JP2014091906A - Method for manufacturing spacer for reinforced concrete - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a spacer for reinforced concrete, capable of manufacturing spacers for reinforced concrete having various sizes efficiently and at low cost.SOLUTION: A method for manufacturing a spacer for reinforced concrete includes: a circular pipe cutting step of cutting a circular pipe body having a specified length for forming a spacer from a long circular pipe member; a bolt supporting step of inserting a shank of a bolt into an insertion hole formed in a mounting table and supporting the bolt in a state that one end of the bolt is exposed to the upper surface side of the mounting table; a circular pipe body mounting step of vertically installing the circular pipe body for forming the spacer on the mounting table so that one end of the bolt is accommodated inside the circular pipe body for forming the spacer cut by a predetermined length; and a ready-mixed concrete pouring step of pouring ready-mixed concrete from the upper end side of the circular pipe body for forming the spacer vertically installed on the mounting table.

Description

  The present invention relates to a method for manufacturing a reinforced concrete spacer for maintaining a covering margin of concrete by maintaining a predetermined distance between a reinforcing bar and a formwork arranged outside the reinforcing bar when constructing a reinforced concrete structure. About.

  Conventionally, when building reinforced concrete structures such as building slabs and highway bridge girders, spacers for reinforced concrete used to secure the cover for concrete between the reinforcing bars and the structures and formwork are known. Yes.

  As this reinforced concrete spacer, for example, as shown in FIG. 12, a metal rod-like body 102 is embedded in a concrete spacer body 101 so that both ends thereof are exposed from both side surfaces of the spacer body 101. The spacer main body 101 is disposed at the intersection of the vertical reinforcing bar 103 and the horizontal reinforcing bar 104 that are substantially orthogonal, and the spacer main body 101 is attached to the vertical and horizontal reinforcing bars 103 and 104 by the wire 105 using the exposed portion of the rod-like body 102. It is known that the spacer body 101 is fixed and held in a state in which the front end of the spacer main body 101 is in contact with the inner surface of the mold W to secure the covering margin of the concrete K. Such a reinforced concrete spacer is usually formed by forming a mold such as a mold corresponding to the shape of the spacer main body, pouring the ready-mixed concrete into the mold, and then solidifying the mold.

  As described above, a conventional reinforced concrete spacer is mass-produced by forming a mold corresponding to the shape of the spacer body, injecting the ready-mixed concrete into the mold, and then solidifying it. There is a problem that it is difficult to manufacture a spacer whose dimensions are finely changed in terms of inventory management and cost. In other words, because the mold is usually made of a metal mold, for example, when trying to manufacture a spacer whose length dimension is changed in 1 cm increments, naturally, there are required molds for the types of spacers having different length dimensions. The cost required for mold production will be enormous. Also, for example, if a spacer whose length is changed in 1 cm increments is manufactured, not all spacers are used at the construction site, so the manufactured spacers remain in stock, The space and labor to manage will be tremendous. Therefore, because of such inventory management and cost problems, reinforced concrete spacers are usually manufactured with a certain degree of dimensional difference, for example, in increments of 5 cm.

  However, in actual construction sites, it is a fact that the size of the cover allowance required from the design drawing of the building varies in various ways. In the spacer manufactured with a certain dimensional difference, There is a problem that it is difficult to secure a cover margin corresponding to the dimension. In such a case, it is necessary to cut off the tip of the spacer main body of the spacer for reinforced concrete, or to perform a separate process for making the spacer main body long, which requires a great deal of labor. Further, in some cases, the cover allowance is formed using a reinforced concrete spacer that is inappropriate in dimension without securing the cover allowance corresponding to the design dimension.

  The present invention has been made to solve such a problem, and provides a method for manufacturing a reinforced concrete spacer capable of efficiently and inexpensively manufacturing reinforced concrete spacers having various dimensions. Objective.

