JP2004263479A - Anchor bolt and sill fixing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an anchor bolt which eases an impact caused by large vibrations. <P>SOLUTION: A sill fixing structure fixes a sill 21 to a foundation 28 by means of the anchor bolt 1 formed of a screw portion 6 having a screw 7 on one end thereof, a spring portion 10 formed at a raw workpiece portion extending to the screw portion 6, and a fixing portion 13 extending to the screw portion 10 and fixed to the foundation 28. The sill 21 has a hole 22 into which the spring portion 10 of the anchor bolt 1 is inserted. Then the fixing portion 13 of the anchor bolt is embedded in and fixed to the foundation 28, and the sill 21 is mounted on the foundation 28, to thereby allow the spring portion 10 of the anchor bolt to be located in the hole 22. Further a nut 16 is screwed onto the screw portion 6 of the anchor bolt via a seat member 18, and in this manner the sill 21 is fixed to the foundation 28. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a seismic anchor bolt for fixing a foundation of a building to a foundation.
[0002]
[Prior art]
Conventional buildings are fixed by embedding the lower part of the anchor bolt in a concrete foundation, passing the upper part of this anchor bolt through a vertical through hole provided in the base, and connecting the base with a nut via a seat member. It was fastened and fixed with a member. In this base fixing structure, the base and the foundation are directly fixed by anchor bolts, so when an excessive force is applied during an earthquake, the anchor bolts come off from the base and the base of the building loses support, and the building is There was a danger of severe damage.
[0003]
In order to solve this, for example, an anchor bolt embedded in the foundation is passed through a through hole provided in the foundation of the building, a disc-shaped washer for seismic isolation is inserted into the anchor bolt protruding from the foundation, and the There is known a device in which a steel washer is covered from above and the base is fixed by fastening with a nut-shaped member (Patent Documents 1 and 2).
[0004]
Also, a through hole having a diameter larger than the diameter of the anchor bolt is provided on the base, a mat for cushioning is provided between the base and the foundation, and a vibration reducing member having a diameter substantially equal to this through hole is inserted into the through hole of the base. It is known that the upper side of an anchor bolt fixed to a foundation is made to penetrate these mats and vibration reducing members, and the base is fixed by a nut-like member via a seat member (Patent Document 3, Patent Document 4).
[0005]
[Patent Document 1]
JP-A-2002-30742 (page 2, FIG. 1)
[Patent Document 2]
JP-A-2002-30743 (pages 2 to 3, FIG. 1)
[Patent Document 3]
JP-A-9-296541 (page 3, FIG. 3)
[Patent Document 4]
JP-A-9-184217 (pages 7 to 8, FIG. 7)
[0006]
[Problems to be solved by the invention]
However, the above-mentioned conventional base fixing structure fixes the base to the base with an intervening seismic material, cushioning material or seismic isolation material. However, if the magnitude of the earthquake is large and its amplitude is very large and severe, there is a limit in absorbing this.
[0007]
An object of the present invention is to be able to alleviate severe shaking.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the present invention provides a threaded portion in which a thread is formed on one end side of a rod-shaped material, a spring portion formed in a material portion extending to the threaded portion, And a fixing portion fixed to the base member.
[0009]
In this way, when the anchor bolt fixing portion receives a strong vertical swing due to, for example, an earthquake or the like, the spring portion connected to the fixing portion has a small force against the strong shaking transmitted from the fixing portion. It expands and contracts according to its size. When the force is large, the spring of the spring portion expands in accordance with the force and is greatly deformed. When the force is lost, it returns to its original length due to elasticity. In this way, even if the fixing portion is violently shaken in the vertical direction, the deformation corresponding to the shaking is performed, so that the shaking is reduced, and the screw portion is not subjected to the strong shaking of the fixing portion. In addition, since the anchor bolt itself has a spring portion, it is not necessary to use an elastic member corresponding to another special load or impact, so that the shape of the anchor bolt is simplified.
[0010]
A base fixing structure for fixing a base to a foundation by using the anchor bolt, wherein at least one of the base and the base has a hole or a concave portion into which a spring portion of the anchor bolt is inserted, and a fixing part of the anchor bolt. By embedding and fixing the base in the hole and placing the base on the base, the spring part of the anchor bolt is located in the hole or the concave part, and the nut-like member is screwed into the screw part of the anchor bolt via the seat member, and the base is screwed. It is characterized by being fixed to the foundation.
