Method for reinforcing joints of wooden members by metal jointing

Abstract

To provide a method for reinforcing joints of wooden members by metal jointing, which delays cracking of the wooden members against shear force and lateral tensile stress applied to the joint, and prevents a sudden decrease in strength even if cracking occurs.SOLUTION: There is provided a method for reinforcing joints by metal joints between columns or walls made of wooden members and RC foundations or RC structures, between columns and beams made of wooden members, and between columns or beams made of wooden members. A high-tensile fiber sheet 25 is wrapped or attached (arrow D) in one or more layers on the outer peripheral surface of a column 21, into which a metal jointing 24 is inserted, in a direction perpendicular to the direction in which cracks 26 of the wooden member progress (arrow B), and the high-tensile fiber sheet is impregnated with resin and then hardened.SELECTED DRAWING: Figure 2-1a

Description

[Technical field]

[0001] The present invention relates to a method for reinforcing joints between beams or columns of wooden members using metal joints. [Background technology]

[0002] Conventionally, joints between beams or between columns in mid- to high-rise wooden buildings have been made using the following joining methods (a) to (d). (a) A steel plate insertion joining method 5 in which a slit 2 is made in a wooden piece 1, a steel plate 3 is inserted into the slit, and the steel plate is fixed with a drift pin 4 (see Fig. 1-2a, Fig. 1-2b, Fig. 1-2c). (b) A hole 7 for receiving a washer is drilled in the wood 1, and the wood is pulled in the axial direction by a tension bolt 8 (see Fig. 1-3a and Fig. 1-3b). (c) Wood 1 is sewn together with a lag screw bolt (LSB) 10, LSB joining method 11 (see Figures 1-1a and 1-1b); (d) An adhesive unbonded anchor joint method or adhesive bonded anchor joint method, in which holes are drilled on the joining surfaces of wood pieces, a steel rod is inserted into the hole, and the rod is bound with adhesive (see Patent Document 1, which the applicant calls GIUA (glue in unbonded anchor) or GIR (glue in Rod)); The joining methods are as follows: each joint is joined using a metal joint using a steel plate 3, a tension bolt 8, a lag screw bolt 10, or metal fittings such as a steel rod. In each figure, reference numeral 12 denotes a steel connector. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2021-188326 A (see paragraph 0028) Summary of the Invention [Problem to be solved by the invention]

[0004] These conventional joining methods have the following problems: When a large stress is applied to a joint due to an earthquake or wind, in addition to bending stress, shear force and lateral tensile stress are also applied, causing cracks 13 to form in the wood 1 near the metal fittings of the joint (see Figures 1-1a, 1-1b, 1-2a, 1-2b, 1-3a, and 1-3b). In each figure, arrow A indicates the direction of the applied force, arrow B indicates the direction in which the wood cracks, and arrow C indicates the direction in which the wood tries to open. A transverse tensile force is applied in a direction (arrow A) perpendicular to the direction in which the wood crack advances (arrow B).

[0005] Once a crack 13 occurs in the joint, it spreads rapidly, causing drift pins and screws to deform or become loose, or causing the adhesion to the wood to break, resulting in a rapid decrease in strength. Preventing this sudden drop in strength due to shear and lateral tensile deformation is essential for high-strength, high-rigidity, and tough joints, but there is little knowledge about the lateral tensile strength of wooden members from material experiments, and there are no design standard strengths for tensile strength perpendicular to the grain. Furthermore, design standard strengths only apply to bending, shear, compression, and tensile strength in the grain direction.

[0006] The present invention has been proposed to solve the above-mentioned problems, and its purpose is to delay the splitting of wooden components due to the shear force and lateral tensile stress applied to the joint, and to prevent a sudden decrease in strength even if splitting does occur. [Means for solving the problem]

[0007] The gist of the present invention, which aims to solve the problems of the conventional examples, is a method for reinforcing joints using metal joints between columns or walls made of wooden members and RC foundations or RC structures, between columns and beams made of wooden members, and between columns or beams made of wooden members, by wrapping or attaching a high-tensile fiber sheet in one or more layers around the outer surface of the wooden member into which the metal joint is inserted or will be inserted, in a direction perpendicular to the direction in which the cracking of the wooden member progresses, and impregnating the high-tensile fiber sheet with resin and then curing it.

