Joining structure between wooden members and other members

Abstract

To provide a joining structure for wooden members and other members that eliminates the need to process openings in the wooden members or to close them with wooden plugs, while allowing the bolts connecting the steel plate and the wooden member to function under both tensile and compressive forces. [Solution] This is a joining structure 100 between a wooden member and another member, in which the end 12 of a wooden member 10 is joined to a steel plate 22 provided on another steel member 20. A steel connecting part 40 having a cylindrical member 41 and a flange 45 provided at one end and protruding laterally is inserted through a through hole 24 in the steel plate 22. A bolt 30 having a second male screw 36 passes through the connecting part 40 and is embedded inside the wooden member 10. The second male screw 36 is screwed into the first female screw 43 of the connecting part 40. A first nut 60 is screwed into the first male screw 42 in a region 48 of the cylindrical member 41 that protrudes from the surface 22b of the steel plate 22, so that the flange 45 and the first nut 60 sandwich the steel plate 22.

Description

Technical Field

[0001] The present invention relates to a joining structure between a wood member and other members.

Background Art

[0002] In a joining structure where wood members are applied to columns, beams, and parts of walls, which are components of a building structure, and steel members such as shape steel are applied to other members of the structure, and the wood members and steel members are joined, when the failure mode depends on the wood members, the load-displacement history characteristics become slip characteristics, and the seismic energy absorption performance of the joining structure generally becomes low. Therefore, in order to improve the seismic energy absorption performance of the joining structure, it is conceivable to take measures to cause the steel member to yield first as the failure mode.

[0003] For example, in a joining structure where a wood member and a steel member are joined via bolts such as long bolts, the bolts mainly bear the axial load. And this bolt is often joined to a steel plate which is a component of the steel member, and bolt-nut joining is applied by screwing the female thread of the nut onto the male thread of the bolt.

[0004] In this bolt-nut joining, when a tensile force acts on the bolt, its tensile strength functions and the effect is exerted. On the other hand, when a compressive force acts on the bolt, since the bolt can be pushed outwards and pulled out by the compressive force, there is a problem that the bolt does not function when the compressive force acts.

[0005] Therefore, by applying bolt-nut joining in which nuts are arranged on both sides so as to sandwich the steel plate, the bolt is inserted through the through holes of both nuts and the steel plate, and tightened with both nuts, it becomes possible to make the bolt function against both tensile force and compressive force.

[0006] Thus, in order to perform the installation by placing nuts on either side of a steel plate and tightening them, it is necessary to grip both nuts with a tool. Therefore, an opening of the necessary size for inserting and manipulating the tool must be provided in the area where the wooden member contacts the steel plate. This opening can ultimately be closed with a wooden plug of the same size to prevent the nuts or bolts from being exposed and spoiling the appearance of the joint structure. However, the effort required to create the opening in the wooden member and the effort required to finally close the opening with a wooden plug are challenges, and this challenge becomes even more pronounced as the number of bolted joints increases.

[0007] Based on the above, regarding a joint structure between a wooden member and another member, in which the end of the wooden member is joined to a steel plate provided by another steel member, a joint structure between a wooden member and another member is desired that eliminates the need to process an opening in the wooden member or to close the opening with a wooden plug or the like, while allowing the bolts connecting the steel plate and the wooden member to function under both tensile and compressive forces.

[0008] Here, Patent Document 1 proposes a joining structure for wooden structural materials. In this joining structure, multiple female screw holes are formed from the end grain of the wooden structural material in the direction of the material axis, and an anchor member, which has a hollow cylindrical shape and has male threads on its outer surface that are the same specifications as the female screw holes of the wooden structural material, and a female screw hole with a diameter slightly smaller than the diameter of the hollow part is formed near the back end of the hollow part, is screwed into the female screw holes of the wooden structural material and fixed in place. A connecting bolt has a male screw portion at its tip that is the same specifications as the female screw hole of the anchor member, and when the male screw portion is screwed into the female screw hole, its rear end protrudes from the end grain of the wooden structural material. The connecting bolt is installed on the wooden structural material by screwing its male screw portion into the female screw hole of the anchor member, and the rear end of the connecting bolt protruding from the end grain of the wooden structural material is joined to a steel frame or concrete joining block. [Prior art documents] [Patent Documents]

