JP2012172337A - Joint metal fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint metal fitting with improved strength and rigidity.SOLUTION: A joint metal fitting 1 is to be attached to a joint part of respective wood materials (a column 11 and a base 12, for instance) constituting a frame of a wooden building. The joint metal fitting 1 includes: a back plate 2 arranged at a prescribed distance from the base 12 and fixed to the column 11 by screwing a tapping screw 4 inserted to a hole 3 to the column 11; a bottom plate 5 arranged at a prescribed distance from the column 11 and fixed to the base 12 by screwing a tapping screw 8 inserted to a hole 7 to the base 12; and an intermediate plate 9 provided so as to connect end edges 2a and 5a of the back plate 2 and the bottom plate 5. The intermediate plate 9 is provided with an opening 10 so that an inner peripheral edge thereof includes the end edge 5a of the bottom plate 5 near the end edge 5a. Also, an extension part 6b extending toward the column 11 is provided from a part forming the inner peripheral edge of the opening 10 of the end edge 5a of the bottom plate 5, and a hole 7a to which a tapping screw 8a is inserted is provided on a position including a part to be the extension part 6b.

Description

  The present invention relates to a joining metal fitting that is attached to a joining portion of each timber constituting a framework of a wooden building and improves the joining force at the joining portion.

  Each piece of wood that makes up the framework of a wooden building is joined by combining the tenon and mortise provided on each piece of wood, but usually a joint fitting is attached to the joint to improve the joint strength. I try to let them.

  Conventionally, various shapes of joint fittings have been provided. Among them, a general shape is formed in an approximately L shape. As shown in FIG. 4, the joint fitting 101 includes a back plate 102 formed by bending a steel plate and fixed to a vertical member 111 such as a column, and a bottom plate 103 fixed to a cross member 112 such as a base. ing. The back plate 102 is provided with a plurality of holes 105 through which fixing members 104 such as tapping screws are inserted in order to fix the back plate 102 to the vertical member (column) 111. Further, the bottom plate 103 is provided with a plurality of holes 107 through which a fixing member 106 such as a tapping screw is inserted in order to fix it to the cross member (base) 112.

However, the substantially L-shaped joining metal fitting 101 is attached to the tenon 113 provided in the column 111 from the hole 107a located closest to the column 111 among the holes 107 provided in the bottom plate 103. because the distance L ₁ is shorter, for example, when screwing the tapping screw 106a through the hole 107a in such an impact screwdriver, an impact driver would hit the pillar 111, such as can not be screwed at right angles tapping screws 106a on the base 112 Due to the poor workability, the tapping screw 106a may not be able to exhibit a sufficient holding force. Furthermore, the grip margin of the tapping screw 106a inserted through the hole 107a is reduced, and the tensile strength of the tapping screw 106a may be reduced. Note that the gripping margin is an area necessary for sufficiently exerting the holding force of the tapping screw 106 (106a) screwed into the base 112.

Further, as shown in FIG. 5, there is a joint fitting 201 in which an intermediate plate 208 is provided between the back plate 202 and the bottom plate 203. Similar to the above-described joining metal fitting 101 (see FIG. 4), the back plate 202 is provided with a plurality of holes 205 through which the tapping screws 204 are inserted in order to fix the joining metal fitting 201 to the pillar 111. The bottom plate 203 is provided with a plurality of holes 207 through which the tapping screws 206 are inserted to fix the bottom plate 203 to the base 112. In the joining metal fitting 201, since the intermediate plate 208 is provided so as to connect the edges 202a and 203a of the back plate 202 and the bottom plate 203 on the side close to each other, the back plate 202 and the bottom plate 203 are respectively connected to the base 112 and The tapping screw 206a inserted into the hole 207a located closest to the column 111 among the tapping screws 206 of the bottom plate 203 is fixed at a position away from the column 111, and is screwed into a position away from the column. it can. That is, the distance L ₂ from the hole 207a closest to the column 111 to the tenon 113 provided in the column 111 is longer than the distance L ₁ (see FIG. 4). As a result, the tapping screw 206a can be screwed at a right angle with an impact driver or the like, and the gripping margin of the tapping screw 206a is increased, so that the tensile strength of the tapping screw 206a can be improved. In the joint fitting 201, the bottom plate 203 is fixed by two tapping screws 206, both of which are tapping screws 206 a that are inserted through holes 207 a that are closest to the pillar 111.

