Floor structure with built-in heating element and construction method for floor structure with embedded heating element

Abstract

To provide a heating element embedded floor structure and a method thereof allowing protection for a heating element to be embedded to be securely performed.SOLUTION: A heating element embedded floor structure 10 comprises a base part 1 made of a cement used product such as concrete, a heating block 2 made of a cement used block mounted on the base part 1, in which a heating element is embedded, a part 6 to be covered made of a cement used product covering the heating element 2, wherein a state where the heating block 2 is buried with the base part 1 and the part 6 to be covered is formed.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a floor structure with a built-in heating element and a method for constructing a floor structure with an embedded heating element, and particularly relates to a technology for forming a floor structure with a built-in heating element in industrial refrigerators, food factories, seafood processing factories, kitchens, etc.

Background Art

[0002] In industrial refrigerators, with the increase in the size of equipment, in order to improve the storage efficiency of articles, transportation is carried out by forklifts. As the frequency of use increases, the damage to the floor surface inside the warehouse increases. Especially near the entrance and exit, since the temperature difference between inside and outside the warehouse is large and the passage frequency of forklifts is high, the damage is severe and icing often occurs. This increases the risks such as accidents during forklift operation, cargo collapse, personal accidents, and damage to the heat insulation door.

[0003] Previously, in response to this, floor heaters were embedded during construction work. However, when the floor heater needed to be replaced due to damage or the like, there was a problem that the operation of the refrigerator had to be stopped for a long time due to the replacement work. To solve such a problem, the applicant developed a concrete block (concrete heater) with a built-in heating element and devised a construction method using this to construct the floor (Japanese Patent Publication No. 1-14367, "Method for Manufacturing a Concrete Heater"). This not only solved the problem of long-term operation stoppage during replacement, but also realized shortening of the construction time and cost reduction.

[0004] However, since there were various problems such as further increasing the utilization efficiency of heat generation used in the floor heating system, increasing the strength, and making it easier to demold during manufacturing and excellent in workability, the applicant further devised an improved technology (Patent Document 1 cited below). That is, in a concrete block incorporating a heating element, in order to prevent heat dissipation from the lower surface, it is mainly a devise to provide a heat insulation structure formed as a heat insulation paint layer by a heat insulation paint applied to a mold release facilitation layer made of a non-woven fabric or a glass fiber cloth provided on the lower surface of the block.

[0005] In addition, a floor structure incorporating a heating element that can increase the possibility of being used with minimal repair even when damaged by an earthquake or other disasters and minimize the damage was also devised (Patent Document 2 cited below). That is, it is a floor structure formed by laying a plurality of concrete blocks incorporating heating elements, and the circuits constituting the heating elements are provided independently for each heating element-incorporating concrete block. In addition, each wire lead-out part is formed using a flexible structural member that is easy to deform and difficult to break.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0007] Thus, the applicant has provided a plurality of improved technologies for the floor structure with a built-in heating element, but there are still issues to be further considered. That is about the protection of the heating element built into the floor structure. In floor construction, a layer of finishing material for the purpose of preventing mold etc. is provided on the outermost surface of the floor. The finishing material layer is directly traveled on by an object having a load equivalent to that of a forklift etc. on it, and the finishing material layer directly receives the impact caused by the placement or dropping of heavy objects. Therefore, a finishing material with appropriate strength (bending strength, compressive strength) is used. And usually, in the lower structure of the finishing material, a material with lower strength than the finishing material is constructed based on the idea that the same strength as the finishing material is not required.

[0008] However, in the floor structure with a built-in heating element, the heating element is built in below the finishing material layer. Therefore, in order to fully protect it, it is desirable that the layer around the heating element has sufficient strength. Also, having appropriate strength in the lower layer leads to reducing or preventing damage or breakage of the lower layer even if the finishing material is damaged or broken due to load or impact. However, such floor structure construction technology has not been provided yet.

