Joint

Abstract

To provide means that is capable of improving workability of members to be joined and greatly absorbing various errors caused by the joining with a simple structure, and that enables significant time saving for the joining of the members to be joined while attempting labor saving.SOLUTION: A joint that connects a pair of decks, the joint having a receiving member arranged on the deck and an installation member that connects the receiving members, the receiving member has a housing unit and an engagement unit engaged with an installation member to be inserted into the housing unit, the installation member has a pair of insertion units to be inserted into the housing unit and a bridge formation unit that connects the insertion units, and a height adjustment member capable of adjusting a step for positioning the pair of decks at different heights is arranged in the housing unit.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] Conventionally, buildings, structures, accessory parts, etc., including buildings and residential houses, bridges, tunnel segments, structures such as precast products, and accessory equipment and parts such as wall parapets, fittings, and furniture, are constructed by joining multiple components that make up the buildings, structures, accessory parts, etc. A known method of joining components, for example a method of joining precast RC decks of a bridge, is to join the decks by providing convex and concave parts in advance on the surfaces where the decks will be joined, placing the convex part of one deck in the concave part of the other deck, and filling the gap between the decks (the convex part and the concave part) with a filler (see, for example, Patent Document 1). In addition, in the renewal of road bridge decks, the road deck is divided into a plurality of regions in the road width direction (perpendicular to the bridge axis) and each region is replaced with a precast RC deck. A deck joining method (see, for example, Patent Document 2) is known in which a precast RC deck is installed to the side of the existing deck used as a traffic lane, and concrete is filled between the opposing ends of the existing deck and the precast RC deck to form a filler section. In this deck joining method, reinforcing bar joints are embedded in the opposing ends of the two precast RC decks to be joined so that a part of the reinforcing bar joints is exposed to the outside, and the exposed parts of each reinforcing bar joint are protruded into the filler section. In the filler section, the comb-shaped protruding parts of these reinforcing bar joints interfere with each other when viewed in the direction perpendicular to the protrusion, and are arranged so as to be staggered in plan view, and the decks are joined by installing a formwork with the ends of both precast RC decks fixed to each other and pouring concrete between the ends. Also, as another method of joining deck slabs together, a so-called cotter joint is known in which a C-type joint fitting is protruded from each of the opposing sides of a pair of deck slabs, and an insertion portion of an H-type joint fitting is placed into the mating recess of the C-type joint fitting to join the deck slabs together (see, for example, Patent Document 3). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5879452 [Patent Document 2] Patent Publication No. 2021-147884 [Patent Document 3] Patent No. 5787965 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the method described in the above-mentioned Patent Document 1, although the deck slabs are attached to each other via a filler, it is very difficult to deal with dimensional deviations and positional deviations from the design drawings for each site, deformation of the main girders, and distortion and twisting of the precast concrete deck slabs by on-site adjustment. For example, if the deck slab is twisted, since there is no mechanism for generating an internal compulsion force, it may be necessary to introduce an external force to bring the deck slabs closer to a predetermined position while introducing an external compulsion force from multiple heavy machinery, etc., which may force very difficult joining work and cause a significant decrease in work efficiency. In addition, even if a joining state is obtained after such joining work, there is a problem that the joining state cannot be stably obtained for a long period of time because there is no mechanism for generating a holding force that attracts the deck slabs to each other and holds them in a fixed position. For example, when a large vehicle passes directly above the boundary between the deck slabs between the main girders, multi-axial bending loads are generated that cause curvature in the direction of the bridge axis and in a direction perpendicular to the bridge axis. The cross-sectional shape of the boundary surface at the joint between the deck slabs can also cause a large, roughly fan-shaped deformation in the vertical downward direction, and this generates a component force that pulls the deck slabs apart in the direction of the bridge axis. However, there is no mechanism to suppress this, and there are concerns that long-term stability may not be achieved. In addition, the concave and convex parts that form the boundaries between the decks have a trapezoidal shape and include inclined portions in the thickness direction of the decks, which means that the load in the thickness direction (vertical direction) applied to the boundary becomes a component force in the direction that pulls the decks apart due to the inclined portions, which also becomes a factor that can pull the decks apart in the bridge axis direction.

[0005] In addition, in the method described in Patent Document 3, the insertion portion of the H-joint fitting can be fitted into the fitting recess of each C-joint fitting only when a pair of deck slabs are arranged in a predetermined position, and only then can the C-joint fitting and the H-joint fitting be fixed with a bolt. Therefore, if the deck slabs are out of position, there is a problem that it is not possible to fit the insertion portion of the H-joint fitting into the fitting recess of both C-joint fittings and fix them with a bolt. In addition, with a cotter joint, it is not possible to position the deck slabs by fitting the H-joint fitting into the C-joint fitting, so when joining the deck slabs, it is necessary to perform the arrangement of the deck slabs so that the installation error is extremely small. In addition, if the deck slab in this case is a precast RC deck used for bridges, the subsequent deck slab is placed in the approximate position (adjacent to the previously placed deck) using a crane, and then multiple chain blocks are hung on the deck slab and a large number of workers are required to adjust its posture, such as aligning it in the direction along the bridge axis, in the direction perpendicular to the bridge axis, and in the vertical direction, and correcting the inclination relative to the bridge surface. However, due to the inherent on-site errors, the work is extremely difficult and takes a long time, making it very difficult to work with and making it impossible to reduce the number of workers.

[0006] In addition, if the positioning of the deck slabs is performed using the fastening force of the bolts fastening the two insertion portions of the H-type joint fitting and the C-type joint fitting, that is, if the positions of the deck slabs are slightly misaligned and the insertion portion of the H-type joint fitting is halfway into the fitting recess of the C-type joint fitting, and the bolts are forcibly tightened to push the H-type joint fitting with the axial force of the bolts so that the insertion portions fit into the fitting recesses, the bolts cannot be tightened accurately all the way, which means that proper torque management is not possible. In other words, there is a problem that a fastening state based on the introduction of appropriate axial force cannot be obtained by tightening the bolts based on the introduction of appropriate torque.

[0007] In other words, it is extremely difficult to tighten each bolt at the same time with the same speed (or torque), so in practice they are tightened gradually, one side at a time. However, this task is not easy and is greatly influenced by the worker's sense and skill, resulting in the problem that the fastening state varies depending on the worker. More specifically, when the bolts are tightened one side at a time, the tightened side of the H-joint sinks and the opposite side appears to be relatively raised and tilted. As a result, the H-joint may end up being fixed in a different position and in an inclined position than it should be, instead of being fixed in the correct position and posture.

[0008] This not only causes abnormalities in the fastening force, but also reduces fatigue strength and can cause unintended problems with joint compression force. As can be seen from this, it is desirable for H-joint fittings to be installed and fixed in a horizontal position so that they are always kept from tilting. However, at construction sites, etc., such ideal conditions are seldom found, as there are more or less on-site errors, and furthermore, there is inherent twisting in precast RC decks and relative misalignment of each part, so a large error absorption function and performance is required.

[0009] As described above, the methods described in Patent Documents 1 to 3 require many manpower and heavy machinery, and require a huge amount of work time. For example, transporting the deck slabs and arranging them in the designated position requires heavy machinery such as transport trailers and all-terrain cranes, and a large number of manpower, and filling the ready-mixed concrete requires a large amount of equipment and workers for each task, such as concrete pump trucks, filling workers, and formwork workers. With the current installation and joining of deck slabs, since the positioning work requires a lot of time, only about 10 sheets (or less) can be installed and joined per day. Moreover, since a curing period is required for the ready-mixed concrete, there is a problem that the construction time is extended and the construction period is significantly extended. For example, even if a large amount of equipment and manpower is introduced, the current situation is that the task of arranging the deck slabs at one site requires more than 40 minutes of actual work per deck slab. In addition, the placement and joining of deck slabs requires a lot of manpower and equipment, and takes a huge amount of time, making it very difficult to reduce the number of workers required.In addition, the rapid decline in the labor force in recent years has made it difficult to secure on-site workers, which has led to problems such as construction delays and the inability to start construction.

[0010] The present invention was developed through intensive research by the inventors in consideration of the above-mentioned problems, and aims to provide a means that improves the ease of positioning the components to be joined using a simple structure, and is capable of largely absorbing errors in the dimensions, relative positions, etc. of the components to be joined and on-site errors at the joining site, while being easy to install and efficient, thereby enabling labor savings and shortening the work time required to join the components to be joined. [Means for solving the problem]

[0011] The joint of the present invention is a joint that connects a pair of deck slabs and has a receiving member that is arranged on the deck slabs and an erection member that connects the receiving members to each other, wherein the receiving member has a accommodating portion and an engaging portion that engages with the erection member inserted into the accommodating portion, the erection member has a pair of insertion portions that are inserted into the accommodating portion and a bridging portion that connects between the insertion portions, and is characterized in that a height adjustment member that can adjust the step to position the pair of deck slabs at different height positions is arranged in the accommodating portion.

[0012] In the joint of the present invention, the height adjustment member is a stepped washer.

[0013] In addition, the joint of the present invention is a joint that connects a pair of deck slabs, having a receiving member that is arranged on the deck slab and an erection member that connects the receiving members together, wherein the receiving member has a accommodating portion and an engaging portion that engages with the erection member inserted into the accommodating portion, the erection member has a pair of insertion portions that are inserted into the accommodating portion and a bridging portion that connects between the insertion portions, and has a height adjustment member that can be placed in the accommodating portion, and the height adjustment member regulates the accommodating depth of the insertion portions within the accommodating portion.

[0014] In the joint of the present invention, the height adjustment member is a stepped washer.

[0015] In the joint of the present invention, the accommodating portion is formed to have a bottom, and the height adjustment member is capable of being arranged on an inner bottom portion of the accommodating portion.

[0016] In the joint of the present invention, the accommodating portion is formed with a bottom, and the stepped washer can be disposed on an inner bottom portion of the accommodating portion.

[0017] Furthermore, the joint of the present invention is characterized in that the insertion portion has a through hole for inserting a bolt, the receiving member has a female threaded hole into which the bolt is screwed, and the insertion portion is fixed to the receiving member by screwing the bolt inserted into the through hole into the female threaded hole.

[0018] Furthermore, the joint of the present invention is characterized in that the accommodating portion is formed with a bottom, the height adjustment member can be positioned on the inner bottom of the accommodating portion, the insertion portion has a through hole for inserting a bolt, the receiving member has a female threaded hole into which the bolt is screwed, and the insertion portion is fixed to the receiving member via the height adjustment member between the inner bottom and the insertion portion by screwing the bolt inserted into the through hole into the female threaded hole.

