JP2012021368A - Beam joint structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a beam joint structure capable of maintaining a flat and simple outer peripheral surface and resisting against tensile forces from beams while effectively strengthening the beam joint at the beam joint structure of a column consisting of a steel pipe.SOLUTION: A plurality of L-shaped angle steels 20 are arranged at a predetermined interval between adjacent ones inside a steel pipe 10. At a gap part 25 formed between two adjacent L-shaped angle steels 20, the two adjacent L-shaped angle steels 20 and an inner peripheral surface Fof the steel pipe 10 are integrally welded and joined to strengthen a beam joint 30 of a column 1. As no complicated shape such as protrusion is formed on the outer peripheral surface Fof the steel pipe 10, a flat and simple shape is obtained, and an outer wall, a fireproof coating, an interior and the like can be mounted around the beam joint 30 of the column 1 in a well-settled manner.

Description

  The present invention relates to a beam joint structure in a column formed using a steel pipe.

  Conventionally, when a beam formed using H-shaped steel is joined to a column formed using a square steel pipe, when these joints are to be rigidly joined, field welding is performed at the construction site. It was. This type of welding operation requires advanced technology and skill, and quality control is not easy. For this reason, various attempts have been made to bolt the beam to the column. However, since the column is made of a steel pipe with a closed cross-section, not an H-section steel or the like, the operator's hand is placed inside the column. It is difficult to put in and work, and it is necessary to devise such as pre-installing nuts in the pillars, which complicates the structure. Moreover, in order to increase the proof stress of the part (beam junction part) where the beam in a pillar is joined, it is necessary to consider the reinforcement of the said part of a pillar.

  In order to solve such a problem, for example, in the configuration of Patent Document 1, angle materials are stacked at the four corners of the outer periphery of a square steel pipe forming a column, and the adjacent angle members and the outer peripheral surface of the square steel pipe are integrated. The beam joint is reinforced by welding to the joint. Then, when joining the beam to the column, a configuration is adopted in which the end plate provided at the end of the beam is brought into contact with the beam joint, and the beam joint and the end plate of the beam are bolted with a one-side bolt. ing.

JP 07-331747 A

  However, in the configuration of Patent Document 1, since the angle member that reinforces the beam joint is attached to the outer surface of the square steel pipe, when the member such as the outer wall, the fireproof coating, or the interior member is attached to the column, the beam It is necessary to consider the protrusion of the angle member forming the joint, and this causes a problem that the housing of the outer wall and the like around these beam joints becomes complicated. In addition, since the welded part for attaching the angle material to the beam joint is provided outside the steel pipe, if the angle material is deformed so as to swell due to the tensile force applied from the beam, the welded part The tensile force acts between the angle members. Since the proof stress of the welded portion is generally inferior to the tensile force rather than the compressive force, there is a problem that it is difficult to expect a sufficient proof strength against pulling from the beam in the configuration as in Patent Document 1.

  Accordingly, the present invention has been made to solve such a problem, and in a beam joint portion of a column constituted by a steel pipe, while maintaining a flat and simple outer peripheral surface, against the tensile force from the beam. It is an object of the present invention to provide a beam joint structure that can be effectively reinforced.

  In order to solve the above-mentioned problems, a beam joint structure according to the present invention is a beam joint structure in which a beam joint for joining a beam to a column constituted by a steel pipe is provided, and is in contact with the inner peripheral surface of the steel pipe. A plurality of core reinforcement hardware accommodated adjacent to each other in the steel pipe, and the core reinforcement hardware forms a gap between adjacent core reinforcement hardware, Is characterized in that a welded joint is formed by integrally welding adjacent core reinforcing hardware and the inner peripheral surface of the steel pipe.

