Earthquake resistant unit

Abstract

To provide an earthquake resistant unit capable of exerting sufficient strength against a tensile force acting on a brace.SOLUTION: An earthquake resistant unit is equipped with fixed metals 2 fixed to corners A1 of a square structural frame A bounded by horizontal members 100 and vertical members 200, steel bar-shaped braces 3 each connecting the opposing corners A1, and steel connecting metals 4 that hold the end parts of the braces 3 and are connected to the fixed metals 2. A fastening part 5 is provided at the end of the brace 3, and the connecting metal 4 is provided with a cylindrical insertion tubular part 43 into which the end of the brace 3 is inserted and the fastening part 5 is fastened, and a connecting body part 40 that is connected to the fixed metal 2 and to which the insertion tubular part 43 is fastened. The connecting body part 40 is provided with a retaining plate 42 on which the insertion tubular part 43 is placed. The retaining plate 42 is provided with an opening 421 into which a circumferential part of the insertion tubular part 43 fits. Welding parts 44 welded to the insertion tubular part 43 and the retaining plate 42 are provided at four locations.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an earthquake-resistant unit that can increase the earthquake resistance strength of a building. [Background technology]

[0002] 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.

[0003] When a large force is applied due to an earthquake or the like, a building equipped with the above-mentioned earthquake-resistant unit 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 brace, pulling the connecting metal fittings and the fixing device, but there is a problem that the connecting metal fittings cannot withstand the tensile force and fall off the fixing device, or the connecting metal fittings fall off together with the fixing device from the corner of the opening. Therefore, Patent Document 1 discloses an earthquake-resistant unit in which the diagonal brace is unlikely to come off the connecting metal fittings and the fixing device even when a tensile force is applied to the diagonal brace.

[0004] The earthquake-resistant unit of Patent Document 1 has a connecting metal fitting fixed to a fixing device, which 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, in the earthquake-resistant unit of Patent Document 1, the diagonal braces are made of wood, and so the tensile strength of the diagonal braces themselves is not high, making it possible for the diagonal braces to be damaged by a large tensile force, and therefore it was not possible to sufficiently improve the earthquake resistance strength of the entire earthquake-resistant unit. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2014-152566 A Summary of the Invention [Problem to be solved by the invention]

[0006] An object of the present invention is to provide an earthquake-resistant unit that can exhibit sufficient strength against the tensile force acting on the braces. [Means for solving the problem]

[0007] This invention is provided with a fixture fixed to a 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, the end of the diagonal brace is provided with a locking part, the connecting hardware has 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 the connecting hardware is pivotally connected to the fixture and through which the insertion tube part is fixed. the connecting body portion is provided with a positioning portion for positioning the insertion tubular portion along the longitudinal direction of the diagonal brace, the positioning portion is provided with an insertion opening that penetrates in a thickness direction intersecting with the longitudinal direction and into which a circumferential portion of the insertion tubular portion is fitted, and the insertion tubular portion that fits into the insertion opening is provided with welded portions that weld the insertion tubular portion and the positioning portion along the longitudinal direction at four locations on both sides of the positioning portion in the thickness direction and on both sides in a width direction intersecting with the longitudinal direction and the thickness direction.

[0008] 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.

[0009] 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 application of a tensile force to 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.

[0010] More specifically, the diagonal braces connecting the opposing corners of the rectangular opening surrounded by the horizontal and vertical members are made of steel rods, and are attached to the opening via fixtures fixed to the corners and connecting hardware that connects the fixtures to the diagonal braces.

[0011] When a large horizontal force is applied due to an earthquake or the like, the opening provided with the braces resists the force that tends to deform the opening into a parallelogram. At that time, a tensile force that pulls the braces acts on the braces via the fixing device and the connecting metal fittings.

[0012] The steel rod-shaped diagonal 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 connecting metal that holds the diagonal braces will not be able to withstand the tensile force and will be damaged, and so the effect of the diagonal braces will not be fully realized.

[0013] 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 welded portions that weld and fix the insertion tubular portion to the arrangement portion are provided at four locations, the insertion tubular portion can be firmly fixed to the arrangement portion. This prevents the connecting hardware from being damaged by the tensile force acting on the inserted diagonal brace. This allows the construction of an earthquake-resistant unit that can exhibit sufficient strength against the tensile force acting on the diagonal brace.

