Timber structural reinforcement

Abstract

To provide a wood structural material reinforcing structure capable of preventing a reinforcing member from protruding from a surface on which an opening of a wood structural material is formed and reinforcing the outside of the opening of the wood structural material without causing a cross-sectional defect due to a bolt hole.SOLUTION: This wood structural material reinforcing structure is a wood structural material reinforcing structure for reinforcing the periphery of an opening 1a of a wooden beam 1 as a wood structural material in which the opening 1a is horizontally formed and is provided with a reinforcing member 2 on a surface on which the opening 1a is formed. The reinforcing member 2 is formed in a band shape, has a circular ring shape surrounding the opening 1a, and is inserted in the width direction of the band shape to a surface where the opening 1a is formed across a crack assumed area C assumed to be generated in the long side direction of the wood beam 1.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] This invention relates to a reinforcing structure for a wooden structural material that reinforces the periphery of an opening formed in the wooden structural material.

Background Art

[0002] As shown in FIG. 8, when a vertical load is applied to a wooden beam 100, there is a risk of splitting 102 in the longitudinal direction of the beam on both sides of an opening 101 that penetrates horizontally through the wooden beam 100. Therefore, the periphery of the opening 101 is reinforced.

[0003] In Patent Document 1, for the purpose of preventing a decrease in the mechanical strength of an opening in a beam member made of large-sized laminated wood, a steel pipe is inserted into and adhered to an opening that penetrates horizontally through the laminated wood structural material. At the same time, a plurality of bolt holes that penetrate vertically are drilled around the opening, and the laminated wood structural material is tightened vertically by bolts inserted through the bolt holes. A reinforcing structure is disclosed.

[0004] Further, Patent Document 2 discloses a method of arranging and reinforcing a reinforcing plate on the side surface of a beam around an opening formed in a wooden beam.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, in the reinforcing structure of Patent Document 1 above, since bolt holes that penetrate vertically are drilled around the opening, cross-sectional loss due to the bolt holes occurs in the beam member, and there is a risk that the periphery of the opening cannot be sufficiently reinforced.

[0007] Furthermore, the reinforcing structure described in Patent Document 2 has drawbacks, such as the fact that the reinforcing plate protrudes from the side of the beam, making it difficult to use as a beam on the exterior of a building.

[0008] In view of the above circumstances, this invention aims to provide a wood structural member reinforcing structure that can reinforce the outside of the opening in the wood structural member without causing a reinforcing member to protrude from the surface in which the opening is formed, and without causing a loss of cross-sectional area due to bolt holes. [Means for solving the problem]

[0009] The wood structural reinforcement structure of this invention is a wood structural reinforcement structure that reinforces the area around an opening formed in the horizontal direction of a wood structural material, and is characterized by having a strip shape, and having a reinforcing member inserted in the width direction of the strip shape to the surface on which the opening is formed, crossing the area where splitting is expected to occur in the long side direction of the wood structural material.

[0010] With the above configuration, the reinforcing member can resist the spread of cracks that occur in the assumed cracking area. In other words, even if a crack occurs on the inside of the wood structural material, its spread on the side where the opening is formed is prevented by the reinforcing member inserted into that surface, thus preventing crack failure. Furthermore, since the reinforcing member is inserted into the reinforcing member from the surface where the opening is formed, it is possible to avoid the reinforcing member protruding from that surface, and since no processing is required on the side of the wood structural material where the opening is not formed, no cross-sectional loss due to bending occurs in this wood structural material.

[0011] The reinforcing member may have a ring shape that surrounds the opening. If the reinforcing member has a non-ring shape with an open cross-section rather than a closed cross-section, the open end may widen as the crack spreads, potentially reducing the resistance to crack widening. On the other hand, if the reinforcing member has a ring shape with a closed cross-section, the open end will not widen in response to the crack, thus improving the resistance to crack widening while keeping the thickness of the reinforcing member thin.

[0012] A groove narrower than the thickness of the reinforcing member is formed outside the opening of the above-mentioned wooden structural material, and the reinforcing member may be driven into this groove. This reduces the resistance to driving in the reinforcing member compared to the case where there is no groove, and makes it easier to manufacture the reinforced structure for the wooden structural material. Furthermore, since the width of the groove is narrower than the thickness of the reinforcing member, and the reinforcing member is pressed into the wooden structural material, a higher inhibitory effect against the spread of cracks can be obtained compared to the case where the reinforcing member is loosely fitted into the wooden structural material.

