JP2019163592A - Structure for reinforcing column base - Google Patents

Abstract

To provide a structure for reinforcing column base which enables suitable reinforcement of a column base.SOLUTION: In a structure for reinforcing column base 100, an additional base plate member 10 is in abutting contact with an end face of a column 1 in the range including a side of a base plate 3 and a part of its neighboring sides, and therefore, when an earthquake affects the column 1, the additional base plate member 10 in abutting contact with the base plate 3 of the column 1 prevents the column base of the column 1 as controlling the base plate 3 from moving horizontally to prevent damage to the column base of the column 1. Also, a plate-like member 20 is connected to a column main body 2 of the column 1 using a bolt member 30. When an earthquake affects the column 1, the plate-like member 20 connected using the bolt member 30 deforms to absorb the energy of tremors, which prevents damage to the column base of the column 1.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a column base reinforcing structure that reinforces a column base of a column.

  Conventionally, in order to provide seismic reinforcement for existing structures, reinforcing brackets that have a horizontal plate, vertical plate, and swash plate and have a substantially right-angled triangular shape in side view have been installed on the column bases of structural columns. An earthquake-proof reinforcement structure is known in which anchors are added using the reinforcing metal fittings (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 10-331437

  However, in the case of the reinforcing structure disclosed in Patent Document 1, the movement of the column base is restricted by the reinforcement by the increased anchor, and the column base fixed to the concrete frame or the like can be prevented from shifting in the horizontal direction. However, if the column is greatly bent due to a relatively large earthquake, the anchor portion may not be able to follow the deformation and may be damaged, and the function of the reinforcing structure may be impaired.

  The objective of this invention is providing the column base reinforcement structure which can reinforce the column base part of a column suitably.

In order to achieve the above object, the present invention provides:
A column base reinforcement structure comprising a rectangular plate-like base plate and a column main body standing upright on the upper surface of the base plate, wherein the base plate reinforces a column base of a column fixed on a predetermined housing. ,
An extension base plate member that is in contact with an end surface of one side of the base plate and a range over a part of the end surfaces of both sides of the one side, and is fixed to the housing;
A plate-like member that is erected with its one surface facing the pillar body at a position along the edge of the additional base plate member that is in contact with the one side of the base plate;
A bolt member fastening the plate-like member to the pillar body;
I was prepared to.

  The column base reinforcing structure having such a structure is such that the additional base plate member abuts on one end of the column base plate and a part of the side extending over both sides of the one side, and the bolt member is attached to the column main body. The plate-like member is in a state of being fastened via the. At this time, the base plate of the pillar is disposed between both end pieces of the extension base plate member.

For example, when an earthquake shake in a direction along one side of the base plate acts on the column, the additional base plate member that is in contact with the base plate of the column is restricted from moving along with the shake. Thus, it is possible to prevent the column base of the column from being displaced in the horizontal direction and to prevent the column base of the column from being damaged.
Also, for example, when an earthquake shake in a direction intersecting one side of the base plate acts on the column, the column base plate swings in the direction toward the additional base plate member (the direction in which the column main body of the column is close to the plate member) The column base of the column shifts in the horizontal direction by restricting the movement of the base plate part due to the swing by the additional base plate member in contact with the base plate of the column. This can prevent the column base of the column from being damaged.
Also, for example, when an earthquake shake in a direction intersecting with one side of the base plate acts on the pillar, the pillar body of the pillar is coupled via a bolt member to the shake in a direction away from the plate member. It is possible to prevent the column base of the column from being damaged by absorbing the vibration energy by the deformation of the plate-shaped member.

Thus, with this column base reinforcement structure, the column base portion of the column can be suitably reinforced rather than simply adding anchors, and even if a relatively large earthquake shake acts on the column, the column It is possible to prevent the column base portion from being damaged.
In particular, this column base reinforcement structure is designed to be attached to one side of the column to be reinforced, so even if the column is embedded in an existing wall, one side of the column and one side column on both sides of the column. If the portion is exposed on the front side of the wall body, the column base reinforcement structure can be installed on the column to reinforce the column base of the column.

Also, preferably
Rib-like members standing on the additional base plate member are integrally provided on both sides of the plate-like member,
The pair of rib-shaped members are opposed to each other in a direction sandwiching a part of the column.

  Since the rib-like member is provided on both sides of the plate-like member and the rigidity of the plate-like member is improved, it can be suitably reinforced so that the column base portion of the column is not damaged by this column base reinforcing structure.

