JP5609818B2 - Reinforcement method of column base of existing assembly column and reinforcement structure of column base of existing assembly column - Google Patents

Description

  The present invention relates to a method for reinforcing a column base of an existing assembly column and a structure for reinforcing a column base of an existing assembly column.

In structures such as buildings, column bases are structurally important parts for transmitting the vertical force of the upper frame to the foundation and for withstanding horizontal forces due to seismic loads or wind loads. And the structure of the column base part aiming at the increase in the intensity | strength of a column base part, or the simplification of construction, the hardware used for a column base part, etc. are known (for example, patent document 1 and 2).
Further, an assembly column including a plurality of column members standing on a foundation formed of concrete via a base plate and a plurality of diagonal members connecting the plurality of column members is conventionally known.

JP-A-5-339992 JP 2005-344289 A

By the way, if the upper frame of an existing structure is remodeled or the load on the upper frame is increased, the stress acting on the column base will increase, so the column base will be reinforced to cope with this increased stress. May be required.
However, the structure of the column base and the hardware used for the column base as disclosed in Patent Document 1 and Patent Document 2 are used for the column base of a newly erected column. It is not considered to be used to reinforce the column base of this column.

For this reason, when an assembly column is used in an existing structure, methods for reinforcing the column base of the existing assembly column include a method of performing a concrete wrap around the column base, a base plate and a foundation part. A method of increasing the number of post-installed anchor bolts is known.
However, in the method in which the concrete is wound around the column base of the existing assembly column, a space is required around the column base, and this equipment is installed when equipment is installed around the column base. There is a problem that it is necessary to move, etc., and it takes time for construction.

  In addition, in the method in which post-installed anchor bolts are added to the base plate and the foundation part, the concrete surrounding the post-installed anchor may cause cone-like fracture due to insufficient concrete strength of the foundation, or the out-of-plane strength of the base plate may be insufficient. There is a fear. Also in this method, there is a problem that a space is required around the column base part, and when equipment or the like is installed around the column base part, it is necessary to move it and it takes a lot of work.

  The present invention has been made in view of the above-described problems, and a method for reinforcing a column base of an existing assembly column and a reinforcement of the column base of an existing assembly column that can easily and reliably reinforce the column base. The purpose is to provide a structure.

In order to achieve the above object, a method for reinforcing a column base portion of an existing assembly column according to the present invention includes a base plate disposed on an upper portion of a foundation formed of concrete, and a standing plate disposed on an upper portion of the base plate in a horizontal direction. Reinforcement of column base portions of existing assembly columns including a plurality of column members arranged at intervals and forming a space in the arrangement, and a plurality of lattice members arranged between the adjacent column members. A hole forming step of forming a hole by vertically drilling the base plate and the foundation in the inside of the array of the plurality of pillars; and inserting a reinforcing steel material into the hole and vertically A reinforcing steel material installation step extending in the direction and projecting the upper end portion of the reinforcing steel material upward from the base plate, and the height of the upper end portion of the reinforcing steel material inside the hole and the plurality of pillar members Filler up to height above And a filling material filling step of filling, the reinforcing steel, H-section steel, angle steel is either Mizokatachiko, the reinforcing steel material placing step, the surface of the flange of the reinforcing steel Is installed so as to be in a direction orthogonal to the direction between the beams of the existing structure having the existing assembly pillars .

Further, the reinforcing structure of the column base portion of the existing assembly column according to the present invention is the base plate disposed on the upper part of the foundation made of concrete, and is erected on the upper part of the base plate and spaced apart from each other in the horizontal direction. A reinforcement structure for a column base portion of an existing assembly column comprising a plurality of column members arranged and forming a space inside the array, and a plurality of lattice members arranged between the adjacent column members, Inside the arrangement of the plurality of pillar members, a hole that vertically penetrates the base plate and extends in the vertical direction on the foundation, and is inserted into the hole and extends in the vertical direction, and an upper end portion thereof extends from the base plate. also it includes a reinforcing steel material projecting upwardly, and a filler which is filled up to a height above the height of the upper end portion of the reinforcing steel within the sequence of the holes and the plurality of pillar, the reinforcement Steel for use is H Steel, angle steel, are either Mizokatachiko, characterized in that it is installed such that the direction in which the surface of the flange is perpendicular to Harima direction of the existing structure with the existing assembly pillars.

