JP2008031829A - Rail snow-melting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rail snow-melting device which is a watering sprinkler system, prevents the breakage, bending or the like of a coupling even if the expansion and contraction of piping occurs, prevents the occurrence of leakage or the like caused by expansion and contraction, and is light in weight and facilitates piping work. <P>SOLUTION: A sprinkler piping unit 2 is constituted by connecting watering conduits 22 formed of resin pipes to each other by electrical fusion by a branch coupling 21 and by connecting the watering sprinkler 23 to the opening connection 21a of the branch coupling 21. Then the sprinkler piping unit 2 is connected to a second-pipe coupling 12 of a water-supply pipe part 1 by electrical fusion by an elbow pipe 222, and is supported by a support 3 so that it can freely slide axially. Thus, the upstream end of the sprinkler piping unit 2 is made to be a fixed end K, and on the other hand, the downstream end is made to be a free end J because it is not under any restraint. By this, even if thermal expansion and contraction occurs at the sprinkler piping unit 2 due to a change in atmospheric temperature, the free end J side moves in accordance with the thermal expansion and contraction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a track snow removing device that prevents snow accumulation on tracks such as railways and highways.

  2. Description of the Related Art Conventionally, a snow removal system has been proposed and put into practical use for removing snow falling on a track on a railway line in a cold region. There are a watering system using a sprinkler and a snow-dissipating panel unit system that uses a heat sink using water as a heat medium and melts snow falling on the heat sink.

  For example, a pipe unit that employs the former watering method is a block-shaped base made of concrete, a pipe that is connected to a water pipe arranged in parallel therewith, and is arranged inside the base, and a predetermined interval between the pipes. It consists of a watering nozzle provided, and is continuously installed on the track by fitting the block-like base body into a recessed unit installation portion provided at the center of the viaduct track slab. However, the sprinkler used here is not a method for spraying in the atmosphere, but a watering nozzle method for flowing water on the orbit (see, for example, Patent Document 1).

  However, in any case, since such a piping unit is provided with a concave unit installation portion extending over several kilometers, it is time-consuming and labor intensive to install the piping therein.

  As the latter snow extinguishing panel unit system, there is a snow extinguishing radiator (for example, see Patent Document 2).

  On the other hand, a sprinkler system is often used in areas where there is a lot of snow, such as Shinkansen elevated lines. A track snow-melting device that employs this method is provided with watering pipes and water-feeding pipes in parallel along the railway track. Of these, the watering pipe is usually connected to a steel pipe arranged every 5 to 6 m via a branch joint, and a head rotary sprinkler is installed on this branch joint, and is supplied at about 10 to 20 ° C. supplied from the water pipe. Water is sprayed in the air (see, for example, Patent Document 3).

Japanese Patent Laid-Open No. 11-280035 (first page, FIGS. 1 and 2) Japanese Examined Patent Publication No. 6-76681 (first page, FIG. 1) Japanese Patent Laying-Open No. 2005-155705 (first page, FIG. 2)

  However, since the above-described track snow extinguishing apparatus uses a steel pipe, the whole is quite heavy. As a result, a corresponding support member for supporting the entire mass must be attached to the branch joint portion and the steel pipe portion. Moreover, it is necessary to wind a heat insulating material from the point of thermal efficiency. For this reason, there was a problem to be improved in order to improve workability.

In addition, the steel pipes that make up the orbital snow-melting device undergo thermal expansion and contraction (hereinafter referred to as expansion and contraction) due to changes in the outside air temperature in winter and summer, but if this expansion and contraction cannot be absorbed, the pipe will be bent in extreme cases. Or the fitting is expected to break. For this reason, the connection structure between the steel pipe and the branch joint is given a stretch absorption function.
That is, this conventional expansion and contraction absorption function absorbs expansion and contraction by sealing the connection between the branch joint and the steel pipe with a synthetic rubber packing material and slidably connecting the branch joint and the steel pipe at this portion. ing.

However, providing such an expansion and contraction absorption function increases the number of movable parts, and therefore, when a seal member such as a rubber packing is deteriorated, there is a possibility that water flowing through the steel pipe leaks to the outside.
Furthermore, since the environment on the orbit is harsh, it is better to avoid the use of members that deteriorate over time, such as synthetic rubber.

  The present invention has been made in view of such circumstances, and in sprinkler sprinkler type track snow squirting devices, even if expansion or contraction occurs in a pipe, the joint is not damaged or bent, and water is sprayed due to expansion and contraction. It is an object of the present invention to provide an orbital snow removal device that does not cause leakage of water, is light in weight, is easy to construct piping, and has an energy saving effect.

In order to solve the above technical problem, the track snow removing device according to the present invention has the following technical means.
That is, the track snow removing device according to claim 1 is arranged in parallel with the water supply pipe portion in which the water supply pipes arranged along the track are connected to each other via the pipe joint, and the water supply pipe portion. Sprinkler pipes are connected to each other through a branch joint having an opening at the top, and a sprinkler pipe unit is connected to the sprinkler at the opening, and one end of the sprinkler pipe unit is the water pipe The other end is a free end and is supported by the structure so as to be slidable in the axial direction with the fixed end as a base point. In the present invention, a track indicates a road surface such as a road including a highway in addition to a track such as a railroad. Arranged along the track means that the track is arranged with a certain distance from the track, and is arranged linearly or curvedly according to the condition of the track. Means that. The fact that the sprinkling pipes are arranged in parallel with the water supply pipe part means that the watering pipes are arranged in parallel with or close to the water supply pipe part.

  Conventionally, the branch joint is fixed by the support member, and the expansion and contraction of the steel pipe is absorbed by the joint portion. However, according to the technical means according to claim 1, the fixed end where the one end of the sprinkler piping unit is fixed. Since the other end is a free end and is supported to be extendable and contractible, the entire unit can be moved in the axial direction, and expansion and contraction due to temperature change can be absorbed by movement of the entire unit.

Thereby, the problem concerning the seal structure of the connecting portion between the water spray pipe and the branch joint is solved. Here, if the sprinkler pipe is made of resin, the sprinkler piping unit can be reduced in weight. In addition, if the connection between the sprinkler pipe and the branch joint is integrated by means such as adhesion or fusion, the construction is simple, there is no need to worry about external leakage of the sprinkling water, no heat insulating material is required, and the weight is reduced. The cost advantage is also great due to the simplified construction.

  According to a second aspect of the present invention, there is provided an orbital snow removal device according to the first aspect, wherein at least a connection portion of the water spray pipe and / or the water supply pipe contains a thermoplastic resin, and the branch joint and / or the pipe joint and the water spray pipe and / or Alternatively, the water pipe is electrically fused. Of the branch joint connected to the water spray pipe and the pipe joint connected to the water supply pipe, the joint to be electrofused is composed of a joint molded with resin.

  According to the technical means of claim 2, the water supply pipe constituting the water supply pipe part and / or the water spray pipe constituting the sprinkler piping unit is made of thermoplastic resin, and the pipe joint and / or the branch joint and the water supply pipe part are provided. The main part of the orbital snow removal device can be composed of a resin member by electro-fusion with the water pipe and / or sprinkler pipe constituting the sprinkler piping unit, thus reducing the mass and reducing the support member for the water pipe. Energy saving effect due to improved effect and heat retention is high.

