JP2000230722A - Heatable flooring work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate heatable flooring work by passing a heat carrier through a heat carrier tube, widening the heat carrier tube exposed while shifting the other end side of an end member and arranging a linear plate in the vicinity of final row thereby obtaining a foldable flooring material which can be manufactured easily. SOLUTION: Two sheets of end member 11 laminating soaking materials embedded with a heat carrier tube 12 are stopped temporarily to a stretched underlying floor plywood while exposing a plurality of heat carrier tubes 12 perpendicularly to the longitudinal direction of the end member 11. The plurality of heat carrier tubes 12 exposed between two sheets of end member 11 are then filled collectively in a plurality of parallel grooves 13, 13 in the rear surface of a first linear plate on the heat carrier tubes 12 after adjusting the interval. Similarly, the heat carrier tubes 12 are filled in the second and subsequent linear plates and heated heat carrier is passed through the heat carrier tubes 12. The end member 11 is then shifted on the other end side and the exposed heat carrier tubes 12 are widened before arranging the linear plates at the final row and the vicinity thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a heatable floor. In more detail, it is installed on the surface of the base material of buildings such as ordinary houses, apartment houses, commercial buildings or hotels, it can be folded, and it has a heatable floor that is easy to pack, store, transport, construction work etc. Concerning the construction method.

[0002]

2. Description of the Related Art Conventionally, floor heating technology for heating from the floor of a house has been proposed and put into practical use for the purpose of improving the livability of a house in a cold region and the livability of a house in a warm region in a cold season. . For example, in single-family homes, a method of incorporating a floor heating radiator plate (also called a panel) on the upper surface (or upper side) of the underlaying plywood laid between the large pulley and the floorboard or on the large pulley is adopted. In multi-family houses such as condominiums, a method of laying a floor heating radiator plate directly on the upper surface of the slab floor or on the upper surface of lower plywood laid on the upper surface of the slab floor is adopted. .

A radiating plate (panel) for floor heating is disclosed in, for example, JP-A-60-223922 and JP-A-3-17521.
No. 6, JP-A-4-80596, JP-A-8-2
As described in Japanese Patent No. 61485, a groove or space is formed on one upper surface of a plate made of a soft foam or a hard foam, and a flexible tube for a heat medium ( Hereinafter, simply “tube for heat medium” or “tube”
), And the surface thereof is covered with a soaking material such as aluminum foil.

[0004] These conventionally known heat radiating plates (panels) include a tube for a heat medium in a narrow and long plate-like body, and in a groove or space formed along the length direction of the plate-like body. It was common to bury it. When laying a heat sink having such a structure, in many cases, a method of assembling a heat sink in a wide area in advance in a factory and carrying it to a laying site and laying it is adopted. However, according to this conventional method, the heat dissipating plate assembled to a wide width folds the heat medium tube when folded,
There is a drawback that the groove engraved on the plate-like body is broken.

[0005] The buckling of the tube for the heat medium and the breakage of the groove formed in the plate-like body are caused by the fact that the tube for the heat medium is formed from one narrow and long plate-like body adjacent to another. Paying attention to the fact that it frequently occurs at the end of the plate that communicates with the plate, we examined ways to solve these defects and proposed a heat sink with a structure that allows the end of the plate to be attached and removed. (Japanese Patent Application No. 8-240255). However, as a result of further study, it was found that the heat sink having the structure proposed above could solve the above-mentioned drawbacks, but still had a drawback that the manufacturing work and the laying work were complicated.

[0006]

SUMMARY OF THE INVENTION The present inventors have previously described
Easy to manufacture, foldable, easy to lay on the construction site without buckling of the heat medium tube during packing, storage, transportation and laying, and without breaking the groove cut in the plate-like body As a result of intensive studies to provide a radiating plate (panel) for floor heating that can be made, both ends in the width direction of the radiating plate are formed of a plurality of narrow and long flat plates. A heat medium tube is buried in the engraved curved groove in advance so that the heat medium tube does not come off from the curved groove, and between both ends in the width direction, the heat medium tube is arranged at right angles to the length direction. By arranging a narrow and long linear flat plate in which a groove is formed, it has been found that the problem can be solved at once, and a heat radiating plate having a structure has been proposed (Japanese Patent Application No. 10-54883).

