JP2021173019A - Joint metal fitting - Google Patents

Abstract

To provide a joint metal fitting that has bearing force sufficient for efficient transmission of shearing force to a structure such as a foundation and a beam formed of concrete and enables weight saving of the joint metal fitting and reduction in costs.SOLUTION: A joint metal fitting 24 provided on a structure formed of concrete 3 comprises: a tabular base plate 26; and a protrusion part 28 that is integrally provided on the base plate 26 so as to protrude from an undersurface of the base plate 26. In the protrusion part 28 is formed a taper part 28c at which a horizontal thickness dimension of the protrusion part 28 gradually reduces as it goes toward a lower end of the protrusion part 28. The lower end of the protrusion part 28 is positioned below the concrete 3's front surface and embedded in the inside of the concrete 3.SELECTED DRAWING: Figure 1

Description

The present invention relates to a metal joint used to fix an end portion of a column member or a brace that constitutes a part of a building structure to a structure such as a foundation or a beam formed of concrete.

In building structures such as S structure and SRC structure, column members composed of square steel pipes, circular steel pipes, etc. are welded to the lower end of the column members in order to stand on the foundation formed of concrete. A joining structure has been known in which the upper end portion of an anchor bolt embedded in the foundation concrete is joined to the joining metal fitting (see, for example, FIG. 4 of Patent Document 1).

8 and 9 are views to be referred to for explaining the conventional joining metal fitting 4 and the joining structure 2 using the conventional joining metal fitting 4.

As shown in FIG. 8, the joint structure 2 is embedded inside the pillar member 5 erected on the foundation concrete 3, the joint metal fitting 4 provided at the lower end of the pillar member 5, and the foundation concrete 3. It was equipped with a plurality of anchor bolts 8.

As shown in FIG. 9, the conventional metal joint 4 has a predetermined thickness dimension and is formed in a plate shape having a substantially square planar shape, and the metal joint 4 is thickened in the vicinity of the four corners on the upper surface thereof. One bolt insertion hole 4a penetrating in the longitudinal direction was formed at each of the four corners.

The metal joint 4 is formed of a steel material having 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 such a column member 5 is attached to the lower surface of the metal joint 4. It was erected on the foundation concrete 3 via a mortar layer 6 provided between the surface of the foundation concrete 3 and the surface of the foundation concrete 3.

On the other hand, as shown in FIG. 8, a plurality of anchor bolts 8 are embedded inside the foundation concrete 3, and the upper ends of these anchor bolts 8 are formed in the metal joint 4 through the mortar layer 6. A nut 10 was fastened to the upper end threaded portion of the anchor bolt 8 which was inserted into the bolt insertion hole 4a and protruded upward from the upper surface of the metal joint 4.

According to such a joining metal fitting 4 and a joining structure 2 using the same, when an external force due to an earthquake or the like acts on the column base portion of the column member 5, the column member of the building structure tilts or falls. It was possible to prevent this.

That is, as shown in FIG. 8, when a bending moment M acts on the column base portion of the column member 5 due to an external force such as an earthquake, the tensile force T generated on the anchor bolt 8 on the left side in the drawing and the joint metal fitting 4 Due to the compressive force C from the foundation concrete 3 generated via the mortar layer 6 on the right side of the lower surface of the figure, a bending moment that resists the bending moment M acts on the column base portion of the column member 5. ..

However, in the joint structure 2 using such a conventional joint metal fitting 4, the force acting on the column base of the column member 5 in the shear direction (left-right direction in FIG. 8 or direction perpendicular to the paper surface in the figure) is an anchor bolt. There was a risk of concentrating on 8.

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

10 and 11 are diagrams referred to for explaining another conventional joining metal fitting 14 used for such a joining structure, and another joining structure 12 using the same.

The joining structure 12 is different from the joining structure 2 in that the joining metal 14 as shown in FIG. 11 is provided instead of the conventional joining metal 4 in the joining structure 2 shown in FIG. there were.