[0013] A groove wider than the thickness of the reinforcing member may be formed outside the opening of the above-mentioned wooden structural material, and the reinforcing member and adhesive may be placed in the groove to bond and fix the reinforcing member to the wooden structural material. This eliminates the need to drive the reinforcing member into the wood, thereby simplifying the fabrication of the wooden structural material reinforcement structure. Furthermore, since the reinforcing member is bonded and fixed to the wooden structural material, a higher inhibitory effect against the spread of cracking can be obtained compared to when the reinforcing member is loosely fitted into the wooden structural material.

[0014] The reinforcing member described above has a pointed end on one side in the width direction of the strip shape, which is thinner towards the tip, and may be driven into the surface where the opening is formed from the side of the pointed end. This eliminates the processing effort of forming a groove outside the opening of the wooden structural material. Furthermore, since groove processing is not required, it becomes easier to provide a reinforcing structure to the wooden structural material of existing buildings.

[0015] The above-mentioned sharp part may have convex blade parts repeatedly formed in the extending direction of the strip shape. According to this, the driving of the above-mentioned reinforcing member can be performed with a smaller force.

Effect of the Invention

[0016] According to the present invention, it is possible to reinforce the periphery of the opening of the wooden structural material without causing a cross-sectional defect with respect to bending in the wooden structural material.

Brief Description of the Drawings

[0017] [Figure 1] It is an explanatory drawing showing a wooden structural material reinforcing structure according to an embodiment. [Figure 2] FIG. (A) of this figure is a front view of the wooden structural material reinforcing structure of FIG. 1, and FIG. (B) of this figure is a schematic longitudinal sectional view taken along the arrow A-A. [Figure 3] It is an explanatory drawing showing a splitting assumed area etc. of the wooden structural material reinforcing structure of FIG. 1. [Figure 4] FIG. (A) of this figure is a front view of the state where the reinforcing member is not attached in the wooden structural material reinforcing structure of FIG. 1, and FIG. (B) of this figure is a schematic longitudinal sectional view taken along the arrow B-B. [Figure 5] FIG. (A) of this figure is a partially enlarged view of a reinforcing member according to another embodiment, and FIG. (B) of this figure is an overall perspective view of the reinforcing member. [Figure 6] It is an explanatory drawing for manufacturing a wooden structural material reinforcing structure using the reinforcing member shown in FIG. 5. [Figure 7] It is an explanatory drawing showing a shape example and an arrangement example etc. of a reinforcing member of a wooden structural material reinforcing structure according to another embodiment. [Figure 8] It is an explanatory drawing showing that splitting occurs in an opening formed in a wooden beam due to a vertical load.

Modes for Carrying Out the Invention

[0018] (Embodiment 1) Hereinafter, embodiments of this invention will be described based on the accompanying drawings. As shown in FIGS. 1, 2(A) and 2(B), in the wood structural member reinforcement structure of this embodiment, a circular opening 1a penetrating horizontally is formed in the wood beam 1 which is a wood structural member, and the periphery of the opening 1a is reinforced. The height (beam depth) H of the wood beam 1 is, for example, 180 mm or more, and the diameter R of the opening 1a is, for example, about 1 / 3H to 1 / 2H. Of course, it is not limited to such dimensions. Also, the wood beam 1 may be a glued laminated timber or a solid wood.

[0019] And in this wood structural member reinforcement structure, for example, a metal reinforcement member 2 is used. This reinforcement member 2 has a strip shape and is inserted in the width direction of the strip with respect to the surface where the opening 1a is formed across the assumed splitting area C that is assumed to occur in the long side direction of the wood beam 1.

[0020] As shown in FIG. 3, the assumed splitting area C is assumed to occur in the long side direction of the wood beam 1 starting from the end of the position where the diameter line of the opening 1a in the short side direction (height direction) of the wood beam 1 rotates, for example, within a range of 45 degrees ± 5 degrees. In this embodiment, it is assumed to occur in the long side direction of the wood beam 1 starting from the end of the diameter line at the position rotated 45 degrees. In this case, the assumed splitting area C is set at a position of (2 - √2)R / 4 from the upper end or the lower end of the opening 1a. In FIG. 3, the assumed splitting area C is shown on the upper right side and the lower left side of the opening 1a, but it can also be assumed on the lower right side and the upper left side of the opening 1a.

