JP2025027902A - Earthquake-resistant unit - Google Patents

Abstract

An earthquake-resistant unit capable of exerting sufficient strength against a tensile force acting on a brace is provided.
[Solution] The structure comprises a fixed hardware 2 fixed to a corner A1 of a square structural frame A surrounded by horizontal members 100 and vertical members 200, a steel rod-shaped diagonal brace 3 connecting the opposing corners A1, and a steel connecting hardware 4 which holds the end of the diagonal brace 3 and is connected to the fixed hardware 2. A locking portion 5 is provided at the end of the diagonal brace 3. The connecting hardware 4 is provided with a cylindrical insertion tubular portion 43 through which the end side of the diagonal brace 3 is inserted and to which the locking portion 5 is locked, and a connecting main body portion 40 which is connected to the fixed hardware 2 and to which the insertion tubular portion 43 is fixed. The connecting main body portion 40 is provided with a retaining plate 42 on which the insertion tubular portion 43 is positioned. The retaining plate 42 is provided with an opening 421 into which a circumferential portion of the insertion tubular portion 43 fits, and four welded portions 44 are provided at which the insertion tubular portion 43 and the retaining plate 42 are welded.
[Selected figure] Figure 2

Description

This invention relates to an earthquake-resistant unit that can increase the earthquake resistance of buildings.

2. Description of the Related Art Structures using braces have been proposed as earthquake-resistant units capable of increasing the earthquake resistance of buildings.
Such an earthquake-resistant unit has fasteners that are fixed to the corners of a rectangular opening surrounded by horizontal and vertical members, rod-shaped diagonal braces that connect the opposing corners of the opening, and steel connecting hardware that holds the ends of the diagonal braces and is connected to the fasteners.

When a large force is applied due to an earthquake or the like, a building equipped with an earthquake-resistant unit as described above must resist a force that tends to deform the opening into a parallelogram shape. At that time, a tensile force is applied to the diagonal braces, pulling the connecting metal fittings and the fixing devices, but there is a problem that the connecting metal fittings cannot withstand the tensile force and fall off the fixing devices, or the connecting metal fittings and the fixing devices fall off from the corners of the opening. Therefore, Patent Document 1 discloses an earthquake-resistant unit in which the diagonal braces are unlikely to come off the connecting metal fittings and the fixing devices even when a tensile force is applied to the diagonal braces.

The earthquake-resistant unit of Patent Document 1 has a connecting metal fitting fixed to a fixing device, and holds the wooden diagonal brace with a clamping portion that clamps and supports the end of the diagonal brace in a direction perpendicular to the longitudinal direction of the diagonal brace, and a fastening fixture that fixes the diagonal brace to the clamping portion.
However, since the earthquake-resistant unit of Patent Document 1 has diagonal braces made of wood, the tensile strength of the diagonal braces themselves is not high and there is a risk that the diagonal braces will be damaged by a large tensile force, and the earthquake-resistant strength of the entire earthquake-resistant unit cannot be sufficiently improved.

JP 2014-152566 A

The purpose of this invention is to provide an earthquake-resistant unit that can exhibit sufficient strength against the tensile force acting on the brace.

This invention comprises a fixture fixed to the corner of a rectangular opening surrounded by horizontal and vertical members, a steel rod-shaped diagonal brace connecting the opposing corners of the opening, and a steel connecting hardware that holds the end of the diagonal brace and is connected to the fixture, and a locking part is provided at the end of the diagonal brace. The connecting hardware is provided with a cylindrical insertion tube part through which the end side of the diagonal brace is inserted and through which the locking part is locked by the action of a tensile force on the diagonal brace, and is pivotally connected to the fixture and through which the insertion tube part is fixed. The connecting body is provided with a positioning section for positioning the insertion tubular part along the longitudinal direction of the brace, the connecting body is provided with a positioning section for positioning the insertion tubular part along the longitudinal direction of the brace, the positioning section is provided with an insertion opening that penetrates in a thickness direction intersecting with the longitudinal direction and into which a circumferential part of the insertion tubular part is fitted, and the insertion tubular part that fits into the insertion opening is provided with welds that weld the insertion tubular part and the positioning section along the longitudinal direction at four locations on both sides of the positioning section in the thickness direction and on both sides in the width direction intersecting with the longitudinal direction and the thickness direction.

The welds are not limited to those extending along the longitudinal direction, but may be in a direction intersecting the longitudinal direction at a predetermined angle, where the predetermined angle is within 45° with respect to the longitudinal direction.
Further, the welded portions are not limited to those provided continuously along the longitudinal direction, but may be provided, for example, in the form of dashed lines at predetermined intervals along the longitudinal direction.

There are no particular limitations on the structure of the locking portion as long as it can lock the insertion tubular portion and the diagonal brace together by the action of a tensile force on the diagonal brace when the diagonal brace is inserted into the insertion tubular portion.
According to the present invention, it is possible to configure an earthquake-resistant unit that can exhibit sufficient strength against the tensile force acting on the diagonal brace.

In more detail, the diagonal braces that connect the opposing corners of the rectangular opening surrounded by the horizontal and vertical members are made of steel rods. The diagonal braces are attached to the opening via fixtures that are fixed to the corners and connecting hardware that connects the fixtures to the diagonal braces.

When a large horizontal force is applied due to an earthquake or the like, the opening equipped with the brace will resist the force that tends to deform the opening into a parallelogram. At that time, a tensile force that pulls the brace acts on the brace via the fixing device and the connecting metal fittings.