As shown in FIG. 11, the conventional metal joint 14 includes a base plate 16 having a predetermined thickness dimension and formed in a plate shape having a substantially square planar shape, and in the vicinity of the four corners on the upper surface thereof, A bolt insertion hole 16a penetrating the base plate 16 in the thickness direction was formed at each of the four corners.

Then, on the lower surface of the base plate 16 of the metal joint 14, as shown in FIG. 11A, a protruding portion 18 having a substantially cross-shaped horizontal cross-sectional shape is formed on the base plate 16 as shown in FIG. 11B. It was provided so as to project downward from the lower surface of 16.

Then, as shown in FIG. 10, the metal joint 14 is fixed to the lower end of the pillar member 5 by welding or the like, and such a pillar member 5 is placed between the lower surface of the base plate 16 and the surface of the foundation concrete 3. It was erected on the foundation concrete 3 via the provided mortar layer 6.

At this time, the protruding portion 18 provided on the lower surface of the base plate 16 of the metal joint 14 is inside the foundation concrete 3 so that the lower end portion thereof is located below the surface of the foundation concrete 3, as shown in FIG. It was supposed to be buried in.

Since other configurations are the same as those of the conventional joining metal fitting 4 and the joining structure 2 using the same, even the joining metal fitting 14 having such a form and the joining structure 12 using the joining structure 12 have a building structure. When an external force such as an earthquake acts on the column base of an object, it has become possible to prevent the column members of the building structure from tilting or tipping over.

Then, according to the joining metal fitting 14 and the joining structure 12 using the joining metal fitting 14, the shearing direction (horizontal direction) force acting on the column base portion of the column member 5 is prevented from being concentrated on the anchor bolt 8. , The shearing force acting on the column base of the column member 5 can be efficiently transmitted to the foundation concrete 3.

That is, as shown in FIG. 10, a shearing force F acting on the column base portion of the column member 5 due to an external force such as an earthquake is applied to each side surface of the protruding portion 18 of the joint metal fitting 14 embedded inside the foundation concrete 3. I was able to make it.

On the other hand, in a building structure such as an S structure or an SRC structure, in order to improve the strength of the building structure, a reinforcing member called a brace that diagonally connects the column member and the beam member may be provided (for example). (See Patent Document 2), a metal joint having the same structure as the metal joints 2 and 12 as shown in FIGS. 9 and 11 is provided at the end of such a brace in the middle of the length of a beam formed of concrete. Sometimes used to fix.

That is, as shown in FIGS. 12 (a) and 12 (b), similar to the joint structures 2 and 12 shown in FIGS. 8 and 10, the joint metal fittings 4 and 14 are placed in the middle of the length of the foundation beam 13. It is arranged via the layer 6 and fixed by using anchor bolts 8 and nuts 10, and has a predetermined thickness on the upper surface of the metal joint 4 and the upper surface of the base plate 16 of the metal joint 14 in the direction perpendicular to the paper surface of the drawing. Joining structures 19 and 20 are used in which the plate-shaped gusset plate 7 is fixed by welding or the like, and the ends of the two braces 9 are connected to the gusset plate 7 and fixed by bolts or the like. Was there.

Japanese Unexamined Patent Publication No. 2000-319990 Japanese Unexamined Patent Publication No. 62-101737

However, the joining structures 12 and 20 using the conventional joining metal fitting 14 as described above improve the proof stress of the joining metal fitting 14 against the shearing force and bending moment acting on the column base portion of the column member 5 and the end portion of the brace 9. There is a problem that the protruding portion 18 of the metal joint 14 becomes large and the weight of the metal joint 14 increases when trying to make the metal joint 14.

