JP2018135667A - Lateral reinforcement rigid structure of steel beam and beam slab connection method of building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lateral reinforcement rigid structure of a steel beam capable of preventing an increase in steel frame amount or processing labor for steel beam, and easy to construct.SOLUTION: The lateral reinforcement rigid structure includes: an upper flange 11; a lower flange 12; and a web 13 connecting the upper flange 11 and the lower flange 12. The lateral reinforcement rigid structure further includes: a steel beam 3 with both ends connected to a pair of pillars 2, 2; a slab 4 attached onto the steel beam 3; and connection members (14, 14) which are disposed on both sides of the web 13 while penetrating the upper flange 11 and the lower flange 12, and each fixed to at least the lower flange 12 and the slab 4 by fixing means (16, 17). The steel beam 3 is laterally reinforced by the connection member, and the steel beam 3 is thereby prevented from being lateral buckling.SELECTED DRAWING: Figure 2

Description

  The present disclosure relates to a lateral stiffening structure for a steel beam and a beam slab coupling method for complementing the lateral stiffness of a steel beam in a building.

  The “2015 Technical Report on Structural Standards for Buildings” (hereinafter referred to as “Technical Standards Manual”), supervised by the Ministry of Land, Infrastructure, Transport and Tourism, shows the necessity of retained lateral strength for steel beams. Holding strength lateral stiffening means that after both ends of the beam material have reached a fully plastic state, not only the both end portions of the material that exhibit sufficient rotational capacity, but also other elastic-plastic region portions do not cause lateral buckling. Complementing such rigidity.

  The steel beam and the slab made of reinforced concrete above the steel beam are usually fastened by a headed stud. The stud is welded to the upper surface of the upper flange of the steel beam, and the horizontal force transmitted from the slab is transmitted to the steel beam through the stud. Lateral buckling is a phenomenon in which the steel beam is bent around the strong axis and the compression side protrudes out of the plane. In the technical standard manual, stiffening methods using a small beam or a cane are encouraged as a method of suppressing lateral buckling.

  In response to this, various inventions have been proposed. For example, Patent Document 1 proposes a structure in which a stiffener (reinforcing plate) is attached to a steel frame beam itself without providing a small beam or a buckling prevention steel material. In Patent Document 2, at least one of the left and right reinforcing plates attached to the steel beam at a predetermined interval protrudes upward from the upper surface of the upper flange while avoiding the upper flange, and is fixed to the reinforcing bar of the floor slab, thereby causing lateral buckling. Preventing structures have been proposed. In Patent Document 3, a reinforced concrete slab provided on a steel beam without attaching a lateral buckling stiffener to prevent lateral buckling to the steel beam exceeds the number required for restraining the lateral movement of the steel beam. A structure having a torsional rigidity that is joined to a flange by a stud and restricts rotational deformation of a steel beam has been proposed.

Japanese Patent Laid-Open No. 9-256659 JP 2004-218321 A JP 2012-12788 A

  However, in the structure of Patent Document 1, the steel large beam is not joined to the slab, and lateral buckling must be prevented by the rigidity of the steel large beam to which the stiffener is attached, so that the cross-sectional dimension of the steel large beam is increased. In the structure of Patent Document 2, the steel beam is joined to the floor slab by the reinforcing plate, and the lateral buckling of the steel beam is also suppressed by the floor slab. The cost increases due to the increase in labor for assembling the reinforcing bars of the floor slab. In the structure of Patent Document 3, the amount of steel frame does not increase, but the number of studs increases, so that the labor of processing the steel beam to which the studs are attached increases.

  Moreover, although the structure of patent documents 1-3 can be employ | adopted when constructing a new building, it is difficult to employ | adopt for the repair construction which supplements the lateral rigidity of the steel beam of an existing building. That is, in the structure of Patent Document 1, it is necessary to replace the entire steel beam. In the structure of Patent Document 2, it is necessary to wind the floor slab from the lower surface side and fix the reinforcing plate to the reinforcing steel bar, and further, welding work is required to join the reinforcing plate to the existing steel beam. Not preferable. In the structure of Patent Document 3, in order to provide the stud, the slab must be removed and reconstructed over substantially the entire upper surface of the steel beam.

