JP6430906B2 - Threaded joint for threaded rebar - Google Patents

Description

  The present invention relates to a joint for a threaded reinforcing bar that connects and fixes the ends of two threaded reinforcing bars.

  In order to connect a deformed steel bar, which is a reinforcing material for a concrete structure for civil engineering and construction, a joint that can be screwed into a deformed steel bar (threaded bar) having a flat surface and a screw node formed on the outer periphery is used. When joining threaded joints using such joints, grout is injected into the joint with the ends of adjacent threaded joints inserted in the joint. Integrate rebar.

  Patent Document 1 discloses a coupler in which a screw node that is screwed with a screw node of a screw node reinforcing bar is provided over the entire inner peripheral surface. When joining screw rebars using such a coupler, the gap between the coupler's screw joints and the screw joints of the screw joints is small, so the screw joints are joined so that the coupler can be screwed onto the screw joints. The phase alignment between them was complicated.

  Therefore, in order to easily perform the joining operation of the threaded joints using the joint, a coupler described in Patent Document 2 and a sleeve joint described in Patent Document 3 have been proposed. In the coupler of Patent Document 2, a screw node smaller than that of the coupler is described in Patent Document 1. In such a coupler, since the clearance between the screw joint of the screw joint and the screw joint of the coupler is large, it is possible to join the screw joints without completely matching the pitch of the screw joints. .

  The sleeve joint of Patent Document 3 includes a sleeve main body formed in a cylindrical shape, and a sealing material that is disposed at both ends of the sleeve main body and seals the grout filled in the sleeve main body. This sleeve joint does not include a screw joint that is screwed with a screw joint of the screw joint reinforcing bar, and can easily join the screw joint reinforcing bars by absorbing a pitch shift between the screw joints.

JP-A-60-253650 JP 2002-235404 A JP-A-8-189142

  However, in the coupler described in Patent Document 2 as described above, there is a problem that the fastening force between the coupler screw and the screw joint of the screw joint is weak, and the joint length of the coupler becomes long.

  Further, in the sleeve joint described in Patent Document 3 as described above, since the sleeve joint and the screw joint reinforcing bar are integrated and fixed by the grout, in order to ensure the adhesive force between the sleeve joint and the thread joint reinforcing bar, The joint length of the sleeve joint is longer than that of the coupler described in Patent Document 2. Further, the sleeve joint has a problem that the sleeve main body is enlarged according to the volume of the grout material filled therein.

  Therefore, the present invention has been made in view of such a conventional problem, and provides a joint for a threaded bar which can be simply and firmly joined to each other and can be installed in a small space. Objective.

The present invention has been proposed in order to achieve the above object, and the invention according to claim 1 is a threaded joint for a threaded joint that connects and fixes the ends of two threaded joints. A cylindrical main body that can be fitted to the flat surface of the threaded reinforcing bar so as to be opposed to each other with a gap, and opposed to each other along the axial direction of the main body on the inner peripheral surface of the main body. A screw node comprising: a plurality of nodes formed in two rows; and a recess cut in the inner circumferential surface of the main body in the circumferential direction and disposed only between the nodes in the circumferential direction in plan view. Provide rebar joints.

According to this configuration, the screw joint of the screw joint is slid in the axial direction with respect to the screw joint with the joint of the joint for the joint of the screw joint facing the flat surface of the screw joint. The threaded joint for threaded reinforcing bar can be simply arranged at a desired position without screwing the joint for threaded reinforcing bar relative to the threaded joint. In addition, the threaded bar joint is rotated with respect to the threaded bar and the threaded joint is engaged between the arranged nodes, so that the threaded bar joint and the threaded reinforcing bar are firmly fastened. Therefore, screw joints can be joined to each other with a joint for thread joints having a short joint length. In addition, since the concave portion and the grout solidified in a projecting manner along the shape of the concave portion are engaged, the joint for screw joint and the joint for screw joint are firmly joined. Threaded joints can be joined with joints. Further, the engagement region between the concave portion and the grout solidified in a projecting manner along the shape of the concave portion is formed along the circumferential direction of the main body, so that the joint for the screw joint and the screw joint is axially provided. Since it is strongly joined to the load, the threaded joints can be joined with a joint for threaded joints with a short joint length. And by arranging between the nodes in the circumferential direction in a plan view, the joint for threaded joint and the threaded joint can more strongly resist the axial load of the joint for joint of threaded joint. Therefore, screw joints can be joined with a joint for thread joints with a short joint length.