[0014] 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 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 in addition to the fixation by the welded part, the insertion tube part can be fixed to the arrangement part more firmly. Therefore, the connecting hardware can be more reliably prevented from being damaged by the tensile force acting on the inserted brace.

[0015] 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.

[0016] 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.

[0017] 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, since a sufficient welding length for welding the insertion tube part to the arrangement part can be secured, the insertion tube part can be fixed to the arrangement part more firmly, and therefore, a seismic unit with higher fixing strength can be constructed.

[0018] As another aspect of the present invention, the 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.

[0019] In another aspect of the invention, the fastener has a horizontal facing portion and a vertical facing portion facing the inner surfaces of the horizontal member and the vertical member that constitute the corner portion, respectively, and in the vertical facing portion, fastening members for fixing to the vertical member are provided in multiple rows of 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, and the first group and the second group are arranged alternately along the longitudinal direction.

[0020] According to the present invention, the fixing device can 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. Effect of the Invention

[0021] According to the present invention, it is possible to provide an earthquake-resistant unit that can exhibit sufficient strength against the tensile force acting on the diagonal brace. [Brief description of the drawings]

[0022] [Figure 1] Front view of structural frame reinforced with seismic units. [Diagram 2] FIG. [Diagram 3] FIG. [Figure 4] FIG. [Diagram 5] An explanatory diagram of connecting hardware. [Figure 6] An explanatory diagram of connecting hardware. [Figure 7] An enlarged cross-sectional view of a connecting metal piece passing through the center of a brace in a seismic unit. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] 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 the main parts of the seismic units 1. Fig. 3 shows an exploded perspective view of the seismic units 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.

[0024] 4 to 7 will be described in detail. FIG. 4(a) shows a schematic perspective view of the fixing hardware 2 as viewed from the upper side Hu and the front side Da, FIG. 4(b) shows a schematic plan view of the fixing hardware 2, FIG. 4(c) shows a schematic rear view of the fixing hardware 2, and FIG. 4(d) shows a schematic side view of the fixing hardware 2. FIG. 5(a) shows a schematic perspective view of the connecting hardware 4 as viewed from the upper side Hu and the front side Da, FIG. 5(b) shows a schematic perspective view of the connecting hardware 4 as viewed from the lower side Hd and the front side Da, and FIG. 5(c) shows an enlarged bottom view of the connecting hardware 4. FIG. 6(a) shows a cross-sectional view taken along the line AA in FIG. 5(c), and FIG. 6(b) shows an enlarged view of part a in FIG. 6(a). FIG. 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 hardware 4. FIG. 7 is a cross-sectional view corresponding to FIG. 6(a).

[0025] 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 front side Da, and the right side is the back 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.

[0026] As shown in Figures 1 and 2, the earthquake-resistant unit 1 is fixed to a square structural frame A surrounded by horizontal members 100 such as foundations or beams, and vertical members 200 such as through columns or pipe columns, thereby reinforcing the structural frame A against horizontal forces input by earthquakes, etc.

[0027] 2 and 3, the earthquake-resistant unit 1 as described above is composed of fixing hardware 2 fixed to the corner portion A1 of the structural frame A, steel rod-shaped diagonal braces 3 connecting the opposing corner portions A1 of the structural frame A, and steel connecting hardware 4 holding the ends of the diagonal braces 3 and connecting them to the fixing hardware 2. In this embodiment, the extension direction of the diagonal braces 3 is defined as the longitudinal direction L.

[0028] As shown in FIG. 4(a), the fixing hardware 2 is integrally formed with 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 corners A1 on the lower side Hd and the left side Wl among the four corners A1 of the structural frame A, and when attaching to other corners A1, the fixing hardware 2 is attached in an appropriate orientation.

[0029] In addition, the support plate 20 has a first notch 201 on the upper side Hu and right side Wr, which is cut out in a pentagonal shape, and a second notch 202 which is cut out in a quadrangular shape from the end of the right side Wr of the first notch 201 and the end of the lower side Hd to a certain portion in the vertical direction H.

