Concrete sauna

Abstract

To provide a concrete sauna with low environmental load that can be installed outdoor such as in a garden of a house and a villa area, and that can be always used as a high-temperature dry sauna.SOLUTION: A concrete sauna includes: a floor plate 2, right and left side wall plates 3, 4, a rear wall plate 5 and a ceiling plate 6 which are individually produced from low-carbon concrete containing cement, blast furnace slag fine powder, and fly ash by precast construction; a front-opening, box-shaped concrete housing 1 formed by connecting them; a front surface wall 7 that closes the front opening of the concrete housing 1, has an opening / closing door 8, and uses a heat-resistant tempered glass at least in part; a water-repellent agent applied to an outer surface of the concrete housing 1; heat insulation materials provided on inner surfaces of the right and left side wall plates 3, 4, the rear wall plate and the ceiling plate 6 of the concrete housing 1; and wood materials 12 provided on the inner surfaces of the heat insulation materials. A sauna room S is formed by the concrete housing 1 and the front surface wall 7.SELECTED DRAWING: Figure 10

Description

Technical Field

[0001] The present invention relates to a concrete sauna that is directly installed outdoors and forms a sauna room with concrete.

Background Art

[0002] Saunas installed in hot bath facilities such as public baths and hot springs are said to have many health effects such as promoting sweating, recovering from fatigue, relieving stress, and improving the quality of sleep, and are used by many people. Also, as types of saunas, there are dry saunas with a high temperature of about 80 to 100°C and a low humidity of about 5 to 10% indoors, Finnish saunas characterized by a humidity of about 15 to 10% like this dry sauna, where the indoor temperature is high and water is poured on heated sauna stones for a steam bath, steam saunas and mist saunas called wet saunas with a medium to low temperature of about 40 to 70°C indoors and a humidity of 90% or more with steam or mist, and far-infrared saunas with a low temperature of about 40 to 60°C and low humidity indoors, among others.

[0003] Many of these saunas are installed in indoor hot bath facilities, but in recent years, due to the sauna boom, there has been an increasing desire to enjoy a sauna outdoors, such as in the garden of one's own home or at a villa. And as types of saunas installed outdoors, there are, for example, wooden log house type saunas, cylindrical wooden barrel saunas shaped like a barrel lying on its side, and concrete saunas using concrete with a large heat capacity.

[0004] Generally, when comparing the heat storage properties of concrete and wood, concrete has higher heat storage, so a concrete sauna that can greatly suppress the thermal energy required to maintain the temperature has a higher energy-saving effect than a wooden sauna, and thus can contribute to reducing the environmental load.

[0005] As an example of this concrete sauna, Patent Document 1 discloses a bathing room in which a floor portion, side wall portions, and a ceiling portion are made of concrete, an outer wall heat insulating material layer formed on the outer surfaces of the side wall portions and the ceiling portion, a passage portion formed in the floor portion, a bed portion formed in the floor portion at a position higher than the passage portion, a radiator rock that emits electromagnetic waves such as far-infrared rays with its surface exposed and embedded on the upper surface of the bed portion, and a heating portion that is at least embedded in the bed portion and heats the radiator rock.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] Here, since concrete is generally said to crack when the temperature difference between the inside and the outside reaches a predetermined temperature (for example, 15°C) or more, the temperature in the bathing room of the sauna using the concrete of Patent Document 1 is set to a low temperature of 40°C to 50°C. However, since dry saunas that can obtain a refreshing feeling by sweating at a high temperature (from 80°C to 100°C) are also popular, a high-temperature sauna using concrete is desired.

[0008] As described above, one of the causes of concrete cracking is the temperature difference between the inside and the outside, but moisture penetration is also one of the causes of cracking. This is because there are countless capillaries vertically and horizontally inside the concrete, and the moisture inside this concrete dissolves calcium hydroxide, which is the main component of the concrete, and oozes out to the surface.

[0009] Also, when water penetrates to the reinforcing bars inside the concrete, these reinforcing bars corrode, causing cracks in the concrete, and more rainwater enters through these cracks, accelerating the deterioration. In particular, when acidic rain due to air pollution or water containing calcium chloride spread on roads as a snow melting agent in snowy areas such as Hokkaido penetrates, the deterioration accelerates even more.

[0010] For this reason, in the case of a concrete sauna installed outdoors, there has been a problem that rainwater hits the concrete housing and moisture penetrates, and especially when used in winter, the temperature difference between the low outside air temperature and the high temperature inside the sauna becomes large, causing cracks in the concrete wall and resulting in damage.

