JP2010019000A - Hold-down fitting - Google Patents

Abstract

Provided is a hole-down hardware that can be three-dimensionally formed from a single metal plate only by punching and bending, is lightweight, has no manufacturing variations, and does not vary in structural strength.
SOLUTION: A metal plate having a predetermined thickness is formed by punching and bending, a vertically long strip-shaped mounting plate 2 and a pair of parallel ones bent in a right-angle direction continuously to the left and right lower portions of the mounting plate 2. And the other bracket portions 4 and 5 and the horizontal upper edge portion of the one bracket portion 4 so as to abut on the horizontal upper edge portion of the other bracket portion 5 for the bolt mounting integrally formed. A seat plate 7, a plurality of mounting holes 8 formed in the mounting plate 2, and a bolt insertion hole 9 formed in the seat plate 7, are formed to project from the upper edge portion of one bracket portion 4. An engagement hole 10 formed at the abutting end of the seat plate 7 with respect to the one bracket portion 4 is fitted into the engagement protrusion 6.
[Selection] Figure 2

Description

  The present invention relates to a hole-down hardware for reinforcing a joint between a pillar and a base, a trunk, a horizontal member such as a girder. This hole-down hardware can be used for the shaft construction method and the frame wall construction method.

  For the joining of timbers that make up the building frame of a woodworking frame structure, a joint structure represented by a tenon group or the like is generally used as a traditional method of construction. A joining method is adopted in which reinforcing metal fittings are arranged across the mouth part and joined together via nails, bolts, or the like to make the joint part a firm joint structure.

  Among these, as shown in Patent Document 1 below, the hole-down hardware (drawing hardware) was fixed to the side of the pillar or vertical frame, and was erected on the foundation concrete (cloth foundation) and projected on the base. It is connected to the anchor bolt, and is used for the purpose of fastening the column itself to the foundation concrete through the hole-down hardware, and the joint between the horizontal member such as the torso and girder and the column is made stronger. It is also used as a fitting for coupling.

The basic structure of this hole-down hardware is to horizontally project a seat plate through which a bolt is inserted at the bottom of a vertically long strip-shaped mounting plate that is fixed to the side of the column via a wood screw or the like. The lower part is integrated with the mounting plate via a bracket, and is connected to the bolt by screwing a nut onto the projecting end of the bolt from the seat plate.
JP 2001-24115 A

  However, since conventional hole-down hardware is formed by bending a plurality of metal plates and then combining them by welding, it is not only heavy but also cumbersome to manufacture and has variations in quality. There was also a problem in terms of ease of construction. This type of variability leads to structural defects that should not be used in homes.

  Therefore, the present invention solves the above-mentioned problems, and the object is to make a three-dimensional model from a single metal plate only by punching and bending, lightweight, manufacturing variations and It provides hole-down hardware that is easy to construct and does not vary in structural strength.

  In order to achieve the above object, the hole-down hardware 1 of the present invention is formed by punching and bending a metal plate having a predetermined thickness, and is connected to the vertically long strip-shaped mounting plate 2 and the left and right lower portions of the mounting plate 2 in a perpendicular direction. A pair of parallel one and other bracket portions 4 and 5 formed in a bent manner and a horizontal upper edge portion of the other bracket portion 5 so as to abut on a horizontal upper edge portion of the one bracket portion 4 A bolt mounting seat plate 7 integrally formed; a plurality of mounting holes 8 formed in the mounting plate 2; and bolt insertion holes 9 formed in the seat plate 7; The engagement hole 10 formed at the abutting end of the seat plate 7 with respect to one bracket portion 4 is fitted into the engagement protrusion 6 formed to protrude from the upper edge portion of the bracket portion 4. It is a feature.