[0030] Furthermore, a circular support plate through hole 203 having a predetermined diameter is provided at a portion spaced a predetermined distance in the up-down direction H from the first cutout portion 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 substantially the same as the length of the horizontal member 100 and the vertical member 200 in the depth direction D, as shown in FIG.

[0031] 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.

[0032] 4(a) and 4(c), the horizontal facing portion 211 is a plate material having a thickness substantially equal to that of the support plate 20 and a substantially rectangular shape when viewed from the longitudinal direction L. The length of the horizontal facing portion 211 in the depth direction D substantially equals 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 substantially equals the length of the support plate 20 in the width direction W.

[0033] 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 a first central through hole 212a, and the one on the right side Wr is 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.

[0034] The side through holes 213 are spaced apart from the central through hole 212 at a predetermined interval toward both ends in the depth direction D, and two side through holes 213 are provided along the width direction W at an interval greater than that between the two central through holes 212. In other words, the side through holes 213 are provided at 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.

[0035] 4(a) and 4(d), the vertical facing portion 221 is a plate material having a substantially rectangular shape when viewed from the width direction W, and having a thickness substantially equal to 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 substantially matches the length of the horizontal facing portion 211 in the depth direction D, and the length of the vertical facing portion 221 in the up-down direction H substantially matches the length of the support plate 20 in the up-down direction H.

[0036] 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 an interval narrower 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 a diameter that is approximately the same, 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 at a right angle 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.

[0037] 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 that has a higher tensile strength than general structural rolled steel. The diagonal brace 3 has a thread 31 formed at both ends with a predetermined length, and a nut 32 and a washer 33 with a predetermined diameter can be attached to the thread 31.

[0038] As shown in Figure 5, the connecting hardware 4 is integrally formed of a connecting main body portion 40 that is connected to the support plate 20 of the fixed hardware 2, and an insertion tubular portion 43 that is fixed to the connecting main body portion 40 and through which the diagonal brace 3 is inserted and held.

[0039] The connecting body 40 is composed of a pair of connecting plates 41 and a holding plate 42 that connects the pair of connecting plates 41. The holding plate 42 is provided with a welded portion 44 to which the insertion cylindrical portion 43 is fixed by welding.

[0040] 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 a diameter substantially the same 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 fixing metal 2 in the depth direction D. Specifically, the two connecting plates 41 are provided at an interval such that the outer main surfaces of the two connecting plates 41 in the depth direction D are substantially the same as the inner main surfaces of the two support plates 20 in the depth direction D.

[0041] The retaining plate 42 is a plate member 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 that is a direction perpendicular to the main surface of the connecting plate 41. In other words, the connecting body 40 constituted by the pair of connecting plates 41 and the retaining plate 42 that connects the pair of connecting plates 41 is formed to be substantially U-shaped when viewed from the longitudinal direction L. The thickness of the retaining plate 42 is formed to be substantially the same as the thickness of the pair of connecting plates 41.

[0042] An opening 421 is provided in the center of the holding plate 42 in the depth direction D, penetrating a part of the holding plate 42 in the thickness direction. Further, a pair of extension pieces 422 extending in the up-down direction H in a substantially right-angled triangular shape are provided at the end of the lower side Hd of the holding plate 42, which is also at both end portions in the depth direction D.

[0043] The opening 421 is a notch cut in a generally rectangular shape at the center of the holding plate 42 in the depth direction D from an end of the lower side Hd of the holding plate 42, with a length shorter than the length of the holding 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 cylindrical portion 43 described later in the width direction W. 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.

[0044] The insertion tubular portion 43 is a tubular body having a diameter that is approximately equal to that of the nut 32 and the washer 33 attached to the end of the diagonal brace 3 along the radial direction along the depth direction D and the width direction W. The length of the insertion tubular portion 43 in the vertical direction H is approximately equal to 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 circumferential 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 equal to the thickness of the retaining plate 42.

[0045] The insertion cylindrical portion 43 is fitted into the opening 421 of the retaining 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 43b) abuts against the horizontal edge portion 421b that forms the opening 421 of the retaining plate 42.

