Reinforcement bar joint unit

Abstract

To make it possible to confirm that a grout material is filled in a pipe connected to a grout discharge port of a reinforcing bar joint of a grout filling type, and to prevent a stopcock fitted to the pipe from coming off from the pipe.SOLUTION: A stopcock 1 is fitted into a pipe 16 connected to a grout discharge port 15 of a reinforcing bar joint 10 of a grout filling type. The stopcock 1 includes a main body 20 having a truncated conical shape, a male thread 22 provided on an outer circumferential surface of the main body 20, and a groove 24 provided on the outer circumferential surface of the main body 20 along the axial direction. By arranging the rod-shaped member 25 in the groove 24 and causing the rod-shaped member 25 to protrude into the inside of the pipe 16, it is possible to confirm whether the pipe 16 is filled with grout material. The air in the pipe 16 is discharged through the groove 24 of the stopcock 1 or a trough 22b of the male thread 22. Also, a peak portion 22a of the male thread 22 bites into the inside of the pipe 16. Therefore, when the filling pressure of the grout material is increased, the stopcock 1 is less likely to come off from the pipe 16.SELECTED DRAWING: Figure 3

Description

Technical Field

[0005]

[0001] This Disclosure relates to a plug for a grout-filled reinforcing bar joint and a reinforcing bar joint unit provided with the same.

Background Art

[0002] In order to seal the opening of a communication pipe (pipe) that communicates with the mortar discharge port of a mortar-filled reinforcing bar joint, a plug that is fitted into the opening is used. As such a plug, one having a plug body, a through hole penetrating the plug body, and a piston body movable within the through hole under the action of mortar pressure is known (for example, Patent Document 1). When the pressure-receiving body formed on the piston body receives the mortar pressure, the piston body within the through hole moves, and the pressure-receiving body is pressed against the plug body, thereby closing the through hole.

[0003] When a mortar-filled reinforcing bar joint is filled with mortar, the mortar enters the through hole of the plug body and solidifies. After the filling of the mortar is completed, it is difficult to remove the solidified mortar in the through hole by removing the plug from the pipe. Therefore, it is difficult to reuse the plug. In order to solve this problem, a plug provided with a notch portion on the outer peripheral surface that communicates the inside and the outside of the discharge hole (opening) has been proposed (Patent Document 2). In the plug described in Patent Document 2, since the notch portion is provided on the outer peripheral surface of the plug, the hardened grout material can be easily removed.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] The stopper described in Patent Document 2 does not allow confirmation of whether or not the grout material has been filled into the pipe. Therefore, in order to confirm that the grout material has been reliably filled, the filling pressure of the grout material may be increased after filling. However, increasing the filling pressure makes the stopper more likely to come off the pipe. Here, one might consider pushing the stopper in firmly to prevent it from coming off. However, if the force used to push the stopper in is too strong, local deformation of the stopper may eliminate the gap that should be defined between the pipe and the stopper by the notch, which may make it difficult for air to be expelled.

[0006] In view of the above background, the present invention aims to provide a solution that allows confirmation that grout material has been filled into the pipe connected to the grout outlet of a grout-filled reinforced bar joint, and to make it difficult for the stopper fitted to the pipe to come off. [Means for solving the problem]

[0007] To solve the above problems, one aspect of the present invention provides a stopper (1, 101, 201) for a grout-filled reinforcing bar joint, comprising a frustoconical body (20), male threads (22, 122, 222) provided on the outer circumferential surface of the body, and grooves (24) provided on the outer circumferential surface of the body along the axial direction.

[0008] In this embodiment, by placing a rod-shaped member in the groove and allowing the rod-shaped member to protrude into the inside of the pipe, it is possible to confirm whether or not the pipe has been filled with grout material. In addition, the threads of the male screw bite into the inside of the pipe. Therefore, when the filling pressure of the grout material is increased, the stopper is less likely to come off the pipe. The air inside the pipe is discharged to the outside through the groove of the stopper or the valley of the male screw.

