JP2008069526A - Sleeper for railroad - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sleeper for a railroad, which can prevent a sleeper body from undergoing shrinkage and deflection deformation in the molding of the sleeper body, even if the sleeper body is molded from a synthetic resin, and which can ensure the strength of mounting a fastener on the sleeper body, without complicating manufacturing operations. <P>SOLUTION: A plurality of hollow portions 14-19, both the ends 14a-19a of which are each opened on both the mutually opposed end surfaces 11b of the sleeper body 11 and which continuously pass though the sleeper in the longitudinal direction of the sleeper 11, are formed in the sleeper body 11 which is composed of a synthetic resin material. A filler 24, which allows the entry of a portion 30a, protruding into the respective hollow portions 14 and 15, of the fastener 30 mounted on the sleeper body, is infilled into portions 14b and 15b, corresponding to positions to arrange respective rails R on the sleeper body 11, of the respective hollow portions 14 and 15 among the plurality of hollow portions 14-19, so that the rails R can be each fixed to the sleeper body 11. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a railroad sleeper for dispersing a load that a rail receives from a train.

  Conventionally, a railroad sleeper having a columnar sleeper body made of a synthetic resin material is known as a railroad sleeper (see, for example, Patent Document 1).

  According to this railroad sleeper, since the sleeper body is made of synthetic resin, the sleeper body is less likely to be corroded and damaged than when the sleeper body is made of wood, and the sleeper body is made of concrete. The weight of the sleeper body is lighter than that of the sleeper, so that the sleeper body is likely to be corroded and damaged, resulting in a decrease in the service life of the sleeper body and a heavy sleeper body in terms of efficiency of laying the sleeper body. Is prevented.

  When manufacturing such a railway sleeper, for example, the synthetic resin material that becomes the sleeper body is melted by heating, the molten synthetic resin material is poured into a molding die, and then the synthetic resin material is cooled. To solidify. Thereby, the sleeper main body is manufactured.

  However, when manufacturing the sleeper body, the molten resin is cooled only from its outer surface when cooled to solidify the molten resin that becomes the sleeper body, so the shrinkage rate of the outer periphery of the sleeper body and the shrinkage rate inside A large difference is generated between the two, and the molded sleeper body is distorted, so-called sink marks, and the like. For this reason, a fall of dimensional accuracy is caused to a sleeper main body.

Therefore, in order to prevent distortion and sink marks at the time of forming the sleeper body, a hollow part that penetrates the sleeper body continuously in the longitudinal direction or a plurality of hollow parts that penetrate in the width direction is formed in the sleeper body. It is possible. According to this, when cooled to solidify the molten resin that becomes the sleeper body, the sleeper body is cooled from the outer surface and the inner surface of the hollow part, so that the sleeper body is different from the sleeper body in which the hollow part is not formed. It is possible to prevent a large difference from occurring between the shrinkage rate of the outer peripheral portion and the shrinkage rate inside. This prevents distortion, sink marks, etc. from occurring in the sleeper body, which is a molded product, when the molten resin is cooled, thus preventing reduction in the dimensional accuracy of the sleeper body due to distortion, sink marks, etc. in the sleeper body. can do.
JP-A-06-41901

  However, since a thin part is formed between the peripheral surface of the sleeper body and the hollow part by forming a hollow part in the sleeper body, a fastener such as a bolt for fixing the rail to the sleeper body is used. When driven into the peripheral surface of the main body, the fastener passes through the thin-walled portion and partially projects into the hollow portion. For this reason, the portion held by the sleeper body of the fastener is smaller than when the fastener is driven so as to be entirely embedded in the sleeper body without partially protruding into the hollow portion. The attachment strength of the fastener to the sleeper body against the force is reduced.

  In order to secure the attachment strength of the fastener to the sleeper body, for example, a reinforcing member is provided between the rail and the sleeper body on the peripheral surface of the sleeper body, and the fastener is driven into the sleeper body via the reinforcing member. For example, in order to ensure that the reinforcing member is prevented from being detached from the sleeper body due to the force received from the rail, for example, the reinforcing member is fused to the sleeper body in order to secure the bonding strength of the reinforcing plate to the sleeper body. Therefore, it is necessary to join the sleeper body integrally. For this reason, the reinforcement work of railroad sleepers becomes complicated.

  Therefore, the present invention can prevent sink marks and bending deformation from occurring in the sleeper main body during molding of the sleeper main body, and ensure the attachment strength of the fastener to the sleeper main body without incurring troublesome reinforcement work. The purpose is to provide railway sleepers that can be used.

  In order to solve the above problems, the invention according to claim 1 is a railroad sleeper including a sleeper body made of a synthetic resin material, and both ends of the sleeper body are opposite to each other of the sleeper body. At least one hollow portion that is open to the surface and continuously penetrates the sleeper main body in the longitudinal direction or the width direction is formed, and corresponds to the arrangement position of the pair of rails on the sleeper main body of the hollow portion The interior of the portion is filled with a filling material into which the protruding portion into the hollow portion of the fastener attached to the sleeper body is fixed to fix each rail to the sleeper body. .

  The invention according to claim 2 is characterized in that, in the invention according to claim 1, the filler is made of a synthetic resin material and is filled in the portion of the hollow portion after the sleeper body is molded. To do.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the filler is injected into the portion of the hollow portion in a state having fluidity, and then the portion is filled in the portion. The hollow portion is provided with an outflow prevention means for preventing the filling material from flowing out from the inside of the hollow portion.

  According to a fourth aspect of the present invention, in the third aspect of the present invention, the outflow prevention means is arranged to be spaced apart from each other in the extending direction of the hollow portion and to sandwich the portion of the hollow portion. And the filler is injected between the plate members.

  The invention according to claim 5 is the invention according to claim 3, wherein the outflow prevention means is a pair of air bags that are inflated by injecting air, and the air bags close the inside of the hollow portion. In the inflated state, the hollow portions are arranged so as to be spaced apart from each other in the extending direction of the hollow portion and sandwich the portion of the hollow portion, and the filler is injected between the air bags. .

  The invention according to claim 6 is the invention according to claim 3, wherein the outflow prevention means is an air bag that expands by injecting air, and the air bag closes the inside of the hollow portion. It is arranged in the portion of the hollow part in an expanded state, and the filling is injected into the air bag.

  The invention according to claim 7 is a pillar-shaped sleeper main body made of a synthetic resin material, and both ends are opened to opposite end surfaces of the sleeper main body, and the sleeper main body is continuous in the longitudinal direction or the width direction. A railroad sleeper manufacturing method comprising a sleeper body having at least one hollow portion formed therethrough, and after forming the sleeper body with the hollow portion formed therein, a pair of the hollow portion to the sleeper body Filling the inside of the portion corresponding to the position of the rail of the rail into which the protruding portion into the hollow portion of the fastener attached to the sleeper body is fixed to fix each rail to the sleeper body. Features.

