Clog-cleaning tool for snow melting nozzles and method for clearing clogs in snow melting nozzles

Abstract

The objective is to provide a snow-melting nozzle clogging improvement tool and method that have a simple structure, exhibit excellent performance in improving clogging, and offer excellent workability. [Solution] A snow melting nozzle clogging improvement tool for improving clogging of water spray holes 21 formed in a snow melting nozzle 20 embedded in the road surface, the tool having a contact portion 1 that comes into contact with the water spray hole forming surface 20a of the snow melting nozzle 20, the contact portion 1 being configured to generate impact or vibration, and the contact portion 1 being made of an elastic material, the tool being configured to improve clogging of the water spray holes 21 by bringing the contact portion 1 into contact with the water spray hole forming surface 20a of the snow melting nozzle 20 and continuously applying impact or vibration.

Description

Technical Field

[0001] The present invention relates to a clogging improver for a snow melting nozzle and a method for improving clogging of a snow melting nozzle.

Background Art

[0002] In areas with heavy snowfall, snow melting pipes are installed to melt snow on many roads, sidewalks, parking lots, etc. However, since this snow melting pipe is only used during the snowfall period, the non-use period is long, and during this period, sand, mud, dust, etc. may enter the nozzle holes, or rust may occur in the nozzle holes due to iron contained in groundwater, resulting in clogging of the nozzle holes.

[0003] Conventionally, as devices for improving clogging of the nozzle holes of this snow melting pipe, for example, those disclosed in Patent Documents 1 to 5 have been proposed.

[0004] What is disclosed in Patent Document 1 is to inject ultra-high pressure water into the nozzle hole and pulverize the clogging material with this ultra-high pressure water to improve clogging.

[0005] What is disclosed in Patent Document 2 is to insert a cleaning needle into the nozzle hole, rotate this cleaning needle, and pulverize the clogging material to improve clogging.

[0006] What is disclosed in Patent Document 3 is to introduce ultra-high pressure water into the main pipe of the snow melting pipe and push out the clogging material from the inside to improve clogging.

[0007] What is disclosed in Patent Document 4 is to insert a ceramic nozzle into the nozzle hole and pulverize the clogging material with high pressure water ejected from this ceramic nozzle to improve clogging.

[0008] What is disclosed in Patent Document 5 is to insert a striking needle into the nozzle hole, collide a weight with a stopper to generate an impact force, and the striking needle strikes the clogging material with this impact force to pulverize the clogging material and improve clogging. [Prior art documents] [Patent Documents]

[0009] [Patent Document 1] Patent No. 4283685 [Patent Document 2] Japanese Patent Publication No. 2001-226930 [Patent Document 3] Patent No. 2613540 [Patent Document 4] Patent No. 2513171 [Patent Document 5] Utility Model Registration No. 3044685 Gazette [Overview of the Initiative] [Problems that the invention aims to solve]

[0010] However, methods that use ultra-high-pressure water, such as those described in Patent Documents 1 and 3, require a large-scale system to generate the ultra-high-pressure water, and methods that handle processing at each nozzle hole, such as those described in Patent Documents 2, 4, and 5, are time-consuming.

[0011] Furthermore, in methods such as those described in Patent Documents 2 and 5, where a needle-like object is inserted into the nozzle hole to strike or press the blockage, there is a risk of further compressing the blockage and causing it to become even more firmly clogged.

[0012] This invention has been made in view of the current state of the above-mentioned conventional devices, and aims to provide a snow melting nozzle clogging improvement tool and snow melting nozzle clogging improvement method that have a simple configuration, exhibit excellent performance in improving clogging, and have excellent workability. [Means for solving the problem]

[0013] The gist of the present invention will be explained with reference to the attached drawings.

[0014] The present invention relates to a snow-melting nozzle clogging improvement tool that improves clogging of water spray holes 21 formed in a snow-melting nozzle 20 embedded in the road surface, and has a contact portion 1 configured to generate impact or vibration and to come into contact with the water spray hole forming surface 20a of the snow-melting nozzle 20, wherein the clogging of the water spray holes 21 is improved by continuously applying impact or vibration when the contact portion 1 comes into contact with the water spray hole forming surface 20a of the snow-melting nozzle 20.

