JPH07119111A - Construction method of road heating and substrate material - Google Patents

Abstract

PURPOSE:To make it possible to construct a concrete layer which envelops a heat source irrespective of any shape of a construction area extremely in a short time and melt layer more efficiently snow accumulated on a prior art concrete. CONSTITUTION:Crushed stones are laid out on an excavated bottom surface where a thin aluminum-foil is installed to the top of the crushed sines, thereby forming an insulation lower layer 20. On the other hand, a heating means is installed to the top of the aluminum foil by way of a mesh material while a thin film material, which is water permeable is installed on the heating means. A mixture of sand and cement at a mixing rate of 3:1 and in a dried state, is installed thereon, thereby forming an insulation upper layer 19. A surface finishing material is installed to the insulation upper layer. An aluminum material is molded so as to shape a spiral foil which is 0.5 to 1.5mm thick in wall thickness and 3 to 7mm wide between the upper and lower layers. To enhance a snow melting efficiency, the aluminum material may be mixed with at least either transmission metal or silica.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a road heating construction, and more particularly to a technique for improving the workability around a heating pipe.

[0002]

2. Description of the Related Art In the construction of road heating, it is important to first achieve good thermal efficiency and secondly to simplify construction.

FIG. 3 shows another example of a conventional construction method, in which a hot water pipe 2 is passed through a block body 1 having a predetermined size,
The construction is carried out efficiently by laying a large number of the blocks (Japanese Utility Model Publication No. 51-53094).

FIG. 4 shows another example of the conventional construction method, in which the upper layer A and the lower layer B are formed on both sides of the heat source 3 so that the upper layer A has high thermal conductivity. , Lower layer B
Has a function to prevent heat radiation (Actual Koho 48-125)
No. 38). The upper layer A is made by kneading the coarse aggregate 4 with cement, synthetic resin and gypsum, while the coarse aggregate 4 is made of earth, stone, metal or the like having high heat conductivity. One lower layer B is
The coarse aggregate 5 is made of volcanic rubble sand, permilite, perculite, expansive shale, etc., which has a high heat insulating property, and prevents the heat of the heat source 3 from escaping into the soil.

[0005]

However, each of the conventional road heating construction methods has the following problems.

First, a hot water pipe is arranged in a block and the block is laid. However, this often cannot cope with the shape of the laying site, and it is necessary to connect the hot water pipes between adjacent blocks. , There is a problem such as poor workability. The laying site has various areas and shapes, and a block shape cannot be assumed in advance. Therefore, the area where the blocks can be laid is limited to a predetermined range in which the rectangular block can be fitted, and the block body cannot be laid on the outer peripheral portion thereof. If you try to lay it out to order, the cost will increase. Further, since a joint for the hot water pipe is required, the work of connecting this portion is complicated and the workability is not always good. In addition, after construction, if a heavy load is applied to the road surface or the ground changes due to an earthquake or the like, there is a high possibility that the joint will loosen and cause water leakage.

On the other hand, a method of forming a heat transfer layer and a heat insulating layer above and below a heat source is possible, but this is more effective than general concrete construction in terms of thermal efficiency. However,
Since the basic material for both the upper and lower layers is cement, which is cast after adding water and kneading, there is a problem that concrete curing takes time and winter construction cannot be performed. One of the obstacles to winter construction is that heating and curing to prevent the water in the cast concrete from freezing freezes, which is costly and complicated to manage. On the other hand, the concrete water freezes when no such work is required. Then, a large number of minute cracks are generated, and thereafter, the load is applied to the road surface to promote the destruction, which causes problems such as deformation and destruction of the heat source. For this reason,
In the description of the third embodiment, it is explained that the upper and lower layers are molded as blocks using a mold. However, the problem of the block material is as described above, and the workability of the joint is poor. When arranging electric resistance wire, insulation etc. of the connection part,
In a meaning different from the hot water pipe, the work cost is high and there is a possibility of disconnection.

As described above, the reason why the block construction is proposed even though the cost is high and the laying area is limited and the connection of the heat source is complicated is that the concrete curing at the pouring site requires a long time and the passage is continued during that time. This is because there is a problem in that the cast concrete layer is destroyed and cracks are generated in the surface roadbed when sufficient curing is not performed. In addition, it is not possible to adopt a construction method in which a heat insulating material such as Styrofoam is placed under the heat source, because the heat insulating resin layer blocks moisture and water accumulates around the heat source (resistance wire, hot water pipe) and freezes. It is now known that the heat source will be damaged.

