JP2019196637A - Column-beam joint structure, and construction method of column-beam joint structure - Google Patents

Abstract

To provide a joint structure of a concrete column and steel beams allowing workability to be improved using joint members with a simple structure and correction of construction error of steel beams to be easily performed.SOLUTION: A joint structure includes: a first concrete column 11; a first steel beam 21 and a second steel beam 22 extending in a first direction, and having one end faces in a longitudinal direction opposing each other on a top end of the first concrete column, and a part of respective bottom faces abutting the top end; a first joint member jointing the first steel beam to the second steel beam; a third steel beam 23 extending in a second direction intersecting the first direction, and having one end face in a longitudinal direction positioned on the top end; and a second joint member jointing the third steel beam to at least one of the first steel beam, the second steel beam, or the first joint member.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a beam-column joint structure and a method for constructing the beam-column joint structure.

  As a joint structure between a concrete column and a steel beam, for example, as described in Patent Document 1, a bracket that penetrates a joint portion of a concrete column is arranged, and a steel beam is joined to this bracket. In such a joint structure, high load resistance can be obtained because the bracket penetrates the concrete column. Patent Document 1 proposes that in such a joint structure, a beam member holding member for preventing the bracket from tilting or overturning during construction is arranged.

JP 2013-253367 A

  However, in the column beam connection structure described in Patent Document 1, for example, the connection between the bracket and the steel beam bears a bending moment applied to the steel beam. The bracket and the steel beam are joined by, for example, welding or high-strength bolt friction joining. In the case of welding, however, there is a problem that it takes time to perform the construction and is highly dependent on the skill of the welder. In the case of high-strength bolt friction welding, the number of bolts increases due to the large bending moment, and the frictional force is reduced when the bolt holes are oblong to absorb construction errors due to construction. In order to do so, there is a problem that the number of bolts further increases.

  Therefore, the present invention can improve the workability by using a simple structure joining member in the joint structure between the concrete column and the steel beam, and can easily absorb the construction error of the steel beam. It is an object of the present invention to provide a new and improved beam-column joint structure and a method for constructing the beam-column joint structure.

According to an aspect of the present invention, the first concrete column and the one end surface extending in the first direction are opposed to each other on the top end of the first concrete column and each bottom surface. A first steel beam and a second steel beam in which a part of the first steel beam is in contact with the top end, a first joint member that joins the first steel beam to the second steel beam, and a second crossing in the first direction A third steel beam extending in the direction of one side and having one end surface in the longitudinal direction on the top end, and the third steel beam is a first steel beam, a second steel beam, or a first joining member And a second joining member joined to at least one of the two.
According to the above configuration, by using the support pressure of the concrete, it is possible to use a joining member having a simple structure for joining the steel beams, improving workability, and joining the steel beam and the joining member. It is also easy to absorb the construction error of the steel beam at the joint portion between the joint members.

The column beam joint structure may further include a concrete member that covers the first joint member and the second joint member on the top end.
By covering the joint with a concrete member, the support pressure of the concrete can be more stably applied.

The above-mentioned beam-column joint structure may further include a second concrete column constructed continuously with the concrete member.
The column beam joint structure of the present invention can be used for the uppermost part and the intermediate part of the structure. In the case of the intermediate portion, a larger concrete support pressure can be obtained by further constructing the concrete column above the joint portion.

In the above-mentioned column beam joint structure, the first joint member includes a joint plate extending in the first direction and bolted to at least one of the first steel beam and the second steel beam. The bolt hole formed in the steel beam, the second steel beam, or the joint plate may have a shape extending in the first direction.
By making the bolt hole a shape extending in the first direction such as an oval shape, it is possible to easily absorb construction errors of the steel beam.

In the above-mentioned beam-column joint structure, at least one of the first joint member and the second joint member may be a one-piece member.
By making the joining members integrally formed, field welding for joining the steel beams becomes unnecessary. In addition, since the joining member itself can be welded in advance, it may be integrally formed by welding.

