Steel beam joining method

Abstract

To provide a joint structure and joint method for steel beams that can eliminate the need for a temporary timbering when joining two steel beams made of H-shaped steels during construction of a steel frame.SOLUTION: In a joint structure 100 of two steel beams 10, 20 formed by an H-shaped steel comprising webs 11, 21, upper flanges 12, 22, and lower flanges 13, 23, the ends of the webs 11, 21 of the two steel beams 10, 20 are provided with mutually engaging a first step portion 15 and a second step portion 25, respectively. The second step portion 25 is engaged in a state of mounted on the first step portion 15. The webs 11, 21, the upper flanges 12, 22, and the lower flanges 13, 23 of both steel beams 10, 20 are bolt-connected via splice plates 40A, 40B, 40C, respectively.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention is a steel beam Connection of This relates to the method of combination. [Background technology]

[0002] The steel frame that makes up a steel-framed building (S (Steel) construction) is formed by bridging a main girder (G (Girder) Beam) across brackets formed by H-shaped steel that protrude from columns and the like, with a secondary beam (B (Beam)) bridging between opposing main girders as needed. In more detail, other components of the steel frame include cantilever beams (CG (Cantilever Girder) Beams, CB (Cantilever Beam)) that form the cantilever structure of the building, and underground beams (FG (Footing Girder) Beams) that form the foundation.

[0003] For example, in construction where a steel beam, also made of H-shaped steel, is draped over a bracket made of H-shaped steel projecting from a steel column, a temporary support is typically installed to temporarily support the steel beam, which is lifted and transported by a crane or other device, and positioned to the side of the bracket to join the two. The steel beam, temporarily supported on the temporary support, and the bracket are then bolted together with high-strength bolts (high-tension bolts) via splice plates, and the temporary support is then dismantled and removed. The installation and dismantling of this temporary support requires time and effort, and this problem becomes even more pronounced as the size of the building increases and the number of steel beams to be erected increases.

[0004] For these reasons, when joining steel beams made of H-shaped steel to other components made of H-shaped steel (such as brackets extending from steel columns or separate steel beams) during the construction of steel frames, a joining structure and joining method for steel beams that can eliminate the need for temporary supports is desired.

[0005] Patent Document 1 proposes a joint structure for steel beams in which the ends of steel beams, each consisting of a web and a flange, are joined together. Specifically, the joint structure includes a plate-like joint member fixed to the portion of each steel beam where the end of the upper flange and the upper portion of the continuous web are removed, with the upper surface of the joint member being continuous with the upper surface of the upper flange. Splice plates are attached to both sides of the web on the underside of each joint member, spanning both joint members. A plurality of bolts and nuts fasten the splice plates to the joint members. The joint members are made of plate material thicker than the upper flanges. On both sides of the web on the upper side of the joint member, recesses are provided that are deeper than the height of the bolt heads and wider than the diameter of the heads. A plurality of insertion holes are drilled downward from the bottom of the recesses for inserting the bolt shanks. The splice plate has through holes that correspond to the insertion holes, and the through holes of the joint members are aligned with the through holes of the splice plate, and a bolt is inserted from the through-hole side, with its head fitting into the recess and its tip extending below the splice plate, and then tightened with a nut. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 6-173340 Summary of the Invention [Problem to be solved by the invention]

[0007] According to the steel beam joint structure described in Patent Document 1, the flanges of the H-shaped steel beams that form the top surface of the girder can be joined together without welding, and the top surfaces of the interconnected flanges can be made flat. However, even when constructing this joint structure, the installation of the temporary support structure described above is still required.

[0008] The present invention has been made in consideration of the above-mentioned problems, and provides a steel beam that can eliminate the need for temporary supports when joining two steel beams made of H-shaped steel during the construction of a steel frame. Connection of The purpose of this document is to provide a method for [Means for solving the problem]

[0009] In order to achieve the above object, one aspect of the steel beam joint structure according to the present invention is as follows: A joint structure of two steel beams formed by H-shaped steel having a web, an upper flange, and a lower flange, The ends of the webs of the two steel beams are provided with first and second step portions that engage with each other, and the second step portion is placed on top of the first step portion and engages with the first step portion; The web, the upper flange, and the lower flange of each of the steel beams are connected by bolts via a splice plate.

[0010] According to this aspect, the two steel beams to be joined together have a first step and a second step that engage with each other. By placing the second step on top of the first step during erection and engaging the two, the other steel beam with the second step can be erected without support from temporary shoring, eliminating the need for temporary shoring.