[0015] Furthermore, the snow-melting nozzle clogging improvement device according to claim 1 is characterized in that the contact portion 1 is connected to an appropriate impact source or vibration source via a connecting member 2.

[0016] Furthermore, the snow-melting nozzle clogging improvement device according to claim 2 is characterized in that the impact source is an impact tool 10 such as an electric hammer or an air hammer, and the vibration source is a vibration generating tool such as an electric sander or a concrete vibrator.

[0017] Furthermore, the present invention relates to a snow-melting nozzle clogging improvement tool according to any one of claims 1 to 3, characterized in that the contact portion 1 has a tip portion 1a that contacts the water spray hole forming surface 20a and is made of an elastic material.

[0018] Furthermore, the snow-melting nozzle clogging improvement device according to claim 4 is characterized in that the elastic body is urethane rubber with a durometer hardness of Shore A70 to Shore A95.

[0019] Furthermore, the present invention relates to a snow-melting nozzle clogging improvement device according to any one of claims 1 to 3, characterized in that the contact portion 1 is provided with a cover body 3 that covers the snow-melting nozzle 20 when the contact portion 1 is brought into contact with the water-spraying hole forming surface 20a of the snow-melting nozzle 20.

[0020] Further, in the clogging improvement tool for a snow melting nozzle according to claim 4, when the contact portion 1 is brought into contact with the water spray hole forming surface 20a of the snow melting nozzle 20, a cover body 3 for covering the snow melting nozzle 20 is provided on the contact portion 1, and the present invention relates to a clogging improvement tool for a snow melting nozzle.

[0021] Further, in the clogging improvement tool for a snow melting nozzle according to claim 5, when the contact portion 1 is brought into contact with the water spray hole forming surface 20a of the snow melting nozzle 20, a cover body 3 for covering the snow melting nozzle 20 is provided on the contact portion 1, and the present invention relates to a clogging improvement tool for a snow melting nozzle.

[0022] Also, a method for improving clogging of a snow melting nozzle for improving clogging of water spray holes 21 formed in a snow melting nozzle 20 buried in a road surface. When clogging has occurred in the water spray holes 21, in a state where snow melting water is ejected from the water spray holes 21 of the snow melting nozzle 20, a contact portion 1 connected to a striking source or a vibration source is brought into contact with the water spray hole forming surface 20a of the snow melting nozzle 20, and the striking source or the vibration source is operated to continuously apply striking or vibration to the water spray hole forming surface 20a by the contact portion 1. By applying this striking or vibration, the clogging in the water spray holes 21 is impact-crushed or vibration-crushed and discharged outside the water spray holes 21 by the ejection pressure of the snow melting water to improve the clogging of the water spray holes 21, and the present invention relates to a method for improving clogging of a snow melting nozzle.

[0023] Further, in the method for improving clogging of a snow melting nozzle according to claim 9, the striking source is a striking tool 10 such as an electric hammer or an air hammer, and the vibration source is a vibration generating tool such as an electric sander or a concrete vibrator, and the present invention relates to a method for improving clogging of a snow melting nozzle.

[0024] Further, in the method for improving clogging of the snow melting nozzle according to claim 9, the contact portion 1 is related to a method for improving clogging of the snow melting nozzle, characterized in that a tip portion 1a for contacting the water spraying holes forming surface 20a is made of an elastic body.

[0025] Further, in the method for improving clogging of the snow melting nozzle according to claim 10, the contact portion 1 is related to a method for improving clogging of the snow melting nozzle, characterized in that a tip portion 1a for contacting the water spraying holes forming surface 20a is made of an elastic body.

[0026] Further, in the method for improving clogging of the snow melting nozzle according to claim 11, the elastic body is related to a method for improving clogging of the snow melting nozzle, characterized in that it is urethane rubber with a durometer hardness of Shore A70 to Shore A95.

