JP4814824B2 - Enclosure of transport pipe and method of attaching enclosure - Google Patents

Description

  The present invention surrounds the entire outer peripheral surface of the transport pipe, blocks heat transfer between the transport pipe and the gas around the transport pipe, and moves water from the radially outer side of the transport pipe to the vicinity of the outer peripheral surface of the transport pipe. The present invention relates to an enclosure for a transport pipe to be prevented and a method for mounting the enclosure.

  A transport pipe for transporting a cryogenic fluid such as liquefied natural gas is provided with a heat insulating material around it in order to keep the cryogenic fluid cool. When the temperature of the surface portion of the heat insulating material falls below the dew point, water droplets adhere to the surface of the heat insulating material. When water droplets penetrate into the heat insulating material, the heat insulating performance of the heat insulating material decreases. When water that has penetrated into the heat insulating material freezes, the volume of the water increases due to freezing, which may damage the heat insulating material. Moreover, when water adheres to the outer peripheral surface of the transport pipe, the transport pipe may be easily corroded. For this reason, it is necessary to prevent penetration of water into the heat insulating material attached to the transport pipe.

  FIG. 19 is a perspective view of the pipe cover 1 shown by cutting a part of the pipe cover 1 according to the first prior art. The pipe cover 1 includes a heat insulating material 4 attached to the pipe 3 via the inner surface material 2 and a covering material 5 attached from the outside in the radial direction of the pipe 3 of the heat insulating material 4. The member has a shape cut by a plane including a cylindrical axis, and is a semi-cylindrical shape. FIG. 20 is a cross-sectional view of the covering material 5 according to the first prior art. The covering material 5 is formed by laminating the neutral paper 6, the polyethylene film 7, the aluminum foil 8, and the polyester film 9 in this order from the side facing the pipe 3 (see, for example, Patent Document 1).

  FIG. 21 is a side view showing the heat insulating material 10 and the moisture permeation preventing sheet 11 according to the second prior art. The heat insulating material 10 is attached around the pipe 3. The moisture permeation preventing sheet 11 includes a butyl rubber sheet or an aluminum foil, and is wound around and attached to the outside of the heat insulating material 10. The moisture permeation preventing sheet 11 prevents water from penetrating into the heat insulating material 10 from the outside of the heat insulating material 10.

Japanese Patent Laid-Open No. 2001-12589

  In the first prior art shown in FIGS. 19 to 20, since a plurality of semi-cylindrical heat insulating materials and the covering material 5 are attached to the pipe 3, joints are formed between the covering materials 5, and the outside is passed through the joints. Water may penetrate. Also in the second prior art, joints are formed at the joints between the moisture permeation preventing sheets 11 on the outer peripheral surface of the heat insulating material, and external water may penetrate through the joints. In addition, the work of winding the moisture permeation preventing sheet 11 on the outer peripheral surface of the heat insulating material is a work with lower work efficiency as the pipe 3 is longer and the work space around the pipe 3 is narrower. Requires personnel and work time.

  The object of the present invention is to surround the entire outer periphery of the transport pipe, block heat transfer between the transport pipe and the gas around the transport pipe, and prevent water from radially outward of the transport pipe to the vicinity of the outer peripheral surface of the transport pipe. An object of the present invention is to provide an envelope of a transport pipe that prevents movement, and a method of attaching the envelope that easily attaches the envelope to the entire outer periphery of the transport pipe.

The present invention surrounds the entire outer peripheral surface of the transport pipe from the radially outer side of the transport pipe, and insulates the heat transfer between the transport pipe and the gas around the transport pipe;
A plurality of waterproof bodies that are in close contact with the heat insulator from the outside in the radial direction of the transport pipe than the heat insulator and surround the heat insulator,
Each waterproof body
A heat-shrinkable sheet that is disposed radially outward of the transport pipe rather than the heat insulator, and whose surface area is reduced by heat shrinkage due to temperature rise;
Each having an adhesive layer that prevents the penetration of water and adheres each of the heat-shrinkable sheets and the heat insulator;
Each adhesive layer is an enclosure of a transport pipe characterized by being integrated.

Further, the present invention is a heat insulator arrangement step of surrounding the transport pipe from the outside in the radial direction by a heat insulator that is a part of the enclosure,
A waterproof body that is a part of an enclosure, and has a heat-shrinkable sheet whose surface area is reduced by heat shrinkage due to temperature rise, and an adhesive layer that prevents water penetration in a solidified state and is laminated on the heat-shrinkable sheet. An enveloping step in which an adhesive layer is disposed on the inner side by the waterproof body to surround the heat insulator from the outside in the radial direction;
A heat shrinking step of heating the waterproof body and heat shrinking the heat shrinkable sheet sequentially from one axial end to the other axial end;
A method of mounting an enclosure comprising: repeating a surrounding step and a heat shrinking step, and a step of integrating adjacent adhesive layers of waterproof bodies in the heat shrinking step by the self-adhesive force of the adhesive layer. is there.

Further, according to the present invention, the waterproof body includes a rectangular sheet-shaped waterproof body and two engaging portions that are provided at or near two parallel sides of the waterproof body and are engaged with each other. And
The surrounding step includes a winding step of winding the waterproof body so as to surround the heat insulator from the outside in a sheet-like state in which the engagement of the engaging portion is released, and each of the wound waterproof body And an engaging stage for engaging the engaging portions with each other.

In the present invention, the waterproof body is cylindrical.
The enclosing step is an arrangement stage in which the waterproofing body is folded in the axial direction, and the transport pipe surrounded by the insulating body is passed through the waterproofing body together with the insulating body,
And a deployment stage in which the waterproof body through which the transport pipe is penetrated is developed in the axial direction.

In the present invention, the waterproof body is cylindrical.
In the enclosing step, at least a part of the other waterproofing body in the axial direction is accommodated in one waterproofing body, and a plurality of waterproofing bodies superimposed in the radial direction penetrate the transport pipe surrounded by the insulating body together with the insulating body. The placement stage
A superimposing cancellation step of canceling the superimposing of the superimposed waterproof bodies and arranging them in the longitudinal direction of the transport pipe.

  According to the present invention, since the enclosure includes the heat insulator and the plurality of waterproof bodies, the heat insulator can be fixed in close contact with the outer peripheral surface of the transport pipe by the plurality of waterproof bodies. In addition, each waterproof body is configured to include a heat-shrinkable sheet, so that the waterproof body is heated from the outside in the radial direction of the transport pipe and the temperature is increased, so that the air between the waterproof body and the heat insulating body is increased. While removing, the heat insulator can be pressed against the transport pipe to ensure the close contact between the heat insulator and the transport pipe.

  Each waterproof body is configured to include an adhesive layer. Adhesive layers of adjacent waterproof bodies are integrally formed by the self-adhesive force of the adhesive layer, and are formed in an annular shape with respect to the axis of the transport pipe. Thereby, it is possible to prevent water from penetrating into the heat insulator from the outside in the radial direction of the transport pipe. Accordingly, it is possible to prevent the heat insulation efficiency of the heat insulating material from being lowered and to block the heat transfer between the transport pipe and the gas around the transport pipe. Moreover, deterioration of a heat insulating body can be suppressed and it can prevent that water contacts the outer surface of a transport pipe. As a result, the transport pipe can be prevented from being corroded.

  Moreover, according to this invention, the mounting method of the enclosure is comprised including the heat insulating body arrangement | positioning process. Thereby, the heat insulating material which interrupts | blocks the heat transfer between the gas around a transport pipe and a transport pipe can be arrange | positioned in the radial direction outer side of a transport pipe. The method for attaching the enclosure includes an enclosure step. In the surrounding step, the heat insulating body around the transport pipe is surrounded by a waterproof body having a heat shrinkable sheet and an adhesive layer. The heat-shrinkable sheet has the property of heat-shrinking when heated to raise the temperature, and since the surface area is wider than after heat-shrinking before heat-shrinking, the waterproof body makes it easy to insulate the insulation around the transport pipe Can be surrounded.

  Moreover, the mounting method of an enclosure is comprised including a heat contraction process. In the heat shrinking step, the waterproof body is heated, the waterproof body is heated, and the heat shrink sheet is sequentially heat-shrinked by the temperature rise from one axial end to the other axial end. The heat insulating body can be pressed against the transport pipe while removing the air between the two, and the close contact between the heat insulating body and the transport pipe can be ensured.

  In addition, the method for attaching the enclosure includes a repetition process, and in the repetition process, the adhesive layers of the waterproof bodies adjacent to each other in the heat shrinking process are integrated by the self-adhesive force of the adhesive layer while repeating the surrounding process and the heat shrinking process. Make it. Accordingly, it is possible to prevent water from penetrating into the heat insulating body from the outside in the radial direction of the transport pipe through between the adhesive layers of the adjacent waterproof bodies. Accordingly, it is possible to prevent the heat insulation efficiency of the heat insulating material from being lowered and to block the heat transfer between the transport pipe and the gas around the transport pipe. Moreover, deterioration of a heat insulating body can be suppressed and it can prevent that water adheres to the outer surface of a transport pipe. As a result, the transport pipe can be prevented from being corroded.

