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

Abstract

To provide a bridge road surface freeze suppression equipment bridge capable of suppressing road surface from freezing.SOLUTION: A road surface freeze suppression equipment 30 of bridge 10 has a partition 32 that partitions an under space US under a floor slab 16 in the bridge 10 in a height direction. The partition 32 may use a flexible sheet for example. The partition 32 is arranged to partition the under space US to be suspended from the floor slab 16, a main girder 14, or a cross girder 18 that support the floor slab 16.SELECTED DRAWING: Figure 2

Description

Technical Field

[0007] , ,

[0006] , , ,

[0005] , , , ,

[0001] This invention relates to a road surface freezing suppression facility for bridges and a method for suppressing road surface freezing of bridges.

Background Art

[0002] The road surface of a bridge is more likely to freeze in winter than the road on the ground. To suppress the freezing of the road surface, for example, as described in Patent Document 1, it has been proposed to attach a planar heater to the lower surface of the floor slab with an adhesive and heat the floor slab with the planar heater.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Patent Document 1 requires power to energize the planar heater and cannot be applied to bridges where no electric wires are laid, such as in mountainous areas.

[0005] In view of the above problems in the prior art, the present invention is proposed to preferably solve these problems, and an object thereof is to provide a road surface freezing suppression facility and a road surface freezing suppression method for bridges that can reduce or eliminate artificial energy such as electric power and power.

Means for Solving the Problems

[0006] To overcome the above problems and achieve the intended purpose, the road surface freezing suppression facility for bridges according to the present invention is characterized in that it has a partition that divides the lower space of the floor slab in the bridge in the height direction. <00,00036> In order to overcome the aforementioned problems and achieve the intended objective, the method for suppressing road surface freezing of bridges according to the present invention is: The gist of this is to partition the space below the deck of the bridge in the height direction by installing a partition in the bridge. [Effects of the Invention]

[0008] According to the bridge road surface freezing suppression equipment of the present invention, road surface freezing can be suppressed by effectively utilizing natural energy. According to the bridge road surface freezing suppression method of the present invention, road surface freezing can be suppressed by effectively utilizing natural energy. [Brief explanation of the drawing]

[0009] [Figure 1] This is a schematic diagram showing a bridge equipped with road surface freezing prevention equipment according to an embodiment of the present invention, viewed from the side. [Figure 2] This is a schematic cross-sectional view showing a bridge equipped with road surface freezing prevention equipment according to the embodiment. [Figure 3] This is a schematic perspective view showing a portion of a bridge equipped with road surface freezing prevention equipment as described in the example. [Figure 4] This is a schematic perspective view showing a portion of a bridge equipped with road surface freezing prevention equipment as an example of the modifications. [Modes for carrying out the invention]

[0010] Next, preferred embodiments of the bridge road surface freezing prevention equipment and bridge road surface freezing prevention method according to the present invention will be described below with reference to the attached drawings. In the following description, the direction in which the road width of a bridge is defined 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. [Examples]

[0011] The bridge 10 shown in Figure 1 exemplifies a reinforced concrete (RC) slab bridge spanning a river R flowing through a mountain valley. The bridge 10 has a deck slab 16 built on main girders 14 supported by bridge piers 12 (which may also be abutments) rising from the ground (see Figures 1 to 3). The main girders 14 are arranged in parallel and spaced apart laterally on the bridge 10. Cross girders 18 are also provided extending laterally between adjacent main girders 14, 14. The main girders 14 and cross girders 18 can be made of concrete or steel, but in this embodiment, H-shaped steel is used as an example. A road surface 20 made of asphalt or the like is provided on the upper surface of the deck slab 16. In addition, fall prevention means such as side walls or railings 22 (in this embodiment) are provided on the side edges of the deck slab 16.

[0012] As shown in Figures 1 to 3, the road surface freezing prevention equipment 30 of the embodiment has a partition 32 that divides the space US below the deck slab 16 in the height direction. The partition 32 may extend vertically as in the embodiment, or it may extend diagonally, and it is sufficient that it is arranged to have a component that extends in the height direction (up and down direction). The partition 32 may be attached to any part of the bridge components that make up the bridge 10, such as the bridge piers 12 (abutments), main girders 14, cross girders 18, and deck slab 16. Furthermore, the partition 32 can be arranged to extend along the side edge of the deck slab 16 or the extension direction of the main girders 14, or to extend along the lateral direction of the deck slab 16 or the extension direction of the cross girders 18. The partition 32 may be attached to the bridge structure by being suspended from the bridge structure or spanned between the bridge structure, or it may be integrally formed with the bridge structure by providing a shape that extends downward from the deck slab 16 or girders 14, 18, etc. It is preferable that the partition 32 is separate from the bridge structure because the road surface freezing prevention equipment 30 can be easily applied to the existing bridge 10. The partition 32 can be attached by clips or strings, or by joining with adhesive, and it is desirable from a management standpoint to attach the partition 32 so that it can be removed.

