JP6935916B2 - A bag for forming a filling layer of a slab type orbit and a filling layer forming method using the bag. - Google Patents

Description

The present invention relates to a bag for forming a filling layer of a slab type track and a method for forming a filling layer using the bag. The present invention relates to a bag body for forming a filling layer in a gap portion with the cutout portion for positioning, and a filling layer forming method using the bag body.

As a railroad track, it has a filling layer made of CA mortar (cement asphalt mortar) formed on roadbed concrete and a concrete track slab provided on the filling layer, and a rail is fastened on the track slab. The slab type orbit is known (for example, Patent Documents 1 and 2). In the slab type track, notches are formed at both ends of the track slab in the longitudinal direction, protrusions are formed on the roadbed concrete, and the notches and the protrusions engage with each other to cooperate with the filling layer described later. It works to restrain (regulate) the lateral movement of the track slab on the roadbed concrete.

The protrusion has a cylindrical or semi-cylindrical shape with an outer diameter of about 450 mm, and the notch has a semicircular arc shape in a plan view and has an inner diameter of about 500 mm, which is larger than the outer diameter of the protrusion. The semicircular annular gap formed between the outer peripheral surface of the protrusion and the inner peripheral surface of the notch is filled with a filling material (filling layer) made of CA mortar, urethane resin, or the like.

In order to facilitate the work of providing a filling layer in the gap between the protrusion and the notch (filling layer forming method), the closed chamber is sewn so as to form a closed chamber having substantially the same shape as the space shape of the gap. A bag body for forming a filling layer, which has a bag body having a sealed structure made of a non-woven fabric having a filling material filling port communicating with the bag body and a core body sewn to the bag body so that the bag body maintains its sewn shape and stands on its own. (Patent Documents 3 and 4).

JP-A-2002-167421 Japanese Unexamined Patent Publication No. 2013-636303 Japanese Patent No. 6026687 Japanese Unexamined Patent Publication No. 2016-223240

However, since the bag body used in the conventional filling layer forming method is made of a soft non-woven fabric, the core body must be sewn to the bag body so that the bag body maintains its sewn shape and stands on its own. , It takes time to manufacture.

The problem to be solved by the present invention is to provide a filling layer in the gap formed between the outer peripheral surface of the protrusion of the roadbed concrete and the inner peripheral surface of the notch of the track slab in the construction of the slab type track. This is to make it possible to easily manufacture the filling layer forming bag body to be used without causing a decrease in workability of the filling layer forming work.

In the slab type track filling layer forming bag body according to the present invention, the track slab (5) is provided on the filling layer (3) formed on the roadbed concrete (1), and the track slab (5) is placed on the track slab (5). In a slab type track to which a rail (9) is fastened, a positioning arc-shaped notch (11) formed at both ends of the track slab (5) in the longitudinal direction and projecting onto the roadbed concrete (1). A filling layer forming bag (40, 60) used for providing a filling layer (19) in a gap (15) with the formed positioning protrusion (13), wherein the gap (15) is provided. A filling space (41) having substantially the same shape as the space shape of) is defined inside, and at least one injection port (42a) for injecting the filling material forming the filling layer (19) is formed on the upper surface. The outer peripheral wall (44) and the protrusion (13) having an arcuate shape in a plan view are provided with the bag body (42) and the bag body (42) is arranged to face the inner peripheral surface of the notch (11). The outer peripheral wall (44) and the inner peripheral wall (45) are made of a resin having an arcuate inner peripheral wall (45) arranged opposite to the outer peripheral surface in a plan view and having self-supporting rigidity and liquid permeability. It is made of non-woven fabric (43A).

According to this configuration, since the outer peripheral wall and the inner peripheral wall have the rigidity to be self-supporting, the bag body arranged in the gap is self-supporting, and the outer peripheral wall and the inner peripheral wall are formed into the inner peripheral surface of the notch by filling with the filling material. And it is in close contact with the outer peripheral surface of the protrusion. Therefore, the workability of the filling layer forming work is not deteriorated. Further, since the outer peripheral wall and the inner peripheral wall have liquid permeability, the filling material in the bag body can exude from the outer peripheral wall and the inner peripheral wall, and can be adhered to the notch and the protrusion. Further, since the bag body does not include a separate member such as a core body for self-supporting, it is easy to manufacture a bag body for forming a filling layer.

The bag body (40, 60) for forming a filling layer according to the present invention is preferably made of a non-woven fabric (43A) in which the outer peripheral wall (44) and the inner peripheral wall (45) allow exudation due to the weight of the filling material. Become.

