JPH1161722A - Pipe for heating medium-circulation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe capable of resisting against a snow melting agent and enhance the workability by constituting the pipe with an outer layer made of heat-resistant synthetic resin, an inner layer made of a chemical-resistant synthetic resin and an adhesive layer provided between the outer layer and the inner layer. SOLUTION: A heat medium circulating pipe 1 is constituted with an outer layer 3 made of a heat-resistant synthetic resin, an inner layer 2 made of a chemical-resistant synthetic resin, and an adhesive layer 4. Next, a concrete layer is laid on a foundation subbase, grille-shaped steel wire is arranged on the concrete layer, the pipe 1 is laid, and high-temperature asphalt is poured while flowing cooling water through the pipe 1 thereby forming the asphalt layer. Next, even though such high-temperature asphalt is poured, the outer layer 2 is not deformed, thus the cooling to the minimum temperature for laying asphalt is not required any more and the work can be simplified. Then, even though the outer layer 2 is invaded and cracking occurs by a snow melting agent sprayed to the layer finished with asphalt, the inner layer 3 will never be corroded and warm water passing through the inside of the pipe 1 will never be leaked out thereby permitting the use of this pipe for many years.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat medium circulation pipe mainly used for snow melting, heating and cooling. Especially,
The present invention relates to a heat medium circulation pipe suitable for being buried in an asphalt layer provided on a road surface for the purpose of melting snow or the like.

[0002]

2. Description of the Related Art Conventionally, as a heat medium circulating pipe buried in an asphalt layer provided on a road surface for the purpose of melting snow or the like, Japanese Patent Publication No. 52-40133 and Japanese Patent Publication No. 54-1
As described in JP-B-6653, polyethylene pipes and nylon pipes are often used.

[0003] An example of a method of constructing this pipe will be described. First, concrete or coarse asphalt is poured on the foundation surface of a road, and after these are solidified, a grid-like iron wire is provided on the road surface, and polyethylene is formed thereon. A pipe or a nylon pipe is piped, and the polyethylene pipe or the nylon pipe is fixed to a grid-like iron wire with a suitable fixing bracket (for example, a thin metal wire). Next, asphalt heated to 170 to 180 ° C. is driven into the road surface while cooling water such as water is passed through the polyethylene pipe or the nylon pipe, and is flattened. Was being constructed.

[0004] At this time, there is no problem because the nylon pipe has a high heat-resistant temperature, but the polyethylene pipe has a low heat-resistant temperature, so that the polyethylene pipe is crushed by the above method. Therefore, generally, a crosslinked polyethylene pipe having relatively high heat resistance is used, and further, a method in which asphalt at 170 to 180 ° C. is cooled to about 100 ° C. and driven in, or a crosslinked polyethylene pipe is buried in concrete. After that, after the concrete is sufficiently solidified, a method of laying asphalt on the concrete has been adopted. The heat circulation pipe constructed in this way is
When snow falls, a heat medium such as hot water is allowed to flow through the heat medium circulation pipe to melt the snow.

[0005]

However, when snow falls, a snow melting agent is usually sprayed in many cases. Then
Crosslinked polyethylene pipes are excellent in chemical resistance and are suitable without being attacked by a snow melting agent (mainly calcium chloride solution) sprayed on the asphalt surface. Nylon pipes are chemically resistant. To be inferior
Affected by snow melting agent spraying on the asphalt surface,
There is a problem that a hole is opened and the heat medium passing through the nylon pipe leaks from the hole.

On the other hand, crosslinked polyethylene pipes have a low heat-resistant temperature at the time of construction as described above.
80 ° C asphalt is cooled to 100 ° C,
Since the temperature of 100 ° C. is the lowest temperature when asphalt is applied, if the temperature is slightly lowered, it becomes impossible to execute the asphalt. Therefore, there is a problem that it is difficult to control the temperature.

[0007] Nylon pipes have a high heat-resistant temperature, so that it is not necessary to cool the asphalt and the construction is easy. However, when asphalt having a high temperature of 170 to 180 ° C is driven, asphalt is expanded and contracted by the nylon pipes. Cracks often occur, and as described above, there are many problems that the snow melting agent penetrates through the cracks and attacks the nylon pipe. Therefore, an object of the present invention is to provide a heat medium circulation pipe which is hardly affected by a snow melting agent and has good workability.