  In view of such a background, it is a first object of the present invention to provide a transverse stiffening structure for a steel beam that can suppress an increase in the amount of steel and an increase in labor for processing the steel beam and that is easy to construct. . Moreover, this invention makes it the 2nd subject to provide the beam slab coupling | bonding method for complementing the lateral rigidity of the steel beam applicable also to an existing building.

  In order to solve the first problem, the aspect of the lateral stiffening structure of the steel beam (3) according to the present invention includes an upper flange (11), a lower flange (12), and the upper flange and the lower flange. A steel beam (3) having both ends joined to a pair of columns (2, 2), a slab (4) constructed on the steel beam, Connecting members (14, 14) that are provided on both sides of the web so as to penetrate the upper flange and the lower flange, and are fixed to at least the lower flange by fixing means (16, 17) and fixed to the slab. It is characterized by having.

  According to this configuration, since the lower flange is fixed to the slab by the connecting member, the steel frame is supplemented with the lateral rigidity of the steel beam without increasing the amount of the steel frame and suppressing an increase in the processing effort of the steel beam. Lateral buckling of the beam can be suppressed.

  In the above configuration, the connecting member (14) is a bolt (14) having at least a shaft portion (15) having an external thread formed on an outer peripheral surface, and the fixing means is screwed into the external thread, A pair of nuts (17C and 17D) that sandwich the lower flange (12) or a head (16) integrally formed at one end of the shaft portion and the male screw are screwed together to cooperate with the head. And a nut (17C) for holding the lower flange.

  According to this configuration, a through hole for inserting a bolt into the lower flange is formed, and the bolt can be fixed to the lower flange with a pair of nuts or a bolt head and a nut. It is easy to process the means and fix them. Further, since it is not necessary to weld the connecting member to the steel beam, there is no risk of welding failure, and the lateral rigidity of the steel beam can be reliably complemented.

  Moreover, the said structure WHEREIN: The said volt | bolt (14) is good also as fixed to the said upper flange (11) with a pair of nut (17A * 17B, 17B * 17C).

  According to this structure, since an upper flange is fixed to a slab with a volt | bolt, the lateral buckling of a steel beam can be suppressed more effectively.

  Moreover, the said structure WHEREIN: The said volt | bolt (14) is good to be fixed to the said slab by the upper part of the said axial part (15) embed | buried under the said slab (4).

  According to this configuration, by constructing the slab by placing concrete so as to bury the upper portion of the shaft portion, the bolt can be fixed to the slab, and the fixing operation of the bolt to the slab is easy.

  In the above configuration, the head (16) is disposed at a position spaced upward from the upper flange (11) in the bolt (14) or screwed to the shaft (15). A nut (17A) is preferably arranged.

  According to this configuration, the bonding strength of the bolt to the slab can be effectively increased with a simple configuration in which the head portion or the nut is provided in the shaft portion.

  In the above configuration, the bolt (14) includes the shaft (15) fixed to the inner surface of the hole (4a) formed with the male screw on the outer peripheral surface and the upper end formed in the slab (4). It is good that it is an anchor bolt having at least.

  According to this configuration, since the bolt is an anchor bolt, the bolt can be fixed to the slab without rolling the slab after the slab is constructed.

  In order to solve the second problem, an aspect of the beam slab coupling method according to the present invention includes an upper flange (11), a lower flange (12), and a web that connects the upper flange and the lower flange ( 13), a beam of a building (1) having a steel beam (3) having both ends joined to a pair of columns (2, 2) and a slab (4) constructed on the steel beam A slab coupling method comprising a step of forming through holes (11a, 12a) in the upper flange and the lower flange (FIGS. 3C and 6B), and penetrating the upper flange and the lower flange. Inserting the connecting member (14) into the through hole (FIGS. 3D and 6D), and fixing the upper portion of the connecting member to the slab (FIG. 3B), (D), (E), FIGS. 6 (C) to (E)) and the connecting member. Affixing the serial lower flange (FIG. 3 (D), the FIG. 6 (E)), characterized in that it comprises a.

