JP7134084B2 - Reinforcement structure of column foundation for exposed column base - Google Patents

Description

INDUSTRIAL APPLICABILITY The present invention provides an exposed column base capable of ensuring excellent resistance to deformation of anchor bolts without increasing the size of the column foundation, and appropriately suppressing cone-shaped failure of the column concrete body. The present invention relates to a reinforcement structure for a pillar-type foundation.

For example, Patent Document 1 is known as a structure of a reinforced concrete column foundation on which a column base such as a steel frame column is placed in an exposed state. In Patent Document 1, "a structure connecting a column base of a building or the like and a foundation structure", a reinforced concrete foundation column is erected on a concrete foundation, and the upper end of the foundation column is placed in the foundation column. A steel column base with a base plate at the lower end is placed on the foundation column, and the protruding main reinforcement is passed through the bolt insertion hole of the base plate. and tighten the nuts for the threaded rebars.

Full specification of Japanese utility model No. 2-66852

In a reinforced concrete column foundation on which an exposed column base is placed, the column base is joined and fixed to the column foundation via anchor bolts embedded in the column concrete body that constitutes the foundation.

When horizontal external force such as seismic force acts on the column base, the anchor bolt is subjected to shear force, etc., and is deformed so as to press the concrete horizontally, and the concrete is pushed out toward the outer surface of the column foundation. , it is known that cone-shaped failures occur in column-shaped concrete bodies.

In order to prevent this cone-shaped failure, it is conceivable to construct a rigid column foundation by arranging a large amount of reinforcing bars in the column foundation so that the deformation of the anchor bolt can be suppressed.

However, when a large amount of reinforcing bars are arranged and buried in the column concrete body, the column foundation becomes large. Larger column foundations not only increase material costs, but also make construction more complicated, increasing costs and lengthening the construction period. There was a problem of narrowing.

The present invention has been devised in view of the above-mentioned conventional problems. An object of the present invention is to provide a reinforcing structure for a column foundation for an exposed column base that can appropriately suppress destruction.

The reinforcing structure of the column foundation for the exposed column base according to the present invention comprises a plurality of risers arranged in a circular arrangement along the vertical height direction in the column concrete body, and the outer periphery of these risers. A plurality of hoop bars formed in an annular shape surrounding the riser bar and arranged in multiple stages in the vertical direction of the riser bar, and a plurality of anchor bolts positioned inwardly of the riser bar and arranged in an annular array. is embedded, and an exposed column base is installed and fixed on the column concrete body via the anchor bolt, wherein the column foundation is between the anchor bolt and the outer surface of the column concrete body. , from the uppermost hoop bar to the lower hoop bar, the anchor bolts are arranged inside a plurality of the hoop bars, and each of the anchor bolts is installed in the column concrete in the direction orthogonal to the outer surface of the column concrete body. A reinforcing plate is provided so as to cover the outer surface of the body.

A plate surface of the reinforcing plate is brought into contact with the hoop from the anchor bolt side.

A plurality of reinforcing plates are provided so as to individually correspond to each of the plurality of anchor bolts.

A dimension in a width direction of the reinforcing plate along a circumferential direction of the hoop reinforcement is equal to or larger than an outer diameter dimension of the anchor bolt.

The dimension of the reinforcing plate in the vertical height direction along the length direction of the rising bar is set so as to be in contact with at least the hoop bar on the uppermost stage and the hoop bar directly below it.

The column-shaped concrete body has a rectangular cross-section, and the reinforcing plates are arranged at the corners of the column-shaped concrete body to face the pair of outer surfaces of the column-shaped concrete body. It is characterized in that it is provided between one of the outer surfaces having a short distance from the anchor bolt and the anchor bolt.

The reinforcing plate is characterized in that a hook is formed on the uppermost hoop for hooking from above.

The reinforcing plate is characterized by having holes for pouring the placed concrete.

The reinforcing plate is provided with reinforcing ribs.

The reinforcing plate is characterized by being provided with a connecting portion for connecting the reinforcing plates adjacent to each other .