[0021] And in this embodiment, the reinforcement member 2 has a circular ring shape surrounding the opening 1a. The outer diameter of this circular reinforcement member 2 is about 10 to 50 mm larger than the diameter R of the opening 1a. Also, the thickness of the reinforcement member 2 is about 0.5 to 2 mm, and the width is about 5 to 50 mm. This ring-shaped reinforcement member 2 crosses all of the above four assumed splitting areas C.

[0022] As shown in Figures 4(A) and 4(B), a circular groove 1b, narrower than the thickness of the reinforcing member 2, is formed on the outside of the opening 1a of the wooden beam 1, and the reinforcing member 2 is driven into this circular groove 1b. The groove 1b may be formed before or after the opening 1a is formed. If the groove 1b is formed before the opening 1a is formed, the circular groove 1b can be easily formed by using a jig that moves a trimmer in a circular motion around a hole drilled in the planned center of the opening 1a.

[0023] With the above configuration, the reinforcing member 2 crosses the expected splitting area C, so it can resist the spread of splitting that occurs in this expected splitting area C. In other words, even if splitting occurs on the inside of the wooden beam 1, the spread on the side where the opening 1a is formed is suppressed by the reinforcing member 2 placed on that surface, thus preventing splitting failure. Furthermore, since the reinforcing member 2 is placed on the surface of the wooden beam 1 where the opening 1a is formed, it is possible to avoid the reinforcing member 2 protruding from the surface where the opening 1a is formed. That is, the reinforcing member 2 can be driven into the wooden beam 1 until there is no such protrusion. In addition, since no processing is required on the side of the wooden beam 1 where the opening 1a is not formed, there is no cross-sectional loss in the wooden beam 1 due to bending.

[0024] Here, if the reinforcing member 2 were to have an open cross-section rather than a closed cross-section, the open end would widen as the crack spreads, potentially reducing its resistance to crack widening. In this embodiment, the reinforcing member 2 has an annular shape surrounding the opening 1a, and there is no widening of the open end as the crack spreads. Therefore, it is possible to improve the resistance to crack widening while keeping the thickness of the reinforcing member 2 thin. Furthermore, such annular reinforcing member 2 can exert a crack-suppressing effect in all four anticipated crack-prone areas C with just one member.

[0025] Furthermore, the width of the groove 1b is narrower than the thickness of the reinforcing member 2, which creates some resistance when driving it in. However, compared to the case where there is no groove 1b, the resistance to driving in the reinforcing member 2 is reduced, making it easier to manufacture the reinforced structure for timber structural materials. In addition, since the groove 1b is narrower than the thickness of the reinforcing member 2, the reinforcing member 2 is pressed into the timber beam 1 and fits tightly, a higher inhibitory effect against the spread of splitting is obtained compared to the case where the reinforcing member 2 is loosely fitted into the timber beam 1.

[0026] Furthermore, the width of the groove 1b is not limited to being narrower than the thickness of the reinforcing member 2. That is, a groove 1b wider than the thickness of the reinforcing member 2 may be formed outside the opening 1a of the wooden beam 1, and the reinforcing member 2 and adhesive may be placed in the groove 1b to bond and fix the reinforcing member 2 to the wooden beam 1. In other words, since the area around the reinforcing member 2 is filled with adhesive, there is no gap between the reinforcing member 2 and the groove 1b, and the reinforcing member 2 will not fall out of the groove 1b. With such a configuration, the work of driving in the reinforcing member 2 can be eliminated, making it easier to manufacture the reinforced wooden structural material structure. In addition, since the reinforcing member 2 is bonded and fixed to the wooden beam 1, a higher crack suppression effect can be obtained compared to when the reinforcing member 2 is loosely fitted to the wooden beam 1.

