JP2014202001A - Concrete pavement structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a concrete pavement structure capable of reducing influence in disconnection, and capable of also reducing maximum electric power and electric power consumption.SOLUTION: A heating wire 9 of a concrete pavement slab 4 is wired in parallel. A control device 50 controls ON/OFF of electric power supply by selecting first temperature control of paying attention to the snow melting effect or second temperature control of paying attention to the antifreezing effect, and executes the first temperature control in a snowfall, and executes the second temperature control by completion of snow-melting. A power source device 45 respectively supplies electric power to the respective heating wires 9 based on a command of the control device 50. The concrete pavement slab 4 is composed of an upper layer part 8b of high heat conductivity and a lower layer part 8a of low heat conductivity by sandwiching the heating wire 9. A silicate rock crushed stone is used for a coarse aggregate of the upper layer part 8b, and silicate rock crushed sand is used for a fine aggregate. A steel-making slag is used for the coarse aggregate of the lower layer part 8a, and a steel-making slag (water granulation) is used for the fine aggregate.

Description

  The present invention relates to a concrete pavement structure, and particularly to a concrete pavement plate having a high snow melting effect.

  In a snowfall area, a snow melting device such as a heating wire is embedded in a road or the like to melt snow on the road surface and prevent the road surface from freezing (for example, Patent Document 1).

  In the asphalt pavement that is the mainstream of pavement, asphalt finisher is used to spread and level the asphalt, and further, a heating wire is embedded in a predetermined position of the asphalt layer, and then rolled by a road roller. Considering the workability when embedding the heating wire at the construction site, it is preferable to use the heating wire as a series wiring because the structure is simple.

  By the way, a concrete pavement plate may be used from the viewpoint of durability and rapid construction for pavement of a tunnel exit site, a tunnel entrance site, a road slope site, a toll gate site, and an intersection site. A highly rigid pavement structure is formed by arranging a plurality of concrete pavement plates in a plane and connecting adjacent concrete pavement plates together. To provide a snow melting function, a heating wire is embedded in the concrete pavement. A concrete paving slab may also be used on the sidewalk.

  At this time, it is common to use a heating wire in series as in asphalt pavement. Specifically, a connection portion is provided at the end portion of the concrete pavement plate, and when connecting the concrete pavement plates, the connection portions are electrically connected in series.

JP-A-11-152708

  The series wiring as in the prior art has the following problems.

  Since the concrete pavement plate can be attached and detached, and only the broken concrete pavement plate needs to be replaced, the workability at the time of repair is better than the asphalt pavement where the entire surface is repaired. Still, there is room for improvement in measures against disconnection.

  That is, when the heating wire is partially broken, the influence is exerted on the whole. As a result, all the snow melting functions of the pavement structure are lost. Also, it is unclear which concrete pavement heating wire has been disconnected. The heating wire of all concrete paving plates must be checked for disconnection.

  For example, the amount of snow is not uniform at the entrance and exit of the tunnel. As the distance from the tunnel increases, the amount of snow increases. Also, the location with a lot of snow varies depending on the wind direction and topography of the day. In the series wiring, the part with a large amount of snow and the part with a small amount of snow are heated uniformly. Unnecessary heating results in wasted power consumption and increases maintenance costs.

  This invention solves the said subject, and it aims at providing the concrete pavement structure which can reduce the influence at the time of a disconnection, and can reduce maximum electric power and power consumption.

  The present invention for solving the above-mentioned problems is a pavement structure in which a plurality of floor slabs in which heating wires are embedded in concrete are laid out in a plane, and the heating wires are electrically connected in parallel.

  By arranging the heating wires in parallel, even if one of the heating wires is disconnected, the other heating wires can continue to melt snow, and the disconnection can be easily detected, and the influence at the time of disconnection can be reduced.

  Heating control according to the amount of snow can be performed by heating each floor slab by parallel arrangement of heating wires. Thereby, the maximum power and the power consumption can be reduced.

  Preferably, in the above invention, the pavement structure further includes a power supply device and a control device that controls ON / OFF of power supply from the power supply device to a heating wire of each floor board.

  By turning off the power supply, unnecessary heating can be avoided, and the maximum power and power consumption can be reduced.

