JP7118677B2 - Column base reinforcement structure - Google Patents

Description

The present invention relates to a pedestal reinforcing structure for reinforcing a pedestal of a pillar.

Conventionally, in order to reinforce existing structures against earthquakes, reinforcing metal fittings having a horizontal plate, a vertical plate, and a slanting plate and having a substantially right-angled triangular shape when viewed from the side are installed at the column bases of the columns of the structure. , a seismic reinforcing structure is known in which anchors are further hammered in using the reinforcing metal fittings (see, for example, Patent Document 1).

JP-A-10-331437

However, in the case of the reinforced structure of Patent Literature 1, the movement of the column base is restricted by reinforcement with the additional anchors, and it is possible to prevent the column base fixed to the concrete frame or the like from shifting in the horizontal direction. However, when the pillars flex greatly due to the shaking of a relatively large earthquake, the anchor part cannot follow the deformation and is damaged, and the function of the reinforcing structure is sometimes impaired.

SUMMARY OF THE INVENTION An object of the present invention is to provide a pedestal reinforcing structure capable of suitably reinforcing the pedestal of a pillar.

In order to achieve the above object, the present invention
A column base reinforcing structure comprising a rectangular plate-shaped base plate and a column body erected on the upper surface of the base plate, the base plate reinforcing a column base portion of the column fixed on a predetermined skeleton, ,
an extension base plate member that abuts on an end face of one side of the base plate and a range covering a part of the end faces of both sides of the one side and is fixed to the frame;
At a position along the edge of the additional base plate member that abuts on the one side of the base plate, with one surface facing the pillar body , there is a gap between the pillar body and the pillar body. a plate-shaped member erected in a spaced apart arrangement;
a bolt member that fastens the plate member to the column body;
was prepared.

In the column base reinforcing structure having such a configuration, the extension base plate member abuts on one side of the base plate of the column and the end face of the range covering part of both sides of the one side, and the bolt member is attached to the column body of the column. The plate-shaped member is fastened via the . At this time, the base plate of the column is placed between the end pieces of the additional base plate member.

Then, for example, when an earthquake swaying along one side of the base plate acts on the column, the additional base plate member in contact with the base plate of the column will restrict the movement of the base plate part due to the swaying. As a result, it is possible to prevent the column base portion of the column from being displaced in the horizontal direction and prevent the column base portion of the column from being damaged.
Also, for example, if an earthquake swaying in a direction that intersects one side of the base plate acts on the column, the swaying of the base plate of the column in the direction toward the additional base plate member (the direction in which the column body approaches the plate member) sway), the additional base plate member that is in contact with the base plate of the pillar restricts the movement of the base plate part due to the sway, thereby preventing the pillar base from being displaced in the horizontal direction. It is possible to prevent the column base from being damaged.
In addition, for example, when the sway of an earthquake in the direction intersecting one side of the base plate acts on the pillar, the sway in the direction in which the pillar body of the pillar separates from the plate member is coupled via the bolt member. Vibrational energy is absorbed by the deformation of the plate-shaped member, and damage to the column base portion of the column can be prevented.

In this way, with this column base reinforcement structure, the column base portion of the column can be suitably reinforced rather than simply hammering in more anchors. It is possible to prevent the column base from being damaged.
In particular, since this column base reinforcement structure is designed to be attached to one side of the column to be reinforced, even if the column is embedded in the existing wall, one side of the column and one of the columns on both sides of that side If the portion is exposed on the front side of the wall, the column base portion of the column can be reinforced by installing the column base reinforcing structure on the column.

Also preferably:
Rib-shaped members erected on the additional base plate member are integrally provided on both sides of the plate-shaped member,
The pair of rib-shaped members are arranged to face each other so as to sandwich a portion of the column.

Since the rib-like members are provided on both sides of the plate-like member to improve the rigidity of the plate-like member, the column base portion of the column can be suitably reinforced by this column base reinforcing structure so as not to be damaged.