[0011] Furthermore, since it is more efficient to transport in the form of flat panels rather than transporting the box-shaped concrete housing as it is, there is also a disclosure of transporting in the state of concrete panels and joining the concrete panels to each other at the fitting part with a joint. In this case, since only the panel ends are fitted together, there is a problem that the strength of the joint part becomes weak.

[0012] The present invention has been made in view of such problems, and an object thereof is to provide a concrete sauna that can be installed outdoors such as in a home garden or a villa site, has sufficient strength even when concrete plates are combined on site, and can always be used as a high-temperature dry sauna with a small environmental load.

Means for Solving the Problems

[0013] The concrete sauna according to claim 1 of the present invention comprises a floor slab, left and right side wall slabs, a rear wall slab, and a ceiling slab, each individually manufactured by a precast method using low-carbon concrete containing cement, fine blast furnace slag powder, and fly ash; a concrete housing formed by connecting these floor slab, left and right side wall slabs, rear wall slab, and ceiling slab into a box shape with an opening at the front; an entrance formed by closing the front opening of the concrete housing and being blocked by an opening / closing door that can be opened and closed, a front wall using heat-resistant reinforced glass for at least a part thereof; a water repellent applied to the outer surface of the concrete housing; a heat insulating material provided inside the left and right side wall slabs, rear wall slab, and ceiling slab of the concrete housing; and wood provided inside this heat insulating material, and is characterized in that a sauna room is formed by the concrete housing and the front wall.

[0014] The concrete sauna according to claim 2 is characterized in that, in claim 1, cement is blended at a ratio of 30 to 60% by mass, fine blast furnace slag powder is blended at a ratio of 30 to 60% by mass, and fly ash is blended at a ratio of 10 to 15% by mass.

[0015] The concrete sauna according to claim 3 is characterized in that, in claim 1, it is fixed to the floor slab and the ceiling slab at at least fixed parts formed vertically, a connecting rod extending in the vertical direction is provided, insertion holes extending in the vertical direction are formed for the connecting rod to pass through, the left and right side wall slabs positioned between the floor slab and the ceiling slab, and a rear wall fixing tool for fixing the rear wall slab to the rear ends of these floor slab, ceiling slab, and left and right side wall slabs are provided.

Advantages of the Invention

[0016] The concrete sauna according to the present invention comprises a floor slab, left and right side wall slabs, a rear wall slab, and a ceiling slab, each individually manufactured by a precast method using low-carbon concrete containing cement, fine blast furnace slag powder, and fly ash; a concrete housing formed by connecting these floor slab, left and right side wall slabs, rear wall slab, and ceiling slab into a box shape with an opening at the front; an entrance formed by closing the front opening of the concrete housing and being blocked by an opening / closing door that can be opened and closed, a front wall using heat-resistant reinforced glass for at least a part thereof; and a water repellent applied to the outer surface of the concrete housing.

[0017] Also, by mixing cement in a proportion of 30 to 60% by mass, finely ground blast furnace slag in a proportion of 30 to 60% by mass, and fly ash in a proportion of 10 to 15% by mass, the water penetration rate coefficient value of the low-carbon type concrete used in the present invention can be set to 0.70 to 1.80 (mm / √hr).

[0018] By using such low-carbon type concrete with a low water penetration rate coefficient value, that is, concrete in which water hardly penetrates, and further applying a water repellent to the outer surface of the concrete housing, it is possible to prevent moisture such as rainwater from penetrating into the concrete, and to prevent cracking of the concrete housing due to the intrusion of moisture as much as possible.

[0019] In addition, an extruded polystyrene foam heat insulating material provided on the inner surfaces of the left and right side wall plates, the rear wall plate, and the ceiling plate of the concrete housing, wood provided inside this heat insulating material, and a moisture-proof material such as an aluminum sheet disposed between this wood and the heat insulating material are provided, and a sauna room is formed by the concrete housing and the front wall. By using it as a high-temperature sauna with the temperature inside the sauna room being 80°C to 100°C, even when the outside air temperature is low, it is possible to prevent the high temperature inside the sauna room from being transmitted to the concrete housing as much as possible, so that the temperature difference between the inner and outer surfaces of the concrete housing can be reduced.