  More preferably, the floor slab is connected to a moisture sensor and a temperature sensor, and the control device selects one of the first temperature control and the second temperature control based on information of the moisture sensor. When the first temperature control is selected, the power supply is controlled so that the temperature of the temperature sensor falls within the first target temperature range including the first target reference temperature, and the second temperature control is selected. In this case, the power supply is controlled so that the temperature of the temperature sensor falls within a second target temperature range including a second target reference temperature, and the first target reference temperature is set higher than the second target reference temperature. Yes.

  The first temperature control that expects a snow melting effect is selected during snow accumulation, and the second temperature control that expects a freezing prevention effect upon completion of snow melting is selected. The second temperature control can reduce the power consumption compared to the first temperature control. Thereby, unnecessary heating can be avoided and power consumption can be reduced.

  Preferably, in the above invention, the floor slab includes an upper layer portion having a high thermal conductivity and a lower layer portion having a low thermal conductivity with the heating wire interposed therebetween.

  More preferably, the coarse aggregate in the upper layer portion includes silica, and the coarse aggregate in the lower layer portion includes blast furnace slag or steelmaking slag.

  The floor board having such a structure is fast in heating and slowly cools down naturally. In other words, it has the property of being easy to warm and difficult to cool. Thereby, even if it heats up rapidly by electric power supply ON and electric power supply OFF is made, the snow melting effect or the freeze prevention effect can be maintained. That is, ON / OFF control can be performed.

  More preferably, the first target temperature range is 2.0 to 2.5 ° C, and the second target temperature range is 0.5 to 1.0 ° C.

  The floor board having the property of being easily heated and difficult to cool provides a snow melting effect even at the lower limit value of 2.0 ° C. of the first target reference temperature, and an anti-freezing effect even at the lower limit value of 0.5 ° C. of the second target reference temperature. Since the target reference temperature can be set low, the power consumption can be reduced.

  In the above invention, it is preferably used for pavement at any of a tunnel exit location, tunnel entrance location, road slope location, toll gate location, and intersection location in a snowfall area.

  According to the present invention, the influence at the time of disconnection can be reduced. Furthermore, the maximum power and the power consumption can be reduced.

Partially broken perspective view of concrete paving slab Cross section of concrete pavement Heating wire wiring diagram Heating system conceptual diagram Temperature control selection function processing flow Power supply ON / OFF function processing flow Temperature history of feasibility study Conceptual diagram of power consumption Overall operation diagram Repair procedure

-Concrete paving plate configuration-
FIG. 1 is a partially broken perspective view of a concrete paving plate according to the present embodiment. FIG. 2 is a cross-sectional view. The concrete pavement plate 4 is disposed on the roadbed (ground) 2 via a heat insulating grout material 3 having a thickness of about 30 mm and functions as a part of the road.

  The heat insulating grout material 3 serves as a heat insulating material that blocks heat from the heating wire 9 embedded in the concrete pavement plate 4 from escaping to the roadbed 2 side. In some cases, a system heat insulating material is used.

  The concrete pavement plate 4 is a flat plate having various shapes based on a width of about 1750 mm, a length of 5000 mm, and a thickness of 180 mm. It has an intensity of 20 to 50 N (Newton) / cm 2 so that it can be applied to general roads that allow traffic such as automobiles. A plurality of concrete pavement plates 4 are laid out in a plane, and the adjacent concrete pavement plates 4 are connected by a joint device. As the coupling device, for example, a cotter type coupling device 6 as illustrated is used.

  The cotter-type joint device 6 includes a C-type joint metal fitting 6a that is a receiving metal piece inserted into the opposing concrete pavement plate 4, and an H-type metal fitting 6b that is an insertion metal fitting that can be attached to and removed from the opposite metal fittings. Consists of The opposing concrete pavement plates 4 are mechanically and firmly connected by a cotter-type joint device 6 and formed as a continuous single base.

  The concrete pavement plate 4 has a reinforcing bar 7 placed in a mold at the site or factory, and a predetermined amount of raw concrete is poured to form a lower layer portion 8a of about 120 mm. After laying the heating wire 9, a predetermined amount of raw concrete is poured from above the heating wire 9 to form an upper layer portion 8 b of about 60 mm, whereby the heating wire 9 is embedded and integrated in the concrete. . The integration eliminates the need for heat resistance and pressure resistance when the heating wire 9 is laid, and also improves durability and contributes to cost reduction.

