JP3084027B1 - Pillar fixing structure - Google Patents

Abstract

An object of the present invention is to provide a column base fixing structure that can obtain a high degree of column base fixing with an inexpensive and simple structure using a general building steel frame material. SOLUTION: The structure is such that a column member 1 is rigidly fixed to a foundation, and comprises a base 2 which is a steel pipe material or an H-shaped steel which is embedded and fixed in the foundation, and a joining frame 3 which is joined to the column base 4 by welding. A column base fixing structure in which the base 2 and the joint frame 3 are assembled by fitting the engagement plate 6 of the frame 3 into the slit 9 provided in the base 2 and joined by simple means such as fillet welding or bolt joint. .

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a column base fixing structure for a steel structure.

[0002]

2. Description of the Related Art As a column base fixing structure of a steel structure, for example, JP-A-10-025798 and JP-A-10-046601 can be shown. Such a column base fixing structure has a mode in which a plate material called a base plate is joined to the column base, and is generally constructed as follows. Select a base plate and anchor bolt in advance according to the size of the pillar. The base plate is made of cast steel having an outer diameter considerably larger than that of the pillar, and has holes for anchor bolts. At the site, prior to construction, anchor bolts are arranged in a predetermined positional relationship. Then, an anchor bolt hole of the base plate which has been joined to the column base in advance by butt welding is inserted into the anchor bolt, and a nut is fastened to fix the column base. In addition, as shown in JP-A-07-238556, as shown in JP-A-11-043950, as shown in JP-A-11-043950, as shown in JP-A-11-043950, as a base structure, In some cases, a fixing hardware is pre-attached to the base structure, and a slit provided in advance in the column base is inserted into the fixing hardware and fixed.

[0003]

The base plate is an expensive member made of a special steel material, and causes a high cost of the entire column base fixing structure. In addition, the special steel material causes the following problem. As described above, the anchor bolts are arranged in a predetermined positional relationship prior to construction, but even if the positional relationship is correctly determined,
Since the reinforcing bars of the underground beams are assembled from all sides, the positional relationship between the anchor bolt holes of the base plate and the anchor bolts is shifted. In this case, the hole for the anchor bolt is slightly cut, but the thickness of the base plate and, above all, the hardness of the special steel material are harmed, and excessive labor and labor are required.

Japanese Patent Application Laid-Open No. H11-04395 which does not use a base plate
The No. 0 base structure eliminates such annoyances associated with the anchor bolt, but has a problem that the proposed base structure is complicated and mass production cannot be expected. Therefore, the main focus is on the ease of construction compared to the base plate, and the ease of solving the above-mentioned problems (the displacement between the anchor bolt holes and the anchor bolts) when using the base plate can be easily solved. Column base fixing structure with a high degree of column base fixing with an inexpensive and simple structure using steel frames
In order to provide (a column spring fixed structure with a large rotating spring constant),
investigated.

[0005]

Means for Solving the Problems] was developed result of the examination is, meet structures rigidly fixed to the pillar members to the foundation, and behenate over scan to secure embedded in foundation, bonding frame for fixing the column base in Ruhashiraashi fixed structure and a, the engaging portion protruding outward
The joint frame is fixed to the column base by welding, and the
Slit or notch to upper edge of base at position corresponding to joint
And an engagement receiving portion comprising:
This is a column base fixing structure in which the base and the joining frame are assembled and joined by being fitted into the portion . The combination of the engagement portion and the engagement receiving portion that form a pair includes an engagement plate and a slit (a relatively narrow cut) and an engagement block and a notch (a relatively wide groove). In the present invention, an H-shaped steel or a steel pipe material (square steel pipe or circular steel pipe) can be appropriately selected and used for each of the column member and the base, but the structure of the joining frame changes depending on the combination of each.

