Joining methods for joints and components

Abstract

To provide means for improving workability with a simple structure including relative positioning when joining members to be attached.SOLUTION: A joint is provided with a pair of fit portions provided on a pair of members to be mounted facing each other, and a connecting member having a pair of engaging portions that can be fitted into the fit portions and a cross-linking portion that connects the pair of engaging portions, the cross-linked portion having a hole into which a shaft portion can be inserted along the fitting direction of the engaging portion, and a positioning mechanism being formed between the fit portion and the engaging portion when the engaging portion is fitted into the fit portion.SELECTED DRAWING: Figure 1

Description

Technical Field

[0004] , , , ,

[0001] The present invention relates to joints for joining a plurality of members and the like.

Background Art

[0002] Conventionally, in buildings including buildings such as office buildings and residential houses, structures such as bridges, segments, precast products, and furniture, etc., buildings, structures, furniture, etc. are constructed by joining members together. As a method of joining members, for example, a method using loop bars (see, for example, Patent Document 1) is known as a method of joining precast floor slabs of a bridge. Also, a method of joining floor slabs by providing convex portions or concave portions on the surfaces for joining the floor slabs and disposing the convex portions of one floor slab within the concave portions of the other floor slab (see, for example, Patent Document 2) is known. Also, as a method of joining other members, a so-called cotter joint (see, for example, Patent Document 3) in which C-shaped joint fittings are projected from the respective side surfaces of a pair of members and a fitting portion of an H-shaped joint fitting is disposed within a fitting concave portion of the C-shaped joint fitting is known.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the method described in Patent Document 1 above requires a long working time for the installation of the precast slab because it involves bending the reinforcing bars on-site, inserting wires into the loops of the reinforcing bars, and then pouring concrete. Furthermore, since the inner bending radius of the reinforcing bar loops is determined to some extent, the thickness of the precast slab cannot be reduced, making it impossible to apply to the specified planned height. Additionally, the increased weight of the precast slab leads to increased reaction forces and stresses, which is structurally disadvantageous to the substructure, etc.

[0005] Furthermore, in the method described in Patent Document 2, although the members are bonded to each other via a filler material, no steel rods or prestress are introduced to apply stress in the bridge axis direction to the deck slab. This presents problems such as gaps forming between the deck slabs due to expansion and contraction of the deck slab due to temperature changes, and the deck slabs shifting position in the direction perpendicular to the bridge axis, making it impossible to maintain the joined state.

[0006] Furthermore, in the method described in Patent Document 3, the fitting portion of the H-type joint fitting can be fitted into the fitting recess of each C-type joint fitting only when the pair of members are positioned in a predetermined location, and only then can the C-type joint fitting and the H-type joint fitting be fixed with bolts. Therefore, if the members are not in their predetermined positions, there is a problem that the fitting portion of the H-type joint fitting cannot be fitted into the fitting recesses of both C-type joint fittings and fixed with bolts. In addition, with the cotter joint described in Patent Document 3, it is not possible to position the members by fitting the H-type joint fitting onto the C-type joint fitting, so when joining the members, it is necessary to perform positioning work on the members without errors. Moreover, if the members are precast deck slabs used in bridges, there is a problem that adjusting the position by placing multiple chain blocks on the precast deck slabs and aligning them in the direction along the bridge axis, perpendicular to the bridge axis, and in the height direction, as well as correcting the inclination relative to the bridge surface, becomes extremely difficult, resulting in long working times and very poor work efficiency. Furthermore, if the positioning of the components is performed using the fastening force of the bolts that fasten the mating parts of the H-type joint to the C-type joint, that is, if the positions of the components are slightly misaligned and the mating part of the H-type joint is partially inserted into the mating recess of the C-type joint, and the bolts are forcibly tightened to push the H-type joint into place with the axial force of the bolts, while attempting to align the components together with the C-type joint, there is a problem in that the bolts cannot be tightened accurately. In other words, it is extremely difficult to tighten each bolt simultaneously at the same speed (or torque), and in reality, they are tightened gradually one side at a time. However, this work is not easy and is greatly influenced by the worker's sense and skill, resulting in the problem that the state of fixation varies depending on the worker. Specifically, when the bolts are tightened one side at a time, the H-type joint will tilt as the tightened side sinks in and the opposite side relatively rises. As a result, the H-shaped joint fitting may end up being fixed in a different position and at an angle, instead of being fixed in its intended position and orientation. This can lead to abnormal fastening force, reduced fatigue strength, and unintended problems with joint compression force. Therefore, it is desirable that the H-shaped joint fitting be installed and fixed in a way that prevents it from tilting horizontally at all times.

[0007] This invention was made through diligent research by the inventors in view of the above-mentioned problems, and aims to provide a means to improve workability, including relative positioning, when joining mounting members together, with a simple structure. [Means for solving the problem]

[0008] The joint of the present invention comprises a pair of receiving portions provided on a pair of opposing mounting members, and a connecting member having a pair of engaging portions that can be fitted into the receiving portions and a bridging portion connecting the pair of engaging portions, wherein the bridging portion has a hole into which a shaft portion can be inserted along the direction in which the engaging portion is fitted, and when the engaging portion is fitted into the receiving portion, a positioning mechanism is formed between the receiving portion and the engaging portion, and the positioning mechanism allows the outer circumferential surface of the engaging portion to abut against or press against the inner circumferential surface of the receiving portion, thereby positioning the relative positions of the mounting members to fall within a predetermined range.

[0009] Furthermore, the joint of the present invention is characterized in that the positioning mechanism has contact surfaces on the outer circumferential surface of the engaging portion and / or the inner circumferential surface of the fitted portion that can generate a pressing force in a direction perpendicular to the fitting direction with respect to the fitted portion.

[0010] Furthermore, the joint of the present invention is characterized in that the hole is a through hole that penetrates the bridging portion.

[0011] Furthermore, the joint of the present invention comprises a contact body that is rotatable together with the shaft, and the contact body is characterized in that, after rotating together with the shaft to a predetermined angle, it engages with the fitted portion in the circumferential direction and its rotation is restricted.

[0012] Furthermore, the joint of the present invention is characterized in that the shaft portion has a male threaded portion, and the contact body has a female threaded hole into which the male threaded portion is screwed.

[0013] Furthermore, the joint of the present invention is characterized by comprising a biasing member that displaces the shaft portion in the axial direction so that the contact body abuts against one of the fitted portion and the connecting portion.

[0014] Furthermore, the joint of the present invention is characterized in that the abutment body can abut one of the fitted portion and the bridging portion, the shaft portion has a seating surface that abuts the other of the fitted portion and the bridging portion, and the fitted portion and the bridging portion are sandwiched in the axial direction between the seating surface and the abutment body.

[0015] Furthermore, the joint of the present invention is characterized in that the hole has a female threaded portion on its inner circumference, and the shaft portion has a male threaded portion that screws into the female threaded portion and a contact portion that can abut against or press against the fitted portion.

[0016] Furthermore, the joint of the present invention is characterized in that the hole has a female threaded portion on its inner circumference, the shaft portion has a first male threaded portion that screws into the female threaded portion, and a second male threaded portion with a screw facing the opposite direction to the first male threaded portion, and a female threaded body that screws into the second male threaded portion and supports the contact body.

[0017] Furthermore, the joint of the present invention is characterized in that the shaft portion has a first male threaded portion and a second male threaded portion with a thread facing the opposite direction to the first male threaded portion, and comprises a female threaded member that can be screwed onto the first male threaded portion and regulates the relative position of the bridging portion with respect to the shaft portion, and a female threaded body that is screwed onto the second male threaded portion and supports the contact body.

[0018] Furthermore, the joint of the present invention is characterized in that the shaft portion is formed such that the first male thread portion and the second male thread portion overlap in the same region.

[0019] Furthermore, the joint of the present invention is a joint having a pair of fitting portions provided on each of a pair of opposing mounting members, and a connecting member having a pair of engaging portions that can be fitted into the fitting portions and a bridging portion that connects the pair of engaging portions, characterized in that by fitting the engaging portions into the fitting portions, the engaging portions can abut or press against the inner circumferential surface of the fitting portions, and the relative positions of the mounting members are positioned within a predetermined range.

[0020] Furthermore, the joint of the present invention is characterized in that the inner circumferential surface of the fitted portion has at least a plurality of inclined surfaces with different orientations.

[0021] Furthermore, the joint of the present invention is characterized in that the inner circumferential surface of the fitted portion includes an inclined surface that is inclined along the arrangement direction of the fitted portion.

[0022] In addition, the joint of the present invention is characterized in that the inner peripheral surface of the inserted portion includes an inclined surface that is inclined along a direction orthogonal to the arrangement direction of the inserted portion.

[0023] In addition, the joint of the present invention is characterized in that, inside the inner peripheral surface of the inserted portion, the opposing surfaces are inclined at different angles.

[0024] In addition, the joint of the present invention is characterized in that, inside the inner peripheral surface of the inserted portion, the opposing surfaces are inclined at symmetric angles.

[0025] In addition, the joint of the present invention is characterized in that the inner peripheral surface of the inserted portion is inclined in a pyramid shape or a cone shape.

[0026] In addition, the joint of the present invention is characterized in that each of the engaging portions is disposed at an equal distance from the shaft portion.

[0027] In addition, the joint of the present invention is characterized in that each of the engaging portions is disposed at a different distance from the shaft portion.

[0028] In addition, the joint of the present invention is characterized in that the engaging portion has an outer peripheral surface that contacts the inner peripheral surface of the inserted portion without a gap.

[0029] In addition, the joint of the present invention includes concavo-convex engaging portions in a concavo-convex state that protrude in a direction facing each other between the pair of inserted portions, and the inserted portions are engaged with each other in the insertion direction of the engaging portion by meshing the opposing concavo-convex engaging portions with each other.

[0030] In addition, the joint of the present invention is characterized in that three or more of the engaging portions are integrally provided for one of the cross-bridging portions.

[0031] In addition, the joint of the present invention is characterized in that the inserted portion is composed of a plurality of separate partial bodies, and an anchor arrangement groove for arranging an anchor fixed to the attachment target member is composed of one or more of the above partial bodies.

[0032] Furthermore, the joint of the present invention is characterized in that the surface of the component that forms the bonding surface with other components is flat, has minute irregularities, and / or has an irregular surface that allows for mutual fitting.

[0033] Furthermore, the joint of the present invention is characterized in that the opening edge of the fitted portion has an installation portion on which a cover member can be installed, and the cover member closes the opening of the fitted portion when installed on the installation portion.

[0034] Furthermore, the joint of the present invention is characterized in that, when the cover member is installed in the installation portion, one end of the cover member abuts against or presses against the engaging portion which is fitted into the receiving portion.

[0035] Furthermore, the joint of the present invention is characterized in that the lid mounting portion has an opening wider than the inner circumferential surface and has a female thread region with a female thread surface, and the lid member has a male thread region on its surface with a male thread surface that screws into the female thread surface of the female thread region.