The above-mentioned column beam connection structure extends in the second direction, and one end surface in the longitudinal direction is on the top end with the first steel beam, the second steel beam, or the first bonding member interposed therebetween. A fourth steel beam facing one end face in the longitudinal direction of the steel beam, and a third joint for joining the fourth steel beam to the first steel beam, the second steel beam, or the first joint member You may further provide a member.
The column beam connection structure of the present invention can be applied to any column beam connection structure of the middle column and the side column as described above.

  According to another aspect of the present invention, a step of constructing the first concrete column, and a part of the bottom surface of the first steel beam and the second steel beam extending in the first direction are attached to the top of the first concrete column. A step of placing the end surfaces of the first steel beam and the second steel beam in the longitudinal direction opposite to each other on the top end in a second direction intersecting the first direction. A step of arranging one end side of the extending third steel beam in the longitudinal direction on the top end, a step of joining the first steel beam to the second steel beam using the first joining member, Joining the steel beam to at least one of the first steel beam, the second steel beam, or the first joining member by using the second joining member. Is provided.

  The construction method may further include a step of placing a concrete member covering the first joining member and the second joining member on the top end.

  As described above, according to the present invention, in a joint structure between a concrete column and a steel beam, the workability is improved by using a joining member having a simple structure, and the construction error of the steel beam can be easily absorbed. Can be.

It is a perspective view of the column beam junction structure concerning a 1st embodiment of the present invention. It is the figure which saw through the concrete member of an upper pillar and a junction part in FIG. It is the figure which removed the volt | bolt which fastens a joining member in FIG. It is the IV-IV sectional view taken on the line of FIG. It is the figure which looked at FIG. 2 from a different viewpoint. It is a figure which shows the modification of 1st Embodiment. It is a figure which shows the modification of 1st Embodiment. It is a figure which shows the process of the construction method of the column beam junction structure which concerns on the 1st Embodiment of this invention. It is a perspective view of the column beam junction structure concerning a 2nd embodiment of the present invention. It is sectional drawing of the column beam junction structure which concerns on the 2nd Embodiment of this invention. It is a perspective view of the column beam junction structure concerning a 3rd embodiment of the present invention.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the present specification and drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.

(Column-beam joint structure according to the first embodiment)
With reference to FIG. 1 to FIG. 5, a column beam joint structure according to a first embodiment of the present invention will be described. FIG. 1 is a perspective view of a column beam joint structure according to the present embodiment. FIG. 2 is a perspective view of the upper column and the concrete member of the joint in FIG. 1. FIG. 3 is a view in which the bolt for fastening the joining member in FIG. 2 is removed. 4 is a cross-sectional view taken along line IV-IV in FIG. FIG. 5 is a diagram of FIG. 2 viewed from a different viewpoint.

  As shown in FIG. 1, a beam-column joint structure 1 according to this embodiment includes a lower column 11 (first concrete column), a joint 12, and an upper column 13 (second concrete column) that are reinforced concrete members. And main beams 21 and 22 (first and second steel beams) and cross beams 23 (third steel beams) which are steel members. The lower column 11 and the upper column 13 are both formed continuously in the vertical direction (z direction in the figure), and the joint portion 12 is located between the lower column 11 and the upper column 13. As will be described later, since the concrete constituting the joint portion 12 is placed after the construction of the lower column 11, a joint is formed at a position corresponding to the top end 11 </ b> A of the lower column 11. On the other hand, the concrete that forms the joint 12 and the upper column 13 can be cast at the same time. In this case, there is no joint between the joint 12 and the upper column 13 that are integrally constructed. .