  SUMMARY OF THE INVENTION The object of the present invention is to provide a reinforced concrete spacer for maintaining a covering margin of a concrete by maintaining a predetermined distance between the reinforcing bar and a mold disposed outside when the reinforced concrete structure is constructed. And a step of cutting a circular tube for forming a spacer having a predetermined length from a long circular tube member, and inserting a shaft portion of a bolt into an insertion hole formed in the mounting table. A bolt supporting step for supporting the bolt in a state where one end of the bolt is exposed on the upper surface side of the mounting table, and one end of the bolt inside the spacer-forming circular tube cut out to a predetermined length. A step of placing the circular tube body for spacer formation on the mounting table so as to be accommodated, and an upper end side of the circular tube body for spacer formation standing on the mounting table; Raw concrete It is achieved by the method of manufacturing a reinforced concrete spacer and a fresh concrete injection step of pouring.

  In the method for manufacturing a reinforced concrete spacer according to the present invention, a spacer forming circular pipe body is cut out from a long circular pipe member, and the cut out spacer forming circular pipe body is used as a spacer manufacturing mold. Therefore, by appropriately changing the cut-out dimension, it is possible to efficiently manufacture a spacer having a desired length dimension at a low cost.

  In this method for manufacturing a reinforced concrete spacer, the long circular pipe member is preferably formed of a synthetic resin material. By using a long circular pipe member formed of a synthetic resin material in this way, it is easy to cut out a spacer forming circular pipe body having a desired size, and it is necessary for the spacer forming circular pipe body to be cut out. Workability can be improved. Moreover, since a commercially available pipe made of vinyl chloride can be used as a circular pipe member, it is possible to manufacture a reinforced concrete spacer more easily and at a lower cost.

  Further, it is preferable that a pre-stage of the ready-mixed concrete pouring step further includes a release agent applying step of providing a release agent inside the spacer forming circular pipe body. In this way, by providing a release agent inside the spacer forming circular pipe body, it becomes easier to take out the reinforced concrete spacer from the spacer forming circular pipe body, so that the workability of manufacturing the reinforced concrete spacer is improved. Can do.

  Further, it is preferable that the release agent is release paper that is inserted into a cylindrical shape inside the spacer forming circular tube. When the release paper inserted in a cylindrical shape as described above is used as a release agent, the release paper that is rolled up into a cylindrical shape and inserted inside the spacer forming circular tube is the original sheet of the release paper itself. Because the release paper is automatically stuck to the inner surface of the spacer forming circular tube due to the resilience to return to the shape, a release agent is provided inside the spacer forming circular tube. It becomes possible to improve workability at the time.

  Moreover, it is preferable that the said bolt support step supports the said bolt by mounting the bolt head part of the said bolt on the surface of the said mounting base in the circumference | surroundings of the said insertion hole. With such a configuration, a part of the bolt can be reliably and easily embedded in the reinforced concrete spacer.

  Further, the mounting table is formed of a flat plate member, the insertion hole formed in the mounting table is a through hole, and the bolt support step is disposed on the back surface side of the flat mounting table. It is preferable that a bolt fixing step of fixing the bolt is further provided by applying an attractive force of the magnet body to be applied to a shaft portion of the bolt inserted into the insertion hole. In this way, by fixing the bolts by applying the attractive force of the magnet body, it is possible to easily and effectively suppress the bolt position from being changed by the ready-mixed concrete poured into the spacer forming circular pipe body. It becomes possible to do.

  In the circular tube mounting step, a cylindrical base is provided on the mounting base concentrically with the insertion hole, and one end of the spacer forming circular tube is fitted inside the cylindrical base. Accordingly, it is preferable that the circular tube for forming the spacer is erected on the mounting table. With such a configuration, the spacer forming circular tube body can be stably erected on the mounting table.

  Further, the above-mentioned object of the present invention is to provide a reinforced concrete for maintaining a covering margin of the concrete by maintaining a predetermined distance between the reinforcing bar and the mold frame disposed outside when the reinforced concrete structure is constructed. A spacer manufacturing method for cutting a spacer-forming circular tube body of a predetermined length from a long circular tube member, and a spacer-forming circular tube body cut to a predetermined length A circular tube body mounting step standing on the mounting table with one end on the lower side, a shaft portion of the bolt inserted into a through hole formed in the flat lid, and one end of the bolt being A bolt support step for supporting the bolt in a state exposed on the lower surface side of the lid, and a ready-mixed concrete pouring step for pouring ready-mixed concrete from the upper end side of the spacer-forming circular tube set up on the mounting table; ,Previous A lid placing step for placing one end of the bolt inside the spacer forming circular tube and placing the lid supporting the bolt on the upper end of the spacer forming circular tube. It is achieved by the manufacturing method of the spacer for reinforced concrete provided with these.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the spacer for reinforced concrete which can manufacture the spacer for reinforced concrete which has various dimensions efficiently and at low cost can be provided.

