JP2007077611A - Wood member joining structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enlarge the amount of plastic deformation up to an ultimate state to improve safety of a structure or to enhance the initial rigidity of a joint part in addition and to reduce the amount of deformation under the action of load considered in design in a structure for joining a wood member to a member to be joined. <P>SOLUTION: A lower end of a wooden column 1 is provided with a cutout part 1a, and a screw member 11 is screwed in an axial direction from the inside of the cutout part. The screw member is provided with a hollow hole in the axial direction from an end face, and an internal thread is cut at a bottom part. A locknut 16 is screwed to the other end of a long bolt 13 inserted in the hollow hole so that the tip is screwed to the internal thread, thus sticking a joint fitting 14 to the screw member. The joint fitting is fixed to a foundation 3 by an anchor bolt 12 projected from the foundation 3, and a locknut 15 screwed to the anchor bolt 12. The long bolt 13 is put in an elastically elongated state beforehand, and it is preferable to fasten the nut beforehand so that its reaction is applied to the screw member. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a structure in which wooden members such as columns and beams in a wooden building and a member to be joined such as a similar wooden member or foundation are joined, and in particular, an embedded member made of metal is embedded in and fixed to the wooden member. Further, the present invention relates to a structure in which the embedded member and the member to be joined are joined via a joint fitting.

  In a wooden building, a pillar and a beam are proposed as a so-called rigid connection, that is, a connection in which a bending moment is transmitted, and a frame structure is proposed as a ramen structure. In such a structure, it is necessary to join the column and the beam, or the column and the foundation so that a bending moment can be transmitted. Moreover, a tensile force may act on a junction part.

As a structure for joining wooden members so that a bending moment and a tensile force can be transmitted as described above, for example, Patent Document 1 proposes the following joining structure.
In this joining structure, members having a rectangular cross section and a long side of about 3 to 5 times the short side are used as columns and beams, and these are joined. The column is joined with the upper surface of the beam in contact with the lower surface, and notches are provided at both ends in the long side direction at the lower end or upper end of the column, and two screws are provided from the notch in the axial direction of the column. The member is screwed. The screw member is provided with a spiral projecting portion on the side surface of a rod-shaped steel member, a bolt hole is formed in the axial direction from the end surface, and a female screw is cut on the inner peripheral surface. A joint fitting is mounted in each of the notches, and is coupled to the screw member by a bolt screwed into a bolt hole from the end surface of the screw member. On the other hand, two screw members are screwed into the corresponding positions of the beam in the vertical direction, and the upper surface or the lower surface of the column is in contact with the end surface of the column and is also in contact with the joint fitting. The joint fitting is also firmly coupled to the screw member screwed into the beam by the bolt screwed into the bolt hole formed on the end surface of the screw member screwed into the beam.
Japanese Patent Laid-Open No. 2004-143779

However, the above-described joint structure has a problem in which the following improvement is desired.
When a large horizontal force such as an earthquake acts on the structure, a large bending moment acts on the joint between the column and the beam of the rigid frame structure or the lower end of the pillar, that is, the joint between the column and the foundation. When a large bending moment is generated in the joint, a tensile force acts on the joint fitting and the bolt that joins the screw member and the joint fitting, and deformation occurs in the vertical direction. As the joining metal fitting, one having a large ultimate strength is used, and generally the ultimate state of the joining structure is when the bolt breaks. The bolt has a range in which the tensile stress is generated from the head of the bolt to the portion screwed into the screw member, and the length thereof is short, and the range in which elongation occurs at the end is small. For this reason, the amount of deformation occurring in the bolt in the final state is reduced.

In general, it is known that a structure has a sticky and strong structure when the amount of deformation in the final state, that is, plastic deformation is large. In particular, an indefinite structure such as a rigid frame structure, where each part of the structure allows large plastic deformation, when a large load acts and plastic deformation occurs in a part of the structural body, Moment redistribution occurs, and the strength to ultimate destruction is improved. Further, when a repeated load (vibration) is applied as in an earthquake, kinetic energy is absorbed by plastic deformation, and the vibration is attenuated to improve safety against ultimate failure.
Therefore, it is desired to increase the amount of deformation until the ultimate failure at the joint between the column and the beam, and to improve the ultimate strength of the structure.

  On the other hand, when a small load, that is, a load acting on the structural member is sufficiently safe, it is desirable to keep the deformation amount of the joint portion small. Regarding the relationship between the load and deformation in the initial state of load loading, it is desired that the amount of deformation is as small as possible and the rigidity is large. If the rigidity is small, the structural frame will be easily deformed and will be easily shaken even in a small earthquake.

  The present invention has been made in view of the above circumstances, and its purpose is to increase the amount of plastic deformation up to the final state in a structure in which a wooden member is joined to a member to be joined, and the safety of the structure. In addition to this, in addition to this, the initial rigidity of the joint portion is increased, and the deformation amount is suppressed to be small in a state where a load that is considered in design is applied to the structure.

