JP2005009211A - Structure supporting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure supporting structure having simple construction giving no trouble with maintenance when used in a cold area. <P>SOLUTION: A bridge has a bridge beam portion (an upper work) 10 and bridge pier portions (lower works) 12. The bridge beam portion 10 is formed planarly slender. The bridge pier portions 12 are provided at both ends of the bridge beam 10 in the longitudinal direction for supporting it upward. Between a setting face 14 of the bridge beam portion 10 and a seating face 16 of the bridge pier portion 12, a magnetic levitation device 18 is mounted for floating and separating the bridge beam portion 10 upward from the bridge pier portion 12 with the repulsion of electromagnetic force. The levitation device 18 has a permanent magnet 18a installed on the setting face 14, an electromagnet 18b installed on the seating face 16, and a controller 18c connected to the electromagnet 18b. To the controller 18c, a vibration sensor 20 is connected for supplying electric power to a coil 181b to drive the electromagnet 18b when a value detected by the vibration sensor 20 is a preset value or greater. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a support structure for a structure, and more particularly, to a support structure for a planar and elongated superstructure such as a bridge girder.
[0002]
[Prior art]
Considering the shape of artificial ground and foundations of buildings with a large planar scale and a small aspect ratio, there is a risk of deviating from substructures that support them from below, even if there is a certain degree of shaking during an earthquake. There is little sex.
[0003]
However, the superstructure such as a long and narrow bridge girder has a high risk of falling off from the substructure that supports it under the both ends in the longitudinal direction due to shaking during an earthquake. Patent Document 1 proposes a structure receiving device used as a bridge structure receiving device in order to avoid such a risk.
[0004]
The receiving device disclosed in Patent Document 1 includes an upper work and a lower work that supports the upper work, and forms a plurality of elongated lubricating oil passages on the receiving surface of the lower work, and is provided at both ends of the passage. The lubricating oil is supplied and discharged from the opening.
[0005]
If the receiving device configured in this way is interposed between the superstructure and the substructure that supports it, the vibration will not be transmitted to the superstructure side against the vibration at the time of earthquake, so deviate from the substructure, The risk of falling down can be reduced.
[0006]
However, the receiving device having such a structure has the following problems.
[0007]
[Patent Document 1]
JP-A-60-219309 [0008]
[Problems to be solved by the invention]
In other words, the receiving device disclosed in Patent Document 1 forms a plurality of passages for lubricating oil, so that the structure of the receiving surface of the substructure becomes complicated, and this is used for, for example, a viaduct in a cold district. In this case, there has been a problem in terms of maintenance when the passage is closed due to freezing of the lubricating oil or the inclusion of foreign matter.
[0009]
The present invention has been made in view of such conventional problems, and the object of the present invention is a structure that has a simple structure and has no problem in terms of maintenance even when used in a cold region. It is to provide a support structure.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a structure for supporting a superstructure such as a bridge girder by a substructure provided below both ends. A magnetic levitation device for interposing the upper work upward and away from the lower work due to the repulsion of electromagnetic force between the lower surface and the seat surface of the sub work, and vibration of the ground on which the lower work is supported The magnetic levitation device is driven when the vibration sensor to be detected detects a predetermined or greater earthquake motion.
[0011]
According to the structure support structure configured as described above, the magnetic levitation device that floats and separates the upper work upward from the lower work between the pedestal surface of the upper work and the stool face of the lower work facing each other. The vibration sensor that detects the vibration of the ground where the substructure is installed drives the magnetic levitation device when it detects seismic motion above a predetermined level. The upper work is separated from the lower work by driving, and vibration is not transmitted to the super work.
[0012]
In this case, the magnetic levitation device lifts and separates the upper work upward from the lower work due to the repulsion of electromagnetic force. Therefore, even if it is installed in a cold region, there is no influence of the surrounding environment and almost no maintenance is required.
[0013]
The magnetic levitation device comprises: a permanent magnet installed on either the pedestal surface or the scorpion surface; and an electromagnet installed on either the pedestal surface or the stool surface and facing the permanent magnet. Can be configured.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings. 1 to 3 show an embodiment of a structure support structure according to the present invention. The support structure shown in these drawings illustrates the case where the present invention is applied to a support portion of a bridge.
[0015]
The bridge to which the support structure of this embodiment is applied includes a bridge girder part (upper work) 10 and a pier part (lower work) 12. The bridge girder part (upper work) 10 is formed in an elongated shape in plan view.
[0016]
The lower end side of the pier part (under construction) 12 is embedded in the ground, and a plurality of the bridge piers (undercarriage) 12 are supported upright on the ground at a predetermined interval. A plurality of bridge piers (lower works) 12 are arranged at both ends in the longitudinal direction of the bridge girder part (upper work) 10 and support the bridge girder part (upper work) 10 from below.
[0017]
A pedestal surface 14 is provided on the lower surface of each bridge girder part (upper work) 10. In the case of the present embodiment, the pedestal surface 14 is formed in a thin step shape by notching the bottom surfaces of both ends of each bridge girder part (upper work) 10.
[0018]
On the upper surface side of the pier part (under construction) 12, a saddle seat surface 16 is provided so as to face the pedestal surface. In the case of the present embodiment, a pair of pedestal surfaces 14 are opposed to the saddle seat surface 16 of one pier part (under construction) 12. The basic configuration of such a bridge is the same as that of the conventional one, but the present embodiment has the following remarkable features.
[0019]
