Joining structure of structural members

Abstract

The present invention provides a joint structure for structural members that can reduce component costs and increase axial adhesion strength. [Solution] The joining structure for a pair of frame members (column body members 4-4) arranged in a straight line comprises a concrete connecting block 5 placed between the pair of frame members (4-4), a plurality of metal connecting rods 7 having an embedded intermediate portion 7a embedded in the connecting block 5 so as to penetrate the connecting block 5, and a pair of extended ends 7b with male threads 8 extending in both directions from the connecting block 5 to connect the frame members (4-4), and an adhesion force enhancing portion (nut 9) provided on each of the connecting rods 7 to enhance the axial adhesion strength to the connecting block 5.

Description

Technical Field

[0001] The present invention relates to a joining structure of a pair of linearly arranged structural members.

Background Art

[0002] As a joining structure of wooden members such as columns and beams, holes are formed in each of a pair of wooden members to be joined to each other, a rod-shaped member is embedded in the pair of holes, and a predetermined adhesive or non-shrink mortar is filled in the holes to join the pair of wooden members (Patent Document 1). In the invention described in Patent Document 1, in order to ensure high joining strength and stable strength reduction characteristics, the holes are configured to have a diameter that is substantially larger than the diameter at the opening over a predetermined range along the extending direction thereof.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

[0006] Here, in order to increase the joint strength per unit length, it is conceivable to use concrete blocks as connecting members and connect the structural members via these blocks. Furthermore, it is conceivable to use screw bolts as rod-shaped members for connecting structural members such as columns and beams.

[0007] However, if a screw bolt is embedded in a concrete connecting block, repeated stress can cause the cement paste in the threaded portion to shear and break, leading to the screw bolt shifting out of the connecting block.

[0008] In view of the above background, the present invention aims to provide a joint structure for structural members that can reduce material costs and increase axial adhesion strength. [Means for solving the problem]

[0009] To solve the above problems, one aspect of the present invention provides a joining structure for a pair of linearly arranged structural members (4·4, 6·6), comprising: a concrete connecting block (5) arranged between the pair of structural members; a plurality of metal connecting rods (7) having an embedded intermediate portion (7a) embedded in the connecting block so as to penetrate the connecting block, and a pair of extended ends (7b) with male threads (8) extending in both directions from the connecting block to connect the structural members; and adhesion force enhancing portions (9, 51, 61, 71, 81) provided on each of the connecting rods to enhance the axial adhesion strength to the connecting block.

[0010] In this embodiment, since the connecting blocks placed between a pair of structural members are made of concrete, the cost of the members can be reduced. In addition, since each connecting rod is provided with an adhesion force enhancing section, the adhesion strength of each connecting rod to the connecting block is increased.

[0011] In the above embodiment, each of the structural members (4) constitutes the main body of the column (2), and the connecting block constitutes the joint of the column.

[0012] In this embodiment, the extended end of the connecting rod is connected to the main body members of a pair of columns arranged in a straight line in the vertical direction. Even when an axial force is transmitted from the main body members of the columns to the connecting rod, the bond strength to the connecting block is increased, thereby suppressing displacement that would cause each connecting rod to detach from the connecting block.

[0013] In the above embodiment, each of the structural members (6) constitutes a beam (3), and the connecting block constitutes the joint portion of the column (2).

[0014] In this embodiment, the extended ends of the connecting rods are connected to a pair of beam members arranged in a straight line horizontally. Even when axial force is transmitted from the beam members to the connecting rods, the bond strength to the connecting blocks is increased, thereby suppressing displacement that would cause each connecting rod to detach from the connecting blocks.

[0015] In the above embodiment, each of the structural members is preferably made of wood and joined to the connecting rod by adhesive (10).

[0016] According to this embodiment, the extended end of the connecting rod can be securely joined to the wooden frame member by bonding it with adhesive around its entire circumference, thereby connecting the frame members to each other.

[0017] In the above embodiment, each of the frame members preferably includes a wooden main body member (21) and a metal connecting plate (22) joined to the end grain of the main body member, wherein the connecting plate has a plurality of through holes (25) through which the extended end of the connecting rod is inserted, and is joined to the connecting block by a plurality of fastening nuts (26) that are screwed onto the extended end.

[0018] According to this embodiment, wooden structural members can be reliably joined to connecting blocks by a mechanical joining structure.

