JP2004324245A - Floating ladder sleeper, floating ladder track, and laying method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a floating ladder track which enables a permanent form to function as a form, when the permanent form is inserted between a longitudinal beam of a floating ladder sleeper and a base thereof so that concrete can be placed, and which enables a vibration-proof material to exert a vibration-proof function without being affected by the permanent form, when a vehicle travels after the completion of the track. <P>SOLUTION: This floating ladder track comprises the vibration-proof material 55 and a buffer material 57, which are intermittently provided on the undersurface and side surface of the longitudinal beam 51, and the permanent form 61 which is provided in a part except the vibration-proof material and the buffer material, on the undersurface and side surface of the longitudinal beam 51. The permanent form 61, which supports the weight of a body of the floating ladder sleeper 5 and a rail 50 almost without being deformed, is as greatly/more greatly deformed as/than the vibration-proof material 55 and the buffer material 57, when the vehicle travels on the rails 50. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a floating ladder sleeper, a floating ladder track, and a method of laying the same.
[0002]
[Prior art]
In a conventional track using a horizontal sleeper, the ballast buffer pressure locally increases because the rail is intermittently supported. For this reason, there is a possibility that the track may be disturbed due to the influence of the repetition of each wheel due to the train load.
[0003]
When the track deviation becomes large, the sway of the train increases and the ride quality is reduced. For this reason, there was a problem that maintenance work had to be performed periodically in a relatively short period of time.
[0004]
Therefore, a ladder sleeper track that improves the dispersibility of the train load and efficiently absorbs the impact force and vibration caused by the train has been proposed.
[0005]
In this ladder sleeper track, a ladder sleeper is laid under a pair of rails instead of a horizontal sleeper. There are two types of ladder sleepers, a ballasted sleeper that is installed on a ballast laid on the roadbed, and a floating ladder sleeper that is installed on the roadbed without using ballast.
[0006]
FIG. 15 shows a floating ladder sleeper 1 (for example, see Patent Document 1). The floating ladder sleeper 1 includes a pair of concrete vertical beams 6 extending along the longitudinal direction of the pair of rails, and a plurality of joint members 9 connecting the vertical beams 6.
[0007]
The floating ladder sleeper 1 includes a polyurethane 29 made of an elastic material intermittently arranged at predetermined intervals on the lower surface of the vertical beam 6 and at least one of the outer rail side and the inner rail side of the vertical beam 6, in this example. A sleeper protrusion 30 protruding to the outer rail side, and a polyurethane 32 made of an elastic material provided between the roadbed protrusion 31 and the vertical beam 6 provided near the sleeper protrusion 30 and between the roadbed protrusion 31 and the sleeper protrusion 30. Have.
[0008]
The vertical beam 6 of the floating ladder sleeper 1 is installed via a polyurethane 29 on a base (mortar base) 28 provided on a roadbed, as shown in FIG. An interval d1 is formed between the vertical beam 6 of the floating ladder sleeper 1 and the pedestal 28. That is, the entire floating ladder sleeper 1 is supported only by the polyurethane 29.
[0009]
FIG. 17 shows an example in which a pedestal 33 having an L-shaped cross section is provided along the entire length of the floating ladder sleeper 1 instead of the pedestal 28 and the roadbed projection 31.
[0010]
As shown in FIG. 18, the pedestal 33 has a horizontal portion 33a that supports the lower surface of the vertical beam 6 and a vertical portion 33b that supports the side surface of the vertical beam 6. An interval d1 is provided between the vertical beam 6 and the horizontal portion 33a of the pedestal 33. The polyurethane 29 is intermittently provided within the interval d1.
[0011]
As shown in FIG. 17, the vertical portion 33b of the pedestal 33 is provided so as to avoid the sleeper protrusion 30. That is, the vertical portions 33 b of the pedestal 33 are provided on both sides of the sleeper projection 30.
[0012]
The both sides of the sleeper projection 30 are supported by the vertical portions 33b of the pedestals 33 on both sides via the polyurethane 32.
[0013]
In addition, a space d2 is provided between the side surface of the vertical beam 6 and the vertical portion 33b of the pedestal 33. The polyurethane 34 is provided in a portion corresponding to the joining material 9 within the interval d2. The polyurethane 32 is also provided at the root of the sleeper projection 30 within the interval d2.
