JP2975976B2 - How to prevent snow from rolling - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing snow from rolling, and more particularly, to a method for preventing snow from rolling at the eaves of a snow-covered roof or at a high step beside a passage. About.

[0002]

2. Description of the Related Art As is well known, various phenomena occur in a snow layer on a roof in a snowy area depending on environmental conditions such as temperature, humidity, solar radiation, and wind speed. A phenomenon referred to as curling may occur. As shown in FIG. 9, this undulation is accompanied by icicles B1 generated at the tip of the eaves tip A1 without the snow layer B on the top of the roof A of the building being cut off at the tip.
This is a phenomenon of being bent so as to be wound toward the vertical wall surface A2 of the building. Such a phenomenon occurs not only in a building having a sloped roof A as shown in the figure, but also in a building having a flat roof. On the other hand, in a residential area plan, etc., an approach that is a mounting passage from a residential road to the entrance of each house or a kitchen may be installed, and a step higher than the passage is provided beside the passage such as this approach. Although it may be formed, even when a snow layer is formed on the upper surface of the high step portion, the same roll-up may occur as described above. In detail, FIG.
As shown in FIG. 0, the snow layer H formed on the upper surface of the step portion G existing on the side of the passage F is bent so as to be rolled inward without cutting off at the side edge G1 of the step portion G. Things.

[0003]

When the snow layer of the roof A rolls over as shown in FIG. 9, the eaves are broken, the gutter falls, the vertical wall is broken, the glass is broken, and the like.
In addition to causing damage such as damage to the shed and injuries such as personal injury, as shown in FIG. This causes so-called leakage E. For this reason, it is essential to prevent the occurrence of the slop in advance in avoiding snow damage in a snowy area. However, under the present circumstances, simple measures such as dropping the rolled portion from below are taken to avoid the above-mentioned adverse effects. This causes a secondary disaster, such as the worker being underneath. Further, even when the snow layer hangs on the step portion G on the side of the passage F as illustrated in FIG. 10, the hang portion falls and directly hits the pedestrian passing through the passage F. And various snow damages such as damage to the passageway F or the like.

[0004] The present invention has been made in view of the above circumstances, and provides an effective method capable of preventing the occurrence of rolling and heavy snowfall in snowy areas without impairing the appearance. An object of the present invention is to avoid various problems caused by dripping and heavy snowfall.

[0005]

Means for Solving the Problems A method for preventing snow from rolling down according to the present invention, which has been made to solve the above technical problems, has the following features. That is, as a first method, the protruding portion of the snow layer protruding outward from the edge of the roof is cut and dropped by irradiating a laser beam to the snow layer above the edge of the roof. Further, as a second method, the protruding portion of the snow layer formed on the side of the passage and protruding outward from the side edge of the step higher than the passage is placed above the side edge of the step. The snow layer is irradiated with a laser beam and cut and dropped.

[0006]

According to the first method, when a snow layer is formed on the upper surface of the roof, the snow layer grows under the influence of its own weight or the influence of the wind, and grows from the edge of the roof. The protruding portion is cut off by a laser beam applied to the snow layer above the edge of the roof and falls early. This is because when the snow layer is irradiated on the snow layer above the edge of the roof as described above,
This is based on the theory that a shearing force is generated on the irradiation surface of the laser beam, and the protruding portion is cut and dropped due to the shearing force. Therefore, the roll-up of the snow layer disappears at the initial stage of its occurrence. According to the second method, when the snow layer is formed on the upper surface of the high step portion on the side of the passage, the snow layer protrudes outward from the side edge of the step portion in the same manner as described above. However, also in this case, the protruding portion falls early due to the action of the laser beam, and the snow layer does not grow until the roll-up occurs.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. First, a roof structure which is a first example used in carrying out the method according to the present invention will be described. As shown in FIG. 1, a pair of upright columns 3, 4 are attached at intervals above the eave tip 2 a on the roof 2 of the building 1. One of the uprights 3 is provided with a light projecting unit for projecting a plurality of laser beams 5─5 at a predetermined pitch in the vertical direction, and the other upright support 4 is provided with the laser beam A light receiving unit for receiving 5─5 is provided. The projection of the laser beams 5─5 is controlled by a control unit (not shown).

On the other hand, the above-mentioned roof structure will be described in detail. As shown in FIG. 2, a field board 8 is stretched over a roof frame member (main building) 7 # 7 fixed to the climbing beam 6. At the same time, an asphalt roofing 9 is stretched above the base plate 8, and a roofing material 11 ─ 11 made of a tile or a color vest is laid above the asphalt roofing 9. The mounting structure of the upright support column 4 is not particularly limited, but has, for example, the following structure.

That is, the upright support 4 is attached to the overlapping portion of the roofing materials 11, 11 which are vertically adjacent to each other at the eave tip 2a of the roof 2.
The extension portion 4a connected to the lower end of the base is inserted, and the extension portion 4a of the upright support 4 and the roofing material 11 are integrally fastened to the base plate 8 using fastening members 12, 12 such as nails. It was made. In this way, not only can the standing pillar 4 be securely fixed using the existing fastening members 12, 12 for fastening the roofing material 11, but also appearance and appearance without inconvenience such as water leakage can be achieved. Can be avoided.

