Column-beam joint structure and its construction method

Abstract

To provide a column-beam joint structure that has high joint strength and high joint rigidity between the joint part of the column and the wooden beam and excels in workability, and its construction method, for a column-beam joint structure made by joining a concrete column and a wooden beam.SOLUTION: A column-beam joint structure 100 comprises a concrete column 10 joined with a wooden beam 50. In the column 10, at least the joint part 10A to which the wooden beam 50 is joined is precast concrete. The joint part 10A has an insert nut 20 with female threads 22 buried in it, the female thread 22 opening at the side face 11 of the joint part 10A. The wooden beam 50 has a box-shaped notch 55 and an insertion hole 56 that runs through the notch 55 and extends up to a contact end face 53 of the wooden beam 50 to butt with the joint part 10A. One end 61 of a bolt 60 inserted in the insertion hole 56 is screwed in the female thread 22. The other end 62 of the bolt 60 is tightened with a nut 66 inside the notch 55 to press the side face 55a of the notch 55.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a column-beam joint structure and a construction method thereof. [Background technology]

[0002] Building structures often involve extending RC or S brackets from the sides of reinforced concrete (RC), steel (SRC), steel-reinforced concrete (SRC), or even wooden columns. Wooden beams are then bolted to the brackets, and a RC, wooden, or steel deck is then placed on top of the wooden beams. For example, RC columns can be constructed on-site, or they can be precast concrete (PCa) columns, which are prefabricated in a factory, transported to the site, and assembled on-site. The use of PCa columns significantly shortens construction time and produces high-quality beam-to-column joints. There are also various types of column-bracket configurations, including RC structures where the columns and brackets are integrated, and structures with bracket-equipped joints between the upper and lower columns. However, since a bracket of a certain length protrudes from the joint, there are issues with transporting PCa columns with PCa joints from the factory to the site, and there is also a risk of interference with other assembly components when hoisting them on site using a crane or other device.

[0003] Therefore, by using wooden beams, it is possible to reduce the burden on the environment, and because they are lightweight, the beams are easy to handle and install on site, and the excellent appearance and design that wood brings about is achieved.However, the presence of brackets protruding from the joints reduces transportability and installability, so a column-beam joint structure without brackets is desired.

[0004] Here, Patent Document 1 proposes a joint structure for wooden beams. In this joint structure, a wooden beam is joined to a wooden column, and a concrete joint is placed at the joint between the column and the beam, and the column and the beam are joined via the joint. One end of a lag screw bolt, which serves as a fastener for the core material, is screwed into the end of the beam, and the other end of the lag screw bolt is embedded and fixed in the concrete that forms the joint. Because the other end of the lag screw bolt is embedded in the concrete joint, the joint is constructed by pouring concrete on-site. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2020-101020 Summary of the Invention [Problem to be solved by the invention]

[0006] As mentioned above, the beam-column joint structure described in Patent Document 1 eliminates the need for brackets that extend outward from the sides of the joint. However, when constructing the concrete joint, it is necessary to pour the concrete on-site, which poses issues with workability, including assembling and removing the formwork. There are also issues such as the need for a curing period after pouring the concrete, which lengthens the construction period.

[0007] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a column-beam joint structure in which a concrete column and a wooden beam are joined, which eliminates the need for a bracket protruding from the column joint, while providing a column-beam joint structure with high joint strength and joint rigidity between the joint and the wooden beam, and excellent workability, and a construction method therefor. [Means for solving the problem]

[0008] In order to achieve the above object, one aspect of the column-beam joint structure according to the present invention is as follows: A column-beam joint structure in which concrete columns and wooden beams are joined, At least the joints of the columns that are joined to the wooden beams are made of precast concrete, An insert nut with a female thread is embedded in the joint, and the female thread faces the side surface of the joint, The wooden beam is provided with a box-shaped notch and an insertion hole that communicates with the notch and extends to the abutting end face of the wooden beam with the joint, One end of a bolt passed through the insertion hole is threaded into the female thread, and the other end of the bolt is fastened with a nut inside the notch so as to press against the side of the notch.

[0009] According to this embodiment, the column joint (or panel zone) is made of precast concrete, and one end of a bolt passed through a through hole that communicates with a box-shaped notch in the wooden beam and extends to the abutting end face is threaded into the female thread of an insert nut embedded in the joint, and the other end of the bolt is tightened with a nut, a so-called tension bolt structure is applied.This eliminates the need for a bracket that protrudes from the column joint, and results in a column-beam joint structure that has high joint strength and joint rigidity between the joint and the wooden beam, making it easy to install.