It is a block diagram of the manufacturing method of the spacer for reinforced concrete which concerns on one Embodiment of this invention. It is explanatory drawing for demonstrating the process of the bolt support step in the block diagram shown in FIG. It is explanatory drawing for demonstrating the modification of a mounting base. It is explanatory drawing for demonstrating the process of the circular tube body mounting step in the block diagram shown in FIG. It is explanatory drawing for demonstrating the process of the circular tube body mounting step in the block diagram shown in FIG. It is explanatory drawing for demonstrating the process of the ready-mixed concrete injection | pouring step in the block diagram shown in FIG. It is explanatory drawing for demonstrating the process of a mold release agent provision step. It is explanatory drawing for demonstrating the usage example of the spacer for reinforced concrete manufactured by the manufacturing method of the spacer for reinforced concrete which concerns on this invention. It is a block diagram regarding the other manufacturing method of the spacer for reinforced concrete. It is explanatory drawing for demonstrating the process of the bolt support step in the block diagram shown in FIG. It is explanatory drawing for demonstrating the process of the cover body mounting step in the block diagram shown in FIG. It is explanatory drawing for demonstrating the spacer for reinforced concrete.

  Hereinafter, the manufacturing method of the spacer for reinforced concrete concerning embodiment of this invention is demonstrated with reference to an accompanying drawing. In the method for manufacturing a reinforced concrete spacer according to the present invention, when a reinforced concrete structure is constructed, a concrete cover is maintained by maintaining a predetermined distance between the reinforcing bar and a mold disposed outside thereof. As shown in the block diagram of FIG. 1, a method for manufacturing a reinforced concrete spacer for cutting a circular pipe, a bolt support step, a circular pipe body placing step, a ready concrete pouring step, and a drying step, It has.

  The circular tube cutting step is a step of cutting a spacer-forming circular tube body Z having a predetermined length from a long circular tube member. As the long circular pipe member, those formed of various materials can be used. For example, it is preferable from the viewpoint of cost and work to use a circular pipe member formed of a synthetic resin material. . As a circular pipe member formed for such a synthetic resin material, a pipe made of vinyl chloride which is generally sold can be used. Moreover, the internal diameter of a circular pipe member can use the thing of a various dimension suitably according to the outer diameter dimension of the spacer for reinforced concrete to manufacture.

  As shown in FIG. 2, the bolt support step is a state where the shaft portion 31 of the bolt 33 is inserted into the insertion hole 2 formed in the mounting table 1 and one end of the bolt 3 is exposed on the upper surface side of the mounting table 1. In this step, the bolt 3 is supported. The shaft portion 31 of the bolt 3 is formed with a male screw portion to which a nut or the like can be screwed. The inner diameter of the insertion hole 2 is set to be slightly larger than the diameter of the shaft portion 31 of the bolt 3. In the configuration shown in FIG. 2, a bolt head 32 is formed at one end of the shaft portion 31 of the bolt 3, and the bolt head 32 is mounted on the surface of the mounting table 1 around the insertion hole 2. It is comprised so that the volt | bolt 3 may be supported by placing. With such a configuration, part of the bolt 3 can be reliably and easily embedded in the reinforced concrete spacer. Note that the bolt 3 to be used is not limited to the one having the bolt head 32, and a bolt constituted only by the shaft portion 31 without the bolt head 32 may be used. When such a bolt without the bolt head 32 is used, it may be appropriately fixed so that one end of the bolt shaft portion 31 is exposed on the upper surface side of the mounting table 1.

