JPH10131303A - Joint construction of reinforcement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide deformed bar joint construction excellent in work efficiency with high strength at a low cost. SOLUTION: The joint construction to a reinforcement is so constituted that joint sleeves 3 and 4 are fixed to every front end of deformed bars 1 and 2 in advance, and a joint bolt 5 is screwed in one or the other of the sleeves in advance. After one reinforcing bar 1 is fixed at a construction site, the sleeve of the other reinforcing bar 2 is positioned, and this reinforcing bar is rotated to butt both reinforcing bars through a bolt. Then, the sleeves 3 and 4 cut a pipe-like material having the hexagonal circumference and circular inside diameter in specific length, a female screw section 3a is provided within specific length from one end, the front end of the reinforcing bar is inserted in a hole section in the other end to fix, and binding is made by crushing the hexagonal corner section with a press device. By the constitution, the corner section is greatly deformed at the inside circumferential surface to obtain strong binding post-tensioning force. Since the diameter of the female screw section is enlarged, the diameter of the joint bolt can be increased to obtain joint construction with high bonding strength without requiring any high-quality material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure of reinforcing bars for connecting deformed reinforcing bars in a construction site such as civil engineering or a building by abutting each other.

[0002]

2. Description of the Related Art As means for butt connection of deformed reinforcing bars used in construction sites such as civil engineering and construction, so-called mechanical joints using screw mechanisms in addition to welding by various welding methods are employed.

As shown in FIG. 6, such a mechanical joint is provided with a sleeve 3 in advance at each tip of a pair of deformed reinforcing bars 31 and 32 to be butt-connected at a factory.
What fixed 3,34 is adopted. Double sleeve 3
Reference numerals 3 and 34 are used to connect the reinforcing bars by butt connection by connecting them via connection bolts 35. Each of the sleeves fixes one of the rebars 31 at the construction site, screws the external thread 35a of the connection bolt 35 into the female thread 33a of the sleeve at the tip of the rebar, and further connects the other rebar to the connection bolt. The internal threads of the sleeve 34 at the distal end of the screw 32 are screwed to connect the rebars. In the connection work, a connection bolt is screwed into one sleeve in advance, the female screw hole of the sleeve of the other reinforcing bar is aligned with the tip of the connection bolt, and the reinforcing bar is rotated with a torque wrench or the like. .

[0004]

The prior art described above is
It is being widely adopted because it excels in productivity and workability at construction sites. However, the following has been pointed out in terms of connection strength and construction cost. First, the joint sleeve according to the prior art is one in which the tip of a deformed reinforcing bar is inserted into one end of an outer-circular tubular member and pressure is applied from the outer periphery in a radial direction to perform crimping. Over, the inner peripheral surface of the sleeve has substantially uniform crimp strength. This means that a large crimping force is required as a whole. Secondly, since connection bolts screwed into both sleeves are required to correspond to the strength of the rebar, heat-treated products such as chrome and molybdenum steel are used for the bolts, so There is a problem that connecting bolts are expensive. Third, since the outer periphery of the sleeve is circular, a torque wrench or the like is used as described above to rotate one of the rebars in the connection work at the construction site. There was an inconvenience that a wrench could not be used.

[0005]

In order to solve the above-mentioned problems, the present invention employs the following means. First,
First, as a joint sleeve, a sleeve member obtained by cutting a tubular material having an outer periphery formed into a polygon such as a hexagon into a predetermined length is employed, and an internal thread portion is provided within a predetermined length range from one end of the sleeve member. The front end of the rebar is inserted and crimped in the range from the other end to the inner end of the female thread. In this crimping, the compression force is applied so that each corner of the polygon is deformed toward the center, so that the polygon is deformed. Since the force does not work, there is not so much compressive deformation force. As a result, the inner peripheral surface corresponding to each corner is deformed toward the center, and is compressed and deformed by a strong force so as to be hardly inserted around the reinforcing bar. On the other hand, since the amount of deformation of the inner peripheral surface corresponding to the side of the polygon is small, the crimping force is weak. Due to the strength of the crimping force, a strong crimping force is obtained as a whole between the reinforcing bar and the sleeve.