[0019] Furthermore, the joint of the present invention is characterized in that the accommodating portion is formed with a bottom, the height adjustment member can be positioned on the inner bottom of the accommodating portion, the insertion portion has a through hole for inserting a bolt, the receiving member has a female threaded hole into which the bolt is screwed, and the insertion portion is fixed to the receiving member via the stepped washer between the inner bottom and the insertion portion by screwing the bolt inserted into the through hole into the female threaded hole. Effect of the Invention

[0020] The joint of the present invention, with its simple mechanism, improves the workability of vertical positioning, and even if there are large errors due to dimensional deviations, positional deviations, deformation, etc. from the design drawings for each site where the joining work is performed, or due to distortion or twisting of the components to be joined, such as precast concrete floor slabs, these errors can be absorbed by so-called on-site adjustment at the site where the joining work is performed, allowing for flexible response and construction with a high degree of freedom, as well as significantly improving workability and significantly shortening the time required for joining the components to be joined, while at the same time making it possible to achieve labor savings, shortening construction time, and increasing strength and durability. [Brief description of the drawings]

[0021] [Figure 1] FIG. 2 is a plan view showing a precast RC floor slab to which a joint according to this embodiment is applied. [Diagram 2] 5A and 5B are diagrams showing a joint position adjusting installation member according to the present embodiment, in which (a) is a perspective view and (b) is a cross-sectional view. [Diagram 3]1A and 1B show a receiving member of a joint according to the present embodiment, in which (a) is a perspective view and (b) is a front view. [Figure 4] 1A is a top view of a receiving member, FIG. 1B is a cross-sectional view taken along line AA, and FIG. 1C is a cross-sectional view taken along line BB. [Diagram 5] 13A and 13B are diagrams showing the positions of the position adjusting installation members when the receiving members are positioned relative to each other. [Figure 6] FIG. 13 is a diagram showing the displacement of the receiving member and the position adjustment installation member. [Figure 7] 13A and 13B are diagrams illustrating alignment of a receiving member that is shifted in the Y direction. [Figure 8] FIG. [Figure 9] FIG. 11 is a cross-sectional view showing a joint from which the male and female threaded bodies have been removed. [Figure 10] 1A is a top view of a connecting member, FIG. 1B is a cross-sectional view taken along line AA, and FIG. 1C is a cross-sectional view taken along line BB. [Figure 11] 13A and 13B are diagrams showing the removal of the connecting member. [Figure 12] FIG. 4 is a cross-sectional view showing a joint provided with a connecting member. [Figure 13] 13A to 13C are diagrams showing a procedure for adjusting the step between the receiving members to determine position. [Figure 14] 13 is a cross-sectional view showing a receiving member fixed to a position adjustment installation member. FIG. [Figure 15] 13A and 13B are diagrams illustrating an example of positioning using stepped washers. [Figure 16] 13A and 13B are views showing the fastening of the insertion portion and the receiving member with a bolt. [Figure 17] 13A and 13B are diagrams showing an example of a position adjustable installation member having a removal means. [Figure 18] 13A and 13B are diagrams showing an example of a position adjustable installation member having a removal means. [Figure 19] 13 is a flowchart showing a connection construction method for precast RC floor slabs using position adjustable erection members. [Figure 20] 13 is a flowchart showing a connection construction method for precast RC floor slabs using position adjustable erection members and connecting members. [Figure 21]1 is a flowchart showing an example of a connection construction method for precast RC floor slabs. [Figure 22] 13 is a flowchart showing an example of a process for removing a position adjustment installation member. [Diagram 23] 13 is a cross-sectional view showing a position-adjustable installation member provided with a removal means. FIG. [Figure 24] 13 is a cross-sectional view showing a position-adjustable installation member provided with a removal means. FIG. [Diagram 25] This figure shows an example of the construction start position and construction progress direction when connecting a precast RC deck to a road bridge. [Figure 26] 13 is a cross-sectional view showing an example of a position-adjustable installation member provided with a removal means. FIG. [Figure 27] 11 is a cross-sectional view showing an example of a state when a hardenable fluid is injected between connected receiving members. FIG. [Figure 28] 11 is a cross-sectional view showing a connecting member inserted to absorb an error in the relative position between the receiving members. FIG. [Figure 29] FIG. 13 is a perspective view showing another example of the removal means. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] Hereinafter, an embodiment of the joint of the present invention will be described with reference to the drawings. The joint of the present invention can be used for connecting precast concrete floor slabs such as precast RC floor slabs, composite floor slabs (steel concrete composite floor slabs), and precast PC floor slabs in architecture, construction, civil engineering structures, etc., and for connecting various members to be joined, but here, the joint will be described as being applied to so-called precast RC floor slabs (members to be joined) that can be used as floor slabs for elevated roads, expressways, bridges (including road bridges, railway bridges, pedestrian bridges, piers, etc.), railway rail foundations, etc.

[0023] Fig. 1(a) is a plan view showing a precast RC slab 1 to which a joint 10 according to this embodiment is applied. The precast RC slab 1 is bridged and fixed on multiple main girders (not shown) arranged in a line perpendicular to the bridge axis. The precast RC slabs 1 are also arranged adjacent to each other along the bridge axis, which is the member connection direction. The joint 10 connects adjacent precast RC slabs 1, 1 to each other. In this case, the direction parallel to the bridge axis direction is generally referred to as the X direction, the direction parallel to the direction perpendicular to the bridge axis is generally referred to as the Y direction, and the direction perpendicular to the XY plane is generally referred to as the Z direction. For example, if the XY plane is a plane parallel to the horizontal plane, the Z direction is the vertical direction. Here, the precast RC deck 1 is set only with the member connection direction along the Y direction, but this does not necessarily mean that the member connection direction must be set in the Y direction, and it may be set along the X direction, or along both the X and Y directions as shown in Figure 1(b).

[0024] The joint 10 constitutes a so-called cotter joint structure. That is, the joint 10 has a position adjustable erection member 20 and receiving members 30a, 30b, and is configured so that the position adjustable erection member 20 can be inserted into the two receiving members 30a, 30b that are attached to adjacent precast RC floor slabs 1, 1 and face each other, and positioning and erection can be performed simultaneously. The receiving members 30a, 30b can be made to have approximately the same shape, but as long as they have a shape that allows at least the position adjustable erection member 20 to be inserted, they are not limited to being the same shape and may be different shapes.

[0025] 2 is a diagram showing the position-adjusting erection member 20 of the joint 10 according to this embodiment, where (a) is a perspective view, (b) is a cross-sectional view, and (c) is a plan view. The position-adjusting erection member 20 is generally dumbbell-shaped in plan view and has a pair of insertion parts 22, 22 that can be inserted into the receiving members 30a, 30b, respectively, and a bridging part 24 connected to the pair of insertion parts 22, 22.

[0026] The insertion portion 22 as a whole has a shape similar to an inverted mushroom with the cap portion positioned on the bottom, that is, like an upside-down mushroom, and is configured to have an insertion escape portion 22a having a substantially cylindrical shape on the upper side, a cylindrical insertion portion 22b set to a relatively large diameter below this, and a guide portion 22c further below this that gradually reduces in diameter toward the bottom end.

[0027] Here, the insertion escape portion 22a is set to have an approximately cylindrical shape, but the outer shape does not necessarily have to have a cylindrical surface shape. It is sufficient that the outer shape is radially smaller than the outer dimensions of the insertion portion 22b, and it can have any desired outer shape, such as a polygonal shape or an elliptical shape.

[0028] The insertion portion 22b forming the maximum outer diameter portion of the insertion portion 22 has an outer diameter whose maximum outer diameter portion is approximately equivalent to the inner diameter of the accommodation portion 32 (described later) of the receiving members 30a, 30b. (However, it is preferable to set the outer diameter of the insertion portion 22b to be slightly smaller than the inner diameter of the accommodation portion 32 in terms of improving ease of insertion and removal.) Therefore, the maximum outer diameter portion of the insertion portion 22b can fit into the receiving members 30a, 30b in a state of being in close contact with the inner circumferential surface of the accommodation portion 32 at least partially or entirely.

[0029] In addition, the insertion part 22 can appropriately set the axial lengths (Z-direction lengths) of the insertion escape part 22a, the insertion part 22b, and the guiding part 22c. Here, the axial lengths of the insertion part 22b and the guiding part 22c are set shorter than that of the insertion escape part 22a. The guiding part 22c is set to have a shape in which the diameter gradually decreases toward the lower end, but it can be set to a substantially frustum-of-a-cone shape. Of course, the gradually decreasing diameter form of this guiding part 22c is not limited to the substantially frustum-of-a-cone shape, and it may be constituted by a hemispherical surface shape, other curved surface shapes, or combinations thereof. Note that the lower end part of the guiding part 22c is configured to match the inner fixed surface of the accommodating part 32 of the receiving members 30a and 30b. Further, the lower surface of the lower end part of the guiding part 22c can be configured to be substantially flush with the lower end surface of the bridging part 24. By doing so, when a Z-direction load is applied to the central part of the bridging part 24 spanning between the insertion parts 22 and 22, the stress distributed at the boundary part between the lower end part of the guiding part 22c and the lower end surface of the bridging part 24 can be relaxed, and it becomes possible to prevent tearing that may occur at this boundary part.

[0030] The insertion part 22 has a through hole 40 through which a bolt 50 (see FIG. 9) is inserted in the Z direction. The through hole 40 has a first inner peripheral surface 42 surrounding the shaft part of the bolt 50, a second inner peripheral surface 44 having a larger diameter than the first inner peripheral surface 42 and surrounding the head 54 (see FIG. 9) of the bolt 50, and a support surface 46. The support surface 46 can support the seating surface of the head 54 of the bolt 50 via a clearance adjusting washer 56 described later.

[0031] The through hole 40 is preferably set to have an inner diameter that allows displacement of the inserted bolt 50 in the radial direction. That is, the first inner peripheral surface 42 is preferably set to have an inner diameter larger than the outer diameter of the bolt 50. For example, when the radius of the shaft of the bolt 50 is a, the radius of the head 54 is b, and the radius of the first inner peripheral surface is c, the lengths and the like are set so that a < b < c or a < c ≤ b holds. Further, the inner diameter d of the second inner peripheral surface 44 is set to a length equal to or greater than the length obtained by adding the difference (c - a) obtained by subtracting the radius a of the shaft from the inner diameter c of the first inner peripheral surface to the radius b of the head 54 so as not to prevent the bolt 50 from displacing in the radial direction. That is, the lengths of the respective parts can be set so as to satisfy b + (c - a) ≤ d.

[0032] Depending on the specifications of the bolt 50, the outer diameter of the head 54 may be equal to or smaller than the inner diameter of the first inner surface 42. In such a case, in order to prevent the head 54 from falling off into the first inner surface 42, it is advisable to place a gap adjusting washer 56 (see, for example, Figure 8) having sufficient outer diameter, thickness and strength between the head 54 and the support surface 46.

[0033] The bridging portion 24 has a hole penetrating in the Z direction at approximately the center in the X and Y directions, through which the male threaded body 100 can be inserted. The male threaded body 100 has a shaft portion 102 that is inserted into the bridging portion 24, and a pressing portion 104 as a head portion provided at one end of the shaft portion 102. The male threaded body 100 is used in an orientation in which the pressing portion 104 is located on the side where the guiding portion 22c exists (the lower side in FIG. 2). Therefore, the female threaded body 110 is disposed above the bridging portion 24.

[0034] A male screw helical groove is formed on the outer circumferential surface of the shaft portion 102. The male screw helical groove may be formed over the entire shaft portion 102, or may be formed from the tip of the shaft portion 102 to the middle thereof. Furthermore, a breakable portion 102a having a V-shaped groove engraved in the circumferential direction may be formed in the middle of the shaft portion 102. The cross-sectional area of ​​the breakable portion 102a is set to be the smallest in the shaft portion 102, and therefore the breakable portion 102a can be the portion of the shaft portion 102 that can be broken first when a torque or axial force equal to or greater than a predetermined value is applied.