  According to the invention, the surrounding process includes a winding stage and an engaging stage, and in the engaging stage, the engaging portions of the waterproof body wound in the winding stage are engaged with each other. . Thereby, in a state where the waterproof body surrounds the heat insulating body from the outside in the radial direction of the transport pipe, a state where the waterproof body is supported by the transport pipe and the heat insulating body can be formed. This eliminates the need to support the waterproof body from the outside in order to support the waterproof body around the heat insulating body. Therefore, the working efficiency of the surrounding process can be increased compared to a method that does not include an engagement stage.

  Also, in the method of mounting the waterproof body that is rectangular in the expanded state, if the engagement stage is not included, the longer the transport pipe, the more it is necessary to repeat the enclosing process and the heat shrinking process, In the method of mounting the enclosure including the engagement stage, it becomes easy to arrange a large number of waterproof bodies around the transport pipe in the surrounding process prior to the heat shrinking process, so the number of times the surrounding process and the heat shrinking process are repeated. Can be reduced. As a result, many waterproof bodies can be continuously heated in the heat shrinking process, so that the efficiency of the work of mounting the enclosure can be increased compared to a method that does not include an engagement stage. .

  Moreover, according to this invention, an enclosing process includes an arrangement | positioning stage and makes the transport pipe enclosed with the heat insulating body penetrate with the heat insulating body with respect to the folded waterproof body. Since the waterproof body is in a state of being folded in the axial direction, the length of the waterproof body in the axial direction is shorter than that in the state in which the waterproof body is expanded. Therefore, it becomes easier to dispose the waterproof body radially outward of the transport pipe than when the waterproof body is disposed radially outward of the transport pipe with the waterproof body deployed. In addition, many waterproof bodies can be arranged in a region of a certain length extending in the axial direction of the transport pipe.

  According to the invention, the surrounding step includes an arrangement step, and in the arrangement step, the waterproof body is arranged on the outer side in the radial direction of the transport pipe in a state where the waterproof body is superimposed. Since the waterproof body is in a superimposed state, the length of the plurality of waterproof bodies extending in the axial direction of the transport pipe is shorter than the state in which the overlap of the plurality of waterproof bodies is released. Therefore, it becomes easier to dispose the plurality of waterproof bodies radially outward of the transport pipe than when the plurality of waterproof bodies are disposed radially outward of the transport pipe without being superimposed. In addition, many waterproof bodies can be arranged in a region of a certain length extending in the axial direction of the transport pipe. Thereby, it is possible to increase the work efficiency when the waterproof body is arranged radially outward of the transport pipe in the superimposing cancellation stage.

  FIG. 1 is a perspective view showing a transport pipe 20 and an enclosure 21 in the first embodiment of the present invention. FIG. 2 is a cross-sectional view showing the enclosure 21 according to the first embodiment of the present invention by cutting along a plane perpendicular to the axial direction X of the transport pipe 20. The enclosure 21 according to the first embodiment of the present invention surrounds the transport pipe 20 from the radially outer side of the transport pipe 20, blocks heat transfer between the transport pipe 20 and the gas around the transport pipe 20, and the transport pipe. It is a material that prevents the movement of water from the radially outer side of 20 to the vicinity of the radially outer peripheral surface of the transport pipe 20. In a part of the transport pipe 20, a straight line that is perpendicular to the axial direction X of the transport pipe 20 and passes through the axis L 1 of the transport pipe 20 is referred to as “radial direction” in the part of the transport pipe 20. This name applies even when the transport pipe 20 is not cylindrical, for example, when the transport pipe 20 is formed of a square pipe. In addition, the external space near the outer peripheral surface radially outward may be referred to as “periphery”.

  The envelope body 21 includes a heat insulator 22 and a plurality of waterproof bodies 23, and each waterproof body 23 includes a heat shrink sheet 24, an adhesive layer 26, and an engaging portion 27. . The remaining part of the waterproof body 23 excluding the engaging portion 27 is referred to as a “waterproof body”, and the waterproof body 28 and the engaging portion 27 are referred to as “waterproof body”. In the first embodiment, the engaging portion 27 is a fastener 29. In the present invention, a reduction in the area of the surface perpendicular to the thickness direction of the sheet-like member is referred to as “heat shrinkage”, and a sheet that thermally shrinks due to a temperature rise is referred to as a “heat shrink sheet”. A flexible, thin and flat member is referred to as a “sheet”, which also includes a film. The engaging part 27 is a part that engages a part of the heat shrinkable sheet 24 with another part of the same heat shrinkable sheet 24.

  The heat insulator 22 in the first embodiment is included in the envelope body 21, surrounds the entire outer peripheral surface of the transport pipe 20 from the outside in the radial direction, and blocks heat transfer between the transport pipe 20 and the gas around the transport pipe 20. . Each waterproof body 23 includes a heat-shrinkable sheet 24, an adhesive layer 26, and an engaging portion 27, and is disposed radially outward from the heat insulator 22. The heat-shrink sheet 24 is disposed radially outward from the heat insulator 22 via the adhesive layer 26, and the adhesive layer 26 prevents water penetration and bonds the heat-shrink sheet 24 and the heat insulator 22. Adhesive layers 26 of adjacent waterproof bodies 23 are integrally formed by the self-adhesive force of the adhesive layer 26, and are formed in an annular shape with respect to the axis of the transport pipe 20.

  In the first embodiment, the waterproof body 28 is a rectangular sheet-like material. One side in the thickness direction of the waterproof body 28 is a heat shrink sheet 24, and the other side in the thickness direction of the waterproof body 28 is an adhesive layer 26. The adhesive layer 26 is laminated on the heat shrinkable sheet 24 and is fixed to the heat shrinkable sheet 24. The waterproof body 23 is mounted with the adhesive layer 26 facing inward in the radial direction and the heat shrinkable sheet 24 facing outward in the radial direction. In a state where the waterproof body 23 is attached, the adhesive layer 26 bonds the heat shrinkable sheet 24 and the heat insulating body 22. The engaging portions 27 are provided at or near two parallel sides of the waterproof body 28 and are engaged with each other.

In the first embodiment, the transport pipe 20 is a cylindrical transport pipe 20 that transports the cryogenic liquid 31. Specifically, in the first embodiment, the cryogenic liquid 31 is liquefied natural gas (
Liquefied Natural Gas, abbreviation: “LNG”). The outer diameter of the transport pipe 20 varies depending on the site of the transport pipe 20 and is often 5 mm or more and 1 m or less. LNG having a temperature set to −162 ° C. passes through the internal space formed in the transport pipe 20.

  A heat insulator 22 is installed outside the transport pipe 20 in the radial direction. The heat insulating body 22 includes a plurality of heat insulating materials 32, is formed of foamed plastic, and has flexibility. The heat insulator 22 has a semi-cylindrical shape obtained by cutting a cylindrical member along a plane including the axis of the cylinder. Two heat insulating materials 32 are arranged at the same position in the axial direction X of the transport pipe 20, the two heat insulating materials 32 are located on the opposite side with respect to the transport pipe 20, and the two heat insulating materials 32 are used in the axial direction of the transport pipe 20. A part of X is surrounded from the outside in the radial direction over the entire circumference. In a state where the two heat insulating materials 32 surround a part of the transport pipe 20, the outer shape of the cross section obtained by cutting the heat insulating material 32 along a plane perpendicular to the axial direction X is a circular shape. This is referred to as “heat insulation outer peripheral length”. In other words, the outer peripheral length of the heat insulating material 32 is the outer peripheral length of the heat insulating material 32 around the axis of the transport pipe 20 on the radially outer surface of the heat insulating material 32. The heat insulating material 32 is disposed in close contact with the transport pipe 20. Corresponding to a plurality of types of transport pipes 20 due to the difference in thickness, a plurality of types of heat insulating materials 32 are prepared depending on the size.

  FIG. 3 is a partial cross-sectional view showing the submarine underground tunnel 33 in which the transport pipe 20 is installed and the transport pipe 20 in the first embodiment of the present invention. 4 is a cross-sectional view illustrating the submarine underground tunnel 33 and the transport pipe 20 in the submarine underground tunnel 33 cut along a plane perpendicular to the axial direction X of the transport pipe 20 in the first embodiment of the present invention. It is. In the first embodiment, the transport pipe 20 is disposed in the submarine underground tunnel 33. The submarine underground tunnel is a tunnel provided in the basement of the seabed to arrange the transport pipe. The internal space formed in the submarine underground tunnel 33 is a space with a height of several meters and is formed over a total length of 1 km or more.

