JP2011190589A - Screw type reinforcing bar joint for deformed reinforcing bar, and threaded deformed reinforcing bar - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screw type reinforcing bar joint for deformed reinforcing bars, which allows easy formation of a male thread portion at an end of a reinforcing bar with excellent productivity, and is excellent in strength and connecting workability, and to allow mutual connection of reinforcing bars fixed respectively to concrete or the like. <P>SOLUTION: The reinforcing bar joint for connecting a pair of reinforcing bars 1, 1 includes a pair of double-side threaded cylinders 2, 2 and one connecting threaded cylinder 3. The opposed ends of both the reinforcing bars 1, 1 are made into male thread portions 1c threaded as diameter increased portions having a diameter equal to or less than a reinforcing bar maximum outer diameter D1 and equal to or more than an outer diameter D2 of the reinforcing bar body. The double-side threaded cylinder 2 has a female thread 2a and a male thread 2b formed respectively on the inner periphery and on the outer periphery, and is screwed to each male thread portion 1c of the reinforcing bars 1, 1. The connecting threaded cylinder 3 is screwed to the male threads 2b on the outer periphery of the double-side threaded cylinders 2, 2 on both the sides. In the double-side threaded cylinder 2, the lead of the female thread 2a is differed from the lead of the male thread 2b. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a threaded reinforcing bar joint of deformed reinforcing bars used for reinforced concrete, and more particularly to a threaded reinforcing bar joint of deformed reinforcing bars capable of connecting reinforcing bars already fixed to both concrete and the like and a threaded deformed reinforcing bar thereof.

In reinforced concrete, deformed reinforcing bars are generally used as the reinforcing bars. In long columns, beams, fabric foundations, etc., various reinforcing bar joints are used in order to make a limited length of reinforcing bars continuous in the field. As the reinforcing bar joint, a lap joint or a gas pressure welding joint in which the reinforcing bars are stacked by a predetermined length is generally used. However, the lap joint has a complicated bar arrangement structure due to the overlap, and the gas pressure joint has a drawback that the quality of the joint depends on the skill of the pressure welding.
Therefore, as a special joint, a joint for injecting grout with a reinforcing bar into the sleeve has been developed, and a threaded joint has been proposed (for example, Patent Document 1). The special joint for injecting grout into the sleeve is preferable in terms of simplification of the bar arrangement structure, and has been put to practical use. However, a curing period of about one day is required for hardening the grout, and the construction period is long. There are drawbacks. Threaded steel rebar joints do not require curing and can be constructed in a short time, but have not yet been put into practical use. In Patent Document 1, in order to ensure the connection strength, a diameter-enlarged portion is provided at the end of the reinforcing bar and screw processing is performed, or a separate large-diameter screw shaft is joined to the reinforcing bar end by friction welding. Is described.

JP 2002-227342 A

  The threaded reinforcing bar joint is excellent in that the construction can be performed in a short time as described above. However, in order to secure the connection strength, it is necessary to expand the diameter of the male thread at the end. As a method of this diameter expansion process, there are a method in which a separate large-diameter screw shaft is joined to the end of the reinforcing bar by friction welding and a method in which the reinforcing bar is heated to increase the diameter by applying a compressive force. However, these friction welding and heat compression processes require large-scale equipment to ensure accuracy and reliability, and it is difficult to ensure productivity.

  Further, when connecting reinforcing bars, there are cases where it is desired to connect reinforcing bars that have already been fixed to concrete or the like previously placed. In such a case, when it is going to connect with a screw-type reinforcing bar joint, it is necessary for the external thread part provided in the edge part of the reinforcing bar of both sides to be on the same virtual thread surface mutually. If the thread surface of the male threaded portion of the other reinforcing bar is displaced in the axial direction with respect to the virtual threaded surface obtained by extending the threaded surface of the male threaded portion of one reinforcing bar, the screw cylinder or the like cannot be screwed together. In order to enable screwing, it is not sufficient to adjust the position in the length direction. If the rotational phase when the female screw part of the screw cylinder is screwed with the male screw part is not matched, screwing is performed. I can't. For this reason, it is impossible to match the thread surfaces of the male thread portions of the reinforcing bars that are fixed first.

