KR20150111547A - Wide sleeper for direct fastened track on asphalt roadbed, and constructing method for the same - Google Patents

Abstract

The present invention is to provide a wide sleeper for an asphalt roadbed direct fastened track and a constructing method thereof capable of minimizing the generation stress of an asphalt roadbed by a train load by forming a wide sleeper having a wide lower side than a general sleeper as an asphalt exclusive sleeper for an asphalt roadbed direct fastened track, minimizing the thickness of an asphalt roadbed accordingly, reducing plastic deformation of the asphalt roadbed by lowering the stress generation level, securing the safety and train driving efficiency of a rail by effectively controlling the horizontal force generated in longitudinal and lateral directions after installing a shear strengthening device which is a circular concrete block of high strength concrete on the center of the sleeper, partially correcting a construction error in the asphalt roadbed construction by attaching Geotextile on the lower side of both wide units of the wide sleeper in advance when the wide sleeper is formed and manufacturing the wide sleeper, preventing destruction by stress concentration in advance by evenly transferring the train load to the asphalt roadbed, improving friction resistance between the lower side of the wide sleeper and the asphalt roadbed, and controlling the horizontal force acting on the longitudinal and lateral directions.

Description

TECHNICAL FIELD [0001] The present invention relates to a wide-width sleeper for an asphalt road surface direct-coupled track and a construction method thereof. BACKGROUND OF THE INVENTION 1. Field of the Invention [0002]

More particularly, the present invention relates to an asphalt-dedicated sleeper for a direct-fastened track installed on an asphalt roadbed, wherein both ends of the direct-coupled track are formed in a wide width And to a wide width sleeper for an asphalt road surface direct track capable of fixing a central portion of a sleeper on an asphalt road surface using a shear fixing device, and a method of construction thereof.

Generally, it is well known that a track on which a train or the like travels is provided with an image on a bedrock, and a sleeper and a rail are arranged on the bedrock. Here, the road is made of gravel (or crushed stone) or concrete as a track material serving to widely distribute the load of a train transmitted from a rail and a sleeper to the roadbed, and to fix the sleeper at a predetermined position.

The structure of such a track is generally such that a sleeper is arranged on a road formed on a roadbed, and a pair of rails are attached thereon in parallel at regular intervals. Ballast, slab, etc. are used to form these tracks, and are selected in consideration of various conditions of the route. Particularly, ballast roads using ballast such as gravel and crushed stone are widely known. Such ballast such as gravel, crushed stone and the like can keep the sleepers securely, distribute the load transmitted from the train through the rails and the sleepers evenly to the roadbed, provide elasticity to the track, and perform maintenance work such as damping And it has a function of improving the drainage of the orbit and preventing the generation of pom pom or weed.

On the other hand, as the train speed increases, the trajectory structure gradually changes from the gravel trajectory to the concrete slab trajectory. For example, when a track such as a high-speed railway or the like is laid, the occurrence of a fault in the track becomes a serious problem. In the case of the ordinary gravel road using the gravel, problems such as scattering of gravel during the passage of the train are greatly increased. Therefore, a method of using the slab track of the concrete slab is also considered. However, in the case of such a concrete slab track, there is a disadvantage that it is difficult to maintain the concrete slab track at the time of damage, and that the construction period due to the concrete curing takes a lot of time.

In order to compensate for the disadvantages of the concrete slab track or the concrete track, the development of the asphalt roadbed and the orbit to which the sleeper direct track is applied is proceeding.

Specifically, the asphalt roadbed has a greater plastic deformation of the asphalt material than the concrete roadbed, and therefore, the development of a new asphalt that meets the railroad is required as a countermeasure thereto. In addition, because the modulus of elasticity of asphalt roadbed is low, the occurrence of deformation against working load can be larger than that of concrete roadbed. Therefore, in order to minimize the deformation of the asphalt due to the load, it is necessary to reduce the size of the working load in addition to improving the physical properties of the material.

For example, when comparing the stress on the under side of the sleepers due to the axle load acting on the railway, the wheel load stress of the road is 0.94 MPa, and the stress on the under side of the railroad sleeping side is 0.498 MPa. That is, the stress acting on the asphalt of the road is larger than the stress acting on the lower side of the railway sleepers. This is because the stress acting on the lower surface of the railway sleepers is smaller than that of the roads because the railway is larger than the roads but the ground area due to the sleepers or the slab track is wider than the roads.

Therefore, in order to reduce the asphalt plastic deformation, the stress acting on the upper surface of the asphalt is more important to reduce the stress acting on the upper surface of the asphalt. Sleeper) can be applied to reduce the stress acting on the asphalt upper surface and minimize the deformation amount of the asphalt layer.

Figs. 1A and 1B are views showing a concrete slab track and a sleeper's direct-coupled track, respectively.

The kind of the applicable track on the asphalt roadbed can be largely classified into the concrete slab track 10 shown in FIG. 1A and the sleeper direct track 20 shown in FIG. 1B. Specifically, the concrete slab track 10 is advantageous in securing longitudinal and transverse lateral resistance forces, and has a low risk of buckling, resulting in less occurrence of track misalignment. However, since the initial construction cost is high and the weight is high, And it is disadvantageous that the orbital adjustment is disadvantageous in case of large deformation due to bedrock uneven settlement.

