JP2015193995A - Beam joining structure and beam joining method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a beam joining structure that enables the work for connecting a steel beam to the side surface of a wooden beam to be performed efficiently.SOLUTION: Beam joint fittings 12 are fixed to the side surface of a wooden beam 2. The beam joint fittings have two overhang plates 12b protruded in an axial direction of a steel beam 3 to be joined. Holes penetrated in a web 3c of the steel beam are formed, and joint additional members 16 fitted in the holes and protruded on both sides of the web are fixed. Then, the portions with the joint additional members of the web fixed thereto are inserted between two overhang plates included in the beam joint fittings. The joint additional members have through-holes penetrating between both ends protruded. Bolts 14 are inserted in bolt holes 12d provided in the overhang plates and in the through-holes formed in joint additional members, and tightened by nuts 15. The joint additional members may be made by thick diameter bolts having the through-holes along the central axis and the nuts for the thick diameter bolts screwed thereto.

Description

  The present invention relates to a structure in which a structural frame is constructed mainly using wood and steel, and relates to a joint structure of beams that are joined with the end face of another beam facing the side face of the beam, particularly on the side face of a wooden beam. The present invention relates to a structure for joining the ends of steel beams.

  As a joint structure between beams in a wooden building, for example, there is one described in Patent Document 1. In this joining structure, a beam joining bracket is fixed to the side surface of the first wooden beam, and an end portion of the second wooden beam is coupled to and supported by the beam joining bracket. The above-mentioned beam joint metal fitting is formed by bending a steel plate material, a fixed base that is fixed in contact with a side surface of the first beam, and a side of the first beam from both side edges of the fixed base. And a projecting plate portion projecting in the direction. At the end of the second beam, a pin hole penetrating in the lateral direction is provided, and a hole is formed in the overhanging plate portion and a pin is inserted into the pin hole so that the second beam is formed in the two overhanging plate portions. Are combined.

  On the other hand, steel beams may be used in combination with wooden beams even in structures in which the main part of the structural frame is made of wood. For example, a steel beam is used when a large space with few columns is required indoors and the span of the beam becomes large. In particular, when a load acting on an upper floor is supported by a beam having a large span, bending and vibration can be suppressed by using a steel beam.

As a structure for joining a steel beam to a side surface of a wooden beam, there is one disclosed in Patent Document 2. As shown in FIG. 8, this joining structure is formed by arranging a steel beam 101 having an upper flange, a lower flange, and a web for connecting the upper and lower flanges so that the end face thereof faces the side surface of the wooden beam 102. It is what is joined. A beam joint 103 having the same form as the beam joint used in the joint structure described in Patent Document 1 is fixed to the wooden beam 102 by bolts 107. Then, the web 101 a of the steel beam 101 is coupled to the projecting plate portions 103 a and 103 b of the beam joint 103.
In this joint structure, the beam joint fitting 103 can be fixed with the same specifications as when two wooden beams are joined. From the steel beam 101 to the wooden beam 102 via the beam joint fitting 103, a vertical direction is provided. It has excellent features such as the ability to transmit force without decentering the line of force action. Therefore, when these beams are joined, the steel beam 101 can be supported in a stable state and work can be performed, and the steel beam 101 can be stably and firmly secured even after the steel beam 101 is fixed. Can be supported.

JP 2004-92149 A JP 2008-115608 A

However, the joint structure described in Patent Document 2 has a problem in which the following improvement is desired.
In the joint structure described in Patent Document 2, a steel beam web 101 a is supported between two projecting plate portions 103 a and 103 b of a beam joint fitting 103 fixed to a wooden beam 102. The two overhanging plate portions 103a and 103b and the steel beam web 101a are separated from each other, and spacer pipes 104a and 104b, which are steel tubular members, are interposed therebetween. In other words, the beam 105 is fastened with the bolt 105 to the web 101a via the spacer pipe 104 to restrain the steel beam web 101a from moving laterally between the two overhanging plate portions 103a and 103b. It has become.