[0009] [Patent Document 1] Japanese Patent Publication No. 2007-231644 [Overview of the project] [Problems that the invention aims to solve]

[0010] In the joint structure for wood structural materials described in Patent Document 1, the anchor member functions against the tensile force acting on it, but it cannot function against the compressive force, and no means are disclosed to address this.

[0011] The present invention has been made in view of the above-mentioned problems, and relates to a joining structure for a wooden member and another member, in which the end of the wooden member is joined to a steel plate provided by another steel member, with the aim of providing a joining structure for a wooden member and another member in which the bolts connecting the steel plate and the wooden member can function against both tensile and compressive forces, while eliminating the need to process an opening in the wooden member or to close the opening with a wooden plug or the like. [Means for solving the problem]

[0012] To achieve the above objective, one embodiment of the joining structure between a wooden member and another member according to the present invention is: A joining structure between a wooden member and another member, wherein the end of the wooden member is joined to a steel plate provided by another steel member, A steel connecting component is inserted into a through hole provided in the steel plate with the flange facing the wooden member, and the other end of the cylindrical member protruding from the surface of the steel plate. The cylindrical member has a first female thread inside and a first male thread on its outer circumference, and a flange provided at one end of the cylindrical member that protrudes laterally. A bolt having a second male thread at least on one end is embedded inside the wooden member, passing through the connecting part, and the second male thread is screwed into the first female thread. The flange and the first nut are characterized in that the flange and the first nut sandwich the steel plate, by screwing the second female thread of the first nut into the first male thread of the cylindrical material in the portion that protrudes from the surface of the steel plate.

[0013] According to this embodiment, by engaging a steel connecting component with a through-hole in the steel plate of another member, screwing one end of a bolt into the first female thread of the connecting component, and screwing a first nut into the first male thread of the connecting component to join the connecting component to the steel plate, the bolt embedded in the wooden member and joined to the steel plate of the other member can function by exhibiting tensile and compressive resistance against both tensile and compressive forces acting on it. Furthermore, when forming the joint structure, it is unnecessary to process an opening in the wooden member or to close the opening with a wooden plug or the like, thus eliminating the problems of processing time and construction time.

[0014] Other steel components that can be mentioned here include shaped steel materials such as H-beams, channel steel, and angle steel.

[0015] Furthermore, other embodiments of the joining structure between a wood member and other members according to the present invention are: The outer shape of the end of the protruding region in the cylindrical material is characterized by being a polygonal shape similar to that of a nut.

[0016] According to this embodiment, the outer shape of the end portion of the area protruding from the surface of the steel plate in the cylindrical material is a polygonal shape (for example, a regular hexagon) similar to that of a nut. This allows the first nut to be rotated while this end portion is fixed with a tool such as a spanner or box wrench, preventing the first nut and the connecting component from rotating together when the first nut is rotated and tightened.

[0017] Furthermore, other embodiments of the joining structure between a wood member and other members according to the present invention are: The first nut is characterized in that a second nut, which has a third female thread on the outside of the first nut, is screwed onto the first male thread in the protruding region.

[0018] According to this embodiment, a double nut is formed by screwing a second nut onto the outside of the first nut on the first male screw, thereby suppressing rattling of the first nut.

[0019] In another aspect of the joining structure of the wood member and other members according to the present invention, The bolt includes a fixing region provided with a third male screw at an end side in the embedding direction into the wood member, and a plasticizing region between the fixing region and the steel plate. A steel pipe is embedded around the plasticizing region in the wood member.

[0020] According to this aspect, since the bolt has a plasticizing region in addition to the fixing region, when tensile or compressive forces act during an earthquake, the plasticizing region plasticizes, and it can have even higher earthquake energy absorption performance. Also, since a steel pipe is embedded around the plasticizing region of the bolt in the wood member, buckling of the bolt when a compressive force acts on the bolt can be restrained (prevented) by the steel pipe.

