JP2016215431A - Flask for sleeper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flask for a sleeper mass-producible at high precision while suppressing the increase of production cost, and further preventing the damage of a cement based material for molding a sleeper.SOLUTION: Provided is a flask 1 for a sleeper for molding a sleeper 7. The flask 1 for a sleeper includes: a face plate 2 formed almost so as to be a planar shape; and a pair of side plates 3 elongating from both the side parts 2a in the width direction X of the face plate 2 to a height direction Y. The face plate 2 and the side plates 3 are produced with a cement based material, and further, the inside 4 of the frame formed so as to be surrounded around the face plate 2 and a pair of side plates 3 is placed with a cement based material for forming a sleeper 7. In the face plate 2, a rail fastening apparatus installing hole 5 for fitting the sleeper 7 with the rail fastening apparatus fixed with the rail so as to pass from the frame inside 4 to the plate thickness direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sleeper mold for molding sleepers.

  Conventionally, when manufacturing the main body form of the steel formwork for concrete sleepers, the welding site and its polishing finish amount are reduced, the work time required for them is shortened, and the rail seating surface bottom plate part can be easily As what makes it possible to ensure the accuracy, for example, a steel mold disclosed in Patent Document 1 has been proposed.

  The steel mold disclosed in Patent Document 1 is a main frame formed in a groove shape with an elongated bottom plate portion and side plate portions located on both sides in the width direction, and is attached to and detached from both longitudinal ends of the main frame. The end face mold is provided with unbonded PC steel holding parts for introducing pre-stress, and the longitudinal ends of the main body mold are in the vicinity of both ends in the longitudinal direction. A steel formwork for concrete sleepers in which a bottom plate portion for forming a rail seating surface having a predetermined slope and two through holes corresponding to the rail width is formed at a position higher than the upper surface of the bottom plate portion on the side. And the said base plate part for rail seat surface shaping | molding and the side-plate part located in the both sides are formed by the bending process of the steel plate.

JP 2006-255904 A

  However, in the steel mold disclosed in Patent Document 1, the main body mold formed by the bottom plate portion and the side plate portion is manufactured by a steel member, and the bottom plate portion is formed by bending a steel plate. When forming the side plate portion, high accuracy is required for bending. Moreover, since the steel formwork disclosed in Patent Document 1 requires high-precision welding work even when the steel bottom plate part and the side plate part are connected by welding, the manufacture of the steel formwork is required. Cost will increase.

  Moreover, since the main body formwork is manufactured by the steel member, the steel formwork disclosed in Patent Document 1 may corrode the main body formwork of the steel member. It will be inferior. Furthermore, the steel formwork disclosed in Patent Document 1 is such that the concrete sleepers are formed with the main body formwork of the steel member, so that when the sleeper concrete is steam-cured, the sleeper concrete is made of steel formwork. There was a problem that it was cracked by being pulled by thermal expansion.

  Therefore, the present invention has been devised in view of the above-described problems, and can be mass-produced with high accuracy while suppressing an increase in manufacturing cost, and a cement-based material for molding sleepers. The purpose is to provide a sleeper mold that can prevent damage.

  The sleeper mold according to the first invention is a sleeper mold for molding sleepers, and a pair of face plates formed in a substantially flat plate shape and extending in the height direction from both side portions of the face plate in the width direction. And the face plate and the side plate are made of a cement-based material, and a cement-based material for molding sleepers is formed inside a frame formed by being surrounded by the face plate and the pair of side plates. The face plate is provided with a rail fastening device installation hole for attaching a rail fastening device to which a rail is fixed to a sleeper, penetrating in the thickness direction from the inside of the frame. And

  The sleeper mold according to a second aspect of the present invention is the first invention, wherein the rail fastening device installation hole is formed to extend in the depth direction of the face plate, and the corner of the rail fastening device installation hole is curved. It is characterized by being formed.

