Reinforcement structure for existing wooden beam

Abstract

To provide a reinforcement structure for an existing wooden beam arranged on an existing building, allowing reinforcement of the existing wooden beam 3 with simple construction without degrading its appearance as a wooden material as much as possible.SOLUTION: Provided is a reinforcement structure for an existing wooden beam 3 composed of lumber and provided in an existing building 1, wherein each of a pair of wooden reinforcement plates 10, which are made of lumber and have a length extending over substantially the entire length of the existing wooden beam 3 and a vertical width larger than that of the existing wooden beam 3, is arranged along both side surfaces of the existing wooden beam 3, and the pair of wooden reinforcement plates 10 are connected to the existing wooden beam 3 at a plurality of positions distributed along an axis direction X of the existing wooden beam 3.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a reinforcing structure for an existing wooden beam made of wood provided in an existing building.

Background Art

[0002] In the renovation work of existing buildings, for example, when it is necessary to reinforce the existing wooden beams provided in the existing buildings for the purpose of expanding the column span or increasing the load-bearing capacity, etc., there may be a need for reinforcement. As a conventional reinforcing structure for existing wooden beams, there is known a structure in which a long reinforcing member along the axial direction of the existing wooden beam is embedded in groove portions formed on the upper and lower surfaces of the existing wooden beam and fixed with an adhesive, mortar, or the like (see, for example, Patent Document 1). Further, since the reinforcing member used in the reinforcing structure of the existing wooden beam described in Patent Document 1 is embedded in the upper and lower surfaces of the existing wooden beam and improves the strength against tensile or compressive forces generated on the upper and lower surfaces thereof, it is necessary to use a steel plate or the like having higher rigidity than wood.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the reinforcing structure of the existing wooden beam described in Patent Document 1, a relatively complicated operation is required to form grooves for embedding the reinforcing members on the upper and lower surfaces of the existing wooden beam, which causes an increase in cost and a lengthening of the construction period. Further, since the reinforcing member adopted in this reinforcing structure is a steel plate or the like different from wood, the outer surface of the reinforcing member different from wood appears on the upper and lower surfaces of the existing wooden beam, and there is a problem that the appearance as wood of the existing wooden beam is impaired. In view of this situation, the main problem of the present invention is to provide a technique capable of reinforcing an existing wooden beam provided in an existing building with a simple construction without damaging the appearance as wood as much as possible in the reinforcing structure of the existing wooden beam.

Means for Solving the Problems

[0005] The first characteristic configuration of the present invention is a reinforcing structure for an existing wooden beam made of wood provided in an existing building, each of a pair of wooden reinforcing plates made of wood having a length extending over substantially the entire length of the existing wooden beam and having a greater vertical width than the existing wooden beam is disposed along both side surfaces of the existing wooden beam, and the pair of wooden reinforcing plates are joined to the existing wooden beam at a plurality of locations dispersed along the axial direction of the existing wooden beam.

[0006] According to this configuration, since the wooden reinforcing plates have a greater vertical width than the existing wooden beam, the bending strength against vertical loads is relatively large. And each of the pair of wooden reinforcing plates is joined and integrated with the existing wooden beam at a plurality of locations dispersed along the axial direction of the existing wooden beam in a state of being disposed along both side surfaces of the existing wooden beam. By this, the existing wooden beam can be reinforced in a form in which a part of the vertical load received by the existing wooden beam is borne by the pair of wooden reinforcing plates integrated along both side surfaces thereof. Furthermore, since the pair of wooden reinforcing plates disposed along both side surfaces of the existing wooden beam are made of wood, it is possible to suppress damage to the appearance of the existing wooden beam as wood. Therefore, according to the present invention, it is possible to provide a technique capable of reinforcing an existing wooden beam provided in an existing building with a simple construction without damaging the appearance as wood as much as possible in the reinforcing structure of the existing wooden beam.

[0007] The second characteristic configuration of the present invention is that the pair of wooden reinforcing plates are disposed in a state where the upper end is positioned below the upper end of the existing wooden beam and has a downward protruding portion protruding downward from the lower end of the existing wooden beam, A wooden spacing maintaining member made of wood is provided, which is joined to both lower protruding portions of the pair of wooden reinforcing plates to prevent a change in the spacing width between the both lower protruding portions. In that the wooden spacing maintaining member includes a wooden splicing member formed to have the same width as the existing wooden beam and interposed between both lower protruding portions of the pair of wooden reinforcing plates and joined to the both lower protruding portions.