That is, in the joint structure 12 using the conventional joint metal fitting 14, as shown in FIG. 10, the shearing force F acting on the column base portion of the column member 5 is applied to each side surface of the protruding portion 18 of the joint metal fitting 14. As shown in FIG. 13, the tensile force T generated in the anchor bolt 8 on the left side in the drawing and the lower surface of the base plate 16 with respect to the bending moment M acting on the column base of the column member 5 On the right side of the figure, a bending moment that resists the bending moment M due to the compressive force C generated from the foundation concrete 3 via the mortar layer 6 and the reaction force f generated on each side surface of the projecting portion 18 is the column of the column member 5. It was supposed to act on the legs.

The bending moment M0 acting by the reaction force f generated on each side surface of the protruding portion 18 of the metal joint 14 is larger at the upper end than at the lower end of the protruding portion 18, so that the protruding portion 18 and the base plate 16 The largest load was applied at the joint.

Therefore, when an attempt is made to improve the yield strength of the metal joint on the assumption that a larger shearing force or bending moment acts on the column base, the protruding portion 18 does not yield due to such a reaction force or bending moment. It was necessary to increase the thickness dimension of the plate member constituting the projecting portion 18 and to weld the joint portion between the projecting portion 18 and the base plate 16 more firmly.

When the plate thickness of the protruding portion 18 is increased, the weight of the metal joint 14 is increased by that amount, so that the amount of material (steel material) used for the metal joint 14 is increased and the metal joint 14 is welded to the column member 5. Since the handling of the metal joint 14 at the time of fixing is deteriorated, there is a possibility that the manufacturing cost of the metal joint 14 and the construction cost of the metal joint 12 may increase.

Therefore, in view of the above problems, the present invention has sufficient proof stress for efficiently transmitting the shearing force to a structure such as a foundation or a beam formed of concrete, and reduces the weight of the metal joint. An object of the present invention is to provide a metal joint that can reduce the cost.

The metal joint according to the present invention is used to solve the above problems.
It is a metal joint provided on a structure formed of concrete.
Plate-shaped base plate and
A protrusion provided integrally with the base plate so as to project from the lower surface of the base plate is provided.
The protrusion is formed with a detail such that the horizontal thickness dimension of the protrusion gradually decreases toward the lower end of the protrusion.
The lower end of the protruding portion is located below the surface of the concrete and is configured to be embedded inside the concrete.

Further, the metal joint according to the present invention is
The joining metal fitting according to claim 1, wherein the protruding portion is formed in a substantially cross shape in its planar shape.

Further, the metal joint according to the present invention is
The tip of the protrusion is such that the cross-sectional shape of both side surfaces in the thickness direction is such that the inclination angle of the tangent line at an arbitrary point on the side surface with respect to the horizontal direction is from the upper end to the lower end of the tip. It is characterized by being formed in an arc shape that gradually increases.

Further, the metal joint according to the present invention is
The detail of the protruding portion is characterized in that the cross-sectional shape of both side surfaces in the thickness direction is formed in a substantially linear shape.

Further, the metal joint according to the present invention is
The detail of the protruding portion is such that the cross-sectional shape of both side surfaces in the thickness direction is formed in a stepped shape such that a plurality of stepped portions are provided along the side surface in the middle of the height. It is characterized by.

Further, 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 its planar shape is larger than the horizontal cross-sectional shape of the pillar member, and the lower end portion of the pillar member is fixed to the upper surface of the base plate.

Further, the metal joint according to the present invention is
The metal joint is provided in the middle of the length of the beam formed of concrete.
The feature is that the end of the brace is fixed to the gusset plate provided on the upper surface of the base plate.

According to such a metal joint of the present invention,
It is a metal joint provided on a structure formed of concrete.
Plate-shaped base plate and
A protrusion provided integrally with the base plate so as to project from the lower surface of the base plate is provided.
The protrusion is formed with a detail such that the horizontal thickness dimension of the protrusion gradually decreases toward the lower end of the protrusion.
The lower end of the protruding portion is located below the surface of the concrete and is configured to be embedded inside the concrete.
It has sufficient yield strength to efficiently transfer the shearing force to structures such as foundations and beams formed of concrete, and can reduce the weight of the metal joints and reduce costs.

