JP5820169B2 - Insulated tube and method for manufacturing the same - Google Patents

Description

  The present invention relates to a tube with a heat insulating material for preventing freezing of tap water in a water pipe in a cold region and a method for manufacturing the same.

  In general, water pipes are buried in the ground, but when crossing rivers, they are laid on the ground as bridge bridge pipes. In this case, there is a risk that the tap water in the water pipe will freeze in a cold region. In order to prevent such freezing of tap water, after laying a water pipe along the bridge, cover the outer peripheral surface of the water pipe with a heat insulating material such as rock wool, and wrap a metal racking material on the outside Bridge bridge pipes are constructed by bundling with bands.

  Since the construction of such bridge pierced pipes has the problem that the construction conditions such as scaffolding are bad and the construction time becomes long, the pipe with the heat insulating material made of the main pipe, the heat insulating material and the metal racking material in advance in the factory. Manufactured and installed on the construction site as a bridge bridge pipe by bringing a pipe with a heat insulating material. For example, as shown in Patent Document 1, a pipe with a heat insulating material manufactured by injecting polyurethane foam into a gap between a high-density polyethylene pipe and a steel pipe formed by winding a flat steel plate and welding a butt portion is proposed. Has been.

Japanese Patent Laid-Open No. 11-201381

  By the way, in the above-mentioned tube with a heat insulating material, the heat insulating material, the steel pipe in contact with the heat insulating material, and the reinforcing layer are integrated by a heat generating action at the time of injecting the foam material. When trying to recycle the pipe waste material, it is difficult to separate each material, and there is a problem that the cost is high for recycling.

  Olefin resins such as polyethylene resin and polypropylene resin are nonpolar polymers and are difficult to adhere, and therefore can be separated.

  In addition, when connecting a tube with a heat insulating material, in order to join via an electric fusion joint, the steel tube and the foam layer at the end of the tube must be peeled off, and the work at the site becomes complicated, There was also a problem that it took time and effort.

  This invention is made | formed in view of such a problem, and provides the pipe | tube with a heat insulating material which can separate and recycle a waste material easily, and its manufacturing method.

The tube with a heat insulating material of the present invention has a set thickness of a straight pipe main tube made of resin and an inner diameter corresponding to the outer diameter of the main tube, at least divided into two and mounted on the outer peripheral surface of the main tube consists of a heat insulating material, a resin sheathing tube fitted on an outer peripheral surface of the heat insulating material has an inner diameter corresponding to the outer diameter of the heat insulator, the inner periphery of the outer peripheral surface and the outer tube of the heat insulating material It is characterized in that at least a part of the surface is in surface contact.

  According to the present invention, the heat insulating material is divided into two parts corresponding to the diameter, or divided into three or more pieces and attached to the main pipe, and the outer tube is inserted into the heat insulating material. This makes it possible to easily separate the waste material of the tube with the heat insulating material generated at the time of construction or removal, and to recycle it without cost.

  Here, if the inner diameter of the outer tube is the same as the outer diameter of the heat insulating material, the outer peripheral surface of the heat insulating material and the inner peripheral surface of the outer tube are at least partially in surface contact due to their low roundness. The frictional resistance can prevent the outer tube from moving in the axial direction with respect to the heat insulating material. Note that the friction resistance can be overcome by press-fitting the outer tube into the heat insulating material.

  In the present invention, the main pipe is a polyethylene pipe for water distribution, the heat insulating material is a foamed material such as expanded polystyrene, expanded polyethylene, and expanded urethane having a larger elastic modulus than rock wool, and the outer tube is a carbon black pigment. It is preferable that the bending strength of the main tube is greater than or equal to the bending strength of the outer tube, and the bending strength of the outer tube is larger than the bending strength of the heat insulating material. As a result, when the polyethylene pipe for water distribution is laid on the ground like a bridge installation pipe, it is possible to reliably prevent freezing of tap water and improve weather resistance. In addition, when a large external force is applied to the pipe with heat insulation material due to an earthquake or tsunami, the pipe with heat insulation material is bent and deformed according to the bending strength of the polyethylene pipe for water distribution, and the strength of the outer pipe is that of the polyethylene pipe for water distribution. It does not affect the bending deformation.