  The invention according to claim 8 is the invention according to claim 7, wherein the filler is made of a synthetic resin material mixed with a foaming agent, and the filler has fluidity in a state where the filler has fluidity. Is injected into the portion of the hollow portion, and then the filler is foamed to fill the portion of the hollow portion.

  According to a ninth aspect of the invention, in the eighth aspect of the invention, when the filler is injected into the portion of the hollow portion, the filler flows out of the portion to the outside. An outflow prevention means for preventing is provided in the hollow portion.

  The invention according to claim 10 is the invention according to claim 9, wherein the outflow prevention means is a pair of plate members, and is spaced from each other in the extending direction of the hollow portion and sandwiches the portion of the hollow portion. Cuts are formed in the sleeper main body at each position, the plate members are inserted into the hollow portions through the cuts, and injection holes are formed in the sleeper main body to open between the plate members. The filler is injected between the plate members through holes.

  The invention according to claim 11 is the invention according to claim 9, wherein the outflow prevention means is a pair of air bags inflated by injecting air, and is spaced from each other in the extending direction of the hollow portion. An insertion hole is formed in the sleeper body so as to open in the portion of the hollow portion at a position sandwiching the portion of the hollow portion, and the air bags are inserted into the insertion holes in a non-inflated state. The air bag is inflated to a size such that the inside of the hollow portion is closed by injecting air into the air bag through the insertion holes, and in the sleeper body. An injection hole opened between the air bags is formed, and the filler is injected between the air bags through the injection holes.

  The invention described in claim 12 is the invention described in claim 9, wherein the outflow prevention means is an air bag that is inflated by injecting air, and the sleeper body opens into the portion of the hollow portion. An insertion hole is formed, and the air bag is inserted into the insertion hole in a non-inflated state to be disposed in the portion of the hollow portion, and air is injected into the air bag through the insertion hole. The air bag is expanded to a size that allows the inside of the hollow portion to be closed, and the filler is injected into the air bag through the insertion hole.

  According to invention of Claim 1, since a sleeper main body consists of a synthetic resin material, compared with the case where a sleeper main body is wooden, it is hard to generate | occur | produce corrosion and damage to a sleeper main body, Moreover, a sleeper main body is made from concrete. Since the weight of the sleeper body is lighter than that of the conventional case, the sleeper body is reduced in the service life of the sleeper body due to the fact that the sleeper body is easily corroded and damaged, and the sleeper body is heavy. It is possible to reliably prevent a reduction in the efficiency of laying work.

  Further, the sleeper body is formed with at least one hollow portion that continuously penetrates the sleeper body in the longitudinal direction or the width direction, and both ends of the hollow portion are open to both end surfaces of the sleeper body that face each other. Therefore, when the molten resin material that becomes the sleeper main body is cooled when the sleeper main body is molded, the sleeper main body can be cooled entirely from the outer surface and the inner surface of the hollow portion. This prevents a large difference between the shrinkage ratio of the outer periphery of the sleeper body and the shrinkage ratio inside, so that when the molten resin material is cooled, conventional distortion or so-called sink marks are formed. It is prevented from occurring in the sleeper body that is a product. Therefore, it is possible to reliably prevent the conventional dimensional accuracy of the sleeper body from being lowered due to distortion, sink marks and the like occurring in the sleeper body.

  Furthermore, inside the portion corresponding to the arrangement position of the pair of rails on the sleeper main body of the hollow portion, each rail is fixed to the sleeper main body so that the fasteners attached to the sleeper main body protrude into the hollow portion. Since the filling into which the portion enters is filled, for example, when a fastener such as a nail is driven into the circumferential surface of the sleeper body, the hollow surface and the hollow portion of the sleeper body are formed by forming a hollow portion in the sleeper body. Even if the fastener penetrates through the thin-walled portion formed between the two portions and protrudes partially into the portion of the hollow portion, the protruding portion is driven into the filling filled in the portion of the hollow portion. Can do. Thereby, since a fastener can be entirely embedded in a sleeper main body and a filler, without making a hollow part protrude partially in a hollow part, a fastener can be hold | maintained entirely with a sleeper main body and a filler. Thereby, when an external force is applied to the fastener in a direction in which the fastener is pulled out from the sleeper body, the external force is received as a compressive force for compressing the filler with the filler. Therefore, it is possible to surely prevent a decrease in the attachment strength of the fastener to the sleeper body against a pulling force as in the conventional case due to the fastener partially protruding into the hollow portion.

  In addition, since the filler can be integrally fixed to the sleeper body in the portion by filling the filler in the portion of the hollow portion, in order to ensure the attachment strength of the fastener to the sleeper body There is no need to perform a joining operation as in the case where a reinforcing member is provided between the rail and the sleeper body on the peripheral surface of the sleeper body. Thereby, the reinforcement work of a railroad sleeper can be easily performed compared with the case where the said reinforcement member is provided in a sleeper main body.

  Furthermore, since the hollow part is formed in the sleeper main body, the amount of the synthetic resin material required to form the sleeper main body compared to the case where the sleeper main body is solid without forming the hollow part. Therefore, it is possible to reliably reduce the manufacturing cost of the sleeper body and reduce the weight of the sleeper body.

  According to the second aspect of the present invention, the filler is made of a synthetic resin material, and is filled in the portion of the hollow portion after the sleeper body is molded. For example, the filler is filled in the portion of the hollow portion. By filling the sleeper body when the sleeper body is molded, it is possible to reliably prevent the filler from interfering with cooling from the inside of the sleeper body.

  According to the invention described in claim 3, the filler is cured in the portion after being injected into the portion of the hollow portion in a fluid state.

  When the filler is provided in the hollow portion in a solid state, the cross-sectional area of the filler needs to be smaller than the cross-sectional area of the hollow portion so that the filler can be smoothly inserted into the hollow portion. . For this reason, there exists a possibility that a big clearance gap may be formed between a filler and the surrounding surface of a hollow part in the state by which the filler is arrange | positioned in the said part of a hollow part. If a large gap is formed between the filling and the peripheral surface of the hollow portion, the filling cannot be fixed integrally with the sleeper body in the hollow portion, and the filling moves in the hollow portion. The fastener cannot be properly driven into the filling.

  On the other hand, according to the present invention, as described above, since it is injected into the portion of the hollow portion in a state having fluidity and then cured in the portion, the filling material is put into the hollow portion. It is not necessary to make the cross-sectional area of the filler smaller than the cross-sectional area of the hollow portion for smooth insertion. This prevents a large gap from being formed between the hardened filler and the peripheral surface of the hollow part, so that the filler can be added to the filler as in the case of inserting the filler into the hollow part in a solid state. It is possible to reliably prevent the fastening failure of the fastener.

  In addition, since the outflow prevention means is provided in the hollow portion to prevent the filling material from flowing out from the inside of the portion, the filling material having fluidity is disposed outside the portion of the hollow portion. It is possible to reliably prevent a filling failure of the filling material into the portion due to outflow. Thereby, it can prevent reliably that the holding | maintenance effect | action of the fastener by a filler reduces by the filling defect of the filler in the said part of a hollow part reducing.