  The temperature in the tunnel is higher than −162 ° C. The transport pipe 20 in the tunnel is longer than the tunnel and is formed over a total length of 1 km or more. The transport pipe 20 is supported by pillars every few hundred meters, and the pillars 34 are fixed to the bottom or side wall forming the tunnel. The heat insulator 22 surrounds the transport pipe 20 from the outside in the radial direction over the entire length of the transport pipe 20. Of the outer peripheral surface portion of the transport pipe 20, the heat insulating material 32 is not provided in a portion that contacts the support column 34.

  Although the heat insulator 22 and the waterproof body 23 may be installed while the transport pipe 20 is installed, in the first embodiment, the heat insulator 22 and the waterproof body 23 are installed after the transport pipe 20 is installed. The contact surfaces of the adjacent heat insulating materials 32 are joined by an adhesive. Since the heat insulating material 32 is foamed plastic, a plurality of communication, independent, or both spaces are formed inside the heat insulating material 32, and if water droplets adhere to the surface of the heat insulating material 32, the heat insulating material 32 has a heat insulating material 32. Water may penetrate. If water penetrates into the heat insulating material 32, the heat insulating effect of the heat insulating material 32 decreases. Further, when the water that has penetrated into the heat insulating material 32 is cooled by LNG passing through the inside of the transport pipe 20, the water freezes and becomes ice. When ice is formed, since the volume of ice is larger than liquid water, the heat insulating material 32 may be damaged. The durability of the heat insulating material 32 installed by the prior art is 20 to 30 years.

  FIG. 5 is a flowchart showing the steps of the method for mounting the enclosure 21 according to the first embodiment of the present invention. The mounting method of the enclosure 21 which concerns on 1st Embodiment is comprised including a heat insulator arrangement | positioning step, an enclosing process, and a heat contraction process. After the start of this process, the process proceeds to the heat insulator arrangement stage of step a1, and the heat insulator 22 surrounds the outer peripheral surface portion of the transport pipe 20 from the outside in the radial direction. Next, the process proceeds to the enclosing step of step a2, and the heat insulating body 22 is surrounded by the waterproof body 23 from the outside in the radial direction. Next, the process proceeds to the heat shrinking step of step a3, the waterproof body 23 is heated, and the heat shrink sheet 24 is sequentially heat shrunk by the temperature rise from one end in the axial direction X to the other end in the axial direction X of the waterproof body 23. Let In this step, the adhesive layer 26 is formed in close contact with the outer surface in the radial direction of the heat insulating body 22 and is formed in an integral shape, and surrounds the entire transport pipe 20 from the outer side in the radial direction.

  Next, the process proceeds to a repetition process of step a4, and the same process as the surrounding process of step a2 and the same process as step a3 are repeated. That is, the heat insulating sheet 22 is surrounded by the waterproof body 23 from the outside in the radial direction, and then the waterproof body 23 is heated so that one end in the axial direction X of the waterproof body 23 is directed toward the other end in the axial direction X. Repeat 24 to heat-shrink sequentially. After the entire transport pipe 20 is completely surrounded by the envelope body 21 from the outside in the radial direction by the repetition process, the present process is ended.

  FIG. 6 is a flowchart showing in more detail the steps of the method for attaching the enclosure 21 according to the first embodiment of the present invention shown in FIG. In the first embodiment, the waterproof body 28 is a rectangular sheet-like material, and the enclosing process in the first embodiment includes a winding stage and an engaging stage. After the start of this process, the process proceeds to the heat insulator arrangement stage in step b1, and then proceeds to the winding stage in step b2. In the winding stage, the waterproof body 23 is radially outward of the heat insulating material 32 so that the waterproof body 23 surrounds the heat insulating body 22 from the outside in a sheet-like state in which the engagement portion 27 is disengaged. Wrap around. Next, the process proceeds to an engagement stage of step b3, and the respective engaging portions 27 of the wound waterproof body 23 are engaged with each other. Next, the process proceeds to the heat shrinking process of step b4, and then the process proceeds to the repeating process of step b5. After the entire transport pipe 20 is completely surrounded by the envelope body 21 from the outside in the radial direction by the repetition process, the present process is ended.

  The step of arranging heat insulator in step b1 is the process shown as the step of arranging heat insulator in step a1 in FIG. The winding stage of step b2 and the engaging stage of step b3 are included in the process shown as the surrounding process of step a2 in FIG. The heat shrinking process of step b4 is the process shown as the heat shrinking process of step a3 in FIG. 5, and the repeating process of step b5 is the process shown as the repeating process of step a4 in FIG.

  The enclosure 21 includes a heat insulator 22 and a plurality of waterproof bodies 23, and the waterproof body 23 adheres and fixes the heat insulator 22 to the outer peripheral surface of the transport pipe 20. Each waterproof body 23 includes a heat shrink sheet 24. When the waterproof body 23 is heated more radially outward than the waterproof body 23 and the temperature of the waterproof body 23 is increased, the waterproof body 23 presses the heat insulating body 22 against the transport pipe 20 and transports with the heat insulating body 22. Adhesion with the tube 20 is ensured.

  The waterproof body 23 includes an adhesive layer 26, and the adhesive layers 26 of the adjacent waterproof bodies 23 are integrally formed by the self-adhesive force of the adhesive layer 26, and are formed in an annular shape with respect to the axis of the transport pipe 20. As a result, the adhesive layer 26 prevents water from penetrating into the heat insulator 22 from the outside in the radial direction of the transport pipe 20, and suppresses deterioration of the heat insulator 22. Further, water is prevented from coming into contact with the outer surface of the transport pipe 20, and corrosion of the transport pipe 20 is prevented.

  The mounting method of the enclosure 21 includes a heat insulator arrangement step. Accordingly, the heat insulating material 32 that blocks the heat transfer between the transport pipe 20 and the gas around the transport pipe 20 is disposed radially outward of the transport pipe 20, and the heat insulating material 32 is disposed around the transport pipe 20 and the transport pipe 20. Block heat transfer with gas. Moreover, the mounting method of the surrounding body 21 includes an surrounding process. In the enclosing step, the heat insulating body 22 around the transport pipe 20 is surrounded by the waterproof body 23 having the heat shrinkable sheet 24 and the adhesive layer 26. The heat-shrinkable sheet 24 has a property of heat-shrinking when heated to raise the temperature, and has a wider surface area than after heat-shrinking before heat-shrinking. As a result, the waterproof body 23 is easily provided with the heat insulating material 32 radially outward of the transport pipe 20.

  Moreover, the mounting method of the enclosure 21 includes a heat shrinking process. In the heat shrinking step, the waterproof body 23 is heated, the waterproof body 23 is heated, and the heat shrink sheet 24 is sequentially heat shrunk by temperature rise from one end in the axial direction X toward the other end in the axial direction X. In the heat shrinking process, as the heat shrink sheet 24 sequentially heat shrinks, the air between the waterproof body 23 and the heat insulating body 22 is removed, and the waterproof body 23 presses the heat insulating body 22 against the transport pipe 20. The close contact between the heat insulator 22 and the transport pipe 20 is ensured.

  In addition, the method for attaching the envelope body 21 includes a repeating step. In the repeating step, the adhesive layer 26 of the waterproof body 23 adjacent to each other in the heat shrinking step is connected to the self-adhesive layer 26 while repeating the surrounding step and the heat shrinking step. Integrate by adhesive force. This prevents water from penetrating into the heat insulating body 22 from the outside in the radial direction of the transport pipe 20 through the adhesive layers 26 of the adjacent waterproof bodies 23. Thereby, the heat insulation efficiency of the heat insulating material 32 is prevented from being lowered, and the heat transfer between the transport pipe 20 and the gas around the transport pipe 20 is blocked. Moreover, deterioration of the heat insulating body 22 is suppressed and water is prevented from adhering to the outer surface of the transport pipe 20. This prevents the transport pipe 20 from being corroded.

  The surrounding process includes a winding stage and an engaging stage. In the engagement stage, the respective engaging portions 27 of the waterproof body 23 wound in the winding stage are engaged with each other. As a result, a state in which the waterproof body 23 is supported by the transport pipe 20 and the heat insulator 22 is formed in a state where the waterproof body 23 surrounds the heat insulator 22 from the outside in the radial direction of the transport pipe 20. Accordingly, since the waterproof body 23 is supported around the heat insulating body 22, it is not necessary to support the waterproof body 23 from the outside, and the working efficiency of the surrounding process is increased as compared with a method that does not include an engagement stage.

  Further, in the method of attaching the waterproof body 23 that is rectangular in the expanded state, if the engagement stage is not included, the longer the transport pipe 20 is, the more it is necessary to repeat the enclosing process and the heat shrinking process. However, in the mounting method of the enclosure 21 including the engagement stage, it becomes easy to arrange a large number of waterproof bodies 23 around the transport pipe 20 in the enclosure process prior to the heat shrink process. It is possible to reduce the number of times the process is repeated. As a result, many waterproof bodies 23 can be continuously heated in the heat shrinking process, so that the efficiency of the work of mounting the enclosure 21 is increased compared to a method that does not include an engagement stage.