  FIG. 3 is a wiring diagram of the heating wire 9 in the concrete pavement 4. The heating wire 9 is laid in a meandering manner in the plane direction.

  Moreover, the connection part (connector) 9a for electrically connecting the heating wire 9 is exposed to each end surface 10a of front, back, left, and right of the concrete pavement plate 4. On the other hand, C-type joint fittings 6a of the cotter-type joint device 6 are provided at the front, rear, left and right ends of the upper surface 10b of the concrete paving plate 4 so as to face each other.

  The concrete pavement plate 4 is composed of a lower layer portion 8a having a low thermal conductivity and an upper layer portion 8b having a high thermal conductivity. For example, crushed stone of about 5 to 20 mm is used for the coarse aggregate of the upper layer portion 8b, and crushed silica of less than 5 mm is used for the fine aggregate. A steelmaking slag of about 5 to 20 mm is used for the coarse aggregate of the lower layer portion 8a, and a steelmaking slag (flourized) of less than 5 mm is used for the fine aggregate.

  With this configuration, the thermal conductivity of the lower layer portion 8a is 1.1 to 1.2 kcal / mh ° C., and the thermal conductivity of the upper layer portion 8b is 3.2 kcal / mh ° C. Thereby, the heat by the heating wire 9 can be efficiently supplied to the road surface. Moreover, it can suppress that heat escapes to the roadbed 2 side. That is, the concrete pavement plate 4 is heated quickly by heating and slowly cooled naturally. In other words, it has the property of being easy to warm and difficult to cool.

~ Control system configuration ~
FIG. 4 is a conceptual diagram of the heating system according to the present embodiment.

  A plurality (six in the figure) of concrete pavement plates 4 are laid out in a plane and connected between adjacent concrete pavement plates 4 to form a pavement structure. However, in the drawing, they are not connected for convenience of explanation.

  The heating system includes a plurality of concrete pavement plates 4, a moisture sensor 41, a temperature sensor 42, a power supply device 45, and a control device 50.

  The moisture sensor 41 and the temperature sensor 42 are provided on the surface of the concrete pavement plate 4. The moisture sensor 41 and the temperature sensor 42 have a transmission function, and transmit information to the control device 50 via wired or wireless.

  The moisture sensor 41 may be provided outside the concrete pavement plate 4. Thereby, it can prevent that calcium chloride which is a main component of a snow melting agent misidentifies as a water | moisture content, and operate | moves.

  The power supply device 45 supplies electric power to each concrete pavement plate 4 (No. 1-6). That is, the heating wires 9 are electrically connected in parallel.

  In addition, when connecting the concrete heating plates 9 in series when connecting the concrete paving plates 4, the connected paving plates are regarded as one concrete paving plate 4. That is, the heating wires wired in series are further wired in parallel.

  The control device 50 controls ON / OFF of power supply from the power supply device 45 to each heating wire 9 (No. 1 to 6). The control device 50 includes a moisture sensor information acquisition function 51, a temperature sensor information acquisition function 52, a temperature control selection function 53, and a power supply ON / OFF function 54. The functional block is added to FIG.

  The moisture sensor information acquisition function 51 receives information (presence / absence of moisture) from the moisture sensor 41. The temperature sensor information acquisition function 52 receives information (temperature) from the temperature sensor 42.

  The temperature control selection function 53 selects one of the first temperature control and the second temperature control based on the information of the moisture sensor 41.

  FIG. 5 is a processing flow of the temperature control selection function 53. Moisture information is acquired via the moisture sensor information acquisition function 51 (step S11), and the presence or absence of moisture is determined (step S12).

  If it is determined in step S12 that there is moisture, a first target temperature range is set (step S13), and first temperature control is performed (step S14). Here, the first target temperature range is set by the first target reference temperature 2.0 ° C. and the fluctuation range + 0.5 ° C. That is, the first target temperature range is 2.0 to 2.5 ° C.

  The first target reference temperature 2.0 ° C. is a temperature at which a snow melting effect is obtained (described later). A fluctuation range is provided above as an allowable error.