When the pillar is a square steel pipe, the base is a square or circular steel pipe larger than the pillar, and the joint frame is formed by an annular portion surrounding the pillar and an engaging portion projecting outward from the annular portion. The base is provided with a level adjuster on the lower edge of the base and an engagement receiving portion on the upper edge at a position corresponding to the engaging portion, and the annular portion of the joining frame fitted to the column material is butt-connected or The base and the joining frame are fixed by being fixed to the column base by fillet welding, and the engaging portion of the joining frame is fitted into the engaging receiving portion of the base, so that the fillet welding of the engaging portion and the engaging receiving portion is performed. The base and the joint frame are joined with. In the column base fixing structure, a form in which the joining plate protrudes from a corner of the annular portion is basically used. When the engaging portion projects from the middle of each side of the annular portion, the inner drum plate is attached to this pillar at a height corresponding to the fixing position of the joining frame on the pillar, and the position corresponding to the surface of the pillar, that is, the annular shape The engaging portion protrudes from the middle of each side of the portion.

If the column is a circular steel pipe, the base is a square or circular steel pipe larger than the column, and the joining frame is an annular portion surrounding the column and an engaging portion projecting radially from the annular portion. The base is provided with a level adjuster on the lower edge, an engagement receiving portion on the upper edge at a position corresponding to the engaging portion, and the annular portion of the joining frame fitted to the pillar is butted. Or, it is joined to the column base by fillet welding, the inner drum plate is attached to this column material at a height corresponding to the fixing position of the joining frame on the column base, and the engaging portion of the joining frame is attached to the engaging receiving portion of the base. The base and the joint frame are assembled by fitting, and the base and the joint frame are joined by fillet welding between the engaging portion and the engagement receiving portion.

[0008] When the column material is H-shaped steel, (1) the base is a square or circular steel pipe larger than the column material, and the joining frame is a frame comprising an annular portion surrounding the column material and an engaging portion projecting outward. The base is provided with a level adjuster at the lower edge and an engagement receiving portion at a position corresponding to the engagement portion at the upper edge, and the annular portion of the joining frame fitted to the pillar is abutted or filled. Joined to the column base by welding,
The engagement portion of the joining frame is fitted to the engagement receiving portion of the base, the base and the joining frame are assembled, and the base and the joining frame are joined by fillet welding between the engaging portion and the engagement receiving portion, or ( 2) The base is an H-shaped steel larger than the column material, and the joint frame is composed of a pair of engaging parts sandwiching the column material.
An engagement receiving portion is provided at a position corresponding to the engaging portion on the upper edge, and each of the engaging portions of the joining frame sandwiching the column base is joined to the column base by butt or fillet welding, and the base is provided with an engagement receiving portion. The base and the joining frame are assembled by fitting the engaging portion of the joining frame into the portion, and the base and the joining frame are joined by fillet welding between the engaging portion and the engaging receiving portion.

In any of the above cases, the gusset portion is protruded from the engagement receiving portion, and the base and the joining frame are assembled by fitting the engaging portion into the engagement receiving portion. Can be replaced with a column base fixing structure for joining the base and the joining frame by bolt connection with the base. When the engaging portion is an engaging plate, the gusset portion is a gusset plate. When the engaging portion is an engaging block, the thickness of the gusset plate is appropriately determined according to the strength.

The base may be a steel pipe or H-shaped steel having a size larger than the column by 10 cm or more, that is, the minimum distance between the outer surface of the column and the inner surface of the base may be at least 5 cm. For example, when both the column and the base are square steel pipes, a base having a side that is at least 10 cm larger than one side of the column is used. Also,
When the column and base are circular steel pipes, 10 cm from the diameter of the column
The base having the larger diameter is used. Furthermore, when both the column material and the base are H-section steel, 10 cm from the column material in the strong axis direction
Use a large base. The level adjuster provided on the lower edge of the base includes a long nut, and bolts of the long nut are attached to the lower edge of the base at equal intervals. For example, when the base is a square steel pipe, bolts are welded to four points at the midpoint of each side or a total of eight points at the corners and the midpoint of each side. If the base is a circular steel pipe,
Weld the bolts so that they correspond to the slits on the upper edge. When the base is an H-section steel, a bolt is welded to each flange end. The engagement receiving portion provided on the upper edge of the base has a width slightly larger than the engagement portion and a depth slightly larger than the height of the engagement portion. This base is fixed to the concrete that composes the foundation, but if necessary, stud bolts are welded to the base, or a steel material that becomes a root entanglement near the center height inside the foundation is fixed (welded) to the base by welding .

