Bridge road surface freezing prevention equipment and road surface freezing prevention method

Abstract

To provide a bridge road surface freeze suppression equipment capable of suppressing road surface from freezing.SOLUTION: A road surface freeze suppression equipment 30 of bridge 10 has a running waterway 32 provided below a floor slab 16 in the bridge 10 capable of allowing to flow water which is introduced from a water source WR such as a spring near the bridge 10. The running waterway 32 may be composed of pipes placed on partition 34 that spans between main girders 14 and 14 for example and is arranged so that a slope of the pipe allows the water to flow.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a bridge road surface freezing prevention system and a bridge road surface freezing prevention method. [Background technology]

[0002] Bridge road surfaces are more susceptible to freezing in winter than roads on the ground. To prevent road surface freezing, it has been proposed to attach a sheet heater to the underside of the deck with an adhesive and heat the deck, as in Patent Document 1, for example. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 6-1416 Summary of the Invention [Problem to be solved by the invention]

[0004] The technology disclosed in Patent Document 1 requires electricity to energize the sheet heater, and therefore cannot be applied to bridges in mountainous areas where no electric wires are laid.

[0005] The present invention has been proposed in consideration of the above-mentioned problems associated with the conventional technology in order to solve them in an optimal manner, and aims to provide bridge road surface anti-freezing equipment and a road surface anti-freezing method that can reduce or eliminate the need for artificial energy such as electricity and power. [Means for solving the problem]

[0006] In order to overcome the above problems and achieve the intended purpose, the bridge road surface anti-freezing equipment according to the present invention comprises: A waterway is installed under the deck of the bridge to allow water to flow in from the surrounding area. The gist of this is as follows.

[0007] In order to overcome the above problems and achieve the intended purpose, the method for suppressing freezing of bridge road surfaces according to the present invention comprises: The gist of this method is to introduce water from around the bridge and have it flow into a waterway installed under the deck of the bridge. [Effects of the Invention]

[0008] According to the bridge road surface anti-freezing equipment of the present invention, natural energy can be effectively utilized to prevent the road surface from freezing. According to the method for suppressing freezing of bridge road surfaces of the present invention, natural energy can be effectively utilized to suppress freezing of road surfaces. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a schematic diagram showing a bridge equipped with road surface anti-freezing equipment according to an embodiment of the present invention, viewed from the side. [Figure 2] 1 is a cross-sectional view schematically showing a bridge equipped with road surface anti-freezing equipment according to an embodiment of the present invention. [Figure 3] 1 is a perspective view showing a part of a bridge equipped with road surface anti-freezing equipment according to an embodiment of the present invention; [Figure 4] FIG. 2 is an explanatory diagram showing the flow of water in the road surface anti-freezing equipment of the embodiment. [Figure 5] FIG. 10 is a schematic perspective view showing a part of a bridge equipped with a modified example of road surface anti-freezing equipment. DETAILED DESCRIPTION OF THE INVENTION

[0010] Next, a preferred embodiment of a bridge road surface freezing prevention system and a bridge road surface freezing prevention method according to the present invention will be described below with reference to the accompanying drawings. In the following description, the direction of the road width on a bridge will be referred to as the lateral direction, and the direction in which the road extends on a bridge will be referred to as the longitudinal direction. [Example]

[0011] The bridge 10 shown in FIG. 1 is an example of an RC (reinforced concrete) deck bridge spanning a river R flowing through a mountain valley. The bridge 10 includes a deck 16 provided on main girders 14 supported by piers 12 (which may be abutments) rising from the ground (see FIGS. 1 to 3). The main girders 14 are arranged in parallel and spaced apart laterally across the bridge 10. Cross girders 18 are provided extending laterally between adjacent main girders 14. The main girders 14 and cross girders 18 are made of concrete or steel, but in the example, H-shaped steel is used. A road surface 20 made of asphalt or the like is provided on the upper surface of the deck 16. Fall prevention measures such as side walls and parapets 22 (in the example) are provided on the side edges of the deck 16.