[0006] Second, since the internal thread portion into which the connection bolt is screwed is provided with an internal thread on the inner peripheral surface of the tubular material, the nominal diameter (outer diameter) of the connection bolt is inevitable. Is larger than the diameter of the rebar. For this reason, the resistance to the tensile load acting on the connection bolts increases, and it is not necessary to use heat-treated products of chrome and molybdenum steel used in the conventional technology as bolt materials, and general structural steel is used. It is possible to do.

Third, since the outer periphery of the area where the female thread portion of the connection sleeve is engraved is polygonal, a wrench such as a wrench is attached to two opposing sides during connection work at the construction site. By adjusting the distance, the rebar can be turned, so that the connection work at the construction site is facilitated.

[0008]

Next, an example of an embodiment of the present invention will be described. As shown in FIG. 1, an embodiment of the present invention is shown, in which connection sleeves 3 and 4 are fixed to respective ends of a pair of deformed reinforcing bars 1 and 2 to be butt-connected, and an internal thread of each sleeve is fixed. The connection bolts 5 in the form of studs are screwed into the portions 3a and 4a to connect them.

FIG. 2 shows one deformed reinforcing bar 2 and a connecting sleeve 4 fixed to the tip thereof.
The female screw 4a is engraved from the front end (left end) to approximately one third of the entire length. The distal end of the deformed rebar 2 is inserted into the insertion hole 4b of the rebar having the same inner diameter as the internal thread 4a, and the area where the rebar is inserted is compressed and deformed from the outer periphery toward the center. I have.

Next, with respect to the joint structure of the present invention, steps from the production of the joint sleeve to the connection of the deformed reinforcing bars will be described. As the material of the sleeve, a tubular steel material obtained by forming a circular steel pipe into a hexagonal outer periphery and a circular inner periphery by drawing is adopted. This tubular material is cut to a predetermined length, and an internal thread is cut from one end thereof to a predetermined length range to obtain a sleeve member 13 as shown in FIG.
In the figure, the inner diameter of the female screw portion 13a is made to be the same as the inner diameter of the insertion hole portion 13b of the deformed reinforcing bar, so that it is not necessary to drill a pilot hole for the female screw. The female thread portion is formed by tapping or the like in a range of about one third of the entire length from one end of the sleeve member.

Next, the tip of the deformed reinforcing bar 1 is inserted into the hole 13b of the completed sleeve member 13. As you know,
Since the ridge 1a for retaining is provided on the outer periphery of the deformed reinforcing bar, the size of the hole is determined so that the diameter of the portion provided with the ridge corresponds to the inner diameter of the hole. It is.
That is, it is desirable to adjust the inner diameter of the hole 13b so that the tip of the reinforcing bar can be lightly pressed into the hole.

Next, as shown in FIG. 4, in a state where the sleeve member 13 is inserted into the tip of the reinforcing bar 1, a compressive force is applied from both the upper and lower directions using the mold 4 of the press device from around the sleeve member. The two are crimped by deforming the corner 13c into a round shape. The mold 4 is provided with semi-circular grooves 4a, 4a in the longitudinal direction in two dies. The sleeve member 13 is fed into these grooves 4a so as to surround the area to be crimped, and a force is applied to the die from above and below so that the sleeve member can be deformed.

When a force is applied to the outer periphery of the sleeve member 13 by the grooves 4a, 4a of the mold 4, the inner peripheral surface of the groove initially acts on only the outer corners 13a of the sleeve member to move the inner peripheral surface to the center. And squash them. As a result, the inner surface of the hole 13b of the sleeve member projects inward so that the inside of the deformed corner 13c bulges, so that the inner surface of the reinforcing bar 1 is inserted into the inner surface. When a force is further applied to the die, the corner 13c of the sleeve member is crushed, and the outer periphery is deformed into a substantially circular shape, so that the inner peripheral surface is pressed against the outer periphery of the reinforcing bar 1. In this crimping, as described above, the corner portion 13c of the sleeve member is largely deformed toward the center, so that the crimping force at this portion is increased. On the other hand, since the deformation amount of each side is small, the pressing force is weak, and when viewed as a whole, it is in a strong and weak distribution state of a wave shape, and the whole is a large pressing force. I have. It should be noted that the outer periphery of the area where the internal thread portion 13a of the sleeve member 13 is engraved is maintained in a hexagonal shape because there is no deformation by the die. The connection sleeve 4 shown in FIG. 2 is obtained by fixing the sleeve member 13 to the tip of the reinforcing bar 1 in this manner.

