JP4347821B2 - Beam opening reinforcement structure - Google Patents

Description

  The present invention relates to a beam opening reinforcing structure that reinforces an opening formed in a beam constituting a building structure.

  H-beams or I-beams are used as beams for building structures. In such a building structure, an opening may be formed in the web portion of the beam in order to pass piping and wiring provided therein. In this case, for the purpose of preventing the strength of the beam from being lowered by the opening, a reinforcing plate is attached around the opening to reinforce the opening. As conventional beam opening reinforcing means, as shown in FIGS. 9 (a) and 9 (b), a reinforcing sleeve 21 is inserted into the opening 2 formed in the web 1a of the beam 1 made of H-shaped steel. Then, a method of reinforcing the corner portions of the both side surfaces of the web 1a and the outer peripheral surface of the sleeve 21 by fillet welding, or a plate formed in a ring shape as shown in FIGS. 10 (a) and 10 (b) There is a method in which 31 is brought into contact with the periphery of the opening 2 of the web 1a, and the inner peripheral edge and the outer peripheral edge of the plate 31 are welded to the web 1a in a ring shape for reinforcement. In FIGS. 9 (a) and 9 (b) and FIGS. 10 (a) and 10 (b), W represents a weld.

  As shown in FIG. 9, when the sleeve 21 is inserted into the opening 2 of the web 1a to be reinforced, the inner diameter of the sleeve 21 becomes an opening diameter necessary for piping and wiring. The diameter of the opening 2 formed in the web 1a needs to be increased so that the sleeve 21 can be inserted, the sleeve 21 having a large inner diameter needs to be used, and the opening for passing a sewage pipe or the like. In the case of 2, the diameter of the opening 2 needs to be further increased and the sleeve 21 having a larger inner diameter is required in order to attach the sleeve 21 so that the water gradient can be taken. However, since the length of the sleeve 21 is almost as long as the width of the flange 1b of the beam 1 as can be seen from FIG. 9B, if the diameter of the opening 2 is large and the diameter of the sleeve 21 is large. ,Three When welding the outer peripheral edge of the sleeve 21, the upper and lower sides of the sleeve 21 may interfere with the flange 1b of the beam 1 and may not be welded. In the case of the sleeve 21, since it is necessary to weld from both sides of the web 1a, the construction cost is very high.

  As shown in FIG. 10, when the ring-shaped plate 31 is welded to the periphery of the opening of the web 1a, the force is transmitted sufficiently to exert the reinforcing effect unless the inner peripheral edge and the outer peripheral edge of the ring-shaped plate 31 are welded. Therefore, the welding length becomes long, and it takes time for welding work. When the outer peripheral edge is welded, the upper and lower sides of the sleeve 21 are likely to interfere with the flange 1b of the beam 1 and welding becomes very difficult. In some cases, welding is not possible.

  In view of the above-mentioned problems, the present invention can perform welding work easily and easily, improve productivity and keep the construction cost low, and in particular, the diameter of the beam opening is considerably large with respect to the width of the web. Another object of the present invention is to provide a beam opening reinforcing structure that is effective when the width of the web portion between the flange and the beam opening is narrow.

  Means for solving the above problems will be described with reference numerals in the embodiments described later. The invention according to claim 1 is provided in the web 1a of the beam 1 made of H-shaped steel or I-shaped steel. A beam in which a through-groove 5 for welding is continuously formed in the circumferential direction, leaving at least one non-groove portion 6 in a ring-shaped main body 4 having substantially the same shape and the same inner diameter as the opening 2. Reinforcing rings 3 and 23 are brought into contact with one or both sides of the web 1a so that the inner peripheral edge 4a of the ring-shaped body 4 and the inner peripheral edge 2a of the beam opening 2 substantially coincide with each other. , 23 are welded and fixed to the web 1a from the through groove 5, and the ring-shaped main body 4 of the beam reinforcing rings 3 and 23 has an outer peripheral portion connected to the web 1a of the beam. Fillet so that it does not hit the fillet F between the flange 1b. The ring width of the portion adjacent to preparative F and characterized by being narrower than other parts.

  The invention according to claim 2 is for welding to a ring-shaped main body 4 having substantially the same shape and the same inner diameter as the opening 2 provided in the web 1a of the beam 1 made of H-shaped steel or I-shaped steel. The beam reinforcing rings 13 and 33 in which the through-grooves 5 are continuously formed in the circumferential direction leaving at least one non-groove 6 are used as the inner peripheral edge 4a of the ring-shaped body 4 and the inner peripheral edge 2a of the beam opening 2. And a beam opening reinforcement structure in which the beam reinforcing rings 13 and 33 are welded and fixed to the web 1a from the through groove 5 so that they are in contact with one side or both sides of the web 1a so as to substantially coincide with each other. The beam reinforcing rings 13 and 33 have a ring-shaped main body 4 at least an inner side surface portion of the outer peripheral portion facing the fillet F so that the outer peripheral portion does not hit the fillet F between the web 1a and the flange 1b of the beam 1. Is formed in the shape of a slope or a rounded surface And said that you are.