[0009] Therefore, the problems to be solved by the present invention are, based on such a prior art situation, to provide a floor structure with a built-in heating element that can fully protect the built-in heating element, and its construction method. Another problem of the present invention is to provide a floor structure with a built-in heating element that can effectively reduce or prevent damage or breakage of the lower layer even if the finishing material forming the outermost surface of the floor structure is damaged or broken due to load or impact, and its construction method.

Means for Solving the Problems

[0010] As a result of studying the above problems, the inventor of the present application has found that it is possible to solve the problems by manufacturing a block with a built-in heating element, that is, a heating block, using a predetermined cement-based product, and providing a layer that protects the heating block from above and below using a cement-based product with such specifications when forming a floor structure. Based on this, the present invention has been completed. That is, the invention claimed in the present application, or at least the disclosed invention, as a means for solving the above problems is as follows.

[0011] 〔1〕 A floor structure with a built-in heating element, comprising a base portion made of a cement-based product, a heating block which is a block made of a cement-based product with a built-in heating element placed on the base portion, and a covering portion made of a cement-based product covering the heating block. and The heating block is in a state of being embedded by the base portion and the covering portion, The base portion and the covering portion have a compressive strength greater than that of the heating block, A finishing material portion is provided on the covering portion, and the covering portion has a greater compressive strength than the finishing material portion, There is no gap between the base portion and the lower surface of the heating block, and they are in close contact. Among the portions of the base portion where the heating block is not placed, they are formed to be raised higher than the portions where the heating block is placed Characterized in that.

[0012] 〔 2 〕 The compressive strength of any of the base portion, the heating block, and the covering portion is 70 N / mm 2 or more. Characterized in that, 〔 1 〕 The floor structure with a built-in heating element according to 〔 〔 3 〕 The composition of the cement-based products used for the base portion, the heating block, and the covering portion is the same. Characterized in that, 〔1〕、〔2〕 The floor structure with a built-in heating element according to any of 〔 4 〕 As at least any one of the cement-based products for the base portion, the heating block, or the covering portion, 60 N / mm 2 It is a cement-using product capable of achieving a compressive strength of 60 N / mm or more MUG Crete ( Registered trademark ) is used. Characterized in that, 〔1〕、〔2〕 The floor structure with a built-in heating element according to any of 〔 5〕 A construction method for obtaining a floor structure in which a heating block, which is a cement-using product block with a built-in heating element, is embedded, A base material placing process for placing a base material made of a cement-using product, that is, a base material for forming a base part made of a cement-using product, on the surface where the floor structure is to be provided, Next, while the base portion material placed during the process of placing the base portion material has not hardened, A heating block placing process for placing the heating block on the base material, Next, A covering material placing process for placing a covering material made of a cement-using product, that is, a covering material for forming a covering part made of a cement-using product, on the heating block and Next, it includes a finishing process of providing a finishing material portion, With such a configuration, the following <f>The described heating element embedded floor structure is obtained< / f> Characterized by the above, a construction method for a floor structure with an embedded heating element. <f>The heating block is in a state of being embedded by the base portion and the covering portion,< / f> The base portion and the covering portion have a compressive strength greater than that of the heating block, A finishing material portion is provided on the covering portion, The covering portion has a greater compressive strength than the finishing material portion, There is no gap between the base portion and the lower surface of the heating block, and they are in close contact. Among the portions of the base portion where the heating block is not placed, they are formed to be raised higher than the portions where the heating block is placed. A heating element embedded floor structure.

