JPH0853807A - Antifreezing method of road in the vicinity of tunnel entrance - Google Patents

Abstract

PURPOSE:To utilize the geothermal energy to prevent freezing of a road in the vicinity of a tunnel entrance at a low cost. CONSTITUTION:In an antifreezing method of a road 3 in the vicinity of a tunnel entrance 7, a group of snow-melting pipes 11 and 13 consisting of a large number of buried snow-melting pipes are provided downward of the road 3 in the vicinity of the tunnel entrance 7, and a large number of holes are bored in wall surfaces 5A and 5B in a tunnel 5 at specific intervals lengthwise of the inside of the tunnel 5. Geothermal energy absorption pipes 23 are inserted in every hole to provide a group of geothermal energy absorption pipes 15 and 17 to the wall surfaces 5A and 5B in the tunnel 5, and after water is circulated in a group of geothermal energy absorption pipes 15 and 17, it is circulated in a group of snow-melting pipes 11 and 13. According to the constitution, water is circulated between a group of geothermal energy absorption pipes 15 and 17 and a group of snow-melting pipes 11 and 13.

Description

Detailed Description of the Invention

[0001]

[Industrial application] The present invention relates to a method for preventing freezing of a road surface near a tunnel entrance.

[0002]

2. Description of the Related Art In a cold region, in order to prevent the freezing of the road surface, for example, an electric heating cable system in which a heating cable is buried in the road surface, or hot water heated by a heat source facility by burying a pipe in the road surface is circulated in this pipe Various methods such as a hot water circulation cheek method and a water spray method for spraying water on the road surface are provided.

[0003]

However, in the electric heating cable system, a substation facility for energizing the heating cable must be installed, and since electric power is required at the time of operation, operating cost is high and there is a cost problem. . In addition, in the hot water circulation cheek method, heat source equipment for heating water must be installed, and operating costs are incurred because fuel such as oil is burned during operation. There is. Further, in the sprinkling method, since water is simply sprinkled, the cost is low, but there is a problem that the road surface freezes when the temperature is low.

On the other hand, the temperature in the ground is almost constant throughout the year, and even if the road surface is frozen, the temperature in the ground is maintained at about 14 to 15 ° C., for example. Also, the tunnel was originally excavated underground,
The above-mentioned underground temperature, that is, the geothermal heat is easily taken out from the tunnel. The present invention was devised by focusing on the geothermal heat and the tunnel, and an object of the present invention is to utilize the geothermal heat at a low cost to prevent the freezing of the road surface near the tunnel entrance near the tunnel entrance. It is to provide a method for preventing freezing of a road surface.

[0005]

In order to achieve the above object, the present invention is a method for preventing the freezing of a road surface near a tunnel wellhead, which is for a large number of snowmelts buried under the roadway near the tunnel wellhead. A group of pipes for snow melting consisting of pipes are installed, a large number of holes are bored on the wall surface in the tunnel pit at intervals in the longitudinal direction of the tunnel pit, and a geothermal absorption pipe is inserted into each of the holes to absorb the geothermal heat. The pipe group for installation is installed on the wall surface in the tunnel mine, water is circulated through the pipe group for absorbing geothermal heat, and then circulated through the pipe group for melting snow, and thus the pipe group for absorbing geothermal heat and the pipe for melting snow are provided. It is characterized in that water is circulated between the group. Further, the present invention, a plurality of pipes for snow melting are provided side by side in the longitudinal direction of the road surface, and a plurality of pipe groups for geothermal absorption are provided on the wall surface in the tunnel pit corresponding to the number of pipe groups for snow melting, each. It is characterized in that water is individually circulated between the group of pipes for melting snow and the corresponding group of heat absorbing pipes.

[0006]

The water heated by the geothermal heat is circulated below the road surface, thereby heating the road surface and preventing freezing.

[0007]

The method according to the present invention will be described below with reference to the accompanying drawings. 1A is a schematic plan view of a tunnel and a road portion to which the method of the present invention is applied, and FIG. 1B is a side view of the same.
2 is a front view of the same, and FIG. 3 is a plan view of a piping system. Reference numeral 1 is a road, 3 is a road surface, 5 is a tunnel, 7 is a tunnel wellhead, and two snowmelt pipe groups 11 and 13 are buried in the longitudinal direction of the roadway 1 below the roadway surface 3 near the tunnel wellhead 7, Also, on both left and right wall surfaces 5A and 5B in the tunnel 5,
Geothermal absorption pipe groups 15 and 17 are buried respectively.