Also, preferably
The bolt member is inserted into an elongated hole formed in the plate-like member along the vertical direction and fastened to the column main body, and the bolt member is interposed between the bolt member and the plate-like member. A posture switching member that enables switching of the posture in which the end of the member moves up and down is provided.

If the bolt member that fastens the plate-like member to the column main body can be switched in a posture in which its end is moved up and down by the interposed posture switching member, for example, one side of the base plate When the seismic shaking in the direction intersecting the axis acts on the column and the column body of the column is tilted away from the plate-like member, the position of the bolt member is adjusted so that the tip of the bolt member moves upward. It is designed to switch.
By switching the posture of the bolt member in this way, it is difficult for a bending moment to act on the bolt member, and the bolt member is difficult to break.
The bolt member may be inserted into a loose hole formed in the plate-like member and fastened to the column main body. Even in this case, the posture of the bolt member is similarly switched, so that a bending moment hardly acts on the bolt member, and the bolt member hardly breaks.

  On the other hand, for example, if the bolt member that fastens the plate-like member to the pillar body is firmly fastened so that there is no play that changes its posture, Since a bending moment acts on a bolt member and a bolt member weak against a shearing force may break, it is not preferable.

  According to the present invention, the column base portion of the column can be suitably reinforced.

They are the perspective view (a) which shows the column base reinforcement structure of Embodiment 1, and a top view (b). It is a perspective view which shows the reinforcement metal fitting used for the column base reinforcement 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). It is a perspective view which shows the reinforcement metal fitting used for the column base reinforcement structure of Embodiment 2. The perspective view (a) which shows the column base reinforcement structure of Embodiment 3, the perspective view (b) which shows the attitude | position switching member used for the column base reinforcement structure, and explanatory drawing (c) regarding the function of this column base reinforcement structure is there. The perspective view (a) which shows the modification of the column base reinforcement structure of Embodiment 3, the perspective view (b) which shows the attitude | position switching member used for the column base reinforcement structure, and explanatory drawing regarding the function of this column base reinforcement structure ( c). The perspective view (a) which shows the modification of the column base reinforcement structure of Embodiment 3, the perspective view (b) which shows the attitude | position switching member used for the column base reinforcement structure, and explanatory drawing regarding the function of this column base reinforcement structure ( c). The perspective view (a) which shows the modification of the column base reinforcement structure of Embodiment 3, the perspective view (b) which shows the attitude | position switching member used for the column base reinforcement structure, and explanatory drawing regarding the function of this column base reinforcement structure ( c). It is explanatory drawing which shows the upper house of a platform.

  Hereinafter, with reference to drawings, the embodiment of the column base reinforcement structure concerning the present invention is described in detail. 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.

In the present embodiment, for example, a column base reinforcement structure that reinforces the column 1 of the upper house R of the platform P of the elevated station as illustrated in FIG. 9 will be described as an example.
As shown in FIG. 9, the pillar 1 of the upper house R is erected on a home beam 5 constituting the platform P.
The home girder 5 is a reinforced concrete frame. The home girder 5 is provided with a concrete home slab (not shown) so as to be able to walk on the platform P.
As illustrated in FIGS. 1A and 1B, the column 1 includes a rectangular plate-like base plate 3 and a column main body 2 erected on the upper surface of the base plate 3.
The lower end of the column main body 2 is welded to the upper surface of the base plate 3, the base plate 3 is fixed to the home beam 5 by the anchor bolt 4 for fixing the column, and the column 1 is fixed on the home beam 5. .
Note that the column main body 2 in the present embodiment is inside the outer edge of the base plate 3 and has a smaller outer size (outline) than the base plate 3 when viewed from above.
In the present embodiment, H-shaped steel is used as the column main body 2.

  The column base reinforcement structure 100 of this embodiment is for reinforcing the column base portion of a column in which the base plate 3 portion of the column 1 is fixed on a predetermined housing (here, the home girder 5).

(Embodiment 1)
For example, as shown in FIGS. 1A and 1B, the column base reinforcing structure 100 according to the first embodiment is configured so that one side of the base plate 3 surrounds a part of the periphery of the base plate 3 of the column 1. And an extended base plate member 10 fixed to the home girder 5 and a side of one side of the base plate 3. A plate-like member 20 erected with its one surface facing the column main body 2 at a position along the edge of the extended base plate member 10 and a bolt member 30 fastening the plate-like member 20 to the column main body 2. Etc.

  That is, the column base reinforcing structure 100 has the reinforcing metal fitting 50 composed of the extension base plate member 10 and the plate-like member 20, and the extension base plate member 10 of the reinforcing metal fitting 50 is fixed to the home girder 5. The columnar member 20 of the column 1 is reinforced by fixing the plate member 20 of the reinforcing metal fitting 50 to the column main body 2.