  In the track snow-melting device according to the present invention, the length of one water supply pipe portion is several kilometers, and hot water supply means such as a hot water device and a pump device are connected to the upstream side. A plurality of sprinkler piping units of about one hundred and several tens of meters are provided for the water supply pipe section. Since sprinkler sprinklers are arranged at predetermined intervals (for example, at an interval of 6 m) in the sprinkler piping unit, a relatively large-diameter water supply pipe is required in order to perform watering stably. On the other hand, instead of conventional metal water pipes and metal pipe joints, it is possible to reduce the mass of the track snowplowing device and simplify the construction by using resin water pipes and electric fusion joints. Figured.

  Also, since the water pipe is usually stored in a side groove and closed with a concrete lid, it is placed in a highly humid and highly corrosive environment, but instead of the conventional metal water pipe and metal pipe joint. By comprising the resin water pipe and the electric fusion joint, the fear of leakage of water flowing through the water spray pipe due to metal corrosion is eliminated.

  According to a third aspect of the present invention, there is provided an orbital snow removal device according to the first or second aspect, wherein the water spray pipe and / or the water supply pipe is a tubular metal at a part in a thickness direction of a pipe main body having at least an outer peripheral surface made of a thermoplastic resin. It is a composite resin pipe formed by interposing a plate. At this time, it is preferable to use a metal plate provided with a plurality of holes.

The resin pipe has a thermal expansion coefficient that is an order of magnitude larger than that of the steel pipe (steel pipe: 1.2 × 10 ⁻⁵ / ° C., resin pipe: 1.3 × 10 ⁻⁴ / ° C.), but the amount of expansion / contraction is large, but the technical means according to claim 3 According to the above, by interposing a tubular metal plate between the tube main bodies, the amount of expansion and contraction due to a change in the outside air temperature is reduced to an intermediate size between the steel tube and the resin tube. Furthermore, by interposing a tubular metal plate with a plurality of holes so that the resin of the inner layer and the outer layer are integrated through the holes in the tube body, the amount of shrinkage due to changes in the outside air temperature is reduced to the same level as steel pipes. Is done. In particular, by using this composite resin pipe for the water spray pipe of the piping unit, the misalignment of the water sprinkler can be suppressed. In addition, since the tubular metal plate has a plurality of holes, the inner and outer layers of the water spray tube are integrated through the holes, so that the tubular metal plate and the resin portion of the resin tube are separated from each other. Does not occur. For this reason, long-term durability can be ensured.

  According to a fourth aspect of the present invention, there is provided an orbital snow removal device according to any one of the first to third aspects, further comprising a support member disposed in the middle of the sprinkler pipe to hold the sprinkler piping unit, wherein the support member An over-tightening prevention means for preventing over-tightening of the water pipe is provided. That is, a support member for holding the sprinkler piping unit is provided in the middle of the water spray pipe made of a resin pipe, and the support member is provided with an overtightening preventing means for preventing excessive tightening to the water spray pipe.

The overtightening preventing means serves to prevent pressure (friction force) from acting as much as possible on the contact portion between the support member and the outer peripheral surface of the water spray pipe. This overtightening preventing means is formed by welding a stopper piece to a predetermined portion of a support member such as a metal U band (U bolt).

  Since the conventional track snow-melting device has a large mass, it is essential to provide a supporting member for supporting these at the branch joint portion, and it may be provided in the middle of the steel pipe. In addition, since a buffer member such as rubber material may be interposed to absorb vibration, if the entire piping unit expands or contracts in the axial direction due to changes in the outside air temperature, stress concentrates on the buffer member or the support member and breaks There is a risk that will occur.

In this regard, according to the present invention, the support member in the joint portion becomes unnecessary due to the weight reduction of the piping unit, and the buffer rubber member becomes unnecessary. Installation of the support member is sufficient with only the sprinkling pipe part. Furthermore, since the over-tightening preventing means is provided in the support member, sliding of the water spray pipe in the free end direction is allowed.

  According to a fifth aspect of the present invention, there is provided an orbital snowplow according to any one of the first to fourth aspects, wherein the water supply pipe section and / or the sprinkler piping unit includes a main line section and a detour section eccentric to the main line section. It is characterized by.

  According to the technical means concerning Claim 5, it becomes possible to absorb expansion-contraction in a detour part by having a detour part eccentric to a main line part in a water supply pipe part and / or a sprinkler piping unit. The expansion and contraction of the piping unit is absorbed by the bending portion constituting the bypass portion being displaced with respect to the expansion and contraction of the main line portion. The detour portion only needs to be eccentric with respect to the main line portion. For example, when the detour portion is composed of four bent portions, a bellows pipe (resin is preferably used) that is piped to be curved or stretchable. May be used.

  According to a sixth aspect of the present invention, in the fifth aspect, the water supply pipe portion and / or the sprinkler piping unit is supported by the structure at a portion parallel to or close to the main line portion of the detour portion. It is characterized by.

According to the technical means according to claim 6, in the detour part, the water supply pipe part and / or the sprinkler piping unit is supported by the structure in a part parallel to or close to the main line part. These pipes can be easily slid in the axial direction. Moreover, since it is possible to effectively resist the force to rotate the bypass portion around the axis of the main line portion, rotation of these pipes is prevented. The rotation of the entire piping unit is effectively prevented because the moment that resists the moment to rotate the bypass portion around the axis of the main line portion is increased by the amount of eccentricity.

A track snow-melting device according to a seventh aspect is characterized in that, in the fifth or sixth aspect, the water supply pipe portion and / or the sprinkler piping unit is provided with a bent portion capable of absorbing a part of expansion and contraction in the axial direction. And

According to the technical means of the seventh aspect, by providing the bent portion in a part of the water supply pipe portion and / or the sprinkler piping unit, the expansion and contraction is also absorbed in the bent portion. The track is often straight, but there are situations where it cannot be placed in a straight line due to the presence of obstacles, etc., and the piping may have to be bent or bent. Such a situation can be dealt with by arranging a bent portion or configuring the bent portion with a bellows tube (made of resin is preferable).

  According to the present invention, the sprinkler piping unit is supported by one end of the sprinkler piping unit connected to the water supply pipe portion as a fixed end, the other end as a free end, and the fixed end as a base point so as to be slidable in the axial direction. Even if expansion / contraction occurs, the joint is not damaged, the tube is not bent, etc., and a situation in which leakage occurs due to expansion / contraction can be avoided. Moreover, when resin is used for at least a part of the piping, it is possible to provide an orbital snow removal device that is lightweight, easy to perform piping construction, has good heat retention, and has a high energy saving effect.

An embodiment of a track snow removing device A according to the present invention will be described with reference to the drawings.
1 to 6 show the first embodiment. FIG. 1 is a partial plan view of the track snow removing device A, and FIG. 2 is a side view of FIG. FIG. 3 is a front view of the branch joint 21 and the sprinkler sprinkler 23, and FIGS. 4 and 5 show an outline of the support portion. FIG. 6 shows a specific (detailed) example of the branch joint 21. FIG. 7 shows a part of the track snow removing device A as the second embodiment.

