JP6713779B2 - Beam-column joint structure and beam-column joining method - Google Patents

Description

The present invention relates to a beam-column joining structure and a beam-column joining method in which a wooden column member and a wooden beam member are joined.

Conventionally, when joining a wooden column member and a wooden beam member, or a wooden beam member incorporating steel, a two-sided shear type column-beam joint structure in which a steel plate is inserted using a pull bolt and a drift pin is generally used. It is used (for example, see Patent Documents 1 and 2). As shown in FIG. 4, this conventional beam-column joint structure has a T-shaped cross section in a plan view through a plurality of through bolts 2 (pull bolts) and nuts 2a that are horizontally inserted through the wooden column member 1. The base plate 3a of the metal member 3 for connecting the beam member is attached to the recess 1a on the side surface of the pillar 1, while the gusset plate 3b of the metal member 3 for connecting the beam member is inserted and arranged in the concave groove portion 4a of the end face of the wooden beam member 4, The gusset plate 3b and the beam member 4 are connected by a joining tool such as a drift pin 5. In the example of the drawing, slab concrete 7 is provided on the upper surface of the beam member 4 via the lag screw bolts 6, and a wooden plug 8 is embedded and arranged on the end side of the drift pin 5, and the concave portion of the side surface of the column member 1 An example is shown in which a heat insulating material 9 such as a mortar bar is arranged at the edge of 1a.

However, in such a beam-column joint structure, there has been a problem that the rigidity and the yield strength are largely decreased due to the joint and the joint efficiency is low. In addition, when planning a frame with more than a certain number of floors, general-purpose details that can be applied to other than through columns are required. To solve the above problem, for example, by using a joint member made of a material harder than wood such as RC (reinforced concrete) joints, the joint efficiency can be significantly increased (for example, Patent Document 3). See). In this case, the connecting member, the upper column member arranged on the upper end surface of the connecting member, and the lower column member arranged on the lower end surface of the connecting member are connected to each other by the groove-in rod (hereinafter , GIR) joining or lag screw bolt (hereinafter sometimes referred to as LSB) joining is effective, but has the following problems.

(In case of GIR bonding)
As shown in FIG. 5(a), GIR bonding of a type in which deformed bar A1 is inserted into wood A2 (glued wood) and fixed with epoxy adhesive A3 is common in many application cases. Since the force of spreading the wood A2 in a concentrated manner acts on the knot portion of A1, it has a brittle property that is likely to undergo splitting fracture.

As shown in FIG. 5(b), the screw portion A41 of the steel rod A4 (rolled screw anchor bolt) including the screw portion A41 and the round steel portion A42 is inserted into the wood A2 and fixed with the epoxy adhesive A3. It has been experimentally confirmed that the type GIR joining is less likely to undergo splitting fracture until the steel rod A4 is sufficiently plastically deformed, resulting in a tough fracture type as shown in FIG. Note that FIG. 6 shows a tensile test result when a steel bar (deformed bar, rolled screw anchor bolt) is fixed to wood having a cross-sectional size of 150 mm×150 mm by GIR bonding for a length of 500 mm.

Particularly in the case of a pillar having a refractory finishing material, performing the work of injecting the GIR epoxy-based adhesive on site requires additional labor because the post-finishing process is increased. Therefore, it is realistic to prepare a wooden pillar member into which a GIR steel rod has already been inserted at a factory or site and only join the steel rods protruding from the upper and lower pillar members in the joint portion during erection. .. However, when using the above-mentioned steel rod having a tough screw shape, there is a problem that there is no general-purpose means for joining steel rods fixed to the upper and lower pillar members.

(In case of LSB bonding)
For the same reason as the above GIR joining, prepare a wooden pillar member with LSB already inserted in the factory or site, and only join the LSB protruding from the upper and lower pillar members in the joint when building. Is realistic. However, there is a problem that there is no general-purpose means for joining the LSBs fixed to the upper and lower pillar members, respectively.

