adjacent bridge piers 1 ing.

For example, when vibration due to earthquake motion or the like acts on the bridge pier 1 and the bridge pier 1 vibrates, when there is an amplitude difference in the vibrations of the adjacent bridge piers 1, a pair of underground walls 10 connecting the bridge piers 1. The amplitude difference is reduced by the vibration transmission due to the vibration of the bridge 1. The vibration of the adjacent bridge 1 is attenuated without being amplified, and the vibration displacement of the bridge 1 can be suppressed.
Further, even if there is a phase difference in the vibrations of adjacent bridge legs 1, the phase difference is reduced by the vibration transmission by the pair of underground walls 10 connecting the bridge legs 1, and the vibration displacement of the adjacent bridge legs 1 is It can be suppressed.

  In the case of the vibration displacement suppressing structure 100 of the structure group configured as described above, for example, when shaking in a direction intersecting the extending direction of the bridge girder 2 acts on each bridge pier 1 due to earthquake motion, the bridge piers 1 are connected By vibration transmission by the pair of underground walls 10, the vibration of the bridge 1 is attenuated without being amplified, so that the vibration displacement of the bridge 1 can be suppressed.

Thus, if the vibration displacement of the bridge pier 1 can be suppressed, the bridge girder 2 supported by the bridge pier 1 becomes less susceptible to the influence of the earthquake motion, so that unequal displacement such as angular breakage or misunderstanding in the bridge girder 2 is less likely to occur. The trouble of the bridge girder 2 resulting from an earthquake motion can be reduced.
That is, the vibration displacement suppressing structure 100 of the structure group of the first embodiment can suppress the vibration displacement of the plurality of bridge piers 1 caused by the earthquake motion and the like, and the fault generated in the bridge girder 2 supported by the bridge piers 1 is It can be reduced.

The present invention is not limited to the above embodiment.
For example, as shown in FIGS. 2 (a), (b) and (c), a tie rod may be used as the connecting member 20, for example.
Here, the connection member 20 which is a tie rod is disposed in a direction perpendicular to the wall body consisting of a plurality of steel sheet piles 11 formed on both sides of the bridge pier 1, for example, and both ends of the connection member 20 are wall bodies (plurality The steel sheet piles 11) are installed so as to penetrate, and bearing plates 21 are fixedly provided at the end portions of the penetrating connection members 20, respectively. Both ends of the connecting member 20 on which the bearing plate 21 is fixed are embedded in the rigid body 12 and connected to the upper portion of the underground wall 10.
Even in the vibration displacement suppressing structure 100 of the structure group having such a configuration, the vibration displacement of the plurality of bridge piers 1 caused by the earthquake motion or the like can be suppressed, and occurs in the bridge girder 2 supported by those bridge piers 1 Problems can be reduced.

Further, as shown in FIGS. 3 (a), (b) and (c), a reinforced concrete body may be used as the connecting member 20, for example.
Here, the connecting member 20 which is a reinforced concrete body is disposed, for example, in a direction orthogonal to the wall body consisting of a plurality of steel sheet piles 11 formed on both sides of the bridge pier 1, and both ends of the connecting member 20 are rigid bodies 12. Connected to one another. For example, a frame capable of integrally molding the connecting member 20 and the rigid body 12 is assembled to form the rigid body 12 together with the connecting member 20 of the reinforced concrete, and both ends of the connecting member 20 are integrally formed with the rigid body 12 It can be connected. Thus, both ends of the connecting member 20 are integrally connected to the rigid body 12 and connected to the upper portion of the underground wall 10.
Even in the vibration displacement suppressing structure 100 of the structure group having such a configuration, the vibration displacement of the plurality of bridge piers 1 caused by the earthquake motion or the like can be suppressed, and occurs in the bridge girder 2 supported by those bridge piers 1 Problems can be reduced.

  Further, in the first embodiment, as shown in FIG. 4A, the rigid body 12 is joined so as to sandwich the footing 1b of the bridge pier 1, and the horizontal direction is established between the slidable rigid body 12 and the footing 1b. Although it was set as the connection structure which can transmit power, it does not restrict to this.

