JP2009235674A - Insulating coating reinforcement material embedded in concrete, and manufacturing method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an insulating coating reinforcement material embedded in concrete which is electrically insulated and coated with a coating layer formed of an electric insulating material with high electric insulation performance, and a manufacturing method for the insulating coating reinforcement material. <P>SOLUTION: A conductive reinforcement material for the concrete such as round steel and a deformed reinforcing bar which is arranged in a state of being embedded in the concrete is coated with the electric insulating material so as to form the coating layer 13 formed of the electric insulating material, and a surface of the coating layer 13 is roughened. The insulating coating reinforcement material 33 embedded in the concrete is manufactured by the manufacturing method. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a concrete reinforcing material obtained by applying an electrical insulating material to the surface of a concrete reinforcing material such as a round steel and a modified steel bar used for a concrete structure, and a method for manufacturing the same.

In concrete structures, concrete reinforcing materials such as round steel and modified steel bars that are embedded and used for reinforcement in concrete are used as they are without electrical insulation treatment.
However, electrical insulation treatment is applied to concrete in railroad concrete structures such as concrete track slabs or concrete sleepers or concrete roadbeds, concrete floor slabs, concrete guard panels, etc. If a plurality of metal reinforcing materials (non-insulating metal reinforcing materials) such as round steel and deformed steel bars are crossed and arranged in a loop shape such as a lattice shape on a plane, the loop shape portion When placed inside, electromagnetic induction may occur between the loop-shaped portion and an electric signal sent to a rail installed on the concrete structure, which may hinder the transmission of the electric signal.
More specifically, the non-insulating metal reinforcing materials are arranged in a loop shape so as to intersect with each other to form a loop-shaped electric circuit, and when this is arranged in a magnetic field, a current flows. Thus, electromagnetic induction may occur between the electric signal flowing in the rail and the transmission of the electric signal may be hindered.
As a countermeasure, a reinforcing material whose surface is electrostatically coated with epoxy resin powder, for example, an epoxy resin-coated reinforcing bar is used. However, such epoxy resin-coated reinforcing bars have several pinholes per meter and are not completely electrically insulating. Furthermore, when bending epoxy resin-coated reinforcing bars, they are painted on the bent parts. The epoxy resin may be lacerated or peeled off due to properties such as deformability, tensile strength, and adhesion strength with reinforcing bars, and the electrical insulation property may be lowered.
In addition, it is known that the reinforcing bars are coated with a thermoplastic resin only for the purpose of rust prevention of the deformed reinforcing bars embedded in the concrete (for example, see Patent Document 1). However, the above document is not a technique for preventing a closed circuit from being electrically formed when placed in concrete (see, for example, Patent Document 1).
JP 2006-348670 A

As described above, in order to electrically insulate the reinforcing material embedded in the concrete, the insulating material may be covered. However, if the insulating material has a pinhole, the insulating performance cannot be exhibited. And as concrete reinforcement, it is absolutely necessary to secure adhesion to concrete. For that purpose, the coating layer is required to be thin by a certain amount of insulating material and unevenness of the outer surface of the coating layer. However, if the coating layer is made too thin, the coating layer is damaged during assembly of concrete reinforcing materials such as reinforcing bars coated with an insulating material or during concrete placement, leading to a decrease in insulation performance.
The present invention makes it possible to form a coating layer made of an electrically insulating material having high electrical insulation on the surface of a concrete reinforcing material used by being embedded and arranged in concrete such as round steel and deformed steel bars, Prevents pinholes from occurring in the formed electrical insulation layer, which leads to deterioration of insulation, and maintains high electrical insulation without any tearing or peeling of the coating layer when bending the insulation coating material. An object of the present invention is to provide an insulating covering reinforcing material for embedding concrete, which can be electrically insulated, and a method for manufacturing the same.