[0014]
The floating ladder track using such a floating ladder sleeper 1 can significantly reduce the time required for maintenance as compared to a track using a horizontal sleeper. In addition, the train has excellent load dispersibility, and has an effect of reducing noise and vibration.
[0015]
By the way, when constructing the floating ladder track (see FIGS. 16 and 18), assembling the reinforcing bars of the pedestals 28 and 33 on the roadbed, installing the floating ladder sleeper 1 and the rails, setting the planned rail level, and setting the pedestal 28 , 33 are assembled in the order of assembling, concrete pouring, curing, demolding, and adjusting the final planned rail level.
[0016]
When the pedestals 28 and 33 are formed by casting in place after the floating ladder sleeper 1 is installed in this way, intervals d1 and d2 are formed between the vertical beam 6 of the floating ladder sleeper 1 and the pedestal 33, and the intervals d1 and d2 are formed. In order to provide polyurethane 29, 32, and 34 in d2, when assembling the wooden formwork, a core is provided in a portion corresponding to the intervals d1 and d2, and after the concrete is cast, the core is removed. There is a need to.
[0017]
However, there is usually only a narrow gap below and to the side of the floating ladder sleeper 1, and it is difficult to remove the core provided between the longitudinal beam 6 and the pedestals 28 and 33 from the outside after the concrete is cast. Have difficulty.
[0018]
Therefore, conventionally, a core made of styrofoam was provided on the lower surface and side surfaces of the floating ladder sleeper 1 before casting concrete, and after the concrete was cast, the core was removed by dissolving it with limonene liquid. .
[0019]
The reason for removing the Styrofoam core after concrete casting is that if the core is left as it is, deformation of the polyurethane 29, 32, 34 will be hindered by the core when the vehicle runs on the rails after the track is completed. This is because the anti-vibration function cannot be exhibited effectively.
[0020]
As is well known, limonene is a main component of orange oil contained in citrus peels such as oranges and lemons. This limonene has the property of dissolving styrene.
[0021]
[Patent Document 1]
JP 2001-214402 A
[0022]
[Problems to be solved by the invention]
However, in the conventional method of laying the floating ladder track, it is difficult to completely dissolve and remove the styrofoam core with the limonene liquid, and there is a problem that part of the styrofoam remains.
[0023]
In this case, the remaining Styrofoam may interfere with the anti-vibration function of the polyurethane 29, 32, 34. Therefore, it is necessary to completely remove the styrofoam. However, this requires a large number of man-hours and increases the cost.
[0024]
In addition, the styrene foam melted by the limonene liquid is liquefied, and the liquefied styrene foam may flow out.
[0025]
On the other hand, there is a request to lay a floating ladder track on a bridge using a PC (Pressed Concrete) girder. In this case, it is necessary to fix the pedestal of the floating ladder track to the PC girder.
[0026]
However, finish concrete such as drainage gradient concrete is usually cast on the PC girder, and since the finish concrete is thin, it is not possible to fix the reinforcing steel in the pedestal.
[0027]
Further, since the PC girder is prestressed, it is not preferable to provide the PC girder with an anchor or the like for fixing a reinforcing bar in the pedestal. It is conceivable to provide an anchor or the like in advance when manufacturing a PC girder at a factory, but in this case, since the position of the anchor is fixed, there is little freedom when laying a floating ladder track on site. Problem arises.
[0028]
Therefore, it is demanded that the pedestal of the floating ladder track be easily fixed by using a portion other than the PC girder.
[0029]
The present invention has been made in view of such a problem, and it is possible to reduce the number of working steps during laying and to easily fix a floating ladder sleeper, a floating ladder track and a floating ladder track which can be easily fixed on a bridge without affecting a PC girder. The task is to provide a laying method.
[0030]
[Means for Solving the Problems]
The present invention employs the following means in order to solve the above problems.
[0031]
That is, the present invention provides a pair of vertical beams arranged below the pair of rails over the entire length of the rails, a joining material connecting the pair of vertical beams, and intermittently provided on a lower surface of the vertical beams. In the floating ladder sleeper provided with a vibration damping material and a cushioning material intermittently provided on the outer rail side of the vertical beam, a portion of the lower surface of the vertical beam excluding the vibration insulating material, And, provided with a discarded form provided substantially without a gap in a portion of the side surface of the vertical beam except for the cushioning material, the discarded form does not substantially deform the weight of the floating ladder sleeper body and the rail. When supporting and supporting the weight of the vehicle traveling on the rails, the weight of the vehicle is deformed to be greater than or equal to the deformation amount of the vibration isolator or the cushioning material.