[0013] 〔 6 〕 The composition of the cement-using products used for the base part, the heating block, and the covering part is the same, characterized by the above, 5 The construction method for a floor structure with an embedded heating element according to 〔 〔 7 〕 As at least one of the cement-using products for the base part, the heating block, or the covering part, 60 N / mm 2 It is a cement-using product capable of achieving a compressive strength of 60 N / mm or more MUG Crete ( Registered trademark ) is used, characterized by the above, 〔5〕、〔6〕 The construction method for a floor structure with an embedded heating element according to any one of 〔 8 〕 In at least one of the base part or the covering part, the following 、 or <c>Characterized by being able to obtain the compressive strength shown in at least any one of 〔5〕、〔6〕、〔7〕 The heating element embedded floor structure construction method according to any one of < / c> The material age is within 3 hours and 25 N / mm 2 or more The material age is 30 N / mm within 24 hours 2 or more <c>Within 28 days of the material age, 60 N / mm 2 or more

Advantages of the Invention

[0014] Since the heat-generating element built-in floor structure and the heat-generating element embedded floor structure construction method of the present invention are configured as described above, unlike the conventional ones, the structure incorporating the heat-generating block does not have a lower strength than the heat-generating block. Therefore, the heat-generating element built under the floor can be perfectly protected. Further, even if the finishing material forming the outermost surface of the floor structure is accidentally damaged or destroyed due to load or impact, in the present invention, the lower layer than the finishing material can be made to have a higher strength, thereby effectively reducing or preventing damage or destruction of the lower layer, and thus the heat-generating element incorporated is also perfectly protected.

[0015] Conventionally, in a floor structure configured to use a product made of cement such as concrete, a high-strength material, for example, a finishing material of 40 to 50 N / mm 2 is used as the finishing material portion forming the outermost surface, and the structure below this is of lower strength. That is, the finishing material portion receives and buffers the impact from above to prevent destruction and damage of the lower structure. Therefore, when a load exceeding the impact resistance is applied to the finishing material portion, this will be damaged, and the lower structure will also be affected. However, according to the present invention having a configuration in which the covering portion has a greater compressive strength than the finishing material portion, the impact load applied to the finishing material portion as a line load is changed to a surface load at a predetermined dispersion angle, and the finishing material portion can receive and buffer a load that it does not have resistance to, and the lower structure below the covering portion including the heat-generating block can be protected.

[0016] Furthermore, according to the heat-generating element built-in floor structure and the heat-generating element embedded floor structure construction method of the present invention configured to use a predetermined cement-based product, usually, it takes about 28 days to stabilize the floor structure using a cement-based product, but the strength equivalent to that during 28-day curing can be obtained within a very short period, that is, within several days. Even about 3 hours after the end of each process of the construction method, there is almost no shrinkage and a considerable strength can be obtained. Therefore, the effect of shortening the construction period is remarkable.

Brief Description of the Drawings

[0017] < / c>

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Mode for Carrying Out the Invention

[0018] Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a three-view drawing showing the appearance of a configuration example of a heating block related to the floor structure with a built-in heating element of the present invention. Also, FIG. 2 is a cross-sectional view of the X-X cutting plane in FIG. 1, and FIG. 3 is a cross-sectional explanatory view conceptually showing the basic configuration of the floor structure with a built-in heating element of the present invention. As shown in these figures, the floor structure 10 with a built-in heating element is basically composed of a base part 1 made of a product using cement, a heating block 2 which is a block made of a product using cement with a built-in heating element placed on the base part 1, and a covering part 6 made of a product using cement covered on the heating block 2. As shown in FIG. 3, the floor structure 10 with a built-in heating element has a structure in which the heating block 2 is embedded by the base part 1 and the covering part 6. The heating block 2 is effective for preventing freezing of the floor surface and the like.

[0019] As shown in Fig. 2, the heating block 2 incorporated in the heat-generating body built-in floor structure 10 basically has a structure in which the heating element 3 is incorporated in a cement-using product part 5 formed by curing a cement-using product. As the heating element 3, an electric heater can be preferably used. Further, it can also be configured to include a heat insulation structure 4 for preventing heat dissipation from the lower surface. In this case, the heat insulation structure 4 can be, for example, a structure formed by using a heat insulation paint 4b on the lower surface of the block 2. Further, the heat insulation paint 4b may be configured to be applied to a mold release facilitation layer 4a provided on the lower surface of the block 2. In this case, as the mold release facilitation layer 4a, a non-woven fabric or a glass fiber cloth can be preferably used.