[0020] Therefore, since the amount of thermal energy required to maintain the temperature inside the sauna room is small, the energy-saving effect can be enhanced, and cracking of the concrete housing due to the temperature difference with the outside air temperature can be prevented as much as possible.

[0021] Thus, according to the concrete sauna of the present invention, it is only necessary to install a concrete housing outdoors such as in a home garden or a villa site, so that installation is relatively easy. In addition, since it is less likely to crack even when used as a high-temperature dry sauna, it is possible to provide a concrete sauna with high durability and a small environmental load.

[0022] Furthermore, when installed outdoors using transparent heat-resistant tempered glass for the front wall, the view in front can be enjoyed. Also, opaque heat-resistant tempered glass may be used considering privacy.

[0023] In addition, the concrete sauna according to claim 3 of the present invention, in claim 1, is fixed to the floor board and the ceiling board with screws which are at least fixing parts formed vertically, connection rods such as split bolts extending in the vertical direction, and insertion holes extending in the vertical direction are formed for inserting these connection rods, and the left and right side wall boards located between the floor board and the ceiling board, and back wall fixing tools such as split bolts and nuts for fixing the back wall board to the rear ends of these floor board, ceiling board, and left and right side wall boards are provided.

[0024] In this way, since the connection rod can penetrate the floor board, side wall board, and ceiling board and be firmly fixed at the fixing part, it can contribute to improving the durability of the concrete sauna.

Brief Description of the Drawings

[0025]

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Mode for Carrying Out the Invention

[0026] The present invention relates to a concrete sauna CS that can be installed outdoors such as in a home garden, a villa site, or even a campsite, and can particularly be used as a dry sauna at a high temperature of 80°C to 100°C. Further, the concrete used in the present invention has higher heat storage properties than a wooden log house type sauna or a barrel sauna, so the heat energy required to maintain the temperature in the sauna room can be reduced, the energy saving effect can be enhanced, and the environmental load can be minimized.

[0027] The installation location of the concrete sauna CS can be anywhere as long as the ground is flat and the ground bearing capacity is 2.0 t / m2 or more. If the ground is not flat, it can be used as an installation ground by ensuring horizontal with gravel or crushed stone and compacting the ground. Usually, if it is land created in a residential area or a garden, the ground bearing capacity is 2.0 t / m2 or more.

[0028] Hereinafter, Example 1 of the present invention will be described in detail with reference to the drawings.

Example

[0029] FIGS. 1 to 4 show the concrete housing 1 of the front opening 1A constituting the concrete sauna CS of the present invention. This concrete housing 1 is made of low-carbon concrete containing cement, blast furnace slag fine powder, and fly ash, and the floor slab 2, left and right side wall plates 3, 4, rear wall plate 5, and ceiling plate 6 are individually manufactured by a precast method. As will be described later, the low-carbon concrete of the present invention containing cement, blast furnace slag fine powder, and fly ash is a concrete with a low moisture penetration rate coefficient and is difficult for moisture to penetrate.

[0030] Further, as shown in FIGS. 5 to 8, the concrete housing 1 of the present invention is fixed to the floor slab 2 and the ceiling slab 6 with screws which are at least fixed parts formed vertically, and includes a connecting rod 15 composed of a split bolt extending in the vertical direction. Insertion holes 16 extending in the vertical direction are formed in the left and right side wall plates 3 and 4 for inserting the connecting rod 15, and the left and right side wall plates 3 and 4 are located between the floor slab 2 and the ceiling slab 6. In addition, in the first embodiment, the connecting rod 15 is a split bolt, but it may be a long rod with threads cut only at the part fixed to the floor slab 2 and the ceiling slab 6.

[0031] A total of eight connecting rods 15, four each, are provided on the left and right side wall plates 3 and 4, respectively, but this varies depending on the size of the concrete housing 1. Further, floor slab screw holes 17 are formed in the floor slab 2, and the connecting rod 15 and the floor slab 2 are fixed by screwing the lower fixing part (threaded part) 18 of the connecting rod 15 into the screw holes 17.

[0032] Also, as shown in FIG. 6 which is part A of FIG. 5, the upper fixing part (threaded part) 19 of the connecting rod 15 fixes the left and right side wall plates 3 and 4 with side wall nuts 20 and fixes the ceiling slab 6 with a ceiling slab nut 21. A lower surface countersink 22 is formed at the position of the side wall nut 20 of the ceiling slab 6, and an upper surface countersink 23 is formed at the position of the ceiling slab nut 21 so that the ceiling slab 6 does not interfere with the nuts 20 and 21.

