JP2017180709A - Insulation piping for water supply and construction method for heat insulation piping for water supply - Google Patents

Abstract

The present invention provides a heat-insulating piping for water supply that can be easily constructed and has good fire resistance and heat insulation performance. SOLUTION: A pipe 10, a heat insulating material 20 provided on the outer peripheral side of the pipe 10, and a metal tube 40 provided on the outer peripheral side of the heat insulating material 20 are provided. Is a sheet-like heat insulating material in which the inner layer 20a and the outer layer 20b of the heat insulating material 20 are covered with the resin film 30, and the resin film 30 is a bag-like resin member, and is maintained at a predetermined pressure, for example, lower than atmospheric pressure. Has been. [Selection] Figure 1

Description

  The present invention relates to a water supply heat insulation pipe whose pipe is covered with a heat insulating material, and a construction method of the water supply heat insulation pipe.

  Conventionally, resin pipes such as polyethylene pipes are generally used for pipes for supplying and distributing water. Since polyethylene pipes for water distribution may be deformed due to the influence of heat and the performance may be reduced, especially when used as fire extinguishing pipes, they are often laid and used in locations that are not affected by the heat of fire. . For this reason, for example, it is laid only in the ground in the case of the outdoors and limited to the nonflammable ceiling or the like in the case of the indoors.

  Further, Patent Document 1 has a fire extinguishing pipe having a reinforcing layer and a protective layer, and using a fiber-based heat insulating material such as ceramic fiber, a foamed heat insulating material, and an inorganic heat insulating material to improve fire resistance. It is disclosed (for example, Patent Document 1).

JP 2012-251628 A

  Fire extinguishing pipes as disclosed in Patent Document 1 described above are often used for extinguishing large-scale facilities such as large-scale plants and nuclear power plants. In such large-scale facilities, in many cases, the piping is complicated and complicated, so it is necessary to develop a construction method that allows simple construction and a structure of a polyethylene pipe for water distribution having a structure used for this construction method. It was desired.

  The object of the present invention is made in view of the above-described problems, and provides a heat-insulating pipe that can be easily constructed and has good fire resistance and heat insulation performance, and a method for constructing the water-insulating pipe. With the goal.

  The heat-insulating piping for water supply according to the present invention includes a pipe, a heat insulating material provided on the outer peripheral side of the pipe, and a metal tube provided on the outer peripheral side of the heat insulating material, and the heat insulating material is a resin film. The heat insulating material is a sheet-like heat insulating material that is disposed between the two layers, and the surface of the heat insulating material is covered with the resin film layer.

  According to the above configuration, since the surface of the heat insulating material is covered with the resin film layer, the heat insulating material is easily compressed by, for example, reducing the pressure of the resin film layer, and the space between the pipe and the metal tube is filled with no gap. It is possible to improve both fire resistance and heat insulation performance.

  In addition, when the heat insulating material absorbs moisture, the fireproof performance is maintained, but as described above, since it is waterproofed by the resin film layer, it is possible to prevent deterioration of the heat insulating performance due to water.

  Moreover, in the heat-insulating piping for water supply according to the present invention, the resin film is a bag-like resin member, and is preferably held at a predetermined pressure equal to or lower than atmospheric pressure.

  Moreover, in the water supply heat insulating pipe according to the present invention, the heat insulating material is preferably made of at least one of ceramic fiber, biosoluble fiber, rock wool, glass wool impregnated with silica airgel, and glass wool. . As the bag-shaped resin member, a resin member having low moisture permeability may be used, or a bag-shaped resin member laminated with an aluminum foil or a bag-shaped resin member deposited with aluminum may be used.

  Moreover, in the heat-insulating piping for water supply according to the present invention, the heat insulating material includes a first heat-insulating layer in which at least one of rock wool, glass wool impregnated with silica airgel, and glass wool is disposed on the piping side, and ceramic. It is preferable to have a second heat insulating layer in which at least one of a fiber and a biosoluble fiber is disposed on the metal tube side.

  Moreover, in the heat-insulating piping for water supply according to the present invention, the heat insulating material has a heat insulating layer made of at least one of polystyrene foam, rigid urethane foam, phenol foam, and foamed plastic heat insulating material on the side closest to the piping. It is preferable.

  Moreover, in the heat-insulating piping for water supply according to the present invention, the resin film is a resin film made of at least one thermoplastic resin of polyethylene, polypropylene, polyethylene terephthalate, polystyrene, polyvinyl chloride, and polyamide, or aluminum in the resin film. It is preferable to consist of the film which laminated | stacked.

