TWI521126B - Shaped steel bar welded joints, as well as with the thread of shaped steel - Google Patents

Description

Threaded steel joints with special-shaped steel bars and profiled steel bars with threads

The present application claims the priority of Japanese Patent Application No. 2012-095213, filed on Apr. 19, 2012, which is incorporated herein by reference in its entirety.

The present invention relates to a screw-type reinforcing bar joint of a deformed steel bar used for reinforced concrete, and a profiled reinforcing bar provided with a thread.

Steel bars for reinforced concrete are generally made of profiled bars. In the long columns, beams, continuous footings, etc., in order to make the steel bars of a limited length into continuous steel bars at the site, various steel joints are used. As a steel joint, it generally includes: a laminated joint that overlaps steel bars with a predetermined length, and a gas crimp joint. However, the lap joints become cumbersome due to the overlap, and the presence of joints in the gas crimp joints depends on the shortcomings of the crimping technique.

Therefore, as a special joint, a joint in which a cement slurry and a steel bar are poured together in a sleeve has been developed. The special joint for pouring cement slurry is ideal based on the simplification of the reinforcement structure, and has been put into practical use, but cement. The hardening of the slurry, for example, must be in the health period of about one day, and there is a disadvantage that the construction period is prolonged.

As a special joint that can shorten the construction period, a screw-type joint has been proposed (Patent Document 1). Patent Document 1 discloses that in order to secure the connection strength, a diameter-enhancing portion is provided at the end portion of the reinforcing bar to perform a threading process, or a non-integral-diameter screw shaft is joined to the end portion of the reinforcing bar by friction welding.

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2002-227342

The screw-type steel joint has the advantage of being able to be applied in a short period of time as described above, but in order to secure the joint strength, it is necessary to perform the diameter expansion treatment of the male thread portion of the end portion. The method of expanding the diameter includes a method of joining the non-integral-diameter screw shaft to the end portion of the reinforcing bar by friction welding, and heating the reinforcing bar to give a compressive force to expand the diameter. However, in the above-described treatment of friction welding and heat compression, in order to ensure accuracy and reliability, it is necessary to use a large-scale apparatus, and it is difficult to ensure productivity.

An object of the present invention is to provide a screw-type reinforcing bar joint of a deformed steel bar, which is easy to form a male thread portion of a reinforcing bar end portion, has excellent productivity, and has excellent strength of a male thread portion; and is used for a screw-type reinforcing bar joint of the deformed steel bar. The threaded profiled steel bar is simple to manufacture and has improved productivity.

(Request 1)

The screw-type reinforcing steel joint of the special-shaped steel bar of the present invention is a steel joint for connecting a pair of steel bars, and has a male thread portion at an opposite end portion of the steel bar which should be connected to each other, and is provided with a male steel bar a screw barrel in which the threaded portion is screwed; at least one of the reinforcing bars of the pair of reinforcing bars is a deformed reinforcing bar having a protrusion on an outer peripheral surface of the reinforcing bar body;

The reinforcing bar belonging to at least one of the deformed reinforcing bars is a wire made of iron as a material, and the ridge of the outer peripheral surface is formed by roll forming, and the diameter of the portion in the longitudinal direction is expanded more than other portions. The formed portion is formed by setting the outer diameter of the enlarged diameter portion to be equal to or smaller than the outermost diameter of the reinforcing bar of the reinforcing bar, and the male screw portion is formed by rolling in the enlarged diameter portion.

According to the screw-type reinforcing bar joint of this structure, the end portion of the reinforcing bar is formed as a diameter-expanding portion, and the male screw portion is formed by screwing, and the diameter of the male screw portion is thicker than when the thread processing is directly performed at the end portion. It can ensure the strength of the joint. In the male thread portion, the diameter-enlarged portion of the steel bar is processed, and the diameter-enlarged portion is set to include the outer diameter of the steel bar including the protruding strip of the deformed steel bar, that is, the outer diameter of the steel bar. It is manufactured by the method of reinforcing steel in the radial part. That is, when the profiled steel bar is subjected to roll forming, the steel bar which is moved in the longitudinal direction by the heat state of red heat is guided by the contact of the outer peripheral surface with the guide member, and if there is an expansion of the outer diameter above the protrusion In the diameter-forming portion, the diameter-enlarged portion is brought into contact with the guide member to be lifted, and the reinforcing bar is bent. The bending remains after the steel bar is cooled to a certain extent. It is a deformed steel bar with a curved shape. Therefore, such a thickened diameter-enlarged portion cannot be manufactured at the time of manufacturing the steel bar, and it is necessary to perform processing by heating and compression as described above after the completion of the production of the steel bar. However, if the diameter-enlarged portion is set to include the outer diameter of the reinforcing bar of the ridge, that is, the outer diameter of the reinforcing bar, the steel bar is not bent in contact with the guide during the manufacture of the reinforcing bar, and the reinforcing bar can be expanded at the time of manufacture of the deformed reinforcing bar. The manufacturing of the steel bars. Therefore, in addition to the reinforcing steel manufacturing equipment, it is not necessary to provide an expansion processing apparatus, and it is possible to simplify the apparatus and to have excellent productivity.

In addition, since the male thread portion of the steel bar is a rolled thread, unlike the case where the thread groove is cut, the material is not removed, and the sectional area is offset by the thread groove and the thread ridge, and the outer diameter of the steel bar is expanded in the enlarged diameter portion. In the following limited range, the reinforcing effect of the expansion can be maximized.

Further, the reinforcing bar of one of the reinforcing bars that are connected to each other is not necessarily the reinforcing bar having the male screw portion formed in the enlarged diameter portion, and may be any reinforcing bar having a male thread. For example, when the steel bars of different diameters are connected to each other, the steel bars on the large diameter side may be steel bars in which the end portions are subjected to the true round processing, and the male thread portions are formed in the true round processed portion. In addition, when one of the reinforcing bars is a short reinforcing bar or the like used for a corner portion of a reinforced concrete, the both ends of the thicker reinforcing bar can be thread-cut and used as a reinforcing bar.

(Requests 2, 3)

In the present invention, the reinforcing bar belonging to at least one of the deformed reinforcing bars may be a portion that is connected to the base end of the male screw portion as a threading portion for avoiding separation; The escape threading portion is a spiral escape groove formed by rolling on the outer peripheral surface of the protruding portion, and the spiral escape groove is fitted to the threaded ridge of the female screw portion of the screw barrel. The length of the threading portion for avoidance is preferably equal to or longer than the length of the threaded portion minus the length of the male screw portion. Further, the spiral escape groove does not necessarily have to have a shape that contributes to the screwing, and may have a cross-sectional shape in which the thread ridge of the barrel can be avoided, and may have a cross-sectional shape in which a gap is formed in the meshing portion.

The portion of the deformed reinforcing bar that constitutes the thread-removing portion is preferably larger than the general portion of the deformed reinforcing bar.

In this way, if the threading portion for the escape is provided, the problem of interference with the protrusion of the deformed steel bar does not occur when the screw is used for the connection work, and the entire screw can be screwed inward to the side of the reinforcing bar. At the end of the reinforcing bar, the other side of the reinforcing bar is opposed to the other, and the screw is turned over, so that the reinforcing bars on both sides can be screwed. According to such a connection method, when the screw barrel is rotated and joined, the steel bar does not have to be moved in a large amount without being screwed in.

In other words, in the case where the diameter of the protrusion including the irregular steel bar, that is, the diameter-expanded portion of the outer diameter of the reinforcing bar is equal to or less than the outer diameter of the reinforcing bar, the male screw portion is formed, and even if the screw that is screwed into the screw is to be screwed into the male screw portion. On the side, since the inner diameter of the female thread portion of the barrel is below the outer diameter of the reinforcing bar, the thread ridge of the barrel interferes with the protrusion of the deformed steel bar, and cannot be screwed into the inner side of the male thread portion. This interference can be avoided by using the aforementioned threading portion for avoidance.

