JP5918971B2 - Method for constructing reinforcing wall for reinforcing existing shaft and reinforcing wall for reinforcing existing shaft - Google Patents

Description

  The present invention relates to a method for constructing a reinforcing wall that reinforces an existing shaft and a reinforcing wall that reinforces an existing shaft, and more particularly to a method for constructing a reinforcing wall that can be effectively applied to an existing wooden building, and a reinforcing wall. .

  As shown in the front view of FIG. 5, a traditional wooden building in a shrine or the like has a pair of column members 1, 1 and a pair of upper and lower horizontal members 3, 3 spanned between the pair of column members 1, 1. As a shaft set 5, and in some cases, a plate wall 311 may be provided inside the shaft set 5. And when this board wall 311 is provided, for example, each edge part 311a, 311a, 311b of the board wall 311 in the groove parts 1t, 3t provided in the pillars 1 and 1 and the horizontal members 3 and 3 is provided. , 311b are inserted, the plate wall 311 is fixed to the shaft assembly 5.

  Here, the plate wall 311 is configured by combining a plurality of strip-shaped plate materials 315, 315,... For reasons such as generally difficult to secure a large single plate. For example, these plate members 315, 315... Are aligned in the vertical direction (vertical direction) by bringing the adjacent plate members 315, 315 into contact with each other at the small ends 315k, 315k while aligning the longitudinal direction thereof in the horizontal direction. The direction is aligned with the direction). Further, dowels 321, 321... Are provided at the small end 315 k which is the upper end surface 315 u and the lower end surface 315 d of each plate member 315, so that the longitudinal direction (horizontal in the illustrated example) of the adjacent plate members 315, 315 is provided. Direction) relative movement is regulated (see Patent Document 1).

JP 2000-248640 A

  Such a plate wall 311 functions as a seismic wall during an earthquake. Therefore, in order to increase the earthquake resistance of the building, it is effective to increase the number of walls. That is, as an example of the earthquake-resistant repair method, it is possible to add a plate wall 311 in the room of the building. However, in a traditional wooden building, a frame with few partitions is desired from the viewpoint of openness and the like, and it becomes difficult to meet this demand as the number of walls increases.

On the other hand, the seismic resistance can also be improved by increasing the proof stress per sheet wall. And according to this, the earthquake resistance of a building can be improved, without increasing the number of walls.
Therefore, when the applicant of the present application diligently examined the proof strength of the plate wall 311, a plurality of plate materials 315, 315... Are aligned and arranged with the vertical direction as the alignment direction while aligning the longitudinal direction of the plate material 315 in the horizontal direction as described above. In this case, the horizontal strength of the plate wall 311 is better when the horizontally long dowel 21 (see, for example, FIG. 2A) is used than when the vertically long dowel 321 as shown in FIG. It has been found that can be improved significantly. Further, a patent application has already been filed for the plate wall 11 in which the plate members 15, 15...

  In addition, the applicant of the present application can improve the proof stress of the plate wall 111 by connecting the plate members 115 and 115 with a fitting (meshing) structure without using the horizontally long dowel 21 as described above. As a result, a patent application has already been filed for the plate wall 111 using such a fitting structure (see, for example, FIG. 11A).

  However, when the plate wall 11 using the horizontally long dowel 21 or the plate wall 111 using the fitting structure as described above is applied to the existing frame 5 of the existing building as a reinforcing wall, the plate wall 11 (111). In order to ensure that stress is transmitted between the existing shaft assembly 5 and the existing shaft assembly 5, a fitting structure such as a tenon is provided in the groove portions 1t, 3t such as large slots and the plate wall 11 (111) is attached to the existing shaft assembly 5. Although it is necessary to fix firmly, in that case, when the plate wall 11 (111) is attached to the existing shaft assembly 5, the work of inserting the mortise into the mortise becomes indispensable. There was a problem in terms of construction period and cost.

  Further, such a problem is constituted by a plate wall other than the plate wall 11 (111) formed by connecting a plurality of plate members 15, 15... (115, 115...) By a dowel 21 or a fitting structure, that is, a single plate. There was also a common problem that could occur when a plate wall was additionally installed on the existing shaft set 5 as a reinforcing wall.

  The present invention has been made in view of the conventional problems as described above, and its purpose is to construct a reinforcing wall inward of an existing shaft, without disassembling the existing shaft. The purpose is to construct a reinforcing wall capable of reliably transmitting stress to an existing shaft.

The invention shown in claim 1
A method for constructing a reinforcing wall that reinforces an existing shaft assembly having a pair of existing column members and a pair of upper and lower existing horizontal members spanned between the pair of existing column members,
A reinforcing plate wall forming step of forming a reinforcing plate wall forming the main body of the reinforcing wall;
A reinforcing wall forming step of forming the reinforcing wall by fixing a peripheral frame member to the end face so as to cover the entire end face of the reinforcing plate wall;
Reinforcing wall fitting step of fitting the reinforcing wall into the inside of the existing shaft set while contacting the inner peripheral surface of the existing shaft set;
In a state in which the reinforcing wall is fitted inward of the existing shaft set, a plurality of penetrating members penetrate through both the peripheral frame member and the existing shaft set in the circumferential direction of the peripheral frame member. A reinforcing wall fixing step performed over the entire circumference ,
In the reinforcing wall forming step, the peripheral frame member is fixed to the end surface via a fitting structure so that relative movement in the circumferential direction between the end surface and the peripheral frame member is restricted at least.
The reinforcing plate wall has a plurality of plate materials,
The plurality of plate members are arranged so that the longitudinal direction of each plate member is aligned,
Of the end surfaces, the length of the fitting structure provided on the end surface along the longitudinal direction is not less than the length in the direction orthogonal to the longitudinal direction .

The invention shown in claim 2
A method for constructing a reinforcing wall that reinforces an existing shaft assembly having a pair of existing column members and a pair of upper and lower existing horizontal members spanned between the pair of existing column members,
A reinforcing plate wall forming step of forming a reinforcing plate wall forming the main body of the reinforcing wall;
A reinforcing wall forming step of forming the reinforcing wall by fixing a peripheral frame member to the end face so as to cover the entire end face of the reinforcing plate wall;
Reinforcing wall fitting step of fitting the reinforcing wall into the inside of the existing shaft set while contacting the inner peripheral surface of the existing shaft set;
In a state in which the reinforcing wall is fitted inward of the existing shaft set, a plurality of penetrating members penetrate through both the peripheral frame member and the existing shaft set in the circumferential direction of the peripheral frame member. A reinforcing wall fixing step performed over the entire circumference,
The reinforcing plate wall has a plurality of plate materials,
The plurality of plate members are arranged in a direction orthogonal to the longitudinal direction by contacting the plate members adjacent to each other at a small end while aligning the longitudinal direction of the plate member in one of the vertical direction and the horizontal direction. Aligned as the alignment direction,
The small end is provided with a plurality of dowels for restricting the relative movement in the longitudinal direction between the plate members adjacent in the alignment direction,
Each of the dowels is fitted with each dowel hole recessed in the small end of the plate material adjacent in the alignment direction so that no gap is generated,
The length in the longitudinal direction of at least one dowel for each small end is not less than the length in the alignment direction.

The invention shown in claim 3
A method for constructing a reinforcing wall that reinforces an existing shaft assembly having a pair of existing column members and a pair of upper and lower existing horizontal members spanned between the pair of existing column members,
A reinforcing plate wall forming step of forming a reinforcing plate wall forming the main body of the reinforcing wall;
A reinforcing wall forming step of forming the reinforcing wall by fixing a peripheral frame member to the end face so as to cover the entire end face of the reinforcing plate wall;
Reinforcing wall fitting step of fitting the reinforcing wall into the inside of the existing shaft set while contacting the inner peripheral surface of the existing shaft set;
In a state in which the reinforcing wall is fitted inward of the existing shaft set, a plurality of penetrating members penetrate through both the peripheral frame member and the existing shaft set in the circumferential direction of the peripheral frame member. A reinforcing wall fixing step performed over the entire circumference,
The reinforcing plate wall has a plurality of plate materials,
The plurality of plate members are arranged in a direction orthogonal to the longitudinal direction by contacting the plate members adjacent to each other at a small end while aligning the longitudinal direction of the plate member in one of the vertical direction and the horizontal direction. Aligned as the alignment direction,
The small end is provided with a plurality of dowels for restricting the relative movement in the longitudinal direction between the plate members adjacent in the alignment direction,
The length in the longitudinal direction of at least one dowel per each small end is greater than or equal to the length in the alignment direction;
The dowels and the plate material are wood,
The fiber direction of the wood according to the dowel is along the longitudinal direction,
The fiber direction of the wood which concerns on the said board | plate material is along the said longitudinal direction.

The invention shown in claim 4
A reinforcing wall for reinforcing an existing shaft assembly having a pair of existing column members and a pair of upper and lower existing horizontal members spanned between the pair of existing column members,
A reinforcing plate wall forming the main body of the reinforcing wall;
A peripheral frame member fixed to the end surface so as to cover the entire end surface of the reinforcing plate wall;
In a state where the peripheral frame member fixed to the reinforcing plate wall is fitted inward of the existing shaft set while being in contact with the inner peripheral surface of the existing shaft set, the peripheral frame member and the existing shaft set are A plurality of penetrating members penetrating across both,
The plurality of penetrating members are provided over the entire circumference of the peripheral frame member ,
The peripheral frame member is fixed to the end surface via a fitting structure so that relative movement in at least the circumferential direction between the end surface and the peripheral frame member is restricted.
The reinforcing plate wall has a plurality of plate materials,
The plurality of plate members are arranged so that the longitudinal direction of each plate member is aligned,
The existing shaft characterized in that the length in the longitudinal direction of the fitting structure provided on the end surface along the longitudinal direction of the end surfaces is equal to or longer than the length in the direction orthogonal to the longitudinal direction. Reinforcing wall that reinforces the pair.

