JP2005240392A - Beam joint structure and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To join a new beam to an existing beam causing no lowering of tensile strength and rigidity without using a reinforcing hardware inferior in appearance. <P>SOLUTION: In this beam joint structure 1, fitting grooves 4a, 4a united when a pair of beam members 2, 2 abut each other, to form a fit-in hole 5a, are provided at the respective ends of the pair of beam members 2, 2, and fitting grooves 4b, 4b united when the pair of beam members 2, 2 abut each other, to form a fit-in hole 5b, are provided at the respective ends of the pair of beam members 2, 2. In a state of the pair of beam members 2, 2 abutting each other at the end faces, joint plates 3a, 3b are fitted into the fit-in holes 5a, 5b, and the joint plates 3a, 3b are bonded to the pair of beam members 2, 2 to bond the pair of beam members 2, 2 to each other through the joint plates 3a, 3b. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention mainly relates to a beam joining structure and method in a wooden building.

  In homes, there is a need to change the floor plan at the time of new construction, for example, to make a three-dimensional large space by going through the upper and lower floors, due to changes in the family structure and changes in lifestyle.

  In order to meet such needs, renovation work is performed to remove floors and ceilings on the upper and lower floors, but in this case, ceiling beams that were not visible until then are exposed.

  Here, if it is an assumption beam, that is, a beam that is supposed to be shown without being hidden, there is no problem in terms of aesthetics, but the beam exposed by removing the floor and ceiling is originally a function as a structural beam. However, it is almost inferior in terms of aesthetics when compared with members constructed as a manifestation from the beginning of the new construction. Therefore, there is a need to maintain or enhance the aesthetics by replacing the newly exposed beams.

JP-A-11-241422

  However, a beam is often joined to a horizontal member such as a torso or foundation by a traditional joint called a dovetail, or it is often joined to a column by a tenon, and it is extremely difficult to exchange such a beam completely. Have difficulty.

  Therefore, it is only possible to cut the beam extending from the column or horizontal member in the middle and connect the appearing beam to the tip of the beam, but due to the bending moment due to the overload, high tensile strength is required on the lower side of the span center. The

  Therefore, it is difficult to use wood joints, for example, joining wooden beams only by a traditional joining method called sickle joint, because the tensile strength is insufficient, and it is difficult to adopt them with reinforced hardware. When trying to make up for the minute, there was a problem that even the beams that were inferior in aesthetics were further damaged by the unsightly reinforcement hardware.

  The present invention has been made in consideration of the above-described circumstances, and is capable of joining a new beam to an existing beam without lowering the tensile strength and rigidity and without using an aesthetically inferior reinforcement hardware. It is an object of the present invention to provide a bonding structure and method.

  In order to achieve the above object, according to the beam joining structure of the present invention, as described in claim 1, a pair of beam members joined in a state where the end portions are butted together, and the pair of beam members are joined to each other. And a beam ceiling end side at the end of the pair of beam members so as to be integrated as a fitting hole having openings on the beam ceiling end side and the beam lower end side when the pair of beam members are abutted with each other. A fitting groove having an opening is formed on each of the beam lower end side and the beam end face side, and the joining plate is fitted into the fitting hole in a state where the pair of beam members are abutted with each other, and the joining plate and the pair of beams The member is bonded.

  In addition, the beam joining method according to the present invention includes a pair of beam members joined in a state where the end portions are butted together, and a joining plate that joins the pair of beam members to each other. In addition, when the pair of beam members are abutted with each other, the fittings having openings on the beam ceiling end side and the beam end surface side are integrated into the ends of the pair of beam members so as to be integrated as fitting recesses having an opening on the beam ceiling end side. Each of the recesses is formed, and the joining plate is fitted into the fitting recess in a state where the pair of beam members are butted together, and the joining plate and the pair of beam members are bonded.

  In addition, the beam joining method according to the present invention includes a pair of beam members that are brought into contact with each other so that the ends thereof are abutted with each other, and formed at the ends of the pair of beam members, respectively. A beam joining method in which a predetermined joining plate is fitted into a fitting hole or a fitting concave formed by integrating a fitting groove or a fitting concave formed, and bonded to the pair of beam members, the fitting The groove has openings on the beam top end side, the beam lower end side, and the beam end face side, and the fitting recess has openings on the beam top end side and the beam end face side.

