JP7426024B2 - Piping insulation structure and its construction method - Google Patents

Description

The present invention relates to a heat insulating structure for piping and a method for constructing the same.

Piping is provided in plants for various fluids such as air and water, including nuclear power plants. The outer periphery of piping within a plant is coated to protect it from various external factors.

Japanese Patent Application Publication No. 2015-175506

In order to protect piping from fire and suppress the rise in temperature of the piping, it is necessary to provide the piping with an insulating structure that has heat insulation performance and fire resistance performance. The heat insulating structure can be obtained, for example, by covering the piping with a member having heat insulating properties. However, it is difficult to install it in the limited space inside a building, and a heat-insulating structure with excellent workability has been desired.

The present invention has been made in consideration of such circumstances, and an object of the present invention is to provide a piping insulation structure that is easy to install and a method for installing the same.

In order to solve the above-mentioned problems, the piping insulation structure according to the present invention penetrates a through hole provided in a wall that partitions a first room and a second room, and connects the first room and the second room. Among the piping arranged in the room, at least the piping in the first room is arranged to extend a predetermined length from the through hole on the wall of the first room in a direction away from the through hole. protects the piping located in the first room from the heat of the fire in the event of a fire occurring in the first room, and protects the piping located in the second room from the piping located in the first room. A heat insulating structure that suppresses a rise in temperature of the pipe in the second room due to heat transmitted to the pipe from the through hole, the plurality of heat insulating structures covering the outer periphery of the pipe and having insulation properties against heat outside the pipe. A heating-side insulation material that is a molded body fills an air layer between the piping and the heating-side insulation material, and serves as a secondary insulation material for the heating-side insulation material to provide insulation against heat outside the piping. and a pipe-side heat insulating material, the pipe-side heat insulating material being a blanket wrapped around the pipe .

Further, in the method for constructing a heat insulation structure for piping according to the present invention, the pipe is placed in the first room and the second room by penetrating a through hole provided in a wall that partitions the first room and the second room. Among the piping, at least the piping in the first room is arranged to extend a predetermined length from the through hole on the wall of the first room in a direction away from the through hole; The piping in the first room is protected from the heat of the fire when a fire occurs in the first room, and the piping in the second room is connected to the piping in the second room. A method of constructing a heat insulating structure that suppresses a rise in temperature of the piping in the second room due to heat transmitted from the hole, the method comprising:
A heating-side insulating material that is a plurality of molded bodies having insulating properties against heat outside the piping, and a blanket-shaped piping-side insulating material having an insulating property against heat outside the piping as a secondary insulating material for the heating-side insulating material. a step of wrapping the piping-side insulation material around the piping to fill an air layer between the piping and the heating-side insulation material; The method includes a step of temporarily fixing the heat insulating material, and a step of fixing the heating side heat insulating material with a heat-resistant outer covering material.

The piping heat insulation structure and its construction method according to the present invention are easy to install.

1(a) is a side view, and FIG. 1(b) is a cross-sectional view taken along the line bb in FIG. 1(a). FIG. The perspective view which shows a part of heating side insulation material. An overall configuration diagram of the outer cover cloth. It is a block diagram of a cross-sectional part cover, (a) is a perspective view, (b) is a figure seen from the cross section along the radial direction of piping. FIG. 3 is a block diagram of a heat insulating structure as a first modification, in which (a) is a sectional view of the heat insulating structure when a sleeve is provided in the through hole, and (b) is a cross sectional view of the heat insulating structure when a sealing material is provided. Cross-sectional view. It is a block diagram of the heat insulation structure as a second modification, (a) is a sectional view of the heat insulation structure when the piping has a bent part, (b) is an explanatory diagram of an example having ancillary structures such as valves, (c) is a sectional view of a heat insulating structure when the piping has ancillary structures. It is a lineblock diagram of the heat insulation structure as a 3rd modification, and is a sectional view of the heat insulation structure when a plurality of piping extends adjacently.