[0008]

Means for Solving the Problems The present invention has been made to achieve the above object, and the invention according to claim 1 comprises an outer layer of a heat-resistant synthetic resin and an inner layer of a chemical-resistant synthetic resin. , And an adhesive layer provided between the outer layer and the inner layer.

The invention according to claim 2 comprises an outer layer of a heat-resistant synthetic resin, an inner layer of a chemical-resistant synthetic resin, and an adhesive-adhered carbon fiber provided between the outer layer and the inner layer. The agent-attached carbon fiber is provided along the longitudinal direction.

The invention according to claim 3 comprises an outer layer of a heat-resistant synthetic resin, an inner layer of a chemical-resistant synthetic resin, and an adhesive-adhering reinforcing wire provided between the outer layer and the inner layer. The adhesive bonding wire is provided spirally in the circumferential direction.

According to a fourth aspect of the present invention, in the first to third aspects of the present invention, the outer layer has an outer circumferential surface provided with ridges and valleys in a circumferential direction.

According to a fifth aspect of the present invention, the uneven strip according to the fourth aspect of the present invention is provided on the outer peripheral surface in an annular shape in the circumferential direction, and has a gentle arc-shaped surface.

According to a sixth aspect of the present invention, the uneven strip according to the fourth aspect of the present invention is provided on the outer peripheral surface in an annular shape in the circumferential direction and has a rectangular surface.

According to a seventh aspect of the present invention, in the first to third aspects of the present invention, the outer peripheral surface of the outer layer is a cylindrical smooth surface, and the inner peripheral surface of the inner layer is provided with unevenness in the axial direction. It is.

The heat-resistant synthetic resin in the present invention is a resin having a high heat-resistant temperature, and is preferably a nylon resin, a polycarbonate resin, an acetal resin, or the like. In particular, a nylon resin which has good adhesiveness and is hardly attacked by a calcium chloride solution is preferable.

The chemical-resistant synthetic resin in the present invention is a synthetic resin which is not attacked by a snow melting agent or the like, and is preferably a polyolefin resin such as a polyethylene resin or a polypropylene resin, or a cross-linked polyolefin resin. .

The adhesive layer in the present invention is a synthetic resin that adheres to both a heat-resistant synthetic resin and a chemical-resistant synthetic resin.
In general, heat-resistant synthetic resins often have high polarity, and chemical-resistant synthetic resins often have low polarity. Therefore, in order to adhere to both, a copolymer of a monomer having a large polarity and a monomer having a small polarity or a synthetic resin modified by introducing a polar group into a molecule having a small polarity is preferable. In particular, when the heat-resistant synthetic resin is a nylon resin and the chemical-resistant synthetic resin is polyethylene, a synthetic resin in which a polar group such as a carboxyl group is introduced into polyethylene is preferable.

(Function) According to the first aspect of the present invention, since an outer layer made of a heat-resistant synthetic resin, an inner layer made of a chemical-resistant synthetic resin, and an adhesive layer provided between the outer layer and the inner layer, the construction is performed. Even when the asphalt temperature is 170 to 180 ° C., the heat-resistant synthetic resin of the outer layer does not deform. Therefore, the asphalt can be used without cooling to 100 ° C.

Also, even if a snow-melting agent is sprayed on the surface of the asphalt and the heat-resistant synthetic resin of the outer layer is eroded by the snow-melting agent and cracks are formed, the chemical-resistant synthetic resin of the inner layer is not eroded. The liquid that passes through the inside does not leak. Moreover, the heat-resistant synthetic resin and the chemical-resistant synthetic resin are not peeled off due to the intermediate adhesive layer, and the pipe is a good one integrated.

According to the second aspect of the present invention, an outer layer of a heat-resistant synthetic resin, an inner layer of a chemical-resistant synthetic resin, and an adhesive-adhered carbon fiber provided between the outer layer and the inner layer. As in the invention described in Item 1, the heat-resistant synthetic resin of the outer layer and the inner layer and the chemical-resistant synthetic resin do not deform during construction and the snow-melting agent does not affect the chemical-resistant synthetic resin of the inner layer. The liquid passing through the inside of the pipe does not leak.

Further, the outer layer and the inner layer are firmly adhered to each other by the adhesive of the carbon fiber with an adhesive provided between the outer layer and the inner layer, and are not separated. And since this adhesive-attached carbon fiber is provided along the longitudinal direction, the dimensional change due to the heat change is reduced by the carbon fiber having a smaller thermal expansion than the synthetic resin. Even if the heat medium circulation pipe becomes hot by driving asphalt and then cooled,
Shrinkage due to this cooling is small, and cracks in asphalt are reduced.