[0033] Furthermore, the rear wall plate 5 is fixed to the rear ends of the floor slab 2, the left and right side wall plates 3 and 4, and the ceiling slab 6 with a rear wall fixing tool 26 composed of a rear wall plate split bolt 24 and a rear wall plate nut 25. Rear end screw holes 27 are formed at the rear ends of the respective plates 2, 3, 4, and 6, and the rear wall fixing tool 26 and the floor slab 2, the left and right side wall plates 3 and 4, and the ceiling slab 6 are fixed by screwing the rear wall plate split bolt 24 of the rear wall fixing tool 26 into the rear end screw holes 27.

[0034] Further, as shown in Fig. 8, which is part B of Fig. 7, a rear surface countersink 28 is formed on the rear wall plate 5 so as not to interfere with the rear wall plate nut 25 of the rear wall fixture 26. The rear wall plate 5 is fixed to the floor plate 2, the left and right side wall plates 3, 4, and the ceiling plate 6 by this rear wall plate nut 25 and the rear wall plate slitting bolt 24.

[0035] As described above, since the connecting rod 15 can be inserted through the floor plate 2, the left and right side wall plates 3, 4, and the ceiling plate 6 and firmly fixed by the lower fixing portion 18, the upper fixing portion 19, and the respective nuts 20, 21, it can contribute to improving the durability of the concrete sauna CS.

[0036] Also, a front wall 7 formed of transparent heat-resistant glass is attached to the front opening 1A of the concrete housing 1 having such a structure, and an entrance is formed in this front wall 7. Further, an opening / closing door 8 formed of transparent heat-resistant glass is provided at the entrance of this front wall 7. Incidentally, the front wall 7 and the opening / closing door 8 may be opaque heat-resistant reinforced glass in consideration of privacy.

[0037] Furthermore, as shown in Figs. 9 and 10, in the concrete sauna SC of Example 1 of the present invention, a heat-resistant reinforced glass window 5A is installed on the rear wall plate 5 of the concrete housing 1. If this heat-resistant reinforced glass window 5A is made of transparent glass, the rear view when installed outdoors can also be seen. Also, an opaque heat-resistant reinforced glass 5A may be used in consideration of privacy. In this case, external light can be taken into the sauna room S during the day.

[0038] Also, 13 is a wooden sauna bench provided on the left and right, and 14 is an electric stove for heating the inside of the sauna room S, and it has an I-shaped layout in plan view. Incidentally, a wood stove can be used instead of the electric stove 14, but in this case, it is necessary to provide a chimney for exhaust.

[0039] FIG. 17 is a partial cross-sectional view showing the cross-sectional structure of the wall portion of the concrete sauna CS of the present invention. And, a water repellent 9 containing silicon and fluorine is applied to the outer surfaces of the floor plate 2, the left and right side wall plates 3 and 4, the rear wall plate 5, and the ceiling plate 6 of the concrete housing 1, so that moisture such as rainwater can be prevented from penetrating into the concrete, and cracking of the concrete housing 1 due to the intrusion of moisture can be prevented as much as possible.

[0040] On the other hand, an extruded polystyrene foam heat insulating material 10 is provided on the inner surfaces of the left and right side wall plates 3 and 4, the rear wall plate 5, and the ceiling plate 6 of the concrete housing 1. An aluminum sheet 11 as a moisture-proof material is provided inside the heat insulating material 10, and wood 12 is provided inside the aluminum sheet 11.

[0041] As described above, the sauna room S is formed by the concrete housing 1 and the front wall 7, and by providing the heat insulating material 10, the aluminum sheet 11, and the wood 12 inside the concrete housing 1, it can be used as a high-temperature sauna with the temperature inside the sauna room S being 80°C to 100°C. Even when the outside air temperature is low, the high temperature inside the sauna room S can be prevented from being transmitted to the concrete housing 1 as much as possible, so that the temperature difference between the inner and outer surfaces of the concrete housing 1 can be reduced.

[0042] With such a configuration, the heat energy required to maintain the temperature inside the sauna room S can be reduced to enhance the energy-saving effect, and the temperature difference from the outside air temperature can be reduced, so that cracking of the concrete housing 1 due to the temperature difference can be prevented as much as possible.

[0043] Further, in the concrete sauna CS of the present invention, since the floor plate 2 of the concrete housing 1 is formed in a downward inclined shape from the rear wall plate 5 toward the front, drainage during cleaning work can be easily performed.