[0035] The pressing portion 104 is generally rectangular in plan view and is formed to a size that allows it to engage with the bridging portion 24. That is, the pressing portion 104 can have a pair of short side portions 104a and a pair of long side portions 104b. The short side portions 104a are set to a length that is less than the gap between the receiving members 30a, 30b when connected. The long side portions 104b are set to a length that exceeds the gap between the receiving members 30a, 30b when connected.

[0036] Therefore, the pressing part 104 with the short side portion 104a oriented parallel to the X direction can be in non-contact with both the receiving members 30a, 30b. On the other hand, the pressing part 104 with the long side portion 104b oriented parallel to the X direction can come into contact (interfere) with both the receiving members 30a, 30b.

[0037] In addition, the pressing portion 104 is not limited to a rectangular shape when viewed from above, so long as it has a portion corresponding to each of the short side portion 104a and the long side portion 104b, and may be, for example, a roughly elliptical shape when viewed from above, a roughly oval shape when viewed from above, a polygonal shape when viewed from above, or the like.

[0038] Fig. 3 shows the receiving member 30 (receiving members 30a and 30b) according to this embodiment, (a) being a perspective view, and (b) being a front view in which the surface facing the position adjustable installation member 20 is the front side. Fig. 4 shows the receiving member 30, (a) being a top view, (b) being an AA cross-sectional view, and (c) being a BB cross-sectional view.

[0039] The receiving members 30 are C-shaped joint fittings that receive the insertion portions 22. Although the receiving members 30 are C-shaped fittings, they are not limited to being made of a metal material as long as they have sufficient strength to connect precast RC decks together.

[0040] The receiving member 30 is embedded in advance in the X-direction side portion of the precast RC floor slab 1. Specifically, the receiving member 30 is embedded in the XY plane of the precast RC floor slab 1 so that the positioning portion 20 can be inserted therein.

[0041] The receiving member 30 has an anchor mounting hole 31, a storage portion 32, an inclined guide surface 34, a female threaded hole 36, a pair of locking portions 38, a regulating recess 60, etc. The anchor mounting hole 31 is a screw hole or the like for mounting and fixing an anchor (not shown) disposed in the precast RC deck 1.

[0042] The accommodation portion 32 defines an internal space into which the insertion portion 22 can be inserted by opening the XY plane of the receiving member 30. The inclined guide surface 34 forms the inner peripheral surface of the opening in the accommodation portion 32, and guides the insertion portion 22 while sliding against the guide portion 22c having a substantially inverted truncated cone shape provided on the lower end side of the insertion portion 22 so that the insertion portion 22 entering the accommodation portion 32 moves toward the center of the accommodation portion 32. That is, the inclined guide surface 34 gradually inclines radially outward from within the accommodation portion 32 toward the opening end, thereby widening the opening in the accommodation portion 32 and gradually narrowing the opening along the insertion direction of the insertion portion 22.

[0043] In addition, since the inner diameter of the accommodating portion 32 is set to be slightly larger than the outer diameter of the insertion portion 22b which constitutes the maximum outer diameter portion of the insertion portion 22, the outer peripheral surface of the insertion portion 22b slides and is inserted into the inner peripheral surface of the accommodating portion 32. Since the inner peripheral surface of the accommodating portion 32 has an inner diameter larger than the outer diameter of the insertion escape portion 22a, when the insertion portion 22 is inserted into the accommodating portion 32, an active gap into which a hardenable fluid, which will be described later, can be actively injected can be present between the accommodating portion 32 and the insertion escape portion 22a.

[0044] The female threaded hole 36 is formed in the bottom of the accommodating portion 32. The female threaded hole 36 communicates with a through hole 40 of the insertion portion 22 that is inserted into the insertion portion 22, and is configured to be able to screw into a bolt 50 that is inserted into the through hole 40.

[0045] The locking portions 38, 38 are formed by connecting one side of the receiving member 30, which is parallel to the Y direction and faces the receiving members 30, 30, with the accommodating portion 32, and are a pair of opposing wall surfaces that define this connecting portion and form an approximately V-notched slit along the Z direction.When the bridging portion 24 is inserted into the connecting portion of the receiving member 30, the locking portions 38 and the bridging portion 24 are guided while sliding against each other, thereby regulating the position and displacement in the Y direction of the insertion portion 22 inserted into the accommodating portion 32.

[0046] 3(b) (referred to as the front direction), the locking portions 38 are inclined inward (toward the center) along the Y direction from the top to the bottom of the receiving member 30. That is, the space corresponding to the slit between the locking portions 38 gradually narrows along the insertion direction of the bridging portion 24.

[0047] The restricting recess 60 is recessed into the lower end surface (rear surface) of the receiving member 30 shown in Fig. 3(b) and can engage with the long side portion 104b of the pressing portion 104. That is, the restricting recess 60 has a first restricting portion 62 and a second restricting portion 64 that restrict the rotation of the pressing portion 104. The first restricting portion 62 extends in the Z direction within the restricting recess 60 so as to engage with the long side portion 104b of the pressing portion 104 that rotates in the fastening direction.

[0048] The second restricting portion 64 faces the first restricting portion 62 and extends in the Z direction inside the restricting recess 60. The second restricting portion 64 can be set to have a shorter length in the Z direction than the first restricting portion 62. Therefore, when the second restricting portion 64 abuts against the lower end surface of the receiving member 30 inside the restricting recess 60, it can abut against the pressing portion 104, making it possible to restrict rotation in the loosening direction.

[0049] Next, a process for positioning the receiving member 30 when connecting the precast RC slabs 1a and 1b (see FIG. 5) along the X direction will be described. Among the receiving members 30, the one placed on the precast RC slab 1a is referred to as receiving member 30a, and the one placed on the precast RC slab 1b is referred to as receiving member 30b.

[0050] The precast RC slabs 1a, 1b are arranged adjacent to each other along the X direction with the receiving members 30a, 30b facing each other. Of the precast RC slabs 1a, 1b, one precast RC slab 1a is fixed onto multiple main girders arranged side by side at a predetermined interval in the Y direction at one start part of the bridge, and the other precast RC slab 1b is erected and arranged displaceably over multiple main girders in a position close to the precast RC slab 1a by hanging or the like. Precast RC decks 1a, 1b are arranged approximately parallel to each other along the Y direction and adjacent to each other in the X direction. The position adjustment erection member 20 is erected across each of the receiver members 30a and 30b by inserting the insertion portions 22, 22 into the receiving portion 32 of the receiver member 30a and the receiving portion 32 of the receiver member 30b, thereby displacing the precast RC deck 1b (receiving member 30b) and positioning it relative to the precast RC deck 1a (receiving member 30a).

[0051] Fig. 5 is a diagram showing the relative positional relationship including the position-adjusting installation member 20 when the receiving members 30a, 30b are positioned relative to each other. Fig. 6 is a diagram showing the displacement of the receiving member 30b relative to the receiving member 30a due to the forced displacement of the position-adjusting installation member 20. In Figs. 5 and 6, the receiving members 30a, 30b are shown in cross section to clarify the position of the insertion portion 22 inside the receiving members 30a, 30b. The anchors inserted into the anchor mounting holes 31 of the receiving members 30a, 30b are omitted.

[0052] The female-threaded body 110 is screwed onto the upper end of the male-threaded body 100, and the orientation of the pressing portion 104 is determined in advance so as not to interfere with the receiving members 30a and 30b, and the phase is determined so that the short side portion 104a is parallel to the X direction, and the position adjusting installation member 20 is placed above so as to straddle the receiving members 30a and 30b. Next, as shown by the arrow in Figure 5(a), the position adjusting installation member 20 is lowered to insert the insertion portion 22 into the receiving members 30a and 30b, respectively.

[0053] At this time, the guide portion 22c provided at the lower end of the insertion portion 22 abuts against the inclined guide surface 34 provided near the upper end opening of each of the accommodation portions 32 of the receiving members 30a, 30b, and the shaft portion 102 enters the gap between the receiving members 30a, 30b (between the precast RC floor slabs 1a, 1b). The pressing portion 104 can be positioned at a vertical position where it can enter the restricting recesses 60 of the receiving members 30a, 30b, or can be positioned lower than the restricting recesses 60.

[0054] If the precast RC decks 1a, 1b are spaced apart further than the correct connection position, the guide portion 22c of the insertion portion 22 may abut against the inclined guide surface 34 near the upper opening of the storage portion 32 and become engaged, as shown in Figure 5(b).

[0055] Next, a torque in the fastening direction is applied to the female-threaded body 110 by a fastening tool such as a manual wrench or an electric nut runner. When the female-threaded body 110 rotates in the fastening direction, the pressing portion 104 rotates and enters the restricting recess 60 and is accommodated therein. Specifically, when the pressing portion 104 is located below the restricting recess 60, the long side portion 104b abuts against the precast RC floor slabs 1a, 1b, restricting the rotation of the male-threaded body 100 relative to the rotating female-threaded body 110. Therefore, the male-threaded body 100 rotates relative to the female-threaded body 110 and displaces upward. This causes the pressing portion 104 to displace upward to a position where it can enter the restricting recess 60.

[0056] When the pressing portion 104 is in a position where it can enter the restricting recess 60, the male-threaded body 100 rotates in conjunction with the rotation of the female-threaded body 110. Therefore, as shown in Fig. 5(c), the pressing portion 104 rotates approximately 90° and the long side portion 104b enters the restricting recess 60 and comes into contact with the first restricting portion 62, thereby restricting the rotation.

[0057] Furthermore, when torque in the fastening direction is applied to the female threaded body 110, the pressing portion 104 presses the lower end faces of the receiver members 30a, 30b. The female threaded body 110 also presses the position adjustable installation member 20 toward the receiver members 30a, 30b. Therefore, the female threaded body 110 and the pressing portion 104 press the receiver members 30a, 30b and the connecting portion 20 in directions that bring them closer to each other.

[0058] The receiving member 30b is displaced inward in the X direction by the pressure from the guide portion 22c in contact with the inclined guide surface 34. That is, the force pressing the connecting portion 20 in the negative Z direction (vertically downward) causes the guide portion 22c to slide as it contacts the inclined guide surface 34, which acts as a force pressing the receiving member 30b inward in the X direction (see FIG. 6(a)), displacing the precast RC floor slab 1b via the receiving member 30b in the X direction toward the receiving member 30a and the precast RC floor slab 1a so as to reduce the relative distance.

[0059] Therefore, each time the female threaded body 110 is rotated in the fastening direction, the receiver 30b is gradually displaced toward the receiver 30a, and the inserted portion 22 is inserted toward approximately the center of the receiving portion 32, as shown in Fig. 6(b). When the inserted portions 22, 22 are inserted to the innermost portion of the receivers 32a, 32b (the inner bottom surfaces of the receiving portions 32, 32) in this manner, the receiver 30b is positioned relative to the receiver 30a. At the same time, the precast RC decks 1a, 1b are positioned at the appropriate connecting positions.

[0060] The receiving member 30b is displaced by the guide portion 22c pressing the inclined guide surface 34. Therefore, the displaceable direction of the receiving member 30b is all directions of the area where the receiving member 30b can interfere with the guide portion 22c having an inverted truncated cone shape with a substantially C-shaped tapered surface at the lower end side of the insertion portion 22 relative to the substantially C-shaped area in plan view where the inclined guide surface 34 is formed, that is, all directions in the XY plane. When the insertion portion 22 is inserted into the housing portion 32, the guide portions 22c, 22c provided at the lower end of the insertion portion 22 slide and are guided by the inclined guide surfaces 34, 34 provided near the upper end openings of the housing portions 32 of the receiving members 30a, 30b, respectively, and the receiving member 30b moves in the XY plane, eliminating the interference between the guide portion 22c and the inclined guide surface 34 in plan view, and is displaced to a proper position relative to the receiving member 30a and positioned.