However, as a result of further study, the heat sink having the structure proposed above was able to solve the drawbacks such as buckling of the tube for the heat medium and breakage of the groove formed in the plate-like body. It has been found that problems such as a shortage of gaps for arranging the last row of plate-like bodies during construction are found. For this reason, as a result of intensive studies for the purpose of providing a construction method in which there is no shortage of gaps for disposing the last row of plate bodies during construction, the present invention has been completed. The objects of the present invention are as follows. 1. Easy to manufacture, foldable, easy to lay on the construction site without buckling the heat transfer tube or breaking the groove cut in the flat plate when packing, storing, transporting and laying To provide a method of constructing a heatable floor that can perform heating. 2. An object of the present invention is to provide a construction method in which a gap for arranging the last row of plate-like bodies is not insufficient when the above-mentioned heatable floor is constructed.

[0008]

In order to solve the above-mentioned problems, according to the present invention, there is provided an end member (A) having a substantially square planar shape forming opposing ends, and an opposing end member (A). In constructing a floor that can be heated by a plurality of narrow and long linear flat plates (B) arranged between the two and has a substantially square planar shape and can be heated by a heatable floor construction member, The opposite ends of the end member (A) are positioned at a predetermined position with the surface on which the heat medium tubes are buried positioned below and the exposed plurality of heat medium tubes at right angles to the both ends. Then, a linear flat plate (B) is placed from above on a plurality of heat medium tubes exposed between both ends of the end member (A).
Are sequentially arranged from one end side to the other end side of the end member (A), and when the final row and the linear flat plate (B) in the vicinity of the last row are arranged, the heat medium that has been heated is passed through the heat medium tube. A method for constructing a heatable floor, characterized in that the heat medium tube portion exposed by displacing the other end of the component member (A) is widened and a linear flat plate (B) near the last row is arranged. I will provide a.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
The member for building a heatable floor used in the method of the present invention comprises:
After the construction, a wide and long rectangular heat radiating plate (panel) for floor heating is formed, and end members (A) constituting both ends of the square (hereinafter, simply referred to as “end members (A)”) ) And a narrow and long linear flat plate (B) (hereinafter sometimes referred to as a “linearly arranged member”) disposed between the end members. The end member is composed of one to five narrow and long rectangular flat plates,
A heat medium tube that is disposed between the opposing end members at a substantially right angle to the longitudinal direction of the end members is curved at these end members, and the end members opposing at a constant interval. Performs the function of returning to the side.

The end member (A) is made of one to five flat plates having a narrow width and a length of a rectangular plate, and the ends in the length direction are brought into contact with each other to be integrated to have a constant width. It is preferable to attach a surface covering material to the ()) side. A curved groove is engraved on the other surface (back surface) of the end member, and a heat medium tube is buried in the engraved curved groove, and the entire back surface of the end member is lined so as not to come off from the curved groove. Paste the material. The width of the end member (A) can be selected in the range of 10 to 100 cm. When the width is more than 100 cm, workability such as folding, packing, storage, and transportation is inferior. When the width is less than 10 cm, a curved groove for changing the direction of the heat medium tube cannot be formed. Note that the curved groove is a groove that receives the heat medium tube from the end on the side of the linear arrangement member and draws an arc or a changed arc to change the direction.

The narrow and long rectangular flat plate is preferably selected from wood board, plywood, particle board, fiber board, synthetic resin board and the like. In the case of a synthetic resin plate, it is preferable to select from among hard foamed resin flat plates having closed cells and excellent rigidity. Specific examples include expanded polystyrene, a mixture of expanded polystyrene and expanded polyethylene, expanded polypropylene, hard polyurethane, expanded hard rubber, and the like, but are not limited thereto. When the flat plate is a synthetic resin plate, wooden joists can be arranged at regular intervals between the flat plates.

In the case of a synthetic resin plate, the expansion ratio of the flat plate is 2
Can be selected in the range of ~ 80 times, and the width of one flat plate is 5
The thickness of the flat plate can be selected to be as small as the diameter of the heat medium tube, and the maximum can be selected within the range of the heat medium tube diameter plus 15 mm. If the thickness of the flat plate is more than the diameter of the tube for the heat medium plus 15 mm or more, the flat plate becomes too thick, and the heat transfer from the tube for the heat medium to the facing material side deteriorates, which is not preferable. The length of the flat plate can be selected in the range of 60 to 400 cm.