The steel rod-shaped braces do not yield even when a large tensile force is applied and can withstand the tensile force, but there is a risk that the effectiveness of the braces will not be fully realized if the connecting metal that holds the braces is damaged because it cannot withstand the tensile force.

In response to the above concerns, in the present invention, when the above-mentioned tensile force acts on the diagonal brace, the locking portion provided at the end of the diagonal brace and the insertion tubular portion provided on the connecting hardware, through which the diagonal brace can be inserted, are engaged. This allows the tensile force to be transmitted from the locking portion to the insertion tubular portion. In addition, since the welding portions that weld and fix the insertion tubular portion to the arrangement portion are provided in four places, the insertion tubular portion can be firmly fixed to the arrangement portion. Therefore, it is possible to prevent the connecting hardware from being damaged by the tensile force acting on the inserted diagonal brace. Therefore, it is possible to configure an earthquake-resistant unit that can exert sufficient strength against the tensile force acting on the diagonal brace.

As an aspect of this invention, the insertion tubular portion that fits into the insertion opening may be positioned so that the end face on the tensile direction side where the tensile force input from the diagonal brace acts abuts the edge that forms the insertion opening.
According to this invention, the end face of the insertion tube part and the edge of the insertion opening come into contact with each other, so that the tensile force acting on the diagonal brace can be transmitted to the connecting hardware having the insertion opening. Therefore, the tensile force acting on the welded part can be reduced, and the insertion tube part can be fixed to the arrangement part more firmly in addition to the fixation by the welded part. Therefore, the connecting hardware can be more reliably prevented from being damaged by the tensile force acting on the inserted diagonal brace.

As a further aspect of the present invention, the arrangement portion may be formed in a plate shape having a thickness equal to or greater than the thickness of the insertion cylindrical portion.
According to this invention, a sufficient contact area can be secured at the contact point between the end face of the insertion tube portion and the end edge of the insertion opening. Therefore, the tensile force acting on the brace can be reliably transmitted by the connecting metal member having the insertion opening, and the tensile force acting on the welded portion can be further reduced. Therefore, it is possible to more reliably prevent the insertion tube portion from falling off the arrangement portion.

As a further aspect of the present invention, the insertion tube portion may be disposed so that a fitting depth into the fitting opening is equal to a thickness of the disposition portion.
According to this invention, the abutment length in the width direction of the insertion tubular portion fitting into the fitting opening can be secured at the abutment point between the end face of the insertion tubular portion and the edge of the fitting opening, so that the fixing strength of the insertion tubular portion to the arrangement portion can be further improved. Furthermore, since the insertion tubular portion does not protrude from the arrangement portion in the width direction, the insertion tubular portion can be prevented from interfering with other members and being damaged.

As a further aspect of the present invention, the welded portion may be formed over the entire length of the insertion tube portion in the longitudinal direction.
According to the present invention, a sufficient welding length for welding the insertion tube part to the arrangement part can be ensured, so that the insertion tube part can be fixed to the arrangement part more firmly, thereby forming an earthquake-resistant unit with higher fixing strength.

As another aspect of the present invention, the diagonal brace may be made of ultra-high tensile steel or high tensile steel having a higher tensile strength than general structural rolled steel.
This invention can improve the tensile strength of the brace itself, and therefore, by combining the brace made of ultra-high tensile steel or high tensile steel, which has high tensile strength, with the steel connecting hardware, the strength of the entire seismic unit can be improved.

In another embodiment of the invention, the fixing device has a horizontal facing portion and a vertical facing portion that face the inner surfaces of the horizontal member and the vertical member that form the corner portion, respectively, and in the vertical facing portion, fixing members that are fixed to the vertical member are provided in a first group arranged at a predetermined interval in the width direction and a second group arranged at an interval narrower than the first group in multiple rows, and the first group and the second group may be arranged alternately along the longitudinal direction.

This invention allows the fixing device to be firmly fixed to the horizontal and vertical members. Therefore, the fixing device can be fixed with sufficient fixing strength against the strength of the brace made of ultra-high tensile steel or high tensile steel. Therefore, the strength of the entire seismic unit can be further improved.

This invention makes it possible to provide an earthquake-resistant unit that can exhibit sufficient strength against the tensile forces acting on the braces.

Front view of structural frame reinforced with seismic units. FIG. FIG. FIG. An explanatory diagram of connecting hardware. An explanatory diagram of connecting hardware. An enlarged cross-sectional view of a connecting metal piece passing through the center of a brace in a seismic unit.

An embodiment of the present invention will now be described with reference to the drawings.
Fig. 1 shows a front view of a structural frame A reinforced with seismic units 1, and Fig. 2 shows an enlarged perspective view of a main part of the seismic unit 1. Fig. 3 shows an exploded perspective view of the seismic unit 1, and Fig. 4 shows an explanatory diagram of the fixing hardware 2. Figs. 5 and 6 show explanatory diagrams of the connecting hardware 4, and Fig. 7 shows an enlarged cross-sectional view of the connecting hardware 4 passing through the center of the brace 3 in the seismic unit 1.

Figures 4 to 7 will be described in detail. Figure 4(a) shows a schematic perspective view of the fixed metal 2 as viewed from the upper side Hu and the front side Da, Figure 4(b) shows a schematic plan view of the fixed metal 2, Figure 4(c) shows a schematic rear view of the fixed metal 2, and Figure 4(d) shows a schematic side view of the fixed metal 2. Figure 5(a) shows a schematic perspective view of the connecting metal 4 as viewed from the upper side Hu and the front side Da, Figure 5(b) shows a schematic perspective view of the connecting metal 4 as viewed from the lower side Hd and the front side Da, and Figure 5(c) shows an enlarged bottom view of the connecting metal 4. Figure 6(a) shows a cross-sectional view taken along the line A-A in Figure 5(c), and Figure 6(b) shows an enlarged view of part a in Figure 6(a). Figure 7 shows an enlarged cross-sectional view of the state in which a tensile force F1 acts on the brace 3 held by the connecting metal 4. Note that Figure 7 is a cross-sectional view corresponding to Figure 6(a).

