Road structure and road construction method

Abstract

To provide a road structure and a road construction method with which road flatness is unlikely to be compromised while a maintenance cost can be suppressed to some extent with the same construction cost.SOLUTION: A road structure 10, which is used at railroad crossings, includes a railroad track area 20 and a non-railroad track area 30 in plan view. The railroad track area 20 is a portion where railroad tracks and road intersect, and has, for example, the same cross-sectional structure with railroad tracks different from the road structure 10. The non-railroad track area 30 is an area adjacent to the railroad track area 20. The surface of the non-railroad track area 30 is composed of pavement blocks. Cell assemblies and first filling materials are provided below the pavement blocks 320. Unlike the non-railroad track area 30, the railroad track area 20 preferably does not include cell assemblies and first filling materials.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a road structure and a road construction method applied to a railroad crossing. [Background technology]

[0002] Cell assemblies, such as geocells, are used in a variety of places, for example, the geocells described in Patent Document 1 are said to be suitable for reinforcing roadways, pavements, storage areas, and railroad roadbeds and / or sub-roadbeds. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2012-504058 Summary of the Invention [Problem to be solved by the invention]

[0004] When carrying out construction of new, temporary or improved railroad crossings, the structure of the road used at the crossing may be required to be such that maintenance costs can be kept to a certain level while maintaining the same construction costs, and that it is resistant to deterioration over time, for example, to a decrease in flatness.

[0005] The object of the present invention is to provide a road structure and road construction method that can be applied to the construction of new, temporary, and improved railroad crossings, etc., which has the same construction costs but reduces maintenance costs to a certain extent and is less likely to deteriorate in flatness. [Means for solving the problem]

[0006] According to one aspect of the present invention, there is provided a road structure for use at a railroad crossing, comprising: A rail area intersecting the rail line; a non-line area adjacent to the line area; It has The non-line region is Paving blocks and A cell assembly located below the paving block and connecting a plurality of cells; A first filler filled in the plurality of cells; A road structure is provided, comprising:

[0007] According to one aspect of the present invention, there is provided a construction method for a road used for a railroad crossing, comprising the steps of: A rail area intersecting the rail line; a non-line area adjacent to the line area; It has When constructing the non-rail area, A cell assembly in which a plurality of cells are connected, and a first filler material filled in the plurality of cells are disposed; A road construction method is provided in which paving blocks that will form a road surface are placed above the cell assembly and the first filler material. Effect of the Invention

[0008] According to one aspect of the present invention, it is possible to provide a road structure and a road construction method that can reduce maintenance costs to a certain extent while maintaining the same construction costs and is less likely to deteriorate flatness. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is a plan view of the road structure according to the embodiment. [Diagram 2] FIG. 2 is a diagram showing an example of a cross section AA of FIG. [Diagram 3] FIG. 2 is a diagram showing an example of a cross section BB of FIG. [Figure 4] FIG. 4 is an example of an exploded perspective view of a non-line region. [Diagram 5] FIG. 4 is a diagram showing an example of a cross-sectional structure of a non-line region. [Figure 6] FIG. 6 is an exploded perspective view of the non-line region shown in FIG. 5. [Figure 7] FIG. 4 is a diagram showing an example of a cross-sectional structure of a non-line region. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all the drawings, the same components are given the same reference numerals and the description will be omitted as appropriate.

[0011] [First embodiment] 1 is a plan view of a road structure 10 according to this embodiment. The road structure 10 is a structure for a road used at a railroad crossing, and includes a railroad track area 20, a non-railroad track area 30, and an external area 40 in plan view.

[0012] The rail track area 20 is a portion where the rail track and the road intersect, and has, for example, the same cross-sectional structure as a rail track other than the road structure 10. For this reason, unlike the non-rail track area 30, the rail track area 20 does not have a cell assembly 330 and a first filler material 340 described below.

