KR102568264B1 - Insulating drainage board and construction method of cold storage warehouse using the same - Google Patents

Abstract

The present invention relates to an insulated drain plate and a method for constructing a floor in a refrigerated and low-temperature warehouse using the same. 30), the padistal 20 is inserted through the hole 13 formed in the insulation drain plate 10 so as to be supported on the bottom of the foundation, and the tee-nut 22 is rotated at the top of the steel padistal to Adjust the upper level, and form the heat insulating layer 40 to maintain a uniform spraying thickness according to the level of the T-nut 22 of the padistal 20, and place the pad 23 of elastic rubber on the T-nut 22 By bonding and forming by pouring and forming the rootless concrete layer 50 on the heat insulating layer 40, the heat insulating drainage plate of the extruded Styrofoam blocks the inflow of condensation water and absorbs moisture into the heat insulating layer of the polyurethane spraying There is no deterioration in insulation performance in the long term, and the padistal installed on the foundation floor penetrates the insulation drain plate to support the tensile and bending stress occurring in the finishing slab, preventing cracks and floor loss problems in the plain concrete layer. Thick polyurethane foam of 100 to 250 mm prevents difficulties in quality control such as polyurethane shrinkage cracks that occur during freezer operation, fire and toxic gas generation due to sparks during welding work, and reduces the thickness of spraying on site or factory processing By simplifying the process with simple assembly of flat products, it is possible to expect effects such as improved workability, uniform quality control, and construction cost reduction.

Description

Insulation drain board and method of constructing the floor of a refrigerated and low-temperature warehouse using the same

The present invention relates to an insulated drainage plate and a method for constructing a floor of a refrigerated and low-temperature warehouse using the same, and more particularly, to a heat insulation in which grooves for water passage and ventilation are formed on the bottom surface of the lowest concrete floor so that condensation water generated on the floor of the low-temperature warehouse can be treated and ventilated. In order to arrange a drainage plate, improve the tensile resistance of the finishing slab (unreinforced concrete) and absorb vibrations generated during the movement of a lift truck, a padistal made of steel is placed upright on the insulation drainage plate, and foamed polyurethane is sprayed on the top of the insulation drainage plate. It relates to an insulated drainage plate that supplements the airtightness of the floor seam by adding and then forms a finishing slab (unreinforced concrete) and a method of constructing the floor of a frozen low-temperature warehouse using the same.

Until now, when selecting an insulator applied to the floor of a freezer and low-temperature warehouse where the freezing and thawing process is repeated and always exposed to environments such as condensation and water leakage, it is simply an insulator without considering the degradation of insulation performance during the entire lifespan of the insulator due to time and environment. has been reflected in the design based on the initial thermal conductivity of

In the case of a freezer and low-temperature warehouse, the freezer was placed mainly on the lowest basement floor to minimize the influence of outside air, and the insulation construction was mainly applied to the wall, ceiling, and floor with two-component polyurethane on-site spraying. Unlike a wall, in the case of a floor, polyurethane spraying is applied to the top of the foundation to block the geothermal heat rising from the bottom of the foundation, and then a finishing slab (unreinforced concrete) is additionally formed on top to receive the loading load. there is.

The thickness of polyurethane spraying, which is foamed in the field, is usually 100 ~ 250mm depending on the freezing temperature. The characteristics of the insulation material are low in initial thermal conductivity (0.02) and increase in volume after foaming, so it tightly fills gaps such as joints between walls and floors to ensure airtightness. On the other hand, there is an advantage in terms of the cell structure, due to the unstable close cell, the absorption rate is high, and the long-term thermal conductivity rises rapidly (0.043) when moisture is absorbed. has

As the floor insulation located on the lowest floor, such as a cold storage warehouse, comes into contact with a constant temperature environment (15°~16°) in the ground, it is an insulation layer that comes into contact with the bottom floor due to a large temperature difference from the inside temperature of the cold storage warehouse (-15°~55°). Condensation water is generated in the lower part. In case of using a porous insulation material with high absorption rate, such as polyurethane spray coating, it absorbs condensation water, and in an accelerated environment where freezing and thawing processes are repeated, such as in a freezer and low-temperature warehouse, it absorbs condensation water and increases thermal conductivity. This rapidly increased (0.02 -> 0.043), resulting in a rapid decrease in insulation performance.

Moreover, as the cold air penetrating through the cracks of the finishing slab freezes the insulating material that has absorbed moisture, the volume of the insulating material increases, resulting in heaving of the floor finishing slab.