[0008] The direction in which the crack of the wooden member progresses is the longitudinal direction of the column or beam in the case of the column or beam, and is the vertical direction of the wall in the case of the wall; The high tensile fiber sheet is a carbon fiber sheet, an aramid fiber sheet, or a glass fiber sheet; It includes. Effect of the Invention

[0009] According to the method for reinforcing joints of wooden members by metal joints of the present invention, a high-tensile fiber sheet is wrapped or attached in one or more layers around the outer periphery of the wooden members into which the metal joints are inserted in a direction perpendicular to the direction in which the cracking of the wooden members progresses, and the high-tensile fiber sheet is impregnated with resin and then cured, thereby firmly binding the joints and maintaining the bound state. Therefore, not only can the cracking of the wooden members against shear forces and lateral tensile stresses at the joints be delayed, but a sudden decrease in strength can be prevented even if cracking occurs. In other words, the excellent effect of being able to configure a method for reinforcing joints of wooden members with high strength, high rigidity, and toughness is achieved.

[0010] Since the high-tensile fiber sheet is a carbon fiber sheet, an aramid fiber sheet, or a glass fiber sheet, it can firmly restrain the metal joints of the wooden components, thereby providing the excellent effect of forming joints of the wooden components with high strength, rigidity, and toughness. [Brief description of the drawings]

[0011] [Figure 1-1a] FIG. 2 is a front view of a wooden member illustrating the LSB joining method. [Figure 1-1b] FIG. 2 is a perspective view of a wooden member illustrating the LSB joining method. [Figure 1-2a] FIG. 1 is a front view of a wooden member illustrating a steel plate insertion joining method. [Figure 1-2b] FIG. 2 is a perspective view of a wooden member illustrating a steel plate insertion joining method. [Figure 1-2c]FIG. 2 is a perspective view of a steel plate used in the steel plate insertion joining method. [Figure 1-3a] FIG. 1 is a front view of a wooden member illustrating a tension bolt fastening method. [Figure 1-3b] FIG. 1 is a perspective view of a wooden member illustrating a tension bolt fastening method. [Figure 2-1a] This is a front view showing a metal joint between a wooden column and an RC foundation. [Figure 2-1b] FIG. 2-1b is a cross-sectional view showing a schematic cross section of the pillar of FIG. 2-1a. [Figure 2-1c] This is a front view showing a metal joint between a wooden wall and an RC foundation. [Figure 2-1d] FIG. 2-1c is a cross-sectional view showing a schematic cross section of the wall of FIG. 2-1c. [Figure 2-1e] This is a front view showing a metal joint between a wooden pillar (or wall) and an RC foundation. [Figure 2-2a] FIG. 2 is a front view showing a metal joint between a column and a beam of wooden components. [Figure 2-2b] FIG. 2 is a front view showing a metal joint between a column and a beam of wooden components. [Figure 2-2c] FIG. 2 is a front view showing a metal joint between a column and a beam of wooden components. [Figure 2-2d] FIG. 2 is a front view showing a metal joint between a column and a beam of wooden components. [Figure 2-2e] FIG. 2 is a front view showing a metal joint between a column and a beam of wooden components. [Figure 2-3a] 1 is a front view showing a metal joint between columns or beams of wooden components. FIG. [Figure 2-3b] 1 is a front view showing a metal joint between columns or beams of wooden components. FIG. [Figure 3-1] FIG. 2 is a cross-sectional view of a wooden member showing how a high tensile fiber sheet is attached. [Figure 3-2] FIG. 2 is a cross-sectional view of a wooden member showing how a high tensile fiber sheet is attached. [Figure 3-3]FIG. 2 is a cross-sectional view of a wooden member showing how a high tensile fiber sheet is attached. [Diagram 3-4] FIG. 2 is a cross-sectional view of a wooden member showing how a high tensile fiber sheet is attached. [Figure 4-1] FIG. 11 is a cross-sectional view showing a method of attaching a high tensile fiber sheet in a direction perpendicular to the direction in which the cracks progress. [Figure 4-2] FIG. 11 is a cross-sectional view showing a method of attaching a high tensile fiber sheet in a direction perpendicular to the direction in which the cracks progress. [Figure 4-3] FIG. 11 is a cross-sectional view showing a method of attaching a high tensile fiber sheet in a direction perpendicular to the direction in which the cracks progress. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] The method of reinforcing joints of wooden members by metal joints according to the present invention involves wrapping or attaching a high-tensile fiber sheet in a single or multiple layers around the outer periphery of the wooden members into which the metal joints are inserted in a direction perpendicular to the direction in which cracking of the wooden members progresses, and impregnating the high-tensile fiber sheet with resin and then curing it, thereby delaying cracking of the wooden members against shear force and lateral tensile stress at the joint. Furthermore, even if cracking does occur, a sudden decrease in strength can be prevented. In other words, the objective of achieving a method of reinforcing joints of wooden members with high strength, high rigidity, and toughness has been achieved. In each figure, arrow B indicates the direction in which the cracking of the wood progresses, arrow D indicates the direction in which the high tensile fiber sheet is wrapped or attached, and the area indicated in light ink indicates the high tensile fiber sheet 25. The reference numeral 26 in the figure indicates a split caused by shear or transverse tensile stress. In the following figures, the same reference numerals are used for the same parts.

