Reinforcing bar connection hole closing structure of concrete member and lock nut

Abstract

To prevent leakage of a grout material from a reinforcement connection hole of a concrete member.SOLUTION: A reinforcement connection hole closing structure A includes a concrete member 10, a screw reinforcement 20, a seal member 30, and a lock nut 40. A reinforcement connection hole 11 filled with a grout material is formed in the concrete member 10. The screw reinforcement 20 is inserted into the reinforcement connection hole 11 and projected from the opening 12. The seal member 30 surrounds the screw reinforcement 20 and abuts on an opening edge 13 of the reinforcement connection hole 11. The lock nut 40 is screwed to the screw reinforcement 20 and abuts on the seal member 30. The seal member 30 is composed of an elastic material, and the lock nut 40 is composed of a pair of half bodies 4142, divided in the radial direction.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a closing structure for a reinforcing bar connection hole formed in a concrete member, through which a reinforcing bar is inserted and which is filled with grout, and to a lock nut used to close this reinforcing bar connection hole. [Background technology]

[0002] To integrate two concrete members, one construction method involves inserting the rebar protruding from the first concrete member into a rebar connection hole formed in the second concrete member, and then filling the joints between the concrete members and the rebar connection hole with grout to integrate the two members. When filling with grout, the rebar connection hole is closed.

[0003] A conventional reinforcing bar connection hole blocking structure described in Patent Document 1 below, as shown in Figure 10(A), comprises a concrete member 1 having a reinforcing bar connection hole 1a formed therein, a threaded reinforcing bar 2 inserted into the reinforcing bar connection hole 1a and protruding from its opening 1b, a closing plate 3 through which the threaded reinforcing bar 2 can be inserted, and a lock nut 4 screwed onto the threaded reinforcing bar 2. As shown in Figures 10(B) and (C), the closing plate 3 has a seal plate 3b made of synthetic resin or metal with a fitting hole 3a formed in the center, and a seal portion 3c provided around the periphery of the back surface of the seal plate 3b.

[0004] The lock nut 4 is made of synthetic resin and has a conical portion 4a at one axial end, as shown in Figure 10(D). The lock nut 4 has an opening / closing portion S cut axially along a portion of its circumference. A protrusion 4b is provided on one of the cut end faces defining the opening / closing portion S, and a fitting recess 4c into which the protrusion 4b is fitted is formed on the other. A thin hinge connection portion 4d is formed at a location radially opposite the opening / closing portion S, and the lock nut 4 can be opened and closed using the hinge connection portion 4d as an axis.

[0005] To close a reinforcing bar connection hole 1a with the closing structure described in Patent Document 1, first, the threaded reinforcing bar 2 protruding from the reinforcing bar connection hole 1a is passed through the fitting hole 3a of the closing plate 3, and the closing plate 3 is placed on the edge of the opening 1b of the reinforcing bar connection hole 1a. Next, the lock nut 4 is brought close to the threaded reinforcing bar 2 from its opening / closing part S, and the lock nut 4 surrounds the threaded reinforcing bar 2. After that, the opening / closing part S is closed, the protrusion 4b is fitted into the fitting recess 4c, and the lock nut 4 is screwed onto the threaded reinforcing bar 2.

[0006] Next, when the lock nut 4 is screwed in, the conical portion 4a of the lock nut 4 is fitted into the fitting hole 3a of the closing plate 3, and the sealing portion 3c of the closing plate 3 is pressed against the edge of the opening 1b of the rebar connection hole 1a, closing the rebar connection hole 1a. After that, grout material is filled into the rebar connection hole 1a through the grout injection hole 5. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 8-290419 Summary of the Invention [Problem to be solved by the invention]

[0008] In the closure structure of Patent Document 1, the lock nut 4 is openable and closable, so that it can be attached to the threaded reinforcing bar 2 from the radial direction. However, to prevent the lock nut 4 from falling off the threaded reinforcing bar 2, the lock nut 4 maintains a closed state by fitting a protrusion 4b on the cut end face of the lock nut 4 into a fitting recess 4c, and by fitting a conical portion 4a of the lock nut 4 into a fitting hole 3a of the closure plate 3. This makes the structure complicated.