  In order to solve the above-mentioned problems, the invention according to claim 1 is a joining structure of a wooden member and another member to be joined, wherein the wooden member has a rod-like embedded member made of metal, Embedded in and fixed to almost the entire length of the embedded member, and a joining bracket is fixed to contact with the end face of the embedded member, and the joined bracket is fixed to the member to be joined, A hollow hole is provided in an axial direction from an end face to which the joint fitting is fixed, and a tip of a long bolt inserted into the hollow hole from the end face is locked to the embedded member, and an intermediate part of the long bolt Has a smaller diameter than the inner diameter of the hollow hole, a fastening nut screwed to the other end of the long bolt is locked to the joint fitting, and is tightened to secure the joint fitting to the embedded member. Member joining To provide an elephant.

In this joining structure, a tensile force acts on the long bolt when a force to separate between the wood member joined by the joint fitting and the member to be joined is applied. Considering the final state of the joint structure, it can be set so that the long bolt breaks and the joint structure is broken when the tensile force of the long bolt becomes larger than the ultimate strength.
One end of the long bolt is locked to the joint fitting, and the other end is inserted into the hollow hole of the embedded member and locked. The middle portion of the long bolt is allowed to expand and contract in the hollow hole of the embedded member. It is in a state. Therefore, when the force which separates between a wooden member and a to-be-joined member acts as mentioned above, tensile force acts on a long volt | bolt over substantially full length. When the tensile stress of the long bolt reaches the yield point and further undergoes plastic deformation and breaks, plastic deformation occurs in a wide range in the length direction, and the amount of deformation until the final break increases. As the deformation amount of the long bolt increases as described above, the plastic deformation amount until the ultimate fracture of the joint structure also increases. Therefore, in a structure employing such a joint structure, redistribution of a cross-sectional force such as a bending moment occurs until a large load acts and breaks, and the ultimate strength is improved. Further, when a repeated load is applied during an earthquake or the like, the vibration energy is absorbed by plastic deformation, and the vibration of the structure is attenuated by a so-called seismic control action, thereby suppressing an increase in shaking.

  On the other hand, the tensile force acting on the long bolt is transmitted to the embedded member at a position locked with the embedded member, and acts as a force in the direction of pulling out the embedded member. As shown in FIG. 16, this force is transmitted from the outer peripheral surface of the embedded member to the wooden member. Therefore, a compressive force acts on the embedded member on the drawing side from the position where the long bolt is locked, and a tensile force acts on the tip side from the position where the long bolt is locked. In this way, by inserting and locking the long bolt into the hollow hole, the tensile force generated in the embedded member is significantly reduced compared to the structure in which the bolt is screwed to the end of the embedded member in the conventional joint structure. To do. Thereby, it becomes possible to use a casting etc. for an embedding member, and it becomes possible to reduce manufacturing cost.

  In this connection structure, it is desirable to design so that the destruction in the final state occurs with a long bolt, and the diameter, material, etc. of the long bolt are appropriately selected according to the size, rigidity, strength, etc. of the member to be bonded. be able to. Thereby, the destruction pattern in the final state can be controlled, and a safer design becomes possible.

  The invention according to claim 2 is the wood member joining structure according to claim 1, wherein the embedded member is a screw member having a spiral projecting portion on an outer peripheral surface, and is screwed into the wood member to form the projecting portion. Is integrated with the wooden member.

  The screw member is screwed into a hole drilled in advance in the wood member, whereby the projecting portion of the outer peripheral surface is engaged with the wood member and firmly integrated. Therefore, even if a force acts in the direction of pulling out the screw member via the joining metal fitting and the long bolt, it strongly resists.

  The invention according to claim 3 is the wood member joint structure according to claim 1, wherein the embedded member is inserted into a hole drilled in the wooden member, and an outer peripheral surface of the embedded member and an inner peripheral surface of the hole And an adhesive filled between them.

  The embedded member is firmly integrated with the wooden member by an adhesive, and can sufficiently resist the force in the direction of being pulled out from the wooden member.

  According to a fourth aspect of the present invention, in the wood member joining structure according to the first aspect, a female screw is cut at a bottom portion of the hollow hole, and a tip portion of the long bolt is screwed into the female screw. .

  In this joining structure, when manufacturing the long bolt and the embedded member, the length of the long bolt and the depth of the hollow hole provided in the embedded member can be arbitrarily set, and when the tensile force acts on the long bolt The length can be set to an appropriate length assuming the amount of elongation in the elastic region and the amount of elongation in the plastic region.

  The invention according to claim 5 is the wood member joining structure according to claim 1, wherein the hollow hole penetrates from the end face to which the joining fitting of the embedded member is fixed to the opposite end face, It is assumed that a female screw is cut in the vicinity of the opposite end surface, and the long bolt is screwed into the female screw at the tip.

  In the embedded member in this joining structure, the hollow hole penetrates in the axial direction, and the tip of the long bolt is screwed to the end opposite to the end to which the fitting is fixed, so the long bolt is screwed. Therefore, the internal thread can be cut from a nearby end face, and the processing becomes easy. Further, when a tensile force acts on the long bolt, a compressive force acts on almost the entire length of the embedded member.

  The invention according to claim 6 is the wood member joining structure according to claim 1, wherein the hollow hole penetrates from the end face to which the joining metal fitting of the embedded member is fixed to the opposite end face, The long bolt is inserted through the hollow hole, and a fixing nut screwed into the tip is brought into contact with and locked to the opposite end surface of the embedded member.

