JPH08277575A - Stud-section non-welding connecting structure of thickened column - Google Patents

Abstract

PURPOSE: To augment the strength of connection, and to facilitate the execution of works by increasing the thickness of the upstanding section of a baseplate, machining the end section of a steel-pipe column in a thickness increasing manner and connecting both upstanding section and end section by a bolt through a splice plate. CONSTITUTION: Thick upstanding sections 2b are disposed integrally in upright to baseplates 2a by welding, etc., and a plurality of boltholes are formed, thus forming a stud member 2. On the other hand, the thickness of the end section of a steel-pipe column 1 is increased, and the wall thickness of a thickened section 1a is made the same as that of the upstanding section 2a. The steel-pipe column 1 and the stud member 2 are abutted, splice plates 3 and 4 are applied from the inside and the outside, and the steel-pipe column 1 and the stud member 2 are coupled by high-tensile bolts 5. The upstanding sections 2b are removed, the splice plates 3, 4 are used as angle materials, and the steel-pipe column 1 and the stud member 2 can also be joined by the bolts through the angle materials. One-side bolt is employed as a connecting bolt, and clamping work is conducted from the outside. Accordingly, the strength of connecting sections is increased while the efficiency of the execution of works can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welded joint structure for a column base of a thickened column applied to a steel frame building or the like using a steel tube column.

[0002]

2. Description of the Related Art Conventionally, a structure shown in FIG. 9 has been proposed as a structure for joining a lower end of a steel pipe column to a base plate without welding (Japanese Utility Model Publication No. 3-48001). This is because the thick rising portion 51b provided on the base plate 51a of the column base member 51 is abutted against the lower end of the steel pipe column 50, and the liner plate 52 corresponding to the difference in wall thickness between the steel pipe column 50 and the rising portion 51b. Is overlaid on the back surface of the steel pipe column 50 and is joined with the inner and outer attachment plates 53, 54 with bolts 60, 61. An opening 51c is formed in the center of the base plate 51a.
Is provided so that the hands and tools of workers can be inserted when tightening bolts.

[0003]

According to this structure, the column base member 51 side has a strong strength because the rising portion 51b is thick. However, the lower end of the steel pipe column 50 has a small wall thickness, and there is a problem in that it is difficult to achieve a satisfactory firm joint due to a cross-section loss due to the formation of the through hole of the bolt 60. Even if the liner plates 52 are overlapped with each other, only the effect of eliminating the difference in wall thickness and facilitating bolt joining is obtained, and it does not contribute much to the improvement of the strength of the lower end of the steel pipe column 50. Also, since the liner plate 52 is required,
There are problems that the number of members increases and the structure becomes complicated, and joining takes time.

An object of the present invention is to provide a column-base weldless joint structure for a thickened column, which enables firm joining. Another object of the present invention is to provide a column base weldless joint structure of a thickened column which has a small number of constituent members and can be easily constructed.

[0005]

According to another aspect of the present invention, there is provided a welded joint structure for a column base portion of a thickened column, wherein a rising portion provided on a base plate of a column base member and a lower end of a steel pipe column are attached plates. In a joint structure in which the steel pipe columns are overlapped and bolted to each other, the lower end of the steel pipe column is a thickened portion by heat treatment, and the rising portion of the column base member has the same diameter and the same thickness as the thickened portion. . The bolt that joins the attachment plate and the rising portion of the column base member may be a one-side bolt. The "one-side bolt" referred to in this specification is a general term for a shaft-shaped tightening metal fitting that can be tightened by an operation from one end side so that the other end is plastically deformed in a diameter-expanded state and tightened. being called. In the welded joint structure of the column base portion of the thickened column of the invention of claim 3, a steel pipe column is erected on the base plate, and the lower end of the steel pipe column is used as the thickened portion by heat treatment, and the thickened process of the steel pipe column is performed. An angle member is provided along the flange and the upper surface of the base plate, and both flanges of the angle member are bolted to the thickened portion and the base plate, respectively. The angle member is not limited to the L-shaped steel, but may be a flat plate such as an iron plate bent into an L-shape. The bolt that joins the base plate and the angle member may be a one-side bolt.
The column base non-welded joint structure of the thickened column of the invention of claim 5 is the column base non-welded joint structure of the invention of claim 1, wherein
Instead of making the thickened portion have the same diameter and the same thickness as the rising portion of the column base member, it is thinner than the rising portion, and the thickened portion is provided between the thickened portion and the attachment plate. And a liner plate for filling the thickness difference between the rising portion and the rising portion is interposed. Also in this case, the bolt that joins the attachment plate and the rising portion of the column base member may be a one-side bolt.

