JP6762545B1 - Insulation method and insulation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique capable of constructing a heat insulating material quickly, easily and at low cost. A method of constructing a heat insulating material is a resin-made covering member, which has a plurality of openings for fitting end portions of the heat insulating members for straight pipes that cover a plurality of straight pipes, and each of the openings has a plurality of openings. A process of preparing a covering member capable of accommodating an elbow joint connecting each straight pipe in the internal space in a state where the heat insulating member for straight pipe is fitted, and a step of attaching the covering member to each heat insulating member for straight pipe. The covering member includes a step of forming a communication hole for communicating the internal space of the covering member with the outside, and a step of injecting a foaming liquid from the communication hole into the internal space of the covering member. [Selection diagram] Fig. 1

Description

The present invention relates to a method for constructing a heat insulating material and a heat insulating material.

There is known a heat insulating material that covers various pipes installed in buildings and plants to insulate the pipes from the outside. Foamed plastic materials (hard urethane foam, polystyrene foam, polyethylene foam, phenol foam, etc.) are known as materials for such heat insulating materials. The heat insulating material that insulates the pipe from the outside is required to have a shape according to the pipe specifications such as the pipe diameter, the pipe shape, and the heat insulating conditions. Patent Documents 1 and 2 disclose a pipe cover member that insulates an elbow joint that connects straight pipes in a bent shape, and a heat insulating structure.

Japanese Unexamined Patent Publication No. 2003-301993 Jikkai Sho 56-84190

In the piping cover member described in Patent Document 1, it is necessary to prepare a plurality of types of piping covers in advance according to the piping specifications, and there is a problem that inventory management is troublesome and costly. In the heat insulating structure described in Patent Document 2, it is necessary to prepare and assemble a plurality of divided pieces according to the shape of the pipe, which is troublesome to construct and requires skilled workers for the construction.

The present invention has been made to solve at least a part of the above-mentioned problems, and an object of the present invention is to provide a technique capable of constructing a heat insulating material quickly, easily, and at low cost.

The present invention has been made to solve the above-mentioned problems, and can be realized as the following forms.

(1) According to one embodiment of the present invention, a method of constructing a heat insulating material is provided. The method of constructing the heat insulating material is a resin-made covering member, which has a plurality of openings for fitting the ends of the heat insulating members for straight pipes that cover the plurality of straight pipes, and each of the straight pipes has a plurality of openings. A step of preparing a covering member capable of accommodating an elbow joint connecting the straight pipes in the internal space in a state where the heat insulating member for pipes is fitted, and a step of attaching the covering member to each of the heat insulating members for straight pipes. A step of forming a communication hole for communicating the internal space of the covering member with the outside and a step of injecting a foaming liquid from the communication hole into the internal space of the covering member. ..

According to this configuration, a heat insulating material (foam) is formed around the elbow joint by injecting a foaming liquid into the internal space of the covering member containing the elbow joint and foaming the foam. For this reason, it is not necessary to prepare multiple types of piping covers in advance according to piping specifications such as piping diameter, piping shape, and heat insulation conditions, which can reduce the labor and cost of inventory management and what kind of elbow joint is used. Even if it has a shape, a heat insulating material suitable for the shape of the elbow joint can be formed. In addition, since it is not necessary to create and assemble split pieces that match the shape of the elbow joint, construction is easy, no skilled work is required for construction, and waste materials generated when cutting out split pieces from heat insulating plates, etc. Loss can be eliminated. Further, since a covering member capable of accommodating an elbow joint connecting each straight pipe in the internal space in a state where the heat insulating member for straight pipe is fitted is used, the covering member can be attached to the heat insulating member for straight pipe and the covering member can be attached. The formation of a space (internal space) for injecting the foam liquid inside can be carried out quickly and easily. Further, since this covering member can be used as it is as the exterior of the foam, deterioration of the foam can be suppressed and the aesthetic appearance can be improved. As a result, according to this configuration, it is possible to construct the heat insulating material quickly, easily, and at low cost (labor cost, inventory management cost, waste material cost).

(2) In the construction method of the above embodiment, in the step of forming the communication hole, the covering member and the straight pipe heat insulating member are superimposed on the covering member attached to each straight pipe heat insulating member. The communication hole may be formed in a part of the range that does not exist.
According to this configuration, in the step of forming the communication hole, the communication hole is formed in a part of the range where the covering member and the heat insulating member for straight pipe are not overlapped, so that the foaming liquid leaks to the heat insulating member side for straight pipe. Insulation material (foam) can be easily formed around the elbow joint.

