JP2005320834A - Water sprinkling snow melting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem of increasing consumption of fuel due to lengthening of processing time by remarkably reducing in snow melting capacity, by an enlargement of a facility scale as the stage number of a water sprinkling means increases. <P>SOLUTION: An inclined snowfall surface is divided into a plurality of snow melting areas, and a plurality of stages of water sprinkling means are vertically arranged at an interval in the respective snow melting areas, and start water sprinkling by the water sprinkling means of the lowest stage, and successively perform water sprinkling snow melting operation with the water sprinkling means of the lowest stage and operation for cleaning residual snow of the downstream side processed snow melting area by using the water sprinkling means of the upper stage by arranging a time difference between the mutual snow melting areas. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a snow melting method by watering an inclined snow surface.

The method of melting snow by spraying warm water on the roof surface is an easy method, and is frequently used in areas where high quality groundwater can be secured because of low running costs. In areas where groundwater is not available, water is heated using a boiler.
Boiler heating water and groundwater are sent to sprinkling means circulated on the inclined snow cover, and are sprinkled all at once from each sprinkling means. Therefore, the surface area capable of melting snow is determined by the amount of groundwater that can be pumped up, and in the case of using boiler hot water, it is determined by the maximum amount of hot water discharged from one boiler. When the amount of water is insufficient, we have responded by drilling new wells or using multiple boilers. For this reason, this plan will be adopted if the initial equipment costs and future running costs are within the budget, otherwise alternative measures to change the roof structure will be considered. . There are many things to consider, but in the end it often goes back to the initial plan and often settles on the original draft roof. The design of the roof is sacrificed to fit within the budget, and the design of the roof is limited, but it is unavoidable because it is a heavy snowfall.

  However, in order to prevent danger on snowfall type sloped roofs, people and cars do not get close to the building, and snow that slides smoothly in the early stage is frozen on the painted surface of the iron plate roof due to secular change. Frequent and increases the risk. In addition, the fallen snow must be removed periodically even if it costs money.

  In the case of large-scale commercial facilities, these shortcomings are a major obstacle to management because they spend labor and money on maintaining and managing safety in winter. If a dangerous location that cannot be overcome is clarified at a later date, there are many cases where snow melting equipment is introduced at that location.

As countermeasures for this, methods using waste water or using low-temperature river water have been tried, but they cannot cope with heavy snow.
Most of the cases where applicants are consulted are about snowfall roofs. At this stage, roof snow melting is often adopted by drilling new wells or installing large hot water boilers.
JP2000-220321

  The problem to be solved is that the initial equipment costs associated with the introduction of the roof snow melting device and the running costs in the future are high.

  In order to reduce the amount of hot water sprayed for melting snow, the present invention mainly works to prevent the water temperature from lowering from the lower stage to the upper stage to prevent a decrease in the water temperature, and to perform efficient sprinkling and melting snow for each stage. Features.

  According to the sprinkling snow melting method of the present invention, the snow melting water from the upper stage does not flow into the lower water sprinkling and the temperature of the hot water is not significantly lowered as in the prior art. Therefore, the sprinkled hot water contacts and is absorbed by the snow while retaining a sufficient amount of heat, and the snow melts rapidly. In addition, the amount of melted water that has increased with the melting of the snow joins each stage to form a large amount of fast flow, forming a tunnel under the snow layer with low-temperature water, passing wastefully under the snow, There is no drainage as it is. Most of the input heat can be used for melting snow. In addition, since the operation is performed for each stage, there is an advantage that the hot spring capacity of the boiler facility and the pumping capacity of the well can be reduced to a single-stage watering scale.

  The purpose of melting the snow layer quickly with a little hot water and dissipating it was realized under a simple operating procedure.