In addition, among the protrusions of the profiled steel bar, the protrusions extending along the length direction, that is, the ribs, contribute to the sectional area of the steel bar, when by cutting When the spiral escaping groove is formed in the rib portion, the cross-sectional loss occurs, and when the tensile force is applied, the strength may be insufficient in the portion. However, when the spiral escape groove is formed by rolling, the amount of the cross-sectional loss of the reinforcing bar material generated by the threading process in the rib portion is different from the rib portion in the same length direction. The plastic flow in the circumferential direction portion keeps the cross-sectional area of the entire steel bar constant regardless of the processing of the spiral escape groove. Therefore, it is possible to avoid the problem that the strength is lowered due to the formation of the spiral escape groove.

However, if the part is finally broken, it is not ideal. The outer diameter of the reinforcing bar body is preferably larger than the general part of the deformed steel bar in the portion of the deformed reinforcing bar which is formed as the threading portion for the above-mentioned avoidance. For example, the valley portion can be made shallow to compensate for the sectional area corresponding to the sectional area of the rib.

Further, by lengthening the length of the male thread portion, the screw can be screwed into a position that does not protrude from the end surface of the reinforcing bar, but in this case, the length of the male thread portion is longer than that of the deformed steel bar. The cross-sectional shape of which has reduced adhesion to concrete. In the part where the steel bar is not used as a joint, it is necessary to ensure the maximum function of the profiled steel bar, that is, the adhesion property of the concrete.

In this regard, if the ridges on the outer peripheral surface of the reinforcing bar are formed into a spiral escape groove by rolling, the two functions of the connection workability of the joint and the concrete adhesion function can be simultaneously obtained.

(Request 4)

The threaded profiled steel bar of the present invention is the aforementioned by the present invention a screw-shaped reinforcing bar joint for connecting the deformed reinforcing bar; a protruding bar on the outer peripheral surface of the reinforcing bar body, and a male thread portion at the end; and further, the outer peripheral surface of the wire made of iron as a material by roll forming The ridge is formed, and a diameter-enlarged portion is formed in a part of the longitudinal direction to be expanded in diameter, and the outer diameter of the enlarged diameter portion is set to be equal to or smaller than the outer diameter of the reinforcing bar including the ridge of the reinforcing bar. The male screw portion is formed by rolling in the diameter-enlarged portion.

According to this configuration, the screw-type reinforcing bar joint of the above-described profiled steel bar according to the present invention can be made to have a diameter-expanding portion in the manufacture of the profiled steel bar because the diameter-increased portion is equal to or smaller than the outermost diameter of the reinforcing bar including the protruding bar. Made of steel. Therefore, in addition to the reinforcing steel manufacturing equipment, it is not necessary to provide an expansion processing apparatus, and it is possible to simplify the apparatus and to have excellent productivity. Moreover, since it is a rolling thread, unlike the case where the thread groove is cut, the material is not removed, and the sectional area is offset by the thread groove and the thread ridge, and the diameter expansion portion is within the limited range of the outer diameter of the steel bar. The reinforcing effect of the expansion is maximized.

(Request 5)

In the profiled steel bar provided with the thread according to the present invention, the threaded special-shaped reinforcing bar may be a portion that is connected to the base end of the male screw portion as a thread-avoiding portion; the threading portion for avoiding is in the foregoing The protruding portion of the outer peripheral surface is formed by a spiral escape groove formed by rolling, and the spiral escape groove is fitted to a thread ridge of a female screw portion of the screw that is screwed to the male screw portion.

In the case of adopting this configuration, the above-mentioned saying about the screw-type reinforcing bar joint Similarly, the screw can be screwed into the inner side of the male threaded portion and then reversed to perform the joining operation, thereby improving the connection workability and ensuring the concrete attachment function of the deformed steel bar.

(Request 6)

In the profiled reinforcing bar provided with the thread according to the present invention, a diameter-enlarged portion in which the male screw portion is not formed may be provided in the middle of the longitudinal direction of the reinforcing bar, and the diameter of the enlarged diameter portion for forming the male screw portion is the same.

When the steel bar having the state in which the male screw portion is not processed is subjected to roll forming, the diameter-enhancing portion is formed in accordance with the outer circumferential length of the roller. Therefore, the profiled steel bar which is longer than the outer circumferential length of the roller has an enlarged diameter portion in the middle of the longitudinal direction of the steel bar, and the enlarged diameter portion in the middle of the steel bar can maintain the state of the unprocessed male screw portion while in the reinforcing bar Buried into concrete when in use.

(Request 7)

The diameter-enlarged portion in which the male screw portion is not formed in the middle of the longitudinal direction of the reinforcing bar may be the same as the length of the male screw portion. When the length of the enlarged diameter portion where the male screw portion is not formed and the length of the male screw portion are the same length, the steel bar after the roll forming is cut, but the steel bar of the scrap material is generated, but the male thread portion is not formed in the middle. The length of the enlarged diameter portion is short, and the anchoring property of the enlarged diameter portion can be suppressed from being lowered, and the anchoring property to concrete is excellent.

(Request 8)

The diameter-enlarged portion in which the male screw portion is not formed in the middle of the longitudinal direction of the reinforcing bar may have a length which is about twice the length of the male screw portion. It is preferable to provide a circumferential groove in the center in the longitudinal direction of the intermediate diameter expansion portion.

The length of the enlarged diameter portion in the middle in the longitudinal direction is set to be about twice the length of the male screw portion. Specifically, the length of the male screw portion is twice the length of the cut amount, and the length is divided in the diameter-expanding portion. In the case of two halves, the male thread portion is formed by rolling, and the male thread portion of the end portion of the reinforcing bar can be formed. Therefore, at the time of roll forming, the length of the unrestricted steel bar can be roll-formed, and then a plurality of steel bars are cut according to the length of the steel bar of the product, and are cut from the center of the expanded diameter portion, and are cut off from the center. The expanded diameter portion is rolled to the male thread portion, and the steel rod of a desired length can be efficiently produced.

The enlarged diameter portion remaining in the middle of the longitudinal direction of the reinforcing bar may be embedded in the concrete as described above, and since it is a simple round bar shape, the adhesion to the concrete is lowered as compared with the deformed portion. However, if the circumferential groove is provided in the center of the diameter-enlarged portion as described above, the adhesion can be increased as in the case where one node is provided. In addition, in the case where the circumferential groove of the center of the diameter-enlarged portion is to be cut to form the male screw portion, it is a symbol for cutting, which contributes to the improvement of the workability.

(Request 9)

In the profiled steel bar provided with the thread of the present invention, the aforementioned profiled steel bar provided with the thread may have the male thread portion at both ends and the male thread portion at one end. The screwing barrel is connected with other threaded shaped reinforcing bars; the male threaded portion at the other end is screwed with the anchoring plate by a female threaded portion formed on the inner circumference of the anchoring plate, and the anchoring plate is constructed to be anchored to Rebar head inside concrete.

In general, the ends of the reinforced concrete beams and the main reinforcing bars of the continuous footings are bent in the up and down direction to form a bent portion in order to securely anchor the concrete. However, the bent portion causes an increase in the amount of reinforcing steel used and a complication of the reinforcing reinforcement. In order to solve this problem, there is a method of obtaining the anchoring strength in place of the bent portion, which is to use a reinforcing bar having an enlarged diameter head at the end. This method is called T-head steel method, or mechanical steel anchoring method. The above-mentioned expanded diameter head is processed by high-frequency induction heating and pressure molding, which requires a large-scale production equipment. On the other hand, in the above-described manner, the anchoring plate is screwed in the male screw portion provided at one end of the reinforcing bar, and the enlarged diameter head for concrete anchoring can be easily formed by the male screw portion for connection by the screw barrel.