According to the third aspect of the present invention, there are provided an outer layer made of a heat-resistant synthetic resin, an inner layer made of a chemical-resistant synthetic resin, and an adhesive-adhering reinforcing wire provided between the outer layer and the inner layer. As in the first aspect of the present invention, the outer layer and the inner layer are not deformed during construction by the heat-resistant synthetic resin and the chemical-resistant synthetic resin, and the inner layer is not affected by the snow-melting agent. The liquid passing through the circulation pipe does not leak.

Further, the outer layer and the inner layer are firmly adhered by the adhesive of the adhesive-attached wire provided between the outer layer and the inner layer, and are not separated. Since the adhesive-attached wire is spirally provided in the circumferential direction, the compressive strength of the pipe is improved by the wire in the circumferential direction, and the pipe is not crushed by the rolling pressure of the roller at the time of construction. Further, since the wire is provided in a spiral shape, the flexibility of the pipe is not impaired, and therefore, there is no obstacle in laying the heat medium circulation pipe.

According to the fourth aspect of the present invention, the outer layer is provided with the ridges and protrusions in the circumferential direction on the outer peripheral surface. The collapse of the pipe due to the compaction of the pipe is eliminated. or,
The surface area increases due to the uneven stripes, and the heat of the heat medium passing through the pipe is easily radiated to the outside, so that the snow melting effect is improved. In addition, the flexibility of the pipe is improved, so that the heat medium circulation pipe is easily laid.

According to the fifth aspect of the present invention, the concave and convex strips according to the fourth aspect of the present invention are provided on the outer peripheral surface in an annular shape in the circumferential direction and have a gentle arc-shaped surface. A pair of endless belts having the same shape as the half circumference of the uneven strips attached to the surface of the synthetic resin from both sides can be manufactured simply by pressing from both sides, and therefore easy to manufacture.

According to the sixth aspect of the present invention, since the concavo-convex strip according to the fourth aspect of the present invention is provided on the outer peripheral surface in a circular shape in the circumferential direction and has a square surface, the synthetic resin extruded from the extruder is provided. It can be manufactured simply by pressing a pair of endless belts on both sides of which the same shape as the half circumference of the uneven strip is attached from both sides.

According to the seventh aspect of the present invention, since the outer surface of the outer layer is a cylindrical smooth surface, and the inner surface of the inner layer is provided with unevenness in the axial direction, the inner surface is resistant to unevenness. The compressive strength is improved, the pipe is not crushed by the rolling pressure of the roller at the time of construction, and the connection is easy with a joint because the outer peripheral surface is a cylindrical smooth surface.

[0028]

Next, an embodiment of the present invention will be described. (Embodiment 1) FIGS. 1 and 2 show an embodiment in which the present invention is used for melting snow. FIG. 1 is a perspective view of a heat medium circulation pipe, and FIG. 2 shows a use state of the heat medium circulation pipe. Things
(A) is a plan view showing a state in which a heat medium circulation pipe is laid on an iron wire, and (B) is a cross-sectional view showing a state in which the heat medium circulation pipe has been laid.

1 and 2, reference numeral 1 denotes a heat medium circulating pipe. The heat medium circulating pipe 1 has an outer layer 2, an inner layer 3, and an adhesive layer provided between the outer layer 2 and the inner layer 3. 4
Consists of The outer layer 2 is a heat-resistant nylon synthetic resin layer. The inner layer 3 is a chemical-resistant synthetic resin layer made of a cross-linked polyethylene resin.

The adhesive layer 4 is a resin layer in which a polar group such as a carboxyl group is introduced into polyethylene. The adhesive layer 4 firmly adheres to the outer layer 2 and the inner layer 3.
Therefore, since the adhesive layer 4 is provided, the outer layer 2 and the inner layer 3 are not separated from each other, and an excellent pipe is formed integrally. 4 is a basic roadbed. 5 is a cement concrete layer.

Reference numeral 6 denotes a grid-like iron wire, and the spacing between the grids of the grid-like iron wire 6 varies depending on the size of the heat medium circulation pipe 1 to be used. For example, if the inner diameter of the heat medium circulation pipe 1 is 1
In the case of 3 mm, an interval of 150 mm is preferable, and 16
In the case of mm, an interval of 200 mm is preferable. 7 is an asphalt layer, and the thickness of the asphalt layer is 50 m
m. 8 is an asphalt finish layer. The thickness of the asphalt finish layer 8 varies depending on the purpose of use. That is, the roads where vehicles pass well are thick, and the roads where vehicles do not pass much are thin. And usually, 30mm ~ 2
00 mm is preferred.