[0036] Furthermore, the joint of the present invention is a joint having a pair of fitting portions provided on a pair of opposing mounting members, and a connecting member having a pair of engaging portions that can be fitted into the fitting portions and a bridging portion that connects the pair of engaging portions, wherein the opening edge of the fitting portion has an installation portion on which a cover member can be installed, and the cover member closes the opening of the fitting portion when installed on the installation portion.

[0037] Furthermore, the joint of the present invention is characterized in that, when the cover member is installed in the installation portion, one end of the cover member abuts against or presses against the engaging portion which is fitted into the receiving portion.

[0038] Furthermore, the joint of the present invention is characterized in that the lid mounting portion has an opening wider than the inner circumferential surface and has a female thread region with a female thread surface, and the lid member has a male thread region on its surface with a male thread surface that screws into the female thread surface of the female thread region.

[0039] Furthermore, the joint of the present invention is characterized in that the fitted portion has an inner circumferential surface that narrows from the opening edge on one end to the other end.

[0040] Furthermore, the joint of the present invention is characterized in that the connecting member has a shaft portion that is inserted through the bridging portion along the insertion direction of the engaging portion, and a contact portion that is disposed at one end of the shaft portion.

[0041] Furthermore, the joint of the present invention is characterized by having a fixing portion that fixes the engaging portion and the fitted portion.

[0042] 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 receiving portion has a female threaded hole that can be screwed into the male threaded body.

[0043] Furthermore, the joint of the present invention is characterized by comprising an intervening portion for restricting the position of the engaging portion in the insertion direction within the fitted portion, interposing the intervening portion between the engaging portion and the fitted portion, and making the distance between the engaging portion and the innermost part of the fitted portion different on one side of the fitted portion and the other side of the fitted portion, thereby making the relative positions of the pair of mounting members along the insertion direction different.

[0044] Furthermore, the joint of the present invention is characterized in that the inner circumferential surface includes a first surface that is substantially parallel to the insertion direction at one end and a second surface that is located on the other end side of the first surface and narrows from one end side toward the other end side.

[0045] Furthermore, the joint of the present invention is characterized in that the shaft portion is configured to break when a torque and / or axial force exceeding a predetermined level is applied.

[0046] Furthermore, the method for joining members of the present invention is characterized by joining the members to be attached together using the joint of the present invention.

[0047] Furthermore, the present invention provides a method for joining members, comprising a pair of fitting portions provided on each of a pair of opposing mounting members, and a connecting member having a pair of engaging portions that can be fitted into the fitting portions and a bridging portion connecting the pair of engaging portions, wherein the connecting member has a shaft portion that can slide in the direction in which the engaging portions are fitted, and a contact body that can be fixed to the shaft portion, and when the connecting member is placed between the fitting portions, each of the engaging portions is fitted into each of the fitting portions, and the shaft portion slides against the bridging portion, causing the contact body to displace to a point where it contacts the fitting portion, thereby fixing the fitting portion between the engaging portion and the contact body.

[0048] Furthermore, the present invention provides a joint that can be reconfigured among a plurality of types of connecting members, each having an inner circumferential surface that narrows from the opening edge at one end to the other end, and each having a bridging portion of a different length from the others, and after attaching a connecting member for temporary assembly from among the plurality of types of connecting members, the connecting member for temporary assembly is removed and the connecting member for permanent assembly is attached.

[0049] Furthermore, the method for joining members of the present invention is characterized in that the connecting member for temporary assembly has a short bridging portion, and the connecting member for permanent assembly has a long bridging portion.

[0050] Furthermore, the method for joining members of the present invention is characterized in that the connecting member for temporary assembly has a long bridging portion, and the connecting member for permanent assembly has a short bridging portion.

[0051] Furthermore, the method for joining members of the present invention is characterized in that, while the members to be attached are connected by the joint to which the temporary assembly connecting member is attached, a curable fluid is placed between the members to be attached, and when the curable fluid has a hardness of a certain level or higher, the temporary assembly connecting member in the joint is replaced with the permanent assembly connecting member.

[0052] Furthermore, the present invention provides a method for joining members, characterized in that the members to be attached are connected by a plurality of joints, and among the plurality of joints, a joint to which the temporary assembly connecting member is attached and a joint to which the permanent assembly connecting member is attached are arranged so that the permanent assembly connecting member is stretched in the elastic deformation region, a curable fluid is placed between the members to be attached and when the curable fluid has a hardness of a certain level or higher, the temporary assembly connecting member is replaced with the permanent assembly connecting member, and prestress is applied to the curable fluid. [Effects of the Invention]

[0053] According to the present invention, a simple structure can improve workability, including relative positioning when joining mounting members together. [Brief explanation of the drawing]

[0054] [Figure 1] This is a plan view showing a precast floor slab to which the joint according to the first embodiment is applied. [Figure 2] This is a cross-sectional view of a precast floor slab to which the joint according to the first embodiment is applied. [Figure 3] The receiving member of the joint according to the first embodiment is shown, where (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] This is a perspective view showing the connecting member of the joint according to the first embodiment. [Figure 5] This diagram shows the procedure for connecting receiving members using connecting members. [Figure 6] This figure shows the positioning process of a precast floor slab to which the joint according to the first embodiment is applied. [Figure 7] This diagram shows the positioning process performed by separating precast floor slabs. [Figure 8] This diagram shows the positioning when the precast floor slab is misaligned in the Y direction. [Figure 9] This is a cross-sectional view showing the engagement portion in contact with one of the inner circumferential surfaces in the Y direction. [Figure 10]This diagram shows an example of a rotation prevention mechanism between the shaft and the bridge section. [Figure 11] This figure shows other shapes of the inner surface of the housing and the outer surface of the engaging part. [Figure 12] This figure shows an example of the inclination of the inner surface of the housing section. [Figure 13] The joint according to the second embodiment is shown, where (a) is a perspective view and (b) is a side view. [Figure 14] This is a perspective view showing the receiving member of the joint according to the second embodiment. [Figure 15] This diagram shows examples of the shapes of the interlocking parts. [Figure 16] This is a cross-sectional view showing the configuration of other connecting members. [Figure 17] This is a plan view showing the appearance of other connecting members. [Figure 18] This is a plan view showing the appearance of other connecting members. [Figure 19] This is a plan view showing the appearance of other connecting members. [Figure 20] This diagram shows the temporary and final assembled states of the joint. [Figure 21] This diagram shows the procedure for applying prestress by rearranging the connecting members. [Figure 22] This is a cross-sectional view showing the configuration of other joints. [Figure 23] This is a plan view showing other arrangement examples of precast floor slabs. [Figure 24] This is a plan view showing other receiving members. [Figure 25] This figure shows a receiving member composed of multiple sub-parts. [Figure 26] This figure shows a receiving member composed of multiple sub-parts. [Figure 27] This figure shows a receiving member composed of multiple sub-parts. [Figure 28] This figure shows an example of an anchor placement groove for a receiving member. [Figure 29] This diagram shows a joint with a cover member. [Figure 30] This figure shows an example of a method for fixing the lid component. [Figure 31] This is a perspective view showing the configuration of other joints. [Figure 32] The connecting members are shown, with (a) being a perspective view and (b) being a side view. [Figure 33] This is a side view showing the connecting member. [Figure 34] This diagram shows the orientation of the connecting member when the receiving member is shifted in the Y direction. [Figure 35] This diagram shows other configurations of the joint. [Figure 36] This diagram shows the connection of receiving members of different heights. [Figure 37] This diagram shows other configurations of the joint. [Figure 38] This diagram shows other configurations of the joint. [Figure 39] This diagram shows other configurations of the joint. [Modes for carrying out the invention]

[0055] Embodiments 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 mounting members, but here we will describe an example of its application to precast deck slabs used in bridges, roads, or railway track foundations.

[0056] Figure 1 is a plan view showing a precast deck slab 1 to which the joint 10 according to the first embodiment is applied, and Figure 2 is a cross-sectional view of the precast deck slab 1 to which the joint 10 according to the first embodiment is applied, along line AA of Figure 1. The precast deck slab 1 is stretched and fixed over a plurality of main girders (not shown) that are installed side by side in the bridge width direction (Y direction). The precast deck slabs 1 are also arranged adjacent to each other along the bridge axis direction (X direction) as the direction of member connection, and opposing precast deck slabs 1, 1 are connected by the joint 10. After the precast deck slabs 1, 1 are connected by the joint 10, a curable fluid such as grout material, ready-mixed concrete, water glass, or a thermosetting or thermoplastic synthetic resin in a fluid state may be injected between them to seal the joint.

[0057] The joint 10 has a connecting member 20, receiving members 30 and 30a, and is constructed by connecting the receiving members 30 and 30a with 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 substantially H-shaped joint cross-section and has a pair of engaging parts 22, a bridging part 24 connecting the pair of engaging parts 22, a shaft part 26 inserted through the bridging part 24, and a pressing body (contact body) 28 supported on the shaft part 26 so as to be able to rotate integrally with it.

[0058] The engaging portion 22 is a member that extends in a direction perpendicular to the XY plane, has a tapered outer surface, and is fixed to the bridging portion 24, forming a roughly square pyramidal shape that gradually narrows from the base end (upper end) to the tip (lower end). Specifically, of the outer surfaces of the engaging portion 22, the outer surface facing the X direction is inclined roughly symmetrically from the upper end to the lower end so as to narrow the gap in the X direction, and the outer surface facing the Y direction is inclined roughly symmetrically from the upper end to the lower end so as to narrow the gap in the Y direction.

[0059] The bridging portion 24 is formed in a narrow shape, with a shorter length in the Y direction than the engaging portion 22. The bridging portion 24 has a through hole in the center of the XY plane that extends in a direction perpendicular to the XY plane, into which the shaft portion 26 is inserted. The shaft portion 26 has a male threaded portion 26a at one end, which has a right-hand threaded male screw groove. The shaft portion 26 also has a head portion 26b at the other end, which has an outer circumference larger than the through hole of the bridging portion 24 and has a hexagonal hole formed on its top surface. The head portion 26b has a seating surface that can abut against the bridging portion 24.

[0060] The pressing body 28 has a roughly 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 into the male screw portion 26a.

[0061] 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 placed between the receiving members 30, 30a. In other words, the short side portion 28a is set to a length shorter than the distance between the receiving members 30, 30a.

[0062] The longer side portion 28b is set to a length that interferes with the receiving members 30, 30a when the connecting member 20 is placed between the receiving members 30, 30a. In other words, the longer side portion 28b is set to a length that exceeds the distance between the receiving members 30, 30a.

[0063] Figure 4 shows the receiving members 30 and 30a of the joint 10 according to the first embodiment, where (a) is a perspective view, (b) is a cross-sectional view taken from the left side when the end face of the precast floor slab 1 is considered the front side, and (c) is a cross-sectional view taken from the front side. The receiving members (inserted parts) 30 and 30a are each C-shaped joint fittings and are arranged at the ends of a pair of opposing precast floor slabs 1, 1. Parts of the receiving members 30 and 30a are embedded in the ends of each precast floor slab 1, 1 that extend along the Y direction. Therefore, the precast floor slabs 1, 1 are arranged so that the receiving members 30 and 30a face each other along the X direction. In this context, the receiving members 30 and 30a are described as C-shaped joint fittings, but any fitting that has sufficient strength as a joint is acceptable, and the material is not limited to metal.