That is, in the case of the present embodiment, the bridge girder is repelled between the pedestal surface 14 of the bridge girder part (upper work) 10 and the saddle face 16 of the pier part (lower work) 12 due to the repulsion of electromagnetic force. A magnetic levitation device 18 is interposed to lift and separate the part (upper work) 10 from the pier (lower work) 12 upward.
[0020]
Magnetic levitation devices 18 having the same configuration are arranged at both ends of each bridge girder part (superstructure) 10. FIG. 3 shows details of the magnetic levitation device 18. The magnetic levitation apparatus 18 shown in FIG. 3 includes a permanent magnet 18a installed on the seat surface 14, an electromagnet 18b installed on the seat surface 16, and a controller 18c connected to the electromagnet 18b.
[0021]
The permanent magnet 18 a is formed in a flat plate shape, and is fixed to the lower surface of the convex mounting base 18 d, and the mounting base 18 d is bonded and fixed to the lower surface of the pedestal surface 14. The permanent magnet 18a is magnetized so that, for example, the lower surface is an N pole and the upper surface is an S pole. The electromagnet 18b is fixed to the seat surface 16 so as to face the permanent magnet 18a.
[0022]
The electromagnet 18b includes a winding core portion 180b that contacts the permanent magnet 18a and a coil 181b. When DC power is supplied from the controller 18c, a magnetic field is formed in which the upper surface is an N pole and the lower surface is an S pole. Is done.
[0023]
The controller 18c is connected to a vibration sensor 20 installed in the ground on which the pier part (undercarriage) 12 is supported. When the detection value of the vibration sensor 20 is a predetermined value or more, the coil 181b is used. Is supplied with electric power to drive the electromagnet 18b.
[0024]
In the bridge support structure configured as described above, in a steady state, the magnetism interposed between the pedestal surface 14 of the bridge girder part (upper work) 10 and the bearing surface 16 of the bridge pier part (lower work) 12. In the levitation device 18, the permanent magnet 18 a and the core portion 180 b of the electromagnet 18 a are in contact with each other, and the bridge pier (lower work) 12 supports the bridge girder (upper work) 10.
[0025]
When an earthquake occurs and the vibration is greater than a predetermined value, DC power is supplied from the controller 18c to the coil 181b of the electromagnet 18b, and the electromagnet 18b is driven.
[0026]
When DC power is supplied to the coil 181b of the electromagnet 18b, a magnetic field is formed in which the upper surface side of the electromagnet 18b is an N pole, and the lower surface side is an S pole. By this repulsive force, the bridge girder part (upper work) 10 is lifted and separated upward from the pier part (lower work) 12.
[0027]
Now, according to the support structure configured as described above, between the pedestal surface 14 of the bridge girder part (upper work) 10 and the saddle face 16 of the bridge pier part (lower work) 12, the bridge girder part ( A vibration sensor 20 for detecting the vibration of the ground on which the pier part (substructure) 12 is supported by interposing a magnetic levitation device 18 that floats and separates the upper pier 10 from the pier part (substructure) 12 upward, The magnetic levitation device 18 is driven when a seismic motion of a predetermined level or more is detected. Therefore, when a seismic motion of a predetermined level or more occurs, the bridge girder (upper work) 10 is moved from the pier part (lower work) 12 by driving the magnetic levitation device 18. It separates and vibration is no longer transmitted to the bridge girder part (superstructure) 10, thereby protecting the bridge girder part (superstructure) 10 from earthquake motion.
[0028]
In this case, the magnetic levitation device 18 floats and separates the bridge girder part (upper work) 10 upward from the pier part (lower work) 12 due to the repulsion of electromagnetic force. There is no need for maintenance.
[0029]
In the case of the present embodiment, the method of entering the inertial force of the bridge girder part (upper work) 10 can be reduced as much as possible at the time of the earthquake, so the horizontal force acting on the pier part (lower work) 12 is relatively small. Can be a small basis.
[0030]
In the above embodiment, the case where the permanent magnet 18a is arranged on the pedestal surface 14 side of the bridge girder part (upper work) 10 and the electromagnet 18b is arranged on the saddle face 16 of the bridge pier part (lower work) 12 is exemplified. However, the embodiment of the present invention is not limited to this, and these arrangements may be reversed.
[0031]
Further, the permanent magnet 18a can be replaced with the electromagnet 18b. Furthermore, in the said Example, although the application example in the case of supporting the elongate bridge girder part 10 with the pier part 12 as an example of a structure was shown, implementation of this invention is not limited to this, If it is the structure which supports the both ends of the longitudinal direction of the superstructure which is elongate planarly, it can be applied also to the artificial ground and the foundation of a building with a small aspect ratio.
[0032]
【The invention's effect】
As described above in detail, according to the structure support structure of the present invention, the structure is simple and there is no problem in terms of maintenance even when used in a cold region.
[Brief description of the drawings]
FIG. 1 is a top view when a structure support structure according to the present invention is applied to a bridge.
FIG. 2 is a side view of FIG.
FIG. 3 is an enlarged view of a main part of FIG. 2;
[Explanation of symbols]
10 Bridge girder (superstructure)
12 Bridge Pier (Substructure)
14 Base surface 16 Saddle surface 18 Magnetic levitation device 18a Permanent magnet 18b Electromagnet 18c Controller 20 Vibration sensor

Claims (2)

In the support structure of the structure that supports the superstructure such as the bridge girder with the substructure provided below both ends,
Between the pedestal surface of the upper work and the saddle face of the lower work facing each other, a magnetic levitation device is installed to lift and separate the upper work upward from the lower work by repulsion of electromagnetic force,
A structure supporting structure, wherein a vibration sensor for detecting vibration of a ground on which the substructure is supported drives the magnetic levitation device when detecting a seismic motion of a predetermined level or more. The magnetic levitation device comprises: a permanent magnet installed on one of the pedestal surface or the stool surface; and an electromagnet installed on either the pedestal surface or the stool surface and facing the permanent magnet. The structure support structure according to claim 2, wherein the structure support structure is provided.

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