  In claims 1 and 2, “the inner periphery of the ring-shaped main body 4 is substantially the same shape and the same diameter as the opening 2 of the beam 1” means that the inner periphery of the ring-shaped main body 4 is the beam opening 2. This means that the shape and the diameter thereof are not completely the same and may be slightly different from each other. The phrase “so that the inner peripheral edge 4a of the ring-shaped body 4 and the inner peripheral edge 2a of the opening 2 substantially match” means that the inner peripheral edge 4a of the ring-shaped main body 4 and the inner peripheral edge 2a of the opening 2 are This means that even if they do not completely match, it is only necessary that both match. However, it is necessary to prevent the inner peripheral edge 4 a of the ring-shaped body 4 from protruding inward from the inner peripheral edge 2 a of the opening 2. Further, the outer peripheral portion of the ring-shaped main body 4 is prevented from coming into contact with the fillet F between the web 1a and the flange 1b of the beam when the outer peripheral portion of the ring-shaped main body 4 comes into contact with the fillet F. 4 is lifted, and a gap is formed between the web 1a and the beam reinforcing rings 3, 13, 23, 33 cannot be properly attached to the web 1a of the beam 1.

  A third aspect of the present invention is the beam opening portion reinforcing structure according to the first aspect, wherein the beam reinforcing rings 3 and 23 are provided with a non-groove portion 6 in a portion where the ring width of the ring body 4 is narrowed. To do.

  Claim 4 is the beam opening portion reinforcing structure according to claim 2, wherein the beam reinforcing rings 13 and 33 are non-grooved portions at the inner surface portion of the outer peripheral portion of the ring main body 4 formed in a slope shape or a rounded surface shape. 6 is provided.

  Claim 5 is the beam opening portion reinforcing structure according to any one of claims 1 to 4, wherein the beam reinforcing rings 3 to 33 are made of a cast steel product for welded structure, formed of a steel plate, or by forging. It is formed.

  Claim 6 is the beam opening portion reinforcing structure according to any one of claims 1 to 5, wherein the through groove 5 formed in the ring-shaped main body 4 of the beam reinforcing rings 3 to 33 has an inclined inner surface or It is formed in a rounded surface shape.

  In the beam opening portion reinforcing structure according to any one of claims 1 to 6, the non-groove portion 6 formed in the ring-shaped main body 4 of the beam reinforcing rings 3 to 33 is in contact with the web 1a. The surface opposite to the side is formed in a mountain-shaped cross section so as to be inclined downward from the circumferential intermediate portion to both ends thereof.

  The effects of the invention by the above solution will be described with reference numerals in the embodiments described later. According to the invention according to claim 1, the openings 2 and 12 of the beam 1 have substantially the same shape and the same diameter. A beam reinforcing ring 3, 23 in which a welding through groove 5 is continuously formed in the circumferential direction leaving a non-groove portion 6 in a ring-shaped main body 4 having an inner periphery of the ring-shaped main body 4 and an inner peripheral edge 4 a of the ring-shaped main body 4 and a beam. The beam reinforcing rings 3 and 23 are welded to the beam 1 from the through groove 5 by abutting against one side or both sides of the web 1a so that the inner peripheral edge 2a of the openings 2 and 12 substantially match. In order to weld the beam reinforcing rings 3 and 23 to the web 1a, it is only necessary to perform welding along the through groove 5. Therefore, the flange of the beam 1 as in the conventional beam opening reinforcing structure is used. When welding around 1b, there is no interference with the flange 1b, and the opening 2 can be welded almost completely, and a sufficient reinforcement effect can be obtained by the beam reinforcement rings 3 and 23, thereby exhibiting the same or better performance as the conventional beam opening reinforcement structure. However, the welding operation is easy and the application of automatic welding by a robot becomes easy, so that the efficiency of the welding operation can be improved.