  According to the invention described in claim 4, the outflow prevention means is a pair of plate members arranged so as to be spaced apart from each other in the extending direction of the hollow portion and sandwich the portion of the hollow portion. Since the filling material injected between the plate members is blocked by the plate members, the filling material is blocked from between the plate members, that is, outside the portion of the hollow portion. Can be reliably prevented from flowing out.

  According to the invention described in claim 5, the outflow prevention means is a pair of air bags inflated by injecting air, and each air bag is inflated so as to close the inside of the hollow portion. Since the filling material is injected between the air bags, the filling material injected between the air bags is separated by each air bag. Since it is blocked, it is possible to reliably prevent the filler from flowing out between the air bags, that is, outside the portion of the hollow portion.

  According to the sixth aspect of the present invention, the outflow prevention means is an air bag that is inflated by injecting air, and the air bag is inflated so as to close the inside of the hollow portion. Since the filling material is injected into the air bag, the filling material is retained in the hollow portion by injecting the filling material into the air bag disposed in the hollow portion. can do. Thereby, it can prevent reliably that a filler flows out of the said part of a hollow part.

  According to the invention of claim 7, since the sleeper body is made of a synthetic resin material, the sleeper body is less likely to be corroded and damaged than the sleeper body is made of wood, and the sleeper body is made of concrete. Since the weight of the sleeper body is lighter than that of the conventional case, the sleeper body is reduced in the service life of the sleeper body due to the fact that the sleeper body is easily corroded and damaged, and the sleeper body is heavy. It is possible to reliably prevent a reduction in the efficiency of laying work.

  Further, the sleeper body is formed with at least one hollow portion that continuously penetrates the sleeper body in the longitudinal direction or the width direction, and both ends of the hollow portion are open to both end surfaces of the sleeper body that face each other. Therefore, when the molten resin material that becomes the sleeper main body is cooled when the sleeper main body is molded, the sleeper main body can be cooled entirely from the outer surface and the inner surface of the hollow portion. This prevents a large difference between the shrinkage ratio of the outer periphery of the sleeper body and the shrinkage ratio inside, so that when the molten resin material is cooled, conventional distortion or so-called sink marks are formed. It is prevented from occurring in the sleeper body that is a product. Therefore, it is possible to reliably prevent the conventional dimensional accuracy of the sleeper body from being lowered due to distortion, sink marks and the like occurring in the sleeper body.

  Furthermore, when manufacturing a railroad sleeper, after forming the sleeper body, the rails are respectively fixed to the sleeper body inside the portion corresponding to the arrangement position of the pair of rails to the sleeper body of the hollow portion. Since the filling part into which the protruding part into the hollow part of the fastener attached to the sleeper body enters is filled, for example, when a fastener such as a nail is driven into the peripheral surface of the sleeper body, the hollow part into the sleeper body Even if the fastener partially protrudes into the portion of the hollow portion through the thin wall portion formed between the peripheral surface of the sleeper body and the hollow portion by forming the protruding portion, the protruding portion of the hollow portion The filling material filled in the part can be driven. Thereby, since a fastener can be entirely embedded in a sleeper main body and a filler, without making a hollow part protrude partially in a hollow part, a fastener can be hold | maintained entirely with a sleeper main body and a filler. Thereby, when an external force is applied to the fastener in a direction in which the fastener is pulled out from the sleeper body, the external force is received as a compressive force for compressing the filler with the filler. Therefore, it is possible to reliably prevent a decrease in the attachment strength of the fastener to the sleeper main body against a conventional pulling force due to the fastener partially protruding into the hollow portion.

  In addition, since the filler can be integrally fixed to the sleeper body in the portion by filling the filler in the portion of the hollow portion, in order to ensure the attachment strength of the fastener to the sleeper body There is no need to perform a joining operation as in the case where a reinforcing member is provided between the rail and the sleeper body on the peripheral surface of the sleeper body. Thereby, the reinforcement work of a railroad sleeper can be easily performed compared with the case where the said reinforcement member is provided in a sleeper main body.

  Furthermore, since the hollow part is formed in the sleeper main body, the amount of the synthetic resin material required to form the sleeper main body compared to the case where the sleeper main body is solid without forming the hollow part. Therefore, it is possible to reliably reduce the manufacturing cost of the sleeper body and reduce the weight of the sleeper body.

  In addition, after the sleeper body is molded by the extrusion molding method, the filling material is filled in the portion of the hollow portion. For example, the filling material is filled by filling the hollow portion in the portion of the sleeper body when the sleeper body is molded. Can be reliably prevented from interfering with cooling from the inside of the sleeper body.

  According to the invention described in claim 8, the filler is made of a synthetic resin material mixed with a foaming agent, and the filler is injected into the portion of the hollow portion in a state where the filler has fluidity. Then, the filler is filled in the hollow portion by foaming the filler.

  When the filler is provided in the hollow portion in a solid state, the cross-sectional area of the filler needs to be smaller than the cross-sectional area of the hollow portion so that the filler can be smoothly inserted into the hollow portion. . For this reason, there exists a possibility that a big clearance gap may be formed between a filler and the surrounding surface of a hollow part in the state by which the filler is arrange | positioned in the said part of a hollow part. If a large gap is formed between the filling and the peripheral surface of the hollow portion, the filling cannot be fixed integrally with the sleeper body in the hollow portion, and the filling moves in the hollow portion. The fastener cannot be properly driven into the filling.

  On the other hand, according to the present invention, as described above, the filler is injected into the hollow portion in a state where the filler has fluidity, and then the filler is foamed. Since the filler is filled in the portion of the hollow portion, it is possible to prevent a large gap from being formed between the cured filler and the peripheral surface of the hollow portion. Thereby, it is possible to reliably prevent a defective driving of the fastener into the filler as in the case where the filler is inserted into the hollow portion in a solid state.

  According to the ninth aspect of the present invention, when the filler is injected into the portion of the hollow portion, the outflow preventing means for preventing the filler from flowing out of the portion to the outside is provided in the hollow portion. Therefore, it is possible to reliably prevent a filling failure of the filler in the portion due to the flowable filler flowing out of the portion of the hollow portion. Thereby, it can prevent reliably that the holding | maintenance effect | action of the fastener by a filler reduces by the filling defect of the filler in the said part of a hollow part reducing.

  According to the invention described in claim 10, the outflow prevention means is a pair of plate members, and is formed with cuts in the sleeper main body at positions spaced apart from each other in the extending direction of the hollow portion and sandwiching the portion of the hollow portion. Each plate member is inserted into the hollow portion through each notch, an injection hole opened between the plate members is formed in the sleeper body, and a filler is injected between the plate members from the injection hole. Since the filling material injected through the injection hole between the plate members inserted into the hollow portion via the injection hole is blocked by each plate member, the filling material is placed between each plate member, that is, outside the portion of the hollow portion. Can be reliably prevented from flowing out.