[0064] The receiving members 30 and 30a have an anchor portion 32 extending in the X direction within the precast floor slab 1, a housing portion 34 having a concave shape 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 stepped portion 38 facing the restricting portion 36 in the Y direction.

[0065] The receiving members 30 and 30a are arranged on the precast floor slab 1 with the opening edge of the housing section 34 facing upward and oriented along the XY plane. However, the opening edge of the housing section 34 is not necessarily limited to being arranged facing upward; the orientation can be set as appropriate, such as facing downward. Furthermore, the receiving members 30 and 30a may be provided so that the housing portion 34 protrudes from the end of the precast floor slab 1, or a part of the housing portion 34 may be embedded in the precast floor slab 1, and the arrangement method can be set as appropriate.

[0066] The housing portion 34 has a notch at the end opposite to 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 engaging portion 22 in the X direction.

[0067] The inner circumferential shape of the housing portion 34 is approximately equivalent to the outer shape of the engaging portion 22, forming a roughly square pyramidal shape that gradually narrows from the opening edge to the bottom. That is, as shown in Figure 4(b), the inner circumferential surfaces 40a and 40b of the housing portion 34 that face each other in the X direction are inclined approximately symmetrically from the opening edge to the bottom towards the center in the X direction. Also, as shown in Figure 4(c), the inner circumferential surfaces 40c and 40d that face each other in the Y direction are inclined approximately symmetrically from the opening edge to the bottom towards the center in the Y direction.

[0068] The restricting portion 36 is formed approximately directly below the housing portion 34 and in a position where it can contact the long side portion 28b of the pressing body 28. That is, it extends perpendicularly from the lower end surface 34b of the housing portion 34, and when the lip portion 34a side of the housing portion 34 shown in Figure 4(a) is considered the front side, the restricting portion 36 is formed on the lower right side of the housing portion 34. The space defined by the lower end surface 34b and the restricting portion 36 functions as a space into which the long side portion 28b of the pressing body 28 can enter and contact the restricting portion 36.

[0069] Next, the procedure for connecting the precast floor slabs 1 by connecting the receiving members 30 and 30a with the connecting member 20 will be described. The precast floor slabs 1 are arranged with their ends, where the receiving members 30 and 30a are installed, facing each other. The receiving members 30 and 30a are also arranged with a predetermined distance between them so that their respective lip portions 34a face each other.

[0070] The connecting member 20 is fitted into each housing portion 34 along a direction perpendicular to the XY plane, that is, the direction indicated by arrow A in Figure 5(a). As a result, the engaging portions 22 are fitted into the inner circumferential surface of each housing portion 34, and the connecting member 20 is positioned between the receiving members 30 and 30a. Here, the pressing body 28 is positioned so that its 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 and 30a.

[0071] When the engaging portion 22 is fitted into the housing portion 34, the pressing body 28 is positioned so as to be able to enter the space defined by the lower end surface 34b of the housing portion 34 and the restricting portion 36 between the receiving members 30 and 30a. Therefore, when the shaft portion 26 of the pressing body 28 is rotated by approximately 90°, the long side portion 28b of the pressing body 28 is positioned between the receiving members 30 and 30a so as to be able to contact the restricting portion 36.

[0072] Next, as shown in Figure 5(b), when torque in the fastening direction is applied to the hexagonal hole of the head 26b via a tool such as a wrench, the pressing body 28 screwed onto the shaft 26 rotates together with the shaft 26. When the pressing body 28 rotates approximately 90° (a predetermined angle) and its long side portion 28b is oriented parallel to the X direction, the long side portion 28b comes into contact with the restricting portion 36 of each receiving member 30, 30a, thereby restricting further rotation. In this way, after the pressing body 28 rotates a predetermined angle together with the shaft 26, it engages with the restricting portion 36 in the circumferential direction, and its rotation is restricted.

[0073] 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 until it contacts the lower end surface 34b. That is, the pressing body 28, while contacting the regulating portion 36, moves along the axial direction toward the receiving members 30, 30a and the bridging portion 24 as the shaft portion 26 rotates, and contacts the lower end surface 34b.

[0074] When the pressing body 28 comes into contact with the lower end surface 34b as shown in Figure 5(c) and becomes unable to rise, the rotation of the shaft portion 26 in the fastening direction is restricted and fastening is completed. As a result, the receiving members 30 and 30a are connected by the connecting member 20, and the precast floor slab 1 is connected.

[0075] Next, the positioning function of the precast floor slab 1 based on the shapes of the housing portion 34 and the engaging portion 22 will be described. The joint 10 has a positioning function that moves the precast floor slab 1 by fitting the engaging portion 22 into the housing portion 34. Specifically, the engaging portion 22 and the housing portion 34 come into contact with each other at their inclined surfaces, and the outer circumferential surface of the engaging portion 22 presses against the inner circumferential surface of the housing portion 34, thereby moving the precast floor slab 1.

[0076] In connecting precast floor slabs 1, 1, one precast floor slab 1 is fixed in a predetermined position, and the other precast floor slab 1 is moved to position them so that their relative positions fall within a predetermined range (predetermined position). Here, the precast floor slab 1 with the receiving member 30a is fixed, and the precast floor slab 1 with the receiving member 30 is moved.

[0077] When the relative positions of the precast floor slabs 1, 1 are separated in the X direction by more than a predetermined distance, and the connecting member 20 is placed between the receiving members 30, 30a, the engaging portion 22 is locked at an intermediate position within the housing portion 34, as shown in Figure 6(a). That is, both the inner circumferential surface 40a of the housing portion 34 and the outer circumferential surface of the engaging portion 22 are inclined, and the tip of the outer circumferential surface of the engaging portion 22 abuts against an intermediate position on the inner circumferential surface 40a, thereby restricting its insertion into the bottom side of the housing portion 34.

[0078] When the head portion 26b is rotated in the fastening direction, the pressing body 28 gradually moves as described above and is displaced to a position where it contacts the lower end surface 34b. Then, as shown in Figure 6(b), the receiving member 30 and the connecting member 20 are pressed between the head portion 26b and the pressing body 28. Therefore, when the shaft portion 26 is rotated further in the fastening direction, the position of the pressing body 28 is restricted by the lower end surface 34b, so the head portion 26b presses the connecting member 20 toward the pressing body 28.

[0079] Furthermore, since the outer circumferential surface and inner circumferential surface 40a of the engaging portion 22 are in contact with each other at inclined surfaces, the pressing force exerted by the head 26b on the connecting member 20 is transmitted to the inner circumferential surface 40a via the outer circumferential surface of the engaging portion 22 and converted into a force that presses the receiving member 30 in the X direction. Consequently, the receiving member 30 moves toward the receiving member 30a side along the X direction together with the precast floor slab 1, and with this movement, the engaging portion 22 enters the housing portion 34.

[0080] As described above, the receiving member 30 and the precast floor slab 1 on which the receiving member 30 is positioned gradually move along the X direction toward the receiving member 30a (the other precast floor slab 1), and when the engaging portion 22 is fitted into the innermost part of the housing portion 34, the relative position of the receiving member 30 to the receiving member 30a becomes a predetermined position, thereby positioning the precast floor slabs 1, 1.

[0081] By rotating the shaft portion 26 in the fastening direction and fitting the engaging portions 22 of the connecting member 20 into the respective housing portions 34 of the receiving members 30 and 30a, the engaging portions 22 press against the inner circumferential surface of the housing portion 34, thereby positioning the relative positions of the precast floor slabs 1, 1 to a predetermined configuration.

[0082] Although the explanation described an example of positioning and fixing precast floor slabs 1, 1 whose relative positions are separated or misaligned in the X direction from a predetermined distance to a predetermined position, the same method can be used to move precast floor slabs 1 to a predetermined position even if their relative positions are closer together in the X direction than a predetermined position. That is, as shown in Figure 7(a), when the tip of the engaging portion 22 abuts against the other inner circumferential surface 40b of the housing portion 34 at an intermediate position, rotating the head portion 26b in the fastening direction causes 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 are sandwiched between the head portion 26b and the pressing body 28.

[0083] As a result, the receiving member 30 is pressed along the X direction in a direction away from the other precast floor slab 1 side via its inner circumferential surface 40b which is in contact with the outer circumferential surface of the connecting member 20, and the precast floor slab 1 and the receiving member 30 move along the X direction away from the receiving member 30a. In addition, as the receiving member 30 moves, the engaging portion 22 enters the housing 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 housing portion 34, and the relative positions of the precast floor slabs 1, 1 are positioned in a predetermined configuration.

[0084] Furthermore, for example, as shown in Figure 8(a), if the precast floor slabs 1, 1 are offset from each other in the Y direction, when the connecting member 20 is placed between the receiving members 30, 30a, the tip of the engaging portion 22 abuts against the inner circumferential surface 40c of the housing portion 34 and locks in place at an intermediate position. That is, the tip of the engaging portion 22 abuts against an intermediate position on the inner circumferential surface 40c, restricting its insertion into the bottom side of the housing portion 34.

[0085] Here, Figure 9 is a cross-sectional view perpendicular to the XY plane showing the state in which the engaging portion 22 is in contact with the inner circumferential surface 40c. When the engaging portion 22 is in contact with the inner circumferential surface 40c at an intermediate position and the head portion 26b rotates in the fastening direction, the pressing body 28 moves to a position where it contacts the lower end surface 34b, as described above. The receiving member 30 and the connecting member 20 are then pressed between the head portion 26b and the pressing body 28.

[0086] Furthermore, since the outer circumferential surface and the inner circumferential surface 40c of the engaging portion 22 are inclined relative to each other, a portion of the pressing force applied to the receiving member 30 acts as a force in the Y direction via the inner circumferential surface 40c. As a result, the receiving member 30 is pressed in the Y direction.

[0087] Therefore, each time the shaft portion 26 is rotated in the fastening direction, the precast floor slab 1 and the receiving member 30 gradually move in the Y direction, and as a result, the receiving member 30 is displaced to a predetermined position facing the X direction relative to the receiving member 30a.

[0088] Thus, 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 slabs 1 can be moved in the X and / or Y directions together with the receiving members 30 and positioned at a predetermined location. That is, the inner circumferential surface of the housing portion 34 of the receiving member 30 is pressed by the engaging portion 22, and the precast floor slabs 1 can be moved toward a predetermined position together with the receiving members 30 along the X and / or Y directions.