Next, the construction method and operation of the heat medium circulation pipe 1 will be described. Concrete is poured on the foundation roadbed 4 and solidified to form a concrete layer 5. Thereafter, a grid-shaped iron wire 6 is provided on the road surface, and a heating medium circulation pipe 1 is provided thereon, as shown in FIG. 2A, and the heating medium circulation pipe 1 is connected to the grid-shaped iron wire 6 with a thin wire.
Fixed to.

Next, asphalt heated to 170 to 180 ° C. is driven into the road surface while cooling water such as water is passed through the heat medium circulation pipe 1, and the road is flattened. By cooling, an asphalt layer 7 having a thickness of 50 mm is formed. Even if the asphalt heated to 170 to 180 ° C. is implanted, the heat-resistant synthetic resin of the outer layer 2 does not deform. Therefore, it is not necessary to cool the asphalt almost exactly to 100 ° C., and the construction is extremely simple. Next, 30 mm to 200 m according to the purpose of use
m of asphalt finish layer 8 is provided.

When snow falls on the road on which the heat medium circulating pipe 1 is laid in this way, the snow melting agent is sprayed on the asphalt-finished layer 8 and at the same time hot water is poured into the heat medium circulating pipe 1 as shown in FIG. B) Pass through from X to Y direction. Then, even if the heat-resistant synthetic resin of the outer layer 2 is attacked and cracked by the snow melting agent sprayed on the asphalt finish layer 8, the chemical-resistant synthetic resin of the inner layer 3 is not affected. Therefore, the hot water passing through the heat medium circulation pipe 1 does not leak, and can be used for a long period of time.

(Embodiment 2) FIG. 3 shows another embodiment in which the present invention is used for melting snow, and is a partially cutaway perspective view of a heat medium circulation pipe.

The second embodiment differs from the first embodiment shown in FIGS. 1 and 2 in that the heat medium circulation pipe 1a is different. The other points are almost the same as those in the first embodiment. Therefore, the structure of the heat medium circulation pipe 1a will be described, and other structures will be omitted. 1a
Is a heat medium circulation pipe, and this heat medium circulation pipe 1a
It comprises an outer layer 2a, an inner layer 3a, and an adhesive-adhered carbon fiber 4a provided between the outer layer 2a and the inner layer 3a. The outer layer 2a and the inner layer 3a are the same as in the first embodiment.

The adhesive-attached carbon fiber 4a is obtained by adhering an adhesive mainly composed of a resin obtained by introducing a polar group such as a carboxyl group into polyethylene onto the surface of the carbon fiber. Are provided along the longitudinal direction. The outer layer 2a and the inner layer 3 are formed by the adhesive attached to the carbon fiber.
a is firmly adhered to each other, and as a result, the outer layer 2a and the inner layer 3a are not peeled off from each other, so that a good pipe is integrated.

Next, the construction method and operation of the heat medium circulation pipe 1a will be described. Concrete is poured over the foundation roadbed and solidified to form a concrete layer. Thereafter, a grid-like iron wire is provided on the road surface, and a heat medium circulating pipe 1a is provided thereon, and the heat medium circulating pipe 1a is fixed to the grid-like iron wire with a thin wire.

Next, asphalt heated to 170 to 180 ° C. is driven into the road surface while cooling water such as water is passed through the heat medium circulating pipe 1 a, and is flattened. After cooling, an asphalt layer having a thickness of 50 mm is formed. Even if the asphalt heated to 170 to 180 ° C. is implanted in this way, the heat-resistant synthetic resin of the outer layer 2a is not deformed, so that it is not necessary to cool the asphalt almost exactly to 100 ° C., and the construction is extremely simple. Next, 30 mm to 200 m according to the purpose of use
m asphalt finish layer.

When snow falls on the road on which the heat medium circulating pipe 1a is laid in this way, hot water is passed through the heat medium circulating pipe 1a at the same time as spraying the snow melting agent on the asphalt finish layer. Then, even if the heat-resistant synthetic resin of the outer layer 2a is attacked and cracked by the snow-melting agent sprayed on the asphalt-finished layer, the chemical-resistant synthetic resin of the inner layer 3a is not attacked. The hot water passing through the inside of 1a is not leaked, can be used for a long time, and the replacement cost is reduced, which is convenient.