In the present invention, the reinforcing steel material is integrated with the foundation and the column material by the filler, and it is possible to bear a part of the external force acting on the column base of the assembly column. Can be reinforced.
In particular, a part of the bending moment acting on the column base portion of the assembly column can be borne by the bending resistance force of the reinforcing steel material. Further, a part of the shearing force acting on the column base portion of the assembly column can be borne by the shearing resistance force of the reinforcing steel material. Part of the axial force acting on the column base of the assembled column is borne by the adhesion force and friction force between the reinforcing steel and the filler, and the adhesion force and friction force between the column material and the filler. can do.
In addition, there is no work to be done from the four sides of the column base such as root winding of concrete or additional hitting of anchor bolts around the column base of the existing assembly column as before, so there is no equipment around the column base. Even if such as is installed, it can be easily constructed without moving this equipment.

Moreover, in the reinforcement method of the column base part of the existing assembly column which concerns on this invention, it is preferable to connect the said steel material for reinforcement to the said column material via a connection member.
By doing in this way, since the reinforcing steel plate and the column material are reliably integrated, the reinforcing steel material can reliably bear a part of the external force acting on the column base.

Moreover, in the reinforcement method of the column base part of the existing assembly column which concerns on this invention, it is preferable that the projection part is formed in the surface of the said steel material for reinforcement.
Moreover, in the reinforcement method of the column base part of the existing assembly column which concerns on this invention, it is preferable that the said protrusion part is any one or more of the stat gibel fixed to the said steel material for reinforcement, a reinforcing bar, and a rib.
By doing so, since the reinforcing steel material and the filler are reliably integrated, the reinforcing steel material can reliably bear a part of the external force acting on the column base.

According to the present invention, since the reinforcing steel material is integrated with the foundation and the column material and can bear a part of the external force acting on the column base part of the assembly column, the column base part of the assembly column is reliably reinforced. be able to.
In addition, there is no work to be done from the four sides of the column base, such as concrete winding around the column base and additional anchor bolts, as in the past, so facilities are installed around the column base. Even if it is, it can be easily constructed without moving this equipment.

(A) is an elevation which shows an example of the existing building by 1st Embodiment of this invention, (b) is the sectional view on the AA line of (a). (A) is a figure which shows an example of the reinforcement structure of the column base part of the existing assembly pillar by 1st Embodiment of this invention, (B) BB sectional drawing, (b) is CC of (a). It is line sectional drawing. (A) is a figure which shows an example of the position adjustment mechanism of the reinforcing steel materials, and is DD sectional view taken on the line of (b), (b) is FF sectional view taken on the line of (a). It is a figure which shows an example of the reinforcement structure of the column base part of the existing assembly pillar by 2nd Embodiment of this invention. It is a figure which shows an example of the reinforcement structure of the column base part of the existing assembly pillar by 3rd Embodiment of this invention.

(First embodiment)
Hereinafter, the reinforcement structure of the column base part of the existing assembly pillar by 1st Embodiment of this invention is demonstrated based on FIG. 1 thru | or FIG.
As shown in FIG. 1 (a), the reinforcement structure of the column base portion of the existing assembly column according to the first embodiment is constructed with a frame structure in the beam-to-beam direction (in the direction of arrow A in the drawing) with a ramen structure. This is a structure for reinforcing the column base portion 12a of the assembly column 12 constituting the existing building 11 in which the frame in the horizontal direction orthogonal to the beam-to-beam direction is constructed with a brace structure.

The assembly column 12 of the existing building 11 includes a base plate 14 disposed on an upper portion of a concrete foundation 13 embedded in the ground, a plurality of column members 15 erected on the upper portion of the base plate 14, and adjacent column members. And a plurality of lattice members 16 disposed between the plurality of lattice members 16.
The foundation 13 is formed in a predetermined size capable of supporting the existing building 11, and a pile is buried below as needed.
As shown in FIGS. 1A and 1B, the base plate 14 is a steel plate installed in contact with the upper end surface 13 a of the foundation 13, and is fixed to the foundation 13 by a plurality of anchor bolts 17.

As shown in FIG. 1 (a), the plurality of column members 15 are composed of four angle steels and are arranged at predetermined intervals so as to be located at respective corners of a substantially rectangular shape in plan view. Yes. A space is formed inside the plurality of column members 15.
The column member 15 may be fixed to the base plate 14 by welding, or may be fixed with a fastener such as a bolt via an angle member (not shown).
The lattice material 16 is composed of a shaped steel, a long steel plate, or the like, and is arranged in a zigzag shape in the vertical direction along the column material 15.