  FIG. 7 is a perspective view of the waterproof body 23 showing the waterproof body 23 in the first embodiment of the present invention in a state where the engagement portion 27 is disengaged. FIG. 8 is a side view showing a state where the waterproof body 23 adjacent to the mounted waterproof body 23 is wound around the transport pipe 20 after the waterproof body 23 according to the first embodiment of the present invention is mounted. FIG. 9 is a cross-sectional view of the enclosure 20 according to the first embodiment of the present invention taken along the cutting plane line AA shown in FIG. FIG. 10 is a cross-sectional view of the enclosure 20 according to the first embodiment of the present invention cut along the cutting plane line BB shown in FIG.

  A waterproof body 23 is provided outside the heat insulating body 22 in the radial direction. In the first embodiment, the waterproof body 28 is a rectangular sheet-like material. One side in the thickness direction of the waterproof body 28 is a heat shrink sheet 24, and the other side in the thickness direction of the waterproof body 28 is an adhesive layer 26. The adhesive layer 26 is laminated on the heat shrinkable sheet 24 and is fixed to the heat shrinkable sheet 24. A part 29a of the fastener is formed at one end portion 36 forming one side of the waterproof body 28 along the side. Another portion 29b of the fastener is formed in one thickness direction near the other end 37 forming another side parallel to this side, parallel to the other side of the waterproof body 28. The other end 29b of the waterproof body 28 and the other part 29b of the fastener are parallel to each other, and the distance d1 between the end surface 37a of the other end of the waterproof body and the other part 29b of the fastener is determined before the heat shrinking process. In the state, it is 2 cm or more and 3 cm or less. In a state after the enclosing step, the fastener portion 29a engages with the other portion 29b of the fastener.

  In a state prior to the enclosing step, the waterproof body main body 28 is attached to the waterproof body 23 from a part of the fastener 29 to the other part of the fastener 29 in a state where the engagement of the fastener 29 is released. It is longer than the outer peripheral length of the heat insulating material 32 of the partial heat insulating body 22. In a state where the waterproof body 23 is wound around the heat insulator 22 in the surrounding process, the waterproof body 28 in the region between the other end portion 37 of the waterproof body and the other portion 29b of the fastener is the waterproof body. It overlaps with the vicinity of the one end 36. The waterproofing body 23 surrounds the heat insulating material 32 by engaging a part of the fastener 29 and the other part of the fastener 29 in a state where the portions overlap. In a state where the fastener 29 is closed and a portion overlapping the waterproof body main body 28 is formed, the overlapping portion is referred to as an “approximate portion overlapping portion”. The engaging portion vicinity overlapping portion 38a in the vicinity of the one end portion 36 of the waterproof body is overlapped with the other end portion 38b of the waterproof body in the radial direction.

  In the state after the heat shrinking step, as shown in FIG. 2, the heat shrink sheets 24 that overlap each other in the radial direction at the overlapping portion 38 in the vicinity of the engaging portion are bonded by the adhesive layer 26. In the state before the heat shrinking step, the adhesive layer 26 is laminated and fixed to the heat shrinkable sheet 24, but the surface of the other adhesive layer 26 in the thickness direction of the waterproof body 23 has no adhesive force. When the waterproof body 23 is heated in the heat shrinking process and the temperature of the waterproof body 23 rises, the surface area of the surface perpendicular to the thickness direction of the heat shrink sheet 24 decreases, and the adhesive layer 26 melts and becomes semi-solid, semi-liquid. It becomes a paste. The material in which the adhesive layer 26 becomes pasty due to temperature rise is referred to as “adhesive”. The adhesive has adhesive strength.

  When the waterproof body 23 is heated and the temperature rises in a state where the adhesive layer 26 is in contact with the radially outer surface of the heat insulating material 32, the adhesive layer 26 becomes an adhesive and the radially outer side of the heat insulating material 32. And the surface of the heat shrinkable sheet 24 in the radial direction. When the heat-shrinkable sheet 24 is heat-shrinked due to an increase in temperature, the surface area perpendicular to the thickness direction of the adhesive decreases with the heat-shrinkable sheet 24. As a result of the heat shrinking process, the heat shrinkable sheet 24 has a maximum length of a quarter compared to the state before the heat shrinking process, and thus the surface area of the surface perpendicular to the thickness direction is a maximum of 16 minutes. It becomes 1 of.

  In the heat shrinking process, the adhesive layer 26 in contact with the radially outer surface of the heat insulating material 32 melts, and the length of the heat shrink sheet 24 in the circumferential direction of the transport pipe 20 and the heat shrink sheet 24 in the axial direction X The length is shortened. As a result, the adhesive becomes longer in the circumferential direction and the axial direction X than the heat shrinkable sheet 24. Therefore, in the overlapping portion 38 near the engaging portion, the radially inner adhesive and the radially outer adhesive come into contact with each other and are integrated with each other.

  In the heat shrinking process, the waterproof body 23 is heated and thermally contracted sequentially from one axial direction to the other axial direction, and therefore, between the adhesive layer 26 of the waterproof body 23 and the heat shrink sheet 24 of the adjacent waterproof body 23, and The air layer between the adhesive layer 26 at the one end 36 of the waterproof body and the adhesive layer 26 at the other end 37 of the waterproof body is removed. The engaging portion 27 of the waterproof body 23 that has undergone the heat shrinking process and the engaging portion 27 of the waterproof body 23 adjacent thereto are positioned at different positions in the circumferential direction. As a result, the overlapping portion 38 near the engaging portion and the overlapping portion 39 in the axial direction are prevented from overlapping in the radial direction.

  FIG. 11 is a perspective view showing the transport pipe 20 and the waterproof body 23 in the middle of the heat shrinking process in the first embodiment of the present invention. FIG. 12 is a cross-sectional view of the transport pipe 20 and the waterproof body 23 in a state in the middle of the heat shrinking process cut along a plane including the axis L1 of the transport pipe 20 in the first embodiment of the present invention. 11 and 12, the engaging portion is omitted. The waterproof body contracts in the circumferential direction and the axial direction by heat shrinkage. The heat shrinkage was performed from one axial direction to the other axial direction, and the direction of the other axial direction was indicated by an arrow Y in FIGS. Therefore, the radius of the waterproof body before heat shrinkage is different from the radius of the waterproof body after heat shrinkage, and the difference d3 is about 50 mm.

  Prior to the heat shrinking process, the waterproof body 21 is disposed further radially outward of the heat insulating body 22 disposed radially outward of the transport pipe 20, and between the heat insulating body 22 and the waterproof body 21, It is preferable to form and arrange a fixed interval over the entire circumference.

  The smaller this difference d3, the more difficult the work when engaging the waterproof body. However, since the fastener does not heat shrink even when heated, the greater the heat shrinkage of the waterproof body, the more stress is generated in the waterproof body in the vicinity of the fastener after the heat shrinkage, and the difference d3 is the above-mentioned degree. It is preferable. Further, the heat-shrinkable sheet is more preferably a material that has a change in length in the circumferential direction due to heat shrinkage greater than a change in length in the axial direction due to heat shrinkage and is anisotropic with respect to heat shrinkage.

  As shown in FIG. 4, the mounting method of the envelope body 21 according to the first embodiment of the present invention includes a heat insulator placement stage, an enveloping process winding stage, an enclosing process engaging stage, and a heat shrinking process. And a repeating process. After the start of this process, the process proceeds to the heat insulator placement stage of step b1, and the heat insulator 22 surrounds the outer peripheral surface portion of the transport pipe 20 from the outside in the radial direction. Next, the process proceeds to the winding stage of step b2, and the waterproof body 23 is insulated from the heat insulating material 32 so that the waterproof body 23 surrounds the heat insulating body 22 from the outside in a sheet-like state in which the fasteners 29 are disengaged. Wrap around the outside in the radial direction. Next, the process proceeds to the engagement stage of step b3, and each waterproof body 23 is disposed radially outward of the heat insulating material 32 by closing each fastener 29 of the wound waterproof body 23. In the first embodiment, the fasteners 29 are formed to extend in the axial direction X. Therefore, the fasteners 29 are engaged along the axial direction X in the engaging stage. The direction in which the fastener 29 is closed may be either of the two directions in the axial direction X.

