JP6401983B2 - Column collapse prevention structure - Google Patents

Description

  The present invention relates to a column body collapse prevention structure for preventing a column body from collapsing due to a large-scale earthquake.

In the Great East Japan Earthquake, the occurrence of enormous damage has been reported in which the base (base) of the electric pole that transmits power to the train is destroyed and many electric poles collapse.
In order to prevent the column body from collapsing due to such a large-scale earthquake, a technique for reinforcing the column body by wrapping a steel plate around the base portion of the column body has been proposed (see, for example, Patent Document 1). .)

JP2013-224512A

However, in order to reinforce the column body by the technique of Patent Document 1, a space for performing the work of winding the steel plate around the base portion of the column body is required. Therefore, when there is a structure such as a side wall in the vicinity of the column and the distance between the structure and the column is small, it may be difficult to perform seismic reinforcement by this technique. .
In addition, even if a column that has been seismically reinforced by this technology is spared from collapsing, if a partially damaged column is tilted significantly toward the track side of the train, the column contacts the train. There was a risk of it.

  An object of the present invention is to provide a column body collapse prevention structure capable of preventing the column body from collapsing.

In order to achieve the above object, the present invention provides:
A column body collapse prevention structure that prevents the hollow column bodies provided in pairs at positions facing each other across a predetermined region from collapsing,
A rod-like member that is erected in the hollow portion of the column body and has an outer diameter smaller than the inner diameter of the hollow portion;
A beam member spanned on top of the pair of pillars;
Equipped with a,
The rod-shaped member is erected obliquely with respect to the column body,
The upper end of the rod-shaped member is in contact with the inner surface of the column .

According to the column collapse prevention structure having such a configuration, for example, even when the base portion of the column body is destroyed due to a large-scale earthquake or the like, the column body leans against the rod-like member standing in the hollow portion. Since it is supported by the rod-shaped member, the column body can be prevented from collapsing to a predetermined region side. For example, if a metal rod-like member is used, the leaning column can be supported even if the rod is bent slightly due to the weight of the column, so that the column can be prevented from collapsing.
In particular, the beam members spanned between the pair of column bodies make it difficult for the pair of column bodies to approach each other. There is no further tilting, and the columnar body can be prevented from coming into contact with equipment or structures on the region side.
In addition, if the upper end of the rod-like member that stands upright with respect to the column body is in contact with the inner surface of the column body, vibrations and deformations that occur in the column body due to the shaking of the earthquake can be reduced. , Column damage can be reduced.

Also, preferably
The upper end portion of the rod-shaped member is formed in a rounded shape.
If the upper end of the rod-shaped member is rounded, the portion where the upper end of the rod-shaped member is in contact with the inner surface of the column will not be damaged. In other words, by rounding the upper end of the rod-shaped member to make it round, the rod-shaped member does not damage the inner surface of the column body as a starting point of destruction.
Specifically, the upper end is rounded at the upper end portion even when the rod-like member functions like a stick by placing the rod-like member diagonally with the inner surface of the column abutting. If it is a shape, the deformation | transformation of a column will not be restrained excessively in the position where the upper end part is contact | abutting, and the contact position will not become a starting point of destruction of a column.

Also, preferably
The rod-shaped member is a member in which a plurality of steel materials are bundled and restrained in a rod shape,
The rod-shaped member has a filler made of mortar or concrete filled in a gap between the bundles of the plurality of steel materials.
If it is a rod-shaped member formed by bundling a plurality of steel materials, the thickness, strength and rigidity of the rod-shaped member can be adjusted according to the diameter and number of the steel materials to be bundled.
Moreover, the rod-shaped member of the structure which put the bundle | flux of several steel materials in the steel pipe may be sufficient.
For example, a rod-shaped member having a structure in which mortar or concrete is filled in a gap between a plurality of steel material bundles, or a bar-shaped member having a structure in which mortar or concrete is filled in a gap between steel material bundles after a plurality of steel material bundles are placed in a steel pipe. Such a rod-shaped member made of reinforced concrete (manufactured by RC) can suitably prevent the column body from collapsing.

Also, preferably
The rod-shaped member has a length of one quarter or more and two thirds or less of the column body.
In addition, it is preferable that the length of a rod-shaped member is about 1/3 of a column.
If the rod-shaped member is about one third of the length of the column, even if the column whose base has been destroyed leans against the rod-shaped member, it supports the column so that it does not tilt any further. can do.

  ADVANTAGE OF THE INVENTION According to this invention, the column body collapse prevention structure which can prevent that a column body collapses is obtained.