  In the beam-column joint structure 1, the main beams 21 and 22 extend in a first direction (x direction in the drawing) in the horizontal plane, and the cross beam 23 extends in a second direction (y direction in the drawing) in the horizontal plane. . In the illustrated example, the main beams 21 and 22 and the cross beam 23 are all H-shaped steel, and have upper flanges 21A, 22A, 23A, lower flanges 21B, 22B, 23B, and webs 21C, 22C, 23C. In the present embodiment, the main beams 21, 22 and the cross beam 23 are all set to the same beam, and the lower flanges 21B, 22B, 23B constituting the bottom surfaces of the main beams 21, 22 and the cross beam 23 are set. Are both in contact with the top end 11 </ b> A of the lower column 11. The main beams 21 and 22 and the cross beam 23 do not necessarily have to be the same beam. For example, a cross beam having a smaller beam length than the main beam may be used. In this case, if the upper surfaces of the upper flanges of all the beams have the same height, the bottom of the cross beam does not contact the top end of the lower column. Further, as shown in the figure, a slab 14 may be constructed on the main beams 21 and 22 and the cross beam 23. The slab 14 is a reinforced concrete member constructed integrally with the joint portion 12, for example. Also good.

  As shown in FIGS. 2 to 4, the beam-column joint structure 1 further includes a joint plate 31 (first joint member) that joins the main beams 21 and 22 to each other, and a cross beam 23 that connects the main beams 21 and 22. And an L-shaped joint plate 32 (second joining member). In the present embodiment, each of the joint plate 31 and the L-shaped joint plate 32 is a member integrally formed of, for example, a steel plate. Specifically, the joint plate 31 of the present embodiment is integrally formed as a whole by one flat plate, and the L-shaped joint plate 32 is formed by bending one flat plate or using angle steel. Thus, the portion joined to the main beams 21 and 22 and the portion joined to the cross beam 23 are integrally formed.

  In the present embodiment, the first joint member such as the joint plate 31 and the second joint member such as the L-shaped joint plate 32 are one-pieces such as a bent plate or various shaped steels. These members are used. In other embodiments, it is also possible to form a joining member by welding a plurality of members. In this case, the combination of the welding material and the base material, the influence of the welding heat on the base material, It is necessary to consider distortion and the like, and further, management of welding conditions and inspection of welding quality are required. Although it is possible to form a joining member by fastening a plurality of steel materials using bolts or the like, it is necessary to consider the connection between the bolts and the steel materials or beams, and the number of parts increases. Therefore, in consideration of the manufacturing and preparation of the joining member itself and the work efficiency of joining the beams, the integral joining member as in this embodiment is advantageous.

  In the present embodiment, the bolt holes described below for inserting bolts used for joining the main beams 21 and 22 are provided at the ends of the webs 21C and 22C of the main beams 21 and 22, respectively. Five are arranged in the vertical direction. On the other hand, the joint plate 31 is provided with five bolt holes for the main beam 21 and five bolt holes for the main beam 22 (a total of ten) at positions aligned with the bolt holes of the main beams 21 and 22. Yes.

  In the present embodiment, the main beams 21 and 22 are arranged such that one end surfaces 21D and 22D in the longitudinal direction thereof face each other on the top end 11A of the lower column 11, and the joint plate 31 includes the main beams 21 and 22D. The main beam 21 is joined to the main beam 22 by joining the webs 21C and 22C of the web 22 using bolts 311 and nuts 312 and bolts 321A and nuts 322A described later. More specifically, as shown in FIG. 5, a bolt 311 and a nut 312 are used for joining the main beam 22 using two bolt holes located on the upper and lower ends of the five bolt holes. A bolt 321A and a nut 322A are used for joining using the three bolt holes located in the center. Here, as shown in FIGS. 3 and 4, in the present embodiment, the bolt holes 213 and 223 formed in the main beams 21 and 22 and the bolt holes 313 formed in the joint plate 31 are both in the drawing. It has an oval shape extending in the x direction. Accordingly, the size of the gap between the end surface 21D of the main beam 21 and the end surface 22D of the main beam 22 is adjusted, and the construction error of the main beams 21 and 22 in the x direction (that is, the longitudinal direction of the main beams 21 and 22). Can be absorbed. The construction error can be absorbed as long as at least one of the bolt holes 213 and 223 and the bolt hole 313 has a shape extending in the x direction, but each bolt hole has an oval shape. By having it, the range of error that can be absorbed can be expanded.