Next, a description will be given of a connection procedure of the reinforcing bars by the joint structure of the reinforcing bars according to the present invention. As is well known, deformed reinforcing bars are laid out vertically and horizontally and vertically at a reinforced concrete construction site, and the ends of the reinforcing bars are butt-connected to each other. It can be easily performed by adopting the joint structure.

First, one reinforcing bar 1 having a sleeve 3 fixed to the tip is fixedly installed at a construction site. Next, the connecting bolt 5 having a predetermined length as shown in FIG.
Screw into a. The screwing depth of the bolt is such that the bolt is screwed deeply until it stops in the internal thread portion, so that sufficient joint strength is obtained. Next, the sleeve 4 of the reinforcing bar 2 of the other party
And the female screw portion 4a is screwed into the connection bolt 5. This screwing is performed by rotating the reinforcing bar 2 of the other party. The rotation of the rebar may be performed by applying a torque by applying a large spanner to a hexagonal portion on the outer periphery of the sleeve 4. The rotation of the rebar may be applied with a torque using a torque wrench or another tool. The connection work uses the hexagonal part of the sleeve,
Since the rebar is rotated, a large torque can be easily obtained, and there is an advantage that the connecting operation is extremely easy.

In the above description, the polygon of the sleeve is described as a hexagon, but this may be a square or an octagon. In addition, as for the form of connection of the reinforcing bar by the sleeve, in addition to the connection by rotating one of the reinforcing bars as described above, the connection bolt is formed by turning the bolt into a right-hand screw and a left-hand screw, and connecting the bolt by rotating the bolt. In some cases, the bolt is screwed deeply, then the sleeve of the other party is approached, the bolt is unscrewed and screwed to the other party, and the locking nut is used to prevent loosening. In these cases, the rebar itself is not rotated, but the present invention provides a strong crimping force and does not diminish the advantages of the present invention that enable the use of low-quality bolts. .

Further, the present invention is applied to a case where the reinforcing bars are butt-connected with each other via connecting bolts.
As another means, it is also possible to connect without using this connection bolt. For example, in a factory, a sleeve member is fixed to the tip of one rebar in advance, and at the construction site, the tip of the other rebar is inserted from the hole of the sleeve and crimped, so that each rebar is crimped. It is also possible to connect the tips by directly abutting each other. A strong connection force is obtained by crushing and crimping the corners of the polygon,
In addition, it is not necessary to engrave the connection bolt and the nail screw portion, and it is also possible to reduce the construction cost because only one sleeve is required. However, there is a disadvantage that it can be adopted only under limited conditions such as horizontal bar arrangement at present.

[0018]

According to the present invention, a sleeve member having a polygonal outer periphery and a circular inner periphery is used, the distal end of a deformed reinforcing bar is inserted from one end, and the inserted portion is compressed and deformed toward the center. In this way, the sleeve is crimped to the reinforcing bar, so that the crimping strength is increased and a large bonding force is obtained. Also,
Since the inner diameter of the rebar insertion hole of the sleeve member and the inner diameter of the female thread are the same, the diameter of the connection bolt to be screwed with this female thread becomes larger, and it can withstand a tensile load equal to or greater than that of the deformed rebar. Has become. As a result, it is not necessary to use a high-grade material such as chromium-molybdenum steel as in the prior art as a bolt material, which contributes to a reduction in construction cost. The polygonal side portion of the sleeve is suitable for directly applying a wrench or the like, so that workability at the site can be improved.

[Brief description of the drawings]

FIG. 1 is a partially cutaway sectional view showing a main part of the present invention.

FIG. 2 is a cross-sectional view showing a state in which a sleeve is fixed to the tip of a deformed reinforcing bar.

FIG. 3 is a sectional view showing a sleeve member.

FIG. 4 is a perspective view showing a procedure for fixing a sleeve member to a reinforcing bar.

FIG. 5 is a front view of a connection bolt.

FIG. 6 is a partially cutaway sectional view showing a conventional technique.