In addition, the sleeper direct-coupled track 20 has advantages of low initial construction cost, low weight and excellent workability, and is advantageous in maintenance of linear or uneven settlement of orbit. However, the shear reinforcement 20 Since the asphalt roadbed is installed at room temperature, it is necessary to consider the plastic deformation due to the viscoelastic behavior of the asphalt roadbed at high temperature. In particular, the asphalt roadbed direct path is a track type that directly connects the sleepers on the asphalt roadbed. It is used to prevent the sleepers from moving against longitudinal and transverse loads acting on the sleepers, such as the longitudinal rail load The shear reinforcement (shear key) is to be installed at the center or end of the sleepers. In addition, if the lifting of the sleepers due to the moving train load causes a significant effect on the train drivability and the derailment of the train, securing the stability of the train operation by securing the horizontal and vertical resistance of the sleepers and preventing the lifting of the sleepers shall.

On the other hand, in Getrac A1 and Getrac A3 sleeper systems, which are applied to asphalt roadside track sleeper in Germany in the past, the asphalt roadbed is punctured to secure the longitudinal and lateral resistance of the sleeper directly connected to the asphalt roadbed, ) Is inserted into the center of the sleeper to be simply joined with the hole.

As a prior art related thereto, Korean Patent No. 10-556182 discloses an invention entitled "wide-width sleepers for Gatrock A3 fixed track ", which will be described with reference to FIG.

Fig. 2 is a view illustrating the use of a shear anchor for securing sleepers and slabs in a recovered orbit according to the prior art.

2, a shear anchor 31 connects the tie rail 60 and the asphalt roadbed 32 to secure sleepers and slabs on the rehabilitated trajectory according to the prior art, and most of the shear anchors 31 are simply nails As shown in FIG. For example, Fig. 2 shows a front anchor 31 of Getrac, Germany. Specifically, a shear anchor 31 is provided at the bottom of the sleeper 33 to provide a simple So that the lateral and longitudinal resistance forces are ensured.

On the other hand, as another prior art, Korean Patent No. 10-704991 discloses an invention entitled "Wide Sleepers for Packing Tracks ", which will be described with reference to FIG.

3 is a view showing a wide sleeper for a packaging track according to the prior art.

Referring to FIG. 3, a conventional wide-width treadmill 40 for a packaging track has a body portion 41 formed into a concrete slab so as to have a rectangular shape; An enlarged portion 42 integrally molded so as to protrude from both ends of the body portion 41 so as to surround both sides and an upper end portion; A fastening device seating part 44 formed on an upper surface of the enlarged part 42 of the body part 41 to receive a fastening device for fastening the rail; And reinforcing bars (43) embedded at both sides of the enlarged portion (42) so as to pass through both sides of the enlarged portion (42) at regular intervals.

In the case of the wide railroad tie railway track 40 according to the prior art, it is possible to reduce the load burden due to the train transmitted to the lower railway slope of the railroad tie by forming the railroad tie that is embedded in the concrete slab of the packing track, Relative displacement between the slab and the slab can be suppressed and the structural stability of the packaging track can be greatly improved.

As described above, in the case of the wide treadmill 40 for a packaging track according to the prior art, the reinforcing bars 43, which are embedded at regular intervals so as to penetrate both sides of the enlarged portion 42, are embedded in the concrete slab Slab track. As described above, the concrete slab track is advantageous in securing horizontal and lateral horizontal resistance, and has a low risk of buckling, which causes less occurrence of track misalignment. On the other hand, since the initial construction cost is high and the workability is poor And the orbital adjustment is disadvantageous in case of large deformation due to bedrock equilibrium settlement.

Korean Patent No. 10-704991 filed on Dec. 7, 2005, entitled "Wide Sleepers for Packing Tracks" Korean Patent No. 10-1266111 filed on November 7, 2012, entitled "Sleepers with an elastic pad for asphalt roadbed & Korean Patent No. 10-556182 filed on Aug. 30, 2002, entitled "Ghetorac A3 Wide Track Sleeping < RTI ID = 0.0 & Korean Patent No. 10-942793 filed on Jan. 10, 2008, entitled "Railway track sleeper equipped with position fixing device" U.S. Patent No. 6,764,022 filed on August 1, 202, entitled "Double Sleeper For GETRAC A3 Fixed Track" Korean Patent No. 10-1052906 filed on December 2, 2010, entitled "Precast slab track system and precast slab track system construction method" Korean Patent Publication No. 2010-452 (Disclosure Date: January 6, 2010), Title of the Invention: "Railway Reinforced Concrete Sleepers"

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems and an object of the present invention is to provide an asphalt specific sleeper for asphalt pavement on an asphalt roadbed, which forms a broad width type sleeper having a width smaller than that of a general sleeper, The present invention provides a wide sleeper for an asphalt road surface direct-coupled track capable of minimizing stress and a method of constructing the same.

It is another object of the present invention to provide a structure in which a height of a central portion of a tread is set to be higher than that of a wide end portion of a tread is used to form an insertion hole into which a shear reinforcement is to be inserted, Which can reinforce the sectional rigidity of the weak point, and a method of constructing the same.