Therefore, an object of the present invention is to make it possible to construct a concrete layer surrounding a heat source in an extremely short time regardless of the shape of the laying area, while increasing the snow melting efficiency more than the conventional concrete layer.

[0010]

Means for Solving the Problems In order to achieve the above-mentioned object, a method of constructing a road heating according to the present invention is as follows. While forming the side layer, a heating means is arranged on the upper surface of the aluminum foil via a mesh material, a water-permeable thin film material is arranged on the heating means, and about 3: Dry sand and cement mixed in a ratio of 1 are arranged to form a heat insulating upper layer, and a surface finishing material is applied on the heat insulating upper layer. The aluminum material to be placed on the ground is formed by spirally forming a tape-shaped aluminum foil having a wall thickness of 0.5 to 1.5 mm and a vertical width of 3 to 7 mm, and the horizontal dimension of the spiral is 5 to 5. It may be 15 mm. Further, in order to improve the snow melting efficiency, the aluminum material may be mixed with at least one of transition metal and silica.

[0011]

[Function] The thin aluminum material that is placed on the ground to form the heat insulating lower layer functions as a cushioning material at the beginning of construction and also functions to increase the heat efficiency by radiating the heat absorbed from the heating means. . On the other hand, the heat insulating upper layer formed on the upper side of the heating means such as a hot water pipe shows high heat insulating property due to the large number of voids between particles at the beginning of construction, and the large number of voids efficiently heat the heating means up to the surface path. To reach. Further, although the heat insulating upper layer does not contain water even though it is made of cement, it does not freeze even during winter construction and does not require curing.

On the other hand, when the upper and lower layers are formed in this manner, the moisture in the soil gradually evaporates and the moisture gradually permeates into the cement in the heat insulating upper layer, and the upper cement layer starts the solidifying action over a long period of time. At this time, the cement that has absorbed the water permeates downward by the action of gravity and reaches the aluminum layer to start solidifying the lower layer portion.

At the same time, some bacteria (microorganisms) existing in the soil begin to eat the aluminum foil arranged on the ground. Aluminum foil gradually solidifies due to the cement layer over time, but since the aluminum itself is eroded by microorganisms, the cement that solidifies in the lower layer in 3 to 6 years , Will have innumerable erosion paths due to microbial erosion. This erosion path extends infinitely in all directions up, down, left and right. The insulating upper layer is not susceptible to microbial erosion. However, since the original material is a dry cement material, the eyes become coarse, and they solidify while forming a large number of minute voids even during solidification.

It takes about 3 to 6 years until the upper and lower layers are completely solidified and the aluminum material is not completely eroded. During this period, the concrete layer gradually increases the number of micro cavities. Unlike the cracks, the small cavities formed in the concrete layer do not lead to the destruction of the concrete layer. In addition, the air stored in the micro cavities enables the concrete layer to function as a heat insulating material by itself and prevent unnecessary heat dissipation from the heat source, while allowing heat to be released from the micro cavities, so that heat transfer to the surface base course is possible. Do it efficiently and improve snow melting efficiency.

The aluminum material as the base layer initially serves as a cushion material, and after that, erodes microorganisms. This aluminum material may be a simple chip material, but in order to make it work more functionally, it should be molded into a shape with a three-dimensional spread, for example a spiral shape, so that it has more voids. desirable. In addition, since the erosion (or corrosive action) of microorganisms takes a long time, the cement material invades the cavity during that time. As a result, the final cavity shape does not necessarily match the shape of the aluminum material. In order to function as a cushioning material and to properly adjust the erosion cavity diameter due to microorganisms, it is necessary to set the wall thickness, vertical width and horizontal dimension of the aluminum material to a single predetermined length. The most preferable result can be obtained.

When a transition metal such as nickel, manganese or copper or a far infrared ray emitting material such as silica is mixed with an aluminum material, snow melting efficiency is further enhanced.