Also preferably:
The bolt member is inserted through a vertically elongated hole formed in the plate-like member and fastened to the column body. and a posture switching member is interposed to enable switching of a posture in which the end portion of the bolt member moves up and down.

If the bolt member that fastens the plate-like member to the column main body can change the posture by moving the end portion up and down by the interposed posture switching member, for example, one side of the base plate When the sway of an earthquake in the direction that crosses the It is designed to switch.
By switching the posture of the bolt member in this way, it becomes difficult for a bending moment to act on the bolt member, making it difficult for the bolt member to break.
The bolt member may be inserted through a loose hole formed in the plate member and fastened to the column body. In this case as well, the posture of the bolt member is similarly switched, making it difficult for the bending moment to act on the bolt member, making it difficult for the bolt member to break.

On the other hand, for example, if the bolt member that fastens the plate-shaped member to the column body is firmly fastened so that there is no play that changes its posture, if the column tilts due to the shaking of an earthquake, This is not preferable because a bending moment acts on the bolt member, and the bolt member, which is weak against shear force, may break.

ADVANTAGE OF THE INVENTION According to this invention, the column base of a column can be reinforced suitably.

It is the perspective view (a) which shows the column base reinforcement structure of Embodiment 1, and a top view (b). 4 is a perspective view showing a reinforcing metal fitting used in the column base reinforcing structure of Embodiment 1. FIG. It is the perspective view (a) which shows the column base reinforcement structure of Embodiment 2, and a top view (b). FIG. 9 is a perspective view showing a reinforcing metal fitting used in the column base reinforcing structure of Embodiment 2; A perspective view (a) showing the pedestal reinforcing structure of Embodiment 3, a perspective view (b) showing a posture switching member used in the pedestal reinforcing structure, and an explanatory diagram (c) relating to the function of the pedestal reinforcing structure. be. A perspective view (a) showing a modification of the column pedestal reinforcing structure of Embodiment 3, a perspective view (b) showing a posture switching member used in the pedestal reinforcing structure, and an explanatory diagram ( c). A perspective view (a) showing a modification of the column pedestal reinforcing structure of Embodiment 3, a perspective view (b) showing a posture switching member used in the pedestal reinforcing structure, and an explanatory diagram ( c). A perspective view (a) showing a modification of the column pedestal reinforcing structure of Embodiment 3, a perspective view (b) showing a posture switching member used in the pedestal reinforcing structure, and an explanatory diagram ( c). It is an explanatory view showing the upper house of the platform.

EMBODIMENT OF THE INVENTION Hereinafter, with reference to drawings, embodiment of the column base reinforcement structure which concerns on this invention is described in detail. However, although various technically preferable limitations are attached to the embodiments described below in order to carry out the present invention, the scope of the present invention is not limited to the following embodiments and illustrated examples.

In this embodiment, for example, as shown in FIG. 9, a column base reinforcement structure for reinforcing a column 1 of a roof R of a platform P of an elevated station will be described as an example.
As shown in FIG. 9, the pillar 1 of the upper house R is erected on the platform girder 5 that constitutes the platform P. As shown in FIG.
The platform girder 5 is a frame made of reinforced concrete. A concrete platform slab (not shown) is provided on the platform girder 5 to enable walking on the platform P.
As shown in FIGS. 1(a) and 1(b), the pillar 1 includes a rectangular base plate 3 and a pillar body 2 erected on the upper surface of the base plate 3. As shown in FIGS.
The lower end of the column body 2 is welded to the upper surface of the base plate 3, the base plate 3 is fixed to the platform girder 5 with the column fixing anchor bolt 4, and the column 1 is fixed on the platform girder 5. .
Note that the column body 2 in this embodiment is located inside the outer edge of the base plate 3 and has a smaller outer size (contour) than the base plate 3 when viewed from above.
In this embodiment, H-shaped steel is used as the column body 2 .

