JP2008050776A - Column and beam joint structure and column and beam jointing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To joint wooden beam and column mutually so as to transmit bending moment and perform jointing work at site efficiently and securely. <P>SOLUTION: A joint fitting 13 provided with a horizontal plate part opposing to a lower face of the beam 2 is fixed to an end part of the column 1. A screw member 12 is screwed into the beam in the vertical direction, and a screw hole having predetermined length in the direction of axial line from an end face is provided in the screw member. A headless bolt 15 screwed into the screw hole in the screw member is inserted into a through hole 13e provided in the horizontal plate part of the joint fitting 13 from above to screw-fit a nut 16. The joint fitting is tightened and fixed on the screw member 12 by the nut 16. The headless bolt is provided with a stopper part for stopping screwing into the screw member at a position having predetermined length from a tip screwed into the screw member and is screwed in until the stopper part is butted on the screw member. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a structure and method for joining a beam and a column in a wooden building, and more particularly, a column and a beam in which relative deformation is constrained at the joint between the beam and the column and a bending moment is transmitted between the two. The present invention relates to a joining structure and a joining method between a column and a beam.

In a wooden structure that has been widely used, the connection between a beam and a column has long been performed by inserting a tenon in which the end of the beam is processed into a mortise provided in the column. Such a joint structure allows deformation between the two and hardly transmits the bending moment. In other words, the shaft assembly that cannot resist the bending moment and is formed of a plurality of columns and a plurality of beams (including members that are installed in the lateral direction such as torso, eaves, and foundations) is deformed. easy. For this reason, braces are arranged in the walls between the columns to resist deformation when a horizontal force is applied during an earthquake or the like.

  Bracing is generally provided at a plurality of positions and is required in two directions in which the directions of inclination are opposite. Therefore, in a conventional wooden building, it is necessary to secure a wall body for providing braces, which may hinder the setting of the opening and the use of the indoor space. For this reason, for example, in Patent Document 1 and Patent Document 2, the column and the beam are so-called rigid connection, that is, a connection that causes transmission of a bending moment, and the amount of bracing is reduced by using a ramen structure as the shaft assembly. Proposals have been made.

  As shown in FIG. 9, in the joint structure of the beam and the column described in Patent Document 2, two screw members 111 are screwed in the vertical direction at a predetermined interval on the surface where the beam 102 comes into contact with the column 101. ing. A screw hole is formed in the lower end portion of these screw members 111 in the axial direction. On the other hand, a notch 101 a is provided at the end of the column facing the beam 102, and a column fixing bracket 112 (connection bracket) is joined to the notch, and is provided above the column fixing bracket 112. The bolt 113 is inserted through the bolt insertion hole, and the bolt 113 is screwed into the screw hole of the screw member 111 and tightened. Thereby, the beam 102 and the column 101 are connected via the column fixing bracket 112. Therefore, when a bending moment acts between the column 101 and the beam 102, a tensile force acts on one of the two screw members 111, and a compressive force acts on the other. Therefore, the bending moment can be transmitted between the column 101 and the beam 102 without a large stress being concentrated locally on the beam 102.

As shown in FIG. 10, in the column-beam joint structure described in Patent Document 2, two embedded bolts 123 (screw members) are embedded in a vertical direction at a predetermined interval on a surface where the beam 122 abuts on the column 121. A screw hole is formed in the end portion of the embedding bolt 123 in the axial direction. Further, a notch 121 a is provided on the end surface of the column 121 facing the beam 122, and an embedded bolt 124 is embedded in the axial direction of the column 121 from the notch. A screw hole is also bored in the axial direction at the end of the embedded bolt 124. And the joining metal fitting 125 is inserted in the notch 121a of the pillar 121, the bolt 126 is inserted from the bolt insertion hole provided in this joining metal fitting 125, and the embedded bolts 123 and 124 embedded in the beam 122 and the pillar 121. The bolts 126 are screwed into the respective screw holes and tightened, whereby the beam 122 and the column 121 are connected via the joint fitting 125.
JP 2004-092149 A Japanese Patent Laid-Open No. 2004-143779

