JP4829616B2 - Railbag for railroad ballast and roadbed replacement method when switching railway tracks - Google Patents

Description

  The present invention relates to a soil bag for a railway road floor ballast that has a strength that does not break even when a roadbed ballast is stored and vibrationally compressed by a roadbed replacement method or the like at the time of track switching work, and a roadbed that is used at the time of track switching work using this sandbag. It relates to the replacement method.

  As shown in FIGS. 5 (A) and 5 (B), when railway tracks 301 and 302 are laid and railway business is carried out in the railway, along with repair work of the river 304 (river widening, etc.) Therefore, the bridge 306 of the railroad track 302 needs to be replaced with a new bridge 307, and the railroad track 302 (hereinafter referred to as “old line”) is switched to the new railroad track 303 (hereinafter referred to as “new line”). Construction (hereinafter referred to as “track switching construction”) may be performed. In addition, in the case of construction work on a railway viaduct, track switching work is also performed in the case where a track is once transferred from a business line (main line) to a temporary line, or when returning from the temporary line to the main line.

  In the track switching work of FIG. 5, the track is switched from the location 308 of the old line 302 to the location 309 of the new line 303, and the track is switched from the location 310 of the old line 302 to the location 311 of the new line 303. The locations 308 to 311 are hereinafter referred to as “switching points”. As shown in FIG. 6A, the track switching work is a manual work by a large number of workers.

  The track switching work is performed at night by temporarily prohibiting the traveling of the train in the section, but since the work time is very short, the “roadbed replacement method” is often adopted. As shown in Fig. 6 (B) and Fig. 6 (C), the road bed replacement method is used to switch part of the road bed ballast near the switching point (gravel and crushed stone installed between the sleeper and the roadbed). As a preparatory work, the ballasted clay 315 is replaced in advance before the switching work. The ballast-containing sandbag 315 is formed by packing a ballast (gravel or crushed stone) in a sandbag and binding the mouth. The ballast-containing sandbag 315 is replaced and installed on the outside or inside of the two rails as necessary in the roadbed ballast (gravel and crushed stone installed between the sleeper and the roadbed).

  At the switching point 308 of the old line 302, the train travels during the period until the track switching work is started. The ballast-containing soil 315 is simply piled up, and is resistant to a horizontal force (force acting in the horizontal direction perpendicular to the rail traveling direction) that is transmitted from the railway vehicle to the rail and acts on the roadbed ballast (hereinafter referred to as “the roadbed”). It is called “lateral resistance”. For this reason, as shown in FIG. 7 (A), the worker 320 applies vibration to the ballast-containing soil 315 by means of a vibration compactor 321 (equipment used for compaction of asphalt pavement, etc.) and compacts (hereinafter, referred to as “compact”). This is called “rolling”.

  However, the conventional sandbag has a problem that it is easily damaged when ballast (gravel or crushed stone) is packed and the mouth is bound and rolled by the vibration compactor 321. If the rolling compaction by the vibration compactor 321 is weakened so as not to be damaged, the lateral resistance force of the road bed is insufficient, and there is a risk that the track will be displaced at the time of preparation work for the track switching work.

In addition, at the start of the track switching work, the ballast-filled sandbag 315 installed near the switching point is removed to form a “railway” composed of rails and sleepers. In this way, by the manual work of many workers, it is moved horizontally and switched from the old line to the new line.
However, conventionally, as shown in FIG. 7B, the worker 320 had to manually remove the ballast-containing soil bags 315 one bag at a time, which was not efficient.

Conventionally, an example of a sandbag with high strength is also known (see Patent Document 1). However, the specific configuration is not clear. In addition, the roadbed replacement method at the time of railroad track switching construction uses a large number of sandbags, so it is also necessary that the cost be low.
JP 2001-271301 A

  The present invention has been made to solve the above-mentioned problem, and the problem to be solved by the present invention is a sandbag for railroad floor ballast having a strength that does not break even when packed with ballast and subjected to vibration rolling. Another object of the present invention is to provide a roadbed replacement method at the time of railroad track switching work using this sandbag.