  The invention shown in claim 5
A reinforcing wall for reinforcing an existing shaft assembly having a pair of existing column members and a pair of upper and lower existing horizontal members spanned between the pair of existing column members,
  A reinforcing plate wall forming the main body of the reinforcing wall;
  A peripheral frame member fixed to the end surface so as to cover the entire end surface of the reinforcing plate wall;
  In a state where the peripheral frame member fixed to the reinforcing plate wall is fitted inward of the existing shaft set while being in contact with the inner peripheral surface of the existing shaft set, the peripheral frame member and the existing shaft set are A plurality of penetrating members penetrating across both,
  The plurality of penetrating members are provided over the entire circumference of the peripheral frame member,
  The reinforcing plate wall has a plurality of plate materials,
  In the plurality of plate members, the plate members adjacent to each other are in contact with each other at a small end while aligning the longitudinal direction of the plate member in one of the vertical direction and the horizontal direction, and a direction orthogonal to the longitudinal direction Are aligned and arranged as an alignment direction,
  The small end is provided with a plurality of dowels for restricting the relative movement in the longitudinal direction between the plate members adjacent in the alignment direction,
  Each of the dowels is fitted with each dowel hole recessed in the small end of the plate material adjacent in the alignment direction so that no gap is generated,
  The length in the longitudinal direction of at least one dowel for each small end is not less than the length in the alignment direction.

  The invention described in claim 6
A reinforcing wall for reinforcing an existing shaft assembly having a pair of existing column members and a pair of upper and lower existing horizontal members spanned between the pair of existing column members,
  A reinforcing plate wall forming the main body of the reinforcing wall;
  A peripheral frame member fixed to the end surface so as to cover the entire end surface of the reinforcing plate wall;
  In a state where the peripheral frame member fixed to the reinforcing plate wall is fitted inward of the existing shaft set while being in contact with the inner peripheral surface of the existing shaft set, the peripheral frame member and the existing shaft set are A plurality of penetrating members penetrating across both,
  The plurality of penetrating members are provided over the entire circumference of the peripheral frame member,
  The reinforcing plate wall has a plurality of plate materials,
  In the plurality of plate members, the plate members adjacent to each other are in contact with each other at a small end while aligning the longitudinal direction of the plate member in one of the vertical direction and the horizontal direction, and a direction orthogonal to the longitudinal direction Are aligned and arranged as an alignment direction,
  The small end is provided with a plurality of dowels for restricting the relative movement in the longitudinal direction between the plate members adjacent in the alignment direction,
  The length in the longitudinal direction of at least one dowel per each small end is greater than or equal to the length in the alignment direction;
The dowels and the plate material are wood,
  The fiber direction of the wood according to the dowel is along the longitudinal direction,
  The fiber direction of the wood which concerns on the said board | plate material is along the said longitudinal direction.

  According to the present invention, when constructing a reinforcing wall inward of an existing shaft, it is possible to construct a reinforcing wall capable of reliably transmitting stress to the existing shaft without disassembling the existing shaft. Become.

FIG. 1A is a front view and a central longitudinal sectional view of an existing shaft set 5 before constructing the reinforcing wall 10 of the first embodiment, and FIG. 1B is a BB sectional view in FIG. 1A. These are CC sectional drawing in FIG. 1A. 2A is a front view and a central longitudinal sectional view of the existing shaft set 5 after the construction of the reinforcing wall 10 of the first embodiment, FIG. 2B is a BB sectional view in FIG. 2A, and FIG. It is CC sectional drawing in FIG. 2A. 3A is a front view and a central longitudinal sectional view of the reinforcing wall 10 of the first embodiment, FIG. 3B is a sectional view taken along the line BB in FIG. 3A, and FIG. 3C is a sectional view taken along the line CC in FIG. It is sectional drawing. It is IV-IV sectional drawing in FIG. 2A. It is a front view of the existing shaft set 5 provided with the reinforcing plate wall 311 of the comparative example. It is a schematic front view of the existing shaft set 5 for demonstrating the problem of the reinforcing plate wall 311 of a comparative example. FIG. 7A is an enlarged front view of the central portion of the reinforcing plate wall 11 of the first embodiment, and FIG. 7B is a cross-sectional view taken along line BB in FIG. 7A. FIG. 8A is a schematic diagram showing the behavior of the vertically long dowel 321 when a horizontal external force acts on the reinforcing plate wall 311, and FIG. 8B shows the horizontally long dowel when the horizontal external force acts on the reinforcing plate wall 11. FIG. 9A and 9B are schematic views of the test pieces 11s1 and 11s2 and the test apparatus used in the experiment. 10A and 10B are graphs of load-displacement of the example and the comparative example, respectively. FIG. 11A is a front view and a central longitudinal sectional view of the existing shaft set 5 after the construction of the reinforcing wall 110 of the second embodiment, and FIG. 11B is a sectional view taken along the line BB in FIG. 11A. 3 is an enlarged front view of a central portion of a reinforcing plate wall 111. FIG. It is a schematic diagram showing the behavior of the fitting convex portion 117 formed integrally with the plate material 115 when a horizontal external force acts on the reinforcing plate wall 111. 14A and 14B are schematic views of the test pieces 111s1, 111s2 and the test apparatus used in the experiment. FIG. 15A and FIG. 15B are load-displacement graphs of the example and the comparative example, respectively. It is a front view of the modification of 1st Embodiment. It is a front view of the modification of 2nd Embodiment. It is a front view of the modification of 2nd Embodiment. 19A and 19B are enlarged front views of the central portion of the reinforcing plate wall 111 according to the modification of the second embodiment.

=== First Embodiment ===
FIGS. 1A to 3C are explanatory views of the reinforcing wall 10 of the first embodiment provided to reinforce the existing shaft assembly 5. 1A to 1C show the existing shaft set 5 before the reinforcing wall 10 is constructed, and FIGS. 2A to 2C show the existing shaft set 5 after the reinforcing wall 10 is built. 3A to 3C show the reinforcing wall 10 before being attached to the existing shaft set 5. FIG. In FIGS. 1A, 2A, and 3A, the left half shows a front view, and the right half shows a central longitudinal sectional view. 1B and 1C are a BB sectional view and a CC sectional view in FIG. 1A, respectively. FIGS. 2B and 2C are a BB sectional view and a C- sectional view in FIG. 2A, respectively. FIG. 3B and FIG. 3C are a BB sectional view and a CC sectional view, respectively, in FIG. 3A.

  In the following, the three directions orthogonal to each other are referred to as a wall height direction, a wall width direction, and a wall thickness direction. Here, the wall height direction is the vertical direction, which is the vertical direction, and the wall width direction and the wall thickness direction are respectively horizontal. The wall width direction is also referred to as the left-right direction, and the wall thickness direction is also referred to as the front-rear direction. Further, in FIGS. 1A to 3C, for the purpose of preventing the complication of the drawings, a cross-sectional portion that should be originally shown by hatching is also shown without hatching.

  The existing building which concerns on 1st Embodiment is a wooden building, As shown to FIG. 1A thru | or FIG. 1C, the existing frame 5 of the wooden is a pair of right and left pillar materials 1, 1 (equivalent to the existing pillar material) And a pair of upper and lower horizontal members 3, 3 (corresponding to existing horizontal members). The cross-sectional shapes of the column members 1 and 1 and the horizontal members 3 and 3 are both substantially rectangular, and both are ridges, but wood other than ridges may be used. Further, the upper horizontal member 3 is, for example, a large beam or a large pull, and the lower horizontal member 3 is a ground cover, a base, or the like. The column member 1 and the horizontal member 3 are connected and fixed so as not to move relative to each other by an appropriate fitting structure such as a mortise and a mortise at the end portions 1e and 3e, and the insertion plug 4. A space SP5 having a rectangular shape in front view is defined inside the existing frame group 5 having a rectangular frame shape. Note that the rectangular shape of the space SP5 in front view is maintained in the same shape over the entire length in the wall thickness direction.

  In this space SP5, a reinforcing wall 10 is additionally provided as shown in FIGS. 2A to 2C for the purpose of reinforcing the existing shaft set 5 of FIG. 1A. As shown in FIGS. 3A to 3C, the reinforcing wall 10 includes a reinforcing plate wall 11 constituting a main body of the reinforcing wall 10 and all four end surfaces 11 a, 11 a, 11 b, and 11 b of the reinforcing plate wall 11. And a peripheral frame member 31 fixed to these end faces 11a, 11a, 11b, and 11b.

  The reinforcing plate wall 11 has a plurality of substantially rectangular plate members 15, 15. Each plate 15 is in contact with the plate 15 adjacent to the upper and lower sides at a small end (kob) 15k, with the longitudinal direction thereof being directed to the left and right horizontal directions and the width direction being directed to the vertical direction. The plate members 15, 15... Are arranged in an aligned manner with the vertical direction, which is a direction perpendicular to the longitudinal direction, as the alignment direction. In addition, dowels 21 are respectively provided on the upper end surface 15u and the lower end surface 15d, which are the small ends 15k of the respective plate members 15, and the plate members 15 and 15 adjacent in the vertical direction are sequentially connected integrally with each other via the dowels 21. Thus, all the plate members 15, 15... Are integrated, thereby functioning as a single rectangular reinforcing plate wall 11 as a whole. In this example, a plate wall made up of a plurality of plate members 15 is illustrated as the reinforcing plate wall 11. However, the present invention is not limited to this. For example, the reinforcing plate wall 11 can be configured by a single large plate. If it exists, the board wall of the said one board may be sufficient. In this example, the plate 15 is a cocoon, but may be wood other than cocoons.

