JP3197886B2 - Ballast coating method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ballast coating method for obtaining a coating ballast by applying a wear-resistant material to a ballast used in a railway track.

[0002]

2. Description of the Related Art Conventionally, a railroad track generally has a structure in which sleepers are arranged on a roadbed formed on a roadbed, and two rails are mounted on the trackbed at regular intervals in parallel. In particular,
As shown in FIG. 5, a ballast ballast track 51 using a ballast 53 such as gravel or crushed stone, by its nature, is capable of transmitting a load transmitted from a train via rails 55, 55 and sleepers 54 to a roadbed 5.
6 has been adopted for many years because it is able to rationally support the running of heavy vehicles by distributing it evenly, improve the drainage of the track and prevent the generation of mud and weeds, and is economically excellent. I have.

[0003] As a material of the ballast 53, natural rocks such as andesite, hard sandstone and granite are mainly used.
Various tests (weight per unit volume, water absorption rate, abrasion rate, hardness, water absorption pressure resistance, compression crushing rate) and those that pass the standards are adopted. Then, the ballasts 53 having various particle sizes (particle sizes) that have passed the standard are appropriately mixed and used as the roadbed 52.

[0004] However, the ballast 53 gradually wears and crushes due to the repeated load of train running and the external force caused by compaction work by MTT (Multiple Tie Tamper), and becomes finer with age. If the ballast 53 becomes finer, the muddy water, poor track bed settlement, floating pillows (the bottom of the pillows will sink and the pillows will float) due to poor drainage, etc. will be generated, and the bearing as a bearing for the track Lack of stability causes the roadbed 52 to not perform its original function.
Therefore, it is necessary to permanently perform maintenance work such as replacing the ballast 53 with a completely new ballast 53 to replace the ballast 53, and a great deal of labor has been devoted to the maintenance work.

[0005] In order to prevent ballast subsidence due to the above-mentioned ballast refinement, various coating ballasts in which the surface of the ballast is covered with various coating materials have been proposed. As such a coating ballast, for example, a coating ballast having a polymer emulsion film formed on the surface thereof has been proposed in Japanese Patent Application Laid-Open No. 9-241084.

The above publication discloses a dipping method as shown in FIG. 6 as a method of coating a coating material. That is, a plurality of ballasts 61 are put in a basket 62 and a coating material (polymer emulsion)
A coating ballast having a polymer emulsion film formed on the surface thereof is obtained by immersing in a container 63 containing 64, followed by lifting, natural drying or heat drying.

[0007]

However, in the coating method as shown in FIG. 6, a curing method (drying and curing of the coating material 64) after the ballast 61 is pulled out of the coating material 64 is as follows. Due to a problem, it has not been put to practical use.

First, a plurality of ballasts in the basket 62 immersed in the coating material 64
Since the ballast is dried as it is after being lifted from 4, the plurality of ballasts adhere to each other by the coating material 64, and the plurality of ballasts in the basket 62 become one large lump. Such a ballast mass is very heavy and very difficult to handle. Even if the mass is to be separated into individual ballasts again, a very large mechanical force is required, and if such a mechanical force is applied, the ballast itself will be damaged.

In order to prevent the ballast from clumping during curing, a method of arranging the ballast in the basket 62 in a planar manner after pulling it up from the coating material 64 is conceivable. However, it is not practical because a large area is required only for the ballast to be coated.

[0010] Even if the coating material is spread and cured on a flat plate or a corrugated sheet as described above, the excess coating material before hardening drips before the coating material hardens. If it is dried as it is, as a result, a ballast having a non-uniform coating thickness with unnecessary portions (burrs) having a protruding shape formed on the part will result. If such a ballast having burrs is used, the contact point between the ballasts becomes too soft, and the amount of subsidence caused by a load such as a train passing increases. In addition, basket 6
It is expected that the same problem (burr formation) will occur even when curing is performed in the state of being placed in No. 2. For this reason, after curing, it is necessary to further remove the burrs with a cutter or the like to correct the shape, which requires a lot of man-hours to remove the burrs, which is extremely inefficient.