[0013] The covering material imparts rigidity to the surface of the flat plate, protects the flat plate from being crushed or deformed,
It fulfills the function of improving the surface appearance. Specific examples of the facing material include a plywood, a wood board, a fiber board, a resin board, a particle board, and the like, but are not limited to these examples. The surface materials to be combined shall be selected according to the type of the flat plate. The surface material may be composed of one sheet or a combination of a plurality of thin small pieces. A paint may be applied to the surface of the facing material, or a wood grain pattern or another pattern may be printed. If the thickness of the surface covering material is too small, the above function cannot be exerted. If the thickness is too large, the efficiency of heat transfer from the heat medium tube is reduced. The thickness of the surface material is
It can be selected in the range of 1-3 mm.

The linearly arranged members (B) are arranged between the end members (A) previously laid at both ends of the construction site, and combined with the end members (A) to form a heatable floor. Perform the function of The linear arrangement member (B) has a structure in which a plurality of grooves for embedding (or fitting) a tube for a heat medium are formed at regular intervals on the back surface thereof at right angles to the length direction. When arranging the linear arrangement member (B) between the two end members (A), the plurality of heat medium tubes exposed between the end members (A) are connected to the linear arrangement member (B). It is buried in a plurality of grooves on the back. It is preferable that the linearly arranged member (B) is made of a flat plate made of the same hard foamed resin as the end member (A) and has the same thickness as the end member. Length is end member (A)
Or a different length. If the width of the linear arrangement member (B) is too large, folding, packing,
6-50cm because of poor workability such as storage, transportation and construction
It is preferable to select within the range.

A surface covering material is to be adhered to the surface of the linear arrangement member (B), and the type, thickness, pattern, etc. of the surface covering material are the same as the surface covering material to be adhered to the surface of the end member (A). And In addition, it is preferable to affix a soaking material made of metal foil such as aluminum foil to the back surface of the linear arrangement member (B). It is preferable that the soaking material is pressed down to the inner wall surface of the groove formed in the back surface and is attached. When the thickness of the heat equalizing material is too small, the strength is insufficient and the material tends to be damaged. On the other hand, when the thickness is too large, the cost becomes high. The preferred thickness of the soaking material is in the range of 10 to 200 μm. It is preferable to provide a structure in which a convex protrusion is provided on one side and a concave groove is provided on the other on the side surface in the length direction of the linear arrangement member (B), and the two are fitted when arranged.

The heat medium tube arranged on the back side of the end member (A) and the linear arrangement member (B) has a function of passing the heat medium into the inner space thereof, and is excellent in flexibility. It is also necessary to have excellent mechanical strength, heat resistance, chemical resistance and the like. Examples of tubes exhibiting such characteristics include crosslinked polyethylene tubes, polybutene tubes, polypropylene tubes, and resin tubes having a metal wire embedded in the wall of the tube. Among these, a crosslinked polyethylene tube and a polybutene tube are preferred. The diameter of the heat medium tube varies depending on the region where the building is constructed, the type of the building, and the like, but can be selected in the range of 5 to 17 mm.

A member in which the end member (A) having the above structure is combined with a heat medium tube, and a linearly arranged member (B)
Is manufactured in advance at a factory or the like different from the place where the heatable floor is constructed. In the member in which the end member (A) and the heat medium tube are combined, the portion of the heat medium tube that is covered by arranging the linear arrangement member (B) is exposed and does not buckle. It can be folded in such a way that the surface material is not damaged, and it is easy to handle such as storage and transportation to the construction site. Further, since the linearly arranged member (B) is not wide, it is possible to stack several sheets, and it is also easy to handle such as storage and transportation to a construction site.

Hereinafter, a method of constructing a floor that can be heated using the above structural members will be described. The above-mentioned building member is manufactured in advance in a factory or the like, and both the end member (A) and the linearly arranged member (B) are transported and carried into a construction site.
It is laid in place on the ground below the floor of the building. Underground refers to the slab surface in the case of concrete buildings such as condominiums, commercial buildings, hotels, etc., and the underlying floor plywood formed on these, and in the case of detached houses, the underlying floor plywood . Nonwoven fabric,
It is preferable to spread a rubber sheet or the above-mentioned metal foil soaking material. The predetermined position may be the entire floor of the room or a specific part of the floor of the room.