According to this configuration, the filler in the bag body can be exuded from the outer peripheral wall and the inner peripheral wall and fixed to the track slab and the protrusion without applying pressure at the time of injecting the filler. Therefore, the injection work is easy, and it is not necessary to control the pressure at the time of injection. Furthermore, since no pressure is applied, the injection equipment can be simple.

The bag body (40) for forming a filling layer according to the present invention preferably further includes an upper wall (48) in which the bag body (42) is made of a non-woven fabric that allows the filling material to seep out.

According to this configuration, the air in the bag body is more likely to escape through the upper wall than in the case of simply having air permeability, and air pooling does not occur. Further, since the upper wall is integrated with the filling material, it is possible to prevent the fragments from scattering even when the upper wall is deteriorated.

In the bag body (40, 60) for forming a filling layer according to the present invention, the injection ports (42a) are preferably formed at two positions on both sides of the upper surface of the bag body in the circumferential direction, and the bag body is sewn or sewn. A pair of injection tubes (50) made of a resin cloth sheet (43) that is welded and extends from the injection port (42a) and does not allow exudation due to the weight of the filler is further provided.

If the track slab has a cant (cross slope), the bag body is tilted to match the track slab. In this case, if the injection port is only on the lower side, it is necessary to apply pressure in order to fill the filling space with the filling material, which complicates the work. According to this configuration, the filler can be injected from the higher side regardless of the direction of inclination. Further, by injecting the filling material from one injection pipe at the time of injecting the filling material, the air in the bag body is easily released from the other injection pipe. Further, since not only the injection port but also the injection tube is provided in each injection port, even if the liquid level of the filling material is higher than that of the injection port on the lower side, the filling material is injected without overflowing and exuding. It is held in the tube.

In the bag body (40, 60) for forming a filling layer according to the present invention, preferably, the bag main body is arranged at both ends in the circumferential direction, and the filling material does not allow exudation due to its own weight. It further has a pair of end walls (46) made of a resin cloth sheet (43B) having a lower rigidity than the non-woven fabric used for the peripheral wall.

According to this configuration, since both ends of the bag body in the circumferential direction are rectangular due to the end walls, the bag body does not unnecessarily protrude from the notch and looks good. In addition, the filling material does not seep out from the end walls at both ends in the circumferential direction where the bag body is exposed, which makes it look good. Since the wife wall does not need to be adhered to something, the filler does not need to seep out from the wife wall. Further, since the end wall is made of a cloth sheet having a lower rigidity than the non-woven fabric, the bag for forming the filling layer can be easily rolled and can be stored compactly.

The bag body (40, 60) for forming a filling layer according to the present invention preferably has a bottom wall (43B, 43C) in which the bag body is made of a resin cloth sheet (43B, 43C) that does not allow exudation due to its own weight of the filling material. 47) further.

According to this configuration, it is possible to prevent the resin below the filling layer forming bag from seeping out. Therefore, when the spacer is temporarily placed under the bag for forming the filling layer when the filling layer is formed, the adhesion of the filling material to the spacer can be suppressed.

The bag body (60) for forming a filling layer according to the present invention preferably further includes a plurality of legs (62) integrally formed with the bag body (42) so as to extend the filling space downward. ..

According to this configuration, it is possible to arrange the bag body for forming a filling layer at a height at which a gap forming a drainage passage is formed below the bag body by simply inserting the bag body for forming a filling layer into the gap portion without providing a spacer below. Further, the amount of the filling material used is reduced by forming the gap.

Using the filling layer forming bag (60) provided with the plurality of legs (62), the filling layer is formed in the gap (15) between the notch (11) and the protrusion (13). The method for forming a filling layer of a slab type orbit according to the present invention for forming (19) includes a step of arranging the filling layer forming bag (60) in the gap (15) and the filling material. After the step of filling the lower part of the filling space (41) including the plurality of legs (62) from the injection port (42a) and the curing of the filling material filled in the lower part have started, the filling material is said to be filled. It includes a step of filling the upper part of the filling space (41) from the injection port (42a).

According to this configuration, the rigidity of the legs and the bottom wall of the bag body can be improved by hardening the filling material filled in the lower part of the filling space. As a result, the filling space can be filled with the filling material after forming a gap forming a drainage passage below the bag main body without increasing the rigidity of the plurality of legs and the bottom wall of the bag main body.

According to the bag for forming a filling layer of a slab type orbit according to the present invention, it can be easily manufactured without causing a decrease in workability of the filling layer forming work.