  A plurality of dowel holes 11bh are provided on the upper and lower end surfaces 11b and 11b of the reinforcing plate wall 11 as a fitting structure for fixing corresponding portions 31b (lateral frame portions 31b and 31b described later) of the peripheral frame member 31. , 11bh... Are formed side by side in the width direction of the left and right walls, and the left and right end faces 11a, 11a of the reinforcing plate wall 11 correspond to corresponding portions 31a, 31a (described later) of the peripheral frame member 31. A tenon 11ap is formed for each plate 15 as a fitting structure for fixing the vertical frame portions 31a, 31a). This fitting will be described later.

  As shown in FIG. 2A, the peripheral frame member 31 is disposed between the existing shaft set 5 and the reinforcing plate wall 11 and functions as an attachment member for attaching the reinforcing plate wall 11 to the inside of the existing shaft set 5. To do. Therefore, the surrounding frame member 31 is configured as a rectangular frame corresponding to the rectangular inner peripheral shape of the existing shaft set 5 and the rectangular outer peripheral shape of the reinforcing plate wall 11. Further, the member 31 is divided into four parts so as to facilitate assembly to the reinforcing plate wall 11. That is, as shown in FIG. 3A, the peripheral frame member 31 includes left and right vertical frame portions 31 a and 31 a to be fixed to the left and right end surfaces 11 a and 11 a of the reinforcing plate wall 11, and upper and lower portions of the reinforcing plate wall 11. The upper and lower horizontal frame portions 31b and 31b to be fixed to the respective end surfaces 11b and 11b, and the frame portions 31a, 31a, 31b and 31b are configured to be separable from each other. The vertical frame portion 31a and the horizontal frame portion 31b are connected to each other by a predetermined fitting structure at the end portions 31ae and 31be of the frame portions 31a and 31b, so that these four frame portions 31a, 31a and 31b are connected. , 31b are integrated into the peripheral frame member 31 described above. As the fitting structure, for example, tenon fitting by tenon and tenon hole, dowel fitting by dowel and dowel hole, and the like can be exemplified. In this example, the former tenon fitting is used.

  Each of the left and right vertical frame portions 31a and 31a and the upper and lower horizontal frame portions 31b and 31b has, for example, a square material made of wood having a substantially rectangular cross section as a main body. For any of the frame portions 31a, 31a, 31b, 31b, the dimension in the wall thickness direction is larger than the thickness of the reinforcing plate wall 11, and the reinforcing plate wall in each frame portion 31a, 31a, 31b, 31b. A large insert 31t is formed at a substantially central portion of the surface to which the end surfaces 11a, 11a, 11b, and 11b of the eleven are opposed, and the end surfaces 11a and 11a of the reinforcing plate wall 11 are respectively formed at the bottom of the large insert 31t. , 11b, 11b are provided for fitting. For example, a plurality of mortises 31ah, 31ah,... Are formed intermittently in the wall height direction at the bottom of the large case 31t of each vertical frame portion 31a, 31a, and a reinforcing plate wall is provided in each mortise 31ah. Among the left and right end faces 11a, 11a, the tenons 11ap, 11ap,... Of the corresponding end face 11a are fitted and fixed. On the other hand, a plurality of dowel holes 31bh, 31bh... Are formed side by side in the wall width direction at the bottom of the large case 31t of each horizontal frame portion 31b, 31b, and the upper and lower sides of the reinforcing plate wall 11 are formed in each dowel hole 31bh. The dowels 14 that fit into the dowel holes 11bh of the corresponding end surface 11b among the end surfaces 11b, 11b are fitted and fixed. In addition, as a material of the dowel 14, for example, birch, zelkova, etc. are used. The relative movement between the reinforcing plate wall 11 and the surrounding frame member 31 is restricted in all directions by these fittings, and thereby the stress is transmitted between the reinforcing plate wall 11 and the surrounding frame member 31. Is surely made. However, the fixing structure of the reinforcing plate wall 11 and the peripheral frame member 31 is not limited to fitting, that is, the peripheral frame member 31 is fixed to the end surfaces 11a, 11a, 11b, and 11b of the reinforcing plate wall 11. Another fixing structure may be used as long as it is a fixing structure capable of restricting relative movement in all directions, or at least a fixing structure capable of restricting the circumferential direction (wall width direction and wall height direction) of the peripheral frame member 31.

  The external shape of the reinforcing wall 10 in which the peripheral frame member 31 is fixed to the reinforcing plate wall 11 is maintained substantially the same over the entire length in the wall thickness direction as shown in FIGS. 3A to 3C. In addition, the external dimensions of the reinforcing wall 10 are set to the same or slightly smaller dimensions than the inner method of the existing shaft set 5 in FIG. 1A in the wall height direction and the wall width direction. That is, the outer dimension of the reinforcing wall 10 is the same as or slightly smaller than the outer dimension of the space SP5 having a rectangular shape in front view that the existing shaft set 5 in FIG. 1A partitions inward. Thereby, the outer peripheral surface 10r of the reinforcing wall 10 is made to exist as shown in FIG. 2A by sliding the reinforcing wall 10 of FIG. 3A relative to the existing shaft set 5 of FIG. 1A in the wall thickness direction. The reinforcing wall 10 can be smoothly fitted inside the existing shaft set 5 while being in contact with the inner peripheral surface 5 r of the shaft set 5.

  The fitting is performed, for example, so that the center position in the wall thickness direction of the reinforcing wall 10 matches the center position in the wall thickness direction of the column members 1, 1 or the horizontal members 3, 3 of the existing shaft set 5. (See FIGS. 2B and 2C). Further, in order to fix the reinforcing wall 10 and the existing shaft set 5 to the positional relationship of the fitting, as shown in FIG. 4 (IV-IV sectional view in FIG. 2A), nails 41, 41. The nail 41 is penetrated from both the peripheral frame member 31 and the existing shaft group 5 by driving from the peripheral frame member 31 toward the existing shaft group 5. Then, the nails 41, 41... Are driven over the entire circumference of the peripheral frame member 31, and thereby the relative movement between the peripheral frame member 31 and the existing shaft assembly 5 is ensured in all directions. Be regulated. As a result, the stress transmission between the reinforcing wall 10 and the existing shaft assembly 5 is ensured, and the reinforcing wall 10 functions reliably as the reinforcing wall 10 for reinforcing the existing shaft assembly 5 as described above. It is in a state to get.

  Incidentally, as shown in FIG. 4, in the first embodiment, the nail 41 is driven in two positions as an example of a plurality of positions in the wall thickness direction. Specifically, nails 41 and 41 are driven into positions on the inner peripheral surface 31r of the peripheral frame member 31 at positions where the reinforcing plate wall 11 is sandwiched from both sides in the wall thickness direction. By the way, this driving position is in the unformed portion of the large insertion 31t of the inner peripheral surface 31r of the peripheral frame member 31, that is, the remaining portion of the surface 31r where the large insertion 31t is formed in each vertical frame portion 31a and each horizontal frame portion 31b. Since it is set, the driving operation can be easily performed. Further, the driving direction of the nail 41 is directed in a direction inclined by a predetermined angle with respect to the wall width direction or the wall height direction, and the driving directions of the two pairs of nails 41, 41 are not parallel to each other. The nail 41, 41 is driven in while adjusting. Therefore, the pair of nails 41 and 41 are restrained from each other and reliably prevented from coming off.

The reinforcing wall 10 is constructed inward of the existing frame 5 of the existing building by the following construction procedure.
First, the plate members 15, 15 ... and the dowels 21, 21 ... shown in FIG. 3A are produced at the construction site, factory, etc., and the plate members 15, 15 are sequentially connected by the dowels 21, so that one reinforcing plate wall is formed. 11 (reinforcing plate wall forming step).

  Next, the peripheral frame member 31 is fixed to the end surfaces 11a, 11a, 11b, and 11b so as to cover the entire end surfaces 11a, 11a, 11b, and 11b of the reinforcing plate wall 11. That is, the corresponding vertical frame portions 31a and 31a are attached to the left and right end surfaces 11a and 11a of the reinforcing plate wall 11 by tenon fitting, and correspond to the upper and lower end surfaces 11b and 11b of the reinforcing plate wall 11, respectively. The horizontal frame portions 31b and 31b are attached by dowel fitting to form the reinforcing wall 10 (reinforcing wall forming step).

  If it does so, the reinforcement wall 10 will be carried in to the existing building of a construction site. Then, the reinforcing wall 10 is fitted into the inside of the existing shaft set 5 while the reinforcing wall 10 is brought into contact with the inner peripheral surface 5r of the existing shaft set 5 of the existing building shown in FIG. 1A (reinforcing wall fitting step). ).

  Next, in a state where the reinforcing wall 10 is fitted inward of the existing shaft assembly 5, the nails 41, 41... Are driven and both the nails 41, 41. Thus, the reinforcing wall 10 is fixed to the existing shaft assembly 5 (reinforcing wall fixing step). And the reinforcement wall 10 is constructed | assembled in the existing frame 5 with the above. As is apparent from the above, according to the construction method of the reinforcing wall 10, the reinforcing wall 10 capable of reliably transmitting stress to the existing shaft group 5 is constructed without disassembling the existing shaft group 5. be able to.