[0011]
With this configuration, when the foundation vibrates in the vertical direction due to an earthquake or the like, the fixing portion of the anchor bolt also vibrates at the same time as the foundation. When the fixing portion of the anchor bolt vibrates up and down violently, the spring portion expands and contracts in response to the vibration, so that the vigorous vibration is not transmitted to the base and the vibration is reduced.
[0012]
Further, when a lateral vibration (horizontal direction) is applied due to an earthquake or the like, the foundation first rolls due to the roll. However, the spring portion of the anchor bolt is flexible because its outer diameter is larger than the diameter of the rod-shaped material. Furthermore, since there is a gap between the outer surface of the spring portion and the inner surface of the hole or recess of the base or the foundation, even if the foundation is rolled and displaced, the anchor bolts may be attached to the inner surface of the hole or recess of the foundation or the foundation. It is difficult to hit and the impact is reduced.
[0013]
Next, each requirement constituting the present invention will be described in more detail. The anchor bolt is used when fixing a foundation of a building, a house, or the like to a foundation. The material of the anchor bolt may be tough carbon steel for the base bolt, but in particular, the spring portion is preferably made of a material suitable for the spring, for example, spring steel. For this reason, the screw part, the spring part, and the fixed part may be made of different materials, and the two materials may be joined by welding or the like. The lower portion of the anchor bolt may be bent into an L shape, a U shape, or another shape.
[0014]
The spring portion is formed by shaping the rod-shaped material into a shape having a spring effect such as a spiral shape, a spiral shape, or a bent shape. The cross section of the rod-shaped material is circular, rectangular, or another shape. The spring diameter of the spring portion is set to an appropriate diameter according to the diameter of the rod-shaped material to be used. The shape of the hole or the concave portion formed on the base or the foundation is not particularly limited, but generally, the space shape of the hole or the concave portion is preferably cylindrical. Further, the inner diameter is made larger than the outer diameter of the spring portion inserted therein. By making the outer diameter larger than the outer diameter of the spring portion, it is possible to reduce the roll of the vibration caused by the earthquake or the like.
[0015]
Note that a pad made of an elastic material may be interposed between the base and the foundation. The pad shrinks when the foundation is pushed upward by vibration such as an earthquake, absorbing the impact and mitigating the effect on the base. The base is made of wood, steel frame, etc. The foundation is made of concrete or a reinforcing bar or a steel concrete in which a reinforcing member or a steel frame as a reinforcing material is embedded in the concrete.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of an anchor bolt and a base fixing structure according to the present invention will be described in detail with reference to the drawings. 1 to 9, the same or equivalent parts are denoted by the same reference numerals.
[0017]
1 is a front sectional view showing a first embodiment of a base fixing structure according to the present invention, FIG. 2 is a side sectional view of FIG. 1, and FIG. 3 is a plan view of FIG. The anchor bolt 1 used in the base fixing structure of the first embodiment is used when fixing a base 21 of a house to a foundation 28. That is, the anchor bolt 1 includes a threaded portion 6 in which a screw 7 is formed on one end 4 side of the rod-shaped material 3, a spring portion 10 formed in a material portion extending to the threaded portion 6, and an extension in the spring portion 10. And a fixing portion 13 fixed to the foundation 28.
[0018]
The spring portion 10 is formed by spirally winding a rod-shaped material. The cross section of the rod-shaped material is circular in the first embodiment, but is not limited to this. The spring diameter of the spring portion 10 is set to an appropriate diameter according to the diameter d0 of the rod-shaped material to be used. The diameter d2 of the recess formed in the base 21 is made larger than the outer diameter d1 of the spring portion inserted therein.
[0019]
The material of the anchor bolt 1 is carbon steel for the foundation bolt. In particular, the portion above the portion indicated by the dotted line 20, that is, the spring portion 10 and the screw portion is made of a material suitable for the spring and the screw, and the portion below the dotted line 20 May be carbon steel for foundation bolts. Joining is performed at a portion indicated by a dotted line 20 by joining means such as welding. The lower portion of the anchor bolt fixing portion 13 is bent into an L-shape.
[0020]
In the base fixing structure of the first embodiment, the base 21 is fixed to the foundation 28 using the anchor bolt 1. In this case, the screw portion 6 of the anchor bolt projects from the upper surface 25 of the base and is exposed. The base 21 has a hole 22 therethrough, into which the spring portion 10 of the anchor bolt is inserted. The shape of the hole 22 is circular in cross section.
[0021]
As shown in FIG. 2, the shape of the seat member 18 is such that ribs 18b having a height h are provided at both ends of the plate portion 18a. The length L and width B of the seat member 18 are larger than the diameter d2 of the hole 22. By doing so, the force transmitted from the anchor bolt 1 to the base 21 via the nut 16 and the seat member 18 can be dispersed. The ribs 18b increase the strength and rigidity of the seat member 18. An elastic pad 32 is interposed between the base 21 and the foundation 28.
