JP4029937B2 - Seismic reinforcement method for wooden buildings - Google Patents

Description

  The present invention is an earthquake-proof reinforcement method for a building that can easily reinforce a large opening of an existing wooden building or the like using an earthquake-proof reinforcing body, and in particular, a wooden structure such as a shopping street where shops entrances are lined up closely. The present invention relates to a seismic reinforcement method for buildings.

  Conventionally, as a seismic reinforcement method (construction) for wooden buildings, existing walls are usually reinforced, and a new wall is provided in a large space with few walls, or the joints of columns are reinforced. Was the way. However, when reinforcing an existing wall surface, the outer wall had to be dismantled and the outer wall had to be recreated after the work was completed. In addition, when installing a new wall, it must be prepared in a state where it can be constructed indoors, which interferes with daily life and takes days, and the construction cost was expensive. At present, there are few houses that have completed earthquake-resistant reinforcement work and have not started the work of reinforcement work. In addition, the conventional frame construction method for wooden buildings is weak against earthquakes because it consists of joints between frames compared to the combination of walls. For this reason, when checking the damage situation of the Great Hanshin Earthquake, most of the collapsed wooden houses collapsed on the outer periphery of the first floor, and many of them were struck against the ground as they were.

In recent years, Japanese Laid-Open Patent Publication No. 2003-193561 has proposed a method for reinforcing earthquake resistance of a wooden building that improves the earthquake resistance performance of the entire building by reinforcing limited portions. This seismic strengthening method is to provide seismic elements in the form of a square frame at only the four corners of the building and up to the middle of the eave height. However, in Japanese Patent Laid-Open No. 2003-193561, when performing seismic reinforcement work for an existing wooden building, it is difficult to install the seismic element on the outer periphery of the existing structure as it is. Since it had to be recreated as before, it took time and money. In addition, it is impossible to perform seismic retrofitting work on existing buildings without damaging the outer walls, etc., such as shopping streets where the entrances of the shops are lined up close to each other. there were.
JP 2003-193561 A

  The method of the present invention can be applied even to an existing wooden building or the like that has almost no gap with the adjacent land, and without dismantling the existing wooden building or the like, to the large opening at the existing entrance or exit. An object of the present invention is to provide a seismic reinforcement method for a wooden building which can be directly mounted and constructed and can be reinforced at a low cost and in a short construction period.

  The present invention has been made in view of the above-mentioned present situation, and improves the effect by a simple attaching method that reinforces a large opening having insufficient strength of a building with a reinforcing body without dismantling the existing building. Is. That is, a first reinforcing body assembled in a portal ramen structure with a single member such as L-shaped steel is attached to the outside of the large opening on the first floor of an existing wooden building, and outside the first reinforcing body. The second reinforcing body or the second reinforcing body and the third reinforcing body assembled into a portal ramen structure with a single member are attached to be separably attached. In addition, a crank-shaped reinforcing member is used as the cross-sectional shape of the reinforcing member, and the first reinforcing member is reinforced with an L-shaped reinforcing plate on the front side of the corner portion, and the second reinforcing member or the second reinforcing member and the third reinforcing member on the back side of the corner portion. It is preferable to reinforce with a reinforcing angle or a corner reinforcing plate, and a base portion to which the lower portion of the reinforcing body is fixed may be formed. The large opening referred to in the present invention refers not to an opening such as a window but an opening that can enter and exit, and the crank shape referred to in the present invention refers to a stepped one-stage portion shown in FIG. Refers to the shape.

  A first reinforcing body (1) assembled in a portal ramen structure with a single member of section steel is attached to the outside of the large opening (12) on the first floor of a wooden building as in claim 1, and the first 1 The second reinforcing body (2) or the second reinforcing body (2) and the third reinforcing body (3) assembled in a portal ramen structure with a single member are attached to the outside of the reinforcing body (1) so that they can be assembled. It can be constructed even with existing wooden buildings that have almost no gap with the adjacent land, and without having to dismantle existing wooden buildings, The reinforcing bodies (1), (2) and (3) can be directly attached to the large opening (12) at the outlet, and the reinforcement work can be performed at a low cost and in a short construction period. Even if it is a building where all the parts facing the street such as shops are openings, if it is constructed according to the method of the present invention, it is possible to easily perform seismic reinforcement and to reduce the possibility of collapse. . In addition, when constructing a large opening (12) of a building facing an alley or a large opening (12) on the backyard side of a building, heavy machinery does not enter. Since a single member is manually assembled into a portal ramen structure, construction can be performed manually without the assistance of heavy machinery.

