JP2012021303A - Connecting metal fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connecting metal fitting which is used for installing a column to a horizontal member of a base or the like and is capable of demonstrating a seismic control property at a low cost.SOLUTION: The connecting metal fitting includes: a root part 11 to be embedded in the horizontal member of a base 36 or the like; an insertion plate 14 to be inserted in a column 41, a pin hole 17 provided on a part as end as possible of the insertion plate 14; and a window 20 provided by cutting a range from the vicinity of the pin hole 17 to the vicinity of the root part 11. Thus, the insertion plate 14 is easily deformed, and when a load acts in the direction of separating the horizontal material and the column 41 due to an earthquake or the like, stress is concentrated on the corner part of the window 20 or the like, plastic deformation is caused in an early stage, energy is efficiently absorbed, and the seismic control property is smoothly demonstrated. Also, the method of assembling the connecting metal fitting or the like is the same as before and there is not a big difference in a manufacture cost as well.

Description

  The present invention relates to a connection fitting used for installing a column on a cross member such as a base or a beam.

  The wooden frame construction method, which is widely used as a construction method for houses, etc., constructs the building skeleton by combining rods such as foundations, pillars and beams, and in order to secure its strength, adjacent rods are It is necessary to connect firmly. For this reason, measures such as processing a tenon on the end face of the bar are taken, but in recent years, with the widespread use of precut technology, various metal fittings are increasingly used as substitutes for the tenon. Furthermore, in recent years, in order to prevent the column from falling off due to an earthquake, measures such as the use of a hole-down hardware in combination to firmly integrate the column and the foundation have been advanced.

  In the wooden frame construction method, an example of a connecting metal fitting used for installing a pillar on a base is shown in FIG. This connecting bracket is composed of a shaft that is inserted into the base and a U-shaped insertion plate that is inserted into a slit machined into a pillar, and the base and the base via a drift pin that is driven from the side of the pillar. Integrate the pillars. Even if a load is applied in the direction of pulling out the pillar from the base after the installation of the pillar on the base, the connecting bracket will resist this and the pillar will not fall off.

  Thus, by using various metal fittings and hole-down hardware, sufficient earthquake resistance can be secured even in the wooden frame construction method. Further, in recent years, not only ensuring seismic resistance, but also development of metal fittings having seismic control properties that can absorb energy at the time of an earthquake has been promoted, and techniques such as the following patent documents have been proposed. Reference 1 is an invention related to a vibration damping structure for a joint between a foundation and a pillar. A web of a metal fitting (elastic-plastic damper) that connects two members is provided with a V-shaped cutout, and this elastic-plastic deformation is utilized. It is characterized by absorbing energy during an earthquake. Reference 2 is an invention relating to a horn bracket that connects a base and a pillar, and is characterized in that the outer periphery of a rod-like core material is covered with a flexible material such as rubber. Is secured.

Japanese Patent No. 3790755 Japanese Patent Laid-Open No. 2002-317496

  In the wooden frame construction method, pillars may be continuously arranged at intervals of about 1m (about 1.8m). Even when limited to a single building, there are many connecting brackets as shown in Fig. 8. Will be used. Therefore, if this metal fitting can be seismically controlled, the energy that can be absorbed in the event of an earthquake increases, and the reduction of damage to the building can be expected. However, since many are used, sufficient consideration is required for workability and manufacturing cost.

  The present invention has been developed based on such a situation, and an object of the present invention is to provide a connecting metal fitting that can be used for installing a column on a cross member such as a base or a beam and that can exhibit vibration control at low cost.

  The invention according to claim 1 for solving the above-mentioned problem is a connection fitting for connecting a column to a cross member such as a base or a beam, and a root portion embedded in a shaft hole formed in the cross member, An insertion plate inserted into a slit formed in the axial direction from the end surface of the column and having a pin hole for inserting a drift pin driven from the side surface of the column, the insertion plate from the pin hole A connecting metal fitting having a window cut out in the range up to the base portion.

  The present invention is a connecting bracket for connecting a cross member and a column in a letter shape, and the basic shape is the same as before, and the root part embedded in the shaft hole processed into the cross member and the column It is the structure which the insertion board inserted in the processed slit integrated. The cross member is a bar laid horizontally such as a base or a beam. The shaft hole is a hole having a circular cross section that is processed on the upper surface of the cross member and extends from the contact surface with the column toward the opposite surface. On the other hand, the slit is a cut having a thickness of about several millimeters and extends in the axial direction from the end face of the column.