  The sleeper mold according to a third aspect of the present invention is the first or second aspect of the present invention, wherein the rail fastening device installation holes are provided at a plurality of locations in the depth direction of the face plate, and each rail fastening device is installed. As for attaching a plurality of rail fastening devices to sleepers by holes, each of the rail fastening device installation holes is formed to extend in the depth direction.

  The sleeper mold according to the fourth invention is any one of the first to third inventions, wherein the face plate and the side plate are manufactured by placing a fiber-reinforced cement-based material on the mold, After placing the fiber reinforced cementitious material while applying vibration to the formwork, before the fiber reinforced cementitious material placed on the formwork is cured, by giving vibration to the formwork again, The inside of the fiber reinforced cementitious material is characterized by being degassed.

  The sleeper mold according to a fifth aspect of the present invention is the cement system for molding sleepers, wherein the face plate and the side plate are fixed to a metal frame in any of the first to fourth aspects of the invention. When steam curing is performed after placing the material inside the frame, the thermal expansion of the cementitious material for forming sleepers does not accompany the thermal expansion of the pedestal, and the thermal expansion of the face plate and the side plate. It is a feature that accompanies this.

  According to the first to fifth inventions, the face plate and the pair of side plates are integrally formed of the cement material by placing the cement material on the mold. At this time, according to the first to fifth inventions, once the high-precision formwork is manufactured, this formwork can be used repeatedly. Therefore, the sleeper formwork can be easily and repeatedly manufactured with high precision. it can. Thereby, according to 1st invention-5th invention, while using the formwork manufactured with high precision, while suppressing the increase in the manufacturing cost of a sleeper formwork, it is highly accurate. It becomes possible to mass-produce with. In addition, according to the first to fifth inventions, the face plate and the pair of side plates are made of a cement-based material, so that corrosion of steel members such as steel molds is not a concern. It becomes possible to improve the maintainability of the frame.

  In particular, according to the second invention, the corner of the rail fastening device installation hole is formed to be curved. At this time, according to the second invention, when the cementitious material of the face plate hardens and contracts, the rail fastening device installation hole is restrained by the protruding portion of the inner frame, etc. Stress concentration at the corner of the rail fastening device installation hole can be avoided. Thereby, according to 2nd invention, although a face plate is manufactured with a cementitious material, the crack by a stress concentration like the case where the corner of the hole for rail fastening device installation was formed at right angles is used. Occurrence can be suppressed.

  In particular, according to the third invention, although a plurality of rail fastening devices are inserted into each rail fastening device installation hole extending in the depth direction of the face plate, since the heat transfer coefficient of the face plate of cementitious material is small, The extension in the depth direction due to thermal expansion is suppressed at the rail fastening device installation hole. According to the third aspect of the present invention, when the cementitious material of the sleeper is cured, the adjacent rail fastening device is connected to the rail fastening device even though the gap for inserting the protruding support member is formed in the through hole of the rail fastening device. Each rail fastening device installation hole is restrained in the depth direction. Thus, according to the third aspect of the present invention, the heat transfer coefficient is reduced by the face plate of the cement-based material, so that the movement of the adjacent rail fastening device is suppressed in each rail fastening device installation hole, and the adjacent rail fastening is performed. It is possible to keep the apparatus interval within the allowable error range.

  In particular, according to the fourth invention, since the face plate and the pair of side plates can be made of fiber-reinforced cement-based material, sufficient strength of the member is exhibited at the same time as making the face plate and the pair of side plates thinner and lighter. It becomes possible. Further, according to the fourth invention, since the fiber reinforced cementitious material is vibrated again before the fiber reinforced cementitious material is hardened even though the viscosity of the fiber reinforced cementitious material is high, It is possible to avoid a reduction in member strength by defoaming the internal bubbles.