  According to this configuration, the connecting member inserted into the through hole so as to pass through the upper flange and the lower flange is fixed to the slab and the lower flange to complement the lateral rigidity of the steel beam of the building, and the lateral buckling of the steel beam Can be suppressed. Therefore, it can be applied to existing buildings.

  Moreover, the said structure WHEREIN: It is good to further include the step (FIG.3 (D), FIG.6 (E)) which fixes the said connection member (14) to the said upper flange (11).

  According to this configuration, since the upper flange is fixed to the slab by the connecting member, the lateral buckling of the steel beam can be more effectively suppressed.

  Moreover, in the said structure, the step which fixes the upper part of the said connection member (14) to the said slab (4) is the said upper flange (11) in the said slab (4) constructed | assembled on the said steel beam (3). The step of turning the upper part of the through-hole (11a) from the upper surface side (FIG. 3B), and the step of arranging the upper part of the connecting member in the part where the slab is beaten (FIG. 3D) And a step (FIG. 3E) of placing concrete (5) in the portion where the slab is wound so as to bury the upper part of the connecting member.

  According to this structure, the upper part of a connection member can be easily fixed to a slab only over the part in which the connection member of a slab is provided.

  Further, in the above configuration, the step of fixing the upper portion of the connecting member (14) to the slab (4) is performed using the through hole (11a) of the upper flange (11), and the steel beam (3). Forming a hole (4a) from the lower surface side in the slab (4) constructed above (FIG. 6 (C)), and disposing an upper part of the connecting member in the hole (FIG. 6 (D)) , (E)) and a step of fixing the upper part of the connecting member to the inner surface of the hole (FIG. 6E).

  According to this structure, the upper part of a connection member can be fixed to a slab, without rolling a slab.

  As described above, according to the present invention, it is possible to suppress an increase in the amount of steel frames and an increase in labor for processing the steel beams, and to complement the lateral stiffening structure of the steel beams that is easy to construct, and the lateral rigidity of the steel beams in the building. A beam slab coupling method can be provided.

Schematic plan view of a building to which the lateral stiffening structure according to the first embodiment is applied II-II sectional view in FIG. Explanatory drawing of the construction procedure in the case of applying the horizontal stiffening structure which concerns on 1st Embodiment to the existing building Sectional drawing corresponding to FIG. 2 of the lateral stiffening structure which concerns on 2nd Embodiment Sectional drawing corresponding to FIG. 2 of the lateral stiffening structure which concerns on 3rd Embodiment Explanatory drawing of the construction procedure in the case of applying the horizontal stiffening structure concerning 3rd Embodiment to the existing building

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

<< First Embodiment >>
First, a first embodiment will be described with reference to FIGS. FIG. 1 is a schematic plan view of a building 1 to which a lateral stiffening structure according to the present invention is applied. As shown in FIG. 1, the building 1 has a plurality of pillars 2 arranged in the X direction and the Y direction orthogonal to each other in plan view. The column 2 may be a steel frame structure or a steel frame reinforced concrete structure. Between each pair of pillars 2 and 2 adjacent to each other in the X direction and the Y direction, a steel beam 3 having both ends joined to the pair of pillars 2 and 2 is spanned for each layer. The interval between the columns 2 is longer in the Y direction than in the X direction, and the steel beam 3 extending in the Y direction is longer than the steel beam 3 extending in the X direction.

  2 is a cross-sectional view taken along the line II-II in FIG. As shown in FIG. 2, a slab 4 made of reinforced concrete is constructed on the steel beam 3 on each floor. The slab 4 is made of reinforced concrete and may be formed by cast-in-place concrete 5 or may be formed by disposing precast concrete floor slabs. In FIG. 2, although the concrete 5 is hatched, members that do not appear in the cross section as seen through the concrete 5 are also shown.

