JP2006169936A - Sprinkling snow melting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sprinkling snow melting method according to which a sprinkling amount per block can be set to an appropriate flow rate by adjusting a time period of sprinkling from a sprinkling means at every block, to thereby eliminate waste in sprinkling, and make effective use of a limited amount of high-temperature hot-water supplied from a boiler. <P>SOLUTION: According to the sprinkling snow melting method, a sprinkling target area is divided into the plurality of blocks 1, and sprinkling means 2 are provided for the respective blocks 1, followed by successively flowing water to the sprinkling means 2 from a downstream side toward an upstream side, to thereby carry out sprinkling at every block. In the method, timers which can be set at different output time periods, are set to sprinkling time periods individually different from each other, and after a predetermined time period of the first timer has elapsed, the subsequent timer is activated and then the activation is terminated. In this manner on-off valves corresponding to the respective timers are successively opened and closed, to thereby carry out sprinkling of high-temperature water supplied from the hot water supply boiler. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a sprinkling snow melting method for melting snow with a small amount of high-temperature water.

  A method of melting snow on roofs and road surfaces by spraying groundwater is a snow melting method that has been widely used. If there is not enough water, a new well must be established. If the necessary amount of water cannot be secured, the roof area where water can be sprayed will be limited. This shortage of hot water will eventually develop into snow if it continues to snow, and will require manual snow removal. In the case of snow melting for civilian roofs, if the roof area is large, the labor cost associated with snow removal is enormous, so to avoid this, we have established a deep well to secure the amount of water and respond to this. There are limitations.

As a countermeasure, there is a method of installing a boiler and warming and using the return water from the roof and river water. The basis of this method is to install a boiler with the ability to compensate for the lack of heat, while ensuring the amount of water by reusing wastewater or introducing river water, and spraying low-temperature water all at once from the watering means. It is something to try to cope with.
However, in this conventional method, since a large amount of water is heated to a temperature about the level of groundwater, the amount of heat input per unit area is small and the melting of snow is slow. As a result, there is a disadvantage that fuel consumption is high because water cannot be melted only by watering at the time of snowfall and water must be sprayed after the snow stops.
JP 2000-220321 A

  The problem to be solved is that if the amount of hot water that can be secured for the planned size of the snowmelt roof is small, it will interfere with snowmelt, and even if it is supported by an auxiliary heat source, it is necessary to prepare for high fuel efficiency. is there.

  The present invention performs hot water sprinkling on the scale of a hot water boiler that can divide the roof surface and the road surface into small parts, throws a large amount of heat into a small area of the snow melting surface in a short time, and changes the water sprinkling location from the downstream to the upstream The main feature is to cover a wide snow melting surface.

  Since it is processed for each area that matches the boiler's high-temperature hot water discharge capacity, it is difficult to melt and melt unevenly on the snow melting surface. Since it can be lifted up, it is not necessary to waste warm water. Since the amount of water spray is small, the high-temperature water in the boiler can be sprayed directly without diluting, and a large amount of snow can be treated rapidly in a short time. Since the watering time from the watering means can be adjusted for each block, the watering amount for each block can be set to an appropriate flow rate, and there is no waste in watering. It is also possible to water by specifying a block. There is an advantage that a limited amount of high-temperature water discharged from the boiler can be used effectively.

  The purpose of melting snow over a large area with high-temperature water with a small amount of water was realized under simple operating procedures.

  FIG. 1 is a perspective view of a snow slope, for example, a roof, used for explaining a watering method according to the present invention. The water spray area for melting snow is divided into a plurality of blocks. The 600-square-meter roof used for the description forms blocks 1 for melting snow in total, divided into five rows and six columns. Each of these blocks 1 is provided with watering means 2. The watering means 2 is a watering header in the illustrated example. The upper and lower intervals of the watering header are about 4 meters, the length is about 10 meters, the diameter is 40φ, and the diameter of the hot water supply pipe 3 connected to this is 20φ.