[0032]
Further, the present invention provides a method of laying a floating ladder track having a concrete pedestal provided on a roadbed, a floating ladder sleeper installed on the pedestal, and a pair of rails installed on the floating ladder sleeper. In the structure, the floating ladder sleeper has a pair of vertical beams arranged under the pair of rails over the entire length of the rails, and a joining material connecting the pair of vertical beams, and the pedestal is It has a horizontal portion provided at intervals below the vertical beam, and a vertical portion provided at intervals on the side surface of the vertical beam, and the interval between the vertical beam and the horizontal portion is intermittent. A cushioning material intermittently provided at an interval between the vertical beam and the vertical portion; and a portion of the interval between the vertical beam and the horizontal portion excluding the anti-vibration material. Established in A discarded formwork, and a discarded formwork provided at a portion of the space between the vertical beam and the vertical portion except for the cushioning material, wherein the discarded formwork comprises the floating ladder sleeper and the rail. When supporting the weight of the vehicle traveling on the rails, it is deformed more than the deformation amount of each of the vibration damping materials without substantially deforming when supporting the weight of the vehicle.
[0033]
Here, in the mold frame, a polyurethane foam and a foamed polyethylene foam are laminated in two layers, the polyurethane foam is arranged on the longitudinal beam side, and the foamed polyethylene foam is arranged on the pedestal side.
[0034]
Also, the present invention provides a floating ladder sleeper having a pair of vertical beams installed under a pair of rails and a joining material connecting the pair of vertical beams on a roadbed, and the floating ladder sleeper is mounted on the roadbed. Before or after installing on the roadbed, intermittently provide a vibration isolating material on the lower surface of the vertical beam, provide a buffer material intermittently on the side surface of the vertical beam, provide a form around the floating ladder sleeper, In the method of laying a floating ladder track for forming concrete to form a pedestal supporting the floating ladder sleeper by casting concrete in the formwork, the vertical beam is provided before or after the formwork is provided around the floating ladder sleeper. The floating ladder sleeper is provided on a portion of the lower surface of the vertical beam excluding the vibration isolating material and on a portion of the side surface of the longitudinal beam excluding the cushioning material. And supporting the weight of the rail without substantially deforming, and when supporting the weight of the vehicle traveling on the rail, providing a discarded frame that deforms more than the deformation amount of each vibration isolator without gaps, Concrete is poured into a space surrounded by the formwork, the formwork frame and the vibration isolator, and the formwork is removed after a predetermined period of time with the formwork form remaining.
[0035]
Further, the present invention is a method of arranging a plurality of PC girders in parallel in a direction intersecting with the longitudinal direction of the rail, and laying the floating ladder track on the PC girders, A gap is provided in the gap, a filling member is filled in the gap, an anchor is provided on the filling member, and a reinforcing bar in the pedestal is connected to the anchor.
[0036]
Here, a beam member protruding from the pedestal in a direction intersecting the longitudinal direction of the rail can be provided, and a reinforcing bar in the pedestal can be extended inside the beam member.
[0037]
Further, the anchor can be embedded in the beam member.
[0038]
In the present invention, the floating ladder track is constructed because the vibration damping material and the cushioning material are provided on the lower surface and the side surface of the vertical beam of the floating ladder sleeper, and the discarded frame is provided without a gap in a portion excluding these vibration damping materials. When casting concrete for forming the pedestal, there is no need to provide a core for providing an interval between the vertical beam and the pedestal.
[0039]
In addition, since the discarded form supports the weight of the floating ladder sleeper and the rail without substantially deforming, when the concrete is cast to form the pedestal, the discarded form serves as the form.
[0040]
When the vehicle runs on the rails after the track is completed, the damping form deforms more than the deformation of the vibration isolator or cushioning material. Can be demonstrated.
Further, when the scrap frame is formed of two layers of a polyurethane foam and a foamed polyethylene foam, these materials can be easily obtained from the market, so that the cost can be reduced.
