Column-beam joint structure

Abstract

To provide a joint structure for columns and beams suppressing the misalignment of split column-beam joint parts of a pair of precast beams upon an earthquake.SOLUTION: A joint structure 100 for columns and beams is provided with: a lower precast column 10; a pair of precast beams 30 each of which has a split column-beam joint part 34 which is made by separating a column-beam joint part 16 of the lower precast column 10 in a right and left direction, and placed on the lower precast column 10 in a state in which corresponding column-beam joint surfaces 34T of the split column-beam joint parts 34 face each other, respectively; and a steal plate 120 jointed over a right and left split column-beam joint part 34 in the right and left direction and in which a plurality of bore holes 122 are formed.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] Patent Document 1 discloses a technology relating to a precast column-beam member joint structure. In this prior art, the precast column-beam member joint structure includes a lower precast column member and a pair of precast beam members having split column-beam joint parts at their ends, which are formed by dividing the column-beam joint part of the lower precast column member into left and right parts, and each split column-beam joint part is placed on the lower precast column member.

[0003] Patent Document 2 discloses a method for constructing a joint structure and a technique related to the joint structure. In this prior art, a perforated steel dowel is inserted into a slit formed in a formwork and concrete is poured into the formwork, so that a part of the perforated steel dowel having holes is embedded in the concrete. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2015-229855 A [Patent Document 2] Patent No. 6807473 Summary of the Invention [Problem to be solved by the invention]

[0005] As mentioned above, the technology disclosed in Patent Document 1 can eliminate the need for on-site concrete pouring work, but there is room for improvement in that the split column-beam joints of a pair of precast beams may shift during an earthquake.

[0006] In consideration of the above, an object of the present invention is to suppress the displacement of a split column-beam joint between a pair of precast beams during an earthquake. [Means for solving the problem]

[0007] The first aspect is a column-beam connection structure comprising a precast column, a pair of precast beams each having a split column-beam connection section at each end that divides the column-beam connection section of the precast column into left and right halves, and which are placed on the precast column with their joint surfaces facing each other, and a steel plate joined across the left and right split column-beam connection sections and having a shear force transmission means.

[0008] In the first embodiment of the beam-column joint structure, a pair of precast beams has split beam-column joints at the ends, which are the left and right parts of the beam-column joint of the precast columns. These split beam-column joints are placed on the precast columns with their joint surfaces facing each other.

[0009] Here, the split column-beam joints are connected to each other by steel plates having shear force transmission means, which suppresses displacement of the split column-beam joints during an earthquake, thereby improving earthquake resistance.

[0010] A second aspect is the column-beam joint structure according to the first aspect, in which the shear force transmission means is a hole formed in the steel plate.

[0011] In the second embodiment of the beam-column joint structure, the shear force transmission means is a hole formed in the steel plate, and therefore the structure is simpler than, for example, the case where the shear force transmission means is a protrusion protruding from the plate surface of the steel plate.

[0012] A third aspect is a column-beam joint structure described in the second aspect, in which an anchor plate is provided at the tip of the main beam reinforcement of a pair of the precast beams, and the anchor plate is located on the joint surface side of the hole in the steel plate.

[0013] In the third embodiment of the beam-column joint structure, the tensile force acting on the main beam reinforcement of a pair of precast beams is transmitted from the anchor plate provided at the tip to the steel plate through the hole in the steel plate. Effect of the Invention

[0014] According to the present invention, it is possible to suppress the shifting of the split column-beam joint of a pair of precast beams during an earthquake. [Brief description of the drawings]