  In this joining structure, since the long bolt is locked to the embedded member by a nut screwed to the tip, it is not necessary to cut a female screw in the embedded member, and the processing of the embedded member is facilitated and the manufacturing cost is reduced. can do.

  The invention according to claim 7 is the wood member joint structure according to claim 4 or 5, wherein an intermediate nut is screwed into an end portion of the long bolt that is locked to the joint metal fitting, It is assumed that an intermediate nut is in contact with the end face of the embedded member, and a part of the joint metal is sandwiched between the intermediate nut and the tightening nut and the joint metal is fixed.

When a force to be pulled apart acts between the wood member 1 and the member 2 to be joined, and a force acts in the pulling direction of the long bolt 13 from the joint fitting 14, as shown in FIG. The generated long bolt 13 is pulled out from the hollow hole of the embedded member 11, but a part of the joint fitting 14 is maintained between the intermediate nut 17 and the tightening nut 16. Then, after plastic deformation occurs in the long bolt 13, the direction of the load is reversed and a force for pressing between the wooden member 1 and the member to be joined 2 is applied, whereby the joining metal 14 is engaged with the intermediate nut 17. It stops and causes the long bolt 13 to generate a compressive stress. On the other hand, if the intermediate nut 17 is not used, as shown in FIG. 17B, the joining fitting 14 returns to the original position while the plastic deformation of the long bolt 13 remains.
As described above, after the plastic deformation to the tension side occurs in the long bolt 13, when the direction of the load is reversed, the long bolt 13 also causes plastic deformation on the compression side, and repeats like an earthquake load. When a load whose direction is reversed is applied, a hysteresis curve is drawn so that the relationship between force and displacement is large. Thereby, the effect that a member absorbs kinetic energy and controls vibration arises.

  The invention according to claim 8 is the wood member joint structure according to any one of claims 1 to 6, wherein both ends of the long bolt are embedded in a state where elastic elongation occurs in an axial direction. It is locked to a member or the joint fitting, and a compressive force is introduced into the embedded member by a reaction force from the long bolt.

  In this joining structure, a tensile force is introduced to the long bolt in advance, and acts to press the joining fitting against the embedded member. Therefore, when a force to pull apart acts between the wooden member and the member to be joined, and when a force acts in the pulling direction of the long bolt from the joining bracket, the force is applied between the joining bracket and the end surface of the embedded member. The long bolt is not pulled out from the hollow hole of the embedding member until the acting compressive force is exceeded. For this reason, the amount of displacement between the joined wood member and the member to be joined is suppressed to be small at the initial stage of loading, and the rigidity of the joined portion is increased. Therefore, the rigidity of the structure to which the members are joined in this way is increased, and the amount of deformation under a load that is considered in design is small, and a structure that does not easily shake can be obtained.

  The invention according to claim 9 is the wood member joining structure according to any one of claims 1 to 6, wherein an intermediate nut is screwed at an end portion of the long bolt that is engaged with the joining bracket. The intermediate nut is brought into contact with the end face of the embedded member in a state where the long bolt is elastically stretched in the axial direction, and the joint metal fitting is interposed between the intermediate nut and the tightening nut. It is assumed that the joining metal fitting is fixed by sandwiching a part thereof.

  The invention according to claim 10 is the wood member joining structure according to claim 9, wherein the embedded member inserts the long bolt into the hollow hole and locks the tip, and the long bolt is axially connected. It is assumed that the intermediate nut is brought into contact with the end face of the embedded member and is embedded in the wooden member in a state where elastic elongation occurs.

  In this joint structure, the intermediate nut is screwed to the long bolt between the embedded member and the joint bracket. Therefore, before attaching the joint bracket to the embedded member, the intermediate nut is tightened to introduce a tensile force to the long bolt. can do. That is, at the factory or the like, the tip of the long bolt can be fixed to the embedded member, and the intermediate nut can be tightened in a state where the tensile force is introduced and the elongation occurs, so that the intermediate nut is pressed against the end surface of the embedded member. And it can embed in a wooden member in this state.

  When the embedded member into which the long bolt is inserted as described above is embedded in the wooden member and the joining bracket is fixed so as to come into contact with the intermediate nut, when a force acts in the direction of pulling the joining bracket away from the implantation member, The long bolt is not pulled out from the hollow hole of the embedded member until the force exceeds the pressure contact force between the intermediate nut and the embedded member. Therefore, the amount of displacement between the joint fitting and the embedded member is reduced, and the rigidity of the joint is increased.

  In addition, when a force in the direction of bringing the wooden member and the member to be joined closer to each other at the joint, that is, a compressive force, an intermediate nut is inserted as compared with the case where the end surface of the embedded member is in direct contact with the joint fitting. As a result, the contact surface becomes larger, and the pressure contact surface becomes flat and the two come into close contact with each other. Therefore, when compressive force is transmitted from the embedded member to the joint fitting, the force is not concentrated on the local area, and safety against destruction of the joint fitting is improved.

  The invention according to claim 11 is the wood member joint structure according to any one of claims 1 to 7, wherein the wood member is a column having a rectangular cross section, and a long side direction at an end of the wood member Cutouts are provided at both ends of the column, the embedded member is embedded in the axial direction of the column from within the cutout, the joint fitting is fixed in the cutout, and the end surface of the column is It shall be joined facing the horizontal surface of the joining member.

