JPH10219700A - Joint structure of column base part and steel-made underground beam - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide joint structure of a column base part and a steel-made underground beam which can be applied to the column base part using an outer sheath pipe. SOLUTION: It is joint structure of a column base part on an embedded column base part with a lower end part of a support inserted into an outer sheath pipe 1 arranged underground and a steel-made underground beam 5 having a flange 52, and a doubling plate 21 to extend by specified length in the cross direction is connected to a side surface of the outer sheath pipe 1. Additionally, an extending part of the doubling plate 21 and the flange 52 of the steel-made underground beam 5 are bolt-connected to each other through an angular connecting member 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel underground having a column base and a flange in an embedded column base in which a lower end of the column is inserted into an outer sheath or a pipe arranged in the ground. It relates to a joint structure with a beam.

[0002]

2. Description of the Related Art A so-called boxless system is known in which a steel tube column is provided with an outer tube and a pipe for connecting the column base and an underground beam in an embedded column base of a steel pipe column. For example, it is disclosed in JP-A-63-165626.
FIG. 38 and FIG. 39 are explanatory diagrams of a so-called box-opening system disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 63-165626.
Shows a plane section, and FIG. 39 shows a side section. In the figure, 5 is a foundation beam, 1 is a sheath or tube made of a square steel tube pre-embedded in a column joint of the beam body 5,
The main reinforcement 51 of the foundation beam 5 is welded to the side surface of the outer sheath or tube 1 by welding. Reference numeral 3 denotes a steel pipe column which is built into the outer sheath or tube 1 and joined thereto. The joint between the steel pipe column 3 and the sheath tube 1 is mainly performed by mortar filled in the gap between the steel tube column 3 and the sheath tube 1, and the anchor 62 is hit on an anchor mounting plate 61 attached to the steel tube column 3. Has been reinforced by Further, the outer sheath tube 1 is also supported by the anchor muscle 63.

FIG. 40 and FIG.
No. 65626 discloses another method,
40 shows a cross-sectional plane, and FIG. 41 shows a cross-section taken along line AA of FIG. 40, respectively. This system has a structure in which a reinforcing bar 55 to be joined to the main beam main reinforcing bar 51 is arranged in a U-shape behind an outer tube 1.

However, the above-mentioned conventional method of joining an underground beam and a buried column has the following problems. That is, in the structure using the RC underground beam as shown in FIGS. 38 and 39, it may not be possible to reasonably arrange the main reinforcement 51 due to the relationship with the column base. In other words, even if it is most reasonable to arrange an odd number of main bars 51 on the strength calculation, the arrangement of the odd number is not realistic from the relationship with the column base, Therefore, an even number of main bars will be added, which is not rational in terms of economy. In addition, since the main reinforcing bar 51 is disposed outside the outer tube and the outside of the tube 1, extra cover concrete is required.

In the method of bending a reinforcing bar as shown in FIGS. 40 and 22, not only is the joining of the reinforcing bar and the periphery of the pillars complicated, but also the reliability of the bent portion in terms of the performance of the reinforcing bar is improved. It is a form that remains dissatisfied with the properties and the state of stress transmission. In addition, the construction of the foundation structure using RC underground beams requires the large-scale earth work, and then the usual RC work such as formwork production, reinforcement arrangement, and placing is performed underground. It is difficult to confirm the degree of completion of the construction. Furthermore, the need for curing requires more attention to the environment.

As described above, in the case of RC underground beams, there are various problems in terms of performance and construction. Recently, it has been considered to use steel beams instead of RC underground beams. A specific example is also shown in the invention of an integrated construction method of a steel building structure and a composite underground beam disclosed in Japanese Patent Application Laid-Open No. 60-26724. In the publication, a short pillar is erected on an independent foundation constructed underground so that the upper end side is higher than the ground surface, and a rod-shaped bracket is welded to the side surface of the short pillar. Then, a steel beam made of H steel is screwed to the bracket.