The carbon fiber 4 with the adhesive attached thereto
Since a is provided along the longitudinal direction, the dimensional accuracy is improved by the carbon fiber having a smaller thermal expansion than that of the synthetic resin.
Even if the heat medium circulation pipe 1a is heated to a high temperature by asphalt at ℃ and then cooled, the shrinkage due to this cooling is small and asphalt cracking is reduced, so that the outer layer 2a
Therefore, the amount of the snow melting agent penetrating into the outer layer 2a decreases, and the crack in the outer layer 2a decreases.

(Embodiment 3) FIGS. 4A and 4B show another embodiment in which the present invention is used for melting snow. FIG. 4A is a partially cutaway perspective view of a heat medium circulation pipe, and FIG. It is explanatory drawing which shows the cross section in the AA line.

The third embodiment differs from the first embodiment shown in FIGS. 1 and 2 in that the heat medium circulation pipe 1b is different. The other points are almost the same as those in the first embodiment. Therefore, the structure of the heat medium circulation pipe 1b will be described, and other structures will be omitted. 1b
Is a heat medium circulation pipe, and this heat medium circulation pipe 1b is
It comprises an outer layer 2b, an inner layer 3b, and an adhesive bonding wire 4b provided between the outer layer 2b and the inner layer 3b. The outer layer 2b and the inner layer 3b are the same as in the first embodiment.

The adhesive bonding wire 4b is attached to the surface of the iron wire,
An adhesive containing, as a main component, a resin in which a polar group such as a carboxyl group is introduced into polyethylene.
This adhesive-attached wire is provided spirally in the circumferential direction. The outer layer 2b and the inner layer 3b are firmly adhered to each other by the adhesive attached to the wire, and as a result, the outer layer 2b and the inner layer 3
b is a good pipe integrated without being peeled off.

Next, the construction method and operation of the heat medium circulation pipe 1b will be described. Concrete is poured over the foundation roadbed and solidified to form a concrete layer. After that, a grid-like iron wire is provided on the road surface, and on top of this,
A heat medium circulation pipe 1b is provided.
Is fixed to a grid-like iron wire with a thin wire.

Next, asphalt heated to 170 to 180 ° C. is driven into the road surface while cooling water such as water is passed through the heat medium circulation pipe 1b, and is flattened. After cooling, an asphalt layer having a thickness of 50 mm is formed. Even if the asphalt heated to 170 to 180 ° C. is implanted in this way, the heat-resistant synthetic resin of the outer layer 2a is not deformed.
There is no need to cool to 0 ° C, and construction is extremely simple.

Further, the compressive strength of the pipe is improved by the adhesive adhering wire 4b spirally provided in the circumferential direction, and the pipe is not crushed by the rolling pressure of the roller at the time of construction. In addition, since the adhesive-attached wire 4b is provided in a spiral shape, the flexibility of the pipe is not impaired, and therefore does not hinder the laying of the heat medium circulation pipe. Next, an asphalt finish layer of 30 mm to 200 mm is provided according to the purpose of use.

When snow falls on the road on which the heat medium circulating pipe 1b is laid in this way, hot water is passed through the heat medium circulating pipe 1b while simultaneously spraying a snow melting agent on the asphalt-finished layer. Then, even if the heat-resistant synthetic resin of the outer layer 2b is attacked and cracked by the snow-melting agent sprayed on the asphalt-finished layer, the chemical-resistant synthetic resin of the inner layer 3b is not attacked. The hot water passing through the inside of 1b is not leaked, can be used for a long time, and the replacement cost is reduced, which is convenient.

(Embodiment 4) FIGS. 5A and 5B show still another embodiment in which the present invention is used for melting snow. FIG. 5A is an explanatory view showing a part of a front surface of a heat medium circulation pipe, and FIG. It is explanatory drawing which shows the side surface of a heat medium circulation pipe.

The fourth embodiment differs from the first embodiment shown in FIGS. 1 and 2 in that the heat medium circulation pipe 1c is different. The other configuration is almost the same as that of the first embodiment. Therefore, the structure of the heat medium circulation pipe 1c will be described, and other structures will be omitted. 1c
Is a heat medium circulation pipe, and this heat medium circulation pipe 1c
It comprises an outer layer 2c, an inner layer 3b, and an adhesive layer 4c provided between the outer layer 2c and the inner layer 3c.

