JP7509566B2 - Joint metal fittings and joint structures - Google Patents

Description

The present invention relates to a metal joint used to secure the ends of column members or braces that form part of an architectural structure to structures such as foundations or beams made of concrete, and to a joint structure that uses the metal joint.

In architectural structures such as steel or SRC structures, a joint structure is known in which a column member made of a square steel pipe or a round steel pipe is erected on a foundation formed of concrete, and the upper end of an anchor bolt buried in the foundation concrete is connected to a metal joint welded to the lower end of the column member (see, for example, Figure 4 of Patent Document 1).

In addition, in architectural structures such as steel or SRC structures, reinforcing members called braces that connect column members and beam members diagonally are sometimes installed to improve the strength of the architectural structure, and in the above-mentioned joint structure, in order to fix the end of such a brace to the column base, a plate-shaped member called a gusset plate is sometimes installed on the joint metal provided at the lower end of the column member (see, for example, the lower right and lower left of Figure 5 in Patent Document 2).

Figures 8 and 9 are figures to be referred to in order to explain a conventional joint metal 4 and a conventional joint structure 2 using the same.

As shown in FIG. 8, the conventional joint structure 2 includes a column member 5 erected on foundation concrete 3, a joint metal 4 attached to the lower end of the column member 5, a brace 6 extending diagonally upward from the lower end of the column member 5, and a number of anchor bolts 8 embedded inside the foundation concrete 3.

As shown in FIG. 9, the conventional joint metal 4 has a predetermined thickness and is formed as a plate with a roughly square planar shape, and near the four corners of its upper surface, a bolt insertion hole 4a is formed at each of the four corners, penetrating the joint metal 4 in the thickness direction.

The metal joint 4 is made of a steel material with sufficient strength, and as shown in FIG. 8, is fixed to the lower end of the column member 5 by welding or the like, and the column member 5 is erected on the foundation concrete 3 via a mortar layer 9 provided between the lower surface of the metal joint 4 and the surface of the foundation concrete 3.

On the other hand, as shown in FIG. 8, multiple anchor bolts 8 are embedded inside the foundation concrete 3, and the upper ends of these anchor bolts 8 are inserted through the mortar layer 9 into bolt insertion holes 4a formed in the connecting metal 4, and nuts 10 are fastened to the upper threaded portions of the anchor bolts 8 that protrude above the top surface of the connecting metal 4.

As shown in FIG. 8, a gusset plate 7 formed in a substantially rectangular plate shape with a predetermined thickness in the direction perpendicular to the plane of the drawing is provided at the corner between the outer surface of the lower end of the column member 5 and the upper surface of the metal joint 4.

The gusset plate 7 was made of a steel material with sufficient strength, and was fixed integrally to the column member 5 and the metal joint 4 by welding along the outer surface of the lower end of the column member 5 and the contact area with the upper surface of the metal joint 4.

As shown in Figure 8, a brace 6 is provided so as to extend diagonally upward (towards the upper left in the figure) from the lower end of the column member 5, and one end of the brace 6 in the longitudinal direction is connected to a gusset plate 7 and fixed with a bolt or the like, while the opposite end of the brace 6 in the longitudinal direction is fixed to another column member or beam member.

This type of joint metal 4 and the joint structure 2 using it can prevent the column members of an architectural structure from tilting or falling over when an external force due to an earthquake or the like acts on the base of the column member 5.

In other words, as shown in Figure 8, when a bending moment M acts on the base of the column member 5 due to an external force such as an earthquake, a bending moment that resists the bending moment M acts on the base of the column member 5 due to the tensile force T generated in the anchor bolt 8 on the left side of the figure and the compressive force C from the foundation concrete 3 generated through the mortar layer 9 on the right side of the underside of the connecting metal 4.

By installing the braces 6 diagonally between the column members 5 and beam members of the architectural structure, the forces acting on these column members 5 and beam members can be borne by the braces 6 as axial force (force acting in the longitudinal direction of the braces 6), thereby improving the strength of the architectural structure.

However, in a joint structure 2 using such conventional joint metal fittings 4, there was a risk that the force acting on the base of the column member 5 in the shear direction (the left-right direction in FIG. 8, or the direction perpendicular to the paper surface of the figure) would be concentrated on the anchor bolt 8.

