JP5914034B2 - Method for producing crushed stone aggregate block, and method for producing crushed stone aggregate block group - Google Patents

Description

The present invention relates to a method for producing a crushed stone aggregate block in which crushed stone bodies are joined together.

  For example, a ballast track, which is one of the roadbed tracks, is a railroad with a sleeper placed on a roadbed (ballast track) covered with a single-grained crushed stone produced by crushing natural stone called "ballast (ballast ballast)". Orbit with a structure that supports It is empirically known that the ballast track is superior in low vibration, low noise, and drainage compared to a slab track formed with concrete or the like.

  However, since ballast is deteriorated and subsided over time, it is said that it takes time to perform maintenance such as replenishment, replacement, and compaction of ballast on the ballast track. In addition, there are also problems such as so-called `` stepping stones '' where ice blocks attached to railway vehicles fall off and hit the ballast and scatter around it, and by spraying adhesive on the ballast on the surface layer and solidifying it, etc. (See Patent Document 1).

JP-A-9-31432

  As described above, the ballast track is superior to the slab track in many respects such as low vibration and noise, but is inferior in terms of installation man-hours and maintainability compared to the slab track.

  The present invention has been made in view of these problems, and an object of the present invention is to propose a method for realizing a ballast track that is easier to install and maintain while maintaining the advantages of the ballast track. Furthermore, it aims at making the merit of a ballast track possible other than track construction.

  A first form for solving the above problems is that a plurality of crushed stone bodies are joined by point contact, and the joint has a hardness equal to or higher than the hardness of the crushed stone body, and is integrally molded into a predetermined shape as a whole. It is a crushed stone aggregate block.

The “crushed stone” as used herein refers to an object having a plurality of ridge corners and protrusions capable of making point contact with a roadbed ballast or an adjacent crushed stone.
According to the first embodiment, the same structure as the structure of the ballast aggregate in the ballast track is provided, and the low vibration and low noise effect similar to that of the ballast track can be obtained. Low vibration and low noise can be realized by constructing a ballast track by a simple construction in which the block is spread, or by arranging the block at a desired place in addition to the track.

  A 2nd form is a crush body aggregate block of the 1st form characterized in that the space between the crushed bodies is a void without a filler other than the joint.

  According to the 2nd form, while being able to acquire the same effect as a 1st form, various merits by having gaps, such as the high drainage nature similar to a ballast track, are also acquired.

  A 3rd form is the crushed stone aggregate block of the 1st or 2nd form characterized by the thickness of the thinnest part being 12 cm or more.

  According to the 3rd form, while the same effect as the 1st or 2nd form is acquired, the stress transmitted to a roadbed can be controlled effectively, and the performance of low vibration and low noise can be improved ( For example, see FIG.

  A fourth form is the crushed stone aggregate block according to any one of the first to third aspects, wherein the crushed stone is an artificial polyhedron formed in a crushed stone shape having ridges or protrusions. .

  According to the 4th form, it can respond to the depletion of the natural stone which can be utilized as a crushed stone body. In addition, if attention is paid to the attenuation characteristics of the process in which the wave propagated to the crushed stone diffuses and reflects inside, the crushed stone derived from natural stone has the attenuation characteristics. However, in the case of an artificial polyhedron, the attenuation characteristics can be controlled by its shape and material design. In addition, crushed stones with the same attenuation characteristics can be mass-produced, so there is room to give intentional characteristics to the attenuation characteristics as a block by designing the type, number, location, etc. of crushed stones contained in the block. to be born. For example, it is possible to increase the attenuation of vibration at a specific frequency. Moreover, it can be realized lighter than natural stone.

  The fifth form is the crushed stone aggregate block according to any one of the first to fourth aspects, wherein the joining is performed by welding the crushed stone.

  According to the 5th form, while the effect similar to any of the 1st-4th form is acquired, the junction structure by a point contact can be implement | achieved more firmly. That is, it is possible to more effectively suppress the wear and tear of the joint portion and to maintain the low vibration / low noise effect for a long time.

