JP2018168653A - Different diameter column-beam joint structure and manufacturing method thereof - Google Patents

Abstract

To provide a different diameter column-beam joint structure that suppresses manufacturing costs by reducing the cutting and processing of steel columns, shortens the working time of the construction work without requiring welding at the site, and eliminates a beam bracket.SOLUTION: In a different diameter column-beam joint structure in which an H-shaped steel beam 5 is dry-joined using high-strength bolts between different diameter columns having different thickness dimensions of steel columns 2, 3, joining is performed by a split T joint method, in which either one of an upper flange 50 and a lower flange 51 of the H-shaped steel beam 5 is joined via a through diaphragm which is welded by penetrating the steel columns 2, 3 while being divided vertically and the other is joined via a bracket which is bolt-joined directly to the steel column 2, or a divided outer diaphragm joint method, in which an outer diaphragm 7 is friction-joined by a surface pressure with a side surface 20 of the steel column 2 via a divided diaphragm 70 which is divided into a plurality of sections. The through diaphragm is formed as a thick through diaphragm 6 thicker than the flange thickness of the H-shaped steel beam 5 and the flange of the H-shaped steel beam 5 is bolt-joined to the diaphragm.SELECTED DRAWING: Figure 1

Description

  TECHNICAL FIELD The present invention relates to a different-diameter beam-to-beam connection structure by dry bonding using high-strength bolts between different-diameter columns having different thicknesses of steel columns, and a method for manufacturing the same.

  Conventionally, in order to reinforce and prevent deformation, there is a diaphragm at a joint where a steel column such as a column pillar (square steel pipe) or a round steel pipe constituting a building (building structure) and a beam made of H-shaped steel are rigidly joined. The construction method is applied. In the through diaphragm method, which is one of such diaphragm methods, the steel column is cut at the upper and lower flange positions of the H-shaped steel beam, and then the diaphragm is inserted and welded to the steel column. The H-shaped steel beam is cut out in advance as a beam bracket for the portion to be joined to the steel column, welded to the diaphragm through its upper and lower flanges, and attached by welding the web to the skin plate of the steel column. The beam bracket and the H-shaped steel beam attached to the diaphragm are joined to each other by high-strength bolt friction joining.

  In such a through-diaphragm method, in addition to the steel column cutting process, a step of welding the diaphragm to the steel column is added. In particular, in this welding and joining process, it is necessary to weld completely through the entire circumference of the steel frame pipe. For this reason, in addition to these cutting and welding processes, it is necessary to inspect the welded portion, and there is a problem in that the burden of work labor associated with production increases. In addition to this, a skilled welding engineer is required to ensure the quality of the welded portion. In addition, if the welded part is rejected in the nondestructive inspection, it is necessary to rework it, resulting in an excessive production cost and a long production period. In addition, since the welding and cutting processes are included, there are many opportunities to use various devices, leading to an increase in energy consumption associated with production, which may adversely affect the environment.

  Further, as a conventional diaphragm method, a high blade method (registered trademark) has been put into practical use. In this high blade construction method (registered trademark), two sets of cast steel integrated outer diaphragms (high blades) for an upper flange and a lower flange are inserted into a steel column. Then, the upper and lower flanges of the H-shaped steel beam are fixed to each outer diaphragm by welding. In the H-shaped steel beam, a beam bracket for joining to the steel column is cut out. The upper and lower flanges of the beam bracket are welded to the high blade, and the web of the beam bracket is welded to the rib plate attached to the column skin plate. The beam bracket and the H-shaped steel beam are joined to each other by high-strength bolt friction joining. In such high blades, various shapes and the like having excellent stress transferability have been studied.

  However, in this high blade method, the operation of inserting the high blade into the steel column requires many steps, and the operation itself is often difficult. For this reason, a special insertion device for inserting the high blade into the steel column may be required. In addition, in this high blade method, it is necessary to weld the high blade to the upper and lower flanges of the H-shaped steel beam, and as described above, the production labor and cost are increased, and the construction period is prolonged. There was also.

  Furthermore, as a conventional beam-column joining method, a high-strength bolt tension joining method has also been put into practical use. In such a construction method, a steel column and an H-shaped steel beam are connected by split tee or high-strength bolt tension bonding via an end plate welded to the short surface of the H-shaped steel beam.

  However, in this high-strength bolt joint between the split tee or end plate and the steel column, the steel column has a closed cross section, so that a lot of work labor is required to insert and tighten the high-strength bolt. . One-side high-strength bolts that can be inserted from one direction have been put into practical use, but the bolts are expensive in the first place and have limited strength. In addition, bolt holes must be drilled in the steel column, and a special control device is required for positioning and ensuring accuracy.

  In addition, a technique in which the outer diaphragm is configured by a plurality of divided diaphragms is also disclosed (see, for example, Patent Document 1). However, even in the disclosed technique of Patent Document 1, since the divided diaphragm employs a structure in which the steel column is joined by welding, as described above, the manufacturing labor and the manufacturing cost are increased, and the construction period is increased. There is also a problem that it will be prolonged.