[0013] In addition, the methods of reinforcing joints of wooden components using metal joints include joints between columns or walls of wooden components and RC foundations or RC structures, joints between columns and beams of wooden components using metal joints, and joints between columns or beams of wooden components using metal joints, and in some cases steel connectors 12 are interposed at the joints.

[0014] The metal fittings in metal fitting joints include not only the steel plate 3, tension bolt 8, lag screw bolt 10, or steel rod described in the conventional example, but also metal members used for joining. Specifically, the direction in which cracks in a wooden member progress is the longitudinal direction of the column or beam in the case of a pillar or beam, and the perpendicular direction of the wall in the case of a wall. The high tensile fiber sheet may be a carbon fiber sheet, an aramid fiber sheet, a glass fiber sheet, or the like, and can firmly bind the metal joints of the wooden members. For convenience, in each of the following figures, a steel rod 24 used in an adhesive unbonded anchor joining method (such as the GIUA joining method) is shown. Specifically, the resin to be impregnated into the high tensile fiber sheet is preferably an epoxy resin, but is not necessarily limited to this and may be a wide variety of resins including adhesives. The method of impregnating a high tensile fiber sheet with resin is carried out at the work site by applying the resin evenly with a brush or roller, but this is not necessarily limited to this method and widely includes various impregnation methods for adhering resin. In practice, the epoxy resin is impregnated into the high tensile fiber sheet and then cured by evenly applying the epoxy resin to the area of ​​the wooden member to be reinforced with a brush or roller, wrapping the high tensile fiber sheet in a single layer, and applying the epoxy resin evenly from the top of the high tensile fiber sheet with a brush or roller, and leaving it to cure for a specified time. When wrapping it twice, the epoxy resin is applied after the first layer has cured, and then the second high tensile fiber sheet is wrapped around it and epoxy resin is applied, and again left to cure for a specified time. In winter, the room temperature may be raised to promote curing. EXAMPLES