  On the other hand, in the present embodiment, the cross beam 23 is arranged so that one end face 23D in the longitudinal direction is on the top end 11A of the lower column 11, and the L-shaped joint plate 32 is connected to the web 23C and the joint of the cross beam 23. The cross beam 23 is joined to the joint plate 31 by being joined to the plate 31 using bolts 321 and nuts 322. Since the joint plate 31 is joined to the main beams 21 and 22, the L-shaped joint plate 32 may be said to indirectly join the cross beam 23 to the main beams 21 and 22. Here, as shown in FIG. 3, in this embodiment, the bolt holes 233 formed in the cross beam 23 and the bolt holes 323 formed in the L-shaped joint plate 32 both extend in the y direction in the figure. Have a different shape. Thereby, the size of the gap between the end face 23D of the cross beam 23 and the joint plate 31 is adjusted, and the construction error of the cross beam 23 in the y direction (that is, the construction error in the longitudinal direction of the cross beam 23) is absorbed. be able to. Moreover, in this embodiment, the bolt hole 324 formed in the L-shaped joint plate 32 and the bolt hole 313 formed in the joint plate 31 both have a shape extending in the x direction in the figure. Thereby, the construction error of the cross beam 23 in the x direction (that is, the construction error in the width direction of the cross beam 23) can be absorbed. The construction error can be absorbed as long as at least one of these bolt holes has a shape extending in the y direction or the x direction, similar to the example of the joint plate 31 described above. .

  Here, in the illustrated example, the bolt 321 that joins the L-shaped joint plate 32 to the joint plate 31 is inserted through the L-shaped joint plate 32, the joint plate 31, and the web 22 </ b> C of the main beam 22. Has been. That is, the bolt 321A and the nut 322A (see FIG. 4) in this portion are means for joining the L-shaped joint plate 32 to the joint plate 31 and means for joining the joint plate 31 to the main beam 22 (the bolt 311 described above). And also described as nut 312). By such common use of bolts and nuts between the joining members, for example, a sufficient width direction (z direction in the drawing) dimension can be secured for both the joint plate 31 and the L-shaped joint plate 32. Further, as in the illustrated example, both the joint plate 31 and the L-shaped joint plate 32 are joined near the center of the webs 21C, 22C and 23C of the main beams 21 and 22 and the cross beam 23, so The eccentric bending of the main beams 21 and 22 and the cross beam 23 due to the stress transmitted through the joint plate 31 and the L-shaped joint plate 32 later can be minimized.

  In addition, it is also possible not to use a volt | bolt and a nut in common between joining members, The example in that case is shown as a modification of 1st Embodiment in FIG. 6 and FIG. In the example shown in FIGS. 6 and 7, the joint plate 31 is disposed above the webs 21 </ b> C and 22 </ b> C of the main beams 21 and 22, and the L-shaped joint plate 32 is formed between the web 22 </ b> C of the main beam 22 and the cross beams 23. It is arranged below the web 23C. In this case, the bolt 311 and the nut 312 for joining the joint plate 31 and the bolt 321 and the nut 322 for joining the L-shaped joint plate 32 are not commonly used, and the bolt 321 and the nut 322 are the L-shaped joint plate. 32 is joined to the web 22 </ b> C of the main beam 22. That is, in this example, the L-shaped joint plate 32 directly joins the cross beam 23 to the main beam 22. In this case, the dimension in the width direction (z direction in the drawing) of the joint plate 31 and the L-shaped joint plate 32 is restricted, and the joint plate 31 and the L-shaped joint plate 32 are the webs of the main beams 21 and 22 and the cross beam 23. Although it is eccentrically joined to 21C, 22C, and 23C, it is advantageous in that the types of parts can be reduced by making the lengths of bolts 311 and 321 common, for example.