Therefore, in order to prevent this and efficiently transmit the shear force acting on the column base to the foundation concrete, a joint structure was known in which a protrusion called a shear cotter was provided on the underside of the joint metal, and this protrusion was embedded inside the foundation concrete (see, for example, Figure 5 of Patent Document 1).

Figures 10 and 11 are figures to be referred to in order to explain another conventional joining metal 14 used in such a joining structure, and another conventional joining structure 12 using the same.

The conventional joint structure 12 differs in configuration from the conventional joint structure 2 in that a joint metal 14 as shown in FIG. 11 is provided instead of the joint metal 4 in the joint structure 2 shown in FIG. 8.

As shown in FIG. 11, a conventional metal joint 14 has a base plate 16 that has a predetermined thickness and is formed into a plate shape with a substantially square planar shape, and a bolt insertion hole 16a that penetrates the base plate 16 in the thickness direction is formed near each of the four corners of the upper surface.

Then, on the underside of the base plate 16 of the metal joint 14, as shown in FIG. 11(a), a protrusion 18 having a horizontal cross-sectional shape formed in an approximately cross shape was provided so as to protrude downward from the underside of the base plate 16 as shown in FIG. 11(b).

Conventionally, such metal joints 14 were made by welding steel plates cut to a specified size together in a cross shape to create a protrusion 18, which was then welded and fixed to the underside of a conventional metal joint 4 as shown in Figure 9.

As shown in FIG. 10, the metal joint 14 is fixed to the lower end of the column member 5 by welding or the like, and the column member 5 is erected on the foundation concrete 3 via a mortar layer 9 provided between the lower surface of the base plate 16 and the surface of the foundation concrete 3.

At this time, the protrusion 18 provided on the underside of the base plate 16 of the metal joint 14 was embedded inside the foundation concrete 3 so that its lower end was located below the surface of the foundation concrete 3, as shown in Figure 10.

And, just like the conventional joint structure 2 shown in Figure 8, a gusset plate 7 is provided at the corner between the outer surface of the lower end of the column member 5 and the upper surface of the joint metal 4, and one end of the brace 6 in the longitudinal direction is connected to the gusset plate 7 and fixed with a bolt or the like.

The rest of the configuration is the same as the conventional joint metal 4 and the conventional joint structure 2 using the same, so even with this type of joint metal 14 and the joint structure 12 using the same, when an external force due to an earthquake or the like acts on the base of the column of the architectural structure, the strength of the architectural structure is improved and the column members of the architectural structure are prevented from tilting or falling over.

The joint metal 14 and the joint structure 12 using it prevent the shear force (horizontal force) acting on the base of the column member 5 from concentrating on the anchor bolt 8, and the shear force acting on the base of the column member 5 can be efficiently transmitted to the foundation concrete 3.

In other words, as shown in FIG. 10, the shear force F acting on the base of the column member 5 due to an external force such as an earthquake can be borne by each surface of the protruding portion 18 of the metal joint 14 embedded inside the foundation concrete 3.

On the other hand, the ends of braces installed diagonally between column members or beam members may be fixed to the middle of the length of a beam made of concrete (see, for example, the lower center of Figure 4 of Patent Document 2). In such cases, a gusset plate for fixing the end of the brace to the middle of the length of the beam member may be provided using a joint metal having a configuration similar to that of the joint metal 2, 12 shown in Figures 9 and 11.

That is, as shown in Figs. 12(a) and (b), similar to the joint structures 2 and 12 shown in Figs. 8 and 10, joint metals 4 and 14 are placed in the middle of the foundation beam 13 via a mortar layer 9 and fixed using anchor bolts 8 and nuts 10, and a gusset plate 17 formed in a plate shape with a predetermined thickness in the direction perpendicular to the paper surface of the figure is fixed by welding or the like to the top surface of the joint metal 4 and the top surface of the base plate 16 of the joint metal 14, and the ends of each of the two braces 6 are connected to the gusset plate 17 and fixed by bolts or the like, in joint structures 19 and 20.