(Request 10)

One of the manufacturing methods of the threaded profiled steel bar of the present invention having a protruding portion on the outer peripheral surface of the reinforcing bar body and a male threaded portion at the end portion is a wire made of iron as a material by roll forming. The ridge of the outer peripheral surface is molded, and a diameter-enlarged portion which is expanded in diameter in a part of the longitudinal direction is formed, and the outer diameter of the enlarged diameter portion is set to be the most reinforcing steel including the ridge of the reinforcing bar. Below the outer diameter, the diameter-enlarged portion is cut at the end portion, and the male screw portion is rolled in the enlarged diameter portion of the cut-shaped deformed steel bar.

In the case of the method, it can be used in the manufacture of profiled steel bars. It is manufactured by means of a steel bar having an enlarged diameter portion. Therefore, in addition to the reinforcing steel manufacturing equipment, it is not necessary to provide an expansion processing apparatus, and it is possible to simplify the apparatus and to have excellent productivity. Since the diameter-increased portion is equal to or smaller than the outermost diameter of the steel bar including the ridges, it can be manufactured as a steel bar having a diameter-enlarged portion at the time of manufacture of the deformed steel bar. Moreover, since the male thread is rolled, unlike the case where the thread groove is cut, the material is not removed, and the sectional area is offset by the thread groove and the thread ridge, and the diameter expansion portion is within the limited range of the outer diameter of the steel bar. , the reinforcing effect of the expansion can be maximized. In the case of the present method, when a plurality of profiled steel bars having threads formed by the above-mentioned male screw portions are formed from the material-reinforcing bar after the roll forming, the steel bars of the scraps are generated, but the manufactured steel bars are produced. Since the length of the enlarged diameter portion in which the male thread portion is not formed is short, the anchoring property of the enlarged diameter portion can be suppressed from being lowered, and the anchoring property to the concrete is excellent.

(Request 11)

In the method of the present invention, the roll for roll forming can be rotated a plurality of times, and the material steel having the enlarged diameter portion in the middle portion in the longitudinal direction can be roll-formed, and the length of the expanded portion at an arbitrary portion can be performed. The material-shaped reinforcing bar is cut at the end portion in the direction, and the male screw portion is rolled at the enlarged diameter portion of the cutting portion. In the case of the present manufacturing method, the reinforcing bars of the scraps are generated as described above, but the deformed reinforcing bars having the threads of various lengths can be efficiently produced.

(Request item 12)

Another manufacturing method of the threaded special-shaped reinforcing steel of the present invention having a protruding portion on the outer peripheral surface of the reinforcing bar body and a male thread portion at the end portion is a wire made of iron as a material by roll forming The ridges of the outer peripheral surface are formed, and a diameter-enlarged portion having a larger diameter than the other portions is formed in a part of the longitudinal direction, and the outer diameter of the enlarged diameter portion is set to be the outermost steel bar including the ridge of the reinforcing bar. Below the diameter, the diameter-enlarged portion is cut in the middle, and the male-threaded portion is rolled in the enlarged diameter portion of each of the cut-shaped reinforcing bars.

In the case of the present method, it is also possible to manufacture the steel bar having the enlarged diameter portion at the time of manufacture of the deformed steel bar. Therefore, in addition to the reinforcing steel manufacturing equipment, it is not necessary to provide an expansion processing apparatus, and it is possible to simplify the apparatus and to have excellent productivity. Since the diameter-increased portion is equal to or smaller than the outermost diameter of the steel bar including the ridges, it can be manufactured as a steel bar having a diameter-enlarged portion at the time of manufacture of the deformed steel bar. Moreover, since the male thread is rolled, unlike the case where the thread groove is cut, the material is not removed, and the sectional area is offset by the thread groove and the thread ridge, and the diameter expansion portion is within the limited range of the outer diameter of the steel bar. , the reinforcing effect of the expansion can be maximized. In the case of the present manufacturing method, since the diameter-expanding portion is cut from the center, the male-threaded portion is rolled in the enlarged diameter portion of each of the cut-shaped reinforcing bars after the cutting, so that the material reinforcing bar after the roll forming can The cutting is performed so that the scrap is not generated, and a plurality of profiled reinforcing bars having the plurality of the male screw portions formed at both ends are obtained.

(Request 13)

In the present manufacturing method, the roller for roll forming can be rotated a plurality of times, and the plurality of portions in the middle in the longitudinal direction can have the enlarged diameter portion. The material reinforcing bar is subjected to roll forming, and the material-shaped reinforcing bar is cut at the center portion in the longitudinal direction of the enlarged diameter portion of the arbitrary portion, and the male screw portion is rolled at the enlarged diameter portion of the cut portion. According to the manufacturing method, the profiled steel bars of various lengths can be efficiently produced.

Any combination of at least two configurations disclosed in the scope of the claims and/or the description and/or drawings is also included in the present invention. In particular, any combination of two or more of the claims of the patent application scope is also included in the present invention.

1,1A, 1B‧‧‧ steel bars

1a‧‧‧Steel body

1b‧‧‧

1ba‧‧‧ ribs

1bb‧‧

1c‧‧‧ Male thread

1e‧‧‧Dropping thread

1ea‧‧‧Spiral avoidance slot

1f‧‧‧General section

1g‧‧‧Without threaded unformed parts

1s‧‧‧ scraps

2‧‧‧Rouge

3‧‧‧ anchoring board

6‧‧‧Circular groove

11‧‧‧Forming rollers

12‧‧‧ Guides

13‧‧‧Rolling rolls

A, B, C‧‧‧ screw-type steel joints

D1‧‧‧ steel outer diameter

D2‧‧‧ outer diameter of the steel body

Length of the L1‧‧‧ male thread

L2‧‧‧ barrel full length

W0‧‧‧Wire

W1‧‧‧long shaped steel bars as materials

W1d, W1d ' ‧‧‧Expansion Department

The invention will be more clearly understood from the following description of the preferred embodiments. However, the embodiments and the drawings are intended to be illustrative and not to limit the scope of the invention. The scope of the invention is defined by the scope of the patent application. In the figures, the same element symbols in the various figures represent the same or equivalent parts.

Fig. 1A is a cross-sectional view showing a screw-type reinforcing bar joint of a deformed reinforcing bar according to a first embodiment of the present invention.

Figure 1B is a cross-sectional view showing the joining process of Figure 1A.

Figure 1C is a cross-sectional view of the profiled bar of Figure 1A.

Fig. 2 is an exploded cross-sectional view showing the screw-type reinforcing bar joint of the deformed steel bar.

Fig. 3 is a cross-sectional view showing a screw-type reinforcing bar joint of a deformed reinforcing bar according to a second embodiment of the present invention.

Fig. 4 is a cross-sectional view showing a screw-type reinforcing bar joint of a deformed reinforcing bar according to a third embodiment of the present invention.

Fig. 5 is a cross-sectional view showing a male thread portion of a male thread portion of the deformed steel bar.

Figure 6 is a perspective, partially omitted perspective view of the reinforcing bar.

7(A) to 7(C) are explanatory views showing the steps of a manufacturing process of the deformed reinforcing bar used in the screw-type reinforcing bar joint of the deformed reinforcing bar according to the first embodiment.

Fig. 8 is an explanatory view of a roll forming process of the manufacturing process.

Fig. 9 is an explanatory view showing a rolling step of the thread groove of the manufacturing process.

Fig. 10 is a cross-sectional view showing a screw-type reinforcing bar joint of a deformed reinforcing bar according to a fourth embodiment of the present invention.

Fig. 11 is a cross-sectional view showing a screw-type reinforcing bar joint of a deformed reinforcing bar according to a fifth embodiment of the present invention.

Figure 12 is a partial side elevational view of the profiled bar used in the threaded rebar joint.