[0044] Furthermore, in the concrete sauna CS of the present invention, a rear wall ventilation hole 5B is provided at the lower part of the rear wall plate 5 of the concrete housing 1, and a left side wall ventilation hole 3A is formed at the upper front part of the left side wall plate 3 on the left side in a front view. Therefore, ventilation in the sauna room S can be efficiently performed. Incidentally, the ventilation hole in the side wall may be provided in the right side wall plate 4 on the right side in a front view.

[0045] By providing the rear wall ventilation hole 5B and the left side wall ventilation hole 3A in this way, a wind flow can be created in the sauna room S. Therefore, it is possible to take a sauna with fresh air at all times, to make the temperature difference in the sauna room S uniform to some extent, and furthermore, to raise the perceived temperature by allowing a slight wind flow. In addition, it is possible to discharge the steam generated when performing low-temperature sweating and the moisture dispersed in the air simply by sweat, and to suppress the deterioration of the sauna room S and the concrete housing 1. Therefore, the durability of the concrete sauna CS can be improved.

[0046] Here, as described above, the concrete of the present invention can be made into a low-carbon type concrete with a low moisture penetration rate coefficient, that is, a concrete in which moisture hardly penetrates, by including cement, blast furnace slag fine powder, and fly ash.

[0047] Low-carbon concrete is a type in which about 40 to 70% by mass of cement is replaced by industrial by-products, namely, fine powders of blast furnace slag, fly ash, etc. It reduces the amount of cement that requires a large amount of energy during manufacturing and contributes to carbon reduction. In the low-carbon concrete of the present invention, cement is blended at a ratio of 30 to 60% by mass, fine powder of blast furnace slag at 30 to 60% by mass, and fly ash at 10 to 15% by mass. Since low-carbon concrete contains fly ash and blast furnace slag, magnesium oxide is mixed in. Generally, concrete was considered to be prone to cracking due to impurities such as magnesium oxide. Therefore, when using low-carbon concrete for the housing of an outdoor sauna with a large temperature difference, it was predicted that water intrusion would become severe. However, by devising an appropriate blending amount, we succeeded in manufacturing a housing that is denser and less permeable to water than concrete that does not contain fly ash and blast furnace slag.

[0048]

Table 1

[0049] According to this Table 1, in the low-carbon concrete of the present invention, when the design service life is 100 years, a cover of 8 mm for the reinforcement is sufficient, whereas for conventional concrete with a water penetration rate coefficient value of 2.54 (mm / √hr), 15 mm or more is required, and for conventional concrete with a water penetration rate coefficient value of 4.6 (mm / √hr), 25 mm or more is required.

[0050] In addition, when the designed service life of conventional concrete was 20 years, those with a water penetration rate coefficient value in the range of 2.54 to 2.85 (mm / √hr) could be handled with a steel bar cover of 8 mm. However, for conventional concrete exceeding 2.85 (mm / √hr), the steel bar cover had to be 9 mm or more. Even with the same steel bar cover, the low-carbon type concrete of the present invention has a significantly extended service life compared to conventional concrete.

[0051] Furthermore, FIG. 18 is a comparison diagram of the cross-sectional structures of the wall portions of the concrete sauna CS of the present invention and a wooden sauna. In the concrete sauna CS of the present invention, a heat insulating material 10 is provided on the inner surface of the concrete housing 1, and further, wood 12 is provided inside the heat insulating material 10. On the other hand, in a wooden barrel sauna, a heat insulating material 10 is provided on the inner surface of the wood 12, and wood 12 is provided inside this heat insulating material 10.

[0052] In the concrete sauna CS and the wooden barrel sauna of the present invention, since the inner structures are both unchanged by the wood 12 and the heat insulating material 10, the superiority or inferiority of the heat storage property in the sauna room S is the result of comparison by the heat capacities of concrete and wood.

[0053]

Table 2

[0054] Hereinafter, the installation of such a concrete sauna CS will be described in detail with reference to FIGS. 13 to 18. The installation location of the concrete sauna CS can be anywhere as long as the ground is flat and the ground bearing capacity is 2.0 t / m² or more. Therefore, it can be installed in any preferred location on the land created in a residential lot or a garden. However, if the ground is not flat, it is necessary to create a level surface with gravel or crushed stone, compact the ground, and then create the installation ground.