[0006]

According to the joint structure of this structure, since the lower end of the steel pipe column is used as the thickened portion, the cross-section loss due to the formation of the bolt hole can be compensated, and a structurally satisfactory and firm joint can be achieved. In the case of the structure of the invention of claim 1, since the rising portion on the base plate of the column base member is also thick like the thickened portion of the steel pipe column, more firm joining can be performed. Further, since the rising portion and the thickened portion have the same thickness, it is not necessary to interpose a member for compensating for the difference in thickness, the number of members is reduced, and a simple joining structure is obtained. In the case of the structure of the third aspect of the invention, since the thickened portion of the steel pipe column is bolted to the base plate with the angle member, it is not necessary to provide the rising portion on the base plate, and the structure is simple. In the case of the structure of claim 5, since the liner plate is interposed in the thickened portion, the thickened portion cannot be thickened to the same thickness as the rising portion of the column base member due to manufacturing reasons, or Even if it is uneconomical to increase the thickness to the same thickness, a firm joint can be obtained. When one-sided bolts are used in these joining structures, joining work can be performed even if there is no opening in the base plate or the steel pipe column. As one-side bolts, ones that can obtain a strong tightening force have been developed in recent years, and by selecting such one-side bolts, it is possible to combine a thickened part with a very simple and firm joint structure. Can be

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIG. This embodiment is mainly applied to the case where the column base is rigidly joined. In the welded joint structure of the column base portion of the thickened column according to this embodiment, the lower end of the rectangular steel pipe column 1 is made into the thickened portion 1a by heat treatment, and the thickened portion 1a and the column base member 2 are joined together. The rising portions 2b provided on the base plate 2a are joined with the bolts 5 by stacking the inner and outer attachment plates 3 and 4. In the illustrated example, the thickness-increased portion 1a has a thickness that swells inward and outward, but it may also swell only inward or outward. A high-strength bolt or the like is used as the bolt 5.

A plurality of bolt insertion holes 7 are formed in the thickened portion 1a of the steel pipe column 1. The rising portion 2b of the column base member 2 is
A tubular portion having the same diameter and thickness as the thickened portion 1a of the steel pipe column 1 is formed, and a plurality of bolt insertion holes 8 are also formed in the rising portion 2b. The column base member 2 is integrally formed of cast iron or cast steel, but may be formed by welding a rising portion 2b made of a thick-walled rectangular steel pipe to a base plate 2a made of a steel plate. Further, the rising portion 2b does not necessarily have to be a continuous tubular shape, and for example, the four side walls may be formed by individual rising plates. The inner support plate 3 has a plurality of bolt insertion holes 9a aligned with the bolt insertion holes 7 of the steel pipe column 1, and a rising portion 2b.
And a plurality of bolt insertion holes 9b aligned with the bolt insertion holes 8 of FIG. The outer supporting plate 4 also has a plurality of bolt insertion holes 10a aligned with the bolt insertion holes 7 of the steel pipe column 1, and the rising portion 2
a plurality of bolt insertion holes 10 aligned with the bolt insertion holes 8 of FIG.
b and are provided.