[0046] More specifically, the insertion cylindrical portion 43 is fitted into the main surface of the left side Wl of the holding plate 42 on which the opening 421 is provided, by the thickness of the holding plate 42. Two points on the outer circumferential surface of the insertion cylindrical portion 43 abut against a corner 423 formed by the main surface of the left side Wl of the holding plate 42 and a pair of vertical edges 421a forming the opening 421. Among the ends of the upper side Hu of the insertion cylindrical portion 43, a fitting end 43b fitted into the opening 421 abuts against a horizontal edge 421b forming the opening 421.

[0047] The welded portion 44 is a bead that protrudes along the depth direction D or the width direction W and fixes the insertion cylindrical portion 43, which is fitted into the opening 421 of the holding plate 42, to the holding 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 holding plate 42 and a second welded portion 44b provided on a pair of vertical edge portions 421a that form the opening 421.

[0048] 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 each other to 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 equal to the length of the insertion cylindrical portion 43 in the up-down direction H.

[0049] The second welded portion 44b is a bead that protrudes in an arc shape in the width direction W, and is formed by fillet welding two points where the insertion cylindrical portion 43 and the corner portion 423 abut against the vertical edge portion 421a. Note that, like the first welded portion 44a, the second welded portion 44b is formed to have a length that is approximately equal to the length of the insertion cylindrical portion 43 in the up-down 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, namely, the first welded portion 44a and the second welded portion 44b, which are provided at two points each.

[0050] 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 having sufficient strength against the tensile force F1 acting on the diagonal brace 3.

[0051] 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 corner portions 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 to fix the fixing hardware 2 to the corner portion 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.

[0052] Here, the vertical through holes 222 of the vertical facing portion 221 are provided in multiple rows, 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 narrower in the depth direction D than the first through hole groups 222a. This increases the fixing force in the horizontal direction, which tends to be weaker in relation to fixing in the vertical direction, and allows the fixing hardware 2 to be fixed more reliably to the corner portion A1 of the structural frame A.

[0053] Then, the connecting hardware 4 is connected to the fixed hardware 2 fixed to the opposing corners A1 of the structural frame A (see Figs. 2 and 3). More specifically, a pair of connecting plates 41 of the connecting hardware 4 is arranged between a pair of support plates 20 of the fixed hardware 2. Then, 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 thereto 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 to each other.

[0054] In addition, since the fixing hardware 2 and the connecting hardware 4 are connected by the circular support plate through hole 203 and the connecting plate through hole 411, respectively, the connecting hardware 4 can be pivoted relative to the fixing hardware 2 about the center of the circular support plate through hole 203 and the connecting plate through hole 411. This allows the connecting hardware 4 to be connected to the fixing hardware 2 at a desired angle depending on the size of the structural frame A and the length of the diagonal braces 3 used. Therefore, the versatility of the seismic unit 1 can be improved.

[0055] Next, the diagonal brace 3 is attached to the connecting hardware 4 connected to the fixing 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 the 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 the diagonal brace 3 inserted into the insertion tube portion 43 has no play. This allows the connecting hardware 4 to hold the diagonal brace 3.

[0056] 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 connecting hardware 4 hold the diagonal brace 3, 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 input 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.

[0057] When a force is input to the right side Wr in the width direction W of the square structural frame A to which the seismic unit 1 is attached, the square structural frame A tries to deform into a parallelogram. In other words, one of the diagonal diagonal members 3 of the structural frame A tries to extend, and the other diagonal member 3 tries to shorten. Therefore, a tensile force F1 acts on the diagonal diagonal member 3 on the extending side, pulling it from the center in the longitudinal direction L of the diagonal member 3 toward both ends via the fixing metal member 2 and the connecting metal member 4.

[0058] More specifically, when the rectangular structural frame A tries to deform into a parallelogram, the distance between the fixing hardware 2 arranged diagonally on the expanding side tends to increase. When the distance between the fixing hardware 2 increases, the distance between the connecting hardware 4 connected to the fixing hardware 2 by the connecting bolts 34 also tends to increase.

[0059] Since the nut 32 is screwed onto the end of the diagonal brace 3 inserted into the insertion tubular portion 43 of the connecting hardware 4, 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 insertion tubular 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 insertion tubular portion 43.