  Next, the process proceeds to the heat shrinking step of step b4, the waterproof body 23 is heated, and the heat shrink sheet 24 is sequentially heat shrunk by the temperature rise from one end in the axial direction X to the other end in the axial direction X of the waterproof body 23. Let In this step, the adhesive layer 26 is melted by the temperature rise and becomes an adhesive. The adhesive is longer in the circumferential direction and the axial direction X than the heat shrinkable sheet 24. As a result, the radially inner adhesive and the radially outer adhesive come into contact with each other in the overlapping portion 38 near the engaging portion and are integrated with each other. Therefore, the adhesive is formed in an annular shape so as to surround the transport pipe 20 from the entire circumferential direction. When the temperature becomes lower than the melting temperature of the adhesive layer 26 from this state, the adhesive is solidified to become the adhesive layer 26. Water does not penetrate into the adhesive layer 26, and the adhesive layer 26 prevents water from penetrating from the outside in the radial direction into the heat insulating layer. Further, seawater containing salt does not penetrate into the adhesive layer 26, and the adhesive layer 26 also prevents the penetration of seawater from the outside in the radial direction into the heat insulating layer.

  Next, the process proceeds to a repetition process of step b5, and the same operations as those in the winding stage in step b2, the engagement stage in step b3, and the heat shrinking process in step b4 are repeated. In the repetition process, the waterproof body 23 wound around the outer side in the radial direction of the heat insulating material 32 is wound around the heat shrinkable sheet 24 heated and heat-shrinked immediately before at a position adjacent to the axial direction X. At this time, the waterproof body 23 is wound around the heat-shrinkable sheet 24 that has been heated and heat-shrinked immediately before so as to partially overlap in the axial direction X. The length d2 in the axial direction X of the heat shrinkable sheet 24 that has been heat-shrinked immediately before and the waterproof body 23 to be wound is preferably 2 cm or more and 3 cm or less in the axial direction X. This overlapping in the axial direction X is referred to as “axially overlapping portion”.

  When the waterproof body 23 is heated immediately before, the adhesive layer 26 melts and becomes an adhesive with the heat shrinkage of the heat shrinkable sheet 24, so that the adhesive is against the radially outer surface of the heat insulating material 32. The heat-shrinkable sheet 24 is heat-shrinked in the adhered state. Thereby, in the axial direction overlapping portion 39, the adhesive layer 26 or the adhesive is exposed radially outward from the heat-shrinkable heat-shrink sheet 24. Therefore, in the repeating step, the waterproof layer 23 is wound around the axially overlapping portion 39, whereby the adhesive layer 26 of the wound waterproof body 23 and the exposed adhesive layer 26 or adhesive are brought into contact with each other.

  In the repetition process, the fastener 29 of the waterproof body 23 wound is closed and the waterproof body 23 is heated. As a result, the adhesive layers 26 of the waterproof bodies 23 adjacent in the axial direction X are integrated. This prevents water from passing from the outside in the radial direction to the inside through the boundary between the ends of the adjacent waterproof bodies 23. After heat-shrinking the heat-shrinkable sheet 24 by heating the wound waterproofing body 23, the heat-shrinkable sheet 32 of the waterproofing body 23 is adjacent to the heat-shrinkable sheet 24 subjected to the heat-shrinking in the axial direction X. Wrap around.

  In the repetition process, by repeating operations similar to the winding stage of step b2, the engagement stage of step b3, and the heat shrinking process of step b4, the transport pipe 20 and the heat insulator 22 radially outward of the transport pipe 20 Are sequentially surrounded by the waterproof body 23 from one axial direction X to the other axial direction X. The transport pipe 20 is surrounded by the heat insulating body 22 and the waterproof body 23 over the entire length in the axial direction X by the surrounding process including the winding stage of step b2 and the engaging stage of step b3, the heat shrinking process, and the repeating process. Is done.

  According to the first embodiment, the envelope body 21 includes the heat insulator 22 and a plurality of waterproof bodies 23, so that the heat insulator 22 is fixed in close contact with the outer peripheral surface of the transport pipe 20 by the plurality of waterproof bodies 23. be able to. Moreover, since each waterproof body 23 is comprised including the heat-shrink sheet | seat 24, the waterproof body 23 is heated from the radial direction outer side, and the temperature between the waterproof body 23 and the heat insulating body 22 is raised. While excluding air, the heat insulator 22 can be pressed against the transport pipe 20 to ensure the close contact between the heat insulator 22 and the transport pipe 20.

  Each waterproof body 23 includes an adhesive layer 26, and the adhesive layers 26 of adjacent waterproof bodies 23 are integrally formed by the self-adhesive force of the adhesive layer 26, and are annular with respect to the axis of the transport pipe 20. It is formed. Thereby, it is possible to prevent water from penetrating the heat insulator 22 from the outside in the radial direction. Therefore, the heat insulation efficiency of the heat insulating material 32 can be prevented from being lowered, and the heat transfer between the transport pipe 20 and the gas around the transport pipe 20 can be blocked. Moreover, deterioration of the heat insulator 22 can be suppressed, and water can be prevented from coming into contact with the outer surface of the transport pipe 20. As a result, the transport pipe 20 can be prevented from being corroded.

  Moreover, according to 1st Embodiment, the mounting method of the enclosure 21 is comprised including the heat insulation body arrangement | positioning step. Thereby, the heat insulating material 32 which interrupts | blocks the heat transfer between the gas around the transport pipe 20 and the transport pipe 20 can be arrange | positioned radially outward. Moreover, the mounting method of the surrounding body 21 is comprised including the surrounding process. In the enclosing step, the heat insulating body 22 around the transport pipe 20 is surrounded by the waterproof body 23 having the heat shrinkable sheet 24 and the adhesive layer 26. The heat-shrinkable sheet 24 has the property of heat-shrinking when heated to raise the temperature, and the surface area is larger than that after heat-shrinking before heat-shrinking. 32 can be easily surrounded.

  Moreover, the mounting method of the enclosure 21 is comprised including a heat contraction process. In the heat shrinking step, the waterproof body 23 is heated, the waterproof body 23 is heated, and the heat shrink sheet 24 is sequentially heat shrunk by the temperature rise from one end of the axial direction X toward the other end of the axial direction X. While excluding the air between the waterproof body 23 and the heat insulator 22, the heat insulator 22 can be pressed against the transport pipe 20 to ensure the close contact between the heat insulator 22 and the transport pipe 20.

  In addition, the method for attaching the envelope body 21 includes a repeating step. In the repeating step, the adhesive layer 26 of the waterproof body 23 adjacent to each other in the heat shrinking step is connected to the self-adhesive layer 26 while repeating the surrounding step and the heat shrinking step. Integrate by adhesive force. Accordingly, it is possible to prevent water from penetrating into the heat insulating body 22 from the outside in the radial direction through between the adhesive layers 26 of the adjacent waterproof bodies 23. Therefore, the heat insulation efficiency of the heat insulating material 32 can be prevented from being lowered, and the heat transfer between the transport pipe 20 and the gas around the transport pipe 20 can be blocked. Moreover, deterioration of the heat insulator 22 can be suppressed, and water can be prevented from adhering to the outer surface of the transport pipe 20. As a result, the transport pipe 20 can be prevented from being corroded.

  Further, according to the first embodiment, the surrounding process includes a winding stage and an engaging stage, and in the engaging stage, each engaging portion 27 of the waterproof body 23 wound in the winding stage is Engage with each other. As a result, it is possible to form a state in which the waterproof body 23 is supported by the transport pipe 20 and the heat insulator 22 in a state where the waterproof body 23 surrounds the heat insulator 22 from the outside in the radial direction. This eliminates the need to support the waterproof body 23 from the outside in order to support the waterproof body 23 around the heat insulator 22. Therefore, the working efficiency of the surrounding process can be increased compared to a method that does not include an engagement stage.

  Further, in the method of attaching the waterproof body 23 that is rectangular in the expanded state, if the engagement stage is not included, the longer the transport pipe 20 is, the more it is necessary to repeat the enclosing process and the heat shrinking process. However, in the mounting method of the enclosure 21 including the engagement stage, it becomes easy to arrange a large number of waterproof bodies 23 around the transport pipe 20 in the enclosure process prior to the heat shrink process. It is possible to reduce the number of times the process is repeated. As a result, many waterproof bodies 23 can be continuously heated in the heat shrinking process, so that the efficiency of the work of mounting the enclosure 21 is increased as compared with the method not including the engagement stage. Can do.

  Moreover, since the shape of the heat insulating material 32 is a semi-cylindrical shape in the first embodiment, the heat insulating material 32 can be attached to the periphery of the transport pipe 20 from two radially outer sides sandwiching the axis of the transport pipe 20. Accordingly, the heat insulating material 32 can be disposed radially outward of the transport pipe 20 after the transport pipe 20 is attached to the city that supports the transport pipe 20. Therefore, compared to the case where the heat insulating material 32 is tape-shaped and the heat insulating material 32 is wound around the transport pipe 20 and attached, the heat insulating material 32 can be easily attached.

  Further, in the first embodiment, the waterproof body 23 is not a tubular shape but a sheet shape with the engaging portion 27 released, so the transport pipe 20 is attached to the support column 34 that supports the transport pipe 20 and the heat insulator 22 is attached. After being arranged radially outward of the transport pipe 20, the waterproof body 23 can be placed around the transport pipe 20.

