JP2006214185A - Beam opening reinforcement structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a beam opening reinforcement structure, in which weld work can be simply and easily carried out, and construction cost can be restricted. <P>SOLUTION: To a circular main body 4 having the same form and the same diameter of an inner circumference with an opening 2 of a beam 1, a beam reinforcement ring 3 comprising cast steel for a weld structure in which a through groove 5 for welding is continuously formed along the circumference, except for a non-groove part 6, is abutted on one surface side or both surface sides of the beam 1 in such a way that an inner circumferential edge 4a of the circular main body 4 is corresponded to an inner circumferential edge 2a of the opening 2. The beam reinforcement ring 3 is fixedly welded with the beam 1 from the through groove 5. <P>COPYRIGHT: (C)2006,JPO&NCIPI

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, I-beams, etc. 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 a conventional beam opening reinforcing means, as shown in FIGS. 6A and 6B, 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 sides of the web 1a and the outer peripheral surface of the sleeve 21 by fillet welding, or (a) of FIG.
, (B), the plate 31 formed in a ring shape 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 this ring shape, respectively. There is a way to reinforce it. In FIGS. 6 (a) and 6 (b) and FIGS. 7 (a) and 7 (b), W represents a welded portion.

  As shown in FIG. 6, when the sleeve 21 is inserted and reinforced in the opening 2 of the web 1a, the inner diameter of the sleeve 21 becomes the 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. 6 (b), 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. 7, 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. Since the welding length is long, it takes time for welding work, and when welding the outer peripheral edge, the upper and lower sides of the sleeve 21 easily interfere with the flange 1b of the beam 1, making welding very difficult. In some cases, welding is not possible.

  In view of the above-described problems, the present invention eliminates the need to form an unnecessarily large beam opening, makes welding work easy and easy, improves productivity, and keeps construction costs low. It is another object of the present invention to provide a beam opening reinforcing structure.

  Means for solving the above problems will be described with reference numerals in the embodiments described later. The beam opening reinforcing structure of the invention according to claim 1 has substantially the same shape as the opening 2 of the beam 1. A beam-reinforcing ring 3 made of cast steel for welded structure in which a through groove 5 for welding is continuously formed in the circumferential direction leaving at least one non-groove 6 in a ring-shaped main body 4 having an inner circumference of the same diameter. Is brought into contact with one or both sides of the beam 1 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. It is characterized by being welded and fixed to the beam 1 from 5.

  Here, “the inner circumference 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 circumference of the ring-shaped main body 4 is the shape of the beam opening 2 and its diameter. It means that each of them is not completely identical and may be slightly different. 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.

  The second aspect of the present invention is the beam opening reinforcing structure according to the first aspect, wherein the non-grooved portion 6 formed in the ring-shaped main body 4 of the beam reinforcing ring 3 has a surface opposite to the side in contact with the beam 1. It is characterized in that it is formed in a cross-sectional mountain shape that is downwardly inclined from the circumferential intermediate portion to both ends thereof.

  According to a third aspect of the present invention, in the beam opening reinforcing structure according to the first or second aspect, the inner surface of the through groove 5 formed in the ring-shaped body 4 of the beam reinforcing ring 3 is formed in a round shape or a tapered shape. It is characterized by.

  A fourth aspect of the present invention is the beam opening reinforcing structure according to any one of the first to third aspects, wherein the beam reinforcing ring 3 is welded and fixed to the beam 1 so that the through groove 5 is filled with the weld bead Wb. It is characterized by becoming.

  A fifth aspect of the present invention is the beam opening reinforcing structure according to the first aspect, wherein the beam reinforcing ring 3 is welded along the inner peripheral edge of the through groove 5 and fixed to the beam 1.

  Claim 6 is the beam opening reinforcing structure according to any one of claims 1 to 5, wherein the beam reinforcing ring 3 is welded to the beam 1 from the through groove 5 and the outer peripheral edge of the ring-shaped main body 4 It is welded along and fixed to the beam 1.

  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, 13 made of cast steel for welded structure in which a through-groove 5 for welding is continuously formed in the circumferential direction leaving at least one non-grooved portion 6 in the ring-shaped body 4 having an inner periphery of The beam reinforcing rings 3 and 13 are penetrated by abutting against one side or both sides of the beam 1 so that the inner peripheral edge 4a of the ring-shaped body 4 and the inner peripheral edge 2a of the openings 2 and 12 substantially coincide with each other. Since it is a structure formed by welding to the beam 1 from the groove 5, and welding may be performed along the through groove 5, when welding the vicinity of the flange 1 b of the beam 1 made of H-shaped steel or I-shaped steel. There is no interference with the flange 1b, and the peripheral portions of the openings 2 and 12 are completely melted. Thus, a sufficient reinforcing effect can be obtained by the beam reinforcing rings 3 and 13, thereby enabling the welding operation while exhibiting the same or higher performance as the beam opening reinforcing structure by the conventional ring-shaped plate. Therefore, it is easy to apply automatic welding by a robot, and the efficiency of welding work can be improved. In particular, in the present invention, since the beam reinforcing rings 3 and 13 are cast steel products for welded structures, there is no material loss, mass production and quality can be improved, and the manufacturing cost is lower than that of a steel plate beam reinforcing ring. This is much cheaper, which can reduce the construction cost of the beam opening reinforcement structure.