[0009] Furthermore, in the above embodiment, the stopper may be made of resin. According to this embodiment, when the stopper is removed from the pipe after the grout material has hardened, the grout material adhering to the stopper can be easily removed from the stopper. Therefore, the stopper can be easily reused.

[0010] Furthermore, in the above embodiment, the stopper may further have an engaging portion (21) provided at the rear end (20a) of the main body. In this embodiment, when inserting or removing the stopper, the stopper can be rotated using a tool such as a wrench engaged with the engaging portion. Therefore, inserting and removing the stopper is easy.

[0011] Furthermore, in the embodiment having the above-described engaging portion, the engaging portion is preferably a projection that protrudes from the rear end of the main body and has a non-circular outer surface. According to this embodiment, when inserting or removing the stopper, the worker can grip the engaging portion in a manner that facilitates torque transmission and rotate the stopper. Therefore, it is also possible to insert or remove the stopper without using tools.

[0012] Furthermore, in the above embodiment, it is preferable that the male threads (22, 122) are tapered threads. In this embodiment, the height of the threads is constant from the front end to the rear end of the male threads, and the threads are pointed at any position in the direction of the axis 20X. Therefore, even if there are variations in the tolerance range of the stopper and pipe dimensions, variations due to deformation, or variations due to attached substances, the pointed threads can bite into the inner surface of the pipe, and the stopper can be securely fitted to the pipe.

[0013] Furthermore, in the above embodiment, it is preferable that the male screw (222) is a parallel screw. According to this embodiment, the threading of the male screw is easy. Therefore, the manufacturing cost of the stopper can be reduced.

[0014] Furthermore, in the above embodiment, it is preferable that the male screw (122) is a double-threaded screw. According to this embodiment, the stopper can be fitted to the pipe with fewer rotations compared to the case where the male screw is a single-threaded screw. Therefore, the time required to fit the stopper can be shortened. In addition, when the stopper is fitted to the pipe, the screw grooves communicate with the inside of the pipe at two locations in the circumferential direction, so it is possible to more reliably prevent air from remaining inside the pipe when grout is injected.

[0015] Furthermore, in order to solve the above problems, another aspect of the present invention is a reinforcing bar joint unit (18) comprising a grout-filled reinforcing bar joint (10) having a grout outlet (15), a pipe (16) connected to the grout outlet, and stoppers (1, 101, 201) fitted to the pipe, wherein the stoppers have a frustoconical body portion (20), male threads (22, 122, 222) provided on the outer circumferential surface of the body portion, and grooves (24) provided on the outer circumferential surface of the body portion along the axial direction.

[0016] In this embodiment, by placing a rod-shaped member in the groove and allowing the rod-shaped member to protrude into the inside of the pipe, it is possible to confirm whether or not the pipe has been filled with grout material. In addition, the threads of the male screw bite into the inside of the pipe. Therefore, when the filling pressure of the grout material is increased, the stopper is less likely to come off the pipe. The air inside the pipe is discharged through the groove of the stopper or the valleys of the male screw.

[0017] Furthermore, in the reinforcement joint unit according to the above embodiment, the hardness of the stopper material is preferably the same as or harder than the material of the pipe. According to this embodiment, when the stopper is fitted to the other end of the pipe, the threads of the male screw of the stopper easily bite into the inside of the pipe. Therefore, the stopper is less likely to come off when the filling pressure of the grout material is increased.

[0018] Furthermore, in the reinforcement joint unit of the above embodiment, the thread diameter (D1) of the male screw at the front end (20b) of the main body is preferably smaller than the inner diameter (D2) of the pipe. According to this embodiment, it is easy to insert the stopper into the pipe.

[0019] Furthermore, in the reinforcing bar joint unit of the above embodiment, it is preferable to further include a rod-shaped member (25) arranged in the groove so as to protrude from the main body into the interior of the pipe.

[0020] According to this aspect, when the grout material is filled inside the pipe, the rod-shaped member is pushed by the grout material and protrudes from the pipe, so that the filling of the grout material can be confirmed. Therefore, the operation of inserting the rod-shaped member into the groove to confirm the presence or absence of the filling material is unnecessary.