  The root portion embedded in the shaft hole is integrated with the cross member by a drift pin driven from the side surface of the cross member. For this reason, it is necessary to form a fixing hole for allowing the drift pin to pass through on the side surface of the root portion, and it is also necessary to process a round hole in the lateral member at a position concentric with the fixing hole. . A plurality of fixing holes and round holes may be provided depending on the required strength. In addition, since the root portion is embedded in the shaft hole, it is usually formed in a columnar shape, but may be formed in a plate shape for reasons such as cost reduction. If a plate-like shape is assumed, the lateral width is made equal to the diameter of the shaft hole, and the side end surface of the root portion is in contact with the inner peripheral surface of the shaft hole to suppress loosening.

  The insertion plate has a plate shape corresponding to the thickness of the slit and is integrated with the root portion by welding or the like. In addition, the insertion plate has a form in which only one sheet is simply arranged and two sheets having the same shape arranged in parallel, and the slits are arranged in one row or two rows according to this. And the insertion plate inserted into the slit is integrated with the column by a drift pin driven from the side of the column. Therefore, it is necessary to form a pin hole for allowing the drift pin to pass through the insertion plate, and it is also necessary to process a horizontal hole in the column at a position concentric with the pin hole. A plurality of pin holes and side holes may be provided depending on the required strength.

  The window is a part cut out from the inside of the insertion plate. However, the window may not be provided at an arbitrary position and is limited to a range from the connection point with the root portion to the pin hole. By providing this window, the cross-sectional area of the insertion plate is reduced and the strength is reduced. Moreover, when a tensile load is applied between the root portion and the pin hole, stress concentrates on the corners of the window and the like, and deformation is likely to occur. Therefore, if an excessive load is applied due to an earthquake or the like, the insertion plate can be plastically deformed and absorb energy before the pillar breaks, reducing damage to the building.

  When a plurality of pin holes are provided, the window is positioned closer to the root part than all the pin holes. In addition, it is assumed that the window is in a closed shape and is not open to the outside. The specific shape of the window is not limited and can be determined freely. Further, a plurality of windows may be provided for one insertion plate.

  The invention according to claim 2 limits the shape of the insertion plate, and the insertion plate includes a frame-shaped frame plate in which a window is formed, a tail plate protruding from the frame plate and having a pin hole, It is characterized by comprising. The frame plate has a frame shape in which the inside of the steel plate is cut out so that only the outer frame remains, and the cut out inside forms a single window. The frame plate is not limited to a rectangular shape, and may be accompanied by a curve such as an oval shape or an oval shape. In addition, one end side of the frame plate is in contact with the root portion, and both are integrated by welding.

  The tail plate is a portion for providing a pin hole, protrudes from the outer edge of the frame plate, and is naturally located on the opposite side of the root portion. As a rule, the tail plate and the frame plate are cut out integrally from a single steel plate. Like the present invention, by forming the insertion plate with the frame plate and the tail plate, when a tensile load is applied, a bending moment is generated in a part of the frame body, and the stress is concentrated on the corner portion or the like. Therefore, plastic deformation is caused smoothly and energy can be absorbed efficiently.

  The invention according to claim 3 limits the shape of the frame plate, and part or all of the sides constituting the frame plate are bent in a “<” shape. The frame plate may be linear like the frame or the like, but all of the sides constituting the frame plate or two opposite sides may be bent. With this configuration, when a tensile load is applied, stress concentrates also on the bent portion of the frame plate, so that plastic deformation is smoothly caused and energy can be absorbed efficiently.

  As in the first aspect of the present invention, a connecting bracket is constituted by a root portion embedded in a cross member and an insertion plate inserted into a column, and a pin hole is provided at an end portion of the insertion plate as much as possible. By inserting a window by cutting out the range from the vicinity of the pin hole to the vicinity of the root portion, the insertion plate is easily deformed. When a building using this connecting bracket encounters an earthquake and a load acts in the direction to separate the horizontal member and the column, stress concentrates on the corners of the window, causing plastic deformation at an early stage, Energy can be absorbed efficiently and the vibration control can be demonstrated smoothly.

  In addition, the method of assembling the product of the present invention and the method of processing the cross member and the column are the same as those of the conventional connecting fitting, and in these respects, problems such as an increase in working time do not occur. In addition, even at the stage of manufacturing the product of the present invention, only the shape when the insertion plate is cut out from the steel plate is different, and the increase in manufacturing cost is slight. For this reason, even if a large number of units are used, the orderer is not overburdened and contributes to the spread of buildings with seismic control. In addition, the product of the present invention can prevent damage to pillars and the like by deforming itself, and contributes to the efficiency of building reconstruction.

  As in the invention described in claim 2, by forming the insertion plate with a frame plate and a tail plate, when a tensile load is applied, a part of the frame plate has an angle of intersection with respect to the direction in which the load is applied. Since a bending moment is generated at the side and stress is concentrated at the corners, plastic deformation is likely to occur. Further, as in the invention described in claim 3, by bending the sides of the frame plate, stress is concentrated on the bent portion, so that it becomes easier to cause plastic deformation.