However, the conventionally known column beam connection structure as described above has the following unsolved problems.
In the joint structure described in Patent Document 1 and Patent Document 2, a bolt is inserted into a bolt insertion hole of a joint fitting, and the bolt is screwed into a screw hole (embedded bolt) screwed into a beam to be tightened. Thus, the column and the beam are connected. Therefore, with the beam suspended and supported by a crane or the like and placed at the correct position on the column, the bolt is inserted through the bolt insertion hole of the joint fitting, and the screw member (embedded bolt) screwed into the beam It must be screwed into the screw hole. At this time, if the position of the beam is not adjusted accurately, the bolt cannot be screwed into the screw hole, and it takes time to align the position of the screw hole and the bolt insertion hole, thereby reducing workability.

  The present invention has been made in view of the above circumstances, and its purpose is a structure for joining a wooden beam and a column so that a bending moment can be reliably transmitted. It is an object of the present invention to provide a column beam connection structure and a column beam connection method capable of efficiently and reliably performing the above-described bonding operation.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a joining structure of a wooden beam installed in a lateral direction and a wooden column joined to the upper surface or the lower surface of the beam, A joint fitting having a horizontal plate portion facing the upper surface or the lower surface of the beam is fixed to the end, and the screw member having a screw hole having a predetermined length in the axial direction from the end surface is attached to the beam. A headless bolt that is screwed in a vertical direction at a position facing the joint metal fitting, and is screwed into a screw hole of the screw member is inserted into a through hole provided in a horizontal plate portion of the joint metal fitting. The joint fitting is fastened and fixed to the beam by a screwed nut, and the headless bolt stops screwing into the screw member at a predetermined length from a tip screwed into the screw member. The stopper portion is provided to provide a beam-column joint structure characterized in that said stopper portion is screwed until it hits the screw member.

  In this joint structure, the screw member screwed into the beam and the joint fitting fixed to the column are joined by a headless bolt and a nut screwed into the headless bolt, so the headless bolt is screwed into the beam in advance. The screw member can be screwed into the screw hole of the screw member so that the tip protrudes downward. And, when placing the beam on the pillar, if you place it so that the protruding headless bolt is inserted through the through hole of the joint fitting fixed to the pillar, it can be easily placed at the correct position Can do. Thereafter, the nut is screwed into a headless bolt inserted through the through hole of the joint fitting and tightened to fix the joint fitting to the beam.

  Moreover, since the headless bolt used in the joining structure is provided with a stopper portion at a predetermined length from the tip screwed into the screw member, the headless bolt is screwed into the screw hole of the screw member. As a result, the predetermined length is fixed in a screwed state. And the rear part of a headless bolt protrudes from the end surface of a screw member, and the length becomes the predetermined length defined by adjusting the length of a headless bolt beforehand. Therefore, the headless bolt can be reliably screwed into the screw member with a sufficient length, and an appropriate fixing length of the nut is ensured.

  As described above, the joint fitting fixed to the column and the screw member screwed into the beam are joined by the headless bolt and nut, so that a compressive force and a tensile force are transmitted between these members. . Therefore, the joining bracket is fixed at two locations apart from the cross section of the column, so that the bending moment is also transmitted. As a rigid frame structure, in addition to the load in the vertical direction, the structure can resist horizontal forces during earthquakes, etc. Become.

  The invention which concerns on Claim 2 WHEREIN: The said stopper part shall be provided in the range smaller than the thickness of the horizontal board part of the said joining metal fitting.

  The range where the stopper part of the headless bolt used in this joint structure is provided is smaller than the thickness of the horizontal plate part of the joint metal, so that when the joint metal is fixed to the beam, the stopper part penetrates the joint metal. It fits in the hole and the stopper does not hinder tightening with the nut. Therefore, the nut can be tightened until it abuts against the horizontal plate portion of the joint fitting, and the joint fitting can be securely fastened to the screw member by the nut.