  Similarly, Patent Document 2 discloses an example in which an outer diaphragm is configured by combining column-beam joint hardware such as a split diaphragm. According to the technology disclosed in Patent Document 2, a method is adopted in which a beam-to-column fitting is joined by a bolt without welding to a steel column. In addition, the inside of the column beam joint metal is filled with a filler such as mortar resin, for example, to transmit stress by the adhesive force of the filler and the shear strength of the bolt. The technique disclosed in Patent Document 2 has an advantage that it is possible to prevent an increase in production labor and the like by eliminating the need for welding work when attaching to a steel column.

  However, in the technique disclosed in Patent Document 2 described above, since a process of filling a filler such as a mortar resin is included, the production labor is increased correspondingly, and the material cost of the filler is required. There was a problem.

  Therefore, in order to solve these problems and reduce the welding work in the field in the outer diaphragm joint between the column and the beam, the applicants of the present application disclosed the joint structure between the column and the beam described in Patent Document 3 and A joining method was proposed. In Patent Document 3, a beam-plate 22 in a split diaphragm 2 in which an outer diaphragm 7 is divided into a plurality of parts in a column-to-beam joint structure in which an H-shaped steel beam 3 is joined to a steel pipe column 5 by an outer diaphragm 7 3, the column plate 23 provided at the end of the beam plate 22 is brought into contact with the steel pipe column 5, and the column surface of the steel pipe column 5 is separated from the column plate 23 between the divided diaphragms 2. A column-to-beam joint structure is disclosed that is fastened and fixed to each other via bolts 25 and nuts 26 so that contact pressure acts on them (claim 1 of Patent Document 3, paragraphs [0030] to [0047] of the specification). ], See FIGS.

  In addition, since the stress acting on the building decreases as it goes to the upper floor, it is uneconomical to use steel columns of the same thickness from the lowest floor to the uppermost floor in the steel structure that constitutes the building. For this reason, the thickness dimension of the steel column is often reduced as going upstairs. In the steel beam-column joint, when the upper and lower column diameters are reduced to have different thickness dimensions (including the case where the width of the rectangular column column is reduced), conventionally, as shown in FIGS. Two main beam-column joint structures are known.

  As shown in FIG. 11, the first column beam connection structure is a tapered column type connection structure (see, for example, Patent Document 4). In this joining structure, the diameter of the steel column C1 on the lower floor with a large pipe diameter and the steel column C2 on the upper floor with a smaller pipe diameter are gradually reduced as they go upward between the beams of the H-shaped steel beam to be joined. Are joined by a tapered column C3.

  These steel columns (C1 to C3) are connected through through diaphragms D1 and D2, and a plurality of beam brackets Hb for welding to the H-shaped steel beam are welded to these through diaphragms D1 and D2. Yes. The upper and lower flanges F1 and F2 of these beam brackets Hb are attached so that the lower surface of the flange F1 is flush with the lower surface of the diaphragm D1, and the upper surface of the flange F2 is flush with the upper surface of the diaphragm D2. . Further, the web W of the beam bracket Hb is welded to the side surface of the tapered column C3.

  In such a tapered column type column beam connection structure, the side surfaces of the steel columns C1 and C2 and the side surface of the tapered column C3 coincide with each other, so that stress transmission is smooth. However, since the tapered column C3 is a custom-made product, there is a problem that it is difficult to obtain and cost increases, and it takes a number of production days, which causes a delay in the construction period.

  The second column beam connection structure is a thick diaphragm type connection structure as shown in FIG. 12 (see, for example, Patent Document 5). The thick-diaphragm-type joint structure has a lower-diameter steel column C1 having a large pipe diameter and an upper-stage steel column C2 having a smaller pipe diameter than the above-mentioned diaphragm D2 through a thick-walled diaphragm D3. It is what is joined. Further, the lower diaphragm D1 'is a through diaphragm, like the diaphragm D1 described above. For this reason, the steel column C1 on the lower floor is cut up to the through diaphragm D1, and there is a dice-shaped connecting piece C4 between the through diaphragm D1 and the thick diaphragm D3 between the H-shaped steel beams. It is intervened.

  Such a thick-diaphragm-type beam-column joint structure is configured to counteract the rigidity and strength of the thick-walled diaphragm D3 at the different-diameter column-beam joint where the force acting on the column is amplified by the moment due to the pipe diameter difference. is there. For this reason, there exists an advantage that the freedom degree of the installation position of the steel column C2 of an upper floor becomes high within the range of the thickness diaphragm D3. However, the wall-thickness diaphragm column beam connection structure is not specially ordered, but the steel column C1 on the lower floor must be cut once, and the diaphragm D1 and the connecting piece C4 must be welded through the ends. It was. For this reason, it takes a lot of labor to process the pillars, which increases costs.

  In addition, in both the tapered column type joint structure and the thick diaphragm type joint structure, when the beam bracket Hb is welded to the steel column C1 in advance at the factory, the beam bracket Hb protrudes, and thus the steel column C1. There was a problem of poor transport efficiency.