The present invention has been made in view of the above problems, and has as its object to efficiently coat a ballast with a coating material.

[0012]

Means for Solving the Problems, Embodiments of the Invention and Effects of the Invention Claims have been made to achieve the above object.
The ballast coating method according to the method described above, a wear-resistant material is applied to the surface of a ballast base material, and the applied wear-resistant material is cured to form a coating ballast whose entire surface is coated with the wear-resistant material. A method for obtaining, wherein the applied ballast obtained by applying the wear-resistant material to the surface of the ballast base material has at least water, a surfactant, and a density equivalent to that of the applied ballast. The applied ballast is immersed and floated in a curing slurry containing inorganic mineral particles as a component for curing the abrasion-resistant material in the curing slurry.

In the above-mentioned coating method, first, a ballast base material is prepared. In general, ballast base materials are required to have various conditions such as material strength, abrasion resistance, weathering resistance, and the ability to collect a large amount and low price.
For example, natural rocks such as andesite, granite, hard sandstone, basalt, and diorite can be used. In addition, since the particle size distribution of the ballast in the ballast ballast for the railway track is determined, for example, as shown in Table 1 below, the natural rock is appropriately pulverized with a crusher or the like to conform to the particle size shown in Table 1 below. Only the ballast base material.

[0014]

[Table 1]

[0015] In Table 1, the percentage of passing weight is obtained by superimposing five types of screen sieves sequentially from the one having the smaller nominal size to the one having the larger size, and drying the sample on the oven (ballast).
Is sieved by vibrating the screen sieve, the mass of the particles passing through each screen sieve is measured, and the percentage of the total weight of the sample with respect to each is determined.
3 shows the particle size distribution.

When a ballast base material having a predetermined particle size is obtained, a wear-resistant material is applied to the entire surface of the ballast base material. The wear-resistant material is applied in order to prevent the progress of ballast refinement due to an external force such as a train load or the like. Examples of such a wear-resistant material include a two-component mixed polyurethane resin and a two-component resin. A polymer material such as a mixed epoxy resin, a two-part mixed silicone, a two-part mixed paint, or a polymer emulsion can be used, but has a predetermined viscosity to be applied to an appropriate film thickness. In consideration of the necessity and wear resistance performance, the viscosity is 4-20P.
It is more preferable to use a two-component mixed polyurethane resin of a · s.

The application of the wear-resistant material may be performed by, for example, putting a ballast base material in a plastic container or the like, further adding the wear-resistant material thereto, and mixing. The size of the container for holding the ballast base material and the wear-resistant material may be appropriately determined in consideration of the amount of the ballast base material applied at a time, the amount of the wear-resistant material, and the like. The amount of the wear-resistant material to be used may be appropriately determined so that the entire surface of the ballast base material can be sufficiently applied and the surplus amount after application is as small as possible. It is more preferable to use a rotating drum type container, for example, because the wear-resistant material can be uniformly and efficiently applied to the entire surface while rotating the ballast base material in the container. Before applying the wear-resistant material, it is desirable that the surface of the ballast is previously washed with water to remove mud, dust, and the like attached to the surface.

After the applied ballast is obtained by applying the wear-resistant material to the entire surface of the ballast base material, the wear-resistant material is cured. The term “curing” as used herein means that the abrasion-resistant material on the surface of the applied ballast is sufficiently cured for a predetermined time, and as a result, the coating ballast in which the surface of the ballast base material is coated with the abrasion-resistant material Can be obtained. Curing is performed by immersing the applied ballast in a curing slurry composed of the above-mentioned components and floating the ballast in the slurry.

Here, when the applied ballast coated with a wear-resistant material such as a polymer material is immersed in water, the completely hardened wear-resistant material is separated from the surface of the ballast base material due to surface tension. The surface finish of the coating ballast after shrinking and curing is likely to be poor. To prevent this, a surfactant is required as a component of the curing slurry.