[0089] Furthermore, if the precast floor slabs 1, 1 are misaligned in the height direction perpendicular to the XY direction, the height positions of the precast floor slabs 1, 1 can be aligned by fitting the engaging portion 22 into the housing portion 34 of the receiving members 30, 30a and rotating the shaft portion 26 in the fastening direction. That is, the axial force acting on the shaft portion 26 when it is rotated in the fastening direction is transmitted to the connecting member 20 via the head portion 26b, or to the pressing body 28. The connecting member 20 then presses against the receiving member 30, or the pressing body 28 presses against the lower end surface 34b of the receiving member 30, causing the precast floor slab 1 to move toward a predetermined height position together with the receiving member 30. This makes it possible to connect the precast floor slabs 1, 1 by matching the height positions of the receiving member 30 and the receiving member 30a. Of course, if the relative positions of the precast floor slabs 1, 1 are within a predetermined range, the engaging portion 22 can be fitted into almost the innermost part of the housing portion 34 without performing the positioning work by rotating the shaft portion 26 as described above, thus eliminating the need for positioning work.

[0090] As described above, with the joint 10 of this embodiment, even if the relative positions of the precast floor slabs 1, 1 are significantly misaligned (for example, by several tens of mm) from a predetermined position in the X direction, Y direction, and direction perpendicular to the XY plane (height direction), simply by applying a pressing force to the connecting member 20 to insert it between the receiving parts 30, 30a so that the engaging part 22 fits into the housing part 34 of the receiving parts 30, 30a, the relative positions of the precast floor slabs 1, 1 can be positioned to fall within a predetermined range. This makes the work, including relative positioning when joining the precast floor slabs 1, 1, easier and shortens the work time, thereby improving work efficiency. Furthermore, by simply fastening the receiving portions 30, 30a and the connecting member 20 between the head 26b and the pressing body 28, the head 26b can press the connecting member 20 (or the pressing body 28 can press the receiving portion 30), thereby pressing the receiving portion 30 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 as to fasten the receiving portions 30, 30a and the connecting member 20 between the head portion 26b and the pressing body 28, the relative positions of the precast floor slabs 1, 1 can be positioned within a predetermined range. Furthermore, this series of operations ultimately completes the connection work between the precast floor slabs at the appropriate position, thereby improving work efficiency.

[0091] Furthermore, since the pair of receiving members 30, 30a and the connecting member 20 are fastened by a single shaft portion 26 inserted through the bridging portion 24 and a pressing body 28 disposed on the tip side of the shaft portion 26, the pair of receiving members 30, 30a and the connecting member 20 can be firmly fixed. In addition, the connection between the pair of receiving members 30, 30a can be strengthened. Accordingly, according to the present invention, the workability when connecting the receiving members 30, 30a can be improved.

[0092] Furthermore, since the configuration allows the pair of receiving members 30, 30a and the connecting member 20 to be tightened and fixed simply by rotating a single shaft portion 26 inserted through the center of the bridge portion in the fastening direction, the connecting member 20 maintains a horizontal position while the engaging portion 22 enters and is fixed into the housing portion 34, thus enabling the connecting member 20 and the receiving members 30, 30a to be fixed in an extremely stable manner.

[0093] Furthermore, even if the relative positions of 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 the receiving member 30 move to a predetermined position by fitting them into the engaging portion 22 within the housing portion 34, making positioning easy and further improving work efficiency.

[0094] In addition to the above configuration, a rotation prevention mechanism may be formed in the shaft portion 26 to prevent rotation in the loosening direction due to vibration or the like after fastening. Specifically, head-side irregularities 50 are provided on the seating surface of the head portion 26b as shown in Figure 10, 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 in the circumferential direction. 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, their perpendicular surfaces (the side with the stronger inclination) 50b and 52b come into contact, preventing rotation of the shaft portion 26. Of course, the bridging portion recesses 52 on the bridging portion 24 side that correspond to the head-side recesses 50 provided on the seating surface of the head 26b may be configured as a separate washer-like component from the bridging portion 24.

[0095] By forming such an anti-rotation mechanism, it is possible to prevent the shaft portion 26 from rotating in the loosening direction due to repeated vibrations, and also to prevent the pressing body 28 from coming off and falling due to the rotation of the shaft portion 26 in the loosening direction.

[0096] Furthermore, although the internal space of the housing section 34 and the shape of the engaging section 22 have been described as being configured as a roughly square pyramidal shape, they are not limited to this. For example, the general shape of the engaging section 22 may be a roughly polygonal pyramidal shape such as a roughly triangular pyramidal shape, a roughly pentagonal pyramidal shape, a roughly hexagonal pyramidal shape, or a roughly conical shape as shown in Figure 11. Similarly, the internal space of the housing portion 34 may be a roughly polygonal pyramidal shape such as a roughly triangular pyramidal shape, a roughly pentagonal pyramidal shape, a roughly hexagonal pyramidal shape, or a roughly conical shape corresponding to the conical engaging portion 22, as shown in Figure 11.

[0097] Furthermore, although the inner circumferential surface of the housing portion 34 and the outer circumferential surface of the engaging portion 22 have been described as having symmetrically inclined surfaces facing each other in the X or Y direction, they are of course not limited to this and may have asymmetrical inclinations, or one of the opposing surfaces may be inclined while the other is not.

[0098] For example, of the inner circumferential surfaces 40a and 40b of the housing portion 34, one inner circumferential surface 40a may not be inclined, as shown in Figure 12(a), while only the other inner circumferential surface 40b may be inclined. Alternatively, as shown in Figure 12(b), only one inner circumferential surface 40a may be inclined, or as shown in Figure 12(c) or Figure 12(d), the inner circumferential surfaces 40a and 40b may be inclined in the same direction but with different inclination angles. Of course, the inclination of the outer circumferential surface of the engaging portion 22 may be set in the same manner as described above.

[0099] Furthermore, although the head portion 26b is given a hexagonal hole on its top surface, it is not limited to this, and may have a cross-shaped hole, a slotted hole, a rectangular hole, a star-shaped hole, etc. Alternatively, instead of providing a hole on the top surface, the external shape may be a roughly square shape, a roughly hexagonal shape, or other irregular shape.

[0100] Furthermore, the precast floor slabs 1, 1 connected by the joint 10 are not limited to being spaced apart and facing each other, but may also be placed in contact with each other so that there are virtually no joints between the precast floor slabs 1, 1. In that case, as shown in Figure 23, 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).

[0101] Next, a joint according to the second embodiment will be described. Figure 13 shows a joint 60 according to the second embodiment, where (a) is a perspective view and (b) is a side view. In the following description, the same reference numerals are used for components that are the same as those in the joint 10 of the first embodiment, and their descriptions are omitted. Also, the anchor portion 32 is not necessarily required in each figure and will be omitted here.

[0102] The joint 60 differs from the joint 10 of the first embodiment in that it has a recessed engagement portion 62 that directly engages the receiving members 30, 30a with each other in the insertion direction. The recessed engagement portion 62 protrudes outward from the lip portion 34a along the X direction, and a plurality of recesses are formed on its end face, arranged along the vertical direction.

[0103] The interlocking portion 62 has protrusions and recesses that interlock and engage with each other when the relative positions of the receiving members 30 and 30a are in a predetermined position. That is, as shown in Figure 14, the interlocking portion 62 has protrusions and recesses 62a formed on one lip portion 34a in the Y direction and protrusions and recesses 62b formed on the other lip portion 34a in the Y direction. The protrusions and recesses 62a and 62b are formed so that when they are positioned opposite each other, the protrusions fit into the recesses of the other side, and the positions of the protrusions and recesses of each are staggered along the insertion direction.

[0104] The joint 60 is constructed by connecting the receiving members 30 and 30a via the connecting member 20, similar to the first embodiment described above. That is, similar to the first embodiment, the connecting member 20 is first placed between the receiving members 30 and 30a, and torque in the fastening direction is applied to the shaft portion 26.

[0105] As the pressing body 28, which is screwed 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 surface 34b of the receiving members 30, 30a.

[0106] As a result, the receiving members 30, 30a and the connecting member 20 are fastened together. Furthermore, if the relative positions of the precast floor slabs 1, 1 are separated from a predetermined position, the engaging portion 22 will fit into the housing portion 34, thereby moving the precast floor slab 1 and the receiving member 30 to the predetermined position and positioning them. When the precast floor slab 1 and the receiving member 30 are moved to the predetermined position, the protrusions and recesses of the protrusion and recess engagement portion 62 interlock with each other, and the receiving members 30, 30a engage in the insertion direction.

[0107] In this way, by forming the interlocking portion 62, the joint strength of the precast floor slabs 1, 1 against external forces along the insertion direction, i.e., the direction perpendicular to the XY plane, is improved, and the strength of the joint 60 itself can be improved.

[0108] The shape of the protrusions and recesses of the protrusions and recesses engaging portion 62 is not particularly limited, and can be set as appropriate, for example, a roughly triangular shape as shown in Figure 15(a), a roughly wave-like shape as shown in Figure 15(b), a protrusion and recess shape as shown in Figure 15(c) where the interlocking sides of the protrusions and recesses (contact surfaces between the protrusions and recesses) are parallel to the X direction, or a pointed shape as shown in Figure 15(d) where the contact surfaces between the protrusions and recesses are parallel to the X direction from the base to the middle portion. However, if the vertical positions of the receiving members 30 are not aligned, it is preferable to set the shape so that the opening of the recess is wide and the tip of the protrusion is narrowed in order to make it easier for the protrusion to enter the recess.

[0109] Furthermore, although the above-described embodiments have been explained assuming that the head 26b of the shaft portion 26 abuts against the bridging portion 24, the invention is of course not limited to this, and the shaft portion 26 may be arranged in a direction in which the head 26b abuts against the lower end surface 34b of the housing portion 34. That is, the shaft portion 26 may be inserted into the bridging portion 24 in an inverted direction. In that case, the head 26b is formed to have a substantially rectangular shape with a short side portion 28a and a long side portion 28b, so as to correspond to the shape of the pressing body 28. In this way, the head 26b abuts against the restricting portion 36, restricting rotation in the fastening direction, and by screwing the pressing body 28 onto the shaft portion 26 on the bridging 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. 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.

[0110] Furthermore, when the shaft portion 26 is inserted upside down, the head portion 26b does not necessarily have to be shaped to contact the restricting portion 36, as long as it is shaped to contact the lower end surface 34b. In that case, for example, a groove such as a Phillips head or slot for a tool to engage is formed at the tip of the shaft portion 26. Then, the female threaded body screwed onto the shaft portion 26 is fixed in contact with the bridging portion 24, and the shaft portion 26 is rotated in the fastening direction via a tool or the like to fasten the receiving members 30, 30a and the connecting member 20.

[0111] Furthermore, although the example described was the case in which the pressing body 28 is screwed onto the male threaded portion 26a of the shaft portion 26, it is of course not limited to this, and the shaft portion 26 and the pressing body 28 may be integrated. In this case, it is preferable that the pressing body 28 be rotatable by a predetermined angle together with the shaft portion 26, and that the pressing body 28 be displaceable in the axial direction.