  If it is determined in step S12 that there is no moisture, a second target temperature range is set (step S15), and second temperature control is performed (step S16). Here, the second target temperature range is set by the second target reference temperature 0.5 ° C. and the fluctuation range + 0.5 ° C. That is, the second target temperature range is 0.5 to 1.0 ° C.

  The second target reference temperature 0.5 ° C. is a temperature at which an antifreezing effect can be obtained (described later). A fluctuation range is provided above as an allowable error.

  At this time, the first target reference temperature (2.0 ° C.) is set higher than the second target reference temperature (0.5 ° C.).

  When the first temperature control (S14) is selected, the power supply ON / OFF function 54 controls the power supply so that the temperature of the temperature sensor 42 falls within the first target temperature range (2.0 to 2.5 ° C.). ON / OFF of power supply from the apparatus 45 to the heating wire 9 (No. 1 to 6) is controlled. Further, the power supply ON / OFF function 54 sets the temperature of the temperature sensor 42 within the second target temperature range (0.5 to 1.0 ° C.) when the second temperature control (S16) is selected. , ON / OFF of power supply from the power supply device 45 to the heating wire 9 (No. 1 to 6) is controlled.

  That is, the first temperature control (S14) and the second temperature control (S16) are different in target temperature range, but the control contents are the same.

  FIG. 6 is a processing flow of the power supply ON / OFF function 54. Temperature information is acquired via the temperature sensor information acquisition function 52 (step S21).

  At the same time, the switch information of the current power supply device 45 is acquired (step S22), and ON / OFF of the switch is determined (step S23).

  If it is determined in step S23 that the switch is ON, it is further determined whether or not the temperature in step S21 exceeds the upper limit value of the temperature range (step S24).

  If it is determined in step S24 that the temperature range upper limit is exceeded, the power supply device 45 is instructed to switch the switch from ON to OFF (step S25). On the other hand, if it is determined that the temperature range is not more than the upper limit of the temperature range, the switch is kept ON (step S26). That is, no command is output.

  If it is determined in step S23 that the switch is OFF, it is further determined whether or not the temperature in step S21 is less than the temperature range lower limit value (step S27).

  If it is determined in step S27 that the temperature is lower than the lower limit of the temperature range, the power supply device 45 is instructed to switch the switch from OFF to ON (step S28). On the other hand, when it is determined that the temperature range is lower than the lower limit value, the switch OFF is continued (step S29). That is, no command is output.

  When any of the processes in steps S25 to 29 is performed, the process returns to step S21.

~ System operation ~
The inventor conducted a demonstration experiment of the heating system according to the present embodiment. Naturally, the results differed depending on conditions such as outside temperature, snowfall, and snow quality. Therefore, based on a plurality of experimental results, a feasibility study was conducted in a virtual environment where the outside air temperature was 0 ° C. and the amount of snowfall was 30 mm. For convenience, the concrete paving slab 4 is one sheet.

  Based on the results of the demonstration experiment in which the first target reference temperature and the second target reference temperature are changed to various values, the inventor has a lower limit value of 2.0 ° C. at which the snow melting effect is obtained in the virtual environment, It was determined that the lower limit value for obtaining the antifreezing effect was 0.5 ° C. The first target reference temperature 2.0 ° C. and the second target reference temperature 0.5 ° C. are the lower limit values in the virtual environment, and the first target reference temperature and the second target reference temperature are appropriately determined according to the actual environment. Set. Accordingly, the first target temperature range of 2.0 to 2.5 ° C. and the second target temperature range of 0.5 to 1.0 ° C. are appropriately set.

  FIG. 7 is a diagram showing a temperature history of the feasibility study. The horizontal axis indicates the elapsed time t, and the vertical axis indicates the temperature of the temperature sensor.

  Assuming that the temperature of snow cover is 0 ° C., the temperature of the temperature sensor is 0 ° C. in the initial state (t = 0.0h). Heating is started in this state. The concrete pavement plate 4 has a characteristic that the temperature rise by heating is fast (shown, large positive inclination).

  The control device 50 determines that there is moisture due to snow accumulation and performs first temperature control (S11 → S12 → S13 → S14). On the other hand, naturally, since the switch is OFF and the first temperature range lower limit is less than 2.0 ° C., the control device 50 commands the switch to be switched from OFF to ON (S21 → S22 → S23 → S27 → S28 → S21). ).