Fig. 13A is a cross-sectional view taken along line XIII A of Fig. 12;

Fig. 13B is a cross-sectional view taken along line XIII of Fig. 12;

Figure 13C is a cross-sectional view taken along line XIII C of Figure 12 .

Figure 14 is a side elevational view of the profiled bar.

15(A) to 15(C) are explanatory views showing a manufacturing process of a steel bar according to a sixth embodiment of the present invention.

Figure 16 is a side elevational view of the reinforcing bar.

17(A) to (C) are explanatory views showing a manufacturing process of a steel bar according to a seventh embodiment of the present invention.

Figure 18 is a side elevational view of the reinforcing bar.

Fig. 19 is a side view showing a part of a reinforcing bar according to an eighth embodiment of the present invention.

Fig. 20 is a cross-sectional view showing a screw-type reinforcing bar joint of a deformed reinforcing bar according to a ninth embodiment of the present invention.

Fig. 21 is a perspective side view showing a screw-type reinforcing bar joint and a reinforcing bar of a deformed reinforcing bar according to a tenth embodiment of the present invention.

The first embodiment of the present invention will be described with reference to Figs. 1A, 1B, 1C and Fig. 2 . The screw-type reinforcing bar joint of the profiled steel bar is a steel bar joint connecting a pair of steel bars 1, 1 by a screw barrel 2. The reinforcing bar 1 is a deformed reinforcing bar having a rib 1ba extending in the longitudinal direction and a rib 1b extending in the circumferential direction on the outer peripheral surface of the reinforcing bar body 1a. Section 1bb is provided at a certain interval separated by a length direction. The rib 1ba extending in the longitudinal direction is provided at two locations separated in the circumferential direction in the illustrated example, but may be provided in three to four locations separated in the circumferential direction. Although the knot 1bb is formed in a circular shape throughout the entire circumference, the knot 1bb can be made semicircular, and the semicircular portion located on the outer circumference of the reinforcing bar and the semicircular portion of the remaining half-circumferential portion are alternately disposed along the length direction.

The opposite ends of the reinforcing bars 1, 1 which are connected to each other are formed to have an outer diameter of the reinforcing bar including the above-mentioned ridge 1b, that is, an outer diameter D1 of the reinforcing bar or less and an outer diameter D2 or more of the reinforcing steel body. In the portion W1d (Fig. 7), the diameter-enlarged portion W1d is threaded to form the male screw portion 1c. The male screw portion 1c is a rolled thread.

The ridge 1b of the reinforcing bar 1 and the enlarged diameter portion W1d for molding the male screw portion 1c are manufactured by roll forming at the time of manufacture of the reinforcing bar 1 as will be described later.

In the case of the dimension, when the outer diameter D2 of the reinforcing bar 1 is 15.2 mm and the outermost diameter D1 of the reinforcing bar is 17.6 mm (the height of the rib 1ba and the height of the section 1bb is 1.2 mm), the diameter of the male thread portion 1c is expanded. The outer diameter of the portion W1d is 16.3 mm.

In addition, the outer diameter of the male screw portion 1c of the reinforcing bar 1 is equal to or smaller than the outermost diameter D1 of the reinforcing bar and the outer diameter D2 of the reinforcing bar body. However, in the case of rolling the thread, it is not necessarily the outermost state of the reinforcing bar in the completed state. Below the diameter D1, the state of the expanded diameter portion W1d before rolling may be equal to or less than the outermost diameter D1 of the reinforcing bar. In the case of rolling the thread, the outer diameter of the threaded ridge after rolling may be larger than the outer diameter of the material, and the outer diameter of the enlarged diameter portion W1d is limited, which is based on the roll forming before the male thread portion 1c is rolled. The reason for the convenience in the process. The groove bottom diameter of the male screw portion 1c of the reinforcing bar 1 is set to be equal to or larger than the outer diameter D2 of the reinforcing bar body of the reinforcing bar 1.

In the present embodiment, the male screw portion 1c of the two reinforcing bars 1 is set to have the same diameter, the same pitch, and the spiral direction in the same direction, and the length L1 of the male screw portion 1c of each reinforcing bar 1 is equal to the length L2 of the barrel plus The amount of clearance between the end faces of the two reinforcing bars 1, 1. Further, the male thread portions 1c, 1c of the two reinforcing bars 1 may have different diameters, pitches, and spiral directions. For example, the male thread portions 1c, 1c of the two reinforcing bars 1 may be reversed in the opposite direction.

A portion where the base ends of the male screw portions 1c of the reinforcing bars 1 are connected to each other is formed as a thread-removing portion 1e. The threading portion 1e for avoidance is in the reinforcing bar 1 The rib 1ba of the outer peripheral surface and the rib 1b of the node 1bb and the like are formed by rolling to form a portion of the spiral escape groove 1ea that is fitted to the thread ridge of the female screw portion 2a of the barrel 2. The length L3 of the thread-removing portion 1e is such that the length L2 of the barrel 2 is smaller than the length L1 of the male screw portion 1c or a length slightly longer than this.

The cross-sectional shape of the spiral escape groove 1ea is the same as the thread groove of the male screw portion 1c in this example, but it does not need to be a shape that contributes to screwing. As long as the cross-sectional shape of the thread ridge of the barrel 2 can be avoided, a cross-sectional shape in which a large gap is formed in the meshing portion between the thread ridges may be used.

The groove bottom diameter of the spiral escape groove 1ea of the threaded portion 1e is set to be equal to or larger than the outer diameter D2 of the reinforcing bar main body 1a. However, the outer diameter D2 of the reinforcing steel main body 1a may not be obtained based on a machining error or the like. Since the spiral escape groove 1ea is rolled, the cross-sectional dimension of the steel bar 1 does not change regardless of the groove bottom diameter.

As shown in FIG. 3, the thread-removing portion 1e can be provided only on one of the reinforcing bars 1, 1 on both sides of the screw 2, and on both sides as shown in FIG. The reinforcing bars 1, 1 may be provided with the threading portion 1e for avoiding.

The barrel 2 is a cylindrical body made of steel in which the female screw portion 2a is continuously formed over the entire circumference. Further, it may be formed as a reverse thread as described above. The cross-sectional shape of the female screw portion 2a of the barrel 2 and the male screw portion 1c of the reinforcing bar 1 may be triangular, trapezoidal, rectangular, or curved.

Each of the reinforcing bars 1 is formed with the aforementioned male thread portion at both ends 1c and 1c may be formed into a plurality of sizes, for example, and the male screw portion 1c may be formed only at one end.

As shown in Fig. 5 and Fig. 6, the male screw portion 1c of the reinforcing bar 1 can be used for the formation of the expanded-diameter steel head 1T for concrete anchoring. That is, the anchoring plate 3 can be screwed by the female screw portion 3a formed on the inner circumference of the anchoring plate 3. The expanded-diameter reinforcing steel head 1T is composed of an anchoring plate 3 and a fixing plate 4 as shown in the drawing; the fixing plate 4 is overlapped with the anchoring plate 3 and screwed to the male screw portion 1c of the reinforcing bar 1 Lock the nut. Further, the fixing plate 4 does not have to be provided.

At the male screw portion 1c at the other end of the reinforcing bar 1, the aforementioned barrel 2 of the reinforcing bar joint is screwed. Further, the male screw portion 1c at both ends of the reinforcing bar 1 may be formed by using the anchoring plate 3 and the expanded diameter head 1T of the fixing plate 4.