  As the mounting table 1, various types can be used. For example, as shown in FIG. 3, the mounting table 1 is constituted by a flat plate member, and the insertion hole 2 formed in the mounting table 1. May be configured as the through hole 91. When using the plate-like mounting table 1 in which the through hole 91 is formed as the insertion hole 2 in this way, the above-described bolt support step is performed by using the attracting force of the magnet body 4 arranged on the back surface side of the plate-like mounting table 1. It is preferable to further comprise a bolt fixing step for fixing the bolt 3 by acting on the shaft portion 31 of the bolt 3 inserted into the insertion hole 2. Thus, when utilizing the magnet body 4, the volt | bolt 3 is formed with the magnetic material adsorb | sucked to a magnet. Moreover, it is preferable that the flat mounting table 1 is also made of a magnetic material that attracts magnets. Further, as shown in FIG. 3, a magnet body 4 having a diameter larger than the inner diameter of the insertion hole 2 is used, and the magnet body 4 is closed so as to close the insertion hole 2 on the back surface side of the mounting table 1. Deploy. By fixing the bolt 3 by applying the attractive force of the magnet body 4 in this manner, the position of the bolt 3 is changed (shifted) by the ready-mixed concrete poured into the spacer forming circular tube Z. It becomes possible to suppress easily and effectively.

  In the circular tube mounting step, as shown in FIG. 4A, one end of the bolt 3 is accommodated inside the spacer forming circular tube Z cut to a predetermined length in the circular tube cutting step. In this step, the spacer forming circular tube Z is erected on the mounting table 1. In this step, the spacer 3 is formed so that one end (bolt head 32) of the bolt 3 is disposed at a substantially central portion of the spacer-forming circular tube Z in plan view, as shown in FIG. The circular tube body Z is preferably erected on the mounting table 1.

  Further, in this circular tube mounting step, as shown in FIG. 5, a cylindrical pedestal 5 is provided on the mounting table 1 concentrically with the insertion hole 2, and a spacer forming circle is provided inside the cylindrical pedestal 5. It is preferable that the circular tube body Z for spacer formation is erected on the mounting table 1 by fitting one end portion of the tube body Z. With such a configuration, the spacer forming circular tube Z can be stably erected on the mounting table 1. In FIG. 5, a cylindrical pedestal 5 formed as a separate body from the mounting table 1 is configured to be mounted on the mounting table 1. According to such a configuration, the cylindrical pedestal 5 corresponding to the outer dimensions of each spacer forming circular tube Z is prepared for various spacer forming circular tubes Z having different outer diameters. By mounting the cylindrical pedestal 5 at a predetermined position on the mounting table 1, it is possible to stably and efficiently manufacture reinforced concrete spacers having various diameters.

  The ready-mixed concrete pouring step is a process of pouring ready-mixed concrete from the upper end portion side of the spacer forming circular pipe Z standing on the mounting table 1. When pouring the ready concrete into the spacer forming circular tube Z, for example, as shown in FIG. 6, a ready concrete pouring tank 6 is arranged on the upper end side of the spacer forming circular tube Z, and The ready-mixed concrete supplied to the ready-mixed concrete pouring tank 6 is poured into the spacer forming circular pipe Z through the pouring hole 61 provided at the bottom of the concrete pouring tank 6.

  Moreover, you may comprise so that the mold release agent provision step which provides a mold release agent in the inner side of the circular tube body Z for spacer formation may be further provided in the front | former stage of the above-mentioned ready concrete injection | pouring step. The mold release agent enhances the sliding property between the inner peripheral surface of the spacer forming circular tube Z and the concrete solidified by drying inside the spacer forming circular tube Z, and removes the spacer from the spacer forming circular tube Z. It is provided to facilitate removal. As such a release agent, for example, a release agent containing a silicone compound and / or a fluorine compound can be used. When a release agent containing a silicone compound and / or a fluorine compound is used, it is applied by applying it to the inside of the spacer-forming circular tube Z before the ready-mixed concrete is poured. Examples of silicone compounds used in the release agent include polyalkylphenylsiloxane, alkyl-modified silicone oil, polyether-modified silicone oil, polyalkylsiloxane, polymethylsilsesquioxane, polyalkylhydrogen siloxane, polyalkylalkenylsiloxane, Examples thereof include polymethylphenylsiloxane, aralkyl-modified silicone oil, polydimethylsiloxane, and alkylaralkyl-modified silicone oil. Especially, 1 or more types chosen from the group which consists of polyalkylsiloxane and polydimethylsiloxane from a viewpoint of a peeling effect is preferable. Examples of the fluorine compound used for the release agent include polytetrafluoroethylene, poly (vinylidene difluoride), polyvinyl fluorine, poly (fluorinated ethylene propylene), and fluorine-containing surfactants. Of these, polytetrafluoroethylene is preferred from the viewpoint of the peeling effect.

