JP2010031473A - Steel plate integrated bearing wall and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing wall with a high and stable shearing resistance using one sheet of steel plate by improving the shape of the bearing wall. <P>SOLUTION: A frame part formed in a U-shape or L-shape in cross section by bending the four ends of one sheet of rectangular steel plate and a surface plate part which has an opening part with the four ends and a plurality of diagonal parts and edge walls provided to the all the peripheral edges of the opening and in which the opening part is formed symmetrically in the upward and downward directions and in the leftward and rightward directions are made of one sheet of steel plate. Since the frame part does not need to be joined to the surface plate, the lightweight bearing wall with a stable shearing resistance can be manufactured at low cost without causing the deterioration of environment due to welding, without increasing auxiliary devices and materials and labor due to the fixing of drill screws. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a structure of a load bearing wall for a house and a method of manufacturing the load bearing wall. A load-bearing wall is a wall structural element that resists horizontal force acting on a building and suppresses deformation of the building when an external force is applied to the building due to wind or earthquake. Article 20 of the Building Standards Act Those that meet the requirements stipulated in.

In general, bearing walls of residential buildings are constructed by attaching face materials such as plywood, glulam and gypsum board to the frame material of a wall frame or a wooden wall frame combined with steel shapes. It consists of In recent steel houses and the like, steel bearing walls made of steel plates are often used.
A steel bearing wall is usually composed of a frame material in which a U-shaped section steel is joined by welding or bolts and assembled in a rectangular shape, and braces or face plates attached to the frame material. Drill screws are used for bracing and attaching face plates.
Although the face plate has a higher shear resistance than the brace, it is advantageous. However, there is a problem that it is necessary to join the entire surface of the frame member and the construction becomes complicated.

When a horizontal force acts on the load bearing wall with the face plate attached to the frame member, the face plate swells in the diagonal direction and tends to peel off from the frame at the diagonal portion where the strain is concentrated. When the acting horizontal force is increased, the head such as a drill screw penetrates the face plate and the yield strength is suddenly lowered until the face plate is peeled off or not peeled off.
In order to prevent such a decrease in the proof stress and improve the function as the proof stress wall, an increase in the number of fixing points with a drill screw or the like can be mentioned, but there is a limit to increasing the number thereof, and for example, introduced in Patent Document 1 The use of such pressers is also envisaged.
JP 2006-177081 A

As shown in FIG. 1, the method introduced in Patent Document 1 is arranged on the outside of the face material 3 attached to the frame bodies 2 a and 2 b with a drill screw or the like on the entire length in the width direction of the upper and lower ends of the face plate. The pressers 4a and 4b are to be screwed to the frame bodies 2a and 2b by threading the face plate 3.
This technique is significant from the viewpoint of obtaining the required wall strength by reducing the number of attachment points to the face plate with a drill screw or the like. However, not only is the auxiliary material required as a presser required, but also labor is required, which is expensive from the viewpoint of manufacturing the bearing wall.

By the way, in a load bearing wall composed of a frame material and braces and face plates attached to the frame material, steel materials having various thicknesses are used and formed into various shapes in order to meet various needs. There is a problem that time and cost are required for the joining process when the frame material is manufactured and the face plate is attached to the frame material. Further, if the welding method is used for manufacturing the frame material, the working environment such as generation of welding fume is deteriorated. Moreover, if the plated steel material is used as the material, the plating layer disappears at the time of welding, so that it is sometimes necessary to repair the welded portion. In addition, when the material bolt joining method is adopted, there is a demerit that not only the auxiliary material is required but also labor is required.
The present invention has been devised to solve such problems, and provides a bearing wall having high and stable shear resistance using a single steel plate as a material by devising the shape. For the purpose.

In order to achieve the object, the steel plate-integrated load-bearing wall of the present invention is a rectangular load-bearing wall in which a frame member portion and a face plate portion are formed of a single steel plate, and the frame member portion is the one sheet member. The side plate portion is formed by bending the steel plate side end portion of the steel plate, and the face plate portion includes an opening portion that leaves the four side end portions and the diagonal line portion, and the entire opening portion. It has the erected wall standingly arranged in the peripheral end, It is characterized by the above-mentioned.
Further, the face plate portion has four side end portions, an opening portion that leaves a plurality of hatched portions, and an edge wall that is erected on the entire peripheral end of the opening portion, and the opening portion is symmetrical in the vertical and horizontal directions. It may be formed so that.
Further, the face plate portion may be provided with a horizontal line portion and / or a vertical line portion so as to pass through an intersection of a plurality of hatched portions.

The steel plate-integrated bearing wall of the present invention is an edge that is erected at the entire peripheral edge by performing burring on the entire circumference of the opening formed by punching a rectangular steel plate. It is manufactured by forming an opening having a standing wall to form a face plate, and then bending the four sides of the rectangular steel plate to form a frame member having an L-shaped section or a U-shaped section.
If the bending process on the four sides of the steel sheet is one step, a frame material portion having an L-shaped cross section is formed, and if it is two steps, a frame material portion having a U-shaped cross section is formed.