Thus, the operation | work which mounts the volt | bolt 105 by inserting the spacer pipes 104a and 104b between the overhang | projection board parts 103a and 103b of a beam joining metal fitting and the web 101a is performed as follows, for example.
One spacer pipe 104a is held between one overhanging plate portion 103a and the web 101a in a state where the steel beam 101 is supported at a predetermined position, and is provided on the overhanging plate portion 103a from the side of the beam joint fitting 103. The bolt 105 is inserted inside the bolt hole 103c and the spacer pipe 104a. The spacer pipe 104a is supported by the bolt 105 between the projecting plate portion 103a and the web 101a when the tip of the bolt 105 reaches the hole 101b provided in the web 101a. Furthermore, another spacer pipe 104b is held between the opposite side surface of the web 101a and the other overhanging plate portion 103b, and the tip of the bolt 105 is placed inside the other spacer pipe 104b and the other overhanging plate portion 103b. Through the bolt hole. As a result, the two spacer pipes 104a and 104b are supported between the projecting plate portions 103a and 103b on both sides of the web 101a, and the nuts 106 are screwed onto the bolts 105 and tightened.

  When joining the beam joint fitting 103 and the steel beam 101 in such a process, the two spacer pipes 104a and 104b are held between the web 101a and the projecting plate portions 103a and 103b of the beam joint fitting to tighten the bolts. The process of inserting 105 has poor workability and makes it difficult to join the beams efficiently.

  The present invention has been made in view of the circumstances as described above, and the purpose thereof is a beam joining structure and a beam capable of efficiently performing a work of joining a steel beam to a side surface of a wooden beam. It is to provide a bonding method.

  In order to solve the above-mentioned problem, the invention according to claim 1 is directed to an end portion of a steel beam having a beam joining bracket fixed to a side surface of a wooden beam, and having an upper flange, a lower flange, and a web for connecting them vertically. Is a joint structure of a beam joined to the wooden beam via the beam joint metal fitting, the beam joint metal fitting fixed to a side surface of the wooden beam, and both sides of the fixed base part Two projecting plate portions protruding from the edge in the axial direction of the steel beam, and the steel beam is formed with a hole penetrating the web at an end joined to the wooden beam, the web A joining additional member having a through-hole penetrating between both ends of the web is fixed to the web, and the joining additional member of the web is fixed. The beam joining bracket comprises A bolt is inserted between two projecting plate portions, a bolt hole provided in the projecting plate portion and a through hole formed in the joining additional member, and the two projecting plates are screwed into the bolts by nuts screwed into the bolts. Provided is a beam joining structure in which a portion is clamped so as to be pressed against both ends of the joining additional member.

  In this joining structure, the joining additional member is fixed to the steel beam web, and the portion where the joining additional member is secured is inserted between the two projecting plate portions of the beam joining metal fitting, and is attached to one projecting plate portion. The bolt can be easily inserted from the provided bolt hole into the through hole provided in the joining additional member and the bolt hole provided in the other overhanging plate portion. Then, by tightening the nut screwed to the bolt, the projecting plate portions are pressed against both ends of the joining addition member protruding from the web, and the web to which the joining addition member is fixed and the beam joining bracket are firmly fixed. The

  The invention according to claim 2 is the beam joining structure according to claim 1, wherein the joining additional member is locked to a shaft portion inserted into a hole formed in the web and a peripheral portion of the hole. A large-diameter bolt in which a through-hole penetrating the shaft portion and the head portion in the axial direction is formed, and a nut for a large-diameter bolt screwed into the large-diameter bolt, The steel beam web is sandwiched between the head of the large-diameter bolt and the nut for the large-diameter bolt, and is fastened and fixed.

  In this joining structure, the shaft portion of the large-diameter bolt is inserted into a hole formed in the web, and a large-diameter bolt nut is screwed and tightened from the opposite side of the web to thereby secure the joining additional member to the web. Can be easily and firmly fixed.