  In particular, according to the fifth aspect, when steam curing the sleeper cement-based material, the thermal expansion of the cement-based material does not accompany the thermal expansion of the metal frame, but accompanies the thermal expansion of the face plate and the side plate. It will be a thing. Thus, according to the fifth aspect of the present invention, it is possible to suppress the gradient of the top surface of the sleeper within an allowable error range by curing the sleeper cement-based material while maintaining a predetermined gradient on the surface of the face plate. Become. Further, according to the fifth invention, since the thermal expansion of the cement-based material does not accompany the thermal expansion of the gantry, the sleeper cement-based material is not pulled in the depth direction, and damage to the sleeper can be prevented. It becomes.

It is a perspective view which shows the formwork for sleepers to which this invention is applied. It is a front view which shows the formwork for sleepers to which this invention is applied. (A) is a top view which shows the formwork for sleepers to which this invention is applied, (b) is the sectional view on the AA line. (A) is a front view which shows the rail fastening apparatus installation hole of the formwork for sleepers to which this invention is applied, (b) is the top view. (A) is a front view which shows the formwork for manufacturing the formwork for sleepers to which this invention is applied, (b) is the side view. (A) is a front view which shows the fiber reinforced cementitious material cast in a formwork in order to manufacture the sleeper formwork to which this invention is applied, (b) is the side view. (A) is a front view which shows the state by which the sleeper formwork to which this invention is applied is removed, (b) is a front view which shows the state by which the sleeper formwork was reversed. It is a perspective view which shows the sleeper shape | molded with the formwork for sleepers to which this invention is applied. It is a side view which shows the sleeper shape | molded with the formwork for sleepers to which this invention is applied. (A) is a front view which shows the rail fastening apparatus installed in the formwork for sleepers to which this invention is applied, (b) is the BB sectional drawing. (A) is a front view which shows the cement-type material casted to the sleeper formwork to which this invention is applied, (b) is the BB sectional drawing. It is a side view which shows the sleeper which installs the formwork for sleepers to which this invention is applied to a metal mount, and is steam-cured. It is a front view which shows the sleeper demolded from the sleeper formwork to which this invention is applied. It is an expanded side view which shows the space | interval which spaced apart the adjacent rail fastening apparatus in the sleeper shape | molded with the sleeper mold to which this invention is applied, and the gradient of the top surface of a sleeper. (A) is a top view which shows the corner formed by curving in the rail fastening device installation hole of the sleeper formwork to which the present invention is applied, and (b) is a corner formed at a right angle. FIG.

  Hereinafter, an embodiment for implementing a sleeper mold 1 to which the present invention is applied will be described in detail with reference to the drawings.

  The sleeper mold 1 to which the present invention is applied is used for molding sleepers 7 as shown in FIG. Here, the sleeper mold 1 to which the present invention is applied is particularly made of a cement-based material such as mortar or concrete mixed with cement, water, sand, and the like.

  As shown in FIG. 2, a sleeper mold 1 to which the present invention is applied includes a face plate 2 formed in a substantially flat plate shape, and a pair of side plates extending in the height direction Y from both side portions 2a in the width direction X of the face plate 2. 3. The sleeper mold 1 to which the present invention is applied is surrounded by a face plate 2 and a pair of side plates 3, and a frame interior 4 is formed on the surface 2 b side of the face plate 2.

  As shown in FIG. 3A, the sleeper mold 1 to which the present invention is applied is formed by extending a face plate 2 and a pair of side plates 3 with a predetermined extension L in the depth direction Z. As shown in FIG. 3B, the sleeper mold 1 to which the present invention is applied is such that the surface 2b of the face plate 2 is inclined downward with a predetermined gradient from the center C in the depth direction Z toward both ends S. Formed.

  The face plate 2 and the side plate 3 are made of a cement-based material such as mortar or concrete. For example, fiber reinforced mortar or fiber reinforced concrete mixed with a fiber material such as synthetic fiber, glass fiber, or metal fiber. These fiber reinforced cementitious materials are used.