  In the present invention, it is preferable that each end portion of the main pipe protrudes from each pipe end surface of the heat insulating material and the outer pipe by a length corresponding to half or more of the clamp length when the electrodes are electrofused. Thereby, when connecting a pipe | tube with a heat insulating material through an electric fusion joint, the end edge part of a main pipe can be faced | matched via a clamp, and it can fix reliably from fusion to cooling solidification.

In the present invention, the mobile Gath-loop in the axial direction of the outer tube with respect to the thermal insulation material, or, is preferably prevented through the resistance means such as an O-ring. Thereby, even if a gap is generated between the outer peripheral surface of the heat insulating material and the inner peripheral surface of the outer tube due to a manufacturing error, the axial movement of the outer tube relative to the heat insulating material can be prevented via the resistance means.

  In the present invention, caps having flanges are respectively inserted into the main pipes, and movement of the caps in the axial direction relative to the main pipes is prevented via an O-ring provided on the inner peripheral surface of the caps, and the ribs are kept warm. It is preferable that the heat retaining material and the outer tube are prevented from moving in the axial direction by being abutted against the edge portions of the material and the outer tube. Thereby, the movement of the heat insulating material and the outer tube in the axial direction can be prevented by the flange of the cap fitted into the main pipe. In addition, foreign matter can be prevented from entering the main pipe.

  The method for producing a tube with a heat insulating material according to the present invention includes attaching a heat insulating material having an inner diameter corresponding to the outer diameter of the main tube to the outer peripheral surface of a resin-made straight tubular main tube, and then maintaining the heat insulating material. A resin-made outer tube having an inner diameter corresponding to the outer diameter of the heat insulating material is fitted into the outer peripheral surface of the material.

  According to the present invention, the heat insulating material that is divided into two or three or more according to the diameter is attached to the outer peripheral surface of the resin straight tubular main pipe, and then the outer peripheral surface of the heat insulating material is attached. By inserting the outer tube, the tube with the heat insulating material can be easily manufactured. In addition, even if waste pipes with insulation material are generated during construction or removal, the insulation material can be separated from the main pipe, and the exterior tube can be separated from the insulation material, which can be recycled without cost. It becomes possible.

  Here, if the inner diameter of the outer tube is the same as the outer diameter of the heat insulating material, the outer peripheral surface of the heat insulating material and the inner peripheral surface of the outer tube are at least partially in surface contact due to their low roundness. The frictional resistance can prevent the outer tube from moving in the axial direction with respect to the heat insulating material. Note that the friction resistance can be overcome by press-fitting the outer tube into the heat insulating material.

  The method for producing a tube with a heat insulating material according to the present invention includes attaching a heat insulating material having an inner diameter corresponding to the outer diameter of the main tube to the outer peripheral surface of a resin-made straight tubular main tube, and then maintaining the heat insulating material. A resin-made outer tube having an inner diameter less than the outer diameter of the material is heated, expanded to an inner diameter equal to or larger than the outer diameter of the heat insulating material, and fitted into the outer peripheral surface of the heat insulating material.

  According to the present invention, the heat insulating material divided into two or three or more according to the diameter is attached to the outer peripheral surface of the resin straight tubular main pipe, and then less than the outer diameter of the heat insulating material. The outer tube having the inner diameter is heated, expanded to an inner diameter equal to or larger than the outer diameter of the heat insulating material, and fitted into the outer peripheral surface of the heat insulating material, whereby the tube with the heat insulating material can be easily manufactured. In addition, even if waste pipes with insulation material are generated during construction or removal, the insulation material can be separated from the main pipe, and the exterior tube can be separated from the insulation material, which can be recycled without cost. It becomes possible. In addition, the cooled outer tube is in an interference fit state as the heat insulating material, and the axial movement of the outer tube relative to the heat insulating material can be reliably prevented.

  According to the present invention, waste materials can be easily separated and recycled.