It is a schematic side view which shows the joint structure 22 of the column base part using the joint metal fitting 24 which concerns on 1st Embodiment of this invention. 2A and 2B are perspective views from the upper surface side thereof, and FIG. 2B is a perspective view from the lower surface side thereof. FIG. 3A is a plan view of the metal joint 24, and FIG. 3B is a bottom view thereof. FIG. 4A is a side view thereof, FIG. 4B is a sectional view taken along the line AA in FIG. 3A, and FIG. 4C is a view showing the metal joint 24. Is a cross-sectional view taken along the line BB in FIG. 3 (a). It is a figure which shows the joining metal fitting 34 which concerns on the 2nd Embodiment of this invention, FIG. 5A is a perspective view from the lower surface side thereof, and FIG. 5 (c) is a cross-sectional view taken along the line CC in FIG. 5 (a). It is a figure which shows the joining metal fitting 44 which concerns on 3rd Embodiment of this invention, FIG. 6A is a perspective view from the lower surface side thereof, and FIG. 6B is a side view thereof. 6 (c) is a cross-sectional view taken along the line DD in FIG. 6 (a). It is a schematic side view which shows the joint structure 29 of a brace 9 and a foundation beam 13 using a joint metal fitting 24. It is a schematic side view which shows the joint structure 2 of the column base part using the conventional joint metal fitting 4. 9A is a plan view of the metal joint 4 shown in FIG. 8, and FIG. 9B is a side view thereof. It is a schematic side view which shows the joining structure 12 of the column base part using the conventional joining metal fitting 14. 10 is a view showing the metal joint 14 shown in FIG. 10, FIG. 11A is a plan view thereof, and FIG. 11B is a side view thereof. FIG. 12 (a) is a schematic side view showing the joint structure 19 of the brace 9 and the foundation beam 13 using the conventional joint metal fitting 4, and FIG. 12 (b) is the brace 9 and the foundation using the conventional joint metal fitting 14. It is a schematic side view which shows the joint structure 20 of a beam 13. It is a figure for demonstrating the force and bending moment acting on the column base part of the joint structure 12 using the conventional joint metal fitting 14, and the periphery of the lower end part of the column member 5 of the joint structure 12 shown in FIG. 10 is enlarged. It is a schematic side view.

Hereinafter, a mode for carrying out the metal joint according to the present invention will be specifically described with reference to the drawings. It should be noted that the same parts as those of the conventional metal joints 4 and 14 shown in FIGS. 8 to 13 shall be described with the same reference numerals except for a part.

1 to 4 are diagrams referred to for explaining the joining metal fitting 24 according to the first embodiment of the present invention.

As shown in FIG. 1, the joint structure 22 is embedded inside the pillar member 25 erected on the foundation concrete 3, the joint metal fitting 24 provided at the lower end of the pillar member 25, and the foundation concrete 3. It is provided with a plurality of anchor bolts 8.

The column member 25 is a square steel pipe formed in a square tubular shape having a substantially square horizontal cross-sectional shape, and is erected on the foundation concrete 3 so as to extend in the vertical direction in the drawing as shown in FIG. , The joining metal fitting 24 is integrally fixed to the lower end portion thereof.

As shown in FIG. 2, the metal joint 24 includes a plate-shaped base plate 26 and a protruding portion 28 provided so as to project downward from substantially the center of the lower surface of the base plate 26.

As shown in FIGS. 3A and 3B, the base plate 26 of the metal joint 24 has a predetermined thickness dimension in the direction perpendicular to the paper surface of the drawing, and is formed into a plate shape having a substantially square plane shape. In the vicinity of the four corners of the upper surface, two bolt insertion holes 26a penetrating the base plate 26 in the thickness direction are formed at each of the four corners.