(Embodiment 1)
As shown in FIG. 1, the orbital snow removal device A according to the first embodiment includes a water supply pipe section 1 that supplies hot water, a sprinkler piping unit 2 that branches from the water supply pipe section 1, and a support section that supports the sprinkler piping unit 2. 3. The water pipe 1 includes a water pipe 13, a first pipe joint 11 that connects the water pipes 13 and 13, and a second pipe joint 12 that connects the sprinkler piping unit 2 to the water pipe 13.

  In the first embodiment, the first pipe joint 11 is mainly composed of a thermoplastic resin such as polyethylene, and is composed of an electro-fused pipe joint whose outer shape is formed in a substantially cylindrical shape. The first pipe joint 11 may be a normal socket-type electric fusion pipe joint. For example, a heating wire (not shown) is spirally provided on the inner peripheral surface of the substantially cylindrical main body, while the first pipe joint 11 is provided on the outer peripheral surface of the main body. A metal terminal (not shown) connected to the heating wire is provided to connect the water supply pipes 13 made of resin pipes.

  The first pipe joint 11 and the water pipe 13 are connected by inserting the end of the water pipe 13 into the first pipe joint 11 and connecting a metal terminal and a current-carrying device (not shown) and applying a voltage. The heating is performed by passing an electric current, heating the heating wire by Joule heat, and electrically welding the pipe joint composed of thermoplastic resins and the water supply pipe 13 to each other.

  The second pipe joint 12 is an electrofusion-type pipe joint mainly made of a thermoplastic resin such as polyethylene. The second pipe joint 12 constitutes a tees-type electrofused pipe joint in which a branch part 12a for connecting the sprinkler piping unit 2 is formed in the middle part of the cylindrical main body. Similarly to the first pipe joint 11, the second pipe joint 12 is provided with a heating wire (not shown) on the inner peripheral surface of the main body in a spiral shape, and on the outer peripheral surface of the main body, a metal terminal connected to the heating wire ( (Not shown) are provided to connect the water supply pipes 13 made of resin pipes and one end of an elbow pipe 222 (made of resin) disposed at the upstream end of the sprinkler piping unit 2.

  The connection procedure between the water pipes 13 made of resin pipes and the elbow pipe 222 (made of resin) disposed at the upstream end of the sprinkler pipe unit 2 is the same as that of the first pipe joint 11 described above. Similar to the connection with the water pipe 13, the connection is made by electric fusion.

  The water supply pipe 13 is made of a thermoplastic resin such as polyethylene, and is made of a resin pipe having a required diameter and a required length that can be engaged with a pipe joint. Since the resin tube is excellent in heat retention, it is not necessary to wrap the heat retention material around the water supply pipe portion 1 including the water supply tube 13, and the connection procedure is simplified.

  The water supply pipe portion 1 configured as described above is configured by electro-welding the first pipe joint 11 or the second pipe joint 12 and the water supply pipe 13 formed of an electric fusion-type pipe joint, as shown in FIG. It is disposed in a side groove 5 as a structure provided along the track 6. The structure that supports the water supply pipe section 1 and the sprinkler piping unit 2 may be provided in parallel with the track 6 and is not necessarily limited to the side groove 5. For example, in addition to the side groove 5, a frame body, a support member, or the like provided in parallel with the track 6 can be used.

When the side groove 5 is a structure, the water supply pipe portion 1 is normally covered with a concrete lid placed on the side groove 5. Note that the connection between the water supply pipe and the pipe joint is not necessarily limited to electrical fusion, but may be connection by adhesion or butt fusion.
The track 6 includes a track slab 62 laid or constructed on a foundation 61 and a rail 63 laid on the track slab 62, and the top end (upper surface) of the track slab 62 is higher than the bottom plate of the side groove 5.

  A hot water supply means (not shown) such as a hot water device or a pump device is connected to the upstream side of the water supply pipe section 1 (left side in FIG. 1). A plurality of configured units are arranged along the track 6 such as one unit every 2 to 3 km.

  The sprinkler piping unit 2 includes a sprinkler pipe 22, a branch joint 21 connecting the sprinkler pipes 22, 22, a sprinkler sprinkler 23 connected to the branch joint 21, and a sprinkler pipe 22 connected to the second pipe joint 12. And a drain valve 25 connected to the end of the water spray pipe 22.

  The branch joint 21 is mainly composed of a thermoplastic resin such as polyethylene, and its external shape is formed in a substantially cylindrical shape as shown in FIG. An opening connection portion 21a to which the water sprinkler 23 is connected is formed from the middle portion of the tube portion. The branch joint 21 includes a heating wire spirally provided on the inner peripheral surface of the cylinder, and a metal terminal connected to the heating wire and provided on the outer surface. An embodiment of the branch joint 21 will be described later.

The sprinkling pipe 22 includes a straight pipe 221 made of a thermoplastic resin such as polyethylene, and an elbow pipe 222 connected to the pressure reducing valve 24 and the second pipe joint 12. The straight pipe 221 and the elbow pipe 222 are both And a required diameter and required length that can be engaged with the branch joint 21, the pressure reducing valve 24, and the drain valve 25.
The connection procedure between the branch joint 21 and the resin pipe is the same as the connection between the first pipe joint 11 and the water supply pipe 13 described above. If the pressure reducing valve 24 and the drain valve 25 are made of resin, the sprinkling pipe 22 is connected by electrical fusion, but if it is made of metal, a conventional mechanical connection structure is used.

  The elbow pipe 222 described above is inserted through a hole formed in the wall surface of the side groove 5 corresponding to the position where the second pipe joint 12 is disposed, and is straight with the water supply pipe 13 disposed in a step as shown in FIG. The tube 221 is connected. Here, when the elbow pipe 222 is inserted into and engaged with the hole formed in the wall surface of the side groove 5, this portion connected to the water supply pipe section 1 becomes the fixed end K of the sprinkler piping unit 2.

  As shown in FIG. 3, the sprinkler sprinkler 23 includes a head portion 231 provided with water discharge holes and a rod portion 232 that rotatably supports the head portion 231, and the base portion of the rod portion 232 is an opening connection of the branch joint 21. It is connected to the part 21a.

  The water sprinkler 23 functions to prevent snow accumulation on the track 6 by spraying water from the head portion 231 toward the upper side of the track 6. As will be described later, the position of the sprinkler sprinkler 23 with respect to the track 6, that is, the distance to each rail 63 and the height with respect to the rail 63 are set in advance so as to obtain the maximum snow removal effect. Even if the expansion / contraction is absorbed by the free end J of the sprinkler piping unit 2, the position and angle do not change.

  The pressure reducing valve 24 is connected to the other end of the elbow pipe 222 having one end connected to the branch part 12a of the second pipe joint 12, and adjusts so that the water pressure in the water supply pipe part 1 maintains a required magnitude. .

  The drainage valve 25 is connected to the end of the water spray pipe 22 disposed at the downstream end of the sprinkler piping unit 2, and the valve is closed when the water pressure in the water supply pipe 1 is equal to or larger than a predetermined magnitude. When it becomes less than this, the valve is opened, and the remaining water in the sprinkler piping unit 2 is discharged.

