Floor heater device

Abstract

To provide a floor heater device that has high electrical heating efficiency and is easy to maintain. [Solution] The present invention has a floor heater unit that is detachably housed in a recess in the floor surface of the entrance of a freezer / refrigerated warehouse. The floor heater unit comprises a frame housed in the recess, a checkered steel plate detachably placed on the frame and closing the upper surface of the recess, a floor heater provided below the checkered steel plate, a first insulating material provided below the floor heater, a support steel plate provided below the first insulating material, and a second insulating material provided below the support steel plate. The floor heater unit is housed in the frame in the order of floor heater, first insulating material, support steel plate, and second insulating material, forming multiple layers from top to bottom. The frame is integrally formed with the checkered steel plate by fixing means in a manner that houses the floor heater, first insulating material, support steel plate, and second insulating material.

Description

Technical Field

[0001] The present invention relates to a floor heater device for preventing freezing of the floor surface at the entrance and exit of a refrigerated or frozen warehouse.

Background Art

[0002] Conventionally, in an air-conditioned warehouse (for example, a refrigerated or frozen warehouse, hereinafter referred to as a warehouse), workers carry in and out goods using a cargo handling vehicle (hereinafter referred to as a forklift). The entrance and exit of the warehouse are shielded by an opening and closing shutter to maintain a constant temperature inside the warehouse. Therefore, when the shutter is opened with the loading and unloading of goods by the forklift, air containing moisture flows into the warehouse, and the floor surface near the entrance and exit of the warehouse is partially frozen as the inflowing air is cooled. When such partial freezing occurs on the floor surface near the entrance and exit of the warehouse, the straight-line stability of a trolley or forklift passing through the entrance and exit is impaired, and there is a risk of collision with the door, wall surface, etc. constituting the entrance and exit of the warehouse.

[0003] To solve such problems, there is a method of embedding a heater (for example, an electric heater) in the floor surface of the entrance and exit of the warehouse and warming the floor surface to prevent freezing of the floor surface corresponding to the travel route of the forklift. However, in such a method, the heater may malfunction due to the vibration of a trolley or forklift traveling above, or the wiring supplying power to the heater may be disconnected. In addition, since the heater is a consumable item, regular replacement of parts is required to maintain its normal function. In order to replace or repair the heater and wiring embedded in the floor surface in this way, it is necessary to remove the concrete on the floor surface, replace the corresponding heater and wiring, and then pour the concrete again, which not only requires a large-scale construction but also increases the construction period and cost.

[0004] To solve the above-mentioned problems, Patent Document 1 discloses a device for preventing freezing of the periphery of a warehouse entrance, in which a support base having multiple floor heaters is fixed to the floor surface of the warehouse entrance, the support base is covered from above with a protective cover, and the device is fixed so that the upper surface of the protective cover and the upper surface of the warehouse entrance floor are flush.

[0005] Furthermore, Patent Document 2 discloses a floor heater device comprising a frame fixed to the ground or floor surface with an open top, a grating having a plurality of grooves, a heater fitted into at least a portion of the plurality of grooves provided in the grating, and a plate-shaped member placed on top of the grating and provided to close the opening in the ground or floor surface. With such a configuration, it is stated that the heater housed in the ground or floor surface can be replaced simply by removing the plate-shaped member that closes the opening in the ground or floor surface. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 9-133452 [Patent Document 2] Patent No. 7369408 [Overview of the project] [Problems that the invention aims to solve]

[0007] However, the floor heater device described in Patent Document 1 has a problem in that, because the support base equipped with the heater is fixed to the floor surface of the warehouse entrance, if the support base is warped by heavy objects such as forklifts, it takes a long time to replace the support base.

[0008] Furthermore, in the floor heater device described in Patent Document 2, the heater is exposed simply by removing the plate-shaped member placed on the grating, making it easy to replace the heater housed in the chipped-out section of the floor. However, because the heater is supported by sand, the heat generated by the heater escapes downwards, hindering efficient heat transfer to the plate-shaped member.

[0009] Furthermore, in the floor heater device described in Patent Document 2, a portion of the heater is in contact with a plate-shaped member, and the heater is supported by sand. Therefore, when the plate-shaped member is pressed down by a heavy object such as a forklift and bends downward, if the heater is pressed down by the plate-shaped member, the contact between the heater and the plate-shaped member is lost, which reduces the heat transfer efficiency from the heater to the plate-shaped member and may prevent the plate-shaped member from being heated to a certain temperature.

[0010] Furthermore, in the floor heater device described in Patent Document 2, since the heater is supported by sand, there is a risk that the sand supporting the heater may scatter around the device or onto the warehouse floor during heater replacement work, potentially complicating maintenance work.

[0011] Furthermore, the floor heater device described in Patent Document 2, like the floor heater device described in Patent Document 1, has a frame that forms the device fixed to a recess formed in the floor surface of the storage entrance. Therefore, if the frame becomes distorted, there is a problem that it takes a long time to replace the floor heater device.

[0012] This invention has been made in view of the above-mentioned problems, and aims to provide a floor heater device that has high heat transfer efficiency and is easy to maintain. [Means for solving the problem]

[0013] A first aspect of the present invention is a floor heater device installed on the floor surface of an entrance to a cold storage warehouse for storing goods to be kept at low temperatures, the device having a floor heater section that is detachably housed in a recess in the floor surface, the floor heater section comprising a frame housed in the recess, a checkered steel plate detachably placed on the frame and closing the upper surface of the recess, a floor heater provided below the checkered steel plate, a first insulating material provided below the floor heater, a support steel plate provided below the first insulating material, and a second insulating material provided below the support steel plate, wherein the floor heater section is housed in the frame in the order of the floor heater, the first insulating material, the support steel plate, and the second insulating material, forming multiple layers from top to bottom, and the frame is integrally formed with the checkered steel plate by fixing means in a manner that houses the floor heater, the first insulating material, the support steel plate, and the second insulating material.

[0014] Another aspect of the present invention further comprises a horizontal adjustment section that supports the floor heater section in a substantially horizontal position when housed in the recess, wherein the frame body comprises a frame section provided along the side wall forming the recess, and a support section erected on the opposite surface of the frame section in the storage space enclosed by the frame section, wherein the horizontal adjustment section comprises a horizontal adjustment plate placed on the bottom surface of the recess to make the frame body horizontal, and the bottom surfaces of the frame section and the support section are supported by the horizontal adjustment plate.