Perspective view showing the outline of the slab type orbit according to the present invention. Perspective view showing a bag body for forming a filling layer and an air tube according to the first embodiment. A cross-sectional view of a bag for forming a filling layer according to the first embodiment (cross-sectional view taken along lines II-II of FIG. 2). The perspective view which shows the 1st process of the filling layer formation method by 1st Embodiment. Perspective view which shows the 2nd step of the filling layer formation method by 1st Embodiment. A perspective view showing a third step of the filling layer forming method according to the first embodiment. Cross-sectional view in the third step according to the first embodiment (cross-sectional view taken along the lines VII-VII of FIG. 6). A perspective view showing a fourth step of the filling layer forming method according to the first embodiment. Perspective view showing the completed state of the gap filling layer portion formed by the construction method according to the first embodiment. Perspective view of the bag body for forming the filling layer according to the second embodiment. Front view of the bag for forming the filling layer according to the second embodiment (XI arrow view in FIG. 10) An exploded front view of a bag for forming a filling layer according to the second embodiment. The perspective view which shows the 1st process of the filling layer formation method by 2nd Embodiment. The perspective view which shows the 2nd step of the filling layer formation method by 2nd Embodiment. A perspective view showing a third step of the filling layer forming method according to the second embodiment. Perspective view showing the completed state of the gap filling layer portion formed by the construction method according to the second embodiment.

First, an outline of the slab type orbit in which the filling layer forming bags 40 and 60 according to the present invention are used will be described with reference to FIG.

The slab type track has a filling layer 3 made of CA mortar (cement asphalt mortar) formed on the roadbed concrete 1 and a concrete track slab 5 provided on the filling layer 3, and is provided on the track slab 5. The rail 9 is fastened by the fastener 7. The track slab 5 is a precast product having a rectangular parallelepiped shape (rectangular parallelepiped shape) having a length of 4900 mm, a width of 2220 mm, and a thickness of about 190 mm. In this case, the thickness (height) of the filling layer 3 may be about 50 mm. In the slab type track, a plurality of the track slabs 5 described above are arranged side by side in the rail laying direction.

Notches 11 for positioning are formed at both ends of the track slab 5 in the longitudinal direction. On the roadbed concrete 1, a cylindrical or semi-cylindrical positioning protrusion 13 that engages with the notch 11 is formed so as to project.

The protrusion 13 has a cylindrical or semi-cylindrical shape with an outer diameter of about 450 mm. The notch 11 has a substantially semicircular arc shape in a plan view, and has an inner diameter of about 500 mm, which is larger than the outer diameter of the protrusion 13. The notch 11 and the protrusion 13 are concentrically engaged with each other through the gap 15 (see FIG. 4). The gap portion 15 is a space having a substantially semicircular arc shape in a plan view defined by an inner diameter-outer diameter difference between the inner peripheral surface of the cutout portion 11 and the outer peripheral surface of the protrusion 13.

The gap 15 is filled with a filling layer 19 leaving a drainage passage 17 on the roadbed concrete 1 side (bottom). As a result, the notch portion 11 and the protrusion portion 13 cooperate with the filling layer 19 to act as a positioning portion that restrains (regulates) the lateral movement of the track slab 5 on the roadbed concrete 1.

Next, the bag body 40 for forming a filling layer according to the present invention and the first embodiment of the filling layer forming method using the bag body will be described with reference to FIGS. 2 to 9.

In the filling layer forming method according to the present embodiment, as shown in FIG. 2, an air tube 30 as a spacer for forming the drainage passage 17 and a filling layer forming bag 40 for forming the filling layer 19 Is used.

The air tube 30 is made of polyurethane resin, has a circular cross-sectional shape, has a substantially semicircular shape in plan view, which is the same as the plan view shape of the gap portion 15, and is a roadbed of the entire bottom portion of the gap portion 15. It is laid on concrete 1. The outer diameter of the air tube 30 may be the same dimension (about 50 mm) as the thickness (height) of the filling layer 3. An air inlet / outlet nipple 32 is attached to one end 30A of the air tube 30 by heat welding. One end of an elongated air inlet / outlet hose 34 is fixed to the air inlet / outlet nipple 32.