In addition, polyurethane spray coating has a problem in that the compressive strength is low to support the pallet load in the warehouse of 4 to 5 stages, which causes cracks in the finishing slab (unreinforced concrete) placed on the top and collapse of the floor.

The most frequently occurring defects in cold storage are floor cracks and broken floors.

In order to prevent cracks on the floor of a refrigerated warehouse, the design and construction of the floor itself is important, but the quality and construction condition of the insulation material constructed below have a very important influence.

In particular, the most important selection criterion for floor insulation materials used in freezers and low-temperature warehouses, where condensation water and infiltration water occur on the bottom floor and are exposed to continuous freezing and thawing environments and must support heavy upper loads, are the absorption rate of the insulation material, not the initial thermal conductivity. is the compressive strength.

Unlike walls and ceilings, the floor insulator located on the lowest layer is exposed to a constant temperature environment in the ground at all times, unlike walls and ceilings, so condensation water is generated at the bottom of the insulation layer due to the temperature difference inside the cold storage warehouse. This is because when the air inside the cell is replaced with moisture and the moisture freezes, the thermal conductivity rises rapidly and the insulation effect is rapidly reduced in the long term.

Moreover, freezing the insulation material increases the volume of the insulation material, causing heaving of the floor plain concrete.

Next to the water absorption rate of the insulation is the compressive strength of the insulation.

In other words, since the insulation material supports the loading load generated on the finishing slab (unreinforced concrete), a correspondingly sufficient compressive strength is required.

Moreover, in the finishing slab (unreinforced concrete) of the freezer and low-temperature warehouse, the tensile force caused by the load and the bending stress (curling) caused by the difference in shrinkage due to the large temperature difference between the inside and the surface act simultaneously, so that the insulation layer that must support the finishing slab Extrusion strength is becoming more important.

In addition, the finishing level is the most important quality control factor for insulation materials in construction,

Since the finishing slab (unreinforced concrete) of the freezer and low-temperature warehouse is constructed directly on top of the insulation, if the floor level is poor, it is not possible to secure a uniform design thickness of the upper finishing slab, which impairs structural safety, and also prevents drying shrinkage of the finishing slab. As a result, the occurrence of cracks on the floor increases.

For this reason, it is often the case that the finished level is adjusted by additionally constructing abandoned concrete or mortar after the insulation is installed.

However, since there are currently no specifications or standards for the finish level and compressive strength of the insulation in the design of the cold storage, many freezers are suffering damage.

In this way, in order to solve the problem caused by condensation water generated on the bottom surface of the low-temperature warehouse floor insulation, Korean Patent Registration No. 10-1344030 (registered on December 16, 2013) is schematically shown in FIG. Likewise, after installing the PVC drainage plate (2) on the upper part of the foundation (1), pouring plain concrete on the upper part of the PVC drainage plate (2), and forming a heat insulation layer (4) by spraying polyurethane on top of it, A double slab concept has been proposed to form a root-free concrete layer 5 thereon.

These PVC drain boards have a height of 100 to 250 mm to increase ventilation and water-passing functions compared to 45 mm generally used in buildings. The smoothness of the surface is important, and if the floor smoothness is poor, the force is biased only on the column closing the upper surface of the foundation, causing shear cracks in the upper finishing slab (unreinforced concrete).

In addition, in the process of mixing the two-component polyurethane raw material, a reaction heat of 120° is generated. There is a problem in that the heat layer (unreinforced concrete) must be placed between the drainage plate and the polyurethane spraying.

With the addition of a thick PVC drainage plate and a heat shield layer (unreinforced concrete) as above, an additional excavation depth of 200 to 350 mm is required. A vortex (vortex) is formed around the air flow, which causes a problem in which it is difficult to expect the original ventilation function.

In addition, in Registered Patent No. 10-1395281 (May 8, 2014) of the inventor of the present invention, there is an insulated drainage plate having a structure in which concrete is filled in the column part when pouring upper unreinforced concrete through a perforated part in the drainage plate to support the upper load. However, this insulated drainboard is applied to the floor of the freezer warehouse due to the problem that cold bridges occur due to the cryogenic temperature of -25 to -55° through the pillars filled with unreinforced concrete when applied to the floor of the freezer warehouse. Improvement of the drainage plate pillar part was required.