  A sixth embodiment is the crushed stone aggregate block according to the fifth embodiment, wherein the crushed stone has a metal layer on the surface, and the joining is performed by welding the metal layer.

  According to the sixth embodiment, for example, even if the crushed stone body itself does not melt or is a material that is extremely difficult to melt, the same effect as the fifth embodiment can be obtained.

  A seventh aspect is the crushed stone aggregate block according to the fourth aspect, wherein the crushed stone includes a solid body made of concrete, metal, ceramic, or high-strength synthetic resin.

  According to the seventh embodiment, the same effect as that of the fourth embodiment can be obtained, and mass production technology, particularly mass production technology using a mold has been established for these materials, and the merits thereof can be enjoyed.

  The eighth form is the crushed stone aggregate block according to any one of the first to seventh aspects, and the crushed stone aggregate configured by combining a plurality of types of crushed stone aggregate blocks composed of crushed stones of different sizes. Block group.

  According to the eighth embodiment, the same effect as any one of the first to seventh embodiments can be obtained, and the blocks having different vibration damping characteristics due to the difference in the size of the crushed stone constituting each can be appropriately combined to form each of the blocks. A variety of low-vibration and low-noise performances that cannot be achieved with blocks alone can be realized.

The strain distribution figure in the primary vibration mode by the eigenvalue analysis of the ballast aggregate | assembly using a DEM polyhedron model. The figure which shows the input conditions of the wave propagation analysis using a FEM polyhedron model. Von Mises stress distribution map in wave propagation analysis using FEM polyhedron model. The graph which shows the change of the von Mises stress in the crushed stone contact point just under a load point in the wave propagation analysis using a FEM polyhedron model. The perspective external view which shows an example of a crushed stone aggregate block. The figure which shows the example of a crushed stone body. The conceptual diagram for demonstrating a 1st manufacturing method. The enlarged view of the junction part of the crushed stone body in a 1st manufacturing method. The conceptual diagram for demonstrating the 2nd manufacturing method. The enlarged view of the junction part of the crushed stone body in a 2nd manufacturing method. The conceptual diagram for demonstrating the 3rd manufacturing method. The enlarged view of the junction part of the crushed stone body in a 3rd manufacturing method. The conceptual diagram for demonstrating the 4th manufacturing method. The enlarged view of the junction part of the crushed stone body in a 4th manufacturing method. The conceptual diagram for demonstrating the 5th manufacturing method. The enlarged view of the junction part of the crushed stone body in a 5th manufacturing method. It is a figure which shows the utilization example at the time of using a crushed stone aggregate block for a railway track, (1) The longitudinal cross-sectional view orthogonal to a track direction, (2) Side sectional view of a track. The figure which shows the example of the crushed stone aggregate block which prepared the particle size of the crushed stone body to comprise suitably. (1) The figure which shows the example of the crushed stone aggregate block which gave the local bias in the size of the crushed stone. (2) The figure which shows the example of the crushed stone aggregate block group comprised by combining the multiple types of crushed stone aggregate block comprised with the crushed stone bodies of different sizes.

[1. Explanation of research results]
Although the mechanism by which the ballast track is superior in terms of low vibration and noise compared to the slab track has not been elucidated for a long time, the numerical analysis based on the measured three-dimensional shape of the ballast revealed that the ballast track contacted by the polyhedron It turned out that the structure itself realized low vibration and low noise.

  Specifically, a DEM (Discrete Element Method) polyhedron model is created based on the actual ballast measured by a 3D digitizer, and the physical properties are the same as those of the actual ballast, and the constraints are compacted within a predetermined frame. The simulation by the individual element method was performed under the conditions. Then, from the simulation results, the arrangement information and contact point information of the polyhedron model as the ballast aggregate are extracted, and this is replaced with the finite element method model to analyze the eigenvalue of the ballast aggregate and the transient response to the train running load. Analysis and wave propagation analysis were performed.