  In this joint structure, the cross section of the column is a flat rectangle, and both end portions in the long side direction are connected by the embedded member and the joint fitting, so that the bending moment acting in the long side direction is not affected. The structure can effectively resist. In addition, since the joining metal fittings are provided only at both ends, the structure can effectively transmit the axial force and bending moment of the column with a simple structure.

As described above, the wood member joining structure according to the present invention increases the amount of plastic deformation until reaching the final state when a force is applied to separate the wood member and the member to be joined. The toughness of the structure by the joined members can be increased and a tenacious structure can be obtained. In particular, when joining the upper or lower end of a column member to a beam or foundation, if two points in the cross section of the column are joined by this joint structure, the upper or lower end of the column is joined so that a bending moment can be transmitted. be able to. And the amount of plastic deformation of this junction part can be increased, and the safety | security with respect to an ultimate state can be improved.
In addition, by introducing a tensile force in advance to the long bolt that joins the embedded member and the joint bracket, the initial rigidity of the joint is increased, and deformation and shaking with respect to the load acting on the structure under normal use conditions are reduced. be able to.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic perspective view showing a structural frame of a wooden building in which the wood member joining structure of the present invention is suitably used.
This structural frame is composed of a rigid frame structure in which a wooden column 1 and a wooden beam 2 are joined together so that a bending moment can be transmitted. Yes. Each ramen frame has a so-called beam-winning structure in which a wooden beam 2 is placed on a wooden column 1 and joined. The column 1 and the beam 2 constituting each ramen frame are these The cross-sectional dimension in the direction parallel to the vertical plane including the axis of the above is increased, and the cross-sectional dimension in the direction perpendicular thereto is decreased to provide a flat member. Therefore, the joint portion of each frame structure has a structure that resists bending in one direction.

FIG. 2 is an exploded perspective view showing an embodiment of the invention according to the present application, which is a joint structure between the foundation 3 and the pillar 1 used in the structural housing shown in FIG. FIG. 3 is a cross-sectional view of the same joint structure, showing a cross section parallel to the axis of the rigid frame structure.
In this joint structure, notches 1a are provided at both ends in the long side direction on the lower end surface of the pillar 1, and two embedded members, that is, screw members 11, are screwed in from the notch 1a in the axial direction of the pillar. It is. And the joining metal fitting 14 is attached to the notch 1a, and the joining metal fitting 14 is constituted by a long bolt 13 screwed in the axial direction of the screw member 11 and a tightening nut 16 screwed into the long bolt. It is fixed to the screw member 11.

  On the other hand, in the foundation 3, vertical anchor bolts 12 are embedded at positions corresponding to the positions where the column screw members 11 are screwed, and the head protrudes from the upper surface of the foundation 3. The joining bracket 14 is fixed to the foundation 3 by a fastening nut 15 screwed to the anchor bolt 12. Thereby, the foundation 3 and the pillar 1 are joined via the anchor bolt 12, the joint fitting 14, the long bolt 13, and the screw member 11.

As shown in the front view and the cross-sectional view of FIG. 4, the screw member 11 is provided with a spiral projecting portion 11a on the side surface of a rod-shaped steel member. The overhanging portion 11a engages with the wooden member while being screwed into the wooden member, and forces are transmitted between the screw member 11 in the axial direction and in the direction perpendicular to the axial line. A hollow hole 11b is provided in the axial direction from the end face of the screw member 11, and a female screw 11c is cut at the bottom of the hollow hole 11b. The female screw 11c is a screw into which the tip of the long bolt 13 inserted into the hollow hole 11b is screwed.
The screw member 11 may be formed by cutting a rod-shaped steel material to form a spiral projecting portion 11a. Alternatively, a screw member having a projecting portion may be formed by casting.

  As shown in FIG. 2 or 3, the long bolt 13 has male screws 13a and 13b cut at both ends, and one end is inserted into the hollow hole 11b of the screw member 11 and screwed into the female screw 11c at the bottom. It is what is done. The other end is screwed with a tightening nut 16 and is locked to the joint fitting 14. The outer diameter of the intermediate portion 13c is smaller than the inner diameter of the hollow hole 11b of the screw member, so that deformation is not constrained in the hollow hole 11b of the screw member.

  The long bolt 13 is desirably formed of a material having a large amount of plastic deformation until breakage, such as mild steel, and a material, a diameter, and the like are appropriately selected depending on a use site of the structure, dimensions of members constituting the structure, and the like. be able to.

  When the joining bracket 14 is fixed to the screw member 11 by the tightening nut 16 engaged with the long bolt 13, the joining bracket 14 is tightened so as to be in close contact with the end surface of the screw member 11. The joint fitting 14 may be fixed in a state where a large tensile force is applied to cause elastic elongation deformation. In such a tightened state, a large pressure contact force acts in advance between the end surface of the screw member 11 and the upper surface of the joining metal fitting 14.