The reinforcing plate is formed in the shape of a corrugated plate having rib-shaped protrusions formed in multiple stages in the vertical direction, and the rib-shaped protrusions are arranged between the hoop muscles that are vertically adjacent to each other. and

In the reinforcing structure of the column foundation for the exposed type column base according to the present invention, it is possible to ensure excellent resistance to deformation of the anchor bolts without increasing the size of the column foundation, and the cone of the column concrete body can be secured. Destruction of the shape can be appropriately suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing explaining 1st Embodiment of the reinforcement structure of the column type foundation for exposed type|mold column bases which concerns on this invention. It is explanatory drawing explaining 2nd Embodiment of the reinforcement structure of the column type foundation for exposed type|mold column bases which concerns on this invention. It is a partially broken sectional side view which shows the modification of the reinforcement structure of the column type foundation for exposed type|mold column bases which concerns on this invention. It is explanatory drawing explaining the other modification of the reinforcement structure of the column type foundation for exposed type|mold column bases which concerns on this invention. FIG. 5 shows a partial perspective view of a reinforcing plate used in the variant shown in FIG. 4; FIG. 11 is an explanatory diagram illustrating still another modified example of the reinforcement structure of the column foundation for exposed column bases according to the present invention. FIG. 7 shows a partial perspective view of a reinforcing plate used in the variant shown in FIG. 6; It is explanatory drawing explaining the modification of the reinforcement plate applicable to the reinforcement structure of the column foundation for exposed type|mold column bases which concerns on this invention. FIG. 3 is an explanatory diagram illustrating a first example using channel steel for the first and second embodiments shown in FIGS. 1 and 2 ; FIG. FIG. 10 is a perspective view showing how the channel steel shown in FIG. 9 is assembled; FIG. 11 is a view of the first example shown in FIG. 9 in which reinforcing plates are provided on the longitudinal channel steel as viewed from the direction of arrow U in FIG. 10 ; FIG. 3 is a perspective view of how channel steels are assembled, explaining a second example using channel steels in the first and second embodiments shown in FIGS. 1 and 2 ;

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of a reinforcing structure for a column foundation for exposed column bases according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows a first embodiment of a reinforcement structure for a column foundation for an exposed column base. FIG. 1(A) is a cross-sectional plan view of a column foundation, FIG. 1(B) is a cross-sectional view taken along line PP in FIG. 1(A), and FIG. 1(C) is used for a reinforcing structure. It is a side view of a reinforcement plate.

The reinforced concrete column foundation 1 itself for the exposed column base is conventionally known, and the rising bars 2 are arranged in a ring shape in the circumferential direction of the column concrete body 3 along the vertical height direction of the column concrete body 3. A plurality of reinforcing bars are arranged at equal intervals in an array, and a plurality of circularly formed hoop bars 4 surrounding the outer periphery of these rising bars 2 are arranged in multiple stages in the vertical height direction of the rising bars 2, and anchors. The bolts 5 are brought closer to the central side of the flat cross section of the column concrete body 3 so as to be positioned inside the hoop reinforcement 4 rather than the rising bars 2, and are arranged in a circular arrangement in the circumferential direction of the column concrete body 3. A plurality of anchor bolts 5, rising bars 2 and hoop bars 4 are arranged at intervals and embedded in the column-shaped concrete body 3 by placing concrete.

A column base portion 6 such as a steel frame column has a base plate 7 overlaid on a grout portion 8 formed on the column-shaped concrete body 3, and anchor bolts 5 protruding upward from the column-shaped concrete body 3. The upper end portion 5a is inserted through the hole of the base plate 7 via the grout portion 8, and the upper end portion 5a of the anchor bolt 5 is installed and fixed on the column foundation 1 by fastening the nut 9 to the upper end portion 5a. . Such a column foundation 1 is connected to foundation beams or foundation slabs, or provided at the top of a footing.