[Explanation of symbols]

 1, 2 Reinforcing bar 3, 4 Sleeve 3a, 4a Female thread 5 Connection bolt 13 Sleeve member 13a Female thread 13c Corner

[Procedure amendment]

[Submission date] February 5, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

[Title of the Invention] Reinforcing bar joint structure

[Claims]

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure of reinforcing bars for connecting deformed reinforcing bars in a construction site such as civil engineering or a building by abutting each other.

[0002]

2. Description of the Related Art As means for butt connection of deformed reinforcing bars used in construction sites such as civil engineering and construction, so-called mechanical joints using screw mechanisms in addition to welding by various welding methods are employed.

As shown in FIG. 6, such a mechanical joint is provided with a sleeve 3 in advance at each tip of a pair of deformed reinforcing bars 31 and 32 to be butt-connected at a factory.
What fixed 3,34 is adopted. Double sleeve 3
Reference numerals 3 and 34 are used to connect the reinforcing bars by butt connection by connecting them via connection bolts 35. Each of the sleeves fixes one of the rebars 31 at the construction site, screws the external thread 35a of the connection bolt 35 into the female thread 33a of the sleeve at the tip of the rebar, and further connects the other rebar to the connection bolt. The internal threads of the sleeve 34 at the distal end of the screw 32 are screwed to connect the rebars. In the connection work, a connection bolt is screwed into one sleeve in advance, the female screw hole of the sleeve of the other reinforcing bar is aligned with the tip of the connection bolt, and the reinforcing bar is rotated with a torque wrench or the like. .

[0004]

The prior art described above is
It is being widely adopted because it excels in productivity and workability at construction sites. However, the following has been pointed out in terms of connection strength and construction cost. First, the joint sleeve according to the prior art inserts the tip of a deformed reinforcing bar into one end of an outer round tubular member and applies a radial force from the outer periphery to crimp the reinforcing bar. Over, the inner peripheral surface of the sleeve has a substantially uniform pressing force . This means that a large crimping force is required as a whole. Secondly, since connection bolts screwed into both sleeves are required to correspond to the strength of the rebar, heat-treated products such as chrome and molybdenum steel are used for the bolts, so There is a problem that connecting bolts are expensive. Third, since the outer circumference of the sleeve is circular, a torque wrench or the like is used to rotate one of the rebars in the connection work at the construction site as described above. There was an inconvenience that a wrench could not be used.

[0005]

In order to solve the above-mentioned problems, the present invention employs the following means. First,
First, as a joint sleeve, a sleeve member obtained by cutting a tubular material having an outer periphery formed into a polygon such as a hexagon into a predetermined length is employed, and an internal thread portion is provided within a predetermined length range from one end of the sleeve member. The front end of the rebar is inserted and crimped in the range from the other end to the inner end of the female thread. In this crimping, the compression force is applied so that each corner of the polygon is deformed toward the center, so that the polygon is deformed. Since the force does not work, there is not so much compressive deformation force. As a result, the inner peripheral surface corresponding to each corner is deformed toward the center, and is compressed and deformed by a strong force so as to be hardly inserted around the reinforcing bar. On the other hand, since the amount of deformation of the inner peripheral surface corresponding to the side of the polygon is small, the crimping force is weak. Due to the strength of the crimping force, a strong crimping force is obtained as a whole between the reinforcing bar and the sleeve.

[0006] Second, since the internal thread portion into which the connection bolt is screwed is provided with an internal thread on the inner peripheral surface of the tubular material, the nominal diameter (outer diameter) of the connection bolt is inevitable. Is larger than the diameter of the rebar. For this reason, the resistance to the tensile load acting on the connection bolts increases, and it is not necessary to use heat-treated products of chrome and molybdenum steel used in the conventional technology as bolt materials, and general structural steel is used. It is possible to do.

Third, since the outer periphery of the area where the female thread portion of the connection sleeve is engraved is polygonal, a wrench such as a wrench is attached to two opposing sides during connection work at the construction site. By adjusting the distance, the rebar can be turned, so that the connection work at the construction site is facilitated.

[0008]

Next, an example of an embodiment of the present invention will be described. As shown in FIG. 1, an embodiment of the present invention is shown, in which connection sleeves 3 and 4 are fixed to respective ends of a pair of deformed reinforcing bars 1 and 2 to be butt-connected, and an internal thread of each sleeve is fixed. The connection bolts 5 in the form of studs are screwed into the portions 3a and 4a to connect them.