In order to advantageously solve the above-mentioned problem, in the method for manufacturing an insulation covering reinforcing material for embedding concrete according to the first aspect of the invention, electrically conductive reinforcing material for concrete such as round steel and deformed steel bar embedded in concrete is electrically used. An electrical insulating material coating layer is formed by coating with an insulating material, and the surface of the electrical insulating material coating layer is roughened.
According to a second invention, in the method for producing an insulating covering reinforcing material for embedding concrete according to the first invention, the electrical insulating material is any one of thermoplastic resins typified by polyamide resin, polyethylene resin, polypropylene resin, and vinyl chloride resin. It is characterized by being.
According to a third aspect of the invention, in the method for manufacturing an insulating covering reinforcing material for embedding concrete according to the first or second aspect of the invention, the electrical insulating material is coated on the surface of the reinforcing material for concrete after being heated to a molten state in advance. It is characterized by doing.
According to a fourth aspect of the invention, in the method for producing an insulating covering reinforcing material for embedding concrete according to any one of the first to third aspects of the invention, on the surface of the covering layer made of an electrically insulating material coated on the surface of the reinforcing material for concrete, A spiral groove is formed.
According to a fifth invention, in the method for producing an insulating covering reinforcement material for embedding concrete according to any one of the first to fourth inventions, an abrasive is sprayed onto the surface of the covering layer made of the electrically insulating material with a sand blaster to obtain a rough surface. It is characterized by that.
According to a sixth aspect of the invention, there is provided an insulating covering reinforcing material for embedding concrete produced by the production method according to any one of the first to fifth aspects of the invention.

According to the first aspect of the present invention, a conductive concrete reinforcing material such as round steel or deformed steel bar embedded in concrete is coated with an electrical insulating material to form a coating layer made of the electrical insulating material, and the electrical insulating material Since the surface of the coating layer is made rough, it is possible to easily manufacture a coated concrete reinforcing material that is electrically insulating and has high adhesion to concrete.
According to the second invention, since the electrical insulating material is one of a thermoplastic resin typified by polyamide resin, polyethylene resin, polypropylene resin, and vinyl chloride resin, a coating layer made of electrical insulating material having high strength is formed. In addition, the concrete reinforcing material with less fear of peeling off the covering layer can be produced even in bending of the concrete reinforcing material. And it can be set as the reinforcement material for concrete which does not have a possibility that a pinhole may arise in the said coating layer.
According to the third invention, the electrical insulating material is coated on the surface of the concrete reinforcing material after being heated to a molten state in advance, so that it is a rod-shaped concrete reinforcing material or a plate-shaped concrete reinforcing material. Regardless, the coating layer made of an electrically insulating material can be easily formed.
According to the fourth invention, since the spiral groove is formed on the surface of the coating layer made of the electrical insulation material coated on the surface of the reinforcing material for concrete, the electrical insulation coating having a large adhesion locking effect with the concrete is formed. It is possible to easily manufacture a reinforcing material for concrete.
According to the fifth invention, the surface of the coating layer made of the electrical insulating material is made rough by spraying the surface of the coating layer made of the electrical insulating material with a sand blaster to make the surface rough. Thus, an effect of easily manufacturing an insulation-coated concrete reinforcing material that can reliably adhere to concrete can be obtained.
According to the sixth aspect of the present invention, there is provided an inexpensive concrete reinforcing material that is electrically insulated and has high adhesion to concrete, and such an insulating coated concrete reinforcing material can be used alone. Or, when embedded and used so as to intersect with non-insulating metal reinforcing material, even if the reinforcing material for concrete is arranged so as to intersect with each other to form a loop portion such as a rectangle, electrical A closed circuit is not formed. Therefore, it can be used as a member for preventing the formation of an electrical closed loop when it is embedded in a railway concrete structure. For this reason, if a concrete reinforcement covered with a coating layer made of such an electrical insulating material is used alone, or if it is embedded and arranged so as to intersect with a non-insulating metal reinforcing material, the electrical current that flows through the rails The possibility of electromagnetic induction occurring between the signals can be eliminated, and thus the possibility of obstructing the transmission of electrical signals can be eliminated.

  Hereinafter, it demonstrates still in detail based on embodiment which coat | covers an electrically insulating material on the surface of the reinforcing material for concrete of this invention.

FIG. 1A is a partially longitudinal front view showing an insulating covering reinforcing material for embedding concrete produced by the production method of the present invention, and FIG. 1B is a transverse plan view of FIG. FIG. 2 is a partially longitudinal front view showing an insulating covering reinforcing material for embedding concrete according to another embodiment of the present invention. 3A is a cross-sectional view taken along line AA of FIG. 1B, and FIG. 3B is an enlarged view of a part of FIG.
FIG. 4 (a) is a front view showing a concrete embedding reinforcing material made of deformed steel bar used as a concrete reinforcing material of the present invention, (b) is a bottom view of (a), and (c) is a diagram of (a). It is a side view. FIG. 5 is an explanatory diagram for explaining a method for producing an insulating covering reinforcing material for embedding concrete according to the present invention. FIG. 6 is a longitudinal front view showing a die portion used in FIG. FIG. 7 is a graph showing the results of testing the adhesion force of concrete with an insulating coating steel material for embedding concrete made of a deformed steel bar coated with electrical insulation by the method of the present invention.