  In the present invention, the ring-shaped main body 4 of the beam reinforcing ring 3 has other ring widths adjacent to the fillet F so that the outer peripheral portion does not hit the fillet F between the web 1a and the flange 1b of the beam. Therefore, in manufacturing the beam reinforcing rings 3 and 23, the ring-shaped main body 4 can be formed broadly as a whole, so that the beam openings 2 and 12 are considerably larger than the width of the web 1a. Even if it is formed, the contact area of the beam reinforcing ring 3 with the web 1a can be widened, the reinforcing strength can be increased, and the width of the through groove 5 can be made sufficiently wide to facilitate welding. And the quality of the welded portion can be ensured.

  Incidentally, if the ring width of the ring-shaped main body 4 is uniform in the circumferential direction, if the diameter of the beam opening is considerably larger than the width of the web 1a, the flange 1b and the beam opening Since the width of the web portion in between is reduced and the peripheral portion of the ring-shaped main body 4 needs to be prevented from interfering with the fillet, the ring width dimension of the ring-shaped main body 4 must be reduced. The contact area of the beam reinforcing ring 3 with the web 1a is inevitably narrowed, and the width of the through groove 5 cannot be taken sufficiently, so that welding work becomes difficult and a sufficient reinforcing effect cannot be obtained.

  The beam reinforcing rings 3 and 23 are attached to one side or both sides of the web 1a. However, when the beam reinforcing rings 3 and 23 are attached only to one side of the web 1a, if the plate thickness of the ring-shaped main body 4 is too thick, the shear center position of the beam 1 is set. Since it is eccentric to one side (ring attachment surface side) of the web 1a, a couple is generated with respect to the vertical load to the beam 1, which is not preferable. Therefore, when the beam reinforcing rings 3 and 23 are attached only to one side of the web 1a, it is necessary to reduce the plate thickness of the ring-shaped main body 4 as much as possible. In this case, the beam reinforcing rings 3 and 23 can form the ring-shaped main body 4 broadly as a whole except for the portion adjacent to the fillet F. Therefore, even if the plate thickness of the ring-shaped main body 4 is reduced, the ring width is reduced. By forming it widely, the contact area of the beam reinforcing ring 3 with respect to the web 1a can be widened, and the reinforcing strength can be sufficiently increased. Further, when the beam reinforcing rings 3 and 23 are attached to only one side of the web 1a, the welding work can be easily performed by tilting the beam 1 so that the one side of the web 1a faces upward and performing downward welding. Therefore, even if it is not an expert engineer, sufficient favorable welding is attained, and since it is not necessary to repeat the beam 1, work becomes easy and easy.

  According to the invention according to claim 2, in addition to the effects common to the invention according to claim 1, the outer peripheral portion of the ring-shaped body 4 of the beam reinforcing rings 13 and 33 is formed between the web 1a and the flange 1b of the beam 1. By forming at least the inner side surface portion of the outer peripheral portion facing the fillet F in a slanted or rounded shape so as not to hit the fillet F between them, the ring width of the ring-shaped main body 4 can be widened as a whole. This facilitates welding and ensures the quality of the welded portion. Further, when the beam reinforcing rings 13 and 33 are attached only to one side of the web 1a, the reinforcing strength can be sufficiently increased while the plate thickness of the ring-shaped main body 4 can be made as thin as possible.

  According to the invention of claim 3, by providing the non-groove portion 6 in the portion of the ring body 4 where the ring width is narrowed, the strength reduction of the ring portion where the ring width is narrowed can be sufficiently compensated.

  According to the invention which concerns on Claim 4, by providing the non-groove part 6 in the site | part in which the inner surface part of the ring body 4 outer peripheral part is formed in the shape of a slope or a round surface, the inner side surface part becomes a slope shape or a round surface shape. The strength reduction of the formed ring portion can be sufficiently compensated.

  According to the fifth aspect of the present invention, the beam reinforcing rings 3 to 33 may be made of a cast steel product for welded structure, may be formed of a steel plate, or may be formed by forging.

  If the inner side surface portion of the through groove 5 is formed in a round shape or a tapered shape as in the invention according to claim 6, the through groove is narrower than the case where the inner side surface portion of the through groove 5 is not formed in a round shape or a tapered shape. The weldability in the groove 5 can be improved, and the effect can be increased in ensuring quality.

  As in the invention according to claim 7, the non-grooved portion 6 of the beam reinforcing ring 3 has a mountain-shaped cross section in which the surface opposite to the side abutting on the beam 1 is inclined downward from the circumferential intermediate portion to both ends thereof. When the beam reinforcing ring 3 is welded to the beam, it is possible to prevent the occurrence of a puddle of coating liquid in the through groove 5 when performing electrodeposition coating for anticorrosive treatment or dob-dipping plating.

