JP3961364B2 - Underfloor freezing prevention method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for preventing underfloor freezing by using exhaust heat in a freezer.
[0002]
[Prior art]
As a distribution center for handling frozen foods and ice cream, when building a freezer / refrigerator inside an existing enclosure, it is necessary to prevent freezing of the soil below the soil of the freezer used under zero (hereinafter referred to as prevention of freezing) Become.
[0003]
Conventionally, as a structure to prevent frost heave under the floor of a refrigerator, in addition to adopting a method to prevent cold heat from being transmitted to the soil or the ground by a heat insulating material, a ventilation pipe is installed in the reinforced concrete slab. The cold heat that escapes to the ground (underground) is released into the air from the inside of the refrigerated warehouse through the ventilation pipe.
[0004]
According to Japanese Patent Laid-Open No. 10-121636, as shown in FIGS. 4 and 5, the ventilation pipe in the floor structure of the conventional freezer / refrigeration warehouse is placed on the ground leveled with the metal deck plate 4 flat. The space formed between the ground 1 and the ground 1 is replaced by using it as a vent hole 6, and the metal deck plate 4 is used as a lower reinforcing bar in reinforced concrete. The floor structure of a freezer / refrigerated warehouse is shown in which lower bar reinforcement can be omitted. Reinforcing bars 8 are placed on the metal deck plate 4, and after placement, concrete is placed, and a reinforced concrete layer 7 is formed on the metal deck plate 4.
[0005]
A vent pipe 10 is connected from the end of the vent hole 6 formed between the metal deck plate 4 and the ground 1 and started up. A heat insulating material 9 is laid on the reinforced concrete layer 7. In the figure, 5 indicates an underground beam.
[0006]
In this way, ventilation in the vent hole 6 is made possible, and cold heat escaping to the ground (underground) is released into the air from the inside of the refrigerated warehouse. For ventilation, for example, a forced air blower (not shown) such as a blower may be connected to the vent pipe to ventilate the outside air more actively.
[0007]
[Problems to be solved by the invention]
However, as described above, the expected anti-freezing effect cannot be obtained only by blocking the transmission of cold air with the heat insulating material or by ventilating the air holes 6. In addition, the conventional maintenance in the case of freezing has been time consuming and troublesome because hot water or hot air is sent to the underfloor piping and thawed.
[0008]
An object of the present invention is to provide a method for preventing under-floor frost heave, which can eliminate the disadvantages of the conventional example, can surely prevent frost heave, has low construction cost and running cost, and is easy to maintain.
[0009]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention provides an underfloor ventilation pipe by a perforated pipe in the underfloor crushed stone layer, disposing concrete on the underfloor crushed stone layer, and providing a heat insulating layer thereon, On top of it, concrete is placed between them, a fan is provided in the air supply pipe to the underfloor ventilation pipe, a switching damper is provided on the upstream side of the fan, and air flows between the outer wall of the building, the roof, and the freezer wall. An air supply port and an exhaust port are formed in the lower part of the building so as to communicate with this air flow space, and the air supply port opens to the outside as an outside air intake, and the exhaust port is a fan of the air pipe. Further, the air supply pipe is connected to a duct connected to a heat collecting hood above the compressor of the freezer outdoor unit, and this air supply pipe is connected to a duct connected to a heat collecting hood above the compressor of the freezer outdoor unit. In addition, take the warm air from the exhaust heat of the freezer and the outside air The gist of the invention is that the air flowing into the space between the outer wall / roof of the building and the wall such as the freezer is sent in a switchable manner.
[0010]
According to the first aspect of the present invention, for example, in the winter, warm air generated by exhaust heat from the freezer outdoor unit is sent to the underfloor ventilation pipe disposed in the crushed stone layer under the floor, and this hot air flows out from the hole in the underfloor ventilation pipe. Then, it flows into the gap between the crushed stones in the underfloor crushed stone layer, and warms the entire underfloor crushed stone layer widely. As a result, frost heave prevention can be reliably performed. In addition, for example, in summer, the outside air can be warmed by taking it into the space between the outer wall of the building and the wall of the freezer, and this warmed air can be sent to the under-floor ventilation pipe to prevent frost heaving reliably. . In addition, ventilation and dew condensation prevention can be performed by taking outside air into the space between the outer wall of the building and the wall of the freezer as described above.