  The invention according to claim 3 is a method of joining a wooden column with a wooden beam erected in a lateral direction and an end surface abutting against a lower surface of the beam, the upper end portion of the column having the beam A fixing member having a horizontal plate portion facing the lower surface of the member is fixed, and a screw member having a screw hole in the axial direction from the end surface is screwed to the beam in a vertical direction at a position facing the connecting member, In the screw hole of the screw member, a headless bolt provided with a stopper portion that stops screwing into the screw member at a position of a predetermined length from the tip is screwed until the stopper portion hits the screw member. The beam is suspended and supported above the pillar, and the end protruding below the headless bolt while being gradually lowered is inserted into a through hole provided in the horizontal plate portion of the joint fitting, and the headless Bol The 該接 alloy tool I by tightening screwed a nut to provide a beam-column joint method which is characterized in that fixed to the beam to.

In this joining method, a headless bolt is screwed into the screw hole of the screw member screwed into the beam, and the protruding tip of the headless bolt is guided to the through hole of the joining bracket fixed to the column. The beam suspended and supported by the insertion is placed at a predetermined position on the pillar. Therefore, the beam can be easily fixed at a predetermined position on the column by screwing the nut into the headless bolt inserted through the through hole of the joint fitting and tightening the nut.
Furthermore, since the headless bolt has a stopper portion, the bolt is fixed in a state where a predetermined length is screwed into the screw hole of the screw member, and an appropriate length projects from the screw member at the rear portion of the bolt. Therefore, the headless bolt and the screw hole of the screw member can be reliably screwed together, and the fixing length of the nut can be appropriately secured.

  As described above, in the column beam connection structure according to the present invention, a headless bolt having a stopper portion provided at a predetermined position is screwed in advance into a screw hole of a screw member screwed into the beam. The beam can be suspended and supported, and the headless bolt can be inserted into the through hole of the joint fitting fixed to the column, and can be placed at an accurate position on the column. Therefore, it is possible to efficiently perform the work of joining the beam to the column. And since the stopper part is provided in the position of the predetermined length from the front-end | tip at the headless bolt, it can be fixed in the state which screwed the predetermined length in the screw hole of the screw member. And the joining bracket can be securely fixed.

  Further, in the column beam joining method according to the present invention, the headless bolt protruding from the screw member screwed into the beam is inserted into the through hole of the joint fitting fixed to the column, so that the beam is accurately placed on the column. Can be deferred to any position. Then, a nut can be screwed onto the headless bolt and tightened to join the column and the beam efficiently. Moreover, since the headless bolt is provided with the stopper part, the operation | work which screws in predetermined length beforehand to the screw member by the side of a beam can be performed easily and correctly.

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 column beam connection structure according to the present invention is suitably used.
In this structural frame, the lower layer part constituting the first floor and the upper layer part constituting the second floor are each formed by combining a plurality of rigid frame structures in which columns and beams are rigidly connected, and by laminating them, The entire structural housing is formed. Each of the ramen frames has a so-called beam winning structure in which wooden beams 2 and 4 are placed on and joined to the wooden columns 1 and 3. The columns 1 and 3 and the columns 1 and 3 constituting the ramen frame, respectively. The beams 2 and 4 are flat members having a large cross-sectional dimension in a direction parallel to the elevational plane including these axes, and a small cross-sectional dimension in a direction perpendicular thereto. Therefore, the joint portion of each frame structure has a structure that resists bending in one direction.

  These frames are joined so that the directions are perpendicular to each other on a plane, that is, the beams 2-1, 2-2, 4-1 and 4-2 of a plurality of frames are perpendicular to each other. Has been. Thus, a plurality of rigid frame structures that resist horizontal forces in different directions are combined with each other to form a structural frame that can resist horizontal forces in all directions. The upper column 3 is erected on the beam 2 of the lower frame structure, and the bending moment is transmitted also at these joints.

