JP2990059B2 - Tunnel interior material and tunnel interior structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interior material attached to an inner wall surface of a tunnel such as a motorway tunnel, and more particularly to an interior material for a tunnel having a fluororesin surface layer.

[0002]

2. Description of the Related Art Interior materials are often mounted on the inner wall of a tunnel such as a motorway tunnel in consideration of aesthetics, lighting effects, etc., but the surface of the interior surface is susceptible to soot and dust contained in exhaust gas of a passing vehicle. The cleaning work is regularly performed because the interior functions are lost due to the extremely dirty in a short period of time. However, the conventional interior materials are difficult to remove dirt, so that the cleaning operation is very time-consuming and requires the use of a detergent. Therefore, there is a problem that secondary pollution is caused by discharge of the cleaning water. When the surface of the interior material is a normal resin surface or metal surface, SOx, NOx,
There is also a problem that the function as an interior material is lost in a short period of time due to being attacked by a solvent component or the like.

In recent years, interior materials for tunnels in which the surface of a substrate is covered with a fluororesin layer have appeared (for example, Japanese Patent Application Laid-Open No. 4-143400, Japanese Utility Model Application Laid-Open No.
No. 57977). In such interior materials for tunnels, the fluorocarbon resin on the surface is extremely inert chemically and physically, so it is difficult for dirt to adhere, and even if dirt adheres, interaction with the surface is poor. It can be easily washed off with ordinary water, no detergent is required, and there is no need to scrape off with a brush, etc. In addition, since it has excellent chemical resistance, there is an advantage that corrosion and dissolution due to exhaust gas components do not occur and durability is excellent.

[0004]

However, in general, fluororesins have high insulating properties (usually, 10 ¹⁸ as electric resistance).
Ωcm), it is easy to be charged, and especially in a tunnel, since there is a constantly strong airflow due to vehicle traffic and the introduction of outside air, using an interior material having the surface of the conventional fluororesin layer, Due to static electricity generated by friction with air, the surface of the fluororesin layer is charged to an extremely high negative potential, while soot and dust contained in vehicle exhaust gas are positively charged. Even if washed as described above, soot and dust are adsorbed by the electrostatic suction force and immediately become black,
There is a disadvantage that the appearance of the stain is rather faster than the interior material using other materials for the surface.

[0005] Even if the substrate 11 is made of metal and the fluororesin layer 12 is directly bonded to the substrate 11 as in the case of the interior material B for tunnel shown in FIG. Since the charge is concentrated on the surface layer portion, and the charge transfer through the thickness (normally about 0.1 to 1 mm) of the fluororesin layer 12 is hard to occur due to the high insulation property, the static elimination effect by the substrate 11 is slightly reduced. It has little effect on preventing the positively charged soot and dust 13 from adhering to the surface. It is also conceivable to mix conductive particles such as carbon into the fluororesin layer 12 for the purpose of preventing static charge. However, in such a configuration, the fluororesin layer 12 is colored black, so that the lighting effect should be considered. It cannot be used as an interior material for tunnels.

In view of the above situation, the present invention provides a tunnel interior material whose surface is made of a fluororesin, which can suppress the surface charging to an extremely low level, and thus, soot and dust due to electrostatic attraction. It is an object of the present invention to provide a tunnel interior structure capable of maintaining a fluorine resin original clean surface for a long period of time after construction and cleaning by using the interior material while providing a material that is unlikely to cause stains on the surface. .

[0007]

According to a first aspect of the present invention, there is provided a tunnel interior material according to the first aspect of the present invention, in which the surface of the metal substrate 1 is made of a fluororesin, A configuration is adopted in which projections 3... Reaching the surface of the fluororesin layer 2 at a plurality of locations on the metal substrate 1 are provided. Interior material A having such a configuration
According to this, even if the surface layer of the fluororesin layer 2 is charged while being attached to the inner wall surface 6a of the tunnel, the projections 3 of the metal substrate 1 are in direct contact with this surface layer. The negative charge of the fluororesin layer 2 moves to the metal substrate 1 side through the substrate, thereby lowering the charged potential on the surface of the fluororesin layer 2, preventing the soot and dust that are positively charged from adhering due to the electrostatic attraction force, Thus, the inherent antifouling function of the fluororesin due to its extremely inertness physically and physically is fully exhibited. Since the metal substrate 1 is grounded to the tunnel body through the mounting frame or the like, no special ground wiring is required.