  In addition to the structure of the joint for threaded joints according to claim 1, the invention according to claim 2 provides a joint for threaded joints in which the sectional shape of the joint along the axial direction is trapezoidal.

  According to this structure, since the clearance between the joint of the joint for threaded joints and the threaded joint of the threaded joint is small, the joint for joints of the threaded joint and the joint of the threaded joint are more firmly fastened. Screw joints can be joined to each other with a joint for joints with thread joints.

According to a third aspect of the present invention, in addition to the configuration of the joint for threaded joints of the first or second aspect, the node is disposed from one end of the main body to a predetermined position, and from the other end of the main body to the predetermined position. Provided is a joint for threaded bar reinforcement, in which a screw node that can be engaged with the threaded bar reinforcement is provided on the inner peripheral surface of the main body.

  According to this configuration, by forming a node in at least a part of the joint for threaded joints, a state in which the joint of the joint for threaded joints and the flat surface of the threaded joint is opposed in the joint formation region The screw joints for screw joints can be easily placed in the desired position by sliding the joints for screw joints while sliding the joints for screw joints in the axial direction. Rotating relative to the reinforcing bars, the threaded joints of the threaded joints are tightly fastened by engaging the threaded joints of the threaded joints between the arranged nodes. Thread joints can be joined to each other with a joint for thread joints.

  The present invention provides a screw joint for a screw joint by fitting a joint for a screw joint in the axial direction with respect to the screw joint with a joint of the joint for a joint and a flat surface of the joint. It is possible to easily arrange the joint for threaded bar at a desired position without screwing the joint with respect to the threaded reinforcing bar. In addition, the threaded bar joint is rotated with respect to the threaded bar and the threaded joint is engaged between the arranged nodes, so that the threaded bar joint and the threaded reinforcing bar are firmly fastened. Therefore, screw joints can be joined to each other with a joint for thread joints having a short joint length.

The side view and partial enlarged view which show the coupling for threaded joints concerning one Example of this invention. (A) is a figure which shows the state before screwing a screw joint and a screw joint, and (b) is a state which screwed together the joint for a screw joint and a screw joint. FIG. (A) is sectional drawing which shows the node of a cross-sectional trapezoid shape, (b) is sectional drawing which shows a cross-sectional triangle-shaped node. The schematic diagram which shows the joining procedure of the screw joint using the joint for screw joints shown in FIG. (A) is the 4A section enlarged view of Fig.4 (a), (b) is the 4B section enlarged view of FIG.4 (b). The table | surface which shows the test result of the elastoplastic area positive / negative repetition test of the joint for threaded joints and the conventional coupler. The schematic diagram which shows the joining procedure of the screw joint using the joint for screw joints which concerns on a modification.

In order to achieve the object of the present invention to provide a joint for screw joints that can be easily and firmly joined to each other and can be installed in a small space, the ends of two thread joints are connected to each other. In the joint for threaded reinforcing bar that connects and secures, the cylindrical main body that can be fitted to the threaded reinforcing bar, and the flat surface of the threaded reinforcing bar are formed so as to be able to face each other with a gap, and the body is formed on the inner peripheral surface of the main body part. A plurality of nodes formed in two rows facing each other along the axial direction of the part, and a recess engraved in the circumferential direction on the inner peripheral surface of the main body and disposed only between the nodes in the circumferential direction in plan view And realized.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a threaded joint 1 for threaded joints according to an embodiment of the present invention will be described with reference to the drawings. In the following examples, when referring to the number, numerical value, quantity, range, etc. of the constituent elements, the specific number is used unless otherwise specified and clearly limited to a specific number in principle. It is not limited, and it may be a specific number or more.

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

  In addition, the drawings may be exaggerated by enlarging characteristic portions in order to make the features easy to understand, and the dimensional ratios and the like of the constituent elements are not always the same. In the cross-sectional view, hatching of some components may be omitted in order to facilitate understanding of the cross-sectional structure of the components.

  FIG. 1 is a side view and a partially enlarged view of a joint 1 for threaded joints as viewed from the axial direction. FIG. 2 is a view showing before and after screw joint 1 for screw joint is screwed onto screw joint 2. FIG. 3 is a longitudinal sectional view of the node 20. The joint 1 for threaded reinforcing bars joins the ends of the threaded reinforcing bars 2 together. The screw joint reinforcing bar 2 is a reinforcing member protruding from the end of the concrete structure for civil engineering construction, and is provided with a flat surface 2a and a screw joint 2b on the outer periphery. Hereinafter, in order to distinguish the screw rebar 2 for the sake of convenience, reference numeral 2 ′ is attached to the preceding male screw rebar to be fitted prior to the threaded joint 1, and the female When reference numerals 2 ″ are attached to the side screw joint reinforcing bars, and these are collectively referred to, only the numerals are used as reference numerals.