[0055] Once the installation location is determined, assemble the concrete housing 1 using the floor slab 2, left and right side wall panels 3, 4, rear wall panel 5, and ceiling panel 6 that are individually manufactured by the precast method. First, as shown in Fig. 13, insert and fix a long connecting rod 15 made of split bolts or the like into the floor slab screw holes 17 formed on both left and right sides of the floor slab 2. The split bolt illustrated in Fig. 13 is M20, but other sizes such as M16 can also be used. Next, as shown in Figs. 14 and 15, insert the connecting rod 15 into the insertion holes 16 of the left and right side wall panels 3, 4, and attach side wall nuts 20 to the upper fixing parts 19 to fix the left and right side wall panels 3, 4. Then, as shown in Figs. 15 and 16, place the ceiling panel 6 on the upper surfaces of the left and right side wall panels 3, 4, and tighten the ceiling panel nuts 21 to the upper fixing parts 19 to fix the floor slab 2, left and right side wall panels 3, 4, and ceiling panel 6.

[0056] Next, as shown in Figs. 17 and 18, screw the rear wall split bolts 24 into the rear end screw holes 27 formed in the floor slab 2, left and right side wall panels 3, 4, and ceiling panel 6. Then, attach the rear wall panel 5 to the rear ends of the floor slab 2, left and right side wall panels 3, 4, and ceiling panel 6, and tighten the rear wall nuts 25 to the rear wall split bolts 24 of the rear wall fixture 26 to fix the rear wall panel 5 to the floor slab 2, left and right side wall panels 3, 4, and ceiling panel 6. Thus, the concrete housing 1 of the present invention is completed.

[0057] In addition, a water repellent 9 is applied to the outer surface of this concrete housing 1, but it may be applied after manufacturing the floor slab 2, left and right side wall panels 3, 4, rear wall panel 5, and ceiling panel 6 at the factory, or it may be applied after transporting them to the installation location.

[0058] After installing the concrete housing 1, a heat insulating material 10 is attached to the inner surfaces of the left and right side wall plates 3, 4, the rear wall plate 5, and the ceiling plate 6 of the concrete housing 1, an aluminum sheet 11 is attached inside the heat insulating material 10, and a wood 12 is attached inside the aluminum sheet 11, respectively. Then, wooden sauna benches 13 are provided on the left and right side wall plates 3, 4 respectively, and an electric stove 14 for heating the inside of the sauna room S is installed approximately at the center.

[0059] After installing the bench 13 and the stove 14 in the sauna room S, the front opening 1A of the concrete housing 1 is closed with a front wall 7 and an opening / closing door 8 made of transparent heat-resistant glass, and a transparent heat-resistant reinforced glass window 5A is also attached to the rear wall plate 5 of the concrete housing 1, thereby completing the concrete sauna CS.

[0060] In the above description, the heat insulating material 10, the aluminum sheet 11, the wood 12, and the sauna bench 13 are installed after installing the concrete housing 1. However, these heat insulating material 10 and aluminum sheet 11 may be attached to the left and right side wall plates 3, 4, the rear wall plate 5, and the ceiling plate 6 of the concrete housing 1 in advance before transporting them to the installation location.

[0061] Next, referring to FIGS. 19 and 20, Example 2 of the present invention will be described in detail. The same parts as those in Example 1 are denoted by the same reference numerals, and the description will be centered on the parts different from those in Example 1, and the other parts will be described briefly or omitted.

Example

[0062] In this Example 2, since the heat-resistant reinforced glass window 5A of Example 1 is not provided on the rear wall plate 5 of the concrete housing 1, the heat energy required to maintain the temperature of the sauna room S can be reduced.

[0063] Next, referring to FIGS. 21 and 22, Example 3 of the present invention will be described in detail. The same parts as those in Example 1 are denoted by the same reference numerals, and the description will be centered on the parts different from those in Example 1, and the other parts will be described briefly or omitted.

Example

[0064] In this Example 3, since the heat-resistant reinforced glass window 5A of Example 1 is not provided on the rear wall panel 5 of the concrete housing 1, the thermal energy required to maintain the temperature of the sauna room S can be reduced.

[0065] The sauna bench 13 is provided on the left side wall panel 3 and the rear wall panel 5 side, and forms an L shape in plan view. For this reason, the electric stove 14 is arranged on the right side wall panel 4 side, the left side wall ventilation hole 3A is provided at the upper rear part of the left side wall panel 3 on the left side in front view, and the right side wall ventilation hole 4A is provided at the lower front part of the right side wall panel 4 on the right side in front view, respectively.

