JP2013040508A - Cylindrical member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cylindrical member showing information for proper use even if embedded into a concrete or other materials in use.SOLUTION: A cylindrical member 10 includes a cylindrical part 20 and end faces 22. The end faces 22 are provided at one end and at the other end of the cylindrical part 20. A recessed part 32 is provided in at least one of the end faces 22. The recessed part 32 has a grooved portion. The grooved portion extends straight in the radial direction of the end face 22. The grooved portion 40 is narrower as being closer to the outer periphery of the cylindrical part 20. The cylindrical member 10 is formed of cast iron. The cylindrical member 10 further includes a mortar-filling protruded part 24 and a mortar-discharging protruded part 26.

Description

  The present invention relates to a cylindrical member used by being embedded in various substances including concrete.

  Patent document 1 discloses the joint for deformed reinforcing bars embedded in the column made from precast concrete. One end of the deformed reinforcing bar joint is thinned over a predetermined length from the end face. An internal thread portion is formed on the inner periphery of the narrowed portion. The other end of the deformed reinforcing bar joint is a reinforcing bar insertion opening. The inner diameter of the reinforcing bar insertion port is larger than the inner diameter of the female screw portion described above. A convex portion is formed adjacent to the female screw portion at a position closer to the center of the deformed reinforcing bar joint than the female screw portion. This convex part protrudes in the radial direction from the outer peripheral surface of the joint for deformed reinforcing bars. A first hole is formed in the convex portion. A convex portion is also formed on the outer peripheral surface of the other end of the deformed reinforcing bar joint (the end on the side where the reinforcing bar insertion opening is provided). This convex part is formed in the position slightly separated from the other end surface of the joint for deformed reinforcing bars. This convex portion also projects radially from the outer peripheral surface of the deformed reinforcing bar joint. A second hole is formed in the convex portion. The second hole is oriented in the same direction as the first hole. When the first hole and the second hole are viewed from the axial direction of the deformed reinforcing bar joint, they overlap. The joint for deformed reinforcing bars disclosed in Patent Document 1 can connect two deformed reinforcing bars arranged on the same axis. Incidentally, the above-mentioned “radial direction” refers to a direction from the center toward the outer periphery in the plane of the disk. The meaning of “radial direction” is the same in the following description.

JP 2009-249847 A

  The joint for deformed reinforcing bars disclosed in Patent Document 1 has a problem that deformed reinforcing bars that are not suitable for the deformed reinforcing bar joint may be inserted. This problem often surfaces when used embedded in concrete or other materials. Often, a person who sees a deformed bar joint cannot immediately perceive a deformed bar suitable for the deformed bar joint. Such a problem can be easily solved by indicating somewhere information indicating a deformed reinforcing bar suitable for the deformed reinforcing bar joint. An example of a location suitable for the purpose of showing the information is the outer peripheral surface of the tubular portion of the deformed reinforcing bar joint. However, for example, when a deformed reinforcing bar joint is embedded in a concrete or other substance during use, the information is difficult to see even if the information is shown on the outer peripheral surface of the tubular portion of the deformed reinforcing bar joint. If the information is difficult to see, compared to the case where the information is easy to see, there is a high possibility that a deformed reinforcing bar that is not suitable for the deformed reinforcing bar joint is inserted into the deformed reinforcing bar joint. This problem is not limited to the joints for deformed reinforcing bars, but is a problem that applies to general tubular members embedded in concrete or other materials during use.

  An object of the present invention is to provide a cylindrical member capable of showing information for proper use even when embedded in concrete or other substances during use.

  The piping structure of the present invention will be described with reference to the drawings. Note that the use of the reference numerals in the figure in this column is intended to assist understanding of the contents of the invention, and is not intended to limit the contents to the illustrated range.

  In order to achieve the above object, according to an aspect of the present invention, the tubular member 10 includes a tubular portion 20 and an end surface 22. End faces 22 are respectively provided at one end and the other end of the cylindrical portion 20. A recess 32 is provided on at least one of the end faces 22.

  Even if the cylindrical member 10 is embedded in the concrete or other material, the cylindrical member 10 may be embedded even if the cylindrical member 10 is embedded in the concrete or other material. Can be used properly. The tubular member 10 is often embedded in concrete or other material in order to provide a passage that leads from the mass of such material to the outside. When the cylindrical member 10 is embedded in such a mass of material for that purpose, the end face 22 of the cylindrical member 10 is exposed on the surface of the mass of concrete or other material. If the end face 22 is not exposed, the passage as described above cannot be provided. Thereby, if the information mentioned above is displayed on the end surface 22 of the cylindrical member 10, the cylindrical member 10 can be used appropriately.