[0008] According to this configuration, the upper ends of the pair of wooden reinforcing plates arranged along both side surfaces of the existing wooden beam are each positioned below the upper end of the existing wooden beam and do not protrude above the upper end of the existing wooden beam. Therefore, even when there is a separate member close to the upper side as in the case where the existing wooden beam is a ridge beam or a main roof supporting the roof, interference between the pair of wooden reinforcing plates and the separate member on the upper side can be avoided. And since the pair of wooden reinforcing plates have lower protruding portions protruding downward from the lower end of the existing wooden beam, the flexural strength of the pair of wooden reinforcing plates against vertical loads can be made relatively large. Furthermore, since the change in the spacing width between the both lower protruding portions of the pair of wooden reinforcing plates is prevented by the wooden spacing maintaining member joined to the both lower protruding portions of the pair of wooden reinforcing plates, the posture of the pair of wooden reinforcing plates can always be kept in a posture following the vertical plane, and a decrease in the flexural strength of the wooden reinforcing plates against the vertical load due to the change in the spacing width between the both lower protruding portions can be prevented. Also, since the wooden spacing maintaining member located below the existing wooden beam is made of wood, it is possible to suppress impairing the appearance as wood when viewed from the lower side of the existing wooden beam.

[0009] Furthermore, by providing a wooden splicing member formed to have the same width as the existing wooden beam, interposing this wooden splicing member between both lower protruding portions of the pair of wooden reinforcing plates, and joining and integrating it to the both lower protruding portions, the wooden splicing member can be made to function as the above-described wooden spacing maintaining member, and a decrease in the flexural strength of the wooden reinforcing plates against the vertical load due to the change in the spacing width between the both lower protruding portions of the pair of wooden reinforcing plates can be prevented.

[0010] The third characteristic configuration of the present invention lies in that, between the lower protrusions on both sides of the pair of wooden reinforcement plates, a plurality of the wooden joining members are dispersedly arranged at intervals along the axial direction of the existing wooden beam.

[0011] According to this configuration, while using wooden joining members that are significantly shorter than the substantially entire length of the wooden reinforcement plates, by simply adopting a configuration in which a plurality of the wooden joining members are dispersedly arranged at intervals along the axial direction of the existing wooden beam, it is possible to prevent a change in the interval width between the lower protrusions on both sides at substantially the entire length of the pair of wooden reinforcement plates.

[0012] The fourth characteristic configuration of the present invention is that the pair of wooden reinforcement plates are arranged in a state where the upper ends are positioned below the upper end of the existing wooden beam and have lower protrusion portions that protrude downward from the lower end of the existing wooden beam. A wooden interval width maintaining member made of wood that is joined to the lower protrusion portions on both sides of the pair of wooden reinforcement plates to prevent a change in the interval width between the lower protrusion portions on both sides is provided. As the wooden interval width maintaining member, a pair of groove portions are formed on the upper surface of a wooden beam-shaped member that is formed in a beam shape having a length extending over substantially the entire length of the pair of wooden reinforcement plates, and the lower ends of the lower protrusion portions on both sides of the pair of wooden reinforcement plates are inserted and fixed thereto. The point is that reinforcing bars along the axial direction of the existing wooden beam are embedded in the wooden beam-shaped member.

[0013] According to this configuration, the upper ends of the pair of wooden reinforcement plates arranged along the both side surfaces of the existing wooden beam are positioned below the upper end of the existing wooden beam and do not protrude above the upper end of the existing wooden beam. Therefore, even when there is a separate member close to the upper side as in the case where the existing wooden beam is a ridge beam or a main house supporting the roof, interference between the pair of wooden reinforcement plates and the separate member on the upper side can be avoided. And since the pair of wooden reinforcement plates have lower protrusion portions that protrude downward from the lower end of the existing wooden beam, the bending resistance of the pair of wooden reinforcement plates against the vertical load can be made relatively large. Furthermore, a wooden spacing width maintaining member joined to the lower protruding portions on both sides of the pair of wooden reinforcing plates prevents a change in the spacing width between the lower protruding portions on both sides of the pair of wooden reinforcing plates. Therefore, the postures of the pair of wooden reinforcing plates can always be kept in a posture following the vertical plane, and a decrease in the flexural strength of the wooden reinforcing plates against the vertical load due to a change in the spacing width between the lower protruding portions can be prevented. In addition, since the wooden spacing width maintaining member located below the existing wooden beam is made of wood, it is possible to suppress the impairment of the appearance as wood when viewed from the lower side of the existing wooden beam.