(3) In the step of forming the communication hole in the construction method of the above embodiment, the covering member extends along the axial direction of the covering member with respect to the covering member attached to each of the straight pipe heat insulating members, and the covering member. The communication hole may be formed in a part within a range of ± 45 degrees with reference to the upper end of the virtual surface for cutting the
According to this configuration, in the step of forming the communication hole, it extends along the axial direction of the covering member and communicates with a part within a range of ± 45 degrees with reference to the upper end of the virtual surface that cuts the covering member in the vertical direction. Since the holes are formed, the foaming liquid can be spread in the internal space of the covering member by the action of gravity.

(4) In the construction method of the above embodiment, in the step of attaching the covering member, the end portion of the covering member and the outer surface of each of the straight pipe heat insulating members may be fixed with a moisture-proof tape.
According to this configuration, in the step of attaching the covering member, the end portion of the covering member and the outer surface of the heat insulating member for straight pipe are fixed with a moisture-proof tape, so that leakage of the foamed liquid to the heat insulating member side for straight pipe can be suppressed. .. In addition, the inside of the covering member can be drip-proof, and the durability of the heat insulating material after construction can be improved.

(5) In the construction method of the above embodiment, after the injection step, a step of confirming whether or not the internal space of the covering member is filled with the foam formed by the foam liquid and a step of confirming whether or not the inner space of the covering member is filled with the foam is filled. If not, the step of forming the communication hole, the step of injecting, and the step of confirming may be repeated in sequence.
According to this configuration, further, a step of confirming whether or not the internal space of the covering member is filled with the foam formed by the foaming liquid is provided, and if it is not filled, the communication hole is formed again. Since the process of injecting the foaming liquid and checking is repeated, the heat insulating material (foaming material) can be surely formed in the internal space of the covering member.

(6) In the construction method of the above embodiment, a step of sealing the communication hole may be further provided after the step of injecting.
According to this configuration, since the step of sealing the communication holes is further provided after the step of injecting, the inside of the covering member can be drip-proof, and the durability of the heat insulating material after construction can be improved.

(7) The construction method of the above embodiment further includes a step of covering each of the straight pipes with a pair of semi-cylindrical heat insulating members for straight pipes before the mounting step, and the covering step includes one step. A cross-linking member that bridges each of the straight pipe heat insulating members between one of the straight pipe heat insulating members attached to the straight pipe and the other straight pipe heat insulating member attached to the straight pipe. A cross-linked member that divides the internal space of the member may be provided.
According to this configuration, in the step of covering the straight pipe with a pair of straight pipe heat insulating members, in order to provide a cross-linking member that divides the internal space of the covering member, the heat insulating material (foam) after construction is covered with this cross-linking member. It can be easily decomposed into one and the other as a boundary. As a result, the heat insulating material can be easily removed after construction.

(8) According to one embodiment of the present invention, a heat insulating material is provided. This heat insulating material is a resin-made covering member, and has a plurality of openings for fitting the ends of the straight pipe heat insulating members that cover the plurality of straight pipes, and each of the straight pipe heat insulating members has a plurality of openings. A covering member capable of accommodating an elbow joint connecting the straight pipes in the internal space and a foam filled in the internal space of the covering member are provided in a state of being fitted.

The present invention can be realized by a method of constructing a heat insulating material and various forms other than the heat insulating material. The present invention can be realized, for example, in the form of a method of constructing a pipe including a heat insulating material, a pipe covered with a heat insulating material, or the like.

It is explanatory drawing which illustrated the construction method of the heat insulating material in 1st Embodiment. It is explanatory drawing which illustrated the piping. It is explanatory drawing which illustrated the state of the process S12. It is explanatory drawing which illustrated the state of the process S12. It is explanatory drawing which illustrated the covering member. It is explanatory drawing which illustrated the state of the process S14. It is explanatory drawing which illustrated the state of the process S16. It is explanatory drawing which illustrated the state of the process S18. It is explanatory drawing which illustrates the preferable formation range of the communication hole. It is explanatory drawing which illustrated the cross section in line AA of FIG. It is explanatory drawing which illustrated the state of the process S20. It is explanatory drawing which illustrated the state of steps S22, S24. It is explanatory drawing which illustrated the construction method of the heat insulating material in 2nd Embodiment. It is explanatory drawing which illustrated the cross section in line AA (FIG. 9) of a covering member. It is a figure explaining the construction method of the heat insulating material of 3rd Embodiment. It is a figure explaining the construction method of the heat insulating material of 4th Embodiment.