An object of the present invention is to provide a threaded reinforcing bar joint of a deformed reinforcing bar that is easy to form a male threaded portion at the end of a reinforcing bar, is excellent in productivity, and is excellent in strength and connection workability.
Another object of the present invention is to make it possible to connect rebars already fixed to concrete or the like.
Still another object of the present invention is to simplify the manufacture of threaded deformed reinforcing bars used in threaded reinforcing bar joints of deformed reinforcing bars and improve productivity.

  The threaded reinforcing bar joint of the deformed reinforcing bar of the present invention is a reinforcing bar joint that connects a pair of reinforcing bars that are deformed reinforcing bars each having a ridge on the outer peripheral surface of the reinforcing bar main body, and is an opposite end of the pair of reinforcing bars that are connected to each other The part is a male threaded part that is threaded as a diameter-enlarged part that is equal to or smaller than the outermost diameter of the reinforcing bar, which is the outer diameter of the reinforcing bar including the protrusion, and the inner peripheral surface is a female thread, and the outer peripheral surface is A pair of double-sided screw cylinders respectively formed on the male threads are screwed into the male screw portions of the pair of reinforcing bars, and are screwed into the male screws on the outer periphery across the pair of double-sided screw cylinders screwed into the male screw portions of both the reinforcing bars. A connection screw cylinder is provided.

According to the screw-type reinforcing bar joint with this configuration, the end of the reinforcing bar is a male threaded part that has been threaded as a diameter-enlarged part. Is secured. The male threaded part is processed into a diameter-enlarged part of the rebar, but the diameter-enlarged part is less than the outermost diameter of the reinforcing bar, which is the outer diameter of the reinforcing bar including the deformed reinforcing bar protrusions. It can be manufactured as a reinforcing bar. In other words, when roll forming deformed reinforcing bars, the reinforcing bars that move in the length direction in a heated state of red heat are guided in contact with the guides by the protrusions on the outer peripheral surface, but the outer diameter is increased beyond the protrusions. If there is a portion, the enlarged diameter portion is lifted in contact with the guide, and the reinforcing bar is bent. This bend remains to some extent even after the rebar is cooled, resulting in a deformed rebar with a bend. Therefore, such a thickened diameter-enlarged part cannot be manufactured at the time of reinforcing bar manufacture, and needs to be processed by heat compression as described above after the manufacture of the reinforcing bar is completed. However, if the diameter-enlarged part is below the outermost diameter of the reinforcing bar, which is the outer diameter of the reinforcing bar including the ridges, the reinforcing bar will not bend in contact with the guide during the manufacture of the reinforcing bar. It can be manufactured as a reinforcing bar. Therefore, it is not necessary to provide a diameter expansion processing facility separately from the reinforcing bar manufacturing facility, the facility can be simplified, and the productivity is excellent.
If it is a male thread part formed in the diameter-enlarged part below the outermost diameter of the reinforcing bar, the groove bottom diameter of the thread groove is smaller than the outermost diameter of the reinforcing bar, and if you try to screw the connecting screw cylinder directly into this, There arises a problem that the connecting screw cylinder interferes with the protrusion of the deformed reinforcing bar, but this problem is solved by the double-sided screw cylinder. In other words, when connecting with a connection screw cylinder, the connection screw cylinder is screwed inwardly beyond the male screw part until it does not protrude from one reinforcing bar, and the other reinforcing bar is opposed to the end of the one reinforcing bar. By screwing it back, it is screwed over the reinforcing bars on both sides. According to such a connection method, it is not necessary to move the rebar along with screwing when the connection screw cylinder is rotated and joined. However, in the case of the male threaded portion formed in the diameter-enlarged portion having the outermost outer diameter of the reinforcing bar, the connecting screw cylinder interferes with the protrusion of the one reinforcing bar whose outer diameter is larger than the inner diameter, and beyond the male threaded portion, Can not be screwed to the side. However, in the present invention, since the double-sided screw cylinder is screwed to the male screw part and the connection screw cylinder is screwed to the double-sided screw cylinder, the connection screw cylinder exceeds the male screw part to a position where the whole does not protrude from one reinforcing bar. It is possible to adopt a connection method in which the screw is screwed into the rear side and is screwed back to connect to the other reinforcing bar. Thereby, a connection operation can be performed without moving the rebar along with screwing.

