JP2006022550A - Deformed joint bar anchor and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a deformed joint bar anchor rich in strength against pulling power and shearing force. <P>SOLUTION: The deformed joint bar anchor comprises a concrete reinforcing deformed bar steel B with a certain length L1 and an anchor sleeve A with a certain length L2 making the basic end side as an insertion opening cylinder section 13 to the deformed bar steel B from the same metal material as that of the deformed bar steel B, making the front end side as a widening opening cylinder section 14 to shape into stepped hole shapes or partition blind shapes having different internal diameters d1 and d2 of both opening cylinder sections 13 and 14 and, at the same time, making partially force-fit setting of the widening cone 18 into the widening opening cylinder section 14 to which a widening split groove 17 is given, and in a state to insert and fit the insertion opening cylinder section 13 of the anchor sleeve A in a sleeve-like manner on the front end section of the deformed bar steel B, at least the total of two points collected one by one from the optional centripetal direction make separate resistance welding. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an irregularly shaped bar anchor used for concrete block fence construction work, partitioning work, reinforcing bar civil engineering work, etc., and a method for manufacturing the same.

  The applicant has already proposed Japanese Patent No. 2841189 and Japanese Patent No. 2911036 concerning this kind of deformed difference anchor and its manufacturing method.

  In the former Japanese Patent No. 2841189, the insertion sleeve portion (13) of the anchor sleeve (S) is inserted into the distal end portion of the deformed reinforcing bar (I) and is squeezed so that both of the deformed reinforcing bars (I) are fitted. Formed into a polygon with an even cross-section having two sides (a) and (b) substantially parallel to the diameter line (OO) connecting the longitudinal nodes (11), and into a polygon with an even cross-section. The two parallel side surfaces (a) and (b) of the shaped insertion tube portion (13) are partially continuous at locations corresponding to the adjacent positions of the transverse nodes (12) in the deformed reinforcing bar (I). By caulking, the caulking portion is made to function as a non-slip key (24) (25) for locking the caulking portion to the transverse node (12).

On the other hand, in the latter patent No. 2911036, the base diameter of the anchor sleeve (S) and the tip of the deformed reinforcing bar (I) are connected to each other by using a friction welding machine (F). Friction welding is performed so that the dimension (D3) remains within the outer diameter dimension (D2) of the anchor sleeve (S).
Japanese Patent No. 2841189 Japanese Patent No. 2911036 Japanese Patent Publication No.7-88660

  However, since the invention of the above-mentioned Japanese Patent No. 2841189 is a caulking method in which only the insertion tube portion (13) of the anchor sleeve (S) is physically plastically deformed, the parallel two sides of the polygon with a regular even number of cross-sections. Surfaces (a) and (b) can subsequently be locked to the transverse nodes (12) by spot caulking at locations corresponding to the positions between adjacent ones of the transverse nodes (12) in the deformed reinforcing bar (I). Even if it functions as the non-slip key (24) (25), the height of the transverse node (12) is only about 0.7 to 1.4 mm in the deformed reinforcing bar (I) of D16, for example. Considering it, it is difficult to completely fill and integrate the adjacent mutual gaps by the above-mentioned spot-like caulking, and even if it does not come out, it still has a relative sliding movement and diameter in the axial direction. direction Movement deflection of, there is a risk of causing a backlash.

  Moreover, as a manufacturing method of a deformed difference bar anchor, the transverse node (12) in the deformed reinforcing bar (I) is formed by caulking protrusions (22) and (23) protruding from a pair of caulking dies (20) and (21) facing each other. The position corresponding to each other is determined and pushed, but depending on the position at which the tip of the deformed reinforcing bar (I) is cut, it is laterally moved from the boundary step (15) in the anchor sleeve (S). Since the distance to the node (12) is different from each other and the position corresponding to the adjacent ones of the horizontal node (12) cannot be accurately determined from the outside of the anchor sleeve (S), the caulking is performed. It is also impossible to easily produce a high quality deformed muscle anchor with a stable state.

  In this regard, in the case of the invention of Patent No. 2911036, it can be said that there is no need to prepare the special caulking die (20) (21) as described above, and there is an advantage that the friction welding machine (F) can be used. This is a method in which the base end portion of the anchor sleeve (S) and the tip end portion of the deformed reinforcing bar (I) are friction-welded with each other in a butted state, and the anchor sleeve (S) is inserted into the deformed reinforcing bar (I) and then fitted. Therefore, it is weak against tensile force and shearing force and gives anxiety to the state of use of the deformed muscle anchor.

  Moreover, in order to obtain a complete solid-phase joined state between the anchor sleeve (S) and the deformed reinforcing bar (I), it still takes a long time, and in order to shorten this, the rotational speed and the applied pressure are increased. As a result, the melted burr (23) is greatly overhanged. As a result, the melted burr (23) is removed later, and special pre-processing for the anchor sleeve (S) or the deformed reinforcing bar (I) is performed. It is necessary and still cannot be mass-produced efficiently and inexpensively.

  The present invention aims to improve such a problem, and in order to achieve the object, in claim 1, a deformed steel bar for concrete reinforcement having a certain length,

  From the same type of metal material as the deformed steel bar, the base end side is the insertion tube part to the deformed steel bar and the front end side is the widened tube part, and the stepped hole form or partition where the inner diameters of both the mouth part parts are different Consists of a fixed-length anchor sleeve that is shaped in a blind form and partially press-fitted and set into the above-mentioned expanded opening cylinder portion provided with a split groove for expansion,

  In a state where the insertion tube portion of the anchor sleeve is inserted and fitted into the distal end portion of the deformed steel bar, at least two points in total from each arbitrary centripetal direction are resistance-welded separately.

  In claim 2 dependent on claim 1, in a state where the insertion tube portion of the anchor sleeve is inserted and fitted into the distal end portion of the deformed steel bar, one point from an arbitrary centripetal direction and a crossing with this at a certain angle. It is characterized by resistance welding at least one point from another centripetal direction.

  Further, in claim 3 dependent on claim 1, the insertion tube portion of the anchor sleeve is inserted into the distal end portion of the deformed bar steel by at least two pitches of the nodes in the deformed bar steel,

  It is characterized in that one point from the arbitrary centripetal direction and at least one point from the same centripetal direction at a position separated from the axial direction by a certain distance are resistance-welded.