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 extended base plate member 10 is brought into contact with the base plate 3 so that the substantially U-shaped notch 10 a is fitted to one side of the base plate 3.
In other words, the extension 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.
In this way, the end surface of the substantially U-shaped notch 10a portion of the extension base plate member 10 is brought into contact with one end of the base plate 3 and a part of the side on both sides of the one side, thereby the base plate. The reinforcing metal fitting 50 is assembled to the No.3.
In addition, when there is a gap between the plate end piece 10b and the base plate 3, it is preferable to eliminate loosening by driving a wedge member into the gap.

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

The plate-like member 20 is a member having a bending ductility (plastic deformability) made of a steel plate, for example, and is welded to the upper surface of the extension base plate member 10.
Specifically, the plate-like member 20 is welded to the upper surface of the extension base plate member 10 at a position along the center side edge of the substantially U-shaped notch 10a, and one surface thereof is welded to the column main body 2. Standing in a posture toward
The plate-like member 20 is provided with a bolt hole 20a, and the bolt member 30 is fastened to the column main body 2 (here, an H-shaped steel flange) through the bolt hole 20a. The reinforcing metal fitting 50) is fixed to the column main body 2.

The bolt hole 20a of the plate member 20 is preferably a loose hole. If the bolt hole 20a of the plate-like member 20 is formed in a slightly larger hole (loose hole), there is play in the bolt member 30 that fastens the plate-like member 20 to the column body 2, so that bolt member The bending moment hardly acts on 30.
For example, if the bolt member 30 that fastens the plate-like member 20 to the column main body 2 is firmly fastened so that there is no play that changes its posture, the column 1 tilts due to the shaking of the earthquake, Since a bending moment acts on the bolt member 30 and the bolt member 30 weak against the shearing force may break, it is not preferable.

The bolt member 30 is a member fastened to the column main body 2 through the bolt hole 20a of the plate-like member 20, and a nut member 31 is screwed to the tip of the bolt member 30 on the column main body 2 side.
The bolt member 30 may be attached from the column body 2 side, and the nut member 31 may be attached to the plate-like 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 reinforcement structure 100 of this embodiment is demonstrated.

  When the pillar 1 erected on the home girder 5 is reinforced with the column base reinforcement structure 100 of the present embodiment, it extends over one side of the base plate 3 of the pillar 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-like member 20 is fastened to the column main body 2 of the column 1 via the bolt member 30.

For example, in FIG. 1B, when a horizontal earthquake shake is applied to the pillar 1, the base plate 3 portion is left and right by the plate end piece 10 b of the additional base plate member 10 in contact with the base plate 3 of the pillar 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 column base portion of the column 1 is also prevented from shifting to the left and right by the bolt member 30 that fastens the column main body 2 and the plate-like member 20 above the base plate 3.

Further, for example, in FIG. 1B, when a vertical earthquake shake acts on the pillar 1, the extension base plate member 10 that is in contact with the base plate 3 of the pillar 1 against the downward shake in the figure. This prevents the base plate 3 portion from moving downward in the figure, thereby preventing the column base of the column 1 from shifting downward in the figure and preventing the column base of the column 1 from being damaged. it can.
At this time, the column base portion of the column 1 is also prevented from being displaced by the bolt member 30 that fastens the column main body 2 and the plate-like member 20 above the base plate 3.

Further, for example, in FIG. 1B, when a vertical earthquake shake acts on the pillar 1, the plate-like member 20 coupled via the bolt member 30 against the upward shake in the figure. It is possible to prevent the column base portion of the column 1 from being damaged by absorbing the vibration energy by deforming.
The bolt member 30 has a high strength against a force along the axial direction (here, a tensile force), and therefore can strongly resist an earthquake shake in the vertical direction in the figure.

Thus, with the column base reinforcement structure 100 of the present embodiment, even if a relatively large earthquake shake acts on the column 1, the column base portion of the column 1 can be prevented from being damaged.
For example, with this column base reinforcement structure 100, it is possible to preferably reinforce the column base portion of the column 1 rather than simply adding anchors as in the prior art.
In other words, the column base portion of the column 1 can be more preferably reinforced by the column base reinforcing structure 100.

  In particular, this column base reinforcing structure 100 is designed to be attached to one side of the column 1 to be reinforced, so that even if the column 1 is embedded in an existing wall, one side of the column 1 and both sides of the one side If a part of the column 1 is exposed on the front side of the wall body, the column base reinforcement structure 100 can be installed on the column 1 to reinforce the column base of the column 1.

