JP6533752B2 - Joint structure and construction method of joint structure - Google Patents

Description

  The present invention relates to a joint structure in which ends of two threaded joint bars are connected and fixed with a coupler, and a method of constructing the joint structure.

  In order to connect deformed bar steels which are reinforcements of concrete structures for civil engineering and construction, couplers that can be screwed to a deformed bar steel (a screw joint rebar) having a flat surface and a screw joint formed on the outer periphery are used. When joining the leading side threaded joint rebar and the joining side threaded joint rebar using such a coupler in the joining method of a concrete structure, the leading side threaded joint rebar is inserted into the integrated coupler. Insert the end of the joint side thread knot rebar, and screw the joint side thread knot rebar to the coupler.

  According to Patent Document 1, about half of the coupler is fitted to the leading side threaded joint bar, torque is introduced to the lock nut, and the leading side threaded joint bar is fixed to the coupler, and then the connecting side threaded joint bar is used as the coupler. It is disclosed to engage and to introduce torque in a state in which the joining side thread knot rebar is pressed against the end face of the leading side thread knot rebar.

  Patent Document 2 discloses that the leading side rebar is friction welded to the bag-like coupler, the male side screw is metrically welded to the joining rebar, and the male screw is engaged with the coupler to introduce torque. It is done.

  In Patent Document 3, the preceding rebar is friction welded to the bag-like coupler, the external thread of metric screw is welded to the end of the joining rebar, and the external thread is engaged with the coupler to introduce torque. It is disclosed.

JP-A-9-209504 JP-A-7-224495 JP-A-8-261216

  However, in the joint structure described in Patent Document 1 as described above, the joint performance can not be secured unless high torque is introduced to the lock nut on the leading side as the diameter of the reinforcing bar and the diameter of the coupler increase, and special tools and There is a problem that a work environment is required. In addition, for confirmation of tightening of the lock nut and retightening of the lock nut, the operator visually checks the presence or absence of the misalignment of the mark provided so as to straddle the coupler end and the lock nut end when torque is introduced to the lock nut. There is a problem that the tightening operation of the lock nut is complicated.

  It is also conceivable to form a coupler in a bag shape and reduce the number of lock nuts installed, as in the joint structure described in Patent Documents 2 and 3, in order to omit such a tightening operation and tightening confirmation of the lock nut. However, in rough-shaped joints with large pitches such as threaded joints, there is a problem that the coupler can not be formed into a bag shape by cutting with a tap.

  Further, in the joint structure described in Patent Document 2 as described above, it is necessary to rotate the male screw at high speed when frictionally pressing the male screw and the leading side rebar, but the number of parts increases, and a plurality of friction welding processes are performed. There is a problem that the manufacturing operation becomes complicated because it has to be performed once.

  Further, in the joint structure described in Patent Document 3 as described above, when the male screw and the leading side rebar are welded, since the rebar has a large amount of carbon and the hardenability is strong, quench hardening occurs after welding and secures the strength In order to do this, there has been a problem that preheating and post heat treatment are required.

  Then, this invention is made in view of such a conventional subject, and it aims at joining screw knot reinforcements simply and firmly.

The present invention has been proposed to achieve the above object, and the invention according to claim 1 is a joint structure for connecting and fixing the ends of the leading side threaded joint rebar and the joining side threaded joint rebar. Coupler body formed in the shape of a through hole, a through hole formed from one end face to the other end face in the coupler body, and an inner periphery of the through hole are cut to form a screw on the connecting side screw knot rebar The coupler having a compatible node portion and a female screw portion formed on one end side of the through hole is friction welded to the end face of the leading side threaded rod rebar, and can be screwed to the female screw portion And a lid for closing one end of the through hole of the coupler.

  According to this configuration, the coupler can be formed into a bag shape by forming a node portion having a large pitch in the cylindrical coupler body and closing one end of the through hole with the intermediate member.

In addition, since the coupler is formed in a bag shape and the leading side threaded rod reinforcement is friction welded to the intermediate member, the work of introducing the torque to the leading side threaded rod reinforcement is omitted. It is possible to simply join the joint side screw joint rebar. Furthermore, by closing one end of the through hole with the female screw portion, it is possible to form a bag-like coupler having a large pitched node portion. In addition, because the lead side screw knot rebar is friction welded to the female screw part, the work of introducing torque to the lead side screw knot rebar is omitted, so It can join simply. Furthermore, since torque can be introduced to the joining side threaded joint rebar in a state where the joining side threaded joint rebar is in direct contact with the end face of the female screw portion, the leading side threaded joint rebar and the joining side threaded joint rebar are strengthened It can be joined.

