JP2007077590A - Reinforcement connecting method and reinforcement joint member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide reinforcement joint members dispensing with high-cost machining such as thread cutting and easily mountable to the mutually abutting part of diameter enlarged parts, and to provide a reinforcement connecting method. <P>SOLUTION: The reinforcement joint members 20, 30 for butt-connecting the diameter enlarged parts 12 of reinforcements 10 with the diameter enlarged parts are composed of semicylindrical parts 21, 31 with the shape of one of vertically bisected cylindrical parts surrounding the diameter enlarged parts 12 and reinforcement parts 11 connected thereto, and outward flanges 25, 35 projected to the outer peripheral side from the vicinity of two linear sides 24, 34 and formed with bolt insertion holes 26, 36. Two outward flanges 25, 35 are provided, and an angle θ defined by their projecting directions is set to 90°. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a technique for connecting reinforcing bars, and more specifically, a method for connecting reinforcing bars in which an enlarged diameter portion is provided at an end portion of the reinforcing bars, and the enlarged diameter portions are constrained and connected to each other. The present invention relates to a joint member to be used.

  As a reinforcing bar with a fixing part to fix the reinforcing bar to concrete and other reinforcing bars, a diameter-enlarged part is formed at the end of the reinforcing bar, and the reinforcing bar with the enlarged end part is used as the fixing part. It is developed and provided by people (see Patent Document 1) and contributes to the construction of reinforced concrete. This expanded diameter part is formed by expanding the end of the reinforcing bar base material by hot upsetting using induction heating. Has been. A typical shape of the above-mentioned enlarged-diameter portion that functions as a fixing portion is a disc shape whose outer diameter is 2 to 5 times the rebar diameter and whose thickness is 0.5 to 2 times the rebar diameter. By changing, other shapes can be easily formed.

  In the case of connecting and lengthening such a reinforcing bar with an enlarged diameter portion, conventionally, the end portion without the enlarged diameter portion is abutted and connected by pressure welding or welding. In addition, a connection method in which the end of the reinforcing bar is processed into a plate shape and stacked and then screwed, a connection method using a threaded sleeve, a connection method in which a sleeve joint is filled with a filler, and the like are used. The connection between the reinforcing bars not provided with the fixing enlarged-diameter portion is similarly performed.

JP 2000-257209 A (first page)

However, such conventional connection methods include (1) strength after processing of the end of the reinforcing bar, (2) processing cost of the end of the reinforcing bar, (3) manufacturing cost of the joint member, and (4) equipment required for connection work. , (5) At least one difficulty related to any of the concerns such as connection work required time.
An object of the present invention is to provide a reinforcing bar connecting technique that generally satisfies the above-mentioned problems.

  In the method for connecting reinforcing bars of the present invention (Claim 1), an enlarged diameter portion is provided at each connected end of the two reinforcing bars to be connected, and each of the enlarged diameter portions is connected to the two reinforcing bars. After linking the end faces to each other in a form that forms a pair of enlarged diameter portions, the cylindrical body with inward collars at both ends is vertically divided. A pair of joint members having a split configuration and a pair of semi-cylindrical parts with inwardly facing collars at both ends that are tailored to a size and shape that can be externally fitted to the pair of enlarged diameter parts. The two reinforcing bars are connected by being bound and restrained by a combined body.

  Further, the reinforcing bar connecting method according to the present invention (Claim 2) is the reinforcing bar connecting method according to Claim 1, wherein the outer diameter of the enlarged diameter portion is set to an expansion ratio of 1 with respect to the reinforcing bar base material. In the range of 2 to 1.5, the bulge height from the reinforcing bar base material is limited to 8 mm or less.

  Furthermore, the method for connecting reinforcing bars according to the present invention (Claim 3) is the method for connecting reinforcing bars according to Claims 1 and 2, and is further directed inwardly at the both ends of the semi-cylindrical portion constituting the joint member. The internal spacing between the colors is set to a dimension obtained by adding a margin to a dimension obtained by doubling the dimension in the axial direction of the enlarged diameter portion, and one or more spacers are inserted in the play caused by the margin. The length after connection of the two connected reinforcing bars is adjusted by adjusting the knitting of the insertion position and the insertion thickness in the joint member axial direction of the spacer. It is characterized by adjusting.

  Moreover, the joint member for reinforcing bars according to the present invention (Claim 4) is the joint member used in the method for connecting reinforcing bars according to any one of Claims 1 to 3, and the cylinder in each body of the pair of semi-cylindrical parts. Each of the two sides of each linear body corresponding to the vertical division of the body is provided with a flange-like outward flange that serves as a foothold for mutually connecting the bodies of the semi-cylindrical parts. It is characterized by.

  Further, the reinforcing bar joint member according to the present invention (Claim 5) is the reinforcing bar joint member according to Claim 4, wherein the outward flange is formed at two locations by the mutual coupling. It is characterized in that the orientation knitting of each outward flange is set so that the depression angle of the coupling portion is 90 ° or less.

  Moreover, the joint member for reinforcing bars according to the present invention (Claim 6) is the joint member used in the method for connecting reinforcing bars according to any one of Claims 1 to 3, and the cylinder in each body of the pair of semi-cylindrical parts. A flange-like outward flange is provided on one of the two straight sides of the body corresponding to the vertical division of the rod-like body and serves as a foothold for mutually connecting the bodies of the semi-cylindrical parts. And the remaining one of the two sides of each body in the straight line is provided with a girder structure that can connect the semi-cylindrical parts to each other in the circumferential direction. Features.

  Further, a reinforcing bar joint member according to the present invention (Claim 7) is the reinforcing bar joint member according to Claim 6 above, and the handle structure provided on the remaining one side is the direction of the handle. However, one end of the one side is inward with the outer peripheral surface side of the semi-cylindrical portion as the root, and the other end is outward with the inner peripheral surface side of the semi-cylindrical portion as the base. The structure is such that the mutual coupling body can be constituted by two bodies of one specification.