For example, as shown in FIG. 4 (b), the post construction anchor 13 is driven into the footing 1b of the bridge pier 1, and then the end of the construction anchor 13 is embedded in the rigid body 12 of the underground wall 10 12 and the footing 1b may be rigidly connected. The end of the post-construction anchor 13 is preferably connected to the steel sheet pile 11 forming the underground wall 10 through a stud.
By rigidly connecting the rigid body 12 and the footing 1b in this way, in addition to the transmission of horizontal force between the rigid body 12 and the footing 1b, a transmission structure capable of transmitting a bending moment is also provided. It can suppress more suitably.

Further, as shown in FIG. 4C, the damping body 30 may be interposed between the footing 1b of the bridge pier 1 and the rigid body 12 of the underground wall 10.
The damping body 30 is, for example, a friction damper or a viscous damper, and has a function of dissipating vibrational energy between the footing 1b and the rigid body 12 to reduce the amplitude of the vibration of each bridge pier 1.
If it is a connection structure provided with such a damping body 30, the vibration displacement of the bridge pier 1 can be suppressed more suitably.

In addition, the underground wall 10 is not limited to extending continuously in the direction in which the plurality of bridge piers 1 continues, for example, as shown in FIGS. 5 (a), (b) and (c), predetermined bridge piers It may have a structure divided between one.
Even in the vibration displacement suppressing structure 100 of the structure group having such a configuration, the facing underground wall 10 is restrained by sandwiching the footing 1b of the bridge pier 1, and the bridge girder 2 supported by the bridge pier 1 Can be reduced.

Second Embodiment
Next, a second embodiment of the vibration displacement suppression structure for a structure group according to the present invention will be described. The same parts as in the first embodiment are given the same reference numerals, and only different parts will be described.

For example, as shown in FIG. 6, the vibration displacement suppression structure 100 of the structure group according to the second embodiment extends in a direction in which a plurality of bridge piers 1 are continuous and is embedded in a configuration sandwiching the footing 1 b of the bridge pier 1. The underground wall 10 and the connecting member 20 etc. which joins the rigid body 12 of a pair of underground wall 10 upper part to the footing 1b of the pier 1. As shown in FIG.
In particular, the underground wall 10 here is buried at a depth corresponding to the distance between adjacent bridge piers 1.
Specifically, the underground wall 10 is buried deeper as the distance between adjacent piers 1 is longer and deeper as the distance between adjacent piers 1 is shorter. .

As the distance between adjacent bridge piers 1 increases, the bridge girder 2 bridged over the bridge piers 1 becomes longer and heavier.
As the bridge girder 2 bridged to the bridge pier 1 is heavier, the vibration displacement of the bridge pier 1 is apt to be large because the inertia force when the sway caused by the earthquake or the like acts on the bridge pier 1 is large.
Therefore, in order to relatively increase the rigidity of the underground wall 10 installed between the relatively distantly placed bridge piers 1 in order to suitably reduce the relatively large vibration displacement generated in the bridge pier 1, the underground Bury the wall 10 deeper.

On the other hand, as the distance between adjacent bridge piers 1 is shorter, the bridge girder 2 bridged over the bridge piers 1 becomes shorter and lighter.
The lighter the bridge girder 2 bridged to the bridge pier 1, the smaller the inertial force when the shaking caused by the seismic motion acts on the bridge pier 1, so that a relatively small vibration displacement occurs in the bridge pier 1.
Therefore, in order to suitably reduce the relatively small vibration displacement generated in the bridge pier 1, the underground wall 10 placed between the bridge piers 1 in a relatively close arrangement is made to be relatively low in rigidity. Bury 10 relatively shallow.

  By doing this, even if there is a difference in the distance between the adjacent bridge piers 1, vibration displacement can be suppressed according to the distance between the adjacent bridge piers 1. Can be adjusted to the same degree.