  Note that a joint fitting in which an intermediate plate is provided between a back plate and a bottom plate is disclosed in, for example, Patent Document 1 below.

JP 2001-200591 A

  By the way, when a shake such as an earthquake occurs, the building is deformed around a rigid center with a force applied to its center of gravity. At this time, as shown in FIG. 6, three stresses of tension a, shear b, and bending c act on the joint portion between the column 111 and the base 112. Therefore, it is desirable that the joint fitting has a resistance to all the stresses of the tension a, the shear b, and the bending c.

  However, in the joint fitting 201, the tapping screw 204 is screwed into the column 111 and the tapping screw 206a is screwed into the base 112 so as to resist the pulling force a. However, as described above, the joint portion between the column 111 and the base 112 is held. Three stresses of tension a, shear b, and bend c act on. At this time, the longer the distance from the column 111, the greater the shearing force b and the bending force c, and the bent portion of the joint fitting 201 (the boundary portion between the intermediate plate 208 and the bottom plate 203) serves as a fulcrum, as if it were a bar. A bending force c for pulling out the tapping screw 206a acts, and a shearing force b for breaking the tapping screw 206a from the vicinity of the head acts. Furthermore, since the tapping screw 206a screwed into a position near the bent portion suppresses the deformation of the joint fitting 201, the toughness of the joint fitting 201 is lowered.

  As described above, in order to improve the workability of the impact driver and screw the tapping screw 206a correctly, screwing the tapping screw 206a at a position away from the column 111 is not only the tensile force a but also the shearing force b and the bending force c. This increases the combined force and causes the holding force to decrease. That is, the conventional joint metal 201 has a limit in strength because the load applied to the tap metal screw 206a is large, and the toughness is reduced due to the arrangement of the tap screw 206a that suppresses deformation of the metal joint 201, and as a result, Strength decreases. The strength refers to the strength with which the joint fitting maintains its attached state. Therefore, the strength is higher when there is some toughness.

  Moreover, in the conventional joining metal fitting 201, since the bottom plate 203 is separated from the column 111, the center of gravity and the position of the rigid center are also separated, and as a result, the rigidity is lowered.

  Therefore, the present invention has been made in view of the above situation, and has as its first object to provide a joint fitting having improved strength by increasing toughness to some extent, and further has improved strength and rigidity at the same time. A second object is to provide a joint fitting.

Next, means for solving the above problems will be described with reference to the drawings corresponding to the embodiments.
The joining metal fitting according to claim 1 according to the present invention is a joining metal fitting 1 attached to a joining portion of each wood constituting a framework of a wooden building,
A fixing member 4 which is disposed on one wood 11 in the joint portion at a predetermined distance from the other wood 12 and through which the hole 3 is inserted enters the one wood 11 through the hole 3, thereby the wood. A back plate 2 fixed to 11;
A fixing member 8 disposed on the other wood 12 at a predetermined distance from the one wood 11 and having the hole 7 inserted into the other wood 12 enters the other wood 12 through the hole 7. A fixed bottom plate 5;
In the joint fitting 1 provided with an intermediate plate 9 provided so as to connect between the edges 2a, 5a of the back plate 2 and the bottom plate 5 on the side close to each other,
The boundary part between the intermediate plate 9 and the bottom plate 5 is characterized in that the rigidity of the boundary part is weakened so that the boundary part has stickiness.

  According to such a configuration, the rigidity of the boundary portion between the intermediate plate 9 and the bottom plate 5 is reduced. Thereby, when the force which pulls out the fixing member 8 acts on the joining metal fitting 1, the boundary part of the intermediate | middle board 9 and the baseplate 5 comes to plastically deform, and it has the toughness which was not in the conventional joining metal fitting. Become.

The joint metal fitting according to claim 2 is a joint metal fitting 1 attached to a joint portion of each timber constituting a framework of a wooden building,
A fixing member 4 which is disposed on one wood 11 in the joint portion at a predetermined distance from the other wood 12 and through which the hole 3 is inserted enters the one wood 11 through the hole 3, thereby the wood. A back plate 2 fixed to 11;
A fixing member 8 disposed on the other wood 12 at a predetermined distance from the one wood 11 and having the hole 7 inserted into the other wood 12 enters the other wood 12 through the hole 7. A fixed bottom plate 5;
In the joint fitting 1 provided with an intermediate plate 9 provided so as to connect between the edges 2a, 5a of the back plate 2 and the bottom plate 5 on the side close to each other,
The intermediate plate 9 is characterized in that an opening 10 is provided in the vicinity of the adjacent edge 5a of the bottom plate 5 so as to include the edge 5a on the inner periphery thereof.