Embodiments of a piping heat insulation structure and a construction method thereof according to the present invention will be described based on the accompanying drawings. The piping insulation structure and its construction method according to the present invention can be applied to, for example, piping housed in a building such as a nuclear power plant. For example, it can be applied to cooling water pipes, makeup water systems, pure water makeup water systems, ventilation air conditioning system piping, fire extinguishing piping, gas piping for various gases, etc.

In this embodiment, the pipe 1 is a plant pipe of a nuclear power plant, and an example of the heat insulation structure applied to the pipe 1 passing through a through hole 4 provided in a wall 3 that partitions rooms 2a and 2b will be described. explain. Specifically, when a fire occurs in the room 2a, the heat insulation structure in this embodiment is a heat insulation structure constructed for the purpose of preventing excessive heat transfer from the room 2a to the room 2b via the through hole 4. This will be explained as an example.

FIG. 1 shows an embodiment of a heat insulating structure for piping according to the present invention, in which (a) is a side view, and (b) is a sectional view taken along line bb in FIG. 1 (a).

FIG. 2 is a perspective view showing a part of the heating side heat insulating material 10. As shown in FIG.

FIG. 3 is an overall configuration diagram of the outer cover cloth 30.

FIG. 4 is a configuration diagram of the cross-sectional cover 50, in which (a) is a perspective view and (b) is a view seen from a cross section along the radial direction of the pipe 1.

The heat insulating structure of the pipe 1 includes a heating side heat insulating material 10, a pipe side heat insulating material 20, an outer cover cloth 30, and a cross section cover 50. For example, the heat insulation structure is provided along the length of the pipe 1 to a position where the surface temperature of the pipe 1, which increases when heat from a fire that occurs in the room 2a is transmitted to the room 2b, becomes equal to or lower than a specified temperature. There is. That is, the heat insulating structure is arranged in the piping 1 at a predetermined length from the through hole 4 in each of the rooms 2a and 2b. Therefore, as shown in FIG. 1, the heat insulating structure has an end surface (cross section 55) perpendicular to the outer periphery of the pipe 1 midway along the length of the pipe 1, and may not cover all of the pipe 1. .

The heating side heat insulating material 10 covers the outer periphery of the pipe 1 and has insulation properties against heat outside the pipe 1. The heating side heat insulating material 10 functions as the main heat insulating material in the heat insulating structure. Furthermore, the heating side heat insulating material 10 also has the function of maintaining the strength of the heat insulating structure. The heating side heat insulating material 10 is a molded body 10a formed according to the shape of the pipe 1 to be installed. Specifically, the heating side heat insulating material 10 has a cylindrical shape with a cavity in the center by combining two semi-cylindrical molded bodies 10a shown in FIG. 2. The heating side heat insulating material 10 is made of, for example, alkaline earth silicate (AES) wool, and is made of a material having heat resistance (for example, 1200 degrees) required depending on the temperature of the heat outside the pipe 1. The heating side heat insulating material 10 is formed by vacuum forming, for example, so as to have a density (for example, 250 kg/m ³ ) required as the main heat insulating material.

The pipe-side heat insulating material 20 is formed (filled) between the pipe 1 and the heating-side heat insulating material 10 by being wrapped around the pipe 1 until it has a required diameter, and has insulation properties against heat outside the pipe 1. The piping side heat insulating material 20 functions as a secondary heat insulating material in the heat insulating structure. Moreover, the piping-side heat insulating material 20 also has the function of preparing the inside of the heating-side heat insulating material 10 so that the heating-side heat insulating material 10 can be easily attached. That is, the piping-side insulation material 20 is designed in advance to fit the piping 1 with a certain degree of flexibility so that the heating-side insulation material 10, which is designed in advance according to the shape of the piping 1, comes into close contact with the piping 1 without having an air layer. The air layer between the heat insulating material 10 and the heating side insulation material 10 is filled. The piping side heat insulating material 20 is a blanket-like (sheet-like) member. The piping side insulation material 20 is made of AES wool, for example, like the heating side insulation material 10. The piping side heat insulating material 20 has a lower density (for example, 128 kg/m ³ ) than the heating side heat insulating material 10, which is required as a secondary heat insulating material.

The outer covering cloth 30 (outer covering material) is wrapped around the entire outer periphery of the heating side insulating material 10 and has the function of fixing the heating side insulating material 10 to the pipe 1. The outer cover cloth 30 also has the function of protecting the heating side heat insulating material 10 from dirt and the like. The outer cover cloth 30 is a cross member (covering material). The outer cover cloth 30 is made of a heat-resistant material, for example, a SiO ₂ fiber fabric (silica cloth) coated with polyurethane resin. The outer covering cloth 30 is sewn with SiO ₂ fiber thread (silica yarn). The jacket cloth 30 has a belt 31 for fixing the jacket cloth 30 to the pipe 1 after being wrapped. The belt 31 is made of, for example, SiO ₂ fiber fabric and SUS304.

The cross-section cover 50 is a cover provided to cover a cross-section 55 (an end surface perpendicular to the outer periphery 56) of the heat insulating structure. The cross-section cover 50 is made of SiO ₂ fiber fabric coated with polyurethane resin, similar to the outer cover cloth 30. Further, the cross-section cover 50 is sewn with SiO ₂ fiber threads, similarly to the outer cover cloth 30. The cross-section cover 50 has a fixing belt or the like for fixing the cross-section 55 after covering it. Note that the cross-section cover 50 may be fixed with a hook button 51, as shown in FIG.

Next, the construction method of the heat insulation structure will be explained.

The first step is a step of wrapping the pipe 1 with a blanket-shaped pipe-side heat insulating material 20 having heat insulating properties against heat outside the pipe 1. The piping-side heat insulating material 20 is prepared, for example, by cutting a roll-shaped heat insulating material into required dimensions. Further, the pipe-side heat insulating material 20 has an end portion (an end surface along the thickness direction) that is cut diagonally (for example, at 45 degrees). That is, the end has an end surface that is inclined so that the thickness gradually increases, and at the end, the back surface in contact with the pipe 1 is long and the front surface is short. By using such an end, the difference in level between the pipe 1 at the beginning of winding and the pipe-side heat insulating material 20 can be reduced. As a result, it is possible to eliminate (reduce) the gap between the surface of the pipe 1 and the pipe-side heat insulating material 20 that overlaps the end of the pipe-side heat insulating material 20 at the beginning of winding. Further, from the viewpoint of workability, it is preferable that the ends are fixed to the pipe 1 with an adhesive and then wrapped. By making the pipe-side heat insulating material 20 into a blanket shape in this way, the workability of installing the heat insulating structure is improved.

The second step is a step of temporarily fixing the heating side heat insulating material 10, which is a plurality of molded bodies 10a having heat insulating properties against heat outside the pipe 1, to the outer periphery of the pipe side heat insulating material 20. The molded body 10a (heating-side heat insulating material 10) is prepared, for example, by cutting a long molded body to a required length. When the heating side heat insulating material 10 consists of two molded bodies 10a, the molded bodies 10a are attached to the outer periphery of the piping side heat insulating material 20 from above and below. The attached heating side heat insulating material 10 is temporarily fixed using a jig, and its position is adjusted as appropriate. Thereby, the pipe-side heat insulating material 20 is densely packed between the pipe 1 and the heating-side heat insulating material 10. Note that, from the viewpoint of heat insulation, it is preferable that a member similar to the pipe-side heat insulating material 20 be inserted between the molded bodies 10a adjacent to each other in the length direction of the pipe 1.

The third step is a step of wrapping the heat-resistant outer covering cloth 30 around the outer periphery of the heating side insulating material 10 and fixing the heating side insulating material 10. After the outer covering cloth 30 is wrapped, the outer covering cloth 30 itself is fixed with the belt 31, thereby fixing the inner heating side heat insulating material 10 and the inner piping side heat insulating material 20.

The fourth step is a step of attaching the cross section cover 50. The cross section cover 50 is attached to cover the cross section 55. As described above, the heat insulating structure can be easily installed even in a limited work space.

Such a heat insulating structure can be easily constructed and at the same time can provide sufficient heat insulating performance. That is, the heat insulation structure in this embodiment can suppress the influence of heat and flame on the pipe 1 in the room 2b even if a fire breaks out in the room 2a.

Specifically, in the event of a fire occurring in one room 2a, ensuring the integrity of various equipment placed in the other room 2b across the wall 3, or in case of an emergency by workers in the room 2b. operations may be required. In that case, the heat of the fire may be transferred to the other room 2b through the pipe 1 arranged in the through hole 4, which may impede the soundness of the equipment and emergency work as described above. Therefore, the heat insulation structure of this embodiment can suppress heat transfer to the other room 2b due to a fire via the pipe 1.

Further, the thickness of the heat insulating structure and the length of the heat insulating structure from the through hole 4 are set depending on the limit on the temperature rise in the other room 2b. Therefore, if this limit (condition) is known, the thickness and length of the heat insulating structure can be set so as not to exceed the limit value.

Although several embodiments of the invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and changes can be made without departing from the gist of the invention. These embodiments and their modifications are included within the scope and gist of the invention, as well as within the scope of the invention described in the claims and its equivalents.

For example, FIG. 5 is a block diagram of a heat insulating structure as a first modification, in which (a) is a cross-sectional view of the heat insulating structure when a sleeve 60 is provided in the through hole 4, and (b) is a cross-sectional view of the heat insulating structure when a sleeve 60 is provided in the through hole 4. It is a sectional view of the heat insulation structure when provided.

As shown in FIG. 5(a), a sleeve 60 is provided on the wall 3, and as shown in FIG. 5(b), a sealing material 61 (such as a rubber boot or ) may be provided. In this case, the dimensions (inner diameter and outer diameter) of the piping side insulating material 20 and the heating side insulating material 10 near the wall 3 are designed by regarding the maximum outer diameter of the sleeve 60 or the sealing material 61 as the inner diameter of the heat insulating structure. is preferred. Since it is difficult to uniformly wrap the pipe-side heat insulating material 20 around the sleeve 60 portion or the sealing material 61 portion, the number of turns may be adjusted partially or the pipe-side heat insulating material 20 may be separately filled partially. As a result, the inside of the heating side heat insulating material 10 is filled.

FIG. 6 is a block diagram of a heat insulating structure as a second modification, in which (a) is a cross-sectional view of the heat insulating structure when the pipe 1 has a bent portion 71, and (b) is a diagram showing ancillary structures such as a valve 72. (c) is a sectional view of a heat insulating structure when the pipe 1 has an attached structure.

When the piping 1 has a bent portion 71 as shown in FIG. 6(a), even when it has ancillary structures such as a valve 72 as shown in FIG. 6(b), the piping side insulation material 20 and the heating side insulation Similar effects can be obtained by appropriately adjusting the shape and dimensions of the material 10. That is, when the bent portion 71 is provided, the heating side insulating material 10 is formed along the bent portion 71, and the inside of the heating side insulating material 10 is filled with the piping side insulating material 20. Furthermore, when ancillary structures such as the valve 72 are included, the maximum outer diameter of the ancillary structure such as the valve 72 is regarded as the inner diameter of the heat insulating structure. Similar to the first modification, the heating side heat insulating material 10 is molded according to this inner diameter, and the inside of the heating side heat insulating material 10 is filled with the piping side heat insulating material 20.

Furthermore, FIG. 7 is a configuration diagram of a heat insulating structure as a third modification, and is a sectional view of the heat insulating structure when a plurality of pipes 1a, 1b, 1c, and 1d extend adjacent to each other.

