JP4607978B2 - Reinforcement structure of bracing in wooden buildings - Google Patents

Description

  The present invention relates to a reinforcing structure and a reinforcing method for performing seismic reinforcement of a frame including a bracing of a building in renovation work of a wooden building.

  When renovating a wooden building, not only simply renovating the interior, but also providing seismic reinforcement. This seismic reinforcement portion is a frame part where the bracing is mainly provided after the interior wall is removed.

  Conventionally, as a reinforcement structure for bracing, it is common practice to attach a coupling fitting to the coupling position between the bracing and the column, foundation and / or beam, and fix this to the side of the joint position with a wood screw or the like. ing. However, this reinforcing structure does not reinforce the entire bracing part, but merely increases the joint strength of the joint part. In renovation work, this type of fitting cannot be attached because the outer wall is not removed and exposed to the outer surface of the frame.

On the other hand, the present applicant has previously developed a bracing structure in a wooden building shown in Patent Document 1 below. According to this bracing structure, by placing a horizontal bracing support at the intermediate position in the height direction of the column in a frame with bracing and connecting with bracing, the span of bracing is shortened, Support rigidity by bracing is increased.
Japanese Patent No. 3739372

  The present invention is a further development of the bracing structure, the purpose of which is seismic resistant in the plane of a frame surrounded by a base, a beam and a pair of columns, with the bracing arranged between the columns. The present invention provides a reinforcing structure and a reinforcing method for bracing in a wooden building that can be reinforced and that is simple in structure and construction.

  In order to achieve the above object, the reinforcement structure for bracing in a wooden building according to the present invention is such that the bracing 5 is inclined between a pair of columns 4 and 4 erected between the base 2 and the beam 3. In the wooden building having the frame 1 arranged, a pair of reinforcing metal plates 10 and 10 are arranged in parallel with the base 2 and the beam 3 at the upper and lower positions between the pillars 4 and 4, and both ends of each of the pillars 4 and 4, and the upper and lower side surfaces of the bracing 5 and the side surfaces of the reinforcing metal plates 10 are connected via a plurality of fixtures B.

  The pair of reinforcing metal plates 10 and 10 are made of flat steel rods that are wide in the vertical direction, and connecting flange portions 10a and 10a are formed in an L shape at both ends of the flat steel plates. A large number of mounting holes 18 are formed in advance on the side surfaces of the reinforcing metal plates 10 into which the fixtures B made of nails or wood screws are inserted through the flanges 10a and 10a. It is desirable that

  Moreover, in the reinforcement structure of the bracing in the wooden building according to the present invention, the reinforcing metal plates 10 and 10 and the base 2 or the beam 3 are connected to each other via a pair of left and right vertical coupling fittings 12 and 12 orthogonal thereto. It is characterized by being connected.

  The vertical coupler 12 is formed of a long bolt tool, and a pipe 16 into which the vertical coupler 12 made of the long bolt tool is inserted is fixed to the side surface of the reinforcing metal plate 10 and faces the pipe 16. A fixing bracket 14 having a shape of a fixing cylinder 14 b is fixed to the upper surface of the base 2 and the lower surface of the beam 3, and the long bolt is attached to the pipe 16 provided on the side surface of the reinforcing metal plate 10. A vertical coupler 12 made of a tool can be inserted, and a male screw portion 12a at the tip can be screwed and fixed to a female screw portion formed on the inner periphery of the fixing cylinder portion 14b of the fixing bracket 14.

  It is desirable that the fixing bracket 14 has a shape in which the fixing cylinder portion 14b is formed to protrude from the center of a washer 14a fixed to the upper surface of the base 2 and the lower surface of the beam 3.

  The reinforcement method of the bracing in the wooden building according to the present invention is a method for constructing the reinforcing structure by reforming or the like, and a pair of reinforcing metal plates 10, 10 is arranged in parallel with the base 2 and the beam 3, and both end flange portions 10 a and 10 a are connected to the columns 4 and 4 by a screw fixture B, and the upper and lower side surfaces of the bracing 5 and the reinforcing metal plates 10 and 10 are connected to each other through a plurality of fixtures B, and each of the reinforcing metal plates 10 and 10 and the base 2 or the beam 3 is connected to a pair of left and right vertical coupling fittings 12 orthogonal thereto. It is characterized by being connected via.

  Therefore, according to the present invention, the reinforcing metal plates 10 arranged above and below between the columns 4 are rigidly coupled between the columns 4 and the span of the bracing 5 is substantially shortened. The strength / rigidity of the bracing 5 is increased.

  In addition, it is possible to prevent the inclination deformation of the column 4 with respect to the base 2 and the inclination deformation with respect to the beam 3 as much as possible by the tensile resistance of the vertical coupling fitting 12.

  Furthermore, adjustment with the height position of the reinforcing metal plate 10 can be easily performed by adjusting the screwing of the vertical coupling fitting 12.