[0021] Also, in the reinforcing bar joint unit of the above aspect, it is preferable that a large-diameter portion (26) having a diameter larger than that of the rod-shaped member is provided at a portion of the rod-shaped member located inside the pipe.

[0022] According to this aspect, when the rod-shaped member is pushed by the grout material and protrudes from the pipe, the groove is closed by the large-diameter portion. Thereby, leakage of the grout material from the groove can be prevented.

[0023] Also, in the reinforcing bar joint unit of the above aspect, the rod-shaped member preferably has a cross-sectional area that prevents leakage of the grout material from the groove of the grout material filled into the reinforcing bar joint with a predetermined filling pressure.

[0024] According to this aspect, air is discharged from the groove and the valleys of the male threads until the grout material is filled in the pipe, and after the grout material is filled in the pipe, leakage of the grout material from the groove is blocked by the rod-shaped member.

Advantages of the Invention

[0025] According to the above configuration, it is possible to confirm that the grout material is filled in the pipe connected to the grout discharge port of the grout-filled reinforcing bar joint, and it is possible to make it difficult for the plug fitted to the pipe to come off from the pipe.

Brief Description of the Drawings

[0026] [Figure 1] Cross-sectional view of the column member to which the plug of the present invention is applied [Figure 2] Perspective view of the plug according to the first embodiment [Figure 3] Cross-sectional view showing the state where the plug according to the first embodiment is fitted to the pipe [Figure 4] Cross-sectional view of the reinforcing bar joint unit according to the first embodiment before grout filling. [Figure 5] Diagram illustrating the operation of the rod-shaped member during grout filling in the first embodiment. [Figure 6] Diagram illustrating the operation of the rod-shaped member during grout filling in the second embodiment. [Figure 7] Diagram illustrating the grout filling process in the third embodiment. [Figure 8] Side view of the stopper according to the fourth embodiment [Figure 9] Side view of the stopper according to the fifth embodiment [Modes for carrying out the invention]

[0027] Embodiments of the present invention will be described in detail below with reference to the drawings.

[0028] <First Embodiment> Figure 1 is a cross-sectional view of a column member 2 to which the stopper 1 of the present invention is applied, showing the state before the start of grout filling. As shown in Figure 1, the column member 2 includes a lower column member 3 and an upper column member 4 made of precast concrete. The lower column member 3 and the upper column member 4 are arranged with a predetermined joint 5 between them. Formwork 6 is assembled around the outer circumference of the column member 2 to close the joint 5.

[0029] Multiple lower column main reinforcement bars 7, extending vertically, are embedded in the upper end of the lower column member 3, with their upper ends protruding. Multiple upper column main reinforcement bars 8, extending vertically, are embedded in the upper column member 4. Although the lower column main reinforcement bars 7 and upper column main reinforcement bars 8 are shown as round steel bars, they are actually deformed steel bars. Sleeve joints 10, embedded in the lower surface 9 of the upper column member 4 with their lower ends exposed, are attached to the lower ends of the upper column main reinforcement bars 8.

[0030] The sleeve joint 10 is a mechanical reinforcement joint that has a cylindrical shape extending in the vertical direction and mechanically connects the upper column main reinforcement 8 and the lower column main reinforcement 7. The lower end of the sleeve joint 10 forms an opening 11 on the lower surface 9 of the upper column member 4, and the upper end of the corresponding lower column main reinforcement 7 is inserted into this opening 11 at the lower end of the sleeve joint 10. The upper end of the sleeve joint 10 is provided with an opening 12 that is sized to allow the lower end of the upper column main reinforcement 8 to pass through. The lower end of the upper column main reinforcement 8 inserted through this opening 12 is located in the middle of the sleeve joint 10 in the vertical direction, and when the upper column member 4 is placed in a predetermined position on the lower column member 3, it faces the upper end of the lower column main reinforcement 7 with a small gap 13 between them. A cylindrical portion 14 that protrudes radially outward is provided on the outer circumferential surface near the upper end of the sleeve joint 10. The cylindrical portion 14 defines a grout discharge port 15.

