JP2008138465A - Repair method for bedded track and repair material filling device used therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provided a ballasted track repairing method for repairing a ballasted track in which sleepers are supported by ballast, wherein the method eliminates separation of a material which is a mixture of cement and a granular material prepared beforehand, and effectively repairs the track even if the ballast has a high mixture ratio of fine-grained soil. <P>SOLUTION: The ballasted track repairing method is applicable to the ballasted track in which the sleepers 3 are supported by the ballast 2. In the method, the cement 5, the granular material 6, and water 7 are fed separately from each other into a gap between the ballast 2 and the sleeper 3, and the cement 5, the granular material 6, and the water 7 are mixed together under the sleepers 3. Specifically the cement 5 and the granular material 6 are mixed together before mixture with the water 7, and thereafter the water 7 is mixed into the mixed cement and granular material. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention repairs a track by filling a gap generated under the sleeper with a repair material when a subsidence occurs on the road bed or a roadbed supporting the bed bed in a bedded track with a sleeper supported by the road bed. The present invention relates to a repair method for a bedded floor track and a repair material filling device used therefor.

  In a bedded track with a sleeper supported on the ballast, when the subsidence occurs on the roadbed or the roadbed that supports the roadbed due to repeated wheel loads, the sleeper or the bed layer on which the sleeper directly rests Since a gap is generated between the roadbed and the roadbed, it is necessary to fill this gap. The subsidence of the roadbed occurs when the soil particles constituting the roadbed lose shear strength and cause slipping, and the smaller the soil particles (the higher the fine soil contamination rate), the more likely it is to occur.

  Normally, the gap is filled with crushed stone, concrete, etc., but since the gap cannot be completely blocked, the packed bed may flow out through the water channel during aquifer, and the generation of voids is repeated. Therefore, it is not an effective repair method.

  On the other hand, the applicant applies a method of forming a roadbed surface protective layer on the roadbed by filling the gap with a high plastic material such as bentonite and filling with cement asphalt mortar, and forming a void filling layer thereon. Has been proposed previously (see Patent Document 1). In this method, bentonite coats the sand in the roadbed facing the voids to give the sand shear strength, prevent the void surface from collapsing, and prevent the void growth in combination with the roadbed surface protective layer. (Paragraphs 0013 to 0016).

JP 2005-344475 A (Claim 2, paragraphs 0012 to 0016, FIG. 1)

  Patent Document 1 is a method of preventing outflow of roadbed soil by forming a roadbed surface protective layer and preventing the growth of voids by forming a void-filling layer. However, the adhesive strength of bentonite imparts sufficient strength to sand. It is difficult to say that it is an effective method for preventing orbital settlement. Actually, when bentonite-coated sand was used in the method described in Patent Document 1 to repair a track with a high mixing rate of fine-grained soil to the roadbed, strength could not be imparted to the sand in the roadbed, and the track subsidence occurred. It has been found that it does not lead to an effect of preventing the long-term. This is probably because bentonite itself has no caking property.

  Therefore, if cement is used instead of bentonite, it is assumed that the sand filled under the sleeper is consolidated, so that long-term durability can be imparted to the sand. However, for example, if sand, cement, and water are mixed and filled under the sleeper in a slurry state, the slurry cannot support the track unless it is solidified. You must wait for the curing time to elapse. Therefore, it is difficult to complete the construction within a short time by using the train interval, and there is a high risk when poor curing occurs.

  It is also possible to inject water after filling the sleeper while mixing dry sand and cement through a transfer tube. According to this method, it is possible to support the track sufficiently with only the shear strength of the sand particles until the cement hardens, so the work can be performed safely even in a short time between trains. Can do.

  However, since the mixture of sand and cement powder with different particle shape and specific gravity is easy to separate and unevenness in the mixing ratio is likely to occur during pressure feeding in the transfer pipe, the mixture is pneumatically maintained while maintaining a uniform mixing ratio. It is difficult to pump by. Even if the mixture is mixed before pumping in the transfer pipe, there is no change in unevenness during pumping.