Each of the snow melting pipe groups 11 and 13 is shown in FIG.
As shown in FIG. 1, a large number of snow melting pipes 21 extending in the width direction of the road surface 3 are embedded below the road surface 3 at intervals in the longitudinal direction of the road 1, and are located at one end of the road 1 in the longitudinal direction. When water is supplied to the snow melting pipe 21A, the water circulates sequentially through the adjacent snow melting pipe 21 and reaches the snow melting pipe 21B located at the other end in the longitudinal direction of the road 1,
Both ends of each snow melting pipe 21 are connected to the ends of the adjacent snow melting pipes 21.

The heat absorbing pipe groups 15 and 17 are
On the wall surfaces 5A and 5B in the tunnel 5 pit, it is composed of a large number of geothermal absorption pipes 23 that are buried vertically at intervals and at intervals in the longitudinal direction of the tunnel 5. When burying the geothermal heat absorption pipe 23, as shown in FIG.
Is bored laterally on the wall surfaces 5A and 5B in the tunnel 5 pit,
The geothermal absorption pipe 23 is inserted into the hole 24.
The geothermal absorption pipe 23 is composed of a tubular body portion 25 having a predetermined length, a bottom portion 27 at the tip, and a disc-shaped lid portion 29 attached to the opening at the base end. 29 has two holes 3
1, 33 are formed. Geothermal absorption pipe 23
Is inserted from the bottom 27 into the hole 24, and the lid 29 is disposed so as to face the wall surfaces 5A and 5B of the tunnel 5.

A pipe 35 is liquid-tightly inserted from one hole 31 of the lid portion 29 into the geothermal absorbing pipe 23, and a tip end opening 3501 of the pipe 35 faces the bottom portion 27 and is exposed from the lid portion 29. The pipe portion 3503 is formed in a curved shape, and a flange 37 for connection is attached to the tip thereof as shown in the arrow A view of FIG. 4 in FIG. Lid 2
A pipe 41 curved in a direction opposite to that of the pipe portion 3503 is projected from the other hole 33 of 9, and a flange 43 for connection is attached to the tip of the pipe 41. The pipe 41 includes a flange 43 and a connecting pipe 4.
5, is connected to the pipe 35 of the geothermal absorption pipe 23 which is horizontally adjacent via the flange 37, and thus,
The adjacent geothermal absorption pipes 23 are connected to each other through the pipe 41, the flange 43, the connecting pipe 45, the flange 37, and the pipe 35, and as shown in FIG. 3, water flows through the lower pipe row 23A. After being circulated, the heat absorbing pipe groups 15 and 17 are configured to circulate in the upper pipe row 23B.

As shown in FIG. 3, the two snow melting pipe groups 11 and 13 and the two geothermal absorption pipe groups 15 and 17 are individually connected. In the embodiment, the pipe group 11 for snow melting buried in the road surface 3 portion facing the inside of the tunnel 5 pit and the pipe group 15 for geothermal absorption buried in the wall surface 5A on the left side inside the tunnel 5 pit are connected via the pipe line 51. In addition, the pipe group 13 for snow melting buried in the road surface 3 part away from the tunnel 5 pit and the pipe group 17 for geothermal absorption buried in the wall surface 5B on the right side in the tunnel 5 pit are the pipeline 5
3 are connected. More specifically, the water that circulates in the upper pipe row 23B of the heat absorption pipe groups 15 and 17 is the tunnel 5 of the snow melting pipe groups 11 and 13.
Is supplied to the snow melting pipe 21A located at the end on the side away from the snow melting pipe 21B located on the tunnel 5 side of each snow melting pipe group 11 and 13 Lower pipe row 23A of groups 15 and 17
Are connected to each other by pipelines 51 and 53, and a pump P is provided in each pipeline 51, 53.

