Patent Application
20220307255
The present invention relates to a joint metal used when a horizontal structural member is joined to a support material and to a building structure when a support material and a horizontal structural member are joined together using the joint metal.
Conventionally, in a wooden building, as a method for joining a wood such as a pillar and a wood such as a beam, joint metals in various shapes are used for the purposes of streamlining construction, ensuring resistance of a joint portion, and similar purpose.
As this joint metal, for example, there is a joint metal constituted in a U shape by a front plate and a pair of side plates (for example, see Patent Document 1). The front plate is secured in contact with the side surface of the pillar. The side plates project toward the beam side by folding both ends of the front plate. In this joint metal, a plurality of front holes for inserting bolts through the front plate is formed to be arranged in the up-down direction. The front plate is fastened with nuts in a state where the bolts inserted through these front holes have passed through the pillar, so as to be secured to the side surface of the pillar. Additionally, on the side plate, a plurality of pinholes is formed to be arranged in the up-down direction. In a state where the side plate has been inserted into grooves formed on the end surface of the beam, the drift pin is driven from the side hole formed on the side surface of the beam so as to couple the side plate to the beam.
However, in this joint metal, in the case where an excessive load acts on the joint portion, cracking occurs in the beam before the metal deforms. Finally, the beam fractures and then the joint portion is broken. Here, the woods have individual differences in strength due to a factor such as a water content rate. Accordingly, in the case where this joint metal is used, variation in yield resistance or similar parameter becomes large due to the fracture of the wood as a determination factor of the yield point. Therefore, a plurality of deficient portions, which is widely opened in up, down, right, and left directions, is formed in a region other than the pinholes formed on the side plate. Accordingly, when an excessive load acts on the beam, the side plate elastically deforms. The energy is absorbed by this elastic deformation so as to reduce the local load acting on the beam. This slows occurrence of cracking in the beam. This joint metal has been disclosed (for example, see Patent Document 2).
However, in the joint metal of Patent Document 2, since the region of the deficient portion formed on the side plate occupies the large part of the side plate, the rigidity of the entire metal is decreased. Accordingly, when a load acts on the joint portion, an elastic deformation occurs at an unnecessarily early stage. Thus, the value of the yield resistance decreases so as to reduce the variation in fracture behavior of the beam. However, a high strength performance cannot be always obtained as the entire joint portion. As illustrated in
The present invention has been made in view of the above-described problems, and it is an object of the present invention to provide a joint metal and a building structure that do not ruin yield resistance, initial rigidity, energy absorbing ability, and similar property of a joint portion between a support material such as a pillar and a horizontal structural member such as a beam when an excessive load acts on the joint portion and that are excellent in stability of strength as the joint portion and have high reliability. Additionally, it is an object of the present invention to provide a joint metal and a building structure that suppress falling over of a coupling plate disposed to project from a securing plate to a horizontal structural member side when the securing plate secured to a side surface of a support material is fastened with a bolt.
To achieve the above-described objects, a first joint metal according to the present invention is a joint metal for joining an end surface of a horizontal structural member to a side surface of a support material. The joint metal includes a securing plate and a coupling plate. The securing plate is to be secured to the side surface of the support material. The coupling plate is disposed to project from the securing plate toward the horizontal structural member side. The coupling plate is to be coupled in a state inserted into a groove formed over a vertical direction on the end surface of the horizontal structural member. The coupling plate includes a coupling hole and a first deficient portion. The coupling hole allows insertion of a rod-shaped coupling tool within the groove. The coupling tool is to pass through the horizontal structural member. The first deficient portion is formed by cutting out a peripheral area of the coupling hole. The first deficient portion is formed in an arc shape centered at the coupling hole.
In a second joint metal according to the present invention, the first deficient portion is formed in an arc shape centered at the coupling hole with a constant diameter.
In a third joint metal according to the present invention, a plurality of the first deficient portions are formed in arc shapes centered at the coupling holes with a same diameter. One of portions between end portions of the first deficient portions adjacent to one another in a circumferential direction is disposed to be positioned on a horizontal straight line passing through a center of the coupling hole and on a distal end side of the coupling plate with respect to the coupling hole in a horizontal direction.