When the column material is a steel pipe material (square steel pipe or circular steel pipe), the joining frame has an annular portion having an inner peripheral surface following the outer surface of the column material, and a member projecting outward from the annular portion. It shall be a cast (cast iron or cast steel) integrally formed product consisting of the joint part. Casting makes it easy to manufacture structures with complex shapes,
A groove for the pedestal can be formed at the same time. As described above, the basic joining frame is a band member in which the annular portion is wound around the outer surface of the column member, and has a structure in which the engaging portion protrudes as a vertical surface orthogonal to the band member. (The upper and lower edges of the inner peripheral surface) have a groove shape. When the column material is a square steel pipe, the annular portion has a substantially square shape in a plan view, and the engaging portion basically has a well-girder shape in a plan view that protrudes two by two as plates extending from each side of the annular portion. If necessary, an engaging portion projecting outward from the middle of each side of the annular portion may be provided, but in this case, the inner drum plate is attached to the pillar at a height corresponding to the fixing position of the joining frame on the pillar. . When the column material is a circular steel pipe, the annular portion has a circular shape in a plan view, and the engaging plate preferably has a star-like shape in a plan view in which the engaging plates project at equal intervals and radially from the annular portion, which corresponds to a fixing position of the joint frame on the column base. Attach the inner drum plate to the pillar at height. In addition, when the column material is an H-shaped steel, the engagement frame of the frame body can be used in the same manner as described above, and only the pair of engagement portions extending in the strong axis direction with the column material interposed therebetween are used as the engagement frame. be able to. These engagement portions are several cm from the outer surface of the base when fitted in the engagement receiving portions.
Make the length protruding. The thickness and height (selection of a plate and a block) of the annular portion and the engagement portion of the engagement frame are appropriately determined based on the required structural strength.

The joint between the engagement frame fixed to the column base and the base embedded in the base is performed by fitting the engagement portion into a corresponding engagement receiving portion of the base, and filling the intersection of the engagement portion and the base surface with a fillet weld. It is realized by sticking. Instead of fillet welding, a gusset plate is protruded from the edge of the engagement receiving portion, and the engaging portion fitted into the engagement receiving portion and the gusset plate face each other. Is also good. In this case, the gusset plate can be provided on the inner surface or the outer surface of the base. Usually, the gusset plate protrudes from the outer surface of the base in the extending direction of the engagement receiving portion fitted into the engagement receiving portion, and is bolted to the outer surface of the base. In some cases, gusset plates protruding from both the inner surface and the outer surface of the base may be used for bolting the inner and outer surfaces of the base. Also, the number of gusset plates can be provided on one side or both sides with respect to the edge of each engagement receiving portion.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partial view showing a column base fixing structure using a square steel pipe as a column material 1, a square steel pipe as a base 2, and a joint frame 3 made of cast steel and having a crossbeam shape as a basic configuration of the present invention. FIG. 2 is an exploded perspective view showing a joining or assembling relationship of each member, FIG. 3 is a partially broken perspective view showing a state where the joining frame 3 and the base 2 are assembled and joined by fillet welding, 4 is a partially cutaway perspective view corresponding to FIG. 3 when the joining frame 3 having the intermediate engaging frame 21 is used, and FIG. 5 is a diagram when a combination of the wide engaging block 22 and the engaging notch 23 is used. FIG. 6 is a longitudinal sectional view of the column base fixing structure, and FIG. 7 is a plan view of the column base fixing structure (column members are cross sections). For convenience of illustration, butting or fillet welding marks are omitted in FIGS. 1 and 2.