The steel plate-integrated load-bearing wall of the present invention is formed by integrally forming a frame member and a face plate of a conventional load-bearing wall by punching and bending a single steel plate. Furthermore, an opening is formed in the face plate with a so-called truss structure, and an edge wall is formed on the periphery of the opening. For this reason, it is sufficient to use a steel plate having a thickness that can exhibit a desired shear resistance without requiring steel materials having various shapes and thicknesses. Further, since there is no need to join the frame member and the face plate, there is no deterioration of the environment accompanying welding, and no increase in auxiliary materials and labor associated with fixing the drill screw.
Furthermore, since a welding method or drill screw fixing is not employed, a bearing wall having a desired shear resistance is stably provided. Furthermore, even if a plated steel plate is used as a material, there is no fear of a decrease in corrosion resistance because no welding method is employed.

Therefore, according to the present invention, a bearing wall having a shear resistance that is more stable than that of the conventional product can be provided at a light weight and at a low cost without accompanying environmental degradation.
In the present invention, the load-bearing wall made of a conventional frame member and face plate is formed of a single steel plate. In order to classify the part formed from a single steel plate, in this specification, it is described as “frame body” and “face plate”, but functionally the conventional “frame material” and “face plate”. Is the same.

The inventors of the present invention have intensively studied a physical strength wall structure capable of producing a bearing wall composed of a frame member and a face plate without using a welding method or a drill screw. In the process, a frame member and a face plate are formed from a single steel plate, thereby obtaining a bearing wall without using a welding method or a drill screw.
Further, when looking at the structure of a conventional bearing wall, a steel plate having an L-shaped cross section or a U-shaped cross section is assembled in a rectangular shape, and a separately prepared face plate is attached to the flange portion. Therefore, if a frame part with an L-shaped cross-section or a U-shaped cross-section is formed on the four sides of a single steel plate with a face plate, a load-bearing wall made of a single steel plate without using a welding method or a drill screw. Has been achieved.

  The present inventors further examined a physical wall structure that can reduce the amount of material used as much as possible. In that process, by forming a so-called truss structure opening in the face plate made of a single steel plate with a shape that has an edge wall on the entire periphery of the opening, it is not inferior to conventional bearing walls. It has been reached that a bearing wall having a yield strength can be obtained.

Hereinafter, first, the structure of the steel plate-integrated bearing wall of the present invention will be described in detail.
As described above, in order to form a bearing wall without using a welding method or a drill screw, the four sides of one rectangular steel plate are bent to form L-shaped sections or U-shaped sections. It suffices if the part is a frame member.
Moreover, in order to make the face plate portion exhibit the maximum proof strength with a small amount of use, the opening portion provided with the edge wall on the entire periphery thereof may be formed so as to have a so-called truss shape.

There is no restriction | limiting in the aspect which forms an opening part with what is called a truss structure. As shown in FIG. 2, it is sufficient to have a punched opening leaving the four side ends and a plurality of hatched portions. Moreover, as shown in FIG. 3, the opening formed by giving a punching process so that the horizontal line part which passes through a 4 side edge part, a several oblique line part, and the cross | intersection part of a several oblique line part may remain. Furthermore, as shown in FIG. 4, the opening which gave the punching process so that a four side edge part and a diagonal line part may be left may be sufficient.
However, even if it is an opening part of any aspect, it is required to be formed so that it may become symmetrical vertically and horizontally.

In the face plate portion in which the opening portion of the truss structure is formed, in order to exert a proof strength comparable to that of the conventional load-bearing wall, an edge wall is provided upright on the entire periphery of the opening portion in the present invention. This edge wall is intended to exert the effect of preventing out-of-plane buckling.
The edge wall is easily formed by performing burring on the entire periphery of the opening formed by punching.

Next, the procedure for producing the steel plate integrated bearing wall of the present invention will be described.
First, one rectangular steel plate is prepared. The rectangular steel plate is punched to form an opening with a truss structure as seen in FIGS. In order to facilitate the formation of the frame material part in the subsequent process, at the four corners, a side width that matches the length of the L-shaped or U-shaped frame of the L-shaped or U-shaped cross section is cut. It is preferable to perform punching at the same time so as to form notches.
Burring is performed on the opening formed by punching, and an edge wall is provided on the entire periphery of the opening to form an opening having the edge wall. The preferable formation aspect of a formation part is as having mentioned above.

The four sides of the rectangular steel plate in which the notch and the opening having the edge wall are formed are sequentially bent in the direction in which the edge wall stands. As the bending means, a roll forming method or a pressing method may be used.
In order to efficiently produce a bearing wall with excellent yield strength, a two-stage bending process is applied to the long side of the rectangular steel plate that forms the bearing wall using a roll forming method to form a U-shaped frame body. After that, it is preferable to form a frame portion having an L-shaped cross section by performing a one-step bending process on the short side.