[0013] As shown in Figures 2 and 3, in the embodiment, partitions 32 are attached to the railing 22, and partitions 32 suspended from the floor slab 16 are positioned along the side edge of the floor slab 16. In the embodiment, partitions 32 are also attached to the transverse beam 18, and partitions 32 suspended from the transverse beam 18 and partitions 32 suspended from the side edge of the floor slab 16 surround all four sides of the lower space US. By positioning the partitions 32 along the side edge of the floor slab 16 in this way, the lower space US of the floor slab 16 can be largely divided in the lateral direction, allowing the heat from the ground to act widely in the left-right direction of the floor slab 16. For example, when attaching partitions 32 to the main beam 14, it is preferable to attach them to the main beam 14 located on the lateral outer side rather than the main beam 14 located on the lateral inner side. Furthermore, by suspending the partitions 32 from a structure above the floor slab 16, such as the railing 22, the partitions 32 can be attached and removed from above the floor slab 16, resulting in good workability. Furthermore, in the summer or when there are strong winds, the partition 32 can be easily lifted onto the floor slab 16, and if the partition 32 is a flexible sheet, it can be rolled up or folded to make it compact.

[0014] The partition 32 alone, or in combination with bridge components such as the main girders 14 and cross girders 18 located below the deck slab 16, should reduce or eliminate the gaps that open laterally in the space US below the deck slab 16. As shown in the embodiment, the sides of the space US below the deck slab 16 can be closed by suspending the partition 32 from the side edge of the deck slab 16. For example, when the partition 32 is attached to girders such as the main girders 14 and cross girders 18, the sides of the space US below the deck slab can be closed by the girders 14 (18) that are connected in the height direction and the partition 32.

[0015] The road surface freezing prevention equipment 30 has four sides of the space US under the deck slab 16 enclosed by partitions 32, 32 arranged opposite each other in the horizontal direction and partitions 32, 32 arranged opposite each other in the longitudinal direction. By enclosing the space US under the deck slab 16 with partitions 32 in this way, it is possible to make it more difficult for heat from the ground to escape from the space US under the deck slab. In addition, the effect of preventing heat from escaping from the ground will be achieved if at least one horizontal side of the space US under the deck slab 16 is partitioned by partitions 32.

[0016] The partition 32 is positioned to at least demarcate the side of the lower space US closest to the floor slab 16. That is, the lower side of the partition 32 may be positioned so that it does not come into contact with the ground or river R, leaving a gap below it, or the lower side of the partition 32 may be positioned so that it comes into contact with the ground or river R, dividing the lower space US over its entire height. In this way, the lower space US of the floor slab 16 is demarcated on the sides by the partition 32, but the lower side facing the ground or river R is open.

[0017] In the case of a bridge 10 spanning over a flowing body of water such as a river R, as shown in Figure 1, the partition 32 may be positioned so as to be in contact with the flowing water. Even at low temperatures below 0°C, the temperature of the flowing water is higher than the air temperature. By preventing the heat from the river R flowing beneath the deck 16 from escaping through the space US beneath the deck 16 via the partition 32, the heat from the water flow can be effectively utilized in addition to the heat from the ground, thereby suppressing the freezing of the road surface 20.

[0018] The partition 32 can be made of synthetic resin such as vinyl chloride, rubber, metal such as steel or aluminum, etc. Also, the partition 32 can be made of a panel having a certain shape retention property, a sheet thinner than a plate material, etc. Note that if the partition 32 is a flexible sheet, it is preferable because it is relatively lightweight and inexpensive, and the workability of attaching and detaching it to the bridge 10 is good. Also, the partition 32 preferably has light transmissibility, and if it is a transparent or translucent partition 32, it is good because it can hardly prevent sunlight from reaching the ground during the day. An example of such a partition 32 is a vinyl curtain.

[0019] As shown in FIGS. 2 and 3, the partition 32 may have a holding means 34 for pulling it downward. Examples of the holding means 34 include using a weight such as a chain made of metal, or pulling it from the ground or the like by a rope or an anchor. Note that the holding means 34 in the embodiment is a chain suspended below the partition 32. By pulling the partition 32 downward in this way, it is possible to suppress the partition 32 from swaying due to wind, stabilize the partition 32, and make it more difficult for the heat from the ground to escape from the lower space US of the floor slab 16.