  The joint 1 for threaded joints includes a cylindrical main body 10 and a plurality of nodes 20 formed on the inner peripheral surface 11 of the main body 10. A grout injection hole 12 is formed at the center of the main body 10, and a bolt insertion hole 13 is formed at the side of the main body 10.

  The nodes 20 are arranged in rows at predetermined intervals on the inner peripheral surface 11 of the main body 10 along the axial direction A that coincides with the direction perpendicular to the paper surface of FIG. That is, the node 20 is formed such that a protrusion formed spirally on the inner peripheral surface 11 is cut out along the axial direction A. There are two rows of nodes 20 arranged opposite to each other. The inner peripheral flat surface 21 of the joint 20 is formed so as to be able to face the flat surface 2a of the screw joint 2 with a gap c1. Between the nodes 20 and 20 adjacent to each other in the axial direction A, a groove 23 corresponding to the width of the screw node 2b is provided. The joint 20 extends along the circumferential direction B of the main body 10, and the central angle connecting the end 22 of the joint 20 and the center O of the main body 10 is set to 59 °. The end portion 22 of the node 20 is preferably provided with a predetermined gradient, and in this embodiment, a gradient with an inclination angle of 6 ° is provided.

  As shown in FIG. 3A, the node 20 preferably has a substantially trapezoidal cross-sectional area along the axial direction A. Specifically, the lower side length L1 of the node 20 is set to approximately three times the height H. Further, it is preferable that the upper side length L2 of the node 20 is set long within a range where it does not contact the screw node 2b. Note that the node 20 may be a node 20 having a triangular cross section as shown in FIG. In the node 20 having a triangular cross section, the lower side length L1 and the height H are substantially equal, and the upper side length L2 is formed to be equal to or less than half the length of the lower side L1, and the node 20 and the screw node 2b A clearance c2 is secured in between.

  A plurality of recesses 30 are formed on the inner peripheral surface 11 of the main body 10. The recesses 30 are arranged along the axial direction A. The recess 30 is extended along the circumferential direction B of the main body 10. The recess 30 is preferably arranged so as to be continuous or substantially continuous over the circumferential direction B between the opposing nodes 20 when viewed from the side, that is, viewed from the axial direction. In the present embodiment, the recess 30 is formed in a fan shape with a central angle of 100 ° when viewed from the side, and the nodes 20 and the recess 30 are intermittently arranged with a slight gap when viewed from the side.

  Next, a procedure for joining adjacent screw joint reinforcing bars 2 will be described with reference to FIGS. FIG. 4A is a view showing a state in which the threaded joint 1 for the screw joint is inserted into the male threaded joint 2 ′, and FIG. 4B shows the male thread through the joint 1 for the thread joint. FIG. 4 (c) is a diagram showing a state in which the reinforcing bar 2 ′ and the female threaded reinforcing bar 2 ″ are connected, and FIG. 4 (c) shows a state in which the threaded reinforcing bar joint 1 is rotated 90 ° around the axial direction A. FIG. 4D is a diagram showing a state in which the grout 4 is filled in the joint 1 for threaded joints. 5A is an enlarged view of a portion 4A in FIG. 4A, and FIG. 5B is an enlarged view of a portion 4B in FIG. 4B.

  First, as shown in FIGS. 4 (a) and 5 (a), the joint 1 for threaded bar is fitted to the male threaded reinforcing bar 2 '. When fitting the threaded joint 1 for the threaded reinforcing bar to the male threaded reinforcing bar 2 ′, the threaded joint 1 for the threaded reinforcing bar is composed of the flat surface 2a of the male threaded reinforcing bar 2 ′ and the joint 1 for the threaded reinforcing bar. The circumferential flat surface 21 is fitted while being slid to the male screw rebar 2 ′ with a gap c1 therebetween.