At the time of joining work, the bolt 5 is inserted from some of the uppermost row bolt insertion holes 10a of the outer attachment plate 4 to the corresponding bolt insertion holes 7 of the steel pipe column 1 and the corresponding bolt insertion holes 9a of the inner attachment plate 3. Then, the nuts 6 are screwed onto the bolts 5 to temporarily fix the inner and outer attachment plates 3 and 4 to the thickened portion 1a at the lower end of the steel pipe column 1. As shown in FIG. 1 (B), the lower end of the steel pipe column 1 to which the inner and outer attachment plates 3 and 4 are temporarily fixed and the upper end of the rising portion 2b of the column base member 2 are shown in FIG.
Butt like (C). 11 in FIG. 1 (C)
Is a stay, and by suspending the stay between the bolt insertion holes 9b and 10b of the both attachment plates 3 and 4, for example, in the third row, the lower side of the attachment plates 3 and 4 is opened and the steel pipe The work of joining the lower end of the column 1 and the rising portion 2b of the column base member 2 can be easily performed. Next, the bolts 5 are inserted from the remaining bolt insertion holes 10a, 10b of the outer supporting plate 4 to the corresponding bolt insertion holes 7 of the steel pipe column 1 and the bolt insertion holes 9a, 9b of the inner supporting plate 3, and the nuts are attached to the bolts 5. The lower end of the steel pipe column 1 and the rising portion 2b of the column base member 2 are bolted to each other by screwing 6 together. The bolt 5 and the nut 6 in the temporarily fixed state are finally tightened.

In the above-mentioned bolt joining work, in order to screw the nut 6 to the bolt 5 inside the steel pipe column 1 and the rising portion 2b, the hand is inserted through the opening 2c formed in the center of the base plate 2a of the column base member 2. By. In addition, in the said Example, although the bolt 5 was inserted from the front side of the outer side attachment plate 4 and the nut 6 was screwed to the bolt 5 on the back side, the bolt 5 was inserted toward the outer side from the back side and the outer side attachment plate 4 was inserted. The nut 6 may be screwed onto the bolt 5 on the front side of the bolt 4.

FIG. 2A shows a second embodiment of the present invention. The column base non-welded joint structure of the thickened column according to this embodiment is obtained by replacing the high-strength bolt 5 in the first embodiment with a one-side bolt 12. The one-sided bolt 12 is inserted from the bolt insertion holes 10a, 10b of the outer support plate 4 to the bolt insertion hole 7 of the steel pipe column 1 or the bolt insertion hole 8 of the rising portion 2b and the bolt insertion holes 9a, 9b of the inner support plate 4. Let In this case, since it is not necessary to insert a hand into the rising portion 2b of the column base member 2 or the inside of the steel pipe column 1, the opening 2c of the base plate 2a of the column base member 2 is omitted. Other configurations are the same as those in the first embodiment. In this embodiment, all the bolts used are the one-side bolts 12. However, only one of the steel pipe column 1 side and the rising portion 2b side is the one-side bolt 12, and the other bolt is the normal high bolt. Power bolt 5
(FIG. 1). For example, when temporarily attaching the support plates 3 and 4 to the steel pipe column 1 side by the joining method as shown in FIG.
A high-strength bolt 5 is used as a bolt for joining the attachment plates 3 and 4 and the steel pipe column 1, and the bolt on the rising portion 2b side is a one-side bolt 12. When joining the support plates 3 and 4 to the steel pipe pillar 1, the bolting work can be performed with the lower part of the steel pipe pillar 1 open, so that there is no problem even with the high-strength bolt 5. On the contrary to the above, when temporarily attaching the attachment plates 3 and 4 to the rising portion 2b side and joining them to the steel pipe column 1 later, the bolt on the rising portion 2b side is set as the high-strength bolt 5, and the steel pipe column 1 side The one side bolt 12 of. FIG. 2B shows the third embodiment of the present invention. In this example, in the example of FIG. 1, the thickened portion 1a of the steel pipe column 1 is made thinner than the rising portion 2b of the column base member 2, and the liner plates 45 and 46 for filling the thickness difference are made thicker in the thickened portion 1a. It is interposed between the inner and outer attachment plates 3 and 4 on both sides. FIG. 2C shows a fourth embodiment of the present invention. In this example, in the example of FIG. 1, the thickened portion 1a of the steel pipe column 1 is made thinner than the rising portion 2b of the column base member 2,
A liner plate 45 for filling the difference in wall thickness is interposed between the liner plate 45 and the attachment plate 4 on the outer surface side of the thickened portion 1a. The thickened portion 1a is designed to bulge only on the inner diameter side. In the case of these examples of FIGS. 2B and 2C, the rising portion 2b of the column base member 2 is formed to be thicker than the wall thickness of the thickness-increased portion 1a, so that more firm fixing can be performed. Alternatively, firm joining can be performed even when the thickened portion 1a cannot be made too thick due to manufacturing reasons or when it is uneconomical to make it thick.