As shown in FIG. 4A, the protruding portion 28 of the metal joint 24 has a predetermined height in the vertical direction in the drawing, and the horizontal cross-sectional shape is substantially cross-shaped (see FIGS. 3A and 3B). ) Is formed.

Then, as shown in FIGS. 4A and 4C, the horizontal direction (left and right in the figure) of the plate-shaped portion constituting the substantially cross-shaped protruding portion 28 from the middle portion to the lower end portion of the height of the protruding portion 28. The tip 28c is formed so that the thickness dimension in the direction) gradually decreases toward the lower end of the protrusion 28.

That is, as shown in FIG. 3B, the projecting portion 28 has a predetermined thickness in the vertical direction in the figure and a predetermined width in the horizontal direction in the figure, and the first vertical plate portion 28a in the drawing. It seems that the second vertical plate portions 28b having a predetermined thickness in the left-right direction and a predetermined width in the vertical direction in the drawing intersect at substantially right angles at the central portions in the respective width directions and are integrally connected. Is formed in.

Then, as shown in FIGS. 4A and 4C, the tip 28c of the protruding portion 28 extends from the middle portion to the lower end portion of the heights of the first vertical plate portion 28a and the second vertical plate portion 28b, respectively. The thickness dimensions of the first vertical plate portion 28a and the second vertical plate portion 28b are formed so as to gradually decrease toward the lower ends of the first vertical plate portion 28a and the second vertical plate portion 28b, respectively. ..

Then, as shown in FIG. 4 (c), the detailed 28c has a cross-sectional shape of both end surfaces of the protruding portion 28 in the thickness direction (left-right direction in the figure) of the tangent line at an arbitrary point on the side surface. The inclination angle with respect to the horizontal direction (left-right direction in the figure) is formed in an arc shape so as to gradually increase from the upper end portion to the lower end portion of the projecting portion 28.

As shown in FIG. 4A, such a protruding portion 28 has an upper end portion integrally coupled to substantially the center of the lower surface of the base plate 26, and the protruding portion 28 extending downward from the upper end portion of the protruding portion 28. The height portion is formed so as to project downward from the lower surface of the base plate 26.

In such a joining member 24, the base plate 26 and the protruding portion 28 can be formed of a steel material having sufficient strength. For example, the protruding portion 28 created by casting or forging is welded to the lower surface of the base plate 26 by welding or the like. It can be formed by fixing. It can also be formed by integrally molding the base plate 26 and the protruding portion 28 by casting or forging.

As shown in FIG. 1, such a metal joint 24 is arranged at the lower end of the pillar member 25 so that the lower end surface of the pillar member 25 abuts on the upper surface of the base plate 26 of the metal joint 24.

At this time, as shown in FIG. 1, the base plate 26 of the metal joint 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 of the column member 25. It is formed so as to be located outside the outer surface of the lower end portion of the.

The joint metal fitting 24 is integrated with the lower end portion of the pillar member 25 by welding the lower end portion of the column member 25 and the upper surface of the base plate 26 of the joint metal fitting 24 along the peripheral portion of the lower end portion of the pillar member 25. It is fixed to.

Then, as shown in FIG. 1, the pillar member 25 in which the metal joint 24 is fixed to the lower end thereof is connected to the foundation concrete via the mortar layer 6 provided between the metal joint 24 and the foundation concrete 3. It is erected on No. 3 so as to extend in the vertical direction in the figure.

At this time, the protruding portion 28 of the metal joint 24 is embedded in the foundation concrete 3 with its lower end located below the surface of the foundation concrete 3.

On the other hand, as shown in FIG. 1, a plurality of anchor bolts 8 extend inside the foundation concrete 3 in the vertical direction in the drawing, and the upper end thereof is the foundation concrete 3. It is buried so as to protrude above the surface of the concrete.