[0007]

However, in the case of Japanese Unexamined Patent Application Publication No. 60-26724, an outer tube is provided to join the column base and the underground beam. It cannot be applied to the so-called boxless system. This is because, in order to attach a bracket to an outer tube or pipe, it is necessary to provide inner diaphragms at positions above and below the bracket mounting position on the outer tube or tube in order to counter shear forces. This is because the inner diaphragm cannot be provided. Therefore, it is conceivable that a diaphragm is attached to the outer circumference of the pipe or the outer circumference of the pipe. Not.

The present invention has been made to solve such a problem, and provides a joint structure between a column base and a steel underground beam which can be applied to a column base using an outer sheath or a pipe. It is intended to be.

[0009]

A joint structure of a column base and a steel underground beam according to the present invention is an embedded column base formed by inserting a lower end of a column into an outer tube or a pipe arranged in the ground. And a joint structure of a steel underground beam having a flange, wherein a side plate extending a predetermined length in the width direction is connected to a side surface of the outer sheath or pipe, and The extension portion and the flange of the steel underground beam are bolted together via an angle-like connecting member.

Further, a channel-shaped connecting member is used in place of the angle-shaped connecting member.

Further, instead of the angle-shaped connecting member, H
It uses a shape connecting member.

Further, the attachment plate is formed in a frame shape which can be inserted into the outer sheath or tube.

[0013] Further, the attachment plate has a leg portion which can be joined to an outer side surface adjacent to a corner portion of the outer sheath or tube.

[0014] Further, there is provided a joint structure between a column base in a recessed column base in which a lower end of the column is inserted into an outer sheath or a pipe arranged in the ground, and a steel underground beam having a flange. An angle-shaped attachment plate that extends a predetermined length in the width direction and is bent inward of the steel underground beam is joined to the side surface of the outer sheath or pipe, and the extension portion of the attachment plate and the extension It is formed by bolting a flange of a steel underground beam.

Further, a gap is provided between the outer surface of the outer sheath or pipe and the end face of the steel underground beam, and a hoop is installed in the gap.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. FIG. 1 is a perspective view showing a joint structure between a column base and an underground beam according to an embodiment of the present invention, and the same parts as those in FIGS. It is. Referring to FIG. 1, the present embodiment will be described in brief. A side plate 1 extending a predetermined length in the width direction of the outer tube 1 is joined to the side portions 1 a and 1 b of the outer tube 1. The extension portion and the flange 52 of the H-shaped underground beam 5 are bolted to each other with an angle metal member 23. In addition, a side surface portion 1b adjacent to the side surface portion 1a of the outer sheath or the tube 1 includes:
The gusset plate 25 is joined by fillet welding, and the gusset plate 25 and the web 53 of the H-section underground beam 5 are formed.
Are joined via a splice plate 26.

FIG. 2 is a front view in a state before the H-shaped underground beam 5 is joined to the sheath or tube 1. The details of the attachment plate 21 will be described with reference to FIG. The attachment plate 21 is welded to each of the two side surfaces of the tube 1 by welding a predetermined distance in the vertical direction (a distance approximately equal to the underground beam 5 of the H-shaped section) to two opposite side surfaces of the pipe 1. I have. Therefore, four attachment plates 21 and the flange 5 of the H-shaped underground beam 5 are provided at one joint between the outer sheath tube 1 and the H-shaped underground beam 5.
2 will be connected. Normally, the attachment of the attachment plate 21 to the outside or the pipe is performed in advance at a factory.
In addition, a plurality of bolt joining holes 21a are formed in the extension of the attachment plate 21. The thickness, width, extension length, number of bolt holes 21a, and the like of the attachment plate 21 are appropriately set according to the size of the H-shaped section underground beam 5 to be joined, the performance required for design, and the like. . Gusset plate 25
Also, a plurality of bolt holes 25a are formed.