The invention according to claim 6 is the method for constructing a joint structure in which the ends of the leading side threaded joint bar and the joining side threaded joint bar are connected and fixed with a coupler, the through hole formed from one end face to the other end face When the node portions which are formed by cutting the inner periphery of the through hole, a female threaded portion formed on one end side of the through hole, a cylindrical said coupler having a said female threaded portion A step of preparing a lid portion provided with an externally threadable screw portion, a step of screwing the female thread portion to the male thread portion, and closing the one end of the through hole with the lid portion , A method of constructing a joint structure is provided, including the steps of: friction welding pressure welding a lid portion to the end face of the leading side threaded joint bar; and screwing the joint side threaded joint bar to the joint side threaded joint bar.

  According to this configuration, the coupler can be formed into a bag shape by forming one of the nodes in the cylindrical coupler body and closing one end of the through hole with the intermediate member.

In addition, since the coupler is formed in a bag shape and the leading side threaded rod reinforcement is friction welded to the intermediate member, the work of introducing the torque to the leading side threaded rod reinforcement is omitted. It is possible to simply join the joint side screw joint rebar. Furthermore, by closing one end of the through hole with the female screw portion, it is possible to form a bag-like coupler having a large pitched node portion. In addition, because the lead side screw knot rebar is friction welded to the female screw part, the work of introducing torque to the lead side screw knot rebar is omitted, so It can join simply. Furthermore, since torque can be introduced to the joining side threaded joint rebar in a state where the joining side threaded joint rebar is in direct contact with the end face of the female screw portion, the leading side threaded joint rebar and the joining side threaded joint rebar are strengthened It can be joined.

According to the present invention, the coupler can be formed into a bag shape by forming a node portion having a large pitch in the tubular coupler body and closing one end of the through hole with the lid portion . In addition, since the coupler is formed in a bag shape and the leading side screw knot rebar is friction-joined to the lid , the work of introducing the torque to the leading side screw knot rebar is omitted, so It is possible to simply join the joint side screw joint rebar.

BRIEF DESCRIPTION OF THE DRAWINGS Sectional drawing which shows the coupling structure which concerns on the 1st Example of this invention. It is a figure which shows the coupler of FIG. 1, (a) is a front view, (b) is a side view, (c) is the II sectional view taken on the line of FIG.2 (b). The schematic diagram which shows the procedure which builds the joint structure of FIG. Sectional drawing which shows the modification of the coupling structure of FIG. Sectional drawing which shows the coupling structure which concerns on the 2nd Example of this invention. The schematic diagram which shows the procedure which builds the joint structure of FIG. Sectional drawing which shows the coupling structure which concerns on the 3rd Example of this invention. It is a figure which shows the coupler of FIG. 7, (a) is a front view, (b) is the II-II sectional view taken on the line of (a) of FIG. FIG. 8 is a schematic view showing a procedure for constructing the joint structure of FIG. 7;

The present invention has a tubular shape in a joint structure in which the ends of the leading side threaded joint bar and the joining side threaded joint bar are connected and fixed in order to achieve the purpose of simply and firmly joining the threaded joint bars. Joint portion formed by cutting the inner periphery of the coupler body, the through hole formed in the coupler body from one end face to the other end face, and the inner periphery of the through hole And a coupler provided with a female screw formed at one end of the through hole, and a male screw that can be friction welded to the end face of the leading side threaded rod reinforcement and screwable to the female screw, And a lid for closing one end of the through hole.

The present invention also provides a joint structure in which the ends of the leading side threaded joint rebar and the joining side threaded joint rebar are connected and fixed with a coupler in order to achieve the purpose of simply and firmly joining the threaded joint bars. In the construction method, a through hole formed from one end face to the other end face, a node portion formed by cutting an inner periphery of the through hole, and a female screw portion formed on one end side of the through hole; a cylindrical couplers and a step of preparing a lid portion having a threadedly male screw portion into the female screw portion, by screwing the female screw portion in the male threaded portion, one of the through holes This is realized by including the steps of closing the end with the lid , the step of friction welding the lid to the end face of the leading side threaded knot rebar, and the step of screwing the knot on the tapping side threaded knot rebar.