  According to such a configuration, since the opening 10 is provided, the rigidity of the boundary portion between the intermediate plate 9 and the bottom plate 5 is reduced. As a result, as described above, the boundary portion between the intermediate plate 9 and the bottom plate 5 is plastically deformed when a force for pulling out the fixing member 8 is applied to the joint fitting 1 and has toughness that has not existed before. Become.

  The joint fitting according to claim 3, wherein an extending portion that extends toward the one wood 11 from a portion that forms an inner peripheral edge of the opening 10 at the adjacent edge 5 a of the bottom plate 5. 6 b is provided, and at least one of the holes 7 (7 a) through which the fixing member 8 (8 a) is inserted to fix the bottom plate 5 is provided at a position including a portion that becomes the extension portion 6 b. It is characterized by that.

  According to such a configuration, the extending portion 6b resists a force (bending force) to pull out the fixing member 8a like a bar with the boundary portion between the intermediate plate 9 and the bottom plate 5 as a fulcrum, thereby fixing the fixing member 8a. Acts to prevent pulling out Further, the hole 7a through which the fixing member 8a is inserted can be formed at a boundary portion between the intermediate plate 9 and the bottom plate 5, that is, at a position where the center of gravity and the center of gravity acting on the joint fitting 1 are close to each other.

  According to the present invention, the joining bracket has predetermined toughness by intentionally weakening the rigidity of the boundary portion between the intermediate plate and the bottom plate and promoting the deformation of the boundary portion. As a result, the strength of the joint fitting is improved.

  In addition, by providing a hole through which a fixing member for fixing the bottom plate is inserted at a position close to one piece of wood, the fixing member approaches one piece of wood, so that it is close to the center of gravity and has a shearing force acting on the joint portion. Bending force can be reduced. Thereby, the tensile strength of the fixing member is improved. As a result, the strength of the joint fitting is improved.

  Furthermore, the fact that the fixing member for fixing the bottom plate approaches one of the timbers means that the distance between the center of gravity of the force and the center of gravity is reduced, and the rigidity of the joint fitting is improved along with the strength. That is, the strength and rigidity of the joint fitting are improved at the same time.

It is a perspective view which shows embodiment of the joining metal fitting by this invention. It is a perspective view which shows the state which attached the embodiment to the junction part. It is a sectional side view which shows the state which attached the embodiment to the junction part. It is a perspective view which shows the conventional joining metal fitting (substantially L-shaped joining metal fitting). It is a perspective view which shows the conventional joining metal fitting (joining metal fitting provided with the intermediate | middle board). In FIG. 5, it is a sectional side view which shows each stress added to a junction part.

Embodiments of the present invention will be specifically described below with reference to the drawings.
In this embodiment (joint fitting 1), in order to improve the joining force at the joining part of each timber (column and base, cross member such as girder, etc.) constituting the framework of the wooden building, the joining part It can be attached to. In the following description, one piece of wood 11 in the joining portion to which the joining fitting 1 is attached is used as a column, and the other piece of wood 12 is used as a base.

  As shown in FIGS. 2 and 3, a tenon 11a is provided at the mouth of the pillar 11 which is one piece of wood. Further, a mortise 12b for fitting the tenon 11a of the pillar 11 is provided in the base 12 which is the other wood. The column 11 and the base 12 are joined by fitting a tenon 11 a provided on the column 11 into a mortise 12 a provided on the base 12.

  As shown in FIG. 1, the joint fitting 1 is formed by bending a steel plate by pressing or the like, and includes a back plate 2, a bottom plate 5, and an intermediate plate 9 provided between the back plate 2 and the bottom plate 5. It has.