  As shown in FIGS. 5 and 6, the joint fitting 14 includes two horizontal plate portions 31 and 32 that face each other and a side plate portion 33 that connects them, and the side plate portions are the horizontal plate portions 31 and 32. These horizontal plate portions are provided so as to be opened at a part along the peripheral edge. The two horizontal plate portions 31 and 32 are in contact with the end surface of the screw member 11 screwed into the column 1 and the foundation 3, respectively. The upper horizontal plate 33 is provided with a bolt hole 34 through which the lower end of the long bolt is inserted. A circular hole 35 having a diameter larger than that of the bolt hole 34 is formed in the lower horizontal plate portion 1c. A circular plate 36 is engaged with the circular hole 35 from the inside, and a part in the thickness direction is fitted into the circular hole so as to be able to rotate in the circumferential direction. The circular push plate 36 is provided with a long hole 37 having an axial line in the radial direction from the center, and an anchor bolt protruding from the foundation 3 is inserted into the long hole.

  The circular plate 36 rotates in the circumferential direction in a state where a part thereof is fitted in the circular hole 35, and the direction of the long hole 37 provided in the radial direction from the center can be freely adjusted. Therefore, even if there is an error in the position of the anchor bolt 12, the anchor bolt 12 can be inserted into the elongated hole 37 correspondingly, and the tightening nut 15 screwed to the anchor bolt 12 can be inserted through the circular plate 36. Thus, the joining metal fitting 14 can be fixed to the foundation 3.

  In order to control the amount of deformation at the time of ultimate fracture of the joint structure, it is desirable to set the fracture so as to be caused by the breakage of the long bolt, and the member so that the joint fitting 14 has sufficient strength and rigidity. It is desirable to set the thickness and select the material.

FIG. 7 is a schematic view showing a state when a large horizontal force H is applied to the pillar 1 erected on the foundation 3 by the above-described joint structure.
For example, when a large horizontal force acts on the upper part of the column 1 as in an earthquake, a large bending moment is generated at the lower end of the column 1, a compressive force is applied to one side edge at the lower end of the column, and a tensile force is applied to the other. Force acts.

  On the side where the tensile force is generated, the tensile force is transmitted from the screw member 11 screwed into the column 1 to the joint fitting 14 via the long bolt 13. And the joining metal fitting 14 is restrained by the anchor bolt 12, and resists the tensile force produced in the side edge part of the pillar 1. FIG. At this time, a tensile force acts on the long bolt 13 between one end 13a screwed to the screw member 11 and the other end 13b screwed to the tightening nut 16 to cause elongation deformation. As the tensile force of the long bolt 13 increases, the long bolt 13 is pulled out from the hollow hole 11b of the screw member, and deformation occurs between the column 1 and the foundation 3. When the tensile stress of the long bolt 13 exceeds the yield point, plastic deformation occurs in a wide range in the length direction of the long bolt 13, and the end surface of the screw member 11 is separated from the upper surface of the joint fitting 14 and deformed between the column and the foundation. The amount increases. However, the column 1 and the foundation 3 resist the bending moment in a state where plastic deformation occurs, and the large deformation occurs until a state where ultimate failure occurs.

When the long bolt 13 is tightened in a state where a tensile force has been generated in advance, a pressure contact force acts as a reaction force of the tensile force between the screw member 11 and the joint fitting 14 due to the reaction force. In this state, when a force for pulling the column 1 and the screw member 11 screwed into the column 1 upward is generated, the pressure contact force between the screw member 11 and the joint fitting 14 is reduced, and the pressure contact force disappears. The long bolt 13 is pulled out from the hollow hole of the screw member 11, and the end surface of the screw member 11 is separated from the joint fitting 14, so that the deformation greatly increases. Therefore, when the applied horizontal force is small, the end face of the screw member 11 and the joint fitting 14 are kept in close contact with each other, and the amount of deformation becomes small and the rigidity when the load is small, that is, the initial rigidity increases. That is, the amount of deformation and shaking with respect to the initial load are reduced.
On the other hand, on the side where the compressive force is generated at the lower end surface of the column 1, the compressive force is transmitted from the screw member 11 to the joint fitting 14 that abuts on the screw member 11 and supported by the foundation 3 via the side plate portion 33 of the joint fitting 14. .

FIG. 8 is a cross-sectional view showing another embodiment of the invention according to the present application, which is a joint structure between the foundation 3 and the pillar 1 that can be used in the structural housing shown in FIG.
This joining structure joins the pillar 1 processed in the same manner as the joining structure shown in FIG. 3 and the foundation 3 in which the anchor bolts 42 are similarly embedded, and uses the same joining fitting 44. However, the screw member 41 screwed into the column 1 has a hollow hole penetrating from one end face to the other end face, and a female screw is formed near one end face. The long bolts 43 used are substantially the same length as the screw members 41 or longer than the screw members 41.

  The long bolt 43 is inserted into the hollow hole of the screw member 41 screwed into the wooden column 1 from the end surface side of the column, and the tip is cut near the end surface on the opposite side of the screw member 41 and screw. Combined. Thereby, the front-end | tip part of the long volt | bolt 43 is latched by the screw member 41, and the edge part on the opposite side protrudes from the screw member 41. FIG. A nut 46 is screwed to the long bolt 43 in the same manner as the joining structure shown in FIG. Further, the joining metal fitting 44 is joined to the foundation 3 by the anchor bolt 42 and the tightening nut 45 in the same manner as the joining structure shown in FIG.