[0017]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a construction example of road heating according to the present invention, in which an aluminum chip is placed on a base material 10 made of sand and gravel to form a heat insulating lower layer 20,
The heat insulation lower layer 20 is covered with the metal mesh sheet 14, and then the hot water pipe 16 is arranged. Then, an air-permeable net 17 is arranged to suppress the movement of the hot water pipe 16, and dry powder particles in which sand and cement are mixed are deposited on the net 17 to form the heat insulating upper layer 19. After that, the ground is leveled with a roller or the like to cover the surface with the asphalt R.

This construction work is completed in an extremely short time.
This is because the heat insulating upper layer 19 does not need to be cast by conventional concrete, but only needs to be sprayed with dry cement and sand, and it can be ground as it is and immediately covered with asphalt R. Here, it is desirable that the aluminum chips forming the heat insulating lower layer 20 have a shape having a space inside as much as possible.

Therefore, as the aluminum scraps constituting the heat insulating lower layer 20, for example, as shown in FIG. 2, spiral scraps of uniform length are used. This aluminum scrap 21
Is a tape-shaped aluminum foil having a wall thickness of about 0.5 mm and a vertical width (W) of about 5 mm, and is formed into a spiral shape that rotates about three times. The horizontal dimension (L) of the spiral is set to about 10 mm, for example. These dimensional values can be appropriately set and changed according to the usage environment.

The construction method according to the present invention is characterized in that the construction procedure is simple and that the snow melting efficiency is gradually improved after construction. This action is as follows.

First, in the initial state of construction, the aluminum material 21 of the heat insulating lower layer 20 radiates and radiates the heat absorbed from the hot water pipe 16. As a result, the heat loss of the hot water circulating in the hot water pipe 16 is minimized. Further, the heat insulating upper layer 19 and the asphalt R are warmed by the radiant heat of the aluminum material 21 itself, and the snow melting efficiency is further enhanced. On the other hand, the heat insulating upper layer 1
At the beginning of construction, No. 9 exhibits high heat insulation due to the large number of voids between particles. Further, the heat of the hot water pipe 16 and the heat of the aluminum material 21 efficiently reach the asphalt R by the large number of voids.

When the upper and lower layers 19 and 20 are formed in this way, the heat insulating upper layer 19 is vaporized immediately after construction due to vaporization of moisture in the soil.
Moisture gradually penetrates into the cement of the upper cement layer (1
9) starts the solidification action. At this time, the cement that has absorbed the water penetrates downward due to the action of gravity, reaches the aluminum layer, and also starts to solidify the lower layer portion 20. The time required for the lower aluminum layer to be completely solidified with concrete is about 1 to 6 years, and the slow solidification process proceeds. During this time, the thermal action as described above continues.

Simultaneously with this solidifying action, certain bacteria (microorganisms) existing in the soil are converted into aluminum material 2
Start eating (or corrode 1; the same hereafter). Due to the erosion (or corrosion) of aluminum by the microorganisms, the solidified cement portion of the heat insulating lower layer 20 forms innumerable erosion paths. The erosion path extends infinitely in all directions in all directions.
The time it takes for the microorganisms to finish eating the aluminum material 21 is approximately 3 to
6 years. No aluminum material 21 remains on the heat-insulated lower layer 20 that has been completely eroded. Only the erosion path remains. The heat insulating upper layer 19 is not eroded by microorganisms. But,
Since the original material is a dry cement material, it has a coarse mesh, and it solidifies while forming a large number of minute voids even during solidification.

During the erosion of the aluminum material by microorganisms, the upper and lower concrete layers (19, 20) gradually increase the number of micro cavities. Air is stored in the micro-cavities formed in the concrete layer. Due to this air layer, the upper and lower concrete layers (19, 20) function as a heat insulating material and prevent unnecessary heat dissipation of the heat source, while allowing heat to be released from the minute cavities, thereby increasing the heat transfer efficiency to the asphalt R. Improve.

Therefore, according to this construction method, as the erosion of the aluminum material 21 by the microorganisms progresses and a large number of minute cavities increase in the concrete layer, the snow melting efficiency further increases. In other words, even in the initial stage of construction, it exhibits high thermal efficiency with voids that are larger than those of conventional construction concrete, but over the years, thermal efficiency will continue to improve. When the upper and lower concrete layers (19, 20) are completely solidified and the aluminum material 21 is completely eroded,
The thermal efficiency will show the maximum characteristics.