  It is preferable that the roof surface has a high frictional resistance against snow and has a property of stopping the sliding of the snow and the sherbet during melting. This non-slip property can be obtained, for example, by using a flow down regulation sheet described in JP-A-8-184216 (Japanese Patent Application No. 6-339265) by the same applicant as the present application. This sheet is made of a woven fabric using spun yarn, and the snow on the surface is hard to slip. In addition, it regulates the behavior of hot water flowing down, disperses the flow, spreads it uniformly, and has an efficient heat exchange performance that contacts the snow layer. The sheet is low in liquid content, absorbs part of the flowing heat medium, and the main flow path of arbitrary width to form the main stream of the exposed fast flow heat medium where the remaining part slides on the surface. It is composed of a liquid-absorbing material that is located on the side of the path and has a sub-flow path with a larger liquid content than the main flow path that forms a sub-flow with a slower flow rate than the main flow.

  The area of each block 1 on the roof is 20 square meters. The amount of water sprayed by one watering means is about 800 cc per minute per square meter and about 16 liters / minute per block. As the watering temperature, high-temperature water obtained by raising the ground water at 15 degrees Celsius from 50 degrees Celsius to 60 degrees Celsius was used. On a long roof with a 4 inch gradient, if water is sprayed during the daytime around 1 degree below freezing point, hot water is sprayed at a water temperature of 53 degrees per 20 square meters in a 10m x 2m block. It can be almost erased.

In the example shown in FIG. 1, the hot water supply pipe 3 is connected via a boiler 30 to a pump 31 for a groundwater well. Although the amount of groundwater required is about 20 liters per minute, if it is less than this, intermittent operation is performed while storing water in the water receiving tank 32 as shown in FIG. When the groundwater contains iron or magnesium, an iron removal device 36 can be interposed between the boiler 30 and the well 34 and between the receiving tank 32 and the well 34.
If there is a lot of water in the well, the block area can be set accordingly.

An electrically operated on-off valve 4 is arranged at a midway position of the hot water supply pipe 3 reaching the individual watering means 2.
The on-off valve 4 is opened and closed, and water is sequentially passed through the watering means 2 to perform watering operation for each block. In the illustrated example, the on-off valve 4 is an electric three-way valve. This three-way valve closes the path leading to the hot water supply boiler, and can drain water from the hot water supply pipe 3 between the on-off valve and the sprinkling means 2 through the drain port 4a. A two-way solenoid valve can be used instead of this type of three-way valve if the on-off valve is at a higher position than the sprinkling means and the water in the pipe naturally falls.

As shown in FIG. 3, each of the on-off valves 4 in charge of the roof is individually set to an open time by a variable output time timer for generating an operation output.
For convenience of explanation, timers A to M are shown in FIG. These timers are described as being responsible for the on-off valves of the hot water supply pipes leading to the sprinkling means of a total of seven blocks in the lowest order in the two rows and the third row of the roof block in FIG. A is an on-off valve of the lowest watering means, B is an on-off valve of the upper watering means, and F is an on-off valve of the uppermost watering means. Similarly, G is an on-off valve of the lowest watering means, H is an on-off valve of the upper watering means, and L is an on-off valve of the uppermost watering means. Similarly, M is in charge of opening / closing the lowest on-off valve of the adjacent block.

  The opening output time to the on-off valve 4 is individually set for each of the timers A to M, but for convenience of explanation, for example, each can be unified to 10 minutes. In operation, for example, the first timer A is activated to open the on-off valve 4 and start watering to the lowest watering means 20. After 10 minutes, the timer A expires and the on-off valve 4 is closed. Subsequent timer B is started after a time difference of several minutes to several tens of minutes, and the on-off valve 4 is opened for 10 minutes to start supplying warm water to the second stage watering means from the bottom. After 10 minutes, the timer B expires and the on-off valve 4 is closed. Similarly, output and time-up are repeated in the order of timers C, D, E, and F, and the on-off valves assigned to each are sequentially opened and closed, and the water is sprayed while moving from the lower stage to the middle stage and further to the upper stage. continue. Subsequently, the same output and time-up are repeated from timer G to L and further to M, and the snow melting region is moved from the downstream block to the upstream block.

