Joints and joining methods for components

Abstract

To provide means for improving workability including relative positioning when joining mounting object members to each other by a simple structure.SOLUTION: In a joint having a pair of fitted parts respectively provided in a pair of opposing mounting object members, a pair of engaging parts fitted in the fitted part, and a connecting member provided with a bridging part connecting the pair of engaging parts, the opening edge part of the fitted part has an installing part capable of installing a lid member, and the lid member closes the opening of the fitted section by installing it in the installing part.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a joint or the like for joining a plurality of members. [Background technology]

[0002] Conventionally, buildings, structures, furniture, etc., including buildings and residential houses, bridges, segments, structures such as precast products, etc., are constructed by joining components together. As a method for joining components together, for example, a method for joining precast deck slabs of a bridge, a method using loop reinforcing bars (see, for example, Patent Document 1) is known. Another known method of joining deck slabs is to provide a convex or concave portion on the surface where the deck slabs are joined, and position the convex portion of one deck slab within the concave portion of the other deck slab (see, for example, Patent Document 2). Also, as a method for joining other members together, a so-called cotter joint is known in which a C-type joint protrudes from each side surface of a pair of members and the fitting portion of an H-type joint is positioned within the fitting recess of the C-type joint (see, for example, Patent Document 3). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-303538 [Patent Document 2] Patent No. 5879452 [Patent Document 3] Patent No. 5787965 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the method described in Patent Document 1 requires on-site bending of the rebar, inserting a wire through the loop of the rebar, and then pouring concrete, which means that the installation of the precast deck requires a long time. Furthermore, because the inner bending radius of the loop shape of the rebar is determined to a certain extent, the thickness of the precast deck cannot be made thin, making it impossible to apply to a specified planned height. Furthermore, the increased weight of the precast deck increases reaction forces and stresses, which are structurally disadvantageous to the substructure, etc.

[0005] Furthermore, in the method described in Patent Document 2, the components are attached to each other via filler, but no steel rods or prestress are introduced to apply stress to the deck slab in the bridge axis direction, which means that gaps may appear between the deck slabs due to expansion and contraction of the deck slabs caused by temperature changes, or the deck slabs may shift in position in a direction perpendicular to the bridge axis, making it impossible to maintain the joined state.

[0006] Furthermore, in the method described in Patent Document 3, when a pair of components are positioned in a predetermined position, the fitting portion of the H-type joint fitting can be fitted into the fitting recess of each C-type joint fitting, and only then can the C-type joint fitting and the H-type joint fitting be secured with bolts. Therefore, if the components are out of position, there is a problem in that the fitting portion of the H-type joint fitting cannot be fitted into the fitting recess of both C-type joint fittings and secured with bolts. Furthermore, with the cotter joint described in Patent Document 3, the components cannot be positioned relative to each other by fitting the H-type joint fitting into the C-type joint fitting. Therefore, when joining components, it is necessary to position the components relative to each other without error. Furthermore, when the components are precast decks used in bridges, it is very difficult to adjust the position of multiple chain hoists on the precast deck, such as aligning them in the direction along the bridge axis, in the direction perpendicular to the bridge axis, and in the vertical direction, or correcting the inclination relative to the bridge surface. This results in a problem of long work time and significantly reduced workability. Furthermore, if the fastening force of the bolts fastening the two mating portions of the H-type joint fitting and the C-type joint fitting is used to position the components—i.e., if the components are slightly misaligned and the mating portions of the H-type joint fitting are partially inserted into the mating recesses of the C-type joint fitting, and then the bolts are forcibly tightened to fit the mating portions into the mating recesses of the C-type joint fitting, the bolts cannot be accurately tightened. It is extremely difficult to simultaneously tighten each bolt at the same speed (or torque), so in practice, each bolt is tightened gradually, one side at a time. However, this task is not easy, and the operator's sense and skill play a significant role, resulting in variations in the fastening state depending on the operator. Specifically, if the bolts are tightened one side at a time, the tightened side of the H-type joint fitting will sink, while the opposite side will appear to be relatively raised, resulting in a tilted position. As a result, the H-joint fitting may end up being fixed in a different position and at an angle than it should be in. This not only causes abnormalities in the fastening force, but also reduces fatigue strength and can cause unintended problems with joint compression force.As can be seen from this, it is desirable that H-joint fittings are always installed and fixed in a horizontal position without tilting.

[0007] The present invention was made through intensive research by the inventor in consideration of the above problems, and aims to provide a means for improving workability, including relative positioning, when joining attachment target components using a simple structure. [Means for solving the problem]

[0008] The joint of one aspect of the present invention is provided on a pair of opposing attachment target members. , has a recessed accommodating portion a pair of insertion portions, Storage section a connecting member having a pair of engaging portions that can be fitted into the connecting member, and a bridge portion that connects the pair of engaging portions; Storage section an installation portion that configures an opening edge portion of the a female thread region provided on a circular inner periphery formed at an open end of the installation portion; Above installation section The above female thread area to conclusion And and a protrusion protruding from the male thread region, and when closing the opening of the accommodating portion, the male thread region is fastened to the female thread region, thereby controlling the pressing force applied to the engaging portion fitted into the fitted portion against which the protrusion abuts and presses.and a cover member.

[0010] The joint of the present invention further comprises: but The opening is wider than the inner peripheral surface of the opening edge portion. attitude It is characterized by the following.

[0011] In the joint of the present invention, the inserted portion has an inner circumferential surface that narrows from an opening edge on one end side to the other end side.

[0012] The joint of the present invention is also characterized in that the connecting member has a shaft portion that is inserted into the bridging portion along the fitting direction of the engaging portion, and an abutment portion that is arranged at one end of the shaft portion.

[0013] The joint of the present invention is characterized by having a fixing portion that fixes the engaging portion and the inserted portion together.

[0014] Furthermore, the joint of the present invention is characterized in that the fixing portion is a male-threaded body, the engaging portion has a hole through which the male-threaded body is inserted, and the inserted portion has a female-threaded hole that can be threaded onto the male-threaded body.

[0015] The joint of the present invention is characterized in that the shaft portion is configured to break when a torque and / or axial force equal to or greater than a predetermined value is applied.

[0016] The method of joining members of the present invention is characterized in that the members to be attached are joined together using the joint of the present invention. [Effects of the Invention]

[0022] According to the present invention, the simple structure can improve the workability, including the relative positioning when joining attachment target members together. [Brief explanation of the drawings]

[0023] [Figure 1] FIG. 1 is a plan view showing a precast deck to which a joint according to a first embodiment is applied. [Figure 2] FIG. 1 is a cross-sectional view of a precast deck to which a joint according to a first embodiment is applied. [Figure 3] 1A to 1C show a receiving member of a joint according to a first embodiment, in which (a) is a perspective view, (b) is a cross-sectional view seen from the left side, and (c) is a cross-sectional view seen from the front. [Figure 4] FIG. 2 is a perspective view showing a connecting member of the joint according to the first embodiment. [Figure 5] 10A to 10C are diagrams showing a procedure for connecting the receiving members to each other with the connecting member. [Figure 6] 10A and 10B are diagrams showing the positioning process of a precast deck to which a joint according to the first embodiment is applied. [Figure 7] FIG. 10 is a diagram showing the positioning of precast deck slabs spaced apart from each other. [Figure 8] This is a diagram showing positioning when the precast deck is misaligned in the Y direction. [Figure 9] 10 is a cross-sectional view showing a state in which an engaging portion abuts against one inner circumferential surface in the Y direction. FIG. [Figure 10] 10A and 10B are diagrams illustrating an example of an anti-rotation mechanism between a shaft portion and a bridge portion. [Figure 11] 10A and 10B are diagrams showing other shapes of the inner circumferential surface of the accommodating portion and the outer circumferential surface of the engaging portion. [Figure 12] 10A and 10B are diagrams illustrating examples of inclination of the inner circumferential surface of the storage portion. [Figure 13] 10A and 10B show a joint according to a second embodiment, in which FIG. 10A is a perspective view and FIG. [Figure 14] FIG. 10 is a perspective view showing a receiving member of a joint according to a second embodiment. [Figure 15] 10A and 10B are diagrams illustrating examples of shapes of concave-convex engaging portions. [Figure 16] FIG. 10 is a cross-sectional view showing the configuration of another connecting member. [Figure 17] FIG. 10 is a plan view showing the appearance of another connecting member. [Figure 18] FIG. 10 is a plan view showing the appearance of another connecting member. [Figure 19] FIG. 10 is a plan view showing the appearance of another connecting member. [Figure 20]1A and 1B are diagrams showing a provisionally assembled state and a final assembled state of a joint; [Figure 21] 10A and 10B are diagrams showing a procedure for applying prestress by rearranging connecting members. [Figure 22] FIG. 10 is a cross-sectional view showing the configuration of another joint. [Figure 23] FIG. 10 is a plan view showing another example of the arrangement of precast floor slabs. [Figure 24] FIG. 10 is a plan view showing another receiving member. [Figure 25] FIG. 10 is a view showing a receiving member made up of a plurality of sections. [Figure 26] FIG. 10 is a view showing a receiving member made up of a plurality of sections. [Figure 27] FIG. 10 is a view showing a receiving member made up of a plurality of sections. [Figure 28] 10A and 10B are diagrams showing examples of anchor arrangement grooves in a receiving member. [Figure 29] FIG. 10 is a view showing a joint provided with a cover member. [Figure 30] 10A and 10B are diagrams illustrating an example of a method for fixing the cover member. [Figure 31] FIG. 10 is a perspective view showing the configuration of another joint. [Figure 32] 1A and 1B show a connecting member, in which FIG. 1A is a perspective view and FIG. 1B is a side view. [Figure 33] FIG. [Figure 34] 10 is a diagram showing the orientation of the connecting member when the receiving member is shifted in the Y direction. FIG. [Figure 35] 10A and 10B are diagrams showing other configurations of the joint. [Figure 36] 10A and 10B are diagrams showing the connection of receiving members of different heights. [Figure 37] 10A and 10B are diagrams showing other configurations of the joint. [Figure 38] 10A and 10B are diagrams showing other configurations of the joint. [Figure 39] 10A and 10B are diagrams showing other configurations of the joint. DETAILED DESCRIPTION OF THE INVENTION

[0024] An embodiment of the joint of the present invention will be described below with reference to the drawings. The joint of the present invention can be used to connect or join various attachment target members, but here we will explain the application to precast decks used in decks such as bridges, roads, and railway rail bases.