  According to the eleventh aspect of the present invention, the outflow prevention means is a pair of air bags that are inflated by injecting air at a position that is spaced from each other in the extending direction of the hollow portion and sandwiches the portion of the hollow portion. Each of the sleeper bodies is formed with an insertion hole that opens into the portion of the hollow part, and each air bag is inserted into each insertion hole in a non-inflated state, and is placed in the hollow part, and each air passes through each insertion hole. By injecting air into the bag, each air bag is inflated to a size that allows the inside of the hollow portion to be closed, and an injection hole that opens between the air bags is formed in the sleeper body. Since the filling material is injected, the filling material injected between the air bags via the injection hole is blocked by each air bag, so that the filling material is inserted between the air bags from the outside, that is, the portion of the hollow portion. Make sure to prevent outflow It can be.

  According to the twelfth aspect of the present invention, the outflow prevention means is an air bag that is inflated by injecting air, and an insertion hole that opens in the portion of the hollow portion is formed in the sleeper body so that the air bag is not By being inserted into the insertion hole in the inflated state, it is disposed in the portion of the hollow part, and by injecting air into the air bag through the insertion hole, the air bag is inflated to a size that allows the hollow part to be closed. Furthermore, since the filling material is injected into the air bag through the insertion hole, the filling material is injected into the air bag disposed in the portion of the hollow portion through the insertion hole. It can be held in the part. Thereby, it can prevent reliably that a filler flows out of the said part of a hollow part.

  The present invention will be described with reference to the illustrated embodiments.

  As shown in FIG. 1, a railroad sleeper 10 according to the present invention includes a columnar sleeper body 11 that has a substantially rectangular parallelepiped shape as a whole.

  In the illustrated example, the sleeper body 11 is made of a thermoplastic resin such as polyvinyl chloride, polyethylene, polypropylene, ABS, and an acrylic resin. By using an inexpensive material such as polyvinyl chloride as a raw material of the sleeper main body 11, the cost can be reduced. Moreover, solid materials such as tankar and rubber chips can be mixed with the above-described resins, and thereby the rigidity of the sleeper body 11 can be increased.

  Moreover, the sleeper main body 11 is arrange | positioned on the gravel 12 in the example of illustration. On the upper surface 11 a of the sleeper body 11, a pair of plate-like tie plates 13 are provided in the longitudinal direction of the sleeper body 11 so as to be spaced apart from each other. They are arranged so as to be orthogonal to the longitudinal direction. The tie plate 13 has a function as a pedestal for each rail R, as is well known in the art. Each rail R is fixed to the sleeper main body 11 via each tie plate 13 by a plurality of fasteners 30. Each fastener 30 is comprised with the screw member in the example of illustration, respectively.

  In the sleeper main body 11, six hollow portions 14 to 19 that continuously penetrate the sleeper main body are formed in the illustrated example. In the illustrated example, each of the hollow portions 14 to 19 extends in the longitudinal direction of the sleeper main body 11 and is formed so that each cross-sectional shape is uniform in the extending direction of each of the hollow portions. The end portions 14 a to 19 a of the hollow portions 14 to 19 are open to the outside of the sleeper main body 11 by a pair of end surfaces 11 b facing each other in the longitudinal direction of the sleeper main body 11.

  In the example illustrated in FIG. 2, the two hollow portions 14 and 15 among the plurality of hollow portions 14 to 19 are spaced apart from each other in the width direction of the sleeper main body 11 (the left-right direction as viewed in FIG. 2) and the sleepers. The main body 11 is formed so as to extend in the thickness direction (the vertical direction as viewed in FIG. 2). The cross-sectional shape of each of the hollow portions 14 and 15 has a rectangular shape in which the width dimension along the width direction of the sleeper body 11 is uniform along the thickness direction of the sleeper body 11. By forming the hollow portions 14 and 15 in the sleeper main body 11, the sleeper main body 11 has a pair of plate-like side portions 20 including side surfaces 11c facing each other in the width direction, and a plate-shaped top portion 21 including an upper surface 11a. And a plate-like bottom portion 22 including the lower surface 11d, and a column portion 23 extending between the hollow portions 14 and 15 in the thickness direction of the sleeper body 11 and connecting the top portion and the bottom portion to each other. Yes. Each fastener 30 for fixing each rail R to the sleeper body 11 passes through each tie plate 13 toward the sleeper body 11 and is further screwed into the top so as to penetrate the top 21 of the sleeper body 11. And partially project into the hollow portions 14 and 15.

  In the illustrated example, the two hollow portions 16 and 17 among the hollow portions 16 to 19 other than the hollow portions 14 and 15 are mutually connected to the lower portion 23a of the pillar portion 23 of the sleeper main body 11 in the width direction of the sleeper main body 10. It is formed so as to extend in the thickness direction of the sleeper main body 11 at intervals. On the other hand, the remaining two hollow portions 18 and 19 are formed on the upper portion 23 b of the column portion 23 so as to be spaced apart from each other in the width direction of the sleeper main body 10 and to extend in the thickness direction of the sleeper main body 11. The cross-sectional shape of each of the hollow portions 16 to 19 is a substantially rectangular shape in which the width dimension along the width direction of the sleeper body 11 is uniform along the thickness direction of the sleeper body 11 and both end portions are semicircular. I am doing.

  As shown in FIGS. 2 and 3, the railroad sleeper 10 according to the present invention corresponds to the arrangement position of the pair of rails R on the sleeper body 11 of each hollow portion 14, 15, that is, the arrangement position of each tie plate 13. Each of the portions 14b and 15b to be filled is filled with a filler 24.

  In the illustrated example, the filler 24 is made of a mixed material of a thermosetting urethane resin and pellets made of vinyl chloride (hereinafter referred to as polyvinyl chloride pellets). The weight ratio of the urethane resin and the vinyl chloride pellet is 3: 7 in the illustrated example. The PVC pellet plays a role as a well-known aggregate. Further, the filling 24 is foamed and solidified when filled in the portions 14b and 15b of the hollow portions 14 and 15, and has fluidity when the railway sleeper 10 is manufactured, as will be described later. In this state, it is injected into the portions 14b and 15b of the hollow portions 14 and 15, and foamed in the portions and then cured. As shown in FIG. 2, protruding portions 30 a of the fasteners 30 protruding into the hollow portions 14 and 15 are screwed into the filler 24.

  Further, in each of the hollow portions 14 and 15, in the example shown in FIG. 3, the portions 14 b and 15 b of the hollow portions 14 and 15 are spaced apart from each other in the extending direction of the hollow portions 14 and 15, respectively. A pair of plate members 25 are provided. Each plate member 25 has an area substantially equal to the cross-sectional area of each hollow portion 14, 15. Thereby, in the state where each plate member 25 is arranged in each hollow part 14 and 15, the inside of each hollow part is closed by each plate member 25.