[0015] Another aspect of the present invention is characterized in that the checkered steel plate and the frame are fixed to the horizontal adjustment plate by the fixing means.

[0016] Another aspect of the present invention further comprises a horizontal adjustment section that supports the floor heater section in a substantially horizontal position when housed in the recess, wherein the horizontal adjustment section comprises a horizontal adjustment plate on the bottom surface of the recess for positioning the frame horizontally, and a swing restrictor placed on the horizontal adjustment plate and interposed between the frame and the side wall of the recess, characterized in that the horizontal adjustment plate and the swing restrictor are integrally formed. [Effects of the Invention]

[0017] A first aspect of the present invention is a floor heater device installed on the floor surface of an entrance to a cold storage warehouse for storing goods to be kept at low temperatures, the device having a floor heater section detachably housed in a recess in the floor surface, the floor heater section comprising a frame housed in the recess, a checkered steel plate detachably placed on the frame and closing the upper surface of the recess, a floor heater provided below the checkered steel plate, a first insulating material provided below the floor heater, a support steel plate provided below the first insulating material, and a second insulating material provided below the support steel plate. The floor heater is housed in the frame, with the floor heater, the first insulating material, the support steel plate, and the second insulating material arranged in a multilayer structure from top to bottom. The frame is integrally formed with the checkered steel plate by fixing means in such a manner that it houses the floor heater, the first insulating material, the support steel plate, and the second insulating material. Therefore, in the event of a heater failure, only the floor heater section housed in the recess of the floor surface can be replaced, thereby reducing the time required for replacing the floor heater device and improving the operational efficiency of the refrigerated and frozen warehouse.

[0018] Furthermore, because the checkered steel plate that closes the recessed opening in the floor surface of the storage area is supported by the entire frame, durability against heavy objects is improved and the likelihood of the frame becoming distorted is reduced. In addition, even if the frame becomes distorted, since the floor heater is only housed in the recessed area of ​​the floor, only the floor heater can be replaced without removing the checkered steel plate, making maintenance work on a faulty floor heater easier.

[0019] Another aspect of the present invention further comprises a horizontal adjustment section that supports the floor heater section in a substantially horizontal position when housed in the recess, the frame having a frame section provided along the side wall forming the recess, and a support section erected on the opposite surface of the frame section in the storage space enclosed by the frame section, the horizontal adjustment section comprising a horizontal adjustment plate placed on the bottom surface of the recess to make the frame a horizontal state, and with the bottom surfaces of the frame section and the support section supported by the horizontal adjustment plate, the upper surface of the checkered steel plate can be made parallel to the floor surface, the load applied from the checkered steel plate to the frame section and the support section can be evenly distributed, and deformation of the frame can be prevented.

[0020] In another aspect of the present invention, since the checkered steel plate and the frame are fixed to the horizontal adjustment plate by the fixing means, the floor heater unit can be removed from the recess simply by removing the fixing means connecting the horizontal adjustment plate and the checkered steel plate. In other words, since the fixing means can be used to switch between fixing and releasing the floor heater unit, the time required for replacing the floor heater unit can be reduced.

[0021] Another aspect of the present invention further includes a horizontal adjustment section that supports the floor heater section in a substantially horizontal position when housed in the recess, the horizontal adjustment section having a horizontal adjustment plate on the bottom surface of the recess for positioning the frame horizontally, and a swing restricting body placed on the horizontal adjustment plate and interposed between the frame and the side wall of the recess, and since the horizontal adjustment plate and the swing restricting body are integrally formed, the checkered steel plate can be positioned horizontally simply by placing the frame on the horizontal adjustment plate, the load applied from the checkered steel plate to the frame and support can be evenly distributed, and deformation of the frame can be prevented. Furthermore, because the swing restricting body is interposed between the frame and the side wall of the recess, the frame section provided inside the swing restricting body comes into contact with the inner circumferential wall surface of the swing restricting body, thereby restricting the swing of the frame in the front, back, left, and right directions, and the swing of the frame can be restricted without fixing the frame and the horizontal adjustment plate. In other words, the position of the frame within the recess can be restricted without using fixing members such as anchor bolts, the swinging of the frame can be restricted, the floor heater can be easily removed from the recess, and installation and maintenance work on the floor heater device can be easily carried out.

Brief Description of the Drawings

[0022] [Figure 1] It is a diagram showing a refrigerated and frozen warehouse where the floor heater device according to the first embodiment of the present invention is installed. [Figure 2] It is a diagram showing the installation location of the floor heater device according to the first embodiment of the present invention. [Figure 3] It is an exploded perspective view showing the configuration of the floor heater device according to the first embodiment of the present invention. [Figure 4] It is a diagram showing the configuration of the frame of the floor heater unit according to the first embodiment of the present invention, (a) is a plan view, and (b) is a cross-sectional view taken along line A-A of (a). [Figure 5] It is a cross-sectional view for explaining the configuration of the floor heater device according to the first embodiment of the present invention. [Figure 6] It is a partially enlarged cross-sectional view of FIG. 5. [Figure 7] It is a diagram showing the installation procedure of the floor heater device according to the first embodiment of the present invention. [Figure 8] It is a diagram showing the installation procedure of the floor heater device according to the first embodiment of the present invention. [Figure 9] It is an exploded perspective view showing the configuration of the floor heater device according to the second embodiment of the present invention. [Figure 10] It is a diagram showing the configuration of the floor heater device according to the second embodiment of the present invention, (a) is a plan view, and (b) is a cross-sectional view taken along line B-B of (a). [Figure 11] It is a cross-sectional view for explaining the configuration of the floor heater device according to the second embodiment of the present invention. [Figure 12] It is a partially enlarged cross-sectional view of FIG. 11. [Figure 13] It is a diagram showing the installation procedure of the floor heater device according to the second embodiment of the present invention.

Modes for Carrying Out the Invention

[0023] This invention relates to a floor heater device that supports and fixes a heater for preventing freezing installed on the floor surface of the entrance of a refrigerated or frozen warehouse. By devising the configuration of the floor heater device, it maintains high electrical heating efficiency while allowing for easy replacement of the heater even in the event of a heater failure or if the frame housing the heater becomes distorted.

