JP2005068676A - Road sign pole and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a road sign pole capable of easily visualizing a pole section with interior lighting by completing its life without changing any battery member in the case it is installed on the road to use and greatly improving such an inconvenience that lighting does not turn on in comparison with the conventional one and its manufacturing method. <P>SOLUTION: The road sign pole 10 comprises the hollow pole section 12 consisting of thermoplastic elastomer and a base section 14 consisting of reaction hardening resin fixed to the lower end section of the pole section 12 and for erecting the pole section 12, and it is so constituted that a plurality of LED 15 are arranged to the base section 14 facing the inside of a hollow section of the pole section 12, solar cells 26 are arranged to the upper surface of the outside of the pole section 12 of the base section 14, a capacitor 18 for accumulation of electricity and a circuit substrate 16 are stored in a recess section 21 formed in the lower surface side of the base section 14 and that a joint sealing is made by the sealing reaction hardening resin 20. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an internal illumination type flexible road sign pillar (line-of-sight sign pillar) installed on the road surface of a road or a parking lot, and a method for manufacturing the same.
[0002]
[Prior art]
On road surfaces of roads and parking lots, road sign pillars (line-of-sight sign pillars) are installed to indicate the presence of center lines, shoulders, courses, curves, etc., especially at night. As such a road sign pillar, a hollow pole part for a person to visually recognize and a base part for fixing this to the road surface are fixed, and a light source is provided inside the hollow to turn on the light source at night. A technique for making the pole part easily visible by internally illuminating the pole part is known (for example, Patent Documents 1 and 2).
[0003]
The road sign pillar described in Patent Document 1 is excellent in self-restoration against deformation caused by stepping on a vehicle, and is intended to protect a light source mounted to enhance visibility from an impact or load. The portion is formed of a hollow rubber-like elastic body, and an irradiation light lamp as a light source is embedded in the base portion. In the road sign pillar described in Patent Document 1, the base portion is composed of a pedestal and a pressing ring that is fitted to the pedestal. As the base portion constituting material, a thermoplastic polyurethane elastomer and a cast type (reaction curable) polyurethane are exemplified as suitable ones.
[0004]
Patent Document 2 aims to improve the visibility of the road sign pillar described in Patent Document 1, and is an irradiation light lamp at the bottom of the road sign pillar having the same configuration as Patent Document 1 so that it can be easily seen from the horizontal direction. A road sign pillar provided with is disclosed. In the road sign pillar described in Patent Document 2, it is necessary to supply electricity to two types of light sources, that is, a light source that irradiates the pole portion from inside the hollow portion and a light source that irradiates in the external horizontal direction. A large storage battery is used. For this reason, the electricity storage member cannot be accommodated in the base portion, and an anchor portion capable of accommodating the electricity storage member is formed below the base portion.
[0005]
[Patent Document 1]
JP-A-8-239812 [Patent Document 2]
JP-A-11-36240 [Problems to be Solved by the Invention]
In the above known road sign pillars, the pole portion is made of a hollow rubber-like elastic body in order to recover the deformation caused by the stepping on the traveling vehicle so that the shape can be self-recovered and at the same time to prevent damage due to the collision. The base portion is formed of solid rubber or resin.
[0006]
However, the road sign pillar described in Patent Document 1 is composed of two members, a pedestal and a holding ring, and the manufacturing process is complicated and requires man-hours. However, the strength when driving on this is not enough. In addition, the storage member of the solar cell disclosed in Patent Document 1 is a storage battery, and its life is about 5 years, which is shorter than 6 to 8 years, which is the life in the normal use state of the road sign post, and is replaced. Is necessary, and there is a problem that it is necessary to remove and replace the sign pillars installed on the road one by one.
[0007]
Since the road sign column described in Patent Document 2 is provided with a storage battery housing part below the road surface installation surface of the base part, a large hole having a diameter of about 100 mm is provided on the road surface during installation, and a large road anchor It was necessary to prepare and embed the member, which was not preferable and an improvement was demanded.
[0008]
When the light source described in Patent Document 1 is changed to an LED and the storage member of the solar cell is changed to a capacitor, the storage member has a size that can be accommodated by forming a recess in the base portion, and the road described in Patent Document 2 The problem with signposts is solved. Such road sign pillars can be installed simply by embedding a small anchor member having a diameter of 38 mm in the road surface with a hole having a diameter of 60 mm according to the same specifications as the installation of other general road sign pillars. Therefore, the installation specifications are unified and simplified.