FIG. 3 is a front sectional view showing a state in which an H-shaped section underground beam 5 is connected to the sheath and tube 1. Next, based on FIG. 3 and FIG.
Of the connection between the attachment plate 21 and the flange 52 of the H-shaped section underground beam 5 will be described. Angle hardware 23
Has a plurality of bolt holes 23a formed at both ends of the bent portion. When joining the H-shaped section underground beam 5 to the sheath and tube 1, the two angle-shaped metal members 23
The attachment plate 21 and the flange 52 of the H-shaped underground beam 5 are arranged so as to sandwich the same, and bolts 27 are inserted into both ends of the angled metal member 23 to be joined by bolts. The gusset plate 25 and the web 53 of the H-shaped underground beam are also joined by the bolt 27 via the splice plate 26. In addition, the base plate 7 is joined to the bottom of the sheath or the tube 1 as necessary.

FIG. 4 is a cross-sectional view showing a state in which the present embodiment configured as described above is installed on a basic footing.
The construction procedure will be outlined based on FIG. First, a space for joining the outer tube 1 and the H-shaped underground beam 5 is secured in advance, and the outer tube 1 to which the attachment plate 21 is welded in advance on the foundation footing 10 provided on the ground. Is installed,
Furthermore, after fixing to the foundation footing with an anchor bolt 71 as necessary, the outer sheath tube 1 and the H-shaped section underground beam 5 are bolted together. Thereafter, grout mortar or the like is filled in the gaps between the bolted portions and fixed. Further, the column 3 is erected in the outer sheath or tube 1, and the gap between the outer sheath or the tube 1 and the pillar 3 is filled with grout mortar 4 or the like and fixed firmly. Further, the pillar 3 is filled with concrete as needed. As a countermeasure against pull-out failure of pillar 3, pillar 3
The ribs 9 are appropriately provided on the outer surface of the underground portion and the inner surface of the outer sheath and the pipe 1. The rib 9 can be replaced by a weld bead, a stud, or the like.

As in this embodiment, the attachment plate 21
When the H-shaped section beam 5 is joined to the sheath or pipe 1 by the above, a gap can be provided between the outer side of the sheath or pipe 1 and the end face of the web 53 of the H-section beam 5. As shown in FIG.
Can be wound. By winding the hoop streak 65, the load on the so-called panel zone in the outer tube 1 can be reduced, and the thickness of the outer tube 1 can be reduced. Thereby, cost can be reduced.

The method of applying the hoop streak 65 is as follows.
When the attachment plate 21 is previously joined to the sheath or tube 21 in a factory or the like, a plurality of attachment plates are arranged between the upper and lower attachment plates 21. Then, a plurality of hoop streaks 65 may be arranged at appropriate intervals at the site, stopped with a wire or the like, and cast concrete.

As described above, in the present embodiment,
Since the attachment plate 21 is welded in advance at the factory and only bolt connection is performed on site, construction defects such as welding defects are less likely to occur, and a highly reliable foundation structure can be realized. Further, since the shape of the attachment plate 21 is simple and welding at the factory is relatively simple, the construction period can be shortened.
Furthermore, when installed in the foundation footing, the labor required for arranging reinforcing bars and formwork can be reduced as compared with the conventional foundation structure. Further, according to the present embodiment, the stress transmission mechanism is clear,
With proper design, it can surpass reinforced concrete beams in toughness. Therefore, the beam cross section can be used effectively, and the beam cross section can be reduced, so that the earth separation work can be reduced.

The gusset plate 25 is not always necessary, and may not be provided when a sufficient strength can be obtained by joining the flange 52 and the attachment plate 23.
Further, in the above-described embodiment, an H-shaped section underground beam has been described as an example, but the present invention is not limited to this, and other section steels having a flange and a web as components, for example, T It can also be used for shaped steel and grooved steel.

Embodiment 2 FIG. FIG. 6 is a perspective view of another embodiment of the present invention, showing a state in which a side plate 21 is joined to the outer surface and the peripheral surface of the tube 1. In the present embodiment, the side plates 21 are joined to both sides of the outer sheath and the pipe 1 orthogonal to each other, so that the H-shaped underground beam 5 can be joined in at most four directions. FIG. 7 is a plan view showing a state in which the H-shaped underground beams 5 are joined in four directions using the attachment plates 21 joined as shown in FIG. In addition, as shown in FIG. 8, the attachment plate 21 may be formed in a cross shape, and the member thus formed may be welded to the outer side or the side surface of the pipe 1. If the extension direction of the attachment plate 21 is only one direction, the attachment plate 2
1 may be formed in a substantially T-shape. Thus, the attachment plate 21 is
By using a shape having legs that can be joined to outer surfaces adjacent to each other at the corners of the outer sheath and the pipe 1, the joining between the attachment plate and the outer sheath and the pipe can be reliably performed.