[0013] The non-railway area 30 is an area adjacent to the railroad area 20. The surface of the non-railway area 30 is composed of paving blocks 320. Under the paving blocks 320, a cell assembly 330 and a first filler 340, which will be described later, are provided.

[0014] The outer area 40 is an area separated from the railroad area 20, and has the same cross-sectional structure as, for example, an ordinary road.

[0015] The road structure 10 is used, for example, when constructing new, temporary, or improved railroad crossings. In such cases, the characteristics required for the road structure 10 are (1) that the maintenance costs can be suppressed to a certain extent while the construction costs are the same, and (2) that the flatness is not easily deteriorated. According to this embodiment, since the cell assembly 330 and the first infill material 340 are used in the non-railway area 30, the above two characteristics can be satisfied, as will be described in detail later.

[0016] 2 is a diagram showing an example of the BB cross section of FIG. 1, that is, a diagram showing an example of the cross-sectional structure of the track area 20. In the example shown in this figure, the track area 20 has a sleeper 210 and a track bed 220 in addition to the rail 22. The sleeper 210 may be made of concrete, wood, or other materials. The track bed 220 is, for example, ballast, but may also be made of concrete. Here, the cross-sectional structure of the track area 20 is similar to the cross-sectional structure of an area of ​​the track that is different from the road structure 10.

[0017] However, even in the railroad track area 20, a cell assembly 330 and a first middle filler 340, which will be described later, may be provided below the track bed 220.

[0018] 3 is a diagram showing an example of the BB cross section of FIG. 1, that is, a diagram showing an example of the cross-sectional structure of the non-rail area 30. FIG. 4 is an example of an exploded perspective view of the non-rail area 30. In the example shown in these figures, the non-rail area 30 has a configuration in which a base material 310, a cell assembly 330, a first filler material 340, and a paving block 320 are stacked in this order on the roadbed. The cell assembly 330 and the paving block 320 are arranged in a recess provided in the base material 310.

[0019] The base material 310 is, for example, gravel around the rails and sleepers, i.e., ballast. The base material 310 also covers the side of the road structure 10 that is not in contact with the road structure 10 and the external area 40, as shown in FIG.

[0020] The cell assembly 330 is, for example, a geocell, and has a structure in which a number of cells are connected. For example, the cell assembly 330 is made by arranging a number of strips of long resin or fiber sheets in parallel in the width direction, repeating them in a staggered pattern at a predetermined interval, and partially connecting them at connecting portions at regular intervals. In this case, the cell assembly 330 has a honeycomb structure. The area between the connecting portions constitutes one cell. The upper and lower surfaces of the cell are open.

[0021] The first filler 340 is filled into the cells of the cell assembly 330. The first filler 340 is, for example, crushed stone. The maximum peak value in the particle size distribution of the crushed stone is smaller than the maximum peak value in the particle size distribution of the ballast that becomes the base material 310. In other words, the crushed stone used as the first filler 340 is finer than the ballast that becomes the base material 310.

[0022] The first intermediate filling material 340 may be one or more of materials other than crushed stone, such as soil, gravel, locally generated soil, sandbags containing these materials, concrete, mortar, various cement materials, etc.

[0023] The paving blocks 320 are blocks that make up the road surface. By using the paving blocks 320, the road structure 10 becomes easier to construct and easier to remove.

[0024] Next, an example of a construction method for the road structure 10 will be described. In this construction method, it is assumed that the rails 22 are laid in advance. That is, the structure of the track area 20 of the road structure 10 is the same as the structure that is provided in advance as the foundation for the rails 22.

[0025] First, a recess is formed in the area adjacent to the rail 22, in the portion that will become the crossing, i.e., the non-rail area 30. Next, this recess is usually formed in the base material 310. Next, the cell assembly 330 is placed on the base material 310 with the cells spread out, and further, a first filler material 340 is filled into each cell of the cell assembly 330. Thereafter, the paving blocks 320 are laid on the cell assembly 330 and the first filler material 340. In this manner, the non-rail area 30 is constructed adjacent to the rail area 20.