  In the above example, three bolt holes for joining the L-shaped joint plate 32 and the cross beam 23 and joining the L-shaped joint plate 32 and the joint plate 31 are arranged in the height direction. However, the number and arrangement of bolts are arbitrary. For example, more or fewer bolt holes may be arranged in the height direction, or bolt holes are arranged in two or more rows in the direction intersecting the height direction (x direction or y direction in the figure). May be. The same applies to the bolt holes for joining the joint plate 31 and the main beams 21 and 22, and various arrangements are possible without being limited to the above example.

(Construction method of column beam connection structure)
With reference to FIG. 8, the construction method of the column beam junction structure which concerns on the 1st Embodiment of this invention is demonstrated. In the illustrated example, first, the lower pillar 11 (first concrete pillar) is constructed by, for example, precasting or on-site placement (S1). At this stage, for example, as shown in FIG. 3, the top end 11A of the lower pillar 11 is exposed. Next, a steel beam in the first direction (x direction shown in FIG. 1) is placed on the top end 11A (S2). Specifically, in this step, a part of the lower flanges 21B and 22B constituting the bottom surfaces of the main beams 21 and 22 (first and second steel beams) are placed on the top end 11A, and the respective end surfaces 21D. 22D are opposed to each other on the top end 11A.

  Next, the steel beams in the first direction are joined to each other using a joining member (S3). Specifically, this step is a step of joining the main beam 21 to the main beam 22 using the joint plate 31 (first joining member). Next, the steel beam in the second direction (the direction intersecting the first direction, the y direction shown in FIG. 1) is joined to the steel beam in the first direction using a joining member (S4). . Specifically, in this step, one end in the longitudinal direction of the cross beam 23 (third steel beam) is arranged on the top end of the lower column 11, and the cross beam 23 is connected to the joint plate 31 and the L-shaped joint plate 32. It is the process of joining using (2nd joining member). In this step, since the cross beam 23 is supported by the lower column 11 via the joint plate 31 and the main beam 21 or the main beam 22, the lower flange 23B of the cross beam 23 is not necessarily in direct contact with the lower column 11. Good. 6 and 7, the cross beam 23 is joined to the main beam 22 using the L-shaped joint plate 32. In another example, the cross beam 23 may be joined to the main beam 21 using an L-shaped joint plate 32.

  After the steel beams are joined to each other on the top end 11A of the lower column 11 by the above steps S2 and S3, the concrete of the joint 12 covering the joint plate 31 and the L-shaped joint plate 32 is placed (S5). . As described with reference to FIG. 1, the joint portion 12 is a reinforced concrete member positioned between the lower column 11 and the upper column 13. In step S5, the joint 12 and the upper column 13 may be integrally constructed by placing the concrete of the joint 12 and the concrete of the upper column 13 simultaneously. Alternatively, the joint 12 may be constructed with other concrete members such as the slab 14. After the concrete of the joint 12 is hardened, the joint plate 31 and the L-shaped joint plate 32, and the longitudinal ends of the main beams 21, 22 and the cross beams 23 joined to each other by these joint plates are supported by the concrete. It becomes possible to counter the bending moment using pressure.

  When high load resistance is not required in a column beam connection structure that joins a concrete column and a steel beam, the length of the steel beam is about half the height of the steel beam at the end in the longitudinal direction of the steel beam. Is embedded in a concrete member, the bending moment acting on the steel beam may be sufficiently counteracted by the support pressure of the concrete. In such a case, the joint between the steel beams can be a pin joint that does not receive a bending moment. In the present embodiment, assuming such a case, the first joint member (joint plate 31) that joins the main beams 21 and 22 to each other, and the second joint that joins the cross beam 23 to the main beams 21 and 22 are used. The member (L-shaped joint plate 32) is configured to join only between the steel beam webs 21C, 22C, and 23C. In another embodiment, when it is necessary for the joint between the steel beams to take a bending moment, the joining member may join not only the web but also the flange. However, in this case as well, since the bearing pressure of the concrete is obtained, the number of bolts may be smaller than that of high-strength bolt friction welding, for example, when steel beams are joined to brackets, and bolt holes are used to absorb construction errors. It is also easy to make an oval shape.

