JP2011006972A - Method of reinforcing beam in wooden building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently reinforce an existing beam in refurbishing work.SOLUTION: In the method of reinforcing the beam in the wooden building, first, (201) a strut 4 is vertically arranged near the center of a side face of the existing beam 3 extending between columns 1, 1, and a lower end of the strut is connected to the part near each end of the existing beam 3 via tension members 5, 5. Next, (202) a tensile force is introduced to the tension members 5, 5, and (203) a pipe column 2 is removed. Then, (204) a reinforcing beam 71 is arranged under the existing beam 3, and an upper face of the reinforcing beam is bonded to a lower surface of the existing beam 3. After that, (205) stiffening plates 81, 81 are bonded to side faces of the existing beam 3 and the reinforcing beam 71 in a manner of holding them from both sides. After curing of an adhesive agent, the tensile force introduced to the tension members 5, 5 is released. Then (a step 206) a screw 6 is pulled out and the strut 4 is removed from the existing beam 3. Next, the other end of each of the tension members 5, 5 is disconnected from an eye ring 51 to take the tension members away.

Description

  The present invention relates to a method of reinforcing a beam in a wooden building mainly used for reinforcing a beam of a house.

  In homes, there is a need to secure a large space on the lower floor by changing the floor plan at the time of new construction due to changes in family structure and changes in lifestyle.

  In order to meet such needs, renovation work will be performed to remove the pillars standing near the center of the living room or at the boundary of the adjacent living room, but when the pillars were removed, the tops of the pillars were joined. In addition to the problem that the existing beams bend downward, in some cases, the horizontal rigidity of the column beam frame is lowered, and consequently the earthquake resistance of the entire building is also lowered.

  Therefore, when removing a column, a beam is arranged below the existing beam to which the top of the column is joined (Patent Document 1), and the beam is bonded to the lower surface of the existing beam. The auxiliary pillars are bonded to the pair of pillars that are spanned, and the reinforcing plate is bonded to the joint between the auxiliary pillar and the auxiliary beam (Patent Documents 2 and 3).

  According to such a reinforcing method, the bending rigidity of the existing beam is increased by the beam, and the horizontal rigidity of the column beam frame is also improved by the cooperative action of the beam, the beam, and the reinforcing plate, thus preventing the bending of the existing beam. In addition, the earthquake resistance of the building will be greatly improved.

Japanese Unexamined Patent Publication No. 2005-232678 JP 2008-190169 A JP 2007-270546

  Here, in carrying out the above-described reinforcing method, it is necessary to install a support work in advance before removing the column and temporarily receive a vertical load acting on the column by the support work. If a support work is installed on the beam, there is a problem that the support work cannot be installed below the existing beam because the support work becomes an obstacle.

  On the other hand, in order to avoid such a problem, there is a method in which an existing beam is provisionally received with a predetermined jig before removing the column, the vertical load acting on the column is replaced with the jig, and then the column is removed. Although it has been proposed (Patent Document 4), it has not always been sufficient in terms of efficient renovation work.

  The present invention has been made in consideration of the above-described circumstances, and an object of the present invention is to provide a beam reinforcing method in a wooden building that can efficiently reinforce an existing beam in a renovation work.

  In order to achieve the above object, a beam reinforcing method in a wooden building according to the present invention is as described in claim 1, wherein a bundle member is suspended from a side surface near the center of an existing beam, and the lower end of the bundle member is Connected to each end of the existing beam via a tensile material, introducing a tensile force to the tensile material, removing the column whose top is joined to the lower surface of the existing beam, and attaching a beam below the existing beam Is to be installed.

  Further, in the method for reinforcing a beam in the wooden building according to the present invention, the bundle member is formed in a curved shape or a bent shape, and the bundle member is formed on the existing beam so that the convex side thereof is the side of the existing beam. It is intended to be suspended.

  Further, the beam reinforcing method in the wooden building according to the present invention includes a circular pedestal in which a welding opening is formed in the center and a plurality of insertion holes are formed in an annular shape so as to surround the welding opening, and the welding opening. Through a bolt fitting formed by welding a rear surface of the female screw portion and the opening edge portion, and a female screw portion projecting from the circular pedestal so that a peripheral edge abuts on the opening edge portion of the female screw portion. A tensile member is connected to the vicinity of each end of the existing beam.

  Further, in the method for reinforcing a beam in a wooden building according to the present invention, a bundle member is erected in the vicinity of each end of the existing beam, and the bundle member is connected to the vicinity of the center of the existing beam via a tensile member. Then, a tensile force is introduced into the tensile member, a column having a top part bonded to the lower surface of the existing beam is removed, and a supplementary beam is installed below the existing beam.