[0012] As shown in FIGS. 2 and 3 , the road surface anti-freezing system 30 of the embodiment has a water channel 32 provided below the deck slab 16. The water channel 32 is configured to allow water to flow through the water channel 32, which is introduced from a water source WR located higher than the deck slab 16 via a water channel WL such as a pipe or a trench (see FIG. 4 ). The water source WR can be naturally occurring water, such as spring water, lakes and ponds such as reservoirs, rivers, or water storage facilities. Water is introduced from the water source WR to the water channel 32 due to the elevation difference between the water source WR and the water channel 32. As shown in the embodiment, the downstream of the water channel 32 is connected to a drainage pipe 24 for discharging water such as rainwater from the road surface, etc., and water that has passed through the water channel 32 can be discharged into the drainage pipe 24. Water may also be discharged from the downstream of the water channel 32 to a river or trench near the bridge 10.

[0013] The waterway 32 can be formed from pipes (as shown in the embodiment) or gutters, or other materials capable of carrying water. The waterway 32 is not particularly limited, but it is preferable to install pipes with diameters of approximately 20 mm to 250 mm, spaced approximately 200 mm to 500 mm apart, since this reduces the weight load on the bridge 10. The waterway 32 may either have a single path for water flow or multiple paths for water distribution. For example, as shown in the embodiment, the pipes may be arranged in a serpentine pattern. The waterway 32 is sloped from its inlet, which connects to the water collection channel WL, to its outlet, which connects to the drainage pipe 24, allowing water to flow naturally. The deck slab 16 is sloped to prevent water from pooling on the road surface 20. By arranging the waterway 32 along the slope of the deck slab 16, the slope of the waterway 32 can be easily maintained.

[0014] As shown in Figures 2 and 3, a partition 34 is provided below the flow channel 32, which is spaced apart from the deck slab 16. The partition 34 separates the space US below the deck slab 16. The partition 34 can be made of a single material, such as synthetic resin, rubber, or metal (e.g., steel or aluminum), or a composite (multi-layer) material primarily made of these materials. The partition 34 may be installed, for example, spanning the main girders 14 or cross girders 18. Lightweight partitions 34 made of polyurethane foam (including polyisocyanurate foam) or aluminum are preferred because they reduce the weight load of the bridge 10. The presence of the partition 34 allows heat from sunlight hitting the road surface during the day to accumulate between the deck slab 16 and the partition 34, preventing the road surface 20 from freezing at night. In particular, using an insulating structure for the partition 34, such as a urethane insulating panel, can help prevent the heat accumulated during the day from escaping. Furthermore, by using a metal panel with good thermal conductivity such as aluminum as the partition 34, it is possible to make it easier for heat from the ground to pass through.

[0015] In this embodiment, the flow channel 32 is placed on the partition 34, which is also used as a support for the flow channel 32. If the flow channel 32 is not installed on the partition 34, the flow channel 32 may be installed by hanging it from the deck slab 16 or by attaching it to a bridge structure below the deck slab 16, such as the main girder 14 or cross girder 18.

[0016] A vertical wall may be provided to separate the deck slab 16 and the partition 34 in the height direction. As shown in Figures 2 and 3, in the embodiment, the main girder 14 supporting the partition 34 separates the deck slab 16 and the partition 34 in the height direction and is used as the vertical wall. The vertical wall preferably has a thermally insulated structure, and in the case of the embodiment, the thermally insulated structure may be achieved by spraying polyurethane foam onto the main girder 14 or by using an insulating board as the vertical wall.