  That is, when water is sprinkling from the head portion 231 onto the track 6, the water pressure in the sprinkler piping unit 2 is maintained at a predetermined pressure, so that the drain valve 25 is closed, after the last train operation, etc. When water is not sprayed on the track 6, water is not supplied to the water supply pipe section 1, so that the water pressure in the sprinkler piping unit 2 is lowered and the drain valve 25 is opened. Thereby, when water is not sprinkled, the water remaining in the sprinkler piping unit 2 is discharged, so that the water remaining in the sprinkler piping unit 2 is prevented from freezing.

  As shown in FIG. 4, the support portion 3 of the track snow removing device A is detachably connected to the support stay 31 fixed to the side groove 5, and supports the sprinkling pipe 22 together with the support stay 31. Member 32.

The support stays 31 are substantially L-shaped metal fittings protruding and fixed to the outer wall surface of the side groove 5 toward the track slab 62, and a plurality of support stays 31 are arranged at predetermined intervals so as to be located in the middle of the water spray pipe 22. The The support member 32 is a U-shaped member such as a U-bolt having a space in which the water spray tube 22 can be loosely inserted, and is disposed on the upper surface side of the support stay 31 so that the water spray tube 22 is disposed along the track 6. Connected. When a U-bolt is used as the support member 32, both ends of the U-bolt penetrate the support stay 31 and are connected to the support stay 31 by screwing a nut into a portion protruding from the lower surface thereof. The means for connecting the support member 32 to the support stay 31 is not limited to a nut.

  The water sprinkling pipe 22 placed on the support stay 31 and held in a loosely inserted state by the support member 32 can be slid in the axial direction by being not restrained by the support member 32 in the longitudinal direction (axial direction), The entire sprinkler piping unit 2 can be expanded and contracted. However, when the water sprinkling pipe 22 is excessively tightened by the support member 32, the sliding in the axial direction may be hindered. Therefore, in order to freely cause the water sprinkling tube 22 to slide, the support member 32 is preferably provided with an over-tightening prevention means 34 that limits the tightening amount of the nut.

As the overtightening prevention means 34, FIG. 4 shows an example in which a stopper piece 35 is welded and fixed to the upper surface side of the support stay 31 of the support member 32. The stopper piece 35 is locked to the upper surface of the support stay 31 as the nut is tightened, thereby preventing the nut from being tightened by a predetermined amount or more. The stopper piece 35 also prevents the support member 32 from falling in the axial direction after the sprinkling tube 22 is fastened and supported. The overtightening prevention means 34 is not limited to the stopper piece 35 as long as it has a function of not excessively fastening the water spray pipe 22 by connecting the connecting means to the support member 32. For example, FIG. 5 shows a case where a nut is welded to the support stay 31 instead of the stopper piece 35.

In FIG. 4, in order to make the water sprinkling tube 22 slide more easily after adding the overtightening prevention means 34 to the support member 32, resin-based low friction such as nylon resin or fluororesin excellent in low friction property. The member 33 is adhered to the inner peripheral surface of the U bolt and / or the upper surface of the support stay 31. In addition, in the Example, the coating 331 is given instead of sticking.

  As described above, since the position of the sprinkler sprinkler 23 provided in the sprinkler piping unit 2 is in a predesigned position, it is necessary to return to the original position again when the sprinkler piping unit 2 as a whole expands and contracts. In some cases, the low friction member 33 is supported so that it can slide easily.

Furthermore, since the position of the water sprinkler 23 changes even if the sprinkler pipe 22 is centered on the axial direction or the sprinkler pipe unit 2 rotates, it is necessary to prevent this rotation. Therefore, for example, pipe rotation prevention means such as protrusions or grooves may be provided on the inner peripheral surface of the support member (U bolt) 32.
Thus, the support part 3 is provided with the overtightening prevention means 34, so that the sprinkler piping unit 2 disposed between the support stay 31 and the support member 32 can be supported slidably in the axial direction.

  As described above, the track snow removal device A according to the first embodiment connects the water sprinkling pipes 22 to each other by electrical fusion via the branch joint 21 as shown in FIG. The sprinkler piping unit 2 configured by connecting the sprinkler sprinkler 23 to the pipe is connected to the second pipe joint 12 of the water supply pipe section 1 through the elbow pipe 222 by electric fusion, and slides in the axial direction at the support section 3. It consists of supporting freely. In addition, the length L of this sprinkler piping unit 2 reaches about one hundred tens of meters.

    With such a configuration, the upstream end of the sprinkler piping unit 2 becomes the fixed end K, while the downstream end is not restrained at all to become a free end J, and the sprinkler piping unit 2 is subjected to thermal expansion and contraction due to a change in the outside air temperature. When it is about to occur, the free end side moves according to the amount of expansion / contraction.

  Therefore, in comparison with the conventional sprinkler piping unit 2, the track snow removing device A according to the first embodiment does not cause breakage of the joint constituting the sprinkler piping unit 2, bending of the pipe, etc., and also due to expansion and contraction. It is possible to provide a track snow removing device that is lightweight and does not cause leakage of sprinkling water and that is easy to perform piping construction.

  In addition, in order to reduce the resistance when the sprinkler piping unit 2 expands and contracts, the width of the support stay 31 in the axial direction of the water spray pipe 22 is preferably as small as possible. When the resin-based low friction member 33 is attached to the upper surface of the support stay 31, the width of the low friction member 33 is similarly reduced as much as possible. As described above, it is preferable that the contact between the water spray tube 22 and the support stay 31 or the water spray tube 22 and the low friction member 33 be close to a point contact, resulting in a reduction in the weight of the member.

  Further, in the present embodiment, the low friction member 33 is a sliding bearing, but it may be a rolling bearing. For example, the sprinkler piping unit 2 is placed on a cylindrical roller that is rotatably supported by the support stay 31, or the sprinkler piping unit 2 is placed on a linear guide configured by interposing a cylindrical roller. May be placed. Also in this case, it is preferable to include a support member 32 for restricting the movement of the water spray pipe 22 in the radial direction, and the above-described U bolt or guide rod (a rod-shaped member is erected in the radial direction of the water spray pipe 22) is preferable. It is.

  In addition, the watering process of the track snow removing apparatus A according to the first embodiment is as follows. Hot water from the hot water supply means disposed upstream is supplied into the water supply pipe section 1 at a predetermined pressure, and flows into the respective sprinkler piping units 2 while being reduced in pressure by the pressure reducing valve 24. Then, warm water is sprinkled from the individual sprinklers 23 toward the upper side of the track 6 to prevent snow accumulation on the track 6. When the water supply is stopped, the water pressure in each sprinkler pipe unit 2 is lowered, so that the drain valve 25 is opened and the remaining water in the sprinkler pipe unit 2 is discharged. The freezing of residual water prevents it from freezing. In the track snow-melting device A according to the first embodiment, since the water supply pipe section 1 and the sprinkler piping unit 2 are made of resin, it has a heat retaining effect without constructing a heat retaining material. Few. Moreover, since the temperature of warm water is maintained until it reaches the sprinkler sprinkler 23, the snow removal effect is improved, and as a result, the sprinkling amount is reduced.