JP 2000-319990 A Japanese Patent Application Laid-Open No. 62-101737

However, the conventional joint metal 14 and the joint structures 12, 20 using it as described above have the problem that the manufacturing process of the joint metal 14 and the construction process of the joint structures 12, 20 require a large number of welding steps, which may lead to increased costs.

In other words, in the manufacturing process of conventional joint metal fittings 14, welding work was required when creating the protrusions 18 and fixing them to the underside of the base plate 16. Furthermore, the shape and height of the protrusions 18 fixed to the base plate 16 and the fixing position on the underside of the base plate 16 affect the installation height and level when erecting the column members 5 and fixing the braces 6, so the welding work had to be performed accurately and carefully with sufficient precision.

In addition, in the construction process of the joint structures 12, 20 using the conventional joint metal 14, welding work is required when fixing the column member 5 and the gusset plates 7, 17 to the joint metal 14, and similarly, the welding work needs to be performed accurately and carefully with sufficient precision.

As such, in the conventional joint metal 14 and the joint structures 12, 20 using it, the number of welding steps increases and each welding operation becomes complicated, which may increase the manufacturing costs of the joint metal 14 and the construction costs of the joint structures 12, 20.

In view of the above problems, the present invention aims to provide a metal joint and a joint structure using the same that can efficiently transmit shear forces to structures such as foundations and beams made of concrete, reduce the number of welding steps required to manufacture the metal joint and to construct the joint structure, and prevent increases in costs by making each step more efficient.

In order to solve the above problems, the metal joint according to the present invention has the following features:
A metal joint provided on a structure formed of concrete,
A plate-shaped base plate having a through hole formed on an upper surface thereof and penetrating in a thickness direction;
a penetrating member that is inserted into the through hole of the base plate and is integrally fixed to the base plate,
An end of a brace is fixed to a horizontal end of a portion of the penetrating member that protrudes from the upper surface of the base plate,
The present invention is characterized in that the lower end of the portion of the penetrating member that protrudes from the lower surface of the base plate is positioned below the surface of the concrete and is configured to be embedded inside the concrete.

In addition, the metal joint according to the present invention is
The penetrating member has a horizontal cross-sectional shape that is substantially the same as a horizontal cross-sectional shape of the through hole.

In addition, the metal joint according to the present invention is
The penetrating member is characterized in that its horizontal cross section is formed into a substantially cross shape.

In addition, the metal joint according to the present invention is
The opening of the through hole opening on both the upper and lower surfaces of the base plate is characterized in that a tapered portion is formed so that the horizontal cross-sectional shape of the opening gradually becomes larger toward both the upper and lower surfaces of the base plate.

In addition, the metal joint according to the present invention is
The penetrating member is integrally formed by casting or forging, and is fixed to the base plate by welding.

In addition, the metal joint according to the present invention is
The metal joint is provided at the lower end of a pillar member erected on a foundation formed of concrete,
The base plate is formed so that a planar shape thereof is larger than a horizontal cross-sectional shape of the pillar member, and a lower end portion of the pillar member is fixed to an upper surface of the base plate,
The present invention is characterized in that the horizontal end of the portion of the penetrating member that protrudes from the upper surface of the base plate is formed so as to be positioned outside the outer surface of the pillar member.

In addition, the metal joint according to the present invention is
The metal joint is characterized in that it is provided at the midpoint of the length of a beam made of concrete.

In addition, the joint structure according to the present invention is
A joint structure using a metal joint provided on a structure formed of concrete,
A plate-shaped base plate having a through hole formed on an upper surface thereof and penetrating in a thickness direction;
a penetrating member that is inserted into the through hole of the base plate and is integrally fixed to the base plate,
An end of a brace is fixed to a horizontal end of a portion of the penetrating member that protrudes from the upper surface of the base plate,
This is characterized in that the lower end of the portion of the penetrating member that protrudes from the underside of the base plate is located below the surface of the concrete and uses a metal joint that is embedded inside the concrete.