[0041]
In addition, when laying a floating ladder track on a bridge using a PC girder, an anchor was provided in the filling material between the PC girder, and the reinforcing steel in the pedestal and the beam member was connected to this anchor. The floating ladder trajectory can be fixed without performing.
[0042]
The above-described components and steps can be combined with each other without departing from the spirit of the present invention.
[0043]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
[0044]
(1st Embodiment)
[0045]
FIG. 1 shows a floating ladder sleeper 5 according to an embodiment of the present invention. This floating ladder sleeper 5 has a pair of vertical beams 51 disposed under the pair of rails 50 over the entire length of the rails 50, and from these vertical beams 51 to the outer or inner rail side, in this example, It has a sleeper projection 52 protruding to the outer rail side and a joining material 53 connecting the pair of vertical beams 51. Reference numeral 81 in FIG. 1 denotes a fixture for fixing the rail 50 to the vertical beam 51.
[0046]
As shown in FIG. 2, on the lower surface 54 of the above-mentioned vertical beam 51, an anti-vibration member 55 provided intermittently is provided. In this example, the vibration isolator 55 is formed of polyurethane, but an elastic member other than polyurethane, such as elastic rubber, may be used.
[0047]
Further, as shown in FIG. 3, in the lower surface 54 of the vertical beam 51 except for the vibration isolator 55, a discarded frame 61 is provided without a gap.
[0048]
The discarded frame 61 supports the weight of the floating ladder sleeper 5 and the rail 50 without substantially deforming the same, and also supports the weight of the vehicle running on the rail 50 when deforming the vibration isolator 55. It is formed of a member that is deformed as described above.
[0049]
In this example, as shown in FIG. 4, the disposable mold frame 61 has a polyurethane foam 62 and a foamed polyethylene foam 63 laminated in two layers. In this example, a foamed polyethylene foam 63 foamed about 30 times is used.
[0050]
Since the polyurethane foam 62 and the foamed polyethylene foam 63 can be easily obtained on the market, the cost can be reduced.
[0051]
As shown in FIG. 1, a cushioning material 57 is intermittently provided on the outer rail side of the vertical beam 51, that is, on the side surface 56 on the sleeper projection 52 side.
[0052]
In addition, cushioning members 60 are provided on both side surfaces 58 and 59 of the sleeper projection 52 in the longitudinal direction of the longitudinal beam 51.
[0053]
These cushioning members 57 and 60 are also formed of polyurethane, but elastic members other than polyurethane can also be used.
[0054]
Further, as shown in FIG. 5, on the side surface of the vertical beam 51 on the sleeper projection 52 side, except for the cushioning material 57, a cut-out frame 61 is provided with almost no gap.
[0055]
This disposable frame 61 also has a polyurethane foam 62 and a foamed polyethylene foam 63 laminated in two layers in the same manner as described above (see FIG. 4).
[0056]
As described above, the floating ladder sleeper 5 of the present invention is provided with the vibration isolator 55 and the cushioning material 57 on the lower surface 54 and the side surface 56 of the longitudinal beam 51, and in the portion excluding the vibration isolator 55 and the cushioning material 57. , And the disposable frame 61 was provided without any gap.
[0057]
For this reason, when laying the floating ladder track 7 (see FIG. 6), when laying concrete for forming the pedestal 71, it is necessary to form the gaps d3 and d4 between the vertical beam 51 and the pedestal 71. There is no need to have children. Therefore, the construction of the floating ladder track 7 is facilitated.
[0058]
(Second embodiment)
[0059]
Next, the floating ladder track 7 using the floating ladder sleeper 5 will be described with reference to FIG. The same parts as those in FIGS. 1 to 5 are denoted by the same reference numerals, and detailed description is omitted.
[0060]
FIG. 6 shows a floating ladder track 7 according to the second embodiment of the present invention. The floating ladder track 7 includes a concrete pedestal 71 provided on a roadbed 70, a floating ladder sleeper 5 installed on the pedestal 71, and a pair of rails 50 installed on the floating ladder sleeper 5 ( FIG. 7).
[0061]
The floating ladder sleeper 5 has the same configuration as that of FIG. The pedestal 71 is provided below the pair of vertical beams 51 of the floating ladder sleeper 5, as shown in FIG.