  The cross-sectional shape of the reinforcing bodies (1), (2), and (3) is a crank shape as in claim 2, and the stacking direction is made in the direction in which the opening width is narrowed. It can be constructed even with almost no existing wooden buildings and is reinforced toward the inside, so that the reinforcements (1), (2) correspond to the weight of the roof and the size of the large opening (12). ), (3), that is, the adjustment of the number of single members such as L-shaped steel to be stacked can be easily selected from those shown in FIG. 6, and sufficient strength can be obtained.

  As shown in claim 3, the cross-sectional shape of the reinforcing bodies (1), (2), (3) is a crank shape, and the stacking direction is set in the direction in which the opening width is widened. It is suitable for the case where there are some gaps with the adjacent land, and the external force applied to the building can be received in a widened state, so that the strength is further improved. Further, even if the large opening (12) is provided with a shutter at the entrance / exit, the reinforcing bodies (1), (2), (3) can be used as they are without obstructing the opening and closing of the shutter.

  Since the strength of the corner portion is improved by reinforcing the corner portion of the first reinforcing body (1) with the crank-shaped reinforcing plate (6) as shown in claim 4, the entire first reinforcing body (1). Will increase the strength of existing wooden buildings.

  The second reinforcing body (2) or the second reinforcing body (2) and the third reinforcing body (3) are provided with a reinforcing angle (7), a corner reinforcing plate (8) or a reinforcing angle ( By reinforcing with 7) and the corner reinforcing plate (8), the same effect as in claim 4 can be obtained and the reinforcing bodies (1), (2), (3) are more strongly integrated. The strength of the whole wooden building will be further increased. Further, since the corner-reinforced member cannot be seen from the front, it becomes easy to apply a free and effective reinforcing method without worrying about the design.

  By forming the base part (11) for fixing the lower part of the reinforcing bodies (1), (2), (3) as in claim 6, the superposed reinforcing bodies (1), (2 ), (3) can be firmly fixed to the base (11), and external force from above or from the lateral direction can be reliably received by the lower part, and the strength is further increased.

  1-4 is a figure which shows embodiment of this invention, This is demonstrated. (1), (2), and (3) are built on the outside of the large opening (12) such as the entrance and back door on the first floor of a wooden building, and are opened in a portal ramen structure with a single member of shape steel It is a reinforcing body that is assembled and mounted in a direction in which the width is reduced, and the cross-sectional shapes of the reinforcing bodies (1), (2), (3) are a crank shape or a continuous crank shape as shown in FIG. is there. As the shape steel, a single member of a shape steel such as an equilateral mountain shape steel or an unequal angle mountain shape steel is used, but is not limited thereto. Further, when the single members are continuously connected to form a portal ramen structure, it is preferable that the corner portions are joined at 45 degrees as shown in FIG. Further, as the equilateral mountain-shaped steel (L-shaped steel), it is preferable to use a size of 90 × 90 × 7, but the size is not limited to this, and two workers are sufficient by hand. Any length and weight can be used as long as assembly work can be performed. The first reinforcing body (1) is directly attached to the column (13) shown in FIG. 2 and the beam (14) shown in FIG. When the second reinforcing body (2) is mounted on the first reinforcing body (1), the second reinforcing body (2) is mounted in a direction in which the opening width is narrowed, and the third reinforcing body (3) is the second reinforcing body (2). When mounted on the top, it is mounted in a direction in which the opening width is further narrowed (see FIGS. 2 and 3). In addition, there are a direction in which the reinforcing bodies (1), (2), and (3) are stacked in a narrowing direction and a widening direction. In the present invention, the narrowing direction is the first reinforcement as shown in FIG. The state in which the second reinforcing body (2) and the third reinforcing body (3) are successively narrower than the body (1) is referred to as a state in which the opening is narrowed. On the other hand, the widening direction is the overlapping direction shown in FIGS. It is assumed that the opening width of the second reinforcing body (2) and the third reinforcing body (3) is increased in order from the first reinforcing body (1) by changing 180 degrees.