  As shown in FIG. 4 (a), in a front view, convex portions 11 are formed on the surface of a concrete reinforcing material body 1a made of deformed steel bar 1 with an interval in an oblique direction so as to intersect the axial direction. Further, as shown in FIGS. 4A and 4B, ribs 12 are formed so as to project symmetrically in the axial direction. A convex portion 11a is formed between the ribs 12, and the convex portion 11b on the back side is shown in FIG. 1B or FIG. 4B with respect to the convex portion 11a on the front side. As described above, the front side convex portion 11a and the rear side convex portion 11b are formed in a semi-spiral shape in the longitudinal direction of the steel bar 1 so as to be symmetrically different in the bottom view. Is provided.

  On the outer peripheral surface of the deformed steel bar 1 as described above, an electrically insulating material made of a molten polyamide resin or the like is extruded to form a coating layer 13.

  Further, on the outer peripheral surface of the coating layer 13, fin-like convex portions 14 a and concave portions 14 b that are spirally extended in the axial direction are alternately formed. The spiral shape may be uniform in the axial direction, or may be a spiral shape in which the spiral direction alternates in the axial direction. As the spiral form, the fin-like convex part 14a and the concave part 14b may be spirals of other forms.

As described above, the deformed steel bar 1 is coated with the electrically insulating material, and the covering layer 13 made of the electrically insulating material is formed, so that the deformed steel bar 33 of the electrically insulating coating according to one embodiment of the present invention is configured. Further, as shown in FIGS. 2 and 3, the surface of the coating layer 13 in the deformed steel bar 33 with the above-mentioned electrical insulation coating is further provided with fin-like convex portions 14a and concave portions 14b alternately in the circumferential direction. It is preferable to form continuously in the direction. Furthermore, the fin-like convex part 14a and the concave part 14b formed on the surface of the covering layer 13 are attached to the concrete by intersecting at an intersecting angle α with respect to the axial direction of the deformed steel bar 1 in a spiral shape. Efficiency is improved. The crossing angle α is 0 ° to 80 °, and as the crossing angle α increases so as to approach 90 °, the adhesion strength between the deformed steel bar 1 and the concrete (particularly, in the case of the conventional example, The adhesive strength in the axial direction of the deformed steel bar 1 is high.
In the figure, 2a and 2b are a groove 2a between adjacent convex portions 11a and a groove 2b between convex portions 11b in the deformed steel bar 1.

  Next, as an embodiment of the concrete embedding reinforcing material for embedding concrete according to the present invention, a method of manufacturing the deformed steel bar 33 having the electrical insulating coating will be described with reference to FIG.

First, a short deformed steel bar 1 is placed on a feeding device 22 so that a plurality of short deformed steel bars 1 can be continuously fed in series. In the feeding device 22, for example, the deformed steel bar 1 of about 5 m is appropriately connected by a joint that can be cut, and is continuously fed out by the feeding device 23.
Next, the oxide film on the surface of the deformed steel bar 1 is removed by the sand blaster 24, and surface treatment is performed so that the coating layer 13 made of an electrically insulating material can be easily adhered.
The deformed steel bar 1 fed out is coated with an adhesive by an adhesive application device 25, and an electrically insulating material such as polyethylene resin or polyamide resin is melted by heating to about 200 ° C. with a heating device 26. 27 cross heads 28. The heating temperature at this time is a temperature determined by the adhesive applied to the deformed steel bar 1 and becomes a factor that affects the adhesive force of the coating layer 13.

  Next, a process of alternately forming a plurality of convex portions 14a and concave portions 14b on the outer surface of the coating layer 13 will be described with reference to FIG. An electrically insulating material made of polyamide resin or the like is heated and melted at about 200 ° C. to continuously form an insulating coating layer 13 on the surface of the deformed steel bar 1. The thickness of the coating layer 13 is preferably 0.2 mm to 0.4 mm. The thickness of the coating layer 13 at the concave portion 14b is preferably at least 0.1 mm. The merit of forming the coating layer 13 using the electrical insulating material made of the above-mentioned polyethylene resin or polyamide resin is that the adhesion to the concrete is ensured while ensuring the insulation performance, and the deformed steel bar 1 is bent. There is an advantage that it is hard to be scratched.