[0026] The outer region 40 may be constructed before the non-line region 30 or after the non-line region 30.

[0027] When the road structure 10 is used as a temporary railroad crossing, it is necessary to remove the non-railroad area 30 of the road structure 10 after the period of use of the temporary railroad crossing has expired. In this case, the paving blocks 320 are removed, the cell assemblies 330 are divided into a plurality of parts, and then the cell assemblies 330 and the first infill material 340 are removed for each part. The cost required for this removal is relatively low.

[0028] According to the above-mentioned road structure 10, the cell assembly 330 and the first infill material 340 are provided below the paving block 320. Therefore, the load applied to the paving block 320 when a vehicle or the like passes over it is mainly transmitted to the first infill material 340. Here, the first infill material 340 is partitioned into a plurality of regions by the cell assembly 330. Therefore, the first infill material 340 is prevented from moving laterally due to the load from the paving block 320, and this makes it possible to prevent the paving block 320 from sinking and causing a step between the railroad area 20 and the non-railroad area 30.

[0029] In addition, as described above, since the occurrence of steps between the railroad area 20 and the non-railroad area 30 can be suppressed, the cost required for maintaining the road structure 10 is reduced. In addition, there is almost no increase in the construction cost of the road structure 10.

[0030] Furthermore, when the rail track region 20 of the road structure 10 does not have the cell assembly 330 and the first fill material 340, the construction cost of the road structure 10 is reduced.

[0031] [Second embodiment] Fig. 5 is a diagram showing an example of a cross-sectional structure of the non-rail area 30 used in the road structure 10 according to this embodiment, and corresponds to Fig. 3 of the first embodiment. Fig. 6 is an exploded perspective view of the non-rail area 30 shown in Fig. 5. The road structure 10 according to this embodiment has the same configuration as the road structure 10 according to the first embodiment, except that the non-rail area 30 has an elastic sheet 350 and a second filler 360.

[0032] The elastic sheet 350 and the second filler 360 are positioned between the paving block 320 and the layer including the cell assembly 330 and the first filler 340. The elastic sheet 350 is a resin sheet, for example a rubber sheet, and is provided to absorb unevenness of the layer consisting of the cell assembly 330 and the first filler 340. The elastic sheet 350 also has the function of suppressing the position of the paving block 320 from shifting. The thickness of the elastic sheet 350 is, for example, 1 cm or more and 10 cm or less, but is not limited to this range.

[0033] The elastic sheet 350 has a plurality of openings 352. The planar layout of the openings 352 may or may not be regular. The second filler 360 is filled in the openings 352. The second filler 360 is made of finer material than the first filler 340, such as washed sand. As an example, the maximum peak value in the particle size distribution of the second filler 360 is smaller than the maximum peak value in the particle size distribution of the first filler 340.

[0034] Although not shown, the second filler 360 may also be provided on the upper surface of the elastic sheet 350, i.e., between the paving block 320 and the elastic sheet 350. In this case, almost the entire lower surface of the paving block 320 will be in contact with the second filler 360.

[0035] Also, the elastic sheet 350 may not have the openings 352. In this case, the second filler 360 is not provided or is laid between the elastic sheet 350 and the paving block 320.

[0036] The construction method of the road structure 10 using this non-railway area 30 is similar to the construction method of the road structure 10 of the first embodiment, except that after forming the cell assembly 330 and the first filler material 340, and before placing the paving blocks 320, an elastic sheet 350 is laid on top of the cell assembly 330 and the first filler material 340, and the second filler material 360 is filled into the openings 352 of the elastic sheet 350.

[0037] This embodiment also provides the same effects as the road structure 10. In addition, since the elastic sheet 350 and the second filler 360 are provided, the horizontality of the paving blocks 320 is improved, and the horizontal movement of the paving blocks 320 can be suppressed.