[0011] Here, in a steel beam having a first step, the end of the upper flange is set back further inward (away from the end) of the steel beam than the end of the lower flange to match the first step, and in a steel beam having a second step, the end of the lower flange is set back further inward of the steel beam than the end of the upper flange to match the second step.

[0012] In addition, the two steel beams that are joined to each other may be in a form in which the steel beam with the first stage is a bracket that forms the column-beam joint, and the steel beam with the second stage is a beam that is joined to the bracket, or in a form in which the long steel beam is formed from multiple divided steel beams and is two beams that are joined to each other.

[0013] The first and second sections are engaged with each other, allowing the engaging sections to bear part of the shear force. In conventional structures, the bolts that connect the webs of the two H-shaped steel beams to each other via the splice plate bear the entire shear force, but in this version, the engaging sections of the webs bear part of the shear force, making it possible to reduce the number of bolts connecting the webs.

[0014] In another aspect of the joint structure of the steel beam according to the present invention, The steel beam having the first step portion is a bracket extending from a steel column, The steel beam having the second step portion is characterized in that it is a beam installed between two steel beams that are erected at an interval.

[0015] According to this aspect, the second step of the beam rests on the first step of the bracket extending from the steel column, and the two engage with each other, making it possible to erect a steel beam on the steel column without the need for temporary support. Here, when joining a bracket and a beam, for example, when one steel beam is erected on each bracket extending from two steel columns spaced apart, the steel beam has second step portions at both ends, and by erecting both second step portions on the first step portions of the corresponding brackets, an erection posture can be formed in which the beam is supported by two brackets. A joint structure for the steel beam is then formed at each end of the beam.

[0016] In another aspect of the joint structure of the steel beam according to the present invention, The bolted joint is characterized by using high-strength bolts.

[0017] According to this aspect, the steel beams are joined together by high-strength bolts via splice plates, thereby forming a joint structure with high joint strength.

[0018] In addition, one aspect of the joining method for steel beams according to the present invention is to A method for joining two steel beams formed by H-shaped steel having a web, an upper flange, and a lower flange, The ends of the webs of the two steel beams are provided with first and second step portions that engage with each other, placing the second step portion of one of the steel beams on the first step portion of the other steel beam and engaging them together; The webs, the upper flanges, and the lower flanges of both steel beams are connected by bolts via splice plates.

[0019] According to this aspect, the two steel beams to be joined together have a first step and a second step that engage with each other. By placing the second step on top of the first step during erection and engaging the two, the other steel beam with the second step can be erected without support from temporary shoring, eliminating the need for temporary shoring.

[0020] In another aspect of the joining method for steel beams according to the present invention, The steel beam having the first step portion is a bracket extending from a steel column, The steel beam having the second step portion is a beam installed between two steel beams that are erected at an interval, The splice plate is temporarily joined to the upper flange of the end of the beam in advance, When the second step portion is placed on the first step portion and the two are engaged with each other, the splice plate is engaged with the upper flange of the bracket.

[0021] According to this aspect, by temporarily joining a splice plate to the upper flange of the end of a beam having a second step portion in advance, when erecting the beam on the bracket, the second step portion is placed on top of the first step portion and the two are engaged.In addition, when in this engaged position, the splice plate temporarily joined to the beam is engaged with the upper flange of the bracket, thereby forming an even more stable erection position of the beam on the bracket without any temporary support.

[0022] In another aspect of the joining method for steel beams according to the present invention, The splice plate is temporarily joined to the upper flange by bolting using ordinary bolts; The main joining of the web, the upper flange, and the lower flange to the splice plate is performed by bolting using high-strength bolts.

[0023] According to this aspect, the splice plate is temporarily joined to the top flange of the beam by bolting using normal bolts, which enables the splice plate to be quickly removed when needed due to interference with other members when erecting the beam on the bracket. Furthermore, the main joining of the top flange, bottom flange, and web to the splice plate is performed by bolting using high-strength bolts, thereby forming a joint structure for a steel beam with high joint strength. [Effects of the Invention]

[0024] As can be understood from the above description, the steel beam of the present invention Connection of According to this method, temporary supports are not required when joining two H-shaped steel beams during the construction of a steel frame structure. [Brief explanation of the drawings]

[0025] [Figure 1] 3A to 3C are process diagrams illustrating an example of a method for joining steel beams according to the first embodiment. [Figure 2] 1, is a process diagram illustrating an example of a method for joining steel beams according to the first embodiment. [Figure 3] 2, this is a process diagram illustrating an example of a joining method for steel beams according to the first embodiment, and further illustrates an example of a joining structure for steel beams according to the embodiment. [Figure 4] FIG. 10 is a process diagram illustrating an example of a method for joining steel beams according to the second embodiment. [Figure 5]4A to 4C are process diagrams illustrating an example of a method for joining steel beams according to the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0026] Hereinafter, examples of joining methods and joining structures of steel beams according to embodiments will be described with reference to the accompanying drawings. Note that in this specification and the drawings, substantially identical components will be designated by the same reference numerals, and redundant explanations may be omitted.