FIG. 1 is a perspective view showing a frame of a crossing point in a wooden building to which the present invention is applied, wherein (a) is before renovation and (b) is after renovation.
First, as shown in FIG. 1 (a), this frame 1 is basically composed of a base 2 and a beam 3 installed on a fabric foundation (not shown). A pair of pillars 4 erected between them and the struts 5 arranged diagonally between the pillars 4 and an intermediate position between the pillars 4. And a stud 6. In the drawing, the cross-sectional dimensions of the base 2, the beam 3 and the column 4 are rectangular and the same dimensions. However, in the case of the beam 3, a material slightly taller than the base 2 is used. In this case, the cross sectional dimension may be slightly smaller than the cross section of the base 2. In addition, the joints between the pillars 4 and 6 and the base 2 and the beam 3 generally use a traditional woodwork joint structure with tenons and mortises. Reinforcement with box hardware etc. may be made.

  Furthermore, the bracing 5 is about half the thickness of the material of the pillar 4, the lower end is at the crossing position of the base 2 and one pillar 4, and the upper end is between the beam 3 and the other pillar 4. The crossing position is made into a shallow fitting structure and is connected via a horizontal member such as a bite or a through bolt. The bracing 5 and the inter-column 6 cross each other, but due to the relationship between the members, a notch is formed on the inter-column 6 side so that the bracing 5 is passed.

  The above is the basic structure of the frame 1 in the bracing part. In addition to this, in the present invention, as shown in FIG. 1B and FIGS. The structure 9 is arranged. Each reinforcing structure 9 is disposed horizontally between the columns 4, and has a connecting flange portion 10 a bent in an L shape at both ends thereof connected to each column 4 facing surface via a plurality of screw fixtures B. Further, a reinforcing metal plate 10 made of a flat steel plate having a wide width and a required thickness and a vertical coupling metal fitting 12 made of a pair of left and right screw rods connecting the reinforcing metal plate 10 and the beam 2 or the base 1 are provided. A U-shaped notch 6 a (FIG. 3A) into which the reinforcing metal plate 10 is inserted is formed on the front surface of the stud 6 facing the reinforcing metal plate 10.

The vertical coupling metal 12 is formed of a long bolt device having a head portion 12b at one end and a male screw portion 12a at the other end. The male threaded portion 12a of the vertical coupling metal 12 is fixed to the upper surface of the base 2 or the lower surface of the beam 3 by screwing the washer 14a into the fixing metal fitting 14 fixed via the screw fixing tool B, and the other end is a reinforcing metal plate. 10 is inserted into a pipe 16 fixed to one side by welding 16a.
The fixing metal fitting 14 is a metal fitting having a shape in which a fixing cylinder portion 14b having an internal thread formed on the inner periphery thereof is formed to protrude from the center of the washer 14a.

  A large number of attachment holes 18 (shown only in FIG. 3) are formed in the vicinity of the pipe 16 of each reinforcing metal plate 10 and at the crossing position with the reinforcement 5. The screw fixing tool B is screwed into (only FIG. 2 is displayed), so that the reinforcing metal plates 10 and the upper and lower side surfaces of the bracing 5 are integrated by screw connection.

  With these configurations, the columns 4 are rigidly connected to each other by the reinforcing metal plates 10, and the inclination deformation of the columns 4 with respect to the base 2 and the inclination deformation with respect to the beams 3 are prevented as much as possible by the tensile resistance of each vertical coupling fitting 12. By connecting the bracing 5 to each reinforcing metal plate 10, the span of the bracing 5 is shortened, so that the strength and rigidity of the bracing 5 can be increased by the shortening.

  At the time of renovation, if the interior wall material is removed, the frame 1 is exposed as shown in FIG. 1A. In this state, the upper and lower reinforcing metal plates 10 are horizontally disposed between the columns 4. Then, the position of the mounting hole 18 is adjusted to the vertical position of the brace 5 and fixed by the screw fixture B. Next, the vertical coupling fitting 12 is inserted into the pipe 16 fixed to the reinforcing metal plate 10, and the front male screw portion 12 a of the vertical coupling fitting 12 is screwed and fixed to the fixing fitting 14 fixed to the base 2 and the beam 3. Thus, all the seismic reinforcement work is completed within the plane of the frame 1 including the bracing 5.

  FIG. 4 is a schematic diagram showing a result of measuring a displacement when a horizontal force due to an earthquake acts on the conventional frame 1. First, FIGS. 4A to 4C show the deformation and the broken state when a tensile force is applied to the bracing 5, and the normal state frame 1 shown in FIG. When a horizontal force having a predetermined seismic intensity is applied to the column 4, the column 4 tilts in the direction of the arrow, and the beam 3 moves horizontally. Although it depends on the magnitude of the horizontal force depending on the seismic intensity, in the measurement experiment, as shown in (b), the beam 5 does not come off even if the beam 3 is displaced by about 100 from the base 2 in the horizontal direction. Although there is a resilience, the upper side of the bracing 5 is pulled out from the crossing position of the beam 2 and the column 4 when the beam 3 is displaced by 200 from the base 2 as shown in the circle of (c). Was confirmed.