  When manufacturing such a railroad sleeper 10, first, the sleeper body 11 is formed. The sleeper main body 10 is molded using an extrusion molding method well known in the art. By using the extrusion molding method, the production capacity per unit time is high, and when the molding is in a steady state, the burden on the operator is low, so the production cost can be reduced. When the sleeper main body 11 is molded, the synthetic resin material that is the raw material of the sleeper main body 11 is fluidized by heating and passed through a molding die (not shown), and the synthetic resin long body is given a shape. Form. Subsequently, the long body is cut into a predetermined length to form a plurality of resin blocks (not shown), and the resin blocks are solidified by cooling. Thereby, the sleeper main body 11 in which the plurality of hollow portions 14 to 19 are respectively formed is formed.

  Next, the filling material 24 is filled in the portions 14b and 15b of the hollow portions 14 and 15 formed in the sleeper main body 11 according to the method shown in FIG.

  When the filling material 24 is filled in the portions 14b and 15b, first, as shown in FIG. 4A, the portions 14b and 15b (see FIG. 4 (a) shows one portion 14b of the hollow portion 14.) A pair of cuts so as to cross the hollow portions 14 and 15 on both sides in the extending direction of the hollow portions 14 and 15, respectively. 27 is formed using a dedicated cutter 28.

  Subsequently, as shown in FIG. 4 (b), the plate members 25 are inserted into the notches 27, respectively, and are arranged in the hollow portions 14 and 15. As a result, the portions 14 b and 15 b of the hollow portions 14 and 15 are partitioned in the hollow portions 14 and 15 by the plate members 25.

  Next, the filling material 24 is filled into the portions 14b and 15b of the hollow portions 14 and 15, respectively. At this time, the urethane resin constituting the filler 24 is liquid so that the filler 24 has fluidity. Therefore, the filler 24 is a fluid obtained by mixing the urethane resin liquid and the vinyl chloride pellets. When the filler 24 having such fluidity is filled in the portions 14b and 15b of the hollow portions 14 and 15, as shown in FIG. 4C, each plate member is placed on the top portion 21 of the sleeper main body 11. 25, that is, injection holes 29 that are opened in the respective portions 14b and 15b of the hollow portions 14 and 15 are formed by drills D between the notches 27. As shown in FIG. A filler 24 is injected between the plate members 25. At this time, as described above, each plate member 25 is closed in each of the hollow portions 14 and 15 in a state of being disposed in each of the hollow portions 14 and 15, respectively. It is possible to prevent the portions 14b and 15b from flowing out from the inside. That is, each plate member 25 constitutes outflow prevention means 26 for preventing the filler 24 from flowing out of the portions 14b and 15b to the outside thereof.

  After injecting a filling material 24 having fluidity into the respective portions 14b and 15b of the hollow portions 14 and 15, the filling material 24 is foamed by heating the filling material 24 as shown in FIG. 4 (e). Let In the illustrated example, the expansion ratio of the filler 24 is about 1.2 times. By foaming the filler so that the filler 24 is in close contact with the top portion 21, the bottom portion 22, and the plate members 25 that define the inside of each portion 14 b, 15 b of each hollow portion 14, 15, each portion 14 b, The inside of 15 b is filled with the filler 24.

  As a result, the railroad sleeper 10 including the sleeper main body 11 filled with the filler 24 inside the portions 14b and 15b of the hollow portions 14 and 15 is formed.

  Thereafter, the rails are fixed to the sleeper body 11. When the rails are fixed to the sleeper main body 11, first, the tie plates 13 are attached to the upper surface 11 a of the sleeper main body 11 with, for example, an adhesive (not shown). Next, each rail R is arranged on each tie plate 13 so as to be orthogonal to the longitudinal direction of the sleeper main body 11, and is fastened so as to penetrate each rail R, each tie plate 13 and the top 21 of the sleeper main body 11. Screw the tool 30. Thereby, each rail R is fixed to the sleeper main body 11 via each tie plate 13, respectively. At this time, the protruding portion 30 a of each fastener 30 protruding into the hollow portions 14 and 15 is screwed into the filler 24.

  As a result of measuring the attachment strength of each fastener 30 to the sleeper main body 11 with respect to the tensile force in the railroad sleeper 10 according to the present invention, even if the tensile force acting on each fastener 30 reaches 51 [kN]. Each fastener 30 did not come out of the sleeper main body 11. In addition, when each fastener 30 comes out of the sleeper main body 30 when the magnitude of the tensile force acting on each fastener 30 is 6 [kN] or less, it is determined that the attachment of each fastener 30 is defective, It is necessary to replace the sleeper body 11.

  Further, as a result of pulling each fastener 30 in the direction of pulling out from the sleeper main body 11 1 million times with a pulling force of 18 [kN], special rattling between each fastener 30 and the sleeper main body 11 and the like. Did not occur, and no particular problems occurred in subsequent use.

  According to the present embodiment, as described above, since the sleeper body 11 is made of a synthetic resin material, the sleeper body 11 is less likely to be corroded and damaged than the sleeper body 11 is made of wood. Since the weight of the sleeper main body 11 is lighter than that of the case where the main body 11 is made of concrete, as in the conventional case, the sleeper main body 11 is likely to be corroded and damaged, and the sleeper main body 11 has a reduced useful life and the sleeper main body. The fall of the efficiency of the laying operation | work of the sleeper main body 11 by the weight of 11 being heavy can be prevented reliably.

  The sleeper main body 11 is formed with a plurality of hollow portions 14 to 19 that penetrate the sleeper main body continuously in the longitudinal direction, and both ends 14 a to 19 a of the hollow portions 14 to 19 are respectively connected to the sleeper main body 11. Since it opens to the opposing both end surfaces 11b, when cooling the molten resin material used as the sleeper main body at the time of molding of the sleeper main body 11, the sleeper main body 11 has its outer surface and inner surfaces of the hollow portions 14-19. Can be cooled as a whole. This prevents a large difference between the shrinkage rate of the outer periphery of the sleeper body 11 and the shrinkage rate inside the sleeper body 11, so that when the molten resin material is cooled, conventional distortion, so-called sink marks, etc. It is prevented from occurring in the sleeper body 11 that is a molded product. Therefore, it is possible to reliably prevent a decrease in the dimensional accuracy of the sleeper body 11 as in the past due to distortion, sink marks, or the like occurring in the sleeper body 11.