  The slab 4 of the present embodiment is a double reinforcing bar having a lower reinforcing bar 8 and an upper reinforcing bar 9 each consisting of a plurality of main reinforcing bars 6 extending in the X direction and a plurality of distributing bars 7 extending in the Y direction. . In other embodiments, the slab 4 may be a single bar arrangement. Moreover, although the slab 4 of the example of illustration is constructed | assembled using the removed formwork which is not shown in figure, the concrete 5 is exposed to the lower surface, the concrete 5 is cast using a deck plate, and the slab 4 May be constructed integrally with the deck plate and include the deck plate.

  The steel beam 3 is formed of I-shaped steel and has an upper flange 11, a lower flange 12, and a web 13 that connects the upper flange 11 and the lower flange 12. At a predetermined position in the axial direction of the steel beam 3, the upper flange 11 and the lower flange 12 are attached to the left and right sides of the web 13 by being fixed to the slab 4, the upper flange 11 and the lower flange 12. Bolts 14 and 14 are provided as connecting members connected to the slab 4. Further, stiffeners (not shown) are provided at predetermined positions in the axial direction of the steel beam 3 so as to be coupled to the upper flange 11, the lower flange 12, and the web 13 in pairs on the left and right sides of the web 13. It may be.

  Each bolt 14 is a headed bolt having a shaft portion 15 having a male screw formed on the outer peripheral surface and a head portion 16 integrally formed at one end of the shaft portion 15, and is formed on the upper flange 11 and the lower flange 12. The shaft portion 15 is inserted into the through holes 11a and 12a from above, and the head portion 16 is disposed so as to be separated from the upper flange 11 upward. The bolt 14 is fixed to the slab 4 by embedding the upper portion of the shaft portion 15 and the head portion 16 in the concrete 5.

  Four nuts 17 (17A to 17D) are screwed into the male screw of the shaft portion 15, and the bolt 14 is secured by these four nuts 17 (hereinafter referred to as first nut 17A to fourth nut 17D in order from the top). It is fixed to the upper flange 11 and the lower flange 12. Specifically, the bolt 14 is fixed to the upper flange 11 by the first nut 17A and the second nut 17B sandwiching the upper flange 11, and the third nut 17C and the fourth nut 17D sandwich the lower flange 12. This is fixed to the lower flange 12. A washer may be interposed between each nut 17 and the upper flange 11 or the lower flange 12 to prevent loosening.

  In other embodiments, at least one of the first nut 17A and the second nut 17B may not be provided. Even if the first nut 17A is not provided, the upper flange 11 is fixed to the slab 4 by the second nut 17B, and the lower flange 12 is connected to the upper flange 11 and the slab 4 by the bolts 14. Even if the second nut 17 </ b> B is not provided, the lower flange 12 is connected to the slab 4 by the bolt 14.

  In any form, the upper part of each bolt 14 functions to be integrated with the slab 4 similarly to the stud provided on the steel beam 3, and the lower flange 12 is connected to the slab 4 by the lower parts of the bolts 14, 14. Therefore, the degree of fixation (integration) between the steel beam 3 and the slab 4 is increased, and the torsional rigidity of the steel beam 3 is improved.

  When the building 1 is a new building, the concrete 5 is struck on the upper flange 11 so that the upper part of the shaft part 15 and the head part 16 of each bolt 14 fixed to the upper flange 11 and the lower flange 12 are embedded. By being provided, the bolt 14 is fixed to the slab 4, and the upper flange 11 and the lower flange 12 of the steel beam 3 are connected to the slab 4 via the bolt 14.