  FIG. 1 is a strain distribution diagram (cross section) in a primary vibration mode (vertical elastic vibration mode) by eigenvalue analysis. As a result of the eigenvalue analysis, it was found that only a few of the many ridge angles of the ballast are locally deformed to act as a spring, and the other part vibrates as a rigid body. In the example shown in the figure, high distortion occurs at the corners surrounded by white circles. In the transient response analysis, the load measurement waveform measured on the lower surface of the actual sleeper was set near the center of the finite element method model, and the analysis was performed. Thus, the effectiveness of the finite element method model in vibration analysis was confirmed.

  In the wave propagation analysis, as shown in FIG. 2, a shock wave was input to the center of each upper surface of the finite element method model corresponding to the intact rock block and the ballast aggregate and compared. FIG. 3 is a von Mises stress distribution diagram showing the results of wave propagation analysis in which shock waves are input to the intact rock mass and the finite element method model. FIG. 4 is a graph showing changes in von Mises stress at the crushed stone contact point directly under the load point in wave propagation analysis.

As shown in FIG. 3 (1), in an intact rock mass, the shock wave traveled while diffusing and reached the lower end of the model after 47 μs (microseconds).
On the other hand, in a finite element method model, that is, a ballast assembly, (a) the impact travels at the same speed as the intact rock mass inside the vibrated ballast, but (b) most waves stay inside the ballast and diffuse and reflect. Is consumed repeatedly. (C) A part of the wave that reaches the point of contact with the other ballast is propagated to the other ballast adjacent through the point of contact, and (d) the wave remains in the ballast in the same manner in the other crushed stone of the propagation destination. It is consumed by repeated diffusion and reflection, and (e) is propagated along a complicated path such as being transmitted to another adjacent ballast. Therefore, for example, as shown in FIG. 3 (2), even when 60 μs has elapsed, the tip of the shock wave has reached the center of the model, but a strong wave still remains in the upper ballast while repeating diffusion and reflection. Yes.

  As a result, as shown in FIG. 4, in the ballast assembly, as the distance from the load point increases, the response rise is delayed and becomes gentle, the stress value is also attenuated, and the waveform becomes smooth. In other words, it can be said that the ballast aggregate is excellent in low vibration and low noise because the wave propagation speed is reduced and the wave is greatly attenuated compared with concrete or a single bedrock.

[2. Description of Embodiment]
Next, an embodiment of the present invention based on the knowledge obtained from the above research results will be described.
FIG. 5 is a perspective external view showing an example of a crushed stone aggregate block to which the present invention is applied.
The crushed stone aggregate block 2 is a block in which a plurality of crushed stone bodies 4 are joined by point contact, the joint has a hardness equal to or higher than the hardness of the crushed stone body 4, and is integrally molded into a predetermined shape as a whole. It is also a porous body in which voids exist between the crushed stone bodies 4. In the example of the figure, a rectangular parallelepiped shape is formed, but the shape and dimensions of the crushed stone aggregate block 2, the size and number of the crushed stone bodies 4 to be configured, and the like can be appropriately set according to the application.

  FIG. 6 is a diagram illustrating an example of the crushed stone body 4. The crushed stone body 4 includes (1) a roadbed ballast 4a made by seeding or crushing natural stone or concrete, (2) ceramics, concrete, metal, hard resin, hard glass, quartz, fiber reinforced plastic, etc. Artificial ballast 4b molded from a hard material, (3) Polyhedron 4c molded from a hard material so as to have ridge corners and projections that are considered to easily cause point contact, (4) Ridge corners and projections It can be set as the lattice structure 4d provided with a portion. The crushed stone body 4 constituting one crushed stone aggregate block 2 may be one kind of these, or a plurality of kinds may be mixed.