  As shown in FIGS. 2A and 2B, the column base reinforcement structure 1A of the existing assembly column according to the present embodiment penetrates the base plate 14 in the vertical direction inside the array of the plurality of column members 15. A hole 2 extending in the vertical direction is formed in the concrete foundation 13, and a plurality of accessory plates 3 that block the space on the lower side of adjacent column members 15, and extending in the vertical direction and inserted into the hole 2. For example, a reinforcing steel material 4 such as an H-shaped steel material and a filler 5 filled inside the hole 2 and the plurality of accessory plates 3 are provided.

The hole 2 is formed in a shape in which one end (lower end 4b) side in the extending direction of the reinforcing steel material 4 can be inserted. In the present embodiment, the hole 2 is composed of a cylindrical first hole 21 and a second hole 22 that partially overlap each other. The first hole 21 and the second hole 22 are each formed by core boring. After the first hole 21 is formed, the second hole 22 is partially overlapped with the first hole 21. The hole 2 is formed by forming.
The hole 2 may be a single cylindrical hole or any other shape as long as the lower end 4b side of the reinforcing steel material 4 can be inserted. The hole 2 may be formed by a method other than core boring.

The accessory plate 3 is a steel plate having a predetermined height, and both end portions 3c (see FIG. 2A) are fixed to the column member 15 by a fixing tool (not shown) such as a bolt, and the lower end portion 3b (FIG. 2). (See (b)) is fixed to the base plate 14 without a gap. Further, the attachment plate 3 and the lattice material 16 (see FIG. 2B) are configured not to interfere with each other, and the lattice material 16 is disposed above the upper end portion 3a of the attachment plate 3.
In addition, when the attachment plate 3 and the lattice material 16 interfere, the lattice material 16 of the interference part is removed and the attachment plate 3 is installed. At this time, when the strength of the assembly column 12 is reduced by removing the lattice material 16, reinforcement is performed.
In the present embodiment, the accessory plate 3 is composed of four steel plates that block the intervals between adjacent column members 15.

The reinforcing steel material 4 is formed in such a length that the lower end portion 4 b is positioned at the bottom portion 2 b of the hole portion 2 and the upper end portion 4 a protrudes upward from the base plate 14.
In the present embodiment, the reinforcing steel material 4 is installed such that the flange 4c is in a direction orthogonal to the inter-beam direction (the direction of arrow A in the figure).

The filler 5 is filled with, for example, concrete, mortar, or the like between the inner peripheral surface of the hole 2 and the inner peripheral surface of the accessory plate 3 and the outer peripheral surface of the reinforcing steel material 4. The filler 5 is filled inside the hole 2 and the plurality of accessory plates 3 so that the reinforcing steel material 4 is embedded in the filler 5, and the reinforcing steel material 4, the concrete foundation 13, and the assembly column 12 It is integrated.
In the present embodiment, the hoop bars 6 are disposed around the reinforcing steel material 4 above the base plate 14 and embedded in the filler 5. The hoop muscle 6 may not be installed.

Next, the reinforcement method of the column base part of the existing assembly pillar mentioned above is demonstrated using drawing.
(Hole formation process)
First, the hole 2 for inserting the reinforcing steel material 4 into the base plate 14 and the base 13 is formed.
The hole 2 is formed by core boring, and the lower base 13 is continuously drilled after passing through the base plate 14 from above.
In the present embodiment, the cylindrical first hole portion 21 is formed by core boring, and then the cylindrical second hole portion 22 is formed by core boring so as to partially overlap the first hole portion. Thereby, the hole 2 for inserting the reinforcing steel material 4 is formed.
In the hole forming step, when the core boring device and the lattice material 16 interfere with each other, the interfering lattice material 16 is removed and the hole forming step is performed.

(Steel installation process for reinforcement)
Subsequently, the reinforcing steel material 4 is installed in the hole 2.
The lower end 4 b side of the reinforcing steel material 4 is inserted into the hole 2, and the upper end portion 4 a of the reinforcing steel material 4 is protruded upward from the base plate 14.
At this time, the position of the reinforcing steel material 4 with respect to the hole 2 and the column material 15 is adjusted.
Then, around the portion of the reinforcing steel material 4 that protrudes above the base plate 14, a plurality of hoop bars 6 are installed at intervals in the vertical direction.