4 (d) to 4 (f) show the deformation and the destruction state when the compressive force is applied to the bracing 5 and is shown in the normal state frame 1 shown in FIG. Thus, when a horizontal force of a predetermined depth is applied, the column 4 is inclined in the direction of the arrow, and the beam 3 is horizontally moved in the opposite direction. In the measurement experiment, as shown in (e), even when the beam 3 is displaced from the base by about 100 in the horizontal direction, the beam 5 bends and has a restoring property, but when the beam 3 is displaced from the base 2 by 200, It was confirmed that the compressive stress would cause buckling failure as shown in the circle of (f).

  On the other hand, FIG. 5 is a schematic diagram showing a result of measuring a displacement when a horizontal force is applied to the frame 1 to which the reinforcing structure 9 is added. First, FIGS. 5 (a) and 5 (b) show the displacement when a tensile force is applied to the bracing 5. The normal structure shown in FIG. 5 (a) has a predetermined seismic intensity as shown by the left arrow in the figure. When a horizontal force is applied, the column 4 tilts in the direction of the arrow, and the beam 3 moves horizontally. In the measurement experiment, as shown in (b), the beam 3 is moved horizontally from the base 2 in FIG. It was confirmed that even if a horizontal force is applied with a load equivalent to a displacement of up to about 200 shown in c), the beam 5 does not come off and has a restoring property.

  4 (c) and 4 (d) show the displacement when a compressive force is applied to the bracing 5. The normal frame 1 shown in FIG. 4 (c) has a predetermined depth as shown by the right arrow in the figure. When the horizontal force is applied, the column 4 tilts in the direction of the arrow, and the beam 3 moves horizontally in the opposite direction. However, in the measurement experiment, as shown in FIG. It was confirmed that even when a horizontal force is applied with a load equivalent to a displacement of about 200 shown in FIG. 4 (f), the beam 5 only bends and has resilience.

  In addition, the vertical coupling metal fitting 12 in the said embodiment should just be a member which can couple | bond the reinforcement metal plate 12 and the base 2 or the beam 3 by rigid coupling. For example, the reinforcing metal plate 12 is formed by a metal plate body having L-shaped flange portions at both ends or one end, and the both ends and the base 2 or the beam 3 are fixed via a bolt connector or the like. May be. In this case, the pipe 16 provided on the reinforcing metal plate 12 can be omitted.

  In the above embodiment, the case where the earthquake-proof reinforcement is performed by the reinforcing structure 9 in the frame including the bracing with the interior wall removed at the time of renovation has been described. Of course, the body 9 may be provided.

(A), (b) is a perspective view which shows the frame before and behind renovation in the bracing part of a wooden building. It is the A section enlarged view of FIG.1 (b). (A) is the B section enlarged view of FIG.1 (b), (b) is a perspective view of a vertical coupling metal fitting. (A)-(f) is explanatory drawing which shows typically the displacement when a seismic force acts on the bracing location before remodeling. (A)-(d) is explanatory drawing which shows typically the displacement when an earthquake force acts on the bracing location after remodeling.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Frame 2 Base 3 Beam 4 Column 5 Bracing 6 Interstitial 9 Reinforcement structure 10 Reinforcement metal plate 10a Flange part 12 Vertical coupling metal part 12a Male thread part 12b Head part 14 Fixing metal part 14a Washer 14b Fixing cylinder part 16 Pipe 16a Welding 18 Mounting hole B Fixing tool

Claims (1)

In a wooden building having a frame in which braces are arranged in an inclined state between a pair of pillars erected between a foundation and a beam,
A pair of reinforcing metal plates (10) are arranged in parallel with the base and beams at the upper and lower positions between the columns, both ends thereof are connected to the columns, and upper and lower side surfaces of the braces and the reinforcing metal plates. Connecting the side surface of (10) via a plurality of fixtures ;
The pair of reinforcing metal plates (10) is made of a flat steel plate having a wide width in the vertical direction, and connecting flange portions (10a) are formed in an L shape at both ends of the flat steel plate. A large number of mounting holes (18) are formed in advance on the side surfaces of the reinforcing metal plates (10) through which flanges (10a) are inserted and into which the fixtures made of nails or wood screws are inserted. The upper and lower side surfaces of the braces are connected to the side surfaces of the reinforcing metal plates (10) via the plurality of fixing tools through the mounting holes (18).
Each of the reinforcing metal plates (10) and the base or beam are connected via a pair of upper, lower, left, and right vertical coupling fittings (12) orthogonal thereto, and each of the four vertical coupling fittings (12). Is formed by a long bolt tool having a head (12b) at one end and a male threaded part (12a) at the other end, and each vertical fitting (12) is one side of each reinforcing metal plate (10). The head (12b) is inserted into the pipe (16) fixed to the left and right of the part, and the end face of the pipe (16) is prevented from coming off, and the male screw part (12a) is the upper surface of the base or the lower surface of the beam. A reinforcing structure for bracing in a wooden building, wherein the left and right fixing brackets (14) are fixed by being screwed into inner peripheral female screws of a central fixing cylinder (14b) .

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