Here, the direction along the horizontal member 100 in FIG. 1 is the width direction W, and the direction perpendicular to the width direction W and along the vertical member 200 is the up-down direction H. The direction perpendicular to the width direction W and the up-down direction H is the depth direction D. The left side along the depth direction D is the near side Da, and the right side is the far side Db. One side along the up-down direction H is the upper side Hu, and the lower side is the lower side Hd. The left side along the width direction W is the left side Wl, and the right side is the right side Wr.

As shown in Figures 1 and 2, the earthquake-resistant unit 1 is fixed to a rectangular structural frame A surrounded by horizontal members 100 such as foundations or beams, and vertical members 200 such as through columns or pipe columns, reinforcing the structural frame A against horizontal forces input by earthquakes, etc.

As shown in Figures 2 and 3, the earthquake-resistant unit 1 described above is composed of a fixed metal fitting 2 fixed to the corner portion A1 of the structural frame A, a steel rod-shaped diagonal brace 3 connecting the opposing corner portions A1 of the structural frame A, and a steel connecting metal fitting 4 that holds the end of the diagonal brace 3 and connects to the fixed metal fitting 2. In this embodiment, the extension direction of the diagonal brace 3 is the longitudinal direction L.

As shown in FIG. 4( a ), the fixing hardware 2 is integrally formed of a pair of support plates 20 and a facing portion 21 that connects the support plates 20 along the depth direction D.
As shown in Figures 4(a) and 4(d), the support plate 20 is a plate material extending in the width direction W and the up-down direction H. The support plate 20 is formed in a substantially rectangular shape when viewed from the depth direction D, and the end face of the upper side Hu is inclined downwardly Hd as it approaches the right side Wr. The fixing hardware 2 shown in Figure 4(a) is oriented to be attached to the lower side Hd and the left side Wl corners A1 of the four corners A1 of the structural frame A, and when the fixing hardware 2 is attached to the other corners A1, it is attached in an appropriate orientation.

The support plate 20 also has a first cutout 201 on the upper side Hu and right side Wr, which is cut out in a pentagonal shape, and a second cutout 202, which is cut out in a rectangular shape from the end of the right side Wr of the first cutout 201 and the end of the lower side Hd to a certain portion in the vertical direction H.

Furthermore, a circular support plate through hole 203 having a predetermined diameter is provided at a portion spaced a predetermined distance in the vertical direction H from the first notch 201. Two support plates 20 configured in this manner are provided at a predetermined distance in the depth direction D. Specifically, the support plates 20 are provided at a distance approximately equal to the length of the horizontal member 100 and the vertical member 200 in the depth direction D, as shown in FIG. 2.

The facing portion 21 is a plate material that connects a pair of support plates 20 in the depth direction D, and is formed in an L-shape when viewed from the depth direction D by a horizontal facing portion 211 that connects the lower sides Hd of the support plates 20 and a vertical facing portion 221 that connects the left sides Wl of the support plates 20.

As shown in Figs. 4(a) and 4(c), the horizontal facing portion 211 is a plate material that has a thickness that is approximately equal to that of the support plate 20 and is approximately rectangular when viewed from the longitudinal direction L. The length of the horizontal facing portion 211 in the depth direction D is approximately equal to the length of the horizontal member 100 in the depth direction D, and the length of the horizontal facing portion 211 in the width direction W is approximately equal to the length of the support plate 20 in the width direction W.

A central through-hole 212 and side through-holes 213, which are circular through-holes penetrating in the up-down direction H, are provided in the central portion and both end portions in the depth direction D of the horizontal facing portion 211.
Two central through holes 212 are provided at a predetermined interval in the width direction W at the center of the depth direction D of the horizontal facing portion 211. Of the two central through holes 212 provided in the width direction W, the one on the left side Wl is referred to as a first central through hole 212a, and the one on the right side Wr is referred to as a second central through hole 212b. The first central through hole 212a is formed to have a larger diameter than the second central through hole 212b.

The side through holes 213 are spaced apart from the central through hole 212 at a predetermined distance toward both ends in the depth direction D, and two are provided along the width direction W at a distance greater than the distance between the two central through holes 212. In other words, the side through holes 213 are provided in a total of four locations in the horizontal facing portion 211. The side through holes 213 are formed with a diameter that is approximately the same as that of the second central through hole 212b.

As shown in Figs. 4(a) and 4(d), the vertical facing portion 221 is a plate material that is approximately rectangular when viewed from the width direction W and has a thickness that is approximately the same as that of the support plate 20 and the horizontal facing portion 211. The length of the vertical facing portion 221 in the depth direction D is approximately the same as that of the horizontal facing portion 211, and the length of the vertical facing portion 221 in the up-down direction H is approximately the same as that of the support plate 20.