  According to a third aspect of the present invention, in the beam joining structure according to the first aspect, the joining additional member is locked to a shaft portion inserted into a hole formed in the web and a peripheral portion of the hole. A convex member having a shaft and a through-hole penetrating the head in the axial direction, and an annular member fitted to the outside of the shaft. It is assumed that the steel beam web is sandwiched between the head of the shaped member and the annular member, and the joining member is fixed to the web.

  In this joining structure, the joining additional member can be easily fixed by inserting the shaft portion of the convex member into the hole formed in the web and fitting the annular member from the opposite side of the web. .

  According to a fourth aspect of the present invention, there is provided a beam joint including a fixed base that is in contact with a side surface of a wooden beam and two projecting plate portions that protrude substantially perpendicularly from both side edges of the fixed base. A hole penetrating the web is formed at the end of a steel beam having a top flange, a lower flange, and a web that connects the upper and lower flanges up and down, and inserted into the hole formed in the web. A first member having a shaft portion and a head portion locked to a peripheral portion of the hole, and having a through hole penetrating the shaft portion and the head portion in the axial direction; and a shaft portion of the first member A joining addition member comprising a second member that is mounted and sandwiches the steel beam web between the head of the first member protrudes on both sides of the hole formed in the steel beam web And fixing the portion of the web where the joining additional member is fixed to the beam joining bracket. Inserted between two projecting plate portions, a bolt is inserted into a bolt hole provided in the projecting plate portion and a through hole formed in the joining additional member, and a nut screwed into the bolt is inserted into the two Provided is a beam joining method for tightening so that an overhanging plate portion is pressed against the joining additional member.

  In this method, since the joining additional member protrudes and is fixed to both sides of the steel beam web in advance, the web in which the joining additional member is fixed is inserted between the two projecting plate portions of the beam joining bracket, A bolt can be easily inserted from a bolt hole provided in one overhanging plate portion into a through hole provided in the joining additional member and a bolt hole provided in the other overhanging plate portion. Then, by tightening the nut screwed to the bolt, the web to which the joining additional member is fixed and the beam joining bracket can be firmly fixed.

  As described above, in the beam joining structure and the beam joining method of the present invention, a steel beam can be joined to a side surface of a wooden beam by an efficient operation.

It is a schematic perspective view which shows the structural frame of the building in which the joining structure of the beam which concerns on this invention is used suitably. It is a disassembled perspective view which shows the joining structure of the beam which is one Embodiment of this invention. FIG. 3 is an elevational sectional view of the beam joining structure shown in FIG. 2. FIG. 3 is a cross-sectional plan view of the beam joining structure shown in FIG. 2. FIG. 5 is an elevational sectional view of the joining structure of the beams shown in FIG. 2, which is a sectional view taken along the line CC shown in FIGS. 3 and 4. FIG. 3 is a schematic perspective view of a joining addition member used in the beam joining structure shown in FIG. 2 and a schematic perspective view of a portion that joins a steel beam web and a beam joining bracket using the joining addition member. It is the schematic perspective view of the joining addition member used with the joining structure of the beam which is other embodiment of this invention, and the schematic sectional drawing which shows the junction part of the beam joining metal fitting and the web of steel beams in this joining structure. It is a disassembled perspective view which shows the prior art example of the structure which joins a wooden beam and a steel beam.

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 building in which a beam joining structure according to the present invention is suitably used.
This structural frame has a main part formed by combining a plurality of rigid frame structures in which a wooden column 1 and a wooden beam 2 are joined so that a bending moment can be transmitted, and a steel beam 3. The cross-sectional shape of the wooden pillar 1 constituting each frame structure is a flat rectangle with a large cross-sectional dimension in the axial direction of the wooden beam 2, and the cross-sectional shape of the wooden beam 2 is horizontal in the horizontal direction. It is a flat rectangle larger than the direction. Therefore, each member of each frame structure is mainly used as a member that resists bending in one direction, and a plurality of one-way frames are combined in directions perpendicular to each other to form a structural frame. Each frame structure has a so-called beam-winning structure in which the lower surface of the wooden beam 2 is brought into contact with and joined to the upper end surface of the wooden column 1, and the plurality of rigid frame structures are bonded to each wooden beam and wooden beam. Are connected to each other.