[0009] Furthermore, after the grout material has hardened, when another concrete component is to be integrated with the threaded reinforcing bar 2 protruding from the concrete component 1, the lock nut 4 and closing plate 3 must be removed, but due to their complex structure, this removal is time-consuming. [Means for solving the problem]

[0010] The present invention has been made to solve at least one of the above problems, and a reinforcing bar connection hole closing structure for a concrete member according to one aspect of the present invention comprises: a concrete member having reinforcing bar connection holes formed therein and filled with grout material; A screw reinforcing bar inserted into the reinforcing bar connection hole and protruding from the opening; a sealing member that surrounds the threaded reinforcing bar and abuts against an opening edge of the reinforcing bar connection hole; a lock nut that is screwed onto the threaded reinforcing bar and abuts against the sealing member, The sealing member is made of an elastic material, and the lock nut is made of a pair of halves split in the radial direction.

[0011] According to the above configuration, the lock nut, consisting of a pair of radially separated halves, can be easily attached and detached from the threaded reinforcing bar from its radial direction. When the lock nut attached to the threaded reinforcing bar is screwed into the sealing member, the sealing member is pressed against the edge of the reinforcing bar connection hole in the concrete member, and the inner diameter of the sealing member is reduced, so that it fits tightly against the outer periphery of the threaded reinforcing bar. This allows the sealing member to close the gap between the edge of the reinforcing bar connection hole and the threaded reinforcing bar, preventing leakage of grout material. The lock nut receives a repulsive force from the sealing member it presses against. As a result, the female thread of the lock nut presses the male thread of the threaded reinforcing bar in the axial direction, increasing the frictional force that resists radial movement of the half body. This allows the pair of half bodies to maintain the sealing member pressed against them without separating.

[0012] Preferably, the end face of the lock nut on the sealing member side has an outer diameter larger than the inner diameter of the opening of the reinforcing bar connection hole. According to the above configuration, the lock nut has a portion that faces the opening edge of the rebar connection hole and presses against the sealing member, thereby exerting a strong repulsive force from the sealing member on the lock nut, making it more difficult to separate the pair of half bodies.

[0013] Preferably, one of the pair of half bodies has a recessed groove formed on a surface facing the other half body, and the other half has a ridge that fits into the recessed groove on a surface facing the one half body. This configuration avoids the inconvenience of combining halves with the same female thread configuration. Furthermore, if the grooves and ridges are formed to extend in the axial direction of the lock nut, radial displacement of the halves can be prevented, and if they are formed to extend in the radial direction, axial displacement of the halves can be prevented.

[0014] Preferably, the sealing member is a flat annular body having a C-shape with a cut portion formed at one location in the circumferential direction, and has an inner diameter smaller than the maximum outer diameter of the threaded reinforcing bar. According to the above configuration, the C-shaped sealing member can be easily attached and detached from the threaded reinforcing bar from its radial direction via the cutout. Because the inner diameter of the sealing member is smaller than the maximum outer diameter of the threaded reinforcing bar, the sealing member can be reduced in diameter by pressing the lock nut, enhancing the effect of tightly adhering to the outer periphery of the threaded reinforcing bar.

[0015] Preferably, the sealing member has a cable tie attached to an outer peripheral surface thereof and is fastened in the radial direction. With this configuration, the sealing member tightened to the cable tie can be more tightly attached to the outer periphery of the threaded rebar and the edge of the rebar connection hole by reducing its inner diameter and expanding axially. Furthermore, tightening the sealing member strengthens the repulsive force of the sealing member against the lock nut, making it more difficult for the pair of halves to separate. This improves the effectiveness of preventing grout leakage.