In order to form the coating layer 13, as one form of the forming die 29 provided in the cross head 28, as shown in FIG. 6, as shown in FIG. Thus, the concave and convex portions 15 formed by alternately forming the arc-shaped convex portions 15a and the fin-shaped concave portions 15b in the inner circumferential direction of the annular die are continuously formed in the member axial direction.
Further, the sprocket 3 is fixed to the end of the annular die 29, and the base end of the annular die 29 is rotatably supported on the cross head 28 side as shown in FIG. 5 (b). Yes. A chain 9 or the like is wound around the sprocket 3 of the annular die 29 and the drive sprocket 5 in the drive motor 4 installed on the main body side of the extrusion molding machine 27. By rotating or rotating the annular die 29, the coating layer 13 having a spiral groove on the outer surface in the longitudinal direction of the member can be formed.

  The coating layer 13 whose outer surface is formed by the concave and convex portions 15 is a groove between the fin-shaped convex portions 14a in the convex and concave portions 14, that is, the shape and depth of the concave portions 14b and the axial direction of the coated steel material. The adhesion strength with concrete can be adjusted by the inclination angle. The cross-sectional shape of the concave portion 14b may be a semicircular groove, a rectangular groove, or a V-shaped groove. The depth of the concave portion may be 0.1 mm to 0.15 mm, and the inclination angle with the central axis of the deformed steel bar 1 α may be 0 ° to 80 °.

  The coating layer 13 is formed on the outer side of the deformed steel bar 1 by the molten electrically insulating resin injected from the forming die 29 as described above. The outer peripheral surface of the covering layer 13 is subjected to fin-like uneven processing and extruded, and as shown in FIGS. 3A and 3B, the outer peripheral surface of the covering layer 13 extends in the longitudinal direction of the covering layer 13. A coated variant in which a plurality of deformed steel bars 1 are continuously coated in a state in which continuous fin-shaped convex portions 14a and concave portions 14b are continuously formed in the axial direction of the coating layer 13 alternately in the circumferential direction. The steel bar 1a (see FIG. 5) is obtained. In addition, when the convex-shaped part 11 in the deformed steel bar 1 has an arc-shaped cross section, the coating layer 13 is formed as shown in FIG.

  The continuous deformed steel bar 1a covered with the coating layer 13 injected from the forming die 29 as described above, that is, the continuous electrically insulating coated deformed steel bar 1a is then cooled by the cooling device 30, and then the electrical insulation. The coated deformed steel bar 1a is cut from the outside of the coating layer 13 by the cutting machine 11 from the outside of the coating layer 13 to form a deformed steel bar 33 of about 5 m covered with the coating layer 13, and the finished product base 32 Sent to the top.

  The deformed steel bar 33 manufactured by coating the deformed steel bar 1 with the electrically insulating material in this way is coated with the coating layer 13 so that the surface of the coating layer 13 is covered with the member. Convex recesses 14 having fin-like convex portions 14a and recesses 14b that are continuous in the longitudinal direction are formed, and this convex recesses 14 can improve adhesion to concrete. In addition, although the groove parts 2a and 2b between the convex-shaped parts 11 become a little smooth because the coating layer 13 is coat | covered, the effect of the adhesive force improvement by the said convex-concave part 14 is large.

If it is necessary to further improve the adhesion of the deformed steel bar 33 with electrical insulation coating to the concrete, the surface of the coating layer 13 may be roughened by spraying an abrasive with a sand blaster (not shown). Good.
Therefore, the surface of the electrically insulating material covered with the reinforcing material such as the deformed steel bar 1 may be roughened by spraying an abrasive with a sand blaster.
The hardened outer surface of the coating layer 13 may be directly polished to be a roughened surface, or an abrasive may be sprayed and adhered to the semi-molten coated layer 13 to roughen the surface. .
As a polishing agent in these cases, use of a ceramic type having a particle size of No. 46 (350 to 420 μm) is sufficient because the strength is high.
When the hardened outer surface of the coating layer 13 is directly polished to be a rough surface, the roughness of the rough surface may be about 10 μm to 30 μm, and if it is less than 10 μm, the adhesion effect is low. This is not preferable. Further, when the hardened outer surface of the coating layer 13 is flat, it may be 30 μm or more, but at least the thickness described above is maintained.
When the abrasive is sprayed by the sand blaster in this way, in addition to the coating layer 13 having the fin-like convex portions 14a as described above, the outer surface of the coating layer 13 that does not have the uneven portions on the outer surface of the coating layer 13 is used. You may make it make the surface rough by spraying on the surface.