In order to solve the above problems, a sandbag for railroad floor ballast according to claim 1 of the present invention,
A plurality of synthetic fiber members warp member comprising a first string-like material as a yarn bundle in a plate shape overlapping separately double, second string-like multiple synthetic fiber members as yarn bundle tabular Folded woven fabric members made in a substantially rectangular shape so that the weft members made of two separate layers of material are staggered, folded in a substantially rectangular shape, and two pieces corresponding to the sides The woven fabric member is stitched together with a sewing thread member, and the two woven fabric members corresponding to the bottom portion are sewn together with the sewing thread member to form a bag body having an open top, and a third string in which a plurality of synthetic fiber members are bundled In the state where the lace member for squeezing the upper opening of the bag body to close the bag by twisting a plurality of strip-like materials into a rope shape is arranged inside the upper edge of the upper opening of the bag body A lanyard formed by folding the edge inward and stitching together with a thread member The tensile strength of the woven fabric member is 1000 N / 5 cm or more according to a test method defined in JIS L 1096-1999, and the tensile strength of the mouth strap member is 1000 N / in according to a test method defined in JIS L 1096-1999. One or more and the tensile strength of the seam is 1000 N / 1 bag or more by a test method defined in JIS L 1096-1999.

Moreover, the road bed replacement method at the time of railway track switching construction according to claim 2 of the present invention is:
For railroad track switching work, as preparatory work before switching, replace the old and new roadbed ballast near the switching point with a ballasted sandbag in which crushed stones are packed in a sandbag and the mouth strap members are bound together, At the time of switching, when the railway track is switched, the ballast containing the ballast is removed, the rail made of rails and sleepers is connected to the new line, and the ballast is removed from the ballasted soil and restored to the periphery of the rail. In the road bed replacement method of
The sandbag is
A plurality of synthetic fiber members warp member comprising a first string-like material as a yarn bundle in a plate shape overlapping separately double, second string-like multiple synthetic fiber members as yarn bundle tabular Folded woven fabric members made in a substantially rectangular shape so that the weft members made of two separate layers of material are staggered, folded in a substantially rectangular shape, and two pieces corresponding to the sides The woven fabric member is stitched together with a sewing thread member, and the two woven fabric members corresponding to the bottom portion are sewn together with the sewing thread member to form a bag body having an open top, and a third string in which a plurality of synthetic fiber members are bundled In the state where the lace member for squeezing the upper opening of the bag body to close the bag by twisting a plurality of strip-like materials into a rope shape is arranged inside the upper edge of the upper opening of the bag body A lanyard formed by folding the edge inward and stitching together with a thread member The tensile strength of the woven fabric member is 1000 N / 5 cm or more according to a test method defined in JIS L 1096-1999, and the tensile strength of the mouth strap member is 1000 N / in according to a test method defined in JIS L 1096-1999. One or more and the tensile strength of the seam is 1000 N / 1 bag or more by a test method defined in JIS L 1096-1999.

Moreover, the road bed replacement method at the time of railway track switching construction according to claim 3 of the present invention is:
In the road bed replacement method at the time of railway track switching construction according to claim 2 ,
A substantially annular lifting ring portion is formed by the remaining portion of the mouth strap member bound to the ballast-containing clay, and when the ballast-containing soil is removed at the time of the line switching, a plurality of ballast-containing soil-lifting rings. It is characterized by the fact that a plurality of ballast-containing sandbags are simultaneously lifted and removed by a construction machine.

According to the sandbag for railroad floor ballast according to the present invention, a warp member formed by laminating a plurality of synthetic fiber members in a flat plate shape as a first string-like material, and a plurality of synthetic fibers. What produced the woven fabric member which carried out the double woven fabric member in the shape of a substantially rectangle shape so that the 2nd string-like material as a thread which bundled the member in the shape of a flat may be alternated with the weft member which piles up separately separately. A bag which is folded at substantially the center and sews the two woven fabric members corresponding to the side portion with a sewing thread member, and sews the two woven fabric members corresponding to the bottom portion with the sewing thread member and has an upper opening. A tie member for closing the bag by squeezing the upper opening of the bag body by twisting a plurality of third string-like materials made by bundling a plurality of synthetic fiber members into a rope shape, The upper edge is placed inside the upper edge of the upper opening. The woven fabric member has a tensile strength of 1000 N / 5 cm or more according to a test method defined in JIS L 1096-1999, and the tensile strength of the lace member is Since the test method defined in JIS L 1096-1999 is 1000 N / 1 or more and the tensile strength of the seam is 1000 N / 1 bag or more by the test method defined in JIS L 1096-1999, Even if it is packed and subjected to sufficient vibration and rolling, it has the effect of exhibiting strength and proof strength that do not break.

