JPH1161717A - Covering plate for roadwork - Google Patents

Abstract

PROBLEM TO BE SOLVED: To satisfy durability and water resistance while ensuring sufficient road-surface abrasion. SOLUTION: Silica sand 121 having grain size of approximately 0.6 mm, silica sand 122 having grain size of approximately 0.4 mm, rubber powder having grain size of approximately 0.3 mm and a urethane resin 124 are mixed by a mixer, and the mixed material is piled up on an iron plate, and heated and rolled in thickness of approximately 5-6 mm by a pressure roller. When the heated and rolled mixed material is cooled and solidified, an upper layer section 120 having durability and water resistance is formed onto the iron plate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lining plate for road construction, and more particularly to a structure of an upper surface portion forming a temporary road surface.

[0002]

2. Description of the Related Art The underground of public roads is used for housing so-called infrastructure equipment such as water and sewage pipes, gas pipes, power / communication wiring, subway lines, etc. For maintenance / repair of these equipments, It is inevitable to dig the road. However, even during construction,
Since road traffic cannot be blocked, lining boards are used to form temporary temporary road surfaces during the excavation work. A generally used lining plate has an iron plate portion having a size of approximately a tatami mat and an upper layer formed on the upper surface of the iron plate portion. The iron plate portion functions as a lining plate main body having a strength enough to withstand passage of the vehicle. On the other hand, the upper layer functions as a protective layer that protects the surface of the iron plate from corrosion and the like, and also functions as a friction layer that provides sufficient friction for vehicles running on temporary road surfaces.

In a conventional general lining plate, rubber is mainly used as a material of an upper layer portion. Usually, a thin rubber plate called a so-called rubber chip is attached on the iron plate portion. However, the lining plate using this rubber chip as the upper layer has the problem of poor durability.If it is used on a road with heavy traffic such as a large car, the rubber chip will be damaged and will be ragged and peeled off. The trouble that it ends up occurs. When a lining plate is used on a road surface with such heavy traffic, a lining plate formed by fixing silica sand with an epoxy resin-based binder material to form an upper layer portion is used instead of a rubber chip.

[0004]

As described above, a conventional lining plate generally used includes a rubber plate used as an upper layer, and silica sand fixed with an epoxy resin binder material to form an upper layer. It is known that a part is formed. However, these conventional lining plates each have advantages and disadvantages. In other words, as described above, the lining plate using the rubber chip as the upper layer has a problem that the upper layer is damaged and the upper layer is damaged and peels off when used on a road surface with heavy traffic, as described above. is there.

On the other hand, in a lining plate in which silica sand is fixed with an epoxy resin-based binder material to form an upper layer, the upper layer does not peel off, but cracks are easily generated in the upper layer. Another problem of lack of water resistance occurs. That is, the epoxy resin-based binder is strong in abrasion resistance but weak in impact, so that when an impact from a vehicle running on a road surface is transmitted, stress fracture occurs and cracks (so-called cracks) are easily generated. In particular, since the iron plate portion constituting the main body of the lining plate is bent every time the vehicle passes, the stress based on the bending is transmitted to the upper layer portion, so that the structure is easily cracked. . When such cracks are formed over the entire thickness of the upper layer portion, a problem occurs in water resistance. That is, rainwater permeates to the iron plate portion and causes corrosion of the iron plate portion.

Accordingly, an object of the present invention is to provide a lining plate which can satisfy both durability and water resistance.

[0007]

[Means for Solving the Problems]

(1) The first aspect of the present invention is to provide a lining plate used for forming a temporary road surface when constructing a road, an iron plate portion having sufficient strength as a temporary road surface, An upper layer portion is formed on the upper surface, and the upper layer portion includes rigid particles, elastic particles, and a binder material for fixing these particles to the iron plate portion.

(2) A second aspect of the present invention is the above-mentioned first aspect.
In the lining board for road construction according to the aspect, two or more kinds of particles having different particle diameters are mixed as the rigid body particles.

(3) The third aspect of the present invention is the above-mentioned second aspect.
In the lining board for road construction according to the above aspect, the first lining having a particle size suitable for securing sufficient friction as a temporary road surface.
And the second rigid particles having a particle size suitable for securing a sufficient adhesive area between the binder material and the second rigid particles.

(4) The fourth aspect of the present invention is the above-mentioned first aspect.
In the lining board for road works according to the third to third aspects, silica sand is used as the rigid particles.

(5) The fifth aspect of the present invention relates to the above-described fourth aspect.
In the lining plate for road construction according to the aspect, the particle size is 0.1.
Silica sand of 5 mm or more, and silica sand having a particle size of less than 0.5 mm,
Are mixed and used.

(6) The sixth aspect of the present invention is the above-mentioned first aspect.
In the lining board for road construction according to the fifth to fifth aspects, rubber powder is used as the elastic particles.