The pedestal reinforcement structure 100 of this embodiment is for reinforcing the pedestal of a pillar where the base plate 3 portion of the pillar 1 is fixed on a predetermined skeleton (here, the platform girder 5).

(Embodiment 1)
For example, as shown in FIGS. 1(a), 1(b), and 2, the column base reinforcing structure 100 of Embodiment 1 is configured such that one side of the base plate 3 of the column 1 is partially surrounded by the base plate 3. , and the extension base plate member 10 fixed to the platform girder 5 and one side of the base plate 3. A plate-like member 20 erected at a position along the edge of the extension base plate member 10 with one surface facing the pillar body 2, and a bolt member 30 fastening the plate-like member 20 to the pillar body 2. etc.

In other words, this column base reinforcing structure 100 has a reinforcing metal fitting 50 composed of an extension base plate member 10 and a plate-like member 20, and the extension base plate member 10 of the reinforcement metal fitting 50 is fixed to the platform girder 5. By fixing the plate member 20 of the reinforcing metal fitting 50 to the column main body 2, the column base of the column 1 is reinforced.

The extension base plate member 10 is a member made of, for example, a steel plate, and is provided with a substantially U-shaped notch 10 a corresponding to the planar shape of the base plate 3 of the column 1 .
The additional base plate member 10 is brought into contact with the base plate 3 by fitting the substantially U-shaped notch 10 a to one side of the base plate 3 .
In other words, the additional base plate member 10 is brought into contact with the base plate 3 so that the plate end pieces 10b on both sides of the substantially U-shaped notch 10a sandwich a part of the base plate 3. As shown in FIG.
In this way, the end face of the substantially U-shaped notch 10a portion of the additional base plate member 10 is brought into contact with the end face of the range covering one side of the base plate 3 and a part of both sides of the one side, and the base plate 3, a reinforcing metal fitting 50 is assembled.
If there is a gap between the plate end piece 10b and the base plate 3, it is preferable to eliminate looseness by driving a wedge member into the gap.

Further, the extension base plate member 10 is provided with a bolt hole 10c, and the anchor bolt 11 is embedded in the platform girder 5 through the bolt hole 10c to fix the extension base plate member 10 (reinforcement metal fitting 50) to the platform girder 5. ing.

The plate member 20 is, for example, a member made of a steel plate and having bending ductility (plastic deformability), and is welded to the upper surface of the additional base plate member 10 .
Specifically, the plate-like member 20 is welded to the upper surface of the extension base plate member 10 along the edge of the center side of the substantially U-shaped notch 10a. It is set up facing the
A bolt hole 20a is provided in the plate-like member 20, and the bolt member 30 is fastened to the column body 2 (here, a flange of H-shaped steel) through the bolt hole 20a, and the plate-like member 20 ( A reinforcing metal fitting (50) is fixed to the column body (2).

The bolt holes 20a of the plate member 20 are preferably loose holes. If the bolt hole 20a of the plate-like member 20 is formed in a slightly larger hole (loose hole), the bolt member 30 that fastens the plate-like member 20 to the column body 2 has some play. A bending moment is less likely to act on 30 .
For example, if the bolt member 30 that fastens the plate-shaped member 20 to the column body 2 is firmly fastened so that there is no play that changes its posture, when the column 1 tilts due to the shaking of an earthquake, that A bending moment acts on the bolt member 30, and the bolt member 30, which is weak against shearing force, may break, which is not preferable.

The bolt member 30 is a member fastened to the column body 2 through the bolt hole 20a of the plate member 20, and a nut member 31 is screwed to the tip of the bolt member 30 on the column body 2 side.
Alternatively, the bolt member 30 may be attached from the column body 2 side, and the nut member 31 may be attached to the plate member 20 side.

The column base reinforcing structure 100 having such a configuration is assembled to the column base portion of the column 1 to be reinforced to reinforce the column base portion of the column 1 .

Next, the function of the column base reinforcing structure 100 of this embodiment will be described.