  Moreover, although the upper floor 4 of this building is shown by the imaginary line in FIG. 1 and the details are omitted, it can have the same structure as the lower floor shown in FIG. In other words, a wooden column is erected on the wooden beam 2 of the ramen frame constituting the lower floor so that the bending moment can be transmitted, and the wooden beam can be transmitted on the upper surface of the wooden column. Can be joined.

  On the lower floor, a large room without columns between walls is provided, and the beam supporting the ceiling of this room and the upper floor on this room has a large span. A steel beam 3 is used as a beam for supporting this large span, and is supported by joining both ends to the side surface of the wooden beam 2 forming the frame structure. This steel beam 3 has an upper flange, a lower flange, and a web for connecting them up and down, and has an I-shaped cross section whose dimension is larger in the height direction than in the lateral direction.

FIG. 2 is an exploded perspective view showing a structure for joining the wooden beam 2 and the steel beam 3 in the structural frame shown in FIG. 3 is an elevational sectional view of the same joint structure, FIG. 4 is a plan sectional view, and FIG. 5 is an elevational sectional view taken along the line CC in FIGS.
In this joining structure, the end faces of the steel beam 3 are opposed to the side surface of the wooden beam 2 and both are joined, and the beam joining bracket 12 is fixed to the side surface of the wooden beam 2 where the screw member 11 is screwed. Has been. The steel beam 3 is joined to the wooden beam 2 via the beam joint fitting 12. The steel beam 3 has an I-shaped cross section having a height higher than that of the wooden beam 2, and is joined so that the upper surface of the steel beam 3 is substantially the same height as the upper surface of the wooden beam 2.

  The screw member 11 is provided with a spiral projecting portion on the side surface of a rod-shaped steel member, and a through hole 11a is provided at a middle portion in the length direction in a direction perpendicular to the axis. As shown in FIG. 2, the screw member 11 is provided with a vertical through hole 2 a at a predetermined position of the wooden beam 2, and further screwed after cutting a spiral groove. The length of the end surface is adjusted so as to substantially coincide with the upper surface and the lower surface of the wooden beam 2.

As shown in FIG. 2, the beam joining bracket 12 includes a fixed base portion 12a that is in contact with the side surface of the wooden beam 2, and two projecting plate portions 12b that project in parallel from both side edges in the vertical direction of the fixed base portion 12a. I have it. The beam joint 12 is formed by bending a steel plate, and the thickness of the steel plate is such that excessive deformation does not occur during use.
The fixed base portion 12 a is provided with a plurality of bolt holes through which bolts 13 for fixing the beam joint metal 12 to the wooden beam 2 are inserted. Further, as shown in FIG. 3 or FIG. 4, the periphery of the bolt hole is a convex portion 12c protruding to the side of the wooden beam attached by pressing, and is fitted into the concave portion 2b provided in the wooden beam 2. It is supposed to be put in.
The overhanging plate portion 12b is provided with a plurality of bolt holes 12d through which bolts 14 for coupling the beam joining bracket 12 to the steel beam 3 are inserted, and the bolts 14 are locked near the upper end and the lower end. A notch 12e is provided.

A concave portion 2b having a size corresponding to the convex portion 12c of the beam joint fitting is formed on a side surface of the wooden beam 2 at a position where the beam joint fitting 12 is fixed, and the wooden beam 2 is horizontally penetrated from the bottom. A lateral hole 2c is formed. The lateral hole 2c passes through the through hole 2a into which the screw member 11 is screwed, and the lateral through hole 11a provided in the screw member 11 is when the screw member 11 is screwed into the wooden beam 2. It corresponds to the position of the horizontal hole 2c.
A convex portion 12 c provided on the fixed base portion 12 a of the beam joint fitting is fitted into the concave portion 2 b provided on the side surface of the wooden beam 2, and the bolt 13 inserted into the lateral hole 2 c from the opposite side of the wooden beam 2. Passes through the through hole 11a of the screw member and is inserted into the bolt hole of the fixed base 12a. Then, the beam joint fitting 12 is fixed to the side surface of the wooden beam 2 by screwing the nut 17 into the bolt 13 from between the two overhanging plate portions 12b and tightening.
In this embodiment, a nut with a plate-like leaf spring is used as the nut 17, but other nuts can be used, and it is preferable to have a locking means.