  In order to manufacture the hole-down hardware 1 according to the present invention, a metal plate having a predetermined thickness is punched and formed to be folded vertically and vertically on the mounting plate 2 and the left and right lower portions of the mounting plate 2 via a valley fold line 2a. A pair of bendable one and other bracket portions 4, 5 and a horizontal upper edge portion of one bracket portion 4 are brought into contact with a horizontal upper edge portion of the other bracket portion 5 via a valley fold line 5a. Product development provided with a bolt mounting seat plate 7 integrated so as to be foldable, a plurality of mounting holes 8 punched in the mounting plate 2, and bolt insertion holes 9 punched in the seat plate 7. The seat plate 7 is formed to project from the front portion of the mounting plate 2 by bending each portion along the valley fold lines 2a and 5a, and the lower portions of the seat plate 7 are bracket portions. Three-dimensional modeling is performed in a state of being supported by 4 and 5.

According to a second aspect of the present invention, the number of the engaging protrusions 6 and the engaging holes 10 may be one, or two front and rear as shown in the embodiment of the figure. Furthermore, two or more can be formed.
By making the height of the engaging projection 6 substantially equal to the thickness of the seat plate 7, the seat plate 7 is prevented from being displaced due to the pulling of the bolt 21, and the strength is improved.

According to a third aspect of the present invention, a pair of reinforcing ribs 3, 3 bent in a right angle direction together with the bracket portions 4, 5 may be provided on both the left and right sides on the upper side of the mounting plate 2.
The pair of reinforcing ribs 3 are bent in a perpendicular direction integrally with one and the other bracket portions 4 and 5 via valley fold lines 2 a formed along the left and right side edges on the upper side of the mounting plate 2. Is done.
The plate portion is reinforced by the reinforcing ribs 3 and 3, and the plate portion is prevented from being broken by pulling the bolt 21.

According to a fourth aspect of the present invention, a seat plate 7a is formed by bending and forming a stacking piece 11 overlapping the outer surface of the one bracket 4 at the abutting end of the seat plate 7 on the one bracket 4. Will be integrated more firmly.
By providing the overlapping piece 11 together with the engagement structure of the engagement protrusion 6 and the engagement hole 10, the seat plate 7 is prevented from being displaced due to the pulling of the bolt 21, and the strength is further improved.

Preferably, the bolt insertion hole 9 formed in the seat plate 7 is a long hole that is long in the front-rear direction of the seat plate 7 in the assembled state.
By setting it as such a long hole, the shift | offset | difference of the protrusion position of the hole down metal 1 fixed to the pillar 32 and the anchor bolt 21 can be adjusted.

As shown in claim 6, a square washer 22 having a bolt insertion hole can be provided on the upper surface of the seat plate 7.
By providing the square washer 22 on the upper surface of the seat plate 7, it is possible to prevent the seat plate 7 from being deformed by the nut 23 that fixes the bolt 21.

According to the present invention, a hole down metal can be formed by punching and bending a single metal plate, so that troublesome welding as in the past can be omitted, and there is no quality variation due to welding. The accuracy of structural strength variation is greatly improved.
Furthermore, compared to conventional hole-down hardware, it is lightweight and the ease of construction is greatly improved. In addition, because it is easier to replace than conventional products, it is suitable for ultra-long-term housing. In addition, high tensile strength can be obtained while being lightweight.

  According to the second or fourth aspect of the invention, in addition to the function and effect of the first aspect, the engagement protrusion and the engagement hole or the overlapping piece prevent the seat plate from being displaced due to the pulling of the bolt, and the bending is also possible. Molding becomes easy, and the seat plate can be reliably butt-fixed on the bracket.

  According to the invention described in claim 3, in addition to the function and effect of claim 1, the reinforcing ribs can improve the strength of the mounting plate and prevent deformation and breakage even with the same plate thickness.

  According to the fifth aspect of the invention, in addition to the effects of the first to fourth aspects, even if there is an insertion position error of the anchor bolt with respect to the seat plate, the error can be allowed by the shape of the long hole.

  According to invention of Claim 6, in addition to the effect of Claims 1 thru | or 5, it can suppress that a seat plate deform | transforms with the nut which fixes an anchor bolt.