[0016] A lock nut according to another aspect of the present invention is a lock nut in which a threaded reinforcing bar is inserted into a reinforcing bar connection hole formed in a concrete member and filled with grout material, the threaded reinforcing bar protrudes from the opening of the reinforcing bar connection hole, and is surrounded by a sealing member made of an elastic material that can abut against the opening edge of the reinforcing bar connection hole, and the lock nut is screwed onto the threaded reinforcing bar and abuts against the sealing member, It is characterized by being made up of a pair of halves separated in the radial direction. [Effects of the Invention]

[0017] According to the present invention, leakage of grout material from reinforcing bar connection holes can be prevented. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a perspective view showing a reinforcing bar connection hole closing structure for a concrete member according to one embodiment of the present invention; [Figure 2] FIG. [Figure 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2. [Figure 4] 1A is a front view showing the installation of a lock nut used in the sealing structure to a threaded reinforcing bar, and FIG. 1B is a front view showing the removal of the lock nut from the threaded reinforcing bar. [Figure 5] 1A is an enlarged perspective view showing the lock nut, and FIG. 1B is an enlarged perspective view showing a sealing member used in the closing structure. [Figure 6] 3A and 3B are enlarged perspective views showing half bodies that constitute the lock nut, in which FIG. 3A shows one half body and FIG. 3B shows the other half body. [Figure 7] 10A and 10B are enlarged perspective views showing modified examples of the half bodies that make up the lock nut, where FIG. 10A shows a modified example of one half body, and FIG. 10B shows a modified example of the other half body. [Figure 8] FIG. 10 is a perspective view showing a comparative example of a reinforcing bar connection hole closing structure for a concrete member. [Figure 9]1A is an enlarged perspective view showing a U-shaped member used in a closing structure of a comparative example, and FIG. 1B is an enlarged plan view showing the same U-shaped member. [Figure 10] 8(B) is a rear view of a closing plate used in the conventional blocking structure; FIG. 8(C) is a cross-sectional view along line BB in FIG. 8(B); and FIG. 8(D) is an oblique view of a lock nut used in the conventional blocking structure. DETAILED DESCRIPTION OF THE INVENTION

[0019] A structure for closing a reinforcing bar connection hole in a concrete member (hereinafter simply referred to as a closing structure) according to one embodiment of the present invention will be described below with reference to FIGS. 1 to 6. FIG. The closing structure A shown in FIGS. 1 to 3 includes a concrete member 10, a threaded reinforcing bar 20, a sealing member 30, and a lock nut 40.

[0020] As shown in Fig. 3, a rebar connection hole 11 is formed inside the concrete member 10, which in this embodiment extends laterally and penetrates the concrete member 10. An opening 12 for the rebar connection hole 11 is formed on the side of the concrete member 10. The area surrounding the opening 12 forms an opening edge 13. A grout material injection hole (not shown) that communicates with the rebar connection hole 11 is formed in the concrete member 10, and the grout material is filled through this injection hole.

[0021] The screw reinforcing bar 20 is a reinforcing bar with a male thread portion 21 formed on its outer periphery, and two radially opposing locations on the outer periphery of the screw reinforcing bar 20 are flat surfaces 22 that do not have the male thread portion 21. In this embodiment, the screw reinforcing bar 20 is a main beam reinforcement that protrudes from a concrete beam member (not shown), and is inserted through the reinforcing bar connection hole 11 of the concrete member 10 and protrudes from the opening 12.

[0022] The sealing member 30 is made of an elastic material, surrounds the screw reinforcing bar 20, and abuts against the opening edge 13 of the reinforcing bar connection hole 11, blocking the gap between the screw reinforcing bar 20 and the opening edge 13 to prevent grout material from leaking from the reinforcing bar connection hole 11.

