Asphalt temperature display device

Abstract

To provide an asphalt temperature display device that has a simple configuration and high visibility, and can notify workers that temperature of an asphalt pavement surface has reached suitable temperature for opening traffic.SOLUTION: An asphalt temperature display device (10) has a placement part (11) that is placed on an asphalt pavement surface, and a temperature display part (13) that is provided on the placement part (11) and displays the temperature of the asphalt pavement surface. The temperature display part (13) is made of a material whose color or light transmittance changes at a predetermined temperature.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an asphalt temperature indicator, and more particularly to an asphalt temperature indicator that indicates when a paved asphalt surface has reached a temperature at which it can be opened for traffic. [Background technology]

[0002] When paving asphalt pavement on roads, etc., a heated asphalt mixture is spread evenly over the road surface and compacted by rolling to form the surface layer. However, asphalt pavement is prone to deformation immediately after paving, as its temperature has not yet dropped sufficiently, and the road cannot be immediately opened to traffic for vehicles to run on. Therefore, the surface temperature of the asphalt pavement is measured using a contact or non-contact thermometer, and the road is opened to traffic once the surface temperature has dropped to a temperature suitable for opening to traffic (for example, about 50°C) (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-273322 Summary of the Invention [Problem to be solved by the invention]

[0004] However, because the time it takes for the surface temperature of asphalt pavement to drop to a temperature suitable for reopening to traffic varies depending on the season and weather conditions, it is difficult to predict the time from compaction to reopening to traffic. Therefore, it is necessary to measure the surface temperature multiple times at specified intervals, which makes the work complicated and tends to lengthen the time until the road is reopened to traffic.

[0005] To solve this problem, one possible solution is to use a device that continuously measures the surface temperature of the asphalt pavement with a thermometer and notifies workers of the measurement results using sound, light, or a screen display when the temperature reaches a level suitable for opening the road to traffic. However, in order to notify workers working more than several meters away of the measurement results, the volume and light intensity must be increased, which is undesirable from the standpoints of noise, light pollution, and dazzling to passing vehicles.

[0006] Therefore, the present invention has been developed in consideration of the above-mentioned conventional problems, and aims to provide an asphalt temperature display device that has a simple configuration, is highly visible, and can notify workers when the asphalt pavement surface has reached a temperature suitable for opening to traffic. [Means for solving the problem]

[0007] In order to solve the above problems, the asphalt temperature display device of the present invention has a mounting section that is placed on the surface of the asphalt pavement, and a temperature display section that is provided on the mounting section and displays the temperature of the asphalt pavement surface, and is characterized in that the temperature display section is made of a material that changes color or light transmittance at a predetermined temperature.

[0008] In the asphalt temperature display device of the present invention, the temperature display unit is made of a material whose color or light transmittance changes at a predetermined temperature, and the temperature display unit is provided on a mounting unit that is placed on the asphalt pavement surface.This means that the device has a simple configuration, is highly visible, and can notify workers that the asphalt pavement surface has reached a temperature suitable for opening to traffic.

[0009] In one aspect of the present invention, the placement portion has heat resistance of 70° C. or higher.

[0010] In one aspect of the present invention, the device has a separation prevention section that prevents the placement section from separating from the asphalt pavement surface.

[0011] In one aspect of the present invention, the mounting portion is provided with a plurality of through holes.

[0012] In one aspect of the present invention, the surface of the placing portion that comes into contact with the asphalt pavement surface is oil-repellent.

[0013] In one aspect of the present invention, the predetermined temperature is 50°C. [Effects of the Invention]

[0014] The present invention can provide an asphalt temperature display device that has a simple configuration, is highly visible, and can notify workers that the asphalt pavement surface has reached a temperature suitable for opening to traffic. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a schematic perspective view showing an example of the configuration of an asphalt temperature display device 10 according to a first embodiment. [Figure 2] 1 is a schematic cross-sectional view showing an example of the configuration of an asphalt temperature display device 10 according to a first embodiment. [Figure 3] 3A and 3B are schematic plan views showing examples of changes in the temperature display section 13 of the asphalt temperature display device 10, where FIG. 3A shows a case where the temperature is higher than the temperature suitable for opening to traffic, and FIG. 3B shows a case where the temperature is lower than the temperature suitable for opening to traffic. [Figure 4] FIG. 10 is a schematic perspective view showing an example of the configuration of an asphalt temperature display device 10 according to a second embodiment. [Figure 5] FIG. 10 is a schematic cross-sectional view showing an example of the configuration of an asphalt temperature display device 10 according to a second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0016] (First embodiment) Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. The same or equivalent components, members, and processes shown in each drawing will be given the same reference numerals, and duplicate explanations will be omitted where appropriate. FIG. 1 is a schematic perspective view showing an example of the configuration of an asphalt temperature display device 10 according to this embodiment. FIG. 2 is a schematic cross-sectional view showing an example of the configuration of an asphalt temperature display device 10 according to this embodiment. As shown in FIGS. 1 and 2, the asphalt temperature display device 10 comprises a mounting portion 11, a weight 12, a temperature display portion 13, and a through-hole 14.