[0017] The reason why the road surface 20 of the bridge 10 is prone to freezing is not because the underside of the deck 16 is cooled from below by wind or other factors, but because the deck 16 has a small thermal capacity, meaning that even if the road surface 20 is exposed to sunlight during the day, heat from the daytime cannot be stored in the deck 16 until nighttime. The road surface anti-freezing system 30 makes it difficult for the deck 16 to cool by utilizing the heat from the water flowing through the water channel 32 installed under the deck 16. This prevents the road surface 20 from freezing. It also makes it difficult for snow to accumulate on the road surface 20. The road surface anti-freezing system 30 is configured to channel water introduced from a water collection source WR located around the bridge 10 into the water channel 32, making it environmentally friendly and reducing or eliminating the need for artificial energy such as electricity and power. Furthermore, utilizing the natural flow of water due to elevation differences makes it environmentally friendly and eliminates the need for artificial energy such as electricity and power. Therefore, the road surface anti-freezing equipment 30 can be applied to bridges 10 installed in mountainous areas where electricity is not available. In addition, the use of anti-freezing agents such as calcium chloride can be reduced or eliminated, making maintenance easier and reducing maintenance costs.

[0018] The road surface anti-freezing equipment 30 is a simple device that simply installs a water channel 32. Therefore, when applied to an existing bridge 10, for example, it can be constructed manually without the need for large heavy machinery or temporary structures such as large-scale scaffolding, making it possible to implement anti-freezing measures through inexpensive construction. Another advantage is that even if a water channel 32 is installed, the weight load on the bridge 10 is small.

[0019] (Example of change) The present invention is not limited to the above-mentioned items, but may be, for example, as follows: Note that the present invention is not limited to the specific descriptions of the examples and the following modified examples. (1) The road surface anti-freezing equipment and road surface anti-freezing method described above can be applied not only to the RC deck slabs mentioned in the examples, but also to steel deck slabs, composite deck slabs, and deck slabs of other structures. (2) Road surface anti-freezing equipment may be installed to cover the entire deck or to cover a partial area of ​​the deck. (3) In the embodiment, the water channel is provided away from the deck slab, but this is not limiting, and the water channel may be provided so as to be in contact with the deck slab. (4) Water may be run over the partition, and the partition may be used as a waterway. (5) As shown in FIG. 5 , in addition to the aforementioned water flow channel 32, a vertical partition 36 may be provided to vertically divide the space US below the deck slab 16 of the bridge 10. The vertical partition 36 may be, for example, a panel or a flexible sheet, and may be suspended from the deck slab 16 or the girder 14. Reference numeral 38 denotes a retaining means for stabilizing the vertical partition 36, and may be, for example, a weight such as a chain. Because the ground has a greater heat capacity than the deck slab 16, areas closer to the ground are warmer than the deck slab 16. By dividing the space US below the deck slab 16 vertically with the vertical partition 36, it is possible to prevent relatively warm air generated by the heat of the ground from escaping from below the deck slab 16. Furthermore, by retaining the relatively warm air in the space US below the deck slab 16, the temperature of the deck slab 16 is less likely to drop, thereby preventing the road surface 20 from freezing. [Explanation of symbols]

[0020] 10 Bridge, 14 Main girder (vertical wall), 16 Deck, 32 Waterway, 34 Divider

Claims

1. a partition disposed below a deck slab in the bridge at a distance from the deck slab to form a space between the deck slab and the partition; a waterway that is placed on the partition at a distance from the deck and that can pass water introduced from around the bridge; Does not have a heat source A bridge road surface anti-freeze equipment characterized by:

2. a partition disposed below a deck slab in the bridge at a distance from the deck slab to form a space between the deck slab and the partition; and a waterway placed on the partition at a distance from the deck, through which water can flow from the surrounding area of ​​the bridge (excluding aluminum alloy decks with snow melting and anti-freezing devices, which are made of aluminum alloy extruded members and have a rectangular wave-shaped cross section consisting of a repeated trapezoidal cross section, and in which heaters are arranged along the length of the rear-side opening grooves that make up the trapezoidal cross section).

3. A method for suppressing freezing of a bridge road surface, using the road surface anti-freezing equipment according to claim 1 or 2.

Images