When a plurality of pipes 1a, 1b, 1c, and 1d (pipes 1) extend adjacent to each other, one heat insulation structure may be installed on the plurality of pipes 1. In this case, the heating side heat insulating material 10 has a square cross-sectional shape along the direction perpendicular to the length direction of the pipe 1 by combining four plate-shaped molded bodies 81 having a required thickness as the main heat insulating material. It may be formed into a box shape.

The materials of the above-mentioned heat insulating materials 10, 20 and outer cover cloth 30 may be selected as appropriate depending on the required adiabatic temperature. For example, the heat insulating materials 10 and 20 may be ceramic fibers such as amorphous refractory ceramic fibers (RCF), alumina fibers, or glass fibers. Instead of the outer cover cloth 30, a steel plate (racking) may be used.

Further, the shape of the heating side heat insulating material 10 is not limited to a cylindrical shape, but may be other shapes such as a square prism. The pipe-side heat insulating material 20 is not limited to a blanket shape, and may be any material that can be filled according to the shape between the pipe 1 and the heating-side heat insulating material 10. The outer cover cloth 30 is not limited to the belt 31, and may have a hook, a hook button, or the like as a fixing means.

1 Piping 2a, 2b Room 3 Wall 4 Through hole 10 Heating side insulation material 10a, 81 Molded body 20 Piping side insulation material 30 Outer cover cloth 31 Belt 50 Cross section cover 51 Hook button

Claims (6)

Of the piping that is arranged in the first room and the second room through a through hole provided in a wall that partitions the first room and the second room, at least the pipe that is located in the first room is The pipe is arranged to extend a predetermined length from the through hole on the wall of the first room in a direction away from the through hole, and the pipe is arranged to extend a predetermined length from the through hole on the wall of the first room in a direction away from the through hole. The piping in the second room is protected from the heat of the fire by the heat transmitted from the piping in the first room to the piping in the second room from the through hole. A heat insulating structure that suppresses temperature rise,
a heating-side insulating material that is a plurality of molded bodies that covers the outer periphery of the piping and has heat insulation properties against heat outside the piping;
a piping-side insulation material that fills an air layer between the piping and the heating-side insulation material and has insulation properties against heat outside the piping as a secondary insulation material for the heating-side insulation material ;
A piping insulation structure , wherein the piping-side insulation material is a blanket wrapped around the piping . The heat insulating structure has an end face perpendicular to the outer periphery midway along the length of the pipe,
The piping insulation structure according to claim 1 , further comprising a cross-sectional cover that covers the end surface. The piping insulation structure according to claim 1 or 2 , further comprising a heat-resistant outer covering material that fixes the heating-side insulation material to the piping. 4. The piping insulation structure according to claim 3, wherein the jacket material is a cloth wrapped around the heating side insulation material. The piping insulation structure according to any one of claims 1 to 4, wherein the piping is piping for a nuclear power plant. Of the piping that is arranged in the first room and the second room through a through hole provided in a wall that partitions the first room and the second room, at least the pipe that is located in the first room is The pipe is arranged to extend a predetermined length from the through hole on the wall of the first room in a direction away from the through hole, and the pipe is arranged to extend a predetermined length from the through hole on the wall of the first room in a direction away from the through hole. The pipes located in the second room are protected from the heat of the fire, and the pipes located in the second room are protected from heat transmitted from the pipes located in the first room to the pipes located in the second room through the through holes. A method of constructing a heat insulating structure to suppress temperature rise, the method comprising:
A heating-side insulating material that is a plurality of molded bodies having insulating properties against heat outside the piping, and a blanket-shaped piping-side insulating material having an insulating property against heat outside the piping as a secondary insulating material for the heating-side insulating material. The process of preparing the materials;
Wrapping the piping-side insulation material around the piping to fill an air layer between the piping and the heating-side insulation material;
temporarily fixing the heating side insulation material to the outer periphery of the piping side insulation material;
A method for constructing a heat insulating structure for piping, comprising the step of fixing the heating side heat insulating material with a heat-resistant jacket material.

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