<First Embodiment>
FIG. 1 is an explanatory view illustrating the method of constructing the heat insulating material in the first embodiment. FIG. 2 is an explanatory diagram illustrating piping. FIG. 1 describes a method of applying a heat insulating material that covers various pipes installed in a building or a plant to insulate them from the outside. Here, "insulation" includes both heat retention and cold retention. The piping includes a straight pipe extending in a straight line and an elbow joint connecting the straight pipes in a bent shape.

FIG. 2 illustrates two straight pipes composed of a first straight pipe 10 and a second straight pipe 20, and an elbow joint 30 connecting the first straight pipe 10 and the second straight pipe 20. To do. The first straight pipe 10, the second straight pipe 20, and the elbow joint 30 shown in FIG. 2 have substantially the same diameter. The bending angle of the elbow joint 30 is a right angle (90 degrees). The number of straight pipes may be three or more, and the elbow joint 30 may be three or more. The diameters of the first straight pipe 10, the second straight pipe 20, and the elbow joint 30 may be different. The bending angle of the elbow joint 30 does not have to be a right angle. In FIG. 2, the axis passing through the center of the first straight pipe 10, the second straight pipe 20, and the elbow joint 30 (hereinafter, also referred to as axis O) is represented by a chain line. Hereinafter, the first straight pipe 10, the second straight pipe 20, and the elbow joint 30 are collectively referred to as "piping".

A method of applying a heat insulating material to the pipe will be described with reference to FIG. First, in step S10, a mold release agent is applied to the elbow joint 30. When the heat insulating material is removed from the elbow joint 30, the release agent is applied to suppress the adhesion of the heat insulating material to the elbow joint 30 and to smoothly remove the heat insulating material. As the release agent, any release agent such as liquid paraffin and vegetable wax can be used. In step S10, the mold release agent is applied not only to the elbow joint 30, but also to the vicinity of the ends of the first straight pipe 10 and the second straight pipe 20 on the side connected to the elbow joint 30. Good. In step S10, the outer surface of the elbow joint 30 may be covered with a sheet instead of applying the separation economy.

3 and 4 are explanatory views illustrating the state of step S12. In step S12, a heat insulating member is attached to the straight pipe. Specifically, after covering the first straight pipe 10 with a pair of straight pipe heat insulating members 11 and 12 (FIGS. 3 and 4) having a semi-cylindrical shape, the straight pipe heat insulating members 11 and 12 are fixed. The straight pipe heat insulating members 11 and 12 are fixed, for example, by fixing the circumferential direction with a stainless steel wire or the like (not shown), and then attaching the straight pipe heat insulating member 11 and the straight pipe heat insulating member 12 to the adjacent outer surface. It can be carried out by attaching a moisture-proof tape (not shown). It should be noted that either lashing with a wire or the like and sticking of a moisture-proof tape may be omitted. Similarly, after covering the second straight pipe 20 with a pair of straight pipe heat insulating members 21 and 22 (FIGS. 3 and 4) each having a semi-cylindrical shape, the straight pipe heat insulating members 21 and 22 are fixed. In addition, in FIGS. 3 and 4, the corners of the straight pipe heat insulating members 11 and 12 are in contact with the corners of the straight pipe heat insulating members 21 and 22, but the arrangement of both corners can be arbitrarily determined. For example, they may be arranged at distant positions. In each of the drawings after FIG. 3, the axis O passes through the center of the first straight pipe 10, the second straight pipe 20, the elbow joint 30, the straight pipe heat insulating members 11 and 12, and the straight pipe heat insulating members 21 and 22. Use as the axis.

