JP4249560B2 - Adjustable pad and rail height adjustment method - Google Patents

Description

  When a rail is fastened to a track slab or a PC sleeper, a tie plate is fixed to the track slab or PC sleeper, and a rail is placed on the tie plate with a variable pad and a track pad interposed therebetween, and the rail is held. An example of such a variable pad is shown in Patent Document 1 below.

JP-A-8-41803

  Here, the variable pad is a bag filled with resin, and adjusts the height of the rail surface by adjusting the amount of resin injected. This resin supports the rail load by being cured after being injected into the bag.

  The track pad is placed on the variable pad, and a rubber plate is bonded to the lower surface of a metal plate such as a stainless steel plate. This rubber absorbs the impact of the rail. Further, the metal plate makes the rail easy to slide when the rail contacting the upper surface of the metal plate expands or contracts due to a temperature change or the like.

  FIG. 9 is a diagram showing a conventional variable pad and a method of using the same. In FIG. 9A, reference numeral 1 denotes a variable pad, which is formed into a bag shape having a substantially rectangular shape in plan view by thermally welding the peripheral edges of a pair of upper and lower transparent resin sheets. In this figure, reference numeral 2 denotes a welded portion at the periphery.

  The variable pad 1 is formed by integrally forming a rectangular bag body 3 and a resin injection port 4 and an air vent port 5 that protrude outward from the corners of the diagonal positions. That is, a passage serving as the resin inlet 4 and the air vent 5 is formed between a pair of upper and lower sheets. A one-way valve 6 for preventing the back flow of the resin liquid is attached to the resin inlet 4.

  The variable pad 1 is inserted together with a track pad (not shown) between a rail bottom surface (not shown) and a tie plate (not shown) when fixing a normal rail to a sleeper. In this state, a resin liquid is injected into the resin injection port 4. FIG. 9B shows this injection process, and reference numeral 7 denotes the injected resin liquid. Since air is contained in the variable pad 1, the air in the bag body 3 of the variable pad 1 is driven into the air vent 5 by the injection of the resin liquid 7 and discharged to the atmosphere.

  When the air in the bag body 3 is completely removed, the resin liquid 7 starts to flow out from the air vent 5. FIG. 9C shows this state. Then, the operator quickly presses the air vent 5 with his fingertip and closes it with the clip 8. FIG. 9D shows this state. In this state, the thickness of the variable pad 1 is adjusted by controlling the supply amount of the resin liquid. When the thickness is appropriate, the resin solution supply is stopped. Since the one-way valve 6 is attached to the resin inlet 4, the resin liquid in the bag body 3 does not flow backward.

  In this state, the resin liquid will be cured by waiting for an appropriate time. This curing allows the variable pad to support the rail load. Further, after the resin is cured, the resin injection port 4 and the air vent port 5 are unnecessary, and therefore, they are cut in the vicinity of their roots. A line indicated by 9 in FIG. 9D indicates the position to be cut.

  In the conventional variable pad 1, not only at least one operator is required to inject the resin liquid into the resin injection port 4, but also the resin liquid starts to flow from the air vent 5 and starts to flow out. At least one additional worker is required to close the air vent 5 immediately before or immediately after the start of outflow. For this reason, at least two workers are required, and there is a problem that work efficiency is poor.

  In addition, it is inevitable that the resin liquid usually flows out to some extent immediately before the air vent 5 is closed, and if the monitoring by the operator is inappropriate, the resin liquid will flow out from the air vent 5 vigorously. For this reason, there is a problem that the amount of the resin liquid that is wasted increases and the resin liquid that has flowed out contaminates the surroundings.

  Furthermore, when the resin injection is finished and the resin filler is separated from the resin injection port 4, it is inevitable that a small amount of the resin liquid drips from the resin injection port 4. For this reason, there also existed a problem that the circumference | surroundings near the resin injection port 4 were also soiled.

  The present invention has been made in view of such circumstances, makes it possible to reduce the number of workers required without monitoring the air vents, improve work efficiency, and waste resin liquid. It is a first object of the present invention to provide a variable pad that can eliminate the possibility that the resin liquid that has flowed out contaminates the surroundings. It is also a second object of the present invention to provide a variable pad that prevents the resin liquid from dripping from the resin injection port to the surroundings when the resin injection is finished and the resin filler (pump) is disconnected from the resin injection port. The purpose. It is a third object of the present invention to provide a rail height adjusting method using this variable pad.

