JPH0544201A - Heat insulating floor panel and construction thereof - Google Patents

Abstract

PURPOSE:To obtain a high-strength heat insulating floor panel having high heat conductivity to the surface. CONSTITUTION:A light-weight precast concrete lower floor panel 3 formed in a factory is fixed to bridge girders 1, and a hot water pipe 4 is set above the floor panel 3. An upper layer floor panel 5 of ordinary concrete is placed in such a way as to bury the pipe 4 in the recession 3a of the floor panel 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulation floor plate for roads, bridges, buildings, etc., in which hot water pipes for heat insulation are buried, and particularly to a heat insulation floor plate suitable for use in bridges in cold regions and a construction method thereof. Is.

[0002]

2. Description of the Related Art In general, concrete floor boards for buildings in cold regions and roads, bridges, and other floor plates in cold regions with a lot of snow are buried with a hot water pipe in the concrete for the purpose of heat retention and snow melting when placing concrete. Is being done. Especially when there is snow on the road surface and on the bridge, it melts relatively quickly on the road surface with geothermal heat, but on the open-air bridge with no heat source, the snow melts slowly and a traffic accident due to slip occurs. Many construction methods are adopted.

[0003]

However, in the conventional construction method of this kind, since the ordinary concrete having a large thermal conductivity is used as the concrete for burying the hot water pipe, the heat of the hot water pipe is applied to the surface side of the concrete. By being distributed and transmitted to the back side,
As a result, there is a problem that the amount of heat transferred to the surface side is small, snow melting is delayed, and a traffic accident due to slip cannot be avoided.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a high-strength heat insulating floor plate capable of improving heat conduction to the surface and a method of constructing the same.

[0005]

In order to achieve such an object, according to the present invention, a heat insulating floor board is a lower floor board made of precast lightweight concrete supported by a support member and an upper floor board made of ordinary concrete in which a hot water pipe is embedded. It was formed by stacking and. In addition, as a construction method of the heat insulation floorboard, a lower layer floorboard made by precasting method using lightweight concrete is laid, a hot water pipe is installed above this lower floorboard, and an upper layer of normal concrete is used to bury this hotwater pipe. The method of placing the floorboard was adopted.

[0006]

[Function] A lower floor plate manufactured by a precast method using lightweight concrete in a factory or the like is fixed on a supporting member such as a bridge girder, and a hot water pipe is installed above this lower floor plate. Heat-insulating floorboards can be obtained by placing ordinary concrete, but since heat transfer and heat diffusion to the lower floorboard side made of lightweight concrete with low thermal conductivity are small, the heat of the hot water pipe has high thermal conductivity. It is quickly transferred to the surface of the normal concrete upper floor board, that is, the surface of the heat insulation floor board, and the temperature of this surface rises.

[0007]

1 and 2 show an example in which the heat insulating floor plate according to the present invention is applied to a floor plate of a bridge shown for explaining a heat insulating floor plate construction method according to the present invention. FIG. 1 is a sectional view of the heat insulating floor plate.
FIG. 2 is a perspective view of the lower floor board. In the figure, 1 is a bridge girder of a bridge formed in an I-shaped cross-section, and a lower floor plate 3 having a U-shaped cross-section, which constitutes a heat insulating floor plate generally designated by 2, is fixed to the upper surface of the bridge girder 1. And this lower floor board 3
Is manufactured in a factory, transported to the site, and installed. The lower floor board 3 is precast in a factory with lightweight concrete using structural artificial lightweight aggregate obtained by granulating and firing coal ash as a raw material, and the lightweight concrete has a low thermal conductivity. Since the thermal conductivity increases when the concrete absorbs water, it is desirable that the aggregate used for the lightweight concrete has a water absorption rate as small as possible, such as an aggregate made of coal ash. Further, it is also effective to apply a means for reducing the water absorption of the lightweight concrete, that is, apply a water repellent, impregnate, waterproof coating or the like.

A plurality of hot water pipes 4 made of stainless steel connected to a hot water source (not shown) are supported on the bridge girder 1 side above the lower floor plate 3 fixed to the bridge girder 1 in this way, for example, at intervals of 30 cm. The upper floor plate 5 made of normal concrete is placed in the recess 3a of the lower floor plate 3 with the hot water pipe 4 buried therein.