  A reinforcing bar joint member according to the present invention (Claim 8) is a reinforcing bar joint member according to any one of Claims 4 to 7, and further, the outward flange is provided with a bolt insertion hole. Features.

  Moreover, the joint member for reinforcing bars of the present invention (Claim 9) is the joint member for reinforcing bars according to Claims 4 to 7, and the outward flange has a cross-sectional shape orthogonal to the protruding direction. A ring-shaped member can be externally fitted to the meeting part of the pair of flanges formed when the bodies of the semi-cylindrical parts of the pair face each other for the mutual coupling, and the meeting parts can be bound. It has a shape.

  According to the method for connecting reinforcing bars of the present invention (Claim 1), (A) preliminary processing for providing an enlarged diameter portion at an end of a reinforcing bar provided for connection, and (B) the enlarged diameter portions are connected to each other. Preparation of joint members of paired knitting (segment coalescence type) that can be externally restrained by connecting a pair of expanded diameter parts in a continuous state, and (C) an operation of connecting reinforcing bars to form an enlarged diameter part pair at the reinforcing bar connection site And the joint member mounting operation in which the two segments of the joint member are externally fitted to the pair of enlarged diameter portions and are combined into a cylindrical body and then fixed in a mutually coupled state, thereby completing the connection of the reinforcing bars. .

Here, the preliminary processing for expanding the diameter of the reinforcing bar end portion in (A) can be performed by hot upsetting similar to the above-described fixing diameter expanding portion at the reinforcing bar end portion. The use of the processing line for is suitable. In addition, as will be described later, the enlarged diameter portion for the method of the present invention has a larger expansion ratio than the enlarged diameter portion for fixing, so that the processing cost is lower than that for the enlarged diameter portion for fixing.
Next, in the joint member (B), the shape of the trunk portion (semi-cylindrical portion) that constitutes the joint member is simple, and additional structures such as an outward flange and a hand for joining the segments to each other are added. However, mass production by multiple simultaneous casting is easy, and procurement does not require a large cost.

In addition, the joint member mounting work in (C) can be performed by performing a total of 2 or 4 operations per joint for fastening the bolts and nuts between the outward flanges, the ring external fitting and binding, or the joints between the claws. As long as you have a general-purpose tool such as a wrench, it is enough. In other words, it is unrelated to dedicated tools and large-scale dedicated facilities that are troublesome to obtain, and the work required time is as short as about 10 minutes.
That is, according to the connection method of the present invention (Claim 1), (2) to (5) among the various problems in the conventional connection method are solved at once. In addition, in the connection method of the present invention (Claim 1), since the diameter-enlarged portion is provided at the end of the rebar to be connected, the above problem (1) regarding the strength of the end of the rebar is also solved.

  Next, according to the method for connecting reinforcing bars of the present invention (Claim 2), the joint to be attached to the expanded diameter part by restricting the outer diameter of the expanded diameter part to the upper limit in the connection method (Claim 1). Measures to ensure the required thickness of the thin wall part that governs the axial strength of the member, and the single-wall bulge height from the connected reinforcing bar of the reinforcing bar connecting part to which the joint member is attached are attached to the connected reinforcing bar. Derivatives related to the connection in such a manner that the increase in the required cover thickness of the concrete due to the attachment of the joint member is suppressed to a level equal to or less than the common reinforcing bar diameter (13 mm or 16 mm) of the stirruped stirrup (band). A treatment that avoids an increase in cost is possible in a compatible manner. This point will be described later (see the sixth embodiment). In addition, the lower limit restriction | limiting of the diameter expansion magnification in this connection method (Claim 2) is for ensuring the enlarged diameter part pair restraint function (locking function) by a joint member according to a reinforcing bar diameter. Incidentally, the diameter-enlarged portion having a diameter-enlarging magnification of 1.2 to 1.5 that falls within the above-mentioned regulation range can be easily formed by performing hot upsetting on the end of the reinforcing bar.

  Furthermore, according to the method for connecting reinforcing bars of the present invention (Claim 3), in the connection method (Claim 1, Claim 2), inwardly provided at both ends of the semi-cylindrical portion constituting the joint member. A margin is provided for the inner dimension of the collar, that is, the dimension in the axial direction of the portion where the enlarged diameter portion pair is accommodated, and the play due to the margin is erased by inserting the spacer in the adjusted position / thickness knitting. This makes it possible to adjust the post-connection length of the connected reinforcing bars to compensate for the length variation of the connected reinforcing bars (see the fifth embodiment).

  Moreover, in the joint member for reinforcing bars of the present invention (Claim 4), when two reinforcing bars are to be connected in series, the end surfaces of the enlarged diameter portions of the end portions of both reinforcing bars are arranged to face each other. Then, a pair of expanded diameter portions is formed, and a pair-knitted reinforcing bar joint member is attached thereto. At that time, in the cylindrical body configuration in which those semi-cylindrical parts face each other, the outer diameter-enclosed surroundings are surrounded by the above-mentioned enlarged diameter part, and then the bolts are passed through the bolt insertion holes so that the facing outward flanges are connected to each other. The outward flanges that are fastened or fixed facing each other are externally fitted with a ring-shaped member and bound and fixed. If it does so, it will be surrounded by the assembled cylindrical body, and since the enlarged diameter part of both reinforcing bars will not leave | separate, two reinforcing bars are connected mutually.

In this way, it is possible to connect the reinforcing bars by covering the enlarged diameter part of the reinforcing bar end with a pair of reinforcing steel joint members and bolting the outward flanges together. There is no need to perform equipment or skilled work, and it is not necessary to perform the troublesome work of fastening the reinforcing bars directly after processing the ends of the reinforcing bars into a plate shape. There is no need for expensive members such as sleeves, and there is no need to perform complicated operations such as filling the sleeve joints. Low-cost members such as easy-to-manufacture shapes and bolts that are commercially available, wrench, and pliers , Reinforcing bars can be easily connected using a general-purpose tool such as a hammer.
Therefore, according to this invention, it is possible to realize a joint member for reinforcing bars that is inexpensive and has good construction efficiency.