  Here, another embodiment of the electric fusion type branch joint 21 will be described with reference to FIG. The joint body 71 of the branch joint 21 shown here is formed using a round pipe of a required length such as polyethylene. A through hole 71a is drilled in the axially intermediate portion of the joint body 71, which is a straight pipe, and spiral grooves 71b are formed in the inner peripheral surfaces on both sides excluding the through hole 71a in the axial direction. A heating wire 73 indicated by a broken line is provided. The heating wire 73 may be resin-coated. Metal terminals 72 connected to both ends of the heating wire 73 by welding or the like are embedded in both ends of the joint body 71 so as to be exposed on the outer surfaces on both sides of the joint body 71. The heating wire 73 is disposed by being fitted into the spiral groove 71b so that both ends of both sides of the joint body 71 sandwiching the through hole 71a are dense. When a predetermined current is applied to the exposed metal terminal 72, the heating wire 73 is heated, and the joint body 71 and the resin tube B are fusion-connected.

  In the above-described example, the electric fusion joint having a structure in which the heating wire 73 is fitted into the spiral groove 71b is used, but the structure is not limited to this. For example, the heating wire 73 is wound around an inner cylinder member molded in advance by injection molding, metal terminals are connected to both ends by welding or the like, and the inner cylinder member is installed in a mold, and the joint main body 71 is configured thereby. It is also possible to manufacture an electrofusion-type pipe joint formed by integrally molding an outer cylinder member to be formed, and to form a through-hole 71a in the main body of this to form the branch joint 21.

  The resin tube B used here is a composite resin tube in which a tubular metal plate b1 provided with a plurality of holes b2 is integrated between an outer peripheral surface and an inner peripheral surface of a tube main body b3 made of a thermoplastic resin. In addition, fusion with a heating wire is possible, and thermal expansion can be suppressed while increasing mechanical strength. The tubular metal plate b1 provided with a plurality of holes b2 is mainly a punched metal or a steel plate incorporated in a net shape, but is not particularly limited. Further, since the resin pipe B (composite resin pipe) only needs to be composed of a thermoplastic resin at least on the outer peripheral surface side for fusion with the joint main body 71, a tubular metal plate b1 provided with a plurality of holes b2 is provided. Or a three-layer structure with other constituent materials on the inner peripheral surface side.

It is also possible to adjust the tube strength and inner / outer layer bonding strength according to the size and density (opening ratio) of the hole b2 or the thickness of the metal plate b1. For example, when the aperture ratio is increased, the resin connection between the inner and outer layers becomes stronger, but on the other hand, the tube strength becomes lower, and the resin tube has a larger thermal expansion coefficient than the metal tube, so that the elongation due to thermal expansion also increases. On the other hand, when the aperture ratio is small, the bonding of the resin in the inner and outer layers is low, but the tube strength is high and the elongation is small. On the other hand, increasing the thickness of the metal plate b1 increases the strength of the tube and decreases the elongation, but increases the weight of the tube. After comprehensively judging these, the aperture ratio of the hole b2 and the thickness of the metal plate b1 are determined.
At the end portion where the resin tube B is fused to the joint body 71, the metal plate b1 and water contact each other, and water or dust may enter between the tube body b3 and the heating wire 73. As a result, there is a risk of corrosion of the metal plate b1 and poor electrical fusion strength. Therefore, for example, as shown in FIG. 6, it is preferable that a ring-shaped member b4 formed of resin or other material that does not corrode is fixed to the end of the resin tube B by bonding or fitting.

  The branch portion 81 formed at the position of the through hole 71a of the joint body 71 includes a branch pipe 82, a fixture 83 that fixes the branch pipe 82 to the joint body 71, and a distance between the joint body 71 and the branch pipe 82. A spacer member 84a to be secured and a sealing means 84 to secure water tightness between the joint body 71 and the branch pipe 82 are provided. The branch pipe 82 has a substantially rectangular collar portion 82a in plan view that is curved so as to engage a metal plate-like member with the inner peripheral surface of the joint body 71 along the inner peripheral surface of the flow path hole. A cylindrical portion 82b made of a hollow metal pipe having a required length standing in the radial direction such as the vertical direction from the center of the flange portion 82a is integrally formed. The flange portion 82a and the cylindrical portion 82b are made of a metal that does not easily rust, such as stainless steel, brass, and bronze, and can be integrally formed by welding them together or by casting or forging. A male screw 82c is formed on the outer periphery of the cylindrical portion 82b. The male screw 82c is screwed into the fixing portion 83 from the midway portion in the axial direction to the upper end. The inner peripheral surface of the through hole 71a is formed between the midway portion and the lower end. An O-ring as a sealing means 84 that is in close contact is fitted.

The branch pipe 82 formed in this way is inserted from the end flow path of the joint body 71, fitted so that the cylindrical part 82b protrudes outside from the through hole 71a, and the flange part 82a is the inner peripheral surface 71d of the flow path. Is attached to the joint body 71 by being locked along.
Since the branch pipe 82 is locked to the inner peripheral surface 71d of the flow path hole in the flange portion 82a so as not to rotate about the axis, the branch pipe 82 can be stably placed upright, and rotational force and vibration It has a strong structure against external forces.

  The fixture 83 is a substantially ring-shaped metal member, and a female screw 83b that is screwed with a male screw 82c formed on the cylindrical portion 82b is formed on the inner peripheral surface from the middle portion to the lower end. On the other hand, a female thread branch connection portion 83a for connecting the sprinkler sprinkler 23 is formed on the inner peripheral surface extending from the midway portion to the upper end.

The fixing tool 83 is screwed into the male screw 82c of the cylindrical portion 82b through the spacer member 84a and the O-ring as the sealing means 84, and the peripheral portion of the through hole 71a is sandwiched between the flange portion 82a and the fixing tool 83. Accordingly, the branch pipe 82 is erected and supported in a direction orthogonal to the axis of the resin pipe B. In addition, the structure of the branch connection part 83a is suitably changed according to the watering sprinkler 23 and apparatus to connect. For example, a structure in which a ring-shaped packing is mounted instead of the spacer member 84a and the O-ring may be used, and the connecting portion is not limited to screw joining. It is good also as a fixed structure strong against rotation by inserting a locking pin.

(Test example)
Next, a test example of the track snow removing device according to the first embodiment will be described.
A thermal expansion test was performed on the sprinkler piping unit 2 according to the first embodiment under the following conditions. The purpose of the test was to confirm whether the composite resin pipe could be used for the sprinkler piping unit 2. Specifically, in an indoor model pipe made of metal reinforced polyethylene pipe (SSPE), axial extension, deflection, and twist due to thermal expansion were observed. It is to confirm and to confirm the linear expansion coefficient of the metal reinforced polyethylene pipe (SSPE) based on the test result.