[0019] In the above aspect, each of the structural members includes a steel frame main body member (31) and an end plate (32) joined to an end face of the main body member. The end plate is provided with a plurality of through holes (25) through which the extending end portions of the connection rods are inserted, and may be joined to the connection block by a plurality of fastening nuts (26) screwed onto the extending end portions.

[0020] According to this aspect, a steel frame structural member can be reliably joined to a connection block using a plurality of fastening nuts.

[0021] In the above aspect, the embedded intermediate portion of the connection rod may be provided with a male thread (8), and each of the adhesion enhancing portions may include a nut (9) screwed onto the embedded intermediate portion.

[0022] According to this aspect, an adhesion enhancing portion can be easily formed on the embedded intermediate portion by a nut.

[0023] In the above aspect, each of the adhesion enhancing portions may include a double nut formed by two nuts (9, 9) abutting against each other.

[0024] According to this aspect, displacement of the nut can be prevented during construction such as when placing concrete.

[0025] In the above aspect, each of the adhesion enhancing portions may include a pair of high nuts (51) abutting against opposite faces of the connection block, and the extending end portion may be connected to the embedded intermediate portion via the corresponding high nut.

[0026] According to this aspect, the length of the extending end portion of the connection rod can be appropriately changed. Therefore, the versatility of the connection block is improved. Also, since the extending end portion can be removed from the connection block during transportation or the like, handling of the connection block becomes easy.

[0027] In the above aspect, each of the adhesion force enhancing portions may include a pair of high nuts (61) embedded in opposite surfaces of the connection block, and the extending end portion may be connected to the embedded intermediate portion through the corresponding high nut.

[0028] According to this aspect, the length of the extending end portion of the connection rod can be appropriately changed. Therefore, the versatility of the connection block is improved. Also, since the extending end portion can be removed from the connection block during transportation or the like, the handling of the connection block becomes easy. In addition, since the pair of high nuts are embedded in the connection block, the high nuts do not separate from the connection block, and the adhesion endurance of the connection rod can be reliably enhanced.

[0029] In the above aspect, the embedded intermediate portion of the connection rod may be made of deformed steel bars, and each of the adhesion force enhancing portions may be constituted by the uneven shape (71) of the deformed steel bars formed on the outer surface of the embedded intermediate portion.

[0030] According to this aspect, a connection rod provided with an adhesion force enhancing portion can be manufactured by using deformed steel bars, which are general-purpose products. Therefore, the manufacturing cost of the connection rod can be reduced.

[0031] In the above aspect, the embedded intermediate portion of the connection rod may be provided with male threads (8), and each of the adhesion force enhancing portions may include a plurality of nuts (9) screwed onto the embedded intermediate portion and a pressure plate (81) sandwiched between the nuts.

[0032] According to this aspect, the adhesion endurance of the connection rod can be easily changed by changing the size of the pressure plate.

Effects of the Invention

[0033] According to the above aspects, it is possible to provide a joining structure of a structural member that can reduce the member cost and enhance the axial adhesion endurance.

Brief Description of the Drawings

[0034] [Figure 1] Side cross-sectional view of the joint structure in the building according to the first embodiment [Figure 2] Side cross-sectional view of the joint structure cut at a different position than in Figure 1. [Figure 3] Side cross-sectional view of the joint structure in a different column from Figure 1. [Figure 4] Side cross-sectional view of the joint structure in the building according to the second embodiment. [Figure 5] Side cross-sectional view of the joint structure cut at a different position than Figure 4. [Figure 6] Side cross-sectional view of the joint structure in the building according to the third embodiment. [Figure 7] Side cross-sectional view of the joint structure cut at a different position than Figure 6. [Figure 8] Side cross-sectional view of the joint structure in the building according to the fourth embodiment. [Figure 9] Side cross-sectional view of the joint structure in the building according to the fifth embodiment. [Figure 10] Side cross-sectional view of the joint structure in the building according to the sixth embodiment. [Figure 11] Side cross-sectional view of the joint structure in the building according to the seventh embodiment. [Figure 12] Side cross-sectional view of the joint structure in the building according to the 8th embodiment [Figure 13] Side cross-sectional view of the joint structure in the building according to the 9th embodiment [Modes for carrying out the invention]

[0035] Several embodiments of the present invention will be described in detail below with reference to the drawings. ≪First Embodiment≫

[0036] First, a first embodiment of the present invention will be described with reference to Figures 1 to 3. Figure 1 is a side cross-sectional view of a joint structure in a building according to the first embodiment. As shown in Figure 1, the building has a rigid frame structure 1 (rigid frame) in at least the longitudinal direction. The left-right direction in Figure 1 is the longitudinal direction of the building, and the direction perpendicular to the plane of the paper in Figure 1 is the inter-beam direction of the building. The building may have a rigid frame structure in the inter-beam direction, or it may have a load-bearing wall structure.