It is a perspective view which shows the example of a shape of the connection metal fitting by this invention. It is a perspective view which shows the state which assembled FIG. It is a perspective view which shows the state which the tensile load acted on the connection metal fitting and plastically deformed. It is a perspective view which shows the connection metal fitting which made the base part plate shape. It is a perspective view which shows the example of a shape of a frame. It is a side view which shows the example of a shape of a connection metal fitting. It is a perspective view which shows the connection metal fitting which made two insertion plates. It is a perspective view which shows the example of a shape of the connection metal fitting conventionally used in the connection part of a base and a pillar.

  FIG. 1 shows an example of the shape of a connecting metal fitting according to the present invention. The connecting metal fitting in this figure is used for installing the pillar 41 on the upper surface of the base 36, and both the base 36 and the pillar 41 are made of wood. The base 36 is placed on the upper surface of the concrete base 31, and a nut 34 is screwed onto the tip of the anchor bolt 32 penetrating the base 36. A large-diameter washer 33 is interposed under the nut 34 to relieve the pressure acting on the base 36.

  The connecting fitting is obtained by integrating the base portion 11 and the insertion plate 14 by welding, and the base portion 11 has a columnar shape and is embedded in the shaft hole 37 reaching the bottom surface from the top surface of the base 36. Two fixing holes 12 are formed vertically on the side peripheral surface of the base portion 11, and two round holes 38 intersecting the shaft hole 37 and penetrating on the opposite surface are formed on the side surface of the base 36. Has been processed. The position of the round hole 38 is adjusted so as to be concentric with the fixed hole 12 when the root portion 11 is buried to a predetermined depth. In addition, the drift pin 39 is driven after aligning the fixing hole 12 concentrically with the round hole 38 to integrate the base 36 and the root portion 11. The drift pin 39 is firmly held by friction with the round hole 38 and does not fall off naturally.

  The insertion plate 14 occupying the upper half of the connection fitting is composed of a frame plate 15 and a tail plate 16, and is inserted into a slit 42 processed at the lower end of the column 41. The frame plate 15 has a square shape and a literal frame shape with a window 20 cut out. The horizontal width of the frame plate 15 is equal to the width of the column 41 in order to easily cause plastic deformation. The tail plate 16 protrudes right above the center of the upper portion of the frame plate 15, and two pin holes 17 are formed on the top and bottom thereof.

  The slit 42 processed into the column 41 has a depth sufficient to accommodate the entire frame plate 15 and tail plate 16, and the side surface of the column 41 has two horizontal holes 43 extending vertically through the opposite surface. Has been processed. The position of the horizontal hole 43 is adjusted to be concentric with the pin hole 17 when the insertion plate 14 is inserted to a predetermined depth. In addition, the drift pin 45 is driven after aligning the pin hole 17 concentrically with the lateral hole 43 so that the column 41 and the insertion plate 14 are integrated.

  FIG. 2 shows the assembled state of FIG. The lower surface of the column 41 is placed on the upper surface of the base 36, and a connection fitting is embedded so as to penetrate the boundary between the base 36 and the column 41. However, only the side end face of the insertion plate 14 inserted into the slit 42 is visible. Further, the end faces of the drift pins 39 and 45 penetrating through the connection fitting are also visible. Thus, the external appearance when the column 41 is installed on the base 36 is not different from the conventional connecting metal fitting.

  FIG. 3 shows a state in which the connecting metal fitting of FIG. 1 is plastically deformed by a tensile load. When a tensile load is applied between the fixing hole 12 and the pin hole 17 of the connection fitting shown in FIG. 1, the frame plate 15 extends up and down while narrowing as shown in the upper right of the drawing. This is because a bending moment is generated on two horizontally extending sides of the four sides of the frame 15 and stress is concentrated on the corners of the frame 15 to cause plastic deformation. Therefore, when the width of the window 20 becomes narrow due to plastic deformation, the bending moment decreases and the progress of the deformation slows down.

  The lower part of FIG. 3 shows the connecting portion after the connecting fitting is plastically deformed. When an excessive tensile load acts between the base 36 and the column 41, the frame plate 15 is plastically deformed to absorb energy. Therefore, the load acting on the drift pins 39 and 45 is relieved, and cracks of the base 36 and the pillar 41 can be prevented. Further, clearance is generated on the upper surface of the base 36 and the lower surface of the column 41, but the column 41 does not fall off the base 36, and a certain strength can be maintained. After the connecting fitting is plastically deformed, the connecting fitting can be exchanged by removing the drift pins 39 and 45 and moving the column 41 horizontally.