[0025] FIG. 1 is a plan view showing a precast slab 1 to which a joint 10 according to a first embodiment is applied, and FIG. 2 is a cross-sectional view of the precast slab 1 to which the joint 10 according to the first embodiment is applied, taken along line AA in FIG. 1. The precast slab 1 is spanned and fixed on multiple main girders (not shown) arranged side by side in the bridge width direction (Y direction). The precast slabs 1 are also arranged adjacent to each other along the bridge axis direction (X direction), which is the direction in which the members are connected, and opposing precast slabs 1, 1 are connected by joints 10. After the precast slabs 1, 1 are connected by joints 10, a hardening fluid such as grout, ready-mixed concrete, water glass, or a thermosetting or thermoplastic synthetic resin in a fluid state can be injected between the precast slabs 1 to seal the joints.

[0026] The joint 10 has a connecting member 20 and receiving members 30, 30a, and is configured by connecting the receiving members 30, 30a to each other via the connecting member 20. Figure 3 is a perspective view showing the connecting member 20 of the joint 10 according to the first embodiment. The connecting member 20 has a generally H-shaped cross section and has a pair of engaging portions 22, a bridging portion 24 connecting the pair of engaging portions 22, a shaft portion 26 inserted into the bridging portion 24, and a pressing body (abutment body) 28 supported on the shaft portion 26 so as to be able to rotate integrally with it.

[0027] The engaging portion 22 is a member extending in a direction perpendicular to the XY plane, has a tapered outer peripheral surface, and forms a generally quadrangular pyramid shape that gradually narrows from the base end (upper end) side fixed to the bridging portion 24 to the tip end (lower end). That is, of the outer peripheral surfaces of the engaging portion 22, the outer peripheral surface facing in the X direction is inclined generally symmetrically so that the spacing in the X direction narrows from the upper end to the lower end, and the outer peripheral surface facing in the Y direction is inclined generally symmetrically so that the spacing in the Y direction narrows from the upper end to the lower end.

[0028] The bridging portion 24 is formed with a narrow shape and a shorter length in the Y direction than the engaging portion 22. The bridging portion 24 has an insertion hole at the center of the XY plane that extends in a direction perpendicular to the XY plane, and the shank 26 is inserted into the insertion hole. The shank 26 has an externally threaded portion 26a with a right-handed external helical groove at one end. The shank 26 also has a head 26b at the other end that has an outer periphery larger than the insertion hole of the bridging portion 24 and has a hexagonal hole formed in its top surface. The head 26b has a seat that can come into contact with the bridging portion 24.

[0029] The pressing body 28 has a generally rectangular shape in plan view, with a short side portion 28a and a long side portion 28b, and has a female screw hole that can be screwed onto the male screw portion 26a.

[0030] The short side portion 28a is set to a length that does not interfere with the receiving members 30, 30a when the connecting member 20 is disposed between the receiving members 30, 30a. In other words, the short side portion 28a is set to a length that is shorter than the distance between the receiving members 30, 30a.

[0031] The long side portion 28b is set to a length that interferes with the receiver members 30, 30a when the connecting member 20 is disposed between the receiver members 30, 30a. In other words, the long side portion 28b is set to a length that exceeds the distance between the receiver members 30, 30a.

[0032] 4 shows the receiving members 30, 30a of the joint 10 according to the first embodiment, where (a) is a perspective view, (b) is a cross-sectional view seen from the left side when the end face side of the precast floor slab 1 is the front side, and (c) is a cross-sectional view seen from the front side. The receiving members (inserted portions) 30, 30a are C-shaped joint fittings of the same shape, and are respectively disposed at the ends of a pair of opposing precast floor slabs 1, 1. A portion of the receiving members 30, 30a is embedded in the end of each precast floor slab 1, 1 extending along the Y direction. Therefore, the precast floor slabs 1, 1 are arranged so that the receiving members 30, 30a face each other along the X direction. Although the receiving members 30 and 30a are each considered to be C-shaped joint fittings, they may be made of any material that has the strength required for a joint, and are not limited to metal.

[0033] The receiving members 30, 30a have an anchor portion 32 extending in the X direction within the precast deck 1, a concave accommodating portion 34 into which the engaging portion 22 of the connecting member 20 can be fitted, a restricting portion 36 into which the long side portion 28b of the pressing body 28 can abut, and a step portion 38 facing the restricting portion 36 in the Y direction.

[0034] The receiving members 30, 30a are disposed on the precast deck 1 with the opening edge of the storage section 34 facing upward and along the XY plane. Note that the opening edge of the storage section 34 is not necessarily limited to being disposed facing upward, and the orientation can be set as appropriate, such as facing downward. In addition, the receiving members 30, 30a may be arranged so that the storage section 34 protrudes from the end of the precast deck 1, or part of the storage section 34 may be embedded within the precast deck 1, and the arrangement method can be set as appropriate.

[0035] The accommodation portion 34 has a notch at the end opposite the anchor portion 32 in the X direction into which the bridging portion 24 can be fitted, and has a lip portion 34a along the edge of the notch. The lip portion 34a engages with the engagement portion 22 in the X direction.

[0036] The inner peripheral shape of the accommodation portion 34 corresponds substantially to the outer shape of the engagement portion 22, and is a substantially quadrangular pyramid shape that gradually narrows from the opening edge to the bottom. That is, as shown in Fig. 4(b), of the inner peripheral surfaces of the accommodation portion 34, inner peripheral surfaces 40a and 40b facing in the X direction are inclined substantially symmetrically from the opening edge to the bottom toward the center in the X direction. Also, as shown in Fig. 4(c), inner peripheral surfaces 40c and 40d facing in the Y direction are inclined substantially symmetrically from the opening edge to the bottom toward the center in the Y direction.

[0037] The restricting portion 36 is formed at a position substantially directly below the accommodation portion 34 where it can come into contact with the long side portion 28b of the pressing body 28. That is, it extends in the perpendicular direction from the lower end surface 34b of the accommodation portion 34, and when the lip portion 34a side of the accommodation portion 34 shown in FIG. 4(a) is the front side, the restricting portion 36 is formed on the lower right side of the accommodation portion 34. The space defined by the lower end surface 34b and the restricting portion 36 functions as a space where the long side portion 28b of the pressing body 28 can enter and come into contact with the restricting portion 36.

[0038] Next, we will explain the procedure for connecting the support members 30, 30a with the connecting members 20 and connecting the precast floor slabs 1. The precast floor slabs 1 are arranged so that the ends where the support members 30, 30a are arranged face to face. The support members 30, 30a are also arranged at a predetermined distance so that their lip portions 34a face each other.

[0039] The connecting member 20 has each engagement portion 22 fitted into each accommodation portion 34 in a direction perpendicular to the XY plane, i.e., in the direction indicated by arrow A in Figure 5(a). As a result, the engagement portion 22 fits into the inner circumferential surface of each accommodation portion 34, and the connecting member 20 is disposed between the receiving members 30, 30a. Here, the pressing body 28 is positioned such that the short side portion 28a is oriented parallel to the X direction and on the tip side of the shaft portion 26 so as not to interfere with the receiving members 30, 30a.

[0040] When the engaging portion 22 is fitted into the accommodation portion 34, the pressing body 28 is disposed between the receiving members 30, 30a so as to be able to enter the space defined by the lower end surface 34b of the accommodation portion 34 and the restricting portion 36. Therefore, when the shaft portion 26 is rotated approximately 90°, the pressing body 28 is positioned between the receiving members 30, 30a so that the long side portion 28b can come into contact with the restricting portion 36.

[0041] 5(b), when torque is applied in the fastening direction to the hexagonal hole of the head 26b using a tool such as a wrench, the pressing body 28 threaded onto the shaft 26 rotates together with the shaft 26. When the pressing body 28 rotates approximately 90° (a predetermined angle) and the long side portions 28b become parallel to the X direction, the long side portions 28b come into contact with the restricting portions 36 of the receiving members 30, 30a, and further rotation is restricted. After rotating together with the shaft 26 through the predetermined angle, the pressing body 28 engages with the restricting portions 36 in the circumferential direction, restricting rotation.

[0042] Furthermore, when torque is applied in the tightening direction, the shaft portion 26 rotates relative to the pressing body 28. As a result, the pressing body 28 rises (displaces) along the axial direction to a position where it abuts against the lower end surface 34b. That is, as the shaft portion 26 rotates, the pressing body 28, while abutting against the restricting portion 36, moves along the axial direction toward the receiving members 30, 30a and the bridge portion 24, and abuts against the lower end surface 34b.

[0043] When the pressing body 28 abuts against the lower end surface 34b as shown in Figure 5(c) and cannot rise, rotation of the shaft 26 in the fastening direction is restricted and fastening is completed. As a result, the receiving members 30, 30a are connected by the connecting member 20, and the precast deck 1 is connected.

[0044] Next, we will explain the positioning function of the precast deck 1 based on the shapes of the storage portion 34 and the engaging portion 22. The joint 10 has a positioning function that moves the precast deck 1 by fitting the engaging portion 22 into the storage portion 34. Specifically, the engaging portion 22 and the storage portion 34 abut on their inclined surfaces, and the outer peripheral surface of the engaging portion 22 presses against the inner peripheral surface of the storage portion 34, thereby moving the precast deck 1.