[0020] As the heat-generating body built-in floor structure 10 of the present invention, both the structure aspect of the constructed floor and the aspect of the floor structure product formed in a predetermined dimension are applicable. The former is a structure formed by a predetermined construction method. On the other hand, the latter can take the form of a basic product for constructing a floor structure with a built-in heating element, which is manufactured by a predetermined manufacturing method and standards. By using a plurality of such basic products and laying them on-site, a desired floor structure with a built-in heating element is formed.

[0021] The base part 1 and the covering part 6 of the heat-generating body built-in floor structure 10 can be configured to have a compressive strength equal to or higher than that of the heating block 2 or more. That is, the base part 1 and the covering part 6 may have the same compressive strength as the heating block 2, or may have a compressive strength greater than that of the heating block 2. With such a configuration, the base part 1 and the covering part 6 can withstand impacts from the surroundings such as impact loads from above with a compressive strength equal to or higher than that of the heating block 2 or more.

[0022] Fig. 4 is a sectional explanatory view of a main part showing another configuration example of the heating block according to the heat-generating body built-in floor structure of the present invention. As shown in the figure, the heating block 12 is mainly formed of concrete 15c, and fiber-reinforced concrete or fiber-reinforced mortar 15d can also be used for a part or the whole. Further, it is desirable that the heating element 13 has a structure reinforced by a reinforcing structure. For example, as shown in the figure, reinforcing bars 17f and Mesh ribs 17e rebars such as can be preferably used.

[0023] FIG. 5 is a cross-sectional explanatory view conceptually showing the basic configuration of the heat-generating body built-in floor structure of the present invention provided with a finishing material portion. As shown in the figure, the finishing material portion 8 can be provided on the covering portion 6 of the heat-generating body built-in floor structure 210, and further, the covering portion 6 can have a greater compressive strength than the finishing material portion 8. The finishing material is formed for the purpose of wear resistance, impact resistance, and mold prevention. In particular, in order to obtain sufficient impact resistance, a material having a compressive strength or compressive stress of 40 to 50 N / mm 2 or so is used.

[0024] In the heat-generating body built-in floor structure 210, in addition to providing the finishing material portion 8 having such impact resistance and the like, the compressive strength or compressive stress of the covering portion 6 and the base portion 1, which are the lower structures thereof, can be made larger than that of the finishing material portion 8. As a result, the impact load applied to the finishing material portion 8 as a line load is changed to a surface load at a predetermined dispersion angle such as 45°, and the finishing material portion 8 can receive a load having no resistance and relieve this, effectively protecting the lower structure below the covering portion 6 including the heat-generating block 2. Therefore, the effect of preventing the destruction and damage of the heat-generating block 2 is high.

[0025] For example, as described above, the compressive strength of the conventional finishing material is about 40 to 50 N / mm 2 or so, but the compressive strength of the base portion 1, the heat-generating block 2, and the covering portion 6 of the heat-generating body built-in floor structure 210 can all be made more than 60 N / mm 2 or more, or 70 N / mm 2 or more, which greatly exceeds that of the finishing material portion 8. The compressive strength of the base portion 1, the heat-generating block 2, and the covering portion 6 may all be equal, or as described above, the first two may be formed with a greater compressive strength. On the other hand, an example in which the first two are formed with a compressive strength smaller than that of the heat-generating block 2 is not excluded from the present invention.

[0026] In addition, the cement-based products used for the base portion 1, the heating block 2, and the coating portion 6 can have the same composition. By using cement-based products with the same composition for any part, the manufacturing process of the heat-generating body built-in floor structure 10 and the like can be further simplified. Also, thereby, all of the base portion 1, the heating block 2, and the coating portion 6 can have the same compressive strength.