[0027] Further, in the method for improving clogging of the snow melting nozzle according to claim 12, the elastic body is related to a method for improving clogging of the snow melting nozzle, characterized in that it is urethane rubber with a durometer hardness of Shore A70 to Shore A95.

[0028] Further, in the method for improving clogging of the snow melting nozzle according to any one of claims 9 to 14, when the contact portion 1 is brought into contact with the water spraying holes forming surface 20a of the snow melting nozzle 20, a cover body 3 for covering the snow melting nozzle 20 is provided on the contact portion 1. The snow melting nozzle 20 is covered from above by this cover body 3, and the snow melting water ejected from the water spraying holes 21 is blocked by this cover body 3 so as not to scatter outside the cover body 3. It is related to a method for improving clogging of the snow melting nozzle.

[0029] Further, in the method for improving clogging of the snow melting nozzle according to any one of claims 9 to 14, the contact portion 1 is brought into contact with the water spraying holes forming surface 20a, and continuous impact is applied thereto from a direction perpendicular to the water spraying holes forming surface 20a for several seconds to several tens of seconds under the following conditions. It is related to a method for improving clogging of the snow melting nozzle. Strike Strike number: 1,500 (times / minute) or more Impact energy (EPTA standard): 7 joules or more

[0030] Furthermore, the method for improving clogging of a snow melting nozzle according to claim 15 is characterized by bringing the contact portion 1 into contact with the water spray hole forming surface 20a, and continuously applying impact to the water spray hole forming surface 20a from a perpendicular direction for several seconds to several tens of seconds under the following conditions. Note Attacks: 1,500 (attacks / minute) or more Impact energy (EPTA standard): 7 joules or more

[0031] Furthermore, the present invention relates to a method for improving clogging of a snow melting nozzle according to any one of claims 9 to 14, characterized in that the contact portion 1 is brought into contact with the water spray hole forming surface 20a, and vibration is continuously applied to the water spray hole forming surface 20a from a direction perpendicular to it for several seconds to several tens of seconds under the following conditions. Note Vibration frequency: 10,000 to 20,000 (times / min)

[0032] Furthermore, the method for improving clogging of a snow melting nozzle according to claim 15 is characterized by bringing the contact portion 1 into contact with the water spray hole forming surface 20a, and applying continuous vibration to the water spray hole forming surface 20a from a direction perpendicular to the following conditions for several seconds to several tens of seconds. Note Vibration frequency: 10,000 to 20,000 (times / min) [Effects of the Invention]

[0033] As described above, the present invention provides a simple configuration that exhibits excellent performance in improving clogging, and moreover, a clogging improvement tool and method for snow melting nozzles that offer excellent workability. [Brief explanation of the drawing]

[0034] [Figure 1] This is an explanatory front view illustrating this embodiment. [Figure 2] This is an explanatory cross-sectional view showing the main part of this embodiment. [Figure 3] This is an exploded perspective view showing the main parts of this embodiment. [Figure 4] This is an explanatory diagram showing the state in which the contact portion is in contact with the water spray hole forming surface of the snow melting nozzle in the snow melting nozzle method for improving clogging of the snow melting nozzle according to this embodiment. [Figure 5] This photograph shows a method for improving clogging in the snow-melting nozzle in this embodiment. [Figure 6] This is an explanatory diagram showing the worker's posture in the snow-melting nozzle clogging improvement method of this embodiment. [Modes for carrying out the invention]

[0035] A preferred embodiment of the present invention will be briefly described with reference to the drawings, illustrating the operation of the present invention.

[0036] The contact part 1 is brought into contact with the sprinkler hole forming surface 20a of the snow melting nozzle 20, where the sprinkler holes 21 are clogged, while the snow melting pipe is in operation (with snow melting water being ejected from the sprinkler holes 21 formed in the snow melting nozzle 20), and the contact part 1 continuously applies impact or vibration to the snow melting nozzle 20.