In the column foundation 1 for exposed type column bases according to the present embodiment, the column concrete body 3 is formed in a column shape having a rectangular shape in plan view, and a square shape in plan view in the illustrated example. The pillar-shaped foundation 1 includes a reinforcing plate 10 embedded in the pillar-shaped concrete body 3 . The planar cross-sectional shape of the columnar concrete body 3 is not limited to a rectangular shape, and may be any shape such as a circular shape.

The reinforcing plate 10 of the present embodiment is formed of a flat plate having a strip shape and a flat plate surface 10a. The reinforcing plates 10 are arranged in a one-to-one correspondence with each of the anchor bolts 5 in order to resist the deformation of the anchor bolts 5 to push out the concrete of the column-shaped concrete body 3 . be provided.

In the illustrated example, two anchor bolts 5 are embedded in each side of the column-shaped concrete body 3 having a square cross section, for a total of eight anchor bolts 5, and eight reinforcing plates 10 are also provided. The number of anchor bolts 5 does not matter.

In order to suppress the deformation of the anchor bolts 5, the concrete is pushed out toward the outer surface 3a of the column-shaped concrete body 3. The reinforcement plate 10 includes each anchor bolt 5 and the column-shaped concrete facing the anchor bolts 5. It is provided between the outer surface 3 a of the body 3 .

As shown in the figure, when two anchor bolts 5 are arranged on each side of a concrete column 3 having a square cross-section at equal intervals in a ring, four corners of the concrete column 3 Two anchor bolts 5x and 5y are arranged at each corner 3b or its periphery. These anchor bolts 5x and 5y both face a pair of sides forming the corner 3b, that is, a pair of outer surfaces 3ax and 3ay of the column-shaped concrete body 3. As shown in FIG.

At this time, one anchor bolt 5x of the two anchor bolts 5x and 5y is close to one outer surface 3ax of the pair of outer surfaces 3ax and 3ay (see jx in the figure), is located remotely (see jy in the figure), the other anchor bolt 5y is located close to the other outer surface 3ay (see ky in the figure) and is located far from the one outer surface 3ax (see kx in the figure). reference).

In this case, the reinforcement plate 10 is provided between the anchor bolts 5x and 5y in order to reinforce the portion between the anchor bolts 5 and the outer surface 3a of the column-shaped concrete body 3 where the thickness of the concrete is thin and the cone-shaped failure is likely to occur. It is provided between one of the outer surfaces 3ax, 3ay having a short separation distance (jx, ky) and the anchor bolts 5x, 5y.

Although not shown, eight anchor bolts 5 are arranged in an annular shape so that one is arranged for each of the four sides of the column concrete body 3 and one is arranged for each of the four corners 3b. When arranged in an array, the anchor bolts 5 of each corner 3b may face both of the pair of outer surfaces 3a forming the corner 3b at an equal distance.

In this case, two reinforcing plates 10 are provided for one anchor bolt 5 by interposing the reinforcing plate 10 between the anchor bolt 5 and each of the pair of outer surfaces 3a. That is, in this case, two reinforcing plates 10 are provided for one anchor bolt 5 at a ratio of 1:2. The configuration will be understood with reference to a second embodiment described later.

The anchor bolt 5 is directly joined to the column base portion 6, and when an external force in the horizontal direction is input from the column base portion 6, the upper end portion 5a of the anchor bolt 5 undergoes greater deformation than other portions, For this reason, the cone-shaped failure is likely to occur in the upper portion of the columnar concrete body 3 adjacent to the upper end portion 5a. In order to reinforce the upper part of the column-shaped concrete body 3, the reinforcing plate 10 is provided from the uppermost hoop reinforcement 4A close to the upper end 5a of the anchor bolt 5 to any of the lower hoop reinforcements 4.

For example, the reinforcing plate 10 has a length dimension L in the vertical height direction along the length direction of the rising bar 2, that is, the length dimension of the plate surface 10a is at least the uppermost hoop bar 4A and the second hoop bar directly below it. It is set so as to extend over the hoop muscles of the stage. In the illustrated example, the reinforcing plate is formed with a length dimension ranging from the uppermost stage to the third stage hoop reinforcement 4 . Of course, the length dimension L of the reinforcing plate 10 may be set appropriately.