In a fourth joint metal according to the present invention, the first deficient portion is formed symmetrically to a horizontal straight line passing through a center of the coupling hole.
A fifth joint metal according to the present invention is a joint metal for joining an end surface of a horizontal structural member to a side surface of a support material. The joint metal includes a securing plate and a coupling plate. The securing plate is to be secured to the side surface of the support material. The coupling plate is disposed to project from the securing plate toward the horizontal structural member side. The coupling plate is to be coupled in a state inserted into a groove formed over a vertical direction on the end surface of the horizontal structural member. The coupling plate includes a plurality of coupling holes and a second deficient portion. The coupling holes allow insertion of rod-shaped coupling tools within the groove. The coupling tools are to pass through the horizontal structural member. The second deficient portion is along a vertical straight line that passes through a center of the coupling hole. The second deficient portion is formed to be long in a vertical direction between the adjacent coupling holes.
A sixth joint metal according to the present invention is a joint metal for joining an end surface of a horizontal structural member to a side surface of a support material. The joint metal includes a securing plate and a coupling plate. The securing plate is to be secured to the side surface of the support material. The coupling plate is disposed to project from the securing plate toward the horizontal structural member side. The coupling plate is to be coupled in a state inserted into a groove formed over a vertical direction on the end surface of the horizontal structural member. The coupling plate includes a plurality of coupling holes, a third deficient portion, and a fourth deficient portion. The coupling holes allow insertion of rod-shaped coupling tools within the groove. The coupling tools are to pass through the horizontal structural member. The third deficient portion is cut out in a peripheral area of the coupling hole. The fourth deficient portion is along a vertical straight line that passes through the coupling hole. The third deficient portion is formed in an arc shape centered at the coupling hole. The fourth deficient portion is formed to be long in a vertical direction between the adjacent coupling holes.
In a seventh joint metal according to the present invention, the third deficient portion is formed in an arc shape with a constant diameter centered at the coupling hole.
In an eighth joint metal according to the present invention, a plurality of the third deficient portions are formed in arc shapes centered at the coupling holes with a same diameter. One of portions between end portions of the first deficient portions adjacent to one another in a circumferential direction is disposed to be positioned on a horizontal straight line passing through a center of the coupling hole and on a distal end side of the coupling plate with respect to the coupling hole in a horizontal direction.
In a ninth joint metal according to the present invention, the third deficient portion is formed symmetrically to a horizontal straight line passing through a center of the coupling hole.
In a tenth joint metal according to the present invention, the coupling plate includes a pin groove and a fifth deficient portion and/or a sixth deficient portion. The pin groove is formed on an upper end of the coupling plate. The fifth deficient portion is formed by cutting out in an arc shape in a peripheral area of the pin groove. The sixth deficient portion is formed by cutting out to be long in a vertical direction between the pin groove and the coupling hole adjacent to the pin groove.
An eleventh joint metal according to the present invention is a joint metal for joining an end surface of a horizontal structural member to a side surface of a support material. The joint metal includes a securing plate and a coupling plate. The securing plate is to be secured to the side surface of the support material. The coupling plate is disposed to project from the securing plate toward the horizontal structural member side. The coupling plate is to be coupled in a state inserted into a groove formed over a vertical direction on the end surface of the horizontal structural member. The coupling plate includes a coupling hole and a seventh deficient portion. The coupling hole allows insertion of a rod-shaped coupling tool within the groove. The coupling tool is to pass through the horizontal structural member. The seventh deficient portion is in communication with the coupling hole. The seventh deficient portion is formed to be long along a horizontal straight line.
In a twelfth joint metal according to the present invention, the seventh deficient portion has a vertical width smaller than a diameter of the coupling hole.
In a thirteenth joint metal according to the present invention, the securing plate includes a plurality of fixing holes for inserting fixtures. The fixing holes are formed to be aligned in a vertical direction. A securing-plate reinforcing bead is disposed. The securing-plate reinforcing bead projects from a back-side portion of the securing plate in contact with the side surface of the support material toward a projection direction of the coupling plate.