  In claim 4 which is also dependent on claim 1, the insertion tube portion of the anchor sleeve is inserted into the distal end portion of the deformed bar steel by at least two pitches of the nodes in the deformed bar steel,

  Resistance welding of one point from the arbitrary centripetal direction and at least one point from another centripetal direction that is at a certain distance in the axial direction and intersects the centripetal direction by a certain angle. It is characterized by.

  Further, according to claim 5, which is dependent on claim 1, 2, 3 or 4, at least one of the two points in total is resistance welded to a position corresponding to the rib of the deformed steel bar.

  Similarly, in claim 6, which is dependent on claims 1, 2, 3, 4 or 5, at least two points in total are concentric circles of the deformed steel bar and the anchor sleeve in which the insertion tube portion is inserted and fitted into the tip portion. On the other hand, it is characterized in that resistance welding is performed at a position where the entire radiation symmetrical distribution type is obtained.

  On the other hand, as a manufacturing method of the deformed differential bar anchor, in claim 7, a fixed length of which the inner diameter of the insertion-portion cylinder portion on the proximal end side and the expanded opening cylinder portion on the distal end side are different from each other by plastic working from a round steel material. In addition to the stepped hole shape or the partition blind shape, the expanding cone of the steel ingot acting as a wedge is partially inserted into the expanding cylindrical portion provided with the expanding dividing groove. In the prepared state in which the above-mentioned insertion tube portion of the anchor sleeve press-fitted and set in a state of overhanging is inserted and fitted into the tip of the deformed steel bar for concrete reinforcement,

  The anchor sleeve tube portion of the anchor sleeve is sandwiched and pressed between the frustoconical upper electrode jig of the resistance welder and a flat plate type lower electrode jig wider than this, and is thicker than the insert tube portion. With the base circumferential surface of the deformed steel bar itself as a projection, the welding surface of the upper electrode jig partially concentrated here causes the joint surface between the above-mentioned insertion tube portion and the base circumferential surface to move from the centripetal direction. It is characterized in that welding is integrated at least at a total of two points for each one point.

  Further, according to claim 8 of the manufacturing method, a stepped hole shape having a constant length in which the inner diameter of the insertion tube portion on the proximal end side and the expanded opening tube portion on the distal end side is different by plastic working from a round steel material. Alternatively, the expansion cone of the steel ingot acting as a wedge is press-fitted into a partially overhanging state on the tip side into the above-described expanded cylindrical portion which is shaped in the form of a partition blind and provided with the expansion groove. In the prepared state in which the above-mentioned insertion tube portion of the anchor sleeve was inserted and fitted into the tip of the deformed steel bar for concrete reinforcement,

  The anchor sleeve tube part of the anchor sleeve is sandwiched and pressed between the flat plate type upper electrode jig of the resistance welder and the same flat plate type lower electrode jig, which is thicker than the insertion tube part With the base circumferential surface of the steel bar as a projection, the welding surface of both electrode jigs that are partially concentrated here will cause the joint surface between the insertion tube portion and the base circumferential surface to be at least a total of a pair of facing each other. It is characterized by welding and integration at two points at once.

  According to the above configuration of claim 1, the anchor sleeve is inserted and fitted into the tip of the deformed steel bar and is resistance-welded at least at a total of two points. The anchor sleeve and deformed steel bar do not slide relative to each other in the axial direction, and of course there is no risk of radial wobbling or other backlash. There is an effect of obtaining a deformed muscle anchor excellent in resistance to the above.

  In that case, if the configuration according to claim 2, 3 or 4 is adopted, the resistance welded at least two points in total are separated by a directivity intersecting by a certain angle or / and a certain distance in the axial direction. Due to the positional relationship, the above-mentioned resistance strength as a deformed differential muscle anchor is further improved, and such an effect is also achieved by the configuration of claim 6, which is particularly effective in a thick product.

  Further, if the configuration of claim 5 is adopted, the rib of the deformed steel bar is different from the arc-shaped node protruding from the base circumferential surface, so that the top of the rib is substantially in the form of a straight line extending along the axial direction. Because it has a flat surface, it can easily adhere to the pressurization plane of the electrode jig and the stable rod of the resistance welding machine, and can effectively concentrate the electrode pressure and welding current, and has excellent tensile strength and This has the effect of obtaining a deformed bar anchor with stable welding quality.

  On the other hand, in the manufacturing method according to claim 7, in the prepared state in which the insertion tube portion of the anchor sleeve is inserted and fitted into the distal end portion of the deformed steel bar, this is connected to the frustoconical upper electrode jig of the resistance welder. Also, welding with the upper electrode jig that concentrates on the projection part with the base circumferential surface of the deformed steel bar thicker than the insertion tube part as a projection, sandwiched and pressed by the flat plate type lower electrode jig Since the joint surface between the insertion tube portion and the base circumferential surface is integrated by welding at each of at least two points in total, one point from the centripetal direction, the work piece is welded. Although there is a large difference in the thickness, the welding current value (heat capacity) is an unbalanced deformed steel bar and anchor sleeve, but it is not necessary to stamp out a special projection. The instant it is possible to stably improve integrally welded, the effect capable of producing a superior profile differences muscle anchors.

  In particular, according to the manufacturing method of claim 8, the upper and lower pairs of flat plate-type electrode jigs whose welding current values (heat capacities) are balanced with each other are attached to a resistance welding machine and used, and the insertion sleeve portion of the anchor sleeve is used. The joint surface of the deformed steel bar and the base circumferential surface of the deformed steel bar can be welded and integrated at two points facing each other at the same time by simultaneously punching with both electrode jigs. It is possible to move and / or move a certain distance along the axial direction, and simultaneously weld and integrate two points facing each other at the same time, so the mass production effect of the deformed muscle anchor is further improved .

  Hereinafter, the present invention will be described in detail with reference to the drawings. In FIGS. 1 to 5 showing the first embodiment of the deformed muscle anchor, (B) is cut to a certain length (L1) (for example, about 427 mm). It is a deformed steel bar for concrete reinforcement (for example, SD295A). As the name of JSI standard: D10, it has a diameter (D1) of about 10 mm and a constant height of about 0.6 mm from its base circumferential surface (10) ( Ribs (11) and nodes (12) each projecting by H1).