  Of course, it is also conceivable to weld the H-shaped steel beam directly to the steel column C1 at the building construction site. However, since the welding of the H-shaped steel beam to the steel column C1 will be carried out in the field, it will be greatly influenced by the weather, it is difficult to predict until the completion of the construction period, and further, when field welding is performed, There was a problem because it was necessary to take measures to ensure quality.

JP 2001-262699 A Japanese Unexamined Patent Publication No. 7-324380 Japanese Patent Laying-Open No. 2015-224460 JP 60-120107 A JP-A-6-264504

  Therefore, the present invention has been devised in view of the above-mentioned problems, and the object of the present invention is to reduce the cutting and processing of the steel column to reduce the manufacturing cost and to eliminate the need for on-site welding. Another object of the present invention is to provide a different-diameter column-beam joining structure that shortens the working time of the one-way work and improves the efficiency of transporting the steel frame without using a beam bracket, and a manufacturing method thereof.

  The different-diameter beam-to-column connection structure according to the first invention is a different-diameter beam-to-beam connection structure by dry bonding using a high-strength bolt between H-shaped steel beams and different-diameter columns having different thickness dimensions. Either the upper flange or the lower flange of the H-shaped steel beam is joined via a through diaphragm welded by dividing the steel column up and down, and the other is directly bolted to the steel column. It is joined by split tee joining that joins through split tees, or split outer diajoining that frictionally joins with the side pressure of the steel column through a split diaphragm in which the outer diaphragm is divided into a plurality of parts, In addition, the through diaphragm is a thick through diaphragm that is thicker than the flange thickness of the H-shaped steel beam to be joined, and the flange of the H-shaped steel beam is bolted to the thick through diaphragm. And butterflies.

  The different-diameter column beam joint structure according to a second aspect of the present invention is the first invention, wherein either the upper flange or the lower flange of the H-shaped steel beam is joined by the non-divided die joint, and the steel column is In addition, the column diaphragm having a B-shaped cross section, the split diaphragm, the joint surface between the split diaphragms are arranged near the corner portion of the column pillar, the joint surface is fastened to each other by a joint member, The H-shaped steel beam is frictionally joined between the different-diameter columns by generating a surface pressure with the side surface of the steel column.

  The different-diameter column beam joint structure according to a third aspect of the present invention is the first or second aspect of the invention, wherein the other flange of the H-shaped steel beam is interposed via the split diaphragm that is bolted in advance before being lifted by a lifting machine. It is characterized by being joined to the steel column by outside-diameter die joining.

  A method for manufacturing a different diameter column-beam joint structure according to a fourth aspect of the present invention is the method of manufacturing a different diameter column beam joint structure according to any one of claims 1 to 3, wherein the thick-diameter diaphragm and the H One flange of the shaped steel beam is bolted, and then the other flange of the H-shaped steel beam is joined by split tee joining or split outer die joining.

  According to a fifth aspect of the present invention, there is provided a method for manufacturing a different-diameter column beam joint structure according to the fourth aspect, wherein the other flange of the H-shaped steel beam is joined to the steel column via the split diaphragm by a split outer die joint. The H-shaped steel beam is bolted to the split diaphragm before being lifted by a lifting machine.

  According to the first to fifth inventions, in the deformed column beam structure in which the column diameter is reduced to have different thickness dimensions, there is one through diaphragm vertically penetrating the steel column. For this reason, it is not necessary to once cut the steel column on the lower floor and weld the diaphragm and the connecting piece through the end portion as in the thick-diaphragm-type column beam connection structure. Further, unlike the tapered column-type beam-column connection structure, a tapered column which is a custom-made product that is difficult to obtain and expensive is not necessary. For this reason, according to the 1st invention-the 5th invention, cutting and processing of a steel pillar can be reduced and manufacturing cost can be held down. Further, since the flange of the H-shaped steel beam is bolted to the thick-walled diaphragm, there is no need to weld the H-shaped steel beam and the through diaphragm on site. For this reason, the work time of the construction work can be shortened by eliminating the welding on site. In addition, since the H-shaped steel beam is directly bolted to the thick diaphragm, a beam bracket is not required. Therefore, the conveyance efficiency of the steel column is improved.

  In particular, according to the second invention, since either the upper flange or the lower flange of the H-shaped steel beam is joined by a non-divided die joint, the steel column or the H-section steel is adjusted by adjusting the non-split die joint portion. It is possible to easily cope with errors due to beam construction errors and product warping and twisting. For this reason, the work time of the construction work can be greatly shortened, and the installation cost can be reduced.

  In particular, according to the third invention, since the split diaphragm is bolted to the H-shaped steel beam in advance before being lifted by the lifting machine, it is possible to omit the time for unloading the split diaphragm by the lifting machine. For this reason, according to 3rd invention, the work time of the construction method of a steel frame can be shortened, and installation cost can further be reduced.