When constructing a floor which can be heated according to the method of the present invention, first, a tube for a heat medium is buried in the previously formed curved groove, and a tube for a heat medium is buried in the curved groove. And / or disposing the two end members (A) laminated with the backing material at the laying place and exposing a plurality of heat medium tubes at right angles to the length direction of the end members (A); And it is tensed and temporarily fastened to the ground floor plywood. Next, the interval between the plurality of heat medium tubes exposed between the two end members (A) is adjusted, and the plurality of heat medium tubes on the back surface of the first linear flat plate (B) from above are adjusted. At a stroke and arranged. Hereinafter, in the same procedure, the second and subsequent linear flat plates (B) are sequentially fitted and arranged from one end to the other end of the end member (A).

Then, when arranging the linear flat plate (B) near the last row, the other end of the end member (A) is shifted through the heat medium heated to the heat medium tube to expose the heat medium. The tube portion is widened, and the last row and the linear flat plate (B) in the vicinity thereof are arranged. Passing the heated heat medium through the heat medium tube causes thermal expansion, so that the width of the exposed heat medium tube portion where the second straight plate (B) is arranged from the last row or the last row can be widened. it can. After widening, the second flat plate from the last row and the last row (B)
Can be easily fitted and arranged.

It is preferable to provide a structure in which a tongue groove and a tongue groove are provided on opposing side surfaces of the linear arrangement member (B), or only the tongue groove is provided to be combined with a hiring tongue and groove. In addition, it can be fixed to the base floor plywood with a nail, or can be adhered to the base floor plywood with an adhesive. In addition, it is preferable to arrange | position the flat plate which does not embed the tube for heat medium in the position used as a storage place of furniture etc. near the wall surface of a room.

When constructing a heatable floor according to the method according to the invention, it is preferred to use a comb-like construction member (C). The comb-shaped construction member (C) (i) tensions a plurality of heat medium tubes exposed between the two temporarily fixed end members (A), and (ii) heat medium tubes. The distance between them is adjusted so as to accurately oppose the plurality of parallel grooves engraved on the back surface of the linear arrangement member (B), and (iii) the plurality of linear members (B) of the heat medium tube are arranged. Facilitate the work of fitting into the parallel groove, and (iv) raise the heat medium tube so that it does not come in contact with the base surface even if the surface of the base surface has been previously coated with an adhesive, etc. It functions so as to be able to slide and arrange the arranging member (B) to a predetermined position.

The comb-like construction member (C) is formed of a narrow and long plate-like body, and a plurality of guide grooves having a small depth are provided on one side in the width direction at regular intervals. A structure in which a plurality of guide grooves having a relatively large depth are provided on the side at a constant interval. When the heat medium tube exposed between the end member (A) and the linearly arranged member (B) is wider than about 100 cm, a relatively shallow guide groove is used.
When it is narrow at about 90 cm, it is preferable to use different grooves, for example, utilizing a relatively deep guide groove.

At least one end in the length direction of the comb-shaped construction member (C) may be cut into an acute angle in the shape of a blade, or at least one corner may be cut into an acute angle. (See FIG. 6 to be described later), and it is preferable that one of the corners of the sharply cut side is cut out like a knife or the like. Such a structure in which the blade is cut into a blade shape is preferable because the blade can be easily inserted between the lower ground surface such as the base floor plywood and the plurality of tubes for the heat medium from the sharp edge portion.

The comb-shaped construction member (C) can be manufactured from a wooden board, a plywood, a synthetic resin board, a metal board, a particle board, a fiber board and the like. The distance between the guide grooves can be selected at an interval of 3 to 20 cm in accordance with the distance between the tubes for the heat medium, and the depth of the guide grooves varies depending on the width of the construction member (C). The guide groove can be selected up to about 5 mm, and the relatively deep guide groove can be selected up to about 3 cm. There are no particular restrictions on the length, width, thickness, etc. of the comb-shaped construction member (C). The length is 45 to 200 cm, and the width is depending on the type of the place where the heating floor is constructed, the size of the place, and the like. The thickness can be selected within a range of 1 to 10 cm and a thickness of 3 to 20 mm. When the end member (A) is long and the number of exposed heat medium tubes is large, a plurality of long comb-shaped construction members (C) may be used in combination. If the room where the heating floor is to be constructed is small, a plurality of short comb-like construction members (C) can be used in combination.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings, but the present invention is not limited to the following description unless it exceeds the gist.