  In addition, although this embodiment showed the example of the deformed steel bar, it can be applied to other concrete reinforcing materials in the same manner as the example.

FIG. 7 is a graph showing the results of a concrete pull-out test for confirming the adhesion strength with concrete in the deformed steel bar 33 of the electrical insulation coating of the present invention.
The above concrete pull-out test is a standard in the “Design Guidelines for Reinforced Concrete Using Epoxy Resin Coated Reinforcing Bars” by the Japan Society of Civil Engineers, and is a test method for adhesion strength of epoxy resin coated reinforcing bars (JSCE-E516- 2003).
This standard stipulates that the maximum adhesion stress level of coated epoxy resin coated reinforcing bars must be 85% or more of unpainted deformed steel bars.
As shown in FIG. 9, the maximum adhesion stress degree in the deformed steel bar 33 of the electrically insulating coating manufactured by the manufacturing method of the present invention exceeds 95% of that of the uncoated steel bar, and has a high adhesion. Was confirmed. Reference numeral 16 is concrete.

Further, the salt spray test (JSCE-E518-2003) stipulates that the average rusting rate is 0.5% or less, but the corrosion resistance of the deformed steel bar 33 of the electrical insulation coating of the present invention is described above. As a result of testing by the method, the average rusting rate was 0.5% or less. Therefore, it was confirmed that the deformed steel bar 33 of the electrically insulating coating manufactured by the manufacturing method of the present invention has high corrosion resistance that satisfies the above-mentioned regulations.
In addition, as a result of inspecting the covering layer 13 in accordance with a pinhole inspection (JSCE-E512-2003 as a quality standard for epoxy resin-coated reinforcing bars), whether or not pinholes are detected. The reference is 5 pieces / m or less, but no pinhole was detected in the present invention. Therefore, it was confirmed that the deformed steel bar 33 of the electrically insulating coating manufactured by the manufacturing method of the present invention has a high insulating property that satisfies the above definition.

(Embodiment 2)
Next, an embodiment in which the deformed steel bar 33 with the electrically insulating coating manufactured by the above manufacturing method is used for the track slab will be described with reference to FIG. 8A and 8B show a track slab in which the insulating covering steel material for embedding concrete according to the present invention using a deformed steel bar is embedded, and FIG. 8A is a plan view and FIG. 8B is a front view.

  As shown in FIG. 8, the concrete track slab 6 of the illustrated embodiment is a reinforced concrete plate having a length of 5 m, a width of 2 m, and a thickness of 0.19 m. Two rails 7 and 8 are installed on the concrete track slab 6 symmetrically from the central axis. In the figure, reference numeral 17 denotes an embedded plug (female screw member).

In order to endure the load of the vehicle, although not shown in the figure, generally, an uncoated deformed steel bar is embedded in the track slab as a reinforcing material for concrete. However, when a high-frequency signal of about 2000 Hz passes through the rail, an induced current may be generated in a loop-shaped circuit formed of the longitudinal deformed steel bar and the lateral deformed steel bar, which may hinder the transmission of the electric signal.
In order to eliminate such obstacles, in this second embodiment, as shown in FIGS. 8 and 9, all the deformed steel bars embedded in the concrete track slab 6 or embedded in the longitudinal direction are arranged. Only the modified steel bars or all the modified steel bars that are embedded and arranged in the lateral direction are shown in the form in which they are embedded and arranged using the modified steel bars 33 of electrical insulation coating.

  FIG. 9 shows an arrangement of the concrete-embedded insulating covering reinforcing material 33 according to the present invention in which a deformed steel bar is used for the concrete track slab 6, wherein (a) is a plan view and (b) is a longitudinal front view. FIG. Reference numeral 16 in the figure is concrete.

  By disposing the deformed steel bar 33 with the electrical insulation coating in this way, the deformed bar steel 33 with the electrical insulation coating is embedded and disposed in at least one of the longitudinal direction and the horizontal direction, so that the uncoated deformed bar steels are directly connected to each other. Since no contact is made and a loop-like electric circuit is not formed, an induced current is generated, and there is no obstacle to transmission of an electric signal.