  In particular, according to the fourth aspect of the invention, after the thick-walled diaphragm and one flange of the H-shaped steel beam are bolted together, the other flange of the H-shaped steel beam is joined by split tee joining or split outer die joining. For this reason, when installing the H-shaped steel beam, the position of the bolt hole of the diaphragm and the H-shaped steel beam is adjusted, and then the other flange of the H-shaped steel beam and the split tee bracket or split outside Join with the diaphragm joined diaphragm. Therefore, it is not necessary to adjust the position with extremely high accuracy by inserting an H-shaped steel beam between the outer diaphragms, and the work time for constructing the steel frame can be shortened.

  In particular, according to the fifth aspect of the present invention, since the split diaphragm is bolted to the H-shaped steel beam in advance before being lifted by the lifting machine, the time for unloading the split diaphragm by the lifting machine can be omitted. For this reason, according to 6th invention, the work time of the construction method of a steel frame can be shortened, and installation cost can be reduced further.

It is a perspective view which shows the different-diameter column beam junction structure which concerns on 1st Embodiment of this invention. It is a top view which shows the same-diameter column beam connection structure same as the above. It is the side view which looked horizontally at the different-diameter column beam joint structure same as the above. It is a perspective view which shows the division | segmentation diaphragm of the same diameter column beam connection structure same as the above. It is an exploded top view which shows the state before mounting | wearing a division | segmentation diaphragm same as the above to a column pillar. It is a top view which shows the state before fastening with the joining member of a division | segmentation diaphragm same as the above. It is a perspective view which shows another embodiment which replaced the split diaphragm of the same-diameter column beam connection structure same as the above with a split tee. It is a perspective view which shows the different diameter column beam junction structure which concerns on 2nd Embodiment of this invention. It is a top view which shows the same-diameter column beam connection structure same as the above. It is the side view which looked horizontally at the different-diameter column beam joint structure same as the above. It is a perspective view which shows the conventional taper column type different diameter column beam joining structure. It is a perspective view which shows the conventional thickness diaphragm type different diameter column beam joining structure.

  Hereinafter, a different diameter column beam joint structure and a manufacturing method thereof according to an embodiment of the present invention will be described in detail with reference to the drawings.

[First Embodiment]
First, the different-diameter column beam joint structure according to the first embodiment of the present invention will be described with reference to FIGS. The different-diameter column-beam joint structure 1 according to the first embodiment is a different-diameter column-beam joint structure based on a split outer die joint, which is one of dry joints using high-strength bolts. Note that dry bonding refers to bonding that does not require an open time except for welding, bonding using grout, and the like. FIG. 1 is a perspective view showing a different-diameter column-beam joint structure according to a first embodiment of the present invention, and FIG. 2 is a plan view of the different-diameter column-beam joint structure of FIG. 3 is a side view of the different-diameter column beam joint structure of FIG. 1 viewed horizontally.

  The different diameter column-to-beam connection structure 1 according to the first embodiment of the present invention includes a lower-diameter steel column 2 having a large pipe diameter and an upper-diameter steel column 3 having a smaller pipe diameter. The portion 4 has a different-diameter column beam joining structure for joining a plurality of H-shaped steel beams 5 made of H-shaped steel. The illustrated form illustrates the case where four H-shaped steel beams 5 are joined to one steel column 2.

  In addition, the steel column 2 and the steel column 3 are welded together via a thick-walled diaphragm 6 described later. Then, the upper flange 50 of the H-shaped steel beam 5 is fastened to the diaphragm 6 by a joining member described later, and the lower flange 51 of the H-shaped steel beam 5 is connected to the steel column via the outer diaphragm 7 described later. 2 is friction bonded.

(Steel column)
As shown in FIGS. 1-3, the steel column 2 and the steel column 3 which concern on this embodiment are the square cross-section which consists of square steel pipes (BCR, BCP) for building structures by cold roll molding or cold press molding. Column columns having four side surfaces 20, 30 respectively. Of course, the steel column according to the present invention is not limited to these, and other general square steel pipes (STKR400, STKR490), other square steel pipes such as box columns assembled by welding from four steel plates, and a circular cross section. It may be a circular steel pipe such as a circular steel pipe for building structures. In short, the steel column according to the present invention may be a steel column made of a steel material having design strength. In addition, the pipe diameter in a steel column refers to the diameter in the case of a circular steel pipe, and in the case of a column pillar, it refers to the thickness dimension, that is, the horizontal distance between the side surfaces 20 and 30.

(H-shaped steel beam)
As shown in FIGS. 1 to 3, the H-shaped steel beam 5 according to the present embodiment is a rolled steel material such as a rolled steel material for building structures (SN400, SN490), a rolled steel material for general structures SS400, a rolled steel material for welded structures SM490A, and the like. H-section steel consisting of The H-shaped steel beam 5 includes an upper flange 50, a lower flange 51, and a web 52 that connects them.