[0045] When connecting precast decks 1, 1, one precast deck 1 is fixed in a predetermined position and the other precast deck 1 is moved to position them so that their relative positions fall within a predetermined range (predetermined position). Here, the precast deck 1 with the support member 30a is fixed, and the precast deck 1 with the support member 30 is moved.

[0046] When the relative positions of the precast deck slabs 1, 1 are spaced apart in the X direction by more than a predetermined distance, placing the connecting member 20 between the receiving members 30, 30a causes the engaging portion 22 to be locked at a midpoint within the storage portion 34, as shown in Figure 6(a). That is, one inner peripheral surface 40a of the storage portion 34 and the outer peripheral surface of the engaging portion 22 are both inclined, and the tip of the outer peripheral surface of the engaging portion 22 abuts against the inner peripheral surface 40a at a midpoint, restricting insertion into the bottom side of the storage portion 34.

[0047] When the head 26b is rotated in the fastening direction, the pressing body 28 gradually moves as described above and is displaced to a position where it abuts against the lower end surface 34b. Then, as shown in Fig. 6(b), the receiving member 30 and the connecting member 20 are sandwiched and pressed between the head 26b and the pressing body 28. Therefore, when the shaft 26 is further rotated in the fastening direction, the position of the pressing body 28 is restricted by the lower end surface 34b, and the head 26b presses the connecting member 20 toward the pressing body 28.

[0048] Since the outer peripheral surface and inner peripheral surface 40a of the engaging portion 22 are in contact with each other at inclined surfaces, the pressing force with which the head 26b presses the connecting member 20 is transmitted to the inner peripheral surface 40a via the outer peripheral surface of the engaging portion 22 and converted into a force that presses the receiving member 30 in the X direction. Therefore, the receiving member 30 moves in the X direction together with the precast deck 1 toward the receiving member 30a, and as a result of this movement, the engaging portion 22 enters the storage portion 34.

[0049] As described above, the receiving member 30 and the precast deck 1 on which the receiving member 30 is arranged gradually move along the X direction toward the receiving member 30a (the other precast deck 1), and when the engaging portion 22 is inserted into the innermost portion of the storage portion 34, the relative position of the receiving member 30 to the receiving member 30a becomes a predetermined position, thereby positioning the precast decks 1, 1.

[0050] By rotating the shaft portion 26 in the fastening direction in this manner and fitting each engagement portion 22 of the connecting member 20 into each storage portion 34 of the receiving members 30, 30a, the engagement portion 22 presses against the inner surface of the storage portion 34, and the relative positions of the precast deck slabs 1, 1 can be positioned in a predetermined arrangement.

[0051] While the example described above is one in which precast floor slabs 1, 1 whose relative positions are spaced apart or displaced in the X direction by more than a predetermined distance are positioned and fixed in a predetermined arrangement, a precast floor slab 1 whose relative positions are closer to each other in the X direction than a predetermined position can also be moved to a predetermined position in the same way. That is, when the tip end of the engaging portion 22 abuts at a midpoint on the other inner peripheral surface 40b of the accommodating portion 34 as shown in Figure 7(a), rotating the head portion 26b in the fastening direction will cause the pressing body 28 to abut against the lower end surface 34b as shown in Figure 7(b), and the receiving member 30 and the connecting member 20 will be sandwiched between the head portion 26b and the pressing body 28.

[0052] As a result, the receiving member 30 is pressed in the X direction via its inner peripheral surface 40b, which is in contact with the outer peripheral surface of the connecting member 20, in a direction away from the other precast floor slab 1, and the precast floor slab 1 and receiving member 30 move in the X direction in a direction away from the receiving member 30a. In addition, as the receiving member 30 moves, the engaging portion 22 enters the accommodating portion 34, and when the receiving member 30 moves to a predetermined position relative to the receiving member 30a, the engaging portion 22 fits into the accommodating portion 34, and the relative positions of the precast floor slabs 1, 1 are positioned in a predetermined arrangement.

[0053] 8(a), when the precast decks 1, 1 are offset from each other in the Y direction, placing the connecting member 20 between the receiving members 30, 30a causes the tip of the engaging portion 22 to abut against the inner circumferential surface 40c of the storage portion 34 and lock at an intermediate position. In other words, the tip of the engaging portion 22 abuts against the inner circumferential surface 40c at an intermediate position, restricting insertion of the engaging portion 22 into the bottom side of the storage portion 34.

[0054] 9 is a cross-sectional view taken along a direction perpendicular to the XY plane, showing the state in which the engaging portion 22 abuts against the inner peripheral surface 40c. When the engaging portion 22 abuts against the inner peripheral surface 40c at a midpoint and the head portion 26b rotates in the fastening direction, the pressing body 28 moves to a position where it abuts against the lower end surface 34b, as described above. The receiving member 30 and the connecting member 20 are then sandwiched and pressed between the head portion 26b and the pressing body 28.

[0055] In addition, since the outer peripheral surface and the inner peripheral surface 40c of the engagement portion 22 are inclined relative to each other, part of the pressing force applied to the receiving member 30 acts as a force in the Y direction via the inner peripheral surface 40c, and therefore the receiving member 30 is pressed in the Y direction.

[0056] Therefore, each time the shaft portion 26 is rotated in the fastening direction, the precast deck 1 and the receiving member 30 gradually move in the Y direction, and as a result, the receiving member 30a is displaced to a predetermined position facing the receiving member 30a in the X direction.

[0057] In this way, even if the precast floor slabs 1, 1 are misaligned in the X and / or Y directions, by connecting the receiving members 30, 30a with the connecting member 20, the precast floor slab 1 can be moved in the X and / or Y directions together with the receiving member 30 and positioned to a predetermined position. That is, the inner circumferential surface of the storage section 34 of the receiving member 30 is pressed by the engaging portion 22, and the precast floor slab 1 can be moved together with the receiving member 30 in the X and / or Y directions toward a predetermined position.

[0058] Furthermore, if the precast decks 1, 1 are misaligned in the height direction perpendicular to the XY directions, the height positions of the precast decks 1, 1 can be aligned by fitting the engagement portions 22 into the accommodation portions 34 of the support members 30, 30a and rotating the shaft portion 26 in the fastening direction. That is, when the shaft portion 26 is rotated in the fastening direction, the axial force acting on the shaft portion 26 is transmitted to the connecting member 20 via the head portion 26b or to the pressing body 28. Then, the connecting member 20 presses the support member 30, or the pressing body 28 presses the lower end surface 34b of the support member 30, and the precast deck 1 moves together with the support member 30 toward the specified height position. This allows the precast decks 1, 1 to be connected by aligning the height positions of the support member 30 and the support member 30a. Of course, if the relative positions of the precast deck slabs 1, 1 are within a specified range, the engagement portion 22 can be inserted almost to the deepest part of the storage portion 34 without performing positioning work by rotating the above-mentioned shaft portion 26, so positioning work is not necessary.

[0059] As explained above, with the joint 10 of this embodiment, even if the relative positions of the precast deck slabs 1, 1 are shifted from the predetermined position far beyond the intersection level (for example, by several tens of mm) in the X direction, Y direction, or direction perpendicular to the XY plane (height direction), the relative positions of the precast deck slabs 1, 1 can be positioned so that they fall within a predetermined range simply by applying a pressing force to the connecting member 20 to enter between the receiving portions 30, 30a so that the engaging portion 22 fits into the accommodating portion 34 of the receiving portions 30, 30a. This makes it easier to perform work including relative positioning when joining the precast deck slabs 1, 1, and also reduces the work time, improving workability. Furthermore, simply by fastening the receiving portions 30, 30a and the connecting member 20 between the head portion 26b and the pressing body 28, the head portion 26b presses the connecting member 20 (or the pressing body 28 presses the receiving portion 30), and the receiving portion 30 can be pressed in the X direction, Y direction and / or height direction. In other words, by simply rotating the shaft portion 26 in the fastening direction so that the receiving portions 30, 30a and the connecting member 20 are fastened between the head portion 26b and the pressing body 28, the relative positions of the precast deck slabs 1, 1 can be positioned to fall within a specified range, and this series of operations can ultimately complete the connection work of the precast deck slabs at the appropriate position, thereby further improving workability.

[0060] Furthermore, since the pair of receiver members 30, 30a and the connecting member 20 are fastened together by a single shaft 26 inserted through the bridging portion 24 and a pressing body 28 disposed on the tip side of the shaft 26, the pair of receiver members 30, 30a and the connecting member 20 can be firmly fixed together. This also strengthens the connection between the pair of receiver members 30, 30a. Therefore, according to the present invention, the workability when connecting the receiver members 30, 30a can be improved.

[0061] Furthermore, simply by rotating the single shaft portion 26 inserted into the center of the bridging portion in the fastening direction, the pair of receiving members 30, 30a and the connecting member 20 are tightened and fixed, and the engaging portion 22 enters and is fixed into the accommodating portion 34 while the connecting member 20 remains horizontal, so the connecting member 20 and the receiving members 30, 30a can be fixed in an extremely stable manner.

[0062] Furthermore, even if the relative positions of the opposing precast deck slabs 1, 1 are misaligned in the direction of the bridge axis or perpendicular to the bridge axis, the precast deck slab 1 and receiving member 30 can be moved to the specified position by fitting them into the engaging portion 22 within the storage portion 34, making positioning easy and further improving workability.