Another object of the present invention is to provide a railroad car which is a round concrete block of high strength concrete by providing a shear reinforcement at a central portion of a treadmill to effectively control lateral forces generated in the longitudinal and lateral directions, And which can be used in a high speed and a general speed region, and a method of constructing the broad sleeper for a direct track of an asphalt roadbed.

Another object of the present invention is to provide a method of manufacturing a wide width treadmill in which a wide width tread is formed by attaching a non-woven fabric (Geotextile) to the bottom of both wide ends of the wide treadmill in advance, thereby correcting a construction error at the time of asphalt roading, The asphalt road surface direct pathway which can control the lateral force acting in the transverse direction and the longitudinal direction by improving the friction resistance between the bottom surface of the wide treadmill and the asphalt roadbed, Wide sleepers and a method of construction thereof.

As a means for achieving the above object, the present invention provides a direct-track railway sleeper installed on an asphalt roadbed, in which an insertion hole into which a shear reinforcement is to be inserted is formed on a lower surface A center of a sleeper; A wide end portion formed on both side surfaces of the treadmill central portion and having a wider width than the width of the treadmill central portion and formed on the upper surface of the rail fastening device seating portion; A perforation hole formed on the asphalt roadbed so as to improve the lateral and longitudinal resistance force along the train running, and a shear reinforcement inserted into the insertion hole formed in the center of the tread; And a nonwoven fabric attached to a lower surface of the wide end portion to improve frictional resistance between the asphalt roadbed and the asphalt roadbed, wherein the center and both wide end portions of the sleeper are precastly formed by integrally casting and curing concrete in a wide treadmill mold .

Here, the height of the center portion of the tread is formed to be higher than the width of both ends of the tread to reinforce the sectional rigidity of a structural weak point generated by forming the insertion hole into which the shear reinforcement is to be inserted, .

Here, the shear reinforcement may be a circular concrete block formed of high-strength concrete.

The wide width sleepers for asphalt road surface direct path according to the present invention may further include elastic pads of neoprene rubber material fastened to the outer peripheral surface of the circular concrete block and inserted into insertion holes formed in the center of the sleepers.

Here, the concrete is inserted and cured in a state in which the PC steel wire is pulled in the wide width tie-down mold so that the PC steel wire is pulled in the tread middle portion and both wide end portions.

Here, the nonwoven fabric may be attached to the bottom surface of the wide end portion of the end portion immediately after the concrete is poured in order to improve the adhesiveness.

According to another aspect of the present invention, there is provided a method of manufacturing a wide treadmill for direct connection of an asphalt road surface directing track, comprising the steps of: a) providing a wide treadmill for direct track of a treadmill central portion and a wide- A precast casting process using the precast casting process; b) attaching a nonwoven fabric to both wide end portions of the wide treadmill for direct track; c) forming a perforation hole for securing the shear reinforcement on the asphalt roadbed; d) tightening an elastic pad on an outer peripheral surface of the upper end of the shear reinforcement; e) inserting the shear reinforcement into an insertion hole formed in a lower portion of the center of a treadle of the wide treadmill for direct track; f) vertically inserting the lower portion of the shear reinforcement into a perforation hole on the asphalt roadbed and aligning the position; g) installing a rail on the rail fastening device formed on the upper surface of the wide end of both ends of the wide treadmill for direct track; And h) injecting a filler into the perforation holes for fixing the shear reinforcement device on the asphalt roadbed surface, wherein both ends of the wide end portions formed on both sides of the center of the tread of the direct tram track for direct track are formed to have a width greater than the width of the tread middle portion .

According to the present invention, the asphalt-dedicated sleepers for asphalt roads on the asphalt roadbed can form a wide-width type sleeper having a width smaller than that of a general sleeper, thereby minimizing the occurrence stress of the asphalt roadbed due to the railroad load. As a result, the thickness of the asphalt roadbed can be minimized and the plastic deformation of the asphalt roadbed can be reduced by lowering the stress level.

According to the present invention, since the height of the center portion of the tread is set to be higher than the widths of the both ends, it is possible to provide a structural weak point caused by forming the insertion hole for inserting the shear reinforcement into the lower surface of the tread middle portion of the tread, Sectional rigidity can be reinforced.

According to the present invention, by optimizing the sleeper height and width source, the weight of the wide sleeper can be reduced by increasing the ratio of the supporting area, thereby improving the workability and economy of the wide sleeper.

According to the present invention, by providing a shear reinforcement device, which is a round concrete block of high strength concrete, at the center portion of a treadmill, it is possible to secure the safety and train running properties of the rail by effectively controlling the lateral force generated in the longitudinal direction and the lateral direction, It can be used in the interval.

According to the present invention, it is possible to compensate the construction error at the time of construction of the asphalt road by partially attaching the non-woven fabric (Geotextile) to the bottom of both wide end portions of the wide width sleepers during formation of the wide width sleepers, It effectively transfers the load to the asphalt roadbed and transfers the load of the train evenly to the asphalt roadbed to prevent the breakdown due to the stress concentration and to improve the friction resistance between the lower widthbed and the asphalt roadbed, Can be controlled.