Even in such a joint structure, when a large bending moment is generated at the lower end portion of the column 1 and bending deformation occurs, a tensile force is generated over almost the entire length of the long bolt 43, and the joint portion between the column 1 and the foundation 3 is finally formed. When breaking, plastic deformation occurs in a wide range of the long bolt 43, and the amount of deformation until the joint between the column 1 and the foundation 3 is broken increases.
Moreover, the hollow hole provided in the screw member 41 has penetrated from one end surface to the opposite end surface, and the process which cuts the internal thread for latching the long volt | bolt 43 can be performed easily.

  As shown in FIG. 9, a screw member having a hollow hole penetrating with a uniform inner diameter is used, and the tip of the long bolt 53 is fixed to the long bolt 53 via a washer 58. It may be locked by the nut 57. By setting it as such a structure, the process of the screw member 51 becomes easy and manufacturing cost can further be reduced.

FIG. 10 is a cross-sectional view showing another embodiment of the present invention, which is a joint structure that can be used in the joint portion between the column 1 and the foundation 3 used in the structural housing shown in FIG.
In this joining structure, the same screw member 51, long bolt 53, fixing nut 57 washer 58 and joining fitting 54 as those used in the joining structure shown in FIG. 9 are used. An intermediate nut 59 is used between 54 and 54. The intermediate nut 59 is locked to the screw member 51 in a state where a tensile force is introduced to the long bolt 53 between the intermediate nut 59 and the fixing nut 57 on the opposite side of the screw member 51. That is, as a reaction force of the tensile force acting on the long bolt 53, the fixing nut 57 and the intermediate nut 59 are pressed against the end surface of the screw member 51, and a compressive force is introduced into the screw member 51 over the entire length. The joining fitting 54 is in contact with the intermediate nut 59 and is fixed to the screw member 51 by a tightening nut 56 screwed together.

In the joining structure, the pillar 1 and the foundation 3 are joined by the following process.
Before the screw member 51 is screwed into the wooden pillar 1, a long bolt 53 is inserted in advance, and a fixing nut 57 and an intermediate nut 59 are screwed to both ends. Then, a tensile force is introduced into the long bolt 53, and the intermediate nut 59 or the fixing nut 57 is tightened in a state where elastic elongation occurs, and a compression force is generated in the screw member 51. The screw member 51 is screwed into a hole drilled in the wooden column 1 with the long bolt 53 inserted, and the long bolt 53 protruding from the intermediate nut 59 protrudes from the surface in the notch 1a of the column. The projecting long bolt 53 is inserted into the bolt hole 34 of the joint metal 54, and the joint metal 54 is fixed to the screw member 51 by the tightening nut 56.

  The pillar 1 to which the joining fitting 54 is fixed is lifted and conveyed to a position where it is built, and the anchor bolt 52 is inserted into the long hole 37 of the joining fitting 54 and is erected at a predetermined position. A fastening nut 55 is screwed onto the anchor bolt 52 and tightened to fasten the joining fitting 54 to the foundation 3, and the foundation 3 and the wooden column 1 are joined via the joining fitting 54.

As described above, the column 1 joined to the foundation 3 has a force to lift the column 1 upward together with the upper ends of the screw member 51 and the long bolt 53 on the tension side when a bending moment is generated at the lower end. Works. On the other hand, the lower end portion of the long bolt 53 and the intermediate nut 59 screwed together are constrained to the foundation 3 via the joint fitting 54. Therefore, although the long bolt 53 is stretched by the force to be lifted upward, a pressure contact force acts between the intermediate nut 59 and the end surface of the screw member 51, and the pressure contact force disappears due to the lift force. Until then, the elongation amount of the long bolt 53 is very small, and the deformation of the joint portion is small. Then, after the pressure contact force disappears, the elongation of the long bolt 53 increases, and the end portion is pulled out from the hollow hole of the screw member 51. Further, when a large bending moment acts, plastic deformation occurs in a wide range in the length direction of the long bolt 53, and a large amount of deformation until the ultimate failure is secured.
Therefore, in the joining structure as described above, the initial rigidity can be increased to suppress the deformation with respect to the initial load, and the amount of deformation until the ultimate failure can be increased to improve the safety against the failure.

As shown in FIGS. 11 and 12, the intermediate nut 59 has the long bolts 16 and 46 cut into the screw members 11 and 41 in the same manner as the joint structure shown in FIG. 3 or the joint structure shown in FIG. Also when it is screwed with the female screw, it can be used by being interposed between the screw members 11 and 41 and the joint fittings 14 and 44.
In addition, the joint structure shown in FIGS. 11 and 12 has the following effects in addition to the effect of suppressing the deformation amount at the initial stage of loading, similarly to the joint structure shown in FIG.
When a large bending moment acting on the lower end portion of the column 1 during an earthquake causes a tensile stress on the long bolts 13 and 43 and a bending moment in the opposite direction occurs after plastic deformation, as shown in FIG. In addition, the joint 14 is maintained in a state where it is sandwiched between the intermediate nut 17 and the tightening nut 16 and causes the long bolt 13 to generate a compressive stress. In other words, the long bolt 13 whose tip is fixed by being screwed into the female screw acts to be pushed into the hollow hole. Then, plastic deformation occurs in the compression direction, and the joint fitting 14 returns to the original position, and further deformation occurs, and a tensile force is generated in the long bolt 13 used on the opposite side of the column cross section. When the tensile force acting on the long bolt 13 exceeds the yield point, plastic deformation occurs. When such deformation is repeated due to vibration during an earthquake, the relationship between the deformation of the joint and the bending moment draws a hysteresis curve as shown in FIG.