  Further, it is desirable that the above-described recess 32 has the groove 40. The groove portion 40 extends straight in the radial direction of the end face 22.

  An example of a specific method for displaying the information described above is a method of embossing such information on the end face 22 of the cylindrical member 10. However, this method is not easy. As a method for embossing information, there are a method of cutting the end face 22 of the tubular member 10 and a method of casting the tubular member 10 using a mold. Cutting takes a lot of time to work. Casting may not produce a mold. These make it difficult to highlight information. The reason why the mold cannot be manufactured is that a core is required to manufacture the cylindrical member. When manufacturing a cylindrical member using a core, a part of end surface of a cylindrical member is formed with a core. The remaining part of the end face is formed by the outer mold. If information for properly using the cylindrical member 10 is to be formed by the core, it is necessary to form a recess for forming the above-described relief in the core. However, the core is for forming the inner peripheral surface of the cylindrical member. It is difficult to form the inner peripheral surface of the cylindrical member and the above-described relief with a core at once. In particular, it is difficult to manufacture a core capable of such a purpose. If an attempt is made to manufacture such a core, the core cannot be removed from the mold for manufacturing the core. If the casting is performed using the outer mold for forming the outer peripheral surface of the cylindrical part and the outer mold for forming only the core and the relief part, the above-described relief can be performed, but only the relief part is formed. It takes extra time to manufacture the outer mold to do this. On the other hand, when the recessed part 32 is provided in the end surface 22, the core which can form the groove | channel 40 mentioned above at least among the recessed parts 32 can be manufactured easily. Thus, if the information described above is indicated by any one of the position, the number, and the arrangement of the recesses 32, the information described above can be easily indicated.

  Alternatively, it is desirable that the width of the groove 40 described above is narrower as the position is closer to the outer periphery of the tubular portion 20. When the width of the groove portion 40 is closer to the outer periphery of the tubular portion 20, the core 90 is easier to manufacture than when the width is not so. Thereby, the information mentioned above can be shown more easily.

  Moreover, it is desirable that the cylindrical member 10 described above is made of cast iron. Moreover, it is desirable that the above-described tubular member 10 further includes protrusions 24 and 26. The protruding portions 24 and 26 are provided on the outer periphery of the cylindrical portion 20.

  According to the present invention, it is possible to show information for proper use even when embedded in concrete or other substances during use.

It is a perspective view which shows the coupling for deformed reinforcing bars concerning one Embodiment of this invention. It is an enlarged view of the partial end surface of the joint for deformed reinforcing bars concerning one embodiment of the present invention. It is sectional drawing of the recessed part of the joint for deformed reinforcing bars concerning one Embodiment of this invention. It is a perspective view of the edge part of the core for manufacturing the coupling for deformed reinforcing bars concerning one Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

[Structure of deformed bar joint]
FIG. 1 is a perspective view of a deformed reinforcing bar joint 10 according to the present embodiment. The configuration of the deformed reinforcing bar joint 10 according to the present embodiment will be described with reference to FIG.

[Structure of deformed bar joint]
The joint for deformed reinforcing bars 10 according to the present embodiment is embedded in concrete. The deformed reinforcing bar joint 10 is connected to a deformed reinforcing bar (not shown). The deformed reinforcing bar joint 10 according to the present embodiment includes a cylindrical portion 20, an end surface 22, a mortar injection protrusion 24, and a mortar discharge protrusion 26. The deformed bar joint 10 according to the present embodiment is a cast iron tubular member integrally formed by casting.

  The shape of the cylindrical part 20 is cylindrical. A plurality of ribs 80 are provided on the inner peripheral surface of the cylindrical portion 20. The end surfaces 22 are provided at both ends of the cylindrical portion 20. The end surface 22 according to the present embodiment is a plane orthogonal to the central axis of the cylindrical portion 20. The end face 22 will be described later. The mortar injection protrusion 24 and the mortar discharge protrusion 26 are provided on the outer periphery of the cylindrical portion 20. The mortar injection protrusion 24 serves as a mortar injection port into the cylindrical portion 20. The mortar injection protrusion 24 has an injection communication path 70. The injection communication path 70 communicates the outside and the inside of the cylindrical portion 20. The mortar enters the cylindrical portion 20 through the injection communication passage 70. The mortar discharge protrusion 26 serves as a mortar discharge port from the inside of the cylindrical portion 20. The mortar discharge protrusion 26 has a discharge communication path 72. The discharge communication path 72 also connects the outside and the inside of the cylindrical portion 20. The mortar goes out of the cylindrical portion 20 through the discharge communication path 72.