Registered Patent No. 10-1344030 (December 16, 2013) Registered Patent No. 10-1395281 (May 8, 2014)

An object of the present invention is to solve the above problems of the prior art, there is no absorption rate on the upper part of the foundation of the refrigeration and low-temperature warehouse to prevent floor cracking and burnout, so that there is no long-term thermal conductivity change. is formed and a padistal is inserted inside to improve resistance to tensile and bending stress occurring in unreinforced concrete, absorb vibrations generated during the operation of a tow truck, and through a level adjustment function, a uniform thickness of insulation layer and finishing slab (unreinforced) It is to provide a method of constructing a floor of a refrigerated low-temperature warehouse using an insulated drainage plate that can be used in concrete).

In order to achieve the above object, according to the present invention, the insulation drainboard for floor construction of a refrigerated warehouse is made of extruded styrofoam in a rectangular shape with little change in initial thermal conductivity and long-term thermal conductivity in repeated freeze-thaw environments with extremely low water absorption. Furnace, straight-line grooves for water and ventilation are formed in a lattice shape on the bottom surface in contact with the upper surface of the foundation of the refrigerated and low-temperature warehouse, and inserted into the hole through the insulation drain plate by interference fit to stand alone on the upper surface of the warehouse foundation It is configured to further include a padistal (support column) that improves resistance to tensile and bending stress generated in the finishing slab (unreinforced concrete) by being arranged and supported.

The padistal includes a post with a length protruding as high as the height of the heat insulation layer formed on the insulation drain plate and a T-nut with an expanded radius to prevent punching cracks occurring at the contact point with the plain concrete formed on the top thereof,

On the tee-nut, an elastic rubber pad having low thermal conductivity is provided for the purpose of absorbing floor vibration generated when the forklift truck moves and blocking heat transfer from the plain concrete to the post.

The tee-nut has a nut and a washer with an extended radius integrally formed, and is coupled to the support to form a heat insulating layer so that the height of the washer can be adjusted by rotating the tee-nut according to the height, resulting in poor smoothness of the upper surface of the foundation By correcting the level difference, it is possible to secure a uniform thickness of the insulation layer and the upper plain concrete, and improve structural safety.

In addition, the present invention relates to a method for constructing a floor of a refrigerated and low-temperature warehouse in which a heat insulating layer and unreinforced concrete are formed on the bottom surface of the foundation, and extruded styrofoam with linear grooves formed in a lattice shape for the purpose of passing water and ventilation on the bottom surface is molded as a material. The insulated drain plate is placed on the upper surface of the foundation, and a steel padistal is inserted through the through hole formed in the insulation drain plate to maintain verticality with respect to the upper surface of the foundation, and a tee is formed on the screw thread formed at the top of the support of the steel padistal. - Rotate the nut to adjust the upper level, maintain a uniform insulation thickness according to the T-Nut level of the steel padistal during the construction of the upper insulation layer, and after bonding the elastic rubber pad to the T-Nut, the insulation layer It is configured to include forming a finishing slab (reinforced concrete) thereon.

According to the present invention, there is no absorption rate at the top of the foundation where condensation water and leaks occur, there is no change in long-term thermal conductivity in repeated freezing and thawing environments, and an insulation drainage plate made of extruded styrofoam with ventilation and water passage grooves formed on the bottom surface. When installed on the upper surface or where thick insulation thickness is required according to the thermal transmittance required by refrigerated products, a synergistic effect can be obtained by utilizing the advantages and disadvantages of each insulation material by using the insulation drain plate and polyurethane spray coating in combination.

The lower part in contact with moisture (condensation water) is applied with an insulation drain plate molded from extruded styrofoam material, which has no change in long-term thermal conductivity because there is no absorption rate. With foamed polyurethane spray coating, it is possible to adhere closely to the floor and wall parts, the insulation drain plate joint part, and the padistal, so it is possible to secure airtightness that blocks the transfer of cold air in the freezer to the surroundings. By reducing, it is possible to obtain the effect of minimizing the shrinkage crack of the polyurethane spraying material generated during the operation of the freezer.

In addition, by fixing the support of the steel padistal on the upper part of the foundation by penetrating the insulation drain plate, it compensates for the insufficient compressive strength of the polyurethane spray coating installed on the insulation drain plate, and the unreinforced concrete layer that is placed on the insulation layer has a heavy loading load on the unreinforced concrete. It improves the resistance to tensile and bending stress caused by the load and absorbs the floor vibration that occurs when the tow truck is operated in the warehouse through the pad to solve the problem of cracks and floor loss in the plain concrete layer, and plate-shaped insulation manufactured at the factory. By reducing the on-site spraying thickness of the drainage plate and polyurethane foam to 100mm, which can be applied per day, it simplifies the on-site process to improve workability, uniform quality control, and cost reduction.