FIG. 2 shows one deformed reinforcing bar 2 and a connecting sleeve 4 fixed to the tip thereof.
The female screw 4a is engraved from the front end (left end) to approximately one third of the entire length. The distal end of the deformed rebar 2 is inserted into the insertion hole 4b of the rebar having the same inner diameter as the internal thread 4a, and the area where the rebar is inserted is compressed and deformed from the outer periphery toward the center. I have.

Next, with respect to the joint structure of the present invention, steps from the production of the joint sleeve to the connection of the deformed reinforcing bars will be described. The material of the sleeve, are adopted what was tubular material whose inner circumference formed by formed in a circular shape the steel tube outer circumference is hexagonal by drawing. This tubular material is cut to a predetermined length, and an internal thread is cut from one end thereof to a predetermined length range to obtain a sleeve member 13 as shown in FIG. In the figure, the inner diameter of the female screw portion 13a is made to be the same as the inner diameter of the insertion hole portion 13b of the deformed reinforcing bar, so that it is not necessary to drill a pilot hole for the female screw. The female thread portion is formed by tapping or the like in a range of about one third of the entire length from one end of the sleeve member.

Next, the tip of the deformed reinforcing bar 1 is inserted into the hole 13b of the completed sleeve member 13. As you know,
Since the ridge 1a for retaining is provided on the outer periphery of the deformed reinforcing bar, the size of the hole is determined so that the diameter of the portion provided with the ridge corresponds to the inner diameter of the hole. It is.
That is, it is desirable to adjust the inner diameter of the hole 13b so that the tip of the reinforcing bar can be lightly pressed into the hole.

Next, as shown in FIG. 4, in a state in which the sleeve member 13 is inserted into the tip of the reinforcing bar 1, a compressive force is applied from both the upper and lower directions using the mold 6 of the pressing device from around the sleeve member. The two are crimped by deforming the corner 13c into a round shape. The mold 6 is provided with semi-circular grooves 6a , 6a in the longitudinal direction in two dies. The sleeve member 13 is fed into these grooves 6a so as to surround the area to be crimped, and a force is applied to the dies from above and below so that the sleeve member can be deformed.

When a force is applied to the outer periphery of the sleeve member 13 by the grooves 6a , 6a of the mold 6 , the inner peripheral surface of the groove initially exerts a force only on the outer corners 13a of the sleeve member so that the center is formed. And squash them. As a result, the inner surface of the hole 13b of the sleeve member projects inward so that the inside of the deformed corner 13c bulges, so that the inner surface of the reinforcing bar 1 is inserted into the inner surface. When a force is further applied to the die, the corner 13c of the sleeve member is crushed, and the outer periphery is deformed into a substantially circular shape, so that the inner peripheral surface is pressed against the outer periphery of the reinforcing bar 1. In this crimping, as described above, the corner portion 13c of the sleeve member is largely deformed toward the center, so that the crimping force at this portion is increased. On the other hand, since the deformation amount of each side is small, the pressing force is weak, and when viewed as a whole, it is in a strong and weak distribution state of a wave shape, and the whole is a large pressing force. I have. It should be noted that the outer periphery of the area where the internal thread portion 13a of the sleeve member 13 is engraved is maintained in a hexagonal shape because there is no deformation by the die. The connection sleeve 4 shown in FIG. 2 is obtained by fixing the sleeve member 13 to the tip of the reinforcing bar 1 in this manner.

Next, a description will be given of a connection procedure of the reinforcing bars by the joint structure of the reinforcing bars according to the present invention. As is well known, deformed reinforcing bars are laid out vertically and horizontally and vertically at a reinforced concrete construction site, and the ends of the reinforcing bars are butt-connected to each other. It can be easily performed by adopting the joint structure.

First, one reinforcing bar 1 having a sleeve 3 fixed to the tip is fixedly installed at a construction site. Next, the connecting bolt 5 having a predetermined length as shown in FIG.
Screw into a. The screwing depth of the bolt is such that the bolt is screwed deeply until it stops in the internal thread portion, so that sufficient joint strength is obtained. Next, the sleeve 4 of the reinforcing bar 2 of the other party
And the female screw portion 4a is screwed into the connection bolt 5. This screwing is performed by rotating the reinforcing bar 2 of the other party. The rotation of the rebar may be performed by applying a torque by applying a large spanner to a hexagonal portion on the outer periphery of the sleeve 4. The rotation of the rebar may be applied with a torque using a torque wrench or another tool. The connection work uses the hexagonal part of the sleeve,
Since the rebar is rotated, a large torque can be easily obtained, and there is an advantage that the connecting operation is extremely easy.