  An opening 30 is provided in the end face 22. The deformed reinforcing bar enters the cylindrical portion 20 via the opening 30. If the mortar is filled into the cylindrical portion 20 while the deformed reinforcing bar is in the cylindrical portion 20, the deformed reinforcing bar joint 10 and the deformed reinforcing bar are integrated after the mortar is cured.

  The end surface 22 is also provided with a recess 32. The concave portion 32 is exposed on the surface of the concrete when the deformed reinforcing bar joint 10 is embedded in the concrete. The deformed reinforcing bar joint 10 according to this embodiment is embedded in concrete so as to be so. In the case of the present embodiment, the shape, size, number, or arrangement of the recesses 32 are determined based on the size and type of the deformed reinforcing bar joint 10. Depending on the size and type of the deformed reinforcing bar joint 10, the type and thickness of the deformed reinforcing bar connected to the deformed reinforcing bar joint 10 are automatically determined. Thereby, according to the shape of the recessed part 32, its magnitude | size, the number, or the arrangement | positioning, the kind and thickness of the deformed reinforcing bar connected with the deformed reinforcing bar joint 10 become clear. As a result, the shape, the size, the number, or the arrangement of the recesses 32 is a mark indicating the type and thickness of the deformed reinforcing bar corresponding to the deformed reinforcing bar joint 10.

[Concave form]
FIG. 2 is an enlarged view of the end face 22 according to the present embodiment. FIG. 3 is a cross-sectional view of the recess 32. With reference to FIG. 2 and FIG. 3, the form of the recessed part 32 concerning this embodiment is demonstrated.

  The concave portion 32 according to the present embodiment includes a groove portion 40 and a tip portion 42. As apparent from FIG. 2, the groove portion 40 extends straight in the radial direction of the tubular portion 20. The tip portion 42 is provided at the tip of the front side of the groove portion 40 when viewed from the outer peripheral surface of the cylindrical portion 20. That is, the distal end portion 42 is provided at the back of the groove portion 40 when viewed from the center of the tubular portion 20.

  The groove part 40 is constituted by a first opposite side part 50, a second opposite side part 52, and a bottom part 60. The first opposite side portion 50 and the second opposite side portion 52 face each other. The first side 50 and the second side 52 are flat side walls of the groove 40. The distance between the first opposite side portion 50 and the second opposite side portion 52, that is, the width of the groove portion 40 is narrower as it is closer to the outer periphery of the tubular portion 20. The bottom portion 60 is closer to the end surface 22 as it is closer to the outer periphery of the tubular portion 20. That is, the groove portion 40 is shallower at a portion closer to the outer periphery of the tubular portion 20.

  As described above, the distal end portion 42 is provided at the end of the groove portion 40 when viewed from the outer peripheral surface of the tubular portion 20. The tip portion 42 has a tip portion of the groove portion 40 as seen from the outer peripheral surface of the cylindrical portion 20 tapered. The tip portion 42 has a tip inner peripheral surface 54. The tip inner peripheral surface 54 is a curved surface that surrounds the end of the groove 40. As is apparent from FIG. 3, the boundary portion 66 between the tip inner peripheral surface 54 and the bottom portion 60 is a curved surface.

[Manufacturing process]
As described above, the deformed reinforcing bar joint 10 according to the present embodiment is a cast iron tubular member integrally formed by casting. The specific manufacturing process will be described below.

  The deformed reinforcing bar joint 10 according to this embodiment is manufactured according to the manufacturing process described below. The first step is sand mold production. The second step is sand mold assembly. The third step is pouring molten metal into the sand mold. The fourth step is sand mold destruction. The fifth step is machining.

  The sand mold is manufactured through the following procedure. The first procedure is to mix sand and binder. The second procedure is to fill the wooden mold with a mixture of sand and binder. The third procedure is to cure the mixture in the mold. The fourth procedure is to remove the cured mixture from the wooden mold. The extracted mixture is a sand mold. In the case of this embodiment, an outer mold and a core are manufactured as sand molds.

  FIG. 4 is a perspective view of the end portion of the core 90. In FIG. 4, a portion of the core 90 for forming the end face 22 of the deformed reinforcing bar joint 10 is illustrated. As shown in FIG. 4, the core 90 is provided with a convex portion 92. This convex part 92 becomes the concave part 32 of the joint 10 for deformed reinforcing bars.