The upper ends of these anchor bolts 8 penetrate the mortar layer 6 in the vertical direction in the drawing, and are loosely inserted into the bolt insertion holes 26a formed in the base plate 26 of the metal joint 24 from below. A nut 10 is fastened to the upper end threaded portion of the anchor bolt 8 projecting upward from the upper surface.

According to the joining metal fitting 24 according to the present embodiment, the protruding portion 28 of the joining metal fitting 24 can be used as a shear cotter for efficiently transmitting the shearing force acting on the column base portion to the foundation concrete. Therefore, the shearing force acting on the column base of the building structure can be efficiently transmitted to the foundation concrete.

Further, according to the metal joint 24 according to the present embodiment, the protrusion 28 can be miniaturized to reduce the weight of the metal joint 24.

That is, in the joining structure 22 using the joining metal fitting 24 according to the present embodiment, the bending moment is applied to the column base portion of the pillar member 25 as in the joining structure 12 using the conventional joining metal fitting 14 shown in FIG. The bending moment acting by the reaction force generated on each side surface of the protruding portion 28 of the metal joint 24 so as to resist the action is larger at the upper end portion than at the lower end portion of the protruding portion 28. , The largest load is applied at the joint between the protrusion 28 and the base plate 26.

Further, in the metal joint 24 according to the present embodiment, since the thickness dimension of the upper end portion of the protruding portion 28 having a large load is larger than that of the lower end portion, the proof stress of the metal joint 24 can be improved. Since the thickness dimension of the lower end portion of the protruding portion 28 having a small load is smaller than that of the upper end portion, the protruding portion 28 can be reduced in size and the weight of the metal joint 24 can be reduced accordingly.

Then, by reducing the size of the protruding portion 28 and reducing the weight of the metal joint 24, the amount of material used for the metal joint 24 can be reduced, and the metal joint 24 is welded and fixed to the pillar member 25. Since the maneuverability at the time of performing is also improved, it is possible to reduce the manufacturing cost of the metal joint 24 and the construction cost of the joint structure 22.

As described above, according to the metal joint 24 according to the present embodiment, the metal joint has sufficient proof stress for efficiently transmitting the shearing force to a structure such as a foundation or a beam formed of concrete, and the metal joint. The weight can be reduced and the cost can be reduced.

FIG. 5 is a diagram referred to for explaining the joining metal fitting 34 according to the second embodiment of the present invention.

The joining metal fitting 34 according to the present embodiment is provided with a protruding portion 38 as shown in FIG. 5 in place of the protruding portion 28 provided in the joining metal fitting 24 according to the first embodiment. The structure is different from that of the metal joint 24 according to the first embodiment.

As shown in FIG. 5A, the protruding portion 38 of the metal joint 34 is the first vertical plate 38a and the second vertical plate, similarly to the project 28 in the metal joint 24 according to the first embodiment. A portion 38b is provided, and a tip detail 38c is formed from the middle portion to the lower end portion of the height of each of the first vertical plate portion 38a and the second vertical plate portion 38b.

Then, as shown in FIG. 5 (c), the tip 38c of the protruding portion 38 is formed so that the cross-sectional shapes of both end surfaces in the thickness direction (left-right direction in the figure) are substantially linear. Similar to the detail 28c in the protrusion 28 of the joint metal fitting 24 according to the first embodiment, the thickness dimension of the first vertical plate portion 38a and the second vertical plate portion 38b constituting the protrusion 38 is the lower end. It is formed so that it gradually becomes smaller toward the part.

Other configurations are the same as those of the metal joint 24 according to the first embodiment, and even with such a metal joint 34, the shear force is efficiently applied to a structure such as a foundation or a beam formed of concrete. It has sufficient yield strength for transmission, and can reduce the weight of the metal joint and reduce the cost.

FIG. 6 is a diagram referred to for explaining the joining metal fitting 44 according to the third embodiment of the present invention.