  Moreover, the beam reinforcement method in the wooden building which concerns on this invention uses the pillar of the upper floor erected in the vicinity of each edge part of the said existing beam as said bundle material.

  Further, the beam reinforcing method in the wooden building according to the present invention includes a circular pedestal in which a welding opening is formed in the center and a plurality of insertion holes are formed in an annular shape so as to surround the welding opening, and the welding opening. Through a bolt fitting formed by welding a rear surface of the female screw portion and the opening edge portion, and a female screw portion projecting from the circular pedestal so that a peripheral edge abuts on the opening edge portion of the female screw portion. A tension member is connected to the upper end of the bundle member and the vicinity of the center of the existing beam.

  Further, in the method for reinforcing a beam in a wooden building according to the present invention, after the beam is installed, a predetermined stiffening plate is attached to the side surface of the existing beam, and the lower part is attached to the side of the beam. Adhering to each side surface of the existing beam and the auxiliary beam so as to be in contact with the side surface, and after the adhesive used for the adhesion is cured, the tensile force introduced into the tensile material is released to The tension member is removed.

  Further, in the method for reinforcing a beam in a wooden building according to the present invention, after the beam is installed, a support is installed below the beam and the top of the support is brought into contact with the lower surface of the beam. The tensile force introduced into the tension member is released, the tension member is removed, and a predetermined stiffening plate is attached to the side surface of the existing beam and the lower part is set to the side surface of the auxiliary beam. It is bonded to each side surface of the existing beam and the auxiliary beam so as to be in contact with each other.

  In the method of reinforcing a beam in the wooden building according to the present invention, first, a bundle is suspended from the side surface near the center of the existing beam on the target floor where the renovation work is performed, and the lower end of the bundle is set to each end of the existing beam. They are connected in the vicinity via a tensile material, or a bundle material is erected near each end of the existing beam, and the bundle material is connected in the vicinity of the center of the existing beam via a tensile material.

  Next, a tensile force is introduced into the tensile material.

  In this case, the vertical upward component force of the tensile force introduced to the tensile material, that is, the lifting force acts on the existing beam via the bundle material or directly, and this lifting force supports the overload. Thus, the vertical load does not act on the column whose top is joined to the lower surface of the existing beam. This is because a support structure composed of an existing beam, a tensile material, and a bundle material is formed. In the former case where the tensile material is a lower chord material, it is particularly called a stringed beam.

  Next, the above-mentioned pillar is removed, and then a supporting beam is installed below the existing beam.

  In this way, a support structure is newly constructed in the wooden building by adding a tensile material and a bundle to the existing beam on the target floor where the renovation work is to be performed, and the vertical load from the upper floor is supported by this support structure. As a result, it is possible to remove the pillars erected below the existing beams without providing support under the existing beams.

  As described above, there are two support structures. When the upper floor is not removed, a bundle is suspended from the side near the center of the existing beam, and the lower end of the bundle is pulled near each end of the existing beam. Connected via a material (hereinafter referred to as a stringed beam type).

  On the other hand, when removing the upper floor, instead of the above-described procedure, a bundle material is erected in the vicinity of each end of the existing beam, and for example, the upper end of the bundle material is placed near the center of the existing beam. You may make it each connect via (it suspends type hereafter).

  Here, in the stringed beam type, a bundle member is suspended from the side surface near the center of the existing beam, but if the bundle member hinders the column removal work or the attachment work of the beam, the bundle member is bent or What is necessary is just to suspend this bundle material in the existing beam so that the convex side may become the side of the existing beam while forming in a bending shape.

  In this way, the space below the existing beam expands, so when removing the column or installing the beam, the column or beam interferes with the bundle material, or the bundle material interferes with the work. No worries that you can't.

  The tensile material can be removed at an arbitrary timing after the beam is installed.

  That is, when the stiffening plate is bonded to the existing beam and the sub-beam following the installation of the sub-beam, the upper portion of the stiffening plate is in contact with the side surface of the existing beam and the lower portion is in contact with the side surface of the sub-beam. As described above, the stiffening plate is bonded to each side surface of the existing beam and the accessory beam, and after the adhesive used for the bonding is cured, the tensile force introduced into the tensile material is released and the tensile material is removed. be able to.

  In such a case, the tensile material is continuously installed while it is necessary to support the upper load, and the tensile material is removed when the support of the upper load is no longer needed. The support structure is consistently supported, and thus the members, equipment, and construction labor necessary for processing the loading load can be minimized.