A method of constructing the heat insulation floorboard configured as described above will be described. In the factory, since the lower floor plate 3 made of lightweight concrete having the above-described composition is manufactured by precasting, the lower floor plate 3 is transported to the site and fixed to the bridge girder 1 with bolts or the like. Next, a hot water pipe 4 supported on the bridge girder 1 side is erected in the recess 3a of the lower floor plate 3, and then the upper bottom plate 5 made of normal concrete is embedded in the recess 3a of the lower floor plate 3 while the hot water pipe 4 is buried.
After the concrete is set inside and the concrete is hardened, the construction is completed by connecting the hot water pipe 4 to the hot water source.

When hot water is passed through the hot water pipe 4 after the construction in this way, in this case, the lower floor plate 3 is made of lightweight concrete having a small thermal conductivity, and the upper floor plate 5 has a thermal conductivity of Due to the fact that it is made of large ordinary concrete, the heat of the hot water pipes 4 is
Since it is not so much transmitted to the side of the upper floor plate 5 and much is transmitted to the side of the upper floor plate 5, the surface of the upper floor plate 5 quickly rises in temperature and quickly melts in the presence of snow.

Suppose now that, as shown in the conventional example, the heat insulating floor plate whose whole floor plate is made of normal concrete is NN, the heat insulating floor plate whose whole floor plate is made of lightweight concrete is LL, and like the present invention. The following experiment was conducted by setting the heat insulation floorboard in which the lower floorboard is made of lightweight concrete and the upper floorboard is made of normal concrete as NL. That is, the surface of each of these heat insulation floorboards is paved with asphalt, the outside air temperature is kept constant at 5 ° C, and the temperature of hot water passing through the hot water pipes embedded in each heat insulation floorboard is 20 ° C.
When the surface temperature of asphalt is measured as C, it is always N
L>NN> LL, and the temperature of the bottom surface of the floorboard is always NN.
>NL> LL. The surface temperature after 6 hours is 10 ° C. for NL, 8 ° C. for NN, and 5 ° C. for LL, demonstrating that the surface temperature is highest in the case of this device.

In this embodiment, the present invention is applied to the floor boards of bridges, but it can be applied to the floor boards of roads and buildings, and the same effect can be obtained.

[0013]

As is apparent from the above description, according to the present invention, a heat insulation floorboard is formed by laminating a lower-layer floorboard made of precast lightweight concrete supported by a supporting member and an upper-layer floorboard made of ordinary concrete in which a hot water pipe is embedded. In addition, as a construction method of the heat insulation floorboard, a lower layer floorboard manufactured by precast method using lightweight concrete is laid and a hot water pipe is installed above this lower layer floorboard By adopting the method of placing the upper floor board using concrete, the heat of the hot water is less likely to be released to the bottom of the heat insulating floor board and is easily transferred to the surface of the heat insulating floor board, so the heat insulating effect of the heat insulating floor board surface is improved. In the case of snow, this snow melts quickly and it is possible to prevent traffic accidents due to slip.
Further, since the lower floor board is manufactured by precasting, the dimensional accuracy is improved and the joining with the supporting member is facilitated. Furthermore, since ordinary concrete that serves as the upper floor board is placed on the lower floor board at the site, the connection between the lower floor boards divided into several pieces is strengthened, and the rigidity of the entire heat insulation floor board is improved.

[Brief description of drawings]

FIG. 1 is a sectional view of a heat insulation floorboard according to the present invention, which is shown for explaining a heat insulation floorboard construction method according to the present invention.

FIG. 2 is a perspective view of a lower floor plate in the heat insulating floor plate according to the present invention, which is shown for explaining a heat insulating floor plate construction method according to the present invention.

[Explanation of symbols]

 1 Bridge girder 2 Heat insulation floor board 3 Lower floor board 4 Hot water pipe 5 Upper floor board

Claims (2)

[Claims] 1. A heat-insulating floorboard, which is formed by laminating a lower-layer floorboard made of precast lightweight concrete and an upper-layer floorboard made of normal concrete in which a hot water pipe is buried. 2. A method of laying a lower layer floorboard made of lightweight concrete by a precast method, laying a hot water pipe above the lower layer floorboard, and driving an upper layer floorboard of ordinary concrete so as to bury the hot water pipe. A method of constructing a characteristic heat insulation floorboard.