[0063] In addition to the above-described configuration, the shaft portion 26 may be provided with a rotation prevention mechanism to prevent loosening rotation of the shaft portion 26 due to vibration or the like after fastening. Specifically, as shown in FIG. 10 , head-side irregularities 50 are provided on the bearing surface of the head portion 26b, and bridge-side irregularities 52 that can engage with the head-side irregularities 50 are provided on the surface of the bridge portion 24. Furthermore, both irregularities are formed in a sawtooth shape so that they can engage circumferentially. That is, when the shaft portion 26 attempts to rotate in the fastening direction, the inclined surfaces 50a and 52a of the head-side irregularities 50 come into contact, increasing the distance between them in the axial direction and allowing relative sliding. On the other hand, when the shaft portion 26 attempts to rotate in the loosening direction, the perpendicular surfaces 50b and 52b (the surfaces with the steeper inclination) come into contact with each other, preventing rotation of the shaft portion 26. Of course, the bridge portion irregularities 52 on the bridge portion 24 side corresponding to the head side irregularities 50 provided on the seating surface of the head portion 26b may be configured as a washer-like member separate from the bridge portion 24.

[0064] By forming such a rotation prevention mechanism, it is possible to prevent the shaft portion 26 from rotating in the loosening direction due to repeated vibrations, and it is also possible to prevent the pressing body 28 from coming off and falling off due to the shaft portion 26 rotating in the loosening direction.

[0065] Although the internal space of the accommodation portion 34 and the shape of the engagement portion 22 have been described as being generally quadrangular pyramid-shaped, the present invention is not limited to this. For example, the general shape of the engagement portion 22 may be a generally polygonal pyramid shape such as a generally triangular pyramid, a generally pentagonal pyramid, or a generally hexagonal pyramid, or a generally conical shape as shown in FIG. 11. Similarly, the internal space of the accommodating portion 34 may be in a substantially polygonal pyramidal shape such as a substantially triangular pyramidal shape, a substantially pentagonal pyramidal shape, or a substantially hexagonal pyramidal shape, or may be in a substantially conical shape corresponding to the conical shape of the engaging portion 22 as shown in FIG.

[0066] Furthermore, the inner peripheral surface of the accommodating portion 34 and the outer peripheral surface of the engaging portion 22 have been described as being symmetrically inclined with respect to each other in the X direction or the Y direction, but of course this is not limited to this and they may be asymmetrically inclined, or one of the opposing surfaces may be inclined and the other may not be inclined.

[0067] For example, of the inner circumferential surfaces 40a, 40b of the accommodation portion 34, one inner circumferential surface 40a may not be inclined, and only the other inner circumferential surface 40b may be inclined, as shown in Figure 12(a). Also, only one inner circumferential surface 40a may be inclined, as shown in Figure 12(b), or the inner circumferential surfaces 40a, 40b may be inclined in the same direction but with different inclination angles, as shown in Figure 12(c) or 12(d). Of course, the inclination of the outer circumferential surface of the engagement portion 22 may be set in a similar manner to that described above.

[0068] Furthermore, head 26b has a shape with a hexagonal hole on the top surface, but is not limited to this and may have a cross-shaped hole, a slot, a rectangular hole, a star-shaped hole, etc. Furthermore, instead of providing a hole on the top surface, the outer shape may be an irregular shape such as a substantially square shape or a substantially hexagonal shape.

[0069] Furthermore, the precast floor slabs 1, 1 connected by the joints 10 are not limited to being arranged facing each other at a distance, but may be arranged so that the precast floor slabs 1, 1 are in contact with each other so that there are almost no joints between them. In that case, the length in the X direction may be set so that the receiving member 20 (and / or receiving member 20a) can come into contact with the opposing receiving member 20a (and / or receiving member 20), as shown in Figure 23.

[0070] Next, a joint according to a second embodiment will be described. Figure 13 shows a joint 60 according to the second embodiment, with (a) being a perspective view and (b) being a side view. In the following description, the same components as those of the joint 10 of the first embodiment will be designated by the same reference numerals, and their description will be omitted. Furthermore, the anchor portion 32 is not necessarily required in each figure, and will be omitted here.

[0071] The joint 60 differs from the joint 10 of the first embodiment in that it has a concave-convex engaging portion 62 that directly engages the receiving members 30, 30a in the fitting direction. The concave-convex engaging portion 62 protrudes outward from the lip portion 34a in the X direction, and its end face has a plurality of concaves and convexes arranged in the vertical direction.

[0072] The concave-convex engaging portion 62 has concaves and convexes that mesh with each other when the relative positions of the receiving members 30, 30a are in a predetermined position. That is, as shown in Fig. 14, the concave-convex engaging portion 62 has concaves and convexes 62a formed on the lip portion 34a on one side in the Y direction and concaves and convexes 62b formed on the lip portion 34a on the other side in the Y direction. The concaves and convexes 62a, 62b are formed so that the positions of the convex and concave portions arranged in the fitting direction are staggered so that the convex portions fit into the concave portions of the mating side when arranged opposite each other.

[0073] Similar to the first embodiment described above, the joint 60 is constructed by connecting the receiver members 30, 30a via the connecting member 20. That is, similar to the first embodiment described above, the connecting member 20 is first disposed between the receiver members 30, 30a, and torque is applied to the shaft portion 26 in the fastening direction.

[0074] When the pressing body 28, which is threaded onto the shaft portion 26, rotates together with the shaft portion 26 and the long side portion 28b of the pressing body 28 is oriented parallel to the X direction, it comes into contact with the restricting portion 36 of each receiving member 30, and its rotation is restricted. Then, as the shaft portion 26 rotates in the fastening direction, the pressing body 28 gradually moves toward the head portion 26b and comes into contact with the lower end surfaces 34b of the receiving members 30, 30a.

[0075] As a result, the receiving members 30, 30a are fastened to the connecting member 20. Furthermore, if the relative positions of the precast deck slabs 1, 1 are farther apart than a predetermined position, the engaging portion 22 fits into the accommodating portion 34, allowing the precast deck 1 and receiving member 30 to be moved to the predetermined position and positioned. When the precast deck 1 and receiving member 30 have moved to the predetermined position, the concave and convex engaging portions 62 mesh with each other, and the receiving members 30, 30a engage in the fitting direction.

[0076] In this way, by forming the concave-convex engagement portion 62, the joint strength against external forces in the insertion direction of the precast deck slabs 1, 1, i.e., in a direction perpendicular to the XY plane, is improved, and the strength of the joint 60 itself can be improved.

[0077] The concave-convex shape of the concave-convex engaging portion 62 is not particularly limited, and may be appropriately set, for example, to a substantially triangular shape as shown in Fig. 15(a), a substantially wave shape as shown in Fig. 15(b), a concave-convex shape in which the engaging sides of the concaves and convexities (contact surfaces between the concaves and convexities) are parallel to the X direction as shown in Fig. 15(c), or a sharp-pointed shape in which the contact surfaces between the concaves and convexities are parallel to the X direction from the base end to the middle as shown in Fig. 15(d). However, if the positions of the receiving members 30 are not aligned in the vertical direction, it is preferable to set the opening of the concaves wide and the tip of the convexity to a shape that is tapered so that the convexity can easily enter the concaves.

[0078] Furthermore, in the above-described embodiments, the head 26b of the shank 26 is described as contacting the bridge portion 24. However, this is not limiting. The shank 26 may be oriented so that the head 26b can contact the lower end surface 34b of the accommodation portion 34. That is, the shank 26 may be inserted upside down relative to the bridge portion 24. In this case, the head 26b is formed into a substantially rectangular shape having a short side portion 28a and a long side portion 28b so as to have a shape corresponding to the pressing body 28. In this case, the head 26b contacts the restricting portion 36, restricting rotation in the fastening direction. Furthermore, by threading the pressing body 28 onto the shank 26 on the bridge portion 24 side and rotating the pressing body 28 in the fastening direction, the receiving members 30, 30a and the connecting member 20 can be fastened together. In this case, it goes without saying that a female-threaded body such as a hexagonal nut may be used instead of the pressing body 28.

[0079] Furthermore, when the shank 26 is inserted upside down, the head 26b does not necessarily have to have a shape that contacts the restricting portion 36, as long as it has a shape that allows it to abut against the lower end surface 34b. In this case, for example, a groove or the like that engages with a tool, such as a cross recess or a slot, may be formed in the tip of the shank 26. Then, the female-threaded body that is threaded onto the shank 26 is fixed in a state in which it abuts against the bridging portion 24, and the shank 26 is rotated in the fastening direction using a tool or the like, thereby fastening the receiving members 30, 30a and the connecting member 20 together.

[0080] Furthermore, although the case where the pressing body 28 is screwed onto the male threaded portion 26a of the shaft portion 26 has been described as an example, the present invention is not limited to this, and the shaft portion 26 and the pressing body 28 may be integral with each other. In this case, it is preferable that the pressing body 28 be configured to be rotatable together with the shaft portion 26 by a predetermined angle and to be displaceable in the axial direction.

[0081] For example, as shown in FIG. 16( a), the shaft portion 26 is slidably inserted into the insertion hole of the bridge portion 24, and a biasing member 70 is provided that biases the end face of the head portion 26b so as to move away from the bridge portion 24 in the axial direction. This allows the pressing body 28 to rotate together with the shaft portion 26 at a position where it does not interfere with the step portion 38 and to abut against the connecting member 20. That is, the shaft portion 26 is pressed and slid in a direction against the biasing member 70, and the shaft portion 26 is rotated so that the long side portion 28b is parallel to the X direction. Then, when the pressure on the shaft portion 26 is released and the biasing member 70 biases the shaft portion 26, the pressing body 28 abuts against the lower end surface 34b as shown in FIG. 16( b).

[0082] Furthermore, the connecting member 20 has been described as having one engaging portion 22 on each side in the X direction, i.e., the engaging portions 22 arranged one-to-one with the bridging portion 24 as the boundary, but the number of engaging portions 22 is not limited, and they may be arranged in a one-to-multiple relationship with the bridging portion 24 as the boundary. For example, as shown in Figure 17(a), one engaging portion 22 may be arranged at one end in the X direction and two engaging portions 22 at the other end. Note that the engaging portions 22 may be formed radially from the shaft portion 26 as the center, as shown in Figure 17(b).