According to the metal joint of the present invention,
A metal joint provided on a structure formed of concrete,
A plate-shaped base plate having a through hole formed on an upper surface thereof and penetrating in a thickness direction;
a penetrating member that is inserted into the through hole of the base plate and is integrally fixed to the base plate,
An end of a brace is fixed to a horizontal end of a portion of the penetrating member that protrudes from the upper surface of the base plate,
The lower end of the portion of the penetrating member that protrudes from the lower surface of the base plate is positioned below the surface of the concrete and is configured to be embedded inside the concrete,
This enables the efficient transmission of shear force to structures such as foundations and beams made of concrete, while reducing the amount of welding work required to manufacture the connecting metal fittings and construct the connecting structure, thereby making each task more efficient and preventing increases in costs.

Further, according to the joint structure of the present invention,
A joint structure using a metal joint provided on a structure formed of concrete,
A plate-shaped base plate having a through hole formed on an upper surface thereof and penetrating in a thickness direction;
a penetrating member that is inserted into the through hole of the base plate and is integrally fixed to the base plate,
An end of a brace is fixed to a horizontal end of a portion of the penetrating member that protrudes from the upper surface of the base plate,
The lower end of the portion of the penetrating member that protrudes from the lower surface of the base plate is located below the surface of the concrete, and a metal joint is used that is embedded inside the concrete.
This enables the efficient transmission of shear force to structures such as foundations and beams made of concrete, while reducing the amount of welding work required to manufacture the connecting metal fittings and construct the connecting structure, thereby making each task more efficient and preventing increases in costs.

1 is a schematic side view showing a joint structure 22 between a brace 6 and a column base using a metal joint 24 according to one embodiment of the present invention. FIG. 2A is a diagram showing the metal joint 24 shown in FIG. 1, FIG. 2A being a perspective view thereof, and FIG. 2B being a cross-sectional view taken along line AA in FIG. 2A. 3(a) and 3(b) are cross-sectional views taken along line B-B in FIG. 3(a), and FIG. 3(c) are cross-sectional views taken along line CC in FIG. 3(a). 4A and 4B are diagrams showing a penetrating member 28 of a metal joint 24, with FIG. 4A being a plan view thereof and FIG. 4B being a side view thereof. 5A and 5B are diagrams showing the state in which the joint metal fitting 24 is attached to the lower end of the pillar member 25, with FIG. 5A being a side view and FIG. 5B being a cross-sectional view taken along line D-D in FIG. 5A. This is a diagram showing a different form of the penetrating member 28 of the joint metal 24, and is a cross-sectional view taken along line D-D in Figure 5 (a). A schematic side view showing a joint structure 29 between a brace 6 and a foundation beam 13 using a metal joint 24. 1 is a schematic side view showing a conventional joint structure 2 between a brace 6 and a column base using a conventional joint metal 4. 9A and 9B are diagrams showing the metal joint 4 shown in FIG. 8, with FIG. 9A being a plan view thereof and FIG. 9B being a side view thereof. 1 is a schematic side view showing a conventional joint structure 12 between a brace 6 and a column base using a conventional joint metal 14. 11A and 11B are diagrams showing the metal joint 14 shown in FIG. 10, with FIG. 11A being a plan view thereof and FIG. 11B being a side view thereof. FIG. 12(a) is a schematic side view showing a conventional joint structure 19 between a brace 6 and a foundation beam 13 using a conventional connecting metal 4, and FIG. 12(b) is a schematic side view showing a conventional joint structure 20 between a brace 6 and a foundation beam 13 using a conventional connecting metal 14.

Below, the embodiments for implementing the metal joint according to the present invention and the joint structure using the metal joint will be described in detail with reference to the drawings. Note that parts similar to the conventional metal joints 4 and 14 and the conventional joint structures 2, 12, 19, and 20 using the metal joints shown in Figures 8 to 12 will be described with the same reference numerals, with some exceptions.

Figures 1 to 5 are figures to be referred to in order to explain a metal joint 24 according to one embodiment of the present invention and a joint structure 22 using the same.

As shown in FIG. 1, the joint structure 22 includes a column member 25 erected on the foundation concrete 3, a joint metal 24 attached to the lower end of the column member 25, a brace 6 extending diagonally upward from the lower end of the column member 25, and a number of anchor bolts 8 embedded inside the foundation concrete 3.