  In the first embodiment, in a state before the enclosing step, in a state where the engagement portion 27 is disengaged, from a part of the engagement portion 27 to another portion engaged with a portion of the engagement portion 27. The length of the waterproof body 28 is longer than the outer peripheral length of the heat insulating material 32 of the portion of the heat insulating body 22 to which the waterproof body 23 is attached. Thereby, the circumferential length of the transport pipe 20 of the waterproof body 23 arranged around the transport pipe 20 in the surrounding process is longer than the outer peripheral length of the heat insulating material 32, and the overlapping portion 38 is formed near the engaging portion. . Accordingly, it is possible to prevent water from penetrating from the outside in the radial direction through the engaging portion 27.

  In the first embodiment, in the heat shrinking process, the adhesive layer 26 in contact with the radially outer surface of the heat insulating material 32 is melted, and the length and the axial direction X of the heat shrink sheet 24 in the circumferential direction of the transport pipe 20 are melted. The length of the heat shrinkable sheet 24 becomes shorter. As a result, the adhesive becomes longer in the circumferential direction and the axial direction X than the heat shrinkable sheet 24. Therefore, the radially inner adhesive and the radially outer adhesive can be brought into contact with each other and integrated with each other in the overlapping portion 38 near the engaging portion. Moreover, in the repetition process, the adhesive layers 26 of the adjacent waterproof bodies 23 or the adhesive layers 26 and the adhesive can be brought into contact with each other to be integrated. Accordingly, it is possible to prevent water from penetrating from the outside in the radial direction at the joint between the ends of the waterproof body 23.

  FIG. 13 is a perspective view of the waterproof body 23 used in the second embodiment of the present invention. FIG. 14 is a perspective view of the waterproof body 23 when the waterproof body 23 used in the second embodiment of the present invention is viewed from a direction different from that in FIG. 13. In the second embodiment, the waterproof body 23 is formed in a cylindrical shape and supplied in a state of being folded in the axial direction X. The folded waterproof body 23 is formed with an internal space 41 through which the transport pipe 20 surrounded by the heat insulator 22 can penetrate together with the heat insulator 22. The internal space 41 is not formed by cutting or notching the waterproof body 23, but is the same topologically as the internal space defined by the expanded tubular waterproof body 23. The tubular waterproof body 23 is formed by repeating a shape formed by folding in the axial direction X. FIG. 13 shows a waterproof body 23 that is formed into a substantially square shape when folded in the axial direction X. However, the folded waterproof body 23 is folded in the axial direction X, and the internal space 41 defined by the expanded tubular waterproof body 23 and the topologically the same internal space 41 is formed. It is sufficient if an internal space 41 is formed in which the transport pipe 20 surrounded by can be penetrated together with the heat insulator 22. For example, the waterproof body 23 folded in another embodiment may be formed in a substantially hexagonal shape when viewed in the axial direction X. In still another embodiment, the waterproof body 23 is viewed in the axial direction X. It may be formed in a substantially circular shape.

  FIG. 15 is a flowchart showing the steps of the mounting method of the enclosure 21 according to the second embodiment of the present invention. In the second embodiment, the mounting method of the enclosure 21 includes a heat insulator arrangement stage, an enclosure process, a heat shrink process, and a repetition process, and the enclosure process includes an arrangement stage and a deployment stage. Consists of. After the start of this process, the process proceeds to the heat insulator arrangement stage of step c1, and the heat insulator 22 is arranged around the transport pipe 20. Next, the process proceeds to the arrangement stage of step c2. In the arrangement stage, the folded waterproof body 23 is arranged further radially outward of the heat insulator 22 around the transport pipe 20. One or more waterproof bodies 23 may be arranged.

  Next, the process proceeds to a deployment stage of step c3, and the folded waterproof body 23 is deployed in the axial direction X. Thereby, at least a part of the heat insulator 22 and the transport pipe 20 in the axial direction X is surrounded by the waterproof body 23. Next, it transfers to the heat shrink process of step c4, and heat-shrinks the heat-shrink sheet | seat 24 by heating the waterproof body 23 from the radial direction outer side of the waterproof body 23. FIG. Next, the process proceeds to the repeating step of step c5, and the same operation as the placement stage, the same operation as the deployment stage, and the same operation as the heat shrink process are repeated.

  In the iterative process, the waterproof body 23 disposed radially outward of the heat insulating material 32 is disposed at a position adjacent to the axial direction X with respect to the heat-shrinkable sheet 24 that has been heat-shrinked immediately before and is expanded. The When unfolded, the waterproof body 23 is disposed so as to partially overlap in the axial direction X with respect to the heat-shrinkable sheet 24 that has been heated and heat-shrinked immediately before. The length d2 in the axial direction X of the overlapping in the axial direction X between the heat-shrinkable sheet 24 thermally contracted in a straight line and the newly disposed waterproof body 23 is preferably 2 cm or more and 3 cm or less. In other words, the waterproof body 23 is arranged so as to form the axially overlapping portion 39 after being deployed in the repetition process.

  When the waterproof body 23 is heated immediately before, the adhesive layer 26 melts and becomes an adhesive with the heat shrinkage of the heat shrinkable sheet 24, so that the adhesive is against the radially outer surface of the heat insulating material 32. The heat-shrinkable sheet 24 is heat-shrinked in the adhered state. Thereby, in the axial direction overlapping portion 39, the adhesive layer 26 or the adhesive is exposed radially outward from the heat-shrinkable heat-shrink sheet 24. Therefore, in the repetition process, by providing the overlapping portion 39 in the axial direction and disposing the waterproof body 23, the adhesive layer 26 of the newly disposed waterproof body 23 and the exposed adhesive layer 26 or adhesive are in contact with each other. .

  In the repetition process, after the folded waterproof body 23 is developed, the waterproof body 23 is heated. As a result, the adhesive layers 26 of the waterproof bodies 23 adjacent in the axial direction X are integrated. This prevents water from passing from the outside in the radial direction to the inside through the boundary between the ends of the adjacent waterproof bodies 23. After heat-shrinking the heat-shrinkable sheet 24 by heating the waterproof body 23 that is deployed and arranged, the heat-shrinkable sheet 24 that has been heat-shrinked is adjacent to the heat-shrinkable sheet 24 in the axial direction X to insulate the water-proof body 23. Arrangement with respect to the material 32 is performed, and the waterproof body 23 is developed. After the entire transport pipe 20 is completely surrounded by the envelope body 21 from the outside in the radial direction by the repetition process, the present process is ended.

  The insulator arrangement stage of step c1 is the same as the insulator arrangement stage of step b1 in the first embodiment. The heat shrinking process of step c4 is the same as the heat shrinking process of step b4 in the first embodiment.

  FIG. 16 is a perspective view showing a state in which the enclosure surrounds the transport pipe from the outside in the radial direction in the second embodiment of the present invention. Although the shape of the waterproof body in the folded state when viewed in the axial direction was rectangular, when the heat-shrinkable sheet heat-shrinks through the heat-shrink process, the waterproof body is positioned radially outward of the transport pipe. It is in close contact with the outer peripheral surface and has a shape that matches the shape of the transport pipe.

  According to the second embodiment, the surrounding process includes an arrangement stage, and in the arrangement stage, the transport pipe 20 surrounded by the heat insulator 22 is passed through the folded waterproof body 23 together with the heat insulator 22. Since the waterproof body 23 is in a state of being folded in the axial direction X, the length of the waterproof body 23 in the axial direction X is shorter than the state in which the waterproof body 23 is expanded. Therefore, it becomes easier to dispose the waterproof body 23 radially outward of the transport pipe 20 than when the waterproof body 23 is disposed radially outward of the transport pipe 20 with the waterproof body 23 deployed. . Further, many waterproof bodies 23 can be arranged in a region of a certain length extending in the axial direction X of the transport pipe 20.

  Further, in the second embodiment, in the heat shrinking process, the adhesive layer 26 in contact with the radially outer surface of the heat insulating material 32 is melted, and the length of the heat shrinkable sheet 24 in the axial direction X is shortened. As a result, the adhesive becomes longer in the axial direction X than the heat shrinkable sheet 24. In the repeating process, the adhesive layers 26 of the adjacent waterproof bodies 23 or the adhesive layer 26 and the adhesive are brought into contact with each other. Thereby, the adhesive layer 26 of the waterproof body 23 adjacent in the axial direction X can be integrated. Therefore, it is possible to prevent water from penetrating from the outside in the radial direction at the joint between the ends of the waterproof body 23.