  A preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 1 (a) is a front view showing a beam opening reinforcing structure according to the present invention, and (b) is an XX line of (a). 2A is a front view showing an opening formed in the beam 1, FIG. 2B is a sectional view taken along the line YY of FIG. 3A, and FIG. The front view which shows a reinforcement ring, (b) is the VV sectional view taken on the line of (a), (c) is the expanded sectional view on the W-W line of (a). In these drawings, reference numeral 1 denotes an H-shaped steel as a steel beam, which consists of a web 1a and upper and lower flanges 1b and 1b. The web 1a has a diameter D as shown in FIGS. 2 (a) and 2 (b). A circular opening 2 is formed, and a rounded fillet F is formed between the web and the flange. 3 is a beam reinforcement ring.

  The beam reinforcement ring 3 is a cast steel product for welded structure comprising a ring-shaped main body 4 having the same circular shape as the circular opening 2 formed in the web 1 a of the beam 1 and the same inner diameter as the opening 2. As shown in FIGS. 3 (a) and 3 (b), the ring-shaped body 4 has welding through-grooves 5 around the non-groove portions 6 and 6 at both ends in the diameter direction. It is formed continuously in the direction. The types of cast steel products for welded structures include SCW410, SCW450, SCW480, SCW550, and SCW620. Among these, for example, SCW480 has C of 0.22% or less, Si of 0.60% or less, Mn of 1.50% or less, P Is 0.04% or less, S is 0.04% or less, Ni is 0.50% or less, Cr is 0.50% or less, and the carbon equivalent is 0.45% or less.

  As shown in FIG. 1, the ring-shaped main body 4 of the beam reinforcing ring 3 is arranged so that its outer peripheral portion does not hit the fillet F between the web 1a and the flange 1b of the beam 1 (ring-shaped main body 4). ) Hits the fillet F, a gap is formed between the ring-shaped main body 4 and the web 1a so that the beam reinforcing ring 3 cannot be properly attached to the web 1a), and the ring width of the portion 4o adjacent to the fillet F Are formed narrower than the other portions, and the portions other than the portion 4o are formed to have a uniform ring width. That is, in this case, the ring-shaped main body 4 seems to be cut out narrowly so that the outer peripheral portion 4o adjacent to the fillet F does not hit the fillet F from the ring-shaped main body 4 formed with a uniform ring width over the entire circumference. It is a simple shape.

  In this case, the portion 4o adjacent to the fillet F having a narrow ring width is formed so as to be located slightly below the base portion h of the upper fillet F as shown in FIG. Although not shown, the lower fillet F is formed so that a portion 4o having a narrow ring width is located slightly above the base.

  As shown in FIG. 5 (a), the welding through groove 5 is preferably formed so that its inner side surface has an inclined surface, and the inclined surface portion is indicated by 5t. In this way, the inner side surface portion may be formed in a slope shape, or the opening end portion side of the inner side surface portion may be formed in a round shape as shown in FIG. Indicated by 5r. In this way, if the inner side surface portion of the through groove 5 is formed in a slope shape or a round shape, welding in the through groove 5 is facilitated as compared to a case where the inner side surface portion is not formed in a slope shape or a round shape. When the beam reinforcing ring 3 is made of a cast steel product for welded structure, it is very easy and easy to form the inclined surface portion 5t or the rounded portion 5r on the inner side surface portion of the through groove 5.

  The non-grooved portion 6 formed in the ring-shaped main body 4 of the beam reinforcing ring 3 is a surface opposite to the side of the beam 1 that is in contact with the web 1a, as can be seen from FIGS. 3 (a) and 3 (d). Is formed in a cross-sectional mountain shape (see FIG. 3D) so as to be inclined downward from the circumferential intermediate portion to both ends thereof. By forming the non-grooved portion 6 in a mountain shape in this way, after the beam reinforcing ring 3 is welded to the beam 1, a pool of coating liquid is accumulated in the through-groove 5 when electrodeposition coating or anti-corrosion plating is performed for rust prevention treatment. Can be prevented.

  The non-groove portion 6 is formed at a position approximately 90 ° apart in the circumferential direction from the portion 4o where the ring width of the ring-shaped main body 4 is narrowed, as shown by a solid line in FIG. However, it is preferable to provide the non-groove portion 6 in a portion where the ring width of the ring main body 4 is narrowed, as shown by the phantom line in FIG. 3A, so that the ring width is narrowed. It is possible to sufficiently compensate for the strength reduction of the ring portion.