  It is preferable that the male thread portion of the reinforcing bar is a rolled screw. Unlike the case of cutting a thread groove, there is no material removal, and the cross-sectional area is offset between the thread groove and the thread, and the expanded part has a limited range where the diameter of the expanded part is less than the outermost diameter of the reinforcing bar. Thus, the effect of reinforcement by expanding the diameter can be enhanced as much as possible.

  In the double-sided screw cylinder, the lead of the female screw and the lead of the male screw are preferably different from each other. If the leads of the female screw and male screw of the double-sided screw cylinder are different from each other, when connecting reinforcing bars that are already fixed to the concrete that was previously placed, the thread grooves of the reinforcing bars on both sides are the same virtual screw. Connection is possible even if not on the surface. That is, even if the thread surface of the male thread portion of the other reinforcing bar is displaced in the axial direction with respect to the virtual thread surface obtained by extending the thread surface of the male thread portion of the one reinforcing bar 1 already fixed, Therefore, when the double-sided screw cylinder is appropriately rotated, the male screw part of the other double-sided screw cylinder can be screwed into the male screw of the double-sided screw cylinder screwed into the male screw part of the reinforcing bar via the connection screw cylinder. The location which becomes the relationship between a direction position and a phase arises. Therefore, although it is a screw-type reinforcing bar joint, the reinforcing bars already fixed to both concrete and the like can be connected to each other.

The threaded deformed reinforcing bar according to the present invention is a deformed reinforcing bar in which a protrusion is formed on the outer peripheral surface of the reinforcing bar main body, and an end portion is equal to or less than the outermost outer diameter of the reinforcing bar including the protrusion, and the reinforcing bar main body. It is the male thread part screw-processed by rolling as an enlarged diameter part which becomes more than the outer diameter of this.
According to this structure, since it can be used for the screw-type reinforcing bar joint of the above-described deformed reinforcing bar of the present invention, and the diameter-expanding part is equal to or less than the outermost outer diameter of the reinforcing bar including the ridge, the diameter-expanding part at the time of manufacturing the deformed reinforcing bar It can be manufactured as a reinforcing steel bar. Therefore, it is not necessary to provide a diameter expansion processing facility separately from the reinforcing bar manufacturing facility, the facility can be simplified, and the productivity is excellent. Moreover, since it is a rolled screw, unlike the case of cutting a thread groove, there is no material removal, the cross-sectional area is offset between the thread groove and the thread, and the diameter-enlarged part is less than the outermost diameter of the reinforcing bar. Within the specified range, the effect of reinforcement by diameter expansion can be enhanced as much as possible.