  According to the second aspect of the present invention, the non-grooved portion 6 of the beam reinforcing ring 3 has a mountain-shaped cross section in which the surface on the opposite side to the side in contact with 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.

  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 3, 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.

  According to the invention of claim 4, when the beam reinforcing rings 3 and 13 are welded to the beam 1 so that the through grooves 5 are filled with the weld beads Wb, the through grooves 5 of the beam reinforcing rings 3 and 13 are formed. Since the weld bead Wb and the ring-shaped main body 4 are continuously raised or have a uniform cross section, the reinforcing cross section efficiency of the beam reinforcing rings 3 and 13 is improved, and the reinforcing effect of the beam openings 2 and 12 is improved. be able to.

  According to the fifth aspect of the invention, by performing fillet welding along the inner peripheral edge of the through groove 5 of the beam reinforcing rings 3 and 13, it is possible to efficiently perform the welding, but also to obtain a sufficient reinforcing effect. it can.

  According to the invention of claim 6, the beam reinforcing rings 3 and 13 are welded to the beam 1 from the through groove 5, and fillet welded along the outer peripheral edge of the ring-shaped main body 4 to be fixed to the beam 1. By doing so, the reinforcement effect of the beam opening part 2 by the beam reinforcement rings 3 and 13 can be heightened further.

  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 ZZ sectional view taken on the line of (a), (c) is the UU expanded sectional view of (a). In these figures, reference numeral 1 denotes an H-shaped steel as a steel beam, which comprises a web 1a and upper and lower flanges 1b and 1b. The web 1a has a circular shape as shown in FIGS. 2 (a) and 2 (b). An opening 2 is formed. 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. 3A and 3B, the ring-shaped body 4 has welding through-grooves 5 around the non-groove portions 6 and 2 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.

  The through-groove 5 is formed in a round shape on the opening end side of the inner side surface portion, and this round-shaped portion is indicated by 5r in FIG. 3 (b) and FIG. 5 (a). In this way, the opening end side of the inner side surface portion may be formed in a round shape, or the inner side surface portion of the through groove 5 may be formed in a tapered shape as shown in FIG. The tapered portion is indicated by 5t. In this way, if the inner side surface portion of the through groove 5 is formed in a round shape or a tapered shape, welding in the through groove 5 is facilitated as compared to a case where the inner surface portion is not formed in a round shape or a tapered shape. In addition, since the beam reinforcing ring 3 is made of a cast steel product for welded structure, it is very easy and easy to form the rounded portion 5r or the tapered portion 5t on the inner side surface portion of the through groove 5.

  As the beam 1 made of H-shaped steel, for example, an H-shaped steel of 200 mm (height) × 100 mm (width) × 5.5 mm (web 1a thickness t1) × 8 mm (flange 1b thickness) is used. Then, when the inner diameter D of the opening 2 formed in the web 1a is 125 mm, for example, the dimension of the beam reinforcing ring 3 that reinforces the opening 2 will be described. The inner diameter D of the opening 2 is 125 mm, the outer diameter D2 is 162 mm, the plate thickness t4 is 9 mm or 12 mm, and the groove width w5 of each through groove 5 is 8 mm.

  When the beam 1 is, for example, an H-shaped steel of 250 mm (height) × 125 mm (width) × 6.0 mm (thickness t1 of the web 1a) × 9 mm (thickness of the flange 1b), the web 1a For example, the dimension of the beam reinforcing ring 3 when the inner diameter D of the opening 2 formed at 150 is 150 mm is shown. The inner diameter D1 (= D) of the ring-shaped main body 4 is 150 mm, the outer diameter D2 is 208 mm, and the plate thickness t4. Is 12 mm or 16 mm, and the groove width w5 of the through groove 5 is 12 mm.

  Further, the non-groove portion 6 formed in the ring-shaped body 4 of the beam reinforcing ring 3 is 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 (c). Are formed in a cross-sectional mountain shape so as to be inclined downward from the circumferential intermediate portion to both ends thereof. Thus, the non-groove portion 6 is formed in a mountain-shaped cross section because the coating liquid is formed in the through groove 5 when the beam reinforcing ring 3 is cast and then the surface of the cast is subjected to electrodeposition coating or immersion plating. This is to prevent accumulation at the end.

  In addition, the preferable thickness t4 of the ring-shaped main body 4 of the beam reinforcing ring 3 is 1.5 to 3.5 times the thickness t1 of the web 1a of the beam 1 made of H-shaped steel (or I-shaped steel). The preferable groove width w5 of the through groove 5 is 1 to 3 times the thickness t4 of the ring-shaped main body 4.

  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 completely filled with the weld bead Wb as shown in FIG.