[0060] However, the diagonal brace 3 made of high-tensile steel, which 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 elongate, and the tensile force F1 caused by the gap between the fixing hardware 2 trying to widen acts on the fixing hardware 2 and the connecting hardware 4. At that time, the tensile force F1 acts particularly on the joint between the retaining plate 42, the insertion tube portion 43, and the welded portion 44 of the fixing hardware 2 and the connecting hardware 4, which are likely to have lower strength than other portions.

[0061] The insertion tubular 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, by the thickness of the retaining plate 42, in the connecting hardware 4. Furthermore, welds 44 for welding and fixing the insertion tubular portion 43 to the retaining plate 42 are provided over the entire length of the insertion tubular portion 43 in the up-down direction H, at a total of four locations: two locations on the main surface of the left side Wl of the retaining plate 42 and two locations on the vertical edge portions 421a that form the opening 421.

[0062] This allows the insertion tubular portion 43 to be firmly fixed to the retaining plate 42 by the welded portions 44 provided at four locations, resulting in a connecting hardware 4 with sufficient strength against the tensile force F1 transmitted from the diagonal brace 3.

[0063] Furthermore, among the ends of the upper side Hu of the insertion tube portion 43, the fitting end portion 43b fitting 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. As a result, 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.

[0064] 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 the fixing hardware 2 fixed to the corner A1 of the rectangular structural frame A surrounded by the horizontal members 100 and the vertical members 200, the steel rod-shaped diagonal braces 3 connecting the opposing corners A1 of the structural frame A, and the steel connecting hardware 4 that holds the end of the diagonal brace 3 and is connected to the fixing hardware 2. An engaging part 5 is provided at the end of the diagonal brace 3. The connecting hardware 4 includes a cylindrical insertion tube part 43 through which the end side of the diagonal brace 3 is inserted and to which the engaging part 5 is engaged by the action of the tensile force F1 on the diagonal brace 3, and a connecting body part 40 that is pivotally connected to the fixing hardware 2 and to which the insertion tube part 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 part of the insertion tubular portion 43 fits. The insertion tubular portion 43 that fits into the opening 421 is provided with welded portions 44 that weld the insertion tubular portion 43 and the retaining plate 42 along the up-down direction H 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.

[0065] When a large horizontal force is applied due to an earthquake or the like, the structural frame A equipped with the earthquake-resistant units 1 as described above will resist a 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 diagonal brace 3 in the longitudinal direction L toward both ends via the fixed metal fittings 2 and the 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.

[0066] 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 holding plate 42 are provided at four locations. Therefore, the insertion tubular portion 43 can be firmly fixed to the holding 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.

[0067] 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.

[0068] In addition, 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 fitting 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. This makes it possible to more reliably prevent the connecting hardware 4 from being damaged by the tensile force F1 acting on the inserted diagonal brace 3.

[0069] In addition, the insertion tubular portion 43 is disposed so that the depth of insertion into the opening 421 is equal to the thickness of the holding plate 42. This ensures a contact length in the width direction W where the insertion tubular portion 43 fits into the opening 421 at the contact point between the fitting end portion 43b of the insertion tubular portion 43 and the horizontal edge portion 421b of the opening 421, thereby further improving the fixing strength of the insertion tubular portion 43 to the holding plate 42. Furthermore, since the insertion tubular portion 43 does not protrude from the holding plate 42 in the width direction W, it is possible to prevent the insertion tubular portion 43 from interfering with other members and being damaged.

[0070] Moreover, the welded portion 44 is formed over the entire length of the insertion cylindrical portion 43 in the up-down direction H. This makes it possible to ensure a sufficient welding length for welding the insertion cylindrical portion 43 to the holding plate 42, and therefore the insertion cylindrical portion 43 can be more firmly fixed to the holding plate 42. Therefore, it is possible to configure a seismic unit 1 with higher fixing strength.

[0071] In addition, the diagonal braces 3 are made of ultra-high tensile steel or high tensile steel, which has a higher tensile strength than general structural rolled steel. This improves the tensile strength of the diagonal braces 3 themselves. 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.