(Thickness diaphragm)
The through-thickness diaphragm 6 according to the present embodiment is made of a steel plate having a cross shape in plan view and having a strength comparable to that of the steel columns 2 and 3 and the H-shaped steel beam 5 such as a rolled steel material for building structures. A plurality of bolt holes (not shown) for bolting 5 are formed. For this reason, the H-shaped steel beam 5 can be directly bolted to the thick-walled diaphragm 6, and the beam bracket required in the prior art becomes unnecessary. Therefore, the conveyance efficiency of the steel columns 2 and 3 is improved.

  Of course, the through-thickness diaphragm according to the present invention may be made of a material such as steel, stainless steel, cast steel, or spheroidal graphite cast iron, or may be composed of other metals such as an aluminum alloy in addition to steel.

  The wall thickness refers to a through-diaphragm having a structure that is thicker than a general through-diaphragm, and that counteracts the stress caused by the difference in the tube diameter of the column with the rigidity and strength of the plate thickness. Specifically, the through-thickness diaphragm 6 is thicker (for example, twice or more) than the upper flange 50 and the lower flange 51 of the H-shaped steel beam 5 to be connected.

(Outer diaphragm)
The outer diaphragm 7 according to the present embodiment includes a divided diaphragm 70 divided into four parts, and these divided diaphragms 70 are connected by a bolt B as a joining member to form a rectangular frame-shaped diaphragm in plan view. .

  The bolt B (joining member) may be a bolt that can ensure a predetermined tension and can frictionally join a plurality of members. Generally, however, the tension is because the pin tail breaks when the predetermined tension is reached. A torcia type high strength bolt that can be easily managed is adopted (see FIG. 1 and the like). (Hereinafter, the bolt B refers to a member of a nut and a set, and the symbol B indicates the same configuration).

(Division diaphragm)
Next, the split diaphragm 70 and the outer diaphragm 7 will be described in detail with reference to FIGS. 4 and 5. FIG. 4 is a perspective view showing the split diaphragm 70 of the outer diaphragm 7 according to the first embodiment of the present invention, and FIG. 5 is an exploded plan view showing a state before the split diaphragm 70 is attached to the steel column 2. is there.

  As shown in FIGS. 4 and 5, the split diaphragm 70 is joined to a column plate 71 made of a steel plate for abutting against the side surface 20 of the steel column 2 and friction joining, and a lower flange 51 of the H-shaped steel beam 5. For example, a beam plate 72 made of a steel plate.

(Pillar plate)
As shown in FIG. 4, the column plate 71 is inclined by about 45 degrees in plan view in a direction in which both ends in the longitudinal direction of a rectangular steel plate that is long in the lateral direction (X direction in the drawing) are separated from the steel column 2. It is a bent member. As for this column plate 71, the flat flat part is the general part 71a, and the bent part is the tensile joining part 71b (refer also FIG. 5).

  In each of the tensile joint portions 71b, a total of four bolt holes 71c for inserting bolts B, which are joining members, are formed in a pair of upper and lower sides with the beam plate 72 interposed therebetween. The adjacent diaphragms 70 adjacent to each other through the bolt holes 71c are joined by bolts B, and the outer diaphragm 7 is configured.

  Further, as shown in FIGS. 5 and 2, the general portion 71 a has substantially the same width as the width of the side surface 20 of the steel column 2, and the contact surface on the side surface 20 side increases the friction coefficient. It is preferable that rough surface treatment (high friction coefficient treatment) is performed. Examples of the rough surface treatment include known blast treatment, coating treatment, metal spraying treatment, concavo-convex processing by knurling or cutting, and the like. Of course, the rough surface treatment may be rusting by conventional natural rusting.

  However, when a gap is generated between the column plate 71 and the side surface 20 of the steel column 2 due to an installation error or an accuracy error, the steel column 2 is formed in an H shape via a filler plate (not shown) for adjusting the gap. The steel beam 5 may be friction bonded. In short, regardless of whether or not the column plate 71 directly contacts the steel column 2, the outer diaphragm 7 is frictionally bonded to the side surface 20 by the surface pressure of the column plate 71 generated when the divided diaphragms 70 are bonded to each other by the bolt B. Any configuration can be used.

(Beam plate)
As shown in FIG. 4, the beam plate 72 is joined to the vicinity of the center of the column plate 71 in the vertical direction so that the plate surfaces of the column plate 71 and the beam plate 72 are orthogonal to each other. The corners of the joint portion between the column plate 71 and the beam plate 72 may be R-processed to prevent stress concentration.

  As shown in FIG. 2, the beam plate 72 is formed to have the same width as the flange of the H-shaped steel beam 5 to which the projecting end portion 72 a is joined, and gradually widens as the side 72 c approaches the steel column 2 in an arc shape. It is formed as follows. This is because the base end portion 72b, which is a rigid joint and has a large load of shearing force and bending stress, is wide. 4 and 5, the beam plate 72 has the widest width between the two tensile joints 71b.

  The beam plate 72 is provided with a plurality of bolt holes 72d through which the bolts B are inserted in order to frictionally join with the lower flange 51 of the H-shaped steel beam 5. In addition, as shown by a broken line in FIG. 4, the bolt hole 72 d may be a long hole that is long in the axial direction of the H-shaped steel beam 5. This is because the installation of the steel column 2 and the product error can be absorbed and the H-shaped steel beam 5 and the beam plate 72 can be bolted together by using the long hole.