As shown in FIG. 9, the attachment plate 21 is previously assembled in a cross-girder shape to form a frame.
And may be joined to a predetermined position. By doing so, the rigidity of the attachment plate 21 can be increased, and the outer plate and the tube 1 can be stiffened, and the panel zone can be strengthened.

Although the attachment plate 21 shown in FIGS. 6 to 9 can be connected in four directions, the attachment plate 21 is extended only in a necessary direction according to the installation position of the pillar. What should I do? FIG. 10 is a plan view showing a state where the attachment plate 21 is extended in two orthogonal directions and the H-shaped underground beam 5 is joined.
FIG. 11 is a plan view showing a state where the attachment plate 21 is extended in three orthogonal directions and the H-shaped underground beam 5 is joined.
In addition, although not shown, in the case where an underground beam is joined between two columns installed at a predetermined interval, in the direction from the outer side of each column or the pipe to the opposite column. The attachment plate 21 may be provided so as to extend only.

Embodiment 3 FIG. 12 is a front view of another embodiment of the present invention. In the present embodiment, an example is shown in which the H-shaped section underground beam 5 is displaced to the left in the drawing from the axis of the pipe 1 or the outer shape. In this case, as shown in the figure, the horizontal sides of the angled hardware 23 arranged on the right side in the figure may be set to the long dimension, and the horizontal sides of the angled hardware 23 arranged on the left side may be set to the short dimension. . On the other hand, when the H-shaped section underground beam 5 is displaced to the right in the drawing with respect to the axis of the pipe 1 or the outer shape, the horizontal side of the angle-shaped metal piece 23 disposed on the left in the drawing has a long dimension. Then, the horizontal sides of the angled metal piece 3 arranged on the right side may be set to short dimensions. According to the third embodiment, the H-shaped underground beam 5 can be displaced in the left-right direction from the axis of the pipe 1 and the H-shaped section underground beam 5, so that the H-shaped section underground beam 5 and the square steel pipe column 1 increases the degree of freedom of arrangement.

In addition, as shown in FIG. 13, it is also conceivable to dispose the attachment plates 21 in the vertical direction. In this case, the joining positions of the two adjacent attachment plates 21 are shifted in the vertical direction. However, by adjusting the lengths of the vertical sides of the angled hardware 23, the joining heights of the H-shaped underground beams 5 joined to the respective orthogonal surfaces can be matched.

As a method of matching the joint height of the H-shaped section underground beam 5 without changing the length of the vertical side of the angle-shaped metal member 23, as shown in FIG. It is conceivable that the blades are arranged so that the directions of the blades are different from each other on orthogonal side surfaces. Thereby, the joining position in the height direction of the H-shaped section underground beam 5 joined to the orthogonal side surface can be matched.

FIG. 15 shows a state in which the H-shaped section beam 5 is installed at a predetermined position from the state of FIG. 14 and fastened by bolts. FIG. 14 shows an example in which the H-shaped cross-section beam 5 is horizontally moved from the side of the pipe 1 to be removed and installed. It may move in the vertical direction.

Regarding the joining of the attachment plate 21 and the outer tube 1, as shown in FIG. 16, the width (length in the vertical direction) of the joint of the attachment plate 21 and the outer tube 1 is increased. Thereby, the load borne by the welded portion between the attachment plate 21 and the sheath or the pipe 1 is reduced, and the structure can withstand a large load.