[0062]
The pedestal 71 is provided over the entire length of the track. Further, the pedestal 71 has a horizontal portion 72 provided below the vertical beam 51 at a distance d3 and a vertical portion 73 provided at a distance d4 from the side surface of the vertical beam 51. . The horizontal portion 72 and the vertical portion 73 are formed in a substantially L shape.
[0063]
In this example, as shown in FIG. 8, a convex portion 74 and a concave portion 75 are provided on the upper surface of the horizontal portion 72 of the pedestal 71. The vibration damping material 55 provided on the lower surface 54 of the vertical beam 51 is inserted into the space d5 between the convex portion 74 and the vertical beam 51.
[0064]
The discarded frame 61 provided on the lower surface 54 of the vertical beam 51 is inserted into a space d3 between the vertical beam 51 and a concave portion 75 formed between the convex portions 74 of the pedestal 71.
[0065]
As shown in FIG. 6, in the vertical portion 73 of the pedestal 71 and the space d4 between the vertical beams 51, the cushioning material 57 provided intermittently on the side surface of the vertical beam 51, And have been inserted.
[0066]
In the present example, a cushioning material 57 provided at the root of the sleeper projection 52 is inserted into the space d4 between the vertical portion 73 and the vertical beam 51.
[0067]
The sleeper projection 52 formed on the vertical beam 51 of the floating ladder sleeper 5 is inserted into a gap d6 formed on a vertical portion 73 of the pedestal 71. The cushioning members 60 provided on both side surfaces of the sleeper projection 52 are inserted between the sleeper projection 52 and the vertical portion 73.
[0068]
When the vehicle travels on the floating ladder track 7, the vertical vibration is absorbed by the vibration isolator 55 (see FIG. 8), and the horizontal vibration is absorbed by the cushioning material 57 (see FIG. 6). The vibration in the front-rear direction is absorbed by the cushioning member 60 (see FIG. 6).
[0069]
As described above, the floating ladder track 7 of the present invention is provided with the vibration isolator 55 intermittently provided in the gap d3 between the vertical beam 51 of the floating ladder sleeper 5 and the horizontal portion 72 of the pedestal 71, and A discard frame 61 is provided in a portion other than 55.
[0070]
Further, the scrap frame 61 is formed by laminating a polyurethane foam 62 and a foamed polyethylene foam 63 in two layers (see FIG. 3).
[0071]
Then, the discarded frame 61 can support the weights of the floating ladder sleeper 5 and the rail 50 without substantially deforming them. Therefore, when forming the pedestal 71 as described later, when casting concrete, the function of the discarded frame 61 as a mold is maintained without deformation of the discarded frame 61.
[0072]
Further, when the vehicle runs on the rail 50 after the completion of the floating ladder track 7, the discarded frame 61 is deformed more than the deformation amount of the vibration isolator 55 and the cushioning material 57.
[0073]
Therefore, the vibration isolating material 55 and the cushioning material 57 can reliably exhibit the vibration isolating function and the buffering function without being affected by the discarded frame 61.
[0074]
That is, the discarded formwork 61 functions as a formwork when the pedestal 71 is formed, and has a strength that does not interfere with the vibration-proof function of the vibration-proof material 55 and the cushioning function of the cushioning material 57 during running of the vehicle. In this example, the disposable mold frame 61 has two layers 62 and 63. However, any material having the above function can be formed with one layer or three or more layers.
[0075]
(Third embodiment)
[0076]
Next, a method of laying the floating ladder track 7 will be described with reference to FIG.
[0077]
Here, first, reinforcing bars buried in the pedestal 71 (see FIG. 7) and the like are arranged (step 1). Next, the floating ladder sleeper 5 is installed at a predetermined position, and the rail 50 is installed thereon (step 2).
[0078]
Next, a plan rail level is set (step 3), and a wooden formwork is assembled around the floating ladder sleeper 5 (step 4).
[0079]
FIG. 10 shows a wooden formwork 76. This wooden form 76 is for forming the pedestal 71, and includes an inner form 77 provided on the inner ruler side of the vertical beam 51 in the floating ladder sleeper 5 and an outer form 78 provided on the outer rail side. Have.
[0080]
These inner and outer molds 77 and 78 are provided over substantially the entire length of the rail 50 as shown in FIG.