The model piping schematic diagram of this test is shown in FIG. The sprinkler pipe 22 has a pipe length of 36 m, and a metal reinforced polyethylene pipe (SSPE) is used as the sprinkler pipe 22 of the sprinkler pipe unit 2 and the branch joint 21. The pipe support conditions were not restricted at both ends, and were performed under two conditions: a case where only the U band was supported at an interval of 3 m to confirm the effect of the vibration proof rubber, and a case where the vibration was supported by the U band and the vibration proof rubber. The anti-vibration rubber was laid at the part where the support stay 31 and the water spray pipe 22 contact.
The specification of the metal reinforced polyethylene pipe (SSPE) was as follows.
Outer diameter: 110mm
Wall thickness: 6mm
Material of tubular metal body: Hot rolled mild steel plate (SPHC)
Tubular metal body thickness: 1.2 mm

For metal reinforced polyethylene pipe (SSPE), as shown in Fig. 10, hot air is sent from the end and midway of the pipe and normal temperature air is heated from the inner surface of the pipe, and the tube surface temperature changes by about 60 ° C from normal temperature. I tried to do it. The amount of extension, the amount of deflection in the vertical direction, and the amount of deflection in the lateral direction were measured by attaching a swing down for every 3 m of the pipe and measuring the amount of movement of the swing down when the temperature changed. The twist was measured from the change in the angle of the stanchion at the time of temperature change by setting up a stanchion at the branch joint for every 6 m of the pipe.
The above-mentioned amount of elongation refers to the amount of elongation in the longitudinal direction of the piping, and the amount of deflection refers to the amount of deflection in the longitudinal direction of the piping as the amount of deflection in the vertical direction, and the amount of deflection in the short direction refers to the amount of lateral deflection. That's it. Moreover, a twist means the rotation angle of the circumferential direction of piping.
The test results are shown in Table 1.

試験結果より、以下の事項が確認された。
（１）管表面温度変化約６０℃において試験に用いられた金属強化ポリエチレン管の伸縮量に対する線膨張係数は鋼管の線膨張係数（1.2X10^-5K^-1）とほぼ同等の値であることが確認された。
（２）ひねりは０．３°以下の極めて微小な値であることが確認された。
（３）防振ゴムの有無による大きな差異は認められないことが確認された。
したがって、金属強化層なしのポリエチレン管を使用して熱膨張試験を行った場合に発生する顕著なたわみや伸びが発生せず、鋼管使用時とほぼ同じ伸びとたわみであることが確認された。よって金属強化ポリエチレン管（ＳＳＰＥ）を使用することは、金属強化層なしのポリエチレン管に比べ、伸びとたわみを減少させる効果があり、複合樹脂管のスプリンクラー配管ユニット２への使用は十分可能であることが確認された。

The following items were confirmed from the test results.
(1) The coefficient of linear expansion relative to the amount of expansion and contraction of the metal reinforced polyethylene pipe used for the test at a pipe surface temperature change of about 60 ° C is almost the same as the coefficient of linear expansion of the steel pipe (1.2X10 ^-5 K ^-1 ). Was confirmed.
(2) It was confirmed that the twist was an extremely minute value of 0.3 ° or less.
(3) It was confirmed that there was no significant difference due to the presence or absence of anti-vibration rubber.
Therefore, it was confirmed that there was no remarkable deflection or elongation that occurred when a thermal expansion test was performed using a polyethylene pipe without a metal reinforcing layer, and that the elongation and deflection were almost the same as when using a steel pipe. Therefore, using a metal reinforced polyethylene pipe (SSPE) has an effect of reducing elongation and deflection compared to a polyethylene pipe without a metal reinforced layer, and the use of a composite resin pipe for the sprinkler piping unit 2 is sufficiently possible. It was confirmed.

  Compared with the conventional metal sprinkler piping unit 2, the track snowplow according to the first embodiment greatly reduces the mass, so that the workability is greatly improved and the construction cost is greatly reduced. Can do. For example, the mass of metal reinforced polyethylene pipe is reduced to about 1/3 compared to steel pipe, and the mass per unit can be further reduced by using a synthetic resin branch joint.

  Further, the water supply pipe section 1 is composed of the first pipe joint 11 and the second pipe joint 12 made of electro-fusion-type pipe joints and the water feed pipe 13 made of a resin pipe. The effect of reducing the mass of the snow device A is further increased, the weight is lighter, and piping construction is easier.

  Since the water pipe section 1 is usually housed in the side groove 5 and closed with a concrete lid (the concrete lid is not shown), it is in a highly humid and corrosive environment, but a conventional metal water pipe. Instead of the metal pipe joint, the water pipe 13 made of resin pipe and the first pipe joint 11 and the second pipe joint 12 made of an electrofusion joint are used to eliminate the fear of leakage due to corrosion. .

(Embodiment 2)
Next, a second embodiment of the present invention will be described. The track snow removing device A according to the second embodiment is provided with a bent portion 4 in a part of the water supply pipe portion 1 and the sprinkler piping unit 2 of the track snow removing device according to the first embodiment, and then from a straight pipe or the like. This is an example in which a detour portion 10 that is eccentric with respect to the main line portion 9 is provided, and the other configurations are the same as those in the first embodiment, and therefore, the same reference numerals are given and detailed descriptions thereof are omitted.

  As shown in FIG. 7, the bent portion 4 is a third pipe joint made of an elbow-type electrofusion-type pipe joint formed at a required angle instead of the straight-type first pipe joint 11 constituting the water supply pipe portion 1. 41 is used, and it forms in the curved form by connecting the straight type water supply pipe | tube 13 by electric fusion. Or it forms by interposing the same 3rd pipe joint 41 as the above between branch joints 21 and 21 which constitute sprinkler piping unit 2, and connecting straight type sprinkling pipe 22 by electric fusion.

Although the bending part 4 is provided in arbitrary places, it is provided actively utilizing the place where the side groove 5 needs to bend mainly by installation of a track facility or the like. By providing the bent portion 4, even if thermal expansion and contraction due to temperature change occurs in the water supply pipe portion 1 and the sprinkler piping unit 2, the entire expansion and contraction is absorbed by the displacement of the bent portion 4. In particular, since the total length of the water supply pipe section 1 is larger than the total length of the sprinkler piping unit 2, it may be difficult to extend and contract the entire unit 2. Therefore, a structure that absorbs expansion and contraction by providing the bent portion 4 in a part of the water supply pipe portion 1 may be more appropriate.
In this embodiment, the bent portion 4 is formed by piping so as to be curved. However, a part of the water supply pipe 13 and the water spray pipe 22 is a bellows pipe (made of resin is preferable) as the bent portion 4. Also good.

In FIG. 7, the detour part 10 includes a straight line part 101 that is eccentric to the main line part 9 that is a straight pipe part and parallel to the main line part 9, and a connecting part 102 that connects the main line part 9 and the straight line part 101. In FIG. 7, the detour portion 10 is configured from the bent portion 4 using four third pipe joints 41. However, as long as the detour portion 10 is eccentric with respect to the main line portion 9, the form of the detour portion 10 is arbitrary. For example, the detour part 10 may be configured only with a bellows tube.