[0010] Here, "at least the joint connecting the wooden beams is made of precast concrete" includes cases where the joint and the general section of one of the columns above and below it are made of precast concrete manufactured in a factory or the like, and the general section of the remaining column is made of on-site concrete; cases where the joint and the general sections of the columns above and below it are entirely made of precast concrete; and cases where only the joint is made of precast concrete, and the general sections of the columns above and below the joint are made of on-site concrete. "Precast" also includes "half precast," which includes joints constructed by pouring concrete on-site inside the outer shell of a precast structure. Using half precast construction improves workability compared to pouring the entire joint on-site.

[0011] In another aspect of the column-beam joint structure according to the present invention, A plurality of the insert nuts are embedded in the joint, The wooden beam has a plurality of notches and insertion holes at positions corresponding to a plurality of the insert nuts, and the joint and the wooden beam are joined by a plurality of the bolts.

[0012] According to this aspect, the tips of the bolts inserted into the insertion holes in the wooden beam are threaded onto the insert nuts embedded in the joint, and each bolt is tightened inside the corresponding notch, resulting in a column-beam joint structure with even higher joint strength and joint rigidity. For example, there may be a configuration in which two notches are provided facing the top and bottom surfaces of the wooden beam, or a configuration in which one or more notches are provided facing the side surface sandwiched between them.

[0013] Another aspect of the column-beam joint structure according to the present invention is as follows: A convex portion protrudes from the side surface of the joint, and a concave portion that engages with the convex portion is provided on the abutting end surface of the wooden beam, The insert nut is embedded in the protrusion, In the wooden beam, the insertion hole faces the recess, and the notch is provided so as to communicate with the insertion hole, With the recess and the protrusion engaged, one end of a bolt passed through the insertion hole is threaded into the female thread, and the bolt is tightened with a nut.

[0014] According to this aspect, with the convex portion provided in the joint engaged with the concave portion provided on the abutting end surface of the wooden beam, one end of the bolt inserted into the insertion hole communicating with the concave portion of the wooden beam is threaded into the insert nut embedded in the convex portion, and the other end of the bolt is nut-tightened inside the corresponding notch, so that the shear force caused by the load acting on the wooden beam can be transmitted more reliably to the joint and the column.

[0015] Another aspect of the column-beam joint structure according to the present invention is as follows: A fixing plate is attached to the insert nut, The fixing plate is characterized in that the insert nut is fixed to the joint.

[0016] According to this aspect, the insert nut is fixed to the joint by the fixing plate attached to the insert nut, so that the insert nut can be securely fixed to the joint even when a relatively short insert nut is used, for example.

[0017] Another aspect of the column-beam joint structure according to the present invention is as follows: A fixing bar is attached to the insert nut, The fixing reinforcement is characterized in that the insert nut is fixed to the joint.

[0018] According to this aspect, the insert nut is secured to the joint by the anchoring bars attached to the insert nut, and the length and shape of the anchoring bars can be varied to ensure reliable anchoring of the insert nut to the joint with anchoring bars of an appropriate length and shape. For example, linear anchoring bars can be used, or if a straight line does not provide sufficient anchoring, L-shaped linear anchoring bars can be used.

[0019] Another aspect of the column-beam joint structure according to the present invention is as follows: A fixing groove is attached to the insert nut, and a fixing plate is attached to an end of the fixing groove, The insert nut is fixed to the joint by the fixing bars and the fixing plate.

[0020] According to this aspect, the insert nut is fixed to the joint by the fixing bars attached to the insert nut and the fixing plates attached to the ends of the fixing bars, thereby ensuring secure fixation of the insert nut to the joint while shortening the length of the fixing bars compared to when only the fixing bars are used.

[0021] Another aspect of the column-beam joint structure according to the present invention is as follows: A plurality of insert nuts are embedded in corresponding positions on a pair of opposing side surfaces of the column with the female threads facing each other, and a pair of wooden beams are joined to each insert nut via the bolt, A pair of corresponding insert nuts are joined to each other by anchoring bars that pass through the joint.