  In this respect, in the illustrated example, a pair of opposing ribs (11) extending along the axial direction, and a number of nodes (12) intersecting with a constant pitch (P) (about 6.5 mm) between them, Shows a deformed steel bar (B) in a so-called staggered array form, but may be crossed as a lattice array form instead of the staggered array form.

  On the other hand, (A) is a cylindrical anchor sleeve having a constant length (L2) (for example, about 40 mm) and an outer diameter (D2) (for example, about 14 mm). ) (For example, about 17 mm) is a relatively thin wall (for example, about 1.7 mm thick) insertion tube portion (13) into the deformed steel bar (B), and the remaining depth on the tip side is relatively thick. Stepped hole form (communication opening form) in which the inner diameters (d1) and (d2) of the two-end pipes (13) and (14) are different as the wide-opening pipe part (14) having a thickness (for example, about 2.88 mm). Is shaped.

  In other words, the deformed steel bar is such that the inner diameter (d1) (for example, about 10.6 mm) of the insertion tube portion (13) is larger than the inner diameter (d2) (for example, about 8.25 mm) of the enlarged opening tube portion (14). When inserted into the front end of (B) and fitted, the boundary stepped portion (15) in both mouth tube portions (13) and (14) is connected to the front end surface of the deformed steel bar (B) as shown in FIG. It can be locked and function as a stopper.

  However, as long as it becomes a stopper locked to the distal end surface of the deformed steel bar (B), the anchor sleeve (A) is clearly shown in the modified embodiment of FIG. 6 corresponding to FIG. 13) and the enlarged opening cylinder part (14) may be shaped in a blind form in which the boundary wall part (15a) is partitioned and sectioned. The other structure is substantially the same as the anchor sleeve (A) of FIG.

  In that case, in any anchor sleeve (A) of FIGS. 1 and 6, the constant depth (G1) of the insertion tube portion (13) is deformed so that it can be confirmed from the numerical values exemplified above. At least two pitches of the node (12) in the steel bar (B) (about 2.6 pitches in the illustrated example) are dimensioned so that they can be inserted into the deformed steel bar (B) as deeply as possible and can be fitted. It is preferable to prevent relative swinging movement between the sleeve (A) and the deformed steel bar (B).

  (16) is a number of corrugated or serrated concave grooves formed on the outer peripheral surface on the front end side in the thick-walled wide open cylindrical portion (14), and the concrete surface (C ) Eat and praise the anchor effect.

  Further, (17) is an expansion split groove that is similarly cut into the thick expanded cylindrical portion (14) of the anchor sleeve (A) from the tip side by a certain depth (G2) (for example, about 19 mm). They are distributed in a cross-shaped type, a single-character type, and other radial symmetry types as shown in the figure.

  Such an anchor sleeve (A) can be easily mass-produced from a round steel material (for example, SWRCH8 to 10) of the same metal as the deformed steel bar (B) by stepwise cold forging or other plastic working, What is necessary is just to cut the said expansion groove (17) in the final process.

  Further, (18) is a spreading cone having a truncated cone shape of a certain length (L3) (for example, about 23 mm) from the same steel ingot (SWRCH8 to 10) as the anchor sleeve (A). The base end side of a thin (for example, a diameter of about 7.5 mm) is press-fitted and set as a cylindrical press-fit portion (19) so as not to fall off into the above-mentioned expanded cylindrical portion (14) of the anchor sleeve (A). The outer peripheral surface of the press-fitting portion (19) is also formed with an uneven strip (not shown) parallel to the axial direction in order to prevent dropping.

  The widening (for example, about 11 mm in diameter) remaining tip of the expanding cone (18) is set so as to protrude from the expanding cylindrical portion (14) by a certain length (L4) (for example, about 14.6 mm). When the anchor sleeve (A) is relatively moved forward so as to be forcedly immersed in the expanded opening cylinder (14), the split groove (17) of the anchor sleeve (A) As a result, the expanded cylindrical portion (14) having a width expands from the distal end side by the wedge action of the expansion cone (18), and firmly bites into the concrete surface (C).

  In manufacturing the deformed differential bar anchor of the present invention using the anchor sleeve (A) and the deformed steel bar (B) as described above, the anchor sleeve (A ) Is inserted into the restricting state in which the boundary step portion (15) or the boundary wall portion (15a) is engaged with the distal end surface of the deformed steel bar (B), and then arbitrarily fitted. By performing resistance welding one point (S1), (S2), and (S3) one by one from the centripetal direction (F1) (F2) (F3), the insertion tube portion (13) of the anchor sleeve (A) and the deformed steel bar ( The joint surface of B) with the base circumferential surface (10) is welded and integrated at least at a total of two points (S1, S2, S3). (N1), (N2), and (N3) indicate stable nuggets (solidified traces of molten metal) formed separately at at least two places on the joint surface.

  That is, FIG. 7 illustrates a single-phase AC resistance welder (W) for that purpose, and between the upper electrode jig (20) and the lower electrode jig (21) attached thereto, Insert and set the insertion tube portion (13) of the anchor sleeve (A) in a ready state inserted into the tip of the deformed steel bar (B) in advance as shown in FIGS. The electrode jigs (20) and (21) are positioned and held in a laterally stretched state.

  For this purpose, an electrically insulating first and second workpiece (workpiece to be welded) receiving jigs (22) and (23) as suggested in FIGS. (Omitted) mounted on the electrode jigs (20) and (21) so as not to interfere with each other, and the anchor sleeve (A) or its expanding cone (18) is mounted by the first work receiving jig (22). On the other hand, the deformed steel bar (B) held by the second work receiving jig (23) is pressed and urged by the wedge (24) and the compression coil spring (25) in the insertion direction with respect to the anchor sleeve (A). Thus, they are constrained to a positioning and fixing state in which they do not move along the axial direction or do not idle.

  In addition, as long as the front end surface of the deformed steel bar (B) can be locked to the boundary step (15) or the boundary wall (15a) in the anchor sleeve (A) by the pressing biasing force in the insertion direction, the above-mentioned The pressing and urging force may be applied using an air cylinder or an electric cylinder instead of the wedge (24) and the compression coil spring (25).

