JP6512687B2 - Method and apparatus for manufacturing fixing bar with reinforcing member - Google Patents

Description

  The present invention relates to a method and an apparatus for manufacturing a reinforcing bar with a fixing body, and more particularly to a method and an apparatus for manufacturing a reinforcing bar having a fixing body for improving the fixing property to concrete formed at an end.

  In concrete structures that use rebars, in order to improve the fixability of rebars to concrete and to obtain the required compressive strength, tensile strength, etc., form an enlarged diameter structure called fixing body at the end (one or both ends) Rebar (hereinafter referred to as rebar with fixing body) is used. For example, as shown in FIG. 4A, the end of the reinforcing bar (column bar) 3 of the concrete column 1 is made to enter the concrete beam (or foundation) 2 and the fixing body 5 at the end is made the reinforcing bar of the beam 2 (beam Streak to 3). Further, as shown in FIG. 4B, the end of the reinforcing bar (beam bar) 3 of the concrete beam 2 is made to enter the concrete column 1, and the fixing body 5 of the end is made to the reinforcing bar (beam bar) 3 of the column 1. Fix it. By securing a sufficient fixing performance for the reinforcing bars 3 of the columns 1 and the beams 2 by means of the fixing body 5, it is possible to give the concrete structure the required anti-fatigue performance, earthquake resistance and the like. In addition, not only at the time of construction of a new concrete structure, the reinforcing bar 3 with the fixing body 5 is also used in seismic reinforcement of an existing concrete structure and the like (see Patent Document 1).

  The fixing member 5 at the end of the reinforcing bar 3 can be formed, for example, by bending the end of the reinforcing bar 3 into a U-shape or an L-shape as shown in FIG. 4 (C). However, the method of bending the end portion is time-consuming, and the diameter of bending is relatively large, so that the fixing operation in a narrow place is difficult. For this reason, as shown in FIG. 4D, for example, a method of friction-welding a lithographic fixing member (for example, metal plate) 5b to the end of rebar 3 in a direction intersecting the rebar central axis, or the end of rebar 3 The method etc. of forming the fixing body 5b diameter-expanded by the process which heats a part and squeeze (hot upsetting process) are proposed (refer patent document 2, patent document 3). FIG. 4E shows the reinforcing bar 3 in which the fixing members 5b and 5c are formed at both ends by these methods.

  Further, as shown in FIG. 4F, the end portion of the reinforcing bar 3 is formed into a male screw (or female screw) shape, and the inner peripheral surface of the fixing cap 6 having the annular ridge 5d on the outer wall is female screw (or A method has also been proposed in which the fixing cap 6 is formed by screwing the fixing cap 6 onto the end of the reinforcing bar 3 (see Patent Document 4). In this case, the annular ridge 5d of the outer wall surface of the fixing cap 6 fitted to the end of the reinforcing bar 3 functions as a fixing body. The code | symbol 7 in a figure shows the adhesive agent interposed between the edge part peripheral surface of the rebar 3, and the internal peripheral surface of the fixing cap 6. As shown in FIG. Further, as shown in FIG. 4 (G), a cut 8 in the central axis direction is made at the end of the reinforcing bar 3, and the cut 8 is enlarged by a weir jig 9 to expand the cut radially and fix the fixing body. Methods such as 5e have also been proposed.

JP, 2009-138455, A Japanese Patent Application Laid-Open No. 2003-041709 JP 2000-257209 A JP 2002-021253 A

  However, the method of forming the fixing body 5b as shown in FIG. 4D by the hot upsetting process and the method of forming the fixing body 5e by enlarging the incision 8 as shown in FIG. There is a problem that it is difficult to make the body 5 an optimal shape required for fixation. Further, as shown in FIG. 4F, in the method of forming the fixing member 5d by screwing the cap 6, the processing for screwing is complicated and there are many control items such as adhesion at the time of manufacture. There is a problem that it takes time and cost to manufacture the reinforcing bar 3 with the object 5. There is a need for a technique that can easily and economically manufacture reinforcing bars 3 having anchors 5 of optimum shape attached to the end.