[0022] According to this aspect, a pair of insert nuts embedded in corresponding positions on a pair of opposing side surfaces of a column are joined to a pair of wooden beams via bolts, and the pair of insert nuts are joined to each other by anchoring bars that penetrate the joint, so that the pair of insert nuts can be effectively fixed to each other with linear anchoring bars. In other words, even if the anchoring bars are not long enough, the other insert nut can function as an anchoring plate, so both insert nuts can be securely fixed to the joint.

[0023] Another aspect of the column-beam joint structure according to the present invention is as follows: The wooden beam is characterized in that it is a laminated wooden beam consisting of a pair of the wooden beams.

[0024] According to this embodiment, by joining a pair of wooden beams to the joint, the support performance of the deck, etc. is improved, and the rigidity of the ends of the wooden beams is increased, resulting in a column-beam joint structure with even higher joint strength and joint rigidity.

[0025] In addition, one aspect of the construction method for a column-beam joint structure according to the present invention is as follows: A construction method for a column-beam joint structure in which a concrete column and a wooden beam are joined to construct a column-beam joint structure, At least the joints of the columns that are joined to the wooden beams are made of precast concrete, An insert nut with a female thread is embedded in the joint, and the female thread faces the side surface of the joint, The wooden beam is provided with a box-shaped notch and an insertion hole that communicates with the notch and extends to the abutting end face of the wooden beam with the joint, The column-beam joint structure is constructed by threading one end of a bolt passed through the insertion hole into the female thread, and tightening the other end of the bolt with a nut inside the notch so as to press against the side of the notch.

[0026] According to this embodiment, the column joint is made of precast concrete, and one end of a bolt passed through a through hole that communicates with a box-shaped notch in the wooden beam and extends to the abutting end face is screwed into the female thread of the insert nut embedded in the joint, and the other end of the bolt is tightened with a nut, thereby enabling the construction of a column-beam joint structure with high joint strength and joint rigidity between the column joint and the wooden beam with excellent workability. [Effects of the Invention]

[0027] As can be understood from the above explanation, the column-beam joint structure and construction method of the present invention can provide a column-beam joint structure in which a concrete column and a wooden beam are joined, which eliminates the need for brackets protruding from the column joints, while providing high joint strength and joint rigidity between the joints and the wooden beams and excellent workability, as well as a construction method therefor. [Brief explanation of the drawings]

[0028] [Figure 1] 3 is a perspective view of an example of a column-beam joint structure according to an embodiment, and is a process diagram of an example of a construction method for the column-beam joint structure according to an embodiment, following FIG. 2. FIG. [Figure 2] FIG. 2 is a process diagram of an example of a construction method for a beam-column joint structure according to an embodiment. [Figure 3] 3 is a view taken along the line III-III in FIG. 1, and is a longitudinal cross-sectional view of an example of a beam-column joint structure according to an embodiment. [Figure 4] FIG. 4 is a view corresponding to FIG. 3 and is a vertical cross-sectional view of another example of the beam-column joint structure according to the embodiment. [Figure 5] FIG. 4 is a view corresponding to FIG. 3 and is a vertical cross-sectional view of still another example of the beam-column joint structure according to the embodiment. [Figure 6] FIG. 4 is a view corresponding to FIG. 3 and is a vertical cross-sectional view of still another example of the beam-column joint structure according to the embodiment. [Figure 7] FIG. 2 is a view corresponding to FIG. 1 and is a perspective view of still another example of a beam-column joint structure according to the embodiment. [Figure 8] 8 is a view taken along the arrows VIII-VIII in FIG. 7, and is a vertical cross-sectional view of still another example of the beam-column joint structure according to the embodiment. [Figure 9A] 9 is a cross-sectional view taken along the line IX-IX in FIG. 8, showing still another example of the beam-column joint structure according to the embodiment. [Figure 9B] FIG. 9B is a cross-sectional view corresponding to FIG. 9A and showing still another example of the beam-column joint structure according to the embodiment. [Figure 10] This figure corresponds to Figure 1 and is an oblique view of yet another example of a column-beam joint structure according to an embodiment, and is a process diagram of yet another example of a construction method for a column-beam joint structure according to an embodiment, following Figure 11. [Figure 11] FIG. 10 is a process diagram of yet another example of a construction method for a beam-column joint structure according to an embodiment. [Figure 12] FIG. 2 is a view corresponding to FIG. 1 and is a perspective view of still another example of a beam-column joint structure according to the embodiment. [Figure 13] 13 is a cross-sectional view taken along the arrows XIII-XIII in FIG. 12, showing still another example of the beam-column joint structure according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0029] Hereinafter, several examples of beam-column joint structures and construction methods thereof according to embodiments will be described with reference to the accompanying drawings. Note that in this specification and drawings, substantially identical components may be designated by the same reference numerals to avoid redundant description.