[0015] [Figure 1] 1 is a vertical cross-sectional view taken along line 1-1 in FIG. 2, showing a lower precast column and a pair of precast beams to which a beam-column joint structure according to one embodiment is applied. [Diagram 2] FIG. 2 is a horizontal cross-sectional view taken along line 2-2 in FIG. [Diagram 3] FIG. 2 is a front view of the steel plate as viewed from the Y direction. [Figure 4] FIG. 2 is a schematic diagram [Diagram 5] 1A and 1B are elevation views illustrating a construction method for a beam-column joint structure according to one embodiment. [Figure 6] 3 is a horizontal cross-sectional view corresponding to FIG. 2 and showing a first modified example of a beam-column joint structure according to one embodiment. [Figure 7] 4 is a horizontal cross-sectional view corresponding to FIG. 2 and showing a second modified example of a beam-column joint structure according to one embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] <Embodiment> A column-beam joint structure according to an embodiment of the present invention will be described. The two directions perpendicular to the horizontal direction are the X direction and the Y direction, which are indicated by the arrows X and Y, respectively. The vertical direction perpendicular to the X direction and the Y direction is the Z direction, which is indicated by the arrow Z.

[0017] (Column beam joint structure) First, the specific structure of the column-beam structure will be described.

[0018] As shown in Figures 1 and 2, the column-beam joint structure 100 according to this embodiment includes a lower precast column 10 (see Figure 1), an upper precast column 20 (see Figure 1), and a pair of precast beams 30. The lower precast column 10 (see Figure 1) is an example of a precast column. The column-beam joint 16 is composed of a pair of divided column-beam joints 34 split into left and right parts.

[0019] The longitudinal direction of the precast beam 30 is defined as the X direction, and the beam width direction is defined as the Y direction. The X direction is also defined as the left-right direction.

[0020] As shown in Fig. 1, the lower precast column 10 is made of precast concrete. The cross-sectional shape of the lower precast column 10 is rectangular. A plurality of main column reinforcements 12 and a plurality of shear reinforcements 14 are embedded in the outer periphery of the lower precast column 10.

[0021] The multiple column main reinforcements 12 of the lower precast column 10 are arranged along the Z direction, which is the material axis direction of the lower precast column 10. In addition, the multiple column main reinforcements 12 are arranged at intervals in the circumferential direction of the lower precast column 10. The upper ends of these column main reinforcements 12 protrude upward from the outer periphery of the upper surface 10U of the lower precast column 10. In addition, an upper precast column 20 is joined to the upper side of the lower precast column 10 via a column-beam joint portion 16.

[0022] The upper precast column 20 is made of precast concrete. The cross-sectional shape of the upper precast column 20 is rectangular like the lower precast column 10. A plurality of main column reinforcements 22 and a plurality of shear reinforcements 24 are embedded in the outer periphery of the upper precast column 20. The cross-sectional shapes of the lower precast column 10 and the upper precast column 20 can be changed as appropriate.

[0023] The multiple column main reinforcements 22 of the upper precast column 20 are arranged along the Z direction, which is the material axis direction of the upper precast column 20. The multiple column main reinforcements 22 are also arranged at intervals in the circumferential direction of the upper precast column 20. The lower end side of each column main reinforcement 22 is inserted into a mechanical joint 26.

[0024] The multiple mechanical joints 26 are embedded in the lower end of the upper precast column 20 and open to the lower surface 20L of the upper precast column 20. Multiple column main reinforcements 12 protruding from the upper surface 10U of the lower precast column 10 are inserted into the lower ends of these mechanical joints 26. In this state, the column main reinforcements 12 of the lower precast column 10 and the column main reinforcements 22 of the upper precast column 20 are connected via the mechanical joints 26 by filling the inside of each mechanical joint 26 with a filler G such as grout or mortar.

[0025] 1 and 2, a pair of precast beams 30 are formed from precast concrete. Each precast beam 30 has a beam portion 32 and a pair of split beam-column joints 34 (see also FIG. 4).

[0026] The beam section 32 is made of ordinary concrete, but is not limited to this. The cross-sectional shape of the beam section 32 is rectangular. A split beam-column joint 34 is formed at each end of the beam section 32 in the longitudinal direction (material axis direction (X direction)) (see also FIG. 4).