  On the other hand, when the building 1 is an existing building in which the slab 4 has already been constructed on the steel beam 3, the bolts 14 are attached to the steel beam 3 and the slab 4 by the procedure shown in FIG. That is, as shown in FIG. 3A, in the existing building 1, the slab 4 is already constructed on the steel beam 3. Therefore, as shown in FIG. 3B, first, the concrete 5 around the position where the bolt 14 of the slab 4 should be provided is beaten from the upper surface side using a tool such as a breaker or a pick. Next, as shown in FIG. 3C, through holes 11a and 12a are formed at positions where the bolts 14 of the upper flange 11 and the lower flange 12 should be inserted. Note that the work shown in FIG. 3B and the work shown in FIG. 3C may be reversed in order.

  Thereafter, as shown in FIG. 3D, the bolt 14 having the first nut 17A screwed to the shaft portion 15 is inserted into the through hole 11a of the upper flange 11 from above, and the second nut 17B and the third nut 17C are inserted. Are screwed into the shaft portion 15, the shaft portion 15 is inserted into the through hole 12 a of the lower flange 12, the fourth nut 17 </ b> D is screwed into the shaft portion 15, the nuts 17 are tightened, and the bolts 14 are fastened to the steel beam 3. Secure to. At this time, the bolts 14 are arranged so that the head 16 is spaced upward from the upper flange 11 as described above. Finally, as shown in FIG. 3 (E), concrete 5 is placed on the beaten portion of the slab 4 to fix the bolts 14 to the slab 4. As a result, the upper flange 11 and the lower flange 12 of the steel beam 3 are connected to the slab 4 via the bolts 14.

  3E, the bolts 14 need only be positioned by the nuts 17 at the stage of placing the concrete 5 shown in FIG. 3E. Therefore, all the nuts 17 are tightened at the stage of FIG. There is no need to place it in.

  Next, the effects of the lateral stiffening structure of the steel beam 3 constructed in this way and the beam slab coupling method will be described.

  As shown in FIG. 2, in a lateral stiffening structure of a steel beam 3 in which both ends are joined to a pair of columns 2 and a slab 4 is constructed thereon, bolts 14 and 14 as connecting members are connected to an upper flange. 11 and the lower flange 12 are provided on both sides of the web 13 and fixed to at least the lower flange 12 and fixed to the slab 4 by fixing means. Therefore, the lateral rigidity of the steel beam 3 is complemented and the lateral buckling of the steel beam 3 is suppressed without increasing the amount of steel frame and suppressing an increase in processing effort of the steel beam 3.

  Each bolt 14 has at least a shaft portion 15 having an external thread formed on the outer peripheral surface, and is fixed to the lower flange 12 by a third nut 17C and a fourth nut 17D that are screwed into the external thread and sandwich the lower flange 12. Is done. Thus, since the through-hole 12a for allowing the bolt 14 to be inserted into the lower flange 12 is formed and the bolt 14 can be fixed to the lower flange 12 by the pair of nuts 17, the processing of the steel beam 3 and the fixing means is performed. In addition, their fixing work is easy. Moreover, since it is not necessary to weld a stiffening member to the steel beam 3 as in the case of attaching a stiffener or a stud, there is no risk of poor welding, and the lateral rigidity of the steel beam 3 can be reliably complemented.

  In this embodiment, each bolt 14 is also fixed to the upper flange 11 by the first nut 17A and the second nut 17B. Therefore, the lateral buckling of the steel beam 3 is more effectively suppressed.

  Moreover, in this embodiment, each bolt 14 is being fixed to the slab 4 by the upper part of the axial part 15 embed | buried under the slab 4. As shown in FIG. Therefore, by constructing the slab 4 by placing the concrete 5 so as to bury the upper portion of the shaft portion 15, the bolt 14 can be fixed to the slab 4, and the fixing work of the bolt 14 to the slab 4 is easy. is there.

  In the present embodiment, a head 16 integrally formed at the upper end of the shaft portion 15 is disposed at a position spaced upward from the upper flange 11 in each bolt 14. Therefore, the bonding strength of the bolt 14 to the slab 4 can be effectively increased by a simple configuration in which the head portion 16 is provided on the shaft portion 15.