FIG. 5 is an explanatory view illustrating the covering member 31. FIG. 6 is an explanatory diagram illustrating the state of step S14. In step S14, the covering member 31 is attached to the straight pipe heat insulating members 11 and 12 and the straight pipe heat insulating members 21 and 22. The covering member 31 is made of resin, and as shown in FIG. 5, is a bent-shaped cover having a plurality of openings 31o (two in the example of FIG. 5) and a pair of mating ends 31e. Each opening 31o is provided at both ends of the covering member 31, and is an opening for fitting the ends of the straight pipe heat insulating members 11 and 12 and the straight pipe heat insulating members 21 and 22, respectively. The mating end 31e is a tongue provided on the inner peripheral portion of the bend, and the diameter of the opening 31o can be made variable by changing the mating width (superimposition width) between one tongue 31e and the other tongue 31e. .. The covering member 31 is preferably formed of a resin material having heat resistance, cold resistance, and flexibility, and as the resin material, for example, polypropylene, polyamide, high-density polyethylene polycarbonate, or the like can be used.

The attachment of the covering member 31 will be described with reference to FIGS. 5 and 6. First, one tongue 31e and the other tongue 31e are grasped and pulled in the vertical direction of FIG. 5 to open the covering member 31. In that state, after inserting the covering member 31 from the outer peripheral portion of the bending of the elbow joint 30, the open state of the covering member 31 is released, and the covering member 31 is returned to the shape shown in FIG. As a result, the straight pipe heat insulating members 11 and 12 and the straight pipe heat insulating members 21 and 22 are fitted into the openings 31o at both ends of the covering member 31. As shown by the broken line in FIG. 6, the elbow joint 30 was housed in the internal space of the covering member 31 in a state where the straight pipe heat insulating members 11 and 12 and the straight pipe heat insulating members 21 and 22 were fitted into the openings 31o. It becomes a state. The length of the portion of the covering member 31 covering the straight pipe heat insulating members 11 and 12 and the straight pipe heat insulating members 21 and 22 in the axial direction O direction is preferably 3 mm or more, and more preferably 5 mm. preferable. After that, the mating end 31e of the covering member 31 is fixed and sealed with a moisture-proof tape or the like.

FIG. 7 is an explanatory diagram illustrating the state of step S16. In step S16, the covering member 31 is fixed. Specifically, the moisture-proof tape 32 is wound around the end of the covering member 31 (the end of the opening 31o) and the outer surfaces of the straight pipe heat insulating members 11 and 12 and the straight pipe heat insulating members 21 and 22. To do. As a result, the covering member 31, the straight pipe heat insulating members 11 and 12, and the straight pipe heat insulating members 21 and 22 are fixed.

FIG. 8 is an explanatory diagram illustrating the state of step S18. In step S18, the communication hole 31h is formed in the covering member 31. The communication hole 31h is a through hole that communicates the internal space in which the elbow joint 30 is housed in the covering member 31 with the outside. The communication hole 31h can be formed by cutting a part of the covering member 31 with a cutter. A means such as a drill or heat melting may be used to form the communication hole 31h. The shape of the communication hole 31h can be arbitrarily determined, and in addition to the circular shape shown in FIG. 8, a slit shape, a rectangular shape, a polygonal shape, or the like can be adopted.

FIG. 9 is an explanatory view illustrating a preferable formation range of the communication hole 31h. In the communication hole 31h formed in the step S18, the covering member 31, the straight pipe heat insulating members 11 and 12, and the straight pipe heat insulating members 21 and 22 overlap with the covering member 31 actually attached at the construction site. It is preferable that it is formed in a part of a non-existent range (FIG. 9: a range shown by a diagonal line).

FIG. 10 is an explanatory view illustrating a cross section taken along the line AA of FIG. For the covering member 31 actually attached at the construction site, a virtual surface L (FIG. 10: broken line) that extends along the center line (axis line 31O) of the covering member 31 and cuts the covering member 31 in the vertical direction is set. At this time, the communication hole 31h formed in step S18 is preferably formed within a range of ± θ1 degrees, more preferably within a range of ± θ2 degrees, with reference to the upper end of the virtual surface L. .. θ1 and θ1 can be determined arbitrarily, but θ1 can be set to 45 degrees, and θ2 can be set to 30 degrees, for example. "+" Means the clockwise side in the circumferential direction, and "-" means the counterclockwise side in the circumferential direction.