[0083] The engaging portions 22 may also be arranged in a multiple-to-multiple configuration with the bridge portion 24 as a boundary. For example, as shown in Figures 18(a) and 18(b), two engaging portions 22 may be arranged at one end in the X direction and two engaging portions 22 at the other end, or as shown in Figure 18(c), three engaging portions 22 may be arranged at one end in the X direction and two engaging portions 22 at the other end.

[0084] Furthermore, the distance from the shaft portion 26 to the engaging portion 22 may be set to be equal on both sides in the X direction, but it goes without saying that it may also be set to be different distances as shown in FIG.

[0085] Furthermore, in the above embodiment, the engaging portion 22 is described as being in close contact with the inner periphery of the accommodating portion 34, but the inner periphery space of the accommodating portion 34 may be set larger than the engaging portion 22, as long as the engaging portion 22 can at least engage within the accommodating portion 34. In this way, a gap is created between the inner periphery surfaces 40a to 40d of the accommodating portion 34 and the engaging portion 22, so that the relative positions of the receiving member and the attachment target members can be positioned within a predetermined range.

[0086] Furthermore, during the positioning process, the distance between the receiving members 30, 30a is determined by the position of the engaging portion 22 entering the receiving portion 34. This can be used to apply a pressure force, which can be called post-stress rather than pre-stress, to the hardening fluid injected between the precast floor slabs 1, 1. Specifically, the pre-assembled state is a state in which the precast floor slabs 1, 1 are spaced apart from each other by a predetermined distance and the engaging portion 22 of the connecting member 20 is not inserted all the way into the receiving portion 34. The final assembled state is a state in which the engaging portion 22 of the connecting member 20 is inserted all the way into the receiving portion 34. The hardening fluid is injected between the precast floor slabs 1, 1 in the pre-assembled state. After the hardening reaches a certain hardness, the final assembled state is established. As shown in FIG. 20, the engaging portion 22 of the connecting member 20 presses against the inner peripheral surface 40a of the connecting member 20, applying a compressive pressure to the hardening fluid between the precast floor slabs 1, 1. Of course, it goes without saying that the precast deck slabs 1, 1 may be brought closer to each other than the predetermined position to be in a provisionally assembled state.

[0087] Furthermore, in the present invention, the distance between the receiving members 30, 30a is determined according to the length of the bridging portion in the X direction, and therefore, by replacing multiple connecting members with different bridging portion lengths, it is possible to apply prestress to the hardening fluid injected into the gap (joint clearance) between the connected precast deck slabs 1, 1.

[0088] Specifically, a short connecting member (referred to as a short connecting member 82) and a long connecting member for main assembly (referred to as a long connecting member 82) are used. Here, the long connecting member 82 has a long bridging portion 82a that is longer in the X direction than the short bridging portion 80a of the short connecting member 80. Furthermore, the length of the long bridging portion 82a in the X direction is set so that it is longer than the short bridging portion 80a by the amount of elongation in the X direction that the short bridging portion 80a can extend in the elastic deformation range.

[0089] The precast slabs 1, 1 are connected to each other by multiple joints 10. Figure 21 shows the procedure for applying prestress by rearranging the connecting members, and the precast slabs 1, 1 shown in Figure 21(a) are connected by three joints 10. That is, each precast slab 1 has three support members 30 (or support members 30a) arranged in parallel at approximately equal intervals along the Y direction. The precast slabs 1, 1 are positioned by connecting the support members 30, 30a using short connecting members 82.

[0090] Next, of the multiple joints 10, the short connecting members 82 are removed from the joints 10 located at both ends in the Y direction, and replaced with long connecting members 80. Therefore, the short connecting member 82 of the joint 10 located at the middle position in the Y direction shown in Figure 21(b) is subjected to a tensile force in the X direction and is stretched in the elastic deformation range, and this is the temporarily assembled state.

[0091] In this temporary assembled state, a hardening fluid is injected into the gap between the precast deck slabs 1, 1. In order to prevent the hardening fluid from adhering to the long connecting members 80, an anti-adhesion member such as a covering cover or plate material may be placed around the long connecting members 80 in advance.

[0092] After the hardening fluid hardens to a certain hardness or higher and becomes a hardened body, the long connecting members 80 are removed from the joints 10 at both ends shown in Figure 21(c) and replaced with short connecting members 82 for final assembly. As a result, inside the hardened body, a force acts on the short connecting members 82, which were previously stretched when they were replaced, as they try to return to their original length, applying a compressive force to the hardened body and prestressing it, thereby reinforcing the hardened body.

[0093] After applying prestress, the short connecting members 82 may be left exposed, or a hardening fluid may be injected to seal the joints between the precast floor slabs 1, 1 so that they are flush with the precast floor slabs 1, 1. The number of joints 10 for connecting the precast floor slabs 1, 1 is not particularly limited, and they may be connected with two joints 10, or with four or more joints. The short connecting members 82 may be used for temporary assembly, and the long connecting members 80 may be used for actual assembly.

[0094] The precast deck slabs 1, 1 may also be connected using multiple joints 10 and cotter joints of other structures. As long as the precast deck slabs 1, 1 can be positioned relative to each other at least using the joints 10, the number and arrangement of the joints 10 and cotter joints may be set as appropriate. For example, the joints 10 and cotter joints may be arranged alternately, the joints 10 may be positioned at both ends of the precast deck slab 1 in the Y direction with cotter joints arranged between the joints 10, or the joints 10 may be positioned in the center with cotter joints arranged on both sides.

[0095] Furthermore, in each of the above-described embodiments, the connecting member 20 is pressed by the axial force generated by rotating the shaft portion 26 in the fastening direction so that the engaging portion 22 fits into the accommodating portion 34. However, it is of course also possible to omit the shaft portion 26 from the connecting member 20 and make it possible to directly press the connecting member 20 with a tool such as a hammer.

[0096] Furthermore, in each of the above-described embodiments, the insertion hole formed in the bridging portion 24 is not limited to a through hole, as long as the shank 26 can be inserted therethrough. For example, as shown in FIG. 22( a), a blind insertion hole 86 may be drilled in the lower end surface of the bridging portion 24. In this case, a male threaded pin 88 serving as a shank is inserted into the insertion hole 86 from below the bridging portion 24 and fixed. Specifically, a female threaded helical groove is formed on the inner peripheral surface of the insertion hole 86, and the male threaded pin 88 is further provided with a male threaded portion 88a having a male threaded helical groove that threads into the female threaded helical groove, and a head portion 88b provided at the base end of the male threaded portion 88a. Then, as shown in FIG. 22( b), the male threaded pin 88 is threaded into the insertion hole 86, and the head portion 88b is brought into abutment against the lower end surface 34b to fasten the connecting member 20 and the receiving members 30, 30a together to form a joint.

[0097] Furthermore, the shape of the support members 30, 30a is not particularly limited. For example, as shown in FIG. 24, the outer shape in a plan view may be substantially wedge-shaped. That is, the width a1 at one end in the X direction where the lip portion 34a and the inner peripheral surface 40a are provided in the X direction may be narrower than the width a2 at the other end in the X direction (toward the inner peripheral surface 40b). By using such a wedge-shaped support member 30, 30a, the tensile resistance to tension in the X direction between the support member 30, 30a and the precast floor slab is improved within the precast floor slab. Therefore, the support member 30, 30a and the precast floor slab are more firmly fixed together.

[0098] The anchor portions 32 provided on the receiving members 30, 30a may be integral with the receiving members 30, 30a or may be separate. The shape of the separate anchor portions 32 is not particularly limited, and the material and shape may be appropriately set, such as deformed steel bars, threaded reinforcing bars, round bars, U-shaped reinforcing bars, or plates. Of course, even when the anchor portion 32 is an integral unit, its shape is not particularly limited.

[0099] When a separate anchor portion 32 is disposed in the receiving member 30, 30a, it is preferable to provide an anchor disposing groove in the receiving member 30, 30a and fit the anchor portion 32 into the groove to secure it. Of course, other fixing means such as welding, adhesion, or bonding may be used between the anchor portion 32 and the receiving member 30, 30a. Alternatively, the anchor portion 32 may be fixed by forming the insertion end of the anchor portion 32 into a male thread and forming the inner peripheral surface of the anchor disposing groove in the receiving member 30, 30a into a female thread, thereby screwing the anchor portion 32 into the receiving member 30, 30a.

[0100] Furthermore, the base members 30, 30a may be formed from a plurality of separate sections, with the anchor portion 32 sandwiched between the sections and fixed. For example, as shown in Figure 25, the base member 30 may be formed from two separate sections 100, 102. While the base member 30 will be described here, it goes without saying that the base member 30a may be similarly configured. The base member 30 has an anchor placement groove 104 in the center of the surface opposite the lip portion 34a in the X direction.

[0101] The partial bodies 100, 102 each have a coupling surface 106 that is perpendicular to the XY plane and parallel to the X direction, and are coupled to each other using the coupling surfaces 106 as mating surfaces. Furthermore, the partial bodies 100, 102 each have an inner peripheral surface of a recess and / or groove that forms the anchor disposing groove 104 formed on the engaging surface 106. Therefore, the anchor disposing groove 104 is formed by coupling multiple partial bodies 100, 102 together.

[0102] The partial bodies 100 and 102 are joined together by bolting. Therefore, the partial bodies 100 and 102 are joined together by connecting through holes (not shown) formed in the partial bodies 100 and 102 in the Y direction, inserting bolts into the connecting through holes, and fastening nuts to the bolts.