The column member 25 is a rectangular steel pipe (see Figure 5) formed into a rectangular tube shape with a horizontal cross section that is approximately square. As shown in Figure 1, it is erected so as to extend vertically on the foundation concrete 3, and a metal joint 24 is fixed integrally to its lower end.

As shown in Figures 2(a) and (b), the metal joint 24 comprises a plate-shaped base plate 26 having a predetermined thickness dimension, and a penetrating member 28 that is arranged to penetrate the base plate 26 in the thickness direction.

As shown in FIG. 3(a), the base plate 26 of the joining metal fitting 24 has a predetermined thickness dimension in the direction perpendicular to the plane of the drawing, and is formed as a roughly rectangular plate in plan view. A bolt insertion hole 26a is formed near each of the four corners of the upper surface, penetrating the base plate 26 in the thickness direction.

A through hole 26b is formed in the approximate center of the upper surface of the base plate 26, penetrating the base plate 26 in the thickness direction and having an approximately cross-shaped horizontal cross section.

That is, as shown in FIG. 3(a), the through hole 26b is formed such that the first long hole portion 26c penetrates the base plate 26 in the thickness direction and has a cross-sectional shape that is approximately rectangular and elongated in the left-right direction of the base plate 26 in the figure, and the second long hole portion 26d has a cross-sectional shape that is approximately rectangular and elongated in the up-down direction of the base plate 26 in the figure, with the center portions of their lengths intersecting at approximately right angles at approximately the center of the base plate 26 so that the holes communicate with each other.

The opening of the through hole 26b that opens on both the upper and lower surfaces of the base plate 26 has a tapered portion 26e formed along the edge of each opening of the through hole 26b, the horizontal cross-sectional shape of the opening of the through hole 26b gradually increasing toward both the upper and lower surfaces of the base plate 26.

As shown in FIG. 4(b), the through member 28 of the joining metal fitting 24 has a predetermined height in the vertical direction in the figure, and as shown in FIG. 4(a), its horizontal cross-sectional shape is formed into a roughly cross shape that is roughly the same as the horizontal cross-sectional shape of the through hole 26b of the base plate 26.

In other words, as shown in FIG. 4(a), the penetrating member 28 is formed so that a first vertical plate portion 28a having a predetermined thickness in the vertical direction and a predetermined width in the horizontal direction in the figure, and a second vertical plate portion 28b having a predetermined thickness in the horizontal direction and a predetermined width in the vertical direction in the figure intersect at approximately right angles at the center of their respective widths and are integrally joined together.

The width dimension of the first vertical plate portion 28a of the through-hole member 28 is formed to be approximately the same as the length dimension of the first long hole portion 26c of the through-hole 26b of the base plate 26, and the thickness dimension of the first vertical plate portion 28a is formed to be approximately the same as the dimension in the width direction perpendicular to the length direction of the first long hole portion 26c.

The width dimension of the second vertical plate portion 28b of the through-hole member 28 is formed to be approximately the same as the length dimension of the second long hole portion 26d of the through-hole 26b of the base plate 26, and the thickness dimension of the second vertical plate portion 28b is formed to be approximately the same as the dimension in the width direction perpendicular to the length direction of the second long hole portion 26d.

As shown in FIG. 2, such a penetrating member 28 is inserted into the through hole 26b of the base plate 26 and engages with the through hole 26b at a position about midway up its height, and is positioned so that the upper end of the penetrating member 28 protrudes above the upper surface of the base plate 26 and the lower end of the penetrating member 28 protrudes below the lower surface of the base plate 26.

The penetrating member 28 is fixed integrally to the base plate 26 by continuously welding the side of the penetrating member 28 to the openings at both upper and lower ends of the through hole 26b in the base plate 26 along the welds W provided on the edges of the openings at both upper and lower ends of the through hole 26b.

The base plate 26 and the penetrating member 28 of such a joining member 24 are made of a steel material having sufficient strength, and the strength of the penetrating member 28 can be improved by integrally forming the penetrating member 28 by casting or forging.

As shown in FIG. 5(a), such a metal joint 24 is positioned so that the lower end surface of the column member 25 abuts against the upper surface of the base plate 26 of the metal joint 24.