  Further, in the water supply heat insulating pipe according to the present invention, the pipe has a polyethylene pipe or a polyethylene having a reinforcing band formed by winding at least one of a steel strip, a polyarylate fiber, and an aramid fiber around the polyethylene pipe. A tube is preferred.

  In the heat-insulating piping for water supply according to the present invention, the metal pipe is preferably a spiral duct steel pipe or a seamless steel pipe. Here, in order to prevent water from entering the pipe from the goby part formed in the metal pipe, the spiral duct steel pipe is waterproofed by providing a packing on the goby part, or waterproofed on the outer circumference of the goby part. It is preferable to perform waterproofing by winding a tape.

  Moreover, the construction method of the heat insulation piping for water supply which concerns on this invention is the 1st process which prepares the cylindrical member by which the bag-shaped resin member in which the heat insulating material was inserted in the compression state was wound around piping, The said cylindrical member A second step of inserting the inside of the metal pipe, and after completion of the second step, the heat insulating material charged in the bag-like resin member is released from the compressed state, and the heat insulating material is connected to the pipe and the metal pipe. And a third step of filling between.

  According to the said structure, in order to coat | cover the surface of a heat insulating material with a resin film layer, it compresses a heat insulating material easily, such as reducing the pressure of a resin film layer, and it is filled without gap between piping and a metal pipe. It is possible to improve both fire resistance and heat insulation performance.

  In addition, the thermal insulation performance is maintained even if moisture is absorbed, but since the thermal insulation performance is reduced due to water absorption, as described above, it is waterproofed by the resin film layer. Can be prevented. Here, if a resin member with low moisture permeability is used as the bag-shaped resin member, or a bag-shaped resin member laminated with aluminum foil or a bag-shaped resin member deposited with aluminum is used, deterioration of heat insulation performance due to moisture absorption is prevented. can do.

  Moreover, in the construction method of the heat insulation piping for water supply which concerns on this invention, the said 1st process decompresses the said bag-shaped resin member in which the said heat insulating material was inserted, and compresses the said heat insulating material, and the said heat insulating material. After compressing, it is preferable to have a step of winding the bag-shaped resin member around the pipe to prepare the cylindrical member.

  Moreover, in the construction method of the heat insulation piping for water supply which concerns on this invention, the said 1st process winds the said bag-shaped resin member with which the said heat insulating material was inserted to the said piping, The said bag-shaped resin member is the said It is preferable to have a step of preparing the cylindrical member by deflating the bag-shaped resin member and compressing the heat insulating material after winding the pipe.

  Moreover, in the construction method of the water supply heat insulation piping which concerns on this invention, in the said 1st process, it is preferable to compress the said heat insulating material by crushing the said resin member on a bag from the outside.

  Moreover, in the construction method of the heat-insulating piping for water supply according to the present invention, in the first step, after the bag-shaped resin member is depressurized, the opening of the bag-shaped resin member is closed, thereby compressing the heat insulation. The material is sealed, and in the third step, the opening of the bag-shaped resin member is opened to open the sealed state of the bag-shaped resin member, and the heat insulating material is connected to the pipe and the metal tube. It is preferable to fill in between.

  Moreover, in the construction method of the heat-insulating piping for water supply according to the present invention, in the first step, the bag-shaped resin member is degassed and decompressed to compress the heat insulating material in the thickness direction, and the first step In the third step, the degassing from the opening of the bag-shaped resin member is stopped, and air is introduced from the opening to bring the inside of the bag-shaped resin member to atmospheric pressure or a predetermined pressure less than atmospheric pressure. It is preferable to expand the compressed heat insulating material in the thickness direction by restoring the pressure so that the density of the heat insulating material is higher than the density of the heat insulating material before decompression.

  Moreover, in the construction method of the heat-insulating piping for water supply according to the present invention, in the first step, the bag-shaped resin member is depressurized while degassing, and the bag-shaped resin member is maintained in a reduced pressure state, The cylindrical member obtained by compressing the heat insulating material in the thickness direction may be inserted into the metal tube. In the third step, the degassing from the opening of the bag-shaped resin member is stopped, and air is introduced from the opening, so that the interior of the bag-shaped resin member is at atmospheric pressure or less than atmospheric pressure. Thus, the compressed heat insulating material is expanded in the thickness direction, and the density of the heat insulating material can be made higher than the density of the heat insulating material before decompression.

  Furthermore, in the construction method of the heat-insulating piping for water supply according to the present invention, a first step of preparing a cylindrical member in which a bag-shaped resin member in which a heat insulating material is sealed in a compressed state is wound around the piping, and the cylindrical member A second step of inserting the inside of the metal pipe, and after completion of the second step, the heat insulating material is connected to the pipe using the gas permeability of the bag-like resin member while the bag-like resin member is kept sealed. It can also be set as the construction method of the heat insulation piping for water supply which has a 3rd process filled with air between the said metal pipes.