In a fourteenth joint metal according to the present invention, the securing-plate reinforcing bead is formed in a shape where a plurality of arcs communicate with one another in a vertical direction centered at the fixing holes so as to surround peripheral areas of the fixing holes.
In a fifteenth joint metal according to the present invention, a reinforcing rib is disposed on a bended portion at a boundary between the securing plate and the coupling plate.
In a sixteenth joint metal according to the present invention, the securing plate includes a plurality of fixing holes for inserting fixtures. The fixing holes are formed to be aligned in a vertical direction. A reinforcing rib is disposed on a bended portion at a boundary between the securing plate and the coupling plate.
In a seventeenth joint metal according to the present invention, the reinforcing rib is disposed in each portion between the fixing holes adjacent to one another in the vertical direction.
In an eighteenth joint metal according to the present invention, the securing plate includes a plurality of fixing holes for inserting fixtures. The fixing holes are formed to be aligned in a vertical direction. A bended-portion reinforcing bead is disposed in communication with the securing plate from the coupling plate through a bended portion at a boundary between the securing plate and the coupling plate.
In a nineteenth joint metal according to the present invention, end-portion reinforcing beads are disposed on both end portions in a width direction of the securing plate. The end-portion reinforcing bead is long in a vertical direction and projects from a back-side portion of the securing plate in contact with the side surface of the support material toward a projection direction of the coupling plate.
A building structure according to the present invention includes any one of the first to nineteenth joint metals. The joint metal joins the support material and the horizontal structural member together.
According to the first joint metal, the first deficient portion in an arc shape centered at the coupling hole is formed in the peripheral area of the coupling hole through which the rod-shaped coupling tool, which passes through the horizontal structural member, is inserted within the groove formed over the vertical direction on the end surface of the horizontal structural member. When an excessive load acts on the joint portion between the support material and the horizontal structural member, locally deforming the peripheral area of the coupling hole allows reducing the fracture of the horizontal structural member and allows controlling the deformation of the entire joint metal so as to reduce the variation in resistance of the joint portion. Additionally, this does not ruin the rigidity of the region other than the peripheral area of the coupling hole, thus maintaining relatively high yield resistance so as to improve a proof stress evaluation value.
According to the second joint metal, the first deficient portion in the arc shape centered at the coupling hole with the constant diameter is formed. This allows more efficiently causing local deformation of the peripheral area of the coupling hole when an excessive load acts on the joint portion between the support material and the horizontal structural member.
According to the third joint metal, the plurality of the first deficient portions are formed in arc shapes centered at the coupling hole with the same diameter. One of the portions between the end portions of the first deficient portions adjacent to one another in the circumferential direction is disposed to be positioned on the horizontal straight line passing through the center of the coupling hole and on the distal end side of the coupling plate with respect to the coupling hole in the horizontal direction. This allows improving the resistance against a tension load that acts on the horizontal structural member toward the horizontal direction side of the coupling plate.
According to the fourth joint metal, the first deficient portion is formed symmetrically to the horizontal straight line passing through the center of the coupling hole. Therefore, in either case where an excessive load acts on the horizontal structural member upward or downward in the vertical direction, the peripheral area of the coupling hole efficiently deforms. This allows reducing the fracture of the horizontal structural member.
According to the fifth joint metal, the coupling plate includes the coupling hole and the second deficient portion. The coupling hole allows insertion the rod-shaped coupling tool, which passes through the horizontal structural member, within the groove formed over the vertical direction on the end surface of the horizontal structural member. The second deficient portion is along the straight line that passes through the center of the coupling hole, and is formed to be long in the vertical direction between the adjacent coupling holes. Therefore, when an excessive load acts on the joint portion between the support material and the horizontal structural member, the peripheral area of the coupling hole deforms. This allows reducing the fracture of the horizontal structural member. Additionally, increasing the deficient amount in the vertical direction including the coupling hole, which receives the stress from the coupling tool, allows controlling the deformation of the joint metal so as to reduce the variation in resistance on the joint portion. Additionally, this allows improving the resistance against a tension load that acts on the horizontal structural member toward the horizontal direction side of the coupling plate.
