JP2009097180A - Temporary road for railroad work, and combination block made of thermoplastic resin foam, for use in formation of the temporary road - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly-reliable temporary road for railroad work, which facilitates construction and removal operations. <P>SOLUTION: This temporary road 10 for the railroad work comprises a structure 20 and a guard plate 30 with flexibility, which covers a top surface of the structure 20. The structure 20 is constituted by combining at least a leg block 21A, which is made of a thermoplastic resin foam and formed in a bottom surface of a rectangular parallelepiped in such a shape with a recessed groove 22 as to straddle a railroad rail 2, with a rectangular block 21B, which is made of a thermoplastic resin foam and formed in a rectangular parallelepiped shape, and/or an inclined block 21C, which is made of a thermoplastic resin foam and formed in such a trapezoidal longitudinal-section or triangular shape as to have a top surface with an inclined plane. At least either of the rectangular block 21B and the inclined block 21C is superposed above the leg block 21A which constitutes the structure 20. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a temporary road for railway construction, and more particularly to a reliable temporary road for railway construction and a combination block made of thermoplastic resin foam for forming the temporary road that is easy to construct and remove. It is.

  Station platform or railway repair / improvement work is usually performed in a short time from the last train to the first train. At that time, a temporary road is constructed on a railroad rail in order to put heavy equipment for construction into a station platform or the like.

  This railway construction temporary road is generally constructed by stacking old sleepers, but it is necessary to stack many sleepers because they are heavy and their volume (size) is small. And the removal work was a time-consuming and heavy labor. In addition, there are cases in which scaffolds are assembled with single pipes and materials are transported on them, but in this case, it takes time to assemble and there is a risk of short circuits between tracks (between rails) because of the use of single steel pipes. There was also. In addition, there were cases where heavy cranes for work (yumbos, pile driving machines, etc.) and materials were lifted and carried in by large cranes, but in this case there was a problem of high costs due to contact with the overhead wires and enlargement of the cranes. It was.

  On the other hand, although it is not a temporary road for railway construction, a temporary road using a sandbag that can build a temporary road even if it is uneven and does not affect the soil of the place where the temporary road is built A method is disclosed in US Pat. Also, there is a method for constructing a temporary road using a resin frame block having a rectangular parallelepiped shape protected by a metal frame or a bag-like net in order to make it easy to construct and remove, and to be used repeatedly. Patent Document 2 or 3 discloses.

JP-A-2005-133406 JP-A-6-280210 Japanese Patent Laid-Open No. 7-233501

  However, in the method for constructing a temporary road using a sandbag disclosed in Patent Document 1, each of the sandbags is relatively heavy and needs to be stacked in the same manner as when sleepers are used. For this reason, when a temporary road for railway construction is constructed by this method, the construction and removal work is a time-consuming and labor-intensive work.

  Moreover, in the thing using the resin foam block disclosed by the said patent document 2, 3, although the construction and removal work will become easy, in the technique disclosed by this gazette It is not expected to build a temporary road on uneven ground, nor is it intended to build a slope-like temporary road, so it is necessary to build on a railroad with unevenness. When constructing a temporary road for railway construction that needs to be sloped so that heavy machinery can enter a station platform or the like, a highly reliable temporary road is constructed even using the technology disclosed in the publication. There was room for improvement.

  The present invention has been made in view of the background art described above, and its purpose is to facilitate construction and removal work, and to provide a reliable temporary road for railway construction and thermoplasticity for forming the temporary road. The object is to provide a combination block made of resin foam.