  The face plate 2 is provided with rail fastening device installation holes 5 at a plurality of locations in the depth direction Z of the face plate 2. For example, the rail fastening device installation holes 5 are provided at two locations. As shown in FIG. 4, the face plate 2 has a front surface 2b and a back surface 2c formed in a substantially flat shape, and extends from the front surface 2b to the back surface 2c of the face plate 2 through the frame inside 4 in the plate thickness direction. Fastening device installation holes 5 are provided.

  As shown in FIG. 4A, the rail fastening device installation hole 5 has a stepped portion 5b formed by partially cutting the surface 2b of the face plate 2. As shown in FIG. Further, the rail fastening device installation hole 5 has a side surface 5a of the rail fastening device installation hole 5 such that the opening dimension D1 on the front surface 2b side of the face plate 2 is larger than the opening dimension D2 on the back surface 2c side of the face plate 2. Is formed to be inclined in a substantially straight line.

  As shown in FIG. 4B, the rail fastening device installation hole 5 is formed in a substantially rectangular shape by extending in the depth direction Z of the face plate 2. The rail fastening device installation hole 5 is formed in a substantially rectangular shape, so that the pair of long sides 5c face each other and is formed in a substantially linear shape, and the pair of short sides 5d face each other. It will be formed in a straight line.

  The rail fastening device installation hole 5 is formed by curving so that four corners 5e formed at the boundary between the long side 5c and the short side 5d are substantially arc-shaped in the in-plane direction of the face plate 2. Is done. The rail fastening device installation hole 5 is formed such that the step portion 5b extends in the depth direction Z of the face plate 2 along the long side 5c, the short side 5d, and the corner portion 5e of the rail fastening device installation hole 5.

  As shown in FIG. 2, the side plate 3 has an upper width dimension E1 of the frame interior 4 on the upper side in the height direction Y larger than a lower width dimension E2 of the frame interior 4 on the lower side in the height direction Y. Thus, the lower part of the inner surface 3a of the side plate 3 is formed to be inclined. The side plate 3 is formed such that the outer surface 3b of the side plate 3 extends substantially linearly without being inclined in the height direction Y.

  The sleeper mold 1 to which the present invention is applied, as shown in FIGS. 5 to 7, is a cement-based material such as mortar or concrete, and a face plate 2 and a pair of side plates 3 through a predetermined mold manufacturing process. Will be produced.

  In the sleeper mold 1 to which the present invention is applied, a face plate 2 and a pair of side plates 3 are integrally formed by placing a cement-based material such as mortar or concrete on a mold 8 having a predetermined shape. Is done. In the sleeper mold 1 to which the present invention is applied, the face plate 2 and the side plate 3 are manufactured integrally by placing a fiber-reinforced cement material on the mold 8.

  In the mold manufacturing process, first, as shown in FIG. 5, the mold 8 is constituted by the middle frame 81 and the outer frame 82, and a substantially hollow gap 80 is formed between the middle frame 81 and the outer frame 82. Form. At this time, the outer frame 82 is formed with an opening surface 82a that opens upward. In the middle frame 81, protrusions 83 that protrude from the upper surface 81 a to the opening surface 82 a of the outer frame 82 are formed at two locations in the depth direction Z.

  Next, in the mold manufacturing process, as shown in FIG. 6, fiber reinforced cementitious material is introduced into the gap 80 between the middle frame 81 and the outer frame 82, and fiber reinforcement is performed while applying vibration to the mold 8. Place cement-based material. In the mold manufacturing process, next, after a fiber-reinforced cement-based material is placed on the mold 8, for example, after a predetermined time of about 1 hour has elapsed, the mold 8 is again vibrated.

  At this time, the sleeper mold 1 to which the present invention is applied is placed on the mold 8 after placing a fiber-reinforced cement-based material on the mold 8 and curing it in advance. Before the fiber reinforced cementitious material is hardened, the bubbles inside the fiber reinforced cementitious material placed in the gap 80 of the mold 8 are defoamed by applying vibration to the mold 8 again. Become.