[0027] In this embodiment, the divided beam-column joint 34 is formed of fiber-reinforced concrete, but is not limited to this. The fiber-reinforced concrete in this embodiment is concrete mixed with fibers such as steel fibers, glass fibers, carbon fibers, and organic fibers.

[0028] The width in the Y direction of the divided column-beam joint portion 34 is made wider than the beam width of the beam portion 32 (see Figs. 2 and 4). The width in the Y direction of this divided column-beam joint portion 34 is made approximately the same as the width in the Y direction of the lower precast column 10 (see Fig. 1) and the upper precast column 20 (see Fig. 1).

[0029] The split column-beam connection 34 is placed on one side (approximately half of one side) of the upper surface 10U of the lower precast column 10 (see FIG. 1). This split column-beam connection 34 forms approximately half of the column-beam connection 16. In other words, the split column-beam connection 34 divides the column-beam connection 16 approximately in half on the left and right (horizontal direction) (see also FIG. 4). Note that the division position of the column-beam connection 16 is not limited to approximately half and can be changed as appropriate.

[0030] A plurality of beam main reinforcements 36 are embedded in the precast beam 30. The beam main reinforcements 36 are arranged along the X direction, which is the material axis direction of the precast beam 30. The beam main reinforcements 36 are embedded in the upper end side and the lower end side of the precast beam 30 (see FIG. 1). The beam main reinforcements 36 are arranged at intervals in the Y direction, which is the beam width direction of the precast beam 30 (see FIG. 2). The beam main reinforcements 36 are arranged across the beam section 32 and the split beam-column joint section 34. The beam section 32 has shear reinforcement bars 37 embedded therein, surrounding the beam main reinforcements 36.

[0031] The tip of each of the beam main reinforcements 36 reaches the split column-beam joint 34. An anchor 38 having an anchor plate 39 at its tip is provided at each of the tips of the left and right beam main reinforcements 36 (see also FIG. 4). Each anchor 38 is mechanically fixed, for example, by a plate nut, and is embedded in the split column-beam joint 34. These anchors 38 increase the anchor strength between the split column-beam joint 34 and the beam main reinforcements 36. The anchors 38 can be omitted as appropriate.

[0032] A plurality of insertion holes 40 are formed on the outer periphery of each divided column-beam connection portion 34. The plurality of insertion holes 40 penetrate the divided column-beam connection portion 34 in the up-down direction. The plurality of insertion holes 40 are also arranged at intervals in the circumferential direction of the column-beam connection portion 16. These insertion holes 40 are formed by embedding a sheath pipe (cylindrical pipe) 42 in the divided column-beam connection portion 34.

[0033] A plurality of shear reinforcement bars 50 that reinforce (shear reinforce) the column-beam joint 16 are embedded in the divided column-beam joint 34. The plurality of shear reinforcement bars 50 are formed in a rectangular ring shape along the outer periphery of each divided column-beam joint 34 in a plan view, and are arranged so as to surround the outside of the sheath pipe 42 (see FIG. 2).

[0034] As shown in Figures 1, 2 and 4, a steel plate 120 (see also Figure 3) having a plurality of holes 122 formed therein as an example of a shear force transmission means is embedded in one of the split column-beam joint portions 34 on the right side of the figures, and protrudes from the joint surface 34T described later.

[0035] As shown in Fig. 1 and Fig. 3, in this embodiment, two rows of holes 123, each having a plurality of holes 122 aligned in the vertical direction, are formed. One row of holes 123 on the right side of the figure is formed in a portion of the steel plate 120 embedded in one divided column-beam joint portion 34, and the other row of holes 123 on the left side of the figure is formed in a portion of the steel plate 120 protruding from the joint surface 34T. In this embodiment, the steel plate 120 is embedded in both sides in the beam width direction (Y direction) as shown in Fig. 2 and Fig. 4, but is not limited to this.