  Next, as shown in FIGS. 4B and 5B, the threaded joint 1 for screw joint is slid so as to straddle the male thread joint 2 ′ and the female thread joint 2 ″. The flat surface 2a of the female screw joint reinforcing bar 2 "is positioned to be flush with the flat surface 2a of the male screw joint reinforcing bar 2 '. The threaded reinforcing bar joint 1 is a female threaded reinforcing bar 2 '' with a gap c1 between the flat surface 2a of the female threaded reinforcing bar 2 '' and the inner peripheral flat surface 21 of the threaded reinforcing bar joint 1. Fitted. At this time, by providing a predetermined gradient at the end portion 22 of the node 20, the rotation of the female screw joint reinforcing bar 2 '' can be permitted. Thereafter, the threaded joint 1 for joints is rotated 90 ° around the axial direction A.

  When the joint 1 for threaded joints rotates, as shown in FIG. 4C, the threaded joint 2b engages with the groove 23 between the joints 20 in which the joints 1 for threaded joints are arranged, and the threaded joints. The reinforcing bar joint 1 is fastened to the male threaded reinforcing bar 2 ′ and the female threaded reinforcing bar 2 ″. Further, it is preferable to fix the male screw joint reinforcing bar 2 ′ and the female screw joint reinforcing rod 2 ″ and the screw joint reinforcing bar joint 1 with the fixing bolt 3 inserted through the bolt insertion hole 13.

  4D, the grout 4 is injected into the main body 10 from the grout injection hole 12, and the main body 10 is filled with the grout 4, so that the male screw joint reinforcing bar 2 ′ and the female screw joint are filled. Reinforcing bar 2 '' and threaded joint 1 are integrated. In addition, the grout 4 solidified in a projecting manner in the recess 30 resists the load in the axial direction A by engaging with the recess 30. Further, since the recess 30 is formed between the circumferential directions B of the nodes 20 in a side view, the recess 30 and the grout 4 are strongly engaged against the load in the axial direction A.

  Next, the joint performance of the joint 1 for threaded joints will be described. About the joint 1 for screw joints which has the node 20 of the trapezoidal cross section shown to Fig.3 (a), and the joint 1 for screw joints which has the node 20 of the cross-sectional triangle shape shown in FIG.3 (b) "2015. Edition Technical Reference Manual for Building Structures "(Ministry of Land, Infrastructure, Transport and Tourism, National Institute for Land and Infrastructure Policy Policy, National Institute of Building Science supervised, edited by Editorial Committee for Structural Technical Standards for Buildings, National Gazette Sales Cooperative The results of the elastoplastic region positive / negative repetition test shown in (issued, issued in 2015) are shown in FIGS. FIG. 6A is a diagram showing the joint rigidity and the base material rigidity for each cross-sectional shape of the node 20 at a joint length of 254 mm, and FIG. 6B is a slip for each cross-sectional shape of the node 20 when the joint length is 254 mm. 6 (c) is a view showing the joint rigidity and the base metal rigidity of the joint 20 at a joint length of 310mm, and FIG. 6 (d) is a cross-sectional shape of the joint 20 at a joint length of 310mm. It is a figure which shows the slip amount of every.

  As shown in FIGS. 6 (a) and 6 (b), the joint 1 for a threaded joint having a triangular section 20 has insufficient joint performance at a joint length of 254 mm. It can be seen that the threaded joint 1 for the threaded joint has good joint performance even at a joint length of 254 mm. That is, when the joint length is the same, it can be seen that the joint 1 for threaded bar having the joint 20 having the trapezoidal cross section exhibits better joint performance than the joint 1 for the thread joint having the joint 20 having the triangular section. Further, as shown in FIGS. 6C and 6D, by extending the joint length of the joint 1 for a screw joint having a triangular section 20 to 310 mm, a screw having a trapezoidal section 20 is obtained. It can be seen that the joint performance is good as with the joint 1 for saving bar.

  In this way, the invention according to the present embodiment is configured so that the threaded joint 1 for the screw joint is made into the threaded joint 2 with the joint 20 for the joint 1 for the threaded joint and the flat surface 2a of the joint 2 for the screw facing each other. By fitting, the threaded joint 1 for screw joints can be simply arranged at a desired position without screwing the joint 1 for threaded joints with respect to the threaded joint 2. In addition, the threaded joint 1 for the screw joint is rotated with respect to the joint 2 for the threaded reinforcing bar, and the threaded joint 2 is engaged with the groove 23 of the plurality of joints 20 arranged in a row. Since the rebar 2 is firmly fastened, the screw rebars 2 can be joined to each other with the joint 1 for a screw rebar having a short joint length.