  Among the above portions, the back plate 2 is a portion that is disposed at a predetermined position of the column 11 when the joining bracket 1 is attached. At this time, it is arranged at a predetermined distance from the base 12. The back plate 2 is formed in a substantially rectangular shape, and a hole 3 is provided on the surface thereof. In this embodiment, the back plate 2 includes four holes 3 provided one by one near the four corners. A tapping screw 4 which is a fixing member is inserted into each hole 3, and the back plate 2 is formed by the tapping screw 4 inserted into the hole 3 entering the column 11 through the hole 3, that is, the tapping screw 4 is By being screwed into the column 11, the column 11 is fixed at a predetermined position.

  Among the above portions, the bottom plate 5 is a portion that is disposed at a predetermined position of the base 12 in the attachment state of the joint fitting 1. At this time, they are arranged at a predetermined distance from the pillar 11. The surface of the bottom plate 5 is substantially orthogonal to the surface of the back plate 2, and a portion continuing from an intermediate plate 9 described later is a fixing portion 6 a. A hole 7 is provided in the surface of the bottom plate 5. In this embodiment, the bottom plate 5 has three holes 7. One of the holes 7a is provided at a position including a portion to be an extension portion 6b described later. That is, the hole 7a is provided at a position closest to the column 11 (in addition, other holes are distinguished from the hole 7a and are indicated by a reference numeral 7b). A tapping screw 8 (8a, 8b) as a fixing member is inserted into each hole 7a, 7b, and the tapping screw 8a, 8b inserted into the hole 7a, 7b is inserted into the base plate 12 via the hole 7a, 7b. In other words, when the tapping screws 8 a and 8 b are screwed into the base 12, the base 12 is fixed at a predetermined position.

  Among the above portions, the above-described intermediate plate 9 is provided so as to connect the end plates 2a and 5a on the side close to each other of the back plate 2 and the bottom plate 5 (fixed portion 6a). The intermediate plate 9 is provided so as to be an inclined surface having a predetermined angle when the joining metal fitting 1 is attached. In this embodiment, the joint fitting 1 is bent so that the distance between the back plate 2 and the intermediate plate 9 is 153 degrees, and is bent so that the distance between the intermediate plate 9 and the bottom plate 5 is 117 degrees. Yes.

  Further, the intermediate plate 9 is provided with an opening 10 in the vicinity of an edge (an edge on the side close to the back plate 2) 5 a of the bottom plate 5. The opening 10 is provided so as to include the end edge 5a of the bottom plate 5 at the inner peripheral edge thereof.

  At the edge 5a of the bottom plate 5 (fixed portion 6a), the above-described extending portion 6b extending toward the column 11 is provided from the portion forming the inner peripheral edge of the opening 10 provided in the intermediate plate 9. It has been. In this embodiment, when the opening 10 of the intermediate plate 9 is provided, the extended portion 6b can be provided by leaving the cut-out portion without cutting it.

  As shown in FIGS. 2 and 3, in a state where the joining metal fitting 1 is attached to the joining portion of the column 11 and the base 12, particularly in the bottom plate 5, in the hole 7 a closest to the column 11 as shown in FIG. 3. The inserted tapping screw 8 a is screwed into a position away from the column 11. Note that the distance L from the tenon 11a of the column 11 to the tapping screw 8a is such that a mounting tool such as an impact driver can be screwed into the tapping screw 8a without hitting the column 11, so that the gripping margin is sufficient. It will be something you can afford.

  Moreover, in the joining metal fitting 1, when a bending portion (a boundary portion between the intermediate plate 9 and the bottom plate 5) serves as a fulcrum and a force for pulling out the tapping screw 8 a acts like a bar, the position closest to the column 11. Since the tapping screw 8a inserted through the hole 7a is closer to the column 11 than the tapping screw 206a (see FIG. 5) of the conventional fitting 201, the distance between the force rigid center and the center of gravity is reduced.

  According to the above-described embodiment, since the opening 10 is provided in the intermediate plate 9, the rigidity of the boundary portion between the intermediate plate 9 and the bottom plate 5 is reduced. Thereby, when the force which pulls out the tapping screw 8a acts on the joining metal fitting 1, the boundary part of the intermediate | middle board 9 and the baseplate 5 comes to plastically deform. That is, it has a predetermined toughness. As a result, the strength is improved.

  In addition, by providing the hole 7a through which the tapping screw 8a of the bottom plate 5 is inserted at a position close to the column 11, the tapping screw 8a approaches the column 11, so that it is close to the center of gravity and can reduce shearing force and bending force. it can. Thereby, the tensile strength of the tapping screw 8a is improved. As a result, the strength is improved as described above.