[0024] The overall configuration of a floor heater device 1 according to one embodiment of the present invention will be described with reference to Figures 1 to 6. Figure 1 is a plan view showing a refrigerated / frozen warehouse S in which the floor heater device 1 is installed, and Figure 2 is an enlarged perspective view of the installation portion of the floor heater device 1. Figure 3 is an exploded perspective view showing the configuration of the floor heater device 1. Figure 4 is a diagram showing the configuration of the frame 20. Figure 5 is a schematic cross-sectional view showing the floor heater device 1 installed in the recess C. Figure 6 is an enlarged view of the portion enclosed by the dashed line in Figure 5. Hereinafter, one embodiment of the floor heater device 1 of the present invention will be described with reference to the drawings. In describing this embodiment, the directions shown in Figure 1 will be referred to as "front side," "rear side," "right side," and "left side," and "upper side" will be described as the ceiling side, and "lower side" will be described as the floor surface FL side. In other words, "front side" refers to the inside of the refrigerated / frozen warehouse S of the floor heater device 1, and "rear side" refers to the outside of the refrigerated / frozen warehouse S of the floor heater device 1.

[0025] ≪First Embodiment≫ As shown in Figures 1 to 3, the floor heater device 1 includes a floor heater unit 2 that is housed and installed in a recess C provided in the floor surface FL of the entrance SE of the refrigerated / frozen warehouse S, and a horizontal adjustment unit 3 that is installed on the bottom surface of the recess C and supports the floor heater unit 2 in a substantially horizontal position.

[0026] The floor heater section 2 includes a frame 20 housed and installed in the recess C, a checkered steel plate 21 detachably placed on the frame 20 and closing the opening of the recess C, a floor heater 22 provided below the checkered steel plate 21, a first heat insulating material 23 provided below the floor heater 22, a support steel plate 24 provided below the first heat insulating material 23, and a second heat insulating material 25 provided below the support steel plate 24.

[0027] As shown in Figure 3, the frame 20 has a frame portion 201 and a support portion 202 that is installed on the opposing surfaces of the frame portion 201.

[0028] The frame section 201 has front, rear, left, and right walls 203 that are formed in a flat, plate-like shape. The frame section 201 is formed in a substantially rectangular shape in plan view by connecting the end of one wall section 203 to the end of the adjacent wall section 203 at an orthogonal angle. The frame section 201 has a storage space 204 in the space surrounded by the front, rear, left, and right walls 203.

[0029] As shown in Figures 3 and 4, the wall 203 has an outer wall portion 203a that forms the outer periphery of the wall 203, and an inner wall portion 203b that is integrally formed with the outer wall portion 203a on the inner circumferential surface of the outer wall portion 203a.

[0030] The outer wall portion 203a is formed at a height such that its upper end is approximately flush with the floor surface FL when the frame 20 is installed in the recess C. The inner wall portion 203b is formed with its lower end approximately on the same plane as the outer wall portion 203a, and its height is lower than that of the outer wall portion 203a. In other words, the outer wall portion 203a and the inner wall portion 203b form a checkered steel plate support portion 203c for supporting the checkered steel plate 21 at the top of the wall 203.

[0031] The checkered steel plate support portion 203c has a steel plate support surface portion 203d formed at the upper end of the inner wall portion 203b, and a steel plate restricting wall surface portion 203e which is the inner circumferential surface of the outer wall portion 203a and is formed by rising vertically from the outer edge of the steel plate support surface portion 203d.

[0032] The steel plate support surface portion 203d is a flat surface formed substantially parallel to the upper surface of the outer wall portion 203a. In other words, when the frame 20 is installed in the recess C, the steel plate support surface portion 203d is formed substantially parallel to the floor surface FL. The steel plate support surface portion 203d also has an integral mounting hole portion 203f provided near the corner and a fixing hole portion 203g for fixing the checkered steel plate 21 to the frame 20.

[0033] The integrated hole 203f is formed to penetrate the steel plate support surface 203d from the upper end to the lower end with a substantially constant diameter. By inserting a fixing means 40 such as a bolt through this integrated hole 203f and screwing its tip into the horizontal adjustment plate 30 which constitutes the horizontal adjustment part 3 described later, the checkered steel plate 21 and the frame 20 are housed and fixed in the recess C. The bolt inserted through the integrated hole 203f has its head housed in the counterbore portion of the checkered steel plate 21 and is provided so as not to protrude from the upper surface of the checkered steel plate 21.

[0034] Multiple fixing holes 203g are provided at equal intervals between adjacent integral fixing holes 203f on the steel plate support surface 203d. In plan view, the fixing holes 203g are formed in a substantially circular shape, and female threads are screwed onto their inner circumferential surface. This allows the checkered steel plate 21 and the frame 20 to be fixed together by screwing the tip of a fixing member, such as a bolt inserted through the checkered steel plate 21, into the fixing hole 203g. The head of the bolt screwed into the fixing hole 203g is housed in the counterbore portion of the checkered steel plate 21, so as not to protrude from the upper surface of the checkered steel plate 21.

[0035] The steel plate restricting wall portion 203e is formed on the upper part of the inner circumferential surface of the outer wall portion 203a. The steel plate restricting wall portion 203e is formed on all outer wall portions 203a that constitute the front, rear, left, and right walls 203, and is formed in a substantially rectangular shape in plan view. In plan view, the steel plate restricting wall portion 203e is formed to be slightly larger than the outer shape of the checkered steel plate 21. As a result, when the checkered steel plate 21 is supported by the steel plate support surface portion 203d, the checkered steel plate 21 can be easily placed on the upper surface of the steel plate support surface portion 203d, which is inside the steel plate restricting wall portion 203e. In other words, the steel plate restricting wall portion 203e functions as a swing restricting wall to restrict the swinging of the checkered steel plate 21 placed on the steel plate support surface portion 203d in the front, rear, left, and right directions.

[0036] As shown in Figures 3 and 4, the support section 202 includes a checkered steel plate support 205 erected on the front and rear wall bodies 203, 203 that constitute the frame section 201, and a support steel plate support 206 provided on the checkered steel plate support 205.