[0009]
However, a road sign pillar that contains an electrical member such as an optical sensor, a condenser, and a circuit board for controlling these in a recess formed in the base is experimentally manufactured, installed, and set as a standard for installation. When a passenger car was tested to confirm that it had sufficient durability, it was actually installed and used on the road surface. In addition, when the cooling / heating cycle test was performed, there was a problem in that the lighting could not be turned on.
[0010]
The object of the present invention is that the pole part is easy to visually recognize by internal lighting, which has a lifespan without replacing the power storage member when installed on the road surface, and the problem that the lighting does not turn on is greatly suppressed than before. It is to provide a road sign pillar and a manufacturing method thereof.
[0011]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present inventors diligently studied the prevention of the trouble that the lighting does not turn on when installed on the road surface. As a result, the optical sensor, the condenser, and these are controlled in the recess formed in the base part. The present invention finds that the occurrence of such a problem can be significantly suppressed by accommodating an electric member such as a circuit board for wiring and arranging and wiring and sealing with a reactive curable resin for sealing. It came to complete.
[0012]
That is, the present invention is a road sign post comprising a hollow pole portion made of a thermoplastic elastomer and a base portion made of a reactive curable resin, which is fixed to a lower end portion of the pole portion, and made of a reactive curable resin for standing the pole portion. And
A plurality of LEDs are formed on the base portion facing the hollow portion of the pole portion, and a solar cell is disposed on the upper surface outside the pole portion of the base portion, and is formed on the lower surface side of the base portion. The concave portion contains a storage capacitor and a circuit board, and is filled and sealed with a reactive curable resin for sealing.
[0013]
By storing the capacitor for storage and the circuit board in the recess formed on the lower surface side of the base portion (the ground surface side = the side surface opposite to the pole portion standing position), and then filling and sealing with a reactive curable resin for sealing The reason why it is possible to prevent the occurrence of a problem that the lighting is not turned on when the road sign pillar is installed on the road surface is not clear, but is presumed to be due to the following action.
[0014]
(1) Preventing the deformation of the base portion When the concave portion is formed in the base portion, the state in which the road sign pillar is installed on the road surface is a so-called bowl-like shape in which the concave portion is opened downward. Since the base part is made of resin, the flexural elasticity is small compared to metal, so when the vehicle passes over this, it receives the shocking load, the opening of the recess expands, and the bowl is pushed As a result, the electric member housed inside is damaged, or the wiring is cut and the light source does not turn on. Since the test before installation is performed on a passenger car, the load is light and no such trouble can be found, but in fact, a large truck with a total weight of 20 tons or more also runs, and when such a heavy vehicle passes, The deformation of the recess is large, and the internal member is destroyed. By filling and sealing the recess containing the electrical member with a reactive curable resin for sealing, even when a heavy vehicle passes, the deformation of the recess is prevented and at the same time the load and pressure applied to the electrical member are dispersed. The damage is prevented.
[0015]
(2) Anti-condensation action 80 ° C, 2 hours ·· 20 ° C, 0.5 hours ··· -30 ° C, 2 hours ··· 20 ° C, 0.5 hours as one cycle However, with conventional road sign pillars that do not seal with resin, there is a problem that lighting does not light for the reason that it is estimated to be dew condensation in the lighting test. Does not occur. When sealing with resin is performed, even when the road is flooded due to rain or the like, it is possible to prevent the occurrence of problems due to water intrusion.
[0016]
In the above road sign pillar, the thermoplastic elastomer that is the pole portion constituent material is a thermoplastic polyurethane elastomer, and the reaction curable resin that is the base portion constituent material is a cast type polyurethane resin, and the sealing It is preferable that the reactive curable resin is a cast type polyurethane resin or epoxy resin.
[0017]
Thermoplastic polyurethane elastomer is an elastic body that has high flexibility, is strong, and has excellent bending resistance. It is easily deformed even when a traveling vehicle collides, and does not damage the vehicle. Even if it is deformed by collision or trampling, it has a high function of restoring to its original shape, and the pole part is not easily damaged.