Further, the vertical facing portion 221 is provided with a plurality of circular vertical through holes 222 penetrating therethrough in the width direction W.
The vertical through holes 222 are composed of a pair of first through hole groups 222a provided at a predetermined interval in the depth direction D, and a pair of second through hole groups 222b provided at a narrower interval in the depth direction D than the first through hole group 222a. The first through hole group 222a and the second through hole group 222b are formed with approximately the same diameter, and two of each are provided alternately in the up-down direction H. The arrangement of the vertical through holes 222 is not limited to this, and the number and arrangement can be appropriately set to ensure a predetermined fixing strength to the vertical member 200. In addition, when the fixing hardware 2 is arranged perpendicular to the vertical member 200, the heights of the first through hole group 222a and the second through hole group 222b can be appropriately shifted to avoid interference between the fastening fixtures inserted therethrough.

As shown in Figures 1 and 3, the diagonal brace 3 is a steel bar having a predetermined length in the vertical direction H and a predetermined diameter. Specifically, the diagonal brace 3 is made of ultra-high tensile steel or high tensile steel, which has a higher tensile strength than general structural rolled steel. The diagonal brace 3 has a thread 31 formed on both ends of a predetermined length, and a nut 32 and washer 33 of a predetermined diameter can be attached.

As shown in FIG. 5, the connecting hardware 4 is integrally formed with a connecting body 40 that is connected to the support plate 20 of the fixed hardware 2, and a cylindrical insertion part 43 that is fixed to the connecting body 40 and through which the brace 3 is inserted and held.

The connecting body 40 is composed of a pair of connecting plates 41 and a retaining plate 42 that connects the pair of connecting plates 41. The retaining plate 42 is also provided with a welding portion 44 that welds and fixes the insertion tube portion 43.

As shown in FIG. 5, the connecting plate 41 is a plate material having a predetermined thickness in the depth direction D. The connecting plate 41 is formed in a substantially rectangular shape when viewed from the depth direction D, has a predetermined length along the width direction W, and has a length along the longitudinal direction L that is longer than the length along the width direction W. In addition, the end of the upper side Hu of the connecting plate 41 is inclined toward the lower side Hd as it moves toward the left side Wl. The lower side Hd of the connecting plate 41 is provided with a circular connecting plate through hole 411 having approximately the same diameter as the support plate through hole 203 provided in the support plate 20 of the fixing metal 2. Two connecting plates 41 configured in this manner are provided at an interval shorter than the length of the depth direction D of the fixing metal 2. Specifically, the two connecting plates 41 are provided at an interval such that the outer main surfaces in the depth direction D of the two connecting plates 41 are approximately the same as the inner main surfaces in the depth direction D of the two support plates 20.

The retaining plate 42 is a plate material that connects the right side Wr of the pair of connecting plates 41, and the side Hu above the middle part of the connecting plate 41 in the up-down direction H, in the depth direction D, which is a direction perpendicular to the main surface of the connecting plate 41. In other words, the connecting body 40, which is composed of the pair of connecting plates 41 and the retaining plate 42 that connects the pair of connecting plates 41, is formed to be approximately U-shaped when viewed from the longitudinal direction L. The thickness of the retaining plate 42 is formed to be approximately the same as the thickness of the pair of connecting plates 41.

The holding plate 42 has an opening 421 at the center in the depth direction D, penetrating a portion of the holding plate 42 in the thickness direction. In addition, a pair of extension pieces 422 are provided at the end of the lower side Hd of the holding plate 42, and at both ends in the depth direction D, extending in the up-down direction H in a roughly right-angled triangular shape.

The opening 421 is a notch cut out in a generally rectangular shape at the center of the depth direction D of the retaining plate 42 from the end of the lower side Hd of the retaining plate 42, with a length shorter than the length of the retaining plate 42 in the up-down direction H. The length of the opening 421 in the width direction W is shorter than the length of the insertion tube portion 43 in the width direction W, which will be described later. The opening 421 is formed by a pair of vertical edge portions 421a along the up-down direction H and a horizontal edge portion 421b along the width direction W.

The insertion tubular portion 43 is a tubular body having a diameter along the radial direction along the depth direction D and width direction W that is approximately the same as the diameter of the nut 32 and washer 33 attached to the end of the diagonal brace 3. The length of the insertion tubular portion 43 in the vertical direction H is approximately the same as the length of the opening 421 in the vertical direction H. The insertion tubular portion 43 also has a diagonal brace through hole 431 that is a through hole along the vertical direction H and has a diameter that allows the diagonal brace 3 to be inserted therein. The length from the outer peripheral surface of the insertion tubular portion 43 to the diagonal brace through hole 431, i.e., the thickness of the insertion tubular portion 43, is formed to be approximately the same as the thickness of the retaining plate 42.

The insertion tube portion 43 is fitted into the opening 421 of the holding plate 42 along the width direction W, and is positioned so that a portion of the end of the upper side Hu (referred to as the fitting end portion 43b) abuts against the horizontal edge portion 421b that forms the opening 421 of the holding plate 42.

In more detail, the insertion tube portion 43 is fitted into the main surface of the left side Wl of the retaining plate 42 on which the opening 421 is provided, by the thickness of the retaining plate 42. Two points on the outer circumferential surface of the insertion tube portion 43 abut against a corner 423 formed by the main surface of the left side Wl of the retaining plate 42 and a pair of vertical edges 421a that form the opening 421. Among the ends of the upper side Hu of the insertion tube portion 43, the fitting end 43b that fits into the opening 421 abuts against the horizontal edge 421b that forms the opening 421.

The welded portion 44 is a bead that protrudes along the depth direction D or width direction W and fixes the insertion tube portion 43, which is fitted into the opening 421 of the retaining plate 42, to the retaining plate 42 as described above. The welded portion 44 includes a first welded portion 44a provided on the main surface of the left side Wl of the retaining plate 42, and a second welded portion 44b provided on a pair of vertical edge portions 421a that form the opening 421.