[0103] The means for connecting the sections 100 and 102 is not limited to bolt fastening, but may be caulking or rivet fastening. Also, bonding, welding, fitting, or a combination of these may be used as a connecting means. Furthermore, the bonding surface 106 is not limited to being approximately flat, but may have any shape, such as an approximately uneven surface as shown in FIG. 26(a), an approximately mountain-shaped shape in which the unevenness is mountain-shaped as shown in FIG. 26(b), or an approximately wave-shaped shape in which the unevenness is curved as shown in FIG. 26(c).

[0104] When concaves and convexes are formed on the joining surface 106, fitting the concaves and convexes together increases the frictional force and / or fitting force between the joining surfaces 106, thereby preventing the sections 100 and 102 from sliding or shifting in a direction perpendicular to the XY plane. Furthermore, before joining the sections 100 and 102, the concaves and convexes of the joining surfaces 106 can be fitted together, making it easy to align them.

[0105] In addition, the joining surface 106 may be formed with minute irregularities such as knurling or a minutely irregular surface such as a roughened surface, which also increases the frictional force and / or mating force between the joining surfaces 106, thereby preventing the partial bodies 100, 102 from sliding or shifting in a direction perpendicular to the XY plane. Alternatively, one or more recesses may be provided on the joining surface 106 of the partial body 100, and one or more protrusions may be provided on the joining surface 106 of the partial body 102, with the protrusions fitting into the recesses for alignment. Alternatively, the joining surface 106 may have a surface shape in which a portion is flat and the other portion has a slightly uneven surface or an uneven surface as shown in Figures 26(a) to 26(c), etc.

[0106] The position of the joining surface 106 of the receiving member 30 is approximately the center position in the Y direction as shown in FIG. 27(a), it may be located along one end face in the Y direction of the anchor disposition groove 104. It goes without saying that the coupling surface 106 may be set to form a plane parallel to the XY plane as shown in FIG. 27(b).

[0107] The internal shape of the anchor mounting groove 104 can be set as appropriate, but is preferably a shape that allows the anchor portion 32 to fit into it. That is, if the anchor portion 32 is a so-called deformed steel bar having protrusions such as knots or ribs on its outer periphery, the inner periphery of the anchor mounting groove 104 is provided with a recess that engages with the protrusion of the anchor portion 32, as shown in FIG. 28(a). If the anchor portion 32 is a U-shaped rebar, the anchor mounting groove 104 is formed in a U-shape, as shown in FIG. 28(b). If the insertion end of the anchor portion 32 has a widening shape, the opening of the anchor mounting groove 104 is formed so as to widen from the opening edge toward the rear in the X direction, as shown in FIG. 28(c). When the receiving member 30 is thus configured using the sections 100 and 102, the shape of the anchor mounting groove 104 can be set as appropriate.

[0108] Furthermore, the number of anchor portions 32 arranged on the receiving member 30 is not limited to one, but may be multiple, in which case multiple anchor arrangement grooves 104 are formed according to the number of anchor portions 32.

[0109] Furthermore, although the anchor placement groove 104 has been described as being formed by a plurality of partial bodies 100, 102, this is not limitative, and for example, the anchor placement groove 104 may be provided in one partial body 100. Of course, if there are a plurality of anchor portions 32, the anchor placement groove 104 may be provided for each partial body 100, 102. Furthermore, in the above-described embodiments, the accommodating portion 34 has been described as having a recessed shape, but it goes without saying that the accommodating portion 34 may have a hole shape that penetrates the receiving members 30, 30a.

[0110] Furthermore, although the connecting member 20 and the receiving members 30, 30a are fixed by fastening the shaft portion 26, a separate member may be provided to press the engaging portion 22 in the receiving members 30, 30a against the bottom of the accommodation portion 34, thereby firmly fixing the connecting member 20 to the receiving members 30, 30a. For example, a lid member may be provided as a separate member that fits into the opening of the accommodation portion 34. As shown in FIG. 29 , the lid member 120 has a shape that fits into the opening edge (installation portion) of the accommodation portion 34, and one end in the fitting direction protrudes into the accommodation portion 34 so as to press the engaging portion 22. By fitting the lid member 120 into the opening edge of the accommodation portion 34 in this way, the accommodation portion 34 is closed while the engaging portion 22 is held down.

[0111] In order to more firmly fix the lid member 120 to the storage portion 34, the lid member 120 and the storage portion 34 may be fastened together. That is, a male thread region may be formed on the outer peripheral surface of the lid member 120, and a female thread region may be formed on the inner peripheral surface of the storage portion 34 on the opening edge side, and the lid member 120 may be screwed onto the storage portion 34 to fix it.

[0112] 30(a), the accommodation portion 34 has a circular inner periphery formed at the open end (upper end) thereof, and a female thread region 130 having a female thread spiral on the circumferential surface. The female thread region 130 has a hole shape with a larger diameter than the region of the accommodation portion 34 into which the engaging portion 22 fits, so as not to interfere with the engaging portion 22 fitted into the accommodation portion 34.

[0113] On the other hand, the male thread region of the cover member 120 has a cylindrical male thread region 122 and a protrusion 124 that protrudes in the axial direction. The male thread region 122 has a male thread spiral groove on its outer periphery that threadably mates with the female thread spiral of the female thread region 130. The protrusion 124 is disposed on the tip side of the male thread region 122 and protrudes in the axial direction. 30(b), by fastening the male thread region 122 to the female thread region 130, the protrusion 124 comes into contact with the engaging portion 22, so that the cover member 120 can apply a downward pressing force to the engaging portion 22 while closing the accommodation portion 34. The lengths of the male thread region 122 and the female thread region 130 can be set as appropriate.

[0114] The protruding length of the protrusion 124 is not particularly limited, but if the protrusion 124 is set to press against the engaging portion 22 when the cover member 120 is fastened and fixed to the storage portion 34, it is possible to control the pressing force applied to the engaging portion 22 by tightening the cover member 120. Furthermore, in the above description, the cover member 120 and the storage section 34 are fastened together, but other fastening means such as adhesive, welding, or melt-adhesion may also be used. Furthermore, the cover member 120 may be provided with a seal member so that the cover member 120 can be fitted to the storage portion 34 in a watertight or liquid-tight manner.

[0115] FIG. 31 is a perspective view showing the configuration of another joint. Here, joint 200 includes receiver members 210, 210a having a generally conical receiving portion 212 and a connecting member 220 having a generally conical engaging portion 222. The receiver members 210, 210a have concave-convex engaging portions 214, 214a that protrude outward in the X direction. The concave-convex engaging portions 214, 214a have concaves and convexes that can engage with each other in the Z direction by meshing. Therefore, when the concave-convex engaging portions 214, 214a of the receiver members 210, 210a mesh with each other, their relative positions become predetermined. The receiving portion 212 has an open top, and a female screw thread is formed on the inner circumferential surface near the opening for mounting a cover member 230. That is, the shape of the inner circumferential surface of the receiving portion 212 is designed so that a cover member 230 having a male screw thread on its outer circumferential surface can be screwed and secured.

[0116] In the receiving members 210, 210a, the notches 216 into which the bridge portions 220 can be fitted are formed in a shape that widens in the X direction. That is, they are formed so as to gradually widen from the accommodation portion 212 side toward the outside in the X direction.

[0117] 32 shows a connecting member 220, (a) being a perspective view and (b) being a side view, and the connecting member 220 is formed by a pair of engaging portions 222 connected by a bridging portion 224. Here, the bridging portion 224 has a base portion connected to the engaging portion 222 that widens in an inverted V shape so as to correspond to the shape of the notch 216. In other words, the bridging portion 224 has a shape in which the width along the Y direction gradually widens from the base side (the engaging portion 222 side) toward the center.

[0118] Furthermore, at least a pair of connecting portion side locking portions 224a protruding in the Z direction are formed on the lower end surface of the connecting member 220. The connecting portion side locking portions 224a are disposed at positions facing the shaft portion 26 in the X direction, and in this case, are disposed on both sides in the X direction with the shaft portion 26 in between. The connecting portion side locking portions 224a function as part of a rotation prevention mechanism for the pressing body 226, which will be described later.

[0119] The shank 26 is inserted into a central insertion hole of the bridging portion 224, and a pressing body 226 is disposed on an externally threaded portion 26a formed on the shank 26. The pressing body 226 has a main body portion that is generally rectangular in plan view, having short and long sides, and a pressing body-side locking portion 226a that is a cylindrical protrusion that is oval or rectangular in plan view and is disposed on the surface of the main body portion facing the bridging portion 224. Similar to the pressing body 28 described above, the pressing body 226 also has a female threaded hole that screws into the externally threaded portion 26a and through which the shank 26 can be inserted. The long side of the pressing body-side locking portion 226a in plan view is parallel to the long side of the pressing body 226 and is longer than the distance between the pair of connecting portion-side locking portions 224a, and the width is set so that the short side can be positioned between the pair of connecting portion-side locking portions 224a. Therefore, the short side portions of the pressing body-side locking portions 226a are positioned between the connecting portion-side locking portions 224a, thereby forming a rotation prevention mechanism for the pressing body 226. In other words, when the pressing body 226 rotates from a state in which the pressing body-side locking portions 226a are positioned between the connecting portion-side locking portions 224a, the long side portions of the pressing body-side locking portions 226a are longer than the distance between the connecting portion-side locking portions 224a, and therefore the pressing body-side locking portions 226a come into contact with the connecting portion-side locking portions 224a and are locked in the circumferential direction. As a result, this functions to prevent the pressing body 226 from rotating.