Even in the vibration displacement restraining structure 100 of the structure group having such a configuration, for example, when the sway caused by the earthquake motion acts on the bridge pier 1, the vibration transmission by the pair of underground walls 10 connecting the bridge piers 1. Since the vibration of the bridge pier 1 is attenuated without being amplified, the vibration displacement of the bridge pier 1 can be suppressed.
In particular, in the case of the vibration displacement suppressing structure 100 of the structure group according to the second embodiment, since the vibration displacement can be suppressed according to the distance between adjacent bridge legs 1, the vibration displacements of a plurality of consecutive bridge legs 1 are the same. It can be adjusted to the extent.

  As described above, the vibration displacement suppression structure 100 of the structure group of the second embodiment can suppress the vibration displacement of the plurality of bridge piers 1 caused by the earthquake motion or the like, and occurs in the bridge girder 2 supported by the bridge piers 1. Problems can be reduced.

(Embodiment 3)
Next, a third embodiment of the vibration displacement suppression structure of a structure group according to the present invention will be described. The same parts as in the first embodiment are given the same reference numerals, and only different parts will be described.

For example, as shown in FIG. 7, the vibration displacement suppression structure 100 of the structure group according to the third embodiment extends in a direction in which a plurality of bridge piers 1 are continuous and is embedded in an arrangement sandwiching the footing 1 b of the bridge pier 1. The underground wall 10 and the connecting member 20 etc. which joins the rigid body 12 of a pair of underground wall 10 upper part to the footing 1b of the pier 1. As shown in FIG. In FIG. 7, the bridge girder 2 on the right end side is bridged between the abutment 4 and the bridge pier 1, and a pair of underground walls 10 are provided until the footing of the abutment 4 is sandwiched.
In particular, the underground wall 10 here is buried at a depth corresponding to the depth to the support layer S at the installation position of the bridge pier 1.
Specifically, the underground wall 10 is buried deeper as the depth to the support layer S is deeper, and shallower as the depth to the support layer S is shallower.
The depth to which the underground wall 10 is embedded is not simply increased or decreased according to the depth to the support layer S, but a threshold is provided for each range of depth, and the underground wall 10 is formed before and after the threshold. It is sufficient to switch the depth to embed the

As the depth to the support layer S is deeper, the length of the pile 1c coupled to the footing 1b of the bridge pier 1 becomes longer.
The longer the pile 1c of the bridge pier 1 is, the larger the inertial force is when vibration due to seismic motion or the like acts on the bridge pier 1, so the vibration displacement of the bridge pier 1 tends to be large.
Therefore, in order to suitably reduce the relatively large vibration displacement generated in the bridge pier 1, the underground wall 10 installed at a location where the depth to the support layer S is deep is made relatively underground. Bury the wall 10 deeper.

On the other hand, as the depth to the support layer S is shallower, the length of the pile 1c coupled to the footing 1b of the bridge pier 1 becomes shorter.
As the pile 1c of the bridge pier 1 is shorter, the inertial force is small when vibration due to earthquake motion or the like acts on the bridge pier 1, so a relatively small vibration displacement occurs in the bridge pier 1.
Therefore, in order to lower the rigidity of the underground wall 10 installed at a location where the depth to the support layer S is shallow, in order to suitably reduce relatively small vibration displacement generated in the bridge pier 1, the underground Bury wall 10 relatively shallowly.

  By doing this, even if there is a difference in the depth to the support layer S at each installation site of the bridge pier 1, vibration displacement can be suppressed according to the depth to the support layer S, so a plurality of links are connected. It becomes possible to adjust the vibration displacement of the bridge pier 1 to the same degree.

Even in the vibration displacement restraining structure 100 of the structure group having such a configuration, for example, when the sway caused by the earthquake motion acts on the bridge pier 1, the vibration transmission by the pair of underground walls 10 connecting the bridge piers 1. Since the vibration of the bridge pier 1 is attenuated without being amplified, the vibration displacement of the bridge pier 1 can be suppressed.
In particular, in the case of the vibration displacement suppressing structure 100 of the structure group of the third embodiment, since the vibration displacement can be suppressed according to the depth to the support layer S at the location where the bridge pier 1 is installed, The vibration displacement of the bridge pier 1 can be adjusted to the same degree.

