JP3561849B2 - Road surface freezing prevention method near tunnel entrance - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a method for preventing freezing of a road surface near a tunnel entrance.
[0002]
[Prior art]
In cold regions, in order to prevent the road surface from freezing, for example, an electric heating cable system in which a heating cable is buried on the road surface, a hot water circulation cheek system in which a pipe is buried in the road surface and hot water heated by a heat source facility is circulated through this pipe, Various systems have been provided, such as a watering system for spraying water on a road surface.
[0003]
[Problems to be solved by the invention]
However, in the electric heating cable system, a substation facility for supplying electricity to the heating cable must be installed, and electric power is required at the time of operation.
In addition, in the hot water circulation cheek method, a heat source facility for heating water must be installed, and operating costs are incurred because fuel such as oil is burned during operation. There is.
In the watering method, since water is simply sprayed, the cost can be reduced, but there is a problem that the road surface freezes when the temperature is low.
[0004]
On the other hand, the underground temperature is substantially constant throughout the year, and even when the road surface is frozen, the underground temperature is maintained at, for example, about 14 to 15 ° C.
The tunnel is originally excavated in the ground, and the above-mentioned temperature in the ground, that is, geothermal, is easily taken out of the tunnel.
The present invention has been devised with a focus on the geothermal heat and the tunnel, and an object of the present invention is to prevent the freezing of the road surface near the tunnel entrance at a low cost by using the geothermal energy in the vicinity of the tunnel entrance. An object of the present invention is to provide a method for preventing freezing of a road surface.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is a method for preventing freezing of a road surface near a tunnel entrance, and installing a group of snow melting pipes composed of a large number of buried snow melting pipes below the road surface near the tunnel entrance. Then, on the wall surface of the tunnel pit, a number of holes are drilled at intervals in the longitudinal direction of the tunnel pit, and a geothermal absorption pipe group is inserted into each of the holes, and a group of geothermal absorption pipes is formed on the wall surface of the tunnel pit. Installed, the geothermal absorption pipe group and the snow melting pipe group are connected via a pipeline, and a pump is provided in the pipeline, and the geothermal absorption pipe group and the snow melting pipe are provided by the pump. Water is circulated between the pipe group.
Further, in the present invention, a plurality of the pipes for snow melting are provided side by side in the longitudinal direction of the road surface, and a plurality of the pipe groups for geothermal absorption are provided on a wall surface in the tunnel pit corresponding to the number of the pipe groups for snow melting. Water is individually circulated between a group of pipes for melting snow and a group of pipes for heat absorption corresponding to each area.
[0006]
[Action]
Water heated by the geothermal heat is circulated below the road surface, thereby heating the road surface and preventing freezing.
[0007]
【Example】
Hereinafter, the method according to the present invention will be described with reference to the accompanying drawings.
1A is a schematic plan view of a tunnel and a road to which the method of the present invention is applied, FIG. 1B is a side view of the same, FIG. 2 is a front view of the same, and FIG. 3 is a plan view of a piping system.
1 is a road, 3 is a road surface, 5 is a tunnel, 7 is a tunnel entrance, and below the road surface 3 near the tunnel entrance 7, two snowmelting pipe groups 11, 13 are buried side by side in the longitudinal direction of the road 1, In addition, geothermal absorption pipe groups 15 and 17 are embedded in both left and right wall surfaces 5A and 5B in the tunnel 5, respectively.
[0008]
As shown in FIG. 3, each of the snow melting pipe groups 11 and 13 has a large number of snow melting pipes 21 extending in the width direction of the road surface 3 buried under the road surface 3 at intervals in the longitudinal direction of the road 1. When water is supplied to the snow melting pipe 21A located at one end of the road 1 in the longitudinal direction, the water sequentially circulates through the adjacent snow melting pipe 21 and is located at the other end of the road 1 in the longitudinal direction. Both ends of each snow melting pipe 21 are connected to ends of the adjacent snow melting pipe 21 so as to reach the snow melting pipe 21B.
The above-mentioned heat absorbing pipe groups 15 and 17 are composed of a large number of geothermal absorbing pipes which are buried on the wall surfaces 5A and 5B of the tunnel 5 at intervals vertically and at intervals in the longitudinal direction of the tunnel 5. 23.
When burying the geothermal absorption pipe 23, as shown in FIG. 4, holes 24 are drilled laterally in the wall surfaces 5A and 5B in the tunnel 5 using a drill used in tunnel construction. This is performed by inserting a geothermal absorption pipe 23.
The geothermal absorption pipe 23 includes a cylindrical body 25 having a predetermined length, a bottom 27 at the distal end, and a disk-shaped lid 29 attached to an opening at the base end. 29 has two holes 31 and 33 formed therein.
The 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 5 </ b> A and 5 </ b> B of the tunnel 5.
[0010]
A pipe 35 is inserted from one hole 31 of the lid 29 into the geothermal absorption pipe 23 in a liquid-tight manner, and a distal end opening 3501 of the pipe 35 faces the bottom 27 and a pipe portion exposed from the lid 29. The reference numeral 3503 is formed in a curved shape, and has a connection flange 37 attached to the end thereof as shown in FIG.
A pipe 41 curved in a direction opposite to the pipe portion 3503 protrudes from the other hole 33 of the lid portion 29, and a connecting flange 43 is attached to a tip of the pipe 41.