The method for manufacturing a threaded deformed reinforcing bar according to the present invention is a method of manufacturing a threaded deformed reinforcing bar having a protrusion on the outer peripheral surface of a reinforcing bar main body and having a male threaded portion at an end, and is a deformed reinforcing bar as a material. At the time of manufacturing, the length range of a part of the reinforcing bar body at a plurality of locations in the length direction is equal to or less than the outermost diameter of the reinforcing bar body, which is the outer diameter including the protrusions, and more than the outer diameter of the reinforcing bar body of the other part. A large-diameter enlarged portion, and cut the deformed rebar as the raw material in the middle of each of the enlarged diameter portions, and rolling the male thread portion into the enlarged portion of each cut deformed rebar Features.
According to this method, it manufactures as a reinforcing bar with a diameter expansion part at the time of manufacture of a deformed reinforcing bar. Therefore, it is not necessary to provide a diameter expansion processing facility separately from the reinforcing bar manufacturing facility, the facility can be simplified, and the productivity is excellent. Since the diameter-enlarged portion is equal to or smaller than the outermost diameter of the reinforcing bar including the ridge, it can be manufactured as a reinforcing bar with an enlarged-diameter portion when manufacturing the deformed reinforcing bar. Also, since the male thread is rolled, unlike the case where the thread groove is cut, there is no material removal, the cross-sectional area is offset between the thread groove and the thread, and the diameter-enlarged portion is less than the outermost diameter of the reinforcing bar. Within the specified range, the effect of reinforcement by diameter expansion can be enhanced as much as possible.

  The threaded reinforcing bar joint of the deformed reinforcing bar of the present invention is a reinforcing bar joint that connects a pair of reinforcing bars that are deformed reinforcing bars each having a ridge on the outer peripheral surface of the reinforcing bar main body, and is an opposite end of the pair of reinforcing bars that are connected to each other The part is a male threaded part that is threaded as a diameter-enlarged part that is equal to or smaller than the outermost diameter of the reinforcing bar, which is the outer diameter of the reinforcing bar including the protrusion, and the inner peripheral surface is a female thread, and the outer peripheral surface is A pair of double-sided screw cylinders respectively formed on the male screws are screwed into the male screw portions of the pair of reinforcing bars, and are screwed into the male screws on the outer periphery over the pair of double-sided screw cylinders screwed into the male screw portions of both the reinforcing bars. Since the connecting screw cylinder is provided, it is easy to form the male threaded portion at the end of the reinforcing bar, and the threaded joint is excellent in productivity and excellent in strength and connection workability.

  The threaded deformed reinforcing bar according to the present invention is a deformed reinforcing bar in which a protrusion is formed on the outer peripheral surface of the reinforcing bar main body, and an end portion is equal to or less than the outermost outer diameter of the reinforcing bar including the protrusion, and the reinforcing bar main body. Since it is a male threaded part threaded by rolling as a diameter-enlarged part having an outer diameter equal to or larger than the outer diameter, it can be used for the threaded reinforcing bar joint of the deformed reinforcing bar of the present invention and can be manufactured with high productivity.

  The method for manufacturing a threaded deformed reinforcing bar according to the present invention is a method of manufacturing a threaded deformed reinforcing bar having a protrusion on the outer peripheral surface of a reinforcing bar main body and having a male threaded portion at an end, and is a deformed reinforcing bar as a material. At the time of manufacturing, the length range of a part of the reinforcing bar body at a plurality of locations in the length direction is equal to or less than the outermost diameter of the reinforcing bar body, which is the outer diameter including the protrusions, and more than the outer diameter of the reinforcing bar body of the other part. In order to roll a male thread part into the enlarged diameter part of each of the deformed reinforcing bars, cut into the enlarged diameter part of the large diameter, cut the deformed reinforcing bar as the material in the middle of each enlarged diameter reinforcing part, The deformed reinforcing bar used in the threaded reinforcing bar joint of the deformed reinforcing bar of the present invention can be manufactured with high productivity.

It is sectional drawing of the screw-type reinforcing bar joint of the deformed reinforcing bar which concerns on one Embodiment of this invention. It is a disassembled sectional view of the threaded reinforcing bar joint of the deformed reinforcing bar. It is process explanatory drawing which shows the manufacturing process of the deformed reinforcing bar used for the screw-type reinforcing bar joint of the deformed reinforcing bar.