  On the other hand, when the intermediate nut is not used, as shown in FIG. 17B, the plastic deformation of the long bolt 13 in which the plastic deformation has occurred remains, and the joining bracket 14 returns to the original position while remaining. In this range, deformation occurs without resisting the bending moment in the opposite direction. Therefore, the hysteresis curve has a shape as shown in FIG. The history curve shown in FIG. 18A is larger in the range surrounded by these curves than the history curve shown in FIG. That is, since the intermediate nut 17 is screwed to the long bolt 13, the amount of energy absorbed by the plastic deformation of the long bolt 13 is increased, and the vibration energy during the earthquake is absorbed to attenuate the vibration. It is.

  In addition, the effect of suppressing the vibration at the time of an earthquake as described above is that long bolts can be used if the intermediate nuts 17 and 47 are screwed together so as to sandwich the fittings 14 and 44 between the fastening nuts 16 and 46. 13 and 43 do not need to be locked in a state in which the extension is generated between the tip portion screwed into the female screw and the intermediate nuts 17 and 47.

FIG. 13 is a cross-sectional view showing an example in which the joint structure according to the present application is used for joining the column 1 and the beam 2 of the rigid frame structure shown in FIG. 1, showing a cross section parallel to the axis of the rigid frame structure. It is.
In this joining structure, notches 1b are provided at both ends in the long side direction on the upper end surface of the pillar 1, and a screw member 61 is screwed in the axial direction of the pillar 1 from the notch 1b. As the screw member 61, the long bolt 63, the tightening nut 66, and the joint fitting 64, the same joint structure as shown in FIG. 10 is used.
A screw member 71 for the beam is screwed into the beam 2 at a position corresponding to the screw member 61 screwed into the column 1, and a screw hole is formed in the screw member 71 in the axial direction from the end surface. Yes. An internal thread is cut on the inner peripheral surface, and a joint fitting 64 is fixed to a screw member 71 screwed into the beam 2 by a bolt 72 screwed into the internal thread.

  Even in such a joining structure, as in the case of joining the column 1 and the foundation 3, the amount of plastic deformation until the ultimate failure can be increased, and the safety of the rigid frame structure can be improved. Further, the screw members 11, 41, 51 and the long bolts 13, 43, 53, etc. used in the joint structure shown in FIG. 3, FIG. 8, FIG. 9, FIG. Similarly, it is possible to increase the amount of plastic deformation until the ultimate failure and increase the initial rigidity. Also, these screw members 11, 41, 51 and long bolts 13, 43, 53, etc. can be used by being screwed into the beam.

In the joining structure described above, a screw member having a spiral projecting portion on the peripheral surface of a metal rod-like material is used as the embedded member. However, in any joining structure, the screw member is used instead. It is possible to use an embedding member that is integrated with a wooden member with an adhesive.
The embedding members 81 and 82 are, for example, rod-shaped members having a circular cross section made of metal as shown in FIG. 14 or FIG. A plurality are provided. The convex portion is not limited to a node shape, and may have various shapes as long as it meets the purpose, such as a spiral shape or an independent mountain shape. Moreover, you may provide a recessed part.
The embedding members 81 and 82 are inserted into holes formed in the wooden pillar 1, and an adhesive is injected from the injection port 90 to be solidified. As a result, the pillar 1 and the embedded members 81 and 82 are integrally fixed, and resists a force for pulling out the embedded members 81 and 82.
The embedded members 81 and 82 can employ any type of hollow hole employed in the above-described screw member. In accordance with this, the same long bolts 83 and 84, a tightening nut 85, an intermediate nut are used. 86 and the fixing nut 87 can be used to connect to the similar joint fitting 88.

It is a schematic perspective view which shows the structural frame of the wooden building in which the joining structure concerning this invention is used suitably. It is a disassembled perspective view which shows the joining structure which is one Embodiment of the invention which concerns on this application. It is sectional drawing which shows the joining structure shown in FIG. 2, and shows a cross section parallel to the axis line of a rigid frame structure. It is the front view and sectional drawing of a screw member used with the joining structure shown in FIG.2 and FIG.3. It is a perspective view of the joining metal fitting used with the joining structure shown in FIG.2 and FIG.3. FIG. 6 is a top view, a bottom view, and a cross-sectional view of the joining metal fitting shown in FIG. 5. It is the schematic which shows the deformation | transformation state of the pillar joined with the foundation with the junction structure shown in FIG.2 and FIG.3. It is sectional drawing which shows the junction structure which is other embodiment of the invention which concerns on this application. It is sectional drawing which shows the junction structure which is other embodiment of the invention which concerns on this application. It is sectional drawing which shows the junction structure which is other embodiment of the invention which concerns on this application. It is sectional drawing which shows the junction structure which is other embodiment of the invention which concerns on this application. It is sectional drawing which shows the junction structure which is other embodiment of the invention which concerns on this application. It is other embodiment of the invention which concerns on this application, Comprising: It is sectional drawing which shows the junction structure of a column and a beam. It is sectional drawing which shows the junction structure which is other embodiment of the invention which concerns on this application. It is sectional drawing which shows the junction structure which is other embodiment of the invention which concerns on this application. It is the schematic which shows the state of the stress which acts on the embedding member screwed into the column. It is a schematic sectional drawing which shows a state when the repeated load at the time of an earthquake acts on the joining structure which concerns on this invention. It is a figure which shows the hysteresis curve of the relationship between a cross-sectional force and a displacement in the joining structure which concerns on this invention.