At this time, as shown in FIG. 5(b), the base plate 26 of the joining metal fitting 24 is formed so that its outer shape is larger than the horizontal cross-sectional shape of the column member 25, and the bolt insertion hole 26a of the base plate 26 is formed so that it is positioned outside the outer surface of the lower end of the column member 25.

The through-hole 26b of the base plate 26 is inserted into the through-hole 26b of the base plate 26, and the first vertical plate portion 28a and the second vertical plate portion 28d are formed so that both ends in the longitudinal direction (left-right direction or up-down direction in FIG. 5(b)) are positioned outside the outer surface of the lower end of the pillar member 25.

As shown in Figures 5(a) and (b), the lower end of the pillar member 25 has a substantially U-shaped slit 25a that opens downward in cross section, approximately at the center of each of the four sides that make up the horizontal cross section of the substantially square shape.

The horizontal width of these slits 25a is formed to be approximately the same as the thickness of the first vertical plate portion 28a and the second vertical plate portion 28b of the penetrating member 28, and the vertical depth is formed to be approximately the same as the height of the portion of the penetrating member 28 that protrudes from the upper surface of the base plate 26.

As a result, as shown in FIG. 5, the first vertical plate portion 28a and the second vertical plate portion 28b of the penetrating member 28 protruding from the upper surface of the base plate 26 of the connecting metal fitting 24 are positioned to fit inside the slit 25a of the column member 25, so that the connecting metal fitting 24 can be positioned at the lower end of the column member 25 without the penetrating member 28 interfering with the column member 25.

Then, the lower end surface of the pillar member 25 and the upper surface of the base plate 26 of the joint metal 24, the slit 25a of the pillar member 25 and the penetrating member 28 of the joint metal 24, etc. are welded along the periphery of the lower end of the pillar member 25 and the edge of the slit 25a, so that the joint metal 24 is fixed integrally to the lower end of the pillar member 25.

Then, the column member 25 with the metal joint 24 fixed to its lower end in this manner is erected on the foundation concrete 3 via a mortar layer 9 provided between the metal joint 24 and the foundation concrete 3, as shown in Figure 1.

At this time, the portion of the penetrating member 28 of the joint metal fitting 24 that protrudes to the underside of the base plate 26 is embedded inside the foundation concrete 3 so that its lower end is located below the surface of the foundation concrete 3.

Meanwhile, as shown in FIG. 1, multiple anchor bolts 8 are embedded inside the foundation concrete 3 so that their length extends vertically inside the foundation concrete 3 and their upper ends protrude above the surface of the foundation concrete 3.

The upper ends of these anchor bolts 8, as shown in FIG. 1, penetrate the mortar layer 6 in the vertical direction in the figure and are loosely inserted from below into bolt insertion holes 26a formed in the base plate 26 of the joint metal fitting 24, and nuts 10 are fastened to the upper threaded portions of the anchor bolts 8 that protrude above the top surface of the base plate 26.

As shown in FIG. 1, a brace 6 is provided extending diagonally upward (toward the upper left in the figure) from the lower end of the pillar member 25.

The brace 6 is formed, for example, from an I-beam, an H-beam, or a round bar steel, and one end of the brace 6 in the longitudinal direction is connected to the part of the penetrating member 28 of the connecting metal fitting 24 that protrudes from the top surface of the base plate 26, which is outside the outer surface of the column member 25, and is fixed by a bolt or the like, and the opposite end of the brace 6 in the longitudinal direction is fixed to another column member or beam member.

In other words, the part of the penetrating member 28 of the joint metal 24 that protrudes from the top surface of the base plate 26, outside the outer surface of the column member 25, can be used as a gusset plate for attaching the brace 6.

This type of joint metal 24 and the joint structure 22 using it can efficiently transmit the shear force acting on the base of the column of the architectural structure to the foundation concrete.

In other words, the portion of the penetrating member 28 of the metal joint 24 that protrudes from the underside of the base plate 26 can be used as a shear cotter to efficiently transmit the shear force acting on the column base to the foundation concrete.