  Both electrode jigs (20) and (21) are made of copper or copper alloy rich in conductivity, and are attached to and used in a pair of upper and lower electrode jig holders (26) and (27) so as to be detachable and replaceable. The upper electrode jig (20) is moved up and down by the pressure shaft (28) and the pressure cylinder (air cylinder) (29) with respect to the fixed lower electrode jig (21).

  In that case, the upper electrode jig (20) is for spot welding, a narrow pressure plane (30) (preferably a diameter equal to or less than a constant pitch (P) of the nodes (12) in the deformed steel bar (B) ( D3)), the lower electrode jig (21) is a projection plane wider than the upper electrode jig (20) for projection welding, compared to the rod-shaped conical shape. 31) and are in a relationship that causes a significant imbalance in the welding current value (heat capacity).

  Therefore, from the inserted and set state as shown in FIGS. 8 to 10, first, the upper electrode jig (20) that is lowered by the pressure shaft (28) and the pressure cylinder (29) is moved to the fixed state. A pair with a certain lower electrode jig (21) sandwiches the insertion tube portion (13) of the anchor sleeve (A) inserted into the distal end portion of the deformed steel bar (B) and pressurizes strongly to Therefore, a large current is passed instantaneously.

  Then, since the welding current is concentrated at the contact point where the narrow pressing plane (30) of the upper electrode jig (20) presses the insertion tube portion (13) of the anchor sleeve (A), FIG. , 12, the joint surface of the base circumferential surface (10) of the deformed steel bar (B) and the insertion tube portion (13) of the anchor sleeve (A) is welded and integrated, and the insertion tube portion ( As a result, only one point (S1) of the concave pressurization trace which is struck once from the centripetal direction (F1) of the upper electrode jig (20) is exposed on the outer peripheral surface of 13).

  That is, the base circumferential surface (10) itself of the deformed steel bar (B), which is thicker than the insertion tube portion (13) of the anchor sleeve (A), functions as a partial projection. Since the pressing force and the welding current of the upper electrode jig (20) concentrate from the centripetal direction (F1), a stable nugget (N1) is formed at one place on the joint surface.

  On the other hand, the welding current is effectively concentrated at the contact point where the vast pressure plane (31) of the lower electrode jig (21) presses the insertion tube portion (13) of the anchor sleeve (A). Without generating a stable nugget on the joint surface with the base circumferential surface (10) of the deformed steel bar (B), the shunting / diffusion of the deformed steel bar (B) occurs. A strong welded state that can withstand use cannot be obtained. The concave pressurization trace by the lower electrode jig (21) does not appear on the outer peripheral surface of the insertion tube portion (13).

  Therefore, as a first time, the deformed difference muscle anchor in which the one point (S1) is resistance-welded from an arbitrary centripetal direction (F1) is continuously applied at a constant angle (α) as shown in FIGS. And the insertion sleeve portion (13) of the anchor sleeve (A) is sandwiched between a pair of the upper electrode jig (20) and the lower electrode jig (21), and the first time The base circumferential surface (10) in the deformed steel bar (B) by the pressure and welding current of the upper electrode jig (20) concentrated from another centripetal direction (F2) intersecting with the centripetal direction (F1) at The welding surfaces are welded and integrated. (N2) is a stable nugget formed on the joint surface as a separate one in the second time, and (S2) is an upper electrode that is also exposed on the outer peripheral surface of the insertion tube portion (13) The concave pressurization trace in a jig | tool (20) is shown.

  As the second time, the deformed bar anchor with resistance welding at the above point (S2) is rotated again in the same direction by a fixed angle (α) (about 120 degrees in the example) as shown in FIGS. Further, another centripetal crossing with the centripetal direction (F2) at the second time is also performed by sandwiching the insertion tube portion (13) of the anchor sleeve (A) by the pair of upper and lower electrode jigs (20) and (21). The joining surface of the deformed steel bar (B) with the base circumferential surface (10) is welded and integrated by the applied pressure and welding current of the upper electrode jig (20) concentrated from the direction (F3). (N3) is a stable nugget formed on the joint surface as another one place in the third time, and (S3) is an upper electrode jig (20 ) In the concave pressurization trace.

  By such first to third resistance welding, the joint surface between the insertion tube portion (13) of the anchor sleeve (A) and the base circumferential surface (10) of the deformed steel bar (B) has an arbitrary centripetal effect. From the directions (F1), (F2), and (F3), the deformed differential muscle anchors welded and integrated at a total of three points (S1), (S2), and (S3), each at one point (S1) (S2) (S3) 3 to 5 show a first embodiment of the present invention.

  In that case, in relation to the both electrode jigs (20) and (21) in the resistance welder (W), no matter what direction the rib (11) of the deformed steel bar (B) is, 12), the welded state of the joint surface can be achieved without any problem. However, as shown in FIGS. 3 and 4, any of the above three points (S1), (S2), and (S3) One point (S1) can be resistance-welded to the insertion tube portion (13) of the anchor sleeve (A) on the rib (11) protruding from the base circumferential surface (10) of the deformed steel bar (B). preferable.

  Moreover, as apparent from FIG. 5, with respect to the substantially concentric circle of the deformed steel bar (B) and the anchor sleeve (A) in which the insertion tube portion (13) is inserted and fitted to the tip portion thereof, It is desirable that the total three points (S1), (S2), and (S3) be resistance-welded to a position that is an overall radial symmetric distribution type.

  Then, even if the insertion tube portion (13) of the anchor sleeve (A) is inserted and fitted into the tip of the deformed steel bar (B), the arrangement of the ribs (11) in the deformed steel bar (B) Since the shape is different from that of the node (12) and can be seen at a glance from the outside of the anchor sleeve (A), both the electrodes are set when inserted into the first and second work receiving jigs (22) and (23). This is because the clamping pressure position by the jigs (20) and (21) can be accurately determined, and the rotation operation of the constant angle (α) can be easily performed correctly using this as a positioning reference.

  Unlike the arc-shaped node (12) protruding from the base circumferential surface (10), the rib (11) of the deformed steel bar (B) has a substantially linear shape extending so as to extend along the axial direction. In particular, the flat surface of the upper electrode jig (20) tends to be in close contact with the narrow pressure plane (30) and the stable rod, and the pressure and welding current of the upper electrode jig (20) can be reduced. It is possible to concentrate at a high density without any loss on the joint surface, and due to its effective thermal expansion action, the welded state at a total of three points (S1), (S2), and (S3) forming an overall radial symmetry distribution type This is because the deformed muscle anchor having excellent tensile strength can be obtained.