  In addition, a beam slab coupling method that complements the lateral rigidity of the steel beam 3 of the building 1 includes a step of forming through holes 11a and 12a in the upper flange 11 and the lower flange 12, as shown in FIG. As shown in FIG. 3 (D), the steps of inserting bolts 14 and 14 into the through holes 11a and 12a so as to penetrate the upper flange 11 and the lower flange 12, and FIGS. 3 (B), (D), ( E) includes fixing the upper portions of the bolts 14 and 14 to the slab 4, and fixing the bolts 14 and 14 to the lower flange 12 as illustrated in FIG. 3D. Yes. As described above, the bolts 14 and 14 inserted into the through holes 11a and 12a are fixed to the slab 4 and the lower flange 12, whereby the lateral rigidity of the steel beam 3 of the building 1 is complemented. Thereby, the lateral buckling of the steel beam 3 is suppressed. It can also be applied to existing buildings.

  Moreover, this beam slab coupling | bonding method further includes the step which fixes the volt | bolts 14 and 14 to the upper flange 11, as FIG.3 (D) shows. Therefore, the lateral buckling of the steel beam 3 is more effectively suppressed.

  When the building 1 is an existing building in which the slab 4 has already been built on the steel beam 3, the step of fixing the upper portions of the bolts 14 and 14 to the slab 4 is as shown in FIG. The step of scooping the upper part of the through hole 11a of the upper flange 11 in the slab 4 constructed on the steel beam 3 from the upper surface side, as shown in FIG. And placing the concrete 5 on the beaten portion of the slab 4 so as to embed the upper parts of the bolts 14 and 14 as shown in FIG. 3 (E). Including. Thereby, the upper part of the volt | bolt 14 and 14 can be easily fixed to the slab 4 only over the part in which the volt | bolt 14 and 14 of the slab 4 is provided.

<< Second Embodiment >>
Next, a lateral stiffening structure according to the second embodiment will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the element which is the same or the same as that of 1st Embodiment, or a function, and the overlapping description is abbreviate | omitted. The same applies to the third embodiment described below.

  In the lateral stiffening structure of the steel beam 3 according to this embodiment, the bolt 14 is inserted into the through holes 12a and 11a of the lower flange 12 and the upper flange 11 with the head portion 16 downward, and the shaft portion 15 is inserted from below into the steel beam. 3 is attached. The bolt 14 is attached to the lower flange 12 by sandwiching the lower flange 12 in cooperation with the head 16 integrally formed at the lower end of the shaft portion 15 and the fourth nut 17D screwed into the male screw of the shaft portion 15. The second nut 17 </ b> B and the third nut 17 </ b> C are fixed to the upper flange 11 by sandwiching the upper flange 11. The first nut 17 </ b> A is screwed to the shaft portion 15 and disposed at a position spaced upward from the upper flange 11, and is embedded in the concrete 5.

  As described above, in this embodiment, each bolt 14 is screwed into the head 16 integrally formed at one end of the shaft portion 15 and the male screw of the shaft portion 15 so as to cooperate with the head 16 to sandwich the lower flange 12. This is fixed to the lower flange 12 by a fourth nut 17D. Even with such a configuration, the bolt 14 can be fixed to the lower flange 12 by the head 16 and the fourth nut 17D, so that the processing of the steel beam 3 and the fixing means and the fixing operation thereof are easy.

  Moreover, since the 1st nut 17A screwed to the axial part 15 is arrange | positioned in the position spaced apart from the upper flange 11 in each bolt 14, the joining strength with respect to the slab 4 of the bolt 14 is effective with simple structure. Enhanced.

«Third embodiment»
Finally, the lateral stiffening structure according to the third embodiment will be described with reference to FIGS. 5 and 6.