JP 2012-219559 A JP 2012-219560 A JP, 2005-218463, A

Therefore, in the beam-column joint structure of the wooden column member and the beam member, the steel rods or bolts respectively fixed to the column members above and below the joint can be integrally joined without using a mechanical joint. Technology was required.

The present invention has been made in view of the above, and is a column beam capable of integrally joining steel rods or bolts fixed respectively to upper and lower column members of a joint portion without using a mechanical joint. An object is to provide a joint structure and a beam-column joint method.

In order to solve the above-mentioned problems and achieve the object, the beam-column joining structure according to the present invention joins a wooden column member and a wooden beam member through a connecting member made of a material harder than wood. And a projecting metal member provided on the side end surface of the connecting member for connecting to the beam member, and an upper and lower end member provided on the upper and lower end surfaces of the connecting member. A steel member for joining to connect with, a steel rod that is inserted and arranged in the up-down direction in the upper column member and the lower column member, and is attached and fixed thereto, and is joined to the steel member for joining at the end side or And a bolt.

Further, another pillar-beam joint structure according to the present invention is, in the above-mentioned invention, that the steel rod or the bolt has a screw-shaped end portion and is screw-joined to the joining steel member through the end portion. It is a feature.

Further, another beam-column joining structure according to the present invention is the above-mentioned invention, wherein at least one of the upper side column member and the lower side column member and the joining steel frame member are connected from the joining steel frame member to the upper side column member and the lower column member. It is characterized in that a heat-shielding member for shielding heat transfer to at least one of the side pillar members is provided.

Further, another column-beam joint structure according to the present invention is characterized in that, in the above-mentioned invention, the joint member is made of reinforced concrete.

Further, the beam-column joining method according to the present invention is a beam-column joining method for constructing the beam-column joining structure described above, in which steel rods for joining are provided above and below a joint member provided on the upper and lower end surfaces thereof with steel rods. Alternatively, after arranging the upper pillar member and the lower pillar member in which the bolts are inserted and arranged, the end portion side of the steel rod or the bolt and the joining steel frame member are joined.

According to the beam-column joining structure of the present invention, a beam-column joining structure is formed by joining a wooden pillar member and a wooden beam member via a joint member made of a material harder than wood. A protruding metal member provided on the side end surface of the mouth member for connecting to the beam member, a joining steel frame member provided on the upper and lower end surfaces of the joining member for connecting to the upper column member and the lower column member, and the upper side The upper pillar member and the lower pillar member are vertically inserted into the pillar member and the lower pillar member, and are attached and fixed to the pillar member and the steel rod or bolt joined to the joining steel frame member at the end side. The steel rods or bolts that are attached and fixed to the pillar members are integrally joined together through the joining steel members. Therefore, it is possible to integrally join the steel rods or bolts fixed to the upper and lower pillar members, respectively, without using a mechanical joint.

Further, according to the other beam-column joining structure of the present invention, the steel rod or the bolt has a screw-shaped end portion, and since the steel rod or the bolt is screw-joined to the joining steel member via this end portion, the steel rod or the The bolt and the joining steel frame member can be easily joined together.

Further, according to another beam-column joining structure of the present invention, the joining steel frame member to the upper column member and the lower column member are provided between at least one of the upper column member and the lower column member and the joining steel frame member. Since a heat shield member is provided to block the transfer of heat to at least one of the above, in the event of a fire due to the heat shield member, the transfer of heat from the joining steel frame member to at least one of the upper and lower pillar members Is cut off. For this reason, there is an effect that the beam-column joint structure can be a fireproof structure.

Further, according to another beam-column joint structure of the present invention, since the joint member is made of reinforced concrete, there is an effect that the beam-column joint structure can be realized at a relatively low cost.