[0036] As shown in Figures 1 and 3, a groove portion 150 is formed on the joint surface 34T of the other split column-beam joint portion 34 on the left side of the figure, into which a steel plate 120 protruding from one of the split column-beam joint portions 34 on the right side of the figure is inserted.

[0037] As shown in Figures 1 and 2, a pair of left and right precast beams 30 are placed on the upper surface 10U of the lower precast column 10 (see Figure 1) with the joint surfaces 34T of each split column-beam joint portion 34 facing (close to each other) (see also Figure 4).

[0038] At this time, the steel plate 120 protruding from one divided column-beam connection part 34 on the right side in Figures 2 and 4 is inserted into the groove part 150 of the other divided column-beam connection part 34 on the left side in the figures. Also, a plurality of column main reinforcements 12 protruding from the upper surface 10U of the lower precast column 10 are inserted (penetrated) in the vertical direction into a plurality of insertion holes 40 (sheath tubes 42) of the divided column-beam connection part 34 (see also Figure 5).

[0039] In this state, by filling each insertion hole 40 (sheath tube 42) with a filling material G, the divided column-beam joint portion 34 is fixed to the lower precast column 10 (see FIG. 1) via the multiple column main reinforcements 12.

[0040] 2 and 4, the gaps at the joint surfaces 34T of the opposing divided column-beam connections 34 are filled with filler G. Furthermore, the grooves 150 are also filled with filler G, and the steel plates 120 inserted into the grooves 150 are embedded. In this way, adjacent divided column-beam connections 34 are joined together, and a column-beam connection 16 is formed (see also FIG. 1).

[0041] As shown in Fig. 4, the anchors 38 at the tips of the left and right beam main reinforcements 36 are located closer to the joint surface 34T than the holes 122 of the steel plate 120. To explain in more detail, the position M of the anchor plate 39 of the anchors 38 is located closer to the joint surface 34T than the position L1 of the tip of the hole 122.

[0042] (Column beam joint structure) Next, an example of a construction method for the beam-column joint structure according to this embodiment will be described.

[0043] Fig. 5(A) shows three lower precast columns 10 installed at intervals in the horizontal direction. For ease of explanation, the three lower precast columns 10 will be referred to as lower precast column 10A, precast column 10B, and precast column 10C from the left, and the precast beams 30 erected on the adjacent lower precast columns 10A, 10B, and 10C will be referred to as precast beam 30E and precast beam 30F from the left.

[0044] First, the divided column-beam joints 34 on both sides of the precast beam 30E are placed on the upper surfaces 10U of the adjacent lower precast columns 10A, 10B. At this time, each divided column-beam joint 34 is placed on one of the left and right sides of the upper surface 10U of the lower precast columns 10A, 10B. In addition, the multiple column main reinforcements 12 protruding from the upper surfaces 10U of the lower precast columns 10A, 10B are inserted into the multiple insertion holes 40 (sheath tubes 42, see Figures 1 and 2) of the divided column-beam joints 34, and protrude from the upper surfaces 34U of the divided column-beam joints 34.

[0045] In addition, the gap between the upper surface 10U of the lower precast column 10 and the lower surface of the column-beam joint 16 (the lower surface 34L of the divided column-beam joint 34) is appropriately filled with a filler such as grout or mortar for level adjustment (see Figure 1).

[0046] Next, the divided column-beam joints 34 on both sides of the precast beam 30F are placed on the upper surfaces 10U of the adjacent lower precast columns 10B, 10C. At this time, the divided column-beam joints 34 are placed on either the left or right side of the upper surfaces 10U of the lower precast columns 10B, 10C. In addition, the multiple column main reinforcements 12 protruding from the upper surfaces 10U of the lower precast columns 10B, 10C are inserted into the multiple insertion holes 40 (sheath tubes 42, see Figures 1 and 2) of each divided column-beam joint 34, respectively, so that they protrude from the upper surfaces 34U of the divided column-beam joints 34.