The first welded portion 44a is a bead that protrudes in an arc shape in the depth direction D, and is formed by fillet welding two points where the insertion cylindrical portion 43 and the corner portion 423 abut against the main surface of the left side Wl of the retaining plate 42. The first welded portion 44a is formed to have a length that is approximately the same as the length of the insertion cylindrical portion 43 in the up-down direction H.

The second welded portion 44b is a bead that protrudes in an arc shape in the width direction W, formed by fillet welding the two points where the insertion cylindrical portion 43 and the corner portion 423 abut to the vertical edge portion 421a. Note that, like the first welded portion 44a, the second welded portion 44b is formed with a length that is approximately the same as the length of the insertion cylindrical portion 43 in the vertical direction H. In other words, the insertion cylindrical portion 43 is welded and fixed to the retaining plate 42 at a total of four points, the first welded portion 44a and the second welded portion 44b, which are provided in two places each.

The fixing hardware 2 and connecting hardware 4 configured in this manner can be fixed to the corner portion A1 of the structural frame A with the diagonal brace 3 held by the connecting hardware 4, thereby forming an earthquake-resistant unit 1 that has sufficient strength against the tensile force F1 acting on the diagonal brace 3.

A method of assembling the earthquake-resistant unit 1 for reinforcing the structural frame A will be described below with reference to Figs.
First, the fixing hardware 2 is placed at each of the opposing corners A1 of the structural frame A. Then, fixing bolts 300 are inserted and fastened into the central through-hole 212 and the side through-holes 213 of the horizontal facing portion 211 and the vertical through-holes 222 of the vertical facing portion 221, thereby fixing the fixing hardware 2 to the corners A1 of the structural frame A. An anchor bolt (not shown) for a hold-down hardware that is fastened to a concrete slab or the like located below the horizontal member 100 is inserted into the first central through-hole 212a of the central through-hole 212.

The vertical through holes 222 of the vertical facing portion 221 are provided in multiple rows, each row consisting of a pair of first through hole groups 222a spaced a predetermined distance apart in the depth direction D, and a pair of second through hole groups 222b spaced narrower in the depth direction D than the first through hole groups 222a. This increases the horizontal fixing force, which tends to be weaker in relation to the vertical fixing force, and allows the fixing hardware 2 to be fixed more reliably to the corner portion A1 of the structural frame A.

Then, the connecting hardware 4 is connected to the fixed hardware 2 fixed to the opposing corners A1 of the structural frame A (see Figures 2 and 3). In more detail, a pair of connecting plates 41 of the connecting hardware 4 is placed between a pair of support plates 20 of the fixed hardware 2. Next, the circular support plate through hole 203 provided in the support plate 20 of the fixed hardware 2 and the circular connecting plate through hole 411 provided in the connecting plate 41 of the connecting hardware 4 are arranged so as to be concentric. In this state, the connecting bolt 34 with the connecting washer 35 attached is inserted into the support plate through hole 203 and the connecting plate through hole 411. Then, the connecting nut 32b is fastened to the tip portion of the connecting bolt 34 protruding from the opposing main surfaces of the connecting plate 41 of the connecting hardware 4. This allows the fixing hardware 2 and the connecting hardware 4 to be connected.

The fixed hardware 2 and connecting hardware 4 are connected by the circular support plate through hole 203 and connecting plate through hole 411, respectively, so the connecting hardware 4 can be pivoted relative to the fixed hardware 2 around the center of the circular support plate through hole 203 and connecting plate through hole 411. This allows the connecting hardware 4 to be connected to the fixed hardware 2 at a desired angle depending on the size of the structural frame A and the length of the brace 3 used. This improves the versatility of the seismic unit 1.

Next, the diagonal brace 3 is attached to the connecting hardware 4 connected to the fixed hardware 2. More specifically, the diagonal brace 3 is inserted into the diagonal brace through hole 431 of the cylindrical insertion tube portion 43 provided on the connecting hardware 4 until the threads 31 provided on both ends of the diagonal brace 3 are exposed from the insertion tube portion 43. Then, the nut 32 and washer 33 are fastened and fixed to the threads 31 exposed from the insertion tube portion 43. At this time, the nut 32 is screwed in so that there is no play in the diagonal brace 3 inserted into the insertion tube portion 43. This allows the connecting hardware 4 to hold the diagonal brace 3.

As described above, by connecting the connecting hardware 4 to the fixed hardware 2 fixed to the opposing corner portions A1 of the structural frame A and having the diagonal brace 3 held by the connecting hardware 4, it is possible to create an earthquake-resistant unit 1 having sufficient strength to withstand the tensile force F1 transmitted from the diagonal brace 3.
A case where a force is applied in the horizontal direction (width direction W) to a rectangular structural frame A to which an earthquake-resistant unit 1 is attached will be briefly described below with reference to FIG.

When a force is applied to the right side Wr in the width direction W of the square structural frame A to which the earthquake-resistant unit 1 is attached, the square structural frame A tries to deform into a parallelogram. In other words, one of the diagonal diagonal braces 3 arranged on the structural frame A tries to extend, and the other diagonal brace 3 tries to shorten. Therefore, a tensile force F1 acts on the diagonal brace 3 on the extending side, pulling it from the center of the longitudinal direction L of the diagonal brace 3 toward both ends via the fixing metal 2 and the connecting metal 4.

In more detail, when the rectangular structural frame A tries to deform into a parallelogram, the spacing between the fixing hardware 2 arranged on the diagonal of the expanding side tends to widen. When the spacing between the fixing hardware 2 tends to widen, the spacing between the connecting hardware 4 connected to the fixing hardware 2 by the connecting bolts 34 also tends to widen.