FIG. 8A shows a simple chevron shape formed by interposing a third pipe joint 41 between the branch joints 21 and 21 constituting the sprinkler piping unit 2 and connecting the straight-type water sprinkling pipe 22 by electric fusion. The bending part 4 which makes | forms is shown. By adopting such a bent structure, even if thermal expansion and contraction due to temperature change occurs in the sprinkler piping unit 2, the entire expansion and contraction is absorbed by the displacement of the bent portion 4.
Specifically, for example, the extension amount of the sprinkler piping unit 2 is absorbed by the third pipe joint 41 body having a bending angle of 30 ° being deformed to a bending angle of 35 °. Whether the amount of expansion / contraction is absorbed by bending the third pipe joint 41 or the movement of the entire sprinkler piping unit 2 depends on the frictional force in the support part 3 that inhibits the movement of the sprinkler pipe 22 and the bent part 4. It is determined by the balance of rigidity of the third pipe joint 41 to be configured. When the water sprinkling pipe 22 is short and the force that hinders the movement of the entire sprinkler piping unit 2 is small, the expansion and contraction at the bent portion 4 does not occur.

FIG. 8B shows a detour portion 10 that is one form of the bent portion 4 of the sprinkler piping unit 2. The detour portion 10 is supported by the support portion 3 only by the straight portion 101 which is a portion parallel to or close to the main line portion 9 (not shown). When the heat expansion and contraction due to the temperature change of the sprinkler piping unit 2 occurs and the absorption by the detour portion 10 occurs, the detour portion 10 protrudes toward the track 6 simultaneously with the change of the angle of the third pipe joint 41. Will occur. As a countermeasure,
As shown in FIG. 9, an elongated hole 36 is provided on the upper surface of the support stay 31 of the support portion 3. The support member 32 is connected to the support stay 31 by the end of the support member 32 passing through the elongated hole 36 and a nut or the like being screwed into a portion protruding to the lower surface. As a result, the support member 32 can slide in the longitudinal direction of the long hole by the length. Therefore, the water spray tube 22 placed on the support stay 31 can slide and move in the short horizontal direction (radial direction) by the length of the long hole.
As a result, even if the sprinkler piping unit 2 undergoes thermal expansion and contraction due to changes in the air temperature, and the sprinkler pipe 22 of the straight portion 101 protrudes toward the track 6 simultaneously with the change in the angle of the third pipe joint 41, the support portion 3. Can absorb the deformation. For the elongation exceeding the possible slide amount, absorption by the detour portion 10 is impossible, and the expansion and contraction is absorbed in the axial direction. In this way, by absorbing a part of the expansion / contraction amount by the detour portion 10, the movement amount of the entire sprinkler piping unit 2 can be suppressed small. In the present invention, the protruding direction of the bent portion 4 is a horizontal direction.
In addition, since only the portion parallel to the piping direction is used as the supporting portion of the piping, the axial sliding of the piping portion is facilitated, and the force to rotate the bypass portion 10 around the axis of the main line portion 9 is achieved. Therefore, the effect of preventing the occurrence of rotation (twisting) is exhibited.

(Test Example 1)
Here, a test example of the track snow removing device A according to the second embodiment will be described.
A thermal expansion test was performed on the track snow-melting device A according to the second embodiment under the following conditions. The purpose of the test is to confirm the pipe behavior in the outdoor model pipe including the detour part.

The model piping schematic diagram of this test is shown in FIG. The total length of the water sprinkling pipe 22 was 145 m, and the detour part 10 was provided every 48 m. As the pipe support conditions, only one side of the pipe was constrained and supported only by the U band at intervals of 2 m, and the two cases were supported by the U band + anti-vibration rubber. The test was performed by assembling the test pipe shown in FIG. 11 and measuring the elongation and twist caused by the change in pipe temperature due to the influence of outside air temperature and solar radiation.
A measurement target (SUS band) was attached to the pipe support, and the elongation was measured from the amount of pipe movement when the temperature changed. As for the measurement of the twist, a stanchion was set up at the branch joint for every 6 m of the pipe, and the measurement was performed from the change in the angle of the stanchion when the temperature changed. Moreover, it measured also about the temperature of the upper surface part and lower surface part of piping. The test results are shown in Table 2 and FIGS. In addition, FIG. 12 is a graph which shows the relationship between the piping position of a detour part and a linear part, and the thermal expansion amount in each position. FIG. 13 is a graph showing the relationship between the pipe positions at intervals of 6 m and the angle change amount at each position.

試験結果より、以下の事項が確認された。
（１） 試験実施日３月２９日の角度測定値を基準として、軸方向、周方向の角度変化は図１３に示すように±0.4°以下であった。測定誤差を考慮すると、配管の傾きは発生していないことが確認された。
（２） 伸びについては、図１２に示すように迂回部の形成が有効に熱膨張を吸収していることが確認された。
（３） 図１３は防振ゴム有りの試験結果を示すが、防振ゴムなしの場合も同様の結果であることが確認された。
表２に示すように配管全体の伸びの累計は５１．３ｍｍであるところ、図１２から明らかなように迂回部１０を設けたことにより、迂回部１０において熱膨張が吸収されているため、結果的に端部の伸びが２１．５ｍｍに抑えられることが確認された。

The following items were confirmed from the test results.
(1) The angle change in the axial direction and the circumferential direction was ± 0.4 ° or less as shown in FIG. Considering measurement errors, it was confirmed that there was no inclination of the piping.
(2) Regarding elongation, as shown in FIG. 12, it was confirmed that the formation of the bypass portion effectively absorbed thermal expansion.
(3) FIG. 13 shows the test results with anti-vibration rubber, but it was confirmed that the same results were obtained without anti-vibration rubber.
As shown in Table 2, the cumulative total elongation of the entire pipe is 51.3 mm. As is apparent from FIG. 12, since the bypass portion 10 is provided, thermal expansion is absorbed in the bypass portion 10. In particular, it was confirmed that the elongation at the end was suppressed to 21.5 mm.

(Test Example 2)
For the track snow removing device A according to the second embodiment, a repeated expansion / contraction test of a detour portion for the purpose of confirming the expansion / contraction resistance was also performed. FIG. 14 shows a schematic diagram of the sample size and fixing method in this test. As shown in FIG. 14, the detour portion is formed by two third pipe joints and three straight composite resin pipes that connect the straight pipe portion and the straight pipe portion by electrical fusion at an angle of 30 °. The pipe on one end side of the detour portion is completely fixed to be a fixed side, and the movable side is extendable in the axial direction of the pipe by being supported by a structure or the like only with a U band. The piping on the other end side of the detour part was connected to a stretch tester (not shown), and a reciprocating stretch test in the F direction was performed.
Table 3 shows the test conditions for the repeated stretching test.