  In order to reinforce the opening 2 of the web 1a of the beam 1 using the beam reinforcing ring 3 as described above, the beam reinforcing ring 3 is attached to the ring 1 as shown in FIGS. 1 (a) and (b). Each beam reinforcing ring 3 is brought into contact with the both sides of the web 1a so that the inner peripheral edge 4a of the main body 4 and the inner peripheral edge 2a of the opening 2 of the web 1a are aligned with each other from the through groove 5 to the web. By welding to 1a, the beam reinforcing ring 3 is fixed to the web 1a to form a beam opening reinforcing structure as shown.

  In this case, welding is performed, for example, by semi-automatic or automatic welding, from one end portion of the through groove 5 to the left and right direction intersecting the longitudinal direction of the groove, that is, while weaving, to the other end portion along the through groove 5. Overlay welding is performed so that the through groove 5 is filled with the weld bead Wb as shown in FIG.

  By welding the beam reinforcing ring 3 to the web 1a of the beam 1 so that the through groove 5 of the ring-shaped body 4 is filled with the weld bead Wb in this way, the through groove 5 of the beam reinforcing ring 3 is eliminated. Since the weld bead Wb and the ring-shaped main body 4 are continuously raised or have a substantially uniform cross section, the reinforcing effect of the beam opening 2 is improved.

  Further, when welding the beam reinforcing ring 3, if the H-shaped steel which is the beam 1 is tilted so that the side surface of the web 1a faces up and down, and the one-side side of the web 1a is welded downward, welding is performed. The work is facilitated, and sufficiently good welding is possible even without a skilled engineer. In particular, this welding may be performed along the through groove 5 continuously formed in the circumferential direction of the ring-shaped main body 4, and therefore, when welding the vicinity of the flange 1 b of the beam 1 made of H-shaped steel or I-shaped steel. The peripheral portion of the opening 2 can be completely welded without being interfered by the flange 1b, and a sufficient reinforcing effect by the beam reinforcing ring 3 can be obtained, whereby the conventional ring shape shown in FIG. Welding operation of beam reinforcement ring 3 is possible because it can perform the same or better performance than the beam opening reinforcement structure with a plate, but can be easily welded and can be automatically applied by robot. Work efficiency can be improved significantly. In addition, when the beam reinforcing ring 3 is a cast steel product for welded structure, its manufacturing cost is significantly lower than that of a steel plate beam reinforcing ring, which greatly increases the construction cost of the beam opening reinforcing structure. Reduction can be achieved.

  Further, the ring-shaped main body 4 of the beam reinforcing ring 3 has a ring width of a portion 4o adjacent to the fillet F so that the outer peripheral portion does not hit the fillet F between the web 1a and the flange 1b of the beam. When the beam reinforcing ring 3 is manufactured, the ring-shaped main body 4 can be widely formed as a whole, so that the beam opening 2 is formed as large as possible with respect to the width of the web 1a. However, the contact area of the beam reinforcing ring 3 to the web 1a can be widened to increase the reinforcing strength, and the width of the through groove 5 can be widened to facilitate welding. Enough strength is secured.

  In addition, as in the beam opening portion reinforcing structure of the embodiment shown in FIG. 1, when the beam reinforcing ring 3 is welded while being brought into contact with both sides of the beam 1, welding is performed only on one side of the beam 1. In comparison, the thickness of the beam reinforcing ring 3 can be reduced, so that welding between the beam reinforcing ring 3 and the beam 1 can be reduced, and both beam reinforcing rings 3 and 3 are provided on both sides of the beam opening 2. Since the balance of the beam 1 is balanced, the shear center position of the beam 1 is not shifted, no couple is generated with respect to the vertical load on the beam 1, and the periphery of the beam opening 2 is distorted or deformed. There is no. When the beam reinforcing ring 3 is attached only to one side of the web 1a, if the plate thickness of the ring-shaped main body 4 is too thick, the shear center position of the beam 1 is eccentric to one side (ring attaching surface side) of the web 1a. For this reason, a couple of forces is generated with respect to the vertical load on the beam 1. Therefore, when the beam reinforcing ring 3 is attached only to one surface of the web 1 a, it is necessary to reduce the plate thickness of the ring-shaped main body 4 as much as possible. In this case, the beam reinforcing ring 3 can form the ring-shaped main body 4 as a whole with the exception of the portion adjacent to the fillet F. Therefore, even if the plate thickness of the ring-shaped main body 4 is made thin, the ring width is wide. By doing so, the contact area of the beam reinforcing ring 3 with respect to the web 1a can be widened, and the reinforcing strength can be sufficiently increased.