  Incidentally, as described above, in the first embodiment, the reinforcing plate wall 11 is firmly fixed to the peripheral frame member 31 by mortise fitting and dowel fitting, and the peripheral frame member 31 is already secured by nail fastening. The shaft assembly 5 is firmly fixed. Therefore, even under the action of the horizontal external force F (FIG. 6), the stress is reliably transmitted between the reinforcing plate wall 11 and the existing shaft assembly 5, thereby causing local breakage of the reinforcing plate wall 11 due to the compression bundle. Effectively prevented. FIG. 5 is a front view of a plate wall 311 of a comparative example for explanation.

  In the case of the comparative example of FIG. 5, that is, only the large insert 1t is formed in a groove shape along the top and bottom in the pair of left and right column members 1, 1, and the left and right of the reinforcing plate wall 311 are formed in the large insert 1t. Both end portions 311a and 311a are inserted and fixed, and only a large case 3t is formed in a groove shape along the left and right sides of the pair of upper and lower horizontal members 3 and 3, and a reinforcing plate wall 311 is formed in the large case 3t. When a horizontal external force F as shown in FIG. 6 is applied when the upper and lower ends 311b and 311b are inserted and fixed, the shaft assembly 5 including the column members 1 and 1 and the horizontal members 3 and 3 is Like the two-dot chain line in FIG. 6, it is easily deformed into a parallelogram. That is, since the entire reinforcing plate wall 311 cannot transmit the shearing force on the four sides in the shaft assembly 5 subjected to the shearing force, the diagonal force is applied to the diagonal of the shaft assembly 5 in the diagonal direction. The compressive force concentrates on the corners at both ends in the direction, and as a result, lateral compression occurs in the fibers of the plate material 315 at the opposite ends in the orthogonal direction, and the diagonal length is shortened. 5 easily deforms into a parallelogram shape. Then, for the inner angles θ1, θ3 of the obtuse angle out of the four inner angles θ1, θ2, θ3, θ4 of the existing shaft set 5 shown in FIG. The stress from the compression bundle acts on a portion in the vicinity of the intersection between the column member 1 and the column material 1, and this portion is easily damaged.

  On the other hand, in the reinforcing plate wall 11 of the first embodiment of FIG. 2A, the reinforcing plate wall is connected to the peripheral frame member 31 nailed to the existing shaft assembly 5 by tenon fitting or dowel fitting. 11 is being fixed, and the relative movement between the existing shaft 5 and the reinforcing plate wall 11 is thereby restricted. Therefore, when the horizontal external force F of FIG. 6 described above is applied, it is possible to transmit stress in the vertical direction to the column members 1 and 1 at the left and right ends 11a and 11a of the reinforcing plate wall 11, and the reinforcing plate wall 11 It is possible to transmit stress in the horizontal direction to the horizontal members 3, 3 at the upper and lower ends 11b, 11b. 1 can be effectively transmitted, and the breakage of the portion in the vicinity of the intersection is suppressed. As a result, the value of the horizontal external force F can be set larger than the frame type of the comparative example of FIG. Further, since the horizontal member 3 and the column member 1 are also elements that resist deformation, parallelogram-shaped deformation is also suppressed, and as a result, the in-plane shear rigidity and proof stress of the reinforcing plate wall 11 are further improved.

<<< About the dowel 21 that connects the plate members 15 and 15 of the reinforcing plate wall 11 >>>
Here, the dowel 21 that connects the plate members 15 and 15 of the reinforcing plate wall 11 of the first embodiment will be described. 7A and 7B are explanatory diagrams of the dowel 21. FIG. 7A shows an enlarged front view of the central portion of the reinforcing plate wall 11, and FIG. 7B shows a cross-sectional view taken along line BB in FIG. 7A.
The dowels 21 that integrally connect the plate members 15 and 15 are embedded in the small end 15k of the plate member 15 as described above. That is, dowel holes 16 and 16 are respectively provided in the small ends 15k and 15k of the plate materials 15 and 15 adjacent to each other in the vertical direction, and the dowel holes 16 and the lower plate plate 15 on the upper plate material 15 facing each other. The dowels 21 are fitted over the dowel holes 16 of the plate member 15 on the side, so that the upper plate member 15 and the lower plate member 15 are connected to the left and right in the horizontal direction as the longitudinal direction thereof. It is integrated in a state where relative movement is restricted. Then, by repeating the integration of the plate members 15 and 15 in the vertical direction, as described above with reference to FIG. 3A, all the plate members 15, 15. No. 11 is provided, and a reinforcing effect such as enhancing the earthquake resistance of existing wooden structures by receiving horizontal external force such as seismic force input from the column member 1 or the horizontal member 3 is achieved.

  The dowel 21 is, for example, a solid cuboid member. Wood is used as the material, and wood harder than the plate material 15 is used. Here, “hard” means that the amount of compressive deformation is small (that is, hard to be crushed) when a compressive load is applied. In this example, since the plate material 15 is a cocoon, white wood is used as a harder wood than this. Or cocoons are used.

  Further, each inner method of the dowel hole 16 is designed to be the same size or slightly smaller than each outer method of the dowel 21, so that when the dowel 21 is fitted in the dowel hole 16, A gap is not formed between the dowel hole 16 and the dowel hole 16. However, when the plate members 15 and 15 are connected to each other via the dowel 21, the depth of the dowel hole 16 is set so that these plate members 15 and 15 come into contact with each other over substantially the entire surface of the small ends 15 k and 15 k. The length D is set to a value approximately half of the outer method L1 in the vertical direction of the dowel 21 and the small end 15k of each plate 15 is formed on a flat surface.

  Here, in the first embodiment, the longitudinal direction of the dowel 21 faces the longitudinal direction of the plate 15. That is, in the state where the dowel 21 is fitted in the dowel hole 16, the length L2 in the direction parallel to the longitudinal direction of the plate 15 (the left-right direction in the example of FIG. 7A) is the alignment direction of the plate 15 (example of FIG. 7A). Is formed in a horizontally long shape longer than the length L1 in the vertical direction). Thereby, the horizontal proof stress of the reinforcing plate wall 11 itself is increased, and the earthquake resistance of the existing building can be improved.

The reason why the horizontal proof stress is improved in this way is presumed as follows.
When the dowel 321 has a vertically long shape as in the comparative example of FIG. 8A, that is, when the longitudinal direction of the dowel 321 faces the vertical direction that is perpendicular to the longitudinal direction of the plate material 315, the left and right direction of the dowel 315. The length of is shortened. Therefore, the area bearing the shearing force in the left-right direction is reduced, and the shear rigidity of the dowel 321 is reduced. As a result, the dowel 321 is subject to large shear deformation, and the dowel 321 is likely to be rotationally deformed. As a result, the horizontal proof stress of the reinforcing plate wall 311 is reduced.

  On the other hand, in the case of the first embodiment in FIG. 8B, the dowels 21 are elongated in the left-right direction, which is the longitudinal direction of the plate material 15. Therefore, since the area which bears the shearing force in the left-right direction is large, the shear rigidity of the dowel 21 is increased. As a result, the dowel 21 is less likely to undergo shear deformation and rotational deformation of the dowel 321 is less likely to occur. Further, since the upper surface 21a and the lower surface 21b of the dowel 21 are widely secured in the left-right direction, the rotational moment acting on the dowel 21 when the vertically adjacent plate members 15, 15 move relative to each other in the horizontal direction is This is effectively received by the upper surface 21a and the lower surface 21b, which can also contribute to suppression of rotational deformation. As a result, it is considered that the rotation of the dowel 21 is reduced as shown by the two-dot chain line in FIG. 8B and the horizontal proof stress of the reinforcing plate wall 11 is improved. In addition, it is a fact also confirmed by the below-mentioned experiment that horizontal proof stress improves as the board wall 11 for reinforcement.

  Regarding the horizontally long shape of the dowel 21, in the example of FIG. 7A, the length L 2 of the dowel in a direction parallel to the longitudinal direction of the plate material 15 (the wall width direction (left-right direction in FIG. 7A)) and the alignment direction of the plate material 15 ( In FIG. 7A, the ratio with the length L1 of the dowel 21 in the wall height direction (vertical direction) is set to 3: 1, but this is not restrictive. That is, basically, the length L2 of the dowel 21 in the direction parallel to the longitudinal direction of the plate material 15 (the wall width direction (left-right direction in FIG. 7A)) is set to the alignment direction of the plate material 15 (the wall height direction (FIG. 7A)). If the length L1 of the dowels 21 in the vertical direction)) is set to be equal to or longer than the length L1, the horizontal proof stress of the reinforcing plate wall 11 can be increased as compared with the comparative example (FIG. 5). However, in practice, the above ratio is preferably set in the range of 2: 1 to 4: 1.

  In the example of FIG. 7A, since the rectangular dowel 21 is used, the left and right fore edges are vertical surfaces perpendicular to the left and right direction, and the left and right sides of the dowel hole 16 facing both fore edges. The end surface is also a vertical surface orthogonal to the left-right direction. Accordingly, the horizontal external force can be substantially uniformly received by the surface contact between the small edge of the dowel 21 and the end face of the dowel hole 16, and the dowel 21 and the dowel hole 16 when the horizontal external force acts on the dowel 21 and the dowel hole 16. The amount of compressive deformation such as crushing or sinking can be reduced, and as a result, the relative movement between the adjacent plate members 15 and 15 is effectively restricted, which also contributes to the improvement of the horizontal strength of the reinforcing plate wall 11.

  Here, the fiber direction of the dowel 21 made of wood is preferably along the left-right direction that is the longitudinal direction of the plate material 15, and more preferably, the fiber direction of the plate material 15 is the left-right direction that is the longitudinal direction of the plate material 15. It is good to be along.