In order to achieve the above-described object, the present invention provides a temporary road for railway construction having the following configuration and a thermoplastic resin foam combination block for forming the temporary road.
[1] A leg block made of a thermoplastic resin foam formed in a shape having a concave groove straddling the railroad rail on the bottom surface of the rectangular parallelepiped, a rectangular block made of a rectangular parallelepiped thermoplastic resin foam, and / or a gradient on the upper surface A structure constructed by combining at least a sloped block made of a thermoplastic resin foam having a trapezoidal or triangular cross section with a surface, and an upper surface of the structure is composed of a protective plate, and constitutes the structure. A temporary road for railway construction, wherein at least one of the rectangular block and the inclined block is laminated above the leg block.
[2] The thermoplastic resin foam constituting the leg block, the square block, and the inclined block is a polystyrene-based resin-molded foamed-molded article, a polyolefin-based resin-molded foamed-molded article, and a polystyrene-based resin extruded foam. The temporary road for railway construction according to [1] above, which is either a molded body or a polyolefin resin extruded foam molded body.
[3] At least one of the leg block, the square block, and the inclined block is formed by laminating a plurality of plate-shaped polystyrene resin extruded foam molded products, or a plate-shaped polystyrene resin resin expanded foam molded product. The temporary road for railway construction according to the above [1], wherein a plurality of sheets are laminated.
[4] The temporary road for railway construction according to any one of [1] to [3], wherein the protective plate is a wood-based plywood, a plastic-based resin plate, or a rubber-based resin plate.
[5] The temporary road for railway construction according to any one of the above [1] to [4], wherein the structure has a slope shape.
[6] A thermoplastic resin foam leg block formed in a shape having a concave groove straddling the railroad rail on the bottom surface of the rectangular parallelepiped, a rectangular block made of a rectangular parallelepiped thermoplastic resin foam, and / or a gradient on the top surface A thermoplastic resin foam combination block for forming a temporary road for railway construction, comprising at least a sloped block made of a thermoplastic resin foam having a trapezoidal or triangular shape having a surface.

  According to the above-described temporary road for railway construction and the combination block made of thermoplastic resin foam for forming the temporary road according to the present invention, it is easy to construct and remove, and heavy equipment such as carry can also be self-propelled. A highly reliable temporary road for railway construction can be provided. In addition, by using the temporary road of the present invention, it is not necessary to carry in materials and equipment by a scaffold using a single pipe that may cause a short circuit between tracks, or a large crane that may be in contact with the overhead line, Highly safe work can be realized.

  Hereinafter, embodiments of a temporary road for railway construction according to the present invention and a combination block made of thermoplastic resin foam for forming the temporary road will be described in detail with reference to the drawings.

  FIG. 1 is a conceptual perspective view showing an example of a construction site of a temporary road for railway construction. In this construction site, railroad rails 2 are laid on both sides of the station platform 1. In the drawing, a railroad rail 2a is laid on the back side of the station platform 1, and a fence 3 on which a signboard is installed is built in the back. In the figure, two rails 2b and 2c are laid in parallel on the front side of the station platform 1, and a road 4 is further on the front side.

In recent years, there has been an increase in barrier-free, escalators, elevators, and other installations at station platforms, which are usually performed in a short time from the last train to the first train. At that time, it is advantageous from the viewpoint of work efficiency to put heavy equipment for construction into the station platform.
Therefore, also in the site shown in FIG. 1, for example, as shown in FIG. 2, a temporary road 10 is constructed on the rail 2 so that heavy equipment can be put into the station platform 1 from the road 4 on the near side. Is made.

  In the present invention, the temporary road 10 is composed of a structure 20 composed of a combination of blocks made of thermoplastic resin foam and a protective plate 30 covering the upper surface of the structure 20.

  A block 21 made of a thermoplastic resin foam for constructing the structure 20 includes, for example, a leg block 21A formed in a shape having a concave groove 22 straddling a railroad rail on the bottom surface of a rectangular parallelepiped as shown in FIG. A rectangular block 21B having a rectangular parallelepiped shape and a trapezoidal or triangular inclined block 21C having an inclined surface on the upper surface are used.

  The size of the block 21 is preferably designed to be 180 to 240 cm in length, 90 to 120 cm in width, and 40 to 60 cm in thickness from the viewpoint of transportability and work efficiency. Moreover, it is preferable from the balance of workability and intensity | strength that the magnitude | size of the ditch | groove 22 formed in 21 A of leg part blocks is designed by width 30-50cm and height 15-25cm. In addition, the said thickness in 21 C of inclination blocks means the thickness in the inclination direction center part of an inclined surface. Further, the concave groove 22 formed in the leg block 21A may be cut in the field.