[0011]
In addition, a summer / winter switching damper can be provided to blow air depending on the outside air temperature and humidity. As for maintenance when frozen, maintenance can be easily performed by sending warm air heated by a heater or the like to the suction side of the fan.
[0012]
Moreover, when constructing a freezer / refrigerator inside using an existing frame, it is possible to reduce costs by dismantling the existing soil and improving the ground.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an explanatory view showing an embodiment of the method for preventing underfloor freezing according to the present invention, FIG. 2 is a cross-sectional view showing details of the floor portion, and FIG. 3 is a piping diagram. This is a case where a freezer / refrigerator is built inside using an existing box as a distribution center for handling the food.
[0014]
In the figure, 11 is a steel-framed building, and the first floor is divided into 4 sections, a -25 ° C freezer 12, a -10 ° C refrigerator 13a, a + 5 ° C picking refrigerator 13b, and a + 5 ° C platform refrigerator 13c. In addition, an office 14 and a warehouse 15 are formed.
[0015]
The refrigeration equipment includes a freezer outdoor unit 16 as an air-cooled integrated refrigerator installed outdoors and a floor-mounted or ceiling-exposed unit cooler (not shown) installed indoors.
[0016]
Without dismantling the existing soil 17 above the soil 18 and performing ground improvement, the present invention provides the under-floor crushed stone layer 19 with the under-floor crushed stone layer 19 above the existing soil 17 and disposed of the discarded concrete 20 thereon. Then, a heat insulating layer 21 made of styrofoam or the like was provided thereon, and earth concrete 22 was placed thereon, and a floor-increase concrete 23 was placed on the earth concrete 22. In the figure, reference numeral 24 denotes a waterproof sheet interposed above and below the heat insulating layer 21.
[0017]
In order to form such a floor structure, a total of 23 underfloor ventilation pipes 25 are installed in the underfloor crushed stone layer 19 at an appropriate pitch. As the material of the underfloor ventilation pipe 25, a perforated VP pipe is adopted in order to efficiently blow air around the underfloor crushed stone layer 19.
[0018]
Also, in order to reduce the power running cost and simplify the workability, 23 underfloor ventilation pipes 25 are grouped into 3 systems, and 3 fans 26 are provided with fans in the air supply pipe 27 to the underfloor ventilation pipe 25. To do.
[0019]
An air flow space 30 is secured between the outer wall 29 of the building 11, the roof 28, the freezer 12, and the walls of the refrigerators 13 a to 13 c, and air is supplied to the air flow space 30 at the lower part of the building 11. An outlet 31 and an exhaust port 32 are formed. The air supply port 31 opens to the outside as intake of outside air. The exhaust port 32 is connected to an air supply pipe 27 and is connected to the upstream side of the fan 26 of the air supply pipe 27.
[0020]
The air supply pipe 27 is connected to a duct connected to a heat collecting hood above the compressor of the freezing outdoor unit 16 as the exhaust heat of the freezing outdoor unit 16 is blown by the fan 26.
[0021]
A switching damper 33 is provided on the upstream side of the fan 26.
[0022]
Furthermore, a temperature sensor 34 was embedded in the soil 18 part under the existing soil 17 and the upper part of the crushed crushed stone layer 19 in order to predict frost heaving danger. The temperature of the temperature sensor 34 is displayed on a temperature display panel (control panel) 35 installed on the inner wall of the office 14 so that it can be monitored on a daily basis.
[0023]
In this way, the exhaust air from the freezer outdoor unit 16 is blown by the fan 26 in the winter for supplying air to the underfloor air supply pipe 25.