[0023] In this embodiment, the sealing member 30 is made of foamed polyethylene, and as shown in Fig. 5(B), it is a flat hollow cylinder (ring) with a circular hole formed inside, and has a cut portion 31 cut in the axial direction at one point in the circumferential direction, forming a C-shape. Therefore, the sealing member 30 can be easily attached to and detached from the threaded reinforcing bar 20 from its radial direction via the cut portion 31.

[0024] The inner diameter of the sealing member 30 is formed to be smaller than the maximum outer diameter of the threaded reinforcing bar 20 . 1 to 3, a cable tie 50 may be attached to the outer circumferential surface of the sealing member 30. By tightening the cable tie 50, the sealing member 30 can be more tightly attached to the outer periphery of the threaded reinforcing bar 20 and the opening edge 13 of the reinforcing bar connection hole 11 by reducing the inner diameter and expanding in the axial direction.

[0025] The lock nut 40 is threaded onto the threaded reinforcing bar 20 and abuts against the axial end face of the sealing member 30, pressing the sealing member 30 against the opening edge 13 of the reinforcing bar connection hole 11. This pressing prevents the sealing member 30 from shifting due to the pressure when the grout material is filled into the reinforcing bar connection hole 11, and also reduces the inner diameter of the sealing member 30, causing it to adhere tightly to the outer periphery of the threaded reinforcing bar 20, thereby improving the effectiveness of preventing leakage of the grout material.

[0026] 5(A) and 6, the lock nut 40 is made of a pair of halves separated radially, comprising a first halve 41 and a second halve 42. In this embodiment, the lock nut 40 is made of synthetic resin, and the halves 41 and 42 are separated by a plane including the axis of the lock nut 40.

[0027] A female thread portion 43 is formed on the inner periphery of the lock nut 40, and is adapted to thread onto the male thread portion 21 of the threaded reinforcing bar 20 when the half bodies 41 and 42 are combined. Therefore, the female thread portion 43 is formed differently between the half bodies 41 and 42.

[0028] In this embodiment, a flange 44 is provided on the end of the lock nut 40 on the sealing member 30 side. As shown in Fig. 3, the end face of the flange 44 on the side that abuts against the sealing member 30 has an outer diameter that is larger than the inner diameter of the opening 12 of the reinforcing bar connection hole 11.

[0029] In addition, in this embodiment, as shown in Figure 6(A), a recessed groove 45 is formed on the surface 41a of the half-body 41 facing the half-body 42, and as shown in Figure 6(B), a protruding rib 46 is formed on the surface 42a of the half-body 42 facing the half-body 41.

[0030] The groove 45 of the half body 41 includes a radial groove 45d extending radially inward from the outer peripheral surface of the flange portion 44, and an axial groove 45a extending axially from the inner end of the radial groove portion 45d to the end face opposite the sealing member 30 side.

[0031] The ridges 46 of the half-split body 42 include radial ridges 46d extending radially inward from the outer peripheral surface of the flange portion 44, and axial ridges 46a extending axially from the inner end of the radial ridges 46d to reach the end face opposite the seal member 30. The radial ridges 46d and the axial ridges 46a are adapted to fit into the radial grooves 45d and the axial grooves 45a, respectively.

[0032] The grooves 45 and the ridges 46 can prevent the half bodies 41 and 42 from being misaligned in the axial direction, while the radial grooves 45d and the radial ridges 46d can prevent the half bodies 41 and 42 from being misaligned in the radial direction.

[0033] Next, the installation and removal of the lock nut 40 will be described. As shown in Figure 4(A), the lock nut 40 is attached to the threaded reinforcing bar 20 to which the sealing member 30, which is fastened with a cable tie 50, is attached. At this time, the opposing surfaces 41a, 42a of the half bodies 41, 42 are positioned around the male thread portion 21 of the threaded reinforcing bar 20, and the half bodies 41, 42 are joined together. This allows the lock nut 40 to be threaded onto the threaded reinforcing bar 20 and can be screwed in. Because the lock nut 40 is made up of the half bodies 41, 42, it can be easily attached to the threaded reinforcing bar 20 from its radial direction.