[0014] Furthermore, a wooden beam-shaped member formed in a beam shape having a length extending over substantially the entire length of the wooden reinforcing plate is provided as the wooden spacing width maintaining member. After arranging this wooden beam-shaped member below the existing wooden beam, the lower ends of the lower protruding portions on both sides of the pair of wooden reinforcing plates are inserted into and fixed to a pair of groove portions formed on the upper surface thereof, so that the wooden beam-shaped member functions as the above-described wooden spacing maintaining member, and a decrease in the flexural strength of the wooden reinforcing plates against the vertical load due to a change in the spacing width between the lower protruding portions on both sides of the pair of wooden reinforcing plates can be prevented. In addition, since the fixing of the wooden beam-shaped member to the wooden reinforcing plate is performed on the upper surface side of the wooden beam-shaped member, it is possible to avoid impairment of the appearance when viewed from the lower side. Furthermore, since the wooden beam-shaped member is fixed to the lower ends of the lower protruding portions on both sides of the pair of wooden reinforcing plates over substantially the entire length of the wooden reinforcing plate, it can contribute to an increase in the second moment of area against the vertical load. In addition, since reinforcing bars are embedded along the axial direction of the existing wooden beam, the flexural strength against the vertical load can be further improved.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Mode for Carrying Out the Invention

[0016] Each embodiment of the reinforcement structure for an existing wooden beam according to the present invention will be described with reference to the drawings. In the following description, the reinforcement structure for an existing wooden beam according to each embodiment (hereinafter referred to as "this reinforcement structure") targets an existing wooden beam 3 made of wood provided in a state of being installed between a pair of columns 2 in an existing building 1, and is particularly a structure for effectively reinforcing an existing wooden beam 3 with another member such as a roof finishing material in the upper side being close, like a ridge beam or a main building supporting a roof. And the reinforcement structure of this embodiment is configured to be able to reinforce the existing wooden beam 3 with simple construction so as not to damage the appearance of the existing wooden beam 3 as wood, especially the appearance as wood seen from the lower side as much as possible.

[0017] 〔First Embodiment〕 Details of this reinforcement structure according to the first embodiment will be described with reference to FIGS. 1 and 2. In this reinforcement structure, a pair of wooden reinforcement plates 10 are provided for the existing wooden beam 3. Such wooden reinforcement plates 10 have a length that extends over substantially the entire length in the axial direction X (the left - right direction in FIG. 1) of the existing wooden beam 3, and are made of wood that is wider in the vertical direction Z (the up - down direction in FIGS. 1 and 2) than the existing wooden beam 3. And each of the pair of wooden reinforcement plates 10 is arranged along both side surfaces of the existing wooden beam 3, and the pair of wooden reinforcement plates 10 thus arranged are joined to the existing wooden beam 3 at a plurality of locations dispersed along the axial direction X of the existing wooden beam 3 by a plurality of through - bolts 11 dispersed along the axial direction X of the existing wooden beam 3. Incidentally, instead of the through - bolts 11, joining pins such as drift pins may be used to join the pair of wooden reinforcement plates 10 to the existing wooden beam 3. Also, in this embodiment, in the axial direction X, the length of the wooden reinforcement plate 10 is made equal to the length between the columns 2 of the existing wooden beam 3 (the entire length in the axial direction X of the existing wooden beam 3), and both ends of each of the wooden reinforcement plates 10 are configured to be close to the side surfaces of both columns 2. However, the length of the wooden reinforcement plate 10 may be set to be slightly shorter than the entire length in the axial direction X of the existing wooden beam 3 so that an appropriate gap is provided between both ends of each of the wooden reinforcement plates 10 and the side surfaces of both columns 22.