  The steel beam 3 may be a member processed by joining structural steel plates to have an I-shaped cross section, or a steel having an I-shaped cross section formed by rolling. At the end of the steel beam web 3c, a plurality of holes for coupling to the beam joint 12 are provided, and a joining member 16 is fixed so as to protrude to both sides of the hole. Further, as shown in FIG. 3, the lower flange 3b and the web 3c are notched at the ends, and when the steel beam 3 is lowered from above and supported at a position where it is joined to the wooden beam 2, the beam is joined. The lower flange 3b does not abut against the projecting plate portion 12b of the metal fitting 12. Such a steel beam 3 is supported so that the center line of the web 3c coincides with the center line of the beam joining bracket 12, that is, the web 3c is supported between two projecting plate portions 12b. 12.

As shown in FIG. 6A, the joining addition member 16 includes a large-diameter bolt 21 and a large-diameter bolt nut 22 screwed into the large-diameter bolt 21. The large-diameter bolt 21 has a shaft portion 21a that can be inserted into a hole 3d formed in the web, and a head portion 21b that is formed integrally with the shaft portion. The head portion 21b is locked around the hole when the shaft portion 21a is inserted into the hole 3d formed in the web. And the through-hole 21c of the axial direction is formed so that the axial part 21a and the head 21b of the said large diameter bolt may be penetrated. The nut 22 for the large diameter bolt is screwed into a male screw formed on the shaft portion 21a of the large diameter bolt.
The shaft portion 21a of the large-diameter bolt is inserted into the hole 3d formed in the web from the side of the web 3c, and the large-diameter bolt nut 22 is screwed into the shaft portion 21a from the side opposite to the web 3c. . As a result, the web 3c can be sandwiched between the head 21b of the large-diameter bolt and the nut 22 for the large-diameter bolt, and the joining member 16 can be fixed to the web 3c.

The thicknesses of the head 21b of the large-diameter bolt and the nut 22 for the large-diameter bolt, that is, the dimensions in the axial direction are substantially equal. Therefore, when these are fixed to the web 3c as described above, the web 3c protrudes to both sides from the side surface with substantially the same dimensions.
When the large bolt 21 is screwed into the large bolt 21 and the web 3c is sandwiched between the large bolt head 21b and the large bolt nut 22, the shaft portion of the large bolt is obtained. 21 a is set so that it does not penetrate through the large-diameter bolt nut 22, and the tip remains within the thickness range of the large-diameter bolt nut 22. Further, the shaft portion 21a is provided with a portion 21d where a male screw is not formed in a range in which the shaft portion 21a cannot be screwed into the large-diameter bolt nut 22 near the base with the head portion 21b. This portion is opposed to the inner peripheral surface in the hole 3d formed in the web 3c, and the supporting pressure acting from the web 3c mainly acts on this portion.

  Thus, the joining addition member 16 fixed to the web 3c protrudes from the side surface of the web 3c to both sides, and the head 21b of the large diameter bolt and the nut 22 for the large diameter bolt are substantially parallel to the side surface of the web 3c. A vertical plane is formed. The distance between these vertical surfaces is substantially the same as the distance between the two overhanging plate portions 12b of the beam joining bracket 12. And between these vertical surfaces, the through-hole which can penetrate the volt | bolt 14 in the substantially horizontal direction is formed. Accordingly, as shown in FIG. 6 (b), the web 3c to which the joining additional member 16 is fixed is inserted between the two projecting plate portions 12b of the beam joining bracket 12, and joined from the bolt holes 12d provided in the projecting plate portion. The bolt 14 can be inserted through the web 3 c along the center line of the additional member 16. By this bolt 14 and the nut 15 screwed to this bolt, the web 3c to which the joining additional member 16 is fixed and the beam joining bracket 12 can be fastened and fixed.