As shown in FIG. 17, one of the angled metal pieces 23 disposed inside the attachment plate 21 may be replaced with a channel-shaped connecting member 31. By using such a channel-like connecting member 31, it is possible to enhance the effect of reinforcing the frame and reduce the number of components. Further, as shown in FIG. 18, a box-shaped connecting member 30 may be used instead of the channel-shaped connecting member 31.
As shown in FIG. 18, the box-shaped connecting member 30 has a pair of opposed side surfaces and a bottom surface of a rectangular bottomed frame provided with bolt holes, and between the pair of side surfaces not provided with the bolt holes. Is provided with a rib member 30a for connecting them.
By using the box-shaped connecting member 30, the effect of reinforcing the frame can be further enhanced.

Embodiment 4 FIG. FIG. 19 is a front sectional view of another embodiment of the present invention. In the present embodiment, the angles of the angled metal pieces 23 that sandwich each flange 52 are arranged so that the directions of the angled parts 23 are opposite to each other. Then, as the directions of the angle portions are made to be opposite to each other, the width of the attachment plate 21 is enlarged, so that both the channel member 29 and the angle member 23 can be bolted thereto. In this way, by increasing the width of the attachment plate 21, the thickness of the attachment plate 21 can be suppressed.

As shown in FIG. 20, a channel member 29 having a U-shaped cross section is used instead of the angled metal members 23 arranged above the upper flange 52 and below the lower flange 52. Is also good. The use of the channel member 29 having a U-shaped cross section has an effect of suppressing horizontal deformation and rotation of the angled metal member 23. Further, it is conceivable that the vicinity of the joint portion of the flange 52 with the web 53 is deformed in the vertical direction. However, by adopting the configuration shown in FIG. 20, the channel material 29 is arranged in a portion which is easily deformed. There is also an effect that deformation can be suppressed by the thickness of the channel material 29.

Further, the width of the attachment plate 21 is increased by increasing the width of the attachment plate 21.
By bolting in two places, 1
2 and the H-shaped section beam 5 are more securely joined, and FIG.
As shown in FIG. 1, it is also possible to eliminate the necessity of removal by a gusset plate or joining of the side surface of the tube 1 to the web 53 of the H-shaped section beam 5.

In the fourth embodiment, as in the third embodiment, it goes without saying that the H-shaped cross-section beam 5 can be displaced from the outside or the axis of the pipe 1 as shown in FIG. Further, it goes without saying that the H-shaped cross-section beam 5 can be arranged so as to be displaced from the axis of the tube 1 or the other shape in other modes. By the way, when it is desired to more reliably suppress the deformation of the flange 52 near the joint with the web 53, the rib 20 may be provided near the web 53 of the channel material 29 as shown in FIG. As another means, as shown in FIGS. 24 and 25, a rib material 29a extending across both side walls may be provided inside the channel material 29.

As another means, as shown in FIG. 26, the angle-shaped metal members 23 disposed below the upper flange 52 and above the lower flange 52 are replaced with channel material having a U-shaped cross section. 35 may be used. Further, as another means, using a deformed channel material,
There are various methods such as increasing the thickness of a necessary portion of the channel material or using a box-shaped material instead of the channel material.

Embodiment 5 FIG. 27 is an explanatory diagram of another embodiment of the present invention. In the fifth embodiment,
The stiffener 40 is provided at the end of the H-shaped section beam 5. The stiffener 40 in the present embodiment is shown in FIG.
As shown in FIG.
A rectangular steel plate extending therebetween is provided on both sides of the web 53. By disposing the stiffener 40 at the end of the H-shaped section beam 5 in this manner, the cross-sectional deformation of the H-shaped section beam 5 can be suppressed. For this reason, the gusset plate 25 and the web 53 of the H-shaped cross-section beam 5 shown in the first embodiment may not need to be joined in some cases. The performance is improved.

Embodiment 6 FIG. FIG. 28 is an explanatory diagram of another embodiment of the present invention. In the present embodiment, as a member for connecting the H-shaped cross-section beam 5 and the attachment plate 21, an H-shaped steel 67 is used instead of the above-described angle-shaped hardware and channel material, and is joined by single-sheet shearing. is there. H-section steel 67
The number of hardware members can be reduced by using, and the labor and weight of construction can be reduced. In addition, since the outer sheath and the pipe 1 and the H-shaped section beam 5 are joined in the ground and reinforced by a large amount of mass concrete, the joining method as in the present embodiment has a strong strength. Deemed sufficient.