According to the first aspect of the present invention, a variable pad that is interposed below the rail, adjusts the thickness according to the injection amount of the resin liquid, and supports the rail load by curing the resin liquid, has a pair of upper and lower sides. a bag body made of resin plan view rectangle a peripheral thermally welding the sheet, and a resin injection port to guide the liquid resin into the bag body and protrudes outwardly from the corner of the bag body, wherein the resin of the bag body and an air vent port for forming the small-diameter passage projecting from the diagonal position of the inlet to the outside, and stuffed plug pressure loss is loaded in the air vent opening is a rod-shaped filter large with respect to the resin solution reduced relative to air The plug is formed of a material that does not melt at the heat welding temperature of the sheet and is formed long along the length of the air vent and is thermocompression bonded to the upper and lower sheets on a welding line that crosses the air vent. especially Zheng Rukoto Variable pad to be achieved by.

  The second object can be achieved by attaching a bone member that can be plastically deformed to the resin inlet in the variable pad along the resin passage. The bone member is bent upward together with the resin injection port after the resin injection is completed, so that the resin in the variable pad can be prevented from dripping from the resin injection port.

A third object is to provide a rail height adjustment method in which a variable pad is interposed below the rail to adjust the rail height. A) A rail is held at a predetermined height using a removable rail height holder. forming a gap rail downward, b) step a) either the variable pad of claim 1-8 resin unfilled inserted into the gap formed in the rail downwardly, c) a variable from the air vent port of the variable pad Resin is injected from the resin injection port while extruding air inside the pad; d) Resin injection is continued until the air is exhausted from the air release port and the variable pad is thick enough to fill the gap formed in step a). E) After the thickness of the variable pad has become appropriate, the resin injection is stopped to cure the resin, and f) after the resin is cured, the rail height holder used in step a) is removed. Rail height adjustment To achieve this.

According to the first invention, the following effects can be obtained.
(A) When the air is completely removed from the air vent, the resin penetrates into the plug and is automatically closed, so that the work of monitoring the air vent and closing it in time is unnecessary. For this reason, the number of workers can be reduced and work efficiency can be improved.
(B) Since the resin liquid does not flow out from the air vent, wasteful consumption of the resin liquid can be prevented.
(C) Since the resin liquid does not flow out from the air vent, the resin liquid does not flow out and soils the surroundings.
(D) The filling plug thermally welds a pair of upper and lower sheets forming the bag body, and heat-welds the upper and lower sheets from above the filling plug across the air vent, while melting the filling stopper at the heat welding temperature of the sheet. Because it is made of a non-material (such as cotton), the filling plug does not lose its breathability during this heat welding, and only the sheet is reliably heat welded, and the melted sheet is slightly attached to the surface of the filling plug. As a result, the plug and the sheet are securely bonded. For this reason, it is possible to prevent the resin from leaking out through the periphery of the plug by ensuring the close contact between the plug and the air vent.

  According to the second invention, by bending the resin injection port upward after filling the resin, the resin liquid can be prevented from dripping from the resin injection port, and the surroundings can be prevented from becoming dirty.

  According to the third invention, a rail height adjusting method using this variable pad is obtained.

As the filling plug, cotton rods compressed into a rod shape can be used. Instead of cotton, an open cell filter such as a rod-shaped non-woven fabric, urethane sponge, hemp string, tobacco filter or the like may be used. The function required for this plug is that the pressure loss against the resin liquid is larger than the pressure loss against air (pressure loss, passage resistance), and an air filter having normal fine open cells is highly viscous (large). An extremely large pressure loss (passage resistance) is generated for the resin liquid.

  The plug may include a component that accelerates the curing of the resin liquid. For example, a plug that includes a component that functions as a curing agent for the resin liquid can be used. The resin liquid is preferably a two-liquid mixed type in which the main agent and the curing agent are mixed immediately before injection and cured after a predetermined time (several tens of seconds at room temperature, preferably 15 to 20 seconds).

  If a one-way valve is attached to the resin injection port, it is possible to prevent the resin from flowing back from the variable pad and dripping outside when the resin injection is finished and the resin injection nozzle is removed from the resin injection port. The resin injection port should have a sufficiently large inner diameter to reduce the pressure drop during resin injection. For example, if the viscosity of the resin is about 2000 mPa · s (= 2000 centipoise) or less at 20 ° C. and the inner diameter is 10 mm or more, good results can be obtained in cold regions and extremely hot regions.