The nut 32 is screwed onto the end of the diagonal brace 3 inserted into the cylindrical insertion portion 43 of the connecting hardware 4, so the force that tries to widen the gap between the connecting hardware 4 is input as a tensile force F1 to the diagonal brace 3 via the nut 32 abutting the cylindrical insertion portion 43. In other words, the nut 32 functions as a locking portion 5 that locks the diagonal brace 3 to which the tensile force F1 has been input, to the cylindrical insertion portion 43.

However, the diagonal brace 3, which is made of high-tensile steel that has a higher tensile strength than general structural rolled steel, resists the tensile force F1. Therefore, the diagonal brace 3 on which the tensile force F1 acts does not stretch, and the tensile force F1 caused by the gap between the fixed metal pieces 2 trying to widen acts on the fixed metal pieces 2 and the connecting metal pieces 4. At that time, the tensile force F1 acts particularly on the joints between the retaining plate 42, the insertion tube portion 43, and the welded portion 44 of the fixed metal pieces 2 and the connecting metal pieces 4, which tend to have lower strength than other parts.

The insertion tube portion 43 to which the tensile force F1 is transmitted is fitted into the main surface of the left side Wl of the retaining plate 42 on which the opening 421 is provided in the connecting hardware 4 by the thickness of the retaining plate 42. Furthermore, welds 44 that weld and fix the insertion tube portion 43 to the retaining plate 42 are provided over the entire length of the insertion tube portion 43 in the vertical direction H at four locations in total: two locations on the main surface of the left side Wl of the retaining plate 42 and two locations on the vertical edge portion 421a that forms the opening 421.

As a result, the insertion tube portion 43 can be firmly fixed to the retaining plate 42 by the welded portions 44 provided at four locations, making it possible to provide the connecting hardware 4 with sufficient strength against the tensile force F1 transmitted from the diagonal brace 3.

Furthermore, among the ends of the upper side Hu of the insertion tube portion 43, the insertion end portion 43b that fits into the opening 421 abuts against the horizontal edge portion 421b that forms the opening 421. This allows the tensile force F1 acting on the diagonal brace 3 to be transmitted to the connecting hardware 4 having the opening 421. Therefore, the tensile force F1 acting on the welded portion 44 can be reduced, and the insertion tube portion 43 can be prevented from falling off the retaining plate 42. Therefore, the connecting hardware 4 can have sufficient strength against the tensile force F1 transmitted from the diagonal brace 3.

The earthquake-resistant unit 1 as described above can exhibit sufficient strength against the tensile force F1 acting on the diagonal brace 3.
More specifically, as described above, the earthquake-resistant unit 1 includes a fixing hardware 2 fixed to a corner A1 of a rectangular structural frame A surrounded by horizontal members 100 and vertical members 200, a steel rod-shaped diagonal brace 3 connecting opposing corners A1 of the structural frame A, and a steel connecting hardware 4 that holds the end of the diagonal brace 3 and is connected to the fixing hardware 2. An engaging portion 5 is provided at the end of the diagonal brace 3. The connecting hardware 4 includes a cylindrical insertion tube portion 43 through which the end side of the diagonal brace 3 is inserted and to which the engaging portion 5 is engaged by the action of a tensile force F1 on the diagonal brace 3, and a connecting body portion 40 that is pivotally connected to the fixing hardware 2 and to which the insertion tube portion 43 is fixed. The connecting body 40 is provided with a retaining plate 42 that positions the insertion tubular portion 43 along the up-down direction H of the diagonal brace 3, and the retaining plate 42 is provided with an opening 421 that penetrates in a width direction W intersecting with the up-down direction H and into which a circumferential portion of the insertion tubular portion 43 fits. Welded portions 44 that weld the insertion tubular portion 43 and the retaining plate 42 along the up-down direction H are provided for the insertion tubular portion 43 that fits into the opening 421 at four locations on both sides of the depth direction D of the retaining plate 42 and on both sides of the depth direction D intersecting with the up-down direction H and the width direction W.

When a large horizontal force is applied due to an earthquake or the like, the structural frame A equipped with the earthquake-resistant unit 1 described above will resist the force that tends to deform the structural frame A into a parallelogram. At that time, a tensile force F1 acts on the diagonal brace 3, pulling it from the center of the longitudinal direction L of the diagonal brace 3 toward both ends via the fixed metal fittings 2 and connecting metal fittings 4. The steel rod-shaped diagonal brace 3 does not yield even when a large tensile force F1 is applied and can resist the tensile force F1, but there is a risk that the connecting metal fittings 4 that hold the diagonal brace 3 will not be able to resist the tensile force F1 and will be damaged, and the effect of the diagonal brace 3 will not be fully demonstrated.

In response to the above concerns, in the present invention, when the above-mentioned tensile force F1 acts on the diagonal brace 3, the locking portion 5 provided at the end of the diagonal brace 3 and the insertion tubular portion 43 provided on the connecting hardware 4 and through which the diagonal brace 3 can be inserted are locked. As a result, the tensile force F1 is transmitted from the locking portion 5 to the insertion tubular portion 43, but the welded portions 44 that weld and fix the insertion tubular portion 43 to the retaining plate 42 are provided in four places. Therefore, the insertion tubular portion 43 can be firmly fixed to the retaining plate 42. Therefore, the connecting hardware 4 can be prevented from being damaged by the tensile force F1 acting on the inserted diagonal brace 3.