The joint metal 24 and the joint structure 22 using it can reduce the amount of welding work required to manufacture the joint metal and construct the joint structure, making each task more efficient.

In other words, the connecting metal fittings 24 are fixed by inserting the penetrating members 28 into the through holes 26b of the base plate 26 and welding them together, so that the shear cotter for efficiently transmitting the shear force acting on the column base to the foundation concrete and the gusset plate for fixing the brace 6 to the column base can be fixed simultaneously, thereby reducing the number of welding steps.

In addition, since the penetrating member 28 is inserted into the through hole 26a of the base plate 26 of the joining metal fitting 24, the penetrating member 28 (shear cotter or gusset plate) can be easily positioned horizontally on the upper or lower surface of the base plate 26.

In addition, a tapered portion 26c is formed along the edge of the opening of the through hole 26b of the base plate 26 of the joining hardware 24, making it easier for the penetrating member 28 to be inserted into the through hole 26b, and the groove angle of the welded portion W is smaller, so the amount of welding can be reduced and deformation of the penetrating member 28 and base plate 26 due to heat during welding can be prevented.

In addition, the first vertical plate portion 28a and the second vertical plate portion 28b of the penetrating member 28 are positioned to fit inside the slits 25a formed on each side of the pillar member 25, so that the horizontal positioning of the lower end of the pillar member 25 on the upper surface of the base plate 26 can be easily performed.

In addition, because the portion of the penetrating member 28 that protrudes from the upper surface of the base plate 26 is welded to the pillar member 25, the lower end of the pillar member 25 can be reinforced without providing a new reinforcing rib.

In this way, the joint metal 24 of this embodiment and the joint structure 22 using it can efficiently transmit shear forces to structures such as foundations and beams made of concrete, while reducing the amount of welding work required to manufacture the joint metal and construct the joint structure, and by making each task more efficient, it is possible to prevent an increase in costs.

The present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the invention to achieve its objectives.

For example, in the joint metal fittings 24 and the joint structure 22 using the same according to the above embodiment, both ends in the longitudinal direction of the first vertical plate portion 28a and the second vertical plate portion 28b of the penetrating member 28, whose horizontal cross-sectional shape is formed in a substantially cross shape, are positioned outside the outer surface of the lower end of the column member 25, but it is sufficient that the portion of the penetrating member 28 used as a gusset plate for attaching the brace 6 is positioned outside the outer surface of the lower end of the column member 25.

For example, as shown in FIG. 6(a), both ends of the second vertical plate portion 28b of the penetrating member 28 in the longitudinal direction (the vertical direction in the figure) may be formed to be positioned inside the lower end portion of the pillar member 25.

Also, as shown in FIG. 6(b), the penetrating member 28 may be composed only of a first vertical plate portion 28a having a predetermined thickness in the up-down direction in the figure and a predetermined width in the left-right direction in the figure.

In addition, in the joint metal 24 according to the above embodiment and the joint structure 22 using the same, the joint metal 24 is provided at the lower end of the column member 25 erected on the foundation concrete 3, but similar to the joint structures 19 and 20 shown in FIG. 12, the joint metal 24 may be used to fix the end of a brace midway along the length of a beam formed from concrete.

In other words, as shown in FIG. 7, a joint metal 24 may be placed midway through the length of the foundation beam 13, with the lower end of the penetrating member 28 embedded inside the foundation beam 3 via a mortar layer 9, and fixed using an anchor bolt 8 and a nut 10. A joint structure 29 may be used in which one end of each of the two braces 6 in the length direction is connected to the portion of the penetrating member 28 that protrudes above the top surface of the base plate 26 and fixed with a bolt or the like.

In addition, in the joint metal fitting 24 according to the above embodiment, the base plate 26 has a planar shape that is substantially rectangular, but the planar shape of the base plate 26 may be a regular octagon or circle, or any other shape other than a rectangle or square.

In addition, in the joining hardware 24 according to the above embodiment, the base plate 26 has four bolt insertion holes 26a, one at each of the four corners. However, the number of bolt insertion holes 26a formed in the base plate 26 may be more than four, and the bolt insertion holes 26a may be formed at positions other than the four corners of the base plate 26.