The outer layer 2c is a heat-resistant synthetic resin of nylon. The outer peripheral surface of the outer layer 2c is provided with an uneven strip 21c in the circumferential direction. The concave and convex strips 21c are provided on the outer peripheral surface in an annular shape in the circumferential direction, and have a gentle arc-shaped surface.

Since the ridges 21c are provided on the outer peripheral surface in a ring shape in the circumferential direction and have a gentle arc-shaped surface, the surface of the synthetic resin extruded from the extruder has a half circumference of the ridges from both sides. It can be manufactured simply by pressing a pair of endless belts to which substantially the same mold is attached from both sides, and therefore, it is easy to manufacture. The inner layer 3c and the adhesive layer 4c are the same as those of the first embodiment.
Is the same as

Next, the construction method and operation of the heat medium circulation pipe 1c will be described. Concrete is poured over the foundation roadbed and solidified to form a concrete layer. After that, a grid-like iron wire is provided on the road surface, and on top of this,
A heat medium circulation pipe 1c is provided.
Is fixed to a grid-like iron wire with a thin wire. At this time, since the flexibility of the pipe is improved by the circumferential unevenness 21c provided on the outer peripheral surface, the pipe is easily curved and laid on the iron wire.

Next, asphalt heated to 170 to 180 ° C. is driven into the heating medium circulation pipe 1c while cooling water such as water is passed through the pipe, and after being flattened, it is rolled by rollers and naturally cooled. To form an asphalt layer having a thickness of 50 mm. Even if the asphalt heated to 170 to 180 ° C. is driven in this way, the heat-resistant synthetic resin of the outer layer 2c is not deformed, so that it is not necessary to cool the asphalt to 100 ° C., and the construction is extremely simple.

Further, since the compressive strength of the pipe is improved by the circumferential unevenness 21c provided on the outer peripheral surface, the heat medium circulation pipe 1c is not crushed by the rolling pressure of the roller. You can feel safe. Next, an asphalt finish layer of 30 mm to 200 mm is provided according to the purpose of use.

When snow falls on the road on which the heat medium circulating pipe 1c is laid in this way, hot water is passed through the heat medium circulating pipe 1c while spraying the snow melting agent on the asphalt finish layer. Then, even if the heat-resistant synthetic resin of the outer layer 2c is attacked and cracked by the snow-melting agent sprayed on the asphalt-finished layer, the chemical-resistant synthetic resin of the inner layer 3c is not attacked. The hot water passing through the inside of 1c is not leaked, can be used for a long time, and the replacement cost is reduced, which is convenient. In addition, the circumferential unevenness 21c provided on the outer peripheral surface increases the surface area, facilitates the heat of the heat medium passing through the pipe to be radiated to the outside, and improves the snow melting effect.

(Embodiment 5) FIGS. 6A and 6B show still another embodiment in which the present invention is used for snow melting. (A) Explanatory drawing showing a part of the front surface of a heat medium circulation pipe. It is explanatory drawing which shows the side surface of a heat medium circulation pipe.

The fifth embodiment is different from the fourth embodiment shown in FIG. 5 in that the uneven ridges 21d are provided on the outer peripheral surface in an annular shape in the circumferential direction and have a square surface. The function of the ridges 21d is almost the same as that of the fourth embodiment shown in FIG. The other structures, usage methods, and operations are almost the same, and thus description thereof is omitted.

(Embodiment 6) FIG. 7 shows still another embodiment in which the present invention is used for melting snow, and is a perspective view of a heat medium circulation pipe.

The sixth embodiment differs from the first embodiment shown in FIGS. 1 and 2 in that the heat medium circulation pipe 1e is different. The other configuration is almost the same as that of the first embodiment. Therefore, the structure of the heat medium circulation pipe 1e will be described, and other structures will be omitted. 1e
Is a heat medium circulation pipe, and this heat medium circulation pipe 1e
It comprises an outer layer 2e, an inner layer 3e, and an adhesive layer 4e provided between the outer layer 2e and the inner layer 3e.

The outer layer 2e is a layer of a heat-resistant synthetic resin of nylon. The outer peripheral surface of the outer layer 2e is cylindrical and smooth. As described above, since the outer peripheral surface is a cylindrical smooth surface, it is easy to connect with the joint. The inner layer 3e is a layer of a chemical resistant synthetic resin made of a crosslinked polyethylene resin.

The inner circumferential surface of the inner layer 3e is provided with an uneven strip 31e in the axial direction. Thus, the outer layer 2
Since the outer peripheral surface of e is a cylindrical smooth surface, and the inner peripheral surface of the inner layer 3e is provided with the ridges 31e in the axial direction, the compressive strength is improved by the ridges 31e on the inner peripheral surface. The adhesive layer 4e is the same as in the first embodiment.