FIG. 1 shows a snow cover state on the inclined snow cover surface 10. It is preferable that the inclined snow cover 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 applying a friction paint containing particles such as blackboard paint on the surface, but can also be reproduced by applying a sheet-like material.
Examples of the sheet include those described in JP-A-8-184216 (Japanese Patent Application No. 6-339265) by the same applicant as the present application. The sheet is made of woven fabric using spun yarn, and the snow on the surface is difficult to slip. In addition, it regulates the behavior of a small amount of hot water flowing down, disperses the flow, spreads it uniformly, and has an efficient heat exchange performance that contacts the snow layer.

A plurality of water sprinkling means A 1, A 2, A 3 are arranged on the inclined snow surface 10 at intervals in the vertical direction. Using these watering means, warm water is sprayed on the inclined snow cover.
The inclined snow surface is about 60 square meters, and the snow melting surface of each watering means is about 20 square meters. The boiler used 40,000 kilocalories.

  In the example shown in FIGS. 1 to 4, the new snow layer on the snow cover surface is approximately 30 cm thick, and is in an outside temperature minus 2 degrees Celsius after 5 hours have passed since snowfall. The upper and lower arrangement intervals of the watering means are about 4 meters, and the inclined snow cover has a 5 inch gradient. The snow quality was wet, the specific gravity was generally 0.05 to 0.07, the watering temperature by the watering means was 30 degrees Celsius, and the watering amount was 0.8 liter per square meter. The sprinkled hot water is returned to the water storage tank by the recovery means and reused.

  First, watering of warm water is started using the lower watering means A1 alone. The watering temperature should be at least 7 degrees Celsius. If there is enough time, the hot water temperature can be selected according to the outside air temperature and the amount of solar radiation. The absolute value of the outside temperature plus 5 degrees can be selected as a guideline for the minimum practical temperature. For example, if the outside air temperature is minus 5 degrees Celsius, the watering temperature is preferably set to 10 degrees Celsius or more, and if the outside temperature is minus 20 degrees Celsius, it is preferably set to 25 degrees Celsius or more. Therefore, the above-mentioned 30 degrees Celsius is a temperature zone used during snowfall or during rapid snowmelt after snowfall.

  FIG. 2 shows a state after about 5 minutes have elapsed since the start of watering from the watering means A1. The snow layer disappears rapidly. A slight amount of residual snow (I) is observed in the snow melting area that has been processed downstream of the sprinkling means a1. The remaining snow is the remaining snow caused by a fault on the snow surface or the remaining snow caused by driving during snowfall. At this time, watering of the watering means A1 is stopped.

Next, the operation is shifted to the watering operation from the watering means A2 located above the watering means. As shown in FIG. 3, the hot water sprayed from the sprinkling means A2 melts the snow in the area between the lower sprinkling means A1. The snowmelt flow sewage generated by the watering operation passes through the processed snowmelting area downstream of the lower watering means A1, and is effectively utilized for cleaning the remaining snow (b). The watering time required for this is about 5 minutes. Similarly, the watering from the watering means A2 is stopped, and the operation is further shifted to the watering operation from the watering means A3 in the upper stage. The hot water sprayed from the sprinkling means A3 melts the snow between the lower sprinkling means A2 and the snowmelt flowing sewage generated by the sprinkling operation is divided into two treated snow melting areas downstream from the lower sprinkling means A2. It is used effectively for passing snow and cleaning remaining snow. FIG. 4 shows this state. The watering time required for this is also about 5 minutes. Finally, the total watering time by the three-stage watering means was about 15 minutes, and the consumed kerosene was about 1.4 liters.
Thereafter, in accordance with the number of stages, the watering snow melting operation with the lower watering means and the remaining snow in the processed snow melting area on the downstream side are sequentially cleaned using the upper watering means.

  In addition to the watering means A1, A2, and A3 described above, A4, A5, and A6 are installed on the inclined snow surface 10 shown in FIG. These six watering means are in charge of the snow melting area A of 120 square meters. In addition, there are B, C, D and E snow melting regions, and water spraying means are arranged in multiple stages in the same manner in each snow melting region. The area of the watering means is 120 square meters in each area, and the total of five snow melting areas is 600 square meters. The entire surface of the inclined snow cover can be melted with one boiler of 40,000 kilocalories for home use. The operation procedure required for this is the same as that described above.