[0112] For example, as shown in Figure 16(a), the shaft portion 26 is slidably inserted into the insertion hole of the bridging portion 24, and a biasing member 70 is provided that biases the end face of the head portion 26b so that it is axially separated from the bridging portion 24. This allows the pressing body 28 to rotate together with the shaft portion 26 in a position where it does not interfere with the stepped portion 38, and to contact 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 shaft portion 26 is biased by the biasing member 70, the pressing body 28 contacts the lower end surface 34b as shown in Figure 16(b).

[0113] Furthermore, although the connecting member 20 has been described using an example configuration in which one engaging portion 22 is provided on each side in the X direction, that is, one engaging portion 22 is provided on each side of the bridging portion 24 as the boundary, the number of engaging portions 22 is not limited, and multiple engaging portions may be provided on each side of the bridging portion 24 as the boundary. For example, as shown in Figure 17(a), one engaging portion 22 may be provided on one end in the X direction, and two engaging portions 22 may be provided on the other end. The engaging portions 22 may also be formed radially around the shaft portion 26, as shown in Figure 17(b).

[0114] Furthermore, the engaging portions 22 may be arranged in multiple pairs with respect to the bridging portion 24 as the boundary. For example, as shown in Figures 18(a) and (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.

[0115] Furthermore, the distance from the shaft portion 26 to the engaging portion 22 may be set to be equidistant on both sides in the X direction, but it goes without saying that it may also be set to different distances as shown in Figure 19.

[0116] Furthermore, although the above embodiment was described as having the engaging portion 22 in close contact with the inner circumference of the housing portion 34, the inner circumferential space of the housing portion 34 may be set to be larger than the engaging portion 22, as long as the engaging portion 22 can engage within the housing portion 34. In this case, a gap will be created between the inner circumferential surfaces 40a to 40d of the housing portion 34 and the engaging portion 22, so that the relative positions of the mounting targets of the receiving member can be positioned within a predetermined range.

[0117] Furthermore, during the positioning process, the distance between the receiving members 30 and 30a is determined by the position of the engaging portion 22 that enters the housing portion 34. This can be used to apply a compressive force, which could be called post-stress rather than pre-stress, to the curable fluid injected between the precast floor slabs 1 and 1. Specifically, the precast floor slabs 1 and 1 are initially spaced apart from a predetermined position, and the engaging portion 22 of the connecting member 20 is not inserted all the way to the innermost part of the housing portion 34. The state in which the engaging portion 22 of the connecting member 20 is inserted all the way to the innermost part is defined as the final assembly state. The curable fluid is injected between the precast floor slabs 1 and 1 while they are in the temporary assembly state. After the fluid has hardened to a certain level of hardness, the assembly is moved to the final assembly state, at which point the engaging portion 22 of the connecting member 20 presses against the inner circumferential surface 40a, as shown in Figure 20, applying a compressive force to the curable fluid between the precast floor slabs 1 and 1. Of course, it goes without saying that a state in which precast floor slabs 1, 1 are closer together than their designated positions can also be considered a temporary assembly state.

[0118] Furthermore, in the present invention, since the distance between the receiving members 30 and 30a is determined by the length of the bridged portion in the X direction, it is possible to apply prestress to the hardening fluid injected into the gap (joint space) between the connected precast floor slabs 1 and 1 by switching between multiple connecting members with different lengths of bridged portions.

[0119] Specifically, a short connecting member (referred to as the short connecting member 82) and a long connecting member for the main assembly (referred to as the 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 in the X direction of the long bridging portion 82a is set such 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 stretch in its elastic deformation range.

[0120] The precast floor slabs 1, 1 are connected to each other by multiple joints 10. Here, Figure 21 shows the procedure for applying prestress by rearranging the connecting members, and the precast floor slabs 1, 1 shown in Figure 21(a) are connected by three joints 10. That is, each precast floor slab 1 has three receiving members 30 (or receiving members 30a) arranged in parallel at approximately equal intervals along the Y direction. The precast floor slabs 1, 1 are positioned by connecting the receiving members 30, 30a using short connecting members 82.

[0121] Next, the short connecting members 82 are removed from the joints 10 located at both ends in the Y direction, and replaced with the long connecting members 80. As a result, the short connecting member 82 of the joint 10 located in the middle of the Y direction, as shown in Figure 21(b), is subjected to tensile force in the X direction and stretched in the elastic deformation range, which is considered the temporary assembly state.

[0122] In this temporary assembly state, a hardening fluid is injected into the gap between the precast floor slabs 1, 1. In order to prevent the hardening fluid from adhering to the long connecting members 80, anti-adhesion members such as coverings or plates may be placed around the long connecting members 80 in advance.

[0123] Then, after the curable fluid hardens to a certain level of hardness 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 the short connecting members 82 to complete the assembly. As a result, within the hardened body, a force acts to return the short connecting members 82, which were stretched beforehand during the replacement, to their original length, applying compressive force and prestress to the hardened body. This reinforces the hardened body.

[0124] 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; they may be connected with two joints 10, or with four or more joints. Furthermore, the short connecting members 82 may be used for temporary assembly, and the long connecting members 80 for permanent assembly.

[0125] Alternatively, the precast floor slabs 1, 1 may be connected by multiple joints 10 and cotter joints of other structures. As long as the precast floor slabs 1, 1 can be positioned relative to each other by the joints 10, the number and arrangement of the joints 10 and cotter joints can 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 floor slab 1 in the Y direction with cotter joints placed between the joints 10, or the joints 10 may be positioned in the center with cotter joints on both sides thereof.

[0126] Furthermore, in each of the embodiments described above, the connecting member 20 was pressed by the axial force generated by rotating the shaft portion 26 in the fastening direction so that the engaging portion 22 would fit into the housing portion 34. However, of course, the shaft portion 26 may be omitted from the connecting member 20, and the connecting member 20 may be directly pressed by a tool such as a hammer.

[0127] Furthermore, in each of the embodiments described above, the through-hole formed in the bridging portion 24 is not limited to a through-hole, as long as it is a hole into which the shaft portion 26 can be inserted. For example, as shown in Figure 22(a), a non-through-hole 86 may be drilled in the lower end surface of the bridging portion 24. In that case, the male threaded pin 88, which serves as the shaft portion, is inserted into the through-hole 86 from the lower side of the bridging portion 24 and fixed in place. Specifically, a female threaded groove is provided on the inner circumferential surface of the through-hole 86, and the male threaded pin 88 is further provided with a male threaded portion 88a having a male threaded groove that screws into the female threaded groove, and a head 88b provided at the base end of the male threaded portion 88a. Then, as shown in Figure 22(b), the male threaded pin 88 is screwed into the through-hole 86, and the head 88b is brought into contact with the lower end surface 34b to fasten the connecting member 20 and the receiving members 30, 30a, thereby forming a joint.

[0128] Furthermore, the shape of the receiving members 30 and 30a is not particularly limited. For example, as shown in Figure 24, the outer shape in plan view may be roughly wedge-shaped. That is, the width a1 on one end in the X direction where the lip portion 34a and inner circumferential surface 40a are provided may be narrower than the width a2 on the other end in the X direction (inner circumferential surface 40b side). If such wedge-shaped receiving members 30 and 30a are adopted, the tensile resistance to tension in the X direction between the receiving members and the precast floor slab will be improved. Consequently, the receiving members 30 and 30a and the precast floor slab will be fixed even more firmly.

[0129] Furthermore, the anchor portion 32 provided on the receiving members 30 and 30a may be provided integrally with the receiving members 30 and 30a, or it may be a separate component. The shape of the separate anchor portion 32 is not particularly limited, and the material and shape can be set as appropriate, such as deformed steel bars, threaded reinforcing bars, round bars, U-shaped reinforcing bars, or plate-shaped components. Of course, even when the anchor portion 32 is an integrated unit, its shape is not particularly limited.

[0130] When a separate anchor portion 32 is installed on the receiving members 30 and 30a, it is preferable to provide an anchor installation groove in the receiving members 30 and 30a and fit the anchor portion 32 into it for fixation. Of course, other fixing means such as welding, brazing, or adhesive may be applied between the anchor portion 32 and the receiving members 30 and 30a. Alternatively, the anchor portion 32 may be fixed by making the insertion end of the anchor portion 32 into a male thread shape and the inner circumferential surface of the anchor installation groove in the receiving members 30 and 30a into a female thread shape, thereby screwing the anchor portion 32 into the receiving members 30 and 30a.

[0131] Furthermore, the receiving members 30 and 30a may be composed of multiple separate parts, with the anchor portion 32 sandwiched and fixed between these parts. For example, as shown in Figure 25, the receiving member 30 is composed of two separate parts 100 and 102. While the receiving member 30 is described here, it goes without saying that the receiving member 30a can be configured in a similar manner. The receiving member 30 has an anchor placement groove 104 in the center of the face opposite the lip portion 34a in the X direction.

[0132] Each of the parts 100 and 102 has a connecting surface 106 that is perpendicular to the XY plane and parallel to the X direction, and the parts are joined together with the connecting surface 106 as the mating surface. In addition, recesses and / or inner circumferential surfaces of grooves constituting the anchor placement groove 104 are formed on the respective engaging surface 106 of the parts 100 and 102. Thus, the anchor placement groove 104 is formed by the joining of multiple parts 100 and 102.

[0133] The parts 100 and 102 are joined by bolt fastening. Therefore, through holes (not shown) formed in each of the parts 100 and 102 that penetrate in the Y direction are connected, and bolts are inserted through these connecting through holes and nuts are fastened to the bolts to join the parts 100 and 102.

[0134] Furthermore, the means of joining the parts 100 and 102 are not limited to bolt fastening, but may also be crimping or riveting. Adhesion, welding, fitting, or a combination thereof may also be used. Furthermore, the bonding surface 106 is not limited to a substantially flat shape, but may be any shape, such as a substantially uneven surface as shown in Figure 26(a), a substantially mountain-shaped shape with mountain-like irregularities as shown in Figure 26(b), or a substantially wave-shaped shape with curved irregularities as shown in Figure 26(c).

[0135] If irregularities are formed on the joint surface 106, the frictional force and / or fitting force between the joint surfaces 106 will increase when the irregularities are fitted together, thereby preventing the parts 100 and 102 from sliding or shifting along the direction perpendicular to the XY plane. In addition, the irregularities on each joint surface 106 can be fitted together before joining the parts 100 and 102, making alignment easier.

[0136] Furthermore, the joint surface 106 may be formed with minute irregularities such as knurling or a rough surface, which also increases the frictional force and / or fitting force between the joint surfaces 106, thereby preventing the parts 100 and 102 from sliding or shifting along the direction perpendicular to the XY plane. Alternatively, one or more recesses may be provided on the joint surface 106 of the sub-part 100, and one or more protrusions may be provided on the joint surface 106 of the sub-part 102, and the protrusions may be fitted into the recesses to perform alignment. Furthermore, the joint surface 106 may have a surface shape in which part is flat and the other part is a surface with minute irregularities or an irregularity as shown in Figures 26(a) to (c), etc.