  (4) is used when connecting equilateral mountain-shaped steel (L-shaped steel) continuously to assemble into a portal ramen structure, or when superposing and joining reinforcements (1), (2), (3) Torcia-type high-strength bolt to be used, and M16 × 40 mm may be used as the high-strength bolt (4), but is not limited thereto. (5) is a flip anchor used when attaching the first reinforcing body (1) to the column (13) or the beam (14). When the name FA-M10N M10 × 150 mm is used as the flip anchor (5), Good, but not limited to this. (6) is a metal plate for attaching to the front side of the corner portion of the first reinforcing body (1), and is an L-shaped reinforcing plate shown in FIG. 4, and (7) is the second reinforcing body (2) and the third reinforcing body. It is a reinforcing angle of the metal plate to be attached to the back side of the corner portion of the body (3), and (8) is a metal to be attached to the back side of the corner portion of the second reinforcing body (2) and the third reinforcing body (3). It is a corner reinforcement plate of a board. (9) is a base plate of a metal plate to be fixed to the lower ends of the reinforcing bodies (1), (2), (3), and (11) is a concrete base with the chemical anchor (10) protruding and attached. (Refer to FIG. 7).

  Next, the seismic reinforcement method of the present invention will be described with reference to FIGS. Necessary parts and tools such as L-shaped steel, high strength bolt (4), flip anchor (5), reinforcing plate (6), reinforcing angle (7), corner reinforcing plate (8) are prepared in advance. First, the case where the first reinforcing body (1) is attached to the outside of the large opening (12) on the first floor by assembling a portal ramen structure with a single member of L-shaped steel will be described. First, an L-shaped steel having a number of predetermined mounting holes drilled at intervals of the pitch P shown in FIG. 4 is brought into contact with the outside of the column (13), and the protruding side of the L-shaped steel (of the mounting side) Arrange them so that the other side is on the opening side. Then, a predetermined number of holes are drilled in the pillar (13) from the mounting hole with a hand drill or the like, and the flip anchor (5) is attached. The L-shaped steel is attached with the flip anchor (5) between the bottom of the pillar (13) on both sides of the large opening (12) and the beam (14). A hexagonal coach screw is attached, and the L-shaped steel is securely fixed to the column (13). At this time, the tip of the L-shaped steel on the beam (14) side is cut at 45 degrees as shown in FIG. Next, when the L-shaped steel is brought into contact with the outside of the beam (14) and the L-shaped steel is fixed to the beam (14) with the flip anchor (5) and the hexagonal coach screw as described above, the large opening (12) is formed. It is surrounded by a gate shape with L-shaped steel. At this time, when joining the L-shaped steel attached to the column (13) to the beam (14) by cutting the tip at 45 degrees, the tips of the 45 degrees are aligned with each other at a right angle. And the protruding side of the L-shaped steel is arranged on the opening side. After that, one side of the new L-shaped steel is aligned with the protruding side of the L-shaped steel, and the protruding side of the L-shaped steel is arranged on the opening side, and a predetermined number of mounting holes are drilled in advance. The L-shaped steels are fixed to each other with a high-strength bolt (4). And when all the L-shaped steels are fixed to each other and formed into a gate shape, the cross-sectional shape becomes a crank shape as shown in FIG. 6 (a), and the first reinforcing body (1) is finished in a portal ramen structure. is there. In addition, when fixing L-shaped steels, it is not limited to the method of fixing with a high strength bolt (4), You may fix by another method, for example, welding. Also, a cross-sectional shape previously formed in a crank shape as shown in FIG. 6A at a factory or the like may be prepared, or may be formed integrally with substantially the same thickness. Further, when the first reinforcing body (1) is formed in a gate shape and attached to the column (13) and the beam (14), it is preferable to fix the column to the column (13) and the beam (14) at a predetermined pitch P. When the beam (14) is a round beam or when the shutter box is arranged, the first reinforcing body (1) is fixed only to the pillars (13) on both sides. When the first reinforcement (1) cannot be fixed to the pillar (13) due to the construction situation, it is fixed only to the beam (14) and the base (11) is also provided to support the three points. It may be better to fix it to the column (13) and the beam (14) on one side.