[0061] For example, when the position of the receiver member 30b relative to the receiver member 30a is shifted in the Y direction from the proper connecting position (see FIG. 7(a)), the receiver member 30b and the precast RC floor slab 1b can be displaced in the Y direction by inserting the insertion portions 22, 22 into the receiver members 30a, 30b in the same manner as described above. That is, when the guide portion 22c abuts against the inclined guide surface 34 at a position offset to one side in the Y direction of the accommodation portion 32 of the receiver member 30b, the receiver member 30b is displaced in the Y direction together with the precast RC floor slab 1. When the insertion portion 22 is inserted to the innermost position of the receiver member 30b, the receiver member 30b is positioned at the proper connecting position in the Y direction relative to the receiver member 30a, as shown in FIG. 7(b).

[0062] When precast RC decks 1a, 1b are connected at the same height, even if the receiving members 30a, 30b are located at different heights before connection, the receiving member 30b can be positioned at the same height relative to the receiving member 30a by inserting the insertion portions 22, 22 into the innermost portions of the storage portions 32, 32 of the receiving members 30a, 30b, respectively.

[0063] Specifically, when the insertion portions 22, 22 are inserted into the accommodation portions 32, 32 of the reception members 30a, 30b, respectively, and the female-threaded body 110 is rotated in the fastening direction, the reception member 30b is pressed in the axial direction by either the pressing portion 104 or the position adjustment installation member 20. For example, when the reception member 30b is positioned above the reception member 30a, the position adjustment installation member 20 presses the bottom of the accommodation portion 32. When the reception member 30b is positioned below the reception member 30a, the pressing portion 104 presses the lower end surface of the reception member 30b. As a result, the reception member 30b is displaced and positioned at the same height as the reception member 30a.

[0064] As described above, the positioning of the receiving members 30a, 30b by the position adjustment installation member 20 is effective in any of the X, Y, and Z directions, and by simply inserting the position adjustment installation member 20 all the way into the receiving members 30a, 30b, the receiving member 30b can be displaced relative to the receiving member 30a to the appropriate connecting position. Of course, it is desirable to insert the insertion portion 22 of the position adjustment installation member 20 all the way into the receiving members 30a, 30b, but if the insertion portion 22 can be inserted to the extent that the receiving members 30a, 30b can be positioned, it is possible to omit inserting the insertion portion 22 all the way into the receiving members 30a, 30b.

[0065] After the receiving members 30a, 30b are positioned, the insertion portions 22, 22 and the receiving members 30a, 30b are fixed with bolts 50, 50, as shown in the cross-sectional view of the joint 10 in Figure 8. That is, the bolts 50, 50 are inserted into the through holes 40, 40 of the insertion portions 22, 22, and the male threaded portions 52, 52 of the bolts 50, 50 are screwed into the screw holes 34b, 34b at the bottoms of the accommodation portions 32, 32, respectively, for fastening.

[0066] After the receiving members 30a, 30b are connected by the position-adjusting installation member 20, the male-threaded body 100 remains protruding from the upper surface of the precast RC deck 1, and is removed. To remove this male-threaded body 100, first, a torque of a predetermined level or more in the fastening direction is applied to the female-threaded body 110, thereby applying a torsional axial force of a predetermined level or more to the male-threaded body 100, and breaking the easily breakable portion 102a formed in advance near the pressing portion 104.

[0067] As shown in Figure 9, the male-threaded body 100 in which the easily breakable portion 102a has been broken has the pressing portion 104 and the shaft portion 102 separated, and therefore can be removed together with the female-threaded body 110 by pulling the shaft portion 102 out of the position adjustment installation member 20.

[0068] The pressing part 104 separated from the shaft part 102 is displaced and retained on a blocking material (not shown) or the like that is arranged to block hardening fluid such as mortar or grout below between the precast RC floor slabs 1a, 1b, and is then recovered by a recovery means (not shown). The recovery means can be, for example, a magnetic field generating means such as a permanent magnet or electromagnet that is arranged on the lower end of a long handle, and by using such a recovery means, the pressing part 104 that has fallen onto the blocking material due to the breakage of the easily breaking part 102a can be magnetically attracted to the magnetic field generating means and recovered.

[0069] In the above, the insertion portions 22, 22 and the receiving members 30a, 30b are fixed with the bolts 50, 50, and then the male-threaded body 100 and the female-threaded body 110 are removed, but the insertion portion 22 and the receiving members 30a, 30b may be fixed with the bolts 50, 50 after the male-threaded body 100 is broken and the male-threaded body 100 and the female-threaded body 110 are removed. The bolt 50 is a so-called T-bolt having a pressing portion 104 at the lower end, and the female-threaded body 110 is screwed into the upper portion of the shaft portion 102, but this is not necessarily limited to this, and it is also possible that the male-threaded body has a head at the upper end of its shaft portion, and a female-threaded body having a substantially rectangular parallelepiped shape at the lower end is used as the pressing portion.

[0070] In the above, the male-threaded body 100 is broken when removing the male-threaded body 100 and the female-threaded body 110, but this breaking is not an essential process. For example, the female-threaded body 110 can be separated by rotating it in a direction to loosen it relative to the male-threaded body 100, and the male-threaded body 100 can be dropped from the position adjusting installation member 20 and removed. Of course, if it is desired to maintain the state in which the male-threaded body 100 exists between the receiving members 30a and 30b, it goes without saying that the male-threaded body 100 may be left inserted through the position adjusting installation member 20. At this time, the female-threaded body 110 may be left threadedly engaged with the male-threaded body 100, or may be separated from the male-threaded body 100 and removed. When removing the position adjustment installation member 20 from the receiving members 30a and 30b, it is not necessary to break the male-threaded body 100, and the male-threaded body 100 can be removed together with the position adjustment installation member 20. At this time, the female-threaded body 110 may remain screwed into the male-threaded body 100.

[0071] As described above, according to the joint 10 of this embodiment, even if the receiving members 30a, 30b are misaligned from the predetermined position in any of the X, Y, and Z directions, the misalignment can be corrected and positioning can be completed by simply inserting the insertion portions 22, 22 of the position adjustable erection member 20 into the receiving members 30a, 30b, respectively, and performing a simple operation of screw fastening, for example, by rotating the female threaded body 110 in the fastening direction. Therefore, the positioning operation becomes easier, shortening the time required for proper placement of the deck slab, improving work efficiency and greatly improving workability.

[0072] In addition, the insertion parts 22, 22 of the position-adjustable erection member 20 are fitted into the accommodation parts 32, 32, so that the receiving members 30a, 30b can be positioned. This allows flexible response to errors such as dimensional deviations, positional deviations, and deformations from the design drawings for each site, and distortions and twists of the precast RC floor slab, allowing for highly flexible construction and significantly reducing the labor required for so-called on-site alignment work. That is, if the insertion part 22b, which forms the maximum outer diameter part of the insertion part 22, enters the accommodation part 32 and the lower end of the guiding part 22c can reach the innermost part of the accommodation part 32, the precast RC floor slabs 1a, 1b will be automatically positioned relative to each other in the X, Y, and Z directions. At this time, the insertion escape part 22a does not come into contact with the inner circumferential surface of the accommodation part 32, so that the fit between the insertion part 22 and the accommodation part 32 can be improved by adjusting the height of the insertion escape part 22a.

[0073] Therefore, by setting the Z-direction length of the insertion portion 22b to a short length, even if the axes of the storage portions 32, 32 of the receiving members 30a, 30b are non-parallel to each other due to distortion or twisting of the precast RC deck, this parallelism error can be absorbed and forced, and the insertion portions 22, 22 can be easily inserted into the storage portions 32, 32.

[0074] The insertion portion 22b may be extended in the Z direction to be longer. In this way, the effect of improving the coaxiality between the insertion portion 22 and the housing portion 32 can be obtained.

[0075] In addition, there are gaps in the receiving section 32 into which the insertion section 22 is inserted, between the second inner peripheral surface 44 in the hole 40 and the head 54, and in particular between the insertion escape section 22a and the inner peripheral surface of the receiving section 32, so that these gaps may be filled by injecting a hardening fluid such as mortar, grout, gypsum, ready mixed concrete, water glass, or a synthetic resin in a thermosetting or thermoplastic fluid state (see, for example, FIG. 27(a)). In this way, by injecting a hardening fluid into the gap between the insertion escape section 22a and the receiving section 32 and hardening it, the position adjustable erection member 20 and the receiving members 30a and 30b can be fixed more firmly, and the rigidity of the receiving members 30a and 30b and the position adjustable erection member 20 can be increased, and fatigue resistance can be improved.

[0076] The hardening fluid can also be injected into all gaps that exist between the precast RC decks 1a, 1b, thereby making it possible to further firmly connect the precast RC decks 1a, 1b to each other.

[0077] Furthermore, in connecting the receiving members 30a, 30b and the position adjusting erection member 20, the receiving members 30a, 30b and the position adjusting erection member 20 are positioned and fastened between the male threaded body 100 and the female threaded body 110 at the center of the bridging portion 24, so that the insertion portions 22, 22 can be inserted into the receiving portions 32, 32 while maintaining the horizontality of the position adjusting erection member 20. This makes it possible to prevent the position adjusting erection member 20 from being inserted into the receiving members 30a, 30b in an attitude tilted with respect to the XY plane, and makes it possible to reliably prevent positioning failure.

[0078] Incidentally, the shape of the guide portion 22c is a substantially inverted truncated cone shape, but of course, the shape is not limited to this, and may be a substantially polygonal pyramid shape such as a substantially triangular pyramid shape or a substantially square pyramid shape having a tapered tip portion that facilitates entry into the storage portion 32, a substantially conical shape, a substantially polygonal pyramid shape, or the like. Similarly, the shape of the internal space within the range surrounded by the inclined guide surface 34 of the storage portion 32 may be a substantially inverted truncated cone shape, or may be a substantially polygonal pyramid shape, or the like.

[0079] Next, a case will be described in which the receiver members 30a, 30b are connected using a connecting member other than the position adjusting erection member 20. In the above embodiment, after the receiver members 30a, 30b are positioned by the position adjusting erection member 20, the insertion parts 22, 22 and the receiver members 30a, 30b are fixed by the bolts 50, 50, respectively, but in the following, the position adjusting erection member 20 (first member) is used for positioning, and the receiver members 30a, 30b are connected and fixed by a connecting member (second member) that does not have a positioning function as a fixing member other than the position adjusting erection member 20.

[0080] Fig. 10 shows an example of a connecting member 70, where (a) is a top view, (b) is a cross-sectional view showing the AA cross section in Fig. 10(a), and (c) is a cross-sectional view showing the BB' cross section in Fig. 10(b). As shown in Fig. 10, the connecting member 70 is composed of a pair of insertion portions 72 (second insertion portions), a bridging portion 74 connecting the pair of insertion portions 72, and the like.