The column base fixing structure of the present embodiment is configured as shown in FIG. 1 by joining or assembling the members in the relationship shown in FIG. FIG. 2 or FIG.
As can be seen in FIG. 2, a substantially square annular portion 5 following the outer surface of the column base 4 and two engaging plates 6 projecting in four directions as extension surfaces of each surface of the annular portion 5 have a well-shaped girder shape in plan view. is there. The joining frame 3 has an inner peripheral surface that follows the outer surface of the column base 4, and one side of the inner peripheral surface is several mm larger than one side of the column material. The engagement plate 6 has a length protruding from the outer surface of the base 2 by several cm. The joining frame 3 can be manufactured by cutting, but if it is made by casting (made of cast iron or cast steel), a product having a complicated shape can be manufactured easily at low cost. In addition, it is preferable from the viewpoint of strength that the annular portion 5 and the engagement plate 6 can be integrally manufactured. The joint frame 3 is fitted into the column base 4 in advance in a factory or the like, and is welded at the upper edge and the lower edge of the annular portion 5.
(Butting or fillet welding marks 20, see FIG. 6)).
In this example, the lower surface of the pillar 1 is closed with a base plate 8.

Similarly, a square steel pipe serving as the base 2 is provided with a slit 9 at a position corresponding to the engaging plate 6 of the joining frame 3 at an upper edge in a factory or the like, and a length serving as a level adjuster at a lower edge. The nut 10 (accurately a long nut bolt) is attached by welding. The slit 9 is about several mm larger than the thickness of the engagement plate 6 of the joining frame 3 and has a depth slightly larger than the height of the engagement plate 6. As shown in FIGS. 1 and 2, the long nut 10 is attached to four midpoints of each side of the base 2. If necessary, a long nut may be used at a total of eight places by attaching to a corner. In this example, in order to obtain a higher fixing of the column base, the root string 11 formed by combining H-shaped steels is formed. The H-shaped steel constituting the root joint 11 is previously welded to the outer surface of the base 2 at a factory or the like, or is appropriately welded to the outer surface of the base 2 on site.

The assembling of the joining frame 3 and the base in this embodiment is as shown in FIG. The joining frame 3 is composed of the pillar 1
And is fixed to the column base 4 by butt or fillet welding (butt or fillet welding mark 20). Then, an engagement plate 6 protruding from a corner of the annular portion 5 of the joining frame 3
Is fitted into the corresponding slit 9 of the base, and the engagement plate 6 and the base 2 surface are fillet welded (fillet weld marks 7). As described above, the configuration basically is as shown in FIG. In order to increase the fixing degree of the pedestal, the thickness or height of the engaging portion may be increased or the number of the engaging portions may be increased. For example,
As can be seen in FIG.
Or a joint frame 3 in which a wide engagement block 22 is fitted into a wide engagement notch 23 as shown in FIG. When the intermediate engagement plate 21 is provided, an inner drum plate 24 may be provided so that the one surface of the column material is not deformed.

In the construction of the column base fixing structure according to the present invention, the column member 1 and the base 2 whose members have been joined in advance in a factory or the like are transported to the site and started. First, the base 2 is erected on the cast concrete 12 via the long nuts 10, and the length of each long nut 10 is adjusted to adjust the level of the base 2 and align the column. After that, although not shown, a base reinforcing bar is constructed around the base 2 using a reinforcing bar penetration hole previously provided in the base by a drilling machine or the like at a factory, and after level adjustment and the like are again performed, The foundation concrete 13 is cast. When the base 2 is stably fixed by the solidification of the foundation concrete 13, the engaging plate 6 is fitted into the slit 9 on the upper edge of the base 2 to assemble the base 2 and the joint frame 3, and the base 2 and the joint frame 3 are welded by fillet welding. Join the joint frame 3
(See FIG. 7 for fillet weld 7). Then, the base mortar 14 is poured into each gap between the column 1, the joint frame 3, and the foundation concrete 13 so that the axial force of the column 1 is transmitted to the foundation concrete 13, and finally, the soil concrete is moved outward from the joint frame 3. Placing 15 completes the construction of the column base fixing structure. Although the description is omitted, the same processing and procedure can be applied when the base is a circular steel pipe while the column material is a square steel pipe.

