JPH07292603A - Artificial ballast - Google Patents

Abstract

PURPOSE:To reduce the deformation of a truck road, by coating a core material like stag, iron lump with a polymer to make almost the same specific gravity with crushed ballast as a whole and mixing the artificial ballast with ordinary crushed stones to increase the adhesiveness and friction. CONSTITUTION:A core material made of slag or iron lump, having a larger specific gravity than crushed ballast fixing railway sleepers is coated with a polymer by immersion into a liquid polymer or other ways so as to provide almost the same specific gravity width the crushed ballast as a whole. This artificial ballast is mixed as replenishing ballast at the maintenance work of the truck way and compacted and evenly scattered in the conventional ballast. And the adhesive function, the frictional function and the vibration-absorbing function are improved at the contact parts with the existing crushed stones. And also vibration, while a train passes through, is absorbed and the whole crushed stones are made stable without mutual moving friction, by this vibration. In this way, the subsidence deformation of the ballast due to the traveling of trains can be lessened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crushed stone slab that contributes to labor-saving structure of railway tracks.

[0002]

2. Description of the Related Art Conventional crushed stones are composed of crushed stones alone, and as a set, they form a railroad track bed. Whenever a train runs, the roadbed sinks and deforms due to wear movement of the contacted crushed stones. For this reason, the same single crushed stone is replenished and compacted by a tamper or the like.

[0003]

In the conventional railway track,
It is unavoidable to repeat the subsidence deformation of the roadbed and the repair work as described above, and the procurement of personnel for this work and the huge cost have been a pressure factor for railway management. To solve this problem, a labor-saving track (for example, a slab track) that does not have a part that sinks and deforms when the train runs, such as a roadbed.
Was developed, but it was profitable only when a new track was constructed. That is, there are some proposals for a method of making an existing trackbed track structure that does not sink and deform due to train running, but it has not yet been realized profitably.

The present invention has been proposed in view of the above-mentioned problems of the prior art. The object of the present invention is to improve the conventional track structure without special improvement work.
The purpose of the present invention is to provide a supplementary artificial crushed stone for realizing a labor-saving track structure that is less likely to sink and deform due to train running when the train passes or is compacted by a tamper that has been usually performed.

[0005]

In order to achieve the above object, the artificial crushed stone of the present invention according to the present invention has a core made of a material having a higher specific gravity than the crushed stone of the roadbed and a smaller specific gravity than the crushed stone of the roadbed covering the core. It is characterized by comprising two layers of inner and outer layers of material, and by adjusting the specific gravity and volume of each of the inner and outer layers, it has the same specific gravity as the crushed bed as a whole.

Further, the present invention is characterized in that the outer layer material of the crushed stone has the characteristics of improving the adhesion performance, friction performance and vibration absorption performance between the crushed stone and the conventional crushed stone at the contact portion. . Furthermore, the present invention is characterized in that the ordinary crushed stone for a roadbed is covered with a thin outer layer material if it falls within the range of the variation in the specific gravity of the crushed stone for a usual roadbed.

[0007]

[Operation] As described above, the artificial stone crushed stone according to the present invention is
Since it realizes a labor-saving track structure that is unlikely to be deformed by subsidence due to train running, it must be evenly dispersed and mixed in the conventional roadbed. For this reason, a material with a specific gravity higher than that of the crushed stone is used as the core, and the core is wrapped with a material with a smaller specific gravity than the crushed stone, and is composed of two layers.The specific gravity and volume of each layer are adjusted to form the crushed stone as a whole. By having the same specific gravity, when the conventional roadbed crushed stones are replenished and solidified in maintenance work for the roadbed of the roadbed track, it does not rise or sink due to the difference in specific gravity.

The artificial crushed stone according to the present invention, which is uniformly dispersed and mixed in the conventional roadbed, has an outer layer material which improves the adhesion performance, the friction performance and the vibration absorption performance at the contact portion with the conventional roadbed crushed stone. As a result, it is possible to prevent wear and movement at the contact portion between the two crushed stones due to load and vibration when the train is running, and it is possible to realize a labor-saving track structure in which subsidence deformation of the roadbed is difficult.

[0009]

EXAMPLES The present invention will be described below with reference to examples. Dip a core material, such as steel slag, iron ingot, etc., that has a greater specific gravity than crushed stone in the bed, into the liquefied polymer material, fit the core material in a bag of rubber-like polymer material, or add the polymer material to the columnar core material By covering it and cutting it, etc., a core made of a material having a larger specific gravity than the artificial crushed stone, and covering the same core, and composed of two layers of inner and outer materials made of a material having a smaller specific gravity than the crushed stone, Moreover, by adjusting the specific gravity and volume of each of the inner and outer layers, an artificial crushed stone having a specific gravity equivalent to that of the crushed stone is constructed as a whole.