  ADVANTAGE OF THE INVENTION According to this invention, the construction method of the water supply heat insulation piping which can be constructed simply and has favorable fireproof performance and heat insulation performance, and the said water supply heat insulation piping can be provided.

FIG. 1 is a cross-sectional view of a water supply heat insulating pipe 1 according to the present embodiment. FIG. 2 is a layout diagram of a heat insulating sheet for explaining a process of sealing the heat insulating material 20 with a bag-shaped resin member (resin film 30). FIG. 3 is a layout diagram of the heat insulating sheet in the bag-shaped resin member (resin film 30) for explaining the process of compressing the heat insulating material 20. FIG. FIG. 4 is a diagram for explaining a process of winding the heat insulating material 20 around the pipe 10. FIG. 5 is a diagram illustrating a cross-sectional structure of the heat insulating sheets 21 to 26 when wound around the pipe 10. FIG. 6 is a view for explaining a process of inserting a cylindrical member in which the heat insulating material 20 is wound around the pipe 10 into the metal tube 40. FIG. 7 is a diagram for explaining a metal tube according to a modification.

  A mode for carrying out the present invention (hereinafter referred to as the present embodiment) will be described with a specific example. The present embodiment relates to a heat-insulating pipe for water supply in which the pipe is covered with a heat insulating material, and a method for constructing the heat-insulating pipe for water supply.

  FIG. 1 is a cross-sectional view of a water supply heat insulating pipe 1 according to the present embodiment. As shown in FIG. 1, the water supply heat insulating pipe 1 includes a pipe 10, a heat insulating material 20 provided on the outer peripheral side of the pipe 10, and a metal tube 40 provided on the outer peripheral side of the heat insulating material 20.

  The pipe 10 is a thermoplastic resin pipe such as a polyethylene pipe, and is arranged along a predetermined water distribution path. Specifically, as a material of the pipe 10, a polyethylene pipe is used, or a polyethylene pipe having a reinforcing strip formed by winding at least one of a steel strip, a polyarylate fiber, and an aramid fiber around the polyethylene pipe. It is preferable to use.

  The heat insulating material 20 is a sheet-shaped heat insulating material, and preferably has a heat insulating material density and thickness so as to satisfy the fire resistance performance for 30 minutes heating according to the standard curve of JIS A1304 (fire resistance test method for building structure part). It is a member that can be used by appropriately adjusting the thickness. Specifically, as the heat insulating material 20, for example, a material having high heat insulating performance and fire resistance such as ceramic fiber, biosoluble fiber, rock wool, glass wool impregnated with silica airgel, and glass wool is used. More specifically, as will be described later, the heat insulating material 20 is a first heat insulating layer in which at least one of rock wool, glass wool impregnated with silica airgel, and glass wool is disposed on the pipe 10 side, and ceramic fiber. It is preferable that at least one of the biosoluble fibers is a second heat insulating layer disposed on the metal tube 40 side. Further, in addition to the first and second heat insulating layers, the heat insulating material 20 is provided on the side closest to the pipe 10 with a heat insulating layer made of at least one of polystyrene foam, hard urethane foam, phenol foam, and foamed plastic heat insulating material. Can have.

  As shown in FIG. 1, the heat insulating material 20 is disposed between the layers of the resin film 30, and the inner layer 20 a and the outer layer 20 b of the heat insulating material 20 are covered with the resin film 30. Here, the arrangement of the butted portions at both ends of the plurality of (6 in the example of FIG. 1) heat insulating sheets 200 constituting the heat insulating material 20 is desirably shifted by a predetermined interval for each heat insulating sheet 200. By arranging the abutting portions at both ends of the heat insulating sheet 200 in this manner, heat intrusion from the gaps between the abutting portions at both ends of the heat insulating sheet 200 is provided at the same position in the circumferential direction. It can be relaxed more than the case. Moreover, the length of each heat insulation sheet 200 is the calculation of the outer peripheral part at the time of winding to piping so that there may be no gap in the butting | matching part of the both ends of each heat insulation sheet 200 when each heat insulation sheet 200 is wound around piping. It is necessary to design according to the circumference, or to make it slightly longer. In this way, by designing the length of each heat insulating sheet 200, it is possible to prevent the formation of a gap between the butted portions of each heat insulating sheet 200. At this time, the length of each heat insulating sheet 200 is made to coincide with the circumferential length of the outer peripheral portion at the time of winding, or slightly larger than the circumferential length of the outer peripheral portion is made to substantially coincide with the circumferential length of the inner peripheral portion. This is because a gap is formed at the abutting portion of each heat insulating sheet 200, and heat intrusion from the abutting portion is likely to occur. At this time, the circumferential length of the inner peripheral portion of each heat insulating sheet 200 is slightly longer than the length necessary for winding the inner peripheral portion, but both ends of the heat insulating sheet 200 are pushed by pushing the butted portions of each heat insulating sheet 200. Since the portion is compressed in the length direction of the heat insulating sheet 200 and the heat insulating material in the vicinity of the compressed portion is slightly densified, the extra length generated in the inner peripheral portion of each heat insulating sheet 200 can be absorbed.