  On the other hand, according to the above-described method of frictionally pressing the fixing member 5b, it can be expected that the fixing member 5 having a suitable shape can be attached to the end of the reinforcing bar 3 relatively easily. However, the friction welding is to generate friction heat while contacting the reinforcing bar 3 and the fixing object 5 with high pressure, and a large stress is generated in the reinforcing bar 3 and the fixing object 5 at the time of processing. There is a risk of changes in the nature. For example, the magnetic properties of metals are known to change when large stresses occur. In order to manufacture the rebar 3 with the anchor 5 utilizing the specific properties of the material, it is desirable not to generate large stress in the rebar 3 and the anchor 5 in the processing step.

  Therefore, an object of the present invention is to provide a method and an apparatus capable of producing a reinforcing bar with a required shape without generating a large stress during processing.

Referring to the embodiment shown in FIGS. 1 (A1) to (C1), in the method of manufacturing the reinforcing bar with fixing body according to the present invention, the hollow portion of fixing body shape communicating with the outside through the opening 16 into which one end of the reinforcing bar 3 can be inserted. The heating mechanism is included in the mold 10 in which the internal diameter 15 is formed, and the diameter W16 of the opening 16 is made substantially the same size as the cross-sectional diameter W3 of the reinforcing bar 3 and heated by the heating mechanism in the hollow portion 15 of the mold 10 After inserting 20, one end of the reinforcing bar 3 is inserted into the opening 16 of the mold 10, and the insertion of the one end of the reinforcing bar 16 cools the material 20 while closing the opening 16 to fix the fixing member made of the material 20 to one end of the reinforcing bar 3 5 is fixed.

Further, referring to the embodiment shown in FIGS. 1 (A1) to (C1), the apparatus for manufacturing a reinforcing bar with a fixing body according to the present invention comprises a mold 10 in which a hollow portion 15 of fixing body shape is formed; 15 and the cross-sectional diameter W3 substantially the same size as the opening 16 at one end are possible inserted and the opening diameter W16 of rebar 3 rebar 3 with an external communicating, and it includes a heating mechanism for heating the mold 10 After inserting the high-temperature melting material 20 into the hollow portion 15 of the mold 10 while heating with the heating mechanism, insert one end of the reinforcing bar 3 into the opening 16 of the mold 10 and close the opening 16 by inserting one end of the reinforcing bar 16 The material 20 is cooled and the fixing body 5 made of the material 20 is fixed to one end of the reinforcing bar 3.

Preferably, as shown in FIG. 1 (A1) and FIG. 1 (C1) , the opening 16 is provided at the upper end of the hollow portion 15, and one end of the reinforcing bar 3 is inserted vertically downward. The shape of the hollow portion 15 can be a rotational shape around the central axis C of the opening 16. If necessary, the hollow portion 15 may be provided with an inlet 17 for degassing of the high-temperature melting material 20 and a degassing hole which communicate with the outside separately from the opening 16.

  More preferably, as shown in FIG. 3, hollow portions 15 with a plurality of openings 16 are provided in the inside of the mold 10, and the high-temperature melting material 20 is inserted into each of the hollow portions 15. By simultaneously inserting and cooling one end of the plurality of reinforcing members 5 with the fixing body 5 can be simultaneously manufactured. The high-temperature melting material 20 can be, for example, a metal, a resin, or a resin in which a strength increasing material is mixed.

The method and apparatus for manufacturing a reinforcing bar with fixing body according to the present invention includes a heating mechanism in the mold 10 in which the hollow portion 15 of fixing body shape communicating with the outside through the insertable opening 16 of the reinforcing bar 3 is formed; The high-temperature melting material 20 is inserted into the hollow portion 15 of the mold 10 while heating by the heating mechanism, and then one end of the reinforcing bar 3 is inserted into the opening 16 of the mold 10 Since the material 20 is cooled by inserting it and closing the opening 16 by inserting one end of the reinforcing bar 16, the fixing body 5 made of the material 20 is fixed to one end of the reinforcing bar 3, the following advantageous effects can be obtained.