[0031] A pipe 16 connected to the grout outlet 15 of the sleeve joint 10 is further embedded in the upper column member 4. The pipe 16 is made of a resin such as polyvinyl chloride. One end 16a of the pipe 16 is inserted into the inside of the cylindrical portion 14 and fixed to the cylindrical portion 14. The other end 16b of the pipe 16 is exposed on the side surface 17 of the upper column member 4. This pipe 16 becomes an air discharge passage for the sleeve joint 10 when grout material is filled into the sleeve joint 10. Typically, when the discharge of grout material from the pipe 16 is confirmed, the grout filling of the sleeve joint 10 is considered to be complete. In this embodiment, before the start of the grout filling work, stoppers 1 are fitted to the other end 16b of all pipes 16 from the outside of the upper column member 4. The air venting structure and fitting structure of the stoppers 1 will be described in detail later.

[0032] When joining the lower column member 3 and the upper column member 4, grout material is injected into the joint 5 between the lower column member 3 and the upper column member 4 from a grout injection port (not shown) provided in the formwork 6. The injected grout material passes through the joint 5 and fills the sleeve joint 10 through the opening 11 at the lower end of each sleeve joint 10. As the grout material rises inside the sleeve joint 10, the air inside the sleeve joint 10 is discharged to the outside through the grout outlet 15 and the pipe 16. The grout material is discharged from the grout outlet 15 while pushing out the air and fills the pipe 16 from one end 16a to the other end 16b. In this way, the grout material filled in the joint 5, the sleeve joint 10 and the pipe 16 hardens, joining the lower column member 3 and the upper column member 4. In other words, the sleeve joint 10 is a grout-filled reinforcement bar joint. Furthermore, these sleeve joints 10, pipes 16, and stoppers 1 constitute a sleeve joint unit 18, or rebar joint unit.

[0033] As shown in Figure 2, the stopper 1 has a main body 20 having a frustoconical shape with an axis 20X, and an engaging portion 21 provided at the rear of the main body 20 for engaging a tool. The insertion direction relative to the pipe 16 in the direction of the axis 20X of the main body 20 is defined as the front. A male screw 22 is provided on the outer circumferential surface of the main body 20. A groove 24 extending in the direction of the axis 20X is also formed on the outer circumferential surface of the main body 20. The stopper 1 is preferably made of resin, and the hardness of the material of the stopper 1 is the same as or harder than the material of the pipe 16 shown in Figure 1. Specifically, the Rockwell hardness of the material of the stopper 1, when measured on the M scale (HRM) or R scale (HRR), is the same as or harder than the material of the pipe 16 shown in Figure 1 (e.g., polyvinyl chloride). The material of the stopper 1 may be, for example, polypropylene or methacrylic resin.

[0034] In this embodiment, the male screw 22 is a single-start tapered male screw that tapers in diameter towards the insertion direction (forward) of the stopper 1. The male screw 22 is also a triangular screw. The male screw 22 and the main body 20 as a whole have a frustoconical shape.

[0035] The engaging portion 21 has an arbitrary shape that can be engaged with a tool (e.g., a wrench) for rotating the stopper 1. In the present embodiment, the engaging portion 21 is a protrusion formed in a substantially rectangular parallelepiped shape and protruding from the rear end 20a of the main body portion 20. That is, the outer surface of the rear end portion of the stopper 1 has a non-circular shape that facilitates torque transmission. In other embodiments, the engaging portion 21 may be formed to be recessed in the rear end 20a of the main body portion 20.

[0036] The groove 24 extends from the rear end 20a to the front end 20b of the main body portion 20 and is formed with a constant depth. The depth of the groove 24 is substantially the same as the height of the thread of the male thread 22 in the illustrated example. That is, the bottom of the groove 24 is aligned with the valley (bottom of the valley) of the male thread 22. In other examples, the depth of the groove 24 may be smaller or larger than the height of the thread of the male thread 22. Alternatively, the groove 24 may be formed such that the depth changes along the axial direction 20X of the main body portion 20.