  And if it does in this way, the compressive strength and compression rigidity of the dowel 21 and the board | plate material 15 can be improved regarding the left-right direction which is the longitudinal direction of the board | plate material 15. FIG. As a result, it is possible to reduce the amount of compressive deformation such as the dowel 21 and the dowel hole 16 being crushed or sunk when a horizontal external force is applied to the reinforcing plate wall 11, and as a result, the plate materials 15, 15 adjacent to each other vertically Relative movement can be reliably controlled.

  In the example of FIG. 2A, the dowels 21, 21... Are discretely arranged in a substantially lattice pattern on the wall surface of the reinforcing plate wall 11. That is, the dowels 21, 21... Are arranged at a predetermined pitch in the wall width direction (longitudinal direction (horizontal direction) of the horizontal member 3), and the dowels 21, 21 adjacent in the vertical direction are positioned in the wall width direction. However, this arrangement pattern is not limited to this, and for example, a staggered arrangement may be used.

Since the horizontal strength improvement effect of the reinforcing plate wall 11 by the horizontally long dowels 21 described above has been confirmed by experiments, the results will be described below.
9A and 9B are schematic views of the test pieces 11s1 and 11s2 and the test apparatus used in the experiment. FIG. 9A shows the case of a horizontally long dowel 21 as an example, and FIG. 9B shows the case of a vertically long dowel 321 as a comparative example.

  The test piece 11s1 of the embodiment shown in FIG. 9A substantially corresponds to a portion of the reinforcing plate wall 11 shown in FIG. Moreover, the test piece 11s2 of the comparative example shown in FIG. 9B is also the same size as the above-mentioned example as an external dimension. That is, each of the test pieces 11s1 and 11s2 has three plate members 15, 15, 15 (315, 315, 315) arranged in the alignment direction orthogonal to the longitudinal direction of the plate material 15 (315), and the center in the alignment direction. On both sides of the plate material 15 (315), one plate material 15, 15 (315, 315) is attached via a dowel 21 (321).

  However, in the test piece 11s1 of the embodiment of FIG. 9A, a horizontally long dowel 21 is provided at each of the small ends 15k, 15k of the central plate member 15, whereas in the comparative example of FIG. In this case, two vertically long dowels 321 are provided at each of the small ends 315k and 315k. Further, the size of the dowel 21 of the embodiment is 24 × 180 × 60 mm, whereas the size of the dowel 321 of the comparative example is 24 × 24 × 60 mm. Here, 60 mm is the length L1 of the dowels 21 and 321 in the alignment direction of the plate materials 15 (315). In both the example and the comparative example, the depth D of the dowel holes 16 and 316 is set to 30 mm. Since they are aligned, even in the dowels 21 and 321, the length L1 in the alignment direction is aligned to 60 mm. Moreover, about the length L2 of the dowels 21 and 321 concerning the longitudinal direction of the board | plate material 15 (315), although an Example is 180 mm, a comparative example is 24 mm, Thereby, the dowel 21 of an Example is a comparative example. The dowel 321 is formed in a horizontally long shape. The remaining 24 mm is the length of the dowels 21 and 321 in the wall thickness direction (the direction penetrating the paper surface of FIGS. 9A and 9B) and is the same size as each other.

  On the other hand, the test apparatus has fixed heads 91 and 91 and a movable head 93. The plate members 15 and 15 (315 and 315) on both sides of the test piece 11s1 (11s2) are fixed to the fixed heads 91 and 91, and the central plate member 15 (315) is fixed to the movable head 93. In this state, the movable head 93 is slid along the longitudinal direction of the plate material 15 (315) at a speed of, for example, 2 mm / min, thereby loading the longitudinal load on the central plate material 15 (315), The sliding amount of the movable head 93 is measured while measuring the load value at that time with the load cell. Then, the measured load value and slide amount are plotted on the same graph as the load value and displacement amount of the load-displacement graph, respectively. In addition, the maximum value of the slide amount was 40 mm, that is, after unloading after sliding to 40 mm.

  10A and 10B show the experimental results of the examples and comparative examples, respectively. Here, the above-described experiment was performed three times for the example and twice for the comparative example. Therefore, three graphs are shown in FIG. 10A and two graphs are shown in FIG. 10B. Has been.

  In addition, in the same experiment, in accordance with the contents of the first embodiment described above, the plate material 15 (315) is used with a kite, while the dowel 21 of the example is used with a white kite, and the dowel 321 of the comparative example is used. A cocoon was used. Here, both white birch and cocoons are wood that is sufficiently harder than cocoons. Therefore, when the damage state of the dowel 21 (321) and the dowel hole 16 (316) was observed after the experiment, the dowel hole 16 (316) was largely damaged, such as being recessed or sunk exclusively. That is, the damage on the dowel 21 (321) remained almost as shallow as the surface, and there was no conspicuous trauma such as a large dent.

Hereinafter, experimental results will be described with reference to the graphs of FIGS. 10A and 10B.
First, the proof stress of each test piece 11s1, 11s2 was evaluated by the first load peak value in the graph. 10A, the average value of the peak values of the three graphs is 58.4 kN. In the comparative example of FIG. 10B, the average value of the peak values of the two graphs is 35. 3 kN. From this, it was found that the test piece 11s1 of the example showed higher proof stress than the test piece 11s2 of the comparative example, although the number of dowels was half that of the comparative example.

  Further, when the yield strength per dowel is calculated, in the comparative example, since the number of dowels is 4, the above yield strength 35.3 kN is divided by the dowel number 4 to obtain 8.8 kN, In the example, since the dowel number is 2, the yield strength of 58.4 kN was divided by 2 to obtain 29.2 kN. Therefore, it was found that the horizontally long dowel structure of the example had a yield strength about three times that of the vertically long dowel structure of the comparative example. Moreover, although initial rigidity is also improving, it is guessed that it is related that the transmission of the force of the dowel 21 and the board | plate material 15 is made by compression of fiber directions.

  Furthermore, according to the observation result of the damage state of the test pieces 11s1 and 11s2 after the experiment, the dowel 321 is greatly rotated in the test piece 11s2 of the comparative example, whereas in the test piece 11s1 of the example, It was confirmed that the rotation of the dowel 21 was greatly suppressed. From this, it was found that the rotational behavior of the dowels 21 and 321 is greatly related to the proof stress of the test pieces 11s1 and 11s2 simulating the reinforcing plate walls 11 and 311.

=== Second Embodiment ===
FIGS. 11A and 11B are explanatory views of the reinforcing wall 110 of the second embodiment provided to reinforce the existing shaft set 5. In FIG. 11A, the left half shows a front view, and the right half shows a central longitudinal sectional view. FIG. 11B is a cross-sectional view taken along the line BB in FIG. 11A.

  In the first embodiment described above, the plurality of plate members 15, 15... Constituting the reinforcing plate wall 11 are connected and integrated by the dowels 21. However, in this second embodiment, the plate members 115 and 115 are not used without using the dowels 21. It is mainly different in that they are connected with a fitting (meshing) structure. Therefore, in the following description, only this difference is demonstrated, the same code | symbol is attached | subjected about the structure similar to 1st Embodiment, and the description is abbreviate | omitted. For example, with respect to the reinforcing plate wall 111 of FIG. 11A, the peripheral frame member 31 (that is, the vertical frame portions 31a and 31a and the horizontal frame portions 31b and 31b) covers all four end surfaces 111a, 111a, 111b, and 111b. Is fixed in the same manner as the reinforcing plate wall 11 of the first embodiment, and therefore the peripheral frame member 31 and the like will not be described.

  The reinforcing plate wall 111 according to the second embodiment includes a plurality of substantially rectangular plate materials 115, 115. Each plate member 115 is in contact with the plate member 115 adjacent to the upper and lower sides at the small end 115k with the longitudinal direction thereof being directed to the horizontal direction on the left and right and the width direction being directed to the upper and lower direction, thereby orthogonal to the longitudinal direction. The plate members 115, 115,.

  Further, a fitting convex portion 117 or a fitting concave portion 118 is formed on each of the upper end surface 115 u and the lower end surface 115 d which are the small ends 115 k of each plate member 115. And the fitting recessed part 118 or the fitting convex part 117 is formed in the small end 115k of the board | plate material 115 adjacent to the upper direction and the downward direction corresponding to said fitting convex part 117 or the fitting recessed part 118. As shown in FIG. The plate members 115 adjacent to each other in the vertical direction are connected together in order by fitting the fitting protrusions 117 and the fitting recesses 118 corresponding to each other, thereby integrating all the plate members 115, 115. As a single reinforcing plate wall 111. The details of the fitting convex portion 117 and the fitting concave portion 118 will be described later.

  In the example of FIG. 11A, except for the plate member 115 at the upper end and the plate member 115 at the lower end, the planar shapes of the plate members 115, 115... Located between them are the same every other vertical direction. That is, these plate materials 115, 115... Are roughly classified into two types of outer shape plate materials 15 in consideration of the shapes of the fitting convex portion 117 and the fitting concave portion 118. More specifically, there are two types: a group of plate materials 115 from the second, fourth, sixth, and eighth from the top, and a group of third, fifth, and seventh plate materials 115 from the top. The outline shape is roughly divided. However, it does not have to be roughly divided into two types. That is, the plate members 115, 115... Do not have to have the same shape every other vertical direction. For example, the width of the plate member 115 (the length in the vertical direction (wall height direction in the example of FIG. 11A)) The plate thickness (the length in the front-rear direction (wall thickness direction) in the example of FIG. 11B) may be different for each of the plate materials 115, 115.