[0037] The continuous impact or vibration applied to the snow-melting nozzle 20 by the contact portion 1 transmits the impact or vibration to the blockage in the clogged water spray hole 21, causing the blockage to be crushed by impact or vibration. The crushed blockage is then pressed by the snow-melting water flowing into the water spray hole 21 and discharged outside the water spray hole 21 along with the snow-melting water, thereby improving or eliminating the blockage in the water spray hole 21.

[0038] Thus, the present invention applies continuous impact or vibration to the snow-melting nozzle 20, crushing the blockage in the water spray holes 21 by the impact or vibration, and then discharging the crushed blockage outside the water spray holes 21 by the pressure of the snow-melting water. As a result, the work can be performed easily and quickly. Furthermore, even if multiple water spray holes 21 are clogged in a single snow-melting nozzle 20, the clogging of all clogged water spray holes 21 can be improved or resolved in a single operation. In this respect as well, it is a groundbreaking snow-melting nozzle clogging improvement tool and snow-melting nozzle clogging improvement method that is superior in workability compared to conventional methods. [Examples]

[0039] Specific embodiments of the present invention will be described with reference to the drawings.

[0040] This embodiment is a snow-melting nozzle clogging improvement tool that improves clogging of water spray holes 21 formed in a snow-melting nozzle 20 embedded in the road surface.

[0041] Specifically, this embodiment has a contact portion 1 that comes into contact with the water spray hole forming surface 20a of the snow melting nozzle 20, and this contact portion 1 is configured to generate impact, and by bringing this contact portion 1 into contact with the water spray hole forming surface 20a of the snow melting nozzle 20 and continuously applying impact, the clogging of the water spray holes 21 is improved.

[0042] The components of this embodiment will be described in detail below.

[0043] As shown in Figure 1, this embodiment consists of a contact part 1 that contacts the water spray hole forming surface 20a of the snow melting nozzle 20 and continuously applies impact to the snow melting nozzle 20, an impact tool 10 that generates impact on the contact part 1, a connecting member 2 that connects the contact part 1 and the impact tool 10, and a cover body 3 that prevents snow melting water from splashing towards the worker's feet during operation.

[0044] As shown in Figure 2, the contact portion 1 is provided at the tip of the connecting member 2, and the tip portion 1a that contacts the water spray hole forming surface 20a of the snow melting nozzle 20 is made of an elastic material.

[0045] Specifically, the tip portion 1a is formed in a cylindrical shape as shown in Figure 3 and is detachably attached to the fitting portion 1b provided on the contact portion 1.

[0046] More specifically, the tip portion 1a is made of urethane rubber with a durometer hardness of Shore A70 to Shore A95, and the contact portion 1 of this embodiment is equipped with three types of tip portions 1a with different hardnesses of Shore A70, Shore A90, and Shore A95, and is configured so that a tip portion 1a of the appropriate hardness can be selected and attached.

[0047] The material and hardness of the tip portion 1a are not limited to those described above, and any material or hardness that can achieve the effects of this embodiment can be used as appropriate.

[0048] Furthermore, the connecting member 2, which has the aforementioned contact portion 1 at its tip, is made of a metal rod-shaped body, and as shown in Figures 2 and 3, a shank portion 2a that can be connected to the striking tool 10 is provided at its base end.

[0049] Specifically, the connecting member 2 is configured to have a length of 350mm to 450mm, and its length including the contact portion 1 is 500mm to 600mm.

[0050] In this embodiment, the connecting member 2 is configured to be set to the predetermined length described above. However, the connecting member 2 may also be configured to be adjustable in length, so that both short and tall workers can adjust it to an appropriate length according to their height, allowing them to work without bending over.

[0051] Furthermore, the cover body 3 is made of water-resistant rubber or synthetic resin, and as shown in Figure 2, it is formed in an umbrella shape, with an insertion engagement portion 3a at its base end into which the connecting member 2 is inserted and engages. The cover body 3 is fitted in from the base end side of the connecting member 2, and is provided on the tip side of the connecting member 2 by a retaining member (not shown) so as to completely cover the entire contact portion 1.