  FIG. 4 shows a connection fitting having a base portion 11 in a plate shape. 1 has a base portion 11 that is cylindrical, but is not necessarily limited to this, and is formed into a plate shape as shown in the figure, and is integrated with the frame plate 15 and the tail plate 16 to produce a manufacturing cost. Can be lowered. Also, in this figure, the shaft hole 37 processed in the base 36 has a circular cross section, but its inner diameter is adjusted so that the embedded root portion 11 can be restrained, and the side end surface of the root portion 11 is It contacts the inner peripheral surface of the shaft hole 37. The shape other than the root portion 11 is exactly the same as in FIG.

  FIG. 5 shows an example of the shape of the frame body 15. The frame body 15 is not limited to a rectangular shape as shown in the drawings so far, and can be more easily shaped to easily cause plastic deformation. The shape example 1 in the figure has a “<” shape with the upper and lower sides of the frame plate 15 bent toward the center. Therefore, when a tensile load is applied between the fixing hole 13 and the pin hole 17, the character “<” is deformed linearly in the initial stage, and then begins to bend in the direction opposite to the initial direction. During this time, the horizontal width of the frame plate 15 is not greatly reduced, and stress concentrates on the corners of the frame 15 and the plastic deformation proceeds efficiently.

  In addition, the shape example 2 has a “<” shape in which the upper, lower, left and right sides of the frame plate 15 are bent toward the center. Therefore, when a tensile load is applied, all of these are deformed linearly, so that more energy can be absorbed. Thus, even when the shape of the frame plate 15 is complicated, the usage method is the same as in FIG. In addition, the connection metal fitting by this invention can be used also when fixing the upper surface of the pillar 41 to the beam 35 like the example of a use condition of this figure.

  FIG. 6 shows a connecting bracket having a shape different from those of the respective drawings so far. In the connection fitting according to the present invention, it is sufficient that a certain window 20 is formed at a predetermined position (between the root portion 11 and the pin hole 17) of the insertion plate 14, and the insertion plate 14 is limited to a frame shape. It is not a thing. Therefore, as shown in this figure, if the pin hole 17 is provided in the vicinity of the end of the connecting metal fitting, the shape of the insertion plate 14 and the arrangement of the windows 20 are free. In the shape example 1 shown in the figure, a plurality of windows 20 are arranged in a letter “C” on the insertion plate 14, and plastic deformation is likely to occur.

  In the second shape example, the center part of both side surfaces of the insertion plate 14 is cut inward, and two stages are stacked vertically, and a horizontally long window 20 is provided inside each stage. Next, in Shape Example 3, a window 20 having a shape in which “H” is laid down is provided inside the insertion plate 14 whose center portions on both sides are constricted. In addition, as for all the connection metal fittings of this figure, the base part 11 is cylindrical shape, and the base part 11 and the insertion board 14 are integrated by welding.

  FIG. 7 shows a connecting bracket having two insertion plates 14. The insertion plate 14 is not limited to one, and can be two in this way. The two insertion plates 14 are arranged in parallel in the same shape and are integrated via a bottom plate 18, and each insertion plate 14 includes a frame plate 15 and a tail plate 16. The side of the frame plate 15 is bent in a “<” shape. In addition, the base portion 11 is integrated with the bottom plate 18 by welding, and the slits 42 of the pillars 41 are processed in two rows. Thus, when the insertion plate 14 is made into two sheets, it is necessary to adjust the thickness, the width | variety, etc. so that moderate plastic deformation may be produced.

11 Root part 12 Fixing hole 14 Insertion plate 15 Frame plate 16 Tail plate 17 Pin hole 18 Bottom plate 20 Window 31 Foundation 32 Anchor bolt 33 Washer 34 Nut 35 Beam (cross member)
36 Foundation (Wood)
37 Shaft hole 38 Round hole 39 Drift pin 41 Column 42 Slit 43 Horizontal hole 45 Drift pin

Claims (3)

A connecting bracket for connecting the column (41) to a cross member such as a base (36) or a beam (35),
A root portion (11) embedded in a shaft hole (37) formed in the cross member;
Insertion plate having a pin hole (17) for inserting a drift pin (45) inserted into a slit (42) formed in an axial direction from an end surface of the column (41) and driven from a side surface of the column (41) (14) and
Consists of
The said insertion plate (14) has the window (20) which cut out the inside in the range from the said pin hole (17) to the said base part (11), The coupling bracket characterized by the above-mentioned.   The insertion plate (14) includes a frame-like frame plate (15) in which the window (20) is formed, and a tail plate (16) protruding from the frame plate (15) and having the pin hole (17). The connecting fitting according to claim 1, comprising: The connecting bracket according to claim 2, wherein a part or all of the sides constituting the frame plate (15) are bent in a "<" shape.

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