Next, a method of manufacturing the reinforcing bar 1 having the male screw portion 1c will be described. As shown in Fig. 7, in the manufacture of the long-shaped deformed steel bar W1 as a material, the outer diameter D4 of the length range L0 of a part of the reinforcing bar body 1a in the plurality of portions in the longitudinal direction is made to include the protrusion 1b. The diameter, that is, the diameter-expanded portion W1d which is larger than the outermost diameter D1 of the reinforcing bar and larger than the outer diameter D2 of the reinforcing bar main body 1a of the other portion. The length range L0 of the diameter-enlarged portion W1d is twice the length L1 of the male screw portion 1c plus the amount of cutting for subsequent cutting.

As shown in Fig. 8, the material-shaped reinforcing steel W1 is a round bar-shaped wire W0 made of iron as a material, and is rolled by roll forming by passing through the forming rolls 11 and 11. 1b molding. In this molding, the wire W0 is heated and thermoformed. Using molding rolls In the roll forming process of 11, 11, the diameter-enlarged portion W1d is provided. Specifically, the molding rolls 11 and 11 are provided with recesses (not shown) for forming the protrusions 1b of the reinforcing bars 1 on the outer peripheral surface of the molding die surface, and the outer peripheral faces of the molding rolls 11, 11 are formed. A part of the circumferential direction is formed as a recessed portion 11a for expanding the diameter forming portion. The circumferential length of the enlarged diameter portion forming concave portion 11a is set to the length (L0) of the diameter-enlarged portion W1d to be molded. By using the molding rolls 11 and 11, a part of the longitudinal direction of the material-shaped reinforcing steel W1 that has passed through the molding is made into the diameter-enlarged portion W1d, and the ridge 1b is molded in the remaining length range.

When the diameter-increased portion W1d is equal to or smaller than the outermost diameter D1 of the reinforcing bar, when the long-shaped deformed reinforcing bar W1 as the material is produced by roll forming, the diameter-enlarged portion W1d does not come into contact with the guide 12 such as a roller. The guide member 12 is a material-shaped reinforcing bar W1 for contacting the protrusion 1b of the material-shaped reinforcing bar W1 to guide the heated state. Therefore, when the profiled reinforcing bar W1 is manufactured, the contact between the expanded diameter portion W1d and the guide member 12 does not occur. The problem of the deformed steel W1 bending.

The profiled steel bar W1 as the material is cut in the middle of each of the diameter-enlarged portions W1d to obtain a plurality of profiled reinforcing bars W1 having a diameter-enlarged portion having a predetermined length of the diameter-enlarged portion W1d at both ends. ' . The profiled steel bar W1 ' having the enlarged diameter portion of the predetermined length, for example, when applied to a foundation of a building such as a house, can be set as a multiple of a mold (for example, 910 mm, 1000 mm, etc.) of a mold design. , or a multiple of 1/2 of the aforementioned mode moment.

After the cutting, the enlarged diameter portion W1d of the deformed reinforcing bar W1 ' having the enlarged diameter portion is rolled between the pair of rolling rollers 13 and 13 as shown in Fig. 9, and the male screw portion 1c is rolled. The processing is a reinforcing bar 1 having a male screw portion 1c having an expanded diameter at both ends. The pair of rolling rollers 13, 13 are disposed apart from each other as shown in the drawing, and the diameter-enhancing portions W1d are positioned between the rollers 13 and 13 for rolling, and the two rollers 13 and 13 are turned by arrows. The diameter-enlarged portion W1d is pressed while moving in the radial direction and rotating. At the time of the rolling process, after the male screw portion 1c is rolled, the deformed steel bars W1 ' provided with the enlarged diameter portion are sandwiched between the rolling rollers 13, 13 and the rolled portion is connected to the male screw portion 1c. The threading portion 1e for avoiding (Fig. 1A).

According to the screw-type reinforcing bar joint of the profiled steel bar according to the present configuration, the end portion of the reinforcing bar 1 is formed as the diameter-enlarged portion W1d, and the male thread portion 1c is formed by threading, which is a case where the thread processing is directly performed at the end portion. The male thread portion 1c has a relatively large diameter to ensure the strength of the joint portion. The male screw portion 1c is processed in the expanded diameter portion W1d of the reinforcing bar. However, the diameter-enlarged portion W1d is set to include the outer diameter of the reinforcing bar of the protruding strip 1b of the deformed reinforcing bar 1, that is, the outermost diameter D1 of the reinforcing bar. When the steel bar W1 is manufactured, it can be manufactured by the steel bar which has the diameter expansion part. That is, as shown in FIG. 8 and when the material profiled reinforcing bar W1 is subjected to roll forming as described above, the reinforcing bar which is moved in the longitudinal direction in the heat state of red heat is contacted with the guide member 12 by the protrusion 1b of the outer peripheral surface. When the diameter-enlarged portion having the outer diameter of the ridge 1b or more is guided, the diameter-enlarged portion is brought into contact with the guide and pushed up to bend the reinforcing bar. The bend remains a certain degree after the steel bar is cooled, and becomes a deformed steel bar having a curvature. Therefore, such a thickened diameter expansion section cannot be manufactured during the manufacture of steel bars, and must be completed after the manufacture of the steel bars. The processing is performed by heat compression as described above. However, when the diameter-enlarged portion W1d is set to include the outer diameter of the reinforcing bar of the ridge 1b, that is, the outermost diameter D1 of the reinforcing bar, the reinforcing bar is not bent in contact with the guide 12 during the manufacture of the reinforcing bar, and the reinforcing bar W1 is manufactured. It can be manufactured in the form of a steel bar having an enlarged diameter portion. Therefore, in addition to the reinforcing steel manufacturing equipment, it is not necessary to provide an expansion processing apparatus, and it is possible to simplify the apparatus and to have excellent productivity.

Further, since the male screw portion 1c of the reinforcing bar 1 is a rolling thread, unlike the case where the thread groove is cut, the material is not removed, and the sectional area is offset by the thread groove and the thread ridge, and the expanded diameter portion W1d is the outermost steel bar. Within the limited range below the diameter, the reinforcing effect of the diameter expansion can be maximized.

At the time of the joining operation of the screw-type reinforcing bar joint, as shown in FIG. 1B, the screw barrel 2 is screwed to the inner side of the male screw portion 1c of one of the reinforcing bars 1 until it is not protruded from the end surface of the reinforcing bar 1. In this state, the reinforcing bars 1, 1 on both sides are arranged in a substantially butted state. Then, the barrel 2 is inverted to be screwed over the male thread portions 1c, 1c of the reinforcing bars 1, 1 on both sides. Thereby the joint is completed. In this manner, the method of screwing the screw barrel 2 to the male screw portions 1c, 1c of the two reinforcing bars 1, 1 does not require the reinforcing bar to move its screw length as it is screwed in. Therefore, the connection work is easy.

When the screw barrel 2 is screwed and connected, the thread grooves of the pair of reinforcing bars 1, 1 of the male thread portions 1c, 1c must have the same phase to be connected, but the concrete is placed on the continuous base, the beam, and the like. In the case of the reinforcing bars in the front reinforcement state, the axial movement of about 2 to 3 mm can be performed. As long as this degree of movement can be performed, it can be adjusted to make the opposite pair of reinforcing bars The male screw portions 1c and 1c of the 1,1 are connected at positions where the thread grooves are in phase.

Further, the male screw portion 1c is formed in the diameter-enlarged portion W1d which is equal to or smaller than the outermost diameter D1 of the reinforcing bar, and the groove bottom diameter of the thread groove is smaller than the outer diameter D1 of the reinforcing bar. Therefore, as shown in FIG. 1B, when the screw barrel 2 is screwed to the back side of the male screw portion 1c of one of the reinforcing bars to a position that does not protrude from the end surface thereof, the protrusion 2b of the barrel 2 and the deformed reinforcing bar 1 occurs. The problem of interference.

However, in the present embodiment, since the portion of the reinforcing bar 1 that is connected to the male screw portion 1c is formed as the escaping screw portion 1e, the thread ridge of the female screw portion 2a of the barrel 2 does not interfere with the rib 1ba and the node 1bb. The screw barrel 2 can be screwed in deeply.