Further, according to the beam-column joining method according to the present invention, it is a beam-column joining method for constructing the beam-column joining structure described above, in which a joining steel frame member is provided above and below a joint member provided on the upper and lower end surfaces in advance, After arranging the upper column member and the lower column member in which the steel rod or the bolt is inserted and arranged, the end side of the steel rod or the bolt and the steel frame member for joining are joined, so that the above-described beam-column joining structure is relatively performed. It has an effect that it can be easily constructed.

FIG. 1 is a side sectional view showing an embodiment of a beam-column joining structure and beam-column joining method according to the present invention. FIG. 2 is a side view showing the cutting rebar. 3A and 3B are diagrams showing an LSB having a tip screw processed, wherein FIG. 3A is a side view and FIG. 3B is a front view. FIG. 4 is an exploded perspective view showing an example of a conventional beam-column joint structure. 5A and 5B are side cross-sectional views showing GIR joining, where FIG. 5A is a case of deformed rebar and FIG. 5B is a case of a steel rod having a screw shape. FIG. 6 is a diagram showing a load-deformation relationship depending on the type of steel rod.

Embodiments of a beam-column joining structure and a beam-column joining method according to the present invention will be described below in detail with reference to the drawings. The present invention is not limited to this embodiment.

As shown in FIG. 1, a column-beam joint structure 10 according to the present invention includes a wooden column member 12 having a rectangular cross section and a wooden beam member 14 having a rectangular cross section, and a connecting member 16 made of RC. It is a structure formed by joining via. A web 16A (protruding metal member) for connecting to the beam member 14 is provided on the side end surface of the connecting member 16, and a joining steel frame member 16B is provided on the upper and lower end surfaces of the connecting member 16. The upper column member 12A and the lower column member 12B arranged above and below the connection member 16 are connected to each other via the joining steel frame member 16. As described above, in the present embodiment, the joining steel frame members 16B are provided above and below the joint member 16, so that the wooden column member 12 and the joint member 16 can be formed without using a mechanical joint or the like for joining reinforcing bars. Are integrated.

The joining steel frame member 16B is made of H-shaped steel having an H-shaped cross section in plan view, and the base plates 18 and 20 are attached to the upper and lower end surfaces thereof. The joining steel member of the present invention is not limited to the H-section steel, and may be made of, for example, a steel pipe, a square steel pipe, a flat plate, an L-section steel, a channel steel, or a combination thereof. The joining steel frame member 16 is connected to the joint member 16 via the base plate 18, and is connected to the upper column member 12A and the lower column member 12B via the base plate 20.

Steel bars 22 are vertically inserted and arranged at the four corners of the upper column member 12A and the lower column member 12B in a plan view, and are attached and fixed thereto via an epoxy adhesive or the like. The example of the figure shows the case of GIR junction. The steel rod 22 is threaded over the entire length (screw shape) having a tough property that does not easily cause splitting fracture of wood. Since the steel rod 22 has the screw shape, the connection with the joining steel frame member 16B can be easily realized by fastening the nut 24 screwed to the end portion 22a of the steel rod 22 with the base plate 20 interposed therebetween. Note that the steel rod 22 may be formed by using deformed bar. In this case, for example, as shown in FIG. 2, by using the cutting rebar 42 including the cutting screw portion 42A and the deformed rebar portion 42B, details similar to the above can be obtained. The cutting rebar 42 can be obtained by cutting one side of the deformed rebar into a screw shape.

In addition, when the steel rod 22 inserted and arranged in the upper pillar member 12A and the lower pillar member 12B is LSB (LSB joining), it is difficult to integrate it with the joining steel frame member 16B as it is. Therefore, it is preferable to use the LSB with the threaded end portion, which is already generalized as a conventional technique. The end screw may be either a male screw or a female screw. In this case, for example, as shown in FIG. 3, an LSB 44 including a shaft portion 44A that is threaded from the tip portion to the head portion and a hexagonal head portion 44B may be used. By connecting the tip end side inserted and arranged in an insertion hole (not shown) provided in the upper pillar member 12A and the lower pillar member 12B with a screw shape, the connection with the joining steel frame member 16B is performed by sandwiching the base plate 20 and the head of the LSB 44. It can be easily realized by fastening 44B.