According to the second aspect of the present invention, in the tunnel interior material A of the first aspect, the fluororesin layer 2 is made of a fluororesin film 2a, and the projections 3 of the metal substrate 1 are formed by holes in the substrate 1. A configuration including a burr 3a at the edge of the hole formed by drilling is adopted. Therefore, when manufacturing the interior material A, the projections 3 can be efficiently and easily formed by a punch-through type drilling process such as a burring process on the metal substrate 1, and the above-mentioned fluorine is formed on the burr 3a forming surface of the substrate 1. When the resin film 2a is placed thereon and pressed and leveled by a roller R or the like, the sharp burrs 3a pierce the fluororesin film 2a and come out to the surface, so that the metal substrate 1 and the fluororesin film 2a can be laminated and integrated. At the same time, the protrusions 3 can be led out to the surface of the fluororesin layer 2, and the protruding burrs 3a are crushed and flattened by pressing and leveling, so that the problem of catching by the burrs 3a can be solved at once. become.

According to the third aspect of the present invention, the first or second aspect is provided.
In the tunnel interior material A, a glass woven fabric 4 is interposed between the fluororesin layer 2 and the metal substrate 1, and the glass woven fabric 4 and the metal substrate 1 are joined via an adhesive 5. Is adopted. Therefore, the fluororesin layer 2 is originally difficult to adhere to the metal substrate 1 because the surface is inactive.
Is an anchor effect by heat compression bonding or a hot-melt fluororesin, which can be bonded by melt coating. By bonding the glass woven fabric 4 and the metal substrate 1 with a normal adhesive 5, the fluororesin layer 2 Can ensure the peel resistance. Also,
The obtained interior material A has a milky white surface because the white glass woven fabric 4 is present on the back surface of the translucent fluororesin layer 2.

In the tunnel interior structure according to a fourth aspect of the present invention, the tunnel interior material A according to any one of the first to third aspects is mounted on the tunnel inner wall surface 6a with the fluororesin layer 2 facing the inside of the tunnel 6. Because of the configuration, the antistatic effect and the inherent inertness of the fluorocarbon resin make it difficult for soot and dust to adhere to the interior surface, and can maintain a clean state for a long time after construction and after cleaning. ,
Even if soot and dust adhere over time, they can be easily washed off with ordinary water.

[0011]

1 to 3 show a tunnel interior material A according to an embodiment of the present invention. As shown in the figure, the interior material A is a laminate in which a glass woven fabric 4 and a fluororesin layer 2 are sequentially laminated on a metal substrate 1 and has a height h of 1.
About 2 m, the width w is about 1 to 5 m, and is formed into a curved rectangular shape having a concave portion on the fluororesin layer 2 side corresponding to the curved surface of the inner wall surface of the tunnel to be applied in the vertical direction. Through holes 7 for screwing are formed. Reference numeral 5 denotes an adhesive bonding the metal substrate 1 and the glass woven fabric 4.

In this tunnel interior material, a large number of projections 3 are arranged on the surface of the metal substrate 1 at predetermined intervals.
Are projected, and these projections 3 penetrate the glass woven fabric 4 and the fluororesin layer 2 and are exposed on the surface of the fluororesin layer 2. The thickness of the metal substrate 1 is 0.2 to 2
mm, and the thickness of the glass woven fabric 4 and the fluororesin layer 2 is about 0.1 to 1 mm.