Although the formation of the thread portion 1e for avoidance causes a cross-sectional loss in the rib portion 1ba or the like, the thread-removing portion 1e is processed by rolling, and the cross-sectional loss does not occur. That is, among the ridges 1b of the deformed reinforcing bar 1, the ribs 1ba extending in the longitudinal direction contribute to the sectional area of the reinforcing bars, and the spiral avoiding grooves are formed in the ribs by cutting or the like. In the case of a section, the corresponding section loss occurs, and the strength may be insufficient in this part when there is a tensile load. However, when the spiral escape groove 1ea is formed by rolling, the amount of the cross-sectional loss of the reinforcing bar material generated by the threading process in the rib 1ba is directed to the rib 1ba at the same length direction. The plastic flow in the different circumferential direction portions keeps the cross-sectional area of the entire steel bar constant regardless of the processing of the spiral escape groove 1ea. Therefore, the shape of the spiral avoidance groove can be avoided The problem of reduced strength occurs.

Further, by lengthening the length of the male screw portion 1c, the screw can be screwed to a position that does not protrude from the end surface of the reinforcing bar. However, in this case, the length of the reinforcing bar portion 1c is longer than that of the reinforcing bar portion. The cross-sectional shape of the profiled steel bar, its adhesion to concrete is reduced. In the part where the steel bar is not used as a joint, it is necessary to ensure the maximum function of the profiled steel bar, that is, the adhesion property of the concrete. In this regard, when the rib 1b of the outer peripheral surface of the reinforcing bar is formed by the rolling to form the spiral escape groove 1ea, the two functions of the connection work of the joint and the concrete attachment function can be simultaneously obtained.

Further, according to the manufacturing method of the above-described threaded deformed steel bar, the deformed reinforcing steel W1 as the material can be manufactured by the reinforcing steel provided with the expanded diameter portion W1d. Therefore, in addition to the reinforcing steel manufacturing equipment, it is not necessary to provide an expansion processing apparatus, and it is possible to simplify the apparatus and to have excellent productivity. Since the diameter-enlarged portion W1d is set to have the outer diameter D1 of the reinforcing bar 1b or less, it can be manufactured as a reinforcing bar having a diameter-increased portion at the time of manufacture of the deformed reinforcing bar W1. Further, since the male screw portion 1c is rolled, unlike the case where the thread groove is cut, the material is not removed, and the sectional area is offset by the thread groove and the thread ridge, and the diameter expansion portion is limited to the outer diameter of the steel bar. Within the scope, the reinforcing effect of the expansion can be maximized.

Further, as described above, the diameter-enlarged portion W1d is formed in the manufacturing process of the deformed steel bar W1, and it is preferable that the outer diameter D2 of the reinforcing bar body is 32 mm or less. When the steel bar having an outer diameter of 32 mm or less is used, the operation of forming the diameter-enlarged portion W1d can be easily performed without deformation or the like in the manufacturing process of the deformed steel bar W1.

The continuous base member or the like of the house is a profiled steel bar 1 using such a small diameter, and therefore the screw-type reinforcing bar joint of the above embodiment can be effectively used. In addition, the steel joints are graded according to the building standard according to the place of use, etc., not the high grades of the SA grade and the A grade, but the steel joints of the lower grade B grade or lower, and do not have to be as high as the SA grade and the A grade. Precision. In the case of a small diameter (small diameter), there are few swaying and the like, and even A grade can be sufficiently ensured. Therefore, in the case where the diameter-enlarged portion W1d formed in the above-described reinforcing steel manufacturing process is subjected to the processing before the forming of the true round, the male screw portion 1c which satisfies the required accuracy can be obtained even if the rolling thread processing is directly performed. The reinforcing bar joint of the steel bar of the continuous base of the house can be used at a level B or less, and the screw-type reinforcing bar joint of the above embodiment can be effectively used.

Further, in each of the above-described embodiments, the male screw portion 1c is rolled on the enlarged diameter portion W1d of the reinforcing bar 1, 1 on both sides to be connected, but one of the reinforcing bars is not necessarily the above-described diameter expanding portion W1d. The reinforcing bar having the male thread portion may be formed as long as it is a reinforcing bar having a male thread.

For example, as shown in FIG. 10, when the reinforcing bars 1 and 1A of different diameters are connected, the reinforcing bar 1A on the large diameter side may be formed by performing round processing on the end portion, and may be formed in the true round processing portion. Rebar of the male thread.

11 to 14 show a fifth embodiment. The screw-type reinforcing bar joint of the deformed steel bar is a portion in which the reinforcing bar 1 of the embodiment of Fig. 1A constitutes the above-mentioned escape threading portion 1e, and the outer diameter of the reinforcing bar body 1a is larger than the general portion 1f of the reinforcing bar 1. Fig. 12 shows the shape of the reinforcing bars before the male screw portion 1c and the spiral escape groove 1ea are rolled. The portion of the material-shaped reinforcing bar W1 where the thread-removing portion 1e is to be formed, that is, the thread for avoiding the separation is not formed. The part is indicated by the symbol "1g".

The outer diameter (radius) R2 ' of the portion constituting the above-mentioned escape thread portion 1e is larger than the outer diameter (radius) R2 of the minimum diameter portion of the reinforcing bar body 1a of the general portion 1f. In other words, in the portion constituting the escape screw portion 1e, the depth H2 of the valley portion between the adjacent nodes 1bb is shallower than the depth H1 of the valley portion of the general portion 1f. The valley portion is shallowed in such a manner as to compensate the sectional area corresponding to the sectional area of the rib 1ba or the sectional area thereof.

Further, as shown in Fig. 14, the reinforcing bar 1 is provided in the middle of the longitudinal direction of the reinforcing bar, and is provided at one or a plurality of portions with the same diameter as the diameter-enlarged portion W1d forming the male screw portion 1c. The diameter expansion unit W1d ' . The intermediate diameter-enlarged portion W1d ' has a length twice the length L1 of the male screw portion 1c, specifically, twice the length L1 of the male screw portion 1c plus the length L0 of the cutting amount. The pitch of the diameter-enlarged portions W1d, W1d ' is, for example, an integral multiple of the mold of the building (for example, 910 mm, 1000 mm, etc.). In addition, the symbols "W1d" and "W1d ' " of the diameter expansion unit are added/not appended with '' in order to distinguish the middle and the end, but "'" may be omitted without special distinction. symbol.

A circumferential groove 6 is provided at the center in the longitudinal direction of each of the intermediate diameter-enlarged portions W1d ' . The cross-sectional shape of the circumferential groove 6 is, for example, a trapezoidal shape. The size of the circumferential groove 6 is 3 mm in the case where the reinforcing bars are 16D, 19D, 22D, for example, the groove width B6.

The reinforcing bar 1 of Fig. 14 is subjected to the aforementioned roll forming as shown in Fig. 8. In the circumferential groove 6, a circumferential groove mold portion (not shown) is provided in the molding roller 11, and is formed at the time of roll forming. In the roll forming, the roll forming roll 11 is rotated a plurality of times, and the material shaped reinforcing bar W1 having the enlarged diameter portion W1d (W1d ' ) at a plurality of portions in the longitudinal direction is subjected to roll forming. The material irregular-shaped reinforcing bar W1 is cut by the circumferential groove 6 of the enlarged diameter portion W1d (W1d ' ) of any portion, and the male-threaded portion 1c is rolled at the enlarged diameter portion W1d of the cut portion.

The other structures of the present embodiment and the structures specifically described below are the same as the above-described embodiments shown in FIGS. 1A, 1B, and 1C.