[0047] Here, as shown in Figure 2, a pair of precast beams 30E, 30F are arranged so that the joint surfaces 34T of each split column-beam joint portion 34 face each other and are close to each other, and the steel plate 120 protruding from one split column-beam joint portion is inserted into the groove portion 150 of the other split column-beam joint portion 34 (see also Figure 4).

[0048] Next, the filling material G is filled into the multiple insertion holes 40 (sheath pipes 42) of each divided column-beam joint 34. As a result, each divided column-beam joint 34 is joined to the lower precast column 10 via the multiple column main reinforcements 12.

[0049] Furthermore, the gaps (joints) and grooves 150 of the joint surfaces 34T of the adjacent divided column-beam connections 34 are filled with filler G. As a result, the adjacent divided column-beam connections 34 are joined together, and the column-beam connections 16 are formed (see also FIG. 4).

[0050] Next, as shown in Fig. 5(B), the upper precast column 20 is placed on the top surface of the column-beam connection 16 formed by the adjacent divided column-beam connections 34. At this time, as shown in Fig. 1, the multiple column main reinforcements 12 of the lower precast column 10 protruding from the top surface 34U of each divided column-beam connection 34 are inserted into the multiple mechanical joints 26 embedded in the lower end of the upper precast column 20. In this state, the mechanical joints 26 are filled with filler G. As a result, the column main reinforcements 12 of the lower precast column 10 and the column main reinforcements 22 of the upper precast column 20 are connected via the mechanical joints 26.

[0051] In addition, the gap between the upper surface of the column-beam joint 16 (upper surface 34U of the divided column-beam joint 34) and the lower surface 20L of the upper precast column 20 is appropriately filled with a filler such as grout or mortar for level adjustment.

[0052] The order of the above-mentioned construction steps (procedures) may be changed as appropriate depending on the situation.

[0053] <Action and Effects> Next, the operation and effects of this embodiment will be described.

[0054] In the beam-column joint structure 100 of this embodiment, a pair of precast beams 30 have split beam-column joints 34 at their ends, which are the left and right parts of the beam-column joint 16 of the lower precast column 10. These split beam-column joints 34 are placed on the lower precast column 10 with their joint surfaces 34T facing each other.

[0055] Here, the divided column-beam joints 34 are connected to each other by a steel plate 120 having a plurality of holes 122, which suppresses the displacement of the divided column-beam joints 34 during an earthquake, thereby improving earthquake resistance.

[0056] The multiple holes 122 in the steel plate 120 function as shear force transmission means, and the shear force is transmitted. Also, compared to the case where the shear force transmission means is a protrusion protruding from the plate surface of the steel plate 120, for example, the structure is simpler and the width can be made smaller.

[0057] The tensile force acting on the beam main reinforcement 36 of the pair of left and right precast beams 30 is transmitted from the anchors 38 provided at the ends to the steel plate 120 through the holes 122 in the steel plate 120, and is further transmitted between the left and right split beam-column connections 34 via the steel plate 120. Therefore, the shifting of the split beam-column connections 34 during an earthquake is further suppressed.

[0058] Here, as shown in Fig. 4, the anchors 38 at the tips of the left and right beam main reinforcements 36 are located closer to the joint surface 34T than the holes 122 of the steel plate 120. To explain in more detail, the position M of the anchor plate 39 of the anchor 38 is located closer to the joint surface 34T than the position L1 of the tip of the hole 122. Therefore, the tensile force acting on the beam main reinforcements 36 is effectively transmitted from the anchor plate 39 to the steel plate 120 via the holes 122 of the steel plate 120.

[0059] It is preferable that the position M of the fixing plate 39 of the fixing body 38 is located closer to the joining surface 34T than the position L1 of the tip of the hole 122, but this is not limited thereto. It is sufficient that the position M of the fixing plate 39 is located closer to the joining surface 34T than the position L2 of the rear end of the hole 122.

