JPH064110U - Bridge steel deck structure - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the thermal conductivity inside the pavement and prevent the pavement surface from freezing. [Structure] The pavement aggregate 14 is mixed with an aluminum chip 15 to form a pavement material 16. The asphalt pavement 7 is constructed by applying the pavement material 16 on the upper surface of the steel deck 5. The thermal conductivity inside the asphalt pavement 7 is improved by the aluminum chip 15 to prevent only the surface portion from being overcooled.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a steel deck slab structure in a bridge using a steel deck.

[0002]

[Prior art]

 A bridge using a steel deck is, as an example shown in FIG. 2, fixing a main girder 4 via a bearing 3 on the upper surface of a bridge pier 2 erected on the ground 1, and on the main girder 4. A steel plate slab 5 constructed by a large long plate-shaped steel deck slab 6 and vertical ribs 8 in the bridge axis direction and lateral ribs 9 in the bridge width direction that reinforce the deck plate 6 on the lower surface side is erected. In addition, the steel floor slab 5 is provided with an asphalt pavement 7.

In the above bridge, since the steel deck 5 is exposed to the outside air and has a small heat capacity, freezing due to a radiation cooling phenomenon is likely to occur as compared with general pavement on the ground. There is.

That is, since the above-mentioned asphalt pavement 7 has a poor thermal conductivity, if a radiative cooling phenomenon occurs especially on a clear night in winter, for example, as shown in FIG. The surface portion has a temperature distribution such that it becomes -8 ° C when it is rapidly cooled, and there is a difference in temperature from general pavement on the ground surface, causing freezing. When such freezing occurs, the vehicle is apt to have a slip accident and the like, so it is necessary to prevent the freezing.

Therefore, various types of steel deck slab freeze prevention measures have been conventionally taken. As an example of a steel deck slab anti-icing device that has recently been proposed, as shown in FIG. 4, in a bridge similar to that shown in FIG. 2, a large number of stud bolts 10 are faced downward on the lower surface of the steel deck slab. Each ring-shaped heater is fixed by welding, and the ring-shaped heater 11 is inserted into each stud bolt 10 and tightened with a nut 13 via a washer 12 to be fixed to the lower surface of the steel deck slab plate 6. By heating the steel deck slab deck plate 6 by heating the steel deck slab deck 6 by heating the steel deck slab deck 6 with the heat distribution effect, the surface temperature of the asphalt pavement 7 provided on the upper surface is raised. Some have been raised to prevent the occurrence of freezing (Japanese Patent Application No. 1-72568).

[0006]

[Problems to be solved by the device]

 However, in the case of the steel deck slab anti-freezing method proposed recently, the high thermal conductivity of the steel deck s deck plate 6 is used to cope with the freezing of the pavement surface of the steel deck slab 5, Since a large number of ring-shaped heaters 11 must be installed in the bridge axis direction and the bridge width direction, there is a problem that a large amount of electric energy is required, and maintenance and management are difficult.

Therefore, the present invention is to provide a bridge steel floor slab structure capable of preventing freezing of the pavement surface portion without using electric energy.

[0008]

[Means for Solving the Problems]

 SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a pavement material obtained by appropriately mixing asphalt with aluminum chips having the same size as that of the pavement aggregate and bonding them with asphalt. It will be constructed on the slab to make asphalt pavement.

[0009]

[Action]

 When aluminum chips are mixed with the asphalt pavement on the steel deck slab, the thermal conductivity of the aluminum chips improves the thermal conductivity inside the pavement. As a result, only the surface of the pavement applied to the upper surface of the steel deck will not be rapidly cooled by the radiative cooling phenomenon, and freezing of the pavement surface will be prevented.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. As with the bridge shown in FIG. 2, in the configuration in which the asphalt pavement 7 is constructed on the steel deck slab 5, the asphalt pavement 7 is The pavement aggregate 14 is formed by using a pavement aggregate 16 in which an aluminum chip 15 having a size similar to that of the aggregate 14 (for example, 10 × 20 mm) is appropriately mixed and bonded by asphalt. The above-mentioned aluminum chips 15 enable the thermal conductivity in the upward and downward directions in the asphalt pavement 7 to be enhanced.

In the present invention, since the aluminum chip 15 is contained in the asphalt pavement 7, the thermal conductivity of the aluminum chip 15 itself can significantly increase the thermal conductivity of the entire asphalt pavement 7. In other words, as shown in FIG. 3, the conventional asphalt pavement 7 has a poor heat conductivity, so that the surface portion of the asphalt pavement 7 has a relatively high temperature even though the temperature of the lower layer is relatively high. Although it has been rapidly cooled by radiative cooling, in the case of the present invention, the heat of the lower layer is efficiently transmitted to the surface due to the presence of the aluminum chip 15, so that even if radiative cooling occurs, for example, the temperature distribution shown in FIG. As shown in, the lower layer portion can be kept at + 1 ° C and the surface portion can be kept at about -4 ° C, and the rapid cooling of the surface portion can be eliminated to prevent freezing.

In the above description, since the aluminum chip 15 is about the same size as the pavement aggregate 14, the pavement work is not hindered, and the normal pavement work can be performed.

The present invention is not limited to the above-mentioned embodiment, and for example, aluminum chips may be put only in the surface layer portion of the pavement surface, and within the scope not departing from the gist of the present invention. Of course, various changes can be made.

[0015]

[Effect of device]

 As described above, according to the bridge steel deck slab structure of the present invention, the asphalt pavement is constructed by mixing the aluminum chips having the same size as the pavement aggregate. It is possible to perform work to prevent freezing without significantly modifying it, and improve the thermal conductivity inside the pavement by the heat conduction of the aluminum chips, and only the surface of the pavement is overcooled by the radiation cooling phenomenon. It is possible to prevent the freezing of the pavement surface without the need for electric energy as in the conventional heater system, and it is easy to maintain and manage. Exert.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of a bridge steel deck slab structure of the present invention.

FIG. 2 is a schematic diagram showing an example of a bridge using a steel deck.

FIG. 3 is a partial enlarged view of FIG. 2, showing a temperature distribution of asphalt pavement by radiative cooling.

FIG. 4 is a schematic view showing an example of a conventional steel deck slab freeze prevention device.

[Explanation of symbols]

 5 Steel floor slab 7 Asphalt pavement 14 Pavement aggregate 15 Aluminum chips

Claims (1)

[Scope of utility model registration request] 1. In a bridge steel deck slab structure in which asphalt pavement is constructed on a steel deck, an aluminum chip having a size similar to that of the pavement aggregate is appropriately mixed and contained in the asphalt pavement. Bridge steel deck slab structure characterized by: