JP6878331B2 - Piping covering structure and construction method of piping covering structure - Google Patents

Description

The present disclosure relates to a pipe covering structure and a method of constructing the pipe covering structure.

The surface of the cooling water pipe of a power plant or the like is covered with a dew-proof material to prevent dew condensation. Generally, as the dew-proof material, a material having excellent heat insulating properties and sealing properties (for example, urethane, polyurethane foam, etc.) is used from the viewpoint of preventing dew condensation. On the other hand, from the viewpoint of fire protection, non-combustibility is required, and the Building Standards Law stipulates that non-combustible materials should be used.
Patent Document 1 discloses a configuration in which the surface of the dew-proof material is covered with a metal plate having high fire-proof performance such as an aluminum alloy to prevent decomposition and burning of the dew-proof material.

JP-A-2015-175506

In the fire prevention method disclosed in Patent Document 1, it is not easy to cover the periphery of the pipe with a metal plate, and the cost is high. In particular, it is difficult to install the pipe on a pipe having a plurality of shapes such as a Y-shaped pipe.
Another possible method is to apply a non-combustible paint that combines highly viscous minerals such as water-based emulsion resin, water glass, and magnesium silicate to the dew-proof material, but if the application area is large, uniform application is difficult. , There are problems such as peeling and cracking during drying due to variations in water content.

One embodiment aims to solve the above-mentioned problems when applying a nonflammable paint to a dew-proof material coated on the surface of a pipe, eliminate peeling and cracking of the non-combustible paint, and maintain fire protection performance. And.

(1) The pipe covering structure according to the embodiment is
Dew-proof material coated on the outer surface of the piping through which the cooling fluid flows,
A first mesh-like member coated on the surface of the dew-proof material, the first mesh-like member formed of a thermally conductive material, and
A coating layer formed by applying a nonflammable paint to the surface of the first mesh member, and
To be equipped.

According to the configuration of (1) above, since the first mesh-like member is highly deformable, it can be easily attached to the surface of the pipe and can be applied to a pipe having a complicated shape. Further, since the first mesh-like member is formed of a heat conductive material, heat is dissipated through the first mesh-like member and heat does not stay, so that the dew-proof material does not become locally hot. .. Therefore, the heat resistance performance of the dew-proof material can be improved. Further, since a coating layer made of a nonflammable paint is applied to the surface of the first mesh member, the fire resistance performance can be improved, and the coating layer adheres to the surfaces of the first mesh member and the dew-proof material. Since the adhesive force is increased, it is possible to suppress the peeling of the coating layer from the surface of the first mesh-like member or the dew-proof material. Further, since the coating layer made of the nonflammable paint is divided into a large number of narrow regions by the first mesh-like member, cracks due to non-uniform coating can be suppressed. As a result, the fire resistance can be maintained for a long period of time.

(2) In one embodiment, in the configuration of (1) above,
The first mesh-like member is made of a metal net formed by arranging metal mesh threads in a grid pattern.
According to the configuration (2) above, since the first mesh-like member is composed of a metal mesh thread having high thermal conductivity and high rigidity, heat resistance performance and durability performance can be improved.

(3) In one embodiment, in the configuration of (1) above,
The first mesh-like member is made of a carbon fiber sheet formed by weaving carbon fibers in a mesh shape.
Here, "lattice-like" and "mesh-like" are distinguished mainly by the difference in the opening of the first mesh-like member, and "mesh-like" means that the opening is finer than "lattice-like". For example, the mesh size of the "mesh-like" first mesh-like member is in the range of several μm to several mm, and the mesh size of the "lattice-like" first mesh-like member is in the range of several mm to several hundred mm. ..
According to the configuration of (3) above, since carbon fiber having high thermal conductivity is used as the first mesh-like member, the heat resistance performance can be further improved. Further, since the first mesh-like member is composed of a carbon fiber sheet in which carbon fibers are woven in a mesh shape, the coating layer made of nonflammable paint is further divided into finer regions by the first mesh-like member. The adhesive force to the mesh-like member is increased, and peeling and cracking can be suppressed.