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 beam 2 used in the rigid frame structure shown in FIG. 1 and the column 1 of the lower layer portion. 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 joining structure, notches 1 b are provided at both ends in the long side direction on the upper end surface of the pillar 1, and the central portion 1 a is in contact with the lower surface of the beam 2. And the two 1st screw members 11 and 11 are screwed in from the notch part 1b of the pillar 1 to the axial direction of this pillar. On the other hand, two second screw members 12 and 12 are also screwed in the corresponding positions of the beam 2 in the vertical direction, and these first and second screw members 11 and 12 are axially extended from the end surfaces. Screw holes 11b and 12b are formed. A headless bolt 15 is screwed into the screw hole 12 b of the second screw member 12 screwed into the beam 2, and a nut 16 is screwed into the headless bolt 15. On the other hand, a bolt 14 is screwed into the screw hole 11 b of the first screw member 11 screwed into the column 1. And the joining metal fitting 13 arrange | positioned in the notch part 1b of a pillar is couple | bonded with the 1st screw member 11 with the volt | bolt 14, and is couple | bonded with the 2nd screw member 11 with the headless volt | bolt 15 and the nut 16. . Thereby, the pillar 1 and the beam 2 are joined via the screw members 11 and 12 and the joint fitting 13.

  The first and second screw members 11 and 12 are the same, and as shown in a plan view and a front view in FIG. 4, a spiral projecting portion 11 a is provided on the side surface of the rod-shaped steel member. As described above, the screw holes 11b in the axial direction are provided on both end faces. As shown in FIG. 2, each screw member 11, 12 is formed by providing a vertical hole in the beam 2 or the pillar 1, and further screwing in after cutting a spiral groove.

  As shown in FIG. 5, the headless bolt 15 is a bolt in which a stopper portion 15a is provided at an intermediate portion in the length direction, and a male screw is formed over the entire length excluding this portion. The stopper portion 15a is provided at a position of a predetermined length from the tip 15c screwed to the beam side, and stops the screwing of the headless bolt 15 in a state where a length capable of sufficiently resisting the drawing is screwed. Is. On the other hand, the opposite side of the stopper portion 15a has a length that allows the nut 16 to be screwed together to fasten the joint fitting 13. The end face 15d is provided with a tool engagement groove 15b used when screwing into the beam side screw member.

  As shown in FIG. 6, the joint fitting 13 includes two upper horizontal plate portions 13a and a lower horizontal plate portion 13b that are opposed to each other in the vertical direction, and side plate portions 13c that join the edges of these horizontal plate portions 13a and 13b to each other. The upper horizontal plate portion 13a is provided with an upper bolt hole 13d, and the lower horizontal plate portion is provided with a lower bolt hole 13e. The upper horizontal plate portion 13a is brought into contact with the lower end surface of the second screw member 12 screwed into the beam 2, and is fastened and fixed by a headless bolt 15 and a nut 16 inserted through the upper bolt hole 13d. At that time, the range of the stopper portion 15a is set so that the stopper portion 15a of the headless bolt fits within the plate thickness of the upper horizontal plate portion in the upper bolt hole 13d. On the other hand, the lower horizontal plate portion 13b is brought into contact with the upper end surface of the first screw member 11 screwed into the column 1 and is fixed by a bolt 14 inserted through the lower bolt hole 13e.

Moreover, as shown in FIG. 6, the said joining metal fitting 13 has one side part open | released, and the other side of this open part becomes a cylindrical curved surface which has an axis line in the perpendicular direction. In other words, the cross section is uniform in the vertical direction, and the back side of the planar shape is arcuate.
The dimensions of the joint fitting 13 are such that the horizontal width and depth are smaller than the short side of the cross section of the pillar 1, and the height is substantially the same as the vertical dimension of the notch 1 b provided at the end of the pillar 1. Are equal.

Next, the process of joining the column 1 and the beam 2 will be described.
The pillar 1 is provided with a notch 1b having a predetermined dimension at an end portion at a processing stage in a factory or the like. Then, a hole is cut in the axial direction from the notch, and the screw member 11 is screwed. A bolt 14 is screwed into a screw hole 11b provided at the end of the screw member 11, and the joining fitting 13 is fixed to the notch 1b. Further, the screw 2 is screwed into the beam 2 at a predetermined position by work in a factory or the like.