[0018]
Casting type polyurethane resin or epoxy resin has high strength of cured resin and does not break due to the load caused by stepping on the traveling vehicle, and maintains durability as a road sign pillar and at the same time breaks the electrical member housed in the recess It has a protective effect. In addition, because it has excellent adhesion to the thermoplastic elastomer that constitutes the pole part, especially thermoplastic polyurethane elastomer, the pole part will cause adhesion peeling and end deformation even if stress that strongly deforms the pole part acts It will not fall out due to.
[0019]
In said road sign pillar, it is preferable that the said reaction curable resin for sealing is an epoxy resin containing an inorganic filler.
[0020]
With such a configuration, an epoxy resin having excellent adhesive strength with the base part and the electric member and having a high compression elastic modulus is obtained, and a curable resin composition for sealing having a high function of protecting the electric member is obtained.
[0021]
It is preferable that the road sign pillar of the present invention further includes at least one strip-like retroreflective sheet attached to the outer surface of the pole portion.
[0022]
With such a configuration, a road sign pillar with better nighttime visibility is obtained. Although one retroreflective sheet may be sufficient, you may provide about 2-5.
[0023]
Another aspect of the present invention is a method for manufacturing a road sign pillar in which a hollow pole portion made of a thermoplastic elastomer and a base portion made of a reaction curable resin are fixed,
Pole part molding step for molding the pole part, and after setting the lower end part of the pole part in the base part mold, the curable composition of the reactive curable resin is injected into the base part mold and cured. Forming the base part, forming a plurality of LEDs at positions facing the hollow part of the pole part of the base part, forming a solar cell on the upper surface of the base part on the outer side of the pole part, and on the grounding surface side of the base part An electric member disposing step of disposing the power storage member and the circuit board in the recessed portion, and a curability of the reactive curable resin for sealing in the concave portion of the base portion in which the power storage member and the circuit substrate are disposed and accommodated. It has the sealing process which fills and hardens a composition, It is characterized by the above-mentioned.
[0024]
With the manufacturing method having such a configuration, it is possible to manufacture an internal lighting type road sign post in which the occurrence of a problem that the lighting does not turn on when installed on the road surface is prevented.
[0025]
In the manufacturing method having the above configuration, for the reasons described above, the thermoplastic elastomer that is the constituent material of the pole portion is a thermoplastic polyurethane elastomer, and the reaction curable resin that is the constituent material of the base portion is a cast type polyurethane resin. It is preferable that the sealing reaction curable resin is a cast type polyurethane resin or epoxy resin.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, a known thermoplastic elastomer can be used without limitation as the thermoplastic elastomer which is a material constituting the pole portion. Specific examples include thermoplastic elastomers such as polyurethane, polyester, polyamide, polyvinyl chloride, and polyolefin.
[0027]
Among these, the use of a polyurethane-based thermoplastic elastomer is particularly preferable because the pole portion has a high function of recovering its shape even when it is repeatedly stepped on the traveling vehicle and greatly deforms, and is tough and less likely to break. As thermoplastic polyurethane elastomers, polyether polyurethane elastomers using polyoxypropylene polyols or polyoxytetramethylene polyols as constituent polyol components, polycaprolactone polyols or low capacities such as ethylene glycol and 1,6-hexanediol as constituent polyol components are used. Examples thereof include polyester-based polyurethane elastomers using a polyester-based polyol such as a condensate polyol of a dicarboxylic acid such as a molecular weight glycol and adipic acid or dimer acid, and polycarbonate-based polyurethane elastomers using a polycarbonate-based polyol as the polyol component.
[0028]
The thermoplastic elastomer is a white or slightly brown translucent material, and if the pole part is molded to a thickness of 2 to 10 mm, preferably 3 to 8 mm, the necessary coloring pigment may be added and colored. It is light transmissive and can be brightened at night by illumination with an internal light source to provide sufficient visibility.