[0120] According to the joint 200 configured as described above, when the connecting member 220 is installed on the receiving members 210, 210a with the head 26b pinched, the pressing body 226 can be prevented from rotating from a predetermined position. Specifically, when the pressing body 226 shown in FIG. 33 is oriented so that its short sides are parallel to the X direction and the connecting member 220 is lifted by pinching the head 26b, the shaft 26 rises relative to the bridging portion 224, and the pressing body-side locking portion 226a abuts against the lower end surface of the bridging portion 224 between the pair of connecting-side locking portions 224a. At this time, even if an external force that could rotate the pressing body 226 relative to the shaft 26 acts on it, the pressing body-side locking portion 226a abuts against the connecting body-side locking portion 224a, restricting rotation. Therefore, it is possible to prevent the pressing body 226 from coming into contact with the receiving members 210, 210a while the engaging portion 222 is being fitted into the receiving portion 212 while the head portion 26b is being held. Of course, here, the connecting member 220 is configured to prevent relative rotation with the pressing body 226 by the connecting side locking portion 224a provided on the connecting member 220 side, but this is not limited to this, and a locking portion that can be locked to the connecting member 220 may be provided on the pressing body 226 side, for example, on the upper surface of the pressing body 226.

[0121] Furthermore, by using the joint 200, the range of positional misalignment between the receiver members along the Y direction that can be aligned can be expanded compared to when the quadrangular pyramidal engaging portion 22 described above is fitted into the accommodating portion 34. Specifically, as shown in Fig. 34, even if the connecting member 220 is tilted with respect to the X and Y axes on the XY plane, the engaging portion 222 can be accommodated in the accommodating portion 212. Therefore, a wider range of positional misalignment along the Y direction can be accommodated.

[0122] Furthermore, by forming the shape of the notch 216 and the base of the bridge portion 224 in a V-shape, the engagement strength between the conical accommodating portion 212 and the engaging portion 222 in the X direction can be improved. Since the concave-convex engaging portions 214, 214a are located on both sides of the notch 216 in the Y direction, the gap between the concave-convex engaging portions 214, 214a along the Y direction for the pressing body 226 to pass through will be narrowed due to misalignment of the receiving members 210, 210a in the Y direction. Therefore, the installation positions and widths along the Y direction of the concave-convex engaging portions 214, 214a are set so that a gap can be secured to reliably allow the pressing body 226 to pass through even if at least the receiving members 210, 210a are misaligned in the Y direction.

[0123] Furthermore, the screw structure between the lid member and the storage portion is not limited to the above, and may be configured, for example, by forming a male screw helical groove on the storage portion side and a female screw helical rib on the lid member side. That is, a substantially cylindrical tube portion surrounding the opening of the storage portion is disposed on the upper surface of the engagement portion, and a male screw helical groove is formed on the outer peripheral surface of the tube portion, while the lid member has a concave cross section and a female screw helical rib is formed on the inner peripheral surface, and the female screw helical rib of the lid member is screwed into the male screw helical groove of the tube portion, thereby closing the opening at the top of the storage portion with the lid member.

[0124] Furthermore, although it has been described that the precast floor slab 1 is moved when the inclined surfaces of the engaging portion 22 and the accommodating portion 34 come into contact with each other and the outer circumferential surface of the engaging portion 22 presses against the inner circumferential surface of the accommodating portion 34, the precast floor slab 1 can be moved if at least one of the outer circumferential surface of the engaging portion 22 or the inner circumferential surface of the accommodating portion 34 is an inclined surface. For example, as shown in Figure 38(a), the outer circumferential surface of the engaging portion 22 may have a vertical surface 400 (non-inclined surface) parallel to the insertion direction, and the precast floor slab 1 may be moved when the inclined inner circumferential surface 40a (or inner circumferential surface 40b) comes into contact with or presses against the vertical surface 400. 38(b), the engaging portion 22 may have an inclined outer peripheral surface, and the storage portion 34 may have a vertical surface 410 (non-inclined surface) on the inner peripheral surface of the opening side, and the precast deck 1 may be moved when the inclined outer peripheral surface of the engaging portion 22 abuts or presses against the vertical surface 410 of the storage portion 34. Note that the vertical surfaces 400, 410 come into contact with the inclined surface from the corners, so they may be chamfered to form angular or rounded surfaces so as not to damage the inclined surface.

[0125] The shank 26 may also be configured to break upon application of a predetermined torque and / or axial force, allowing a portion of the shank 26 to be detached and dropped together with the pressing body threaded onto the male threaded portion 26a. For example, a weakened portion 310 (see FIG. 35 ) having a V-shaped groove cut in the circumferential direction may be provided on the circumferential surface of the male threaded portion 26a of the shank 26. When a predetermined torque or greater is applied to the shank 26, the shank 26 breaks at the weakened portion 310, allowing the male threaded portion 26a extending below the bridge portion 24 to be removed. The cutting to provide the weakened portion 310 may be performed by any appropriate method, such as cutting or plastic processing, and the method is not limited thereto. Furthermore, a hole may be formed in the male threaded portion 26a that is detached upon detachment, or a suspender or the like may be provided to connect a cord, chain, wire, or the like to the hole or suspender. By connecting a cord, chain, wire, or the like to the male threaded portion 26a in this manner, the detached and dropped male threaded portion 26a and the pressing body 28 threaded thereto can be easily retrieved by pulling them up. Also, instead of the male screw portion 26a, a hole or a hanging device may be provided on the pressing body 28 side to which a string, chain, wire, etc. can be connected, which also makes it possible to easily pull up and recover the male screw portion 26a and pressing body 28 after they have fallen.

[0126] Furthermore, although the connection member 20 and the receiving members 30, 30a are fixed by fastening the shaft portion 26 and the pressing body 28, a bolt may also be used to fix the engaging portion 22 and the receiving member 30 (30a). For example, a through-hole 240 (see FIG. 35) parallel to the axial direction may be drilled in the engaging portion 22, and a female screw hole (see FIG. 35) may be formed in the bottom of the accommodating portion 34. Then, a bolt 250 (see FIG. 35) may be inserted through the through-hole 240 of the engaging portion 22 and screwed into the female screw hole 260 to fix the engaging portion 22 to the receiving member 30 (30a).

[0127] Figure 35 shows the configuration of another joint, where (a) is a plan view, (b) is a cross-sectional view taken along line AA, and (c) is a cross-sectional view taken along line BB. A through-hole 240 is provided in the engaging portion 22, and the through-hole 240 is formed by drilling approximately the center of the engaging portion 22. The through-hole 240 is provided along the direction in which the engaging portion 22 is fitted into the accommodating portion 34. The receiving members 30, 30a have a female threaded hole 260 in their bottoms. Furthermore, a bolt 250 is provided to fix the engaging portion 22 and the receiving members 30, 30a together. The bolt 250 can be inserted into the through hole 240 and can be threaded into the female threaded hole 260, and has a shaft portion 252 with a male thread portion 250a formed at one end, and a head portion 254 with a hexagonal outer periphery. The head portion 254 has an outer shape that is longer in the direction perpendicular to the axis than the shaft portion 252.

[0128] The bolt 250 is tightened after the engaging portion 22 is fitted into the accommodating portion 34. Specifically, first, the engaging portion 22 is fitted into the accommodating portion 34. Then, the bolt 250 is inserted into the through-hole 240 of the engaging portion 22, and the male threaded portion 250a is screwed into the female threaded hole 260 and tightened.

[0129] 35(b) 。 In other words, the opening edge may have a slope for guiding the engagement portion 22 into the engagement, and the inner peripheral surface may have a vertical surface (first surface) 300 extending substantially vertically between the opening edge and the bottom as shown in FIG. 35(b) . The vertical surface (first surface) 300 extends substantially parallel to the direction of engagement of the engagement portion 22 from the slope, and the tapered surface (second surface) 302 gradually narrows from the vertical surface 300 toward the bottom. In this case, the outer peripheral shape of the engagement portion 22 may be a shape that follows the inner peripheral shape of the engagement portion 22. That is, when the engaging portion 22 is accommodated in the accommodating portion 34, the engaging portion 22 may have an outer peripheral surface including a vertical surface 22a that can be in sliding contact with the vertical surface 300 in a direction parallel to the vertical surface 300, and an inclined surface 22b that is inclined parallel to the inclined surface 302 and can abut against the inclined surface 302.

[0130] Furthermore, in the above-described embodiment, it has been described that the height positions of the precast floor slabs 1, 1 can be aligned even if they are misaligned in the height direction, but it is also possible to fix the precast floor slabs 1, 1 to each other using the joints 10 when they are misaligned by a predetermined amount in the height direction. In this case, the engaging portion 22 is fitted into the receiving portion 34 of the receiving portion 30, 30a, whichever is set to the lower height, by interposing a spacer (intervening portion) 270 in the innermost portion in the depth direction where the engaging portion 22 is fitted.

[0131] 36 shows the connection of support members 30, 30a of different heights, with (a) being a cross-sectional view showing support members 30, 30a at different heights, and (b) being a cross-sectional view showing support members 30, 30a fixed by a joint. The spacer 270 is a substantially annular washer-like member with a central hole through which the bolt 250 can be inserted. The spacer 270 also limits the depth to which the engaging portion 22 can be inserted, positioning the engaging portion 22 within the accommodating portion 34 at a position shallower by a depth h from the innermost portion. That is, the spacer 270 abuts against the engaging portion 22 within the accommodating portion 34, limiting movement of the engaging portion 22 in the insertion direction.