A conventional column base fixing structure using a base plate is a joint at a point between an anchor bolt and a base plate, and the fixing of a column material can only depend on the rigidity of the base plate and the tensile strength of the anchor bolt.
On the other hand, in the column base fixing structure of the present invention, the joining at the intersection of the engaging plate 6 and the surface of the base 2 in the slit 9 at the upper edge of the base 2, that is, the joining by lines. In addition, since the joining is fillet welding, it is simple but exhibits strong joining strength. In this manner, each of the plurality of engagement plates 6 is pulled or compressed to exert strength against each of them, and as a result, a large rotation spring constant is obtained and a high column base fixing degree is obtained.

FIGS. 8 and 9 show the base 2 and the joint frame 3 in the column base fixing structure shown in FIGS. 1 and 2 by bolting the engaging plate 6 and the gusset plate 16 fixed to the base 2. 8 is a longitudinal sectional view corresponding to FIG. 1, and FIG. 9 is a plan view (column material is a cross section) of the column base fixing structure equivalent to FIG. 7. In the column base fixing structure of this example, a gusset plate 16 protruding from the side of the slit 9 in the orthogonal direction and the engaging plate 6 are connected by bolts 17. Compared to fillet welding, bolt connection further reduces the labor of construction. The engaging plate 6 of the joining frame 3 in this example is longer than the engaging plate of the above-described joining frame for bolt connection.

FIG. 10 is a longitudinal sectional view of a column base fixing structure using a circular steel pipe as the column member 1, a circular steel pipe as the base 2, and a joint frame 3 made of cast steel having a star shape in plan view. FIG. It is a top view (column material is a cross section) of a column base fixing structure. In the column base fixing structure of the present example, the joining frame 3 has a circular annular portion 5 following the column base 4 outer surface,
The annular portion 5 has a star shape in a plan view, which includes an engaging plate 6 protruding in the radial direction. It is preferable that the engagement plates 6 protrude at equal intervals in the circumferential direction, and a total of four engagement plates are provided every 90 degrees or a total of eight engagement plates are provided every 45 degrees as in this example. The inner diameter of the annular portion 5 is about several mm larger than the outer diameter of the column 1. The point that the engagement plate 6 protrudes from the outer surface of the base 2 by several cm and that it is made of casting is the same as the example shown in FIG. The joint frame 3 is fitted in the column base 4 in advance in a factory or the like,
The upper and lower edges of the annular portion 5 are joined by welding (butting or fillet welding marks 20 are shown in FIG. 10). The pillar 1 has a pillar 4
The inner drum plate 24 is attached at a height corresponding to the position where the joining frame 3 is fixed at the position shown in FIG. Root connection to base 2
11 is configured by winding an L-shaped steel around the base 2. Although a description is omitted, a similar column base fixing structure can be constructed even when the base is a square steel pipe while the column material is a circular steel pipe. Further, a structure by bolt connection with an additional gusset plate can also be used.

FIG. 12 is a longitudinal sectional view of a column base fixing structure using an H-shaped steel as the column material 1, a square steel pipe as the base 2, and a joint frame 3 made of cast steel and having a cross-shaped girder shape in plan view. FIG. FIG. 2 is a plan view of a leg fixing structure (a column member is a cross section). In the column base fixing structure of the present invention, the engaging plate 6 of the joining frame 3 which is butted or fillet welded to the column base 4 of the column member 1 is assembled to the slit 9 of the base 2 and is fillet welded or bolted. . 12 and 13, there is no difference except that the column 1 is changed from a square steel pipe to an H-shaped steel, as can be seen in comparison with the examples shown in FIG. For this reason, the improvement in the fixing degree of the column pedestal according to the present invention also appears remarkably when the column material 1 is an H-beam.