It is a half sectional view showing one embodiment of a tube with a heat insulating material of the present invention. It is a perspective view explaining the manufacturing process of the pipe | tube with a heat insulating material of FIG. It is a perspective view explaining the manufacturing process of the pipe | tube with a heat insulating material of FIG. 1 following FIG. It is a partial half cross-sectional view showing a reference example of resistance means to prevent movement of the outer tube with respect to thermal insulation of the coercive thermosensitive material with tubes. It is a partial half sectional view which shows the other example of the resistance means which prevents the movement of an armored tube with respect to the heat insulating material of the tube with a heat insulating material of the present invention. It is a partial half sectional view which shows another example of the resistance means which prevents the movement of an exterior tube with respect to the heat insulating material of the tube with a heat insulating material of the present invention. FIG. 2 is a half cross-sectional view showing a connection structure of the heat insulating material-attached tube of FIG. It is a side view explaining the connection process of the pipe | tube with a heat insulating material of FIG. It is a side view explaining the connection process of the pipe | tube with a heat insulating material of FIG. 1 following FIG. It is a side view explaining the connection process of the pipe | tube with a heat insulating material of FIG. 1 following FIG. It is a side view explaining the connection process of the pipe | tube with a heat insulating material of FIG. 1 following FIG. It is a half sectional view showing a pipe joint with a heat insulating material. It is a side view explaining the manufacturing process of the pipe joint with a heat insulating material of FIG. It is sectional drawing which shows the other example of the pipe joint with a heat insulating material. It is a perspective view explaining the manufacturing process of the pipe joint with a heat insulating material of FIG. It is a top view of the sheet-like horizontal part and sheet-like vertical part which expand | deploy and show the tubular horizontal part and tubular vertical part of the exterior pipe | tube which comprise the pipe joint with a heat insulating material of FIG. FIG. 16 is a perspective view illustrating a manufacturing process of the pipe joint with a heat insulating material in FIG. 14 following FIG. 15. It is a perspective view explaining the other manufacturing process of the pipe joint with a heat insulating material of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows an embodiment of a tube 1 with a heat insulating material of the present invention.

  This heat insulating material pipe 1 has a main pipe 2 which is a polyethylene pipe for water distribution, an inner diameter corresponding to the outer diameter of the main pipe 2 and a thickness necessary for preventing freezing of tap water flowing through the main pipe 2. On the outer peripheral surface of the heat insulating material 3 having an inner diameter corresponding to the outer diameter of the heat insulating material 3 and the heat insulating material 3 such as expanded polystyrene, which is divided in half with the outer diameter and attached to the outer peripheral surface of the main pipe 2 It is comprised from the exterior pipe | tube 4 which is the polyethylene pipe inserted.

  And the pipe | tube 1 with a heat insulating material is the main pipe 2 in which the length of the main pipe 2 is longer than the length of the heat insulating material 3 and the exterior pipe | tube 4 so that it may respond | correspond to joining by the electric fusion joint 5 (refer FIG. 8) mentioned later. Is set so as to protrude from each end face of the heat insulating material 3 and the outer tube 4 by a length corresponding to half or more of the length required to fix the tube by the clamp.

  Also, when an excessive force is applied to the joint due to an earthquake or tsunami, the main tube 2 is prevented from being damaged, that is, the bending strength of the outer tube 4 or the heat insulating material 3 is affected by bending deformation of the main tube 2. The bending strength of the main pipe 2 ≧ the bending strength of the outer tube 4> the bending strength of the heat insulating material 3 is set so as not to affect.

  Here, the inner diameter of the outer tube 4 is set to be the same as the outer diameter of the heat insulating material 3. That is, the roundness of resin pipes such as polyethylene pipes is lower than that of machinery, and although the “dimensional tolerance and fit” defined in JIS B0401 cannot be applied as they are, the heat insulating material 3 at the time of transportation, etc. In order to prevent the outer tube 4 from moving in the axial direction, it is necessary to maintain a certain fitting relationship. For example, if the inner diameter of the outer tube 4 is the same with the outer diameter of the heat insulating material 3 as a reference, the outer tube 4 can be inserted into the foam heat insulating material 3 from the axial direction. In this case, since the roundness of the resin tube is low, at least a part of the outer peripheral surface of the heat insulating material 3 and the inner peripheral surface of the outer tube 4 are in surface contact, and friction resistance is generated when the outer tube 4 is inserted. However, in combination with the rigidity of the heat insulating material 3 being lower than the rigidity of the outer tube 4, the friction resistance can be overcome by press-fitting the outer tube 4. The axial movement of the outer tube 4 can be prevented by the frictional resistance between the heat insulating material 3 and the outer tube 4.

  In addition, the polyethylene pipe for water supply water distribution which is the main pipe 2 is prescribed | regulated to Japan Water Works Association standard JWWAK144. The expanded polystyrene as the heat insulating material 3 is a commercially available product, and is not limited to expanded polystyrene but may be expanded polyethylene or expanded polyurethane. Furthermore, the polyethylene pipe which is the exterior pipe 4 is formed black with a carbon black pigment in order to improve weather resistance.