(7) The seventh aspect of the present invention is the above-mentioned first aspect.
In the lining board for road works according to the sixth to sixth aspects, urethane resin is used as a binder material.

(8) An eighth aspect of the present invention is the above-mentioned first aspect.
In the lining board for road works according to the seventh to seventh aspects, the upper layer further contains a black pigment.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings.

FIG. 1 shows a lining plate 10 for general road construction.
FIG. The lining plate 100 is a plate having a size substantially equivalent to one tatami mat, and usually has holes 10 at its four corners.
1 is formed. When the lining plate 100 is moved or laid, a hook of a crane is hooked on the hole 101, and the entire lining plate 100 is lifted by the crane for work. After the lining plate 100 is laid on the road surface, a safety cap is fitted into the hole 101.

FIG. 2 is a partial side sectional view of the lining plate 100. As shown in the drawing, the lining plate 100 has an iron plate portion 110 having sufficient strength as a temporary road surface, and an iron plate portion 11 having sufficient strength.
And an upper layer portion 120 formed on the upper surface of the C.O. In the conventional lining plate, a rubber chip was used as the upper layer portion 120, or silica sand was fixed with an epoxy resin-based binder material and used, but there was a problem that each had a lack of durability and water resistance. Has already been described.

The inventor of the present application conceived of a structure of a lining plate having both durability and water resistance and capable of providing a sufficient frictional force as a temporary road surface, and made prototypes under various conditions. However, we succeeded in obtaining an ideal lining plate. The gist of the present invention is that rigid particles and elastic particles are contained in the upper layer portion 120, and these particles are fixed on the upper surface of the iron plate portion 110 by a binder material. As described above, when the rigid particles and the elastic particles are mixed, it is considered that an ideal upper layer portion 120 is realized by a specific synergistic effect. Theoretical analysis has not yet been performed on the form of action of stress inside the upper layer portion 120 containing these two types of particles. However,
The inventor of the present application has assured the durability by the rigid particles, and can provide the required frictional force to the road surface. The affinity and adhesion between the particles are enhanced by the elastic particles. It is thought that it becomes possible to buffer the stress caused by the bending of the steel and suppress the occurrence of cracks.

Further, the inventors of the present invention have proposed that rigid particles are:
It has been found that mixing two or more kinds of particles having different particle sizes is more effective. Specifically, a first rigid body particle having a particle size suitable for securing sufficient friction as a temporary road surface and a particle suitable for securing a sufficient adhesive area between the binder material and the first rigid body particle. The second rigid particles having a diameter are mixed with each other, and these rigid particles are further mixed with the elastic particles to form the upper layer portion 120. FIG. 3 is a conceptual diagram showing the structure of the upper layer section 120 thus configured. In this example, a first rigid body particle 121 having a particle diameter of 0.6 mm and a second rigid body particle 122 having a particle diameter of 0.4 mm are used.
And the elastic particles 123 having a particle diameter of 0.3 mm are fixed by a binder material 124.

In this example, No. 4 silica sand is used as the first rigid particles 121, No. 5 silica sand is used as the second rigid particles 122, and rubber powder having a particle diameter of 0.3 mm is used as the elastic particles 123. ing. As the rigid particles, iron powder or hard glass spheres can be used, but silica sand is used because it has corrosion resistance, can secure a sufficient frictional force, and is inexpensive. Is most preferred. The mixing ratio of silica sand and rubber powder may be set as appropriate, but generally,
The higher the proportion of rubber powder, the more elastic upper layer 1
20 will be obtained. As an example, by weight, 4
When the No. silica sand is 45%, the No. 5 silica sand is 45% and the rubber powder is about 10%, a lining plate having practically sufficient elasticity can be formed.

According to an experiment conducted by the inventor of the present application, silica sand having a particle size of 0.5 mm or more is suitable for securing sufficient friction as a temporary road surface, and is required as a road surface defined by JIS standards. It is possible to secure a high coefficient of friction. On the other hand, silica sand having a particle size of less than 0.5 mm has properties suitable for securing a sufficient bonding area with a binder material. The larger the particle size of the silica sand, the more effective it is in securing friction on the road surface. However, as the particle size increases, the surface area per unit weight decreases, so that the bonding area with the binder material decreases, and it becomes impossible to secure a sufficient bonding area. If a sufficient adhesion area cannot be secured, peeling will occur, and a problem will occur in terms of durability. According to an experiment conducted by the inventor of the present invention, in the case of silica sand, the particle size is 0.5
mm as a boundary region, silica sand having a particle size of 0.5 mm or more has a dominant contribution to securing frictional force, and a particle size of 0.5 mm or more.
It has been found that the contribution to securing the adhesive force becomes dominant when the silica sand is less than mm.