The bag body 40 for forming a filling layer is a bag body made of a synthetic resin cloth sheet 43 (43A, 43B) formed in a three-dimensional shape that internally defines a filling space 41 having substantially the same shape as the space shape of the gap portion 15. It has 42. The bag body 42 has an arcuate outer peripheral wall 44 in a plan view arranged opposite to the inner peripheral surface of the notch portion 11, an arcuate inner peripheral wall 45 in a plan view arranged opposite to the outer peripheral surface of the protrusion 13, and a circumferential direction. A pair of end walls 46, a bottom wall 47 (FIG. 3), and an upper wall 48 connecting the outer peripheral wall 44 and the inner peripheral wall 45 are provided at both ends of the wall. These walls (44-48) consist of a single cloth sheet 43 (43A, 43B) cut into a corresponding shape.

As shown in the enlarged view shown in the broken line circle of FIG. 2 and FIG. 3, the cloth sheets 43 adjacent to each other are joined to each other by sewing at the stitched portion S (seam) along the outer peripheral edge. In the present embodiment, the two cloth sheets 43 are sewn together at the sewn portion S slightly inside the edge in a state where the two cloth sheets 43 are overlapped with each other. In the lower part of the bag body 42, the edge of the cloth sheet 43 is located outside the filling space 41, and in the upper part of the bag body 42, the edge of the cloth sheet 43 is located in the filling space 41 so as to improve the appearance. It is located inside. In another embodiment, the cloth sheets 43 adjacent to each other may be joined to each other by welding such as heat welding or ultrasonic welding.

The outer peripheral wall 44, the inner peripheral wall 45, and the upper wall 48 are made of a first non-woven fabric 43A having rigidity and liquid permeability that allows it to stand on its own. Here, the self-supporting rigidity means a rigidity equal to or higher than the rigidity at which each first non-woven fabric 43A formed as a part of the bag main body 42 is self-supporting (does not deform so as to be crushed) when it is in its shape. Since the outer peripheral wall 44 and the inner peripheral wall 45 have an arcuate shape in a plan view and have rigidity that allows them to stand on their own, they stand on their own on a flat surface and do not tip over. Further, since the outer peripheral wall 44 and the inner peripheral wall 45 have rigidity that allows them to stand on their own, the bag body 42 also stands on a flat surface and does not tip over. Further, since the upper wall 48 has a self-supporting rigidity, the distance between the outer peripheral wall 44 and the inner peripheral wall 45 is kept constant at least in the upper part in a state where no external force is applied.

The first non-woven fabric 43A is a non-woven fabric made of synthetic fibers, having randomly knitted pores as a whole, having a basis weight of 50 to 250 g / m ² , and a thickness of 0.5 mm or less. In the first non-woven fabric 43A, the single fibers constituting the first non-woven fabric may be short fibers, long fibers, or a mixed fiber of both, and the single fibers are in an entangled state, and have randomly mesh-like pores as a whole. Any non-woven fabric may be used as long as it is made of a material. The fineness (d) of the single yarn constituting the first nonwoven fabric 43A is preferably 20d or less, preferably 0.5 to 15d, in order to give the nonwoven fabric the distribution of fine pores.

The first non-woven fabric 43A is made of a thermoplastic resin, and is stretched and molded by heating and pressing a mold or the first non-woven fabric 43A, increasing the rigidity, and passing the first non-woven fabric 43A with less or smaller pores. The liquidity can be reduced. However, since it is preferable that the outer peripheral wall 44 and the inner peripheral wall 45 of the present embodiment have liquid permeability and are not too rigid, an unstretched first non-woven fabric 43A that has not been molded with heating is used. Has been done. As for the upper wall 48, an unstretched first non-woven fabric 43A that has not been molded with heating is used.

The first nonwoven fabric 43A is prepared by a known spinning method using a polyolefin such as polyester, polypropylene or polyethylene or a fiber-forming polymer such as nylon or vinylon as a raw material, for example, a melt blow spinning method, a flash spinning method, a centrifugal spinning method, a spunbond method or the like. , Manufactured by randomly forming sheets with mesh-like micropores. As such a non-woven fabric, for example, Smash (registered trademark) manufactured by Asahi Kasei Kogyo Co., Ltd. can be used.

The liquid permeability of the first non-woven fabric 43A is set according to the viscosity of the filling material forming the filling layer 19 by curing. Specifically, the liquid permeability of the first nonwoven fabric 43A is set to such an extent that exudation due to the weight of the filler is allowed. The liquid permeability of the first non-woven fabric 43A can be changed by changing the basis weight of the first non-woven fabric 43A, the presence or absence of a heating press, the press load, the press time, and the like.