When a general snow melting boiler is operated in the severe winter season in Hokkaido, the temperature of the hot water normally rises to about 70 ° C. at most, and 40 times after the boiler is started before reaching the maximum temperature. It takes about a minute. However, it has been confirmed that, in the area where this construction was carried out, a high temperature of 70 ° C or higher was reached in about 17 minutes using the same type of boiler, and snow could be rapidly melted. It goes without saying that the fuel efficiency of the boiler is significantly improved.

Further, according to this construction method, the shape of the construction area is not limited, and the number of joints of the hot water pipes can be minimized. The heating means is not limited to the hot water pipe, and a heating wire may be used. This construction does not require concrete curing. For this reason, it is possible to perform the construction even in the difficult winter period such as the severe winter. This is because there is no risk of freezing of concrete water. Moreover, since concrete curing is not required, the construction time can be dramatically reduced. Further, since it is not necessary to add water to knead the concrete, there is no need for the trouble of placing concrete and the working cost is reduced.

In order to enhance the snow melting efficiency in the initial stage after the completion of construction, it is desirable to enhance the heat radiation effect of the aluminum material. For this reason, the aluminum scrap 21 may be mixed with a certain kind of material having a far infrared ray emitting effect, for example, a transition metal or silica. The transition metal includes, for example, nickel, cobalt, iron, magnesium, zinc, manganese, titanium, lead, and the like, and by mixing a trace amount of these metals, the aluminum scrap 21 transfers more absorbed heat to the outside. discharge.

Silica (silicon), divalent and trivalent iron salts, and platinum are substances having the same function. On silica,
When a transition metal, platinum, or a divalent or trivalent iron salt is mixed and the mixed substance is added to aluminum, the far infrared ray emitting action is further enhanced. In this case, the aluminum component ratio is 55% to 99%, and the aluminum ratio can be appropriately increased or decreased according to the use environment. The far infrared effect increases as the mixing ratio of aluminum decreases.

This far-infrared effect is a relatively early effect from the completion of construction until about three years have passed. Therefore, in order to enhance the heat insulation effect thereafter, the aluminum component is increased to extend the erosion path. Therefore, the distribution ratio of aluminum must be changed according to the usage environment and specification conditions.

The mesh material placed on the aluminum material is
It prevents the hot water pipe (or heating wire) from settling.
This material is not limited in its type, such as a metal mesh, a linen cloth, and a resin fine thread mesh, as long as it can permeate water in the soil and does not prevent the natural settlement of cement and the activity of microorganisms. The thin film material placed on the heating means (pipe or heating wire) is used to prevent the dry cement powder particles from falling and falling off rapidly, so use permeable linen cloth, paper, metal or resin mesh. You can do it.

[0032]

As described above, according to the road heating construction method of the present invention, it is possible to construct the concrete layer surrounding the heat source in an extremely short time regardless of the shape of the laying area, and it is possible to melt the snow. Efficiency will also increase dramatically.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a construction example of road heating according to the present invention.

FIG. 2 is a perspective view showing an example of an aluminum material according to the present invention.

FIG. 3 is a diagram showing a conventional road heating construction technique.

FIG. 4 is a diagram showing a conventional road heating construction technique.

[Explanation of reference numerals] 10 base material 14 sheet 16 hot water pipe 17 net 19 heat insulating upper layer 20 heat insulating lower layer

Claims (3)

[Claims] 1. A crushed stone is laid on the bottom surface of the dug, a thin aluminum foil is laid on the crushed stone upper surface to form a heat insulating lower layer, and heating means is provided on the upper surface of the aluminum foil via a mesh material. The water-permeable thin film material is arranged on the heating means, and dry sand and cement mixed at a ratio of about 3: 1 are arranged on the heating means to form a heat insulating upper layer. A method of applying road heating, characterized in that a surface finishing material is applied on the heat insulating upper layer. 2. The aluminum material arranged on the ground has a wall thickness of 0.
It is formed by spirally forming a tape-shaped aluminum foil having a width of 5 to 1.5 mm and a vertical width of 3 to 7 mm, and the horizontal dimension of the spiral is 5
A base material for road heating, which is characterized by having a length of up to 15 mm. 3. The base material for road hitting according to claim 2, wherein the aluminum material is a mixture of at least one of a transition metal and silica.