[0081] The insertion portion 72 has a generally uniform cylindrical shape in cross section perpendicular to the insertion direction, and its outer diameter is set to be less than the inner diameter of the storage portion 32, preferably to have a necessary and sufficient clearance to absorb installation errors of the deck slab, dimensional errors of the deck slab itself, and manufacturing errors such as twisting and warping. Therefore, between the insertion portion 72 and the storage portion 32, there is an active gap into which the hardening fluid can be actively injected.

[0082] Furthermore, a hole 80 is formed in the insertion portion 72, penetrating vertically for inserting the bolt 50 in the Z direction. The hole 80 has an area 80a capable of surrounding the shaft portion of the bolt 50, and an area 80b surrounding the head portion 54 of the bolt 50. Furthermore, the hole 80 forms the boundary portion between the areas 80a and 80b, and has a support surface 82 that allows the gap adjusting washer 56 to be disposed therein and that supports the seat surface on the lower side of the gap adjusting washer 56.

[0083] The size of the internal space of the hole 80 is set so that the inserted bolt 50 can be displaced radially relative to the bolt 50 and can sufficiently absorb errors. Specifically, the region 80a is set to be sufficiently larger than the diameter of the shaft portion of the bolt 50. The region 80a may be set to have an inner diameter smaller than the outer dimension of the head 54 or larger than the outer dimension of the head 54, but it can be set so that the head 54 does not fall or sink into the region 80a by using a gap adjusting washer 56 having a sufficient area, thickness, and strength. The region 80b is set to have an inner diameter sufficiently larger than the outer dimensions of the head 54 and the gap adjusting washer 56 so that the head 54 and / or the gap adjusting washer 56 can be displaced radially relative to the head 54 inside the region 80b and can sufficiently absorb errors.

[0084] The connection of the receiving members 30a, 30b by the connecting member 70 is performed after the receiving members 30a, 30 are positioned by the position adjustable erection member 20. For some or all pairs of the receiving members 30a, 30b among the multiple receiving members 30a, 30b embedded and arranged facing each other at a predetermined interval across the width of the precast RC floor slab, the position adjustable erection member 20 is used to position and connect the facing precast RC floor slabs, while the connecting member 70 is inserted and connected to the remaining receiving members 30a, 30b. At the points where the position adjustable erection member 20 is used for positioning and connecting, the position adjustable erection member 20 and the connecting member 70 may be replaced to connect the receiving members 30a, 30b.

[0085] For this purpose, first, the insertion portion 22 is inserted into the receiving portion 32 and torque in the fastening direction is applied to the female-threaded body 110 to position the receiver members 30a, 30b. Next, the connecting member 70 is inserted into the remaining receiver members 30a, 30b to connect them, and then the position adjustment installation member 20 used for positioning is removed from the receiver members 30a, 30b. At this time, the female-threaded body 110 that has fastened the position adjustment installation member 20 is rotated in the loosening direction, and the male-threaded body 100 is released from the rotation restriction by the second restriction portion 64, allowing relative displacement in the axial direction.

[0086] When the pressing portion 104 is displaced to a position where it does not interfere with the second restricting portion 64, the male threaded body 100 can rotate approximately 90°, for example by rotating together with the female threaded body 110, to disengage from the restricting recess 60. This 90° rotation causes the short side portion 104a of the pressing portion 104 to be oriented approximately parallel to the X direction, as shown in Fig. 11(a). At this time, the position adjustable installation member 20 can be removed from the receiving members 30a, 30b.

[0087] The method for removing the position adjustment erection member 20 is not particularly limited, but for example, the male threaded body 100 can be pulled up to remove the position adjustment erection member 20. That is, when the male threaded body 100 is pulled up, the pressing portion 104 gets caught on the lower end surface of the position adjustment erection member 20 (the bridging portion 24) as shown in Fig. 11(b), so that the position adjustment erection member 20 can be pulled out from the receiving members 30a, 30b by lifting it.

[0088] After removing the position-adjustable erection member 20 from the receiving members 30a, 30b, the connecting member 70 is inserted into the receiving members 30a, 30b. That is, the insertion portion 72 is inserted into the receiving portion 32 of the receiving members 30a, 30b. Also, as shown in FIG. 12, the bolt 50 is inserted into the hole 80 via the gap adjusting washer 56, and the male threaded portion 52 is screwed into the female threaded hole 36 for fastening. This fixes the connecting member 70 to the receiving members 30a, 30b, and the receiving members 30a, 30b and the precast RC deck slabs 1a, 1b are connected to each other by the connecting member 70. In this case, the presence of a positive gap between the bolt 50 and the area 80a that can surround the male threaded portion 52 of the bolt 50, and a positive gap between the inner surface of the accommodating portion 32 and the outer surface of the insertion portion 72 makes it possible to fully absorb errors regarding the relative position of the receiving members 30a and 30b and the parallelism of their axes.

[0089] For example, when the relative positions of the receiver members 30a and 30b are close to each other within the range of error of a predetermined distance, the insertion portion 72 is located at a position biased outward in the X direction in each of the accommodation portions 32 of the receiver members 30a and 30b as shown in Fig. 28. Furthermore, at this time, both bolts 50 inserted into the holes 80 of the receiver members 30a and 30b are located at a position biased inward in the X direction in each region 80a, and are fastened by being screwed into the female threaded hole 36. Therefore, the presence of the positive gap between the male threaded portion 52 of the bolt 50 and the region 80a, and the positive gap between the inner peripheral surface of the accommodation portion 32 and the outer peripheral surface of the insertion portion 72 can absorb the error between the receiver members 30a and 30b and insert the connecting member 70, so that it is possible to largely absorb errors in dimensions, relative positions, etc., that are inherent in the members to be joined, and on-site errors at the joining site, and the like, and improve workability and work efficiency.

[0090] Moreover, after the receiving members 30a, 30b are connected to each other by the connecting member 70, a hardening fluid can be injected into the gap between the second inner circumferential surface 44 and the head 54 in the hole 40 and the gap between the insertion portion 72, 72 and the storage portion 32, 32, and the hardening fluid can be hardened (for example, see FIG. 27(b)). As a result, when the hardening fluid is injected into these positive gaps, the connecting member 70 and the receiving members 30a, 30b are more firmly connected, and the joint strength between the precast RC floor slabs 1, 1 can be improved. In addition, since the gap between the insertion portion 72 and the storage portion 32 exists throughout the entire depth direction of the storage portion 32, when the receiving members 30a, 30b are connected to each other by the connecting member 70, it is also possible to inject the hardening fluid so as to fill all the gaps in the storage portion 32, and the insertion portion 22 can be fixed more firmly than when it is inserted into the storage portion 32.

[0091] The joint of the present invention can also be used when connecting precast RC decks 1a and 1b at different heights. In such a case, a stepped washer 90 is used as an intermediate member to adjust the step. That is, a stepped washer 90 (see FIG. 13) for adjusting the step is placed on the inner bottom of the lower receiving member 30a or 30b's storage section 32. In this case, by setting the thickness of the stepped washer 90 to match the step between the height positions of the precast RC decks 1a and 1b, it becomes possible to perform positioning by adjusting the step in the Z direction between the receiving members 30a and 30b. In addition, the thickness may be adjusted by adjusting the thickness of one stepped washer 90 to match the step, or multiple stepped washers 90 may be stacked to match the overall thickness to the step. In the following, the structure and role of the stepped washer 90 will be explained using the position adjustment installation member 20, but the position adjustment installation member 20 can be interpreted as the connecting member 70, and in this case, the step adjustment mechanism can be understood as an explanation of the step adjustment between the receiving members 30a, 30b and the connecting member 70.

[0092] The stepped washer 90 is a generally annular washer-like member having a hole in the center through which the shaft portion 102 is inserted. The stepped washer 90 also regulates the depth to which the insertion portion 22 enters the receiving portion 32 by its thickness.

[0093] Fig. 13 is a diagram showing a procedure for adjusting the step between the receiving members 30a, 30b to position them, and shows in cross section the relative positional relationship between the position adjustable installation member 20 and the receiving members 30a, 30b. Here, the receiving member 30b is connected to the receiving member 30a with a step of height H, and as shown in Fig. 13(a), before the step adjustment, the receiving member 30b is located at a height h (h>H) lower than the height H relative to the receiving member 30a.

[0094] A stepped washer 90 is placed in advance on the inner bottom of the accommodation portion 32 of the receiving member 30b. The stepped washer 90 used here is one that creates a thickness corresponding to the step caused by positioning. That is, the stepped washer 90 used has a thickness corresponding to the height H. The stepped washer 90 is not limited to one piece, and multiple pieces may be placed inside the accommodation portion 32 so that they overlap until the total thickness reaches the height H.

[0095] When the receiving members 30a, 30b are positioned by the position-adjustable installation member 20, the insertion portions 22 are inserted into the receiving members 30a, 30b as shown in FIG. 13(b). In the receiving member 30a, the lower end face of the insertion portion 22 abuts against the inner bottom of the accommodation portion 32. In the receiving portion 30b, the insertion portion 22 is restricted from entering at a position where the accommodation portion 32 is sandwiched by a stepped washer 90.

[0096] In this state, a torque in the fastening direction is applied to the female-threaded body 110. At this time, the male-threaded body 100 has the long side portion 104b of the pressing portion 104 shown in Fig. 13(b) restricted from rotating within the restricting recess 60 of the receiving member 30b. Therefore, the male-threaded body 100 is displaced axially relative to the female-threaded body 110, and the pressing portion 104 presses the lower end surface of the receiving member 30b.

[0097] As a result, the receiving member 30b is pressed by the pressing portion 104 and displaced in the axial direction. The receiving member 30b is displaced in the axial direction, and the lower end surface of the insertion portion 22 (guiding portion 22c) comes into contact with the stepped washer 90 arranged on the inner bottom portion of the accommodation portion 32 of the receiving member 30b.

[0098] 13(c), one of the insertion portions 22 of the position adjustable installation member 20 abuts against the inner bottom of the accommodation portion 32 of the receiver member 30a, and the other insertion portion 22 abuts against the stepped washer 90 arranged in the accommodation portion 32 of the receiver member 30b. Therefore, the receiver member 30b is positioned at a lower position by the thickness of the stepped washer 90 relative to the receiver member 30a.

[0099] After positioning, torque is additionally applied to the female threaded body 110 in the fastening direction to break the breakable portion 102a, remove the male threaded body 100 from the bridging portion 24, and fix the inserted portions 22, 22 and the receiver members 30a, 30b with the bolts 50, 50. Of course, as described above, the position-adjustable installation member 20 may be removed, the connecting member 70 may be inserted into the receiver members 30a, 30b, and the receiver members 30a, 30b and the inserted portions 72, 72 may be fixed with the bolts 50, 50.

[0100] When connecting the receiving members 30a, 30b with the position adjustable erection member 20, as shown in Fig. 14, after the male threaded body 100 is pulled out from the bridging portion 24, the bolts 50, 50 are inserted into the through holes 40, 40 of the insertion portions 22, 22, and the male threaded portions 52, 52 are screwed into the female threaded holes 36, 36 to fasten the receiving members 30a, 30b and the position adjustable erection member 20. Of course, after connecting the receiving members 30a, 30b with the position adjustable erection member 20, a hardening fluid can be poured into and hardened in gaps such as positive gaps between the receiving members 30a, 30b and the precast RC floor slabs 1a, 1b and between the receiving portions 32, 32 into which the insertion portions 22, 22 are inserted.