[0037] In the illustrated example, the groove 24 is formed at one location on the outer peripheral surface of the main body portion 20. In other embodiments, a plurality of grooves 24 may be formed at a plurality of locations spaced apart in the circumferential direction on the outer peripheral surface of the main body portion 20. As shown in FIG. 1, a rod-shaped member 25 is disposed in the groove 24. The rod-shaped member 25 will be described later. Also, in the illustrated example, the groove 24 has an arc-shaped cross-sectional shape. In other examples, the groove 24 may have a V-shaped cross-sectional shape. <{0000156} FIG. 3 is a cross-sectional view showing a state in which the stopper 1 according to the present embodiment is fitted to the pipe 16. As shown in FIG. 3, the thread diameter D1 of the male thread 22 at the front end 20b of the main body portion 20 of the stopper 1 is smaller than the inner diameter D2 of the pipe 16 (D1 < D2). Also, the thread diameter D3 of the male thread 22 at the rear end 20a of the main body portion 20 of the stopper 1 is larger than the inner diameter D2 of the pipe 16 (D3 > D2).

[0039] The following describes the grout filling process using the stopper 1 with reference to Figures 1 to 3. Prior to filling with grout, the stopper 1 is fitted to the other end 16b of the pipe 16 for all sleeve joints 10. When fitting the stopper 1 to the pipe 16, the worker inserts the stopper 1 into the pipe 16 with the main body 20 facing forward (towards the upper column member 4) while the rod-shaped member 25 is positioned in the groove 24. As described above, since the thread diameter D1 of the male thread 22 at the front end 20b of the main body 20 of the stopper 1 is smaller than the inner diameter D2 of the pipe 16, the worker can easily insert the main body 20 of the stopper 1 into the pipe 16.

[0040] Next, the worker grips the engaging portion 21 or engages a tool with the engaging portion 21 of the stopper 1 and rotates the stopper 1 clockwise. As a result, the male thread 22 formed on the outer circumference of the main body portion 20 bites into the inner surface of the pipe 16, and the stopper 1 enters the pipe 16 and is fitted into the pipe 16. At this time, the worker should rotate the stopper 1 until the torque required to rotate the stopper 1 reaches a predetermined value, or until the stopper 1 reaches a predetermined rotation angle from the position where it stops after being pushed into the pipe 16. In this way, because the stopper 1 has an engaging portion 21 provided at the rear end 20a of the main body portion 20, when fitting the stopper 1, the stopper 1 can be rotated using a tool such as a wrench engaged with the engaging portion 21, or by gripping the engaging portion 21 in a manner that facilitates torque transmission.

[0041] As shown in Figure 4, the rod-shaped member 25 is thinner than the cross-section of the groove 24 and longer than the length (axial length) of the main body 20 of the stopper 1. The rod-shaped member 25 is a member for confirming that the grout material has filled the inside of the pipe 16, and is slidably provided within the groove 24. Therefore, it is preferable that the rod-shaped member 25 and the groove 24 be positioned on the upper part of the stopper 1 when the stopper 1 is fitted onto the pipe 16. The rod-shaped member 25 may be made of, for example, bamboo, wood, resin, etc. It is preferable that the rod-shaped member 25 is a different color from the stopper 1 and has high saturation or brightness so that it can be easily confirmed by visual inspection.

[0042] The front end (front in the illustrated example) of the rod-shaped member 25 is provided with a large-diameter portion 26 having a larger diameter than the rod-shaped member 25. The dimensions of the large-diameter portion 26 should be approximately the same as the cross-section of the groove 24. The large-diameter portion 26 may be formed from the same material as the rod-shaped member 25, or from a different material. The rod-shaped member 25 may be formed from a material that absorbs water and expands, such as cotton or paper. After the stopper 1 is fitted onto the pipe 16, the rod-shaped member 25 is positioned forward (towards the pipe 16). That is, the rod-shaped member 25 is positioned such that its rear end is inside the groove 24 and its front end is inside the pipe 16. The large-diameter portion 26 only needs to be provided on the part of the rod-shaped member 25 that is located inside the pipe 16.