[0018] In this reinforcement structure, the pair of wooden reinforcement plates 10 that are fastened and integrated with the existing wooden beam 3 by a plurality of through - bolts 11 in a state of being arranged along both side surfaces of the existing wooden beam 3 have a greater width in the vertical direction Z than the existing wooden beam 3, so that the flexural strength against vertical loads is relatively large. Therefore, the existing wooden beam 3 is reinforced in a form in which a part of the vertical load received by the existing wooden beam 3 is borne by the pair of wooden reinforcement plates 10 integrated along both of its side surfaces. Furthermore, since the wooden reinforcement plates 10 along both side surfaces of the existing wooden beam 3 are made of wood, it is suppressed that the appearance of the existing wooden beam 3 as wood is impaired.

[0019] For each of the pair of wooden reinforcing plates 10 arranged along both side surfaces of the existing wooden beam 3, the upper end 10a thereof is located below the upper end 3a of the existing wooden beam 3, and the lower end 10b thereof is located below the lower end 3b of the existing wooden beam 3. And the lower part of each of the pair of wooden reinforcing plates 10 is a downward protruding part 10A protruding downward from the lower end 3b of the existing wooden beam 3. In this way, since the upper end 10a of each of the pair of wooden reinforcing plates 10 does not protrude above the upper end 3a of the existing wooden beam 3, even in the case of a column or a main roof where another member such as a roof finishing material is close to the upper side of the existing wooden beam 3, interference of the wooden reinforcing plate 10 with the other member on the upper side is avoided. Further, since each of the pair of wooden reinforcing plates 10 has a downward protruding part 10A protruding downward from the lower end 3b of the existing wooden beam 3, in order to make the bending resistance of the pair of wooden reinforcing plates 10 against the vertical load sufficiently large, the width in the vertical direction Z of the pair of wooden reinforcing plates 10 can be ensured.

[0020] In this reinforcement structure, between the two downward protruding parts 10A of the pair of wooden reinforcing plates 10, for example, a rectangular wooden splicing member 20 formed to have the same width as the existing wooden beam 3 is interposed. And this wooden splicing member 20 is joined to the two downward protruding parts 10A by through bolts 21 in a state of being interposed between the two downward protruding parts 10A of the pair of wooden reinforcing plates 10. And this wooden splicing member 20 functions as a wooden interval width maintaining member A made of wood that is joined to the two downward protruding parts 10A of the pair of wooden reinforcing plates 10 to prevent a change in the interval width in the depth direction Y (the left - right direction in FIG. 2) of the two downward protruding parts 10A. Incidentally, instead of the through bolts 21, a joining pin such as a drift pin may be used to join the wooden splicing member 20 to the two downward protruding parts 10A.

[0021] The wooden joining member 20 functions as a wooden spacing maintaining member A, preventing the change in the spacing between the downward protruding portions 10A on both sides of the pair of wooden reinforcing plates 10. As a result, the postures of the pair of wooden reinforcing plates 10 are always maintained in a posture following the vertical plane, and the decrease in the bending resistance of the wooden reinforcing plates 10 against the vertical load due to the change in the spacing between the downward protruding portions 10A is prevented. Further, since the wooden joining member 20 functioning as the wooden spacing maintaining member A located below the existing wooden beam 3 is made of wood, the appearance as wood seen from the lower side of the existing wooden beam 3 is suppressed from being impaired.

[0022] In this reinforcement structure, as shown in FIG. 1, between the downward protruding portions 10A on both sides of the pair of wooden reinforcing plates 10, a plurality of wooden joining members 20 are dispersedly arranged at intervals along the axial direction X of the existing wooden beam 3. That is, the wooden joining members 20, which are significantly shorter than the substantially entire length of the pair of wooden reinforcing plates 10, are used, and these wooden joining members 20 are dispersedly arranged at intervals along the axial direction X of the existing wooden beam 3. And by adopting such a simple configuration, the change in the spacing between the downward protruding portions 10A is preferably prevented over substantially the entire length of the pair of wooden reinforcing plates 10. In addition, in this embodiment, a plurality of relatively short wooden joining members 20 are dispersedly arranged in the axial direction X, but the length, number, arrangement interval, etc. of the wooden joining members 20 can be appropriately changed. Also, in the axial direction X, one wooden joining member having a length extending over substantially the entire length of the existing wooden beam 3 may be provided.