ここで、繰返し回数は、いずれも１８２５０回であって、これは３６５日×５０年の回数に該当する。
１日変位量は１０ｍｍとした。これは熱膨張量測定における夏季の測定値に該当する。これを条件１とした（表３参照）。
季節変動量を考慮した試験条件を条件２及び条件３とした。つまり夏条件を７０℃、冬条件をー１０℃（ΔＴ＝８０℃）とし、複合樹脂管の線膨張係数を1.2×10^−５/℃とすると、迂回部間隔４８ｍの膨張量は４６ｍｍであるため、５０ｍｍ変位を与えた後に、更に変位量１０ｍｍを発生させる繰返し伸縮試験を行った。
条件２は夏季に施工された場合を想定したものであって、冬季にー５０ｍｍ移動しその状態から１日の気温変化により１０ｍｍ移動する。
条件３は条件２の逆であり、冬季に施工された場合を想定したものであって、夏季に＋５０ｍｍ移動し、その状態から１日の気温変化により１０ｍｍ移動する。
繰返し伸縮試験終了後には、管内空気圧力を２．５ＭＰａまで加圧して、２分間の耐圧試験により迂回部１０の漏れ発生の有無を確認した。
試験結果を表４に示す。

Here, the number of repetitions is 18250 times in all cases, which corresponds to the number of times of 365 days × 50 years.
The daily displacement was 10 mm. This corresponds to the summer measurement in the measurement of thermal expansion. This was defined as Condition 1 (see Table 3).
Test conditions in consideration of the amount of seasonal variation were defined as condition 2 and condition 3. That is, assuming that the summer condition is 70 ° C., the winter condition is −10 ° C. (ΔT = 80 ° C.), and the linear expansion coefficient of the composite resin pipe is 1.2 × 10 ⁻⁵ / ° C., the expansion amount of the detour interval 48 m is 46 mm. For this reason, after giving a displacement of 50 mm, a repeated expansion / contraction test for generating a displacement of 10 mm was performed.
Condition 2 assumes a case where construction is performed in the summer, and moves 50 mm in winter and moves 10 mm from the state due to a change in the temperature of the day.
Condition 3 is the reverse of condition 2 and assumes a case where it is constructed in the winter. It moves +50 mm in the summer, and moves 10 mm from that state due to a change in the temperature of the day.
After completion of the repeated expansion and contraction test, the air pressure in the tube was increased to 2.5 MPa, and whether or not the bypass portion 10 was leaked was confirmed by a pressure test for 2 minutes.
The test results are shown in Table 4.

いずれの条件においても、繰返し伸縮試験終了後の耐圧試験に合格している。
また、配管表面のこすれも軽微であり、迂回部の配管強度、表面の耐磨耗性共に問題ないことが確認された。

Under any conditions, the pressure test after the repeated stretching test is passed.
In addition, the rubbing of the piping surface was slight, and it was confirmed that there was no problem in the piping strength of the bypass portion and the wear resistance of the surface.

  The track snow removing device A according to the present embodiment has been described above, but the above-described embodiment shows an example of a preferred embodiment of the present invention, and the present invention is not limited thereto. Various modifications can be made without departing from the scope of the invention.

  For example, although the water pipe 1 of the track snow removing device A according to the present embodiment has a water pipe and a joint made of resin, such a constituent part as in the past may be made of metal. That is, at least the sprinkler piping unit 2 only needs to be made of resin. Further, the connection between the branch joint 21 of the sprinkler piping unit and the water sprinkling pipe 22 is not limited to electric fusion, but may be connection by butt fusion using a butt fusion machine in addition to joining using an adhesive.

1 is a plan view of a track snow removal device according to a first embodiment. It is principal part sectional drawing of FIG. It is an enlarged front view of a branch joint part. It is a principal part expanded sectional view of a support part. It is a principal part expanded sectional view of the support part in another form. It is a perspective sectional view showing other examples of a resin branch joint. It is a top view of the orbital snow removal apparatus concerning Embodiment 2. It is a top view of a sprinkler piping unit, (a) is a top view of a simple bending structure, (b) is a top view of a detour part. It is a figure of the support part in another form, Comprising: (a) is a top view of a support part, (b) is a principal part expanded sectional view of a support part. It is a side view of model piping of a thermal expansion test. It is the outdoor model piping schematic diagram of a thermal expansion test, Comprising: (a) is a whole top view, (b) is an enlarged plan view of a detour part (dashed line circle part). It is a graph which shows the variation | change_quantity at the time of pipe expansion of a thermal expansion test, Comprising: (a) is a graph which shows the relationship between a piping position and the thermal expansion amount of each position, (b) is a schematic diagram which shows the model of a test. . It is a graph which shows the variation | change_quantity at the time of pipe expansion of a thermal expansion test, Comprising: (a) is a graph which shows the relationship between a pipe position and the axial direction angle variation | change_quantity of each position, (b) is a pipe position and the circumference of each position. It is a graph which shows the relationship with a direction angle change amount. It is a side view of model piping of a detour part repeated expansion-contraction test.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1: Water supply pipe part 10: Detour part 11: 1st pipe joint 12: 2nd pipe joint 12a: Branch part 13: Water supply pipe 2: Sprinkler piping unit 21: Branch joint 21a: Opening connection part 22: Sprinkling pipe 221: Straight Pipe 222: Elbow pipe 23: Sprinkler sprinkler 231: Head part 232: Rod part 24: Pressure reducing valve 25: Drain valve 3: Support part 31: Support stay 32: Support member 33: Low friction member 34: Overtightening prevention means 35: Stopper piece 36: long hole 4: bent part 41: third pipe joint 5: side groove 6: raceway 61: foundation 62: raceway slab 63: rail 71: joint body 71a: through hole 71b: spiral groove 72: metal terminal 73: Heating wire 81: Branching part 82: Branching pipe 82a: Gutter part 82b: Tube part 82c: Male screw 83: Fixing tool 84: 84a: Spacer member 9: Main line part 10: Detour part 101: Straight line part 102: Connection part A: Orbital snowblower B: Resin pipe b1: Metal plate b2: Hole b3: Pipe body K: Fixed end J: Free end

Claims (7)

A water supply pipe part in which water pipes arranged along a track are connected via a pipe joint, and a branch joint in which water spray pipes arranged in parallel with the water pipe part have an opening in the upper part. And a sprinkler piping unit in which a sprinkler sprinkler is connected to the opening.
One end of the sprinkler piping unit is connected to the water supply pipe portion to be a fixed end, the other end is a free end, and is supported by the structure so as to be slidable in the axial direction from the fixed end. An orbital snow removal device characterized by that.   At least a connection part of the water spray pipe and / or the water pipe includes a thermoplastic resin, and the branch joint and / or the pipe joint and the water pipe and / or the water pipe are electrically fused. The track snow removing device according to claim 1.   The water spray pipe and / or the water supply pipe is a composite resin pipe in which a tubular metal plate is interposed in a part of a thickness direction of a pipe main body having at least an outer peripheral surface made of a thermoplastic resin. Item 3. An orbital snow removal device according to item 1 or 2. A support member that is disposed in the middle of the sprinkler pipe and holds the sprinkler pipe unit;
The track snow-removing device according to any one of claims 1 to 3, wherein the support member includes an over-tightening prevention unit that prevents over-tightening of the water spray pipe. 5. The track snow extinguishing according to claim 1, wherein the water supply pipe section and / or the sprinkler piping unit has a main line section and a detour section eccentric to the main line section. apparatus. 6. The track snow extinguishing apparatus according to claim 5, wherein the water supply pipe section and / or the sprinkler piping unit is supported by a structure at a portion parallel to or close to the main line section of the detour section.   The track snow-melting device according to claim 5 or 6, wherein the water supply pipe portion and / or the sprinkler piping unit includes a bent portion capable of absorbing a part of expansion and contraction in the axial direction.

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