The beams can be joined by the joining structure as described above as follows.
First, the screw member 11 is screwed into the wooden beam 2, and the beam joint 12 is fixed to the side surface of the wooden beam 2 with bolts 13 and nuts 17. On the other hand, as shown in FIG. 6 (b), the steel beam 3 is screwed with the large-diameter bolt 21 and the large-diameter bolt nut 22 of the joint addition member 16 to fix the plurality of joint addition members 16. The head 21b of the large diameter bolt and the nut 22 for the large diameter bolt are protruded from both side surfaces of the web 3c. And only about the uppermost joining addition member 16, the bolt 14 is inserted into the through-hole 21c of the large-diameter bolt, and the nut 15 with the plate-shaped leaf spring is screwed together. At this time, although the bolt 14 and the nut 15 are screwed together, the joining member 16 is loosely engaged without being tightened.

  The steel beam 3 to which the joining additional member 16 is fixed is suspended and supported so that the end portion is above the joining position of the wooden beam 2 already installed, that is, the position to which the beam joining metal fitting 12 is fixed, and descends slowly. Let At this time, the end of the lower flange 3b of the steel beam 3 is cut off, and the steel beam 3 descends without being blocked by the beam joining metal 12 protruding from the side surface of the wooden beam 2, so that the joining additional member 16 of the web 3c is moved. The fixed portion is inserted between the two overhanging plate portions 12 b of the beam joint metal 12. Then, the bolt 14 penetrating the uppermost joining addition member 16 is fitted into a notch 12e provided at the upper portion of the overhanging plate portion 12b and opened upward, and the bolt 14 is locked in the notch 12e. Is done. Thereby, the steel beam 3 is temporarily supported at a predetermined position, and the position of the bolt hole 12d provided in the overhanging plate portion 12b and the position of the through hole 21c of the joining addition member 16 fixed to the steel beam 3 are the same. It has become. Then, the bolt 14 is inserted into the bolt hole 12d provided in the overhanging plate portion 12b and the through hole 21c provided in the joining addition member 16, and the screwed nut 15 is tightened. Further, the nut 15 is similarly tightened with respect to the bolt 14 inserted through the joining addition member 16 fixed to the top. As a result, the two overhanging plate portions 12 b of the beam joining bracket are pressed against the vertical surfaces at both ends of the joining addition member 16, and the steel beam 3 is coupled to the beam joining fitting 12 via the joining addition member 16.

In such a joint structure, the vertical force acting on the steel beam 3 is transmitted to the projecting plate portion 12b of the beam joint metal via the joint addition member 16 and the bolt 14, and further the fixed base 12a of the beam joint metal. To the wooden beam 2. The screw member 11 has a helical projecting portion formed on the peripheral surface thereof locked to the wooden beam 2 over almost the entire length, and the vertical force acting from the steel beam 3 causes a crack or the like in the wooden beam 2. It is what suppresses.
Further, the steel beam web 3c is fixed and supported at the center between the two overhanging plate portions 12b, and the vertical force is transmitted from the beam joint 12 to the screw member 11 without the action line being decentered. The Therefore, the steel beam 3 can be supported in a stable state.