(A) Since the high-temperature melting material 20 solidifies in the shape of the hollow portion 15 of the mold 10 at the time of cooling to form the fixing body 5, the fixing portion 5 of the desired shape is formed by setting the hollow portion 15 into a desired fixing body shape in advance. The steel bar 3 integrally formed at one end can be manufactured simply and economically.
(B) A large stress does not occur in the reinforcing bar 3 when integrally molding the fixing body 5, so that no major property change occurs in the materials of the reinforcing bar 3 and the fixing body 5 in the processing step, and the fixing body excellent in property stability Rebar 3 with 5 can be manufactured.
(C) As the high-temperature melting material 20, not only metal but also synthetic resin can be used as long as the material can guarantee strength when cooled and solidified, for example, using resin and fixing body 5 It can also be expected to reduce the weight of the reinforcing bar 3.
(D) Rebar 3 with fixing body 5 can be rapidly manufactured by simple operation of charging high-temperature molten material 20 into hollow portion 15 of mold 10 and inserting rebar 3 into opening 16, and a plurality of openings By using the mold 10 provided with the hollow portion 15 with 16, it is possible to economically manufacture a large amount of reinforcing bars 3 with fixing body 5.

Hereinafter, modes and examples for carrying out the present invention will be described with reference to the attached drawings.
These are explanatory drawings of one Example of the manufacturing apparatus of the rebar with a fixing body by this invention. These are explanatory drawings of the other Example of the manufacturing apparatus of the rebar with a fixing body by this invention. These are explanatory drawings of the other Example of the manufacturing apparatus of the rebar with a fixing body by this invention. These are explanatory drawings of an example of the conventional rebar 3 with fixing body 5.

  FIG. 1 (A1) shows the Example of the manufacturing apparatus of the rebar 3 with the fixing body 5 by this invention. The manufacturing apparatus of the illustrated example is provided with a mold 10 in which a hollow portion 15 of fixing body shape is formed inside, and an opening 16 which communicates the hollow portion 15 with the outside with an aperture which one end of rebar 3 can be inserted. . The mold 10 can be the same as the mold used in the conventional casting technique, and can be a single mold such as a sand mold or a metal mold / ceramic mold (multiple mold) that can be used repeatedly. However, from the viewpoint of economy, it is desirable to use a mold 10 that can be used repeatedly, and the mold 10 of the illustrated example is made of a plurality of metals (steels) provided with a ceramic coating 15a on the inner surface of the hollow portion 15 inside. It is a loop type.

  The mold 10 of the illustrated example is comprised of a pair of right split molds 10a and 10b that can be split by the split line 12, and as shown in the cross section of FIG. 1 (A2) Each half of the hollow portion 15 of the fixing body shape is engraved. The hollow portion 15 in the illustrated example has a rotational shape around the central axis C of the opening 16 and has a frusto-conical shape in which the space diameter around the central axis C gradually increases as the distance from the opening 16 increases. However, as described later, the present invention fills the whole of the hollow portion 15 with the liquid high-temperature melting material 20 to form the fixing body 5, and if integration with the reinforcing bar 3 is possible, There is no particular limitation on the shape. That is, the shape of the hollow portion 15 can be any shape suitable for fixing the reinforcing bars, and can be, for example, a lithographic shape as shown in FIG. 1 (G). Further, the shape of the hollow portion 15 can be appropriately designed so as to be integrated with the reinforcing bar 3 with sufficient strength.

  Further, the mold 10 is provided with an opening 16 which allows the hollow portion 15 to communicate with the outside with a bore diameter into which one end of the reinforcing bar 3 can be inserted. The opening 16 in the illustrated example is provided at the upper end of the hollow portion 15 so as to straddle the left and right divided dies 10a and 10b. However, the installation position of the opening 16 is not limited to the upper end of the hollow portion 15. For example, as shown in FIG. 2A, it is possible to provide the opening 16 in the middle portion or the lower end of the hollow portion 15. When the opening 16 is provided at other than the upper end, the diameter W (16) of the opening 16 is substantially equal to the cross-sectional diameter W (3) of the reinforcing bar 3 so that the liquid high-temperature molten material 20 does not leak from the opening 16 It is desirable to be able to cool while closing the opening 16 by inserting the one end of the reinforcing bar 3 into the same size. Also when provided at the upper end of the hollow portion 15 as shown in FIG. 1, the aperture W (16) of the opening 16 can be substantially the same size as the cross-sectional diameter W (3) of the reinforcing bar 3.