  On the other hand, after installing the girder, install a support under the girder, and after receiving the overload at the support, release the tensile force introduced into the tensile material and remove the tensile material Thereafter, the stiffening plate may be bonded to the side surfaces of the existing beam and the supporting beam so that the upper and lower portions of the stiffening plate are in contact with the side surfaces of the existing beam and the supporting beam, respectively.

  In such a case, there will be no problem even if a support is installed after the beam is installed, and there is no tension material on the side of the existing beam or beam at the stage where the stiffening plate is bonded. Therefore, there is no concern that the tensile material and the stiffening plate interfere with each other, and thus the stiffening plate can be smoothly adhered.

  The tension material can be constituted by, for example, a commercially available belt-type load clamping machine.

  Here, the tension material is connected to the lower end of the bundle member suspended near the center of the existing beam in the stringed beam type, and to the lower end of each end of the existing beam in the suspended type. Is connected directly to the center of the existing beam, and the other end is connected to, for example, the upper end of a bundle standing near each end of the existing beam. It is a concept that includes another member located in the vicinity of the end portion, and includes a horizontal horizontal member such as a torso to which an existing beam is joined, for example.

  The fittings and fixtures necessary to connect the tensile member to the existing beam, bundle member or the above-described separate member may be selected as appropriate. For example, a welding opening is formed in the center and surrounds the welding opening. A circular pedestal having a plurality of insertion holes formed in an annular shape, and a female screw portion projecting from the circular pedestal so that a peripheral edge abuts on an opening edge of the welding opening. It is possible to employ a bolt mounting tool that is formed by welding the back surface and the opening edge.

  In order to connect the tension member to the existing beam, the bundle member, or the above-described other member using such a bolt attachment, the back surface of the circular base is brought into contact with the existing beam, the bundle member, or the above-mentioned another member, and the insertion hole is in this state The bolt mounting tool is fixed by screwing a wood screw or a screw passed through, and then the end of the tensile member is screwed to the female thread portion of the bolt mounting tool. If the end of the tension member is not structured to be screwed directly onto the female screw portion, an appropriate bolt member may be interposed.

  In the hanging type, the bundling material may be properly erected on the torso etc., avoiding the position of the upper floor pillars erected in the vicinity of each end of the existing beam. May be used as the bundle.

  In such a configuration, it is not necessary to newly stand the bundle as a separate member, and the work of renovation work can be saved.

The flowchart which showed the implementation procedure of the reinforcement method of the beam in the wooden building which concerns on 1st Embodiment. It is the figure which showed a mode that the bundle material 4 was suspended by the side surface near the center of the existing beam 3, and the lower end of this bundle material was connected to each edge part vicinity of the existing beam 3 via the tension materials 5 and 5, a) is a front view, and (b) is a cross-sectional view along the line AA. It is the figure which showed the bundle material 4, (a) is a front view, (b) is a right view, (c) is sectional drawing along the BB line. The whole perspective view of the bolt attachment tool 8. FIG. It is a figure of the bolt attachment tool 8, (a) is a disassembled perspective view, (b) is sectional drawing. Sectional drawing which showed the attachment condition of the bolt attachment tool 8. FIG. It is the figure which showed a mode that the accessory beam 71 was installed, (a) is a front view, (b) is sectional drawing along CC line. It is the figure which showed a mode that the stiffening board 81 was installed, (a) is a front view, (b) is sectional drawing along DD line. The front view which concerns on a modification. The flowchart which showed the implementation procedure of the reinforcement method of the beam in the wooden building which concerns on 2nd Embodiment. The front view which showed a mode that the bundle materials 111 and 111 were stood near each edge part of the existing beam 3, and this bundle material was connected to the side surface near the center of the existing beam 3 via the tension materials 5 and 5. FIG. The front view which showed a mode that the splicing beam 71 and the stiffening board 81 were installed.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a beam reinforcing method in a wooden building according to the present invention will be described 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 a flowchart showing an execution procedure of a beam reinforcing method in a wooden building according to the present embodiment. In the beam reinforcement method according to the present embodiment, as shown in FIG. 2, first, after dismantling and removing the ceiling (not shown) on the target floor on which the renovation work is performed, in the first floor, The bundle member 4 is suspended from the side surface in the vicinity of the center of the existing beam 3 laid over 1, and the lower end of the bundle member is connected to the vicinity of each end portion of the existing beam 3 via the tension members 5 and 5 (step 201). ).