[0037] The building's frame 1 has multiple columns 2 arranged at predetermined intervals in the longitudinal direction, and multiple beams 3 connecting adjacent columns 2 in the longitudinal direction. The building is a multi-story building with beams 3 extending over multiple floors for each level. The frame 1 is constructed as a wooden rigid frame, with the columns 2 and beams 3 being made of wood. However, the joints of the columns 2 to which the beams 3 are connected are made of concrete, specifically precast concrete members. Here, "made of concrete" means including concrete, and may be reinforced concrete (RC), fiber-reinforced concrete (FRC), prestressed concrete (PC), steel-reinforced concrete (SRC), etc.

[0038] Column 2 comprises a plurality of wooden column body members 4 and at least one concrete connecting block 5 that connects vertically adjacent column body members 4. Here, "wooden" means that wood is used as a structural member, and does not mean that it is not limited to wood. For example, reinforcing materials or reinforcements may be added to the wood. Each column body member 4 is a structural member that constitutes part of the frame 1. In this embodiment, each column body member 4 has a length that is approximately equal to the floor height of one story (more specifically, a length that is shorter than the floor height by the height of the connecting block 5). A pair of vertically adjacent column body members 4 are arranged linearly in the vertical direction above and below the connecting block 5.

[0039] The connecting block 5 is positioned at the joint of the column 2 and has the function of connecting the upper and lower column body members 4, as well as connecting the beam 3 to the column 2. However, the connecting block 5 that is joined to the top of the uppermost column body member 4 has the function of connecting the column 2 and the beam 3, but does not have the function of connecting the upper and lower column body members 4.

[0040] In other embodiments, the column body member 4 may have a length of approximately 1 / 2 or 1 / 3 of the floor height of one story, and the upper and lower column body members 4 may be connected to each other via a connecting block 5 located at the midpoint of the story. In this case, the connecting block 5 located at the midpoint of the story has the function of connecting the upper and lower column body members 4.

[0041] Beam 3 is composed of wooden beam members 6. Each beam member 6 is a structural member that constitutes part of the frame 1, and in this embodiment, each beam member 6 has a length corresponding to the span of the corresponding column 2. A pair of beam members 6 adjacent in the longitudinal direction are arranged linearly in the horizontal direction on both sides of the connecting block 5.

[0042] In other embodiments, the beam 3 may be composed of multiple wooden beam members 6 having a length shorter than the span. Axially adjacent beam members 6 may be connected via members similar to the connecting block 5, or they may be directly connected by tensioning forces from tensioning members or the like.

[0043] Multiple connecting rods 7 are provided in the connecting block 5 so as to penetrate the connecting block 5 vertically. Each connecting rod 7 has an embedded intermediate portion 7a embedded in the connecting block 5 and a pair of extended ends 7b extending from the connecting block 5 in both vertical and horizontal directions. The connecting rods 7 are made of fully threaded bolts (long screws without a head) in which male threads 8 are formed along the entire length of the outer surface of a metal rod. The connecting rods 7 are preferably made of high-tensile steel, but may also be made of general steel (mild steel) or other metals.

[0044] A nut 9 is screwed onto the buried intermediate portion 7a of the connecting rod 7. The nut 9 is an adhesion-enhancing member that increases the axial adhesion resistance of the connecting rod 7 to the connecting block 5. In this embodiment, one nut 9 is attached to the center of the buried intermediate portion 7a.

[0045] Multiple holes 4a are formed in the upper surface of the column body member 4 located below the connecting block 5 and in the lower surface of the column body member 4 located above the connecting block 5, for receiving the corresponding extended end 7b of the connecting rod 7. Each hole 4a has a cross-sectional shape larger than the cross-sectional shape of the extended end 7b of the connecting rod 7, and adhesive 10 is filled inside the hole 4a (between the inner surface of the hole 4a and the extended end 7b) to bond the extended end 7b of the connecting rod 7 to the column body member 4. As a result, the extended end 7b of each connecting rod 7 is joined to the column body member 4, and the column body member 4 is joined to the connecting block 5 via the connecting rod 7.