  Next, a procedure for joining adjacent screw joints 2 using the modified example of the joint 1 for screw joints described above will be described with reference to FIG. FIG. 7A is a view showing a state in which the threaded joint 1 for threaded joint is engaged with the male threaded joint 2 '. FIG. 7B is a diagram illustrating a state in which the female-side threaded joint 2 ″ is fitted to the joint 1 for threaded joints. FIG. 7 (c) is a view showing a state where the threaded joint 1 is rotated 90 ° around the axial direction A. FIG.

  In the joint 1 for a threaded reinforcing bar according to this modification, a node 20 is arranged from one end of the main body 10 to the vicinity of the center, and the screw reinforcing bar 2 and the inner peripheral surface 11 of the main body 10 from the other end of the main body 10 to the vicinity of the center. An engageable screw node 40 is provided around. The screw joint 40 has a known configuration, and any screw joint 40 may be used as long as it can be screwed with the screw joint 2b. The nodes 20 and the screw nodes 40 are not limited to those formed from the end of the main body 10 to the vicinity of the center, and depending on the specification of the screw rebar 2, the length of the main body 10, etc. The sizes of the formation region R1 and the formation region R2 of the screw joint 40 may be arbitrarily changed.

  First, as shown in FIG. 7A, the screw node 40 of the joint 1 for screw joint is screwed into the screw joint 2b of the male screw joint 2 '.

  Next, as shown in FIG. 7 (b), the female-side threaded reinforcing bar 2 '' has a flat surface 2a with a clearance c1 between the flat surface 2a and the inner peripheral flat surface 21 of the threaded reinforcing bar joint 1. The inside of the reinforcing bar joint 1 is slid and fitted. Thereafter, the threaded joint 1 for joints is rotated 90 ° around the axial direction A.

  Then, as shown in FIG. 7 (c), the screw joint 2 is engaged with the groove 23 between the plurality of nodes 20, and the screw joint 1 is connected to the male screw joint. Fasten 2 'and female threaded rebar 2' '. Thereafter, the inside of the joint 1 for threaded joints is filled with a grout 4, and the male side threaded joint 2 ′ and female side thread joint 2 ″ and the joint 1 for threaded joint are integrated. Then, if necessary, the male screw joint 2 ′ and the female screw joint 2 ″ and the screw joint 1 are fixed with a fixing bolt or the like.

  In this way, the invention according to the present modification forms the node 20 in at least a part of the joint 1 for threaded joints, so that the joint 20 of the joint 1 for threaded joints is formed in the formation region R1 of the joint 20. The screw joint 1 can be easily placed at a desired position by fitting the screw joint 1 for the screw joint with the screw joint 2 with the flat surface 2a of the screw joint 2 facing each other. At the same time, the threaded joint 1 for the screw joint is rotated with respect to the threaded joint 2 and the threaded joint 2 of the threaded joint 2 is engaged between the joints 20 arranged in a row. And the threaded reinforcing bar 2 are firmly fastened, the threaded reinforcing bars 2 can be joined to each other with the joint 1 for threaded reinforcing bars having a short joint length.

  It should be noted that the present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.

DESCRIPTION OF SYMBOLS 1 ... Joint for screw joints 2, 2 ', 2''... Screw joint 2a ... Flat surface 2b ... Screw joint (of screw joints) 3 ... Fixing bolt 4 Grout 10 ... Main body 11 ... Inner peripheral surface 12 ... Grout injection hole 13 ... Bolt insertion hole 20 ... Node 21 ... Inner peripheral flat surface 22 ... End 23 ... · Groove 30 ··· Recess 40 · · · Screw joint (of the joint for threaded joints) A ... Axial direction B ... Circumferential direction

Claims (3)

In the joint for threaded joints connecting and fixing the ends of two threaded joints,
A cylindrical body that can be fitted to the threaded reinforcing bar,
A plurality of nodes formed in two rows on the inner peripheral surface of the main body portion so as to be opposed to each other along the axial direction of the main body portion;
A concave portion which is engraved in the circumferential direction on the inner circumferential surface of the main body and is disposed only between the nodes in the circumferential direction in plan view;
A joint for threaded reinforcing bars, comprising:   The joint for threaded reinforcing bars according to claim 1, wherein a cross-sectional shape of the node along the axial direction is a trapezoidal shape. The node is disposed from one end of the main body to a predetermined position, and a screw node that can be engaged with the threaded bar is provided on the inner peripheral surface of the main body from the other end of the main body to the predetermined position. The joint for threaded joints of Claim 1 or 2 characterized by these.

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