  In order to manufacture such a tube 1 with a heat insulating material, the extruded main tube 2 is cut into a set length, and then the heat insulating materials 3A and 3A which are divided in half are attached to the outer peripheral surface of the main tube 2 ( (See FIG. 2), and temporarily fix it using an adhesive tape or the like so as not to be detached. Next, after the extruded outer tube 4 is cut to a set length, the main tube 2 and the heat insulating material 3 attached to the main tube 2 are supported, and the temporary fixing is removed, and the outer tube 4 is installed from the axial direction. What is necessary is just to insert the pipe | tube 4 in the outer peripheral surface of the heat insulating material 3 (refer FIG. 3).

  In this case, a gap occurs between the outer peripheral surface of the heat insulating material 3 and the inner peripheral surface of the outer tube 4 due to manufacturing errors, and the outer tube 4 may move in the axial direction from the heat insulating material 3 during transportation. In some cases, resistance means may be provided between the heat insulating material 3 and the outer tube 4 to prevent the outer tube 4 from moving.

As a reference example, there is a method of preventing the movement of the outer tube 4 by screwing a screw b toward at least one end portion of the outer tube 4 toward the heat insulating material 3 (see FIG. 4). Further, a tape (not shown) may be wound around the outer peripheral surface of the edge of the heat insulating material 3 to increase the frictional resistance against the outer tube 4 and prevent the outer tube 4 from moving.

  Furthermore, while forming a fixed gap between the outer peripheral surface of the heat insulating material 3 and the inner peripheral surface of the outer tube 4, a mounting groove is formed on each inner peripheral surface of the heat insulating material 3, and each mounting groove An O-ring s may be provided to prevent the heat insulating material 3 from moving in the axial direction relative to the main pipe 2 and to prevent the outer tube 4 from moving in the axial direction relative to the heat insulating material 3 (FIG. 5). reference).

  In this case, in order to prevent the frictional resistance due to the O-ring s from acting continuously during insertion of the outer tube 4 and hindering smooth insertion of the outer tube 4, first, as viewed from the insertion direction of the outer tube 4. The outer tube 4 is inserted and inserted in the state where the O-ring s is disposed only at the end edge of the heat insulating material 3 on the far side, and after the end of the heat insulating material 3 is still inserted, the outer tube 4 is inserted. If the O-ring s is disposed at the edge of the heat insulating material 3 on the direction side and then the outer tube 4 is pulled back, the length of the frictional resistance due to the O-ring s can be minimized, The outer tube 4 can be easily inserted.

  Further, caps c having collars c1 are respectively inserted into the respective ends of the main pipe 2, and the ribs c1 of the cap c are abutted against the respective end faces of the heat insulating material 3 and the outer tube 4, so that the shafts of the heat insulating material 3 and the outer tube 4 are provided. While preventing the movement in the heart direction, it is also possible to prevent foreign matter from entering the main pipe 2. In this case, an O-ring s is provided on the inner peripheral surface of the cap c to prevent the cap c from moving in the axial direction relative to the main pipe 2 (see FIG. 6).

  As another manufacturing method of the tube 1 with the heat insulating material, the outer diameter of the outer tube 4 is formed to be smaller than the outer diameter of the heat insulating material 3 while the outer diameter of the heat insulating material 3 is heated by heating the outer tube 4. The diameter may be increased to the above inner diameter, and may be inserted into the outer peripheral surface of the heat insulating material 3. When the outer tube 4 is cooled, the inner diameter thereof is reduced to be less than the outer diameter of the heat insulating material 3, so that the outer tube 4 is in an intimately fitted state with respect to the heat insulating material 3 and the outer tube 4 moves in the axial direction. Can be reliably prevented.

  In the above-described embodiment, the case where the heat insulating material 3 attached to the main pipe 2 is divided into two parts is illustrated. However, when the outer diameter of the main pipe 2 is large, the heat insulating material 3 is divided into three or more pieces. May be. Thereby, manufacture becomes easy corresponding to the large outer diameter of the main pipe 2. In this case, it is not necessary to equally divide in the circumferential direction, and the division angle may be determined together with the number of divisions in consideration of the construction procedure and the like.

  On the other hand, the tube 10 with a heat insulating material having a unit length configured as described above can be sequentially connected to obtain the tube 10 with a heat insulating material having a required length (see FIG. 7). Hereinafter, the point which connects the pipe | tube 1 with a heat insulating material is demonstrated.