In addition, the insertion tubular portion 43 that fits into the opening 421 is positioned so that the fitting end portion 43b, on which the tensile force F1 input from the diagonal brace 3 acts, abuts the horizontal edge portion 421b that forms the opening 421.
As a result, the fitting end 43b of the insertion tubular portion 43 comes into contact with the horizontal edge portion 421b of the opening 421, so that the tensile force F1 acting on the diagonal brace 3 can be transmitted to the connecting hardware 4 having the opening 421. This reduces the tensile force F1 acting on the welded portion 44, and in addition to being fixed by the welded portion 44, the insertion tubular portion 43 can be fixed more firmly to the retaining plate 42. This more reliably prevents the connecting hardware 4 from being damaged by the tensile force F1 acting on the inserted diagonal brace 3.

The retaining plate 42 is formed in a plate shape having the same thickness as the insertion cylindrical portion 43. This ensures a sufficient contact area at the contact point between the insertion end 43b of the insertion cylindrical portion 43 and the horizontal edge portion 421b of the opening 421. Therefore, the tensile force F1 acting on the diagonal brace 3 can be reliably transmitted by the connecting hardware 4 having the opening 421, and the tensile force F1 acting on the welded portion 44 can be further reduced. Therefore, the connecting hardware 4 can be more reliably prevented from being damaged by the tensile force F1 acting on the inserted diagonal brace 3.

The insertion tube portion 43 is arranged so that its depth of insertion into the opening 421 is equal to the thickness of the retaining plate 42. This ensures a sufficient abutment length in the width direction W for the insertion tube portion 43 to fit into the opening 421 at the abutment point between the fitting end portion 43b of the insertion tube portion 43 and the horizontal edge portion 421b of the opening 421, thereby further improving the fixing strength of the insertion tube portion 43 to the retaining plate 42. Furthermore, since the insertion tube portion 43 does not protrude from the retaining plate 42 in the width direction W, it is possible to prevent the insertion tube portion 43 from interfering with other members and being damaged.

The welded portion 44 is formed over the entire length of the insertion tube portion 43 in the vertical direction H. This ensures a sufficient welding length for welding the insertion tube portion 43 to the retaining plate 42, so that the insertion tube portion 43 can be more firmly fixed to the retaining plate 42. This allows the construction of an earthquake-resistant unit 1 with higher fixing strength.

The diagonal braces 3 are also made of ultra-high tensile steel or high tensile steel, which has a higher tensile strength than general structural rolled steel. This allows the tensile strength of the diagonal braces 3 themselves to be improved. Therefore, by combining the diagonal braces 3 made of ultra-high tensile steel or high tensile steel, which has a high tensile strength, with the steel connecting hardware 4, the strength of the entire seismic unit 1 can be improved.

The fixing hardware 2 also has a horizontal facing portion 211 and a vertical facing portion 221 that face the inner surfaces of the horizontal member 100 and the vertical member 200 that constitute the corner portion A1. The vertical facing portion 221 has multiple rows of vertical through holes 222 through which the fixing bolts 300 are inserted, including a pair of first through hole groups 222a spaced a predetermined distance apart in the depth direction D, and a pair of second through hole groups 222b spaced a narrower distance apart in the depth direction D than the first through hole groups 222a. The first through hole groups 222a and the second through hole groups 222b are alternately arranged two by two along the vertical direction H.

This allows the fixing hardware 2 to be firmly fixed to the horizontal members 100 and the vertical members 200. Therefore, the fixing hardware 2 can be fixed with sufficient fixing strength against the strength of the diagonal brace 3 made of ultra-high tensile steel or high tensile steel. Therefore, the strength of the entire seismic unit 1 can be further improved.

In the configuration of this invention and the correspondence between the above-mentioned embodiment, the horizontal member of this invention corresponds to the horizontal member 100, and the same applies below.
The vertical member corresponds to vertical member 200,
The opening corresponds to the structural frame A,
The corner portion corresponds to the corner portion A1,
The fixing device corresponds to the fixing hardware 2,
The brace corresponds to brace 3,
The connecting hardware corresponds to connecting hardware 4,
The locking portion corresponds to the locking portion 5,
The tensile force corresponds to the tensile force F1,
The insertion cylindrical portion corresponds to the insertion cylindrical portion 43,
The connecting body portion corresponds to the connecting body portion 40,
The longitudinal direction corresponds to the longitudinal direction L,
The arrangement portion corresponds to the holding plate 42,
The thickness direction corresponds to the width direction W,
The insertion opening corresponds to the opening 421;
The width direction corresponds to the width direction W,
The weld corresponds to weld 44,
The earthquake-resistant unit corresponds to earthquake-resistant unit 1.
The end face on the pulling direction side corresponds to the fitting end 43b,
The edge forming the insertion opening corresponds to the horizontal edge portion 421b.
The horizontal facing portion corresponds to the horizontal facing portion 211,
The vertical facing portion corresponds to the vertical facing portion 221,
The fixing member corresponds to the fixing bolt 300.
The first group corresponds to the first through hole group 222a,
The second group corresponds to the second through hole group 222b, however, the present invention is not limited to the above embodiment and many embodiments can be obtained.

For example, in this embodiment, the locking portion 5 that locks the diagonal brace 3 to which the tensile force F1 is applied to the insertion tubular portion 43 is configured with a nut 32 attached to the end of the diagonal brace 3, but is not limited to this configuration as long as it can lock the diagonal brace 3 to which the tensile force F1 is applied. For example, a flange shape larger than the insertion tubular portion 43 may be formed at the end of the diagonal brace 3 that has been inserted into the insertion tubular portion 43 in advance. Also, for example, the insertion tubular portion 43 may be provided with a rib that protrudes toward the diagonal brace through hole 431, and the diagonal brace 3 may be provided with a groove into which the rib fits, so that the structure locks the diagonal brace 3 by fitting them together.

