Joint member

Abstract

To enable works in an aspect that joint members are placed covering reinforcement bars from the upper side, while making the joint members hardly detachable from the reinforcement bars.SOLUTION: A joint member 1 comprises first and second integration recess 11, 12, and a connection part 13. The first and second integration recesses comprise: space parts 111, 121 into which the end part of reinforcement bars 81, 81 and a nut 83 with a washer 83a screwed to a male-screw part at the tip of each reinforcement bar 81 fit; and opposed wall parts 112, 122, which have opposed surfaces 112a, 122a having the washer 83a facing to them and cutout parts 112b, 122b into which the end part of the reinforcement bar 81 is introduced. The connection part connects the opposed wall part 112 and the opposed wall part 122. The aforesaid opposed surfaces 112a, 122a comprise contacting parts 113, 123 which prevent the joint member 1 from moving out of the reinforcement bar 81 with the effect of the peripheral surface of the washer 83a contacting them in the state the washer 83a comes close to the opposed wall parts 112, 122 with the nut 83 being screwed in.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a joining member that can be used to join precast concrete members. [Background technology]

[0002] Patent Document 1 discloses a structure in which a precast concrete foundation forming the rising part of the foundation is provided with a recess for filling with grout material formed at the place where the foundations are joined, and an anchor bar having a rod-shaped body connected to a main bar, the tip side of the rod-shaped body being exposed in the recess and the tip side being formed with a convex part protruding from the rod-shaped body. Patent Document 1 further discloses a joining member for joining the anchor bars, having a notch part into which the end part of the anchor bar of each precast concrete foundation is introduced and a fitting part that fits into the convex part.

[0003] Patent Documents 2 and 3 also disclose joining members capable of joining reinforcing bars in a precast concrete foundation. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2017-66598 A [Patent Document 2] Japanese Utility Model Application Publication No. 5-94429 [Patent Document 3] JP 2016-56514 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, although the joint member disclosed in Patent Document 1 has the advantage that the joint member can be attached by covering the upper side of the reinforcing bar by having the notch, there is a risk that the joint member may come off the reinforcing bar or the convex portion when an upward force is applied to the joint member before grout is filled. Moreover, it is not easy to detect such a coming off, especially in the case of a joint member disposed on the lower side of a precast concrete member. Patent Documents 2 and 3 cannot solve such a problem.

[0006] In view of the above circumstances, an object of the present invention is to enable work in which a joining member is placed over a reinforcing bar from above, while making it difficult for the joining member to come off the reinforcing bar. [Means for solving the problem]

[0007] In order to solve the above problems, the joint member of the present invention is a joint member for joining protruding reinforcing bars of precast concrete members arranged with their end faces facing each other, A first fitting recess having a space portion into which an end of one of the reinforcing bars and a nut screwed onto the tip male screw portion of the reinforcing bar are fitted, and an opposing wall portion having an opposing surface that faces the pressing surface side of the nut and a notch portion into which the end of the reinforcing bar is introduced; A second fitting recess having a space into which the end of the other reinforcing bar and a nut screwed onto the tip male screw portion of the reinforcing bar are fitted, and an opposing wall portion having an opposing surface that faces the pressing surface side of the nut and a notch portion into which the end of the reinforcing bar is introduced; a connecting portion that connects the opposing wall portion of the first fitting recess and the opposing wall portion of the second fitting recess; It has The opposing surface of the opposing wall portion has a contact portion that prevents movement of the joining member in the direction of removal from the reinforcing bar by contacting the peripheral surface of the pressing surface side of the nut when the pressing surface side of the nut is close to the opposing wall portion due to the nut being screwed in.

[0008] The connecting member having the above-mentioned configuration has a notch portion into which the end of the reinforcing bar is introduced, so that the connecting member can be fitted in such a manner that it covers the end of the reinforcing bar from above. When the washer approaches the opposing wall portion by screwing the nut, the peripheral surface of the washer abuts against the abutment portion, preventing the connecting member from moving in a direction away from the reinforcing bar. Therefore, even if a force is applied to the connecting member, the connecting member can be prevented from coming off the reinforcing bar.

[0009] The pressing surface of the nut may be made of a washer.

[0010] An opening may be formed on the side opposite to the side where the inlet of the cutout is located, whereby the nut can be turned through the opening and it is also easy to check whether the washer is positioned opposite the abutment portion.