  Incidentally, in manufacturing the deformed bar anchor of the first embodiment from the anchor sleeve (A) and the deformed steel bar (B) having the numerical values exemplified above, the rated capacity as shown in FIG. Pressure: 1,000Kgf, 30,000A single-phase AC resistance welding machine (W) is used, and the above-mentioned narrow pressure plane (30) truncated conical upper electrode jig (20) and wide A flat plate type lower electrode jig (21) having a flat pressing surface (31) is attached, air pressure: 3.5 kg / cm (about 700 kgf), energization time: 25 cycles, welding current: 16,800 A Basically, as a result of the first to third resistance welding, a deformed bar anchor having a tensile strength of about 4.8 tons could be obtained.

  Next, FIGS. 17 and 18 show a second embodiment of the present invention corresponding to FIGS. 4 and 5, and a deformed bar anchor made of an anchor sleeve (A) and a deformed steel bar (B) having the same numerical values as the first embodiment. However, in this case, the joint surface between the insertion tube portion (13) of the anchor sleeve (A) and the base circumferential surface (10) of the deformed steel bar (B) is formed by first and second resistance welding. From the opposing centripetal directions (F1) and (F2), welding is integrated at a total of two points (S1) and (S2), each one point (S1) and (S2).

  That is, the insertion tube portion (13) of the anchor sleeve (A) inserted and fitted into the tip end of the deformed steel bar (B) is also connected to the upper electrode jig (20) and the lower side as shown in FIGS. Due to the welding current that is sandwiched between the electrode jig (21) and the narrow pressure plane (30) of the upper electrode jig (20) concentrates on the contact that pressurizes the insertion tube portion (13), the deformed steel bar ( The joint surface with the base circumferential surface (10) in B) is welded and integrated in advance by one point (S1) from the centripetal direction (F1) of the upper electrode jig (20). (N1) is a stable nugget formed at one place on the joint surface.

  In this case, as shown in FIGS. 19 and 20, the lower electrode jig (21) has an arcuate pressure concave surface (31a) corresponding to the insertion tube portion (13) of the anchor sleeve (A). A notched flat plate type can also be used, and the pressure concave surface (31a) is also larger than the pressure plane (30) of the upper electrode jig (20), and the welding current value ( On the contact point that pressurizes the insertion tube portion (13), the welding current is not effectively concentrated on the contact point that pressurizes the insertion tube portion (13) due to the correlation that causes the unbalance of the heat capacity), A stable and strong nugget that can withstand use as a deformed differential muscle anchor is not formed.

  Therefore, as a first round, the deformed bar anchor in which one point (S1) is resistance-welded from the centripetal direction (F1) in the upper electrode jig (20), and then a fixed angle (β) as shown in FIGS. (In the example shown, about 180 degrees), the insertion tube portion (13) of the anchor sleeve (A) is also sandwiched between a pair of upper and lower electrode jigs (20) and (21), and centripetal in the first time. Due to the applied pressure and welding current of the upper electrode jig (20) concentrated from the centripetal direction (F2) different from the direction (F1), the joint surface with the base circumferential surface (10) of the deformed steel bar (B) It is welded and integrated. (N2) shows a stable nugget formed on the joint surface as another one place in the second round. As a result of performing the first and second rounds of resistance welding on the flange, the insertion tube On the outer peripheral surface of the portion (13), concave pressurization traces on the upper electrode jig (20) are exposed as two facing points (S1) and (S2).

  In the manufacture of the deformed bar anchor according to the second embodiment, the resistance welding machine (W) of FIG. 7 also has an upper electrode jig (20) having a narrow pressing plane (30) and a large pressing concave surface ( 31a) A flat plate type lower electrode jig (21) with a notch is attached and used, and under the same welding conditions such as air pressure, energization time, welding current and the like as in the first embodiment, As a result of resistance welding of each of the two points (S1) and (S2) at the opposite positions corresponding to the rib (11) of the deformed steel bar (B), the tensile strength is about 1 4.5 tons of deformed muscle anchors could be obtained.

  23 to 25 show, as a third embodiment of the present invention corresponding to FIGS. 3 to 5, a deformed bar anchor made of an anchor sleeve (A) and a deformed steel bar (B) having the same numerical values as the first embodiment. In this case, the insertion tube (13) of the anchor sleeve (A) is inserted deeply into the tip of the deformed steel bar (B) by about 2.6 pitches of the node (12) in the deformed steel bar (B). It is in a fitted state.

  Then, an arbitrary centripetal direction in the upper electrode jig (20) is first formed on the joint surface between the insertion tube portion (13) of the anchor sleeve (A) and the base circumferential surface (10) of the deformed steel bar (B). After welding and integration at one point (S1) from (F1), the deformed differential anchor is temporarily moved along the axial direction by a fixed distance (Y), and then the upper electrode jig from the same centripetal direction (F2) According to (20), welding is integrated at a separate point (S2) at a position separated from the previous point (S1). Therefore, a total of two points (S1) and (S2) resistance-welded separately for the first and second times are distributed in a parallel state on the same axis.

  In this case, regardless of the order of the first and second welding, the moving distance (Y) along the axial direction can be selected to an arbitrary value regardless of the pitch of the node (12), and the centripetal direction (F1). It is sufficient to designate (F2) as an arbitrary direction unrelated to the rib (11), but as suggested from FIGS. 23 and 24 in particular, the above-mentioned two points (S1) and (S2) are both shaped steel bars. It is desirable that the position corresponding to the rib (11) in (B) is resistance-welded separately, and the moving distance (Y) is set to a value substantially equal to the constant pitch (P) of the node (12). This is because by forming the more stable nuggets (N1) and (N2), it is possible to manufacture a deformed differential muscle anchor having excellent tensile strength.

  FIGS. 26 to 29 show a fourth embodiment of the present invention corresponding to FIGS. 3 to 5. In this deformed difference bar anchor, the insertion tube portion (13) of the anchor sleeve (A) has a deformed bar ( The tip end of B) is also inserted deeply by about 2.6 pitches of the node (12) in the deformed steel bar (B).

