JPH06136715A - Precast concrete floor slab for bridge - Google Patents

Abstract

PURPOSE:To thaw snow on a paved road by embedding a hot water pipe, an electric heater or a heat pipe in a concrete floor slab to form a paved road for a bridge. CONSTITUTION:A force feed pipe 11 and a drain pipe 12 are arranged in a recessed area 8 lined in the longitudinal direction of a concrete slab 3. The ends 6A, 6B of a warm water pipe 6 are connected to the force feed pipe 11 and the drain pipe 12, respectively. The force feed pipe 11 and the drain pipe 12 are connected to a heater 16 and a force feeder 17. In a winter season or when checking valves 13, the force feed pipe 11 and the drain pipe 12, a cover 14 is first opened to operate both valves 13. Warm water warmed up by the heating 16 or antifreezing fluid is carried into the warm water pipe 6. It is thus possible to thaw snow on a paved road B, prevent freezing thereof and facilitate construction in comparison to the case of providing additional thawing equipment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a precast concrete slab for bridges, and more particularly to a precast concrete slab for bridges having a snow-removing function.

[0002]

2. Description of the Related Art In recent years, precast concrete floor slabs having excellent workability and abrasion resistance have been used for forming paved surfaces in the construction of bridges and the like. In addition, construction time using this type of concrete floor slab can be shortened, so construction time is limited for construction of existing bridges. It is also often used for repairs.

[0003]

In the above-mentioned prior art, by using the concrete floor slab on the paved surface of the bridge, it is possible to carry out the construction in a short time even in the case of new or existing repair. By the way, in areas where there is snow or freezing on roads during the winter season, snow removal equipment such as snow removal pipes is installed to secure traffic during the snow cover period. In bridges that are difficult to achieve, snow is mainly collected by snowplows.
However, it is difficult to secure constant traffic only by such snow removal work, and there is a problem that traffic congestion occurs at such bridge locations.

Therefore, an object of the present invention is to solve the above problems and provide a precast concrete floor slab for bridges capable of removing snow on the pavement surface of the bridge.

[0005]

According to a first aspect of the present invention, in a concrete floor slab forming a paved surface of a bridge, a hot water pipe is embedded in the concrete floor slab, and the hot water pipe can be connected to a hot water supply device. It is provided.

According to a second aspect of the present invention, in a concrete floor slab forming a paved surface of a bridge, an electric heater is embedded in the concrete floor slab, and the electric heater is connectable to a power source.

According to a third aspect of the present invention, in a concrete floor slab forming a paved surface of a bridge, a heat pipe is embedded in the concrete floor slab, and the heat pipe is provided so as to be connectable to a heat source supply device. .

[0008]

According to the structure of claim 1, a concrete floor slab is laid on a bridge to form a pavement surface, and the pavement surface is warmed by hot water flowing through a hot water pipe to remove snow and prevent freezing.

Further, according to the above-mentioned structure, the concrete floor slab is laid on the bridge to form a pavement surface, and the pavement surface is heated by the heat of the electric heater to remove snow and prevent freezing.

According to the third aspect of the invention, a concrete floor slab is laid on the bridge to form a pavement surface, and the pavement surface is warmed by the heat of the heat pipe to remove snow and prevent freezing.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the accompanying drawings. 1 and 2 showing the first embodiment, reference numeral 1 denotes an H-shaped main girder made of steel or prestressed concrete such as a bridge A, and the main girder 1 has a flange portion 2 formed in the vertical direction thereof. A plurality of precast concrete floor slabs 3 are installed in parallel on the upper surface of the above to form a flat paved surface B which can pass on both sides. In the concrete floor slab 3, bulging edge portions 4 are integrally formed on both sides in the width direction of a flat plane portion, and the concrete floor slab 3 is placed on the rebar 5 in a formwork (not shown) at the factory. A hot water pipe 6 made of a polybutene pipe, a stainless pipe or the like is arranged in a meandering shape, concrete is placed in the mold, and a plurality of through holes 7 are formed in the length direction.
Further, one of the left and right bulged edges 4 is formed with a recess 8 whose upper surface is open continuously in the length direction, and the bottom of this recess 8 is inserted to insert a pipe end 6A of the hot water pipe 6, 6B is the recess 8
The hot water pipe 6 can be connected to a hot water supply device described later. Further, the left and right bulged edge portions 4 are formed with mounting holes 10 for mounting the balustrade 9 formed by combining steel pipes and the like. A hot water pumping pipe 11 and a drain pipe 12 can be housed in the recess 8, and one pipe end 6A of the hot water pipe 6 is connected to the pumping pipe 11 via an opening / closing valve 13 such as a bowl valve. And the other pipe end 6B of the hot water pipe 6 is provided so as to be connectable to the drain pipe 12 via an opening / closing valve 13. A plate-like removable lid 14 having a length substantially equal to that of the concrete paving slab 3 or a length obtained by dividing the length into a plurality of pieces is provided on the upper portion of each recess 8. Reference numeral 15 denotes a PC steel material which is inserted into the through holes 7 of the concrete floor slabs 3 installed on the main girder 1. The both ends of the PC steel material 15 are tensioned by fixing tools (not shown), and the plurality of concrete floor slabs 3 are Is integrated into tension. In addition, the hot water warmed by the heater 16 is pressure-fed to the pressure feed pipe 11 by a pressure feed device 17 such as a pump, and the hot water flows in the hot water pipe 6 of each concrete floor slab 3,
The water is drained from the drain pipe 12 and circulated. Then, the pressure feeding pipe 11, the drainage pipe 12, the heater 16 and the pressure feeding device 17
The hot water supply device 18 is configured by the above. Also that heater
As 16 is used a boiler or a burner that uses kerosene or city gas as a fuel.