An embodiment of the present invention will be described with reference to FIGS. This threaded reinforcing bar joint of deformed reinforcing bars is a reinforcing bar joint that connects a pair of reinforcing bars 1 and 1, and includes a pair of double-sided screw cylinders 2 and 2 and a single connecting screw cylinder 3. The reinforcing bars 1 are deformed reinforcing bars each having a protrusion 1b called a rib or the like on the outer peripheral surface of the reinforcing bar main body 1a. The opposing ends of the pair of rebars 1 and 1 connected to each other as a diameter-enlarging portion that is not more than the outermost diameter D1 of the reinforcing bar that includes the protrusion b and is not less than the outer diameter D2 of the reinforcing bar body. The threaded male thread 1c is used. The male screw portion 1c is preferably a rolled screw. As the protrusion 1b of the reinforcing bar 1, for example, a circular one extending over the entire circumference of the reinforcing bar main body 1a is provided at regular intervals in the longitudinal direction, and the axial direction is performed over the entire length of the part excluding the male screw part 1c of the reinforcing bar main body 1a. Are provided at a plurality of locations (2 to 4 locations) in the circumferential direction. The circular portion of the protrusion 1b may be divided into semicircles and alternately arranged in the longitudinal direction of the reinforcing bar.
The double-sided screw cylinder 2 has an inner peripheral surface formed on the female screw 2a and an outer peripheral surface formed on the male screw 2b over the entire length. The pair of double-sided screw cylinders 2 are formed on the male screw portions 1c of the pair of reinforcing bars 1 and 1, respectively. Screw together. The connection screw cylinder 3 is screwed to the outer male screw 2b across the pair of double-sided screw cylinders 2, 2 screwed to the male screw portions 1c of both the reinforcing bars 1,2.

  In the double-sided screw cylinder 2, the lead of the female screw 2a and the lead of the male screw 2b are different from each other. The male screw portion 1c of the reinforcing bar 1 and the female screw 3a of the connecting screw cylinder 3 are the same as the lead of the female screw 2a of the double-sided screw cylinder 2 and the male screw. The leads are respectively matched with the leads of 2b. The material of the double-sided screw cylinder 2 and the connection screw cylinder 3 is made of steel. Each of the male screw portion 1c, the male screw portion 2b, and the female screws 2a and 3a may have a thread groove cross-sectional shape of a triangle shape, a trapezoidal shape, a rectangular shape, or a curved shape. As the same. The spiral directions of the left and right screw grooves may be opposite to each other.

  The outer diameter of the external thread 2b of the reinforcing bar 1 is not more than the outermost diameter D1 of the reinforcing bar and not less than the outer diameter D2 of the main part of the reinforcing bar in the completed state. It is not necessary to be D1 or less, and it is sufficient that it is not more than the outermost diameter D1 of the reinforcing bar in the state of the diameter enlarged portion before rolling. This is because when the rolled screw is used, the outer diameter of the thread after rolling may be larger than the outer diameter of the material.

The reinforcing bar 1 having the male screw portion 1c is manufactured as follows. As shown in FIG. 3, at the time of manufacturing a long deformed reinforcing bar W1 as a raw material, a part of the longitudinal length L of the reinforcing bar main body W1a at a plurality of locations in the length direction is represented by an outer diameter including the protrusion 1b. The diameter-enlarged portion W1d is equal to or less than the outermost diameter D1 and larger than the outer diameter D2 of the other portion of the reinforcing bar body W1a. This material deformed reinforcing bar W1 is manufactured by rolling a round bar made of iron by hot roll forming or the like to form the protrusion 1b. In the rolling process by this roll forming or the like, the enlarged diameter portion W1d is formed. Provide. Since the enlarged diameter portion W1d is not more than the outermost diameter D1 of the reinforcing bar, the material deformed reinforcing bar in a heated state in contact with the protrusion 1b of the deformed reinforcing bar W1 of the material deformed by roll forming of the long deformed reinforcing bar W1 as the material. The deformed reinforcing bar W1 is manufactured without causing the problem of bending of the deformed reinforcing bar W1 due to the diameter-enlarging part W1d not contacting the guide (not shown) for guiding W1. be able to.