[0030] [Column-beam joint structure according to the embodiment and its construction method] 1 to 13, several examples of a column-beam joint structure and a construction method thereof according to an embodiment will be described. Here, Fig. 1 is a perspective view of an example of a column-beam joint structure according to an embodiment, and Fig. 2 is a process diagram of an example of a construction method of a column-beam joint structure according to an embodiment, following Fig. 2. Fig. 2 is a process diagram of an example of a construction method of a column-beam joint structure according to an embodiment. Fig. 3 is a view taken along the arrows III-III in Fig. 1, and is a longitudinal cross-sectional view of an example of a column-beam joint structure according to an embodiment.

[0031] The column-beam joint structure 100 shown in FIG. 1 is formed by joining the side surface 11 of a joint 10A constituting the column 10 and the abutting end surface 53 of a wooden beam 50 together.

[0032] The column 10 is composed of a joint 10A and an upper column 10B and a lower column 10C above and below it, which are an integral structure made of reinforced concrete, and may be a PCa column manufactured in a factory and transported to the site, or a PCa column manufactured on-site (so-called on-site PCa).The PCa column 10 may also be a column made of steel-reinforced concrete, a column made of concrete-filled steel tube (CFT), or the like.

[0033] Here, the column 10 only needs to have at least the joint 10A that is directly joined to the wooden beam 50 made of precast concrete, and for example, the upper column 10B and the lower column 10C may be columns constructed with cast-in-place concrete. Note that in all of the various modified column-beam joint structures described below, the entire column 10 will be described as a PCa column.

[0034] As shown in Figure 3, an insert nut 20 with a female thread 22 is embedded in the joint 10A, and the female thread 22 faces the side surface 11 of the joint 10A. As will be explained below, this insert nut 20 with the female thread 22 is a member that screws onto one end 61 of a bolt 60 that protrudes from the wooden beam 50 to connect the two, thereby eliminating the need for a bracket to be joined to the beam.

[0035] On the other hand, as shown in Figures 1 to 3, the wooden beam 50 has box-shaped notches 55 on its upper surface 51 and lower surface 52, and each notch 55 has an insertion hole 56 extending to the abutting end surface 53 with the side surface 11 of the joint 10A.

[0036] The wooden beam 50 is formed by laminating a large number of sawn boards with their fiber directions alternately crossing at right angles and then bonding them together. Here, the wooden beam 50 may be made of not only a laminate of sawn boards, but also cross-laminated timber (CLT) or laminated veneer lumber (LVL), etc.

[0037] As shown in Figures 2 and 3, one end 61 of a bolt 60 passed through the insertion hole 56 is threaded into the female thread 22, and the other end 62 of the bolt 60 is tightened by a nut 66 via a washer 65 so as to press against the side surface 55a of the notch 55 inside the notch 55.

[0038] In the illustrated example of the beam-column joint structure 100, one end 61 of two bolts 60 inserted into insertion holes 56 communicating with two notches 55 at the top and bottom of the wooden beam 50 is threaded into the female threads 22 of the insert nuts 20 embedded in the joint 10A, thereby joining the joint 10A and the wooden beam 50 using a tension bolt structure.

[0039] As shown in Figure 3, inside the joint 10A, one end of the anchoring bar 30 is fixed by screwing or welding to the female thread 22 of the insert nut 20, and an anchoring plate 40 is attached to the other end. That is, the insert nut 20, which threads onto one end 61 of the bolt 60 of the wooden beam 50, is fixed to the joint 10A by the anchoring bar 30 of a predetermined length and the anchoring plate 40. Note that even if the anchoring bar 30 alone does not have a sufficient anchoring length, the presence of the anchoring plate 40 allows the insert nut 20 to be sufficiently fixed to the joint 10A.

[0040] The bolt 60 to be applied here may have threads at one end 61 and the other end 62 that screw into the female thread 22 and the nut 66, and no threads in the general portion between them. In this form, by setting the diameter of the general portion without threads smaller than the diameters of the one end 61 and the other end 62 that have threads (making the strength of the general portion relatively small), when the frame deforms during an earthquake and a tensile force acts on the bolt 60, the entire general portion of the bolt 60 will yield first, which is preferable because it allows seismic energy to be absorbed effectively.

[0041] The method of constructing the beam-column joint structure at the site is to transport and erect the column 10 including the joint 10A made of precast concrete on the site.

[0042] Next, one end 61 of the bolt 60 passed through the insertion hole 56 of the wooden beam 50 is screwed into the female thread 22 of the insert nut 20 facing the side surface 11 of the joint 10A, and the other end 62 of the bolt 60 is tightened with a nut 66 so as to press against the side surface 55a of the notch 55 inside the notch 55, thereby constructing the column-beam joint structure 100.

[0043] The column-beam joint structure 100 shown in Figure 1 is a structure in which the abutting end surface 53 of a wooden beam 50 is joined to one column 10, but in a building frame, a pair of columns 10 are erected with a predetermined span between them, and the abutting end surfaces 53 at both ends of a wooden beam 50 suspended by, for example, a crane are abutted against each joint 10A of both columns 10, and one end 61 of a bolt 60 is screwed into the female thread 22 of each insert nut 20, and the other end 62 is tightened with a nut 66 inside the notch 55, thereby forming two column-beam joint structures 100 simultaneously or sequentially.

[0044] According to the construction method shown in the figure, at least the joint 10A of the column 10 is made of precast concrete, and one end 61 of a bolt 60 is threaded into the female thread 22 of an insert nut 20 embedded in the joint 10A. The bolt 60 is passed through a through hole 56 that communicates with a box-shaped notch 55 in the wooden beam 50 and extends to the abutting end face 53. The other end 62 of the bolt 60 is tightened with a nut 66. This eliminates the need for a bracket that protrudes laterally from the joint, and allows for the construction of a column-beam connection structure 100 that has high connection strength and rigidity between the joint 10A of the column 10 and the wooden beam 50 with excellent workability.

[0045] A floor slab (not shown) is placed on the upper surface 51 of the wooden beam 50 that forms the beam-column joint structure 100. This floor slab can take various forms, such as PCa floor slabs (PCa reinforced concrete floor slabs, PCa prestressed concrete floor slabs (PC floor slabs)), PC composite floor slabs that are half PCa floor slabs and on-site constructed floor slabs, and ALC (Autoclaved Lightweight Aerated Concrete) panels.

[0046] Next, another example of the beam-column joint structure according to the embodiment will be described with reference to FIGS. Here, Figs. 4, 5, and 6 are all figures corresponding to Fig. 3 and are longitudinal cross-sectional views of another example of a column-beam joint structure according to the embodiment. Fig. 7 is a figure corresponding to Fig. 1 and is a perspective view of yet another example of a column-beam joint structure according to the embodiment. Fig. 8 is a view taken along arrows VIII-VIII in Fig. 7 and is a longitudinal cross-sectional view of yet another example of a column-beam joint structure according to the embodiment. Fig. 9A is a view taken along arrows IX-IX in Fig. 8 and is a cross-sectional view of yet another example of a column-beam joint structure according to the embodiment. Fig. 9B is a figure corresponding to Fig. 9A and is a cross-sectional view of yet another example of a column-beam joint structure according to the embodiment. Fig. 10 is a figure corresponding to Fig. 1 and is a perspective view of yet another example of a column-beam joint structure according to the embodiment, and, following Fig. 11, is a process diagram of yet another example of a construction method for a column-beam joint structure according to the embodiment. Fig. 11 is a process diagram of yet another example of a construction method for a column-beam joint structure according to the embodiment. Furthermore, Figure 12 is a figure corresponding to Figure 1 and is an oblique view of yet another example of a column-beam joint structure according to an embodiment, and Figure 13 is a view taken along the arrows XIII-XIII in Figure 12 and is a cross-sectional view of yet another example of a column-beam joint structure according to an embodiment.

[0047] The column-beam joint structure 100A shown in Figure 4 has multiple insert nuts 20 (two, one on top and one on bottom, in the illustrated example) embedded in corresponding positions on a pair of opposing side surfaces 11 of the joint 10A of the column 10, with the female threads 22 facing out, and a pair of wooden beams 50 joined to each insert nut 20 via bolts 60.

[0048] In the beam-column joint structure 100A, both ends of the anchoring bars 30 that pass through the joint 10A are fixed to a corresponding pair of insert nuts 20 by screwing or welding, thereby joining the two nuts together.

[0049] The column-beam joint structure 100B shown in Figure 5 has a configuration similar to that of the column-beam joint structure 100A shown in Figure 4 in principle, but differs from the column-beam joint structure 100A in that the anchor plate 40 is directly fixed to the insert nut 20, or the anchor plate 40 and the insert nut 20 are an integral structure (integrally molded product).

[0050] The beam-column joint structure 100C shown in Fig. 6 has one end of an L-shaped anchor bar 30A fixed to each insert nut 20 by screwing or welding, and an anchor plate 40 attached to the other end of the anchor bar 30A. Here, since the L-shaped anchor bar 30A ensures a sufficient anchor length compared to straight anchor bars, the anchor plate 40 may be omitted.

[0051] In the beam-column joint structure 100D shown in Figures 7, 8, and 9A, the wooden beam 50A has notches 55 on the top surface 51 and bottom surface 52, as well as two additional rows of notches 55 on the side surface 54, for a total of four notches 55 and insertion holes 56 corresponding to each notch 55. Four insert nuts 20 are embedded in positions corresponding to the four bolts 60 on each side surface 11 of the joint 10A, with the female threads 22 facing out. Here, as shown in Figure 9A, the width of the wooden beam 50A (the width between the left and right side surfaces 54) is t1.

[0052] According to the beam-column joint structure 100D, the number of bolts 60 connecting the joint 10A and the wooden beam 50A is further increased, resulting in a joint structure with even higher joint strength and joint rigidity.

[0053] In contrast, in the beam-column joint structure 100E shown in Fig. 9B, the width t2 of the wooden beam 50B is, for example, twice the width t1 of the wooden beam 50A, and the wooden beam 50B has four rows of notches 55 in the height direction as shown in Fig. 7 and two notches 55 in the width direction as shown in Fig. 9B, for a total of eight notches 55 and insertion holes 56 corresponding to each of the notches 55. Eight insert nuts 20 are embedded in the positions corresponding to the eight bolts 60 on each side 11 of the joint 10A, with the female threads 22 facing out.

[0054] According to the beam-column joint structure 100E, the number of bolts 60 connecting the joint 10A and the wooden beam 50A is further increased, resulting in a joint structure with even higher joint strength and joint rigidity.

[0055] In the beam-column joint structure 100F shown in Figure 10, a convex portion 18 protrudes from the side surface 11 of the joint 10A, a concave portion 58 that engages with the convex portion 18 is provided on the abutting end surface 53 of the wooden beam 50C, an insert nut (not shown) is embedded in the convex portion 18, and in the wooden beam 50C, an insertion hole (not shown) faces the recess 58, and a notch (not shown) is provided so that the insertion hole is connected to the recess 58.When the recess 58 and the convex portion 18 are engaged, one end 61 of a bolt 60 passed through the insertion hole is threaded into the female thread 22, and the bolt is tightened with a nut.

[0056] As with other forms, the upper surface 51 of the wooden beam 50C has a notch 55 facing the upper surface 51, and a through hole communicating with the notch 55 extends to the abutting end surface 53, and a bolt 60 is inserted into the through hole, one end 61 of which is threaded into the female thread 22 of the insert nut.

[0057] In the column-beam joint structure 100F, the recess 58 provided on the abutting end face 53 of the wooden beam 50C engages with the protrusion 18 provided on the joint 10A, and one end of the bolt 60 inserted into the insertion hole communicating with the recess 58 of the wooden beam 50C is screwed into the insert nut embedded in the protrusion 18, and the other end of the bolt 60 is nut-tightened inside the corresponding notch, so that the shear force caused by the load acting on the wooden beam 50C can be transmitted more reliably to the joint 10A and the column 10.

[0058] The beam-column joint structure 100G shown in Figures 12 and 13 has a configuration in which a pair of wooden beams 50A are arranged side by side with a gap 59 between them to form a laminated wooden beam 70 joined to the side surface 11 of the joint 10A.

[0059] As already explained, the pair of wooden beams 50A that form the laminated wooden beam 70 are joined by the insert nuts 20 and bolts 60 embedded in the joints 10A.

[0060] Since the wooden beams are laminated wooden beams 70, the deck slab can be supported more stably, and since two wooden beams 50A are joined to the side 11 of the joint 10A, the joint structure has even higher joint strength and joint rigidity.

[0061] The present invention is not limited to the configurations shown here, and other embodiments may be possible in which other components are combined with the configurations described in the above embodiments. In this regard, the present invention can be modified within the scope of the present invention, and can be appropriately determined depending on the application form. [Explanation of symbols]

[0062] 10: Pillar (PCa pillar) 10A: Joint 10B: Upper pillar 10C: Lower pillar 11: Side 15: Main reinforcement 17: Stirrup 18: Convex 20: Insert nut 22: Female thread 30, 30A: Fixing bars 40: Fixing plate 50,50A,50B,50C: Wooden beam 51:Top surface 52: Bottom surface 53: Contact end surface 54: Side 55: Cutout (box-shaped cutout) 55a: Side 56:Through hole 58: Recess 59: Gap 60: Bolt 61: One end 62: Other end 65: Washer 66: Nut 70: Laminated wooden beam 100, 100A, 100B, 100C, 100D, 100E, 100F, 100G: Column-beam joint structure

Claims

1. A column-beam joint structure in which concrete columns and wooden beams are joined, At least the joints of the columns that are joined to the wooden beams are made of precast concrete, An insert nut with a female thread is embedded in the joint, and the female thread faces the side surface of the joint, The wooden beam is provided with a box-shaped notch and an insertion hole that communicates with the notch and extends to the abutting end face of the wooden beam with the joint, A column-beam joint structure characterized in that one end of a bolt passed through the insertion hole is threaded into the female thread, and the other end of the bolt is tightened with a nut inside the notch so as to press against the side of the notch.

2. A plurality of the insert nuts are embedded in the joint, 2. The column-beam joint structure according to claim 1, wherein a plurality of the notches and insertion holes are provided in the wooden beam at positions corresponding to a plurality of the insert nuts, and the joint and the wooden beam are joined by a plurality of the bolts.

3. A convex portion protrudes from the side surface of the joint, and a concave portion that engages with the convex portion is provided on the abutting end surface of the wooden beam, The insert nut is embedded in the protrusion, In the wooden beam, the insertion hole faces the recess, and the notch is provided so as to communicate with the insertion hole, 2. A column-beam joint structure as described in claim 1, characterized in that, with the recess and the protrusion engaged, one end of a bolt passed through the insertion hole is threaded into the female thread and the bolt is tightened with a nut.

4. A fixing plate is attached to the insert nut, The column-beam joint structure according to any one of claims 1 to 3, characterized in that the insert nut is fixed to the joint by the fixing plate.

5. A fixing bar is attached to the insert nut, The beam-column joint structure according to any one of claims 1 to 3, characterized in that the insert nut is fixed to the joint by the fixing reinforcement.

6. A fixing groove is attached to the insert nut, and a fixing plate is attached to an end of the fixing groove, The column-beam joint structure according to any one of claims 1 to 3, characterized in that the insert nut is fixed to the joint by the fixing bars and the fixing plates.

7. A plurality of insert nuts are embedded in corresponding positions on a pair of opposing side surfaces of the column with the female threads facing each other, and a pair of wooden beams are joined to each insert nut via the bolt, 4. The beam-column joint structure according to claim 1, wherein a corresponding pair of the insert nuts are joined to each other by anchoring bars that pass through the joint.

8. 4. The beam-column joint structure according to claim 1, wherein the wooden beam is a laminated wooden beam consisting of a pair of the wooden beams.

9. A construction method for a column-beam joint structure in which a concrete column and a wooden beam are joined to construct a column-beam joint structure, At least the joints of the columns that are joined to the wooden beams are made of precast concrete, An insert nut with a female thread is embedded in the joint, and the female thread faces the side surface of the joint, The wooden beam is provided with a box-shaped notch and an insertion hole that communicates with the notch and extends to the abutting end face of the wooden beam with the joint, a bolt passing through the insertion hole and threading the bolt into the female thread, and a nut tightening the other end of the bolt so as to press against the side of the notch inside the notch, thereby constructing the column-beam connection structure.

Images