  Furthermore, inside the portions 14b and 15b corresponding to the positions where the rails R are arranged on the sleeper main body 11 of the hollow portions 14 and 15, the rails R are screwed into the sleeper main body in order to fix the rails R to the sleeper main body 11, respectively. Since the filling portion 24 into which the protruding portions 30a of the respective fasteners 30 are screwed is filled, when the fasteners 30 are screwed into the upper surface 11a of the sleeper body 11, the sleepers Each fastener 30 passes through the top portion 21 which is a thin portion formed between the upper surface 11a of the sleeper main body 11 and the hollow portions 14 and 15 by forming the hollow portions 14 and 15 in the main body 11. Even if the hollow portions 14 and 15 partially protrude into the portions 14 b and 15 b, the protruding portions 30 a are screwed into the filling 24 filled in the portions 14 b and 15 b of the hollow portions 14 and 15. It is possible. Thereby, since each fastener 30 can be entirely embedded in the sleeper body 11 and the filling 24 without partially projecting into the hollow portions 14 and 15, each fastener 30 is filled with the sleeper body 11 and the filling material 24. The object 24 can be held as a whole. Thereby, when, for example, a bolt is used for each fastener 30, the filling 24 plays a role as a nut, so that an external force acts on each fastener 30 in the direction of pulling out each fastener from the sleeper body 11. The external force is sometimes received as a compressive force that compresses the filler with the filler 24. Therefore, it is possible to reliably prevent a decrease in the attachment strength of each fastener 30 to the sleeper main body 11 with respect to a conventional pulling force due to each fastener 30 partially protruding into each hollow portion 14, 15. it can.

  Moreover, since the filler 24 can be integrally fixed to the sleeper body 11 in the portions 14b and 15b by filling the filler 24 in the portions 14b and 15b of the hollow portions 14 and 15, the sleepers In order to secure the attachment strength of each fastener 30 to the main body 11, it is not necessary to perform a joining operation as in the case where a reinforcing member is provided between the rail R and the sleeper main body 11 on the peripheral surface of the sleeper main body 11. Thereby, compared with the case where the said reinforcement member is provided in the sleeper main body 11, the reinforcement operation | work of the railroad sleeper 10 can be performed easily.

  Further, since the plurality of hollow portions 14 to 19 are formed in the sleeper main body 11, the sleeper main body 11 is made to be more solid than the case where the hollow main body 11 is formed without the hollow portions 14 to 19 being formed. Since the amount of the synthetic resin material required for forming can be reduced, the manufacturing cost of the sleeper main body 11 can be reduced and the weight of the sleeper main body 11 can be reliably reduced.

  In addition, as described above, the filling 24 is made of a synthetic resin material, and is filled in the portions 14b and 15b of the hollow portions 14 and 15 after the sleeper body 11 is molded. By filling the hollow portions 14 and 15 into the portions 14 b and 15 b when the sleeper main body 11 is formed, it is possible to reliably prevent the filler 24 from interfering with cooling from the inside of the sleeper main body 11.

  Further, as described above, the filler 24 is injected into the portions 14b and 15b of the hollow portions 14 and 15 in a fluid state and then hardens in the portions.

  For example, when the filler 24 is provided in the portions 14b and 15b of the hollow portions 14 and 15 in a solid state, the filler 24 can be smoothly inserted into the hollow portions 14 and 15. The cross-sectional area of 24 needs to be smaller than the cross-sectional areas of the hollow portions 14 and 15. Therefore, a large gap may be formed between the filler 24 and the peripheral surfaces of the hollow portions 14 and 15 in a state where the filler 24 is disposed in the portions 14b and 15b of the hollow portions 14 and 15. There is. If a large gap is formed between the filler 24 and the peripheral surfaces of the hollow portions 14 and 15, the filler 24 cannot be fixed integrally with the sleeper body 11 in the hollow portions 14 and 15. When the filler 24 moves in the hollow portions 14 and 15, the fasteners 30 cannot be properly screwed into the filler 24.

  On the other hand, according to the present invention, as described above, the filler 24 is injected into the portions 14b and 15b of the hollow portions 14 and 15 in a state where the filler 24 has fluidity. Since it hardens | cures, it is not necessary to make the cross-sectional area of the filler 24 smaller than the cross-sectional area of each hollow part 14 and 15 in order to insert the filler 24 into each hollow part 14 and 15 smoothly. This prevents a large gap from being formed between the hardened filling 24 and the peripheral surfaces of the hollow portions 14 and 15, so that the filling 24 is solid in the hollow portions 14 and 15. Thus, it is possible to reliably prevent the screwing failure of each fastener 30 into the filler 24 as in the case of being inserted into the filler.

  Further, as described above, the outflow prevention means 26 is provided in each of the hollow portions 14 and 15 to prevent the filler 24 from flowing out of the portions 14b and 15b. Further, it is possible to reliably prevent the filling material 24 having fluidity from flowing out of the portions 14b and 15b of the hollow portions 14 and 15 to cause a filling failure of the filling material 24 into the portions. it can. Accordingly, it is possible to reliably prevent the holding action of each fastener 30 by the filler 24 from being reduced due to poor filling of the filler 24 into the portions 14b and 15b of the hollow portions 14 and 15. Can do.

  Further, as described above, the outflow prevention means 26 is a pair of plate members 25 arranged so as to be spaced from each other in the extending direction of the hollow portions 14 and 15 and sandwich the portions 14b and 15b of the hollow portions. Since the filler 24 is injected between the plate members 25, the filler 24 injected between the plate members 25 is blocked by the plate members 25. It is possible to reliably prevent outflow from 25 to the outside, that is, to the outside of the portions 14 b and 15 b of the hollow portions 14 and 15.

  In addition, as described above, the formation of the hollow portions 14 and 15 in the sleeper main body 11 forms the pillar portions 23 extending in the thickness direction of the sleeper main body 11 between the hollow portions 14 and 15. When a load is applied from above 11, each side portion 21 and the column portion 23 act as a compressive force for compressing them in their respective extending directions. I can take it. Therefore, it is possible to reliably prevent the sleeper main body 11 from being deformed by the load that the sleeper main body 11 receives from above.

  Further, as described above, solid portions 24 are filled in the portions 14b and 15b of the hollow portions 14 and 15, and a plurality of the outflow prevention means 26 are provided in the hollow portions 14 and 15. Since the plate member 25 is provided so as to close the inside of the hollow portions 14 and 15, when an external force is applied to the sleeper main body 11 from above or from the side, the external force is applied to the filler 24 and each plate member. Therefore, the external force can be received by the filler 24 and the plate members 25 in addition to the side portions 21 and the column portions 23. Thereby, since the deformation | transformation of the sleeper main body 11 by the said external force can be prevented more reliably, the deformation | transformation of the sleeper main body 11 by the load received via each rail R from a train can be prevented more reliably.

  Further, as described above, the cross-sectional shapes of the hollow portions 14 to 19 are uniform in the extending direction of the hollow portions.

  For example, when the cross-sectional shapes of the hollow portions 14 to 19 are not uniform and non-uniform in the extending direction of the hollow portions, the side portions 20, the top portion 21, the bottom portion 22, and the pillars formed in the sleeper main body 11. Since the thickness dimension of the part 23 becomes non-uniform in the longitudinal direction of each of the hollow parts 14 to 19, when the sleeper body 11 is molded, cooling is performed to solidify the molten resin material that becomes the sleeper body 11 that is a molded product. As a result, a difference in shrinkage ratio occurs between the thick part and the thin part. For this reason, there exists a possibility that distortion may arise in the sleeper main body 11. FIG. In addition, when the sleeper main body 11 is formed with a thick part and a thin part, stress due to a load acting on the sleeper main body 11 is concentrated on the thin part, which may cause damage to the sleeper main body 11.