In addition, according to the roadbed replacement method at the time of railway track switching work according to the present invention, the roadbed ballast of the old line and the new line near the switching point is preliminarily placed in a sandbag as a preparatory work before switching the railway track. Replace with a ballast-filled sandbag filled with crushed stone and bound mouthpiece members.When switching, remove the ballast-filled sandbag, connect a rail and sleeper rail to the new line side, and In the road bed replacement construction method at the time of railroad track switching construction where the ballast is taken out from the entry and restored to the periphery of the railroad , the first string-like material as a yarn in which the plurality of synthetic fiber members are bundled in a flat plate shape is used. a warp member comprising superimposed separately doubly, as the weft members where a plurality of synthetic fiber members comprising overlapping the second string-like material as a yarn bundle in a plate shape separately doubly is alternately Double The woven fabric member made into a substantially rectangular shape is folded at a substantially central position, and the two woven fabric members corresponding to the side portions are sewn together with a thread member, and the two woven fabric members corresponding to the bottom portion are sewn together. A woven fabric member is sewn with a sewing thread member to form a bag body having an upper opening, and a plurality of third string-like materials bundled with a plurality of synthetic fiber members are twisted together in a rope shape to squeeze the upper opening of the bag body. A lace member for closing the upper lip of the bag body is disposed in the lace space formed by folding the upper edge inwardly and sewing together with a sewing thread member in a state of being disposed on the inner side of the upper edge of the upper opening of the bag body. The tensile strength of the cloth member is 1000 N / 5 cm or more according to the test method defined in JIS L 1096-1999, the tensile strength of the mouth strap member is 1000 N / 1 or more according to the test method defined in JIS L 1096-1999, and the front Since the seam has a tensile strength of 1000 N / 1 bag or more according to the test method defined in JIS L 1096-1999, it exhibits strength and proof strength that does not break even when ballast is packed and sufficient vibration rolling is performed. It has the effect. Further, a substantially annular lifting ring portion is formed by the remaining portion of the mouth strap member bound to the ballast-containing clay, and when the ballast-containing soil is removed at the time of the line switching, a plurality of ballast-containing soil cages are suspended. It has the effect that the upper ring part is connected with a wire, and a plurality of ballasts containing ballast can be lifted and removed simultaneously by a construction machine. For this reason, the mechanization of the work of the line switching work is promoted, and there is an effect that the work work is made more efficient and costs are reduced.

  In the embodiment described below, a sandbag for railroad floor floor ballast, a warp member formed by double-stacking a first string-like material obtained by bundling a plurality of synthetic fiber members in a flat plate shape, and a plurality of synthetic fiber members in a flat plate Folded woven fabric members in a substantially rectangular shape so that the weft members formed by doubling the second string-like material bundled in a staggered shape are folded in a substantially rectangular shape and folded to the side A plurality of synthetic fiber members are formed by sewing together two woven fabric members at corresponding locations with a sewing thread member, and sewing the two woven fabric members at locations corresponding to the bottom portion with a sewing thread member to open an upper portion. A cord member for squeezing the upper opening of the bag body and closing the bag by twisting a plurality of third string-like materials bundled together into a rope shape is provided inside the upper edge of the upper opening of the bag body. Fold the upper edge inward in the placed state and sew with a thread member The tensile strength of the woven fabric member is 1000 N / 5 cm or more according to the test method defined in JIS L 1096-1999, and the tensile strength of the lip member is JIS L 1096-1999. Since the test method specified is 1000N / 1 or more, and the tensile strength of the seam is 1000N / 1 bag or more according to the test method specified in JIS L 1096-1999, the roadbed replacement at the time of railway line switching work In the construction method, it is possible to exhibit strength and proof strength that are not damaged even when ballast is packed and sufficient vibration and rolling is performed, and this is the best mode for realizing the present invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing an overall configuration of a railway pouch ballast ballast bag according to a first embodiment of the present invention.