[0060] Furthermore, even if the position M of the anchor plate 39 is not located closer to the joint surface 34T than the position L2 of the rear end of the hole 122, the effect of increasing the joint strength between the end of the beam main reinforcement 36 and the divided beam-column joint portion 34 is achieved. Therefore, in this embodiment, a mechanical joint or the like for connecting the beam main reinforcement 36 of the pair of precast beams 30 (30X, 30Y) can be omitted. Therefore, the workability of the pair of precast beams 30 is further improved.

[0061] In addition, because adjacent beam-column joints 34 are formed of fiber-reinforced concrete, the splitting strength of the beam-column joints 34 is increased. This makes it possible to reduce the number of shear reinforcements 50 embedded in the beam-column joints 34. This simplifies the structure of the beam-column joints 34, improving the manufacturability of the pair of precast beams 30.

[0062] <Modification> Next, a modification of this embodiment will be described.

[0063] [First modified example] In the first modified example shown in FIG. 6, a steel beam 200 is connected to a connection member 250 fixed to a side surface of the beam-column connection portion 16.

[0064] The connection member 250 is configured such that a fixing plate 252 and a connection plate 254 form a T-shape in a plan view. The fixing plate 252 is fastened and fixed with nuts 222 to anchor bolts 220 embedded in the left and right divided column-beam joints 34 that constitute the column-beam joint portion 16.

[0065] The steel beam 200 is composed of an H-shaped steel having a flange 202 and a web 204. The web 204 of the steel beam 200 is connected to a connection plate 254 of a connection member 250 by fastening with a bolt 260 and a nut 262.

[0066] The connection plate 254 of the connection member 250 is fixed across the left and right divided column-beam joints 34. This further reduces displacement of the divided column-beam joints 34 during an earthquake.

[0067] [Second Modification] In a second modified example shown in FIG. 7, a reinforced concrete beam 300 is joined to the side surface of the beam-column connection portion 16.

[0068] The reinforced concrete beam 300 is provided with beam reinforcing bar ends 302 and beam reinforcing bar bodies 304. The beam reinforcing bar ends 302 and beam reinforcing bar bodies 304 are surrounded by a plurality of shear reinforcement bars (not shown).

[0069] Beam main bar end portions 302 are embedded and protrude from the left and right split column-beam joint portions 34 that constitute the column-beam joint portion 16. An anchor 310 is provided at the tip of the beam main bar end portion 302. A beam main bar body 304 is connected to the beam main bar end portion 302 via a mechanical joint 306.

[0070] The reinforced concrete beam 300 is fixed across the left and right divided column-beam joints 34. This further reduces displacement of the divided column-beam joints 34 during an earthquake.

[0071] <Other> The present invention is not limited to the above embodiment.

[0072] For example, in the above embodiment, two rows of holes 123, each having a plurality of holes 122 aligned in the vertical direction, are formed, but this is not limited thereto. Three or more rows of holes 123 may be formed.

[0073] Also, for example, in the above embodiment, the steel plate 120 is embedded in advance in one of the divided column-beam joint portions 34, but this is not limited to this. The steel plate 120 may not be embedded in either of the divided column-beam joint portions 34, and the groove portion 150 may be formed in the joint surface 34T of both divided column-beam joint portions 34.

[0074] Also, for example, in the above embodiment, the steel plate 120 is provided on both sides in the beam width direction (Y direction), but this is not limited to this. The steel plate 120 may be provided in one or three or more locations. The steel plate 120 may be divided in the vertical direction. In other words, a plurality of steel plates may be provided lined up in the vertical direction.

[0075] Also, for example, in the above embodiment, the shear force transmission means is the hole 122 formed in the steel plate 120, but is not limited to this. For example, the shear force transmission means may be a protrusion such as a stud protruding from the plate surface of the steel plate 120. Alternatively, the shear force transmission means may be a concave or convex portion formed on the plate surface of the steel plate 120. Alternatively, the shear force may be transmitted by forming the steel plate 120 in a curved wave shape.