  FIG. 1 shows a state in which a thick steel plate is stamped and formed into a developed shape of a hole-down hardware 1. In the figure, the hole-down hardware 1 includes a vertically long strip-shaped mounting plate 2 and a pair of reinforcing ribs 3 that can be bent along the longitudinal direction of the mounting plate 2 via a valley fold line 2a at the upper left and right sides of the mounting plate 2. A pair of one and the other bracket portions 4 and 5 that can be bent via the same valley fold line 2a continuously from the lower portion of the reinforcing rib 3 and a horizontal upper edge portion of the one bracket portion 4 project. The front and rear two engaging projections 6 and the horizontal upper edge portion of the other bracket portion 5 can be bent via a valley fold line 5a and are separated from the opposing reinforcing ribs 3. And a seat plate 7 for mounting bolts.

  A plurality of mounting holes 8 are punched and formed in a staggered manner on the inner side of the upper portion surrounded by the reinforcing rib 3 of the mounting plate 2. A bolt insertion hole 9 having a long hole shape that is long in the front-rear direction in the assembled state is punched and formed at the center of the seat plate 7, and a rectangular shape that engages with the engagement protrusion 6 is formed above the bolt insertion hole 9. The front and rear two engagement holes 10 are formed, and on one side of the seat plate 7 on the upper side of each engagement hole 10, a stacking piece 11 that can be bent by 90 ° via a valley fold line 7a is integrally formed. It is extended. The one and the other bracket portions 4 and 5 are formed in a right triangle shape in which the lower end of the inclined base is in contact with both lower end sides of the mounting plate 2. The engagement protrusion 6 and the engagement hole 10 may be one. A tensile force of 10 to 40 kN can be obtained by changing the number of the fixing holes 20 (Z screws) through which the mounting holes 8 and the mounting holes 8 are inserted.

  After punching and forming a thick steel plate with surface rust treatment such as galvanized or chrome plated in the above developed shape, each part is bent by 90 ° bending along each valley fold line 2a, 5a, 7a By doing so, as shown in FIG. 2, the seat plate 7 protrudes horizontally at the center position in the vertical direction of the mounting plate 2, and the hole-down hardware 1 in which the lower portions on both sides are supported by the bracket portions 4 and 5, is three-dimensionally modeled. Hole down hardware 1 is completed. In the case of using a thick steel plate that has not been subjected to rust prevention treatment on the surface, if a surface rust prevention treatment such as galvanization or chrome plating is performed after three-dimensional modeling, the hole-down hardware 1 is completed.

  In the finished state, the thickness of each part is uniform, and since it is formed only by punching and bending, it is fragile and troublesome processing such as welding, the quality is uniform, and the thickness is The corresponding structural strength can be obtained.

  Further, the strength of the both sides of the mounting plate 2 is increased by the reinforcing ribs 3, and deformation or breakage of the plate surface of the mounting plate 2 due to the tensile force of the wood screw fixture 20 screwed into each mounting hole 8 is prevented. .

  Furthermore, the engagement protrusion 6 is fitted in the engagement hole 10 formed in the seat plate 7, and the overlap piece 11 is overlapped on the outer side of the one bracket portion 4 on the side portion thereof. The joining strength between the seat plate 7 and the one bracket portion 4 can be ensured. In addition, although the number of the engagement protrusion 6 and the engagement hole 10 is two, one may be sufficient. Further, the bolt insertion hole 9 is a long hole along the front-rear direction of the seat plate 7, and copes with a positional deviation with respect to the anchor bolt 21 inserted therethrough.

  FIG. 3 shows a case where the hole-down hardware 1 is applied to a joint structure between a base and a pillar. In the figure, the anchor bolt 21 has a lower J-shaped anchor portion 21 a embedded in a concrete foundation 30 and an upper end protruding on a base 31. The upper end of the bolt 21 protrudes on the seat plate 7 of the hole-down hardware 1 fixed to the side surface of the pillar 32 via a plurality of wood screw fixtures 20, and a nut 23 is screwed to the protruding end via a square flat washer 22. By joining, the base 31 and the pillar 32 are rigidly connected, and the pillar 32 is integrally bonded to the concrete foundation 30 through the base 31.

  The protruding position of the bolt 21 from the base 30 is often slightly shifted in the front-rear direction from the original planned dimension with respect to the mounting position of the base 31, but the bolt insertion hole 9 is a long hole. This misalignment is absorbed so as to be within an allowable error range.