Next, the construction of the pavement surface B in the bridge A using the concrete floor slab 3 having the above construction will be described.
First, a plurality of the concrete slabs 3 are lined up and installed on the main girder 1 after completion according to a conventional method, and the height of each concrete slab 3 is adjusted. Filling with a filling material such as shrinkage mortar, inserting the PC steel material 15 into the through hole 7, and tightening both ends of the PC steel material 15 with fixing tools to form a plurality of concrete slabs 3
Unify the tension. When the fixing of the concrete slab 3 to the main girder 1 is completed, the pumping pipe 11 and the drainage pipe 12 are piped in the recesses 8 arranged continuously in the length direction of each concrete slab 3, and each concrete The pipe end 6A of the hot water pipe 6 of the floor slab 3,
6B is connected to the pumping pipe 11 and the drain pipe 12 via valves 13 respectively. After this, the upper portion of the recess 8 is closed by the lid 14. In this case, the pipe ends 6A and 6B and the valve 13 are connected via a flexible pipe (not shown), or the pressure feed pipe 11 and the pipe end 6A are connected.
A constant flow valve (not shown) that keeps the amount of hot water constant may be provided between and. Further, the pressure feeding pipe 11 and the drainage pipe 12 are connected to the heater 16 and the pressure feeding device 17. When the valve 13, the pressure feed pipe 11 and the drain pipe 12 are to be inspected during the winter season or the like, the lid 14 is opened and both valves in the recess 8 are opened.
Opening operation 13 is performed to flow the warm water warmed by the heater 16 or the warmed antifreeze liquid into the warm water pipe 6 to melt the pavement surface B.

As described above, according to the present invention, in the concrete floor slab forming the pavement surface B of the bridge A, the hot water pipe 6 is embedded in the concrete floor slab 3 and the hot water pipe 6 is connectable to the hot water supply device 18. Therefore, the hot water supply device 18 can be connected to the hot water pipe 6 of the concrete floor slab 3 that constitutes the pavement surface B of the bridge A to prevent snow from thawing and freezing on the pavement surface B during the winter. Moreover, by constructing the concrete floor slab 3 in which the hot water pipe 6 is embedded in advance in the factory and constructing the pavement surface B of the bridge A, the construction is easier and comparatively easier than the case where a snow-melting equipment is separately provided. The snow-melting function can be obtained at low cost.

Further, as an effect of the embodiment, a recess 8 is formed in the bulging edge portion 4 which forms a road shoulder and to which the balustrade 9 can be attached,
Since the pipe ends 6A and 6B of the hot water pipe 6 are provided in the recess 8 so as to face each other, the pipe ends 6A and 6B are provided to the hot water supply device.
18 can be easily connected, and the recess 8 is a pressure pipe.
11 and the drainage pipe 12 can be stored, and the piping work can be performed on the bridge A, and even after the construction, the pumping pipe 11 and the drainage pipe 12 are not exposed to the outside and spoil the aesthetics of the bridge. Never. Furthermore, the lid 14 can be removed and the valve 13 in the recess 8 can be operated. Unlike the case where the valve or the like is arranged at the bottom of the concrete paving slab, the operator operates the valve 13 on the bridge A. Also, the pumping pipe 11 and the drainage pipe 12 can be inspected, and the work and maintenance of them can be facilitated.

FIG. 3 shows a second embodiment of the present invention. The same parts as those of the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted. A concrete floor slab 3A obtained by dividing the concrete floor slab 3 shown in the example into two in the width direction is shown, and a recess 8 capable of accommodating a pumping pipe 11 and a drainage pipe 12 is formed in each of the bulging edges 4 of the left and right concrete floor slabs 3A. Is provided, and the pipe ends 6A and 6B of the hot water pipe 6 of the concrete floor slab 1A on the left side of the drawing are the pumping pipe 11 and the drain pipe 12 on the left side of the drawing.
Connected to the hot water pipe 6 of the concrete floor slab 3A on the right in the figure.
The pipe ends 6A and 6B are connected to the pressure feed pipe 11 and the drain pipe 12 on the right side of the figure, respectively. In addition, the pressure pipe 11 and drain pipe on the right side of the figure
Although not shown, 12 is also connected to the hot water supply device 18 on the left side of the drawing.

As described above, in this embodiment, in the concrete floor slab forming the pavement surface B of the bridge A, the hot water pipe 6 is embedded in the concrete floor slab 3A, and the hot water pipe 6 can be connected to the hot water supply device 18. Since it is provided on the pavement surface B of the bridge A, the snow pavement function can be obtained on the pavement surface B of the bridge A at a relatively low cost.

As an effect of the embodiment, since the concrete floor slab 3A is aligned left and right to form the pavement surface B, when repairing an existing bridge, traffic control is applied to only one side and the other is The paved surface B can be repaired by making it passable. Further, even if the pavement surface B is partially repaired after the construction, the concrete floor slab 3 at the repaired site
Only A needs to be replaced.

FIGS. 4 and 5 show a third embodiment of the present invention. The same parts as those of the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted. Hot water pipe
Reference numeral 21 denotes a pair of upper and lower tubes 22 and 23 integrally connected by a connecting portion 24. The hot water pipe 21 is made of a material such as plastic having excellent thermal conductivity, and one of the upper tubes 22 The end 22A and the other tube end 23B of the lower tube 23 are connected to the pressure feed tube 11 in the recess 8 via the opening / closing valve 13, respectively, and the other tube end 22B of the upper tube 22 and one of the lower tube 23 are connected. The pipe ends 23A are connected to the drain pipes 12 in the recesses 8 via open / close valves 13, respectively.

The hot water or antifreeze liquid heated by the heater 16 is supplied from the pressure feed pipe 11 to the hot water pipe 21, and in the upper tube 22, one pipe end 22A to the other pipe end 22B.
In the direction of arrow M, and conversely in the lower tube 23, flow from the other pipe end 23B to one pipe end 23A in the direction of arrow N,
It is drained from the drain pipe 12 and circulates. This allows hot water pipe 21
The hot water or antifreeze flowing through the tubes flows in opposite directions in the upper and lower tubes 22 and 23, and heat is exchanged between the upper tube 22 and the lower tube 23 while flowing in the opposite directions, so only in one direction. The pavement surface B of the precast concrete floor slab 3 is heated more uniformly than when flowing.

As described above, in this embodiment, in the concrete floor slab forming the paved surface B of the bridge A, the hot water pipe 21 is embedded in the concrete floor slab 3 and the hot water pipe 21 can be connected to the hot water supply device 18. Since it is provided, the pavement surface B of the bridge A can be provided with a snow-dissipating function at a relatively low cost because of easy construction.

Further, as an effect of the embodiment, the hot water pipe 21 is composed of a pair of tubes 22 and 23, and warmed hot water or antifreeze liquid is circulated in the tubes 22 and 23 in the opposite direction. It is possible to heat the pavement surface B of No. 3 evenly.

6 to 8 show a fourth embodiment of the present invention, in which the same parts as those in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted. An example of using a sheet heater 31 which is an electric heater for the precast concrete floor slab 3 is shown. As shown in the figure, a plurality of sheet heaters 31 are embedded in the concrete floor slab 3 at intervals. The sheet heater 3 covers, for example, a peripheral end portion of a sheet heating element 32 having a thickness of about 1.2 mm with an electrode protection seal 33, and aluminum foils 34 are provided on the upper and lower sides of the sheet heating element 33. A cable 36, which is covered with 35 and electrically connected to the planar heating element 33, faces the recess 8 and the cable 36 facing the recess 8 is connected to a power cable 37. 37 is connected to the power supply 38, and each sheet heater
31 is connected by a cable 36A. In this case, the cable 36 is connected to the power cable 37 by a connector (not shown) or the like.