  According to the present invention, since the core reinforcement hardware that reinforces the beam joint is housed in the steel pipe, the outer periphery of the steel pipe does not cause a bulge or the like accompanying the reinforcement of the beam joint, Thus, the outer wall, the fireproof coating, the interior, etc. can be provided well around the beam joint. In addition, the core reinforcement hardware accommodated in the steel pipe in contact with the inner peripheral surface of the steel pipe is welded and joined between adjacent ones and the inner peripheral surface of the steel pipe. When a tensile force of 1 acts on the beam joint, a compressive load from the core reinforcement hardware acts on the weld joint between adjacent core reinforcement hardware. Since the welded joint is stronger against the load in the compression direction than in the tensile direction, the proof strength of the welded joint can be improved by performing the weld joint of the core reinforcing metal on the inner peripheral surface side of the steel pipe. As described above, according to the beam joint portion of the column formed of the steel pipe, it is possible to maintain a flat and simple outer peripheral surface and to effectively reinforce the tensile force from the beam.

  Furthermore, according to the present invention, by welding the gap formed between the core reinforcement hardware, the core reinforcement hardware and the steel pipe can be integrated, and the strength and rigidity of the beam joint in the column are improved. be able to. More specifically, since the core reinforcing metal pieces arranged adjacent to each other are in a state of being joined to each other in a state such as butt welding via a welded joint, the compressive force acting on one core reinforcing metal The tensile force is transmitted to the adjacent core reinforcing hardware through the weld joint. That is, the compressive force and tensile force are received by a plurality of core reinforcing hardware, and the strength against these loads is improved. In addition, it can be considered that the core reinforcing metal and the steel pipe are welded and joined by fillet welding, and the core reinforcing metal arranged adjacent to the core reinforcing metal is in the middle. By welding together with the child reinforcement hardware, the fillet weld is reinforced. Therefore, even when a shearing force that causes a deviation from the steel pipe acts on one core reinforcing metal, the strength is significantly higher than that of a structure in which one core reinforcing metal and a steel pipe are simply welded to the fillet. Can be improved.

  Moreover, as for a core reinforcement metal fitting, it is preferable that a groove | channel is formed in the side edge part which forms a space | gap part. By forming the groove in this way, it is possible to easily perform welding joining between the core reinforcing hardware and the steel pipe.

  Further, the steel pipe is a square tube-shaped square steel pipe having four corners and a flat plate part connecting the corners, and each core reinforcing metal fitting is attached to each of the adjacent flat plate parts across the corner part. It is preferable that the cross section is formed in an L-shape capable of contacting. For example, if one core reinforcement metal fitting is to be brought into good contact with all of the three flat plate portions of the square steel pipe and the inner peripheral walls of the four flat plate portions, it is necessary to form the core reinforcement metal fitting or the steel pipe very finely. Not only does this occur, but the work of inserting the core reinforcement hardware into the steel pipe becomes extremely difficult. Therefore, in the present invention, each core reinforcing metal piece has an L-shaped cross section so as to be in contact with two surfaces of the flat plate portion of the adjacent square steel pipe with the corner portion interposed therebetween. The inner peripheral surface of the steel pipe can be securely adhered. Further, the core reinforcing metal can be easily inserted into the steel pipe. In addition, since the core reinforcement hardware is arranged so as to overlap each corner of the steel pipe, it becomes difficult to interfere with other core reinforcement hardware when arranging one core reinforcement hardware, and the core reinforcement Hardware can be easily installed.

  Further, the steel pipe is provided with a plurality of through holes through which bolts for connecting the beams to bolts can be inserted in a portion that accommodates the core reinforcing hardware, and the core reinforcing hardware corresponds to the through holes of the steel pipe. It is preferable that a screw hole to be screwed into the bolt is provided at the position. In this case, the beam is fastened to the core reinforcement hardware via the bolt. In addition, since the core reinforcement hardware is welded to the adjacent core reinforcement hardware and the inner peripheral surface of the steel pipe via the welded joint, the load acting on the portion fastened by the bolt receives the bolt. It is transmitted well not only to the core reinforcement hardware but also to the adjacent core reinforcement hardware and the steel pipe. For this reason, this structure has a remarkably large reinforcing effect as compared with a structure in which the core reinforcing metal is fixed to the steel pipe by, for example, screws or spot welding, and realizes a structure of a beam joint that increases proof stress and rigidity. be able to.

  ADVANTAGE OF THE INVENTION According to this invention, in the beam connection part of the column comprised with the steel pipe, effective reinforcement can be performed with respect to the tensile force from a beam, maintaining a flat and simple outer peripheral surface.