[0137] Furthermore, the position of the coupling surface 106 in the receiving member 30 is approximately the center position in the Y direction, as shown in Figure 25. It is not limited to this, and as shown in Figure 27(a), it may also be located along one end face in the Y direction of the anchor placement groove 104. Furthermore, as shown in Figure 27(b), the connecting surface 106 may be set to form a plane parallel to the XY plane.

[0138] Furthermore, the internal shape of the anchor placement groove 104 can be set as appropriate, but it is preferable that it be shaped to accommodate the anchor portion 32. That is, if the anchor portion 32 is a so-called deformed steel bar having protrusions such as knots or ribs on its outer surface, a recess is provided on the inner surface of the anchor placement groove 104 to engage with the protrusions of the anchor portion 32, as shown in Figure 28(a). If the anchor portion 32 is a U-shaped reinforcing bar, the anchor placement groove 104 is formed in a U shape, as shown in Figure 28(b). If the insertion end of the anchor portion 32 is widened, the opening of the anchor placement groove 104 is formed to widen from the opening edge toward the back in the X direction, as shown in Figure 28(c). In this way, when the receiving member 30 is composed of parts 100 and 102, the shape of the anchor placement groove 104 can be set as appropriate.

[0139] Furthermore, the number of anchor portions 32 provided on the receiving member 30 is not limited to one, but may be multiple. In that case, multiple anchor placement grooves 104 are formed according to the number of anchor portions 32.

[0140] Furthermore, although it has been described that the anchor placement groove 104 is composed of multiple sub-parts 100 and 102, it is not limited to this, and for example, the anchor placement groove 104 may be provided in a single sub-part 100. Of course, if there are multiple anchor sections 32, the anchor placement groove 104 may be provided for each sub-part 100 and 102. Furthermore, although the housing portion 34 was described as having a concave shape in each of the embodiments described above, it is of course possible to have a hole shape that penetrates the receiving members 30 and 30a.

[0141] Furthermore, although the connecting member 20 and the receiving members 30 and 30a are fixed by fastening the shaft portion 26, a separate member may be provided to press the engaging portion 22 within the receiving members 30 and 30a toward the bottom side of the housing portion 34 in order to further secure the connecting member 20 and the receiving members 30 and 30a. For example, a lid member may be provided as a separate member that fits into the opening of the housing portion 34. As shown in Figure 29, the lid member 120 is roughly shaped to fit into the opening edge (installation portion) of the housing portion 34, and one end in the insertion direction protrudes into the housing portion 34 so as to be able to press the engaging portion 22. By fitting the lid member 120 to the opening edge of the housing portion 34 in this way, the housing portion 34 can be closed while the engaging portion 22 can be held down.

[0142] To more firmly secure the lid member 120 to the housing 34, the lid member 120 and the housing 34 may be fastened together. That is, a male thread region may be formed on the outer circumferential surface of the lid member 120, and a female thread region may be formed on the inner circumferential surface of the housing 34 on the opening edge side, and the lid member 120 may be screwed into the housing 34 for fixation.

[0143] For example, as shown in Figure 30(a), the housing portion 34 has a female thread region 130 formed at its open end (upper end), which has a circular inner circumference and a female thread spiral groove on its circumferential surface. The female thread region 130 has a hole shape that is larger in diameter than the area in the housing portion 34 into which the engaging portion 22 fits, so as not to interfere with the engaging portion 22 that is fitted into the housing portion 34.

[0144] On the other hand, the male thread region of the lid member 120 has a cylindrical male thread region 122 and a projection 124 that protrudes in the axial direction. The male thread region 122 has a male thread spiral groove on its outer circumference that screws into the female thread spiral groove of the female thread region 130. The projection 124 is positioned closer to the tip than the male thread region 122 and protrudes in the axial direction. Therefore, as shown in Figure 30(b), by fastening the male threaded region 122 to the female threaded region 130, the projection 124 comes into contact with the engaging portion 22, so that the lid member 120 can close the housing portion 34 while applying a downward pressing force to the engaging portion 22. The lengths of the male threaded region 122 and the female threaded region 130 can be set as appropriate.

[0145] The protruding length of the projection 124 is not particularly limited, but if the projection 124 is set to compress the engaging portion 22 when the lid member 120 is fastened and fixed to the housing portion 34, it is possible to control the pressing force applied to the engaging portion 22 by tightening the lid member 120. Furthermore, although the lid member 120 and the housing section 34 were fastened and fixed in the above description, other fastening means such as adhesive, welding, or brazing may also be used. Furthermore, a sealing member may be provided on the lid member 120 so that the lid member 120 can be fitted to the housing 34 in a watertight or liquidtight manner.

[0146] Figure 31 is a perspective view showing the configuration of another joint, where the joint 200 comprises receiving members 210, 210a having a substantially conical receiving portion 212, and a connecting member 220 having a substantially conical engaging portion 222. The receiving members 210, 210a have protruding and recessed engaging portions 214, 214a that protrude outward along the X direction, and the protruding and recessed engaging portions 214, 214a have protrusions that interlock with each other to engage in the Z direction. Therefore, when the protruding and recessed engaging portions 214, 214a of the receiving members 210, 210a interlock and engage, their relative positions become predetermined. The receiving portion 212 has an opening at the top, and a female screw thread groove for installing a cover member 230 is provided on the inner circumferential surface near the opening. That is, the shape of the inner circumferential surface of the receiving portion 212 is set so that a cover member 230 having a male screw thread groove on its outer circumferential surface can be screwed in and fixed.

[0147] Furthermore, in the receiving members 210 and 210a, the notches 216 into which the bridging portion 220 can be fitted are shaped to widen in a V-shape along the X direction. That is, they are formed to gradually widen outward in the X direction from the housing portion 212 side.

[0148] Figure 32 shows the connecting member 220, where (a) is a perspective view and (b) is a side view. The connecting member 220 consists of a pair of engaging portions 222 connected by a bridging portion 224. Here, the bridging portion 224 has a shape in which the base that connects to the engaging portion 222 is widened in a V-shape to correspond to the shape of the notch 216. That is, the bridging portion 224 has a shape in which the width along the Y direction gradually widens from the base side (engaging portion 222 side) toward the center.

[0149] Furthermore, at least one pair of connecting-side locking portions 224a protruding in the Z direction are formed on the lower end surface of the connecting member 220. The connecting-side locking portions 224a are positioned opposite the shaft portion 26 on the X direction side, and here they are positioned on both sides in the X direction, sandwiching the shaft portion 26. The connecting-side locking portions 224a function as part of the rotation prevention mechanism of the pressing body 226, which will be described later.

[0150] A shaft portion 26 is inserted through a central through-hole in the bridging portion 224, and a pressing body 226 is positioned on the male threaded portion 26a formed on the shaft portion 26. The pressing body 226 has a main body portion that is roughly rectangular in plan view, having a short side portion and a long side portion, and a pressing body-side locking portion 226a, which is an oval or rectangular cylindrical projection in plan view, 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 male threaded portion 26a and through which the shaft portion 26 can be inserted. The width of the pressing body-side locking portion 226a is set such that the long side portion in plan view is parallel to the long side portion of the pressing body 226 and is longer than the distance between the pair of connecting portion-side locking portions 224a, and the short side portion can be positioned between the pair of connecting portion-side locking portions 224a. Therefore, the short side portion of the pressing body-side locking portion 226a is positioned between the connecting portion-side locking portions 224a, thereby forming a mechanism to prevent the pressing body 226 from rotating. That is, when the pressing body 226 rotates from a state where the pressing body-side locking portion 226a is positioned between the connecting portion-side locking portions 224a, the long side portion of the pressing body-side locking portion 226a is longer than the distance between the connecting portion-side locking portions 224a, so the pressing body-side locking portion 226a comes into contact with the connecting portion-side locking portion 224a and locks in the circumferential direction. As a result, it functions to prevent the pressing body 226 from rotating.

[0151] With the joint 200 configured as described above, when the connecting member 220 is installed on the receiving members 210 and 210a while the head 26b is grasped, the pressing body 226 can be prevented from rotating from a predetermined state. Specifically, when the pressing body 226 shown in Figure 33 is positioned with its short side parallel to the X direction, and the connecting member 220 is lifted by grasping the head 26b, the shaft portion 26 is lifted relative to the bridging portion 224, and the pressing body side locking portion 226a contacts the lower end surface of the bridging portion 224a between the pair of connecting side locking portions 224a. At this time, even if an external force that could cause the pressing body 226 to rotate relative to the shaft portion 26 is applied, the pressing body side locking portion 226a contacts 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 and 210a while inserting the engaging portion 222 into the housing portion 212 while pinching the head portion 26b. Of course, in this configuration, 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 the configuration is not limited to this, and a locking portion that can be locked to the connecting member 220 may also be provided on the pressing body 226 side, for example, on the upper surface of the pressing body 226.

[0152] Furthermore, by using the joint 200, the range of misalignment between receiving members along the Y direction that can be aligned can be expanded compared to the case where the square pyramidal engaging portion 22 described above is fitted into the housing portion 34. Specifically, as shown in Figure 34, the engaging portion 222 can be accommodated in the housing portion 212 even if the connecting member 220 is tilted with respect to the X and Y axes on the XY plane. Therefore, it is possible to accommodate a wider range of misalignment along the Y direction.

[0153] Furthermore, by shaping the notch 216 and the base of the bridging portion 224 in a V-shape, the engagement strength between the conical housing portion 212 and the engaging portion 222 along the X direction can be improved. Furthermore, since the interlocking parts 214 and 214a are located on both sides of the notch 216 in the Y direction, misalignment of the receiving members 210 and 210a in the Y direction narrows the gap between the interlocking parts 214 and 214a for the pressing body 226 to pass through along the Y direction. Therefore, the installation position and width along the Y direction of the interlocking parts 214 and 214a are set so as to ensure that a gap is secured for the pressing body 226 to pass through, even if the receiving members 210 and 210a are misaligned in the Y direction.

[0154] Furthermore, the screw-fitting structure between the lid member and the housing is not limited to the above. For example, a screw-fitting structure may be formed by creating a male screw thread groove on the housing side and a female screw thread groove on the lid member side. That is, a substantially cylindrical tube portion surrounding the opening of the housing portion may be provided on the upper surface of the engaging portion, with a male screw thread groove formed on the outer surface of the tube portion, while the lid member has a concave cross-section and a female screw thread groove formed on its inner surface. The female screw thread groove of the lid member may be screwed into the male screw thread groove of the tube portion, thereby closing the opening at the top of the housing portion with the lid member.

[0155] Furthermore, although it has been explained that the precast floor slab 1 is moved by the engagement portion 22 and the housing portion 34 contacting each other's inclined surfaces and the outer circumferential surface of the engagement portion 22 pressing against the inner circumferential surface of the housing portion 34, the precast floor slab 1 can be moved if at least one of the outer circumferential surface of the engagement portion 22 or the inner circumferential surface of the housing portion 34 is an inclined surface. For example, as shown in Figure 38(a), the outer circumferential surface of the engagement portion 22 has 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) contacts or presses against the vertical surface 400. Furthermore, as shown in Figure 38(b), the engaging portion 22 may have an inclined outer surface, and the housing portion 34 may have a vertical surface 410 (non-inclined surface) on the inner surface on the opening side, allowing the precast floor slab 1 to move when the inclined outer surface of the engaging portion 22 and the vertical surface 410 of the housing portion 34 come into contact or are pressed against each other. Note that since the vertical surfaces 400 and 410 come into contact with the inclined surface from the corners, they may be chamfered to create corners or rounded surfaces to avoid damaging the inclined surface.