  Here, the pipe column 2 is erected between the columns 1 and 1, and the top portion is joined to the lower surface of the existing beam 3, so that the tube column bears a part of the loading load from the second floor. However, in the present embodiment, an example in which the present invention is applied to the removal of the pipe column 2 and the reinforcement work of the existing beam 3 associated therewith will be described.

  As shown in FIG. 3, the bundle member 4 includes a bundle member body 31 composed of two groove members 31 a and 31 b that are formed by bending the grooved steel around the weak axis and toward the flange as a whole. Among the groove-shaped members, screw holes 33 are formed in the web 32a of the groove-shaped member 31a having a short material axial direction length, and the back surface of the web is in contact with the side surface near the center of the existing beam 3. By inserting and screwing the screw 6 into the screw hole 33, it can be suspended from the existing beam 3 as shown in FIG.

  On the other hand, an elliptical plate 34 is welded to the web 32b of the groove-shaped member 31b having a long length in the material axis direction on the back side of the tip, and both sides of the elliptical plate from the flange surface of the groove-shaped member 31b. The projecting portions 36, 36 extending in the direction are formed with round holes 35, 35 on which the tip ends of the tension members 5 are hooked.

  The bundle material body 31 includes, for example, two channel steels having a cross section with a web height of 100 mm, a flange width of 50 mm, and a thickness of about 3.2 mm, and a member length of about 100 mm and about 650 mm. The short side may be a groove-shaped member 31a and the long side may be a groove-shaped member 31b so as to be non-parallel to each other and bent to the flange side, and the long side may be a groove-shaped member 31b. It is also possible to manufacture a grooved steel of about 750 mm by bending it at a location of about 100 mm from its end.

  As shown in FIG. 2 (b), the bundle member 4 manufactured in this way is suspended from the existing beam 3 so that the convex side (outer side) formed in a bent shape becomes the side of the existing beam 3. Thus, even when the bundle 4 is attached to the existing beam 3, the tube column 2 can be removed smoothly.

  The bending angle θ of the bundle body 31 may be determined as appropriate so that the tube column 2 can be smoothly removed without interfering with the bundle 4 attached to the existing beam 3, for example, about 5 °. Can be set to

  As the tension member 5, for example, a belt-type load-clamping machine can be adopted, and specifically, a machine-clamping machine sold under the trade name “Rock Sling” (registered trademark) by Meidai Co., Ltd. Can be adopted.

  As described above, the tension member 5 is stretched between the lower end of the bundle member 4 and the vicinity of each end of the existing beam 3, and the right end of the tension member 5 located on the left side in FIG. The portion is hooked in the left circular hole 35 formed in the elliptical plate 34 of the bundle 4 and the left end of the tensile member 5 located on the right is formed in the elliptical plate 34 of the bundle 4. It is hooked in the right round hole 35.

  In addition, each end of the existing beam 3 is joined to a case 7 as a horizontal horizontal member arranged orthogonal to the existing beam, but the tension member 5 located on the left side is bolted to the left end. The tensile member 5 located on the right side is connected to the left side case 7 via a tool 8, and the right end thereof is connected to the right side case 7 via a bolt attachment 8.

  As shown in FIGS. 4 and 5, the bolt attachment 8 is a circular base in which a hexagonal welding opening 45 is formed in the center and a plurality of insertion holes 43 are formed in an annular shape so as to surround the welding opening. 41 and a nut 42 as a female thread portion protruding from the circular pedestal 41 so that the peripheral edge abuts on the opening edge 44 of the welding opening 45, and the back surface and the opening edge of the nut 42 The nut 42 is firmly fixed to the circular pedestal 41 by applying a weld 46 as a fillet joint or a lap joint between them 44.

  The specifications of the welding opening 45 are appropriately specified together with the dimensions of the nut 42 and the circular base 41 so that necessary and sufficient welding can be performed between the opening edge 44 of the welding opening and the back surface of the nut 42. Should be set.

  In order to connect and fix the end of the tension member 5 to the barrel 7 using the bolt fixture 8, the bolt fixture 8 is connected to the side of the barrel 7 with the back of the circular base 41 as shown in FIG. 6. The screw 52 is inserted into the insertion hole 43 and screwed into the barrel 7 to be fixed to the barrel, and then an eye ring 51 as a bolt member is screwed onto the nut 42. The end of the tension member 5 may be hooked on the eye ring.

  Next, a tensile force is introduced into the tensile members 5 and 5 (step 202).

  The introduction of the tensile force may be appropriately operated according to the specifications and structure of the tensile material 5.