It is a perspective view which shows the joining state of the pillar which has the beam junction part structure which concerns on one Embodiment of this invention, and a beam. It is a partially broken figure which shows the structure around the beam junction part of a column. It is sectional drawing which cut | disconnects and shows a beam junction part along the direction orthogonal to the axis line of a pillar.

  Preferred embodiments of the present invention will be described below with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a perspective view showing a joined state between a column and a beam. As shown in FIG. 1, the beam 5 is brought into contact with the beam joint portion 30 of the column 1, and the column 1 and the beam 5 are bolted using a bolt 2 and a nut 3.

  The beam 5 includes a beam main body 51 made of H-shaped steel in which a pair of flanges 51 a and 51 b are connected by a web 51 c, and a thick plate-like end that is provided at both ends of the beam main body 51 and contacts the beam joint 30. Plate 50. The end plate 50 is provided with eight through holes 50a through which the bolts 2 can be inserted. The through holes 50a are vertically divided into two rows with the web 51c of the beam main body 51 as the axis of symmetry to form a hole row 50b. is doing.

The pillar 1 is provided with a steel pipe 10 erected on a foundation (base) or the like. The steel pipe 10 is composed of a square tubular square steel pipe having four corner portions 16 and a flat plate portion 17 positioned between the corner portions 16. Inside the steel pipe 10, four L-shaped angles (core reinforcement fittings) 20 are provided in contact with the inner peripheral surface F ₁ of the steel pipe 10 (see FIGS. 2 and 3). A portion where the L-shaped angle 20 is accommodated in the steel pipe 10 and the four L-shaped angles 20 constitute a beam joint portion 30 for joining the beam 5 to the column 1.

  Further, each flat plate portion 17 of the steel pipe 10 is provided with a plurality of through holes 11 through which the bolts 2 for joining the beams 5 are inserted at positions where the beam joint portions 30 are formed, and a sinus hole 12 is provided. ing. When the beam 5 is joined to the beam joint 30, the sino-hole 12 is provided for laying a bar member that maintains the beam joint facing posture of the beam 5 across the beam 5 and the beam joint 30. It is what Further, in the present embodiment, two rows of hole rows 13 that are opposed to the through holes 50 a of the end plate 50 of the beam 5 are provided in each flat plate portion 17. Each hole row 13 is constituted by four holes 11 and 12 that are vertically arranged when the steel pipe 10 is erected, and among these four holes 11 and 12, the uppermost stage, the second stage, The lowermost hole is the through hole 11, and the third hole is the sino hole 12.

Next, details of the structure around the beam joint 30 will be described. FIG. 2 is a partially cutaway view showing a structure around a beam joint of a column, and FIG. 3 is a cross-sectional view showing the beam joint cut along a direction orthogonal to the axis of the column. In FIG. 2, a part of the steel pipe 10 is shown broken away in order to show the internal structure of the pillar 1. FIG. 2 shows a state before welding the adjacent L-shaped angles 20 to each other and the inner peripheral surface F ₁ of the steel pipe 10. Further, in order to show the structure of the L-shaped angle 20, one L-shaped angle is shown. 20 is drawn out from a predetermined arrangement position.

  As shown in FIGS. 2 and 3, the L-shaped angle 20 includes a corner portion 26 facing the inside of the corner portion 16 of the steel pipe 10, and a pair of flat plate-like arm portions adjacent to each other with the corner portion 26 interposed therebetween. 27 and formed in an L-shaped cross section. Further, the L-shaped angle 20 is formed thicker than the steel pipe 10, and the through holes 11 of the steel pipe 10 are provided in the arm portions 27 in a state where the L-shaped angle 20 is disposed at a predetermined position inside the steel pipe 10. Are provided with screw holes 21 that are screwed into the bolts 2, and further, are provided with sinus holes 22 at positions corresponding to the nose holes 12 of the steel pipe 10. Each arm 27 is provided with a groove 23 formed by chamfering the side edge 28 obliquely on a side edge 28 opposite to the corner 26.