  Hereinafter, a joint structure 1 according to a first embodiment of the present invention will be described based on the drawings. In the following examples, when referring to the number, numerical value, amount, range, etc. of the constituent elements, the specific number thereof unless specifically stated or when clearly limited to a specific number in principle. The number is not limited to a specific number, and may be a specific number or less.

  In addition, when referring to the shapes of components, etc., and positional relationships, those that are substantially similar or similar to the shapes etc., unless specifically stated otherwise or where it is considered to be otherwise clearly apparent in principle Including.

  In the drawings, characteristic parts may be enlarged or enlarged to make features easy to understand, and dimensional ratios of constituent elements are not necessarily the same as in actuality. In addition, in the cross-sectional view, hatching of some components may be omitted in order to make the cross-sectional structure of the components intelligible.

  FIG. 1 is a cross-sectional view showing a joint structure 1 according to a first embodiment of the present invention. 2 is a view showing the coupler 4 of FIG. 1, (a) is a front view, (b) is a side view, and (c) is a cross-sectional view taken along the line II of (b).

  In the joint structure 1, the ends of the leading side threaded joint rebar 2 and the connecting side threaded joint rebar 3 are joined together by the coupler 4. That is, the leading side screw knot rebar 2 and the coupler 4 are embedded in the concrete, and the joining side screw knot rebar 3 is inserted into the coupler 4 and screwed, whereby the leading side screw knot rebar 2 and the striking The joint side thread joint rebar 3 is joined. The connection side screw joint rebar 3 is a reinforcing material which protrudes from the end of the concrete structure for civil engineering and construction.

  The leading side threaded joint rebar 2 is provided with a flat surface 2a and a threaded joint 2b on the outer periphery. The leading side threaded joint rebar 2 is fixed to the coupler 4 via a lid 5 as an intermediate member. The leading side threaded joint bars 2 and the couplers 4 are embedded in concrete.

  A flat surface 3a and a threaded joint 3b are provided on the outer periphery of the joining side threaded joint rebar 3. As the joining side screw joint rebar 3 is screwed into the coupler 4, the leading side joint rib 2 and the joining side joint rib 3 are integrally joined.

  The coupler 4 is made of, for example, carbon steel such as carbon steel for machine structural use. The coupler 4 cuts the inner periphery of the coupler body 41 formed in a tubular shape having a hexagonal cross section, the through hole 42 formed in the coupler body 41 from one end face 4 a to the other end face 4 b, and the inner periphery of the through hole 42 And the joint 43 formed.

  The joint portions 43 are arranged in a row at predetermined intervals along the longitudinal direction L of the coupler body 41. The joint portion 43 is formed by cutting a ridge formed in a spiral shape in the through hole 42 along the longitudinal direction L of the coupler 4. The rows of the nodal portions 43 are two rows, which are disposed to face each other. The joint portion 43 can be screwed with the joint 3b of the joint side joint ring 3, and is formed in a rough shape having a large pitch as compared with a metric screw.

  The lid 5 is formed in a disk shape. The lid 5 is made of, for example, non-refined high-strength steel or carbon steel for machine structure. The lid 5 has one side 5 a frictionally welded to the end of the leading side threaded rod 2, and the other side 5 b frictionally welded to one end 4 a of the coupler 4. When the lid 5 closes one end side of the through hole 42, the tubular coupler 4 is formed in a bag shape. In addition, the code | symbol B1 in FIG. 1 is a burr | flash produced when carrying out friction welding of the cover part 5 to the leading side screw knot reinforcement 2, and the code | symbol B2 arises when carrying out friction welding of the cover part 5 to the coupler 4. It is Bali.

  Next, the procedure of constructing the joint structure 1 according to the first embodiment of the present invention will be described based on FIG. FIG. 3: is a schematic diagram which shows the procedure which constructs | assembles the joint structure 1 which concerns on a present Example.

  First, as shown in FIG. 3A, the end face of the leading side threaded joint rebar 2 and the one surface 5a of the lid 5 are friction-welded. Specifically, the lid 5 is rotated at a high speed in a state where the outer periphery of the lid 5 is gripped, one surface 5a of the lid 5 is brought into contact with the end surface of the distal end side screw knot rebar 2 and frictional heat is generated at the contact portion Let Thereafter, the rotation of the lid 5 is rapidly stopped, and the leading side screw knot rebar 2 is pressed against the lid 5 to join the leading side screw knot reinforcing rod 2 and the lid 5.