Figs. 1A and 1B are views showing a concrete slab track and a sleeper-direct-coupled track, respectively.
Fig. 2 is a view illustrating the use of a shear anchor for securing sleepers and slabs in a recovered orbit according to the prior art.
3 is a view showing a wide sleeper for a packaging track according to the prior art.
4 is a view for explaining the concept of a wide sleeper for an asphalt road surface direct path according to an embodiment of the present invention.
FIGS. 5A and 5B are top and bottom views, respectively, of a wide treadmill for an asphalt road surface direct track according to an embodiment of the present invention.
FIG. 6 is a view showing details of a wide sleeper for an asphalt road surface direct path according to an embodiment of the present invention.
FIG. 7 is a diagram for explaining a comparison between a major specification of a wide sleeper for an asphalt road surface direct path and an existing sleeper according to an embodiment of the present invention.
8 is a view showing the shape specification of the wide width sleepers for direct connection of the asphalt roadbed straight line shown in FIG.
9 is a view for explaining a shear reinforcement device in a wide sleeper for an asphalt road surface direct path according to an embodiment of the present invention.
10 is a view for modeling 3D finite element analysis for a wide sleeper for an asphalt road surface direct-coupled track according to an embodiment of the present invention.
11A and 11B are diagrams showing the cross-sectional characteristics, the maximum design moment and the shearing force of the wide-width sleepers for asphalt roadbed direct-coupled tracks according to the embodiment of the present invention, respectively.
12 is a flowchart illustrating an operation method of a wide sleeper for an asphalt road surface direct-coupled track according to an embodiment of the present invention.
13 is a view showing detailed specifications of a mold for manufacturing a wide sleeper for an asphalt road surface direct path according to an embodiment of the present invention.
FIGS. 14A and 14B are photographs showing a mold for manufacturing a wide sleeper for an asphalt roadbed direct path and a wide sleeper for a direct track, respectively, according to an embodiment of the present invention.
FIG. 15 is a vertical cross-sectional view showing a state where a wide width sleeper for an asphalt road surface direct path is installed according to an embodiment of the present invention.
16A and 16B are views showing stress and axial displacement as a result of analysis according to an asphalt road surface thickness according to an embodiment of the present invention, respectively.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

[Wide-width sleepers for asphalt road surface direct-coupled tracks]

FIG. 4 is a view for explaining the concept of a wide sleeper for an asphalt road surface direct-coupled track according to an embodiment of the present invention, and FIGS. 5A and 5B are diagrams for explaining the concept of a wide sleeper for an asphalt road surface direct- FIG. 6A is a plan view, and FIG. 6B is a cross-sectional view of a wide treadmill for an asphalt road surface direct track according to an embodiment of the present invention. 6 is a vertical sectional view, and FIG. 6 (c) is a cross-sectional view taken along line AA in FIG. 6 (a) of FIG. 6, and FIG. 6 (d) is a cross-sectional view taken along line BB in FIG.

4 to 5, the asymmetric broadband treader 100 for direct track of asphalt road surface direct path according to the embodiment of the present invention is a treadmill for direct track installed on an asphalt roadbed, and includes a treadmill central portion 110, The nonwoven fabric 200 further includes a nonwoven fabric 200 that includes the upper end portion 120, the rail fastening device seating portion 130, the shear reinforcement device 140, and the elastic pad 150 and is attached to the bottom surface of the wide end portion 120 .

5B, the treadmill central portion 110 is formed on the bottom surface of the insertion hole 110h into which the front end reinforcing apparatus 140 is to be inserted. 6, the tread middle portion 110 of the wide treadmill 100 for direct track is provided with the front end reinforcement device 140 so as to secure horizontal resistance in the longitudinal and lateral directions, The height of the treadmill central portion 110 may be increased by about 30 mm to reinforce the sectional rigidity. That is, according to the wide treadmill 100 for asphalt road surface direct connection track according to the embodiment of the present invention, by forming the height of the tread middle portion higher than the width of the both end tread portions, the lower end of the tread middle portion of the direct- The cross-sectional rigidity of the structural weak point generated by forming the insertion hole to be inserted can be reinforced.

5A and 5B, the both-end wide portion 120 is formed on both sides of the treadmill central portion 110 and is formed in a wide width that is wider than the width of the treadmill central portion 110 And a rail fastening device seating portion 130 are formed on the upper surface. Here, the treadmill central portion 110 and both end wide portions 120 are precastly formed by integrally casting and curing concrete in the wide treadmill mold 600, as shown in FIG. 13 described later. In addition, the concrete is inserted and cured in a state in which the PC steel wire is tensioned in the wide-width sleeper mold 600 so that the PC steel wire is pulled in the tread middle part 110 and both wide end parts 120. According to the wide width sleeper 100 for an asphalt road surface direct-coupled track according to the embodiment of the present invention, as a sleeper for a direct track on an asphalt roadbed, a width of a sleeper is formed to be wider than that of a general sleeper, It is possible to minimize the generation stress of the roadbed. As a result, the thickness of the asphalt roadbed can be minimized and the plastic deformation of the asphalt roadbed can be reduced by lowering the stress level.