In addition, in the present invention, by diversifying the number and specifications of the pedestal, there is an advantage of enabling a flexible warehouse floor design in response to the ever-evolving logistics system.

1 is a schematic cross-sectional view of the structure of an existing low-temperature warehouse floor.
Figure 2 is a schematic perspective view of the PVC drain plate employed in Figure 1;
Figure 3 is a perspective view showing the installation of a steel padistal in the insulation drain plate according to the present invention.
Figure 4 is a perspective view of the insulation drain plate of Figure 3;
FIG. 5 is a perspective view of the bottom surface of the insulation drain plate of FIG. 4 , showing that ventilation and water passage grooves in a linear direction are formed in a lattice structure;
Figure 6 is a side view of a steel pedestal in which the anti-vibration rubber pad is disposed at the top in Figure 3;
7 to 9 are schematic construction process diagrams sequentially showing the construction of the frozen low-temperature warehouse floor structure according to the present invention.
10 is a schematic cross-sectional view showing that condensed water collected through ventilation and water passage grooves formed on the bottom surface of an insulated drain plate is discharged through a discharge pipe and a transverse main pipe in the frozen low-temperature warehouse floor constructed as shown in FIG.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings showing embodiments of the present invention.

First, a paper comparing the physical properties of polyurethane spray coating with a thickness of 100 to 250 mm, which has been constructed on the upper surface of the foundation as a floor insulation material in the floor structure of a refrigerated warehouse, and an extruded styrofoam insulation material used as an insulation drainage plate material of the present invention, 『Organic Insulation Material for Construction』 It can be seen in Table 1 below, excerpted from A Study on the Changes in Insulation Performance According to Accelerated Durability Conditions of

In Table 1, it can be seen that the absorption rate of the extruded styrofoam material of the present invention is relatively significantly lower than that of the polyurethane spray coating that has been previously used on the floor of a refrigerated and low-temperature warehouse.

In other words, the high absorption rate of polyurethane spray coating absorbs condensation water caused by the temperature difference between the base floor (ground) and the inside of the low-temperature warehouse. According to the present invention, according to the present invention, the heaving phenomenon in which the volume expands due to the freezing of the absorbed insulation material and lifts the upper plain concrete and the floor crack caused by this, first constructs an insulation drainage plate made of extruded styrofoam material on the upper surface of the foundation, and then an insulation layer of polyurethane spraying is applied thereon. solved by forming That is, as shown in Tables 2 and 3, condensation water is prevented from moving to the insulation layer of the polyurethane spray coating by the extruded styrofoam having a moisture-proof function, and thus the absorption of condensation water in the insulation layer of the polyurethane spray coating is prevented. The problem of the initial thermal conductivity due to water absorption rapidly rising from 0.020 W/(m k) to the long-term thermal conductivity of 0.043 W/(m k) has been solved, so that stable insulation properties can be maintained in the insulation layer composed of double insulation materials. do.

On the other hand, the extruded styrofoam without water absorption used as a material for insulation drainboards has an initial thermal conductivity of 0.028 W/(m k) and a long-term thermal conductivity of 0.032 W/(m k), which not only causes minor changes but rather low-temperature freezing temperatures. In an accelerated freezing and thawing environment such as a warehouse, it can be seen that the compressed styrofoam used as the material for the insulation drain plate has lower long-term thermal conductivity and higher compressive strength than polyurethane spray coating, so that more stable insulation performance can be maintained.

Furthermore, by using the two types of insulation materials together, the thickness of the polyurethane spraying can be significantly reduced, so that the heat of reaction generated during on-site foaming can be effectively discharged, and the shrinkage cracks of the polyurethane spraying that occur during the operation of the freezer can be reduced.