[0037] As shown in Figures 4 and 5, the checkered steel plate support 205 is formed in a rectangular cylindrical shape with a roughly square shape and a hollow interior in cross-sectional view. The checkered steel plate support 205 is provided approximately parallel to the left and right walls 203, 203. Furthermore, the checkered steel plate support 205 is formed at approximately the same height as the vertical height of the inner wall portion 203b of the wall portion 203 that constitutes the frame portion 201. In other words, the upper surface of the checkered steel plate support 205 and the steel plate support surface portion 203d of the upper surface of the inner wall portion 203b are located on approximately the same horizontal plane. As a result, the checkered steel plate 21 placed on the upper surface of the frame portion 201 can be supported by the steel plate support surfaces 203d of the front, rear, left, and right walls 203, 203, 203, 203 and the checkered steel plate support 205 provided approximately parallel to the left and right walls 203, 203. Therefore, by configuring the frame 20 in this way, the load generated on the upper surface of the frame 20 is distributed to the steel plate support surface portion 203d of the wall 203 and the checkered steel plate support 205, thereby improving the rigidity of the frame 20.

[0038] Furthermore, multiple checkered steel plate supports 205 are provided to divide the storage space 204, surrounded by the front, rear, left, and right walls 203, into multiple heating spaces 207. In this embodiment, a configuration in which six checkered steel plate supports 205 are provided on the left and right walls 203, 203 is illustrated. However, the number of checkered steel plate supports 205 is not limited to six, and any number may be configured as long as the storage space 204 is divided into multiple heating spaces 207 and the checkered steel plate 21 does not flex when a forklift F or trolley passes over it.

[0039] As shown in Figure 6, the support steel plate support 206 is provided approximately in the center of the checkered steel plate support 205 in the vertical direction. The support steel plate support 206 has a support steel plate support portion 206a that extends approximately horizontally toward the adjacent checkered steel plate support 205, and a fixing portion 206b that is bent 90 degrees downward from the base end of the support steel plate support portion 206a and extends in a direction along the vertical direction of the checkered steel plate support 205. The support steel plate support 206 is formed in an inverted "L" shape in cross-sectional view by the support steel plate support portion 206a and the fixing portion 206b. The support steel plate support 206 is fixed by inserting fixing means such as bolts through the fixing portion 206b and screwing the tip of the bolts into the side surface of the checkered steel plate support 205.

[0040] The frame 20 is formed in this manner, and the checkered steel plate 21 is placed on the upper surface of the frame 20. Fixing means 40 such as bolts are inserted through the integral holes 203f, and their ends are screwed into the horizontal adjustment plate 30, thereby allowing the floor heater device 1 to be fixed in the recess C while being integrated with the checkered steel plate 21.

[0041] The checkered steel plate 21 is a rectangular steel plate with a continuous anti-slip treatment on its surface. The checkered steel plate 21 has holes 210 for inserting fixing means 40 such as bolts at positions corresponding to the steel plate support surface portion 203d and the checkered steel plate support 205. These holes 210 have counterbores to prevent the heads of the bolts inserted into the holes from protruding upward from the checkered steel plate 21. The checkered steel plate 21 is placed on the upper surface of the frame 20 and fixed to the frame 20 and the horizontal adjustment plate 30 by the fixing means 40 while closing the opening of the recess C provided in the floor surface FL. This configuration allows the storage state to be maintained while maintaining the positional relationship of the various members constituting the floor heater device 1 in the storage space 204 of the frame 20. When closing the opening of the recess C, the checkered steel plate 21 is supported and fixed to the checkered steel plate support 205 and the steel plate support surface portion 203d of the wall 203. The checkered steel plate 21 is fixed to the checkered steel plate support 205 and the steel plate support surface 203d using fixing means 40 such as bolts. When replacing the floor heater device 1, the checkered steel plate 21 can be removed by inserting it through the integral hole 203f of the steel plate support surface 203d and screwing the fixing means 40 into the horizontal adjustment plate 30 provided on the bottom surface of the recess C, and then screwing a suspension means such as an eyebolt into the part where the fixing means 40 was removed, thereby integrating the checkered steel plate 21 and the frame 20 and lifting the floor heater unit 2 via the eyebolt to remove it from the recess C.

[0042] The floor heater 22 is installed in a heating space 207 surrounded by front, rear, left, and right walls 203. In plan view, the floor heater 22 is a panel heater formed in the shape of a rectangular plate, and is formed to be slightly smaller than the distance between adjacent checkered steel plate supports 205 that form the heating space 207. In other words, the floor heater 22 is formed to a size that can be housed in the heating space 207. A floor heater 22 is installed in each heating space 207 (in this embodiment, six are laid). Wiring L for supplying power is exposed on the side of the floor heater 22 (see Figure 8). Power is supplied to the floor heater 22 by connecting the wiring L of the floor heater 22 to wiring that has one end connected to a power source and is located in the connection space P on the side of the floor heater 22. In other words, the floor heater 22 can switch the wiring L connected and disconnected in the connection space P provided in the cinder concrete K near the recess C. Furthermore, when replacing the floor heater device 1, the connection between the power supply wiring and the floor heater 22 wiring L can be resolved in the connection space P, allowing the floor heater device 1 to be replaced without having to consider the wiring L. In this embodiment, an electric heater or the like is preferably used as the floor heater 22.

[0043] The first insulating material 23 is preferably made of glass wool, which has excellent heat insulation and heat retention properties. The first insulating material 23 is formed in a rectangular shape with a predetermined thickness, similar to the floor heater 22 placed on top, and is provided in each heating space 207 formed between adjacent checkered steel plate supports 205. The glass wool provided as the first insulating material 23 is made of glass fibers and has an air layer trapped between the fibers. Glass wool has excellent heat insulation and heat retention properties due to the presence of the air layer, and also has elasticity. By providing the first insulating material 23 in each heating space 207 in this configuration, the heat generated by the floor heater 22 can be prevented from being transferred to the floor heater 22 below, thereby efficiently warming the checkered steel plate 21. Furthermore, because the first insulating material 23 has elasticity, the floor heater 22 placed on the first insulating material 23 can be pressed upward and brought into contact with the checkered steel plate 21. Furthermore, the first insulation material 23 has a certain elastic force, which reduces the load on the floor heater 22. In other words, even if the checkered steel plate 21 bends downward from above and presses the floor heater 22 downward, it can absorb the load on the floor heater 22. Also, because the first insulation material 23 is made of glass wool, even if sparks occur in the wiring supplying power to the floor heater 22, the flame retardancy of glass wool prevents the first insulation material 23 from burning, thus ensuring safety. Note that the first insulation material 23 is not limited to glass wool; it can be made of any material that has an air layer and possesses insulation, heat retention, and elasticity.