  The resin film 30 is a bag-shaped resin member, and specifically, is preferably maintained at a predetermined pressure equal to or lower than atmospheric pressure, as will be described later. Moreover, as a material of the resin film 30, the film which consists of at least 1 sort (s) of thermoplastic resin of a polyethylene, a polypropylene, a polyethylene terephthalate, a polystyrene, a polyvinyl chloride, and a polyamide can be used, for example. Specifically, a two-layer bag-shaped resin member in which polyethylene is disposed in the inner layer and polyamide is disposed in the outer layer can be used. Moreover, as the resin film 30, you may use the resin member with low moisture permeability, or the bag-shaped resin member which laminated | stacked aluminum foil, or the bag-shaped resin member which vapor-deposited aluminum. Here, the resin film 30 preferably has a film thickness of 0.05 mm or more in order to ensure durability.

  The metal tube 40 is a metal tubular body provided on the outer peripheral side of the heat insulating material 20 as described above in order to achieve fire resistance. It is preferable that the metal pipe 40 is comprised from a spiral duct or a seamless steel pipe.

  Next, the concrete construction method of the water supply heat insulation piping 1 which consists of the above structures is demonstrated.

  First, as shown in FIG. 2A, the heat insulating material 20 is hermetically sealed with a bag-shaped resin film 30, in other words, a bag binding (opening portion 30a of the bag-shaped resin film 30 is closed). In this step, the heat insulating material 20 uses, for example, six heat insulating sheets 21 to 26 as shown in FIG. As is clear from the winding process described later, the heat insulating sheets 21 to 26 have the same shape and are slightly shifted in the longitudinal direction. In particular, as shown in FIG. 2B, the heat insulating sheets 21, 22, 23, 24 , 25, and 26 in the order of 1/6 in the longitudinal direction.

  2B shows that in the process of sealing the bag resin member (resin film 30), the heat insulating sheets 21 to 26 are laminated and wound around the outer periphery of the pipe 10 at intervals in the circumferential direction. It is the figure which showed the example of arrangement | positioning of 21-26. In other words, FIG. 2 (B) is each heat insulation sheet 21-26 which comprises the heat insulating material 20 in the bag resin member (resin film 30) at the time of sealing before winding around the piping 10, Comprising: The arrangement | positioning which shifted the arrangement | positioning of the clearance gap of the butting | matching part which both ends of 26 contact | abut at the predetermined space | interval is shown. As described above, the arrangement of the gaps of the abutting portions where both ends in the circumferential direction of the heat insulating sheet abut can be shifted so as to be equiangular in the circumferential direction for each layer according to the number of laminated heat insulating sheets. Specifically, when the six heat insulating sheets 21 to 26 are wound around the pipe 10, a structure of a heat insulating material in which the butted portions of the heat insulating sheets 21 to 26 are arranged at intervals of 60 ° is obtained. In this case, it is necessary to increase the length of each heat insulating sheet 21 to 26 to be laminated in order from the inner layer to the outer layer by two times the sheet thickness so as to correspond to the increase in the peripheral length of each layer at the time of winding the heat insulating sheet. There is. Thus, when the heat-insulating piping 1 for water supply is heated by providing the butted portions at both ends of the heat-insulating sheets 21 to 26 at predetermined intervals, the length of the butted portions at both ends in the longitudinal direction of the heat-insulating sheets 21 to 26 is increased. The most effective prevention of heat intrusion from the gap.