[0011] The abutment portion may be a rising portion of a countersink formed in the opposing surface of the opposing wall portion, or may be a protrusion protruding from the opposing surface of the opposing wall portion. Effect of the Invention

[0012] The present invention has the advantage that the connecting member can be fitted onto the end of the reinforcing bar from above, and even if force is applied to the connecting member after fitting and before filling with grout, the connecting member can be prevented from coming off the reinforcing bar. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a schematic explanatory diagram showing the joints between protruding rebars of a precast concrete foundation arranged with their end faces facing each other. [Diagram 2] 1A to 1C are schematic bottom, left side, right side and perspective views showing a joining member according to an embodiment. [Diagram 3]1 is an explanatory diagram showing a state in which a joining member of an embodiment is placed over a nut screwing point of a reinforcing bar at a joint of a precast concrete foundation. FIG. [Figure 4] FIG. 13 shows the state in which a nut screwed onto the male threaded portion at the end of a reinforcing bar is turned so that the peripheral surface of the washer of the nut faces the contact portion of the connecting member, where (A) is a plan view and (B) is an explanatory diagram showing the connecting member in horizontal cross section. [Diagram 5] This is an explanatory diagram showing the procedure of covering the nut screwing point of the reinforcing bar with a joining member and turning the nut screwed into the male threaded portion at the end of the reinforcing bar so that the peripheral surface of the washer of the nut faces the contact portion of the joining member. [Figure 6] FIG. 11 shows a state in which a nut screwed onto the male threaded portion at the end of a reinforcing bar is turned to bring the peripheral surface of the washer of the nut into contact with the abutment portion of the connecting member, using another embodiment of the connecting member. FIG. 11(A) is a plan view, and FIG. 11(B) is an explanatory diagram showing the connecting member in horizontal cross section. [Figure 7] FIG. 11 is an explanatory diagram showing the procedure for covering the nut screwing portion of the reinforcing bar with the joining member of the other embodiment described above, and turning the nut screwed into the male thread portion at the tip of the reinforcing bar to bring the peripheral surface of the washer of the nut into contact with the contact portion of the joining member. [Figure 8] 1A and 1B are a perspective view and a side view showing the external appearance (with abutment portions omitted) of a joint member in an embodiment in which opposing walls are rectangular. [Figure 9] 1A and 1B are a perspective view and a side view showing the external appearance (with abutment portions omitted) of a joining member of an embodiment in which opposing wall portions are circular. [Figure 10] 13A and 13B are a perspective view and a side view showing the external appearance (without abutment portions) of a joining member of another embodiment in which the opposing wall portions are circular. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. 1 shows a state in which one reinforcing bar 81 and another reinforcing bar 81 are positioned with their tips butted against each other. Each reinforcing bar 81 protrudes into a grout-filled recess 82 formed on the upper surface side of the end face of the precast concrete foundation 80. The precast concrete foundation 80 is suspended, for example, by a crane and placed on a footing portion (not shown).

[0015] Each reinforcing bar 81 is, for example, an anchor bar lap-spliced ​​to the upper end bar of each precast concrete foundation 80, and has a male thread portion 81a at its tip. A hexagonal nut 83 is screwed into each male thread portion 81a. The pressing surface side of the nut 83 is made of a circular washer 83a, and this washer 83a faces the base side of the male thread portion 81a.

[0016] 2 shows a joint member 1 that joins reinforcing bars 81 of a precast concrete foundation 80. This joint member 1 has a first fitting recess 11, a second fitting recess 12, and a connecting portion 13.

[0017] The first fitting recess 11 has a space 111 that houses the end of one reinforcing bar 81 and a nut 83 screwed onto the male thread 81a of the reinforcing bar 81, and an opposing wall 112 having an opposing surface 112a that faces the washer 83a and a notch 112b into which the end of the reinforcing bar 81 is introduced. The opposing wall 112 is made of a rectangular steel plate, and a semicircular hole at the end of the notch 112b is located approximately in the center of the rectangular plate. This semicircular hole is the portion into which the one reinforcing bar 81 fits.

[0018] The second fitting recess 12 has a space 121 into which the end of the other reinforcing bar 81 and a nut 83 screwed onto the male thread 81a of the reinforcing bar 81 fit, and an opposing wall 122 having an opposing surface 122a facing the washer 83a and a notch 122b into which the end of the reinforcing bar 81 is inserted. The opposing wall 122 is made of a rectangular steel plate, and a semicircular hole at the end of the notch 122b is located in the approximate center of the rectangular plate. This semicircular hole is the portion into which the other reinforcing bar 81 fits.