  In the mold production process, after performing primary curing with a curing temperature of about 30 ° C. on the fiber reinforced cementitious material placed in the gap 80 of the mold 8, as shown in FIG. Demold and invert the cured fiber reinforced cementitious material. At this time, the rail fastening device installation hole 5 is formed in the cured fiber-reinforced cement-based material at the position where the protruding portion 83 is formed in the middle frame 81.

  In the mold manufacturing process, finally, by performing secondary curing with the curing temperature set at about 85 ° C., the face plate 2 and the pair of side plates 3 are integrally formed, and fiber reinforced mortar or fiber reinforced concrete is formed. A fiber-reinforced cement-based material such as that exhibits the necessary member strength.

  The sleeper mold 1 to which the present invention is applied has a face plate 2 and a side plate 3 formed of a cement-based material such as a fiber-reinforced cement-based material. As shown in FIG. Used for molding with cementitious materials such as mortar or concrete.

  The sleeper 7 is installed on the ground below the rails laid on the railroad track or the like. As shown in FIG. 8, a rail fastening device 70 for fixing the rails is provided on the top surface 7a of the sleeper 7. Attached to. The rail fastening device 70 is attached to, for example, four locations in the depth direction Z of the sleeper 7 with the front end side of the rail fastening device 70 protruding from the top surface 7 a of the sleeper 7.

  As shown in FIG. 9, in the rail fastening device 70, a through hole 70 a is formed on the distal end side of the rail fastening device 70, and the proximal end side of the rail fastening device 70 is embedded in the cement material that forms the sleeper 7. It is. In the rail fastening device 70, a substrate 70b is provided at the boundary between the distal end side and the proximal end side, and the substrate 70b extends substantially parallel to the top surface 7a of the sleeper 7 in the depth direction Z.

  The sleeper mold 1 to which the present invention is applied is a cement system for forming sleepers 7 in a frame interior 4 formed by being surrounded by a face plate 2 and a pair of side plates 3 as shown in FIGS. The sleeper 7 is manufactured by placing the material and passing through a predetermined sleeper manufacturing process.

  In the sleeper manufacturing process, first, as shown in FIG. 10, a metal gantry 6 such as a steel material is prepared, and the frame interior 4 of the sleeper mold 1 is opened upward. The face plate 2 of the sleeper mold 1 is arranged on the lower side, and the sleeper mold 1 is installed on the gantry 6.

  At this time, in the sleeper mold 1 to which the present invention is applied, the rear surface 2c of the face plate 2 and the outer side surface 3b of the pair of side plates 3 are brought into contact with the gantry 6, and the face plate 2 and the side plate 3 are brought into contact with the metal gantry 6. Fixed. Further, in the sleeper mold 1 to which the present invention is applied, the rail fastening device 70 is inserted into the rail fastening device installation hole 5, and the proximal end side of the rail fastening device 70 is disposed so as to protrude into the inside 4 of the frame.

  Next, in the sleeper manufacturing process, the rail fastening device 70 is fixed by inserting the protruding support member 61 into the through hole 70a on the distal end side of the rail fastening device 70. In the sleeper manufacturing process, the rail fastening device 70 is fixed and, as shown in FIG. 11, a cement material is introduced into the inside 4 of the sleeper mold 1, and cement is applied to the sleeper mold 1 while vibrating. Placing system material.

  At this time, the sleeper mold 1 to which the present invention is applied is the rail fastening device installation hole 5 for attaching the rail fastening device 70 to which the rail is fixed, and the rail fastening device 70 is fixed by the protruding support member 61. At the same time, the base end side of the rail fastening device 70 is disposed so as to protrude into the frame interior 4, and the base end side of the rail fastening device 70 is embedded in the cement-based material put into the frame interior 4.

  In the sleeper manufacturing process, next, as shown in FIG. 12, the cement-based material placed in the frame interior 4 of the sleeper mold 1 is gradually made by performing curing at a predetermined number of times. Harden. In the sleeper manufacturing process, steam curing is performed particularly when the cement-based material placed in the inside 4 of the sleeper mold 1 is cured.