[0081]
Next, as shown in FIG. 9, concrete 80 (concrete 80) is placed in a space 79 surrounded by the vibration isolator 55 and the cushioning material 57 provided in the floating ladder sleeper 5, the discarded frame 61, and the inner and outer frames 77 and 78. 10 and 11) (step 5).
[0082]
Next, the concrete is cured, and the inner and outer forms 77 and 78 of the wooden form 76 are removed. At this time, the discarded frame 61 is left as it is (step 6). Thereafter, the final planned rail level adjustment is performed (step 7).
[0083]
As described above, according to the method of laying the floating ladder track 7 of the present invention, since the discarded frame 61 is left to the end, there is no need to dissolve and remove the discarded frame 61 with limonene liquid or the like as in the related art.
[0084]
Therefore, it is possible to reduce the number of working steps and to prevent the liquid material dissolved in the limonene liquid from flowing out.
[0085]
(Fourth embodiment)
[0086]
FIG. 12 shows a fourth embodiment according to the present invention. The same parts as those of the floating ladder sleeper 5 (see FIG. 1) and the floating ladder track 7 (see FIG. 6) are denoted by the same reference numerals, and detailed description is omitted.
[0087]
In the present invention, the floating ladder track 7 (see FIG. 6) is laid on a bridge 86 using a PC (Pressed Concrete) girder 85. A plurality of PC digits 85, three in this example, are used.
[0088]
These PC girders 85 are arranged in parallel with a direction Y intersecting with the longitudinal direction X of the rail 50 (see FIG. 14). The PC girder 85 is manufactured at a factory or the like and transported to the site.
[0089]
On the PC girder 85, a drainage gradient concrete 87 which is a finish concrete is provided. The drainage gradient concrete 87 is provided with a downward gradient on both sides from its intermediate portion.
[0090]
A passage 88 and a balustrade 89 are provided for external measurement of the PC girder 85 on both sides. In this example, a passage 88 is provided on one side. These passages 88 and balustrades 89 are formed by casting concrete on site. The drainage gradient concrete 87 extends to the passage 88 and the balustrade 89.
[0091]
As shown in FIG. 13, a gap 91 extending along the longitudinal direction X of the rail 50 (see FIG. 14) is provided between the adjacent PC girders 85 and 85. The space 91 is filled with a filling concrete 92.
[0092]
An anchor 93 is provided in the filling concrete 92. The upper side of the anchor 93 projects above the drainage gradient concrete 87.
[0093]
As shown in FIG. 12, the pedestal 71 of the floating ladder track 7 is provided with a fixing beam member 95 projecting in a direction Y intersecting with the longitudinal direction X of the rail 50. The beam member 95 is formed together with the pedestal 71 by casting concrete in place. The beam member 95 is formed at substantially the same height as the horizontal portion 72 of the pedestal 71 (see FIG. 7).
[0094]
In this example, the beam members 95 protrude to the outer and inner rail sides of both pedestals 71. The beam members 95 provided on the inner rail side of the pedestals 71, 71 are integrated left and right. One end (the right end in FIG. 12) of the beam member 95 is arranged on the concrete 92 between the PC girders 85.
[0095]
The other end (the left end in FIG. 12) of the beam member 95 is disposed on the passage 88. An anchor 93 is provided in the passage 88. The anchor 93 is embedded in the beam member 95.
[0096]
A common horizontal reinforcing bar 96 is arranged in the pedestal 71 and the beam member 95. The reinforcing bar 96 is welded to the filling concrete 92 and the anchor 93 provided in the passage 88.
[0097]
In this example, as shown in FIG. 14, the rail 50 extends obliquely with respect to the center line 86a of the bridge 86. Therefore, the vertical beam 51 and the pedestal 71 of the floating ladder sleeper 5 are also installed in parallel with the rail 50. The beam member 95 protruding from the pedestal 71 is disposed at right angles to the center line 86 a of the bridge 86.
[0098]
As described above, in the present invention, the reinforcing bar 96 is provided on the beam member 95 provided on the pedestal 71 of the floating ladder track 7, and the reinforcing bar 96 is filled in the gap 91 between the PC girders 85 and the concrete filling 92. It is fixed to an anchor 93 provided in the passage 88.
[0099]
Since the concrete 92 and the passage 88 are sufficiently thick, the anchor 93 can be securely held.
[0100]
Therefore, since there is no need to perform post-processing such as providing the anchor 93 on the PC girder 85, the floating ladder track 7 can be fixed without adversely affecting the PC girder 85.