The block 21 preferably has a compressive strength in the thickness direction of more than 100 kN / m ^2, and more preferably 280 kN / m ² or more. The higher the compressive strength of the block 21, the better. However, in the foam, since the compressive strength and the density are normally positively correlated, the higher the compressive strength, the higher the weight. Therefore, the upper limit of the compressive strength in the thickness direction of the block 21 is approximately 800 kN / m ² from the viewpoint of lightness and workability.
In addition, in this specification, the said compressive strength is a compressive stress at the time of deformation | transformation 10% based on the compression test according to JISK7220 (1999).

  Examples of the base resin of the thermoplastic resin foam constituting the block 21 include polystyrene resins such as polystyrene and impact-resistant polystyrene, polyolefin resins such as polyethylene and polypropylene, polybutylene succinate, polyethylene terephthalate, poly Polyester resins such as lactic acid, polycarbonate resins, polyurethane resins, polyphenol resins, etc. can be mentioned, but among them, polystyrene resins are used from the viewpoint of characteristics such as lightness, water resistance, durability, and cost. In view of toughness and oil resistance, it is preferable to use a polyolefin-based resin.

Examples of the foam formed using the base resin include an in-mold expanded particle molded body and an extruded foam molded body. As the block 21 of the present invention, any known foam can be used. it can. Specifically, polystyrene-based resin-molded expanded particle molded body, polyolefin-based resin-molded expanded particle molded body, polystyrene-based resin extruded foam molded body, or polyolefin-based resin extruded foam molded body can be preferably used.
The in-mold expanded particle molded body refers to a product in which pre-expanded expanded particles are filled in a mold and molded in-mold by steam heating or the like. On the other hand, the extrusion foamed molded product refers to a product obtained by foaming by adding a foaming agent to a resin heated and melted in an extruder and extruding the composition into a low temperature and low pressure region.

However, at least one block 21 of the leg block 21A, the square block 21B, and the inclined block 21C is formed by laminating a plurality of plate-like polystyrene resin extruded foams, or in a plate-like polystyrene resin mold. It is more preferable that a plurality of foamed particle compacts are laminated. This is because the block 21 formed by laminating a plurality of foam plates can absorb and disperse the load from above due to misalignment between layers, or the laminating surface contributes to strength improvement, It is preferable because it becomes more excellent in strength, and particularly in a case where a plurality of polystyrene resin extruded foam molded products are laminated, it is particularly preferable because it has an excellent balance between compressive strength and bending strength. . In addition, as a method of laminating a plurality of foam plates, a method of adhering each foam plate with an adhesive, heat, or the like, a method of simply laminating each foam plate without adhering and bundling the band around the outer periphery, etc. It is done. In the embodiment of FIG. 3, the leg block 21A ₁ , the square block 21B ₁ , and the inclined block 21C ₁ having a triangular longitudinal section are integrally formed, and the leg block 21A ₂ , the square blocks 21B ₂ , 21B ₃ , the longitudinal section The trapezoidal inclined block 21C ₂ was a laminated product of foamed plates.

In the temporary road 10 according to the present invention, the structural body 20 is first constructed by combining at least the leg block 21A, the square block 21B and / or the inclined block 21C.
An example of the construction procedure of the structure 20 will be described with reference to FIGS.