[0019] The connecting portion 13 is a member that connects the opposing wall portion 112 of the first fitting recess 11 and the opposing wall portion 122 of the second fitting recess 12. The connecting portion 13 is made of, for example, two rectangular steel plate members 131, 131 that connect the edge sides of the opposing surfaces 112a and 122a to each other. As a result, an opening for introducing the end of the nut 83 or the reinforcing bar 81 is formed on the entrance side of the cutout portion 112b. Furthermore, in this embodiment, an opening 13a is also formed on the surface opposite to the surface on which the opening is formed.

[0020] The facing surface 112a of the first fitting recess 11 has an abutment portion 113 consisting of a circular circumferential surface larger than the circular outer periphery of the washer 83a. When the washer 83a is brought close to the facing wall portion 112 by screwing the nut 83, the abutment portion 113 prevents the joining member 1 from moving in the direction of separation from the reinforcing bar 81 by the outer circumferential surface of the washer 83a abutting against the abutment portion 113. The abutment portion 113 consists of a rising portion of a circular countersunk hole larger than the washer 83a, which is formed in the facing surface 112a. The center of this countersunk hole coincides with the center of the semicircular hole portion of the cutout portion 112b.

[0021] Similarly, the facing surface 122a of the second fitting recess 12 has an abutment portion 123 consisting of a circular circumferential surface larger than the circular outer periphery of the washer 83a. When the washer 83a is brought close to the facing wall portion 122 by screwing the nut 83, the abutment portion 123 prevents the joining member 1 from moving in the direction of separation from the reinforcing bar 81 by the outer circumferential surface of the washer 83a abutting against the abutment portion 123. The abutment portion 123 consists of a rising portion of a circular countersunk hole larger than the washer 83a, formed in the facing surface 122a. The center of the countersunk hole coincides with the center of the semicircular hole portion of the cutout portion 122b.

[0022] Next, the procedure for attaching the joint member 1 will be described with reference to Figures 3, 4(A), 4(B) and 5. The worker places the joint member 1 over the ends of the reinforcing bars 81, 81 from above with the notched portions 112b, 122b facing downward, positions the end of the reinforcing bar 81 and the nut 83 screwed onto the male screw portion 81a on the tip side of the reinforcing bar 81 in each of the first fitting recess 11 and the second fitting recess 12, and introduces the end of the reinforcing bar 81 into the notched portions 112b, 122b.

[0023] Next, the nut 83 is turned with a finger inserted through the opening 13a in the connecting portion 13, and the nut 83 is brought closer to the opposing wall portions 112, 122. As the nut 83 is screwed in, the washer 83a approaches the opposing wall portions 112, 122, respectively, and enters the circular countersunk holes that are larger than the washer 83a. As the washer 83a enters the countersunk holes, the abutment portions 113, 123, which are the rising portions of the countersunk holes, face the peripheral surface of the washer 83a.

[0024] In this way, the connecting member 1 has the notches 112b, 122b into which the ends of the reinforcing bars 81, 81 are introduced, so that the connecting member 1 can be fitted in such a manner that it covers the ends of the reinforcing bars 81, 81 from above. Then, when the washer 83a is brought close to the opposing wall parts 112, 122 by screwing the nut 83, the peripheral surface of the washer 83a comes into contact with the contact parts 113, 123, preventing the connecting member 1 from moving in the direction away from the reinforcing bars 81, 81. Therefore, even if some force is applied to the connecting member 1, it is possible to prevent the connecting member 1 from coming off the reinforcing bars 81, 81.

[0025] In addition, since the opening 13a is formed on the side opposite to the side where the inlets of the cutouts 112b and 122b are present, the nut 83 can be turned through the opening 13a, and it is also easy to check whether the washer 83a is positioned opposite the abutment parts 113 and 123. However, it is not essential that the opening 13a is formed, and even if a closed structure is used in which a plate member is placed at the opening 13a, the nut 83 can be turned through the opening on the side where the inlets of the cutouts 112b and 122b are present. After turning the nut 83, it is possible to check whether the nut 83 is in a state of being prevented from coming off by applying a small amount of force to the joint member 1 to remove it. It is preferable that the plate member placed at the opening 13a has a hole formed therein for venting air when filling the grout.