FIG. 12 is an explanatory diagram of the fitting convex portion 117 and the fitting concave portion 118, and shows the central portion of the reinforcing plate wall 111 in an enlarged front view.
The fitting protrusions 117 and the fitting recesses 118 that integrally connect the plate members 115 and 115 are formed inseparably as a part of the plate member 115 at the small end 115k of the plate member 115, respectively. That is, the fitting convex portion 117 is protruded from the small end 115k of the plate material 115 by cutting out the surrounding portion, while the fitting concave portion 118 is partly fitted to the fitting convex portion. It is recessed at the small end 115k by being cut out in the shape of 117 or a similar shape. And the dimension of the fitting convex part 117 is formed in the same dimension as the fitting recessed part 118, or slightly larger, and a clearance gap is not formed between each other at the time of a fitting. Therefore, on the basis of the fitting, the upper plate member 115 and the lower plate member 115 are integrated in a state in which the relative movement in the horizontal direction, which is the longitudinal direction, is restricted. Then, the fitting is sequentially repeated for all the plate members 115, 115... Arranged in the vertical direction, and as described above with reference to FIG. 11A, all the plate members 115, 115. A reinforcing plate wall 111 is formed.

  In addition, the shape of the fitting convex part 117 and the fitting recessed part 118 is respectively maintained in the same shape in any cross section over the full thickness of a wall thickness direction (direction which penetrates the paper surface of FIG. 12). Therefore, when making it fit, it can be made to fit easily by sliding in the wall thickness direction in the state where the fitting convex part 117 and the fitting concave part 118 overlap each other in a front view.

By the way, even if the reinforcing plate wall 111 of this second embodiment, that is, the fitting structure composed of the fitting convex portion 117 and the fitting concave portion 118 is used for connecting the plate members 115 and 115 to each other, As in the case of the reinforcing plate wall 11 using the horizontally long dowels 21 of the embodiment, the horizontal proof stress of the reinforcing plate wall 111 can be improved. This will be described in detail below.
As shown in FIG. 13, the fitting convex portion 117 is a part of the plate material 115 that is inseparably integrated with the plate material 115 with respect to one plate material 115 (the lower plate material 115 in FIG. 13). Therefore, by directly engaging the plate members 115, 115, it is possible to secure a large shear load area with respect to the horizontal force, and as a result, the plate members 115, 115 adjacent to each other in the vertical direction even under the action of a large horizontal external force. It becomes difficult to relatively move in the horizontal direction, and the horizontal proof stress as the reinforcing plate wall 111 is improved. In addition, it is confirmed also by the below-mentioned experiment that this horizontal yield strength improves.

  In the example of FIG. 12, one end surface 117e1 in the left-right direction of the fitting convex portion 117 is formed on a vertical plane orthogonal to the left-right direction, and the other end surface 117e2 in the same direction is formed from the tip 117s of the fitting convex portion 117. It forms in the taper surface so that the length of the left-right direction of the fitting convex part 117 may become short as it goes to the base end 117b. And if comprised in this way, the board | plate material 115,115 will be firmly connected by the said taper surface 117e2 in the said alignment direction so that separation is impossible, and this can improve the integrity of the reinforcing board wall 111. it can. On the other hand, one end surface 117e1 of the fitting convex portion 117 is formed on a vertical surface instead of the tapered surface as described above. Therefore, when fitting the fitting convex part 117 and the fitting concave part 118, it becomes easy to make it fit.

  In some cases, the one end surface 117e1 of the fitting convex portion 117 may also be a tapered surface having a reverse slope with respect to the other end surface 117e2, that is, a tapered surface having an inclination opposite to each other is formed on the left and right sides of the fitting convex portion 117. You may form in the both end surfaces 117e1 and 117e2 of a direction. In this case, the workability of the fitting work is inferior to that of the above-described configuration, but the integrity of the reinforcing plate wall 111 can be improved as compared with the above.

Furthermore, in the example of FIG. 12, both the fitting convex portion 117 having the above-described tapered surface 117e2 and the fitting concave portion 118 into which the fitting convex portion 117 can be fitted are formed at each small end 115k. ing. That is, the part which is not the fitting convex part 117 in the small end 115k becomes the fitting concave part 118, and thereby the fitting convex part 117 and the fitting concave part 118 are alternately arranged in the left-right direction (longitudinal direction of the plate member 115). Are formed at a predetermined pitch P.
And according to this structure, since the fitting state which cannot be separated in the said alignment direction is ensured over the full length of the left-right direction, the board | plate materials 115 and 115 can be connected firmly, and the reinforcement board wall 111 is integrated. As a result, the earthquake resistance of the reinforcing plate wall 111 can be further improved.

  Desirably, the fiber direction of the plate material 115 made of wood is aligned with the left-right direction which is the longitudinal direction of the plate material 115. If it does in this way, the compression strength and compression rigidity of fitting convex part 117 and fitting concave part 118 can be raised about the horizontal direction which is the longitudinal direction of board material 115. That is, since the fitting convex part 117 and the fitting concave part 118 are mutually compressed in the fiber direction of the plate member 115, the force is transmitted, so that the initial rigidity is increased. Thereby, it is possible to reduce the amount of compressive deformation such as crushing or squeezing of the fitting convex portion 117 and the fitting concave portion 118 when the horizontal external force acts on the reinforcing plate wall 111, and as a result, the plate members 115 adjacent to each other vertically The relative movement in the left-right direction can be reliably regulated.

Since the effect of improving the horizontal proof stress of the reinforcing plate wall 111 by the fitting convex portion 117 and the fitting concave portion 118 described above has been confirmed by experiments, the results thereof will be described below.
14A and 14B are schematic views of the test pieces 111s1, 111s2 and the test apparatus used in the experiment. FIG. 14A shows a case of the fitting convex portion 117 and the fitting concave portion 118 as an example, and FIG. 14B shows a case of a vertically long dowel 321 as a comparative example.

  The test piece 111s1 of the example shown in FIG. 14A substantially corresponds to a portion of the reinforcing plate wall 111 shown in FIG. Moreover, the test piece 111s2 of the comparative example shown in FIG. 14B is also the same size as the above-mentioned example as an external dimension. That is, each of the test pieces 111s1 and 111s2 includes three plate members 115, 115, and 115 (315, 315, and 315) arranged in the alignment direction orthogonal to the longitudinal direction of the plate member 115 (315). In the embodiment, one plate material 115, 115 is attached to both sides of the central plate material 115 in the alignment direction by the fitting convex portion 117 and the fitting concave portion 118. On the other hand, the test piece 111s2 of the comparative example of FIG. 14B is the same as the test piece 11s2 of the comparative example of FIG. 9B used in the experiment of the first embodiment. Therefore, the description of the test piece 111s2 of the comparative example will be described while omitting appropriately.

  Any of the plate members 115, 115... (315, 315...) Has a uniform thickness of 47 mm over the entire surface. Further, the dimensions of the fitting convex part 117 and the fitting concave part 118 are the same, and the details are as follows. First, the vertical length L1 which is the height of the fitting convex portion 117 is 15 mm, the horizontal length L2b on the proximal end 117b side of the fitting convex portion 117 is 177 mm, and the horizontal length L2b on the distal end 117s side. The length L2e is 180 mm. In this way, by making the length L2e on the distal end 117s side longer than the length L2b on the proximal end 117b side, as shown in FIG. One surface 117e1 is a vertical surface orthogonal to the left-right direction, while the other surface 117e2 is inclined from the vertical surface by a predetermined gradient (length in the left-right direction: length in the up-down direction = 6: 15). It has a tapered surface. Further, in accordance with the contents of the second embodiment described above, a ridge is used for the plate material 115 (315).

  The same test apparatus as in the experiment of the first embodiment is used, and the test method is the same as in the experiment of the first embodiment. That is, the plate members 115, 115 (315, 315) on both sides of the test piece 111s1 (111s2) are fixed to the fixed heads 91, 91 of the test apparatus, and the central plate member 115 (315) is attached to the movable head 93. ) Is fixed, and the movable head 93 is slid along the longitudinal direction of the plate 15 (315) at a speed of 2 mm / min, for example, so that a load in the same direction is applied to the central plate 15 (315). Then, the slide amount of the movable head 93 was measured while measuring the load value at that time with the load cell.

  FIG. 15A and FIG. 15B show the experimental results of the example and the comparative example, respectively. In each figure, the entire graph is shown on the left side, and the initial displacement portion of the graph is enlarged on the right side so that the initial stiffness can be seen. Further, here, the above-described experiment was performed three times for the example and twice for the comparative example, so that FIG. 15A shows three graphs and FIG. 15B shows two graphs. Has been. 15B is the same as the graph of FIG. 9B described above.

Hereinafter, experimental results will be described with reference to the graphs of FIGS. 15A and 15B.
First, the proof stress of each of the test pieces 111s1, 111s2 was evaluated by the first load peak value in the graph. 15A, the average value of the peak values of the three graphs is 107.7 kN. In the comparative example of FIG. 15B, the average value of the peak values of the two graphs is 35.k. 3 kN. From this, it can be seen that the test piece 111s1 of the example shows much higher proof stress than the test piece 111s2 of the comparative example.

  Incidentally, when the graph of the initial stiffness on the right side of FIG. 15A and FIG. 15B is seen, the initial stiffness is much higher in the example than in the comparative example. It is assumed that force is transmitted by compression between each other.

=== Other Embodiments ===
As mentioned above, although embodiment of this invention was described, this invention is not limited to this embodiment, The deformation | transformation as shown below is possible in the range which does not deviate from the summary.

  In the above-described embodiment, the nail 41 is illustrated as an example of the penetrating member for fixing the peripheral frame member 31 to the existing shaft assembly 5. However, as the nail 41, for example, an iron round nail, a Japanese nail, or a shaft portion is used. A screw nail having an uneven portion on the outer peripheral surface can be used. In some cases, a metal nail other than iron may be used, and a screw (for example, Tarkick (trademark)) or staple may be used.