  First, as shown in FIG. 4, the leg block 21 </ b> A is arranged so that the rail 2 enters the concave groove 22 formed in the leg block 21 </ b> A, and between the station platform 1 and the rail 2. In addition, a rectangular block 21B is disposed in the gap between the rail 2 and the rail 2. In addition, the unevenness | corrugation at the time of block arrangement | positioning can be adjusted by cutting the lower surface and / or upper surface of each block 21 using a nichrome wire cutting machine. Subsequently, as shown in FIG. 5, a rectangular block 21B is formed on the upper side and the front side (left side in FIG. 4) so that a slope inclined from the station platform 1 toward the road 4 is formed, that is, the station A large number of steps (three steps including the leg block 21A in the embodiment) are arranged on the home 1 side, and one or zero steps are arranged on the road 4 side so as to be low. Subsequently, as shown in FIG. 6, the inclined block 21 </ b> C is appropriately arranged on the upper side and the near side (left side in FIG. 5) so as to form a slope without unevenness.

  An important matter in the structure 20 constructed as described above is that at least either the square block 21B or the inclined block 21C is laminated above the leg block 21A constituting the structure 20. (In the embodiment, as shown in FIG. 6, above the leg block 21A closest to the station platform 1 side, there are two layers of rectangular blocks 21B and one layer of inclined blocks 21C. And a single inclined block 21C is laminated above the leg block 21A located closest to the road 4). Accordingly, the leg block 21A, which is highly likely to be broken by a load from above due to the presence of the concave groove 22, can be effectively protected by the blocks stacked above the leg block 21A, and the breakage can be prevented. In addition, from the viewpoint of stability of the structure 20 and further from the viewpoint of performing load distribution more effectively, the blocks 21 are stacked in a staggered arrangement (arrangement where the abutting portions of the left and right blocks do not match in the vertical direction). It is preferable to do so.

  In the present invention, a protection plate 30 is laid on the upper surface of the constructed structure 20.

  Examples of the protective plate 30 include well-known wood-based plywood used for ground curing and ground securing at construction sites, etc., or plastic-based resin plates and rubber-based resin plates. A wood-based plywood that is frequently used is particularly preferably used. Among the wood-based plywood, a structural plywood stipulated in JAS (Japanese Agricultural Standard) is particularly preferably used, and specifically, a structural plywood conforming to JAS1 class can be used. As the plastic resin plate, specifically, a resin flooring “DAIKOKU board” (registered trademark) manufactured by Keiyo Kogyo Co., Ltd. can be used. Further, the thickness of the protective plate 30 is preferably 9 to 18 mm in view of the balance between strength and flexibility (flexibility), and the length and width dimensions of the protective plate 30 are in terms of transportability and work efficiency. From 100 to 200 cm in length and 40 to 100 cm in width are preferable.

FIG. 7 shows a cross-sectional shape of the temporary road 10 constructed by the above operation.
In the temporary road 10, the unevenness due to the rail 2 is eliminated by the leg block 21 </ b> A having the concave groove 22, and the rectangular block 21 </ b> B and / or the inclined block laminated on the upper side and the near side (left side in FIG. 7). In combination with 21C, a slope-like structure 20 that is gently inclined from the station platform 1 toward the road 4 is constructed, and a protective board 30 such as a wood-based plywood is laid on the upper surface of the structure 20 It becomes. The construction work of the temporary road 10 can be performed easily and in a short time since the main work is a work of stacking the blocks 21 made of lightweight thermoplastic resin foam.

  Using the constructed temporary road 10, heavy equipment such as vehicles loaded with construction materials can enter the station platform 1 from the road 4. At this time, the load accompanying the passing of the heavy machinery is the absorption and dispersion of the load due to the deformation of the rectangular block 21B and / or the inclined block 21C stacked above the leg block 21A, and the protective plate 30 arranged on the upper surface. In the case of the one having flexibility, it is not directly transmitted to the leg block 21A which is most likely to be destroyed due to the presence of the concave groove 22 due to the load absorption and dispersion action due to the deformation of the protective plate. Is effectively prevented, resulting in a highly reliable temporary road.

  The temporary road 10 constructed as described above and used for entering heavy machinery will be removed before the first operation. The removal work of the temporary road 10 is the reverse of the constructed procedure, that is, the protective plate 30 is first removed, and then the blocks 21 stacked from above are removed. The removal work can be performed easily and in a short time. In addition, after removal, the temporary road construction part can be restored to its original state without any special work. Then, the dismantled block 21 is transferred to a nearby storage location, stacked, stored, and reused at a later date.