  And, according to the manufacturing method of the second embodiment, the joint surface between the insertion tube portion (13) of the anchor sleeve (A) and the base circumferential surface (10) of the deformed steel bar (B), As the second resistance welding, from the centripetal direction (F1) (F2) crossed by a certain angle (β) (about 180 degrees in the example) by the upper electrode jig (20), one point (S1) (S2) facing each other ) After a total of two points (S1) and (S2), each of them is welded and integrated one after another, and then the deformed differential muscle anchor is once moved along the axial direction by a fixed distance (Y), and a fixed angle (γ) (About 90 degrees in the example of the figure) by rotating each step, the centripetal direction (F1) (F2) by the upper electrode jig (20) in the first and second times as the third and fourth resistance welding Crossed centripetal direction (F3) (F4), opposite A total of two points (S3) and (S4) of one point (S3) and (S4) are welded and integrated sequentially.

  According to this, as a result of performing each of the first to fourth resistance weldings, the outer peripheral surface of the insertion tube portion (13) in the anchor sleeve (A) has a concave shape in the upper electrode jig (20). The pressurization traces are expressed as a total of four points (S1), (S2), (S3), and (S4) that are almost perpendicular to each other at two points (S1), (S2), (S3), and (S4) that face each other. Stable nuggets (N1) (N2) (N3) (N4) corresponding to these are formed at a total of four locations.

  At that time, as is apparent from FIGS. 26 and 27, the total two points (S1) and (S2) facing each other in the first and second times are individually resistance welded onto the rib (11) of the deformed steel bar (B), The movement distance (Y) along the axial direction is set to a value substantially equal to the constant pitch (P) of the node (12), and a total of two points (S3) and (S4) facing each other at the third and fourth times are set to the node ( 12) It is preferable to resistance-weld each other to each other. This is because a deformed muscle anchor having an improved tensile strength can be obtained. However, the welding order of the first to fourth times is not limited and can be freely determined in consideration of workability.

  Further, FIGS. 30 and 31 show a fifth embodiment of the present invention corresponding to FIGS. 3 and 5, and a deformed bar anchor made of an anchor sleeve (A) and a deformed steel bar (B) having the same numerical values as those of the first embodiment. However, in this case, unlike the first to fourth embodiments, the joint surface between the insertion tube portion (13) of the anchor sleeve (A) and the base circumferential surface (10) of the deformed steel bar (B). Are simultaneously integrated at two points (S1) and (S2) from the opposing centripetal directions (F1) and (F2) of the two electrode jigs (20) and (21).

  That is, as suggested by the single-phase AC resistance welding machine (W) of FIG. 32 corresponding to FIG. 7, a pair of upper and lower electrode jig holders (platens) (26) (27) in the welding machine (W). In other words, a pair of upper and lower flat plate-type electrode jigs (20) and (21) having the same large pressure planes (30) and (31) for projection welding are attached and used.

  Then, a deformed steel bar (20), which is also lowered by the pressure shaft (28) and the pressure cylinder (29), and a pair of the lower electrode jig (21) in a fixed state, A large current is passed instantly while the insertion tube portion (13) of the anchor sleeve (A) inserted and fitted into the distal end portion of B) is sandwiched as shown in FIGS. 33 to 35 and pressed strongly. .

  If it does so, since a pair of upper and lower electrode jigs (20) (21) is a flat plate type provided with vast pressure planes (30) (31), the insertion tube portion (13) of the anchor sleeve (A) ) Is plastically deformed into an almost elliptical shape as shown in FIGS. 34 and 35, and the concave pressurization traces of the two electrode jigs (20) and (21) do not appear on the outer peripheral surface thereof, but face each other. Only a total of two points (S1) and (S2) are flat.

  Further, when compared with the upper electrode jig (20) rod-shaped in a frustoconical shape for so-called spot welding in the first to fourth embodiments, the flat plate type of both electrode jigs (20) ( 21) Even if it cannot be denied that the welding current is not concentrated and distributed to some extent at the two contacts that pressurize the insertion tube portion (13) of the anchor sleeve (A), the welding current value (heat capacity) ) Is balanced between the upper and lower sides of both electrode jigs (20) and (21), so that the insertion tube portion (13) of the anchor sleeve (A) and the base circumferential surface (10) of the deformed steel bar (B). Can be welded and integrated at the same time without any trouble at a total of two points (S1) and (S2) from the facing centripetal directions (F1) and (F2). (N1) and (N2) indicate stable nuggets formed on the joint surface by one-stroke of the electrode jigs (20) and (21).

  Even in the manufacturing method of the fifth embodiment, the base circumferential surface (10) itself of the deformed steel bar (B) that is thicker than the insertion tube portion (13) of the anchor sleeve (A) is also a part. Stable nugget (N1) because the applied force and welding current of both electrode jigs (20) and (21) concentrate in a balanced manner from the centripetal direction (F1) (F2) facing the projection part. (N2) can be formed simultaneously.

  Incidentally, when manufacturing the deformed bar anchor of the fifth embodiment from the anchor sleeve (A) and the deformed steel bar (B) having the same numerical values as the first embodiment, the rated capacity as shown in FIG. 32: 75 KVA, Maximum pressing force: 1,000 Kgf, using a 30,000 A single-phase AC resistance welder (W), air pressing force: 3,5 Kg / cm (about 700 Kgf), energizing time: 25 cycles, welding current: A total of two points (S1) and (S2) at the opposite positions corresponding to the ribs (11) of the deformed steel bar (B) under the condition of 16,800A, with both electrode jigs (20) and (21). As a result of resistance welding by simultaneous one-time punching, a deformed bar anchor having a tensile strength of about 4.1 tons and withstanding sufficient use could be obtained.

  In addition, since the other structure in 2nd-5th Embodiment is substantially the same as the said 1st Embodiment of FIGS. 1-16, the corresponding code | symbol with FIG. The detailed description will be omitted. Also in the fifth embodiment, two points (S1) and (S2) from the centripetal directions (F1) and (F2) facing each other are resistance welded at the same time, and then the deformed muscle anchor is, for example, about 90 according to the manufacturing method of the second embodiment. It is possible to keep the welded state at a total of four points by turning the two points at the same time from the centripetal direction facing each other at the second time, and turning at the same time.