[0046] In this embodiment, the adhesive 10 is filled into the hole 4a along its entire length. The extended end 7b of the connecting rod 7 is securely joined to the corresponding column body member 4 by being equipped with a male screw 8. In other embodiments, the adhesive 10 may be filled only into the bottom side of the hole 4a. Also, although nothing is screwed onto the extended end 7b of the connecting rod 7 in the illustrated example, a nut for enhancing adhesion may be screwed onto the portion of the extended end 7b that is filled with adhesive 10. This increases the adhesive strength (axial adhesion force) of the extended end 7b to the adhesive 10.

[0047] Figure 2 is a side cross-sectional view of the joint structure cut at a different position than in Figure 1. As shown in Figure 2, the connecting block 5 is provided with multiple connecting rods 7 that penetrate the connecting block 5 in the longitudinal direction (horizontally). Each connecting rod 7 has the same configuration as the one described in Figure 1, except that its direction of extension is different.

[0048] Multiple holes 6a are formed in the end faces of the beam members 6 on both sides of the connecting block 5 to receive the corresponding extended ends 7b of the connecting rods 7. Each hole 6a has a cross-sectional shape larger than the cross-sectional shape of the extended end 7b of the connecting rod 7, and adhesive 10 is filled inside the holes 6a (between the inner surface of the hole 6a and the extended end 7b) to bond the extended end 7b to the column body member 4. As a result, the extended end 7b of each connecting rod 7 is joined to the beam member 6, and the beam member 6 is joined to the connecting block 5 via the connecting rods 7.

[0049] In this embodiment, the adhesive 10 is filled into the hole 6a along its entire length. In other embodiments, the adhesive 10 used to bond the connecting rod 7 to the beam member 6 may be filled only into the bottom of the hole 6a. Additionally, a nut for enhancing adhesion may be screwed onto the portion of the extended end 7b where the adhesive 10 is filled.

[0050] Figure 3 is a side cross-sectional view of a joint structure in column 2 that differs from that in Figure 1. Specifically, column 2 in Figure 3 is an outer column located at the end of the building in the longitudinal direction, while column 2 in Figure 1 is an inner or outer column located in the middle of the building in the longitudinal direction.

[0051] As shown in Figure 3, in this column 2, a beam 3 is joined to one side in the longitudinal direction, but not to the other side. Multiple connecting rods 7 are embedded in the connecting block 5 of this column 2, extending from only one side of the connecting block 5. The embedded intermediate portion 7a of each connecting rod 7 has its end at a predetermined cover thickness away from the other side of the connecting block 5.

[0052] The frame 1 of this embodiment is configured as described above. A pair of column body members 4 arranged in a straight line are joined by the joint structure shown in Figure 1, and a pair of beam members 6 arranged in a straight line are joined by the joint structure shown in Figure 2.

[0053] Thus, since the connecting blocks 5, which are placed between a pair of column body members 4 and between a pair of beam members 6, are made of concrete, the cost of the components is reduced compared to when they are made of steel. Furthermore, nuts 9 are provided on each of the connecting rods 7 as adhesion-enhancing members to increase the axial adhesion strength of the connecting rods 7 to the connecting blocks 5. As a result, the adhesion strength of each connecting rod 7 to the connecting blocks 5 is increased.

[0054] Since the buried intermediate portion 7a of the connecting rod 7 is equipped with a male thread 8 and a nut 9 that screws onto the buried intermediate portion 7a constitutes an adhesion force enhancing member, the adhesion force enhancing portion can be easily formed on the buried intermediate portion 7a.

[0055] As shown in Figure 1, each of the column body members 4, which are structural members, constitutes the main body of the column 2, and the connecting block 5 constitutes the joint portion of the column 2. Therefore, the extended end 7b of the connecting rod 7 is connected to a pair of column body members 4 that are arranged in a straight line in the vertical direction. Even when axial force is transmitted from the column body members 4 to the connecting rod 7, the bond strength to the connecting block 5 is increased, so that displacement that causes each connecting rod 7 to come out of the connecting block 5 is suppressed.