  In the process of steam curing the sleeper 7, high temperature steam is jetted from the outside of the gantry 6 to raise the temperature of the gantry 6 and the sleeper mold 1. At this time, the gantry 6 and the sleeper mold 1 extend so that the gantry 6 becomes a predetermined extension L6 in the depth direction Z, and the sleeper mold 1 extends a predetermined extension in the depth direction Z. Extends to L1 and expands thermally

  In the gantry 6, the extension L6 after the thermal expansion is larger by the predetermined extension length ΔLs at each end in the depth direction Z than the extension L0 in the depth direction Z before the thermal expansion due to the temperature rise. In the sleeper mold 1, the extension L1 after thermal expansion is larger by a predetermined extension length ΔLm at each end in the depth direction Z than the extension L0 in the depth direction Z before thermal expansion due to temperature rise. Become.

  Here, since the metal gantry 6 has a higher thermal conductivity than the sleeper mold 1 made of a cement-based material, the temperature of the metal gantry 6 increases rapidly, and the stretching length due to the thermal expansion of the gantry 6 is high. ΔLs becomes larger than the stretching length ΔLm due to thermal expansion of the sleeper mold 1. In addition, the sleeper 7 is formed of a cement-based material in the same manner as the sleeper mold 1, and therefore has a stretch length ΔLm substantially the same as that of the sleeper mold 1 when thermally expanded in the steam curing process.

  At this time, when the face plate 2 and the side plate 3 are steam-cured after the cement-based material for molding sleepers 7 is placed in the frame interior 4, the thermal expansion of the cement-based material is caused by the metal frame. 6 is accompanied by thermal expansion of the face plate 2 and the side plate 3 without accompanying thermal expansion of 6.

  In the sleeper manufacturing process, finally, as shown in FIG. 13, predetermined steam curing is performed on the cement-based material placed in the inside 4 of the sleeper mold 1, so that members necessary for the cement-based material are obtained. The sleeper 7 is removed from the inside 4 of the sleeper mold 1 with the strength exerted.

  In the sleeper manufacturing process, a plurality of rail fastening devices 70 are attached to the top surface 7a of the sleeper 7 by reversing the sleeper 7 removed from the inside 4 of the sleeper mold 1 as shown in FIG. Thus, the sleeper 7 having a substantially trapezoidal cross section is completed.

  As shown in FIG. 14, the sleeper 7 is such that rails such as railroad tracks are fixed to each rail fastening device 70, and an interval d between adjacent rail fastening devices 70 spaced apart from each other in the depth direction Z. A high accuracy is required for the gradient θ of the top surface 7a of the sleeper 7. Further, the sleeper 7 is required to have a high flatness by setting the unevenness of the top surface 7a of the sleeper 7 to 0.3 mm or less.

  At this time, the sleeper 7 is required to have high accuracy with an allowable error of about 0.4%, for example, for the distance d between the adjacent rail fastening devices 70. The sleeper 7 is formed, for example, at a ratio of the depth direction Z to the height direction Y, with the gradient θ of the top surface 7a being 1/40, but about 1/380 with respect to this gradient θ. Is required to have high accuracy.

  The sleeper mold 1 to which the present invention is applied is required to have high accuracy in the distance d between the adjacent rail fastening devices 70. As shown in FIG. A gap for inserting the projecting support member 61 is formed between the projecting support member 61 and the projecting support member 61. Therefore, in the sleeper mold 1 to which the present invention is applied, each rail fastening device 70 has a depth in the range of a gap through which the protruding support member 61 is inserted when the cementitious material of the sleeper 7 is cured. There is a risk of moving in the direction Z.