[0052] In this embodiment, the cover body 3 is made of a general rubber material, but for example, a transparent or translucent material may be used to make the inside of the cover body 3 visible, so that the position of the contact portion 1 (the tip portion 1a of the contact portion 1) relative to the snow melting nozzle 20 and the state of improvement in the clogging of the water spray holes 21 can be checked during operation.

[0053] Furthermore, the material and shape of the cover 3 are not limited to this embodiment, as long as it serves to prevent snowmelt water from splashing towards the worker's feet during operation. Also, in this embodiment, the absence of the cover 3 does not affect the clogging improvement function, so a configuration without the cover 3 is also acceptable.

[0054] Furthermore, the striking tool 10 is a commercially available electric hammer with an appropriate number of blows (striking speed) and striking energy (striking force).

[0055] Specifically, an electric hammer with a strike rate of 1,500 (strokes / minute) or more and an impact energy (EPTA standard) of 7 (joules) or more is suitable, such as Makita's electric hammer model No. HM0871C or Makita's cordless hammer model No. HM001GRMX (using a cordless hammer allows for cordless operation, eliminating the need for a power source and improving portability, thus improving work efficiency).

[0056] The striking tool 10 is not limited to an electric hammer; any tool capable of performing a similar striking action on the contact portion 1 can be used as appropriate (for example, an electric hammer drill or an air hammer).

[0057] Furthermore, although this embodiment is configured to apply impact to the snow-melting nozzle 20 as described above, a vibration generating device such as an electric sander or concrete vibrator may be used instead of the impact tool 10, and vibration may be applied to the snow-melting nozzle 20 instead of impact.

[0058] In this case, the vibration generating device is preferably one that can apply vibrations to the snow melting nozzle 20 at a frequency of 10,000 to 20,000 times per minute.

[0059] Next, a method for improving clogging of snow-melting nozzles using this embodiment will be described.

[0060] First, with snow-melting water being sprayed from the water-spraying holes 21 of the snow-melting nozzle 20, the tip 1a of the contact part 1 is brought into contact with the water-spraying hole forming surface 20a of the snow-melting nozzle 20 where the water-spraying holes 21 are clogged, as shown in Figure 4.

[0061] In this case, the contact portion 1 (the tip portion 1a of the contact portion 1) is brought into contact with the water spray hole forming surface 20a from directly above so that the contact portion 1 strikes the water spray hole forming surface 20a from a vertical direction.

[0062] With the tip 1a of the contact part 1 in contact with the water-spraying hole forming surface 20a, the striking tool 10 (electric hammer) is activated to continuously strike the water-spraying hole forming surface 20a with the contact part 1.

[0063] Specifically, if there are one or two clogged water spray holes 21 in a single snow-melting nozzle 20, the number of impacts (impact speed) of the impact tool 10 is set to 1,500 (impacts / minute) or more (2,000 to 2,500 impacts / minute in this embodiment), the impact time per impact is set to a few seconds (around 5 seconds), and the work is performed while checking the degree of improvement (resolution) of the clogging.

[0064] Furthermore, if all the water holes 21 in a single snow-melting nozzle 20 are clogged, the striking time per stroke is increased (to about 10-30 seconds), and the work is carried out while checking the degree to which the clogging is being improved (resolved).

[0065] In any of the above cases, if the clogging is not improved (resolved) after several blows, replace the contact part 1 with a harder one, or increase the number of blows by setting the number of blows on the blowing tool 10 to increase the strength, and then perform the work again.

[0066] The applicant has actually performed work using this embodiment, in which a Makita electric hammer, model No. HM0871C, is used as the striking tool 10, and has confirmed that the clogging of the water sprinkler holes 21 is effectively improved and resolved. In this case, as shown in Figure 5, a single strike of about 3 seconds was performed on a snow melting nozzle 20 in which all six water sprinkler holes 21 were clogged, and the clogging of three of the water sprinkler holes 21 was resolved.