Embodiment 7 FIG. 29 is an explanatory diagram of another embodiment of the present invention. In the present embodiment, a channel material 68 is used instead of the H-shaped steel 67 in the sixth embodiment.
Is used. By using the channel material 68, the material cost can be further reduced and the weight can be reduced. In the present embodiment, FIG.
As shown in the figure, the channel material 68 provided on the upper side is disposed downward, and the channel material 68 provided on the lower side is disposed upward. Channel material 6 installed on the upper side
By arranging 8 downward, the upper end surface of the beam can be aligned with the upper end surface of the H-shaped section beam, which is convenient when hitting a floor slab.

In FIG. 29, the channel material 68 is used.
Although the example in which the side wall of the channel material 68 is disposed inside the attachment plate 21 is shown in FIG.
1 may be arranged outside. As shown in FIG. 31, a channel material 68 may be provided above the H-shaped section beam 5 and an H-shaped steel 67 may be provided below the H-shaped section beam 5. In this way, it is convenient when hitting the floor slab, and it is possible to secure certain strength and rigidity.

Incidentally, in Embodiments 1 to 7, H
When joining the cross section beam 5 to the sheath or pipe 1, the channel member 29 is bolted to the lower flange 52 in advance,
In this state, the H-shaped cross-section beam 5 is gradually lowered from the upper side to the lower side, and is disposed at a predetermined position on the side surface of the sheath or pipe 1. The channel member 29 having a U-shaped cross section is provided outside the lower flange 52.
When the H-shaped steel 67 or the channel material 68 is used, the gusset plate 25 (see FIG. 2) in which the center of the channel material 29 or the like is attached to the outer tube 1
May collide with

In such a case, for example, as shown in FIG.
A notch 29b may be provided at the center of the side end so that the gusset plate 25 passes through the notch 29b. By doing so, the H-shaped cross-section beam 5 can be straightened down along the side surface of the pipe 1 or the outer shape, and the effect that the construction at the time of construction is facilitated can be obtained. The same applies to the case of the H-shaped steel 67 or the channel material 68. Also, as for the H-shaped underground beam 5, as shown in FIG. 33, when the upper and lower flanges 52 protrude in the axial direction from the web 53, a notch 52 a is formed at the center of the lower flange 52. May be provided.

Embodiment 8 FIG. FIG. 34 is a perspective view of another embodiment of the present invention. In this embodiment, the angle-like hardware 23 is connected to the lower flange 52 of the H-shaped section underground beam 5.
Are joined in advance by welding or the like. Then, when joining the H-shaped underground beam 5 to the sheath or pipe 1, the plate 21 is attached to the gap of the angle-shaped metal piece 23 joined in advance.
Then, bolting is performed to join. In addition, FIG. 34 shows an example in which the blades of the angled metal members 23 are joined with the blades facing upward. However, as shown in FIG. 35, the joining may be performed with the blades of the angle-shaped metal members 23 facing down.

According to this embodiment, it is not necessary to bolt the bottom (in this case, the lower end flange 52 of the H-shaped section underground beam 5) which is difficult to work at the site of the foundation work, so that the working efficiency is improved. improves.

Embodiment 9 FIG. FIG. 36 is an explanatory diagram of another embodiment of the present invention. In the present embodiment, an attachment plate 22 made of an angled metal is used instead of the attachment plate 21 made of a flat plate in the above embodiment. That is, one piece 22a of the attachment plate 22 (a vertical piece, hereinafter referred to as a "vertical piece") is welded to the side wall 1a of the sheath or tube 1, and the other piece 22b (a horizontal piece;
Hereinafter, it is referred to as “horizontal piece”. ) Is arranged so as to bend toward the outside or the inside of the tube 1. In addition, horizontal piece 2
2b (horizontal direction), a portion which comes into contact with the outer side or the side surface 1a of the tube 1 is cut off so that the horizontal piece 22b and the outer side or the tube 1 can make surface contact.