In the case of the present embodiment, the portion of the reinforcing bar 1 that is configured to avoid the threaded portion 1e is such that the outer diameter of the reinforcing bar body 1a is larger than the general portion 1f of the reinforcing bar 1, that is, R2 as shown in Figs. 13B and 13C. ' >R2, even if an excessive tensile load acts on the reinforcing bar 1, the joint portion (the portion of the male screw portion 1c and the threading portion 1e for avoiding) does not eventually break, and the fracture becomes the normal portion 1f.

Further, as shown in Fig. 14, the reinforcing bar 1 of the present embodiment is provided with an expansion of the male screw portion 1c which is the same as the diameter of the enlarged diameter portion W1d forming the male screw portion 1c in the longitudinal direction of the reinforcing bar. The diameter portion W1d ' has the following advantages.

In other words, when the material-shaped reinforcing steel W1 having the diameter-enlarged portion W1d is roll-formed as shown in FIG. 8, the diameter-enlarged portion W1d is formed in accordance with the outer circumferential length of the forming roller 11. Therefore, the material-shaped reinforcing steel W1 having a length longer than the outer circumferential length of the forming roller 11 has a diameter-enlarged portion W1d in the middle of the longitudinal direction of the reinforcing bar. Therefore, although it is difficult to form in the middle In the case of the material-shaped reinforcing steel W1d having the diameter-enlarged portion W1d, the material-shaped reinforcing steel W1d having the diameter-enlarged portion W1d is easily obtained by roll forming. Even if the diameter-enlarged portion W1d exists in the middle, it can be buried in the concrete when the steel bar is used. At this time, the diameter-enlarged portion W has a simple round bar shape, and its adhesion to concrete is lowered as compared with the profiled portion. However, since the circumferential groove 6 is provided in the center of the diameter-enlarged portion as described above, the adhesion can be increased as in the case where the node is provided at one portion. In addition, when the male groove portion 1c is formed by cutting the circumferential groove 6 at the center of the diameter-enlarged portion W1d, it can serve as a cutting mark and contribute to improvement in cutting workability.

Fig. 15 and Fig. 16 show a profiled reinforcing bar provided with threads according to the sixth and seventh embodiments and a method of manufacturing the same. In the reinforcing bar 1 of the present example, the length of the enlarged diameter portion W1d (W1d ' ) in which the male screw portion is not formed in the middle shown in Fig. 14 is set to be the same length L1 as the length of the male screw portion 1c. The other construction is the same as the reinforcing bar 1 illustrated in Fig. 14.

A method of manufacturing the profiled reinforcing bar 1 provided with a thread of Fig. 16 will be described with reference to Fig. 15. The reinforcing bar 1 is subjected to the above-described roll forming shown in Fig. 8 in the same manner as the reinforcing bar 1 of Fig. 14 . In the roll forming, the roll forming roll 11 is rotated a plurality of times, and the material-shaped reinforcing steel W1 having the enlarged diameter portion W1d having the length L1 in the plurality of portions in the longitudinal direction is subjected to roll forming (Fig. 15). (A). At the end of the diameter-enlarged portion W1d at an arbitrary position, as shown in Fig. 15(B), the material-shaped reinforcing steel W1 is cut, and the enlarged diameter portion W1d of the cut portion is rolled into a male thread. Part 1c (Fig. 15(C)). The remaining steel after the diameter-enlarged portion W1d is cut In the rib, there is no enlarged diameter portion W1d at the end portion, the adjacent diameter-enlarged portion W1d, or a portion until the several diameter-enlarged portions W1d have passed, that is, the scrap reinforcement 1s (indicated by a broken line) It is a steel bar used for different purposes from the screw-type steel joint of the present invention.

Further, when the roll forming is performed as shown in Fig. 8, the enlarged diameter portion forming recessed portion 11a located on the outer peripheral surface of the forming roller 11 can be provided in a plurality of portions in the circumferential direction, and one rotation of the forming roller 11 can be performed. Further, a plurality of diameter-enlarged portions W1d are formed.

The other structure of this embodiment is the same as that of the above-described embodiment shown in Figs. 11 to 14 and the like.

In the case of the present embodiment, the weight of the reduced-diameter portion W1d in which the male screw portion is not formed in the middle is short, and the diameter-enhancing portion W1d is excellent in anchoring property to concrete.

As shown in Fig. 15 and Fig. 16, when the reinforcing bar 1 having the diameter-enlarged portion W1d having the male screw portion length L1 is provided in the middle, as shown in Fig. 17 and Fig. 18, the material-shaped reinforcing bar W1 can be used. In the roll forming, the escape threading portion 1e adjacent to the diameter-enlarged portion W1d is provided only on one of the diameter-enlarged portions W1d, and the other portion is directly connected to the enlarged-diameter portion W1d.

In addition, as shown in FIG. 19, in the case where one of the diameter-enlarged portions W1d is adjacent to the thread-removing portion 1e, the other thread may be provided with a shorter thread for avoiding the threading portion 1e. The portion 1g is formed. The escaping screw unformed portion 1g is the same as the escaping screw portion 1e, that is, the outer diameter of the reinforcing bar body 1a is larger than the general portion 1f, and the male thread is not formed. part. By forming the escaping screw unformed portion 1g, it is possible to prevent the cross-sectional dimension of the reinforcing bar 1 from rapidly changing from the enlarged diameter portion W1d to the normal portion 1f, and it is possible to gradually change. Therefore, stress concentration is less likely to occur, and the strength can be improved. .

Fig. 20 is a view showing a screw-type reinforcing bar joint of a deformed reinforcing bar according to a ninth embodiment of the present invention. In this example, the portion of the reinforcing bar 1 that is connected to the enlarged diameter portion W1d in which the male screw portion 1c is formed is not the circumscribing thread portion but the general portion 1f. Further, the male thread portions 1c, 1c of the reinforcing bars 1, 1 which are connected by one pair of the barrels 2 are opposite to each other in the direction of rotation. The barrel 2 is bounded at the center in the longitudinal direction such that the female screw portions 2a, 2a on both sides are opposite to each other in the direction of rotation.

As in the present embodiment, the male screw portions 1c, 1c of the reinforcing bars 1, 1 which are connected by the screw barrel 2 are mutually oppositely rotated, and the reinforcing bars 1, 1 on both sides are brought closer by the rotation of the screw barrel 2 The screw barrel 2 can be screwed into the male thread portion 1c, 1c of the reinforcing bars 1, 1 on both sides at the same time, so that the threading portion 1e can be easily connected without providing the threading portion 1e. Other structures and effects of the present embodiment are the same as those of the first embodiment shown in FIG. 1A and the like.

In each of the above-described embodiments, the cross-sectional area of the reinforcing bar 1 is set to (the male screw portion 1c) > (the threading portion 1e for avoidance) in the case where the threading portion 1e for the separation is provided (general portion 1f) However, the cross-sectional area of the portion of the reinforcing bar body 1a of the thread-removing portion 1e can be increased, and the relationship of (the thread-removing portion 1e) > (the male-thread portion 1c) > (the general portion 1f) can be obtained. The cross-sectional area of each portion of the reinforcing bar 1 herein refers to the sectional area of each portion which becomes the smallest cross-sectional portion. Also in the male thread part 1c, avoid In the threaded portion 1e, the thread groove portion has a small diameter through the formation of the thread groove. However, since the thread groove has a spiral shape, the half-cycle becomes a thread groove in the cross section of the reinforcing bar 1, and the remaining half is formed in the section 1ba. Threaded ridges, so the formation of the threaded grooves reduces the effect of the reduction in profile.

Figure 21 shows a tenth example of a screw-type rebar joint for joining steel bars of different diameters. In this example, the reinforcing bar 1 on the small diameter side is indicated by the symbol "1S", and the reinforcing bar 1 on the large diameter side is indicated by the symbol "1L".