[0044] The support steel plate 24 is a steel plate formed in the shape of a rectangular thin plate. The support steel plate 24 is located below the first insulation material 23 and supports the first insulation material 23. A support steel plate 24 is provided in each heating space 207. The support steel plate 24 is supported by the support steel plate support portion 206a of the support steel plate support body 206. In other words, the support steel plate 24 is located approximately in the center in the vertical direction of the checkered steel plate support body 205. To put it another way, the support steel plate 24 is provided at a certain distance above the bottom surface of the recess C. The support steel plate 24 has multiple holes 241 drilled in the vertical direction (see Figure 3). As will be described in more detail later, by providing multiple holes 241 in the support steel plate 24, foamed urethane (rigid urethane foam), which is the second heat insulating material 25, can be ejected from the holes 241 between the horizontal adjustment plate 30 and the support steel plate 24, thereby forming the second heat insulating material 25 between the horizontal adjustment plate 30 and the support steel plate 24.

[0045] The second insulation material 25 is made of, for example, foamed urethane (rigid urethane foam) having a predetermined strength. The second insulation material 25 is for insulating the space between the horizontal adjustment plate 30 and the support steel plate 24. The foamed urethane provided as the second insulation material 25 has countless fine bubbles, and air is trapped inside these bubbles. The foamed urethane can effectively suppress heat conduction due to the air trapped inside the bubbles. This prevents the heat generated by the floor heater 22 from being transferred to the second insulation material 25 via the first insulation material 23, and then to the horizontal adjustment plate 30, thereby efficiently warming the checkered steel plate 21. Furthermore, because the foamed urethane, which is the second insulation material 25, is filled between the support steel plate 24 and the horizontal adjustment plate 30 through the holes 241 provided in the support steel plate 24, the foamed urethane resin adheres to the support steel plate 24 and the checkered steel plate support 205, becoming one with these components. In this case, a release agent is applied to the horizontal adjustment plate 30 in advance, so the second insulation material 25 is not adhered to the horizontal adjustment plate 30. With this configuration, the floor heater unit 2 can be easily removed from the recess C. Furthermore, the foamed urethane, which is the second insulation material 25, enters the fine irregularities formed on the surfaces of the checkered steel plate support 205, the support steel plate support 206, and the support steel plate 24, which are not coated with a release agent, and foams within these irregularities, thereby forming an integral part with the checkered steel plate support 205, the support steel plate support 206, and the support steel plate 24.

[0046] In this way, by making the floor heater section 2 a multi-layer structure using various components with different functions (checkered steel plate 21, floor heater 22, first insulation material 23, support steel plate 24, second insulation material 25), it is possible to prevent the heat generated by the floor heater 22 from being transferred to anything other than the checkered steel plate 21 placed on top of the floor heater 22, and to efficiently heat the checkered steel plate 21. Furthermore, by providing the first insulation material 23 and the second insulation material 25 below the floor heater 22 of the floor heater device 1, it is possible to prevent the heat generated by the floor heater device 1 from being transferred to anything other than the checkered steel plate 21, and the heat is transferred to the floor surface FL inside the refrigerated / frozen warehouse S, preventing the internal temperature of the refrigerated / frozen warehouse S from rising and preventing the floor surface FL at the entrance from freezing.

[0047] Furthermore, the floor heater unit 2 can be easily replaced by integrating the frame 20 and the checkered steel plate 21 into a single unit. Specifically, the frame 20 and the checkered steel plate 21 are fastened and fixed together with multiple fixing means 40, and the fixing means 40 are inserted through integral holes 203f provided in the steel plate support surface 203d. The tip of the fixing means 40 is then screwed into the horizontal adjustment plate 30, thereby fixing the floor heater unit 2 within the recess C. As a result, the floor heater unit 2 can be easily removed from the recess C and the floor heater unit 2 can be easily replaced. In this case, since the frame 20 and the checkered steel plate 21 are fixed together by other fixing means 40, the integrated state of the floor heater unit 2 is not lost. Therefore, the floor heater unit 2 described in this embodiment can be easily replaced by simply disengaging the screwed-in state with the fixing means 40 screwed into the horizontal adjustment plate 30, thereby releasing the fixed state within the recess C.

[0048] Furthermore, since the wiring L for supplying power to the floor heater 22 is configured to be connected to the power supply wiring in a connection space P formed on the floor surface FL in a different area from the recess C, it can be connected to the power supply wiring regardless of the installation work of the floor heater device 1, and the time required for replacing the floor heater unit 2 can be reduced as much as possible.

[0049] The horizontal adjustment unit 3 is located below the floor heater unit 2 and includes a horizontal adjustment plate 30 and an adjustment means for adjusting the upper surface of the horizontal adjustment plate 30 to be approximately horizontal.

[0050] The horizontal adjustment plate 30 is formed as a thin plate with a roughly rectangular shape. The horizontal adjustment plate 30 is formed to have a roughly the same outer shape as the frame portion 201 of the frame body 20. In other words, in a plan view, the outer edges of the horizontal adjustment plate 30 and the frame portion 201 coincide.

[0051] Furthermore, the horizontal adjustment plate 30 has fixing holes 31 near each corner for fixing the fixing means 40, and adjustment holes 32 for fixing to the bottom surface of the recess C while keeping the upper surface horizontal. The horizontal adjustment plate 30 can integrally fix the checkered steel plate 21 and the frame 20 by screwing the tip of the fixing means 40 into the fixing holes 31. In addition, the horizontal adjustment plate 30 allows the height of each part relative to the bottom surface of the recess C to be adjusted by screwing the adjustment means into the adjustment holes 32.

[0052] The horizontal adjustment section 3 is configured in this way, and by screwing the adjustment means into the adjustment holes 32 provided in the horizontal adjustment plate 30 to form the upper surface to be approximately horizontal, and by screwing the fixing means 40 into the fixing holes 31, the checkered steel plate 21 and the frame 20 can be integrally fixed to the horizontal adjustment plate 30.