Examples of the surfactant include anionic surfactants such as fatty acid soaps, alkyl sulfonates, alkylbenzene sulfonates, and alkali naphthalene sulfonates, dimethyl alkyl ammonium chloride, and choline ester chlorides of linear fatty acids. All kinds of surfactants such as cationic surfactants, amphoteric surfactants such as carboxylic acid type, sulfate ester type, sulfonic acid type and phosphate ester type, and nonionic surfactants such as polyoxyethylene nonylphenyl ether It can be used and may be appropriately determined in consideration of the wear-resistant material to be applied and the like so as to obtain a good coating film of the wear-resistant material.

Further, when the applied ballast completely sinks in the curing slurry, a plurality of applied ballasts come into contact with each other, and when the abrasion-resistant material is hardened in that state, the ballasts mutually become less abrasion-resistant. It sticks to the material and becomes one big lump. To prevent this, the density of the curing slurry must be equal to the density of the applied ballast. For this purpose, inorganic mineral particles for ensuring a predetermined density are added as a component of the curing slurry. As the inorganic mineral particles, any material may be used as long as the density of the curing slurry can be made equal to the density of the applied ballast, for example, using silica powder obtained by grinding silica into fine particles.

When the applied ballast is immersed in the above-mentioned curing slurry, each of the applied ballasts floats in the curing slurry, and is cured as it is for about half a day to one day. After curing, the coating ballast in which the coating film is formed from the cured abrasion-resistant material is taken out of the curing slurry, and the curing slurry attached to the surface is removed by washing with water or the like, thereby completing the coating operation. .

Therefore, according to the above-mentioned coating method, since the applied ballast is cured by being immersed in a curing slurry and floated, it is difficult for the ballasts to come into contact with each other during curing. A coating ballast having an excellent surface state can be obtained. Also,
Since a plurality of applied ballasts can be cured three-dimensionally in the curing slurry, the space required for curing can be reduced, and efficient coating can be achieved.

In the above method, a coating ballast having a good surface condition can be efficiently obtained. However, immediately after the wear-resistant material is applied to the ballast base material, the applied ballast is placed in the curing slurry. If it is added, the coating thickness of the abrasion-resistant material after curing may not be a desired thickness. That is, immediately after the application of the wear-resistant material, since the wear-resistant material is not cured, the uncured wear-resistant material may flow into the curing slurry. It will be thin.

Therefore, a ballast coating method according to a second aspect is the ballast coating method according to the first aspect, wherein the applied ballast is precured for 5 to 30 minutes before being immersed in the curing slurry. A time is provided to initially cure the wear-resistant material on the surface of the applied ballast.

Here, the pre-cure time is used for initially hardening the abrasion-resistant material applied to the ballast base material (that is, for hardening the abrasion-resistant material to a viscosity that does not flow out into the curing slurry). Time. If the pre-curing time is less than 5 minutes, the effect of providing the pre-curing time is reduced. Conversely, if the pre-curing time is more than 30 minutes, the reaction (hardening) of the abrasion-resistant material proceeds, the viscosity increases, and Are easily fixed, and the workability of applying the wear-resistant material is deteriorated. When applying a wear-resistant material having a relatively short curing time, such as a two-component mixed polyurethane resin, if the pre-curing time exceeds 15 minutes, the viscosity of the wear-resistant material increases and workability increases. Since it becomes worse, it is preferable to provide a pre-cure time of 15 minutes or less. After the precure time has elapsed, the applied ballast is immersed in the curing slurry.

Therefore, according to the above-described coating method, the applied ballast is initially cured after providing a pre-curing time, and then is put into the curing slurry, so that the applied wear-resistant material may flow out into the curing slurry. And a coating film having a desired thickness can be obtained more reliably.

In the ballast coating method according to the first or second aspect, by setting the density of the curing slurry to be equal to the density of the applied ballast, the ballast can be three-dimensionally cured while floating in the curing slurry. However, during the process of immersing (injecting) multiple coated ballasts into the curing slurry, or during curing, if the container containing the curing slurry moves for some reason, the applied ballast in the curing slurry may There is a risk of mutual contact.