  FIG. 17 is a perspective view of a plurality of waterproof bodies 23 used in the third embodiment of the present invention. In the third embodiment, the waterproof body 23 is formed in a cylindrical shape, and at least a part of the other waterproof body 23 in the axial direction X is accommodated in one waterproof body 23 and is superposed in the radial direction. 23 is supplied. The circumferential lengths of the plurality of waterproof bodies 23 to be superimposed are different from each other, and the lengths of the waterproof bodies 23 in the axial direction X are all the same. The plurality of waterproof bodies 23 superimposed in the third embodiment all have the same length in the axial direction X, and the waterproof bodies 23 accommodated in the other waterproof bodies 23 extend over the entire length in the axial direction X. Stored.

  FIG. 18 is a flowchart showing the steps of the method for mounting the enclosure 21 according to the third embodiment of the present invention. In the third embodiment, the mounting method of the enclosure 21 includes a heat insulator arrangement stage, an enclosure process, a heat shrink process, and a repetition process, and the enclosure process includes an arrangement stage and an overlap cancellation stage. Consists of including. After the start of this process, the process proceeds to the heat insulator arrangement stage of step d1, and the heat insulator 22 is arranged around the transport pipe 20. Next, the process proceeds to the arrangement stage of step d2. In the arrangement stage, the plurality of waterproof bodies 23 superimposed are arranged further radially outward of the heat insulator 22 around the transport pipe 20.

  Next, the process proceeds to the superimposing cancellation step of step d3, and at least a part of the axial direction X of the other waterproofing body 23 is accommodated in one waterproofing body 23, and the plurality of waterproofing bodies 23 superimposed in the radial direction are Arranged in the direction X, whereby at least a part of the heat insulator 22 and the transport pipe 20 in the axial direction X is surrounded by the waterproof body 23. To shorten the length in the axial direction X of the portion where the waterproof bodies 23 overlap in the radial direction by changing the relative position of the waterproof bodies 23 is referred to as “cancellation of superposition”. Next, it transfers to the heat shrink process of step d4, and heat-shrinks the heat-shrink sheet | seat 24 by heating the waterproof body 23 from the radial direction outer side of the waterproof body 23. FIG. Next, the process proceeds to a repetition process of step d5, and the same operation as the arrangement stage, the same operation as the superposition cancellation stage, and the same operation as the heat shrink process are repeated.

  In the iterative process, the waterproof body 23 disposed radially outward of the heat insulating material 32 is disposed at a position adjacent to the axial direction X with respect to the heat-shrinkable sheet 24 that has been heat-shrinked immediately before and is superimposed. Canceled. When the superposition is canceled and the waterproof body 23 is disposed radially outward of the heat insulating body 22, the waterproof body 23 is partially in the axial direction X with respect to the heat-shrinkable sheet 24 that has been heated and contracted immediately before. Arranged to overlap. The overlap in the axial direction X between the heat-shrinkable sheet 24 that is thermally shrunk in a straight line and the newly disposed waterproof body 23 is preferably 2 cm or more and 3 cm or less. In other words, the waterproof body 23 is arranged in a state where the axially overlapping portion 39 is formed after the waterproof body 23 is unfolded in the repetition process.

  When the waterproof body 23 is heated immediately before, the adhesive layer 26 melts and becomes an adhesive with the heat shrinkage of the heat shrinkable sheet 24, so that the adhesive is against the radially outer surface of the heat insulating material 32. The heat-shrinkable sheet 24 is heat-shrinked in the adhered state. Thereby, in the axial direction overlapping portion 39, the adhesive layer 26 or the adhesive is exposed radially outward from the heat-shrinkable heat-shrink sheet 24. Therefore, in the repeating process, the waterproof body 23 is disposed leaving the axially overlapped portion 39, so that the adhesive layer 26 of the newly disposed waterproof body 23 and the exposed adhesive layer 26 or adhesive are in contact with each other. .

  In the repeating step, the waterproof body 23 is heated after the superposition of the waterproof body 23 superimposed in the radial direction is canceled. As a result, the adhesive layers 26 of the waterproof bodies 23 adjacent in the axial direction X are integrated. This prevents water from passing from the outside in the radial direction to the inside through the boundary between the ends of the adjacent waterproof bodies 23. After heat-shrinking the heat-shrinkable sheet 24 by heating the waterproof body 23 that is deployed and arranged, the heat-shrinkable sheet 24 that has been heat-shrinked is adjacent to the heat-shrinkable sheet 24 in the axial direction X to insulate the water-proof body 23. Arrangement with respect to the material 32 is performed, and the waterproof body 23 is developed. After the entire transport pipe 20 is completely surrounded by the envelope body 21 from the outside in the radial direction by the repetition process, the present process is ended.

  The insulator arrangement stage of step d1 is the same as the insulator arrangement stage of step b1 in the first embodiment. The heat shrinking process of step d4 is the same as the heat shrinking process of step b4 in the first embodiment. In the third embodiment, the enclosure mounted radially outward of the transport pipe is the same as the state shown in FIG. 11 in the second embodiment.

  According to the third embodiment, the surrounding process includes an arrangement stage, and in the arrangement process, the waterproof body 23 is arranged outward in the radial direction of the transport pipe 20 in a state where the waterproof body 23 is superimposed. Since the waterproof body 23 is in a superimposed state, the length of the plurality of waterproof bodies 23 extending in the axial direction X of the transport pipe 20 is shorter than the state in which the overlap of the plurality of waterproof bodies 23 is released. Therefore, it is easier to dispose the plurality of waterproof bodies 23 radially outward of the transport pipe 20 than when the plurality of waterproof bodies 23 are disposed radially outward of the transport pipe 20 without being superimposed. Become. Further, many waterproof bodies 23 can be arranged in a region of a certain length extending in the axial direction X of the transport pipe 20. Thereby, it is possible to increase the work efficiency when the waterproof body 23 is disposed radially outward of the transport pipe 20 in the superposition cancellation stage.

  In the third embodiment, in the heat shrinking process, the adhesive layer 26 in contact with the outer surface in the radial direction of the heat insulating material 32 is melted, and the length of the heat shrinkable sheet 24 in the axial direction X is shortened. As a result, the adhesive becomes longer in the axial direction X than the heat shrinkable sheet 24. In the repeating process, the adhesive layers 26 of the adjacent waterproof bodies 23 or the adhesive layer 26 and the adhesive are brought into contact with each other. Thereby, the adhesive layer 26 of the waterproof body 23 adjacent in the axial direction X can be integrated. Accordingly, it is possible to prevent water from penetrating from the outside in the radial direction at the joint between the ends of the waterproof body 23.

  In the first to third embodiments, the transport pipe 20 is a transport pipe 20 that transports LNG. However, in the present invention, the transport pipe 20 may be a pipe that transports fluid. For example, in another embodiment, the transport pipe 20 may be a transport pipe 20 that transports Liquefied Petroleum Gas (abbreviation: “LPG”). In still another embodiment, the transport pipe 20 may be an environmental temperature. It may be a transport pipe 20 that transports a gas having a lower temperature.

  In the first to third embodiments, the transport tube 20 is a cylindrical tube, but the shape of the transport tube 20 is not defined in the present invention. For example, in other embodiments, the transport pipe 20 may be a square pipe.

  In the first to third embodiments, the heat insulating material 32 included in the heat insulating body 22 has a semi-cylindrical shape. However, in the present invention, the heat insulating material 32 is transported from the outside in the radial direction of the transport tube 20. And a material that shields the transport pipe 20 with respect to heat transfer is sufficient. For example, in another embodiment, the heat insulating material 32 may have a tape shape, or may be a material having a cylindrical shape and a portion cut in the circumferential direction.

  In the first embodiment, the engaging portion 27 is the fastener 29. However, in the present invention, the engaging portion 27 is provided at or near two parallel sides of the waterproof body 28 and is mutually connected. Part of the engaging portions 27 that are engaged and engage with each other is formed along one side of one side of the waterproof body 28 and along the other side. It is sufficient if it is formed in the vicinity of the other end portion forming another side parallel to the side and in parallel with the other side of the waterproof body 23. For example, in another embodiment, the engaging portion 27 may be formed including a button. In the first embodiment, the distance d1 between the other end portion of the waterproof body 28 and the other portion of the engaging portion 27 is set to be 2 cm or more or within 3 cm. The distance between the other end portion of the waterproof body 28 and the other portion of the engaging portion 27 may be within 2 cm, or 3 cm or more.

  In the first to third embodiments, the heat transport body 20 is surrounded by the heat insulator 22 in the heat insulator arrangement stage, and the repetition process includes an operation similar to the enveloping process and an operation similar to the heat shrinking process. However, in another embodiment, a part of the heat insulating material 32 of the heat insulating body 22 is arranged around the transport pipe 20 in the heat insulator arranging step, and the heat insulating material 32 is transported in the repetition process. An operation of disposing the tube 20 from the outside in the radial direction may be further performed.

  In the repetition process in the first embodiment, a process including an operation of winding the waterproof body 23 and an operation of engaging the engaging portion 27 of the waterproof body 23 is performed, but in the repetition process in other embodiments, A process including an operation of winding the plurality of waterproof bodies 23 and an operation of engaging the engaging portions 27 of the plurality of waterproof bodies 23 may be performed.