  Further, the beam joining method according to the present invention is as described in claim 4, wherein the existing beam is cut and removed at a predetermined location, and the existing beam is fitted to the end portion left without being removed. A new groove member or a fitting concave portion is formed, and a new beam member to be replaced with the removed portion is disposed at the removal position, and the fitting groove or the fitting concave portion formed in the remaining beam member and the new The end face of each beam member abuts so that the fitting groove or fitting recess formed at the end of the beam member is integrated as a fitting hole or fitting recess, and the fitting hole or fitting recess A beam joining method in which a predetermined joining plate is fitted in and bonded to each beam member, wherein the fitting groove has openings on a beam top end side, a beam lower end side and a beam end face side, and the fitting recess Has openings on the beam top end side and beam end face side.

  In the beam joining structure or method of the present invention according to claims 1 to 3, a fitting groove or a fitting recess is formed at each end of a pair of beam members, and the beam members are butted together. Then, the fitting groove or the fitting recess is integrated into a fitting hole or a fitting recess.

  Therefore, a pair of beam members are butted against each other at each end, and then a bonding plate is inserted into and bonded to a fitting hole or fitting recess in which two fitting grooves or two fitting recesses are integrated. If so, the pair of beam members are firmly bonded, and also in the construction surface, it is only necessary to abut the pair of beam members and then insert and bond the bonding plate into the insertion hole or the insertion recess, Workability on site is greatly improved.

  As a construction procedure of such a beam joining method, first, the pair of beam members described above are brought into contact with each other so that their end portions are abutted with each other.

  Next, the joining plate is fitted into a fitting hole or fitting recess formed by integrating fitting grooves or fitting recesses formed respectively at the ends of the pair of beam members.

  When the joining plate is fitted into the fitting groove, the fitting plate is fitted into the fitting hole formed by integrating the fitting groove, so the width is twice the depth of the fitting groove and the thickness is the width of the fitting groove. The height is formed to be the length of the fitting groove (beam formation). On the other hand, when fitted into the fitting recess, the fitting recess is integrated into the fitting recess, so the width is twice the depth from the contact end surface of the fitting recess, and the thickness is fitted The width and height of the recess are formed so as to be the depth of the fitting recess (for example, a dimension shorter by about 20 mm than the beam).

  Next, the bonding plate and the pair of beam members are bonded to each other.

  At this time, the adhesive is applied in advance in the fitting groove or the fitting recess before the pair of beam members are abutted, and after contact, the adhesive is applied to the periphery of the joining plate, and then fitted. It is desirable to insert into the insertion hole or the fitting recess.

  The beam joining structure or method of the present invention according to any one of claims 1 to 3 can be applied to all cases where beams are added in the direction of the material axis, regardless of whether they are newly built or existing. However, the invention according to claim 4 can be applied in particular to the beam addition at the time of reforming.

  That is, when joining a new beam to an existing beam using the beam joining method according to claim 4, first, the existing beam is cut and removed at a predetermined location, and then the existing beam is removed. A fitting groove or a fitting recess is formed in the remaining beam member without being formed.

  Here, the fitting groove has an opening on the beam top end side, the beam lower end side and the beam end surface side, and the fitting recess has an opening on the beam ceiling end side and the beam end surface side, for example, using a circular saw or the like. Can be easily processed and formed.

  Next, a new beam member to be replaced with the removed portion is placed at the removal location. In such an arrangement, the fitting groove or fitting recess formed in the remaining beam member and the fitting groove or fitting recess formed in the end of the new beam member serve as the fitting hole or fitting recess. The ends of the beam members are brought into contact with each other so as to be integrated.

  Next, a predetermined joining plate is fitted into the fitting hole or the fitting concave portion and bonded to each beam member.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a beam joining structure and method according to the present invention will be described below with reference to the accompanying drawings. Note that components that are substantially the same as those of the prior art are assigned the same reference numerals, and descriptions thereof are omitted.