[0027] As the cement-based product used for the heat-generating body built-in floor structure 10 and the like, MUG Crete ( Registered trademark ), M·U·G Crete ( Registered trademark trademarks similar thereto) (hereinafter, "MUG Crete ( Registered trademark ) etc.") can be preferably adopted. MUG Crete ( Registered trademark ) etc. is a cement-based product that can achieve a compressive strength of 60 N / mm 2 or more, which greatly exceeds the compressive strength of the conventionally used finishing materials. Moreover, since stable strength can be obtained in a very short period with almost no shrinkage, it is optimal for the present invention.

[0028] MUG Crete ( Registered trademark ) etc. may be used for any one or two of the base portion 1, the heating block 2, or the coating portion 6, but it is more desirable to commonly use them in all elements constituting the heat-generating body built-in floor structure 10 and the like of the present invention. That is, it is recommended to use MUG Crete ( Registered trademark ) etc. as both the cement-based product for forming the base portion 1 and the coating portion 6 and the cement-based product for manufacturing the heating block 2 in order to sufficiently obtain the intended effects of the present invention.

[0029] Fig. 6 is a flowchart showing the basic configuration of the method for constructing a floor structure with embedded heating elements according to the present invention. Below the dashed line in the figure are the elements used in each process of this flow. As shown in the figure, the method for constructing a floor structure with embedded heating elements is a method for obtaining a floor structure 10 in which heating blocks, which are cement-based products incorporating heating elements, are embedded. The method mainly comprises a process P1 of placing a base material 1B made of a cement-based product for forming a base part on the surface where the floor structure is to be provided, a process P2 of placing heating blocks 2 on the base material 1B, and a process P3 of placing a covering material 6C made of a cement-based product for forming a covering part on the heating blocks 2.

[0030] According to the method of this configuration, first, in the process P1 of placing the base material, the base material 1B made of a cement-based product for forming a base part is placed on the surface where the floor structure is to be provided. Then, in the process P2 of placing the heating blocks, the heating blocks 2 are placed on the base material 1B. Next, in the process P3 of placing the covering material, the covering material 6C made of a cement-based product for forming a covering part is placed on the heating blocks 2. The base material 1B placed at the bottom hardens to become the base part 2 with the heating blocks 2 placed thereon, and the covering material 6C placed on the heating blocks 2 hardens to become the covering part 6. Finally, the floor structure 10 with the heating blocks 2 embedded is obtained.

[0031] In the method for constructing a floor structure with embedded heating elements, it is desirable that the process P2 of placing the heating blocks is carried out before the base material 1B placed in the process P1 of placing the base material hardens. By doing so, the generation of a gap between the base part 1 and the lower surface of the heating blocks 2 can be prevented, a structure in which both are in close contact can be obtained, and the strength of the entire floor structure can be further enhanced. Note that the portion of the base part 1 where the heating blocks 2 are not placed is formed to be slightly raised as shown in Fig. 3 and the like above.

[0032] FIG. 7 is a flowchart showing another configuration of the method for constructing a floor structure with a heating element of the present invention. In the method of the present invention shown in the figure, a finishing process P4 for providing a finishing material portion 8 is provided after the process P3 of placing the covering material. Thereby, a floor structure 210 with a heating element having a finishing material portion 8 is obtained. In the process P3 of placing the covering material, a covering material 6C is used such that a structure having a compressive strength greater in the covering portion 2 than in the finishing material portion 8 after completion of the floor structure 210 can be obtained. Not only the covering material 6C but also the base material 1B can be of such a specification. The same applies to products made of cement for the heating block 2.

[0033] In addition, in the methods shown in FIGS. 6 and 7, the compositions of the cement-based products used for the base portion 1, the heating block 2, and the covering portion 6 can be the same. Further, as the cement-based product for at least any one of the base portion 1, the heating block 2, or the covering portion 6, MUG Crete ( Registered trademark ) etc. can be preferably used. Using MUG Crete ( Registered trademark ) etc. as all the cement-based products is optimal in the method of the present invention.