Inside the joint member 16, main bars 26 are vertically inserted through the four corners in a plan view, and a plurality of hoop bars 28 are wound around the main bars 26. The main reinforcing bar 26 needs to be integrated with the joining steel frame member 16B, but when a deformed reinforcing bar is used as the main reinforcing bar 26, it is preferable to use a cutting rebar in which both ends 26a are screwed by the method shown in FIG. it can. In this case, it is possible to join them by fastening the nuts 30 screwed to both ends 26a with the base plate 18 interposed therebetween. Further, the main bar 26 may be composed of a long bolt having all screws or screws at both ends.

When the pillar member 12 is a refractory member, heat transfer from the joining steel frame member 16B to the upper surface pillar member 12A and the lower pillar member 12B at the entrance of the fire becomes a problem. Therefore, on the lower end surface of the upper pillar member 12A and the upper end surface of the lower pillar member 12B, a base mortar 32 (shielding material) for blocking heat transfer from the joining steel frame member 16B to the upper pillar member 12A and the lower pillar member 12B is provided. Heat member) is laid. This base mortar 32 also functions as a mortar for adjusting the erection accuracy. Hoop muscles 28 are also provided around the steel rod 22 in the base mortar 32.

The joining member 16 and the beam member 14 are joined by using a steel plate insertion two-face shearing joint detail (see FIG. 4) in which the pull bolt 34 and the drift pin 38 are used in combination. In FIG. 1, reference numeral 36 is a nut and reference numeral 40 is a base plate. Since the connection member 16 is RC, it is possible to prevent a decrease in joining efficiency due to the pull bolt 34 portion, and since the integration with the pull bolt 34 is enhanced, a similar detail can be obtained in a general wooden joint portion. It is possible to expect an increase in joining efficiency as compared with the case of adopting. In order to improve the adhesion performance of the pulling bolt 34 in the connecting member 16, the pulling bolt 34 may be a full threaded bolt or a cutting rebar whose both ends are threaded by the method shown in FIG.

In the above embodiment, the connection member 16 may be PC (precast concrete). In that case, the upper and lower joining steel frame members 16B are preliminarily attached and integrated as a product at a PC factory, and the product is brought into the site and the steel rod 22 is inserted and arranged above and below the connecting member 16. After the column member 12A and the lower side column member 12B are arranged, the above-described beam-column joining structure 10 can be constructed by joining the end portion 22a of the steel rod 22 and the joining steel frame member 16B.

As described above, according to the present embodiment, by using the joining steel frame member 16B, even if the steel rod 22 inserted into the column member 12 is either GIR or LSB, a mechanical joint or the like for reinforcing bar joining can be provided. The integration of the two can be realized without using them. As a result, by securing the rigidity, proof strength, and toughness of the beam-column joint structure 10, it is possible to reduce the seismic resistant elements other than the rigid frame structure and realize a high degree of spatial freedom, and at the same time provide a wooden space with excellent design. It is possible to

In addition, general-purpose technologies already exist for cutting rebars and LSBs with threaded ends. In the present invention, since all the other details can be configured by the existing technology, it is possible to realize a column-beam joint structure with excellent workability and low cost. In addition, since the joining of the joints is clear, it is easy to fit the fireproof specifications such as coating.

As described above, according to the beam-column joining structure according to the present invention, the beam-column joining is made by joining the wooden pillar member and the wooden beam member through the joint member made of a material harder than wood. A projecting metal member provided on the side end surface of the connecting member and connected to the beam member, and a joint provided on the upper and lower end surfaces of the connecting member for connecting the upper column member and the lower column member. Steel frame member, and the upper column member and the lower column member is inserted and arranged in the up-and-down direction, and is attached and fixed here, and since it is provided with a steel rod or bolt joined to the joining steel member at the end side, The steel rods or bolts attached and fixed to the upper column member and the lower column member are integrally joined together through the joining steel frame member. Therefore, the steel rods or bolts respectively fixed to the upper and lower pillar members can be integrally joined without using a mechanical joint.