  FIG. 4 (a) shows a case where the hole-down hardware 1 is applied to a joint structure between the column and the case when the column is a pipe column. In the figure, the lower floor pillar 32 and the upper floor pillar 33 are vertically arranged in a straight line through a body insert 34 that is horizontally disposed perpendicular to them. The hole down hardware 1 is fixed to the side surface of the upper floor pillar 33, and the hole down hardware 1 is also fixed in an inverted state on the upper side surface at the position opposite to the lower floor pillar 32. Then, bolts 21 having threaded portions formed at both ends thereof passing through the upper and lower sides of the body insert 34 are inserted, both ends of the bolts 21 are protruded from the respective seat plates 7, and the projecting ends are connected via square flat washers 22. By screwing the nut 23, the upper and lower columns 32, 33 are tightly coupled via the bolt 21.

  FIG.4 (b) has shown the case where the hole down metal fitting 1 is applied to the joint structure of a pillar and a girder. In the figure, a girder 35 is horizontally arranged at an upper portion of a pillar 32 (33) in a direction perpendicular to the girder 35. The hole down hardware 1 is fixed in an inverted state on the upper side surface of the pillar 32, and the lower end of the bolt 21 having a flat rectangular head portion 21b penetrating the upper and lower sides of the girder 35 passes through the seat plate 7 and protrudes to the protruding end thereof. By screwing the nut 23 through the square flat washer 22, the upper end of the column 32 (33) is fastened to the lower portion of the beam 35 via the bolt 21.

  Needless to say, the above-described hole-down hardware 1 can be used in general for auxiliary coupling means in addition to the application examples described above, in order to improve the strength of the joints between the column and the horizontal member.

It is a top view which shows the expansion | deployment shape of the hole down hardware which concerns on this invention. It is a perspective view which shows the completion state of the hole down metal fitting. It is the perspective view which applied the hole down hardware to the joint part of a base and a pillar. (A), (b) is the perspective view which applied the hole down metal fitting to the joint part of a pillar and a trunk difference, and a pillar and a girder.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hole down hardware 2 Mounting plate 2a5a, 7a Valley fold line 3 Reinforcement rib 4,5 Bracket part 6 Engagement protrusion 7 Seat plate 8 Mounting hole 9 Bolt insertion hole 10 Engagement hole 11 Stack piece 20 Fixing tool 21 Bolt 21a Anchor part 21b Head 22 Washer 23 Nut 30 Concrete foundation 31 Base 32, 33 Pillar 34 Body difference 35 Digits

Claims (6)

  A pair of parallel ones formed by punching and bending a metal plate of a predetermined thickness, and bent in a perpendicular direction continuously to the left and right lower portions of the mounting plate (2) and the mounting plate (2). And the other bracket portion (4, 5) and the horizontal upper edge portion of the other bracket portion (5) so as to abut against the horizontal upper edge portion of the one bracket portion (4). A bolt mounting seat plate (7), a plurality of mounting holes (8) formed in the mounting plate (2), and a bolt insertion hole (9) formed in the seat plate (7). And an engaging protrusion (6) formed on the upper edge portion of the one bracket portion (4) to be formed at a butt end with respect to the one bracket portion (4) of the seat plate (7). A hole-down hardware characterized by fitting the engagement hole (10).   2. The hole-down hardware according to claim 1, wherein one or a plurality of the engaging protrusions (6) and the engaging holes (10) are formed.   A pair of reinforcing ribs (3, 3) bent in a right angle direction together with the bracket portions (4, 5) are provided on both left and right sides of the upper side of the mounting plate (2). The hole-down hardware according to claim 1 or 2.   At the abutting end of the seat plate (7) on the one bracket part (4), an overlapping piece (11) that overlaps the outer surface of the one bracket part (4) is formed by bending. The hole-down hardware according to any one of claims 1 to 3, characterized in that:   The hole-down hardware according to any one of claims 1 to 4, wherein the bolt insertion hole (9) formed in the seat plate (7) is a long hole.   The hole-down hardware according to any one of claims 1 to 5, wherein a square washer (22) having a bolt insertion hole is provided on an upper surface of the seat plate (7).

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