The deformed reinforcing bar W1 that is the material thus manufactured is cut in the middle of each enlarged diameter portion W1d, and a plurality of deformed reinforcing bars W1 ′ with an enlarged diameter portion having a predetermined length having enlarged diameter portions W1d at both ends. Get a book. The deformed reinforcing bar W1 ′ having an enlarged diameter portion having a predetermined length is, for example, a multiple of a module (eg, 910 mm, 1000 mm, etc.) of a module designed for building when applied to a building foundation such as a house, or the module Is preferably a multiple of 1/2 the length. A male threaded portion 1c is processed by rolling the diameter-enlarged portion W1d of each of the cut deformed reinforcing bars W1 'to form a reinforcing bar 1 having male threaded portions 1c having diameters expanded at both ends.

  According to the threaded reinforcing bar joint of the deformed reinforcing bar having this configuration, since the end portion of the reinforcing bar 1 is the male threaded portion 1c that is threaded as the diameter-expanded portion W1d, the diameter of the male threaded portion 1c is larger than that of the threaded portion as it is. Is thick and the strength of the connecting portion is secured. The male threaded portion 1c is processed into a rebar expanded diameter portion W1d. However, since the expanded diameter portion W1d is equal to or smaller than the outermost diameter D1 of the rebar including the protrusion 1b of the deformed rebar 1, the material deformed rebar W1. It can be manufactured as a reinforcing bar with a diameter-enlarging part at the time of manufacture. That is, when roll-forming the material deformed reinforcing bar W1 as described above, the reinforcing bar moving in the length direction in a red hot state is guided in contact with a guide (not shown) by the protrusion 1b on the outer peripheral surface. However, if there is an enlarged diameter portion having an outer diameter equal to or greater than the protrusion 1b, the enlarged diameter portion is lifted in contact with the guide, and the reinforcing bar is bent. This bend remains to some extent even after the rebar is cooled, resulting in a deformed rebar with a bend. Therefore, such a thickened diameter-enlarged part cannot be manufactured at the time of reinforcing bar manufacture, and needs to be processed by heat compression as described above after the manufacture of the reinforcing bar is completed. However, if the diameter-enlarging portion W1d is equal to or smaller than the outermost diameter D1 of the reinforcing bar including the protrusion 1b, the reinforcing bar does not bend in contact with the guide when the reinforcing bar is manufactured, and is expanded when the deformed reinforcing bar W1 is manufactured. It can be manufactured as a reinforcing bar with a sizing part. Therefore, it is not necessary to provide a diameter expansion processing facility separately from the reinforcing bar manufacturing facility, the facility can be simplified, and the productivity is excellent.

  When the male screw portion 1c is formed in the enlarged diameter portion W1d having the outermost diameter D1 or less of the reinforcing bar, the groove bottom diameter of the screw groove is smaller than the outermost diameter D1 of the reinforcing bar, and directly connected to the screw cylinder 3 If it is going to screw together, the problem which the connection screw cylinder 3 interferes with the protrusion of a deformed reinforcing bar will arise. However, this interference problem is solved by the double-sided screw cylinder 2. That is, when the connection screw cylinder 3 is connected, the connection screw cylinder 3 extends beyond the male screw portion 1c to a position where the entire connection screw cylinder 3 does not protrude from one of the reinforcing bars 1 (right side in the figure) as shown by a chain line in FIG. The other reinforcing bar 1 is opposed to the end of the one reinforcing bar 1 and then screwed back to be screwed over the reinforcing bars on both sides as shown by the solid line in FIG. According to such a connection method, when the connection screw cylinder 3 is rotated and joined, there is no need to move the other reinforcing bar 1 along with screwing. However, if the connecting screw cylinder is directly screwed into the external thread portion 1c having the outermost diameter D1 or less of the reinforcing bar, the connecting screw cylinder interferes with the protrusion 1c of the one reinforcing bar 1 whose outer diameter is larger than the inner diameter. However, it cannot be screwed into the back side beyond the male screw portion 1c. However, in this embodiment, since the double-sided screw cylinder 2 is screwed to the male screw portion 1c and the connection screw cylinder 3 is screwed to the double-sided screw cylinder, the entire connection screw cylinder 3 does not protrude from one reinforcing bar 1. It is possible to employ a connection method in which the screw is screwed to the far side beyond the male screw portion 1c to the position and is screwed back to be connected to the other reinforcing bar 1. Thereby, a connection operation can be performed without moving the rebar along with screwing. Therefore, connection work can be performed easily.