[0021] In another aspect of the joining structure of the wood member and other members according to the present invention, The bolt is either a lag screw bolt or a metal rod for GIR joint.

[0022] According to this aspect, since the bolt is either a lag screw bolt or a metal rod for GIR (Glued in Rod) joint, the steel plate of the steel other member and the wood member can be firmly joined at as few joining points as possible.

[0023] In another aspect of the joining structure of the wood member and other members according to the present invention, The other steel member is a base made of a shaped steel, and the wood member is a wooden column, a wooden wall column, or a wooden wall.

[0024] According to this aspect, a joining structure between a base made of a shaped steel and a wooden column (including a wooden wall column) or a wooden wall with excellent earthquake energy absorption performance can be formed.

[0025] In another aspect of the joining structure of the wood member and other members according to the present invention, The other steel member is a steel column made of shaped steel material, and the wooden member is a wooden beam.

[0026] According to this embodiment, a joint structure can be formed between a steel column made of shaped steel material and a wooden beam, which has excellent seismic energy absorption performance. [Effects of the Invention]

[0027] As can be understood from the above explanation, the present invention relates to a joint structure for a wooden member and another member in which the end of the wooden member is joined to a steel plate provided by the other steel member. The present invention provides a joint structure for a wooden member and another member in which the bolts connecting the steel plate and the wooden member can function against both tensile and compressive forces, while eliminating the need to process an opening in the wooden member or to close the opening with a wooden plug or the like. [Brief explanation of the drawing]

[0028] [Figure 1] These are a pair of front views of a joint structure between a wooden member and another member according to an embodiment. [Figure 2] This is an enlarged view of part II in Figure 1, showing the inside of the wooden member. [Figure 3] (a) is a perspective view of an example of a connecting component, and (b) is a view in the direction of arrow b in Figure 3(a). [Modes for carrying out the invention]

[0029] The joint structure between the wood member and other members according to the embodiment will be described below with reference to the attached drawings. In this specification and drawings, substantially identical components may be denoted by the same reference numerals to avoid redundant explanations.

[0030] [Joining structure between wood-based member and other members according to the embodiment] The joining structure of a wooden member and other members according to the embodiment will be described with reference to Figures 1 to 3. Here, Figure 1 is a pair of front views of the joining structure of a wooden member and other members according to the embodiment, and Figure 2 is an enlarged view of part II of Figure 1, showing the inside of the wooden member. Also, Figure 3(a) is a perspective view of an example of a connecting part, and Figure 3(b) is a view in the direction of arrow b in Figure 3(a).

[0031] The joint structure 100 shown in Figure 1 is a joint structure between the end face 12 (an example of an end) of a wooden wall column 10 (an example of a wooden member) whose wide surface 11 is long in the width direction, and the upper flange 22 (an example of a steel plate) of a base 20 (an example of another steel member) made of H-shaped steel. Here, the wooden member to which the joint structure is applied may be a general wooden column or wooden beam with a narrow width, and the other steel member may be a steel column made of shaped steel such as H-shaped steel.

[0032] In the joint structure 100, as shown in Figures 2 and 3, a steel connecting component 40 is used, which is inserted into and engages with a through hole 24 provided in the steel plate 22.

[0033] The connecting component 40 comprises a cylindrical member 41 having a first female thread 43 inside and a first male thread 42 on its outer circumference, and a flange 45 provided at one end of the cylindrical member 41 and protruding laterally. Furthermore, the other end of the cylindrical member 41 opposite to the flange 45 is provided with a polygonal portion 47 having a regular hexagonal outer shape similar to that of a general nut.

[0034] As shown in Figure 2, the cylindrical member 41 is inserted through the through hole 24 of the steel plate 22, the flange 45 is engaged with the upper surface 22a of the steel plate 22, and the cylindrical member 41 is made to protrude downward from the lower surface 22b (an example of a surface) of the steel plate 22, thereby forming a region 48 that protrudes from the lower surface 22b.