The shear reinforcement device 140 is inserted into the perforation hole formed on the asphalt roadbed 300 and the insertion hole 110h formed in the treadmill central portion 110 so as to improve the lateral and longitudinal resistance force along the train. Here, the shear reinforcement device 140 may be a circular concrete block formed of high-strength concrete. According to an embodiment of the present invention, a wide-width sleeper 100 for an asphalt road surface direct-coupled track is provided with a shear reinforcement device, which is a round concrete block of high-strength concrete, The safety of the rail and the running performance of the train can be ensured.

The elastic pad 150 is a neoprene rubber material. The elastic pad 150 is inserted into the insertion hole 110h formed in the tread central portion 110 by being fastened to the upper peripheral surface of the circular concrete block.

The nonwoven fabric (Geotextile 200) is attached to the lower surface of the wide end portion 120 so as to improve the frictional resistance between the asphalt roadbed 300. The nonwoven fabric 200 is applied to most direct-coupled tracks and is used at the time of increasing frictional force for supporting a horizontal load and at the time of high-level adjustment. In order to improve adhesion, It is preferable to adhere to the bottom surface of the base 120. According to the embodiment of the present invention, the nonwoven fabric 200 is attached to the bottom surface of the wide end portion of the wide treadmill at the time of forming the wide treadmill, so that the construction error at the time of the asphalt roading It is possible to compensate a part of the load on the asphalt roadbed, absorb the impact of the train load, efficiently transmit the load to the lower asphalt roadbed, transmit the load of the train evenly to the asphalt roadbed to prevent destruction due to stress concentration, The frictional resistance between the lower surface and the asphalt road surface can be improved to control the horizontal force acting in the lateral and longitudinal directions.

Meanwhile, the longer the length of the wide treadmill 100 for direct track according to the embodiment of the present invention, the better the load supporting surface. However, considering the economical efficiency and the workability, the same is applied to the current treadmill used at 2,400 mm. It is not.

6, the wide treadmill 100 for direct-coupled track according to the embodiment of the present invention has a diameter D of 200 mm and a depth H of 60 mm so that a shear reinforcement can be installed on the lower portion of the center of the treadmill The insertion hole 110h is provided and the effect of reducing the stiffness at the center section can be minimized by increasing the cross section of about 30 mm to the upper surface of the treadmill central portion 110. Also, in order to prevent cracks from occurring in the wide-width sleepers 100, it is designed to keep all the sides of the wide-width sleepers 100 perpendicular to the bottom surface, and to minimize the damage to the sleeper when carrying and laying Respectively. In addition, the width of the wide-width sleepers 100 maximizes the distribution effect of the load, and 500 mm is applied to both wide ends in consideration of the workability and the central portion of the sleepers is planned to be 400 mm considering the holes for installing the shear reinforcement.

7 is a view for explaining a comparison between the main specifications of a wide sleeper for an asphalt roadbed direct-coupled track and an existing sleeper according to an embodiment of the present invention, and FIG. 8 is a cross- Fig. 8 is a view showing the shape specification of a wide-width sleeper.

As shown in FIG. 7, the direct-track broadband tether 100 according to the embodiment of the present invention, when compared with the Getrac A3 wide tie-down tether used as an asphalt road surface direct-track tether in Germany, The weight of the sleepers can be reduced by lowering the ratio of the supporting area to about 80% to improve the workability and economic efficiency of the sleepers.

9 is a vertical cross-sectional view of a shear reinforcement device in a wide treadmill for an asphalt roadbed direct-coupled track according to an embodiment of the present invention, wherein FIG. 9 (a) FIG. 9B is a photograph of the shear reinforcement device 140, and FIG. 9C is a photograph showing the actually manufactured shear reinforcement device 140. FIG.

In the wide treadmill 100 for asphalt road surface direct-coupled orbitals according to the embodiment of the present invention, by providing the shear reinforcing device, which is a round concrete block of high-strength concrete, on the treadmill central portion 110, the lateral force generated in the longitudinal direction and the lateral direction can be effectively The safety of the rail 400 and the train running ability can be ensured.

As shown in FIG. 9, the height H of the circular concrete block is 160 mm so as to sufficiently resist the horizontal shear stress in consideration of the height integrated with the asphalt road bed 300, and the diameter D Was applied to the structure 200 mm as a result of the structural examination in consideration of the horizontal force acting on the shear reinforcement device 140. As shown in FIG. 9A, 100 mm from the lower surface of the circular concrete block is inserted into a perforation hole previously punched in the asphalt roadbed 300 to fill the non-shrinkage mortar, which is the filler material 160, , And the upper surface of 60 mm is inserted in the lower surface of the sleeper to serve to resist horizontal and vertical horizontal forces. An elastic pad 150 is provided on the inner side of the upper surface of the shear reinforcement device 140 and the inner surface of the insertion hole 110h formed in the lower surface of the treadmill central portion 110 to buffer the magnitude of the applied load during horizontal force, So that it can resist sudden impact loads.

10A and 10B are diagrams for modeling 3D finite element analysis for a wide-width sleeper for an asphalt roadbed direct-coupled track according to an embodiment of the present invention. FIGS. 11A and 11B are cross- Sectional shape, maximum design moment and shear force of a wide track rail track.