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

The column base reinforcement structure 100 of Embodiment 2 has a mode in which rib-like members 21 are provided on both sides of the plate-like member 20 as shown in FIGS. 3 (a) and 3 (b) and FIG. 4, for example. .
Specifically, rib-like members 21 standing on the extension base plate member 10 are integrally provided on both sides of the plate-like member 20 of the column base reinforcing structure 100. The pair of rib-like members 21 are provided so as to face each other in a direction sandwiching a part of the pillar 1.

The rib-like member 21 is a member made of, for example, a steel plate, and is welded to the upper surface of the extension base plate member 10 and is welded to the side portion of the plate-like member 20.
The rising plate 22 in which the rib-like member 21 is welded to both sides of the plate-like member 20 has a substantially U-shape when viewed from above, and the edge of the substantially U-shaped notch 10a of the additional base plate member 10. It has the aspect arrange | positioned along.

Even in such a column base reinforcement structure 100 of the second embodiment, the column base of the column 1 can be suitably reinforced.
In particular, since the rib-like member 21 is provided on both sides of the plate-like member 20 and the rigidity of the plate-like member 20 is improved, it is preferable that the column base portion of the column 1 is not damaged by the column base reinforcing structure 100. Can be held in.
Further, the rib-like member 21 also has a function of preventing deviation when vertical movement occurs in addition to horizontal movement, and this can also prevent the column base portion 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 parts as those in the first embodiment are denoted by the same reference numerals, and only different parts will be described.

The column base reinforcing structure 100 of the third embodiment has a configuration in which the end of the bolt member 30 that fastens the plate-like member 20 to the column main body 2 can be moved up and down.
Specifically, the column base reinforcing structure 100 according to the third embodiment is, for example, a plate in which bolt holes 20a that are long holes along the vertical direction are formed as shown in FIGS. 5 (a), 5 (b), and 5 (c). A member 20, a bolt member 30 inserted through a long hole (bolt hole 20 a) of the plate member 20 and fastened to the column body 2, and interposed between the bolt member 30 and the plate member 20. The posture switching member 40 is provided.

  The posture switching member 40 includes a flat plate member 41 in which a small hole 41 a is formed, and a rotation fulcrum member 42 provided on one surface of the flat plate member 41.

The flat plate member 41 is a member made of, for example, a steel plate, and has 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, welded along an imaginary line connecting the two small holes 41a, and fixed to one surface of the flat plate member 41. Yes.

The posture switching member 40 is interposed between the plate member 20 and the bolt member 30 in a direction in which the peripheral surface (curved surface) of the rotation fulcrum member 42 is brought into contact with the plate member 20.
The posture switching member 40 swings around the rotation fulcrum member 42 as a fulcrum so that the end of the bolt member 30 attached to the plate member 20 via the posture switching member 40 moves up and down. Switching is possible.

In the column base reinforcing structure 100 having such a configuration, for example, as shown in FIG. 5C, a relatively large earthquake shake acts on the column 1 and the column 1 tilts to the left in the figure. In this case, the posture of the bolt member 30 is switched so 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 around the pivot fulcrum member 42 is caused to follow the column 1 tilted to the left in the figure. The posture of the bolt member 30 is switched so as to move the tip of the bolt member 30 upward.

  Thus, the bolt member 30 fastening the plate-like member 20 to the column main body 2 enables switching of the posture in which the end portion is moved up and down, so that a bending moment acts on the bolt member 30. The bolt member 30 is difficult to break.

On the other hand, for example, if the bolt member 30 that fastens the plate-like member 20 to the column main body 2 is firmly fastened so that there is no play that changes its posture, the column 1 is inclined by the shaking of the earthquake. In this case, a bending moment may act on the bolt member 30, and the bolt member 30 that is weak against the shearing force may be broken.
If the bolt member 30 that fastens the plate-like member 20 to the column main body 2 is broken, the plate-like member 20 coupled to the column main body 2 via the bolt member 30 is deformed to thereby generate vibration energy. Since it cannot be absorbed or it cannot be prevented that the column base portion of the column 1 is displaced by the bolt member 30, the column base portion of the column 1 may be easily damaged.

In the column base reinforcing structure 100 of the third embodiment, as shown in FIG. 5C, a relatively large earthquake shake acts on the column 1 so that the column 1 tilts to the left side in the drawing. Even if there is nothing, the posture of the bolt member 30 is switched so that the tip of the bolt member 30 moves upward, and it is difficult for a bending moment to act on the bolt member 30. Is broken and the function of the column base reinforcing structure 100 is not impaired.
Contrary to the state shown in FIG. 5C, when the column 1 is inclined to the right side 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 in the column base reinforcing structure 100 of the third embodiment, the column base portion of the column 1 can be suitably reinforced.