  Heating starts when the switch is turned on. The concrete pavement plate 4 is rapidly heated while melting snow gradually. When the first target reference temperature is 2.0 ° C. or higher, a sufficient snow melting effect is exhibited.

  The control device 50 continues the switch ON until the first temperature range upper limit of 2.5 ° C. is exceeded (S21 → S22 → S23 → S24 → S26 → S21 → repeat).

  The temperature of the temperature sensor exceeds 2.5 ° C. at t = 1.3h. Discontinue heating to avoid unnecessary heating.

  During the melting of snow, the controller 50 determines that there is moisture and performs the first temperature control (S11 → S12 → S13 → S14). On the other hand, since the switch is ON and the first temperature range upper limit is over 2.5 ° C., the control device 50 commands the switch to be switched from ON to OFF (S21 → S22 → S23 → S24 → S25 → S21).

  Heating is interrupted by turning off the switch. The concrete pavement plate 4 has a characteristic that the natural temperature drop is slow (illustration, negative inclination is small). Since the first target reference temperature is 2.0 ° C. or higher, the snow melting effect continues even when heating is interrupted. The temperature of the concrete pavement plate 4 gradually decreases while continuing to melt snow.

  The control device 50 continues the switch OFF until the first temperature range lower limit is less than 2.0 ° C. (S21 → S22 → S23 → S27 → S29 → S21 → repeat).

  The temperature of the temperature sensor becomes less than 2.0 ° C. at t = 3.0h. Reheat to maintain snow melting effect.

  During the melting of snow, the controller 50 determines that there is moisture and performs the first temperature control (S11 → S12 → S13 → S14). On the other hand, since the switch is OFF and the first temperature range lower limit is less than 2.0 ° C., the control device 50 commands the switch to be switched from OFF to ON (S21 → S22 → S23 → S27 → S28 → S21).

  Heating resumes when the switch is turned on. While continuing to melt snow, the concrete pavement plate 4 is heated rapidly.

  The control device 50 continues turning on the switch (S21 → S22 → S23 → S24 → S26 → S21 → repeat).

  Snow melting is completed at t = 3.3 h during the rapid temperature increase. This shifts the focus from the snow melting effect to the freeze prevention effect.

  Since there is no snow, the controller 50 determines that there is no moisture and performs the second temperature control (S11 → S12 → S15 → S16). On the other hand, since the switch is ON and the second temperature range upper limit is over 1.0, the control device 50 commands the switch to be switched from ON to OFF (S21 → S22 → S23 → S24 → S25 → S21).

  Heating is interrupted by turning off the switch. The concrete pavement plate 4 cools down slowly. The concrete pavement plate 4 has a characteristic that the natural temperature drop is slow. At this time, since the second target reference temperature is 0.5 ° C. or higher, the freeze prevention effect is exhibited even when heating is interrupted.

  The control device 50 continues the switch OFF until the second temperature range lower limit is less than 0.5 ° C. (S21 → S22 → S23 → S27 → S29 → S21 → repeat).

  And the temperature of a temperature sensor will be less than 0.5 degreeC in t = 8.1h.

  There is no snow, and the controller 50 determines that there is no moisture and performs the second temperature control (S11 → S12 → S15 → S16). On the other hand, since the switch is OFF and the second temperature range lower limit is less than 0.5 ° C., the control device 50 commands the switch to be switched from OFF to ON (S21 → S22 → S23 → S27 → S28 → S21).

  Heating resumes when the switch is turned on. The concrete pavement plate 4 is rapidly heated while maintaining the antifreezing effect.

  The control device 50 continues turning on the switch (S21 → S22 → S23 → S24 → S26 → S21 → repeat).

  The temperature of the temperature sensor exceeds the second temperature range upper limit 1.0 ° C. at t = 8.6h. Discontinue heating to avoid unnecessary heating.

  There is no snow, and the controller 50 determines that there is no moisture and performs the second temperature control (S11 → S12 → S15 → S16). On the other hand, since the switch is ON and the second temperature range upper limit exceeds 1.0 ° C., the control device 50 instructs the switch to be switched from ON to OFF (S21 → S22 → S23 → S24 → S25 → S21).

  Thereafter, the switch is repeatedly turned on and off, and the temperature of the temperature sensor is controlled to be within the second target temperature range of 0.5 to 1.0 ° C., thereby maintaining the freeze prevention effect.