[0056] As shown in Figure 2, each of the beam members 6, which are structural members, constitutes a beam 3, and the connecting block 5 constitutes the joint portion of the column 2. Therefore, the extended end 7b of the connecting rod 7 is connected to a pair of beam members 6 that are arranged in a straight line in the horizontal direction. Even when axial force is transmitted from the beam members 6 to the connecting rod 7, the bond strength to the connecting block 5 is increased, so that displacement that causes each connecting rod 7 to come out of the connecting block 5 is suppressed.

[0057] Each of the structural members, the column body member 4 and the beam member 6, is made of wood and is joined to the connecting rod 7 with adhesive 10. Therefore, by bonding the extended end 7b of the connecting rod 7 all the way around with adhesive 10, it can be securely joined to the wooden column body member 4 or beam member 6, thereby connecting the column body members 4 to each other or the beam members 6 to each other. ≪Second Embodiment≫

[0058] A second embodiment of the present invention will be described with reference to Figures 4 and 5. In this embodiment, the connection structure between the column body member 4 and the beam member 6 and the connecting block 5 differs from that of the first embodiment. The same reference numerals are used for elements that are the same as or similar to those in the first embodiment, and redundant explanations are omitted. The same applies to subsequent embodiments unless otherwise specified.

[0059] Figure 4 is a side cross-sectional view of a joint structure in a building according to the second embodiment. As shown in Figure 4, the column body member 4 includes a wooden body member 21 and a metal connecting plate 22 joined to the end grain of the upper or lower end of the body member 21. The connecting plate 22 has a projection 23 that protrudes toward the body member 21, and an insertion hole 24 into which the projection 23 is inserted is formed in the end grain of the body member 21. The connecting plate 22 is joined to the body member 21 by, for example, filling the insertion hole 24 with adhesive 10 while the projection 23 is inserted into the insertion hole 24. The joining structure of the connecting plate 22 to the body member 21 and the configuration of the projection 23 may be known, for example, the structure or configuration described in Patent Document 2.

[0060] The connecting plate 22 has multiple through holes 25 through which the extended end 7b of the connecting rod 7 is inserted. The column body member 4 is joined to the connecting block 5 by multiple fastening nuts 26 that are screwed onto the extended end 7b, with the extended end 7b inserted through the through holes 25 of the connecting plate 22.

[0061] Figure 5 is a side cross-sectional view of the joint structure cut at a different position than in Figure 4. As shown in Figure 5, the beam member 6 includes a wooden main body member 21 and a metal connecting plate 22 joined to the end grain of the shaft end of the main body member 21. The connecting plate 22 has a projection 23 that protrudes toward the main body member 21, and an insertion hole 24 is formed in the end grain of the main body member 21 into which the projection 23 is inserted. The joining structure of the connecting plate 22 to the main body member 21 may be the same as that of the column main body member 4.

[0062] The connecting plate 22 has multiple through holes 25 through which the extended end 7b of the connecting rod 7 is inserted. The beam member 6 is joined to the connecting block 5 by multiple fastening nuts 26 that are screwed onto the extended end 7b, with the extended end 7b inserted through the through holes 25 of the connecting plate 22.

[0063] Thus, the column body member 4 and the beam member 6 each include a wooden body member 21 and a connecting plate 22, and the connecting plate 22 is joined to the connecting block 5 by a plurality of fastening nuts 26 that are screwed onto the extended end 7b of the connecting rod 7. In this way, the wooden column body member 4 and the beam member 6 are securely joined to the connecting block 5 by a mechanical joining structure. ≪Third Embodiment≫

[0064] A third embodiment of the present invention will be described with reference to Figures 6 and 7. This embodiment differs from the first embodiment in that the column body member 4 is made of steel.

[0065] Figure 6 is a side cross-sectional view of a joint structure in a building according to the third embodiment. As shown in Figure 6, the column body member 4 includes a steel frame body member 31 and an end plate 32 joined to the end face of the body member 31. The end plate 32 has a plurality of through holes 25 through which the extended end 7b of the connecting rod 7 is inserted. The column body member 4 is joined to the connecting block 5 by a plurality of fastening nuts 26 that are screwed onto the extended end 7b, with the extended end 7b inserted into the through holes 25 of the connecting plate 22.

[0066] Figure 7 is a side cross-sectional view of the joint structure cut at a different position than in Figure 6. As shown in Figure 7, the connecting block 5 is provided with a plurality of connecting rods 7 that penetrate the connecting block 5 in the longitudinal direction (horizontally). The beam member 6 is configured in the same manner as in the first embodiment and is joined to the connecting block 5 by the same joint structure as in the first embodiment.