[0043] With stoppers 1 attached to the pipes 16 of all sleeve fittings 10, the worker injects grout material through a grout inlet (not shown). The injected grout material fills the inside of the sleeve fittings 10 and the pipes 16. The grout material fills the pipes 16 while pushing out air. The pushed-out air is discharged to the outside of the pipe 16 through the spiral space 23 and groove 24 between the inner surface of the pipe 16 and the valley 22b of the male thread 22 of the stopper 1. As a result, the grout material is filled into the pipes 16 without any air remaining inside.

[0044] Figure 5 is an explanatory diagram of the operation of the rod-shaped member 25 during grout filling. As shown in Figure 5(A), the grout material moves inside the pipe 16 toward the other end 16b while pushing out air. When the grout material comes into contact with the large-diameter portion 26 of the rod-shaped member 25, the large-diameter portion 26 moves toward the other end 16b together with the grout material because the grout material is viscous. As the rod-shaped member 25 slides inside the groove 24, the front part of the groove 24 is blocked by the large-diameter portion 26, as shown in Figure 5(B). Therefore, the grout material does not leak from the groove 24. The worker can confirm that the filling material has been filled into the pipe 16 by the rod-shaped member 25 moving backward from its initial position.

[0045] To ensure that the grout material is completely filled, the worker increases the grout pressure. In the stopper 1 according to this embodiment, when the stopper 1 is fitted onto the other end 16b of the pipe 16, the threads 22a of the male thread 22 of the main body 20 bite into the inside of the pipe 16. Therefore, when the grout pressure is increased, the stopper 1 is less likely to come off the pipe 16. Furthermore, the hardness of the material of the stopper 1 is the same as or harder than the material of the pipe 16. Therefore, the threads (peaks 22a) of the male thread 22 of the stopper 1 bite into the inside of the pipe 16, making it more difficult for the stopper 1 to come off the pipe 16. Furthermore, in the stopper 1 according to this embodiment, the male thread 22 is a tapered thread. Therefore, the height of the threads is constant from the front end 20b to the rear end 20a of the male thread 22. That is, the threads are pointed at any position in the direction of the axis 20X. Therefore, even if there are variations in the dimensions of the stopper 1 and pipe 16 due to tolerances, deformation, or deposits, the pointed threads can be bitten into the inner surface of pipe 16, ensuring that the stopper 1 is securely fitted onto pipe 16.

[0046] Furthermore, in the stopper 1 according to this embodiment, an engaging portion 21 is provided at the rear end 20a of the main body portion 20 of the stopper 1. As a result, when inserting or removing the stopper 1, even if it is not possible to grip the engaging portion 21 by hand and rotate the stopper 1, the stopper 1 can be easily rotated by using a tool such as a wrench on the engaging portion 21. Therefore, inserting and removing the stopper 1 is easy. In addition, since the engaging portion 21 is a projection with a non-circular outer surface that protrudes from the rear end 20a of the main body portion 20, when inserting or removing the stopper 1, the worker can grip the engaging portion 21 in a manner that facilitates torque transmission and rotate the stopper 1. Therefore, it is also possible to insert and remove the stopper 1 without using a tool.

[0047] After the grout has hardened, the worker removes the stopper 1 from the pipe 16 and pushes a finishing material such as mortar into the recess in the pipe 16 where the stopper 1 was removed to flatten the outer surface of the upper column member 4. The stopper 1 according to this embodiment is made of resin. Therefore, even if the hardened grout adheres to the male thread 22 or groove 24 of the stopper 1, the grout can be easily removed from the stopper 1. Thus, the stopper 1 can be easily reused. Note that the removal and finishing work of the stopper 1 is not mandatory. For example, the stopper 1 may be left in place. Alternatively, the stopper 1 may be cut along the outer surface of the upper column member 4, and only the portion protruding from the outer surface may be removed.