[0101]
In this example, the anchor 93 is provided in the filling concrete 92 and the passage 88. However, the filling concrete 92 is arranged on both sides of the beam member 95 according to the number of PC girders 85 and the installation position of the floating ladder track 7. In this case, the reinforcing bar 96 can be welded to the anchor 93 provided only on the concrete 92.
[0102]
【The invention's effect】
In the present invention, the vibration isolator is provided intermittently on the lower surface of the vertical beam of the floating ladder sleeper, the cushioning material is intermittently provided on the side surface of the vertical beam, and the damping material is discarded in a portion excluding these vibration isolator and the cushioning material Since the frames are provided without gaps, there is no need to provide a core for providing an interval between the vertical beam and the pedestal when laying concrete for forming the pedestal when constructing the floating ladder track. Therefore, the number of work steps can be reduced.
[0103]
Since the discarded form supports the weight of the floating ladder sleeper and the rail without substantially deforming, when the concrete is cast to form the pedestal, the discarded form serves as a form.
[0104]
Further, when the mold is removed after the concrete is cast, the discarded frame is left as it is, so that the number of working steps can be reduced. On the other hand, when the vehicle travels on the rails after the completion of the floating ladder track, the damping frame is deformed more than the deformation amount of the vibration damping material and the cushioning material, so that the vibration damping material and the cushioning material are affected by the damping frame. A vibration-proof function and a shock-absorbing function can be exhibited without the need.
In the case where the waste frame is formed of two layers of a polyurethane foam and a foamed polyethylene foam, these materials can be easily obtained from the market, so that the cost can be reduced.
[0105]
In addition, a padding material is provided in the gap between the PC girders, and the anchors provided in the padding material are connected to the pedestal of the floating ladder track and the reinforcing bar in the beam member projecting from the pedestal. Floating ladder trajectory can be fixed without giving
[Brief description of the drawings]
FIG. 1 is a plan view showing a floating ladder sleeper according to a first embodiment of the present invention.
FIG. 2 is a sectional view taken along line AA of FIG.
FIG. 3 is a view showing a vibration isolator and a scrap frame according to the first embodiment of the present invention.
FIG. 4 is a sectional view taken along line BB of FIG. 3;
FIG. 5 is a plan view showing a cushioning material and a scrap frame according to the first embodiment of the present invention.
FIG. 6 is a plan view showing a floating ladder trajectory according to a second embodiment of the present invention.
FIG. 7 is a sectional view taken along line CC of FIG. 6;
8 is a sectional view taken along line DD of FIG. 7;
FIG. 9 is a flowchart illustrating a method for laying a floating ladder track according to a third embodiment of the present invention.
FIG. 10 is a plan view showing a state where a mold according to a third embodiment of the present invention is assembled.
FIG. 11 is a sectional view taken along line EE of FIG. 10;
FIG. 12 is a sectional view showing a bridge using a PC girder and a floating ladder track according to a fourth embodiment of the present invention.
FIG. 13 is a cross-sectional view showing an interposed concrete and an anchor filled between PC girders according to a fourth embodiment of the present invention.
FIG. 14 is a plan view showing a floating ladder sleeper and a beam member according to a fourth embodiment of the present invention.
FIG. 15 is a plan view showing a conventional example.
FIG. 16 is a sectional view taken along line FF of FIG. 15;
FIG. 17 is a plan view showing another conventional example.
18 is a sectional view taken along the line GG of FIG.