  Then, the joint surface between the H-shaped steel beam 5 and the steel column 2 in the vicinity of the bolt hole 72d is subjected to a rough surface treatment (high friction coefficient increasing treatment) in order to increase the friction coefficient, as in the general portion 71a. Has been.

  The beam plate 72 is provided in accordance with the H-shaped steel beam 5 to be joined. Therefore, the steel column 2 is arranged along the corner of the building or along the outer wall, and the split diaphragm 70 installed on the side surface not connecting the H-shaped steel beam 5 is provided with only the column plate 71 and the beam plate 72 is provided. It does not have to be done.

  Next, the installation of the outer diaphragm 7 on the steel column 2 will be described with reference to FIG. FIG. 6 is a plan view showing a state before the split diaphragm 70 is fastened by the joining member. As described above, the tensile joint portions 71b are formed at both ends in the longitudinal direction (width direction: horizontal direction) of the column plate 71, and the width of the general portion 71a is substantially the same as the width of the side surface 20 of the steel column 2. It has become.

  For this reason, as shown in FIG. 6, before the divided diaphragms 70 are bolted together, the tensile joints 71b located at both ends in the longitudinal direction of the column plate 71 are located near the corners of the steel column 2. At the same time, the adjacent tensile joints 71b are substantially parallel to each other.

  Further, as shown in FIG. 6, before the tensile joint portions 71b are joined by bolts, the distance e between the tensile joint portions 71b of the divided diaphragm 70 is formed. The outer diaphragm 7 according to the present embodiment is designed so that at least the distance e satisfies e> 0.

  For this reason, when the adjacent tensile joint portions 71b are bolted together with the bolt B, the interval e is eliminated, and the entire frame of the outer diaphragm 7 is contracted, so that the column plate 71 and the side surface 20 of the steel column 2 are between. It is a mechanism that generates surface pressure. Thereby, the H-shaped steel beam 5 is frictionally joined to the steel column 2 via the outer diaphragm 7.

  As described above, the outer diaphragm 7 according to the embodiment of the present invention is equally divided into four at the corners of the steel column 2, that is, the outer diaphragm 7 is configured from four identically divided diaphragms 70. This has been illustrated and described. However, an outer diaphragm equally divided into four at the center of the side surface 20 of the steel column 2 may be used, or an outer diaphragm divided unevenly may be used. In addition, when the outer diaphragm is joined, the installation height of the diaphragm 70 is very easy to adjust.

  Further, instead of splitting the lower flange 51 of the H-shaped steel beam 5 with the outer diaphragm 7 to the steel column 2 as in the different-diameter beam-to-beam connection structure 1, the different-diameter column by dry bonding using a high-strength bolt is used. It is also possible to adopt a split tee joint that joins to a steel column 2 that is one of the beam joint structures via a split tee that is directly bolted (see reference numeral 7 'in FIG. 7).

  According to the different-diameter column beam joint structure 1 according to the first embodiment, a different-diameter column joint portion comprising a lower-tier steel column 2 having a large pipe diameter and an upper-grade steel column 3 having a smaller pipe diameter. 4, the through diaphragm passing through the steel columns 2 and 3 is only one of the thick through diaphragm 6. For this reason, unlike the conventional thick diaphragm type column beam connection structure, it is not necessary to once cut the steel column on the lower floor and weld the diaphragm and the connecting piece through the end portion. Further, unlike the tapered column-type beam-column connection structure, a tapered column which is a custom-made product that is difficult to obtain and expensive is not necessary. For this reason, cutting and processing of a steel column can be reduced and manufacturing cost can be held down.

  Further, according to the different-diameter column beam joining structure 1, since the upper flange 50 of the H-shaped steel beam 5 is bolted to the thick-walled diaphragm 6, the H-shaped steel beam 5 and the thick-thickness diaphragm 6 are connected on site. There is no need to weld. For this reason, the work time of the construction work can be shortened by eliminating the welding on site.

  In addition, according to the different-diameter column beam joint structure 1, the lower flange 51 of the H-shaped steel beam 5 is frictionally joined to the steel column 2 by the surface pressure by fastening the split diaphragm 70 with the bolt B. The installation height of the diaphragm 70 can be adjusted. Therefore, it is possible to easily cope with errors in construction of the steel column 2 and the H-shaped steel beam 5 and errors due to product warpage or twisting. For this reason, the work time of the construction work can be greatly shortened, and the installation cost can be reduced.

[Second Embodiment]
Next, a different-diameter column beam joint structure according to a second embodiment of the present invention will be described with reference to FIGS. FIG. 7 is a perspective view showing a different-diameter column beam joint structure according to a second embodiment of the present invention. FIG. 8 is a plan view of the different-diameter column beam joint structure of FIG. 9 is a side view of the different-diameter column beam joint structure of FIG. 7 viewed horizontally. The different-diameter column beam joint structure 1 ′ according to the second embodiment is different from the different-diameter column beam joint structure 1 according to the first embodiment described above in that the thickness of the diaphragm and the outer diaphragm are vertically aligned. It was just the opposite. Therefore, the difference will be mainly described. The same components are denoted by the same reference numerals, and description thereof will be omitted.