[0067] Thus, in this embodiment, the column body member 4 is made of steel. As shown in Figure 6, the column body member 4 includes a steel body member 31 and an end plate 32 with multiple through holes 25, so that the steel column body member 4 is securely joined to the connecting block 5 using multiple fastening nuts 26. ≪Fourth Embodiment≫

[0068] A fourth embodiment of the present invention will be described with reference to Figure 8. Figure 8 is a side cross-sectional view of a joint structure in a building according to the fourth embodiment. In this embodiment, the configuration of the adhesion force enhancing part provided on the connecting rod 7 differs from that of the first embodiment in order to enhance the axial adhesion strength of the connecting rod 7 to the connecting block 5.

[0069] As shown in Figure 8, the embedded intermediate portion 7a of each connecting rod 7 is equipped with a male thread 8, and multiple nuts 9 are attached to the embedded intermediate portion 7a. In this embodiment, two nuts 9 are attached to each connecting rod 7. The two nuts 9 are spaced apart from each other and positioned on either side of the axial center of the embedded intermediate portion 7a of the connecting rod 7 (upper and lower parts of the connecting block 5), and are embedded in the connecting block 5.

[0070] In this way, since the adhesion-enhancing member is formed by a nut 9 that is screwed into the buried intermediate portion 7a, the adhesion-enhancing portion can be easily formed in the buried intermediate portion 7a. Furthermore, because the adhesion-enhancing portion provided on each connecting rod 7 includes multiple nuts 9, the bonding strength (axial adhesion resistance) of each connecting rod 7 to the connecting block 5 is enhanced compared to the case where it is formed by a single nut 9. ≪Fifth Embodiment≫

[0071] A fifth embodiment of the present invention will be described with reference to Figure 9. Figure 9 is a side cross-sectional view of a joint structure in a building according to the fifth embodiment. In this embodiment, the configuration of the adhesion force enhancing part provided on the connecting rod 7 differs from that of the fourth embodiment.

[0072] As shown in Figure 9, the two nuts 9 are positioned to abut each other on each connecting rod 7, forming a so-called double nut. This prevents the position of the nuts 9 from shifting during construction, such as when concrete is poured. ≪Sixth Embodiment≫

[0073] A sixth embodiment of the present invention will be described with reference to Figure 10. Figure 10 is a side cross-sectional view of a joint structure in a building according to the sixth embodiment. In this embodiment as well, the configuration of the adhesion force enhancing part provided on the connecting rod 7 differs from that of the first embodiment.

[0074] As shown in Figure 10, each connecting rod 7 is provided with two tall nuts 51. The two tall nuts 51 are positioned to contact the upper and lower surfaces of the connecting block 5. The embedded intermediate portion 7a and the pair of extended ends 7b of the connecting rod 7 are formed from separate components and connected in a straight line via the two tall nuts 51. The threaded member constituting the embedded intermediate portion 7a is designed to protrude slightly (about half the height of the tall nuts 51) upward and downward from the upper and lower surfaces of the connecting block 5, respectively. The two tall nuts 51 are screwed into the threaded member until they contact the corresponding upper or lower surface of the connecting block 5. In this way, the two tall nuts 51 function as adhesion-enhancing parts that increase the axial adhesion resistance of the connecting rod 7 to the connecting block 5.

[0075] The threaded member constituting the extended end 7b of the connecting rod 7 is screwed onto the corresponding tall nut 51 and connected to the embedded intermediate portion 7a via the tall nut 51. The extended end 7b of the connecting rod 7 is set to the length necessary for joining to the wooden column body member 4. In addition, the hole 4a formed in the end grain of the column body member 4 is set to a cross-sectional dimension that can receive the tall nut 51, at least near the end grain.

[0076] Thus, since the adhesion-enhancing section includes a pair of high nuts 51, and the extended end 7b of the connecting rod 7 is connected to the embedded intermediate section 7a via the corresponding high nuts 51, the length of the extended end 7b of the connecting rod 7 can be changed as appropriate. Therefore, the versatility of the connecting block 5 is improved. In addition, since the extended end 7b can be removed from the connecting block 5 during transportation, the handling of the connecting block 5 becomes easier.