  In addition, about each layer (6 layers in this example) which comprises the heat insulating material 20, not only the case where the heat insulation sheet which comprises each layer is one sheet member, but arbitrary number of sheet members are connected to a longitudinal direction. It may be combined. For example, in the example illustrated in FIG. 2B, the outermost heat insulating sheet 26 is longer than the innermost heat insulating sheet 21, and may be formed of two sheet members. In this way, by joining together any number of sheet members, it is not necessary to prepare a sheet having a length dedicated to each layer, and it is possible to easily wrap a heat insulating material around a pipe having an arbitrary diameter without a gap. it can. Here, “joining” in the present embodiment is not necessarily limited to joining with an adhesive or the like, and may be arranged together. For this reason, when using an arbitrary number of sheet members connected in the longitudinal direction as the heat insulating sheet 26, the arrangement of the abutting portions (including the connecting portions) of the heat insulating sheets between adjacent layers is the same position in the circumferential direction. It is necessary not to become.

  FIG. 3 is an explanatory diagram of a process of compressing the bag-shaped resin member (resin film 30). Subsequently, as shown in FIG. 3, the heat insulating material 20 is compressed by reducing the pressure inside the bag-shaped resin film 30 in a state where the heat insulating material 20 is sealed with the bag-shaped resin film 30. Specifically, the nozzle 55 of the suction device 50 is inserted into the opening 35 provided in the bag-shaped resin member made of the resin film 30, and the air inside the bag-shaped resin film 30 is sucked by the nozzle 55, that is, The heat insulating material 20 is compressed by reducing the pressure by degassing the resin film 30.

  Then, as shown in FIG. 4, the resin film 30 extended from the edge part of the longitudinal direction of the heat insulating material 20, ie, the resin film 30 extended from the short side 21a of the side in which the heat insulation sheet 22 of the heat insulation sheet 21 is not superimposed. Then, the pipe 10 is bonded with the tape 36. Then, by rotating the pipe 10, the heat insulating sheets 21, 22, 23, 24, 25, and 26 are wound around the pipe 10.

  Here, the cross-sectional structure of the heat insulating sheets 21 to 26 when wound around the pipe 10 is shown in FIG. As shown in FIG. 5, the heat insulating sheets 21 to 26 are wound around the outermost periphery from the innermost periphery while shifting by 60 ° in the circumferential direction. As described above, this is because the gaps 211, 221, 231, 241, 251, and 261 of the abutting portions where both ends in the longitudinal direction abut in the order of the heat insulating sheets 21, 22, 23, 24, 25, 26 This is because, as shown in FIG. 5, the layers are stacked so as to be shifted by 60 ° for each layer and arranged on the outer periphery of the pipe 10 in positions circumferentially divided by (1/6). FIG. 5 shows a case where a six-layer heat insulating sheet is wound, but the number of layers of the heat insulating sheet wound around the pipe is not limited to six layers, and may be five layers, for example, a single heat insulating sheet for each layer is formed. Then, when the five-layer heat insulating sheet is wound, the arrangement interval of the butted portions at both ends of the heat insulating sheet of each layer is 72 °. Thus, the arrangement | positioning space | interval of the butt | matching part of a heat insulation sheet can be suitably changed with the kind of insulation, coating thickness, etc.

  In addition, a heat insulating layer may be formed by winding a plurality of heat insulating sheets around a pipe without overlapping in the thickness direction, or by winding a heat insulating sheet having a layer thickness around a pipe, for the following reason It is preferable that the heat insulating sheets 21, 22, 23, 24, 25, and 26 are laminated in the order of (1/6) the length of the heat insulating sheet in the longitudinal direction. Here, even when a plurality of heat insulating sheets are superposed, three heat insulating sheets 21, 22, and 23 are superposed in this order, packed in a bag-like resin member, wound around the pipe 10, and sealed after decompression. In addition, three heat insulating sheets 24, 25, and 26 may be superposed in this order, packed in a bag-like resin member, wound around the pipe 10, and sealed after use under reduced pressure. Thus, the density of a heat insulating material can be varied with each bag-shaped resin member by separately packing a plurality of bag-shaped resin members with a heat insulating material.

  In addition, when the heat insulating sheets 21 to 26 are wound, the thickness of the heat insulating material 20 is not uneven as compared to the case where a total of six heat insulating materials are not overlapped in the thickness direction and wound six times. The heat insulating material 20 can be wound around the pipe 10. That is, since the thickness in the radial direction is not uneven, it is possible to prevent the piping 10 from being eccentric with respect to the metal tube 40.