According to the sixth joint metal, the third deficient portion in the arc shape centered at the coupling hole is formed in the peripheral area of the coupling hole. Therefore, when an excessive load acts on the joint portion between the support material and the horizontal structural member, the peripheral area of the coupling hole locally deforms. This allows reducing the fracture of the horizontal structural member, and allows controlling the deformation of the entire joint metal so as to reduce the variation in resistance of the joint portion. Additionally, the fourth deficient portion is along the straight line that passes through the center of the coupling hole, and is formed to be long in the vertical direction between the adjacent coupling holes. Therefore, increasing the deficient amount in the vertical direction including the coupling hole, which receives the stress from the coupling tool, allows controlling the deformation of the joint metal so as to reduce the variation in resistance of the joint portion.
According to the seventh joint metal, the third deficient portion in the arc shape centered at the coupling hole is formed in the peripheral area of the coupling hole. This allows more efficiently causing local deformation of the peripheral area of the coupling hole when an excessive load acts on the joint portion between the support material and the horizontal structural member.
According to the eighth joint metal, the plurality of the third deficient portions are formed in the arc shapes centered at the coupling hole with the same diameter. One of the portions between the end portions of the deficient portions adjacent to one another in the circumferential direction is disposed to be positioned on the horizontal straight line passing through the center of the coupling hole and on the distal end side of the coupling plate with respect to the coupling hole in the horizontal direction. This allows improving the resistance against a tension load that acts on the horizontal structural member toward the horizontal direction side of the coupling plate.
According to the ninth joint metal, the third deficient portion is formed symmetrically to the horizontal straight line passing through the center of the coupling hole. Therefore, in either case where an excessive load acts on the horizontal structural member upward or downward in the vertical direction, the peripheral area of the coupling hole efficiently deforms. This allows reducing the fracture of the horizontal structural member.
According to the tenth joint metal, the coupling plate includes the pin groove and the fifth deficient portion and/or the sixth deficient portion. The pin groove is formed on the upper end of the coupling plate. The fifth deficient portion is formed by cutting out in the arc shape in the peripheral area of the pin groove. The sixth deficient portion is formed by cutting out to be long in the vertical direction between the pin groove and the coupling hole adjacent to the pin groove. Therefore, when an excessive load acts on the joint portion between the support material and the horizontal structural member, the peripheral area of the pin groove locally deforms. This allows reducing the fracture of the horizontal structural member and allows controlling the deformation of the entire joint metal so as to reduce the variation in resistance of the joint portion.
According to the eleventh joint metal, the coupling plate includes the coupling hole and the seventh deficient portion. The coupling hole allows insertion of the rod-shaped coupling tool, which passes through the horizontal structural member, within the groove formed over the vertical direction on the end surface of the horizontal structural member. The seventh deficient portion is in communication with the coupling hole, and is formed to be long along the horizontal straight line. Therefore, when an excessive load acts on the joint portion between the support material and the horizontal structural member, the peripheral area of the coupling hole deforms. This allows reducing the fracture of the horizontal structural member. Additionally, the deficient portion is formed to be long in the horizontal direction of the coupling hole. This allows inducing stable lateral displacement deformation of the joint metal so as to reduce the variation in resistance of the joint portion. Additionally, this does not ruin the rigidity of the region other than the peripheral area of the coupling hole, thus maintaining relatively high yield resistance so as to improve the proof stress evaluation value.
According to the twelfth joint metal, the seventh deficient portion has the vertical width smaller than the diameter of the coupling hole. This allows preventing movement of the coupling tool from the coupling hole in the horizontal direction.
According to the thirteenth joint metal, the securing-plate reinforcing bead is disposed. The securing-plate reinforcing bead projects from the back-side portion of the securing plate in contact with the side surface of the support material toward the projection direction of the coupling plate. This allows improving the rigidity of the securing plate, so as to suppress falling over of the coupling plate when the securing plate is fastened with a fixture such as a bolt due to pulling the securing plate to the bolt side. Additionally, as described above, the rigidity of the securing plate can be improved so as to suppress falling over of the coupling plate. This allows thinning the plate thicknesses of the securing plate and the coupling plate while ensuring high strength.