[0035] The connecting component 40 and the lag screw bolt 30 are joined by screwing the second male thread 36 on one end 31 of the lag screw bolt 30 (an example of a bolt) into the first female thread 43 of the cylindrical material 41. In the illustrated example, the second male thread 36 passes through the first female thread 43, and the two are screwed together with its lower end protruding downwards. Here, instead of the lag screw bolt in the illustrated example, a metal rod for GIR joining may be used.

[0036] An insertion hole (not shown) is machined into the wooden wall column 10, extending from its end grain surface 12 into the interior, and a lag screw bolt 30 is embedded in this insertion hole.

[0037] The lag screw bolt 30 has an anchoring region 32 in the embedding direction and a plastic deformation region 34. A third male thread 33 is provided on the outer circumference of the anchoring region 32, and a second male thread 36 is provided on one end 31 of the plastic deformation region 34.

[0038] Here, the outer diameter φ1 of the plastic deformation region 34 is set to be smaller than the outer diameter φ2 of the anchorage region 32, and it is a region that plasticizes before other regions due to the tensile force N1 and compressive force N2 acting during an earthquake, thereby absorbing earthquake energy.

[0039] Furthermore, a steel pipe 50 is embedded around the plastic deformation region 34 of the lag screw bolt 30 in the wooden wall column 10. The steel pipe 50 acts to restrain the buckling of the plastic deformation region 34 when a compressive force N2 is applied to the lag screw bolt 30.

[0040] In the fabrication of the joint structure 100, a lag screw bolt 30 is embedded in the end grain surface 12 of the wooden wall column 10, and a steel pipe 50 is embedded around it. Then, the lag screw bolt 30 and the connecting component 40 are joined by screwing the first female thread 43 of the connecting component 40 into the second male thread 36 of the lag screw bolt 30 protruding from the end grain surface 12.

[0041] Next, the cylindrical member 41 of the connecting part 40 is inserted through the through hole 24 of the steel plate 22, and the second female thread 62 of the first nut 60 is screwed onto the first male thread 42 of the cylindrical member 41 while rotating the first nut 60.

[0042] When rotating the first nut 60, the polygonal portion 47 at the end of the cylindrical material 41 is fixed with a tool such as a box-end wrench (not shown) while the first nut 60 is rotated, thereby preventing the first nut 60 and the connecting part 40 from rotating together when the first nut 60 is rotated and tightened.

[0043] By rotating and tightening the first nut 60, the flange 45 of the connecting part 40 and the first nut 60 sandwich the steel plate 22, and the lag screw bolt 30 is indirectly joined to the steel plate 22.

[0044] In this way, the lag screw bolt 30, which is joined to the connecting component 40, is joined to the steel plate 22 by sandwiching the steel plate 22 between the flange 45 and the first nut 60 of the connecting component 40. As a result, regardless of whether a tensile force N1 or a compressive force N2 is applied to the lag screw bolt 30, both the tensile strength and compressive strength of the lag screw bolt 30 will be exhibited.

[0045] In the illustrated example, the third female thread 72 of the second nut 70 is screwed onto the first male thread 42 of the protruding region 48 of the connecting component 40, with the third female thread 72 of the second nut 70 screwed onto the outside of the first nut 60, forming a double nut with the first nut 60 and the second nut 70.

[0046] This double nut design helps to suppress rattling of the first nut 60, which directly clamps the steel plate 22 together with the flange 45 of the connecting component 40.

[0047] According to the illustrated example of the joint structure 100 between the wooden member and another member, a steel connecting part 40 is engaged with a through hole 24 in the steel plate 22 of the other member 20, a second male thread 36 at one end of a bolt 30 is screwed into the first female thread 43 of the connecting part 40, and a first nut 60 is screwed onto the first male thread 42 of the connecting part 40 that protrudes from the lower surface 22b of the steel plate 22, thereby joining the connecting part 40 to the steel plate 22. As a result, the bolt 30, which is embedded in the wooden member 10 and joined to the steel plate 22 of the other member 20, can exert tensile and compressive resistance against both tensile force N1 and compressive force N2 acting on it, thereby forming a joint structure with excellent seismic energy absorption performance.