[0029]
The curable composition that forms the reaction curable resin that is the base portion constituent material uses a resin material that has a high strength after curing and that is not damaged by a load caused by stepping on the traveling vehicle. In particular, although the bottom surface of the base portion is formed as a flat surface, the road surface is not necessarily flat, and the base portion may be subjected to bending deformation when the vehicle is stepped on. Even in such a case, the base part constituent material is required to have a certain degree of flexibility so as not to be damaged. Such reactive curable resin materials include radical polymerization initiators, unsaturated polyester resins and acrylic resins that are cured by a curing reaction by irradiation with energy rays such as ultraviolet rays and electron beams, isocyanate groups and hydroxyl groups, and primary or secondary. Examples thereof include a cast type polyurethane resin that is cured by a curing reaction with a primary amino group, an epoxy resin that is cured by a curing reaction with an amino group, a carboxyl group, and an acid anhydride group of an epoxy group. Among these reaction curable resins, when the pole portion is composed of a thermoplastic polyurethane elastomer, it is particularly preferable to use a cast type polyurethane resin.
[0030]
The hardness of the reactive curable resin that is the base portion constituent material is preferably Shore A hardness 80 or more and Shore D hardness 70 or less, and Shore A hardness 85 or more and Shore D hardness 65 or less. More preferred.
[0031]
As the reactive curable resin for sealing, a resin that has fluidity in the sealing step and is cured after completion of filling in the recesses is used. Specifically, it can be used by appropriately selecting from the reaction curable resins exemplified as the base portion constituting material. The sealing reaction curable resin needs to have a function of protecting the electrical member housed in the recess from being damaged, and preferably has a compression modulus of 0.5 GPa to 5 GPa. .
[0032]
The hardness of the reactive curable resin for sealing is also preferably a Shore A hardness of 80 or more and a Shore D hardness of 70 or less, more preferably a Shore A hardness of 85 or more and a Shore D hardness of 65 or less.
[0033]
The cast type polyurethane resin suitable as a reaction curable resin which is a base part constituting material and a reaction curable resin for sealing is an isocyanate prepolymer and a chain extender and an NCO / OH ratio of 0.9 to 1.4, preferably Is formed by curing a curable composition obtained by mixing so as to be 0.95 to 1.2. Such a curable composition has fluidity that can be filled in a mold at room temperature to 100 ° C. The viscosity of the curable composition is preferably 400 mPa · s (20 ° C.) to 20000 mPa · s (100 ° C.) as the viscosity when being injected into the mold or the recess in the molding step or the sealing step. More preferably, it is ˜7000 mPa · s.
[0034]
In the isocyanate prepolymer, an equivalent ratio (NCO / OH) of an isocyanate group (NCO) and a hydroxyl group (OH) of a polyol compound and a diisocyanate compound having an average molecular weight of 500 to 3000 is 1.6 to 2.5, preferably 1. Obtained by reacting in the range of 8-2.2. As the chain extender, a compound known as a chain extender in the technical field of polyurethane can be used without limitation. Specifically, there are many chain extenders such as ethylene glycol, 1,4-butanediol, and bis (2-hydroxyethoxy) benzene. Examples include functional alcohols, diamines such as methylene (bis-o-chloroaniline) (MOCA), dimethyltoluenediamine, and the like.
[0035]
As the epoxy resin suitable as the reaction curable resin which is the base portion constituting material and the reaction curable resin for sealing, a known so-called elastic epoxy resin can be used. For example, 4,4′-isopropylidenediphenol and Examples of the two-component type epoxy resin include a 1-chloro-2,3-epoxypropane polymer as an epoxy compound component and a modified aliphatic polyamine as a curing agent. Commercially available products are also suitable, and examples include Soflan Bond PM9004N.
[0036]
Addition of a colorant, a filler, and the like to the reaction curable resin as necessary is a preferable embodiment from the viewpoint of improving the commercial value of the appearance and improving mechanical properties such as strength and compression modulus. is there.
[0037]
In particular, it is preferable to add an inorganic filler to the above epoxy resin, especially an epoxy resin used as a curable resin for sealing, and the above range while maintaining the necessary flexibility by adding the inorganic filler. It is possible to form a curable resin for sealing having a compression elastic modulus of 5%. As the inorganic filler, it is preferable to use a material having a reinforcing property without impairing the fluidity of the curable composition, and specific examples thereof include silica and silica sand.