[0053] Then, the horizontal adjustment unit 3 configured in this way is laid on the bottom surface of the recess C, its upper surface is adjusted to be approximately horizontal using the adjustment means, and it is fixed to the bottom surface of the recess C. The fixing means 40 is then screwed into the fixing hole 31, thereby completing the installation of the floor heater device 1, which consists of the floor heater unit 2 and the horizontal adjustment unit 3, inside the recess C.

[0054] ≪Construction Procedure≫ Referring to Figures 7 and 8, the installation procedure for the floor heater device 1 of the first embodiment into the recess C will be explained. Figures 7(a) to 7(c) show the procedure from installing the horizontal adjustment plate 30 in the recess C to installing the support steel plates 24 on the support steel plate support parts 206a of each heating space 207. Figures 8(a) to 8(d) show the procedure from installing the support steel plates 24 in each heating space 207 to closing the opening of the recess C with the checkered steel plate 21 and installing the floor heater device 1 in the recess C.

[0055] As shown in Figure 7(a), the floor surface FL is chipped away, the floor heater embedded in the floor surface FL is removed, and a recess C for placing the floor heater device 1 is formed at the entrance SE of the refrigerated / frozen warehouse S. Then, a horizontal adjustment plate 30 is laid on the bottom surface of the recess C formed in the floor surface FL. At this time, the horizontal adjustment plate 30 is adjusted so that its upper surface is parallel to the floor surface FL by adjustment means provided on the lower surface. The horizontal adjustment plate 30 is also fixed to the bottom surface of the recess C by the adjustment means.

[0056] As shown in Figure 7(b), a frame 20 is provided on the upper surface of a horizontal adjustment plate 30 laid on the bottom surface of recess C. In this case, the horizontal adjustment plate 30 and the frame 20 are not fixed together. The storage space 204 formed in recess C is evenly divided into six heating spaces 207 by the checkered steel plate support 205 that constitute the frame 20.

[0057] Next, as shown in Figure 7(c), the support steel plates 24 are placed on each support steel plate support portion 206a of the support steel plate support 206 that constitutes the frame 20, thereby dividing the heating space 207 into two spaces, upper and lower.

[0058] Then, as shown in Figure 8(a), foamed urethane (rigid urethane foam) is ejected from the holes 241 in the support steel plate 24 to form a second insulation material 25 between the support steel plate 24 and the bottom surface (the top surface of the cinder concrete K). The second insulation material 25 is formed in all heated spaces 207.

[0059] Next, as shown in Figure 8(b), a heat insulating material such as glass wool is laid on the upper surface of the support steel plate 24, and the first heat insulating material 23 is placed on top of the support steel plate 24. The first heat insulating material 23 is provided in all heated spaces 207.

[0060] Next, as shown in Figure 8(c), floor heaters 22 are placed on top of the first insulation material 23. Then, by connecting the wiring L of the floor heater 22 and the power supply wiring with a connector or the like, power can be supplied to the floor heater 22.

[0061] Next, as shown in Figure 8(d), the checkered steel plate 21 is placed on the upper part of the floor heater 22, on top of the wall 203 and checkered steel plate support 205 that constitute the frame 20. At this time, the checkered steel plate 21 is fixed to the wall 203 and checkered steel plate support 205 with fixing means 40 such as bolts, and is also fixed to the horizontal adjustment plate 30 through holes 210 provided in the corners of the checkered steel plate 21. As a result, the floor heater device 1 is housed and fixed in the recess C. The lower surface of the checkered steel plate 21 is in contact with the upper surface of the floor heater 22. However, since the load on the upper surface of the checkered steel plate 21 is distributed to the entire frame 20 via the wall 203 and checkered steel plate support 205, the load from the checkered steel plate 21 is not directly generated on the floor heater 22. In other words, by making the left and right widths of the heating space 207 smaller than the width of the tires of the trolleys and forklifts passing over the checkered steel plate 21, the risk of the checkered steel plate 21 bending is reduced as much as possible, the load from the trolleys and forklifts is not directly applied to the floor heater 22, and the possibility of the floor heater 22 failing is reduced as much as possible. Furthermore, since the floor heater 22 is supported by a first insulating material 23 that has an elastic effect and has an air layer inside, it is constantly in contact with the checkered steel plate 21 due to the elastic effect of the first insulating material 23. As a result, the heat generated by the floor heater 22 is transferred to the checkered steel plate 21 as much as possible, and a state of high heat transfer efficiency to the checkered steel plate 21 can be maintained.

[0062] As described above, the floor heater device 1 according to this embodiment is installed in the recess C by the procedure shown in Figures 7 and 8. Once the floor heater device 1 is installed in the recess C, the frame 20, checkered steel plate 21, floor heater 22, first insulation material 23, support steel plate 24, and second insulation material 25 (i.e., the floor heater section 2) can be removed as a single unit from the recess C by removing the fixing means 40 that fixes the checkered steel plate 21 and the horizontal adjustment plate 30.

[0063] In this case, the floor heater unit 2 can be replaced while the horizontal adjustment plate 30 is laid on the floor surface of the recess C. As a result, the floor heater unit 2 is manufactured by performing the work shown in Figures 7(b), (c) and 8(a) to (d) outside of the recess C, the floor heater unit 2 already installed in the recess C is removed, the replacement floor heater unit 2 formed outside the recess C is installed inside the recess C, and the fixing means 40 is inserted through the hole 210 provided in the corner of the checkered steel plate 21 and its tip is fixed to the horizontal adjustment plate 30, thereby completing the replacement work of the floor heater device 1.

[0064] After installing the floor heater device 1 in the recess C, the small gap formed between the wall 203 and the recess C can be filled by pouring quick-drying patching mortar between the outer surface of the wall 203 and the inner surface of the recess C. Patching mortar is strong against compressive stress but weak against tensile stress. Therefore, in the configuration in which the floor heater device 1 is installed in the recess C, only compressive stress is applied to the patching mortar from the forklift F, thus restricting the oscillation of the floor heater device 1 within the recess C. When replacing the floor heater unit 2, a tensile load is generated in the patching mortar as the floor heater unit 2 is lifted. As a result, when replacing the floor heater unit 2, the patching mortar is easily broken, and there is no risk of it hindering the replacement work of the floor heater unit 2.