  In the beam-column joint structure according to the first embodiment of the present invention as described above, the first concrete column (lower column 11) and the second concrete column (upper column 13) and the first and second columns. In the joint structure between the steel beams (main beams 21 and 22) and the third steel beam (cross beam 23), a joint member (joint) having a simple structure for joining the steel beams by utilizing the support pressure of concrete. The plate 31 and the L-shaped joint plate 32) can be used, and the workability is improved. By making the joining member a member integrally formed of, for example, a steel plate, field welding for joining steel beams becomes unnecessary. Further, the bolt holes for joining the joining members to the steel beam are extended in, for example, the first direction (x direction shown in FIG. 1) and the second direction (y direction shown in FIG. 1), respectively. By making it circular, it becomes easy to absorb construction errors due to the construction of each steel beam.

(Second Embodiment)
With reference to FIG. 9 and FIG. 10, the column beam junction structure which concerns on the 2nd Embodiment of this invention is demonstrated. FIG. 9 is a perspective view of the beam-column joint structure according to the present embodiment. As in FIG. 3 in the first embodiment, the upper column and the concrete member of the joint are seen through, and the bolt that fastens the joint member is shown. It is a removed figure. FIG. 10 is a cross-sectional view of the beam-column joint structure according to the present embodiment.

  As shown in FIG. 9 and FIG. 10, the beam-column joint structure 2 according to the present embodiment includes the cross beam 24 (first beam) in addition to the components of the beam-column joint structure according to the first embodiment described above. 4 steel beams) and an L-shaped joint plate 33 (third joining member). The cross beam 24 extends in the second direction (y direction in the figure) in the horizontal plane in the same manner as the cross beam 23, and one end surface 24 </ b> D in the longitudinal direction is on the top end 11 </ b> A of the lower column 11 on the main beams 21 and 22. Or it opposes end surface 23D of the cross beam 23 (3rd steel frame beam) on both sides of the joint board 31. FIG. The cross beam 24 is an H-shaped steel having an upper flange 24A, a lower flange 24B, and a web 24C, and a portion corresponding to a longitudinal end portion of the lower flange 24B constituting the bottom surface of the cross beam 24 is formed on the top end 11A of the lower column 11. It touches. On the other hand, the L-shaped joint plate 33 is a member integrally formed of, for example, a steel plate, and intersects with the web 24C of the cross beam 24 and the web 21C of the main beam 21 using a bolt 331 and a nut 332. The beam 24 is joined to the main beam 21. Also in this embodiment, the main beams 21 and 22 and the cross beams 23 and 24 are all set to the same beam, but each beam does not necessarily have to be the same beam. For example, two cross beams may be used in which the beam length is smaller than that of the main beam. In this case, if the upper surfaces of the upper flanges of all the beams have the same height, the bottoms of the two cross beams do not contact the top ends of the lower columns.

  Here, as shown in FIG. 9, in this embodiment, the bolt holes 243 formed in the cross beam 24 and the bolt holes 333 formed in the L-shaped joint plate 33 both extend in the y direction in the figure. Have a different shape. Thereby, the size of the gap between the end face 24D of the cross beam 24 and the web 21C of the main beam 21 is adjusted, and the construction error of the cross beam 24 in the y direction (that is, the construction error in the longitudinal direction of the cross beam 24). Can be absorbed. In the present embodiment, both the bolt hole 334 formed in the L-shaped joint plate 33 and the bolt hole 213 formed in the main beam 21 have a shape extending in the x direction in the drawing. Thereby, the construction error of the cross beam 24 in the x direction (that is, the construction error in the width direction of the cross beam 24) can be absorbed. The construction error can be absorbed as long as at least one of these bolt holes has a shape extending in the y direction or the x direction, similar to the example of the first embodiment. .