  In any of the first to fifth embodiments, the deformed steel bar (B) and the anchor sleeve (A) used in combination for producing the deformed bar anchor of the present invention have a large difference in thickness. According to conventional common sense, a method of resistance welding these cannot be conceived at all because of a significant unbalance in the heat capacity (welding current value).

  However, according to the test results of the first, second and fifth embodiments, the insertion tube portion (13) of the anchor sleeve (A) and the deformed steel bar (B) are in a substantially concentric circle fitting state. The base circumferential surface (10) of the deformed steel bar (B) forming the thick wall side itself functions as a partial projection, and the addition of both electrode jigs (20) (21) concentrated on this portion is performed. In addition to maintaining the contact state of the anchor sleeve (A) with the insertion tube section (13) at high density, the welding current concentrated on the projection portion also forms the insertion tube of the anchor sleeve (A) on the thin side. Effectively balanced with the portion (13), the projection portion is softened and crushed as the energization time elapses, and a stable nugget (N1) (N2) is formed on the joint surface with the insertion tube portion (13). (N3) (N4 Since that will form the believed that could be without hindrance resistance welding the anchor sleeve (A) and profiled bars (B).

  In that sense, it may be said that resistance welding is called projection welding, but in the case of the present invention, unlike the conventional projection welding, the workpiece on the thin side (thick plate) is changed from the workpiece on the thick side (thin plate). In the first to fourth embodiments, there is no need to specially project the projection toward the outer peripheral surface of the insertion tube portion (13) in the anchor sleeve (A). Since the concave pressurization trace by the jig (20) appears, it corresponds to spot welding rather than projection welding. However, only in the case of the fifth embodiment, since the concave pressurization trace does not appear, it can be said that it is closer to projection welding in that sense.

  More specifically, the deformed steel bar (B) and the insertion tube portion (13) of the anchor sleeve (A) inserted into the tip of the steel bar form a substantially concentric circle. Even if the diameter (D1) of the steel plate changes in size, the heat capacity (welding current value) does not become unbalanced, and is kept in a substantially constant balance at all times. Therefore, the same resistance welding machine as shown in FIGS. (W) and electrode jigs (20) and (21), and with the same air pressure, energization time, welding current and other welding conditions, the deformed steel bar (B) having a different diameter (D1) and Various deformed muscle anchors composed of the anchor sleeve (A) can be manufactured without hindrance.

  That is, in each of the first to fifth embodiments, the JIS standard name: D10 deformed steel bar (B) and the correspondingly shaped differential anchor anchor composed of the cylindrical anchor sleeve (A) of the corresponding thickness are representative examples. JIS standard name: D13 and D16 deformed steel bar (B) and the corresponding difference thickness anchor anchor (A) of the corresponding thickness sleeve, This means that the present invention can be applied.

  In addition, the insertion tube portion (13) of the anchor sleeve (A) is inserted into the distal end portion of the deformed steel bar (B), and the first portion of the resistance welder (W) is inserted in such a prepared state. As described above, the work of inserting and setting into the two workpiece receiving jigs (22) and (23) has been described above. However, as the work order, only the anchor sleeve (A) is used first and the first and second workpiece receiving jigs (22) and (23). ) And set in a fixed position, and then insert the end of the deformed steel bar (B) into the insertion tube (13) of the anchor sleeve (A) by hand or automatic mechanical force. It is okay to put it on.

  The deformed bar anchor of the present invention manufactured as described above is, for example, an anchor sleeve (A) to an embedding hole (32) processed by a drill in a concrete surface (C) in construction work of a concrete block fence. Is inserted and used as a buried state as shown in FIG.

  Then, the deformed steel bar (B) exposed from the concrete surface (C) is driven by a hammering tool (33) such as a hammer, and the expansion is stopped and restrained by the bottom of the embedded hole (32). Since the anchor sleeve (A) integrated with the deformed steel bar (B) moves forward relative to the opening cone (18), the anchor sleeve (A) is expanded and deformed from the tip side as shown in FIG. Thus, the concrete block (C) is bitten and fixed so as not to be detached, thereby forming a strong skeleton of the concrete block wall.

  In that case, the anchor sleeve (A) is inserted and fitted into the tip of the deformed bar (B), and is resistance-welded to the deformed bar (B) at the insertion tube (13). The tapping force in the process may not be applied correctly along the axial direction of the deformed steel bar (B), or it may be repeatedly subjected to shearing force such as wind pressure from the radial direction during use as a reinforcing skeleton for concrete block fences. However, there is no possibility of causing a relative swinging motion between the anchor sleeve (A) and the deformed steel bar (B), and there is no possibility that the anchor sleeve slides or comes off along the axial direction.

1 is an exploded side view of an anchor sleeve and a deformed steel bar showing a first embodiment of a deformed bar anchor according to the present invention. FIG. 2 is a sectional view taken along line 2-2 of FIG. It is a top view which shows the deformed difference muscle anchor of FIG. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. It is an expanded sectional view which follows the 5-5 line of FIG. It is a half notched cross-sectional view showing a modified embodiment of the anchor sleeve. It is a side view which shows the resistance welding machine used for manufacture of 1st Embodiment. It is a side view which shows the welding preparation state of an anchor sleeve and a deformed steel bar. It is a top view of FIG. It is an expanded sectional view which follows the 10-10 line of FIG. It is a sectional side view which shows the 1st welding process of an anchor sleeve and a deformed steel bar. It is an expanded sectional view which follows the 12-12 line of FIG. FIG. 13 is a cross-sectional view of a state in which the deformed muscle anchor is rotated by a certain angle from FIG. 12. It is sectional drawing which shows the 2nd welding process. FIG. 15 is a cross-sectional view showing a state where the deformed muscle anchor is further rotated by a certain angle from FIG. 14. It is sectional drawing which shows the 3rd welding process. It is a sectional side view which shows 2nd Embodiment of the odd-shaped difference muscle anchor which concerns on this invention. It is an expanded sectional view which follows the 18-18 line of FIG. It is sectional drawing which shows the welding preparation state of the anchor sleeve and deformed steel bar in 2nd Embodiment. It is sectional drawing which shows the 1st welding process. FIG. 21 is a cross-sectional view of a state in which the deformed difference muscle anchor is rotated by a certain angle from FIG. 20. It is sectional drawing which shows the 2nd welding process. It is a top view which shows 3rd Embodiment of the odd-shaped difference muscle anchor which concerns on this invention. FIG. 24 is a cross-sectional view taken along line 24-24 in FIG. It is an expanded sectional view which follows the 25-25 line of FIG. It is a top view which shows 4th Embodiment of the odd-shaped difference muscle anchor which concerns on this invention. FIG. 27 is a sectional view taken along line 27-27 in FIG. 26. FIG. 28 is an enlarged sectional view taken along line 28-28 in FIG. 27. FIG. 29 is an enlarged sectional view taken along line 29-29 in FIG. 27. It is a top view which shows 5th Embodiment of the odd-shaped difference muscle anchor which concerns on this invention. It is an expanded sectional view which follows the 31-31 line of FIG. It is a side view which shows the resistance welding machine used for manufacture of 5th Embodiment. It is sectional drawing which shows the welding preparation state of the anchor sleeve and deformed steel bar in 5th Embodiment. FIG. 34 is a side sectional view showing a simultaneous one-time welding process from FIG. 33. It is an expanded sectional view which follows the 35-35 line | wire of FIG. It is explanatory drawing which shows the embedding use process of a deformed difference muscle anchor. FIG. 37 is an explanatory diagram showing an embedded state after FIG. 36.