[0065] Furthermore, because the floor heater unit 1 has a frame 20 and a floor heater section 2 including a checkered steel plate 21 integrally formed, the floor heater 22, first insulation material 23, support steel plate 24, and second insulation material 25, which are installed in the storage space 204 of the recess C, can be moved integrally with the frame 20 and checkered steel plate 21. In other words, the entire floor heater section 2 can be replaced, and even if the floor heater 22 malfunctions or the frame 20 becomes distorted, the floor heater unit 1 can be replaced with a properly functioning one simply by replacing the floor heater section 2.

[0066] The floor heater device 1 according to this embodiment can be easily fixed and released from the recess C by the fixing means 40. With this configuration, the floor heater device 1 can be fixed and released from the recess C by fixing and releasing the fixing means 40, so that when the floor heater 22 malfunctions, the floor heater unit 2 including the floor heater 22 can be easily replaced, and the replacement work is easier than the replacement work of the floor heater in conventional floor heater devices, so that repair work on the floor heater device 1 can be carried out quickly.

[0067] ≪Second Embodiment≫ The overall configuration of the floor heater device 1A according to the second embodiment of the present invention will be described with reference to Figures 9 to 12. Figure 9 is an exploded perspective view showing the configuration of the floor heater device 1A. Figure 10 is a diagram showing the configuration of the frame 20A. Figure 11 is a schematic cross-sectional view showing the floor heater device 1A installed in the recess C. Figure 12 is an enlarged view of the portion enclosed by the dashed line in Figure 11. Hereinafter, the floor heater device 1A according to the second embodiment will be described with reference to the drawings.

[0068] In the second embodiment, the floor heater device 1A differs from the first embodiment in the configuration of the frame 20A and the horizontal adjustment unit 3A. However, as shown in Figure 10, the only change from frame 20 to frame 20A is that the integral mounting hole 203f of frame 20 is changed to a fixing hole 203g, so a detailed explanation of frame 20A is omitted. The horizontal adjustment unit 3A will be described in detail below, and the same configuration as the floor heater device 1 in the first embodiment will not be described.

[0069] As shown in Figure 9, the horizontal adjustment unit 3A includes a horizontal adjustment plate 30A and a swing restrictor 30B placed on the horizontal adjustment plate 30A.

[0070] The horizontal adjustment plate 30A is formed in a roughly rectangular shape in plan view and is a flat plate with its thickness oriented vertically. The horizontal adjustment plate 30A is a metal plate, and its outer shape is larger than that of the frame 20A. In other words, in plan view, the outer edge of the horizontal adjustment plate 30A is larger than the outer edge of the frame 20A.

[0071] Furthermore, the horizontal adjustment plate 30A has multiple horizontal adjustment holes 301A. Level adjustment bolts are screwed into the horizontal adjustment holes 301A to make the upper surface of the horizontal adjustment plate 30A parallel to the floor surface FL. Therefore, by adjusting the length of the protrusion of the level adjustment bolts downward from the lower surface of the horizontal adjustment plate 30A, the upper surface of the horizontal adjustment plate 30A can be made approximately parallel to the floor surface FL without being affected by the uneven shape of the bottom surface of the recess C.

[0072] The oscillation restrictor 30B has a fixed portion 301B that is mounted and fixed on the horizontal adjustment plate 30A, and an oscillation restrictor 302B that is bent upward at a right angle from the inner end of the fixed portion 301B and rises vertically.

[0073] The fixing portion 301B is formed in a roughly rectangular, flat plate shape in plan view, and has a roughly rectangular opening 303B in the center. The fixing portion 301B has its thickness in the vertical direction, and its thickness is formed to be approximately the same as that of the horizontal adjustment plate 30A, and its outer shape is also approximately the same. The opening 303B is formed to be slightly larger than the outer shape of the frame 20A, and is sized to accommodate the frame 20A within the opening 303B. In addition, the swing restrictor 30B has a swing restrictor portion 302B erected along the opening 303B.

[0074] The oscillation restricting part 302B is formed in a roughly plate shape with approximately the same thickness as the fixed part 301B and is provided along the opening 303B. The oscillation restricting part 302B is formed in a flat plate shape and its height is set to approximately the same height as the frame 20A placed on the upper surface of the horizontal adjustment plate 30A. In other words, the upper end of the oscillation restricting part 302B is set to approximately the same height as the upper end of the side wall of the recess C. That is, when the horizontal adjustment part 3A is placed on the bottom surface of the recess C, the upper end of the oscillation restricting part 302B is set to a height that is approximately flush with the floor surface FL.

[0075] By configuring the horizontal adjustment unit 3A in this manner, the horizontal adjustment unit 3A is placed in the recess C, the upper surface of the horizontal adjustment plate 30A is adjusted with level adjustment bolts so that it is parallel to the floor surface FL, and patching mortar is poured between the oscillation restricting unit 302B and the side wall of the recess C, thereby forming an oscillation restricting space CS having a bottom surface parallel to the floor surface FL (see Figures 11 and 12). In other words, the oscillation restricting space CS is formed in the shape of a box enclosed by the horizontal adjustment plate 30A and the oscillation restricting unit 302B, with the top open. Then, by housing the floor heater unit 2A in this oscillation restricting space CS, the installation of the floor heater device 1 in the recess C is completed.

[0076] Furthermore, by installing the floor heater unit 2A and the horizontal adjustment unit 3A independently within the recess C, in the event of a malfunction of the floor heater device 1, the floor heater unit 2A can be removed from the oscillation restriction space CS, and a properly functioning floor heater unit 2A can be placed back into the oscillation restriction space CS to complete the replacement of the floor heater device 1, thereby quickly resolving the malfunction of the floor heater device 1.

[0077] Furthermore, by configuring the oscillation restrictor 30B in a roughly L-shape in a vertical cross-sectional view, and by pouring patching mortar between the outer surface of the oscillation restrictor 302B and the side wall of the recess C to fix the horizontal adjustment unit 3A within the recess C, the movement of the horizontal adjustment unit 3A can be restricted during the replacement of the floor heater unit 2A. In other words, the replacement of the floor heater unit 2A can be performed without moving the horizontal adjustment unit 3A.