  In the illustrated example, the bolt 331 that joins the L-shaped joint plate 33 to the main beam 21 is inserted through the L-shaped joint plate 33, the web 21 </ b> C of the main beam 21, and the joint plate 31. ing. That is, the bolt 331A and the nut 332A (see FIG. 10) in this portion are means for joining the L-shaped joint plate 33 to the main beam 21 and means for joining the joint plate 31 to the main beam 22 (above bolt 311 described above). And also described as nut 312). By such common use of the bolt and nut between the joining members, for example, a sufficient width direction (z direction in the drawing) dimension can be secured for both the joint plate 31 and the L-shaped joint plate 33. Further, as shown in the illustrated example, both the joint plate 31 and the L-shaped joint plate 33 are joined to the vicinity of the center of the webs 21C, 22C, and 24C of the main beams 21 and 22 and the cross beam 24. The eccentric bending of the main beams 21 and 22 and the cross beam 24 due to the stress transmitted through the joint plate 31 and the L-shaped joint plate 32 later can be minimized. In this embodiment as well, it is possible not to use the bolts and nuts in common between the joining members as in the modification described with reference to FIGS. 6 and 7 in the first embodiment.

  The construction method of the column beam joint structure according to the present embodiment may be the same as the construction method described with reference to FIG. 8 in the first embodiment. However, in the case of this embodiment, the process S4 includes the process of joining the cross beam 24 to the main beam 21 using the L-shaped joint plate 33.

  As shown in the second embodiment of the present invention as described above, the embodiment of the present invention includes two sets of steel frames that extend in two directions in a horizontal plane on a concrete column extending in the vertical direction and intersect each other. The embodiment of the present invention can also be applied to a so-called middle-column column beam connection structure in which beams are bonded.

(Third embodiment)
With reference to FIG. 11, the column beam joint structure which concerns on the 3rd Embodiment of this invention is demonstrated. FIG. 11 is a perspective view of the beam-column joint structure according to the present embodiment. As shown in FIG. 11, in the beam-column joint structure 3 according to the present embodiment, the joint portion 12 and the upper column 13 in the beam-column joint structure according to the first embodiment described above do not exist, and the main beam 21 and 22 (first and second steel beam) and cross beam 23 (third steel beam) are exposed in a state of being placed on the top end 11 </ b> A of the lower column 11. For example, when the column beam connection structure 3 is located at the uppermost part of the structure, the longitudinal ends of the main beams 21 and 22 and the cross beam 23 may not be covered with concrete. Also in this case, it is possible to use the concrete bearing pressure acting on the lower flanges 21B, 22B, 23B constituting the bottom surfaces of the main beams 21, 22 and the cross beam 23 to counter the bending moment acting on the steel beam. it can.

  In this embodiment, since the supporting pressure of concrete does not act on the upper flanges 21A, 22A, and 23A side, a joining member that joins the upper flanges 21A, 22A, and 23A to each other in addition to the webs 21C, 22C, and 23C if necessary. (Not shown) may be provided. However, in this case as well, since the support pressure of concrete can be used on the lower flanges 21B, 22B, and 23B side, for example, the number of bolts may be smaller than that of high-strength bolt friction joining when joining a steel beam to a bracket, It is also easy to make the bolt hole into an oval shape to absorb construction errors. Further, in order to prevent the main beams 21 and 22 and the cross beam 23 from being inclined, toppled or dropped during and after the construction, for example, anchor bolts embedded in the lower pillar 11 are provided in the lower flanges 21B, 22B and 23B. The beam member holding member (not shown) as described in Japanese Patent Application Laid-Open No. 2013-253367 may be installed by being inserted through the formed through hole and fixed with a nut. Even in the case of a so-called middle column as described in the second embodiment, a structure in which the end portion of the steel beam is not covered with concrete is possible as in this embodiment.