FIG. 3 shows an example of the one-side bolt 12 used in the above-mentioned joining structure. This one side bolt 12
Is a pin 37 and a pin head 37a on the outer periphery of the pin 37.
It is assumed to have a valve sleeve 38, a grip sleeve 39, a shear washer 40, a receiving washer 41, and a nut 42 which are arranged side by side from the side. The pin 37 has a fracture groove 37d in the middle of the threaded portion 37b following the round shaft portion 37e, and has a pin head portion 37a having a diameter slightly larger than the pin diameter at its tip.
Have. Further, a short pin tail 37c is provided following the screw portion 37b. The pin tail 37c has an outer diameter surface formed as an uneven surface for preventing slippage, and is, for example, an uneven surface formed by forming a large number of rows of teeth arranged in the axial direction in the circumferential direction. The bubble sleeve 38 is made of a material softer than that of the grip sleeve 39 and is plastically deformable outward in the form of a brim by the load of the axial force. For example, the grip sleeve 39
Is a hard steel alloy, and the bubble sleeve 38 is a soft steel alloy. The receiving washer 41 is formed to have an inner diameter that allows the grip sleeve 39 to enter, and an annular groove 41a into which the outer peripheral portion of the shear washer 40 is fitted is provided on the side surface on the pin head side. The share washer 40 has an inner peripheral portion that engages with the end surface of the grip sleeve 39 and shears with a predetermined axial force. Further, in this example, the tip end side portion 37e ₁ of the round shaft portion 37e of the pin 37 is made slightly larger than the base end side portion 37e ₂ through the step portion 37f, and the inner diameter of the grip sleeve 39 is set to the tip end side portion 37e. _The diameter is smaller than ₁ . The round shaft portion 37e may have the same diameter over the entire length.

The operation of fastening the one side bolt 12 is as follows.
It can be performed using a rotary electric tightening tool (not shown). That is, while the pin tail 37c is gripped by the tightening tool, the nut 42 is tightened by the box-shaped nut engaging portion of the tool. As a result, a compressive force is applied between the pin head portion 37a and the shear washer 40 to sandwich the grip sleeve 39 and the valve sleeve 38, and the valve sleeve 38 at the tip starts plastically deforming outward in a brim shape. That is, barbing occurs. Round shaft part 3 of pin 37
When 7e is stepped, the above-mentioned barbing occurs until the grip sleeve 39 engages with the step portion 37f. When the nut 42 is further tightened, the shear washer 40 is sheared and the grip sleeve 39 is moved to the shear washer 40.
Enter inside. As a result, when the collar-shaped deformed portion 38a of the valve sleeve 38 engages with the inner surface of the inner side supporting plate 3, the outer side supporting plate 4, between the nut 42 and the collar-shaped deforming portion 38a.
A tightening axial force is introduced into the steel pipe column 1 (or the rising portion 2b) and the inner support plate 3. When the nut 42 is further tightened and rotated, the pin tail 37c breaks in the break groove 37d with a predetermined axial force introduced (FIG. 3).
(B)).