[0072] The fixing hardware 2 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 form the corner portion A1. The vertical facing portion 221 has vertical through holes 222 through which the fixing bolts 300 are inserted, and the vertical facing portion 221 has a pair of first through hole groups 222a arranged at a predetermined interval in the depth direction D and a pair of second through hole groups 222b arranged at a narrower interval 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 arranged alternately in pairs along the up-down direction H.

[0073] 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 members 3 made of ultra-high tensile steel or high tensile steel. Therefore, the strength of the entire seismic unit 1 can be further improved.

[0074] In the configuration of this invention and the correspondence with 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 structural frame A. The corner portion corresponds to the corner portion A1, The fixing device corresponds to 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 tube portion corresponds to the insertion tube 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-mentioned embodiment and many embodiments can be obtained.

[0075] For example, in this embodiment, the locking portion 5 that locks the diagonal interlocking body 3 to which the tensile force F1 is applied to the insertion tubular portion 43 is configured with the nut 32 attached to the end of the diagonal interlocking body 3, but is not limited to this configuration as long as it can lock the diagonal interlocking body 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 interlocking body 3 that is inserted in advance into the insertion tubular portion 43. Also, for example, a rib that protrudes toward the diagonal interlocking body through-hole 431 may be provided in the insertion tubular portion 43, and a groove into which the rib fits may be provided in the diagonal interlocking body 3, so that the diagonal interlocking body 3 is locked by fitting together.

[0076] 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 tube portion 43 to the holding plate 42. Further, the welded portions 44 are 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.

[0077] In addition, although the insertion tubular portion 43 is formed as a cylinder having a predetermined diameter, as long as four welding portions 44 for welding and fixing the insertion tubular portion 43 to the retaining plate 42 can be provided, the shape is not limited to this and may be formed as a polygon having a triangle or more sides.

[0078] 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 connecting 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 connecting the right side Wr of the connecting plate 41, a second retaining plate 42a connecting 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 the seismic unit 1 that can exert a sufficient resistance against the tensile force F1 acting on the diagonal brace 3.

[0079] 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. [Explanation of symbols]

[0080] 1. Earthquake-resistant unit 2…Fixing hardware 3... Muscular body 4…Connecting hardware 5…Latching part 221…Horizontal facing part 221...Vertical facing part 40…Connecting body 43... Insertion tube part 42...Holding plate 43b...Inset end 44…Welded section 100…Horizontal material 200…Vertical member 222a...first through hole group 222b…Second through hole group 300…Fixing bolt 421...Opening 421b…Horizontal edge A…Structural frame A1…Corner F1…Tensile force H: Height direction W: Width direction L…Longitudinal direction

Claims

1. 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 tube 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, The insertion tube-shaped portion that fits into the fitting opening is provided with welded portions that weld the insertion tube-shaped portion and the arrangement portion along the longitudinal direction at four locations on both sides of the arrangement portion in the thickness direction and on both sides of the width direction that intersects the longitudinal direction and the thickness direction. Earthquake resistant unit.

2. The insertion tubular portion that is inserted into the insertion opening is disposed so that an end face on a tensile direction side to which a tensile force input from the brace acts abuts against an end edge that forms the insertion opening. The earthquake-resistant unit according to claim 1 .

3. The arrangement portion is formed in a plate shape having a thickness equal to or greater than the thickness of the insertion tube portion. The earthquake-resistant unit according to claim 2.

4. The insertion tube portion is disposed so that the insertion depth into the insertion opening is equal to the thickness of the placement portion. The earthquake-resistant unit according to claim 3.

5. The welded portion is formed over the entire length of the insertion tube portion in the longitudinal direction. The earthquake-resistant unit according to claim 2.

6. The braces are made of ultra-high tensile steel or high tensile steel that has a higher tensile strength than general structural rolled steel. The earthquake-resistant unit according to any one of claims 1 to 5.

7. 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; A fixing member for fixing the vertical member to the vertical facing portion is provided. The nozzles are provided in a plurality of rows, each row including a first group spaced apart at a predetermined interval in the width direction and a second group spaced apart at a narrower interval than the first group, The first group and the second group are alternately provided along the longitudinal direction. The earthquake-resistant unit according to claim 6.

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