When the column 1 erected on the platform girder 5 is reinforced with the column base reinforcing structure 100 of the present embodiment, one side of the base plate 3 of the column 1 and a part of both sides of the one side The extension base plate member 10 is in contact with the end face of the range, and the plate member 20 is fastened to the column main body 2 of the column 1 via the bolt member 30 .

For example, in FIG. 1(b), when the shaking of an earthquake in the horizontal direction acts on the column 1, the base plate 3 portion is moved left and right by the plate edge piece 10b of the additional base plate member 10 that is in contact with the base plate 3 of the column 1. By restricting the movement, the column base of the column 1 can be prevented from shifting to the left and right, and the column base of the column 1 can be prevented from being damaged.
At this time, the bolt member 30 that fastens the column body 2 and the plate member 20 above the base plate 3 also prevents the column base of the column 1 from shifting left and right.

For example, in FIG. 1(b), when the sway of an earthquake in the vertical direction acts on the column 1, the additional base plate member 10 that is in contact with the base plate 3 of the pillar 1 is prevented from shaking in the downward direction in the figure. By restricting the movement of the base plate 3 portion downward in the drawing, the column base of the column 1 can be prevented from shifting downward in the drawing, and the column base of the column 1 can be prevented from being damaged. can.
At this time, the bolt member 30 fastening the column body 2 and the plate member 20 above the base plate 3 also prevents the column base of the column 1 from shifting.

Further, for example, in FIG. 1(b), when the shaking of an earthquake in the vertical direction acts on the column 1, the plate-like member 20 coupled via the bolt member 30 is prevented from shaking upward in the figure. Vibrational energy can be absorbed by deformation of the pillar 1, thereby preventing the pillar base of the pillar 1 from being damaged.
Since the bolt member 30 has a high strength against a force (here, a tensile force) along its axial direction, it can strongly resist shaking of an earthquake in the vertical direction in the figure.

As described above, the column base reinforcing structure 100 of the present embodiment can prevent the column base portion of the column 1 from being damaged even when a relatively large earthquake shakes the column 1 .
For example, with this pedestal reinforcing structure 100, the pedestal of the pillar 1 can be suitably reinforced rather than simply hammering out anchors as in the prior art.
That is, the column base portion of the column 1 can be reinforced more preferably by the column base reinforcing structure 100 .

In particular, since the column base reinforcing structure 100 is designed to be attached to one side of the column 1 to be reinforced, even if the column 1 is embedded in an existing wall, If a part of the column 1 is exposed on the front side of the wall body, the column base reinforcing structure 100 can be installed on the column 1 to reinforce the column base of the column 1. - 特許庁

(Embodiment 2)
Next, Embodiment 2 of the column base reinforcing structure according to the present invention will be described. The same reference numerals are given to the same parts as in the first embodiment, and only the different parts will be explained.

The column base reinforcing structure 100 of Embodiment 2 has, for example, a mode in which rib-like members 21 are provided on both sides of a plate-like member 20, as shown in FIGS. .
Specifically, on both sides of the plate-like member 20 of the column base reinforcing structure 100, rib-like members 21 erected on the additional base plate member 10 are integrally provided. The pair of rib-shaped members 21 are arranged to face each other so as to sandwich a part of the column 1 .

The rib-shaped member 21 is a member made of a steel plate, for example, and is welded to the upper surface of the additional base plate member 10 and to the side portion of the plate-shaped member 20 .
The rising plate 22 formed by welding the rib-shaped member 21 to both side portions of the plate-shaped member 20 has a substantially U-shaped shape when viewed from above, and the edge of the substantially U-shaped notch 10a of the extension base plate member 10 is formed. It has a mode arranged along.

Even with the column base reinforcing structure 100 of the second embodiment, the column base portion of the column 1 can be suitably reinforced.
In particular, the rib-shaped member 21 is provided on both sides of the plate-shaped member 20 to improve the rigidity of the plate-shaped member 20, so that the column base of the column 1 is not damaged by the column base reinforcing structure 100. can be held.
Further, the rib-shaped member 21 also has a function of preventing displacement when vertical movement occurs in addition to horizontal movement, and this also prevents the column base of the column 1 from being damaged.