[0132] Specifically, when opposing precast decks (not shown) are set at different heights, with the support member 30 positioned higher than the support member 30a by a length h (see FIG. 36(a)), a spacer 270 with a thickness that matches the height difference (length h) between the support members 30 and 30a is placed before the connecting member 20 is installed. When placing the connecting member 20, torque is applied in the fastening direction to the shaft portion 26 inserted into the bridging portion 24. As a result, as shown in FIG. 36(b), the pressing body 28 abuts against the lower end surface of the support member 30a, preventing the shaft portion 26 from rotating in the fastening direction. Then, as shown in FIG. 36(c), a bolt 250 is inserted into the through-hole 240 of the engaging portion 22, and the male threaded portion 250a is threaded into the female threaded hole 260, and the bolt 250 is rotated in the fastening direction. In this state, further torque is applied to the shank 26 in the tightening direction, inputting an overload to the fragile portion 310, causing the shank 26 to break at the fragile portion 310, and the male thread portion 26a is separated and dropped together with the pressing body 28, as shown in Figure 36(d). Of course, it is desirable to pick up and remove the dropped portion. Furthermore, the part of the shank 26 remaining after breaking may be removed by pulling it out from the bridge portion 24.

[0133] In this way, by arranging the spacer 270, the position of the engaging portion 22 that is inserted into the receiving member 30a is shallower by a length h than the innermost portion, and the receiving members 30, 30a can be set to a predetermined height difference, while the connecting member 20 can be arranged so that the bridging portion 24 is in an approximately horizontal position between the receiving members 30, 30a and both engaging portions 22 are maintained approximately horizontally.

[0134] Furthermore, the depth to which the engaging portion 22 can be fitted may be restricted by a method other than providing the spacer 270. For example, the depth to which the engaging portion 22 can be fitted may be restricted by providing an intervening member 280 that is displaceable in the depth direction, as shown in FIG. 37(a). The intervening member 280 is a substantially cylindrical member that is interposed between the female threaded hole 260 and the bolt 250. The intervening member 280 has an outer peripheral male threaded portion 280a formed on its outer circumferential surface that can be threaded into the female threaded hole 260, and an inner peripheral female threaded portion 280b formed on its inner circumferential surface that can be threaded with the male threaded portion 250a.

[0135] The intervening member 280 can protrude into the accommodation portion 34 by rotating relative to the receiving member 30a. That is, the outer peripheral male thread portion 280a of the intervening member 280 can thread into the female threaded hole 260, so that the intervening member 280 can enter the accommodation portion 34 along the axial direction. Therefore, by positioning the intervening member 280 so that the tip of the intervening member 280 along the direction of advancement is present within the accommodation portion 34, the depth to which the engaging portion 22 can be inserted can be controlled. For example, as shown in FIG. 37(b), if the height positions of opposing precast floor slabs (not shown) are different and the receiving member 30a is higher than the receiving member 30 by a length h', before installing the connecting member 20, the intervening member 280 is positioned so that it protrudes into the accommodation portion 34 by a length that matches the height difference (length h') between the receiving members 30, 30a. Then, the connecting member 20 is placed.

[0136] Therefore, the depth to which the engaging portion 22 can be inserted is restricted by abutting against the intervening member 280. Therefore, as in the case of disposing the spacer 270, a desired height difference can be set between the receiving members 30, 30a, and the connecting member 20 can be disposed so that the bridging portion 24 is in a substantially horizontal position between the receiving members 30, 30a and both engaging portions 22 are disposed substantially horizontally. Furthermore, because the length of protrusion of the interposing member 280 into the accommodation portion 34 can be changed by threading it into the female threaded hole 260, it is possible to more flexibly accommodate height differences between the receiving members 30, 30a than by providing the spacer 270. That is, in the case of the spacer 270, it is necessary to prepare multiple spacers of various thicknesses to accommodate various height differences, whereas in the case of the interposing member 280, it is only necessary to manage the number of rotations, making it easier to accommodate height differences than in the case of a spacer. Of course, when using the spacer 270, once the unit thickness is set, it is easy to accommodate height differences in stages by changing the number of stacked sheets.

[0137] Furthermore, in the above-described embodiments, the shank 26 has been described as having the head 26b, but the shank 26 may have a generally rod-like shape with the head 26b omitted. However, the outer peripheral shape is set so that it can axially engage with the bridging portion 24. Specifically, as shown in Figure 39(a), the shank 430 may have a male threaded portion 432 at one end, and the bridging portion 24 may have a female threaded hole 440 at the center that screws into the male threaded portion 432.

[0138] The shaft portion 430 also has a male thread portion 434 at the other end, into which a separate female thread member 450 can be threaded, and the pressing body 28 is supported by the female thread member 450, thereby being arranged to be freely fitted with respect to the shaft portion 430. The female thread member 450 is a substantially disk-shaped member with an opening at the center, and a female thread portion that screws onto the male thread portion 434 is formed on the inner peripheral surface of the opening. Therefore, it is also possible to configure the pressing body 28 to be loosely fitted into the shaft portion 430, and to attach the pressing body 28 to the shaft portion 430 by threading the female thread member 450 onto the male thread portion 434.

[0139] Furthermore, the thread directions of the male threaded portion 432 and the male threaded portion 434 may be set to be opposite to each other. For example, if the male threaded portion 432 and the female threaded hole 440 are right-handed threads and the male threaded portion 434 and the female threaded member 450 are left-handed threads, then by rotating the shaft portion 430 counterclockwise, the female threaded member 450 (and the pressing body 28) and the bridging portion 24 can be moved in a direction in which they approach each other relatively. That is, when the shaft portion 430 rotates leftward, the female screw member 450 advances in the tightening direction (toward one end where the bridging portion 24, etc. shown in FIG. 39(b) are located) relative to the shaft portion 430, and the pressing body 28 is pushed by the female screw member 450 and moves in the axial direction. Meanwhile, the bridging portion 24 advances in the loosening direction (toward the other end where the female screw portion 450, etc. shown in FIG. 39(b) are located) relative to the shaft portion 430. Therefore, the pressing body 28 and the bridging portion 24 move to positions where they press against each other, and it is possible to position the precast deck slabs 1, 1 in the same way as in the first embodiment.

[0140] When the shaft portion 430 is arranged as described above, instead of providing the female threaded hole 440, a separate female threaded member 460 may be provided, and as shown in Figure 39(c), the female threaded member 460 may be screwed into the male threaded portion 432 to regulate the relative position of the bridging portion 24 with respect to the shaft portion 430.

[0141] Furthermore, while the shank 430 has been described as having male thread portions 432, 434 with different orientations at one end and the other end, this is not limited thereto and may have two types of spiral grooves, a right-handed spiral groove and a left-handed spiral groove, overlapping in the same area. For details of male threads with such two types of spiral grooves, see Japanese Patent No. 4663813, owned by the inventor of the present application. When using a shank with such pairs of spiral grooves, it is also possible to form spiral grooves over the entire axial length of the shank.

[0142] The attachment target members of the joints of the respective embodiments are not limited to precast deck slabs. The attachment target members are not limited in material or shape, and can be any members as long as they can be joined by connecting the attachment target members with the connecting members. The attachment target members can be made of materials such as concrete, ceramics, glass, metal, synthetic resin, natural resin, wood, and various composite materials. The attachment target members can be shaped, for example, in the form of plates, columns, or blocks, and can be used to join the same or different types of members. The attachment target members can also be used to join various items, such as precast concrete members, furniture, building materials, housing frame materials, and various machines. [Explanation of symbols]

[0143] 1...Precast deck, 10, 60...Joint, 20...Connecting member, 22...Engagement portion, 24...Bridge portion, 26...Shaft portion, 26a...Male thread portion, 26b...Head portion, 28...Pressing body, 28a...Short side portion, 28b...Long side portion, 30, 30a...Receiving member, 32...Anchor portion, 34...Storage portion, 34a...Lip portion, 34b...Lower end surface, 36...Regulating portion, 38...Step portion, 40a, 40b, 40c, 40d...Inner peripheral surface, 50...Head side unevenness, 52...Bridge portion side unevenness, 50 a, 52a...inclined surface, 50b, 52b...vertical surface, 62...concave-convex engagement portion, 62a, 62b...concave-convex, 70...urging member, 80...long connecting member, 80a...long bridging portion, 82...short connecting member, 82a...short bridging portion, 86...through hole, 88...male thread pin, 88a...male thread portion, 88b...head, 100, 102...partial body, 104...anchor arrangement groove, 106...joining surface, 120...cover member, 122...male thread region, 124...protrusion, 130...female thread region.

Claims

1. a pair of fitted portions each having a recessed receiving portion provided on a pair of opposing attachment target members; a pair of engaging portions that can be fitted into the accommodating portion; a connecting member having a bridge portion connecting the pair of engaging portions; an installation portion that configures an opening edge portion of the storage portion; a female thread region provided on a circular inner periphery formed at an open end of the installation portion; a cover member having a male threaded region that is fastened to the female threaded region of the installation portion and a protrusion that protrudes beyond the male threaded region, and which, when closing the opening of the accommodation portion, is capable of controlling the pressing force that is applied to the engaging portion that is fitted into the fitted portion and that is abutted and pressed by the protrusion by fastening the male threaded region into the female threaded region; A joint characterized by comprising:

2. 2. The joint according to claim 1, wherein the installation portion has an opening wider than an inner peripheral surface of the opening edge portion.

3. 3. The joint according to claim 1, wherein the inserted portion has an inner circumferential surface that narrows from an opening edge on one end side to the other end side.

4. 4. A joint according to claim 1, wherein the connecting member has a shaft portion that is inserted into the bridging portion in the fitting direction of the engaging portion, and an abutment portion that is arranged at one end of the shaft portion.

5. 5. The joint according to claim 4, wherein the shank is configured to break when a torque and / or axial force greater than a predetermined value is applied.

6. 6. A joint according to claim 1, further comprising a fixing portion for fixing the engaging portion and the inserted portion together.

7. The fixing portion is a male threaded body, the engaging portion has a hole through which the male threaded body is inserted, 7. The joint according to claim 6, wherein the inserted portion has an internally threaded hole that can be threadedly engaged with the externally threaded body.

8. A method for joining members, comprising joining members to be attached to each other using the joint according to any one of claims 1 to 7.

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