According to the fourteenth joint metal, the securing-plate reinforcing bead is formed in the shape where the plurality of the arcs communicate with one another in the vertical direction centered at the fixing holes so as to surround the peripheral areas of the fixing holes. This allows efficiently improving the strength around the fixing holes of the securing plate, thus more reliably suppressing falling over of the coupling plate when the securing plate is fastened with a fixture such as a bolt.
According to the fifteenth joint metal, the reinforcing rib is further disposed on the bended portion at the boundary between the securing plate and the coupling plate. This allows improving the strength of the bended portion, thus suppressing falling over of the coupling plate when the securing plate is fastened with a fixture such as a bolt.
According to the sixteenth joint metal, the reinforcing rib is disposed on the bended portion at the boundary between the securing plate and the coupling plate. This allows improving the strength of the bended portion, thus suppressing falling over of the coupling plate when the securing plate is fastened with a fixture such as a bolt. Additionally, as described above, the strength of the bended portion can be improved so as to suppress falling over of the coupling plate. This allows thinning the plate thicknesses of the securing plate and the coupling plate while ensuring high strength.
According to the seventeenth joint metal, the reinforcing rib is disposed in each portion between the fixing holes adjacent to one another in the vertical direction. This allows ensuring high strength in any position of the bended portion in the vertical direction, thus more reliably suppressing falling over of the coupling plate when the securing plate is fastened with a fixture such as a bolt.
According to the eighteenth joint metal, the bended-portion reinforcing bead is disposed in communication with the securing plate from the coupling plate through the bended portion at the boundary between the securing plate and the coupling plate. This allows improving the strength of the bended portion, thus suppressing falling over of the coupling plate when the securing plate is fastened with a fixture such as a bolt. Additionally, as described above, the strength of the bended portion can be improved so as to suppress falling over of the coupling plate. This allows thinning the plate thicknesses of the securing plate and the coupling plate while ensuring high strength.
According to the nineteenth joint metal, the end-portion reinforcing beads are further disposed on both the end portions in the width direction of the securing plate. The end-portion reinforcing bead is long in the vertical direction, and projects from the back-side portion of the securing plate in contact with the side surface of the support material toward the projection direction of the coupling plate. This allows improving the strength of both the ends in the width direction of the securing plate, thus more reliably suppressing falling over of the coupling plate when the securing plate is fastened with a fixture such as a bolt.
With the building structure according to the present invention, when an excessive load acts on the joint portion between the support material and the horizontal structural member, the peripheral area of the coupling hole of the coupling plate to be coupled to the horizontal structural member deforms. This allows reducing the fracture of the horizontal structural member, thus reducing the variation in resistance. Additionally, this does not ruin the rigidity of the region other than the peripheral area of the coupling hole, thus maintaining relatively high yield resistance so as to improve the proof stress evaluation value. Additionally, this allows suppressing falling over of the coupling plate when the securing plate is fastened with a fixture such as a bolt, so as to thin the plate thicknesses of the securing plate and the coupling plate while ensuring high strength.
The following describes embodiments of a joint metal according to the present invention with reference to the drawings. As illustrated in
The securing plate 4 is secured to the side surface of the support material 2 in contact with each other. As illustrated in
The coupling plates 5 are coupled to the horizontal structural member 3. As illustrated in
The pin groove 51 is formed on the upper end of the coupling plate 5 so as to receive the drift pin 8. The plurality of coupling holes 52 is formed to be aligned in the vertical direction below the pin groove 51. The sixth deficient portion 531 and the plurality of second deficient portions 532 and 533 are formed in vertically long slit shapes while passing through a straight line A, on which the pin groove 51 and the plurality of coupling holes 52 are arranged, in the vertical direction. On the end surface of the horizontal structural member 3, grooves 31 for allowing insertion of the pair of the respective coupling plates 5 are formed over the longitudinal direction (vertical direction). On the side surface of the horizontal structural member 3, a plurality of pinholes 32 into which the drift pin 8 driven is formed to be aligned in the longitudinal direction. When this horizontal structural member 3 and the coupling plates 5 are coupled to each other, firstly, the horizontal structural member 3 is moved so as to be positioned on the upper side of the joint metal 1 where the securing plate 4 is secured to the side surface of the support material 2. At this time, the drift pin 8 is preliminarily driven to the uppermost pinhole 32 of the horizontal structural member 3. Subsequently, the horizontal structural member 3 is gradually moved down until the drift pin 8 that has been driven is brought into contact with the pin groove 51. In a state where the pair of coupling plates 5 is inserted into the grooves 31 of the horizontal structural member 3, the drift pins 8 are driven to the remaining pinholes 32 so as to couple the horizontal structural member 3 and the coupling plate 5 together.