  In Patent Document 1, these problems are solved by coating (attaching) bentonite powder on the surface of sand particles, but water is indispensable for coating, and if water is used, cement is mixed with water. At some point, it may undergo a hydration reaction and begin to cure alone before being mixed with the sand. In this case, a sufficient shear strength cannot be exerted on the mixture of the sand and cement after filling. Even if water is sprayed after the sand and cement are filled in a dry state, it is difficult to completely infiltrate the water into the mixture of sand and cement.

  In view of the above background, the present invention proposes a method for repairing a roadbed track that can effectively repair a track even in a roadbed with a high mixing rate of fine-grained soil, and a repair material filling device used therefor.

  According to a first aspect of the present invention, there is provided a method for repairing a bedded track, wherein a cement, a granular material, and water are separately provided between the bedbed and the sleeper. Feeding and mixing the cement, granule and water under the sleeper is a constituent requirement. Sand is mainly used for the granular material, but includes all materials that exhibit the same strength as sand by consolidation. The solidified body, which is a mixture of cement, granular material, and water, becomes a repair material that fills the voids generated under the sleepers.

  Cement, granules, and water are separately fed between the roadbed and the sleeper, so that the cement and granules are mixed under the sleeper. Since cement reacts with water in this mixture to form a solid, differences in particle shape, specific gravity, etc., such as when cement and granules are pumped under sleepers in a premixed state No material separation due to

  Further, the cement and the granular material are mixed with water at the time of filling under the sleeper or immediately before the filling, so that the cement can cause a hydration reaction at the same time or almost simultaneously with the mixing with the granular material. For this reason, the problem of poor curing and insufficient strength due to the cement undergoing a hydration reaction and solidifying before the cement is mixed with the granular material is solved.

  At the same time as the cement is mixed with the granular material, it reacts with water under the sleeper to form a consolidated body, so that the consolidated body becomes a part of the road bed and supports the sleeper together with the crushed stone constituting the road bed. Demonstrate ability. In claim 1, the fine soil in the road bed is not consolidated by cement and water, but the space is repaired by filling and solidifying the repair material, so that the track is effective regardless of the level of fine soil contamination. Can be repaired automatically.

  Since cement causes a hydration reaction when mixed with water, it is appropriate that cement is sufficiently mixed with the granule before mixing with water to ensure the strength of the granule. . Also, under sleepers, if the cement, granule and water are mixed at the same time, the water will not necessarily spread evenly throughout the cement and granule mixture. There is a possibility of separation from the granular material.

  Therefore, since the cement and the granular material are mixed before mixing with water and then mixed with water as described in claim 2, separation of the cement and the granular material is avoided as much as possible. When filled, the mixture of both can be consolidated in a state where the cement and the granular material are integrated.

  Since the cement, the granular material, and water are mixed at the time of filling under the sleeper or immediately before the filling, it is assumed that it takes time until the cement and the granular material are consolidated in an integrated state. On the other hand, as described in claim 3, under the sleeper, the cement and the granule previously mixed are sprayed toward the lower sleeper, and the cement is integrated with the granule by spraying water. It becomes possible to consolidate early in the state. When the water is jetted, the mixture does not become a slurry state, so that it does not take several days to one month to consolidate, and the consolidation of the mixture can be accelerated.

  The method according to claim 2 or 3 is performed by the repair material filling apparatus according to claim 4.

  The repair material filling device is connected to a cement tank, a granule tank, and a water tank for storing cement, granule, and water, respectively, and supplies the cement, granule, and water under the sleeper. A pipe, a granular material transfer pipe, and a water transfer pipe are provided, and the cement transfer pipe and the granular material transfer pipe merge together before one of the tips, and are unified. The cement transfer pipe and the granular material transfer pipe are merged before one of the tips, and are unified so that the cement and the granular material can be mixed before mixing with water and then mixed with water. This is done, and the mixture of the two is consolidated in a state where the cement and the granular material are sufficiently mixed.

  Since cement, granule, and water are separately fed between the roadbed and the sleeper, separation of materials as in the case where cement and granule are premixed can be eliminated. Also, since cement and granule are mixed with water at the time of filling under sleeper or just before filling, the problem of poor curing and insufficient strength due to solidification before cement is mixed with granule is also solved. be able to.