Regarding the concrete track slab 6 of the following (1) to (3) including the concrete track slab 6 in which the deformed steel bar 33 of the electrical insulation coating according to the present invention is embedded, the influence of the reinforcing material for concrete on the high-frequency electrical signal passing through the rail In order to investigate, the inductance (L) and impedance (R) between the two rails 7 and 8 installed in each concrete track slab 6 are measured by a measuring device (not shown) having a frequency of 2000 Hz. Table 1 below shows the relative deviation between these measured values and the measured values L ₀ and R ₀ between the two rails 7 and 8 installed on the insulating plate on the concrete track slab 6.
(1) A concrete track slab in which the deformed steel bar 1 is uncoated in both the longitudinal direction and the lateral direction (slab width direction) of the concrete track slab (see FIG. 10).
(2) A concrete track slab in which the longitudinal direction of the concrete raceway slab is an uncoated deformed steel bar 1 and the longitudinal direction is a concrete raceway slab in which a coated deformed steel bar 18 made of a conventional epoxy resin powder coating in which pinholes are formed is embedded (FIG. reference).
(3) A concrete track slab in which the lateral direction of the concrete track slab is an uncoated deformed bar 1 and the longitudinal direction is embedded with a coated deformed bar made of the electrically insulating coating layer 13 of the present invention.

  In the present invention, the electrically insulating material for forming the coating layer 13 is preferably a thermoplastic resin, and for example, any one of thermoplastic resins typified by polyamide resin, polyethylene resin, polypropylene resin, and vinyl chloride resin is used. When the deformed steel bar 33 is coated with the deformed steel bar 1 by extrusion molding, the same performance as in Table 1 is exhibited. Therefore, you may make it form the thermoplastic resin coating layer 13 with well-known thermoplastic resins other than the above.

  From Table 1 above, when the irregular steel bar 33 with electrical insulation coating is used for the concrete track slab 6, the relative inductance deviation amount is larger than the ordinary uncoated irregular steel bar and epoxy resin coated reinforcing bar, and the relative impedance deviation amount is Get smaller. That is, it has been found that the use of the modified steel bar 33 of the electrical insulation coating according to the present invention reduces the obstacles to the high-frequency electrical signal passing through the rails 7 and 8 of the concrete track slab 6.

  Such a concrete reinforcing material coated with the electrical insulating material of the present invention, that is, a concrete reinforcing material embedded in and used in concrete such as round steel and deformed bar steel, and the surface of the concrete reinforcing material coated with the electrical insulating material has high electrical conductivity on the surface. It has a coating layer made of an electrically insulating material having insulation properties, and there is no risk of pinholes leading to a decrease in insulation in the electrical insulating coating layer. Also, when the insulating layer coating reinforcing material is bent, the coating layer There is no risk of tearing or peeling, and high electrical insulation can be maintained.

  As in the concrete track slab, the coated concrete reinforcing material manufactured by the method for manufacturing an insulating covering reinforcing material for embedding concrete according to the present invention is replaced with an uncoated reinforcing material such as an uncoated reinforcing bar, and a concrete structure When embedded in an object, electrical insulation is high, so that it is possible to prevent an electric signal transmission failure due to the occurrence of electrical induction and magnetic induction in a concrete structure.

  The coated concrete reinforcing material manufactured by the method for manufacturing an insulating covering reinforcing material for embedding concrete according to the present invention is embedded in a concrete structure instead of an uncoated reinforcing material such as an uncoated reinforcing bar, thereby providing concrete. It becomes possible to suppress the corrosion of the reinforcing material.

  In the case of the above embodiment, the case where the deformed steel bar 1 is coated with the electrical insulating material has been described. However, when the present invention is carried out, in addition to the deformed steel bar 1, a reinforcing material such as a reinforcing bar, a deformed steel bar, or a steel plate is coated. You may make it do. When covering the rod-shaped reinforcing material, the extrusion coating means as in the above embodiment may be adopted. When covering the plate-shaped reinforcing material, the plate-shaped reinforcing material is placed in the mold and in a molten state. A thermoplastic resin may be filled and solidified.