At the site where the column 1 and the beam 2 are assembled, the column 1 is erected at a predetermined position. Then, a headless bolt 15 is screwed into the screw hole 12b of the second screw member 12 embedded in the beam 2, and the tip protrudes downward. At that time, a tool such as a screwdriver is engaged and screwed into the tool engaging groove 15b of the headless bolt, and screwed until the stopper portion 15a hits the screw member 12.
Thereafter, the beam 2 is lifted above the upright column, and the tip of the headless bolt 15 screwed into the second screw member 12 is supported at a position facing the joint fitting 13 fixed to the column 1. . Then, a headless bolt 15 is inserted into the upper bolt hole 13d of the joint fitting 13 fixed to the column 1 while the beam 2 is slowly lowered, and the beam 2 is slowly lowered and the column 1 is accurately positioned. Place on top.

Thereafter, the nut 16 is screwed onto the tip of the headless bolt 15 from the open part of the side surface of the joint fitting 13 fixed to the column 1. At this time, by slightly loosening the bolts 14 fixing the joining metal fitting 13 to the column 1, the joining metal fitting 13 can be rotated around the bolt 14. The back side of the open portion provided on the side of the joint fitting 13 is a cylindrical curved surface and does not have an apex portion, and thus freely rotates without hitting the vertical surface in the pillar notch 1b. Therefore, the work of tightening the nut 16 and the bolt 14 by inserting the tool from the open portion and directing the joint fitting 13 in the direction in which the work becomes easy can be performed efficiently.
Then, by strongly tightening the bolt 14 and the nut 16, the joint fitting 13 is joined to both the first screw member 11 screwed into the column 1 and the second screw member 12 screwed into the beam 2.

  Since the headless bolt 15 screwed into the second screw member 12 includes the stopper portion 15a when the joining fitting 13 is fixed to the beam 2 as described above, a predetermined length is screwed into the screw member 12. The rotation is stopped in the state. As a result, a predetermined length is reliably screwed into the second screw member 12 on the beam side, and the rear portion of the headless bolt 15 protrudes from the end surface of the second screw member 12 by a predetermined length, and the nut 16 is screwed together. Thus, a projection length sufficient to tighten the joint fitting 13 is secured. Moreover, the stopper portion 15a of the headless bolt is accommodated in the upper bolt hole 13d of the joint fitting 13 and does not protrude downward from the upper horizontal plate portion 13a. Therefore, the nut 16 can be tightened until it abuts against the upper horizontal plate portion 13a, and the joining fitting 13 can be firmly fixed.

  Instead of the headless bolt 15 used in the joining structure, a headless bolt 25 whose outer diameter is gradually reduced at the tip can be used as shown in FIG. When the headless bolt 25 is screwed into the second screw member 12 on the beam side and the distal end portion 25b having a reduced diameter is protruded downward, the beam 2 is lifted to connect the headless bolt 25 to the upper bolt of the joint fitting 13. When passing through the hole 13d, the inclined surface having the reduced diameter is rubbed against the periphery of the upper bolt hole 13d, and the beam is guided to an accurate position. Therefore, the position of the lifted beam can be easily adjusted, and work efficiency is improved.

  By joining the column 1 and the beam 2 as described above, the lower surface of the beam 2 is pressed against the center portion 1a of the column 1 and the second screwed into the beam 2 as shown in FIG. The screw members 12 and 12 are connected to the first screw members 11 and 11 via the joint fitting 13 at both ends in the long side direction of the column cross section. As a result, a vertical load acting on the beam 2 is supported by the column 1, and deformation between both is constrained at the joint between the column 1 and the beam 2, and a bending moment is transmitted. As a result, a rigid frame structure having a large rigidity is formed and can resist a horizontal force.