[0024]
In the summer, outside air taken from the air inlet 31 flows into the air flow space 30 between the outer wall 29 of the building 11, the roof 28, the freezer 12, and the walls of the refrigerators 13a, 13b, 13c. The air heated in the space between the freezer 12 and the wall panels of the refrigerators 13a, 13b, 13c is taken out from the exhaust port 32 and supplied to the underfloor ventilation pipe 25.
[0025]
The summer / winter switching damper 33 switches between winter and summer by supplying air to the underfloor ventilation pipe 25, and switching with such a switching damper 33 is only for switching between the winter and summer seasons. It is also possible to carry out the process appropriately depending on the outside air temperature and humidity conditions.
[0026]
In this way, if the exhaust heat temperature of the freezer outdoor unit 16 is 30 ° C. and the ambient outside air temperature is 6 ° C., the temperature of the floor 18 measured by the temperature sensor 34 above the soil 18 portion under the existing soil 17 and the top of the crushed stone layer 19 below the floor As for the outside air temperature, the underfloor temperature 1 is 16 ° C to 20 ° C, the underfloor temperature 2 is 18 ° C to 21 ° C, and the outside air temperature is -3 ° C to 10 ° C.
[0027]
【The invention's effect】
As described above, the underfloor freezing prevention method according to the present invention is arranged in the crushed stone layer under the floor so that the warm air generated by the exhaust heat of the freezer outdoor unit and the outside air heated between the outer wall of the building and the freezer wall can be appropriately switched. By sending this warm air through the gap between the crushed stones in the underfloor crushed stone layer, it is possible to reliably prevent frost heaving, and to prevent ventilation and condensation at the same time, Construction costs and running costs are low, and maintenance is easy.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing an embodiment of the underfloor frost heave prevention method of the present invention.
FIG. 2 is a cross-sectional view showing details of a floor portion in an embodiment of the underfloor frost heave prevention method of the present invention.
FIG. 3 is a piping diagram showing one embodiment of the underfloor freezing prevention method of the present invention.
FIG. 4 is an overall vertical side view showing a conventional example.
FIG. 5 is a longitudinal sectional front view of a main part showing a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Ground 4 ... Metal deck plate 6 ... Vent hole 5 ... Underground beam 7 ... Reinforced concrete layer 8 ... Reinforcement 9 ... Thermal insulation
10 ... Vent pipe 11 ... Building
12 ... Freezer 13a, 13b, 13c ... Refrigerator
14… Office 15… Warehouse
16 ... Freezer outdoor unit 17 ... Existing soil
18 ... Soil 19 ... Underground crushed stone layer
20 ... Waste concrete 21 ... Heat insulation layer
22 ... concrete concrete 23 ... flooring concrete
24 ... Waterproof sheet 25 ... Underfloor ventilation piping
26 ... Fan 27, 27a ... Air pipe
28 ... Roof 29 ... Outer wall
30 ... Air flow space 31 ... Air supply port
32 ... Exhaust port 33 ... Switching damper
34 ... Temperature sensor 35 ... Temperature display panel

Claims (1)

An underfloor ventilation pipe with a perforated pipe is installed in the crushed stone layer under the floor, abandoned concrete is disposed on the crushed stone layer under the floor, a heat insulating layer is provided thereon, and soil concrete is placed thereon. A fan is provided in the air supply pipe to the underfloor ventilation pipe, a switching damper is provided upstream of the fan, and an air flow space is secured between the outer wall of the building, the roof, and the freezer wall. The air supply port and the exhaust port are formed so as to communicate with this air flow space, the air supply port is opened to the outside as the outside air intake, the exhaust port is connected to the upstream side of the fan of the air supply pipe, The air pipe is connected to a duct connected to the heat collecting hood above the compressor of the freezer outdoor unit, and the exhaust heat from the freezer outdoor unit is blown by a fan. Wind and outside air are taken into the building's outer walls, roofs, freezers, etc. A method of preventing underfloor frost heft, characterized in that air flowing into the space between the walls of the floor is switchably sent.

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