  Further, in the beam opening reinforcing structure of the embodiment shown in FIG. 1, as a beam reinforcing ring 3 that reinforces the circular opening 2 of the beam 1, the ring-shaped main body 4 has two through grooves 5 at both ends in the diameter direction. The non-groove portions 6 and 6 are continuously formed in the circumferential direction, but the through-groove 5 is continuously formed in the ring-shaped body 4 with the non-groove portion 6 left. Alternatively, a ring-shaped main body 4 in which through grooves 5 are formed leaving two or more non-groove portions 6 may be used.

  However, from the viewpoint of accuracy, quality, etc. of the beam reinforcing ring 3, deformation such as torsion is difficult to occur during manufacturing of the beam reinforcing ring 3, so that the through groove 5 leaves at least two non-grooved portions 6 in the ring-shaped body 4. From the viewpoint of reinforcing effect, welding efficiency, automation, etc., the welded portion should be as long as possible and continuous, so that the through groove 5 has one or two non-grooved portions. 6 is preferably formed continuously in the circumferential direction on the ring-shaped main body 4.

  4A is a front view showing another beam opening reinforcing structure according to the present invention, and FIG. 4B is a sectional view taken along the line ZZ of FIG. 4A. That is, the beam opening reinforcing structure described with reference to FIGS. 1A and 1B is adjacent to the fillet F so that the outer periphery of the ring-shaped body 4 of the beam reinforcing ring 13 does not hit the fillet F of the beam 1. The outer peripheral portion 4o is cut off and the ring width of the portion adjacent to the fillet F is made narrower than the other portions. In the beam opening reinforcing structure of FIG. The inner side surface portion 4s of the outer peripheral portion of the ring-shaped main body 4 facing the fillet F is formed in a slope shape or a round shape so that the side surface does not hit the fillet F of the beam 1. Further, as shown by the solid line in FIG. 4A, the non-groove portion 6 is spaced approximately 90 ° in the circumferential direction from the portion 4s where the inner side surface portion 4s of the outer periphery of the ring-shaped main body 4 is formed in a slope shape or a round shape. Although it is formed at the position, preferably, as shown by the phantom line in FIG. 4 (a), the non-grooved portion is formed in the portion where the inner side surface portion of the outer peripheral portion of the ring main body 4 is formed in a slope shape or a round surface shape. 6 can be provided, and by doing so, it is possible to sufficiently compensate for the strength reduction of the ring portion in which the inner side surface portion is formed in the shape of a slope or a rounded surface.

  FIG. 6 (a) is an enlarged view of the structure portion in which the inner side surface of the outer peripheral portion of the ring-shaped body 4 facing the fillet F of the beam 1 is formed in a slope shape (the slope-like portion is indicated by 4s). The inclined surface portion 4s of the outer periphery of the cylindrical body 4 has a gap between the fillet F, and the inner edge of the inclined surface portion 4s is located slightly below the base portion h of the upper fillet F. Formed. Although not shown, the lower fillet F is formed so that the inner edge of the sloped portion 4s is located slightly above the base.

  In the embodiment shown in FIG. 4, the inner side surface portion 4 s of the outer peripheral portion of the ring-shaped main body 4 facing the fillet F is formed in a slope shape, but the inner side surface portion 4 s may be formed in a round shape. In the case of forming a round shape, the rounded surface has a curvature smaller than the curvature of the fillet F. Further, in the embodiment of FIG. 4, as shown in (a), only the inner side surface portion of the outer peripheral portion facing the fillet F is formed in a slope shape (or round shape), but the outer peripheral portion of the ring-shaped main body 4 The inner side surface portion of the ring-shaped body 4 may be formed in a slope shape (or a round shape) over the entire circumference of the ring-shaped main body 4.

  Thus, at least the inner side surface of the outer peripheral portion of the ring-shaped main body 4 facing the fillet F is inclined so that the inner side surface of the outer peripheral portion of the ring-shaped main body 4 of the beam reinforcing ring 3 does not contact the fillet F of the beam 1. Alternatively, when the beam reinforcing ring 3 is formed, the ring-shaped main body 4 can be formed widely over the entire circumference by forming it in a rounded surface shape, so that the beam opening 2 is considerably larger than the width of the web 1a. Even if formed, the contact area of the beam reinforcing ring 3 with respect to the web 1a can be made as wide as possible to increase the reinforcing strength, and the width of the through groove 5 can be sufficiently increased, so that welding can be performed. And the strength of the welded portion is sufficiently secured.

  As indicated by phantom lines in FIG. 5 (a), by forming a groove K for welding at the lower part of the inner side surface of the through groove 5, the penetration of welding is increased and the welding strength is further increased. It becomes good.