[0016] In the above invention, but are described a polygonal sleeve as hexagonal, which may be octagonal in rectangle. In addition, as for the form of connection of the reinforcing bar by the sleeve, in addition to the connection by rotating one of the reinforcing bars as described above, the connection bolt is formed by turning the bolt into a right-hand screw and a left-hand screw, and connecting the bolt by rotating the bolt. In some cases, the bolt is screwed deeply, then the sleeve of the other party is approached, the bolt is unscrewed and screwed to the other party, and the locking nut is used to prevent loosening. In these cases, the rebar itself is not rotated, but the present invention provides a strong crimping force and does not diminish the advantages of the present invention that enable the use of low-quality bolts. .

Further, the present invention is applied to a case where the reinforcing bars are butt-connected with each other via connecting bolts.
As another means, it is also possible to connect without using this connection bolt. For example, at the factory, a sleeve member is fixed to the tip of one reinforcing bar in advance, and the tip of the other reinforcing bar is inserted and crimped at the construction site from the other hole of the sleeve, thereby forming a tip of each reinforcing bar. It is also possible to connect the parts by directly abutting each other. Strong coupling force is obtained by crimping crushed corners of the polygon, and engraved in the connecting bolt及Bime threaded portion can save construction costs because the sleeve may also be one on which unnecessary It has the following features .

[0018]

According to the present invention, a sleeve member having a polygonal outer periphery and a circular inner periphery is used, the distal end of a deformed reinforcing bar is inserted from one end, and the inserted portion is compressed and deformed toward the center. In this way, the sleeve is crimped to the reinforcing bar, so that the crimping strength is increased and a large bonding force is obtained. Also,
Since the inner diameter of the hole for inserting the reinforcing bar of the sleeve member and the inner diameter of the internal thread are the same, the diameter of the connection bolt to be screwed with this internal thread becomes large, and it can withstand a tensile load equal to or greater than that of the deformed reinforcing bar.
Also it has become of that. As a result, it is not necessary to use a high-grade material such as chromium-molybdenum steel as in the prior art as a bolt material, which contributes to a reduction in construction cost. In addition,
Since the side of the polygonal side of the sleeve is suitable for directly applying a wrench or the like, the workability at the site can be improved.

[Brief description of the drawings]

FIG. 1 is a partially cutaway sectional view showing a main part of the present invention.

FIG. 2 is a cross-sectional view showing a state in which a sleeve is fixed to the tip of a deformed reinforcing bar.

FIG. 3 is a sectional view showing a sleeve member.

FIG. 4 is a perspective view showing a procedure for fixing a sleeve member to a reinforcing bar.

FIG. 5 is a front view of a connection bolt.

FIG. 6 is a partially cutaway sectional view showing a conventional technique.

[Description of Signs] 1, 2 Reinforcing bar 3, 4 Sleeve 3a, 4a Female thread 5 Connection bolt 13 Sleeve 13a Female thread 13c Corner

[Procedure amendment 2]

[Document name to be amended] Drawing

[Correction target item name] Fig. 4

[Correction method] Change

[Correction contents]

FIG. 4

Claims (1)

[Claims] 1. A connecting sleeve is fixed to each end of a deformed reinforcing bar to be butt-connected, and is provided within a predetermined length range from the end of each of the sleeves. The sleeve has a polygonal outer periphery and a circular inner periphery, and is cut into a predetermined length from the end of the sleeve to a predetermined length range. A thread portion is provided as a sleeve member, and a tip portion of the deformed reinforcing bar is inserted into a range where the female thread portion of the sleeve member is not provided, and the polygonal corner portion in a range where the deformed reinforcing bar is inserted. A joint structure for a deformed reinforcing bar, which is crimped to the outer periphery of the deformed reinforcing bar in a state having a strength of crimping by compressively deforming the deformed reinforcing bar in a radial direction.