[0156] Furthermore, the shaft portion 26 may be configured to break when a torque and / or axial force exceeding a predetermined level is applied, and to separate and fall together with the pressing body that is screwed onto the male threaded portion 26a. For example, a weak portion 310 (see Figure 35) is provided on the circumferential surface of the male threaded portion 26a of the shaft portion 26, with a V-groove engraved in the circumferential direction. When a torque exceeding a predetermined level is applied to the shaft portion 26, if the shaft portion 26 breaks at the weak portion 310, it becomes possible to remove the male threaded portion 26a extending below the bridging portion 24. The engraving for providing the weak portion 310 can be done by appropriate methods such as cutting or plastic deformation, and the method is not limited to this. In addition, a hole may be formed in the male threaded portion 26a that is separated by breakage, or a suspension device may be provided, and a string, chain, wire, etc. may be connected to the hole or suspension device. By connecting a string, chain, wire, etc. to the male threaded portion 26a in this way, the separated and fallen male threaded portion 26a and the pressing body 28 that is screwed onto it can be easily pulled up and recovered. Alternatively, instead of the male screw portion 26a, a hole or suspension device may be provided on the pressing body 28 side to which a string, chain, wire, etc. can be connected. This also allows the male screw portion 26a and the pressing body 28 to be easily pulled up and recovered after they have fallen.

[0157] Furthermore, although the connecting member 20 and the receiving members 30 and 30a were fixed by fastening the shaft portion 26 and the pressing body 28, the engaging portion 22 and the receiving member 30 (30a) may also be fixed using a bolt. For example, a through hole 240 (see Figure 35) parallel to the axial direction may be drilled in the engaging portion 22, and a female screw hole (see Figure 35) may be provided at the bottom of the housing portion 34. Then, the engaging portion 22 may be fixed to the receiving member 30 (30a) by inserting a bolt 250 (see Figure 35) through the through hole 240 in the engaging portion 22 and screwing it into the female screw hole 260.

[0158] Figure 35 shows the configuration of another joint, where (a) is a plan view, (b) is a cross-sectional view along line AA, and (c) is a cross-sectional view along line BB. The engaging portion 22 is provided with a through hole 240, which is formed by drilling a hole approximately in the center of the engaging portion 22. The through hole 240 is also provided along the direction in which the engaging portion 22 is fitted into the housing portion 34. The receiving members 30 and 30a have female screw holes 260 at their bottoms. Furthermore, a bolt 250 is provided to fix the engaging portion 22 to the receiving members 30, 30a. The bolt 250 can be inserted through the through hole 240 and screwed into the female threaded hole 260, and has a shaft portion 252 with a male threaded portion 250a formed at one end, and a head portion 254 with a hexagonal outer shape. The head portion 254 has an outer shape in which the length (width) in the direction perpendicular to the axis is larger than that of the shaft portion 252.

[0159] The bolt 250 is tightened after the engaging portion 22 is fitted into the housing portion 34. Specifically, the engaging portion 22 is first fitted into the housing portion 34. Then, the bolt 250 is inserted through 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.

[0160] Furthermore, the inner circumferential surface of the housing portion 34 may include a vertical surface 300 extending approximately vertically between the opening edge and the bottom, as shown in Figure 35(b), as long as the cross-sectional shape is approximately bowl-shaped, approximately conical, approximately frustoconical, etc., and includes at least a tapered surface that gradually narrows from the opening edge toward the innermost part. That is, the opening edge may have an inclination to guide the engagement portion 22 into place, and the inner circumferential surface may have a vertical surface (first surface) 300 approximately parallel to the direction of insertion of the engagement portion 22 from the inclination, and a tapered surface (second surface) 302 that gradually narrows toward the bottom from the vertical surface 300. In that case, the outer circumferential shape of the engagement portion 22 may be a shape that conforms to the inner circumferential shape of the housing portion 34. That is, when housed in the housing portion 34, the engaging portion 22 may have an outer circumferential surface that includes a vertical surface 22a that can substantially slide in contact with the vertical surface 300 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.

[0161] Furthermore, although the above-described embodiment was explained as being able to align the height positions even if the precast floor slabs 1, 1 are offset from each other in the height direction, it is also possible to fix the floor slabs together using the joint 10 when the precast floor slabs 1, 1 are offset from each other by a predetermined amount in the height direction. In that case, a spacer (intervening part) 270 is interposed in the deeper part in the depth direction into which the engaging part 22 is fitted in the receiving part 30, 30a of the receiving part 30, 30a that has a lower set height, and the engaging part 22 is fitted in.

[0162] Here, Figure 36 shows the connection of receiving members 30 and 30a of different heights, where (a) is a cross-sectional view showing receiving members 30 and 30a at different height positions, and (b) is a cross-sectional view showing receiving members 30 and 30a fixed by a joint. The spacer 270 is a washer-shaped member that forms a substantially annular shape and has a hole in the center through which a bolt 250 can be inserted. The spacer 270 also restricts the depth to which the engaging portion 22 can be fitted, positioning the engaging portion 22 within the housing portion 34 at a position shallower by a depth h from the innermost part. That is, the spacer 270 abuts against the engaging portion 22 within the housing portion 34, restricting the movement of the engaging portion 22 in the fitting direction.

[0163] Specifically, when opposing precast floor slabs (not shown) are positioned at different heights, and the receiving member 30 is set to be higher than the receiving member 30a by the length h shown in Figure 36(a), a spacer 270 with a thickness matching the height difference (length h) between the receiving members 30 and 30a is placed before the connecting member 20 is installed. When the connecting member 20 is installed, a torque in the fastening direction is applied to the shaft portion 26 inserted through the bridging portion 24. As a result, as shown in Figure 36(b), the pressing body 28 comes into contact with the lower end surface of the receiving member 30a, and the shaft portion 26 is unable to rotate in the fastening direction. Then, as shown in Figure 36(c), a bolt 250 is inserted through the through hole 240 of the engaging portion 22, and the male threaded portion 250a is screwed into the female threaded hole 260, and the bolt 250 is rotated in the fastening direction. In this state, applying further torque in the fastening direction to the shaft portion 26 and overloading the weak portion 310 causes the shaft portion 26 to break at the weak portion 310, as shown in Figure 36(d), separating the male threaded portion 26a together with the pressing body 28 and causing it to fall. Of course, it is desirable to pick up and remove the fallen portion. Alternatively, the remaining part of the shaft portion 26 after the break may be pulled out from the bridging portion 24 and removed.

[0164] In this way, by arranging the spacer 270, the position of the engaging portion 22 that fits into the receiving member 30a becomes shallower by a length h from the innermost part, and the connecting member 20 can be arranged so that the receiving members 30 and 30a are set to a predetermined height difference, the bridging portion 24 is in a substantially horizontal position between the receiving members 30 and 30a, and both engaging portions 22 are held substantially horizontally.

[0165] Furthermore, the depth to which the engaging portion 22 can be fitted may be restricted by means other than arranging 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 Figure 37(a). The intervening member 280 is a substantially cylindrical member interposed between the female screw hole 260 and the bolt 250. The intervening member 280 has an outer circumferential male thread portion 280a formed on its outer circumferential surface that can be screwed into the female screw hole 260, and an inner circumferential female thread portion 280b formed on its inner circumferential surface that can be screwed into the male thread portion 250a.

[0166] The intervening member 280 can protrude into the housing section 34 by rotating relative to the receiving member 30a. That is, since the outer peripheral male thread portion 280a of the intervening member 280 can screw into the female thread hole 260, it can enter the housing section 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 travel is located inside the housing section 34, the depth to which the engaging portion 22 can be fitted can be restricted. For example, as shown in Figure 37(b), if the height positions of opposing precast floor slabs (not shown) are different, and the receiving member 30a is located at a height h' higher than the receiving member 30, the intervening member 280 is positioned so that it protrudes into the housing section 34 by a length that matches the height difference (length h') between the receiving members 30 and 30a before installing the connecting member 20. Then the connecting member 20 is placed.

[0167] Therefore, the engagement portion 22 contacts the intervening member 280, thereby restricting the depth to which it can be inserted. For this reason, similar to the case where a spacer 270 is provided, a desired height difference can be set between the receiving members 30 and 30a, and the connecting member 20 can be arranged such that the bridging portion 24 is positioned substantially horizontally between the receiving members 30 and 30a and both engagement portions 22 are positioned substantially horizontally. Furthermore, since the intervening member 280 can change its protruding length into the housing 34 by screwing it into the female screw hole 260, it can flexibly accommodate height differences between the receiving members 30 and 30a more flexibly than when spacers 270 are used. In other words, with spacers 270, it is necessary to prepare multiple spacers of various thicknesses to accommodate various height differences, whereas with intervening member 280, only the rotation speed needs to be managed, making it easier to accommodate height differences compared to spacers. Of course, when using spacers 270, if a unit thickness is set, it is easy to accommodate gradual height differences by changing the number of stacked pieces.

[0168] Furthermore, although the above-described embodiments have assumed that the shaft portion 26 has a head portion 26b, the shaft portion 26 may have a substantially rod shape with the head portion 26b omitted. However, the outer circumference shape should be set so that it can engage with the bridging portion 24 in the axial direction. Specifically, as shown in Figure 39(a), the shaft portion 430 may be configured to have a male threaded portion 432 at one end, and the bridging portion 24 may be configured to have a female threaded hole 440 in the center that screws into the male threaded portion 432.

[0169] Furthermore, the shaft portion 430 has a male threaded portion 434 at the other end, and a separate female threaded member 450 can be screwed into the male threaded portion 434, and the pressing body 28 is supported by the female threaded member 450 so that it can be loosely fitted to the shaft portion 430. The female threaded member 450 is a substantially disc-shaped member with an open center, and a female threaded portion that screws into the male threaded portion 434 is formed on the inner surface of the open portion. Therefore, it is also possible to configure the pressing body 28 to be loosely fitted to the shaft portion 430 and the female threaded member 450 to be screwed into the male threaded portion 434 to attach the pressing body 28 to the shaft portion 430.

[0170] Furthermore, the male threaded portion 432 and the male threaded portion 434 may be set with opposite thread directions. For example, if the male threaded portion 432 and the female threaded hole 440 are right-hand threads, while the male threaded portion 434 and the female threaded member 450 are left-hand 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 that brings them relatively closer together. That is, when the shaft portion 430 rotates to the left, the female thread member 450 moves in the tightening direction relative to the shaft portion 430 (towards the end where the bridging portion 24 etc. shown in Figure 39(b) is located), and the pressing body 28 is pushed by the female thread member 450 and moves in the axial direction. On the other hand, the bridging portion 24 moves in the loosening direction relative to the shaft portion 430 (towards the other end where the female thread portion 450 etc. shown in Figure 39(b) is located). Therefore, the pressing body 28 and the bridging portion 24 move to a position where they press against each other, and it is possible to position the precast floor slabs 1, 1 in the same way as in the first embodiment.