In particular, after the immersion (injection) of the plurality of applied ballasts into the curing slurry is started, the immersion of all the applied ballasts is completed, and the ballast is stopped in a state where each applied ballast is floating in the curing slurry ( Until the steady state is reached), the applied ballasts are likely to come into contact with each other, which may lead to poor surface condition of the wear-resistant material.

Therefore, a ballast coating method according to claim 3 is a ballast coating method according to claim 1 or 2, wherein the curing slurry has a viscosity of 10 to 10 by containing a thickener as a component. It is characterized by being 100 Pa · s. In general, the higher the viscosity of a liquid, the greater the property of retaining the solid in the liquid. Therefore, when the curing slurry has a predetermined viscosity, the risk of contact between the applied ballasts is reduced. If the viscosity is less than 10 Pa · s, the property of retaining each applied ballast in the curing slurry cannot be sufficiently obtained, and the applied ballast tends to move in the curing slurry, and the risk of contact between ballasts increases. In addition, the viscosity is 100 Pa
When s is exceeded, the applied ballasts are less likely to come into contact with each other, but the fluidity of the curing slurry is reduced, and after the curing slurry is treated and cured, the ballast is removed from the curing slurry and the curing slurry attached to the ballast is removed. Work becomes difficult. Therefore, the viscosity of the curing slurry is desirably in the above range.

Examples of the thickener include inorganic compounds (talc, mica, smectite, bentonite, magnesium aluminum silicate, etc.), high molecular polysaccharides (ramsangum, xanthan gum, guar gum, etc.), cellulose derivatives (methylcellulose, ethylcellulose, hydroxyethylcellulose). Etc.), starches (such as hydroxypropyl starch), and synthetic polymers (such as polyvinyl alcohol, polyvinyl pyrrolidone, polyvinyl methyl ether, and polyacrylamide) as long as they can obtain the desired viscosity.

According to the above-mentioned coating method, by keeping the viscosity of the curing slurry within a predetermined range, each applied ballast in the curing slurry becomes more difficult to contact.
A coating ballast having a better surface condition can be obtained. The ballast coating method according to claim 4 is the ballast coating method according to any one of claims 1 to 3, wherein the amount of the surfactant is 1 to 5
% By weight.

When the content of the surfactant is less than 1% by weight, the effect of containing the surfactant as described above is hardly obtained, and the surface finish state of the cured coating ballast becomes poor. Cheap. On the other hand, even if the content exceeds 5% by weight, there is almost no difference in the finished state of the coating ballast.
The more it is, the higher the cost, simply with little effect. for that reason,
The content of the surfactant is desirably 1 to 5% by weight.

According to the ballast coating method described above, by making the content of the surfactant necessary and sufficient, the waste of the cost of the surfactant can be eliminated, and the more efficient and economical ballast can be obtained. Coating becomes possible. The ballast coating method according to claim 5,
A method for obtaining a coating ballast in which the entire surface is coated with the wear-resistant material by applying a wear-resistant material to the surface of the ballast base material and curing the applied wear-resistant material. An applied ballast obtained by applying an abradable material to the surface of the ballast base material
Is charged into a container containing the granules, and the powder is placed in the container.
The method is characterized in that the abrasion-resistant material is cured by coating particles on the applied ballast and covering the entire surface of the applied ballast with the powder.

In the above-described coating method, first, a ballast base material having a predetermined particle size for applying the wear-resistant material is prepared, and the wear-resistant material is applied to the entire surface of the ballast base material. Get the ballast. The procedure up to this point is exactly the same as the ballast coating method according to the first aspect, so that the description is omitted here.

The term "granules" as used herein means an aggregate of particles having a predetermined particle size, such as powder. The method of dusting the applied ballast is, for example, to put a predetermined amount of powder in a container or the like in advance, put the applied ballast and roll it, etc. What is necessary is just to completely cover the whole surface of the applied wear-resistant material) with the granular material, and the method is not particularly limited.

As the powder, for example, silica sand, alumina,
Various powders such as silica and nylon powder can be used. If the particle size of the powder is too large, it may not sufficiently adhere to the entire surface of the applied ballast. Therefore, the maximum particle size is preferably 2 mm or less.