  As the release agent, release paper such as kraft paper, paraffin paper, and oil paper can be used. When such a release paper is used, it is performed by inserting the release paper into a cylindrical shape and inserting it inside the spacer forming circular tube Z before the ready concrete is poured. The release paper rolled into a cylindrical shape is inserted inside the spacer forming circular tube Z in such a posture that its axis is parallel to the axis of the spacer forming circular tube Z. As shown in FIG. 7, the release paper 7 rolled into a cylindrical shape and inserted inside the spacer forming circular tube Z has a recovery property of returning to the original sheet shape of the release paper itself, as shown in FIG. Since it is arranged in a state of sticking to the inner surface of the spacer forming circular tube Z, it is more than a case where a release agent containing a silicone compound and / or a fluorine compound is applied to the inside of the spacer forming circular tube Z. However, it is excellent in workability, and it becomes possible to manufacture a reinforced concrete spacer efficiently.

  The drying step is a step of drying and solidifying the ready-mixed concrete poured into the spacer forming circular tube Z. Specifically, the ready-mixed concrete is dried by natural drying for a predetermined time or by drying in a high temperature atmosphere.

  After the drying step is completed, the spacer that has been dried and solidified is taken out from the inside of the spacer forming circular tube Z, whereby the manufacture of the reinforced concrete spacer is completed.

  The reinforced concrete spacer manufactured in this way is used together with the fastening member 8 as shown in FIG. The fastening member 8 is formed by bending a metal flat plate into a U-shape, and includes a base portion 81 and opposing pieces 82 and 83 at both ends of the base portion 81 facing each other at a predetermined interval. . A female thread portion into which the bolt 3 in the reinforced concrete spacer is screwed is formed at the center of the base portion 81. The opposing piece 82 is formed with a female screw portion 85. The position of the female screw portion 85 is a position that is a distance larger than the diameter of the reinforcing bar 100 with reference to the inner position of the base portion 81 with which the reinforcing bar 100 can contact, and is tightened by screwing the bolt 86 to the female screw portion 85. It is desirable that the reinforcing member 100 be formed at a position where the reinforcing bar 100 can be sandwiched between the inner surface of the attaching member 8 and the tip of the bolt 86.

  Then, when such a spacer is actually used, as shown in FIG. 8, tightening is performed so that the reinforcing bar 100 is fitted inside the fastening member 8, that is, between the opposing pieces 82 and 83 of the fastening member 5. The attaching member 8 is applied to a predetermined position of the reinforcing bar 100, and the bolt 86 is screwed into the female thread portion 85 in the facing piece 82 of the fastening member 8. Here, when the bolt 86 is screwed into the female thread portion 85, the tip of the bolt 86 comes into contact with the reinforcing bar 100, the reinforcing bar 100 is sandwiched between the inner surface of the fastening member 8 and the tip of the bolt 86, and the spacer is the reinforcing bar. 100 is fixed. Here, as shown in FIG. 8, the total dimension of the length of the spacer main body S and the thickness of the fastening member 8 (base portion 81) is held as a concrete covering margin T.

  In the method for manufacturing a reinforced concrete spacer according to the present embodiment, a spacer forming circular pipe body Z is cut out from a long circular pipe member, and the cut out spacer forming circular pipe body Z is used as a spacer manufacturing mold. Therefore, by appropriately changing the cut-out dimension, a spacer having a desired length dimension can be manufactured efficiently and at low cost.