FIG. 11 is an explanatory diagram illustrating the state of step S20. In step S20, a polyurethane foam liquid as a foaming liquid is injected. Specifically, the polyurethane foam solution is prepared by weighing the polyol stock solution and the polyisocyanate stock solution using a beaker or the like and stirring and mixing them. At this time, if necessary, a foaming agent, a foam stabilizer, a catalyst, a colorant, or the like may be added. Next, the prepared polyurethane foam liquid is injected into the internal space of the covering member 31 through the communication hole 31h of the covering member 31. The injected polyurethane foam liquid foams over time to form a foam 40 that surrounds the elbow joint 30 (FIG. 11: dot hatching). In the example of FIG. 11, all of the internal space of the covering member 31, specifically, the space around the elbow joint 30, and between the inner surface of the covering member 31 and the outer surface of the heat insulating members 11 and 12 for straight pipes. The foam 40 is formed in all of the space and the space between the inner surface of the covering member 31 and the outer surface of the heat insulating members 21 and 22 for straight pipes. However, in step S20, it is sufficient if the foam 40 is formed in the space around the elbow joint 30. The foaming liquid is not limited to the polyurethane foam liquid, and any liquid for forming the foam 40 having heat insulating properties can be used.

FIG. 12 is an explanatory diagram illustrating the state of steps S22 and S24. In step S22, filling / curing is confirmed. Specifically, it is visually confirmed whether the polyurethane foam liquid injected in step S20 is filled in the internal space of the covering member 31. Further, it is visually confirmed whether the polyurethane foam liquid injected in the step S20 has finished foaming and has hardened (whether the formation of the foam 40 has been completed). After confirming the curing, in step S24, the communication hole 31h of the covering member 31 is sealed. Specifically, the communication hole 31h of the covering member 31 is sealed by attaching a moisture-proof tape 33 so as to cover the periphery of the communication hole 31h from the outer surface of the covering member 31. As described above, in the construction method described with reference to FIG. 1, a heat insulating material composed of the covering member 31 and the foam 40 formed in the internal space of the covering member 31 can be easily constructed.

In FIG. 1, steps S14, S18, and S20 correspond to the “method of constructing the heat insulating material”. Further, the step S12 corresponds to the "covering step", the steps S14 and S16 correspond to the "step of attaching the covering member", the step S18 corresponds to the "step of forming the communication hole", and the step S20 corresponds to the "foaming". The step S22 corresponds to the "step of injecting the liquid", the step S22 corresponds to the "step of confirming", and the step S24 corresponds to the "step of sealing the communication hole". Steps other than steps S14, S18, and S20 may be omitted. The covering member 31 and the foam 40 formed in the internal space of the covering member 31 correspond to a "heat insulating material".

As described above, according to the method of constructing the heat insulating material of the first embodiment, the polyurethane foam liquid (foaming liquid) is injected into the internal space of the covering member 31 in which the elbow joint 30 is housed and foamed. A heat insulating material (foam 40) is formed around the elbow joint. Therefore, the pipe diameters such as the diameters of the first straight pipe 10, the second straight pipe 20, and the elbow joint 30, and the pipe shapes such as the shapes of the first straight pipe 10, the second straight pipe 20, and the elbow joint 30. It is not necessary to prepare a plurality of types of piping covers according to piping specifications such as heat insulation conditions in advance, which can reduce the labor and cost of inventory management and can be used regardless of the shape of the elbow joint 30 (example). It is possible to form a heat insulating material suitable for the shape of the elbow joint 30 (even if it is T-shaped or cross-shaped instead of the L-shaped shape). In addition, since it is not necessary to create and assemble a split piece that matches the shape of the elbow joint 30, construction is easy, no skilled work is required for construction, and waste material generated when the split piece is cut out from a heat insulating plate or the like. Loss can be eliminated.

Further, according to the method of constructing the heat insulating material of the first embodiment, the first straight pipe 10 and the second straight pipe 20 are fitted in the state where the straight pipe heat insulating members 11 and 12 and the straight pipe heat insulating members 21 and 22 are fitted. In order to use the covering member 31 (FIG. 5) capable of accommodating the elbow joint 30 for connecting to and in the internal space, the covering member 31 is attached to the straight pipe heat insulating members 11 and 12 and the straight pipe heat insulating members 21 and 22. , The formation of a space (internal space) for injecting the polyurethane foam liquid (foaming liquid) inside the covering member 31 can be carried out quickly and easily. Further, since the covering member 31 can be used as it is as the exterior of the foam 40, deterioration of the foam 40 can be suppressed and the aesthetic appearance can be improved. As a result, according to the method of constructing the heat insulating material of the present embodiment, it is possible to construct the heat insulating material quickly, easily, and at low cost (labor cost, inventory management cost, waste material cost).