Once the powdery granules are spread over the entire surface of the applied ballast, the ballast is allowed to cure for about half a day to one day. After curing, the coating ballast is separated from excess powder and granules by, for example, sieving, thereby completing the coating operation. Therefore, in the coating ballast obtained by the method of the present invention, a film made of adhered particles is further formed on the coating film made of the wear-resistant material.

According to the above-mentioned coating method, by covering the entire surface of the applied ballast with the granular material, the uncured wear-resistant material can be prevented from dripping during curing. A coating ballast having no burr and having a desired coating film thickness can be obtained without providing a pre-curing time as in the coating method of (1). In addition, polymer materials are generally susceptible to deterioration such as the chalking (chalking) phenomenon due to ultraviolet rays. Therefore, if the above-mentioned polymer material is used as the abrasion-resistant material, the surface of the coating ballast will deteriorate over time. There is a risk of deterioration. However, since the entire wear-resistant material is covered with the granular material, deterioration due to ultraviolet rays can be significantly reduced, and the life of the coating ballast can be extended.

Further, when silica powder having a particle size of No. 150 or more is used as the granular material as in the ballast coating method according to the sixth aspect, the powder easily adheres to the applied ballast with an appropriate particle size and is economical. Is more preferable because it can be obtained at low cost. In addition, “granularity” as used herein refers to JIS G
5901 ("silica for mold") according to the particle size classification (maximum particle size: No. 10 to minimum particle size: 200). That is, “particle size of 150 or more” refers to those having a particle size of 150 or smaller.

A ballast coating method according to a seventh aspect is the ballast coating method according to any one of the first to sixth aspects, wherein the ballast coating method is for improving the adhesion of the wear-resistant material to the ballast. Preferably, a primer is applied to a surface of the ballast base material before applying the wear-resistant material to the ballast.

As the primer, there can be used, for example, a solvent-type epoxy resin, a solvent-type polyurethane resin, an emulsion-type epoxy resin, etc., regardless of the solvent type, the non-solvent type, or the emulsion type, which has an affinity for the wear-resistant material. Can be used. As with the application of the wear-resistant material, the primer is uniformly applied to the entire surface of the ballast base material by, for example, putting a ballast base material in a plastic container or the like and mixing a predetermined amount of the primer into the ballast base material. The method is not particularly limited as long as the method is performed. After applying the primer, the primer may be sufficiently cured, for example, over about one day.

According to the above-mentioned coating method, the primer is applied before the wear-resistant material is applied to the ballast base material, and the wear-resistant material is applied thereon. Compared to applying abrasive materials,
The adhesion between the wear-resistant material and the ballast base material is further improved. As a result, the life of the coating ballast can be further extended.

The embodiments of the present invention are not limited to the above-mentioned embodiments at all, and it goes without saying that various forms can be adopted as long as they fall within the technical scope of the present invention. For example, the ballast base material is not limited to natural rock as described above, but may be any material, such as ceramics, that satisfies the conditions such as physical properties as a ballast.

In the above embodiment, when curing is performed in the curing slurry, the curing slurry is put in a plastic container or a rotating drum type container, and the applied ballast is directly immersed in the curing slurry. However, the present invention is not limited to this. For example, the curing slurry is placed on a belt conveyor, the applied ballast is placed thereon, and the curing slurry is further placed thereon (that is, the applied ballast is covered with the curing slurry). Alternatively, the applied ballast may be collected together with the curing slurry in a predetermined place (a container or the like) and cured. In this way, a large amount of coating ballast can be efficiently obtained, and a plant or the like can be installed to mass-produce the coating ballast.

[0046]

EXAMPLES Preferred examples of the present invention will be described below together with comparative examples. [Example 1] First, andesite was pulverized with a crusher,
A total of 10 kg of a plurality of ballast base materials conforming to the particle size distribution already shown in Table 1 were prepared. Next, the prepared ballast base material is mixed with a rotary drum mixer (Mixta Kogyo Co., Ltd., M
CP-011 type mixer), and put the mixer at 60r.
While rotating at a rotation speed of pm, 0.12 kg of a one-liquid solvent type polyurethane resin primer (Primer B) was charged, and Primer B was applied to the surface of the ballast base material. still,
Primer B is a mixture of polyurethane resin and xylol 40:
It was blended at a weight ratio of 60. Thereafter, the ballast coated with the primer B was transferred to another container, and the primer B was sufficiently cured for about one day.