  Further, in the method for manufacturing a reinforced concrete spacer according to the present embodiment, when a long circular pipe member formed of a synthetic resin material is used, a spacer forming circular pipe body Z having a desired dimension is efficiently obtained. And it can cut out simply and it becomes possible to improve the workability | operativity required for the cutting-out operation | work of the circular tube body Z for spacer formation. Moreover, since a commercially available pipe made of vinyl chloride can be used as a circular pipe member, it is possible to manufacture a reinforced concrete spacer more easily and at a lower cost.

  In addition, in the pre-stage of the ready-mixed concrete pouring step, when it is configured to include a release agent applying step for providing a release agent inside the spacer forming circular pipe body Z, the spacer forming circular pipe body Z to the reinforced concrete spacer Since it becomes easy to take out, workability | operativity of manufacture of the spacer for reinforced concrete can be improved.

  Further, when a release paper 7 that is rolled up and inserted into a cylindrical shape inside the spacer forming circular tube Z is used as a release agent, it is rolled into a cylindrical shape and inserted into the spacer forming circular tube Z. The released release paper 7 is arranged in a state in which the release paper 7 is automatically stuck to the inner surface of the spacer forming circular tube Z due to the restoration property of returning to the original sheet shape of the release paper itself. Therefore, it is possible to improve the workability when providing the release agent inside the spacer forming circular tube Z.

  As mentioned above, although one Example regarding the manufacturing method of the spacer for reinforced concrete which concerns on this invention was described, a specific structure is not limited to the said embodiment. For example, you may comprise as shown in the block diagram of FIG. In the manufacturing method based on the block diagram shown in FIG. 9, when constructing a reinforced concrete structure, a concrete cover is maintained by maintaining a predetermined distance between the reinforcing bar and a formwork arranged outside thereof. A method of manufacturing a spacer for reinforced concrete, comprising: a circular tube cutting step, a circular tube body placing step, a bolt supporting step, a ready concrete pouring step, a lid placing step, and a drying step. It is configured.

  The circular tube cutting step is a step of cutting a spacer-forming circular tube body Z having a predetermined length from a long circular tube member. This process has the same process contents as the process in the block diagram shown in FIG.

  The circular tube body mounting step is a step of standing on the mounting table 1 with one end of the spacer forming circular tube Z cut out to a predetermined length in the circular tube cutting step facing downward.

  As shown in FIG. 10, the bolt support step inserts the shaft portion 31 of the bolt 3 into the through hole 91 formed in the flat lid body 9, and places one end of the bolt 3 on the lower surface side of the lid body 9. This is a process of supporting the bolt 3 in an exposed state. In FIG. 10, the bolt head 32 provided on one end side of the bolt 3 is disposed so as to be exposed on the back surface side of the lid body 9, and the magnet body 4 is disposed on the upper surface side of the lid body 9. The bolt 3 is fixedly supported in such a manner that the bolt 3 is suspended by causing the attracting force of the magnet body 4 to act on the shaft portion 31 of the bolt 3 by being arranged immediately above 91. Instead of using the magnet body 4, the bolt 3 may be suspended by an appropriate fixing method so that one end of the shaft portion 31 of the bolt 3 is exposed on the lower surface side of the lid body 9. .

  The ready-mixed concrete pouring step is a step of pouring ready-mixed concrete into the spacer forming circular tube Z from the upper end side of the spacer forming circular tube Z erected on the mounting table 1. The process content is the same as the process in the block diagram shown. The ready-mixed concrete is poured up to the upper end of the spacer forming circular tube Z.

  In the lid mounting step, as shown in FIG. 11, the bolt 3 is supported so that one end of the bolt 3 is accommodated inside the spacer forming circular tube Z standing on the mounting table 1. In this step, the lid body 9 is placed on the upper end of the spacer forming circular pipe body Z.

  The drying step is a step of drying and solidifying the ready-mixed concrete poured into the spacer forming circular tube Z, and has the same process contents as the steps in the block diagram shown in FIG.

  After the drying step is completed, the magnet body 4 arranged on the upper surface side of the lid body 9 is removed, the lid body 9 is removed, and the dried and solidified spacer is taken out from the inside of the spacer forming circular tube Z. Thus, the manufacture of the reinforced concrete spacer is completed.