The sixth deficient portion 531 and the second deficient portions 532 and 533 formed in the coupling plate 5 are for reducing the fracture of the horizontal structural member by facilitating deformation of the peripheral area of the pin groove 51 and the coupling hole 52 when an excessive load acts on the joint portion between the support material 2 and the horizontal structural member 3 in a state where the coupling plate 5 and the horizontal structural member 3 are coupled together. As illustrated in
As illustrated in
The following describes a joint metal 1a according to a second embodiment of the present invention with reference to
In the joint metal 1a, three first deficient portions 54 are formed at equal spaces in the circumferential direction. The first deficient portions 54 are arc-shaped elongated holes having the same diameter centered at the coupling hole 52 in the peripheral area of the coupling hole 52. Additionally, two arc-shaped fifth deficient portions 55 are formed in the peripheral area of the lower side of the pin groove 51. The width perpendicular to the circumferential direction of the first deficient portion 54 and the fifth deficient portion 55 is formed to be equal to or less than half of the diameter of the coupling hole 52. Regarding the length of the arc, the first deficient portion 54 is formed to be longer than the fifth deficient portion 55. Accordingly, in the joint metal 1a, the first deficient portion 54 and the fifth deficient portion 55 are disposed only at the periphery of the coupling hole 52 and the pin groove 51. This allows efficiently deforming the peripheral area of the coupling hole 52 and the pin groove 51 when an excessive load acts on the joint portion between the support material 2 and the horizontal structural member 3 in a state where the coupling plates 5a and the horizontal structural member 3 are coupled together. Thus, the fracture of the horizontal structural member 3 can be reduced.
As illustrated by drawing diagonal lines in
In the joint metal 1a illustrated in
In a first deficient portion 54b of the joint metal 1a illustrated in
The following describes a joint metal 1b according to a third embodiment of the present invention with reference to
As illustrated in
The following describes a joint metal 1c according to a fourth embodiment of the present invention with reference to
A coupling plate 5c of the joint metal 1c has the seventh deficient portion 59 cut out in communication with the coupling hole 52. This seventh deficient portion 59 is formed to be long along a horizontal straight line C passing through the coupling hole 52. The width in the vertical direction of this seventh deficient portion 59 is formed to be smaller than the diameter of the coupling hole 52, and is formed from the coupling hole 52 toward respective both sides of the base end side and the distal end side of the coupling plate 5c. A length W3 of a seventh deficient portion 59a is formed to be longer than a length W4 of a seventh deficient portion 59b. The length W3 is formed to be elongated toward the base end side. The length W4 is formed to be elongated toward the distal end side. In this joint metal 1c where the seventh deficient portions 59 are formed on the coupling plate 5c, when an excessive load acts on the joint portion between the support material 2 and the horizontal structural member 3 in a state where the coupling plate 5c and the horizontal structural member 3 are coupled together, the peripheral area of the coupling hole 52 can be efficiently deformed. This allows reducing the fracture of the horizontal structural member 3. Additionally, this allows improving the rigidity of the region other than the peripheral area of the coupling hole 52. Here, while in this embodiment deficient portions are not formed in the peripheral area on the lower side of the pin groove 51, the sixth deficient portion 531 in the vertically elongated slit shape as illustrated in
The following describes proof stress evaluation tests using the joint metals 1, 1a, and 1c according to the present invention. The testing method and the shape of the specimen are compliant with the description in page 583 of “Allowable stress design for houses using timber framework method (2008 edition)” (hereinafter referred to as Document). The test employs a specimen in a structure where one horizontal structural member is supported by two support materials. For the joint portions in two positions where the horizontal structural member and the support material are to be joined together, the same joint metal is used. In the test, a pressure plate made of steel is placed on the top surface of the horizontal structural member. When the load acts on the center of the pressure plate, displacement of the horizontal structural member is measured. Then, based on the graph showing the relationship between the measured displacement and the load, a proof stress evaluation value is calculated. Displacement meters are disposed four positions in total on the near side and the far side on the bottom surface near the respective end portions of the horizontal structural member, so as to calculate the average of the respective measured values as a displacement amount. For the test, joint metals in shapes described in the following working examples 1 to 3 and comparative examples 1 and 2 were used. During the test, respective three specimens are used to calculate the average. Here, the respective joint metals are different only in shape of the deficient portion. The joint metals are otherwise similar to one another.