  Also, if a bone member such as a plastically deformable wire is attached to the resin injection port, the resin solution can be prevented from dripping from the resin injection port by bending the resin injection port together with the bone member after the resin solution is injected. Can be prevented.

  If at least one of the pair of upper and lower sheets forming the bag body is provided with a leaching portion through which the resin oozes, a tie plate or track that sandwiches the variable pad by the adhesive force of the oozing resin from here. The variable pad can be firmly fixed to a member such as a pad. Therefore, the movement of the variable pad can be restricted. The oozing portion can be formed by providing an opening in the sheet, and overlaying the nonwoven fabric on the opening, and fixing the periphery of the nonwoven fabric near the edge of the opening by bonding, thermocompression bonding, or the like. At this time, it is desirable that the resin has a certain high viscosity.

  In the rail height adjustment method, a small amount of resin may leak from the air vent depending on conditions such as the material of the plug filled in the air vent, the fixing method of the plug, and the resin filling pressure. In such a case, it is preferable to close the air vent with a clip or the like.

  FIG. 1 is a sectional view showing an example of a rail fastening device for a track slab to which an embodiment of the present invention is applied (direct connection type 8), and FIG. 2 is an exploded perspective view of the main part with a resin filling system added. FIG. 3 and FIG. 3 are operation flowcharts of the rail height adjusting method.

  In FIG. 1, reference numeral 10 denotes a track slab. This slab 10 is a PC (Prestressed concrete) plate having a length of several meters in the rail length direction, and is positioned and laid on the roadbed. An embedded stopper collar 12 is embedded in the slab 10 at a predetermined position.

  In the figure, reference numeral 14 denotes an iron tie plate having a length of about 18 cm in the rail length direction. The tie plate 14 is positioned and placed on the slab 10 with an insulating plate 16 such as a rubber mat interposed therebetween. The tie plate 14 is fixed to the slab 10 by anchor T-bolts 18 and nuts 20.

  The T-bolt 18 has a T-shaped bolt head 18a at the lower end. The embedding plug collar 12 has a substantially circular cross section so that the bolt head 18a can pass through. The bolt head 18a is inserted into the embedding plug collar 12 from above and rotated by 90 ° so that the bolt head 18a is embedded. 12 is engaged with an engagement portion 12a provided at the bottom of the frame.

  Here, the T-bolt 18 and the tie plate 14 are electrically insulated by an insulating collar 22. The insulating collar 22 has a cylindrical boss portion and a flange portion that expands from the upper end of the boss portion 24 in the outer diameter direction. The insulating collar 22 is manufactured, for example, by injection molding a polycarbonate resin mixed with about 8% by weight of short glass fibers.

  As shown in FIG. 1, the insulating plate 16 and the tie plate 14 are passed through the T bolt 18, and further, an iron cover plate 28, an insulating collar 22, a washer 30, a spring washer 32, and a washer 34 are passed. Finally, the nut 20 is screwed and tightened. Here, the boss portion of the insulating collar 22 enters the bolt hole of the cover plate 28 and the tie plate 14. In this way, the tie plate 14 and the T-bolt 18 are electrically insulated by the insulating collar 22.

  In FIG. 1, reference numeral 36 denotes a rail, which is placed on the tie plate 14 through a resin injection type variable pad 38 and a track pad 40 for adjusting the rail height. The leaf spring 42 that holds the rail 36 is fastened and fixed to the tie plate 14 by bolts 44 and nuts 46.

  Here, the tie plate 14 is integrally formed with projecting walls 48 and 48 for guiding the rail bottom portion. These projecting walls 48, 48 stand with an interval substantially matching the width of the bottom 36 </ b> A of the rail 36. The variable pad 38 and the track pad 40 are laid between the projecting walls 48, 48, and the bottom 36A of the rail 36 is placed thereon. The rail 36 is restricted from moving in the left-right direction (width direction) by both projecting walls 48, 48.

  The projecting walls 48, 48 are formed with notches 50, 50 extending downward in the transverse direction, and a bolt head (not shown) formed in a substantially trapezoidal shape of the bolt 44 is engaged therewith. Match.