[0027] [Method for joining steel beams according to the first embodiment and joint structure of steel beams according to the embodiment] First, a method for joining steel beams according to a first embodiment and an example of a joining structure for steel beams according to the embodiment will be described with reference to Figures 1 to 3. Here, Figures 1 to 3 are process diagrams illustrating an example of a method for joining steel beams according to the first embodiment, and Figure 3 is a diagram further illustrating an example of a joining structure for steel beams according to the embodiment.

[0028] The two steel beams joined by the joining method in the illustrated example are the bracket 10 and the beam 20 that form the column-beam joint 70, but the joining method according to the embodiment may also be applied to other cases, such as joining split beams together when a long beam is made up of multiple split beams.

[0029] As shown in FIG. 1, a beam-column joint 70 is formed by welding a bracket 10 (an example of a steel beam) to the side surface of a steel column 30 formed from a square steel pipe.

[0030] The bracket 10 is formed of an H-shaped steel having a web 11, an upper flange 12, and a lower flange 13, and a plurality of bolt holes 11a, 12a, 13a are opened in the wide surfaces of each. The upper flange 12 and the lower flange 13 are joined to the side surface of the steel column 30 by, for example, butt welding, and the web 11 is joined by, for example, fillet welding.

[0031] On the other hand, the other steel beam joined to the bracket 10 is a beam 20 (an example of a steel beam) that is erected on each of the brackets 10 extending from two steel columns 30 that are erected with a centerline distance between them, as shown in Figure 2.

[0032] The beam 20 is formed from an H-shaped steel beam of the same dimensions and specifications as the bracket 10, and a plurality of bolt holes 21a, 22a, 23a are opened in the wide surfaces of the web 21, upper flange 22, and lower flange 23.

[0033] Returning to Figure 1, a first step 15 is provided at the end of the web 11 of the bracket 10. To match the first step 15, the end of the upper flange 12 is set back further inward (towards the steel column 30) than the end of the lower flange 13 of the bracket 10.

[0034] On the other hand, a second step 25 is provided at the end of the web 21 of the beam 20, which is placed on the first step 15 in the X direction when erecting the beam 20 on the bracket 10. In addition, to match the second step 25, the end of the lower flange 23 is set back more inward of the beam 20 (opposite the steel column 30) than the end of the upper flange 22.

[0035] As shown in Figure 2, a beam 20 is suspended by a crane (not shown) and dropped from above onto each bracket 10 extending from two steel columns 30 erected with a center-line distance between them, so that the second step portions 25 at both ends of the beam 20 are placed on the first step portions 15 of each bracket 10, and the first step portions 15 and second step portions 25 engage with each other to form engagement portions 80, thereby stably supporting the beam 20 against the left and right brackets 10.

[0036] Next, as shown in Figure 3, splice plates 40A are arranged on the left and right sides of the webs 11, 21 of both the bracket 10 and the beam 20 (Figure 3 shows only one splice plate 40A), and they are finally joined together using high-strength bolts 51 and nuts 52.

[0037] Furthermore, a splice plate 40B is arranged above both upper flanges 12, 22 and is finally joined by high-strength bolts 51 and nuts 52, and a splice plate 40C is arranged below both lower flanges 13, 23 and is finally joined by high-strength bolts 51 and nuts 52, thereby forming a joining structure 100 between the bracket 10 and the beam 20 at the column-beam joint 70 of the two steel columns 30.

[0038] According to the method of joining steel beams shown in the figure, the two steel beams 10, 20 to be joined together have a first step 15 and a second step 25 that engage with each other.By placing the second step 25 on top of the first step 15 during erection and engaging the two, the steel beam 20 with the second step 25 can be erected on the steel beam 10 without support from temporary shoring, thereby eliminating the need for temporary shoring.

[0039] Furthermore, because the first step 15 and the second step 25 are engaged with each other, a portion of the acting shear force can be borne by the engaging portion 80. For example, in a conventional structure that does not have an engaging portion, the bolts that connect the webs of the two H-shaped steel beams to be joined together via a splice plate bear the entire shear force, whereas in the connecting structure 100 of the illustrated example, the engaging portion 80 of the webs 11, 21 bears a portion of the shear force, making it possible to reduce the number of bolts 51 that connect the webs 11, 21 to each other.