Further, in the joint member for reinforcing bars of the present invention (Claim 5), the depression angle of the outward flange joint portion formed at two locations by the mutual coupling is 90 ° or less, so Even in quadrilateral arrangements frequently used for reinforcing bar structures, it is possible to easily avoid outward flanges coming out of the quadrilateral arrangement by placing the outward flange inward or on the side. . Therefore, even if there are two outward flanges, it is not necessary to increase the amount of concrete cover on the outer peripheral side of the reinforcing bar structure, and the bar arrangement may be the same as before.
Therefore, according to the present invention, it is possible to realize a joint member for reinforcing bars that is inexpensive, has high construction efficiency, and is easy to arrange.

Furthermore, in the joint member for reinforcing bars according to the present invention (Claim 6), one of the two coupled sides in each body of the semi-cylindrical part is coupled in a flange form, and the other is coupled in a hand form. As a result, there is only one outward flange, so the labor for fastening bolts during installation is halved, and when the outward flange of a reinforcing bar joint member is incorporated into a reinforcing bar structure, the flange It is possible to easily and surely make the wire face the inside of the reinforcing bar structure.
Therefore, according to the present invention, it is possible to realize a joint member for reinforcing bars that is inexpensive, has high construction efficiency, and is easy to arrange.

Further, in the joint member for reinforcing steel bars of the present invention (Claim 7), the claws are provided in each half-cylindrical part in a combination of an inward-winning hand and an outward-winning hand. Due to the structure, when another joint member for reinforcing bars having the same shape is reversed and faced, the claws are engaged and engaged with each other. For this reason, the pair-knitted members facing each other can be made of the same shape, so that the number of parts is reduced, and not only mounting work but also inventory management and the like are facilitated.
Therefore, according to the present invention, it is possible to realize a joint member for reinforcing bars that is inexpensive, has a high construction efficiency, and is easy to arrange with a small number of parts.

  The configuration of an embodiment (first embodiment) of a joint member for reinforcing bars according to the present invention will be described with reference to the drawings. 1A is a perspective view of one joint member 20 of which the pair is knitted, FIG. 1B is a perspective view of the other joint member 30, and FIG. 1C is a view of the joint members 20 and 30 facing each other. However, (d) is an end view of the connected state in which the joint members 20 and 30 are externally fitted to the enlarged diameter pair 12 and 12 of the two connected reinforcing bars 10 to form an interconnected body. It is a side view of the connection state.

  Reinforcing bar joint member 20 (see FIG. 1 (a)) is formed as a single piece (segment) of paired knitting, one semi-cylindrical part 21 (joint trunk part, segment trunk part) and two external parts It is an integral part with the orientation flange 25, and is casted with, for example, “JIS G5502 FCD450-10” as a raw material and mass-produced at a low cost. The semi-cylindrical portion 21 has substantially the same form as one of the two vertically divided cylindrical bodies (i.e., bag-shaped cylindrical bodies) with inward collars at both ends, and the original cylindrical body. Both end portions in the axial direction on the side corresponding to the hollow portion (hereinafter referred to as “inner peripheral side”) are thick-walled portions including the inwardly facing collar 22, and the diameter is increased after the semi-cylindrical portions 21 are mutually coupled. A small-diameter hollow portion (that is, an inner flange portion) that locks the pair of parts 12 and 12 is formed, and an intermediate portion sandwiched between them is a thin-walled portion 23, and the diameter of the semi-cylindrical portion 21 is increased after mutual coupling. A large-diameter hollow portion (that is, a flared portion) serving as a storage space for the pair of portions 12 and 12 is formed.

  The inner diameter of the inward collar 22 is slightly larger than the outer diameter of the neck portion 11 of the reinforcing bar 10 and the inner diameter of the thin portion 23 is the enlarged portion of the reinforcing bar 10 so that it can be fitted to the enlarged diameter pair 12, 12 of the two reinforcing bars 10. Slightly larger than 12 outer diameter. The width of the thin-walled portion 23 = the dimension in the axial direction (that is, the inner space between the inwardly facing collars 22 at both ends of the semi-cylindrical portion 21) corresponds to the thickness of the two enlarged diameter portions 12 ( 1 (e)), the transition from the inward collar 22 to the thin portion 23 is formed on an inclined wall of several degrees to several tens of degrees, and the width of the thin portion 23 on the top side of the inward collar 22 Is wider than the thickness of the two enlarged diameter portions 12, but the width of the thin portion 23 on the heel side of the inward collar 22 is the same as or slightly smaller than the thickness of the two enlarged diameter portions 12. .

  Two outward flanges 25 (see FIG. 1A) are provided, and one outward flange 25 is erected on each of the two straight sides 24 in the body in the semi-cylindrical portion 21. Any of the outward flanges 25 protrudes to the outer peripheral side (the back side of the inner peripheral side) of the semi-cylindrical portion 21 in a form in which the semi-cylindrical portion 21 is extended in a bent direction with two straight sides 24 as a boundary. A bolt insertion hole 26 is formed by being penetrated in the thickness direction. In this joint member 20 (see FIG. 1 (c)), each of the two outward flanges 25 extends in a direction that is bent more sharply than the radial direction of the semi-cylindrical portion 21, and relates to the protruding direction of both flanges. The depression angle is directed to the outer peripheral side of the semi-cylindrical portion 21, and the angle θ is approximately 90 ° (right angle).