Explanation of symbols

(10) · Base circumferential surface (11) · Rib (12) · Node (13) · Insertion tube portion (14) · Expanded tube portion (15) · Boundary step portion (15a) · Boundary wall portion (17 ) ・ Expansion split groove (18) ・ Expansion cone (19) ・ Press-fit part (20) (21) ・ Electrode jig (22) ・ (23) ・ Work receiving jig (26) (27) ・Electrode jig holder (platen)
(28) ・ Pressure shaft (29) ・ Pressure cylinder (30) (31) (31a) ・ Pressure plane (A) ・ Anchor sleeve (B) ・ Deformed bar steel (C) ・ Concrete surface (W) ・ Resistance Welding machine (Y), travel distance (S1) (S2) (S3) (S4), concave pressurization trace (N1) (N2) (N3) (N4), nugget (α) (β) (γ), times Moving angle

Claims (8)

A deformed steel bar for concrete reinforcement of a certain length;
From the same type of metal material as the deformed steel bar, the base end side is the insertion tube part to the deformed steel bar and the front end side is the widened tube part, and the stepped hole form or partition where the inner diameters of both the mouth part parts are different Consists of a fixed-length anchor sleeve that is shaped in a blind form and partially press-fitted and set into the above-mentioned expanded opening cylinder portion provided with a split groove for expansion,
In the state in which the insertion tube portion of the anchor sleeve is inserted into the distal end portion of the deformed steel bar and is fitted and fitted, at least two points one by one from the arbitrary centripetal direction are resistance welded separately. Difference muscle anchor.   In a state in which the insertion tube portion of the anchor sleeve is inserted into the distal end portion of the deformed steel bar, one point from the arbitrary centripetal direction and at least one point from another centripetal direction that intersects with this by a certain angle The deformed bar anchor according to claim 1, which is resistance welded. The anchor sleeve insertion tube is inserted into the distal end of the deformed steel bar by at least two pitches of the nodes in the deformed steel bar,
The deformed differential muscle anchor according to claim 1, wherein one point from the arbitrary centripetal direction and at least one point from the same centripetal direction at a position separated from the axial direction by a certain distance are resistance-welded. The anchor sleeve insertion tube is inserted into the distal end of the deformed steel bar by at least two pitches of the nodes in the deformed steel bar,
Resistance welding of one point from the arbitrary centripetal direction and at least one point from another centripetal direction that is at a certain distance in the axial direction and intersects the centripetal direction by a certain angle. The deformed muscle anchor according to claim 1.   5. The deformed bar anchor according to claim 1, wherein at least one of the two points is resistance-welded to a position corresponding to the rib of the deformed steel bar.   At least two points in total were resistance welded to the position of the overall radial symmetric distribution type with respect to the concentric circle of the deformed steel bar and the anchor sleeve in which the insertion tube portion was inserted and fitted to the tip. The deformed muscle anchor according to claim 1, 2, 3, 4 or 5. By plastic working from a round steel material, the proximal end side insertion tube portion and the distal end side expanded opening tube portion are shaped into a stepped hole shape or a partition blind shape of a certain length with different inner diameters, The insertion tube portion of the anchor sleeve in which the expanding cone of the steel ingot acting as a wedge is press-fitted and set in a partially projecting state on the tip side into the expanding tube portion provided with the expansion groove. In the ready state that was inserted into the tip of the deformed steel bar for concrete reinforcement,
The anchor sleeve tube portion of the anchor sleeve is sandwiched and pressed between the frustoconical upper electrode jig of the resistance welder and a flat plate type lower electrode jig wider than this, and is thicker than the insert tube portion. With the base circumferential surface of the deformed steel bar itself as a projection, the welding surface of the upper electrode jig partially concentrated here causes the joint surface between the above-mentioned insertion tube portion and the base circumferential surface to move from the centripetal direction. A method for producing a deformed difference muscle anchor, characterized in that welding is integrated at least at a total of two points for each one point. By plastic working from a round steel material, the proximal end side insertion tube portion and the distal end side expanded opening tube portion are shaped into a stepped hole shape or a partition blind shape of a certain length with different inner diameters, The insertion tube portion of the anchor sleeve in which the expanding cone of the steel ingot acting as a wedge is press-fitted and set in a partially projecting state on the tip side into the expanding tube portion provided with the expansion groove. In the ready state that was inserted into the tip of the deformed steel bar for concrete reinforcement,
The anchor sleeve tube part of the anchor sleeve is sandwiched and pressed between the flat plate type upper electrode jig of the resistance welder and the same flat plate type lower electrode jig, which is thicker than the insertion tube part With the base circumferential surface of the steel bar as a projection, the welding surface of both electrode jigs that are partially concentrated here will cause the joint surface between the insertion tube portion and the base circumferential surface to be at least a total of a pair of facing each other. A method for producing a deformed difference anchor, characterized in that welding is integrated simultaneously at two points.

Images