[0066] As described in detail above, the concrete sauna SC according to the present invention includes a floor slab 2, a left side wall panel 3, a right side wall panel 4, a rear wall panel 5, a ceiling panel 6, each individually manufactured by a precast method using a low-carbon concrete containing cement, blast furnace slag fine powder, and fly ash, and a concrete housing 1 formed in a box shape by connecting these floor slab 2, left side wall panel 3, right side wall panel 4, rear wall panel 5, and ceiling panel 6 with a front opening 1A. A front wall 7 that closes the front opening 1A of the concrete housing 1 and forms an entrance / exit that is closed by an openable and closable opening / closing door 8, and at least a part of which uses heat-resistant reinforced glass, and a water repellent 9 containing any one or more of silicon, silane, and fluorine applied to the outer surface of the concrete housing 1.

[0067] Also, by mixing cement in a blending ratio of 30 to 60% by mass, blast furnace slag fine powder in a blending ratio of 30 to 60% by mass, and fly ash in a blending ratio of 10 to 15% by mass, the water penetration rate coefficient value of the low-carbon concrete used in the present invention can be set to 0.70 to 1.80 (mm / √hr).

[0068] By using such a low-carbon concrete with a low water penetration rate coefficient value, that is, a concrete in which water hardly penetrates, and further applying the water repellent 9 to the outer surface of the concrete housing 1, it is possible to prevent moisture such as rainwater from soaking into the concrete, and to prevent cracking of the concrete housing 1 due to the intrusion of moisture as much as possible.

[0069] In addition, an extruded polystyrene foam heat insulating material 10 provided on the inner surfaces of the left side wall panel 3, right side wall panel 4, rear wall panel 5, and ceiling panel 6 of the concrete housing 1, a wood 12 provided inside the heat insulating material 10, and a moisture-proof material 11 such as an aluminum sheet disposed between the wood 12 and the heat insulating material 10 are provided. By forming the sauna room S with the concrete housing 1 and the front wall 7, it is used as a high-temperature sauna with the temperature inside the sauna room S being 80°C to 100°C. Further, even when the outside air temperature is low, the high temperature inside the sauna room S can be prevented from being transmitted to the concrete housing 1 as much as possible, so that the temperature difference between the inner and outer surfaces of the concrete housing 1 can be reduced.

[0070] Therefore, the thermal energy required to maintain the temperature inside the sauna room S can be small, so that the energy-saving effect can be enhanced, and the concrete housing 1 can be prevented from cracking due to the temperature difference with the outside air temperature as much as possible.

[0071] Thus, according to the concrete sauna CS of the present invention, it is only necessary to install the concrete housing 1 outdoors such as in the garden of a house or a villa site, so that it can be installed relatively easily. In addition, since it is not easily cracked even when used as a high-temperature dry sauna, a concrete sauna CS with high durability and a small environmental load can be provided.

[0072] Furthermore, when installed outdoors using transparent heat-resistant tempered glass on the front wall 7, the view in front can be observed. Also, opaque heat-resistant tempered glass may be used in consideration of privacy.

[0073] In addition, the concrete sauna CS according to claim 3 of the present invention is fixed to the floor board 2 and the ceiling board 6 with screws which are at least the lower fixing part 18 and the upper fixing part 19 formed vertically, and a connecting rod 15 such as a split bolt extending in the vertical direction, and an insertion hole 16 extending in the vertical direction for the connecting rod 15 to pass through is formed. Further, the left side wall board 3 and the right side wall board 4 positioned between the floor board 2 and the ceiling board 6, and a rear wall fixing tool 26 such as a rear wall split bolt 24 and a rear wall nut 25 for fixing the rear wall board 5 to the rear ends of the floor board 2, the ceiling board 6, the left side wall board 3 and the right side wall board 4 are provided.

[0074] In this way, since the connecting rod 15 can pass through the floor board 2, the left side wall board 3, the right side wall board 4, and the ceiling board 6 and be firmly fixed by the lower fixing part 18 and the upper fixing part 19, it can contribute to improving the durability of the concrete sauna CS.

[0075] Furthermore, when the concrete sauna CS is installed outdoors using transparent heat-resistant tempered glass for the front wall 7, the scenery in front can be viewed. Also, opaque heat-resistant tempered glass may be used considering privacy.