Further, according to the other beam-column joining structure of the present invention, the steel rod or the bolt has a screw-shaped end portion, and since the steel rod or the bolt is screw-joined to the joining steel member via this end portion, the steel rod or the The bolt and the steel member for joining can be easily joined.

Further, according to another beam-column joining structure of the present invention, the joining steel frame member to the upper column member and the lower column member are provided between at least one of the upper column member and the lower column member and the joining steel frame member. Since a heat shield member is provided to block the transfer of heat to at least one of the above, in the event of a fire due to the heat shield member, the transfer of heat from the joining steel frame member to at least one of the upper and lower pillar members Is cut off. Therefore, the beam-column joint structure can be a fireproof structure.

Further, according to the other beam-column joint structure of the present invention, since the joint member is made of reinforced concrete, the beam-column joint structure can be realized at a relatively low cost.

Further, according to the beam-column joining method according to the present invention, it is a beam-column joining method for constructing the beam-column joining structure described above, in which a joining steel frame member is provided above and below a joint member provided on the upper and lower end surfaces in advance, After arranging the upper column member and the lower column member in which the steel rod or the bolt is inserted and arranged, the end side of the steel rod or the bolt and the steel frame member for joining are joined, so that the above-described beam-column joining structure is relatively performed. It can be easily constructed.

As described above, the beam-column joint structure and beam-column joining method according to the present invention are useful for joining a wooden beam member and a wooden beam member, and are particularly fixed to the column members above and below the joint, respectively. It is suitable for integrally joining steel rods or bolts together without using mechanical joints.

10 Column-beam joint structure 12 Column member 12A Upper side column member 12B Lower side column member 14 Beam member 16 Connection member 16A Web (protruding metal object)
16B Steel member for joining 18,20,40 Base plate 22 Steel rod 22a End part 24,30,36 Nut 26 Main bar 28 Hoop bar 32 Base mortar (heat shield member)
34 Pull Bolt 38 Drift Pin 42 Cutting Rebar (Steel Bar)
42A Cutting screw part 42B Deformed bar part 44 LSB (Lag screw bolt)
44A Shaft 44B Head

Claims (6)

A column-beam joining structure formed by joining a wooden column member and a wooden beam member through a connection member made of a material harder than wood,
Provided on the side end surface of the connecting member, a protruding metal object for connecting with the beam member, and a joining steel member for connecting with the upper and lower column members provided on the upper and lower end surfaces of the connecting member,
The upper pillar member and the lower pillar member are vertically inserted and arranged, and are fixedly attached thereto, and are provided with a steel rod or a bolt joined to the joining steel frame member at the end side ,
The upper and lower end faces of the joining steel members, the base plate is attached, bonding steel members, beam-column joint structure characterized that you have integrated with main reinforcement of the Joint member via the base plate. The beam-column joining structure according to claim 1, wherein the joining steel member is integrated with a main bar which is vertically inserted through the connecting member. The beam-column joint structure according to claim 1 or 2 , wherein the steel rod or the bolt has a threaded end portion, and is threadedly joined to the joining steel frame member via the end portion. A heat shield member for blocking heat transfer from the joining steel frame member to at least one of the upper pillar member and the lower pillar member between at least one of the upper pillar member and the lower pillar member and the joining steel frame member. beam joint structure according to any one of claims 1-3, characterized in that the provided. Joint member Beam joint structure according to any one of claims 1-4, characterized in that it is composed of reinforced concrete. A Column joining method of constructing a beam-column joint structure according to any one of claims 1 to 5,
After arranging the upper pillar member and the lower pillar member, in which the steel rod or the bolt is inserted and arranged, above and below the connecting member in which the joining steel frame member is provided on the upper and lower end surfaces in advance, and the end side of the steel rod or the bolt. A column-beam joining method comprising joining a joining steel frame member.

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