  In this way, 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 main body 4 is filled with the weld bead Wb, the through groove 5 of the beam reinforcing ring 3 is completely eliminated. Thus, since the weld bead Wb and the ring-shaped main body 4 are continuously raised or have a 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. Further, since the beam reinforcing rings 3 and 13 are cast steel products for welded structures, the manufacturing cost thereof is much lower than that of a steel plate beam reinforcing ring. Costs can be greatly reduced.

  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.

  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. In the case of the beam reinforcing ring 3 of the embodiment shown in FIGS. 3 (a) and 3 (b), in order to prevent twisting at the time of manufacturing the beam reinforcing ring, the intermediate portion in the longitudinal direction of each through groove 5 is used. An anti-twist piece 30 (shown in phantom lines in FIG. 3) that crosses the groove 5 is cast integrally with the ring-shaped main body 4 on the back side, and the anti-twist piece 30 is cut off later.

  FIG. 4 shows a beam opening reinforcing structure when the opening 2 formed in the beam 1 is a quadrangle. The beam reinforcing ring 13 used for this is formed on the web 1a of the beam 1 made of H-shaped steel. The rectangular ring-shaped body 4 is formed of a steel plate-shaped rectangular ring body 4 having the same shape as the formed rectangular opening 12 and having the same inner diameter as the rectangular opening 12. ), The through-grooves 5 for welding are formed in a straight line for each side of the upper, lower, left, and right sides. A non-groove portion 6 is formed between the adjacent end portions.

  When the opening 2 of the web 1a of the beam 1 is reinforced by such a square beam reinforcing ring 13, as shown in FIGS. 4 (a) and 4 (b), the beam reinforcing ring 13 is connected to the ring-shaped main body. 4 is brought into contact with one side of the web 1a (or both sides as indicated by the phantom line in FIG. 4B) so that the inner peripheral edge 4a of the web 4 and the inner peripheral edge 2a of the opening 12 of the web 1a match. The beam reinforcing ring 13 is welded to the web 1a from the through groove 5 to fix the beam reinforcing ring 13 to the web 1a, thereby forming a beam opening reinforcing structure as shown.

  The welding method in the through groove 5 of the beam reinforcing ring 3 is the same as that in the previous embodiment described with reference to FIG.

  5 (a) and 5 (b) show still another embodiment of the beam opening reinforcing structure according to the present invention. For example, the circular opening 2 (or square) of the beam 1 made of large H-shaped steel is shown. When the groove width of the through groove 5 of the beam reinforcing ring 3 (or 13) that reinforces the shape opening 12) is wide and the groove depth is deep, the point described with reference to FIGS. As shown in FIG. 5, fillet welding is performed along the inner peripheral edge of the through groove 5 of the beam reinforcing ring 3 (or 13) without filling the through groove 5 with the weld bead Wb as in the embodiment. Can be performed efficiently, and a sufficient reinforcing effect can be secured. In the case of the embodiment shown in FIG. 5 (a), the opening end side of the inner side surface portion of the through groove 5 is formed in a round shape, and in the case of the embodiment shown in FIG. 5 (b), the inner side surface portion of the through groove 5 is Since it is formed in a tapered shape, fillet welding along the inner peripheral edge of the through groove 5 can be easily performed.

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

(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). The front view which shows the beam opening part reinforcement structure in case the opening part of a beam is a rectangle, (b) is the VV sectional view taken on the line (a). (a) And (b) is sectional drawing which shows other embodiment of the beam opening part reinforcement structure which concerns on this invention. (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 2 Beam opening 3 Beam reinforcement ring 4 Ring-shaped main body 5 Through groove 6 Non-groove Wb Weld bead

Claims (6)

  For a welded structure in which a through-groove for welding is continuously formed in the circumferential direction, leaving at least one non-grooved portion in a ring-shaped main body having substantially the same shape and the same inner diameter as the opening of the beam The beam reinforcing ring made of cast steel is brought into contact with one or both sides of the beam so that the inner peripheral edge of the ring-shaped main body and the inner peripheral edge of the beam opening substantially coincide with each other. A beam opening reinforcement structure that is welded to the beam and fixed.   The non-groove part formed in the ring-shaped body of the beam reinforcement ring is formed in a cross-sectional mountain shape so that the surface opposite to the side in contact with the beam is inclined downward from the circumferential middle part to both ends thereof. The beam opening reinforcement structure according to claim 1.   The beam opening reinforcing structure according to claim 1 or 2, wherein the through groove formed in the ring-shaped main body of the beam reinforcing ring has an inner surface formed in a round shape or a tapered shape.   The beam opening reinforcing structure according to any one of claims 1 to 3, wherein the beam reinforcing ring is fixed by being welded to the beam so that the through groove is filled with a weld bead.   The beam opening reinforcing structure according to any one of claims 1 to 3, wherein the beam reinforcing ring is welded along the inner peripheral edge of the through groove and fixed to the beam. The beam opening reinforcing structure according to any one of claims 1 to 5, wherein the beam reinforcing ring is welded to the beam from the through groove, and is welded along the outer peripheral edge of the ring-shaped main body and fixed to the beam. .

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