Further, in the step S18 for forming the communication hole 31h in the method for constructing the heat insulating material of the first embodiment, the covering member 31, the heat insulating members 11 and 12 for straight pipes, and the straight pipes are directly attached to the covering member 31 actually attached at the construction site. In order to form the communication hole 31h in a part of the range where the heat insulating members 21 and 22 for pipes do not overlap (FIG. 9: diagonal hatching), the polyurethane foam liquid (foaming liquid) to the heat insulating members 11 to 22 for straight pipes is formed. Leakage can be suppressed and a heat insulating material (foam 40) can be easily formed around the elbow joint 30.

Further, in the step S18 for forming the communication hole 31h in the method for constructing the heat insulating material of the first embodiment, the covering member 31 actually attached at the construction site is along the center line (axis line 31O) of the covering member 31. Since the communication hole 31h is formed in a part within the range of ± 45 (± θ1) degrees with reference to the upper end of the virtual surface L (FIG. 10: broken line) that extends and cuts the covering member 31 in the vertical direction, the action of gravity. Therefore, the polyurethane foam liquid (foaming liquid) can be distributed in the internal space of the covering member 31.

Further, in the method of constructing the heat insulating material of the first embodiment, in the step S16 of attaching the covering member 31, the end portion of the covering member 31 and the outer surfaces of the straight pipe heat insulating members 11 and 12 and the straight pipe heat insulating members 21 and 22 Is fixed with the moisture-proof tape 32, so that leakage of the polyurethane foam liquid (foaming liquid) to the straight pipe heat insulating members 11 and 12 and the straight pipe heat insulating members 21 and 22 can be suppressed (FIGS. 7 and 11). In addition, the inside of the covering member 31 can be drip-proof, and the durability of the heat insulating material after construction can be improved. Further, since the step S24 for sealing the communication hole 31h is provided after the injection step S20, the inside of the covering member 31 can be drip-proof, and the durability of the heat insulating material after construction can be improved.

<Second Embodiment>
FIG. 13 is an explanatory view illustrating the method of constructing the heat insulating material in the second embodiment. In the construction method of the second embodiment, when it is determined in step S22 that the internal space of the covering member 31 is not filled with the polyurethane foam liquid (foaming liquid) or the foam 40, steps S18 to S24 are repeated. To do.

FIG. 14 is an explanatory view illustrating a cross section of the covering member 31 along the line AA (FIG. 9). FIG. 14A shows a cross-sectional view at the time when the first steps S18 to S22 are completed, and FIG. 14B shows a cross-sectional view at the time when the second steps S18 to S22 are completed. For example, as shown in FIG. 14A, the foam 40 may not be formed in all of the internal space of the covering member 31 by the first injection and foaming of the polyurethane foam liquid. In particular, since the polyurethane foam liquid has a high viscosity, the foam 40 may not be uniformly formed as shown in FIG. 14 (A) depending on the position of the communication hole 31h formed first, the inclination of the pipe, the size, and the like. is there. In such a case, as shown in FIG. 14B, the communication hole 31h formed in the first step S18 is sealed with the moisture-proof tape 33 to form another communication hole 31h at another location. The position of the other communication hole 31h is preferably a position where the foam 40 communicates with the unformed internal space and is within the range described with reference to FIGS. 9 and 10. After forming the other communication holes 31h, the polyurethane foam liquid is injected again through the communication holes 31h. As described above, by using the communication holes 31h formed at different positions in the first steps S18 to S22 and the second steps S18 to S22, the foam 40 is formed in the internal space in which the foam 40 is not formed. The foam 40 can be easily formed.

As described above, in the above-described method for constructing the heat insulating material, when the foam 40 is not filled in the internal space of the covering member 31, steps S18 to S24 are repeated a plurality of times (or two or more times). May be good. At this time, the communication holes 31h for the first injection of the polyurethane foam liquid and the communication holes 31h for the second injection of the polyurethane foam liquid may be individually provided. On the other hand, the same communication hole 31h may be used for the first and second injections of the polyurethane foam liquid by omitting the second step S18. Even in this way, the same effect as that of the first embodiment described above can be obtained. Further, according to the construction method of the second embodiment, the heat insulating material (foam 40) can be surely formed in the internal space of the covering member 31.