  If the inclined snow cover surface is a roof, the forms thereof are various. Therefore, a plurality of snow melting regions are arranged in an arbitrary positional relationship. The watering operation performed in each snow melting region is performed with a time difference between the snow melting regions in the range of the amount of hot water discharged from the boiler or the amount of pumped water in the well, and proceeds in order from the snow melting region A to E.

In the example shown in FIG. 5, hot water is supplied from the hot water supply main 20. The hot water supply main pipe 20 has five branch pipes, each provided with an on-off valve 20a, 20b, 20c, 20d, 20e. Hot water is supplied to the snow melting regions A to E by selective operation of these on-off valves. In the snow melting region A, the on / off valves a1, a2, a3, a4, a5, and a6 are interposed at the connecting portion between the branch pipe and the watering means, and selective watering is performed from the lower stage to the upper stage as described above.
The diameter of the hot water piping system is 32 mm for the hot water supply main, 20 mm for the branch pipe, and 40 mm for the header pipe of the watering means. When solenoid valves are used as on-off valves, all of them should be 6/8 size. Since these sizes are mass-produced, they are inexpensive.

  Long sloping surfaces can be processed regardless of the number of sprinkling means, so one large boiler for commercial use in the hundreds of thousands of kilometres can be used as a factory, station building, public facility, etc. It can be applied to railroad floors and road surfaces that extend over several kilometers as well as a lengthy roof.

  It is explanatory drawing which shows the snow cover state on an inclined surface.   It is explanatory drawing of the first operation step of the snow melting method by this invention.   It is explanatory drawing of the subsequent operation step by the same method.   It is explanatory drawing of the last operation stage by the same method.   It is a perspective view which shows an example of the installation form of a watering means on an inclined snow cover, and a piping system.

Explanation of sign

A, B, C, D, E Snow melting area A1, A2, A3, A4, A5, A6 Sprinkling means a1, a2, a3, a4, a5, a6 On-off valve 20 Hot water supply main 20a, 20b, 20c, 20d, 20e On-off valve

Claims (7)

  Multiple steps of water spraying means are arranged on the sloped snow surface at intervals above and below, and after the snow has accumulated on the roof, warm water is sprinkled using the lower watering means, with priority given to the snow on the downstream side. Then, move to the watering operation from the watering means above the watering means, stop the watering at the lower stage, melt the snow between the watering means at the lower stage, and accompany this watering operation The remaining snowmelt is passed through the treated snowmelt area downstream of the lower watering means and the remaining snow is cleaned, and then the upper watering means is used in sequence with the lower watering means according to the number of stages. In the water spray snow melting method for performing the water spray snow melting operation and cleaning the remaining snow in the processed snow melt area on the downstream side, the inclined snow surface provided with a plurality of stages of water spray means forms one snow melt region, and these snow melt regions are a plurality of snow melt regions. Things are arbitrary It is arranged in engagement, sprinkling snow melting method watering operations performed in each of the snow melting region performed with a time difference in melting snow areas mutually.   The water spray snow melting method according to claim 1, wherein a sheet for stopping slipping of accumulated snow is attached to the inclined snow surface.   The sprinkling snow melting method according to claim 1, wherein the inclined snow surface has a property of stopping slipping of accumulated snow and has a normal flow lowering surface that allows the sprinkled warm water to flow evenly.   The water spray snow melting method according to claim 1, wherein a water temperature of hot water sprayed from the water spray means is adjusted according to an outside air temperature.   2. The water spray snow melting method according to claim 1, wherein the snow melt flowing sewage is returned to a water storage tank by a recovery means and reused for water spraying.   The sprinkling snow melting method according to claim 1, wherein the remaining snow is a partial remaining snow generated along with the sprinkling snow melting.   The sprinkling snow melting method according to claim 1, wherein the remaining snow is remaining snow generated by snowfall during sprinkling snow melting.

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