As described above, in this embodiment, in the concrete floor slab forming the pavement surface B of the bridge A, the planar heater 31 which is an electric heater is embedded in the concrete floor slab 3, and the surface heater 31 is provided with the power source 38. The pavement surface B of the bridge A can be provided with a snow-dissipating function at a relatively low cost because the construction is easy to perform.

Further, as an effect of the embodiment, since the power source 38, that is, electricity is used, maintenance and inspection is relatively easy, and the power cable 37 and the cable 36 can be easily connected. Workability is improved.

FIG. 9 shows a fifth embodiment of the present invention, in which the same parts as those in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted. An example in which a linear heater 39 which is an electric heater is used in the plate 3 is shown. The linear heater 39 is embedded in a meandering shape as shown in the figure, and a cable 39 electrically connected to the linear heater 39.
A is exposed in the recess 8 and the cable 39A exposed in the recess 8 is connected to the power cable 37.
37 is connected to power supply 38. And the linear heater 39
Electricity is supplied to the pavement surface B of the bridge A by the heat generated by the linear heater 39.

As described above, in this embodiment, in the concrete floor slab forming the pavement surface B of the bridge A, the linear heater 39, which is an electric heater, is embedded in the concrete floor slab 3, and the linear heater 39 has a power source 38. The pavement surface B of the bridge A can be provided with a snow-dissipating function at a relatively low cost because the construction is easy to perform.

10 to 13 show a sixth embodiment of the present invention, in which the same parts as those in the first and second embodiments are designated by the same reference numerals and detailed description thereof will be omitted. ,
In this example, a heat pipe is used in the precast concrete floor slab 3A, and the heat pipe 41 is embedded as shown in the figure. The heat pipe 41 is composed of a main pipe 42 and a sub pipe 43 made of copper or the like having excellent thermal conductivity.
The outer tube 44 has a diameter larger than that of the main tube 42, and a connecting tube 45 arranged in parallel to the outer tube 44 is connected by a plurality of heat exchange tubes 46. Insert the main pipe 41 into 44,
Both ends of the outer tube 44 are sealed in the main tube 41, thereby forming a sealed space in the sub tube 43, and a predetermined amount of heat medium 47, for example, low-pressure CFC gas is enclosed in the sub tube 43. Further, the main pipe 42 side is embedded in the lower part on the bulging edge 4 side, and the connection pipe 45 side is arranged higher than the main pipe 42, and the heat exchange pipe
46 is sloping and buried. In addition, the pipe end 42A of the main pipe 42,
42B are provided so as to face the recesses 8 respectively, and open / close valve 13
The pipe end 42A is connected to the pressure feed pipe 11 and the pipe end 42B is connected to the drainage pipe 12 via.

The warm water or antifreeze liquid heated from the heat source supply unit 18A is supplied to the main pipe 42, and the heat medium 47, which is usually a liquid, is instantly vaporized by the heat and the heat exchange pipe.
The gas of the heat medium 47 having the latent heat that moves in the direction of the connecting pipe 45 inside the pipe 46 comes into contact with the inner surface of the heat exchange pipe 46 to release the latent heat and return to the liquid. The heating medium 47 that has been heated to the liquid flows back to the outer tube 44 due to the inclination of the heat exchange tube 46, receives heat again, vaporizes and moves to the heat exchange tube 46, and repeats similar steps. The pavement surface B is heated.

As described above, in this embodiment, in the concrete floor slab forming the paved surface B of the bridge A, the heat pipe 41 is embedded in the concrete floor slab 3A, and the heat pipe 41 is
Since 41 is provided so as to be connectable to the heat source supply device 18A, the snow pavement function can be obtained on the pavement surface B of the bridge A with ease of construction and at a relatively low cost.

Further, as an effect of the embodiment, the main pipe 42 and the auxiliary pipe
The heat pipe 41 composed of a combination of 43 heats the pavement surface B by using latent heat due to vaporization of the heat medium 47, so that the heat is quickly transferred from the main pipe 42 to the connecting pipe 45 of the auxiliary pipe 43 and the pavement is paved. Since the surface B can be heated uniformly, the heat loss is reduced, and the movement of the surface B does not require the pressure of a pump or the like, the capacity of the pumping device 17 can be small.
Furthermore, since the heat medium 47 is enclosed in the sub tube 43,
There is no risk of damage due to freezing. Also, the heat source supply device
18A has the same structure as the hot water supply device 18 of the first embodiment, but the pumping device 17 having a capacity smaller than that of the first embodiment can be used.