  In this way, since the existing beam 3, the tensile members 5, 5 and the bundle member 4 constitute a stringed beam, the vertical upward component of the tensile force introduced into the tensile member 5, that is, the so-called push-up force is transmitted via the bundle member 4. It acts on the existing beam 3, and this lifting force supports the overload applied to the tube column 2, and the vertical load does not act on the tube column 2.

  If the overload applied to the pipe column 2 is replaced by the stringed beam made up of the existing beam 3, the tensile members 5, 5 and the bundle member 4, the tube column 2 is then removed (step 203). .

  In removing the pipe column 2, the bundle 4 suspended from the existing beam 3 extends obliquely downward from the existing beam 3 at an angle of 5 °, for example, as described above. It is away from. Therefore, the removal work of the pipe pillar 2 can be smoothly advanced in the state where the bundle 4 is left.

  Next, as shown in FIG. 7, the beam 71 is disposed below the existing beam 3, and the upper surface of the beam is bonded to the lower surface of the existing beam 3 (step 204).

  Next, as shown in FIG. 8, the stiffening plates 81 and 81 are bonded to the side surfaces so as to sandwich the existing beam 3 and the accessory beam 71 from both sides (step 205). The stiffening plates 81 are bonded to the side surfaces of the existing beam 3 and the supporting beam 71 so that the upper portion thereof is in contact with the side surface of the existing beam 3 and the lower portion is in contact with the side surface of the supporting beam 71.

  Next, after the adhesive is cured, the tensile force introduced into the tensile members 5 and 5 is released, and then the screw 6 is pulled out to remove the bundle member 4 from the existing beam 3 and the other tensile members 5 and 5. The tensile material is removed by removing the end from the eye ring 51 (step 206).

  In addition, the removed tension | pulling material 5 and the bundle material 4 can be diverted suitably to another construction site. Also, since the bolt attachment 8 attached to the torso 7 and the eye ring 51 screwed thereto are installed in the ceiling pocket, there is no problem even if they are left, but if they are removed, As with the tension member 5 and the bundle member 4, it can be reused.

  As described above, according to the beam reinforcing method in the wooden building according to the present embodiment, the wooden building is obtained by adding the tensile members 5, 5 and the bundle member 4 to the existing beam 3 on the first floor where the renovation work is performed. Since a stringed beam as a support structure was newly built inside, and the vertical load from the second floor was supported by the stringed beam, the pipe column 2 on the first floor was removed without providing a support under the existing beam 3. It becomes possible to do.

  In addition, according to the method of reinforcing a beam in a wooden building according to the present embodiment, the support structure to be newly constructed in the wooden building is a stringed beam. There is no need to change anything. Therefore, it is possible to proceed with the renovation work more efficiently.

  Further, according to the beam reinforcing method in the wooden building according to the present embodiment, the bundle material 4 is formed in a bent shape, and the bundle material is used so that the convex side thereof becomes the side of the existing beam 3. Since the lower space of the existing beam 3 is expanded, the pipe column 2 and the beam 71 interfere with the bundle material 4 when the tube column 2 is removed and the beam 71 is installed. This eliminates the concern that the bundle 4 is in the way and the work cannot be performed.

  Further, according to the beam reinforcing method in the wooden building according to the present embodiment, the upper part of the stiffening plate 81 is in contact with the side surface of the existing beam 3 and the lower part is in contact with the side surface of the beam 71. The stiffening plate is bonded to each side surface of the existing beam 3 and the accessory beam 71, and after the adhesive used for the bonding is cured, the tensile force introduced into the tensile materials 5 and 5 is released to release the tensile material. Since the tension members 5 and 5 are continuously installed while the support of the overload is necessary, the tension members 5 and 5 are removed when the support of the overload becomes unnecessary. Therefore, during the renovation work, it is possible to consistently support the upper load with the stringed beam, and thus it is possible to minimize the members and equipment necessary for processing the upper load or the labor of the work.

  Further, according to the beam reinforcing method in the wooden building according to the present embodiment, the bolt attachment 8 is arranged so that the back surface of the circular pedestal 41 is in contact with the side surface of the trunk 7, and the insertion hole 43. Since the screw 52 inserted into the screw is screwed into the barrel and the tensile member 5 is connected to the eye ring 51 screwed into the nut 42, the tensile member 5 and the barrel 7 are connected with sufficient tensile strength. Thus, the vertical load from the second floor can be reliably supported by the string beam including the tension members 5 and 5.

  In the present embodiment, the other end of the tension member 5 is connected to the barrel 7 via the bolt attachment 8 and the eye ring 51 screwed thereto. The structure to connect is arbitrary and it replaces with this structure and can employ | adopt well-known connection means suitably.