  5 (b) and 6 (b) show still another embodiment. For example, the beam reinforcing rings 3 and 13 for reinforcing the circular opening 2 of the beam 1 made of a large H-shaped steel are shown. When the groove width of the through groove 5 is wide and the groove depth is deep, the through groove 5 is filled with the weld bead Wb as shown in FIG. 5 (a) and FIG. 6 (a). Without welding, welding can be performed more efficiently by welding along the inner peripheral edge of the through groove 5 of the beam reinforcing rings 3 and 13 as shown in FIG. 5 (b) and FIG. 6 (b). However, a sufficient reinforcing effect can be secured.

  (A) of FIG. 7 shows the beam opening part reinforcement structure by other embodiment, (a) is a front view, (b) is the QQ sectional view taken on the line of (a). The ring-shaped main body 4 of the beam reinforcing ring 23 in this beam opening reinforcing structure has an elliptical inner peripheral shape, an outer peripheral shape that is elliptical, and a ring width adjacent to the fillet F that has the smallest ring width. However, the ring width gradually increases from the short diameter portion to the elliptical long diameter portion, and the ring width of the long diameter portion is formed to be the largest. The beam reinforcing ring 23 can be easily and easily manufactured by casting with a cast steel for welded structure.

  Further, as can be understood from FIG. 7A, the ring-shaped main body 4 of the beam reinforcing ring 23 is formed in an elliptical short-diameter portion so that the non-groove portion 6 is located on the side adjacent to the fillet F. The through groove 5 is formed so that the groove width is widest at the elliptical long diameter portion and the width is narrowest at the short diameter portions at both ends. The welding method of the beam reinforcing ring 23 in the through groove 5 is the same as that of the beam reinforcing rings 3 and 13 shown in FIGS.

  According to the beam opening reinforcing structure using such a beam reinforcing ring 23, the beam opening 2 is formed to be as large as possible with respect to the width of the web 1a, similarly to the beam opening reinforcing structure of FIG. Even in this case, the contact area of the beam reinforcing ring 3 with respect to the web 1a can be widened, the reinforcing strength can be sufficiently increased, and the through groove 5 can be sufficiently wide as a whole, so that welding is facilitated. The strength of the welded portion can be sufficiently secured.

  Moreover, in this beam opening portion reinforcement structure, the non-groove portion 6 of the ring-shaped main body 4 is provided in a portion where the ring width is narrowed, and the beam reinforcement ring 23 is positioned so that the non-groove portion 6 is located on the side adjacent to the fillet F. Is welded to the web 1a and fixed, and the through groove 5 is not interposed in the narrow portion, so that the strength reduction of the narrow portion can be sufficiently compensated. In addition, the through groove 5 of the beam reinforcing ring 23 is also formed in an inclined surface or a rounded surface as shown in FIGS. 5 (a) and 5 (b) and FIG. 6 (a) and (b). It is desirable to do.

  8A and 8B show the beam opening reinforcement structure when the opening 2 formed in the beam 1 is a quadrangle. FIG. 8A is a front view, and FIG. 8B is a cross-sectional view taken along the line RR in FIG. is there. The beam reinforcing ring 33 used in the beam opening reinforcing structure has the same shape as the rectangular opening 12 formed in the web 1a of the beam 1 made of H-shaped steel and has the same diameter as the rectangular opening 12. It consists of a rectangular ring-shaped main body 4 made of a steel plate having a circumference. In this rectangular ring-shaped main body 4, as shown in FIG. Non-groove portions 6 are formed between adjacent end portions of the vertical and horizontal through grooves 5 and 5 and the left and right vertical through grooves 5 and 5, The inner side surfaces of the upper and lower sides of the outer peripheral portion facing the fillet F are formed in a slope shape (or a rounded surface shape) so that the outer peripheral portion does not hit the fillet F of the beam 1. 4s. 4s (or rounded surface portion) of the inclined surface portion can be formed not only on the upper and lower sides of the outer peripheral portion but also on the left and right sides. Further, each non-groove portion 6 is located on the side adjacent to the fillet F.

  As shown in FIGS. 5A and 5B and FIGS. 6A and 6B, the through groove 5 of the beam reinforcing ring 33 is also formed with an inclined side surface or a rounded surface. Is desirable.

  In the beam opening reinforcing structure of the embodiment described above, the beam reinforcing rings 3, 13, 23, and 33 brought into contact with the web 1a of the beam 1 are fixed to the web 1a by welding only inside the through groove 5. When the welding only inside the through groove 5 is insufficient, the fillet welding can be performed along the outer peripheral edge of the ring-shaped main body 4 together with the welding inside the through groove 5. By adding welding along the outer peripheral edge of the ring-shaped main body 4 in this way, the reinforcing effect of the beam opening 2 by the beam reinforcing rings 3, 13, 23, 33 can be enhanced.