[0023] 〔Second Embodiment〕 Details of this reinforcement structure according to the second embodiment will be described based on FIGS. 3 and 4. In addition, for the same configurations as those in the above-described first embodiment, the same reference numerals are used, and the description may be omitted. In this reinforcement structure, below a pair of wooden reinforcement plates 10, a wooden beam-shaped member 30 formed in a beam shape having a length extending over substantially the entire length of the wooden reinforcement plates 10 is provided in a posture substantially parallel to the existing wooden beam 3 with a slight gap therebetween. Further, in the depth direction Y (the left-right direction in FIG. 4), the width of the wooden beam-shaped member 30 is made larger than the width of the existing wooden beam 3 and further than the width between both outer surfaces of the pair of wooden reinforcement plates 10. And, on the upper surface of the wooden beam-shaped member 30, a pair of groove portions 30a are formed into which lower ends 10b of respective lower protruding portions 10A of the pair of wooden reinforcement plates 10 are fitted and fixed by a predetermined fixing portion 40.

[0024] The wooden beam-shaped member 30 functions as a wooden interval width maintaining member A made of wood that is joined to both lower protruding portions 10A of the pair of wooden reinforcement plates 10 and prevents a change in the interval width in the depth direction Y of the both lower protruding portions 10A. And, since the wooden beam-shaped member 30 functions as the wooden interval width maintaining member A and a change in the interval width of both lower protruding portions 10A of the pair of wooden reinforcement plates 10 is prevented, the postures of the pair of wooden reinforcement plates 10 are always maintained in a posture following the vertical plane, and a decrease in the bending resistance of the wooden reinforcement plates 10 against the vertical load due to a change in the interval width of the both lower protruding portions 10A is prevented. Further, since the wooden beam-shaped member 30 functioning as the wooden interval width maintaining member A located below the existing wooden beam 3 is made of wood, it is suppressed that the appearance as wood seen from the lower side of the existing wooden beam 3 is impaired. Furthermore, as shown in FIG. 4, in the wooden beam-shaped member 30, reinforcing bars 35 are embedded along the axial direction X of the existing wooden beam 3 in order to further improve the bending resistance against the vertical load.

[0025] In this embodiment, as the fixing portion 40, an adhesion portion 41 that adheres the inner surface of the groove portion 30a and the outer surface of the lower end 10b of the wooden reinforcement plate 10 fitted therein with an adhesive is adopted. And, since the adhesion portion 41 (fixing portion 40) for fixing the wooden beam-shaped member 30 to the wooden reinforcement plate 10 is located on the upper surface side of the wooden beam-shaped member 30 and cannot be visually recognized from below, it is avoided that the appearance seen from the lower side is impaired. In the present embodiment, as the fixing portion 40 for fixing both lower protruding portions 10A of the pair of wooden reinforcing plates 10 to the wooden needle-shaped member 30, in addition to the bonding portion 41 using the groove portion 30a, an L-shaped bracket 42 (see FIGS. 5 and 6) used in the third embodiment described later can also be adopted. In this case, the fixing by the bonding portion 41 may be simplified or omitted.

[0026] 〔Third Embodiment〕 Details of the present reinforcing structure according to the third embodiment will be described with reference to FIGS. 5 and 6. In addition, for the same configurations as those in the above-described first and second embodiments, the same reference numerals are used, and the description may be omitted. In the present reinforcing structure, a wooden beam-shaped member 31 having a smaller thickness (in the vertical direction Z) than the wooden beam-shaped member 30 (see FIG. 4) described in the second embodiment is provided on the lower side of the pair of wooden reinforcing plates 10, and the lower ends 10b of both lower protruding portions 10A of the pair of wooden reinforcing plates 10 are in contact with the upper surface thereof. And in the present embodiment, as the fixing portion 40, an L-shaped bracket 42 having a shape conforming to the outer surface of both lower protruding portions 10A of the wooden reinforcing plate 10 and the upper surface of the wooden beam-shaped member 31 is adopted. That is, a plurality of pairs of brackets 42 arranged on both surfaces of both lower protruding portions 10A of the wooden reinforcing plate 10 are dispersedly arranged in the axial direction X, and they are fixed to the wooden reinforcing plate 10 and the wooden beam-shaped member 31 respectively with nails or screws 43 or the like, so that the wooden beam-shaped member 31 is fixed to the wooden reinforcing plate 10.