  The track pad 40 has a metal plate 52 made of a stainless steel plate and a rubber plate 54 bonded to the lower surface of the metal plate 52. The metal plate 52 is made longer than the length of the tie plate 14 in the rail longitudinal direction, and both end portions sandwiching a portion corresponding to the length of the tie plate 14 protrude in the width direction to form a tongue-like portion 56. The four tongue-like portions 56 are bent at the tip portions thereof downward. These tongues 56 are engaged with the projecting walls 48 and 48 of the tie plate 14 for positioning.

  Next, the variable pad 38 will be described. As shown in FIG. 2, the variable pad 38 has a flat and substantially quadrangular bag body 38a, and a resin is injected into the bag body 38a and cured. The variable pad 38 is formed by cutting a pair of upper and lower sheets having a predetermined shape from polyethylene or a laminate of polyethylene and nylon sheets, and welding the peripheral edges of the upper and lower sheets into a bag shape.

  As shown in FIG. 2, the bag body 38a of the variable pad 38 is a quadrangle that is longer in the rail longitudinal direction than the dimension that fills the space between the projecting walls 48 of the tie plate 14. An inlet 58 and an air vent 60 are formed. Each of the inlet 58 and the air vent 60 has a narrow passage extending outward in the diagonal direction. A one-way valve 58 a that allows the injection of resin is attached to the injection port 58. A long plug 60a is loaded in the air vent 60 along the passage.

  The filling plug 60a is made of, for example, stick-shaped cotton, and is easy to pass air in the longitudinal direction and difficult to pass resin liquid. The plug 60a can be loaded into the air vent 60 by fusing both sheets between a pair of upper and lower sheets when making the variable pad 38.

  The track pad 40 is overlaid on the variable pad 38. At this time, both end portions of the track pad 40 protrude to both sides of the tie plate 14, and the tongue 56 engages with both end surfaces of the tie plate 14, that is, both end surfaces of the projecting walls 48, 48 (see FIG. 1). Thus, since the four tongue-like portions 56 engage with both end faces of the projecting walls 48, 48, the track pad 40 is accurately positioned. In other words, the tongue 56 functions as a stopper that restricts the movement of the track pad 40.

  The rail height is adjusted while the rail 36 is placed on the track pad 40. This operation is performed by injecting a resin liquid from the injection port 58 and controlling the injection amount in a state where the resin liquid closes the plug 60a after the air escapes to the atmosphere through the plug 60a of the air vent 60. Is called. This resin injection is performed by a resin filling device 70 described later, and the rail height is made appropriate depending on the amount of resin to be filled. Since the one-way valve 58a is attached to the injection port 58, the resin does not flow backward. The resin hardens after a predetermined time.

  Next, the resin filler 70 will be described with reference to FIG. The resin filler 70 includes a first container 74 for a main agent, a second container 76 for a curing agent, a first cylinder 78, and a second cylinder 80.

  The cylinders 78 and 80 have the same length, and both ends of the cylinders 78 and 80 are fixed to the support plates 82 and 84. Here, both cylinders 78 and 80 are parallel and a gap is provided therebetween. The support plates 82 and 84 are fixed to a base (not shown). The ratio of the cross-sectional areas of the cylinders 78 and 80 is determined so as to be a mixing volume ratio of the main agent and the curing agent.

  Piston rods 78b and 80b of these pumps 78 and 80 protrude through one support plate 82. Pistons (not shown) are fixed to the ends of the cylinders 78a and 80 of the piston rods 78b and 80b. The other ends (external protruding ends) of the piston rods 78b and 80b are coupled to one connecting plate 86. The connecting plate 86 is brought close to and separated from the support plate 82 by a driving portion 88 provided between the piston rods 78b and 80b. As a result, the piston rods 78b and 80b fixed to the connecting plate 86 are simultaneously moved by the same stroke amount.

  The drive unit 88 includes the connecting plate 86, a screw rod 90 that penetrates the connecting plate 86 and the support plate 82 between the cylinders 78 and 80, and a nut portion 92 that is provided on the support plate 82 and is screwed with the screw rod 90. And a manual rotation handle 94 fixed to the protruding end of the screw rod 90 on the connecting plate 86 side. The screw rod 90 and the nut portion 92 form a feed screw mechanism that moves the screw rod 90 forward and backward by the rotation of the screw rod 90.