Physical properties of extruded styrofoam (XPS/No. 1) density
(kg/㎡) compressive strength
(N/cm2) absorption amount
(g/100cm2) initial thermal conductivity
(W/(m k) long-term thermal conductivity
(W/(m k) 34 31 0.1 0.028 0.032

Physical properties of polyurethane foam (PUR/Type 2 No. 2) density
(kg/㎡) compressive strength
(N/cm2) absorption amount
(g/100cm2) initial thermal conductivity
(W/(m k) long-term thermal conductivity
(W/(m k) 38 12 1.3 0.020 0.043

Long-term thermal conductivity change (standard environment VS freeze-thaw environment) Extruded Styrofoam (XPS) Polyurethane foam (PUR)

In Table 3 above, the line marked with a circle represents the change in long-term thermal conductivity in the standard environment, and the line marked with an inverted triangle represents the change in long-term thermal conductivity in the freeze-thaw environment.

2 to 6, the floor structure of the cold storage warehouse according to the present invention is impervious to the insulation drain plate 10 disposed on the floor of the warehouse, and the steel padistal ( 20), a heat insulating layer 40 formed by spraying polyurethane on the heat insulating drain plate 10 and a finishing slab (unreinforced concrete) formed on the heat insulating layer 40 and supported by the heat insulating layer and the steel padistal 20 after curing ) (50).

According to the present invention, the insulated drain plate 10 has insulating properties of low water absorption and high compressive strength, and grooves 11 and 12 having a semicircular cross section are formed in a linear direction and in a lattice form on the bottom surface in contact with the upper surface of the foundation In contrast, the grooves 11 and 12 are used for water and ventilation.

The steel padistal 20 is inserted into the hole 13 formed in the insulation drain board 10 to maintain verticality independently on the upper surface of the foundation, and to a predetermined height above the insulation drain board, that is, the insulation layer 40 formed on the insulation drain board A post 21 with a length protruding as much as the height of and a tee-nut 22 in the form of a head with an expanded radius at the top thereof, as described later, on the washer of the tee-nut 22, a pad of elastic rubber ( 23) is provided. The lower end of the steel pedestal 20 is supported on the upper surface of the foundation, and the tee-nut 22 is formed integrally with a nut and a washer having an extended radius, and the screw thread and tee-nut 22 at the top of the post 21 It is rotationally coupled with the inner screw, and the height can be corrected by rotating the tee-nut 22 when the smoothness of the top surface of the foundation is poor.

The hole 13 formed in the insulation drain plate 10 is perforated to insert a steel padistal, and at this time, the diameter of the hole 13 is smaller than the diameter of the padistal so that it can stand on its own when the steel padistal 20 is inserted. It is formed as small as 2~3mm and inserted by interference fit so that verticality can be maintained.

The pad 23 made of elastic rubber absorbs vibration generated when a forklift truck moves over the finishing slab (unreinforced concrete) and has low thermal conductivity, so that cold air in the freezer is transmitted to the steel padistal support 21 through the unreinforced concrete acts as a barrier.

In addition, the secondary pad 24 provided at the lower end of the post 21 serves to block the cold air transmitted to the post to the foundation and protects the waterproof layer installed on the top of the foundation.

The heat insulating layer 40 is formed by spraying foamed urethane on the heat insulating drain board 10 at the construction site, and the property of expanding the volume after foaming and adhesive strength are close contact with the floor and the wall part, the heat insulating drain plate joint part, and the steel pedestal Adhesion is possible, so it acts as an effect of blocking the transfer of cold air in the freezer to the surroundings.

In the heat insulating layer 40, reaction heat of 120° is generated in the process of mixing the two-component polyurethane raw material, and as a result, the upper skin of the lower extruded styrofoam insulation drain plate 10 is deformed (liquefied) by the reaction heat. However, there is no change in the overall shape and physical properties, and the viscosity generated by surface liquefaction strengthens the adhesive force with polyurethane to enable the formation of an integrated heat insulating layer.

7 to 9 show an insulated drainage plate according to the present invention and a floor construction method for a refrigerated low-temperature warehouse using the same.

First, after arranging the insulation drain board 10 on the upper surface of the foundation 30, insert the steel paddystal 20 through the hole 13 formed in the insulation drain board, and connect the upper screw thread of the post 21 to the lower level of the unreinforced concrete. Turn the tightened tee-nut 22 to match the level of the washer.

Then, after polyurethane spraying construction according to the level of the T-nut 22 of the steel padistal 20 inserted into the insulation drain plate, an elastic rubber pad 23 is attached on the upper washer of the T-nut 22, and the insulation layer ( 40) Pour the finishing slab (unreinforced concrete) 50 on top and cure it.

At this time, the diameter of the pad 23 is preferably about 10 mm wider than the diameter of the washer at the top of the tee-nut 22 to block cold bridges to the support 21.