  FIG. 5 is a cross-sectional view corresponding to FIG. 2 of the lateral stiffening structure according to the third embodiment. As shown in FIG. 5, in the lateral stiffening structure of the steel beam 3 of this embodiment, the nut 17 is not provided on the upper flange 11, and the bolt 14 has a male screw formed on the entire outer peripheral surface. It is configured as a full screw bolt (potato thread) consisting only of the shaft portion 15. The bolt 14 is an anchor bolt in which the upper end of the shaft portion 15 is fixed to the inner surface of the hole 4 a formed in the slab 4 with an adhesive 18. Accordingly, the head 16 and the nut 17 (first nut 17A) as in the first and second embodiments are not provided at the upper end of the bolt 14.

  Three nuts 17 of a first nut 17 </ b> A to a third nut 17 </ b> C are screwed into the bolt 14 in order from the top, and the bolt 14 is fixed to the upper flange 11 and the lower flange 12 by these three nuts 17. . Specifically, the bolt 14 is fixed to the upper flange 11 by the first nut 17 </ b> A fastening the upper flange 11 to the slab 4, and the second nut 17 </ b> B and the third nut 17 </ b> C sandwich the lower flange 12. It is fixed to the lower flange 12.

  In the lateral stiffening structure of the present embodiment, the slab 4 is already constructed on the steel beam 3 regardless of whether the building 1 is newly installed or is already installed. Since it is common, the construction procedure is the same. The bolt 14 is attached to the steel beam 3 and the slab 4 by the procedure shown in FIG. That is, as shown in FIG. 6A, the slab 4 has already been constructed on the steel beam 3 in the building 1. Therefore, as shown in FIG. 6B, through holes 11a and 12a are formed at positions where the bolts 14 of the upper flange 11 and the lower flange 12 should be inserted. In addition, when the building 1 is newly established, the through holes 11a and 12a may be previously drilled in the steel beam 3 at a factory.

  Next, as shown in FIG. 6C, a hole 4a is formed in the slab 4 from the lower surface side using the through hole 11a of the upper flange 11. The hole 4a is usually formed as a bottomed hole. Thereafter, as shown in FIG. 6D, the capsule 19 in which the resin adhesive 18 is sealed is inserted into the hole 4a of the slab 4. At the same time, the bolt 14 is inserted into the through hole 12a of the lower flange 12 from below, and the first nut 17A and the second nut 17B are screwed into the bolt 14. Thereafter, the bolt 14 is embedded from the through hole 11a of the upper flange 11 into the hole 4a of the slab 4 while rotating or hitting, the capsule 19 is broken, and the upper portion of the bolt 14 is disposed at a predetermined position. The upper part is adhered to the inner surface of the hole 4a of the slab 4 with an adhesive 18. Thereby, the upper part of the volt | bolt 14 is fixed to the inner surface of the hole 4a by the slab 4. As shown in FIG.

  Finally, as shown in FIG. 6 (E), the first nut 17A is tightened to fasten the upper flange 11 to the slab 4, and the second nut 17B and the third nut 17C are sandwiched by the lower flange 12. The bolt 14 is fixed to the lower flange 12 by tightening. As a result, the upper flange 11 and the lower flange 12 of the steel beam 3 are connected to the slab 4 via the bolts 14.

  In another embodiment, the bolt 14 may be a drive-in anchor bolt that has a sleeve and expands the sleeve by the effect of a wedge by driving-in.

  In the lateral stiffening structure and the beam slab coupling method of the steel beam 3 constructed as described above, the following operational effects can be obtained in addition to the effects described in the above embodiment.

  That is, in the lateral stiffening structure of this embodiment, as shown in FIG. 5, each bolt 14 is a shaft fixed to the inner surface of the hole 4 a formed with a male screw on the outer peripheral surface and the upper end formed in the slab 4. An anchor bolt having at least a portion 15. Therefore, the bolts 14 and 14 can be fixed to the slab 4 without turning the slab 4 after the slab 4 is constructed.