[0034] 3, lock nut 40 is screwed in and pressed against seal member 30, which is fastened with cable ties 50, so that the entire end face of flange 44 of lock nut 40 is tightly attached to seal member 30. At this time, radial ridge 46d of half body 42 of lock nut 40 is fitted into radial groove 45d of half body 41, so that the pressing force of lock nut 40 is transmitted evenly to seal member 30. The sealing member 30 is pressed firmly against the opening edge 13 of the reinforcing bar connection hole 11 in the concrete member 10 , and the inner diameter thereof is further reduced to come into close contact with the outer periphery of the threaded reinforcing bar 20 .

[0035] The lock nut 40 receives a repulsive force from the pressed seal member 30, so the female thread portion 43 of the lock nut 40 presses the male thread portion 21 of the threaded reinforcing bar 20 axially, away from the concrete member 10. This increases the frictional force acting against the radial movement of the half bodies 41, 42. This allows the half bodies 41, 42 to maintain the pressure of the seal member 30 without separating.

[0036] The lock nut 40 has a flange 44 with an outer diameter larger than the inner diameter of the opening 12 of the rebar connection hole 11, and thus has a portion facing the opening edge 13, pressing the sealing member 30. This allows a strong repulsive force to act on the lock nut 40 from the sealing member 30, enhancing the effect of making it difficult for the half bodies 41, 42 to separate.

[0037] Furthermore, the axial expansion of the sealing member 30 due to tightening of the binding band 50 contributes to an increase in the repulsive force of the sealing member 30 against the lock nut 40, making it more difficult for the half bodies 41, 42 to separate.

[0038] After the lock nut 40 is attached, grout is injected into the reinforcing bar connection hole 11 through a grout injection hole (not shown). In this embodiment, since another concrete member is integrated with the threaded reinforcing bar 2 protruding from the concrete member 10, it is necessary to remove the lock nut 40 and the sealing member 30 after the grout material has hardened.

[0039] 4(B), to remove the lock nut 40, the lock nut 40 is loosened and the opposing surfaces 41a, 42a of the half bodies 41, 42 are positioned around the flat surface 22 of the threaded reinforcing bar 20. Next, the half bodies 41, 42 are moved away from each other parallel to the flat surface 22, thereby removing the lock nut 40 from the threaded reinforcing bar 20. In other words, the lock nut 40 can be easily removed from the threaded reinforcing bar 20 in its radial direction.

[0040] The cable tie 50 can be removed from the sealing member 30 by loosening the fastening to the sealing member 30 or by cutting it. The sealing member 30 can be removed radially from the threaded reinforcing bar 20 via the cutting portion 31.

[0041] According to the above embodiment, it is possible to provide a reinforcing bar connection hole blocking structure that has a simple structure, is easy to attach and detach, and has an improved effect of preventing leakage of grout material. Furthermore, for example, even if shear reinforcement is arranged in the screw reinforcement 20 protruding from the concrete member 10 and there is only a small gap between the shear reinforcement and the concrete member 10, the sealing member 30 and lock nut 40 can be attached and removed from the radial direction of the screw reinforcement 20, making it possible to construct and dismantle the blocking structure A.

[0042] [Variations] Next, we will explain modified examples of the half bodies 41 and 42 that make up the lock nut 40. Note that for the following modified examples, only the configurations that differ from the above-described half bodies 41 and 42 will be explained, and similar components will be given the same reference numerals and their explanation will be omitted.

[0043] 7(A) and (B) show half bodies 41V and 42V, which are modifications of half bodies 41 and 42, respectively. As shown in Fig. 7(A), in half body 41V, no recessed grooves are formed on the surface 41a facing half body 42V, and the surface is flat. As shown in Fig. 7(B), in half body 42V, no protrusions are formed on the surface 42a facing half body 41V, and the surface is flat.