The reinforcement plate 10, together with the plurality of hoop reinforcements 4 (including 4A, the same applies hereinafter), resists the pushing action of the concrete toward the outer surface 3a of the column-shaped concrete body 3 due to the deformation of the anchor bolts 5. It is arranged and provided inside the hoop muscle 4 . In this embodiment, the reinforcing plate 10 is provided so as to be inscribed in these hoop bars 4 .

The fact that the reinforcing plate 10 is inscribed in the hoop reinforcement 4 means that the flat plate surface 10a of the reinforcement plate 10 is pushed toward the hoop reinforcement 4 from the side of the anchor bolt 5 that is arranged closer to the center side of the horizontal cross section of the column-shaped concrete body 3. It refers to contacting the inner peripheral surface of the As a result, the reinforcing plate 10 is prevented from being extruded outside the hoop reinforcement 4, thereby suppressing the pushing action of the concrete.

The reinforcement plate 10 has a corresponding relationship in the direction orthogonal to the outer surface 3a of the column concrete body 3 in order to precisely and reliably suppress the pushing action of the concrete column body 3 due to the deformation of the anchor bolts 5. Each anchor bolt 5 is provided so as to cover the outer surface 3a of the column-shaped concrete body 3. As shown in FIG.

In other words, when the outer surface 3a of each side of the column-shaped concrete body 3 is irradiated with light toward the anchor bolts 5 from a direction orthogonal to the outer surface 3a, the structure becomes a shadow of the reinforcing plate 10. The installation position of the reinforcing plate 10 is set so that the anchor bolt 5 is located at the position, that is, within the projected range of the reinforcing plate 10 (indicated by M in the drawing).

In relation to this configuration, the width dimension W of the reinforcing plate 10 along the circumferential direction of the hoop reinforcement 4 in which the reinforcing plate 10 is inscribed, that is, the width dimension of the plate surface 10a is the pressure receiving surface against the extrusion of concrete due to the deformation of the anchor bolts 5. is set to be greater than or equal to the outer diameter D of the anchor bolt 5 so as to reliably form and receive pressure.

The reinforcing plate 10 is formed with hooks 11 for hooking onto the uppermost hoop reinforcement 4A from above in order to facilitate the installation of the reinforcement plate 10 in contact with the plurality of hoop reinforcements 4. As shown in FIG. The hook 11 is integrally provided with the reinforcing plate 10 and is composed of a bent portion 11a connected to the upper end of the reinforcing plate 10 and a hook piece 11b suspended from the bent portion 11a and circumscribing the hoop 4. As shown in FIG.

When the reinforcement plate 10 is inscribed in the hoop reinforcement 4 by the hook 11 and attached, the reinforcement plate 10 and the hook piece 11b of the hook 11 sandwich the hoop reinforcement 4.例文帳に追加The hook 11 is not limited to this configuration, and various conventionally known configurations can be adopted.

Next, the operation of the reinforcement structure for the column foundation for the exposed column base according to the first embodiment will be described. When constructing the column foundation 1, the riser reinforcement 2 and the hoop reinforcement 4 are arranged, and the anchor bolts 5 are arranged. and place it in the above-mentioned predetermined position.

After that, a formwork is assembled, concrete is placed inside the formwork, and the anchor bolts 5, the reinforcing plate 10, and the like are buried. As a result, the reinforced concrete column foundation 1 in which the reinforcing plate 10 is embedded is constructed so as to be connected to the foundation structure such as foundation beams and footings. After that, a column base 6 is installed and fixed on the column foundation 1 via anchor bolts 5 .

When a horizontal external force such as an earthquake force acts on the column base 6, the anchor bolts 5 that connect the column base 6 to the column foundation 1 are deformed by shear force or the like. Due to the deformation of the anchor bolts 5 , a force that pushes the concrete toward the outer surface 3 a of the column-shaped concrete body 3 is generated in the column-shaped concrete body 3 .