The joining metal fitting 44 according to the present embodiment is provided with a protruding portion 48 as shown in FIG. 6 in place of the protruding portion 28 provided in the joining metal fitting 24 according to the first embodiment. The structure is different from that of the metal joint 24 according to the first embodiment.

As shown in FIG. 6A, the protruding portion 48 of the metal joint 44 is the first vertical plate 48a and the second vertical plate, similarly to the project 28 in the metal joint 24 according to the first embodiment. The portion 48b is provided, and the tip detail 48c is formed from the middle portion to the lower end portion of the height of each of the first vertical plate portion 48a and the second vertical plate portion 48b.

Then, as shown in FIG. 6 (c), the tip details 48c of the protruding portion 48 have the cross-sectional shapes of both end surfaces in the thickness direction (left-right direction in the figure) in the middle of the height along the side surfaces. The portion is formed in a stepped shape as if a plurality of step portions are provided, whereby the protrusion 38 is formed in the same way as the tip 28c in the protrusion 28 of the joint metal fitting 24 according to the first embodiment. The thickness dimensions of the first vertical plate portion 38a and the second vertical plate portion 38b that constitute the structure are formed so as to gradually decrease toward the lower end portion.

Other configurations are the same as those of the metal joint 24 according to the first embodiment, and even with such a metal joint 44, the shearing force is efficiently applied to a structure such as a foundation or a beam formed of concrete. It has sufficient yield strength for transmission, and can reduce the weight of the metal joint and reduce the cost.

The present invention is not limited to the above-described embodiment, and various modifications can be made as long as the object of the present invention can be achieved.

For example, in the joining structure 22 using the joining metal fitting 24 according to the first embodiment, as shown in FIG. 1, the joining metal fitting 24 is the lower end of the pillar member 25 erected on the foundation concrete 3. Although it was provided in the portion, the joining metal fittings 24 (or the joining metal fittings 34 and 44 according to the second and third embodiments) were formed of concrete in the same manner as the joining structures 19 and 20 shown in FIG. It may be used to fix the end of the brace in the middle of the length of the beam.

That is, as shown in FIG. 7, the metal joint 24 is arranged in the middle of the length of the foundation beam 13 so that the lower end of the protruding portion 28 is embedded inside the foundation beam 13 via the mortar layer 6. , Anchor bolts 8 and nuts 10 are used to fix, and the gusset plate 7 is fixed to the upper surface of the base plate 26 by welding or the like, and the ends of the two braces 9 are connected to the gusset plate 7 and fixed by bolts or the like. You may use the bonding structure 29 as described above.

Further, in the metal joints 24, 34, 44 according to the first to third embodiments, the plane shape of the base plate 26 is formed to be substantially square, but the plane shape of the base plate 26 is a regular octagon or the like. It may be formed in a shape other than a square such as a circle.

Further, in the metal joints 24, 34, 44 according to the first to third embodiments, the upper surface and the lower surface of the base plate 26 are all formed flat, but these portions do not have to be flat. For example, ribs for improving the strength of the base plate 26 may be formed on the upper surface of the base plate 26, or an uneven shape for improving the adhesive force with the mortar layer 6 may be formed on the lower surface of the base plate 26. ..

Further, in the metal joints 24, 34, 44 according to the first to third embodiments, the base plate 26 is formed with two bolt insertion holes 26a at each of the four corners, for a total of eight bolt insertion holes 26a. However, the number of bolt insertion holes 26a formed in the base plate 26 may be less than eight or more, and even if the bolt insertion holes 26a are formed at positions other than the four corners of the base plate 26. good.

Further, in the joining metal fittings 24, 34, 44 according to the first to third embodiments, the projecting portions 28, 38, 48 are formed in a substantially cross-shaped plane shape, but the projecting portions 28. , 38, 48 may be formed in a shape other than the cross shape, for example, a shape in which the planar shape extends radially from the center in all directions, a cylindrical shape, a square cylinder shape, or the like.