The third embodiment is not limited to the above example.
For example, as shown in FIGS. 6A, 6 </ b> B, and 6 </ b> C, the rotation fulcrum member 42 of the posture switching member 40 may be a mountain-shaped angle (L-shaped angle) that is a rod-shaped steel material.
The posture switching member 40 using a chevron angle for the rotation fulcrum member 42 has the plate-like member 20 and the bolt member 30 in a direction in which the bent portion (corner) of the rotation fulcrum member 42 abuts the plate-like member 20. It is intervened between.
With the column base reinforcing structure 100 having such a configuration, for example, as shown in FIG. 6C, a relatively large earthquake shake acts on the column 1 and the column 1 tilts to the left in the figure. In this case, the posture of the bolt member 30 is switched so that the tip of the bolt member 30 moves upward.
Even with such a column base reinforcement structure 100, the column base portion of the column 1 can be suitably reinforced.

Moreover, as shown to Fig.7 (a) (b) (c), you may use the rod-shaped steel material which a cross section exhibits a semicircle shape as the attitude | position switching member 40. FIG. The posture switching member 40 is formed with two small holes 40c through which the bolt members 30 are inserted.
The posture switching member 40 having a semicircular cross section is interposed between the plate member 20 and the bolt member 30 in a direction in which the curved surface abuts the plate member 20.
In the column base reinforcing structure 100 having such a configuration, for example, as shown in FIG. 7C, a relatively large earthquake shake acts on the column 1 and the column 1 is inclined to the left side in the drawing. In this case, the posture of the bolt member 30 is switched so that the tip of the bolt member 30 moves upward.
Even with such a column base reinforcement structure 100, the column base portion of the column 1 can be suitably reinforced.

8A, 8B, and 8C, a spherical washer composed of a concave washer 40a and a convex washer 40b may be used as the posture switching member 40.
The posture switching member 40 using the spherical washer is interposed between the plate-like member 20 and the bolt member 30 with the concave washer 40 a on the plate-like member 20 side and the convex washer 40 b on the bolt member 30 side.
With the column base reinforcing structure 100 having such a configuration, for example, as shown in FIG. 8C, a relatively large earthquake shake acts on the column 1 and the column 1 tilts to the left in the figure. In this case, the posture of the bolt member 30 is switched so that the tip of the bolt member 30 moves upward.
Even with such a column base reinforcement structure 100, the column base portion of the column 1 can be suitably reinforced.

  As described above, the column base reinforcement structure 100 of the present embodiment can suitably reinforce the column base of the column 1, so that even if a relatively large earthquake shake acts on the column 1, the column It is possible to prevent the 1 column base portion from being damaged.

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

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

1 pillar 2 pillar body 3 base plate 4 anchor bolt 5 home girder (frame)
DESCRIPTION OF SYMBOLS 10 Extension base plate 10a Notch 10b Plate end piece 10c Bolt hole 11 Anchor bolt 20 Plate member 20a Bolt hole 21 Rib-shaped member 22 Standing plate 30 Bolt member 31 Nut member 40 Posture switching member 41 Flat plate member 42 Rotating fulcrum member 50 Reinforcing bracket 100 Column base reinforcement structure P platform R

Claims (3)

A column base reinforcement structure comprising a rectangular plate-like base plate and a column main body standing upright on the upper surface of the base plate, wherein the base plate reinforces a column base of a column fixed on a predetermined housing. ,
An extension base plate member that is in contact with an end surface of one side of the base plate and a range over a part of the end surfaces of both sides of the one side, and is fixed to the housing;
A plate-like member that is erected with its one surface facing the pillar body at a position along the edge of the additional base plate member that is in contact with the one side of the base plate;
A bolt member fastening the plate-like member to the pillar body;
Column base reinforcement structure characterized by comprising. Rib-like members standing on the additional base plate member are integrally provided on both sides of the plate-like member,
The column base reinforcing structure according to claim 1, wherein the pair of rib-shaped members are opposed to each other in a direction sandwiching a part of the column. The bolt member is inserted into an elongated hole formed in the plate-like member along the vertical direction and fastened to the column main body, and the bolt member is interposed between the bolt member and the plate-like member. The column base reinforcement structure according to claim 1, wherein a posture switching member that enables switching of a posture in which the end of the member moves up and down is interposed.

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