(First embodiment)

  FIG. 1 is an exploded perspective view showing a beam joining structure according to this embodiment, and FIG. 2 is an overall perspective view up to joining. As can be seen from these drawings, the beam joining structure 1 according to the present embodiment is a fitting groove 4a, 4a that integrally forms a fitting hole 5a when the pair of beam members 2, 2 are butted together. Are respectively provided at the end portions of the pair of beam members 2 and 2, and when the pair of beam members 2 and 2 are abutted, the fitting grooves 4b and 4b are integrally formed to form the fitting hole 5b. Is provided at each end of the pair of beam members 2 and 2, and the joining plates 3a and 3b are fitted into the fitting holes 5a and 5b in a state where the pair of beam members 2 and 2 are in contact with each other at the end surfaces. At the same time, by bonding the joining plate and the pair of beam members 2 and 2, the pair of beam members 2 and 2 are joined to each other via the joining plates 3a and 3b.

  Here, the fitting groove 4a and the fitting groove 4b are formed in parallel to each other and in parallel to the material axes of the beam members 2 and 2, and all have openings on the beam top end side, the beam lower end side, and the beam end face side. .

  The joining plates 3a and 3b are so-called hires. For example, the material is hardwood, the thickness is 15 mm, and the height is the same as the height of the beam, that is, the beam formation. In this case, with respect to the fitting groove 4a and the fitting groove 4b, the groove width is 15 mm and the groove length is the same size as the beam. The depth (depth) of the fitting grooves 4a and 4b is preferably 40 mm in relation to the depth that can be cut with a circular saw. In this case, the width of the joining plates 3a and 3b is about 80 mm.

  In the beam joining structure and method according to the present embodiment, the fitting grooves 4a and 4a and the fitting grooves 4b and 4b are formed at the ends of the pair of beam members 2 and 2, respectively. When abutting, these fitting grooves are integrated to form fitting holes 5a and 5b.

  Therefore, the pair of beam members 2 and 2 are abutted at their end portions, and then the joining plates 3a and 3b are respectively inserted into the fitting holes 5a and 5b in which the two sets of fitting grooves are integrated and bonded together. Then, the pair of beam members 2 and 2 are firmly bonded via the bonding plate, and the bonding plates 3a and 3b are fitted on the construction surface after the pair of beam members 2 and 2 are butted together. Since it is sufficient to insert and adhere to the holes 5a and 5b, the workability at the site is greatly improved.

  In the beam joining method according to the present embodiment, first, the pair of beam members 2 and 2 are brought into contact with each other so that their end portions are abutted.

  Next, the joining plates 3a and 3b are fitted into the fitting holes 5a and 5b formed by integrating fitting grooves respectively formed at the end portions of the pair of beam members 2 and 2.

  Next, the joining plates 3a and 3b and the pair of beam members 2 and 2 are bonded to each other.

  At this time, the adhesive is applied in advance into the fitting grooves 4a and 4a or the fitting grooves 4b and 4b before the pair of beam members 2 and 2 are brought into contact with each other. It is desirable to apply an adhesive around the rim and insert it into the fitting holes 5a and 5b.

  As an adhesive to be used, it is possible to appropriately select from any commercially available adhesive. For example, a two-component mixed epoxy resin adhesive marketed under the trade name “Sea Cadure 30” from Nippon Sika Co., Ltd. Agents can be used. Such an adhesive has high viscosity and does not spill, so it has good workability. If it is not in winter, it will develop strength up to about 90% of the final strength in 3 days. There are advantages such as not.

  As described above, according to the beam joining structure and method according to the present embodiment, the pair of beam members 2 and 2 are arranged at the ends where the fitting grooves 4a and 4a and the fitting grooves 4b and 4b are formed. Then, since the joining plates 3a and 3b are inserted and bonded into the fitting holes 5a and 5b in which these two sets of fitting grooves are integrated, the pair of beam members 2 and 2 are firmly joined. In addition, on the construction surface, it is only necessary to abut the pair of beam members 2 and 2 and then insert and bond the joining plates 3a and 3b into the fitting holes 5a and 5b.

  This eliminates the need for complicated joint processing and greatly improves on-site workability.

  Further, according to the beam joining structure and method according to the present embodiment, the beam members 2 and 2 are joined with higher strength and higher rigidity than the traditional joining method by the strong joining with the adhesive.

  That is, in the case of a beam, a large tensile stress is generated on the lower side of the center of the beam due to a bending moment due to an overload, but a high tensile strength is ensured by strong bonding with an adhesive, and there is no concern about cracks.

  Further, for the same reason, it is possible to ensure a much higher bending rigidity than that of mechanical fastening such as bolts, and it is possible to improve the vibration isolation performance of the floor by suppressing the amount of deflection due to the overload.