The embodiment described above is a joint structure of the column 1 of the lower layer portion and the beam 2 supported on the lower portion, but the joint portion of the beam 2 and the column 3 of the upper layer portion erected thereon. In addition, the same configuration can be adopted by inverting the top and bottom. At this time, the headless bolt 15 is screwed into the second screw member screwed into the beam 2, the column 3 to which the joint fitting 13 is fixed is lifted, and the headless bolt 15 is fitted into the bolt hole of the joint fitting 13. The pillar 3 is slowly lowered so as to be inserted.
When the upper column 3 is erected at the same position after the lower column 1 and the beam 2 are joined by the above structure, the second screw member 12 screwed into the beam 2 is connected to the upper column 3. 3 and the beam 2 can also be used in common. As a result, the lower pillar 1 and the upper pillar 3 are coupled by the first screw member 11 and the joint fitting 31, and both the pillars 1 and 3 have rigidity close to that of the through pillar.

It is a schematic perspective view which shows the structural frame of the wooden building in which the column beam junction structure of this invention is used suitably. FIG. 2 is an exploded perspective view of a beam-column joining structure that can be suitably used in the structural housing shown in FIG. 1 and that is an embodiment of the invention according to the present application. It is sectional drawing of the column beam junction structure shown in FIG. 2, and shows a cross section parallel to the axis line of a rigid frame structure. FIG. 4 is a plan view and a front view of a screw member used in the column beam joining structure shown in FIGS. 2 and 3. FIG. 4 is a schematic perspective view and a side view of a headless bolt used in the column beam joint structure shown in FIGS. 2 and 3. FIG. 4 is a schematic perspective view of a connection fitting used in the column beam joining structure shown in FIGS. 2 and 3. It is a schematic perspective view which shows the external appearance of the column beam junction structure shown in FIG.2 and FIG.3, Comprising: It is the figure seen from diagonally downward. It is the schematic perspective view and side view which show the other example of the headless volt | bolt used with the beam-column joining structure shown in FIG.2 and FIG.3. It is a schematic perspective view which shows the conventional column beam junction structure. It is a schematic perspective view which shows the other example of the conventional column beam junction structure.

Explanation of symbols

1,3: pillar, 1a: central part of pillar end face, 1b: notch,
2, 4: Beam,
11: 1st screw member, 11a: Spiral overhang part, 11b: Screw hole, 12: 2nd screw member, 13: Joining metal fitting, 13a: Upper horizontal board part, 13b: Lower horizontal board part, 13c: Side board Part, 13d: upper bolt hole, 13e: lower bolt hole, 14: bolt, 15: headless bolt, 15a: stopper part, 15b: tool engaging groove, 16: nut, 25: headless bolt

Claims (3)

It is a joint structure of a wooden beam erected in the lateral direction and a wooden pillar joined to the upper or lower surface of this beam,
At the end of the column, a joining bracket having a horizontal plate portion facing the upper or lower surface of the beam is fixed,
A screw member having a screw hole of a predetermined length in the axial direction from the end surface is screwed into the beam in a vertical direction at a position facing the joint fitting,
A headless bolt screwed into a screw hole of the screw member is inserted into a through hole provided in the horizontal plate portion of the joint fitting,
The joint fitting is fastened and fixed to the beam by a nut screwed to the headless bolt,
The headless bolt is provided with a stopper portion that stops screwing into the screw member at a predetermined length from the tip screwed into the screw member, and is screwed in until the stopper portion hits the screw member. Column beam connection structure characterized by having.   The column beam connection structure according to claim 1, wherein the stopper portion is provided in a range smaller than a thickness of a horizontal plate portion of the joining metal fitting. It is a method of joining wooden pillars by abutting the end face to the lower surface of this beam and the wooden beam laid in the lateral direction,
At the upper end of the column, a joining bracket having a horizontal plate portion facing the lower surface of the beam is fixed,
In the beam, a screw member having a screw hole in the axial direction from the end surface is screwed in a vertical direction at a position facing the joint fitting,
In the screw hole of the screw member, a headless bolt provided with a stopper portion that stops screwing into the screw member at a position of a predetermined length from the tip is screwed in until the stopper portion hits the screw member,
Suspend and support the beam above the upright pillar, and insert the end protruding below the headless bolt while gradually descending, through a through hole provided in the horizontal plate portion of the joint fitting,
A beam-to-column joining method, wherein the joint fitting is fixed to the beam by screwing and tightening a nut to the headless bolt.

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