[0038] Third embodiment Fig. 7 is a diagram showing an example of the cross-sectional structure of the non-rail area 30 used in the road structure 10 according to this embodiment, and corresponds to Fig. 3 of the first embodiment. The road structure 10 according to this embodiment is similar to the road structure 10 according to the first or second embodiment, except that the non-rail area 30 has a water infiltration suppression sheet 370. Note that this diagram shows the same case as the second embodiment.

[0039] The water infiltration suppression sheet 370 covers at least the upper surfaces of the cell assembly 330 and the first filler material 340. In the example shown in the figure, the water infiltration suppression sheet 370 covers the upper surface, side surfaces, and lower surface of the cell assembly 330 and the first filler material 340. The water infiltration suppression sheet 370 does not have to cover a portion of the outermost peripheral side surface of the cell assembly 330. In this case, the portion is exposed from the water infiltration suppression sheet 370. The water infiltration suppression sheet 370 is, for example, a nonwoven fabric. The water infiltration suppression sheet 370 does not have to cover the lower surface of the cell assembly 330.

[0040] By covering the upper surfaces of the cell assembly 330 and the first filler material 340 with the water infiltration suppression sheet 370, at least a portion of water such as rainwater reaches the base material 310 through the water infiltration suppression sheet 370. Therefore, excessive penetration of water into the first filler material 340 is suppressed.

[0041] In addition, when the undersides of the cell assembly 330 and the first filler 340 are also covered with the water infiltration suppression sheet 370, the first filler 340 and the base material 310 are prevented from being physically mixed together. That is, the base material 310 and the layer consisting of the cell assembly 330 and the first filler 340 are clearly separated. Since the water infiltration suppression sheet 370 is deformable, the portion of the water infiltration suppression sheet 370 located on the underside of the first filler 340 deforms along this underside and becomes uneven. This unevenness meshes with the base material 310. Therefore, the layer consisting of the cell assembly 330 and the first filler 340 and the paving block 320 are prevented from moving in the horizontal direction.

[0042] Although the embodiments of the present invention have been described above with reference to the drawings, these are merely examples of the present invention, and various configurations other than those described above can also be adopted. [Explanation of symbols]

[0043] 10 Road structure 20 Track area 22 railroad track 30 Non-track area 40 External area 210 Sleepers 220 Dodoko 310 Base material 320 Paving Blocks 330 Cell Assembly 340 First filling material 350 Elastic Sheet 352 Aperture 360 Second filling material 370 Water ingress prevention sheet

Claims

1. A road structure used at a railroad crossing, comprising: A rail area intersecting the rail line; a non-line area adjacent to the line area; It has The non-line region is Paving blocks and A cell assembly located below the paving block and connecting a plurality of cells; A first filler filled in the plurality of cells; A road structure having:

2. 2. The road structure according to claim 1, A road structure, wherein the railroad area does not have the cell assembly and the first infill material below the railroad.

3. The road structure according to claim 1 or 2, A road structure, wherein the non-rail area has an elastic sheet positioned between the cell assembly and the paving block.

4. 4. The road structure according to claim 3, wherein the elastic sheet has an opening, Further comprising a second filler filled in the opening, A road structure, wherein a maximum peak value in the particle size distribution of the second filler is smaller than a maximum peak value in the particle size distribution of the first filler.

5. 5. The road structure according to claim 4, The second infill is also located between the paving block and the resilient sheet.

6. The road structure according to claim 1 or 2, The road structure further comprises a water infiltration control sheet covering at least an upper surface of the cell assembly and the first filler.

7. 7. The road structure according to claim 6, The road structure, wherein the water infiltration suppression sheet is a nonwoven fabric.

8. A construction method for a road used for a railroad crossing, comprising: A rail area intersecting the rail line; a non-line area adjacent to the line area; It has When constructing the non-rail area, A cell assembly in which a plurality of cells are connected, and a first filler filled in the plurality of cells are disposed; a paving block that will form a road surface is placed above the cell assembly and the first filler material.

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