Explanation of symbols

1: pillar, 1a, 1b: notch, 2: beam, 3: foundation,
11: Screw member, 11a: Overhang portion, 11b: Hollow hole, 11c: Female screw, 12: Anchor bolt, 13: Long bolt, 14: Joining bracket, 15, 16: Clamping nut,
31: Upper horizontal plate portion, 32: Lower horizontal plate portion, 33: Side plate portion, 34: Bolt hole, 35: Circular hole, 36: Circular plate, 37: Long hole,
41: Screw member, 42: Anchor bolt, 43: Long bolt, 44: Joint fitting, 45, 46: Clamping nut,
51: Screw member, 52: Anchor bolt, 53: Long bolt, 54: Joint fitting, 55, 56: Clamping nut, 57: Fixing nut, 58: Washer, 59: Intermediate nut,
61: Screw member, 63: Long bolt, 64: Joint fitting, 66: Clamping nut, 67: Fixing nut, 68: Intermediate nut,
71: Screw member, 72: Bolt,
81, 82: Embedded member, 81a, 82a: Projection, 83, 84: Long bolt, 85: Clamping nut, 86: Intermediate nut, 87: Fixing nut, 88: Joint fitting

Claims (11)

A joining structure of a wooden member and another member to be joined,
In the wooden member, a rod-shaped embedded member made of metal is embedded and fixed over almost the entire length of the embedded member,
The joining bracket is fixed in contact with the end surface of the embedded member, and the joining bracket is fixed to the member to be joined,
In the shaft portion of the embedded member, a hollow hole is provided in the axial direction from the end surface to which the joint fitting is fixed,
The tip of the long bolt inserted into the hollow hole from the end face is locked to the embedding member, and the middle part of the long bolt has a smaller diameter than the inner diameter of the hollow hole,
A wood member joining structure characterized in that a fastening nut screwed to the other end of the long bolt is locked to the joint fitting and fastened to secure the joint fitting to the embedded member.   The embedded member is a screw member having a spiral projecting portion on an outer peripheral surface, and is screwed into a wooden member so that the projecting portion engages with the wooden member and is integrated. The wood member joining structure according to claim 1.   The embedded member is inserted into a hole formed in the wood member, and is integrated by an adhesive filled between the outer peripheral surface of the embedded member and the inner peripheral surface of the hole. The wood member joint structure according to claim 1.   2. The wood member joining structure according to claim 1, wherein a female screw is cut at a bottom portion of the hollow hole, and a tip of the long bolt is screwed into the female screw.   The hollow hole penetrates from the end face to which the joint fitting is fixed to the opposite end face, a female screw is cut in the vicinity of the opposite end face, and the long bolt is screwed into the female screw at the tip. The wood member joining structure according to claim 1, wherein the wood member joining structure is a thing. The hollow hole penetrates from the end face to which the joining fitting is fixed to the opposite end face,
2. The wood according to claim 1, wherein the long bolt is inserted into the hollow hole, and a fixing nut screwed into a tip end portion is in contact with and locked to an end surface on the opposite side of the embedded member. Member joint structure.   An intermediate nut is screwed into an end portion of the long bolt that is locked to the joint fitting, and the intermediate nut is in contact with an end surface of the embedded member. The intermediate nut, the fastening nut, The wood member joining structure according to claim 4 or 5, wherein a part of the joint metal fitting is sandwiched between the joint metal fittings to secure the joint metal fitting.   Both ends of the long bolt are locked to the embedded member or the joint fitting in a state where elastic elongation in the axial direction occurs, and a compressive force is introduced to the embedded member by a reaction force from the long bolt. The wood member joining structure according to any one of claims 1 to 6, wherein the wood member joining structure is provided.   An intermediate nut is screwed onto the end of the long bolt that is engaged with the joint fitting, and the intermediate nut is attached to the embedded member in a state in which the long bolt is elastically stretched in the axial direction. 7. The device according to claim 1, wherein the joint fitting is fixed by being in contact with an end face and sandwiching a part of the joint fitting between the intermediate nut and the clamping nut. The crab wood structure.   In the embedded member, the long bolt is inserted into the hollow hole to lock the tip, and the intermediate nut contacts the end surface of the embedded member in a state where the long bolt is elastically stretched in the axial direction. The wood member joining structure according to claim 9, wherein the wood member joining structure is embedded in the wood member after being contacted. The wooden member is a pillar having a rectangular cross section, and notches are provided at both ends in the long side direction at the end of the wooden member,
The embedded member is embedded in the axial direction of the pillar from the notch,
The joint fitting is fixed in the notch,
The wood member joint structure according to any one of claims 1 to 10, wherein an end surface of the column is joined to face a horizontal surface of the member to be joined.

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