  On the support plate 84 that supports the other ends of the cylinders 78, 80, there is a tube 100 that sucks the hardening agent into the cylinder 80 from the second container 76 with the tube 98 that sucks the main agent into the cylinder 78 from the first container 74. It is connected. Here, one-way valves 98a and 100a for allowing the main agent and the curing agent to flow in the directions of the cylinders 78 and 80 and preventing the flow in the opposite direction are attached to the connection portions on the support plate 84 side of the tubes 98 and 100. It has been.

  Reference numeral 102 denotes a mixer (nozzle) such as a static mixer. This mixer 102 has a nozzle holder 102a and a rod-shaped nozzle portion 102b, and uniformly mixes the main agent discharged from the cylinder 78 and the curing agent discharged from the cylinder 80, so that the rod-shaped nozzle portion 102b. Discharge from. That is, the main agent discharged from the cylinder 78 is guided to the mixer 102 through the one-way valve 104 and the tube 106 attached to the support plate 84.

  Next, a method for adjusting the rail height using the resin filler 70 will be described. In FIG. 3, the rail 36 is first released from the tie plate 14. That is, the nut 46 is loosened from the tie plate 14 and the leaf spring 42 is removed. A height adjusting tool (not shown) such as a height adjusting block serving as a spacer is sandwiched between the rail 36 and the slab 10, and the height of the rail 36 is set to a predetermined height (for example, a target height). (FIG. 3, step S200). Instead of sandwiching the height adjustment block, the rail 36 may be lifted and held using a jack or a hoisting machine.

  In this state, there is a gap below the rail bottom 36A, so the track pad 40 is pushed up, and the bag of the variable pad 38 before resin filling is inserted under it (step S202). Then, the resin filling device 70 described in FIG. 2 is used to fill the bag of the variable pad 38 with resin (step S204). In filling the resin, first, the rod-shaped nozzle portion 102b of the mixer 102 is inserted into the injection port 58 of the variable pad 38 and fixed. At this time, the nozzle portion 102b may be pressed from the outside of the injection port 58 with a clip or the like. If the handle 94 is rotated counterclockwise, for example, in this state, the screw rod 88 is retracted from the nut portion 92 and the connecting plate 86 is separated from the support plate 82. As a result, the piston rods 78b and 80b are simultaneously withdrawn from the cylinders 78 and 80, and the main agent and the curing agent are sucked into the cylinders 78 and 80 from the first and second containers 74 and 76, respectively.

  If the handle 94 is rotated in the reverse direction, for example, clockwise after the main agent and the curing agent are inhaled, the screw rod 88 enters the nut portion 92. Therefore, the connecting plate 86 approaches the support plate 82, and the piston rods 78 b and 80 b discharge the main agent and the curing agent to the mixer 102. The main agent and the curing agent are uniformly mixed by the mixer 102 and flow into the variable pad 38. At this time, since the resin passes through the one-way valve 58 a provided in the injection port 58, the mixed resin does not flow backward from the variable pad 38 to the mixer 102.

  When the mixed resin is injected into the variable pad 38, the air in the variable pad 38 is pushed out into the atmosphere from the air vent 60 through the plug 60a. Since the plug 60a has a small pressure loss (passage resistance) with respect to air, the air is smoothly discharged. When the air is completely removed, the resin liquid in the variable pad 38 enters the air vent 60, and the resin liquid enters the plug 60a.

  Since the filling plug 60a has a very large pressure loss (passage resistance) with respect to the resin liquid, the resin liquid only penetrates into the filling plug 60a from the bag body 38a side and does not pass therethrough. Further, the soaked resin liquid is not only trapped by the filling plug 60a and closes the vent hole of the filling plug 60a, but also the hardening of the resin liquid captured here in the filling plug 60a proceeds promptly. Therefore, the plug 60a completely closes the air vent 60.

  Thereafter, if the handle 94 is continuously rotated, the resin liquid is further press-fitted into the variable pad 38. For this reason, the thickness of the variable pad 38 increases. When the height of the rail 36 becomes appropriate, the handle 94 is stopped, and the discharge portion 102a of the mixer 102 is removed from the injection port 58. The mixed resin that has entered the variable pad 38 is cured by being left for a while (step S206). In this way, different variable pads 38 may be sequentially filled with resin.