  Furthermore, when a heat insulating sheet having a layer thickness is wound around a pipe as a heat insulating material, a gap is generated at both ends in the longitudinal direction of the heat insulating sheet, and the heat insulating path is lowered because the gap serves as a heat transfer path. Resulting in. On the other hand, when the heat insulating sheets 21 to 26 are wound, gaps may be generated at both ends in the longitudinal direction of the individual heat insulating sheets 21 to 26, but the heat insulating sheets 21 to 21 excluding the outermost periphery (the heat insulating sheet 26). 25 Since the clearance gap which arises in the both ends of each is covered with the heat insulation sheet | seat immediately above, the fall of heat insulation performance can be suppressed. Here, the heat insulation sheet can be arranged by shifting each layer of the heat insulation sheet 200 at a predetermined interval as shown in FIG. 1, but more desirably, the arrangement interval of the heat insulation sheets 21 to 26 of each layer as shown in FIG. 6. In order to maximize the temperature, it is desirable to dispose the heat insulating sheets 21 to 26 while being shifted by 60 °. By doing in this way, since the clearance of the both ends of the longitudinal direction of each layer of the heat insulation sheets 21-26 can be provided in the most separated position, the heat | fever penetration | invasion from the clearance gap of the both ends of the heat insulation sheets 21-26 more It can be effectively prevented.

  Subsequently, as shown in FIG. 6, the tubular member in which the heat insulating material 20 is wound around the pipe 10 is inserted into the metal tube 40, and the heat insulating material 20 charged in the bag-shaped resin film 30 is removed from the compressed state. The heat insulating material 20 is filled between the pipe 10 and the metal pipe 40 by being released. The metal tube 40 is a metal tubular body formed by connecting the goby portions 45, 45 of adjacent metal tube bodies. FIG. 6 shows an example in which the goby portion 45 is provided spirally with respect to the tube axis direction. Here, in order to prevent intrusion of water from the goby portion 45 into the pipe, the gouge portion 45 is provided with a packing to be waterproofed or waterproofed by wrapping a waterproof tape around the outer face of the goby portion 45. It is preferable. In addition, as the metal tube 40, a metal tube or a seamless steel tube in which the goby portion 45 is provided in a short length perpendicular to the tube axis direction can also be used. If a spiral duct steel pipe is used for the outer pipe, the rib 45 is formed in the longitudinal direction of the metal pipe 40 by the gouge portion 45 and the cross section of the pipe is reinforced, so that the metal pipe 40 is thin and has high rigidity. be able to. In order to improve the corrosion resistance of the metal tube 40, it is desirable to use a galvanized steel sheet in which the surface of the metal tube 40 is galvanized as a material for the metal tube 40.

  Specifically, in order to fill the insulating material 20 between the pipe 10 and the metal tube 40, by opening the opening 35 of the bag-shaped resin film 30 after decompressing the bag-shaped resin film 30, The sealed state of the bag-shaped resin film 30 is opened. That is, by stopping the deaeration from the opening 35 of the bag-shaped resin film 30 and introducing air from the opening 35, the interior of the bag-shaped resin film 30 is at atmospheric pressure or a predetermined pressure less than atmospheric pressure. By returning to the pressure, the compressed heat insulating material 20 is expanded in the thickness direction, and the density of the heat insulating material 20 is made higher than before the pressure reduction. More specifically, the refractory material is preferably compressed so that the compression ratio is in the range of 5% to 80% as compared with that before decompression. This is a compression ratio of 5% or less, which may result in damage to heat insulation performance or fire resistance performance due to fiber breakage, etc., if the compression ratio exceeds 80% and is compressed too much compared to before decompression. This is because the expansion amount of the heat insulating material at the time of return pressure becomes unstable. Thus, by compressing so that a compression rate may be in the range of 5% to 80%, the heat insulating material 20 can be filled in a high density between the pipe 10 and the metal pipe 40 in a later-described process, and the external pressure strength is further increased. Can be improved. Moreover, the density of the heat insulating material 20 can be suitably adjusted according to the design of the outer diameter and heat insulating performance of the water supply heat insulating pipe 1.

  Specifically, filling the heat insulating material 20 between the pipe 10 and the metal pipe 40 is not limited to the case where the degassing from the opening 35 of the resin film 30 is stopped and the air is introduced from the opening 35. For example, if a resin film having gas permeability is used, the heat insulating material can be filled between the pipe and the metal pipe over time even if there is no opening. Specifically, if a predetermined time elapses after a cylindrical member wound around a pipe is inserted into the inside of the metal tube, air is introduced due to the gas permeability of the resin film and the decompressed state is released. Thus, air can be filled between the pipe and the metal pipe. Polyethylene, polystyrene, polyethylene or the like can be used as the resin having high gas permeability. For example, low density polyethylene (LDPE), polystyrene (PS), unstretched polypropylene (CPP), high density polyethylene (HDPE), biaxially stretched polypropylene (OPP), or the like is used.