(Embodiment 3)
Next, Embodiment 3 of the column base reinforcing structure according to the present invention will be described. The same reference numerals are given to the same parts as in the first embodiment, and only the different parts will be explained.

The column base reinforcing structure 100 of Embodiment 3 has a configuration in which the ends of the bolt members 30 that fasten the plate-like member 20 to the column body 2 are movable up and down.
Specifically, as shown in FIGS. 5A, 5B, and 5C, for example, the column base reinforcing structure 100 of the third embodiment is a plate in which a bolt hole 20a, which is an elongated hole along the vertical direction, is formed. a bolt member 30 which is inserted through a long hole (bolt hole 20a) of the plate-shaped member 20 and fastened to the column body 2; The posture switching member 40 and the like are provided.

The posture switching member 40 has a flat plate member 41 formed with a small hole 41 a and a pivot member 42 provided on one surface of the flat plate member 41 .

The flat plate member 41 is made of, for example, a steel plate, and is formed with two small holes 41a through which the bolt members 30 are inserted.
The rotation fulcrum member 42 is, for example, a rod-shaped member made of round steel, and is welded with its axis aligned with an imaginary line connecting the two small holes 41a. there is

The posture switching member 40 is interposed between the plate-like member 20 and the bolt member 30 in such a direction that the peripheral surface (curved surface) of the rotation fulcrum member 42 is brought into contact with the plate-like member 20 .
By swinging the posture switching member 40 around the pivot member 42 as a fulcrum, the end of the bolt member 30 attached to the plate member 20 via the posture switching member 40 moves up and down. Allows switching.

With the column base reinforcing structure 100 having such a configuration, for example, as shown in FIG. In this case, the posture of the bolt member 30 is switched such that the tip of the bolt member 30 moves upward.
Specifically, the bolt member 30 attached to the plate-like member 20 via the posture switching member 40 that can swing about the pivot member 42 is caused to follow the pillar 1 tilted to the left in the figure. , so that the tip of the bolt member 30 is moved upward.

In this way, the bolt member 30 that fastens the plate-like member 20 to the column body 2 enables the change of the posture by moving the end portion up and down, so that a bending moment acts on the bolt member 30. This makes it difficult for the bolt member 30 to break.

On the other hand, for example, if the bolt member 30 that fastens the plate-like member 20 to the column body 2 is firmly fastened so that there is no play that changes its posture, the column 1 will tilt due to the shaking of an earthquake. In such a case, a bending moment acts on the bolt member 30, and the bolt member 30, which is weak against shearing force, may break.
If the bolt member 30 that fastens the plate-like member 20 to the column body 2 breaks, the plate-like member 20 that is connected to the column body 2 via the bolt member 30 is deformed, thereby dissipating vibration energy. Since the bolt member 30 cannot prevent the column base of the column 1 from slipping, the column base of the column 1 may be easily damaged.

With the column base reinforcing structure 100 of Embodiment 3, as shown in FIG. Even if something happens, the posture of the bolt member 30 is switched so that the tip of the bolt member 30 moves upward. is broken and the function of the column base reinforcing structure 100 is not impaired.
Contrary to the state shown in FIG. 5(c), when the pillar 1 tilts to the right in the figure, the posture of the bolt member 30 is switched so that the tip of the bolt member 30 moves downward. , the bending moment is less likely to act on the bolt member 30 .
As described above, even with the column base reinforcing structure 100 of the third embodiment, the column base portion of the column 1 can be suitably reinforced.