[0076] In addition, since the floor part 2 of the concrete housing 1 of the concrete sauna CS is formed in a downward inclined shape from the rear wall part 5 toward the front, drainage during cleaning work can be easily performed.

[0077] Furthermore, a heat-resistant tempered glass window 5A is installed on the rear wall part 5 of the concrete housing 1 of the concrete sauna CS. If this heat-resistant tempered glass window 5A is made of transparent glass, the scenery behind when installed outdoors can also be viewed. Also, opaque heat-resistant tempered glass may be used considering privacy. In this case, external light can be introduced into the sauna room during the day.

[0078] In addition, in the concrete sauna CS, ventilation holes 3A, 4A, and 5B are formed in the lower part of the rear wall portion 5 of the concrete housing 1 and the upper front part of either the left or right side wall portions 3, 4, or the upper rear part and the lower front part of either the left or right side wall portions 3, 4. Therefore, ventilation in the sauna room S can be efficiently performed.

[0079] In this way, by providing a rear wall ventilation hole 5B in the lower part of the rear wall portion 5, a left side wall ventilation hole 3A in the upper front part of the left side wall portion 3, or a left side wall ventilation hole 3A in the upper rear part of the left side wall portion 3, and a right side wall ventilation hole 4A in the lower front part of the right side wall portion 4 respectively, a wind flow can be created in the sauna room S. Therefore, it is possible to take a sauna with fresh air at all times, the temperature difference in the sauna room S can be made uniform to a certain extent, and furthermore, the felt temperature can be increased by a small amount of wind flow. In addition, steam generated when performing lowryu or moisture dispersed in the air simply by sweat can be discharged, and deterioration of the sauna room S and the concrete housing 1 can be suppressed. Therefore, the durability of the concrete sauna CS can be improved.

Explanation of Signs

[0080] CS Concrete sauna S Sauna room 1 Concrete housing 1A Front opening 2 Floor board 3 Left side wall board 3A Left side wall ventilation hole 4 Right side wall board 4A Right side wall ventilation hole 5 Rear wall board 5A Heat-resistant reinforced glass window of the rear wall board 5B Rear wall ventilation hole 6 Ceiling board 7 Front wall 8 Opening and closing door 9 Water repellent 10 Heat insulating material 11 Moisture-proof material 12 Wood 13 Sauna bench 14 Electric stove 15 Connecting rod 16 Insertion hole 17 Bedplate Screw Hole 18 Lower Fixing Part (Cutting Bolt) 19 Upper Fixing Part (Cutting Bolt) 20 Side Wall Plate Nut 21 Ceiling Plate Nut 22 Counterbore on the Lower Surface of the Ceiling Plate 23 Counterbore on the Upper Surface of the Ceiling Plate 24 Rear Wall Plate Cutting Bolt 25 Rear Wall Plate Nut 26 Rear Wall Fixture 27 Rear End Screw Hole 28 Rear Surface Counterbore

Claims

1. Floor slabs, left and right side wall panels, rear wall panels, and ceiling panels, each individually manufactured by a precast method using low-carbon concrete containing cement, finely powdered blast furnace slag, and fly ash, A concrete housing formed by connecting these floor slabs, left and right side wall panels, rear wall panels, and ceiling panels into a box shape with an opening at the front, A front wall that closes the front opening of the concrete housing and has an entrance / exit that is closed by an opening / closing door that can be opened and closed, and uses heat-resistant tempered glass for at least a part thereof, A water repellent applied to the outer surface of the concrete housing, A heat insulating material provided inside the left and right side wall panels, rear wall panel, and ceiling panel of the concrete housing, Wood provided inside the heat insulating material, and A concrete sauna characterized in that a sauna room is formed by the concrete housing and the front wall.

2. The concrete sauna according to Claim 1, characterized in that the cement, finely powdered blast furnace slag, and fly ash are blended at a blending ratio of 30 to 60% by mass, 30 to 60% by mass, and 10 to 15% by mass, respectively.

3. A connecting rod extending in the vertical direction, fixed to the floor slab and the ceiling panel at fixing parts formed at least at both the upper and lower sides, An insertion hole extending in the vertical direction for inserting the connecting rod is formed, and the left and right side wall panels located between the floor slab and the ceiling panel, The concrete sauna according to Claim 1, further comprising a rear wall fixing tool for fixing the rear wall panel to the rear ends of the floor slab, ceiling panel, and left and right side wall panels.

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