[0067] Thus, the snow-melting nozzle clogging improvement method using this embodiment is an extremely simple operation in which the contact part 1, connected to the striking tool 10 via a connecting member 2, continuously strikes the water-spraying hole forming surface 20a of the snow-melting nozzle 20. This striking action breaks up any blockages in the water-spraying holes 21, and the pressure of the snow-melting water ejection expels the blockages to the outside of the water-spraying holes 21, thereby improving or eliminating the clogging of the water-spraying holes 21. This is a groundbreaking and unprecedented method for improving the clogging of snow-melting nozzles.

[0068] Furthermore, in this embodiment used for the method of improving clogging of the snow melting nozzle described above, the tip 1a of the contact part 1 that strikes the snow melting nozzle 20 is made of urethane rubber. Therefore, the striking will not damage the water spray hole forming surface 20a of the snow melting nozzle 20 or damage the snow melting nozzle 20, so the work can be carried out with peace of mind.

[0069] Furthermore, in this embodiment, the tip 1a of the contact portion 1 is detachably replaceable, so the work can be performed by replacing the tip 1a with one of appropriate hardness depending on the degree of clogging (improvement).

[0070] Furthermore, the connecting member 2 in this embodiment is configured to have a length of 350 mm to 450 mm, and a length including the contact portion 1 of 500 mm to 600 mm. As shown in Figure 6, this allows the worker to perform the work in a comfortable posture without having to bend over.

[0071] Furthermore, in this embodiment, a cover body 3 is provided on the tip side, and this cover body 3 is configured to cover the snow melting nozzle 20 when the contact portion 1 is brought into contact with the water spray hole forming surface 20a of the snow melting nozzle 20. As shown in Figure 4, when the contact portion 1 is brought into contact with the water spray hole forming surface 20a of the snow melting nozzle 20 during operation, this cover body 3 covers the snow melting nozzle 20 from above, blocking the snow melting water ejected from the water spray holes 21, preventing it from splashing outside the cover body 3. As a result, the snow melting water ejected from the water spray holes 21 does not get on the worker's feet, and even if the clogging is cleared and snow melting water is suddenly ejected forcefully from the water spray holes 21, it is prevented from getting on the worker's feet.

[0072] It should be noted that the present invention is not limited to this embodiment, and the specific configuration of each constituent element can be designed as appropriate. [Explanation of Symbols]

[0073] 1 Contact part 1a Tip 2 Connecting members 3 Cover body 10 striking tools 20 Snow melting nozzles 20a Surface for forming water spray holes 21 Sprinkler holes

Claims

1. A snow-melting nozzle clogging improvement tool for improving clogging of water spray holes formed in a snow-melting nozzle embedded in the road surface, comprising a contact portion configured to generate impact or vibration and to be in contact with the water spray hole forming surface of the snow-melting nozzle, wherein the clogging of the water spray holes is improved by bringing the contact portion into contact with the water spray hole forming surface of the snow-melting nozzle and continuously applying impact or vibration.

2. A snow-melting nozzle clogging improvement device according to claim 1, characterized in that the contact portion is connected to an appropriate impact source or vibration source via a connecting member.

3. The snow-melting nozzle clogging improvement device according to claim 2, characterized in that the impact source is an impact tool such as an electric hammer or an air hammer, and the vibration source is a vibration generating tool such as an electric sander or a concrete vibrator.

4. A snow-melting nozzle clogging improvement tool according to any one of claims 1 to 3, characterized in that the contact portion has a tip that contacts the water spray hole forming surface made of an elastic material.

5. The snow-melting nozzle clogging improvement tool according to claim 4, characterized in that the elastic body is a urethane rubber with a durometer hardness of Shore A70 to Shore A95.

6. A snow-melting nozzle clogging improvement tool according to any one of claims 1 to 3, characterized in that the contact portion is provided with a cover body that covers the snow-melting nozzle when the contact portion is brought into contact with the water-spraying hole forming surface of the snow-melting nozzle.