[0034] The floor structure 10 etc. with a heating element obtained by the method of the present invention has a characteristic compressive strength. It is as follows ? <c>is the compressive strength shown in at least any one of them. < / c> Within 3 hours of the material age, 25 N / mm 2 or more Within 24 hours of the material age, 30 N / mm 2 or more <c>60N / mm within 28 days 2 End Such characteristics are the same as those of the MUG cleat ( Registered trademark ) can be obtained by using [Example]

[0035] An example of the present invention will be described below, but the present invention is not limited to this example. Figure 8 is a cross-sectional view illustrating an embodiment of a floor structure with a built-in heater according to the present invention. As shown in the figure, the floor structure with a built-in heater 310 according to this embodiment has a heat-generating block 32 buried between a base section 31 and a covering section 36, with a finishing material section 38 provided on the surface. This structure is formed at the construction site using a specified cement-based product, heat-generating block, and finishing material. While the figure shows numbers indicating dimensions such as "600" and "40," these are merely examples, and the present invention is not limited to these specifications. The same applies to numbers indicating compressive strength such as "74.8." Furthermore, "σc" is the compressive stress level.

[0036] As a cement-based product for forming the base part 31, the covering part 36, and for manufacturing the heat generating block 31, MUGcrete ( Registered trademark ) was used. In the figure, M·U·G cleat ( Registered trademark (Trademarks similar to MUG Cleats) Registered trademark ) is a product made by mixing a specified cement product, a water-reducing agent, and a specified aggregate in a specified ratio. When used, water is added to it and it is kneaded to form a soft paste.

[0037] Heat Compal (registered trademark of Hiyori Japan Co., Ltd.) was used as the heat generating block 32. Registered trademark )of used It is a secondary product made of a material with a built-in heating element. An example of its structure is shown in Figure 4 above. The compressive strength or compressive stress is 74.8 N / mm 2 This is 1.46 times the normal finish. or It is 1.88 times stronger.

[0038] The construction method first places MUG concrete ( Registered trademark ) at a predetermined depth on-site for the base part 31. Before it hardens, the heating block 32·Heat Compal (registered trademark) is placed on it. Then, MUG concrete ( Registered trademark ) is placed at a predetermined depth for the covering part 36 to proceed. Note that the numbers on the right side of the figure indicating the depth (thickness) are just examples and are not limited to this is not used

[0039] After the covering part 36 hardens, the finishing material part 38 is constructed on it with an appropriate thickness. As the finishing material, appropriate ones such as those made by Atmix and BASF are used. Generally, it has a compressive strength or compressive stress of about 40 - 50 N / mm 2 . That is, the lower structure composed of the base part 31 - heating block 32 - covering part 36 has a strength 1.46 - 1.88 times that of the finishing material.

[0040] When an impact load P is applied vertically downward from above the heat - generating body - incorporated floor structure 310, this becomes a surface load at a dispersion angle of 45° on the surface part of the heat - generating body - incorporated floor structure 310. The impact load is supported by the surface, and the lower structure has a high strength of 74.8 N / mm 2 which greatly exceeds the finishing material part 38, and the effect of preventing the destruction and damage of the built - in heating block 32 is sufficient.

[0041] In addition, a physical test of the MUG concrete ( Registered trademark ) used in the example was conducted. The results are described below. Although they are two test examples with different test methods, in any case, the compressive strength that usually requires a material age of 28 days was obtained in about 3 hours for the MUG concrete ( Registered trademark ), indicating that it cures quickly. Moreover, the cured state was almost non - shrinking.

[0042]

Table 1

[0043]

Table 2

Industrial Applicability

[0044] According to the heat-generating element built-in floor structure and the heat-generating element embedded floor structure construction method of the present invention, the protection of the heat-generating element built under the floor can be perfectly achieved. Moreover, the construction period can be significantly shortened. Therefore, it is an invention with high industrial applicability in the field of floor construction in industrial refrigerators, food factories, seafood processing factories, kitchens, etc., and all related fields.