[0101] Positioning in the height direction using the stepped washer 90 is also effective when the receiver member 30b, which is above the receiver member 30a shown in Fig. 15(a), is finally positioned below the receiver member 30a. In this case, the stepped washer 90 is placed in advance in the receiving portion 32 of the receiver member 30b, and the insertion portions 22, 22 are inserted into the receiving portions 32 of the receiver members 30a, 30b, respectively. As shown in Fig. 15(b), the lower end of the insertion portion 22 inserted into the receiver member 30b abuts against the upper surface of the stepped washer 90. At this time, the insertion portion 22 in the receiving portion 32 of the receiver member 30a is inserted halfway in the depth direction of the receiving portion 32 of the receiver member 30a.

[0102] When torque in the fastening direction is applied to the female-threaded body 110 from this state, the long side portion 104b of the pressing portion 104 abuts against the first restricting portion 62 in the restricting recess 60 of the receiver 30a, as shown in Fig. 15(b), and rotation is restricted. Therefore, the male-threaded body 100 is displaced axially relative to the female-threaded body 110, and the pressing portion 104 presses the lower end surface of the receiver 30a. Meanwhile, the female-threaded body 110 presses the position adjustment erection member 20, and the position adjustment erection member 20, together with the receiver 30b, descends relative to the receiver 30a.

[0103] As a result, as shown in FIG. 15(c), the receiving member 30b is lowered to a position where its lower end surface abuts against the pressing portion 104, and the receiving members 30a, 30b are aligned at approximately the same height.

[0104] Next, the position adjustable installation member 20 or the connecting member 70 is fastened to the receiving members 30a, 30b with the bolts 50, 50. For example, when the position adjustable installation member 20 is removed and the connecting member 70 is inserted, the lower end of the insertion portion 72 of the connecting member 70 that is inserted into the accommodation portion 32 of the receiving member 30a is separated from the inner bottom surface of the accommodation portion 32 as shown in FIG.

[0105] To fix the connecting member 70 and the receiving members 30a, 30b with the bolts 50, 50, the bolts 50, 50 are inserted through the holes 80, 80 of the insertion portions 72, 72, and the male threaded portions 52, 52 are screwed into the female threaded holes 36, 36, respectively, to fasten them. When the bolt 50 is screwed into the female threaded hole 36 of the receiving member 30a, the connecting member 70 and the receiving member 30b are lowered together relative to the receiving member 30a, and the inner bottom surface of the receiving portion 32 of the receiving member 30a comes into contact with the lower end of the insertion portion 72, as shown in FIG. 16(b). This is because the connecting member 70 is drawn toward the inner bottom surface of the receiving portion 32 of the receiving member 30a as the bolt 50 is screwed forward.

[0106] As a result, the receiving member 30b is positioned below the receiving member 30a by the thickness H of the stepped washer 90, and the connecting member 70 connects the receiving members 30a, 30b.

[0107] In this way, by using the stepped washer 90, even if the receiving member 30b is positioned higher than the receiving member 30a, the receiving members 30a, 30b can be positioned and connected at an appropriate step by positioning using the position adjustment installation member 20 and screwing the bolts 50, 50 into the female threaded holes 36, 36.

[0108] The shape of the stepped washer 90 may be any shape that allows at least the bolt 50 to be inserted and supports the inserted portion, and may be, for example, a flat washer shape, a spring washer shape, a disc spring washer shape, a toothed washer shape, a spherical washer shape, etc.

[0109] When the position adjustment erection member is used for the purpose of removal, it may be a position adjustment erection member 120 provided with removal means 130 to which a lifting means (not shown) can be connected, as shown in Fig. 17. The position adjustment erection member 120 differs from the position adjustment erection member 20 in that it is provided with the removal means 130 and in that the insertion portions 22, 22 are not provided with through holes, etc.

[0110] The removal means 130 has, for example, a shape that is easy for an operator to grasp, or a shape that a hook or a hanging metal fitting can be hooked on, and has an arch shape or a ring shape including a hooking portion. The removal means 130 is disposed at a position where it is easy to remove from the receiving members 30a, 30b by pulling it up. For example, it can be disposed on the upper end surface of each insertion portion 22 of the position adjustment erection member 120 as two positions symmetrical with respect to the center of the position adjustment erection member 120 in the X direction. The removal means 130 may be disposed on the upper end surface of the bridge portion 24. Of course, the position of the removal means 130 is not necessarily limited to two positions, and it may be one position or three or more positions, and it is also possible to provide the removal means 130 on each of the insertion portions 22, 22 and the bridge portion 24.

[0111] The removal means may be configured to be detachable from the insertion parts 22, 22 of the position adjustable installation member 20. For example, as shown in Fig. 18, the removal means 140 may be configured to be screwed into the through holes 40, 40 of the insertion parts 22, 22 and provided detachably. That is, the removal means 140 may be configured to have a male-threaded shaft body 142 fixed to the through hole 40, and a hook part 144, such as a ring-shaped hook part, formed on one end of the shaft body 142.

[0112] Furthermore, in order to enable screwing and fixing of the removal means 140, the first inner circumferential surface 42 of the through hole 40 may be provided with a female screw helical groove capable of screwing into the shaft body 142. The range in which the male screw of the shaft body 142 and the female screw of the first inner circumferential surface 42 are formed is set so that the shaft body 142 can extend to the outside of the through hole 40. Furthermore, since the shaft body 142 screws into the first inner circumferential surface 42, it is configured so that it cannot screw into the female screw hole 36, which can be realized, for example, by setting the diameter of the male screw portion of the shaft body 142 to be sufficiently larger than the female screw hole 36.

[0113] Furthermore, the number of receiving members 30 arranged on the precast RC slab is not particularly limited, and can be set appropriately depending on the size of the precast RC slab, etc. Furthermore, the order of positioning when positioning the precast RC slab with multiple joints 10 can be set appropriately, and for example, positioning may be performed sequentially from one end of the precast RC slab to the other end, or from a middle position to the ends, or only other appropriate portions may be positioned. Furthermore, positioning may be performed from both ends toward the middle position substantially simultaneously or alternately.

[0114] Next, a method for connecting precast RC slabs 1a and 1b using only the position-adjustable erection member 20 will be described with reference to the flowchart shown in Fig. 19. Note that the connecting construction is started in a state where the precast RC slabs 1a and 1b are arranged facing each other in advance. As described above, the precast RC slab 1a is fixed, and the precast RC slab 1b is displaceable. Before connecting the receiving members 30a, 30b with the position adjustable erection member 20, it is confirmed whether or not the precast RC floor slabs 1a, 1b are to be connected with a step (step S1). If the check results in a connection with a step (step S1, Yes), a stepped washer 90 is placed on the bottom surface of the accommodation portion 32 of the receiving member 30 that is placed on the lower side due to the step (step S2), and the process proceeds to the next step S3. If the check results in a connection with no step (step S1, No), the process proceeds to the next step S3 without placing the stepped washer 90.

[0115] Next, the position adjustable erection member 20 is arranged (step S3). That is, the position adjustable erection member 20 is positioned above and between the receiving members 30a, 30b, and the insertion portion 22 is inserted into the receiving members 30a, 30b.

[0116] Thereafter, the male threaded body 100 and the female threaded body 110 are fastened together to position the receiving member 30b and the precast RC deck 1b (step S4). That is, a torque is applied to the female threaded body 110 in the fastening direction, and the receiving members 30a, 30b and the connecting portion 20 are pressed and fastened between the pressing portion 104 and the female threaded body 110. The force caused by this tightening not only acts to displace the receiving member 30b in the Z direction, but also is transmitted to the inclined guide surface 34 via the guide portion 22c and converted into a force in the X direction and / or Y direction, and acts to displace the receiving member 30b in the X direction and / or Y direction. This positions the receiving member 30b and the precast RC floor slab 1b.

[0117] Next, the male-threaded body 100 and the female-threaded body 110 are removed (step S5). That is, a torque equal to or greater than a predetermined value is applied to the female-threaded body 110 to apply an axial force to the male-threaded body 100, thereby breaking the easily breakable portion 102a and separating the shaft portion 102. Of the male-threaded body 100, the shaft portion 102 to which the female-threaded body 110 is screwed is pulled out and removed from the position adjustable erection member 20, and the fragments of the broken shaft portion 102 and the pressing portion 104 are recovered by a recovery means from above the dam means disposed below between the precast RC floor slabs 1a and 1b.

[0118] Next, the position adjustment erection member 20 and the receiving members 30a, 30b are fixed together (step S6). That is, the bolts 50, 50 are inserted into the through holes 40, 40 of each insertion portion 22, 22, and the male threaded portions 52, 52 are screwed into the female threaded holes 36, 36, respectively. This fixes the position adjustment erection member 20 (the insertion portions 22, 22) and the receiving members 30a, 30b together.

[0119] Then, it is confirmed whether all the receiving members 30a, 30b are connected to each other by the position adjustable erection members 20 (step S7). When it is confirmed that there is a portion between the receiving members 30a, 30b where no position adjustable erection member is arranged and they are not connected (step S7, No), the process proceeds to step S1, and in order to connect the other receiving members 30a, 30b, the steps shown in steps S1 to S6 are carried out, such as arranging the stepped washers 90 according to the presence or absence of a step, arranging the position adjustable erection members 20, positioning the receiving members 30b and the precast RC deck 1b, removing the male threaded body 100 and the female threaded body 110, and fixing the position adjustable erection members 20 and the receiving members 30a, 30b.

[0120] Thereafter, after confirming that all of the receiving members 30a, 30b have been connected to each other by the position adjustable erection members 20 (step S7, Yes), a hardening fluid is injected into the gaps between the insertion parts 22 and the receiving members 30, the gaps between the precast RC floor slabs 1a, 1b, etc. (step S8). The hardening fluid is then hardened in each gap, completing the construction of connecting the precast RC floor slabs 1a, 1b using only the position adjustable erection members 20.

[0121] Next, a method for connecting precast RC floor slabs 1a, 1b using a position adjustable erection member 20 and a connecting member 70 will be described with reference to the flowchart shown in Figure 20. Here, when the precast RC floor slab 1a and the precast RC floor slab 1b are arranged side by side, if the connecting member 70 can be inserted into the space between the opposing receiving members 30a, 30b, the connecting member 70 is inserted, and the position adjustable erection member 20 is inserted in places where the connecting member 70 cannot be inserted.

[0122] First, it is confirmed whether the precast RC floor slabs 1a, 1b are to be connected with a step (step SA1). If the confirmation result indicates that the precast RC floor slabs 1a, 1b are to be connected with a step (step SA1, Yes), a stepped washer 90 is placed on the bottom surface of the receiving portion 32 of the receiving member 30 located on the lower side due to the step (step SA2), and the process proceeds to the next step SA3. If the confirmation result indicates that the precast RC floor slabs 1a, 1b are to be connected with a step (step SA1, No), the process proceeds to the next step SA3 without placing the stepped washer 90.

[0123] Then, it is confirmed whether the receiving members 30a, 30b are arranged facing each other with a distance allowing the connecting member 70 for fixing to be inserted (step SA3), and if the connecting member 70 cannot be inserted (step SA3, No), the position adjusting installation member 20 is arranged (step SA4). That is, the position adjusting installation member 20 is positioned above the receiving members 30a, 30b, and the insertion portions 22, 22 are inserted into the receiving members 30a, 30b, respectively.