  In the present embodiment, the other end of the tension member 5 is connected to the side surface of the trunk 7 located in the vicinity of the end of the existing beam 3, but instead of this, the end of the existing beam 3, for example, You may connect with a side surface or a lower surface.

  In this embodiment, the bundle member 4 is formed in a bent shape. However, instead of this, the bundle member 4 may be formed in a curved shape, and there is no problem in removing the tube column 2 or installing the beam 71. For example, instead of such a configuration, a straight steel material may be used. Needless to say, the bundle material can be made of other steel materials such as H-shaped steel.

  In this embodiment, the bundle member 4 is attached only to one side surface of the existing beam 3, but instead, the bundle member is attached to both side surfaces of the existing beam, and the lower end of each bundle member is attached. You may make it connect through the tension | tensile_strength material near each edge part of the existing beam.

  According to such a configuration, the symmetry of the load when viewed from the beam axis direction of the existing beam 3 is ensured, and it becomes possible to more securely and safely support the upper load. In addition, the structure which attaches the bundle material 4 only to one side surface of the existing beam 3 like this embodiment, since the existing beam 3 is arrange | positioned in the position equivalent to a trunk, ie, a building outer peripheral part, it is on the back side. This is an advantageous configuration when the bundle 4 cannot be installed.

  In the present embodiment, as a measure for reinforcing the existing beam 3, the beam 71 is bonded to the lower surface of the existing beam 3 and the stiffening plates 81 and 81 are bonded to both side surfaces of the existing beam 3 and the beam 71. However, the stiffening plate 81 may be omitted if both can be integrated by simply bonding the upper surface of the beam 71 to the lower surface of the existing beam 3.

  Further, in the present embodiment, the description has been made on the assumption that the stiffening plate 81 can be attached even when the tension member 5 is installed. However, the stiffening plate 81 may be attached due to the tension member 5 being in the way. When it is difficult or the work efficiency is poor, as shown in FIG. 9, after installing the beam 71, a support 91 is installed so that the top part comes into contact with the lower surface thereof, and the support is mounted on the support. It is also possible to replace the load and, after that, loosen the tension member 5 and remove it, and then attach the stiffening plate 81 in the same manner as described above.

  In such a configuration, there is no problem even if the support 91 is installed after the beam 71 is installed, and at the stage where the stiffening plate 81 is bonded, the tensile material 5 is formed on the side of the existing beam 3 and the beam 71. Is not stretched, there is no concern that the tension member 5 and the stiffening plate 81 interfere with each other, and thus the stiffening plate 81 can be adhered smoothly.

(Second Embodiment)

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

  FIG. 10 is a flowchart showing an execution procedure of the beam reinforcing method in the wooden building according to the present embodiment. In the beam reinforcement method according to the present embodiment, first, as shown in FIG. 11, the upper floor of the target floor (the first floor in the present embodiment) on which the renovation work is performed, the second floor in the present embodiment is removed, and then The bundle members 111 and 111 are erected in the vicinity of each end of the existing beam 3 spanned between the columns 1 and 1, and the upper end of the bundle member is placed near the center of the existing beam 3 via the tension members 5 and 5. Are connected to each other (step 301).

  Here, the pipe column 2 is erected between the columns 1 and 1, and the top portion is joined to the lower surface of the existing beam 3, so that the tube column bears a part of the loading load from the second floor. However, in the present embodiment, an example in which the present invention is applied to the removal of the pipe column 2 and the reinforcement work of the existing beam 3 associated therewith will be described.

  The bundle material 111 is erected on the upper surfaces of the trunks 7 and 7 to which the ends of the existing beams 3 are joined, and can be made of wood having a cross section similar to that of the pillar 1, for example. In addition, when the upper floor pillar exists in the same plane position as the pillar 1, the standing material position of the upper floor pillar may be avoided and the bundle material 111 may be erected on the side of the upper floor pillar.

  As described above, the tension member 5 is stretched between the upper ends of the bundle members 111 and 111 and the vicinity of the center of the existing beam 3, but the tension member 5 located on the left side in FIG. The end is connected to the side surface near the center of the existing beam 3, and the left end is connected to the upper end of the left bundle 111 through a bolt attachment 8.

  Similarly, with respect to the tension member 5 located on the right side in FIG. 11, its left end is on the side near the center of the existing beam 3, and the right end is on the upper end of the right bundle 111 via the bolt attachment 8. It is connected.