  In addition, according to the beam joining structure and method according to the present embodiment, the beam members 2 and 2 have substantially the same structural performance as a single object due to the high strength and high bending rigidity described above, and have joints. The total length of the beam members 2 and 2 can be made larger than that of the conventional beam, in other words, it can be used as a beam that spans a greater distance (span) between the columns than the conventional beam.

  Although not particularly mentioned in the present embodiment, as shown in FIG. 3, a stool 11 is provided on the contact end surface of one of the beam members 2 and 2, and an engagement recess 12 that engages with the stool is provided. You may make it provide in the other beam member.

  According to such a configuration, the tensile strength of the beam members 2 and 2 is further improved in combination with the improvement of the tensile strength due to adhesion.

  In order to demonstrate the effect of the method of joining beams according to the present invention, a bending strength test was conducted on three specimens: a single beam without a joint, a beam joined with a conventional sickle joint, and a beam joined according to the present invention. Went. The bending strength test was performed with three types of beam formations of 120 cm, 180 cm, and 240 cm, and the joint position was a position taken out from the column by 240 mm.

  As a result of the test, the bending rigidity of the beam obtained by the joining method according to the present invention and the single bending rigidity were almost equal regardless of the beam formation. Further, although the maximum yield strength varies depending on the beam formation, it has been demonstrated that the beam by the joining method according to the present invention tends to be larger than the beam joined by the sickle joint.

(Second Embodiment)

  Next, a second embodiment will be described. Note that components that are substantially the same as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  FIG. 4 is an exploded perspective view showing a beam joining structure according to this embodiment, and FIG. 5 is an overall perspective view up to joining. As can be seen from these drawings, the beam joining structure 21 according to the present embodiment is formed with fitting recesses 24a and 24a that integrally form a fitting recess 25a when the pair of beam members 2 and 2 are brought into contact with each other. Are respectively provided at the end portions of the pair of beam members 2 and 2, and when the pair of beam members 2 and 2 are abutted with each other, the fitting grooves 24b and 24b are integrally formed to form a fitting recess 25b. Is provided at each end of the pair of beam members 2 and 2, and the joining plates 23a and 23b are fitted into the fitting recesses 25a and 25b in a state where the pair of beam members 2 and 2 are abutted at the ends. By bonding the joining plate and the pair of beam members 2 and 2, the pair of beam members 2 and 2 are joined to each other via the joining plates 23a and 23b.

  Here, the fitting recess 24a and the fitting recess 24b are formed in parallel to each other and in parallel to the material axes of the beam members 2 and 2, and both have openings on the beam top end side and the beam end face side.

  The joining plates 23a and 23b are so-called hire, and can be made of, for example, hardwood, 15 mm thick, and 20 mm shorter than the beam height. In this case, the fitting recess 24a and the fitting recess 24b have a groove width of 15 mm and a depth of the recess that is shallower by about 20 mm than the beam. The depth of the fitting recesses 24a and 24b is preferably 40 mm in relation to the depth that can be cut with a circular saw. In this case, the width of the joining plates 23a and 23b is about 80 mm.

  In the beam joining structure and method according to the present embodiment, the fitting recesses 24a and 24a and the fitting recesses 24b and 24b are formed at the ends of the pair of beam members 2 and 2, respectively. When they are abutted, these fitting recesses are integrated into the fitting recesses 25a and 25b.

  Therefore, the pair of beam members 2 and 2 are abutted at their end portions, and then the joining plates 23a and 23b are respectively inserted and bonded to the fitting recesses 25a and 25b in which the two sets of fitting recesses are integrated. Then, the pair of beam members 2 and 2 are firmly joined via the joint plate, and the pair of beam members 2 and 2 are abutted on the construction surface and the joint plates 23a and 23b are fitted. Since it is sufficient to insert and adhere to the recesses 25a and 25b, the workability on site is greatly improved.

  In the beam joining method according to the present embodiment, first, the pair of beam members 2 and 2 are brought into contact with each other so that their end portions are abutted.

  Next, the joining plates 23a and 23b are fitted into the fitting recesses 25a and 25b formed by integrating the fitting recesses formed at the ends of the pair of beam members 2 and 2, respectively.

  Next, the joining plates 23a and 23b and the pair of beam members 2 and 2 are bonded to each other.