  As shown in FIG. 1, this railroad floor ballast sandbag 10 includes a bag body 11 and a mouth strap member 12. The bag body 11 is a bag made of a woven fabric member 13 and having an upper opening, and a tubular mouth strap formed on the upper portion of the bag body 11 by folding the upper edge 14 of the bag body 11 inside and sewing together with a sewing thread member 15. A space 16 is formed, and the mouth strap member 12 is inserted and arranged in the mouth strap space 16.

  Moreover, one side part (right side part in FIG. 1) 18 of the bag body 11 is folded at a substantially central part with a front part 13a which is a part of the woven fabric member 13 which is folded substantially at the center. The two sides of the back portion 13b, which is the back portion, are sewn together with the sewing thread member 19, whereby the sides are closed.

  Also, the bottom portion 20 is formed by sewing two pieces of the front portion 13a and the back portion 13b of the portion corresponding to the bottom out of the members obtained by sewing the woven fabric member 13 as described above with the sewing thread member 21. Is blocked.

  Next, the manufacturing method of this railroad floor ballast sandbag 10 is demonstrated. FIG. 2 is a diagram for explaining a method for manufacturing a sandbag for railroad floor ballast according to the first embodiment of the present invention.

  First, as shown in FIG. 2 (A), the woven fabric member 13 created in a horizontally long and substantially rectangular shape is folded vertically at a substantially center as indicated by a fold line 13c. Thereafter, the upper edges 13a1 and 13b1 of the woven fabric member 13 are folded inward as indicated by B1 and B2 in the drawing. At this time, the mouth strap member 12 is arranged inside the mouth strap space 16 formed by folding.

  Next, as shown in FIG. 2B, appropriate portions of the folded portion (such as slightly above the upper edge 13a1) are sewn together with the sewing thread member 15. By such sewing, a tubular mouth string space 16 is formed in the upper portion of the bag body 11.

  Next, the side edges 13a2 and 13b2 of the woven fabric member 13 are joined together and folded as indicated by B3 in FIG. 2 (B). Thereafter, although not shown, a portion corresponding to the side portion, that is, an appropriate portion of the folded portion (slightly left side of the right edge 13a2, etc.) is sewn with the sewing thread member 19 (see FIG. 1). At this time, sewing is performed in a substantially vertical direction up to the position indicated by reference numeral 19 in FIG. 1, but the upper portion from the position indicated by reference numeral 19 in FIG. This is for the mouth strap member 12 to squeeze and close the upper opening 11 a of the bag 11. By such sewing, the side part (the right side in the figure) of the bag body 11 is closed.

  Next, the bottom edges 13a3 and 13b3 of the woven fabric member 13 are joined together and folded as indicated by B4 in FIG. 2 (B). Thereafter, although not shown, a portion corresponding to the bottom portion, that is, an appropriate portion of the folded portion (such as slightly above the bottom edge 13a3) is sewn with the sewing thread member 21 (see FIG. 1). By such sewing, the bottom of the bag body 11 is closed.

  As described above, the sandbag 10 for railroad floor ballast can be manufactured.

  Next, the woven fabric member that is the material of the bag body 11 will be described in more detail with reference to FIG.

  3 (A) and 3 (B) show the configuration of a woven fabric member 73 used for a conventional sandbag for reference. As shown in FIGS. 3 (A) and 3 (B), the woven fabric member 73 has a warp member 81 in which a plurality of synthetic fiber members are bundled in a flat plate shape and a plurality of synthetic fiber members in a flat plate shape. It consists of a weft member 82. The warp member 81 and the weft member 82 are woven in a staggered manner. As the synthetic fiber used for the warp member 81 and the weft member 82, polyethylene fiber or the like is used.

  In this case, in FIG. 3A, a number of warp members 81 are woven into a predetermined length portion in the X1 direction (horizontal left and right direction), and a predetermined length portion in the Y1 direction (vertical vertical direction). How many weft and warp yarn members 82 are woven is called “weave density”. In the woven fabric member 73 used in the conventional sandbag, the weave density is, for example, eight warp members 81 are woven into a portion having a length of 2.54 cm in the X1 direction (horizontal left and right direction), and the Y1 direction ( In general, eight weft warp members 82 are woven in a portion of 2.54 centimeters in the vertical direction).