[0078] ≪Construction Procedure≫ Referring to Figures 13(a) to (c), the procedure for installing the floor heater device 1A of the second embodiment into the recess C will be described. In the second embodiment, the floor heater unit 2A is manufactured in a factory or the like, so the explanation of the installation procedure for the floor heater unit 2A will be omitted.

[0079] As shown in Figure 13(a), the floor surface FL is chipped away, the floor heater embedded in the floor surface FL is removed, and a recess C for placing the floor heater device 1A is formed at the entrance SE of the refrigerated / frozen warehouse S. Then, the horizontal adjustment section 3A is laid on the bottom surface of the recess C formed in the floor surface FL. At this time, the horizontal adjustment plate 30A of the horizontal adjustment section 3A is adjusted so that its upper surface is horizontal by a level adjustment bolt screwed into the horizontal adjustment hole 301A.

[0080] As shown in Figure 13(b), quick-drying patching mortar is poured between the outer surface of the oscillation restricting portion 302B of the oscillation restricting body 30B, which is integrally formed with the horizontal adjustment plate 30A, and the side wall of the recess C. This fills the small gap formed between the oscillation restricting portion 302B and the recess C with patching mortar, and patching mortar is formed on the upper surface of the fixing portion 301B, fixing the horizontal adjustment portion 3A to the bottom surface of the recess C.

[0081] As shown in Figure 13(c), the floor heater section 2A, which is integrally formed in a factory or the like, is housed in the swing-restricting space CS formed by the horizontal adjustment section 3A fixed in the recess C, and comprises a frame 20, a checkered steel plate 21, a floor heater 22, a first heat insulating material 23, a support steel plate 24, and a second heat insulating material 25.

[0082] As described above, the floor heater device 1A according to the second embodiment is installed in the recess C by the procedure shown in Figures 13(a) to (c). Since the floor heater device 1A consists of a floor heater section 2A and a horizontal adjustment section 3A which are configured independently, the floor heater section 2A can be easily removed from the recess C.

[0083] Furthermore, because the floor heater unit 1 has a frame 20 and a floor heater section 2 including a checkered steel plate 21 integrally formed, the floor heater 22, first insulation material 23, support steel plate 24, and second insulation material 25, which are installed in the storage space CS of the recess C, can be moved integrally with the frame 20 and checkered steel plate 21. In other words, the entire floor heater section 2 can be replaced, and even if the floor heater 22 malfunctions or the frame 20 becomes distorted, the floor heater unit 1A can be replaced with a properly functioning one simply by replacing the floor heater section 2.

[0084] The floor heater device 1A according to the second embodiment allows for easy installation and removal of the floor heater unit 2A from the recess C, as described above. In this way, the floor heater device 1A has a configuration in which the floor heater unit 2A and the horizontal adjustment unit 3A are independent, and the horizontal adjustment unit 3A cannot be easily removed from the recess C while maintaining a horizontal position within the recess C, thus enabling easy installation and removal of the floor heater unit 2A. Therefore, it is easier than replacing the floor heater in a floor heater device, and repair work on the floor heater device 1A can be carried out quickly.

[0085] Although one embodiment of the present invention has been described, the above description is merely an example of the present invention, and the present invention is not limited to the above-described embodiment. Therefore, it goes without saying that various modifications are possible depending on the design, etc., even in embodiments other than those described above, as long as they do not depart from the technical idea of ​​the present invention. [Explanation of Symbols]

[0086] 1.1A Floor Heater Device 2.2A Floor heater section 3,3A horizontal adjustment section 20,20A frame 21 Checkered steel plate 22 Floor heaters 23. First insulation material 24 Support steel plate 25. Second insulation material 30,30A horizontal adjustment plate 30B Swinging Regulator 31 Fixing hole 32 Adjustment hole 40 Fixing means 201 Frame 202 Support part 203 Wall 204 Storage space 205 Checkered steel plate support 206 Support steel plate support 207 Heating space 210 Hole 241 Hole 301A Horizontal adjustment hole 301B Fixed part 302B Swinging Restriction Unit 303B opening C recess CS Oscillation Regulated Space F Forklift FL floor surface K Cinder Concrete L wiring P Connection Space C1 Bottom FL floor surface S cold storage SE entrance

Claims

1. A floor heater device installed on the floor surface of the entrance / exit of a refrigerated or frozen warehouse where goods are stored under low temperature conditions, Floor heater unit detachably housed in the recess of the floor surface The aforementioned floor heater section is, A frame body housed in the aforementioned recess, A checkered steel plate is detachably placed on the frame and closes the upper surface of the recess, A floor heater is provided below the aforementioned checkered steel plate, The first insulating material is provided below the floor heater, A support steel plate provided below the first insulation material, A second insulating material is provided below the aforementioned support steel plate, Equipped with, The floor heater section is housed in the frame, forming multiple layers from top to bottom in the order of the floor heater, the first insulating material, the support steel plate, and the second insulating material. A floor heater device characterized in that the frame is integrally formed with the checkered steel plate and fixing means in a manner that houses the floor heater, the first insulating material, the support steel plate, and the second insulating material.

2. A floor heater device according to claim 1, In the configuration where the floor heater is housed in the recess, the floor heater further has a horizontal adjustment section that supports the floor heater section in a substantially horizontal position. The aforementioned frame body is A frame portion provided along the side wall forming the recess, A storage space enclosed by the aforementioned frame is provided with a support structure mounted on the opposing surfaces of the frame, It has, The aforementioned horizontal adjustment unit is A horizontal adjustment plate is provided, which is placed on the bottom surface of the recess and is used to make the frame horizontal. A floor heater device characterized in that the bottom surfaces of the frame and the support are supported by the horizontal adjustment plate.

3. The floor heater device according to claim 2, characterized in that the checkered steel plate and the frame are fixed to the horizontal adjustment plate by the fixing means.

4. A floor heater device according to claim 1, In the configuration where the floor heater is housed in the recess, the floor heater further has a horizontal adjustment section that supports the floor heater section in a substantially horizontal position. The aforementioned horizontal adjustment unit is A horizontal adjustment plate for making the frame horizontal is provided on the bottom surface of the recess, It has a swing restricting body that is placed on the horizontal adjustment plate and interposed between the frame and the side wall of the recess, A floor heater device characterized in that the horizontal adjustment plate and the oscillation restrictor are integrally formed.

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