Thus, in the maintenance work for the track of the trackbed, if the artificial ballast crushed stone is mixed as a supplementary ballast with the conventional ballast crushed stone and compacted, the artificial ballast crushed stone is in the conventional roadbed. It is evenly dispersed and mixed in the crushed stone, and the adhesion performance, the friction performance, and the vibration absorption performance that is propagated when passing the train are improved at the contact portion between the artificial crushed stone and the conventional crushed stone. Furthermore, by repeating the work of compacting it or repeating the loading and vibration as the train travels, the entire crushed stone of the roadbed is kept in a stable state without mutual wear, and a labor-saving track that is unlikely to sink and deform due to train travel. The structure can be configured.

When it is effective to mix another component material for further improving the adhesion performance, friction performance, etc. between the artificial crushed stone and the conventional crushed stone during the refilling and compaction work of the crushed artificial stone There is also. Although it takes a certain amount of time to realize this labor-saving track structure, it does not become expensive as it does not require a special improvement work process other than the usual road compaction work.

[0012] However, as the connections between the crushed stones of the roadbed become stronger and the roadbed becomes less deformable, it takes more labor to repair the deviation of the orbit. The total cost will not increase even if the cost of repair work is increased. By selecting, for example, a thermoplastic resin as the material for the outer layer material of the artificial roadbed crushed stone,
The blade can be compacted with a tamper and the heat treatment such as blowing hot air just before the work can soften the outer layer material at the contact area between the artificial crushed stone and the conventional crushed stone to facilitate compaction work. . Also, if there is a suitable chemical solvent that softens the outer layer material, the spattering thereof also produces the same effect. Further, by such softening treatment, it is possible to realize a roadbed structure which is more stable against deformation after the work.

Next, specific examples of the present invention will be described. [Example 1] In order to obtain a stable roadbed, the outer layer polymer material of the newly added artificial crushed stone was aged by train load, especially vibration load, without any special work other than supplemental compaction. Examples of the polymer material that is bonded to crushed stone or artificial crushed stone to construct a stabilized ballast include rubber asphalt, tar urethane, rubber-modified urethane, tar epoxy, and vinylisoprene-bonded elastic thermoplastic polymer. [Example 2] When artificial crushed stones are added, it may be effective to mix an adhesive component necessary for constructing a stabilized trackbed with age by the method shown in Example 1 above.

The adhesive component is contained in hollow beads of polyvinylidene chloride, polyvinyl chloride, polystyrene or the like, and adheres old crushed stones or artificial crushed stones with a train load, especially a vibration load, over the years. The outer layer polymer material of the artificial crushed stone in this case is polyester,
Examples thereof include thermosetting resin simple substances such as epoxy, polyacrylonitrile, and epoxy acrylate, and resin mortar obtained by adding short fiber glass fiber or inorganic filler to them. [Example 3] By further performing special work such as heating, forced high-frequency vibration, or using an effective solvent to facilitate compaction work of the roadbed during stabilization, the roadbed is further stabilized. Examples of the artificial crushed stone outer layer material include polystyrene, polypropylene, polyvinyl chloride, and copolymers thereof.

In this case, as a heating method, a blade of a tie tamper is heated at the time of compaction, or high temperature air is blown into a necessary portion of the crushed stone of the bed. Alternatively, necessary high frequency vibration is applied so that the outer layer polymer material is melt-bonded by frictional heat. Alternatively, a method of injecting a solvent such as toluol, styrene, or the like into a necessary portion of the outer layer polymer material, or sprinkling it at the time of compaction can be considered.

[0016]

As described above, the present invention comprises a core having a larger specific gravity than a crushed stone of a roadbed and an outer layer material having a smaller specific gravity than the crushed stone, and the specific gravity and volume of each inner and outer layer are adjusted. As a result, an artificial ballast crushed stone having a specific gravity equivalent to that of the conventional roadbed crushed stone is constructed as a whole, and by mixing this into the existing railroad track bed, it is used for normal roadbed compaction work and train running. A load-saving track with improved adhesion performance, friction performance, and vibration absorption performance between crushed stones will be realized due to vibrations caused by loading.

Claims (3)

[Claims] 1. A core made of a material having a specific gravity higher than that of the crushed stone of the roadbed, and a core material made of a material having a smaller specific gravity than the crushed stone of the roadbed covering the core. The specific gravity and volume of each of the inside and outside layers are different. The artificial crushed stone having a specific gravity equivalent to that of the crushed stone as a whole by being adjusted. 2. The artificial stone crushed stone according to claim 1, wherein the stone crushed stone which is usually used is thinly covered with an outer layer material and falls within the range of variations in the specific gravity of the stone crushed stone. 3. When the artificial roadbed crushed stones are mixed into the roadbed of an existing railway track, they are compacted by a train load or a tamper, so that the outer layer material of the artificial roadbed crushed stones and the conventional roadbed crushed stones are contacted with each other. The crushed artificial bed stone according to claim 1, which is covered with an outer layer material configured to improve adhesive performance, friction performance, and vibration absorption performance and realize a labor-saving track that is less likely to be deformed by running a train.