Next, the construction method and operation of the heat medium circulation pipe 1e will be described. Concrete is poured over the foundation roadbed and solidified to form a concrete layer. After that, a grid-like iron wire is provided on the road surface, and on top of this,
A heat medium circulating pipe 1e is provided.
Is fixed to a grid-like iron wire with a thin wire.

Next, asphalt heated to 170 to 180 ° C. is driven into the heat medium circulating pipe 1 e while cooling water such as water is passed through the pipe, and is flattened. To form an asphalt layer having a thickness of 50 mm. Even if the asphalt heated to 170 to 180 ° C. is driven in this way, the heat-resistant synthetic resin of the outer layer 2e is not deformed, and therefore, it is not necessary to cool the asphalt to 100 ° C., and the construction can be performed very easily.

Since the compressive strength is improved by the concave and convex strips 31e on the inner peripheral surface of the inner layer 3e provided on the outer peripheral surface, the pipe is not crushed even if it is rolled by a roller.
Next, an asphalt finish layer of 30 mm to 200 mm is provided according to the purpose of use.

When snow falls on the road on which the heat medium circulating pipe 1e is laid in this way, hot water is passed through the heat medium circulating pipe 1e while spraying the snow melting agent on the asphalt finish layer. Then, even if the heat-resistant synthetic resin of the outer layer 2e is attacked and cracked by the snow-melting agent sprayed on the asphalt-finished layer, the chemical-resistant synthetic resin of the inner layer 3e is not attacked. The hot water passing through the inside of 1e is not leaked, can be used for a long time, and the replacement cost is reduced, which is convenient.

[0067]

According to the first aspect of the present invention, an outer layer made of a heat-resistant synthetic resin, an inner layer made of a chemical-resistant synthetic resin, and an adhesive layer provided between the outer layer and the inner layer are provided. Asphalt heated to 170-180 ° C can be used,
Extremely easy to construct.

Further, even if a snow-melting agent is sprayed on the surface of asphalt and the heat-resistant synthetic resin of the outer layer is eroded and cracked by the snow-melting agent, the chemical-resistant synthetic resin of the inner layer is not eroded. The liquid passing through the inside of the device is not leaked, can be used for a long time, and the replacement cost is reduced, which is convenient. Also, because of the intermediate adhesive layer, the heat-resistant synthetic resin and the chemical-resistant synthetic resin do not come off,
It is a good integrated pipe.

According to the second aspect of the present invention, the outer layer is made of a heat-resistant synthetic resin, the inner layer is made of a chemical-resistant synthetic resin, and the carbon fiber with an adhesive is provided between the outer layer and the inner layer. Similar to the invention described in Item 1, since the outer layer and the inner layer are easily deformed without being deformed at the time of construction by the heat-resistant synthetic resin and the chemical-resistant synthetic resin, and the chemical-resistant synthetic resin of the inner layer is not affected by the snow melting agent. Since the liquid passing through the heat medium circulation pipe does not leak, it can be used for a long period of time and the replacement cost is reduced, which is convenient.

Further, the outer layer and the inner layer are firmly adhered to each other by the adhesive of the carbon fiber with an adhesive provided between the outer layer and the inner layer, and are not separated. Also, since this adhesive-attached carbon fiber is provided along the longitudinal direction,
Carbon fiber, which has a smaller thermal expansion than synthetic resin, can be used for a long time with less cracking of asphalt at the time of construction, and the replacement cost is reduced, which is convenient.

According to the third aspect of the present invention, the outer layer is made of a heat-resistant synthetic resin, the inner layer is made of a chemical-resistant synthetic resin, and the wire for bonding and reinforcing the adhesive is provided between the outer layer and the inner layer. Similar to the first aspect of the present invention, the heat-resistant synthetic resin and the chemical-resistant synthetic resin of the outer layer and the inner layer are easily deformed without being deformed at the time of application, and the chemical-resistant synthetic resin of the inner layer is not affected by the snow melting agent. Therefore, the liquid passing through the heat medium circulating pipe does not leak, so that it can be used for a long period of time, and the cost of replacement is reduced, which is convenient.