  The artificial ballast 4b may be manufactured by crushing a hard material body, or may be manufactured by appropriately using mass production techniques suitable for the material such as casting, forging, molding, and firing. The material may be ceramics, concrete, metal, hard resin, glass, quartz, fiber reinforced plastic, or the like, but may be appropriately selected so as to obtain mechanical characteristics according to the use of the crushed stone aggregate block 2. The shape is a shape having appropriate ridges and protrusions so as to easily cause point contact with the adjacent crushed stone body 4 while being appropriately simplified so as to be suitable for mold manufacture with reference to the roadbed ballast 4a. Although it is basically solid, it may be a porous body partially provided with bubbles or voids.

  The polyhedron 4c is a polyhedron having a ridge corner as a base shape. Furthermore, as shown in the figure, the surface may have a shape having a protrusion. Moreover, the shape used as a base is not limited to a polyhedron, and may be a shape having a ridge corner or a protrusion partly in a shape formed with a generally curved surface such as river gravel.

  The lattice structure 4d is a three-dimensional structure formed of a lattice that also serves as a ridge corner. It is possible to image a wireframe model in 3D computer graphics. For example, it is formed of ceramics, concrete, metal, hard resin, glass, quartz, fiber reinforced plastic or the like.

Next, the manufacturing method of the crushed stone aggregate block 2 is demonstrated.
FIG. 7 is a conceptual diagram for explaining the first manufacturing method. The first manufacturing method is suitable when the crushed stone body 4 is a roadbed ballast 4a or an artificial ballast 4b. Specifically, (1) the crushed stone body 4 is filled in a mold 6 having a small hole 7 at least at the bottom [filling step], and (2) the crushed stone body 4 points to each other in the same manner as the ballast set in the ballast orbit. Tamping so as to be in contact [tamping step; point contact forming step].

  Next, (3) the bonding material 8 suitable for the crushed stone 4 is applied evenly over the mold 6 [bonding material addition step]. The bonding material 8 is selected such that the hardness at the time of curing is equal to or higher than the hardness of the crushed stone body 4. For example, an adhesive or cement slurry can be considered. The applied bonding material 8 adheres to the surface of the crushed stone body 4, and the bonding material 8 that hangs down without being adhered is discharged from the small hole 7 to the outside of the mold 6. Then, (4) the bonding material 8 is cured [curing step], (5) after curing, the mold 6 is removed and the crushed stone aggregate block 2 is completed [die cutting step].

  FIG. 8 is an enlarged view of the joint portion of the crushed stone body 4 in the first manufacturing method. At the end of the tamping step, as shown in FIG. 8 (1), the adjacent crushed stone bodies 4 (4e, 4f) are in point contact at the ridge corners and the tips of the protrusions. At this stage, the contact state between the ballasts in the ballast track is reproduced. Then, at the end of the curing step, as shown in FIG. 8 (2), the joint portion 12 that reinforces the point contact portion is formed by the cured layer 10 of the joining material 8, but the large portion between the adjacent crushed stone bodies 4 is formed. The part becomes the gap 14.

  By forming the hardened layer 10 of the bonding material 8, the loose crushed stone body 4 can be handled as an integral block. The hardened layer 10 appropriately suppresses the relative positional deviation between the crushed stone bodies while maintaining the function of acting as a spring by locally deforming while transmitting the load wave to the other crushed stone bodies where the point contact portions are adjacent. The point contact portion can be reinforced. That is, the structure which produces the low vibration and low noise effect of the crushed stone aggregate block 2 can be maintained for a long time.