  In the above-described embodiment, the column member 1 and the horizontal member 3 related to the existing frame 5 of the existing building, the peripheral frame member 31, the plate member 15 (115) related to the reinforcing plate wall 11 (111), and the dowels 14 and 21. All were made of wood, but the material is not limited to wood. For example, it may be made of concrete, resin, metal or the like.

  In the above-described embodiment, the definition of the existing shaft group 5 has not been described. However, the existing shaft group 5 refers to a shaft group that has been built in advance before the reinforcement wall 10 is built.

  In the above-described first embodiment, the dowel 21 for connecting the plate members 15 and 15 forming the reinforcing plate wall 11 is illustrated as a rectangular parallelepiped shape, but is not limited thereto. For example, a cylindrical body having a circular or elliptical cross section, a triangular prism having a triangular cross section, or a polygonal cylinder having a pentagon or more in cross section may be used.

  In the first embodiment described above, as shown in FIG. 2A, the longitudinal direction of the plate material 15 of the reinforcing plate wall 11 is aligned in the horizontal direction, but the present invention is not limited to this. For example, as shown in the front view of FIG. 16, the longitudinal direction of the plate material 15 may be aligned in the vertical direction (vertical direction). In this case, since the longitudinal direction of the plate material 15 is directed in the vertical direction, the longitudinal direction of the dowel 21 is also disposed in the vertical direction. That is, when the dowel 21 is fitted in the dowel hole 16, the length in the vertical direction parallel to the longitudinal direction of the plate material 15 is set to be longer than the length in the left-right direction parallel to the alignment direction of the plate material 15. become. Even in such a configuration, the horizontal proof stress of the reinforcing plate wall 11 can be increased by the same reason as described above, and the seismic resistance of the existing building can be improved. That is, when the horizontal external force F0 acts on the reinforcing plate wall 11, the horizontal external force F0 is converted into the vertical shearing force F1 via the internal force of the reinforcing plate wall 11, as shown in FIG. The plate members 15 and 15 are relatively moved in the vertical direction by the shearing force F1, and at this time, since the dowel 21 restricts the relative movement in the vertical direction, the dowel 21 is the same as that in the first embodiment. The same yield strength improvement effect can be produced.

In the first embodiment described above, as shown in FIG. 2A, all the dowels 21, 21... Have the same shape, and the longitudinal directions of all the dowels 21, 21. However, it is not limited to this. For example, if the longitudinal direction of at least one dowel 21 is arranged in a direction parallel to the longitudinal direction of the plate member 15 for each small end 15k, the corresponding strength improvement effect can be obtained. That is, with respect to all the small ends 15k, 15k,... Aligned in the alignment direction, if the longitudinal direction of at least one dowel 21 is arranged in a direction parallel to the longitudinal direction of the plate member 15 for each small end 15k, It belongs to the scope of the present invention.
However, as shown in FIG. 2A, for all the dowels 21, 21..., The length of the dowels 21 in the longitudinal direction of the plate material 15 is not less than the length of the dowels 21 in the alignment direction of the plate materials 15. Needless to say, it is possible to increase the yield strength of the reinforcing plate wall 11 more reliably.

  In the first embodiment described above, as shown in FIG. 3B, the length of the dowel 21 in the thickness direction (wall thickness direction) of the plate material 15 is made smaller than the thickness of the plate material 15. However, it is not limited to this. For example, the length of the dowel 21 in the thickness direction of the plate material 15 may be the same as or greater than the thickness of the plate material 15. However, in that case, a part of the dowel 21 is exposed to the outside from the plate surface of the plate 15.

In the second embodiment described above, as shown in FIG. 11A, the longitudinal direction of the plate member 115 of the reinforcing plate wall 111 is aligned in the horizontal direction, but the present invention is not limited to this. For example, as shown in the front view of FIG. 17, the longitudinal direction of the plate material 115 may be aligned in the vertical direction (vertical direction). Also with this configuration, the horizontal strength of the reinforcing plate wall 111 can be increased with the same reasoning as described above, and the earthquake resistance of the existing building can be improved. That is, when the horizontal external force F0 acts on the reinforcing plate wall 111, as shown in FIG. 17, the horizontal external force F0 is converted into the vertical shearing force F1 via the internal force of the reinforcing plate wall 111. The plate members 115 and 115 are relatively moved in the vertical direction by the shearing force F1. At this time, the relative movement in the vertical direction is restricted by the fitting convex portion 117 being fitted with the fitting concave portion 118. The fitting convex portion 117 can exhibit the same yield strength improvement effect as that of the second embodiment described above.
Incidentally, also in this case, the shape of the fitting projection 117 in front view is parallel to the longitudinal direction of the plate material 115 rather than the length in the direction parallel to the alignment direction of the plate material 115 from the viewpoint of improving the shear load area. It is preferable that the length in the direction is longer. That is, in this case, since the longitudinal direction of the plate material 115 is directed in the vertical direction, the shape of the fitting convex portion 117 is set such that the vertical length is longer than the horizontal length.

  In the second embodiment described above, the other end surface 117e2 in the left-right direction has the tapered surface 117e2 as shown in FIG. 12, but the shape of the fitting convex portion 117 is not limited to this. For example, as shown in the front view of FIG. 18, even if the both end surfaces 117e3 and 117e4 in the left and right direction of the fitting convex portion 117 are rectangular fitting convex portions 117 formed on a vertical plane orthogonal to the left and right direction. Further, it may be a fitting protrusion 117 having a triangular shape when viewed from the front. In these cases as well, it goes without saying that the fitting recess 118 is formed in a concave shape such as the same shape or a similar shape corresponding to the shape of the fitting convex portion 117.

Further, in some cases, as shown in the enlarged front view of the reinforcing plate wall 111 in FIG. 19A, the tapered surface of the other end surface 117e2 of the fitting convex portion 117 is formed into a tapered surface having a reverse gradient to the tapered surface of FIG. You may do it. Specifically, as shown in FIG. 19A, one end surface 117e1 in the left-right direction of the fitting convex portion 117 is formed on a vertical plane orthogonal to the left-right direction, and the other end surface 117e2 in the left-right direction of the fitting convex portion 117 is fitted. You may form in the taper surface 117e2 so that the length of the fitting convex part 117 may become large as it goes to the base end 117b from the front-end | tip 117s of the joint convex part 117. As shown in FIG. By doing so, the fitting projection 117 can be formed in a shape (trapezoidal shape) in which the base end 117b side is widened, and the fitting projection 117 can be effectively prevented from cracking or chipping.
Further, in some cases, in addition to the above-described tapered surface 117e2, as shown in FIG. 19B, the one end surface 117e1 of the fitting convex portion 117 may be a tapered surface having a reverse gradient with respect to the other end surface 117e2. That is, you may form the taper surface of the mutually reverse inclination in the both-ends surface 117e1, 117e2 of the left-right direction of the fitting convex part 117. FIG. In this case, the front-view shape of the fitting convex portion 117 in FIG. 19B is a shape in which the base end 117b side is further expanded (trapezoidal shape), and as a result, the fitting convex portion 117 is more effectively cracked and chipped. Can be suppressed. In both cases of FIGS. 19A and 19B, it goes without saying that the fitting concave portion 118 is formed in a concave shape such as the same shape or a similar shape corresponding to the shape of the fitting convex portion 117. .

In the second embodiment described above, as shown in FIG. 11A, all the fitting convex portions 117, 117... Are aligned in the same shape, but the present invention is not limited to this. The shape of the front view may be different for each part 117.
Further, if the longitudinal direction of at least one fitting convex portion 117 is oriented in a direction parallel to the longitudinal direction of the plate member 115, the area bearing the shearing force in the same direction is correspondingly increased in the fitting convex portion 117. Since the shear rigidity is increased and the rigidity is improved, it is only necessary that the longitudinal direction of at least one fitting convex portion 117 is directed in a direction parallel to the longitudinal direction of the plate member 115.
However, as shown in FIG. 11A, the length L2 of the fitting projection 117 in the longitudinal direction of the plate material 115 (the left-right direction in FIG. 11A) is the alignment direction of the plate material 115 (with respect to all the fitting projections 117, 117. Needless to say, it is preferable that the length L1 of the fitting convex portion 117 in the vertical direction in FIG. 11A is greater than the length L1 of the reinforcing plate wall 111 because the horizontal proof stress can be more reliably increased.

  In the second embodiment described above, the length of the fitting projection 117 in the thickness direction (wall thickness direction) of the plate material 115 is made the same as the thickness of the plate material 115, whereby the fitting projection 117 is the plate of the plate material 115. Although it was exposed from the surface in the front direction, it is not limited to this. For example, the length of the fitting projection 117 in the thickness direction of the plate material 115 may be smaller than the thickness of the plate material 115. In this case, the fitting projection 117 is embedded in the small end 115k of the plate material 115. From the front, the fitting convex portion 117 becomes invisible. Incidentally, in this case, from the viewpoint of workability of the fitting operation between the fitting convex portion 117 and the fitting concave portion 118, it is preferable that both end surfaces in the left-right direction of the fitting convex portion 117 are formed in parallel to each other. That is, the front shape of the fitting convex portion 117 is preferably a rectangular shape or a parallelogram shape.