  Here, in the sleeper mold 1 to which the present invention is applied, two adjacent rail fastening devices 70 are inserted into the respective rail fastening device installation holes 5 extending in the depth direction Z of the face plate 2. Since the conventional steel mold has a larger thermal conductivity than the sleeper mold 1 of cementitious material, when steam curing is performed after placing the cementitious material for forming sleepers 7 When the sleeper 7 is immature, the steel formwork is instantly extended, so that the sleeper 7 is hardened in a state of high elongation. On the other hand, the sleeper mold 1 to which the present invention is applied is manufactured from a cement-based material and has a slower elongation than a conventional steel mold, and the sleeper 7 is cured in a state of low elongation. The extension in the depth direction Z is suppressed by each rail fastening device installation hole 5.

  At this time, the sleeper mold 1 to which the present invention was applied was inserted adjacent to each rail fastening device installation hole 5 when the cementitious material of the sleeper 7 was cured, as shown in FIG. Two rail fastening devices 70 are restrained in the depth direction Z in each rail fastening device installation hole 5. For this reason, the sleeper mold 1 to which the present invention is applied has two rail fastening devices 70 adjacent to each other in the rail fastening device installation holes 5 because the thermal conductivity in the depth direction Z of the face plate 2 is reduced. , And the distance d between the adjacent rail fastening devices 70 can be suppressed within the allowable error range.

  The sleeper mold 1 to which the present invention is applied is one in which two rail fastening devices 70 inserted adjacent to each other are restrained in the depth direction Z by the respective rail fastening device installation holes 5, and As shown in FIG. 7, the rail fastening device installation hole 5 is formed along the protruding portion 83 of the middle frame 81. At this time, as shown in FIG. 15, the rail fastening device installation hole 5 is constrained by the protruding portion 83 and the like when the cementitious material is cured and contracted, so that the periphery of the rail fastening device installation hole 5 is formed. Internal stress σ is generated.

  As shown in FIG. 15A, the sleeper mold 1 to which the present invention is applied is particularly formed with a corner 5e of the rail fastening device installation hole 5 curved in the in-plane direction of the face plate 2. . As a result, the sleeper mold 1 to which the present invention is applied avoids stress concentration at the corner 5e of the rail fastening device installation hole 5, and the face plate 2 is made of cementitious material. First, as shown in FIG. 15B, it is possible to suppress the occurrence of cracks due to stress concentration as in the case where the corner 5e is formed at a right angle in the in-plane direction.

  The sleeper mold 1 to which the present invention is applied, as shown in FIG. 12, the thermal expansion of the cementitious material, particularly when the cementitious material for molding the sleeper 7 is steam-cured in the frame interior 4, It does not accompany the thermal expansion of the metal gantry 6 but accompanies the thermal expansion of the face plate 2 and the side plate 3. At this time, the sleeper mold 1 to which the present invention is applied has a small heat transfer coefficient of the face plate 2 and the pair of side plates 3, so that the extension in the depth direction Z due to thermal expansion is suppressed, and thus the surface 2 b of the face plate 2. The cementitious material of sleepers 7 can be hardened in the frame interior 4 while maintaining a predetermined gradient.

  For this reason, the sleeper mold 1 to which the present invention is applied maintains a predetermined gradient on the surface 2b of the face plate 2 and hardens the cementitious material of the sleeper 7 in the frame interior 4 as shown in FIG. In addition, the gradient θ of the top surface 7a of the sleeper 7 can be suppressed within the allowable error range. Furthermore, in the sleeper mold 1 to which the present invention is applied, the thermal expansion of the cementitious material of the sleeper 7 does not accompany the thermal expansion of the mount 6 as shown in FIG. As a result, the sleeper 7 can be prevented from being damaged.

  As shown in FIG. 7, the sleeper mold 1 to which the present invention is applied is formed by placing a cement-based material in a gap 80 between the middle frame 81 and the outer frame 82, thereby allowing the face plate 2 and the pair of side plates 3 to be formed. Are integrally formed. For this reason, the sleeper mold 1 to which the present invention is applied can be used repeatedly once the highly accurate mold 8 is manufactured. It can be easily and repeatedly manufactured with accuracy.