According to the ninth embodiment, the horizontal piece 22b of the attachment plate 22 also serves as the angle-shaped metal member 23 for joining the attachment plate 22 and the H-shaped underground beam 5, so that the attachment plate is used as an attachment plate. The number of the angled metal pieces 23 may be half that of the case where a flat plate is used. As shown in FIG. 37, by installing the plate 24 on the attachment plate 22 so as to be parallel to the horizontal piece 22b of the attachment plate 22, the angle-shaped hardware 23 can be eliminated.

As described above, according to the present embodiment, the number of the angle-shaped hardware 23 used is only half that in the case of the above-described first embodiment, so that the material can be reduced. Further, in the case where the plate 24 is attached to the attachment plate 22, the angle member 23 is not required at all, and the material can be further reduced.

Although the above description has been given of the column base of the outer shape or the tube type, it is needless to say that the same technique can be applied to an embedded column base in which the lower end of the column is embedded.

[0050]

As described above, according to the present invention, the attachment plate is previously joined to the outer side or the pipe side, and the attachment plate and the flange of the steel underground beam are bolted together via the angle member. As a result, the construction is simple and excellent in strength, and a highly reliable joint structure between the column base and the steel underground beam can be obtained.

Further, since the channel-like connecting member is used instead of the angle-like connecting member, the rigidity of the connecting portion can be increased. In addition, when connecting between the adjacent attachment plates by one channel-shaped connecting member, the number of parts and the weight can be reduced, and the construction becomes easy.

Further, since the H-shaped connecting member is used instead of the angle-shaped connecting member, the number of parts can be reduced, and
Construction is also easy.

Further, since the attachment plate is formed in a frame shape which can be inserted into the detachment or the tube, the joining between the attachment plate and the detachment or the tube is ensured, the rigidity of the attachment plate itself is increased, and the panel as a whole is increased. The rigidity of the zone can be increased.

Further, since the attachment plate has a leg portion which can be joined to the outer surface adjacent to the outer corner at the corner of the outer tube, the joining between the attachment plate and the outer tube can be surely performed. .

Further, the attachment plate is detached and extended to the side surface of the pipe by a predetermined length in the width direction thereof, and is formed into an angle shape which is bent inward of the steel underground beam. Since the flange portion of the center beam is bolted, the number of members and the number of construction steps are reduced, and an economical effect is obtained.

Further, since a gap is provided between the outer surface of the outer sheath or the pipe and the end face of the steel underground beam, and a hoop streak is provided in the gap, the load of the so-called panel zone in the outer sheath or the pipe is reduced. It can be reduced, and the thickness of the tube can be reduced. Thereby, cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of Embodiment 1 of the present invention.

FIG. 2 shows an outer sheath 1 according to the first embodiment of the present invention.
It is a front view of the state before the shape section underground beam 5 is joined.

FIG. 3 is a front view of the first embodiment of the present invention.

FIG. 4 is an explanatory diagram illustrating an installation operation according to the first embodiment of the present invention.

FIG. 5 is an explanatory diagram illustrating an installation state of a hoop streak according to Embodiment 1 of the present invention.

FIG. 6 is a diagram showing an outer sheath tube 1 according to a second embodiment of the present invention;
FIG. 4 is a perspective view of a state before the shaped section underground beam 5 is joined.

FIG. 7 is a plan view of a second embodiment of the present invention.

FIG. 8 is a diagram showing another mode of the attachment plate 21 according to the second embodiment of the present invention.

FIG. 9 is a view showing another aspect of the attachment plate 21 according to the second embodiment of the present invention.

FIG. 10 is a plan view of another aspect of the second embodiment of the present invention.

FIG. 11 is a plan view of another aspect of the second embodiment of the present invention.

FIG. 12 is a front view of a third embodiment of the present invention.

FIG. 13 is an explanatory diagram of another aspect of the third embodiment of the present invention.

FIG. 14 is an explanatory diagram of another aspect of the third embodiment of the present invention.

FIG. 15 is an explanatory view of another aspect of the third embodiment of the present invention (bolted state).

FIG. 16 is an explanatory diagram of another aspect of the third embodiment of the present invention.