[0026] Next, a modified example of the joining member 1 will be described with reference to Fig. 6 and Fig. 7. The joining member 1 according to this modified example has abutting portions 114, 124 consisting of annular convex portions protruding from the opposing surfaces 112a, 122a of the opposing walls 112, 122. When the nut 83 is screwed in, the washer 83a approaches the opposing walls 112, 122, respectively, and enters the inside of the annular convex portions. By entering the inside of the annular convex portions, the abutting portions 114, 124 consisting of the convex portions face the circumferential surface of the washer 83a. That is, when the washer 83a is brought close to the opposing wall portions 112, 122 by screwing the nut 83, the peripheral surface of the washer 83a comes into contact with the abutting portions 114, 124, thereby preventing the connecting member 1 from moving in the direction away from the reinforcing bars 81, 81, and therefore, even if a force is applied to the connecting member 1, the connecting member 1 can be prevented from coming off the reinforcing bars 81, 81. Note that the abutting portions 114, 124 are not limited to convex portions connected in an annular shape, and may be convex portions located scattered in an annular shape, or may be convex portions present only in the vicinity of the inlet sides of the cutout portions 112b, 122b.

[0027] In the above example, the connecting member 1 was applied to the upper part of the precast concrete foundation 80, but this is not limited to the above, and the connecting member 1 can also be applied to a part on the lower side of the precast concrete foundation 80 where one reinforcing bar and the other reinforcing bar are positioned with their tips butted against each other.

[0028] In the above example, the nut 83 has a circular washer 83a on the pressing surface side of the nut, but the washer 83a may be omitted.

[0029] In the above example, the opposing walls 112, 122 are made of rectangular plate material as shown in FIG. 8, but the present invention is not limited to this.

[0030] 9, the opposing walls 112 and 122 may be made of a circular plate material. The connecting portion 13 may be made of two rectangular plates connecting the side surfaces of the opposing walls 112 and 122, with an opening for introducing the nut 83 formed on the side that serves as the entrance of the cutout portion 112b, and an opening 13a that allows the nut 83 and the washer 83a to be visually confirmed on the side opposite to the surface on which the opening is formed.

[0031] Alternatively, as shown in FIG. 10, connecting portion 13 may be made of two rectangular steel plates connecting the somewhat lower sides of the side portions of opposing wall portions 112 and 122 made of circular plates, and one rectangular steel plate connecting the upper sides, with an opening for the introduction of nuts 83, etc. formed on the side that serves as the entrance to cutout portion 112b, and openings 13a forming the openings to enable the nuts 83 and washers 83a to be viewed, etc., are formed in two places diagonally above the surface on which the openings are formed.

[0032] Although the embodiment of the present invention has been described above with reference to the drawings, the present invention is not limited to the illustrated embodiment. Various modifications and variations can be made to the illustrated embodiment within the same scope as the present invention or within an equivalent scope. [Explanation of symbols]

[0033] 1: Joint material 11: First fitting recess 12: Second fitting recess 13: Joint 13a: Opening 80: Precast concrete foundation 81: Reinforced concrete 81a: Male screw part 82: Grout-filled recess 83: Nut 83a: Washer (pressure surface side) 111: Spatial part 112: opposing wall 112a: Opposite surface 112b: Notch 113: Hitting part 114: Hitting part 121: Spatial part 122: Opposing wall 122a: Opposite surface 122b: Notch 123: Hitting part 124: Hitting part 131: Rectangular plate material

Claims

1. A joint member for joining protruding rebars of precast concrete members arranged with their end faces facing each other, a first fitting recess having a space into which an end of one of the reinforcing bars and a nut screwed onto the male threaded end of the reinforcing bar are fitted, and an opposing wall having an opposing surface that faces the pressing surface side of the nut and a notch into which the end of the reinforcing bar is introduced; a second fitting recess having a space into which the end of the other reinforcing bar and a nut screwed onto the male threaded end of the reinforcing bar are fitted, and an opposing wall having an opposing surface that faces the pressing surface side of the nut and a notch into which the end of the reinforcing bar is introduced; a connecting portion connecting the opposing wall portion of the first fitting recess and the opposing wall portion of the second fitting recess; It has A joining member characterized in that the opposing surface of the opposing wall portion has a contact portion that prevents the joining member from moving in a direction away from the reinforcing bar when the pressing surface side of the nut comes into contact with the peripheral surface of the pressing surface side of the nut when the nut is screwed in and the pressing surface side of the nut is close to the opposing wall portion.

2. 2. The joining member according to claim 1, wherein the pressing surface of the nut is made of a washer.

3. 2. The joining member according to claim 1, further comprising an opening formed on a side opposite to the side on which the inlet of the notch is located.

4. 4. The joining member according to claim 1, wherein the abutment portion is formed from a rising portion of a countersink formed in the opposing surface of the opposing wall portion.

5. 4. The joining member according to claim 1, wherein the contact portion is a protrusion protruding from the opposing surface of the opposing wall portion.

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