Explanation of Reference Numerals

[0045] 1, 31... Base part 1B... Base part material 2, 12, 32... Heating block 3, 13... Heating element 4, 14... Heat insulation structure 4a, 14a... Release facilitation layer 4b, 14b... Heat insulation paint layer 5... Cement product part 15c... Concrete 15d... Fiber-reinforced concrete or fiber-reinforced mortar 6, 36... Coating part 6C... Coating part material 8, 38... Finishing material part 10, 210, 310... Heat-generating element built-in floor structure (heat-generating element embedded floor structure) 17e... Mesh reinforcement 17f... Reinforcing bar P1... Base part material placement process P2... Heating block placement process P3... Coating part material placement process P4... Finishing process< / c>

Claims

1. It consists of a base part made of a cement-using product, a heating block which is a cement-using product block with a built-in heating element placed on the base part, and a covering part made of a cement-using product covering the heating block, the heating block is in a state of being embedded by the base part and the covering part, the base part and the covering part have a compressive strength higher than that of the heating block, a finishing material part is provided on the covering part, and the covering part has a compressive strength higher than that of the finishing material part, there is no gap between the base part and the lower surface of the heating block and they are in close contact, and the part of the base part where the heating block is not placed is formed to bulge more than the part where the heating block is placed, characterized in that it is a floor structure with a built-in heating element.

2. The compression strength of any of the base portion, the heating block, and the covering portion is 70 N / mm ２ or more, and the heating body built-in floor structure according to claim 1, characterized in that.

3. The composition of the cement-using products used for the base part, the heating block, and the covering part is the same, characterized in that it is the floor structure with a built-in heating element according to any one of Claims 1 and 2.

4. As the cement-using product of at least any one of the base part, the heating block, or the covering part, MUG Crete (registered trademark), which is a cement-using product capable of achieving a compressive strength of 60 N / mm2 or more, is used, characterized in that it is the floor structure with a built-in heating element according to any one of Claims 1 and 2.

5. A method for obtaining a floor structure in which a heating block, which is a cement-using product block with a built-in heating element, is embedded, a process of placing a base part material, which is a cement-using product for forming a base part made of a cement-using product, on the surface where the floor structure is provided, that is, a base part material placing process, then, a heating block placing process of placing the heating block on the base part material before the base part material placed in the base part material placing process hardens, then, a covering part material placing process of placing a covering part material, which is a cement-using product for forming a covering part made of a cement-using product, on the heating block, then, it includes a finishing process of providing a finishing material part, characterized in that the floor structure with a built-in heating element described in <F> below can be obtained by such a configuration. A method for a floor structure with a built-in heating element, characterized in that. <F> The heating block is in a state of being embedded by the base part and the covering part, the base part and the covering part have a compressive strength higher than that of the heating block, a finishing material part is provided on the covering part, The coating portion has a greater compressive strength than the finishing material portion. A heating element embedded floor structure in which there is no gap between the base portion and the lower surface of the heating block and they are in close contact, and the portion of the base portion where the heating block is not placed is formed to bulge more than the portion where the heating block is placed.

6. The method for constructing a heating element embedded floor structure according to claim 5, characterized in that the compositions of the cement products used for the base portion, the heating block, and the coating portion are the same.

7. The method for constructing a heating element embedded floor structure according to any one of claims 5 and 6, characterized in that MUGcrete (registered trademark), which is a cement product capable of achieving a compressive strength of 60 N / mm2 or more, is used as the cement product for at least any one of the base portion, the heating block, or the coating portion.

8. The method for constructing a heating element embedded floor structure according to any one of claims 5, 6, and 7, characterized in that in at least any one of the base portion or the coating portion, a compressive strength shown in at least any one of the following , , or <C> can be obtained. Within 3 hours of the material age, 25 N / mm ２ or more Within 24 hours of the material age, 30 N / mm ２ or more <C> Material age within 28 days, 60 N / mm ２ or more

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