[0076] Also, for example, a recess (cotter) into which the filler G is filled may be formed on the joint surface 34T of the divided column-beam joint portion 34.

[0077] In addition, for example, in the above embodiment, the divided beam-column joint 34 is formed of fiber-reinforced concrete, but is not limited to this. For example, the divided beam-column joint 34 may be formed of ordinary concrete.

[0078] Also, for example, in the above embodiment, the column main reinforcements 12 protruding from the upper surface of the lower precast column 10 are inserted into the multiple insertion holes 40 (sheath pipes 42) of the divided column-beam joint section 34, but the present invention is not limited to this. The column main reinforcements protruding from the lower surface of the upper precast column 20 may be inserted into the multiple insertion holes 40 (sheath pipes 42) of the divided column-beam joint section 34. In this case, for example, the column main reinforcements 22 of the upper precast column 20 penetrate the divided column-beam joint section 34 in the vertical direction and are connected to the column main reinforcements 12 of the lower precast column 10 via a mechanical joint embedded in the upper end of the lower precast column 10.

[0079] Also, for example, in the above embodiment, the precast beam 30 is formed of full precast concrete. However, the precast beam may be formed of half precast concrete. In other words, the precast beam in the above embodiment is a concept including a full precast beam and a half precast beam.

[0080] Furthermore, the present invention can be embodied in various forms without departing from the spirit and scope of the present invention. A plurality of embodiments and modifications can be implemented in appropriate combination. [Explanation of symbols]

[0081] 10 Lower precast column (an example of a precast column) 10U top 16 Column and beam joint section 30 Precast Beam 32 Beam section 34 Split column and beam joint section 36 Main beam reinforcement 39 Fixing plate 100 Column beam joint structure 120 steel plate 122 Hole (an example of a means of transmitting shear force)

Claims

1. Precast columns and A pair of precast beams each having a split column-beam joint portion at one end, the split column-beam joint portion being formed by dividing the column-beam joint portion of the precast column into a left and a right part, the split column-beam joint portion being placed on the precast column with their joint surfaces facing each other; A steel plate joined across the left and right divided column-beam joints and having a shear force transmission means; Equipped with the shear force transmission means is a hole formed in the steel plate, An anchor plate is provided at the tip of the beam main reinforcement of the pair of precast beams, The fixing plate is located on the joining surface side of the hole of the steel plate. Column beam joint structure.

2. A precast column; A pair of precast beams each having a split column-beam joint portion at one end, the split column-beam joint portion being formed by dividing the column-beam joint portion of the precast column into a left and a right part, the split column-beam joint portion being placed on the precast column with their joint surfaces facing each other; A steel plate having a shear force transmission means, one end of which is embedded in one of the divided column-beam joints and the other end of which protrudes from the joint surface and is inserted into a groove formed in the other divided column-beam joint; A filler material is filled in the groove portion and integrates the one divided column-beam joint portion and the other divided column-beam joint portion; A column-beam joint structure.

3. The shear force transmission means is a hole formed in the steel plate, The column-beam joint structure according to claim 2.

4. An anchor plate is provided at the tip of the beam main reinforcement of the pair of precast beams, The fixing plate is located on the joining surface side of the hole of the steel plate. The column-beam joint structure according to claim 3.

5. A fixing plate of a connecting member to which a steel beam is connected is arranged across the side surfaces of the left and right split column-beam joint parts, The fixing plate is fastened and fixed to the anchor bolts embedded in the left and right divided column-beam joints with nuts. The column-beam joint structure according to any one of claims 1 to 4.

6. A ring-shaped shear reinforcement bar is embedded in each of the divided column-beam joints on one side and the divided column-beam joints on the other side. The column-beam joint structure according to any one of claims 1 to 5.

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