  As described above, the vibration displacement suppression structure 100 of the structure group according to the third embodiment can suppress the vibration displacement of the plurality of bridge piers 1 caused by the earthquake motion or the like, and occurs in the bridge girder 2 supported by the bridge piers 1. Problems can be reduced.

Moreover, in the said Embodiment 3, although the underground wall 10 was embed | buried in the depth according to the depth to the support layer S in the installation location of the bridge pier 1, it does not restrict to this.
For example, when the depths to the support layer S are substantially the same, the rigidity of the bridge pier 1 is higher and its posture is stabilized as the number of piles 1c connected to the footing 1b of the bridge pier 1 increases.
And, as the number of the piles 1c of the bridge pier 1 increases, the vibration displacement when the shaking caused by the earthquake motion acts on the bridge pier 1 is smaller. On the other hand, as the number of the piles 1c of the bridge pier 1 is smaller, the vibration displacement at the time when the sway caused by the earthquake motion acts on the bridge pier 1 tends to be larger.
Therefore, in order to suitably reduce relatively large vibration displacement generated in the bridge pier 1, the rigidity of the underground wall 10 is relatively high at the installation site of the bridge pier 1 with a small number of piles 1c (that is, the bridge pier 1 with low rigidity). Installation of the bridge pier 1 with a large number of piles 1c (that is, the bridge pier 1 with high rigidity) in order to embed the underground wall 10 deeper and to suitably reduce relatively small vibration displacement generated in the bridge pier 1 The underground wall 10 may be buried relatively shallowly so as to make the rigidity of the underground wall 10 relatively low in places.
By doing this, even if there is a difference in the rigidity and posture stability of the bridge pier 1, it is possible to suppress the vibration displacement according to the bridge pier 1, so the vibration displacements of the plurality of bridge piers 1 connected are adjusted to the same degree. It becomes possible.

  As described above, the vibration displacement suppressing structure 100 of the structure group of the present embodiment can suppress the vibration displacement of the plurality of bridge piers 1 caused by the earthquake motion etc., and the bridge girder 2 supported by those bridge piers 1 Problems that occur can be reduced.

  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 coupled to the footing 1b is 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.

  In addition, it is needless to say that other specific details and the like can be appropriately changed.

1 Bridge (structure)
DESCRIPTION OF SYMBOLS 1a Pier body 1b Footing 1c Pile 2 Bridge girder 3 地 4 Abutment 10 Underground wall 11 Steel sheet pile 12 Rigid body 20 Connecting member 21 Bearing plate 30 Damping body 100 Vibration displacement restraint structure of structure group S Support layer

Claims (4)

A vibration displacement suppression structure of a group of structures in which a plurality of structures are connected,
A pair of underground walls which extend in a direction in which the plurality of structures extend and which are embedded to a predetermined depth in an arrangement sandwiching the footings of the structures;
A connecting member whose both ends are connected to the pair of underground walls so that the pair of underground walls restrains the footing, and a part of the pair of underground walls is joined to the footing of the structure When,
The vibration displacement suppression structure of a structure group characterized by having. A rigid body is provided at the top of the underground wall,
The vibration displacement suppression structure of a structure group according to claim 1, wherein both ends of the connection member are connected to the rigid body, and the rigid body is joined to a footing of the structure.   The vibration displacement suppressing structure of a group of structures according to claim 1 or 2, wherein the underground wall is buried deeper as a distance between the adjacent structures is longer. The footing of the above-mentioned structure is connected with a pile reaching to the support layer,
The structure group according to any one of claims 1 to 3, wherein the underground wall is embedded deeper as the support layer at the installation site of the structure is deeper. Vibration displacement suppression structure.

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