10A and 11B are diagrams showing a model of a wide sleeping structure for an asphalt direct-coupled track in a three-dimensional finite element, and Figs. 11A and 11B respectively show cross-sectional characteristics and maximum design moments of an asymmetric broadband sleeping track for an asphalt- According to the embodiment of the present invention, according to the wide width sleeper 100 for asphalt road surface direct connection track, a shear reinforcement device, which is a round concrete block of high strength concrete, is installed at the center of a sleeper, The lateral force generated can be effectively controlled to secure the safety of the rail and the running performance of the train, and can be used in the high speed and the general speed range. In addition, when the wide-width sleepers are formed, the non-woven fabric 200 is pre-attached to the bottom of both wide ends of the wide-width sleepers to partially compensate for the error in the construction of the asphalt roads, and the load of the train is evenly distributed to the asphalt roadbed, And it is possible to improve the frictional resistance between the lower surface of the wide treadmill and the asphalt roadbed, thereby controlling the lateral force acting in the lateral direction and the longitudinal direction.

[Construction method of wide sleepers for direct connection of asphalt road surface]

12 is a flowchart illustrating an operation method of a wide sleeper for an asphalt road surface direct-coupled track according to an embodiment of the present invention.

12, a method of constructing a wide treadmill for a direct track on an asphalt roadbed comprises a treadmill central portion 110 and a wide end portion at both ends (100) of a direct-coupled track composed of a plurality of grooves (120) is precastly manufactured using a mold (600) (S110). At this time, both end wide width portions 120 formed on both sides of the treadmill central portion 110 of the wide treadmill 100 for direct connection track are formed to have a wide width larger than the width of the treadmill central portion 110, respectively. The lower end of the treadmill central portion 110 is formed to reinforce the structural rigidity of a weak point caused by forming the insertion hole 110h into which the front end reinforcing apparatus 140 is inserted. May be formed to have a height higher than that of the both end wide portions 120. In addition, the concrete can be placed and cured in a state in which, for example, sixteen strands of PC steel wire are stretched in the wide-width tie-down mold 600 so that the PC steel wire is embedded in the tie-line central portion 110 and the wide- .

Next, the nonwoven fabric 200 is attached to the wide end portions 120 of the wide treadmill 100 for direct-coupled orbitals (S120). At this time, it is preferable that the nonwoven fabric 200 is attached to the bottom surface of the wide end portion 120 immediately after the concrete is poured in order to improve the adhesiveness.

Next, a perforation hole for fixing the shear reinforcement device 140 is formed on the asphalt roadbed 300 (S130).

Next, the elastic pad 150 is fastened to the outer peripheral surface of the upper end of the shear reinforcement device 140 (S140). The elastic pad 150 is a neoprene rubber material. The elastic pad 150 is fastened to the outer peripheral surface of the upper portion of the circular concrete block, And may be inserted into the insertion hole 110h formed in the central portion 110. [

Next, the front end reinforcing apparatus 140 is inserted into the insertion hole 110h formed at the lower portion of the treadmill central portion 110 of the wide treadmill 100 for direct-coupled orbit (S150).

Next, the lower portion of the front end reinforcing apparatus 140 is vertically inserted into the perforation holes on the asphalt roadbed 300, and the positions are aligned (S160).

Next, the rails 400 are installed on the rail fastening apparatus 500 formed on the upper end of the wide end portion 120 of the wide treadmill 100 for direct-coupled trajectory (S170).

Next, the filler material 160, that is, the non-shrinkage mortar is injected into the perforation hole for fixing the shear reinforcement device on the asphalt roadbed 300 (S180).

13A and 13B are views showing detailed specifications of a mold for manufacturing a wide sleeper for an asphalt road surface direct track according to an embodiment of the present invention. FIGS. 14A and 14B are views showing the asphalt road surface profile These are photographs showing molds for making wide sleeper for direct track and wide sleeper for direct track.

As shown in FIG. 13, in order to manufacture a sleeper prototype by applying the shape and cross-sectional dimensions of the wide-width sleeper determined based on the structural analysis of the wide-width sleeper 100 for direct-coupled track according to the embodiment of the present invention, (600). At this time, the wide-width sleeper mold 600 can be manufactured in a single-mold form, and when the wide-width sleeper mold 600 is manufactured, the concrete can be subjected to compaction and shock during vibration, And shall be made very precise to ensure that the dimensions of the product prior to embedding and the dimensions of the product are accurate.

13 (b) is a vertical cross-sectional view, and Fig. 13 (c) is a side sectional view. As described above, the asphalt road surface direct connection raceway The width of the wide width sleeper 100 is 500 mm, the length of 2,400 mm and the height of 180 mm. The nonwoven fabric 200 is attached to increase the frictional force with the asphalt surface in comparison with the existing sleepers, The width of the sleepers is widened so as to effectively distribute the size of the train load transmitted to the asphalt roadbed.