In addition, as a bearing wall, corrosion resistance is also required from a viewpoint of durability. It is preferable to use a plated steel plate as the material steel plate having excellent corrosion resistance. As the plated steel sheet, a steel sheet on which Zn plating, Al plating, Zn—Al alloy plating, or Zn—Al—Mg alloy plating has been used is used. In particular, Al: 4.0 to 10.0 mass%, Mg : A steel plate containing 1.0 to 4.0% by mass, the balance being Zn, further containing a small amount of Ti or B, or further Zn-Al-Mg alloy plating containing Si These are preferred.
Since the steel plate-integrated bearing wall according to the present invention basically does not employ a welding method, the corrosion resistance of the plated steel plate is sufficiently exhibited and maintained.

After punching a 400 MPa class Zn-Al-Mg-based plated steel sheet with a thickness of 1.2 mm, cut to 2720 mm x 1130 mm, and forming a so-called truss structure opening constituting the face plate part, all of this opening A burring process was performed over the circumference to form an edge wall having a height of 5 mm. In addition, the width | variety of the oblique line part which comprises a truss structure was 30 mm, and the width | variety of the horizontal line part was 60 mm. Thereafter, the side edges and the upper and lower steel plate side ends are bent, the both side walls are formed in a U-shaped cross section, and the upper and lower walls are formed in a L-shaped frame section with a shape shown in FIG. A bearing wall having a length of 2600 mm, a width of 910 mm, and a depth of 60 mm was produced.
The deformation performance of the obtained bearing wall was investigated.

In addition, we investigated the deformation performance of bracing bearing walls (conventional bearing walls) with the structure and size shown in Fig. 5 using the same 400MPa grade Zn-Al-Mg plated steel sheet, and compared them. did.
In addition, the load-bearing wall of the conventional structure was 3.2 mm in the thickness of the vertical frame which is a frame material, the upper and lower frames, and the brace.

The deformation performance of the bearing wall was performed according to JIS A1414 using an in-plane shear tester shown in FIG. The deformation amount H1, H2, V3, V4 of each part when a load of P was applied was measured with a displacement meter, and evaluated by a shear deformation angle R (rad) represented by the following formula (1).
Shear deformation angle R (rad) = (H1-H2) / H- (V3-V4) / W (1)
The resulting load-shear deformation angle curve is also shown in FIG.
It can be seen that the product of the present invention having a smaller plate thickness compared to the load-bearing wall of the conventional structure has a smaller shear deformation angle at the same load and is not easily deformed.

Since the steel plate-integrated bearing wall produced in this example has no joints, it has a stable and excellent shear resistance, and there is no fear of joint failure in the joints.
Furthermore, since the steel plate-integrated load-bearing wall produced in this example forms an out-of-plane buckling prevention wall, even if it is made of a single thin steel plate, Those having a deformation resistance equal to or greater than that have been obtained. Incidentally, the weight of the load-bearing wall of the conventional structure is 38 kg / sheet, whereas the weight of the integrated load-bearing wall of the present embodiment is 19 kg / sheet.

Bearing wall introduced in Patent Document 1 Diagram showing an example of a steel plate-integrated bearing wall The figure which shows the steel plate integrated load-bearing wall produced in the Example Diagram showing an example of a steel plate-integrated bearing wall The figure which shows the conventional load-bearing wall made into the comparison object in an Example Schematic explaining the method of in-plane shear test Load-shear deformation angle curves of bearing walls investigated in the examples.

Claims (4)

  The frame member and the face plate are rectangular steel plate-integrated bearing walls formed of a single steel plate, and the frame member is a cross-sectional core formed by bending the one steel plate side end. It has a letter shape or L-shaped cross section, and the face plate part has an opening part leaving the four side end parts and a diagonal line part, and an edged wall erected on the entire peripheral end of the opening part. Steel plate integrated bearing wall.   The frame member and the face plate are rectangular steel plate-integrated bearing walls formed of a single steel plate, and the frame member is a cross-sectional core formed by bending the one steel plate side end. It has a letter shape or an L-shaped cross section, and the face plate part has four side end parts, an opening part that leaves a plurality of hatched parts, and an edge wall that is erected on the entire peripheral edge of the opening part. In addition, a steel plate-integrated load-bearing wall, wherein the opening is formed so as to be symmetrical in the vertical and horizontal directions.   The steel plate-integrated bearing wall according to claim 1, wherein the face plate portion has a horizontal line portion and / or a vertical line portion that passes through an intersection of a plurality of hatched portions.   A face plate portion formed by punching a rectangular steel plate and then forming an opening portion having an edge wall standing upright at the entire peripheral edge by performing burring on the entire periphery of the opening formed by the punching processing. The steel plate integrated type according to any one of claims 1 to 3, wherein after forming the frame material, bending is performed on four sides of the rectangular steel plate to form a frame material portion having an L-shaped section or a U-shaped section. A method of manufacturing a bearing wall.

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