(4) In one embodiment, in the configuration of (3) above,
The carbon fiber sheet is coated on the surface of the dew-proof material in a stretched state.
According to the configuration (4) above, since the carbon fiber sheet is coated on the surface of the dew-proof material in a stretched state, the adhesive force of the carbon fiber to the surface of the dew-proof material can be enhanced and the shape is complicated. The carbon fiber sheet can be adhered to and coated on the pipe surface even in the case of construction on the pipe.

(5) In one embodiment, in any of the configurations (1) to (4) above,
A second mesh-like member coated on the surface of the first mesh-like member, further comprising a second mesh-like member formed of a thermally conductive material.
The size of the mesh opening of the second mesh-like member is smaller than the size of the mesh opening of the first mesh-like member.
According to the configuration of the above (5), the second mesh-like member having a finer opening than the first mesh-like member on the outside of the nonflammable paint applied to the surfaces of the first mesh-like member and the first mesh-like member. The coating layer made of the nonflammable paint can be protected by the second mesh member. Further, since the heat propagation can be promoted by arranging the second mesh-like member, the fire resistance performance of the dew-proof material can be further improved, and the combustion of the dew-proof material can be suppressed.

(6) In one embodiment, in any of the configurations (1) to (5) above,
The pipe comprises a cooling system pipe through which cooling water flows, which is arranged in a power plant.
According to the configuration of (6) above, the heat resistance and fire resistance of the dew-proof material coated on the cooling system piping arranged in the power plant are improved, and the peeling and cracking of the coating layer made of nonflammable paint are suppressed. The fire resistance can be maintained for a long time.

(7) The construction method of the pipe covering structure according to the embodiment is as follows.
The first step of coating the surface of the dew-proof material coated on the outer surface of the pipe through which the cooling fluid flows with the first mesh-like member formed of the heat conductive material, and
The second step of forming a coating layer by applying a nonflammable paint to the surface of the first mesh member, and
To be equipped.

According to the method (7) above, since the first mesh-like member is highly deformable, it can be easily attached to the surface of the pipe and can be applied to a pipe having a complicated shape. Further, since the first mesh-like member is formed of a heat conductive material, heat is dissipated through the first mesh-like member and heat does not stay, so that the dew-proof material does not become locally hot. .. Therefore, the heat resistance performance of the dew-proof material can be improved. Further, since a coating layer made of a nonflammable paint is applied to the surface of the first mesh member, the fire resistance performance can be improved, and the coating layer adheres to the surfaces of the first mesh member and the dew-proof material. Since the adhesive force is increased, it is possible to suppress the peeling of the coating layer from the surface of the first mesh-like member or the dew-proof material. Further, since the coating layer made of the nonflammable paint is divided into a large number of narrow regions by the first mesh-like member, cracks due to non-uniform coating can be suppressed. As a result, the fire resistance can be maintained for a long period of time.

(8) In one embodiment, in the configuration of (7) above,
The first mesh-like member is made of a carbon fiber sheet formed by weaving carbon fibers in a mesh shape.
In the first step, the surface of the dew-proof material is coated with the stretched carbon fiber sheet.
According to the method (8) above, since the carbon fiber sheet is coated on the surface of the dew-proof material in a stretched state, the adhesive force of the carbon fiber to the surface of the dew-proof material can be enhanced and the shape is complicated. The carbon fiber sheet can be adhered to and coated on the pipe surface even in the case of construction on the pipe.

(9) In one embodiment, in the method (7) or (8) above,
After the second step, a third mesh member formed from a heat conductive material on the surface of the first mesh member and having a mesh opening smaller than that of the first mesh member is coated. Prepare more steps.
According to the method (9) above, the size of the mesh opening is smaller than that of the first mesh member on the outside of the nonflammable paint applied to the surfaces of the first mesh member and the first mesh member. Since the second mesh member is further coated, the coating layer made of the nonflammable paint can be protected by the second mesh member. Further, since the heat propagation can be promoted by arranging the second mesh-like member, the fire resistance performance of the dew-proof material can be further improved, and the combustion of the dew-proof material can be suppressed.

(10) In one embodiment, in any of the methods (7) to (9) above,
The pipe comprises a cooling system pipe through which cooling water flows, which is arranged in a power plant.
According to the method (10) above, the heat resistance and fire resistance of the dew-proof material coated on the cooling system piping arranged in the power plant are improved, and the peeling and cracking of the coating layer made of nonflammable paint are suppressed. The fire resistance can be maintained for a long time.

According to some embodiments, the dew-proof material is provided with a coating layer made of a first mesh member and a non-combustible paint on the dew-proof material coated on the surface of the pipe through which the cooling fluid flows, so that the dew-proof material has heat resistance and fire resistance. The performance can be improved, and the fire resistance can be maintained for a long period of time by suppressing peeling and cracking of the coating layer.

It is a perspective view which shows the pipe covering structure which concerns on one Embodiment. It is a perspective view which shows the pipe covering structure which concerns on one Embodiment. It is sectional drawing of the pipe covering part which concerns on one Embodiment. It is a top view of the 1st mesh-like member which concerns on one Embodiment. It is explanatory drawing for demonstrating the classification of a mesh-like member. It is a process drawing which shows the construction method of the pipe covering structure which concerns on one Embodiment.

Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described as embodiments or shown in the drawings are not intended to limit the scope of the present invention to this, and are merely explanatory examples. Absent.
For example, expressions that represent relative or absolute arrangements such as "in a certain direction", "along a certain direction", "parallel", "orthogonal", "center", "concentric" or "coaxial" are exact. Not only does it represent such an arrangement, but it also represents a state of relative displacement with tolerances or angles and distances to the extent that the same function can be obtained.
Further, for example, an expression representing a shape such as a quadrangular shape or a cylindrical shape not only represents a shape such as a quadrangular shape or a cylindrical shape in a geometrically strict sense, but also includes a concavo-convex portion or a concavo-convex portion within a range in which the same effect can be obtained. The shape including the chamfered portion and the like shall also be represented.
On the other hand, the expressions "equipped", "equipped", "equipped", "included", or "have" one component are not exclusive expressions that exclude the existence of other components.

1 and 2 show the pipe covering structure 10 (10A, 10B) according to some embodiments.
In FIGS. 1 and 2, since the outer surface of the pipe 12 through which the cooling fluid flows is cooled by the cooling fluid, dew condensation is likely to occur. Therefore, the surface of the pipe 12 is covered with the dew-proof material 14. The dew-proof material 14 is made of a material having excellent heat insulating properties and sealing properties, such as urethane and polyurethane foam. On the other hand, the dew-proof material 14 is required to be nonflammable under the Building Standards Act from the viewpoint of fire protection.

As shown in FIGS. 1 and 2, the surface of the dew-proof material 14 is coated with the first mesh-like member 16 (16a, 16b). The first network member 16 is made of a heat conductive material such as metal. Further, a nonflammable paint is applied to the surface of the first mesh member 16, and a coating layer 18 made of the nonflammable paint is formed.
Although the covering layer 18 is shown in FIGS. 1 and 2 so as to exist only in one mesh of the first mesh member 16, the covering layer 18 is all the meshes of the first mesh member 16. Exists in.

According to the above configuration, since the first mesh-like member 16 is highly deformable, it can be easily attached to the surface of the pipe 12 and can be applied to a pipe having a complicated shape. Further, since the first mesh-like member 16 is formed of a heat conductive material, heat is dissipated through the first mesh-like member 16 and heat does not stay, so that the dew-proof material 14 locally becomes hot. Never. Therefore, the heat resistance performance of the dew-proof material 14 can be improved. Further, since the coating layer 18 made of a nonflammable paint is applied to the surface of the first mesh member 16, the fire resistance performance can be improved, and the coating layer 18 is formed on the surfaces of the first mesh member 16 and the dew-proof material 14. Since the adhesive force is increased by the adhesion, it is possible to suppress the peeling of the coating layer 18 from the surface of the first mesh-like member 16 and the dew-proof material. Further, since the coating layer 18 is divided into a large number of narrow regions by the first mesh member 16, cracks due to non-uniform coating can be suppressed. As a result, the fire resistance can be maintained for a long period of time, and the non-combustible performance that meets the Building Standards Act can be obtained.

In one embodiment, for example, a glass paint is used as the nonflammable paint. The cooling fluid flowing through the pipe 12 is, for example, a liquid or gas cooling fluid, and in the case of a liquid, for example, cooling water.

FIG. 3 is a cross-sectional view of the covering layer 18 according to the embodiment, and is a cross-sectional view taken along the line AA in FIG.
As shown in FIG. 3, the nonflammable paint is applied between the first mesh members 16 to form the coating layer 18. The coating layer 18 accumulates in the recesses formed between the meshes of the first mesh-like member 16 and adheres to the first mesh-like member 16 and the dew-proof material 14, so that the adhesive force can be increased and the peeling can be suppressed. Further, by dividing the coating layer 18 for each mesh of the first mesh member 16, cracks due to coating unevenness can be suppressed. Even when the height of the coating layer exceeds the height of the first mesh-like member 16 and exceeds the mesh of the first mesh-like member 16 as in the case of the coating layer 18', the first of the coating layer 18 is integrated. The adhesive strength to the mesh member 16 and the dew-proof material 14 does not decrease.

In one embodiment, as shown in FIG. 1, the first mesh-like member 16 (16a) is composed of a metal net in which metal mesh threads are arranged in a grid pattern. The first mesh member 16 is made of, for example, stainless steel.
According to this embodiment, since the first mesh-like member 16 (16a) is made of a metal mesh thread having high thermal conductivity and high rigidity, heat resistance performance and durability performance can be improved.

In one embodiment, as shown in FIG. 2, the first mesh member 16 (16b) is made of a carbon fiber sheet formed by weaving carbon fibers in a mesh shape.
In the present specification, "lattice-like" and "mesh-like" are defined separately as follows. As shown in FIG. 5, "lattice-like" and "mesh-like" are distinguished mainly by the difference in the size of the mesh opening M of the first mesh-like member 16. That is, "mesh-like" means that the mesh opening M is smaller than that of "lattice-like". For example, the size of the "mesh-like" opening is in the range of several μm to several mm, and the size of the "lattice-like" opening is in the range of several mm to several hundred mm.

According to this embodiment, since carbon fiber having high thermal conductivity is used as the first mesh member 16 (16b), the heat resistance performance can be further improved. Further, since the first mesh-like member 16 (16b) is composed of a carbon fiber sheet formed by weaving carbon fibers into a mesh having a fine mesh opening, the first coating layer 18 made of a nonflammable paint is formed. 1 The adhesive force to the surface of the mesh-like member 16 and the dew-proof material 14 can be further improved.

In one embodiment, as shown in FIG. 4, the first mesh-like member 16 (16b) made of the carbon fiber sheet is coated on the surface of the dew-proof material 14 in a stretched state.
According to this embodiment, since the carbon fiber sheet is coated on the surface of the dew-proof material 14 in a stretched state, it is possible to increase the adhesive force of the carbon fiber to the surface of the dew-proof material, and the piping has a complicated shape. The carbon fiber sheet can be adhered to the pipe surface and covered even in the case of the construction.

In FIG. 4, by applying a tensile force f from both sides to the first mesh-like member 16 (16b) made of the carbon fiber sheet, the carbon fiber sheet can be stretched and the mesh opening M can be widened. .. Therefore, the mesh opening M can be increased by manufacturing a carbon fiber sheet having a small mesh opening M and stretching the carbon fiber sheet and attaching it to the surface of the dew-proof material 14 at the time of construction on the pipe 12.
In this way, the size of the opening M can be adjusted by stretching the carbon fiber sheet at the time of construction on the pipe 12.

In one embodiment, as shown in FIG. 2, the surface of the first mesh-like member 16 (16a, 16b) coated on the surface of the dew-proof material 14 and the surface of the first mesh-like member 16 are nonflammable. The paint is further coated with the second mesh member 20. The second mesh member 20 is formed of a heat conductive material like the first mesh member 16. The size of the mesh opening of the second mesh member 20 is smaller than the size of the mesh opening of the first mesh member 16.
According to this embodiment, the second mesh member 20 having a finer mesh than the first mesh member 16 is outside the nonflammable paint applied to the surfaces of the first mesh member 16 and the first mesh member 16. The coating layer 18 made of a nonflammable paint can be protected by the second mesh member 20. Further, since the heat propagation can be promoted by arranging the second mesh member 20, the fire resistance performance of the dew-proof material 14 can be further improved, and the combustion of the dew-proof material 14 can be suppressed.

In one embodiment, the first mesh-like member 16 is made of a metal net formed by arranging metal mesh threads in a grid pattern, and the second mesh-like member 20 is formed by arranging metal mesh threads in a mesh shape. It consists of a metal net.
According to this embodiment, since both the first mesh-like member 16 and the second mesh-like member 20 are made of metal mesh thread, the heat resistance performance and durability performance of the dew-proof material 14 can be further improved. Further, the protection of the coating layer 18 can be strengthened by the second mesh member 20, and peeling and cracking of the coating layer 18 can be suppressed.

In one embodiment, the first mesh-like member 16 is made of a metal net formed by arranging metal mesh threads in a grid pattern, and the second mesh-like member 20 is formed by weaving carbon fibers in a mesh shape. It consists of a carbon fiber sheet.
According to this embodiment, the heat resistance performance and durability performance of the dew-proof material 14 can be enhanced by the first mesh-like member 16, and the coating layer 18 can be protected by the second mesh-like member 20. Further, the arrangement of the second mesh-like member 20 can suppress peeling and cracking of the coating layer 18.

In one embodiment, the first mesh-like member 16 and the second mesh-like member 20 are made of a carbon fiber sheet formed by weaving carbon fibers in a mesh shape, and the second mesh-like member 20 is a first mesh-like member. The size of the mesh opening of the member 16 is smaller than that of the first mesh member 16.
According to this embodiment, the heat resistance performance and the fire resistance performance of the dew-proof material 14 can be enhanced, and the coating layer 18 can be protected by the second mesh-like member 20. Further, the arrangement of the second mesh-like member 20 can suppress peeling and cracking of the coating layer 18.

As shown in FIG. 2, in the embodiment including the first mesh member 16 and the second mesh member 20, a coating layer further coated with a nonflammable paint is formed on the surface of the second mesh member 20. It may be.
Thereby, the fire resistance performance of the dew-proof material 14 can be further improved.

In one embodiment, the first mesh member 16 and the second mesh member 20 are made of a material having a thermal conductivity of 10 W / m · K or more.
As a result, heat dissipation from the dew-proof material 14 can be promoted, and a high temperature rise due to local heat retention and ignition of the dew-proof material 14 can be suppressed.

In one embodiment, the pipe 12 comprises a cooling system pipe through which cooling water flows, which is arranged in a power plant such as nuclear power or thermal power.
According to this embodiment, the heat resistance performance and the fire resistance performance of the dew-proof material 14 coated on the cooling system piping arranged in the power plant are enhanced, and the peeling and cracking of the coating layer 18 made of the nonflammable paint are suppressed. Fire resistance can be maintained for a long time.

As shown in FIG. 6, a method of constructing a pipe covering structure according to an embodiment is a method in which a heat conductive material is formed on the surface of a dew-proof material 14 coated on the outer surface of a pipe 12 through which a cooling fluid flows. 1 The mesh-like member 16 is covered (first step S10). Next, the coating layer 18 is formed by applying a nonflammable paint to the surface of the first mesh-like member 16 (second step S12).

According to the above method, since the first mesh-like member 16 is highly deformable, it can be easily attached to the surface of the pipe 12 and can be applied to a pipe having a complicated shape. Further, since the first mesh-like member 16 is formed of a heat conductive material, heat is dissipated through the first mesh-like member 16 and heat does not stay, so that the dew-proof material 14 locally becomes hot. Never. Therefore, the heat resistance performance of the dew-proof material 14 can be improved. Further, since the coating layer 18 made of a nonflammable paint is applied to the surface of the first mesh member 16, the fire resistance performance can be improved, and the coating layer 18 is formed on the surfaces of the first mesh member 16 and the dew-proof material 14. Since the adhesive force is increased by the adhesion, it is possible to suppress the peeling of the coating layer 18 from the surface of the first mesh-like member 16 and the dew-proof material. Further, since the coating layer 18 is divided into a large number of narrow regions by the first mesh member 16, cracks due to non-uniform coating can be suppressed. As a result, the fire resistance can be maintained for a long period of time, and the non-combustible performance that meets the Building Standards Act can be obtained.

In one embodiment, the first mesh member 16 is made of a carbon fiber sheet formed by weaving carbon fibers in a mesh shape. In the first step S10, the surface of the dew-proof material 14 is coated with the stretched carbon fiber sheet.
According to this embodiment, since the carbon fiber sheet is coated on the surface of the dew-proof material 14 in a stretched state, the adhesive force of the carbon fiber to the surface of the dew-proof material can be enhanced, and the piping has a complicated shape. The carbon fiber sheet can be adhered to the pipe surface and covered even in the case of the construction.

In one embodiment, after the second step S12, a second mesh member formed of a heat conductive material on the surface of the first mesh member 16 and having a mesh opening smaller than that of the first mesh member 16. 20 is coated (third step S14).
According to this embodiment, the size of the mesh opening is smaller than that of the first mesh member on the outside of the nonflammable paint applied to the surfaces of the first mesh member 16 and the first mesh member 16. Since the mesh-like member 20 is further covered, the coating layer 18 made of the nonflammable paint can be protected by the second mesh-like member 20. Further, since the heat propagation can be promoted by arranging the second mesh member 20, the fire resistance performance of the dew-proof material 14 can be further improved, and the combustion of the dew-proof material 14 can be suppressed.

In one embodiment, the pipe 12 comprises a cooling system pipe through which cooling water flows, which is arranged in a power plant.
According to this embodiment, the heat resistance performance and the fire resistance performance of the dew-proof material 14 coated on the cooling system piping arranged in the power plant are enhanced, and the peeling and cracking of the coating layer 18 made of the nonflammable paint are suppressed. Fire resistance can be maintained for a long time.

According to some embodiments, when the nonflammable paint is applied to the dew-proof material coated on the surface of the pipe, the non-combustible paint can be prevented from peeling or cracking, and the fire protection performance can be maintained for a long period of time. For example, in a power plant such as a nuclear power plant or a thermal power plant, it can be applied to a pipe through which a cooling fluid such as cooling water flows.

10 (10A, 10B) Piping covering structure 12 Piping 14 Dew-proof material 16 (16a, 16b) 1st mesh member 18, 18'Coating layer 20 2nd mesh member M Opening f Tensile force

Claims (10)

Dew-proof material coated on the outer surface of the piping through which the cooling fluid flows,
A first mesh-like member coated on the surface of the dew-proof material, the first mesh-like member formed of a thermally conductive material, and
A coating layer formed by applying a nonflammable paint to the surface of the first mesh member, and
A pipe covering structure characterized by being provided with. The pipe covering structure according to claim 1, wherein the first mesh-like member comprises a metal net formed by arranging metal mesh threads in a grid pattern. The pipe covering structure according to claim 1, wherein the first mesh-like member is made of a carbon fiber sheet formed by weaving carbon fibers in a mesh shape. The pipe coating structure according to claim 3, wherein the carbon fiber sheet is coated on the surface of the dew-proof material in a stretched state. A second mesh-like member coated on the surface of the first mesh-like member, further comprising a second mesh-like member formed of a thermally conductive material.
The item according to any one of claims 1 to 4, wherein the size of the mesh opening of the second mesh-like member is smaller than the size of the mesh opening of the first mesh-like member. Piping covering structure. The pipe covering structure according to any one of claims 1 to 5, wherein the pipe comprises a cooling system pipe through which cooling water flows, which is arranged in a power plant. The first step of coating the surface of the dew-proof material coated on the outer surface of the pipe through which the cooling fluid flows with the first mesh-like member formed of the heat conductive material, and
The second step of forming a coating layer by applying a nonflammable paint to the surface of the first mesh member, and
A method of constructing a pipe covering structure, which is characterized by being provided with. The first mesh-like member is made of a carbon fiber sheet formed by weaving carbon fibers in a mesh shape.
The method for constructing a pipe covering structure according to claim 7, wherein in the first step, the surface of the dew-proof material is coated with the stretched carbon fiber sheet. After the second step, a third mesh member formed from a heat conductive material on the surface of the first mesh member and having a mesh opening smaller than that of the first mesh member is coated. The method for constructing a pipe covering structure according to claim 7 or 8, further comprising a step. The method for constructing a pipe covering structure according to any one of claims 7 to 9, wherein the pipe comprises a cooling system pipe through which cooling water flows, which is arranged in a power plant.

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