[0022]
In order to fix the base 21 to the foundation 28 using the anchor bolt 1, first, the fixing portion 13 of the anchor bolt is embedded and fixed in the foundation 28. At this time, the spring portion 10 of the anchor bolt is exposed from the upper surface 30 of the foundation 28. In this way, the base 21 is placed on the anchor bolt 1 fixed to the foundation 28 and the base 21 is placed on the foundation 28. At this time, the spring portion 10 of the anchor bolt is located in the hole 22 formed in the base, The screw part 6 of the anchor bolt is set in a state protruding from the base. Next, the base 21 is fixed to the foundation 28 by screwing and tightening a nut (nut-like member) into the screw portion 6 of the anchor bolt via the seat member 18.
[0023]
The operation of the anchor bolt 1 and the base fixing structure of the first embodiment having the above structure will be described. In FIG. 1, when the foundation 28 is suddenly lowered by vibration such as an earthquake, the anchor bolt fixing portion 13 is also lowered at the same time. Since the fixing portion 13 of the anchor bolt and the spring portion 10 are connected, the spring portion 10 of the anchor bolt is stretched according to the force (or load) when the fixing portion 13 is suddenly lowered. When the force is large, the spring of the spring portion 10 is greatly extended and deformed. When the force is lost, it returns to its original length due to elasticity. As a result, the sudden force applied from the foundation is reduced and transmitted to the base. Further, the anchor bolt 1 itself has the spring portion 10 formed thereon, and it is not necessary to use an elastic member corresponding to another special load or impact, so that the shape of the anchor bolt 1 itself is simplified.
[0024]
When a vibration in the horizontal direction (horizontal direction) due to an earthquake or the like is applied, first, the base 28 sways due to the sway. However, the spring portion 10 of the anchor bolt is flexible since its outer diameter d1 is larger than the diameter d0 of the rod-shaped material. Further, since a gap is formed between the outer surface of the spring portion 10 and the inner surface 22a of the hole of the base 21, even if the base 28 is displaced by rolling, the outer surface of the spring portion 10 is The degree of contact with the inner surface 22a is reduced, and severe shaking of the foundation is alleviated and transmitted to the base. As described above, by making the inner diameter d2 of the hole 22 of the base larger than the outer diameter d1 of the spring portion, it is possible to reduce the impact of the roll of the vibration due to the earthquake or the like.
[0025]
Further, the seat member 18 provided with the ribs 18b can increase the strength and rigidity, and can disperse the force transmitted from the anchor bolt 1 to the base 21 via the nut 16 and the seat member 18. Further, by providing the pad 32, the pad 32 contracts when the foundation 28 is pushed upward due to vibration such as an earthquake, and absorbs the vibration to reduce the impact on the base 21.
[0026]
FIG. 4 is a front sectional view showing a second embodiment of the base fixing structure according to the present invention, and FIG. 5 is a side sectional view of FIG. In the base fixing structure according to the second embodiment, the screw part 6 and the spring part 10 of the anchor bolt are inserted into the two-step hole 22 provided in the base 21, and the tip of the anchor bolt 1 is moved from the upper surface 25 of the base. It is formed so as not to protrude. By doing so, the heads of the bolts do not protrude above the base 21, so that there is no interference even if other members are arranged. For this reason, the degree of freedom of connection between the base and other members such as pillars, braces, parts, and the like is increased. In the second embodiment shown in FIGS. 4 and 5, other structures and operations are the same as those in the first embodiment shown in FIGS.
[0027]
FIG. 6 is a side sectional view showing a third embodiment of the base fixing structure according to the present invention. In the anchor bolt 1 according to the third embodiment, a material portion having a length substantially corresponding to the height H of the base is provided between the screw portion 6 and the spring portion 10, and the base member 21 has a rod-shaped material ( A through hole 27 into which the diameter d0) is inserted is provided. Further, the base 28 is provided with a concave portion 29 which is opened on the upper surface 30 thereof. In this way, the strength of the base 21 is maintained because the base 21 has no hole into which the spring portion 10 is inserted. Further, a normal washer can be used as the seat member 18 to be used. In the third embodiment shown in FIG. 6, other structures and operations are the same as those in the first embodiment shown in FIGS.