The position adjustment of the reinforcing steel material 4 with respect to the hole 2 and the pillar material 15 can be performed using, for example, a reinforcing steel material positioning mechanism 30 as shown in FIGS. 3 (a) and 3 (b).
In the position adjustment of the reinforcing steel material 4 with respect to the hole 2 and the column member 15, the outer surfaces of the pair of flanges 4c and 4c of the reinforcing steel material 4 are arranged in the substantially same plane as the web 4d and protrude outward. While a pair of 1st plates 31 and 31 are joined, a pair of 2nd plates 32 and 32 arranged in parallel with the 1st plates 31 and 31 are joined to foundation 13.
At this time, bolt holes 33 and 34 are formed in the first plate 31 and the second plate 32, respectively, and the first plate 31 and the second plate 32 can be joined by the bolt 35 and the nut 36. Yes. Moreover, the bolt hole 33 of the 1st plate 31 is formed in the shape of a long hole extended in an up-down direction, and the bolt hole 34 of the 2nd plate 32 is formed in the normal circular shape.

When the position of the reinforcing steel material 4 is adjusted, the reinforcing steel material 4 inserted in the hole 2 is moved and arranged at a desired position, and the bolt holes 33 and 34 of the first plate 31 and the second plate 32 are moved. A bolt 35 is inserted through the nut 35 and fastened with a nut 36.
At this time, the first plate 31 can be joined to the second plate 32 at a desired height by forming the bolt holes 33 of the first plate 31 in a long hole shape extending in the vertical direction.
When the reinforcing steel material 4 is disposed at a desired position, if the first plate 31 and the second plate 32 are separated from each other, a washer (not shown) is provided between the first plate 31 and the second plate 32. Etc.) can be joined in a state where the first plate 31 and the second plate 32 are separated from each other.
Thereby, the position of the reinforcing steel material 4 is fixed at a desired position.

The bolt hole 33 of the first plate 31 has a circular shape larger than the bolt hole 34 of the second plate 32 instead of the long hole shape, and can be adjusted not only in the vertical direction but also in the horizontal direction. It may be.
The first plate 31 is formed with a long hole-shaped bolt hole 33 extending in the vertical direction, and the second plate 32 is formed with a long hole-shaped bolt hole 34 extending in the horizontal direction. The position of the reinforcing steel material 4 in the vertical direction and the horizontal direction may be adjusted by inserting the bolts 35 through the overlapping portions 33 and 34.

(Attachment plate installation process)
Subsequently, the attachment plate 3 is installed.
While fixing the lower end part 3b of the attachment board 3 with the base plate 14 without gap, the attachment board 3 is installed so that the space | interval of the adjacent pillar material 15 may be block | closed.
In the present embodiment, the reinforcing plate 3 is attached when the column base 12a of the assembly column 12 is reinforced, but when the auxiliary plate 3 is attached to the column base 12a of the existing assembly column 12, Using this attachment plate 3, the attachment plate installation step may be omitted.

(Filler filling process)
Subsequently, the filler 5 is filled inside the hole 2 and the attachment plate 3. And the reinforcing steel material 4 is integrated with the foundation 13 and the column material 15 by hardening the filler 5.

In the column base reinforcement structure 1A of the existing assembly column according to the present embodiment described above, when a bending moment is generated in the column base 12a, the pull-out resistance force of the anchor bolt 17 and the support pressure of the base plate 14 against the bending moment. In addition, it is resisted by the bending resistance of the reinforcing steel material 4.
Further, when a shearing force is generated in the column base part 12a, the column base part 12a is resisted by the shearing resistance of the reinforcing steel material 4 in addition to the frictional force between the base plate 14 and the foundation 13 and the shearing resistance of the anchor bolt.
Further, when an axial force is generated in the column base 12a, in addition to the pulling-out force of the anchor bolt 17 and the support pressure of the base plate 14, the adhesion force and frictional force of the reinforcing steel material 4 and the filler 5, and the column material 15 and the filler It resists by the adhesive force and frictional force with 5.
For this reason, the dimensions of each part of the reinforcing steel material 4, the depth dimension of the hole 2, the dimension in which the reinforcing steel material 4 protrudes upward from the base plate 14, the height dimension of the accessory plate 3, and the like match the required strength. Are preferably set.