  In the repetition process in 2nd Embodiment, the transport pipe 20 enclosed by the heat insulating body 22 is penetrated with the heat insulating body 22 in the internal space 41 formed in the folded waterproof body 23, and the water resistant body 23 is heat-insulated. A process including an operation of disposing 22 outward in the radial direction and an operation of expanding the folded waterproof body 23 in the axial direction X is performed. This repeating process includes an operation of disposing the plurality of folded waterproof bodies 23 with respect to the transport pipe 20 connected in the axial direction X and deploying the folded waterproof bodies 23 in the axial direction X. It may be a process.

  In the repetition process in the third embodiment, an operation of arranging the plurality of waterproof bodies 23 superimposed on the outer side in the radial direction of the heat insulator 22 and an operation of arranging the plurality of waterproof bodies 23 superimposed on each other in the axial direction X. In another embodiment, in the repetitive process, a plurality of superposed waterproof bodies 23 are set as one set, and a plurality of sets of superposed waterproof bodies 23 are arranged in the axial direction X of the transport pipe 20. You may perform the process including the operation arrange | positioned around and the operation which arranges the waterproof body 23 with which several sets were superimposed in the axial direction X. FIG.

  In the first to third embodiments, the heat insulator 22 and the waterproof body 23 surround the transport pipe 20 from the outside in the radial direction. However, in other embodiments, the heat insulator 22 and the waterproof body 23 are the transport pipe 20. May be arranged so as to surround the outer peripheral portion of the column 34.

  Although the mounting method of the enclosure 21 in 2nd Embodiment is comprised including a heat insulating body arrangement | positioning step, an enclosure process, a heat contraction process, and a repetition process, in other embodiment, the mounting method of the enclosure 21 is comprised. The transport pipe is formed by folding the waterproof body 23 in the axial direction X and forming an inner space 41 that is topologically the same as the inner space defined by the expanded tubular waterproof body 23 and surrounded by the heat insulator 22. The folding process which forms the internal space 41 which 20 can penetrate with the heat insulating body 22 may be comprised further.

  In the third embodiment, the length of the waterproof body 23 in the axial direction X of the portion accommodated in the other waterproof body 23 is the same as the length of the waterproof body 23 in the axial direction X. In the form, the length of the waterproof body 23 in the axial direction X of the portion accommodated in the other waterproof body 23 may be shorter than the length of the waterproof body 23 in the axial direction X. The longer the length in the axial direction X of the portion accommodated in the other waterproof body 23 is, the shorter the superimposed waterproof bodies 23 are in the axial direction X. Although the operation of disposing the outer side in the radial direction becomes easier, the superimposed waterproof body 23 may be displaced in the axial direction X.

It is a perspective view showing the transport pipe 20 and the enclosure 21 in 1st Embodiment of this invention. FIG. 3 is a cross-sectional view illustrating the enclosure 21 according to the first embodiment of the present invention by cutting along a plane perpendicular to the axial direction X of the transport pipe 20. In 1st Embodiment of this invention, it is the fragmentary sectional view showing the submarine underground tunnel 33 in which the transport pipe 20 is installed, and the transport pipe 20. FIG. In the first embodiment of the present invention, it is a cross-sectional view illustrating the submarine underground tunnel 33 and the transport pipe 20 in the submarine underground tunnel 33 cut by a plane perpendicular to the axial direction X of the transport pipe 20. It is a flowchart showing the process of the mounting | wearing method of the enclosure 21 which concerns on 1st Embodiment of this invention. It is a flowchart showing in detail the process of the mounting method of the enclosure 21 which concerns on 1st Embodiment of this invention shown in FIG. FIG. 3 is a perspective view of the waterproof body 23 showing the waterproof body 23 in the first embodiment of the present invention in a state in which the engagement portion 27 is disengaged. It is a side view showing the state where the waterproofing body 23 adjacent to the mounted waterproofing body 23 was wound around the transport pipe 20 after mounting the waterproofing body 23 in the first embodiment of the present invention. It is sectional drawing which cut | disconnected the enclosure 20 in 1st Embodiment of this invention, and cut | disconnected by cut surface line AA shown in FIG. It is sectional drawing which saw the enclosure 20 in 1st Embodiment of this invention cut | disconnected by cut surface line BB shown in FIG. In 1st Embodiment of this invention, it is a perspective view showing the transport pipe 20 and the waterproof body 23 in the state in the middle of a heat contraction process. In 1st Embodiment of this invention, it is sectional drawing seen by cut | disconnecting the transport pipe 20 and the waterproof body 23 in the state in the middle of a heat contraction process by the plane containing the axis line L1 of the transport pipe 20. FIG. It is a perspective view of the waterproofing body 23 used in 2nd Embodiment of this invention. It is the perspective view of the waterproof body 23 which looked at the waterproof body 23 used in 2nd Embodiment of this invention from the direction different from FIG. It is a flowchart showing the process of the mounting method of the enclosure 21 which concerns on 2nd Embodiment of this invention. It is a perspective view showing the state in which the enclosure enclosed the transport pipe from the radial direction outer side in 2nd Embodiment of this invention. It is a perspective view of the some waterproofing body 23 used in 3rd Embodiment of this invention. It is a flowchart showing the process of the mounting method of the enclosure 21 which concerns on 3rd Embodiment of this invention. It is a perspective view of the pipe cover 1 which cuts and represents a part of pipe cover 1 which concerns on a 1st prior art. It is sectional drawing of the coating | covering material 5 which concerns on a 1st prior art.

It is a side view showing the heat insulating material 10 concerning the 2nd prior art, and the sheet | seat 11 for moisture permeation prevention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 20 Transport pipe 21 Enclosure 22 Heat insulation body 23 Waterproof body 24 Heat-shrink sheet 26 Adhesion layer 27 Engagement part 28 Waterproof body main body 29 Fastener 31 Low temperature liquid 32 Heat insulation material 33 Submarine underground tunnel 34 Support | pillar 38 Superposition part near engagement part 39 Axis line Direction overlap part 41 Internal space

Claims (5)

A heat insulator that surrounds the entire outer peripheral surface of the transport pipe from the radially outer side of the transport pipe and blocks heat transfer between the transport pipe and the gas around the transport pipe;
A plurality of waterproof bodies that are in close contact with the heat insulator from the outside in the radial direction of the transport pipe than the heat insulator and surround the heat insulator,
Each waterproof body
A heat-shrinkable sheet that is disposed radially outward of the transport pipe rather than the heat insulator, and whose surface area is reduced by heat shrinkage due to temperature rise;
Each having an adhesive layer that prevents the penetration of water and adheres each of the heat-shrinkable sheets and the heat insulator;
Each adhesive layer is integrated, and is a transport pipe enclosure. An insulator arrangement step of surrounding the transport pipe from the outside in the radial direction by an insulator that is part of the enclosure;
A waterproof body that is a part of an enclosure, and has a heat-shrinkable sheet whose surface area is reduced by heat shrinkage due to temperature rise, and an adhesive layer that prevents water penetration in a solidified state and is laminated on the heat-shrinkable sheet. An enveloping step in which an adhesive layer is disposed on the inner side by the waterproof body to surround the heat insulator from the outside in the radial direction;
A heat shrinking step of heating the waterproof body and heat shrinking the heat shrinkable sheet sequentially from one axial end to the other axial end;
An enclosure mounting method comprising: a repeating step of integrating adjacent adhesive layers of waterproof bodies by self-adhesive force of the adhesive layer while repeating the surrounding step and the heat shrinking step. The waterproof body has a rectangular sheet-like waterproof body, and two engaging portions that are respectively provided at or near two parallel sides of the waterproof body and are engaged with each other.
The surrounding step includes a winding step of winding the waterproof body so as to surround the heat insulator from the outside in a sheet-like state in which the engagement of the engaging portion is released, and each of the wound waterproof body The enclosure mounting method according to claim 2, further comprising an engaging stage for engaging the engaging portions with each other. The waterproof body is cylindrical,
The enclosing step is an arrangement stage in which the waterproofing body is folded in the axial direction, and the transport pipe surrounded by the insulating body is passed through the waterproofing body together with the insulating body,
The method for mounting an enclosure according to claim 2, further comprising: a deployment step of deploying the waterproof body through which the transport pipe is penetrated in an axial direction. The waterproof body is cylindrical,
In the enclosing step, at least a part of the other waterproofing body in the axial direction is accommodated in one waterproofing body, and a plurality of waterproofing bodies superimposed in the radial direction penetrate the transport pipe surrounded by the insulating body together with the insulating body. The placement stage
The method for mounting an enclosure according to claim 2, further comprising a step of releasing superposition of the superposed waterproof bodies and arranging them in the longitudinal direction of the transport pipe.

Images