  On the other hand, the structure of the woven fabric member 13 which is a raw material of the bag body 11 of a present Example is shown in FIG.3 (C) and FIG.3 (D). That is, in the woven fabric member 13 of the present embodiment, the first string-like materials 33 and 34 in which a plurality of synthetic fiber members are bundled in a flat plate shape are overlapped to form a warp member 31, and the plurality of synthetic fiber members are formed in a flat plate shape. The second string-like materials 35 and 36 that are bundled together are overlapped to form the weft member 32. The warp member 31 and the weft member 32 are woven in a staggered manner. As the synthetic fiber used for the first string-like materials 33 and 34, polyethylene fiber or the like is used. Moreover, as a synthetic fiber used for the 2nd string-like materials 35 and 36, a polyethylene fiber etc. are used.

  The weaving density of the woven fabric member 13 of this example is such that eight warp members 31 are woven into a length of 2.54 centimeters in the X1 direction (horizontal horizontal direction), and the Y1 direction (vertical vertical direction). Although eight weft and warp yarn members 32 are woven into a portion of 2.54 cm in length, since the warp member 31 is composed of two first string-like materials 33 and 34, the X1 direction ( Since the weaving density of the length of 2.54 cm in the horizontal direction (horizontal direction) is 8 × 2 and 16 pieces, and the weft member 32 is composed of two second string-like materials 35 and 36, The weaving density of the length of 2.54 centimeters in the Y1 direction (vertical vertical direction) is 8 × 2 × 16.

  Next, the intensity | strength of the woven fabric member 13 which is a raw material of the bag body 11 of a present Example is demonstrated. In the woven fabric member 13 of FIG. 1, a portion of a region Z1 that is long in the longitudinal direction with a width L1 (for example, 5 centimeters) is cut out, pulled in the longitudinal direction, and the strength is measured. The test is performed according to the test method defined in JIS L 1096-1999. This test method is also referred to as “JIS L 1096 A method” or “labeled strip method”. As a result of measuring the strength of the woven fabric member 13 of this example by this method, the tensile strength was 1000 Newton (N) / 5 cm or more.

  Further, in the woven fabric member 13 of FIG. 1, a portion of the region Z2 elongated in the lateral direction with a width L2 (for example, 5 centimeters) is cut out, pulled in the longitudinal direction, and the strength is measured. The test is performed according to the test method defined in JIS L 1096-1999. This test method is also referred to as “JIS L 1096 A method” or “labeled strip method”. As a result of measuring the strength of the woven fabric member 13 of this example by this method, the tensile strength was 1000 N / 5 cm or more.

  In addition, the seam was also tested by the test method defined in JIS L 1096-1999 in the same manner as described above, and when converted into one bag for the railroad floor ballast bag 10 of this embodiment, the tensile strength of the seam was 1000 N / 1. More than a bag.

  Next, the mouth strap member 12 will be described in more detail with reference to FIG. As shown in FIG. 1, the mouth strap member 12 is made by twisting three third string-like materials 12a, 12b, and 12c into a rope shape. Each 3rd string material 12a, 12b, 12c is comprised by bundling a plurality of synthetic fiber members. Polyethylene fiber etc. are used as a synthetic fiber used for the 3rd string material 12a, 12b, 12c.

  As a result of conducting a normal tensile strength test on the lace member 12, the tensile strength per one lace member 12 was 1000 Newtons (N) or more. Therefore, the tensile strength was 1000 N / 1 bag or more, assuming that one bag of the sandbag 10 for railroad floor ballast of this example.

  Next, with reference to FIG. 4, a roadbed replacement method at the time of railway track switching work using the sandbag 10 for railroad floor ballast of the present embodiment will be described.

  The railroad bag for railroad floor ballast 10 of the present embodiment has a strength that is much higher than that of a conventional sandbag due to the configuration described above. For this reason, as shown in FIG. 4A, when ballast (gravel or crushed stone) is packed and the mouth is bundled to form a sandbag 115 containing ballast, even if the compaction with the vibration compactor 321 is sufficiently performed, it is damaged. It has the advantage that it does not.