After the primer B was cured and ready for coating, the ballast coated with the primer B was put into the rotary drum mixer again. And add 60 mixers
While rotating at a rotation speed of rpm, the coating material (2
Liquid polyurethane-based coating material: 0.5 kg of Nippon Sika Co., Ltd., KW-5) was charged, the coating material was applied, and the entire ballast surface was covered with the coating material to obtain an applied ballast.

After the coated ballast was obtained, a pre-curing time of about 15 minutes was provided, and during this time, the coating material was initially cured while rotating the drum. Separately, 20 kg of the curing slurry was previously placed in a curing tank having a volume of 0.1 m ³ (poly container: dimensions 650 × 440 × 350 mm).
I prepared it. In addition, the curing slurry was obtained by blending with the composition shown in Table 2 below.

[0049]

[Table 2]

The curing slurry thus mixed had a viscosity of 15 Pa · s and a density of 1.4 kg / l. In addition, bentonite was used as a thickener to secure the viscosity of the curing slurry to a desired value, and silica stone powder was used to secure the density of the curing slurry to a desired value.

After the lapse of the pre-cure time, the applied ballast in which the coating material was initially cured was put into the curing tank and immersed in the curing slurry. And
The coating material was cured for about one day while floating in the curing slurry. After curing of the coating material, the coating ballast was taken out of the curing tank, and the coating ballast was washed with water to completely remove the curing slurry adhering to the surface. After the washing, the coating ballast was dried to complete the ballast coating process.

With respect to the coating ballast obtained by the above method, the thickness of the coating material was measured.
The average film thickness was 0.51 mm. In addition, no burr was observed on the surface of the coating ballast in appearance. In addition, FIG. 1 shows a schematic flow of the coating processing steps of the present example, Example 2 and Comparative Example 1 described later.

Example 2 First, a coated ballast was obtained in the same manner as in Example 1. Separately, 30 kg of silica sand having a particle size of 150 (JIS G 5901) (manufactured by Tohoku Quartz Sand Co., Ltd., Tohoku Quartz Sand No. 8) has a capacity of 0.14 kg.
An m ³ curing tank (dimensions 650 × 980 × 220 mm) was prepared. After obtaining the applied ballast, the applied ballast was put into a curing tank containing silica sand, and the entire surface of the applied ballast was sprinkled with silica sand to adhere. As a result, the coating material on the surface of the applied ballast is almost completely covered with silica sand, and the dripping of the uncured coating material is prevented. Therefore, the precuring time as in the case of Example 1 is not provided. Was. Until the entire surface of the applied ballast was covered with silica sand, care was taken to prevent the applied ballasts from coming into contact with each other.

After the entire surface of the applied ballast was covered with silica sand, it was cured for about one day. After curing, the coating ballast and excess silica sand were sieved to complete the coating process. The average thickness of the coating ballast obtained by the above method was 1.03 mm as a result of measuring the thickness of the coating material. Although the film thickness was about twice as large as that of the first embodiment,
This is considered to be an effect of silica sand adhering to the surface of the coating ballast, because the curing is performed by the granular material. The effect of the increased film thickness as compared with Example 1 on the prevention of ballast refinement, which is the original purpose of coating, will be verified by the Los Angeles test results described later. In addition, the appearance of the coating ballast was covered with silica sand and the coating material was not visible. Also, no burrs were found on the coating ballast surface.

Comparative Example 1 First, in the same manner as in Example 1, a coated ballast was obtained. Separately, a corrugated sheet for curing the applied ballast was prepared. As shown in FIG. 2, the plate surface was formed in a wave shape, and this corrugated plate 21 was used in order to reduce the contact area between the applied ballast and the plate surface. The actual area of the corrugated sheet 21 (the area when viewed from directly above) is 0.59 m ² (dimension 6
50 × 910 mm).