As a result, the steel padistal 20, which is firmly supported on the upper surface of the foundation, responds to the tensile and bending stresses generated in the finishing slab (unreinforced concrete) 50 due to the load load, and the T-nut fastened to the top of the padistal The elastic rubber attached to the pad 23 absorbs the vibration generated in the finishing slab (unreinforced concrete) when the rafter moves in the warehouse, thereby preventing floor defects such as cracks or sagging of the unreinforced concrete.

In Figure 10, as shown in Figure 9 according to the present invention, the insulation layer 40 and the finishing slab (unreinforced concrete) 50 by polyurethane spraying in turn on the insulation drain plate 10 disposed on the upper surface 30 of the foundation In the cold storage floor constructed by forming, the condensation water generated on the top surface 30 of the foundation due to the temperature difference between the bottom surface of the insulation drain plate 10 and the bottom surface of the foundation (ground) forms a lattice shape on the bottom surface of the insulation drain board 10. It flows along the groove (11.12) in the straight direction of the water collected in the water collection pipe (110) embedded in the foundation concrete and discharged through the transverse main pipe (110). The grooves 11 and 12 may be used for passing condensed water and for ventilation.

In the past, a PVC drain plate of 100 to 250 mm was required for ventilation purposes, but the insulated drain plate according to the present invention is installed by embedding the discharge pipe 100 in the foundation for each predetermined area, so that only an appropriate amount of ventilation and water passage space is secured on the bottom of the insulated drain plate. The low-temperature air stagnant in the indoor house after being stagnant in the discharge pipe 100 embedded in the foundation concrete and the transverse main pipe 110 at a position lower than the upper surface 30 of the foundation and warmed to room temperature by the ground temperature (geothermal) Through a crystal or rooftop aspirator, negative pressure inside the pipe is formed according to the wind speed of the outside air and discharged to the outside air, thereby eliminating unnecessary additional excavation of the rock due to securing the area of the existing ventilation pipe and thus increasing the construction cost.

The present invention can be used to prevent problems caused by dew condensation occurring on the floor of a refrigerated warehouse, and cracks and fading of finishing slabs (unreinforced concrete).

10: insulation drain plate 11, 12: groove
13: Hall 20: Steel pedestal
21: support 22: tee nut
23: first pad 24: second pad
30: upper surface of foundation
40: insulation layer 50: finishing slab (unreinforced concrete)
100: discharge pipe 110: transverse pipe

Claims (4)

delete Grooves (11.12) are formed in the form of grids for water flow and ventilation on the bottom surface in contact with the upper surface of the foundation of the freezer warehouse, made of extruded styrofoam in a rectangular shape with insulation properties and extremely low absorbency over time, and finishing slab Refrigerated warehouse floor construction including a steel pedestal 20 installed to be supported on the warehouse foundation floor by being inserted into the hole 13 formed in the insulation drain plate 10 to have a response to tensile and bending stress generated in In the insulation drain plate for
The steel pedestal 20 includes a post 21 with a length protruding as high as the height of the heat insulating layer 40 formed on the heat insulating drain plate and a T-nut 22 having a head with an expanded radius at the top thereof,
Insulated drainboard, characterized in that a pad (23) of elastic rubber is provided on the tee-nut (22).
According to claim 2,
The tee-nut 22 is coupled to the support 21 in a configuration in which a nut and a washer having an expanded radius are formed integrally, and the height of the pedestal 20 is adjusted by rotating the tee-nut according to the height of the heat insulating layer 40. Insulation drainboard, characterized in that to be able to.
In the method of constructing a floor of a refrigerated low-temperature warehouse by forming a heat insulation layer and unreinforced concrete on the floor of the foundation,
A heat insulation drain plate 10 molded from extruded styrofoam is placed on the upper surface 30 so that grooves 11 and 12 are formed on the bottom surface as guides for water and ventilation,
The padistal 20 is inserted through the hole 13 formed in the insulation drain plate 10 to be supported on the bottom of the foundation, and the top level is adjusted by rotating the tee-nut 22 at the top of the steel padistal,
The heat insulating layer 40 is formed to maintain a uniform spraying thickness according to the level of the T-nut 22 of the pedestal 20, and the pad 23 of elastic rubber is adhered on the T-nut 22,
Frozen low-temperature warehouse floor construction method, characterized in that formed by pouring the rootless concrete layer (50) on the heat insulating layer (40).

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