[0015] Next, a method of reinforcing joints between wooden columns or walls and RC foundations or RC structures using metal joints will be described. FIG. 2-1a shows a joint 23 made by metal joints between a pillar 21 made of a wooden member and an RC foundation 22, and FIG. 2-1b is a cross-sectional view that shows a schematic cross section of the pillar 21. A column 21 is joined to the top of the RC foundation 22, and a steel rod 24 is inserted into the joint 23 of the column 21. On the outer circumferential surface of the column 21 at this insertion portion, a high tensile fiber sheet 25 is wrapped or attached in one or more layers in a direction (see arrow D: i.e. the wrapping or attaching direction of the high tensile fiber sheet 25) perpendicular to the direction in which the cracking of the wood material progresses (see arrow B: i.e. the longitudinal direction for columns or beams, and the vertical direction for walls). The high tensile fiber sheet 25 is then impregnated with resin and allowed to harden.

[0016] FIG. 2-1c shows a joint 23 formed by metal joints between a wall 27 made of wooden members and an RC foundation 22, and FIG. 2-1d is a cross-sectional view that shows a schematic cross section of the wall 27. A wall 27 is joined to the top of the RC foundation 22, and a steel rod 24 is inserted into the joint 23 of the wall 27. On the outer periphery of the wall 27 at this insertion portion, a high tensile fiber sheet 25 is wrapped or attached in one or more layers in a direction (see arrow D: i.e. the wrapping or attaching direction of the high tensile fiber sheet 25) perpendicular to the direction in which the cracking of the wood material progresses (see arrow B: i.e. the longitudinal direction for columns or beams, and the vertical direction for walls). The high tensile fiber sheet 25 is then impregnated with resin and then hardened.

[0017] FIG. 2-1e shows a joint 23 formed by metal joints when a steel connector 12 is interposed between a wooden column 21 (or a wall 27) and an RC foundation 22. A pillar 21 (or wall 27) is joined to the top of the RC foundation 22 via a connector 12, and a steel rod 24 is inserted into the joint 23 of the pillar 21 (or wall 27). At this insertion site, on the outer periphery of the pillar 21 (or wall 27), a high tensile fiber sheet 25 is wrapped or attached in a single or multiple layers in a direction (see arrow D: i.e., the wrapping or attachment direction of the high tensile fiber sheet 25) perpendicular to the direction in which the cracking of the wood material progresses (see arrow B: i.e., the longitudinal direction for a pillar or beam, and the vertical direction for a wall). The high tensile fiber sheet 25 is then impregnated with resin and then hardened. EXAMPLES

[0018] Next, a method of reinforcing joints between columns and beams of wooden components using metal joints will be described. FIG. 2-2a shows joints 29a, 29b between a pillar 21 and a beam 28 of wooden members, which are jointed by metal fittings. The separate vertical columns 21 and the separate horizontal beams 28 are joined via steel connectors 12, and a steel rod 24 is inserted into the joint 29a of the column 21 and the joint 29b of the beam 28. On the outer peripheral surface of the column 21 and the outer peripheral surface of the beam 28 at the insertion site, a high tensile fiber sheet 25 is wrapped or attached in a single or multiple layers in a direction perpendicular to the direction in which the cracking of the wood member progresses (see arrow B: the longitudinal direction in the case of a column or beam, and the vertical direction in the case of a wall) (see arrow D: the wrapping or attachment direction of the high tensile fiber sheet 25). The high tensile fiber sheet 25 is then impregnated with resin and then cured.

[0019] FIG. 2-2b shows joints 29a, 29b between a pillar 21 and a beam 28 of wooden members, which are jointed by metal fittings. The vertical columns 21 and the separate beams 28 on the left and right in the horizontal direction are joined via steel connectors 12, and steel rods 24 are inserted into joints 29a of the columns 21 and joints 29b of the beams 28. On the outer peripheral surfaces of the columns 21 and beams 28 at the insertion sites, high tensile fiber sheets 25 are wrapped or attached in a single or multiple layers in a direction perpendicular to the direction in which the cracking of the wood members progresses (see arrow B: the longitudinal direction in the case of columns or beams, and the vertical direction in the case of walls) (see arrow D: the wrapping or attachment direction of the high tensile fiber sheet 25). The high tensile fiber sheet 25 is then impregnated with resin and then cured.