  Thus, also by the manufacturing method as shown in the block diagram of FIG. 9, the spacer forming circular pipe body Z is cut out from the long circular pipe member, and the cut out spacer forming circular pipe body Z is used for manufacturing the spacer. Since it is used as a mold, it is possible to efficiently manufacture a reinforced concrete spacer having a desired length dimension at a low cost by appropriately changing the cut-out dimension.

DESCRIPTION OF SYMBOLS 1 Mounting base 2 Insertion hole 3 Bolt 31 Shaft part 32 Bolt head 4 Magnet body 5 Cylindrical base 6 Raw concrete pouring tank 61 Inlet 7 Release paper 8 Tightening member 9 Lid S Spacer body T Cover margin Z Spacer formation Circular tube

Claims (8)

When constructing a reinforced concrete structure, a method for manufacturing a reinforced concrete spacer for maintaining a concrete cover by maintaining a predetermined interval between a reinforcing bar and a mold disposed outside thereof,
A circular tube cutting step of cutting out a circular tube body for forming a spacer having a predetermined length from a long circular tube member;
A bolt support step for inserting the shaft portion of the bolt into the insertion hole formed in the mounting table, and supporting the bolt in a state where one end of the bolt is exposed on the upper surface side of the mounting table,
A circular tube mounting on which the spacer forming circular tube is erected on the mounting table so as to accommodate one end of the bolt inside the spacer forming circular tube cut out to a predetermined length. Steps,
The manufacturing method of the spacer for reinforced concrete provided with the ready-mixed concrete injection | pouring step which pours ready-mixed concrete from the upper end part side of the said circular tube body for spacer formation erected on the mounting table.   The method for manufacturing a reinforced concrete spacer according to claim 1, wherein the elongated circular pipe member is formed of a synthetic resin material.   The manufacturing method of the spacer for reinforced concrete of Claim 1 or 2 provided with the mold release agent provision step which provides a mold release agent inside the said circular tube body for spacer formation in the pre-stage of the said ready-mixed concrete injection | pouring step. Method.   4. The method for manufacturing a reinforced concrete spacer according to claim 3, wherein the release agent is release paper inserted in a cylindrical shape inside the spacer forming circular tube.   The said bolt support step supports the said bolt by mounting the bolt head part of the said bolt on the surface of the said mounting base in the circumference | surroundings of the said insertion hole, The said bolt is supported. Manufacturing method of spacer for reinforced concrete. The mounting table is formed of a flat plate member, and the insertion hole formed in the mounting table is a through hole,
The bolt support step is a bolt fixing for fixing the bolt by applying an attracting force of a magnet body arranged on the back surface side of the flat plate-shaped mounting table to a shaft portion of the bolt inserted into the insertion hole. The method for producing a reinforced concrete spacer according to any one of claims 1 to 5, further comprising a step.   In the circular tube body mounting step, a cylindrical pedestal is provided on the mounting table concentrically with the insertion hole, and one end of the spacer forming circular tube body is fitted inside the cylindrical pedestal. The method for producing a reinforced concrete spacer according to any one of claims 1 to 6, wherein the spacer-forming circular pipe body is erected on the mounting table. When constructing a reinforced concrete structure, a method for manufacturing a reinforced concrete spacer for maintaining a concrete cover by maintaining a predetermined interval between a reinforcing bar and a mold disposed outside thereof,
A circular tube cutting step of cutting out a circular tube body for forming a spacer having a predetermined length from a long circular tube member;
A circular tube body placing step of standing on a placing table with one end of the circular tube body for spacer formation cut out to a predetermined length on the lower side;
A bolt support step for supporting the bolt in a state where one end of the bolt is exposed to the lower surface side of the lid, while inserting a shaft portion of the bolt into a through hole formed in the flat lid.
A ready-mixed concrete pouring step for pouring ready-mixed concrete from the upper end side of the circular tube body for spacer formation erected on the mounting table,
A lid mounting for mounting the lid supporting the bolt on the upper end of the spacer forming circular tube so that one end of the bolt is accommodated inside the spacer forming circular tube. And a method for manufacturing a reinforced concrete spacer.

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