At this time, in the reinforcement structure of the column foundation for the exposed column base according to the present embodiment, between the anchor bolt 5 and the outer surface 3a of the column concrete body 3, the hoop reinforcement 4A from the uppermost stage to the third Since a plurality of reinforcing plates 10 are provided by being inscribed in a plurality of hoop reinforcements 4 over the hoop reinforcements 4 of the stage and corresponding to each anchor bolt 5 one by one, breakage is prevented. In the vicinity of the upper part of the column-shaped concrete body 3, which is likely to be generated, each reinforcing plate 10 corresponding to each anchor bolt 5 acts on the plurality of hoop reinforcements 4 against the force acting to push out the concrete due to the deformation of the anchor bolt 5. It can reliably resist while transmitting and distributing force.

Accordingly, excellent resistance to deformation of the anchor bolts 5 can be ensured without increasing the size of the column foundation 1 by increasing the amount of reinforcing bars, etc., and the cone-shaped failure of the column concrete body 3 can be appropriately suppressed. be able to.

Since the plate surface 10a of the reinforcing plate 10 abuts on the hoop reinforcement 4 from the side of the anchor bolt 5, the reinforcement plate 10 can be prevented from being extruded outside the hoop reinforcement 4, and the concrete is pushed out. can be effectively suppressed.

Each reinforcing plate 10 is provided so as to hide each anchor bolt 5 from the outer surface 3a of the concrete column 3 in the direction orthogonal to the outer surface 3a of the concrete column 3 (M ), the reinforcing plate 10 can receive almost all the force that the concrete receives due to the deformation of the anchor bolts 5, and can accurately and reliably suppress the pushing action of the concrete.

Since the dimension W of the reinforcing plate 10 in the width direction is equal to or larger than the outer diameter dimension D of the anchor bolt 5, the pressure receiving surface against the extrusion of concrete due to the deformation of the anchor bolt 5 can be reliably set and secured on the reinforcing plate 10. can.

The dimension L in the vertical height direction of the reinforcing plate 10 is set so that the hoop reinforcement 4A of the uppermost stage touches the hoop reinforcement 4 of the third stage below, so that the anchor bolts 5 with a large amount of displacement due to the horizontal external force are set. It is possible to effectively reinforce the upper portion of the columnar concrete body 3, which is close to the upper end portion 5a of the columnar concrete body 3 and therefore tends to cause cone-shaped failure.

The reinforcing plate 10 is arranged at the corner 3b of the pillar-shaped concrete body 3 and in the vicinity thereof to face both the pair of outer surfaces 3a of the pillar-shaped concrete body 3. is provided between the anchor bolt 5 and the outer surface 3a whose separation distance is shorter (see jx and ky in the figure), so the concrete thickness between the anchor bolt 5 and the outer surface 3a of the column concrete body 3 is thin. Therefore, it is possible to accurately reinforce a portion where cone-shaped fracture is likely to occur.

Since the reinforcing plate 10 is formed with hooks 11 for hooking onto the hoop bars 4A on the uppermost stage from above, it is possible to facilitate the installation work to inscribe the plurality of hoop bars 4 when attaching the reinforcing plate 10. .

FIG. 2 shows a reinforcing structure for a column foundation for an exposed column base according to the second embodiment. FIG. 2(A) is a cross-sectional plan view of the column foundation, and FIG. 2(B) is a cross-sectional view taken along line QQ in FIG. 2(A). Configurations different from the first embodiment will be described below. In the exposed column base column foundation 1 according to the present embodiment, a total of eight anchor bolts 5 are arranged in the same manner as in the first embodiment, but the arrangement positions are different.

In the second embodiment, four anchor bolts 5 are provided corresponding to the four corners 3b of the column concrete body 3, and the remaining four anchor bolts 5 are provided between adjacent anchor bolts 5. of anchor bolts 5 are provided.

In the second embodiment as well, the reinforcement plate 10 includes each anchor bolt 5 and the anchor bolt 5 in order to suppress the deformation of the anchor bolts 5, which pushes the concrete toward the outer surface 3a of the column-shaped concrete body 3. is provided between the outer surface 3a of the pillar-shaped concrete body 3 facing.

