JP2004069098A - Frost heaving prevention method of under floor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely perform frost heaving prevention, reduce a construction cost and a running cost, and easily perform maintenance. <P>SOLUTION: An under floor blast piping 25 constituted by a perforated pipe is arranged inside an under floor crushed rock layer 19. A hot air by an exhaust heat of a refrigerator outside machine 16 and an outside air which is taken into a space between an outer wall 29, a roof 28 of a building 11 and a wall of a freezing chamber 12 and is made to flow in the space are sent to the blast piping in a switchable manner. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for preventing underfloor frost heave by utilizing waste heat in a freezer.
[0002]
[Prior art]
When constructing a freezer and refrigerator inside the existing building as a distribution center for handling frozen foods and ice cream, it is necessary to prevent freezing of the soil under the soil of the freezer used below zero (hereinafter referred to as frost heave prevention). Become.
[0003]
Conventionally, as a structure for preventing frost heaving under the floor of a refrigerator, in addition to adopting a method of preventing cold heat from being transmitted to the soil or the ground by heat insulating material, a ventilation pipe is piped in a reinforced concrete slab. Cold heat escaping to the ground (underground) is released into the air from the inside of the refrigerated warehouse through ventilation pipes.
[0004]
According to Japanese Patent Application Laid-Open No. 10-121636, as shown in FIGS. 4 and 5, a ventilation pipe in a floor structure of a conventional refrigerator-freezer is mounted on a ground where a metal deck plate 4 is leveled flat. The space formed between the ground and the ground 1 is replaced by using as a ventilation hole 6, and the metal deck plate 4 serves as a lower reinforcing bar in reinforced concrete, and pipes for ventilation pipes and The floor structure of a refrigerated warehouse in which the reinforcement of the lower rebar can be omitted is shown. Reinforcing bars 8 are arranged on the metal deck plate 4, and after the reinforcing bars are laid, concrete is cast and a reinforced concrete layer 7 is formed on the metal deck plate 4.
[0005]
A ventilation pipe 10 is connected from the end of the ventilation hole 6 formed between the metal deck plate 4 and the ground 1 to stand up. On the reinforced concrete layer 7, a heat insulating material 9 is laid. 5 shows an underground beam in the figure.
[0006]
In this manner, the ventilation in the ventilation hole 6 is enabled, and the cold heat escaping to the ground (underground) is released into the air from the freezing and refrigerated warehouse. The ventilation may be performed more actively by connecting a forced air blowing device (not shown) such as a blower to the ventilation pipe.
[0007]
[Problems to be solved by the invention]
However, as described above, the frost heave prevention effect that is expected cannot be obtained simply by blocking the transmission of cool air with the heat insulating material or by merely ventilating the inside of the ventilation hole 6. In addition, conventional maintenance in the case of freezing has been time-consuming and time-consuming because hot water or hot air is sent to the underfloor piping and thawed.
[0008]
SUMMARY OF THE INVENTION An object of the present invention is to provide a method for preventing frost heaving under the floor, which can solve the inconvenience of the conventional example, can surely prevent frost heaving, can reduce the construction cost and running cost, and can easily perform maintenance.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention firstly arranges an underfloor ventilation pipe with a perforated pipe in the underfloor crushed stone layer, and supplies hot air due to exhaust heat of a freezing outdoor unit and outside air to this ventilation pipe. Introducing the air flowing into the space between the outer wall / roof of the building and the wall of the freezer or the like in a switchable manner. Second, a fan is provided in an air supply pipe to the underfloor air supply pipe, and an upstream side of the fan is provided. Third, the underfloor layer, which is provided with a perforated pipe under the floor, is installed above the existing soil, an insulation layer is formed thereon, and furthermore, the concrete between the floors is cast. The gist is to do.
[0010]
According to the first aspect of the present invention, for example, in the winter, warm air generated by the exhaust heat of the freezing outdoor unit is sent to the underfloor air pipe arranged in the underfloor crushed stone layer, and the hot air flows out of the hole of the underfloor air pipe. Then, it flows into the gaps between the crushed stones in the underfloor crushed stone layer and warms the whole underfloor crushed stone layer widely. As a result, frost heave prevention can be reliably performed. Also, for example, in the summer, warming is performed by taking in outside air into the space between the outer wall of the building and the wall of the freezer, and the heated air is sent to the underfloor ventilation pipe. . In addition, by taking outside air into the space between the outer wall of the building and the wall of the freezer as described above, ventilation and dew condensation can be prevented.
[0011]
According to the second aspect of the present invention, in addition to the above-described operation, a summer / winter switching damper is provided, and it is possible to blow air depending on the condition of the outside air temperature and humidity. In addition, maintenance can be easily performed by freezing hot air with a heater or the like to the suction side of the fan.
[0012]
According to the third aspect of the present invention, when constructing a freezer / refrigerator inside using an existing frame, it is possible to omit the work of dismantling the existing soil and improving the ground, thereby reducing costs.
[0013]
BEST MODE FOR CARRYING OUT 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 a method for preventing underfloor frost heave according to the present invention, FIG. 2 is a sectional view showing details of a floor portion, and FIG. 3 is a piping diagram. This is a case where a freezer / refrigerator is built inside using an existing skeleton as a distribution center that handles products.