  After the resin is cured, the rail height adjuster is removed (step S208). Further, after the resin is cured, the resin injection port 58 and the air vent port 60 are cut and removed near their roots (step S210). When the work is finished, the mixer 102 is removed from the tubes 106, 110 and washed. That is, it is necessary to remove the mixed resin before the main agent and the curing agent are cured in the mixer 102.

  FIG. 4 is a diagram showing a second example of the variable pad. The variable pad 38A of this embodiment has an air vent 60A disposed substantially perpendicular to the rear edge of the variable pad 38A.

  In the variable pad 38 shown in FIG. 2, the air vent 60 is extended diagonally outward, so that when the pair of upper and lower sheets used for the variable pad 38 are punched, the sheet utilization rate is deteriorated and the sheet is wasted. The amount to be increased. On the other hand, in the variable pad 38A shown in FIG. 4, since the air vent 60 is substantially orthogonal to the trailing edge of the variable pad 38A, the amount of wasted sheets is reduced and the sheet utilization rate is improved.

  Even in this variable pad 38A, the resin injection port 58 and the air vent port 60 are cut off in the vicinity of the respective bases after the resin liquid is cured. In this state, there is no change from the variable pad 38 in FIG. The air vent 60 may be provided in parallel with the rear edge of the variable pad 38. In this case, the amount of wasted sheets is further reduced, and the sheet utilization rate is further improved.

  FIG. 5 is a diagram illustrating a main part of the third embodiment. In this embodiment, a plastically deformable bone member 58b is attached to the resin injection port 58A along the resin liquid passage. As the bone member 58b, for example, a wire such as iron or stainless steel can be used. In this case, if the wire is embedded between the welding surfaces of a pair of upper and lower sheets, the manufacture is simple.

  FIG. 5A shows a state before or during injection of the resin liquid. Thus, in the state where the bone member 58b is linearly extended, the resin liquid passage is open, so that the resin liquid smoothly flows into the variable pad 38.

  FIG. 5B shows a state after the injection of the resin liquid. When the injection of the resin liquid is completed, the operator bends the resin injection port 58A together with the bone member 58b and directs the opening side of the resin injection port 58A upward. Since the bone member 58b maintains this state by plastic deformation, the resin injection port 58A is held with the opening facing upward. For this reason, when the resin filler (pump) is disconnected from the resin injection port 58A, the resin liquid does not hang down from the resin injection port 58A.

  6 is a plan view showing Example 4, FIG. 7 is a sectional view taken along line VII-VII, and FIG. 8 is a sectional view taken along line VIII-VIII. In this embodiment, when the filling plug 60a is loaded into the air vent 60A, a gap through which the resin leaks is not formed around the filling plug 60a.

  The variable pad is thermally welded by a welding line 150 along the edges of the upper and lower sheets, and the air vent 60A is formed by the welding line 150. At this time, the welding line 150 is formed so as to be in close contact with both sides of the filling plug 60a with the filling plug 60a sandwiched between both sheets, but there may be a gap between the welding line 150 and the filling plug 60a. If there is such a gap, the resin flows out, and the effect of preventing the resin from flowing out by the filling plug 60a is diminished.

  In order to avoid such a problem, it is preferable to perform heat welding as shown in the welding line 152 across the air vent 60A. In this case, the upper and lower sheets are in close contact with the outer periphery of the filling plug 60a on the welding line 152, and a gap is not formed.

  In FIGS. 6 and 7, reference numeral 154 denotes a leaching portion, and an opening provided in at least one sheet is closed with a nonwoven fabric 156. That is, the nonwoven fabric 156 superimposed on the inner side of the sheet is heat-welded along the periphery of the opening. 6 and 7, reference numeral 158 denotes this welding line. According to this embodiment, when the variable pad 38 is interposed under the rail, the resin oozes out from the leaching portion 154, and the leached resin functions in the same manner as the adhesive. The variable pad 38 can be fixed to a member (such as a tie plate or a track pad) that is in close contact.

  In each of the above embodiments, the rail height is adjusted by sandwiching the variable pad 38 between the rail 36 and the tie plate 14, but the present invention is not limited to this. The variable pad 38 may be located below the rail 36 and may be placed under a sleeper, for example.