As in the case of the second embodiment, when the anchor bolts 5 are arranged at the corners 3b of the column concrete body 3, the anchor bolts 5 at the corners 3b constitute the corners 3b. It faces the pair of outer surfaces 3a at an equal distance (indicated by nxy in the drawing).

As already mentioned above, in this case, for each of the four anchor bolts 5 in every corner 3b, two reinforcing plates 10 are arranged between the anchor bolt 5 and each of the pair of outer surfaces 3a. is set. That is, in this case, two reinforcing plates 10 are provided for one anchor bolt 5 at a ratio of 1:2. Therefore, in the second embodiment, twelve reinforcing plates 10 are provided for eight anchor bolts 5 .

In the second embodiment, the reinforcing plate 10 is formed with a vertical height dimension L extending from the uppermost hoop reinforcement 4A to the fifth lower hoop reinforcement 4A.

In the second embodiment, when the separation distance between the pair of outer surfaces 3a at the corner 3b of the column concrete body 3 and the anchor bolts 5 is equal, the concrete is pushed out toward any of the outer surfaces 3a. The plate 10 can reliably resist. In addition, it goes without saying that the second embodiment also has the same effects as those of the first embodiment.

FIG. 3 shows a modification of the first and second embodiments. FIG. 3 is a partially broken side cross-sectional view of a column foundation.

The configuration different from the first and second embodiments will be described below. In the reinforcing plate 10, concrete to be poured to construct the column-shaped concrete body 3 is efficiently spread around the plate surface 10a of the reinforcing plate 10. For filling, a plurality of holes 12 are provided through the reinforcing plate 10 in the plate thickness direction to allow the poured concrete to flow.

The holes 12 for pouring concrete can improve the adhesion of the concrete to the reinforcing plate 10, and even if the holes 12 are formed in this way, the deformation of the anchor bolts 5 effectively pushes out the concrete. can be suppressed to

4 and 5 show other modifications of the first and second embodiments. FIG. 4(A) is a cross-sectional plan view of a column foundation, FIG. 4(B) is a cross-sectional view taken along line RR in FIG. 4(A), and FIG. 5 is used in this modification. A partial perspective view of the reinforcing plate is shown.

A configuration different from the first and second embodiments will be described below. The reinforcement plate 10 is integrally provided with a reinforcement rib 13 that enhances the rigidity of the reinforcement plate 10 itself. The reinforcing ribs 13 are plate-shaped, and a pair of reinforcing ribs 13 are provided on both edges in the width direction of the reinforcing plate 10 so as to rise from the plate surface 10a and extend over the entire length of the reinforcing plate 10 in the vertical height direction. A reinforcing plate 10 including a pair of reinforcing ribs 13 is formed to have a U-shaped flat cross section.

The reinforcing ribs 13 may be formed by bending the reinforcing plate 10 or may be formed by welding a strip-like plate material to the edge of the reinforcing plate 10 . Further, the reinforcing rib 13 may be provided only at one edge portion in the width direction of the reinforcing plate 10 or at an intermediate portion in the width direction. The reinforcing plate 10 including the reinforcing ribs 13 may be a section steel such as a channel steel, a light channel steel, a lip channel steel, an equilateral angle steel, a CT section steel, or the like. The reinforcement plate 10 is provided with respect to the hoop reinforcement 4 so that the reinforcement rib 13 faces the anchor bolt 5 side.

The reinforcing ribs 13 can increase the rigidity of the reinforcing plate 10 itself and also improve the adhesion to the placed concrete. effect can be effectively suppressed.

6 and 7 show still another modification of the first and second embodiments. FIG. 6(A) is a cross-sectional plan view of a column foundation, FIG. 6(B) is a cross-sectional view taken along line SS in FIG. 6(A), and FIG. 7 is used in this modification. A partial perspective view of the reinforcing plate is shown.

A configuration different from the first and second embodiments will be described below. The reinforcing plate 10 is integrally provided with a connecting portion 14 that connects the adjacent reinforcing plates 10 . In the illustrated example, the connecting portion 14 has a length dimension covering the entire length in the vertical height direction of the reinforcing plate 10 and is grooved so as to avoid the rising streaks 2 positioned between the adjacent reinforcing plates 10 . is composed of a molded C-shaped channel material 14a.