[0044] When the closing structure A for the reinforcing bar connection hole 11 is configured, the lock nut 40 receives a repulsive force from the sealing member 30 with the female thread portion 43 screwed onto the male thread portion 21 of the threaded reinforcing bar 20. Therefore, even without the recessed groove and ridge, the axial displacement of the half bodies 41V, 42V is prevented. Furthermore, the repulsive force causes the female thread portion 43 to press the male thread portion 21 in the axial direction, thereby increasing the frictional force against the radial movement of the half bodies 41V, 42V, and therefore the radial displacement of the half bodies 41V, 42V is prevented even without the recessed groove and ridge.

[0045] Since there are no grooves or ridges on the opposing surfaces 41a, 42a, there is a possibility that half-pieces having different formation patterns of the female screw portion 43 may be combined together, but this inconvenience can be avoided, for example, by making the colors of the half-pieces 41V, 42V different.

[0046] [Comparative Example] Next, as a comparative example, a closing structure B for a reinforcing bar connection hole 11 in a concrete member 10 using a U-shaped member 60 instead of a lock nut 40 will be described with reference to Figures 8 and 9. In the following comparative example, only the configurations that differ from the above-described embodiment of the present invention will be described, and similar components will be given the same reference numerals and their description will be omitted.

[0047] As shown in Figures 9(A) and (B), the U-shaped member 60 has a U-shape formed by forming a cutout portion 61, which is a portion of the annular shape cut away in the circumferential direction. The cutout portion 61 is defined by opposing surfaces 61a, 61a, which are a pair of parallel cut surfaces. The U-shaped member 60 is made of resin and has elasticity. A female thread portion 62 that screws onto the male thread portion 21 of the threaded reinforcing bar 20 is formed on the inner periphery of the U-shaped member 60. The thickness (axial length) of the U-shaped member 60 is formed to be greater than the axial width of the thread that forms the thread of the threaded reinforcing bar 20.

[0048] 8, in order to attach the U-shaped member 60 to the screw reinforcing bar 20, first, the U-shaped member 60 is brought closer to the screw reinforcing bar 20 from the radial direction so that the opposing surface 61a of the notched portion 61 is parallel to the flat surface 22 of the screw reinforcing bar 20. When the notched portion 61 overcomes the flat surface 22, the U-shaped member 60 is attached to the screw reinforcing bar 20 by expanding or contracting its diameter due to elastic deformation.

[0049] The U-shaped member 60 is screwed onto the threaded reinforcing bar 20, allowing it to be screwed in. Next, the U-shaped member 60 is screwed in and pressed against the sealing member 30 fastened with the cable tie 50. This creates a closing structure B for the reinforcing bar connection hole 11 using the U-shaped member 60.

[0050] In this closing structure B, the U-shaped member 60 attached to the threaded reinforcing bar 20 needs to have elasticity to allow the diameter to expand and contract, and because there is a missing portion in the circumferential direction due to the missing portion 61, the U-shaped member 60 cannot press the sealing member 30 strongly. As a result, the sealing member 30 cannot be pressed strongly against the opening edge portion 13 of the reinforcing bar connection hole 11. As a result, the grout material in the reinforcing bar connection hole 11 may leak from the gap between the sealing member 30 and the opening edge portion 13, and the closing structure B is not effective enough in preventing leakage of the grout material.

[0051] Furthermore, with closure structure B, the U-shaped member 60 cannot be expected to apply a strong pressure, so whether or not the grout leaks depends heavily on how well the sealing member 30 is fastened by the cable ties 50. If this fastening is insufficient, the grout will leak from the cut portion 31 of the sealing member 30. Because the quality of the fastening by the cable ties 50 depends on the skill of the worker, with closure structure B there is room for improvement in the stability of the grout leakage prevention effect.