[0171] Furthermore, when the shaft portion 430 is arranged as described above, instead of providing the female screw hole 440, a separate female screw member 460 may be provided, and as shown in Figure 39(c), the female screw member 460 may be screwed onto the male screw portion 432 to regulate the relative position of the bridging portion 24 with respect to the shaft portion 430.

[0172] Furthermore, although the shaft portion 430 has been described as having male thread portions 432 and 434 with different orientations at one end and the other end, it is not limited to this, and two types of helical grooves, a right-hand thread and a left-hand thread, may be formed overlapping in the same region. For details on male threads with such two types of helical grooves, please refer to Japanese Patent No. 4663813 by the inventor of this application. When using a shaft portion with such a pair of helical grooves, it is also possible to form helical grooves over the entire axial area of ​​the shaft portion.

[0173] The mounting target members for the receiving members of the joints in each embodiment are not limited to precast floor slabs. The mounting target members are not limited in material or shape, and can be applied to any member as long as they can be joined together by connecting the receiving members with connecting members. The materials of the mounting target members can be concrete, ceramics, glass, metal, synthetic resin, natural resin, wood, or various composite materials. The shapes of the mounting target members can be plate-shaped, column-shaped, block-shaped, etc., and can be applied to joining similar or different types of members. Furthermore, it can be applied to all kinds of articles such as precast concrete members in general, furniture in general, building materials, housing frame materials, and various types of machinery. [Explanation of Symbols]

[0174] 1…Precast slab, 10, 60…Joint, 20…Connecting member, 22…Engaging part, 24…Bridge part, 26…Shaft part, 26a…Male thread part, 26b…Head, 28…Pressing body, 28a…Short side part, 28b…Long side part, 30, 30a…Receiving member, 32…Anchor part, 34…Housing part, 34a…Lip part, 34b…Lower end surface, 36…Restricting part, 38…Step part, 40a, 40b, 40c, 40d…Inner circumferential surface, 50…Head side irregularities, 52…Bridge part side irregularities, 50 a, 52a... Inclined surface, 50b, 52b... Vertical surface, 62... Recessed engagement part, 62a, 62b... Recessed, 70... Biasing member, 80... Long connecting member, 80a... Long bridging part, 82... Short connecting member, 82a... Short bridging part, 86... Through hole, 88... Male threaded pin, 88a... Male threaded part, 88b... Head, 100, 102... Parts, 104... Anchor placement groove, 106... Joining surface, 120... Cover member, 122... Male threaded area, 124... Protrusion, 130... Female threaded area.

Claims

1. A pair of receiving portions are provided on each of the opposing mounting members, and each portion has a recessed receiving portion, A joint comprising a connecting member having a pair of engaging portions that can be fitted into the above-mentioned housing portion and a bridging portion that connects the pair of engaging portions, An intervening portion is provided between the above-mentioned engaging portion and the above-mentioned housing portion to restrict the position of the engaging portion in the insertion direction within the housing portion, thereby making the distance between the engaging portion and the innermost part of the housing portion different on one side of the receiving portion and the other side of the receiving portion, thereby causing the pair of mounting target members to have different relative positions along the insertion direction. The above-mentioned bridging portion has a hole into which the shaft portion can be inserted along the insertion direction of the above-mentioned engaging portion, When the engaging portion is fitted into the housing portion, a positioning mechanism is provided on both the fitted portion and the engaging portion, and the mechanism has contact surfaces that are inclined obliquely with respect to the fitting direction, so as to be able to generate a pressing force in a direction perpendicular to the fitting direction on the outer circumferential surface of the engaging portion and the inner circumferential surface of the housing portion. The positioning mechanism is a joint characterized in that, by fitting the engaging portion into the housing portion, it can displace the planar direction of the mounting members perpendicular to the fitting direction, together with the fitted portion, so that the relative positions of the pair of mounting members fall within a predetermined range, thereby bringing the mounting members closer together or further apart.

2. The joint according to claim 1, characterized in that the hole is a through hole that penetrates the bridging portion.

3. It comprises a contact body that can rotate together with the shaft portion, The coupling according to claim 1 or 2, characterized in that the contact body rotates together with the shaft to a predetermined angle, and then engages in the circumferential direction with a restricting portion formed directly below the housing portion of the fitted portion to restrict its rotation.

4. The aforementioned shaft portion has a male threaded portion, The joint according to claim 3, characterized in that the contact body has a female screw hole that screws into the male screw portion.

5. The joint according to claim 3, further comprising a biasing member that displaces the shaft portion in the axial direction so that the abutment body abuts against one of the fitted portion and the bridging portion.

6. The contact body may contact either the fitted portion or the bridging portion. The shaft portion has a seating surface that abuts against the other of the fitted portion and the bridging portion. The joint according to any one of claims 3 to 5, characterized in that the fitted portion and the bridging portion are sandwiched between the seating surface and the contact body in the axial direction.

7. The hole has an internal threaded portion formed on its inner circumference. The joint according to claim 3, characterized in that the shaft portion has a male threaded portion that screws into the female threaded portion and a contact portion that can abut against or press against the restricting portion.

8. The hole has an internal threaded portion on its inner circumference. The shaft portion has a first male thread portion that screws into the female thread portion, and a second male thread portion that is threaded in the opposite direction to the first male thread portion. The joint according to claim 3, further comprising a female threaded body that is screwed into the second male threaded portion and supports the contact body.

9. The shaft portion has a first male threaded portion and a second male threaded portion with a thread facing the opposite direction to the first male threaded portion. A female threaded member that can be screwed into the first male threaded portion and restricts the relative position of the bridging portion with respect to the shaft portion, The joint according to claim 3, further comprising a female threaded body that is screwed into the second male threaded portion and supports the contact body.

10. The joint according to claim 8 or 9, characterized in that the shaft portion is formed with the first male threaded portion and the second male threaded portion overlapping in the same region.

11. A pair of receiving portions are provided on each of the opposing mounting members, and each portion has a recessed receiving portion, A joint comprising a connecting member having a pair of engaging portions that can be fitted into a pair of the above-mentioned housing portions and a bridging portion that connects the pair of engaging portions, An intervening portion is provided between the above-mentioned engaging portion and the above-mentioned housing portion to restrict the position of the engaging portion in the insertion direction within the housing portion, thereby making the distance between the engaging portion and the innermost part of the housing portion different on one side of the receiving portion and the other side of the receiving portion, thereby causing the pair of mounting target members to have different relative positions along the insertion direction. A joint characterized in that, by fitting the engaging portion into the housing portion, the engaging portion can contact or press against the inner circumferential surface of the housing portion, the mounting target member can be displaced in the planar direction of the mounting target member perpendicular to the fitting direction so as to bring the mounting target members closer together or further apart, and the relative positions of the mounting target members fall within a predetermined range.

12. The joint according to any one of claims 1 to 11, characterized in that the inner circumferential surface of the housing portion has at least a plurality of inclined surfaces facing different directions.

13. The joint according to any one of claims 1 to 12, characterized in that the inner circumferential surface of the housing portion includes an inclined surface that is inclined with respect to the planar direction.

14. The joint according to any one of claims 1 to 12, characterized in that the inner circumferential surface of the housing portion includes an inclined surface that is inclined with respect to the height direction.

15. The joint according to any one of claims 1 to 14, characterized in that the pair of receiving portions have opposing surfaces of the receiving portion inclined at different angles with respect to the insertion direction of the engaging portion, within the inner circumferential surfaces of each receiving portion.

16. The joint according to any one of claims 1 to 14, characterized in that the pair of receiving portions are such that, within the inner circumferential surface of the receiving portion, the opposing surfaces of the receiving portion are inclined at an angle symmetrical with respect to the insertion direction of the engaging portion.

17. The joint according to any one of claims 12 to 14, characterized in that the housing portion has the inclined surface which is inclined in a pyramidal or conical shape.

18. The joint according to any one of claims 1 to 17, characterized in that each of the aforementioned engaging portions is disposed at an equidistant distance from the shaft portion inserted into the bridging portion.

19. The joint according to any one of claims 1 to 17, characterized in that each of the aforementioned engaging portions is arranged at a different distance from the shaft portion inserted into the bridging portion.

20. The coupling according to any one of claims 1 to 19, characterized in that the engaging portion has an outer surface that contacts the inner surface of the housing portion without any gap.

21. The pair of receiving portions are provided with interlocking engagement portions that protrude in directions facing each other, The joint according to any one of claims 1 to 20, characterized in that the receiving portions engage with each other in the insertion direction of the engaging portions by interlocking the opposing protrusions and recesses of the receiving portions.

22. The joint according to any one of claims 1 to 21, characterized in that three or more engaging portions are integrally provided with respect to one of the bridging portions.

23. The fitted portion is composed of a plurality of parts that are separate from each other, The joint according to any one of claims 1 to 22, characterized in that an anchor placement groove, in which an anchor fixed to the member to be attached can be placed, is composed of one or more of the above-mentioned parts.

24. The joint according to claim 23, characterized in that the surface of the portion that forms a bonding surface with other portions is flat, has minute irregularities, or has irregularities that allow it to be fitted together.

25. The aforementioned fitted portion has an installation portion on the opening edge on which a lid member can be installed. The joint according to any one of claims 1 to 24, characterized in that the cover member is installed on the installation portion to close the opening of the fitted portion.

26. The joint according to claim 25, characterized in that the cover member is installed in the installation portion so that one end of it abuts against or presses against the engaging portion which is fitted into the housing portion.

27. The installation portion has a wider opening than the inner circumferential surface of the housing portion and has a female thread region in which a female thread surface is formed. The fitting according to claim 25 or 26, characterized in that the cover member has a male thread region on its surface, which has a male thread surface that screws into the female thread surface of the female thread region.

28. The joint according to any one of claims 1 to 27, characterized in that it has a fixing portion for fixing the engaging portion, which is fitted into the housing portion, to the fitted portion.

29. The aforementioned fixing part is a male screw body, The engagement portion has a hole through which the male screw body is inserted, The fitting portion is characterized in that it has a female screw hole that can be screwed into the male screw body, as described in 28.

30. The joint according to any one of claims 1 to 27, characterized in that the inner circumferential surface of the housing portion includes a first surface substantially parallel to the insertion direction at one end and a second surface located at the other end of the first surface and narrowing from the one end toward the other end.

31. A shaft portion is provided which is inserted into a hole in the engagement portion of the bridging portion that extends along the insertion direction, The coupling according to any one of claims 1 to 30, characterized in that the shaft portion is configured to break when a torque or axial force exceeding a predetermined level is applied.

32. A method for joining members, characterized by joining members to be attached together using a joint according to any one of claims 1 to 31.

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