The embodiments of the temporary road 10 for railway construction and the thermoplastic resin foam combination block 20 for forming the temporary road according to the present invention have been described above. However, the present invention is limited to the embodiments described above. It is obvious that various modifications and changes can be made within the scope of the technical idea of the present invention described in the claims.
For example, in the above-described embodiment, a case has been described in which a slope-like temporary road 10 is constructed so that heavy equipment can enter the station platform 1 from the road 4, but the station platforms formed in parallel across the railroad rails. The present invention can also be applied to a temporary road that connects each other and has a horizontal upper surface. Embodiments of the temporary road having such a configuration are shown in FIGS. 8 to 11, and the same reference numerals are given to the same objects or members as those of the above-described embodiment. FIG. 8 is a diagram showing a construction site of the temporary road 50, and the platform platforms 1A and 1B are formed in parallel between the two rails 2b and 2c. As shown in FIG. 9, the temporary road 50 is formed so as to connect the station platforms 1 </ b> A and 1 </ b> B, and is composed of a combination of blocks made of thermoplastic resin foam as in the above embodiment. The structure 20 includes a protection plate 30 that covers the upper surface of the structure 20. As shown in FIG. 10, the structure 20 is constructed by stacking one rectangular block 21 </ b> B above the leg block 21 </ b> A. Further, as shown in FIG. 11, the rectangular block 21B ₃ having a small thickness is laminated on the leg block 21A, and the rectangular block 21B is further laminated thereon. The temporary road 50 having a horizontal top surface formed in this way is easy to construct and remove, and is a highly reliable temporary road for railway construction in which heavy equipment such as carry can also be self-propelled.

Test example

  Hereinafter, test examples that have found the present invention will be described.

[Use materials and equipment]
-Block-
・ Leg block Polystyrene resin extruded foam (density 29 kg / m ³ , compressive strength 340 kN / m ² , thickness 100 mm) 1 sheet, outer dimensions: 330 × 330 × 100 mm, concave groove: height 40 mm, width 180 mm .
-One square block polystyrene resin extruded foam (density 29 kg / m ³ , compressive strength 340 kN / m ² , thickness 100 mm), outer dimensions: 330 × 330 × 100 mm.
−Protection plate−
-Wood-based plywood Structural plywood conforming to JAS (Japan Agricultural Standards) Class 1, outer dimensions: 330 x 330 x 4 mm
-Metal plate Made of iron, outer dimensions: 330 x 330 x 9 mm.
-Testing machine-
・ Compression tester
Made by Shimadzu Corporation: G-5000B
・ Concentrated load application jig Wooden, pressure surface: 100 × 100 mm.

[Test example]
-Test Example 1
With the rectangular block placed on the leg block, and further with the wood-based plywood placed thereon, a concentrated load is applied to the center as shown in FIG. It was compressed and deformed to about 30% strain.
-Test Example 2-
With the rectangular block placed on the leg block and the wood-based plywood placed thereon, a concentrated load is applied to the end as shown in FIG. 13 by the compression tester. , Compression deformation to about 30% strain.
-Test Example 3-
With the rectangular block placed on the leg block and the metal plate placed thereon, a concentrated load is applied to the end as shown in FIG. It was compressed and deformed to about 30% strain.
-Test Example 4-
With the wood-based plywood placed on the leg block, a concentrated load was applied to the center as shown in FIG. 14 by the compression tester to compress and deform to about 20% strain.

〔Test results〕
-Test Example 1
Although compression deformation was performed up to about 30% strain, no crack or breakage occurred in the leg block.
-Test Example 2-
Only the vicinity of the end where the concentrated load was applied was recessed, and the entire upper surface was not inclined. Further, no crack or breakage occurred in the concave groove of the leg block.
-Test Example 3-
The entire upper surface became an inclined surface.
-Test Example 4-
At about 20% strain, a large crack occurred at the base of the leg forming the concave groove of the leg block.