[0014]
In the figure, reference numeral 11 denotes a steel frame building, the floor of the first floor is divided into four sections, a freezer 12 at -25 ° C, a refrigerator 13a at -10 ° C, a picking refrigerator 13b at + 5 ° C, and a platform refrigerator 13c at + 5 ° C. And an office 14 and a warehouse 15 are formed.
[0015]
The refrigeration equipment is composed of a refrigeration outdoor unit 16 as an air-cooling integrated refrigerator installed outdoors and a floor-mounted or ceiling-exposed unit cooler (not shown) installed indoors.
[0016]
Without dismantling the existing slab 17 on the soil 18 and improving the ground, the present invention provides the underfloor crushed stone layer 19 under the existing slab 17 with the underfloor crushed stone layer 19 and disposing concrete 20 thereon. Then, a heat insulating layer 21 made of styrofoam or the like was provided thereon, and furthermore, a slab concrete 22 was cast thereon, and a flooring concrete 23 was laid on the slab 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 a material of the underfloor ventilation pipe 25, a perforated VP pipe is employed to efficiently blow air around the underfloor crushed stone layer 19.
[0018]
In addition, in order to reduce the power running cost and simplify the workability, the 23 underfloor ventilation pipes 25 are combined into three systems, and three fans 26 are provided in the airpipe 27 to the underfloor ventilation pipe 25. I 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 13a to 13c, and air is supplied to the lower part of the building 11 so as to communicate with the air flow space 30. An outlet 31 and an exhaust port 32 are formed, and the air supply port 31 is opened to the outside as intake of outside air. The exhaust port 32 connects an air supply pipe 27 and connects the air supply pipe 27 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 collection hood above the compressor of the freezer outdoor unit 16 so that the exhaust heat of the freezer outdoor unit 16 is blown by the fan 26.
[0021]
A switching damper 33 is provided upstream of the fan 26.
[0022]
Further, a temperature sensor 34 was buried and installed on the portion of the soil 18 below the existing soil 17 and on the upper portion of the crushed stone layer 19 under the floor for the purpose of predicting the danger of freezing. The temperature of the temperature sensor 34 is displayed on a temperature display panel (control panel) 35 installed on the inner wall surface of the office 14 so that it can be monitored on a daily basis.
[0023]
In this way, the exhaust heat of the freezing outdoor unit 16 is blown by the fan 26 in the winter to supply air to the underfloor ventilation pipe 25.
[0024]
In the summer, outside air taken in from the air supply port 31 flows into the air flow space 30 between the outer wall 29 and the roof 28 of the building 11, the freezer 12, and the walls of the refrigerators 13a, 13b, and 13c. Air to be warmed 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 the switching damper 33 is only for switching between the winter and summer seasons. Instead, it can be performed as appropriate depending on the conditions of the outside air temperature and humidity.
[0026]
In this way, if the exhaust heat temperature of the freezing outdoor unit 16 is 30 ° C. and the ambient outside air temperature is 6 ° C., the underfloor and the underfloor measured by the temperature sensor 34 above the existing soil 17 and the underfloor crushed stone layer 19 are used. 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 frost heave prevention method of the present invention distributes hot air generated by exhaust heat of a freezing outdoor unit and warmed outside air between an outer wall of a building and a wall of a freezer in the crushed stone layer under the floor so that it can be appropriately switched. By sending this hot air to the gap between the crushed stones in the crushed stone layer under the floor, it is possible to reliably prevent frost heave, and also to prevent ventilation and dew 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 one embodiment of a method of preventing underfloor frost heave of the present invention.
FIG. 2 is a cross-sectional view showing details of a floor portion in one embodiment of the underfloor frost heave prevention method of the present invention.
FIG. 3 is a piping diagram showing an embodiment of a method for preventing underfloor frost heave according to the present invention.
FIG. 4 is an overall vertical sectional side view showing a conventional example.
FIG. 5 is a vertical 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 ... Heat insulation material 10 ... Ventilation pipe 11 ... Building 12 ... Freezer 13a, 13b, 13c ... Refrigerator 14 ... Office 15 ... warehouse 16 ... freezer outdoor unit 17 ... existing soil 18 ... soil 19 ... underfloor crushed stone layer 20 ... discarded concrete 21 ... heat insulation layer 22 ... soil concrete 23 ... flooring increase concrete 24 ... waterproof sheet 25 ... underfloor ventilation pipe 26 ... Fans 27, 27a ... Air supply 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 (3)

Under-floor ventilation pipes with perforated pipes are installed in the underfloor crushed stone layer. A method for preventing underfloor frost heaving, characterized in that the air flowing into an intervening space is switchably sent. The underfloor frost heave prevention method according to claim 1, wherein a fan is provided in an air supply pipe to the underfloor ventilation pipe, and a switching damper is provided upstream of the fan. The underfloor frost heave according to claim 1 or 2, wherein the underfloor layer for providing the underfloor ventilation pipe with a perforated pipe is provided above the existing soil, a heat insulating layer is formed thereon, and furthermore, the soil concrete is cast thereon. Prevention method.

Images