[0038]
Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a partial cross-sectional view showing a preferred embodiment of the road sign pillar of the present invention. The road sign pillar 10 is composed of a pole portion 12 and a base portion 14 which are hollow and closed at the head, and the lower end portion of the pole portion 12 is fixed by being embedded in the base portion 14. In order to prevent the pole portion from falling off, the lower end portion of the pole portion is formed in a hook shape that is bent outward in a sectional view and the tip portion is inverted. On the outer surface of the pole part, two retroreflective sheets 11 are wound in a belt shape to improve visibility at night.
[0039]
A plurality of LEDs (light emitting diodes) 15 are provided in a portion of the base portion facing the hollow portion of the pole portion, and the pole portion is irradiated from the inner surface to improve the visibility of the road sign pillar at night. Yes. In the base portion, the solar cell 26 is disposed on the upper surface outside the pole portion. A concave portion 21 is formed on the grounding surface side of the base portion 14, and the concave portion 21 accommodates electrical members such as a capacitor 18 for storing electricity obtained from the solar cell and a circuit board 16 for control. After performing the predetermined connection, the resin is filled and sealed with the reactive curable resin 20 for sealing. In addition to these, a light sensor (not shown) that detects lighting at night is also installed in the base unit 14. The optical sensor needs to be aware of external light, and is preferably installed on the upper surface of the base portion 14 outside the pole portion 12, but in another recess provided at the lower portion (grounding surface side) of the base portion 14. In the case of disposing in, the recess is preferably filled and sealed with a reactive curable resin for sealing.
[0040]
FIG. 2 is a cross-sectional view showing the XX cross section of FIG. An example is shown in which six LEDs are disposed in the hollow portion of the pole portion 12 of the base portion 14 and two solar cells are disposed on the outer upper surface of the pole portion 12 of the base portion 14. It is preferable that the LED 15 as the light source is disposed at different angles so that the pole portion 12 can be illuminated uniformly from above to below. Moreover, it is preferable that the solar cell 26 is concentrated on a part of the base portion 14 as illustrated. By installing the road sign pillar so that the portion where the solar cells 26 are concentrated on the base portion 14 is in the south direction, the most efficient storage can be achieved.
[0041]
FIG. 3 is a cross-sectional view illustrating a state in which the road sign pillar 10 illustrated in FIG. 1 is installed on the road. A fixing bracket 50 having a fixing bolt 54 is attached and fixed to the grounding surface (lower surface) of the base portion 14 of the road sign post 10 with a screw 46. The road sign pillar 10 to which the fixing bracket 50 is mounted and fixed is fixed by screwing the fixing bolt 54 of the fixing bracket 50 to the anchor 52 installed on the road surface. The anchor used in FIG. 3 can be the same as another type of anchor for fixing a road sign pillar (current standard has an outer diameter of 38 mm), and the road sign pillar provided with the internal illumination device described in Patent Document 2 As described above, it is not necessary to provide a large anchor for another standard on the road, and the installation work is unified and simplified.
[0042]
FIG. 4 shows the base part forming step. The pole portion is formed by a known method. In particular, it is preferable to mold by an injection molding method. The base part is molded by injecting a curable composition for forming a reaction curable resin into a mold and reaction curing. In the example shown in FIG. 4, the mold is composed of an upper mold 31 and a lower mold 33, and the pole portion 12 is supported at a predetermined position by a support base 35. The support base 35 may be used as a part of the molding die to form a gap after demolding, or may be integrated with the base portion 14 without using a resin similar to that of the base portion. In the molds 31 and 33, a screw hole forming member 41, a recess forming member 37, a wiring groove forming member 38, a solar cell panel disposing portion forming member 31, an optical sensor disposing portion forming member (not shown) and the like are disposed. Is done. The upper mold 31 is formed with an injection port 42, and a curable composition C for forming a reactive curable resin, which is a base portion constituting material, is injected into the mold from the injection port. FIG. 4 shows an example in which the concave portion for accommodating the capacitor and the circuit board is preferably formed by disposing a member in a predetermined shape on the molding die. However, a cutting machine is used after the base portion is molded. It may be formed by cutting.
[0043]
FIG. 5 illustrates the sealing process in a cross-sectional view. In the concave portion 21 formed on the bottom surface of the base portion 10 of the road sign post 10 after the base portion 14 is formed in the base portion forming step illustrated in FIG. 4, the LED 15 that is a light source, the solar cell 26, the circuit board 16, and the capacitor 18 is arranged and necessary connections are made. Next, the curable composition is injected into the recess 21 and reacted and cured to form the curable resin composition 20 for sealing.