[0020] The reason why the road surface 20 of the bridge 10 is likely to freeze is not that the lower surface of the floor slab 16 is cooled from below by wind or the like, but rather that the heat capacity of the floor slab 16 is small, so even when sunlight hits the road surface 20 during the day, the heat during the day cannot be accumulated in the floor slab 16 until night. On the other hand, since the ground has a larger heat capacity than the floor slab 16, the temperature of the ground is more likely to be kept higher than that of the floor slab 16 even at night. According to the road surface freezing suppression facility 30, by partitioning the lower space US of the floor slab 16 in the height direction by the partition 32 provided on the bridge 10, it is possible to make it difficult for the air kept relatively warm by the heat of the ground to escape from the lower space US of the floor slab 16. And by retaining relatively warm air in the lower space US of the floor slab 16, it becomes difficult for the temperature of the floor slab 16 to decrease, and the freezing of the road surface 20 can be suppressed. Also, it is possible to make it difficult for snow to accumulate on the road surface 20. Thus, since the road surface freezing suppression facility 30 effectively utilizes the natural energy of the heat of the ground, it is environmentally friendly and can reduce or eliminate artificial energy such as electricity and power. Therefore, the road surface freezing suppression facility 30 can also be applied to the bridge 10 installed in mountainous areas where there is no electricity. Also, the use of freezing inhibitors such as calcium chloride can be reduced or eliminated, making management easy and reducing management costs.

[0021] The road surface freezing suppression facility 30 is a simple one that only requires the installation of the partition 32. So, for example, when applying it to an existing bridge 10, it is possible to perform construction manually without using large construction machinery or installing temporary structures such as large scaffolds, and it is possible to take freezing suppression measures with inexpensive construction. Also, even when the partition 32 is provided, there is an advantage that the weight load on the bridge 10 is small.

[0022] (Modified Example) Not limited to the above-described matters, for example, it may be as follows. Note that the present invention is not limited only to the specific descriptions of the embodiments and the following modified examples. (1) Not limited to the RC floor slab cited in the embodiment, the road surface freezing suppression facility and the road surface freezing suppression method described above can be applied to steel floor slabs, composite floor slabs, and floor slabs with other structures. (2) The road surface freezing prevention equipment may be installed to cover the entire deck or to cover only a portion of the deck. (3) As shown in Figure 4, in addition to the partition 32 described above, a water channel 36 may be provided on the underside of the deck slab 16 through which water introduced from around the bridge 10 can flow. By flowing water through the water channel 36, which consists of pipes or the like, the temperature drop in the space US under the deck slab 16 can be suppressed by the heat of the water flow, thereby preventing the road surface 20 from freezing. (4) As shown in Figure 4, in addition to the partition 32 extending in the height direction as described above, a lower partition 38 may be provided below the floor slab 16, spaced apart from the floor slab 16. The lower partition 38 can be placed, for example, between the main girders 14 and the cross girders 18. The presence of the lower partition 38 allows heat from sunlight hitting the road surface 20 during the day to accumulate between the floor slab 16 and the lower partition 38, and this heat, along with the heat from the ground, can suppress the freezing of the road surface 20. By making the lower partition 38 an insulating panel such as urethane, it is possible to make it difficult for the heat accumulated during the day to escape. By making the lower partition 38 a metal panel with good thermal conductivity such as aluminum, it is possible to make it easier for heat from the ground to pass through. [Explanation of symbols]

[0023] 10 bridges, 16 deck slabs, 32 partitions, 34 retaining means, US lower space

Claims

1. The bridge has a partition that divides the space beneath the deck slab over the entire height. A bridge road surface freezing prevention device characterized by the following features.

2. The bridge has a partition that divides the space below the deck slab, which is open to the lower side, in the height direction. The lower space is enclosed by the partitions arranged opposite each other in the lateral direction of the floor slab and the partitions arranged opposite each other in the longitudinal direction of the floor slab. A bridge road surface freezing prevention device characterized by the following features.

3. The bridge has a partition that divides the space beneath the deck slab in the height direction, with the ground side being open and the deck slab and the ground directly facing each other through the space beneath. A bridge road surface freezing prevention device characterized by the following features.

4. The bridge has a partition that divides the space below the deck slab, which is open to the lower side, in the height direction. The partition is made of a flexible vinyl curtain. A bridge road surface freezing prevention device characterized by the following features.

5. A partition that divides the space beneath the deck slab of a bridge in the vertical direction, It has a holding means for pulling the partition downwards, The holding means is a rope or a metal weight. A bridge road surface freezing prevention device characterized by the following features.

6. The partition installed in the bridge divides the space beneath the bridge deck over the entire height. A method for suppressing road surface freezing on bridges, characterized by the features described above.

7. In a bridge, partitions positioned opposite each other in the lateral direction of the deck slab and partitions positioned opposite each other in the longitudinal direction of the deck slab divide the lower space that is open to the lower side of the deck slab in the height direction. A method for suppressing road surface freezing on bridges, characterized by the features described above.

8. A partition installed in the bridge divides the space beneath the bridge deck in the height direction, with the ground side being open and the deck and the ground directly facing each other through the space beneath. A method for suppressing road surface freezing on bridges, characterized by the features described above.

9. By installing a partition in the bridge, the lower space that is open to the underside of the bridge deck is partitioned in the height direction. The partition is made of a flexible vinyl curtain. A method for suppressing road surface freezing on bridges, characterized by the features described above.

10. By installing a partition in the bridge, the space below the deck of the bridge is divided in the height direction. The partition has a holding means for pulling it downwards, The holding means is a rope or a metal weight. A method for suppressing road surface freezing on bridges, characterized by the features described above.

Images