  As mentioned above, since the surface of the heat insulating material is covered with the resin film layer, the heat-insulating piping 1 for water supply constructed by the method described with reference to FIGS. 2 to 6 depressurizes the resin film layer. Thus, the heat insulating material can be easily compressed and filled without any gap between the pipe and the metal pipe, and both the fire resistance performance and the heat insulation performance can be improved.

  In addition, the thermal insulation performance is maintained even if moisture is absorbed, but since the thermal insulation performance is reduced due to water absorption, as described above, it is waterproofed by the resin film layer. Can be prevented. Here, if a resin member with low moisture permeability is used as the bag-shaped resin member, or a bag-shaped resin member laminated with aluminum foil or a bag-shaped resin member deposited with aluminum is used, deterioration of heat insulation performance due to moisture absorption is prevented. can do.

  Moreover, about the heat insulating material near the piping 10, even if it uses a material with a low heat resistant temperature compared with the heat insulating material near the metal tube 40 away from the piping 10, the heat resistance performance of the heat insulating material 20 as a whole is large. Since it does not decrease, it is preferable to use a material having a low thermal conductivity regardless of the heat-resistant temperature. On the other hand, the heat insulating material near the metal tube 40 is preferably made of a material having a high heat resistance temperature, even if the heat conductivity is higher than that of the heat insulating material close to the pipe 10.

  For example, for the heat insulating sheets 21 and 22 provided on the closest side of the pipe 10, compared to the heat insulating sheets 23 to 26, a material having a low heat resistance but low thermal conductivity, specifically, polystyrene foam, hard urethane. At least one material of foam, phenol foam, and foamed plastic insulation is used. About the heat insulation sheets 23 and 24 on the side next to the pipe 10 next to the heat insulation sheets 21 and 22, compared with the heat insulation sheets 25 and 26, a material having a low heat resistance but low thermal conductivity, specifically, a lock At least one material of wool, glass wool impregnated with silica airgel, and glass wool is used. About the heat insulation sheets 25 and 26 provided in the side close | similar to the metal pipe 40 away from the piping 10, at least 1 sort (s) of a ceramic fiber and biosoluble fiber is used.

  Thus, in the water supply heat insulation piping 1, as described above, by combining the heat insulating materials made of different materials, for example, the sheet thickness of the heat insulating sheets 21 and 22 is maintained while maintaining both the heat resistance performance and the heat insulation performance. Can be thin. That is, the overall thickness of the heat insulating material 20 can be reduced while maintaining both the heat resistance performance and the heat insulation performance.

  In addition, in this embodiment, not only the method demonstrated using the said FIGS. 2-6, but a various change is possible. For example, after winding the bag-shaped resin film 30 around the pipe 10, the bag-shaped resin film 30 may be decompressed to compress the heat insulating material 20 to prepare a cylindrical member.

  Moreover, about the process which compresses the heat insulating material 20, you may compress the heat insulating material 20 not only when reducing the pressure of the bag-shaped resin film 30 but crushing the resin film 30 on a bag from the outside.

  Further, the tubular member in which the heat insulating material 20 is wound around the pipe 10 is not limited to being inserted into the inside of the metal tube 40. As a metal tube, for example, as shown in FIG. The bodies 51 and 52 may be used. That is, the cylindrical member around which the heat insulating material 20 is wound around the pipe 10 is sandwiched between the divided tubular bodies 51 and 52 from the vertical direction. And you may fasten with the fastening member 60 which consists of a volt | bolt and a nut in the state which faced the flange part 511 of the division | segmentation tubular body 51, and the flange part 512 of the division | segmentation tubular body 52. FIG. By using the divided tubular bodies 51 and 52 in this way, for example, even if the contracted heat insulating material 20 starts to expand, it can be reliably sandwiched.

  Furthermore, as long as the heat insulating material 20 is provided between the pipe 10 and the metal pipe 40, other members may be interposed. For example, an impact absorbing material may be provided between the heat insulating material 20 and the pipe 10 or between the heat insulating material 20 and the metal pipe 40.