  The rebar joint member 30 (see FIG. 1 (b)) is basically the same as the joint member 20 described above, and has a thick part and a thin part including the same semi-cylindrical part 31 and the inward collar 32. The joint member 30 is provided with an outward flange 35 and a bolt insertion hole 36 provided on the portion 33 and the two straight sides 34. In this joint member 30 (see FIG. 1C), two outward flanges 35 are provided. Are extending in a direction that is bent more bluntly than the radial direction of the semi-cylindrical portion 31, and the depression angle θ in the protruding direction of both flanges is on the inner peripheral side of the semi-cylindrical portion 31, contrary to the joint member 20. The shape is oriented and the angle θ is approximately 90 °. Therefore, when the joint member 20 and the joint member 30 are faced to each other, a cylindrical body with inward collars at both ends is formed by the semi-cylindrical part 21 and the semi-cylindrical part 31, and the outside of both joint members is formed. The direction flange 25 and the outward flange 35 are exactly overlapped so that the bolt insertion hole 26 and the bolt insertion hole 36 are connected in a straight line.

In addition, even if the rotation groove 37 for preventing the head of the bolt from spinning idle is formed on the surface of the outward flange of any one of these joint members 20 and 30 that comes to the outside during mutual coupling. Good.
Further, the difference between the outer diameter and the inner diameter of the semi-cylindrical part 31 (= thickness of the thick part including the inward collar), which is the position of the outer peripheral surface of the reinforcing bar 10 and the outer peripheral surface position of the semi-cylindrical part 31 The thickness of the thick portion is set so that it is substantially equal to the difference X (see FIG. 1 (d)), but remains within a dimension equal to or less than the diameter of 13 to 16 mm of the reinforcing bar frequently used for the reinforcing bar of the reinforcing bar structure. Has been. Incidentally, the outward flange 35 protrudes larger than the diameter of the splinter as well as the outward flange 25 because it is necessary to secure a bolt mounting space.

  About the joint member 20 and 30 for reinforcing bars of this embodiment (1st form), the usage aspect to a single connection location is demonstrated referring drawings. FIG. 1 (d) is an end view of a state in which the pair of enlarged diameter portions 12 and 12 are mounted, and FIG. 1 (e) is a side view of the state.

  Here, it is assumed that the neck portion 11 is a reinforcing bar 10 having a diameter of 32 mm, and an end portion having a diameter-enlarged portion 12 having a diameter of 40 mm and a thickness of 15.5 mm is connected in series, and has a size suitable for it. A pair (pair knitting) of the joint members 20 and 30 is manufactured or selected from stock (B: preparation of joint members). Bolts 71 and nuts 72 for fastening the outward flanges 25 and 35 are also prepared, but commercially available products are sufficient.

In this case, first (A: preliminary processing), the enlarged diameter portion 12 is provided at each connected end of the two reinforcing bars 10 to be connected reinforcing bars. Formation of the enlarged diameter part 12 can be easily performed by, for example, hot upsetting using induction heating (see Patent Document 1).
When the enlarged diameter portion 12 is attached, the two reinforcing bars 10 are connected in the longitudinal direction, and the enlarged diameter portions 12 at the ends thereof are abutted with each other. That is, the two reinforcing bars 10 are connected in such a way as to form a pair of enlarged diameter portions 12 and 12 that form a pair in a configuration in which the respective enlarged diameter portions 12 face each other.

Next, as described above, the semi-cylindrical portions 21 and 31 of the paired joint members 20 and 30 are tailored to a size and shape that can be fitted to the enlarged diameter pair 12 and 12 when they are assembled into a cylindrical shape. (B: preparation of joint member), the pair of enlarged diameter parts 12 and 12 is a combined body of paired joint members 20 and 30 having the pair of semi-cylindrical parts 21 and 31 as trunk parts. Enclose and restrain (C: joint member mounting operation).
The joint member mounting operation will be described in detail. The diameter-enlarged portions 12, 12 are provided with the joint member 20 and the joint member 30 facing each other at the abutting portion of the diameter-enlarged portions 12, 12 of the two reinforcing bars 10. Put it on the top.

Then, since the semi-cylindrical portions 21 and 31 that face each other are arranged in a cylindrical shape surrounding the enlarged diameter portions 12 and 12 and the neck portions (neck portions) 11 and 11, the state is maintained. The threaded portion of the bolt 71 is inserted into the bolt insertion holes 26 and 36 that are connected in a straight line.
Then, when the nut 72 is screwed into the nut 72 and tightened with an appropriate torque, the outward flanges 25 and 35 that are also facing each other are fastened and fixed, and the pair of enlarged diameter portions 12 and 12 are also in contact with each other. It is fixed with.
In this manner, the two reinforcing bars 10 are connected in a manner that is fixedly connected with ease and reliability.

  With respect to the reinforcing bar joint members 20 and 30 of this embodiment (first mode), the usage mode of the reinforcing bar structure will be described with reference to the drawings. 2A is a perspective view of a reinforcing bar structure, and FIG. 2B is an end view of a connected state.

  In a reinforcing bar structure embedded in a rectangular column or beam made of reinforced concrete, the reinforcing bars 10 as the main reinforcing bars are arranged in a quadrilateral shape, and when the length is insufficient, the reinforcing bars 10 are connected in the longitudinal direction. 2 with the enlarged diameter portion 12 (see FIG. 2A), each reinforcing bar 10 is a pair-knitted joint in a state where the enlarged diameter portions 12 are attached to each other to form the enlarged diameter portion pair 12,12. The members 20 and 30 are fixedly connected. In that case (refer FIG.2 (b)), when it sees on the basis of the quadrilateral shape arrangement | positioning of the reinforcing bar 10, the joint member 30 is located outside, and the joint member 20 comes inside.

  Then, the outward flanges 25 and 35 are accommodated on or inside the sides of the quadrilateral and do not protrude outside the quadrilateral. For this reason, only the semi-cylindrical portion 31 of the joint member 30 projects to the outer peripheral side of the reinforcing bar 10, but the amount of projecting, that is, the height of one side bulge (see X in FIG. 1 (d)) As described above, since the diameter of the barb 13 is not exceeded, it is not necessary to increase the concrete cover amount on the outer peripheral side of the reinforcing bar structure.

  The configuration of another embodiment (second embodiment) of the joint member for reinforcing bars of the present invention will be described with reference to the drawings. 3A is a side view of the paired joint members 40 and 50 facing each other, FIG. 3B is a plan view, and FIG. 3C is a bottom view and an end view.