Further, in the metal joints 24, 34, 44 according to the first to third embodiments, one protrusion 28, 38, 48 is provided on the lower surface of the base plate 26, but the lower surface of the base plate 26 is provided. May be provided with two or more protrusions 28, 38, 48.

Further, in the metal joints 24, 34, 44 according to the first to third embodiments, the protrusions 28, 38, and 48 have arcuate, linear, and stepped step details 28c, 38c, and 48c, respectively. However, the detail may be formed in any shape as long as the thickness dimension of the protruding portion becomes smaller from the upper end portion to the lower end portion.

Further, in the joint structure 22 using the joint metal fitting 24 and the joint structure 29 shown in FIG. 6, the joint metal fitting 24 is provided on the foundation concrete 3 and the foundation beam 13, although the joint metal fitting 24 is provided on the foundation concrete 3 and the foundation beam 13. If the metal joint 24 (or metal joint 34,44) is formed of concrete, it can be provided on a structure other than a foundation or a beam. Therefore, the metal joint 24, 34, 44 is formed of such concrete. It may be used to fix the end of a pillar member or brace to a structure other than a concrete foundation or beam.

2 Joint structure 3 Foundation concrete 4 Joint metal fittings 4a Bolt insertion hole 5 Pillar member 6 Mortal layer 7 Gusset plate 8 Anchor bolt 9 Brace 10 Nut 12 Joint structure 13 Foundation beam 14 Joint metal fitting 16 Base plate 16a Bolt insertion hole 18 Protruding part 19 Joint structure 20 Joining structure 22 Joining structure 24 Joining hardware 25 Pillar member 26 Base plate 26a Bolt insertion hole 28 Protruding part 28a First vertical plate part 28b Second vertical plate part 28c Tip details 29 Joining structure 34 Joining hardware 38 Protruding part 38a First vertical plate Part 38b Second vertical plate 38c Tip detail 44 Joint hardware 48 Protruding part 48a First vertical plate part 48b Second vertical plate part 48c Tip detail M, M0 Bending moment T Tensile force C Compressive force F Shearing force f Reaction force

Claims (7)

It is a metal joint provided on a structure formed of concrete.
Plate-shaped base plate and
A protrusion provided integrally with the base plate so as to project from the lower surface of the base plate is provided.
The protrusion is formed with a detail such that the horizontal thickness dimension of the protrusion gradually decreases toward the lower end of the protrusion.
A metal joint characterized in that the lower end portion of the protruding portion is located below the surface of the concrete and is embedded in the concrete. The joining metal fitting according to claim 1, wherein the protruding portion is formed in a substantially cross shape in its planar shape. The tip of the protrusion is such that the cross-sectional shape of both side surfaces in the thickness direction is such that the inclination angle of the tangent line at an arbitrary point on the side surface with respect to the horizontal direction is from the upper end to the lower end of the tip. The metal joint according to claim 1 or 2, wherein the metal joint is formed in an arc shape so as to gradually increase in size. The joining metal fitting according to claim 1 or 2, wherein the details of the protruding portion are formed so that the cross-sectional shapes of both side surfaces in the thickness direction are formed substantially linearly. The detail of the protruding portion is such that the cross-sectional shape of both side surfaces in the thickness direction is formed in a stepped shape such that a plurality of stepped portions are provided along the side surface in the middle of the height. The joining metal fitting according to claim 1 or 2. The metal joint is provided at the lower end of a pillar member erected on a foundation formed of concrete.
Claims 1 to 5 are characterized in that the base plate is formed so that its planar shape is larger than the horizontal cross-sectional shape of the pillar member, and the lower end portion of the pillar member is fixed to the upper surface of the base plate. Joining hardware described in any of. The metal joint is provided in the middle of the length of the beam formed of concrete.
The joining metal fitting according to any one of claims 1 to 5, wherein the end portion of the brace is fixed to a gusset plate provided on the upper surface of the base plate.

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