When the column 1 is an H-shaped steel, an H-shaped steel is also used for the base 2 in order to more simply realize a column base fixing structure. FIG. 14 is a longitudinal sectional view of a column base fixing structure using an H-shaped steel for the column member 1, an H-shaped steel for the base 2, and a joint frame 3 having a pair of parallel steel plates as the engagement plates 6, and FIG. It is a top view (column material is a cross section) of a column base fixing structure. In the column base fixing structure of the present example, the joint frame 3 is formed by sandwiching the column members 1 with an engagement plate 6 made of a pair of parallel steel plates extending in the strong axis direction of the H-shaped steel and welding the column members. The base 2 uses an H-shaped steel having a larger standard than the column 1 in the same direction. H to be base 2
The shape steel is a web 18 that is an obstacle when the joint frame 3 is assembled.
, And a slit 9 corresponding to the engagement plate 6 is provided in the flange 19. In addition, although the description is omitted, when the column material is H-shaped steel and the base is a circular steel pipe,
A structure with bolt connection by adding a gusset plate can also be used.

[0023]

Next, in order to confirm the improvement of the fixing degree of the column pedestal according to the present invention, a comparison was made with a conventional column pedestal fixing structure using a base plate. Assuming the case of a square steel pipe, a circular steel pipe, and an H-shaped steel as the column material, numerical analysis was performed on a base plate type conventional example and an equivalent product of the present invention, respectively. Table 1 shows the analysis results. As can be seen from the results, in the present invention, each of the rotation spring constants indicating the magnitude of the degree of fixing of the column pedestal is approximately doubled. This means that a large pedestal fixing degree can be obtained with a member having a size similar to that of the related art.

[0024]

[Table 1]

[0025]

According to the column base fixing structure of the present invention, a necessary and sufficient column base fixing degree can be realized at a lower cost than in the past by using an off-the-shelf product which can be usually purchased. In the case of the conventional column base fixing structure using the base plate, a great deal of labor and labor were required to absorb the displacement of the anchor bolts during construction. However, according to the present invention, even if such a position shift problem occurs, the above problem can be easily solved only by a simple correction in fillet welding. In addition, the joining frame can be made of cast material to exhibit sufficient strength, and by making it made of cast material, it is possible to easily and inexpensively produce a structure in which a large number of engagement plates protrude or a structure in which a groove is provided in advance. This also leads to a reduction in the overall construction cost. Thus, the present invention provides a new column base fixing structure that achieves both improved performance and reduced cost.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing a column base fixing structure using a square steel pipe as a column material, a square steel pipe as a base, and a joint frame made of cast steel and having a cross-shaped cross-girder shape.

FIG. 2 is an exploded perspective view showing a joining or assembling relationship of each member.

FIG. 3 is a partially broken perspective view showing a state in which a joining frame and a base are assembled and joined by fillet welding;

FIG. 4 shows a case where a joining frame having an intermediate engagement frame is used.
FIG. 5 is a perspective view of a partly broken section.

5 is a partially cutaway perspective view corresponding to FIG. 3 when a combination of a wide engagement block and an engagement notch is used.

FIG. 6 is a longitudinal sectional view of the column base fixing structure.

FIG. 7 is a plan view of the column base fixing structure (column members are cross sections).

8 is a longitudinal sectional view corresponding to FIG. 1 of the column base fixing structure in which the base and the joining frame are joined by bolting the engaging plate and the gusset plate fixed to the base.

FIG. 9 is a plan view of the column base fixing structure corresponding to FIG.

FIG. 10 is a longitudinal sectional view of a column base fixing structure using a circular steel pipe as a column material, a circular steel pipe as a base, and a joint frame made of cast steel having a star shape in plan view.

FIG. 11 is a plan view of the column base fixing structure (column members are cross sections).

FIG. 12 is a vertical cross-sectional view of a column base fixing structure using an H-shaped steel as a column material, a square steel pipe as a base, and a joint frame made of cast steel and having a crossbeam shape in plan view.

FIG. 13 is a plan view of the column base fixing structure (the column material is a cross section).

FIG. 14 is a longitudinal sectional view of a column base fixing structure using an H-shaped steel as a column material, an H-shaped steel as a base, and a joining frame formed of a pair of parallel steel plates as engagement plates.