  In addition to the opening 16, the mold 10 can be appropriately provided with a material inlet 17 for communicating the hollow portion 15 with the outside, a gas vent (not shown), and the like as needed. The diameter of the inlet and the gas vent may be smaller than the cross-sectional diameter of the reinforcing bar. For example, when the opening 16 is provided in the middle of the hollow portion 15 as shown in FIG. 2, the inlet 17 for the material 20 can be provided at the upper end of the hollow portion 15. The injection port 17 can also be used when the material 20 is additionally injected (poured) when the material 20 shrinks and a gap is generated in the hollow portion 15 in the cooling process. Also, the degassing holes can be used to remove gas and air generated from the material 20 in the cooling process. However, as described later, the material 20 can be charged into the hollow portion 15 through the opening 16 (see FIG. 1), and it is also possible to degas the opening 16. It is not necessary to provide the material inlet 17 and the degassing hole of.

  FIG. 1 (B1) and (C1) show the procedure of manufacturing the reinforcing bar 3 with the fixing body 5 using the mold 10 of the illustrated example. First, in FIG. 1 (B1), the high-temperature melting material 20 is loaded into the hollow portion 15 of the mold 10 (see also the cross section of FIG. 1 (B2)). The high-temperature melting material 20 can be melted at a high temperature in advance and then injected into the hollow portion 15 through the opening 16. Alternatively, as shown in FIG. 1 (D), a predetermined amount of condensed material 20a is introduced into the hollow portion 15 from the opening 16 and then the mold 10 is heated to melt the material 20 in the hollow portion 15 at high temperature Is also conceivable. For this purpose, the mold 10 can include any suitable heating mechanism.

  Then, as shown in FIG. 1 (C1), one end of the reinforcing bar 3 is inserted into the opening 16 of the mold 10 until it abuts on the inner surface of the hollow portion 15 (see also the cross section in FIG. 1 (C2)). When the opening 16 is provided at the upper end of the hollow portion 15 as in the illustrated example, one end of the reinforcing bar 3 is inserted into the hollow portion 15 vertically downward. The reinforcing bar 3 to which the present invention can be applied is not particularly limited, but the present invention can be applied to, for example, a deformed bar for concrete (bar stock). Thereafter, the material 20 is cooled to fix and fix the fixing body 5 made of the material 20 to one end of the reinforcing bar 3. If necessary, the high-temperature molten material 20 may be additionally injected into the gap formed in the hollow portion 15 in the cooling process.

  The high-temperature molten material 20 charged into the hollow portion 15 may be made of, for example, the same metal as the reinforcing bar 3 inserted into the opening 16, but may be made of other metals. The material can be made of synthetic resin as long as the material can guarantee the strength. When using a resin, fibers and other strength-increasing agents can be mixed as needed. For example, as shown in FIG. 1 (E), the reinforcing wire coil-like strength increasing material 21 is larger than the cross sectional diameter of the reinforcing bar 3 together with the reinforcing bar 3 or in advance of the reinforcing bar 3 in the resin material 20 of the hollow portion 15 Then, the reinforcing material 3 is fixed to one end of the reinforcing bar 3 together with the resin material 20 and integrated with the reinforcing material in the form of a coil of a hard wire. By using the resin material 20, it can be expected to reduce the weight of the rebar 3 with the fixing body 5 as compared to the case where the metal material 20 is applied.

  Moreover, it is also possible to reverse the procedure of FIG. 1 (B1) and (C1), and to manufacture the rebar 3 with the fixing body 5. FIG. That is, first, one end of the reinforcing bar 3 is inserted into the opening 16 of the mold 10 until it abuts against the inner surface of the hollow portion 15 (cross section in FIG. 1 (C2)), and then the high temperature melting material 20 is inserted into the hollow portion 15 of the mold 10 Then, the material 20 is cooled and the fixing body 5 made of the material 20 is fixed to one end of the reinforcing bar 3 so as to be integrated. When the opening 16 is closed by the insertion of one end of the reinforcing bar 3, the material injection port 17 is provided separately from the opening 16 as shown in the illustrated example, and the high temperature melting material is introduced from the injection port 17 to the hollow portion 15 after rebar charging. 20 can be injected. Depending on the material and shape of the reinforcing bar 3 and the fixing body 5, which of the procedures in FIG. 1 (B1) and (C1) is to be preceded is determined by determining which procedure is suitable for the integration of the two. be able to.