The widthwise edges of a pair of adjacent reinforcing plates 10 are integrally joined to the widthwise both edges of the C-shaped channel material 14a by welding or the like. In the illustrated example, the reinforcement plate 10 is formed with holes 12 for flowing the placed concrete. The connecting portion 14 may be formed integrally with the reinforcing plate 10 by bending the reinforcing plate 10 or the like.

With the connecting part 14, two reinforcing plates 10 can be provided on the hoop reinforcement 4 at the same time in one operation, so that workability can be improved, and the reinforcing plate 10 can be reinforced by the connecting part 14. .

FIG. 8 shows a side view of a modification of the reinforcing plate applicable to the above embodiments and modifications.

In FIG. 8A, the reinforcing plate 10 and the hook piece 11b are formed with the same length dimension. In FIG. 8(B), the bent portion 11a of the hook 11 is set at a midway position in the vertical height direction of the reinforcing plate 10, and the hook 11 is hung on the hoop reinforcement 4 other than the hoop reinforcement 4A of the uppermost stage. It is made possible.

In FIG. 8C, the reinforcing plate 10 is formed in a corrugated plate shape in which rib-shaped projections 15 are formed in multiple stages to separate the hoop bars 4 in the vertical height direction, and these rib-shaped projections 15 are The reinforcing plate 10 can be arranged between the vertically adjacent hoop bars 4, and the reinforcing plate 10 can be reinforced in the form of a corrugated plate.

Furthermore, as another modification of the above configuration in which a reinforcing plate 10 is arranged between the anchor bolt 5 and the outer surface 3a of the column concrete body 3 and disposed inside the hoop reinforcement 4, T is applied to each anchor bolt. A letter-shaped reinforcing plate may be used, the reinforcing plate being in contact with the riser bar and provided between the riser bar and the anchor bolt.

In this case, the T-shaped reinforcing plate reliably resists the force acting to push out the concrete by deformation of the anchor bolt, while transmitting the force to the plurality of hoop muscles via the rising muscles and distributing it. can do.

9 to 12 show various specific examples of the T-shaped reinforcing plate that is brought into contact with the rising muscle 2. FIG. In either embodiment, the T-shaped reinforcing plate 10 is constructed of C-shaped channel steel having ribs 16b, 17b on both side edges of flat plates 16a, 17a.

Instead of channel steel, the ribs 16b and 17b may be welded to the flat plates 16a and 17a, whereby the reinforcing plate 10 having an arc shape or the like can be formed.

9 and 10 show a first example using channel steels 16 and 17, in which FIG. A) is a cross-sectional view taken along line TT in the middle. FIG. 10 is a perspective view showing how the channel steels 16 and 17 are assembled.

On one side of the column foundation 1, three horizontal channel steels 17 are welded to each rib 16b on the sides of the two longitudinal channel steels 16 corresponding to the two anchor bolts 5, respectively, Longitudinal channels 16 are connected to the column foundation 1 in the circumferential direction. This is a structure in which two T-shaped reinforcing plates 10 are integrated via a central transverse channel steel 17 .

Both the groove 17c of the transverse channel 17 and the groove 16c of the longitudinal channel 16 face the anchor bolt 5 side. Hooks 11 hooked on hoop bars 4 are welded to flat plates 16 a of longitudinal channel steel 16 .

FIG. 11 is a view of the longitudinal channel steel 16 in FIG. A reinforcement plate 18 is welded in the groove 16c of the groove 16 so as to match the position of the rib 17b of the lateral channel steel 17, thereby increasing the rigidity.

FIG. 12 is a second example using channel steels 16 and 17, and is a perspective view showing how the channel steels 16 and 17 are assembled. In the second example, on one side of the column foundation 1, two vertical channel steels 16 are welded to the bottom rib 17b of one horizontal channel steel 17 along this. The hook 11 is welded to the transverse channel steel 17 .