  Moreover, in the sandbag 10 for railroad floor ballast of a present Example, the intensity | strength of the mouth strap member 12 is very strong with 1000N / 1 bag or more. 1000N is about 100 kilogram weight when converted to kilogram unit. The weight of the sandbag with ballast is about 30 kilograms on average. Therefore, in the case of the sandbag 115 containing ballast using the sandbag 10 for the railroad floor ballast of this embodiment, as shown in FIG. 4B, the balance of the mouthpiece member 12 bound to the ballast-containing sandbag 115 is used. A substantially ring-shaped lifting ring portion 40 is formed, and when the ballast-filled sandbag 115 is removed at the time of switching the track, for example, the three ring-shaped sandbag 115 suspension rings 40 are connected by a steel wire 120 to perform construction work. The machines 130 (bulldozers, excavators, cranes, etc.) can lift and remove the plurality of ballasts 115 containing ballast at the same time, and the working time can be greatly reduced compared to the case of conventional manual removal.

  In addition, this invention is not limited to the said Example. The above-described embodiment is an exemplification, and the present invention has the same configuration as the technical idea described in the claims of the present invention, and any device that exhibits the same function and effect is the present embodiment. It is included in the technical scope of the invention.

  For example, the folding process and the sewing process may be performed in an order other than the manufacturing method of the rail bag 10 for railroad floor ballast.

  Further, the woven fabric member may have a weaving density of 2.54 centimeters in the X1 direction (horizontal left-right direction) or more, and the woven fabric member may have a length of 2.54 centimeters in the Y1 direction (vertical vertical direction). The weave density of the portion may be 16 or more.

  In addition, the first string-like material in which a plurality of synthetic fiber members are bundled in a flat plate shape is stacked in a triple layer or more to form a warp member, and the second string material in which a plurality of synthetic fiber members are bundled in a plate shape is stacked in three or more layers. You may make it produce a woven fabric member by making it a weft member and weaving so that this warp member and the weft member 3 may become alternate.

  Further, the synthetic fiber member that is the material of the first string-like material constituting the warp member may be polypropylene fiber, and the synthetic fiber member that is the material of the second string-like material constituting the weft member may be polyethylene fiber. Alternatively, the synthetic fiber member that is a material of the first string-like material constituting the warp member may be polypropylene fiber, and the synthetic fiber member that is the material of the second string-like material constituting the weft member may be polypropylene fiber. This is because sandbags are often lifted vertically in the vertical direction, and warp members are required to have higher strength, and polypropylene fibers have higher strength than polyethylene fibers. However, as a purchase price, polyethylene fiber is cheaper than polypropylene fiber, and in the case of the first embodiment described above, it is considered that both strength and cost are optimal.

  In addition, the lace member may be produced by twisting four or more third string-like materials in which a plurality of synthetic fiber members are bundled into a rope shape.

  In addition, the third string-like material that forms the mouth strap member by twisting may use a synthetic fiber member other than the polyethylene fiber, for example, a polypropylene fiber member.

  The present invention can be implemented in a railway business, a construction industry, or the like that performs railway track switching work, and can be used in these industries. Moreover, it can manufacture in the manufacturing industry which manufactures a sandbag, and can be utilized in these industries.

BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view which shows the whole structure of the sandbag for railroad floor ballasts which is 1st Example of this invention. It is a figure explaining the manufacturing method of the sandbag for railroad floor ballasts of 1st Example of this invention. It is a figure explaining the structure of the woven fabric member used as the material of the sandbag for railroad floor ballasts of 1st Example of this invention. It is a figure explaining the roadbed replacement construction method at the time of railroad track change construction using the sandbag for railroad floor ballasts of the 1st example of the present invention. It is a figure explaining the conventional railroad track switching construction. It is a figure explaining the conventional railroad track switching construction and a roadbed replacement construction method. It is a figure explaining the problem in the roadbed replacement construction method at the time of the conventional railway track change construction.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Railroad floor ballast sandbag 11 Bag body 11a Upper opening 12 Tie member 12a-12c 3rd string member 13 Woven fabric member 13a Front part 13a1 Upper edge 13a2 Side edge 13a3 Bottom edge 13b Back part 13b1 Upper edge 13b2 Side edge 13b3 Bottom edge 13c Folding line 14 Upper edge 15 Sewing member 16 Closure space 18 Side portion 19 Sewing member 20 Bottom 21 Sewing member 31 Warp member 32 Weft member 33, 34 First string member 35, 36 Second string member 40 Suspended Upper ring portion 73 Woven fabric member 81 Warp yarn member 82 Weft member 115 Ballasted clay 120 Steel wire 130 Construction machine 301-303 Railroad track 304 River 305-307 Bridge 308-311 Switching point 315 Ballasted clay 320 Worker 321 Vibration compactor B1- B4 Bending process

Claims (3)

A plurality of synthetic fiber members warp member comprising a first string-like material as a yarn bundle in a plate shape overlapping separately double, second string-like multiple synthetic fiber members as yarn bundle tabular Folded woven fabric members made in a substantially rectangular shape so that the weft members made of two separate layers of material are staggered, folded in a substantially rectangular shape, and two pieces corresponding to the sides The woven fabric member is stitched together with a sewing thread member, and the two woven fabric members corresponding to the bottom portion are sewn together with the sewing thread member to form a bag body having an open top, and a third string in which a plurality of synthetic fiber members are bundled In the state where the lace member for squeezing the upper opening of the bag body to close the bag by twisting a plurality of strip-like materials into a rope shape is arranged inside the upper edge of the upper opening of the bag body A lanyard formed by folding the edge inward and stitching together with a thread member The tensile strength of the woven fabric member is 1000 N / 5 cm or more according to a test method defined in JIS L 1096-1999, and the tensile strength of the mouth strap member is 1000 N / in according to a test method defined in JIS L 1096-1999. A sandbag for railroad floor ballast characterized in that it has one or more and the tensile strength of the seam is 1000 N / 1 bags or more by the test method defined in JIS L 1096-1999. For railroad track switching work, as preparatory work before switching, replace the old and new roadbed ballast near the switching point with a ballasted sandbag in which crushed stones are packed in a sandbag and the mouth strap members are bound together, At the time of switching, when the railway track is switched, the ballast containing the ballast is removed, the rail made of rails and sleepers is connected to the new line, and the ballast is removed from the ballasted soil and restored to the periphery of the rail. In the road bed replacement method of
The sandbag is
A plurality of synthetic fiber members warp member comprising a first string-like material as a yarn bundle in a plate shape overlapping separately double, second string-like multiple synthetic fiber members as yarn bundle tabular Folded woven fabric members made in a substantially rectangular shape so that the weft members made of two separate layers of material are staggered, folded in a substantially rectangular shape, and two pieces corresponding to the sides The woven fabric member is stitched together with a sewing thread member, and the two woven fabric members corresponding to the bottom portion are sewn together with the sewing thread member to form a bag body having an open top, and a third string in which a plurality of synthetic fiber members are bundled In the state where the lace member for squeezing the upper opening of the bag body to close the bag by twisting a plurality of strip-like materials into a rope shape is arranged inside the upper edge of the upper opening of the bag body A lanyard formed by folding the edge inward and stitching together with a thread member The tensile strength of the woven fabric member is 1000 N / 5 cm or more according to a test method defined in JIS L 1096-1999, and the tensile strength of the mouth strap member is 1000 N / in according to a test method defined in JIS L 1096-1999. A road bed replacement method at the time of railroad track switching construction, characterized in that it is configured so that one or more and the tensile strength of the seam is 1000 N / 1 bags or more by the test method defined in JIS L 1096-1999. In the road bed replacement method at the time of railway track switching construction according to claim 2 ,
A substantially annular lifting ring portion is formed by the remaining portion of the mouth strap member bound to the ballast-containing clay, and when the ballast-containing soil is removed at the time of the line switching, a plurality of ballast-containing soil-lifting rings. A roadbed replacement method at the time of railroad track switching construction, in which a plurality of ballasts containing ballast are simultaneously lifted and removed by a construction machine.

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