  First, the tube 1 with a heat insulating material is arranged along the axial direction, and the end edges are opposed to each other. Next, a conventionally known electrofusion joint 5 is disposed over the end edge of the main pipe 2 of the adjacent heat-insulating pipe 1, and the electrofusion joint 5 is energized with the end face of the main pipe 2 butted, The electric fusion joint 5 and each main pipe 2 are fused and joined together (see FIG. 8).

  In this case, since the outer peripheral surface of the main pipe 2 is exposed to the outside of the electric fusion joint 5 for a set length, the main pipes 2 can be cooled and solidified from each other via a clamp (not shown). It can be fixed firmly.

  If the main pipe 2 of the adjacent pipe 1 with the heat insulating material is joined, the clamp is removed and the terminal portion of the electric fusion joint 5 is deleted (see FIG. 9), and each end face of the electric fusion joint 5 and the heat insulation are then removed. It has a width between the end surfaces of the heat insulating material 3 and the outer tube 4 of the tube 1 with the material, and has an inner diameter corresponding to the outer diameter of the main tube 2 and an outer diameter corresponding to the outer diameter of the tube 1 with the heat insulating material. A first heat insulating material 6 made of foamed polyurethane, foamed polystyrene or the like is attached to the outer peripheral surface of each main pipe 2 (see FIG. 10) and temporarily fixed with an adhesive tape or the like. Similarly, it has a width corresponding to the width of the electric fusion joint 5 and has an inner diameter corresponding to the outer diameter of the electric fusion joint 5 and an outer diameter corresponding to the outer diameter of the tube 1 with the heat insulating material. The second heat insulating material 7 made of expanded polyurethane, expanded polystyrene or the like is attached to the electrofusion joint 5 (see FIG. 11), and temporarily fixed with an adhesive tape or the like.

  If the first heat insulating material 6 and the second heat insulating material 7 are attached to the main pipe 2 and the electric fusion joint 5 of the adjacent heat insulating material pipe 1, respectively, the edge of the outer tube 4 of the adjacent heat insulating material pipe 1 After winding the protective cover 8 having a width over the entire area, covering the first heat insulating material 6 and the second heat insulating material 7 together with the edge of the outer tube 4 of the tube 1 with the heat insulating material, the overlapping portion of the protective cover 8 is Seal with waterproof tape (not shown). Further, after fixing band 9 is wound around each end edge of protective cover 8 to fix protective cover 8 to exterior tube 4 of each heat insulating material tube 1, each edge portion of protective cover 8 and each heat insulating material tube A waterproof tape (not shown) is attached to the overlapping portion of the outer tube 4 with the outer peripheral surface of each outer tube 4 to seal each end edge of the protective cover 8 against the outer tube 4 of each heat insulating tube 1. (See FIG. 7).

  Hereinafter, the tube 10 with a heat insulating material having a set length can be obtained by repeating such connection work.

  Furthermore, it is also possible to connect such a straight tubular heat insulating material pipe 1 by changing the axial direction through a heat insulating material pipe joint. Hereinafter, the elbow-shaped pipe joint with a heat insulating material 21 that connects the heat insulating material pipe 1 with the angle changed, for example, by 45 degrees will be described with reference to FIG.

  This elbow-shaped heat insulating material pipe joint 21 is provided on a main pipe 22 made of 45 ° bend, a heat insulating material 23 such as foamed polyurethane mounted on the outer peripheral surface of the main pipe 22, and an outer peripheral surface of the heat insulating material 23. And an elbow-shaped outer tube 24.

  Here, the main pipe 22 includes an arc portion whose axis is changed by 45 degrees and a straight pipe portion continuous to each end of the arc portion, and the heat insulating material 23 and the outer tube 24 are at least the arc portion of the main pipe 22. Is covered. The length of the straight pipe portion of the main pipe 22 protruding from each end face of the heat insulating material 23 and the outer pipe 24 corresponds to the joining by the electrofusion joint 5 and is half the length required for fixing by the clamp. It is set above.