[0044]
【Example】
(Examples 1 and 2)
In the road sign pillar shown in FIG. 1, a recess having a depth of 35 mm and a diameter of 90 mm is formed on the bottom surface of the base portion, and six LEDs are formed in the bottom portion of the recess so as to communicate with the hollow portion of the pole portion. Next, the circuit board and the capacitor 18 are arranged and fixed, and after making the necessary connections, epoxy resin (Sophane Bond PM9004N, Toyo Tire & Rubber Co., Ltd.) is used as a raw material for sealing reaction curable resin, and silica sand is added as a filler. Then, sealing was carried out using the composition whose compression elastic modulus was adjusted.
The amount of silica sand added to the epoxy resin was epoxy resin / silica sand = 1/2 (weight ratio). The used silica sand is silica sand No. 6 (manufactured by Yamamori Civil Engineering Co., Ltd.).
Example 1: Compression elastic modulus of sealing curable resin = 2.6 GPa
Example 2: Compression modulus of sealing curable resin = 1.1 GPa
The compression modulus was measured according to JIS K 7208.
[0045]
The evaluation is 10 steps of continuous tread test using a 20-ton truck (vehicle weight 10 tons, cargo load 10 tons), 80 ° C, 2 hours, 20 ° C, 0.5 hours, -30 ° C, 2 hours, -Five cycles of the thermal cycle test were conducted with 20 hours at 0.5C as one cycle. As a result, none of the road sign pillars had any problems.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view showing a preferred embodiment of a road sign post according to the present invention. FIG. 2 is a cross-sectional view showing an XX cross section of FIG. FIG. 4 is a cross-sectional view illustrating a base portion molding process. FIG. 5 is a cross-sectional view illustrating a sealing process.
10 Road sign pillar 12 Pole part 14 Base part 15 LED
16 Circuit board 18 Capacitor 21 Recess 26 Solar cell

Claims (5)

A road sign pillar comprising a hollow pole portion made of a thermoplastic elastomer and a base portion made of a reaction curable resin for fixing the pole portion, which is fixed to a lower end portion of the pole portion,
A plurality of LEDs are arranged on the base part facing the hollow part of the pole part, and a solar cell is disposed on the upper surface of the base part on the outer side of the pole part, and an opening is formed on the lower surface side of the base part. A road sign post characterized in that a storage capacitor and a circuit board are accommodated in the recessed portion and filled and sealed with a reactive curable resin for sealing. The thermoplastic elastomer as the pole part constituent material is a thermoplastic polyurethane elastomer, the reactive curable resin as the base part constituent material is a cast type polyurethane resin, and the reactive curable resin for sealing is poured. The road sign pillar according to claim 1, wherein the road sign pillar is a type-type polyurethane resin or epoxy resin. The road sign pillar according to claim 1 or 2, wherein the sealing reaction curable resin is an epoxy resin containing an inorganic filler. A method for producing a road sign pillar comprising a hollow pole portion made of a thermoplastic elastomer and a base portion made of a reactive curable resin for fixing the pole portion, which is fixed to a lower end portion of the pole portion,
Pole part molding step for molding the pole part, and after setting the lower end part of the pole part in the base part mold, the curable composition of the reactive curable resin is injected into the base part mold and cured. Forming a base part, a plurality of LEDs at positions facing the hollow part of the pole part of the base part, a solar cell on the upper surface outside the pole part of the base part, and a lower surface side of the base part. An electric member disposing step of disposing the power storage member and the circuit board in the recessed portion, and a curable composition of the reactive curable resin for sealing in the concave portion of the base portion in which the power storage member and the circuit substrate are disposed and accommodated. A method for producing a road sign pillar, comprising a sealing step of filling and curing an object. The thermoplastic elastomer as the pole part constituent material is a thermoplastic polyurethane elastomer, the reactive curable resin as the base part constituent material is a cast type polyurethane resin, and the reactive curable resin for sealing is poured. 5. The method for producing a road sign pillar according to claim 4, wherein the road sign pillar is a type-type polyurethane resin or epoxy resin.

Images