<Third Embodiment>
FIG. 15 is a diagram illustrating a method of constructing the heat insulating material of the third embodiment. In the construction method of the third embodiment, in the step S24 (FIG. 1) of sealing the communication hole 31h of the covering member 31, the communication hole 31h is sealed by using the sealing member 50. The sealing member 50 is a member having a convex portion that fits into the covering member 31, and is formed of, for example, elastic rubber or synthetic resin. In the step S24 of the third embodiment, after the sealing member 50 is fitted into the communication hole 31h, the sealing member 50 and the outer surface of the covering member 31 are fixed by using the moisture-proof tape 33. Even in this way, the same effect as that of the first embodiment described above can be obtained. Further, according to the construction method of the third embodiment, the communication hole 31h can be sealed more tightly.

<Fourth Embodiment>
FIG. 16 is a diagram illustrating a method of constructing the heat insulating material according to the fourth embodiment. In the construction method of the fourth embodiment, in the step of attaching the heat insulating member to the straight pipe (covering step) S12 (FIG. 1), the straight pipe heat insulating member 11 to be attached to the first straight pipe 10 and the second straight pipe 20 are attached. A cross-linking member 60 for bridging the two is provided between the straight pipe heat insulating member 21 to be attached.

The cross-linking member 60 is a plate-shaped or film-shaped member that follows the shape of the elbow joint 30 (L-shaped in the example of FIG. 16), and is formed of, for example, a resin material. The surface of the crosslinked member 60 may be coated with a mold release agent in advance. The cross-linking member 60 may be composed of two thin films having substantially the same shape. In the step S12 of the fourth embodiment, first, the straight pipe heat insulating member 11 is installed in the first straight pipe 10, and the straight pipe heat insulating member 21 is installed in the second straight pipe 20. Next, the cross-linking member 60 is installed with one end of the cross-linking member 60 placed on the straight pipe heat insulating member 11 and the other end placed on the straight pipe heat insulating member 21. In the example of FIG. 16, a small cross-linking member 60 is installed on the inner peripheral side of the bend of the elbow joint 30, and a large cross-link member 60 is installed on the outer peripheral side of the bend of the elbow joint 30, but one of them is omitted. You may. Finally, the straight pipe heat insulating member 12 is put on the straight pipe heat insulating member 11, and the straight pipe heat insulating member 22 is put on the straight pipe heat insulating member 21.

In this way, after the step S14 for attaching the covering member 31 is completed, the internal space of the covering member 31 is in a state of being partitioned by the cross-linking member 60. Even when the cross-linking member 60 is provided, since the polyurethane foam liquid is in a liquid state, it can be filled in the internal space of the covering member 31 through the gap between the cross-linking member 60 and the elbow joint 30. Even in this way, the same effect as that of the first embodiment described above can be obtained. Further, according to the construction method of the fourth embodiment, in the step S12 of covering the straight pipe with a pair of straight pipe heat insulating members, in order to provide the cross-linking member 60 that divides the internal space of the covering member 31, the heat insulating material is removed after the construction. At times, the heat insulating material (foam 40) can be easily decomposed into one and the other with the crosslinked member 60 as a boundary. As a result, the heat insulating material can be easily removed after construction.

<Modification example>
The present invention is not limited to the above-described embodiment, and can be implemented in various aspects without departing from the gist thereof. For example, the following modifications are also possible.

In the first to fourth embodiments, the work procedure and an example of the work contents have been described with respect to the method of constructing the heat insulating material. However, the method of constructing the heat insulating material can be carried out by various work procedures. In addition, various changes can be made to the work contents in each procedure. For example, the polyurethane foam liquid may be prepared in advance prior to the step S20 of injecting the polyurethane foam liquid (for example, at a stage prior to step 10). For example, in the step 18 of forming the communication holes 31h, a plurality of communication holes 31h may be formed at one time with respect to the covering member 31. For example, in the step S22 for confirming filling / curing, confirmation may be performed using thermography that senses a temperature change accompanying foaming of the polyurethane foam liquid. Further, in step S22, confirmation may be performed by the sound when the covering member 31 is hit. For example, after step S24, at least a part of the covering member 31, the heat insulating members 11 and 12 for straight pipes, and the heat insulating members 21 and 22 for straight pipes may be further protected by an exterior material. Further, any bonding agent (sealing material) may be used instead of the moisture-proof tapes 32 and 33.