  In order to repair the track by sending cement and granular material and water separately under the sleeper and forming a consolidated body that is a mixture of these under the sleeper, regardless of the level of fine soil contamination, The track can be repaired effectively.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.

  In FIG. 1, in a bedded track where a sleeper 3 is supported on a roadbed 2 such as ballast, cement 5, granular materials 6 such as sand, and water 7 are individually fed between the bedbed 2 and the sleepers 3. The construction point of the repair method of the roadbed track | orbit which mixes the cement 5, the granular material 6, and the water 7 under the sleeper 3 is shown. The road bed 2 is supported by the roadbed 1, and a rail 4 is fixed on the sleeper 3.

  FIG. 1 also illustrates the use of the repair material filling device 8 used in this method, in which the cement 1, the granular material 6, and the water 7 are filled into the void generated between the road bed 2 and the sleeper 3 while mixing. Shows the situation.

  The repair material filling device 8 is connected to the cement tank 9, the granule tank 10, and the water tank 11 that respectively store the cement 5, the granular material 6, and the water 7, and the cement 5, the granular material 6, and the water 7. A cement transfer pipe 12, a granular material transfer pipe 13, and a water transfer pipe 14 are provided below the sleeper 3. Either one of the cement transfer pipe 12 and the granular material transfer pipe 13 merges before the other end to be unified. In FIG. 1, the tip of the cement transfer pipe 12 is connected to the middle of the granular material transfer pipe 13 and merges with the granular material transfer pipe 13.

  Compressed air is supplied to the cement tank 9, the granular material tank 10, and the water tank 11 from a compressor 15 through a hose 16 connected thereto. Air exists in the cement tank 9, the granular material tank 10, and the water tank 11, and the compressed air is fed into the air, so that the cement 5, the granular material 6, and the water 7 are transferred from the cement transfer pipe 12 and the granular material, respectively. It is discharged into the transfer pipe 13 and the water transfer pipe 14.

  The pressure of the compressed air is adjusted by a pressure regulating valve 17 connected to each hose 16, but in order to prevent a loss of pressure until the cement 5 or the like is supplied below the sleeper 3, The length of each transfer pipe 12, 13, 14 is suitably 1 to several meters.

  The water transfer pipe 14 is laid to the bottom of the sleeper 3 independently of the cement transfer pipe 12 and the granular material transfer pipe 13. Although the cement transfer pipe 12 and the granular material transfer pipe 13 can be installed under the sleeper 3 independently of each other, in FIG. 1, before the cement 5 reacts with the water 7 and solidifies, The tip of the cement transfer pipe 12 is connected to the middle of the granular material transfer pipe 13 so that the granular material 6 is not separated, and the two transfer pipes 12 and 13 are unified.

  The cement transfer pipe 12 and the granular material transfer pipe 13 merge before the tip of the water transfer pipe 14, so that the cement 5 and the granular material 6 are mixed before mixing with the water 7, and then mixed with the water 7. Will be. The distance from the location where the cement transfer pipe 12 joins the granular material transfer pipe 13 to the tip of the granular material transfer pipe 13 is ensured to be large enough to allow the cement 5 and the granular material 6 to be sufficiently mixed. About 2 m is appropriate.

  As shown in FIG. 1, the tip end of the granular material transfer pipe 13 and the tip end of the water transfer pipe 14 are inserted into a gap formed under the sleeper 3. FIG. 2 shows an enlarged view of the tip portion of each of the transfer pipes 13 and 14. FIG. 2 particularly shows the positional relationship between the tip of the granular material transfer tube 13 and the tip of the water transfer tube 14. Nozzles 13a and 14a for ejecting the mixture of cement 5 and granule 6 and water 7 are connected to the tip of granular material transfer pipe 13 and the tip of water transfer pipe 14, respectively.

  When the mixture of the cement 5 and the granular material 6 ejected from the tip of the granular material transfer pipe 13 and the water 7 ejected from the distal end of the water transfer pipe 14 are mixed under the sleeper 3, each of the transfer pipes 13. The positional relationship of the 14 tips is not questioned.