  The rebar joint member 40 also corresponds to the semi-cylindrical part 21, the inward collar 22, the thin part 23, the two straight sides 24, the outward flange 25, and the bolt insertion hole 26 of the joint member 20 described above. The semi-cylindrical portion 41, the inwardly facing collar 42, the thin-walled portion 43, the two straight sides 44, the outward flange 45, and the bolt insertion hole 46, but the outward flange 45 is the semi-cylindrical portion. 41 is provided only on one of the two linear two sides 44 and extends in the radial direction of the semi-cylindrical portion 41, and the other of the two linear sides 44 is distributed to both ends thereof. Two hooks 47 are formed in the form. The hand 47 is an inward hand that protrudes inward from the outer peripheral surface side of the semi-cylindrical portion 41. In this connection, the inwardly extending hand 47 can be formed without increasing the thickness of the semi-cylindrical portion 41 and without increasing the outer diameter.

  The reinforcing bar joint member 50 also corresponds to the semi-cylindrical part 31, the inward collar 32, the thin part 33, the two straight sides 34, the outward flange 35, and the bolt insertion hole 36 of the joint member 30 described above. The semi-cylindrical portion 51, the inward collar 52, the thin portion 53, the two straight sides 54, the outward flange 55, and the bolt insertion hole 56. Is provided only on one of the two straight two sides 54 of the semi-cylindrical portion 51 and extends in the radial direction of the semi-cylindrical portion 51, and the other end of the two straight sides 54 has both ends thereof. The hand 58 is formed in a form distributed to each other. The hook 58 is an outward-facing one that protrudes toward the outer peripheral surface with the inner peripheral surface side of the semi-cylindrical portion 51 as the root for engagement with the hand 47. The hook 58 can also be formed without increasing the outer diameter of the semi-cylindrical portion 51.

  About the reinforcing bar joint members 40 and 50 of this embodiment (second embodiment), the usage mode will be described with reference to the drawings. 3D is an end view at the start of mounting on the enlarged diameter portion, FIG. 3E is an end view in the middle of mounting, and FIG. 3F is an end view of the mounting completed state. FIG. 4 is an end view of a large number of usage modes in the reinforcing bar structure.

  When connecting a single location with the joint members 40 and 50, when attaching to the site | part which the diameter expansion parts 12 and 12 of the two reinforcing bars 10 faced each other (refer to Drawing 3 (d)), a joint is there. After covering the member 50, the inward handle 47 is hooked and engaged with the outward handle 58, and the joint member 40 is also covered on the enlarged diameter portions 12 and 12 while maintaining the engagement. Then (see FIG. 3E), the claws 47 and 58 can be locked to each other in the circumferential direction of the semi-cylindrical parts 41 and 51, so that the semi-cylindrical parts 41 that face each other. , 51 are cylindrical while enclosing the enlarged diameter portions 12 and 12 and the neck portions 11 and 11, and the screw portions of the bolts 71 are inserted into the bolt insertion holes 46 and 56 that are linearly connected while maintaining the state.

Then, when the nut 72 is screwed onto the nut 72 and tightened with an appropriate torque, the outward flanges 45 and 55 that are also facing each other are fastened and fixed, and the enlarged diameter portions 12 and 12 are also in contact with each other. Fixed. In the case of the joint members 40 and 50, since there is only one set of the outward flanges 45 and 55, one set of the bolt 71 and the nut 72 is sufficient, and the fastening operation is only required once.
Thus, in this case, the two rebars 10 are more easily and reliably connected in a manner in which they are fixedly connected using the enlarged diameter portions 12 and 12.

In addition, when connecting the reinforcing bars related to the quadrilateral reinforcing bar structure with the joint members 40 and 50 (see FIG. 4), when the four-sided arrangement of the reinforcing bars 10 is taken as a reference, the inwardly extending hand 47 and the outwardly facing hand 58 are The connecting portion is located outside and the connecting portions of the outward flanges 45 and 55 are located inside.
Then, in this case as well, the amount of overhang of the joint member 40 and the joint member 50 (height of the bulge on the side) does not exceed the diameter of the stirrup or falls within the same level, so the amount of concrete cover on the outer peripheral side of the reinforcing bar structure There is no need to increase

  The configuration of another embodiment (third embodiment) of the reinforcing bar joint member of the present invention will be described with reference to the drawings. 5A is a perspective view of the inner side, and FIG. 5B is a perspective view of the outer side.

  The rebar joint member 60 (see FIG. 5A) also includes the semi-cylindrical portion 41, the inward collar 42, the thin portion 43, the two straight sides 44, the outward flange 45, and the bolt insertion of the joint member 40 described above. It includes a similar semi-cylindrical portion 61 corresponding to each of the holes 46, an inwardly facing collar 62, a thin-walled portion 63, two straight sides 64, an outwardly facing flange 65, and a bolt insertion hole 66. The flange 65 is also provided on only one of the two linear sides 64 in the semi-cylindrical portion 61 (one of the two sides of each linear body). On the other side (the remaining one side in each half-cylindrical part), two claws are also provided in this example.

However, unlike the joint member 40, the two claws are divided into an inward winner 67 and an outward winner 68. That is, an inward handle 67 is formed on one end side of the linear side 64, and an outward handle 68 is formed on the other end side.
Therefore, when the joint member 60 and the separate joint member 60 ′ having the same specifications are faced to each other on the inner peripheral sides (that is, in the abdominal alignment), the joint member 60 {inward-facing, outer The hand-to-hand engagement is established between the "facing hand" and the {outward-handing hand, the inward-handing hand} of the joint member 60 ', and the same hand-holding similar to the hands 47 and 58 can be constituted by two members of a single specification. It becomes.

  The use mode of the reinforcing bar joint member 60 (60 and 60 ') of this embodiment (third embodiment) will be described with reference to the drawings. FIG.5 (c) is a side view of a connection state.