FIG. 1 is a plan view showing a state in which two end members are arranged so as to face each other, FIG. 2 is an enlarged longitudinal sectional end view taken along a line AA in FIG. 1, and FIG. FIG. 4 is a perspective view of a state in which the front sides of the two end members are overlapped and folded, and FIG.
It is a perspective view of a state where a plurality of linear arrangement members are stacked,
FIG. 5 is a perspective view showing an example of a method of constructing a floor that can be heated according to the present invention, and FIG. 6 is a side view of an example of a comb-like construction member according to the present invention.

In the example shown in FIGS. 1 and 2, the end member 11
Are formed by three narrow and long flat plates, curved grooves 13 and 13 ′ are engraved on the back surface, the heat medium tube 12 is embedded in these grooves, and an aluminum foil 16 is attached to the surface. As a result, the three narrow and long flat plates are integrated so that the heat medium tube 12 does not come off from the curved groove. As shown in FIG. 1, the curved groove receives the heat medium tube from the end on the side of the linear arrangement member, and refers to an arc or groove. The curved groove is adjacent to each other between the inlet side and the return side of the heat medium tube 12. If it is, a circular arc (13) having a small radius is formed and the direction is changed, but if the distance between the entry side and the return side is large, the direction is changed by drawing a changed arc (13 '). As described above, the surface material may be attached to the surface of the flat plate (composite plate).

The heat medium tube 12 buried in the curved groove of the end member 11 is connected by one unit to one unit, and is connected to one header 14. The heat medium tubes 12 between the two end members are preferably arranged so as to be parallel to each other at the same interval. In FIG. 2, the side grooves of the end member 11
7 is provided. As described above, the tongue groove 17 can be combined with the tongue and groove provided on the opposing side surface, or can be combined with the tongue and groove tongue.

The heat medium tubes 12 embedded in the curved grooves of the two end members are exposed between the end members (see FIG. 1), and as shown in FIG. 31 can be folded with their surfaces facing each other. At this time, care is taken so that the heat medium tubes 32 are not entangled. As shown in FIG. 4, a plurality of narrow and long linear arrangement members 34 can be packed and stored, so that space can be saved.

When constructing a floor that can be heated according to the method of the present invention, as shown in FIG. 5, a slab surface of a concrete building, a heat insulating material 35 and a joist 36 are placed, and a base floor is placed thereon. The plywood 37 is arranged. First, the two end members 31 are arranged at predetermined positions on the base floor plywood 37,
Borrow with a nail 39. Next, the ground floor plywood 37
On the lower side of the exposed heat medium tube 32 on the upper side, a comb-shaped construction member 50 shown in FIG.
From the third side, the comb-like construction member 50 is pushed almost at right angles to the heat medium tube 32. The pushed-in construction member 50 is set upright at right angles to the base floor plywood 37, and the heat medium tube 32
Are lifted from the base floor plywood 37, and in this state, the heat medium tubes 32 are inserted into the grooves formed on the back surface of the linear arrangement member 34.
Buried.

The comb-shaped construction member 50 is connected to the other end member 31.
Side, and one end in the length direction of the first linear arrangement member 34 is pressed and fixed to the opposite end of the end member 31. When the exposed portion of the heat medium tube 32 is sufficiently long, the exposed plurality of heat medium tubes 32 are guided by the relatively shallow guide grooves 51 of the comb-like construction member 50.
The width of the exposed portion of the heat medium tube on which the linear plate (B) in the last row and its vicinity (the second sheet from the last row) is arranged can be increased. In this case, when the comb-like member 50 is used as the heat medium tube, the tube is preferably guided by the relatively deep guide groove 52 of the comb-like member 50.