[0048] <Second Embodiment> Next, a second embodiment of the present invention will be described with reference to Figure 6. Components identical to those in the first embodiment are denoted by the same reference numerals, and redundant descriptions are omitted. The same applies to subsequent embodiments unless otherwise specified.

[0049] Figure 6 is an explanatory diagram of the operation of the rod-shaped member 25 during grout filling in the second embodiment. This embodiment differs from the first embodiment in that a large-diameter portion 26 is not provided at the front of the rod-shaped member 25, but the other configurations are the same. As shown in Figure 6(A), when the grout material moves inside the pipe 16 toward the other end 16b and comes into contact with the front of the rod-shaped member 25, the rod-shaped member 25 moves together with the grout material and slides inside the groove 24. Air inside the pipe 16 is discharged from the groove 24 and the valleys of the male thread 22 until the grout material fills the pipe 16.

[0050] As shown in Figure 5(B), the rod-shaped member 25 is thinner than the cross-section of the groove 24, so the front of the groove 24 is not blocked. On the other hand, the rod-shaped member 25 has a cross-sectional area that prevents leakage of the grout material, which is filled with a predetermined filling pressure, from the groove 24. Therefore, after the grout material is filled into the pipe 16, leakage of the grout material from the groove 24 is prevented by the rod-shaped member 25. The worker can confirm that the filling material has been filled into the pipe 16 by the rod-shaped member 25 moving backward from its initial position.

[0051] <Third Embodiment> Figure 7 is an explanatory diagram of the grout filling operation in the third embodiment. As shown in Figure 7(A), in this embodiment, the rod-shaped member 25 is not placed in the groove 24 when the grout material is injected. As shown in Figure 7(B), when the grout material moves inside the pipe 16 and reaches the stopper 1, it leaks out from the other end 16b of the pipe 16 through the groove 24. The worker can then confirm that the grout material has been filled. Subsequently, as shown in Figure 7(C), the worker can stop the leakage of the grout material by inserting the rod-shaped member 25 into the groove 24.

[0052] Furthermore, when injecting the grout material as shown in Figure 7(A), the worker may confirm the presence (reached position) of the grout material by touch by inserting the rod-shaped member 25 into the groove 24. Since the groove 24 is provided on the outer circumferential surface of the main body 20 of the stopper 1 along the axis 20X direction, the worker can confirm whether or not the pipe 16 has been filled with grout material by placing the rod-shaped member 25 in the groove 24 and protruding the rod-shaped member 25 into the inside of the pipe 16.

[0053] <Fourth Embodiment> Figure 8 is a side view of the stopper 101 according to the fourth embodiment. In this embodiment, the configuration of the stopper 101 differs from that of the first embodiment. Specifically, the stopper 101 according to the fourth embodiment differs from the stopper 1 according to the first embodiment in that the male screw 122 is a double-threaded screw. Other parts are the same as in the first embodiment. In the following, the shape of the male screw 122 will be described in detail, and other parts will be denoted by the same reference numerals as in the first embodiment and their descriptions will be omitted. The same applies to subsequent embodiments.

[0054] As shown in Figure 8, the male thread 122 of the stopper 101 according to the fourth embodiment is a double-start tapered thread. With this configuration, the stopper 101 can be fitted onto the pipe 16 with fewer rotations compared to when the male thread 122 is a single-start thread. Therefore, the time required to fit the stopper 101 can be shortened. In addition, when the stopper 101 is fitted onto the pipe 16, the thread grooves (valleys 22b) communicate with the inside of the pipe 16 at two locations in the circumferential direction, so that air does not remain inside the pipe 16 when grout is injected can be prevented more reliably.

[0055] <Fifth Embodiment> Figure 9 is a side view of the stopper 201 according to the fifth embodiment. The stopper 201 according to the fifth embodiment differs from the stopper 1 according to the first embodiment in that the male screw 222 is a parallel screw. Other parts are the same as in the first embodiment.