[0027] (Embodiment 2) Other embodiments of this invention will be described below with reference to Figures 5(A), 5(B), and 6. Components similar to those in Embodiment 1 are denoted by the same reference numerals and their descriptions are omitted. The wood structural reinforcement structure of this embodiment includes a reinforcing member 2A. This reinforcing member 2A has a tapered portion 21 on one side in the width direction of its strip shape, with the thickness decreasing towards the tip. The tapered portion 21 is driven into the surface where the opening 1a is formed. Furthermore, the tapered portion 21 has a toothed shape in which approximately triangular convex blade portions 21a are repeatedly formed in the extending direction of the strip shape. Having such a tapered portion 21 allows the reinforcing member 2A to be driven into the surface where the opening 1a is formed, even without a groove 1b.

[0028] This eliminates the need to process a groove 1b outside the opening 1a of the wooden beam 1. Furthermore, since processing the groove 1b is not required, it becomes possible to provide a reinforcing structure to existing wooden structural members of buildings. For example, even when a floor structure 7 is installed on the wooden beam 1, the reinforcing member 2A can be driven into the wooden beam 1.

[0029] Furthermore, since the sharpened portion 21 has a tooth shape in which approximately triangular convex blade portions 21a are repeatedly formed in the extending direction of the strip, the reinforcing member 2A can be driven in with even less force compared to a flat sharpened portion 21 that does not have such convex blade portions 21a.

[0030] In the embodiments described above, the reinforcing members 2 and 2A were ring-shaped, but are not limited to this. As shown in Figure 7, reinforcing members 2B, for example, roughly S-shaped, may be inserted on both sides of the longitudinal opening 1a of the wooden beam 1, crossing two assumed splitting areas C. These reinforcing members 2B have a non-ring shape. When using such a non-ring-shaped reinforcing member 2B, it is desirable to increase its thickness. The reinforcing member 2B may also have a pointed portion on one side in the width direction of its strip shape, with the thickness decreasing towards the tip, and may be driven into the surface where the opening 1a is formed from the side of the pointed portion. The pointed portion may also have a tooth shape with repeatedly formed convex blades in the extending direction of the strip shape. Alternatively, grooves matching the shape of the reinforcing member 2B may be formed on both sides of the longitudinal opening 1a of the wooden beam 1, and the reinforcing member 2B may be driven into or fitted into these grooves.

[0031] Furthermore, although the above embodiments illustrate the example of the wooden beam 1, the wooden structural material is not limited to this and also includes wooden columns. Also, the ring shape is not limited to a circle and may be a polygon.

[0032] Although embodiments of this invention have been described above with reference to the drawings, this invention is not limited to the illustrated embodiments. Various modifications and variations can be made to the illustrated embodiments within the same scope as this invention, or within the scope of equivalents. [Explanation of Symbols]

[0033] 1:Wood beam 1a:Aperture 1b: Groove 2: Reinforcement member 2A: Reinforcement member 2B: Reinforcement member 7: Floor structure 21: Cutting edge 21a: Convex blade part C: Warisaki expected area

Claims

1. A wood structural reinforcement structure for reinforcing the area around an opening formed horizontally in a wood structural material, characterized in that it has a strip shape and has a reinforcing member inserted in the width direction of the strip shape to the surface where the opening is formed, crossing the area where splitting is expected to occur in the long side direction of the wood structural material.

2. A wood structural reinforcement structure according to claim 1, characterized in that the reinforcing member has a ring shape surrounding the opening.

3. A wood structural reinforcement structure according to claim 1 or claim 2, characterized in that a groove narrower in width than the thickness of the reinforcing member is formed outside the opening of the wood structural member, and the reinforcing member is driven into the groove.

4. A wood structural reinforcement structure according to claim 1 or claim 2, characterized in that a groove wider than the thickness of the reinforcing member is formed outside the opening of the wood structural member, and the reinforcing member and adhesive are placed in the groove so that the reinforcing member is bonded and fixed to the wood structural member.

5. A wood structural reinforcement structure according to claim 1 or claim 2, wherein the reinforcing member has a pointed portion on one side in the width direction of the strip shape, which is thinner towards the tip, and is driven into the surface in which the opening is formed from the side of the pointed portion.

6. The wood structural reinforcement structure according to claim 5, characterized in that the sharp portion has convex blade portions repeatedly formed in the extending direction of the strip shape.

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