[0040] [Method for joining steel beams according to the second embodiment] Next, an example of a method for joining steel beams according to the second embodiment will be described with reference to Fig. 4, Fig. 5, and Fig. 3. Here, Fig. 4 and Fig. 5 are process diagrams illustrating an example of a method for joining steel beams according to the second embodiment, in this order.

[0041] In the beam 20 shown in FIG. 4, a splice plate 40B is temporarily joined to the upper surface of the end of the upper flange 22 in advance.

[0042] Here, temporary joining means joining the splice plate 40B in an easily removable manner using ordinary bolts 61 and nuts 62, as opposed to permanent joining using high-strength bolts 51. From the perspective of being easily removable, temporary joining may also include spot welding or the like.

[0043] 5, when the beam 20 is dropped from above onto each of the brackets 10 extending from two steel columns 30, the second step portions 25 at both ends of the beam 20 are placed on the first step portions 15 of each bracket 10, and the first step portions 15 and the second step portions 25 engage with each other to form engagement portions 80. In addition, a portion of the splice plate 40B extending from the upper flange 22 of the beam 20 is engaged with the upper flange 12 of the bracket 10.

[0044] In this way, by virtue of the engagement portion 80 formed by the first and second step portions 15 and 25 of the webs 11, 21 of both the bracket 10 and the beam 20, and the engagement of the splice plate 40B temporarily joined to the beam 20 with the bracket 10, the beam 20 can be erected more stably relative to both brackets 10 without the need for support from temporary shoring.

[0045] Here, if the splice plate 40B protruding to the side interferes with other components not shown when the beam 20 is lowered, the splice plate 40, which is temporarily joined with ordinary bolts 61, can be quickly removed, and therefore there is no risk of delaying the erection work.

[0046] After the beam 20 is stably erected on the left and right brackets 10 as shown in Figure 5, the ordinary bolts 61 are removed, and other splice plates 40A and 40C are arranged as shown in Figure 3. The splice plates 40A, 40B, and 40C are then joined together using high-strength bolts 51 and nuts 52, thereby forming a joint structure 100 between the brackets 10 and the beam 20 at the beam-column joint 70 of the two steel columns 30.

[0047] The present invention is not limited to the configurations shown here, and other embodiments may be possible in which other components are combined with the configurations described in the above embodiments. In this regard, the present invention can be modified within the scope of the present invention, and can be appropriately determined depending on the application form. [Explanation of symbols]

[0048] 10: Steel beam (bracket) 11:Web 11a: Bolt hole 12: Upper flange 12a: Bolt hole 13: Lower flange 13a: Bolt hole 15:First stage part 20: Steel beam (beam) 21:Web 21a: Bolt hole 22: Upper flange 22a: Bolt hole 23: Lower flange 23a: Bolt hole 25:Second stage part 30: Steel column 40A, 40B, 40C: Splice plate 51: High strength bolt 52: Nut 61: Standard bolt 62: Nut 70: Column beam joint 80: Engagement part 100: Steel beam joint structure (joint structure)

Claims

[Claim 1] A method for joining steel beams, comprising the steps of: joining a first steel beam and a second steel beam, both of which are formed by H-shaped steel beams each having a web, an upper flange, and a lower flange; joining the first steel beam to a column in advance; and joining the second steel beam to the first steel beam, the first steel beam is a bracket extending from a steel column; The second steel beam is a beam installed between the two steel columns that are erected at an interval, the first steel beam and the second steel beam have end portions of the webs each having a first step portion and a second step portion that engage with each other; The first step portion and the second step portion are formed by straight lines parallel to the longitudinal direction of the H-shaped steel, A splice plate is temporarily joined to the upper flange of the end of the beam using a normal bolt. The beam is lowered, and the second step portion is placed on the first step portion to engage them together. At this time, the upper flange and the lower flange of the first steel beam are engaged with the upper flange and the lower flange of the second steel beam at their flat surfaces, respectively, and the splice plate is engaged with the upper flange of the first steel beam. The webs, the upper flanges, and the lower flanges of the first steel beam and the second steel beam are each permanently joined by bolt connections using high-strength bolts via a plurality of splice plates, and when this permanent joining is performed, the ordinary bolts are removed from the temporarily joined locations, and the permanent joining is performed by bolt connections using the high-strength bolts. A method for joining steel beams, characterized in that the ordinary bolt is a means for removing one of the temporarily joined splice plates from the beam and continuing erection construction if the splice plate interferes with another member when the beam is being lowered, thereby preventing construction delays.

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