[0056] As shown in Figure 9, the male thread 222 of the stopper 201 according to the fifth embodiment is a single-start parallel thread. The main body 20 is formed to have a frustoconical shape by grinding the parallel thread so that the diameter decreases in the direction of insertion of the stopper 201. The groove 24 is formed to a certain depth. Therefore, at the front of the main body 20, the bottom of the groove 24 is deeper than the valley of the male thread 222.

[0057] This configuration makes threading the male screw 222 easier compared to when the male screw 222 is a single-start tapered thread. Therefore, the manufacturing cost of the stopper 201 can be reduced.

[0058] This concludes the description of specific embodiments, but the present invention is not limited to the above embodiments and can be broadly modified and implemented. For example, in the above embodiment, the sleeve joint 10 connected two lower column main reinforcements 7 and upper column main reinforcements 8 that extended vertically, but the sleeve joint 10 may connect two beam main reinforcements that extended horizontally. Also, in the above embodiment, the joint was a sleeve joint 10 for connecting reinforcement bars, but it may also be a grout-filled reinforcement joint for connecting other reinforcement bars such as reinforcement bars made of aramid or reinforcement bars made of carbon. That is, the sleeve joint unit 18 in the above embodiment constitutes a reinforcement joint unit. Also, in the above embodiment, the lower column main reinforcement bars 7 and upper column main reinforcement bars 8 were embedded in the lower column member 3 and upper column member 4, respectively, but they may be connected by the sleeve joint 10 in an exposed state. Furthermore, each configuration of the above embodiment may be combined with one another. In addition, the specific configuration, arrangement, quantity, material, manufacturing method, etc. of each member or part can be changed as appropriate without departing from the spirit of the present invention. On the other hand, not all of the components shown in the above embodiment are necessarily essential, and can be selected as appropriate. [Explanation of symbols]

[0059] 1. Stopping (First to Third Embodiments) 10 Sleeve joints (reinforcement bar joints) 15 Grout outlet 16 pipes 18 Sleeve joint unit (reinforcement bar joint unit) 20 Main body 20a rear end 20b front end 21 Engaging part 22 Male screw (1st to 3rd embodiments) 24 groove 25 Rod-shaped member 26 Large diameter section 101 Stopper (Fourth Embodiment) 122 Male screw (4th embodiment) 201 Stopper (Fifth Embodiment) 222 Male screw (5th embodiment)

Claims

1. A grout-filled reinforcing bar joint having a grout outlet, A pipe connected to the grout outlet, A reinforcing bar joint unit comprising a stopper fitted to the aforementioned pipe, The aforementioned stopper, The main body has a truncated cone shape, A male screw provided on the outer surface of the main body, The main body portion has grooves provided along the axial direction on its outer circumferential surface, A reinforcing bar joint unit characterized in that no female threads are formed on the inner surface of the pipe, a space is formed between the valley of the male thread and the inner surface of the pipe, and the space and the groove form a passage for discharging air from inside the pipe.

2. The reinforcing bar joint unit according to claim 1, characterized in that the depth of the groove is the same as the height of the threads of the male screw.

3. The reinforcing bar joint unit according to claim 1 or 2, characterized in that the male thread is a tapered thread.

4. The reinforcing bar joint unit according to claim 1 or 2, characterized in that the main body is formed from resin.

5. The reinforcing bar joint unit according to any one of claims 1 to 4, further comprising a rod-shaped member arranged in the groove so as to protrude from the main body into the inside of the pipe.

6. The reinforcing bar joint unit according to claim 5, characterized in that a large-diameter portion having a larger diameter than the rod-shaped member is provided in the portion of the rod-shaped member located inside the pipe.

7. The reinforcing bar joint unit according to claim 5, characterized in that the rod-shaped member has a cross-sectional area that prevents leakage of grout material, which is filled into the reinforcing bar joint with a predetermined filling pressure, from the groove.

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