(Supplement)
Although the example which arrange | positions the joint board 31 which is an example of a 1st joining member only on the single side | surface of the steel beam web was demonstrated above, the structure which arrange | positions a joint board on both surfaces of the steel beam web is also possible. In this case, two-surface friction welding is performed with a high-strength bolt, and a bending moment larger than one-surface friction can be resisted. In addition, the L-shaped joint plates 32 and 33 are exemplified as the second and third joining members that join the main beams 21 and 22 and the cross beams 23 and 24. However, it is possible to join orthogonal or intersecting members. If it is a member, you may use the joining member which has other shapes, such as a T-shaped coupling board. Such a joining member may be integrally formed by bending a steel plate, such as an L-shaped joint plate, or a member obtained by welding a steel plate or cutting an H-shaped steel web, such as a T-shaped joint plate. (Cut T) may be integrally formed.

  The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious that a person having ordinary knowledge in the technical field to which the present invention pertains can come up with various variations and modifications within the scope of the technical idea described in the claims. Of course, it is understood that these also belong to the technical scope of the present invention.

  DESCRIPTION OF SYMBOLS 1, 2, 3 ... Column beam connection structure, 11 ... Lower column, 11A ... Top end, 12 ... Joint part, 13 ... Upper column, 14 ... Slab, 21, 22 ... Main beam, 23, 24 ... Cross beam, 31 ... Joint plate, 32 ... L-shaped joint plate, 33 ... L-shaped joint plate.

Claims (8)

A first concrete pillar;
A first steel beam extending in a first direction, with one end face in each longitudinal direction facing each other on the top end of the first concrete pillar, and a portion of each bottom face in contact with the top end; 2 steel beams,
A first joining member for joining the first steel beam to the second steel beam;
A third steel beam extending in a second direction intersecting the first direction and having one longitudinal end surface on the top end;
A column beam joint structure comprising: a second joint member that joins the third steel beam to at least one of the first steel beam, the second steel beam, or the first joint member.   The beam-column joining structure according to claim 1, further comprising a concrete member that covers the first joining member and the second joining member on the top end.   The beam-column joint structure according to claim 2, further comprising a second concrete column constructed continuously with the concrete member. The first joining member includes a joint plate extending in the first direction and bolted to at least one of the first steel beam and the second steel beam,
4. The bolt hole formed in the first steel beam, the second steel beam, or the joint plate has a shape extending in the first direction. 5. Column beam connection structure described in 1.   5. The beam-column joining structure according to claim 1, wherein at least one of the first joining member and the second joining member is an integral member. The third steel beam extending in the second direction and having one end surface in the longitudinal direction sandwiching the first steel beam, the second steel beam, or the first joint member on the top end A fourth steel beam facing one end face in the longitudinal direction of
6. The apparatus according to claim 1, further comprising: a third joining member that joins the fourth steel beam to the first steel beam, the second steel beam, or the first joining member. The beam-column joint structure according to claim 1. Building a first concrete pillar;
A part of the bottom surface of the first steel beam and the second steel beam extending in the first direction is placed on the top end of the first concrete column, and the first steel beam and the second steel beam A step of causing one end face of each of the longitudinal directions to face each other on the top end;
Disposing on the top end one end side in the longitudinal direction of a third steel beam extending in a second direction intersecting the first direction;
Joining the first steel beam to the second steel beam using a first joining member;
Joining the third steel beam to at least one of the first steel beam, the second steel beam, or the first joining member using a second joining member. Construction method of column beam connection structure.   The construction method of the column beam joint structure according to claim 7, further comprising a step of placing a concrete member covering the first joint member and the second joint member on the top end.

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