According to the present embodiment, the water is circulated through the lower pipe row 23A and the upper pipe row 23B of each heat absorption pipe group 15 and 17 by the driving of the pump P, and then each snow melting pipe group. After being supplied to 11, 13 and circulating through each of the snow melting pipe groups 11, 13, the heat absorbing pipe groups 15,
It is circulated to 17, and such circulation is repeated. Then, when circulating through the heat absorption pipe groups 15 and 17, water flows out from the tip end opening 3501 of the pipe 35 to the bottom portion 27 of the geothermal absorption pipe 23, passes through the body portion 25, and the pipe 41 and the connection pipe 45. , Is discharged from the pipe 35 to the bottom portion 27 of the adjacent geothermal absorption pipe 23, and thus circulates to the adjacent geothermal absorption pipe 23, and passes through the body portion 25 of each local heat absorption pipe 23. In doing so, heat is exchanged with the ground, whereby the geothermal heat is conducted to the water and the water is heated to about 14 to 15 ° C. Then, this heated water passes through the pipe lines 51 and 53 to each snow melting pipe group 1
Water supplied to Nos. 1 and 13 and heated is the snowmelt pipe group 1
By circulating 1 and 13, the road surface 3 is heated and freezing is prevented.

According to the method for preventing freezing of the road surface according to this embodiment, the water is heated by utilizing the geothermal heat, and the water is simply pumped by the pump P.
Since the road surface 3 is heated by being circulated by, the operation cost is extremely low when the road surface 3 is prevented from freezing, and the maintenance and inspection can be easily performed. In addition, geothermal heat absorption pipe group 1
When installing 5, 17, a hole is drilled in the tunnel wall surfaces 5A, 5B using the drill for use in the tunnel 5 construction, and the geothermal heat absorption pipe 2 is formed on the tunnel wall surfaces 5A, 5B.
Since 3 can be buried, it can be easily installed without preparing any special device or equipment, and the cost can be reduced.

[0014]

As is apparent from the above description, the present invention is
A method for preventing the road surface from freezing near the tunnel entrance, in which a group of snow melting pipes consisting of a large number of buried snow melting pipes is installed below the road surface near the tunnel entrance, and the tunnel is installed on the wall surface inside the tunnel. A large number of holes are bored at intervals in the longitudinal direction of the mine, and a pipe for absorbing geothermal heat is inserted into each of the holes to install a group of pipes for absorbing geothermal heat on the wall surface in the tunnel mine, and water is pipe for absorbing the geothermal heat. After being circulated through the group, it is circulated through the snow melting pipe group, and thus water is circulated between the geothermal absorption pipe group and the snow melting pipe group. Therefore, it becomes possible to prevent freezing of the road surface near the tunnel entrance by using geothermal heat at low cost.

[Brief description of drawings]

FIG. 1 (A) is a schematic plan view of a tunnel and a road portion to which the method of the present invention is applied, and FIG. 1 (B) is a side view thereof.

FIG. 2 is a schematic front view of a tunnel and a road portion to which the method of the present invention is applied.

FIG. 3 is a plan view showing a relationship between a snow melting pipe group and a geothermal absorption pipe group.

FIG. 4 is an enlarged cross-sectional view of a geothermal absorption pipe portion.

5 is a view on arrow A in FIG. 4. FIG.

[Explanation of symbols]

 1 Road 3 Road surface 5 Tunnel 7 Wellhead 11,13 Snowmelt pipe group 15,17 Geothermal absorption pipe group 51,53 Pipeline

Claims (2)

[Claims] 1. A method for preventing freezing of a road surface near a tunnel wellhead, wherein a snowmelt pipe group consisting of a large number of buried snowmelt pipes is installed below the roadway near the tunnel wellhead, On the wall surface, a large number of holes are bored at intervals in the longitudinal direction inside the tunnel pit, and a pipe for geothermal absorption is inserted into each hole to install a group of pipes for geothermal absorption on the wall surface inside the tunnel pit, After being circulated to the geothermal absorption pipe group, circulated to the snow melting pipe group, in this way water is circulated between the geothermal absorption pipe group and the snow melting pipe group, A method for preventing freezing of the road surface near the tunnel entrance. 2. A plurality of the snow melting pipe groups are provided side by side in the longitudinal direction of the road surface, and a plurality of the geothermal absorption pipe groups are provided on the wall surface in the tunnel pit corresponding to the number of the snow melting pipe groups. The method for preventing freezing of a road surface in the vicinity of a tunnel wellhead according to claim 1, wherein water is individually circulated between the group of pipes for heat absorption and the group of heat absorption pipes corresponding thereto.