  Next, the case where a 2nd reinforcement body (2) is attached is demonstrated. First, one side of a new L-shaped steel is joined to the first reinforcing body (1) in the same manner as described above, and the L-shaped steel is fixed to each mounting hole with a high strength bolt (4). Further, a new L-shaped steel is prepared, and the new L-shaped steel is joined to one side of the L-shaped steel attached to the first reinforcing body (1) in the same manner as described above, and the height is increased in each mounting hole. The L-shaped steels are fixed to each other with the force bolt (4) to form a gate shape, and the cross-sectional shape is an L-shaped shape added to the crank shape as shown in FIG. The body (2) is completed by assembling a portal ramen structure with a single member. Furthermore, the case where a 3rd reinforcement body (3) is attached is demonstrated. First, one side of the new L-shaped steel is joined to the second reinforcing body (2) in the same manner as described above, and the L-shaped steel is fixed to each mounting hole with a high strength bolt (4) to form a gate shape. Further, by fixing a new L-shaped steel around the periphery, the cross-sectional shape becomes a shape in which the crank shape is continuous as shown in FIG. 6C, and the third reinforcing body (3) is a single member and is a portal type. It is completed by laminating a ramen structure (see FIGS. 1, 2 and 3). When the reinforcing bodies (1), (2), and (3) are assembled, components that have L-shaped steels attached in advance or components that have a cross-sectional shape formed into a crank shape are sequentially assembled and attached. May be.

  Then, the part (corner part) where the front-end | tip of L-shaped steel was joined at 45 degree | times is reinforced. A corner reinforcing method at this time will be described. First, an L-shaped reinforcing plate (6) is attached to the front corner portion of the first reinforcing body (1) (see FIG. 4). This reinforcing plate (6) may be attached before the second reinforcing body (2) is overlapped, and further, the 45-degree tips of the L-shaped steels are joined together at a right angle and the column (13). It is preferable to attach the reinforcing plate (6) together when fixing to the beam (14). Next, the back sides of the corner portions of the second reinforcing body (2) and the third reinforcing body (3) are reinforced. A corner reinforcing method at this time will be described. First, the reinforcing angle (7) is brought into contact with the rising side on the back side of the corner of the second reinforcing body (2) and the third reinforcing body (3) as shown in FIG. 4 (a) and fixed with the high strength bolt (4). To do. Furthermore, if the corner reinforcing plate (8) is arranged as shown in FIG. 4 (b) on the back side of the corner portion of the second reinforcing body (2) and the third reinforcing body (3) and fixed with the high strength bolt (4). good. Note that it is not always necessary to reinforce the corner portion at this time, and only one of the reinforcing angle (7) or the corner reinforcing plate (8) may be used as necessary. Further, the order of attaching the reinforcing angle (7) and the corner reinforcing plate (8) may be performed in an order that facilitates construction. Further, when the reinforcing plate (6), the reinforcing angle (7) and the corner reinforcing plate (8) are fixed, the method is not limited to the method of fixing with a high-strength bolt (4), but other methods such as welding. It may be fixed by a method.

  In the present invention, the strength of the large opening (12) is obtained by attaching the second reinforcing body (2) and the third reinforcing body (3) so as to overlap each other on the first reinforcing body (1). This is a seismic reinforcement method that can greatly improve the strength of the joints of the columns (13) and beams (14). In addition, as the seismic reinforcement work for the large opening (12), the number of the shape steel is adjusted according to the number of floors of the existing building, the size of the large opening (12), the weight of the roof, and the like. That is, whether to attach only the first reinforcing body (1), the second reinforcing body (2), or the third reinforcing body (3) is determined in advance. At this time, the 2nd reinforcement body (2) and the 3rd reinforcement body (3) are used by putting two L-shaped steels in a crank shape. They may be combined to fit more finely. Moreover, when fixing L-shaped steels, it is not limited to the method of fixing with a high strength bolt (4), You may fix with other methods, such as welding. Further, it may be prepared in advance at a factory or the like whose cross-sectional shape is formed in a crank shape as shown in FIG. When there is a margin between the adjacent ground and the second reinforcing body (2) and the third reinforcing body (3) are mounted on the first reinforcing body (1), the large opening They may be mounted in combination so as to spread from (12). Also, since the L-shaped steel corners are stacked at an angle of 45 degrees with respect to the building, it is always possible to obtain the same compressive strength in the horizontal and vertical directions of the building. It will be able to withstand the external force. Moreover, since the reinforcing bodies (1), (2), and (3) are aggregates of small members, there are no swords on the appearance and the design is high. Further, according to the method of the present invention, the seismic reinforcement work can be completed within a short period of time within 4 days up to 1.8 m and up to 3.6 m within 6 days up to 1.8 m.