The present invention is not limited to the above embodiments, but various modifications can be made within the scope of the gist of the present invention. For example, the pressure pipe 11 and the drainage pipe 12 may be installed under the concrete floor slabs 3 and 3A through a support or the like. In this case, the pipe ends 6A and 6B are pre-fabricated at the factory. It is desirable to provide it so as to project from the lower surface. In addition, the concrete floor slabs 3 and 3A shown in the embodiments are not limited to the bridge A, but it is not possible or practically difficult to provide the pumping pipe 11 and the drainage pipe 12 under the concrete floor slabs 3 and 3A. Effective for construction. Further, the hot water supply device 18 may be of various types as long as it can supply hot water to the hot water pipes 6 and flow the hot water. For example, the hot water supply device 18 is not limited to the circulation type shown in the embodiment, and may be a water source. It may be of a type in which the water from the above is heated and pressure-fed to the pressure-feeding pipe 11, flows through the hot water pipe 6 and is drained from the drainage pipe 12 to another place. Further, the hot water pipe 6 may be made of various materials, and only the pipe ends 6A and 6B may be made of steel or stainless steel. A cord heater or the like may be used as the electric heater. Further, when the concrete slab 3 is provided in an inclined shape, the heat pipe 41 can be embedded in parallel with the pavement surface B which is the upper surface of the concrete slab 3, and is installed obliquely so that at least the connecting pipe 45 side is higher. You can leave it.

[0032]

According to the invention of claim 1, in a concrete floor slab forming a paved surface of a bridge, a hot water pipe is embedded in the concrete floor slab, and the hot water pipe is connectable to a hot water supply device. It is possible to provide a precast concrete floor slab for bridges that can remove snow on the pavement surface of the bridge.

According to a second aspect of the present invention, in a concrete floor slab forming a paved surface of a bridge, an electric heater is embedded in the concrete floor slab, and the electric heater is provided so as to be connectable to a power source. It is possible to provide a precast concrete floor slab for bridges capable of removing snow on the pavement surface.

According to a third aspect of the present invention, in a concrete floor slab forming a paved surface of a bridge, a heat pipe is embedded in the concrete floor slab, and the heat pipe is connectable to a heat source supply device. It is possible to provide a precast concrete floor slab for bridges that can remove snow on the pavement surface of the bridge.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a sectional view of an essential part showing a first embodiment of the present invention.

FIG. 3 is a perspective view showing a second embodiment of the present invention.

FIG. 4 is a perspective view showing a third embodiment of the present invention.

FIG. 5 is a partially cutaway perspective view of a main part showing a third embodiment of the present invention.

FIG. 6 is a perspective view showing a fourth embodiment of the present invention.

FIG. 7 is a sectional view of a sheet heater showing a fourth embodiment of the present invention.

FIG. 8 is a plan view of a sheet heater showing a fourth embodiment of the present invention.

FIG. 9 is a perspective view showing a fifth embodiment of the present invention.

FIG. 10 is a perspective view showing a sixth embodiment of the present invention.

FIG. 11 is a cross-sectional view of a main part showing a sixth embodiment of the present invention.

FIG. 12 is a perspective view of a heat pipe showing a sixth embodiment of the present invention.

FIG. 13 is a sectional view showing the operation of the heat pipe showing the sixth embodiment of the present invention.

[Explanation of symbols]

 3,3A Concrete floor slab 4 Bulging edge 6 Hot water pipe 6A, 6B Pipe end 18 Hot water supply device 18A Heat source supply device 21 Hot water pipe 31 Planar heater (electric heater) 38 Power supply 39 Linear heater (electric heater) 41 Heat Pipe A Bridge B Paved surface

Claims (3)

[Claims] 1. A concrete floor slab forming a paved surface of a bridge, wherein a hot water pipe is embedded in the concrete floor slab,
A precast concrete floor slab for bridges, characterized in that the hot water pipe is connectable to a hot water supply device. 2. A precast concrete floor slab for a bridge, comprising a concrete floor slab for forming a pavement surface of a bridge, wherein an electric heater is embedded in the concrete floor slab and the electric heater is connectable to a power source. . 3. A concrete slab for forming a pavement surface of a bridge, wherein a heat pipe is embedded in the concrete slab and the heat pipe is provided so as to be connectable to a heat source supply device. Floor slab.