  Similar to the above-mentioned different-diameter column-beam joint structure 1, the different-diameter column-beam joint structure 1 ′ according to the second embodiment of the present invention has a lower-diameter steel column 2 ′ having a large pipe diameter and a tube diameter larger than that. A plurality of H-shaped steel beams 5 made of H-section steel are joined in a different-diameter column joint portion 4 ′ composed of a small upper steel column 3 ′.

  Further, the steel column 2 ′ and the steel column 3 ′ are welded and joined via a thick diaphragm 6 described later. However, in the different-diameter column-beam joint structure 1 ′, the position where the thick-walled diaphragm 6 is welded is shifted downward by the beam component of the H-shaped steel beam 5 connected to the different-diameter column-beam joint structure 1. . That is, the lower flange 51 of the H-shaped steel beam 5 is fastened and joined to the diaphragm 6 by the bolt B, and the upper flange 50 of the H-shaped steel beam 5 is frictionally joined to the steel column 2 via the outer diaphragm 7. ing.

  The steel column 2 'is different in length from the steel column 2 described above, and the steel column 3' is only different in length from the steel column 3 described above, so that the steel column 2 'and the steel column 3' Detailed description is omitted.

  According to the different-diameter column-beam joint structure 1 ′ according to the second embodiment, similarly to the different-diameter column-beam joint structure 1, in the different-diameter column joint portion 4 ′ composed of the steel column 2 ′ and the steel column 3 ′, The through-diaphragm passing through the steel columns 2 ′ and 3 ′ is only one of the thick-walled diaphragms 6. For this reason, unlike the conventional thick diaphragm type column beam connection structure, it is not necessary to once cut the steel column on the lower floor and weld the diaphragm and the connecting piece through the end portion. Further, unlike the tapered column-type beam-column connection structure, a tapered column which is a custom-made product that is difficult to obtain and expensive is not necessary. For this reason, cutting and processing of a steel column can be reduced and manufacturing cost can be held down.

  Further, according to the different-diameter column beam joining structure 1 ', the lower flange 51 of the H-shaped steel beam 5 is bolted to the thick-walled diaphragm 6, so that the H-shaped steel beam 5 and the thick-thickness diaphragm 6 are connected to the site. There is no need to weld with. For this reason, the work time of the construction work can be shortened by eliminating the welding on site.

  In addition, according to the different-diameter column beam joint structure 1 ′, the upper flange 50 of the H-shaped steel beam 5 is frictionally joined to the steel column 3 ′ with its surface pressure by fastening the split diaphragm 70 with the bolt B. The installation height of the split diaphragm 70 can be adjusted. Accordingly, it is possible to easily cope with errors in construction of the steel column 2 'and the H-shaped steel beam 5, and errors due to product warpage and twisting. For this reason, the work time of the construction work can be greatly shortened, and the installation cost can be reduced.

  Furthermore, according to the different-diameter column beam joint structure 1 ′, when installing the H-shaped steel beam 5, it is only necessary to adjust the position of the H-shaped steel beam 5 and place it on the thick-walled diaphragm 6. . Therefore, when the H-shaped steel beam 5 is installed in the different-diameter column beam joint structure 1, the H-shaped steel beam 5 is kept lifted by the lifting machine until the temporary fixing of the H-shaped steel beam 5 with the bolt B is finished. Compared with the need to hold in this state, the working efficiency is improved at each stage.

<Manufacturing method of different diameter column beam joint structure>
Next, the manufacturing method of the different diameter column beam junction structure which concerns on embodiment of this invention is demonstrated using FIGS. An example of manufacturing the above-mentioned different-diameter column beam joint structure 1 will be described.

(1) Steel column installation process In the manufacturing method of the different diameter column beam connection structure concerning this embodiment, first, the steel column installation process which installs the steel column 2 is performed. At this time, a predetermined number of steel pillars 2 are installed.

  Specifically, the steel column 2 is sequentially installed at a predetermined position marked in advance. When the steel column is carried into the construction site, the thick diaphragm 6 is welded to the top of the steel column 2, and the steel column 3 is further welded thereon. For this reason, compared with the conventional taper column type or thick diaphragm type different diameter column beam connection structure, since the beam bracket Hb does not protrude, the package shape is arranged and the carrying efficiency is good.

(2) H-shaped steel beam installation process Next, in the manufacturing method of the different-diameter column beam joining structure which concerns on this embodiment, the H-shaped steel beam installation process which installs the H-shaped steel beam 5 is performed.

  Specifically, at the loading place of the H-shaped steel beam 5, the divided diaphragm 70 is bolted in advance to the end of the H-shaped steel beam 5 before being lifted and lifted by the lifting machine of the H-shaped steel beam 5. Thereafter, the H-shaped steel beam 5 is lifted by a lifting machine and is bridged between the steel column 2 and the other steel column 2, and the upper flange 50 of the H-shaped steel beam 5 is bolted to the diaphragm 6 and fastened. .