  Moreover, in the above embodiment, the beam reinforcing rings 3 to 33 are made of a cast steel product made of cast steel for welded structure, but are not limited to such a cast steel product, and may be formed of a steel plate, Alternatively, it can be formed by forging. However, if it is manufactured as a cast steel product with welded structural cast steel, there is little material loss, mass production is possible, the manufacturing cost can be significantly reduced, and the quality is improved.

(a) is a front view which shows the beam opening part reinforcement structure which concerns on this invention, (b) is XX sectional drawing of (a). (a) is a front view which shows the opening part formed in the beam, (b) is the YY sectional view taken on the line of (a). (a) is a front view showing a beam reinforcing ring, (b) is a sectional view taken along line ZZ of (a), and (c) is an enlarged sectional view taken along line U-U of (a). (a) is a front view showing another beam opening reinforcing structure according to the present invention, and (b) is a sectional view taken along line ZZ of (a). (a) And (b) is an expanded sectional view which shows another beam opening part reinforcement structure. (a) And (b) is an expanded sectional view which shows another beam opening part reinforcement structure. The beam opening part reinforcement structure by other embodiment is shown, (a) is a front view, (b) is the QQ sectional view taken on the line of (a). (a) is a front view showing a beam opening reinforcement structure when the beam opening is a quadrangle, and (b) is a cross-sectional view taken along line RR of (a). (a) is a front view showing a conventional beam opening reinforcement structure, and (b) is a cross-sectional view taken along the line II in (a). (a) is a front view showing another conventional beam opening reinforcement structure, and (b) is a cross-sectional view of the roll line of (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Beam 1a Beam web 1b Beam flange F Beam fillet 2 Beam opening 3 Beam reinforcement ring 4 Ring-shaped main body 5 Through groove 6 Non-groove Wb Weld bead 13 Beam reinforcement ring 23 Beam reinforcement ring 33 Beam reinforcement ring

Claims (7)

  A ring-shaped body having an inner circumference with substantially the same shape and diameter as the opening provided on the web of the beam made of H-shaped steel or I-shaped steel leaves at least one non-grooved groove for welding. The beam reinforcing ring formed continuously in the circumferential direction is brought into contact with one or both sides of the web so that the inner peripheral edge of the ring-shaped body and the inner peripheral edge of the beam opening substantially coincide with each other. A beam opening reinforcement structure in which a beam reinforcement ring is welded and fixed to a web from a through groove, and the ring-shaped main body of the beam reinforcement ring has a fillet between the web of the beam and the flange. A beam opening reinforcement structure in which the ring width of the part adjacent to the fillet is narrower than other parts so that it does not hit.   A ring-shaped body having an inner circumference with substantially the same shape and diameter as the opening provided on the web of the beam made of H-shaped steel or I-shaped steel leaves at least one non-grooved groove for welding. The beam reinforcing ring formed continuously in the circumferential direction is brought into contact with one or both sides of the web so that the inner peripheral edge of the ring-shaped body and the inner peripheral edge of the beam opening substantially coincide with each other. A beam opening reinforcement structure in which a beam reinforcement ring is welded and fixed to a web from a through groove, and the ring-shaped main body of the beam reinforcement ring has a fillet between the web of the beam and the flange. A beam opening reinforcing structure in which at least the inner side surface portion of the outer peripheral portion facing the fillet is formed in a slope shape or a rounded surface shape so as not to hit.   The beam opening reinforcing structure according to claim 1, wherein the beam reinforcing ring is provided with a non-groove portion in a portion where the ring width of the ring main body is narrowed.   3. The beam opening reinforcing structure according to claim 2, wherein the beam reinforcing ring is provided with a non-groove portion at a portion where the inner side surface of the outer peripheral portion of the ring main body is formed in a slope shape or a rounded shape.   The beam opening reinforcing structure according to any one of claims 1 to 4, wherein the beam reinforcing ring is made of a cast steel product for welded structure, is formed of a steel plate, or is formed by forging.   The beam opening portion reinforcing structure according to any one of claims 1 to 5, wherein an inner side surface portion of the through groove formed in the ring-shaped main body of the beam reinforcing ring is formed in a slope shape or a rounded surface shape. The non-grooved portion formed in the ring-shaped main body of the beam reinforcing ring is formed in a cross-sectional mountain shape such that the surface opposite to the side abutting on the web is inclined downward from the circumferential intermediate portion to both ends thereof. The beam opening reinforcement structure according to any one of claims 1 to 6.

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