FIG. 9 is a conceptual diagram for explaining the second manufacturing method. The second manufacturing method is suitable for a metal artificial ballast 4b.
Specifically, (1) The crushed stone body 4 is filled in the mold 6B [filling step]. An electrode 22 is provided on the inner surface of the mold 6B, and the electrode 22 is energized from the power supply unit 26 when the switch 24 is turned on.
Then, (2) the crushed stone body 4 is tamped so as to make a point contact similar to the ballast assembly of the ballast track [a tamping step; a point contact forming step], and (3) the flux material 20 is placed from above the mold 6B. Apply evenly [flux material addition step]. The flux material 20 is appropriately selected according to the material of the crushed stone body 4.
Then, after the flux material 20 is added, (4) the electrode 24 is energized by turning on the switch 24 while applying the load W to the crushed stone body 4. Then, electricity passes through the entire crushed stone body 4 starting from the crushed stone body 4 in contact with the electrode 22, and the surfaces of the adjacent crushed stone bodies 4 are melted and welded [welding step]. (5) After appropriate cooling, the mold 6B is removed and the crushed stone aggregate block 2 is completed [die cutting step].

  FIG. 10 is an enlarged view of the joint portion of the crushed stone body 4 in the second manufacturing method. At the end of the tamping step, as shown in FIG. 10 (1), the adjacent crushed stone bodies 4 (4g, 4h) are in a point contact state at the ridge corners and the tips of the protrusions. At this stage, the contact state between the ballasts in the ballast track is reproduced. At the end of the welding step, the surfaces of the crushed stone bodies 4 are melted and welded as shown in FIG. Most of the space between the adjacent crushed stone bodies 4 is a gap portion 14.

FIG. 11 is a conceptual diagram for explaining the third manufacturing method. The third production method is suitable when the crushed stone body 4 is a material that can be plated.
Specifically, (1) the mold 6C (for example, net type) is filled with the crushed stone body 4 [filling step], and (2) the crushed stone bodies 4 are in point contact with each other as in the ballast set of the ballast track. [A tamping step; a point contact forming step].
Next, (3) the mold 6C is plated together to form a hard film [film forming step]. For the plating, a type that gives a hardness of the crushed stone body 4 or higher is appropriately selected. Here, an example of electroplating in which the mold 6C is immersed in the electrolytic layer 28 is shown. However, as long as the hardness requirement is satisfied, it can be appropriately replaced with electroless plating, vacuum deposition, or other film forming treatment.
Then, after the film is formed, (4) after washing and drying post-treatment [post-treatment step], (5) removing the jig and the mold 6C, and completing the crushed stone aggregate block 2 [die-cutting step ].

  FIG. 12 is an enlarged view of a joint portion of the crushed stone body 4 in the third manufacturing method. At the end of the tamping step, as shown in FIG. 12 (1), the adjacent crushed stone bodies 4 (4j, 4k) are in point contact at the ridge corners and the tips of the protrusions. At this stage, the contact state between the ballasts in the ballast track is reproduced. At the end of the film formation step, as shown in FIG. 12 (2), the joint 12 that reinforces the point contact portion is formed by the hard film layer 30 by plating. The part becomes a gap 14.

FIG. 13 is a conceptual diagram for explaining the fourth manufacturing method. In the fourth production method, a metallized crushed stone body 4M, which is a crushed stone body with a metal film formed on the surface by plating or the like in advance, is used.
Specifically, first, (1) the crushed stone body 4 is subjected to a surface treatment such as plating or vacuum deposition to form a metallized crushed stone body 4M having a metal film having a hardness higher than that of the crushed stone body 4 on the surface [metal. Film formation step].
Next, (2) the metallized crushed stone 4M is filled into the mold 6B [filling step]. An electrode 22 is provided on the inner surface of the mold 6B. When the switch 24 is turned on, the electrode 22 is energized from the power supply unit 26.
Then, (3) while applying a load W to the metallized crushed stone body 4M, the switch 24 is turned on and the electrode 22 is energized. Then, starting from the metallized crushed stone body 4M in contact with the electrode 22, electricity is passed through the entire crushed stone body filled in the mold 6B to generate heat, and the surfaces of the adjacent metallized crushed stone bodies 4M are melted and welded [welding step. ]. (5) After appropriate cooling, the mold 6B is removed and the crushed stone aggregate block 2 is completed [die cutting step].