[0017] The mounting portion 11 is placed with its back surface in contact with the asphalt pavement surface 20, and is the portion through which the temperature of the asphalt pavement surface 20 is transmitted. In the example shown in Figures 1 and 2, a weight 12 and a temperature display unit 13 are provided on the front side of the mounting portion 11, and the mounting portion 11 has a plurality of through holes 14.

[0018] The shape and structure of the mounting portion 11 are not limited, but it is preferably in the form of a flat plate or sheet in order to transmit the temperature of the asphalt pavement surface 20 to the temperature display unit 13. The mounting portion 11 may also be made of a flexible material so that when placed on the asphalt pavement surface 20, it can conform to the unevenness and curves of the asphalt pavement surface 20. The mounting portion 11 may also have a multi-layer structure or a structure such as woven fabric, knitted fabric, or nonwoven fabric.

[0019] The material constituting the mounting portion 11 is not limited, but preferably has heat resistance of 70°C or higher, and more preferably 90°C or higher, so as to withstand the temperature of the asphalt pavement surface 20 immediately after paving. Furthermore, in order to efficiently transmit the temperature of the asphalt pavement surface 20 to the temperature display unit 13, it is preferable to form the mounting portion 11 from a material with high thermal conductivity. Examples of materials that can be used to form the mounting portion 11 include metal materials, paper, cloth, and resin materials. Metal materials include iron, copper, and stainless steel, while resin materials include high-density polyethylene, polypropylene, polyacetal, polycarbonate, polysulfone, and polyphenylene sulfide.

[0020] The weight 12 is a member that uses its weight to press the mounting portion 11 against the asphalt pavement surface 20. The weight 12 in this embodiment functions to prevent the mounting portion 11 from peeling off from the asphalt pavement surface 20, and therefore corresponds to the peeling prevention portion in the present invention. Although Figures 1 and 2 show the weight 12 as a frame that follows the outer periphery of the mounting portion 11, the structure is not limited as long as it can prevent the mounting portion 11 from peeling off from the asphalt pavement surface 20. The position where the weight 12 is provided on the mounting portion 11 is not limited, but it is preferable to provide the weight 12 on the front side of the mounting portion 11 in order to ensure good contact between the back side of the mounting portion 11 and the asphalt pavement surface 20.

[0021] The weight 12 may be attached to the mounting portion 11 using an adhesive or the like, or may be separated as a separate member and then combined. Furthermore, the weight 12 may be integrally formed as part of the mounting portion 11 by increasing the thickness of a portion of the mounting portion 11. Furthermore, the weight 12 may be divided into multiple parts and distributed within the surface of the mounting portion 11.

[0022] The temperature display unit 13 is made of a material whose color or light transmittance changes at a predetermined temperature, and is a part that visually displays the temperature of the asphalt pavement surface 20. The material that makes up the temperature display unit 13 is not limited, and conventionally known thermochromic materials whose color or light transmittance changes reversibly with temperature can be used. The method for forming the temperature display unit 13 on the surface of the mounting unit 11 is not limited, and examples include methods in which a thermochromic material is dissolved in a solvent and printed or applied to the surface of the mounting unit 11. The predetermined temperature at which the color or light transmittance of the temperature display unit 13 changes is not limited, but is preferably a temperature of the asphalt pavement surface 20 that is suitable for opening the road; one example of the predetermined temperature is 50°C.

[0023] The through holes 14 are holes that penetrate from the front surface side to the back surface side of the mounting portion 11. While Fig. 1 shows an example in which the through holes 14, which are circular in top view, are arranged in 3 rows and 3 columns, the shape, size, number, and arrangement of the through holes are not limited. Furthermore, the through holes 14 may be formed by processing holes in the mounting portion 11, or the mounting portion 11 may be configured with a mesh structure and the mesh portions may be used as the through holes 14.