When this one side bolt 12 is used, strong joining can be performed as follows. That is, due to the shearing of the shear washer 40, the nut 42 and the valve sleeve 3
The tightening force with the brim-shaped deformed portion 38a of 8 serves as a tightening force for directly sandwiching the outer supporting plate 4, the steel pipe column 1 (or the rising portion 2b), and the inner supporting plate 3 to obtain a strong tightening force. . Further, in the case of the one side bolt 12, the following respective advantages can be obtained. First, since the flange-shaped deformed portion 38a of the valve sleeve 38, which serves as the head of the bolt, spreads widely, the contact pressure with the inner attachment plate 3 becomes small, and the bolt hole diameter has a relatively allowable width. For example, the problem that the edges of the bolt insertion holes 9a and 9b are deformed by the contact pressure and the bolt head is fitted is unlikely to occur. Along with that, the load bearing capacity of the bolt head including the collar-shaped deformed portion 38a is improved, the tightening force of the one-side bolt 12 is improved, and the efficiency is improved. Moreover, since the nut 42 is rotated and tightened, it can be tightened twice or retightened.

FIG. 4 shows a fifth embodiment of the present invention,
It is mainly applied when using a column base with pin joints. In the welded joint structure of the column base portion of the thickened column according to this embodiment, the lower end of the steel pipe column 1 is made into the thickened portion 1a by heat treatment, and the steel pipe column 1 is erected on the base plate 23 to perform the thickening process. Both the flanges 13a, 13b, 14a, 14 of the inner and outer angle members 13, 14 are provided on the portion 1a and the upper surface of the base plate 23.
Follow each b. The steel pipe pillar 1 and the base plate 23 are connected to the bolts 24, 26 via the angle members 13, 14.
And nuts 25 and 27 for joining. Bolts 24, 26
Use high-strength bolts, etc. Angle material 13, 14
May be a section of L-shaped steel or a member obtained by bending a flat iron plate into an L-shape. In addition, as shown in FIG. 4C, the angle member 13 on the inner side has 45 ° at both ends.
The tape is cut into a taper shape so as to avoid interference with the adjacent angle member 13 and to obtain a sufficient length.

A plurality of bolt insertion holes 15 are formed in the thickened portion 1a of the steel pipe column 1. The base plate 23 has a plurality of bolt insertion holes 16a and 16b and a plurality of anchor holes 1
7 and a central opening 23a are formed. The inner angle member 13 has a plurality of bolt insertion holes 19 aligned with the vertical flange 13a in the bolt insertion holes 15 of the steel pipe column 1, and a plurality of bolt insertion holes 20 aligned in the horizontal flange 13b with the bolt insertion holes 16a of the base plate 23. Respectively. The outer angle member 14 has a vertical flange 14a.
A plurality of bolt insertion holes 21 aligned with the bolt insertion holes 15 of the steel pipe column 1 and a base plate 23 on the lateral flange 14b.
Bolt insertion holes 2 aligned with the bolt insertion holes 16b of
2 respectively.

The base plate 23 is fixed on the column base by anchor bolts (not shown) inserted in the anchor holes 17. At the time of joining work, each angle member 13, 1
4 may be first attached to the steel pipe column 1 and subsequently bolted to the base plate 23 on the foundation, or may be attached to the base plate 23 first and then joined to the steel pipe column 1 later. The opening 23a of the base plate 23 is used when a worker's hand or a tool is inserted when bolting inside the steel pipe column 1. Inner angle member 13 bolt 24
Is inserted from the lower side, thereby preventing the bolt 24 from interfering with the mortar stand (so-called mortar bun) arranged at the center on the column base during construction.
The bolt 24 may be upside down from the above depending on the support structure at the time of constructing the base plate 23.

In this embodiment, unlike the embodiment shown in FIG. 1, it is not necessary to integrally form the rising portion 2b on the base plate 2a, and the column base member is constructed only by bolting the angle members 13 and 14. it can. Also, the inner angle material 1
The head of the bolt 24 of No. 3 hits the mortar base of the column base during construction, so that the steel pipe column 1 can be prevented from slipping and positioned when the steel pipe column 1 is built.

In the embodiment of FIG. 4, the inner and outer angle members 1
Both flanges 13a, 13b, 14a, 14b of 3, 14
Have the same length, but the vertical flange 14a of the outer angle member 14 may be longer than the horizontal flange 14b as shown in FIG. In this case, the upper end of the vertical flange 14a is independently joined to the thickened portion 1a at the lower end of the steel pipe column 1 with the bolt 26A. Also in this example, both ends of the inner angle member 13 are cut in a taper shape as in the example of FIG.