On the other hand, the pair of end walls 46 and the bottom wall 47 are woven fabrics 43B (waterproof) made of a thermoplastic resin such as polyester or nylon, which has a rigidity lower than that of the first non-woven fabric 43A and does not have liquid permeability. It consists of taffeta). Here, the non-self-supporting rigidity means the rigidity that the woven fabric 43B, which is a part of the bag body 42, does not stand on its own when it is in its shape (it is deformed so as to be crushed, so-called waistless and soft). Not having liquid permeability means that exudation due to the weight of the filler is not allowed.

Injection ports 42a for injecting the filler are formed through the upper surface of the bag body 42, that is, two locations on both sides of the upper wall 48 in the circumferential direction. A pair of injection pipes 50 made of woven cloth 43B extending upward from each injection port 42a are joined to the upper wall 48 by sewing. In another embodiment, the injection tube 50 may be joined to the upper wall 48 by welding.

The height dimension of the bag body 42 is substantially equal to the thickness dimension of the track slab 5. As a result, the bag body 42, in other words, the filling space 41, has substantially the same shape as the remaining space of the gap portion 15 excluding the volume of the drainage passage 17, and has substantially the same dimensions (volume).

As described above, in the bag 40 for forming the filling layer according to the present embodiment, the outer peripheral wall 44 and the inner peripheral wall 45 are made of a resin non-woven fabric having rigidity and liquid permeability capable of self-supporting, and a core body or the like for self-supporting. Since it is not provided with a separate member, there is no need to sew another member. Therefore, it is easy to manufacture.

Next, a filling layer forming method using the filling layer forming bag 40 will be described with reference to FIGS. 4 to 6.

First, as shown in FIG. 4, as a first step, an air tube 30 inflated by filling with air is arranged on the bottom of the gap 15, that is, on the roadbed concrete 1. The air inlet / outlet hose 34 passes through the gap 21 defined between the ends of the filling layer 3 and the track slab 5 adjacent to each other in the arrangement direction, and exits to the outside of the track slab 5, and the other end thereof. Is connected to an air compressor (not shown), and compressed air is sent from the air compressor into the air tube 30.

Next, as a second step, as shown in FIG. 5, the filling layer forming bag body 40 is fitted onto the air tube 30 in the gap portion 15. Since the bag body 42 of the bag body 40 for forming the filling layer is self-supporting while maintaining its shape due to the rigidity of the outer peripheral wall 44 and the inner peripheral wall 45, the bag body 40 for forming the filling layer can be simply inserted into the gap portion 15. The outer peripheral wall 44 of the main body 42 is substantially in close contact with the inner peripheral surface of the notch 11, and the inner peripheral wall 45 of the bag main body 42 is substantially in close contact with the outer peripheral surface of the protrusion 13. This makes it possible to reliably and easily fit the bag body 42 into the gap portion 15 evenly.

Next, as a third step, as shown in FIG. 6, the filling material is injected from one of the injection pipes 50, and the filling space 41 is filled with the filling material. The filling material is an elastic resin material such as a polyurethane resin, and is injected into the injection pipe 50 using an injection gun (not shown). The filling material injected into the injection pipe 50 flows into the filling space 41 from the injection port 42a by natural flow due to gravity, and is filled in the filling space 41 so as to fill the filling space 41. By defining the filling space 41 by the bag body 42 and filling the filling space 41 with the filling material from the injection port 42a, the filling material can be injected without causing splashing.

At this time, as shown in FIG. 7, if the roadbed concrete 1 and the track slab 5 have a cant (cross slope), the filler is injected from the injection pipe 50 on the higher side (left side in FIG. 7). As a result, the filling material can be filled in the filling space 41 by natural flow without applying pressure. In FIG. 7, the protrusion 13 protruding from the roadbed concrete 1 is not shown. By injecting the filling material, the air in the filling space 41 is easily released to the outside from the injection port 42a on the low side or the high side. When the filling material is filled to fill the filling space 41, the liquid level of the filling material becomes higher than that of the injection port 42a on the lower side, but since the injection pipe 50 is provided so as to extend upward from the injection port 42a. The filler is held in the injection tube 50 without overflowing and exuding.

By filling the filling space 41 with the filling material in this way, the outer peripheral wall 44 of the bag body 42 is in close contact with the inner peripheral surface of the notch 11, and the inner peripheral wall 45 of the bag body 42 is the outer peripheral surface of the protrusion 13. Adhere to. In particular, since the outer peripheral wall 44 and the inner peripheral wall 45 are not heat-pressed and their rigidity is not too high, they are deformed by the pressure of the filler and come into close contact with the notch 11 and the protrusion 13.