  In order to manufacture such an elbow-shaped heat-insulating pipe joint 21, a commercially available 45-degree bend made of polyethylene pipe for water distribution is prepared as the main pipe 22, and the heat-insulating material 23 necessary for keeping the 45-degree bend is prepared. The polyethylene pipe having an inner diameter having a gap corresponding to the thickness is cut and joined to produce an elbow-shaped outer tube 24. Specifically, as shown in FIG. 13, the end face of a polyethylene pipe having a required inner diameter is cut so as to have an inclined face inclined by 11.25 degrees with respect to the axis, and the unit outer pipes 241 and 242 are connected to each other. The elbow-shaped outer tube 24 is formed by inserting through the main tube 22, butting the inclined surfaces with each other and butt-bonding. Next, after the main pipe 22 and the outer pipe 24 are supported concentrically, foamed polyurethane is injected into the gap between them and foamed to form the heat insulating material 23.

  In this case, it is preferable to wrap a covering material such as paper or a heat-resistant resin film around the outer peripheral surface of the main pipe 22. As a result, it is possible to reliably prevent the heat insulating material 23 such as expanded polystyrene injected into the main pipe 22 from sticking, so that the heat insulating material 23 can be easily separated from the main pipe 22 and recycled in the future. .

  If the elbow-shaped heat insulating material pipe joint 21 is manufactured in this way, after joining the straight tubular heat insulating material pipe 1 and the electric fusion joint 5, as described above, the heat insulating material pipe 1. The main pipe 2 and the main pipe 22 of the pipe joint 21 with a heat insulating material may be covered with the first heat insulating material 6 and the second heat insulating material 7, and the protective cover 8 may be wound and fixed.

  Moreover, as a pipe joint with a heat insulating material, it is not limited to an elbow, For example, a cheese shape may be sufficient.

  Specifically, as shown in FIG. 14, the cheese-like heat insulating pipe joint 31 is a cheese made of polyethylene pipe for water distribution, that is, the T-shaped main pipe 32 and the outer peripheral surface shape of the main pipe 32. The outer peripheral surface of the main pipe 32 is divided in half by having an outer peripheral surface shape having a thickness necessary to prevent freezing of tap water flowing through the T-shaped main pipe 32. A T-shaped heat insulating material 33 made of expanded polystyrene or the like attached to the surface and an inner peripheral surface shape corresponding to the outer peripheral surface shape of the horizontal portion 331 of the heat insulating material 33 and attached to the horizontal portion 331 of the heat insulating material 33 Polyethylene T comprising a tubular vertical portion 342 formed in an inner peripheral surface shape corresponding to the outer peripheral surface shape of the tubular horizontal portion 341 and the vertical portion 332 of the heat insulating material 33 and mounted on the vertical portion 332 of the heat insulating material 33. It comprises a letter-shaped outer tube 34.

  Here, the main pipe 32 protrudes from each end face of the heat insulating material 33 and the outer pipe 34 by a length that is more than half of the length required for fixing by the clamp, corresponding to the joining by the electrofusion joint 5. .

  In order to manufacture such a cheese-shaped pipe joint 31 with a heat insulating material, a commercially available polyethylene pipe cheese is prepared as a T-shaped main pipe 32, and an inner peripheral face corresponding to the outer peripheral face shape of the main pipe 32. A heat insulating material 33A, 33A having a shape and an outer peripheral surface shape with a thickness necessary for keeping the main pipe 32 warm is attached to the T-shaped main pipe 32 (see FIG. 15). Temporarily fix with adhesive tape.

  On the other hand, a T-shaped outer tube 34 is formed from a polyethylene sheet corresponding to the outer peripheral surface shape of the T-shaped heat insulating material 33. Specifically, the sheet-like horizontal portion 341A is cut out from the polyethylene sheet according to the development view based on the outer peripheral shape of the horizontal portion 331 of the T-shaped heat insulating material 33, and the development view based on the outer peripheral surface shape of the vertical portion 332 Accordingly, the sheet-like vertical portion 342A is cut out from the polyethylene sheet (see FIG. 16).

  Next, as shown in FIG. 17, the sheet-like horizontal portion 341 </ b> A is curved along the outer peripheral surface of the horizontal portion 331 of the heat insulating material 33, and the butted portion is fused to form a tubular horizontal portion 341. Similarly, the sheet-like vertical portion 342A is curved along the outer peripheral surface of the vertical portion 332 of the heat insulating material 33, and the butted portion is fused to form the tubular vertical portion 342. And if the butt | matching part (intersection line part) of the tubular horizontal part 341 and the tubular vertical part 342 is welded and the T-shaped armored tube 34 is formed, the cheese-like pipe joint 31 with a heat insulating material can be manufactured. .