  Unlike the case where the thread groove is cut, the male thread portion 1d of the reinforcing bar 1 has no material removal, and the cross-sectional area is offset between the thread groove and the thread. In the limited range of the outer diameter D1 or less, it is possible to enhance the effect of reinforcement by expanding the diameter as much as possible.

  In the double-sided screw cylinder 2, the lead of the female screw 2 a and the lead of the male screw 2 b are different from each other. Therefore, when connecting the reinforcing bars 1 that are already fixed to concrete or the like previously placed, both the reinforcing bars on both sides are connected. Connection is possible even if the thread grooves of the 1 and 1 male thread portions 1c are not on the same virtual thread surface. That is, even if the thread surface of the male thread portion 1c of the other reinforcing bar 1 is displaced in the axial direction with respect to the virtual thread surface obtained by extending the thread surface of the male thread portion of the one reinforcing bar 1, the lead of the lead Due to the difference, when the double-sided screw cylinder 2 is appropriately rotated, the male screw of the other double-sided screw cylinder 2 is connected to the male screw 2b of the double-sided screw cylinder 2 screwed into the male screw portion 1c of the reinforcing bar 1 via the connecting screw cylinder 3. The location which becomes the relationship of the length direction position and phase which can be screwed to 2b arises. Therefore, although it is a screw-type reinforcing bar joint, the reinforcing bars already fixed to both concrete and the like can be connected to each other. When reinforcing bars already fixed to both concrete and the like are connected to each other, the double-sided screw cylinder 2 is screwed into the male threaded portion 1c into either one of the reinforcing bars 1 until the concrete placement of both concrete is completed. At the same time, the connection screw cylinder 3 is screwed into a position where it does not protrude from the double-sided screw cylinder 2 toward the reinforcing bar tip side, and the double-sided screw cylinder 2 is screwed into the male screw portion 1c into the other reinforcing bar.

  Moreover, according to the manufacturing method of the above-mentioned threaded deformed reinforcing bar, it is manufactured as a reinforcing bar with a diameter-enlarging portion W1d at the time of manufacturing the deformed reinforcing bar W1 as a material. Therefore, it is not necessary to provide a diameter expansion processing facility separately from the reinforcing bar manufacturing facility, the facility can be simplified, and the productivity is excellent. Since the enlarged diameter portion W1d is equal to or smaller than the outermost diameter D1 of the reinforcing bar including the protrusion 1b, it can be manufactured as a reinforcing bar with an enlarged diameter portion when the deformed reinforcing bar W1 is manufactured. Further, since the male threaded portion 1c is rolled, unlike the case where the thread groove is cut, the material is not removed, the cross-sectional area is offset between the thread groove and the thread, and the diameter-enlarged portion is less than the outermost diameter of the reinforcing bar. In such a limited range, the effect of reinforcement by diameter expansion can be enhanced as much as possible.