Further, since the outer peripheral wall 44 and the inner peripheral wall 45 are made of the first non-woven fabric 43A having liquid permeability, the filler material exudes from the outer peripheral wall 44 and the inner peripheral wall 45. With this exuded filler, the inner peripheral wall 45 of the bag body 42 is adhered to the outer peripheral surface of the protrusion 13, and the outer peripheral wall 44 of the bag body 42 is adhered to the inner peripheral surface of the notch 11. As a result, the bag body 42 is fixed to the protrusion 13 and the track slab 5, and the arrangement position of the filling layer forming bag 40 in the gap 15 is stabilized. Further, even if pressure is not applied when injecting the filler, the filler in the bag body 42 exudes from the outer peripheral wall 44 and the inner peripheral wall 45, so that the injection work is easy and it is necessary to control the pressure at the time of injection. No. Furthermore, since no pressure is applied, the injection equipment can be simple.

Further, since the upper wall 48 of the bag body 40 is made of the first non-woven fabric 43A made of resin that allows the filling material to seep out, the air inside the bag body 40 makes the upper wall 48 more air-permeable than the case where the bag body 40 is simply breathable. It is easy to pass through and no air pool is generated. Further, since the upper wall 48 is integrated with the filling material, it is possible to prevent the fragments from scattering when the upper wall 48 deteriorates.

As shown in FIG. 8, after the filler has hardened to some extent, the injection tube 50 is cut and removed. After the filling material in the filling space 41 is cured, as a fourth step, air is discharged from the air tube 30 and the withered air tube 30 is taken out from the gap portion 15. The air tube 30 may be taken out by grasping the air inlet / outlet hose 34 with the air inlet / outlet hose 34 as a pull string and pulling the air tube 30 out from the gap portion 15 through the gap portion 21.

By taking out the air tube 30 from the gap 15 in this way, as shown in FIG. 9, a drainage passage 17 is formed at the bottom of the gap 15 where the air tube 30 was previously located, and a filling layer is formed above the drain passage 17. The forming bag body 60 completes the gap filling layer structure in which the filling layer 19 exists.

In other embodiments, a known water-permeable urethane sponge may be used as the spacer. In this case, the urethane sponge does not need to be removed after the effect of the filling material, and the urethane sponge forms a drainage passage 17 below the filling layer 19.

Since the bag body 42 is provided with a pair of end walls 46 made of a woven fabric 43B having a lower rigidity than the first non-woven fabric 43A, which does not allow the filling material to seep out due to its own weight, the bag body 42 has a rectangular shape at both ends in the circumferential direction. None, it does not protrude unnecessarily from the notch 11. Therefore, it looks good. In addition, the appearance is improved by the fact that the filling material does not exude from the pair of exposed wife walls 46 of the bag body 42. Since the end wall 46 does not need to be adhered to something, the filler does not need to seep out from the end wall 46. Further, since the end wall 46 is made of a woven cloth 43B which is a cloth sheet 43 having a lower rigidity than the first non-woven fabric 43A, the filling layer forming bag 60 can be easily rolled and stored compactly. Is possible.

By performing the construction according to the above procedure, a drainage passage 17 is formed on the bottom side of the gap portion 15 formed between the protrusion 13 of the roadbed concrete 1 and the notch 11 of the track slab 5, and the remaining portion of the gap portion 15 is filled. The work of providing the layer 19 can be performed quickly and reliably with good workability. That is, the workability of the filling layer forming work is not deteriorated. Further, since the bottom wall 47 is made of a woven fabric 43B that does not allow the filling material to seep out due to its own weight, the filling material is suppressed from adhering to the air tube 30 for forming the drainage passage 17. Therefore, the air tube 30 can be used repeatedly, which is economical.

Next, the method for forming the filling layer according to the present invention and the second embodiment of the filling layer forming bag 60 used for carrying out the construction method will be described with reference to FIGS. 10 to 16. The description of the configuration, procedure, effect, etc. common to the second embodiment will be omitted as appropriate.

In the filling layer forming method according to the present embodiment, as shown in FIGS. 10 and 11, the air tube 30 (FIG. 2) is not used, and the filling layer is formed so as to form the drainage passage 17 independently. The bag body 60 is used. The filling layer forming bag body 60 has a synthetic resin bag body 42 formed in a three-dimensional shape that internally defines a filling space 41 having substantially the same shape as the space shape of the gap portion 15, and the filling space 41 extends downward. A plurality of legs 62 integrally formed with the bag body 42 so as to be taken out are provided.