The configurations of the first to fourth embodiments and the configurations of the modifications may be appropriately combined. For example, in the construction method of the second embodiment, the process 24 described in the third embodiment may be adopted, or the process S12 described in the fourth embodiment may be adopted. The material of the foam 40 described above is preferably a material specified in Japanese Industrial Standards JIS A 9501: 2014, JIS A 9510: 2009, JIS A 9511: 2009 and JIS A 9504: 2011, for example, a foamed plastic material (hard). Urethane foam, polystyrene foam, polyethylene foam, phenol foam, etc.) can be used.

The present embodiment has been described above based on the embodiments and modifications, but the embodiments of the above-described embodiments are for facilitating the understanding of the present embodiment, and do not limit the present embodiment. This aspect can be modified or improved without departing from its purpose and claims, and this aspect includes its equivalents. Moreover, if the technical feature is not described as essential in this specification, it may be deleted as appropriate.

10 ... 1st straight pipe 11, 12 ... Insulation member for straight pipe 20 ... Second straight pipe 21, 22 ... Insulation member for straight pipe 30 ... Elbow joint 31 ... Covering member 31h ... Communication hole 31o ... Opening 32, 33 ... Moisture proof Tape 40 ... Foam 50 ... Sealing member 60 ... Cross-linking member

Claims (7)

It is a method of constructing heat insulating material.
A state in which each of the straight pipe heat insulating members is fitted into each of the openings, which is a resin covering member and has a plurality of openings for fitting the ends of the straight pipe heat insulating members that cover the plurality of straight pipes. In the step of preparing a covering member capable of accommodating the elbow joint connecting the straight pipes in the internal space,
A step of covering each straight pipe with a pair of semi-cylindrical heat insulating members for straight pipes.
The process of attaching the covering member to each of the straight pipe heat insulating members, and
A step of forming a communication hole in the covering member that communicates the internal space of the covering member with the outside.
A step of injecting a foaming liquid from the communication hole into the internal space of the covering member,
Equipped with a,
In the covering step, a plate for bridging each of the straight pipe heat insulating members between one straight pipe heat insulating member attached to the straight pipe and the other straight pipe heat insulating member attached to the other straight pipe. a Jo or film-like cross member, Ru provided bridging member delimiting the inner space of the covering member, the construction method. The construction method according to claim 1.
In the step of forming the communication hole,
A construction method in which the communication hole is formed in a part of the covering member attached to each of the straight pipe heat insulating members within a range in which the covering member and the straight pipe heat insulating member do not overlap. The construction method according to claim 1 or 2.
In the step of forming the communication hole,
A range of ± 45 degrees with respect to the covering member attached to each of the straight pipe heat insulating members, with reference to the upper end of a virtual surface that extends along the axial direction of the covering member and cuts the covering member in the vertical direction. A construction method in which the communication hole is formed in a part of the inside. The construction method according to any one of claims 1 to 3, and further.
In the process of attaching the covering member,
A construction method in which an end portion of the covering member and an outer surface of each of the heat insulating members for straight pipes are fixed with a moisture-proof tape. The construction method according to any one of claims 1 to 4, and further.
After the injection step, a step of confirming whether or not the internal space of the covering member is filled with the foam formed by the foam solution, and a step of confirming.
A construction method in which, when not filled, the step of forming the communication hole, the step of injecting, and the step of confirming are sequentially repeated. The construction method according to any one of claims 1 to 5, and further.
A construction method comprising a step of sealing the communication hole after the step of injecting. It ’s a heat insulating material,
A state in which each of the straight pipe heat insulating members is fitted into each of the openings, which is a resin covering member and has a plurality of openings for fitting the ends of the straight pipe heat insulating members that cover the plurality of straight pipes. In the covering member capable of accommodating the elbow joint connecting the straight pipes in the internal space,
The foam filled in the internal space of the covering member and
A plate or film provided between one of the straight pipe heat insulating members attached to the straight pipe and one of the straight pipe heat insulating members attached to the other straight pipe to crosslink each straight pipe heat insulating member. A cross-linked member having a shape, which separates the internal space of the covering member and the foam.
Insulation material.

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