  For convenience of explanation, the snow melting process of the block has been described as moving vertically from the downstream side to the upstream side, but this is also applicable when moving a plurality of columns in the horizontal direction. Specifically, the lowest block among the blocks in each column is preferentially processed in order, and then the process proceeds to the second block from the bottom. The order of block movement from the downstream side to the upstream side is a matter of choice.

  After all of the timers have timed up, if necessary, reset means X1, X2, X3 may be installed and placed for the purpose of resetting all of these timers and starting them again sequentially from the first timer. it can. The reset means X1 is a manual reset switch. Used as a switch to restart a series of timers timed up by manual operation. X2 is a timer switch that performs an on / off operation at regular intervals. For example, it is possible to turn off the power of these timers while a series of timers have timed up, and to restart the time series operation of the timers by issuing an ON output after a predetermined time has elapsed. When the snow continues, or according to the remaining snow condition, the output function of the timer can be restored by the function of the reset means X2, and water spraying can be repeated from the water spray means. X3 is a reset switch for designating timers of the corresponding blocks when the remaining snow is visually recognized, resetting these timers and sequentially operating the on-off valves to spray water.

  Long snow cover can be processed regardless of the number of sprinkling means, so long-sized roofs of thousands to tens of thousands of square meters such as factories, station buildings, and public facilities using small well facilities or boiler facilities It can also be applied to railway floors and road surfaces that extend over several kilometers.

  It is a top view which shows the example of arrangement | positioning of a sprinkling means, and a hot water supply system.   It is explanatory drawing which shows the specific example of a timer control system.   It is explanatory drawing which shows the Example of a hot water supply system.

Explanation of sign

DESCRIPTION OF SYMBOLS 1 Block of watering area 2 Watering means 3 Hot-water supply pipe 4 On-off valve A to M Timer

Claims (7)

  The water spray area on the roof and road surface is divided into a plurality of blocks from the upstream side to the downstream side, and water spraying means are installed in each block, while a plurality of hot water pipes from the water supply source to the individual water spraying means through the hot water boiler On the other hand, an electric on-off valve is arranged in the middle position of each of these hot water supply pipes, and each on-off valve is opened and closed to sequentially pass watering means to perform watering operation for each block. Each of these on-off valves is individually set to an open time by a variable output time timer that outputs an operation output, and after the timer of the on-off valve in charge of the downstream block has timed up, it is responsible for these on the upstream block Subsequent timers start and operate sequentially to increase the time and open and close the on-off valves that each share in turn, and from each watering means a hot water boiler is turned on. Sprinkling snow melting method for performing watering hot water obtained by bulk.   The sprinkling snow melting method according to claim 1, wherein after all of the timers have timed out, the resetting means which resets all of the timers and sequentially starts again from the first timer, depending on the remaining snow condition. Watering snow melting method that repeats watering from the top.   The watering snow melting method according to claim 1, wherein after all of the timers have timed up, a reset unit that resets some of these timers and sequentially operates again is selected according to a partial remaining snow condition. Sprinkling snow melting method to spray water from watering means.   The water spray snow melting method according to claim 1, wherein the hot water supply pipe is connected to a groundwater well through a hot water boiler.   The sprinkling snow melting method according to claim 1, wherein the hot water supply pipe is connected to a groundwater well through a hot water boiler and a water receiving tank.   The sprinkling snow melting method according to claim 1, wherein the hot water supply pipe is connected to a groundwater well through a hot water boiler and an iron removal device.   The sprinkling snow melting method according to claim 1, wherein the hot water supply pipe is connected to a ground water well through a hot water boiler, a water receiving tank, and an iron removal device.

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