[Explanation of symbols]
1 floating ladder sleeper
5 Floating ladder sleeper
6 vertical beams
7 Floating ladder track
9 Connection material
28 pedestal
29 polyurethane
30 sleepie protrusion
31 Roadbed protrusion
32 polyurethane
33 pedestal
33a horizontal part
33b vertical part
34 polyurethane
50 rails
51 vertical beam
52 sleeper projection
53 splicing material
54 Lower surface of vertical beam
55 anti-vibration material
56 Side of vertical beam
57 cushioning material
58 Side view of sleeper projection
59 Side view of sleeper projection
60 cushioning material
61 Discarded formwork
62 polyurethane foam
63 foamed polyethylene foam
70 Roadbed
71 pedestal
72 Horizontal part of pedestal
73 Vertical part of pedestal
74 pedestal projection
75 Base recess
76 wooden formwork
77 inner formwork
78 Outer formwork
79 Space
80 concrete
81 Fixture
85 PC digits
86 Bridge
86a Bridge center line
87 Drainage gradient concrete
88 passage
89 balustrade
91 gap
92 Filled concrete
93 anchor
95 Beam members
96 rebar

Claims (7)

A pair of vertical beams arranged under the pair of rails over the entire length of the rails, a joining material connecting the pair of vertical beams, and a vibration isolator provided intermittently on a lower surface of the vertical beams. In a floating ladder sleeper provided with a cushioning material intermittently provided on the outer rail side of the longitudinal beam,
A portion of the lower surface of the vertical beam excluding the vibration isolating material, and a discarding frame provided substantially without a gap in a portion of the side surface of the vertical beam excluding the cushioning material,
The discarding frame supports the weight of the floating ladder sleeper body and the rails without substantially deforming them, and when supporting the weight of a vehicle traveling on the rails, deforms the vibration isolating material or the cushioning material. A floating ladder sleeper characterized by being deformed more than the amount. In the laying structure of a floating ladder track having a concrete pedestal provided on a roadbed, a floating ladder sleeper installed on the pedestal, and a pair of rails installed on the floating ladder sleeper,
The floating ladder sleeper has a pair of vertical beams arranged over the entire length of the rails under the pair of rails, and a joining material that connects the pair of vertical beams.
The pedestal has a horizontal portion provided below the vertical beam at intervals, and a vertical portion provided at intervals on the side surface of the vertical beam,
Anti-vibration material intermittently provided at an interval between the vertical beam and the horizontal portion,
Cushioning material intermittently provided at the interval between the vertical beam and the vertical portion,
A discarded form provided in a portion of the space between the vertical beam and the horizontal portion excluding the vibration isolator,
Comprising a discarded form provided in a portion of the space between the vertical beam and the vertical portion excluding the cushioning material,
The discarding form frame supports the weight of the floating ladder sleeper and the rails without being substantially deformed, and when supporting the weight of a vehicle traveling on the rails, the deformation amount of the vibration isolating material or the cushioning material is larger than that. A floating ladder trajectory characterized by deformation. The disposal frame is characterized in that a polyurethane foam and a foamed polyethylene foam are laminated in two layers, the polyurethane foam is arranged on the longitudinal beam side, and the foamed polyethylene foam is arranged on the pedestal side. The floating ladder track according to claim 2. A pair of vertical beams installed under a pair of rails, and a floating ladder sleeper having a joining material connecting the pair of vertical beams is installed on a roadbed,
Before or after installing the floating ladder sleeper on the roadbed, intermittently provide a vibration isolating material on the lower surface of the vertical beam, and provide a buffer material intermittently on the side surface of the vertical beam,
Formwork is provided around the floating ladder sleeper,
Casting concrete in the formwork, in a method of laying a floating ladder track forming a pedestal supporting the floating ladder sleeper,
Before or after providing the form around the floating ladder sleeper,
The weight of the floating ladder sleeper and the rail is supported on a portion of the lower surface of the vertical beam excluding the vibration isolating material and on a portion of the side surface of the vertical beam excluding the cushioning material without substantially deforming. In addition, when supporting the weight of the vehicle traveling on the rails, providing a discarded mold that deforms more than the deformation amount of the vibration-proof material or the cushioning material without gaps,
Placing concrete in the space surrounded by the formwork, the discarded formwork and the vibration-proof material or the cushioning material,
A method of laying a floating ladder track, comprising removing the form after leaving a discarded form after a predetermined period. A method of laying a plurality of PC girders in parallel in a direction intersecting with a longitudinal direction of a rail, and laying the floating ladder track according to claim 2 or 3 on the PC girders,
Providing a gap between the PC girders,
Filling the filling member in the gap,
An anchor is provided on the filling member,
A method of laying a floating ladder track, comprising connecting a reinforcing bar in the pedestal to the anchor. Providing a beam member protruding from the pedestal in a direction intersecting the longitudinal direction of the rail,
The method of laying a floating ladder track according to claim 5, wherein a reinforcing bar in the pedestal is extended in the beam member. The method of laying a floating ladder track according to claim 5, wherein the anchor is buried in the beam member.

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