In the example of Fig. 21, the barrel 2 is the same as the screw type reinforcing bar joint for connecting the reinforcing bars 1S on the small diameter side. The reinforcing bar 1S on the small-diameter side which is screwed to the barrel 2 has a male screw portion 1c and a thread-removing screw portion 1e which are connected to each other as shown in Figs. 11 to 14 . The male screw portion 1c ' of the reinforcing bar 1L on the large-diameter side of the large-diameter side is formed at the end portion of the reinforcing bar 1L in the same manner as the diameter-enlarged portion W1d (FIG. 7) of the small-diameter side reinforcing bar 1S. The true round portion of the diameter is formed by rolling on the outer circumference of the true round portion to form the male screw portion 1c ' . The screw-type reinforcing bar joint A connecting the reinforcing bars 1L on the large diameter side is the same as the example of Fig. 1A. Further, the screw-type reinforcing bar joint (not shown in Fig. 21) for connecting the reinforcing bars 1S on the small-diameter side is also the same as the example of Fig. 1A.

Further, as an example of the diameter of the reinforcing bar, the reinforcing bar 1S on the small diameter side is D16, and the reinforcing bar 1L on the large diameter side is D19. In the case of this configuration, it is not necessary to prepare the screw barrel 2 dedicated to connecting steel bars of different diameters, and the number of parts can be prevented from increasing.

Although the preferred embodiment has been described above with reference to the drawings, as long as it is generally known in the art, it is easy to follow the present specification. Think of various changes and corrections. Therefore, such changes and modifications are to be construed as included within the scope of the invention as defined by the appended claims.

1‧‧ ‧ steel bars

1a‧‧‧Steel body

1b‧‧‧

1ba‧‧‧ ribs

1bb‧‧

1c‧‧‧ Male thread

1e‧‧‧Dropping thread

1ea‧‧‧Spiral avoidance slot

2‧‧‧Rouge

2a‧‧‧Mask thread

Claims (12)

A screw-type steel joint of a special-shaped steel bar is a steel joint for connecting a pair of steel bars, and has a male thread portion at an opposite end portion of the steel bar which should be connected to each other, and a male thread portion extending through two steel bars a screw that is screwed; at least one of the reinforcing bars of the pair of reinforcing bars is a deformed reinforcing bar having a protrusion on an outer peripheral surface of the reinforcing bar body; and a reinforcing bar belonging to at least one of the deformed reinforcing bars is a wire made of iron as a material The ridge of the outer peripheral surface is formed by roll forming, and a diameter-enlarged portion having a diameter larger than that of the other portion is formed in a part of the longitudinal direction, and the outer diameter of the enlarged diameter portion is set to include the reinforcing bar. The reinforcing bar has a maximum outer diameter of the reinforcing bar, and the male screw portion is formed by rolling in the enlarged diameter portion; and the reinforcing bar belonging to at least one of the deformed reinforcing bars is connected to the base end of the male screw portion. The threading portion for avoiding the threading portion is a spiral escape groove formed by rolling on the outer peripheral surface of the protruding portion, the spiral escape groove being a female thread of the screw barrel Ministry The land is fitted. For example, in the screw-type reinforcing steel joint of the special-shaped steel bar of the first aspect of the patent application, wherein the portion of the deformed steel bar that constitutes the thread-avoiding portion is larger than the general portion of the deformed steel bar. For example, the screw-type steel joint of the special-shaped steel bar of the first application of the patent scope, wherein The reinforcing bar that forms the male screw portion has an enlarged diameter portion that is the same diameter as the enlarged diameter portion of the male screw portion and that does not form a male screw portion in the longitudinal direction of the reinforcing bar. a profiled steel bar with a threaded shape, which is a profiled steel bar connected by a screw-type steel joint of the first application of the patent scope; a protrusion on the outer peripheral surface of the steel body body and a male thread portion at the end; A wire made of iron as a material is formed by forming a ridge of the outer peripheral surface by roll forming, and forming a diameter-enlarged portion which is expanded in diameter in a part of the longitudinal direction, and the diameter-enhancing portion is formed. The outer diameter is set to be equal to or smaller than the outermost diameter of the reinforcing bar including the protrusion of the reinforcing bar, and the male screw portion is formed by rolling in the enlarged diameter portion; the deformed reinforcing bar provided with the thread and the male thread portion The portion connected to the base end is a thread-removing portion; the thread-removing portion is a spiral escape groove formed by the roll of the outer peripheral surface, and the spiral escape groove is a screw The threaded ridge of the female thread portion of the screw of the male thread portion is fitted. A profiled steel bar provided with a thread according to item 4 of the patent application, wherein an enlarged diameter portion in which a male thread portion is not formed is provided in the longitudinal direction of the steel bar, and the diameter of the male thread portion is increased. The diameter of the part is the same. a profiled steel bar provided with a thread according to item 5 of the patent application, wherein the aforementioned unformed male screw is disposed in the middle of the longitudinal direction of the reinforcing bar The enlarged diameter portion of the groove portion is the same as the length of the male screw portion. The profiled steel bar provided with the thread according to the fifth aspect of the invention, wherein the diameter-enlarged portion of the male thread portion is not formed in the middle of the longitudinal direction of the reinforcing bar, and the length thereof is about the length of the male thread portion. 2 times. The profiled steel bar provided with the thread according to any one of the items 4 to 7 wherein the threaded profiled steel bar has the male thread portion at both ends, and the male screw portion at one end is screwed with the screw. The cylinder is connected to other threaded shaped reinforcing bars; the male threaded portion at the other end is screwed with the anchoring plate by a female threaded portion formed on the inner circumference of the anchoring plate, and the anchoring plate is constructed to be anchored in the concrete. Rebar head. A manufacturing method of a profiled steel bar provided with a thread for manufacturing a thread having any one of claims 4 to 8 in which the outer peripheral surface of the reinforcing bar body has a protrusion and the male thread portion is formed at the end portion The profiled steel bar is formed of iron as a material, and the ridges of the outer peripheral surface are formed by roll forming, and a diameter-enlarged portion which is expanded in diameter in a part of the longitudinal direction is molded. The outer diameter of the enlarged diameter portion is set to be equal to or smaller than the outermost diameter of the reinforcing bar of the reinforcing bar, and the enlarged diameter portion is cut at the end portion, and the expanded portion of the deformed reinforcing bar is rolled. Male threaded part. For example, the threaded special-shaped steel bar of claim 9 In the manufacturing method, the roll for roll forming is rotated a plurality of times, and the material reinforcing bar having the enlarged diameter portion in the middle portion in the longitudinal direction is roll-formed, and the diameter-increased portion is formed at an arbitrary portion. The material-shaped reinforcing bar is cut at the end portion in the longitudinal direction, and the male screw portion is rolled at the enlarged diameter portion of the cutting portion. A manufacturing method of a profiled steel bar provided with a thread for manufacturing a thread having any one of claims 4 to 8 in which the outer peripheral surface of the reinforcing bar body has a protrusion and the male thread portion is formed at the end portion The profiled steel bar is formed of iron as a material, and the ridges of the outer peripheral surface are formed by roll forming, and a diameter-enlarged portion which is expanded in diameter in a part of the longitudinal direction is molded. The outer diameter of the expanded diameter portion is set to be equal to or smaller than the outermost diameter of the reinforcing bar of the reinforcing bar, and the enlarged diameter portion is cut in the middle, and the expanded diameter portion of the deformed reinforcing bar is rolled. Male threaded part. The method for producing a threaded profiled steel bar according to the eleventh aspect of the invention, wherein the roller for press forming is rotated a plurality of times, and the material having the enlarged diameter portion is provided at a plurality of portions in the middle in the longitudinal direction The steel bar is subjected to roll forming, and the material-shaped reinforcing steel bar is cut at the center portion in the longitudinal direction of the enlarged diameter portion of the arbitrary portion, and the male screw portion is rolled at the enlarged diameter portion of the cut portion.