  Next, as shown in FIG. 3B, the one end surface 4a of the coupler 4 and the other surface 5b of the lid 5 are friction-welded. As a result, the opening 42a opened to the one end surface 4a of the through hole 42 is closed, and the coupler 4 is formed in a bag shape.

  Next, as shown in FIG. 3 (c), the joint side screw joint rebar 3 is screwed into the joint 43 of the coupler 4. When inserting the joining side screw joint rebar 3 into the coupler 4, the joining side screw joint rebar 3 in a state where the flat surface 3 a of the joining side screw joint rebar 3 is opposed to the node portion 43 with a gap. Slide until the tip of the contacts the burr B2. Thereafter, the joint side screw joint rebar 3 is rotated to screw the screw joint 3 b of the joint side screw joint rebar 3 and the joint 43.

  In addition, as shown in FIG. 3D, it is preferable to attach the lock nut 6 to the joining side threaded joint rebar 3. As a result, even if it is not possible to sufficiently fix when the tip of the joining side screw joint rebar 3 contacts the burr B2 in the through hole 42, the joining side screw is introduced by introducing torque into the lock nut 6. The joint rebar 3 can be fixed.

  In this manner, the joint structure 1 according to the present embodiment is configured such that the coupler 4 is formed by closing the one end of the through hole 42 with the lid 5 after the nodes 43 having a large pitch are formed in the cylindrical coupler body 41. Can be formed into a bag shape.

  In addition, since the coupler 4 is formed in a bag shape and the leading side screw knot rebar 2 is friction welded to the lid 5, the work of introducing the torque to the leading side screw knot rebar 2 is omitted. The threaded joint 2 and the joint side threaded joint 3 can be simply joined.

  Next, a modification of the joint structure 1 according to the above-described first embodiment will be described based on the drawings. In addition, about the structure which is common in this modification and 1st Example mentioned above, a common code | symbol is attached | subjected and the overlapping description is abbreviate | omitted. FIG. 4 is a cross-sectional view showing a modification of the joint structure 1.

  The lid 5 is provided at the center of the other surface 5 b and includes a convex portion 51 which is fitted into the through hole 42. The diameter of the convex portion 51 is set to be slightly smaller than the diameter of the through hole 42. When the convex portion 51 blocks the through hole, the burr B2 generated when the cover 5 is frictionally pressed to the coupler 4 is prevented from entering the through hole 42, and the tip of the joint side screw knot rebar 3 is convex It becomes possible to contact the part 51.

  As a result, the lid 5 is frictionally pressure-bonded to the coupler main body 41 in a state in which the convex portion 51 is inserted into the through hole 52, and burrs are prevented from flowing into the through hole 52. Since it is possible to introduce torque to the joint side screw joint rebar 3 in a state where the joint bar 3 is in direct contact with the lid 4, the leading side screw joint rebar 2 and the joint side screw joint rebar 3 can be joined firmly it can.

  Next, a joint structure 1 according to a second embodiment of the present invention will be described based on the drawings. About the composition which is common in the 2nd example and the 1st example mentioned above, the common numerals are attached and the overlapping explanation is omitted. FIG. 5 is a cross-sectional view showing a joint structure 1 according to a second embodiment of the present invention.

  The coupler 4 is made of, for example, a mild steel of carbon steel for machine structural use or spheroidal graphite cast iron. The coupler 4 is provided with a female thread portion 44 of metric thread machined on one end side of the through hole 42. The inner diameter of the female screw portion 44 is equal to or larger than the diameter of the through hole 42.

  The joint structure 1 includes an external thread 7 as an intermediate member. The male screw 7 is a metric screw and is screwed to the female screw 44. The length of the male screw 7 is, for example, the same as the total length of the female screw 44 or several mm. One surface 7 a of the male screw 7 is friction welded to the end surface of the leading side threaded joint rebar 2. Further, the other surface 7 b of the male screw portion 7 is in contact with the end surface of the joining side screw joint rebar 3. In addition, the code | symbol B3 in FIG. 5 is a burr | flash produced when carrying out the friction welding of the external thread part 7 to the leading side screw knot rebar 2.

  Next, the procedure of constructing the joint structure 1 according to the second embodiment of the present invention will be described based on FIG. FIG. 6 is a schematic view showing a procedure of constructing the joint structure 1 according to the present embodiment.

  First, as shown in FIG. 6A, the male screw 7 is screwed to the female screw 44 of the coupler 4. By forming the female screw portion 44 to have the same diameter as or larger than that of the through hole 42, the other surface 7 b of the male screw portion 7 is suppressed from protruding further than the female screw portion 44. Is positioned at a predetermined position. By screwing the male screw 7 to the female screw 44, the opening 42a opened at the one end face 4a of the through hole 42 is closed, and the coupler 4 is formed in a bag shape.