  Since other processes are well known, detailed description thereof will not be repeated here.

[Procedure for connecting deformed bars]
The method of using the deformed reinforcing bar joint 10 according to this embodiment is the same as that of the well-known deformed reinforcing bar joint. Therefore, detailed description thereof will not be repeated here.

[Explanation of effects according to this embodiment]
As described above, when the deformed reinforcing bar joint 10 according to the present embodiment is used, information for proper use can be shown even if it is embedded in concrete or other substances during use. This is possible because, when embedded in concrete or other material, information for properly using the deformed reinforcing joint 10 is exposed on the surface of the concrete or other material. In the present embodiment, the information is the concave portion 32 of the end face 22.

  In the present embodiment, the recess 32 has a groove 40. The groove portion 40 extends straight in the radial direction of the tubular portion 20. If the deformed reinforcing steel joint 10 is formed by casting, it is easier to form the groove portion 40 than when the tubular portion 20 does not extend straight in the radial direction. Thereby, regarding the groove part 40, it can be said that information for appropriately using the member can be easily shown in the member formed by casting. This effect is further enhanced by the recess 32 having the tip 42 in addition to the groove 40.

  Further, in the case of the present embodiment, the width of the groove 40 is narrower as the position is closer to the outer periphery of the tubular portion 20. If the deformed reinforcing steel joint 10 is formed by casting, it is easier to form the groove 40 than when the width of the groove 40 is not as described above. Thereby, regarding the groove part 40, it can be said that information for appropriately using the member can be easily shown in the member formed by casting. This effect is further enhanced by the recess 32 having the tip 42 in addition to the groove 40. Further, this effect is further enhanced by the shallow bottom 60.

[Modification]
In addition, the Example disclosed this time is an illustration in all the points. The scope of the present invention is not limited based on the above-described embodiments, and it is needless to say that various design changes may be made without departing from the spirit of the present invention.

  For example, the cylindrical member according to the present invention is not limited to the deformed reinforcing bar joint. The cylindrical member concerning this invention should just be embedded in a concrete or other substance in the case of use. Moreover, the external shape of the cylindrical member concerning this invention is not limited to a cylindrical shape.

  Moreover, the raw material of the cylindrical member concerning this invention is not limited to cast iron. Examples of the material of the cylindrical member according to the present invention include an aluminum alloy and a magnesium alloy. Moreover, the manufacturing method of the cylindrical member concerning this invention is not limited to casting. An example of a method for producing a cylindrical member according to the present invention is sintering.

  Moreover, the form of the recessed part 32 is not limited to what was mentioned above. Therefore, the form of the tip end portion 42 is not limited to that described above. The recess 32 may not have the tip 42. In this case, the end portion of the concave portion 32 reaches the outer peripheral surface of the cylindrical portion 20. The form of the groove 40 is not limited to that described above. For example, the width of the groove 40 may be constant. The depth of the bottom 60 viewed from the surface of the end face 22 may be constant.

  Further, the shape of the end face 22 may be different between one end and the other end of the tubular portion 20.

10 ... Joint for deformed reinforcing bar,
20 ... cylindrical part,
22 ... end face,
24. Projection for injecting mortar,
26. Projection for discharging mortar,
30 ... Opening,
32 ... concave,
40 ... groove,
42 ... the tip,
50 ... first side,
52 ... the second opposite side,
54 ... inner peripheral surface of the tip,
60 ... bottom,
66 ... boundary part,
70 ... Inlet communication passage,
72 ... discharge passage,
80 ... ribs,
90 ...
92 ... convex portion,

Claims (5)

A cylindrical member provided with a cylindrical part and an end face, wherein the end face is provided at one end and the other end of the cylindrical part,
A cylindrical member characterized in that a recess is provided in at least one of the end faces.   The cylindrical member according to claim 1, wherein the concave portion has a groove portion that extends straight in a radial direction of the end face.   The cylindrical member according to claim 2, wherein a width of the groove portion is narrower as a position is closer to an outer periphery of the cylindrical portion.   The cylindrical member according to any one of claims 1 to 3, wherein the cylindrical member is made of cast iron.   The said cylindrical member is further provided with the protrusion part provided in the outer periphery of the said cylindrical part, The cylindrical member in any one of the Claims 1 thru | or 4 characterized by the above-mentioned.

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