Each L-shaped angle 20 has a corner portion 26 opposed to the inside of the corner portion 16 of the steel pipe 10 and a pair of arm portions 27 in contact with the inner peripheral surface F ₁ of each flat plate portion 17 of the steel pipe 10. It is accommodated inside the steel pipe 10. Further, the pair of arm portions 27 of each L-shaped angle 20 is formed to have a size smaller than at least half the width of the flat plate portion 17 of the steel pipe 10. Thereby, a predetermined space (gap 25) is formed between adjacent L-shaped angles 20, and when the L-shaped angles 20 are arranged inside the steel pipe 10, the L-shaped angles 20 are mutually connected. It does not interfere.

  Further, each L-shaped angle 20 is accommodated with respect to the steel pipe 10 in a state where the corner portion 26 is opposed to the inside of the corner portion 16 of the steel pipe 10. One arm portion 27 of the L-shaped angle 20 and the other arm portion 27 of the L-shaped angle 20 adjacent to the one L-shaped angle 20 are in contact with each other, and the gap portion 25 is formed at the central portion of the flat plate portion 17. It is formed between the arm portions 27. In addition, by accommodating the L-shaped angle 20 in this way, one of the two rows of hole rows 13 of each flat plate portion 17 has one arm portion 27 of one L-shaped angle 20 in one hole row 13. The holes 11 and 12 are opposed to each other, and the holes 11 and 12 of the other arm portion 27 of the L-shaped angle 20 adjacent to the one L-shaped angle 20 are opposed to the other hole row 13. As shown in FIGS. 1 and 2, two rows of bolt joints are formed by bolting the beam 5 to the beam joint 30, but the gap portion 25 has two rows of bolts. It is located between the joints (see FIG. 3).

Further, the radius of curvature of the corner portion 26 of the L-shaped angle 20 is larger than the radius of curvature of the corner portion 16 of the steel pipe 10. Thus, each of the inner peripheral surface F ₁ of the flat plate portion 17 of the steel pipe 10 adjacent to each other across the corner portion 16, a pair of arms of L-shaped angles 20 which is accommodated by the corner portion 26 is opposed to the corner portion 16 The part 27 can be brought into contact with certainty.

In addition, each gap portion 25 (see FIG. 3) formed between the adjacent L-shaped angles 20 is welded in a state where the gap portion 25 is filled. Are formed with a weld joint 40 that integrally welds adjacent L-shaped angles 20 and the inner peripheral surface F ₁ of the flat plate portion 17 of the steel pipe 10. In addition, since the groove 23 is formed in the side edge part 28 of the arm part 27 of the L-shaped angle 20 which forms the gap | interval part 25, welding work can be performed easily.

As a result, the four L-shaped angles 20 are arranged inside the steel pipe 10 in a state where the pair of arm portions 27 are in contact with the inner peripheral surface F ₁ of the steel pipe 10, and adjacent L-shaped angles 20. and the inner peripheral surface F ₁ of the flat plate portion 17 between the steel pipe 10 is welded together, beam 30 backed reinforced by L-shaped angles 20 are formed.

  Next, a procedure for joining the beam 5 to the column 1 will be described. First, the end plate 50 of the beam 5 is brought close to the beam joint 30 of the pillar 1 that is erected. Next, the end plate 50 is brought into contact with the beam joint portion 30 in a state where a bar is inserted into the third through hole 50a from the top of the hole row 50b of the end plate 50 and the syno hole 12 of the column 1. The through holes 50a of the end plate 50 and the holes 11 and 12 of the pillar 1 are made to face each other. Next, one end of the bolt 2 is inserted into the through hole 50a from the back side of the end plate 50 (the side opposite to the side in contact with the column 1), and the one end of the bolt 2 and the screw hole 21 of the L-shaped angle 20 are screwed together. Let In the present embodiment, a one-side bolt in which a forward screw and a reverse screw are engraved at both ends is used as the bolt 2. Next, the nut 3 is screwed into the other end of the bolt 2 and the nut 3 is tightened, whereby the beam 5 is joined to the column 1.

The present embodiment is configured as described above, and the L-shaped angle 20 that reinforces the beam joint 30 is accommodated in the steel pipe 10, so that the outer peripheral surface F ₂ of the steel pipe 10 is the beam joint 30 and the other parts. is maintained flush state with the site, without occurs complicated shape such as a ledge on the joints 30 and the outer peripheral surface F ₂ of the surrounding outer wall Ya around a the beam Connection 30 Fireproof coating, interior, etc. can be stored well.

The tensile force from the beam 5 acts on the beam joint 30 of the column 1 via the bolt 2. At this time, the tensile force from the beam 5 acts on the flat plate portion 17 of the beam joint portion 30 facing the beam 5, and the center portion is bent outward with the corner portions 16 on both sides as fixed ends. A load causing deformation is applied. Here, the weld joint 40 formed on the flat portion 17 joined the L-shaped angles 20 adjacent, are also bonded to the inner peripheral surface F ₁ of the steel pipe 10, high remarkable stiffness, such tension Displacement due to force is extremely difficult to occur. Further, even if though the flat-plate portion 17 plane deformation according to have gone occurred, since L-shaped angles 20 on the inner peripheral surface F ₁ of the steel pipe 10 is welded by the weld joint 40, the The welded joint 40 is displaced outward with the out-of-plane deformation of the flat plate portion 17, and accordingly, receives a load in the compression direction from the adjacent L-shaped angle 20. In general, the welded joint portion is more resistant to a load in the compressive direction than a load in the tensile direction, and thus a compressive force acts on the welded joint 40, but this does not cause immediate destruction. That is, by performing the welding of the L-shaped angles 20 at the inner peripheral surface F ₁ side of the steel pipe 10, it becomes to be improved strength of the weld joint 40. In contrast to the tensile force, when a compressive force is applied to compress the steel pipe 10 from the beam 5, the flat plate portion 17 is pressed over the entire surface of the end plate 50 provided on the beam 5. The steel pipe 10 or the L-shaped angle 20 that receives the heat does not cause a large displacement locally, and the welded joint 40 is hardly overloaded. As described above, according to the structure of the beam joint portion 30 of the column 1 constituted by the steel pipe 10, while maintaining the flat and simple outer peripheral surface F ₂ , effective reinforcement against the tensile force from the beam 5. Will be done.

  Moreover, according to this embodiment, the L-shaped angle 20 and the steel pipe 10 can be easily integrated by welding the gap portion 25 formed between the L-shaped angles 20, and the beam joint portion in the column 1. The strength and rigidity of 30 are improved. More specifically, since the L-shaped angles 20 arranged adjacent to each other are in a state of being joined to each other in a state such as butt welding via the weld joint 40, the compressive force acting on one L-shaped angle 20. The tensile force is transmitted to the adjacent L-shaped angle 20 via the weld joint 40. That is, the compression force and the tensile force are received by the plurality of L-shaped angles 20, and the strength against these loads is improved. The one L-shaped angle 20 and the steel pipe 10 can be considered to be welded together by fillet welding, and the L-shaped angle 20 arranged adjacent to the one L-shaped angle 20 is the one. By welding together with the L-shaped angle 20, the fillet weld is reinforced, and even if a shearing force that causes a deviation from the steel pipe 10 acts on the one L-shaped angle 20, it is simply one. Compared to the fillet welded construction of the L-shaped angle 20 and the steel pipe 10, the proof stress is remarkably improved.

Further, for example, if one reinforcing member having a shape different from that of the L-shaped angle 20 is to be satisfactorily brought into contact with all the three flat plate portions 17 and four flat plate portions 17 of the steel pipe 10, the reinforcing member or the steel pipe is very elaborated. 10 need not be formed, and the operation of inserting the reinforcing member into the steel pipe 10 becomes extremely difficult. On the other hand, in the present embodiment, as described above, the L-shaped angle 20 has an L-shaped cross section, and is in contact with the two surfaces of the flat plate portion 17 of the adjacent steel pipe 10 with the corner portion 16 interposed therebetween. The arm portion 27 of the character angle 20 and the inner peripheral surface F ₁ of the flat plate portion 17 of the steel pipe 10 are securely in close contact with each other, and the L-shaped angle 20 can be easily inserted into the steel pipe 10. In addition, since the corner portions 26 of each L-shaped angle 20 are arranged so as to overlap each corner portion 16 of the steel pipe 10 and the adjacent L-shaped angles 20 are arranged with a predetermined interval therebetween, When one L-shaped angle 20 is arranged, it becomes difficult to interfere with other L-shaped angles 20, and the installation of the L-shaped angle 20 becomes easy. Furthermore, by simply aligning the corner portion 26 of the L-shaped angle 20 with the corner portion 16 of the steel pipe 10, adjacent arm portions 27 are adjacent to each other via the corner portion 16 of the steel tube 10. Since it can be made to contact each of the flat plate part 17, installation of the L-shaped angle 20 becomes easy.

In addition, for example, a cold-formed square steel pipe can be used as the steel pipe 10, but in the case of a cold-formed square steel pipe, generally, a seam portion (of the steel pipe 10 is formed in the central portion of the flat plate portion 17 along the axial direction of the steel pipe 10. Protruding weld marks that occur during formation) are generated. However, as shown in the above embodiment, by providing the gap portion 25 between the adjacent L-shaped angles 20, the seam portion can escape into the gap portion 25, and the arm portion 27 of the L-shaped angle 20 can be removed. it can be reliably brought into close contact with the inner peripheral surface F ₁ of the flat plate portion 17 of the steel pipe 10.

Further, since the screw hole 21 is provided in the L-shaped angle 20, when the beam 5 is joined to the beam joint portion 30 of the column 1, the bolt 2 is screwed into the screw hole 21 of the L-shaped angle 20 to be bolted. be able to. Further, L-shaped angles 20, because it is welded to the inner peripheral surface F ₁ of the L-shaped angles 20 and steel pipe 10 adjacent to each other via a weld joint 40, the load acting on the site that is fastened by a bolt 2 Not only the L-shaped angle 20 that receives the bolt 2 but also the adjacent L-shaped angle 20 and the steel pipe 10 are transmitted well. For this reason, the said structure has a remarkably big reinforcement effect compared with what fixes the L-shaped angle 20 by a screw | thread or spot welding, for example.

  As mentioned above, although preferred embodiment of this invention was described, this invention is not limited to this. For example, although the steel pipe 10 is a square cylinder, it may be a triangular cylinder or other shapes. The shape of the L-shaped angle 20 may also be, for example, a triangular cross section or other shapes. Alternatively, only the portion of the L-shaped angle 20 where the screw hole 21 is formed may be thicker than the other portions, and a large number of screw grooves in the screw hole 21 may be secured. In the present embodiment, the pair of arm portions 27 of the L-shaped angle 20 exemplify those having the same length, but the length of the pair of arm portions 27 may be different. Moreover, even if it is a case where a beam is weld-joined to a beam junction part, the structure of this invention can be employ | adopted.

DESCRIPTION OF SYMBOLS 1 ... Column, 2 ... Bolt, 10 ... Steel pipe, 11 ... Through-hole, 16 ... Corner part, 17 ... Flat plate part, 20 ... L-shaped angle (core reinforcement metal), 20a ... Corner | angular part, 20b ... Arm part, 21 ... screw hole, 23 ... groove, 25 ... gap, 30 ... beam, 50 ... beam, the inner circumferential surface of the F 1 _... steel pipe.

Claims (4)

A beam joint structure in which a beam joint for joining a beam to a column constituted by a steel pipe is provided,
A plurality of core reinforcement hardware accommodated in a state adjacent to the steel pipe in a state of being in contact with the inner peripheral surface of the steel pipe,
The core reinforcement hardware forms a gap portion between adjacent core reinforcement hardware, and the adjacent core reinforcement hardware and the inner peripheral surface of the steel pipe are integrally welded to the gap portion. A welded joint structure characterized in that a welded joint is provided.   The beam joint structure according to claim 1, wherein a groove is formed in a side edge portion of the core reinforcing hardware that forms the gap portion. The steel pipe is a rectangular tubular steel pipe having four corners and a flat plate part connecting the corners,
3. The beam joint portion according to claim 1, wherein each core reinforcing hardware is formed in an L-shaped cross section that can contact each of the flat plate portions adjacent to each other with the corner portion interposed therebetween. Construction. The steel pipe is provided with a plurality of through holes into which bolts for bolting the beam can be inserted into a portion that accommodates the core reinforcing hardware,
4. The screw hole to be screwed into the bolt is provided in the core reinforcing hardware at a position corresponding to the through hole of the steel pipe. Beam joint structure.

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