FIG. 15 is a plan view of the column base fixing structure (the column material is a cross section).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Column material 2 Base 3 Joint frame 4 Column base 5 Annular part 6 Engagement plate 7 Fillet weld mark 9 Slit 10 Long nut 20 Butt or fillet weld mark 21 Intermediate engagement plate 22 Engagement block 23 Engagement notch 24 Inner drum plate

Claims (7)

(57) [Claims] 1. Structure for rigidly fixing a column material to a foundationSo
Embedded in the foundationRubeTo the column base
And the joint frameColumn base fixed structure,Protruding outward
DoEngagement partThe joint frame is fixed to the column base by welding and
In the position corresponding to the engagement partbaseSlip to upper edge
Or notchEngagement receiving partAnd the engagement part is
Corresponding engagement receiverBase and joint frame
Assemble and joinCharacterized byColumn base fixed structure. 2. The column material is a square steel tube, the base is a steel tube material larger than the column material, and the joining frame is a frame body comprising an annular portion surrounding the column material and an engaging portion projecting outward from the annular portion. Yes,
The base has a level adjuster at the lower edge, an engagement receiving portion provided at a position corresponding to the engaging portion at the upper edge, and an annular portion of the joining frame fitted to the column material is fixed to the column base by welding, The base and the joining frame are assembled by fitting the engaging portion of the joining frame into the engaging receiving portion of the base, and the base and the joining frame are joined by fillet welding between the engaging portion and the engaging receiving portion. Item 2. The column base fixing structure according to Item 1. 3. The pillar according to claim 2, wherein the inner drum plate is attached to the pillar at a height corresponding to the fixing position of the joining frame on the pillar, and the engaging portion projects from a position corresponding to the surface of the pillar. Column base fixed structure. 4. The column material is a circular steel tube, the base is a steel tube material larger than the column material, and the joining frame is a frame body comprising an annular portion surrounding the column material and an engaging portion projecting radially from the annular portion. The base is provided with a level adjuster at the lower edge and an engagement receiving portion at a position corresponding to the engaging portion at the upper edge, and the annular portion of the joint frame fitted to the column material is fixed to the column base by welding. Attach the inner drum plate to the pillar at a height corresponding to the position where the joining frame is fixed to the pillar base, and fit the engaging portion of the joining frame into the engaging receiving portion of the base to assemble the base and the joining frame. The column base fixing structure according to claim 1, wherein the base and the joining frame are joined by fillet welding between the engaging portion and the engaging receiving portion. 5. The column material is an H-shaped steel, the base is a steel pipe material larger than the column material, and the joining frame is a frame body including an annular portion surrounding the column material and an engaging portion projecting outward. A level adjuster is provided on the lower edge, and an engagement receiving portion is provided on the upper edge at a position corresponding to the engaging portion. The annular portion of the joining frame fitted to the column material is fixed to the column base by welding, and 2. The base and the joining frame are assembled by fitting the engaging portion of the joining frame into the joint receiving portion, and the base and the joining frame are joined by fillet welding between the engaging portion and the engaging receiving portion. Column base fixed structure. 6. The column material is an H-shaped steel, the base is an H-shaped steel larger than the column material, and the joint frame is composed of a pair of engaging portions sandwiching the column material. The base has a level adjuster at a lower edge and the upper edge has a level adjuster. An engaging receiving portion is provided at a position corresponding to the engaging portion, and each engaging portion of the joining frame sandwiching the column is fixed to the column by welding, and the engaging frame is engaged with the engaging receiving portion of the base. The column base fixing structure according to claim 1, wherein the base and the joining frame are assembled by fitting the portion, and the base and the joining frame are joined by fillet welding between the engaging portion and the engaging receiving portion. 7. A gusset portion is protruded from the engagement receiving portion, and the base and the joining frame are assembled by fitting the engaging portion into the engagement receiving portion, and the engagement portion and the gusset portion are bolted together. The column base fixing structure according to claim 1, wherein the base and the joint frame are joined.