  In the beam slab coupling method of this embodiment applied to the existing building 1 in which the slab 4 has already been constructed on the steel beam 3, the step of fixing the upper portions of the bolts 14 and 14 to the slab 4 is shown in FIG. ), The step of forming the hole 4a from the lower surface side in the slab 4 constructed on the steel beam 3 using the through hole 11a of the upper flange 11, and FIGS. ), The step of arranging the upper portions of the bolts 14 and 14 in the hole 4a, and the step of fixing the upper portions of the bolts 14 and 14 to the inner surface of the hole 4a as shown in FIG. Contains. Thereby, the upper parts of the bolts 14 and 14 can be fixed to the slab 4 without rolling the slab 4.

  Although the description of the specific embodiment is finished as described above, the present invention is not limited to the above embodiment and can be widely modified. For example, the specific configuration, arrangement, quantity, angle, and the like of each member or part can be changed as appropriate without departing from the spirit of the present invention. In addition, a part of the configuration of the above embodiment may be appropriately combined or appropriately discarded. Furthermore, all the constituent elements shown in the above embodiment are not necessarily essential, and can be appropriately selected.

DESCRIPTION OF SYMBOLS 1 Building 2 Column 3 Steel beam 4 Slab 4a Hole 5 Concrete 11 Upper flange 11a Through hole 12 Lower flange 12a Through hole 13 Web 14 Bolt 15 Shaft 16 Head 17 Nut 17A 1st nut 17B 2nd nut 17C 3rd nut 17D 4th nut

Claims (10)

An upper flange, a lower flange, and a steel beam having a web connecting the upper flange and the lower flange, and both ends joined to a pair of columns;
A slab built on the steel beam;
And a connecting member which is provided on both sides of the web so as to penetrate the upper flange and the lower flange, and is fixed to at least the lower flange by fixing means and fixed to the slab. Lateral stiffening structure for steel beams. The connecting member is a bolt having at least a shaft portion on which an external thread is formed on the outer peripheral surface;
The fixing means is a pair of nuts that are screwed to the male screw and sandwich the lower flange, or a head integrally formed at one end of the shaft portion and the male screw and is screwed to the head to cooperate with the head. The lateral stiffening structure for the steel beam according to claim 1, wherein the structure is a nut that clamps the lower flange.   The lateral stiffening structure for the steel beam according to claim 2, wherein the bolt is also fixed to the upper flange by a pair of nuts.   4. The lateral stiffening structure for a steel beam according to claim 2, wherein the bolt is fixed to the slab by an upper portion of the shaft portion embedded in the slab. 5.   5. The nut according to claim 4, wherein the head is disposed at a position spaced apart from the upper flange in the bolt, or a nut that is screwed onto the shaft portion is disposed. Lateral stiffening structure of the steel beam.   The said bolt is the anchor bolt which has the said axial part fixed to the inner surface of the hole by which the said external thread was formed in the outer peripheral surface, and the upper end was formed in the said slab, The Claim 2 or Claim 3 characterized by the above-mentioned. A lateral stiffening structure for the steel beam according to claim 1. An upper flange, a lower flange, a steel beam having a web connecting the upper flange and the lower flange, both ends joined to a pair of columns, and a slab constructed on the steel beam A beam slab connection method for a building,
Forming a through hole in the upper flange and the lower flange;
Inserting a connecting member into the through hole so as to penetrate the upper flange and the lower flange;
Fixing the upper part of the connecting member to the slab;
And fixing the connecting member to the lower flange.   The method according to claim 7, further comprising a step of fixing the connecting member to the upper flange. The step of fixing the upper part of the connecting member to the slab,
Rolling the upper part of the through-hole of the upper flange in the slab constructed on the steel beam from the upper surface side;
Disposing an upper portion of the connecting member on the beaten portion of the slab;
The method according to claim 8, further comprising: placing concrete in a portion where the slab is beaten so as to bury the upper portion of the connecting member. The step of fixing the upper part of the connecting member to the slab,
Using the through hole of the upper flange to form a hole from the lower surface side in the slab constructed on the steel beam;
Disposing an upper portion of the connecting member in the hole;
The method according to claim 8, further comprising: fixing an upper portion of the connecting member to an inner surface of the hole.

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