It is a front view which shows the column body collapse prevention structure of this embodiment. It is explanatory drawing which expands and shows the vicinity of the rod-shaped member of a column body collapse prevention structure. It is explanatory drawing which shows the principal part of the column body collapse prevention structure in the state by which the column body was destroyed. It is explanatory drawing which shows the modification of a column body collapse prevention structure. It is explanatory drawing which shows the modification of a column body collapse prevention structure. It is explanatory drawing which shows the modification of a column body collapse prevention structure, and is an enlarged view (a) of the rod-shaped member vicinity, and sectional drawing (b) of the rod-shaped member. It is explanatory drawing which shows the modification of a column body collapse prevention structure.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a column body collapse prevention structure according to the present invention will be described in detail with reference to the drawings. However, the embodiments described below are given various technically preferable limitations for carrying out the present invention, but the scope of the present invention is not limited to the following embodiments and illustrated examples.

  FIG. 1 is a front view showing a column body collapse prevention structure 100. This column body collapse prevention structure 100 is intended to prevent the collapse of the hollow column body 1 provided in pairs at positions facing each other across the track R of the train on the viaduct P.

The column 1 is fixed in a vertical direction at a predetermined position on both sides of the viaduct P with its lower part embedded in the viaduct P. In the vicinity of the column 1, a side wall W is provided.
The column 1 standing on the viaduct P is a so-called electrification column, and a bracket 2 for supporting feeders and trolley wires for supplying power to the train is fixed to the upper portion of the column 1 by a fixing band 2a. ing. The bracket 2 may be fixed to the column 1 by other fixing means that is not a band structure.
This column 1 is a concrete column having a substantially cylindrical shape using a steel material 1c (see FIG. 3) as a framework, and has a hollow portion 1a penetrating in the longitudinal direction.

  As shown in FIGS. 1 and 2, the column collapse prevention structure 100 according to the present embodiment is stretched over a rod-like member 10 erected in the hollow portion 1 a of the column 1 and the top of the column 1. And a beam member 20.

The rod-shaped member 10 is, for example, a metal core material having a cylindrical shape, and is erected in a vertical posture in the hollow portion 1a.
Specifically, the rod-shaped member 10 is formed by pouring a solidified material such as mortar around the rod-shaped member 10 inserted vertically into the bottom portion of the hollow portion 1a, so that the rod-shaped member 10 is a base portion (root) of the columnar body 1. ).
Since this rod-shaped member 10 is a columnar core material whose outer diameter is smaller than the inner diameter of the hollow portion 1 a of the column body 1, it can be easily inserted into the column body 1.
In addition, since the internal diameter of the hollow part 1a of the column 1 is generally about 230-260 mm, as the rod-shaped member 10, a round steel having a diameter of about 130-160 mm can be used.
The rod-shaped member 10 has a size that is longer than a quarter of the length of the column 1 and shorter than two-thirds, for example. The rod-shaped member 10 of the present embodiment has a length that is one-third of the column 1.

The rod-shaped member 10 is inserted into the hollow portion 1a from the upper opening of the column 1 opened by removing the lid 1b of the column 1 in a posture suspended by a crane or the like.
The fixing member 11 is formed by pouring a predetermined amount of a solidifying material from a small hole (not shown) formed in the lower side surface of the column 1 and curing it.
It should be noted that a small hole (not shown) formed on the side surface of the column body 1 is used for pouring the solidified material, the state in the hollow portion 1a before the column body 1 is inserted, and the column body 1 is inserted and solidified. The state before the material is poured in, the state after the solidified material is cured and the fixing member 11 is formed, and the like can be confirmed by the fiberscope.

The beam member 20 is a long member made of, for example, steel having a length extending between the pair of column bodies 1 and is positioned above the bracket 2 in the column body 1 by a beam fixture 20a. It is attached.
Since the beam member 20 is stretched over the opposing column 1, the moment generated in the column 1 due to the shaking of the earthquake can be reduced.
The shape of the beam member 20 is arbitrary, and may be plate-shaped, rod-shaped, or tubular. However, when the large-scale earthquake occurs, the beam member 20 bends and the earthquake Accordingly, the thickness and thickness are designed so that the strain generated in the column 1 can be released. That is, before the column body 1 is damaged due to the shaking of a large-scale earthquake, the beam member 20 is bent to release the distortion of the column body 1, thereby making it possible to minimize damage to the column body 1.

  Next, the effect of preventing the column body 1 from being collapsed by the column body collapse preventing structure 100 will be described.

Since the base portion of the column 1 fixed to the viaduct P is a fulcrum for standing the column 1, the strain generated in the column 1 due to the shaking of the earthquake tends to concentrate on the base portion of the column 1. It has become.
Therefore, when a large-scale earthquake occurs, as shown in FIG. 3, the base part of the column 1 may be destroyed.

As shown in FIG. 3, the column 1 in which the concrete portion of the foundation has been crushed comes to lean against the rod-shaped member 10.
Since the rod-like member 10 erected in the hollow portion 1a of the column body 1 has a length that is one third of that of the column body 1, the column body 1 whose base portion has been destroyed approaches. Even if it is hung, the rod-shaped member 10 can be supported so that the column body 1 does not tilt further.

In addition, when the length of the rod-shaped member 10 exceeds two-thirds of the length of the column 1, the rod-shaped member 10 may be bent by an earthquake shake. This is because the range in which the column body 1 swings due to the earthquake is larger in the upper part of the column body 1, so that if the rod-shaped member 10 is long, it is pushed by the greatly bent column body 1. If the rod-shaped member 10 is bent, the inclination of the column body 1 leaning on the rod-shaped member 10 is not preferable. In addition, when the length of the rod-shaped member 10 exceeds two-thirds of the length of the column 1, a joint is necessary or the weight thereof is increased. This is not preferable because the workability to be inserted into the housing is deteriorated.
Moreover, if the rod-shaped member 10 has at least a quarter length of the column 1, the leaning column 1 can be supported.
Therefore, the length of the rod-shaped member 10 is preferably longer than a quarter of the length of the column 1 and shorter than two-thirds. Further, the length of the rod-shaped member 10 is more preferably shorter than one half of the length of the column 1, and more preferably about one third of the length of the column 1.
More specifically, the length of the rod-shaped member 10 is preferably about one third of the column 1 with a length above the ground, for example, about 3 m from the ground. Just do it.

In addition, since the beam member 20 is bridged between the pair of column bodies 1, even if the beam member 20 is slightly bent due to the shaking of a large-scale earthquake, the column bodies 1 are difficult to approach each other. Therefore, the distance between the pillars 1 can be maintained.
That is, even when the column body 1 leans against the rod-shaped member 10, the distance between the paired column bodies 1 is maintained by the beam member 20, so that the column body 1 tilts further toward the track R side. The column body 1 is not in contact with the train on the track R.

As described above, the column collapse prevention structure 100 according to the present embodiment is erected in the hollow portion 1a of the column 1 even when the foundation of the column 1 is destroyed due to a large-scale earthquake or the like. Since the columnar member 1 is supported by the rod-shaped member 10 that is provided, the columnar member 1 can be prevented from collapsing on the track R.
In particular, the beam member 20 spanned between the paired column bodies 1 prevents the column body 1 from being greatly inclined toward the track R side, and thus is supported in a state leaning against the rod-shaped member 10. It can prevent that the column 1 contacts the train on the track R.

For example, there is an attempt to prevent the column body 1 from collapsing with only the rod-shaped member 10, but since the eccentric load due to the bracket 2 or the overhead wire is acting on the column body 1, the rod-shaped member 10 is broken at the tip side. It has been found that when the later column 1 is ridden, the rod-shaped member 10 is deformed only by the rod-shaped member 10 and the tilt of the column 1 progresses and may contact the train. In order to avoid this, the inventors have come up with the present technology that uses the beam member 20 in combination.
In addition, the moment which generate | occur | produces in the column 1 can be made small by connecting the column 1 with the beam member 20, and the column 1 becomes difficult to break.
In addition, by connecting the column bodies 1 with the beam members 20, the eccentric load due to the bracket 2 can be eliminated, and the column bodies 1 are unlikely to get on the rod-shaped member 10. Further, by connecting the column bodies 1 with the beam members 20, the displacement at the time of destruction of the column bodies 1 can be reduced, and the column bodies 1 are difficult to get on the rod-shaped member 10. By avoiding a situation in which the column body 1 rides on the rod-shaped member 10, the deformation of the rod-shaped member 10 does not proceed, and the tilt of the column body 1 does not proceed. On the other hand, when the column 1 is put on the rod-shaped member 10, the vibration of the column 1 is directly transmitted to the rod-shaped member 10, so that the deformation of the rod-shaped member 10 is not preferable.

  As described above, in this column body collapse prevention structure 100, the hollow column body 1 standing in a pair at positions facing each other across the track R that is a predetermined region is on the track R. Therefore, it is possible to ensure the safety of the train on the track R when a large-scale earthquake occurs.