In addition, Embodiment 3 is not limited to the above example.
For example, as shown in FIGS. 6(a), 6(b) and 6(c), the pivot member 42 of the posture switching member 40 may be a chevron angle (L-shaped angle) made of bar-shaped steel.
The posture switching member 40 using a chevron angle for the rotation fulcrum member 42 is arranged such that the plate-like member 20 and the bolt member 30 are arranged in such a direction that the bent portion (corner portion) of the rotation fulcrum member 42 is brought into contact with the plate-like member 20 . is interposed between
With the column base reinforcing structure 100 having such a configuration, for example, as shown in FIG. In this case, the posture of the bolt member 30 is switched such that the tip of the bolt member 30 moves upward.
Even with such a column base reinforcing structure 100, the column base portion of the column 1 can be suitably reinforced.

Further, as shown in FIGS. 7A, 7B, and 7C, as the posture switching member 40, a rod-shaped steel material having a semicircular cross section may be used. The posture switching member 40 is formed with two small holes 40c through which the bolt member 30 is inserted.
The posture switching member 40 having a semicircular cross section is interposed between the plate-like member 20 and the bolt member 30 in such a direction that the curved surface thereof contacts the plate-like member 20 .
With the column base reinforcing structure 100 having such a configuration, for example, as shown in FIG. In this case, the posture of the bolt member 30 is switched such that the tip of the bolt member 30 moves upward.
Even with such a column base reinforcing structure 100, the column base portion of the column 1 can be suitably reinforced.

Alternatively, as shown in FIGS. 8A, 8B, and 8C, a spherical washer including a concave washer 40a and a convex washer 40b may be used as the posture switching member 40. FIG.
The posture switching member 40 using a spherical washer is interposed between the plate member 20 and the bolt member 30 with the concave washer 40a facing the plate member 20 and the convex washer 40b facing the bolt member 30.
With the column base reinforcing structure 100 having such a configuration, for example, as shown in FIG. In this case, the posture of the bolt member 30 is switched such that the tip of the bolt member 30 moves upward.
Even with such a column base reinforcing structure 100, the column base portion of the column 1 can be suitably reinforced.

As described above, with the column base reinforcing structure 100 of the present embodiment, the column base portion of the column 1 can be suitably reinforced. 1 can be prevented from being damaged.

In the above embodiment, the case where H-shaped steel is used as the column body 2 has been described as an example, but the present invention is not limited to this, and a rectangular steel pipe or the like may be used as the column body 2. .

In addition, it goes without saying that other specific details such as the structure can be changed as appropriate.

1 Column 2 Column body 3 Base plate 4 Anchor bolt 5 Platform girder (framework)
REFERENCE SIGNS LIST 10 extension base plate 10a notch 10b plate end piece 10c bolt hole 11 anchor bolt 20 plate-like member 20a bolt hole 21 rib-like member 22 rising plate 30 bolt member 31 nut member 40 posture switching member 41 flat plate member 42 rotation fulcrum member 50 reinforcing metal fitting 100 Column base reinforcement structure P Platform R Shed

Claims (3)

A column base reinforcing structure comprising a rectangular plate-shaped base plate and a column body erected on the upper surface of the base plate, the base plate reinforcing a column base portion of the column fixed on a predetermined skeleton, ,
an extension base plate member that abuts on an end face of one side of the base plate and a range covering a part of the end faces of both sides of the one side and is fixed to the frame;
At a position along the edge of the additional base plate member that abuts on the one side of the base plate, with one surface facing the pillar body , there is a gap between the pillar body and the pillar body. a plate-shaped member erected in a spaced apart arrangement;
a bolt member that fastens the plate member to the column body;
A column base reinforcement structure comprising: Rib-shaped members erected on the additional base plate member are integrally provided on both sides of the plate-shaped member,
The column base reinforcing structure according to claim 1, wherein the pair of rib-shaped members face each other in a direction that sandwiches a portion of the column. The bolt member is inserted through a vertically elongated hole formed in the plate-like member and fastened to the column body. 3. The pedestal reinforcing structure according to claim 1 or 2, wherein a posture switching member is interposed to enable switching of postures in which the ends of the bolt members move up and down.

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