  FIG. 14 is an enlarged view of a joint portion of the metallized crushed stone body 4M in the fourth manufacturing method. At the end of the tamping step, as shown in FIG. 14 (1), the adjacent metallized crushed stone body 4M is in a point contact state at the ridge corner or the tip of the projection, and at this stage, the contact state between the ballasts on the ballast roadbed is It has been reproduced. However, since the metal film 34 exists in the metallized crushed stone body 4M, point contact is not reached at the level of the crushed stone body (4 (4r, 4p)) under the film. At the end of the welding step, as shown in FIG. 14 (2), as the metal film 34 melts, the ridge corners and the tips of the protrusions break through the film and come into contact with each other, and the crushed stone bodies themselves have point contact parts. It will be in the state. The melted metal film 34 is re-cured on the surface of the main body with cooling to reconstruct a film covering the point contact. Therefore, the joining part 12 which coat | covers and reinforces the site | part where the main bodies of the metallized crushed stone bodies 4M contacted each other is formed. Note that most of the space between the adjacent metallized crushed stone bodies 4 </ b> M is a gap 14.

FIG. 15 is a conceptual diagram for explaining the fifth manufacturing method. The fifth production method is suitable for the synthetic resin crushed stone body 4 which can be remelted and welded by heating.
Specifically, (1) the heat-resistant mold 6E is filled with the crushed stone body 4 [filling step], and (2) the crushed stone body 4 is pushed so as to make point contact with each other in the same manner as the ballast set of the ballast track. Solidify [tamping step; point contact forming step]. Next, (3) the entire mold 6E is heated in a furnace or the like while applying a load W to the crushed stone body 4. Then, the surfaces of the adjacent crushed stone bodies 4 are melted and welded [welding step]. (4) After appropriate cooling, the mold 6E is removed and the crushed stone aggregate block 2 is completed [die cutting step].

  FIG. 16 is an enlarged view of the joint portion of the crushed stone body 4 in the fifth manufacturing method. At the end of the tamping step, as shown in FIG. 16A, the adjacent crushed stone bodies 4 (4s, 4t) are in a point contact state at the ridge corners and the tips of the protrusions. At this stage, the contact state between the ballasts in the ballast track is reproduced. At the end of the welding step, the surfaces of the crushed stone bodies 4 are melted and welded as shown in FIG. Most of the space between the adjacent crushed stone bodies 4 is a gap portion 14.

FIG. 17 is a diagram showing an example of use when the crushed stone aggregate block 2 is used in a railroad track, (1) a longitudinal sectional view orthogonal to the track direction, and (2) a side sectional view of the track.
The crushed stone aggregate block 2 in this example is a rectangular block that is long in the direction orthogonal to the rail 40 (the direction of sleepers), and is provided with a recess 3 that can accommodate and fix the sleepers 42 at the top, and a plurality of blocks are provided in the track direction. Arrange to form the bed. The thinnest part thickness from the recess 3 to the lower surface of the block 2 is preferably 12 cm or more based on the knowledge shown in FIG. Also. Although not shown in the drawings, it is preferable to appropriately provide a structure in which concave and convex fitting is performed between adjacent blocks and a structure for fixing the blocks to the roadbed 44 and suppressing displacement. The installation of the roadbed only requires the arrangement of the crushed stone aggregate blocks 2, and there is a convenience that is not defeated in constructing a concrete slab roadbed. Nevertheless, the same low vibration and low noise as the conventional ballast roadbed can be realized. In addition, since the ballast is joined, it is not necessary to take measures such as separately spraying an adhesive to prevent stepping stones.

  As mentioned above, although the embodiment of the crushed stone aggregate block 2 to which the present invention is applied has been described, the embodiment of the present invention is not limited to these, and additions, omissions, and changes of components can be appropriately made. .

  For example, the use form of the crushed stone aggregate block 2 is not limited to the roadbed of a railroad track, but can also be used to construct a soundproof wall, road pavement, stairs and the like.