In the embodiment of FIGS. 4 and 5, the inner and outer angle members 13 and 14 are bolted to the lower end of the steel pipe column 1 by inserting the hand through the opening 23a formed in the base plate 23. However, as shown in FIG. 6, the inner and outer angle members 13 and 14 are attached to the steel pipe column 1 with the one side bolt 12.
The opening 23a of the base plate 23 may be omitted by bolting to the lower end of the base plate 23. That is, the configuration of FIG. 6 (A) is obtained by replacing the high-strength bolt 26 for bolting the inner and outer angle members 13, 14 to the lower end of the steel pipe column 1 in the embodiment of FIG. 4 with the one-side bolt 12. The opening 23a is not formed in the base plate 23. In the configuration of FIG. 6 (B), the high-strength bolts 26, 26A for bolting the inner and outer angle members 13, 14 to the lower end of the steel pipe column 1 in the configuration of FIG. 5 are replaced by the one-side bolts 12, and the opening 23a of the base plate 23 is replaced. Is omitted. When the one-side bolt 12 is used as in the example of FIG. 6, the steel pipe column 1 has a thickened portion 1a at the lower end.
May not be included.

FIG. 7 shows a proposal example of a welded joint structure without a column base. In this joint structure, an ordinary rectangular steel pipe column 1A whose lower end is not thickened is erected on the base plate 23, and both flanges 13a, 13b and 14a, 14b are provided along the lower end of the steel pipe column 1A and the upper surface of the base plate 23, respectively. The inner and outer angle members 13 and 14 are provided, and these angle members 1
The steel pipe column 1A and the base plate 23 are joined by high-strength bolts 24, 26, and 26A via the screws 3 and 14. The other structure is similar to that of the embodiment shown in FIGS.
That is, in the example of FIG. 7A, the steel pipe column 1 in the configuration of FIG. 4 is replaced with a normal steel pipe column 1A that is not thickened. In the example of FIG. 7B, the steel pipe column 1 in the configuration of FIG. 5 is replaced with a normal steel pipe column 1A.
In the case of these proposed examples as well, similarly to the examples of FIGS. 4 and 5, the column base member can be easily configured without integrally forming the rising portion on the base plate 23.

FIG. 8 shows another proposal example of the welded joint structure without the column base. In this joint structure, the high-strength bolts 23, 23A for joining the rectangular steel pipe column 1A and the inner and outer angle members 13, 14 in the configuration of FIG. 7 are replaced with one-side bolts 12. Also in this case, the rising portion 2b of the column base member 2
Since it is not necessary to insert a hand inside the base, the opening 2c of the base plate 2a of the column base member 2 is omitted. Other configurations are the same as those in the example of FIG. 7. That is, in the example of FIG. 8A, in the configuration of FIG.
The high-strength bolt 23 for joining 4 to the lower end of the steel pipe column 1 is replaced with the one-side bolt 12, and the opening 23a is not formed in the base plate 23. In the example of FIG. 8B, in the structure of FIG.
High-strength bolts 23, 2 for joining 14 to the lower end of the steel pipe column 1A
3A is replaced with the one side bolt 12, and the opening 23a of the base plate 23 is omitted.

Although each of the above embodiments has been described with respect to the case where the steel pipe column 1 is a square steel pipe column, the present invention can be applied to the case of a round steel pipe column.

[0024]

According to the first aspect of the present invention, in the welded joint structure of the column base portion of the thickened column, the rising portion provided on the base plate of the column base member and the lower end of the steel pipe column are overlapped with the attachment plate. In the joint structure for bolting, the lower end of the steel pipe column is the thickened portion by heat treatment, and the rising portion of the column base member has the same diameter and the same thickness as the thickened portion, so the bolt insertion of the steel pipe column The cross-section loss due to the formation of holes can be compensated for by the thickened portion, and firm joining can be performed, and the thickened portion can match the thickness of the rising part of the column base member to assist the thickness adjustment. No material is required, the structure is simplified and the construction is easy. In the welded joint structure of the column base portion according to the invention of claim 3, a steel pipe column is erected on the base plate, and the lower end of the steel pipe column is a thickening portion by heat treatment, and the thickening portion of the steel pipe column and the upper surface of the base plate. Angle flanges are provided along with both flanges, and both flanges of this angle member are bolted to the thickened portion and the base plate, respectively. It can be carried out. In the welded joint structure of the column base portion according to the invention of claim 5, since the liner plate is interposed in the wall thickness increasing portion, the wall thickness increasing portion is increased in thickness to the same thickness as the rising portion of the column base member for manufacturing reasons. If it is not possible or if it is uneconomical to increase the thickness to the same thickness, a strong joint can be obtained. In the joint structure according to claim 1, claim 3, and claim 5, when one-side bolts are used as the joint bolts, the bolts can be joined only by the work from the outside, so that the construction becomes easier.

[Brief description of drawings]

1A is a vertical cross-sectional view of a welded joint structure of a column base portion of a thickened column according to a first embodiment of the present invention, FIG. 1B is an exploded perspective view of the same, and FIG. FIG.

2A to 2C are vertical cross-sectional views of a welded joint structure of a column base portion of a thickened column according to second to fourth examples of the present invention.

FIG. 3 is a cross-sectional view showing a usage example of the one-side bolt used in the embodiment.

FIG. 4A is a vertical cross-sectional view of a welded joint structure of a column base portion of a thickened column according to a fifth embodiment of the present invention, FIG. 4B is a perspective view thereof, and FIG. It is a top view.

FIG. 5 is a vertical cross-sectional view showing a modified example of the same embodiment.

FIG. 6 is a vertical sectional view showing another modification of the same embodiment.

FIG. 7 is a vertical cross-sectional view of each proposed example of a column base weldless joint structure.

FIG. 8 is a vertical cross-sectional view of each of the other proposal examples of the column base non-welded joint structure.

9A is a vertical sectional view of a conventional example, and FIG. 9B is a perspective view of the same.

[Explanation of symbols]

1, 1A ... Steel pipe column, 1a ... Thickened part, 2 ... Column base member,
2a ... Base plate, 2b ... Rise part, 3 ... Inner support plate, 4 ... Outer support plate, 5, 24, 26, 26A ... High-strength bolt, 12 ... One side bolt, 13, 14 ... Angle member, 13a-14b ... Flange, 23 ... Base plate, 45, 46 ... Liner plate

Claims (6)

[Claims] 1. In a joining structure in which a rising portion provided on a base plate of a column base member and a lower end of a steel pipe column are joined together by bolts with an attachment plate, the lower end of the steel pipe column serves as a thickening portion by heat treatment. A column base portion weldless joint structure of a thickened column in which a rising portion of the column base member has the same diameter and the same thickness as the thickened portion. 2. The column-base weld-less joint structure for a wall-thickened column according to claim 1, wherein the bolt joining the attachment plate and the rising portion of the column base member is a one-side bolt. 3. A steel pipe column is erected on a base plate, the lower end of the steel pipe column is used as a thickening portion by heat treatment, and both flanges are provided along the thickening portion of the steel pipe column and the upper surface of the base plate, respectively. A column base portion of the thickening processed column in which both flanges of the angled material are joined to the thickening processed portion and the base plate by bolts without welding. 4. The column-base weldless joint structure for a wall-thickened column according to claim 3, wherein the bolt joining the base plate and the angle member is a one-side bolt. 5. In a joining structure in which a rising portion provided on a base plate of a column base member and a lower end of a steel pipe column are joined by bolts by stacking attachment plates, the lower end of the steel pipe column serves as a thickened portion by heat treatment. A liner plate for reducing the wall thickness of the thickened portion between the rising portion of the column base member and the rising portion of the column base member, and filling the difference in thickness between the thickened portion and the rising portion Welded joint structure of column base of thickened column with interposition of. 6. The thickened column of the thickened column according to claim 5, wherein the column base portion is not welded and joined, wherein the bolt for joining the attachment plate and the rising portion of the column base member is a one-side bolt. Welded joint structure without column base.