[0124] Next, the male threaded body 100 and the female threaded body 110 are fastened together to position the receiving member 30b and the precast RC deck 1b (step SA5). That is, a torque in the fastening direction is applied to the female threaded body 110, and the receiving members 30a, 30b and the connecting portion 20 are pressed and fastened between the pressing portion 104 and the female threaded body 110. This displaces the receiving member 30b in the X direction, Y direction, and / or Z direction to position the receiving member 30b and the precast RC deck 1b.

[0125] Next, the male-threaded body 100 and the female-threaded body 110 are removed (step SA6). That is, a torque of a predetermined value or more is applied to the female-threaded body 110 to break the easily breakable portion 102a. The shaft portion 102 to which the female-threaded body 110 is screwed is pulled out and removed from the position-adjustable erection member 20, and the fragments of the broken shaft portion 102 and the pressing portion 104 are collected by a collection means from above the dam means disposed below between the precast RC slabs 1a and 1b.

[0126] Next, the position adjustable erection member 20 and the receiving members 30a, 30b are fixed together (step SA7). That is, the bolts 50, 50 are inserted into the through holes 40, 40 of each of the insertion portions 22, 22, and the male threaded portions 52, 52 are screwed into the female threaded holes 36, 36, respectively, to fasten them together. Thus, the position adjustable erection member 20 (the insertion portion 22) and the receiving members 30a, 30b are fixed together.

[0127] Next, in step SA3, if the connecting member 70 can be inserted (step SA3, Yes), the connecting member 70 is placed (step SA8). That is, the connecting member 70 is inserted from above the receiving members 30a, 30b, and the insertion portions 72, 72 are inserted into the receiving members 30a, 30b, respectively.

[0128] Then, the connecting member 70 and the receiving members 30a, 30b are fixed together (step SA9). That is, the bolts 50, 50 are inserted into the through holes 80, 80 of each of the insertion portions 72, 72, and the male threaded portions 52, 52 are screwed into the female threaded holes 36, 36, respectively, to fix the connecting member 70 (insertion portion 72) and the receiving members 30a, 30b together.

[0129] Next, after the position adjustment installation member 20 and the receiving members 30a, 30b are fixed in step SA7, or after the connecting member 70 and the receiving members 30a, 30 are fixed, it is confirmed whether or not all of the receiving members 30a, 30b are connected to each other (step SA10). If there are unconnected receiving members 30a, 30b (step SA10, No), the process proceeds to step SA1.

[0130] When it is confirmed that all of the receiving members 30a, 30b have been connected by the position adjustable erection members 20 or the connecting members 70 (step SA10, Yes), a hardening fluid is injected into the gaps between the insertion parts 22 and the receiving members 30, the gaps between the precast RC floor slabs 1a, 1b, etc. (step SA11). Then, the hardening fluid is hardened in each gap to complete the construction of connecting the precast RC floor slabs 1a, 1b using the position adjustable erection members 20 or the connecting members 70.

[0131] Next, a connection construction method for connecting the precast RC floor slabs 1a, 1b, in which after positioning using the position adjustable erection member 20, the position adjustable erection member 20 is pulled out and connected using the connecting member 70, will be described with reference to the flowchart shown in FIG.

[0132] First, it is confirmed whether the precast RC floor slabs 1a, 1b are to be connected with a step (step SB1). If the confirmation result is that they are to be connected with a step (step SB1, Yes), a stepped washer 90 is placed on the bottom surface of the receiving portion 32 of the receiving member 30 located on the lower side due to the step (step SB2), and the process proceeds to the next step SB3. If the confirmation result is that they are to be connected without a step (step SB1, No), the process proceeds to the next step SB3 without placing the stepped washer 90.

[0133] Next, it is determined whether or not the position adjusting erection member 20 for positioning is required for the receiving members 30a, 30b to be connected (step SB3). For example, when the relative position of the receiving member 30b with respect to the receiving member 30a is deviated from the appropriate position, it is determined that the position adjusting erection member 20 is required (step SB3, Yes), and the position adjusting erection member 20 is arranged (step SB4). That is, the position adjusting erection member 20 is positioned above the receiving members 30a, 30b, and the insertion portions 22, 22 are inserted into the receiving members 30a, 30b, respectively.

[0134] Next, the male threaded body 100 and the female threaded body 110 are fastened to position the receiving member 30b and the precast RC deck 1b (step SB5). That is, a torque in the fastening direction is applied to the female threaded body 110, and the receiving members 30a, 30b and the position adjustable erection member 20 are pressed and fastened between the pressing portion 104 and the female threaded body 110. This displaces the receiving member 30b in the X direction, Y direction, and / or Z direction to position the receiving member 30b and the precast RC deck 1b.

[0135] Next, the position adjustable erection member 20 is replaced with the connecting member 70 (step SB6). That is, the position adjustable erection member 20 is removed, and the connecting member 70 is inserted in its place. The removal of the position adjustable erection member 20 will be described later.

[0136] Then, the connecting member 70 and the receiving members 30a, 30b are fixed together (step SB7). That is, the bolts 50, 50 are inserted into the through holes 80, 80 of each insertion portion 72, 72, and the male threaded portions 52, 52 are screwed into the female threaded holes 36, 36 for fastening. Thus, the connecting member 70 and the receiving members 30a, 30b are fixed together.

[0137] On the other hand, when it is determined in step SB3 that the position adjustment installation member 120 for positioning is not necessary (step SB3, No), the insertion portions 72, 72 of the connecting member 70 are inserted into the accommodating portions 32, 32 of the receiving members 30a, 30b and inserted into the receiving members 30a, 30b (step SB8).

[0138] After the connecting member 70 is inserted into the receiving members 30a, 30b, the process proceeds to step SB7, where the connecting member 70 and the receiving members 30a, 30b are fixed together.

[0139] After the connecting member 70 and the receiving members 30a, 30b are fixed in step SB7, it is checked whether or not all of the receiving members 30a, 30b have been connected to each other (step SB9). If there are any receiving members 30a, 30b that have not been connected (No in step SB9), the process returns to step SB1 and each process for connecting the receiving members 30a, 30b to each other is performed.

[0140] When it is confirmed that all of the receiving members 30a, 30b have been connected by the connecting members 70 (step SB9, Yes), a hardening fluid is injected into the gaps between the insertion portions 22 and the receiving members 30, the gaps between the precast RC floor slabs 1a, 1b, etc. (step SB10). Then, the hardening fluid is hardened in each gap, completing the construction of connecting the precast RC floor slabs 1a, 1b using the connecting members 70.

[0141] An example of a process for removing the position adjusting erection member 20 will be described with reference to the flowchart of Fig. 22. In order to remove the position adjusting erection member 20 from the receiving members 30a, 30b, the female threaded body 110 is loosened relative to the male threaded body 100 (step SC1). That is, a torque in a loosening direction is applied to the female threaded body 110 to displace the male threaded body 100 in the axial direction, and the pressing portion 104 is displaced to a position where it does not interfere with the second restricting portion 64.

[0142] Next, the female-threaded body 110 is rotated in the loosening direction, and the pressing portion 104 is rotated so as not to interfere with the receiving members 30a, 30b (step SC2). That is, when the pressing portion 104 is in a position where it does not interfere with the second restricting portion 64, the male-threaded body 100 rotates together with the female-threaded body 110, so that the pressing portion 104 rotates approximately 90° and disengages from the restricting recess 60. As a result, the short side portion 104a of the pressing portion 104 is oriented approximately parallel to the bridge portion 24 as shown in FIG. 11(a), and the rotation of the pressing portion 104 is restricted.

[0143] Next, the male threaded body 100 is pulled up (step SC3). When the position adjusting erection member 20 is thereby lifted up to the outside of the receiving members 30a, 30b and removed from the receiving members 30a, 30b (step SC4, Yes), removal of the position adjusting erection member 20 is completed.

[0144] On the other hand, when the position adjustable installation member 20 cannot be lifted because it is caught on the receiving members 30a, 30b and cannot be removed from the receiving members 30a, 30b (No in step SC4), the removal means 140 is attached to each of the insertion portions 22, 22 (step SC5). Specifically, the shaft body 142 is screwed into the first inner peripheral surface 42 of the through hole 40 of each insertion portion 22, and the shaft body 142 is alternately and gradually screwed into both through holes 40 of the position adjustment installation member 20, for example, to attach the removal means 140 to the through holes 40 as shown in Fig. 23. Of course, when attaching the removal means 140 to both through holes 40, the method is not limited to alternately and gradually screwing the removal means 140, and it goes without saying that the shaft body 142 may be screwed into both through holes 40 at the same time.

[0145] The removal means 140 is screwed against the first inner circumferential surface 42, thereby forcing its tip into the inner bottom surfaces of the receiving members 30a, 30b, and the reaction force displaces the position adjustment erection member 20 upward (step SC6). That is, the hook portion 144 of the removal means 140 is rotated to screw the shaft body 142 into the through hole 40, and the lower end of the shaft body 142 protrudes from the through hole 40 toward the inner bottom side of the accommodation section 32. As a result, as shown in FIG. 24, the shaft body 142 presses against the inner bottom of the accommodation section 32 to lift the position adjustment erection member 20, and as a result, the position adjustment erection member 20 is displaced upward relative to the receiving member 30. When the removal means 140 are screwed against the first inner circumferential surface 42 in step SC6, both removal means 140 may be screwed alternately and gradually, or both removal means 140 may be screwed simultaneously.

[0146] After displacing the position adjustment erection member 20 upward, the male threaded body 100 is pulled up or a hanging bracket or the like is hung on the hook portion 144 to lift the position adjustment erection member 20, thereby pulling the position adjustment erection member 20 out of the receiving members 30a, 30b (step SC7), thereby completing the removal of the position adjustment erection member 20.

[0147] As described above, by providing the removal means 140, the position adjustable erection member 20 can be easily removed. That is, if the position adjustable erection member 20 cannot be removed from the receiving members 30a, 30b even when the male threaded body 100 is pulled up, the shaft body 142 of the removal means 140 can be screwed into the first inner circumferential surface 42 to relatively raise the insertion portion 22 within the accommodation portion 32, making it easier to remove. Furthermore, since a hanging metal fitting or the like can be hooked onto the hook portion 144 of the removal means 140, it can also be pulled up by a lifting means such as a winch.

[0148] It is desirable to set the thread length, etc., of the shaft body 142 of the removal means 140 so that the insertion portion 22b is displaced upward to a position where it cannot slide against the inner circumferential surface of the accommodating portion 32. That is, as shown in Fig. 26, the thread length, etc. of the shaft body 142 is set so that when the shaft body 142 is screwed into the first inner circumferential surface 42, the insertion portion 22b is raised to the height position of the inclined guide surface 34 of the accommodating portion 32. For example, the thread length of the shaft body 142 can be set to a length equivalent to the distance in the Z direction within a range in which the insertion portion 22b can slide against the inner circumferential surface of the accommodating portion 32.

[0149] The hardening fluid is injected into the gap between the second inner circumferential surface 44 and the head 54 in the hole 40, but since the hardening fluid cannot flow between the male thread portion 52 and the first inner circumferential surface 42, a hole may be provided in the gap adjusting washer 56 and the hardening fluid may be allowed to flow between the male thread portion 52 and the first inner circumferential surface 42 through the hole. In this way, by filling the gap with the hardening fluid, it is possible to improve the strength connecting the receiving members 30a, 30b and the joint strength between the precast RC decks 1a, 1b.