  The connecting procedure using the bolt attachment 8 is the same as that of the first embodiment, and the bolt attachment 8 is arranged such that the back surface of the circular pedestal 41 is brought into contact with the side surface of the existing beam 3 or the upper end side surface of the bundle material 111. In addition, the screw 52 is inserted into the insertion hole 43 and screwed into the existing beam 3 or the bundle material 111. Then, the eye ring 51 is screwed onto the nut 42, and the tensile material 5 is attached to the eye ring. What is necessary is just to hook an edge part.

  Next, a tensile force is introduced into the tensile members 5 and 5 (step 302).

  In this way, the vertical upward component force of the tensile force introduced into the tensile member 5, that is, the pushing force acts on the existing beam 3, and the pushing force supports the overload applied to the pipe column 2, A vertical load does not act on the tube column 2.

  If the mounting load acting on the tube column 2 is replaced by the support structure composed of the existing beams 3, the tensile members 5, 5 and the bundle members 111, 111, the tube column 2 is then removed ( Step 303).

  Next, as shown in FIG. 12, the beam 71 is disposed below the existing beam 3, and the upper surface of the beam is bonded to the lower surface of the existing beam 3 (step 304).

  Next, the stiffening plates 81 and 81 are bonded to the side surfaces so as to sandwich the existing beam 3 and the accessory beam 71 from both sides (step 305). The stiffening plates 81 are bonded to the side surfaces of the existing beam 3 and the supporting beam 71 so that the upper portion thereof is in contact with the side surface of the existing beam 3 and the lower portion is in contact with the side surface of the supporting beam 71.

  Next, after the adhesive is cured, the tensile force introduced into the tensile members 5 and 5 is released, and then the tensile members 5 and 5 are removed from the eye ring 51 by removing both ends of the tensile members 5 and 5 ( Step 306).

  As described above, according to the method of reinforcing a beam in the wooden building according to the present embodiment, by adding the tensile members 5 and 5 and the bundle members 111 and 111 to the existing beam 3 on the first floor where the renovation work is performed, Since a new support structure was built in the building, and the vertical load from the second floor was supported by the support structure, the pipe pillar 2 on the first floor was removed without providing a support under the existing beam 3. It becomes possible to do.

  Further, according to the beam reinforcing method in the wooden building according to the present embodiment, the upper part of the stiffening plate 81 is in contact with the side surface of the existing beam 3 and the lower part is in contact with the side surface of the beam 71. The stiffening plate is bonded to each side surface of the existing beam 3 and the accessory beam 71, and after the adhesive used for the bonding is cured, the tensile force introduced into the tensile materials 5 and 5 is released to release the tensile material. Since the tension members 5 and 5 are continuously installed while the support of the overload is necessary, the tension members 5 and 5 are removed when the support of the overload becomes unnecessary. Therefore, during the renovation work, it is possible to consistently support the upper load with the above-described support structure, and thus it is possible to minimize the members, equipment, and work required for the processing of the upper load.

  Further, according to the beam reinforcing method in the wooden building according to the present embodiment, the bolt attachment 8 is arranged such that the back surface of the circular pedestal 41 is brought into contact with the side surface of the existing beam 3 or the upper end side surface of the bundle material 111. The screw 52 inserted into the insertion hole 43 is screwed into the existing beam 3 and the bundle material 111 and the tensile material 5 is connected to the eye ring 51 screwed into the nut 42. And the bundle material 111 can be connected with sufficient tensile strength, and thus the vertical load from the second floor can be reliably supported by the support structure including the tensile materials 5 and 5.

  In this embodiment, the tension member 5 is connected to the side surface of the existing beam 3 and the upper end side surface of the bundle member 111 through the bolt attachment 8 and the eye ring 51 screwed to the bolt attachment device 8. The structure to be connected to is arbitrary, and instead of such a structure, a well-known connecting means can be appropriately employed.

  Further, in the present embodiment, the bundle members 111, 111 are erected on the trunk 7 that avoids the column position on the upper floor. However, instead of this, the pillar on the upper floor may be used as the bundle member. Good.

  In such a configuration, it is not necessary to newly stand the bundle as a separate member, and the work of renovation work can be saved.

  Further, in this embodiment, the tension members 5 and 5 are stretched only on one side of the existing beam 3, but in addition, the tension members 5 and 5 are stretched on the other side. It doesn't matter if you do.

  According to such a configuration, the symmetry of the load when viewed from the beam axis direction of the existing beam 3 is ensured, and it becomes possible to more securely and safely support the upper load. In addition, the structure which stretches the tension members 5 and 5 only on one side of the existing beam 3 as in the present embodiment is arranged at the position corresponding to the waistline, that is, the outer periphery of the building. Therefore, this is an advantageous configuration when the tension members 5 and 5 cannot be stretched on the back side.