In this example, a urethane resin is used as the binder material 124. As described above, a lining plate in which silica sand is fixed with an epoxy resin-based binder has been conventionally used, but in practicing the present invention, it is preferable to use a urethane resin as the binder. By mixing the elastic particles with the rigid particles, an effect of suppressing the occurrence of cracks due to the bending of the iron plate portion 110 can be expected. However, if a material having a certain degree of elasticity is used as the binder, this effect is further improved. be able to. Therefore, it is preferable to use a urethane resin rather than an epoxy resin as the binder material. In addition, since it is generally considered that the upper surface of the lining plate is preferably black, a black pigment may be further added to the urethane resin to make the entire upper layer portion 120 black.

If the upper layer portion 120 having such a structure is formed on the iron plate portion 110, a sufficient frictional force as a temporary road surface can be provided. Further, since a sufficient adhesive force is obtained between the particles, even when used on a road surface with heavy traffic, the upper layer portion 120 is hardly peeled off, and sufficient durability is obtained.
Furthermore, even if the iron plate portion 110 is bent or vibrated by the traffic of the vehicle, cracks are less likely to occur in the upper layer portion 120, and the iron plate portion 110 is hardly corroded by rainwater penetrating the cracks, ensuring sufficient water resistance. be able to.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Lastly, an optimum embodiment for producing a lining plate according to the present invention will be described. First, 1000mm x 2000
A 200 mm thick iron plate 110 having a thickness of 200 mm is prepared, and a primer (Model F-522 manufactured by Takeda Pharmaceutical Co., Ltd.) is applied to the upper surface. Subsequently, 4.5 kg of No. 4 silica sand (particle size of about 0.6 mm) and No. 5 silica sand (particle size of 0.
4.5 kg of rubber powder (particle diameter 0.3 mm)
1 kg), and put this in a mixer. Further, as a binder material, a urethane resin before curing (model number XF-146 manufactured by Takeda Pharmaceutical Co., Ltd.)
1.3 kg of 1), 6.5 g of a curing agent for urethane (model number Takelac XK-210 manufactured by the company), and a black pigment 10
0 g, and the mixture is stirred with a mixer for 5 minutes. In this manner, the agitated material 130 is put on the prepared iron plate portion 110 as shown in the side sectional view of FIG.
As shown in the side sectional view of FIG.
While applying moderate heat, a thickness of 5 mm
Roll to about 6 mm. If left as it is for about 12 hours, an upper layer portion 120 solidified on the iron plate portion 110 is obtained.

[0025]

As described above, according to the lining plate for road construction according to the present invention, since the rigid particles and the elastic particles are contained in the upper layer, both durability and water resistance are satisfied. Can be done.

[Brief description of the drawings]

FIG. 1 is a perspective view of a general road construction lining plate 100. FIG.

FIG. 2 is a partial side sectional view of the lining plate 100 shown in FIG.

FIG. 3 is a conceptual diagram showing a structure of an upper layer portion 120 of a lining plate according to the present invention.

FIG. 4 is a side sectional view showing a first manufacturing process of the lining plate according to the present invention.

FIG. 5 is a side sectional view showing a second manufacturing process of the lining plate according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 100 ... Lining board 101 ... Hole part 110 ... Iron plate part 120 ... Upper layer part 121 ... 1st rigid body particle (No. 4 silica sand) 122 ... 2nd rigid body particle (No. 5 silica sand) 123 ... Elastic body particle (rubber) Powder) 124 binder material (urethane resin) 130 agitated material 140 rolling roller

Claims (8)

[Claims] Claims: 1. A lining plate used for forming a temporary road surface when constructing a road construction, an iron plate portion having sufficient strength as a temporary road surface, and formed on an upper surface of the iron plate portion. An upper layer portion, wherein the upper layer portion includes a rigid body particle, an elastic body particle, and a binder material for fixing these particles to the iron plate portion; Board. 2. The lining board according to claim 1, wherein two or more kinds of particles having different particle diameters are mixed as the rigid body particles. 3. The lining board according to claim 2, wherein the first rigid particles having a particle size suitable for securing sufficient friction as a temporary road surface and the binder material are sufficiently provided. And a second rigid body particle having a particle size suitable for securing a large bonding area. 4. The lining board according to claim 1, wherein silica particles are used as the rigid particles. 5. The road construction according to claim 4, wherein a mixture of silica sand having a particle size of 0.5 mm or more and silica sand having a particle size of less than 0.5 mm is used. Lining board. 6. The lining board according to claim 1, wherein rubber particles are used as the elastic particles. 7. The lining board according to claim 1, wherein a urethane resin is used as a binder material. 8. The lining board for road construction according to claim 1, wherein the upper layer further contains a black pigment.