[0020] FIG. 2-2c shows joints 29a, 29b between a pillar 21 and a beam 28 of wooden members, which are jointed by metal fittings. The vertical columns 21 and the horizontal beams 28 are joined via a number of steel connectors 12, and a steel rod 24 is inserted into the joint 29a of the column 21 and the joint 29b of the beam 28. On the outer peripheral surface of the column 21 and the outer peripheral surface of the beam 28 at the insertion site, a high tensile fiber sheet 25 is wrapped or attached in a single or multiple layers in a direction perpendicular to the direction in which the cracking of the wood member progresses (see arrow B: the longitudinal direction in the case of a column or beam, and the vertical direction in the case of a wall) (see arrow D: the wrapping or attachment direction of the high tensile fiber sheet 25). The high tensile fiber sheet 25 is then impregnated with resin and then cured.

[0021] FIG. 2-2d shows joints 29a, 29b between a pillar 21 and a beam 28 of wooden members, which are jointed by metal fittings. A vertical pillar 21 is joined to two separate beams 28 on the left and right in the horizontal direction, and a steel rod 24 is inserted into joint 29a of pillar 21 and joint 29b of beam 28, penetrating joint 29a. On the outer peripheral surface of pillar 21 and the outer peripheral surface of beam 28 at the insertion site, a high tensile fiber sheet 25 is wrapped or attached in a single or multiple layers in a direction perpendicular to the direction in which the cracking of the wood member progresses (see arrow B: the longitudinal direction in the case of a pillar or beam, and the vertical direction in the case of a wall) (see arrow D: the wrapping or attachment direction of high tensile fiber sheet 25). Then, high tensile fiber sheet 25 is impregnated with resin and then hardened.

[0022] FIG. 2-2e shows joints 29a, 29b between a pillar 21 and a beam 28 of wooden members, which are jointed by metal fittings. Vertical columns 21 are joined to upper and lower beams 28 in the horizontal direction, and steel rods 24 are inserted into joints 29a of the columns 21 and joints 29b of the beams 28, penetrating the joints 29b. On the outer peripheral surfaces of the columns 21 and beams 28 at the insertion sites, high tensile fiber sheets 25 are wrapped or attached in a single or multiple layers in a direction perpendicular to the direction in which the cracking of the wood members progresses (see arrow B: the longitudinal direction in the case of columns or beams, and the vertical direction in the case of walls) (see arrow D: the wrapping or attachment direction of the high tensile fiber sheet 25). The high tensile fiber sheet 25 is then impregnated with resin and then cured. EXAMPLES

[0023] Next, a method of reinforcing joints between columns or beams of wooden components using metal joints will be described. FIG. 2-3a shows a joint 29 between columns 21 or between beams 28 of wooden members, which is made by metal joints. Separate columns 21 or separate beams 28 are joined together, and a steel rod 24 is inserted into the joint 29 between the columns 21 or into the joint 29 between the beams 28. On the outer peripheral surface of the column 21 and the outer peripheral surface of the beam 28 at the insertion site, a high tensile fiber sheet 25 is wrapped or attached in a single or multiple layers in a direction (see arrow D: i.e., the wrapping or attaching direction of the high tensile fiber sheet 25) perpendicular to the direction in which the cracking of the wood member progresses (see arrow B: i.e., the longitudinal direction in the case of a column or beam, and the vertical direction in the case of a wall). The high tensile fiber sheet 25 is then impregnated with resin and then cured.