[0024] FIG. 3 is a schematic plan view showing an example of the change in the temperature display unit 13 of the asphalt temperature display device 10. FIG. 3(a) shows a case where the temperature is higher than the temperature suitable for traffic opening, and FIG. 3(b) shows a case where the temperature is below the temperature suitable for traffic opening. As shown in FIG. 3(a), when the temperature of the asphalt pavement surface 20 has not yet dropped to the predetermined temperature suitable for traffic opening, the temperature display unit 13, shown by the dashed line, blends in with the mounting portion 11, making the temperature display unit 13 less visible. In contrast, as shown in FIG. 3(b), when the temperature of the asphalt pavement surface 20 has dropped to the predetermined temperature suitable for traffic opening, the color or light transmittance of the temperature display unit 13 changes, making the design of the temperature display unit 13 easily visible. This allows workers to easily recognize that the asphalt pavement surface 20 has reached a temperature suitable for traffic opening simply by placing the asphalt temperature display device 10 on the asphalt pavement surface 20 after paving the asphalt pavement.

[0025] The shape of the temperature display unit 13 is not limited, but it is preferable to use a simple design with little information so that workers can easily recognize that the asphalt pavement surface 20 has reached the predetermined temperature. In the example shown in Figure 1, the design displays the number 50 so that the predetermined temperature (50°C) suitable for opening to traffic can be intuitively understood. Other shapes for the temperature display unit 13 include the text "Open to traffic," a circle or other symbol indicating that traffic is open, and a graphic icon indicating vehicle passage.

[0026] 3(a) and 3(b) show an example in which the visibility of the temperature display unit 13 increases when the asphalt pavement surface 20 drops to a predetermined temperature, but the form is not limited as long as the visibility of the temperature display unit 13 changes when the predetermined temperature is reached. In another form, the visibility of the design of the temperature display unit 13 may be high when the asphalt pavement surface 20 is at or above a predetermined temperature, and the colors of the temperature display unit 13 and the placing unit 11 may merge when the temperature drops to the predetermined temperature, reducing the visibility of the design of the temperature display unit 13.

[0027] The color assimilation of the mounting portion 11 and the temperature display portion 13 does not only mean that the colors of the two are completely the same, but also means that the colors are similar and the contrast is reduced. It also means that the temperature display portion 13 has high light transmittance, so that the color of the surface of the mounting portion 11 is visible through the temperature display portion 13 and the contrast is reduced. The high visibility of the temperature display portion 13 means that the mounting portion 11 and the temperature display portion 13 can be clearly distinguished from each other, and includes, for example, cases where the colors of the temperature display portion 13 and the mounting portion 11 are opposite colors or have significantly different brightness levels. It also includes cases where the area of the mounting portion 11 where the temperature display portion 13 is formed has a different color or brightness level from the other areas, and the high light transmittance of the temperature display portion 13 makes the design of the temperature display portion 13 easier to see.

[0028] In this embodiment, the weight 12 is used as the peeling prevention unit, which allows the mounting unit 11 to be in good contact with the asphalt pavement surface 20, transmitting the temperature of the asphalt pavement surface 20 and reducing the temperature difference between the temperature display unit 13 and the asphalt pavement surface 20. Furthermore, if the mounting unit 11 is attached to the asphalt pavement surface 20 using an adhesive layer or the like, the mounting unit 11 is likely to peel off due to the oil content of the surface of the asphalt pavement 20. However, by using the weight 12 as the peeling prevention unit, the weight of the weight 12 can press the mounting unit 11 against the asphalt pavement surface 20, preventing the mounting unit 11 from peeling off from the asphalt pavement surface 20 and allowing temperature measurement to continue.

[0029] Furthermore, the provision of through holes 14 in the mounting portion 11 ensures air permeability and water permeability between the back side and front side of the mounting portion 11. As a result, when spraying cooling water onto the asphalt pavement surface 20, water can be efficiently supplied to the area where the asphalt temperature display device 10 is placed, thereby cooling the area. Furthermore, because air passes from the back side to the front side of the mounting portion 11 via the through holes 14, heat dissipation is ensured, and the cooling time of the asphalt pavement surface 20 can be shortened.

[0030] As described above, in the asphalt temperature display device 10 of this embodiment, the temperature display unit 13 is made of a material whose color or light transmittance changes at a predetermined temperature, and the temperature display unit 13 is provided on the mounting unit 11 that is placed on the asphalt pavement surface 20.This means that the configuration is simple, has high visibility, and can notify workers that the asphalt pavement surface 20 has reached a temperature suitable for opening to traffic. (Second embodiment)

[0031] Next, a second embodiment of the present invention will be described with reference to Figs. 4 and 5. Description of content that overlaps with the first embodiment will be omitted. Fig. 4 is a schematic perspective view showing an example of the configuration of an asphalt temperature display device 10 according to this embodiment. Fig. 5 is a schematic cross-sectional view showing an example of the configuration of an asphalt temperature display device 10 according to this embodiment. As shown in Figs. 4 and 5, the asphalt temperature display device 10 comprises a mounting portion 11, a temperature display portion 13, a through hole 14, a pin 15, and an antifouling layer 16.