-Comparison with comparative examples-
As a comparative example, the heating of a conventional general concrete pavement plate will be examined. The concrete pavement plate 4 of the present embodiment has a characteristic that the temperature rise by heating is fast and the natural temperature drop is slow, whereas the concrete pavement plate of the comparative example has a slow temperature rise by heating and the natural temperature drop is fast. Has characteristics. In other words, it has the property of being easy to cool without being warmed. On the other hand, the specifications of the heating wire 9 and the power supply device 45 are at the same level. The same applies to the virtual environment.

  The temperature history of the comparative example is added to FIG.

  As the heating starts, the concrete pavement plate gradually warms (small positive slope) while gradually melting snow. When the reference temperature is 3.0 ° C. or higher at t = 5.2 h, a sufficient snow melting effect is exhibited. In addition, since the concrete pavement plate of the comparative example has a large influence of thermal diffusion, the reference temperature is higher than that of the present embodiment.

  At a temperature of 3.0 ° C., the supply energy by heating and the energy consumption of snow melting are balanced.

  At this time, if heating is temporarily interrupted, the concrete pavement plate of the comparative example suddenly drops in temperature (a negative slope is large) (broken line in the figure). Therefore, if the switch ON / OFF control is performed as in this embodiment, the snow melting effect cannot be maintained. That is, in the concrete paving slab of the comparative example, the switch ON / OFF control cannot be performed.

  Conversely, switch ON / OFF control can be performed by developing the concrete pavement plate 4 of this embodiment.

  Returning to the description of the temperature history of the comparative example. A balanced state continues at a temperature of 3.0 ° C., and snow melting is completed at t = 7.8 h.

  As described above, in the concrete paving slab of the comparative example, switch ON / OFF control cannot be performed. Even in an actual environment, the switch ON / OFF control cannot cope with a sudden snowfall. Therefore, heating is continued. The concrete paving slab warms up slowly.

  This embodiment is compared with a comparative example.

  FIG. 8 is a conceptual diagram of power consumption.

  In this embodiment, switch ON / OFF control is performed, and power is supplied only while the switch is ON. In contrast, the comparative example always supplies power.

  In the present embodiment, the first temperature control is selected during snow accumulation, and the second temperature control is selected upon completion of snow melting. The second temperature control can reduce the power consumption compared to the first temperature control. On the other hand, the comparative example does not perform such control.

  With these controls, the heating system according to the present embodiment can reduce power consumption.

  Moreover, this embodiment can melt snow faster than the comparative example (see FIG. 7).

~ Operation of the whole system ~
FIG. 9 is a diagram for explaining the operation of the entire heating system according to the present embodiment. The illustrated configuration is a simplified version of the configuration in FIG. The shades of the first temperature control and the second temperature control indicate power consumption.

  The characteristic configuration of this embodiment will be briefly described again. The heating wire 9 (No. 1-6) of each concrete pavement plate 4 is wired in parallel. The control apparatus 50 selects 1st temperature control or 2nd temperature control, and controls ON / OFF of electric power supply. The power supply device 45 supplies electric power to each heating wire 9 (No. 1 to 6) based on a command from the control device 50.

  By the way, the amount of snow at the tunnel exit location, tunnel entrance location, road slope location, tollgate location, and intersection location is not uniform due to various factors such as wind direction, topography, obstacles, and traffic volume. For example, it is assumed that the amount of snow on the concrete pavement plates (No. 1 to 6) is 0 to 60 mm.

  At this time, in the concrete pavement plate with snow (No. 1 to 5), the first temperature control is performed in anticipation of a snow melting effect, and in the concrete pavement plate 4 without snow (No. 6), antifreezing effect is expected. Then, the second temperature control is performed.

  Furthermore, in the concrete pavement plate (No. 3 and 5) with little snow accumulation, the second temperature control is performed upon completion of snow melting. In the other concrete pavement plates (Nos. 1, 2, and 4), the second temperature control is sequentially performed upon completion of snow melting.

  The second temperature control can reduce the power consumption compared to the first temperature control. Thereby, while performing snow melting reliably, compared with heating uniformly, electric power consumption can be reduced.