  On the other hand, according to the present invention, as described above, since the cross-sectional shape of each hollow portion 14-19 is uniform in the extending direction of each hollow portion, each side portion 20, top portion 21, Since the thickness dimension of the bottom part 22 and the pillar part 23 becomes uniform in the longitudinal direction of each hollow part 14-19, the occurrence of distortion to the sleeper main body 11 and the case where those thickness dimensions are not uniform and Damage to the sleeper main body 11 can be prevented more reliably.

  In the present embodiment, at the time of manufacturing the railroad sleeper 10, the example in which the notches 27 are formed in the top portion 21 of the sleeper main body 11 in order to insert the plate members 25 into the hollow portions 14 and 15, respectively, is shown. Instead of this, or in addition to this, each notch 27 can be formed in each side part 20 of the sleeper main body 11. In this case, compared with the case where each notch 27 is formed in the top part 21 of the sleeper main body 11, it is possible to reliably prevent a decrease in the strength of the sleeper main body 11 with respect to the bending force due to the formation of each cut 27 in the sleeper main body 11. it can.

  Moreover, although the example which leaves each board member 25 in each hollow part 14 and 15 after manufacture of the railroad sleeper 10 was shown in the present Example, it replaces with this and each board member 25 is replaced with the railroad sleeper 10 for railroad. Can be removed from each of the hollow portions 14 and 15.

  Further, in the present embodiment, the example in which the outflow prevention means 26 is constituted by a plurality of plate members 25 is shown, but instead of this, as shown in FIG. 5, an air bag 31 that is inflated by injecting air. Thus, the outflow prevention means 26 can be configured.

  In the illustrated example, the air bag 31 is disposed so as to be spaced apart from each other in the extending direction of the hollow portions 14 and 15 and sandwich the portions 14b and 15b of the hollow portions 14 and 15, respectively. The portions 14 and 15 are inflated to close the inside.

  When filling the filler 24 into the portions 14b and 15b of the hollow portions 14 and 15 using the air bag 31, first, as shown in FIG. The insertion holes 32 that are spaced apart from each other in the extending direction of the hollow portions 14 and 15 and open into the respective portions at the positions sandwiching the portions 14b and 15b of the hollow portions 14 and 15 are, for example, using the drill D described above. Then, the air bags 31 are inserted into the hollow portions 14 and 15 through the insertion holes 32 in a non-inflated state. An insertion hole 32 can be formed in each side portion 20 in place of or in addition to the top portion 21.

  Subsequently, as shown in FIG. 6 (b), each air bag is infused by injecting air from each insertion hole 32 into each air bag 31 through air holes (not shown) formed in each air bag 31. The inside of the hollow portions 14 and 15 is expanded to a size that can be closed. After inflating each air bag 31, the air hole can be closed with, for example, a tape.

  Next, as shown in FIG. 6C, an injection hole 33 that opens between the air bags 31, that is, in the portions 14 b and 15 b, is formed in the top portion 21 of the sleeper body 11 using, for example, the drill D described above. The liquid filler 24 is injected between the air bags 31 through the injection holes 33. The injection hole 33 can be formed in each side portion 20 in place of the top portion 21 or in addition to the top portion 21.

  After that, as shown in FIG. 4, the filler 24 is foamed to fill the portions 14 b and 15 b of the hollow portions 14 and 15. Thereby, the filling of the filling material 24 into the portions 14b and 15b of the hollow portions 14 and 15 is completed.

  According to the example shown in FIGS. 5 and 6, as described above, each of the hollow portions 14 in a state in which the plurality of air bags 31 that are the outflow prevention means 26 are inflated so as to close the inside of the respective hollow portions 14 and 15. 15, and the filling 24 is injected between the air bags 31, so that the filling 24 injected between the air bags 31 is blocked by the air bags 31. Can be reliably prevented from flowing from between the air bags 31 to the outside, that is, to the outside of the portions 14b and 15b of the hollow portions 14 and 15.

  In the example shown in FIGS. 5 and 6, the air bags 31 are arranged so as to be spaced from each other in the extending direction of the hollow portions 14 and 15 and sandwich the portions 14 b and 15 b of the hollow portions 14 and 15, respectively. Instead of this, instead of this, as shown in FIG. 7, the air bag 31 is inflated so as to close the inside of the hollow portions 14 and 15, respectively, and the portion 14b of each hollow portion. , 15b. In this case, the filler 24 can be injected into each air bag 31.

  In this case, when filling the filling 24 into the portions 14b and 15b of the hollow portions 14 and 15, first, as shown in FIG. For example, the above-described drill D is used to form the insertion holes 34 opened in the respective portions 14b and 15b, and the air bags 31 are passed through the insertion holes 34 in the non-inflated state into the hollow portions 14 and 15, respectively. insert. An insertion hole 34 can be formed in each side portion 20 instead of or in addition to the top portion 21.

  Subsequently, as shown in FIG. 8B, each air bag is infused by injecting air from each insertion hole 34 into each air bag 31 through air holes (not shown) formed in each air bag 31. The inside of the hollow portions 14 and 15 is expanded to a size that can be closed. After inflating each air bag 31, the air hole can be closed with, for example, a tape.

  Further, as shown in FIG. 8 (c), the filling material 24 is injected into each air bag 31 through each insertion hole 34.

  Thereafter, in the same manner as shown in FIG. 4, the filling material 24 is foamed to fill each air bag 31. Thereby, the filling of the filling material 24 into the portions 14b and 15b of the hollow portions 14 and 15 is completed.

  According to the example shown in FIGS. 7 and 8, the filling material 24 is filled by injecting the filling material 24 into the air bags 31 disposed in the portions 14b and 15b of the hollow portions 14 and 15 through the insertion holes 34, respectively. The object 24 can be held in the portions 14b and 15b of the hollow portions 14 and 15, respectively. Thereby, it can prevent reliably that the filling material 24 flows out of the said parts 14b and 15b of each hollow part 14 and 15. FIG.

  In the example shown in FIGS. 1 to 8, the example in which the outflow prevention means 26 is configured by a plurality of plate members 25 and air bags 31 is shown, but instead of this, for example, although not shown, each of the hollow portions 14 and 15. As long as it is possible to prevent the filling material from flowing out from the inside of the hollow portion like the cylindrical members respectively surrounding the portions 14b and 15b, the configurations other than those shown in FIGS. Outflow prevention means can be applied to the present invention. When the outflow prevention means 26 is constituted by the cylindrical member, at the time of manufacturing the railroad sleeper 10, for example, a circular notch is formed in each side part 20 or the top part 21 of the sleeper main body 11, and the cylindrical member is connected to each hollow part 14, 15 can be inserted through the notch.