The working example 1 employs the joint metal 1 illustrated in
The working example 2 employs the joint metal 1a where the first deficient portions 54 and the fifth deficient portions 55 in the arc shapes are formed on the coupling plate 5a as illustrated in
The working example 3 employs the joint metal 1c where the seventh deficient portions 59 in the horizontally long slit shapes are formed in communication with the coupling hole 52 as illustrated in
The comparative example 1 employs a conventional joint metal 100a where the deficient portions are not formed on a coupling plate 101a as illustrated in
As illustrated in
Table 1 below shows the result of the proof stress evaluation tests of the working examples 1 to 3 and the comparative examples 1 and 2. Here, Py (kN) shown in Table 1 shows yield resistance, and ⅔Pmax (kN) is obtained by multiplying the maximum load (Pmax) by ⅔. These values can be calculated from the graph illustrating the relationship between the measured displacement and the load using the method described in pages 571 and 572 of Document. The dispersion coefficient is calculated as a dispersion coefficient=1−a variation coefficient CV×k in compliance with the description in page 586 of Document. Note that k is set to a value of 3.152 corresponding to three as the number of specimens here. Table 1 shows Py (kN) and ⅔Pmax (kN) of the average values of three specimens when the tests were performed under the respective conditions of the working examples 1 to 3 and the comparative examples 1 and 2. The respective evaluation values shown on the last lines of these Py and ⅔Pmax are calculated with the method (calculating the dispersion coefficient×the average value) described in page 586 of Document. Additionally, an initial rigidity K (kN/mm) shown in Table 1 is calculated in compliance with the description in page 572 of Document while an energy E (kN·mm) is considered as the area of a perfect elasto-plastic model in page 572 of Document. Additionally, an initial crack occurrence displacement D (mm) denotes a displacement for test evaluation when occurrence of a crack is seen in the position of the drift pin.
As illustrated in Table 1, when the working examples 1 to 3 are compared with the comparative example 1, in the yield resistance Py, the average values keep values equivalent to that of the comparative example 1 while the dispersion coefficients have been considerably improved in all of the working examples 1 to 3. Accordingly, the proof stress evaluation values have been obviously improved. Additionally, in ⅔Pmax, the average values keep values equivalent to that of the comparative example 1 while the dispersion coefficients have been considerably improved in all of the working examples 1 to 3. Accordingly, the proof stress evaluation values have been obviously improved. In the initial rigidity and the energy, there was no noticeable reduction in the respective average values in any of the working examples 1 to 3 compared with the comparative example 1.
When the working examples 1 to 3 are compared with the comparative example 2, in the yield resistance Py, there is no reduction in the average value like the comparative example 2 in any of the working examples 1 to 3. The dispersion coefficients of the working examples 1 to 3 have not improved as much as that of the comparative example 2 have, but has been improved. Accordingly, the proof stress evaluation values have been improved equally or more than the comparative example 2 with respect to the comparative example 1. Additionally, in ⅔Pmax, there is no reduction in the average value like the comparative example 2 in any of the working examples 1 to 3. The dispersion coefficients of the working examples 1 to 3 have been improved equally or more than that of the comparative example 2. Accordingly, the proof stress evaluation values have been obviously improved. In the initial rigidity and the energy, there was no considerable reduction in the average value like the comparative example 2 in any of the working examples 1 to 3. The initial rigidity and the energy were equivalent to those of the comparative example 1.