  Moreover, there is a concrete pavement plate (No. 1 to 6) in which power supply is turned off in the first temperature control and the second temperature control. Thereby, the maximum electric power in the whole system can also be reduced.

  Furthermore, the influence at the time of a disconnection is demonstrated.

  Due to the parallel arrangement of the heating wires, even when one of the heating wires is disconnected, the other heating wires can be heated and snow melting can be continued.

  Moreover, the control apparatus 50 can detect a disconnection easily by not raising temperature even if it supplies electric power. Moreover, the system administrator can detect visually that only the disconnection location is not melted. In this way, it is easy to detect disconnection.

  Furthermore, since the concrete pavement plate can be attached and detached and only the broken concrete pavement plate needs to be replaced, the repair is easy. The repair procedure is described below.

  Thus, the heating system according to the present embodiment can reduce the influence at the time of disconnection.

~ Repair procedure ~
FIG. 10 is a diagram showing a repair procedure at the time of disconnection. The illustration shows an example in which two pavement plates are electrically connected in series and the connected pavement plate is regarded as one concrete pavement plate 4. As described repeatedly, a plurality of concrete paving slabs 4 are electrically connected in parallel.

  The concrete pavement plate 4 is mechanically and firmly connected by a cotter type joint device 6. First, the electrical connection is released (procedure 1). While cutting a joint part with a cutter, the H-shaped metal fitting 6b is removed (procedures 2 and 3). Thereby, mechanical connection can be cancelled | released and the concrete pavement plate 4 which was disconnected can be removed with a rough terrain crane etc. (procedure 4).

  The existing back grout 3 is removed, and the roadbed 2 is adjusted again (procedures 5 and 6). Furthermore, a new concrete pavement plate 4 is installed by a rough terrain crane or the like (procedure 7).

  The H-shaped bracket 6b is inserted into the C-shaped joint bracket 6a, and the cotter-type joint device 6 is temporarily tightened (procedure 8). The back grouting 3 is newly injected and the cotter joint device 6 is temporarily tightened (procedures 9 and 10). Thereby, the concrete pavement plate 4 is mechanically and firmly connected to another concrete pavement plate.

  Finally, the concrete pavement plate 4 is electrically connected in parallel (procedure 11).

Reference Signs List 2 Subbase 3 Insulating grout material 4 Concrete pavement plate 6 Cotter joint device 7 Reinforcing bar 8a Lower layer 8b Upper layer 9 Heating wire 10a End surface 10b Upper surface 41 Moisture sensor 42 Temperature sensor 45 Power supply device 50 Controller 51 Moisture sensor information acquisition function 52 Temperature sensor information acquisition function 53 Temperature control selection function 54 Power supply ON / OFF function

Claims (7)

It is a pavement structure in which a plurality of floor slabs with heating wires embedded in concrete are laid out in a plane,
A pavement structure characterized in that the heating wires are electrically connected in parallel. A power supply;
The pavement structure according to claim 1, further comprising: a control device that controls ON / OFF of power supply from the power supply device to the heating wire of each floor board. The floor slab is connected to a moisture sensor and a temperature sensor,
The control device includes:
Based on the information of the moisture sensor, select one of the first temperature control and the second temperature control,
When selecting the first temperature control, the power supply is controlled so that the temperature of the temperature sensor falls within a first target temperature range including a first target reference temperature,
When selecting the second temperature control, the power supply is controlled so that the temperature of the temperature sensor falls within a second target temperature range including a second target reference temperature,
The pavement structure according to claim 2, wherein the first target reference temperature is set higher than the second target reference temperature. 4. The pavement structure according to claim 2, wherein the floor slab includes an upper layer portion having a high thermal conductivity and a lower layer portion having a low thermal conductivity with the heating wire interposed therebetween. The coarse aggregate of the upper layer part includes silica stone,
The pavement structure according to claim 4, wherein the coarse aggregate in the lower layer portion includes blast furnace slag or steelmaking slag. The first target temperature range is 2.0 to 2.5 ° C.,
The pavement structure according to claim 5, wherein the second target temperature range is 0.5 to 1.0 ° C. The pavement structure according to any one of claims 1 to 6, wherein the pavement structure is used for pavement at any one of a tunnel exit site, a tunnel entrance site, a road slope site, a toll gate site, an intersection site and a sidewalk site in a snowfall area.