  Next, as shown in FIG. 6 (b), the end face of the leading side threaded joint bar 2 and the one surface 7 a of the male screw portion 7 are friction-welded. Specifically, the coupler 4 is rotated at a high speed in a state where the outer periphery of the coupler body 41 is gripped, one surface 7a of the male screw 7 is brought into contact with the end surface of the distal end side thread reinforcement 2 and friction heat is generated at the contact portion Let Thereafter, the rotation of the coupler 4 is rapidly stopped, and the leading side screw knot rebar 2 is pressed toward the male screw 7 to join the leading side screw knot reinforcing rod 2 and the male screw 7.

  Next, as shown in FIG. 6 (c), the thread section 3 b of the connecting side thread section rebar 3 is screwed into the section 43 of the coupler 4. When inserting the joining side screw joint rebar 3 into the coupler 4, the joining side screw joint rebar 3 in a state where the flat surface 3 a of the joining side screw joint rebar 3 is opposed to the node portion 43 with a gap. Until the tip of the screw contacts the other surface 7 b of the male screw 7. Thereafter, the joint side screw joint rebar 3 is rotated about the axial direction A, and the screw joint 3b of the joint side screw joint rebar 3 and the joint 43 are screwed together.

  In addition, as shown in FIG. 6 (d), it is preferable to attach the lock nut 6 to the joining side threaded joint rebar 3. As a result, by introducing torque into the lock nut 6, it is possible to securely fix the joining side threaded joint rebar 3.

  Thus, in the joint structure 1 according to the present embodiment, the one end of the through hole 42 is closed by the male screw 7 to form the bag-like coupler 4 having the node 43 having a large pitch. Can.

  In addition, the work of introducing torque to the leading side threaded joint rebar 2 is omitted by the leading side threaded joint rebar 2 being friction welded to the one surface 7 a of the male screw portion 7. It is possible to simply join the joint side screw joint rebar 3.

  Furthermore, since the torque can be introduced to the joining side threaded joint rebar 3 in a state where the joining side threaded joint rebar 3 is in direct contact with the other surface 7b of the external thread 7, the leading side threaded joint rebar 2 and the joining side screw The joint bars 3 can be firmly joined.

  Next, a joint structure 1 according to a third embodiment of the present invention will be described based on the drawings. The same reference numerals will be assigned to components common to the third embodiment and the first embodiment described above, and the redundant description will be omitted. FIG. 7 is a sectional view showing a joint structure 1 according to a third embodiment of the present invention. FIG. 8 is a view showing the coupler of FIG. 7, (a) is a front view, and (b) is a cross-sectional view taken along the line II-II of (a).

  The coupler 4 is formed in a cylindrical shape, and may be made of any material such as a soft steel or a spheroidal graphite cast iron. The coupler 4 is provided with a male screw 45 of metric screw formed on the outer periphery of the coupler body 41.

  The joint structure 1 includes an internal thread 8 as an intermediate member. The female screw portion 8 is made of, for example, a mild steel material. The female screw portion 8 is formed in a U-shape in cross section, a metric screw is formed on the inner circumferential side surface, and is screwed into the male screw portion 45. One surface 8 a of the female screw portion 8 is friction welded to the end surface of the leading side threaded joint rebar 2. Further, the other surface 8 b of the female screw portion 8 is in contact with the end surface of the joining side screw joint rebar 3. In addition, the code | symbol B4 in FIG. 7 is a burr | flash produced when carrying out the friction welding of the internal thread part 8 to the leading side screw knot rebar 2.

  Next, the procedure of constructing the joint structure 1 according to the third embodiment of the present invention will be described based on FIG. FIG. 9 is a schematic view showing a procedure of constructing the joint structure 1 according to the present embodiment.

  First, as shown in FIG. 9A, a male screw 45 is formed over a predetermined range on one end side of the outer periphery of the cylindrical coupler main body 41.

  Next, as shown in FIG. 9 (b), the female screw 8 is screwed to the male screw 45 to close the opening 42 a opened in the one end face 4 a of the through hole 42, thereby the coupler 4 Is formed in the shape of a bag.