  In the above embodiment, the concrete track slab has been illustrated and described. However, when the present invention is implemented, the concrete guard panel installed near the rail such as a side wall or a concrete sleeper installed on the side of the track is used. As the reinforcing steel material to be embedded and disposed, a thermoplastic resin-coated steel material may be used as in the above embodiment.

(A) is a partially longitudinal front view showing an example of an insulating covering reinforcing material for embedding concrete manufactured by the manufacturing method of the present invention, and (b) is a cross-sectional plan view of (a). (A) is the front view of Fig.1 (a), (b) is a partially longitudinal front view which shows the insulation coating reinforcement material for concrete embedding of the other form of this invention. (A) is the sectional view on the AA line of FIG.1 (b), (b) is a figure which expands and shows a part of (a), (c) is the BB sectional view of FIG.1 (a). FIG. (A) is a front view showing a reinforcing material for embedding concrete made of deformed steel bar used as a reinforcing material for concrete of the present invention, (b) is a bottom view of (a), and (c) is a CC of (b). It is line sectional drawing. (A) is explanatory drawing in order to demonstrate the manufacturing method of the insulation covering reinforcement material for concrete embedding of this invention, (b) is a figure which shows the form of the apparatus in the case of forming a helical groove | channel in the outer peripheral surface of a coating layer. It is. It is a vertical front view which takes out and shows the die part used in FIG. It is a graph which shows the result of having tested the adhesive force with the concrete of the insulation coating reinforcement material for concrete embedding which consists of a deformed steel bar which carried out electrical insulation coating by the method of this invention. The track | orbit slab which embedded and arrange | positioned the insulation covering reinforcement material for concrete embedding of this invention using a deformed steel bar is shown, Comprising: (a) is a top view, (b) is a front view. The arrangement | positioning form of the insulation coating reinforcing material for embedding | conclusion of concrete of this invention which embedded and arranged the deformed steel bar in the track slab is shown, Comprising: (a) is a top view, (b) is a longitudinal front view. The arrangement | positioning form of the conventional concrete embedding reinforcement which embedded and arrange | positioned the deformed steel bar in the raceway slab is shown, Comprising: (a) is a top view, (b) is a longitudinal front view. The arrangement | positioning form of the conventional reinforcing material for embedding | concrete concrete which embed | disposed and arrange | positioned the deformed steel bar which coated the epoxy resin electrostatic powder to the track | orbit slab is shown, Comprising: (a) is a top view, (b) is a longitudinal front view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Profile bar 1a Reinforcement body for concrete 2a Groove 2b Groove 3 Driven sprocket 4 Drive motor 5 Drive sprocket 6 Concrete track slab 7 Rail 8 Rail 9 Chain 11a Convex part 11b Convex part 12 Rib 13 Cover layer 14 Fin-like irregular Part 14a Fin-shaped convex part 14b Concave part 15 Concave part 16 Concrete 17 Embedded plug 22 Feeding device 23 Feeding device 24 Sand blaster 25 Adhesive application device 26 Heating device 27 Extruder 28 Crosshead 29 Molding die 30 Cooling device 31 Cutting machine 32 Finished product stand 33 Deformed steel bar with electrical insulation coating 34 Regular deformed steel bar

Claims (6)

  A conductive reinforcing material for concrete, such as round steel and deformed steel bars, embedded in concrete is covered with an electrical insulating material to form an electrical insulating material coating layer, and the surface of the electrical insulating material coating layer is roughened. A method for producing an insulating covering reinforcing material for embedding concrete, characterized by comprising a surface.   2. The insulation covering reinforcing material for embedding concrete according to claim 1, wherein the electrical insulating material is one of a thermoplastic resin typified by a polyamide resin, a polyethylene resin, a polypropylene resin, and a vinyl chloride resin. Production method.   The method for producing an insulating covering reinforcing material for embedding concrete according to claim 1 or 2, wherein the surface of the reinforcing material for concrete is covered with the electrical insulating material after being heated to a molten state in advance.   The insulating coating for embedding concrete according to any one of claims 1 to 3, wherein a spiral groove is formed on the surface of the coating layer made of an electrically insulating material coated on the surface of the reinforcing material for concrete. A method of manufacturing a reinforcing material.   The method for producing an insulating covering reinforcing material for embedding concrete according to any one of claims 1 to 4, wherein an abrasive is sprayed onto the surface of the coating layer made of an electric insulating material with a sand blaster to make it rough.   An insulating covering reinforcement material for embedding concrete produced by the production method according to claim 1.

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