7. A snow-melting nozzle clogging improvement tool according to claim 4, characterized in that the contact portion is provided with a cover body that covers the snow-melting nozzle when the contact portion is brought into contact with the water-spraying hole forming surface of the snow-melting nozzle.

8. The snow-melting nozzle clogging improvement tool according to claim 5, characterized in that the contact portion is provided with a cover body that covers the snow-melting nozzle when the contact portion is brought into contact with the water-spraying hole forming surface of the snow-melting nozzle.

9. A method for improving clogging of a snow melting nozzle embedded in a road surface, the method comprising: bringing a contact part connected to an impact source or a vibration source into contact with the surface of the water sprinkler hole of a snow melting nozzle where clogging has occurred, while snow melting water is being ejected from the water sprinkler hole of the snow melting nozzle; activating the impact source or the vibration source to continuously apply impact or vibration to the surface of the water sprinkler hole with the contact part; thereby crushing the blockage in the water sprinkler hole by impact or vibration and discharging it out of the water sprinkler hole with the ejection pressure of the snow melting water, thereby improving the clogging of the water sprinkler hole.

10. A method for improving clogging of a snow melting nozzle according to claim 9, characterized in that the impact source is an impact tool such as an electric hammer or an air hammer, and the vibration source is a vibration generating tool such as an electric sander or a concrete vibrator.

11. A method for improving clogging of a snow melting nozzle according to claim 9, characterized in that the contact portion has a tip that contacts the water spray hole forming surface made of an elastic material.

12. A method for improving clogging of a snow melting nozzle according to claim 10, characterized in that the contact portion has a tip that contacts the water spray hole forming surface and is made of an elastic material.

13. A method for improving clogging of a snow melting nozzle according to claim 11, characterized in that the elastic body is a urethane rubber with a durometer hardness of Shore A70 to Shore A95.

14. A method for improving clogging of a snow melting nozzle according to claim 12, characterized in that the elastic body is a urethane rubber with a durometer hardness of Shore A70 to Shore A95.

15. A method for improving clogging of a snow melting nozzle according to any one of claims 9 to 14, wherein the contact portion is provided with a cover body that covers the snow melting nozzle when the contact portion is brought into contact with the water spray hole forming surface of the snow melting nozzle, and the snow melting nozzle is covered from above with this cover body, blocking the snow melting water ejected from the water spray holes and preventing it from scattering outside the cover body.

16. A method for improving clogging of a snow melting nozzle according to any one of claims 9 to 14, characterized in that the contact portion is brought into contact with the water spray hole forming surface, and a continuous impact is applied to the water spray hole forming surface from a direction perpendicular to it for several seconds to several tens of seconds under the following conditions. Note Hits per minute: 1,500 or more Impact energy (EPTA standard): 7 (joules) or more

17. A method for improving clogging of a snow melting nozzle according to claim 15, characterized in that the contact portion is brought into contact with the water spray hole forming surface, and a continuous impact is applied to the water spray hole forming surface from a direction perpendicular to it for several seconds to several tens of seconds under the following conditions. Note Hits per minute: 1,500 or more Impact energy (EPTA standard): 7 (joules) or more

18. A method for improving clogging of a snow melting nozzle according to any one of claims 9 to 14, characterized in that the contact portion is brought into contact with the water spray hole forming surface, and vibration is continuously applied to the water spray hole forming surface from a direction perpendicular to the water spray hole forming surface for several seconds to several tens of seconds under the following conditions. Note Vibration frequency: 10,000 to 20,000 (times / min)

19. A method for improving clogging of a snow melting nozzle according to claim 15, characterized in that the contact portion is brought into contact with the water spray hole forming surface, and vibration is continuously applied to the water spray hole forming surface from a direction perpendicular to the water spray hole forming surface for several seconds to several tens of seconds under the following conditions. Note Vibration frequency: 10,000 to 20,000 (times / min)

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