  At this time, the adhesive is applied in advance into the fitting recesses 24a and 24a or the fitting recesses 24b and 24b before the pair of beam members 2 and 2 are brought into contact with each other. It is desirable to apply an adhesive to the surroundings and insert it into the fitting recesses 25a and 25b.

  Since the adhesive used is the same as in the first embodiment, the description thereof is omitted here.

  As described above, according to the beam joining structure and method according to the present embodiment, the pair of beam members 2 and 2 are arranged at the ends where the fitting recesses 24a and 24a and the fitting recesses 24b and 24b are formed. Then, since the joining plates 23a and 23b are inserted and bonded to the fitting recesses 25a and 25b in which these two sets of fitting recesses are integrated, the pair of beam members 2 and 2 are firmly joined. In addition, on the construction surface, it is only necessary to abut the pair of beam members 2 and 2 and then insert and bond the joining plates 23a and 23b into the recessed portions 25a and 25b.

  This eliminates the need for complicated joint processing and greatly improves on-site workability.

  Further, according to the beam joining structure and method according to the present embodiment, the beam members 2 and 2 are joined with higher strength and higher rigidity than the traditional joining method by the strong joining with the adhesive.

  That is, in the case of a beam, a large tensile stress is generated on the lower side of the center of the beam due to a bending moment due to an overload, but a high tensile strength is ensured by strong bonding with an adhesive, and there is no concern about cracks.

  Further, for the same reason, it is possible to ensure a much higher bending rigidity than that of mechanical fastening such as bolts, and it is possible to improve the vibration isolation performance of the floor by suppressing the amount of deflection due to the overload.

  In addition, according to the beam joining structure and method according to the present embodiment, the beam members 2 and 2 have substantially the same structural performance as a single object due to the high strength and high bending rigidity described above, and have joints. The total length of the beam members 2 and 2 can be made larger than that of the conventional beam, in other words, it can be used as a beam that spans a greater distance (span) between the columns than the conventional beam.

  Further, according to the beam joining structure and method according to the present embodiment, the joining plates 23a and 23b are inserted into the fitting recesses 24a and 24ba or the fitting recesses 25a and 25b in which the fitting recesses 24b and 24b are integrated. Therefore, the joining plates 23a and 23b cannot be seen from the floor position.

  As a result, a more excellent aesthetic joint structure is realized.

  Although not particularly mentioned in the present embodiment, as in the first embodiment, the stool 11 shown in FIG. 3 is provided in one beam member, and the engagement recess 12 that engages the stool is provided in the other beam member. It goes without saying that it can be done.

(Third embodiment)

  Next, a third embodiment in which the present invention is applied to reform will be described. In addition, about the components substantially the same as 1st, 2 embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  6 and 7 are work procedure diagrams showing a beam joining method according to the present embodiment. As can be seen in the figure, using the beam joining method according to the present embodiment, the upper floor and the lower floor are blown out, and in order to join a new beam to the existing beam in accordance with the blow-by work, As shown in FIG. 6A, the floor 32 above the existing beam 31 and the ceiling 33 below are removed.

  Next, the existing beam 31 extending from the pillars 34 and 34 is cut at a predetermined location as shown in FIG. 5B, and the cut central portion is removed.

  Next, the fitting grooves 4a and 4a and the fitting grooves 4b and 4b are formed in the beam members 35 and 35 which are left without being removed among the existing beams.

  Here, the fitting grooves 4a and 4a and the fitting grooves 4b and 4b have openings on the beam top end side, the beam lower end side and the beam end surface side, and can be easily processed and formed on site using, for example, a circular saw. it can.

  Next, as shown in FIG. 3C, a new beam member 36 to be replaced with the removed portion is disposed at the removal location. In such an arrangement, the fitting grooves 4a and 4a and the fitting grooves 4b and 4b formed in the remaining beam members 35 and 35, and the fitting grooves 4a and 4a formed at both ends of the new beam member 36, respectively. In addition, the end portions of the beam members are brought into contact so that the fitting grooves 4b and 4b are integrated as fitting holes 5a and 5b.

  Since the new beam member 36 becomes an apparent beam, it may be appropriately configured in consideration of aesthetics.

  Next, the joining plates 3a and 3b are fitted into the fitting holes 5a and 5b as shown in FIG. 7 (a), and then the beam member 36 is turned into the beam member as shown in FIG. 7 (b) and FIG. 7 (c). Adhere to 35, 35.