When the coated ballast, which has been initially cured, is placed on the corrugated plate 21 and cured, the coating ballast and the corrugated plate 21 adhere to each other, and after curing, it becomes difficult to remove the coating ballast. On the surface of the corrugated plate 21, a brushing agent (Linley oil-based wax made by Rinley Co., Ltd.) was applied in an amount of 0.05 kg per 1 m ² .

After obtaining the applied ballast, a pre-curing time of about 15 minutes was provided as in Example 1, and the applied coating material was initially cured in a rotating drum. After the completion of the pre-cure time, a ballast was placed on the corrugated plate 21 and cured until the coating material was cured. After curing, the coating ballast was peeled off from the corrugated plate 21 to complete the coating process.

With respect to the coating ballast obtained by the above method, the thickness of the coating material was measured.
The average film thickness was 0.49 mm, which was almost the same as that in Example 1. Also, no burrs were found on the coating ballast surface. [Comparative Example 2] In addition to the above three types of coating ballasts (Examples 1 and 2 and Comparative Example 1), no coating was applied in order to compare these ballasts with a ballast in a Los Angeles test described below. A ballast preform was prepared as Comparative Example 2. That is, a ballast preform was obtained in the same manner as in Example 1, and was used as Comparative Example 2 as it was.

[Los Angeles Test] The coating ballasts of Examples 1 and 2 and Comparative Examples 1 and 2 obtained by the above method were subjected to a Los Angeles test in order to verify the abrasion resistance performance. The test method is based on JIS A 1121
(Method for testing abrasion of coarse aggregate by Los Angeles tester), and F was applied for particle size classification.

FIG. 3 shows the results of the Los Angeles test.
It shows abrasion and weight loss. The abrasion loss quantitatively indicates the ratio of the abrasion loss by the test to the mass of the sample before the test (here, each of the coating ballasts). From FIG. 3, it can be seen that the ballast coated has a very small amount of abrasion and loss compared to the uncoated ballast (Comparative Example 2). In addition, there was hardly any difference in the abrasion resistance performance due to the difference in the curing method of the coating material, and it was verified that any of the curing methods had a large effect of reducing the grain size.
In addition, as described above, the coating ballast of Example 2 had about twice the thickness of the coating material as compared with the other examples. However, according to the results of this test, the film thickness increased due to the adhesion of silica sand. It was verified that no influence was exerted on the wear resistance performance.

Incidentally, the abrasion resistance performance of Comparative Example 1 was as shown in Example 1,
Although the results were almost the same as the abrasion resistance of Comparative Example 2, the effect of Example 1 was that the space required for curing could be greatly reduced because it could be cured three-dimensionally in the curing slurry as compared with Comparative Example 1. There is. Further, Example 2 is different from Comparative Example 1 in that
In addition to being able to reduce the curing space, the coating material is covered with silica sand, which has the effect of greatly reducing deterioration of the coating material due to ultraviolet rays or the like.

[Examples 3 and 4] Two types of coating ballasts (Examples 3 and 4) were prepared as shown below in order to confirm the effectiveness of the primer treatment in the coating material adhesion strength measurement described later.

First, a ballast preform was prepared in the same manner as in Example 1. And from the prepared ballast base material,
Particles having a particle size such that a flat area of 33 mm square for mounting a measuring device at the time of measuring the adhesive strength of the coating material were selected. Since this 33 mm square area needs to be flat in order to mount the measuring instrument, a flat area is formed on the surface of the ballast base material by smoothing a part of the surface of the selected ballast base material. did. The steps up to this point are the same in Examples 3 and 4.

Next, in the third embodiment, after preparing the ballast base material as described above, the coating ballast is coated by the same coating method as in the first embodiment (all the processing steps after the application of the primer). Obtained. However, at this time, the amount of the prepared ballast base material (that is, the ballast base material put into the rotary drum type mixer) was 2 kg, the amount of the primer B used was 0.06 kg, and the amount of the coating material used was 0.1 kg. there were.