  FIG. 7 shows a seismic reinforcement method in which a base portion (11) for fixing the lower portions of the reinforcing bodies (1), (2), and (3) is formed, which will be described. A base plate (9) shown in FIG. 7 (b) having a width capable of mounting the required number of reinforcing bodies (1), (2), (3) is prepared in advance and the chemical anchor (10) is prepared. A foundation (11) shown in FIG. 8 (c) attached with the upper part protruding is provided outside the column (13). First, the hole of the base plate (9) is inserted into the chemical anchor (10), the base plate (9) is placed on the base portion (11), and fixed with a hexagon nut (not shown). Next, the reinforcing bodies (1), (2), (3) are assembled and attached to the outside of the large opening (12) in a portal ramen structure as described above. And it is good to fix the lower part of the said reinforcement body (1), (2), (3) with a baseplate (9) with welding. At this time, the formation of the base part (11) is not necessary when the grounding part below the reinforcing bodies (1), (2), (3) is hard. 7 (a) is an explanatory view of the main part attached to the pillar (13) as viewed from above, FIG. 7 (b) is a plan view of the base plate (9), and FIG. It is explanatory drawing which shows the principal part cross section of a base part (11). GL represents a ground line.

  If the method of the present invention is an existing building that is not only wooden, but also a steel building, etc., there is a place where the reinforcing bodies (1), (2), (3) can be securely fixed, the seismic reinforcement work is performed. It will be possible to do.

It is explanatory drawing which shows embodiment of this invention. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is explanatory drawing which shows the reinforcement state of the corner part front side of this embodiment. It is explanatory drawing which shows the reinforcement state of the corner part back side of this embodiment. It is explanatory drawing which shows the selection state of the overlap condition of the reinforcement body of this embodiment. It is explanatory drawing which shows the principal part of another embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st reinforcement body 2 2nd reinforcement body 3 3rd reinforcement body 6 Reinforcement plate 7 Reinforcement angle 8 Corner reinforcement plate
11 Foundation
12 Large opening

Claims (6)

  A first reinforcing body (1) assembled in a portal ramen structure with a single member of a shape steel is attached to the outside of a large opening (12) on the first floor of a wooden building, and the first reinforcing body (1) The second reinforcing body (2) or the second reinforcing body (2) and the third reinforcing body (3) assembled in a portal ramen structure with the single member are attached to the outside of the second reinforcing body (2) so that they can be stacked together. Seismic reinforcement method for wooden structures.   The method for seismic reinforcement of a wooden building according to claim 1, wherein the reinforcing bodies (1), (2), (3) have a crank-like cross-sectional shape, and the direction in which the reinforcing bodies (1), (2), (3) are stacked is reduced.   The method for seismic reinforcement of a wooden building according to claim 1, wherein the reinforcing bodies (1), (2), (3) have a crank-like cross-sectional shape, and the assembling direction of the reinforcing bodies is a direction in which the opening area is widened.   The earthquake-proof reinforcement method of the wooden building of Claim 1, 2 or 3 with which the front side of the corner part of the said 1st reinforcement body (1) was reinforced with the L-shaped reinforcement plate (6).   The back side of the corner portion of the second reinforcing body (2) and the third reinforcing body (3) is reinforced by the reinforcing angle (7) or the corner reinforcing plate (8) or the reinforcing angle (7) and the corner reinforcing plate (8). A method for seismic reinforcement of a wooden structure according to claim 1, 2 or 3. The earthquake-proof reinforcement method of the wooden building of Claim 1, 2, or 3 in which the base part (11) for fixing the lower part of the said reinforcement body (1), (2), (3) was formed.