[0024] FIG. 2-3b shows a joint 29 between columns 21 or between beams 28 of wooden members, which is made by metal joints. Separate columns 21 or separate beams 28 are joined together via a plurality of steel connectors 12, and a steel rod 24 is inserted into each joint 29 of the columns 21 or the beams 28. On the outer peripheral surface of the columns 21 and the outer peripheral surface of the beams 28 at the insertion sites, a high tensile fiber sheet 25 is wrapped or attached in a single or multiple layers in a direction perpendicular to the direction in which the cracking of the wood members progresses (see arrow B: the longitudinal direction in the case of columns or beams, and the vertical direction in the case of walls). The high tensile fiber sheet 25 is then impregnated with resin and then cured. EXAMPLES

[0025] Figures 3-1, 3-2, 3-3, and 3-4 are cross-sectional views of wooden components showing how to apply a high-tensile fiber sheet. The high-tensile fiber sheet is wrapped or attached in one or more layers around the outer surface of the wooden component in a direction perpendicular to the direction in which the cracking progresses, and the high-tensile fiber sheet is impregnated with resin and then hardened. In each figure, the direction in which the cracking of the wooden member progresses is from the front to the back of the figure (arrow B is omitted).

[0026] 3-1 shows a cross-section of a laminated timber, FIG. 3-2 shows a cross-section of LVL, FIG. 3-3 shows a cross-section of a laminated timber or LVL, and FIG.

[0027] Figures 4-1, 4-2, and 4-3 show a method of attaching a high-tensile fiber sheet in a direction perpendicular to the direction in which the cracks develop. The direction and position of the crack may change depending on the area used, the cross-sectional shape of the wooden component, and the type of metal used in the metal joint, so it is possible to effectively attach the high-tensile fiber sheet to match the direction of the crack's progression and the locations where the crack is likely to occur. 4-1 and 4-2 show cross sections of a beam 28 and a column 21, and FIG. 4-3 shows a cross section of a wall 27.

[0028] The method of reinforcing the joints of wooden members using metal joints constructed as described above involves wrapping or attaching a high-tensile fiber sheet 25 in one or more layers around the outer surface of the wooden member into which the metal joint fittings are inserted, in a direction perpendicular to the direction in which the crack 26 of the wooden member progresses, and impregnating the high-tensile fiber sheet 25 with resin and then curing it, thereby firmly restraining the joints and maintaining the restrained state. Therefore, not only can it be delayed to split the wooden members against shear force and lateral tensile stress at the joint, but it can also prevent a sudden drop in strength even if a split 26 occurs. In other words, it is possible to configure a method for joining wooden members with high strength, high rigidity and toughness. [Explanation of symbols]

[0029] 1 wood 2 Slit 3 steel plate 4 Drift Pin 4a Drift pin hole 5. Steel plate insertion joining method 7 holes 8 Volts 9. Tensile bolt connection method 10 Lag Screw Bolt (LSB) 11 LSB joining method 12 Steel Connector 13 Warisaki 21 Pillars 22 RC foundation 23 Joint 24 steel rod 25 High tensile fiber sheet 26 Warisaki 27 Wall 28 Beam 29, 29a, 29b joint 30 Log 31 Beds

Claims

1. A method for reinforcing joints by metal joints between columns or walls made of wooden members and RC foundations or RC structures, between columns and beams made of wooden members, and between columns or beams made of wooden members, comprising: A high-tensile fiber sheet is wound or attached in a single or multiple layers on the outer peripheral surface of the wooden member in which the metal fitting of the metal fitting is inserted or will be inserted in a direction perpendicular to the direction in which the crack of the wooden member progresses, The high tensile fiber sheet is impregnated with a resin and then cured. A method for reinforcing joints of wooden components using metal joints, characterized by the above.

2. The direction in which the crack of the wooden member progresses is the longitudinal direction of the column or beam in the case of the column or beam, and is the vertical direction of the wall in the case of the wall.

2. A method for reinforcing a joint of wooden members by metal jointing according to claim 1.

3. The high tensile fiber sheet is a carbon fiber sheet, an aramid fiber sheet, or a glass fiber sheet.

2. A method for reinforcing a joint of wooden members by metal jointing according to claim 1.

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