FIG. 7 is a schematic perspective view of a joining member that can be used in a joining structure of beams according to another embodiment of the present invention, and a joining member and a steel beam web are joined using this joining member. It is a schematic sectional drawing of the part to do.
In this joining structure, the joining additional member has a different form from that used in the joining structure shown in FIGS. 3, 4, and 6, but the other configurations are the same.
As shown in FIG. 7A, the joining addition member 30 used in this joining structure is composed of a convex member 31 and an annular member 32 that are fitted together.
The convex member 31 has a shaft portion 31a that can be inserted into a hole 3d formed in the web 3c, and a head portion 31b that is formed integrally with the shaft portion 31a. The head portion 31b can be locked around the hole 3d when the shaft portion 31a is inserted into the hole 3d formed in the web 3c. The shaft portion 31a is not formed with a male screw on the outer peripheral surface, and a ring-shaped member 31d capable of elastic deformation is fitted on the outer peripheral surface. Then, similarly to the large-diameter bolt 21 shown in FIG. 6, an axial through hole 31c is formed so as to penetrate the shaft portion 31a and the head portion 31b.
The ring-shaped member 31d is formed of a material that deforms more flexibly than the metal forming the convex member 31 and the annular member 32, and for example, a material made of synthetic resin can be employed.
On the other hand, the annular member 32 has a cylindrical outer peripheral surface and an inner peripheral surface, and is fitted on the outer side of the shaft portion 31a of the convex member. Accordingly, the inner peripheral surface is smoothly finished and can be fitted in a state of being pressed against the ring-shaped member 31d mounted on the shaft portion 31a of the convex member.

In such a joining structure using the joining member, the shaft portion 31a of the convex member is inserted into the hole 3d formed in the web 3c, and the annular member 32 is fitted to the shaft portion 31a from the opposite side. Thereby, the joining addition member 30 which consists of the convex member 31 and the annular member 32 is fixed to the web 3c of a steel beam, and the head 31b and the annular member 32 of the convex member protrude on both sides of the web 3c. It becomes. At this time, the annular member 32 is fitted into the shaft portion 31a of the convex member via the ring-shaped member 31d, and the annular member 32 is allowed to be fitted into and pulled out from the shaft portion 31a of the convex member. However, resistance is given to the above operation.
The steel beam to which the joining additional member 30 is fixed in this way is inserted between the two projecting plate portions 12b of the beam joining bracket in the same manner as the embodiment shown in FIGS. The bolt 14 can be inserted into the bolt hole 12d formed in the portion 12b and the through hole 31c of the joining additional member, and the overhanging plate portion 12b can be tightened with the nut 15.

  In this joining structure, the shaft portion 31b of the convex member and the annular member 22 are coupled via a ring-shaped member 31c interposed therebetween, and the convex member 31 and the annular member 32 are mutually connected. When a strong force is applied in the direction of leaving, both sides leave. However, these are fitted and fixed from both sides of the web 3c, and then tightened between the two overhanging plate portions 12b, whereby the overhanging plate portion 12b is strongly pressed against the head 31b and the annular member 32 of the convex member from both sides. Then, the head 31a and the annular member 32 of the convex member are strongly pressed against both sides of the web 3c and firmly fixed.

In addition, this invention is not limited to embodiment described above, It can implement by changing a shape, a dimension, etc. within the scope of the present invention.
For example, the cross-sectional shape of the head 21b of the large-diameter bolt and the nut 22 for the large-diameter bolt is not limited to a circular outer peripheral surface, but may be a hexagon or other shapes. Further, when the large-diameter bolt 21 and the large-diameter bolt nut 22 are coupled so as to sandwich the web 3c therebetween, the tip of the shaft portion 21a of the large-diameter bolt penetrates the large-diameter bolt nut 22. May protrude. At this time, the projecting plate portion 12b of the beam joint is pressed against the tip surface of the shaft portion 21a. The same applies to the case where the joint addition member 30 composed of the convex member 31 and the annular member 32 is used.
On the other hand, the structure for fixing the beam joint 12 to the wooden beam 2 is not limited to the use of the bolt 13 that penetrates the screw member 11 screwed into the wooden beam 2, and a female screw is formed in the through hole of the screw member, A bolt may be screwed into the female screw. Moreover, what does not use a screw member for a wooden beam, but fixes a beam joining bracket with the volt | bolt which penetrates a wooden beam to a horizontal direction etc. may be sufficient.