[0150] In addition, when placing and connecting a precast RC slab to a road bridge using the joint of the present invention, the construction start position and the construction progress direction, etc., can be set appropriately. For example, as shown in FIG. 25(a), one end of the road bridge may be set as the construction start position, and the direction from the construction start position toward the other end may be set as the construction progress direction. In summary, first, a precast RC slab is fixed to one end of the road bridge. Next, another precast RC slab adjacent to the precast RC slab is placed on the other end side, and both precast RC slabs are connected and fixed using the joint of the present invention. In this way, construction may be performed by fixing a precast RC slab to one end of the road bridge, and then placing and fixing new precast RC slabs sequentially toward the other end.

[0151] Also, as shown in FIG. 25(b), both ends of the road bridge may be set as the construction start positions, and the direction from the construction start positions toward the center may be set as the construction progress direction. In summary, first, a precast RC slab is fixed to each end of the road bridge. Next, another precast RC slab is placed at a position adjacent to the precast RC slab fixed at one end at the center, and both precast RC slabs are connected and fixed by the joint of the present invention. The same process is performed at the other end. In this way, construction may be performed by fixing a precast RC slab to each end of the road bridge, and then placing and fixing new precast RC slabs sequentially from one end and the other end toward the center.

[0152] Also, the center of the road bridge shown in FIG. 25(c) can be set as the construction start position, and the direction from the construction start position toward both ends can be set as the construction progress direction. In summary, first, a precast RC slab is fixed to the center of the road bridge. Next, another precast RC slab is placed adjacent to the fixed precast RC slab at one end, and both precast RC slabs are connected and fixed by the joint of the present invention. Similarly, another precast RC slab is placed adjacent to the precast RC slab fixed to the center at the other end, and both precast RC slabs are connected and fixed by the joint of the present invention. In this way, a precast RC slab may be fixed to the center of the road bridge, and new precast RC slabs may be placed and fixed sequentially from the center toward both ends.

[0153] Also, the center and both ends of the road bridge shown in FIG. 25(d) can be set as the construction start positions, the direction from the center toward both ends can be set as the construction progress direction, and the direction from both ends toward the center can be set as the construction progress direction. In summary, first, precast RC slabs are fixed to the center and both ends of the road bridge. Next, other precast RC slabs are placed adjacent to the precast RC slab fixed at the center on both ends, and each precast RC slab is connected and fixed to the fixed precast RC slab. Also, another precast RC slab is placed adjacent to the center of the precast RC slab fixed at one end, and connected and fixed to the fixed precast RC slab. The same process is performed on the precast RC slab fixed at the other end. In this way, precast RC decks are fixed to the center and both ends of the road bridge, and new precast RC decks can be placed and fixed sequentially at one end and the other end of the precast RC deck fixed to the center, and new precast RC decks can be placed and fixed sequentially toward the center for each precast RC deck fixed at both ends.

[0154] Depending on the position of the receiving member 30 on the precast RC floor slab 1, when two receiving members 30 are connected by the connecting portion 20, the gap width between adjacent precast RC floor slabs 1, 1 can be set extremely small. In other words, by arranging the receiving member 30 on the inside in the X direction from the side end face of the precast RC floor slab 1, the gap between the precast RC floor slabs 1a, 1b can be narrowed.

[0155] For example, when the receiving member 30 is positioned inwardly from the side portion along the X direction by a length equivalent to approximately half the X-direction length of the bridging portion 24, the precast RC decks 1a, 1b can create a space between the receiving members 30a, 30b in which the bridging portion 24 can be accommodated, even though the end faces of the precast RC decks 1a, 1b approximately overlap each other.

[0156] The members to be joined, in which the receiving members are embedded or otherwise installed, are not limited to precast RC slabs. The members to be joined are not limited in material or shape, and can be applied to any members as long as the members to be joined can be joined by connecting the receiving members with a connecting member. The materials of the members to be joined can be, for example, concrete, ceramics, glass, metal, synthetic resin, natural resin, wood, or various composite materials. The shapes of the members to be joined can be, for example, plate-shaped, column-shaped, block-shaped, or the like, and can be applied to joining members of the same type or different types of members. In addition, the method can be applied to all kinds of goods, components, and objects, such as precast concrete members in general, furniture in general, building materials, housing frame materials, and various machines. In addition, the joint of the present invention is not limited to use for positioning of components to be joined, one of which is fixed and the other of which is displaceable, but can also be used in cases where both of the components to be joined can be displaced. In other words, when the insertion portion of the position-adjusting installation member is inserted, both receiving members can be displaced.

[0157] In addition, the removal means has been described as having a ring-shaped or similar hook portion 144 on one end of the male-threaded shaft body 142, but the removal means may also be provided with a head portion shaped to engage with a fastening tool such as a wrench in the circumferential direction, instead of hook portion 144, as long as it is at least possible to transmit torque to the shaft body 142.

[0158] 29 is a perspective view showing another example of removal means 150. The removal means 150 may be a so-called bolt-like member having a shaft body 152 with a male screw helical groove and a head 154 such as a hexagonal head. The shaft body 152 is configured to screw into the female screw of the first inner circumferential surface 42 like the shaft body 142, but cannot screw into the female screw hole 36. The head 154 has an outer diameter shape that is expanded radially more than the shaft body 152, and transmits the torque applied from the fastening tool to the shaft body 142.

[0159] According to such a removal means 150, when the position adjustment installation member 20 cannot be removed from the receiving members 30a, 30b even when an attempt is made to pull up the male threaded body 100, the shaft body 152 can be screwed into the first inner surface 42, as in the case where the removal means 140 is used, so that the insertion portion 22 is relatively raised within the accommodating portion 32, making it easier to remove.

[0160] Specifically, when a torque is applied to the head 154 by the fastening tool, the removal means 150 screws against the first inner circumferential surface 42. That is, the head 154 rotates to screw the shaft 152 into the through hole 40, causing the lower end of the shaft 152 to protrude from the through hole 40 toward the inner bottom side of the accommodation section 32. The shaft body 152 presses against the inner bottom of the accommodation portion 32 , and the reaction force displaces the position adjustable installation member 20 upward relative to the receiving member 30 .

[0161] Then, after the position adjustment erection member 20 is displaced upward, the male screw body 100 and the removal means 150 are pulled up, whereby the position adjustment erection member 20 can be pulled out from the receiving members 30a, 30b.

[0162] The shape of the head 154 is not limited to a hexagonal head, and may be a polygonal shape such as a substantially triangular or substantially square shape in plan view, as well as a substantially circular, substantially elliptical, or substantially oval shape. Other possible shapes include a bind head, a truss head, a countersunk head, a round countersunk head, and a pan head. Furthermore, the top surface of the head may be formed with a polygonal hole such as a triangular, square, or hexagonal hole, a star-shaped hole, a slot, a plus or minus hole, or the like.

[0163] In the above description, the positioning and erection of the two receiver members 30a, 30b are performed simultaneously by the position adjusting erection member 20, but the present invention is not limited to this, and the receiver members 30a, 30b may be erected by inserting the connecting member 70 into the two receiver members 30a, 30b without performing positioning by the position adjusting erection member 20. In this case, the dimensions and relative positions of the receiving portion 32 and the insertion portion 72 are adjusted so that there is a positive gap when the insertion portion 72 is inserted into the receiving portion 32 of the receiver members 30a, 30b.

[0164] The above-mentioned configuration also improves the workability of erecting road bridge decks together, and even if there are large errors due to dimensional deviations, positional deviations, deformation, etc. from the design drawings for each site where the joining work is performed, or due to distortion or twisting of the road bridge deck, these errors can be absorbed by so-called on-site adjustment at the site where the joining work is performed, allowing for flexible response and construction with a high degree of freedom, as well as significantly improving workability and significantly shortening the time required for joining road bridge decks together, while at the same time making it possible to reduce the number of people required, shorten the construction period, and achieve higher strength and durability. [Explanation of symbols]

[0165] 1...precast RC deck, 10...joint, 20...position adjustable installation member, 22...insertion portion, 22a...insertion escape portion, 22b...insertion portion, 22c...guiding portion, 24...bridging portion, 30a, 30b...receiving member, 31...anchor mounting hole, 32...accommodating portion, 34...inclined guide surface, 36...female threaded hole, 38...engagement portion, 40...hole, 42...first inner circumferential surface, 44...second inner circumferential surface, 46...support surface, 50...bolt, 52...male threaded portion, 54...head, 60...regulating recess, 62...first regulating portion, 64...second regulating portion, 70...connecting member, 100...male threaded body, 102...shaft portion, 102a...easy breaking portion, 104...pressure portion, 104a...short side portion, 104b...long side portion, 110...female threaded body.

Claims

1. A joint for connecting a pair of decks having a receiving member arranged on the deck and an installation member connecting the receiving members, The receiving member has a housing portion and an engagement portion that engages with a bridging member inserted into the housing portion, The bridging member has a pair of insertion portions that are inserted into the housing portion and a bridge portion that connects the insertion portions, A joint characterized in that a height adjustment member capable of adjusting a step for positioning the pair of deck slabs at different height positions is arranged in the accommodation portion.

2. 2. The joint according to claim 1, wherein the height adjustment member is a stepped washer.

3. A joint for connecting a pair of decks having a receiving member arranged on the deck and an installation member connecting the receiving members, The receiving member has a housing portion and an engagement portion that engages with a bridging member inserted into the housing portion, The bridging member has a pair of insertion portions that are inserted into the housing portion and a bridge portion that connects the insertion portions, A height adjustment member that can be placed in the storage portion, A joint characterized in that the height adjustment member regulates the accommodation depth of the insertion portion within the accommodation portion.

4. 4. The joint according to claim 3, wherein the height adjustment member is a stepped washer.

5. The storage section is formed with a bottom, 3. The joint according to claim 1 or 2, characterized in that the height adjustment member is capable of being arranged on an inner bottom portion of the receiving portion.

6. The storage section is formed with a bottom, 5. A joint according to claim 3 or claim 4, characterized in that the stepped washer can be arranged on an inner bottom part of the receiving part.

7. The insertion portion has a through hole through which a bolt is inserted, The receiving member has a female threaded hole into which the bolt is screwed, 5. The joint according to claim 1, wherein the insertion portion is fixed to the receiving member by screwing the bolt, which is inserted into the through hole, into the female threaded hole.

8. The storage section is formed with a bottom, The height adjustment member can be disposed on an inner bottom portion of the storage portion, The insertion portion has a through hole through which a bolt is inserted, The receiving member has a female threaded hole into which the bolt is screwed, 3. A joint as described in claim 1 or claim 2, characterized in that the insertion portion is fixed to the receiving member via the height adjustment member between the inner bottom portion and the insertion portion by screwing the bolt inserted into the through hole into the female threaded hole.

9. The storage section is formed with a bottom, The height adjustment member can be disposed on an inner bottom portion of the storage portion, The insertion portion has a through hole through which a bolt is inserted, The receiving member has a female threaded hole into which the bolt is screwed, 5. A joint as described in claim 2 or claim 4, characterized in that the insertion portion is fixed to the receiving member via the stepped washer between the inner bottom portion and the insertion portion by screwing the bolt inserted into the through hole into the female threaded hole.

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