[0032] As shown in Figures 4 and 5, in this embodiment, the temperature display unit 13 is embedded in the mounting portion 11. As one example, the mounting portion 11 and the temperature display unit 13 may both be made of resin, and may be integrally molded using two-color molding technology. As another example, the mounting portion 11 may be formed in a mesh or woven fabric shape, and the resin that forms the temperature display unit 13 may be allowed to permeate the mounting portion 11. When the temperature display unit 13 is made of resin, a thermochromic material may be dispersed in the resin.

[0033] The through-holes 14 are provided so as to penetrate from the front surface of the mounting portion 11 to the rear surface of the antifouling layer 16. In the examples shown in Figures 4 and 5, the through-holes 14 are formed at positions that avoid the temperature display portion 13, but the through-holes 14 may also be formed within the area of the temperature display portion 13.

[0034] The pin 15 is a member that is inserted from the front side to the back side of the mounting portion 11 and the anti-fouling layer 16 to secure the asphalt temperature display device 10 to the asphalt pavement surface 20. In the example shown in Figures 4 and 5, the pin 15 has a pointed tip and a head at its rear end. By inserting the tip of the pin 15 through the mounting portion 11 and the anti-fouling layer 16 and piercing the asphalt pavement surface 20, the asphalt temperature display device 10 is secured to the asphalt pavement surface 20 and prevented from peeling off. Therefore, the pin 15 corresponds to the peeling prevention portion in this invention.

[0035] The antifouling layer 16 is formed on the back side of the support portion 11 and is a layer that prevents dirt from adhering to the support portion 11. There are no limitations on the material that can be used to form the antifouling layer 16, but an oil-repellent material can be used to prevent the adhesion of oil present on the asphalt pavement surface 20. One example of a material that can form the antifouling layer 16 is a fluorine-based resin such as polytetrafluoroethylene. Although FIGS. 4 and 5 show an example in which the antifouling layer 16 is formed as a layer separate from the support portion 11, if the support portion 11 is made of an oil-repellent material, the antifouling layer 16 can be omitted.

[0036] When the asphalt temperature display device 10 is used repeatedly, if the back side of the mounting portion 11 becomes dirty with oil or asphalt mixture, this may result in a decrease in adhesion between the mounting portion 11 and the asphalt pavement surface 20, and a decrease in thermal conductivity due to the dirt. In this embodiment, an anti-fouling layer 16 is formed on the back side of the mounting portion 11, making the contact surface oil-repellent. This prevents a decrease in adhesion and a decrease in thermal conductivity due to the adhesion of oil or asphalt mixture, and reduces the temperature difference between the temperature display unit 13 and the asphalt pavement surface 20.

[0037] In the asphalt temperature display device 10 of this embodiment, the temperature display unit 13 is also made of a material whose color or light transmittance changes at a predetermined temperature, and the temperature display unit 13 is provided on the mounting unit 11 that is placed on the asphalt pavement surface 20.This means that the configuration is simple, has high visibility, and can notify workers that the asphalt pavement surface 20 has reached a temperature suitable for opening to traffic.

[0038] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. [Explanation of symbols]

[0039] 10...Asphalt temperature display device 11...Placement section 12...Weight 13…Temperature display section 14...Through hole 15...pin 16...Anti-fouling layer 20...Asphalt pavement surface

Claims

1. a placing portion to be placed on the asphalt pavement surface; A temperature display unit is provided on the mounting unit to display the temperature of the asphalt pavement surface, An asphalt temperature display device characterized in that the temperature display unit is made of a material whose color or light transmittance changes at a predetermined temperature.

2. The asphalt temperature display device according to claim 1, The asphalt temperature display device is characterized in that the mounting portion has a heat resistance of 70°C or more.

3. The asphalt temperature display device according to claim 1, An asphalt temperature display device characterized by having a separation prevention part that prevents the placement part from separating from the asphalt pavement surface.

4. The asphalt temperature display device according to claim 1, An asphalt temperature display device characterized in that the mounting portion is provided with a plurality of through holes.

5. The asphalt temperature display device according to claim 1, The asphalt temperature display device is characterized in that the surface of the mounting portion that comes into contact with the asphalt pavement surface is oil-repellent.

6. An asphalt temperature display device according to any one of claims 1 to 5, An asphalt temperature display device characterized in that the predetermined temperature is 50°C.

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