[0052] In contrast to the comparative example of the closing structure B, in the closing structure A according to the above-described embodiment of the present invention, the lock nut 40 can strongly press the sealing member 30, and thus the sealing member 30 can be strongly pressed against the opening edge 13 of the reinforcing bar connection hole 11. Furthermore, even if the tightening of the sealing member 30 by the cable tie 50 is insufficient, the strong pressing of the lock nut 40 against the sealing member 30 can compensate for the insufficient tightening of the cable tie 50. Furthermore, because the pressing of the lock nut 40 against the sealing member 30 is not dependent on the skill of the individual, the stability of the grout leakage prevention effect is ensured.

[0053] The present invention is not limited to the above-described embodiment, and can be modified as appropriate within the scope of the invention. In the above embodiment, a circular hole surrounding the threaded reinforcing bar 20 is formed in the sealing member 30, but the shape of this hole may be shaped to match the cross-sectional shape of the threaded reinforcing bar. The lock nut 40 may be made of metal or other materials. The grooves 45 may be either the radial grooves 45d or the axial grooves 45a, and the ridges 46 may be either the radial ridges 46d or the axial ridges 46a. [Industrial Applicability]

[0054] The present invention can be applied to a closing structure for a reinforcing bar connection hole formed in a concrete member, through which a reinforcing bar is inserted and which is filled with grout, and to a lock nut used to close this reinforcing bar connection hole. [Explanation of symbols]

[0055] A, B Reinforcement bar connection hole closing structure, 10 concrete member, 11 reinforcement bar connection hole, 12 reinforcement bar connection hole opening, 13 opening edge, 20 threaded reinforcing bar, 21 male thread portion, 22 flat surface, 30 sealing member, 31 cutting portion, 40 lock nut, 41 first half body, 41V first half body, 41a opposing surface, 42 second half body, 42V second half body, 42a opposing surface, 43 female thread portion, 44 flange portion, 45 groove, 45d radial groove, 45a axial groove, 46 ridge, 46d radial groove, 46a axial groove, 50 cable tie, 60 U-shaped member, 61 missing portion, 61a opposing surface, 62 female thread portion

Claims

1. a concrete member having reinforcing bar connection holes formed therein and filled with grout material; A screw reinforcing bar inserted into the reinforcing bar connection hole and protruding from the opening; a sealing member that surrounds the threaded reinforcing bar and abuts against an opening edge of the reinforcing bar connection hole; a lock nut that is screwed onto the threaded reinforcing bar and abuts against the sealing member, A structure for closing a reinforcing bar connection hole in a concrete member, characterized in that the sealing member is made of an elastic material, and the lock nut consists of a pair of halves divided in the radial direction.

2. 2. The reinforcing bar connection hole closing structure for a concrete member according to claim 1, wherein the end face of the lock nut on the sealing member side has an outer diameter larger than the inner diameter of the opening of the reinforcing bar connection hole.

3. A reinforcing bar connection hole closing structure for a concrete member as described in claim 1 or 2, characterized in that a groove is formed on the surface of one of the pair of half-bodies facing the other half-bodies, and a protrusion that fits into the groove is provided on the surface of the other half facing the one half-bodies.

4. The sealing member is C-shaped with a cut portion formed at one point around the circumference of a flat ring body, and its inner diameter is smaller than the maximum outer diameter of the screw reinforcing bar.

5. 5. The reinforcing bar connection hole closing structure for a concrete member according to claim 4, wherein the sealing member has a cable tie attached to its outer peripheral surface and is fastened in the radial direction.

6. A lock nut is provided in which a threaded reinforcing bar inserted into a reinforcing bar connection hole formed in a concrete member and filled with grout protrudes from the opening of the reinforcing bar connection hole and is surrounded by a sealing member made of an elastic material that can abut against the opening edge of the reinforcing bar connection hole, and the lock nut is screwed onto the threaded reinforcing bar and abuts against the sealing member, A lock nut characterized by comprising a pair of halves split in the radial direction.

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