At this time, a hole 110h is formed in the treadmill central portion 110 of the wide treadmill 100 for direct track for inserting the shear strengthening device 140 for increasing longitudinal and lateral resistance. In order to optimize the sectional efficiency of the direct-track wide-width sleeper 100 according to the embodiment of the present invention, the pre-cast is made of PC sleeper, and a total of sixteen 2.9㎜ * 3 Stranded wire is buried and tensioned.

The direct-track broadband sleeper 100 according to the embodiment of the present invention is a work for making a high-strength concrete product by assembling a PC steel wire, a stirrup, and a pre-filler in a mold using concrete as a base material, Since the standard must be adhered to, it is possible to set the following criteria for wide-width concrete sleeper production.

The compressive strength of the concrete of the wide tie railway track 100 for direct track according to the embodiment of the present invention should be secured at a design reference strength fck = 50 MPa or more of the sleeper and the flexural strength (at 28 days of age) The predetermined strength should be 50 MPa or more.

14A, a total of 16 stranded 2.9 mm * 3 stranded strand wires in the direct-track broadband sleeper 100 are PC stranded wires, and the PC stranded wire is KS D 7002 (PC stranded wire and PC stranded wire stranded wire) ), The yield point ≥33.8 kN and the tensile strength ≥38.2 kN. At this time, pre-tension is applied to each PC steel wire by tensioning with the same tensile force before the pre-tensioning so that the tensile force can be uniformly transmitted to the PC steel wire. In addition, the PC steel wire is prestressed for more than 20 minutes at least 80% of the initial tensile force as a design load, and is then released. However, the design load (initial tension) is 3.12tonf, the PC steel wire is 2.9mm 3 stranded wire, 16 strand standard and follows KS D 7002. In addition, all of the twelve strands of the PC strand should be uniformly strained, and the ends of the sleepers to be manufactured by the pre-tensioning method should be cut so that the PC strands are perpendicular to the bottom of the sleepers.

In addition, in order to manufacture the wide tie railway track 100 for direct track according to the embodiment of the present invention, the concrete is laid in the wide tie railway mold 600. The concrete pouring is completed within one hour after the tie- The concrete temperature should be within 10 ~ 30 ℃ when pouring. At this time, it is necessary to sufficiently tighten the material so as not to cause material separation so as to become dense concrete, and to prevent the attached material from being assembled inside the mold 600 when the concrete is poured and compacted.

Next, in order to manufacture the wide tie railway track 100 for direct track according to the embodiment of the present invention, the nonwoven fabric 200 is attached to the bottom surface of both wide ends of the concrete immediately after the concrete is poured to improve the adhesiveness, The upper surface and side surface of the substrate 100 should be smoothly finished, and the corner portions should be precisely formed in the shape and dimensions shown in the detailed drawing.

Next, curing is carried out for the manufacture of the wide-width sleeper 100 for direct-coupled track according to the embodiment of the present invention. For example, the poured concrete is immediately covered with the curing cover to block direct sunlight, It should be protected from sudden temperature changes to prevent drying. At this time, the curing temperature should not exceed 55 ° C, and the curing time should be the time at which the concrete strength reaches 50% at a relative humidity of 60%. Also, the curing space should be provided so as not to cause a sudden temperature change and a local temperature difference or a temperature change, and the wide treadmill 100 for a direct track according to the embodiment of the present invention is configured such that, as shown in FIG. 14B, After demolding from the sleeping mold 600, the surface should not be exposed to abrupt temperature change, drying, or the like.

Meanwhile, FIG. 15 is a vertical sectional view showing a state in which a wide sleeper for an asphalt road surface direct-coupled track is installed according to an embodiment of the present invention.

As shown in FIG. 15, as shown in FIG. 15, an asymmetric railway sleeper for a direct track on an asphalt roadbed 300 according to an embodiment of the present invention, as shown in FIG. 15, It is possible to minimize the generation stress of the asphalt roadbed 300 due to the train load by forming the sleepers, thereby minimizing the thickness of the asphalt roadbed 300 and lowering the level of stress generation to reduce the plastic deformation of the asphalt roadbed .

16A and 16B are views showing stress and axial displacement as a result of analysis according to the asphalt road surface thickness according to the embodiment of the present invention, respectively.

In order to investigate the variation of the stress occurring in the wide - width sleepers according to the variation of the thickness of the asphalt roadbed, the height of the sleepers was fixed and the analysis was performed with the height of the asphalt layer as a variable. The wide-width sleepers 100 were modeled at a height of 180 mm as described above, and the analysis was performed by changing the height of the asphalt roadbed 300 to 150 mm, 200 mm, 250 mm, and 300 mm. Also, in order to investigate the displacement and stress of the asphalt roadbed according to the model characteristics of the asphalt roadbed 300, the asphalt roadbed is analyzed by applying the elasticity model and the viscoelastic model, and then the maximum tensile stress and the maximum compression The difference in stress was examined.

16A, in the case of the elastic model, as the thickness of the asphalt road bed 300 increases, the maximum tensile stress and the maximum tensile stress of the wide tie rail 100 for direct track according to the embodiment of the present invention, The compressive stress tends to increase. Further, in the case of the viscoelastic model, although the stress is small, the maximum tensile stress and the maximum compressive stress increase as the thickness of the asphalt roadbed 300 increases.