  In addition, it is preferable that the enlarged diameter portion W1d is formed in the manufacturing process of the deformed reinforcing bar W1 as described above when the outer diameter D2 of the reinforcing bar main body is 19 mm or less. When the reinforcing bar has an outer diameter of 19 mm or less, the operation of forming the enlarged diameter portion W1d in the manufacturing process of the deformed reinforcing bar W1 can be easily performed without causing distortion or the like. Such a small-diameter deformed reinforcing bar 1 is used in a cloth foundation of a house, and the threaded reinforcing bar joint of the present invention and the above embodiment can be used effectively. In addition, for reinforcing steel joints, grades are determined by building standards, etc. depending on the place of use, etc., but not for high grades such as SA grade and A grade, but for lower grade B grade or less reinforcing joints such as SA grade and A grade. High accuracy is not required compared to the class. For this reason, the male screw having the required accuracy can be obtained by directly performing the rolling screw processing by omitting the pre-processing to form a round shape for the enlarged diameter portion W1d formed in the reinforcing bar manufacturing process as described above. Part 1c can be obtained. Reinforcing bar reinforcing joints for cloth foundations in houses may be grade B or lower, and the threaded reinforcing bar joint of the above embodiment can be used effectively.

DESCRIPTION OF SYMBOLS 1 ... Reinforcing bar 1a ... Reinforcing bar main body 1b ... Projection 2 ... Double-sided screw cylinder 2a ... Female screw 2b ... Male screw 3 ... Connection cylinder 3a ... Female screw D1 ... Rebar outermost diameter D2 ... Outer diameter W1 of reinforcing bar main body Deformed bar W1d ... Diameter expansion part

Claims (5)

Reinforcing bar joints that connect a pair of reinforcing bars, each of which is a deformed reinforcing bar with protrusions on the outer peripheral surface of the reinforcing bar body,
The opposite ends of a pair of reinforcing bars connected to each other are male threaded portions that are threaded as a diameter-enlarged portion that is equal to or smaller than the outermost diameter of the reinforcing bar that is the outer diameter of the reinforcing bar including the protrusions and that is equal to or larger than the outer diameter of the reinforcing bar body. The pair of double-sided screws in which a pair of double-sided screw cylinders having an inner peripheral surface formed on a female screw and an outer peripheral surface formed on a male screw are screwed into the male screw portions of the pair of reinforcing bars and screwed into the male screw portions of both the reinforcing bars. A threaded reinforcing bar joint for deformed reinforcing bars, characterized in that a connecting screw cylinder is provided that is screwed into a male screw on the outer periphery over the cylinder.   The threaded reinforcing bar joint of the deformed reinforcing bar according to claim 1, wherein the male thread portion of the reinforcing bar is a rolled screw.   3. The threaded reinforcing bar joint of deformed reinforcing bar according to claim 1, wherein the lead of the female screw and the lead of the male screw of the double-sided screw cylinder are different from each other.   A deformed reinforcing bar in which ridges are formed on the outer peripheral surface of the reinforcing bar main body, the end of which is not larger than the outermost outer diameter of the reinforcing bar, which is the outer diameter of the reinforcing bar including the protruding ridges, and larger than the outer diameter of the reinforcing bar main body. A threaded deformed reinforcing bar characterized by being a male threaded part threaded by rolling as a part. A method of manufacturing a threaded deformed reinforcing bar having a protrusion on the outer peripheral surface of a reinforcing bar main body and having a male threaded portion at an end part,
At the time of manufacturing the deformed rebar as the material, the length range of a part of the rebar main body at a plurality of locations in the length direction is equal to or less than the rebar outermost diameter that is the outer diameter including the protrusions and the rebar main body of the other part An enlarged diameter portion larger than the outer diameter of the outer diameter of the deformed reinforcing bar as the material is cut in the middle of each enlarged diameter portion, and a male screw portion is formed in the enlarged diameter portion of each of the deformed reinforcing bars. The manufacturing method of the deformed reinforcing bar with a screw characterized by rolling.

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