The bag body 42 of the present embodiment has a hole formed in a portion of the bottom wall 47 where the legs 62 are provided, and the bottom wall 47 and the upper wall 48 are made of a material different from that of the first embodiment. It is different from the form. The bottom wall 47 of the present embodiment is made of a second non-woven fabric 43C formed from the first non-woven fabric 43A. Specifically, the first non-woven fabric 43A or the mold is heated to impart plasticity to the first non-woven fabric 43A, and in that state, the first non-woven fabric 43A is pressed by the mold to form a second non-woven fabric. The bottom wall 47 is formed by 43C.

As a result, as shown in FIG. 12, a member made of a second non-woven fabric 43C in which the bottom wall 47 and the plurality of legs 62 protruding downward from the bottom wall 47 are integrally molded is formed. The height (length) of the leg portion 62 may be the same dimension (about 50 mm) as the thickness (height) of the filling layer 3. Due to press molding accompanied by heating, the liquid permeability of the second non-woven fabric 43C is lower than that of the first non-woven fabric 43A before heating, and the rigidity of the second non-woven fabric 43C is higher than that of the first non-woven fabric 43A before heating. .. As a result, the second non-woven fabric 43C forming the bottom wall 47 and the legs 62 is provided with a property that does not allow the filler to seep out due to its own weight and a rigidity that allows it to stand on its own and support a certain amount of the filler. ..

On the other hand, the upper wall 48 is made of woven cloth 43B. The outer peripheral wall 44, the inner peripheral wall 45, and the pair of end walls 46 are joined to each other by sewing at the sewn portion S (FIG. 11) and are joined to the upper wall 48, while the welded portion W to the bottom wall 47. It is joined by welding in (FIG. 11). It is the same as the first embodiment in that the outer peripheral wall 44 and the inner peripheral wall 45 are made of the first non-woven fabric 43A having the rigidity and the liquid permeability so as to be self-supporting.

Alternatively, the bottom wall 47 may be formed by a thin plate made of polyethylene terephthalate (PET) so as to integrally include the plurality of legs 62. In this case as well, the bottom wall 47 and the legs 62 are provided with a characteristic that does not allow the filler material to seep out due to its own weight, and have a thickness determined so as to be self-supporting and have a rigidity capable of supporting the filler material to some extent. Thin plate is used.

Next, a filling layer forming method using the filling layer forming bag 60 will be described with reference to FIGS. 13 to 16.

First, as shown in FIG. 13, as a first step, the filling layer forming bag body 60 is fitted into the gap portion 15 with the leg portion 62 facing down. Since the legs 62 and the bag body 42 of the filling layer forming bag body 60 maintain their shapes and stand on their own, the bag body 42 can be moved downward by simply inserting the filling layer forming bag body 60 into the gap portion 15. The outer peripheral wall 44 of the bag body 42 is substantially in close contact with the inner peripheral surface of the notch 11, and the inner peripheral wall 45 of the bag body 42 is placed on the outer peripheral surface of the protrusion 13. Approximately close contact.

Next, as the second step, as shown in FIG. 14, the filling material is injected from one of the injection pipes 50, and as shown by the imaginary line, the filling material is filled only in the lower part of the filling space 41. The filler is also filled in the plurality of legs 62. When the roadbed concrete 1 and the track slab 5 have a cant (cross slope), the filling space 41 is filled to a height at which the filling material is accumulated even on the high side. In this state, the injection of the filler is temporarily stopped, and the curing of the filler is waited for.

When the filling material filled in the lower part of the filling space 41 starts to harden, the rigidity of the lower part of the filling space 41 including the leg portion 62 and the bottom wall 47 in which the filling material is integrated becomes high. Therefore, after the filling material has been cured to some extent, as a third step, as shown in FIG. 15, the filling material is injected from one of the injection pipes 50 and filled in the upper part of the filling space 41 to fill the filling space. 41 Fill the filling material to the full. Since the filling layer forming bag 60 includes the plurality of legs 62, the amount of the filling material used is reduced by the amount of the gap forming the drainage passage 17 to be formed.

The filler filled in the second step and the third step exudes from the outer peripheral wall 44 and the inner peripheral wall 45, and the inner peripheral wall 45 of the bag body 42 adheres to the outer peripheral surface of the protrusion 13 by the exuded filler. Then, the outer peripheral wall 44 of the bag body 42 is adhered to the inner peripheral surface of the notch portion 11. As a result, the bag body 42 is fixed to the protrusion 13 and the track slab 5, and the arrangement position of the filling layer forming bag 60 in the gap 15 is stabilized.