  Further, the extending portion 6b acts so as to suppress the joint metal fitting 1 from rotating toward the column 11 with the tapping screw 8a serving as a fulcrum, by resistance.

  In addition, since the hole 7a through which the tapping screw 8a is inserted can be formed at the boundary portion between the intermediate plate 9 and the bottom plate 5, that is, at a position where the center of gravity acting on the joint fitting 1 and the center of gravity are close to each other. Stiffness is improved.

  In the above-described embodiment, the back plate 2 is fixed to the column 11 and the bottom plate 5 is fixed to the base 12. For example, the joining metal 1, the back plate 2 is fixed to the base 12, and the bottom plate 5 is It is also possible to attach the column 11 so as to be fixed.

  Moreover, although embodiment mentioned above is the structure by which the opening part 10 and the extension part 6b were provided only in the edge 5a vicinity of the baseplate 5, the edge of the backplate 2 (end on the side close to the baseplate 5) Edge) 2a can also be provided.

  Further, in the above-described embodiment, by providing the opening 10, the rigidity of the boundary portion between the intermediate plate 9 and the bottom plate 5 is intentionally weakened to obtain toughness in this portion, but the opening 10 is not provided. In addition, for example, it is possible to obtain a predetermined toughness by forming the boundary portion between the intermediate plate 9 and the bottom plate 5 to be thinner than the other portions.

DESCRIPTION OF SYMBOLS 1 ... Joining metal fitting 2 ... Back plate 2a ... End edge of the side close to the bottom plate (back plate) 3 ... Hole 4 ... Tapping screw as a fixing member 5 ... Bottom plate 5a ... On the side close to the back plate (of the bottom plate) Edge 6a ... Extension part 7 (7a) ... Hole 8 (8a) ... Tapping screw which is a fixing member 9 ... Intermediate plate 10 ... Opening part 11 ... Pillar which is one wood 12 ... Base which is the other wood

Claims (3)

It is a joint fitting attached to the joint part of each timber constituting the framework of a wooden building,
A fixing member (4) arranged at a predetermined distance from the other wood (12) on one wood (11) in the joined portion and through which the hole (3) is inserted is inserted into the one wood through the hole (3). A back plate (2) fixed to the wood (11) by entering the wood (11) of
A fixing member (8), which is disposed on the other wood (12) at a predetermined distance from the one wood (11) and through which the hole (7) is inserted, is connected to the other wood through the hole (7). A bottom plate (5) fixed to the wood (12) by entering (12);
In a joining bracket (1) comprising: an intermediate plate (9) provided so as to connect between the edges (2a, 5a) of the back plate (2) and the bottom plate (5) adjacent to each other. ,
A joint fitting characterized in that the rigidity of the boundary portion is weakened so that the boundary portion between the intermediate plate (9) and the bottom plate (5) is sticky. It is a joint fitting attached to the joint part of each timber constituting the framework of a wooden building,
A fixing member (4) arranged at a predetermined distance from the other wood (12) on one wood (11) in the joined portion and through which the hole (3) is inserted is inserted into the one wood through the hole (3). A back plate (2) fixed to the wood (11) by entering the wood (11) of
A fixing member (8), which is disposed on the other wood (12) at a predetermined distance from the one wood (11) and through which the hole (7) is inserted, is connected to the other wood through the hole (7). A bottom plate (5) fixed to the wood (12) by entering (12);
In a joining bracket (1) comprising: an intermediate plate (9) provided so as to connect between the edges (2a, 5a) of the back plate (2) and the bottom plate (5) adjacent to each other. ,
The intermediate plate (9) is provided with an opening (10) in the vicinity of the adjacent edge (5a) of the bottom plate (5) so that the edge (5a) is included in the inner periphery thereof. Features a joint fitting.   An extending portion (6b) extends from the portion forming the inner peripheral edge of the opening (10) at the adjacent edge (5a) of the bottom plate (5) toward the one wood (11). A position including at least one hole (7a) of the hole (7) through which the fixing member (8a) is inserted in order to fix the bottom plate (5) to be the extending portion (6b) The joint metal fitting according to claim 2, wherein the joint metal fitting is provided.

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