  Moreover, in the example shown in FIG. 1 thru | or FIG. 8, it respond | corresponds to the arrangement position of a pair of rail R to the sleeper main body 11 of each hollow part 14 and 15 among several hollow parts 14-19, ie, the arrangement position of each tie plate 13. Although the example which filled the inside of each part 14b and 15b with the filling material 24 was shown, it replaces with this or in addition to this, each type of each hollow parts 16-19 other than each hollow part 14 and 15 Each portion corresponding to the arrangement position of the rate 13 can be filled with the filler 24.

  Furthermore, in the example shown in FIGS. 1 to 8, an example in which each hollow portion 14 to 19 extends in the longitudinal direction of the sleeper main body 11 is shown, but instead, a plurality of hollow portions are provided in the sleeper main body 11 with a width thereof. It can be formed to extend in the direction.

  Moreover, in the example shown in FIGS. 1 to 8, an example in which the six hollow portions 14 to 19 are formed in the sleeper main body 11 is shown, but instead, the number of hollow portions formed in the sleeper main body 11 is appropriately set. Can be changed.

  Further, in the example shown in FIGS. 1 to 8, an example in which the filler 24 is composed of a urethane resin and a pellet made of vinyl chloride is shown, but instead, the filler 24 is thermoset other than the urethane resin. The resin can be composed of a resin other than a thermosetting resin, a thermosetting resin, or a material other than a synthetic resin material, and an aggregate other than a vinyl chloride pellet.

  Further, in the example shown in FIGS. 1 to 8, the example in which the fastener 30 is configured by a screw member has been shown, but instead, it may be configured by a member other than the screw member, such as a nail.

1 is a perspective view schematically showing a railroad sleeper according to the present invention. It is a cross-sectional view along the II line of FIG. It is a longitudinal cross-sectional view along the II-II line of FIG. (A), (b) and (c) are explanatory drawings which show roughly the manufacturing method of the railroad sleeper which concerns on this invention, respectively. FIG. 5 is a cross-sectional view schematically showing a railroad sleeper according to an embodiment different from the embodiment shown in FIGS. 1 and 4. (A), (b) and (c) is explanatory drawing which shows roughly the manufacturing method of the railroad sleeper which concerns on the example shown in FIG. 5, respectively. It is a cross-sectional view which shows schematically the railroad sleeper which concerns on the Example different from the Example shown in FIG.1 and FIG.6. (A), (b) and (c) is explanatory drawing which shows roughly the manufacturing method of the railroad sleeper which concerns on the example shown in FIG. 7, respectively.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Railway sleeper 11 Sleeper main body 14,15,16,17,18,19 Hollow part 14b, 15b part 24 Filler 25 Plate member 26 Outflow prevention means 27 Cut 29,33 Injection hole 30 Fastener 31 Air bag 32,34 Insertion hole R rail

Claims (12)

  A railway sleeper comprising a sleeper body made of a synthetic resin material, wherein both ends of the sleeper body are open to opposite end surfaces of the sleeper body, and the sleeper body is continuous in the longitudinal direction or the width direction. At least one hollow portion is formed, and each of the rails is fixed to the sleeper body inside the portion corresponding to the arrangement position of the pair of rails to the sleeper body of the hollow portion. A railway sleeper characterized by being filled with a filler into which a protruding portion into the hollow portion of the fastener attached to the sleeper main body enters.   The railroad sleeper according to claim 1, wherein the filler is made of a synthetic resin material and is filled in the portion of the hollow portion after the sleeper body is molded.   The filler is injected into the part of the hollow part in a fluid state and then hardens in the part, and the inside of the hollow part is filled from the part to the outside. The railroad sleeper according to claim 1 or 2, further comprising an outflow prevention means for preventing an object from flowing out.   The outflow prevention means is a pair of plate members arranged so as to be spaced apart from each other in the extending direction of the hollow portion and sandwich the portion of the hollow portion, and the filler is injected between the plate members. The railroad sleeper according to claim 3, wherein   The outflow prevention means is a pair of air bags that are inflated by injecting air, and the air bags are inflated so as to close the inside of the hollow part and spaced apart from each other in the extending direction of the hollow part. The railroad sleeper according to claim 3, wherein the railroad sleeper is arranged so as to sandwich the portion of the hollow portion, and the filler is injected between the air bags.   The outflow prevention means is an air bag inflated by injecting air, and the air bag is disposed in the portion of the hollow portion in an inflated state so as to close the inside of the hollow portion, and the filling material The railway sleeper according to claim 3, wherein is injected into the air bag.   A pillar-shaped sleeper body made of a synthetic resin material is formed with at least one hollow portion having both ends open to opposite end surfaces of the sleeper body and continuously passing through the sleeper body in the longitudinal direction or the width direction. A method of manufacturing a railway sleeper comprising a sleeper body that is formed, and after forming the sleeper body in which the hollow portion is formed, a portion corresponding to an arrangement position of a pair of rails on the sleeper body of the hollow portion A method of manufacturing a railway sleeper, characterized in that the inside of the rail is filled with a filler into which a protruding portion into the hollow portion of a fastener attached to the sleeper body is fixed to fix each rail to the sleeper body. .   The filler is made of a synthetic resin material mixed with a foaming agent, and the filler is injected into the portion of the hollow portion in a state where the filler has fluidity. The method of manufacturing a railway sleeper according to claim 7, wherein the filling material is filled in the portion of the hollow portion by foaming.   When the filler is injected into the portion of the hollow portion, an outflow prevention means is provided in the hollow portion for preventing the filler from flowing out of the portion to the outside. The manufacturing method of the railroad sleeper of Claim 8.   The outflow prevention means is a pair of plate members, each of which is spaced apart from each other in the extending direction of the hollow portion and forms a notch in the sleeper body at a position sandwiching the portion of the hollow portion, It is inserted into the hollow portion through the respective cuts, an injection hole opened between the plate members is formed in the sleeper body, and the filler is injected between the plate members from the injection hole. The manufacturing method of the railroad sleeper of Claim 9.   The outflow prevention means is a pair of air bags that are inflated by injecting air, and are spaced apart from each other in the extending direction of the hollow part and sandwich the part of the hollow part in the sleeper body, respectively. An insertion hole is formed in the portion of the air bag, and each air bag is inserted into the insertion hole in a non-inflated state, and is disposed in the hollow portion, and the air bag passes through the insertion hole. By injecting air into the air bag, each air bag is inflated to a size that allows the inside of the hollow portion to be closed, and an injection hole that opens between the air bags is formed in the sleeper body. The method for manufacturing a railway sleeper according to claim 9, wherein the filler is injected between the bags. The outflow prevention means is an air bag that expands by injecting air, and an insertion hole that opens into the portion of the hollow portion is formed in the sleeper body, and the air bag is unexpanded to form the insertion hole. It is placed in the part of the hollow part by inserting into the air bag, and the air bag is inflated to a size such that the inside of the hollow part is closed by injecting air into the air bag through the insertion hole, Furthermore, the said sleeper is inject | poured in the said air bag through the said insertion hole, The manufacturing method of the railroad sleeper of Claim 9 characterized by the above-mentioned.

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