  Next, as shown in FIG. 9 (c), the end face of the leading side threaded joint bar 2 and the one surface 8a of the female screw portion 8 are friction-welded. Specifically, the coupler 4 is rotated at high speed in a state where the outer periphery of the coupler body 41 is gripped, one surface 8a of the female screw 8 is brought into contact with the end surface of the distal end side thread reinforcement 2 and friction heat is generated at the contact portion . Thereafter, the rotation of the coupler 4 is rapidly stopped, and the leading side screw knot rebar 2 is pressed against the female screw portion 8 to join the leading side screw knot rebar 2 and the female screw portion 8.

  Any of the step of screwing the female screw portion 8 to the male screw portion 45 and the step of frictionally pressing the leading side threaded joint rebar 2 on the female screw portion 8 may be first. That is, the female screw 8 may be screwed to the male screw 45 after the leading side threaded rod 2 is friction welded to the female screw 8.

  Next, as shown in FIG. 9 (d), the screw node 3 b of the joining side screw joint rebar 3 is screwed into the node portion 43 of the coupler 4. When inserting the joining side screw joint rebar 3 into the coupler 4, the joining side screw joint rebar 3 in a state where the flat surface 3 a of the joining side screw joint rebar 3 is opposed to the node portion 43 with a gap. Until the tip of the screw contacts the other surface 8 b of the female screw 8. Thereafter, the joint side screw joint rebar 3 is rotated about the axial direction A, and the screw joint 3b of the joint side screw joint rebar 3 and the joint 43 are screwed together. In addition, it is preferable to attach a lock nut (not shown) to the joining side screw joint rebar 3. As a result, by introducing torque into the lock nut, it is possible to securely fix the joining side screw joint rebar 3.

  Thus, in the joint structure 1 according to the present embodiment, the one end of the through hole 42 is closed by the female screw 8 to form the bag-like coupler 4 having the node 43 having a large pitch. Can.

  In addition, since the leading side screw knot rebar 2 is friction welded to the one surface 8a of the female screw portion 8, the work of introducing the torque to the leading side screw knot rebar 2 is omitted. It is possible to simply join the joint side screw joint rebar 3.

  Furthermore, since the torque can be introduced to the joining side threaded joint rebar 3 in a state where the joining side threaded joint rebar 3 is in direct contact with the other surface 8b of the internal thread 8, the leading side threaded joint rebar 2 and the joining side screw The joint bars 3 can be firmly joined.

  The present invention can be modified in various ways without departing from the spirit of the present invention, and it goes without saying that the present invention also extends to those modified.

1 · · · Joint structure 2 · · · Leading side threaded joint rebar 3 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · flat surface 3b (on the side of the joint rod side) Screw bar 4 · · · Coupler 4a · · · (One of the couplers) One end face 4b · · · (The other coupler end face) 41 · · · The coupler body 42 · · · Through hole 43 · · · · · · · · · · · Female screw 45 · · · Male screw 5 · · · Lid (intermediate member)
5a · · · (one side of the lid) 5b · · · (the side of the lid) the other side 51 ... convex portion 6 · · · lock nut 7 · · · Male thread portion (intermediate member)
7a · · · (one side of the male thread) 7b · · · (the other side of the male thread) the other side 8 · · · female thread (intermediate member)
8a · · · (one side of female thread) 8b · · · (the other side of female thread) the other side L ... longitudinal direction

Claims (2)

In the joint structure for connecting and fixing the ends of the leading side threaded joint bars and the joining side threaded joint bars,
A coupler body formed in a tubular shape, a through hole formed from one end face to the other end face in the coupler body, and an inner periphery of the through hole are cut to form the connecting side screw node reinforcing bar A coupler having a screwable joint and an internal thread formed on one end of the through hole ;
A lid portion provided with an external thread portion which is friction welded to the end face of the leading side threaded joint bar and which can be screwed to the internal thread portion, and which closes one end of the through hole of the coupler ;
Joint structure characterized by having. In a method of constructing a joint structure in which the ends of the leading side thread knot rebar and the joining side thread knot rebar are connected and fixed with a coupler,
It has a through hole formed from one end face to the other end face, a node formed by cutting the inner periphery of the through hole, and a female screw formed on one end side of the through hole. Preparing the cylindrical coupler, and a lid portion provided with an external thread portion that can be screwed to the internal thread portion ;
Screwing the female screw portion to the male screw portion to close one end of the through hole with a lid ;
Friction welding the lid to the end face of the leading side threaded joint bar;
Screwing the joint to the joint side screw joint rebar;
A method of constructing a joint structure comprising:

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