On the other hand, in Example 4, after preparing the above-mentioned ballast preform, the coating material was directly applied to the surface of the ballast preform without applying the primer. That is, in the coating method of Example 3, except that the primer treatment (primer application and curing) is not performed,
A coating ballast was obtained.

[Measurement of Adhesive Strength of Coating Material] In order to confirm the effectiveness of the primer treatment in the coating method of the present invention, the adhesive strength of the coating material was measured for the coating ballasts of Examples 3 and 4 described above.

In the measurement of the adhesive strength, the force required for peeling the 33 mm square coating film from the coating ballasts of Examples 3 and 4 was measured using a simple type tensile tester manufactured by Suncoatect Co., Ltd. FIG. 4 shows the measurement results.
From FIG. 4, it can be seen that Example 3 has a sufficiently large adhesive force as compared to Example 4 not subjected to the primer treatment. Further, in addition to the primer B used in Example 3 above,
Primers having the compositions shown in Table 3 below (Primer E, Primer E
The adhesion was measured by C) and the Los Angeles test was performed. The result was that the adhesion was almost the same as that of Example 3 and the same abrasion resistance as that of Example 3 using any of the primers. was gotten.

[0068]

[Table 3]

In Example 4, the adhesion of the coating material was low because the primer treatment was not performed. However, since the coating treatment was performed, the uncoated ballast base material itself (that is, the above-described comparative example) was used. It is expected to have better wear resistance than Example 2). This verified the effectiveness of applying the primer before applying the coating material.

[Brief description of the drawings]

FIG. 1 is a schematic flowchart showing a ballast coating process.

FIG. 2 is a perspective view of a corrugated sheet used in Comparative Example 1.

FIG. 3 is an explanatory diagram showing the results of the Los Angeles test.

FIG. 4 is an explanatory view showing a result of an adhesive force measurement.

FIG. 5 is a cross-sectional view of a conventional ballast ballast track.

FIG. 6 is a perspective view schematically showing a coating material and a ballast in a conventional coating method.

[Explanation of symbols]

 Reference numeral 21: corrugated sheet 51: ballast track track 52: track bed 53, 61: ballast 54: sleepers, 55: rail 56: roadbed, 62: basket 63 ...・ Container, 64 ・ ・ ・ Coating material

Continuation of the front page (56) References JP-A-9-241084 (JP, A) JP-A-3-141175 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C04B 41 / 52 E01B 1/00

Claims (7)

(57) [Claims] 1. A method for obtaining a coating ballast having the entire surface coated with the wear-resistant material by applying a wear-resistant material to the surface of a ballast base material and curing the applied wear-resistant material. The applied ballast obtained by applying the abrasion resistant material to the surface of the ballast base material, at least water, a surfactant, and an inorganic material for maintaining the same density as the applied ballast. A method for coating a ballast, wherein the applied ballast is immersed and floated in a curing slurry containing mineral particles as a component to cure the wear-resistant material in the curing slurry. 2. A pre-curing time of 5 to 30 minutes is provided before immersing the applied ballast in the curing slurry to initially cure the wear-resistant material on the surface of the applied ballast. The ballast coating method according to claim 1, wherein 3. The ballast coating method according to claim 1, wherein the curing slurry has a viscosity of 10 to 100 Pa · s by including a thickener as a component. 4. The ballast coating method according to claim 1, wherein the amount of the surfactant is 1 to 5% by weight. 5. A method of applying a wear-resistant material to the surface of a ballast base material and curing the applied wear-resistant material to obtain a coating ballast having the entire surface coated with the wear-resistant material. The applied ballast obtained by applying the abrasion-resistant material to the surface of the ballast base material is thrown into a container containing powder and granules.
Ballast in the container, and
A method of coating a ballast, wherein the ballast is coated with the powder and the whole surface of the applied ballast is covered with the powder to cure the wear-resistant material. 6. The ballast coating method according to claim 5, wherein the granular material is silica sand having a particle size of 150 or more. 7. Applying a primer to a surface of the ballast base material before applying the wear-resistant material to the ballast, in order to improve an adhesion of the wear-resistant material to the ballast. The ballast coating method according to any one of claims 1 to 6, wherein: