JP4108089B2 - Column-to-beam joint and joining method - Google Patents

Description

  The present invention relates to a joining portion and a joining method for suspending and supporting an end portion of a beam from the upper side when joining the end portion of the beam to a column via a joint metal.

  As shown in FIG. 9, as a conventional connecting portion between a column and a beam, a reinforcing bar 92 is passed through a column 91, the reinforcing bar is bonded to the column with an adhesive 93, and the beam is attached to the end of the reinforcing bar protruding from the column. A structure in which the insertion hole 95 on the end face 94 is inserted and connected with an adhesive is widely known as an example.

  This joint structure is filled with adhesive without any gap between the reinforcing bar and the wood, so it has high rigidity against the rotational force of the beam in the event of an earthquake, and the reinforcing bar is not exposed on the surface of the column or beam. However, there is a problem. For example, in order to cure the adhesive while supporting the beam horizontally, the support member must be assembled and, of course, must be removed after curing. In addition, the adhesive must be cured until it is cured, and the construction period at the construction site becomes long. In addition, it is difficult to control the temperature and humidity in order to cure the adhesive stably.

In addition, as another example of the joint between the column and the beam, there is a structure using a joint hardware. For example, fixing the joint metal to the side of the column with bolts and nuts, placing the end of the beam on the bottom plate of the joint metal, inserting the core plate rising from the bottom plate into the beam, and covering the top surface of the beam with the lid plate, This is a structure in which a bolt protruding from a core plate passes through a lid plate and is tightened with a nut (Patent Document 1).
Registered Utility Model No. 3031391

  Although this structure does not use an adhesive and the joining is completed by tightening bolts and nuts, construction is easy, but there are the following problems. For example, the bottom plate of the joint hardware is exposed on the bottom surface of the beam, and the bolt head and nut are exposed on the side surface of the beam, so that the design is greatly impaired. Moreover, since the said structure has only the volt | bolt screwed in the pillar, the attachment strength of a volt | bolt is weak compared with the case where an adhesive agent is used. Further, in the case of an earthquake, as shown in FIG. 10, the vertical relationship between the column 91 and the beam 94 is broken, and the joint hardware 96 may be embedded in the beam. This is because a hole 98 for passing the bolt 97 is made in the joint metal. The hole is naturally slightly larger than the bolt, and the joint metal (cover plate) is in direct contact with the upper surface of the beam. This is considered to be the cause. In the case of this structure, when an earthquake occurs, the joint hardware tries to maintain the shape fixed to the column due to its rigidity, while the beam tries to maintain the horizontal, so the gap between the hole and the bolt Only the pillars are tilted, and the joint hardware sinks into the wood.

The present invention was created in consideration of the above circumstances, and its common purpose is to combine as many advantages as possible of the joint portion by the adhesive and the joint portion by the joint metal, and at least the design and workability and the attachment of the joint hardware. It is to keep the strength at a high level. The specific object of the inventions of claims 2 and 4 is to further improve the design. Furthermore, the specific object of the invention of claim 3 is to maintain the rigidity with respect to the rotational force of the beam with a high bell .

  The invention of claim 1 relates to a joint between a column and a beam that connects the column and the beam via a joint metal. The joining hardware includes a column fixing piece that is fixed to the side surface of the column at a position corresponding to the end face of the beam, and a beam fixing piece that is fixed to the upper surface of the beam in an L shape, and the column fixing piece and the beam fixing piece. Reinforcing pieces are formed across the two fixed pieces on the inner portion of the plate. The column is accommodated by fixing the most part of the horizontal bolt in the bolt insertion hole inside the column with an adhesive, and projecting one end of the horizontal bolt from the column to the beam side, and fixing the column to one end of the horizontal bolt. It is fixed with a nut through the hole. On the other hand, the beam is accommodated by fixing the most part of the vertical bolt with an adhesive in the bolt insertion hole in one end of the beam, and projecting one end of the vertical bolt upward from the upper surface of the beam, and extending the beam to one end of the vertical bolt. It is fixed with a nut through a hole in the fixed piece, and a slit leading to the column side is formed on the upper surface above the bottom surface. The reinforcing piece is accommodated in the slit to conceal the reinforcing piece from the bottom and side surfaces of the beam. It is. It is characterized by the above.

  The column fixing piece and one end of the horizontal bolt and the fastening nut thereof may have a structure that is not accommodated in the inside of the beam. However, in order to improve the design, the invention according to claim 2 is used. Is desirable. That is, the end surface of the beam is abutted against the column, and a concave groove communicating with the slit is formed from the upper surface to the upper side of the bottom surface within the lateral width of the one end portion of the beam. The fastening nut is accommodated in the groove.

  In the event of an earthquake, a rotational force is applied to the beam so that the column fixing piece and the beam fixing piece attempt to sink into the wood. In other words, the nut for preventing indentation of the column fixing piece / beam fixing piece into the column / beam is screwed into the horizontal bolt and the vertical bolt, respectively, and the indentation preventing nut is fixed to be flush with the side surface of the column and the upper surface of the beam. It is to be.

  The invention according to claim 4 is a method for joining a column and a beam, wherein most of the horizontal bolt is inserted into a bolt insertion hole inside the column to inject and harden the adhesive, and one end of the horizontal bolt is connected to the beam from the column. And a step of projecting to the side, inserting most of the vertical bolt into the bolt insertion hole in one end of the beam, injecting and curing the adhesive, and projecting one end of the vertical bolt upward from the beam upper surface, and a column on the upper surface The process of forming the slit leading to the side up to the upper side from the bottom is performed before the columns and beams are carried into the construction site. Then, a metal joint is prepared in which the column fixing piece and the beam fixing piece are continuous in an L shape, and a reinforcing piece is formed on the inner side of the column fixing piece and the beam fixing piece. After that, a step of fixing with a nut through a hole in the fixing piece of the fixing bracket to one end of the horizontal bolt protruding from the side surface of the column, and lifting the beam from below the fixed fixing fixture to reinforce the reinforcing piece in the slit of the beam And a step of passing one end of the vertical bolt through the hole of the beam fixing piece and a step of fixing the beam fixing piece to the vertical bolt with a nut at the construction site.

  Further, the column fixing piece and the one end of the horizontal bolt and the fastening nut thereof do not have to be accommodated in the beam, but it is desirable to improve the design as in the invention of claim 5. That is, the step of forming the concave groove communicating with the slit from the upper surface to the upper side of the bottom surface within the lateral width of one end of the beam is performed before the column and the beam are carried into the construction site, and the fixed joint metal A process of lifting the beam from below and inserting the reinforcing piece into the slit of the beam and accommodating the column fixing piece, one end of the horizontal bolt and its fastening nut in the groove is performed at the construction site.

In the event of an earthquake, a rotational force is applied to the beam, and the column fixing piece / beam fixing piece tries to sink into the wood. It is desirable to prevent this. In order to facilitate the injection of the adhesive, it is desirable to quickly position the horizontal bolt and the vertical bolt with respect to the bolt insertion hole and the bolt insertion hole .

  In the invention of claim 1, since the reinforcing piece is accommodated in the slit, the joint metal is not exposed on the bottom surface and side surface of the beam, so that the design is high. In addition, since the joint metal is fixed to the vertical bolt and the horizontal bolt fixed with an adhesive, the attachment strength of the joint metal is also high. In addition, since joints are used to assemble columns and beams by tightening nuts, the construction period can be shortened and the workability is also high.

  According to the second aspect of the present invention, since the column fixing pieces and the like are accommodated by the concave grooves, the joint hardware is accommodated in the beam except for the beam fixing pieces, and as a result, the design is further improved.

  Since the invention of claim 3 is screwed into the vertical bolts and horizontal bolts to make the indentation prevention nuts and flush with the columns and beams, the tightening force of the nuts to be stopped from above the column fixing pieces and beam fixing pieces is It is transmitted to the nut for preventing intrusion through the column fixing piece / beam fixing piece. Therefore, even if a rotational force is applied to the beam in the event of an earthquake, the column fixing piece and the beam fixing piece are not indented into the wood, and the rigidity against the rotational force of the beam can be maintained with a high bell.

  In the invention of claim 4, since the bonding process of the vertical bolt and the horizontal bolt is performed before the column and the beam are brought into the construction site, the construction period can be shortened without being bonded and cured at the construction site, and the temperature and humidity can be controlled. It is also possible to carry out at the factory where the mark was removed. And since only the assembly which consists of the fastening operation | work by a nut is performed at a construction site, the construction period in a site becomes short and construction property is high. Further, like the first aspect, the design and the mounting strength of the joint hardware are also high.

  According to the fifth aspect of the present invention, since the column fixing pieces and the like are accommodated by the concave grooves, the joint hardware is accommodated in the beam except for the beam fixing pieces, and as a result, the design is further improved. Moreover, since the insertion of the reinforcing piece into the slit and the insertion of the column fixing piece into the concave groove can be performed at once, the workability is also good.

  As shown in FIGS. 1 and 2, a joint metal 3 is used for the joint between the column 1 and the beam 2.

  The metal joint 3 protrudes sideways from the upper end of the column fixing piece 4 and continues in an L shape, and both the reinforcing pieces 6 are fixed to the center of the lateral width inside the column fixing piece 4 and the beam fixing piece 5. It is formed over the pieces 4 and 5. Bolt holes 7 and 8 are formed in the fixing pieces 4 and 5, respectively. The beam fixing piece 5 is narrower than the beam 2 and attached to the center of the width of the beam 2 so that the beam fixing piece 5 cannot be seen even when the beam 2 is viewed from a position slightly shifted from directly below. In this way, the design is enhanced.

  As shown in FIGS. 1 to 4, the pillar 1 is drilled through the bolt insertion hole 9 from the side surface toward the opposite surface. A plurality of bolt insertion holes 9 are provided at intervals in the vertical and horizontal directions in order to improve the mounting strength of the column fixing pieces 4 and are slightly larger than the horizontal bolts 10 to inject the adhesive 11 into the gaps. The bolt 10 is firmly fixed in a state in which both ends protrude horizontally from the pillar 1. Further, the column 1 is provided with an adhesive injection hole 12 and an air discharge hole 13 on the adjacent surface of the bolt insertion hole 9 so as to communicate with the bolt insertion hole 9 and to be spaced apart from each other on the left and right. When the nut 14 is fastened to the end of the horizontal bolt 10 protruding from the column 1 through the through hole 7 of the column fixing piece 4, the joint metal 3 protrudes laterally with respect to the column 1. The lateral bolts 10 are protruded from both sides of the column 1 in order to fix the beams 2 on both sides of the column 1 (not shown).

  The beam 2 is formed by opening a groove 15 in the center of the width of one end surface of the beam 2 only on the upper surface and the column surface. The column fixing piece 4 and the end of the horizontal bolt 10 and the fastening nut 14 are accommodated in the groove 15. To do. In addition, the beam 2 opens a slit 16 in the central portion of the lateral width of the concave groove 15 so as to open only on the column surface (end surface) and the upper surface, and accommodates the reinforcing piece 6 in the slit 16. Further, a bolt insertion hole 17 is formed on the upper surface of the beam 2 on both sides of the slit 16 without passing through the bottom surface. The bolt insertion hole 17 is slightly larger than the vertical bolt 19 in order to inject the adhesive 18, and the upper portion thereof is formed to be slightly larger as a seat 20, and a nut 21 for preventing the fitting is accommodated in the seat 20. The nut 21 is formed larger than the hole 8 of the beam fixing piece 5 and slightly larger than the seat 20, positioned in the seat 20 and accommodated without rattling, and is flush with the upper surface of the beam 2. The upper part of the bolt insertion hole 17 is closed. Further, an adhesive injection hole 23 and an air discharge hole 24 are provided on the side surface of the beam 2 so as to communicate with the bolt insertion hole 17 and are spaced apart from each other in the vertical direction. When the joint 3 is fixed to the column 1, the column 1 and the beam 2 are joined to the end of the vertical bolt 19 projecting from the upper surface of the beam 2 with the nut 25 through the hole 8 of the beam fixing piece 5. Integrate through.

  The construction procedure of the joint between the column and the beam described above is roughly divided into a preliminary process performed in advance at the factory before the column 1 and the beam 2 are carried into the construction site and an assembly process performed at the construction site.

  The preliminary process is performed in a factory where the temperature and humidity are controlled. As shown in FIG. 1, in addition to drilling the pillar 1, the horizontal bolt 10 is passed through the bolt insertion hole 9 to project both ends from the pillar 1, and the horizontal bolt in the bolt insertion hole 9 is formed. The horizontal bolt 10 is held horizontally with a gap around 10, the sealing agent S is injected into both inlet sides of the bolt insertion hole 9, and after the sealing agent S is cured, the adhesive 11 is added to the adhesive injection hole 12. It is filled so that the adhesive 11 comes out from the air discharge hole 13 and is cured as it is. For the beam 2, in addition to drilling and cutting (forming slits and grooves), a sealant S is applied to the interface between the bottom surface and the seating surface of the nut 21, and the nut 21 is attached at a predetermined position. The vertical bolt 19 is inserted into the bolt insertion hole 17 and the nut 21 is pushed into the seat 20 to be accommodated. The nut 21 is positioned in the seat 20 and the upper part of the bolt insertion hole 17 is sealed together with the sealant S. As a result, the axial lines of the vertical bolt 19 and the bolt insertion hole 17 are made to coincide with each other. The gaps are evenly spaced around the vertical bolts 19. Then, the sealant S is applied to the fitting portion of the vertical bolt 19 and the nut 21 from the outside, and after the sealant S is cured, the adhesive 18 is injected into the bolt insertion hole 17 in the same manner as the bolt insertion hole 9 and cured. Let

  In the assembly process, first, a nut 14 is fastened to one end portion of a horizontal bolt 10 protruding from the column 1 through a hole 7 of the column fixing piece 4 of the joint metal 3 to firmly fix the column fixing piece 4 to the column 1. Next, the beam 2 is lifted by a crane or the like, and the column fixing piece 4 of the metal fitting 3, the end of the horizontal bolt 10, the fastening nut 14, and the reinforcing piece 6 are inserted into the concave groove 15 and the slit 16 of the beam 2, The beam fixing piece 5 is applied to the upper surface of the beam 1 through the end of the vertical bolt 19 in the hole 8 of the beam fixing piece 5. Finally, a nut 25 is fastened to the vertical bolt 19 to support the beam 2 in a suspended state.

  FIG. 6 shows another example of the joint portion between the column 1 and the beam 2. In order to support the horizontal bolt 10 in the bolt insertion hole 9, a nut 26 for preventing indentation is used, the outer periphery of the nut 26 is made circular, and in addition to the vertical bolt 19, the lag screw 27 The lag screw 27 is screwed into the pilot hole 29 of the beam 2 from the hole 28 of the beam fixing piece 5 and is fixed. When the lag screw 27 is used, after the vertical bolt 19 is fastened with the nut 25 and the beam 2 is supported by being suspended from the pillar 1 via the joint metal 3, it is slightly larger in diameter than the prepared pilot hole 29. The lag screw 27 is screwed in. When the lag screw 27 is used, the weight of the beam 2 can be supported even when the bonding strength is reduced due to plasticization of the adhesive (which fixes the vertical and horizontal bolts) at a high temperature such as a fire. .

  Further, the diameter of the nut 26 for preventing indentation is the same as that of the seat 30 for easy sealing, and a plurality of small holes for catching are formed on the surface (not shown), and the tip of the hinge pin wrench is formed in the small hole. Insert and turn it by turning the hinge pin wrench. And when using this nut 26, the counterbore 30 is formed in the both ends of the bolt insertion hole 9, the horizontal bolt 10 with the nut 26 in one end is passed through the bolt insertion hole 9, and the horizontal bolt A nut 26 is screwed into the other end, and the nut 26 is positioned in the left and right seats 30 to be accommodated without a gap. In addition, the sealing agent S is applied in advance to the interface between the bottom surface of the nut 26 and the seat 30, the sealing agent is applied to the fitting portion of the nut accommodated in the seat, and finally an adhesive is injected. This is the same as the previous example.

  The joint part between the column and the beam described above has high designability because the joint hardware 3 is not exposed on the bottom and side surfaces of the beam 2. In addition, although the traces of the injection holes 12 and 23 of the adhesives 11 and 18 and the air discharge holes 13 and 24 remain on the side surfaces of the pillar 1 and the beam 2, the design properties are hardly affected because they are very small. Although not shown in order to improve the appearance, it is desirable that the pillar 1 and the beam 2 have wooden plugs in the adhesive injection hole and the air discharge hole.

  The following tests were performed on the above-described joint between the column and the beam. A pine pine laminated lumber (E120-F330) having a cross section of 170 × 300 mm and a beam of 170 × 420 mm was used for the column. As the joining hardware, ordinary steel SS400 having a thickness of 19 mm, column fixing pieces 120 × 415 mm, and beam fixing pieces 120 × 376 mm were used. S45C full screw bolts were used for the vertical and horizontal bolts. Then, as shown in FIG. 7, the column and the two beams are assembled in an inverted T shape, the end of the beam is fixed, the steel rod penetrates the point A at the top of the column, and the steel rod protruding from the column is horizontal. A load was applied. The relationship between the moment and the column deformation angle, which is the test result, is shown in the graph of FIG. From this test result, the joint portion of this example is elastic and has high rigidity, and its maximum moment is as high as 126 kN · m.

It is an exploded view which shows the joining method of a column and a beam. It is an assembly drawing which shows the junction part of a column and a beam. (A) and (b) are drawings showing the processing states of columns and beams. (A) and (b) are exploded views showing preliminary steps in the factory. (A) and (B) are a longitudinal sectional view and a cross sectional view taken along line AA, showing a joint between a column and a beam. It is the longitudinal cross-sectional view which shows another example of the junction part of a pillar and a beam, and the AA line cross-sectional view. It is explanatory drawing which shows a test method. It is a graph which shows a test result. It is principal part sectional drawing which shows the junction part of the conventional column and a beam. It is explanatory drawing which shows the sinking state of the joining metal object to a timber.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Column 2 Beam 3 Joint metal 4 Column fixed piece 5 Beam fixed piece 6 Reinforcement piece 7 Punching hole 8 Punching hole 9 Bolt insertion hole 10 Horizontal bolt 11 Adhesive 14 Nut 15 Groove 16 Slit 17 Bolt insertion hole 18 Adhesive 19 Vertical bolt 20 Sitting 21 Nut 25 Nut 26 Nut 30 Sitting

Claims (5)

At the junction between the column and the beam connecting the column (1) and the beam (2) via the joint hardware (3),
The metal joint (3) has a column fixing piece (4) fixed to the side surface of the column at a position corresponding to the end face of the beam and a beam fixing piece (5) fixed to the upper surface of the beam in an L shape, Reinforcing pieces (6) are formed over both the fixing pieces on the inner side of the column fixing pieces (4) and beam fixing pieces (5),
The column (1) accommodates the most part of the horizontal bolt (10) with the adhesive (11) in the bolt insertion hole (9) in the interior thereof, and also accommodates one end of the horizontal bolt (10) from the column. It protrudes to the beam side, and is fixed with a nut (14) through a through hole (7) of a column fixing piece (4) at one end of the horizontal bolt (10),
On the other hand, the beam (2) accommodates most part of the vertical bolt (19) with the adhesive (18) in the bolt insertion hole (17) in one end thereof, and also accommodates one end of the vertical bolt (19). Projected upward from the upper surface of the beam, fixed to the one end of the vertical bolt with a nut (25) through a hole (8) in the beam fixing piece (5), and a slit (16) leading to the column side on the upper surface A column-to-beam joint characterized in that the reinforcing piece (6) is accommodated in the slit (16) and the reinforcing piece (6) is concealed from the bottom and side surfaces of the beam.   The end face of the beam is abutted against the column, and a concave groove (15) communicating with the slit (16) is formed from the upper surface to the upper side of the bottom surface within the lateral width of one end of the beam, and the column fixing piece (4) 2. The column-to-beam joint according to claim 1, wherein one end of the lateral bolt and the fastening nut are accommodated in the concave groove.   Screw the column fixing pieces (4) and beam fixing pieces (5) into the columns and beams, and screw them into the horizontal bolts (10) and vertical bolts (19), respectively. 3. A column / beam joint according to claim 1 or 2, wherein a nut for preventing indentation (26, 21) is fixed on the upper surface of said frame. The most part of the horizontal bolt (10) is inserted into the bolt insertion hole (9) inside the column to inject and cure the adhesive (11), and one end of the horizontal bolt (10) protrudes from the column to the beam side. Step of inserting the most part of the vertical bolt (19) into the bolt insertion hole (17) in one end of the beam, injecting and curing the adhesive (18), and raising one end of the vertical bolt (19) from the upper surface of the beam The process of forming the slit (16) leading to the column side on the upper surface to the upper side from the bottom surface is performed before carrying the column and beam to the construction site,
The column fixing piece (4) and the beam fixing piece (5) are continuous in an L-shape, and a reinforcing piece (6) is provided on both inner sides of the column fixing piece (4) and the beam fixing piece (5). After preparing the formed joint hardware (3),
A step of fixing with a nut (14) through a hole (7) of a column fixing piece (4) of a metal fitting (3) to one end of a horizontal bolt (10) protruding from a side surface of the column, and a fixed metal fitting (3 The beam is lifted from below, the reinforcing piece (6) is inserted into the slit (16) of the beam, and one end of the vertical bolt (19) is passed through the hole (8) of the beam fixing piece, and the beam fixing A method for joining columns and beams, characterized in that the step of fixing the piece (5) to the vertical bolt (19) with a nut (25) is performed at the construction site. The step of forming the concave groove (15) communicating with the slit (16) from the upper surface to the upper side of the bottom surface within the lateral width of one end of the beam is performed before the column and the beam are carried into the construction site,
The beam is lifted from below the fixed metal fitting (3), the reinforcing piece (6) is inserted into the slit (16) of the beam, and one end of the column fixing piece (4) and the lateral bolt (10) and its fastening. 5. The method for joining columns and beams according to claim 4, wherein the step of housing the nut (14) in the groove (15) is performed at the construction site.

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