  FIGS. 2 (B) and 2 (C) show a procedure for manufacturing the reinforcing bar 3 with the fixing body 5 using the mold 10 of FIG. 2 (A). In the illustrated example, first, one end of the reinforcing bar 3 is inserted into the opening 16 of the middle part of the mold 10 until it abuts on the inner surface of the hollow part 15 (FIG. 2 (B)), and then provided at the upper end of the hollow part 15 of the mold 10 The high-temperature molten material 20 is loaded from the inlet 17 into the hollow portion 15 after rebar loading (FIG. 2 (C)). Further, the aperture W (16) of the opening 16 is made substantially the same size as the cross-sectional diameter of the reinforcing bar 3, and the opening 16 at the middle portion of the hollow portion 15 is closed by horizontally inserting one end of the reinforcing bar 3. If necessary, the high-temperature molten material 20 may be additionally injected from the injection port 17 into the gap formed in the hollow portion 15 in the cooling process. Thereafter, by cooling the material 20, the fixing body 5 made of the material 20 can be fixed and integrated to one end of the reinforcing bar 3.

  FIG. 1 (F) shows a procedure for taking out the product after cooling (rebar 3 with fixing body 5) from the mold 10, and separating the pair of split molds 10a and 10b to the left and right to release the product. Represents In the mold 10 of the illustrated example, by providing a ceramic coating on the inner surface of the hollow portion 15, the release of the product after cooling is facilitated. When a single mold such as sand mold is used, the product is taken out by removing the mold 10 itself. However, for facilitating the release of the product, a suitable separation is performed on the inner surface of the hollow portion 15 A mold agent etc. can be applied. The surface of the demolded product is cleaned and inspected to complete the production of the reinforcing bar 3 with the fixing body 5.

  According to the present invention, since the liquid high-temperature melting material 20 is cooled and solidified into the shape of the mold hollow portion 15 to form the fixing body 5, the hollow portion 15 has a desired fixing body shape. Rebar 3 in which fixing material 5 is integrally formed at the end can be manufactured simply and economically. Moreover, since a large stress does not occur in the reinforcing bar 3 when the fixing body 5 is integrally molded, there is no possibility that the material of the reinforcing bar 3 and the fixing body 5 changes significantly in the processing step, and the fixation is excellent in property stability. It can be set as the reinforcing bar 3 with the body 5.

  Thus, it is possible to achieve the provision of the method and apparatus capable of producing a bar with a required shape without generating large stress during processing, which is the object of the present invention.

  FIG. 3 shows another embodiment of the manufacturing apparatus of the present invention in which a plurality of hollow portions 15 are provided inside the mold 10. The mold 10 of the manufacturing apparatus of the illustrated example has a plurality of hollow portions 15 in the shape of a fixing body arranged in a row inside, and communicates with the outside with an aperture that allows one end of the reinforcing bar 3 to be inserted into each hollow portion 15 respectively. An opening 16 is provided. Each hollow portion 15 is independent, and there is a gap between each other. Further, as in the case of FIG. 1, the mold 10 is made of metal (steel) constituted by a pair of split molds 10 a and 10 b that can be split at split lines 12 intersecting the hollow portions 15. A ceramic coating 15 a is provided on the inner surface of the portion 15.