The present invention is not limited to the above embodiment.
For example, as shown in FIG. 4, the rod-shaped member 10 may be erected in the hollow portion 1 a of the column body 1 in such a posture or arrangement that the upper end portion 10 a of the rod-shaped member 10 contacts the inner surface of the column body 1. .
In particular, the upper end portion 10a of the rod-shaped member 10 is formed in a rounded shape with a corner, and has a tip formed in, for example, a hemispherical shape.
As described above, if the upper end portion 10a of the rod-shaped member 10 is in contact with the inner surface of the column body 1, the vibration and deformation generated in the column body 1 due to the shaking of the earthquake can be reduced, and the column body 1 is damaged. Can be reduced.
Moreover, since the upper end part 10a of the rod-shaped member 10 that contacts the inner surface of the column body 1 is rounded, the portion where the rod-shaped member 10 abuts may be damaged, or the column body 1 may be deformed at the contact portion. Is not overly restrained. That is, by making a rounded shape by removing the corner of the upper end portion 10a of the rod-shaped member 10, the rod-shaped member 10 may damage the inner surface of the column body 1 as a starting point of destruction, or excessively I try not to be restrained.

Further, as shown in FIG. 5, a spacer 12 that contacts the inner surface of the column 1 may be attached to the rod-shaped member 10.
The spacer 12 is an annular member made of hard rubber, for example, and is attached to the distal end side of the rod-shaped member 10.
Thus, if the spacer 12 is attached to the front end side of the rod-shaped member 10 and the spacer 12 is in contact with the inner surface of the column 1, the vibration or deformation that occurs in the column 1 due to the shaking of the earthquake is prevented. It can be made small and damage to the column 1 can be reduced.

Moreover, as shown to Fig.6 (a) (b), the rod-shaped member 10 formed by bundling the several steel materials 15 and restraining in the shape of a rod may be sufficient.
The rod-shaped member 10 is formed by, for example, packing 19 steel materials 15 having a diameter of 25 mm into a steel pipe 16 having an inner diameter of 140 mm. Each steel material 15 is fixed to the upper and lower portions of the steel pipe 16 by spot welding.
Further, the gap between the bundles of the plurality of steel materials 15 is filled with a filler 17 such as mortar or concrete. That is, here, a rod-shaped member 10 made of reinforced concrete (manufactured by RC) such as a steel plate-wound RC member is used.
If it is the rod-shaped member 10 formed by bundling such a plurality of steel materials 15, the thickness and rigidity of the rod-shaped member 10 can be adjusted according to the diameter and number of the steel materials 15 to be bundled. It is possible to construct the column body collapse prevention structure 100 using the rod-shaped member 10 corresponding to the weight of the column body 1.

Further, as shown in FIG. 7, a column body collapse prevention structure 100 having a structure in which the fixing member 11 is not disposed and the base portion of the rod-shaped member 10 is not fixed may be used.
As long as the rod-like member 10 can stand up in the hollow portion 1a and can support the pillar body 1 whose base portion is broken, the column body collapse prevention structure 100 having the structure in which the fixing member 11 is not disposed is provided. The column body 1 can be prevented from collapsing on the track R.

  In the above embodiment, the predetermined region is the train track R, and the column collapse prevention structure 100 that prevents the collapse of the column 1 sandwiching the train track R has been described as an example. The present invention is not limited to this, and the column body collapse prevention structure 100 is applied to the column body 1 sandwiching a road or a park as a predetermined area so as to prevent collapse due to an earthquake. Also good.

  In the above embodiment, the upper end portion 10a of the rod-shaped member 10 is cut and polished to round the upper end portion 10a into a hemispherical shape. However, the present invention is not limited to this. Alternatively, for example, the upper end portion of the rod-shaped member 10 may be covered with a rounded spacer so that the portion where the rod-shaped member 10 abuts is not damaged.

  In addition, it is needless to say that other specific detailed structures can be appropriately changed.

DESCRIPTION OF SYMBOLS 1 Column 1a Hollow part 2 Bracket 10 Bar-shaped member 10a Upper end part 11 Fixing member 12 Spacer 15 Steel material 16 Steel pipe 17 Filler 20 Beam member 100 Column body collapse prevention structure R Track P Viaduct

Claims (3)

A column body collapse prevention structure that prevents the hollow column bodies provided in pairs at positions facing each other across a predetermined region from collapsing,
A rod-like member erected in the hollow portion of the column,
A beam member spanned on top of the pair of pillars;
Equipped with a,
The rod-shaped member is erected obliquely with respect to the column body,
A column body collapse prevention structure , wherein an upper end portion of the rod-shaped member is in contact with an inner surface of the column body. The columnar body collapse prevention structure according to claim 1 , wherein an upper end portion of the rod-shaped member is formed in a rounded shape. The bar member state, and are not a plurality of steel is constrained to be in the rod-like bundle,
3. The column collapse prevention structure according to claim 1 , wherein the rod-shaped member has a filler made of mortar or concrete filled in a gap between the bundles of the plurality of steel materials .

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