  At this time, since the split diaphragm 70 is previously bolted to the H-shaped steel beam before being lifted by the lifting machine, the time for unloading the split diaphragm 70 by the lifting machine can be omitted. For this reason, the work time of the construction method of a steel frame can be shortened, and installation cost can be reduced further.

(3) Non-divided Diaphragm Joining Step Next, in the manufacturing method of the different-diameter column beam joining structure according to the present embodiment, the divided diaphragms 70 are bolted together with bolts B, and the steel column 2 is joined to the steel column 2 with the outer diaphragm 7. A non-divided die joining step for frictionally joining the beams 5 is performed.

  Specifically, the bolt B is tightened to a predetermined tension with an impact wrench or the like, and the divided diaphragms 70 are bolted together to generate a surface pressure between the side surface 20 of the steel column 2 and the column plate 71, The H-shaped steel beam 5 is friction bonded to the steel column 2.

  At this time, the outside-division die-joint has a high degree of freedom in the height direction and the like with respect to the steel column 2, and the position adjustment is very easy.

  According to the manufacturing method of the different-diameter column beam joint structure according to the present embodiment, since the split diaphragm 70 is bolted to the H-shaped steel beam 5 in advance before being lifted by the lifting machine, the split diaphragm 70 is used by the lifting machine. The time for unloading can be omitted. For this reason, the work time of the construction method of a steel frame can be shortened, and installation cost can be reduced further. Moreover, it is not necessary to adjust the position with extremely high accuracy such as inserting an H-shaped steel beam between the outer diaphragms, and the work time for constructing the steel frame can be shortened.

  As described above, the different-diameter column-beam joint structures 1 and 1 ′ and the manufacturing method thereof according to the embodiment of the present invention have been described in detail. However, any of the above-described or illustrated embodiments has been embodied in carrying out the present invention. It is merely an embodiment. Therefore, the technical scope of the different-diameter column beam joint structure according to the present invention should not be construed in a limited manner.

1, 1 ': Different diameter column beam connection structure 2, 3, 2', 3 ': Steel column (column)
20, 30: Side surface 4, 4 ': Different diameter column joint part 5: H-shaped steel beam (beam)
50: Upper flange (flange)
51: Lower flange (flange)
52: Web 6: Thickness diaphragm 7: Outer diaphragm 7 ': Split tee 70: Split diaphragm 71: Column plate 71a: General part 71b: Tensile joint 71c: Bolt hole 72: Beam plate 72a: Projection end 72b: Base End 72c: Side 72d: Bolt hole B: Bolts C1, C2, C1 ′, C2 ′: (Conventional) steel column (column)
C3: Tapered column C4: Connection pieces D1, D2, D1 ′, D2 ′: Through diaphragm D3: Thick diaphragm Hb: Beam brackets F1, F2: Flange W: Web

Claims (5)

It is a different-diameter beam-to-beam connection structure by dry bonding using high-strength bolts between different-diameter columns with different thickness dimensions of steel columns.
Either the upper flange or the lower flange of the H-shaped steel beam is joined via a through diaphragm welded by dividing the steel column up and down, and the other is directly bolted to the steel column. It is joined by split tee joining that joins through split tees, or split outer diajoining that frictionally joins with the side pressure of the steel column through a split diaphragm in which the outer diaphragm is divided into a plurality of parts,
In addition, the through diaphragm is a thick through diaphragm that is thicker than a flange thickness of the H-shaped steel beam to be joined, and the flange of the H-shaped steel beam is bolted to the thick through diaphragm. Different diameter column beam connection structure. Either the upper flange or the lower flange of the H-shaped steel beam is joined by the non-divided die-joint, and the steel column is a column column having a square cross section.
The split diaphragm is configured such that a joint surface between the split diaphragms is disposed in the vicinity of a corner portion of the column column, and the joint surface is fastened to each other by a joint member, thereby generating a surface pressure between the side surfaces of the steel column. The said H-shaped steel beam is made to friction-join between the said different diameter pillars, The different diameter column beam joining structure of Claim 1 characterized by the above-mentioned. The other flange of the H-shaped steel beam is joined to the steel column by split outer diajoining via the split diaphragm previously bolted before being lifted by a lifting machine. Or the different-diameter column beam connection structure of 2. It is a manufacturing method of the different diameter column beam junction structure according to any one of claims 1 to 3,
The thick-diameter diaphragm and one flange of the H-shaped steel beam are joined by bolting, and the other flange of the H-shaped steel beam is joined by split tee joining or split outer diaphragm joining. Manufacturing method of beam joint structure. The other flange of the H-shaped steel beam is joined to the steel column via the split diaphragm by a split outer diajoin,
The method for manufacturing a joint structure with different diameter columns and beams according to claim 4, wherein the H-shaped steel beam is bolted to the split diaphragm before being lifted by a lifting machine.

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