  When connecting reinforcing bars with joint members 60 (60 and 60 '), two joint members 60 are prepared, and one of them is inverted and used. That is, when the joint members 60, 60 (60, 60 ') are attached to the diameter-enlarged portions 12, 12 of the two reinforcing bars 10, the joint members 60, 60 are slightly twisted from the facing state. At one part, one outward handle 68 is engaged (meshed) with the other inward handle 67 and returned to the facing state while maintaining the engagement, so that the semi-cylindrical parts 61 and 61 are expanded. 12 and 12.

Then (see FIG. 5C), the semi-cylindrical parts 61, 61 that face each other become cylindrical while enclosing the enlarged diameter parts 12, 12 and the neck parts 11, 11. The bolts 71 are inserted into the bolt insertion holes 66 and 66 that are continuous in the shape, and fastened.
The subsequent operations and results are repeated and will be omitted, but are the same as in the case of the joint members 40 and 50. The same applies when connecting quadrilateral reinforcing bar structures.

  The configuration of another embodiment (fourth embodiment) of the joint member for reinforcing bars of the present invention will be described with reference to the drawings. 6A is a perspective view of the inside of the joint member 70 for reinforcing bars, FIG. 6B is a perspective view of the outward flanges 75 and 75 meeting part and the ring 76, and FIG. 6C is a binding part of the outward flanges 75 and 75. FIG.

This reinforcing bar joint member 70 is different from the above-described joint member 60 in that the outward flange 65 with the bolt insertion hole 66 becomes an outward flange 75 that does not require a hole.
The outward flange 75 is formed in a bowl shape obtained by dividing a round bar having a constant thickness into two in the axial direction. Such an outward flange 75 has a cross-sectional shape perpendicular to the projecting direction, and is formed when the bodies of the pair of semi-cylindrical portions 61 and 61 face each other for mutual coupling. The ring 76 can be externally fitted to the 75 and 75 meeting parts to bind the meeting parts. The ring 76 is easily and inexpensively made by cutting a metal pipe, for example.

In this case as well, when the enlarged diameter portion 12 is formed in the reinforcing bar 10 (A: preliminary processing) and the paired reinforcing bar joint members 70, 70 matching the same are prepared (B: preparing a joint member), the enlarged diameter is obtained. The pair of parts 12 and 12 are surrounded by an interconnected body of joint members 70 and 70 (the C: joint member mounting work). In this case, when the outer flanges 75 and 75 are assembled and fixed together, the bolts and nuts are not fastened. Ring external fitting and binding is performed using the ring 76.
The flanges 75, 75 are easily bound together by, for example, sandwiching the facing flanges 75, 75 facing each other with, for example, pliers, and fitting the ring 76 to the outward flanges 75, 75 formed into a round bar shape. can do. In addition, the ring outer fitting binding of the outward flange 75 is applicable also to the joint members 20, 30, 40, and 50 described above.

  The configuration of another embodiment (fifth embodiment) of the reinforcing bar connecting method of the present invention will be described with reference to the drawings. 7A is a side view of the ends of the reinforcing bars 10 facing each other, FIG. 7B is a cross-sectional view of the semi-cylindrical portion of the reinforcing bar joint member 80, and FIG. 7C is a plan view of the spacer 81. FIG. 4D is a plan view of the spacer 82, and FIG. 4E is a table illustrating adjustment of the length after connecting the reinforcing bars.

  The reinforcing bar joint member 80 (see FIGS. 7 (a) and 7 (b)) may be in any form of the above-described joint members 20, 30, 40, 50, 60, 70, but two connected members. In order to be able to adjust the length after the rebar 10 is connected, the inner distance L between the inwardly facing collars at both ends in the semi-cylindrical portion constituting the reinforcing bar joint member 80 is the diameter of the enlarged diameter portion λ (that is, the rebar 10 A dimension (L = 2λ + m) obtained by adding a margin m to a dimension obtained by doubling the dimension in the axial direction of the enlarged diameter portion 12).

  Spacers 81 and 82 are used in combination for the reinforcing bar joint member 80 (see FIGS. 7C and 7D). A disc-shaped spacer 81 (see FIG. 7C) is inserted in the gap (position b in FIG. 7A) between the pair of enlarged diameter portions 12 and 12, and an arc-shaped spacer 82 (see FIG. 7D). Is inserted between the enlarged diameter portion 12 and the inward collar of the reinforcing bar joint member 80 (positions a and c in FIG. 7A) so as to be hung on the neck portion 11 of the reinforcing bar 10. A spacer 82 can be used instead of the spacer 81.

As a specific example, when the margin m is 6 mm and the thicknesses of the spacers 81 and 82 are 1 mm, the play caused by the margin m is erased by interposing six spacers. In this case, the length of the reinforcing bars to be connected is reduced by the amount of reinforcing bars after connection due to the introduction of the margin (in the following example, 6 ÷ 2 = 3 mm reduction).
In this case, the length of the reinforcing bars after connection is adjusted in units of 1 mm by adjusting the knitting of the six spacers at the reinforcing bar joint member 80 in the axial direction.

  That is, (see FIG. 7 (e)), when the insertion between the expanded diameter portions 12 and 12 at the position b is zero, the neck portion 11 is inserted at the a or c position with six (mode # 1) and the reinforcing bars after connection. The length is 3 mm shorter than the reference length (the original connection length in the case where the above margin is not introduced). When there is only one insertion at the b position, there are five insertions at the a or c position (mode # 2). The length of the rebar after connection is 2 mm shorter than the reference length, and when the number of insertions at the b position is two, the number of insertions at the a or c position is four (mode # 3), and the length of the rebar after connection is 1 mm shorter than the reference length.