In addition, the welded portion 44 is not limited to being aligned along the longitudinal direction L, but may be aligned in a direction intersecting the longitudinal direction L at a predetermined angle. In that case, it is preferable that the welded portion 44 intersects the vertical direction H at an angle of 45° or less from the viewpoints of the direction of the tensile force F1 acting on the diagonal brace 3 and the welding fixing force of the insertion cylindrical portion 43 to the retaining plate 42.
Further, the welded portion 44 is not limited to being provided continuously along the vertical direction H, but may be provided in the form of dashed lines at predetermined intervals along the vertical direction H, for example.

The insertion tube portion 43 is formed as a cylinder having a predetermined diameter, but as long as four welded portions 44 for welding and fixing the insertion tube portion 43 to the retaining plate 42 can be provided, the shape is not limited to this, and it may be formed as a polygon having a triangle or more sides.

Furthermore, the connecting body 40 of the connecting hardware 4 is formed in a substantially U-shape when viewed from the longitudinal direction L by a pair of connecting plates 41 and a retaining plate 42 that connects the connecting plates 41, but is not limited to this configuration as long as it can provide a cylindrical insertion portion 43 through which the diagonal brace 3 can be inserted. For example, in addition to the retaining plate 42 that connects the right side Wr of the connecting plate 41, a second retaining plate 42a that connects the left side Wl can be added. In this case, by providing the second retaining plate 42a with a second opening 421x similar to the opening 421 of the retaining plate 42, two additional welds 44x can be provided in addition to the four welds 44 of the retaining plate 42. Therefore, it is possible to configure an earthquake-resistant unit 1 that can exert even more sufficient resistance against the tensile force F1 acting on the diagonal brace 3.

Furthermore, in the connecting hardware 4, the thickness of the connecting body 40, which is a plate material, and the thickness of the insertion tube portion 43, which is a cylindrical body, are formed to be approximately the same, but are not limited to this configuration. For example, the connecting body 40 may be formed to be thicker than the insertion tube portion 43. In this case, the contact area at the abutment point between the fitting end portion 43b of the insertion tube portion 43 and the horizontal edge portion 421b of the opening portion 421 of the connecting body 40 can be further increased. Therefore, the fixing strength of the insertion tube portion 43 to the connecting body 40 can be further increased.

1... Earthquake-resistant unit 2... Fixed metal fitting 3... Drawstring 4... Connecting metal fitting 5... Locking portion 221... Horizontal facing portion 221... Vertical facing portion 40... Connecting body portion 43... Inserted cylindrical portion 42... Retaining plate 43b... Inserted end portion 44... Welded portion 100... Horizontal member 200... Vertical member 222a... First through hole group 222b... Second through hole group 300... Fixing bolt 421... Opening 421b... Horizontal edge portion A... Structural frame A1... Corner portion F1... Tensile force H... Height direction W... Width direction L... Longitudinal direction

Claims (7)

A fixture fixed to a corner of a rectangular opening surrounded by horizontal and vertical members;
A steel rod-shaped brace connecting the opposing corners of the opening;
A steel connecting hardware is provided to hold the end of the brace and to be connected to the fixing device,
A locking portion is provided at the end of the brace,
The connecting hardware includes:
A cylindrical insertion portion into which the end side of the diagonal brace is inserted and into which the locking portion is locked by the action of a tensile force on the diagonal brace;
a connecting body portion pivotally connected to the fixing device and to which the insertion tube portion is fixed,
The connecting body portion,
A placement portion is provided for placing the insertion cylindrical portion along the longitudinal direction of the brace,
The arrangement portion is provided with a fitting opening that penetrates the arrangement portion in a thickness direction intersecting with the longitudinal direction and into which a circumferential portion of the insertion tube portion is fitted,
An earthquake-resistant unit in which welds are provided at four locations on both sides of the thickness direction of the placement portion and on both sides of the width direction that intersects the longitudinal direction and the thickness direction of the insertion tubular portion that fits into the insertion opening, by welding the insertion tubular portion and the placement portion along the longitudinal direction. The earthquake-resistant unit described in claim 1, wherein the insertion tubular portion that fits into the insertion opening is positioned so that the end face on the tensile direction side on which the tensile force input from the diagonal brace acts abuts against the edge that forms the insertion opening. The earthquake-resistant unit according to claim 2 , wherein the arrangement portion is formed in a plate shape having a thickness equal to or greater than that of the insertion cylindrical portion. The earthquake-resistant unit according to claim 3 , wherein the insertion tube portion is disposed so that a fitting depth thereof into the fitting opening is equal to a thickness of the placement portion. The earthquake-resistant unit according to claim 2 , wherein the welded portion is formed over the entire length of the insertion tube portion in the longitudinal direction. 6. The earthquake-resistant unit according to claim 1, wherein the braces are made of ultra-high tensile steel or high tensile steel having a tensile strength higher than that of general structural rolled steel. The fastener has a horizontal facing portion and a vertical facing portion that face the inner surfaces of the horizontal member and the vertical member that form the corner portion, respectively;
In the vertical facing portion, fixing members for fixing to the vertical members are provided in a first group arranged at a predetermined interval in the width direction and a second group arranged at an interval narrower than that of the first group in a plurality of rows,
The seismic unit according to claim 6 , wherein the first groups and the second groups are alternately provided along the longitudinal direction.

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