Further, the outer layer and the inner layer are firmly adhered by the adhesive of the adhesive-attached wire provided between the outer layer and the inner layer and are not separated. In addition, since the adhesive-attached wire is spirally provided in the circumferential direction, the pipe is not crushed by the rolling pressure of the roller at the time of construction, and the flexibility of the pipe is not impaired. It is convenient because it does not hinder the installation of the heat medium circulation pipe.

According to the fourth aspect of the present invention, since the outer layer is provided with the ridges and protrusions in the circumferential direction on the outer peripheral surface, the collapse of the pipe due to the rolling pressure of the roller at the time of construction is eliminated, and the pipe passes through the pipe. This is convenient because the heat of the heat medium is easily radiated to the outside and the snow melting effect is improved. In addition, the flexibility of the pipe is improved, so that the heat medium circulation pipe is easily laid.

According to the fifth aspect of the present invention, since the uneven strip according to the fourth aspect is provided on the outer peripheral surface in a circular shape in the circumferential direction and has a gentle arc-shaped surface, it is easy to manufacture.

According to the sixth aspect of the present invention, since the uneven strip according to the fourth aspect of the present invention is provided on the outer peripheral surface in an annular shape in the circumferential direction and has a square surface, it is easy to manufacture.

In the invention according to claim 7, since the outer surface of the outer layer is a cylindrical smooth surface and the inner surface of the inner layer is provided with unevenness in the axial direction, the pipe is formed by rolling of the roller at the time of construction. And the outer peripheral surface is a cylindrical smooth surface, which facilitates connection with a joint and is convenient.

[Brief description of the drawings]

FIG. 1 is a perspective view of a heat medium circulating pipe, showing an embodiment in which the present invention is used for melting snow.

FIG. 2 shows a use state of a heat medium circulation pipe,
(A) is a plan view showing a state in which a heat medium circulation pipe is laid on an iron wire, and (B) is a cross-sectional view showing a state in which the heat medium circulation pipe has been laid.

FIG. 3 is a partially cutaway perspective view of a heat medium circulation pipe showing another embodiment in which the present invention is used for melting snow.

FIG. 4 shows another embodiment in which the present invention is used for snow melting, in which (a) a partially cutaway perspective view of a heat medium circulation pipe, and (b).
FIG. 4 is an explanatory view showing a cross section taken along line AA of FIG.

FIGS. 5A and 5B show still another embodiment in which the present invention is used for melting snow; (a) an explanatory view showing a part of a front surface of a heat medium circulating pipe; FIG.

FIG. 6 is a view showing still another embodiment in which the present invention is used for melting snow; (a) an explanatory view showing a part of a front surface of a heat medium circulating pipe; FIG.

FIG. 7 is a perspective view of a heat medium circulation pipe, showing still another embodiment in which the present invention is used for melting snow.

[Explanation of symbols]

1, 1a, 1b, 1c, 1e Heat medium circulation pipe 2, 2a, 2b, 2c, 2e Outer layer 21c, 21d Rough 3,3a, 3b, 3c, 3e Inner layer 31e Rough 4,4c, 4e Adhesive layer 4a Adhesion Adhesive-attached carbon fiber 4b Adhesive-attached wire

Claims (7)

[Claims] 1. A heat medium circulation pipe comprising an outer layer of a heat-resistant synthetic resin, an inner layer of a chemical-resistant synthetic resin, and an adhesive layer provided between the outer layer and the inner layer. 2. An outer layer of a heat-resistant synthetic resin, an inner layer of a chemical-resistant synthetic resin, and an adhesive-attached carbon fiber provided between the outer layer and the inner layer. A heat medium circulation pipe, which is provided along a direction. 3. An outer layer of a heat-resistant synthetic resin, an inner layer of a chemical-resistant synthetic resin, and an adhesive-adhering reinforcing wire provided between the outer layer and the inner layer. A heat medium circulation pipe, which is provided in a spiral shape in a circumferential direction. 4. The heat medium circulating pipe according to claim 1, wherein the outer layer is provided with irregularities in the circumferential direction on an outer peripheral surface of the outer layer. 5. The heat medium circulation pipe according to claim 4, wherein the concave and convex strips are provided on the outer peripheral surface in an annular shape in the circumferential direction, and have a gentle arc-shaped surface. 6. The heat medium circulation pipe according to claim 4, wherein the concave and convex strips are provided on the outer peripheral surface in an annular shape in a circumferential direction and have a rectangular surface. 7. The heat medium circulating pipe according to claim 1, wherein an outer peripheral surface of the outer layer is a cylindrical smooth surface, and irregularities are provided in the inner peripheral surface of the inner layer in an axial direction.