It is the perspective view which showed notionally an example of the construction site of the temporary road for railway constructions. It is the perspective view which showed notionally the example which constructed | assembled the temporary road for railroad construction which concerns on this invention in the construction site of FIG. It is the perspective view which showed the block used for construction of the temporary road for railway construction concerning this invention, Comprising: (a) The perspective view which showed the example of the leg block, (b) showed the example of the square block A perspective view and (c) are perspective views showing an example of an inclined block. It is the conceptual side view which showed the construction work middle of the temporary road for railroad works which concerns on this invention. It is the conceptual side view which showed the construction work middle of the temporary road for railroad works which concerns on this invention. It is the conceptual side view which showed the construction work middle of the temporary road for railroad works which concerns on this invention. It is the side view which showed notionally an example of the temporary road for railway constructions concerning this invention. It is the perspective view which showed notionally the other example of the construction site of the temporary road for railway constructions. It is the perspective view which showed notionally the other example which constructed | assembled the temporary road for railroad construction which concerns on this invention in the construction site of FIG. It is the side view which showed notionally the other example of the temporary road for railway constructions concerning this invention. It is the side view which showed notionally the further another example of the temporary road for railroad works which concerns on this invention. It is the figure which showed notionally how to apply the load of the test example 1, Comprising: (a) is a side view, (b) is a top view. It is the figure which showed notionally how to apply the load of the test examples 2 and 3, Comprising: (a) is a side view, (b) is a top view. It is the figure which showed notionally how to apply the load of the test example 4, Comprising: (a) is a side view, (b) is a top view.

Explanation of symbols

1, 1A, 1B Station platform 2, 2a, 2b, 2c Railway rail 3 Fence 4 Road 10, 50 Temporary road 20 Structure 21 block 21A, 21A ₁ , 21A ₂ leg block 21B, 21B ₁ , 21B ₂ , 21B ₃ Square block 21C, 21C ₁ , 21C ₂ Inclined block 22 Concave groove 30 Protection plate

Claims (6)

  A leg block made of thermoplastic resin foam formed in a shape having a concave groove straddling the railroad rail on the bottom surface of the rectangular parallelepiped, and a rectangular block made of a rectangular parallelepiped thermoplastic resin foam and / or an inclined surface on the upper surface The structure is composed of a structure constructed by combining at least a sloped block made of a thermoplastic resin foam having a trapezoidal or triangular cross section, and a protective plate covering the upper surface of the structure. A temporary road for railway construction, wherein at least one of the rectangular block and the inclined block is laminated above the leg block.   The thermoplastic resin foam constituting the leg block, the square block and the inclined block is a polystyrene resin mold-internal foam particle molding, a polyolefin resin in-mold foam particle molding, a polystyrene resin extrusion foam molding, Alternatively, the temporary road for railway construction according to claim 1, wherein the temporary road is a polyolefin resin extruded foam.   At least one of the leg block, the square block, and the inclined block is a laminate of a plurality of plate-like polystyrene resin extruded foam moldings, or a plurality of plate-like polystyrene resin-in-mold foam particle moldings. The temporary road for railway construction according to claim 1, wherein the temporary road is for railway construction.   The temporary road for railway construction according to any one of claims 1 to 3, wherein the protective plate is a wood-based plywood, a plastic-based resin plate, or a rubber-based resin plate.   The temporary road for railway construction according to any one of claims 1 to 4, wherein the structure has a slope shape.   A leg block made of thermoplastic resin foam formed in a shape having a concave groove straddling the railroad rail on the bottom surface of the rectangular parallelepiped, and a rectangular block made of a rectangular parallelepiped thermoplastic resin foam and / or an inclined surface on the upper surface A combination block made of thermoplastic resin foam for forming a temporary road for railway works, comprising at least a sloped block made of thermoplastic resin foam having a trapezoidal or triangular cross section.

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