DESCRIPTION OF SYMBOLS 1: Wooden pillar, 2: Wooden beam, 2a: Through-hole into which a screw member is screwed, 2b: Recessed part into which the convex part of a beam joining bracket is inserted, 2c: Lateral hole into which a bolt is inserted, 3: Steel beam 3a: upper flange, 3b: lower flange, 3c: web, 3d: hole for attaching the joining additional member, 4: upper floor of the building,
11: Screw member, 12: Beam joint bracket, 12a: Fixed base portion of beam joint bracket, 12b: Overhang plate portion of beam joint bracket, 12c: Convex portion provided on the fixed base portion, 12d: Provided on the overhang plate portion 12e: notches provided in the upper and lower portions of the overhanging plate portion, 13: bolts for fixing the beam joint bracket, 14: bolts for joining the beam joint bracket and the web, 15: nut 16: Joining addition member, 17: Nut,
21: Thick bolt, 21a: Shaft portion, 21b: Head, 21c: Through hole, 22: Nuts for large diameter bolt,
30: Joining addition member, 31: Convex member, 31a: Shaft part, 31b: Head part, 31c: Through-hole, 31d: Ring-shaped member, 32: Annular member

Claims (4)

A beam in which a beam joining bracket is fixed to a side surface of a wooden beam, and an end portion of a steel beam having an upper flange, a lower flange, and a web for vertically connecting them is joined to the wooden beam through the beam joining bracket. A joining structure of
The beam joining bracket includes a fixed base that is fixed in contact with a side surface of the wooden beam, and two projecting plate portions that protrude in the axial direction of the steel beam from both side edges of the fixed base,
The steel beam is formed with a hole penetrating the web at an end portion to be joined with the wooden beam,
A joining addition member having a through hole that is fitted into a hole formed in the web and protrudes on both sides of the web and penetrates between both ends of the protruded web is fixed to the web.
The portion of the web where the joining additional member is fixed is inserted between two projecting plate portions of the beam joining bracket,
Bolts are inserted through bolt holes provided in the overhanging plate portion and through holes formed in the bonding addition member, and the two overhanging plate portions are attached to both ends of the bonding addition member by nuts screwed into the bolts. A beam joining structure characterized by being clamped so as to be pressed. The joining addition member includes a shaft portion that is inserted into a hole formed in the web and a head portion that is locked to a peripheral portion of the hole, and penetrates the shaft portion and the head portion in the axial direction. It has a large-diameter bolt in which a hole is formed and a nut for a large-diameter bolt that is screwed into the large-diameter bolt,
The beam joining structure according to claim 1, wherein a web of the steel beam is sandwiched between a head of the large-diameter bolt and the nut for the large-diameter bolt, and is fastened and fixed. The joining addition member includes a shaft portion that is inserted into a hole formed in the web and a head portion that is locked to a peripheral portion of the hole, and penetrates the shaft portion and the head portion in the axial direction. It has a convex member in which a hole is formed, and an annular member fitted to the outside of the shaft portion,
The beam joining according to claim 1, wherein the steel beam web is sandwiched between the head of the convex member and the annular member, and the joining additional member is fixed to the web. Construction. Fixing a beam joining bracket having a fixed base abutting on a side surface of the wooden beam and two projecting plate portions protruding substantially perpendicularly from both side edges of the fixed base to the side surface of the wooden beam;
At the end of the steel beam having an upper flange, a lower flange, and a web that connects these vertically, a hole penetrating the web is formed,
A first member having a shaft portion inserted into a hole formed in the web and a head portion locked to a peripheral portion of the hole, and having a through hole penetrating the shaft portion and the head portion in the axial direction. And a second member that is attached to the shaft portion of the first member and sandwiches the steel beam web between the first member head and the steel beam web. Protruding and fixed on both sides of the hole formed in,
The portion of the web where the joining additional member is fixed is inserted between two projecting plate portions of the beam joining bracket,
A bolt is inserted into a bolt hole provided in the projecting plate portion and a through hole formed in the joining additional member, and a nut screwed into the bolt is pressed against the two projecting plate members. The method of joining the beams, characterized by tightening so that.

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