[0077] However, if it is not necessary to change the length of the extended end 7b of the connecting rod 7 or to remove the extended end 7b, the adhesion-enhancing section may be composed of a pair of nuts 9 instead of a pair of high nuts 51. In other words, the two nuts 9 used in the fourth embodiment described with reference to Figure 8 may be screwed onto the extended end 7b of the connecting rod 7 instead of the embedded intermediate portion 7a, and positioned on the outside of the connecting block 5. In this case, the nuts 9 are positioned to be in contact with the connecting block 5. ≪Seventh Embodiment≫

[0078] A seventh embodiment of the present invention will be described with reference to Figure 11. Figure 11 is a side cross-sectional view of the joint structure in a building according to the seventh embodiment. In this embodiment, the arrangement of the high nuts 61 constituting the adhesion force enhancing section differs from that of the sixth embodiment. The differences from the fifth embodiment will be described below.

[0079] As shown in Figure 11, the two tall nuts 61 provided on each connecting rod 7 are embedded in the upper and lower surfaces of the connecting block 5. That is, the tall nuts 61 are embedded in the concrete of the connecting block 5 so that their end faces align with the corresponding upper or lower surfaces of the connecting block 5.

[0080] The threaded members constituting the buried intermediate section 7a are slightly shorter in length than the height of the connecting block 5 (approximately the height of the tall nuts 51). Therefore, each tall nut 51 forms a threaded hole in the corresponding upper or lower surface of the connecting block 5 to connect the extended end 7b. A pair of extended end 7b are screwed into the threaded holes of the two tall nuts 51 until they abut against the end surface of the buried intermediate section 7a.

[0081] In this way, by including a pair of high nuts 61 in the adhesion-enhancing section, the length of the extended end 7b of the connecting rod 7 can be appropriately changed. Therefore, the versatility of the connecting block 5 is improved. In addition, since the extended end 7b can be removed from the connecting block 5 during transportation, the handling of the connecting block 5 becomes easier. Furthermore, since the pair of high nuts 61 are embedded in the connecting block 5, the high nuts 61 do not separate from the connecting block 5, and the adhesion strength of the connecting rod 7 can be reliably enhanced. ≪Eighth Embodiment≫

[0082] An eighth embodiment of the present invention will be described with reference to Figure 12. Figure 12 is a side cross-sectional view of a joint structure in a building according to the eighth embodiment. In this embodiment as well, the configuration of the adhesion force enhancing part provided on the connecting rod 7 differs from that of the first embodiment.

[0083] As shown in Figure 12, the connecting rod 7 is made of deformed reinforcing bars with male threads 8 formed at both ends. The deformed reinforcing bars are preferably made of high-tensile steel, but may also be made of general steel (mild steel) or other metals. The embedded intermediate portion 7a of the connecting rod 7 does not have male threads 8 formed on it. Therefore, the outer surface of the embedded intermediate portion 7a of the connecting rod 7 has an uneven surface shape 71. The uneven surface shape 71 of the deformed reinforcing bar has a larger protrusion than the uneven surface of the male threads 8. Therefore, the uneven surface shape 71 of the deformed reinforcing bar exhibits higher bond strength compared to the male threads 8.

[0084] Thus, since the adhesion-enhancing portion is formed by the uneven shape 71 of the deformed reinforcing bar formed on the outer surface of the embedded intermediate portion 7a, the connecting rod 7 with the adhesion-enhancing portion can be manufactured using readily available deformed reinforcing bars. Therefore, the manufacturing cost of the connecting rod 7 can be reduced. ≪Ninth Embodiment≫

[0085] A ninth embodiment of the present invention will be described with reference to Figure 13. Figure 13 is a side cross-sectional view of a joint structure in a building according to the ninth embodiment. In this embodiment as well, the configuration of the adhesion force enhancing part provided on the connecting rod 7 differs from that of the first embodiment.

[0086] As shown in Figure 13, the adhesion force enhancing section of this embodiment consists of two nuts 9 that are screwed onto the buried intermediate section 7a of the connecting rod 7, and a bearing plate 81 sandwiched between the two nuts 9. The bearing plate 81 has a through hole in the center, and the connecting rod 7 is inserted through the through hole and then sandwiched between the two nuts 9. These two nuts 9 and the bearing plate 81 are attached to the center of the buried intermediate section 7a.

[0087] In this embodiment, since the adhesion force enhancing section is configured in this way, the adhesion strength of the connecting rod 7 can be easily changed by changing the size of the bearing plate 81.