  In the present embodiment, as a measure for reinforcing the existing beam 3, the beam 71 is bonded to the lower surface of the existing beam 3 and the stiffening plates 81 and 81 are bonded to both side surfaces of the existing beam 3 and the beam 71. However, the stiffening plate 81 may be omitted if both can be integrated by simply bonding the upper surface of the beam 71 to the lower surface of the existing beam 3.

  Further, in the present embodiment, the description has been made on the assumption that the stiffening plate 81 can be attached even when the tension member 5 is installed. However, the stiffening plate 81 may be attached due to the tension member 5 being in the way. If it is difficult or the work efficiency is poor, as described with reference to FIG. 9, after installing the beam 71, a support 91 is installed so that the top part comes into contact with the lower surface thereof. It is also possible to attach the stiffening plate 81 in the same manner as described above after changing the loading load and then loosening and removing the tension member 5.

  In such a configuration, there is no problem even if the support 91 is installed after the beam 71 is installed, and at the stage where the stiffening plate 81 is bonded, the tensile material 5 is formed on the side of the existing beam 3 and the beam 71. Is not stretched, there is no concern that the tension member 5 and the stiffening plate 81 interfere with each other, and thus the stiffening plate 81 can be adhered smoothly.

2 Pillars to be removed 3 Existing beams 4 Bundles 5 Tensile materials 7 Torso (horizontal horizontal members)
8 Bolt fitting 41 Circular base 42 Nut (Female thread)
43 Insertion hole 44 Opening edge 45 Welding opening 46 Welding 51 Eyring (bolt member)
71 Beams 81 Stiffening plates 91 Supports 111 Bundles

Claims (8)

A bundle member is suspended from the side surface near the center of the existing beam, the lower end of the bundle member is connected to each end portion of the existing beam via a tensile member, and a tensile force is introduced into the tensile member. A method of reinforcing a beam in a wooden building, comprising removing a column having a top part bonded to the lower surface of the frame and installing a beam below the existing beam. The method of reinforcing a beam in a wooden building according to claim 1, wherein the bundle member is formed in a curved shape or a bent shape, and the bundle member is suspended from the existing beam so that a convex side thereof is on the existing beam side. . A circular pedestal in which a plurality of insertion holes are formed in an annular shape so that a welding opening is formed in the center and surrounds the welding opening, and a peripheral edge abuts on the opening edge of the welding opening. The tension member is connected to the vicinity of each end of the existing beam through a bolt mounting tool configured by welding a back surface of the female screw portion and the opening edge portion. A method for reinforcing a beam in a wooden building according to claim 1. A bundle member is erected near each end of the existing beam, the bundle member is connected to the vicinity of the center of the existing beam via a tensile member, a tensile force is introduced into the tensile member, and the existing beam A method for reinforcing a beam in a wooden building, comprising removing a column whose top is joined to a lower surface and installing a beam below the existing beam. The method of reinforcing a beam in a wooden building according to claim 4, wherein an upper-floor column erected in the vicinity of each end of the existing beam is used as the bundle. A circular pedestal in which a plurality of insertion holes are formed in an annular shape so that a welding opening is formed in the center and surrounds the welding opening, and a peripheral edge abuts on the opening edge of the welding opening. The tension member is formed on the upper end of the bundle member and near the center of the existing beam through a bolt fitting formed by welding a back surface of the female screw portion and the opening edge portion. The method of reinforcing a beam in a wooden building according to claim 4 or 5, wherein the beams are connected to each other. After installing the beam, a predetermined stiffening plate is attached to the existing beam and the beam so that the upper part is in contact with the side surface of the existing beam and the lower part is in contact with the side surface of the beam. The adhesive according to any one of claims 1 to 6, wherein the tensile material introduced into the tensile material is released and the tensile material is removed after the adhesive is bonded to each side surface and the adhesive used for the adhesion is cured. Of reinforcing beams in wooden buildings. After installing the beam, a support is installed below the beam, the top of the support is brought into contact with the lower surface of the beam, and the tensile force introduced into the tension member is released. The tension member is removed and a predetermined stiffening plate is placed on each side surface of the existing beam and the supporting beam so that an upper portion thereof is in contact with a side surface of the existing beam and a lower portion thereof is in contact with a side surface of the auxiliary beam. A method of reinforcing a beam in a wooden building according to any one of claims 1 to 6, wherein the beam is bonded to each other.

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