  As described above, according to the beam joining structure and method according to the present embodiment, the beam member 36 and the beam members 35, 35 are connected to the end where the fitting grooves 4a, 4a and the fitting grooves 4b, 4b are formed. Since the joining plates 3a and 3b are inserted into the fitting holes 5a and 5b in which these two sets of fitting grooves are integrated and bonded together, the beam member 36 and the beam members 35 and 35 are joined. In addition, the beam member 36 and the beam members 35 and 35 are brought into contact with each other, and the bonding plates 3a and 3b need only be inserted into the fitting holes 5a and 5b and bonded. .

  This eliminates the need for complicated joint processing and greatly improves on-site workability.

  Further, according to the beam joining structure and method according to the present embodiment, the beam member 36 and the beam members 35 and 35 are joined with higher strength and higher rigidity than the traditional joining method by the strong joining with the adhesive. Is done.

  In addition, according to the beam joining method according to the present embodiment, since no reinforcement hardware is used at the joining portion, it is excellent in aesthetics, and if the color pattern of the beam member and the joining plate is matched, the joining portion is almost conspicuous. It can be eliminated, and it can be said that it is an excellent method for creating a space to show beams.

The disassembled perspective view of the joining structure of the beam which concerns on 1st Embodiment. The assembly drawing of the joining structure of the beam concerning a 1st embodiment. The disassembled perspective view of the joining method of the beam which concerns on a modification. The disassembled perspective view of the joining structure of the beam which concerns on 2nd Embodiment. The assembly drawing of the junction structure of the beam concerning a 2nd embodiment. The work procedure figure of the junction structure of the beam concerning a 3rd embodiment. The work procedure figure of the junction structure of the beam concerning a 3rd embodiment.

Explanation of symbols

1, 21 Beam joint structure 2, 31, 35, 36 Beam members 3a, 3b, 23a, 23b Joint plates 4a, 4a, 24a, 24b Fitting grooves 5a, 25a Fitting holes 4b, 4b Fitting grooves 5b, 25b Insertion hole 11 Stool 14, 15 Beam member

Claims (4)

It comprises a pair of beam members that are joined in a state where the ends are butted together, and a joining plate that joins the pair of beam members to each other. Fitting grooves having openings on the beam top end side, beam lower end side and beam end surface side are formed at the ends of the pair of beam members so as to be integrated as fitting holes having openings in the pair of beam members, respectively. A joining structure for a beam, wherein the joining plate is fitted into the fitting hole in a butted state, and the joining plate and the pair of beam members are bonded. It consists of a pair of beam members that are joined in a state where the ends are butted together, and a joining plate that joins the pair of beam members to each other, and has an opening on the beam top end side when the pair of beam members are butted together The fitting recesses having openings on the beam top end side and the beam end surface side are respectively formed at the ends of the pair of beam members so as to be integrated as fitting recesses, and the fitting recesses are brought into contact with the pair of beam members. The beam joining structure is characterized in that the joint plate is fitted into the joint plate, and the joint plate and the pair of beam members are bonded together. A pair of beam members are brought into contact with each other so that the ends thereof are abutted with each other, and fitting grooves or fittings formed by integrating fitting grooves or fitting recesses respectively formed at the ends of the pair of beam members are fitted. A beam joining method in which a predetermined joining plate is fitted into a recessed portion and bonded to the pair of beam members, the fitting groove has openings on a beam ceiling end side, a beam lower end side and a beam end face side, The fitting concave portion has openings on the beam top end side and the beam end face side. The existing beam is cut and removed at a predetermined location, and a fitting groove or a fitting recess is formed at the end of the existing beam that is left without being removed, and is replaced with the removed portion. A new beam member is disposed at the removal location, and the fitting groove or fitting recess formed in the remaining beam member and the fitting groove or fitting recess formed in the end of the new beam member are fitted. A method of joining beams in which end faces of the respective beam members are brought into contact with each other so as to be integrated as insertion holes or insertion recesses, and a predetermined joining plate is fitted into the insertion holes or insertion recesses to be bonded to the beam members. The fitting groove has openings on the beam top end side, the beam lower end side and the beam end face side, and the fitting recess has openings on the beam top end side and the beam end face side. Method.

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