FIG. 17 is an explanatory diagram of another aspect of the third embodiment of the present invention.

FIG. 18 is an explanatory diagram of another aspect of the third embodiment of the present invention.

FIG. 19 is a front view of a fourth embodiment of the present invention.

FIG. 20 is a front view of another aspect of the fourth embodiment of the present invention.

FIG. 21 is a front view of another aspect of the fourth embodiment of the present invention.

FIG. 22 is a front view of another aspect of the fourth embodiment of the present invention.

FIG. 23 is a front view of another aspect of the fourth embodiment of the present invention.

FIG. 24 is an explanatory diagram of components used in Embodiment 4 of the present invention.

FIG. 25 is a front view of another aspect of the fourth embodiment of the present invention.

FIG. 26 is a front view of another aspect of the fourth embodiment of the present invention.

FIG. 27 is an explanatory diagram of Embodiment 5 of the present invention.

FIG. 28 is a front view of the sixth embodiment of the present invention.

FIG. 29 is a front view of a seventh embodiment of the present invention.

FIG. 30 is a front view of another aspect of the seventh embodiment of the present invention.

FIG. 31 is a front view of another aspect of the seventh embodiment of the present invention.

FIG. 32 is an explanatory diagram of another mode of the first to seventh embodiments of the present invention.

FIG. 33 is an explanatory diagram of another mode of the first to seventh embodiments of the present invention.

FIG. 34 is a perspective view of an eighth embodiment of the present invention.

FIG. 35 is a perspective view of another mode of the eighth embodiment of the present invention.

FIG. 36 is an explanatory diagram of Embodiment 9 of the present invention.

FIG. 37 is an explanatory diagram of another mode of the ninth embodiment of the present invention.

FIG. 38 is a plan view showing a conventional technique.

FIG. 39 is a side sectional view showing the conventional technique shown in FIG. 38;

FIG. 40 is a plan view showing another conventional technique.

FIG. 41 is a side sectional view showing the conventional technique shown in FIG. 40;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sheath pipe 3 Square steel pipe column 5 H-shaped section underground beam 21 Attached plate 23 Angled metal 27 Joint bolt 29 Channel material 52 Flange 53 Web

Continuing on the front page (72) Inventor Hisaya Kamura 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Inventor Tadashi Teruyama 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Inside the corporation

Claims (7)

[Claims] 1. A joint structure between a column base and a steel underground beam having a flange in an embedded column base in which a lower end of the column is inserted into an outer sheath or a pipe arranged in the ground. Then, a side plate extending a predetermined length in the width direction is joined to the side surface of the outer sheath or the pipe, and the extending portion of the side plate and the flange of the steel underground beam are connected via an angle-like connecting member. A joint structure between a column base and a steel underground beam, characterized by being joined by bolts. 2. A joint structure between a column base and a steel underground beam according to claim 1, wherein a channel-like connecting member is used in place of said angle-like connecting member. 3. The joint structure according to claim 1, wherein an H-shaped connecting member is used instead of the angle-shaped connecting member. 4. The column base and the steel underground according to claim 1, wherein the attachment plate is formed in a frame shape that can be inserted into the outer sheath or the pipe. Beam joint structure. 5. The column-base portion according to claim 1, wherein the attachment plate has a leg portion that can be joined to an outer side surface adjacent at a corner portion of the outer sheath or the tube. And steel underground beam joint structure. 6. A joint structure between a column base and a steel underground beam having a flange in an embedded column base in which a lower end of the column is inserted into an outer sheath or a pipe arranged in the ground. Along with the outer sheath or the side surface of the pipe, a predetermined length is extended in the width direction thereof, and an angle-shaped attachment plate that is bent inward of the steel underground beam is joined, and the extension portion of the attachment plate and the extension portion are connected to each other. A joint structure between a column base and a steel underground beam, which is formed by bolting a flange of a steel underground beam. 7. A gap is provided between an outer surface of the outer sheath or the pipe and an end face of the steel underground beam, and a hoop is installed in the gap. The joint structure of the column base and the steel underground beam described in the above.