1 column material (existing column material), 1e end, 3 horizontal member (existing horizontal member), 4 spigot,
5 Existing shaft, 5r inner surface,
10 reinforcing wall, 10r outer peripheral surface,
11 reinforcing plate wall, 11a end face, 11b end face,
11bh dowel hole,
11s1 test piece, 11s2 test piece,
14 Dowels,
15 plate material, 15k small end, 15d lower end surface, 15u upper end surface,
16 Dowel holes,
21 dowels, 21a top surface, 21b bottom surface,
31 peripheral frame member, 31a vertical frame portion, 31ae end, 31ah mortise,
31b horizontal frame part, 31be end, 31bh dowel hole, 31t large insertion,
31r inner peripheral surface,
41 Nail (penetrating member),
91 fixed head, 93 movable head,
110 reinforcing wall, 111 reinforcing plate wall, 111a end face, 111b end face,
111s1 test piece, 111s2 test piece,
115 plate material, 115k small end, 115d lower end surface, 115u upper end surface,
117 fitting convex part,
117b proximal end, 117s distal end,
117e1 end face, 117e2 end face, 117e3 end face, 117e4 end face,
118 fitting recess,
311 Reinforcing plate wall, 311a end, 311b end, 315 plate,
315k small end, 316 dowel hole,
321 Dowels,
SP5 space,

Claims (6)

A method for constructing a reinforcing wall that reinforces an existing shaft assembly having a pair of existing column members and a pair of upper and lower existing horizontal members spanned between the pair of existing column members,
A reinforcing plate wall forming step of forming a reinforcing plate wall forming the main body of the reinforcing wall;
A reinforcing wall forming step of forming the reinforcing wall by fixing a peripheral frame member to the end face so as to cover the entire end face of the reinforcing plate wall;
Reinforcing wall fitting step of fitting the reinforcing wall into the inside of the existing shaft set while contacting the inner peripheral surface of the existing shaft set;
In a state in which the reinforcing wall is fitted inward of the existing shaft set, a plurality of penetrating members penetrate through both the peripheral frame member and the existing shaft set in the circumferential direction of the peripheral frame member. A reinforcing wall fixing step performed over the entire circumference ,
In the reinforcing wall forming step, the peripheral frame member is fixed to the end surface via a fitting structure so that relative movement in the circumferential direction between the end surface and the peripheral frame member is restricted at least.
The reinforcing plate wall has a plurality of plate materials,
The plurality of plate members are arranged so that the longitudinal direction of each plate member is aligned,
The existing shaft characterized in that the length in the longitudinal direction of the fitting structure provided on the end surface along the longitudinal direction of the end surfaces is equal to or longer than the length in the direction orthogonal to the longitudinal direction. A method of building a reinforced wall that reinforces a pair. A method for constructing a reinforcing wall that reinforces an existing shaft assembly having a pair of existing column members and a pair of upper and lower existing horizontal members spanned between the pair of existing column members,
A reinforcing plate wall forming step of forming a reinforcing plate wall forming the main body of the reinforcing wall;
A reinforcing wall forming step of forming the reinforcing wall by fixing a peripheral frame member to the end face so as to cover the entire end face of the reinforcing plate wall;
Reinforcing wall fitting step of fitting the reinforcing wall into the inside of the existing shaft set while contacting the inner peripheral surface of the existing shaft set;
In a state in which the reinforcing wall is fitted inward of the existing shaft set, a plurality of penetrating members penetrate through both the peripheral frame member and the existing shaft set in the circumferential direction of the peripheral frame member. A reinforcing wall fixing step performed over the entire circumference,
The reinforcing plate wall has a plurality of plate materials,
The plurality of plate members are arranged in a direction orthogonal to the longitudinal direction by contacting the plate members adjacent to each other at a small end while aligning the longitudinal direction of the plate member in one of the vertical direction and the horizontal direction. Aligned as the alignment direction,
The small end is provided with a plurality of dowels for restricting the relative movement in the longitudinal direction between the plate members adjacent in the alignment direction,
Each of the dowels is fitted with each dowel hole recessed in the small end of the plate material adjacent in the alignment direction so that no gap is generated,
The method for constructing a reinforcing wall for reinforcing an existing shaft set, wherein the length in the longitudinal direction of at least one dowel for each small end is equal to or longer than the length in the alignment direction. A method for constructing a reinforcing wall that reinforces an existing shaft assembly having a pair of existing column members and a pair of upper and lower existing horizontal members spanned between the pair of existing column members,
A reinforcing plate wall forming step of forming a reinforcing plate wall forming the main body of the reinforcing wall;
A reinforcing wall forming step of forming the reinforcing wall by fixing a peripheral frame member to the end face so as to cover the entire end face of the reinforcing plate wall;
Reinforcing wall fitting step of fitting the reinforcing wall into the inside of the existing shaft set while contacting the inner peripheral surface of the existing shaft set;
In a state in which the reinforcing wall is fitted inward of the existing shaft set, a plurality of penetrating members penetrate through both the peripheral frame member and the existing shaft set in the circumferential direction of the peripheral frame member. A reinforcing wall fixing step performed over the entire circumference,
The reinforcing plate wall has a plurality of plate materials,
The plurality of plate members are arranged in a direction orthogonal to the longitudinal direction by contacting the plate members adjacent to each other at a small end while aligning the longitudinal direction of the plate member in one of the vertical direction and the horizontal direction. Aligned as the alignment direction,
The small end is provided with a plurality of dowels for restricting the relative movement in the longitudinal direction between the plate members adjacent in the alignment direction,
The length in the longitudinal direction of at least one dowel per each small end is greater than or equal to the length in the alignment direction;
The dowels and the plate material are wood,
The fiber direction of the wood according to the dowel is along the longitudinal direction,
The fiber construction direction of the wood which concerns on the said board | plate material is along the said longitudinal direction, The construction method of the reinforcement wall which reinforces the existing shaft assembly characterized by the above-mentioned. A reinforcing wall for reinforcing an existing shaft assembly having a pair of existing column members and a pair of upper and lower existing horizontal members spanned between the pair of existing column members,
A reinforcing plate wall forming the main body of the reinforcing wall;
A peripheral frame member fixed to the end surface so as to cover the entire end surface of the reinforcing plate wall;
In a state where the peripheral frame member fixed to the reinforcing plate wall is fitted inward of the existing shaft set while being in contact with the inner peripheral surface of the existing shaft set, the peripheral frame member and the existing shaft set are A plurality of penetrating members penetrating across both,
The plurality of penetrating members are provided over the entire circumference of the peripheral frame member ,
The peripheral frame member is fixed to the end surface via a fitting structure so that relative movement in at least the circumferential direction between the end surface and the peripheral frame member is restricted.
The reinforcing plate wall has a plurality of plate materials,
The plurality of plate members are arranged so that the longitudinal direction of each plate member is aligned,
The existing shaft characterized in that the length in the longitudinal direction of the fitting structure provided on the end surface along the longitudinal direction of the end surfaces is equal to or longer than the length in the direction orthogonal to the longitudinal direction. Reinforcing wall that reinforces the pair. A reinforcing wall for reinforcing an existing shaft assembly having a pair of existing column members and a pair of upper and lower existing horizontal members spanned between the pair of existing column members,
  A reinforcing plate wall forming the main body of the reinforcing wall;
  A peripheral frame member fixed to the end surface so as to cover the entire end surface of the reinforcing plate wall;
  In a state where the peripheral frame member fixed to the reinforcing plate wall is fitted inward of the existing shaft set while being in contact with the inner peripheral surface of the existing shaft set, the peripheral frame member and the existing shaft set are A plurality of penetrating members penetrating across both,
  The plurality of penetrating members are provided over the entire circumference of the peripheral frame member,
  The reinforcing plate wall has a plurality of plate materials,
  In the plurality of plate members, the plate members adjacent to each other are in contact with each other at a small end while aligning the longitudinal direction of the plate member in one of the vertical direction and the horizontal direction, and a direction orthogonal to the longitudinal direction Are aligned and arranged as an alignment direction,
  The small end is provided with a plurality of dowels for restricting the relative movement in the longitudinal direction between the plate members adjacent in the alignment direction,
  Each of the dowels is fitted with each dowel hole recessed in the small end of the plate material adjacent in the alignment direction so that no gap is generated,
  The reinforcing wall that reinforces an existing shaft set, wherein the length in the longitudinal direction of at least one dowel per each small end is equal to or greater than the length in the alignment direction. A reinforcing wall for reinforcing an existing shaft assembly having a pair of existing column members and a pair of upper and lower existing horizontal members spanned between the pair of existing column members,
  A reinforcing plate wall forming the main body of the reinforcing wall;
  A peripheral frame member fixed to the end surface so as to cover the entire end surface of the reinforcing plate wall;
  In a state where the peripheral frame member fixed to the reinforcing plate wall is fitted inward of the existing shaft set while being in contact with the inner peripheral surface of the existing shaft set, the peripheral frame member and the existing shaft set are A plurality of penetrating members penetrating across both,
  The plurality of penetrating members are provided over the entire circumference of the peripheral frame member,
  The reinforcing plate wall has a plurality of plate materials,
  In the plurality of plate members, the plate members adjacent to each other are in contact with each other at a small end while aligning the longitudinal direction of the plate member in one of the vertical direction and the horizontal direction, and a direction orthogonal to the longitudinal direction Are aligned and arranged as an alignment direction,
  The small end is provided with a plurality of dowels for restricting the relative movement in the longitudinal direction between the plate members adjacent in the alignment direction,
  The length in the longitudinal direction of at least one dowel per each small end is greater than or equal to the length in the alignment direction;
The dowels and the plate material are wood,
  The fiber direction of the wood according to the dowel is along the longitudinal direction,
  A reinforcing wall that reinforces an existing shaft set, wherein a fiber direction of wood related to the plate material is along the longitudinal direction.