  Thus, the sleeper mold 1 to which the present invention is applied is manufactured by repeatedly using the mold 8 with high accuracy, thereby suppressing an increase in the manufacturing cost of the sleeper mold 1, and the sleeper mold 1. 1 can be mass-produced with high accuracy. Further, in the sleeper mold 1 to which the present invention is applied, since the face plate 2 and the pair of side plates 3 are made of a cement-based material, corrosion of a steel member such as a steel mold is not a concern. Thus, the maintainability of the sleeper mold 1 can be improved.

  The sleeper mold 1 to which the present invention is applied is manufactured by removing the hardened cement-based material from the mold 8, and in particular, the face plate 2 and the pair of side plates 3 are manufactured from fiber-reinforced cement-based material. can do. At this time, the sleeper mold 1 to which the present invention is applied is made of a fiber-reinforced cement-based material, thereby exhibiting sufficient strength of the member while reducing the thickness and weight of the face plate 2 and the pair of side plates 3. It becomes possible.

  In the sleeper mold 1 to which the present invention is applied, since the fiber-reinforced cement-based material has a high viscosity, bubbles tend to stay inside the hardened fiber-reinforced cement-based material, and there is a concern that the strength of the member may be reduced. . The sleeper mold 1 to which the present invention is applied, as shown in FIG. 6, before the fiber-reinforced cement-based material is hardened, in particular, the mold 8 is vibrated again. It is possible to avoid a reduction in member strength by defoaming the bubbles.

  As mentioned above, although the example of embodiment of this invention was demonstrated in detail, all the embodiment mentioned above showed only the example of actualization in implementing this invention, and these are the technical aspects of this invention. The range should not be construed as limiting.

1: Sleeper mold 2: Face plate 2a: Both sides 2b: Front surface 2c: Back surface 3: Side plate 3a: Inner side surface 3b: Outer side surface 4: Inside frame 5: Rail fastening device installation hole 5a: Side surface 5b: Step portion 5c : Long side 5d: Short side 5e: Corner 6: Stand 61: Projection support member 7: Sleeper 7a: Top surface 70: Rail fastening device 70a: Through hole 70b: Substrate 8: Formwork 80: Gap 81: Middle frame 81a: Upper surface 82: Outer frame 82a: Opening surface 83: Projection X: Width direction Y: Height direction Z: Depth direction

Claims (5)

A sleeper mold for molding sleepers,
A face plate formed in a substantially flat plate shape, and a pair of side plates extending in the height direction from both sides in the width direction of the face plate,
The face plate and the side plate are made of a cement-based material, and a cement-based material for molding sleepers is placed inside a frame formed by being surrounded by the face plate and the pair of side plates. Yes,
The face plate is provided with a rail fastening device installation hole for attaching a rail fastening device to which the rail is fixed to the sleeper, penetrating from the inside of the frame in the plate thickness direction. The sleeper installation hole according to claim 1, wherein the rail fastening device installation hole is formed to extend in a depth direction of the face plate, and a corner portion of the rail fastening device installation hole is curved. Formwork. The rail fastening device installation holes are provided at a plurality of locations in the depth direction of the face plate, and each rail fastening device is attached to a sleeper with each of the rail fastening device installation holes. The sleeper mold according to claim 1 or 2, wherein the installation hole extends in the depth direction. The face plate and the side plate are manufactured by placing a fiber reinforced cement material on a mold, and after placing the fiber reinforced cement material while applying vibration to the mold, The air bubbles inside the fiber reinforced cementitious material are defoamed by applying vibration to the formwork again before the fiber reinforced cementitious material placed on is hardened. 4. A sleeper mold according to any one of 3 above. The face plate and the side plate are fixed to a metal frame, and are used to mold sleepers when steam curing is performed after placing a cement-based material for molding sleepers inside the frame. 5. The thermal expansion of the cement-based material is accompanied by thermal expansion of the face plate and the side plate without accompanying thermal expansion of the gantry. 5. Formwork for sleepers.

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