The pipe 41 is connected to the pipe 35 of the adjacent geothermal absorption pipe 23 in the horizontal direction via the flange 43, the connecting pipe 45, and the flange 37, and thus the space between the adjacent geothermal absorption pipes 23 is provided. , The pipe 41, the flange 43, the connecting pipe 45, the flange 37, and the pipe 35 are interconnected. As shown in FIG. 3, after the water circulates through the lower pipe row 23A, the upper pipe row 23B Heat absorbing pipe groups 15 and 17 are configured to circulate.
[0011]
The two snow melting pipe groups 11 and 13 and the two geothermal absorption pipe groups 15 and 17 are individually connected as shown in FIG.
In the embodiment, a group of snow melting pipes 11 buried in a portion of the road surface 3 facing the inside of the tunnel 5 and a group of pipes 15 for geothermal absorption buried in the left wall surface 5A of the tunnel 5 are connected via a conduit 51. The group 13 of snow melting pipes buried in the road surface 3 away from the inside of the tunnel 5 and the group 17 of geothermal absorption buried in the right wall 5B of the tunnel 5 are connected via a pipe 53. ing.
More specifically, the water circulating in the upper pipe row 23B of the heat absorbing pipe groups 15 and 17 is located at the end of each of the snow melting pipe groups 11 and 13 away from the tunnel 5. The water circulated through the snow-melting pipes 21B located on the tunnel 5 side of the snow-melting pipe groups 11, 13 is supplied to the pipe row 23A below the heat-absorbing pipe groups 15, 17, respectively. Are connected by pipes 51 and 53, and a pump P is interposed in each of the pipes 51 and 53.
[0012]
According to the present embodiment, after the pump P is driven, water circulates through the lower pipe row 23A and the upper pipe row 23B of the heat absorbing pipe groups 15 and 17 and then the respective snow melting pipe groups 11 and 13. After being circulated through the snow melting pipe groups 11 and 13, it is circulated through the heat absorbing pipe groups 15 and 17, and such circulation is repeated.
Then, when circulating through the heat absorbing pipe groups 15 and 17 at various places, water flows out from the tip opening 3501 of the pipe 35 to the bottom 27 of the geothermal absorbing pipe 23, passes through the body 25, and connects the pipe 41 and the connecting pipe 45. From the pipe 35 to the bottom 27 of the adjacent geothermal absorption pipe 23, circulates in this way to the adjacent geothermal absorption pipe 23, and passes through the body 25 of the heat absorption pipe 23 in each place. In doing so, heat exchange is performed between the ground and the ground, whereby the ground heat is conducted to the water, and the water is heated to about 14 to 15 ° C.
The heated water is supplied to each of the snow-melting pipe groups 11 and 13 via the pipes 51 and 53, and the heated water circulates through the snow-melting pipe groups 11 and 13 so that the road surface 3 is heated. Is heated to prevent freezing.
[0013]
According to the road surface freezing prevention method according to the present embodiment, the water is heated using geothermal heat, and the water is simply circulated by the pump P to heat the road surface 3, so that the road surface 3 is prevented from freezing. In this case, the operation cost is extremely low, and the maintenance and inspection are easily performed.
Further, when installing the pipe groups 15 and 17 for geothermal absorption, holes are made in the tunnel walls 5A and 5B in the lateral direction using a drill used in the construction of the tunnel 5, and the pipes for geothermal absorption are formed in the tunnel walls 5A and 5B. 23 can be buried, so that it can be easily installed without preparing any special device or equipment, and cost can be reduced.
[0014]
【The invention's effect】
As is apparent from the above description, the present invention is a method for preventing freezing of a road surface near a tunnel entrance, and a group of snow melting pipes including a large number of embedded snow melting pipes below the road surface near the tunnel entrance. Is installed, on the wall surface of the tunnel pit, a number of holes are drilled at intervals in the longitudinal direction of the tunnel pit, and a geothermal absorption pipe group is inserted into each of the holes to form a group of geothermal absorption pipes in the tunnel pit. Installed on a wall surface, the geothermal absorption pipe group and the snow melting pipe group are connected via a pipeline, and a pump is provided in the pipeline, and the geothermal absorption pipe group and the Water was circulated between the group of pipes for melting snow.
Therefore, it is possible to prevent the road surface near the tunnel entrance from freezing at low cost by using geothermal energy.
[Brief description of the drawings]
FIG. 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.
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 group of pipes for snow melting and a group of pipes for geothermal absorption.
FIG. 4 is an enlarged sectional view of a geothermal absorption pipe portion.
FIG. 5 is a view taken in the direction of arrow A in FIG. 4;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Road 3 Road surface 5 Tunnel 7 Wellhead 11,13 Snow melting pipe group 15,17 Geothermal absorption pipe group 51,53 Pipe line

Claims (2)

A method for preventing freezing of a road surface near a tunnel entrance,
Below the road surface near the tunnel entrance, a group of snow melting pipes consisting of a large number of buried snow melting pipes was installed,
In the wall surface of the tunnel pit, a number of holes are drilled at intervals in the longitudinal direction of the tunnel pit,
Insert the geothermal absorption pipes into the respective holes and install the geothermal absorption pipes on the wall surface inside the tunnel pit,
While connecting the geothermal absorption pipe group and the snow melting pipe group via a pipe, a pump is provided in the pipe,
By the pump , water was circulated between the geothermal absorption pipe group and the snow melting pipe group,
A method for preventing freezing of a road surface near a tunnel entrance. A plurality of the 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 the pipe groups for snow melting. 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 each group of heat absorption pipes corresponding to (1).

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