[0027] Similar to the wooden beam-shaped member 30 (see FIG. 4) described in the second embodiment, the wooden beam-shaped member 31 functions as a wooden interval width maintaining member A made of wood that is joined to both lower protruding portions 10A of the pair of wooden reinforcing plates 10 to prevent a change in the interval width in the depth direction Y of the both lower protruding portions 10A. In addition, since the bracket 42 (fixing portion 40) for fixing the wooden beam-shaped member 31 to the wooden reinforcing plate 10 is located on the upper surface side of the wooden beam-shaped member 31, although it can be visually recognized from the side, it cannot be visually recognized from below, so that the appearance seen from the lower side is prevented from being impaired.

[0028] 〔Alternative Embodiment〕 Another embodiment of the present invention will be described. Note that the configurations of each of the embodiments described below are not limited to being applied alone, and can also be applied in combination with the configurations of other embodiments.

[0029] (1) In the above embodiment, the object to be reinforced by this reinforcement structure is the existing wooden beam 3 where another member such as a roof finishing material is close to the upper side, particularly a ridge beam or a main frame that supports the roof. However, existing wooden beams other than the ridge beam or the main frame, or existing wooden beams where no other member is close to the upper side, may also be used as the object to be reinforced.

[0030] (2) In the above embodiment, the wooden stitching member 20 (first embodiment) or the wooden beam-like members 30, 31 (second and third embodiments) are provided as the wooden interval width maintaining member A. However, the form of this wooden interval width maintaining member A can be appropriately changed, and the wooden interval width maintaining member A can also be omitted within a range where a decrease in the bending resistance of the wooden reinforcement plate 10 against the vertical load due to a change in the interval width between the both lower protruding portions 10A does not pose a problem.

Explanation of Reference Numerals

[0031] 1 Existing building 3 Existing wooden beam 3a Upper end 3b Lower end 10 Wooden reinforcement plate 10A Lower protruding portion 10a Upper end 10b Lower end 11 Through bolt 20 Wooden stitching member 21 Through bolt 30 Wooden beam-like member 30a Groove portion 35 Reinforcing bar 40 Fixing portion A Wooden interval width maintaining member X Axis core direction Y Depth direction Z Vertical direction

Claims

1. A reinforcing structure for an existing wooden beam made of wood provided in an existing building, wherein each of a pair of wooden reinforcing plates made of wood having a length extending over substantially the entire length of the existing wooden beam and having a greater vertical width than the existing wooden beam is disposed along both side surfaces of the existing wooden beam, and the pair of wooden reinforcing plates are joined to the existing wooden beam at a plurality of locations dispersed along the axial direction of the existing wooden beam. A reinforcing structure for an existing wooden beam.

2. the pair of wooden reinforcing plates are disposed in a state where the upper end is positioned below the upper end of the existing wooden beam and has a downward protruding portion protruding downward from the lower end of the existing wooden beam, and a wooden spacing maintaining member made of wood joined to both of the downward protruding portions of the pair of wooden reinforcing plates to prevent a change in the spacing width between the both downward protruding portions is provided, The reinforcing structure for an existing wooden beam according to claim 1, further comprising a wooden splicing member formed to have the same width as the existing wooden beam and joined to both of the downward protruding portions of the pair of wooden reinforcing plates while being interposed between the both downward protruding portions of the pair of wooden reinforcing plates as the wooden spacing maintaining member.

3. The reinforcing structure for an existing wooden beam according to claim 2, wherein a plurality of the wooden splicing members are dispersedly arranged at intervals along the axial direction of the existing wooden beam between both of the downward protruding portions of the pair of wooden reinforcing plates.

4. the pair of wooden reinforcing plates are disposed in a state where the upper end is positioned below the upper end of the existing wooden beam and has a downward protruding portion protruding downward from the lower end of the existing wooden beam, and a wooden spacing maintaining member made of wood joined to both of the downward protruding portions of the pair of wooden reinforcing plates to prevent a change in the spacing width between the both downward protruding portions is provided, The reinforcing structure for an existing wooden beam according to claim 1, further comprising a wooden beam-shaped member formed in a beam shape having a length extending over substantially the entire length of the pair of wooden reinforcing plates and having a pair of groove portions formed on the upper surface into which the lower ends of both of the downward protruding portions of the pair of wooden reinforcing plates are inserted and fixed as the wooden spacing maintaining member. The reinforcing structure for an existing wooden beam according to claim 1, wherein reinforcing bars are embedded in the wooden beam-shaped member along the axial direction of the existing wooden beam.

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