  In addition, when the insertion at the b position is three, the insertion at the a or c position is three (mode # 4), and the rebar length after connection is equal to the reference length, and when the insertion at the b position is four, a Or the insertion into the c position is 2 sheets (mode # 5), and the length of the reinforcing bar is 1 mm longer than the reference length after connection, and when the insertion into the b position is 5 sheets, the insertion into the a or c position is 1 sheet (mode) # 6) The rebar length after connection is 2mm longer than the reference length. When the number of insertions at position b is 6, the insertion at the a or c position is 0 (mode # 7). The rebar length after connection is 3mm from the reference length. become longer. Thereby, the length dispersion | variation of a to-be-connected reinforcing bar is compensated to the range of +/- 3mm per 1mm unit.

Note that three types of spacers 81 and 82 having different thicknesses, for example, thicknesses of 1 mm, 2 mm, and 3 mm, may be prepared, and appropriate ones may be selected and combined.
Further, the spacer can be made thinner than 1 mm to further finely adjust the length of the reinforcing bar after connection.

The configuration of another embodiment (sixth embodiment) of the reinforcing bar connecting method of the present invention will be described with reference to the drawings. In addition, description of this embodiment is related with the dimension item of the coupling part in this invention, and those correlation and significance.
8A is a cross-sectional view of two reinforcing bars 10 connected by a reinforcing bar joint member 90, and FIG. 8B is an outer diameter dimension of the enlarged diameter portion 12 of the reinforcing bar 10 and a piece of the reinforcing bar joint member 90. It is some graphs which show the regulation conditions etc. regarding the meat swelling height X.

Assuming that the neck diameter of the reinforcing bar 10 is d, the bulge height of the single-walled portion 12 is h, and 2h / d≡k, the diameter expansion magnification is (d + 2h) / d = 1 + k. Further, X = h + t, where X is the height of the single-wall bulge of the reinforcing bar joint member 90 and t is the thickness of the thin portion of the reinforcing bar joint member 90 (see FIG. 8A). Here, in order that the joint member 90 does not break due to the axial tension, the strength-dominating portion of the joint member 90, that is, the transverse area A = (π / 4) {(d + 2X) ² − (d + 2X−2t) ² } = (Π / 4) {(d + 2h + 2t) ² − (d + 2h) ² } = (π / 4) [{(1 + k) d + 2t} ² − {(1 + k) d} ² ] is the cross-sectional area S = ( It is a necessary condition that π / 4) d ² or more, that is, A ≧ S. Therefore, when the minimum thickness t _MIN of the thin portion necessary to satisfy this condition is obtained from the above equation group, t _MIN = (1/2) [√ {(d + 2h) ² + d ² } − (d + 2h)] = (D / 2) [√ {(1 + k) ² +1} − (1 + k)].

Taking these conditions into consideration, the horizontal axis takes the nominal diameter of the reinforcing bar in units of mm (reinforcing bar diameter d), the vertical axis also adopts mm, and the enlarged-diameter portion bulge height h (solid line), Joint member thin part thickness t (short wave line), joint member single wall bulge height X (long wave line), common reinforcing bar diameter of the barb that is attached to the connected reinforcing bar (13mm is a one-dot chain line, 16mm is A two-dot chain line graph is shown (see FIG. 8B). Note that the solid line graph h1 indicates the bulge height h of the enlarged diameter portion when the expansion ratio (1 + k) = 1.2, and the solid line graph h2 sets the expansion ratio (1 + k) = 1.5 and the upper limit value. , And the short wave line graphs t1 and t2 indicate the thickness t of the joint member required when h = h1 and h2 (that is, the above t _MIN). ), And long wave line graphs X1 and X2 indicate the height X of the joint member flare that will occur when h = h1 and h2, respectively.

  From these graphs, the outer diameter dimension (d + 2h) of the expanded diameter portion 12 has an expanded magnification ratio (1 + k) with respect to the reinforcing bar base material in the range of 1.2 to 1.5, and the expanded diameter piece from the reinforcing bar base material. If the wall bulge height h is suppressed to 8 mm or less, a measure for ensuring the required thickness t of the thin wall portion that governs the strength in the axial direction of the joint member 90 attached to the enlarged diameter portion 12, and the joint member 90 or less of the joint member single-wall bulging height X from the connected reinforcing bar 10 of the connected reinforcing bar connecting portion is equal to or less than the diameter of the common reinforcing bar diameter (13 mm or 16 mm) of the bellows bar that is attached to the connected reinforcing bar. In other words, a process for preventing the increase in the required cover thickness due to the attachment of the joint member 90 and avoiding a derivative cost increase related to the connection is completed at the same time. The expansion ratio 1 + k is set to 1.2 or more (that is, h ≧ 0.1d) because the engagement (prevention) of the expanded-diameter pair 12 and 12 by the joint member 90 depends on the diameter of the reinforcing bar 10. It is for securing.