  For example, in an iron bridge, there is a bridge made of steel with a steel beam, and a sleeper is placed on the beam and fixed to the steel. In this case, the height of the sleepers and the height of the rails can be adjusted by interposing a variable pad between the mold steel and the sleepers.

  In addition, at the rail joint, the sleeper sinks into the roadbed due to the impact when passing through the vehicle, and a gap is generated between the sleeper and the roadbed. In this case, the variable pad 38 can be attached to the gap between the sleepers and the roadbed to prevent the rail from sinking. Furthermore, since a plurality of rails are fixed to the sleepers at a predetermined interval at the rail branching portion, the height is adjusted in a state where the rails are usually integrated with the sleepers. In this case, since the variable pad is inserted in the gap formed between the sleepers and the roadbed, the present invention can be applied also at this time.

Sectional drawing of the track fastening apparatus which shows the example of application of Example 1 of this invention Disassembled perspective view showing the main part with a resin filling path Operation flow chart of rail height adjustment method The figure which shows Example 2 of a variable pad. The figure which shows Example 3 of a variable pad. Plan view showing Example 4 VII-VII sectional view in FIG. VIII-VIII sectional view in FIG. The figure explaining the structure of the conventional variable pad, and its usage

Explanation of symbols

14 Tie plate 36 Rail 36A Rail bottom 38, 38A Variable pad 38a Bag body 40 Track pad 58, 58A Resin inlet 58a One-way valve 58b Wire (bone member)
60, 60A Air vent 60a Filling plug 70 Resin filling device 74 First container (filler base container)
76 Second container (container for curing agent)
150, 152, 158 Welding line 154 Exuded portion 156 Nonwoven fabric

Claims (11)

In a variable pad that is interposed below the rail, adjusts the thickness by the amount of resin liquid injected, and supports the rail load by curing the resin liquid,
A substantially rectangular bag body made of resin in which the peripheral edges of a pair of upper and lower sheets are heat-welded, a resin inlet that projects outward from the corner of the bag body and guides the resin liquid into the bag body , and and an air vent port for forming the small-diameter passage that protrudes outward from the diagonal position of the resin injection port, packed pressure loss is loaded in the air vent opening is a rod-shaped filter large relative small resin liquid to air A stopper,
The plug is made of a material that does not melt at the thermal welding temperature of the sheet and is formed long along the length of the air vent, and is thermocompression bonded to the upper and lower sheets on a welding line that crosses the air vent. A variable pad characterized by that. The variable pad of claim 1, wherein the plug is made of cotton. The variable pad according to any one of claims 1 to 2 , wherein the resin liquid is of a two-component mixed type in which a filling main agent and a curing agent are mixed. The resin injection port, any variable pad of claim 1 to 3 in which the one-way valve that prevents backflow of liquid resin is attached. The variable pad according to any one of claims 1 to 4, wherein a plastically deformable bone member extending along the passage of the resin liquid is attached to the resin inlet. The variable pad according to any one of claims 1 to 5 , wherein at least one of the pair of upper and lower sheets forming the bag body is provided with a oozing part through which resin oozes. 7. The variable pad according to claim 6 , wherein the oozing portion is a non-woven fabric attached to an opening provided in the sheet. 6. The variable pad according to claim 5 , wherein the bone member is a wire embedded between the crimping surfaces of a pair of upper and lower sheets. In the rail height adjustment method of adjusting the rail height by interposing a variable pad below the rail,
a) Using a removable rail height holder, the rail is held at a predetermined height and a gap is formed below the rail;
b) Insert the variable pad of any one of claims 1 to 8 which is not filled with resin into the gap formed below the rail in step a),
c) Injecting resin from the resin inlet while extruding air in the variable pad from the air vent of this variable pad;
d) Continue to inject the resin until the air is exhausted from the air vent and the variable pad is thick enough to fill the gap formed in step a),
e) After the variable pad thickness is appropriate, stop the resin injection and cure the resin;
f) A rail height adjusting method, wherein the rail height holder used in step a) is removed after the resin is cured. 10. The rail height adjusting method according to claim 9 , wherein in step d), the air vent is closed with a pinch after the air has been discharged. In step b), the variable pad of claim 5 is used, and after the resin injection is finished in step e), the resin injection port is bent together with the bone member so that the atmosphere side opening of the resin injection port faces upward. 9 rail height adjustment method.

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