In this embodiment, the description has been given of the joint metals 1 to 1c that have the U shapes in top view and include the pairs of coupling plates 5 to 5c, the coupling plate is not necessarily limited to the pairs of the coupling plates 5a to 5c. The present invention is applicable to a joint metal that has a T shape in top view and includes only one of the coupling plates 5 to 5c.
The following describes embodiments where reinforcement is performed to suppress falling over of the coupling plates 5 as illustrated in
As illustrated in
In this joint metal 1d, as illustrated in
The reinforcing rib 10 is formed by, for example, press work or similar work so as to project inwardly in an approximately triangular shape in top view as illustrated in
Here, in this embodiment, the description has been given of the example where the reinforcing ribs 10 are disposed in the joint metal where the sixth deficient portion 531, which is formed by cutting out the peripheral area on the lower side of the pin groove 51, and the plurality of second deficient portions 532 and 533, which are formed by cutting out the peripheral area of the coupling hole 52, are formed on the coupling plate 5 similarly to the joint metal 1 according to the first embodiment illustrated in
The following describes a joint metal 1e according to a sixth embodiment of the present invention with reference to
As illustrated in
In a joint metal 1f according to a seventh embodiment of the present invention illustrated in
The following describes a joint metal 1g according to an eighth embodiment of the present invention with reference to
As illustrated in
The following describes a joint metal 1h according to a ninth embodiment of the present invention with reference to
A plurality of the bended-portion reinforcing beads 12a are disposed at shorter intervals in the vertical direction than the bended-portion reinforcing beads 12 disposed in the joint metal 1g according to the eighth embodiment. Additionally, a width L9 of the bended-portion reinforcing bead 12a is formed to be a width larger than the width L8 of the bended-portion reinforcing bead 12 disposed in the joint metal 1g according to the eighth embodiment.
As illustrated in
The following describes the experiment results of the measurement of the deformation amount in the pair of coupling plates 5 when the securing plates 4 of the joint metals 1d to 1g according to the present invention are fastened with the bolts 6 so as to be secured to the support material 2 as illustrated in
The working example 4 employs the joint metal 1e where the securing-plate reinforcing beads 11 are disposed as illustrated in
As illustrated in
The working example 6 employs the joint metal 1d where the reinforcing ribs 10 are disposed as illustrated in
As illustrated in
The comparative example 3 employs a joint metal where any of the reinforcing rib 10, the securing-plate reinforcing bead 11, and the bended-portion reinforcing bead 12 in the working examples 4 to 7 is not disposed and where the plate thickness t of the securing plate 4 and the coupling plate 5 is 3.2 mm.
The comparative example 4 employs a joint metal where any of the reinforcing rib 10, the securing-plate reinforcing bead 11, and the bended-portion reinforcing bead 12 in the working examples 4 to 7 is not disposed.
Table 2 below shows the measurement result of the working examples 4 to 7 and the comparative examples 3 and 4. Table 2 shows the size of the distance W11 of the pair of coupling plates 5 in the position of Q illustrated in
As illustrated in Table 2, the working examples 4 to 7 are found to ensure equivalent or superior performances compared with the working example 3, which employs the joint metal where the plate thickness t of the securing plate 4 and the coupling plate 5 is formed to be thick like the conventional joint metal.
The working examples 4 to 7 are found to considerably improve the strength compared with the case using the joint metal where reinforcement is not performed and the plate thickness t of the securing plate 4 and the coupling plate 5 is thinned like the comparative example 4. Especially, at a high torque of 80 N·m, the difference is large.
Based on the measurement result in Table 2, as illustrated in the working examples 4 to 7, using the joint metal where any of the reinforcing rib 10, the securing-plate reinforcing bead 11, and the bended-portion reinforcing bead 12 is disposed allows suppressing falling over of the pair of coupling plates 5 as illustrated in
Here, the embodiment of the present invention is not limited to the above-described embodiments. Various modifications are possible without departing from the technical scope of the present invention.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/JP2020/024611 | 6/23/2020 | WO |