[0033]

The present invention has the following particularly advantageous effects, and its industrial value is extremely large. 1. According to the method of constructing a heatable floor according to the present invention, first, two end members are arranged at predetermined positions, and then a linear arrangement member may be sequentially arranged between the two end members. Therefore, the construction work is extremely simple and requires no skill. 2. ADVANTAGE OF THE INVENTION According to the construction method of the floor which can be heated which concerns on this invention, it is comprised with two types of members of an end member and a linear arrangement member, and an end member is easy to manufacture, can be folded, and has a linear arrangement. Since multiple members can be stacked, packing, storage,
Easy handling during transport and construction. 3. According to the method for constructing a heatable floor according to the present invention, when the remaining width of the heat medium tube portion exposed between the two end members is reduced, the heat medium heated to the heat medium tube The heat-expanding portion through which the heat-expanding portion expands allows the width of the exposed heat medium tube portion where the second straight flat plate (B) is arranged from the final row or the final row to be widened, and the final row or the final row can be easily formed. And the second linear flat plate (B) can be fitted and arranged. 4. When using a comb-shaped construction member, it is easy to tension the multiple heat medium tubes and adjust the distance between the heat medium tubes, and apply an adhesive or the like in advance to the surface of the base surface Even in this case, the heat medium tube can be lifted so as not to come into contact with the base surface, and the linear arrangement member can be slid so that it can be extremely easily arranged at a predetermined position.

[Brief description of the drawings]

FIG. 1 is a plan view showing a state in which two end members are arranged to face each other.

FIG. 2 is an enlarged longitudinal sectional end view taken along a line AA in FIG.

FIG. 3 is a perspective view of a state in which the front sides of two end members are overlapped and folded.

FIG. 4 is a perspective view of a state in which a plurality of linear arrangement members are stacked.

FIG. 5 is a perspective view showing an example of a method of constructing a floor that can be heated.

FIG. 6 is a side view of an example of a comb-shaped construction member according to the present invention.

[Explanation of symbols]

 11, 31: end member 12, 32: heat medium tube 13, 13 ': curved groove 14: header 15: flat plate 16: aluminum foil 17: groove 34: linear arrangement member 35: heat insulating material 36: joist 37: Base floor plywood 38: Dummy plate 39: Nail 40: Header hole 41: Adhesive or double-sided adhesive tape 50: Comb-like construction member 51: Relatively shallow guide groove 52: Relatively deep guide groove 53: Sharp angle Tip

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Noriaki Inoue 3-2-2 Chuo, Ami-cho, Inashiki-gun, Ibaraki Pref.

Claims (3)

[Claims] 1. An end member (A) forming opposing ends having a substantially square planar shape, and a plurality of narrow and long elongated members disposed between the opposing end members (A). In constructing a floor that can be heated by a heatable floor-constructing member that is formed of a linear flat plate (B) and has a substantially square planar shape, first, the opposite ends of the end member (A) are heated with a heat medium. The surface in which the tubes for the heat medium are buried is positioned on the lower side, and the exposed plurality of tubes for the heat medium are arranged at predetermined positions at right angles to both ends, and then exposed between both ends of the end member (A). A linear flat plate (B) placed on a plurality of heat medium tubes from above
Are sequentially arranged from one end side to the other end side of the end member (A), and when the final row and the linear flat plate (B) in the vicinity of the last row are arranged, the heat medium that has been heated is passed through the heat medium tube. A method for constructing a heatable floor, characterized in that the heat medium tube portion exposed by displacing the other end of the component member (A) is widened and a linear flat plate (B) near the last row is arranged. . 2. The end member (A) is composed of one to five flat plates having a narrow width and a long length, and a curved groove for embedding a tube for a heat medium and changing the direction is formed on the back surface. The communicating heat medium tubes are buried in the curved grooves at the opposite ends, and a heat equalizing material and / or a backing material are stuck on the surface so that the heat medium tubes do not come off from the curved grooves. , Between the opposing end members (A) are arranged so as to communicate with the heat medium tube being exposed, and a linear flat plate (B) is formed.
2. The method for constructing a heatable floor according to claim 1, wherein a plurality of parallel grooves for burying a tube for a heat medium are formed at right angles to a longitudinal direction on a back surface thereof. The heat medium tube exposed between the opposing end members (A) is straightened by adjusting the distance between the heat medium tubes by a comb-shaped member (C). The method according to claim 1, wherein B) is arranged.