In the present embodiment, the existing building 11 is constructed with a frame structure in the direction between beams (in the direction of arrow A in the figure), and the reinforcing steel 4 has a flange 4c in the direction between the beams (in the arrow A in the figure). Therefore, the reinforcing steel material 4 can effectively resist the bending moment of the column base 12a in the vertical plane including the inter-beam direction. it can.
In general, since the bending moment acting in the beam-to-beam direction of the existing building 11 is larger than the bending moment acting in the beam direction, it can resist the bending moment of the reinforcing steel material 4 more effectively than the other ( For example, in this embodiment, the direction perpendicular to the flange 4c of the H-shaped steel and the direction in which the bending moment greater than the other can be resisted) and the direction in which the bending moment acting on the existing building 11 is greater than the others are matched. Thus, the existing building 11 can be efficiently reinforced.

Next, the effect of the reinforcement structure of the column base part of the existing assembly column mentioned above and the reinforcement method of the column base part of the existing assembly column will be described.
According to the reinforcing structure 1A for the column base of the existing assembly column and the method for reinforcing the column base of the existing assembly column according to the present embodiment, a part of the external force acting on the column base 12a of the assembly column 12 is used as the reinforcing steel material 4. Therefore, the column base portion 12a of the assembly column 12 can be reinforced.
In addition, since there is no concrete wrapping around the column base 12a and additional anchor bolt 17 hitting as in the prior art, it is easy even when equipment is installed around the column base 12a. Construction can be performed.

  Further, since the reinforcing steel material 4 is an H-shaped steel, the first hole portion 21 and the second hole portion 22 are each slightly larger than the width dimension of the flange 4c of the reinforcing steel material 4 as shown in FIG. By making the diameter large and part of the first hole portion 21 and the second hole portion 22 overlap each other, the hole portion 2 into which the reinforcing steel material 4 can be inserted is formed. Thereby, since the 1st hole part 21 and the 2nd hole part 22 can be made into a small diameter, it is not necessary to use a large sized apparatus in order to form the 1st hole part 21 and the 2nd hole part 22. The location where the lattice material 16 (see FIG. 2B) is removed when forming the hole 2 can be minimized.

(Second Embodiment)
Next, other embodiments will be described with reference to the accompanying drawings, but the same or similar members and parts as those of the above-described embodiments will be denoted by the same reference numerals, and description thereof will be omitted. To do.
As shown in FIG. 4, in the reinforcing structure 1 </ b> B of the column base portion of the existing assembly column according to the second embodiment, the reinforcing steel material 4 and the column material 15 of the assembly column 12 are connected by a connection member 23.
The connecting member is a shaped steel, a steel plate or the like, and is connected to the reinforcing steel material 4 and the column material 15 of the assembly column 12 so as to connect both.
In the reinforcing method of the column base portion of the assembly column according to the second embodiment, the connecting member 23 is installed between the reinforcing steel material 4 and the column material 15 in the reinforcing steel material installation step.

  In the reinforcing structure 1B for the column base of the existing assembly column and the method for reinforcing the column base of the assembly column according to the second embodiment, the same effect as that of the first embodiment is achieved, and the reinforcing steel material 4 and the assembly column 12 are provided. Since it integrates reliably, a part of external force which acts on the column base part 12a can be borne reliably.

(Third embodiment)
As shown in FIG. 5, in the reinforcing structure 1 </ b> C of the column base portion of the existing assembly column according to the third embodiment, a stud divel (projection portion) 24 is attached to the surface of the reinforcing steel material 4. The stud gibber 24 may be previously attached to the reinforcing steel material 4 at a factory or the like, or may be attached to the reinforcing steel material 4 at the site.

  In the reinforcing structure 1C of the column base part of the existing assembly column according to the third embodiment, the same effect as that of the first embodiment is obtained, and the reinforcing steel material 4 and the filler 5 are reliably integrated with each other. The reinforcing steel material 4 can reliably bear a part of the external force acting on 12a.

As mentioned above, although embodiment of the reinforcement structure 1A-1C of the column base part of the existing assembly column and the reinforcement method of the column base part of the existing assembly column by this invention was described, this invention is not limited to said embodiment. However, it can be changed as appropriate without departing from the spirit of the invention.
For example, in the above-described embodiment, the assembly column 12 is composed of four angle steels in which the column material 15 is four, but the number and the shape of the column material 15 may be other than this. For example, adjacent flanges with a predetermined interval are provided. It is good also as a structure provided with the H-section steel installed so that it may distribute in parallel, and the lattice material 16 fixed to the flange of the adjacent H-section steel.
In the above-described embodiment, the reinforcing steel material 4 is an H-shaped steel, but may be an angle steel, a grooved steel, a steel pipe, or the like instead of the H-shaped steel. And even when angle steel or channel steel is used for the reinforcing steel material 4, the direction in which it can effectively resist the bending moment of the reinforcing steel material 4 and the bending moment acting on the existing building 11 are larger than others. By matching the direction, the existing building 11 can be efficiently reinforced.
Moreover, in 3rd Embodiment mentioned above, although the stud gibel 24 is provided in the surface of the steel material 4 for reinforcement, you may provide a reinforcing bar, a rib, etc. on the surface of the steel material 4 for reinforcement instead of the stud gibel 24, It is also possible to employ a protruding member that protrudes from the surface.