Next, a method for preventing snow from rolling down according to the present invention will be described based on the roof structure shown in FIGS.
When a snow layer is formed on the upper surface of the roof 2, the snow layer grows along the upper surface of the roof 2 with the passage of time under the influence of its own weight, wind, and the like. And FIG.
As shown in the figure, the snow layer X protrudes outward from the place where the upright supports 3 and 4 are provided. In this case, the irradiation position of the laser beam 5─5 is determined by the weight of the protruding portion X1 of the snow layer X. A shear force is generated at the portion indicated by the imaginary line Z, and as a result, the protruding portion X1 falls downward as shown in FIG. This is because the characteristics of the snow layer X do not have sufficient strength against the shearing force, and mainly due to the characteristics that snow is soft and brittle. Therefore, even if the snow layer X attempts to grow outward from the irradiation position of the laser beam 5─5, there is a limit to this growth, and when the slight protruding portion X1 is generated, the laser beam 5─5 is cut. The protruding portion X1 falls by the action, and does not grow until the occurrence of the curling as shown in FIG. 9 described above.
Although the above embodiment describes the case where the method of the present invention is applied to a gable roof, the method of the present invention can be similarly applied to a ridge roof and a flat roof. Preferably, the entire periphery of the roof is irradiated with a laser beam.

Further, as shown in FIG. 4, the laser beam 5-5 may be irradiated only above the entrance 1a, which is a place where the frequency of traffic is high, or above the access opening. In this case, there is an advantage that snowfall to approach 1b is reduced.

Further, as shown in FIG. 5, for example, only the valley 2x of the roof 2 where the snow layer easily accumulates is irradiated with the laser beams 5 # 5 to prevent a large amount of snow falling from the valley 2x. You may do so.

Next, a description will be given of a structure of a passage portion which is a second example used in carrying out the method according to the present invention. As shown in FIG. 6, a passage 21 having an outer staircase 21a
A step portion 22 higher than the passage 21 is formed at the side of the step 21. Three upright columns 23, 24, 25 in the illustrated example are attached to side edges 22a of the step portion 22. . And
The upright support 24 located in the middle is provided with a light projecting portion for projecting the laser beam 5 # 5 in two orthogonal directions, and the upright support 23, 25 located on both sides is provided with the laser beam 5 #. 5 is provided with a light receiving section for receiving light

[0014] The use of such a structure prevents the occurrence of curling as described below. That is, as shown in FIG. 7, the snow layer X formed on the upper surface of the step portion 22 grows in the horizontal direction under the influence of its own weight, the influence of the wind, and the like, and the location where the upright supports 24 and 25 are disposed. The laser beam 5─5 is applied to the snow layer X, and the portion indicated by the imaginary line Z, which is the irradiation position, has its own weight of the protruding portion X1 of the snow layer X. As a result, a shearing force is generated, and as a result, the protruding portion X1 falls downward as shown in FIG. Therefore, when the snow layer X slightly protrudes outward from the irradiation position of the laser beam 5─5, the snow layer X is cut and dropped, and it is impossible to grow until the occurrence of the curling as shown in FIG. 10 described above. Disappears.

[0013]

The method for preventing snow from rolling according to the present invention comprises:
The configuration described above has the following effects. That is, according to the method for preventing snow from rolling down according to claim 1, when the snow layer formed on the top surface of the roof grows and slightly protrudes outward from the roof edge, the laser beam acts. The protruding portion is cut and dropped, and the protruding portion is prevented from growing to the occurrence of undulation. As a result, harmful effects such as breakage near the eaves, personal injury, and further leakage due to the occurrence of undulation are prevented. Is avoided and a large amount of snowfall does not occur. In addition, since a laser beam is used as a means for cutting the protruding portion of the snow layer, it is not necessary to separately add a component that impairs the appearance, thereby improving the appearance. On the other hand, according to the method for preventing snow from rolling, the protruding portion of the snow layer formed on the upper surface of the step on the side of the passage is cut by the laser beam and falls early, so Injuries such as dripping and dropping of the rolled part onto a pedestrian can be prevented beforehand, safety of the passage can be ensured, and in this case, the appearance can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a roof structure used in carrying out the method of the present invention.

FIG. 2 is an enlarged vertical sectional front view of a main part for explaining the method of the present invention.

FIG. 3 is an enlarged vertical sectional front view of a main part for explaining the method of the present invention.

FIG. 4 is a perspective view showing a roof structure used in carrying out the method of the present invention.

FIG. 5 is a perspective view showing a roof structure used in carrying out the method of the present invention.

FIG. 6 is a perspective view showing a structure of a passage portion used in carrying out the method of the present invention.

FIG. 7 is an enlarged vertical sectional front view of a main part for explaining the method of the present invention.

FIG. 8 is an enlarged vertical sectional front view of a main part for explaining the method of the present invention.

FIG. 9 is an enlarged vertical sectional front view of a main part showing a conventional problem.

FIG. 10 is an enlarged vertical sectional front view of a main part showing a conventional problem.

[Explanation of symbols]

 2 Roof 2a Roof edge 5 Laser beam 21 Passage 22 Step X Snow layer X1 Overhang

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E04H 9/16

Claims (2)

(57) [Claims] 1. A snow roll wherein a protruding portion of a snow layer protruding outward from an edge of a roof is cut and dropped by irradiating a laser beam to the snow layer above an edge of the roof. How to prevent dripping. 2. A protruding portion of a snow layer formed on a side of a passage and protruding outward from a side edge of a step portion higher than the passage, and a laser beam is applied to the snow layer above the side edge of the step portion. A method for preventing snow from rolling down, comprising irradiating with water and cutting and falling.