As shown in FIG. 16B, the maximum generated displacement of the asphalt roadbed 300 according to the thickness variation of the asphalt roadbed 300 increases as the thickness of the asphalt roadbed 300 increases, And the value increased. In addition, the viscoelastic model of the asphalt roadbed 300 shows that the maximum tensile stress, the maximum compressive stress, and the maximum generated displacement are smaller than those of the elastic model.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100: Wide sleeper for direct track
110: Central part of the sleepers
120: wide end portion at both ends
130: Rail fastening device seat part
140: Shear reinforcement (circular concrete block)
150: elastic pad (neoprene rubber)
160: Filler (grouting filler)
200: Non-woven fabric (Geotextile)
300: Asphalt roadbed
400: rail
500: Rail fastening device
600: Wide width sleeper mold

Claims (10)

Claims [1] A direct-coupled railway sleeper installed on an asphalt roadbed,
A tread middle 110 formed at the bottom of the insertion hole 110h into which the shear reinforcement device 140 is to be inserted;
The rail fastening device seating part 130 is formed on both side surfaces of the treadmill central part 110 and has a width greater than the width of the treadmill central part 110. The rail fastening device seating part 130 has both end wide parts 120 formed on the upper surface, ;
A perforation hole formed on the asphalt roadbed 300 to improve the lateral and longitudinal resistance force along the train running, and a shear reinforcement device 140 inserted into the insertion hole 110h formed in the treadmill central portion 110; And
The nonwoven fabric 200 attached to the lower surface of the wide end portion 120 to improve the frictional resistance between the asphalt roadbed 300,
Wherein the wick center section (110) and both end widening sections (120) are precasted by pouring and curing concrete into the wide width sleeper mold (600), wherein the wide width sleepers . The method according to claim 1,
The tread portion 110 is formed so as to reinforce the sectional rigidity of a structural weak point generated by forming the insertion hole 110h into which the front end reinforcing apparatus 140 is inserted, Is formed to be higher than the both-end wide portion (120). The method according to claim 1,
Wherein the shear reinforcement device (140) is a circular concrete block formed of high-strength concrete. The method of claim 3,
Further comprising an elastic pad (150) of neoprene rubber material fastened to the outer peripheral surface of the circular concrete block and inserted into the insertion hole (110h) formed in the tread central portion (110). The method according to claim 1,
Wherein the concrete is laid and cured in a state in which the PC steel wire is tensioned in the wide width tie-down mold (600) so that the PC steel wire is pulled in the tie middle part (110) and both wide end parts (120) Wide track sleeper for track. The method according to claim 1,
Wherein the nonwoven fabric (200) is attached to the bottom surface of the wide end portion (120) immediately after the concrete is poured in order to improve the adhesiveness. CLAIMS 1. A method of constructing a wide sleeper for a direct track on an asphalt roadbed,
a) precast making a wide treadmill (100) for a direct track including a treadmill central portion (110) and both end wide portions (120) by using a wide treadmill mold (600);
b) attaching the nonwoven fabric (200) to the wide end portions (120) of the wide treadmill (100) for direct track;
c) forming a perforation hole for fixing the shear reinforcement device 140 on the asphalt roadbed 300;
d) tightening the elastic pad (150) on the outer peripheral surface of the upper end of the shear reinforcement device (140);
e) inserting the front end reinforcement device 140 into the insertion hole 110h formed in the lower portion of the treadmill central portion 110 of the wide treadmill 100 for direct connection orbit;
f) vertically inserting the lower portion of the front end reinforcing apparatus (140) into a perforation hole on the asphalt roadbed (300) and aligning the positions;
g) installing a rail (400) on a rail fastening device (500) formed on the upper surface of the wide end portion (120) of the wide treadmill (100) for direct track; And
h) injecting the filler material (160) into the perforation hole for fixing the shear reinforcement device on the asphalt roadbed (300)
, ≪ / RTI &
The wide width portion 120 formed on both sides of the tread central portion 110 of the wide treadmill 100 for direct connection track is formed to have a wide width greater than the width of the treadmill central portion 110. [ A method of construction of wide sleepers for direct track. 8. The method of claim 7,
In the step (a), the bottom surface of the treadmill central portion 110 may be provided with a treadmill to reinforce the sectional rigidity of a structural weak point generated by forming the insertion hole 110h into which the front end reinforcing apparatus 140 is inserted, Wherein the height of the center portion (110) is higher than the width of the end portions (120) of the both ends. 8. The method of claim 7,
The concrete is laid and cured in a state in which the PC steel wire is tensioned in the wide-width tie-down mold 600 so that the PC steel wire is pulled and buried in the tide middle part 110 and both wide end parts 120 in step a) A method of constructing a wide sleepers for asphalt - bedside direct - coupled tracks. 10. The method of claim 9,
The nonwoven fabric 200 in the step b) is attached to the bottom surface of the wide end portion 120 immediately after the concrete is poured in order to improve the adhesiveness,
Wherein the shear reinforcement device 140 in the step d) is a circular concrete block formed of high strength concrete and the elastic pad 150 is attached to the insertion hole 110h as a neoprene rubber material. A method of construction of wide sleepers for direct track.

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