  For example, like the crushed stone aggregate blocks 2B, 2C, and 2D shown in FIG. On the other hand, it is possible to make a block that is particularly excellent in low vibration and low noise. The more crushed stone bodies 4 are finer, the more excellent the attenuation to high frequency components is, and the larger the ratio of crushed stone bodies 4 having larger grains, the more excellent the attenuation to low frequency components.

  Moreover, the size of the crushed stone body 4 constituting one crushed stone aggregate block 2 can be locally biased. For example, in the crushed stone aggregate block 2E for railroad tracks shown in FIG. 19 (1), the specially blended portion 46 in which the constituent ratio of the crushed stone of a specific size is higher than the other portion is provided immediately below the rail 40. For example, the crushed stone bodies 4 having a size and shape having a high attenuation rate with respect to a specific frequency are intensively arranged in the portion, so that the low vibration and low characteristic are lower than when the crushed stone bodies 4 are integrated without being intensively arranged. Noise characteristics can be demonstrated. The same thing can be realized with a crushed stone aggregate block group 2F as shown in FIG. That is, it can be realized by a block group configured by combining a plurality of types of crushed stone aggregate blocks 2g, 2h, 2j composed of crushed stone bodies of different sizes.

  In addition, other structural members other than the crushed stone body 4 can be appropriately added to the constituent elements of the crushed stone aggregate block 2. For example, a structure containing a rod-like body that is longer and larger than the crushed stone body 4 excellent in shock wave attenuation along the longitudinal direction of the crushed stone aggregate block 2 for railroad tracks, like the backbone or central axis of the block. It is also good. Examples of the rod-like body include an elastic body, a hollow body having a polygonal cross section, and a porous body. In this case, vibration absorption and vibration attenuation by the rod-like body can be expected, so that the shock wave attenuation can be enhanced while maintaining the outer shape and dimensions of the block as compared with the case of only the crushed stone body 4.

2, 2B, 2C, 2D, 2E, 2F, 2g, 2h, 2j ... Crushed stone aggregate block 3 ... Recessed 4 ... Crushed stone 4a ... Roadbed ballast 4b ... Artificial ballast 4c ... Polyhedron 4d ... Lattice structure 4M ... Metallized stone 6, 6B, 6C, 6E ... Mold 7 ... Small hole 8 ... Joining material 10 ... Hardened layer 12 ... Joined portion 14 ... Air gap 20 ... Flux material 22 ... Electrode 24 ... Switch 26 ... Power source 28 ... Electrolytic layer 30 ... Hard Film layer 34 ... Metal film 40 ... Rail 42 ... Sleeper 44 ... Roadbed 46 ... Special blending part

Claims (5)

A plurality of crushed stone bodies are joined by point contact, and the joint has a hardness equal to or higher than the hardness of the crushed stone body, and is a method for producing a crushed stone aggregate block integrally molded into a predetermined shape as a whole,
The manufacturing method which manufactures the said crushed stone aggregate block by performing the said joining by welding of the said metal layer about the said crushed stone body which has a metal layer on the surface. Manufacturing method in which a plurality of crushed stone body made of metal is welded to the contact portion in point contact, producing crushed stone aggregate block by integrally molded into a predetermined shape as a whole. A plurality of crushed stone bodies are joined by point contact, and the joint has a hardness equal to or higher than the hardness of the crushed stone body, and is a method for producing a crushed stone aggregate block integrally molded into a predetermined shape as a whole,
The manufacturing method which manufactures the said crushed stone aggregate block by joining the said crushed stone comprised with the raw material which can be plated by the plating process which forms a hard film. The manufacturing method according to any one of claims 1 to 3, wherein the space between the crushed stone bodies is manufactured as a void without a filler except for the joint portion. It is a manufacturing method as described in any one of Claims 1-4, Comprising: The crushed stone aggregate block group which comprises the crushed stone aggregate block group combining several types of crushed stone aggregate blocks comprised by the crushed stone body of different sizes. Manufacturing method .