[0088] This concludes the description of specific embodiments. However, the present invention is not limited to the above embodiments or modifications and can be broadly modified and implemented. In the above embodiments, the present invention is applied to the joint structure of beams 3 in the longitudinal direction, but the present invention may also be applied to the joint structure of beams 3 in the inter-beam direction. In the fourth embodiment shown in Figure 8, two nuts 9 are embedded in the connecting block 5, but they may be placed in a position that abuts the end face of the connecting block 5, as in the sixth embodiment shown in Figure 9. In this case, since the nuts 9 are not embedded in the concrete of the connecting block 5, it is preferable to screw the nuts 9 onto the extended end 7b of the connecting rod 7 after the manufacturing of the connecting block 5. In addition, the specific configuration, arrangement, quantity, material, and manufacturing procedure of each member and part can be changed as appropriate, as long as it does not depart from the spirit of the present invention. Furthermore, each configuration shown in the above embodiments can be combined as appropriate. Moreover, not all of the components shown in the above embodiments are essential and can be selected as appropriate. [Explanation of Symbols]

[0089] 1: Frame 2: Pillar 3:Beam 4:Column body member (frame member) 4a: hole 5: Connection Block 6: Beam member (frame member) 6a: hole 7: Connecting rod 7a: Buried middle part 7b: Extended end 8: Male screw 9: Nut (adhesion-enhancing part) 10: Adhesive 21: Main body components 22: Connection plate 23:Protrusion 24: Insertion hole 25: Through hole 26: Fastening nut 31: Main body components 32: End plate 51: High nut (adhesion-enhancing part) 61: High nut (adhesion-enhancing part) 71: Uneven surface (adhesion-enhancing section) 81: Bearing plate (adhesion-enhancing part)

Claims

1. A joining structure for a pair of structural members arranged in a straight line, A concrete connecting block placed between a pair of the aforementioned structural members, A plurality of metal connecting rods having an embedded intermediate portion embedded in the connecting block so as to penetrate the connecting block, and a pair of extended ends with male threads extending in both directions from the connecting block to connect the structural members, A joining structure comprising: an adhesion force enhancing portion provided on each of the connecting rods to increase the axial adhesion resistance to the connecting block.

2. The joint structure according to claim 1, wherein each of the frame members constitutes the main body of the column, and the connecting block constitutes the joint of the column.

3. The joint structure according to claim 1, wherein each of the frame members constitutes a beam, and the connecting block constitutes the joint portion of the column.

4. The joining structure according to claim 1, wherein each of the frame members is made of wood and is joined to the connecting rod by adhesive.

5. The joining structure according to claim 1, wherein each of the frame members includes a wooden main body member and a metal connecting plate joined to the end grain of the main body member, the connecting plate having a plurality of through holes through which the extended end of the connecting rod is inserted, and is joined to the connecting block by a plurality of nuts that are screwed onto the extended end.

6. The joining structure according to claim 1, wherein each of the frame members includes a main body member made of steel and an end plate joined to the end face of the main body member, the end plate having a plurality of through holes through which the extended end of the connecting rod is inserted, and is joined to the connecting block by a plurality of nuts that are screwed onto the extended end.

7. The joining structure according to claim 1, wherein the buried intermediate portion of the connecting rod is provided with a male thread, and each of the adhesion force enhancing portions includes a nut that is screwed onto the buried intermediate portion.

8. The joining structure according to claim 7, wherein each of the adhesion-enhancing parts includes a double nut composed of two nuts (9, 9) that are in contact with each other.

9. The joining structure according to claim 1, wherein each of the adhesion-enhancing portions includes a pair of high nuts that abut against opposing surfaces of the connecting block, and the extended ends are connected to the embedded intermediate portion via the corresponding high nuts.

10. The joining structure according to claim 1, wherein each of the adhesion-enhancing portions includes a pair of high nuts embedded in opposite faces of the connecting block, and the extended end is connected to the embedded intermediate portion via the corresponding high nut.

11. The joint structure according to claim 1, wherein the buried intermediate portion of the connecting rod is made of deformed reinforcing bars, and each of the adhesion-enhancing portions is composed of the uneven shape of the deformed reinforcing bars formed on the outer surface of the buried intermediate portion.

12. The joint structure according to claim 1, wherein the buried intermediate portion of the connecting rod is provided with a male thread, and each of the adhesion force enhancing portions includes a plurality of nuts that are screwed onto the buried intermediate portion and a bearing plate sandwiched between the nuts.

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