[0028]
FIG. 7 is a side sectional view showing a fourth embodiment of the base fixing structure according to the present invention. In the anchor bolt 1 according to the fourth embodiment, a through hole 27 shorter than the length corresponding to the height H of the base is provided between the screw portion 6 and the spring portion 10. Further, a concave portion 23 which is open on the lower surface 26 of the base is provided. Further, the base 28 is provided with a concave portion 29 which is opened on the upper surface 30 thereof.
[0029]
In the base fixing structure thus formed, the spring portion 10 of the anchor bolt is inserted across the concave portion 23 provided on the base and the concave portion 29 provided on the foundation, and the upper part of the spring portion 10 of the anchor bolt is It is inserted into a through hole 27 provided in the base. The base 21 is provided with the concave portion 23 for inserting the spring portion 10 only on the lower surface 26 side of the base, and only the small-diameter through hole 27 is provided on the upper surface 25 side of the base, so that the strength of the base 21 is maintained. At the same time, the length of the anchor bolt 1 embedded in the foundation 28 can be reduced, and the height of the foundation 28 can be reduced. In the fourth embodiment shown in FIG. 7, other structures and operations are the same as those in the first embodiment shown in FIGS.
[0030]
FIG. 8 is a front sectional view showing a fifth embodiment of the base fixing structure according to the present invention. FIG. 9 is a perspective view of the cylinder shown in FIG. 8 as viewed from below. In the base fixing structure according to the fifth embodiment, a cylindrical body 34 as shown in FIG. 9 is inserted into a hole 22 provided in the base. The cylindrical body 34 has a cylindrical portion 36 and a seat plate portion 38 at one end (upper end) of the cylindrical portion 36. It is preferable that the outer shape of the cylindrical portion 36 substantially matches the hole 22 of the base, and the outer wall surface of the cylindrical portion 36 be formed so as to contact the inner wall surface of the hole 22 of the base. At the center of the seat plate portion 38, a hole 40 through which the screw portion 6 of the anchor bolt passes is provided. The material of the cylinder is not particularly limited as long as it has high mechanical strength, but it is preferable to use a hard synthetic resin, stainless steel, steel, an aluminum alloy, another metal, or the like.
[0031]
In the base fixing structure according to the fifth embodiment, since the cylindrical body 34 is inserted into the hole 22 of the base and provided, horizontal vibration (horizontal direction) due to an earthquake or the like is applied to the anchor bolt 1 and rolls. The spring portion 10 of the anchor bolt contacts the inner wall surface of the cylindrical body 34 but does not directly contact the inner wall surface of the hole 22 of the base. Since the spring portion 10 does not directly hit the inner wall surface of the base 22, the inner wall surface of the base 22 is less likely to be damaged or damaged. In the fifth embodiment shown in FIGS. 8 and 9, other structures and operations are the same as those in the first embodiment shown in FIGS.
[0032]
【The invention's effect】
According to the present invention, since the anchor bolt itself is provided with the spring portion, it is possible to alleviate the severe shaking on the base.
[Brief description of the drawings]
FIG. 1 is a front sectional view showing a first embodiment of a base fixing structure according to the present invention.
FIG. 2 is a side sectional view of FIG.
FIG. 3 is a plan view of FIG. 1;
FIG. 4 is a front sectional view showing a second embodiment of the base fixing structure according to the present invention.
FIG. 5 is a side sectional view of FIG. 4;
FIG. 6 is a side sectional view showing a third embodiment of the base fixing structure according to the present invention.
FIG. 7 is a side sectional view showing a fourth embodiment of the base fixing structure according to the present invention.
FIG. 8 is a front sectional view showing a fifth embodiment of the base fixing structure according to the present invention.
FIG. 9 is a perspective view of the cylinder shown in FIG. 8 as viewed from below.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Anchor bolt 3 Rod-shaped member 4 One end 6 Screw part 7 Screw 10 Spring part 13 Fixed part 16 Nut (nut-shaped member)
18 Washer (seat member)
21 Base 22 Hole 23 Recess 28 Foundation 29 Recess

Claims (2)

A threaded portion having a thread formed on one end of the rod-shaped material, a spring portion formed on the material portion extending to the threaded portion, and a fixing portion extending to the spring portion and fixed to a foundation. Become an anchor bolt. A base fixing structure for fixing a base to a foundation using the anchor bolt according to claim 1, wherein at least one of the base and the base has a hole or a recess into which a spring portion of the anchor bolt is inserted, The anchor portion of the anchor bolt is embedded in the foundation and fixed, and the base is placed on the foundation to position the spring portion of the anchor bolt in the hole or the concave portion. A base fixing structure in which a nut-like member is screwed through a seat member and the base is fixed to the foundation.

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