  However, immediately after the water 7 hits the front of the tip of the granular material transfer pipe 13 and the water 7 adheres around the nozzle 13a and is ejected from the nozzle 13a, the mixture of the cement 5 and the granular material 6 becomes a lump state, Unevenness can occur in the mixture. Therefore, in FIG. 2, the tip of the granular material transfer pipe 13 is moved backward from the tip of the water transfer pipe 14 so that the mixture of the cement 5 and the granular material 6 is ejected into the ejected water 7.

  The cement 5 and the granular material 6 do not necessarily have to be mixed evenly as a whole, and a solidified body formed by mixing water with the mixture as described later is assumed to be crushed. There is no problem even if a portion with a high strength and a portion with a small strength are mixed in the combined body.

  The mixing ratio of water 7 and cement 5 is determined in consideration of the strength before and after curing, but from the aspect of supporting ability after the mixture is cured under sleeper 3 and becomes a consolidated body, 3: 1 to A range of about 2: 1 is optimal. If it is in this range, the solidified body of the mixture will break to an appropriate size, for example, the size of the ballast constituting the road bed 2 by the impact from vibration from the sleeper 3, and support the sleeper 3 together with the ballast. Will be able to. FIG. 3 shows a change in the amount of settlement due to the difference in the addition rate when a quick-hardening cement is used as the cement 5.

  As shown in FIG. 3, it can be seen that the effect of suppressing the settlement of the sleeper 3 appears from the range where the addition rate of the cement 5 exceeds 20%. From the slope of the curve from 20% to 40% addition rate, about 40% to 50% is considered to be an ideal addition amount. An addition rate of 0 is when only sand is filled.

  The amount of water 7 added is also adjusted according to the state of the orbit where the mixture is filled, but the amount of water 7 after being ejected from the water transfer pipe 14 is set so as to satisfy the target water cement ratio. .

  As the cement 5, in addition to ordinary Portland cement, early strength or very early strength cement or the like is used, and an admixture or an admixture may be added.

  A solidified product obtained by mixing a mixture of cement 5 and granular material 6 with water 7 and curing has sufficient compressive strength and shear strength, but has low bending and tensile strength. By receiving a bending or tensile force between 3 and the ballast, it is cracked or crushed to an appropriate size. As a result, the ballast is crushed to the size of the ballast (crushed stone), and thus functions as a ballast. Therefore, it is possible to perform additional repair (correction) with a tie tamper, as in a normal ballast track where no consolidated body exists under the sleeper 3.

It is the elevation which showed the construction point of the repair method of the roadbed track which used repair material filling device. FIG. 2 is a partially enlarged view of FIG. 1 showing the positional relationship between the tip of a granular material transfer tube and the tip of a water transfer tube. It is the graph which showed the relationship between the addition rate of cement, and the amount of settlement of sleepers when a quick-hardening cement is used.

Explanation of symbols

1 ……… Roadbed 2 ………… Roadbed 3 ……… Sleeping 4 ……… Rail 5 ……… Cement 6 ……… Granular material 7 ……… Water 8 ……… Repairing material filling device 9 ……… Cement Tank 10 ... Granular tank 11 ... Water tank 12 ... Cement transfer pipe 13 ... Granular transfer pipe 13a ... Nozzle 14 ... Water transfer pipe 14a ... Nozzle 15 ... Compressor 16 ... Hose 17 ... Pressure adjustment valve

Claims (4)

  In a bedded track with a sleeper supported by a roadbed, cement, granules, and water are individually fed between the roadbed and the sleepers, and the cement, granules, and water are placed under the sleepers. A method for repairing a bedrock track characterized by mixing.   The method for repairing a bedded track according to claim 1, wherein the cement and the granular material are mixed before mixing with water and then mixed with water.   The method for repairing a bedded floor track according to claim 2, wherein the cement and the granular material mixed in advance are sprayed and water is sprayed under the sleeper. It is a repair material filling device used in the method according to claim 2 or claim 3, and is connected to each of a cement tank, a granular material tank, and a water tank for storing cement, granular material, and water, respectively. A cement transfer pipe for supplying the cement, granule, and water under the sleeper, a granule transfer pipe, and a water transfer pipe, and the cement transfer pipe and the granule transfer pipe are in front of one of the tips. A repair material filling device characterized by merging and unifying.

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