Even if channel steels 16 and 17 are used for the reinforcing plate 10 and installed so as to contact the rising bars 2 from the inside thereof, the same effects as those of the above-described embodiments can of course be obtained.

Of course, even the modified examples variously described above can achieve the effects of the above-described embodiment.

Reference Signs List 1 column foundation 2 rising bar 3 column concrete body 3a outer surface of column concrete body 3b corner of column concrete body 4 hoop bar 4A uppermost hoop bar 5 anchor bolt 6 exposed column base 10 reinforcing plate 10a Plate surface of reinforcing plate 11 Hook 12 Hole for pouring concrete 13 Reinforcing rib 14 Connecting part 15 Rib-shaped convex part D Outer diameter dimension of anchor bolt L Vertical dimension of reinforcing plate W Width direction of reinforcing plate the dimensions of

Claims (11)

In the column-shaped concrete body, a plurality of risers are arranged in a circular arrangement along the vertical height direction, and a ring is formed surrounding the outer periphery of these risers, and the risers are multi-staged in the vertical height direction. A plurality of hoop reinforcements arranged in the pillar-shaped concrete body and a plurality of anchor bolts positioned inwardly of the rising reinforcements and arranged in an annular array are embedded, and the anchor bolts are embedded on the column-shaped concrete body. A column foundation on which an exposed column base is installed and fixed,
Between the anchor bolts and the outer surface of the column-shaped concrete body, the anchor bolts are arranged inside the plurality of hoop reinforcements from the uppermost hoop reinforcement to the lower hoop reinforcement, and each of the anchor bolts is individually attached to the column. A reinforcing structure for a column foundation for an exposed column base, characterized in that a reinforcing plate is provided so as to cover the outer surface of the column concrete body in a direction perpendicular to the outer surface of the concrete concrete body. 2. The reinforcing structure of a column foundation for an exposed column base according to claim 1, wherein the plate surface of the reinforcing plate abuts against the hoop reinforcement from the anchor bolt side. 3. The reinforcing structure of a column foundation for an exposed column base according to claim 1, wherein a plurality of said reinforcing plates are provided individually corresponding to each of said plurality of anchor bolts. The exposed-type column base according to any one of claims 1 to 3, wherein the width dimension of the reinforcing plate along the circumferential direction of the hoop reinforcement is equal to or greater than the outer diameter dimension of the anchor bolt. Reinforcement structure of column foundation. 2. A dimension of the reinforcing plate in a vertical height direction along the length direction of the rising bar is set so as to be in contact with at least the hoop bar on the uppermost stage and the hoop bar directly below it. 4. A reinforcing structure for a column foundation for an exposed column base according to any one of items 1 to 4. The column-shaped concrete body has a rectangular cross-section, and the reinforcing plates are arranged at the corners of the column-shaped concrete body to face the pair of outer surfaces of the column-shaped concrete body. The column foundation for an exposed column base according to any one of claims 1 to 5, characterized in that it is provided between one of the outer surfaces having a short separation distance from the anchor bolt and the anchor bolt. reinforced structure. Reinforcement of column foundation for exposed column base according to any one of claims 1 to 6, characterized in that the reinforcing plate is formed with a hook for hanging on the hoop reinforcement on the uppermost stage from above. structure. The reinforcing structure of a column foundation for an exposed column base according to any one of claims 1 to 7, characterized in that the reinforcing plate is provided with holes for flowing the placed concrete. The reinforcing structure of a column foundation for an exposed column base according to any one of claims 1 to 8, wherein the reinforcing plate is provided with reinforcing ribs. The reinforcing structure of a column foundation for an exposed type column base according to any one of claims 1 to 9, wherein the reinforcing plates are provided with connecting portions that connect the reinforcing plates adjacent to each other . The reinforcing plate is formed in the shape of a corrugated plate having rib-shaped protrusions formed in multiple stages in the vertical direction, and the rib-shaped protrusions are arranged between the hoop muscles that are vertically adjacent to each other. The reinforcing structure for a column foundation for an exposed column base according to any one of claims 1 to 10.

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