[0048] Furthermore, when forming the joint structure 100, it is unnecessary to process an opening in the wooden member 10 or to close the opening with a wooden plug or the like, thus avoiding the issues of processing time and construction time. Moreover, since the bolt 30 embedded in the wide surface 11 of the wooden member 10 is not visible, the aesthetic appearance of the wide surface 11 of the wooden member 10 is not impaired.

[0049] Furthermore, the presence of a plastic deformation region 34 in the bolt 30 further enhances the seismic energy absorption performance of the joint structure 100.

[0050] Furthermore, by embedding the steel pipe 50 in the wooden member 10 so as to surround the plastic deformation region 34 of the bolt 30, buckling caused by the compressive force N2 of the bolt 30 can be prevented (restrained), thereby increasing the durability of the bolt 30.

[0051] Furthermore, other embodiments may be used in which other components are combined with the configurations listed in the above embodiments, and the present invention is not limited in any way to the configurations shown herein. In this regard, modifications can be made without departing from the spirit of the present invention, and can be appropriately determined according to the application form. [Explanation of Symbols]

[0052] 10: Wooden structural members (wooden wall columns) 11: Wide surface 12: End surface (edge) 20: Other components (H-beams, foundation) 22: Steel plate (upper flange) 22a:Top surface 22b: Bottom surface (front surface) 24: Through hole 30: Bolt (Lag screw bolt) 31: One end 32: Fixation area 33: Third male screw 34: Plasticization region 36: Second male screw 40: Connecting parts 41: Tube material 42: First male screw 43: First female thread 45: Flange 47: Polygonal section (other end) 48: Protruding area 50: Steel pipe 60: First nut 62: Second female thread 70: Second nut 72: Third female thread 100: Joining structure between wooden members and other members (joint structure) N1: Tensile force N2: Compression force

Claims

1. A joining structure between a wooden member and another member, wherein the end of the wooden member is joined to a steel plate provided by another steel member, A steel connecting component is inserted into a through hole provided in the steel plate with the flange facing the wooden member, and the other end of the cylindrical member protruding from the surface of the steel plate. The cylindrical member has a first female thread inside and a first male thread on its outer circumference, and a flange provided at one end of the cylindrical member that protrudes laterally. A bolt having a second male thread at least on one end is embedded inside the wooden member, passing through the connecting part, and the second male thread is screwed into the first female thread. A joining structure for a wooden member and another member, characterized in that the flange and the first nut sandwich the steel plate, by screwing the second female thread of the first nut into the first male thread of the cylindrical member in the portion that protrudes from the surface of the steel plate.

2. The joining structure for a wooden member and another member according to claim 1, characterized in that the outer shape of the end of the protruding region in the cylindrical member is a polygonal shape similar to that of a nut.

3. The joining structure for a wooden member and another member according to claim 2, characterized in that a second nut, which has a third female thread on the outside of the first nut, is screwed onto the first male thread in the protruding region.

4. The bolt has a fixing region with a third male thread on the end side in the direction of embedding into the wooden member, and a plastic deformation region between the fixing region and the steel plate. The joining structure between a wood member and another member according to claim 3, characterized in that a steel pipe is embedded around the plastic deformation region in the wood member.

5. The joining structure for a wooden member and another member according to claim 4, characterized in that the bolt is either a lag screw bolt or a metal rod for GIR joining.

6. The joint structure for a wooden member and another member according to claim 1, characterized in that the other steel member is a base made of shaped steel, and the wooden member is a wooden column, a wooden wall column, or a wooden wall.

7. The joint structure for a wooden member and another member according to claim 1, characterized in that the other steel member is a steel column made of shaped steel material, and the wooden member is a wooden beam.

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