  When manufacturing the reinforcing bar 3 with the fixing body 5 using the mold 10 of FIG. 3, as in FIG. 1 (B 1), the high-temperature melting material 20 is inserted into each hollow portion 15 and FIG. 1 (C 1) Similarly, one end of the reinforcing bar 3 is inserted into the opening 16 of each hollow portion 15. As in the case of FIG. 1, which of the procedures for charging the high-temperature molten material 20 and the insertion of the reinforcing bar 3 precedes either of the procedures depending on the material and shape of the reinforcing bar 3 and the fixing member 5. You can decide whether it is suitable for the integration of Then, the material 20 of each hollow portion 15 is cooled, and the fixing body 5 made of the material 20 is fixed to one end of the reinforcing bar 3 and integrated. By separating the pair of split molds 10a and 10b left and right after cooling, it is possible to manufacture a plurality of reinforcing bars 3 with fixing body 5 simultaneously.

  Further, the manufacturing apparatus of FIG. 3 is provided with an insertion device 18 which simultaneously inserts the plurality of reinforcing bars 3 into the plurality of hollow portions 15 of the mold 10 while supporting the plurality of reinforcing bars 3. That is, a step of charging the high-temperature molten material 20 into the plurality of hollow portions 15 of the mold 10, a step of simultaneously inserting the plurality of reinforcing bars 3 into the hollow portions 15 by the insertion device 18, and a pair of split molds of the mold 10 It is possible to repeat the steps of separating 10a and 10b and simultaneously taking out the rebar 3 with the fixing body 5 after cooling. By using a mold 10 provided with a plurality of hollow portions 15 with openings 16 as shown in FIG. 3, it is possible to rapidly and economically manufacture a large amount of rebar 3 with a fixing body 5 by repeating such a process. Become.

DESCRIPTION OF SYMBOLS 1 ... Concrete pillar 2 ... Concrete beam 3 ... Rebar 5 ... Fixing body 6 ... Fixing cap 7 ... Adhesive 8 ... Incision 9 ... A jig 10 ... Mold 10a, 10b ... Divided type 12 ... Division line 15 ... Hollow part 16 ... Opening 17: Injection port 18: Insertion device 19: Rebar support 20: High-temperature melting material 21: Strength increasing material C: Opening central axis W: Rebar diameter, opening diameter

Claims (9)

The heating mechanism is included in the mold in which the hollow part of the fixing body shape which communicates with the outside through an opening into which one end of the reinforcing bar can be inserted is formed including the heating mechanism, the opening diameter is made substantially the same as the cross sectional diameter of the reinforcing bar in heating while inserting one end of the rebar into the opening of the mold after was charged with high temperature molten material to the hollow portion of the mold, the reinforcing bar by cooling the material while closing the opening by insertion of one end of the reinforcing bar The manufacturing method of the rebar with a fixing body which makes the fixing body made from the said material adhere on one end. The method according to claim 1 , wherein the opening is provided at the upper end of the hollow portion, and one end of the reinforcing bar is inserted vertically downward. The method according to claim 1 or 2 , wherein the hollow portion has a shape rotating about a central axis of the opening. The method according to any one of claims 1 to 3 , wherein the hollow portion is provided with a material injection port communicating with the outside separately from the opening. The method according to any one of claims 1 to 4 , wherein the high-temperature melting material is a metal, a resin, or a resin in which a strength increasing material is mixed. Mold hollow portion of the fixing body shape is formed therein, the hollow portion and the outside one end of the rebar with communicating are possible inserts and opening diameter of the cross-sectional diameter substantially the same size as the rebar opening, and A heating mechanism for heating the mold is provided, and a high-temperature molten material is charged into the hollow portion of the mold while being heated by the heating mechanism, and then one end of a reinforcing bar is inserted into the opening of the mold ; An apparatus for manufacturing a rebar with a fixing body, wherein the material is cooled while closing the opening by insertion and the fixing body made of the material is fixed to one end of the rebar. The apparatus according to claim 6 , wherein the opening is provided at the upper end of the hollow portion, and one end of the reinforcing bar is inserted vertically downward. The apparatus according to claim 6 or 7 , wherein the hollow portion has a shape rotating about a central axis of the opening. 9. The apparatus according to any one of claims 6 to 8 , wherein a plurality of said hollows with openings are provided in the interior of said mold, and a high temperature melting material is charged into each of said hollows and one end of each reinforcing bar is inserted into each of said openings. A manufacturing unit for reinforcing bar with rebar which is made by inserting simultaneously and cooling.