In the above-described embodiment, the attachment plate 3 is provided between the adjacent column members 15. However, when the attachment plate 3 is provided on the existing assembly column 12, the existing attachment plate 3 is used. Also good.
Further, instead of the support plate 3, a mold for the filler 5 may be installed outside the column member 15, and the mold 5 may be removed after the filler 5 is cured.
Further, in the above-described embodiment, the column base portion 12a of the assembly column 12 constituting the existing building 11 in which the frame structure between the beams is constructed with a ramen structure and the frame structure in the beam running direction is constructed with a brace structure is reinforced. However, you may reinforce the column base part 12a of the assembly pillar 12 of other existing structures.
Further, in the above-described embodiment, the inner side of the base plate 14 is arranged in the array of the column members 15, and the hole 2 that penetrates the base plate 14 and extends in the vertical direction is formed in the base plate 13. 14 does not need to be arranged inside the array of column members 15, and in such a case, the hole 2 may be formed only in the base 13.

DESCRIPTION OF SYMBOLS 1A, 1B, 1C Reinforcement structure of the column base part of the existing assembly pillar 2 Hole part 3 Substituting plate 4 Steel material for reinforcement 5 Filler material 6 Hoop reinforcement 11 Existing building 12 Assembly pillar 12a Column base part 13 Foundation 14 Base plate 15 Column material 16 Lattice material 23 Connecting member 24 Stud gibber (projection)
30 Steel Positioning Mechanism for Reinforcement 31 First Plate 32 Second Plate 33 Bolt Hole 34 Bolt Hole 35 Bolt 36 Nut

Claims (5)

A base plate arranged on top of a foundation made of concrete;
A plurality of pillars that stand on top of the base plate and are arranged at intervals in the horizontal direction to form a space inside the arrangement;
A plurality of lattice members disposed between adjacent column members, and a method for reinforcing a column base of an existing assembly column,
A hole forming step of forming a hole by vertically drilling the base plate and the foundation in the array of the plurality of pillar members;
A reinforcing steel material installation step of inserting a reinforcing steel material into the hole and extending in a vertical direction and projecting an upper end portion of the reinforcing steel material upward from the base plate;
A filler filling step of filling a filler to a height equal to or higher than a height of an upper end portion of the reinforcing steel material inside the hole and the plurality of pillar members ,
The reinforcing steel material is any one of H-shaped steel, angle steel, and channel steel,
In the reinforcing steel material installation step, the reinforcing steel material is installed such that the surface of the flange is oriented in a direction orthogonal to the beam-to-beam direction of the existing structure having the existing assembly column. How to reinforce the leg.   The method for reinforcing a column base portion of an existing assembly column according to claim 1, wherein the reinforcing steel material is connected to the column material via a connection member.   The method for reinforcing a column base portion of an existing assembly column according to claim 1, wherein a protrusion is formed on a surface of the reinforcing steel material.   The method of reinforcing a column base of an existing assembly column according to claim 3, wherein the protrusion is one or more of a stat gibber, a reinforcing bar, and a rib fixed to the reinforcing steel material. A base plate arranged on top of a foundation made of concrete;
A plurality of pillars that stand on top of the base plate and are arranged at intervals in the horizontal direction to form a space inside the arrangement;
A plurality of lattice members disposed between adjacent column members, and a reinforcing structure of a column base portion of an existing assembly column,
A hole extending vertically through the base plate and vertically extending through the base plate within the array of the plurality of pillars;
A reinforcing steel material inserted into the hole and extending in the vertical direction and having an upper end protruding upward from the base plate;
A filler filled up to a height equal to or higher than the height of the upper end portion of the reinforcing steel material in the hole and the array of the plurality of pillar members ;
The reinforcing steel material is any one of H-shaped steel, angle steel, and channel steel, and is installed so that the surface of the flange is perpendicular to the direction between the beams of the existing structure having the existing assembly column. reinforcing structure of columnar leg portion of the existing assembly column, characterized in that there.

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