1 shows a structure and a mounting state of a pair of reinforcing bar joint members according to an embodiment (first form) of the present invention, wherein (a) is a perspective view of one joint member, and (b) is a joint member of the other. A perspective view, (c) is an end view where the surfaces face each other, (d) is an end view in a connected state, and (e) is a side view in a connected state. A large number of use states are shown, (a) is a perspective view of a reinforcing bar structure, and (b) is an end view of a connected state. About other embodiment (2nd form) of this invention, the structure of the joint member for reinforcing bars which forms a pair, and its mounting state are shown, (a) is a side view where it faced, (b) is a top view, (c) is a bottom view / end view, (d) is an end view at the start of connection, (e) is an end view during connection, and (f) is an end view in a connected state. It is an end view of the connection state at the time of many use. About other embodiment (3rd form) of this invention, the structure of the joint member for reinforcing bars is shown, (a) is an inside perspective view, (b) is an outside perspective view, (c) is a side view of a connection state It is. About other embodiment (4th form) of this invention, the structure of the joint member for reinforcing bars is shown, (a) is a perspective view of an inner side, (b) is a perspective view of an outward flange meeting part and a ring, (c) FIG. 6 is a perspective view of an outward flange binding portion. About other embodiment (5th form) of this invention, the structure of the joint member for reinforcing bars is shown, (a) is a side view where the end surfaces of the reinforcing bars face each other, (b) is a half of the joint member for reinforcing bars. Sectional drawing of a cylindrical part, (c) And (d) is a top view of a spacer, (e) is an adjustment condition table of reinforcing bar length. About other embodiment (6th form) of this invention, the structure of the joint member for reinforcing bars is shown, (a) is sectional drawing of a connection state, (b) is the outer diameter size of the enlarged diameter part of a reinforcing bar, and the joint for reinforcing bars It is a graph which shows the regulation conditions regarding the single-sided swelling height of a member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Reinforcing bar (connected reinforcing bar), 11 ... Neck part, 12 ... Diameter-expanding part, 13 ... Abalone muscle,
20 ... Reinforcing bar joint member (segment),
21 ... Semi-cylindrical part (the trunk part of the joint member, the trunk part of the segment),
22 ... Inward collar (small diameter hollow part),
23 ... Thin part (large-diameter hollow part, lumen inflated part, enlarged-diameter part accommodating part, place part),
24: Two straight sides, 25: Outward flange, 26: Bolt insertion hole,
30 ... Joint member for rebar (segment),
31 ... Semi-cylindrical part (the trunk part of the joint member, the trunk part of the segment),
32 ... Inward collar (small diameter hollow part),
33 ... Thin-walled part (large-diameter hollow part, lumen inflated part, enlarged-diameter part-receiving part, full part),
34: Two straight sides, 35 ... Outward flange, 36 ... Bolt insertion hole, 37 ... Stop groove,
40 ... Reinforcing bar joint member, 41 ... Semi-cylindrical part, 42 ... Inward collar,
43 ... Thin part, 44 ... Two straight sides, 45 ... Outward flange,
46 ... Bolt insertion hole, 47 ... Inward claws,
50 ... Reinforcing bar joint member, 51 ... Semi-cylindrical part, 52 ... Inward collar,
53 ... Thin wall part, 54 ... Two straight sides, 55 ... Outward flange,
56 ... Bolt insertion hole, 58 ...
60 ... Reinforcing bar joint member, 61 ... Semi-cylindrical part, 62 ... Inward collar,
63 ... Thin wall part, 64 ... Two straight sides, 65 ... Outward flange,
66 ... Bolt insertion hole, 67 ... Inward-facing claws, 68 ... Outward-facing claws,
70 ... Reinforcing bar joint member, 75 ... Outward flange, 76 ... Ring,
80: Joint member for reinforcing bar, 81, 82: Spacer,
90 ... Joint member for reinforcing steel bars

Claims (9)

  A diameter-expanded portion is provided at each connected end of the two reinforcing bars to be connected, and the two reinforcing bars are paired in a configuration in which the respective enlarged diameter portions face each other. After connecting to the form to form the enlarged diameter part pair, the enlarged diameter part pair has a form in which a cylindrical body with inward collars at both ends is vertically divided into two parts, and the enlarged diameter part pair is external to the enlarged diameter part pair. By enclosing and constraining a pair of semi-cylindrical parts with inwardly facing collars at both ends, which are tailored to a size and shape that can be fitted, with a joint member of a pair knitting joint member, A method for connecting reinforcing bars, comprising connecting reinforcing bars.   The outer diameter dimension of the expanded diameter part is a dimension in which the expansion ratio relative to the reinforcing bar base material is in the range of 1.2 to 1.5, and the height of the single-wall bulge from the reinforcing bar base material is suppressed to 8 mm or less. The reinforcing bar connecting method according to claim 1, wherein:   The internal spacing between the inwardly facing collars at both ends of the semi-cylindrical part constituting the joint member is set to a dimension obtained by adding a margin to a dimension obtained by doubling the axial dimension of the enlarged diameter part. The play caused by the margin is eliminated by inserting one or more spacers, and the knitting of the spacer in the axial direction of the joint member and the insertion thickness is adjusted. The length after the connection of the two to-be-connected reinforcing bars is adjusted by this, The reinforcing bar connecting method according to claim 1 or 2.   It is a joint member for reinforcing bars used for the connecting method of the reinforcing bar described in any one of claims 1 to 3, Comprising: In the division of the vertical division of the cylindrical body in each body of the semi-cylindrical part of the pair A joint member for reinforcing bars, characterized in that a flange-like outward flange is provided on each of the corresponding two sides of each linear body as a foothold for mutually connecting the bodies of the semi-cylindrical parts.   In the outward flange, the orientation knitting of each outward flange is set so that the depression angle of the outward flange joint portion formed at two locations by the mutual connection is 90 ° or less. Item 5. A reinforcing bar joint member according to Item 4.   It is a joint member for reinforcing bars used for the connecting method of the reinforcing bar described in any one of claims 1 to 3, Comprising: In the division of the vertical division of the cylindrical body in each body of the semi-cylindrical part of the pair One of the corresponding two sides of each linear body is provided with a flange-like outward flange that serves as a foothold for mutually connecting the bodies of the semi-cylindrical parts. A rebar joint member, characterized in that a remaining one of the two sides is provided with a gripping structure capable of mutually connecting the semi-cylindrical parts with respect to their circumferential direction.   The handle structure provided on the remaining one side is such that the direction of the handle is inwardly directed at one end side of the one side with the outer peripheral surface side of the semi-cylindrical portion as a root, and the half-handed side is provided on the other end side. 7. The structure according to claim 6, wherein the tubular body is outwardly rooted from an inner peripheral surface side and has a structure in which the mutual coupling body can be constituted by two bodies having a single specification. Reinforcing bar joint members.   The reinforcing bar joint member according to any one of claims 4 to 7, wherein a bolt insertion hole is provided in the outward flange.   The outward-facing flange has a cross-sectional shape orthogonal to the protruding direction at the meeting portion of the pair of flanges formed when the bodies of the pair of semi-cylindrical portions face each other for the mutual connection. The joint member for reinforcing bars according to any one of claims 4 to 7, wherein a ring-shaped member is externally fitted so that the meeting portion can be bound.

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