As shown in FIG. 16, after the filler has hardened to some extent, the injection tube 50 is cut and removed. By removing the injection pipe 50, a drainage passage 17 is formed at the bottom of the gap 15 below the bag body 42 raised by the legs 62, and the filling layer 19 is present above the drainage passage 17 by the filling layer forming bag body 60. The gap filling layer structure is completed.

As described above, in the present embodiment, the bag body 60 for forming the filling layer, which is integrally provided with the plurality of legs 62 in the bag body 42, is used, and the legs 62 and the legs 62 and the filling material are cured by curing the filling material filled only in the lower part of the filling space 41. The rigidity of the lower part of the filling space 41 including the bottom wall 47 is improved. Therefore, even if the rigidity of the legs 62 and the bottom wall 47 of the bag body 42 is not increased, the filling space 41 is filled with the filling material after forming a gap forming the drainage passage 17 below the bag body 42. Can be done.

The preferred embodiment of the present invention has been described above, but as can be easily understood by those skilled in the art, the present invention is not limited to such an embodiment and does not deviate from the gist of the present invention. Can be changed as appropriate. For example, some configurations of the above embodiments may be combined with other embodiments. In addition, not all of the components shown in the above embodiments are indispensable, and they can be appropriately selected as long as they do not deviate from the gist of the present invention.

1 Roadbed concrete 3 Filling layer 5 Track slab 7 Fastener 9 Rail 11 Notch 13 Protrusion 15 Gap 17 Drainage passage 19 Filling layer 21 Gap 40 Filling layer forming bag body 41 Filling space 42 Bag body 42a Injection port 43 Cloth Sheet 43A 1st non-woven fabric 43B Woven fabric 44 Outer wall 45 Inner peripheral wall 46 Wife wall 47 Bottom wall 50 Injection pipe 60 Filling layer forming bag 62 Legs

Claims (8)

In a slab type track in which track slabs are provided on a filling layer formed on roadbed concrete and rails are fastened on the track slabs, positioning circles formed at both ends of the track slabs in the longitudinal direction. A bag for forming a filling layer, which is used to provide a filling layer in a gap between an arc-shaped notch and a protruding portion for positioning formed on the roadbed concrete.
A bag body is provided in which a filling space having substantially the same shape as the space shape of the gap portion is defined inside, and at least one injection port for injecting the filling material forming the filling layer is formed on the upper surface.
The bag body has an arcuate outer peripheral wall in a plan view arranged to face the inner peripheral surface of the notch portion and an arcuate inner peripheral wall in a plan view arranged to face the outer peripheral surface of the protrusion. A bag for forming a filling layer, wherein the outer peripheral wall and the inner peripheral wall are made of a resin-made non-woven fabric having rigidity and liquid permeability that allows it to stand on its own. The bag for forming a filling layer according to claim 1, wherein the outer peripheral wall and the inner peripheral wall are made of a non-woven fabric that allows the filling material to exude due to its own weight. The bag body for forming a filling layer according to claim 2, wherein the bag body further includes an upper wall made of a non-woven fabric that allows the filling material to exude. The injection ports are formed at two locations on both sides of the upper surface of the bag body in the circumferential direction.
A claim, further comprising a pair of injection tubes made of a resin cloth sheet that is sewn or welded to the bag body and extends from the injection port and does not allow exudation due to the weight of the filler. The bag for forming a filling layer according to any one of 1 to 3. A pair of resin cloth sheets in which the bag body is arranged at both ends in the circumferential direction and is less rigid than the non-woven fabric used for the outer peripheral wall and the inner peripheral wall, which does not allow the filling material to seep out due to its own weight. The bag for forming a filling layer according to any one of claims 1 to 4, further comprising a bag wall of the above. The filling layer for forming the filling layer according to any one of claims 1 to 5, wherein the bag body further has a bottom wall made of a resin cloth sheet that does not allow the filling material to seep out due to its own weight. Bag body. The filling layer forming bag according to any one of claims 1 to 6, further comprising a plurality of legs integrally formed with the bag body so as to extend the filling space downward. body. A method for forming a filling layer by using the filling layer forming bag according to claim 7 to form the filling layer in the gap between the notch and the protrusion.
The step of arranging the bag for forming the filling layer in the gap, and
A step of filling the filling material from the injection port to the lower part of the filling space including the plurality of legs, and
A method for forming a filling layer, which comprises a step of filling the filling material from the injection port to the upper part of the filling space after the curing of the filling material filled in the lower portion has started.

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