In the joint structure 22 according to the above embodiment, more than four anchor bolts 8 may be embedded inside the foundation concrete 3, depending on the position and number of the bolt insertion holes 26a formed in the base plate 26.

In addition, in the joint structure 22 according to the above embodiment, the column member 25 is formed in a rectangular tube shape whose horizontal cross section is approximately square, but the column member 25 may be formed in a shape other than a rectangular tube shape, such as a cylindrical shape whose horizontal cross section is circular.

In addition, in the joint structure 22 according to the embodiment, as shown in FIG. 1, the brace 6 is provided on the left side of the column base in the figure, but the brace 6 may be provided on the right side of the column base in the figure, or on both the left and right sides of the column base.

In addition, in the joint structure 22 according to the above embodiment and the joint structure 29 shown in FIG. 7, the joint metal 24 is provided on the foundation concrete 3 or the foundation beam 13, but as long as it is made of concrete, the joint metal 24 can be provided on structures other than foundations and beams, and therefore the joint metal 24 may be used to fix the ends of column members or braces to such structures.

2 Joint structure 3 Foundation concrete 4 Joint metal 4a Bolt insertion hole 5 Column member 6 Brace 7 Gusset plate 8 Anchor bolt 9 Mortar layer 10 Nut 12 Joint structure 13 Foundation beam 14 Joint metal 16 Base plate 16a Bolt insertion hole 17 Gusset plate 18 Protrusion 19 Joint structure 20 Joint structure 22 Joint structure 24 Joint metal 25 Column member 25a Slit 26 Base plate 26a Bolt insertion hole 26b Through hole 26c First long hole portion 26d Second long hole portion 26e Tapered portion 28 Through member 28a First vertical plate portion 28b Second vertical plate portion 29 Joint structure W Welded portion

Claims (8)

A metal joint provided on a structure formed of concrete,
A plate-shaped base plate having a through hole formed on an upper surface thereof and penetrating in a thickness direction;
a penetrating member that is inserted into the through hole of the base plate and is integrally fixed to the base plate,
An end of a brace is fixed to a horizontal end of a portion of the penetrating member that protrudes from the upper surface of the base plate,
A metal joint, characterized in that a lower end of the portion of the penetrating member that protrudes from the underside of the base plate is positioned below the surface of the concrete and is configured to be embedded inside the concrete. The metal joint according to claim 1, wherein the horizontal cross-sectional shape of the penetrating member is formed to be substantially the same as the horizontal cross-sectional shape of the through hole. The metal joint according to claim 1 or 2, characterized in that the penetrating member has a horizontal cross-sectional shape that is substantially cross-shaped. A metal joint as described in any one of claims 1 to 3, characterized in that the openings of the through holes that open to both the upper and lower surfaces of the base plate are each formed with a tapered portion that gradually increases in size as the horizontal cross-sectional shape of the opening approaches both the upper and lower surfaces of the base plate. The metal joint according to any one of claims 1 to 4, characterized in that the penetrating member is integrally formed by casting or forging and fixed to the base plate by welding. The metal joint is provided at the lower end of a pillar member erected on a foundation formed of concrete,
The base plate is formed so that a planar shape thereof is larger than a horizontal cross-sectional shape of the pillar member, and a lower end portion of the pillar member is fixed to an upper surface of the base plate,
A metal joint as described in any one of claims 1 to 5, characterized in that the horizontal end of the portion of the penetrating member that protrudes from the upper surface of the base plate is formed so as to be positioned outside the outer surface of the column member. The metal joint according to any one of claims 1 to 5, characterized in that the metal joint is provided at a longitudinal midpoint of a beam made of concrete. A joint structure using a metal joint provided on a structure formed of concrete,
A plate-shaped base plate having a through hole formed on an upper surface thereof and penetrating in a thickness direction;
a penetrating member that is inserted into the through hole of the base plate and is integrally fixed to the base plate,
An end of a brace is fixed to a horizontal end of a portion of the penetrating member that protrudes from the upper surface of the base plate,
A joint structure characterized in that a lower end of the portion of the penetrating member that protrudes from the underside of the base plate is located below the surface of the concrete and a joint metal is used that is embedded inside the concrete.

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