Here, the material of the metal substrate 1 is not particularly limited, but stainless steel or an aluminum alloy is preferable for preventing rust. The material of the fluororesin layer 2 is not particularly limited, but is preferably a tetrafluoroethylene-based fluororesin. Specific examples thereof include tetrafluoroethylene resin (trade name: Teflon PTFE, Fluon, etc.), copolymer resin of ethylene tetrafluoride and perfluoroalkyl vinyl ether (trade name: Teflon PFA), ethylene tetrafluoride and perfluoroethylene Ternary copolymer resin of fluoroalkyl vinyl ether and propylene hexafluoride (trade name: Teflon E
PE), a copolymer resin of ethylene tetrafluoride and propylene hexafluoride (trade name: Teflon FEP), a copolymer resin of ethylene tetrafluoride and ethylene (trade name: Tefzel), and the like.

To manufacture such an interior material A for a tunnel, first, as shown in FIG. 4, the metal substrate 1 is ruptured at predetermined intervals by a piercing method such as burring. The holes 10 are formed. This drilling is to break through the metal substrate 1 with the pins P as shown by the imaginary line in the figure, and sharp burrs 3a projecting to one surface side are formed at the edge of the formed rupture hole 10. .

Next, as shown in FIG.
The adhesive 5 is applied to the surface on which the burrs 3a are formed, and the fluororesin film 2
a and the glass woven cloth 4 are integrated with the sheet 20 and the glass woven cloth 4
Place it so that the side is the joint surface. In this mounted state, the sheet 20 is lifted up by the burrs 3a at the positions of the rupture holes 10, but is pressed by the rollers R from above the sheet 20 as shown by the imaginary line in FIG. Burrs 3a are glass woven fabric 4 and fluororesin film 2
The burrs 3a that pierce a and emerge from the surface ...
Are crushed and flattened to form the protrusions 3 b. At the same time, the metal substrate 1 and the glass woven fabric 4 are joined and integrated via the adhesive 5.

The laminate thus obtained is bent into a curved shape having a concave on the fluororesin layer 2 side so as to correspond to the curved surface of the inner wall surface 6a of the tunnel 6 to be applied (see FIGS. 6 and 7).
This is referred to as tunnel interior material A. The interior material A has a milky white surface due to the presence of the white glass woven cloth 4 on the back surface of the translucent fluororesin layer 2, and the tips of the projections 3 are flattened. There is no snagging.

In order to mount the tunnel interior material A on the inner wall surface of the tunnel, as shown in FIG. 6, the mounting frame 8 having the screw holes 8a. The interior material A may be fixed to these mounting frames 8 with screws 9 using the upper and lower through holes 7. It is recommended that the screw 9 be made of a fluororesin from the viewpoints of corrosion resistance and stain resistance. FIG. 7 is a cross section of the tunnel 6 after the construction, and the interior material A has the inner walls 6a, 6 on both sides.
a. Note that 6 in FIG.
0 indicates a lighting fixture.

Thus, in the tunnel interior material A attached to the inner wall surface 6a of the tunnel 6, the surface layer of the fluororesin layer 2 is negatively charged by friction with air due to the airflow in the tunnel 6. The electric charges move to the metal substrate 1 through the projections 3 reaching the surface layer, and are grounded by the tunnel frame from the mounting frames 8, so that the surface layer is suppressed to a low charged potential. Note that this charging potential is not uniform over the entire surface of the fluororesin layer 2 and increases with distance from the projections 3... Low potential below a certain value (usually 1
0 become ^{6 Ω} · cm or less) to be suppressed it.

Therefore, the surface of the tunnel interior material A is maintained at a low potential at which the charging potential does not cause soot and dust to be attracted by electrostatic attraction, and chemical and physical dirt is also removed from the fluororesin. Since the surface activity is suppressed by the low surface activity, the surface is kept clean for a long period after the interior material A is installed or after the regular cleaning, and a good lighting effect due to the milky white color of the surface is obtained. In addition, since the surface is made of a fluororesin, dirt can be easily removed only by applying water without using a detergent in regular cleaning, and excellent durability is exhibited without corrosion or dissolution due to exhaust gas components.