  In addition, as shown in FIG. 18, the sheet-like horizontal portion 341A is curved around the horizontal portion of the T-shaped main pipe 32, and the butted portion is fused to form a tubular horizontal portion 341. The vertical portion 342A is curved around the vertical portion of the T-shaped main pipe 32, and the butted portions are fused to form the tubular vertical portion 342, and the butted portions of the tubular horizontal portion 341 and the tubular vertical portion 342 are welded. After forming the T-shaped outer tube 34, foamed polystyrene or the like is injected into the gap between the T-shaped main tube 32 and the T-shaped outer tube 34 to form foam, and the heat insulating material 33 is formed. A pipe joint 31 with a heat insulating material can be manufactured.

  If the cheese-like heat-insulating pipe joint 31 manufactured in this way is manufactured, after joining the straight tubular heat-insulating pipe 1 and the electric fusion joint 5, as described above, the heat insulating material. The main pipe 2 of the auxiliary pipe 1 and the main pipe 32 of the pipe joint 31 with the heat insulating material may be covered with the first heat insulating material 6 and the second heat insulating material 7, and the protective cover 8 may be wound and fixed.

1 Tube with heat insulating material 2 Main pipe (polyethylene pipe for water distribution)
3 Thermal insulation material 4 Exterior tube (polyethylene tube)
5 Electric fusion joint

Claims (5)

And mains straight tube made of resin,
A heat insulating material having a set thickness, which is divided into at least two parts having an inner diameter corresponding to the outer diameter of the main pipe, and is attached to the outer peripheral surface of the main pipe;
And a jacket tube made of resin fitted to the outer peripheral surface of the heat insulating material has an inner diameter corresponding to the outer diameter of the insulation material,
At least a portion of the outer peripheral surface and the inner peripheral surface of the outer tube of insulation material are in surface contact, the frictional resistance of the outer tube tape or O-ring on the outer circumferential surface of the heat insulating material is arranged with respect to the thermal insulation material is increased, the thermal insulation material with tubes, wherein Rukoto movement in the axial direction of the outer tube is prevented through the tape or O-ring. In the tube with a heat insulating material according to claim 1,
Each end of the main pipe protrudes from each pipe end surface of the heat insulating material and the outer pipe by a length corresponding to more than half of the clamp length when the electric fusion is performed,
A cap having a collar is fitted into the end of the main pipe, and movement of the cap in the axial direction relative to the main pipe is prevented via an O-ring provided on the inner peripheral surface of the cap, and the collar is a heat insulating material. And a tube with a heat insulating material, wherein the heat insulating material and the outer tube are prevented from moving in the axial direction by being abutted against the edge of the outer tube. In the tube with a heat insulating material according to claim 1 or 2,
The main pipe is a polyethylene pipe for water distribution, the heat insulating material is a foamed material such as foamed polystyrene, foamed polyethylene, foamed urethane or the like having a larger elastic modulus than rock wool, and the outer tube is a black material containing a carbon black pigment. A pipe with a heat insulating material, wherein the main pipe has a bending strength equal to or higher than the bending strength of the outer tube, and the bending strength of the outer tube is larger than the bending strength of the heat insulating material. It is a manufacturing method of the pipe with a heat insulating material as described in any one of Claims 1-3,
On the outer peripheral surface of the straight pipe main pipe made of resin, a heat insulating material having an inner diameter corresponding to the outer diameter of the main pipe is attached and divided into at least two parts,
After wrapping tape around the outer surface of the heat insulating material or installing an O-ring in the mounting groove provided in the heat insulating material,
Method for producing a heat insulating material-tube exterior tube made of a resin having an inner diameter corresponding to the outer diameter of the heat insulating material, characterized Rukoto modules inserted fitted to the outer peripheral surface of the heat insulating material. It is a manufacturing method of the pipe with a heat insulating material as described in any one of Claims 1-3,
On the outer peripheral surface of the straight pipe main pipe made of resin, a heat insulating material having an inner diameter corresponding to the outer diameter of the main pipe is attached and divided into at least two parts,
After heating the resin-made outer tube having an inner diameter less than the outer diameter of the heat insulating material, and expanding the outer tube to an inner diameter larger than the outer diameter of the heat insulating material,
Wherein the outer tube fitted on an outer peripheral surface of the heat insulating material, method of manufacturing heat insulating material-tube, characterized in Rukoto reduced in diameter to the inner diameter of less than the outer diameter of the insulation material by cooling the該Gaiso tube.

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