DESCRIPTION OF SYMBOLS 1 Heat insulation pipe for water supply 10 Pipe 20 Heat insulation material 200, 21, 22, 23, 24, 25, 26 Heat insulation sheet 211,221,231,241,251,261 Gap of abutting part 20a Inner layer 20b Outer layer 30 Resin film (bag shape) Resin member)
35 Opening portion 40 Metal tube 45 Seam portion 50 Suction device 51, 52 Split tubular body 511, 521 Flange portion of split tubular body 60 Fastening member (bolt, nut)

Claims (15)

Piping,
A heat insulating material provided on the outer peripheral side of the pipe;
A metal pipe provided on the outer peripheral side of the heat insulating material,
The heat insulating pipe for water supply, wherein the heat insulating material is a sheet-like heat insulating material that is disposed between layers of a resin film, and an inner layer and an outer layer of the heat insulating material are covered with the resin film.   The water supply heat insulation pipe according to claim 1, wherein the resin film is a bag-like resin member and is maintained at a predetermined pressure equal to or lower than atmospheric pressure. The heat insulating material is
3. The heat-insulating piping for water supply according to claim 1, comprising at least one of ceramic fiber, biosoluble fiber, rock wool, glass wool impregnated with silica airgel, and glass wool. The heat insulating material is
Rock wool, glass wool impregnated with silica airgel, and at least one of glass wool, a first heat insulating layer disposed on the pipe side,
A second heat insulating layer in which at least one of ceramic fiber and biosoluble fiber is disposed on the metal tube side;
The heat-insulating piping for water supply according to any one of claims 1 to 3, wherein: The heat insulating material is
The heat insulation layer which consists of at least 1 sort (s) of a polystyrene foam, a hard urethane foam, a phenol foam, and a foamed plastic heat insulating material is provided in the side nearest to the said piping. Insulated piping for water supply. The resin film is
6. A resin film comprising at least one thermoplastic resin of polyethylene, polypropylene, polyethylene terephthalate, polystyrene, polyvinyl chloride and polyamide, or a film obtained by laminating an aluminum foil on the resin film. The heat insulation piping for water supply as described in any one of these.   The pipe is a polyethylene pipe or a polyethylene pipe having a reinforcing band formed by winding at least one of steel strip, polyarylate fiber and aramid fiber around the polyethylene pipe. The heat insulation piping for water supply as described in any one of 6. The metal tube is
It is a spiral duct steel pipe or a seamless steel pipe, The heat insulation piping for water supply as described in any one of Claims 1-7 characterized by the above-mentioned. A first step of preparing a tubular member in which a bag-like resin member charged with a heat insulating material in a compressed state is wound around a pipe;
A second step of inserting the cylindrical member into the metal tube;
A third step of releasing the heat insulating material charged in the bag-shaped resin member from the compressed state after the second step and filling the heat insulating material between the pipe and the metal tube;
The construction method of the heat insulation piping for water supply characterized by having. The first step includes
Reducing the pressure of the bag-shaped resin member into which the heat insulating material is inserted and compressing the heat insulating material;
After compressing the heat insulating material, wrapping the bag-shaped resin member around the pipe, and preparing the tubular member;
The construction method of the heat insulation piping for water supply of Claim 9 characterized by the above-mentioned. The first step includes
Winding the bag-shaped resin member charged with the heat insulating material around the pipe;
After winding the bag-shaped resin member around the pipe, depressurizing the bag-shaped resin member and compressing the heat insulating material to prepare the cylindrical member;
The construction method of the heat insulation piping for water supply of Claim 9 characterized by the above-mentioned.   In the said 1st process, the said heat insulating material is compressed by crushing the said bag-shaped resin member from the outside, The construction method of the heat insulation piping for water supply as described in any one of Claims 9-11 characterized by the above-mentioned. In the first step, after the pressure of the bag-shaped resin member is reduced, the compressed heat insulating material is sealed by closing the opening of the bag-shaped resin member,
In the third step, by opening the opening of the bag-shaped resin member, the sealed state of the bag-shaped resin member is opened, and the heat insulating material is filled between the pipe and the metal tube. The construction method of the heat insulation piping for water supply as described in any one of Claims 9-12 characterized by these. In the first step, the bag-shaped resin member is degassed while being deaerated, and the pressure-reducing state of the bag-shaped resin member is maintained, thereby compressing the heat insulating material in the thickness direction,
In the third step, the degassing from the opening of the bag-shaped resin member is stopped, and air is introduced from the opening, so that the interior of the bag-shaped resin member is at a predetermined atmospheric pressure or less than atmospheric pressure. The pressure is restored to the pressure, the compressed heat insulating material is expanded in the thickness direction, and the density of the heat insulating material is made higher than the density of the heat insulating material before decompression. The construction method of the heat insulation piping for water supply as described in any one of Claims. A first step of preparing a tubular member in which a bag-shaped resin member sealed with a heat insulating material in a compressed state is wound around a pipe;
A second step of inserting the cylindrical member into the metal tube;
After completion of the second step, a third heat-insulating material is filled between the pipe and the metal pipe by utilizing the gas permeability of the bag-like resin member while the bag-like resin member is in a sealed state. Process,
The construction method of the heat insulation piping for water supply characterized by having.

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