In the above embodiment, the protrusions 3 on the metal substrate 1 are used.
Are formed by burrs 3a by drilling,
In the invention of claim 1, the projections 3 may be formed by other means such as cutting and raising the metal substrate 1. In the interior material for a tunnel according to the present invention, the design, such as the size, arrangement interval and arrangement of the projections 3,... In the tunnel interior structure of the embodiment, the interior material A for a tunnel curved in the vertical direction is shown, but the interior material may be flat. However, when attaching a flat interior material to the curved tunnel inner wall 6a surface, the interior material may be arranged so as to leave a space between the inner surface and the inner wall surface as shown by the imaginary line in FIG.

In particular, the invention of claim 1 includes a configuration in which the fluororesin film 2a to which the glass woven fabric 4 is not bonded is directly heated and pressed on the surface of the metal substrate 1 alone. When such a fluororesin film 2a is used alone, it is desirable to roughen the surface of the metal substrate 1 in order to ensure peel resistance. When the glass woven fabric 4 is used, in addition to forming the fluororesin layer 2 with the fluororesin film 2a, a heat-fusible fluororesin is used, and this is melt-coated on the glass A configuration in which the resin layer 2 is used can also be adopted.

[0022]

According to the first aspect of the invention, as a tunnel interior material whose surface is made of a fluororesin, the surface charging can be suppressed to an extremely low level, so that the soot and dust due to the electrostatic attraction force can be reduced. An object is provided in which dust is hardly adhered and which maintains a clean surface for a long time after construction on a tunnel inner wall or after periodic cleaning.

According to the second aspect of the present invention, a particularly easy-to-manufacture material is provided as the tunnel interior material.

According to the third aspect of the present invention, since the glass woven fabric is interposed between the metal substrate and the fluororesin layer as the interior material for the tunnel, a normal adhesive is used for bonding to the metal substrate. It is easy to manufacture, and the peel resistance of the fluororesin layer can be set large, and the surface is milky white and gives a good lighting effect as a tunnel interior.

According to the invention of claim 4, since the above-mentioned interior material for a tunnel is used in the interior structure of the tunnel, it is difficult for soot and dust to adhere to the interior surface of the interior surface due to the electrostatic attraction force, so that the interior surface can be used after or after the construction. There is an advantage that a clean interior surface can be maintained for a long time after a typical washing, and that the adhered dirt can be easily washed off with ordinary water during the washing.

[Brief description of the drawings]

FIG. 1 is a perspective view of an interior material for a tunnel according to one embodiment of the present invention.

FIG. 2 is a plan view of a main part of the interior material.

FIG. 3 is a sectional view of a main part of the interior material.

FIG. 4 is a sectional view of a main part of a metal substrate used for the interior material.

FIG. 5 is a sectional view showing a joining operation of a sheet made of a fluororesin film and a glass woven fabric to a metal substrate in the production of the interior material.

FIG. 6 is a perspective view showing an operation of attaching the interior material to the inner wall surface of the tunnel.

FIG. 7 is a sectional view showing a tunnel interior structure to which the interior material is attached.

FIG. 8 is a cross-sectional view of a tunnel interior material according to a conventional configuration.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal substrate 10 Rupture hole 2 Fluororesin layer 2a Fluororesin film 3 Projection 3a Burr 4 Glass woven cloth 5 Adhesive 6 Tunnel 6a Tunnel inner wall A Tunnel interior material R Roller

Claims (4)

(57) [Claims] 1. An interior material for a tunnel, wherein a surface of a metal substrate is covered with a fluororesin layer, and projections reaching the surface of the fluororesin layer are provided at a plurality of positions on the metal substrate. 2. The interior material for a tunnel according to claim 1, wherein the fluororesin layer is made of a fluororesin film, and the projections of the metal substrate are made of burrs on the edge of the substrate formed by punching. 3. The tunnel according to claim 1, wherein a glass woven fabric is interposed between the fluororesin layer and the metal substrate, and the glass woven fabric and the metal substrate are joined via an adhesive. For interior materials. 4. A tunnel interior structure in which the interior material for tunnel according to any one of claims 1 to 3 is attached to an inner wall surface of the tunnel with the fluororesin layer facing the inside of the tunnel.